КЛАПАН УПРАВЛЕНИЯ РАСХОДОМ, СОДЕРЖАЩИЙ УСТРОЙСТВО ПРЕОБРАЗОВАНИЯ ДВИЖЕНИЯ

ПРИВОДНОЕ УСТРОЙСТВО

VORRICHTUNG ZUR BEFESTIGUNG VON PERFORIERLINIEN AN ZYLINDERN BEI DRUCKMASCHINEN.

To produce perforated lines across the width of webs of paper a cylinder of a rotary printing machine is equipped with a slot across in which a suitable rule or cutter blade is clamped by a clamping strip. The strip has a number ofblind bores, joined by a channel and equipped with plungers. The pressure is exerted by a thermoplastic elastomer which is filled in the channel and cylinder as a liq. and which is pressurised by a sealed thrust screw.

Ziehender Rollmembran-Zylinder ohne Zugankerkonstruktion mit innerem und äußerem Rollbereich

Air bleed valve for hydraulic system of motor vehicle, has sealing element that closes outlet opening in rotary position of housing for air flow in direction of fluid channel, by prestressing of sealing element

The valve (10) has a sealing element e.g. O-ring, prestressed relative to a fluid channel. The element is compressed by a housing for closing the channel in an axial direction with respect to an outlet opening of the channel, in a rotary position of the housing. The element is released by the housing in the axial direction, in another rotary position of the housing. The element closes the opening in the latter position for air flow in a direction of the channel, by prestressing of the element. The element opens the opening for air flow in a direction of the housing.

Hydraulisches Steuer- und Stellsystem mit Volumenausgleich

Hydraulisches Steuer- und Stellsystem mit mindestens einem Hydraulikzylinder (1), in dem ein Zylinderkolben (3) bewegbar ist, der den Hydraulikzylinder (1) in eine kolbenseitige Stelldruckkammer (4) und eine kolbenstangenseitige Stelldruckkammer (5) trennt, und einer Hydropumpeneinheit (2), wobei ein erster Anschluss (10) der Hydropumpeneinheit (2) an einer ersten Anschlussseite (6) mit der kolbenseitigen Stelldruckkammer (4) verbunden ist, wobei ein mit dem ersten Anschluss (10) einen geschlossenen hydraulischen Kreislauf (39) bildender zweiter Anschluss (12) an einer zweiten Anschlussseite (78) mit der kolbenstangenseitigen Stelldruckkammer (5) des Hydraulikzylinders (1) verbunden ist, wobei ein dritter Anschluss (11) mit der kolbenseitigen Stelldruckkammer (4) des Hydraulikzylinders (1) zur Ver- und Entsorgung der kolbenseitigen Stelldruckkammer (4) mit einer der Hydraulikfluidmengendifferenz zwischen kolbenseitiger Stelldruckkammer (4) und kolbenstangenseitiger Stelldruckkammer (5) ...

Hydrostatisches System bestehend aus einer hydraulischen Verstellpumpe und einem mit dieser verbundenen hydraulischen Motor

Fluidic control system

HYDRAULIC REMOTE CONTROL SYSTEM

A hydraulic or pneumatic drive system, and a motor and a pump therefor

HYDRAULIC TELEMOTOR APPARATUS

Improvement in a hydraulic control apparatus for actuating a remotely located mechanism having a shipping and installation restraining strap for an actuator having a housing and a linearly moveable output member projecting from the front end of the housing, the strap being non-elastic and rupturable and having a part thereof engageable with the free end of the output member and another part projecting rearwardly toward the rear end of the housing, the improvement comprising an elastic anchor arrangement for the restraining strap to allow full extension thereof without rupture thereof, a stop and positioning arrangement for the elastic anchor arrangement which predetermines the retracted position in which the output member is yieldably held, and an override arrangement to selectively debar functioning of the elastic anchor arrangement whenever it is intended to rupture the restraining strap.

A hydraulic or pneumatic drive system, and a motor and a pump therefor

A fluid motor 212 for a pneumatic or hydraulic drive system comprises: at least one piston means 226; at least one cylinder means 204a, 204b; motion conversion means and a sleeve means 205, 206. The or each cylinder and an end of the or each piston defines a chamber 234a, 234b.The or each cylinder is coupled to a pressure generation and transmission system arranged to cause alternating flow of fluid into and out of the or each chamber to cause reciprocating movement of the piston. The motion conversion means comprises: at least one portion (215) extending continuously and circumferentially around a central axis and extending in part longitudinally relative to the central axis, for example a non-linear groove, and at least one linking means 208a, 208b, 209a, 209b. The at least one portion and the or each linking means are relatively rotatable about the central axis. A one of the at least one linking means or the at least one portion is coupled to the at least one piston means so that reciprocating ...

A Pneumatic Operated Transmitter and Receiver for the Visual Indication of Signals, Orders and the like.

... 123,422. Cole, S. W., and Hannaford, C. March 6, 1918. Pneumatic telegraphs.-A pneumatically-operated order telegraph for use on ships, aeroplanes, &c., comprises flexible air chambers B, B<1> at the transmitting and receiving stations, respectively. arranged in casings A, A<1>, fitted with indicating dials over which move pointers K, K'. The pointer K is attached to a screwed shaft F, operable by a nut H, and on turning this nut movement is imparted to the chamber B through lever and link mechanism E<1>, E<2>, E<3>, the last of which moves about an adjustable pivot n carried by an adjustable screw-block n'. Variations in pressure in the chamber B are transmitted by a pipe c to the chamber B<1>, and movements of the flexible chamber B' are transmitted to the pointer K<1> by means of a lever P and chain passing over a drum Q on the spring-controlled shaft of the pointer K'. When the pointer K is at zero position it is held by a spring-catch I engaging a recess in the top of casing A, and ...

Actuator module

Industrial system with synthetically commutated variable displacement fluid working machine

HYDRAULIC APPARATUS

Fluidic control system

A pressurised medium operated installation

A HYDRAULIC OR PNEUMATIC DRIVE SYSTEM, AND A MOTORAND A PUMP THEREFOR

Hydraulic system i.e. dispenser-slave-force deflection system, for e.g. deep drawing press, has piston, where counter pressure on piston is generated with compressible container i.e. hydraulic cylinder, that is located within piston

The hydraulic system has a slidable piston (9) supported in an accumulator (6) in a liquid-proof manner. The piston is pressurized by a hydraulic fluid, where a corresponding counter pressure is exerted on the piston. The counter pressure on the piston is generated with a compressible container i.e. hydraulic cylinder, on a side that is turned away from the hydraulic fluid. The container encloses a predetermined gas amount, where the container is located within the piston.

HYDRAULISCHE DRUCKVERSORGUNGSEINHEIT, SOWIE ELEKTROHYDRAULISCHE ARBEITSEINHEIT UND SPANNSYSTEM MIT EINER DERARTIGEN DRUCKVERSORGUNGSEINHEIT

Eine hydraulische Druckversorgungseinheit weist zwei abwechselnd druckbeaufschlagte Ausgänge (6, 7), eine reversierbare Pumpeneinheit mit zumindest zwei Pumpen (9, 10) und einen alle Pumpen gemeinsam antreibenden reversierbaren Elektromotor (11), sowie eine Versorgung für Hydraulikmedium auf. Um bis zum Erreichen eines vorgebbaren Druckniveaus eine große Menge an Hydraulikmedium und nach Erreichen dieses Druckniveaus Hydraulikmedium mit großem Druck zur Verfügung zu stellen, ist eine Pumpe als Niederdruckpumpe (10) und eine Pumpe als Hochdruckpumpe (9) ausgelegt, wobei die druckbeaufschlagten Ausgänge beider Pumpen an den gleichen Ausgang (6, 7) der Druckversorgungseinheit gelegt sind. Die Hochdruckpumpe (9) ist von der Niederdruckpumpe (10) durch Rückschlagventile (10, 13) getrennt und ist jede Pumpe (9, 10) über ein eigenes Wechselventil (14, 15) mit der Versorgung für Hydraulikmedium verbunden. Beide Ausgänge der Niederdruckpumpe (10) sind über Druckschaltventile (16, 17) mit dem Tank ...

DEVICE FOR THE ATTACHMENT OF PERFORIERLINIEN AT CYLINDERS WITH PRINTERS.

HYDRAULIC ACTUATING SYSTEM WITH ELECTRIC CONTROL

Selon l'invention, un circuit hydraulique (17) et une valve de commande (18) sont dimensionnés pour pou-voir effectuer la grande majorité des actionnements de la gou-verne (3), qui nécessitent une puissance inférieure aux perfor-mances maximales du système. Par ailleurs, une pompe hy-draulique bidirectionnelle (23), entraînée par un moteur élec-trique (24), peut fournir une puissance d'appoint qui, addi-tionnée à la puissance dudit circuit (17), permet d'assurer les-dites performances maximales.

FLOW CONTROL VALVE HAVING A MOTION CONVERSION DEVICE

A motion conversion device (200) including a body (310), a first double-acting cylinder (320) movable along a first axis (A4) and a second double-acting cylinder (330) movable along a second axis angled relative to the first axis. The body includes several bores which form a closed circuit and house the first and second double-acting cylinders. Movement of the first double-acting cylinder along the first axis hydraulically or pneumatically pushes the second double-acting cylinder along the second axis. Also disclosed is a valve incorporating a motion conversion device with angled double-acting cylinders for moving a closure member between an open position and a closed position, and a method for opening and closing a valve by way of angled double-acting cylinders.

Elektrodynamische Antriebsvorrichtung

Vorrichtung zur hydraulischen Kraftübertragung.

Vorrichtung zur Verstellung eines Regelorgans an einer hydraulisch gesteuertem Maschine

Kupplung für die Verbindung von zwei Teilen einer Leitung für die Übertragung eines hydrostatischen Druckes

Procédé de mesure de la conductibilité thermique d'un matériau en plaque, et appareil pour sa mise en oeuvre

Hydraulische Steuerung für elektrische Schalter, insbesondere für Hochspannungsdruckgasschalter

DEVICE FOR AUTOMATIC CONTROL OF WORKING WIDTH OF THE FIRST PLOW BODY WITH ACCOUNT OF VARIABLE WORKING WIDTH SUBSEQUENT PLOW BODIES

Motion conversion equipment that valve and being used for was used together with control valve

Device of reference of effort or movement without articulation

Improvement with the hydraulic systems

MECHANICAL AERIAL MATCHING TRANSFORMER

Hydraulic control, in particular for circuit breaker of high voltage to compressed gas

HYDRO-MECHANICAL DEVICE OF TRANSMISSION Of EFFORT

HYDRAULIC SYSTEM

... a) Système hydraulique destiné à amortir les vibrations produites par des pics de pression. b) Système hydraulique comportant un cylindre récepteur, un cylindre émetteur, une conduite de fluide sous pression qui les relie ainsi qu'au moins un clapet de limitation de pression (1) qui est intégré dans le système hydraulique, commute en fonction d'une pression du fluide sous pression et comprend au moins deux raccords (3a, 4a) pour l'entrée et la sortie du fluide sous pression et au moins un canal (14, 15) reliant entrée et sortie, caractérisé par le fait que le canal peut être obturé au moyen d'une pièce élastique (12, 13). c) Dans un véhicule à moteur, l'invention permet d'amortir les vibrations, produites par le vilebrequin du moteur à combustion interne, qui se transmettent à l'embrayage, à l'installation de freinage et à la direction assistée.

Hydraulic apparatus servo-motor

OIL PRESSURE EQUIPMENT CONTROL SYSTEM

The present invention relates to an oil pressure equipment control system. The oil pressure equipment control system comprises: an oil pressure pump; a motor for operating the oil pressure pump; a proportion pump for controlling the supply amount of an operating oil supplied to oil pressure equipment; a power source unit for individually applying an operating voltage having a different variable range and an operating current having a different variable range to the oil pressure pump and the proportion pump; a power controller unit for outputting a power control signal using the operating voltage and the operating current; an inverter for applying the operating voltage to the motor according to the power control signal; a plurality of sensor units for sensing predetermined characteristics of the oil pressure equipment; a PLC unit for analyzing the characteristics detected in the sensor unit; a power detection unit for detecting a power usage amount for the power supplied to each apparatus ...

ARTIFICIAL MUSCLES COMPRISING AN ELECTRODE PAIR AND ARTIFICIAL MUSCLE ASSEMBLIES INCLUDING SAME

An artificial muscle that includes a housing having an electrode region and an expandable fluid region and an electrode pair positioned in the electrode region, the electrode pair having a first electrode fixed to a first surface of the housing and a second electrode fixed to a second surface of the housing. The first and second electrodes each have two or more tab portions and two or more bridge portions. Each of the two or more bridge portions interconnects adjacent tab portions and at least one of the first and second electrodes includes a central opening positioned between the two or more tab portions and encircling the expandable fluid region. A dielectric fluid is housed within the housing and the electrode pair is actuatable between a non-actuated and an actuated state such that actuation from the non-actuated to actuated state directs the dielectric fluid into the expandable fluid region.

Hydraulic assembly for an injection moulding machine

Hydraulic actuation device of a rod vehicle with a variable throttle element

ПРИВОДНОЕ УСТРОЙСТВО

Изобретение касается приводного устройства (1), имеющего ведущий узел (3) и ведомый узел (19). Ведомый узел (19) включает в себя первый узел (15) линейных перемещений, имеющий первое ведомое звено (7), и соединенный по текучей среде через систему (27) трубопроводов с первым узлом (15) линейных перемещений второй узел (16) линейных перемещений, имеющий второе ведомое звено (8). Ведущий узел (3) гидравлически соединен с системой (27) трубопроводов. Для отклонения ведомых звеньев (7, 8) посредством ведущего узла (3) возможен обмен текучей средой между первым узлом (15) линейных перемещений и вторым узлом (16) линейных перемещений. Первый узел (15) линейных перемещений и второй узел (16) линейных перемещений имеют по элементу (12, 25) предварительного напряжения. В соответствии с изобретением эти элементы (12, 25) предварительного напряжения оперты в противоположном направлении на подвижно установленный зажим (4). Технический результат – обеспечение постоянного усилия на ведомом узле. 7 з.п ...

ГИДРАВЛИЧЕСКАЯ ИЛИ ПВНЕМАТИЧЕСКАЯ ПРИВОДНАЯ СИСТЕМА, ДВИГАТЕЛЬ И НАСОС ДЛЯ НЕЕ

ГИДРАВЛИЧЕСКАЯ ИЛИ ПНЕВМАТИЧЕСКАЯ ПРИВОДНАЯ СИСТЕМА, ДВИГАТЕЛЬ И НАСОС ДЛЯ НЕЕ

Variables Drosselglied und hydraulische Betätigungseinrichtung eines Kraftfahrzeuges mit einem variablen Drosselglied

Zur Beibehaltung eines gewünschten Fluid-Volumenstroms unabhängig von der Viskosität eines Fluids wird ein variables Drosselglied für eine hydraulische Betätigungseinrichtung mit einem Gehäuse, durch das ein Fluidkanal verläuft und mit einem innerhalb des Fluidkanals angeordneten Ventilelement vorgeschlagen. Bei einer Fluid-Viskositätsänderung erfährt das Ventilelement zur Ausführung einer Form- oder Lageänderung eine Stellkraft, wodurch eine lokale Beeinflussung des Fluidkanalquerschnitts erzielt wird, welche einer Betragsänderung des Fluid-Volumenstroms entgegenwirkt. Zur Darstellung der Stellkraft an dem Ventilelement wird ein viskositätsabhängiger Druckabfall erzeugt. Weiter wird eine hydraulische Betätigungseinrichtung eines Kraftfahrzeugs mit einem solchen variablen Drosselglied vorgeschlagen.

ELEKTROMECHANISCHE KRAFTFAHRZEUG-BREMSVORRICHTUNG

Hydraulic vane motor for hydraulic system, with spring-loaded sealing strips in vane slots, and with each working chamber having at least four slit apertures in path

The motor has at least two working chambers and flows in both directions. Sealing strips (12) are removably fitted to corresponding vane slots (10). They are loaded against the path by the vanes (11). Each working chamber has at least four slit apertures (16a, 16b) in the path. There should preferably also be grooves (20-22) parallel to the slit apertures.

Piezohydraulischer Aktor

Die Erfindung betrifft einen Piezohydraulischer Aktor (1), der als ein vier Kammern aufweisendes System ausgebildet ist, wobei eine erste Kammer ein von einem Piezoaktor (5) bewegbarer, mit einer Hydraulikflüssigkeit (7) gefüllter Antriebsbalg (3) ist, der über ein erstes Rückschlagventil (RV1) hydraulisch mit einer als ein mit der Hydraulikflüssigkeit (7) gefüllter Hydraulikzylinder (9) ausgebildeten zweiten Kammer als ersten Abtrieb (A1) verbunden ist, dessen Gehäuse und dessen Hydraulikkolben (11) an einen mit der Hydraulikflüssigkeit (7) gefüllten und eine dritte Kammer ausbildenden Abtriebsbalg (13) als zweiten Abtrieb (A2) mechanisch parallel gekoppelt sind, wobei der Antriebsbalg über ein zweites Rückschlagventil (RV2) hydraulisch mit einer mit der Hydraulikflüssigkeit (7) gefüllten vierten Kammer als Reservoir (15) verbunden ist, wobei dieser über ein drittes Rückschlagventil (RV3) mit dem Abtriebsbalg (13) und der Hydraulikzylinder (9) über ein viertes Rückschlagventils (RV4) mit ...

Lichtmikroskop inverser Bauart

A hydraulic or pneumatic drive system, and a motor and a pump therefor

A pedal-driven vehicle or machine comprising a hydraulic or pneumatic drive system is provided. The system comprises a fluid pump, a fluid motor and a pressure transmission system. The fluid pump 410 comprises: a drive shaft 439 mounted in a bracket of the vehicle or machine, and rotatable about an axis by a pedalling action; a cam 441 mounted on the drive shaft; at least three piston means 401a-c; and for each piston means, a corresponding cylinder means 403a-c, wherein an end of each piston means 401a-c and the corresponding cylinder means 403a-c define a chamber. The at least three piston means 401a-c are arranged relative to the cam 441 so that rotation of the cam 441 with the drive shaft 439 causes reciprocating movement of each piston means 401a-c in the corresponding cylinder means 403a-c. The fluid motor is configured to drive a wheel. The pressure transmission system utilises fluid, operatively coupled to the or each chamber and to the fluid motor, wherein the reciprocating movement ...

