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.
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