Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8127541 | Working fluid cooling control system for construction machine A working fluid cooling control system has a controller 100 that receives inputs signals from a traveling motor speed pickup 101, a pressure sensor 102, a signal receiving line 103a of an option selecting switch 103 and a te... | 03/06/2012 |
| 8051649 | Hydraulically driven industrial machine A hydraulically driven industrial machine having a variable displacement type hydraulic pump adapted to take in and pressurized working oil from an working oil tank, a hydraulic actuator to be driven by pressurized working oil delivered from the hydraulic pump throu... | 11/08/2011 |
| 7886532 | Compressed air supply device for a utility vehicle A compressed air supply device is provided for a utility vehicle, having a compressor which can be driven by a drive via a pneumatically switchable clutch, and a valve which can be activated by an electrical signal in order to optionally feed compressed air to a swi... | 02/15/2011 |
| 7832206 | Systems and methods for controlling automatic transmission fluid Systems and methods of controlling automatic transmission fluid (ATF) in a vehicle include torque converter systems generally having a pump, a turbine and a stator. The stator is selectively rotated during periods of predetermined low ATF temperature, thereby causin... | 11/16/2010 |
| 7827785 | Hydraulic system with warm up circuit A hydraulic control system in which a pump for pressurized hydraulic fluid connects with a valve assembly having a valve element displaceable in a chamber to selectively direct fluid to a load driven by the hydraulic system. Surfaces on the end faces of the valve el... | 11/09/2010 |
| 7802425 | Method for controlling or regulating the air pressure in a compressed air supply device A method is provided for controlling and/or regulating the air pressure in a compressed air supply device for a utility vehicle. At least one pressure value in the compressed air supply device and/or in vehicle components connected to the compressed air supply devic... | 09/28/2010 |
| 7797933 | Servo system augmented with an active material component A servo system includes pressurized fluid, and one or more fluid control devices (FCD) such as a valve or actuator, with at least one FCD having an element with a variable property that varies in response to a stimulus. The FCD controls a flow rate or pressure trans... | 09/21/2010 |
| 7617676 | Hydraulic control apparatus for vehicular fluid-actuated power transmitting device provided with lock-up clutch A hydraulic control apparatus for a vehicular fluid-actuated power transmitting device provided with a lock-up clutch and an oil cooler, the lock-up clutch being operable between an engaged state and a released state according to a difference between pressures of a ... | 11/17/2009 |
| 7421840 | Energy conversion and dissipation system A hydraulic energy conversion and dissipation system comprises a hydraulic retarder pump driven by a source of a mechanical energy needed to be dissipated for converting the mechanical energy into a waste hydraulic energy, a hydraulic flow retarder provided for conv... | 09/09/2008 |
| 7409827 | Working vehicle There is provided a working vehicle including: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump case accommodating the hydraulic pump main body and having an inner space capable of storing oil; a hyd... | 08/12/2008 |
| 7331760 | Fan revolution speed control method Actual temperatures of intake air, hydraulic oil, and coolant, to be cooled by a cooling fan, are detected. Target fan revolution speeds are determined by PI control units based on differences between the actual temperatures and target temperatures. The cooling fan ... | 02/19/2008 |
| 7310986 | Method for producing a compensation collar for an injection valve The positioning of the actuating drive in a fuel injector with a piezoactor (2) that is screwed into the housing (1) of the fuel injector is performed by applying a voltage (U) to the piezoactor (2) that corresponds to a given idle stroke (h), a... | 12/25/2007 |
| 7287374 | System and method for controlling viscosity of a fluid and a working vehicle containing such a system The invention relates to a method and system for controlling viscosity of a hydraulic fluid. The viscosity of a hydraulic fluid is usually very much dependent on temperature. By using existing throttles which generate a pressure drop, the hydraulic fluid can be heat... | 10/30/2007 |
