Patent ID: 6267040
Filing Date: 2001-07-31
Classification: B62D,F16F

Abstract:
A power steering device comprising:a pump for supplying a pressure fluid;a power cylinder having first and second chambers and driven in accordance with a pressure difference between a pressure fluid supplied to said first chamber and that to said second chamber;a flow channel selector valve for selectively switching a supply direction of the pressure fluid from said pump to said first and second chambers of said power cylinder in response to steering operation of a steering wheel;a first fluid path for connecting said flow channel selector valve and said first chamber of said power cylinder to each other;a second fluid path for connecting said flow channel selector valve and said second chamber of said power cylinder to each other;a first variable restrictor disposed in said first fluid path to control a flow rate of the pressure fluid from said power cylinder to said flow channel selector valve;a second variable restrictor disposed in said second fluid path to control a flow rate of the pressure fluid from said power cylinder to said flow channel selector valve;a first check valve connected to said first fluid path in parallel to said first variable restrictor to prevent a flow of the pressure fluid from said power cylinder to said flow channel selector valve; anda second check valve connected to said second fluid path in parallel to said second variable restrictor to prevent a flow of the pressure fluid from said power cylinder to said flow channel selector valve.