Title:
HYDRAULIC SYSTEM OF CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2013/100511
Kind Code:
A1
Abstract:
The present invention relates to a hydraulic system of a construction machine. A hydraulic system of a construction machine according to the present invention includes: an EPPRV (60, Electronic Proportional Pressure Reducing Valve) for controlling a flow rate, to which maximum pressure is input as a control current value and which is set to a minimum flow rate; a gear pump (70) for providing pilot operation oil to the EPPRV (60); a shuttle valve (80) for comparing the pressure of first pilot operation oil which has passed through the EPPRV (60) and the pressure of a flow rate control signal and then outputting second pilot operation oil of greater pressure; a hydraulic pump (10) of which swash plate angle is controlled by the second pilot operation oil; and a pump control device (50) for controlling the pressure of the EPPRV (60) to be reduced from the maximum pressure according to a set inclination if the flow rate control signal is generated.
Inventors:
BANG JAISEOK (KR)
Application Number:
KR2012/011356
Publication Date:
July 04, 2013
Filing Date:
December 24, 2012
Export Citation:
Assignee:
DOOSAN INFRACORE CO LTD (KR)
International Classes:
F15B13/02; F15B13/043; F15B13/044; F15B21/08
Foreign References:
| JP2008196565A | 2008-08-28 | |||
| JP2005060970A | 2005-03-10 | |||
| JP2010230133A | 2010-10-14 | |||
| JP2010174980A | 2010-08-12 | |||
| JP2009249875A | 2009-10-29 |
Attorney, Agent or Firm:
HANBEOT PATENT LAW FIRM (KR)
특허법인 한벗 (KR)
특허법인 한벗 (KR)
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