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Patent Searching and Data


Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2013/089284
Kind Code:
A1
Abstract:
Disclosed is a hydraulic system for enhancing controllability during a combination operation, in which an actuator, such as a boom, and a swing motion can be controlled simultaneously. The hydraulic system according to the present invention comprises: an actuator joystick and a swing control device; a hydraulic pump; and a work actuator and a swing motor, each of which are connected to the hydraulic pump; a first control valve, which is installed on a discharge flow path between the hydraulic pump and the work actuator, for controlling the work actuator during switching; a second control valve, which is installed on a flow path between the hydraulic pump and the swing motor, for controlling the swing motor during switching; a first pressure compensation valve, which is installed at an upstream side of the discharge flow path of the first control valve, for controlling an opening by means of the difference between a maximum load sensing pressure and the pressure of the discharge flow path of the first control valve; a second pressure compensation valve, which is installed at an upstream side of the discharge flow path of the second control valve, for controlling an opening by means of the difference between the maximum load sensing pressure and the pressure of the discharge flow path of the second control valve, wherein the pressure of the discharge flow path of the first control valve is transferred through the flow path to a maximum load sensing pressure line, and the flow path for transferring the pressure of the discharge flow path of the second control valve to the maximum load sensing pressure line is blocked.

Inventors:
BAE SANG-KI (KR)
LEE JAE-HOON (KR)
Application Number:
KR2011/009525
Publication Date:
June 20, 2013
Filing Date:
December 12, 2011
Export Citation:
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Assignee:
VOLVO CONSTR EQUIP AB (S-631 85, SE)
BAE SANG-KI (KR)
LEE JAE-HOON (KR)
International Classes:
F15B13/02; E02F9/22; F16K31/04
Domestic Patent References:
WO2001055603A12001-08-02
Foreign References:
JPH0776862A1995-03-20
JPH0616703U1994-03-04
KR20110074388A2011-06-30
Attorney, Agent or Firm:
YOON, Eui-Seoup (135-080, KR)
윤의섭 (135-080, KR)
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Claims: