ГИДРАВЛИЧЕСКАЯ СИСТЕМА С НАКОПИТЕЛЕМ КИНЕТИЧЕСКОЙ ЭНЕРГИИ

Изобретение относится к системам накопления энергии и к применению таких систем в гидравлической системе грузоподъемных машин. Гидравлическая система содержит гидравлическую жидкость, гидравлическую машину (142), гидравлический контур для подачи жидкости в гидравлический исполнительный механизм (103А, 103В). Гидравлическая машина (142) выполнена с возможностью приема гидравлической жидкости из гидравлического исполнительного механизма (103А, 103В). Гидравлическая система также содержит накопитель (150) кинетической энергии – маховик, соединенный с указанной гидравлической машиной (142). Гидравлическая машина (142) способна передавать энергию от гидравлической жидкости, полученной из гидравлического исполнительного механизма (103А, 103В), в маховик. Достигается повышение КПД гидравлической системы. 6 н. и 16 з.п. ф-лы, 14 ил., 1 табл.

Гидравлическая система фрезерного рабочего оборудования экскаватора

Изобретение относится к гидравлическим системам объемного гидропривода и предназначено для управления рабочим оборудованием дорожно-строительных машин, в частности гидравлического экскаватора. Техническим результатом является упрощение конструкции гидравлической системы гидропривода экскаватора для управления фрезерным рабочим оборудованием, для привода которого требуется гидроцилиндр и гидромотор. Гидравлическая система фрезерного рабочего оборудования экскаватора включает гидробак, насос, гидроцилиндр, гидромотор, предохранительный и переливной клапан с фильтром, трехпозиционные гидрораспределители с ручным и электромагнитным управлением, соединительные гидролинии. Гидроцилиндр с гидромотором и гидрораспределителем с электромагнитным управлением выполнены отдельным блоком, и внутри гидроцилиндра расположены гидролинии для движения рабочей жидкости к гидрораспределителю с электромагнитным управлением и гидромотору. 2 ил.

КОВШ ЭКСКАВАТОРА

Изобретение относится к горнодобывающей технике и может быть использовано в экскаваторах. Ковш экскаватора, содержащий переднюю, заднюю и боковые стенки, откидное днище, шарнирно соединенное с задней стенкой, и механизм открывания откидного днища в виде гидроцилиндров, поршневые полости которых сообщены через гидродроссель с гидроаккумулятором, включающий управляемый гидроклапан, редукционный гидроклапан и обратный гидроклапан, причем в гидролинию, соединяющую поршневые полости гидроцилиндров с гидроаккумулятором, установлен управляемый гидроклапан, имеющий орган управления с грузом и выполненный с возможностью открытия только при горизонтальном положении днища ковша, при этом в гидролинию между управляемым гидроклапаном и гидроаккумулятором установлены параллельно регулируемый гидродроссель и обратный гидроклапан, а к гидроаккумулятору присоединен входом обратный гидроклапан и редукционный гидроклапан. Технический результат заключается в повышении производительности, надежности и безопасности ...

ГИДРАВЛИЧЕСКАЯ СИСТЕМА ДЛЯ МАШИНЫ, МАШИНА И СПОСОБ УПРАВЛЕНИЯ ГИДРАВЛИЧЕСКОЙ СИСТЕМОЙ

... 1. Гидравлическая система (10) для машины, содержащая первый насос (12) постоянной производительности и второй насос (14) постоянной производительности для подачи рабочей жидкости в гидроцилиндр, приводящий в действие рабочее оборудование машины, а также включающая в себя гидрораспределитель (16), имеющий первое входное отверстие (Р1), гидравлически связанное с первым насосом (12) постоянной производительности, и второе входное отверстие (Р2), гидравлически связанное со вторым насосом (14) постоянной производительности, первое выходное отверстие (А), гидравлически связанное с гидроцилиндром, приводящим в действие рабочее оборудование машины, и второе выходное отверстие (Т), гидравлически связанное с баком (18), отличающаяся тем, что гидрораспределитель (16) имеет первое рабочее положение, в котором рабочая жидкость, закачиваемая как первым насосом (12) постоянной производительности, так и вторым насосом (14) постоянной производительности, направляется в гидроцилиндр, и второе рабочее положение ...

Гидравлическая система дозируемого управления для горнодобывающей машины

Предложена гидравлическая система, предназначенная для управления по меньшей мере двумя гидравлическими исполнительными механизмами посредством узла клапанов управления дозированием. Гидравлическая система является особенно преимущественной для управления поворотным рычагом горнодобывающей машины для нижней зарубки в соответствии с по меньшей мере двумя режимами работы, включая режим холостого хода и режим зарубки. В частности, управление гидравлическими исполнительными механизмами может быть обеспечено путем количественного изменения скорости потока и давления текучей среды. 2 н. и 14 з.п. ф-лы, 6 ил.

ГИДРОКЛАПАННОЕ УСТРОЙСТВО

... 1. Гидроклапанное устройство, содержащее: ! первое отверстие (L) двигателя и второе отверстие (N) двигателя в гидравлическом двигателе двустороннего действия (D), в частности гидравлическом цилиндре двустороннего действия, ! емкость (T) и насос (I), !ручной клапан (H), который установлен таким образом, что он соединяет отверстия (L, N) двигателя с емкостью (T) и насосом (I), причем ручной клапан (H) имеет два открытых положения, где насос (I) в первом открытом положении посредством трубопровода (F) соединен с первым отверстием (L) двигателя, а емкость (T) посредством трубопровода (G) соединена со вторым отверстием (N) двигателя, и где насос (I) во втором открытом положении посредством трубопровода (G) соединен со вторым отверстием (N) двигателя, а емкость (T) посредством трубопровода (F) соединена с первым отверстием (L) двигателя, и ! первый невозвратный клапан (1A, 8), который установлен между насосом (I) и вторым отверстием (N) двигателя и открывается в сторону второго отверстия (N) ...

FAHRBARE ERDBEWEGUNGSMASCHINE, INSBESONDERE RADFAHRZEUG, WIE BAGGER O.DGL.

Hybrid Transmission Module for Work Vehicles

Es wird ein Hybridgetriebemodul für ein Arbeitsfahrzeug bereitgestellt. Das Arbeitsfahrzeug weist ein Chassis und eine von dem Chassis getragene Antriebsquelle auf, und das Hybridgetriebemodul umfasst eine Befestigungshalterung, die zur Befestigung an dem Chassis und/oder der Antriebsquelle konfiguriert ist, eine Getriebeanordnung, die an der Befestigungshalterung befestigt ist, und eine elektrohydraulische Antriebsanordnung, die einen an der Befestigungshalterung befestigten Verteiler umfasst. An dem Verteiler sind eine Hydraulikpumpe und eine elektrische Maschine befestigt und er ist dazu konfiguriert, Drehleistung von der Antriebsquelle auf die Hydraulikpumpe und die elektrische Maschine zu übertragen. Die elektrische Maschine treibt zumindest zum Teil die Getriebeanordnung an.

Steuern der Bewegung einer Maschine unter Verwendung von Sensorfusion

Ein Verfahren (700, 800) zum Steuern der Bewegung einer Maschine (101) kann das Empfangen von einer Mehrzahl von IMU-Modulen (112, 114, 116), die an einer entsprechenden Mehrzahl von Komponenten (104, 150, 152, 154) der Maschine (101) montiert sind, einer Mehrzahl von Signalen enthalten, die Ausrichtungsmessungen und Bewegungsmessungen für die Komponenten (104, 150, 152, 154) der Maschine (101) anzeigen, an denen die Mehrzahl von IMU-Modulen (112, 114, 116) montiert ist. Die IMU-Module (112, 114, 116) enthalten eine entsprechende Anzahl von Zustandsschätzern (214, 220, 226, 232) und bilden ein Maschennetz (200) aus, das kommunikativ mit einem Kommunikationsbus (250) gekoppelt ist. Das Verfahren (700, 800) kann auch das Verschmelzen der Signale, das Bestimmen von Schätzungen von Ausgabeausrichtungsdaten und Ausgabebewegungsdaten für die Komponenten (104, 150, 152, 154) der Maschine (101) basierend auf den verschmolzenen Signalen, das Bestimmen eines Echtzeitwerts für mindestens eine von ...

Verbrennungsmotorsteuervorrichtung und Baumaschine

Eine Steuereinrichtung (6) hat eine Pumpenantriebsleistungsbegrenzungseinheit (61), die so aufgebaut ist, dass sie eine Pumpenantriebsleistung, die eine zum Antreiben einer Hydraulikpumpe (3) verwendete Leistung ist, auf der Basis eines Drucks eines durch die Hydraulikpumpe abgegebenen Betriebsöls begrenzt, wenn ein Zustand vorliegt, bei dem ein Teil des durch die Hydraulikpumpe abgegebenen Betriebsöls freigegeben wird, da der Druck des durch die Hydraulikpumpe abgegebenen Betriebsöls gleich wie oder höher als ein zuvor festgelegter Entlastungsdruck geworden ist; und eine Verbrennungsmotorabgabeleistungssteuereinheit (63), die so aufgebaut ist, dass sie eine Abgabeleistung des Verbrennungsmotors so steuert, dass eine Solldrehzahl, die eine als ein Sollwert des Verbrennungsmotors festgelegte Drehzahl ist, gleich wie oder höher als ein Wert zu einem Zeitpunkt, bei dem das Begrenzen der Pumpenantriebsleistung gestartet wird, wird.

Motorsteuervorrichtung

Es wird eine erste Sollmotorgeschwindigkeit in Reaktion auf einen von einer Befehlseinheit befohlenen Befehlwert eingestellt, und es wird eine zweite Sollmotorgeschwindigkeit, die niedriger als die erste Sollmotorgeschwindigkeit ist, auf Grundlage der ersten Sollmotorgeschwindigkeit eingestellt. Ein Verringerungsbereich von der ersten Sollmotorgeschwindigkeit zu der zweiten Sollmotorgeschwindigkeit wird entsprechend einem Typ eines von einem Betriebshebel betriebenen Hydraulikbetätigers oder einer Kombination von mehreren von einem Betriebshebel betriebenen Hydraulikbetätigern eingestellt.

HYDRAULIKANLAGE

Steuerung für die Ölbetriebstemperatur einer hydraulischen Antriebseinrichtung

Eine Steuereinrichtung 12 zum Steuern eines Flussratensteuerventil 11 enthält eine erste Recheneinrichtung zum Bestimmen einer Energiekomponente, die Hydrauliköl erwärmt, eine erste Einstelleinrichtung zum Einstellen eines zweiten Verhältnisses zwischen einer Flussrate durch einen Ölkühler 9 und der Energiekomponente, wie diese gemäß einer experimentell Oder empirisch bekannten eingestellt wird, eines ersten Verhältnisses zwischen der Flussrate durch den Ölkühler 9 und einer Menge einer Wärmestrahlung von dem Ölkühler 9 und wie durch Ersetzen der Menge der Wärmestrahlung von dem Ölkühler 9 in dem ersten Verhältnis zu der Energiekomponente erhalten, und eine zweite Recheneinrichtung zum Bestimmen der Flussrate durch den Ölkühler 9 auf der Grundlage der Energiekomponente, bestimmt durch die erste Recheneinrichtung und das zweite Verhältnis, das durch die erste Einstelleinrichtung eingestellt wird und die eingerichtet ist, um dass Flussratensteuerventil 11 gemäß der Flussrate durch den Ölkühler ...

HYDRAULISCHES VENTIL

Hydraulische Antriebseinrichtungen fuer Baumaschinen

Ventileinrichtung für einen doppelt wirkenden hydraulischen Verbraucher

Ventileinrichtung für einen doppelt wirkenden hydraulischen Verbraucher mit einer Anhebeseite und einer Absenkseite, wobei die Ventileinrichtung ein Wegeventil aufweist, das mit einer Pumpe (P), einem Behälter (T), der Anhebeseite (A) und der Absenkseite (B) des Verbrauchers (2) verbunden ist und eine Sperrstellung, eine Stellung zum Anheben einer am Verbraucher (2) anstehenden Last sowie eine Stellung zum Absenken einer am Verbraucher (2) anstehenden Last aufweist, und eine in einem Druckmittelkanal (11), der von dem Wegeventil (3) zur Anhebeseite (A) geführt ist, angeordnete Sicherungseinrichtung (4) aufweist, die von einem Sperrventil (35) gebildet ist, sowie eine Einrichtung zur Einspeisung des der Anhebeseite (A) des Verbrauchers (3) ausströmenden Druckmittels zur Absenkseite (B) des Verbrauchers (3) in einer Stellung des Wegeventils (3) zum Absenken einer am Verbraucher (3) angreifenden Last aufweist, dadurch gekennzeichnet, dass die Einrichtung zur Einspeisung einen am Wegeventil ...

Actuator controller

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.

Displacement control system for variable displacement type hydraulic pump

Hydraulic pressure control device of construction machinery

A hydraulic pressure control device of construction machinery enabling an increase in operability and working efficiency by suppressing a variation in flow rate occurring before and after the switching of a merging-separating valve, an increase in energy efficiency by accurately determining the switching timing of the merging-separating valve to suppress the energy loss of a pressure compensating valve due to pressure loss, and an increase in working efficiency in the compound motion of a plurality of hydraulic actuators. When a controller (14) determines that the necessary flow rates (Q1d, Q2d) of the first and second hydraulic actuators (4, 7) are less than the maximum discharge flow rate (Qmax) of each of the first and second variable displacement hydraulic pumps (2, 3) when the first merging-separating valve (13) and the second merging-separating valve (21) are set to a merging position (A) (When determination in S3 is YES), the switching of the first and second merging-separating valves ...

Hydraulic drive system of construction machine

This hydraulic drive system for construction machinery is provided with: a swing motor; a swing operation device that outputs a swing operation signal according to the inclination angle of an operation lever; a swing direction switching valve that includes a spool and a drive unit which receives a command current and drives the spool, and that increases the supply amount of a working fluid to the swing motor and the discharge amount of the working fluid from the swing motor as the command current increases; a control device that supplies, to the swing direction switching valve, a command current that increases as the swing operation signal increases; and a pressure sensor that detects the outflow pressure of the swing motor. When the swing operation signal has decreased, the control device supplies a command current to the swing direction switching valve when the outflow pressure of the swing motor as detected by the pressure sensor increases past a threshold, thereby maintaining the movement ...

Hydraulic drive system of construction machine

Hydraulic system

A hydraulic system for an electric working vehicle or hybrid working vehicle of the kind having an electric source of power and an alternative source of power, the hydraulic system comprising: one or more hydraulically actuated devices; and a hydraulic pump configured to supply hydraulic fluid to the one or more hydraulically actuated devices; wherein the hydraulic pump is configured to operate in a low output state when a flow of hydraulic fluid is not required by the one or more hydraulically actuated devices; and wherein the hydraulic system is configured to use hydraulic fluid supplied by the hydraulic pump in the low output state for one or more auxiliary functions of the hydraulic system.

Improvements relating to a Backhoe.

... 1,163,073. Scoop-arm machines. OKLAHOMA STATE UNIVERSITY OF AGRICULTURE & APPLIED SCIENCE. 5 Sept., 1967, No. 40599/67. Heading E1F. A backhoe mounted on a tractor 10 comprises a boom 12 including a lift arm 16 pivoted by a hydraulic jack 22 and a crowd arm 18 pivoted by a hydraulic jack 24 and provided with a bucket 20 pivoted by a hydraulic jack 26, the boom movements during a digging cycle being controlled automatically by a hydraulic circuit including means which are responsive to over pressure in the jack 24 to automatically operate the jack 26 to cause decrease in the bucket digging attitude and which are responsive to simultaneous overload-pressures in the jacks 24, 26 to automatically operate the jack 22 to cause decrease in the lift arm digging attitude. The hydraulic circuit is illustrated in Fig. 2 (not shown) and the operation is started when the lift arm 16 is low and the crowd arm 18 and the 'bucket 20 extends outwardly in the maximum digging attitude. To start digging the ...

Capacity control device for variable capacity hydraulic pump

HEATING SYSTEME FOR VEHICLES

Hydraulic system

Hydraulic drive system for construction machinery

Controller unit and liquid-pressure driving system

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.

Machines of public works or washing, such as mechanical shovels, cranes or analogues.

Improvements with the machines of public works or handling, such as the mechanical shovels, cranes or analogues.

Machine of washing functioning in device of loading, crane and excavator.

DRIVE DEVICE OF A HYDRAULIC CYLINDER FOR ENTERPRISE

HYDRAULIC VALVE DEVICE

HYDRAULIC DUAL-CIRCUIT SYSTEM AND ZUSAMMENSCHALTVENTILANORDNUNQ

Loading machine control device and control method

A movement processing unit of the present invention generates an operating signal for a work machine and a turning body for moving a bucket to a loading point, on the basis of an instruction to start automatic movement of the bucket. A stop processing unit brakes the turning of the turning body on the basis of an instruction to stop automatic movement of the bucket, and further generates an operating signal that causes the work machine to withdraw if the height of the bucket is lower than the loading point.

