As the most important components in the hydraulic transmission system, the hydraulic pump and the hydraulic motor, one is the power component, the other is the executive component, one converts mechanical energy into hydraulic energy, and the other converts hydraulic energy into mechanical energy. Complex mechanical movement and stronger mechanical torque are provided, so what is the difference between them?

Similarities between hydraulic motors and hydraulic pumps
1. In principle, hydraulic motors and hydraulic pumps are reversible. If driven by an electric motor, the output is pressure energy (pressure and flow), which is the hydraulic pump; if pressure oil is input, the output is mechanical energy (torque and flow). speed), it becomes a hydraulic motor. This is like the relationship between a generator and a motor, as long as some specific parameters are changed, the opposite working process can be realized.

2. From a structural point of view, the two are similar.

3. The hydraulic motor and the hydraulic pump have the same basic structural elements - a closed volume that can be changed periodically and a corresponding oil distribution mechanism. The working principle of the hydraulic motor and the hydraulic pump is to use the change of the sealed working volume to absorb and discharge oil.

For hydraulic pumps, oil is sucked when the working volume increases and high-pressure oil is discharged when the working volume decreases. For hydraulic motors, high-pressure oil enters when the working volume increases and low-pressure oil is discharged when the working volume decreases.

Differences between hydraulic motors and hydraulic pumps

1. The hydraulic pump is a conversion device that converts the mechanical energy of the motor into hydraulic energy. It outputs flow and pressure. It is hoped that the volumetric efficiency will be high; the hydraulic motor is a conversion device that converts the pressure energy of the liquid into mechanical energy. It outputs torque and speed. It is hoped that the mechanical efficiency. Therefore, the hydraulic pump is the power component, and the hydraulic motor is the executive component.

2. The steering of the output shaft of the 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 on the steering, and can only rotate in one direction, not at will Change the selection direction.

3. In addition to the oil inlet and outlet, the hydraulic motor also has a separate oil leakage port; the hydraulic pump generally only has the oil inlet and outlet (except for the axial piston pump), and the oil leakage in it communicates with the oil inlet.

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

5. Generally, 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 port and the oil discharge port of the gear hydraulic motor are the same sizes.

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

8. The vane of the vane pump must be installed obliquely, while the vane of the vane motor is installed radially; the vane of the vane motor relies on the swallow spring at the root to make it pressed against the surface of the stator, while the vane of the vane pump relies on the pressure of the root The oil and centrifugal force compress the stator surface.

In terms of the working principle, both hydraulic motors and hydraulic pumps work by changing the volume of the sealed working chamber. However, due to their different purposes and structures, they generally cannot be directly used interchangeably.

Zhejiang Daye Auto Parts Co., Ltd. is a manufacturer of hydraulic pumps for tractor gear pumps in China. It provides wholesale sales of hydraulic pumps. Welcome to consult.