SHOCK ABSORBER

摘要

A damping force is generated by controlling a flow of oil caused by a sliding displacement of a piston in a cylinder with the aid of a disk valve, against extension and compression of a piston rod. An elastic seal member, fixedly attached to a back surface side of the disk valve, is fitted in a recessed portion of a pilot body, by which a pilot chamber is formed and valve opening of the disk valve is controlled by inner pressure in the pilot chamber. The elastic seal member is in abutment with a bottom portion of the recessed portion, and the disk valve is urged toward inner and other seat portions by elasticity of the elastic seal member. This configuration ensures that the disk valve can be closed without a set load provided from deflection of the disk valve, thereby generating a stable low damping force.

主权项

1. A shock absorber comprising:
a cylinder sealingly containing hydraulic fluid; a piston slidably disposed in the cylinder; a piston rod coupled with the piston and extending out of the cylinder; a disk valve configured to, with respect to a flow of the hydraulic fluid that is caused by a sliding displacement of the piston, generate a damping force by being separated from or seated onto a valve seat to control the flow; a bottomed cylindrical pilot body opened toward the disk valve; and an annular elastic seal member fixedly attached to an outer circumferential portion of one end of the disk valve and slidably and liquid-tightly fitted to an inner circumferential portion of the pilot body, the elastic seal member forming a pilot chamber configured to apply an inner pressure therein to the disk valve in a valve-closing direction, wherein the elastic seal member is in abutment with a bottom portion of the pilot body, and urges the disk valve toward the valve seat by elasticity of the elastic seal member, and wherein the shock absorber further comprises a communication passage establishing communication between chambers defined in the pilot chamber by the elastic seal member in abutment with the bottom portion of the pilot body.