Control system for a boom system in a working machine movable on a terrain

Inertia body drive device

ROAD PLANING MACHINES

Pump unit

A pump unit includes a variable capacity pump, and a balanced piston mechanism having a piston body, connected to an operation section of a variable swash plate, provided inside a cylinder, capable of sliding in an axial direction. The balanced 5 piston mechanism has first, second and third pressure receiving chambers provided in the cylinder. Primary side and the secondary side working fluid pressures of an actuator switching valve are respectively introduced to the first receive pressure chamber and the second pressure receiving chamber, and a set pressure that has been previously set, corresponding to a working fluid differential pressure arising before and 10 after passing through the actuator switching valve, in a steady state of the operating position of the actuator switching valve is introduced to the third pressure receiving chamber. 2901053_1 (GHMatters) P88582.AU 20/10/11 N 1co coN N CC co (0 It 11- ...

Loading machine control device and control method

Provided is a loading machine control device. When a loading instruction signal is received, the control device outputs operation signals for a machine and a slewing structure for moving the machine to a loading point. When an excavation operation signal is received in the case where the facing orientation of the slewing structure is included in a first region from a start orientation which is a facing orientation of the slewing structure faces when the loading instruction signal is received to a predetermined reference orientation, the control device does not output an excavation operation signal. When an excavation operation signal is received in the case where the facing orientation of the slewing structure faces is included in a second region from a reference orientation to a finish orientation which is a facing orientation of the slewing structure when the machine is located at a loading point, the control device outputs an excavation operation signal.

HYDRAULIC MAKE-UP VALVE

HYDRAULIC CONTROL SYSTEM FOR ELEVATING SCRAPER

HYDRAULIC CONTROL SYSTEM FOR LOAD SUPPORTING HYDRAULIC MOTORS

CONTROL CIRCUIT FOR AN ATTACHMENT MOUNTING DEVICE

A control circuit (400, 500) for an attachment mounting device (29) that has a closed position for securing an implement (36) and an opened position for releasing an implement (36). The control circuit (400, 500) includes at least one hydraulic actuator (402, 403, 502, 503), a control valve (408, 508) and an auto-close feature (428, 528). The control valve (408, 508) has at least a first energized position (413, 513) and a second energized position (415, 515). The first energized position (413, 513) applies pressurized fluid to the at least one hydraulic actuator (402, 403, 502, 503) to actuate the attachment mounting device (29)\ into the closed position. The second energized position (415, 515) applies pressurized fluid to the at least one hydraulic actuator (402, 403, 502, 503) to actuate the attachment mounting device (29) into the opened position. The auto-close feature (428, 528) is configured to be activated after the control valve (408, 508) is in the first energized position (413 ...

SYSTEMS AND METHODS FOR MONITORING A FLUID SYSTEM OF A MINING MACHINE

A method of monitoring a fluid system of a mining machine. The method including sensing a pressure level of a fluid in the fluid system of the mining machine to generate pressure level data; analyzing the pressure level data to detect pressure level deviations; determining at least one selected from the group of when a frequency of the pressure level deviations exceeds a predetermined frequency, and when the fluid pressure level fails to reach a threshold within a predetermined reaction time period; and outputting an alert in response to the determination.

HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE

A hydraulic system provided with a relief valve for a construction machine is disclosed, which can reduce a discharge flow rate of a hydraulic pump when a relief valve is operated. The hydraulic system includes an attachment actuator connected to the hydraulic pump to be driven by an operation of the attachment operation device, a control valve installed in a flow path between the hydraulic pump and the attachment actuator, an orifice installed in a flow path branched from a discharge flow path of the hydraulic pump, a relief valve installed on a downstream side of the orifice in the flow path, and a controller outputting a control signal to a flow control valve of the hydraulic pump so as to reduce a discharge flow rate of the hydraulic pump when a difference between pressures before and after the orifice exceeds a predetermined pressure value of the relief valve.

CONTROL APPARATUS FOR A CONSTRUCTION MACHINE

The present invention relates to a control apparatus for a construction machine such as a hydraulic excavator, and makes it possible to make a variation of an instruction value to a hydraulic cylinder smooth even if an operation member or the like is operated suddenly upon starting of working or the like. To this end, the control apparatus for a construction machine of the present invention is applied to a construction machine wherein arms (200, 300) supported on a machine body (100) side and a working member (400) supported on the arm members (200, 300) are operated by cylinder type actuators (120 to 122), and includes operation members (6, 8) for operating the arm members (200, 300) and the working member (400), target moving velocity setting means (101) for setting a target moving velocity of the working member (400) so that a target moving velocity characteristic upon starting of an operation by the operation members (6, 8) exhibits a characteristic of the same type even if it is differentiated ...

Installation hydraulique d'une machine mobile pour la manutention de matériaux

Servomotor

Traktor-Bagger

Hydraulische Antriebseinrichtung

Verfahren und Vorrichtung zum Betrieb von hydraulisch betätigten Zusatzgeräten, insbesondere für die Erdbewegung, durch eine Hydraulikanlage des Trägerfahrzeuges

Hydraulischer Antrieb für geradlinig hin und her gehende Teile von Arbeitsmaschinen, insbesondere Werkzeugmaschinen

Hydraulischer Antrieb für geradlinig hin und her gehende Teile

Mit einer Hydraulikpumpe zur Beaufschlagung der Arbeitszylinder und Fahrwerke ausgerüstetes Raupenfahrzeug

Schaltung für einen Hydraulikbagger

CONSTRUCTION MACHINERY

Reel hydraulic device with reel free quick-release floating control

The invention provides a reel hydraulic device with reel free quick-release floating control. The reel hydraulic device is characterized by comprising a cable reel hydraulic motor and at least two oil pipe reel hydraulic motors, wherein the cable reel hydraulic motor and each oil pipe reel hydraulic motor are respectively connected with a free quick-release floating control valve of a built-in first check valve in parallel; each free quick-release floating control valve is connected with a three-position four-way solenoid directional valve in parallel; all the three-position four-way solenoid directional valves are cascaded; each cascaded three-position four-way solenoid directional valve is provided with a pressure oil inlet end and an oil return valve block end in a leading-out mode; an electric proportional relief valve is connected between the pressure oil inlet end and the oil return valve block end in a bridging mode; and a fourth check valve is connected between the pressure oil ...

Load sensitivity-based excavator rotary energy-saving hydraulic system and control method

Electric drive of mobile apparatus

Construction machinery or lifting, such as excavators, cranes or the like

HYDRAULIC SYSTEM

SYSTEME D'ENTRAINEMENT HYDROSTATIQUE POUR EXCAVATEUR

A.SYSTEME D'ENTRAINEMENT HYDROSTATIQUE POUR EXCAVATEUR. B.SYSTEME CARACTERISE EN CE QUE, AU MOINS QUELQUES-UNS DES ORGANES DE CONSTRUCTION QUE CONSTITUENT DES POMPES 6, 7, DISTRIBUTEUR, BLOC DE COMMANDE 8, 9, 10, PASSAGE TOURNANT 11, SONT ASSEMBLES EN UN SEUL BLOC.

Hydraulic ram with controlled fluid flow - has fill valves connected to pressurised fluid source which prevents formation of air pockets

Hydraulic device of control of a pump.

Apparatus for bulk materials[...] of

Plough tractor power takeoff control valve - consists of two ducts for hydraulic fluid in block, with slide piece in lowered or normal position

System of pneumatic control of two pairs of receivers in particular for control of crawler-mounted assembled motorized frame

작업 기계의 유압 제어 장치

... 본 발명은 연동에 의한 유압 액추에이터의 속도 저하를 경감하면서, 분류에 의한 손실을 저감한다. 제1 유압 액추에이터(6)와, 한쪽의 유압 펌프(20a)와, 제2 유압 액추에이터(7)와, 다른 쪽의 유압 펌프(20c)를 구비하고, 제1 유압 액추에이터(6) 및 제2 유압 액추에이터(7)의 동작 지시가 나와 있는 것을 검출하는 동작 지시 검출 수단(101-104)과, 제1 유압 액추에이터(6) 및 제2 유압 액추에이터(7)의 동작 지시량에 따라, 한쪽의 유압 펌프(20a)의 토출 유량과 다른 쪽의 유압 펌프(20c)의 토출 유량을 각각 개별로 조절 가능한 펌프 유량 제어 수단(100)을 구비하고, 펌프 유량 제어 수단(100)은 제1 유압 액추에이터(6)와 제2 유압 액추에이터(7)가 동시에 작동하고 있는 경우, 제1 유압 액추에이터(6)가 작동하고 제2 유압 액추에이터(7)가 작동하고 있지 않은 경우보다도 한쪽의 유압 펌프(20a)의 토출 유량을 증가시킨다.

HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE

The purpose of the present invention is to provide a hydraulic circuit for a construction machine having a circuit configuration capable of increasing pressure of regenerative pressured oil. Boom cylinders (3, 4) are arranged in parallel with respect to the boom (12). When a boom where pressured oil is supplied to rod side chambers (3b, 4b) is descended, a head side chamber (4a) of a second boom cylinder (4) is connected to a tank passage (26). Moreover, when the boom is descended, a blocking valve (7) is switched to a blocking position (7b) restricting movement of the pressured oil from the head side chamber (3a) of a first boom cylinder (3) to the head side chamber (4a) of a second boom cylinder (4). Moreover, a regenerative valve (8) is switched to a communication position (8a) allowing the pressured oil to flow to a regenerative passage (25). The hydraulic circuit (100) operates in the above configuration. COPYRIGHT KIPO 2015 ...

작업 기계의 유압 제어 장치

... 블리드 오프 제어에 의한 유압 펌프의 토출 유량의 스로틀 오프의 손실을 저감시켜, 에너지 효율을 향상시킴과 함께, 유압 펌프의 토출 압력을 조작 레버 장치의 조작량에 따라 제어 가능하게 하고, 조작 성능도 향상시킨다. 컨트롤러(6)는 조작량 검출기(20A, 20B)로부터의 조작량 신호에 기초하여, 조작량 신호가 증가하는 것에 따라서 증가하는 목표 펌프 토출 압력을 산출하는 목표 펌프 압력 설정부(32)와, 조작량 신호에 기초하여, 조작량 신호가 증가하는 것에 따라서 증가하는 펌프 유량 상한값을 산출하는 펌프 유량 상한 설정부(33)를 갖고, 목표 펌프 압력 설정부(32)에서 산출한 목표 펌프 토출 압력과, 펌프 유량 상한 설정부(33)에서 산출한 펌프 유량 상한값과, 압력 검출기(21)에서 검출한 유압 펌프(2)의 토출 압력에 기초하여 유압 펌프(2)의 틸팅량이 제어된다.

HYDRAULIC DRIVE DEVICE FOR OPERATING MACHINE

According to the present invention, provided is a hydraulic drive device capable of improving duel efficiency by effective utilization of a pump capacity of a hydraulic pump. The device has a controller (30). The controller (30) comprises: a calculation unit (32) calculating the number of temporary target engine rotation corresponding to an operating amount of an engine operating member; a calculation unit (34) calculating a first control target pump capacity corresponding to an operating amount of an actuator operating member and a temporary target pump capacity based on a second control target pump capacity corresponding to pump load pressure; and a command unit (36) outputting a command by calculating the number of a final target engine rotation and a final target pump capacity. The command unit (36) calculates a target pump discharge amount from the number of temporary target engine rotation and temporary target pump capacity, setting a final target pump capacity to be greater than ...

HYBRID CONSTRUCTION MACHINE

작업 기계의 유압 제어 장치

... 복수의 유압 펌프로부터 압유를 공급 가능한 특정 액추에이터를 구비하여 에너지 절약화된 작업 기계의 유압 제어 장치를 제공한다. 제 1 유압 액추에이터와 연통 가능한 제 1 유압 펌프 및 제 2 유압 펌프와, 제 1 유압 펌프가 토출하는 압유를 탱크로 환류 가능한 제 1 제어 밸브와, 제 1 유압 액추에이터의 부하를 검출하는 부하 검출부를 구비한 작업 기계의 유압 제어 장치로서, 제 1 유압 액추에이터의 부하의 증가에 따라서, 제 1 유압 펌프와 탱크의 연통 면적을 확대하도록 제 1 제어 밸브를 구동하는 제어 밸브 구동부와, 제 1 유압 펌프와 제 2 유압 펌프로부터 제 1 유압 액추에이터로 압유를 공급하고 있는 경우에 있어서, 제 1 유압 액추에이터의 부하의 증가에 따라서, 제 1 유압 펌프의 토출 유량을 저감하는 제어를 행하는 유량 제어부를 구비하였다.

유압 실린더의 스트로크 동작 진단 지원 장치

... 유압 실린더에 배치되고 상기 유압 실린더의 스트로크 길이를 계측하는 스트로크 센서 (10) 와, 스트로크 센서 (10) 에 의한 상기 스트로크 길이의 계측값을 리셋하는 리셋 기준점을 계측하는 로터리 인코더 (20) 및 자력 센서 (20a) 와, 상기 유압 실린더의 스트로크 엔드 위치를 검출하는 스트로크 엔드 검출 처리부 (30a) 와, 상기 리셋 기준점 및/또는 상기 스트로크 엔드 위치를 검출한 경우에, 상기 스트로크 길이의 계측값을 교정하는 교정 처리부 (30b) 와, 스트로크 센서 (10) 에 의한 스트로크 길이의 계측값 및 교정 처리부 (30b) 에 의한 교정 상태를 적어도 화면 표시하는 스탠다드 모니터 (31) 를 구비하고, 스탠다드 모니터 (31)는, 로터리 인코더 (20) 에 의한 상기 스트로크 길이의 계측값의 연속 시간 변화를 표시한다.

Hydraulic devices such as loading shovels, mobile cranes, trenching tools and the like.

Arbetsfordon

HYDRAULIC SHOVEL

In order to provide a hydraulic shovel with which the erosion of a design surface by a work machine can be suppressed: a boom-lowering proportional solenoid valve is provided to a boom-lowering pilot pipe line that is connected to a boom-lowering pilot port; a first pressure sensor detects a pressure generated in the boom-lowering pilot pipe line between an operation lever and the boom-lowering proportional solenoid valve; a controller controls the degree of opening of the boom-lowering proportional solenoid valve on the basis of the pressure detected by the first pressure sensor; and the controller gradually increases, from zero, an electric current value that is output to the boom-lowering proportional solenoid valve.

Wheel loader

A transmission for a wheel loader includes first and second oil accumulating parts, a communication oil path, a horizontal hole and a vertical hole. The first oil accumulating part accumulates scattered lubricating oil. The second oil accumulating part is mounted to an end of an output shaft below the first oil accumulating part, and accumulates the lubricating oil from the first oil accumulating part. The communication oil path allows the first and second oil accumulating parts to communicate with each other. The horizontal hole extending axially is formed in the rotary shaft, and communicates with the second oil accumulating part. The vertical hole communicating with the horizontal hole is formed in the output shaft, and directs the lubricating oil accumulated in the second oil accumulating part to the lubricated part when the output shaft is rotated at a rotational speed lower than a predetermined rotational speed.

Shovel

A shovel may be provided with a main pump, hydraulic actuators including a swing hydraulic motor, a control valve that controls a flow of a working oil between the main pump and the hydraulic actuators, and an accumulator part that releases the working oil between the main pump and the control valve, and between the swing hydraulic motor and the control valve. The accumulator part may release the working oil at an upstream of the main pump.

Hydraulic control system

A hydraulic control system has first and second actuators that can be selectively moved to a second operating position dependant upon the pressure of hydraulic fluid being simultaneously transmitted thereto through a common conduit. The force of the springs of the first and second actuators is selected so that when the pressure of the hydraulic fluid is at a preselected low pressure, only one of the actuators is moved to its second position and both of the actuators is moved to their second positions when the fluid is at a preselected high pressure. The use of a common conduit for carrying fluid to the actuators eliminates the expense and complexity of providing another flow path between rotatable parts of a vehicle.

Hydraulic control device of a working machine

A hydraulic control apparatus for a working machine in which a flow rate and a direction of pressure oil discharged from a hydraulic pump are controlled by a control valve to supply it to a swing motor, comprising: a bleed-off oil path for bleeding off a part of the pressure oil supplied to the swing motor, a cut valve provided on the bleed-off oil path to adjust a bleed-off amount, a controller for controlling the cut valve through a solenoid proportional valve, and pressure sensors for detecting an operating amount of a remote control valve for swing, characterized in that the controller sets the bleed-off amount according to the operating amount detected by the pressure sensors, controls an opening area of the cut valve on the basis of the bleed-off amount set, and suppresses the shock when sudden swinging operation takes place.

Working machine

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.

