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:
May. 24, 2011
Filed:
Apr. 26, 2005
Tatsuya Masamura, Tokyo, JP;
Tatsuya Masamura, Tokyo, JP;
Kayaba Industry Co., Ltd., Tokyo, JP;
Abstract
Provided is a hydraulic shock absorber enabling an increase in a variable range of both damping forces produced in an extension stroke and a compression stroke thereof. A cylinder () filled with hydraulic oil is divided into first and second oil chambers () and () by a piston (), and a main valve () is disposed in a main passage () of the piston (). An extension side pilot chamber () urging a spool () in a valve-closing direction at pilot pressure introduced thereinto through a first orifice () in the extension stroke and a compression-side pilot chamber () urging the spool () in the valve-closing direction at pilot pressure introduced thereinto through a second orifice () in the compression stroke are formed at a back face of the spool () of the main valve. Also, the shock absorber comprises a pressure-receiving portion for receiving high pressure in the extension stroke and urging the spool () in a valve-opening direction against the pilot pressure and a pressure-receiving portion for receiving high pressure in the compression stroke and urging the spool () in the valve-opening direction against the pilot pressure. In addition, the shock absorber comprises an extension-side poppet valve () for regulating the pilot pressure in the extension stroke, a compression-side poppet valve () for regulating the pilot pressure in the compression stroke, and a solenoid () for urging to reduce initial loads of springs () of the extension-side and compression-side poppet valves () and () by passing current therethrough.