Title:
油圧駆動装置、及びそれを備える油圧駆動システム。
Document Type and Number:
Japanese Patent JP6940992
Kind Code:
B2
Abstract:
Provided is a hydraulic drive device that makes it possible to operate a hydraulic actuator in accordance with operation of an operation device, even when there has been a failure in an electromagnetic proportional control valve or a wiring pathway thereof. A hydraulic drive system, wherein: a first pilot pressure and a second output pressure are inputted to a switch valve so as to resist one another; the switch valve outputs a set pressure to a flow rate control valve as a second pilot pressure if the difference obtained by subtracting the second output pressure from the first pilot pressure is a predetermined pressure or greater; the switch valve outputs the second output pressure as the second pilot pressure if the difference is less than the predetermined pressure; and if such a determination is made that a second electromagnetic proportional control valve or a wiring pathway thereof is experiencing a failure that causes the second output pressure to be zero even if the operation device is operated in a second direction, then a control unit powers a first electromagnetic proportional control valve and causes the same to output a first output pressure, which is at least the predetermined pressure and corresponds to a second direction operation amount of the operation device, as the first pilot pressure to the flow rate control valve and the switch valve.
Inventors:
Tetsuhiro Kondo
Nose Chido
Naoki Hata
Nose Chido
Naoki Hata
Application Number:
JP2017142100A
Publication Date:
September 29, 2021
Filing Date:
July 21, 2017
Export Citation:
Assignee:
Kawasaki Heavy Industries, Ltd.
International Classes:
F15B20/00
Domestic Patent References:
| JP7019207A | ||||
| JP2017110672A |
Attorney, Agent or Firm:
Patent business corporation Yuko patent office