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:
Dec. 07, 2021
Filed:
Sep. 03, 2019
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Hidekazu Moriki, Tokyo, JP;
Akira Kanazawa, Tokyo, JP;
Takaaki Chiba, Tokyo, JP;
Shinya Imura, Tsuchiura, JP;
Yasutaka Tsuruga, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
To provide a construction machine that can highly precisely control branch flows from a hydraulic pump to a plurality of hydraulic actuators without being affected by load conditions. A controller () has a meter-out valve control section () configured to calculate a target opening area of a second meter-out valve () () according to a pressure difference between a supply pressure and a second meter-in pressure, or calculate a target opening area of a first meter-out valve () () according to a pressure difference between the supply pressure and the first meter-in pressure.