Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/049435
Kind Code:
A1
Abstract:
In the present invention a hydraulic circuit (11) in a hydraulic shovel (1) comprises: a main hydraulic circuit (11A) that includes a boom cylinder (5D); a pilot hydraulic circuit (11B) for operating the boom cylinder (5D); and an oil recovery circuit (11A) that includes an accumulator (29). In this case, the oil recovery circuit (11C) comprises: a recovery control valve (31) for returning to the accumulator (29) pressurized oil discharged from the boom cylinder (5D); a main supply control valve (34) for supplying pressurized oil that has accumulated in the accumulator (29) to the main hydraulic circuit (11A); and a pilot supply control valve (37) for supplying pressurized oil that has accumulated in the accumulator (29) to the pilot hydraulic circuit (11B).
Inventors:
HIJIKATA SEIJI (JP)
TSURUGA YASUTAKA (JP)
ISHIKAWA KOUJI (JP)
TAKAHASHI KIWAMU (JP)
HOSHINO MASATOSHI (JP)
TSURUGA YASUTAKA (JP)
ISHIKAWA KOUJI (JP)
TAKAHASHI KIWAMU (JP)
HOSHINO MASATOSHI (JP)
Application Number:
PCT/JP2018/019334
Publication Date:
March 14, 2019
Filing Date:
May 18, 2018
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B21/14; E02F9/22; F15B11/08
Domestic Patent References:
WO2016147283A1 | 2016-09-22 |
Foreign References:
JP2009250361A | 2009-10-29 | |||
JP2014206253A | 2014-10-30 | |||
JP2012013156A | 2012-01-19 | |||
JP2009250361A | 2009-10-29 |
Other References:
See also references of EP 3578830A4
Attorney, Agent or Firm:
HIROWA PATENT FIRM (JP)
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