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:
Apr. 23, 2024
Filed:
Dec. 08, 2021
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Kento Kumagai, Ami-Machi, JP;
Shinya Imura, Toride, JP;
Yasutaka Tsuruga, Ryugasaki, JP;
Takaaki Chiba, Tsuchiura, JP;
Hiroaki Amano, Tsukuba, JP;
Shinji Nishikawa, Kasumigaura, JP;
Akihiro Narazaki, Tsukuba, JP;
Genroku Sugiyama, Ryugasaki, JP;
Shinjiro Yamamoto, Ami-Machi, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
The invention of the present application intends to provide a work machine that can ensure high operability by preventing abrupt actuation of an actuator and a shock to a machine body by use of a bleed-off function at the time of starting of the actuator and that can improve the energy-saving performance by reducing a bleed-off flow rate after the starting of the actuator. For this purpose, a controller opens a bleed-off valve at a timing at which an operation device is being operated and before a flow rate of a hydraulic pump starts increasing, and closes the bleed-off valve at a timing at which the operation device is being operated and after the flow rate of the hydraulic pump has started increasing.