METHOD FOR POSITIVE DRIVE OF ENDLESS TRACK FOR COMPACT TRACK LOADER AND CONSTRUCTION EQUIPMENT

Compact track loaders include a main body having a pair of drive shafts extending from opposing sides of the main body and an engine which drives the pair of drive shafts, and two track suspension systems, where each of the two track suspension systems is securely attached to each drive shaft of the pair of drive shafts, and the suspension system includes a positive drive wheel, a chassis, a front idler, a rear idler, and a plurality of rollers. An endless track is securely and movingly mounted onto each of the track suspension systems, and the endless track includes an elongate carcass, an outer portion having a plurality of ground engaging tread lugs, and an inner portion having a plurality of elastomeric guide-drive lugs. Only the two track suspension systems propel and steer the compact track loader, and vibration level is decreased up to 3 dB, 5 dB, or even 7 dB.

Control system for equipment on a vehicle with a hybrid-electric powertrain and an electronically controlled combination valve

A control system for a hydraulic system comprises an electronic control module, an electronic system controller, a remote power module, and a solenoid valve. The electronic control module monitors torque output of an internal combustion engine, an electric motor and generator. The electronic system controller monitors torque demand of a first and a second hydraulic circuit. The remote power module is in electrical communication with the electronic system controller. The solenoid valve is in electrical communication with the remote power module. The solenoid valve connects to a combination valve and has a first open position and a closed position. The combination valve is in fluid communication with a first hydraulic circuit and a second hydraulic circuit. The solenoid valve moves to the open position in response to an output signal from the electronic system controller.

Systems and methods for generating operational machine heading

A material moving machine includes a chassis, a dual-sensor position sensor system including a master and a slave, and a controller. The master and the slave are each configured to generate independent position signals representing a machine position. The controller is programmed to determine whether the machine is tramming, determine whether the master and the slave are operational, determine a center of rotation (COR) of the chassis when the machine is not tramming, and determine heading(s) based on a pair selected from the COR, an operational master, and an operational slave. The controller is further programmed to determine a prioritized heading based on at least one of the operational master and the operational slave and based on an order of priority that ranks the heading(s), use the prioritized heading to generate the machine heading when the machine is not tramming, and operate the machine based on the machine heading.

HYDRAULIC ARRANGEMENT

The invention relates to a method (100) of operating an actuator arrangement including at least two types of actuators (6, 7, 11, 12, 30, 34) effectuating different types of movement of a connected device (10, 32) to be actuated, where a change of attitude of the connected device (10, 32) has an influence on the position of at least a defined part (13, 14) of the connected device (10, 32). Different types of actuators (6, 7, 11, 12, 30, 34) are actuated in an automated way to at least partly compensate for the change of position of the defined part (13, 14) of the connected device (10, 32) when changing the attitude of the connected device (10, 32), at least for a certain range of movements.

METERING HYDRAULIC CONTROL SYSTEM FOR MINING MACHINE

A hydraulic system arranged to control at least two hydraulic actuators via a metering control valve assembly. The hydraulic system is advantageous to control a pivoting arm of an undercutting mining machine according to at least two modes of operation including an idling mode and a cutting mode. In particular, the hydraulic actuators may be controlled by quantitative variation of fluid flow speed and pressure.

HYDRAULIC DRIVE SYSTEM

A hydraulic drive system includes a hydraulic pump, a boom-dedicated control valve, a turning-dedicated control valve, a boom-dedicated operation unit, a turning-dedicated operation unit, and a driving control unit. If an operating amount of the turning-dedicated operating portion where a concurrent operation is performed and a single operation is performed are the same, the driving control unit adjusts a turning driving command, that an opening area between the hydraulic pump and a turning motor where the concurrent operation is performed is less than the opening area between the hydraulic pump and the turning motor where the single operation is performed, the concurrent operation wherein the turning operation command is outputted from the turning-dedicated operation unit and a boom operation command is outputted from the boom-dedicated operation unit, the single operation wherein the turning operation command is outputted, but the boom operation command is not outputted from the boom-dedicated ...

Working machine with a speed control arrangement

A working machine includes a traveling device to change a traveling speed in accordance with a flow rate of an operation fluid, a traveling operation device to change the flow rate of the operation fluid to be supplied to the traveling device, and a switching operation portion to change, at multiple steps, a supply amount of the operation fluid to be supplied to the traveling device, the supply amount corresponding to an operation extent of the traveling operation device.

CONSTRUCTION MACHINE

A construction machine includes a condenser 24 for cooling refrigerant for an air conditioner; a fan 21 for cooling the condenser 24 by using forward cooling air produced during normal-rotation drive; other cooled objects such as a radiator 25 and the like disposed under the lee of the forward cooling air with respect to the condenser 24; a refrigerant pressure detector 27 for detecting the pressure of the refrigerant flowing in the condenser 24; and a controller 136 for executing reverse-rotation stop processing for returning the fan 21 to the normal-rotation drive when the pressure P of the air conditioner refrigerant detected by the refrigerant pressure detector 27 reaches a preset normal-rotation return pressure P1 during reverse-rotation drive of the fan 21. Thus, the lowering of the cooling effect of an air conditioner can be suppressed while reducing the burden of cleaning an engine room.

WORK VEHICLE

HYDRAULIC CONTROL DEVICE FOR WORK MACHINE

Disclosed is a hydraulic control apparatus (20) capable of appropriately judging the propriety of a regenerative operation. The hydraulic control apparatus (20) includes a flow-path selector valve (70) that switches a supply flow path and a flow-path switching control unit that operates the same, a regeneration valve and a regeneration release valve (62) capable of the regenerative operation, and a regeneration control unit that operates the same. The flow-path switching control unit makes the flow-path selector valve (70) form a flow-path providing communication between first and second pumps (21, 22) in a combined work state. The regeneration control unit judges the propriety of the regenerative operation on the basis of the second pump pressure which is the discharge pressure of the second pump (22) in a single operation state and judges the propriety of the regenerative operation on the basis of whether or not the driving state of the work actuator (45) is within an allowable range ...

Hydraulic Drive Apparatus for Construction Equipment

A hydraulic drive system for a working machine provides improved safety during forced regeneration. Upon input of a forced regeneration command signal from a forced regeneration switch, a controller detects non-operated states of all hydraulic actuators such as an arm cylinder arranged on a hydraulic excavator based on a lock detection signal from a gate lock detection switch, and also an attitude of a front working mechanism. The attitude is proper from the standpoint of safety. The detection is based on an arm angle signal from an arm angle sensor, a bucket angle signal from a bucket angle sensor and a boom pressure signal from a boom pressure sensor. Taking the detection of the non-operated states and proper attitude as conditions, the controller outputs control signals to a boosting proportional solenoid valve and flow-rate controlling, proportional solenoid valve to make a forced regenerator conduct forced regeneration.

Система рулевого управления автогрейдером

Предложена система рулевого управления автогрейдером, оснащенная передними управляемыми колесами и шарнирно-сочлененной рамой (ШСР), рулевым колесом и рулевой колонкой, гидроцилиндрами поворота шарнирно-сочлененной рамы, гидроцилиндрами поворота передних колес и гидравлическим рулевым механизмом (ГРМ), соединенным с насосной станцией. К рулевой колонке подключен механизм синхронного поворота «М», к которому дополнительно подключается второй гидравлический рулевой механизм (ГРМ), вход которого соединен с насосной станцией, а выходы соединены с гидроцилиндрами поворота шарнирно-сочлененной рамы. Полезная модель относится к системам рулевого управления землеройно-транспортными машинами, точнее к автогрейдеру. Предложенная система рулевого управления автогрейдером позволяет осуществлять синхронный поворот передних управляемых колес и хребтовой рамы относительно моторной рамы с целью движения передних и задних колес автогрейдера по одной колее, что позволит повысить маневренность и мобильность автогрейдера. 1 ил. Ц 1 174238 ко РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) (11) зе а газа < (13) (51) МПК ВО2Е 3/85 (2006.01) ВО2Е 9/22 (2006.01) Вб2р 5/28 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (21)(22) Заявка: 2017118630, 29.05.2017 (24) Дата начала отсчета срока действия патента: 29.05.2017 Дата регистрации: 09.10.2017 Приоритет(ы): (22) Дата подачи заявки: 29.05.2017 (45) Опубликовано: 09.10.2017 Бюл. № 28 Адрес для переписки: 644050, г. Омск, пр. Мира, 11, ФГБОУ ВО "Омский государственный технический университет", Информационно-патентный отдел, Бабенко О.И. (72) Автор(ы): Ионова Юлия Евгеньевна (КО), Щербаков Виталий Сергеевич (КО) (73) Патентообладатель(и): Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный технический университет" (КП) (56) Список документов, цитированных в отчете о поиске: КО 146298 01, 10.10.2014. ЗЧ 1639994 АТ, 07.04.1991. 50 682616 АТ, 30.08.1979. ...

Exhaust gas cleaning system for engineering vehicle

An exhaust gas cleaning system is provided in an engineering vehicle such as a hydraulic excavator. During automatic regeneration, when a gate lock lever 5 is in a locked state and work is not performed, the exhaust gas temperature detected by the exhaust temperature detecting device 37 may be lower than the threshold value, so temperature-rising assistance is started as follows. The minimum engine output PS 1 (pump discharge pressure P 1 and pump discharge amount Q 1 ) is brought to engine output PS 2 (pump discharge pressure P 2 and pump discharge amount Q 2 ). In this way, a hydraulic load is applied to an engine to thereby increase exhaust gas temperature. When the work is resumed during the regeneration, an operator pulls down the gate lock lever to the first position A, and the engine output is returned to PS 1. Thus, the temperature-rising assistance is stopped, however the automatic regeneration is continued.

Hydraulic system for working machine

A pair of dozer control valves V 3, V 6 concurrently operable; a pilot pressure valve V 14 switchable between an independent position 27 where, when only track devices 5 are operated, discharged fluid from one hydraulic-fluid discharge port P 1 is independently supplied to one track control valve and one dozer control valve, and discharged fluid from the other hydraulic-fluid discharge port P 2 is independently supplied to the other track control valve and the other dozer control valve, and a merging position 28 where, when the other control valves are operated, discharged fluid from the one hydraulic-fluid discharge port and from the other hydraulic-fluid discharge port are merged and supplied to the control valves V 1 to 10; and pressure compensation valves V 11 in the control valves and for distributing hydraulic fluid at flow rates based on extent of actuation of the other control valves operated, irrespective of the magnitude of the loads.

Work machine and control method for work machines

In a work machine, a control unit controls a pilot control valve for controlling the opening area of a first direction switch valve in executing the combined operation to be less than or equal to that in executing a single operation. The combined operation represents an operation of simultaneously operating first and second actuators. The single operation represents an operation of operating only the first actuator. Further, the control unit determines the opening area of the first direction switch valve in the combined operation based on a hydraulic pressure detected by a hydraulic pressure detector unit.

Motor Control Device for Working Vehicle

A motor control device for a working vehicle includes: a travel drive device that transmits rotation of a motor to wheels through a torque converter; a first selection device to be operated so as to select one of a power mode and an economy mode; a second selection device that is different from the first selection device; a mode switching device that switches from the economy mode to the power mode if the second selection device is operated in a state where the economy mode has been selected by the first selection device; and a speed restriction device that, when the economy mode is set, restricts a maximum rotational speed of the motor to a lower speed side than that when the power mode is set.

Control system for work vehicle

A work machine includes a fluid circuit for use with an attachment configured to operate using one of a uni-directional flow and a bi-directional flow through the attachment. An operator-enabled mode selection switch operably connects to a controller. An electrical circuit includes the operator-enabled mode selection switch and a second operator-enabled switch. A first control valve is in fluid communication with the attachment. In response to the mode selection switch being operator-actuated to a bi-directional mode setting, the first control valve via the controller is actuatable to one of the bi-directional positions, electrical power being unavailable to the second operator-enabled switch of the electrical circuit. In response to the mode selection switch being operator-actuated to a uni-directional mode setting, the first control valve via the controller secures the first control valve in the uni-directional position, and electrical power is provided to the second operator-enabled switch of the electrical circuit

Hybrid working machine and controlling method thereof

In a hybrid working machine, a control unit ( 60 ) corrects an output upper limit value of an engine ( 50 ) based on a deviation between a target revolution speed of the engine and an actual revolution speed of the engine, and output values of a motor generator ( 12 ), a hydraulically driven unit ( 54 ) and an electrically driven unit ( 56 ) are determined based on the corrected output upper limit value of the engine, or the control unit ( 60 ) corrects an output lower limit value of the motor generator ( 12 ) based on a deviation between the target revolution speed of the engine and the actual revolution speed of the engine, and the output values of the motor generator ( 12 ), the hydraulically driven unit ( 54 ) and the electrically driven unit ( 56 ) are determined based on the corrected output lower limit value of the motor generator ( 12 ).

Implement attachment having a hydraulically controlled locking function

An implement attachment for a working machine. The implement attachment comprises lock plungers having a hydraulic actuator. The lock plungers are arranged for locking co-operation with an implement. Hydraulic medium supply means is arranged for supply of hydraulic medium to the actuator. The hydraulic supply means is provided with a measuring device arranged to measure the volume of hydraulic medium that is supplied to the actuator. A working machine provided with the implement attachment and use of the implement attachment are included.

Hydraulic system having dual tilt blade control

A hydraulic system for a machine is disclosed. The hydraulic system may have a tank configured to hold a supply of fluid, a pump configured to draw fluid from the tank and pressurize the fluid, a first cylinder operatively connected between a first side of a work tool and an undercarriage of the machine, and a second cylinder operatively connected between a second side of the work tool and the undercarriage of the machine. The hydraulic system may also have a first electro-hydraulic valve associated with the first cylinder and configured to selectively regulate a flow of pressurized fluid to the first cylinder independently of the second cylinder, and a second electro-hydraulic valve associated with the second cylinder and configured to selectively regulate a flow of pressurized fluid to the second cylinder independently of the first cylinder.

Hydraulic control system having cylinder stall strategy

A hydraulic control system for a machine is disclosed. The hydraulic control system may have a hydraulic circuit, and a pump configured to supply pressurized fluid to the hydraulic circuit. The hydraulic control system may also have a first fluid actuator fluidly connected to receive pressurized fluid from the hydraulic circuit, a first valve arrangement movable to control a flow of fluid to the first fluid actuator, a second fluid actuator fluidly connected to receive pressurized fluid from the hydraulic circuit, and a second valve arrangement movable to control a flow of fluid to the second fluid actuator. The hydraulic control system may additionally have a controller in communication with the first and second valve arrangements. the controller may be configured to make a determination of a stall condition of the first fluid actuator, and to selectively change a flow command directed to the second valve arrangement based on the determination.

Charge bypass system for engine start

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.

Control system for hybrid construction machine

A regeneration switching valve which communicates with a neutral flow path and a tank at a normal position and cuts off communication between the neutral flow path and the tank to cause the neutral flow path to communicate with a hydraulic motor for power generation at a switched position is provided in at least one of first and second circuit systems including a plurality of control valves.

Control system for hybrid construction machine

A controller determines whether or not the storage amount of a battery is below a threshold, and reduces an assist output of a sub-pump by controlling an assist control mechanism based on an assist correction coefficient, increases the discharge amount of a main pump by controlling an engine controller based on an engine rotation speed correction coefficient and increasing the rotation speed of an engine, and increases an output of the main pump by increasing the rotation speed of the engine by as much as a reduction in the assist output of the sub-pump.

Construction equipment machine with improved boom suspension

A construction equipment machine of the loader type is provided and has at least a chassis, a traction arrangement and a loader arrangement. The loader arrangement includes a loader boom structure which is controlled through a two way boom hydraulic cylinder system, and a boom suspension system through which a lift-side of the boom cylinder system may be connected to a hydraulic pressurized accumulator while the drop-side of the boom cylinder system is connected to a tank return line. The tank return line has a flow limiter for limiting the flow of hydraulic oil in the direction from the drop-side of the boom cylinder system to the tank.

Hydraulic System for Construction Machinery

The present disclosure relates to a hydraulic system for construction machinery, which is applied to construction machinery provided with a steering unit for controlling steering of equipment, and a main control valve for controlling operating of a work tool, and includes: a main pump for discharging working fluid supplied to the steering unit and the main control valve; a load sensing pressure sensor for sensing a load sensing pressure of the steering unit; a priority valve installed in a supply passage for the working fluid discharged from the main pump, for dividing and supplying the working fluid discharged from the main pump to the steering unit and the main control valve, to correspond to the load sensing pressure; an auxiliary pump for supplementing working fluid to the supply passage supplying the working fluid divided by the priority valve to the steering unit; an electric motor for operating the auxiliary pump; and a controller for operating the electric motor when the load sensing pressure is greater than a reference load sensing pressure, and additionally supplying working fluid discharged from the auxiliary pump the steering unit.

Meterless hydraulic system having load-holding bypass

A hydraulic system is disclosed. The hydraulic system may have a pump, a hydraulic actuator, and first and second passages fluidly connecting the pump to the hydraulic actuator in a closed-loop. The hydraulic system may also have a control valve, and a load-holding valve configured to selectively lock movement of the hydraulic actuator. The load-holding valve may include a valve block at least partially defining a pump passage, an actuator passage, a control passage, a restricted passage connecting the actuator passage and the control passage, and a bypass passage connecting the actuator passage and the control passage. The load-holding valve may also include a valve element movable between a first position at which flow between the pump and the hydraulic actuator is blocked, and a second position at which fluid is allowed to flow between the pump and the hydraulic actuator, the valve element being spring-biased toward the first position.

