Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
HYDRAULIC PUMP CONTROLLER FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO2010074507
Kind Code:
A3
Abstract:
The hydraulic pump controller for a construction machine according to the present invention comprises a hydraulic pump (10) wherein discharge flow is controlled by adjusting the swash plate angle, an auxiliary pump (14), a control valve (11) that controls the flow direction of fluid discharged from the hydraulic pump (10) and selectively supplies this to an actuator (13), an orifice (15) and a relief valve (16) that are mutually connected in parallel between a center bypass line (17) of the control valve (11) and a tank (T), signal pressure selection units (20, 120, 220) that receive the fluid that has passed the center bypass line (17) of the control valve (11) and the fluid discharged from the auxiliary pump (14) and selects the pressure of one of them as its signal pressure, and a regulator (30) that receives the signal pressure selected from the signal pressure selection units (20, 120, 220) to adjust a swash plate angle of the hydraulic pump (10); the signal pressure selection unit (20) selects the pressure of the fluid discharged from the auxiliary pump (14) when the construction machine is in an idle state to deliver this to the regulator (30).

Inventors:
CHO YOUNG SIK (KR)
JANG DAL SIK (KR)
Application Number:
PCT/KR2009/007721
Publication Date:
September 30, 2010
Filing Date:
December 23, 2009
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DOOSAN INFRACORE CO LTD (KR)
CHO YOUNG SIK (KR)
JANG DAL SIK (KR)
International Classes:
F15B11/02; E02F9/20; F15B13/02; F15B13/043
Foreign References:
KR100281008B12001-02-01
JPH02291436A1990-12-03
JPH08200307A1996-08-06
JP2008039063A2008-02-21
KR0152300B11998-10-15
Other References:
See also references of EP 2381115A4
Download PDF: