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Title:
HYDRAULIC SYSTEM FOR HYDRAULIC EXCAVATOR, HYDRAULIC EXCAVATOR, AND CONTROL METHOD FOR HYDRAULIC EXCAVATOR
Document Type and Number:
WIPO Patent Application WO/2022/209510
Kind Code:
A1
Abstract:
A hydraulic system for hydraulic excavators comprises a work state determination unit and a valve control unit. If a determination is made that a work machine is in a heavy-excavation state, the valve control unit controls a first boom operation valve, a first arm operation valve, a first packet operation valve, a second boom operation valve, a second arm operation valve, and a second packet operation valve such that: the passage of hydraulic fluid from a first hydraulic pump to a boom cylinder is restricted; hydraulic fluid is supplied from a second hydraulic pump to the boom cylinder; hydraulic fluid is supplied from both the first hydraulic pump and the second hydraulic pump to an arm cylinder; and hydraulic fluid is supplied from either the first hydraulic pump or the second hydraulic pump, or both, to the packet cylinder.

Inventors:
SUMINO WATARU (JP)
NAGURA SHINOBU (JP)
HISHINUMA YUICHI (JP)
Application Number:
PCT/JP2022/008181
Publication Date:
October 06, 2022
Filing Date:
February 28, 2022
Export Citation:
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Assignee:
KOMATSU MFG CO LTD (JP)
International Classes:
E02F9/22; F15B11/02
Domestic Patent References:
WO2017168822A12017-10-05
WO2019131979A12019-07-04
Foreign References:
JP2001248186A2001-09-14
JP2015172400A2015-10-01
JP2019039208A2019-03-14
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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