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Применить Всего найдено 6529. Отображено 200.
10-07-1997 дата публикации

ПНЕВМОГИДРАВЛИЧЕСКИЙ ПРИВОД ВОЗВРАТНО-ПОСТУПАТЕЛЬНОГО ДВИЖЕНИЯ

Номер: RU2083882C1

Использование: в машиностроении. Сущность изобретения: в пневмогидравлическом приводе возвратно-поступательного движения, содержащем приводной пневматический и тормозные гидравлические цилиндры, корпуса которых прикреплены к основанию, а штоки жестко соединены между собою, пневматический распределитель, соединенный пневмолиниями с источником сжатого воздуха и с полостями пневматического цилиндра, и регулирующий гидравлический аппарат, установленный в гидролинии, сообщающей противоположные полости тормозных гидроцилиндров, одноименные полости которых также соединены между собою, дополнительно снабжен направляющими аппаратами, установленными на входе и на выходе из регулирующего гидравлического аппарата. Кроме того, пневмогидравлический привод снабжен масляным резервуаром и обратным клапаном, подключенным к гидролинии, в которой установлены направляющие и регулирующие аппараты. 1 з.п. ф-лы, 1 ил.

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10-08-2009 дата публикации

ГИДРОЦИЛИНДР С ОСЕВЫМ ПИТАНИЕМ ШТОКОВОЙ ПОЛОСТИ

Номер: RU2008102624A
Принадлежит:

Силовой гидроцилиндр, состоящий из гильзы с дном и крышкой, поршнем со штоком, каналами подвода и отвода рабочей жидкости в поршневую и штоковую полости, расположенные в дне, при этом подвод рабочей жидкости в штоковую полость осуществляется через неподвижный трубопровод, соединенный с каналом в дне, отличающийся тем, что подвод рабочей жидкости в штоковую полость осуществляется через неподвижный трубопровод, закрепленный в дне по оси штока, внутренняя полость которого выполнена диаметром больше наружного диаметра неподвижного трубопровода и соединена со штоковой полостью гидроцилиндра отверстиями, расположенными непосредственно у торца поршня со стороны штоковой полости; или проходящего через отверстие в поршне, при этом посадка неподвижного трубопровода относительно внутреннего отверстия штока или отверстия в поршне выполнена герметичной с помощью уплотнений.

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22-06-2022 дата публикации

РЕГУЛЯТОР РАСХОДА И ПРИВОДНОЕ УСТРОЙСТВО, ВКЛЮЧАЮЩЕЕ В СЕБЯ ЭТОТ РЕГУЛЯТОР РАСХОДА

Номер: RU2772266C9
Принадлежит: СМСи КОРПОРЕЙШН (JP)

Изобретение может быть использовано в устройствах, использующих поток воздуха. Регулятор (12) расхода предназначен для изменения расхода воздуха, подаваемого или выпускаемого через по меньшей мере один из первого канала (14), сообщающегося с одним портом (104) воздушного цилиндра (100), и второго канала (16), сообщающегося с другим портом (102) воздушного цилиндра, на середине участка хода. Регулятор (12) расхода содержит первый переключающий клапан (20), первый впускной канал (21) и второй регулирующий клапан (26). Первый переключающий клапан (20) выполнен с возможностью смещения из первого положения во второе положение под действием пилотного воздуха и предназначенный для обеспечения сообщения одного порта (104) воздушного цилиндра (100) с первым каналом (14) в своем первом положении и сообщения одного порта (104) воздушного цилиндра (100) с выпускным отверстием (48а) для воздуха через первый регулирующий клапан (28) в своем втором положении. Первый впускной канал (21) предназначен для ...

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10-04-1997 дата публикации

ГИДРАВЛИЧЕСКАЯ СИСТЕМА

Номер: RU95109938A1
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Использование: в мелиорации. Сущность изобретения: содержит гидроцилиндр с поршневой и штоковой полостями и два насоса. Один из насосов снабжен предохранительным клапаном и сообщен своей линией нагнетания через гидрораспределитель с линией нагнетания другого насоса. Этот насос подключен через четырехпозиционный распределитель к штоковой полости гидроцилиндра. Система снабжена трехпозиционным четырехлинейным распределителем с механизмом управления, сблокированным с рукояткой гидрораспределителя, подключенным одной из своих линий к поршневой полости гидроцилиндра, а другой - к одной из линий четырехлинейного распределителя с управлением от давления. Он установлен в линии нагнетания первого насоса и сообщен своей четвертой линией с баком. Обратный клапан установлен на участке гидролинии, сообщающей линию нагнетания второго насоса с поршневой полостью гидроцилиндра и подключен своим выходом к последней.

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23-01-1991 дата публикации

Гидропривод кабельного барабана транспортной машины

Номер: SU1622654A1
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Изобретение относится к системам энергоснабжения рельсовых транспортных средств и может быть использовано на транспортных машинах с питанием электроэнергией по гибкому кабелю. Цель иэобре V 1 тения - повышение надежности при аварийном отключении насоса. Гидроприаод кабельного транспортной машины содержащий насос 1, бак 2, клапан 3 давле- w п, обратимый гидромоюр 8, кинсмс1Т че- ски связанный с оэг баиом 9, снаОч зн гидроа/кумуг.ятэром 16 и рагпиедепителч- ми 13 и 14, элементы 22 и 13 управления которь ми сохзаны с датчиками скорости и напряжения тра -спсртног т среде ТРЭ. а жидкостная полость гидрсаккугллятора 16 подключена последовательно установленные распределители 13 и 14 к напорной гидролмнии 12. 1 и/-;:оаккумулятор 16 может быть вьр полней -рузовым в оиде гид- роци«,индров, опертых одним коииом на буксы, другие через пружины - на раму транспортною средства. 1 з.п ф-лы, 3 ил. сл С ,/ И| Фиг/ ...

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15-04-1986 дата публикации

Гидропривод

Номер: SU1224469A1
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19-06-1968 дата публикации

РЕГУЛЯТОР СКОРОСТИ

Номер: SU215682A1
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15-05-1988 дата публикации

Гидравлическое тормозное устройство

Номер: SU1395858A1
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Изобретение м.б, использовано в отбойных устройствах, предохраняющих от повреждений суда,и причальные сооружения . Цель изобретения - повышение надежности устройства..Противоположно направленные обратные клапаны 16, 17 установлены, в линии связи между поршневой полостью 8 силового цилиндра 2 и регулируемым дросселем 15. Управляемый логический элемент ИЛИ 4 установлен в торце.цилиндра 2.с возможностью взаимодействия.с поршнем 5. Входы элемента 4 подключены к источнику 1 питания и штоковой полости 7, а выход - к полости 8. Устройство управления элементом 4 выполнено в виде подпружиненного плунжера 24, связанного посредством тяги с запорным элементом . При воздействии инерционного объекта на шток 6 цилиндр 2 приходит в движение, сжимая рабочую жидкость в полости 8. При этом взаимодействие плунжера 24 и поршня 5 ликвидируется, в результате чего вытесняемая жидкость , поступает в полость.13 цилиндра 3. Как только давление рабочей жидкости достигнет величины давления источника питания, шток 11 ...

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07-11-1992 дата публикации

Гидропривод грузоподъемного механизма

Номер: SU1774074A1
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Сущность изобретения: насос сообщен через реверсивный гидрораспределитель с гидроцилиндром подъема стрелы подводящим и отводящим трубопроводами. Управляемый клапан установлен в отводящем трубопроводе и подключен выходом к выходу гидрораспределителя. Первый обратный клапан установлен параллельно управляемому клапану и подключен выходом к входу последнего. Второй обратный клапан установлен в трубопроводе, соединяющем подводящий и отводящий трубопроводы, и подключен выходом к поршневой полости гидроцилиндра. Управляющая полость управляемого клапана подключена к второму выходу гидрораспределителя. Управляемый обратный клапан установлен в трубопроводе , соединяющем подводящий и отводящий трубопроводы, и подключен входом к входу второго обратного клапана. Полость управления управляемого обратного клапана подключена к подводящему трубопроводу. Дроссель установлен в линии управления управляемого клапана. 1 з.п ф-лы. 1 ил. (Л ...

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28-02-1985 дата публикации

Гидропривод

Номер: SU1142667A1
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ГИДРОПРИВОД, содержащий насос, предохранительный клапан, установленный между линией нагнетания Засоса и баком, гидродвигатель, рабочие полости которого сообщены через гидрораспределитель с линией нагнетания насоса и с баком, и гидроуправляемый напорньй клапан, о тли чающийся тем, что, с целью повышения пускового момента путем увеличения градиента нарастания давления перед гидромотором, он снабжен гидроуправляемым обратным клапаном, подключенные параллельно напорному клапану, установленному на входе в рабочую полость гидродвигателя , сообщенную с линией О) управления обратного клапана. 1 ю Ф а ...

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23-01-1992 дата публикации

Механизм поворота грузоподъемного крана

Номер: SU1707301A1
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Изобретение относится к грузоподъемным механизмам. Цель изобретения - повышение эффективности демпфирования и 18 20 21 М V 25 26V VW//Y/ /y////////S/ ffZ Ч -гЛ sUW y///// , /// feg&d . 22 23 19 упрощение конструкции. В механизме поворота , содержащем закрепленную на колонне шестерню с возможностью взаимодействия с зубчатой рейкой, два поршня основное демпфирующее устройство и дополнительное демпфирующее устройство , с целью повышения эффективности демпфирования расточки 19 соединены между собой осевым каналом 17, дополнительное демпфирующее устройство выполнено в виде двух демпферов. расположенных в расточках 19, подносного клапана 24 с доос- селем 23. Кроме того, в механизме поворота полые плунжеры 25 выполнены с радиальными каналами 23. а их пружины 26 оперты на торцы демпферов. 1 з.п. Ф-лы, 2 ил. 25 26V 28 fe , . X $ 29 I7 Й Сл) О ...

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23-02-1982 дата публикации

ГИДРОСИСТЕМА

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23-08-1993 дата публикации

METHOD AND APPLIANCE FOR VELOCITY CHANGE OF OPERATING ELEMENT IN PISTON-TYPE HYDRAULIC DRIVE

Номер: RU1835468C
Автор:
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07-11-1988 дата публикации

Гидросистема

Номер: SU1435856A1
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Изобретение может быть использовано в гидроприводах металлорежущих станков . Цель изобретения - повышение надежности гидросистемы. Поршневая 2 и штоковая 3 полости гидроцилиндра 1 через распределительное устройство 4 связаны с источником 5 питания и сливом 6. Устройство 4 выполнено в виде двух трехпозици- онных распределителей (Р) 7 и 8. Р 7 выполнен пятилинейным, одна линия (Л)9 которого соединена с насосом 5, вторая Л 10 - со сливом 6, тремя Л 11 - с полостью 3. Полость 2 соединена через регулируемый дроссель 12 с одной из Л 13 Р 8 и непосредственно с Л 14. Р 8 выполнен также пятилинейным. Л 15 и 16 Р 8 соединены также с одной из Л 11 и ЮР 7. Пятая Л 17 Р 8 соединена с его Л 13, соединенной с дросселем 12. I табл. 1 ил.

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15-07-1993 дата публикации

ПPИBOД

Номер: RU1827448C
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07-04-1993 дата публикации

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Номер: RU1807252C
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23-04-1987 дата публикации

Гидравлическая система

Номер: SU1305450A1
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Изобретение м.б. использовано в грузоподъемных средствах. Цель изобретения - повышение производительности . Исполнительный механизм снабжен дополнительным гидроцилиндром (ГЦ) 11, штоковая полость 12 к-рого сообщена со штоковой полостью 7 силового ГЦ 6, а бесштоковая полость 13 через двухпозиционный гид- роуправляе1ушй распределитель (Р) 22 - с гидроаккумулятором (ГА) I4 и сливом . Полость 7 ГЦ S сообщена также через трехпозиционный гидроуправляе- мый Р 23 и ГА 14 с основным Р 1. Линия 25 управления Р 22 сообщена с бесштоковой полостью 8 ГЦ 6, линия 26 - с линией 27 управления Р 23, а линия 28 управления Р 23 - с гидравлическим выключателем 24. При попутных нагрузках ГА 14 заряжается от ГЦ 11, а при препятствующих - раз- . ряжается в систему, что повьппает ее производительность. I ил. i СЛ 00 О сд 4; СП ...

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23-05-1987 дата публикации

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Изобретение м.б. использовано в станкостроении. Цель изобретения - расширение функциональных возможностей путем получения обратной рабочей подачи. Для этого штоковая полость 2 гидроцилиндра I дополнитель-; но сообщена с источником 7 питания через последовательно установленные двухпозиционный распределитель 25, регулятор 26 скорости и обратный клапан 27. Вход регулятора 26 сообщен с пружинной полостью 23 подпорного клапана 16, вход которого сообщен через обратный клапан 5 с по- лостью 2, а выход - с бесштоковой полостью 3. При включении распределителя 25 рабочая жидкость -поступает в полость 2 через регулятор 26, осуществляя рабочукг подачу при обратном ходе, при этом клапан 16 закрыт давлением жидкости в полости 23. 1 ил. (Л оо ...

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15-08-1983 дата публикации

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Номер: SU1035302A1
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ГИДРОПРИВОД, содержащий насосы рабочих подач и быстрых ходов, распределительные узлы включения рабочих подач и быстрых ходов, линии управления которых сообщены через электромагнитные распределители с линией нагнетания насоса подач , цилиндр со щтоковой и бесщтоковой полостями, сообщенными через распределительные узлы с линиями нагнетания насосов , предохранительные клапаны, установленные в гидролиниях связи линий нагнетания насосов со сливной линией, и клапан противодавления, отличающийся тем, что, с целью упрощения конструкции гидропривода , распределительный узел включения быстрых ходов выполнен в виде двух гидроуправляемых распределителей клапанного дифференциального типа, причем гидролиния подвода одного распределителя сообщена с линией нагнетания насоса подач, а гидролиння отвода - со щтоковой полрстью цилиндра, гидролиния подвода другого распределителя , соединена со сливной линией через распределительный узел включения рабочих подач, а гидролиния отвода - с бесщтоковой полостью цилиндра ...

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15-03-1989 дата публикации

Система управления лесопогрузчиком

Номер: SU1464968A1
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Изобретение м. б. использовано в лесном машиностроении. Цель изобретения - упрощение конструкции и повышение эффективности работы лесопогрузчика. Стрела перемешается в вертикальной плоскости. Отводы 3 и 4 гидрораспределителя 2 соединены гидромагистралями 5 и 6 с полостями (П) 7 и 8 исполнительного гидроцилиндра 9. Устр-во 10 для опускания стрелы под действием силы тяжести выполнено в виде поршневого клапана, содержащего корпус 12 с кольцевой проточкой 13 и подпружиненный поршень 14. Поршень 14 образует П 15 и 16 и снабжен аксиальным каналом 17. Устр-во 10 установлено в гидромагистрали 5, соединяющей П 7 с отводом 3 т. обр., что П 15 соединена с П 7. П 16 соединена с отводом 3, проточка 13 - с гидромагистралью 6, соединяющей П 8 с отводом 4. 1 ил.

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23-07-1989 дата публикации

Пневмопривод

Номер: SU1495534A1
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Изобретение может быть использовано в промышленных роботах и в системах автоматизации. Цель изобретения - повышение быстродействия пневмопривода. Поршневая и штоковая полости (П) 2,3 пневмоцилиндра (ПЦ) 1 соединены через параллельно установленные обратный клапан 4 и дроссель 5 и реверсивный распределитель 6 с источником 7 давления и сбросом 8. Вход клапана 12 последовательности с П 13,14 управления подключен к П 3, выход - к сбросу 8. П 13 подпружинена и подключена линией 15 к П 2. Переливной клапан 9, дроссель 10 и ресивер 11 установлены последовательно в линии 15. Тормозная втулка 17 жестко связана с поршнем ПЦ 1. В корпусе ПЦ 1 выполнена цилиндрическая расточка 18. П 14 подключена к линии 16 соединения входа клапана 12 с П 3. За счет сброса избытка сжатого воздуха из П 3 происходит плавное торможение поршня ПЦ 1 при различных инерционных нагрузках. 4 ил.

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15-05-1983 дата публикации

Гидравлический привод

Номер: SU1017832A1
Принадлежит:

ГИДРАВЛИЧЕСКИЙ ПРИВОД, содёр-. жащий регулируемый насос с регулятором , полость управления которого подключена к напорной гидролинии, и гидроцилиндр с рабочей и возвратной полос .тями сообщенными через дросселирующий распределитель с напорной гидролинией , отлича-ющийся тем, что, с целью повышения КПД, он снабжен гидрозймком и гидроуправляемйм клапаном, полость управления .которого сообщена с напорной гидролинией, полость управления регулятора связана через гидрозамок с рабочей полостью гидроцилиндра, а через гидроуправляемый клапан - с напорной гидролинией насоса. сл с о -4j ас с ю ...

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23-01-1992 дата публикации

Гидросистема машины для очистки и изоляции наружной поверхности трубопровода

Номер: SU1707291A1
Принадлежит:

Изобретение относится к гидроприводам , рабочих органов машин для строительства магистральных трубопроводов, в частности машин для очистки и изоляции трубопроводов и может быть использовано в машиностроении. Цель изобретения - увеличение долговечности ходовых колес и повышение надежности работы машины как на подъёмах, так и на спусках. Достигается это тем, что при движении машины на подъем толкатель 14 маятникового устройства находит на управляющий ролик дросселя 13, тем самым уменьшая его проходные сечения . При этом в трубопроводе между насосом 10 и гидроцилиндром 12 создается подпор жидкости, а гидроцилиндр 12 прижимает ходовые колеса к трубе. При движении машины под уклон толкатель 14 находит на ролик гидрораспределителя 9, переключает его в крайнее левое положение. Таким образом на выходе гидромотора 7 появления подпора рабочей жидкости и исключается насосный режим гидромотора 1. При этом обеспечивается равномерное движение машины под уклон. 1 ил Ё ...

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23-02-1992 дата публикации

Гидропривод

Номер: SU1058387A1
Принадлежит:

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07-11-1991 дата публикации

Гидросистема грузового крана

Номер: SU1689673A1
Принадлежит:

Изобретение относится к гидроприводам и системам управления для грузоподъемных машин, например для грузовых кранов . Цель изобретения - повышение надежности , безопасности работы крана. Для этого на выходе насосов 6 и 25 установлены обратные клапаны 26, 27, а насос 25 снабжен автоматом разгрузки. Кнопочная станция 10 4 и датчик 2 давления связаны с входами логического блока 29 управления. Блок состоит из логических элементов И 15, 35, НЕ 20, элемента 23 выдержки времени Датчик 2 давления связан с элементом И 15, а выход элемента И 35 связан с автоматом 28 разгрузки Входы элементов И 15 и 35 связаны с кнопкой «Подъем груза станции 10 Кнопочные станции 9 и 10 и датчик 2 давления через логический блок 32 связаны с органами 14 и 12 управления гидрораспределителей 3 и 5 Блок 32 содержит логические элементы И 16, 17 36 и 37, ИЛИ 18 и 19. НЕ 21 и 22, элемент 24 выдержки времени. Кнопка «Подъем груза станции 10 связана с элементом ИЛИ 18, кнопка «Подъем стрелы станции 9 - с элементами И 16 и 36 ...

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07-12-1983 дата публикации

Гидропривод

Номер: SU1059288A1
Принадлежит:

ГИДРОПРИВОД, содержащий исполнительный гидроцилиндр с двумя поршнями разного диаметра, меньший из которых выполнен со штоком, размещенным с образованием штоковой и бесштоковой полостей , сообщенных с насосом через распределитель , отличающийся тем, что, с целью упрощения конструкции, поршень меньшего диаметра выполнен плунжерного типа и установлен свободно относительно поршня большего диаметра, а распределитель выполнен четырехлинейным пятипозиционным с сообщением в одной из его позиций штоковой полости с насосом и запиранием поршневой полости, а в другой позиции - с сообщением штоковой полости со сливом и запиранием поршневой полости. 1« i (П ...

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23-10-1990 дата публикации

Гидравлический привод

Номер: SU1601420A1
Принадлежит:

Изобретение относится к объемному гидроприводу и может быть использовано в устройствах, от которых требуется постоянство заданной скорости гидродвигателя. Цель изобретения - повышение точности позиционирования. Гидравлический привод, содержащий насос 1, гидродвигатель 4, распределительный золотник 7, редукционное устройство 10, при этом рабочие полости 5 и 6 гидродвигателя 4 сообщены через золотник 7 с напорной и сливной гидролиниями 2 и 3 и через согласующий клапан 12-с пружинной полостью 11 редукционного устройства, управляющая полость 13 которого сообщена с напорной гидролинией 2, снабжен обратным клапаном 15, установленным в напорной гидролинии 2, и мультипликатором 16, насосная полость 17 которого соединена с напорной гидролинией 2 после обратного клапана 15, а приводная полость 18 - перед обратным клапаном 15. 2 ил.

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07-12-1983 дата публикации

Гидропривод

Номер: SU1059287A1
Принадлежит:

ГИДРОПРИВОД, содержащий гидродвигатель , сообщенный с напорной и сливной гидролиниями через реверсивный распределитель , и устройство торможения, выполненное в виде дополнительного распределителя , вход и выход которого сообщены со сливной гидролинией, и дросселя, установленного в сливной гидролинии параллельно дополнительному распределителю, отличающийся тем, что, с целью повышения надежности, устройство торжения дополнительно содержит дроссель, установленный в напорной гидролинии параллельно дополнительному распределителю, а последний содержит дополнительные вход и выход для подлючения к напорной гидролинии. П:г ih-l-tS3-4 НГ Ф /Т L п/ I Г2 I ..

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07-02-1990 дата публикации

Гидропривод механизма перемещения деревьев

Номер: SU1540731A1
Принадлежит:

Изобретение относится к гидроприводам подачи цикличного действия и может быть использовано в лесозаготовительных машинах для обрезки сучьев. Цель изобретения - повышение надежности путем снижения динамических нагрузок и повышение производительности за счет увеличения скорости холостого хода. Гидропривод содержит два кинематически связанных гидромотора 1 и 2, соединенных параллельно через гидрораспределитель 5 с источником 6 питания и сливом 7. Кроме того, он снабжен управляемым обратным клапаном 8, вход и полость 9 управления которого соединены с гидролинией 3 рабочего хода, дросселем 10 и емкостью 11 в линии его управления и дросселем 12, устанолвленным в гидролинии 4 холостого хода на входе 13 в гидромотор 1, соединенном со сливом 7. При холостом ходе большая часть потока рабочей жидкости поступает на вход гидромотора 2, а меньшая через дроссель 12 на вход 13 гидромотора 1, что увеличивает скорость холостого хода по сравнению с рабочим ходом. При торможении механизма перемещения после ...

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07-02-1986 дата публикации

Гидропривод горной машины

Номер: SU1209848A2
Принадлежит:

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15-12-1980 дата публикации

Гидропривод

Номер: SU787741A1
Принадлежит:

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31-01-1964 дата публикации

Устройство для пуска и останова гидротурбин малой мощности

Номер: SU160686A1
Автор: Чумак Д.И.
Принадлежит:

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23-01-1992 дата публикации

Гидросистема машины для уплотнения балласта железнодорожного пути

Номер: SU1707292A1
Принадлежит:

Изобретение относится к гидроприводам рабочих органов машин для ремонта железнодорожного пути, в частности машин для уплотнения балласта, и может быть использовано в транспортном машиностроении . Цель изобретения - снижение энергозатрат и расширение функциональных возможностей. Для этого подается пульсирующий электрический сигнал на гидрораспределитель 10, при этом поршневая полость одного гидроцилиндра 1 или 2 соединяется с напорной магистралью, а другого - со сливом. Пульсирующий поток рабочей жидкости, поступающей от гидрораспределителя 10, обеспечивает вибрацию штоков гидроцилиндров 1 и 2. Частота вибрации регулируется генератором колебаний 12, а амплитуда вибраций - изменением расхода насоса 5, причем лишний расход рабочей жидкости сливается в бак б через предохранительный клапан 15. Регулятор 11 расхода отрегулирован на расход жидкости , поступающей от нзсоса 5. Положение регулятора расхода 11 обеспечивает обратный ход штока гидроцилиндра 1 или 2, равный амплитуде вибраций без перемещения ...

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12-12-2013 дата публикации

Device for moving hydraulic pistons arranged in hydraulic cylinder in calender of e.g. paper-making machine, has parallel circuit valve e.g. solenoid Valve, arranged between digital hydraulic pressure control valves and hydraulic cylinders

Номер: DE102012209528A1
Принадлежит:

The device has chambers (A, B, A', B') formed in a hydraulic cylinder (13, 13'). The chambers are impinged by hydraulic pressure produced by hydraulic fluid e.g. hydraulic oil, over hydraulic lines guiding a digital hydraulic pressure control valves (15, 15'). The digital hydraulic pressure control valves comprise series parallel circuit valves, supply lines and a removing line (23). A parallel circuit valve e.g. solenoid Valve, is arranged between the digital hydraulic pressure control valves and the hydraulic cylinders. Independent claims are also included for the following: (1) a device for changing position of a mass (2) a method for movement of mass by moving pistons (3) a method for checking function of a pressure accumulator.

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05-10-2017 дата публикации

Hydraulische Antriebsvorrichtung mit Regenerationsbetrieb

Номер: DE102016205582A1
Принадлежит:

Die Erfindung betrifft ein hydraulisches Antriebssystem (10) mit einer Pumpe (11), einem Tank (12), einem Zylinder (20) und einem Wegeventil (30), wobei der Zylinder (20) eine erste und eine zweite Zylinderkammer (21; 22) aufweist, wobei das Wegeventil (30) zumindest eine erste und eine zweite Blende (41; 42) aufweist, wobei sich ein erster Fluidströmungspfad (51) ausgehend von der Pumpe (11) über die erste Blende (41) zur ersten Zylinderkammer (21) erstreckt, wobei sich ein zweiter Fluidströmungspfad (52) ausgehend von der zweiten Zylinderkammer (22) über die zweite Blende (42) zur ersten Zylinderkammer (21) erstreckt, wobei die zweite Zylinderkammer (22) an ein Druckbegrenzungsventil (60) angeschlossen ist. Erfindungsgemäß ist der Auslösedruck des Druckbegrenzungsventils (60) auf elektrische Weise stetig verstellbar, um eine Regeneration von Druckfluid von der zweiten Zylinderkammer (22) zur ersten Zylinderkammer (21) hin zu aktivieren bzw. zu deaktivieren, wobei in dem zweiten Fluidströmungspfad ...

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24-01-1985 дата публикации

Номер: DE0002308146C2
Принадлежит: FORD-WERKE AG, 5000 KOELN, DE

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20-10-2011 дата публикации

Hydrostatischer Fahrantrieb

Номер: DE102010015498A1
Принадлежит:

Offenbart ist hydrostatischer Fahrantrieb mit zumindest zwei in Reihe geschalteten Hydromotoren, die über eine Verstellpumpe mit Druckmittel versorgt sind. Erfindungsgemäß wird im Druckmittelströmungspfad zwischen den beiden Hydromotoren ein vorbestimmter Druckmittelvolumenstrom abgezweigt. Bei Überschreiten eines gewissen Schlupfes am stromaufwärtigen Hydromotor schaltet sich der stromabwärtige Hydromotor selbsttätig zu.

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04-11-2004 дата публикации

Hydrostatic drive system for excavators, has sensor that detects if valve mechanism is in flow position to enable deceleration of rotary load

Номер: DE0010317659A1
Принадлежит:

A rotary load (2) e.g. hydraulic motor is connected through a gearbox (3) to a driving element (4). Deceleration of the load is allowed when a sensor (20) detects that a valve mechanism (12) is in a flow position (13a).

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21-09-2006 дата публикации

Hydrostatikkreislauf-Entleerventil zum reduzieren des von einer hydrostatischen Einheit benötigten Antriebsdrehmoments

Номер: DE0010049827B4

Hydrostatikkreislauf - Entleerventil für eine hydrostatische Kraftübertragungsvorrichtung, die eine hydraulische Pumpe (10) und einen mit der hydraulischen Pumpe (10) fluidmäßig in einem geschlossenen Kreislauf durch erste und zweite Systemdruckleitungen (14, 16) verbundenen hydraulischen Motor (12) enthält; wobei das Kreislauf-Entleerventil ein Paar von Entleerventilen (24, 26), welche jeweils fluidmäßig mit den ersten bzw. zweiten Systemdruckleitungen (14, 16) verbunden sind, aufweist; die Entleerventile (24, 26) normalerweise mittels einer Feder (30) in eine offene Position vorgespannt sind, wodurch Fluid durch die Entleerventile (24, 26) hindurch während des Startvorgangs der Kraftübertragungsvorrichtung abläuft; die Entleerventile (24, 26) automatisch geschlossen werden, sobald der Druck in den entsprechenden ersten und zweiten Systemdruckleitungen (14, 16) die Federvorspannung überschreitet und die Entleerventile (24, 26) Geschwindigkeitssicherungsventile (24a, 26a) sind.

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26-06-2003 дата публикации

Schwenksteueralgorithmus für eine Hydraulikschaltung

Номер: DE0010250588A1
Принадлежит:

Ein Strömungsmittelsteuersystem kann eine Pumpe, einen Tank und eine Betätigungsvorrichtung aufweisen, die eine Arbeitskammer aufweist. Das System kann betreibbar sein, um die Drehbewegung einer Schwenkstruktur und mindestens ein Werkzeug zu steuern. Eine Ventilanordnung kann konfiguriert sein, um die Strömungsmittelverbindung zwischen der Arbeitskammer und dem Tank und zwischen der Arbeitskammer und der Pumpe zu steuern. Eine Eingabevorrichtung kann betreibbar sein, um selektiv eine Bewegung der Schwenkstruktur zu steuern. Das System kann eine Steuervorrichtung in Verbindung mit der Ventilanordnung und der Eingabevorrichtung aufweisen. Die Steuervorrichtung kann konfiguriert sein, einen Flusszustand und einen Druckzustand der Arbeitskammer durch einen abgefühlten Druckzustand der Arbeitskammer und einen Befehl von der Eingabevorrichtung zu steuern.

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16-06-2011 дата публикации

Ventilanordnung zur Ansteuerung eines Verbrauchers

Номер: DE102009058371A1
Принадлежит:

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03-05-2012 дата публикации

Hydraulische Anordnung

Номер: DE102010043135A1
Принадлежит:

Es wird eine hydraulische Anordnung (10) zur Erhöhung einer Motorlast beschrieben. Die hydraulische Anordnung umfasst einen hydraulischen Verbraucher (28), eine lastdruckgesteuerte Hydraulikpumpe (24), einen Hydrauliktank (26) und einen mit dem hydraulischen Verbraucher (28) verbundenen hydraulischen Steuerkreis (30), mit welchem ein von der Hydraulikpumpe (24) geförderter Volumenstrom veränderbar ist, wobei der hydraulische Steuerkreis (30) ein Überdruckventil (42) und ein elektronisch ansteuerbares Steuerventil (36) umfasst. Um eine Priorisierung des hydraulischen Verbrauchers bei gleichzeitiger Erhöhung der Motorlast sicherzustellen wird v0) zwischen Überdruckventil (42) und Steuerventil (36) eine lastdruckgesteuerte Druckwaage (38) umfasst.

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20-02-1986 дата публикации

Номер: DE0002402112C2

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15-12-1983 дата публикации

HYDROSTATISCHER ODER PNEUMATISCHER ANTRIEB SOWIE VERFAHREN ZU SEINEM BETRIEB

Номер: DE0003222008A1
Принадлежит:

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25-03-1993 дата публикации

HYDRAULISCHES VENTIL.

Номер: DE0003280429D1
Принадлежит: ANDERSSON BO, ANDERSSON, BO, SKELLEFTEA, SE

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25-09-2014 дата публикации

Hydrostatisches Antriebssystem

Номер: DE0010150679B4

Hydrostatisches Antriebssystem mit einer Pumpe (1), insbesondere einer Load-Sensing-geregelten Pumpe, einem ersten mit Priorität betreibbaren Verbraucher (7) und zumindest einem weiteren Verbraucher, wobei zur Steuerung der Verbraucher (7) jeweils ein Steuerventil (6) mit einer zugeordneten Druckwaage (8), an der eine Regeldruckdifferenz vorgegeben ist, vorgesehen ist, dadurch gekennzeichnet, dass zur Verringerung der Priorität des ersten Verbrauchers (7) ein von einer Bedienperson betätigbarer Betriebsartenschalter vorgesehen ist, wobei in Abhängigkeit von der Betätigung des Betriebsartenschalters die Bewegungsgeschwindigkeit des ersten Verbrauchers (7) bei der Betätigung des weiteren Verbrauchers durch eine stufenweise Verringerung der an der dem ersten Verbraucher (7) zugeordneten Druckwaage (8) vorgegebenen Regeldruckdifferenz reduzierbar ist.

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29-05-2008 дата публикации

Steuergerät für einen hydraulischen Aufzug mit Gegengewichtsausgleich

Номер: DE0010228009B4
Принадлежит: PRATES FLORIAN, PRATES, FLORIAN

Steuergerät für einen hydraulisch betriebenen Aufzug mit Gegengewichtsausgleich dadurch gekennzeichnet, dass in das Steuergerät eine An- und Feinfahr-Kombination integriert ist, deren Feinfahrdrossel 5 über ein Magnetventil 4 von einer separaten Steuerpumpe 3 mit definierter Literleistung gesteuert wird, mit einem einerseits vom Hauptpumpendruck andererseits vom Zylinderdruck und einer Feder 11 beaufschlagten Feinfahrregler 9 kombiniert ist, wobei die Kraft der Feder 11 umgerechnet auf die Fläche des Reglers 9 das Druckgefälle an der Feinfahrdrossel 5 bewirkt und beim Übersteigen des von der Feder 11 definierten Druckgefälles das überschüssige Öl über den Feinfahrregler 9 in den Rücklauf geleitet wird.

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26-11-1975 дата публикации

APPARATUS COMPRISING A HYDRAULIC DRIVE MOTOR OR A HYDRAULIC JACK

Номер: GB0001415571A
Автор:
Принадлежит:

... 1415571 Hydrostatic transmissions VERLINDE SA 21 May 1973 [23 May 1972] 24161/73 Heading F2W In a hydrostatic transmission in which a fixed displacement pump 3 driven at constant speed supplies pressure fluid to a drive motor unit 13 (comprising motors 14 and 15 as shown) which may comprise rotary motors or a hydraulic jack, the pump is guarded against excess output pressure by a relief valve 20 from which fluid returns to a reservoir 1, a proportion of the output of the pump passes through a control valve 33 and via pipes 36 and 27, a fixed throttle valve 18 and a variable throttle 53 to the reservoir, the rest passing via a reversing valve 10 to the motors 14, 15. The control valve 33 is biased on one side, 33b, by the pump output pressure and on the opposite side by a spring 34 and the output pressure taken from the output side of a variable throttle 39 (Fig. 2) of a control unit 8 which also incorporates variable throttle 53. The throttle valve 39 is varied by movement of a piston 40 ...

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06-04-1955 дата публикации

Improvements relating to hydraulically operated machine tools

Номер: GB0000727752A
Принадлежит:

... 727,752. Hydraulically-operated machine tools. CHURCHILL MACHINE TOOL CO., Ltd. Sept. 9, 1953 [Sept. 16, 1952], No. 23249/52. Class 69 (2). [Also in Group XXII] Hydraulic mechanism for reciprocating a machine tool table comprises a metering pump h of the gear type connected between the opposite ends of a cylinder g containing a piston e connected to the table. On an operative stroke of the piston the metering pump h and a main pump a deliver oil to the right-hand side of the cylinder, oil from the exhaust side of the cylinder passing through the pump h, which therefore controls the speed of the piston. On the return stroke, pump a delivers to the lefthand side of the cylinder, the right-hand side being open to an exhaust pipe m. A reversing valve d is operated automatically from the reciprocating table and can also be operated by hand.

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18-05-1977 дата публикации

DEVICE FOR REGULATING AUTOMATICALLY THE FLOW IN A HYDRAULIC CIRCUIT

Номер: GB0001473566A
Автор:
Принадлежит:

... 1473566 Measuring fluid flow-rate electrically F LLI SANDRETTO SAS 15 July 1974 [3 Jan 1974] 31195/74 Heading G1N [Also in Division G3] In a control arrangement for regulating the volume flow-rate of hydraulic fluid in a hydraulic circuit of injection moulding machines, (see heading G3R), the flow-rate is measured by a transducer as shown Fig. 2. The transducer comprises a hydraulic motor, gears 27 of which are rotated by fluid flowing in a pipe 4. Movement of the gear teeth past a pin 30 of magnetic material in a magnetic circuit, including a core 33 carrying a D.C. energized primary winding 36, varies the reluctance of the circuit. This results in a series of pulses from a secondary winding 37, the frequency of which is a function of the fluid flow-rate.

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03-01-1968 дата публикации

Friction clutch control system

Номер: GB0001097869A
Автор:
Принадлежит:

... 1,097,869. Clutch control. FORD MOTOR CO. Ltd. Aug. 22, 1966 [Aug. 30, 1965 (2)], No. 37515/66. Heading F2L. A vehicle clutch control system comprises an hydraulic servo 10 for effecting clutch release and under the control of a shift valve 32 and a pilot valve 60 which operates the shift valve 32 in response to a manual control 140 and a signal indicative of engine operating conditions, e.g. manifold vacuum, actuation of the manual control causing the shift valve 32 to connect the servo 10 with its pressure source for clutch release, and release of the control causing the shift valve to exhaust the servo for clutch reengagement at a rate dependent upon engine conditions. As shown, pressure liquid for the system is supplied by an engine-driven pump 20 and shift valve 32 is combined with a pressure-regulating valve 30. Pilot valve 66 is operated by a pair of vacuum diaphragm units 96, 98, the former of which is permanently connected by a line 132 to the engine manifold, while the vacuum ...

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10-02-1988 дата публикации

METHOD & APPARATUS FOR CONTROLLING CHARGING SPEEDS OF INJECTION MOULDING MACHINES

Номер: GB0008800108D0
Автор:
Принадлежит:

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02-08-1995 дата публикации

Hydraulic circuit for turning

Номер: GB0009510912D0
Автор:
Принадлежит:

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02-10-2002 дата публикации

System for controlling operation of cylinder of vehicle

Номер: GB0002369097B
Принадлежит: KOMATSU MFG CO LTD, * KOMATSU LTD

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01-12-2004 дата публикации

Variable flow control apparatus for heavy construction equipment

Номер: GB0002402173A
Принадлежит:

The control apparatus comprises an actuator connected to a hydraulic pump, a directional control valve (100 Fig. 2) between the pump and actuator to control the actuator when its spool (3) moves in housing 1 and a proportioning seat valve arrangement 500. A first seat valve 501 is installed in the housing and has a variable throttle 512, a second seat valve 502 is installed between pump path 7c downstream flow paths 7a,b and has a variable throttle 511 when moved relative to the first seat valve. Pilot flow control valve 2 has pilot spool 41 switchable by pilot pressure Pi controls the first and second seat valves. Third seat valve 503 is installed elastically movably relative to the second seat valve and opens to direct constant flow from the pump path to the flow paths when pilot pressure over a certain level. A sub-piston 604 is installed within the pilot spool acts towards pilot closure in response 600, 601 602, 603 to flow path pressure allows opening of the second seat valve.

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09-12-2009 дата публикации

Actuator controller

Номер: GB2460568A
Принадлежит:

An actuator controller comprises meter-in and meter-out solenoid valves (V1, V4) for controlling the supply/discharge of the working fluid to/from a rod opposite-side fluid chamber (4b), meter-in and meter-out solenoid valves (V3, V2) for controlling the supply/discharge of the working fluid to/from a rod-side fluid chamber (4a), maps for defining the characteristics of the orifice areas of the meter-in and meter-out solenoid valves (V1, V3; V2, V4) with respect to the speed command of the actuator, judging means for judging the operating state of the actuator on the basis of the results of detection of a detector for detecting operation information on the actuator, and selecting means for selecting a map used for the control from the maps according to the operating state of the actuator.

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02-07-1986 дата публикации

DIRECTIONAL CONTROL VALVE UNIT

Номер: GB0002143304B

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08-05-1968 дата публикации

Device for regulating the pressure medium outlet of servomotors

Номер: GB0001113295A
Автор: ROCKSTROH FRIEDBERT
Принадлежит:

... 1,113,295. Clutch control. WISSENSCHAFTLICH - TECHNISCHES ZENTRUM AUTOMOBILBAU. 9 Nov., 1965, No. 47497/65. Heading F2L. A device enables a vehicle clutch to be reengaged in two-phases when the accelerator pedal is in the idling position and in one-phase for other positions of the pedal. An electromagnet 2 is energized upon touching of a gear lever to open valve 5 and admit compressed air from an inlet 7 to a servo via connector 8 to release the clutch. After a new gear has been engaged, the electromagnet 2 is de-energized and a spring 6 closes valve 5; compressed air from the servo vents to atmosphere through an adjustable pressure relief valve 15. With the accelerator pedal in the " idle position," the compressed air escapes rapidly through valve 15 until closure of this valve when air continues to escape via bore 19 for a gentle complete engagement of the clutch. Should the accelerator pedal be depressed, a lever 13 rotates a cam 11 to open valve 15 through rod 14 for a rapid complete ...

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31-10-2001 дата публикации

System for controlling operation of cylinder of vehicle

Номер: GB0000121951D0
Автор:
Принадлежит:

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09-02-1977 дата публикации

HYDRAULIC CONTROL SYSTEM

Номер: GB0001464142A
Автор:
Принадлежит:

... 1464142 Valves MAXTON MFG CO 25 Jan 1974 [15 Feb 1973] 32911/76 Divided out of 1464141 Heading F2V The subject-matter is the same as that described in the parent Specification 1,464,141, but the claims are particularly concerned with the by-pass valve (36, Figs. 5, 11 &c. not shown) in the hydraulic control system.

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30-11-1960 дата публикации

A device for regulating the speed of a servo-motor capable of producing an alternating motion

Номер: GB0000855339A
Принадлежит:

... 855,339. Lathes; machine-tool details. SZERSZAMGEPFEJLESZTO INTEZET. March 29, 1957. No. 10436/57. Class 83 (3). A device for regulating the speed of a piston- and cylinder-feed for lathe and other machinetool slides, includes a valve or control element moved by control means described in Specification 816,444, and is additionally provided with indexing mechanism for a movable selector-stop arrangement, which is started up when a predetermined point is reached in a cycle of operations. As applied to lathes, the longitudinal carriage 3, Fig. 2, and the cross-slide 4 are moved by piston-and-cylinder means 1, 2, respectively. These means are controlled by the axial movement of valves 5, 6 respectively, which are connected to axially-movable drums 8, 8a. These drums are rotated by gearing 13 from the lathe-spindle 15, Fig. 1. Rollers 10, 10a, Figs. 1 and 2, bearing against the drums, are carried on rotatable-pins 11 supported in longitudinallymovable slides 24, 24a respectively. These slides ...

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15-07-1959 дата публикации

Device for regulating the speed of servo-motors capable of producing alternating motion

Номер: GB0000816444A
Принадлежит:

... 816,444. Copy-turning. LICENCIA TALALMANYOKAT ERTEKESITO VALLALAT. Aug. 16, 1956, No. 25138/56. Class 83 (3). In a lathe, the tool-slide is fed by a differentialpiston 2, Fig. 1, in a cylinder 1 supplied at both ends simultaneously by an hydraulic pump 3. The pressure at the larger end 6 of the cylinder is controlled by varying the outlet 10 by axial movement of a plunger or drum 18, which is rotated at 19 from the head-stock spindle. A roller 13 engages the drum and is carried by a pivot 14 rotatably adjustable at 15 in a slide 11 movable parallel to the drum axis bv a rod 11a, together with the piston 2 and tool-slide. The roller is adjustable angularly to allow it to roll without friction along a helical line on the drum so long as the spindle-speed remains constant, but if this varies, the rotational speed of drum 18 will change and produce an axial-thrust on the roller. This thrust moves the drum axially, to enlarge or decrease the outlet 10 and thus vary the traversing-speed of the ...

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17-04-2019 дата публикации

Controller unit and liquid-pressure driving system

Номер: GB0002567594A
Принадлежит:

This controller unit is provided to a hydraulic drive system for an operating machine that moves a structure using an actuator by supplying a hydraulic fluid to the actuator. The controller unit has: a gyro sensor that outputs a signal corresponding to the operation speed of the structure; and a controller that controls, on the basis of the signal corresponding to the operation speed of the structure, said operation signal being outputted from the gyro sensor, the flow rate of the hydraulic fluid to be supplied to the actuator. The controller is attached to the structure, and the gyro sensor is incorporated in the controller.

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31-10-2015 дата публикации

METHOD FOR REGULATING THE SPEED OF A CLAMPING AND LIFTING DEVICE

Номер: AP2015008824A0
Принадлежит:

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31-10-2015 дата публикации

METHOD FOR REGULATING THE SPEED OF A CLAMPING AND LIFTING DEVICE

Номер: AP0201508824A0
Принадлежит:

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31-10-2015 дата публикации

METHOD FOR REGULATING THE SPEED OF A CLAMPING AND LIFTING DEVICE

Номер: AP0201508824D0
Принадлежит:

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25-11-1996 дата публикации

Control device for hydraulic working cylinders

Номер: AT0000401675B
Автор:
Принадлежит:

Control device for hydraulic working cylinders, having a hydraulic-medium pump 3, which is driven by a motor 2 and is connected to a medium supply 4 and via pump lines 9, 9' to the two chambers 1', 1'' of the working cylinder 1. In this case, the pump is a reversible pump, and a shuttle valve 10, via which the line can be connected to the hydraulic-medium supply, and a non-return valve 11 are connected in series in each of the two pump lines. Furthermore, the non-return valve connected in the pump line connected to the cylinder chamber on the piston-base side is designed as a controllable non-return valve, and the two cylinder chambers can be connected to one another directly via a short-circuit line 15 provided with a valve 15'. ...

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15-02-2007 дата публикации

DEVICE FOR THE CONTROL OF HYDRAULIC POWER SUPPLY UNITS

Номер: AT0000352724T
Принадлежит:

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10-08-1990 дата публикации

FLUESSIGKEITSKREISLAUF FUER EINE HYDRODYNAMISCHE KUPPLUNG

Номер: AT0000391003B
Автор:
Принадлежит:

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15-02-2021 дата публикации

Kompakter hydraulischer Ventilmechanismus für eine längenverstellbare Pleuelstange

Номер: AT522793A4
Принадлежит:

Die vorliegende Erfindung betrifft einen hydraulischen Ventilmechanismus (1; 1‘) zum Öffnen und Schließen einer zu einer Druckkammer führenden Hydraulikleitung, insbesondere einer zu einer Hochdruckkammer (31, 32) einer längenverstellbaren Pleuelstange führenden Hydraulikleitung (35, 36), mit einem Zulaufventil (2, 2‘) und einem Ablassventil (3, 3‘). Es ist die Aufgabe der vorliegenden Erfindung, einen hydraulischen Ventilmechanismus bereitzustellen, der die Stabilität der aus dem Stand der Technik bekannten längenverstellbaren Pleuelstangen erhöht. Hierzu ist erfindungsgemäß vorgesehen, dass das Zulaufventil (2, 2‘) und das Ablassventil (3, 3‘) in einer gemeinsamen Gehäuseeinheit (4) angeordnet sind und die Gehäuseeinheit (4) in die Hydraulikleitung (35, 36) einsetzbar ausgestaltet ist.

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27-03-2000 дата публикации

STEUERANORDNUNG FÜR EINEN ARBEITSZYLINDER

Номер: AT0000003017U3
Автор: KURZ MANFRED
Принадлежит:

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15-03-1984 дата публикации

DEVICE FOR THE SPEED DECREASE OF A PISTON IN A CYLINDER.

Номер: AT0000006539T
Принадлежит:

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15-02-1993 дата публикации

HYDRAULIC VALVE.

Номер: AT0000085674T
Принадлежит:

Подробнее
15-07-1986 дата публикации

SPEED-STEERED DEVICE FOR CUTTING OUT AND REMOVING FROM BLOCKS FROM A SILO FODDER STICK.

Номер: AT0000020415T
Принадлежит:

Подробнее
15-11-2006 дата публикации

CONTROL VALVE UNIT FOR A HYDRAULIC ELEVATOR

Номер: AT0000343079T
Принадлежит:

Подробнее
25-10-1972 дата публикации

Electrohydraulical actuator

Номер: AT0000302760B
Автор:
Принадлежит:

Подробнее
15-03-1996 дата публикации

STEUEREINRICHTUNG FÜR HYDRAULISCHE ARBEITSZYLINDER

Номер: ATA73489A
Автор:
Принадлежит:

Подробнее
15-12-2000 дата публикации

HYDRAULIC CONTROL DEVICE

Номер: AT0000197984T
Принадлежит:

Подробнее
15-12-2004 дата публикации

CONTROL DEVICE FOR A HYDRAULIC MOTOR

Номер: AT0000283428T
Принадлежит:

Подробнее
15-10-2000 дата публикации

HYDRAULIC SYSTEM

Номер: AT0000196674T
Автор: LINK HELMUT, LINK, HELMUT
Принадлежит:

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15-06-2000 дата публикации

Соntrоl dеviсе fоr hуdrаuliс wоrking суlindеrs

Номер: AT00032058915B
Автор:
Принадлежит:

Соntrоl dеviсе fоr hуdrаuliс wоrking суlindеrs, hаving а hуdrаuliс-mеdium pump 3, whiсh is drivеn bу а mоtоr 2 аnd is соnnесtеd tо а mеdium supplу 4 аnd viа pump linеs 9, 9' tо thе twо сhаmbеrs 1', 1'' оf thе wоrking суlindеr 1. In this саsе, thе pump is а rеvеrsiblе pump, аnd а shuttlе vаlvе 10, viа whiсh thе linе саn bе соnnесtеd tо thе hуdrаuliс-mеdium supplу, аnd а nоn-rеturn vаlvе 11 аrе соnnесtеd in sеriеs in еасh оf thе twо pump linеs. Furthеrmоrе, thе nоn-rеturn vаlvе соnnесtеd in thе pump linе соnnесtеd tо thе суlindеr сhаmbеr оn thе pistоn-bаsе sidе is dеsignеd аs а соntrоllаblе nоn-rеturn vаlvе, аnd thе twо суlindеr сhаmbеrs саn bе соnnесtеd tо оnе аnоthеr dirесtlу viа а shоrt-сirсuit linе 15 prоvidеd with а vаlvе 15'. ...

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16-11-2000 дата публикации

DEVICE FOR THE CONTROL OF HYDRAULIC POWER SUPPLY UNITS

Номер: AT00032661961T
Принадлежит:

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09-02-2012 дата публикации

Hydraulic circuit with multiple pumps

Номер: US20120031087A1
Принадлежит: Individual

A hydraulic circuit includes at least one actuator that may be powered for performing a function. A plurality of valves are associated with the at least one actuator for controlling a flow of fluid into and out of the at least one actuator. The hydraulic circuit also includes multiple pumps for supplying fluid to the at least one actuator. The multiple pumps includes a first pump for primarily powering the at least one actuator for movement in a first direction and a second pump for primarily powering the at least one actuator for movement in a second direction, opposite the first direction.

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19-04-2012 дата публикации

Kinematic control in a hydraulic system

Номер: US20120090310A1
Принадлежит: HUSKY INJECTION MOLDING SYSTEMS LTD

A hydraulic system is provided, having a pump, operably connected to a motor. It also comprises a controller-driven hydraulic actuator, operably connected to the pump and a hydraulic valve, operable to direct hydraulic fluid to and from either a rod side or a cylinder side of the hydraulic actuator. Rod and cylinder side pressures are pre-defined based on the instantaneous acceleration or deceleration required. Decelerating the hydraulic actuator could involve maintaining the current pressure in the meter-out side of the hydraulic actuator and decreasing the current pressure in the meter-in side by varying the speed of the pump. Deceleration of the hydraulic actuator could also include decreasing pressure on the meter-in side of the hydraulic actuator at a higher rate than on the meter-out side. Acceleration is achieved using a similar approach.

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30-08-2012 дата публикации

Charge bypass system for engine start

Номер: US20120220426A1
Принадлежит: Deere and Co

The present invention provides an engine start system in a vehicle. The engine start system includes an engine and a charge system. The vehicle also includes an engine speed sensor for measuring a speed of the engine. The charge system is coupled to the engine and includes a charge pump. The vehicle further includes a control unit and a temperature sensor for sensing a temperature of fluid in the charge system. The temperature sensor is electrically coupled to the control unit. A bypass system is fluidly coupled to the charge system and includes a valve and a solenoid. The solenoid is electrically coupled to the control unit such that the control unit energizes the solenoid to control the valve in response to the speed measured by the speed sensor and the temperature sensed by the temperature sensor.

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07-02-2013 дата публикации

Transporter vehicle

Номер: US20130035828A1
Принадлежит: HITACHI CONSTRUCTION MACHINERY CO LTD

A control valve device comprises two direction control valves. The direction control valve includes an expansion side variable throttle portion and a contraction side variable throttle portion. The direction control valve includes an expansion side variable throttle portion and a contraction side variable throttle portion. When a hoist cylinder is telescopically operated to raise or lower a vessel, as the hoist cylinder ( 10 ) approaches a stop position, a controller determines that the hoist cylinder gets close to the stop position. Based upon this determination, the controller variably adjusts a flow passage area of the direction control valve using the variable throttle portions or variably adjusts a flow passage area of the direction control valve using the variable throttle portions in such a manner as to slow down or speed up the telescopic speed of the hoist cylinder corresponding to the weight in the side of vessel.

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04-04-2013 дата публикации

Meterless hydraulic system having multi-actuator circuit

Номер: US20130081704A1
Автор: Patrick Opdenbosch
Принадлежит: Caterpillar Inc

A hydraulic system is disclosed. The hydraulic system may have a pump, a first actuator, and a meterless circuit connecting the first actuator to the pump. The hydraulic system may also have a second actuator connected to the meterless circuit in parallel with the first actuator. The second actuator may be a variable-area linear actuator

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25-04-2013 дата публикации

Booster for a Digital Hydraulic Controller and Method for Using a Booster in Connection with a Digital Hydraulic Controller

Номер: US20130098461A1
Автор: Suomi Eero, Toppari Juhani
Принадлежит: METSO PAPER, INC.

A booster for a digital hydraulic controller which has at least one digital valve (). The booster is connected to a magnetic coil () of a valve stem () of the digital valve () by at least two voltages () wherein one voltage () is higher than the other voltage (). The invention also relates to a method for using a booster in connection with a digital hydraulic controller. 1. A group of digital hydraulic valves and a controller , comprising:a control signal source;at least two digital valves, each digital valve having:a magnetic coil arranged to move a valve stem from a closed position to an open position;a booster in signal receiving relation to the control signal source;a current supply which supplies at least two currents each at different potential voltages, thus forming a first current supply with a first voltage potential which is higher than a second voltage potential of a second current supply;wherein the booster has a pulse former, a first semiconductor switch, a second semiconductor switch, and a connection to ground;wherein the pulse former is in control signal receiving relation to the control signal source;wherein the first semiconductor switch is connected in pulse receiving relation to the pulse former so that when the first semiconductor switch receives a pulse, the first semiconductor switch switches the first current supply at the first voltage potential to a current supplying relation to the coil during the pulse so as to open the valve; andwherein the second semiconductor switch is in control signal receiving relation to the control signal source and arranged to connect the second current source at the second voltage potential in current supplying relation to the coil.2. The apparatus of wherein the first and second semiconductor switches are arranged to drain current from the coil to close the valve.3. The apparatus of wherein the booster further comprises a booster card and the current supplies.4. The apparatus of wherein the current supply first ...

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13-06-2013 дата публикации

Hydraulic control system

Номер: US20130145757A1
Принадлежит: Toyota Motor Corp

A hydraulic control system comprises: a regulator valve, which regulates a fluid pressure established by an oil pump to an operating pressure required in a control circuit; a signal pressure establishing valve, which applies a signal pressure to the regulator valve to determine a level of the fluid pressure to be established by the regulator valve; and an accumulator, which accumulates the operating pressure to be applied to the control circuit. The hydraulic control system is characterized by: an accumulator control valve, which is arranged between the accumulator and the control circuit, and which is adapted to connect the accumulator with the control circuit when opened, and to disconnect the accumulator from the control circuit when closed; and a signal pressure feeding passage, which delivers the signal pressure established by the signal pressure establishing valve to a signal pressure port of the accumulator control valve thereby actuating the accumulator control valve in accordance with the signal pressure.

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13-06-2013 дата публикации

ELECTROHYDRAULIC CONTROL DEVICE

Номер: US20130145926A1
Принадлежит: ROBERT BOSCH GMBH

An electrohydraulic control device and a method for actuating such an electrohydraulic control device include a hydraulic consumer having an actuator element and a pressure medium source that is quantity-adjustable. The speed of the actuator element is controlled by the pressure medium source and the position of the actuator is controlled by digital hydraulics. 1. An electrohydraulic control device for activating an actuator element of a hydraulic consumer , comprising:one or more of a pressure medium source and a tank, the pressure medium source being quantity-adjustable;a controller having a setpoint value input for one or more of a speed and a position of the actuator element;a valve arrangement having valves with a switching characteristic, the valves being actuated in a pulsed fashion by the controller;a plurality of pressure medium connections configured to be connected via the valve arrangement to the pressure medium source or the tank, the valve arrangement being embodied in such a way that each connection is assigned at least one outflow valve that controls a fluid connection between this connection and the tank; anda position transducer configured to sense the position of the actuator element and generate a corresponding position signal to be applied to the controller, the controller having an input configured to receive the position signal and an output configured to predefine a pressure medium quantity to the pressure medium source,wherein the controller forms an adjustment signal from the signal at the setpoint value input and the position signal that corresponds essentially to a speed presetting of the hydraulic consumer, andwherein the controller has a logic circuit which feeds (i) either a pulsed actuation signal formed from the adjustment signal or a predefined actuation signal to at least one outflow valve and (ii) either an actuation signal formed from the adjustment signal or a predefined actuation signal to the pressure medium source.2. The ...

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13-06-2013 дата публикации

Door actuator comprising means for setting to atmospheric pressure in a rapid manner at the end of opening the door

Номер: US20130145928A1
Принадлежит: Ratier Figeac SAS

An aircraft door actuator, including: a pneumatic cylinder for the opening of the door including a chamber into which a pressurized gas is injected via a first port, means for supplying the chamber of the cylinder with pressurized gas, via a supply pipe and said first port, means for setting the chamber to atmospheric pressure when the piston is in the position for opening the door, so as to allow said door to be moved into the closing position, including: a pressurized gas exhaust pipe a gate-valve means for guiding the opening of the gate-valve via the pressurized fluid located in the chamber when the door is in the opening position, so as to open the exhaust pipe in order to set said chamber of the cylinder to atmospheric pressure in a rapid manner once the door is open.

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20-06-2013 дата публикации

Speed Control Strategy

Номер: US20130152569A1
Автор: SPIEKER Arnold H.
Принадлежит: KELSEY-HAYES COMPANY

A method for efficiently decelerating a vehicle having front and rear wheel brakes by isolating the rear wheel brakes and applying pressurized brake fluid only to the front wheel brakes. 1. A method for efficiently decelerating a vehicle having a braking circuit for braking a set of brake actuators , the method comprising the steps of:(a) providing an electronic vehicle braking system having at least one brake circuit for supplying pressurized brake fluid to vehicle brake actuators, each of the brake actuators associated with a wheel brake;(b) sensing braking forces being applied to the wheels associated with the vehicle brake actuators during a bake activation;(c) comparing the sensed forces;(c) isolating the brake actuator associated with the lowest braking force with at upon detection of a need for rapid vehicle speed reduction; and(c) generating a flow of pressurized brake fluid for the brake actuators associated with the non-isolated vehicle brakes.2. The method according to wherein step (c) includes isolating a plurality of brake actuators associated with the lower braking forces.3. The method according to further including claim 2 , subsequent to step (c) claim 2 , removing the isolation of the isolated brake actuators upon determining that a specific criteria associated with stopping the vehicle has been met and then applying pressured brake fluid to the brake actuators associated with rear vehicle brakes.4. A method for efficiently decelerating a vehicle having a braking circuit for braking a set of brake actuators claim 2 , the method comprising the steps of:(a) providing an electronic vehicle braking system having at least one brake circuit for supplying pressurized brake fluid to front and rear vehicle brake actuators;(b) isolating the brake actuators associated with rear vehicle brakes upon detection of a need for rapid vehicle speed reduction; and(c) generating a flow of pressurized brake fluid for the brake actuators associated with the front vehicle ...

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07-11-2013 дата публикации

Method for controlling a movement of a vehicle component

Номер: US20130297155A1
Автор: Andreas Ekvall, Bo Vigholm
Принадлежит: VOLVO CONSTRUCTION EQUIPMENT AB

A method is provided for controlling movement of a first vehicle component relative to a second vehicle component, including the steps of determining a deceleration rate of the first vehicle component in order to achieve a predetermined final speed at a final position, determining a starting position for initiating the deceleration on the basis of the predetermined final speed, the final position and the determined deceleration rate and controlling deceleration of the component from the starting position to the final position according to the determined acceleration rate.

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06-03-2014 дата публикации

HYDRAULIC CONTROL SYSTEM HAVING ELECTRONIC FLOW LIMITING

Номер: US20140060025A1
Принадлежит: CATERPILLAR INC.

A hydraulic control system is disclosed for use with a machine. The hydraulic control system may have a tank, a pump, an actuator, and a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank. The hydraulic control system may also have a pressure sensor to generate a first signal indicative of a pressure differential across the control valve, an operator input device to generate a second signal indicative of a desired movement of the actuator, and a controller. The controller may be configured to make a first determination of an opening amount of the control valve based on the second signal, and to make a second determination based on the first signal of whether the opening amount will result in overspeeding of the actuator. The controller may also be configured to reduce the opening amount based on the second determination. 1. A hydraulic control system , comprising:a tank;a pump configured to draw fluid from the tank and pressurize the fluid;an actuator;a control valve configured to selectively direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator;at least one pressure sensor configured to generate a first signal indicative of a pressure differential across the control valve;an operator input device movable to generate a second signal indicative of a desired movement of the actuator; and make a first determination of an opening amount of the control valve based on the second signal;', 'make a second determination based on the first signal of whether the opening amount will result in overspeeding of the actuator; and', 'selectively reduce the opening amount based on the second determination., 'a controller in communication with the control valve, the at least one pressure sensor, and the operator input device, the controller being configured to2. The hydraulic control system of claim 1 , wherein the controller is further configured to selectively increase the opening ...

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02-01-2020 дата публикации

Forklift and Fork Control Method

Номер: US20200002144A1
Автор: KIMURA Harukazu
Принадлежит:

A forklift includes forks, cylinders for causing the forks to perform an ascending/descending operation in accordance with the flow rate of hydraulic oil, a first valve for controlling the flow rate of the hydraulic oil in accordance with an energizing current, a second valve 6 for regulating the flow rate of the hydraulic oil in accordance with cylinder pressure, and a control portion that calculates the flow rate to be regulated by the second valve, on the basis of cylinder pressure detected by a pressure sensor, calculates a current command value for the energizing current, with the flow rate to be controlled by the first valve being set equal to the regulated flow rate, and changes the energizing current in two stages, with the current command value as the upper limit of the energizing current, thereby decelerating the forks in two stages when stopping the ascending/descending operation. 1. A forklift comprising:forks for holding a load;cylinders for causing the forks to perform an ascending/descending operation at an ascending/descending speed in accordance with a flow rate of hydraulic oil;a first valve for controlling the flow rate of hydraulic oil in accordance with an energizing current;a second valve for regulating the flow rate of hydraulic oil between the cylinders and the first valve in accordance with cylinder pressure on the cylinders;a control portion for supplying the energizing current to the first valve;an operating portion for stopping the ascending/descending operation; anda pressure sensor for detecting the cylinder pressure, wherein,the control portion calculates the flow rate to be regulated by the second valve based on the cylinder pressure,the control portion calculates a current command value for the energizing current, with the flow rate to be controlled by the first valve being set equal to the regulated flow rate, and the control portion changes the energizing current in two stages, with the current command value being set as an upper ...

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07-01-2016 дата публикации

Hydraulic system for construction machine, provided with protection device

Номер: US20160003265A1
Принадлежит: VOLVO CONSTRUCTION EQUIPMENT AB

A hydraulic system for a construction machine having a protection device is disclosed, which can limit a flow rate of hydraulic fluid that is discharged from a hydraulic pump in accordance with a hydraulic fluid temperature and notify an operator of information on the hydraulic fluid temperature. The hydraulic system for a construction machine includes a hydraulic actuator operated by hydraulic fluid that is supplied from a hydraulic pump; a control valve installed in a flow path between the hydraulic pump and the hydraulic actuator to control a flow rate of the hydraulic fluid that is supplied from the hydraulic pump to the hydraulic actuator; an oil cooler installed in a return flow path from the control valve to an hydraulic fluid tank to cool the hydraulic fluid; a hydraulic fluid temperature sensor detecting in real time a hydraulic fluid temperature of the hydraulic fluid tank; a hydraulic pump regulator controlling a discharge flow rate of the hydraulic pump through adjustment of an inclination angle of a swash plate of the hydraulic pump; and a controller comparing the hydraulic fluid temperature detected by the hydraulic fluid temperature sensor with a predetermined hydraulic fluid temperature, and outputting a control signal to the hydraulic pump regulator so as to limit the discharge flow rate of the hydraulic pump to or below a predetermined flow rate if the detected hydraulic fluid temperature is equal to or lower than a predetermined lower limit value, or equal to or higher than a predetermined upper limit value.

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07-01-2016 дата публикации

WORK MACHINE

Номер: US20160003266A1
Принадлежит:

A work machine is adapted for reduced fuel consumption in regions where swinging by a hydraulic motor is prone to deterioration in efficiency, such as when the operating stroke of the swinging is small. The work machine includes an engine, a hydraulic pump, a swing structure, an electric motor for driving the swing structure, and a hydraulic motor for driving the swing structure, the hydraulic motor being driven by the hydraulic pump, and includes a swing control lever device that commands the swing structure to be driven. A control device operates in either an electric swing mode in which the swing structure is driven mainly by torque of the electric motor or a hydraulic swing mode in which the swing structure is driven mainly by torque of the hydraulic motor, depending on an operating stroke of the control lever device and/or a swing speed of the swing structure. 1. A work machine comprising:an engine;a hydraulic pump driven by the engine;a swing structure;an electric motor for driving the swing structure;a hydraulic motor for driving the swing structure, the hydraulic motor being driven by the hydraulic pump; anda swing control lever device that commands the swing structure to be driven,wherein the work machine further comprises a control device operates in either an electric swing mode in which the swing structure is driven mainly by torque of the electric motor or a hydraulic swing mode in which the swing structure is driven mainly by torque of the hydraulic motor, depending on an operating stroke of the control lever device and/or a swing speed of the swing structure.2. The work machine according to claim 1 , further comprising:a swing control lever operating stroke detection device that detects a swing operating stroke of the swing control lever device; anda swing speed detection device that detects the swing speed of the swing structure,wherein the control device acquires the swing operating stroke of the swing control lever device detected by the swing ...

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02-01-2020 дата публикации

METHODS AND APPARATUS TO ENABLE BOOM BOUNCE REDUCTION AND PREVENT UN-COMMANDED MOTION IN HYDRAULIC SYSTEMS

Номер: US20200003239A1
Принадлежит: Eaton Intelligent Power Limited

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic actuator (), first and second counter-balance valves (), first and second independent control valves (), and first and second blocking valves (). The actuator includes first and second corresponding chambers. In a first mode, the second counter-balance valve is opened by the first control valve, and the first counter-balance valve is opened by the second control valve. In a second mode, at least one of the counter-balance valves is closed. A meter-out control valve () may be operated in a flow control mode, and/or a meter-in control valve () may be operated in a pressure control mode. Boom dynamics reduction may occur while the boom is in motion (e.g., about a worksite). By opening the counter-balance valves, sensors at the control valves may be used to characterize external loads. The control valves may respond to the external loads and at least partially cancel unwanted boom dynamics. The system may further detecting faults in actuators with counter-balance valves and prevent any single point fault from causing a boom falling event and/or mitigate such faults. 142.-. (canceled)43. A method of controlling a hydraulic actuator hydraulically coupled to a pair of counter-balance valves , the method comprising:providing the hydraulic actuator, the hydraulic actuator including a pair of chambers hydraulically coupled to the pair of counter-balance valves;providing a pair of control valves hydraulically coupled to the pair of counter-balance valves;operating one of the pair of control valves in a pressure control mode;operating the other of the pair of control valves in a flow control mode;transferring hydraulic fluid flow with the pair of control valves to/from the hydraulic actuator via the pair of counter-balance valves; andsending a first control signal to one of the pair of control valves and a second control signal to the ...

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14-01-2016 дата публикации

Self-snubbing hydraulic actuation system

Номер: US20160010662A1
Принадлежит: Honeywell International Inc

A self-snubbing hydraulic actuation system includes a hydraulic motor, a component actuator, a control valve, a valve actuator, and a variable resistance device. The hydraulic motor is configured, upon receipt of hydraulic fluid, to rotate and supply a drive torque. The component actuator is configured, upon receipt of drive torque from the motor, to translate to a position. The control valve is movable to a plurality of valve positions to thereby control hydraulic fluid flow rate to the hydraulic motor. The valve actuator is coupled to the control valve and is adapted to receive electrical current and to move the control valve to a valve position based on the magnitude of the received electrical current. The variable resistance device is configured, based on component actuator position, to selectively vary the magnitude of the electrical current received by the valve actuator.

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14-01-2021 дата публикации

CONTROL METHOD AND SYSTEM FOR USING A PAIR OF INDEPENDENT HYDRAULIC METERING VALVES TO REDUCE BOOM OSCILLATIONS

Номер: US20210010490A1
Принадлежит: Eaton Intelligent Power Limited

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic cylinder (), first and second counter-balance valves (), and first and second control valves (). A net load () is supported by a first chamber () of the hydraulic cylinder, and a second chamber () of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response () that counters environmental vibrations () on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open. 120.-. (canceled)21. A hydraulic system comprising:a hydraulic cylinder;a first control valve fluidly connected to the hydraulic cylinder; anda controller in communication with the first control valve, the controller being adapted to transmit move signals to the control valve that causes the hydraulic cylinder to extend and/or retract, and the controller being adapted to transmit a vibration signal to the first control valve to produce a fluctuating pressure that causes the hydraulic cylinder to produce a vibratory response.22. The hydraulic system of claim 21 , further comprising:a second control valve fluidly connected to the hydraulic cylinder, wherein the first control valve is fluidly connected to a first chamber of the hydraulic cylinder and the second control valve is fluidly connected to the second chamber of the hydraulic cylinder.23. The hydraulic system of claim 22 , wherein the first and second control valves being independently operable with respect to each other.24. The hydraulic system of claim 21 , wherein when a net load is supported by the first chamber of the hydraulic cylinder claim 21 , and wherein when vibration control is active claim 21 , a fluctuating pressure is transmitted from the second control valve to cause the hydraulic cylinder to produce a vibratory response.25 ...

