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Patent Searching and Data


Title:
CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2018/097029
Kind Code:
A1
Abstract:
To ensure minimal hydraulic actuator operation even when one motor is inoperable while being able to conserve energy and reduce the size of a hydraulic system, this construction machinery comprises a first hydraulic drive device that is driven by a first motor, and a second hydraulic drive device that is driven by a second motor. The first hydraulic drive device has a first closed circuit to which a first hydraulic actuator and a first closed circuit pump are connected, and a first assist channel that connects the first closed circuit and a first open circuit pump and that supplies pressurized oil from the first open circuit pump to the first closed circuit. The second hydraulic drive device has a second closed circuit to which a second hydraulic actuator and a second closed circuit pump are connected. The present invention further comprises a first emergency channel that branches from the first assist channel and connects to the second closed circuit and that supplies pressurized oil from the first open circuit pump to the second closed circuit.

Inventors:
SAITOH Teppei (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
HIRAKU Kenji (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
SHIMIZU Juri (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
TAKAHASHI Hiromasa (HITACHI CONSTRUCTION MACHINERY CO. LTD., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2017/041304
Publication Date:
May 31, 2018
Filing Date:
November 16, 2017
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:
E02F9/22; F15B20/00
Foreign References:
JPS49109778A1974-10-18
JPS55153277U1980-11-05
JPS61204427A1986-09-10
JP2014045665A2014-03-17
US5176504A1993-01-05
JPS57123332A1982-07-31
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (UNIZO Nishishimbashi 3-chome Bldg, 13-3 Nishishimbashi 3-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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