| 7281370 | Fan revolution speed control method Temperature of each cooling target fluid is detected. When the flow rate of a cooling target fluid passing through a cooling system is high, the fan revolution speed of a cooling fan of the cooling system is controlled to achieve a target fan revolution speed so tha... | 10/16/2007 |
| 7275368 | Fan revolution speed control method The invention is a fan revolution control method for controlling a pump-motor system, by controlling the fan revolution speed of a cooling fan adapted to be rotated by a fan motor to cool cooling target fluids. The pump-motor system drives the fan motor by a hydraul... | 10/02/2007 |
| 7258640 | Apparatus for compensating viscous characteristics of hydraulic fluid in a hydraulic pressure line An apparatus for compensating the viscous characteristics of a hydraulic medium in a pressure line (10) in which apparatus a pressure nozzle (12) with constant geometry and constant through-flow cross-section is located in the pressure line (10)... | 08/21/2007 |
| 7259471 | Drive line for fluid flow power engine with speed guidance, power impact reduction and short-term energy storage Control procedure for a flow machine, wherein the flow machine comprises a turbine, which picks up power from a wind or water current, and a driveline, which transfers power from the turbine to an electric generator connected to an electricity grid of constant grid ... | 08/21/2007 |
| 7231764 | Exchange and/or scavenging device for a circuit comprising at least one hydraulic motor The device comprises a replenishing valve (24) having an opening control chamber suitable for being connected to a main duct (12, 14) of the circuit, and a closing control chamber, the pressure in said chambers making it possible to cause the moving me... | 06/19/2007 |
| 7207173 | Method and apparatus for warm up control of autonomous inverter-driven hydraulic unit An apparatus for warm up control of an autonomous inverter-driven hydraulic unit has a warm up control section and a switch section. The warm up control section performs a predetermined process using a current speed and current pressure as input information and outp... | 04/24/2007 |
| 7204085 | Power source derating component protection system A protection system is provided for a work machine with a power source. At least one sensor is configured to monitor a fluid parameter of a work machine system external to the power source. The sensor is further configured to produce a signal indicative of a value o... | 04/17/2007 |
| 7165950 | Two-stage pressure relief valve A two-stage pressure relief valve for use with hydraulic systems is disclosed. The two-stage pressure relief valve has a first stage that relieves increases in hydraulic system pressure over the normal operating pressure and up to a selected threshold pressure level... | 01/23/2007 |
| 7159506 | State detecting device for load element receiving load of working fluid and state detecting device for fluid pressure control circuit The load element state detecting portion 72 detects the completion of the filling of the hydraulic oil into the clutch 62 and the working limit of the accumulator 64 on the basis of the displacement of the spool valve element 42. That is,... | 01/09/2007 |
| 7155907 | Electro-hydraulic fan drive cooling and steering system for vehicle An electro-hydraulic system for operating a cooling fan and providing hydraulic fluid to a power steering system of the vehicle includes a hydraulic pump unit including first and second fixed displacement pumps and a common drive shaft for these pumps. A hydraulic f... | 01/02/2007 |
| 7149615 | Absolute steering angle detection device and absolute steering angle detection method for electric power steering device A steering angle θt detected by the torque sensor is read at S900. Then, an electrical angle θm corresponding to a motor rotational angle is read at S902. At S908 through S922, motor rotational numbers are calculated based on θt, θm a... | 12/12/2006 |
| 7121389 | Oil system The invention relates to an improved system for supplying filtered oil to wet brakes of the tractor without additional/auxiliary pump. The system comprises of a suitably sized connection provided on the drain line of the Hydraulic system, which supplies required qua... | 10/17/2006 |
| 7096772 | System and method for controlling hydraulic fluid flow A method of flowing hydraulic fluid in a work machine is disclosed. The method includes generating a control signal from an input mechanism and generating a property signal indicative of a viscosity of the hydraulic fluid. The control signal and the property signal ... | 08/29/2006 |
