CONSTRUCTION MACHINE - HITACHI CONSTRUCTION MACH CO

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)

Application Number:

PCT/JP2018/019334

Publication Date:

March 14, 2019

Filing Date:

May 18, 2018

Export Citation:

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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: