Title:
HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY AND CONTROL DEVICE FOR SAME
Document Type and Number:
WIPO Patent Application WO/2014/024521
Kind Code:
A1
Abstract:
The circuit has: a directional control valve group including a plurality of directional control valves arranged in tandem on a center bypass passage; and a bleed-off valve arranged on the center bypass passage downstream from the directional control valve group. The directional control valves are provided with a first inner passage for outflow of hydraulic fluid to the center bypass passage, and a second inner passage for supplying hydraulic fluid to a hydraulic actuator. Hydraulic fluid discharged from a pump outflows through the first inner passage to the center bypass passage at a point downstream with respect to the directional control valve, whereby the center bypass and the first inner passage form a parallel passage. The second inner passage supplies hydraulic fluid from the center bypass passage to a cylinder port through a bypass passage and/or opening in a spool.
Inventors:
HASHIMOTO HIROFUMI (JP)
Application Number:
PCT/JP2013/060962
Publication Date:
February 13, 2014
Filing Date:
April 11, 2013
Export Citation:
Assignee:
SUMITOMO SHI CONSTR MACH CO (JP)
International Classes:
F15B11/00; E02F9/22
Foreign References:
JPH1018359A | 1998-01-20 | |||
JPH11230375A | 1999-08-27 | |||
JPH10147959A | 1998-06-02 | |||
JP2000009102A | 2000-01-11 | |||
JPH11107328A | 1999-04-20 | |||
JPH03219102A | 1991-09-26 | |||
JP2009228872A | 2009-10-08 | |||
JPH11257302A | 1999-09-21 |
Other References:
See also references of EP 2884117A4
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
Tadashige Ito (JP)
Tadashige Ito (JP)
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