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Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/059584
Kind Code:
A1
Abstract:
Provided is a work machine configured so as to enable the operation of a work device to be limited through machine control (MC), improve the responsiveness of a hydraulic actuator with respect to the operation of an operation device by an operator, ensure operability that is equivalent to that of a work machine that does not have an MC function, and allow the hydraulic actuator for which the operation device is not being operated to automatically operate in any operation direction of the hydraulic actuator. In order to achieve the foregoing, a driving system comprises: a switching valve 203a provided between a secondary port 134a of an operation device 45a and a flow rate control valve 15a, and between a proportional solenoid valve 54a and the flow rate control valve 15a; and a switching valve 203b provided between a secondary port 134b of the operation device 45a and the flow rate control valve 15a, and between a proportional solenoid valve 54b and the flow rate control valve 15a. A controller 40 switches the switching valves 203a, 203b to either a first position or a second position on the basis of: a signal from pressure sensors 70a, 70b and pressure sensors 200a, 200b; and a preset target operation of the switching valves 203a, 203b.

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Inventors:
ISHII HIROKI (JP)
YAMAMOTO SHINJIRO (JP)
ITOU MASAMICHI (JP)
TSURUGA YASUTAKA (JP)
IMURA SHINYA (JP)
Application Number:
PCT/JP2020/019987
Publication Date:
April 01, 2021
Filing Date:
May 20, 2020
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F3/43; E02F9/22; F15B11/028; F15B11/08
Domestic Patent References:
WO2014192190A12014-12-04
Foreign References:
JP2017008501A2017-01-12
JP2019056247A2019-04-11
JP2019052472A2019-04-04
JP2018080510A2018-05-24
JP3091667B22000-09-25
JP2018080762A2018-05-24
Other References:
See also references of EP 3919689A4
Attorney, Agent or Firm:
KAICHI IP (JP)
Download PDF:
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