| 摘要 |
An apparatus for use in a vehicle to control a flow of fluid to a power steering motor includes inner and outer valve members (40 and 42) which are disposed in a housing (44) and are rotatable relative to each other to control fluid flow to a power steering motor (31). A force transmitting assembly (114) is provided to resist relative rotation between the inner and outer valve members (40 and 42) with a force which varies as a function of variations in force applied against the force transmitting assembly. An actuator member (130) is provided to apply force against the force transmitting assembly (114). A power steering resistance control system (110) includes a coil (128) which provides a magnetic field which acts on the actuator member (130). A speed responsive control unit (112) is effective to vary the strength of the electromagnetic field provided by the coil (128) with variations in vehicle speed to thereby vary the force which is transmitted through the actuator member (130) to the force transmitting assembly (114) as a function of variations in vehicle speed.
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