Patent ID: 6736047
Filing Date: 2004-05-18
Classification: B62D

Abstract:
A power steering device installed between a steering shaft rotatably installed at a chassis frame and a steering wheel connected to the steering shaft, the power steering device comprising:a cylindrical holder coaxially arranged on said steering shaft; a cylindrical rotary cylinder coaxially and rotatably installed in the holder and forming two oil chambers spaced apart in a circumferential direction between the cylindrical rotary cylinder and an inner surface of the holder; and a spool changing-over member coaxially and rotatably inserted in the rotary cylinder and connected to said steering wheel, wherein said holder is provided with an operating oil supply hole and an operating oil discharging hole, said rotary cylinder is formed with a pair of communicating holes between each of said oil chambers and an inside of said rotary cylinder, said spool changing-over member is formed with operating oil passages where a space part between the spool changing-over member and an inner circumferential surface of said rotary cylinder is divided into two segments in a circumferential direction and connected with said supply holes and discharging holes, and a pair of partition walls are provided for changing-over communicating state between said pair of operating oil passages and said pair of communicating holes under a relative rotation with said rotary cylinder.