The working principle of a hydraulic motor is as follows

A hydraulic motor is a mechanical device that achieves power transmission through a piston shaft between a series of bearings driven by hydraulic pistons. It consists of components such as hydraulic pistons, piston pins, bearings, crankshafts, bevel gears, and turbines.

Its working principle is as follows: The pressure provided by the hydraulic source causes the hydraulic pistons to move, resulting in corresponding reciprocating motion of the piston pins. This motion compresses and releases the liquid secured within the working cylinder by the piston pins, generating continuously varying expansive forces that sustain the reciprocating motion of the piston pins. A large volume of liquid, moved by the motion of the piston pins, passes through the outlet of the piston cylinder and is directed via the high-pressure pipe at the outlet piston tank to the side inlet or outlet of the motor. This process converts hydraulic energy into mechanical energy, which is then transmitted to the output shaft of the motor, achieving the purpose of the hydraulic motor.

Additionally, another advantage of hydraulic motors lies in their output power regulation capability. They can adjust the output power according to the actual demands of the power system by altering flow rate, pressure, and rotational speed—a feat impossible with mechanical motors.

Therefore, hydraulic motors can not only meet the actual mechanical power requirements but also eliminate the difficulties associated with regulating the output power of mechanical motors, making them a continuously evolving new type of power unit in recent years. Their working principle involves transmitting the compressed hydraulic piston force to the engine and converting it into mechanical energy to achieve the purpose of the hydraulic motor.