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:
Jan. 05, 2021
Filed:
Jun. 20, 2019
Kobelco Construction Machinery Co., Ltd., Hiroshima, JP;
Natsuki Yumoto, Hiroshima, JP;
Koji Ueda, Hiroshima, JP;
KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima, JP;
Abstract
Provided is a hydraulic driving apparatus capable of operating hydraulic actuators that actuate a boom, an arm, and a tip attachment at respective suitable speeds. The hydraulic driving apparatus includes a first hydraulic pump connected to a first main actuator, a second hydraulic pump connected to a second main actuator and an attachment actuator, a first merging selector valve that allows hydraulic fluid to be supplied from the first hydraulic pump to the second main actuator, and a power distribution control device that operates displacement of the first and second hydraulic pumps so as to decrease power distribution from a pump drive source to the second hydraulic pump and increase power distribution from the pump drive source to the first hydraulic pump when a specified combined operational action is performed on the second main actuator and the attachment actuator.