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    • 10. 发明专利
    • Hydraulic closed circuit system
    • 液压闭合电路系统
    • JP2013160318A
    • 2013-08-19
    • JP2012023491
    • 2012-02-06
    • Sumitomo Heavy Ind Ltd住友重機械工業株式会社
    • TERADA SHINJI
    • F16H61/4008
    • F15B7/006F15B2211/20538F15B2211/20561F15B2211/20576F15B2211/27F15B2211/3052F15B2211/50536F15B2211/613F15B2211/6336F15B2211/7054F15B2211/7656F16H61/4139
    • PROBLEM TO BE SOLVED: To provide a hydraulic closed circuit system in which, even while a portion to be driven can be driven by a hydraulic fluid of a high flow, fine position control can be performed on the portion to be driven.SOLUTION: A hydraulic closed circuit system 100 capable of driving a hydraulic cylinder 3 is provided with: a hydraulic pump 1; an electric motor 2 for controlling the rotation of the hydraulic pump 1; a shuttle valve 7 in which a secondary side port 7b communicates with a first conduit C1 and a secondary side port 7c communicates with a second conduit C2; a charge pump 5 in which an ejection port communicates with a primary side port 7a of the shuttle valve 7; and a relief valve 8 which makes the charge pressure of the charge pump 5 a set pressure. The charge pump 5 maintains the first conduit C1 and the second conduit C2 at a charge pressure through the shuttle valve 7. The relief valve 8 can change the set pressure.
    • 要解决的问题:提供一种液压闭路系统,其中即使在被驱动的部分可以由高流量的液压流体驱动的情况下,也可以对要驱动的部分进行精细位置控制。解决方案:A 能够驱动液压缸3的液压闭路系统100设置有:液压泵1; 用于控制液压泵1的旋转的电动机2; 二次侧端口7b与第一管道C1连通的梭阀7和次级侧端口7c与第二管道C2连通; 电动泵5,其中喷射口与梭阀7的一次侧端口7a连通; 以及使电荷泵5的充气压力成为设定压力的安全阀8。 电荷泵5通过梭阀7将第一导管C1和第二导管C2保持在充电压力下。安全阀8可以改变设定压力。