圖4-4(a)是單葉片擺動(dòng)馬達(dá)若從油口Ⅰ通入高壓油，葉片2作逆時(shí)針擺動(dòng)，低壓力從油口Ⅱ排出由于葉片與輸出軸相連，幫助輸出軸擺動(dòng)輸出扭矩，克服負(fù)載 此類擺動(dòng)馬達(dá)的工作壓力小于10MPa，擺動(dòng)角度小于280°。
由于徑向力不平衡，葉片和殼體、葉片和擋塊之間密封困難，限制了其工作壓力的進(jìn)一步提高，從而也限制了輸出轉(zhuǎn)矩的進(jìn)一步提高 擺動(dòng)缸液壓電機(jī)工作原理 圖4-4(b)是雙葉片式擺動(dòng)馬達(dá)在徑向尺寸和工作壓力相同的情況下，單片擺動(dòng)電機(jī)的輸出轉(zhuǎn)矩是單片擺動(dòng)電機(jī)的兩倍，但旋轉(zhuǎn)角度應(yīng)相應(yīng)減小。
雙片擺動(dòng)電機(jī)的旋轉(zhuǎn)角度一般小于120° 葉片擺動(dòng)電機(jī)的總效率η=對于單葉擺動(dòng)電機(jī)，70%~95% 設(shè)其機(jī)械效率為1，出口背壓為零，則它的輸出轉(zhuǎn)矩： 式中：P為單葉片擺動(dòng)馬達(dá)的進(jìn)口壓力；B為葉片寬度；R1為葉片軸外半徑，葉片內(nèi)半徑；R2為葉片外半徑。
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