液压泵和液压马达的分类
液压系统中使用的液压泵都是容积式泵，它是通过一个封闭容积的变化来实现吸油和压油过程的。当封闭容积从小变大时，进行吸油：从大变小时，进行压油。液压泵按其每转输出的液体体积（又称排量）是否可变，分为变量泵和定量泵。对于定量泵，只能采取改变转速的方法才能改变泵的流量。液压泵有各种结构形式，常用的有四种：齿轮式，叶片式，柱塞式和螺杆式。齿轮泵。双作用叶片泵及螺杆泵都为定量泵。
液压执行元件只要有液压马达，液压缸和摆动液压缸三类，后者也称为摆动液压马达。液压马达根据结构形式的不同可分为齿轮马达，叶片马达，柱塞马达等；根据几何排量能否调节，可分为定量马达和变量马达；根据用途可分为高速小转矩马达和低速大转矩马达。

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