Patent ID: 7458448

Claim:
A 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 main valve that generates damping force by controlling flow of hydraulic fluid induced by sliding movement of said piston; a back-pressure chamber that allows its internal pressure to act on said main valve in a direction for closing said main valve; and a back-pressure chamber inlet passage through which a part of the hydraulic fluid of said flow of hydraulic fluid is introduced into said back-pressure chamber to control opening of said main valve, wherein a valve mechanism is provided that increases a flow path area of said back-pressure chamber inlet passage when said main valve opens so that the damping force is not adjusted from outside of the hydraulic shock absorber.