| 主权项 |
1. A hydraulic shock absorber, comprising:
a body-side tube; a wheel-side tube slidably engaged with said body-side tube; a damper cylinder axially extending in said body-side tube; a piston rod axially extending in said wheel-side tube and inserted in said damper cylinder; a piston, provided on said piston rod, configured to slide on the inner circumferential surface of said damper cylinder and to partition the inside space of said damper cylinder into a rod-side oil chamber and a piston-side oil chamber, said piston having a damping force generating device; a bypass passage formed in said piston configured to allow the communication of said piston-side oil chamber and said rod-side oil chamber, said bypass passage comprising a first hole communicating with said piston-side oil chamber and a second hole communicating with said first hole and said rod-side oil chamber; and a rebound spring supported at one end thereof by an end member mounted to a lower opening portion of said damper cylinder, the rebound spring configured to be compressively deformed in the case of maximum expansion of said piston rod; wherein said piston rod has an axial side surface formed with an opening of said second hole exposed to said rod-side oil chamber, and a block ring having a surface axially opposed to said opening of said second hole, wherein the entire block ring is provided around said piston rod at a position between said axial side surface of said piston rod and the other end of said rebound spring, wherein, when said hydraulic shock absorber is expanded, said surface of said block ring comes into abutment against said axial side surface to close said opening of said second hole, wherein an annular stopper member abutting against said block ring biased by said rebound spring is fixed to an inner circumferential surface of said damper cylinder at a position between said axial side surface and said end member, wherein said piston rod is formed with a flange portion having said axial side surface, wherein an outer diameter of said flange portion is smaller than an inner diameter of said stopper member, and wherein an outer diameter of said block ring is larger than the inner diameter of said stopper member. |