HYDRAULIC CONTROL APPARATUS HAVING AN INSTALLATION RESTRAINING STRAP

Fluidic control system

Improvements in valve gear for hydraulic control transmission pipe lines

... 576,033. Hydraulic transmission of power. ARNOLD, H. I., and EXACTOR CONTROL CO., Ltd. Nov. 22, 1943, No. 19518. [Class 69 (ii)] In a remote control system comprising a. transmitter A and receiver B, a valve device C, inserted in the conduit 10 between them, comprises a non-return valve 22 and a relief valve 28 mounted on a diaphragm 30 sensitive to pressure changes in the conduit between the transmitter and the device. The spring 33 acting on the diaphragm and transmitter spring 8 are such that changes in pressure between the device and transmitter due to leakage or temperature variations affect only the transmitter. While pressure can be transmitted to the receiver through the non-return valve, reverse loads due to pressure on the receiver merely close the valves ; but return of the transmitter to original position causes a drop in pressure on the conduit 10 which acts on the diaphragm and causes the relief valve to open. The relief valve may be manually actuated. In a modification one ...

Improvements in hydraulic telemotor systems

... 669,995. Telemotor systems. STARCK, G. P. B. Aug. 27, 1948, No. 22660/48. Class 69 (ii). In a telemotor system of the type comprising a transmitting member and a receiving member each including a hydraulic cylinder and a piston therein one element of each member, i.e. either the piston or cylinder being movable and the other stationary and a pump positively driven by the movable element of the transmitting member during predetermined portions of its strokes for supplying liquid to the system so as to compensate for leakage the movable element of the receiving member is positively stopped in a predetermined position during each operative stroke for defining one end of each such stroke and a relief valve is provided for permitting any surplus liquid to escape at a pressure above the normal working pressure of the system. As shown, fixed pistons 2, 4 co-operate with movable cylinders 1, 3 respectively. The transmitter cylinder actuates a piston 16 which pumps oil into the system and an adjustable ...

Improvements in or relating to hydraulic actuators

A hydraulic actuator has a master piston and cylinder arrangement (10 and 11) and a slave piston and cylinder arrangement (18 and 19) connected by passageways (17 and 25) each leading from separate chambers (15 and 16) formed between the stepped contacting surfaces of the master piston (10) and cylinder (11). Fluid expelled from the chambers may be diverted away from the slave piston and cylinder arrangement by indexing valves (20 and 26) so that the ratio of slave piston output displacement to master piston displacement may be controlled. The valves may be electrically operated to provide a fast response to varying load demands. ...

HYDRAULIKSYSTEM

The hydraulic system has a slidable piston (9) supported in an accumulator (6) in a liquid-proof manner. The piston is pressurized by a hydraulic fluid, where a corresponding counter pressure is exerted on the piston. The counter pressure on the piston is generated with a compressible container i.e. hydraulic cylinder, on a side that is turned away from the hydraulic fluid. The container encloses a predetermined gas amount, where the container is located within the piston.

HYDRAULIKSYSTEM

A positioning device

A hydraulic or pneumatic drive system, and a motor and a pump therefor

Hydraulic and pneumatic drive systems and fluid motors (12) and fluid pumps (10) therefor are disclosed. In such systems, rotation motion is converted to reciprocating motion or vice versa. In particular, a motion conversion means comprises a portion extending continuously and circumferentially around a central axis and extending in part longitudinally relative to the central axis, and a linking means, wherein the portion and the linking means are relatively rotatable about the central axis and a one of the linking means and the portion is fixedly coupled to a piston means, wherein the linking means and the portion are configured to cooperate whereby the reciprocating movement of the piston means causes relative rotary motion of the other of the portion and the linking means about said central axis. The other of the portion and the linking means may be coupled to a sleeve means to cause rotation thereof.

SYSTEM FOR POSITIONING AN OPERATING CYLINDER, USE OF THE SYSTEM, AND MACHINE

In the positioning system for an operating cylinder (1), a valve or a set of valves (6; 10, 11) comprises means for allowing a free supply of hydraul ic fluid from a pump fluid chamber (8) of a pump cylinder (7) into an operat ing fluid chamber (2) of the operat ing cylinder (1), for preventing the bac k flow of hydraulic fluid from the operating fluid chamber (2) into the pump fluid chamber (8) when the hydraulic fluid pressure on the control side (A) rises above a predetermined pressure limit, and for allowing a free back fl ow of hydraulic fluid from the operating fluid chamber (2) into the pump flu id chamber (8) when the hydraulic fluid pressure on the control side (A) goe s below the predetermined pressure limit. An operating piston rod (3) follow s closely the movement of a pump piston rod (9), and the valve or the set of valves (6; 10, 11) prevents pressure fluctuations from transmitting from th e operating side (B) to the control side (A). The system can be used for ins tance in ...

A HYDRAULIC OR PNEUMATIC DRIVE SYSTEM, AND A MOTOR AND A PUMP THEREFOR

Hydraulic and pneumatic drive systems and fluid motors (12) and fluid pumps (10) therefor are disclosed. In such systems, rotation motion is converted to reciprocating motion or vice versa. In particular, a motion conversion means comprises a portion extending continuously and circumferentially around a central axis and extending in part longitudinally relative to the central axis, and a linking means, wherein the portion and the linking means are relatively rotatable about the central axis and a one of the linking means and the portion is fixedly coupled to a piston means, wherein the linking means and the portion are configured to cooperate whereby the reciprocating movement of the piston means causes relative rotary motion of the other of the portion and the linking means about said central axis. The other of the portion and the linking means may be coupled to a sleeve means to cause rotation thereof.

AIRCRAFT HYDRAULIC SYSTEM

An aircraft hydraulic system for operating a plurality of hydraulically-operated actuators in the aircraft having a hydraulic reservoir in which hydraulic fluid is stored, a hydraulic distribution system coupling the hydraulic reservoir to the actuators and having a main flow line coupled to the hydraulic reservoir, a hydraulic pump fluidly coupled to the main flow line and the hydraulic reservoir to pump hydraulic fluid from the reservoir to the main flow line, a main filtration system fluidly coupled to the main flow line upstream of at least some of the actuators, and a self-cleaning filter fluidly coupled upstream of the main filtration system.

HYDRAULIC SYSTEM

MULTIPLE-CIRCUIT BRAKE INSTALLATIONS FOR VEHICLES

Hydraulic device of order

Improvements with the orders of machine parts by fluids under pressure

HYDRAULIC ACTUATOR

Shifting of speed hydraulic for displacements of low amplitude

Small pneumatic drive for construction kit - includes operating cylinder with mechanical plug-in connections and connected with air bellows to generate air pressure

A motor for a hydraulic or pneumatic drive system

Hydraulic and pneumatic drive systems and fluid motors and fluid pumps therefor are disclosed. In such systems, rotation motion is converted to reciprocating motion or vice versa. In particular, a motion conversion means comprises a portion extending continuously and circumferentially around a central axis and extending in part longitudinally relative to the central axis, and a linking means, wherein the portion and the linking means are relatively rotatable about the central axis and a one of the linking means and the portion is fixedly coupled to a piston means, wherein the linking means and the portion are configured to cooperate whereby the reciprocating movement of the piston means causes relative rotary motion of the other of the portion and the linking means about said central axis. The other of the portion and the linking means may be coupled to a sleeve means to cause rotation thereof.

HYDRAULIC FORCE TRANSDUCER

The invention relates to a hydraulic force transducer having a primary unit that has a primary piston, movable by a drive unit in a stationary primary cylinder, and having a secondary unit that has at least one secondary cylinder and at least one secondary piston, wherein the primary unit and the secondary unit together delimit a pressurizing medium space. To this end, the primary cylinder and primary piston are staged, wherein a comparably large face of the primary piston delimits a primary pressure space of the primary cylinder during a first partial stroke of the primary piston, and a comparably small face of the primary piston delimits a fine control pressure space of the primary cylinder during a second partial stroke of the primary piston. A hydraulic force transducer having a primary unit is thus created, comprising only one cylinder-piston combination and wherein a combination of a rapid movement and an operation cycle or inching (having comparably high maximum force) can be created ...

A positioning device

СИСТЕМА УСТАНОВКИ РАБОЧЕГО ЦИЛИНДРА В ЗАДАННОЕ ПОЛОЖЕНИЕ, ПРИМЕНЕНИЕ СИСТЕМЫ И МАШИНА

Система, применение системы предназначены для установки рабочего органа машины, например, типа ротор-отверстие для снятия древесной коры или подъемных стрел и шарнирно сочлененных стрел-манипуляторов в заданное положение. В системе, содержащей рабочий цилиндр (1), клапан или группа клапанов (6; 10, 11) содержит средства подачи гидравлической текучей среды из камеры (8) перекачивающего цилиндра (7) в камеру (2) рабочего цилиндра (1), предотвращающие обратный поток гидравлической текучей среды из камеры (2) в камеру (8) перекачивающего цилиндра (7), когда давление гидравлической текучей среды на стороне (А) управления поднимается выше заданного предельного давления, и обеспечения свободного обратного потока гидравлической текучей среды из камеры (2) в камеру (8) перекачивающего цилиндра (7), когда гидравлическое давление текучей среды на стороне (А) управления падает ниже заданного предельного давления. Шток (3) рабочего поршня близко следует перемещению штока (9) поршня перекачивающего цилиндра ...

СИСТЕМА УСТАНОВКИ РАБОЧЕГО ЦИЛИНДРА В ЗАДАННОЕ ПОЛОЖЕНИЕ, ПРИМЕНЕНИЕ СИСТЕМЫ И МАШИНА

... 1. Система установки в заданное положение рабочего цилиндра (1), который является гидравлическим цилиндром, приводящим в действие инструмент (17, 19, 21) машины, и который содержит камеру (2) для рабочей текучей среды и шток (3) рабочего поршня, предназначенный для регулировки объема указанной камеры, содержащая перекачивающее устройство (4; 7), предназначенное для перекачивания гидравлической текучей среды в рабочий цилиндр для перемещения штока рабочего поршня, гибкий гидравлический трубопровод (5), предназначенный для направления гидравлической текучей среды между перекачивающим устройством (4; 7) и рабочим цилиндром, и клапан или группу клапанов (6; 10, 11), предназначенных для управления потоком гидравлической текучей среды в гибком гидравлическом трубопроводе, причем перекачивающим устройством (4) является перекачивающий цилиндр (7), который является гидравлическим цилиндром и содержит камеру (8) для текучей среды и шток (9) поршня, выполненный с возможностью перемещения для регулировки ...

ГИДРАВЛИЧЕСКАЯ ИЛИ ПНЕВМАТИЧЕСКАЯ ПРИВОДНАЯ СИСТЕМА, ДВИГАТЕЛЬ И НАСОС ДЛЯ НЕЕ

Группа изобретений относится к области машиностроения, в частности к насосам для приводных систем. Гидравлический или пневматический насос для приводной системы содержит двигатель, цилиндрическое средство для поршневого средства. Гидравлическая или пневматическая приводная система содержит насос, линию передачи давления для цилиндрического средства, двигатель. Гидравлический или пневматический двигатель для приводной системы содержит поршневые средства и цилиндрическое средство. Узел втулки содержит двигатель. Гидравлическая или пневматическая приводная система содержит двигатель, линию передачи давления для цилиндрического средства, насос. Гидравлическая или пневматическая приводная система содержит линию для передачи давления, насос, двигатель. Машина или транспортное средство с приводом от педалей содержит приводную систему. Достигается повышение надежности. 7 н. и 15 з.п. ф-лы, 42 ил.

ELEKTRISCH-GESTEUERTES, HYDRAULISCHES ANTRIEBSSYSTEM

Hydraulische Türbetätigung mit einem Rollmembranzylinder

Die Erfindung betrifft ein hydraulisches Betätigungssystem für ein Kraftfahrzeug, mit einem stellenden Betätigungsorgan wie einem Türgriff, und einer aufgrund der Stellbewegung des Betätigungsorgans reagierenden Ein- und/oder Ausrückeinrichtung, wie einer Türverriegelungs- oder Türöffnungseinrichtung, etwa nach Art eines Türschlosses, wobei das Betätigungsorgan mit der Ein- und/oder Ausrückeinrichtung in Wirkbeziehung steht, wobei in dem Betätigungsorgan und/oder der Ein- und/oder Ausrückeinrichtung ein Rollmembranzylinder enthalten ist. Die Erfindung betrifft auch ein Verschlusssystem aus einer Fahrzeugklappe oder einer Fahrzeugtür, wie einer Autotür, einer Motorhaube oder einem Kofferraumdeckel, mit einem hydraulischen Betätigungssystem der erfindungsgemäßen Art.

A HYDRAULIC ACTUATOR FOR CONNECTION TO A RESERVOIR

The hydraulic actuator comprises a hydraulic master cylinder (12) having an outlet (12e) for connection to a slave cylinder (14) through a working fluid conduit (15) and an inlet port (12d) for connection to the outlet port (23) of a reservoir (10). A supply conduit (16) is provided to establish fluid communication between the two said ports (12d, 23). The supply conduit in one embodiment is normally connected at one end to one of the ports and has a coupling (22) at its free other end to enable it to be connected to the other port. The coupling includes a seal (24c) which normally closes the free end of the supply conduit but which opens as a result of connection to the other port.

A hydraulic or pneumatic drive system for a pedal-driven vehicle or machine

LIQUID PRESSURE CONTROL SYSTEMS

... 1314042 Telemotor systems AUTOMOTIVE PRODUCTS CO Ltd 15 June 1971 [19 June 1970] 29921 /70 Addition to 1249122 Heading F1P A telemotor as described and claimed in the parent Specification 1249122 is modified in that the diaphragm 73 of the slave unit 68 is loaded by a coiled compression spring 86.

A hydraulic or pneumatic drive system, and a motor and a pump therefor

Hydraulic system

CONSTRUCTION MACHINE

MECHANISM ACTUATED PNEUMATICALLY

Hydraulic shifting device for clutches

HYDRAULIC SYSTEM

Hydraulic system i.e. transmitter-receiver energy diverting system, for deep drawing press, has receiving cylinder with working piston pressurized at side by container i.e. gas pressurized spring, where side is turned away from fluid

The system has a fluid pipeline (2) fluidically connected with a pressure storage for providing hydraulic fluid between a receiving cylinder (3) and a transmitting cylinder. The receiving cylinder has a working piston (5), which is pressurized at a side by a container i.e. gas pressurized spring (11). The container is reducible in volume and includes preset gas amount to oppose the pressure of the hydraulic fluid, and is arranged within a piston of the transmitting cylinder. The side is turned away from the hydraulic fluid.

Powered signal controlled hand actuated articulating device and method of use

An articulating device for aiding a user, such as, a surgeon or other medical practitioner, in manipulating a hand-actuated articulating device by providing a powered force used for moving the device, thus reducing or eliminating the need for the user to provide all the force required to move the device. The articulating device includes an input device, which receives one or more user inputs to direct a slave portion to perform work. The articulating device further includes a control portion that assists in transferring user input to the slave portion, and that further provides power assistance to at least partially drive the slave portion, in combination with the user input received by the input device.

A HYDRAULIC ACTUATOR FOR CONNECTION TO A RESERVOIR

HYDRAULIC ACTUATING SYSTEM WITH ELECTRIC CONTROL

ACTUATOR DEVICE

The invention relates to an actuator device (1) having a drive unit (3) and an output unit (19). The output unit (19) comprises a first translation unit (15) having a first output (7) and a second translation unit (16), connected in a fluid manner to the first translation unit (15) via a pipeline system, having a second output (8). The drive unit (3) is connected to the pipeline system (27) in a fluid manner. To deflect the outputs (7, 8), a fluid can be exchanged between the first translation unit (15) and the second translation unit (16) by means of the drive unit (3). The first translation unit (15) and the second translation unit (16) each have a pre-clamping element (12, 25). According to the invention, said pre-clamping elements (12, 25) are supported in the opposite direction against a movably mounted clamping (4).

DEVICE FOR AUTOMATIC ADJUSTMENT OF THE WORKING WIDTH OF A FIRST PLOUGH BODY IN ACCORDANCE WITH SUBSEQUENT PLOUGH BODIES' VARIABLE WORKING WIDTH

A device for automatically adjusting the working width of the first plough body (111) of a plough (1) in accordance with the variable working width of subsequent plough bodies (112, 113), in which a first hydraulic cylinder (13) is arranged to displace a rear frame section (117) laterally relative to a front frame section (116), and a second hydraulic cylinder (14) is arranged to pivot the rear frame section (117) around a first vertical pivoting axis (119) in order thereby to adjust a transverse spacing of the plough bodies (111, 112, 113) by the plough bodies (111, 112, 113) pivoting around second vertical pivoting axes (115), wherein the first hydraulic cylinder (13) is a multi-stage cylinder in which a first cylinder stage (131) forms a main lateral control, and a second cylinder stage (132) forms an automatic working-width control for the first plough body (111), the second cylinder stage (132) being in hydraulic-fluid communication with the second hydraulic cylinder (14) in a master-slave ...

FLUID PRESSURE DRIVE UNIT AND SNOW REMOVAL UNIT

There is provided a fluid pressure drive unit that can fulfill a position holding function stably even when an external force acts during the time when the position is held, the unit being used, for example, for the right and left angle adjustment of a snow plow blade. There is provided a first excessive load relief valve 6 for letting a working fluid escape from a bottom-side pipe line 10a, which connects the bottom-side port of a single-rod double acting cylinder 2 to the bottom side of an operate check valve 4, to a rod-side pipe line 10b, which connects the rod-side port of the single-rod double acting cylinder 2 to the rod side of the operate check valve 4, and there is provided a second excessive load relief valve 7 for letting the working fluid escape from the rod-side pipe line 10b to a tank 3. Also, there is provided a negative pressure preventing check valve 8 for allowing the working fluid to flow into the bottom-side pipeline 10a from the tank 3.

GAVAGE ADDITIONAL CIRCUIT HYDROSTATIC TRANSMISSION

Fluid pressure transmission device and robot hand device

A fluid pressure transmission device is equipped with a plurality of driving fluid pressure cylinders 37 1 , 37 2 , a plurality of driven fluid pressure cylinders 23, 24 with cylinder chambers 23 a, 24 a thereof being communicated with cylinder chambers 371 1 , 371 2 of the main driving fluid pressure cylinders 37 1 , 37 2 via fluid pressure transmission pipes 38 1 , 38 2 , and a sub driving fluid pressure cylinder 41 which is divided into two cylinder chambers 41 a, 41 b by a piston 412, and the fluid pressure generated by the main driving fluid pressure cylinders 37 1 , 37 2 is transmitted to the driven fluid pressure cylinders 23, 24. Pistons 371 1 , 371 2 are driven by the main motor 40, and the piston 412 is driven by the assistant motor 43. The fluid pressure transmission pipes 38 1 , 38 2 and the cylinder chambers 41 a, 41 b of the sub driving fluid pressure cylinder are connected via connecting pipes 42 1 , 42 2 .

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.

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

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.

