Reasons and treatment methods for overheating of motor bearings:

1. Incorrect assembly of bearings, tight or loose fit tolerances.

Solution: The mission performance of a bearing not only depends on its own construction accuracy, but also has nothing to do with the dimensional accuracy, form and position tolerances, detail roughness, selected fit, and correct assembly of its common shafts and holes. In individual horizontal motors, excellent assembled rolling bearings only bear radial stress. However, if the fit between the inner bearing ring and the shaft is too tight, or if the fit between the outer bearing ring and the end cap is too tight, that is, the interference is too large, after assembly, the bearing clearance will become too small, unintentionally or even close to zero. This makes the rotation inflexible and generates heat during operation. If the fit of the bearing inner race to the shaft is too loose, or the fit of the bearing outer race to the end cap is too loose, relative rolling between the bearing inner race and the shaft, or between the bearing outer race and the end cap, will occur, resulting in conflicting fever, causing overheating of the bearing. Generally, the tolerance zone for the inner diameter of the bearing inner race, which is used as a reference machine, is moved below the zero line in the standard. The tolerance zone for the same shaft formed by the split bearing seat manufacturer and the bearing inner race is much tighter than the fit formed by it and the individual reference hole.

2. Improper selection of grease or improper handling and protection, poor moral character or deterioration of grease, or mixing with dust and impurities can cause bearing fever.

Solution: Adding an appropriate amount or too little of grease can also cause a bearing fever, because when too much grease is added, there will be a significant conflict between the changed part of the bearing and the grease, and when too little grease is added, there may be dry conflicts and fever. Therefore, it is necessary to adjust the amount of grease so that it is about 1/2-2/3 of the space volume of the bearing chamber. Unsuitable or deteriorated grease should be cleaned and replaced with suitable and clean grease.

3. The axial clearance between the outer bearing cover of the motor and the outer circle of the rolling bearing is too small.

Solution: Large and medium-sized motors individually use ball bearings at the non shaft extension end. Roller bearings are used at the shaft extension end. When the rotor is heated and expanded, it can or may not stretch freely. Due to the use of ball bearings at both ends of small motors, there should be an appropriate gap between the outer bearing cap and the outer ring of the bearing. Otherwise, the bearing may generate heat due to excessive axial thermal elongation. When such weather occurs, the front or rear bearing covers should be removed a little, or a thin paper pad should be placed between the bearing cover and the end cover to form a sufficient gap between the outer bearing cover at one end and the outer bearing ring.

4. The end covers or bearing covers on both sides of the motor are not installed properly.

Solution: If the end caps or bearing caps on both sides of the motor are not installed in parallel or the seams are not tightly fastened, the ball will deflect from the track and cause heating. The end caps or bearing caps on both sides must be reinstalled and fixed evenly with bolts.

5. The ball, roller, inner and outer rings, and ball rack are severely worn or metal peeling occurs.

Solution: The bearing should be updated at this time.

6. Poor connection to the load machine.

The main reasons are: poor coupling assembly, excessive belt tension, inconsistent shaft center of the loading machine, too small pulley diameter, too far away from the bearing, excessive axial or radial load, etc.

Solution: Correct incorrect connections and avoid bearings bearing abnormal forces.

7. The shaft is bent.

Solution: At this time, the shaft bearing force is no longer a purely radial force, resulting in bearing heating. Try to straighten or replace the bent shaft with a new one.