Title:
HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE, AND CONTROL DEVICE FOR SAME
Document Type and Number:
WIPO Patent Application WO/2014/006950
Kind Code:
A1
Abstract:
A hydraulic circuit for a construction machine is provided with center bypass passages, to which pressurized oil discharged from hydraulic pumps is individually supplied. The hydraulic circuit for a construction machine is provided with: groups of directional control valves arranged in tandem in the center bypass passages; bleed-off valves arranged in portions of the center bypass passages, the portions being located downstream of the directional control valve groups; and a merging circuit for causing pressurized oil, which is supplied to one center bypass passage of the center bypass passages, to flow into the other center bypass passage. Each of the directional control valves is provided with: a first internal passage for causing supplied pressurized oil to flow to the center bypass passage; and a second internal passage for supplying pressurized oil, which has been supplied to the directional control valve, to a hydraulic actuator. The merging circuit is provided with a merging direction control valve for controlling the inflow direction of pressurized oil to be merged.
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| JP5292200 | Hydraulic pump device |
Inventors:
HASHIMOTO HIROFUMI (JP)
Application Number:
PCT/JP2013/060959
Publication Date:
January 09, 2014
Filing Date:
April 11, 2013
Export Citation:
Assignee:
SUMITOMO SHI CONSTR MACH CO (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/17
Foreign References:
| JPH1018359A | 1998-01-20 | |||
| JPH02248706A | 1990-10-04 | |||
| JPH10147959A | 1998-06-02 | |||
| JP2000009102A | 2000-01-11 | |||
| JPH11107328A | 1999-04-20 | |||
| JP2007120004A | 2007-05-17 | |||
| JP2007285520A | 2007-11-01 | |||
| JPH11257302A | 1999-09-21 |
Other References:
See also references of EP 2868930A4
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
Tadashige Ito (JP)
Tadashige Ito (JP)
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