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| Number | Title | Issue Date |
| 8020379 | Double redundancy electro hydrostatic actuator system A double redundancy electro hydrostatic actuator system includes two hydraulic pumps; two fail safe valves connected with the two hydraulic pumps, respectively; one dual tandem hydraulic cylinder connected with the two fail safe valves and having a piston rod, where... | 09/20/2011 |
| 7934376 | Hydraulic actuation assembly An assembly for the hydraulic actuation of safety equipment includes a hydraulic pump disposed between a fluid feed line and a supply line in fluid communication with the safety equipment. A pump valve in the supply line downstream of the hydraulic pump is adjustabl... | 05/03/2011 |
| 7870726 | Local backup hydraulic actuator for aircraft control systems A backup system is provided that has a local electric motor and pump for some or all of hydraulic actuators. A local backup hydraulic actuator has two power sources, hydraulic as primary and electrical as backup. During normal operation, the hydraulic actuator recei... | 01/18/2011 |
| 7255730 | Fluid deceleration/de-aeration device A fluid deceleration device is provided for a hydraulic system having a housing forming a sump, and a valve unit having an outlet port through which hydraulic fluid is expelled for communication to the sump. The fluid deceleration device includes an elongated tilted... | 08/14/2007 |
| 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 |
| 7226020 | Apparatus for driving and adjusting flaps hinged to an aircraft Flaps, for example leading edge flaps and/or trailing edge flaps of an aircraft wing, are driven and adjusted by respective drive units. Drive shafts of neighboring flaps are coupled to each other by a differential gear. The differential gear is thus coupled to a ma... | 06/05/2007 |
| 7200993 | Electro-hydraulic steering control system An electro-hydraulic steering control system for directing fluid to steering actuators on a work machine may include a main valve configured to control fluid flow to the steering actuators. Left and right primary steering valves may be in communication with and conf... | 04/10/2007 |
| 7174711 | Hydraulic control system and construction machine A hydraulic control system of the present invention comprising control valves for controlling the direction and flow rate of pressure oil discharged from a hydraulic pump, hydraulic actuators which the pressure oil is fed to and controlled by the control valves, the... | 02/13/2007 |
| 7172391 | Propeller actuation system An auxiliary tank is filled by a pitch control system, which enables the size of the auxiliary tank to be reduced. ... | 02/06/2007 |
| 7168245 | Work machine with supplemental power steering A steering system for a work machine having a hydrostatic transmission is disclosed. The steering system has a primary source of pressurized fluid and a steering control valve. The steering system also has a first fluid passageway fluidly connecting the primary sour... | 01/30/2007 |
| 7152401 | Hydraulic steering arrangement A hydraulic steering arrangement includes a steering valve, a steering motor, connected with a high-pressure connection and a low-pressure connection via the steering valve, and with a steering unit, connected via the steering valve with a pilot pressure valve, whos... | 12/26/2006 |
| 7150288 | Control valve apparatus A control for parallel hybrid transmission has a valve mechanism, which is operable to supply fluid pressure to a torque-transmitting mechanism with or without the operation of the vehicle engine. The valve mechanism is responsive to an electrically driven pump to s... | 12/19/2006 |
| 7114490 | Multiple pump fuel delivery system A multiple pump fuel delivery system is provided, which in one preferred embodiment includes a tank. Mounted within the tank are multiple fuel pumps. The fuel pumps have intakes connected to filters. One pump may be connected to a fuel only passing filter, and anoth... | 10/03/2006 |
| 6996979 | Hydraulic circuit for a hydraulic excavator A hydraulic circuit for a hydraulic excavator having a motor drive which acts on at least two closed drive circuits which are connected in parallel, each have a hydraulic pump and a hydraulic motor and which operate on a common output drive, connecting lines being p... | 02/14/2006 |
| 6931846 | Equalizing flow from pressure compensated pumps, with or without load sensing, in a multiple pump circuit A rotary flow combiner allows flow from multiple pressure compensated hydraulic pumps; with or without load sensing to be combined into a single outlet. The flows are combined in such a way that each input to the rotary flow combiner has equal flow. The flow from ea... | 08/23/2005 |
| 6892534 | Electro-hydrostatic actuator with a failsafe system An electro-hydrostatic actuator unit that contains a sealed pressurized housing filled with a dielectric fluid. A bi-directional motor is immersed in the fluid and drives a gear pump for exchanging fluid via a control circuit between the chambers of a bi-directional... | 05/17/2005 |
| 6845613 | Last chance aircraft back-up hydraulic system A last chance aircraft back-up hydraulic system in which fuel from the fuel tanks of the aircraft is injected into the return line of a leaking hydraulic system by use of a pump activated by a guarded switch by the aircraft's pilot. The fuel serves as hydraulic flui... | 01/25/2005 |
| 6823669 | Transfer valve system A hydraulic transfer valve system has a main valve selectively placing one of a primary and secondary hydraulic system in communication with a hydraulic load. A pilot valve provides a toggling action between the primary and secondary systems with respect to pressure... | 11/30/2004 |
| 6817175 | Hydraulic system architecture for controlling steering The invention relates to a hydraulic steering system architecture comprising at least one steering control actuator having chambers connected to the outlets of a directional-control valve, an accumulator, and an electrically-driven pump unit associated with an emerg... | 11/16/2004 |
| 6769251 | Hydraulic system architecture for controlling steering The invention relates to an architecture for a hydraulic steering control system including at least one actuator; the hydraulic system comprises a directional-control valve connected to a pressure-generator device and to an associated main supply, the hydraulic syst... | 08/03/2004 |
| 6612108 | Manifold assembly for interconnecting brake booster to engine and vacuum pump A manifold assembly for pneumatically interconnecting a brake booster to an engine and to an electrically-driven vacuum pump. A manifold housing has an engine port pneumatically communicable with the engine, a separate booster port pneumatically communica... | 09/02/2003 |
