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液压传动中由液压元件（液压油泵）、液压控制元件（各种液压阀）、液压执行元件（液压缸和液压马达等）、液压辅件（管道和蓄能器等）和液压油组成的液压系统。

液压泵把机械能转换成液体的压力能，液压控制阀和液压辅件控制液压介质的压力、流量和流动方向，将液压泵输出的压力能传给执行元件，执行元件将液体压力能转换为机械能，以完成要求的动作