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Patent Searching and Data


Title:
HYDRAULIC DRIVE DEVICE OF WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/131674
Kind Code:
A1
Abstract:
This hydraulic drive device is provided with a third boom direction control valve 82 and a rotation direction control valve 81 connected to a third hydraulic pump 33. The hydraulic drive device is further provided with: a second backup direction control valve 84 which is connected to the third hydraulic pump 33 and to which a second special hydraulic actuator 64 for driving a special attachment can be connected; and a first switching valve 96 which is connected to the third hydraulic pump 33 on the upstream side of the second backup direction control valve 84 and to which an additional hydraulic pump 97 can be connected. The first switching valve 96 switches the hydraulic pressure source of the second special hydraulic actuator 64, which is connected to the second backup direction control valve 84, between at least the third hydraulic pump 33 and an additional hydraulic pump 97. This hydraulic drive device, which is equipped with the backup direction control valve to which an additional hydraulic actuator for driving the special attachment can be connected, can enhance complex operability of the special attachment.

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Inventors:
HAGIWARA Masayuki (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
KODAKA Katsuaki (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
KANEHAMA Mitsuhiko (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2018/047649
Publication Date:
July 04, 2019
Filing Date:
December 25, 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:
F15B11/00; E02F3/36; E02F9/22; F15B11/02
Foreign References:
US20140090369A12014-04-03
JP2017180562A2017-10-05
Attorney, Agent or Firm:
KAICHI IP (3-16, Nihonbashi-muromachi 4-chome Chuo-k, Tokyo 22, 〒1030022, JP)
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