Hydrostatic drive for a machine

A hydrostatic drive including a hydrostatic pump configured to supply a transmission fluid. The hydrostatic drive further includes an axle motor and a drum motor. The axle motor is configured to drive a set of traction wheels and the drum motor is configured to drive a drum. The hydrostatic drive also includes an axle drive line and a drum drive line. The axle drive line and the drum drive line are connected to the axle motor and the drum motor respectively to supply the transmission fluid. A manifold integrally connected to the hydrostatic pump to operatively couple the axle drive line and the drum drive line with the hydrostatic pump.

Powered signal controlled hand actuated articulating device

An articulating device for aiding a user, such as, a surgeon or other medical practitioner, in manipulating a hand-actuated articulating device by providing a powered force used for moving the device, thus reducing or eliminating the need for the user to provide all the force required to move the device. The articulating device includes an input device, which receives one or more user inputs to direct a slave portion to perform work. The articulating device further includes a control portion that assists in transferring user input to the slave portion, and that further provides power assistance to at least partially drive the slave portion, in combination with the user input received by the input device.

PROCESS FOR THE PRODUCTION OF HYDRAULIC ENERGY AND PRODUCTION OF POTABLE WATER BY DIRECT OSMOSIS

The present invention relates to a process for the production of hydraulic energy by direct osmosis from two saline solutions having different concentrations made to pass through one or more modules of semipermeable membranes having a double inlet and outlet port, originally designed to execute the process of inverse osmosis, without a requirement to realise any technical modification to said modules of membranes. In this manner, an osmotic potential is produced in the membranes creating a current of solution having a pressure sufficient to produce hydraulic energy. A further object of the present invention is the installation designed to produce hydraulic energy according to the stated procedure and the use thereof, together with a desalination plant and a tertiary waste water treatment plant comprising the installation to produce hydraulic energy. 125-. (canceled)26. Process for the production of hydraulic energy by direct osmosis from two saline solutions having different concentrations , a first concentrated one and a second diluted one , characterized in that ,the concentrated saline solution is brine with a degree of salinity comprised between 5 and 100 g/l, and the diluted saline solution is brackish water from an effluent of a tertiary waste water treatment plant with a degree of salinity comprised between 0 and 50 g/l, and always below the degree of salinity of the brine;{'b': 1', '2', '3', '4', '5', '4', '5', '6', '7', '6', '7', '2', '1, 'the direct osmosis is carried out in at least one module () of inverse osmosis semipermeable membranes (), which comprises a casing (); two separate supply inlets (, ) for the solutions inside the module, a first supply inlet () for the brine and a second supply inlet () for the brackish water; two separate outlets (, ) for two flows generated inside the module by means of direct osmosis, a first outlet () for a diluted brine flow, and a second outlet () for a concentrated brackish water flow; and semipermeable membranes ...

HYDRAULIC TRANSMISSION CIRCUIT WITH MULTIPLE CAPACITIES

A hydraulic transmission circuit comprising three or four coupled hydraulic elementary motors, each elementary motor having a first and a second secondary enclosure. The circuit includes four distribution valves for which the respective outlet channels may be selectively connected to two main conduits for supplying fluid to and discharging fluid from the circuit. The outlet channels of the first and second valves are connected to at least one of the first secondary enclosures; those of the third and fourth valves are connected to at least one of the second secondary enclosures. Each of the elementary motors has a first secondary enclosure connected to a single valve from among the first or second valve and a second secondary enclosure connected to a single valve from among the third or fourth valve. The valve pairs thereby connected to said elementary motors respectively, are all distinct, two by two. 2. The circuit according to claim 1 , comprising exactly three elementary motors claim 1 , and wherein said outlet channels of said first claim 1 , second claim 1 , third and fourth distribution valve are respectively connected:to the first secondary enclosures of the first and second elementary motors;to the first secondary enclosure of the third elementary motor;to the second secondary enclosure of the first elementary motor;to the second secondary enclosures of the second and third elementary motors.3. The circuit according to claim 1 , comprising exactly four elementary motors claim 1 , and wherein said outlet channels of said first claim 1 , second claim 1 , third and fourth distribution valve are respectively connected:to the first secondary enclosures of the first and second elementary motors;to the first secondary enclosures of the third and fourth elementary motors;to the second secondary enclosures of the first and fourth elementary motors;to the second secondary enclosures of the second and third elementary motors.4. The circuit according to claim 1 , ...

Hydraulic Drive with Energy Recovery

A hydraulic drive device with energy recovery function, includes a pressure medium pump for supplying a consumer with pressure medium and a return line for removing the pressure medium from the consumer. The discharged pressure medium is returned under pressure to the suction side of the pressure medium pump. 1. A hydraulic drive device with an energy recovery function , comprising:a pressure medium pump for supplying at least one consumer with pressure medium; anda return line for discharging the pressure medium from the consumer,wherein the discharged pressure medium is returned under a predetermined or predeterminable recovery pressure to the suction side of the pressure medium pump.2. The hydraulic drive device as claimed in claim 1 , wherein the return line comes from the consumer and enters an intake line of the pressure medium pump.3. The hydraulic drive device as claimed in claim 2 , further comprising:a valve arranged in the intake line between the entry point of the return line and a pressure medium tank,wherein the valve is preferably a check valve, that only allows a flow of pressure medium from the tank to the pump.4. The hydraulic drive device as claimed in claim 2 , further comprising:a pressure compensator in the return line, which opens the return line when there is a predetermined or predeterminable discharge pressure and preferably when there is a predetermined or predeterminable pressure difference over an upstream throttle.5. The hydraulic drive device as claimed in claim 4 , further comprising:a pressure limiting valve, which is interposed in an overpressure line connected to the return line downstream from the pressure compensator and preloads the output side of the pressure compensator to the predetermined or predeterminable recovery pressure.6. The hydraulic drive device as claimed in claim 1 , further comprising:a pressure accumulator, which is charged by the volumetric recovery flow.7. The hydraulic drive device as claimed in claim 6 , ...

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.

Independent blade control system with hydraulic cyclic control

According to one embodiment, a radial fluid device includes a cylinder block having a plurality of radially extending cylinders, a plurality of pistons, and a cam disposed about the plurality of radially extending cylinders. A first linear control is coupled to the cam and operable to reposition the cam along a first axis. A second linear control is coupled to the cam and operable to reposition the cam along a second axis. A third linear control is coupled to the cam and operable to resist movement of the cam along a third axis.

Speed Regulator

The invention relates to a speed regulator of a bicycle, which speed regulator is in the rear hub or the pedal centre of the bicycle, which includes one or more hydraulic pumps which is rotated by a rear pinion or by the pedals, which hydraulic pump rotates one or more hydraulic motors, which hydraulic motor/hydraulic motors rotates/rotate the rear wheel of the bicycle. According to the invention, the rotation speed of the hydraulic pump can be steplessly changed when the rear pinion or the pedals rotate at constant speed. 1. A speed regulator of a bicycle , in whichspeed regulator is in the rear hub or the pedal centre of the bicycle, which includes one or more hydraulic pumps, which is (are) rotated by a rear pinion or by the pedals,the hydraulic pump rotates one or more hydraulic motors,hydraulic motor/hydraulic motors rotates/rotate the rear wheel of the bicycle, andthere are means for changing the rotation speed of the hydraulic motor steplessly when the rear pinion or the pedals rotate at constant speed.2. A speed regulator of a bicycle according to claim 1 , in whichthere are means for adjusting volumes of a pressure chamber and a return chamber of the hydraulic pump.3. A speed regulator of a bicycle according to claim 1 , in whichthere are means for changing a pumping power of the hydraulic motor steplessly when the rear pinion or the pedals rotate at constant speed.4. A speed regulator of a bicycle according to claim 3 , in whichthere are means for adjusting volumes of a pressure chamber and a return chamber of the hydraulic motor.5. A speed regulator of a bicycle according to claim 2 , in whichthere are means for changing a pumping power of the hydraulic motor steplessly when the rear pinion or the pedals rotate at constant speed;there are means for adjusting volumes of a pressure chamber and a return chamber of the hydraulic motor; andthe volumes of the chambers of the hydraulic pump and the hydraulic motor are adjustable by a speed controller.6. A speed ...

MULTIPLE FUNCTION HYDRAULIC SYSTEM WITH A VARIABLE DISPLACEMENT PUMP AND A HYDROSTATIC PUMP-MOTOR

A hydraulic system includes a first pump and a plurality of valves that control fluid flow from the first pump to several actuators. Variable source orifices in the control valves are connected in parallel between the first pump and a node, and variable bypass orifices in the control valves are connected in series between the node and a tank. Pressure at the node controls displacement of the first pump. Each control valve also has a metering orifice for varying fluid flow between the node and one of the actuators. A hydrostatic pump-motor, coupled between two ports of a given actuator, is driven in a motoring mode by fluid exiting one of those ports. In a pumping mode, the hydrostatic pump-motor forces lower pressure fluid exhausting from one port into the other port of the given actuator. 1. A hydraulic system for a machine comprising:a plurality of hydraulic actuators, including a given hydraulic actuator that has a cylinder and piston arrangement with a first port and a second port;a first pump for furnishing fluid for operating the plurality of hydraulic actuators;a tank for receiving fluid from the plurality of hydraulic actuators;a plurality of control valves, each of which selectively controls fluid flow between an associated one of the plurality of hydraulic actuators and both the first pump and the tank, the plurality of control valves including a given control valve having a first workport connected to the first port of the given hydraulic actuator and a second workport connected to the second port; anda hydrostatic pump-motor operatively connected to convey fluid between the first and second ports of the given hydraulic actuator, and having a motoring mode in which the hydrostatic pump-motor is driven by fluid flowing out of one of the first and second ports at a higher pressure than fluid flowing into the other one of the first and second ports, and having a pumping mode in which fluid is pumped by the hydrostatic pump-motor when fluid flowing out of one ...

Gerotor pump, a gerotor motor and a gerotor transmission system

A gerotor pump ( 1 ) comprising; a housing ( 2 ) which comprises a first and a second supply socket ( 18 a , 18 b; 19 a, 19 b ), an inner rotor ( 4 ); and an outer rotor ( 5 ) rotatably located relative the housing ( 2 ); wherein the inner rotor ( 4 ) is located within the outer rotor ( 5 ), and lobes ( 13, 4 ) of the inner and the outer rotor ( 4, 5 ) engaging, the inner rotor ( 4 ) is centred around an axis ( 15 b) which is eccentric from an axis of rotation ( 15 ) of said outer rotor ( 5 ), wherein a pressure chamber ( 7 ) with a high pressure and a low pressure section, is defined between the inner and outer rotor ( 4, ), characterised in, that the inner rotor ( 4 ) is rotatably arranged on a shaft cylinder ( 10 b ) which is fixed at one end of a central drive shaft ( 10 ) of the pump ( 1 ) and is centred about said rotational axis ( 15 b ), whereby said inner rotor ( 4 ) wanders in said outer rotor ( 5 ) when said central drive shaft ( 10 ) is turned, and wherein the inner rotor ( 4 ) is provided with radial supply conduits ( 9 ) extending from the pressure chambers ( 7 ) to the shaft cylinder ( 10 b ), and wherein said shaft cylinder ( 10 b ) is provided with at least a first and a second cylinder opening ( 16, 17 ), such that the first cylinder opening ( 16 ) is axially displaced relative the second cylinder opening ( 17 ), and said first opening ( 16 ) is arranged such that it is connected to said high pressure section, and said second cylinder opening ( 17 ) is arranged such that it is connected to said low pressure section.

Liquid lithium supply and regulation

Methods and systems for the production and delivery of lithium metal of high purity are provided. More particularly, methods and systems for lithium metal purification, delivery and deposition are provided. In at least one aspect, a liquid lithium delivery system is provided. The liquid lithium delivery system comprises a liquid lithium delivery module. The liquid lithium delivery system comprises a lithium storage region operable to store the liquid lithium, a pumping region operable to move liquid lithium through the lithium delivery, and a flow control region. The pumping region comprises an electromagnetic pump operable to move the liquid lithium using electromagnetism. The flow control region operable to control the flow of liquid lithium, comprising one or more valves operable to control the flow of the liquid lithium, wherein the pumping region is positioned downstream from the lithium storage region and upstream from the flow control region.

Mechanically Activated CAM Extension Cylinder

A brake actuator for a brake rigging in a railway brake system includes a brake cylinder; a piston rod disposed on the brake cylinder and connected to a piston assembly in the brake cylinder, the piston rod being configured to be moved by the piston assembly in a reciprocal axial motion and including at least one lateral protrusion extending therefrom; and an extension cylinder disposed on the brake cylinder at least partially surrounding the piston rod, the extension cylinder including at least one cam surface engaged by the at least one lateral protrusion of the piston rod. The extension cylinder is configured to be connected to a hand brake mechanism and to be actuated by the hand brake mechanism to rotate such that the cam surface engages the lateral protrusion of the piston rod to cause the piston rod to move to the extended position.

HYDRAULIC TOOLS WITH RAPID ADVANCE

Hydraulic tools having extendable rams for performing various functions such as crimping are described. The tools include a hydraulic system that enables the ram to be rapidly advanced. Methods using the hydraulic systems and tools are also described. 1. A hydraulic system comprising:a reservoir adapted to contain hydraulic fluid;a hydraulic cylinder defining a hollow interior and including a ram disposed therein, the ram defining a first face and an oppositely directed second working face, the interior of the cylinder and the first face of the ram defining a primary chamber, the ram positionable through a first phase of ram extension and a second phase of ram extension;a pushrod assembly including a housing defining a hollow interior and a pushrod positionably disposed therein, the pushrod defining a first end and an oppositely directed second end, the interior of the housing and the first end of the pushrod defining a secondary chamber, the pushrod and the ram being in at least periodic operable engagement such that extension of the pushrod causes extension of the ram;wherein the pushrod and housing include provisions to preclude fluid flow between the primary chamber and the secondary chamber when the pushrod is within a range of positions corresponding to the first phase of ram extension, and permit fluid flow between the primary chamber and the secondary chamber when the pushrod is within a range of positions corresponding to the second phase of ram extension.2. The hydraulic system of wherein the provisions include the pushrod defining a circumferential outer surface generally extending between the first end and the second end of the pushrod and a flat surface region extending along a length portion of the pushrod from the first end of the pushrod.3. The hydraulic system of wherein the provisions further include a recessed band extending around at least a portion of the circumference of the pushrod claim 2 , the recessed band located between the first end and ...

INITIALIZATION METHOD FOR ELECTRO-MECHANICAL BRAKE

An initialization method for an EMB may include: opening an in-valve for controlling a flow path through which brake oil is introduced from a master cylinder, closing an out-valve for controlling a flow path through which the brake oil is transferred to an accumulator part, and driving a motor to move a master piston forward; when the master piston is moved by a preset distance after coming in contact with a slave piston which is brought in contact with an inner pad, closing the in-valve and driving the motor to move the master piston backward; when the contact between the master piston and the slave piston is released, determining whether a gap between the master piston and the slave piston is equal to or more than a preset gap; and when the gap is equal to or more than the preset gap, ending initialization of the EMB. 1. An initialization method for an electro mechanical brake (EMB) , comprising:opening an in-valve for controlling a flow path through which brake oil is introduced from a master cylinder, closing an out-valve for controlling a flow path through which the brake oil is transferred to an accumulator part, and driving a motor to move a master piston forward;when the master piston is moved by a preset distance after coming in contact with a slave piston which is brought in contact with an inner pad for forming a braking force, closing the in-valve and driving the motor to move the master piston backward;when the contact between the master piston and the slave piston is released, determining whether a gap between the master piston and the slave piston is equal to or more than a preset gap; andwhen the gap is equal to or more than the preset gap, ending initialization of the EMB.2. The initialization method for claim 1 , wherein the determining of whether the gap between the master piston and the slave piston is equal to or more than the preset gap comprises:when it is determined that the gap is less than the preset gap, opening the out-valve, and driving ...

System to Pump Fluid and Control Thereof

A fluid system includes a variable-speed and/or a variable-torque pump to pump a fluid, at least one proportional control valve assembly, an actuator that is operated by the fluid to control a load, and a controller that establishes a speed and/or torque of the pump and a position of the at least one proportional control valve assembly. The pump includes at least one fluid driver that provides fluid to the actuator, which can be, e.g., a fluid-actuated cylinder, a fluid-driven motor or another type of fluid-driven actuator that controls a load. Each fluid driver includes a prime mover and a fluid displacement assembly. The fluid displacement assembly can be driven by the prime mover such that fluid is transferred from the inlet port to the outlet port of the pump. 130.-. (canceled)31. A hydraulic system comprising: at least one electric motor,', 'a gear assembly configured to be driven by the at least one electric motor such that fluid is transferred from an inlet port of the hydraulic pump to an outlet port of the hydraulic pump; and', 'a control valve disposed on a side of the inlet port or the outlet port, wherein the first control valve is configured to be throttled; and, 'a hydraulic pump to provide hydraulic fluid to a hydraulic actuator having first and second ports, the hydraulic pump including,'}a controller configured to operate the at least one electric motor to control a flow in the hydraulic system to a flow set point or a pressure in the hydraulic system to a pressure set point, the controller further configured to operate the control valve to control the flow in the hydraulic system to the flow set point or the pressure in the hydraulic system to the pressure set point.32. The hydraulic system of claim 31 , wherein the hydraulic system is a closed-loop system.33. The hydraulic system of claim 31 , wherein the control valve is throttleable between 0% and 100%.34. The hydraulic system of claim 31 , wherein the control valve is a ball valve.35. The ...

SERVO REGULATOR

A servo regulator includes a servo piston coupled with a swash plate, a pressure chamber provided to face an end portion of the servo piston, a spool configured to control a pressure in the pressure chamber by being moved by a solenoid, a biasing member configured to bias the spool against a thrust of the solenoid, and a feedback portion configured to change a biasing force of the biasing member in accordance with tilting of the swash plate, wherein the feedback portion is coupled with the swash plate via the servo piston. 1. A servo regulator for controlling tilting of a swash plate of a variable volume piston pump , comprising:a servo piston slidably accommodated in a case and coupled with the swash plate;a pressure chamber provided to face an end portion of the servo piston;a spool configured to control a pressure in the pressure chamber by being moved by a solenoid;a biasing member configured to bias the spool against a thrust of the solenoid; anda feedback portion configured to change a biasing force of the biasing member in accordance with the tilting of the swash plate, whereinthe feedback portion is coupled with the swash plate via the servo piston.2. The servo regulator according to claim 1 , whereinan outer peripheral surface of the servo piston is formed with an annular groove into which the feedback portion is inserted.3. The servo regulator according to claim 2 , whereinthe feedback portion extends in a tangent direction of the annular groove.4. The servo regulator according to claim 1 , wherein a first case member mounted on the variable volume piston pump, the first case being configured to accommodate the servo piston; and', 'a second case member mounted on the first case member, the second case member being configured to accommodate the spool and the biasing member., 'the case includes5. The servo regulator according to claim 4 , whereinthe feedback portion inserts an insertion hole formed in the second case member; andthe second case member is ...

