Patent ID: 9664247
Date: 2017-05-30
CPC Classifications: F16F

Claim:
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 bottomed cylindrical pilot body, the annular 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 annular elastic seal member is in abutment with a bottom portion of the bottomed cylindrical pilot body, and urges the disk valve toward the valve seat by elasticity of the annular elastic seal member, and wherein the shock absorber further comprises a communication passage establishing communication between chambers defined in the pilot chamber by the annular elastic seal member in abutment with the bottom portion of the bottomed cylindrical pilot body, wherein the annular elastic seal member is kept in abutment with the bottom portion of the bottomed cylindrical pilot body when the disk valve is opened, when the disk valve is closed, and while the disk valve is being opened or closed.