Patent ID: 6371262
Filing Date: 2002-04-16
Classification: F16F

Abstract:
A damping force control type hydraulic shock absorber comprising:a cylinder in which a hydraulic fluid is to be sealably contained; a piston slidably received within said cylinder; a piston rod having one end connected to said piston and an opposite end extending outwardly from said cylinder; a main fluid passage and a sub fluid passage in fluid communication with said cylinder, such that upon a sliding movement of said piston within said cylinder the hydraulic fluid is allowed to flow through said main fluid passage and sub fluid passage; a pilot type damping valve in said main fluid passage; and a fixed orifice and a pressure control valve within said sub fluid passage, such that a pressure of the hydraulic fluid in said sub fluid passage between said fixed orifice and said pressure control valve can be applied to said pilot type damping valve as a pilot pressure, wherein said pressure control valve includes a valve chamber between a cylindrical sleeve and a slider that is slidably received within said cylindrical sleeve, whereby a thrust of said slider is to be generated due to a difference between pressure-receiving areas of said slider within said valve chamber, which pressure-receiving areas are to receive a pressure that is to act in an axial direction of said slider, and wherein a valve opening pressure is to be controlled in accordance with a balance between the thrust of said slider and a thrust of a solenoid.