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. 18, 2024
Filed:
Dec. 27, 2021
Kawasaki Jukogyo Kabushiki Kaisha, Kobe, JP;
KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe, JP;
Abstract
A hydraulic excavator drive system () includes an arm control valve () and an arm switching valve (). The arm switching valve () is connected to an arm pushing supply line () by a rod-side line () and to an arm crowding supply line () by a head-side line (). The arm switching valve () is switched between a neutral position, a recycling position in which the arm switching valve () allows the rod-side line () to communicate with the head-side line () and a second tank line (), and a meter-out control position in which the arm switching valve () allows the head-side line () to communicate with the tank line (). The arm switching valve () incorporates therein a check valve () that allows a flow from the rod-side line () toward the head-side line () when the arm switching valve () is in the recycling position.