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:
Nov. 26, 2013
Filed:
Feb. 28, 2011
Atsushi Maeda, Fujisawa, JP;
Masaru Kouyama, Ayase, JP;
Mikio Yamashita, Yokohama, JP;
Fumiyuki Yamaoka, Sagamihara, JP;
Atsushi Maeda, Fujisawa, JP;
Masaru Kouyama, Ayase, JP;
Mikio Yamashita, Yokohama, JP;
Fumiyuki Yamaoka, Sagamihara, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-Shi, JP;
Abstract
A shock absorber includes a first passage and a second passage to which a working fluid flows out from one chamber in a cylinder by movement of a piston, a damping valve installed on the first passage and configured to regulate a flow of the working fluid caused by sliding of the piston to generate a damping force, a back pressure chamber applying an internal pressure to the damping valve in a closing direction of the damping valve, a back pressure chamber inflow oil passage introducing the working fluid from one chamber into the back pressure chamber, a pressure chamber provided in-between on the second passage, and a free piston installed in the pressure chamber so as to freely slide in the pressure chamber.