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| Number | Title | Issue Date |
| 7788918 | Hydraulic circuit for actuation of a hydraulic working cylinder A hydraulic circuit for actuation of a hydraulic working cylinder (1) having a one-sided piston rod (1a), comprising a reversible pump (4) whereby both sides of said pump are connected via a supply line (5) and a first two-way valv... | 09/07/2010 |
| 7784278 | Hydraulic drive The invention relates to a hydraulic drive, comprising a hydraulic cylinder (1), divided into a first operating pressure chamber (4) and a second operating pressure chamber (5), by an operating piston (3). The hydraulic drive further comp... | 08/31/2010 |
| 7513112 | Reservoir built-in type actuator A stand pipe is disposed so as to be fitted with the inner periphery surface of a piston rod with a hollow structure and a reservoir is incorporated into the inside of the stand pipe, whereby it becomes possible to reduce the size of an EHA device. Besides, since th... | 04/07/2009 |
| 7434395 | Apparatus and method for dual mode compact hydraulic system A dual mode hydraulic actuator, comprising: a housing; a rod secured to a piston, the rod and piston being slidably received within the housing; a first chamber positioned on one side of the piston; a second chamber positioned on another side of the piston; a sealed... | 10/14/2008 |
| 7325398 | Closed circuit energy recovery system for a work implement A closed circuit hydraulic system includes a fluid reservoir, a hydraulic cylinder having a cylinder rod, a bidirectional variable displacement hydraulic pump that pumps fluid to either extend or retract the cylinder rod on demand, a flow control valve for relieving... | 02/05/2008 |
| 7309218 | Gear pump A pump suitable for use with contamination-sensitive fluids such as food products or pharmaceutical fluids includes an outer casing containing an internal cavity, the outer casing having an enlarged opening on one end, a second opening on an opposite end, a first in... | 12/18/2007 |
| 7267043 | Actuators with diaphragm and methods of operating same Actuator assemblies comprise an actuator element and two piezoelectric assemblies, with the two piezoelectric assemblies being configured and arranged for controlling movement of the actuator element. In some example implementations, the first piezoelectric assembly... | 09/11/2007 |
| 7249458 | Self-contained hydraulic actuator system The hydraulic linear actuator system of the present invention includes a pump that is configured to rotate in a single direction at a substantially constant velocity. Both the direction and flow rate of fluid through the system is controlled by adjusting the positio... | 07/31/2007 |
| 7234298 | Hybrid hydraulic system and work machine using same A hydraulic system and work machine are provided, the hydraulic system including at least one hydraulic cylinder with a first port and a second port connected by a first fluid passage. A first pump, which is a bi-directional hydraulic pump is positioned within the f... | 06/26/2007 |
| 7174988 | Power steering system A power steering system includes a reversible-type oil pump supplying hydraulic fluid to first and second pressure chambers of a hydraulic power cylinder through first and second passages and having first and second discharge ports, and a branch passage conveying pa... | 02/13/2007 |
| 7172257 | Crawler track tension adjusting device A crawler track tension adjusting device is provided in which a driving unit having a closed structure carries out automatic tension adjustment in response to a control signal to create optimum tension on a crawler belt. The crawler track tension adjusting device in... | 02/06/2007 |
| RE39158 | Hydraulic system, manifold and volumetric compensator A hydraulic system manifold having a body, a counterbalancer in the body and a flow controller in the body is disclosed. The body has first and second pump ports, first and second cylinder ports, first and second compensator ports and first and second supply conduit... | 07/11/2006 |
| 7055319 | Piston and cylinder assembly with volume compensating system A piston and cylinder assembly having a cylinder with a piston and a connected piston rod. The piston defines opposed chambers wherein a compensating device is disposed in at least one of the chambers. The compensating device includes a capsule of an elastic materia... | 06/06/2006 |
