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Title:
HYDRAULIC CONTROL DEVICE FOR CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2014009566
Kind Code:
A
Abstract:

To identify the cause of travel abnormality by utilizing an existing circuit structure as it is for inspection.

During ON-operation of an inspection switch 33, a flow path selector valve 27 selects a second position (b) in accordance with a signal from a controller 28 to establish a second circuit state where both travel motors 10, 11 are driven by a second pump 26. In this state, alternate travel idling of both travel motors 10, 11 are allowed. Cut valves 29, 30 in center bypass lines C1, C2 are closed depending on the driven travel motors and the discharge flow amount of the second pump 26 is controlled depending on a travelling operation amount. Thereby, the occurrence of abnormality in either both travel motors 10, 11 or both pumps 25, 26 is identified.


Inventors:
TAKESHITA TATSUYA
Application Number:
JP2012149046A
Publication Date:
January 20, 2014
Filing Date:
July 03, 2012
Export Citation:
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Assignee:
KOBELCO CONSTR MACHINERY LTD
International Classes:
E02F9/22; E02F9/26; F15B20/00
Domestic Patent References:
JP2005344818A2005-12-15
JP2007120004A2007-05-17
JP2003004005A2003-01-08
JP2005299376A2005-10-27
JP2006010014A2006-01-12
JP2005307792A2005-11-04
JPH11229442A1999-08-24
JPH11303148A1999-11-02
JP2004019807A2004-01-22
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Muramatsu Toshiro