CONNECTING AND DISCONNECTING DEVICE OF CLUTCH

A connecting and disconnecting device of a clutch includes a clutch pedal, a clutch cylinder, a depressing force transmission mechanism, and an actuator. The depressing force transmission mechanism includes a separation mechanism that connects and disconnects a depressing force transmission path of the depressing force transmission mechanism, the separation mechanism includes an input piston to which the depressing force from the clutch pedal is input, an output piston for outputting a clutch operating hydraulic pressure to the clutch cylinder, a first oil chamber provided between the input piston and the output piston, and an electromagnetic valve provided to make a connection or disconnection between the first oil chamber and a reservoir tank connected to the first oil chamber, and the actuator is connected to transmit power to the output piston of the separation mechanism. 1. A connecting and disconnecting device of a clutch , the connecting and disconnecting device comprising:a clutch pedal configured to be operated by a driver;a clutch cylinder;a depressing force transmission mechanism configured to transmit a depressing force, with which the clutch pedal is depressed, to the clutch cylinder; andan actuator configured to generate power for connecting and disconnecting the clutch through the depressing force transmission mechanism, wherein:the depressing force transmission mechanism includes a separation mechanism that connects and disconnects a depressing force transmission path of the depressing force transmission mechanism; an input piston to which the depressing force from the clutch pedal is input,', 'an output piston that outputs a clutch operating hydraulic pressure to the clutch cylinder,', 'a first oil chamber provided between the input piston and the output piston, and', 'an electromagnetic valve provided to make a connection or disconnection between the first oil chamber and a reservoir tank connected to the first oil chamber; and, 'the separation ...

MOBILE HYDRAULIC GENERATOR AND CONTROL METHOD THEREOF

Disclosed are a mobile hydraulic generator having rapid response by scattering a small motor for generating a flow of fluid and a small pump, and a control method thereof. The mobile hydraulic generator includes: a flow generator including n pumps operated by n motors to generate an amount of a hydraulic fluid; a proportional hydraulic control valve to control output hydraulic pressure according to the amount of the hydraulic fluid; a pressure sensor to detect the output hydraulic pressure; and a hydraulic servo loop controller to which required hydraulic pressure and required amount of fluid are input by a user, to which feedback the output hydraulic pressure, to generate a pressure control signal for controlling the proportional hydraulic control valve based on the required hydraulic pressure and a change amount of the output hydraulic pressure and to generate an RPM input signal for controlling RPM of the n motors. 1. A mobile hydraulic generator comprising:a flow generator including n pumps operated by n motors to generate an amount of a hydraulic fluid;a proportional hydraulic control valve to control output hydraulic pressure according to the amount of the hydraulic fluid;a pressure sensor to detect the output hydraulic pressure; and a hydraulic servo loop controller to generate a pressure control signal for controlling the proportional hydraulic control valve based on a required hydraulic pressure and a change amount of the output hydraulic pressure and to generate an RPM input signal for controlling RPM of the n motors, respectively,wherein the required hydraulic pressure and a required amount of fluid are input by a user, and the output hydraulic pressure is feedbacked to the hydraulic servo loop controller.2. The mobile hydraulic generator of claim 1 , wherein the pressure control signal is calculated by combining feedforward calculation which is based on the required hydraulic pressure and proportional calculation claim 1 , integral calculation claim 1 , ...

METHOD AND SYSTEM FOR THE HYDRAULIC CONTROL OF A CONCRETE PLACING BOOM

A method and system for the hydraulic control of a concrete placing boom () comprising a plurality of boom arms (), wherein hydraulic drive cylinders () for the boom arms (), which are connected to one another in an articulated manner, are controlled by a hydraulic circuit (), wherein a supply pressure is supplied via a hydraulic pump () to the hydraulic circuit (), and wherein a pressure signal is captured in the drive cylinders () by at least one pressure sensor () for each cylinder. The maximum pressure in the drive cylinders () is determined from the pressure signals and the supply pressure is adjusted by an electronic control unit () according to the maximum pressure. 1. A method for the hydraulic control of a concrete placing boom comprising:providing the concrete placing boom with a plurality of boom arms wherein the plurality of boom arms are connected to one another in an articulated manner and wherein hydraulic drive cylinders for the boom arms are controlled by a hydraulic circuit which includes a hydraulic pump;supplying a supply pressure to the hydraulic circuit with the hydraulic pump;providing at least one pressure sensor for each of the hydraulic drive cylinders and generating a pressure signal with each of the pressure sensors; andwherein the maximum pressure in the drive cylinders is determined from the pressure signals and the supply pressure is adjusted by an electronic control unit as a function of the maximum pressure.2. The method according to wherein the pressure signals are transmitted as electrical signals via electrical signal lines from the pressure sensors to the electronic control unit.3. The method according to wherein the pressure sensors sense pressure directly on the bottom side and/or the rod side of the drive cylinder.4. The method according to wherein the electrical signals are transmitted to a comparator of the control device formed by an electronic circuit or software.5. The method according to wherein the supply pressure is ...

Loop-flushing-system for hydrostatic apparatus

A hydraulic loop-flushing device ( 50 ) for a hydrostatic apparatus ( 1 ) comprising a valve housing ( 8 ) having a cylindrical valve bore ( 9 ) with a high pressure inlet ( 5 or 6 ), a low pressure inlet ( 6 or 5 ) and a discharge outlet ( 7 ). A first flushing valve spool ( 12 ) is arranged elastically pre-stressed within the valve bore ( 9 ) for enabling a fluid connection between the low pressure inlet ( 6 or 5 ) and the discharge outlet ( 7 ) by means of a first fluid channel ( 16 ). Further, a shuttle valve spool ( 22 ) is arranged elastically pre-stressed within the valve bore ( 9 ) for further enabling the fluid connection between the low pressure inlet ( 6 or 5 ) and the discharge outlet ( 7 ) by means of a fluid passageway ( 29 ). The first flushing valve spool ( 12 ) is moveable into an open position, in which the first fluid channel ( 16 ) is open, if the fluid pressure at the low pressure inlet ( 6 or 5 ) exceeds a first threshold value, and the shuttle valve spool ( 22 ) is moveable into an open position, in which the fluid passageway ( 29 ) is open for connecting the low pressure inlet ( 6 or 5 ) with the discharge outlet ( 7 ), if the pressure difference between the high pressure inlet ( 5 or 6 ) and the low pressure inlet ( 6 or 5 ) exceeds a second threshold value. For this the first flushing valve spool ( 12 ) and the shuttle valve spool ( 22 ) are arranged concentrically and moveable relative to each other, and the fluid connection between the low pressure inlet ( 6 or 5 ) and the discharge outlet ( 7 ) is enabled only, if both the first flushing valve spool ( 12 ) and the shuttle valve spool ( 22 ) are in the respective open positions.

Construction Machine

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

Method for operating a hydraulic system and brake system

A method for operating a hydraulic system with a plurality of consumers an electrically controllable pressure supply device and an electrically actuable inlet valve, per consumer, which inlet valve is arranged between the pressure supply device and the consumer, wherein a pressure/volume relationship is predefined or determined for each consumer, wherein each consumer is assigned to a first group or a second group of consumers, wherein the first group of consumers includes at least one consumer, and wherein, in order to set predefined consumer-specific setpoint pressures, the first group of consumers is connected via the respectively opened inlet valve to the pressure supply device, and the inlet valves of the consumers of the second group are closed, wherein the inlet valve of a single, selected consumer of the second group is opened while being regulated to build up a pressure, and a brake system for motor vehicles.

POWER GENERATION SYSTEM

A power generation system to improve the degree of freedom of installation is described herein. A power generation system comprises: first fluid chambers that contain a fluid; a second fluid chamber that contains the fluid; a communication flow channel that communicates the first fluid chambers and the second fluid chamber with each other; first pistons that are disposed such that the fluid in the first fluid chambers can be pressed; a second piston that is disposed such that the fluid in the second fluid chamber can be pressed; and power generation modules that convert pressing forces of the corresponding first pistons into electricity using piezoelectric elements. The power generation elements of the power generation modules generate power when the second piston is pressed, and the pressing force is transmitted to the first pistons via the fluid, and the piezoelectric elements are indirectly pressed due to the force thus transmitted. 1. A power generation system comprising:a fluid container that contains a fluid;a first piston disposed in the fluid container to press the fluid in the fluid container;a second piston disposed in the fluid container to press the fluid in the fluid container; anda power generation module comprising a power generation element; whereinwhen the second piston is pressed by a pressing force, the pressing force is transmitted to the first piston via the fluid in the fluid container, and the first piston presses the power generation element directly or indirectly due to the force thus transmitted to generate power.2. The power generation system according to claim 1 , wherein the fluid container comprises:a first fluid chamber;a second fluid chamber; anda communication flow channel fluidly communicating the first fluid chamber and the second fluid chamber, whereinthe first piston is disposed to press fluid in the first fluid chamber, andthe second piston is disposed to press fluid in the second fluid chamber.3. The power generation system ...

Hybrid construction machine

A hybrid construction machine includes first and second main pumps, first and second supply passages, first and second circuit systems, a hydraulic motor, a motor generator, an assist pump, a joint passage connected to the assist pump and branched off, first and second logic valves, a switching valve disposed in the other branch passage and switchable to a state where the assist pump is connected to the second supply passage on the upstream side of the second logic valve and a state where the second main pump is connected to the hydraulic motor, and a check valve. A poppet diameter of the first logic valve is smaller than that of the second logic valve.

Power transfer device, orbital pipe cutting device and hydraulic chucking device

Disclosed are a power transfer device for transferring external power to a rotary body, a pipe cutting device using the power transfer device and a hydraulic chucking device using the power transfer device. The power transfer device is configured to transfer external power to a rotary body coupled to one side of a main body. The power transfer device includes at least one double-action interlocking cylinder mounted to a rear surface of the rotary body and provided with a rod protruding toward the main body, a push unit installed in the main body and provided with at least one pusher protruding toward the rotary body, and a bearing disposed between the pusher of the push unit and the rod of the interlocking cylinder and configured to allow relative rotation of the pusher and the rod and to transfer power between the pusher and the rod.

SERVO HYDRAULIC PRESS

The present invention relates to a servo hydraulic press for sheet metal forming. The press comprises a hydraulic cylinder, at least two servo motors and at least two pumps for supplying pressurized fluid to the hydraulic cylinder, where each servo motor drives at least one pump. The servo motors are operable at variable speed, and the first servo motor and first pump are operable in an opposite direction to the second servo motor and the second pump. With this arrangement, the servo hydraulic press may be operated at low speed without causing damage to the pumps or motors. 2143. The servo hydraulic press () according to claim 1 , wherein each servo motor () and/or pump () is operable in two directions.31. The servo hydraulic press () according to claim 1 , wherein the supply of pressurized fluid is a closed loop supply.414. The servo hydraulic press () according to claim 1 , wherein the servo motors () are reluctance motors.512. The servo hydraulic press () according to claim 1 , further comprising at least one control valve ().612. The servo hydraulic press () according to claim 1 , wherein the at least one control valve () is manually operated.712. The servo hydraulic press () according to claim 1 , wherein the at least one control valve () is automatically operated.81. A method for controlling a hydraulic cylinder in a servo hydraulic press () for forming sheet metal claim 1 , the method comprising the steps of{'b': 3', '4, 'supplying pressurized fluid to the hydraulic cylinder by means of at least two pumps (), each driven by a respective servo motor (),'}operating the servo motors at variable speed, andoperating at least one first servo motor and at least one first pump in an opposite direction to at least one second servo motor and at least one second pump.92. The method according to claim 8 , further comprising the step of controlling the flow of the fluid by use of at least one control valve ().102. The method according to claim 8 , wherein the step of ...

FLUID DELIVERY SYSTEMS INCLUDING HYDRAULIC DRIVE SYSTEMS

A hydraulic drive system includes a unidirectional pump, a charge pump configured to supply an input of the unidirectional pump with a hydraulic fluid pressurized with a charge pressure, a hydraulic motor, and a flow control valve configured to meter a flow of hydraulic fluid from an output of the unidirectional pump to a fluid input of the hydraulic motor. The hydraulic motor comprises a fluid output configured to be in direct fluid communication with the input of the unidirectional pump. Fluid delivery systems include hydraulic drive systems. 1. A hydraulic drive system , comprising:a unidirectional pump;a charge pump configured to supply an input of the unidirectional pump with a hydraulic fluid pressurized with a charge pressure;a hydraulic motor with an output shaft;a flow control valve configured to meter a flow of hydraulic fluid from an output of the unidirectional pump to a fluid input of the hydraulic motor; anda fluid delivery pump mechanically coupled to the output shaft of the hydraulic motor;wherein the hydraulic motor comprises a fluid output configured to be in direct fluid communication with the input of the unidirectional pump.2. The hydraulic drive system of claim 1 , wherein the drive system further comprises a fluid reservoir claim 1 , and wherein the charge pump is configured to draw hydraulic fluid from the fluid reservoir.3. The hydraulic drive system of claim 2 , wherein the drive system further comprises a heat exchanger configured to extract heat from the hydraulic fluid.4. The hydraulic drive system of claim 3 , wherein the heat exchanger is configured for fluid communication with the output of the unidirectional pump and the reservoir.5. The hydraulic drive system of claim 2 , wherein at least one of the charge pump claim 2 , the unidirectional pump claim 2 , and the hydraulic motor comprise a relief valve configured to be in fluid communication with the reservoir.6. The hydraulic drive system of claim 1 , wherein the flow control valve ...

Hydraulic Actuating Device for Actuation of at Least One Friction Clutch and at Least One Gear Setting Element in a Motor Vehicle

A hydraulic actuating device for a friction clutch and a gear setting element has a power unit for pressure generation by use of an electrically driven pump. Gear setting and clutch actuating sections are hydraulically connected to the power unit. A detenting device with a blocking element is associated with a piston of the clutch setting cylinder, which is operatively connected with the friction clutch and can be hydraulically loaded on opposite sides. The blocking element is resiliently biased into a blocking setting preventing piston movement and is movable by an actuator from the blocking setting into a release setting permitting piston movement. The pump is reversible in order to load the piston on one or the other side for an actuating movement. The control unit coordinates activation of the pump and actuator in order to disengage or engage the friction clutch.

MAGNETIC RESONANCE IMAGING COMPATIBLE SYSTEM FOR IMPARTING MOTION

A system for imparting motion of an object includes: (1) at least one first hydrostatic actuator; (2) a hydraulic transmission conduit; and (3) at least one second hydrostatic actuator. The first hydrostatic actuator is connected to the second hydrostatic actuator via the hydraulic transmission conduit, such that an input displacement applied to the first hydrostatic actuator is transmitted via the hydraulic transmission conduit to the second hydrostatic actuator to impart motion of the object. 1. A system for imparting motion of an object , comprising:at least one first hydrostatic actuator;a hydraulic transmission conduit; andat least one second hydrostatic actuator,wherein the first hydrostatic actuator is connected to the second hydrostatic actuator via the hydraulic transmission conduit, such that an input displacement applied to the first hydrostatic actuator is configured to be transmitted via the hydraulic transmission conduit to the second hydrostatic actuator to impart motion of the object.2. The system of claim 1 , wherein at least one of the first hydrostatic actuator or the second hydrostatic actuator has a material composition that is entirely polymeric.3. The system of claim 1 , wherein at least one of the first hydrostatic actuator or the second hydrostatic actuator is devoid of a metal.4. The system of claim 1 , wherein at least one of the first hydrostatic actuator or the second hydrostatic actuator is devoid of a ferromagnetic material.5. The system of claim 1 , wherein the first hydrostatic actuator is a first rolling diaphragm actuator.6. The system of claim 5 , wherein the first rolling diaphragm actuator includes an actuator body claim 5 , a piston moveably disposed within the actuator body claim 5 , and a pair of diaphragms extending between respective portions of the actuator body and respective ends of the piston.7. The system of claim 6 , wherein the actuator body defines a slot claim 6 , and the first rolling diaphragm actuator further ...

Active Damper System for a Vehicle

An active damper system is provided for a vehicle, in particular a motor vehicle. It includes a damper unit with a cylinder, a piston which is guided in the cylinder, and a piston rod which is connected to the piston. The piston divides the cylinder into a first chamber and a second chamber, and the damper unit is designed to be arranged between a body and a wheel of the vehicle. The damper system also has a pump for changing the pressure in the two chambers and for moving the piston, a first valve, a second valve, which is connected to the first valve in series, a third valve, and a fourth valve, which is connected to the third valve in series. The first and second valve are connected in parallel to the third and fourth valve. A fluid-conductive first line leads to the first chamber between the first valve and the second valve, and a fluid-conductive second line leads to the second chamber between the third valve and the fourth valve. A low-pressure side of the pump is connected between the first valve and the fourth valve, and a pressure side of the pump is connected between the second valve and the third valve. The first valve, the second valve, the third valve, and the fourth valve can be switched in order to selectively block and release the flow of fluid. A control unit is provided for switching the four valves such that the pump rotates in the same direction when compressing and rebounding during an electromotor operation and a generator operation. 1. An active damper system for a vehicle , comprising:a damper unit having a cylinder, a piston which is guided in the cylinder, and a piston rod which is connected to the piston, the piston dividing the cylinder into a first chamber and a second chamber, and the damper unit being configured for arranging between a vehicle body and a wheel of the vehicle;a pump for changing pressures in the first and second chambers and for moving the piston;a first valve and a second valve which is connected in series with the ...

HYDRAULIC ACTUATOR

A hydraulic actuator includes a hollow tube that has a first opening at a first end of the hollow tube and that has a second opening at a second end of the hollow tube. The hollow tube contains hydraulic fluid. A moveable magnet moves within hollow tube as a result of a magnetic field within the hollow tube. A magnetic field source located outside the hollow tube creates the magnetic field within the hollow tube. When the moveable magnet moves to the first end of the hollow tube, a first piston pushes hydraulic fluid out of the first opening. When the moveable magnet moves to the second end of the hollow tube a second piston pushes hydraulic fluid out of the second opening. 1. A hydraulic actuator comprising:a hollow tube, having a first opening at a first end of the hollow tube and having a second opening at a second end of the hollow tube;hydraulic fluid within the hollow tube;a magnet within the hollow tube;a first piston on a first end of the magnet wherein when the magnet moves toward the first end of the hollow tube the first piston pushes hydraulic fluid out of the first opening;a second piston on a second end of the magnet wherein when the magnet moves toward the second end of the hollow tube the second piston pushes hydraulic fluid out of the second opening; and a plurality of sets of wire windings around the hollow tube, and', 'a control circuit that is separately connected to each set of wire windings allowing the control circuit to separately control current through each set of wire windings, the current through each set of wire windings creating a magnetic field that exerts a motional electromotive force on the magnet controlling movement and location of the magnet within the hollow tube so that in response to a positioning command, the control circuit separately controls current through each set of wire windings to bring the magnet to a selected position between the first end of the hollow tube and the second end of the hollow tube., 'a positioning ...

