Hydraulic shock absorber

Abstract

A hydraulic shock absorber comprising a cylinder, a partition member for partitioning the interior of the cylinder into two chambers and a damping force generating mechanism for regulating the oil flow through a communication passageway formed through the partition member and connecting the two chambers with each other. The damping force generating mechanism comprises a disk valve seated on a seat formed on the partition member and adapted to open in response to the oil pressure in the communication passageway; a damping force regulating chamber arranged on the side of the disk valve remote from the partition member; an oil passageway for connecting the damping force regulating chamber to the communication passageway; an orifice disposed in the oil passageway to restrict the area of the oil passageway for oil flow therethrough; and fulcrum member arranged in the damping force regulating chamber and in contact with the disk valve for providing a fulcrum for the disk valve to deflect. The fulcrum member is designed such that the contact position in which the fulcrum member contacts with the disk valve is shifted in the radially outward direction of the disk valve in response to increase in the pressure of oil which flows into the damping force regulating chamber through the orifice.