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. 09, 2020
Filed:
Dec. 18, 2017
Kawasaki Jukogyo Kabushiki Kaisha, Kobe-shi, Hyogo, JP;
Akihiro Kondo, Kobe, JP;
Makoto Ito, Kobe, JP;
KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe, JP;
Abstract
A hydraulic excavator drive system includes: a boom cylinder; a boom first control valve connected to the boom cylinder by a boom raising supply line and a boom lowering supply line, and connected to a first pump by a first boom distribution line; a boom second control valve connected to the boom raising supply line by a boom replenishment line, and connected to a second pump by a second boom distribution line; an arm cylinder; an arm control valve connected to the arm cylinder by an arm crowding supply line and an arm pushing supply line, and connected to the second pump by an arm distribution line; a regenerative line connecting between the boom replenishment line and the arm distribution line; and an openable and closeable regenerative valve provided on the regenerative line.