Multiple hydraulic control circuits with pressure compensated flow control and a single variable delivery pump
    22.
    发明授权
    Multiple hydraulic control circuits with pressure compensated flow control and a single variable delivery pump 失效
    具有压力补偿流量控制和单变量输送泵的多液压控制电路

    公开(公告)号:US3861145A

    公开(公告)日:1975-01-21

    申请号:US40236773

    申请日:1973-10-01

    CPC classification number: F15B13/0417

    Abstract: A fluid delivery system is provided having multiple hydraulic control circuits and a variable displacement pump controlled by a pressure compensated servo control which is responsive to circuit pressure for regulating pump displacement and thus provide pump output commensurate with demand from the load circuits. A control mechanism including a control valve has a pair of variable orifices in series which are created by the main control valve spool and a pressure compensated flow control spool in serial arrangement therewith precisely controls the fluid volume flow to a load system in proportion to the opening of the variable orifices. A pressure compensated servo control is adapted to move the swash plate of the pump to a minimum displacement position when all of the closed center control valves are in neutral position thereby minimizing engine horsepower loss while maintaining sufficient system pressure to provide immediate response when one of the control valves is opened.

    Abstract translation: 提供了具有多个液压控制回路和由压力补偿伺服控制器控制的可变排量泵的流体输送系统,所述压力补偿伺服控制器响应用于调节泵排量的回路压力,因此提供与来自负载回路的需求相当的泵输出。 包括控制阀的控制机构具有一对串联的可变孔口,它们由主控制阀芯和与其串联配置的压力补偿流量控制阀芯产生,可精确控制与开口成比例的负载系统的流体体积流量 的可变孔。 压力补偿伺服控制器适于在所有的闭合中心控制阀处于中立位置时将泵的斜板移动到最小位移位置,从而使发动机马力损失最小化,同时保持足够的系统压力以便当其中一个 控制阀打开。

Patent Agency Ranking