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09-01-2020 дата публикации

Hydraulic Work Machine

Номер: US20200011030A1
Принадлежит:

A hydraulic work machine is provided which can improve the finishing accuracy in a horizontally leveling work, a slope face shaping work and so forth by preventing sudden acceleration of an arm when the excavation load decreases suddenly. The hydraulic work machine includes an arm velocity-control valve device capable of adjusting a meter-out opening of the arm cylinder independently of a first arm directional control valve . A controller is configured to control, when correcting and increasing an operation amount instructed by the first arm directional control valve, the arm velocity-control valve device to decrease the meter-out opening of the arm cylinder in response to the increase of load pressure of the arm cylinder. 1. A hydraulic work machine , comprising:a work device including a boom and an arm;a boom cylinder that drives the boom;an arm cylinder that drives the arm;a hydraulic operating fluid tank;a first hydraulic pump;a first boom directional control valve that controls a flow rate and a direction of hydraulic fluid to be supplied from the first hydraulic pump to the boom cylinder;a first arm directional control valve that controls a flow rate and a direction of hydraulic fluid to be supplied from the first hydraulic pump to the arm cylinder;a boom operation device that gives instructions on an operation amount of the first boom directional control valve;an arm operation device that gives instructions on an operation amount of the first arm directional control valve;a boom load pressure sensor that detects a load pressure of the boom cylinder;an arm load pressure sensor that detects a load pressure of the arm cylinder; and the hydraulic work machine further comprises an arm velocity-control valve device capable of adjusting a meter-out opening of the arm cylinder independently of the first arm directional control valve, and', 'the controller is configured to control, when correcting and increasing the operation amount instructed by the arm operation ...

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21-01-2016 дата публикации

REGENERATIVE CIRCUIT OF HYDRAULIC APPARATUS

Номер: US20160017897A1
Принадлежит:

An object of the present invention is to solve such problems associated with installing of a spool-type regenerative valve, in that an overall installation space of a hydraulic valve increases and processing that requires accuracy becomes complex. A regenerative circuit includes: a regenerative oil path provided in a valve body of a direction switching valve so as to connect a supply oil path connected to one side of a hydraulic actuator and a discharge oil path connected to the other side; and a regenerative valve which is a poppet-type flow regulating valve that is screwed into and attached to the valve body so as to control the flow of oil in the regenerative oil path according to an operation state of the direction switching valve.

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21-01-2016 дата публикации

MERGING CIRCUIT OF HYDRAULIC APPARATUS

Номер: US20160017898A1
Принадлежит:

An object of the present invention is to solve such problems associated with a merging circuit using a pair of spool-type direction switching valves, in that the installation space of a hydraulic valve device increases and the processing that requires accuracy becomes complex. A merging circuit includes a direction switching valve that merges oil discharged from first and second pumps to supply the oil to an actuator; and a controller. The direction switching valve includes a central bypass oil path connected to the discharge oil paths of the first and second pumps, a first parallel supply oil path connected to the discharge oil path of the first pump, and a second parallel supply oil path connected to the discharge oil path of the second pump and connected to a first parallel oil path via a poppet-type flow regulating valve. The poppet-type flow regulating valve regulates the flow rate to a predetermined magnitude according to a signal of the controller.

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21-01-2016 дата публикации

PRESSURE LOSS REDUCING CIRCUIT FOR A WORKS MACHINE

Номер: US20160017901A1
Принадлежит:

A pressure loss reducing circuit reduces a pressure loss of oil returning from an actuator to a direction switching valve with a simple configuration while suppressing an increase in the manufacturing cost and substantially eliminating the need of an additional installation space. The pressure loss reducing circuit includes a bypass valve disposed between an actuator oil path and a tank oil path of a direction switching valve, and opened and closed according to a signal from a controller, and moreover screwed into and attached to the direction switching valve. According to an operation signal of a switching spool when oil returning from an actuator is caused to flow to the actuator oil path, the controller opens the bypass valve so that the actuator oil path and the tank oil path communicate with each other and supplies the returning oil to the switching spool and the bypass valve to reduce a pressure loss.

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10-02-2022 дата публикации

Construction Machine

Номер: US20220042279A1
Принадлежит: HITACHI CONSTRUCTION MACHINERY CO LTD

To make it possible to prevent a decrease in work speed due to a decrease in the speed of a given actuator when an operator unintentionally performs a fine operation of the control lever of the other actuator in a state in which the given actuator is driven by the hydraulic fluid delivered from a plurality of pumps, a controller ( 41 ) sets, as a composite dead zone line serving as a boundary of a composite dead zone, a composite dead zone line such that as an operation amount in one direction of a control lever ( 12 L) or ( 13 L) of a control lever device ( 12 ) or ( 13 ) is increased, the width of the composite dead zone corresponding to an operation amount in the other direction of the control lever is widened, and corrects the operation amount in the other direction such that the demanded flow rate of an actuator increases from zero, when the control lever is operated in the other direction in a state in which the operation amount in the one direction of the control lever remains within a range of the composite dead zone, and the operation amount in the other direction exceeds the composite dead zone line.

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24-01-2019 дата публикации

EXCAVATOR AND CONTROL VALVE FOR EXCAVATOR

Номер: US20190024343A1
Автор: MISAKI Youji
Принадлежит:

An excavator includes a lower travelling body; an upper turning body mounted on the lower travelling body; an engine installed in the upper turning body; a hydraulic pump connected to the engine; a hydraulic actuator driven by hydraulic oil discharged by the hydraulic pump to move a work element; a first control valve configured to control a flow rate of the hydraulic oil flowing from the hydraulic pump to the hydraulic actuator; a second control valve configured to control a flow rate of the hydraulic oil flowing from the hydraulic actuator to a hydraulic oil tank; and a control device configured to control opening and closing of the second control valve. 1. An excavator comprising:a lower travelling body;an upper turning body mounted on the lower travelling body;an engine installed in the upper turning body;a hydraulic pump connected to the engine;a hydraulic actuator driven by hydraulic oil discharged by the hydraulic pump to move a work element;a first control valve configured to control a flow rate of the hydraulic oil flowing from the hydraulic pump to the hydraulic actuator;a second control valve configured to control a flow rate of the hydraulic oil flowing from the hydraulic actuator to a hydraulic oil tank; anda control device configured to control opening and closing of the second control valve.2. The excavator according to claim 1 , wherein a boom-use first control valve configured to control a flow rate of the hydraulic oil flowing from the hydraulic pump to a boom cylinder, and', 'an arm-use first control valve configured to control a flow rate of the hydraulic oil flowing from the hydraulic pump to an arm cylinder, and, 'the first control valve includes'} a boom-use second control valve configured to control a flow rate of the hydraulic oil flowing from the boom cylinder to the hydraulic oil tank, and', 'an arm-use second control valve configured to control a flow rate of the hydraulic oil flowing from the arm cylinder to the hydraulic oil tank., 'the ...

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24-01-2019 дата публикации

CONTROL DEVICE FOR FLUID PRESSURE ACTUATOR

Номер: US20190024678A1
Автор: Ito Tatsuo
Принадлежит: KYB Corporation

A control device for a fluid pressure actuator includes a first valve controlling a flow of working oil supplied to or discharged from a hydraulic cylinder, a regulation determining portion determining whether to increase or decrease an energization amount to the first valve on the basis of a position deviation between an actual position and a target position of the hydraulic cylinder, a first proportional gain output portion deciding a command current value to be applied to the first valve on the basis of the position deviation, and an offset current output portion setting an offset current value to be applied to the first valve on the basis of a judgment result of the regulation determining portion. The offset current output portion sets a first current value as the offset current value in a valve closing process, and sets a second current value greater than the first current value as the offset current value in a valve opening process. 1. A control device for a fluid pressure actuator for controlling extension and contraction of a fluid pressure actuator , the control device comprising:a detecting portion configured to detect an extending and contracting position of the fluid pressure actuator;a solenoid valve configured to control a flow of working fluid supplied to or discharged from the fluid pressure actuator; and the controller having:', 'a deviation calculation portion configured to calculate a position deviation between an actual position of the fluid pressure actuator detected by the detecting portion and a target position of the fluid pressure actuator;', 'a regulation determining portion configured to determine whether to increase or decrease an energization amount to the solenoid valve on the basis of the position deviation;', 'a command value output portion configured to output a command current value applied to the solenoid valve on the basis of the position deviation; and', 'an offset current output portion configured to set an offset current value ...

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23-01-2020 дата публикации

WORK MACHINE

Номер: US20200024821A1
Принадлежит:

A work machine includes: control valves that control flows of a hydraulic operating oil supplied to actuators; operation lever devices that generate hydraulic signals to be output to the corresponding control valves according to an operation; solenoid proportional valves that reduce pressure of the hydraulic signals generated by the corresponding operation lever devices; and a front implement control section that controls the solenoid proportional valves. The work machine further includes: operation signal lines connected to the operation lever devices; signal input lines connected to the control valves; pressure reducing lines provided with the solenoid proportional valves; and selector valves that have a first position that interrupts connection of the operation signal lines and the pressure reducing lines and directly connects the operation signal lines to the signal input lines, and a second position that connects the operation signal lines to the signal input lines via the pressure reducing lines. 1. A work machine comprising:a machine body;a front work implement provided to the machine body;a plurality of actuators configured to drive the front work implement;a posture sensor configured to detect a posture of the front work implement;a hydraulic pump configured to deliver a hydraulic operating oil that drives the actuators;a plurality of control valves configured to control flows of the hydraulic operating oil supplied from the hydraulic pump to the corresponding actuators;a plurality of operation lever devices configured to generate hydraulic signals to be output to the corresponding control valves according to respective operations;a pilot line configured to connect the operation lever devices to the corresponding control valves;a pilot pump configured to supply a hydraulic operating oil to the operation lever devices;at least one solenoid proportional valve provided to the pilot line, the at least one solenoid proportional valve reducing pressure of one of ...

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04-02-2016 дата публикации

Driving Device for Work Machine

Номер: US20160032565A1
Принадлежит: HITACHI CONSTRUCTION MACHINERY CO LTD

To provide a driving device capable of improving the operability of a plurality of single rod hydraulic cylinders. The present invention takes a construction provided with a closed circuit A in which first and third hydraulic pumps 12, 14 and a boom cylinder 1 are connected through selector valves 43 a, 45 a in a closed-circuit fashion, a plurality of open circuits E, F provided with second and fourth hydraulic pumps 13, 15 and selector valves 44 a, 46 a that switch the supply destinations of hydraulic oils flowing out from the second and fourth hydraulic pumps 13, 15 , and a connection passage 301 connected to sides of the selector valves 44 a, 46 a from which sides hydraulic oil flows out, and connected to the closed circuit A.

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04-02-2016 дата публикации

ROTATIONAL SPEED LIMITATION DEVICE FOR A MOTOR

Номер: US20160032946A1
Принадлежит:

Hydraulic motor for driving a work equipment comprising a hydraulic drive mechanism with a high pressure side and a low pressure side. On the low pressure side a first throttle orifice and a second throttle orifice within a first bypass line bypassing the first throttle orifice are arranged, whereby at least the throttle orifice opening of the second throttle orifice is adjustable. 1. A hydraulic motor for driving a working equipment , with a drive mechanism comprising a high pressure side and a low pressure side whereby on the low pressure side a first throttle orifice and a second throttle orifice within a bypass line which bypasses the first throttle orifice are arranged , whereas at least the orifice opening of the second throttle orifice is adjustable.2. The hydraulic motor according to claim 1 , whose first throttle orifice comprise a fixed orifice opening.3. The hydraulic motor according to claim 1 , in which the second throttle orifice is formed as a metering orifice whose orifice opening claim 1 , can be closed in the manner of a flow control valve against an elastic force by a pressure after the driving mechanism and before the measuring orifice.4. The hydraulic motor according to claim 1 , in which the orifice opening of the second throttle orifice is adjustable by means of an actuator which is operable mechanically claim 1 , hydraulically claim 1 , electrically or pneumatically by means of a control device.5. The hydraulic motor according to claim 1 , whose displacement is adjustable.6. The hydraulic motor according to claim 1 , wherein the hydraulic motor can be operated in both rotational directions.7. The hydraulic motor according to claim 6 , in which on each of both sides of the driving mechanism a first throttle orifice and a second throttle orifice within a bypass line which bypasses the first throttle orifice are arranged claim 6 , whereas at least the orifice opening of each of the second throttle orifices is adjustable and whereby in each of ...

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04-02-2016 дата публикации

SLEWING DRIVE APPARATUS FOR CONSTRUCTION MACHINE

Номер: US20160032949A1
Автор: IZUKA Takaaki, Ueda Koji

Provided is a slewing drive apparatus for a construction machine capable of satisfactory pump-flow-rate control regardless of change in engine speed, including a variable displacement hydraulic pump, a slewing motor, a slewing operation device, a control valve, a relief valve, and a pump-flow-rate control device that performs a relief cut control and includes: a section for detecting an engine revolution number Ne and a slewing speed of a slewing body; a section for determining a target pump flow rate Qo that is a sum of a slewing-speed correspondence flow rate Q and a minimum required relief flow rate Qmin; a section for determining a target pump-tilt-angle qtg obtained by dividing the target pump flow rate Qo by the detected engine revolution number Ne; and a section for adjusting an actual pump-tilt-angle of the hydraulic pump so as to bring the actual pump-tilt-angle to the target pump-tilt-angle qtg. 1. A slewing drive apparatus to be installed on a construction machine including a slewing body to slew the slewing body , the slewing drive apparatus comprising:an engine;a variable displacement hydraulic pump that is driven by the engine to thereby discharge a hydraulic fluid;a slewing motor that slews the slewing body;a slewing operation device that receives an operation for actuating the slewing motor and outputs a slewing command corresponding to the operation;a control valve that makes a valve opening action so as to control the actuation of the slewing motor, in response to the slewing command output by the slewing operation device;a relief valve that defines a maximum pressure of the slewing motor; anda pump-flow-rate control device that controls a pump-tilt-angle determining a pump flow rate that is a discharge flow rate of the hydraulic pump, characterized in that{'b': '1', 'the pump-flow-rate control device performing a relief cut control and including: a section for detecting an engine revolution number Ne and a slewing speed of a slewing body; a ...

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17-02-2022 дата публикации

FLOW CONTROLLER AND DRIVING APPARATUS INCLUDING THE SAME

Номер: US20220049720A1
Принадлежит: SMC Corporation

A flow controller that changes the flow rate of air exhausted from an air cylinder in mid-stroke includes a first switching valve displaced from a first position to a second position under the effect of pilot air, and causing one port of the air cylinder to communicate with a first channel at the first position, exhausting air exhausted from the one port of the air cylinder while reducing the flow rate of the air using a first regulating valve at the second position. Since the pilot air is taken into the first switching valve from a second channel in a system different from the system of the first channel, a second regulating valve can be adjusted without being affected by the degree of opening of the first regulating valve. 1. A flow controller that changes a flow rate of air supplied or exhausted through at least one of a first channel communicating with one port of an air cylinder and a second channel communicating with another port of the air cylinder in midstroke , comprising:a first switching valve configured to be displaced from a first position to a second position under an effect of pilot air, cause the one port of the air cylinder to communicate with the first channel at the first position, and cause the one port of the air cylinder to communicate with an air outlet via a first regulating valve at the second position;a first introduction path configured to guide the pilot air from the second channel to the first switching valve; anda second regulating valve provided for the first introduction path and configured to adjust timing of displacement of the first switching valve by regulating a flow rate of the pilot air.2. The flow controller according to claim 1 , wherein the first regulating valve comprises a throttle valve configured to regulate a flow rate of air exhausted from the one port of the air cylinder.3. The flow controller according to claim 1 , further comprising:a second switching valve configured to be displaced from a first position to a ...

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30-01-2020 дата публикации

Pilot control mechanism for boom bounce reduction

Номер: US20200032820A1
Принадлежит: Eaton Intelligent Power Ltd

A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.

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11-02-2016 дата публикации

DEVICE AND METHOD FOR CONTROLLING HYDRAULIC PUMP IN CONSTRUCTION MACHINE

Номер: US20160040689A1
Принадлежит:

Disclosed are a device and a method for controlling a hydraulic pump in a construction machine, the method including: checking whether a dynamic characteristic of an engine deviates from a predetermined permissible range when a load is applied to the hydraulic pump and a pump load reaches pump torque required by the hydraulic pump; when the dynamic characteristic of the engine deviates from the predetermined permissible range, applying a pump load to the hydraulic pump so as to increase the pump torque to predetermined torque with a predetermined change rate; collecting information which is generated when the pump load is applied; generating a new torque change rate map by generating a torque change rate for each load section based on the information collected in the information collecting step; and updating an existing torque change rate map to the new torque change rate map generated in the map data generating step. 1. A method for controlling a hydraulic pump in a construction machine , the method comprising:an engine dynamic characteristic change checking step of checking whether a dynamic characteristic of an engine deviates from a predetermined permissible range when a load is applied to the hydraulic pump and a pump load reaches pump torque required by the hydraulic pump;a pump load applying step of when the dynamic characteristic of the engine deviates from the predetermined permissible range in the engine dynamic characteristic change checking step, applying a pump load to the hydraulic pump so as to increase the pump torque to predetermined torque with a predetermined change rate;an information collecting step of collecting information including engine speed information, swash plate angle information of the pump, and pressure information of discharged working oil, which is generated when the pump load is applied in the pump load applying step;a map data generating step of generating a new torque change rate map by generating a torque change rate for each ...

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24-02-2022 дата публикации

WORK VEHICLE

Номер: US20220055872A1
Принадлежит:

A work vehicle includes: an operation tool that is operated by an operator; and a controller that determines a target flow rate for hydraulic oil fed to a hydraulic device on a basis of the amount of operation of the operation tool. The controller calculates a bleed-off target flow rate on a basis of the flow rate of hydraulic oil fed from a hydraulic oil pump and the target flow rate for hydraulic oil fed to the hydraulic device, calculates a bleed-off throttle differential pressure on a basis of a pressure of hydraulic oil fed from the hydraulic oil pump and a pressure of hydraulic oil in a hydraulic oil tank, calculates a bleed-off target opening area on a basis of the bleed-off target flow rate and the bleed-off throttle differential pressure, and controls a hydraulic oil control valve such that the bleed-off target opening area is achieved. 1. A work vehicle comprising:a hydraulic device;a hydraulic oil pump;a hydraulic oil tank;a meter-in circuit that guides hydraulic oil from the hydraulic oil pump to the hydraulic device;a meter-out circuit that guides hydraulic oil from the hydraulic device to the hydraulic oil tank;a bleed-off circuit that guides hydraulic oil from the hydraulic oil pump to the hydraulic oil tank without passing through the hydraulic device;a hydraulic oil control valve that adjusts opening areas of the meter-in circuit, the meter-out circuit, and the bleed-off circuit by sliding of a spool;an operation tool operated by an operator; anda controller that determines a target flow rate of hydraulic oil to be fed to the hydraulic device on a basis of an operation amount of the operation tool, whereinthe controller calculates a bleed-off target flow rate on a basis of a flow rate of the hydraulic oil fed from the hydraulic oil pump and a target flow rate of the hydraulic oil fed to the hydraulic device, calculates a bleed-off throttle differential pressure on a basis of a pressure of the hydraulic oil fed from the hydraulic oil pump and a ...

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25-02-2021 дата публикации

ACTUATOR CONTROLLER

Номер: US20210054858A1
Автор: Hart Charles A.
Принадлежит:

A control system for controlling the position of a piston within a cylinder includes a positioner, a digital controller, and one or more solenoid operated valves. The positioner may remain active at all times and contribute to control of the position of the piston. The digital controller may compare the actual position of the piston with a desired position of the piston and identify any deviation therebetween. When the deviation is above a prescribed threshold, the digital control may send a signal to the solenoid operated valve(s) to actuate the solenoid operated valve(s) to rapidly correct the deviation. As the deviation approaches zero, the digital controller may deactivate the solenoid operated valve(s) and the positioner may complete the correction. 1. A control system for positioning a piston , the control system comprising:a cylinder having first and second regions, the cylinder being sized to have at least a portion of the piston located in the cylinder;a pair of positioner pneumatic control lines fluidly connected to respective ones of the first and second regions of the cylinder;a pair of solenoid pneumatic control lines fluidly connected to respective ones of the first and second regions of the cylinder;a compressed air source in fluid communication with the cylinder;a positioner fluidly connected to the compressed air source and fluidly connected to the first and second regions of the cylinder via the pair of positioner pneumatic control lines for regulating flow of compressed air into and out of the first and second regions of the cylinder;a controller capable of receiving a position signal indicative of an actual position of the piston within the cylinder and a control signal indicative of a desired position of the piston within the cylinder, the controller being configured to generate a boost signal when a comparison of the position signal and the control signal indicates a deviation between the actual position and the desired position that is above a ...

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22-02-2018 дата публикации

Hydraulic Control System of Construction Machine

Номер: US20180051444A1
Принадлежит:

Disclosed is a hydraulic control system of a construction machine capable of achieving a reduction in meter-out pressure loss in accordance with variation of a negative load acting on a hydraulic actuator and capable of preventing deterioration in operability even when an abnormal condition arises in a pressure sensor detecting the magnitude of a negative load. There are provided meter-out flow lines through which a hydraulic fluid discharged from a hydraulic actuator flows; variable restrictors provided in the meter-out flow lines; a load sensor detecting the magnitude of a negative load which is a load applied to the hydraulic actuator by an external force and which is a load in the same direction as the operating direction of the hydraulic actuator; and a control device which, when the load abnormality sensor does not detect any abnormality in the load sensor, reduces the sum total of the opening areas of the variable restrictors in accordance with an increase in the magnitude of the negative load detected by the load sensor and the operation amount detected by the operation amount sensor and which, when the load abnormality sensor detects abnormality in the load sensor, reduces the sum total of the opening areas of the variable restrictors to a predetermined value in accordance with the operation amount detected by the operation amount sensor. 1. A hydraulic control system of a construction machine comprising:a hydraulic actuator driven by a hydraulic fluid delivered from a hydraulic pump;one or a plurality of meter-out flow lines through which the hydraulic fluid discharged from the hydraulic actuator flows;one variable restrictor provided in the one meter-out flow line, or a plurality of variable restrictors each provided in the plurality of meter-out flow lines;an operation device outputting an operation command signal for the hydraulic actuator in accordance with an operation amount;an operation amount sensor detecting an operation amount of the operation ...

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15-05-2014 дата публикации

PRESSURE MEDIUM SYSTEM, IN PARTICULAR HYDRAULIC SYSTEM

Номер: US20140130484A1
Принадлежит: Ludwig Ehrhardt GmbH

The invention relates to a pressure medium system, in particular a hydraulic system, having a fluid pump for delivering a drive fluid with a certain delivery flow rate and a certain fluid pressure, and having a control unit which switches the fluid pump on or off in order to set a predefined setpoint value of the fluid pressure, wherein the fluid pump exhibits an inertia-induced overrun when switched off, such that during the overrun of the fluid pump, the fluid pressure still rises while the fluid pump has already been switched off. It is proposed that, during the increase of the fluid pressure to the predefined setpoint value, the control unit switches the fluid pump off before the fluid pressure has reached the predefined setpoint value. The invention also includes a corresponding operating method. 1. A pressure medium system , witha) a fluid pump for conveying a drive fluid with a certain discharge flow and a certain fluid pressure,b) a control unit, which switches the fluid pump on or off to adjust a predefined target value of the fluid pressure,c) wherein the fluid pump has an inertia-induced overrun during shut-off, so that the fluid pressure still rises during the overrun of the fluid pump, while the fluid pump is already switched off,d) wherein the control unit switches off the fluid pump when increasing the fluid pressure to the predefined target value before the fluid pressure has reached the target value.2. The pressure medium system according to claim 1 , whereina) the fluid pressure rises during the overrun after switching off of the fluid pump without any pressure limitation by a certain maximum possible overrun pressure rise, andb) the control unit switches off the fluid pump when the fluid pressure exceeds a certain switch-off pressure.3. The pressure medium system according to claim 2 , whereina) the pressure difference between the predefined target value of the fluid pressure and the switch-off pressure is smaller than the maximum possible overrun ...

