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Patent Searching and Data


Title:
FLOW CONTROL VALVE FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2012/070703
Kind Code:
A1
Abstract:
Disclosed is a flow control valve for a construction machine, wherein a flow rate supplied to a hydraulic actuator is uniformly controlled by a flow rate control spool in a spool. According to the present invention, a flow control valve for a construction machine includes a valve body having a supply path communicating with a pump path and an actuator port connected to an actuator, and a spool incorporated in a valve body, wherein the flow control valve comprises: a flow control spool switched in the spool so as to variably control the sectional area of a path that is connected to the actuator port at one side when a flow rate introduced into the supply path is higher than a set flow rate; a first path formed in the spool so as to communicate with the supply path; a second path formed in the spool so as to communicate with the actuator port at one side and having a sectional area of the path according to the switch of the flow control spool; a third path communicating with first and second flow control paths, which are formed in the flow control spool, so as to respectively communicate with the first and second paths; a first signal pressure path formed in the flow control spool so as to communicate the first flow control path with a pressure chamber; and a second signal pressure path formed in the flow control spool for communicating the third path with a back pressure chamber.

Inventors:
KU BON-SEUK (KR)
JOUNG HEA-GYOON (KR)
JEON MAN-SEUK (KR)
Application Number:
PCT/KR2010/008395
Publication Date:
May 31, 2012
Filing Date:
November 25, 2010
Export Citation:
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Assignee:
VOLVO CONSTR EQUIP AB (SE)
KU BON-SEUK (KR)
JOUNG HEA-GYOON (KR)
JEON MAN-SEUK (KR)
International Classes:
F15B13/02; E02F9/22; F16K11/07
Foreign References:
JPH07229503A1995-08-29
JP2004353859A2004-12-16
JP2007032782A2007-02-08
KR20060108850A2006-10-18
KR947003973A
JPH11257303A1999-09-21
Other References:
See also references of EP 2644905A4
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
Download PDF:
Claims: