374F Excavator Hydraulic System Caterpillar


General Information (Swing System)

Usage:

374F L AP4

回转液压系统

当回转操纵手柄移动以执行回转操作时,回转操纵手柄向机器 ECM 发送电气信号输入。

机器 ECM 向左回转马达处的回转停车制动器电磁阀发送一个电气信号。 当回转停车制动器电磁阀通电时,管路中的先导油流过电磁阀。 随后,先导油经油道流向回转停车制动器。 先导油还经过管路流向右回转马达的回转停车制动器。 先导油压力释放回转停车制动器。 回转停车制动器在供油流至回转马达前释放。

回转液压系统使用两个比例减压阀控制一个滑阀。 滑阀位于向回转马达供应高压油的主控制阀中部。

向回转液压回路输送的油仅由后泵供应。 当回转操纵手柄移开空档位置时,机器 ECM 启用回转制动器电磁阀。 回转停车制动器随后分离。 马达旋转总成开始转动。 回转马达安装在回转驱动上部。 而回转驱动安装在上部结构上。 回转驱动分两级降低马达转速。 此外,回转驱动带动上部结构旋转。

回转马达是一个固定排量双向活塞式液压马达。 回转马达有一个连接到输出轴上的小齿轮。 小齿轮与大回转齿轮(回转轴承)的内部齿轮轮齿接合。 回转齿轮固定在底盘系统结构上。 当回转马达转动时,上部结构在底盘系统结构上方旋转。

回转系统的其他部件包括:

  • 回转比例电磁阀

  • 回转控制阀

  • 回转马达

  • 反作用阀

  • 回转停车制动器和回转停车制动器电磁阀

  • 回转驱动

注: 请参阅本手册中的相应章节,了解更多信息。

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