Patent ID: 7065852

Claim:
A method of manufacturing a hydraulic shock absorber, the hydraulic shock absorber provided with a piston assembly comprising a metallic piston main body having a rod through hole and formed by sintering; a throttle oil passage formed by stamping the piston main body, a resinous molded sealing formed on the outer periphery of the piston main body; and a valve mounted on the piston main body; the manufacturing method comprising: a piston main body manufacturing step in which the process of sintering of the piston main body and the process of forming of the molded sealing on the piston main body are performed in sequence; a piston assembly manufacturing step in which the process of forming of the throttle oil passage on the piston main body and the process of assembling of valves onto the piston main body are performed in sequence; and a hydraulic shock absorber manufacturing step for manufacturing a hydraulic shock absorber using the piston assembly manufactured in the piston assembly manufacturing step.