?液壓馬達(dá)是由兩個(gè)活塞分別推動(dòng)和控制的當(dāng)活塞往復(fù)運(yùn)動(dòng)時(shí)，推動(dòng)液體的往復(fù)運(yùn)動(dòng)，因此液體在活塞桿上的壓力可以傳遞，從而帶動(dòng)液體流動(dòng)，這就是馬達(dá)產(chǎn)生動(dòng)力的原理當(dāng)液壓油壓力超過額定值時(shí)，可以將油壓縮成油 壓或氣壓，使油在液體中以壓力形式流動(dòng).當(dāng)液體壓力達(dá)到油壓時(shí)，油就變成液體通過管路輸送到壓力閥；液體被排出時(shí)，這時(shí)壓力油和液體中所含的壓力釋放，壓力液體即為油（或壓入介質(zhì)）。
在制造液壓馬達(dá)的過程中，所有的零部件都是通過數(shù)控機(jī)床加工出來的因此可以使用更好的數(shù)控機(jī)床來進(jìn)行加工制造例如，在制造過程中，會(huì)需要大量的機(jī)器零件，因此對(duì)于這些零件的維護(hù)是必不可少的而液壓馬達(dá)又 有著其獨(dú)特的優(yōu)勢(shì)所在，對(duì)于這些零件來說，維護(hù)是非常簡(jiǎn)單和容易的一件事情。
而且維護(hù)費(fèi)用較低，所以它在機(jī)械制造業(yè)中非常受歡迎 體積小，重量輕，體積重量比同排量的齒輪泵要小，而且體積也小所以在應(yīng)用中，很少需要大型的機(jī)械傳動(dòng)裝置在沒有機(jī)械傳動(dòng)裝置時(shí)，可由電動(dòng)機(jī)驅(qū)動(dòng)還可由一個(gè)工作單元驅(qū)動(dòng)另一個(gè)工作單元。
因?yàn)橛鸵涸诹鲃?dòng)中是流動(dòng)的，所以油耗量很小，節(jié)約了能源 驅(qū)動(dòng)介質(zhì)為液壓油，可以使用普通機(jī)械傳動(dòng)的液壓泵，也可以使用具有多種驅(qū)動(dòng)功能的液壓泵，但如果使用流量很大，并且要求嚴(yán)格控制流量的系統(tǒng)或負(fù)載時(shí)，可選用特殊液壓泵，如使用粘度較大，但流量一般較小的離心泵。
這種液壓泵一般不需要特殊設(shè)備，只是使用了一種驅(qū)動(dòng)裝置，所以它也被稱為液壓泵這種泵主要有以下幾種類型:1、直接用油驅(qū)動(dòng)2、采用特殊液壓油（或使用液壓油）或合成油驅(qū)動(dòng)油（或電）由電機(jī)提供動(dòng)力時(shí)，可用電動(dòng)機(jī)直接帶動(dòng)液壓泵進(jìn)行工作。
油缸和機(jī)械傳動(dòng)裝置用油進(jìn)行潤(rùn)滑加工后，在油與液介質(zhì)的接觸面上形成油膜，密封或用活塞上蓋或氣隙，以防止油箱內(nèi)產(chǎn)生真空或油液流出或油漏出（在工作時(shí)形成油路）由于油與液壓油組成了具有高粘度、高潤(rùn)滑性、耐高溫和耐腐蝕性和抗老化能力強(qiáng)且潤(rùn)滑效果好等優(yōu)點(diǎn)的油液，所以在一般工作環(huán)境中使用較為廣泛。
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