Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2011/074781
Kind Code:
A2
Abstract:
A hydraulic system for construction machinery according to the present invention is applied to construction machinery having a steering unit (20) for controlling the steering of equipment, and a main control valve (30) for controlling the operation of working machinery, wherein the hydraulic system comprises: a main pump (10) for discharging working fluid to be supplied to the steering unit (20) and the main control valve (30); a load sensing pressure sensor (60) for sensing a load sensing pressure of the steering unit (20); a priority valve (22) installed on a supply line for working fluid discharged from the main pump to distribute and supply working fluid discharged from the main pump to the steering unit (20) and the main control valve (30) according to the load sensing pressure; an auxiliary pump (40) for supplementing the supply of working fluid distributed by the priority valve to the supply line supplying the steering unit (20); an electric motor (50) for driving the auxiliary pump (40); and a controller (80) for actuating the electric motor (50) to additionally supply the working fluid discharged from the auxiliary pump (40) to the steering unit (20) when the load sensing pressure is greater than a reference load sensing pressure.
Inventors:
KIM, Jeung Hwa (Mirinae Maeul Apt, Jung-dong Wonmi-guBucheon-si, Gyeonggi-do 420-020, 420-020, KR)
Application Number:
KR2010/007709
Publication Date:
June 23, 2011
Filing Date:
November 03, 2010
Export Citation:
Assignee:
DOOSAN INFRACORE CO., LTD. (7-11, Hwasu-dong Dong-gu, Incheon 401-020, 401-020, KR)
두산인프라코어 주식회사 (인천광역시 동구 화수동 7-11, 401-020 Incheon, 401-020, KR)
두산인프라코어 주식회사 (인천광역시 동구 화수동 7-11, 401-020 Incheon, 401-020, KR)
International Classes:
E02F9/22; E02F9/20; F15B1/027; G05D16/08
Attorney, Agent or Firm:
LEE, Byungchul (14F, Kukdong Building 60-1,Chungmuro3-ka, Chung-ku, Seoul 100-705, 100-705, KR)