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:
Jul. 30, 2019
Filed:
Jan. 19, 2016
Hitachi Construction Machinery Co., Ltd., Taito-ku, Tokyo, JP;
Masafumi Hita, Tsuchiura, JP;
Shinya Imura, Toride, JP;
Shiho Izumi, Hitachinaka, JP;
Hidekazu Moriki, Mito, JP;
Hiroaki Amano, Tsukuba, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A motor-generator () is connected mechanically to an engine () and a hydraulic pump (). The hydraulic pump () delivers pressurized oil to cylinders (D) to (F) in a working mechanism (), a traveling hydraulic motor () and a revolving hydraulic motor (). The revolving hydraulic motor () drives a revolving device () in cooperation with a revolving electric motor (). An HCU () reduces outputs of the revolving electric motor (), the revolving hydraulic motor (), the boom cylinder (D) and the like such that a ratio of a revolving speed of an upper revolving structure () and a movement speed of raising a boom (A) is held to a ratio in a normal mode (NMODE) at the time of performing a compound movement of a revolving movement and a boom-raising movement in a low speed mode (LSMODE).