Fluid pressure control device in power steering apparatus

Claim 1

In a power steering apparatus connected to a pump and a cylinder and provided with an input shaft, an output shaft connected with one end of said input shaft, and a control valve rotatable about said input shaft so that fluid under pressure from the pump is selectively supplied to the cylinder upon relative displacement of said control valve to thereby power-assist the rotation of said output shaft to thereby actuate steering wheels of a vehicle, an oil pressure control device comprising: control means for pressing against the outer circumference of said input shaft; a throttle valve provided in a return circuit of said fluid from said power steering apparatus to said pump and controlled in accordance with the speed of the vehicle; and a fluid passage member connected between an inlet of said throttle valve and an inlet of said control means for guiding said fluid controlled by said throttle valve to said control means to thereby cause said conrol means to be pressed against said input shaft.