Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/179863
Kind Code:
A1
Abstract:
[Problem] To provide a construction machine equipped with a hydraulic closed circuit system which can inhibit unintended operation of a hydraulic actuator and continue the operation of a machine body even when a switching valve is stuck open due to a failure in the switching valve or the control system thereof. [Solution] The present invention is provided with: first detection devices (37d-40d) which respectively detect the open/closed states of a plurality of switching valves (37-40); first forcibly-closing valve devices (50, 51) which switch the plurality of switching valves to a closed position regardless of an opening/closing control of a vehicle controller (11); and a valve device controller (33) which controls the first forcibly-closing valve device such that when one of the plurality of switching valves is detected to be stuck open on the basis of the open/closed states of the plurality of switching valves detected by the first detection device, another switching valve is closed which is connected to one closed-circuit pump among the plurality of closed-circuit pumps (35, 36) connected to the one switching valve.

Inventors:
SAITOH Teppei (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
KAI Takamasa (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)
TAKAHASHI Hiromasa (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)
Application Number:
JP2018/004049
Publication Date:
October 04, 2018
Filing Date:
February 06, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
F15B20/00; E02F9/20; E02F9/22; F15B11/02; F15B11/028; F15B11/08; F15B11/17
Foreign References:
JP2017053386A2017-03-16
JP2016142285A2016-08-08
JP2015048899A2015-03-16
JP2016114129A2016-06-23
Attorney, Agent or Firm:
KAICHI IP (3-16, Nihonbashi-muromachi 4-chome Chuo-k, Tokyo 22, 〒1030022, JP)
Download PDF: