HYDRAULIC DRIVE SYSTEM
    6.
    发明申请
    HYDRAULIC DRIVE SYSTEM 有权
    液压驱动系统

    公开(公告)号:US20140123639A1

    公开(公告)日:2014-05-08

    申请号:US14129414

    申请日:2012-08-13

    IPC分类号: F15B15/02

    摘要: A hydraulic driving system includes a hydraulic cylinder with a cylinder tube and a cylinder rod, a main pump, a hydraulic-fluid path, a charge pump, a stroke position detecting unit, and a pump control unit. The hydraulic-fluid path forms a closed circuit between a main pump and the hydraulic cylinder. The cylinder rod expands or contracts depending on how hydraulic fluid is supplied and exhausted to and from first and second chambers. The charge pump replenishes hydraulic-fluid in the hydraulic-fluid path. The pump control unit performs flow-rate reduction control in which the pump control unit reduces a suction flow rate so that a suction flow rate of the main pump is equal to or less than a maximum discharge flow rate of the charge pump when the stroke position becomes closer to a stroke end of the cylinder rod than a prescribed reference position during the flow rate reduction control.

    摘要翻译: 液压驱动系统包括具有气缸管和气缸杆的液压缸,主泵,液压流路,充电泵,行程位置检测单元和泵控制单元。 液压路径在主泵和液压缸之间形成闭合回路。 气缸杆根据液压油如何供给和排出到第一和第二室进行膨胀或收缩。 电荷泵补充液压流体路径中的液压流体。 泵控制单元执行流量降低控制,其中,泵控制单元降低吸入流量,使得当泵的行程位置(3)时主泵的吸入流量等于或小于电动泵的最大排出流量 在流量降低控制期间比在规定的基准位置更靠近气缸杆的行程端。

    HYDRAULIC DRIVE SYSTEM
    10.
    发明申请
    HYDRAULIC DRIVE SYSTEM 有权
    液压驱动系统

    公开(公告)号:US20140345265A1

    公开(公告)日:2014-11-27

    申请号:US14356705

    申请日:2012-09-11

    IPC分类号: F15B1/04

    摘要: An operating state determining unit determines whether a hydraulic cylinder is in operation or not in operation. A discharge pressure reducing unit reduces the discharge pressure of a charge pump. A discharge pressure control unit controls the discharge pressure reducing unit when the hydraulic cylinder in not in operation to reduce the discharge pressure of the charge pump to a low pressure lower than a normal pressure. The normal pressure is the discharge pressure of the charge pump when the hydraulic cylinder is in operation. An accumulator is connected to a charge flowpath. A one-way valve is disposed between the accumulator and the charge pump. The one-way valve allows the flow of hydraulic fluid from the charge pump to the accumulator and prohibits the flow of hydraulic fluid from the accumulator to the charge pump.

    摘要翻译: 操作状态确定单元确定液压缸是否在操作中。 排出压力降低单元降低电荷泵的排出压力。 当不操作液压缸时,排出压力控制单元控制排出压力降低单元,以将电荷泵的排出压力降低到低于常压的低压。 正常压力是液压缸运行时电荷泵的排出压力。 蓄电池连接到充电流路。 蓄能器和电荷泵之间设有一个单向阀。 单向阀允许液压流体从充电泵流到蓄能器,并且禁止液压流体从蓄能器流到电荷泵。