Motor vehicles – Steering gear – With fluid power assist
Patent
1998-11-23
2000-05-23
Hurley, Kevin
Motor vehicles
Steering gear
With fluid power assist
91375A, B62D 5065
Patent
active
060655615
ABSTRACT:
A vehicle power steering system comprising a power unit, a valve unit and a centering unit. A piston of the power unit reciprocates in a cylinder to provide power assisted steering and is engaged by a worm connected to the steering shaft for rotation in response to either the centering unit or the vehicle steering member. The valve unit is connected between the worm of the power unit and a steering shaft segment from the centering unit, and includes a rotary valve member rigidly fixed to the steering shaft segment and rotatably received in the bore of a sleeve member fixed to the worm. The sleeve member is connected to the rotary valve member through a torsion rod arranged to actuate a pair of spool valves formed by valving elements on the rotary valve member and the sleeve member. The spool valves are arranged to provide fluid flow to and from the power unit only while the steering shaft is being turned by either the steering member or the centering unit, so as to prevent uncontrolled return of the steering system toward its center position in response to road forces acting on the steerable wheels.
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