Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2022/070954
Kind Code:
A1
Abstract:
Provided is a construction machine capable of improving measurement accuracy of a load weight without decreasing the operational efficiency of a work apparatus. In a wheel loader as a construction machine comprising a hydraulic drive–type work apparatus 2, controllers 5, 5A that control a lift arm directional control valve 43 and bucket electromagnetic proportional valves 46A, 46B, and a controller 5 that measures the weight of a load: a switch 121 as a switching device for switching whether measurement of the weight of the load is carried out is comprised; and if the attitude of the work apparatus 2 satisfies a specified load weight measurement condition, and the switch 121 is on and pistons 222, 242 are positioned in a first region provided at one terminal edge side or a second region provided at the other terminal edge side, the controllers 5, 5A limit the size of a command electric current that is output to a lift arm electromagnetic proportional valve 45 and the bucket electromagnetic proportional valves 46 to be made smaller as the pistons 222, 242 approach the terminal edge.
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Inventors:
ITO KAZUYUKI (JP)
Application Number:
PCT/JP2021/034126
Publication Date:
April 07, 2022
Filing Date:
September 16, 2021
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F9/20; E02F9/22; E02F9/26; G01G19/10
Domestic Patent References:
| WO2019039606A1 | 2019-02-28 |
Foreign References:
| JP2002206252A | 2002-07-26 | |||
| JPH08311918A | 1996-11-26 | |||
| JP2018048503A | 2018-03-29 | |||
| JPH049245B2 | 1992-02-19 |
Other References:
See also references of EP 4098806A4
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (JP)
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