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齒輪馬達
齒輪馬達在結構上為了適應正反轉要求，進出油口相等、具有對稱性、有單外泄油口，將軸承部分的泄漏油引出殼體外;為了減少啟動摩擦力矩，采用滾動軸承;為了減少轉矩脈動，齒輪液壓馬達的齒數比泵的齒數要多。
齒輪液壓馬達由干密封性差、容積效率較低、輸入油壓力不能過高、不能產生較大轉矩。并且瞬間轉速和轉矩隨著嚙合點的位置變化而變化，因此齒輪液壓馬達僅適合于高速小轉矩的場合。一般用于工程機械、農業機械以及對轉矩均勻性要求不高的機械設備上。
工作原理，當壓力油經固定的配油軸4的窗口進入缸體內柱塞的底部時，柱塞向外伸出，緊緊頂住定子的內壁，由于定子與缸體存在一偏心距。在柱塞與定子接觸處，定子對柱塞的反作用力為 。力可分解為和 兩個分力。當作用在柱塞底部的油液壓力為p，柱塞直徑為d，力和之間的夾角為X時，力對缸體產生一轉矩，使缸體旋轉。缸體再通過端面連接的傳動軸向外輸出轉矩和轉速。以析的一個柱塞產生轉矩的情況，由于在壓油區作用有好幾個柱塞，在這些柱塞上所產生的轉矩都使缸體旋轉，并輸出轉矩。徑向柱塞液壓馬達多用于低速大轉矩的情況下。CALZONI卡桑尼 MR300D-N1T1N1N1N0401
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液壓馬達亦稱為油馬達，主要應用于注塑機械、船舶、起揚機、工程機械、建筑機械、煤礦機械、礦山機械、冶金機械、船舶機械、石油化工、港口機械等。高速馬達齒輪馬達具有體積小、重量輕、結構簡單、工藝性好、對油液的污染不敏感、耐沖擊和慣性小等優點。缺點有扭矩脈動較大、效率較低、起動扭矩較小(僅為額定扭矩的60%--70%)和低速穩定性差等。
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CALZON液壓馬達MR700F*C*/45420
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但是，由于液壓馬達和液壓泵的工作條件不同，對它們的性能要求也不一樣，所以同類型的液壓馬達和液壓泵之間，仍存在許多差別。首先液壓馬達應能夠正、反轉，因而要求其內部結構對稱;液壓馬達的轉速范圍需要足夠大，特別對它的穩定轉速有一定的要求。因此，它通常都采用滾動軸承或靜壓滑動軸承;其次液壓馬達由于在輸入壓力油條件下工作，因而不必具備自吸能力，但需要一定的初始密封性，才能提供必要的起動轉矩。由于存在著這些差別，使得液壓馬達和液壓泵在結構上比較相似，但不能可逆工作。MR500F-F1N1N1S1NX0701/58323
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折疊低速馬達
轉速低于500r/min的液壓馬達屬于低速液壓馬達。它的基本形式是徑向柱塞式。低速液壓馬達的主要特點是:排量大，體積大，轉速低，可以直接與工作機構連接，不需要減速裝置，使傳動機構大大簡化，低速液壓馬達的輸出扭矩較大，可達幾千到幾萬Nm，因此又稱為低速大扭矩液壓馬達。