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| Number | Title | Issue Date |
| 7070019 | Power assisted steering for all terrain vehicle An all terrain vehicle has a frame carried by a group of wheels. At least one of the wheels is steerably connected to the frame. A steering handle assembly is rotatably connected to the frame. A servo valve has an input shaft connected to the steering handle assembl... | 07/04/2006 |
| 7040090 | Servo steering system for motor vehicles For a power assisted steering system for vehicles, in particular passenger cars, there is provided a hydraulic circuit with a servopump, a three-way flow regulator valve which is located at the junction between the pump and a servoactuator and has a measuring thrott... | 05/09/2006 |
| 6929088 | Power steering system A power steering system includes a rotary slide valve which has a housing, an input shaft and an output shaft which can be rotated relative to each other to a limited extent. A centering piston is provided which is non-rotatably and axially movably connected with th... | 08/16/2005 |
| 6817438 | Apparatus and a method for adjusting fluid movement in a variable displacement pump A variable displacement pump is provided. A pump body has an outer ring defining an inner cavity, where the inner cavity further defines a pump suction path and a pump discharge path in fluid communication with the inner cavity. A cam ring is pivotably supported in ... | 11/16/2004 |
| 6470992 | Auxiliary solenoid controlled variable displacement power steering pump An auxiliary solenoid controlled variable displacement power steering pump, hydraulic systems incorporating same, and method for improving the efficiency of variable displacement power steering pumps. In one embodiment, a rotor is arranged within a pump b... | 10/29/2002 |
| 6397970 | Steering system An apparatus (10) for use in turning steerable vehicle wheels (12) includes a steering wheel (18) and a power steering motor (20) which is operated in response to rotation of the steering wheel. A first spring (120) is connected with the steering wheel (1... | 06/04/2002 |
| 6257364 | Submersible electro-hydraulic powerpack for underhood automotive steering applications An electro-hydraulic power steering system having a motor, a pump, and a control module all formed as an integral unit. The motor is shaft coupled to the pump and the pump housing and the motor housing are sealingly attached to prevent any fluid leakage. ... | 07/10/2001 |
| 6139045 | Wheel assembly having a mechanism to adjust the distance between the wheels A vehicle having a pair of front wheels coupled to a wheel assembly is provided. The wheel assembly includes a wheel-spacing mechanism, a pair of spaced-apart spindle assemblies, and a steering mechanism. The wheel-spacing mechanism includes a center axle... | 10/31/2000 |
| 6119803 | Power steering apparatus In a power steering apparatus having a control valve with a first control valve portion and a second control valve portion to enhance rigidity of a steering operation, an amount of an overlapping portion of an overlap variable orifice is designed larger t... | 09/19/2000 |
| 6098742 | Steering apparatus An apparatus for use in turning steerable vehicle wheels (14, 16) includes first and second pistons (42, 44) which cooperate with a housing (46) to define first and second chambers (38, 40). A rotatable screw member (84) extends from one of the chambers (... | 08/08/2000 |
| 6092012 | Power steering device A power steering apparatus for generating a steering assist force by a hydraulic pressure generated by a pump driven by an electric motor. The apparatus includes: a steering torque detecting mechanism (13) for detecting a steering torque; a steering urgen... | 07/18/2000 |
| 5803201 | Hydraulic power steering gear assembly with unloading valve A hydraulic power steering gear assembly includes an assembly body defining a piston chamber having opposed chamber ends with plunger passages formed in the ends, a reciprocating piston and a chamber having opposed ends and a passage extending between the... | 09/08/1998 |
| 5769178 | Power steering system for vehicle The power steering system for a vehicle includes a steering wheel, a torsion bar fixed to the steering wheel to rotate therewith, a hydraulic control unit for controlling hydraulic pressure generating from an oil pump in accordance with the rotation of th... | 06/23/1998 |
| 5598897 | Power steering device A power steering device for automobile type vehicles having a hydraulic power cylinder for assisting in steering front end wheels of the vehicle. The hydraulic power cylinder has a piston and piston rod fixed thereto reciprocable in two opposite direction... | 02/04/1997 |
| 5593002 | Power steering system equipped with means for varying an assist torque thereof The hydraulic power steering system comprises a rotary valve unit actuated according to a twisting angle provided in a torsion bar connected between an input shaft and a pinion, and a conversion mechanism which can change the condition of the rotary valve... | 01/14/1997 |
| 5582265 | Power steering assembly A hydraulic power rack and pinion steering assembly (10) includes a valve core (98) and a valve sleeve (100) which are supported for relative rotation. A damping ring assembly (150) is interposed between the valve core (98) and the valve sleeve (100) to r... | 12/10/1996 |
| 5558177 | Power steering apparatus A power steering apparatus including an electric motor for operating a hydraulic pump which supplies pressurized fluid, a directional control valve of center-closed type operable by a steering wheel for delivering the pressurized fluid supplied by the hyd... | 09/24/1996 |
| 5538096 | Rotary slide valve for auxiliary power steering systems in motor vehicles A rotary slide valve (1) for auxiliary power steering systems in motor vehicles contains in a valve borehole (5) of a valve housing (2) a rotary slide (4) that is connected with a steering spindle connection (23). In an axial borehole (6) of the rotary sl... | 07/23/1996 |
| 5515938 | Hydraulic power steering apparatus A power steering apparatus having a fluid source for discharging pressurized fluid, a power cylinder, a control valve responsive to operation of a steering wheel for supplying the power cylinder with pressurized fluid from the fluid source, and a reservoi... | 05/14/1996 |
| 5513720 | Power steering apparatus for vehicle A power steering apparatus for a vehicle including a steering mechanism having a torsion bar, a rotary valve connected to an oil pump and disposed between an input shaft and an output shaft, a valve driving mechanism having a pressed portion projected on ... | 05/07/1996 |