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15-05-2014 дата публикации

HYDRAULIC DRIVE SYSTEM

Номер: US20140130487A1
Принадлежит: KOMATSU LTD.

A hydraulic driving system includes a hydraulic pump, a driving source, a hydraulic cylinder, a closed circuit hydraulic path between the pump and cylinder, a pump-flow-rate control unit controlling a discharge flow rate of the pump, a flow rate control valve between the pump and the cylinder in the fluid path, a directional control unit, a target flow rate setting unit and a control device. The directional control unit allows a flow of fluid from the pump to the cylinder and prohibits a flow of fluid from the cylinder to the pump when fluid is supplied from the pump to the cylinder via the flow rate control valve. The control device controls fluid flow to the cylinder with the flow rate control valve when the target flow rate is within a prescribed range, and with the pump-flow-rate control unit when the target flow rate is greater than the prescribed range. 1. A hydraulic driving system comprising:a hydraulic pump;a driving source configured to drive the hydraulic pump;a hydraulic cylinder configured to be driven by hydraulic fluid discharged from the hydraulic pump;a hydraulic fluid path forming a closed circuit between the hydraulic pump and the hydraulic cylinder;a pump-flow-rate control unit configured to control a discharge flow rate of the hydraulic pump;a flow rate control valve disposed between the hydraulic pump and the hydraulic cylinder in the hydraulic fluid path, the flow rate control valve being configured to control a flow rate of hydraulic fluid supplied to the hydraulic cylinder from the hydraulic pump;a directional control unit configured to allow a flow of hydraulic fluid from the hydraulic pump to the hydraulic cylinder and prohibit a flow of hydraulic fluid from the hydraulic cylinder to the hydraulic pump when hydraulic fluid is supplied from the hydraulic pump to the hydraulic cylinder via the flow rate control valve;a target flow rate setting unit configured to set a target flow rate of hydraulic fluid supplied to the hydraulic cylinder; ...

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05-03-2015 дата публикации

BRAKE HYDRAULIC DEVICE FOR VEHICLE

Номер: US20150059334A1
Автор: NAKAMURA Motoyasu
Принадлежит:

Provided is a brake hydraulic device for a vehicle, including: a base body having a hydraulic pressure path for brake fluid formed therein; an electromagnetic valve; an electromagnetic coil; a pressure sensor; and a housing attached to the outer surface of the base body. The housing includes a peripheral wall part and an intermediate wall part partitioning a space inside the peripheral wall part into a front side and a rear side. A plurality of bus bars on the coil side to be electrically connected to the electromagnetic coil, and a plurality of bus bars on the sensor side to be electrically connected to the pressure sensor are embedded in the intermediate wall part. A hierarchy region where the bus bars on the coil side and the bus bars on the sensor side are positioned in a hierarchy state with each other in the front-rear direction is provided. 1. A brake hydraulic device for a vehicle , comprising:a base body having a hydraulic pressure path for brake fluid formed therein;an electromagnetic valve which opens and closes the hydraulic pressure path;an electromagnetic coil which drives the electromagnetic valve;a pressure sensor which detects intensity of the hydraulic pressure of the brake fluid in the hydraulic pressure path; anda housing attached to an outer surface of the base body and having a housing chamber for accommodating the electromagnetic valve, the electromagnetic coil, and the pressure sensor,wherein the housing includes a peripheral wall part having openings formed on a front side and a rear side thereof, and an intermediate wall part partitioning a space inside the peripheral wall part into a front side and a rear side,wherein the housing chamber is provided on the rear side of the intermediate wall part,wherein a plurality of bus bars on the coil side to be electrically connected to the electromagnetic coil, and a plurality of bus bars on the sensor side to be electrically connected to the pressure sensor are embedded in the intermediate wall part ...

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10-03-2022 дата публикации

Hydraulic Power Pack System

Номер: US20220074437A1
Принадлежит:

A hydraulic power pack for use in a hydraulic system includes a reservoir configured to receive hydraulic fluid. A pump is in communication with the reservoir and is fluidly connectable to the hydraulic system. The pump is configured to pump hydraulic fluid from the reservoir into the hydraulic system when connected thereto. A hydraulic fluid sensor is fluidly connectable to the hydraulic system to sense a fluid characteristic of the hydraulic fluid within the hydraulic system. A variable speed drive is operatively coupled to the pump and the hydraulic fluid sensor to receive sensor data therefrom, with the variable speed drive being configured to generate a pump control signal based on the received sensor data. The pump is configured to operate at various speeds based on the pump control signal received from the variable speed drive. 1. A hydraulic power pack for use in a hydraulic system , the hydraulic power pack comprising:a reservoir configured to receive hydraulic fluid;a pump in communication with the reservoir and fluidly connectable to the hydraulic system, the pump being configured to pump hydraulic fluid from the reservoir into the hydraulic system when connected thereto;a hydraulic fluid sensor fluidly connectable to the hydraulic system to sense a fluid characteristic of the hydraulic fluid within the hydraulic system;an electrically driven variable speed drive operatively coupled to the pump and the hydraulic fluid sensor to receive sensor data therefrom, the electrically driven variable speed drive being configured to generate a pump control signal based on the received sensor data; anda user interface in operative communication with the electrically driven variable speed drive and having a communications circuit configured to facilitate bi-directional communication with a remote electronic device;the pump being configured to operate at various speeds based on the pump control signal received from the electrically driven variable speed drive.2. The ...

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20-02-2020 дата публикации

WHEELCHAIR LIFT WITH LOW ENERGY CONSUMPTION

Номер: US20200054506A1
Автор: GALLINGANI Marco
Принадлежит: Autolift S.r.l.

A wheelchair lift with low energy consumption includes a platform assembly to receive a wheelchair. The wheelchair lift includes a hydraulic drive system to move the platform assembly between an entry level position and a ground level position. The wheelchair lift includes a fluid circuit being embodied to transport a hydraulic fluid from a tank using a pump driven by an electric motor to the hydraulic drive system to raise the platform assembly from the ground level position to the entry level position. The fluid circuit is further embodied to transport the hydraulic fluid from the hydraulic drive system via the pump to the tank, when lowering the platform assembly from the entry level position to the ground level position. 1. A wheelchair lift with low energy consumption , comprising:{'b': '10', 'a platform assembly () to receive a wheelchair;'}{'b': 20', '10', '2', '3', '20', '21', '22, 'a lifting assembly () to move the platform assembly () between an entry level position () and a ground level position () which is below the entry level position, wherein the lifting assembly () comprises a hydraulic drive system (, );'}{'b': 100', '110, 'a tank () to provide a hydraulic fluid ();'}{'b': 120', '110', '100', '21', '22, 'a pump () to pump the hydraulic fluid () from the tank () to the hydraulic drive system (, );'}{'b': 130', '120', '130', '130', '130', '120, 'an electric motor () to drive the pump (), wherein the electric motor () comprises a terminal (T) to apply an operating voltage to operate the electric motor () for driving the pump (); and'}{'b': 140', '110', '100', '21', '22', '10', '3', '2, 'a fluid circuit () being embodied to transport the hydraulic fluid () from the tank () to the hydraulic drive system (, ) to raise the platform assembly () from the ground level position () to the entry level position ();'}{'b': 140', '110', '21', '22', '120', '100', '10', '2', '3, 'wherein the fluid circuit () is further embodied to transport the hydraulic fluid () ...

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03-03-2016 дата публикации

HYBRID CONSTRUCTION MACHINE

Номер: US20160061235A1
Автор: Doi Takayuki

A hybrid construction machine detects the voltage of each cell that forms a battery, calculates a difference voltage between the detected voltage and a predetermined upper-limit working voltage, selects the lower one of the calculated difference voltage and a stored difference voltage, corrects an upper-limit working charging rate to decrease as the selected difference voltage decreases, and controls charging of the battery, based on the corrected upper-limit working charging rate. 1. A hybrid construction machine comprising:a hydraulic pump that serves as a hydraulic power source of a hydraulic actuator;a generator motor;an engine that is connected to the hydraulic pump and the generator motor;a power storage device;a generator motor controller that assists the engine by a motor action of the generator motor with the aid of power of the power storage device;a control unit that controls charging and discharging of the power storage device; anda battery monitoring device that detects a voltage of the power storage device, whereinthe control unit includes:a difference voltage calculating unit that calculates a difference voltage, which is a difference between an upper-limit working voltage that is set in advance as an upper limit of a usable voltage of the power storage device, and the voltage of the power storage device detected by the battery monitoring device;a storage unit that stores the difference voltage;an updating unit that updates the difference voltage which stored by the storage unit by selecting the lower one of the calculated difference voltage and the stored difference voltage stored in the storage unit;a correcting unit that corrects an upper-limit working charging rate, which is set in advance as an upper limit of a charging rate usable for the power storage device, to decrease as the selected difference voltage decreases; anda charging/discharging control unit that controls charging of the power storage device, based on the corrected upper-limit ...

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22-05-2014 дата публикации

HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY

Номер: US20140137549A1
Автор: Bae Sang-Ki, Go Joon-Seog
Принадлежит: VOLVO CONSTRUCTION EQUIPMENT AB

Disclosed is a hydraulic system for controlling the degree of openness of an arm regeneration valve by driving an electronic proportional control valve during a combined operation of simultaneously operating an arm and a swing device. The hydraulic system for construction machinery according to the present invention is characterized by comprising: a hydraulic pump; a control valve for controlling the discharge flow from the hydraulic pump; an arm cylinder and a swing motor, each connected to the hydraulic pump; an arm controlling device and a swing controlling device; a pressure detecting means for the hydraulic pump; a controlled amount detecting means for the arm controlling device; a controlled amount detecting means for the swing controlling device; an arm control valve for controlling the driving of the arm cylinder; a swing control valve for controlling the driving of the swing motor; an arm regeneration valve for controlling the pressure at an upstream return passage of the arm control valve when the arm naturally descends; an electronic proportional control valve for outputting a signal voltage for switching the arm regeneration valve; and a controller for performing a control so as to generate a secondary signal voltage by outputting electrical control signals to both the control valve and the electronic proportional control valve so as to correspond to detection signals inputted from the pressure detecting means and controlled amount detecting means. 1. A hydraulic system for a construction machine comprising:a variable displacement hydraulic pump;a control valve driven in response to an electric control signal applied thereto and configured to control a flow rate of a hydraulic fluid discharged from the hydraulic pump;an arm cylinder and a swing motor respectively connected to the hydraulic pump;an arm manipulation device and a swing manipulation device configured to output a control signal according to an manipulation amount thereof, respectively;a ...

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04-03-2021 дата публикации

VALVE ARRANGEMENT FOR PRESSURE MEDIUM SUPPLY OF A HYDRAULIC CONSUMER

Номер: US20210062832A1
Принадлежит:

A valve arrangement for pressure medium supply of a hydraulic consumer according to the invention, wherein said valve arrangement has two utility ports (A, B) for fluid connection to the consumer, 1. A valve arrangement for pressure medium supply of a hydraulic consumer , wherein said valve arrangement has two utility ports (A , B) for fluid connection to the consumer , [{'b': 24', '10', '26', '28', '10', '24, 'has a first intake (), via which a first intake flow from the first utility port (A) to the consumer () is controllable, and having a first return control orifice (), via which a first return flow () from the consumer () via the second utility port (B) is controllable simultaneously with the first intake (), and'}, {'b': 34', '10', '36', '38', '10', '34, 'has a second intake (), via which a second intake flow from the second utility port (B) to the consumer () is controllable, and having a second return control orifice (), via which a second return flow () from the consumer () via the first utility port (A) is controllable simultaneously with the second intake (), and'}], 'having a first control valve, which'}{'b': 40', '42', '24', '34', '20, 'having a second control valve () having an intake control orifice (), which can be used to control the respective intake (, ) of the first control valve ().'}22434. The valve arrangement according to claim 1 , characterized in that the first intake () and/or the second intake () of the first control valve are each free of means for narrowing the flow cross section claim 1 , in particular free of orifices or throttles.3204410. The valve arrangement according to claim 1 , characterized in that the first control valve () is a ¾-way proportional valve operatable by a pilot-pressure regulator claim 1 , preferably a 4/4-way proportional valve claim 1 , permitting in one valve position () a floating position for the connected consumer ().44042243420. The valve arrangement according to claim 1 , characterized in that the second ...

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17-03-2022 дата публикации

Systems and Methods for Operating a Direct Current Hydraulic Pump

Номер: US20220081261A1
Автор: Hassan Karbassi
Принадлежит: KAR-TECH Inc

System and methods for a DC powered hydraulic system capable of providing control over pressurized hydraulic fluid delivered to directional valves without the need for a PTO and/or a proportional valve. The hydraulic system controls the output from a battery to a direct current hydraulic pump.

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10-03-2016 дата публикации

ENGINE SPEED CONTROLLER OF WORK MACHINE

Номер: US20160069282A1

The present invention is to reduce the flow rate of pressure oil discharged from a main pump and returned to a tank when specific work is executed with an operation amount of an operating device being made small in the state in which an engine is kept at an idling speed. According to the present invention, there is provided a main controller () which is capable of controlling the speed of an engine () to a normal work speed at which a work implement such as a boom () can perform normal work and which controls the speed of the engine () to an idling speed serving as a speed lower than the normal work speed when an operating device has returned from an operating position to a neutral position. Configuration is made such that the main controller () performs a control process for bringing the speed of the engine () to a specific work speed serving as a speed higher than the idling speed but lower than the normal work speed, on detecting execution of the specific work which is performed with an operation amount of the operating device such as a boom operating device () being kept small in a state in which the speed of the engine () is kept at the idling speed. 11112117812451415127816171415201145111617. An engine speed controller of a working machine , the engine speed controller being provided in the working machine , the working machine having an engine () , a main pump () driven by the engine () , a hydraulic cylinder ( , ) operating due to pressure oil discharged from the main pump () to thereby drive a work implement ( , ) , a directional control valve ( , ) controlling the flow of the pressure oil supplied from the main pump () to the hydraulic cylinder ( , ) , and an operating device ( , ) performing switching operation on the directional control valve ( , ) , the engine speed controller comprising: a main controller () which is capable of controlling the speed of the engine () to a normal work speed at which the work implement ( , ) can perform normal work and ...

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05-06-2014 дата публикации

HYDRAULIC ACTUATOR DAMPING CONTROL SYSTEM FOR CONSTRUCTION MACHINERY

Номер: US20140150416A1
Автор: Lee Chun-Han
Принадлежит: VOLVO CONSTRUCTION EQUIPMENT AB

Disclosed is an actuator damping control system for reducing shocks imparted to a hydraulic actuator caused by a change in load resulting from an abrupt manipulation of a boom or other working device. The hydraulic actuator damping control system for construction machinery according to one embodiment of the present invention comprises: first and second supply passages both supplying a hydraulic flow from a hydraulic pump to an inlet of an actuator; first and second discharge passages, both of which return the hydraulic flow from the actuator to a hydraulic tank; a first meter “in” control valve and a first meter “out” control valve for controlling the hydraulic flow supplied from the hydraulic pump to the actuator inlet and the hydraulic flow returned from the actuator outlet to the hydraulic tank, respectively, in order to control the actuator in a direction; a second meter “in” control valve and a second meter “out” control valve for controlling the hydraulic flow supplied from the hydraulic pump to the actuator inlet and the hydraulic flow returned from the actuator outlet to the hydraulic tank, respectively, in order to control the actuator in another direction; and a controller for outputting control signals for opening either the first or second meter “in” control valve according to the degree to which a joystick is manipulated and the load on the actuator, and for opening either the first or second meter “out” control valve when the load on the actuator exceeds a reference value. 1. A hydraulic actuator damping control system for a construction machine , the system comprising:at least one hydraulic actuator connected to a variable displacement hydraulic pump;{'b': 1', '1, 'first and second supply paths connected in parallel to a discharge flow path of the hydraulic pump and configured to allow a hydraulic fluid from the hydraulic pump to be respectively supplied to an inlet and an outlet of the actuator;'}first and second discharge paths branch-connected to ...

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24-03-2022 дата публикации

HYDRAULIC SYSTEM FOR WORKING MACHINE

Номер: US20220090611A1
Автор: FUKUDA Yuji, HONDA Keigo
Принадлежит: KUBOTA CORPORATION

A hydraulic system includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, a second control valve to control the second hydraulic actuator, a pressure increasing portion to increasing a pressure of the operation fluid, a first discharge fluid tube connected to any one of the first control valve and the second control valve and connected to the pressure increasing portion, a second discharge fluid tube connected to the first discharge fluid tube and configured to discharge the operation fluid, a float switching valve having an allowance position, a prevention position, and a float position, the allowance position blocking the second discharge fluid tube and allowing the operation fluid to flow to the pressure increasing portion, the prevention position unblocking the second discharge fluid tube and preventing the operation fluid from flowing to the pressure increasing portion. 1. A hydraulic system for a working machine , comprising:a hydraulic pump to output an operation fluid;a first hydraulic actuator;a second hydraulic actuator;a first control valve to control the first hydraulic actuator;a second control valve to control the second hydraulic actuator, the second control valve being arranged on a downstream side of the first control valve;a pressure increasing portion to increasing a pressure of the operation fluid;a first discharge fluid tube connected to any one of the first control valve and the second control valve and connected to the pressure increasing portion;a second discharge fluid tube connected to the first discharge fluid tube and configured to discharge the operation fluid separately from the first discharge fluid tube;{'claim-text': ['the allowance position blocking the second discharge fluid tube and allowing the operation fluid to flow to the pressure increasing portion,', 'the prevention position unblocking the second discharge fluid tube and preventing ...

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05-03-2020 дата публикации

TRAVELING CONTROL MECHANISM AND TRAVELING CONTROL METHOD OF HYDRAULIC DRIVING TYPE CONSTRUCTION MACHINE

Номер: US20200071911A1
Автор: Sato Tomonori
Принадлежит: TAKEUCHI MFG. CO., LTD.

To provide a traveling control mechanism and a traveling control method capable of controlling a traveling mechanism taking into consideration operation contents of a remote control valve. The problem is solved by a traveling control mechanism comprising a remote control valve (), a pressure adjusting solenoid valve (), a setting mechanism (), and a controller (). The traveling mechanism () allows a traveling speed to be switched between a high speed and a low speed in accordance with an operation amount of the remote control valve (). An HST circuit () is provided with a pump () and a traveling motor (), the pump () connects to a pilot line () allowing a hydraulic oil supplied from the remote control valve () to flow therethrough, a pressure sensor () is attached to the pilot line (), and a rotation sensor () is attached to the traveling motor (). The controller () controls a pressure of the hydraulic oil supplied from the remote control valve () independently of a manual operation of the remote control valve (), on the basis of a setting signal, a pressure signal, and a rotation speed signal. The remote control valve () controls a flow rate of the hydraulic oil discharged from the pump () by changing or keeping constant the pressure inside the pilot line (). 1. A traveling control mechanism that controls a traveling mechanism configured by an HST circuit and provided to each of a left and a right of a construction machine , the traveling control mechanism comprising:a remote control valve that controls an operation of the construction machine;a pressure adjusting solenoid valve that adjusts a primary pressure of a hydraulic oil supplied to the remote control valve;a setting mechanism for executing a fixed setting to make the construction machine perform a desired operation; anda controller for controlling the traveling mechanism, wherein:the traveling mechanism is configured to be capable of switching a traveling speed of the construction machine between a high ...

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24-03-2016 дата публикации

SYSTEM TO PUMP FLUID AND CONTROL THEREOF

Номер: US20160084274A1
Автор: Afshari Thomas
Принадлежит:

A fluid system includes a variable-speed and/or a variable-torque pump to pump a fluid, at least one proportional control valve assembly, an actuator that is operated by the fluid to control a load, and a controller that establishes a speed and/or torque of the pump and a position of the at least one proportional control valve assembly. The pump includes at least one fluid driver that provides fluid to the actuator, which can be, e.g., a fluid-actuated cylinder, a fluid-driven motor or another type of fluid-driven actuator that controls a load. Each fluid driver includes a prime mover and a fluid displacement assembly. The fluid displacement assembly can be driven by the prime mover such that fluid is transferred from the inlet port to the outlet port of the pump. 1. A hydraulic system comprising: at least one motor, the at least one motor being at least one of a variable-speed and a variable-torque motor, and', 'a gear assembly to be driven by the at least one motor such that fluid is transferred from an inlet port of the hydraulic pump to an outlet port of the hydraulic pump;, 'a hydraulic pump to provide hydraulic fluid to a hydraulic actuator having first and second ports, the hydraulic pump including,'} a first control valve disposed on a side of the inlet port, the first valve in fluid communication with the first port and the inlet port, and', 'a first control valve actuator to operate the first control valve;, 'a first control valve assembly including,'} a second control valve disposed on a side of the outlet port, the second valve in fluid communication with the second port and the outlet port, and', 'a second control valve actuator to operate the second control valve; and, 'a second control valve assembly including,'}a controller that concurrently establishes at least one of a speed and a torque of the at least one motor and an opening of the first and second control valves so as to maintain at least one of a flow and a pressure in the hydraulic system at ...

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31-03-2022 дата публикации

Turn-driving apparatus for work machine

Номер: US20220098825A1
Принадлежит: Kobelco Construction Machinery Co Ltd

A turn-drive apparatus capable of securing high acceleration at the time of turning start with a reduced relief loss includes a hydraulic pump of a variable capacity type, a turning motor, a turning control device, a relief valve, and a flow rate control device that controls a pump flow rate. The flow rate control device calculates a relief-cut-control target pump flow rate on the basis of the sum of a minimum relief flow rate and a turning-speed flow rate, and inputs a pump capacity command to the variable capacity-type hydraulic pump based thereon. The flow rate control device makes the relief-cut-control target pump flow rate larger than the sum of the minimum relief flow rate and the turning-speed flow rate at the time of turning start.

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31-03-2016 дата публикации

Method for determining a control force of an actuator

Номер: US20160091001A1
Принадлежит: ZF FRIEDRICHSHAFEN AG

A method for determining an operating force (F p ) of a positioning actuator ( 3 ), whose adjustment movements are produced by virtue of an appropriate supply of a working medium via actuating at least one valve ( 4 to 7 ) associated with the positioning actuator ( 3 ). The operating force (F p ) is determined by computational determination. To be able to carry out the computational determination of the operating force (F p ) with little effort, by the at least one valve ( 4 to 7) in each case, a respective, essentially constant mass flow ({dot over (m)} iv , {dot over (m)} ov ) of working medium is maintained either into the positioning actuator ( 3 ) and/or out of the positioning actuator ( 3 ).