Method and apparatus for recovering inertial energy

A hydraulic system adapted to recover inertial energy is disclosed. The hydraulic system includes a pump, a variable displacement pump/motor having an input/output shaft, an accumulator, and a valve arrangement. The valve arrangement is operable in: a) a first mode where the variable displacement pump/motor is driven by the pump to rotate the input/output shaft and the load; b) a second mode where the variable displacement pump/motor uses inertial energy from a deceleration of the load to charge the accumulator; and c) a third mode where the variable displacement pump/motor is driven by the accumulator to rotate the input/output shaft and the load. The hydraulic system also includes a controller for controlling operation of the pump, the variable displacement pump/motor and the valve arrangement.

Digital hydraulic system

A digital hydraulic system including a fluid having three portions each at a pressure and a digital hydraulic transformer having a first and second element. The first element has a first end and a second end. The first and second elements operating along a common axis, and together defining at least four variable volume working chambers. The at least two of the at least four variable volume working chambers containing fluid directing force on the second element in a direction toward the first end. Another two of the at least four variable volume working chambers containing fluid directing force on the second element toward the second end. A control system individually selectively fluidically connects and disconnects each of the four variable volume working chambers to and from the three portions of the fluid at the three pressures.

Work machine safety device

Disclosed is a safety system for a working machine, which allows an operator to instantaneously, readily and precisely recognize current stability during work including operations of a front working mechanism and swing operations. In a safety system for a working machine, a controller is provided with a ZMP calculating means ( 60 f ) for calculating coordinates of a ZMP by using position information, acceleration information and external force information on respective movable portions of a main body, which includes a front working mechanism, and undercarriage, and a stability computing means ( 60 d ) for calculating a support polygon formed by plural ground contact points of the working machine with a ground, and, when the ZMP is included in a warning region formed inside a perimeter of the support polygon, producing a tipping warning; the safety system is provided with a display ( 61 d ) for displaying a top plan view of the working machine and a ZMP position of the working machine relative to the support polygon; the ZMP calculating means and stability computing means compute and display the ZMP position and the support polygon including the warning region therein; and the safety system produces a tipping warning when the calculated ZMP position is included in the warning region formed inside the perimeter of the support polygon.

ELECTRICAL CONSTRUCTION MACHINE

A hydraulic pump, electric motor, inverter, oil tank, heat exchanger, and battery are mounted on a revolving frame, and are covered by an exterior cover. The revolving frame is provided with a partition plate, and the interior of the exterior cover is partitioned by the partition plate into a machine room for accommodating the hydraulic pump and the electric motor and into a battery room for accommodating the battery. A cooling fan is arranged in the machine room so that outside air is introduced into the machine room through an oil tank cooling air inlet port and an inverter cooling air inlet port which are provided in the exterior cover. This outside air cools the hydraulic pump, the electric motor, and the oil tank in the machine room and is exhausted to the outside of the machine room through an exhaust port. 1. An electrical construction machine including: a vehicle body frame which constitutes a support structure of a vehicle body and which has a working mechanism mounted on a front side in a front-rear direction; an operator's seat provided on said vehicle body frame on a left side in a left-right direction; a hydraulic pump provided on a right side of said operator's seat to supply hydraulic oil to said working mechanism; an electric motor for driving said hydraulic pump; an inverter for controlling a drive voltage of said electric motor; an oil tank for storing the hydraulic oil which is supplied to said working mechanism; a heat exchanger for cooling a heated fluid; a battery provided on a rear side of said operator's seat to effect the feeding of electric power to said electric motor; and an exterior cover provided in such a manner as to cover said hydraulic pump , said electric motor , said inverter , said oil tank , said heat exchanger , and said battery , characterized in that:said vehicle body frame is provided with a partition plate for partitioning an interior of said exterior cover into a machine room for accommodating said hydraulic pump, said ...

Hybrid Wheel Loader

A hybrid wheel loader includes: an engine that includes an output shaft; a motor/generator that includes a rotating shaft directly attached to the output shaft of the engine; a transmission that includes an input shaft attached to the rotating shaft of the motor/generator, and an output shaft; a propeller shaft disposed on an output side of the transmission and driven via the output shaft of the transmission; an electricity storage device; and a control device that stores electricity into the electricity storage device by collecting electrical energy at the motor/generator.

Control Device for an Electric Actuator

A control device of an electric actuator adapted to perform a forward-reverse movement includes a control unit adapted to be operated in a forward direction or a reverse direction in accordance with the forward-reverse movement of the electric actuator. It also includes a pilot circuit, which is connected to the control unit and which generates a forward pilot pressure or a reverse pilot pressure in accordance with the forward operation or the reverse operation of the control unit. The control device has a differential pressure acquiring unit that acquires a differential pressure between a pilot pressure corresponding to an operation direction of the control unit and a pilot pressure, in a direction opposite to the operation direction, and it has a control command generator that generates a control command for controlling the electric actuator based on the differential pressure acquired by the differential pressure acquiring unit. The control device includes a drive controller for controlling a drive of the electric actuator based on the generated control command.

Closed-loop hydraulic system having energy recovery

A hydraulic system is disclosed. The hydraulic system may have a pump with variable-displacement, a first linear actuator, and a second linear actuator coupled to the first linear actuator to operate in tandem. The first and second linear actuators may be connected to the pump in closed-loop manner, and each of the first and second linear actuators may have a first chamber and a second chamber separated by a piston. The hydraulic system may also have an accumulator in fluid communication with the second chamber of only the second linear actuator.

Meterless hydraulic system having multi-actuator circuit

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

Docking Station

A hydraulically-operated implement has a hydraulic system with a hose and a coupler connecting the hose to a mating port on a tractor. A docking station is mounted on the implement receives the coupler on the free end of the hose when disconnected from the tractor. The docking station includes a station body having a coupler receiving portion and a leakage collection portion. The coupler receiving portion has a primary side with at least one circular bore and the leakage collection portion contains a drain opening. A retention device positioned on the inner periphery of each of the circular bores receives the coupler. The drain opening is sealed with a drain plug and the docking station has an inside bulkhead parallel with the primary side of the station body. The bulkhead has a circular hole formed therein aligned with the at least one cylindrical bore in the primary side.

Meterless hydraulic system having multi-circuit recuperation

A hydraulic system is disclosed. The hydraulic system may have a first meterless circuit with a first pump fluidly connected to a first actuator in a closed-loop manner, and a second meterless circuit with a second pump fluidly connected to a second actuator in a closed-loop manner. The hydraulic system may also have at least one accumulator configured to receive pressured fluid from and discharge pressurized fluid to the first and second meterless circuits.

Closed-Loop Hydraulic System Having Flow Combining and Recuperation

A hydraulic system is disclosed. The hydraulic system may have a plurality of closed-loop circuits fluidly connecting a plurality of pumps to a plurality of actuators, and at least one control valve configured to selectively fluidly connect a first of the plurality of closed-loop circuits to a second of the plurality of closed loop circuits. The hydraulic system may also have an accumulator configured to receive pressured fluid from and discharge pressurized fluid to at least the first of the plurality of closed-loop circuits.

Flow control system for a hydraulic pump of construction machinery

A flow control system of a hydraulic pump for a construction machine is provided, which can variably control a discharge flow rate of the hydraulic pump in accordance with load pressure generated by a hydraulic actuator such as a boom cylinder. According to the flow control system of a hydraulic pump, the discharge pressure of the hydraulic pump and the operation rate of the operation lever for the hydraulic actuators is detected, and standard load pressures of the respective hydraulic actuators are set. If the discharge pressure of the hydraulic pump is higher than the preset standard load pressures of the hydraulic actuators, the discharge flow rate of the hydraulic pump is proportionally reduced for the same operation rate in accordance with degrees of loads generated by the hydraulic actuators, while if the discharge pressure of the hydraulic pump is lower than the standard load pressures of the hydraulic actuators, the discharge flow rate of the hydraulic pump is controlled in proportion to the operation rate.

Torque output control for swing pump

A hydraulic circuit including a hydraulic swing motor having a first port and a second port. A first motor conduit connected to the first port of the hydraulic swing motor, and a second motor conduit connected to the second port of the hydraulic swing motor. The hydraulic circuit further includes a pump to selectively supply a flow of pressurized hydraulic fluid to the hydraulic swing motor through the first and the second motor conduits. A controller electrically connected to the pump adjusts a torque output of the pump based on a swing speed of the hydraulic swing motor.

Hydraulic excavator

A hydraulic excavator includes a lower travel body, an upper swivel buds, a harness and a bracket. The harness is drawn out from an interior of a cab, disposed between the cab and a center frame, and connected to electrical components. The bracket is secured to the cab and supports the harness along a side surface of the cab. The harness is supported about a periphery of the bracket, and has a first, portion downwardly drawn out from a bottom surface of the cab, a second portion extending more outward than the side surface of the cab and forward from the first portion along the bottom surface of the cab, a third portion extending upward from the second portion along the side surface of the cab, and a fourth portion extending toward a rear part of the hydraulic excavator from the third portion along the side surface of the cab.

Continuously variable transmission and a working machine including a continuously variable transmission

A continuously variable transmission includes a variator unit having a variator input shaft and a variator output shaft, and first, second and third planetary gear sets. The first and second planetary gear sets are arranged together and each includes a first member operatively connected to a common transmission input shaft and a second member operatively connected to a common output shaft, each of the first and second planetary gear sets further including a third member. The third planetary gear set has a first, second and third member. The variator input shaft is operatively connected to the third member of the second planetary gear set and the variator output shaft is operatively connected to the third member of the first planetary gear set. The first member of the third planetary gear set is operatively connected to the variator output shaft. The second member of the third planetary gear set is selectively connectable to the third member of the second planetary gear set and selectively connectable to the transmission housing. The third member of the third planetary gear set is operatively connected to a transmission output shaft. The common output shaft is selectively connectable to the transmission output shaft.

HYDRAULIC CONTROL DEVICE FOR WORKING VEHICLE

A boom control valve and a pulsation absorption control valve are provided in the halfway point of a center bypass line. The pulsation absorption control valve is arranged in a position downstream of the boom control valve. The pulsation absorption control valve is switched to a blockade position and a communication position by a pilot pressure from a remote control valve. The pulsation absorption control valve is constituted such that one main line out of a pair of main lines is communicated with or blocked off from an accumulator via one communication line and the other main line is communicated with or blocked off from the side of a tank via the other communication line. The accumulator is operated as a dynamic damper at the traveling of a vehicle. This arrangement enables the construction of the communication line to be simplified, thus improving operability at assembling. 1. A hydraulic control device for a working vehicle comprising:a hydraulic pump constituting a hydraulic source for said working vehicle together with a tank;at least one or more hydraulic actuators driven by pressurized oil discharged from said hydraulic pump;a directional control valve for controlling switching of the pressurized oil to be supplied to said hydraulic actuator from said hydraulic pump;a pair of main lines for establishing connection between said directional control valve and said hydraulic actuator;an accumulator connected via one communication line branched from one main line out of said pair of said main lines to said hydraulic actuator to absorb pressure pulsations generated in said hydraulic actuator; anda pulsation absorption control valve provided in the halfway point of said one communication line to establish or block communication between said hydraulic actuator and said accumulator,wherein said directional control valve is arranged in the halfway point of a center bypass line for connecting said hydraulic pump to said tank to control switching of said pair of said ...

CONSTRUCTION MACHINE

A construction machine includes an engine, a hydraulic pump driven by drive force of the engine, a generator motor, and a dipstick tube. The generator motor is disposed between the engine and the hydraulic pump. The generator motor has a rotary shaft connected to an input shaft of the hydraulic pump and to an output shaft of the engine and an oil pan disposed in a lower part of a holding space formed inside a housing. The dipstick tube has a connector provided at a location that communicates with the oil pan of the generator motor, and a dipstick opening disposed above the generator motor, for checking a level of oil in the oil pan. 1. A construction machine comprising:an engine;a hydraulic pump driven by drive force of the engine;a generator motor disposed between the engine and the hydraulic pump and having a rotary shaft connected to an input shaft of the hydraulic pump and to an output shaft of the engine, and an oil pan disposed in a lower part of a holding space formed inside a housing; anda dipstick tube having a connector provided at a location that communicates with the oil pan of the generator motor, and a dipstick opening disposed above the generator motor, for checking a level of oil in the oil pan.2. The construction machine according to claim 1 , further comprisingan engine hood configured and arranged to be opened and closed, and covering an upper space in an engine compartment that houses the engine, the hydraulic pump, and the generator motor, whereinthe dipstick opening of the dipstick tube is provided in a space that is exposed when the engine hood is opened.3. The construction machine according to claim 1 , further comprisingan engine dipstick tube for checking an oil level of the engine,wherein the dipstick opening of the dipstick tube is provided on the same side as an dipstick opening of the engine dipstick tube.4. The construction machine according to claim 1 , whereinthe housing includes a first housing fixed on an engine side, and a second ...

CONTROL APPARATUS OF WORKING VEHICLE AND CONTROL METHOD THEREOF

A control apparatus of a working vehicle including a hydraulic pump driven by an engine and two hydraulic motors connected in parallel to the hydraulic pump, a clutch being released or engaged so that a power is transmitted to one of the hydraulic motors via the clutch, includes: a load detection unit determining a load of the working vehicle from a throttle output amount and an engine speed of the engine; and a control unit reducing a pump injection amount of the hydraulic pump under an upper limit injection amount of the hydraulic pump predetermined based on the load at a time of release shift control of the clutch and increasing a pump injection amount of the hydraulic pump under a lower limit injection amount of the hydraulic pump predetermined based on the load at a time of engagement shift control of the clutch. 1. A control apparatus of a working vehicle comprising a hydraulic circuit which is a closed circuit having a hydraulic pump driven by an engine and two hydraulic motors and in which the two hydraulic motors are connected in parallel to the hydraulic pump , a clutch being released or engaged so that a power is transmitted to an output shaft of one of the hydraulic motors via the clutch in the working vehicle , the working vehicle traveling by a drive force of the one or two hydraulic motors , the control apparatus comprising:a load detection unit configured to determine a working vehicle load of the working vehicle from a throttle output amount and an engine speed of the engine; anda control unit configured to execute control for reducing a pump injection amount of the hydraulic pump under a restriction of an upper limit injection amount of the hydraulic pump predetermined based on the working vehicle load determined by the load detection unit at a time of release shift control of the clutch and execute control for increasing a pump injection amount of the hydraulic pump under a restriction of a lower limit injection amount of the hydraulic pump ...

HYDRAULIC DRIVE SYSTEM FOR HYDRAULIC WORKING MACHINE

A hydraulic drive system designed so that while maintaining intact a structure of a relief valve having a shockless function, the drive unit hydraulic drive system facilitates changing a driving pressure or braking pressure of a hydraulic swing motor and hence, changing a maximum driving torque or braking torque of the hydraulic swing motor. Inside a swing motor unit is arranged a first swinging relief valve provided with a shockless function to limit a driving pressure or braking pressure of the hydraulic swing motor in order to prevent the pressure from exceeding a first setting pressure. Also, a second swinging relief valve is provided for limiting the driving pressure or braking pressure of the hydraulic swing motor in order to prevent the pressure from exceeding a second setting pressure that is lower than the first setting pressure. 1. A hydraulic drive system for a hydraulic working machine equipped with a swing structure and a working implement , the hydraulic drive system comprising:a hydraulic pump;a swing motor unit driven by a hydraulic fluid delivered from the hydraulic pump, the motor unit including a hydraulic swing motor for rotating the swing structure;a control valve including a swing-directional control valve, the control valve controlling flow of the hydraulic fluid supplied from the hydraulic pump to the hydraulic swing motor;{'b': '1', 'a first swinging relief valve with a shockless function, disposed inside the swing motor unit, for limiting a driving pressure or braking pressure of the hydraulic swing motor in order to prevent the pressure from exceeding a first setting pressure (P);'}{'b': 2', '1, 'a second swinging relief valve for limiting the driving pressure or braking pressure of the hydraulic swing motor in order to prevent the pressure from exceeding a second setting pressure (P) that is lower than the first setting pressure (P); and'}a selector for selecting either one of a first relief mode and a second relief mode, the first relief ...

Hydraulic system and hydraulic distributor for the actuating working machines

Hydraulic system for actuating the hydraulic actuators of a working machine, the hydraulic system has a delivery, a discharge, a drainage line, a signal line, a main slide valve which actuates a corresponding hydraulic actuator, a safety slide valve integral with the main slide valve and adapted for opening or closing the drainage line itself, and a pressure compensator presenting a frontal chamber connectable by way of the main slide valve to the delivery and a rear chamber connected to the signal line; the drainage line connecting a node of the signal line to the discharge.