| 7055320 | Actuator An actuator comprises a pump-driving section which is driven and rotated by a current, and a pump mechanism which is connected to the pump-driving section and which sucks/discharges a pressure oil. A cylinder mechanism, which has a piston that is displaceable in the... | 06/06/2006 |
| 7051526 | Closed-system electrohydraulic actuator An electrohydraulic actuator (10) includes a fluid-powered actuator (11) having a piston (15) in a cylinder (16). The piston divides the cylinder into two opposed chambers (18, 19). The actuator includes a fixed-displacement revers... | 05/30/2006 |
| 6984113 | Oil pressure operated pump for marine steering gears with a valve set shell with valves separately capable of assembly with the valve housing An oil pressure operated pump for marine steering gears includes a multiple piston oil pressure operated pump controlled by a steering wheel, a valve housing mounted under the pump, a bottom cover closing the valve, the valve housing and the cover each including cha... | 01/10/2006 |
| 6979185 | Bi-rotational pump/hydraulic actuator A novel bi-rotational pump adapted to pump fluid in either of two directions by reason of construction inclusive of passageways and an array of check valves and pilot pistons which cooperate in one direction and in another way in the other direction. ... | 12/27/2005 |
| 6912849 | Cylinder driving system and energy regenerating method thereof A cylinder driving system capable of reducing the number of hydraulic devices and the amount of energy loss and an energy regenerating method thereof are provided. To this end, the system includes i) a hydraulic cylinder, ii) a hydraulic pump having three suction/di... | 07/05/2005 |
| 6889501 | Hydraulic swinging-leaf door drive A hydraulic swinging-leaf door drive for swinging doors includes an actuating piston, which acts on a drive shaft. A hydraulic pump acts on the actuating piston by way of a hydraulic circuit. The hydraulic circuit is designed as a closed circuit. ... | 05/10/2005 |
| 6886332 | Bi-rotational, two-stage hydraulic system A hydraulic system for an actuator provides staged operation during extend and retract. A pair of reversible pumps are conjointly driven by a reversible motor. A relief valve in the retract circuit directs fluid to tank when fluid pressure increases above a predeter... | 05/03/2005 |
| 6796120 | Electrohydraulic actuator An electrohydraulic actuator comprising: a hydraulic actuator comprising a piston secured to a member to be controlled and capable of moving in a cylinder under drive from a hydraulic fluid; a hydraulic pump feeding both faces of the piston with hydraulic fluid via ... | 09/28/2004 |
| 6751954 | Compact hybrid actuator A compact hybrid actuator has a fluid pump (20) arranged to supply fluid to an actuator (44). The pump has at least one electrically-powered solid-state pump driver (21) provided with a displacement element (22). The position of this disp... | 06/22/2004 |
| 6662559 | Hydraulic actuator The present invention provides a hydraulic actuator suitable for use in marine and other harsh environments. In the presently preferred embodiment, the hydraulic actuator includes a motor that is coupled to a pump assembly that is configured to displace h... | 12/16/2003 |
| 6591607 | Hydraulic manipulator A hydraulic manipulator having an ergonomic handle and good transmission behavior. There is an input drive element of the manipulator which is a hydraulic pump with two conveyance directions. The input drive movement is introduced on the drive shaft of th... | 07/15/2003 |
| 6557344 | Hydraulic drive with several hydraulic consumers also comprising a differential cylinder The invention relates to a hydraulic drive with a plurality of hydraulic consumers also comprising a differential cylinder which are located in particular on a plastics injection-molding machine. There are a first hydraulic machine and a second hydraulic ... | 05/06/2003 |
| 6519939 | Hydraulic system, manifold and volumetric compensator A hydraulic system manifold having a body, a counterbalancer in the body and a flow controller in the body is disclosed. The body has first and second pump ports, first and second cylinder ports, first and second compensator ports and first and second sup... | 02/18/2003 |
| 6481202 | Hydraulic system for boom hoist cylinder crane A crane having an upper works rotatably mounted on a lower works and a boom pivotally mounted on the upper works includes a hydraulic boom hoist cylinder and a hydraulic circuit for controlling the hydraulic boom hoist cylinder. The hydraulic cylinder is ... | 11/19/2002 |
