The invention provides a hydraulic driving device of a hydraulic excavator, which can improve the operability of the arm digging and bucket composite operation. In with the first hydraulic pump (11) with the directional control valve is connected in series parallel bucket (16) with directional control valve and the second arm (18), and second hydraulic pump (12) with the direction control valve connected to the first arm (21) of the hydraulic driving device of hydraulic excavator, with the bucket (6) digging operation, to inhibit the second arm with directional control valve (18) hydraulic oil supply traffic control device. The traffic control device comprises a setting with second arm with directional control valve (18) of the supply port connected to the roundabout beside the pathway (29a), in order to control the opening amount with the bucket with an operating device (28) to the side of the excavation operation and smaller variable throttle valve (30).
【技术实现步骤摘要】
【技术保护点】
1.一种液压挖掘机的液压驱动装置,其设置在具备与旋转体上下方向可转动地连接,且含有臂和铲斗、及臂液压缸和铲斗液压缸的前部作业机的液压挖掘机中,其具备:发动机、通过该发动机驱动的第一液压泵、第二液压泵及先导泵、相对于所述第一液压泵分别并联串联连接、控制向所述铲斗液压缸供给的液压油的流动的铲斗用方向控制阀、及控制向所述臂液压缸供给的液压油的流动的第二臂用方向控制阀、以及与所述第二液压泵连接的第一臂用方向控制阀,所述液压驱动装置的特征在于,具备流量抑制装置,其在所述铲斗操作时,抑制向所述第二臂用方向控制阀供给的液压油的流量。
【技术特征摘要】
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【专利技术属性】
技术研发人员:萩原直树,冈野康雄,中村刚志,石川广二,中村和则,
申请(专利权)人:日立建机株式会社,
类型:发明
国别省市:JP
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