| 摘要 |
<p>Disclosed herein is a hydraulic shock absorber exhibiting a constant vibration damping force. The shock absorber is provided with a deep groove (14) formed on an upper surface (5a) of a piston (5) in a circle where piston ports formed through the piston lie and communicated with the piston ports (12). The groove has an outer peripheral wall (15) in such a manner that an upper opening is upwardly enlarged.</p> |
