Patent ID: 7905316

Claim:
A clutch device of an oil pump in a power steering system, comprising: a pulley shaft coupled with a pulley connected with a crankshaft of an engine via a belt; a body shaft coupled with a rotor rotatably installed in a pump body and provided with a vein; clutch plates provided in the pulley shaft and the body shaft, and transmitting a rotation power of the pulley shaft to the body shaft or blocking the rotation power therebetween; an elastic member provided in the body shaft and offering elastic force to the clutch plates to transmit the rotation power of the pulley shaft to the body shaft; a check valve installed on a supply port connecting an airtight space in the pump body in which the clutch plates are installed with a discharge port discharging oil pressure from the pump body; a solenoid valve installed on a return port selectively connecting the airtight space in the pump body with an input port through which oil is supplied to the pump body; and a controller receiving a signal from a sensor detecting a driver's steering will to control the operation of the solenoid valve.