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30-03-2017 дата публикации

Actuator Limit Controller

Номер: US20170089365A1
Принадлежит:

In some applications, a piston of a hydraulic actuator may move at high speeds, and large undesired forces may be generated if the piston reaches an end-stop of the hydraulic actuator at a high speed. The undesired forces may, for example, cause mechanical damage in the hydraulic actuator. A controller may receive information indicative of the piston reaching a first position at a first threshold distance from the end-stop, and, in response, may modify a signal to a valve assembly controlling flow of hydraulic fluid to and from the hydraulic actuator. Further, the controller may receive information indicative of the piston reaching a second position at a second threshold distance closer to the end-stop of the hydraulic actuator, and, in response, the controller may further modify the signal to the valve assembly so as to apply a force on the piston in a away from the end-stop. 1. A method comprising:receiving a command for moving a piston of a hydraulic actuator at a given speed in a given direction, wherein a valve is fluidly coupled to the hydraulic actuator;based on the command, sending a signal to operate the valve to provide hydraulic fluid to the hydraulic actuator to cause motion of the piston at the given speed in the given direction;receiving position information indicative of the piston reaching a first position relative to an end-stop of the hydraulic actuator;in response, modifying the signal to the valve to reduce a speed of the piston;receiving position information indicative of the piston reaching a second position closer to the end-stop of the hydraulic actuator; andin response, further modifying the signal to the valve to cause the hydraulic fluid to apply a force on the piston in a direction away from the end-stop.2. The method of claim 1 , wherein modifying the signal to the valve to reduce the speed of the piston comprises sending the signal to cause a respective force to be applied to the piston in the direction away from the end-stop claim 1 , ...

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26-03-2020 дата публикации

METHOD FOR DETERMINING CLOSED-CONTROL PARAMETERS FOR A HYDRAULIC SYSTEM

Номер: US20200096013A1
Принадлежит: B&R INDUSTRIAL AUTOMATION GMBH

In order to carry out largely automated parameterisation of the closed-loop control parameters for closed-loop control of a hydraulic system comprising a servo drive, a method and a device for determining the closed-loop parameters of a closed-loop control unit of the hydraulic system are specified, wherein an actual system pressure of a hydraulic consumer of the hydraulic system is closed-loop controlled by means of a predefined set point rotational speed of a servo drive, wherein an actual rotational speed of the servo drive follows the predefined set point rotational speed, wherein an excitation signal is applied to the setpoint rotational speed, and the actual system pressure which is set here is measured, the dynamics of the hydraulic system are acquired from the actual rotational speed and/or the setpoint rotational speed and the actual system pressure, and the closed-loop control parameters are calculated from the acquired dynamics. 1618133132311. A method for determining control parameters (KP , Tt , TD , TF) of a control unit () of a hydraulic system () , characterized in that an actual system pressure (p_ist) of a hydraulic load () of the hydraulic system () being controlled by a predetermined target speed (n_soll) of a servo drive () comprising a motor () and a pump () , wherein an actual speed (n_ist) of the servo drive () follows the predetermined target speed (n_soll) , wherein an excitation signal (n) is applied to the target speed (n_soll) and the resulting actual system pressure (p_ist) is measured , in that the dynamics of the hydraulic system () is determined from the actual speed (n_ist) and/or the target speed (n_soll) and the actual system pressure (p_ist) , and in that the control parameters (KP , Tt , TD , TF) are calculated from the determined dynamics.20101. The method according to claim 1 , characterized in that a constant initial speed (n) is predetermined for the target speed (n_soll) before the application of the excitation signal (n) ...

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03-07-2014 дата публикации

DAMPING VALVE ARRANGEMENT FOR A SEMIACTIVE VIBRATION DAMPER

Номер: US20140182696A1
Автор: Wimmer Johannes
Принадлежит: WP Performance Systems GmbH

A damping valve arrangement is provided for controlling a pilot pressure that exerts influence on a control chamber of a damping device of a vibration damper through a control fluid, with an armature that is displaceable by the activity of an electrically energizable coil and provided in a housing, which armature includes a guide pin on which a first spring washer is provided and braces the guide pin. The first spring washer is designed for changing the area of a flow-through opening of the damping valve arrangement through which a control fluid is able to flow. 1125618811124142. A damping valve arrangement () for controlling a pilot pressure that exerts influence on a control chamber () of a damping device of a vibration damper () through a control fluid , with an armature () that is displaceable by means of an electrically energizable coil () and provided in a housing () , which armature comprises a guide pin () on which a first spring washer () is disposed and which braces the guide pin , the damping valve arrangement characterized in that the first spring washer is adapted for changing an area of a flow-through opening ( , ) of the arrangement through which a control fluid may flow.21116154142. The damping valve arrangement () according to claim 1 , characterized in that the guide pin () passes through the armature () and has a second spring washer () in an end area opposite the flow-through opening ( claim 1 , ) that provides outwardly radial bracing for the guide pin.311215687. The damping valve arrangement () according to claim 1 , characterized in that the spring washers ( claim 1 , ) guide the armature () radially and axially in the housing () and maintain the armature at a distance from an inner circumferential wall (′) of the housing.4168. The damping valve arrangement () according to claim 1 , characterized in that the armature () is arranged inside the housing () in a manner whereby it is surroundable by control fluid.511215243511233625372638. The ...

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04-04-2019 дата публикации

CONTROL METHOD AND SYSTEM FOR USING A PAIR OF INDEPENDENT HYDRAULIC METERING VALVES TO REDUCE BOOM OSCILLATIONS

Номер: US20190101137A1
Принадлежит:

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic cylinder (), first and second counter-balance valves (), and first and second control valves (). A net load () is supported by a first chamber () of the hydraulic cylinder, and a second chamber () of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response () that counters environmental vibrations () on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open. 1600. A hydraulic system comprising:{'b': 110', '116', '118', '118', '116, 'a hydraulic cylinder including a first chamber , and a second chamber , ;'}{'b': 300', '51, 'a first counter-balance valve fluidly connected to the first chamber at a first node ;'}{'b': 400', '52, 'a second counter-balance valve fluidly connected to the second chamber at a second node ;'}{'b': 700', '406', '53, 'a first control valve fluidly connected to the first counter-balance valve and to a pilot of the second counter-balance valve at a third node ; and'}{'b': 800', '306', '54, 'a second control valve fluidly connected to the second counter-balance valve and to a pilot of the first counter-balance valve at a fourth node );'}{'b': '90', 'claim-text': a holding pressure is transmitted from the first control valve to the third node to hold the first counter-balance valve at a closed position and to hold the second counter-balance valve at an open position, the holding pressure being less than a load pressure at the first node; and', {'b': '950', 'a fluctuating pressure is transmitted from the second control valve to the fourth node and through the open second counter-balance valve to the second node, the fluctuating pressure causing the hydraulic cylinder to produce a vibratory response .'}], 'wherein when a net load ...

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04-04-2019 дата публикации

Method and apparatus for controlling a double-acting pneumatic actuator

Номер: US20190101141A1
Принадлежит: FISHER CONTROLS INTERNATIONAL LLC

A control loop for a double-acting pneumatic actuator is configured to generate two control signals, one for each of the two pneumatic chambers for the purpose of controlling the actuator position in view of operating constraints on the chamber pressures or the stiffness of the actuator. A numerical indicator of the stiffness may be computed in a variety of ways, for example, as the average of the two chamber pressures. In one embodiment a numerical indicator of stiffness is treated as an output of the system along with the position of the actuator. A multi-input multi-output control loop with position and pressure feedback may be used to simultaneously control the position and the stiffness of the actuator.

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19-04-2018 дата публикации

CONSTRUCTION MACHINE

Номер: US20180106278A1
Принадлежит:

A hydraulic excavator is equipped with: an arm cylinder driven by a hydraulic working fluid from a hydraulic pump; a meter-out passage through which the hydraulic working fluid discharged from the arm cylinder flows; a control valve controlling the hydraulic fluid flow rate of the meter-out passage; a pressure sensor detecting a load acting on the arm cylinder; a pressure sensor detecting an operation amount of an operation device operating the arm cylinder; and a controller. The controller alternatively selects a normal operation mode in which the opening area of the control valve is controlled based on an actuator load and the operation amount, and a substitution operation mode in which the opening area of the control valve is controlled based on the operation amount. When the substitution operation mode is selected, a delivery flow rate of the hydraulic pump is further increased as compared with the normal operation mode. 1. A construction machine comprising:a hydraulic pump pumping up a hydraulic working fluid in a tank and delivering it;a hydraulic actuator driven by the hydraulic working fluid delivered from the hydraulic pump;a meter-out passage through which the hydraulic working fluid discharged from the hydraulic actuator flows;a meter-out control valve provided in the meter-out passage and controlling the hydraulic working fluid flow rate in the meter-out passage by varying an opening area;a load sensor detecting a load acting on the hydraulic actuator;an operation device operating the hydraulic actuator; andan operation amount sensor detecting an operation amount of the operation device, the construction machine further comprisinga control device configured to alternatively select a normal operation mode in which the opening area of the meter-out control valve is controlled based on the load and the operation amount and a substitution operation mode in which the opening area of the meter-out control valve is controlled based on the operation amount, ...

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10-07-2014 дата публикации

Slewing type construction machine

Номер: US20140190159A1
Автор: Kazuharu Tajima, Koji Ueda
Принадлежит: Kobelco Construction Machinery Co Ltd

Provided is a slewing type construction machine including an upper slewing body and a slewing speed sensor that detects a slewing speed of the upper slewing body, enabling accurate control to be achieved regardless of an error in output from the slewing speed sensor. The construction machine includes an upper slewing body, a slewing motor, a hydraulic pump, a control valve, a slewing operation device, a slewing brake, a slewing speed sensor, a slewing operation detector that detects an operation applied to the slewing operation device, and a controller. The controller stores, during a slewing operation, a slewing speed detected by the slewing speed sensor at set time intervals, actuates the slewing brake based on a neutral return operation of the slewing operation device, and resets a stored value of the slewing speed that is stored during actuation of the slewing brake, to zero.

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11-04-2019 дата публикации

Crane

Номер: US20190106301A1
Автор: Naotaka Masuda
Принадлежит: Tadano Ltd

The present invention is configured so that it is possible to select any one of a first mode in which a first adjustment valve 13 and a second adjustment valve 20 operate solely on the basis of manipulation of a main manipulation tool (turning lever 8 i ), a second mode in which the first adjustment valve 13 operates solely on the basis of manipulation of the main manipulation tool ( 8 i ) and the second adjustment valve 20 operates solely on the basis of manipulation of a secondary manipulation tool (brake pedal 8 j ), and a third mode in which the first adjustment valve 13 operates solely on the basis of manipulation of the main manipulation tool ( 8 i ) and the second adjustment valve 20 operates on the basis of manipulation of the secondary manipulation tool ( 8 j ) while operating on the basis of manipulation of the main manipulation tool ( 8 i ).

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11-04-2019 дата публикации

Working machine

Номер: US20190106306A1
Автор: Tadashi Miyazaki

A working machine includes a lower body, a turning body, a turning manipulating member which turns the turning body, a hydraulic motor which rotationally drives the turning body, a brake device which brakes the hydraulic motor, amain hydraulic source which supplies hydraulic oil to the hydraulic motor, and a direction control valve which controls a flow direction of the hydraulic oil according to the manipulated variable of the turning manipulating member, in which in a state where the hydraulic motor is braked by the brake device based on a manipulation of a brake manipulating member, when the turning manipulation is performed by the turning manipulating member, a brake applied to the hydraulic motor by the brake device is released with respect to turning in an indication direction indicated by the turning manipulation such that the turning body turns in the indication direction.

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18-04-2019 дата публикации

IMPROVED ARRANGEMENT AND METHOD FOR OPERATING A HYDRAULIC CYLINDER

Номер: US20190113057A1
Автор: Olsson Tommy
Принадлежит:

A carrier comprising a hydraulic cylinder having a piston, a controller and a piston position sensor, wherein the carrier is arranged to carry an accessory through the use of the hydraulic cylinder and wherein the controller is configured to: receive piston position information; determine a direction of movement of the piston; and if the piston position equals a stop distance from an end wall of the hydraulic cylinder in the direction of movement, abort the movement. 1. A carrier comprising a hydraulic cylinder having a piston , a controller and a piston position sensor , wherein the carrier is arranged to carry an accessory through the use of the hydraulic cylinder and wherein the controller is configured to:receive piston position information;determine a direction of movement of the piston; andif the piston position equals a stop distance from an end wall of the hydraulic cylinder in the direction of movement, abort the movement so as to stop the piston at the stop distance.2. The carrier according to claim 1 , wherein the controller is further configured to receive an indication of an accessory type and set the stop distance according to the accessory type.3. The carrier according to claim 1 , wherein the stop distance is a bottom stop distance associated with a bottom end of the hydraulic cylinder.4. The carrier according to claim 3 , wherein the stop distance is a head stop distance associated with a head end of the hydraulic cylinder.5. The carrier according to claim 4 , wherein the head stop distance is different from the end stop distance.6. The carrier according to claim 4 , wherein the head stop distance equals the end stop distance.7. The carrier according to claim 2 , further comprising a vibration or a shock sensor claim 2 , wherein the controller is further configured to receive vibration or shock information and based on the vibration or shock information adapt the stop distance.8. The carrier according to claim 7 , wherein the controller further ...

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05-05-2016 дата публикации

HYDRAULIC SYSTEM FOR AN AIR CART

Номер: US20160123353A1
Автор: Millie Stewart Joseph
Принадлежит:

A hydraulic system for an air cart includes a primary hydraulic assembly and a secondary hydraulic assembly. The hydraulic system also includes a first valve configured to block a flow of a hydraulic fluid flowing in a first direction from the primary hydraulic assembly and a second valve configured to block a flow of the hydraulic fluid flowing in a second direction from the secondary hydraulic assembly. 1. A hydraulic system for an air cart comprising:a primary hydraulic assembly;a secondary hydraulic assembly;a first valve configured to block a flow of a hydraulic fluid flowing in a first direction from the primary hydraulic assembly; anda second valve configured to block a flow of the hydraulic fluid flowing in a second direction from the secondary hydraulic assembly.2. The hydraulic system of claim 1 , wherein the primary hydraulic assembly comprises a hydraulic motor configured to power a fan of the air cart.3. The hydraulic system of claim 1 , wherein the primary hydraulic assembly comprises a hydraulic motor configured to power an alternator of the air cart.4. The hydraulic system of claim 3 , wherein the alternator is configured to power a metering system of the air cart.5. The hydraulic system of claim 1 , wherein the secondary hydraulic assembly comprises a hydraulic motor configured to power a conveyor of a conveyance system of the air cart.6. The hydraulic system of claim 1 , wherein the secondary hydraulic assembly comprises a hydraulic cylinder configured to control an arm of a conveyance system of the air cart.7. The hydraulic system of claim 1 , wherein the secondary hydraulic assembly comprises a hydraulic motor configured to power an auxiliary feed system.8. The hydraulic system of claim 1 , wherein the first valve and the second valve comprise a check valve.9. The hydraulic system of claim 1 , wherein the hydraulic system is configured to accommodate different flow rates of the hydraulic fluid.10. A hydraulic system for an air cart comprising:a ...

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31-07-2014 дата публикации

Method and Hydraulic Control System Having Swing Motor Energy Recovery

Номер: US20140208728A1
Принадлежит: CATERPILLAR INC.

A hydraulic control system includes a swing control valve between a pump and a swing motor to control flow to/from the swing motor, and a selector valve between an accumulator and the swing motor to regulate fluid flow. A controller is configured to receive inputs indicative of the pressure differential between the accumulator and conduit between the pump and swing motor, and a swing motor command, calculate a target swing motor flow based on the swing motor command input, and modulate operation of the swing control valve and the selector valve to regulate a swing speed. 1. A control circuit comprising:a swing motor, the swing motor having a first chamber and a second chamber, the swing motor moving in a first direction when fluid flows into the swing motor through the first chamber, the swing motor moving in a second direction when fluid flows into the swing motor through the second chamber;first and second conduits, the first conduit connected to the first chamber of the swing motor, the second conduit connected to the second chamber of the swing motor;a pump adapted to selectively provide fluid to the swing motor through the first and second conduits;an accumulator;at least one electrically-operated selector valve, the first selector valve being hydraulically connected to the first and second chambers and to the accumulator and being movable between a closed position wherein the accumulator is hydraulically blocked from the swing motor, a first open position wherein a flow path between the first chamber of the swing motor and the accumulator is defined, and a second open position wherein a flow path between the second chamber of the swing motor and the accumulator is defined;at least one pressure sensor disposed to detect a pressure differential between the accumulator and at least one of the first chamber and the second chamber;at least one swing control valve, the swing control valve hydraulically connected to the pump and to the first and second chamber ...

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21-05-2015 дата публикации

DRIVING DEVICE FOR WORK MACHINE AND WORK MACHINE EQUIPPED THEREWITH

Номер: US20150135697A1
Принадлежит:

There is provided a driving device for a work machine, having a closed hydraulic circuit system for driving cylinders with hydraulic pumps, the driving device making the speed of operation substantially the same in both directions of piston rod extension and contraction. The driving device includes: a first hydraulic pump that has flow rate control device for controlling the flow rate and direction of hydraulic fluid to be delivered; a single rod hydraulic cylinder that is driven with the hydraulic fluid to drive one of work members of a work device on the work machine; a closed hydraulic circuit that connects the first hydraulic pump with the single rod hydraulic cylinder to form a closed circuit using flow lines through which the hydraulic fluid flows; a branch line that branches from the flow line between the first hydraulic pump and the single rod hydraulic cylinder; a first flow line of which one end is connected to the branch line; a tank to which the other end of the first flow line is connected; and a hydraulic fluid flow rate control device attached to the first flow line to control the flow rate of the hydraulic fluid flowing from the branch line to the tank or from the tank to the branch line. 1. A driving device for a work machine , comprising:a first hydraulic pump that has flow rate control device for controlling the flow rate and direction of hydraulic fluid to be delivered;a single rod hydraulic cylinder that is driven with the hydraulic fluid to drive one of work members of a work device on the work machine;a closed hydraulic circuit that connects the first hydraulic pump with the single rod hydraulic cylinder to form a closed circuit using flow lines through which the hydraulic fluid flows;a branch line that branches from the flow line between the first hydraulic pump and the single rod hydraulic cylinder;a first flow line of which one end is connected to the branch line;a tank to which the other end of the first flow line is connected; anda ...

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17-05-2018 дата публикации

SYSTEM AND METHOD FOR OPERATING A BALLAST CAR HOPPER DOOR

Номер: US20180134201A1
Принадлежит: HERZOG RAILROAD SERVICES, INC.

A system and method for operating a ballast car hopper door includes logic and control circuitry, a hydraulic actuator, a door position sensor, and one or more sensors operable to measure system operational parameters. During normal operation of the hopper door the logic and control circuitry records the system operational parameters. In the event of failure, or absence, of the door position sensor the control circuitry compares real-time data to recorded data to maintain operation and correct positioning of the hopper door. 1. A system for operating a ballast car hopper door , comprising:an actuator mechanically coupled to a hopper door, the actuator operable to move the hopper door between open and closed positions;a position sensor coupled to the hopper door and operable to generate an electrical signal corresponding to a position of the hopper door;at least one system sensor operable to measure at least one system parameter corresponding to movement of the hopper door, wherein the system parameter is not a position of the hopper door; andlogic and control circuitry in communication with the position sensor and the system sensor, wherein the logic and control circuitry:determines whether the position sensor is functioning properly using data obtained from the position sensor;commands the actuator to move the hopper door to a desired position; andif the position sensor is not functioning properly, monitors real-time data from the at least one system sensor as the hopper door moves and compares the real-time data to corresponding stored data to determine that the hopper door moved as commanded.2. The system of claim 1 , wherein the at least one system sensor is selected from the group consisting of: pressure sensors claim 1 , flow sensors claim 1 , temperature sensors claim 1 , voltage sensors claim 1 , current sensors claim 1 , and combinations thereof.3. The system of claim 1 , wherein the logic and control circuitry further:records into memory real time data ...

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30-04-2020 дата публикации

Servohydraulic Drive

Номер: US20200132091A1
Принадлежит:

A servohydraulic drive includes a hydrostatic displacement machine, an electric machine that is mechanically speed-coupled with the displacement machine, a hydraulic cylinder that is fluidically connected to the displacement machine via first and second working lines, a hydraulic accumulator, and a supply unit. The displacement machine has a stroke that is adjustable via a hydraulic adjustment device. The cylinder is configured to be activated by reversal of the fluid flow through the displacement machine in opposite directions. The accumulator is preset to a low pressure and is fluidically connected via a valve assembly in each case to the lower pressure working line. The supply unit is configured to supply the adjustment device with pressurized fluid under the necessary pressure for the adjustment regardless of the present pressure in the working lines such that the displacement machine is configured for an active and load pressure-independent adjustment of its stroke volume. 1. A servohydraulic drive , comprising:a hydrostatic displacement machine having a stroke volume configured to be adjusted by a hydraulic adjustment device;an electric machine that is mechanically speed-coupled with the displacement machine;a hydraulic cylinder that is fluidically connected to the displacement machine via a first working line and a second working line, the hydraulic cylinder configured to be activated by reversal of the fluid flow through the displacement machine in opposite directions;a low-pressure hydraulic accumulator that is preset to a low pressure and fluidically connected via a valve assembly in each case to one of the first and second working lines in which the lower pressure prevails; anda supply unit configured to supply the adjustment device with pressurized fluid under the necessary actuating pressure for the adjustment regardless of the present pressure in the first and second working lines.2. The servohydraulic drive according to claim 1 , further comprising a ...

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30-04-2020 дата публикации

OVER-PRESSURE PROTECTION SYSTEM

Номер: US20200132093A1
Принадлежит:

Example aspects of an over-pressure protection system and a method for using an over-pressure protection system are disclosed. The over-pressure protection system can comprise a main body comprising a main body housing, the main body housing defining a main body chamber; an incompressible fluid received in the main body chamber, the fluid defining a fluid pressure; a pressure sensor for measuring the fluid pressure of the incompressible fluid, the pressure sensor configurable an activated mode and a deactivated mode; a first barrier movable between a first position and a second position; wherein the over-pressure protection system is configurable an under-pressure configuration, wherein the pressure of the incompressible fluid is below a threshold pressure, and an over-pressure configuration, wherein the pressure of the incompressible fluid is equal to or above the threshold pressure; and a control system configuring the pressure sensor in the deactivated mode in the over-pressure configuration 1. An over-pressure protection system comprising:a main body comprising a main body housing, the main body housing defining a main body chamber;an incompressible fluid received in the main body chamber, the fluid defining a fluid pressure;a pressure sensor configured to measure fluid pressure of the incompressible fluid, the pressure sensor configurable in an activated mode and a deactivated mode;a first barrier configured to move between a first position and a second position;wherein the over-pressure protection system is configurable in an under-pressure configuration, wherein the pressure of the incompressible fluid is below a threshold pressure, and an over-pressure configuration, wherein the pressure of the incompressible fluid is equal to or above the threshold pressure; anda control system configured to place the pressure sensor in the deactivated mode in the over-pressure configuration.2. The over-pressure protection system of claim 1 , wherein the control system is ...

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09-05-2019 дата публикации

ELECTRO-HYDRAULIC OR ELECTRO-PNEUMATIC SERVO-ACTUATOR USING KHAYYAM TRIANGLE

Номер: US20190136876A1
Автор: Fallahi Shahin
Принадлежит:

An actuator includes a cylinder, a first 2/2-way solenoid valve, a second 2/2-way solenoid valve, a fuzzy block, a controller, a source, a silencer, and a sensor. The cylinder is configured to receive a piston. The piston defines a first chamber and a second chamber inside the cylinder. The first 2/2-way solenoid valve includes an input terminal and a plurality of ports. The second solenoid valve includes an input terminal and a plurality of ports. The fuzzy block includes a plurality of phases each phase including a 2/2-way solenoid valve and a flow control valve for controlling the speed of movement of the piston within the cylinder. The controller is configured to issue a control signal for controlling the first and second 2/2-way solenoid valves and the 2/2-way solenoid valves included within the plurality of phases. 1. An actuator comprising:a cylinder configured to receive a piston, the piston defining a first chamber and a second chamber inside the cylinder;a first 2/2-way solenoid valve including an input terminal and a plurality of ports;a second 2/2-way solenoid valve including an input terminal and a plurality of ports;a fuzzy block including a plurality of phases each phase including a 2/2-way solenoid valve and two flow control valves for controlling the speed of movement of the piston within the cylinder;a controller configured to issue a control signal for controlling the first and second 2/2-way solenoid valves and the 2/2-way solenoid valves included within the plurality of phases;a source connected to fuzzy block through the first 2/2-way solenoid valve and configured to produce pressure output to the cylinder; anda silencer connected to the fuzzy block through the second 2/2-way solenoid valve and configured to reduce noise during exist of pressure from the cylinder;a sensor connected to the piston and configured to sense the position of the piston and send an electrical position signal to the controller, wherein the controller is configured to ...

