Title:
作業機械の油圧駆動装置
Document Type and Number:
Japanese Patent JP7433100
Kind Code:
B2
Abstract:
To provide a hydraulic drive device of a work machine capable of correctly detecting a malfunction of a control valve.SOLUTION: A hydraulic drive device of a work machine includes a hydraulic actuator (1), a control valve (11) that has a pair of pilot ports (11a and 11b), and controls the operation of the hydraulic actuator by pilot pressure (Pa and Pb) output to one or the other of the pair of pilot ports, output destination detecting means (20) that detects an output destination of the pilot pressure, and determining means (20) that determines a malfunction of the control valve. The determining means determines the malfunction of the control valve on the basis of the pressure (Pb) acted on the other pilot port (11b) after a predetermined time (T) has passed since the output detecting means detects that the output destination of the pilot pressure is the one pilot port (11a).SELECTED DRAWING: Figure 3
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Inventors:
Reisuke Kamiya
Application Number:
JP2020051498A
Publication Date:
February 19, 2024
Filing Date:
March 23, 2020
Export Citation:
Assignee:
Sumitomo Heavy Industries Construction Crane Co., Ltd.
International Classes:
F15B20/00; F15B11/08
Domestic Patent References:
| JP2006308073A | ||||
| JP2018169015A | ||||
| JP2003322112A | ||||
| JP2020002625A | ||||
| JP7019207A | ||||
| JP2011190072A | ||||
| JP2012237423A |
Attorney, Agent or Firm:
Patent Attorney Corporation Takewa International Patent Office
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