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:
Sep. 07, 2010
Filed:
Aug. 29, 2005
Shuuji Shiozaki, Osaka, JP;
Hiroshi Matsuyama, Osaka, JP;
Shuuji Shiozaki, Osaka, JP;
Hiroshi Matsuyama, Osaka, JP;
Yanmar Co., Ltd., Osaka, JP;
Abstract
A hydraulic circuithaving a simple structure can recover energy of fluid. Hydraulic circuitcomprises a boom cylindera hydraulic pumpa motion switchover valvea hydraulic pressure regulation systemand a recovery pipeHydraulic pumpis driven by a drive sourceso as to deliver fluid to boom cylinderMotion switchover valveis disposed between boom cylinderand hydraulic pumpso as to switch a motion of boom cylinderHydraulic pressure regulation systemadjusts a differential pressure of motion switchover valvebetween a delivery portof hydraulic pumpand a suction port of boom cylinderto a predetermined value. Recovery pipesupplies hydraulic pumpwith fluid from motion switchover valveto which the fluid is drained from a drain port of boom cylinder