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. 28, 2022
Filed:
Sep. 04, 2019
Kawasaki Jukogyo Kabushiki Kaisha, Kobe, JP;
Akihiro Kondo, Kobe, JP;
Makoto Ito, Kobe, JP;
Seiji Aoki, Kobe, JP;
Moriyuki Sakamoto, Kobe, JP;
Yoji Yudate, Kobe, JP;
KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe, JP;
Abstract
A hydraulic excavator drive system includes: a first pump that supplies hydraulic oil to a boom cylinder via a boom control valve, and supplies the hydraulic oil to a bucket cylinder via a first bucket control valve; a second pump that supplies the hydraulic oil to an arm cylinder via an arm control valve; a third pump that supplies the hydraulic oil to a slewing motor via a slewing control valve, and supplies the hydraulic oil to the bucket cylinder via a second bucket control valve; and a controller that moves one of the first bucket control valve and the second bucket control valve when a bucket excavating operation or a bucket dumping operation is performed concurrently with another operation, and moves both the first bucket control valve and the second bucket control valve when a bucket excavating operation is performed alone.