Title:
Hydraulic driving device
Document Type and Number:
Japanese Patent JP6228430
Kind Code:
B2
Abstract:
This hydraulic drive unit (1) drives actuators (7, 9, 10) by supplying said actuators (7, 9, 10) with a hydraulic oil discharged from a hydraulic pump (11). The hydraulic drive device (1) is provided with operation valves (13, 14), a flow rate control mechanism (12), an electromagnetic proportional control valve (27), a failsafe mechanism (25), and a bleed-off valve (15). If the pressure difference between an output pressure (Prcv) and a control pressure (Psol) is within a configured control range (52) set in advance, the failsafe mechanism (25) outputs the control pressure (Psol) as a pilot pressure (Ppil), and, if said pressure difference is not within the configured control range (52), outputs the output pressure (Prcv) as the pilot pressure. The bleed-off valve (15) adjusts the opening area depending on the pilot pressure (Ppil), and discharges the hydraulic oil from the hydraulic pump (11) into a tank at a flow rate depending on the opening area.
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Inventors:
Tetsuhiro Kondo
Naoki Hata
Kazuto Fujiyama
Naoki Hata
Kazuto Fujiyama
Application Number:
JP2013226720A
Publication Date:
November 08, 2017
Filing Date:
October 31, 2013
Export Citation:
Assignee:
Kawasaki Heavy Industries, Ltd.
International Classes:
F15B20/00; E02F9/22
Domestic Patent References:
| JP11303809A | ||||
| JP2004360898A |
Attorney, Agent or Firm:
Patent business corporation Yuko patent office
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