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09-05-2019 дата публикации

Method for Operating a Valve Device, Valve Device and Data Storage Medium with a Computer Program

Номер: US20190136880A1
Принадлежит:

A method for operating a valve device for supplying compressed air to compressed air consumer includes the method comprising the steps of: determination of a first fluid pressure in a first section of a fluid passage of a valve assembly, which extends between an inlet port, and a valve element, determination of a second fluid pressure in a second section of the fluid passage of the valve assembly, which extends between the valve element and an outlet port, determination of a flow value for the valve element from the two fluid pressures and of a flow function, relating of the flow value with a presettable volumetric fluid flow rate or mass fluid flow rate for the pressurised fluid, which flow rate is provided for flow through the fluid passage, to a guide value and determination of a required actuating energy for an actuating device, and provision of the actuating energy to the actuating device. 1. A method for operating a valve device for supplying compressed air to compressed air consumer , the method comprising the steps of: determination of a first fluid pressure in a first section of a fluid passage of a valve assembly , which extends between an inlet port which is provided for a fluidically communicating connection to a fluid source or a fluid sink , and a valve element , determination of a second fluid pressure in a second section of the fluid passage of the valve assembly , which extends between the valve element and an outlet port which is provided for a fluidically communicating connection to a compressed air consumer , determination of a flow value for the valve element from the two fluid pressures and of a flow function , relating of the flow value with a presettable volumetric fluid flow rate or mass fluid flow rate for the pressurised fluid , which flow rate is provided for flow through the fluid passage , to a guide value and determination of a required actuating energy for an actuating device which is designed for an actuation of the valve element , ...

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04-06-2015 дата публикации

CONSTRUCTION MACHINE AND CONTROLLER

Номер: US20150152890A1
Автор: KOBAYASHI Masayuki
Принадлежит: KAYABA INDUSTRY CO., LTD.

A construction machine having an actuator that is driven by a working fluid includes a state value detection unit that detects a state value indicating an operating condition of the actuator, a mode determination unit that determines an operating mode by comparing the state value with a determination condition value, and a condition value setting unit that modifies the determination condition value on the basis of a comparison result of the mode determination unit. The condition value setting unit sets the determination condition value such that the determination condition value is increased when the state value falls below the determination condition value and decreased when the state value rises above the determination condition value. 1. A construction machine having an actuator that is driven by a working fluid , comprising:a state value detection unit that detects a state value indicating an operating condition of the actuator;a mode determination unit that determines an operating mode by comparing the state value with a determination condition value; anda condition value setting unit that modifies the determination condition value on the basis of a comparison result of the mode determination unit,wherein the condition value setting unit sets the determination condition value such that the determination condition value is increased when the state value falls below the determination condition value and decreased when the state value rises above the determination condition value.2. The construction machine as defined in claim 1 , wherein the condition value setting unit is configured to set a first threshold or a second threshold that is higher than the first threshold as the determination condition value on the basis of the comparison result of the mode determination unit claim 1 ,whereby, in a case where the first threshold is set as the determination condition value, the condition value setting unit modifies the determination condition value to the second ...

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15-09-2022 дата публикации

Hydraulic system, mining machine and method of controlling hydraulic actuator

Номер: US20220290407A1
Принадлежит: Sandvik Mining and Construction GmbH

A hydraulic system, mining machine and method of controlling a hydraulic actuator. The hydraulic system (HS) is provided with a control valve (23) for controlling movement direction and speed of a hydraulic actuator (HA) connected to the system. Generated force of the hydraulic actuator is controlled independently relative to the control valve by means of counterbalance valves (Cb1, Cb2) and servo valves (Sv1, Sv2) controlling their opening pressure. The counterbalance valves and the servo valves operate as a meter-out control assembly which controls flow of hydraulic fluid discharged from working pressure spaces (16a, 16b) of the hydraulic actuator. The disclosed system may be implemented to control a mining boom (3) of a mining machine (1).

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16-05-2019 дата публикации

CONTROL OF VARIABLE GRAVITY DRIVEN HYDRAULIC LOADS

Номер: US20190145083A1
Принадлежит:

A system for controllably moving a work implement of a work vehicle having a hydraulic fluid pump for providing fluid to the work implement, the system comprising: at least one operator command tool to produce an operator command signal to move the implement of the work vehicle; at least one sensor to sense a cylinder speed signal indicative of a speed of a hydraulic cylinder coupled to the implement; at least one valve to modulate the fluid flow of the hydraulic cylinder; and a controller. 1. A method for controllably moving a work implement of a work vehicle having a hydraulic fluid pump for providing fluid flow to the work implement , the work implement including a plurality of work functions that includes a lifting and a lowering function through modulating fluid flow to a hydraulic cylinder through at least one valve , the method comprising:generating an operator command signal to move the implement on the work vehicle and converting the operator command signal into a speed command signal;sensing a cylinder speed signal indicative of a speed of a hydraulic cylinder, and generating a corresponding output cylinder velocity signal in response to the speed command signal and the cylinder speed signal;receiving the output cylinder velocity signal, and generating a corresponding electrical valve signal; andreceiving the electrical valve signal and controllably modifying a cross-section of the at least one valve to modulate the fluid flow of the hydraulic cylinder to move the hydraulic cylinder in accordance with the speed command signal.2. The method of claim 1 , wherein the cylinder speed signal is derived from a cylinder position sensor.3. The method of claim 1 , wherein the cylinder speed signal is derived from a state observer.4. The method of claim 3 , wherein the state observer includes an algorithm adapted to run on a controller.5. The method as set forth in claim 1 , further comprises:sensing a load signal indicative of a load on the hydraulic cylinder, ...

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17-06-2021 дата публикации

FLUID EXCHANGE DEVICES AND RELATED CONTROLS, SYSTEMS, AND METHODS

Номер: US20210180617A1
Принадлежит:

Devices, systems, and methods for detecting properties of motion of at least one component of fluid exchange devices, such as, for example, a pressure exchange device or system. 1. A device for detecting properties of a piston , the device comprising:at least one sensor positioned proximate a chamber; anda piston comprising one or more detection features arranged about a surface of the piston, wherein the piston is configured to travel within the chamber;wherein the at least one sensor is configured to produce a signal based on a proximity of the one or more detection features.2. The device of claim 1 , wherein the at least one sensor comprises at least two coils spaced a first distance apart along an axis of the chamber.3. The device of claim 2 , further comprising a third coil arranged around the chamber a second distance from one of the at least two coils.4. The device of claim 1 , wherein the one or more detection features comprise one or more magnets configured to induce a current in the at least one sensor.5. The device of claim 4 , wherein the one or more magnets are arranged such that a same pole of each of the one or more magnets faces radially outward.6. The device of claim 5 , wherein the one or more magnets are imbedded into the surface of the piston.7. A system for exchanging pressure between at least two fluid streams claim 5 , the system comprising: [ a first end for receiving a clean fluid with a first property; and', 'a second end for receiving a dirty fluid with a second property; and, 'at least one chamber comprising, 'at least one piston in the at least one chamber, the at least one piston configured to separate the clean fluid from the dirty fluid;, 'a pressure exchange device for exchanging at least one property between fluids, the pressure exchange device comprisinga valve device configured to selectively place the clean fluid in communication with the dirty fluid through the at least one piston in order to at least partially transfer the ...

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11-06-2015 дата публикации

Flow control valve for construction machinery

Номер: US20150159678A1
Автор: Jin-Wook Kim
Принадлежит: VOLVO CONSTRUCTION EQUIPMENT AB

Disclosed is a flow control valve for construction machinery, the flow control valve being adapted to reduce pressure loss due to flow on return to a hydraulic tank during the boom-down operation of a large-scale excavator. The flow control valve for construction machinery according to the present invention comprises: first and second boom spools which are respectively coupled to first and second boom valve blocks, and which regulate working fluid that is respectively supplied from first and second hydraulic pumps to a boom cylinder during direction reversal; a boom-up flow-adjusting means which, in direction reversal of the first and second boom spools for boom-up drive, supplies working fluid from the first and second hydraulic pumps into a large chamber of the boom cylinder via the first and second boom spools respectively, and causes part of the flow of working fluid from the second hydraulic pump to pass via the second boom spool so as to be combined with working fluid being supplied from the first hydraulic pump to the large chamber of the boom cylinder due to direction reversal of the first boom spool; and a boom-down flow-adjusting means which, in direction reversal of the first and second boom spools for boom-down drive, causes part of the flow of working fluid coming back from the large chamber of the boom cylinder to return to the hydraulic tank via the first and second boom spools respectively, and causes part of the flow of working fluid coming back from the large chamber of the boom cylinder to combine as respective regenerative flows for working fluid on the small chamber side of the boom cylinder.

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11-06-2015 дата публикации

PULSE CONTROLLED LINEAR ACTUATOR

Номер: US20150159679A1
Принадлежит:

Pulse controlled linear actuator comprising a working cylinder () for receiving a medium introduced through a valve system by a compressor/pump, a piston, the shank () of which represents the output of the actuator. It also comprises a central solenoid () and alternately moved iron cores (). The central solenoid () and the iron cores () are arranged between upper and lower solenoids (). The iron cores () have two separate medium spaces (). The first medium space () leads into the portion of the working cylinder () above the piston () and under the piston (). The second medium space () is separated from the space between the iron cores () by the iron cores () and leads into the portion of the working cylinder () above the piston () and under the piston (). The valves () are counter-phase or phase pulse controlled. 1113121323141531444910889101533449108891048aabb. Pulse controlled linear actuator comprising a working cylinder for receiving a medium introduced through a valve system by a compressor/pump , a piston moving freely in the working cylinder , the piston shank of the piston represents the output of the actuator characterized in that said actuator further comprises a central solenoid () and positioned at least above and under said central solenoid () upper and lower iron cores () are arranged in pairs which are moved alternately by means of said central solenoid () and by means of upper and lower solenoids () which are arranged in pairs , said central solenoid () and said iron cores () are arranged between said upper and lower solenoids () , said iron cores () form a compressor/pump having two separate medium spaces ( , ) , from the space being between said upper and lower iron cores () said first medium space () is led through a first inlet () of an upper controlled dual inlet valve () into the portion of said working cylinder () which is above said piston () , and in addition it is led through a first inlet () of a lower controlled dual inlet valve () into ...

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07-06-2018 дата публикации

HYDRAULIC SYSTEM AND METHOD FOR REDUCING BOOM BOUNCE WITH COUNTER-BALANCE PROTECTION

Номер: US20180156243A1
Автор: WANG Meng (Rachel)
Принадлежит: EATON CORPORATION

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic cylinder (), first and second counter-balance valves (), first and second control valves (), and a selection valve set (). The selection valve set is adapted to self-configure to a first configuration and to a second configuration when a net load () is supported by a first chamber () and a second chamber () of the hydraulic cylinder, respectively. When the selection valve set is enabled in the first and second configurations, the second and first control valve may fluctuate hydraulic fluid flow to the second and first chamber, respectively, to produce a vibratory response () that counters environmental vibrations () of the boom. When the selection valve set is not enabled, the first and second counter-balance valves are adapted to provide the hydraulic cylinder with conventional counter-balance valve protection. 1. (canceled)2. A hydraulic system for actuating a boom , the hydraulic system comprising:a hydraulic actuator including a first chamber and a second chamber;a first control valve fluidly connected to the first chamber via a first counter-balance valve;a second control valve fluidly connected to the second chamber via a second counter-balance valve, the first and second control valves being independently operable with respect to each other; anda controller that interfaces with the first and second control valves, wherein the controller is configured to generate a vibration control signal that is transmitted to at least one of the first and second control valves to produce a vibratory control response applied to at least one of the first and second chambers.3. The hydraulic system of claim 2 , wherein the boom includes at least three arms that are pivotally connected to one another.4. The hydraulic system of claim 2 , wherein the boom is a concrete placement boom.5. The hydraulic system of claim 2 , wherein the ...

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14-05-2020 дата публикации

Energy regeneration device and work machine provided with energy regeneration device

Номер: US20200149250A1
Принадлежит: Kobe Steel Ltd

Provided are an energy regeneration device which can regenerate energy of a working fluid discharged from an actuator while controlling a flow rate of the working fluid, and a work machine including the foregoing device. The regeneration device (100) includes a boom cylinder (20), an inertial fluid container (102), an oil tank (110), an accumulator (105), a low-pressure-side opening/closing device (103), and a high-pressure-side opening/closing device (104). A calculation unit (151) calculates a duty ratio for opening/closing the low-pressure-side opening/closing device (103) and the high-pressure-side opening/closing device (104) in accordance with a desired flow rate of a working fluid discharged from the boom cylinder (20). A regeneration control unit (153) selects alternately the low-pressure-side opening/closing device (103) and the high-pressure-side opening/closing device (104) as a destination with which the inertial fluid container (102) communicates in accordance with the calculated duty ratio, and supplies a discharged working fluid to an accumulator (105).

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24-06-2021 дата публикации

HYDRAULIC EXCAVATOR DRIVE SYSTEM

Номер: US20210189691A1
Принадлежит: KAWASAKI JUKOGYO KABUSHIKI KAISHA

A hydraulic excavator drive system includes: a first pump connected to a boom main control valve and an arm auxiliary control valve by a first pump line; a second pump connected to a boom auxiliary control valve and an arm main control valve by a second pump line; and a controller that does not move the arm auxiliary control valve when arm crowding operation boom raising operations are performed concurrently. The boom auxiliary control valve moves together with the boom main control valve when the boom raising operation is performed. A boom raising second supply line, which connects the boom auxiliary control valve to a boom raising first supply line between the boom main control valve and a boom cylinder, is provided with a check valve that allows a flow from the boom auxiliary control valve toward a head side of the boom cylinder, but prevents a reverse flow. 1a boom main control valve connected to a boom cylinder by a boom raising first supply line and a boom lowering supply line;a boom auxiliary control valve connected to the boom raising first supply line by a boom raising second supply line, the boom auxiliary control valve moving together with the boom main control valve when a boom raising operation is performed;an arm main control valve connected to an arm cylinder by an arm crowding first supply line and an arm pushing first supply line;an arm auxiliary control valve connected to the arm crowding first supply line by an arm crowding second supply line and connected to the arm pushing first supply line by an arm pushing second supply line;a first pump connected to the boom main control valve and the arm auxiliary control valve by a first pump line;a second pump connected to the boom auxiliary control valve and the arm main control valve by a second pump line; anda controller that controls the arm auxiliary control valve via a solenoid proportional valve at least when an arm crowding operation is performed, the controller moving the arm auxiliary control ...

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24-06-2021 дата публикации

Hydraulic system

Номер: US20210189693A1
Принадлежит: Kawasaki Jukogyo KK

A hydraulic system includes: a regulator that adjusts a tilting angle of a pump; and a controller that controls the regulator such that a discharge flow rate of the pump is a lower one of an operation-requiring flow rate and a horsepower control flow rate. The controller stores a first horsepower control line and a second horsepower control line lower than the first control line. When an operating point exceeds the first horsepower control line, the controller decreases the tilting angle of the pump; when the operating point falls below the second horsepower control line, the controller increases the tilting angle of the pump. When the operating point exceeds the first control line or falls below the second control line, it is shifted and positioned between the first control line and the second horsepower control line, keeping the tilting angle of the pump as it is.

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04-09-2014 дата публикации

HYBRID EXCAVATOR HAVING A SYSTEM FOR REDUCING ACTUATOR SHOCK

Номер: US20140245734A1
Автор: Kim Jae-Hong
Принадлежит: VOLVO CONSTRUCTION EQUIPMENT AB

Disclosed is a hybrid excavator which reduces the impact generated at the start of the operation of the boom cylinder, or the like, of a hybrid excavator. The hybrid excavator according to the present invention comprises: a hydraulic pump motor connected to an electric motor and operated in the forward or reverse direction; a hydraulic cylinder connected to the hydraulic pump motor and operated in an expanding manner; a first and second hydraulic valve installed in a first and second passage, respectively, between the hydraulic pump motor and the hydraulic cylinder, for blocking the first and second passages when switched by an external control signal; a third hydraulic valve installed in the connecting path connected to first and second dividing passages. 1. A hybrid excavator provided with an actuator impact reduction system , wherein the actuator impact reduction system comprises:an electric motor;a hydraulic pump-motor connected to the electric motor and configured to be driven in a forward or reverse direction;a hydraulic cylinder configured to be expanded and contracted by a hydraulic fluid that is supplied along first and second flow paths connected to the hydraulic pump-motor;first and second hydraulic valves installed in the first and second flow paths between the hydraulic pump-motor and the hydraulic cylinder, respectively, and configured to be shifted to control the first and second flow paths in response to a control signal applied thereto from the outside;a third hydraulic valve installed in a connection path connected to first and second branch flow paths that are branch-connected to the first and second flow paths on an upstream side of the first and second hydraulic valves and the first and second flow paths on a downstream side of the first and second hydraulic valves, respectively, and configured to be shifted to compensate for or bypass a flow rate of the hydraulic fluid in order to overcome a difference in flow rate of the hydraulic fluid, which ...

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16-06-2016 дата публикации

VARIABLE PRESSURE CONTROL SYSTEM FOR DUAL ACTING ACTUATORS

Номер: US20160169253A1
Принадлежит:

A variable pressure control system for varying pressures in the fluid circuits of a dual acting actuator over a range of pressures. The variable pressure control system includes a controller that cooperates with pressure regulators for regulating the desired pressure in the fluid circuits. 1. A pressure control system , comprising:a first element imposing a force on a second element;a dual acting actuator operably coupled to said first element, said dual acting actuator having a down chamber whereby increased pressure in said down chamber increases said force, said dual acting actuator having a lift chamber whereby increased pressure in said lift chamber decreases said force;a pressure source; anda controller in fluid communication with said pressure source, with said lift chamber and said down chamber, said controller configured to selectively maintain a lift pressure in said lift chamber, wherein said controller comprises a pressure regulating valve that selectively maintains a down pressure in said down chamber at any of a continuous range of pressures.2. The pressure control system of claim 1 , further comprising:a user interface configured to modify an operating state of said controller, whereby when a user modifies a position of said user interface, one of said down pressure and said lift pressure is modified, whereby when said user modifies said position of said user interface, said force is modified.3. The pressure control system of claim 2 , wherein said user interface is configured to move through a continuous range of motion.4. The pressure control system of claim 3 , wherein said range of motion includes a lift range and a down range claim 3 , wherein said lift pressure varies according to said position of said user interface within said lift range claim 3 , wherein said down pressure varies proportionally with said position of said user interface within said down range.5. The pressure control system of claim 4 , wherein said range of motion includes a ...

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21-05-2020 дата публикации

HYDRAULIC SYSTEM

Номер: US20200158143A1
Принадлежит: KAWASAKI JUKOGYO KABUSHIKI KAISHA

A hydraulic system includes: an operation device that outputs an operation signal corresponding to an operating amount of an operating unit; a variable displacement pump that supplies hydraulic oil to a hydraulic actuator; a control valve interposed between the actuator and pump, the control valve changing a meter-in opening area thereof, so an increase rate of the opening area increases in accordance with increase in the operation signal; a regulator that adjusts a tilting angle of the pump; an unloading valve that defines an unloading flow rate, at which the hydraulic oil is released to a tank; and a controller that, when the operation device is operated, determines a control valve required flow rate so rate is proportional to the meter-in opening area of the control valve, and controls the regulator so a discharge flow rate of the pump is a sum of the control valve and unloading flow rates. 1. A hydraulic system comprising:at least one operation device that outputs an operation signal corresponding to an operating amount of an operating unit;a variable displacement pump that supplies hydraulic oil to at least one hydraulic actuator;at least one control valve interposed between the hydraulic actuator and the pump, the control valve changing a meter-in opening area thereof, such that an increase rate of the meter-in opening area increases in accordance with increase in the operation signal outputted from the operation device;a regulator that adjusts a tilting angle of the pump;an unloading valve that defines an unloading flow rate, at which the hydraulic oil discharged from the pump is released to a tank; anda controller that, when the operation device is operated, determines a control valve required flow rate such that the control valve required flow rate changes at a same change rate as that of the meter-in opening area of the control valve, and controls the regulator such that a discharge flow rate of the pump is a sum of the control valve required flow rate and ...

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25-06-2015 дата публикации

Hydraulic drive system

Номер: US20150176610A1
Принадлежит: KOMATSU LTD

A hydraulic fluid flowpath includes a first flowpath and a second flowpath. The first flowpath connects a first pump port and a first chamber in a hydraulic cylinder. The second flowpath connects a second pump port and a second chamber in the hydraulic cylinder. The hydraulic fluid flowpath forms a closed circuit between a hydraulic pump and the hydraulic cylinder. A bleed-off flowpath bleeds off a portion of the hydraulic fluid from the second flowpath. A control valve connects the second flowpath to the bleed-off flowpath via a throttle when an operation amount of an operating member for lowering a work implement is less than a predetermined operation amount so that a hydraulic pressure in second flowpath is maintained at less than a relief pressure. The predetermined operation amount is less than or equal to the maximum operation amount for lowering the work implement.

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21-06-2018 дата публикации

Fan Control System with Electro-Hydraulic Valve Providing Three Fan Motor Operational Positions

Номер: US20180172030A1
Принадлежит: CATERPILLAR INC.

A fan control system includes a tank, a pump, a hydraulic motor, a fan, and a control valve. The control valve is adapted to selectively direct a flow of hydraulic fluid from the pump through the control valve into a pressure control chamber of the hydraulic motor or from the pressure control chamber to the tank to vary the control pressure therein to move the hydraulic motor's swashplate between forward and reverse positions. The control valve is adapted to selectively direct hydraulic fluid from the pump into the pressure control chamber such that the control pressure therein is pressurized to an idle pressure to move the swashplate to an intermediate position between the forward and reverse positions such that the output shaft rotates at an idle rate which is less than the rotational speed of the output shaft when in the forward mode. 1. A fan control system comprising:a tank, the tank adapted to hold a reservoir of hydraulic fluid; 'the pump in fluid communication with the tank, the pump adapted to receive a supply of hydraulic fluid from the tank and to discharge a flow of hydraulic fluid;', 'a pump,'} the hydraulic motor including a first motor port, a second motor port, a pressure control chamber, a swashplate, and an output shaft,', 'the first motor port being in fluid communication with the pump to receive the flow of hydraulic fluid from the pump, and the second motor port being in fluid communication with the tank to return the flow of hydraulic fluid to the tank,', 'the swashplate being movable over a range of travel between a forward position and a reverse position in response to a control pressure within the pressure control chamber, a zero position being disposed between the forward position and the reverse position,', 'the output shaft, in response to the flow of hydraulic fluid moving into the first motor port, through the hydraulic motor, and out the second motor port, rotating in a first direction at a first rate when the swashplate is in the ...