| 6290474 | Machine hydraulic system A machine, in particular an industrial truck, is provided with a hydraulic system that has at least one reservoir (1) for hydraulic fluid and at least one hydraulic pump (5). The hydraulic pump (5) is located inside the reservoir (1). A priority valve (8a... | 09/18/2001 |
| 6055809 | Remote steering system with a single rod cylinder and manual hydraulic piston pump for such a system A hydraulic piston pump 1 includes a distributing valve 11 having a pair of arcuate or circular ports 11a and 11b formed through it. The arcuate port 11b is shorter circumferentially than the arcuate port 11a to reduce, by a predetermined amount, the amou... | 05/02/2000 |
| 5937646 | Hydraulic charge boost system for a gantry crane In a hydraulic cylinder actuation system for a crane having a conventionally charged main hydraulic pump, a supplemental pump or "charge boost" pump is provided. To efficiently achieve fast actuation speeds of the cylinder, the charge boost pump provides ... | 08/17/1999 |
| 5613361 | Hydraulic circuit for supplying a plurality of series-operated of a hydraulically controlled installation A hydraulic circuit for supplying a plurality of series-operated consumers of a hydraulically controlled installation, in particular of an injection molding machine, having a pump with feed-flow pressure control, is described. To be able to slow down grea... | 03/25/1997 |
| 5329767 | Hydraulic circuit flow control A hydraulic system incorporating a double acting piston and cylinder and a bi-directional pump/motor derives energy from a drive system when operating in the pump mode and delivers energy to the drive system when in the pump mode and includes a circulatio... | 07/19/1994 |
| 5179836 | Hydraulic system for a differential piston type cylinder A first cylinder chamber of a hydraulic cylinder is connected to a pair of variable displacement pumps of which the first one is connected to a reservoir and second one is connected to the second cylinder chamber. This allows to bias the piston by a hydra... | 01/19/1993 |
| 5148901 | Hub clutch for automotive vehicle A hub clutch for locking or unlocking a wheel drive shaft to or form a hub clutch housing, comprises: a drive gear fixed to the wheel drive shaft; a slide gear slidably engaged or disengaged with or from the drive gear to lock or unlock the wheel drive sh... | 09/22/1992 |
| 5144801 | Electro-hydraulic actuator system An electro-hydraulic actuator having an electric motor disposed in a hydraulic fluid reservoir and connected to drive a hydraulic fluid pump. The actuator includes a piston rod which extends or retracts as a piston is hydraulically driven in a cylinder. A... | 09/08/1992 |
| 5069037 | Fluid supply system for vehicles A single hydraulic pump (6) is employed in a vehicle for supplementing fluid to a hydrostatic transmission (1) and for supplying fluid to a fluid-operated clutch (2) and to high pressure-actuated hydraulic actuators (3, 4, 5). Fluid discharge path (7) of ... | 12/03/1991 |
| 5063740 | Electrohydraulic servodevice for position control The position of a controlled system is regulated with a hydraulic actuator, which is directly linked to a hydraulic pump. The pump is driven in either direction by an electric motor, which is controlled by the output of rotatory direction and driving powe... | 11/12/1991 |
| 4961316 | Controlled electric pump drive for hydraulic lifting arrangement with gas spring in motor A hydraulic lifting arrangement for a lift assembly on a materials-handling vehicle includes a working piston-cylinder device (17) for raising and lowering the lift assembly, a reversible pump assembly (40) for operating the piston-cylinder device, and an... | 10/09/1990 |
| 4953639 | Closed loop hydraulic drill feed system A closed loop hydraulic system for use in a rotary drilling apparatus includes an extendible-retractable feed cylinder and a valve for biasing the feed cylinder. A variable, reversible displacement pump is provided for pumping fluid from either of the fir... | 09/04/1990 |
| 4811562 | Adjusting drive A compact electric adjusting drive for locking systems, fan flaps or the like in motor vehicles includes a fluidic force transmission system between the electric motor and the adjusting element movable to and fro between two end positions.... | 03/14/1989 |