| 7082758 | Hydraulic machine, system for monitoring health of hydraulic machine, and method thereof In a hydraulic machine, hydraulic pump failure is detected and the pump lifespan is estimated before the pump failure occurs. The discharge pressure 122, oil temperature 126, and drain filter differential pressure 120 are measured, a correlative... | 08/01/2006 |
| 7077224 | Hybrid vehicle and method of controlling the same When a starter switch is switched from OFF to ON, a hybrid ECU determines that a driver intends to start driving a vehicle, reads a temperature of each of items (engine coolant, injectors, lubricating oil, and the like), and makes a determination on the necessity of... | 07/18/2006 |
| 7077050 | Pneumatic brake booster, particularly for a motor vehicle Pneumatic brake booster, in particular for a motor vehicle, comprising a reaction disk (30) interposed between a plunger (28) carried by a control rod actuated by the brake pedal and a thrust rod (32) acting on the primary piston of a tandem mas... | 07/18/2006 |
| 7055316 | Fluid coupling for mobile equipment In an assembly including a diesel engine, a fluid coupling connected to the flywheel of the diesel engine, a comminuting machine and a conveyor for feeding the comminuting machine, a fluid coupling module is common to various output power train assemblies. Slip spee... | 06/06/2006 |
| 7032497 | Vacuum brake booster Vacuum brake booster for motor vehicles comprising a booster housing whose interior is subdivided by a movable wall into a vacuum chamber and a working chamber, a control valve that controls a pressure difference acting upon the movable wall and is accommodated in a... | 04/25/2006 |
| 7017342 | Air compressor and control method therefor An air compressor includes a tank unit storing a compressed air used by a pneumatic tool, a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit, a motor driving the compressed air generator, a drive portion in... | 03/28/2006 |
| 7001100 | Monolithically formed one-piece reflective pavement marker A reflective pavement marker having a structural body and at least one retro-reflective face. The pavement marker having angled sides, each having a designated lower impact region, and a slanted finger grip region. The marker further having a base sealing sheet with... | 02/21/2006 |
| 6994102 | Pressure regulating valve A pressure regulating valve which is comprised of a valve body being comprised of a cylinder, a spool slidably disposed in the cylinder with a clearance, the spool and the cylinder defining a pressure chamber and a space portion, and an urging member which urges the... | 02/07/2006 |
| 6966180 | Control arrangement and method for a hydraulic system A control arrangement for a hydraulic system is disclosed. The system comprises a variable displacement hydraulic pump (4), which is connected with a hydraulic drive motor (16) by a supply line (11) and a return line (12). The system also... | 11/22/2005 |
| 6951101 | Method and device for controlling a hydrodynamic clutch A method for controlling and filling a hydrodynamic clutch. A set variable can be preset for a variable which at least indirectly characterizes the functional state of the hydrodynamic clutch and which serves as an input variable of a control device assigned to the ... | 10/04/2005 |
| 6766643 | Wind and wave energy plant A wind and wave energy plant (1) comprises a windmill with a rotor (3) and a wave-actuated water pump that can drive a turbine whose output shaft is in driving connection with an electric generator. The windmill includes a tubular mill tower (2)... | 07/27/2004 |
| 6764286 | Piston pump with pump inlet check valve A piston pump comprises cylinder attached within a cavity of a pump housing. An outlet check valve seat is defined about an outlet of the cylinder. A piston is slidably received in a bore of the cylinder and has a first passageway formed therein. A cylinder head enc... | 07/20/2004 |
| 6655135 | Construction machine In a construction machine according to the present invention wherein there is made an engine speed sensing control to control a pump horsepower in accordance with an engine speed of an engine, there is performed, in a low temperature condition with hydrau... | 12/02/2003 |
| 6634172 | Thermal contraction control apparatus for hydraulic cylinders A method and apparatus for operating a load lifting device to move a load and hold the load steady is disclosed. In the conventional arts, a lifted or lowered suspended load had a tendency to move from its desired position, as hydraulic fluid in the lifti... | 10/21/2003 |
