Title:
FLOW RATE CONTROL DEVICE FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2016/093378
Kind Code:
A1
Abstract:
Disclosed is a hydraulic power circuit for recycling a flow which is relieved to an operating oil tank when a pressure exceeding a preset pressure occurs at an operating apparatus operating by means of the hydraulic fluid of a hydraulic pump. A hydraulic power circuit for a construction machine according to the present invention comprises: first and second hydraulic pumps and a pilot pump; a first hydraulic actuator which is driven by the hydraulic fluid of the first hydraulic pump; a second hydraulic actuator which is driven by the hydraulic fluid of the second hydraulic pump; first and second operation levers; a first control valve for controlling hydraulic fluid which is supplied from the first hydraulic pump to the second hydraulic actuator at the time of switching; a second control valve for controlling hydraulic fluid which is supplied from the second hydraulic pump to the second hydraulic actuator at the time of switching; a main relief valve which is installed in the flow path of the first hydraulic pump and in a drain flow path which connects the flow path of the second hydraulic pump to the operating oil tank; and a flow sharing valve installed in the drain flow path between the main relief valve and the operating oil tank.
Inventors:
PARK HYUNG-SEOK (KR)
KIM NAM-GUN (KR)
KIM NAM-GUN (KR)
Application Number:
PCT/KR2014/011999
Publication Date:
June 16, 2016
Filing Date:
December 08, 2014
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
PARK HYUNG-SEOK (KR)
PARK HYUNG-SEOK (KR)
International Classes:
E02F9/20; E02F9/22
Foreign References:
| KR20100044585A | 2010-04-30 | |||
| KR20090028874A | 2009-03-20 | |||
| JP2014512497A | 2014-05-22 | |||
| JP2011043219A | 2011-03-03 | |||
| JPH07158607A | 1995-06-20 |
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
윤의섭 (KR)
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