液壓泵和液壓馬達的分類
液壓系統中使用的液壓泵都是容積式泵，它是通過一個封閉容積的變化來實現吸油和壓油過程的。當封閉容積從小變大時，進行吸油：從大變小時，進行壓油。液壓泵按其每轉輸出的液體體積（又稱排量）是否可變，分為變量泵和定量泵。對于定量泵，只能采取改變轉速的方法才能改變泵的流量。液壓泵有各種結構形式，常用的有四種：齒輪式，葉片式，柱塞式和螺桿式。齒輪泵。雙作用葉片泵及螺桿泵都為定量泵。
液壓執行元件只要有液壓馬達，液壓缸和擺動液壓缸三類，后者也稱為擺動液壓馬達。液壓馬達根據結構形式的不同可分為齒輪馬達，葉片馬達，柱塞馬達等；根據幾何排量能否調節，可分為定量馬達和變量馬達；根據用途可分為高速小轉矩馬達和低速大轉矩馬達。

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