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Patent Searching and Data


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 (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
TSURUGA Yasutaka (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
ISHIKAWA Kouji (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
TAKAHASHI Kiwamu (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
HOSHINO Masatoshi (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2018/019334
Publication Date:
March 14, 2019
Filing Date:
May 18, 2018
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
F15B21/14; E02F9/22; F15B11/08
Domestic Patent References:
WO2016147283A12016-09-22
Foreign References:
JP2009250361A2009-10-29
JP2014206253A2014-10-30
JP2012013156A2012-01-19
JP2009250361A2009-10-29
Attorney, Agent or Firm:
HIROWA PATENT FIRM (4F. Nishishinjuku Koide Bldg, 1-3 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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