Patent ID: 6374967
Filing Date: 2002-04-23
Classification: F16F

Abstract:
A damping force control type hydraulic shock absorber comprising:a cylinder having a hydraulic fluid sealed therein; a piston slidably fitted in said cylinder; a piston rod connected at one end thereof to said piston, the other end of said piston rod extending to an outside of said cylinder; a hydraulic fluid passage for passing the hydraulic fluid in response to sliding movement of said piston; a damping force control valve for controlling damping force by controlling flow of the hydraulic fluid through said hydraulic fluid passage; and a mechanism for actuating said damping force control valve, wherein said damping force control valve is a variable pressure control valve comprising a cylindrical sleeve having an upstream port and a downstream port in the side wall thereof and a slider valve slidably received in the sleeve and including a valve member which controls flow of the hydraulic fluid between said upstream and down stream ports by the movement of said slider valve, said valve member having an upstream end portion and a downstream end portion, and wherein a hydraulic fluid chamber formed on the side of said downstream end portion of said valve member is cut off from said downstream port.