由于壓力油作用，受力不平衡使轉(zhuǎn)子產(chǎn)生轉(zhuǎn)矩。葉片式液壓馬達(dá)的輸出轉(zhuǎn)矩與液壓馬達(dá)的排量和液壓馬達(dá)進(jìn)出油口之間的壓力差有關(guān)，其轉(zhuǎn)速由輸入液壓馬達(dá)的流量大小來決定。由于液壓馬達(dá)一般都要求能正反轉(zhuǎn)，所以葉片式液壓馬達(dá)的葉片要徑向放置。為了使葉片根部始終通有壓力油，在回、壓油腔通入葉片根部的通路上應(yīng)設(shè)置單向閥，為了確保葉片式液壓馬達(dá)在壓力油通入后能正常啟動，必須使葉片頂部和定子內(nèi)表面緊密接觸，以保證良好的密封，因此在葉片根部應(yīng)設(shè)置預(yù)緊彈簧。葉片式液壓馬達(dá)體積小、轉(zhuǎn)動慣量小、動作靈敏、可適用于換向頻率較高的場合；但泄漏量較大、低速工作時不穩(wěn)定。因此葉片式液壓馬達(dá)一般用于轉(zhuǎn)速高、轉(zhuǎn)矩小和動作要求靈敏的場合。

Due to the action of pressure oil, the unbalanced force makes the rotor produce torque. The output torque of the vane hydraulic motor is related to the displacement of the hydraulic motor and the pressure difference between the inlet and outlet of the hydraulic motor, and its speed is determined by the flow of the input hydraulic motor. Since hydraulic motors generally require positive and negative rotation, the blades of vane hydraulic motors should be placed radially. In order to ensure that the blade root is always filled with pressure oil, a check valve should be set on the path from the return and pressure oil chamber to the blade root. In order to ensure that the blade type hydraulic motor can start normally after the pressure oil is connected, the top of the blade must be in close contact with the inner surface of the stator to ensure a good seal. Therefore, a pre tightening spring should be set at the blade root. The vane hydraulic motor has small volume, small moment of inertia, sensitive action, and can be used in occasions with high commutation frequency; However, the leakage is large and unstable at low speed. Therefore, vane hydraulic motors are generally used in occasions with high speed, small torque and sensitive action requirements.