Trw Limited

Robert S Betros

Jon W Martin

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 hydraulic control valve assembly (30) in the housing (11) includes a valve core (40), a valve sleeve (41) and a plurality of hydraulic seals (120-126) which block leakage of hydraulic fluid from the valve assembly (30). The hydraulic power steering apparatus (10) further includes an elastomeric damping ring (200) extending circumferentially between the valve core (40) and the valve sleeve (41). The elastomeric damping ring (200) damps vibrations of the valve core (40) relative to the valve sleeve (41), and thereby attenuates noise in the apparatus (10).

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Hermosa Beach, CA, United States of America

Robert S Betros