| 6446432 | Hydraulic logic cross-coupling between physically-separate redundant servoactuators A redundant control actuation system (100) provides hydraulic logic cross-coupling between physically-separate servoactuators (101A, 101B). Each servoactuator has a control valve (102A, 102B) arranged to provide a hydraulic output in response to a control... | 09/10/2002 |
| 6173728 | Switching valve for a hydraulic power steering system A switching valve (50) for a hydraulic power steering system (10) includes a longitudinally movable valve spool (80). A spring (86) biases the spool (80) to a neutral position. The switching valve (50) is configured to direct hydraulic fluid from a primar... | 01/16/2001 |
| 6131389 | Hydrostatic steering device with two steering systems A hydrostatic steering device having substantially identical first and second steering systems, each including a pump connected to a steering unit, which is connected to a steering motor by two motor hoses. A steering wheel is common to both steering unit... | 10/17/2000 |
| 5888166 | Method and an apparatus for controlling a car equipped with an automatic transmission having a lockup clutch A method and an apparatus control a car equipped with an automatic transmission having a lockup clutch. When the lockup clutch is in the lockup state, a variation of a generated torque is detected. When the range of the torque variation detected exceeds a... | 03/30/1999 |
| 5881557 | Vacuum system for diesels and high performance vehicles A vacuum back-up system for diesel vehicles, and a primary vacuum system for high performance vehicles, which vacuum system includes a vacuum pump for creating a vacuum in an associated reserve vacuum tank connected to the vacuum booster of the vehicle. A... | 03/16/1999 |
| 5335926 | Hydraulic actuating apparatus for opening and closing a vehicle cover with auxiliary manual hydraulic pump A hydraulic actuating apparatus for opening and closing a movable cover (convertible top) of a vehicle includes a piston/cylinder device, a reversible, motor driven pump for supplying hydraulic fluid to the piston/cylinder device to cause it to open or cl... | 08/09/1994 |
| 5301505 | Fail safe linear actuator system A fail safe hydraulic system which includes a pressurized fluid storage which is capable of delivering fluid to the actuator to return it to its inoperative position should the actuator system suffer a loss of power and a apparatus for signaling a control... | 04/12/1994 |
| 5277020 | Hydraulically actuated aircraft engine control system A control system for hydraulically controlling variable engine structures is disclosed in which the control system utilizes hydraulic fluid identical to that used by the aircraft hydraulic control circuit. A high pressure hydraulic pump, driven by the air... | 01/11/1994 |
| 5201174 | Auxiliary hydraulic pump system An engine-driven pump supplies pressurized hydraulic fluid to vehicle brake and steering circuits. A ground driven variable displacement pump controlled by a control circuit is de-stroked when the engine-driven pump is operational. The variable displaceme... | 04/13/1993 |
| 5185999 | Hydraulic brake booster and valve members A hydraulic brake booster (10) includes a housing (12) which defines a pressure chamber (16) and a piston (18) within the housing (12) is movable in response to pressurized fluid within the pressure chamber (16) to effectuate a brake application. The pist... | 02/16/1993 |
| 5181380 | Hydrostatic operating mode hydraulic actuator preferably for backup operation, and flight control system comprising it An hydraulic actuator composed of a double-acting actuator, a mobile switching member disposed in a housing connected hydraulically to the actuator, two fluid inlet and outlet pipes and a control member adapted to command the mobile switching member to mo... | 01/26/1993 |
| 5022481 | Emergency power steering backup apparatus and method An emergency power steering backup apparatus is adapted for supplying a vehicle's power steering unit with an emergency supply of power steering fluid only when the vehicle's primary power steering pump fails to provide fluid under sufficient pressure whi... | 06/11/1991 |
| 4955195 | Fluid control circuit and method of operating pressure responsive equipment A fluid control circuit and method of operating equipment such as a blowout preventer having a two-way hydraulic piston and cylinder assembly. The circuit includes various features such as a dual pressure level independently controlled fluid supply, a ded... | 09/11/1990 |
| 4953445 | Control device with failure detection centering for a double-acting hydraulic jack The invention relates to the control of a hydraulic jack which can be used, for example, for controlling the orientation of the rear wheels of a vehicle with front guiding wheels. In the event of a failure in the supply of fluid under pressure to the cham... | 09/04/1990 |
| 4762195 | Hydraulic steering system An hydraulic steering system for a ground-engaging, self-powered vehicle, the system including an engine driven primary pump for pumping hydraulic fluid to the steering system when the vehicle engine is operating and a wheel-driven secondary pump for pump... | 08/09/1988 |
| 4736811 | Steering control system The steering system of some lightweight vehicles are electronically controlled and have a manually operated mechanical control as a backup. Such manual backup control would not be adequate for large earthmoving, construction and industrial type vehicles. ... | 04/12/1988 |
| 4731997 | Device for storing and releasing energy In a system with an energy storing and releasing device the latter comprises a high pressure accumulator and switching over device for the charging and discharging of the latter from and to a low pressure accumulator using a hydraulic transducer which is ... | 03/22/1988 |
| 4712375 | Safety device for priority hydraulic consumer In the supply of priority and lower-ranking consumers the flow to the priority consumer must be maintained even when there is a leak in the hydraulic system of the lower-ranking consumers. For this purpose the priority consumer is connected via in each ca... | 12/15/1987 |
| 4711089 | Hydraulic system for aircraft A hydraulic system for an aircraft to provide improved reserve capability for the thrust reverser power system. There is a fluid reservoir having a vent tube with an inlet location located above the bottom wall of the reservoir. In the event that fluid in... | 12/08/1987 |
