Trw Limited

Otis Pierson

Phillip A Bishop

A fluid power assist rack and pinion steering system ( ) for a vehicle having steerable wheels comprises a rack ( ) connected with steering linkage of the vehicle for, upon movement of the rack, moving the steering linkage to effect turning of the steerable wheels. A rotatable pinion ( ) is in meshing engagement with the rack ( ). The steering system ( ) also includes a control valve ( ) comprising a valve core ( ) rotatable relative to a valve sleeve ( ). A first part ( ) connects the valve sleeve ( ) for rotation with the pinion ( ). A mechanism ( ) resists relative rotation between the valve core ( ) and the valve sleeve ( ) as vehicle speed increases by placing axial force on the valve sleeve. A second part ( ) on the valve sleeve ( ) resists axial movement of the valve sleeve relative to the valve core ( ).

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Church Hill, TN, United States of America

Otis Pierson