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Title:
HYDRAULIC PRESSURE-REGULATING VALVE FOR CONSTRUCTION EQUIPMENT
Document Type and Number:
WIPO Patent Application WO/2011/145754
Kind Code:
A1
Abstract:
Disclosed is a hydraulic pressure-regulating valve capable of increasing the driven speed of operating equipment such as a boom, arm, etc., by combining working fluid supplied to an actuator. A hydraulic pressure-regulating valve for construction equipment according to one embodiment of the present invention comprises: a boom spool slidably coupled in a valve block, regulating working fluid supplied to the actuator from a first hydraulic pump and a second hydraulic pump during switching, and defining a passage therein; a first hydraulic pump supply passage and a second hydraulic pump supply passage formed vertically symmetrical about the boom spool; a check valve resiliently supported so as to open and close the first hydraulic pump supply passage and the second hydraulic pump supply passage, respectively; a bridge passage formed laterally and vertically symmetrical with respect to a passage formed in the sliding surface of the valve block, to supply working fluid from the first hydraulic pump supply passage and the second hydraulic pump supply passage to the actuator; a cylinder passage for supplying working fluid from the first hydraulic pump to the actuator during the switching of the boom spool; and a connecting passage for supplying working fluid from the second hydraulic pump to the inner passage of the boom spool during the switching of the boom spool.

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JP3118787OIL-PRESSURE CIRCUIT OF CONSTRUCTION MACHINE
WO/1990/013713HYDRAULIC CIRCUIT APPARATUS OF HYDRAULIC EXCAVATOR
Inventors:
KIM JIN-WOOK (KR)
Application Number:
PCT/KR2010/003095
Publication Date:
November 24, 2011
Filing Date:
May 17, 2010
Export Citation:
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Assignee:
VOLVO CONSTR EQUIP AB (SE)
KIM JIN-WOOK (KR)
International Classes:
E02F9/22; E02F3/42; F15C3/00; F15C3/02
Foreign References:
KR100814499B12008-03-18
JP2009103304A2009-05-14
JPH06137304A1994-05-17
JPH07110007A1995-04-25
Other References:
See also references of EP 2573282A4
None
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
Download PDF:
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Claims:



 
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