Title:
建設機械
Document Type and Number:
Japanese Patent JP6731373
Kind Code:
B2
Abstract:
[Subject] To provide a construction machine that incorporates a hydraulic closed circuit system capable of suppressing, even where a selector valve is sticked in an open state by a failure of the selector valve or a control system therefor, unintended operation of a hydraulic actuator and continuing operation of a machine body.[Solving Means] The construction machine includes first sensors (37d to 40d) that detect open-closed states of a plurality of switching valves (37 to 40), first compulsory valve closing devices (50, 51) that change over the plurality of switching valves to a closed position irrespective of open-close control by a machine body controller (11), and a valve device controller (33) that controls, when it is detected based on the open-closed states of the plurality of selector values detected by the first sensors that one of the plurality of selector values is sticked in an open state, the first compulsory valve closing device such that other selector valve connected to one of the plurality of closed circuit pumps (35, 36) to which the one selector valve is connected is closed.
Inventors:
Teppei Saito
Takashi Kai
Kenji Hirai
Hiromasa Takahashi
Shimizu Freedom
Takashi Kai
Kenji Hirai
Hiromasa Takahashi
Shimizu Freedom
Application Number:
JP2017068540A
Publication Date:
July 29, 2020
Filing Date:
March 30, 2017
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
F15B20/00; E02F9/20; E02F9/22; F15B11/02; F15B11/028; F15B11/08; F15B11/17
Domestic Patent References:
| JP2017053386A | ||||
| JP2016142285A |
Attorney, Agent or Firm:
Kaichi International Patent Office