| 5505275 | Power steering system A power steering system (10) for a motor vehicle having a power cylinder with the piston mounted in the power cylinder which divides the power cylinder into first (30) and second (32) chambers. The steering system includes a valve assembly having a rotary... | 04/09/1996 |
| 5469929 | Motor vehicle power steering gear A motor vehicle power steering gear having a spool shaft connected to a steering wheel, a pinion head connected to a steered wheel, a torsion bar between the spool shaft and the pinion head, a control valve for regulating a hydraulic steering assist boost... | 11/28/1995 |
| 5462132 | Motor vehicle power steering gear A motor vehicle power steering gear having a spool shaft connected to a steering wheel, a pinion head connected to a steered wheel, a torsion bar between the spool shaft and the pinion head, a valve for regulating a hydraulic steering assist boost pressur... | 10/31/1995 |
| 5450916 | Power-assisted steering device An auxiliary power source, for example, an electric motor, supplies the power assist for a steering unit via a worm gear (15, 16). The worm gear (15, 16) drives clutch hubs (22 and 23) in the opposite rotational directions. The auxiliary power can be tran... | 09/19/1995 |
| 5445240 | Permanent magnet assembly A permanent magnet assembly for an electromagnetic mechanism in a motor vehicle power steering gear includes a metal ring having a plurality of radially oriented permanent magnets defined thereon and a plastic retaining hub attached to the metal ring. The... | 08/29/1995 |
| 5439070 | Hydraulic power steering apparatus A power steering apparatus having a hydraulic pump for outputting a pressurized fluid, an assist force generation mechanism hydraulically connected to the pump through a supply passage to generate an assist force in response to rotation of a steering whee... | 08/08/1995 |
| 5396969 | Servo control, especially power steering for motor vehicles The invention relates to a servo control, especially a power steering for motor vehicles, with a fluidic reaction control which is designed in the manner of a rotary slide and which constitutes a component which can fundamentally be separated from a servo... | 03/14/1995 |
| 5392875 | Hydraulic reaction variable assist power steering system A power steering system for automobiles comprising a rotary, driver-operated valve which is adapted to control pressure distribution from a steering pump to power-assist fluid motors and to a set of transversely disposed fluid pressure reaction pistons an... | 02/28/1995 |
| 5291963 | Power steering system A power steering control valve includes relatively rotatable inner and outer valve members. A power steering resistance control system resists relative rotation between the inner and outer valve members with a force which varies as a function of variation... | 03/08/1994 |
| 5287792 | Hydraulic power steering gear with noise attenuation A hydraulic power steering apparatus (10) comprises a rotatable input member (31), a rotatable output member (130), and a housing supporting (11) the input member (31) and the output member (130) for rotation about an axis (45) relative to each other. A h... | 02/22/1994 |
| 5213174 | Power steering assembly A hydraulic power rack and pinion steering assembly includes a modular control valve assembly. The modular control valve assembly can be assembled and tested at a location remote from a separate rack housing. The modular control valve assembly comprises a... | 05/25/1993 |
| 5115879 | Centering device for a servo valve of a power steering device A power steering device comprising an input shaft connected to a steering shaft, an output shaft connected to a rack for driving vehicle wheels, a servo valve including a valve sleeve surrounding the input shaft and engaging the output shaft, and a torsio... | 05/26/1992 |
| 5070957 | Variable effort automotive power steering gear A variable effort automotive power steering gear including an input or stub shaft, an output shaft or pinion head, a torsion bar between the stub shaft and pinion head defining an open-center position of one relative to the other, and detent reaction appa... | 12/10/1991 |
| 5069301 | Vehicle power assisted steering system A vehicle power assisted steering system comprises a hydraulic pump 24 having a constant volume output communicating with an open center power assistance valve 40 which is adjustable from a neutral condition in response to a steering input torque during a... | 12/03/1991 |
| 5058696 | Variable effort automotive power steering gear and method A variable effort automotive power steering gear including an input or stub shaft, an output shaft or pinion head, a torsion bar between the stub shaft and pinion head defining an open-center position of one relative to the other, and detent reaction appa... | 10/22/1991 |
| 5048630 | Power steering trim control system A power steering trim control system for use with steering mechanisms provided in automotive vehicles. The trim system includes a flow distribution valve (38) which selectively directs fluid pressure to segregated groups (34, 36) of valve lands (32) of a ... | 09/17/1991 |
| 5046573 | Automotive power steering system An automotive power steering system including a power steering gear with detent reaction and a control system for the detent reaction. The detent reaction includes an annular collar in a detent pressure chamber, radially shiftable detent balls on a pinion... | 09/10/1991 |
| 5046574 | Automotive power steering gear An automotive power steering gear includes a stub shaft, a pinion head, a torsion bar between the stub shaft and pinion head, and a detent reaction arrangement for varying the threshold manual effort required to initiate power assist and/or for varying th... | 09/10/1991 |
| 4905782 | Steering valve for vehicles A steering valve for vehicles has a torque input member for connection to a steering wheel and connects through a torque rod to an output shaft, having coacting valving components operated by relative rotation during the initial torque stress on the steer... | 03/06/1990 |
| 4877100 | Hydraulic reaction force apparatus for power steering system A hydraulic reaction force apparatus for a power steering system includes input and output shafts, a flange, balls, a reaction force receiving portion, a hydraulic reaction force chamber, and an annular reaction force piston. The input and output shafts a... | 10/31/1989 |
