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| Number | Title | Issue Date |
| 7325645 | Power steering device A first fluid passage extends from a first outlet/inlet port of a hydraulic pump to a first work chamber of a power cylinder, and a second fluid passage extends from a second outlet/inlet port of the pump to a second work chamber of the power cylinder. A switch syst... | 02/05/2008 |
| 7232007 | Method for operating a power-assisted hydraulic steering system in a motor vehicle A method of operating a power-assisted hydraulic steering system of a motor vehicle having a hydraulic pump mechanically driven by a vehicle drive assembly, and having an additional function which reduces the amount of power assistance at a high driving speed in com... | 06/19/2007 |
| 7186101 | Gerotor apparatus for a quasi-isothermal Brayton cycle Engine According to one embodiment of the invention, a gerotor apparatus includes an outer gerotor having an outer gerotor chamber, an inner gerotor, at least a portion of which is disposed within the outer gerotor chamber, and a synchronizing apparatus operable to control... | 03/06/2007 |
| 7159525 | Hydraulic steering arrangement The invention concerns a hydraulic steering arrangement with a steering motor, a supply path between a pressure source and the steering motor, in which supply path a throttling device and a measuring motor are located, a return path between the steering motor and a ... | 01/09/2007 |
| 7155905 | Power steering apparatus A power steering apparatus includes a hydraulic power cylinder, and a reversible pump driven by a motor. A steering assist sensor senses a steering assist force provided to a steering wheel. A controller ascertains a pump discharge quantity of the reversible pump, a... | 01/02/2007 |
| 7124855 | Flow controlling apparatus for power steering A flow controlling apparatus for a power steering system includes a variable throttle mechanism installed in the pump to change the flow rate of discharged oil from the pump to a hydraulic device; a linear solenoid mechanism controlling the variable throttle mechani... | 10/24/2006 |
| 7111457 | Diagnostic system for a hydrostatic transmission or transaxle An improved diagnostic system for a hydrostatic apparatus such as a hydrostatic transmission or transaxle is disclosed. A fastener having a port formed therein is used to connect a hydraulic component such as a center section to a housing. A diagnostic system may be... | 09/26/2006 |
| 7036625 | Integrated hydraulic control system An integrated hydraulic control system includes a steering control unit and a priority flow divider integrated into a unitary casing. An interface fluidly couples the casing for the steering control unit and priority flow divider directly to a control valve casing. ... | 05/02/2006 |
| 7028469 | Leakage compensation arrangement in a control device for a fully hydraulic steering system A leakage compensation system in a control device (S) has a fully hydraulic steering system (1) with a supply connection arrangement having a high-pressure connection (P) and a low-pressure connection (T). A working connection arrangement has two working conn... | 04/18/2006 |
| 7000892 | Pneumatic servo valve The present invention relates to a pneumatic servo valve, and more particularly, to a pneumatic servo valve, wherein displacement of a spool due to flow force of a fluid is prevented by firmly holding the spool just after position control for the spool is completed,... | 02/21/2006 |
| 6978858 | Visual reference control apparatus for hydraulic actuator systems A control apparatus for controlling movement of a hydraulic actuator of a hydraulic control system associated with, for example, an off-road vehicle or a vessel. A geared transmission adapted to be connectable to a support member has rotatable input and output shaft... | 12/27/2005 |
| 6971472 | Fully hydraulic steering The invention concerns a fully hydraulic steering with a steering member, a steering unit that can be activated by the steering member, said steering unit comprising a supply connection arrangement (P, T) with a pressure connection (P) and a tank connection (T), and... | 12/06/2005 |
| 6945352 | Force-based power steering system Apparatus and method is presented for enabling a power steering system comprising an accumulator, a reservoir, and an electronically controlled closed-center control valve assembly for selectively fluidly coupling the accumulator and reservoir to a double-acting pow... | 09/20/2005 |
| 6923290 | Closed circuit steering circuit for mobile vehicle A closed-circuit pump is provided that receives input from a steering unit in order to drive a steering cylinder. The closed-circuit pump is preferably a proportional bi-directional pump. The steering unit includes a steering wheel or similar device controlled by an... | 08/02/2005 |
| 6923289 | Closed circuit steering circuit for mobile vehicles A closed-circuit pump is provided that receives input from a steering unit in order to drive a steering cylinder. The closed-circuit pump is preferably a proportional bi-directional pump. The steering unit includes a steering wheel or similar device controlled by an... | 08/02/2005 |
| 6912455 | Vehicle steering system and method of steering A method for steering a vehicle, in which a steering motor (4) is activated in dependence of the activation of a steering member (1), a steering motor angle and a steering member angle are detected and an error in the correlation between the steering m... | 06/28/2005 |
| 6863147 | Hydrostatic power steering device for fast steering Hydrostatic power steering device comprising a source of pressurized fluid, a cylindrical barrel-type distributor the elements of which are connected elastically together, and of which the inner element, the so called spindle, is connected to the steering wheel; the... | 03/08/2005 |
| 6804956 | Hydraulic steering system A hydraulic steering system (1) with a supply connection arrangement, having a high-pressure connection (P) and a low-pressure connection (T), and with a working connection arrangement (L, R), a directional valve (2) and a metering pump unit (3, 4 | 10/19/2004 |
| 6769451 | Power beyond steering unit with bypass An open center fluid controller (15) controls the flow from a pump (11) to a steering cylinder (17) and to a downstream auxiliary device (99) requiring a predetermined minimum flow availability. The open center fluid controller (15... | 08/03/2004 |
