推荐回答（4个）
简单来说，液压马达是以液体油料为动力驱动转子转动，液压泵是将液体油料加压成一定压力，产生动能的过程。再简单点说就是液压马达需要油压（消耗油压），而液压泵是产生油压的。（生产油压）。应该明白了吧。
液压泵是把机械能转化为液压能
液压马达是液压能转化为机械能
液压泵——是将电能转化成液压能（也就是压力能，油管里面流体的压力）
液压马达——是将液压能转化成机械能（可转动的，和电机差不多）
液压马达一般是用在高容量低速运转以及无法获得电力的地方，比如搅拌车（运输混凝土的）
液压马达可以利用很小的扭力，类似千斤顶一样，一个人就可以利用很小的力支撑起几千甚至上万吨都没问题，只要设计的比例足够；
以上 拙见
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