Patent ID: 6155391
Filing Date: 2000-12-05
Classification: B60G,F16F

Abstract:
A hydraulic shock absorber of a damping force adjustable type comprising a cylinder having an oily fluid filled therein, a piston slidably disposed in said cylinder, a piston rod having one end thereof connected to said piston and an other end thereof extending outside of said cylinder, a main oily fluid passage and a subsidiary oily fluid passage that are each connected to said cylinder and conduct oily fluid in response to sliding movement of said piston, a pilot type damping valve disposed in said main oily fluid passage, a fixed orifice in said subsidiary oily fluid passage and a pressure control valve, wherein the pressure between said fixed orifice of said subsidiary oily fluid passage and said pressure control valve acts as a pilot pressure for said pilot type damping valve, and wherein said pressure control valve comprises a solenoid control valve including a disc valve and a plunger movable in accordance with the thrust of a solenoid so that the pressure for opening said disc valve is directly changed in accordance with movement of said plunger.