Device and method for maintaining a produced hydraulic pressure

A device for maintaining a hydraulic pressure, which can be set by a pressure generator, including: an inlet for coupling to the pressure generator; an outlet for providing the hydraulic pressure; at least a first check valve, which is configured to open a flow path from the inlet to the outlet when a first opening pressure is exceeded and to prevent flow in the opposite direction; and a switching apparatus between the inlet and the outlet, wherein the switching apparatus is configured to hold the hydraulic pressure at the outlet if a pressure produced by the pressure generator is greater than a switching pressure, and to reduce the hydraulic pressure at the outlet if a pressure produced by the pressure generator is less than the switching pressure, wherein the switching pressure is less than the first opening pressure. Also described are a hydraulic system, a power-steering system, vehicle, and method.

Work Machine

To provide a work machine which, in a configuration provided with a closed-circuit pump and an open-circuit pump, is capable of stabilizing respective pump operations of the closed-circuit pump and the open-circuit pump and of improving the mountability of the closed-circuit pump and the open-circuit pump. The present invention is provided with a closed circuit in which a closed-circuit pump and a boom cylinder are connected annularly, and an open circuit which has an open-circuit pump for making hydraulic fluid flow in from a reservoir and flow out and a connection passage capable of introducing hydraulic fluid into the closed circuit, wherein the closed-circuit pump is installed above the open-circuit pump.

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

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

PNEUMATIC PRESSURE BRAKE BOOSTER SYSTEM AND METHOD

A pneumatic pressure brake booster system includes an air pressure chamber; an ambient air chamber; a flexible diaphragm separating the air pressure chamber and the ambient air chamber; at least one air pressure source communicating with the air pressure chamber; a brake pedal shaft engaged by and movable with the diaphragm; and a brake master cylinder engaged by the brake pedal shaft. 1. A pneumatic pressure brake booster system , comprising:an air pressure chamber;an ambient air chamber;a flexible diaphragm separating the air pressure chamber and the ambient air chamber;at least one air pressure source communicating with the air pressure chamber;a brake pedal shaft engaged by and movable with the diaphragm; anda brake master cylinder engaged by the brake pedal shaft.2. The system of wherein the at least one air pressure source comprises engine intake air.3. The system of wherein the at least one air pressure source comprises an auxiliary pressure pump.4. The system of further comprising a hose coupling detachably coupling the auxiliary pressure pump to the air pressure chamber.5. The system of further comprising at least one ambient air vent communicating with the ambient air chamber.6. The system of wherein the at least one ambient air vent comprises a plurality of ambient air vents.7. The system of wherein the at least one air pressure source communicating with the air pressure chamber comprises a plurality of air pressure sources communicating with the air pressure chamber.8. The system of wherein the plurality of air pressure sources communicating with the air pressure chamber comprises engine intake air and an auxiliary pressure pump communicating with the air pressure chamber.9. A pneumatic pressure brake booster system claim 7 , comprising:a booster shell having a brake pedal side and a brake master cylinder side;an air pressure chamber in the booster shell on the brake pedal side;an ambient air chamber in the booster shell on the brake master cylinder side ...

Self-contained fluid-power servomechanism

An example method of using a servomechanism can include controlling a reversible positive displacement pump that is located in a first chamber of a housing to push a fluid, via a first passage in the housing, against one side of a vane that is rotably disposed in a second chamber of a housing to rotate an output shaft that is coupled to the vane and controlling the reversible positive displacement pump to push a fluid, via a second passage in the housing, against another side of a vane to reverse rotation of the output shaft.

Method for controlling pressure in a hydraulic actuator

In conventional load-sense systems, there is a delay between a hydraulic function being impeded by an external force and further motion of the function. This is typically due to cavitation on the low pressure side of the pump. Electro-hydraulic systems, however, typically respond very quickly because the low pressure side of the pump may be pressurized because the low-pressure side of the actuator may feed directly to the pump rather than going to tank. Thus, an operator cannot as easily rely on feedback for when a function has encountered an external load. This may result in loss of vehicle traction or other drawbacks. Therefore, provided is a system and method for mimicking a load-sense system's responsiveness using an electro-hydrostatic system via an induced passive or active time-delay.

SYSTEMS AND METHODS FOR MANAGING NOISE IN COMPACT HIGH SPEED AND HIGH FORCE HYDRAULIC ACTUATORS

Presented herein are systems and methods for attenuating certain pulsations in a hydraulic system comprising a pump and a hydraulic actuator. In certain aspects, an accumulator comprising an internal volume that is divided into a working chamber and a contained chamber may be utilized to at least partially attenuate propagation of certain pulsations in the system. The working chamber may be fluidically coupled to the pump via a first flow path and fluidically coupled to a chamber of the actuator via a second flow path. The system may be designed such that a first inertance of the first flow path is greater than a second inertance of the second flow path. Additionally or alternatively, the system may be designed such that a resonance associated with the first inertance and a compliance of the accumulator may occur at a resonance frequency of less than 90 Hz. 120-. (canceled)21. A hydraulic apparatus comprising:a hydraulic actuator comprising an actuator housing that at least partially defines a compression chamber and an extension chamber;a pump; the first working chamber is fluidically coupled to the pump by a compression-side first flow path having a first inertance;', 'the first working chamber is fluidically coupled to the compression chamber by a compression-side second flow path having a second inertance; and', 'the first inertance is larger than the second inertance., 'a compression-side accumulator housing defining a first internal volume that is divided, by a first barrier, into a first contained chamber and a first working chamber, wherein, 'a compression-side accumulator comprising22. The hydraulic apparatus of claim 21 , wherein a first TFmag of a first transfer function has at least one of a first global maximum or first local maximum at a first frequency claim 21 , and a second TFmag of a second transfer function has at least one of a second global maximum or second local maximum at a second frequency claim 21 , wherein:the second frequency is higher ...

SEMI-CLOSED LOOP HYDRAULIC SYSTEM FOR MATERIAL APPLICATION MACHINES

A semi-closed loop hydraulic circuit includes a prime move, a first hydraulic circuit operatively coupled to the prime mover, and a second hydraulic circuit operatively coupled to the prime mover. The second hydraulic circuit is fluidly coupled to the first hydraulic circuit. 1. A semi-closed loop hydraulic system comprising:a prime mover;a first hydraulic circuit operatively coupled to the prime mover; anda second hydraulic circuit operatively coupled to the prime mover, wherein the second hydraulic circuit is fluidly coupled to the first hydraulic circuit.2. The semi-closed loop hydraulic system of claim 1 , wherein the first hydraulic circuit comprises:a first hydraulic pump operatively coupled to the prime mover; anda driven actuator fluidly coupled to the first hydraulic pump.3. The semi-closed loop hydraulic system claim 2 , of claim 2 , wherein the second hydraulic circuit comprises:a working fluid reservoir; anda second hydraulic pump fluidly coupled to the working fluid reservoir and operatively coupled to the prime mover.4. The semi-closed loop hydraulic system of claim 2 , wherein a first fluid flow path of the first hydraulic circuit and a second fluid flow path of the second hydraulic circuit combine into a combined fluid flow path at a position downstream of the driven actuator.5. The semi-closed loop hydraulic system of claim 4 , wherein the combined fluid flow path is directed toward a check valve claim 4 , wherein fluid flow having a pressure greater than a predetermined pressure is directed into the second hydraulic circuit and a remaining working fluid is directed toward an inlet of the first hydraulic pump.6. A material application machine comprising:a reservoir;a discharge pipe fluidly coupled to the reservoir; and a prime mover;', 'a first hydraulic circuit operatively coupled to the prime mover; and', 'a second hydraulic circuit operatively coupled to the prime mover, wherein the second hydraulic circuit is fluidly coupled to the first ...

Electrohydrostatic actution system, hydraulic circuit of electrohydrostatic actution system, and steam turbine system including same

Provided is an electrohydrostatic actuation system including an emergency shut-off circuit to be actuated stably with a simple configuration. The electrohydrostatic actuation system includes: a hydraulic cylinder ( 24 ) including a piston ( 25 ) to which a valve element is connected, a first chamber ( 24 A), and a second chamber ( 24 B); a hydraulic pump ( 21 ) configured to supply hydraulic fluid to the first chamber ( 24 A) or the second chamber ( 24 B); a servo motor (M) configured to drive the hydraulic pump ( 21 ); a shuttle valve ( 11 ) configured to establish communication to a downstream side under a state in which a hydraulic pressure generated by the hydraulic pump ( 21 ) is maintained; a solenoid valve ( 12 ) configured to receive the hydraulic pressure via the shuttle valve ( 11 ) as a pilot pressure; and a logic valve ( 13 ) including a first port configured to receive the pilot pressure from the solenoid valve ( 12 ), and a second port to be communicated to the first chamber ( 24 A) of the hydraulic cylinder ( 24 ). When the solenoid valve ( 12 ) is brought to a de-energized state, the pilot pressure of the logic valve ( 13 ) is released, and the logic valve ( 13 ) causes the hydraulic fluid in the first chamber ( 24 A) communicated to the second port to flow into the second chamber ( 24 B) so that emergency shut-off of the valve element is achieved by a return spring ( 26 ).

HYDRAULIC POWER SYSTEM AND METHOD FOR CONTROLLING SAME

A system and method is provided for monitoring a hydraulic power system having at least one light emitter and a button. The method includes powering on the hydraulic power system, receiving an actuation at the button and detecting a release of the button after a first time interval, and entering a diagnostic state. The method further includes retrieving a code and displaying the code by turning on the emitter in a first pattern. In some embodiments, a system and method is provided for regulating a temperature of a hydraulic power system. In some embodiments, a system and method is provided for controlling operation of a hydraulic torque wrench. 1. A method for monitoring a hydraulic power system , the hydraulic power system including at least one light emitter and a button , the method comprising:receiving an actuation at the button;detecting a release of the button after a first time interval and entering a diagnostic state;retrieving a code; anddisplaying the code by turning on the emitter in a first pattern.2. The method of claim 1 , wherein the code is a first code claim 1 , and wherein the method further comprises:retrieving a second code;subsequent to displaying the first code, displaying a delay sequence using the emitter; andsubsequent to displaying the delay sequence, displaying a second code by turning on the emitter in a second pattern.3. The method of claim 1 , further comprising providing a first vibrational pattern corresponding to the first pattern.4. The method of claim 1 , further comprising:subsequent to detecting a release, receiving an actuation at and detecting a release of the button, and entering a diagnostic sub-state;retrieving a life cycle code; anddisplaying the life cycle code by turning on the emitter in a third pattern.5. The method of claim 4 , wherein the life cycle code is an integer value claim 4 , and wherein displaying the life cycle code includes displaying the life cycle code in scientific notation claim 4 , includingflashing ...

Flow control valve having a motion conversion device

A motion conversion device is disclosed for converting motion in one direction into motion in another direction. The motion conversion device may include a single-acting cylinder hydraulically or pneumatically coupled to a double-acting cylinder such that movement of the single-acting cylinder along an axis causes movement of the double-acting cylinder along a non-parallel axis. The single-acting cylinder may be mechanically coupled to another single-acting cylinder such that movement of one of the single-acting cylinders in a direction causes movement of the other one of the single-acting cylinders in an opposite direction. In this way, the single-acting cylinders may cooperate to provide reciprocal motion of the double-acting cylinder. Also disclosed is a valve incorporating a motion conversion device for the purpose of moving a closure member between an open position and a closed position. Furthermore, a method for operating a valve closure member with a motion conversion device is disclosed.

Hydraulic valve and system

An apparatus includes a hydraulic circuit that is configured to selectively open fluid communication between one portion of the hydraulic circuit and another portion of the hydraulic circuit, such as a reservoir, based on the flow of the hydraulic fluid in the one portion. When the flow of hydraulic fluid exceeds a selected threshold in the one portion of the hydraulic circuit, the flow of fluid urges the opening of a hydraulic component of the hydraulic circuit to allow fluid communication between the one portion and the reservoir to discharge fluid from the one portion.

Apparatus and method for supplying fuel to engine of ship

Disclosed herein are an apparatus and a method for supplying a fuel to an engine of a ship. The apparatus for supplying a fuel to an engine of a ship includes: a high pressure pump pressurizing a liquefied natural gas (LNG) and supplying the pressurized LNG to the engine; a hydraulic motor driving the high pressure pump; and a lubricating pump supplying lubricating oil to the high pressure pump.

A hydraulic or pneumatic drive system, and a motor and a pump therefor

Hydraulic and pneumatic drive systems and fluid motors ( 12 ) and fluid pumps ( 10 ) therefor are disclosed. In such systems, rotation motion is converted to reciprocating motion or vice versa. In particular, a motion conversion means comprises a portion extending continuously and circumferentially around a central axis and extending in part longitudinally relative to the central axis, and a linking means, wherein the portion and the linking means are relatively rotatable about the central axis and a one of the linking means and the portion is fixedly coupled to a piston means, wherein the linking means and the portion are configured to cooperate whereby the reciprocating movement of the piston means causes relative rotary motion of the other of the portion and the linking means about said central axis. The other of the portion and the linking means may be coupled to a sleeve means to cause rotation thereof.

ANTI-STALL HYDRAULIC PUMP FOR A THRUST VECTOR CONTROL SYSTEM

A thrust vector control system is provided. The thrust vector control system may comprise an anti-stall hydraulic pump configured to deliver hydraulic fluid to at least one actuator, wherein each actuator may be configured to move an exhaust nozzle of a space vehicle. The anti-stall hydraulic pump may provide thermal conditioning to the thrust vector actuation control system during ground operation and/or periods of low output operation. 1. A thrust vector control system , comprising:a yaw actuator;a pitch actuator; and a swash plate configured to vary a displacement of the anti-stall hydraulic pump; and', 'an override piston configured to increase a force against the swash plate to decrease the displacement of the anti-stall hydraulic pump., 'an anti-stall hydraulic pump configured to provide a hydraulic fluid to the yaw actuator and the pitch actuator, the anti-stall hydraulic pump comprising2. The thrust vector control system of claim 1 , wherein the anti-stall hydraulic pump comprises a gerotor pump.3. The thrust vector control system of claim 2 , further comprising an anti-stall valve configured to monitor an output pressure of hydraulic fluid discharged from the gerotor pump claim 2 , wherein the anti-stall valve is in fluid communication with the override piston.4. The thrust vector control system of claim 3 , wherein in response to the output pressure of hydraulic fluid decreasing to a preset speed threshold claim 3 , the anti-stall valve moves to an open position to allow a flow of hydraulic fluid to the override piston.5. The thrust vector control system of claim 1 , further comprising a TVCS controller configured to transmit a nozzle actuator activation signal to the yaw actuator and the pitch actuator.6. The thrust vector control system of claim 5 , wherein the TVC pitch actuator comprises a TVC pitch actuator position sensor and the TVC yaw actuator comprises a TVC yaw actuator position sensor.7. The thrust vector control system of claim 6 , wherein the ...

Method And Apparatus For Providing Internal Heating Of Footwear

A method and apparatus for generating thermal energy (heat) from human locomotion is proposed and used to provide heating of the user's footwear. The apparatus takes the form of a pair of flexible, liquid-filled chambers connected by an energy-generating tube. One chamber is located in the heel region of a footwear insole, with the other in the toe region, such that as a person walks, the liquid moves back and forth within the tube. This movement is used to also move an energy-producing element (either an electromagnetic arrangement or viscous liquid) back and forth within the tube and convert the captured human locomotion energy into thermal energy, thus warming the footwear.

Electro-Hydraulic Actuator

Embodiments of the invention provide an electro-hydraulic actuator including an electric linear actuator, a double chamber hydraulic cylinder, and a hydraulic actuator. The double chamber hydraulic cylinder includes a double chamber piston coupled to the electric linear actuator and defining a first double chamber volume and a second double chamber volume. The hydraulic actuator includes a hydraulic actuator housing, a first rack piston, a second rack piston, a rack arranged between the first rack piston and the second rack piston, and a pinion engaged with the rack. A first hydraulic actuator volume is defined between the hydraulic actuator housing and the first rack piston in communication with the first double chamber volume, and a second hydraulic actuator volume is defined between the hydraulic actuator housing and the second rack piston in communication with the second double chamber volume.

Hydraulic actuator implemented robotic joint

A robotic joint that includes a hydraulic actuator. The hydraulic actuator includes a hollow tube that has a first opening at a first end of the hollow tube and that has a second opening at a second end of the hollow tube. The hollow tube contains hydraulic fluid. A moveable magnet moves within hollow tube as a result of a magnetic field within the hollow tube. A magnetic field source located outside the hollow tube creates the magnetic field within the hollow tube. When the moveable magnet moves to the first end of the hollow tube, a first piston pushes hydraulic fluid out of the first opening. When the moveable magnet moves to the second end of the hollow tube a second piston pushes hydraulic fluid out of the second opening.

CONTROL DEVICE AND CONTROL METHOD FOR LOADING MACHINE

A movement processing unit generates a work equipment operation signal for moving a bucket to a loading point and a swing operation signal related to a target swing speed, based on a command for starting an automatic movement of the bucket. A target speed changing unit changes the target swing speed so that the work equipment does not interfere with the loading target during a swing of a swing body. 1. A control device for controlling a loading machine including a swing body that swings about a swing center and work equipment that is attached to the swing body and has a bucket , the control device comprising: a work equipment operation signal in order to move the bucket to a loading point, and', 'a swing operation signal related to a target swing speed,', 'the work equipment operation signal and the swing operation signal being generated based on a command for starting a moving operation in order to move the bucket to the loading point without an operation of an operator; and, 'a movement processing unit configured to generate'}a target speed changing unit configured to change the target swing speed so that the work equipment does not interfere with the loading target during a swing of the swing body.2. The control device according to claim 1 , further comprising:an interference determination unit configured to determine whether or not the work equipment interferes with the loading target by the swing operation signal during swinging of the swing body,when the interference determination unit determines that the work equipment interferes with the loading target, the target speed changing unit changing the target swing speed.3. The control device according to claim 1 , wherein a height of the work equipment reaches a position higher than the loading target and', 'a swing angle until a planar position from above the work equipment interferes with the loading target., 'the target speed changing unit changes the target swing speed based on a time until'}4. The control ...

