Title:
CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2019/054234
Kind Code:
A1
Abstract:
Provided is construction machinery with which it is possible to suppress the unintended operation of a hydraulic actuator even when a double discharge pump breaks down in a hydraulic closed circuit system. A hydraulic closed circuit system (200) is provided with pressure sensors (62a, 62b) for detecting the drain pressure of working oil discharged from drain ports (60a, 60b) of a plurality of double discharge pumps (10a, 10b). When, among the plurality of double discharge pumps, there exists a double discharge pump the drain pressure of which that was detected by the pressure sensors exceeds a prescribed pressure, a controller (40) determines that the double discharge pump the drain pressure of which exceeds a prescribed pressure is a broken double discharge pump and closes all of the selector valves, among a plurality of selector valves (11a, 11b, 12a, 12b), that are connected to the broken double discharge pump.
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| JP6047672 | Vacuum processor |
| WO/2017/077786 | LIQUID LEAK DETECTION DEVICE |
Inventors:
KAI TAKAMASA (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
SAITOH TEPPEI (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
SAITOH TEPPEI (JP)
Application Number:
PCT/JP2018/032747
Publication Date:
March 21, 2019
Filing Date:
September 04, 2018
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B20/00; E02F9/22; E02F9/24; F15B11/02
Foreign References:
| JP2017115994A | 2017-06-29 | |||
| JP2008196403A | 2008-08-28 | |||
| JPS6317421U | 1988-02-05 |
Attorney, Agent or Firm:
KAICHI IP (JP)
Download PDF:
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