BACKHOE LOADER

A backhoe loader includes: a transmission; a cab including an operator's seat allowed to be forwardly and backwardly oriented; a loader disposed forwards of the cab; a backhoe disposed rearwards of the cab; a hydraulic pump configured to supply an operating oil to a hydraulic clutch; a hydraulic circuit including a relief valve for setting an intra-circuit hydraulic pressure to be a first hydraulic pressure; a work mode determining unit configured to determine whether or not an operating mode is a backhoe work mode using the backhoe; and a relief valve controlling unit. The relief valve controlling unit is configured to control a relief pressure of the relief valve at a second hydraulic pressure lower than the first hydraulic pressure when the work mode determining unit determines that the operating mode is the backhoe work mode. 1. A backhoe loader comprising;a transmission including at least a hydraulic clutch;a cab including an operator's seat allowed to be set in two positions of a forwardly oriented position and a backwardly orientated position;a loader disposed forwards of the cab;a backhoe disposed rearwards of the cab;a hydraulic pump configured to supply an operating oil to the hydraulic clutch;a hydraulic circuit including a relief valve configured to set an intra-circuit hydraulic pressure to be a first hydraulic pressure, the hydraulic circuit being configured to supply the operating oil from the hydraulic pump to the hydraulic clutch;a work mode determining unit configured to determine whether or not an operating mode is a backhoe work mode using the backhoe; anda relief valve controlling unit configured to control a relief pressure of the relief valve at a second hydraulic pressure lower than the first hydraulic pressure when the work mode determining unit determines that the operating mode is the backhoe work mode.2. The backhoe loader recited in claim 1 , further comprisingan operator's seat orientation detecting sensor configured to detect an ...

DEVICE FOR CONTROLLING CONSTRUCTION EQUIPMENT

Provided is a device for controlling construction equipment for controlling the spool of an MCV, which is directionally controllable, to control working fluid which is supplied to a hydraulic actuator. According to the present invention, provided is a device for controlling construction equipment, comprising: a remote control valve for outputting a secondary signal pressure which is proportionate to the amount calibrated by an operator; a calibrated amount detection means for detecting the secondary signal pressure of the remote control valve; an electro proportional pressure reducing valve for outputting the secondary signal pressure; first and second shuttle valves, each of the shuttle valves having an input portion on one side which connects to the secondary signal pressure of the remote control valve, and an input portion on the other side to which output-side ports of the electro proportional pressure reducing valve connect respectively; a directional control spool for controlling the actuation of the hydraulic actuator when exchanging by means of the signal pressure output from the first and second shuttle valves; and a controller for outputting a control signal to the electro proportional pressure reducing valve so as to correspond to the operation amount which is input by the operation amount detection means. 1. A control apparatus for a construction machine including an engine , a hydraulic pump connected to the engine , and a hydraulic actuator configured to receive a supply of hydraulic fluid from the hydraulic pump and configured to be capable of being directionally operated to drive a work apparatus , the control apparatus comprising:a remote control valve configured to output a secondary signal pressure in proportion to an operator's manipulation amount;a manipulation amount detection means configured to detect the secondary signal pressure outputted from the output sides of the remote control valve;an electro proportional pressure reducing valve ...

HYBRID SYSTEM FOR CONSTRUCTION MACHINE

When the actuator drive torque of a hydraulic pump is lower than a switching torque τ0, a controller closes a solenoid switching valve and makes a rotary electric machine function as a generator. With the increase in the actuator drive torque, the controller controls a pressure compensated flow control valve so that the flow rate of hydraulic fluid supplied from the hydraulic pump to a rotary hydraulic device decreases. When the actuator drive torque is higher than the switching torque, the controller opens the solenoid switching valve, makes the rotary electric machine function as an electric motor, and controls the pressure compensated flow control valve so that the hydraulic fluid discharged by the hydraulic pump is not supplied to the rotary hydraulic device. Consequently, shocks due to flow rate fluctuation are prevented when operational states of the rotary hydraulic device and the rotary electric machine are switched. 1. A hybrid system for a construction machine , comprising:an engine;a main hydraulic pump which is driven by the engine;a plurality of actuators;a control valve which is connected to the main hydraulic pump via a first hydraulic fluid supply line for controlling the flow of hydraulic fluid supplied to the actuators;a rotary electric machine which has functions of both an electric motor and a generator;a rotary hydraulic device which is connected to the rotary electric machine, driven by the rotary electric machine and functions as a hydraulic pump when the rotary electric machine functions as an electric motor, and functions as a hydraulic motor and drives the rotary electric machine when the rotary electric machine functions as a generator;a second hydraulic fluid supply line which connects the rotary hydraulic device to the first hydraulic fluid supply line;an electricity storage device; anda bidirectional converter which is connected between the electricity storage device and the rotary electric machine for controlling the transfer of ...

Working Vehicle Travel Control Apparatus

A working vehicle travel control apparatus, comprising: a variable displacement hydraulic pump; a variable displacement hydraulic motor connected in a closed circuit to the hydraulic pump and driven upon pressure oil from the hydraulic pump; a first control unit controls a motor displacement angle of the hydraulic motor by an electrical signal; a constant mesh transmission includes a clutch device that includes a High clutch section transmits power at a first transmission gear ratio and a Low clutch section that transmits power at a second transmission gear ratio, which is greater than the first transmission gear ratio, the constant mesh transmission transmits or interrupts power from the hydraulic motor; and a second control unit controls the first control unit so as to reduce the motor displacement angle to a predetermined value when the transmission is switched from the first transmission gear ratio to the second transmission gear ratio. 1. A working vehicle travel control apparatus , comprising:a variable displacement hydraulic pump that is driven by an engine;a variable displacement hydraulic motor that is connected in a closed circuit to the hydraulic pump and driven upon pressure oil from the hydraulic pump;a first control unit that controls a motor displacement angle of the hydraulic motor by an electrical signal;a constant mesh transmission that includes a clutch device that includes a High clutch section that transmits power at a first transmission gear ratio and a Low clutch section that transmits power at a second transmission gear ratio, which is greater than the first transmission gear ratio, the constant mesh transmission that transmits or interrupts power from the hydraulic motor; anda second control unit that controls the first control unit so as to reduce the motor displacement angle to a predetermined value when the transmission is switched from the first transmission gear ratio to the second transmission gear ratio.2. A working vehicle travel ...

QUICK COUPLER CIRCUIT FOR CONSTRUCTION EQUIPMENT

A switch () is configured so as to be operated with two positions of a locked position when an attachment is held and an unlocked position when an attachment is released. Furthermore, a control device () receives an operation signal that is output when the switch () is operated to the locked position or the unlocked position and switches and controls an electromagnetic switching valve () so that the pressure of a hydraulic pump begins to rise and so that, at a stage when a predetermined time has passed, the pressure raising in the hydraulic pump is stopped. 1a quick coupler cylinder that is subject to extension and retraction driving and holds/detaches the attachment to or from the working machine;a hydraulic pump;an electromagnetic switching valve that switches forced pressure raising of the hydraulic pump;a coupler switching valve for performing extension and retraction driving of the quick coupler cylinder by switching a supplying direction of hydraulic oil to the quick coupler cylinder; anda control device that switches and controls the electromagnetic switching valve and the coupler switching valve, respectively,wherein a switch for switching and operating the electromagnetic switching valve and the coupler switching valve is configured so as to be operated with two positions of a locked position where extending and retracting the quick coupler cylinder to hold the attachment, and an unlocked position where extending and retracting the quick coupler cylinder to detach the attachment, andthe control device switches and controls the coupler switching valve by receiving an operation signal that is output by operating the switch to the locked position or the unlocked position, and switches and controls the electromagnetic switching valve so that the pressure raising of the hydraulic pump begins by operation of the switch and the pressure raising of the hydraulic pump is stopped at a stage when a predetermined time elapses.. A quick coupler circuit for construction ...

CONSTRUCTION MACHINE

A construction machine includes: a work device; an operation device which receives a manipulation; a hydraulic unit including a hydraulic motor; an electric unit including an electric motor and an energy storage unit; a control device which makes the electric power of the energy storage unit assist the hydraulic unit upon the manipulation for the drive side, and makes the electric motor generate regenerative electric power unit upon the manipulation for the regeneration side; and a power-discharge command unit which issues a discharge command for the energy storage unit. Upon receiving the discharge command, the control device operates the electric motor to lower a voltage of the energy storage unit upon the manipulation for the drive side, and makes only the hydraulic unit decelerate or stop the work device upon the manipulation for the regeneration side. 1. A construction machine , comprising:a work device operable on a drive side and on a regeneration side;an operation device which receives a manipulation and outputs an operation command concerning the work device in accordance with the manipulation;a hydraulic unit which includes a hydraulic motor as a drive source and drives the work device based on the manipulation on the operation device;an electric unit which includes an electric motor as a drive source and an energy storage unit functioning as a power source for the electric motor, the electric unit being configured to assist driving of the work device by the hydraulic unit;a control device which operates the electric unit in such a manner that the electric motor assists the hydraulic unit by electric power from the energy storage unit when the operation device receives a manipulation for actuating the work device on the drive side and which operates the electric unit in such a manner that the electric motor generates regenerative electric power to supply the regenerative electric power to the energy storage unit as charging electric power when the ...

Hybrid construction machine

A hybrid construction machine has an electric motor for driving the swing structure, and the electric motor is prevented from becoming incapable of generating torque due to a low energy state or an overcharged state of an electricity storage device. A swing-mode selector switch 77 which is manually operated switches between a hydraulic/electric combined swing mode for driving the swing structure by driving both the electric motor and a hydraulic motor and a hydraulic solo swing mode for driving the swing structure by driving only the hydraulic motor. For a normal operation, the swing mode is initially set in the hydraulic/electric combined swing mode. For a specific operation, the operator switches the swing-mode selector switch from a hydraulic/electric combined swing position to a hydraulic solo swing position.

Electro-hydraulic drive system for a work machine

An electro-hydraulic drive system for a work machine which drives an upper rotary body by controlling a flow rate of a hydraulic fluid by a control valve, includes an electro-hydraulic pump including a hydraulic pump driven by an engine, and a first electric motor, and an electro-hydraulic motor including a hydraulic motor rotated by the hydraulic oil supplied from the electro-hydraulic pump, and a second electric motor, and a controller which determines an operating state of the first electric motor and an operating state of the second electric motor based on a load of the electro-hydraulic pump and a load of the electro-hydraulic motor, and is able to perform an efficient operation by using a hydraulic pressure (fluid pressure) and electric power.

Electronic load drop protection for hydraulic fluid system

A method of controlling a valve includes detecting a supply pressure at a fluid source and detecting a first port pressure at a first side of a piston. A controller actuates the valve from a closed position to a first open position when the supply pressure is in excess of the first port pressure. Thereafter, the controller actuates the valve to the closed position when the supply pressure is less than the first port pressure.

Method for obtaining a full range of lift speeds using a single input

A method for operating a work attachment of a work machine with a single input is disclosed. In one step of the method, an indication is received that operation of a work circuit in a hydraulic system is to be activated. Upon this indication, the hydraulic system may be placed in a work circuit primary mode in which a pump is placed in fluid communication with the work circuit. The method also includes receiving a lifting lever position and correlating the lifting lever position to a required lifting speed. The method further includes automatically controlling at least two of an engine speed, a pump displacement, and a lifting control valve to satisfy the required lifting speed. Additionally, the operation of the engine speed, pump displacement and lifting control valve may be sequentially staged in pre-defined zones of operation.

Electrically-operated construction machine

An electrically-operated construction machine with a battery charging operation. A lock switch provides a closed contact when a lock lever in a cab is placed in an unlock position. A feed port is disposed outside the cab to accept a cable from a commercial power source. The feed port is provided with a charge start switch . A control device has a motor control function for driving an electric motor with electrical power of a main battery when a signal is input from the lock switch. A charge control function is for charging the main battery with electrical power of the commercial power source when dictated by the charge start switch. The lock switch is wire-connected so as not to output the signal to the control device even if the closed contact is provided by the lock switch when the control device exercises charge control.

Coupling arrangement

A coupling arrangement for fluid coupling a worktool to a machine comprising at least one coupler assembly slideably mounted in a cavity for coupling a machine fluid circuit and a work tool fluid circuit, the coupler assembly partitioning the cavity to form a chamber; a diversion path connecting the machine fluid circuit to the chamber; and a check valve positioned in the diversion path for flow of fluid from the machine fluid circuit to the chamber to generate a force on the coupler assembly for maintaining the fluid coupling.

Ball joint for pipe connection, and pipe connection

A ball joint ( 1 ) for a pipe connection includes shell parts ( 3, 4 ) surrounding one another in a sealing manner, which each define a respective longitudinal centre line and which are rotatable in relation to one another between an aligned position, in which the longitudinal centre lines coincide, and a rotated position, in which the longitudinal centre lines form an angle with one another which differs from zero. The shell parts together enclose an axial passage which extends between the connecting pieces or sleeves ( 20 ), ( 21 ) of the shell parts ( 3, 4 ) facing away from one another. In the outermost shell part ( 4 ), a lining ( 13 ) is provided, of which the inner lining surface ( 14 ) has a curvature corresponding to the curvature of the outer surface ( 5 ) of the inner shell part ( 3 ).

Vehicle status notification device and a vehicle status notification method for a construction machine

A vehicle status notification device for a construction machine, includes: a key switch connected to a battery; an engine shut-off switch which is serially connected to a downstream side of the key switch in a connection line between the battery and an engine controller configured to control engine operation; and a control unit configured to perform control to notify a notification unit that the engine shut-off switch is in an OFF state in a case that a signal at the downstream side of the engine shut-off switch is in the OFF state while a signal at an upstream side of the engine shut-off switch is in an ON state.

Power transmission apparatus

The power transmission apparatus may include a control device to carry out idling stop control in such a manner that, when it is detected that an operating means is not operated for a predetermined time or more, an engine is stopped, and a clutch is disconnected, and the supply of the electric power from a battery to a motor generator is interrupted, and when it is detected that the operating means is operated afterwards, the engine is started by a cell motor, and the supply of the electric power from the battery to the motor generator is permitted, and the clutch is connected after the number of revolutions Ne of the engine reaches a predetermined value or more, and the supply of the electric power from the battery to the motor generator is interrupted.

DRIVE CONTROL METHOD OF OPERATING MACHINE

In drive control of an operating machine configured to drive a structure by a hydraulic motor configured to be driven by operating oil supplied from a hydraulic pump an electric motor configured to cooperate with the hydraulic motor, a speed command generated based on a manipulation amount of a remote control valve configured to determine an operation amount of the structure is subjected to speed feedback control performed based on the actual rotation speed of the hydraulic motor and pressure difference feedback control performed based on an operating oil pressure difference between a suction port and discharge port of the hydraulic motor. With this, a tilting angle command is generated such that the operating oil, the amount of which is necessary at the actual rotation speed of the hydraulic motor, is ejected, and the tilting angle of the hydraulic pump is controlled. 1. A drive control method of an operating machine configured to drive a structure by a hydraulic motor and an electric motor configured to cooperate with the hydraulic motor , the hydraulic motor being configured to be driven by operating oil supplied from a hydraulic pump through a control valve , the hydraulic pump being configured to be able to change an ejection flow rate by control of a tilting angle of the hydraulic pump ,the method comprising the steps of:causing a speed command, generated based on a manipulation amount of a remote control valve configured to determine an operation amount of the structure, to be subjected to speed feedback control, performed based on an actual rotation speed of the hydraulic motor, and pressure difference feedback control, performed based on an operating oil pressure difference between a suction port and discharge port of the hydraulic motor, to generate a tilting angle command such that the operating oil, the amount of which is necessary at the actual rotation speed of the hydraulic motor, is ejected; andcontrolling the tilting angle of the hydraulic pump.2. ...

System and Method for Calibrating Hydraulic Valves

A system and method for calibrating an electronically actuatable hydraulic valve in a work machine may include at least one supply valve and at least one drain valve to be calibrated and a bypass valve in fluid communication with a pump and a fluid source. The at least one supply valve and the at least one drain valve may be calibrated by opening the at least one supply valve and the at least one drain valve, closing the bypass valve, setting the pump to a desired flow output, determining a first current command for the at least one supply valve corresponding to a first target pressure parameter and determining a second current command for the at least one drain valve corresponding to a second target pressure parameter. 1. A method of calibrating an electronically actuatable hydraulic valve , the method comprising:providing at least one supply valve and at least one drain valve to be calibrated in fluid communication with one another, the at least one supply valve configured to supply hydraulic fluid from a fluid source to at least one hydraulic cylinder via a pump and the at least one drain valve configured to drain hydraulic fluid from the at least one hydraulic cylinder to the fluid source;providing a bypass valve in fluid communication with the pump and the fluid source;opening the at least one supply valve and the at least one drain valve;closing the bypass valve;setting the pump to a desired flow output;determining a first current command for the at least one supply valve corresponding to a first target pressure parameter; anddetermining a second current command for the at least one drain valve corresponding to a second target pressure parameter.2. The method of claim 1 , wherein opening the at least one supply valve and the at least one drain valve comprises applying a current to an actuator of the at least one supply valve and the at least one drain valve to facilitate flow of hydraulic fluid therethrough.3. The method of claim 1 , wherein closing the bypass ...

