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:
Jun. 09, 2015
Filed:
Oct. 14, 2010
Katsuaki Kodaka, Tsukuba, JP;
Yuta Nakamura, Tsuchiura, JP;
Hidetoshi Satake, Ishioka, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
A hydraulic system for a working machine is provided in which when heavy load fine speed operation work is performed using hydraulic cylinders as hydraulic actuators, and deterioration of fuel consumption can be prevented by reducing energy loss and improving fine speed operability. A center bypass cutoff valveis disposed downstream of a center bypass line, and pressure sensors, a controller, and a solenoid valveprovide control such that, when operating meanscorresponding to a boom cylinder(specific hydraulic actuator) among a plurality of operating means-is operated to supply a hydraulic fluid to a cylinder chamberof the boom cylinderin a load retaining side, the center bypass cutoff valveis actuated and a fluid delivery pressure of a first hydraulic pumpis increased to be higher than a load pressure of the boom cylinder
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile