The Difference Between Hydraulic Motor And Hydraulic Pump

1. The hydraulic pump is a conversion device that converts the mechanical energy of the motor into hydraulic energy, outputs the flow and pressure, and hopes to have high volumetric efficiency; The hydraulic motor is a conversion device that converts the pressure energy of the liquid into mechanical energy, outputs torque and speed, and hopes to have high mechanical efficiency. Therefore, the hydraulic pump is an energy device, and the hydraulic motor is the actuator.

2. The steering of the output shaft of the hydraulic motor must be able to rotate forward and reverse, so its structure is symmetrical; Some hydraulic pumps (such as gear pumps, vane pumps, etc.) have clear regulations for steering, which can only rotate in one direction and cannot change the direction of selection at will.

3. In addition to the oil inlet and outlet, the hydraulic motor also has a separate oil leakage port; Hydraulic pumps generally only have oil inlet and outlet ports (except axial piston pumps), and the oil leakage in them communicates with the oil inlet.

4. The volumetric efficiency of hydraulic motor is lower than that of hydraulic pump.

5. Usually the working speed of the hydraulic pump is relatively high, while the output speed of the hydraulic motor is low.

6. In addition, the oil suction port of the gear pump is large and the oil discharge port is small, while the suction and oil discharge ports of the gear hydraulic motor are the same size.

7. The gear motor has more teeth than the gear pump.

8. The blades of the vane pump should be installed obliquely, while the blades of the vane motor should be installed radially; The blades of the vane motor rely on the swallow spring at the root to make it pressed on the surface of the stator, while the blade of the vane pump is pressed on the surface of the stator by the pressure oil and centrifugal force of the root.

From the working principle, the hydraulic motor and the hydraulic pump rely on the change of the volume of the sealing working chamber to work, but due to the different purposes of use of the two, there are many differences in the structure, and generally cannot be directly reversed and universal.