Hydraulic motor Common points with hydraulic pump:

1. From the basic principle, the hydraulic motor and hydraulic pump are reversible. If the motor is used to pull, the hydraulic energy (working pressure and total flow) is derived, which is the hydraulic pump; If the working pressure oil is imported and the mechanical energy (torque and rotation speed) is exported, it becomes a hydraulic motor.

2. In terms of structure, the two are similar.

3. From the basic working principle, both of them use the change of capacity in closed work to carry out oil removal and drainage. For hydraulic pumps, oil is sucked when the capacity is expanded during operation, and high-pressure oil flows out when the capacity is reduced during operation. For hydraulic motors, high pressure oil is fed when the capacity is expanded during operation, and low pressure oil is discharged when the capacity is reduced during operation.

Differences between hydraulic motor and hydraulic pump:

1. The hydraulic pump is a conversion equipment that converts the mechanical energy of the motor into hydraulic energy, derives the total flow and working pressure, and has high expected capacity and working efficiency; The hydraulic motor is a device that converts the working pressure energy of liquid into mechanical energy, derives torque and rotational speed, and expects high mechanical energy. Therefore, the hydraulic pump is an energy equipment, and the hydraulic motor is a running component.

2. The steering system of the outlet shaft of the hydraulic motor must be able to rotate clockwise and inversely, so its structure is symmetrical; However, some hydraulic pumps (such as gear oil pump, vane pump, etc.) have very clear requirements for the steering system, which can only rotate unilaterally and can not change the rotation direction at will.

3. Besides the oil inlet and outlet, the hydraulic motor also has an independent oil outlet; Generally, the hydraulic pump has only oil inlet and outlet (except for the hydraulic plunger pump), and the leaked hydraulic oil is interconnected with the oil inlet.

4. The capacity and working efficiency of the hydraulic motor is lower than that of the hydraulic pump; Generally, the rotation speed of hydraulic pump is relatively high during operation, while that of hydraulic motor is relatively low. In addition, the gear oil pump has a large oil drain port and a small oil drain port, while Gear hydraulic motor The size of oil suction and drain ports of is the same; The number of teeth of the gear motor is larger than that of the gear oil pump; The impeller blades of the vane pump must be assembled obliquely, while the impeller blades of the impeller vane motor are assembled radially; The impeller vane of the impeller vane motor is a swallow spring plate at the root, which makes it clamped on the surface layer of the motor stator, while the impeller vane of the vane pump is clamped on the surface layer of the motor stator by the action of the working pressure oil and eccentric force at the root.