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Patent Searching and Data


Title:
CONTROL SYSTEM FOR OPERATING WORK DEVICE FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2013/051740
Kind Code:
A1
Abstract:
Disclosed is a control system for controlling flow so as to allow simultaneous usage of a parallel flow path and a tandem flow path thereby reducing loss of pressure inside a control valve, when simultaneously operating work devices having different operating pressures. A control system for operating the work device, according to the present invention, provides the control system for operating the work device for a construction machine, comprising: first and second hydraulic pumps that are connected to an engine; a revolution control valve, an arm control valve, and a left driving control valve, which are installed on a first center bypass path of the first hydraulic pump, and each of which is connected via the parallel flow path; a boom control valve, a bucket control valve, and a right driving valve, which are installed on a second center bypass path of the second hydraulic pump, and each of which is connected via the parallel flow path; a pressure generation device; a bleed flow path, which is formed on a control spool at a lower side of a boom of the boom control valve, for maintaining an open state of the second center bypass path without closing same, when the boom control valve is switched so as to lower the boom; and a center bypass switch valve, which is installed on the lowermost side of the second center bypass path and is switched by means of a control signal for switching the boom control valve.

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Inventors:
JOUNG HEA-GYOON (KR)
SONG YOUNG-BOG (KR)
Application Number:
KR2011/007439
Publication Date:
April 11, 2013
Filing Date:
October 07, 2011
Export Citation:
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Assignee:
VOLVO CONSTR EQUIP AB (S-631 85, SE)
JOUNG HEA-GYOON (KR)
SONG YOUNG-BOG (KR)
International Classes:
F15B13/043; E02F9/22; F15B13/02
Foreign References:
JPS57184136A1982-11-12
JPH08239865A1996-09-17
JPH1182413A1999-03-26
JP2004324208A2004-11-18
Other References:
See also references of EP 2772653A4
None
Attorney, Agent or Firm:
YOON, Eui-Seoup (135-080, KR)
윤의섭 (135-080, KR)
Download PDF:
Claims: