Patent ID: 8973726
Filing Date: 2015-03-10
Classification: F16F

Abstract:
1. A hydraulic shock absorber comprising, inside a cylindrical damper case: a cylinder which demarcates a piston oil chamber and a rod oil chamber so as to sandwich a piston; an outer cylinder body which is arranged outside the cylinder, said outer cylinder body demarcating a reflux path between it and the cylinder and demarcating a reservoir chamber between it and the damper case; and a valve structure which is mounted to each open end of the cylinder and the outer cylinder body on the side of the piston oil chamber and which is provided with a valve for controlling a flow of oil between the piston oil chamber and the reflux path and between the piston oil chamber and the reservoir chamber, wherein the reflux path connects the piston oil chamber and the rod oil chamber with each other, the reservoir chamber compensates for oil corresponding to tension and compression of a piston rod, the valve structure is constituted by a first valve structure to be mounted to the open end of the cylinder and a second valve structure to be mounted to the open end of the outer cylinder body, the first valve structure includes a skirt portion that abuts the outer cylinder body and a base portion of the second valve structure, and a cylinder assembly constituted by the cylinder and the first valve structure and an outer cylinder assembly constituted by the outer cylinder body and the second valve structure are independent of each other.