Title:
CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2019049335
Kind Code:
A
Abstract:
To provide a construction machine capable of suppressing the unintended operation of a hydraulic actuator even when a double discharge type pump in a hydraulic closed circuit system is in trouble.SOLUTION: A hydraulic closed circuit system 200 includes pressure sensors 62a, 62b for detecting the drain pressure of operating oil to be discharged from drain ports 60a, 60b of a plurality of double discharge type pumps 10a, 10b. When there is the double discharge type pump where the drain pressure detected by the pressure sensors exceeds a predetermined pressure, out of the plurality of double discharge type pumps, a controller 40 determines that the double discharge type pump where the drain pressure exceeds the predetermined pressure is the one that is in trouble, so that some of a plurality of selector valves 11a, 11b, 12a, 12b, connected to the double discharge type pump in trouble, are all closed.SELECTED DRAWING: Figure 2
Inventors:
KAI TAKAMASA
HIRAKU KENJI
TAKAHASHI HIROMASA
SAITO TEPPEI
HIRAKU KENJI
TAKAHASHI HIROMASA
SAITO TEPPEI
Application Number:
JP2017174669A
Publication Date:
March 28, 2019
Filing Date:
September 12, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B20/00; E02F9/22; E02F9/24; F15B11/02
Attorney, Agent or Firm:
Kaichi International Patent Office