WORK MACHINE

Provided is a load sensing system for controlling a discharge pressure of the hydraulic pump so as to render a differential pressure obtained by subtracting a maximum load pressure among the hydraulic actuators from a discharge pressure of the hydraulic pump to be a constant pressure, and there are provided: a first load pressure flow passage which introduces load pressures of the hydraulic actuators to be outputted to a PLS transmission line which transmits the maximum load pressure among the hydraulic actuators at the time of activating the hydraulic actuators; and a second load pressure flow passage which is a flow path for introducing the load pressures of the hydraulic actuators to be outputted to the PLS transmission line during operation after activations of the hydraulic actuators, and wherein a flow rate of the pressure oil therein is reduced than that in the first load pressure flow passage. 1. A working machine comprising:a plurality of hydraulic actuators;a variable displacement hydraulic pump for supplying pressure oil to these hydraulic actuators; anda load sensing system for controlling a discharge pressure of the hydraulic pump so as to render a differential pressure obtained by subtracting a maximum load pressure among the hydraulic actuators from a discharge pressure of the hydraulic pump to be a constant pressure, whereinthe working machine is provided with: a first load pressure flow passage which introduces load pressures of the hydraulic actuators to be outputted to a PLS transmission line which transmits the maximum load pressure among the hydraulic actuators at the time of activating the hydraulic actuators; and{'b': '44', 'a second load pressure flow passage which is a flow path for introducing the load pressures of the hydraulic actuators to be outputted to said PLS transmission line () during operation after activations of the hydraulic actuators, and wherein a flow rate of the pressure oil therein is reduced than that in said first load ...

Hydraulic system

The present application is directed to a system for converting linear motion to rotary motion. The system includes at least first and second cylinders. The first and second cylinders are in fluid communication with each other. The system also includes a first piston. The first piston is slidably disposed in the first cylinder. The system further includes a second piston. The second piston is slidably disposed in the second cylinder. The first and second cylinders contain an incompressible fluid. The first piston is in operative connection with the second piston such that movement of the first piston in a first direction causes movement of the second piston in a second direction, wherein the second direction is opposite the first direction.

Hydraulic Control Block and Hydraulic Spindle Comprising said Control Block

The disclosure relates to a hydraulic control block for controlling a pressure medium supply of a hydraulic cylinder of a hydraulic spindle. The hydraulic control block includes a generic hydraulic switching structure electively configurable in each of a plurality of specific hydraulic switching structures, each of the plurality of specific hydraulic switching structures having a respective hydraulic cylinder with a number of piston areas which differs from a number of piston areas in the respective hydraulic cylinders of each of the other of the plurality of specific hydraulic switching structures. 1. A hydraulic control block for controlling a pressure medium supply of a hydraulic cylinder of a hydraulic spindle , comprising:a generic hydraulic switching structure electively configurable in each of a plurality of specific hydraulic switching structures, each of the plurality of specific hydraulic switching structures having a respective hydraulic cylinder with a number of piston areas which differs from a number of piston areas in the respective hydraulic cylinders of each of the other of the plurality of specific hydraulic switching structures.2. The control block as claimed in claim 1 , further comprising:a releasably arrangeable closure means configured to electively close at least a portion of a flow path configured in the control block, thereby electively configuring the generic hydraulic switching structure in one of the plurality of specific hydraulic switching structures.3. The control block as claimed in claim 2 , wherein the closure means is releasably arrangeable from outside the control block.4. The control block as claimed in claim 1 , further comprising:a first and a second supply interface, wherein the first supply interface is configured to be electively fluidically connected to at least one of a high-pressure side of a hydraulic machine of the spindle and a low-pressure side of the hydraulic machine, and the second supply interface is configured ...

Radial fluid device with multi-harmonic output

According to one embodiment, a radial fluid device comprises a cylinder block, first and second pluralities of pistons, a first cam disposed about the first plurality of radially extending cylinders, and a second cam disposed about the second plurality of radially extending cylinders. The second cam has at least one more lobe than the first cam.

Actuator device and control method

A piston accommodated in an internal space of a cylinder and forming a pair of pressure chambers together with the cylinder, the piston being configured to move relative to the cylinder; a first actuator connected to one pair of pressure chambers; a second actuator connected to the other of the pair of pressure chambers; a position detector configured to detect a position of the piston relative to the cylinder; a pressure detector configured to detect a pressure of one pair of pressure chambers; and a controller configured to control the first actuator and the second actuator. The controller controls one of the first actuator and the second actuator that the position detected by the position detector is made close to a target position and controls the other of the first actuator and the second actuator that the pressure detected by the pressure detector is made close to a target pressure.

HYDRAULIC ACTUATOR, ROBOT ARM, ROBOT HAND AND OPERATING METHOD

The hydraulic actuator comprises a hydraulic drive cylinder, a first hydraulic output cylinder which is hydraulically coupled to the drive cylinder, and a pressure valve which limits the pressure on the output limiting cylinder depending on an action time of a force on the drive cylinder and/or output piston, wherein the pressure limiting valve is arranged opposite a second output cylinder for limiting pressure and/or in a second output cylinder for relieving pressure, and wherein the second output cylinder is hydraulically coupled to the drive cylinder. The method is a method for operating such a hydraulic actuator, wherein the drive actuator is deflected with deflections having a deflection duration at a deflection frequency for the duration of an acting or a non-acting phase of the hydraulic actuator, wherein the deflection duration defines a movement stiffness of the hydraulic actuator and the deflection frequency defines the resulting deflection speed of the hydraulic actuator. 1. A hydraulic actuator comprising:a hydraulic drive cylinder comprising:a drive piston guided in the hydraulic drive cylinder; anda first hydraulic output cylinder hydraulically linked to the hydraulic drive cylinder and a pressure limiting valve that as a function of an action time of a force on the hydraulic drive cylinder, the drive piston, or the hydraulic output cylinder and drive piston in terms of pressure limits the first hydraulic output cylinder, wherein the pressure limiting valve is configured for limiting pressure in relation to a second output cylinder or for relieving pressure into the second output cylinder, and wherein the second output cylinder is hydraulically linked to the hydraulic drive cylinder.2. The hydraulic actuator of claim 1 , wherein the first output cylinder by way of a first pretensioned stop valve is linked to the hydraulic drive cylinder claim 1 , and the second output cylinder by way of a second pretensioned stop valve is linked to the hydraulic drive ...

HYDRAULIC POWER SYSTEM AND METHOD FOR CONTROLLING SAME

A system and method is provided for monitoring a hydraulic power system having at least one light emitter and a button. The method includes powering on the hydraulic power system, receiving an actuation at the button and detecting a release of the button after a first time interval, and entering a diagnostic state. The method further includes retrieving a code and displaying the code by turning on the emitter in a first pattern. In some embodiments, a system and method is provided for regulating a temperature of a hydraulic power system. In some embodiments, a system and method is provided for controlling operation of a hydraulic torque wrench. 1. A method controlling operation of a hydraulic power system coupled to a torque wrench , the hydraulic power system including a motor , a valve , and a controller , the method comprising:starting a cycle in response to receiving an actuation at a button;advancing a fluid actuator of the torque wrench;measuring a change in pressure of fluid in the fluid actuator of the torque wrench;comparing the change in pressure per unit time to a stored pressure slope; andretracting the fluid actuator of the torque wrench when the change in pressure is greater than the stored pressure slope.2. (canceled)3. The method of claim 2 , further comprising detecting a first inflection interval at which a change in pressure per unit time transitions from a value that is greater than a first reference pressure slope to a value that is less than the first reference pressure slope.4. The method of claim 3 , further comprising detecting a second inflection interval at which a change in pressure per unit time transitions from a value that is less than a second reference pressure slope to a value that is greater than the first reference pressure slope.5. The method of claim 4 , wherein detecting the second inflection interval is performed following a predetermined amount of time following the first inflection interval and wherein the change in pressure ...

Externally regulated control for drive pump

A control system is provided for a power machine that includes a hydraulic charge circuit with a hydraulic charge pump, and a variable displacement drive pump. A signal for control of displacement of the drive pump can be diverted from the hydraulic charge circuit downstream from the pump, including via a flow path that branches from the hydraulic charge circuit from a location upstream of a hydraulic load.

Electrohydraulic System for Use under Water, Comprising an Electrohydraulic Actuator

An electrohydraulic system for use under water includes an electrohydraulic actuator and a container. A hydraulic cylinder or a hydraulic motor and a hydraulic machine are arranged in an internal space of the container. The hydraulic machine is mechanically coupled to a rotary drive unit for a common rotary movement, and the hydraulic machine adjusts the hydraulic cylinder or the hydraulic motor. The rotary drive unit is arranged outside the container and is configured to couple to and decouple from the hydraulic machine. A device in one embodiment includes the electrohydraulic system. 1. An electrohydraulic system for use under water , comprising:an electrohydraulic actuator;a container having an internal space;a hydraulic cylinder or a hydraulic motor and a hydraulic machine arranged in the internal space of the container; anda rotary drive unit mechanically coupled to the hydraulic machine for a common rotary movement, the hydraulic machine configured to adjust at least the hydraulic cylinder or the hydraulic motor,wherein the rotary drive unit is arranged outside the container and is configured to couple to the hydraulic machine and decouple from the hydraulic machine.2. The electrohydraulic system as claimed in claim 1 , wherein the rotary drive unit is configured to adjust the hydraulic cylinder.3. The electrohydraulic system as claimed in claim 1 , wherein the hydraulic cylinder is a differential cylinder or a synchronizing cylinder.4. The electrohydraulic system as claimed in claim 1 , wherein the hydraulic cylinder includes a displaceable piston configured to adjust a process valve.5. The electrohydraulic system as claimed in claim 1 , wherein the hydraulic cylinder comprises a helical pressure spring configured to reset the hydraulic cylinder.6. The electrohydraulic system as claimed in claim 1 , wherein at least one solenoid valve is arranged such that a second cylinder chamber of the hydraulic cylinder is hydraulically balanced in the event of an ...

Electro-hydrostatic drive system

The present invention relates to an electro-hydrostatic system () with a hydraulic machine () which is driven by an electric motor () and has a variable volume and/or rotational speed for providing a volumetric flow rate of a hydraulic fluid, a differential cylinder () with a piston surface and with an annular surface, and at least one equalization container (), wherein the drive system () has a closed hydraulic circuit and during operation has an overpressure relative to the environment by means of the hydraulic machine () and/or a pretensioning source (), and the drive system () provides a movement of the cylinder in a first direction by means of a volumetric flow rate of the hydraulic machine () and a volumetric flow rate from the equalization container (), and provides a movement in a second direction by means of a volumetric flow rate of the hydraulic machine () and a volumetric flow rate into the equalization container (), and a power operating mode and a speed operating mode are provided with the differential cylinder (). 1. An electro-hydrostatic drive system comprising:a hydraulic machine which is driven by an electric motor and has a variable volume and/or rotational speed, for providing a volumetric flow rate of a hydraulic fluid,a differential cylinder with a piston surface and with an annular surface; andat least one equalization container,wherein during operation, the drive system has a closed hydraulic circuit and has an overpressure relative to the environment by means of the hydraulic machine and/or a pretensioning source,the drive system provides a movement of the cylinder in a first direction by means of a volumetric flow of the hydraulic machine and a volumetric flow from the equalization container, andprovides a movement in a second direction, by means of a volumetric flow of the hydraulic machine and a volumetric flow into the equalization container, and the operating modes of a power operating mode or speed operating mode are provided with the ...

Hydraulic circuit architecture with enhanced operation efficency

The present disclosure relates to a hydraulic drive system having a hydraulic circuit architecture operable in first and second modes. In a first mode, a main hydraulic pump ( 22 ) is used to drive a hydraulic actuator ( 24 ) via a closed hydraulic circuit, and a charge pump ( 42 ) provides charge flow to the closed hydraulic circuit. In a second mode the main pump set to zero displacement and the charge pump ( 42 ) is used to drive the hydraulic actuator ( 24 ).

METHOD FOR CONTROLLING A HYDRAULIC ACTUATOR

A method for controlling a hydraulic actuator () of a system () by means of a valve having a valve element is described. A position of the valve element determines a pressure supplied to a hydraulic actuator (). In such a method a variable dead band should be minimized. To this end a start position of the valve element is preadjusted as a function of at least one parameter outside the hydraulic actuator (). 1. A method for controlling a hydraulic actuator of a system by means of a valve having a valve element , wherein a position of the valve element determines a pressure supplied to the hydraulic actuator , wherein a start position of the valve element is preadjusted as a function of at least one parameter outside the hydraulic actuator.2. The method according to claim 1 , wherein the valve is a spool valve and the valve element is a spool claim 1 , wherein the spool is shifted in the spool valve.3. The method according to claim 1 , wherein the valve element is driven electrically or hydraulically.4. The method according to claim 1 , wherein at least one parameter is a load dependent parameter.5. The method according to claim 1 , wherein the parameter is a pressure in another hydraulic actuator of the system.6. The method according to claim 1 , wherein the start position is obtained by at least a look-up table claim 1 , wherein the look-up table shows a relation between the parameter and the start position.7. The method according to claim 1 , wherein the valve element is controlled by an input device wherein a resolution of the input device is scaled to a distance between the start position and an end position of the valve element.8. The method according to claim 1 , wherein at least one parameter is a parameter dependent on a geometry of the system.9. The method according to claim 8 , wherein a position of at least one other actuator in the system is measured.10. The method according to claim 1 , wherein the system comprises a crane and the actuator is a slewing ...

Working Machine

Closed circuit lines ( 33, 43, 53, 63 ) for connecting hydraulic cylinders ( 17, 18, 19 ) and closed circuit pumps ( 31, 41, 51, 61 ) are provided with a charge pressure adjustment apparatus ( 75 ) via a charge line ( 72 ) to variably adjust the pressure in the charge line ( 72 ). An operating device ( 12 ) for operating the hydraulic cylinders ( 17, 18, 19 ) and the charge pressure adjustment apparatus ( 75 ) are connected to a control device ( 81 ). In the case of extending the hydraulic cylinders ( 17, 18, 19 ), the control device ( 81 ) increases a set pressure of the charge pressure adjustment apparatus ( 75 ) to be high to increase the pressure in the bottom side of the hydraulic cylinders ( 17, 18, 19 ) in accordance with an operating amount of the operating device ( 12 ).

BRACKET MOUNT FOR ENGINE WITH PUMP PACKAGE

A power machine with an internal combustion engine and an in-line hydrostatic/hydraulic pump package includes a stiffening bracket which mounts a flywheel housing to the engine and is configured to change the natural frequency of the engine/pump package so that the engine firing frequency does not match the natural frequency of the engine/pump package. 1. A power machine , comprising:a frame; a power source including an engine and a flywheel housing mounted to the engine with a flywheel positioned within the flywheel housing and driven by an output of the engine;', 'a power conversion system including a hydraulic pump package that is mounted to the flywheel housing and is arranged in-line with and operatively coupled to the engine and a drive motor in hydraulic communication with the hydraulic pump package; and', 'a stiffening bracket fastened to the flywheel housing and to the engine and configured to alter a natural frequency of the combined engine and hydraulic pump; and, 'a power system supported by the frame, the power system includinga traction system having a tractive element operatively coupled to the drive motor and configured to be driven by the drive motor to control movement of the power machine.2. The power machine of claim 1 , wherein the engine is an internal combustion engine claim 1 , and wherein the stiffening bracket is configured to alter the natural frequency of the combined engine and hydraulic pump package system relative to a firing frequency of the internal combustion engine.3. The power machine of claim 2 , wherein the stiffening bracket is configured to increase the natural frequency of the combined engine and in-line pump package system.4. The power machine of claim 3 , wherein the hydraulic pump package is bolted to the flywheel housing with fasteners.5. The power machine of claim 3 , wherein the stiffening bracket includes first and second vertical support plates each secured to one of first and second opposing sides of the engine.6. ...

Apparatus for Controlling the Switch-Over of Hydraulic Cylinders

An electro-hydrostatic drive for realizing a rapid movement during a rapid movement phase, a force-building movement during a force-building movement phase. The apparatus comprises a hydro-machine with variable volume and/or rotational speed, driven by an electric motor, for providing a volume-stream of a hydraulic fluid, a first cylinder with a piston chamber, an rod chamber, and a plunger rod, a reservoir, a pressure source, a relief valve, a check valve, a fluid connection between the piston chamber and the hydro-machine, a fluid connection between the rod chamber and the hydro-machine, a fluid connection between the piston chamber and the reservoir, a fluid connection between the rod-chamber-side port of the hydro-machine and the reservoir, a fluid connection, through the relief valve, between the reservoir and the pressure source. The relief valve is for pressure safety of the reservoir, and the check valve has a fluid connection from the pressure source to the rod-chamber-side port of the hydro-machine, during the rapid movement phase, a first part of the hydraulic fluid is piped through the fluid connection between the piston chamber and the hydro-machine and the fluid connection between the rod chamber and the hydro-machine, and a second part of the hydraulic fluid communicates through the fluid connection between the piston chamber and the reservoir, during the force-building movement phase, a first part of the hydraulic fluid is piped through the fluid connection between the piston chamber and the hydro-machine and the fluid connection between the rod chamber and the hydro-machine, and a second part of the hydraulic fluid is piped through the fluid connection between the rod-chamber-side port of the hydro-machine and the reservoir. 1. An electro-hydrostatic drive for realizing a rapid movement during a rapid movement phase , a force-building movement during a force-building movement phase and a transition phase between the rapid movement phase and the ...

MINIATURE HIGH PRESSURE PUMP AND ELECTRICAL HYDRAULIC ACTUATION SYSTEM

Methods and apparatus pertaining to positive displacement pumps, and further to hydraulic actuation systems. In some embodiments the pumps are gear pumps with bi-directional operation. In some embodiments the actuation system includes a motor-driven, reversible operation gear pump providing fluid under pressure to a rod and cylinder. 1. An apparatus for pumping fluid , comprising:a pair of rotatable intermeshed gears, each gear including a shaft, each gear being located along the corresponding shaft, said gear pair being adapted and configured to simultaneously provide fluid at a higher pressure and fluid at a lower pressure;a pair of substantially identical bearing blocks, each bearing block including a pair of journal bearings, each journal of a bearing block supporting a corresponding shaft of said gear pair, said gear pair being located between said bearing blocks;a casing defining an interior cavity that contains said gears and said bearing blocks, said casing having a pair of opposing end faces;{'b': 1', '6', '2', '5, 'a pair of cover plates, each said cover plate having a face (R, R) being opposite of a face (R, R) of a corresponding bearing block; and'}a pair of face seals, each said face seal having an outer periphery located between one said cover plate and a corresponding end face and an inner periphery located between said same cover plate and a corresponding bearing block, the area between the inner periphery and the outer periphery being divided into first and second lateral regions (A, C) each being laterally adjacent and outboard of the gear pair and two end regions (B, D) each being outboard of a single corresponding gear of said pair;wherein rotation of said gear pair in a first direction provides higher pressure fluid to the first lateral region and lower pressure fluid to the second lateral region, and rotation of said gear pair in a second direction opposite of said first direction provides higher pressure fluid to the second lateral region and ...