| 6769249 | Low slip steering system and improved fluid controller therefor A fluid controller (27) for use with a fluid pressure operated device (45) having an inlet (47) and an outlet (49) and defining a fluid leakage path therebetween. The controller (27) includes valving (61) defining a main flu... | 08/03/2004 |
| 6578356 | Method and arrangement for hydraulic steering Disclosed herein is a method for hydraulic steering. The method includes supplying a steering unit with a controlled working pressure from a load signal line dependent upon a load signal. The load signal being generated via a load signal fluid having a fl... | 06/17/2003 |
| 6560961 | Steering system with ability to stop steering wheel rotation A full fluid-linked steering system includes a fluid pump (11), a fluid controller (19), a steering actuator (17), an electro-hydraulic compensation valve (21), and a vehicle microprocessor (23). Downstream of the fluid pump (11) is a load sensing priorit... | 05/13/2003 |
| 6539710 | Hydrostatic steering system having improved steering sensing A hydrostatic steering system of the type including a fluid controller (21) for controlling the flow of fluid from a source (11) to a steering actuator (19) in response to movement of a steering wheel (W). The controller (21) is of the type having a fluid... | 04/01/2003 |
| 6490861 | Hydraulic steering system A hydraulic steering system for a tractor is provided which can be operated in a conventional steering mode or in a fast steering mode. In conventional steering mode, a conventional steering wheel and steering motor direct pressurized oil to the steerable... | 12/10/2002 |
| 6484840 | Hydraulic steering arrangement A hydraulic steering arrangement with a directional valve and a metering pump unit having two hydraulically parallel connected and mechanically parallel operable metering pumps, each having a toothed ring with inner toothing and a gear wheel with outer to... | 11/26/2002 |
| 6427722 | Rotary slide set for a hydraulic steering arrangement The invention concerns a rotary slide set for a hydraulic steering arrangement with an outer rotary slide and an inner rotary slide arranged in the outer rotary slide, and having in its surface tank grooves, which are, at least in predetermined rotary pos... | 08/06/2002 |
| 6318078 | Fluid controller and fluid meter bypass arrangement A fluid controller (17) to control flow to a steering cylinder (19) is modified to include a selector valve assembly (41,73) having two operating positions. In a first position ("R" in FIG. 1), the selector valve (73) permits fluid flow though the main fl... | 11/20/2001 |
| 6237331 | Hydraulic steering arrangement The invention relates to a hydraulic steering arrangement (1) with a housing (4), in which an inner control slide (7) and an outer control slide (6) are arranged to be mutually rotational, forming together a variable flow path device between a supply conn... | 05/29/2001 |
| 6213247 | Hydraulic steering device and method for steering a vehicle A hydraulic steering device, in particular for vehicles, is disclosed, having a housing in which two sliders are arranged to move relative to one another and together form at least one adjustable throttle, a restoring device for restoring the two sliders ... | 04/10/2001 |
| 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 |
| 6076349 | Hydrostatic automotive or high speed steering system A full fluid-linked steering system, especially for use in on-highway steering, in which the system includes a fluid controller (21) including a fluid meter (65) operable to provide follow-up movement to controller valving (87,89), in response to the flow... | 06/20/2000 |
| 6016656 | Hydraulic control device A hydraulic control device is disclosed, having a pressure connection and a tank connection and having a metering pump unit (4) that comprises at least two metering pumps (5, 6) connected hydraulically in parallel and operable mechanically in parallel and... | 01/25/2000 |
| 5992458 | Load reaction steering unit for unequal area cylinder A fluid controller (15) of the type which controls the flow of fluid to an unequal area steering cylinder (25), wherein the controller is of the load reaction type. The controller (15) includes valving (27) which, when it is in neutral (FIGS. 1 and 5), de... | 11/30/1999 |
| 5975138 | Fluid controller with improved follow-up A fluid controller (15) of the type having a primary, spool valve (43) and a followup, sleeve valve (45) which define a relative neutral position (FIG. 1) and first and second maximum, opposite operating positions (L and R). The controller includes a flui... | 11/02/1999 |
| 5970708 | Hydraulic steering assembly with change in transmission ratio and flow amplification In order to continuously change the transmission ratio between power-assisted steering mode and emergency steering mode and to maximize the flow of hydraulic oil in the power-assisted steering mode when the steering wheel is rapidly turned, a steering ass... | 10/26/1999 |
| 5960694 | Hydrostatic power steering system having reduced wheel slip A hydrostatic power steering system comprising a fluid motor (19) which receives pressurized fluid from a controller (17) in response to the rotation of a vehicle steering wheel (W). As the motor (19) or the steered wheels reach the stops, control logic (... | 10/05/1999 |
| 5947228 | Hydraulic power steering system for a vehicle A hydraulic power steering system for a vehicle comprising a hydraulic fluid displacement pump, operated by a thermal engine of the vehicle and provided with a suction port and a delivery port, a reservoir for collecting said fluid, connected to suction p... | 09/07/1999 |
| 5887429 | Hydraulic steering system with load signal Conventional steering systems of this type have the disadvantage that the dynamic load signal flow is lossy which has a negative effect on the energy efficiency. Another disadvantage arises in steering systems with a closed-center design. When the steerin... | 03/30/1999 |
| 5873243 | Torque generator steering device A torque generator steering device (11) including a gerotor gear set (17) disposed adjacent an end cap (15) and having the input shaft (21) extending through the end cap and through the orbiting and rotating star member (31). The valving of the device, in... | 02/23/1999 |
| 5819532 | Dynamic load signal fluid controller with instant on flow amplification A fluid controller (17) of the dynamic load sensing and flow amplification type, and including a main fluid path (35,39) having a main variable flow control orifice (43), and a fluid meter (37). Dynamic signal fluid enters a load sensing port (29) of the ... | 10/13/1998 |
