Hydraulic Drive System
    31.
    发明申请
    Hydraulic Drive System 审中-公开
    液压驱动系统

    公开(公告)号:US20090031719A1

    公开(公告)日:2009-02-05

    申请号:US11576559

    申请日:2006-05-08

    IPC分类号: F15B11/17 F15B13/06

    摘要: The hydraulic drive system comprises an engine 1, a pump unit 100, a plurality of actuators 5a, 5b and 5c, a control valve unit 4, and engine revolution speed detecting means 4f. The pump unit 100 includes a pump tilting control mechanism 8 for load sensing control, and the control valve unit 4 includes a plurality of flow control valves 15a, 15b and 15c and pressure compensation valves 10a, 10b and 10c. The engine revolution speed detecting means 4f includes a first differential pressure reducing valve 14 for outputting, as an absolute value, a pressure depending on an engine revolution speed. The output pressure of the first differential pressure reducing valve 14 is introduced, as a target load-sensing differential pressure, to the pump tilting mechanism 8 via a line 127.

    摘要翻译: 液压驱动系统包括发动机1,泵单元100,多个致动器5a,5b和5c,控制阀单元4和发动机转速检测装置4f。 泵单元100包括用于负载感测控制的泵倾转控制机构8,并且控制阀单元4包括多个流量控制阀15a,15b和15c以及压力补偿阀10a,10b和10c。 发动机转速检测装置4f包括用于输出取决于发动机转速的压力作为绝对值的第一差压减压阀14。 第一差压减压阀14的输出压力通过管线127作为目标载荷感测差压引入泵倾斜机构8。

    Hydraulic drive device
    32.
    发明授权
    Hydraulic drive device 失效
    液压驱动装置

    公开(公告)号:US06651428B2

    公开(公告)日:2003-11-25

    申请号:US10018575

    申请日:2001-12-20

    IPC分类号: F16D3102

    摘要: Differential pressures across flow control valves 6a, 6b and 6c are controlled by pressure compensating valves 7a, 7b and 7c to be held at the same value, i.e., a differential pressure &Dgr;PLS, and the differential pressure &Dgr;PLS is maintained at a target differential pressure &Dgr;PLSref by a pump displacement control unit 5. For changing the target differential pressure depending on change in revolution speed of an engine 1, a flow detecting valve 31 is disposed in a delivery line 30a, 30b of a fixed displacement hydraulic pump 30, and a differential pressure &Dgr;Pp across a variable throttle portion 31a of the flow detecting valve 31 is introduced to a setting controller 32. A selector valve 50 operable to shift between a fully closed position and a throttle position is disposed in parallel to the flow detecting valve 31 and is shifted by a control lever 51.

    摘要翻译: 流量控制阀6a,6b和6c之间的差压由压力补偿阀7a,7b和7c控制以保持在相同的值,即差压DeltaPLS,并且差压DeltaPLS保持在目标压差DeltaPLSref 通过泵排量控制单元5.为了根据发动机1的转速的变化来改变目标压差,流量检测阀31设置在固定排量液压泵30的输送管线30a,30b中,差速器 流量检测阀31的可变节流部31a的压力DeltaPp被引入到设定控制器32.可操作以在完全关闭位置和节气门位置之间移动的选择阀50与流量检测阀31并联设置,并且 由控制杆51移动。