Hydraulic systems

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B - Operations, Transporting

62

D

138/57

B62D 1/02 (2006.01) B62D 5/08 (2006.01)

Patent

CA 1099195

- 1 - ABSTRACT An hydraulic system: a power assisted vehicle steering system which includes such an hydraulic system and a method of alleviating noise in an hydraulic system. The hydraulic system as applied to a vehicle steering gear (1) has an open centre valve (3) which directs hydraulic fluid under pressure derived from a pump (12) and in response to a steering manoeuvre through a shaft (4) to a servo motor of the gear (1). Downstream of the open centre valve (3) is a restrictor (8) through which hydraulic fluid from the valve (3) passes to a reservoir (11). The restriction effected by the restrictor (8) to fluid flow from the valve (3) to the reservoir is variable to provide a throttling action and a back pressure in the line (6) to alleviate noise in the valve (3). The restrictor (8) is preferably in the form of a spool which is subjected to a pressure.

316320

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