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Patent Searching and Data


Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/008190
Kind Code:
A1
Abstract:
A work machine is provided which, by suppressing speed variation of a hydraulic actuator accompanying hydraulic oil regeneration during implementation of machine control, can improve work efficiency while maintaining control accuracy of the machine control. A control device 100 is provided with: a region restricting control unit 110 which corrects the pilot pressures of pilot lines 41-43; a regeneration control unit 120 which adjusts, in the interval from zero to a prescribed upper restriction value, the flow rate of hydraulic oil merging from a tank-side oil passage 28a of an arm cylinder 12 into a pump-side flow path 28b; and a regeneration control switching unit 130 which instructs the regeneration control unit 122 to set the aforementioned prescribed upper restriction value to a first set value F1 if the function of the region restricting control unit is disabled, and instructs the regeneration control unit 120 to set the aforementioned prescribed upper restriction value to a second set value F2 smaller than the first set value if the function of the region restricting control unit is enabled.

Inventors:
IZUMI SHIHO (JP)
NARIKAWA RYUU (JP)
MEGURIYA SHUUICHI (JP)
AKITA TAROU (JP)
ISHIKAWA KOUJI (JP)
Application Number:
PCT/JP2017/007996
Publication Date:
January 11, 2018
Filing Date:
February 28, 2017
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F3/43; F15B11/024; F15B11/05; F15B11/08
Domestic Patent References:
WO2015194601A12015-12-23
Foreign References:
JP3594680B22004-12-02
JP3056254B22000-06-26
JPH11101202A1999-04-13
JPH1121941A1999-01-26
JPH08128065A1996-05-21
JPH0681375A1994-03-22
Other References:
See also references of EP 3483346A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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