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    HYDRAULIC DRIVE SYSTEM
    6.
    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

    申请人： Teruo Akiyama ,  Noboru Iida ,  Kenji Oshima ,  Kenji Sasano

    发明人： Teruo Akiyama ,  Noboru Iida ,  Kenji Oshima ,  Kenji Sasano

    IPC分类号： F15B1/04

    CPC分类号： F15B1/04 ,  E02F9/2217 ,  E02F9/2235 ,  E02F9/2285 ,  E02F9/2289 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/17 ,  F15B2211/20546 ,  F15B2211/20561 ,  F15B2211/20576 ,  F15B2211/275 ,  F15B2211/30525 ,  F15B2211/327 ,  F15B2211/613 ,  F15B2211/625 ,  F15B2211/6306 ,  F15B2211/633 ,  F15B2211/6346 ,  F15B2211/7053

    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。

    Work machine
    10.
    发明授权
    Work machine 有权

    公开(公告)号：US11946226B2

    公开(公告)日：2024-04-02

    申请号：US18023784

    申请日：2021-12-17

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： Masatoshi Hoshino ,  Seiji Hijikata ,  Yasutaka Tsuruga ,  Ryou Yagisawa ,  Shou Furukawa

    IPC分类号： E02F9/22 ,  F15B11/16

    CPC分类号： E02F9/2235 ,  E02F9/2246 ,  E02F9/2296 ,  F15B11/165 ,  F15B2211/2658 ,  F15B2211/275 ,  F15B2211/633 ,  F15B2211/6651 ,  F15B2211/6652

    摘要： Provided is a work machine capable of achieving both low fuel consumption and ensuring of workability. The work machine is configured to, in a state where an output of an engine or hydraulic pump has increased to an increase threshold (S12: Yes) with the rotational speed being at a first rotational speed (S11: Yes), raise the rotational speed from the first rotational speed to a second rotational speed (S13); in a process of raising the rotational speed to the second rotational speed, output, to a regulator, a signal instructing reduction in the discharge rate (S14) so as to keep the output of the engine or hydraulic pump constant; and after the rotational speed has reached the second rotational speed, output, to the regulator, a signal instructing increase in the discharge rate (S16) so as to make the output of the engine or hydraulic pump have a value corresponding to a request load.