柱塞泵是靠柱塞在缸体中作往复运动造成密封容积的变化来实现吸油与压油的液压泵，与齿轮泵和叶 片泵相比，这种泵有许多优点。首先，构成密封容积的零件为圆柱形的柱塞和缸孔，加工方便，可得到较 高的配合精度，密封性能好，在高压工作仍有较高的容积效率；第二，只需改变柱塞的工作行程就能改变 流量，易于实现变量；第三，柱塞泵中的主要零件均受压应力作用，材料强度性能可得到充分利用。由于 柱塞泵压力高，结构紧凑，效率高，流量调节方便，故在需要高压、大流量、大功率的系统中和流量需要调节的场合，如龙门刨床、拉床、液压机、工程机械、矿山冶金机械、船舶上得到广泛的应用。柱塞泵按柱 塞的排列和运动方向不同，可分为径向柱塞泵和轴向柱塞泵两大类。
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