Hydraulic shock absorber for e.g. motor vehicle suspensions with valve opening pressure of damper valve regulated directly by adjusting the opening pressure of the pressure regulating valve

摘要

The shock absorber has a hydraulic cylinder with piston, piston rod, and main and auxiliary fluid passages, connected to the cylinder, to permit hydraulic fluid flow dependent upon a movement of the piston. A damper valve is located in the main fluid passage. A pressure regulation valve in the auxiliary passage uses the hydraulic pressure between itself and a fixed opening, to apply it as a pilot pressure to the damper valve. The pressure regulation valve has a valve chamber between a cylindrical section and a slide block moving in the section. An axial thrust in the block is caused by a differential between surfaces in the valve chamber to accommodate a pressure, acting in direction of the block axis. A valve opening pressure is regulated corresponding to the balance between the thrust of the slide block and that of a magnet.