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Patent Searching and Data


Title:
HYDRAULIC DRIVE DEVICE AND HYDRAULIC DRIVE SYSTEM PROVIDED THEREWITH
Document Type and Number:
WIPO Patent Application WO/2019/017318
Kind Code:
A1
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:
KONDO, Akihiro
NOSE, Tomomichi
HATA, Naoki
Application Number:
JP2018/026663
Publication Date:
January 24, 2019
Filing Date:
July 17, 2018
Export Citation:
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Assignee:
KAWASAKI JUKOGYO KABUSHIKI KAISHA (1-1 Higashikawasaki-cho 3-chome, Chuo-ku Kobe-sh, Hyogo 70, 〒6508670, JP)
International Classes:
F15B20/00; F15B11/08
Foreign References:
JPH0719207A1995-01-20
JP2017110672A2017-06-22
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (3rd Fl, Bo-eki Bldg. 123-1, Higashimachi, Chuo-ku, Kobe-sh, Hyogo 31, 〒6500031, JP)
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