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Title:
HYDRAULIC CONTROL DEVICE AND CONSTRUCTION MACHINE WITH SAME
Document Type and Number:
WIPO Patent Application WO/2013/105199
Kind Code:
A1
Abstract:
A hydraulic control device is configured so as to reduce the loss of power of a pump in combined boom lowering and arm pushing operation. During the single operation of boom lowering, a controller (30) performs single control for increasing the capacity of a first pump (14) in response to an increase in the amount of operation of a boom operation member (19). During a limitation control period in which combined boom lowering and arm pushing operation is detected and, at the same time, the amount of operation of the boom operation member (19) is more than a specified amount of operation, the controller (30) limits the capacity of the first pump (14) to a level less than the capacity thereof for the single control.

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WO/2011/078557ELECTRONIC HYDRAULIC CONTROL APPARATUS USING VARIABLE BEHAVIOR CHARACTERISTICS, AND METHOD FOR SAME
JP2560338[Name of invention] Two-stage relief valve circuit
Inventors:
TAJIMA KAZUHARU
UEDA KOJI
Application Number:
PCT/JP2012/008376
Publication Date:
July 18, 2013
Filing Date:
December 27, 2012
Export Citation:
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Assignee:
KOBELCO CONSTR MACH CO LTD (JP)
International Classes:
E02F9/22; F15B11/00
Foreign References:
JP2004346485A2004-12-09
JPH0634064U1994-05-06
JPH04194129A1992-07-14
JP2007023606A2007-02-01
JPH10102547A1998-04-21
JP2007023606A2007-02-01
Other References:
See also references of EP 2803770A4
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
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Claims:



 
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