1) In terms of basic concepts, Hydraulic motor It is cross with the hydraulic pump. If the motor is used to promote, Small cycloidal hydraulic motor The output is the four column hydraulic function (working pressure and flow), which is the hydraulic pump; If working pressure oil is input and mechanical energy (torque and transmission ratio) of mechanical equipment is output, it becomes a hydraulic motor.

2) Structurally, they are similar.

3) From the basic principle, both of them are used to remove oil and drain oil based on the change of capacity in airtight work. For hydraulic pumps, Stepless variable hydraulic motor Absorb oil when the capacity expands during operation, and discharge high pressure oil when the capacity decreases during operation. For hydraulic motors, high pressure oil is fed when the capacity is expanded during operation, and bottom pressure oil is discharged when the capacity is reduced during operation.

Difference between hydraulic engine and hydraulic pump:

1) The hydraulic pump is a conversion machine that converts the mechanical energy of the mechanical equipment of the motor into the four column hydraulic function, outputs the flow and working pressure, and hopes to have high capacity efficiency; The hydraulic motor is a machine that converts the working pressure of the liquid into the mechanical energy of the mechanical equipment. It outputs torque and transmission ratio. It is hoped that the mechanical kinetic energy is high. Therefore, the hydraulic pump is an energy machine, while the hydraulic motor is an electronic device.

2) The output shaft of the hydraulic motor can be jogged and rotated as far as possible, so its structure is symmetrical; However, some hydraulic pumps (such as gear pump, variable plunger pump, etc.) have established regulations, which only rotate on one side and cannot change the rotation direction at will.

3) In addition to the oil inlet and outlet, the hydraulic motor also has a separate leakage oil inlet; Generally, the hydraulic pump has only oil inlet and outlet holes (except for the variable plunger pump), in which the leaked gear oil is connected to the oil inlet.

4) The capacity efficiency of the hydraulic motor is higher than that of the hydraulic pump.

5) Generally, the transmission ratio of hydraulic pump is relatively high while the output speed of hydraulic motor is relatively low. In addition, the oil removal port of the gear pump is large, the oil drain hole is small, and the transmission system drives Gear hydraulic motor The specifications of oil suction and drain holes are the same.