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    • 1. 发明授权
    • Hydraulic drive system for civil engineering and construction machinery
    • 土木工程机械液压驱动系统
    • US4561824A
    • 1985-12-31
    • US354386
    • 1982-03-02
    • Nobuya OkabeFumiki Nakagiri
    • Nobuya OkabeFumiki Nakagiri
    • E02F9/22F15B11/17F15B11/20
    • F15B11/17E02F9/2239E02F9/2292F15B2211/20576F15B2211/30565F15B2211/30595F15B2211/3116F15B2211/324F15B2211/40507F15B2211/45F15B2211/455F15B2211/7142
    • A hydraulic drive system for civil engineering and construction machinery in which at least first and second hydraulic circuits having at least first and second hydraulic pumps, respectively, are provided for driving a plurality of actuators such as left and right travelling actuators, a boom actuator and an arm actuator. The first circuit includes a first travelling directional control valve for one of the left and right travelling actuators located downstream of a first boom directional control valve for the boom actuator and a first arm directional control valve for the arm actuator that the latter to receive a hydraulic fluid supply from the first pump by taking priority over the first travelling valve. The second circuit includes a second travelling directional control valve for the other of the left and right travelling actuators upstream of a second boom directional control valve for the boom actuator and/or a second arm directional control valve for the arm actuator so as to be able to receive hydraulic fluid supply from the second pump by taking priority over the second boom and/or arm valves. A bypass circuit extends between the second pump and the one travelling actuator whereby a hydraulic fluid supply from the second pump can be received by the first travelling valve.
    • 一种用于土木工程机械的液压驱动系统,其中至少分别具有第一和第二液压泵的第一和第二液压回路被设置用于驱动多个致动器,例如左右行驶致动器,动臂致动器和 一个手臂执行器。 第一回路包括用于左右行驶致动器中的一个的第一行驶方向控制阀,位于用于悬臂致动器的第一起重臂方向控制阀的下游,以及用于臂致动器的第一臂方向控制阀,后者用于接收液压 通过优先于第一行进阀来从第一泵供给液体。 第二回路包括用于悬臂致动器的第二起重臂方向控制阀和/或臂致动器的第二臂方向控制阀上游的左右行驶致动器中的另一个的第二行进方向控制阀,以便能够 通过优先于第二起重臂和/或悬臂阀从第二泵接收液压流体供应。 旁路回路在第二泵和一个行进致动器之间延伸,从而可以由第一行进阀接收来自第二泵的液压流体供给。