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. 05, 2022
Filed:
Sep. 08, 2017
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Kiwamu Takahashi, Moriyama, JP;
Kouji Ishikawa, Kasumigaura, JP;
Yasutaka Tsuruga, Ryugasaki, JP;
Masatoshi Hoshino, Tsuchiura, JP;
Seiji Hijikata, Tsukuba, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A first torque control proportional electromagnetic valve () is connected through a first torque control line () to a third pressure receiving chamber (D) in a first torque control regulator (). A second torque control proportional electromagnetic valve () is connected through a second torque control line () to a third pressure receiving chamber (D) in a second torque control regulator (). The first and second torque control proportional electromagnetic valves () are controlled by a controller. A switching valve () is provided between the first torque control line () and the second torque control line (). The switching valve () supplies an output pressure of the first torque control proportional electromagnetic valve () to the third pressure receiving chamber (D) in the second torque control regulator () at the time of driving hydraulic motors (B,C) for left side and right side traveling.