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:
Oct. 01, 2013
Filed:
Mar. 27, 2008
Hiroyuki Yamaguchi, Tokyo, JP;
Yohei Katayama, Kawasaki, JP;
Hiroyuki Hayama, Yokohama, JP;
Takashi Nezu, Yokohama, JP;
Hiroyuki Yamaguchi, Tokyo, JP;
Yohei Katayama, Kawasaki, JP;
Hiroyuki Hayama, Yokohama, JP;
Takashi Nezu, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A fluid pressure shock absorber in which valve opening of the main valve is controlled by an inner pressure of a backpressure chamber. A first piston () and a second piston () coupled to a piston rod () are fitted in a cylinder () such that a piston chamber (C) is defined between the first and second pistons. An extension-side main valve () and a compression-side main valve () are provided in the piston chamber (C). Valve opening of the main valves is controlled by an extension-side backpressure chamber () and a compression-side backpressure chamber (). A compression-side check valve () and an extension-side check valve () are provided at the first piston () and the second piston (). During an extension stroke of the piston rod (), the compression-side check valve () is closed, whereby action of a pressure of a cylinder upper chamber (A) on the compression-side main valve () is prevented. During a compression stroke of the piston rod (), the extension-side check valve () is closed, whereby action of a pressure of a cylinder lower chamber (B) on the extension-side main valve () is prevented. Accordingly, it is possible to generate a stable damping force, and enhance durability of the extension-side main valve () and the compression-side main valve ().