The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2023
Filed:
Oct. 22, 2020
Applicant:
Showa Corporation, Gyoda, JP;
Inventor:
Yosuke Murakami, Fukuroi, JP;
Assignee:
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16F 9/46 (2006.01); F16F 9/56 (2006.01); B60G 15/12 (2006.01); B60G 17/02 (2006.01); F16F 1/12 (2006.01); B60G 17/027 (2006.01); B60G 17/044 (2006.01); B60G 15/06 (2006.01);
U.S. Cl.
CPC ...
F16F 9/46 (2013.01); B60G 15/12 (2013.01); F16F 1/121 (2013.01); F16F 9/56 (2013.01); B60G 15/06 (2013.01); B60G 17/027 (2013.01); B60G 17/0272 (2013.01); B60G 17/044 (2013.01); B60G 2202/314 (2013.01); B60G 2202/413 (2013.01); B60G 2500/30 (2013.01);
Abstract
A hydraulic shock absorber includes a piston, a damper tube, a suspension spring, a plunger, a jack chamber, a pump case, a pump piston, a screw shaft, and a drive unit. Both end surfaces of the pump piston in a reciprocating direction are a first end surface demarcating the pump chamber, and a second end surface demarcating the gas chamber, the second end surface having a screw hole into which the screw shaft is screwed. The pump piston includes a space portion between a bottom plate defining the first end surface and the screw hole. The screw shaft has a through-hole connecting the gas chamber with the space portion.