| 摘要 |
<p>A power steering control valve comprises a pair of rotatable elements respectively attached to input and to output members for controlling fluid flow toward first and second actuator chambers. A disc-shaped chamber having two end walls and a circumferential wall is defined by structure attached to one of the rotatable members. The other rotatable element is a star-shaped rotor coaxial with and rotatably mounted in the disc-shaped chamber, and includes a hub from which extends a plurality of legs cooperating with the walls of the disc-shaped chamber so as to separate the latter into a plurality of pressure chambers which are circumferentially distributed. Two consecutive pressure chambers communicate respectively with the first and second actuator chambers via first and second work passages. Two consecutive legs respectively face an inlet passage opening and an outlet passage opening. In a rest position of the control valve, each leg substantially closes fluid communication from a corresponding opening to the disc-shaped chamber. The star-shaped rotor moves in response to actuator of the input member so that each leg moves past its corresponding opening to allow substantially uninhibited fluid communication between the inlet passage and one of the actuation chambers and to restrict fluid communication between the outlet passage and the other actuation chamber.</p> |
