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    • 5. 发明公开
    • Hydraulic drive system
    • 液压驱动系统
    • EP0445703A3
    • 1992-04-08
    • EP91103234.0
    • 1991-03-04
    • HITACHI CONSTRUCTION MACHINERY CO., LTD.KAYABA INDUSTRY CO., LTD.
    • Hirata, ToichiTanaka, HideakiNakamura, KazunoriKoiwai, HideshiTakahashi, Yoneaki
    • E02F9/22
    • E02F9/2232E02F9/2217Y10T137/87185
    • A hydraulic drive system comprises a flow control valve (21) having variable restrictors (19-22) to control a flow rate of the hydraulic fluid, a pressure compensating valve (17) for holding constant a differential pressure across the variable restrictor (19, 20), and a recovery circuit (40) having a recovery line (42) with a check valve (43) allowing only a flow of the hydraulic fluid toward the supply line (23). Through the recovery circuit (40) hydraulic fluid returns to the supply line (23) at a portion between the pressure compensating valve (17) and the variable restrictor (19, 20) upon controlling by the variable restrictor (21, 22). A third variable restrictor (41) disposed in the return line (26) controls a recovery pressure of the hydraulic fluid returned to the supply line (23) and is arranged to change its restriction amount dependent upon an input amount of the flow rate control valve (11).
    • 一种液压驱动系统包括:流量控制阀(21),其具有用于控制液压流体的流量的可变限流器(19-22);压力补偿阀(17),其用于保持恒定可变限流器(19,20) 20)和具有回流管路(42)的回收回路(40),所述回收管路具有止回阀(43),仅允许液压流体流向供应管路(23)。 通过回收回路(40),在可变节流阀(21,22)的控制下,液压流体在压力补偿阀(17)和可变节流阀(19,20)之间的部分返回到供应管路(23)。 设置在回流管线(26)中的第三可变节流器(41)控制返回到供应管线(23)的液压流体的回收压力,并且布置成根据流量控制阀 (11)。
    • 6. 发明公开
    • Hydraulic drive system
    • Hydraulisch angetriebenes系统。
    • EP0445703A2
    • 1991-09-11
    • EP91103234.0
    • 1991-03-04
    • HITACHI CONSTRUCTION MACHINERY CO., LTD.KAYABA INDUSTRY CO., LTD.
    • Hirata, ToichiTanaka, HideakiNakamura, KazunoriKoiwai, HideshiTakahashi, Yoneaki
    • E02F9/22
    • E02F9/2232E02F9/2217Y10T137/87185
    • A hydraulic drive system comprises a flow control valve (21) having variable restrictors (19-22) to control a flow rate of the hydraulic fluid, a pressure compensating valve (17) for holding constant a differential pressure across the variable restrictor (19, 20), and a recovery circuit (40) having a recovery line (42) with a check valve (43) allowing only a flow of the hydraulic fluid toward the supply line (23). Through the recovery circuit (40) hydraulic fluid returns to the supply line (23) at a portion between the pressure compensating valve (17) and the variable restrictor (19, 20) upon controlling by the variable restrictor (21, 22). A third variable restrictor (41) disposed in the return line (26) controls a recovery pressure of the hydraulic fluid returned to the supply line (23) and is arranged to change its restriction amount dependent upon an input amount of the flow rate control valve (11).
    • 液压驱动系统包括具有可变节流器(19-22)的流量控制阀(21),用于控制液压流体的流量;压力补偿阀(17),用于保持横跨可变节流器 20)和具有仅允许液压流体朝向供给管线(23)流动的止回阀(43)的回收管线(42)的回收回路(40)。 通过恢复电路(40),在由可变节流器(21,22)控制时,液压流体在压力补偿阀(17)和可变节流器(19,20)之间的部分处返回供给管线(23)。 设置在返回管线(26)中的第三变​​量限制器(41)控制返回到供给管线(23)的液压流体的回收压力,并且被设置为根据流量控制阀的输入量来改变其限制量 (11)。