Hydraulic Rotary Actuator

A hydraulic rotational actuator is provided for imparting rotational resistance, or powered rotation, thereby allowing for complete control of shaft, or axle, rotation or rotational resistance within the range of rotation. The hydraulic rotational actuator comprises a casing comprising a pair of cylinders with fluid in each cylinder. A pair of ports is in flow communication within each other wherein each port of is in flow relationship with a separate cylinder. A controller is provided which is capable of controlling flow of fluid between ports. A pair of pistons is provided wherein each piston is in a separate cylinder and engaged with the fluid such that the piston moves in the cylinder in response to fluid volume changing in the cylinder. A pair of connector rods is provided wherein each connector rod is pivotally attached to a separate piston. A pivot plate is pivotally connected to each connector rod opposite the piston and a shaft is attached to the pivot plate and adapted to rotate in concert with the pivot plate. 1. A hydraulic rotational actuator comprising:a casing comprising a pair of cylinders with fluid in each cylinder of said cylinders;a pair of ports in flow communication within each other wherein each port of said ports is in flow relationship with a separate cylinder of said cylinders;a controller capable of controlling flow of said fluid between said ports;a pair of pistons wherein each piston of said pistons is in a separate cylinder and engaged with said fluid such that said piston moves in said cylinder in response to said fluid volume changing in said cylinder;a pair of connector rods wherein each connector rod of said connector rods is pivotally attached to a separate piston;a pivot plate pivotally connected to each said connector rod opposite said piston; anda shaft attached to said pivot plate and adapted to rotate in concert with said pivot plate.2. The hydraulic rotational actuator of wherein said cylinders are parallel.3. The hydraulic ...

Electro-hydraulic system for the actuation of multiple clutches and gear selectors with high-precision control of several shift gearbox units simultaneously

A shift gearbox, a control unit and at least one electric-motor-driven piston-cylinder unit which has a piston and is connected via hydraulic lines to multiple shift gearbox units of the shift gearbox and shifts them, the shift gearbox units comprising at least two clutch units, characterised in that the piston of the piston-cylinder unit is in the form of a dual-action reciprocating piston, wherein the dual-action reciprocating piston sealingly separates two working chambers from each other, wherein each working chamber is connected via a main hydraulic line to one clutch each, and at least one working chamber of the dual-action reciprocating piston can be connected hydraulically via a switch valve to the reservoir.

HYDRAULIC HYBRID SWING DRIVE SYSTEM FOR EXCAVATORS

A swing drive system for an excavator is provided which utilizes a prime mover mechanically connected to a first hydraulic pump/motor and a second hydraulic pump/motor mechanically connected to a swing mechanism. The system includes a hydraulic circuit connecting a hydraulic fluid reservoir, a hydraulic accumulator, the first hydraulic pump/motor, and the second hydraulic pump/motor. The system is operable in one mode where the second hydraulic pump/motor acts as a pump to retard movement of the swing mechanism and pressurized hydraulic fluid from the second hydraulic pump/motor is pumped into the hydraulic accumulator. The system is operable in another mode where the pressurized fluid from the hydraulic accumulator is used to assist the prime mover in driving hydraulic consumers, including the swing drive. 1. An excavator comprising:a prime mover;an excavator swing mechanism;a first hydraulic pump/motor mechanically connected to the prime mover;a second hydraulic pump/motor mechanically connected to the excavator swing mechanism;a hydraulic fluid reservoir;a hydraulic accumulator;a hydraulic circuit connecting the hydraulic fluid reservoir, the hydraulic accumulator, the first hydraulic pump/motor, and the second hydraulic pump/motor;wherein, in a first mode, the second hydraulic pump/motor acts as a pump to retard movement of the excavator swing mechanism and pressurized hydraulic fluid from the second hydraulic pump/motor is pumped into the hydraulic accumulator; andwherein, in a second mode, the second hydraulic pump/motor acts as a motor to provide power to the excavator swing mechanism using pressurized fluid from the hydraulic accumulator.2. The excavator according to claim 1 , further comprising a directional valve positioned within the hydraulic circuit selectively reversing the flow of fluid through the hydraulic circuit and providing a fluid path to the hydraulic accumulator.3. The excavator according to claim 2 , further comprising an isolation valve ...

Linear Actuator Assembly and System

A linear actuator system includes a linear actuator and at least one proportional control valve and at least one pump connected to the linear actuator to provide fluid to operate the linear actuator. The at least one pump includes at least one fluid driver having a prime mover and a fluid displacement assembly to be driven by the prime mover such that fluid is transferred from the pump inlet to the pump outlet. The linear actuator system also includes a controller that establishes at least one of a speed and a torque of the at least one prime mover and concurrently establishes an opening of the at least one proportional control valve to adjust at least one of a flow and a pressure in the linear actuator system to an operational set point.

Hydraulic Axis With Energy Storage Feature

A closed-circuit, self-contained hydraulic axis includes an electric motor, a hydraulic cylinder configured to be connected to a load and a main pump driven by the electric motor to pump hydraulic fluid through the circuit. Pressure connections of the pump are connected to the respective chambers of the cylinder such that the cylinder rod is configured to extend and retract depending on a direction of flow of the hydraulic fluid through the main pump. The hydraulic axis includes a main accumulator connected to the pump via first control valve, an energy storage accumulator connected to the pump via a second control valve, and a charge pump. The hydraulic axis is switchable between a first operating mode that is free of energy storage in the energy storage accumulator, and a second operating mode in which energy is stored in the energy storage accumulator. 2. The hydraulic axis of claim 1 , wherein the hydraulic axis is switched between the first operating mode and the second operating mode by controlling the first control valve and the second control valve.3. The hydraulic axis of claim 2 , whereinwhen the hydraulic axis is configured so that the first control valve permits hydraulic fluid to flow to the main accumulator and the second control valve is closed, the hydraulic axis operates in the first operating mode, andwhen the hydraulic axis is configured so that the first control valve isolates the main accumulator from the first line and the second control valve is open, the hydraulic axis operates in the second mode.4. The hydraulic axis of claim 1 , wherein the energy storage accumulator is configured to store a variable amount of energy during each actuation cycle of the actuator.5. The hydraulic axis of claim 1 , wherein an amount of energy stored in the energy storage accumulator is varied in correspondence with variations of load applied to the rod.6. The hydraulic axis of claim 1 , comprising a charge pump that is driven by a second electric motor claim 1 ...

System to Pump Fluid and Control Thereof

A fluid system includes a variable-speed and/or a variable-torque pump to pump a fluid, at least one proportional control valve assembly, an actuator that is operated by the fluid to control a load, and a controller that establishes a speed and/or torque of the pump and a position of the at least one proportional control valve assembly. The pump includes at least one fluid driver that provides fluid to the actuator, which can be, e.g., a fluid-actuated cylinder, a fluid-driven motor or another type of fluid-driven actuator that controls a load. Each fluid driver includes a prime mover and a fluid displacement assembly. The fluid displacement assembly can be driven by the prime mover such that fluid is transferred from the inlet port to the outlet port of the pump. 130.-. (canceled)31. A hydraulic system comprising:a hydraulic pump with at least one electric motor to provide hydraulic fluid to a hydraulic actuator;a control valve to control a flow of the hydraulic fluid to the hydraulic actuator, wherein the control valve is configured to be throttled; anda controller configured to control the at least one electric motor to maintain a pressure in the hydraulic system to a pressure set point, the controller further configured to concurrently operate the control valve to control the flow to a flow set point.32. The hydraulic system of claim 31 , wherein the hydraulic system is a closed-loop system.33. The hydraulic system of claim 31 , wherein the control valve is throttleable between 0% and 100%.34. The hydraulic system of claim 31 , wherein the control valve is a ball valve.35. The hydraulic system of claim 34 , wherein the controller includes a characteristic curve for the ball valve that correlates a rotational position of the ball valve to a cross-sectional opening of the ball valve.36. The hydraulic system of claim 31 , further comprising:a gear assembly,wherein the at least one electric motor includes a first electric motor and a second electric motor, and the ...

Hydraulic Actuator System

The invention is directed to controlling a hydraulic actuation system having at least one degree of freedom, a prime mover, at least one actuation module and a controller, with each actuation module including: an over-center variable displacement pump having a power input connection configured to power the pump from the prime mover and a displacement varying input for varying the displacement of the pump; a displacement varying actuator configured to modulate the displacement varying input of the pump; an output actuator in direct communication with the pump, the output actuator configured to drive a corresponding degree of freedom; and at least one sensor establishing a feedback measurement that represents a force or motion of the output actuator. Based on a value of each feedback measurement, the force or motion of the output actuator is regulated by controlling the prime mover and the displacement actuator for the output actuator.

CRANE HAVING A CLOSED HYDRAULIC CIRCUIT

A crane, in particular a mobile crane, having a closed hydraulic circuit in which a hydraulic pump is hydraulically connected to at least one hydraulic motor via a feed and a discharge, and in which the feed is hydraulically connected to the discharge via at least one bypass which bypasses the at least one hydraulic motor, wherein the at least one bypass includes a continuously adjustable valve for variably controlling the fluid flow bypassing the at least one hydraulic motor. In addition, a corresponding control device and a corresponding crane control program for actuating a closed hydraulic circuit of a crane are provided. 110-. (canceled)11. A crane having a closed hydraulic circuit in which a hydraulic pump is hydraulically connected to at least one hydraulic motor via a feed and a discharge , and in which the feed is hydraulically connected to the discharge via at least one bypass which bypasses the at least one hydraulic motor , wherein the at least one bypass comprises a continuously adjustable valve for variably controlling the fluid flow bypassing the at least one hydraulic motor.12. The crane according to claim 11 , wherein the at least one bypass comprises a closing valve which is configured to close the bypass to the fluid flow in at least one flowing direction.13. The crane according to claim 11 , wherein the feed is hydraulically connected to the discharge via two bypasses which are connected in parallel and respectively comprise a continuously adjustable valve and a closing valve for variably controlling the fluid flow for the opposing slewing directions of the at least one hydraulic motor.14. The crane according to claim 11 , wherein at least one continuously adjustable valve is a proportional valve.15. The crane according to claim 11 , wherein at least one closing valve is a unidirectional valve.16. The crane according to claim 11 , wherein the delivery flow of the hydraulic pump is able to be variably adjusted.17. The crane according to claim 11 , ...

Construction Machine

An object of the present invention is to provide a construction machine capable of suppressing lugging down of an engine irrespective of contents of operation of an operator and the load state of a hydraulic actuator. A controller 50 includes: a demanded torque estimating section 50c configured to estimate demanded torque as torque demanded from an engine 9 by the first hydraulic pump on the basis of a demanded velocity of a first hydraulic actuator 1 and a load pressure on the first hydraulic actuator; a demanded velocity limiting section 50d configured to, in a case in which a demanded torque change rate as a change rate of the demanded torque exceeds a predetermined change rate, limit the demanded velocity such that the demanded torque change rate becomes equal to or lower than the predetermined change rate; and a command calculating section 50e configured to calculate a delivery flow rate of the first hydraulic pump on the basis of the demanded velocity of the first hydraulic actuator, the demanded velocity being limited by the demanded velocity limiting section.

Rotator arrangement

A rotator arrangement for providing a rotating movement between a crane arm or the like and a hydraulic tool, the rotator arrangement comprising: a first attachment piece arranged to be attached to the crane arm or the like, a second attachment piece arranged to be attached to the tool implement, a casing joining the first attachment piece to the second attachment piece, which casing is arranged to carry the loads of the hydraulic tool and includes a bearing or the like allowing a first part of the casing to rotate with respect to a second part of the casing, and a hydraulic rotation motor arranged to provide a rotational movement between the first and second attachment pieces around an axis of rotation, the motor comprising a stator and a rotor, the rotor being arranged inside the stator so as to rotate with respect to the stator around the same axis of rotation as the first and second attachment pieces.

Angular momentum propulsion apparatus and method

An angular momentum propulsion apparatus is disclosed that imparts motion on an object. The propulsion apparatus includes a support structure and a first tube assembly coupled to the support structure. The first tube assembly includes a first curved portion, a second curved portion coupled to the first curved portion by a pair of angled joints, and a pump configured to pump a fluid through the first and second curved portions of the first tube assembly. The propulsion apparatus further includes a motor coupled to the support structure and a control system coupled to the motor and the pump and configured to propel the propulsion apparatus by simultaneously controlling a rotation of the support structure and a flow of the fluid within the first tube assembly.

DOUBLE-ACTING HYDRAULIC ACTUATOR WITH DIFFERENT PUMPS FOR EACH ACTUATION DIRECTION

An actuator operable to move a valve stem between an opened position and a closed position includes a cylinder including an open side and a close side, the cylinder coupled to the valve stem, a first pump connected to the cylinder and operable to deliver a first high-pressure fluid to the open side of the cylinder to move the valve stem toward the opened position, and a second pump separate from the first pump, the second pump connected to the cylinder and operable to deliver a second high-pressure fluid to the close side of the cylinder to move the valve stem toward the closed position. 1. An actuator operable to move a valve stem between an opened position and a closed position , the actuator comprising:a cylinder including an open side and a close side, the cylinder coupled to the valve stem;a first pump connected to the cylinder and operable to deliver a first high-pressure fluid to the open side of the cylinder to move the valve stem toward the opened position; anda second pump separate from the first pump, the second pump connected to the cylinder and operable to deliver a second high-pressure fluid to the close side of the cylinder to move the valve stem toward the closed position.2. The actuator of claim 1 , wherein the cylinder includes a double acting cylinder with a biasing member positioned to bias the valve stem toward the closed position.3. The actuator of claim 1 , wherein the first pump and the second pump are fixed displacement pumps.4. The actuator of claim 3 , wherein the first pump is a micro-piston pump.5. The actuator of claim 1 , wherein the first pump includes a first pair of pumps and the second pump includes a second pair of pumps.6. The actuator of claim 1 , further comprising a first DC motor coupled to the first pump to drive the first pump claim 1 , and a second DC motor coupled to the second pump to drive the second pump.7. The actuator of claim 6 , further comprising a controller connected to the first motor and the second motor claim ...

Work machine hydraulic drive device

Provided is a hydraulic drive device that is provided in a work device and with which it is possible to obtain a high energy-saving effect with a low-cost configuration while being equipped with a plurality of hydraulic actuators. The hydraulic drive device is provided with: first and second actuator groups; closed circuits connected to hydraulic actuators included in the first actuator group; a pump section including closed circuit pumps; open circuits which include a plurality of variable throttle valves for changing the flow rate of working fluid supplied from a hydraulic pump included in the pump section to a hydraulic actuator; and circuit switching sections having a first state in which the closed circuits are opened and the opened circuits are blocked, and a second state in which the closed circuits are blocked and the open circuits are opened.

Miniature high pressure pump and electrical hydraulic actuation system

Methods and apparatus pertaining to positive displacement pumps, and further to hydraulic actuation systems. In some embodiments the pumps are gear pumps with bi-directional operation. In some embodiments the actuation system includes a motor-driven, reversible operation gear pump providing fluid under pressure to a rod and cylinder.

Electrohydraulic system for actuating multiple-disc clutches and gear actuators with highly precise control of a plurality of transmission units simultaneously

A shift gearbox may include at least two driven piston-cylinder units, which are each driven via a transmission of a drive, and the piston-cylinder units may each comprise a piston, which delimits a working chamber, and each working chamber is in hydraulic connection with at least one clutch actuator and at least one gear selector via a hydraulic main line, whereby the clutch actuator comprises a working chamber delimited by a piston. A valve may be respectively arranged between each working chamber of a clutch actuator and a hydraulic main line, and both the pressure build-up and the pressure reduction in the clutch actuators may occur by adjusting the piston of a piston-cylinder unit.

Work Vehicle

A work vehicle includes a bypass passage formed in an operational valve of a dump cylinder and configured to feed pressure oil from a hydraulic pump to a power steering device when the operational valve is under a neutral state and an oil feeding passage equipped with an orifice, the orifice-equipped oil feeding passage being configured to feed the pressure oil from the hydraulic pump to a rod side oil chamber of the dump cylinder when the operational valve is under the neutral state.

Electrohydrostatic Actuator System with an Expansion Reservoir

An electrohydrostatic actuator system comprising: a volume- and/or speed-variable hydraulic machine which is driven by an electric motor, for providing a volumetric flow of a hydraulic fluid; a differential cylinder with a piston side and a ring side; and at least one pretensioning source. The actuator system has a closed hydraulic circuit, wherein, during operation, the hydraulic fluid in the hydraulic circuit is pressurized by means of the hydraulic machine and/or the pretensioning source. Furthermore, according to the invention, the differential cylinder provides a power motion operating mode and a rapid motion operating mode. In order to balance a volume of the hydraulic fluid in the closed hydraulic circuit, according to the invention an expansion reservoir is connected to the piston side of the differential cylinder via a valve. 1. Electrohydrostatic actuator system comprising:a variable-volume and/or variable-speed hydraulic machine which is driven by an electric motor, for the provision of a volumetric flow of a hydraulic fluid;a differential cylinder having a piston side and a ring side;at least one pretensioning source;wherein the actuator system has a closed hydraulic circuit, and the hydraulic fluid in the hydraulic circuit is pressurized by means of the hydraulic machine and/or the pretensioning source during operation;wherein the actuator system has operating modes of a power motion and a rapid motion which are provided by the differential cylinder; andan expansion reservoir connected to the piston side of the differential cylinder via a valve for balancing a volume of the hydraulic fluid in the closed hydraulic circuit.2. Electrohydrostatic actuator system according to claim 1 , wherein the hydraulic fluid is pretensioned in the expansion reservoir at a pressure of less than 5 bar.3. Electrohydrostatic actuator system according to claim 1 , wherein the hydraulic fluid in the expansion reservoir has an ambient pressure and/or is arranged above the ...

Linear Actuator Assembly and System

A linear actuator system includes a linear actuator and at least one proportional control valve and at least one pump connected to the linear actuator to provide fluid to operate the linear actuator. The at least one pump includes at least one fluid driver having a prime mover and a fluid displacement assembly to be driven by the prime mover such that fluid is transferred from the pump inlet to the pump outlet. The linear actuator system also includes a controller that establishes at least one of a speed and a torque of the at least one prime mover and concurrently establishes an opening of the at least one proportional control valve to adjust at least one of a flow and a pressure in the linear actuator system to an operational set point. 1. A hydraulic system comprising:a linear hydraulic actuator having first and second ports; a hydraulic pump having a casing defining an interior volume, the casing having an inlet port in fluid communication with the interior volume, and an outlet port in fluid communication with the interior volume, the hydraulic pump having at least one fluid driver disposed inside the interior volume, each fluid driver having at least one of a variable-speed and a variable torque motor, and', 'a control valve assembly comprising a control valve in fluid communication with the linear hydraulic actuator; and, 'a hydraulic pump assembly conjoined with the linear hydraulic actuator, the hydraulic pump assembly to provide hydraulic fluid to operate the linear hydraulic actuator, the hydraulic pump assembly including,'}a controller that establishes at least one of a speed and a torque of the hydraulic pump so as to maintain at least one of a flow in the hydraulic system at a flow set point and a pressure in the hydraulic system at a pressure set point and concurrently establishes an opening of the control valve so as to maintain at least one of flail the flow in the hydraulic system at the flow set point and the pressure in the hydraulic system at ...

