The reason why the rolling bearing has abnormal noise and the treatment method
1, the motor roller has abnormal sound processing method
When the motor is running, a screwdriver can be used, the tip is placed on the bearing cover, and the ear is close to the wooden handle of the screwdriver to monitor the sound of the bearing. For example, the rolling element has a vague rolling sound in the inner and outer rings, and the sound is monotonous and uniform, which makes people feel relaxed, indicating that the bearing is good and the motor is running normally. If you hear an abnormal sound, you should analyze the cause and deal with it.
1.1 I heard obvious rolling and vibration of the rolling elements, indicating that the bearing clearance is too large or severely worn and needs to be replaced.
1.2 The rolling element sounds dull and the tone is heavy, indicating that the bearing grease is too dirty and impurities are invaded. It is necessary to clean the bearing with kerosene and replace it with new one.
1.3 The rolling element has irregular impact sound, indicating that the bearing has individual rolling elements broken and needs to be replaced.
1.4 Approximate whistle sound, mixed with the rolling sound of the rolling element, indicating that the bearing lacks grease or improper selection of lubricating oil, need to add clean lubricating oil or replace the appropriate lubricating oil.
2. Causes and treatment of rolling bearing heating
2.1 The motor is left for too long, the lubricating grease is deteriorated and hardened; new grease should be replaced.
2.2 The lubricating oil added in the bearing chamber is too much or too little, and should be added between 1/3-2/3 of the volume of the bearing chamber; and the lubricating oil of the same type should be added regularly according to the requirements of the motor description.
2.3 There are debris in the bearing chamber. It is necessary to clean the bearing with kerosene and replace it with new one.
2.4 If the bearing wear is too large or the inner ring and outer ring are broken, the new bearing of the same type should be replaced.
2.5 Motor running vibration, improperly installed coupling, too tight transmission belt and bending of the shaft will cause the bearing to heat up; the cause should be excluded according to the situation.
2.6 The bearing is not attached to the shoulder, the bearing cap is disassembled, and the inner ring of the bearing is pressed with a copper rod symmetrically with a hammer.
2.7 The end cap or bearing cap is poorly assembled and should be reassembled so that the end caps of the two ends are well matched with the brackets of the base, and the fastening bolts of the bearing caps are tightened diagonally.
2.8 The working performance of the rolling bearing depends not only on the manufacturing precision of the bearing itself, but also on the dimensional accuracy, shape tolerance and surface roughness of the shaft and the hole to be matched with it, the matching of the selection and the correct installation.
If the inner ring of the bearing is too tightly fitted with the shaft, or if the outer ring of the bearing and the inner hole of the end cap bearing are too tightly fitted, that is, if the public surplus is too large, the bearing clearance will become too small, sometimes even close to zero. In this way, the bearing is not flexible, and it will heat up during operation and even burn out the bearing.
However, if the inner ring of the bearing is loosely fitted with the shaft, or the outer ring of the bearing and the end cover are loosely fitted, the inner ring of the bearing and the shaft, or the outer ring of the bearing and the end cap, will move relative to each other during operation, and the friction is heated. Causes the bearing to overheat. The appropriate interference fit between the inner ring of the rolling bearing and the shaft and the cooperation of the outer ring and the end cap of the rolling bearing are generally over-matched. The tolerances of these are shown in the manual or the manual.
