US 12,241,521 B2
Hydraulic shock absorber and method for manufacturing same
Shigeki Awasa, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
Filed on May 28, 2021, as Appl. No. 17/333,679.
Application 17/333,679 is a continuation of application No. PCT/JP2019/002859, filed on Jan. 29, 2019.
Prior Publication US 2021/0293298 A1, Sep. 23, 2021
Int. Cl. B62K 25/08 (2006.01); F16F 9/18 (2006.01); F16F 9/32 (2006.01)
CPC F16F 9/3221 (2013.01) [F16F 9/187 (2013.01); F16F 9/3257 (2013.01); B62K 25/08 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A front fork comprising:
a first tube body formed in a tubular shape and having an oil flowing therein;
a second tube body that is a tube body provided inside the first tube body, the second tube body having the oil flowing therein, and having the oil flowing in an oil passage formed between the first tube body and the second tube body;
a partition member provided in the second tube body and partitioning one end of an oil chamber;
a rod extending along an axis of the second tube body through the partition member and being configured to move relative to the partition member, an outer periphery of the rod having a dimple portion recessed toward a center of the rod; and
a piston provided at a distal end of the rod and allowing the oil to pass, wherein
a boundary between an outer peripheral surface of the rod and the dimple portion is formed in cross section by a curved surface, and
the dimple portion is formed intermittently in an elongated shape along a circumferential direction of the rod.