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, 2021
Filed:
May. 20, 2019
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Juri Shimizu, Tokyo, JP;
Kenji Hiraku, Tsuchiura, JP;
Hiromasa Takahashi, Tsuchiura, JP;
Teppei Saitou, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide a construction machine that has a hydraulic closed-circuit system mounted therein and capable of selectively connecting some of a plurality of hydraulic pumps driven by two engines to any one of a plurality of hydraulic actuators and that can downsize the engines while maintaining high work efficiency. A controllerincludes an actuator/engine allocation computing section Fthat, at the time of connecting closed-circuit pumps that are not connected to any of the hydraulic actuators, andto any one of the hydraulic actuators, allocates closed-circuit pumps driven by a right engineto the one hydraulic actuator in a case in which an estimated maximum load on a left engineis heavier than an estimated maximum load on the right engine, and allocates closed-circuit pumps driven by the left engine to the one hydraulic actuator in a case in which the estimated maximum load on the right engine is heavier than the estimated maximum load on the left engine.