Patent ID: 9707820
Date: 2017-07-18
CPC Classifications: B21D,B21H,B60G,F16F,F16J

Claim:
1. A shock absorber to be mounted between two members movable relative to each other, the shock absorber comprising: a cylinder having a working fluid sealed therein; a piston inserted into the cylinder; a piston rod coupled to the piston so as to extend to an outside of the cylinder; an outer tube arranged at an outer periphery of the cylinder; a separator tube provided to surround the outer periphery of the cylinder, the separator tube having a cylindrical side wall forming an annular passage communicating to an inside of the cylinder; a reservoir formed on an outside of the separator tube between the cylinder and the outer tube, the reservoir having the working fluid and a gas sealed therein; and a damping force generating mechanism arranged on an outside of the outer tube, wherein the separator tube has a sealing ring groove formed so as to extend in a circumferential direction of the separator tube, so that an outer periphery of the end portion side of the separator tube is expanded circumferentially, and an inner periphery of an end portion side of the separator tube is concave, and wherein the seal ring groove has a pair of side surfaces facing each other across a sealing ring so that a distance between the pair of the side surfaces is not narrowed but is widened from a bottom of the sealing ring groove toward an opening of the sealing ring groove, an inclination angle formed in a direction in which the distance between the side surfaces is widened with respect to a plane perpendicular to an axis of the separator tube by one of the pair of side surfaces of the sealing ring groove facing each other across the sealing ring, which is located on an opening end side of the separator tube, is larger than an inclination angle formed by the other one of the pair of side surfaces, which is located on an opposite side to the opening end side of the separator tube.