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    • 1. 发明公开
    • 건설기계의 PCA 유압시스템
    • PCA建筑机械液压系统
    • KR1020140114491A
    • 2014-09-29
    • KR1020130027260
    • 2013-03-14
    • 두산인프라코어 주식회사
    • 조용락장달식정우용안민하서아름
    • F15B13/02E02F9/22F15B17/00
    • F15B13/0401B60Y2200/41F15B1/02F15B13/024F15B13/025F15B2211/205F15B2211/20515
    • The present invention relates to a PCA hydraulic system of construction machinery, including an actuator (70) formed with first and second ports (70a, 70b) at a head side of a cylinder (72) and a rod (74) side; an accumulator (80); a first hydraulic line (La) connected to a pump/motor (40) and the first port (70a), in which the first pressure (Pa) is formed; a second hydraulic line (Lb) connected to the pump/motor (40) and the second port (70b), in which the second pressure (Pb) is formed; first and second check valves (310, 320) for allowing working oil to flow toward the first and second hydraulic lines (La, Lb) only; a plurality of relief valve units (60) for maintaining the first and second pressure (Pa, Pb) in a value equal to or less than the set pressure; and a control valve unit (200), if the first and second pressure (Pa, Pb) is applied to both sides of a spool, and high pressure is formed at any one of the first and second pressure (Pa, Pb), for interrupting the high pressure from the accumulator (80), and connecting the low pressure with the accumulator (80).
    • 本发明涉及一种工程机械的PCA液压系统,包括在气缸(72)的头侧和杆(74)侧形成有第一和第二端口(70a,70b)的致动器(70) 蓄电池(80); 连接到泵/马达(40)的第一液压管线(La)和形成有第一压力(Pa)的第一端口(70a) 连接到泵/马达(40)的第二液压管路(Lb)和形成第二压力(Pb)的第二端口(70b); 第一和第二止回阀(310,320),用于仅允许工作油流向第一和第二液压管线(La,Lb); 多个安全阀单元(60),用于将第一和第二压力(Pa,Pb)保持在等于或小于设定压力的值; 以及控制阀单元(200),如果将第一和第二压力(Pa,Pb)施加到阀芯的两侧,并且在第一和第二压力(Pa,Pb)中的任何一个处形成高压, 中断来自蓄能器(80)的高压,以及将低压与蓄能器(80)连接。