Construction machine

A construction machine includes an engine unit, a body frame, and mounting portions. The engine unit includes an engine, a hydraulic pump driven by drive force of the engine, and a generator motor disposed between the engine and the hydraulic pump. The generator motor has a rotary shaft connected to an input shaft of the hydraulic pump and to an output shaft of the engine and a first housing fixed on an engine side and a second housing fixed on a hydraulic pump side. The engine is installed on the body frame. The mounting portions are provided to the engine and to the first housing to support the engine unit on the body frame.

Flow control valve for construction machine

A flow control valve for a construction machine is provided, which can constantly control a flow rate of hydraulic fluid supplied to a hydraulic actuator through a flow control spool in a spool. The flow control valve for a construction machine, having a valve body in which a supply passage communicating with a pump passage and actuator ports connected to a hydraulic actuator are formed, and a spool installed in the valve body to be shifted, includes a flow control spool shifted in the spool to variably control a cross-sectional area of a passage connected to the one actuator port if a flow rate of the hydraulic fluid that flows through the supply passage is higher than a set flow rate, a first passage formed on the spool to communicate with the supply passage and a second passage formed on the spool to communication with the one actuator port and having a cross-sectional area that is varied depending on the shifting of the flow control spool.

WORK VEHICLE AND METHOD FOR CONTROLLING A WORK VEHICLE

In a work vehicle, a control section increases the displacement of a hydraulic motor for travel when the drive circuit pressure becomes larger than a target pressure determined according to the engine rotational speed, and reduces the displacement of the hydraulic motor when the drive circuit pressure becomes smaller than the target pressure. The control section increases the target pressure of the hydraulic motor for travel when changing the matching point of the absorption torque curve of the hydraulic pump with respect to the output torque curve of the engine. 1. A work vehicle comprising:an engine;a variable displacement type hydraulic pump for travel driven by the engine;a variable displacement type hydraulic motor for travel driven by a hydraulic oil ejected from the hydraulic pump for travel;a pressure detecting section configured to detect a drive circuit pressure which is the pressure of the hydraulic oil fed from the hydraulic pump for travel to the hydraulic motor for travel;an engine controller configured to adjust an output torque from the engine, anda control section configured to increase a displacement of the hydraulic motor for travel when the drive circuit pressure becomes larger than a target pressure determined according to an engine rotational speed, to reduce the displacement of the hydraulic motor for travel when the drive circuit pressure becomes smaller than the target pressure, and to increase the target pressure of the hydraulic motor for travel when changing a matching point of an absorption torque curve of the hydraulic pump for travel with respect to an output torque curve of the engine from a high rotational speed side to a low rotational speed side.2. The work vehicle according to claim 1 , whereinthe control section is configured to set the target pressure based on a target pressure curve that stipulates the target pressure with respect to the engine rotational speed,the target pressure curve includes a first target pressure curve, ...

Working machine

A working machine rendered to change in setting a maximum value of an absorption torque of hydraulic pump to a rather high value when the working machine is in a specified state, solves problems that, when an operation lever is being operated in an intermediate position of a lever stroke, there occurs a swinging in a machine body due to change-over of a maximum absorption torque setting value so that the operation lever is relatively moved with respect to the machine body to exert an influence on operability and the machine body acting violently. When the maximum absorption torque setting value is E2 position which is good fuel efficiency, upon detection of a full operation of either one or both of the travelling operation member and the boom operation member, controlling to automatically switch to E1 position of a maximum absorption torque larger than that of E2 position is performed.

Hydraulic system for construction machine including emergency control unit for electric hydraulic pump

The present disclosure relates to a hydraulic system for a construction machine which uses an electric hydraulic pump, and more particularly, to a hydraulic system including an emergency control unit for temporarily driving the construction machine when an electronic control unit controlling the electric hydraulic pumps fails to operate. To this end, disclosed is the hydraulic system including the electric hydraulic pump, the electric control unit for controlling the electric hydraulic pump, and the emergency control unit, which operates when the electric control unit fails to operate, so as to temporarily control the electric hydraulic pump in accordance with to a predetermined condition, which can effectively respond to a low load work corresponding to predetermined pressure and to a high load work corresponding to higher pressure, by selectively operating the emergency control unit according to different optional conditions, based on the amount of load (low load, high load) of the working machine that is required when the electric control unit fails to operate.

Work vehicle and control method for work vehicle

A storage section stores inching characteristic information. The inching characteristic information defines a relationship between an inching operation quantity and an inching characteristic value. The inching characteristic value is a value dependent on pilot pressure that is reduced through inching control. A computing section references the inching characteristic information to thereby compute, from the inching operation quantity detected by the inching operation quantity detector, a command value to the pilot pressure control valve. In the inching characteristic information, a rate of lowering the inching characteristic value when the inching operation quantity is within a first range is greater than a rate of lowering the inching characteristic value when the inching operation quantity is within a second range greater than the first range.

WORK VEHICLE AND CONTROL METHOD FOR WORK VEHICLE

A working vehicle includes an engine, a hydraulic pump, a first hydraulic motor, a vehicle speed detecting unit, a parking brake, a parking brake operating member and a control unit. The control unit is configured to determine whether the vehicle speed is equal to or greater than a predetermined threshold when the parking brake operating member is operated. The control unit is configured to execute a brake control that decreases a displacement of the first hydraulic pump and increases a displacement of the first hydraulic motor without activating the parking brake when the vehicle speed is equal to or greater than the redetermined threshold in a state when the vehicle is traveling, and to activate parking brake when the vehicle speed falls below the predetermined threshold. 1. A working vehicle comprising:an engine;a hydraulic pump driven by the engine;a first hydraulic motor driven by hydraulic fluid discharged from the hydraulic pump;a vehicle speed detecting unit configured to detect a vehicle speed;a parking brake;a parking brake operating member configured to be operated to activate the parking brake; and execute a brake control that decreases a displacement of the first hydraulic pump and increases a displacement of the first hydraulic motor without activating the parking brake when the vehicle speed is equal to or greater than the predetermined threshold in a state when the vehicle is traveling and', 'activate the parking brake when the vehicle speed falls below the predetermined threshold., 'a control unit configured to determine whether the vehicle speed is equal to or greater than a predetermined threshold when the parking brake operating member is operated, the control unit being configured to'}2. The working vehicle according to claim 1 , whereinthe control unit is configured to decrease the vehicle speed by gradually increasing a lower limit of the displacement of the first hydraulic motor from the displacement of the first hydraulic motor at a point in ...

Wheel loader and wheel loader control method

A traction force control section of a wheel loader reduces maximum traction. force to below the maximum traction. force with traction force control in an off state when the traction force control is in an on state. The traction force control section increases the maximum traction force when determination conditions are satisfied with the traction force control in the on state. The determination conditions include that the work situation is digging, that the operation amount of the acceleration operation member is the predetermined operation threshold or more, and that a boom angle is the predetermined angle threshold or more.

WHEEL LOADER AND METHOD FOR CONTROLLING WHEEL LOADER

A traction force control section of a wheel loader, when the determination conditions are satisfied during traction force control, increases the maximum traction force. The determination conditions include that the aspect of operation is excavation, that the vehicle speed is less than or equal to a prescribed speed threshold value, that the amount of operation of the accelerator operating member is equal to or more than a prescribed accelerator threshold value, and that the amount of operation of the inching operating member is less than or equal to a prescribed inching operation threshold value. 1. A wheel loader comprising:a work implement including a boom and a bucket;an engine;a hydraulic pump configured to be driven by the engine;a hydraulic motor for travel configured to be driven by a hydraulic fluid ejected from the hydraulic pump;an accelerator operating member configured to be operated to set a target rotational speed of the engine;an inching operating member configured to be operated to reduce a vehicle speed;a traction force control operating member configured to be operated to switch ON or OFF of a traction force control for reducing a maximum traction force;a vehicle speed detecting section configured to detect the vehicle speed;an aspect of operation determining section configured to determine whether or not an aspect of operation is excavation;a vehicle speed determining section configured to determine whether or not the vehicle speed is less than or equal to a prescribed speed threshold value;an accelerator operation determining section configured to determine whether or not an amount of operation of the accelerator operating member is equal to or more than a prescribed accelerator threshold value;an inching operation determining section configured to determine whether or not an amount of operation of the inching operating member is less than or equal to a prescribed inching operation threshold value; anda traction force control section configured ...

Relief Pressure Control Device for Hydraulic Work Machine

A relief pressure control system is provided with a controller for outputting, responsive to an adjustment signal output from a dial switch, a control signal to control a relief pressure of a variable solenoid relief valve, a display unit for displaying, responsive to display signals outputted from the controller, a relationship between a circuit pressure output from a pressure sensor and a pressure required by a hydraulic cylinder, and a control device constituting a start instruction unit for instructing a start of control of the variable solenoid relief valve. Stop valves are arranged in sections of main lines, which communicate a directional control valve and the hydraulic cylinder with each other, to open or close the section. The sections are located between positions on the main lines, where the variable solenoid relief valves are connected to the main lines, respectively, and the hydraulic cylinder.

Systems and Methods for Attachment Control Signal Modulation

In general, systems and methods for controlling work machine implements are described. In one embodiment, a system for controlling a hydraulically-powered third-party work machine implement includes a microcontroller-based conversion module capable of transforming implement control signals from their native format (e.g., PWM) to a signal format required by the implement to function properly (e.g., digital). A hydraulic flow activation signal can be simultaneously generated and transmitted to the implement so that hydraulic flow occurs only when control signals are received and the implement is caused to be in motion or otherwise activated.

EXCAVATION MACHINE WITH AUTO REVERSE

The present disclosure provides an excavation machine that is configured to minimize or otherwise account for the unintended stoppage (i.e., jamming/stalling) of a digger tool. According to an embodiment of the present disclosure a machine is provided with one or more drive systems that automatically stop and reverse to avoid excavation tool jamming. The machine and methods of the present disclosure provide an efficient method and machine for excavation operations. 127-. (canceled)28. An excavation machine comprising:a chassis supported on propulsion structures that are part of a ground drive system for propelling the chassis over a ground surface;an excavation attachment carried by the chassis, the excavation attachment including a digging tool including a plurality of cutting teeth driven by an attachment drive system;an actuator for raising and lowering the excavation attachment relative to the chassis;an electronic control system configured to trigger an auto reverse sequence when an auto reverse trigger condition is detected, wherein the auto reverse sequence includes an action selected from the group consisting of: a) automatically reversing the ground drive system to move the chassis and the excavation attachment carried by the chassis in a reverse direction; and b) automatically reversing the attachment drive system to reverse a cutting motion of the cutting teeth of the digging tool.29. The machine of claim 28 , wherein the auto reverse sequence includes both automatically reversing the ground drive system and automatically reversing the attachment drive system.30. The machine of claim 28 , wherein the excavation machine comprises a trenching boom that is raised and lowered by the actuator claim 28 , and wherein the digging tool comprises a digging chain that is rotated about the trenching boom by the attachment drive system.31. The machine of claim 30 , wherein the digging chain is rotated in a first rotational direction about the trenching boom during ...

Holding valve for construction equipment

The present invention relates to a holding valve that is used for a hydraulic circuit for controlling a working device actuator of construction equipment, and to a holding valve for construction equipment in which a double nut and a sleeve are removed such that an assembling efficiency is improved and the cost is reduced, and further, the abnormal assembling of a piston can be prevented.

FLUID CONVEYANCE SYSTEM FOR EARTHMOVING MACHINE

An earthmoving machine includes a frame, a boom, an elongated member, an attachment, a conduit, and a reel. The frame supports a fluid source. The boom includes a first end coupled to the frame and a second end opposite the first end. The elongated member is movably coupled to the boom and includes a first end and a second end. The attachment is coupled to the second end of the elongated member. The conduit is in fluid communication with the fluid source and conveys fluid between the fluid source and the attachment. The reel supports at least a portion of the conduit. The reel is rotatable to reel in and pay out the conduit as the elongated member moves relative to the boom. 1. An earthmoving machine comprising:a frame supporting a fluid source;a boom including a first end coupled to the frame and a second end opposite the first end;an elongated member movably coupled to the boom, the elongated member including a first end and a second end;an attachment coupled to the second end of the elongated member;a conduit in fluid communication with the fluid source, the conduit conveying fluid between the fluid source and the attachment; anda reel supporting at least a portion of the conduit, the reel being rotatable to reel in and pay out the conduit as the elongated member moves relative to the boom.2. The earthmoving machine of claim 1 , wherein the attachment includes a hydraulic actuator coupled to the elongated member claim 1 , the conduit providing fluid to the hydraulic actuator.3. The earthmoving machine of claim 2 , wherein the attachment includes a bucket pivotably coupled to the second end of the elongated member claim 2 , the hydraulic actuator pivoting the bucket relative to the elongated member.4. The earthmoving machine of claim 1 , wherein the boom includes a shipper shaft extending transversely through the boom claim 1 , the elongated member engaging the shipper shaft such that rotation of the shipper shaft drives the elongated member for translational ...

Hydraulic control system having energy recovery

A hydraulic control system is disclosed for use with a machine. The hydraulic control system may have a pump, a tank, and an actuator. The hydraulic control system may also have at least a first valve configured to control fluid flow between the pump, the tank, a first chamber of the actuator, and a second chamber of the actuator; a second valve fluidly disposed between the second chamber and the tank; and a third valve fluidly disposed between the first and second chambers. The hydraulic control system may further have a controller configured to selectively cause the second valve to block fluid flow from the second chamber of the actuator to the tank, and to selectively cause the third valve to fluidly communicate the first and second chambers of the actuator when the second valve blocks fluid flow from the second chamber of the actuator to the tank.

Drive control system for construction machinery

A drive control system for preventing a sudden slowdown of driving speed to reduce the shock felt by a driver, when compound-operating two-way driving and a work device in an excavator.

BOOM-SWIVEL COMPOUND DRIVE HYDRAULIC CONTROL SYSTEM OF CONSTRUCTION MACHINE

Disclosed is a hydraulic control system for matching the drive speed of a boom up and a swing device according to the operation environment when compound-driving for manipulating boom and swing for excavation compensating error operation. The hydraulic control system of the present invention comprises: an operation mode selection switch for enabling the selection of an operation mode according to the operation environment; an electronic proportional pressure control valve for outputting a control signal pressure that is proportional to the manipulation of the operation mode selection switch when manipulating a boom operation lever for driving the boom up; a variable flow control valve that is placed on a flow channel between a first hydraulic pump and a spool for the swing device, and has an open area thereof that is variably matched proportional to the control signal pressure from the electronic proportional pressure control valve; and a controller having various types of operation modes previously set and stored thereon so as to control the flow being supplied to the spool for the swing device and a spool for the boom merge, according to the operation mode selected when manipulating the operation mode selection switch. 1. A hydraulic control system for a combined boom and swing operation of a construction machine , which includes first and second variable displacement hydraulic pumps , an actuator for a swing device and a work apparatus , which is connected to the first hydraulic pump , an actuator for a work apparatus connected to the second hydraulic pump , and a flow rate control valve configured to control a flow rate of a hydraulic fluid supplied respectively to the actuators for the swing device and the work apparatus from the first and second hydraulic pumps , the hydraulic control system comprising:a work mode selection switch configured to select a preset work mode according to working conditions;an electronic proportional pressure control valve mounted ...

HYBRID EXCAVATOR BOOM ACTUATING SYSTEM AND METHOD FOR CONTROLLING SAME

The present disclosure relates to a hybrid excavator boom actuating system and to a method for controlling the same. The boom actuating system comprises: an electric motor serving as a motor or a generator; an ultra capacitor for storing electricity generated by the electric motor; a hydraulic pump motor driven by the electric motor to supply hydraulic fluid to a boom; a boom control valve which has a closed circuit for selectively connecting or disconnecting an outlet line and an inlet line of the hydraulic pump motor to or from a head or a rod side of the boom; a main pump driven by the engine to supply hydraulic fluid to a bucket, a travel motor or an arm; a motor bypass valve connected to the outlet line and the inlet line to interconnect the outlet line and the inlet line or disconnect the outlet line from the inlet line; and a controller for controlling the electric motor, the hydraulic pump motor, the boom control valve and the motor bypass valve. 1. A boom actuating system for use with a hybrid excavator , comprising:an electric motor operated as a motor or a generator;an electricity storage device configured to store electricity generated in the electric motor;a hydraulic pump motor driven by the electric motor to supply hydraulic fluid to the boom;a boom control valve configured to selectively connect or disconnect an outlet line and an inlet line of the hydraulic pump motor to or from a head or a rod of a boom cylinder operating the boom;a motor bypass valve connected to the outlet line and the inlet line to interconnect the outlet line and the inlet line or disconnect the outlet line from the inlet line; anda controller configured to control the electric motor, the hydraulic pump motor, the boom control valve, and the motor bypass valve.2. The boom actuating system of claim 1 , wherein when descending of the boom is initiated claim 1 , the controller switches the motor bypass valve so that the outlet line and the inlet line are interconnected.3. The boom ...

Shovel

An electric motor receives electric power from an electricity storage module. A drive target is driven by the electric motor. The electricity storage module has a plurality of protection plates, which are stacked up in a stacked direction, and a plate-shaped electricity storage cell, which is interposed between the protection plates adjacent to each other. The protection plates have a positional restriction shape for restricting a relative position with respect to a positional restriction direction which is perpendicular to the stacked direction.

HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE HAVING ELECTRONIC HYDRAULIC PUMP

The present disclosure relates to a hydraulic system for a construction machine having an electronic hydraulic pump, and more particularly, to a hydraulic system which temporarily drives the construction machine when an operation of an electronic control unit controlling an electronic hydraulic pump is abnormal, particularly, when the electronic control unit is not able to perform a control because an operative amount of a joystick input to the electronic control unit is not normally transmitted to the electronic control unit. 1. A hydrualic system for a construciton machine , comprising:electronic hydraulic pumps which are pressure control type variable capacity pumps;a plurality of main control valves configured to selectively control a movement of working oil discharged from the electronic hydraulic pumps;a plurality of working machines and travel motors driven with working oil supplied from a main control valve corresponding to each of the plurality of main control valves; andan electronic control unit configured to control a discharge flow rate of the working oil of the electronic hydraulic pumps based on flow rate signals of the electronic hydraulic pumps and an operative amount of a joystick,wherein when the electronic control unit is not able to perform a normal control due to a failure of transmittance of the operative amount of the joystick to the electronic control unit, the electronic control unit performs an emergency control of permitting the electronic hydraulic pumps to discharge the working oil with a maximum pressure by outputting predetermined pressure control signals to the electronic hydraulic pumps, andthe electronic control unit performs a predetermined control of a swash plate angle of permitting the electronic hydraulic pumps to discharge the working oil at a predetermined flow rate and at a minimum pressure when the joystick is in a neutral state during the emergency control.2. The hydraulic system of claim 1 , further comprising:center ...

OPERATOR INTERFACE WITH TACTILE FEEDBACK

An operator interface assembly for a machine is disclosed. The operator interface assembly comprises a base, an operator input device operable to move in a first direction in relation to the base to a second position and a third position, a first biasing member including a first spring end, and operatively associated with the base and wherein the first spring end is operable to contact the operator input device at a first position and resist movement of the operator input device in the first direction, a second biasing member including a second spring end, and operatively associated with the base and wherein the second spring end is operable to contact the operator input device at the second position, the second position different than the first position, and resist movement of the operator input device in the first direction, and a position sensor. 1. An operator interface assembly for a machine , comprising:a base,an operator input device operable to move in a first direction in relation to the base to a second position and a third position,a first biasing member including a first spring end, and operatively associated with the base and wherein the first spring end is operable to contact the operator input device at a first position and resist movement of the operator input device in the first direction,a second biasing member including a second spring end, and operatively associated with the base and wherein the second spring end is operable to contact the operator input device at the second position, the second position different than the first position, and resist movement of the operator input device in the first direction, anda position sensor configured to generate a position signal for generating a machine control command, the position signal indicative of the operator input device position.2. The operator interface assembly of claim 1 , wherein the operator input device is pivotably connected to the base.3. The operator interface assembly of claim 1 , ...

Electro-hydraulic system for recovering and reusing potential energy

A hydraulic system includes a hydraulic actuator, a pump configured to supply fluid to the hydraulic actuator, and a first accumulator fluidly connected to the hydraulic actuator. The first accumulator is configured to store fluid received from the hydraulic actuator. The hydraulic system also includes a motor drivingly connected to the pump and fluidly connected to the first accumulator. The motor is configured to receive the stored fluid from the first accumulator to drive the pump. The hydraulic system further includes a first discharge valve fluidly connected between the first accumulator and the hydraulic actuator. The first discharge valve is configured to supply the stored fluid from the first accumulator to the hydraulic actuator without the stored fluid from the first accumulator circulating through the pump.

Construction machine

A construction machine includes a condenser 24 for cooling refrigerant for an air conditioner; a fan 21 for cooling the condenser 24 by using forward cooling air produced during normal-rotation drive; other cooled objects such as a radiator 25 and the like disposed under the lee of the forward cooling air with respect to the condenser 24 ; a refrigerant pressure detector 27 for detecting the pressure of the refrigerant flowing in the condenser 24 ; and a controller 136 for executing reverse-rotation stop processing for returning the fan 21 to the normal-rotation drive when the pressure P of the air conditioner refrigerant detected by the refrigerant pressure detector 27 reaches a preset normal-rotation return pressure P 1 during reverse-rotation drive of the fan 21 . Thus, the lowering of the cooling effect of an air conditioner can be suppressed while reducing the burden of cleaning an engine room.

CONTROL DEVICE FOR HYBRID CONSTRUCTION MACHINERY

The present invention includes a target rotation speed setup section () for setting a target rotation speed of an engine (); load detection means () for detecting a load on a hydraulic pump (); an assist output computation section () for calculating an assist output to be generated by a motor generator in accordance with a rotation speed deviation ΔN, which is the difference between an actual rotation speed and the target rotation speed, or in accordance with the load on the hydraulic pump; an absorption torque upper limit computation section () for calculating an absorption torque upper limit value of the hydraulic pump (); and an operation signal generation section () for generating the operation signal to be output to a pump displacement adjustment device (). When the rotation speed deviation ΔN is equal to or more that a setting NC which is determined in accordance with the assist output value, the absorption torque upper limit computation section reduces the absorption torque upper limit value of the hydraulic pump from the calculated value. 1. A control device for a construction machine having an engine , a variable displacement hydraulic pump driven by the engine , a hydraulic actuator driven by a hydraulic fluid discharged from the hydraulic pump , a motor generator for exchanging torque with the engine , electrical storage means for supplying electric power to the motor generator , and pump displacement adjustment means for adjusting the displacement of the hydraulic pump in accordance with an operation signal , the control device comprising:actual rotation speed detection means that detects an actual rotation speed of the engine;target rotation speed setup means that sets a target rotation speed of the engine;assist output computation means that calculates an assist output value that is to be generated by the motor generator in order to assist the output of the engine;absorption torque upper limit computation means that calculates an absorption torque ...

Hybrid-type construction machine

A hybrid-type construction machine is provided which permits swing operation without a sense of awkwardness compared with conventional construction machines and which allows the amount of stored electricity in an electrical storage device to be controlled within an appropriate range of use in consideration of the service life of the electrical storage device without enlarging its capacity. The hybrid-type construction machine includes an electric motor and a hydraulic motor for driving a swing structure, an electrical storage device, and a controller for controlling charging and discharging of the electrical storage device. The controller includes a storage unit which stores a discharge command region to be set in accordance with the swing speed of the swing structure with regard to the amount of stored electricity in the electrical storage device, and a computing unit which, if the amount of stored electricity in the electrical storage device reaches the discharge command region stored in the storage unit, computes an additional drive torque command value for increasing the amount of powering of the electric motor in accordance with the amount of stored electricity in the electrical storage device, the computing unit further outputting the additional drive torque command value to the electric motor to drive the swing structure.

Control Valve Attachment Structure for Construction Machine

A mount structure for a control valve unit is provided to permit selective mounting of a small first control valve unit or a large second control valve unit on bodies of construction machines of different models the same family without incurring an increase in the number of kinds of parts or components. The control valve unit may be a small first control valve unit or a large second control valve unit. The mount structure is constructed such that upon mounting the first or second control valve unit on a bracket on which the first or second control valve unit may be selectively mounted, a barycentric position of the bracket with the first control valve unit mounted thereon and a barycentric position of the bracket with the second control valve unit mounted thereon are located on an imaginary line connecting paired hanging-member fixing portions of the bracket. 1. A mount structure for a control valve unit on a construction machine having working equipment , a body with the working equipment attached thereto , a hydraulic actuator for driving the working equipment and a hydraulic actuator for driving the body , and the control valve unit comprised of plural directional control valves arranged side by side for controlling the hydraulic actuators , respectively ,said mount structure having a bracket for mounting the control valve unit thereon and being to be fixed on the body, wherein:the control valve unit comprises a first control valve unit, and a second control valve unit having plural directional control valves set at a greater arrangement pitch than an arrangement pitch of plural directional control valves included in the first control valve unit and formed larger than the first control valve unit,the bracket has a pair of hanging-member fixing portions and is used to mount thereon only one of the first control valve unit and second control valve unit although the first control valve unit and the second control valve unit can each be mounted on the bracket, ...

Display device for work machine

Disclosed is a display device 5 for a work machine having an engine 9, a hydraulic pump 10 driven by the engine, a boom cylinder 3 d , an arm cylinder 3 e , a bucket cylinder 3 f , and other actuators driven by a hydraulic fluid supplied from the hydraulic pump 10, and an operating device 6 for operating the actuators 3 d, 3 e, 3 f . The display device 5 includes an idle state display section 50 a for displaying an engine revolution speed N as no-manipulation period operating state information which is related to an engine load that is imposed while the operating device 6 is not manipulated. This makes it possible to inform an operator of the status of the engine load in an idle state for the purpose of prompting the operator to transition into a fuel-efficient state.

IMPLEMENT COUPLING SYSTEM FOR A POWER MACHINE

An implement locking system for locking an implement to an implement carrier of a power machine is disclosed. The implement locking system includes a locking mechanism having a locking pin with an extended position for locking the implement to the implement carrier and a retracted position for mounting or removing the implement from the implement carrier. A user input provides a signal indicative of an operator intent to move the locking pin to the retracted position. A locking actuation valve controls the locking mechanism to automatically and continuously extend the locking pin in the absence of the signal being indicative of the intent to move the locking pin to the retracted position. The locking actuation valve moves the locking pin to the retracted position only for the time corresponding to the signal being indicative of moving to the retracted position. 1. An implement locking system for locking an implement to an implement carrier of a power machine , comprising:a locking mechanism having at least one locking pin positionable to releasably lock the implement to the implement carrier, the at least one locking pin having an extended position which locks the implement to the implement carrier when the implement is mounted on the implement carrier, and a retracted position in which the implement can be mounted on or removed from the implement carrier;an input device configured to provide a signal, when actuated by an operator, indicative of an affirmative operator intent to move the at least one locking pin to the retracted position; anda locking actuation valve operatively coupled to the user input to receive the signal and coupled to the locking mechanism to control the locking mechanism, the locking actuation valve configured to control the locking mechanism to automatically and continuously extend the at least one locking pin in the absence of the signal being indicative of the affirmative operator intent to move the at least one locking pin to the ...

SHOVEL AND METHOD FOR CONTROLLING SHOVEL

An hydraulic shovel according to the present invention includes a lower running body , an upper turning body turnably mounted on the lower running body , a boom pivotably attached to the upper turning body , an arm pivotably attached to the boom , a bucket attached to the arm , an boom angle sensor S which detects a condition of the boom , an attachment condition determining part which determines whether the boom is within a predetermined upper working range based on a detection value of the boom angle sensor S, and an operating condition switching part which switches an operating condition of the hydraulic shovel. The operating condition switching part slows down a movement of the bucket if the attachment condition determining part determines that an attachment is within the predetermined upper working range UWR. 1. A shovel comprising:a lower running body;an upper turning body turnably mounted on the lower running body;a front working machine including a boom, an arm, and an end attachment;a front working machine condition detecting part configured to detect a condition of the front working machine;an attachment condition determining part configured to determine whether the boom is within a predetermined upper working range based on a detection value of the front working machine condition detecting part; andan operating condition switching part configured to switch an operating condition of the shovel;wherein the operating condition switching part slows a movement of the end attachment if the attachment condition determining part determines that the end attachment is within the predetermined upper working range, in comparison to a case where the attachment condition determining part determines that the end attachment is not within the predetermined upper working range.2. The shovel as claimed in claim 1 , wherein the arm is driven by hydraulic oil discharged from a hydraulic pump claim 1 , and the operating condition switching part slows a movement of the end ...

APPARATUS FOR IMPROVING EXCAVATING OPERATION CHARACTERISTIC AND GRADING OPERATION CHARACTERISTIC OF EXCAVATOR

Disclosed is an apparatus for improving excavating operation characteristic and grading operation characteristic of an excavator. The apparatus includes a solenoid valve group and a hydraulically controlled selector valve. An oil controlling output A of the solenoid valve group is configured in series with oil controlling input a of the hydraulic control valve. An oil controlling output A of the solenoid valve group is configured in series with a pilot control end XBa of a multi-port valve group. An oil return port T of the solenoid valve group is connected to the hydraulic oil tank. An oil controlling output b of the hydraulically controlled selector valve is connected to a pilot control end XAb of the multiplexer valve group, and an oil return port T of the hydraulically controlled selector valve is connected with the hydraulic oil tank. The apparatus improves operational efficiency and control comfortability. 1. An apparatus for improving excavating operation characteristic and grading operation characteristic of an excavator , the apparatus comprising:{'b': 3', '5', '6', '8', '4', '7, 'a hydraulic oil tank (), a right control lever valve (), a left control lever valve (), a multiplexer valve group (), a solenoid valve group () and a hydraulically controlled selector valve (), wherein{'b': 5', '1', '4', '1', '8, 'the right control lever valve () is configured, via a BOOM UP end, in parallel with an oil controlling net P of the solenoid valve group () and a pilot control end XBa of the multiplexer valve group ();'}{'b': 6', '2', '4', '1', '8, 'the left control lever valve () is configured, via an ARM DUMP end, in parallel with an oil controlling net P of the solenoid valve group () and a pilot control end XBa of the multiplexer valve group (); and'}{'b': 1', '4', '1', '7', '2', '4', '2', '8', '1', '4', '3, 'an oil controlling output A of the solenoid valve group () is configured in series with oil controlling input a of the hydraulic control valve (), an oil ...

Hydraulic circuit for progressive engagement of a hydraulic device

The present invention relates to a hydraulic circuit comprising: an accumulator ( 11 ) a hydraulic device ( 1 ) a primary line ( 12 ) and a secondary line ( 13 ) connecting each said accumulator ( 11 ) to the hydraulic device ( 1 ), the primary line ( 12 ) comprising a restriction ( 14 ) and a primary distributor ( 15 ) adapted to selectively connect the hydraulic device ( 1 ) to the accumulator ( 11 ) or to a tank (R), the secondary line ( 13 ) comprising a secondary distributor ( 16 ) alternating between a first configuration in which it blocks the secondary line ( 13 ), and a second configuration in which it is passing, said secondary distributor ( 16 ) being controlled via the pressure within the primary line ( 12 ) downstream of the primary distributor ( 15 ) relative to the hydraulic accumulator ( 11 ), such that switching from the first to the second configuration of the secondary distributor ( 16 ) takes place only when the pressure in the primary line ( 12 ) reaches a threshold value.

TILTABLE TOOL ASSEMBLY

A fluid-powered tool actuator usable with a vehicle having an arm and a rotation link for rotation of the tool actuator in a first plane and being laterally tiltable in a second transverse plane. In some embodiments pressurized fluid is communicated using distribution channels and passageways internal to the actuator to limit use of external hydraulic lines. In some embodiments the tool actuator has certain components in a compressive pre-loaded state to reduce their fatigure failure during operation of the tool actuator under load. 1. A fluid-powered tool actuator connectable to a source of pressurized fluid remote from the tool actuator and usable with a vehicle having an arm and a rotation link associated therewith for rotation of the tool actuator in a first plane defined by movement of the rotation link relative to the arm , each of the arm and rotation link having an attachment member located toward a free end thereof , and usable with a tool having a first tool attachment member and a second tool attachment member spaced away from the first tool attachment member , the tool actuator comprising:a body having a longitudinal axis and first and second body ends;an output shaft rotatably disposed within said body in general coaxial arrangement with said body for rotation of said shaft and said body relative to each other with one of said shaft and said body being a stationary member and the other of said shaft and said body being a rotatable member, said shaft having a first shaft end portion toward said first body end and a second shaft end portion extending toward said second body end, said first shaft end portion having an outward surface portion with first and second circumferentially extending fluid distribution channels formed therein;first, second, third and fourth fluid ports for operation of the tool actuator in response to the selective application of pressurized fluid thereto from the source of pressurized fluid, said first fluid port in fluid ...

