Load sensing hydraulic system with high pressure cut-off bypass
    1.
    发明授权
    Load sensing hydraulic system with high pressure cut-off bypass 有权
    负载传感液压系统带有高压截止旁路

    公开(公告)号:US6094911A

    公开(公告)日:2000-08-01

    申请号:US216441

    申请日:1998-12-18

    Abstract: A hydraulic system having a load sensing capability with a high pressure cut-off either operational or bypass is disclosed. The hydraulic system includes a pump having variable displacement under control of a pump control signal, a signal duplicator, at least one pressure relief device operable in cooperation with the signal duplicator, and at least one working element driven by the pump. The system includes a high pressure cut-off selector operable in a first mode to allow the signal duplicator to provide the control signal, and in another mode to allow a true signal to control the pump. The system includes a differential relief valve operable to prevent relief flow therethrough when the signal duplicator pressure exceeds the pump output pressure, and to allow relief flow therethrough when pump pressure exceeds the signal duplicator pressure, such that a load sensing capability is maintained under high pump pressure conditions using either the duplicator signal or the true signal for pump control.

    Abstract translation: 公开了一种具有负载感测能力的液压系统,其具有操作或旁路的高压截止。 液压系统包括在泵控制信号的控制下具有可变位移的泵,信号复制器,与信号复制器协作操作的至少一个减压装置以及由泵驱动的至少一个工作元件。 该系统包括一个高压截止选择器,可在第一模式下操作,以允许信号复制器提供控制信号,另一种方式允许真实信号控制泵。 该系统包括一个差动减压阀,当信号复制器压力超过泵的输出压力时,可以防止溢流流过其中,并且当泵的压力超过信号复制器的压力时允许溢流流过,从而在高泵下保持负载检测能力 使用复印机信号或用于泵控制的真实信号的压力条件。

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