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. 19, 2022
Filed:
May. 20, 2020
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Hiroki Ishii, Tsuchiura, JP;
Shinjiro Yamamoto, Ami-machi, JP;
Masamichi Itou, Toride, JP;
Yasutaka Tsuruga, Ryuugasaki, JP;
Shinya Imura, Toride, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
There is provided a work machine that can limit operation of a work device by MC, and improves the responsiveness of a hydraulic actuator to operation of an operation device by an operator, and ensures operability equivalent to that of a work machine that does not have MC functions, and allows the hydraulic actuator for which the operation device is not being operated to automatically operate in either direction of the operation directions thereof. For this purpose, a drive system includes a selector valvedisposed between a secondary portof an operation deviceand a flow control valveand between a proportional solenoid valveand the flow control valveand a selector valvedisposed between a secondary portof the operation deviceand the flow control valveand between a proportional solenoid valveand the flow control valve. A controllerswitches the selector valvesandto either one of a first position and a second position on the basis of signals from pressure sensorsandand pressure sensorsandand target operation set in advance regarding the selector valvesand