Title:
HYDRAULIC PUMP FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2012/091182
Kind Code:
A1
Abstract:
Disclosed is a hydraulic pump for construction machinery for controlling to inhibit one-way driving when compound-operating two-way driving and work devices, such as a boom, to enhance operation efficiency. The hydraulic system for the construction machinery of the present invention provides the hydraulic system comprising: an operation device for driving and an operation lever for the work devices; a left driving motor which connects to a first hydraulic pump; a first control valve which is installed on the discharge flow path of the first hydraulic pump; a right driving motor which is connected to a second hydraulic pump; a hydraulic actuator which is connected to the first hydraulic pump and the second hydraulic pump; a second control valve which is installed on the discharge flow path of the first hydraulic pump or the second hydraulic pump; a third control valve which is installed on a flow path that branches from the discharge flow path of the second flow path; a first bypass valve which is connected to the upstream portion of the discharge flow path of the first hydraulic pump; a second bypass valve which is connected to the upstream portion of the discharge flow path of the second hydraulic pump; a confluence valve which is installed on a flow path which connects in parallel the discharge paths of the first and second hydraulic pumps; and a controller for controlling the opening of the first and second bypass valves and the confluence valve according to an operation signal that is input from the operation device for driving and the operation lever for the work device.
Inventors:
BAE SANG-KI (KR)
LEE JAE-HOON (KR)
JO SUNG-YONG (KR)
LEE JAE-HOON (KR)
JO SUNG-YONG (KR)
Application Number:
PCT/KR2010/009352
Publication Date:
July 05, 2012
Filing Date:
December 27, 2010
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
BAE SANG-KI (KR)
LEE JAE-HOON (KR)
JO SUNG-YONG (KR)
BAE SANG-KI (KR)
LEE JAE-HOON (KR)
JO SUNG-YONG (KR)
International Classes:
F15B13/02; E02F9/22; F15B13/044
Foreign References:
| KR20010092781A | 2001-10-26 | |||
| JPH0965791A | 1997-03-11 | |||
| JP2001253789A | 2001-09-18 | |||
| JP2000227101A | 2000-08-15 | |||
| KR20030008069A | 2003-01-24 |
Other References:
See also references of EP 2660479A4
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
윤의섭 (KR)
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Claims: