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:
May. 04, 2021
Filed:
May. 18, 2018
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Seiji Hijikata, Tsukuba, JP;
Yasutaka Tsuruga, Ryugasaki, JP;
Kouji Ishikawa, Kasumigaura, JP;
Kiwamu Takahashi, Moriyama, JP;
Masatoshi Hoshino, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A hydraulic circuit () of a hydraulic excavator () is provided with a main hydraulic circuit (A) including a boom cylinder (D), a pilot hydraulic circuit (B) for operating the boom cylinder (D) and a recovery hydraulic circuit (C) including an accumulator (). In this case, the recovery hydraulic circuit (C) is provided with a recovery control valve () that recovers pressurized oil discharged from the boom cylinder (D) to the accumulator (), a main supply control valve () for supplying pressurized oil accumulated in the accumulator () to the main hydraulic circuit (A) and a pilot supply control valve () for supplying pressurized oil accumulated in the accumulator () to the pilot hydraulic circuit (B).