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25-09-2014 дата публикации

Power regeneration device for working machine and working machine

Номер: US20140283509A1
Автор: Seiji Hijikata
Принадлежит: HITACHI CONSTRUCTION MACHINERY CO LTD

In a lowering operation of a boom, the amount of operation of a control lever is detected by a pressure sensor and input to a controller. Based on the input operation amount, the controller obtains a target flow rate Q 0 of return oil discharged from a boom cylinder, calculates a deviation ΔQ between the target flow rate Q 0 and an actual flow rate Q obtained from an actual rotation speed N of an electric motor acquired by a rotation speed sensor, calculates a signal Sm for controlling the opening area of a proportional solenoid valve in a manner allowing hydraulic fluid to flow to a control valve in just as much as ΔQ, and controls an operation pilot pressure of the control valve supplied from a sub-pump in accordance with the signal Sm so that the hydraulic fluid will flow to the control valve exactly in the amount of ΔQ.

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11-06-2020 дата публикации

SPEED CONTROLLER

Номер: US20200182264A1
Принадлежит: SMC Corporation

A valve body of a speed controller includes a main body that extends along a first axis and a mounting portion that projects from a side of the main body along a second axis that intersects the first axis orthogonally. A first port, a needle valve, and a check valve are disposed in the main body. The mounting portion, which is a portion to be mounted on a cylinder portion, includes a second port formed therein. A position at which the mounting portion is disposed on the side of the main body is away from the first axis in a direction of a third axis that orthogonally intersects the first axis and the second axis. 1. A speed controller , comprising:a check valve that controls a flow direction of pressurized fluid in a fluid channel that connects a first port and a second port to each other; anda needle valve that controls flow rate of the pressurized fluid supplied to a fluid-pressure cylinder or discharged from the fluid-pressure cylinder, whereina valve body of the speed controller includes a main body that extends along a first axis and a mounting portion to be mounted on a cylinder port of the fluid-pressure cylinder,the mounting portion projects from a side of the main body along a second axis that intersects the first axis orthogonally,the first port is formed in the main body and the needle valve and the check valve are disposed coaxially along the first axis,the second port is formed in the mounting portion, anda position at which the mounting body is connected to the side of the main body is away from the first axis in a direction of a third axis that orthogonally intersects the first axis and the second axis.2. The speed controller according to claim 1 , whereina bulging portion that projects in a direction of the third axis is formed on the side of the main body, andthe mounting portion is disposed in the bulging portion so as to protrude out of the bulging portion along the second axis.3. The speed controller according to claim 2 , whereina height of the ...

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11-06-2020 дата публикации

HYDRAULIC SYSTEM

Номер: US20200182265A1
Принадлежит: KAWASAKI JUKOGYO KABUSHIKI KAISHA

A hydraulic system includes: an operation device that outputs an operation signal corresponding to an operating amount of an operating unit; a pump that supplies hydraulic oil to a hydraulic actuator via a control valve; a bleed valve that defines a bleed flow rate, at which the hydraulic oil is released to a tank; and a controller that controls the bleed valve, so an opening area of the valve decreases in accordance with increase in the operation signal. The controller: when a rapid acceleration operation is not performed on the device, changes the opening area of the valve between a maximum value and zero along a normal opening line; and when the rapid acceleration operation is performed, changes the opening area of the valve between the maximum value and minimum value greater than zero along a special opening line from when the operation is started until a predetermined time elapses. 1. A hydraulic system comprising:an operation device that outputs an operation signal corresponding to an operating amount of an operating unit;a pump that supplies hydraulic oil to a hydraulic actuator via a control valve;a bleed valve that defines a bleed flow rate, at which the hydraulic oil discharged from the pump is released to a tank; anda controller that controls the bleed valve, such that an opening area of the bleed valve decreases in accordance with increase in the operation signal outputted from the operation device, whereinthe controller determines whether or not a rapid acceleration operation is performed on the operation device, and in a case where the rapid acceleration operation is not performed, changes the opening area of the bleed valve between a maximum value and zero along a normal opening line; and', 'in a case where the rapid acceleration operation is performed, changes the opening area of the bleed valve between the maximum value and a minimum value greater than zero along a special opening line from when the rapid acceleration operation is started until when ...

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20-07-2017 дата публикации

METHODS AND APPARATUS TO ENABLE BOOM BOUNCE REDUCTION AND PREVENT UN-COMMANDED MOTION IN HYDRAULIC SYSTEMS

Номер: US20170204886A1
Принадлежит:

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic actuator (), first and second counter-balance valves (), first and second independent control valves (), and first and second blocking valves (). The actuator includes first and second corresponding chambers. In a first mode, the second counter-balance valve is opened by the first control valve, and the first counter-balance valve is opened by the second control valve. In a second mode, at least one of the counter-balance valves is closed. A meter-out control valve () may be operated in a flow control mode, and/or a meter-in control valve () may be operated in a pressure control mode. Boom dynamics reduction may occur while the boom is in motion (e.g., about a worksite). By opening the counter-balance valves, sensors at the control valves may be used to characterize external loads. The control valves may respond to the external loads and at least partially cancel unwanted boom dynamics. The system may further detecting faults in actuators with counter-balance valves and prevent any single point fault from causing a boom falling event and/or mitigate such faults. 1110300400. A method of controlling a hydraulic actuator () hydraulically coupled to a pair of counter-balance valves ( , ) , the method comprising:{'b': 116', '118, 'providing the hydraulic actuator, the hydraulic actuator including a pair of chambers (, ) hydraulically coupled to the pair of counter-balance valves, respectively;'}{'b': 700', '800, 'providing a pair of control valves (, ) hydraulically coupled to the pair of counter-balance valves;'}{'b': 700', '800, 'operating a first control valve (, ) of the pair of control valves in a pressure control mode;'}{'b': 800', '700, 'operating a second control (, ) of the pair of control valves in a flow control mode; and'}transferring hydraulic fluid flow with the pair of control valves to/from the hydraulic actuator ...

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04-07-2019 дата публикации

ELECTRO HYDRAULIC DRIVE AND CONTROL SYSTEM

Номер: US20190203444A1
Автор: Stenlund Stig
Принадлежит:

A operator supporting electrohydraulic drive and control system based on, position sensors () (), a electronic control unite ECU (), a recovery, storing and re-use system for energy, and with actuator () () and the drive control valve () () bolted together in one () () unite and with the valve () () independently of the ECU () is controlling effective use of pump capacity and recovery of energy and with control of speed for low speeds, or prevented speed by valves () () or pump () () () () displacement and for higher speed with control of deplacement of pumps and motors and with valves () () at the same time controlled to be fully open. 1. A method for electrohydraulic drive and control of one actuator , or more than one actuator simultaneously controlled actuators , working on a machine , which are supplied with flow of fluids under pressure from a common high pressure pump system , each with flow of fluid through its drive control valve , said valves being connected in parallel to a common high pressure pump conduit from said pump system and to a common low pressure return conduit to tank and also to a individual high pressure energy recovery conduit going from said drive control valve and to every drive control valves own individual hydraulic rotating energy recovering motor , said method comprising the steps of:{'b': 1', '2, '1. Feeding outer input control signals from an outer operator control unit (.) to an electronic control unite (ECU) (.) for desired position, speed and acceleration value for said actuators.'}{'b': '2', '2. Supplying said ECU (.) with information about the instantaneous position of each of said actuators from position sensors that direct or after computing can give said information of each actuators position.'}3. Computing in ECU instantaneous speed, and acceleration of said actuator based on said information about instantaneous position and of time{'b': '2', '4. Computing in ECU (.) an allowed desired value for both direction for position, ...

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02-08-2018 дата публикации

HYDRAULIC DRIVING DEVICE FOR STEAM VALVE, COMBINED STEAM VALVE, AND STEAM TURBINE

Номер: US20180216486A1
Принадлежит: Mitsubishi Hitachi Power Systems, Ltd.

A hydraulic driving device for a steam valve includes a plurality of hydraulic actuators to generate driving force to be transmitted to the valve body through a valve shaft of the steam valve. The hydraulic actuators each include a cylinder, a piston that is capable of reciprocating in the cylinder, and a rod having respective ends connected to the piston and valve shaft. The hydraulic actuators include a main actuator including a throttle portion for regulating a flow of pressure oil in a hydraulic chamber defined by the cylinder and piston so that a damping force is applied to the valve body during its closing operation. The one or more hydraulic actuators other than the main actuator include at least one sub actuator not having the throttle portion. The hydraulic chamber of the sub actuator communicates with the hydraulic chamber of the main actuator. 1. A hydraulic driving device for a steam valve for driving a valve body of the steam valve , the hydraulic driving device comprising:a plurality of hydraulic actuators to generate driving force to be transmitted to the valve body through a valve shaft of the steam valve, wherein a cylinder;', 'a piston which is configured to be capable of reciprocating in the cylinder; and', 'a rod having one end connected to the piston and another end connected to the valve shaft,, 'the plurality of hydraulic actuators each includethe plurality of hydraulic actuators include a main actuator including a throttle portion for regulating a flow of pressure oil in a hydraulic chamber defined by the cylinder and the piston so that a damping force is applied to the valve body during a closing operation of the valve body,the one or more hydraulic actuators other than the main actuator include at least one sub actuator not having the throttle portion provided, andthe hydraulic chamber of the sub actuator is in communication with the hydraulic chamber of the main actuator.2. The hydraulic driving device for a steam valve according to claim ...

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11-07-2019 дата публикации

FLUID POWER DISTRIBUTION AND CONTROL SYSTEM

Номер: US20190211849A1
Принадлежит:

A fluid power system comprises a pump with multiple independently variable outlets, each of which is capable of delivering fluid in individually controllable volume units and a plurality of hydraulic loads. A system of switching valves is configured to create fluid connections between the pump outlets and the loads. A control system commands both the pump and the switching valves, so as to create valve state combinations to satisfy load conditions as demanded by an operator. The number of pump outlets connected to one or more of the loads is changeable to satisfy the flow required of the load due to the operator demand, each pump outlet being commanded to produce a flow depending on the status of other outlets connected a load to which the outlet is connected and the operator demand for that load. 1. A fluid power system , comprising:a prime mover;a pump/motor unit comprising a plurality of independently-variable fluid working machines for delivering and absorbing fluid flow, each of which is capable of delivering or absorbing fluid in individually-controllable volume units through a respective outlet;a plurality of hydraulic loads;a system of switching valves configured to create fluid connections between the outlets of the fluid working machines and the loads, each valve having discrete states, whereby certain combinations of states of the valves serve selectively to supply fluid to one or more loads from one or more said outlets in one or more distinct and separate fluid paths; anda control system commanding both the plurality of independently-variable fluid working machines and the switching valves, so as to create valve state combinations to satisfy load conditions as demanded by an operator, the valve state combination being changeable such as to change the number of fluid-working machine outlets connected to one or more of the loads to satisfy the flow required of the load conditions due to the operator demand;each fluid working machine being commanded to ...

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10-08-2017 дата публикации

Hydraulic Drive Device with Load-Dependent Pressure Distributor

Номер: US20170227025A1
Принадлежит:

A hydraulic drive device includes a pump, a hydraulic machine, and a tank. The hydraulic machine is connected fluidically to first and second fluid lines, which are configured to be connected fluidically to the tank or the pump via an adjustable main valve. The device further includes a first valve with a continuously adjustable first orifice. Pressure fluid is configured to be conducted out of the second fluid line via the first orifice and into the tank. The first valve is acted upon in the closing direction of the first orifice by a first spring and acted upon in the opposite direction by the pressure at a control point. The control point is connected fluidically to the tank via a first throttle device, connected via a second throttle device to the first fluid line, and connected to the first fluid line via a third throttle device and a second valve. 1. A hydraulic drive device , comprising:a pump;a tank;a hydraulic machine connected fluidically to a first fluid line and a second fluid line;an adjustable main valve configured optionally to fluidically connect the first and second fluid lines to the tank or the pump; anda first valve having a continuously adjustable first orifice,wherein pressure fluid is configured to be conducted out of the second fluid line via the first orifice into the tank,wherein the first valve is (i) acted upon in a closing direction of the first orifice by a first spring and (ii) acted upon in a direction opposite the closing direction by the pressure at a control point, andwherein the control point is (i) connected fluidically to the tank via a first throttle device, (ii) connected via a second throttle device to the first fluid line, and (iii) connected to the first fluid line via a third throttle device and a second valve.2. The hydraulic drive device according to claim 1 , wherein the second valve has an adjustable second orifice claim 1 , the second valve acted upon by the pressure in the second fluid line in a closing direction of ...

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09-07-2020 дата публикации

Hydraulic Power Pack System

Номер: US20200217335A1
Принадлежит:

A hydraulic power pack for use in a hydraulic system includes a reservoir configured to receive hydraulic fluid. A pump is in communication with the reservoir and is fluidly connectable to the hydraulic system. The pump is configured to pump hydraulic fluid from the reservoir into the hydraulic system when connected thereto. A hydraulic fluid sensor is fluidly connectable to the hydraulic system to sense a fluid characteristic of the hydraulic fluid within the hydraulic system. A variable speed drive is operatively coupled to the pump and the hydraulic fluid sensor to receive sensor data therefrom, with the variable speed drive being configured to generate a pump control signal based on the received sensor data. The pump is configured to operate at various speeds based on the pump control signal received from the variable speed drive. 1. A hydraulic power pack for use in a hydraulic system , the hydraulic power pack comprising:a reservoir configured to receive hydraulic fluid;a pump in communication with the reservoir and fluidly connectable to the hydraulic system, the pump being configured to pump hydraulic fluid from the reservoir into the hydraulic system when connected thereto;a hydraulic fluid sensor fluidly connectable to the hydraulic system to sense a fluid characteristic of the hydraulic fluid within the hydraulic system;a variable speed drive operatively coupled to the pump and the hydraulic fluid sensor to receive sensor data therefrom, the variable speed drive being configured to generate a pump control signal based on the received sensor data;the pump being configured to operate at various speeds based on the pump control signal received from the variable speed drive.2. The hydraulic power pack recited in claim 1 , further comprising a motor coupled to the variable speed drive and the pump claim 1 , the motor being configured to drive the pump in accordance with the pump control signal.3. The hydraulic power pack recited in claim 1 , wherein the ...

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17-08-2017 дата публикации

Actuator Controller and Method for Regulating the Movement of an Actuator

Номер: US20170234333A1
Принадлежит: FESTO AG & CO. KG

An actuator controller for actuating an actuator which can be operated fluidically, having a feed line for an inflow of the working fluid to an actuator connector and having a discharge line for an outflow of the working fluid to a fluid outlet, wherein the feed line is assigned a feed line valve and the discharge line is assigned a discharge valve, which valves are configured in each case to influence a volumetric fluid flow at the actuator connector, and having a control device for actuation of the feed line valve and the discharge valve. A throughflow sensor is arranged in a line section between the discharge valve and the fluid outlet, which throughflow sensor is configured for determining a volumetric fluid flow in the discharge line and for providing a throughflow signal. 1. An actuator controller for activating a fluidically operable actuator , the controller comprising a feed line for an inflow of a working fluid from a fluid port to an actuator port and a discharge line for an outflow of the working fluid from the actuator port to a fluid outlet , wherein the feed line is assigned a feed line valve and the discharge line is assigned a discharge line valve , each of which is designed to influence a fluid flow rate at the actuator port , and the controller further comprising a control device for an activation of the feed line valve and the discharge line valve and wherein a flow sensor , which is designed to determine a fluid flow rate in the discharge line and to provide a flow signal , and which is coupled to the control device in order to facilitate a movement control for an actuator movement in a manner which is dependent on the flow signal , is placed in a line section between the discharge line valve and the fluid outlet.2. The actuator controller according to claim 1 , wherein the control device is designed to perform the movement control for an activation of the discharge line valve and/or the feed line valve in a manner which is dependent on the flow ...

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26-08-2021 дата публикации

Construction Machine

Номер: US20210262200A1
Принадлежит: HITACHI CONSTRUCTION MACHINERY CO LTD

To provide a construction machine that can highly precisely control branch flows from a hydraulic pump to a plurality of hydraulic actuators without being affected by load conditions. A controller ( 100 ) has a meter-out valve control section ( 140 ) configured to calculate a target opening area of a second meter-out valve ( 65 a ) ( 65 b ) according to a pressure difference between a supply pressure and a second meter-in pressure, or calculate a target opening area of a first meter-out valve ( 55 a ) ( 55 b ) according to a pressure difference between the supply pressure and the first meter-in pressure.

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26-08-2021 дата публикации

PNEUMATIC VALVE POSITIONER WITH FEEDBACK CONTROLLED FLOW BOOSTER

Номер: US20210262582A1
Принадлежит: FLOWSERVE MANAGEMENT COMPANY

A pneumatically controlled flow booster includes a booster valve plug position sensor that enables control of the flow booster in a feedback loop, for example by a pneumatic valve positioner, thereby providing accurate, high speed, high flow control of both small and large actuator adjustments. Embodiments can accurately control a surge suppression valve over extended valve adjustment ranges and can fully open a surge suppression valve during a trip. The flow booster valve can include a spool and sleeve valve and/or a poppet valve. Embodiments provide bimodal flow boosting, whereby the output flow is less dependent on the valve plug position in a first position range, and more strongly dependent on the valve plug position in a second range. 1. A flow booster valve comprising:a first pneumatic control inlet configured to receive a first pneumatic control gas having a first pneumatic control pressure;a booster valve plug having a variable position within the flow booster valve, wherein a first longitudinal force is applied to the booster valve plug that is proportional to the first pneumatic control pressure;a first flow inlet in gas communication with a first flow outlet, a first gas flow from the first flow inlet to the first flow outlet being variable according to the position of the booster valve plug within the flow booster valve; anda valve plug position sensor configured to provide a sensor output that is indicative of the position of the booster valve plug within the booster valve.2. The flow booster valve of claim 1 , wherein a plug range over which the position of the booster valve plug is variable within the flow booster valve comprises a first position subrange and a second position subrange claim 1 , and wherein the first primary gas flow is more strongly dependent on the position of the booster valve plug when the booster valve plug is within the second position subrange as compared to when the booster valve plug is within the first position subrange.3. ...

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13-11-2014 дата публикации

HYDRAULIC CONTROL DEVICE FOR FORKLIFT

Номер: US20140331662A1
Принадлежит:

A hydraulic control device for a forklift includes a hydraulic pump, a single electric motor for driving the hydraulic pump, an outflow control mechanism provided between a lift cylinder and the hydraulic pump, a flow control valve provided between the outflow control mechanism and a draining portion, and a controller. When a lowering operation of a fork and either forward or rearward mast tilting operations of a mast are performed at the same time, the controller controls the electric motor based on a target speed of the hydraulic pump. The flow control valve controls the flow rate of hydraulic fluid from the lift cylinder to the hydraulic pump and the flow rate from the lift cylinder to the draining portion in accordance with the difference between the actual rotation speed of the hydraulic pump and the target rotation speed of the hydraulic pump. 1. A hydraulic control device for a forklift , whereinthe hydraulic control device selectively raises and lowers a fork by supplying hydraulic fluid to a lift cylinder or discharging hydraulic fluid from the lift cylinder through manipulation of a raising/lowering instruction member,the hydraulic control device tilts a mast to which the fork is attached selectively forward and rearward by supplying hydraulic fluid to a tilt cylinder and/or discharging hydraulic fluid from the tilt cylinder through manipulation of a tilting instruction member,the hydraulic control device comprises:at least one hydraulic pump;a single electric motor for driving the hydraulic pump;an outflow control mechanism arranged between the lift cylinder and the hydraulic pump, wherein the outflow control mechanism permits hydraulic fluid to flow from a bottom chamber of the lift cylinder to the hydraulic pump when the fork is lowered, and the outflow control mechanism prohibits hydraulic fluid from flowing from the bottom chamber of the lift cylinder to the hydraulic pump when the fork is in a stopped state or raised;a flow control valve arranged ...

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24-08-2017 дата публикации

WORKING MACHINE

Номер: US20170241105A1
Автор: Yuzawa Yoshimitsu
Принадлежит:

A working machine is disclosed. A boom supports an arm. An upper revolving body supports the boom. A lower traveling body mounts the upper revolving body in a rotatable state. A hydraulic actuator drives a hydraulic oil while relieving the hydraulic oil. A first pump supplies the hydraulic oil to the hydraulic actuator. A pump state detector detects load of the first pump. A controller reduces a flow rate of the hydraulic oil from the first pump to the hydraulic actuator when the pump state detector detects a predetermined state. 1. A working machine comprising:an arm;a boom that supports the arm;an upper revolving body that supports the boom;a lower traveling body that mounts the upper revolving body in a rotatable state;a hydraulic actuator that drives a hydraulic oil while relieving the hydraulic oil;a first pump that supplies the hydraulic oil to the hydraulic actuator;a pump state detector that detects load of the first pump; anda controller that reduces a flow rate of the hydraulic oil from the first pump to the hydraulic actuator when the pump state detector detects a predetermined state.2. The working machine as claimed in claim 1 , wherein the hydraulic actuator is a hydraulic actuator that opens and closes a grapple supported by the arm.3. The working machine as claimed in claim 2 , further comprising:a second pump that supplies the hydraulic oil to a boom cylinder; anda joining passage that joins a first hydraulic oil discharged from the first pump and a second hydraulic oil discharged from the second pump.4. The working machine as claimed in claim 2 , further comprising:a control valve that switches a flow of the hydraulic oil in order to supply the hydraulic oil discharged from the first pump to the hydraulic actuator; anda relief valve that causes at least a part of the hydraulic oil flowing toward the hydraulic actuator in response to a closing operation of the grapple,wherein the controller reduces a pilot pressure acting on a pilot port of the ...

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01-08-2019 дата публикации

CYLINDER DRIVING DEVICE

Номер: US20190234431A1
Автор: TANAKA Daisuke
Принадлежит: KYB Corporation

A cylinder driving device includes: an electric motor; a pump; a main passage and a main passage; a hydraulic cylinder; an operation check valve and an operation check valve; and a restriction valve and a restriction valve configured to restrict a flow of the working oil directed to the operation check valve and an operation check valve, wherein an opening area of the restriction valve and the restriction valve is reduced in response to an increase in a flow rate of the working oil discharged from the hydraulic cylinder to the main passage and a main passage. 1. A cylinder driving device comprising:an electric motor;a pump configured to be driven by the electric motor and discharge working fluid;a first passage and a second passage respectively connected to the pump, the first passage and the second passage being configured to selectively guide the working fluid from the pump;a fluid pressure cylinder connected to the first passage and the second passage, the fluid pressure cylinder being configured to be operated by the working fluid supplied from one of the first passage and the second passage, the fluid pressure cylinder being configured to discharge the working fluid to the other of the first passage and the second passage when operated;a control valve provided in the second passage, the control valve being configured to allow a flow of the working fluid directed from the fluid pressure cylinder to the pump in response to an increase in a pressure in the first passage while allowing a flow of the working fluid directed from the pump to the fluid pressure cylinder; anda restriction valve provided between the fluid pressure cylinder and the control valve in the second passage, the restriction valve being configured to restrict a flow of the working fluid directed from the fluid pressure cylinder to the control valve, whereinan opening area of the restriction valve is reduced in response to an increase in a flow rate of the working fluid discharged from the fluid ...

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13-11-2014 дата публикации

Method for Configuring a Fluid Control Unit, Computer Program Product and Fluidic System

Номер: US20140336829A1
Принадлежит: Festo SE and Co KG

A method for configuring a fluid control unit including the provision of a processing device with information on the fluid control unit, the moving device and fluid control valves, the determination of possible basic states of the moving device for the fluid control valves and/or of possible movement sequences, and the selection of a basic state and/or of a movement sequence by a user, the transmission, of a respective configuration file to the fluid control unit including open- and/or closed-loop control parameters for the selection of the fluid control valves, the use of the open- and/or closed-loop control parameters from the configuration file in the fluid control unit for selecting the fluid control valves for setting the selected basic state and/or for carrying out the selected movement sequence.

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