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Normally, Hydraulic motor It refers to the energy conversion device that outputs rotary motion and converts the hydraulic energy provided by the hydraulic pump into mechanical energy stay Hydraulic transmission In the system, hydraulic motor and hydraulic cylinder are the two major output actuators, which are widely used in mechanical engineering, agriculture, military, aerospace and other fields.

According to the structure type, hydraulic motors can be divided into gear type, impeller type, plunger type and other types. According to the rated speed of the hydraulic motor, it can be divided into high speed and low speed. Calibration speed higher than 500rpm belongs to High speed hydraulic motor , while the calibrated speed is lower than 500rpm Low speed hydraulic motor 。 Its basic types are gear type, screw type, vane type and axial plunger type. Its main characteristics are high speed, small moment of inertia, convenient starting and braking, and high adjustment (speed adjustment and reversing) sensitivity. As the output torque of high-speed hydraulic motor is generally small, it is also called high-speed small torque hydraulic motor. Crawler traveling hydraulic motor Its basic type is radial plunger type, in addition, there are axial plunger, vane type, gear type and other structural types, High torque hydraulic motor Low speed hydraulic motor is mainly characterized by large displacement, large volume and low speed (sometimes a few revolutions per minute or even a few revolutions per minute), so it can be directly connected to the working mechanism; It does not need a reducer, greatly simplifying the transmission mechanism. Usually, the output torque of low-speed hydraulic motor is large, so it is also called Low speed high torque hydraulic motor 。