MANUALLY-OPERABLE HYDRAULIC STABILIZING SYSTEM

A stabilizing system includes a plurality of jacks, each operated by a corresponding hydraulic actuator. A hydraulic fluid transfer pump supplies hydraulic fluid to and receives hydraulic fluid from one or more pressure chambers of the actuator. A pilot-operated check or directional valve may be provided in fluid communication with one or more of the pressure chambers and configured to regulate the flow of hydraulic fluid to and from the pressure chamber. A directional control valve may connect the pump output with the jacks via respective pilot-operated directional valves. The directional control valve may include a plurality of switch positions respectively connecting the pump output with pairs of the jacks. 1. A method of operating a hydraulic stabilizing system including at least four hydraulic stabilizing jacks being a left front jack , a right front jack , a left rear jack , and a right rear jack , the method comprising:(a) setting a position of a directional control valve;(b) activating a fluid transfer pump; and(c) driving at least two of the at least four hydraulic stabilizing jacks via output from the fluid transfer pump,wherein the directional control valve includes a plurality of switch positions respectively connecting the fluid transfer pump with pairs of the hydraulic stabilizing jacks, and wherein step (c) is practiced by driving one of the pairs of the hydraulic stabilizing jacks according to the position of the directional control valve.2. A method according to claim 1 , wherein step (a) is practiced by setting the position of the directional control valve as one of (1) a front jacks positions connecting the output of the fluid transfer pump with the left front jack and the right front jack claim 1 , (2) a rear jacks position connecting the output of the fluid transfer pump with the left rear jack and the right rear jack claim 1 , (3) a left jacks position connecting the output of the fluid transfer pump with the left front jack and the left rear ...

Logic-Controlled Flow Compensation Circuit for Operating Single-Rod Hydrostatic Actuators

A single-rod hydrostatic actuator or pump-controlled actuator, comprises a hydrostatic pump connected in a closed circuit to a single-rod hydraulic cylinder where the cylinder velocity is directly controlled by the pump flow, without the need of intermediary valves. Due to the absence of throttling losses, the efficiency of hydrostatic actuators is considerably superior to the efficiency of conventional valve-controlled circuits. However, because of the differential areas at the cap and rod sides of the cylinder, the flows coming into and out of the cylinder do not match. Several attempts have been made to this date to produce a stable, robust and reliable circuit that can be used in everyday applications but no circuit has ever been conceived to reach the high standards of reliability and robustness required by industry. The current invention solves the problem of the differential flows with a design that is reliable, oscillation-free and robust. The present conception is based on the correction of a misstated theory concerning the modus operandi of hydrostatic actuators. The resulting design can be translated into different embodiments using electronic or hydraulic technologies and uses only logical combinations of the pressure readings at the cap and rod-sides of the circuit. 1. A hydrostatic actuator comprising:a hydraulic cylinder;a reversible hydraulic pump;a first main fluid line connecting a first side of the reversible hydraulic pump to a cap side of the hydraulic cylinder;a second main fluid line connecting a second side of the reversible hydraulic pump to a rod side of the hydraulic cylinder;a hydraulic charging circuit for supplying/releasing charging fluid to and from the first and second main fluid lines to compensate for differential flow on opposing sides of the hydraulic cylinder;a charge control system configured to (i) monitor a weighted pressure differential across a piston of the hydraulic cylinder, (ii) connect the hydraulic charging circuit to ...

HYDRAULIC SYSTEM FOR WORKING MACHINE

A hydraulic system includes a hydraulic actuator to be operated by an operation fluid, a first hydraulic pump to output the operation fluid, a second hydraulic pump to output the operation fluid, a control valve to which the operation fluid outputted from the first hydraulic pump is supplied, the control valve being configured to control the operation fluid that is to be supplied to the hydraulic actuator, a first fluid tube connecting the control valve to the hydraulic actuator, a second fluid tube to which the operation fluid outputted from the second hydraulic pump is supplied, the second fluid tube being connected to the first fluid tube, and a first switching valve disposed on the second fluid tube. The spool includes a communicating fluid passage being configured to supply the operation fluid to the first inner fluid passage, the operation fluid being received by the pressure-receiving port. 1. A hydraulic system for a working machine , comprising:a hydraulic actuator to be operated by an operation fluid;a first hydraulic pump to output the operation fluid;a second hydraulic pump to output the operation fluid;a control valve to which the operation fluid outputted from the first hydraulic pump is supplied, the control valve being configured to control the operation fluid that is to be supplied to the hydraulic actuator;a first fluid tube connecting the control valve to the hydraulic actuator;a second fluid tube to which the operation fluid outputted from the second hydraulic pump is supplied, the second fluid tube being connected to the first fluid tube; and a pressure-receiving port to receive a pressure of the operation fluid;', 'a first inner fluid passage to output the operation fluid; and', the first position to block the operation fluid from being supplied to the first fluid tube,', 'the second position to supply the operation fluid to the first fluid tube,, 'a spool to move between a first position and a second position due to the operation fluid applied ...

Dual Action Hydraulic Clutch System

A dual action hydraulic clutch system. The system includes a master cylinder having an outer piston therein, wherein the outer piston includes a channel therethrough that can receive an inner piston therein. A gap is formed between the outer and inner pistons, such that activation of the outer piston activates the inner piston once the outer piston has traveled a length of the gap. The outer piston forces hydraulic fluid through an outer outlet connected to a hydraulic clutch, and the inner piston forces hydraulic fluid through an inner outlet connected to a rear brake, allowing a user to simultaneously disengage the clutch and engage the rear brake. A lever is connected to the outer piston, such that the lever can move the outer piston between a resting position, a clutch position, and a brake position. The master cylinder can secure to a support surface via a mounting bracket thereon. 1) A dual action hydraulic clutch system , comprising:a master cylinder having an outer piston and an inner piston therein;wherein the outer piston comprises a channel configured to receive an inner piston therein;wherein the inner piston is configured to extend along the channel such that a gap is formed between a proximal end of the inner piston and an interior surface of the channel;an outer pressure chamber formed annularly about an interior volume of the master cylinder along a lower end of the outer piston;an inner pressure chamber formed within the interior volume about a distal end of the inner piston;a reservoir configured to hold hydraulic fluid therein;wherein the reservoir is in fluid communication with each of the inner pressure chamber and the outer pressure chamber via interior inlet ports and outer inlet ports, respectively;an outer outlet port through the outer pressure chamber, wherein the outer outlet port is operably connected to a hydraulic clutch;an inner outlet port through the inner pressure chamber, wherein the inner outlet port is operably connected to a ...

HYDRAULIC PRESSURE GENERATING DEVICE

A hydraulic pressure generating device includes a base body having a master cylinder configured to generate a brake hydraulic pressure and a slave cylinder configured to generate a brake hydraulic pressure. The base body is provided with a motor configured as a driving source for the slave cylinder and a control device configured to control the motor. A motor shaft of the motor, a cylinder axis of the master cylinder, and a cylinder axis of the slave cylinder are disposed in parallel with each other. Then a virtual plane including the cylinder axis of the master cylinder is set as a reference plane, a housing of the control device is disposed on one side of the reference plane and the motor is disposed on the other side of the reference plane. 1. A hydraulic pressure generating device comprising a base body having a master cylinder configured to generate a brake hydraulic pressure and a slave cylinder configured to generate a brake hydraulic pressure ,wherein the base body is provided with a motor configured as a driving source for the slave cylinder and a control device configured to control the motor,wherein a motor shaft of the motor, a cylinder axis of the master cylinder, and a cylinder axis of the slave cylinder are disposed in parallel with each other, andwherein when a virtual plane including the cylinder axis of the master cylinder is set as a reference plane, a housing of the control device is disposed on one side of the reference plane and the motor is disposed on the other side of the reference plane.2. A hydraulic pressure generating device according to claim 1 ,wherein the motor comprises a motor connector to be electrically connected to a control board contained in the housing, andwherein a cylinder axis of the motor connector is perpendicular to the motor shaft.3. A hydraulic pressure generating device according to claim 2 ,wherein the housing comprises a cylindrical peripheral wall portion, a lid part attached to an opening of the peripheral wall ...

INDUSTRIAL SYSTEM WITH SYNTHETICALLY COMMUTATED VARIABLE DISPLACEMENT FLUID WORKING MACHINE

An injection moulding system, water jet cutting machine or other industrial system has a synthetically controlled variable displacement fluid working machine which outputs hydraulic fluid to one or more fluid consumers, such as rams or hydraulic motors, through hydraulically stiff fluid retaining volumes and receives hydraulic fluid back from one or more fluid consumers through the same or other said hydraulically stiff fluid retaining volumes. Individual piston cylinder assemblies can be allocated to different outputs. There may be no valve between the machine and the consumers. A working chamber of the machine can be caused to undergo a motoring cycle to enable the machine to output more power than is received from a motor driving the machine. An accumulator can be used to provide a source of hydraulic compliance. The machine can be controlled using pressure control, flow control, feed forward control or variable power/variable power limit control. 2. An industrial system according to claim 1 , where at least one of the fluid retaining bodies is hydraulically stiff.3. An industrial system according to where the volume of the at least one fluid retaining body changes claim 2 , when varying flow between zero flow and operating pressure or high pressure flow either by less than 2% claim 2 , or the required number of machine piston stroke cycles producing a variation in flow between zero flow and operating pressure or high pressure flow is less than or equal to five.4. An industrial system according to claim 1 , where there is no valve hydraulically intermediate the fluid working machine and one or more said fluid consumer claim 1 , which would otherwise function to check and/or divert flow claim 1 , and there is no cross line relief between portions of the circuit.5. An industrial system according to claim 1 , further comprises at least one additional fluid working machine comprising a plurality of working chambers of cyclically varying volume claim 1 , a rotatable ...

Prime Mover System and Methods Utilizing Balanced Flow within Bi-Directional Power Units

Systems, methods and devices are described providing a selective hydraulic or electrically powered prime mover that is a bi-directional power unit system, including movement within a device used to compress and/or expand a fluid and provide fluid movement. The use of a hydraulic power unit is involved and comprises at least a pump or other fluid moving device, a first set of selective control valves delivering pressurized fluid to the device(s), and a second set of selective control valves returning unpressurized fluid from the device(s), a reservoir comprising a compensator tank, a port for operation at ambient pressure, and a pressure measuring device measuring ambient pressure allowing for unbalanced flow to and from the device as well as thermal expansion or compression. The use of a multiport and in some cases a swashplate pump that incorporates the features and functions of several valves for the system is also described. 1. A prime mover apparatus and system for actuating and moving one or more moving devices in either a single or bi-directional direction that utilizes at least one hydraulic power unit(s) (HPU) comprising;one or more multiport pumps, said pumps having at least one inlet port, one outlet port, and one reservoir port that act to balance fluid flow and allow fluid flow in either a clockwise or counterclockwise direction into and out of a pipeline that has access to at least one reservoir such that said fluid flow enters and exits said pumps from either a designated clockwise (CW) or counterclockwise (CCW) inlet/outlet port such that a clockwise or counterclockwise flow path is created with said one or more multiport pumps and ensures balanced fluid flow into and out of said apparatus and system.2. The prime mover apparatus and system of claim 1 , wherein said one or more pumps are selected from the group consisting of; swashplate pumps claim 1 , reciprocating pumps claim 1 , scroll pumps claim 1 , piston pumps claim 1 , positive displacement ...

Hydraulic drive system of construction machine

A bi-directional pump connected to a motor by a pair of supply/discharge lines; a regulator changes the bi-directional pump tilting angle; and a controller controls the regulator based on a turning signal outputted from a turning operation valve. At the turning acceleration, at which the signal increases, the controller calculates a motor flow rate passing through the motor and an instruction flow rate determined based on the turning signal. If the instruction flow rate is greater than a reference flow rate obtained by adding a predetermined value to the motor flow rate, the controller controls the regulator so the bi-directional pump tilting angle is adjusted to a tilting angle realizing the reference flow rate. If the instruction flow rate is not greater than the reference flow rate, the controller controls the regulator so the bi-directional pump tilting angle is adjusted to a tilting angle realizing the instruction flow rate.

ACTUATOR MODULE

An electro-hydraulic linear actuator module comprising a stator having a cylindrical bore therethrough, a linear electric machine translator movable axially within the stator bore, a positive displacement chamber adjacent each end of the translator for holding, in use, an incompressible fluid, first and second fluid pathways, one to each chamber, for the flow of an incompressible fluid, wherein movement of the translator along the stator bore alters the volumes of the chambers. 135-. (canceled)36. A linear electro-hydrostatic actuator system comprising: a stator having a cylindrical bore therethrough;', 'a linear electric machine translator movable axially within the stator bore;', 'a positive displacement chamber adjacent each end of the translator for holding, in use, an incompressible fluid;', 'first and second fluid pathways, one leading into each chamber, for the flow of an incompressible fluid into and/or out of the respective chamber,', 'wherein movement of the translator along the stator bore alters the volumes of the chambers; and', a hydraulically operated linear mover; and', 'a positive displacement chamber adjacent each end of the hydraulically operated linear mover for holding, in use, an incompressible fluid,, 'a hydraulically operated linear mover module comprising, 'wherein at least one chamber of the hydraulically operated linear mover module is fluidly connected to the first or second fluid pathway so that, in use, movement of one of the linear electric machine translator or the hydraulically operated linear mover causes movement of the other., 'an electro-hydraulic linear actuator module comprising37. A system according to claim 36 , further comprising one or more hydrodynamic bearings between the stator and the translator.38. A system according to claim 36 , wherein the stator and the translator define a gap therebetween.39. A system according to claim 38 , wherein claim 38 , in use claim 38 , the gap contains incompressible fluid.40. A system ...

CLOSED-CIRCUIT HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE

The present disclosure relates to a closed circuit hydraulic system for a construction machine including a plurality of actuators and a plurality of hydraulic pumps selectively supplying working oil to the plurality of actuators bidirectionally and the closed circuit hydraulic system includes: a charge line selectively connected with a low-pressure side hydraulic line which returns to the hydraulic pump from the actuator among hydraulic lines connecting the hydraulic pumps and the actuators; a charge pump supplying a supplement flow to the charge line; and a variable relief valve selectively changing a normal mode to limit a pressure of the charge line to a predetermined pressure or less and a boost mode to limit the pressure of the charge line to a pressure lower than the pressure of the charge line in the normal mode. 1. A closed circuit hydraulic system for a construction machine including a plurality of actuators and a plurality of hydraulic pumps selectively supplying working oil to the plurality of actuators bidirectionally , the system comprising:a charge line selectively connected with a low-pressure side hydraulic line which returns to the hydraulic pump from the actuator among hydraulic lines connecting the hydraulic pumps and the actuators;a charge pump supplying a supplement flow to the charge line; anda variable relief valve selectively changing a normal mode to limit a pressure of the charge line to a predetermined pressure or less and a boost mode to limit the pressure of the charge line to a pressure lower than the pressure of the charge line in the normal mode.2. The closed circuit hydraulic system for a construction machine of claim 1 , further comprising:a pair of pilot check valves installed on the hydraulic lines in parallel so that the low-pressure side hydraulic line is in communication with the charge line by receiving a pilot signal from a high-pressure side hydraulic line among the hydraulic lines.3. The closed circuit hydraulic system for ...

Steering System for a Trailing Axle of a Vehicle

A steering system for a trailing or leading axle of a vehicle includes a steering angle sensor for measuring a steering angle of wheels of a front axle of the vehicle, a driving speed sensor for measuring a driving speed of the vehicle, an electric motor that drives a hydraulic pump, and a working cylinder connected to the hydraulic pump for steering the wheels of the trailing axle. The system also includes a control device that determines a trailing angle of wheels on the trailing axle of the vehicle and actuates the electric motor in a corresponding manner. The working cylinder has a center position borehole via which hydraulic fluid is released from the working cylinder. A piston closes the center position borehole in the straight-ahead position of the wheels of the trailing axle. The center position borehole can only be closed by a piston seal of the piston. 1. A steering system for at least one trailing or leading axle of a vehicle , comprising:a steering angle sensor configured to measure a steering angle of wheels of a front axle of the vehicle,a driving speed sensor configured to measure a driving speed of the vehicle,an electric motor that drives a hydraulic pump,a working cylinder configured to steer the wheels of the trailing axle, the working cylinder connected to the hydraulic pump via feed lines,a control device which, with the aid of the data from the steering angle sensor and the driving speed sensor, determines a trailing angle of wheels on the trailing axle of the vehicle and activates the electric motor accordingly,wherein the working cylinder has a central position borehole via which hydraulic fluid is configured to be discharged from the working cylinder, the central position borehole of the working cylinder being connected to a central position valve via which hydraulic fluid can is configured to flow back into a tank,wherein, in the straight-ahead position of the wheels of the trailing axle, a piston closes the central position borehole, ...

DRIVE-TORQUE AMPLIFIER FOR A MOVING SHAFT

The invention relates to a machine that amplifies the drive torque of a moving shaft, which is formed by at least one pair of identical units facing a central shaft, each unit being formed by at least one mechanical actuator (cam), a hydraulic actuator (amplified linear force that provides the application of Pascal's law) and a mechanism comprising a piston, connecting rod and crankshaft. For mechanical considerations, the machine is a two-stroke engine (compression and intake) having at least two opposite horizontal pistons, that is, a 180° V engine. 141469112092120121421085697523418224114. Machine that amplifies the torque of a rotating shaft characterised in that it comprises: at least one pair of identical units () on either side of a crankshaft (); each unit () formed by an outer case () and an inner case () inside which a plunger () moves , a piston () that moves inside the inner case () , a connecting rod () that transfers the amplified force of the piston () to convert it into torque for the crankshaft () that contains at least one elbow for the connecting rods () of the pair of units () and at least one cam () , a compression chamber () , whose walls are formed by a motor block () , a cylinder head () , the outer case () and the inner case () , a cylinder head flange () that secures the cylinder head () , a mating flange () that secures the pair of units () to each other , a roller follower () for each cam () and at least two rods () that attach together to the plungers () of the pair of units ().221181. Machine that amplifies the torque of a rotating shaft according to claim 1 , characterised in that the cam () is circular and eccentric with respect to the crankshaft () in such a way that one section of the surface of the cam which makes contact with the roller follower () is tangent to the surface of the crankshaft ().3120211. Machine that amplifies the torque of a rotating shaft according to claim 1 , characterised in that its crankshaft () receives both ...