WORK VEHICLE

A wheel loader () has a tire (). The wheel loader () includes a hydraulic pump (), a hydraulic oil tank () disposed at a position higher than the hydraulic pump () and connected to the hydraulic pump (), a check valve () disposed at a position lower than the hydraulic oil tank () and connected to the hydraulic oil tank (), a filter () disposed at a position lower than an upper surface (US) of the tire () in a side view and connected to the check valve (), and a pipe () extending to a first position (H) lower than the check valve () and further extending from the first position (H) to a second position (H) as a higher position than the check value () is set as the second position (H), and connected to the filter () at the second position (H). Accordingly, it is possible to provide a work vehicle capable of inhibiting a hydraulic oil from spilling out in exchanging the filter (). 1. A work vehicle having a tire , comprising:a hydraulic pump;a hydraulic oil tank disposed at a position higher than said hydraulic pump and connected to said hydraulic pump;a check valve disposed at a position lower than said hydraulic oil tank and connected to said hydraulic oil tank;a filter disposed at a position lower than an upper surface of said tire in a side view and connected to said check valve; anda pipe extending to a first position lower than said check valve and further extending from said first position to a second position as a higher position than said check value is set as said second position, and connected to said filter at said second position.2. The work vehicle according to claim 1 , wherein said pipe constitutes an oil accumulation member after said filter is removed.3. The work vehicle according to claim 1 , wherein said pipe is connected to an upper surface of said filter.4. The work vehicle according to claim 1 , wherein said pipe is connected to a side surface of said filter.5. The work vehicle according to claim 1 , wherein said check valve includes a housing ...

METHOD AND A DEVICE FOR REDUCING VIBRATIONS IN A WORKING MACHINE

A method for reducing vibrations in a working machine is provided. The working machine includes a hydraulic system with a hydraulic machine for providing hydraulic fluid to at least one working function. The hydraulic machine is driven by a drive source haying a variable speed of rotation. The method includes identifying a resonance frequency for the working machine, and controlling the drive source so as to counteract waves with the resonance frequency. 1. A method for reducing vibrations in a working machine , the working machine comprising a hydraulic system with a hydraulic machine for providing hydraulic fluid to at least one working function , the hydraulic machine being driven by a drive source having a variable speed of rotation , comprisingidentifying a resonance frequency for the working machine, andcontrolling the drive source so as to counteract waves with the resonance frequency.2. A method according to claim 1 , comprising controlling the drive source by changing the speed of rotation of the drive source.3. A method according to claim 2 , comprising controlling the drive source by increasing the speed of rotation of the drive source.4. A method according to claim 2 , comprising controlling the drive source by decreasing the speed of rotation of the drive source.5. A method according to claim 2 , comprising compensating for the changed rotation of speed of the drive source by changing the displacement of the hydraulic machine so as to keep the hydraulic flow to the working function substantially unchanged.6. A method according to claim 3 , comprising compensating for the increased rotation of speed of the drive source by draining hydraulic fluid from the hydraulic machine to a hydraulic tank so as to keep the hydraulic flow to the working function substantially unchanged.7. A method according to claim 2 , comprising varying the speed of rotation of the drive source during one and the same rotation axis revolution of the drive source.8. A method ...

Meterless hydraulic system having force modulation

A hydraulic system is disclosed. The hydraulic system may have a pump configured to draw low-pressure fluid from one of a first passage and a second passage and discharge fluid into the other of the first and second passages, and an actuator coupled to the pump via the first and second passages. The hydraulic system may also have at least a first control valve fluidly connected between the first and second passages to selectively direct fluid from one of the first and second passages to bypass the pump and flow into the other of the first and second passages. The hydraulic system may further have at least a second control valve fluidly connected in parallel with the at least a first control valve to selectively direct fluid from one of the first and second passages to bypass the actuator and flow into the other of the first and second passages.

CONTROL SYSTEM FOR CONSTRUCTION MACHINE

A fuel-efficient hydraulic fluid has a lower viscosity than a standard hydraulic fluid, a pressure loss decreases, and thus, when control based on a standard model is exercised, the speeds of various actuators increase. However, the speeds need not be increased beyond the speeds of the standard model. Instead, it is preferred that fuel efficiency be improved. As a result, an engine revolution speed decreases by 50 rpm and a pump torque decreases by 5%. This reduces an engine output. Therefore, when a hydraulic fluid is changed from the standard hydraulic fluid to the fuel-efficient hydraulic fluid, the fuel efficiency can be improved while maintaining operability equivalent to that of the standard model. Hence, the fuel efficiency can be improved while maintaining the operability when an item affecting the fuel consumption is replaced. In addition, the settings can be changed with ease by a service technician. 1124. A control system for a construction machine having a plurality of items including an engine () , a hydraulic pump () driven by the engine , an actuator () driven by a hydraulic fluid discharged from the hydraulic pump , and a member driven by the actuator , at least one of the items being selectively changeable from one item state to another , the control system comprising:item state selection means for selecting one of a plurality of item states; andengine revolution speed/pump torque setting change means for changing the setting of an engine revolution speed and the setting of a pump torque in accordance with the item state selected by the item state selection means.2. The control system according to claim 1 , wherein the item that is selectively changeable from one item state to another is an item affecting the fuel consumption of the construction machine.3. The control system according to claim 2 , wherein the item affecting the fuel consumption of the construction machine is an item affecting the weight of a vehicle body.4. The control system ...

ELECTRIC DRIVE UNIT FOR CONSTRUCTION MACHINE

An electric drive unit for a construction machine is capable of increasing the operating time of the construction machine. The electric drive unit has an electricity storage device, a hydraulic pump of the fixed displacement type which is driven by a motor/generator, a plurality of directional control valves which respectively control the flow of hydraulic fluid supplied to a plurality of hydraulic actuators, a bidirectional converter which performs variable control on the revolution speed of the motor/generator, and an LS control device which controls the bidirectional converter so that LS differential pressure Pls equals a target value Pgr. The bidirectional converter performs regeneration control for converting the inertial force of the rotor of the motor/generator into electric power thereby charging the electricity storage device when the revolution speed of the motor/generator is decreased in response to an excess of the LS differential pressure Pls over the target value Pgr. 172973029222337372223333433343022233737. An electric drive unit for a construction machine equipped with an electricity storage device () , a motor/generator () which supplies and receives electric power to/from the electricity storage device () , a hydraulic pump () which is driven by the motor/generator () , a plurality of hydraulic actuators ( , ) , a plurality of operating means (A , B) which command the operation of the hydraulic actuators ( , ) , and a plurality of directional control valves ( , ; A , A) which respectively control the direction and the flow rate of hydraulic fluid supplied from the hydraulic pump () to the hydraulic actuators ( , ) according to operating directions and operation amounts of the plurality of operating means (A , B) , the electric drive unit comprising:{'b': 28', '29, 'motor/generator control means () which performs variable control on the revolution speed of the motor/generator (); and'}{'b': 45', '45', '66', '70', '28', '22', '23, 'command control ...

CONTROL METHOD FOR DRIVING A RIPPER

The control method for driving a ripper pertaining to the eight invention is a method for driving a ripper in which the movement of a ripper attached to the rear of the body of a bulldozer is controlled, said method comprising a first step in which the ripper is operated while the bulldozer is moving forward or is stopped, a second step in which the bulldozer is reversed and the ripper is raised, and a third step in which the ripper is automatically raised. 1. A control method for driving a ripper , in which the movement of a ripper attached to the rear of the body of a bulldozer is controlled , said method comprising:a first step in which it is detected that ripping work by the ripper has ended;a second step in which a first control of pulling the ripper out of a ground and a second control of tilting back the ripper are selectively executed when it is detected that the ripping work has ended.2. The control method for driving a ripper according to claim 1 ,wherein a first mode of executing the first control selectively is set in the second step.3. The control method for driving a ripper according to claim 1 ,wherein the first control is executed when it is detected that the ripping work has been ended by moving the steering lever to the reverse side during ripping work and by raising the ripper with the operating lever, in the second step.4. The control method for driving a ripper according to claim 1 ,wherein the second control is executed when it is detected that the steering lever has been moved to the reverse side during ripping work and tilt-back has been performed with the operating lever of the ripper, in the second step.5. The control method for driving a ripper according to claim 3 ,further comprising a third step in which the first control is released when it is detected that the hydraulic pressure in the hydraulic circuit of the bulldozer has risen over a specific relief pressure, or that the bulldozer is moving forward or is stopped, or that the ripper ...

Movable type ladder device for work vehicle

A movable type ladder device for a work vehicle includes a ladder main body, a drive mechanism, and an up-and-down lock mechanism. The ladder main body has first and second end portions in a longitudinal direction thereof with the first end portion being rotatably supported with respect to the vehicle body. The drive mechanism is configured to move the ladder main body between a boarding posture and a retracted posture by rotating the ladder main body at an angle of 90 degrees. The up-and-down lock mechanism is configured to restrict the ladder main body set in the retracted posture from moving in an up-and-down direction. The rotational center axis is disposed perpendicularly to the longitudinal direction of the ladder main body set in the boarding posture in a front view, and perpendicularly to the longitudinal direction of the ladder main body set in the retracted posture in a plan view.

ELECTRIC DRIVE UNIT FOR CONSTRUCTION MACHINE

An electric drive unit for a construction machine is capable of increasing the operating time of the construction machine. The electric drive unit has an electricity storage device, a hydraulic pump of variable displacement type which is driven by a motor/generator, a regulator which performs variable control on the displacement volume of the hydraulic pump, a bidirectional converter which performs variable control on the revolution speed of the motor/generator, and an LS control device which controls the regulator and the bidirectional converter so that LS differential pressure Pls equals a target value Pgr. The bidirectional converter performs regeneration control for converting the inertial force of the rotor of the motor/generator into electric power thereby charging the electricity storage device when the revolution speed of the motor/generator is decreased in response to an excess of the LS differential pressure Pls over the target value Pgr. 172973029222337372223333433343022233737. An electric drive unit for a construction machine equipped with an electricity storage device () , a motor/generator () which supplies and receives electric power to/from the electricity storage device () , a hydraulic pump () of the variable displacement type which is driven by the motor/generator () , a plurality of hydraulic actuators ( , ) , a plurality of operating means (A , B) which command the operation of the hydraulic actuators ( , ) , and a plurality of directional control valves ( , ; A , A) which respectively control the direction and the flow rate of hydraulic fluid supplied from the hydraulic pump () to the hydraulic actuators ( , ) according to operating directions and operation amounts of the plurality of operating means (A , B) , comprising:{'b': 31', '30, 'pump control means () which performs variable control on the displacement volume of the hydraulic pump ();'}{'b': 28', '29, 'motor/generator control means () which performs variable control on the revolution ...

HYDRAULIC VALVE DEVICE

A hydraulic valve device includes a first and a second engine port to a double acting hydraulic motor, a pump, a hand valve which has two open positions, wherein in the first open position the pump is fluidly connected to the first engine port and the tank is fluidly connected to the second engine port; and wherein in the second open position the pump is fluidly connected to the second engine port and the tank is fluidly connected to the first engine port, with a first nonreturn valve, arranged between the pump and second engine port. A piston which by way of the load pressure in the first engine port via a line governs the first nonreturn valve, and a second nonreturn valve arranged, as long as the hand valve is in its first open position, to connect the first engine port to the second engine port. 1. A hydraulic valve device , comprising:a double acting hydraulic motor (D), in particular a double acting hydraulic cylinder, with a first engine port (L) and a second engine port (N);a tank (T);a pump (I);a hand valve (H) connecting the first and second engine ports (L, N) to the tank (T) and the pump (I), said hand valve (H) having first and second open positions,wherein, in the first open position, the pump (I) is connected to the first engine port (L) via a first line (F), and the tank (T) connected to the second engine port (N) via a second line (G), andwherein, in the second open position, the pump (I) is connected to the second engine port (N) via the second line (G), and the tank (T) is connected to the first engine port (L) via the first line (F);{'b': 1', '8, 'a first nonreturn valve (A, ) arranged to operate between the pump (I) and the second engine port (N) and opens towards the second engine port (N);'}{'b': 2', '1', '8', '1', '8, 'a piston () that, by means of a load pressure in the first engine port (L) via a third line (E), governs the first nonreturn valve (A, ) such that the first nonreturn valve (A, ) is kept closed as long as a pump pressure does ...

HYDRAULIC CONTROL SYSTEM HAVING OVER-PRESSURE PROTECTION

A hydraulic control system for a machine is disclosed. The hydraulic control system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, an actuator, and a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The hydraulic system may also have a main relief valve movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid directed to the actuator exceeds a first threshold pressure, and a controller in communication with the pump. The controller may be configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid directed to the actuator exceeds a second threshold pressure. 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 direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator;a main relief valve movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid at the actuator exceeds a first threshold pressure; anda controller in communication with the pump and configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid at the actuator exceeds a second threshold pressure.2. The hydraulic control system of claim 1 , wherein:the first threshold pressure is about 32-34 MPa; andthe second threshold pressure is about 35-35.5 MPa.3. The hydraulic control system of claim 2 , wherein the main relief valve is configured to move to a fully opened position when the pressure of the fluid at the actuator reaches a third threshold pressure higher than the second threshold pressure.4. The hydraulic control system of claim 3 , wherein the third ...

HYDRAULIC CONTROL SYSTEM HAVING SWING OSCILLATION DAMPENING

A hydraulic control system is disclosed. The hydraulic control system may have an input device to generate a first signal indicative of a desired swing motor movement, and a control valve configured to selectively pass fluid to the swing motor and drain from the swing motor to drive the swing motor based on the first signal. The hydraulic control system may also have a pressure sensor to generate a second signal indicative of a swing motor pressure, a speed sensor configured to a third signal indicative of a swing motor speed, and a controller configured to make a comparison of at least one of the swing motor speed and the swing motor pressure with a threshold speed and a threshold pressure, and open the control valve to drain fluid from the swing motor to the tank based on the comparison when the input device is in a neutral condition. 1. A hydraulic control system , comprising:a tank;a pump configured to draw fluid from the tank and pressurize the fluid;a swing motor;an input device configured to generate a first signal indicative of a desired movement of the swing motor;at least one control valve configured to selectively pass pressurized fluid from the pump to the swing motor and from the swing motor to the tank to drive the swing motor based on the first signal;a pressure sensor configured to generate a second signal indicative of a pressure at the swing motor;a speed sensor configured to generate a third signal indicative of a speed of the swing motor; and determine a condition of the input device based on the first signal;', 'make a comparison of at least one of the speed of the swing motor and the pressure at the swing motor with a threshold speed and a threshold pressure, respectively; and', 'selectively open the at least one control valve to drain fluid from the swing motor to the tank based on the comparison when the condition of the input device is a neutral condition., 'a controller in communication with the input device, the at least one control valve, ...

Hydraulic control system having swing motor recovery

A hydraulic control system is disclosed for use with a machine. The hydraulic control system may have a tank, a pump, a swing motor, and at least one control valve configured to control fluid flow between the pump, the swing motor, and the tank. The hydraulic system may also have an accumulator configured to selectively receive pressurized fluid discharged from the swing motor and selectively supply pressurized fluid to the swing motor, at least one accumulator valve, and a controller. The controller may be configured to receive input indicative of a difference between desired and actual speeds of the swing motor, and determine if the swing motor is accelerating or decelerating based on the difference. The controller may also be configured to control the at least one accumulator valve to cause the accumulator to selectively receive or supply pressurized fluid only when the swing motor is accelerating or decelerating.

WORK VEHICLE AND WORK VEHICLE CONTROL METHOD

A lock valve switching section switches a lock valve from a locked state to a released state when a lock member is switched from a locked position to a release position. An erroneous operation monitoring section maintains the lock valve in the released state when the pilot pressure is equal to or more than a predetermined pressure when elapsed time, which is from a point in time where the lock member is switched from the locked position to the release position, is equal to or more than the predetermined time. The erroneous operation monitoring section switches the lock valve to the locked state when the pilot pressure is equal to or more than the predetermined pressure when the elapsed time is less than the predetermined time. 1. A work vehicle comprising:a hydraulic actuator;an operation member configured to operate the hydraulic actuator;a pilot valve configured to output a pilot pressure according to operation of the operation member;an actuator control valve configured to control the hydraulic actuator according to the pilot pressure input thereto;a lock member switchable between a locked position and a release position;a lock valve switchable between a released state in which the lock valve permits supply of the pilot pressure to the actuator control valve and a locked state in which the lock valve blocks the supply of the pilot pressure to the actuator control valve;a lock valve switching section configured to switch the lock valve from the locked state to the released state when the lock member is switched from the locked position to the release position;an elapsed time detection section configured to detect elapsed time from a point in time when the lock member is switched from the locked position to the release position;an elapsed time determination section configured to determine whether the elapsed time is equal to or more than a predetermined time;a pilot pressure determination section configured to determine whether the pilot pressure is equal to or ...

Hydraulic accumulator health monitor

A system and method to diagnose the operational health of a hydraulic accumulator are provided. The system can include a hydraulic accumulator selectively coupled to a hydraulic actuator, such as a swing motor. The accumulator can be charged by movement of the actuator. A pressure sensor can be associated with the accumulator to determine an accumulator pressure. A controller can be connected to the pressure sensor. The controller can determine a charge curve based on a relationship between an actuator operational parameter associated with the actuator movement and the accumulator pressure. The controller can compare the charge curve to a previously defined charge curve or range to determine an error between the charge curve and the previously defined charge curve or range. The degree of the error can be associated with the operational health of the accumulator, and if too large, the operator may be notified of the status.