1. A hydraulic pump is a conversion device that converts the mechanical energy of an electric motor into hydraulic energy, outputs flow and pressure, and hopes for high volumetric efficiency; a hydraulic motor is a conversion device that converts the pressure energy of a liquid into mechanical energy, outputs torque and speed, and hopes for high mechanical efficiency. Therefore, a hydraulic pump is an energy device, and a hydraulic motor is an actuator.
2. The direction of the output shaft of a hydraulic motor must be able to rotate forward and reverse, so its structure is symmetrical; while some hydraulic pumps (such as gear pumps, vane pumps, etc.) have clear regulations for the direction of rotation, can only rotate in one direction, and cannot change the direction at will.
3. In addition to the inlet and outlet ports, hydraulic motors also have separate leakage ports; hydraulic pumps generally only have inlet and outlet ports (except axial piston pumps), and the leaked oil is connected to the inlet port.
4. The volumetric efficiency of a hydraulic motor is lower than that of a hydraulic pump.
5. Generally, the operating speed of a hydraulic pump is relatively high, while the output speed of a hydraulic motor is relatively low.
6. In addition, the gear pump has a large suction port and a small discharge port, while the suction and discharge ports of the gear hydraulic motor are the same size.
7. The number of teeth of the gear motor is more than that of the gear pump.
8. The blades of the vane pump must be installed obliquely, while the blades of the vane motor are installed radially; the blades of the vane motor rely on the swallow spring at the root to press them against the stator surface, while the blades of the vane pump rely on the pressure oil at the root and the centrifugal force to press them against the stator surface.
