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How to deal with overheating of bearings in agricultural electric motors?

Views: 0     Author: Site Editor     Publish Time: 2023-11-23      Origin: Site

How to deal with overheating of bearings in agricultural electric motors?

Agricultural motors generally use small motors, and in small motors, ball bearings are generally used at the front and rear ends. Bearing heating is one of the most common faults in agricultural asynchronous motors. The bearing heats up, which can cause the lubricating grease to dilute and leak out, while in severe cases, it can damage the bearing and cause economic losses to the user. The reasons and treatment methods for bearing heating are introduced as follows:

1. Bearing damage. Check if the balls or bearing shells of the ball bearings are damaged. If there is any damage, it should be repaired or replaced.

2. The lubricating oil has impurities, is too dirty, the oil ring is stuck, or the brand is incorrect. The oil should be changed and the cause of the blockage should be identified for repair. When the oil viscosity is too high, the lubricating oil should be replaced.

3. There is a shortage of oil in the bearing chamber. Fill the 2/3 oil chamber with lubricating grease or add lubricating oil to the standard oil level line.

4. There is too much grease blockage in the rolling bearing, and the temperature of the lubricating oil in the sliding bearing is too low or too high. Excessive lubricating grease should be removed from the rolling bearing or thelubricating grease in the oil chamber should be filled to 2/3

5. If the fit between the bearing and the shaft or between the bearing and the end cover is too loose or too tight, it will cause deformation of the bearing, and if it is too loose, it is easy to cause "sleeve running". When the fit between the bearing and the shaft is too loose, the journal can be coated with metal paint, and when it is too tight, it can be reworked; If the bearing and end cover fit too loosely, insert the end cover tightly. If they are too tight, rework them.

6. The two end covers or bearing covers of the motor are not properly assembled, usually not parallel, resulting in the bearings not being in the correct position. Install the end caps or bearing caps flat and tighten the bolts.

7. The belt is too tight, too loose, or the coupling is poorly assembled. Adjust the belt tension; Correct the coupling.

8. The wrong bearing model was replaced during maintenance. Replace bearings with the correct model as soon as possible.

The measures to prevent cage noise are as follows:

a. In order to ensure stable rotation of the cage, it is necessary to use a ring guide method as much as possible and pay attention to providing sufficient lubrication to the guide surface. The structure of the tapered roller bearing under high-speed working conditions should be improved, and the L-shaped cage guided by the roller should be changed to a Z-shaped cage guided by the ring edge guard.

b. When the bearing rotates at high speed, the vibration amplitude of the cage for bearings with large pocket clearance is much greater than that for bearings with small pocket clearance, so the value of pocket clearance is particularly important.

c. Pay attention to minimizing radial clearance as much as possible.

d. Efforts should be made to improve the manufacturing accuracy and surface quality of the cage, which is beneficial for reducing the noise generated by collisions or friction between the rolling element and the cage.

e. Actively adopt advanced cleaning technology to effectively and thoroughly clean spare parts and assembled products, improving the cleanliness of bearings.


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