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Patent Searching and Data


Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/171547
Kind Code:
A1
Abstract:
Provided is a work machine capable of regenerating power from return hydraulic oil from a hydraulic actuator, and capable of preventing an increase in drag loss in a hydraulic pump and a regenerative hydraulic motor, and a decrease in the regeneration efficiency of the regenerative hydraulic motor. A controller 100 calculates a required rotational speed of a regenerative hydraulic motor 13 from the volumetric capacity of the regenerative hydraulic motor and the regeneration flow rate of the regenerative hydraulic motor, and calculates a required rotational speed fora first hydraulic pump 15 from the volumetric capacity of the first hydraulic pump and a target assist flow rate for the first hydraulic pump. Said controller 100 sets the larger of the required rotational speed for the regenerative hydraulic motor and the required rotational speed for the first hydraulic pump as the target rotational speed of an electric motor 14.

Inventors:
HIJIKATA Seiji (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)
IMURA Shinya (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2018/009049
Publication Date:
September 12, 2019
Filing Date:
March 08, 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
Domestic Patent References:
WO2017056200A12017-04-06
WO2015173963A12015-11-19
Foreign References:
JP2014037861A2014-02-27
Attorney, Agent or Firm:
KAICHI IP (3-16, Nihonbashi-muromachi 4-chome Chuo-k, Tokyo 22, 〒1030022, JP)
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