Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?

In order to maintain the good performance of the bearing, daily maintenance, inspection, overhaul and prevention must be done. For long-term running equipment, the usual detection and tracking is particularly important, including the rotating sound, vibration, temperature and lubricant state of the bearing. According to the detection results, the equipment maintenance personnel can find and deal with the problems in time.Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?

Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?

Bearing noise often occurs during equipment operation, which may be due to the quality problem of the bearing itself or other reasons. Today, I’d like to share the reasons for bearing noise, hoping to help you.Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
If the bearing is in good continuous rotation state, it will make a low whine or buzzing sound. If there is a sharp hiss, squeak and other irregular sounds, it often indicates that the bearing is in poor continuous rotation condition. Sharp squeaking noises may be caused by improper lubrication. Improper bearing clearance can also cause metallic sound.Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
Dents on the track of the bearing outer ring will cause vibration and cause a smooth and crisp sound.Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
If there is intermittent noise, the rolling parts may be damaged. This sound occurs when the damaged surface is rolled out. If there are pollutants in the bearing, it will often cause a hissing sound. Serious bearing damage can produce irregular and loud noise.Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
If the knocking scar caused by installation will also produce noise, the noise will vary with the bearing speed.Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?

loud metal noise

Cause 1: abnormal load, countermeasures: study the bearing clearance, adjust the load and correct the position of the housing shoulder.
Cause 2: poor installation. Countermeasures: improve the machining accuracy of shaft and shell, and improve the installation accuracy and installation method.
Reason 3: insufficient or unsuitable lubricant. Countermeasures: Supplement lubricant and select appropriate lubricant.
Cause 4: the rotating parts are in contact. Countermeasure: modify the contact part of curved road seal.

► regular noise

Cause 1: indentation, corrosion or scar on the rolling surface caused by foreign matters. Countermeasures: replace bearings, clean relevant parts, improve sealing devices and use clean lubricants.
Cause 2: surface deformation (after steel carburization). Countermeasure: replace the bearing and pay attention to its use.
Cause 3: peeling of raceway surface. Countermeasure: replace the bearing.

► irregular noise

Reason 1: the clearance is too large. Countermeasures: study the fit and bearing clearance, and modify the preload.
Cause 2: foreign matter intrusion. Countermeasures: replace bearings, clean relevant parts, improve sealing devices and use clean lubricants.

Cause 3: spherical surface damage and peeling. Countermeasure: replace the bearing.

The teeth of the lock washer are bent (touching the bearing and rubbing);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
The position of the oil slinger is inappropriate (touching the flange cover and rubbing);
There are pressure pits on the steel ball or roller (caused by knocking the bearing with a hammer during installation);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
Bearing noise (interference from external vibration source);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
The bearing is discolored and deformed by heating (caused by removing the bearing by heating with a spray gun);
The shaft is too thick, which makes the actual fit too tight (resulting in excessive bearing temperature or noise);
The diameter of the seat hole is too small (resulting in excessive bearing temperature);
The diameter of the bearing seat hole is too large and the actual fit is too loose (the bearing temperature is too high and the outer ring slips);
The bearing seat hole becomes larger (the bearing seat hole of non-ferrous metal is supported larger, or becomes larger due to thermal expansion);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
Broken cage;
The bearing raceway is rusty;
Wear of steel ball and raceway (unqualified grinding or bumping of products);
The ferrule raceway is unqualified (manufacturer’s problem).
Precautions for bearing storage
Keep the original packaging and do not open it arbitrarily. If the packaging is damaged, it must be opened, carefully cleaned and repainted.
The relative humidity of the storage room shall not exceed 60%, and the temperature difference shall not be too large. The bearings placed in the original packaging can be stored for several years.
For sealed bearings or bearings with dust cover, the lubrication characteristics of the grease filled in the bearing may be reduced after long-term storage.Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
The storage room should also be protected from vibration and shaking. The bearings not stored in the original packaging shall be properly stored. It is strictly prohibited to put the bearings together with corrosive things to prevent corrosion and pollution.
Large rolling bearings can only be placed horizontally during storage, and the sides of the inner and outer rings are all supported. If stored upright, permanent deformation may be caused due to the heavy inner and outer rings and rolling parts and the relatively thin inner and outer ring walls.

30 causes of bearing noise

Impurities in grease;Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
Insufficient lubrication (oil level is too low and improper storage leads to oil or grease leakage through the seal);
The clearance of the bearing is too small or too large (problem of the manufacturer);
Impurities such as sand or carbon particles are mixed into the bearing to play the role of abrasive;
Dirt such as water, acid or paint is mixed into the bearing to corrode;
The bearing is flattened by the seat hole (the roundness of the seat hole is not good, or the seat hole is not straight);
The sizing block on the bottom surface of the bearing seat is uneven (resulting in seat hole deformation and even crack of the bearing seat);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
There are sundries in the bearing seat hole (residual chips, dust particles, etc.);
Friction occurs between adjacent parts (9. Contact with the sealing ring);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
The shaft bears additional load (the shaft bears axial tightness, or there are two fixed end bearings on one shaft);
The fit between the bearing and the shaft is too loose (the diameter of the shaft is too small or the tightening sleeve is not tightened);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
The clearance of the bearing is too small and it is too tight during rotation (the tightening sleeve is too tight);
Bearing noise (caused by roller end face or steel ball slipping);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?
The thermal elongation of the shaft is too large (the shaft bears static and indeterminate axial additional load);
The shaft shoulder is too large (touching the seal of the bearing and causing friction);
The shoulder of the seat hole is too large (it distorts the seal of the bearing);
.The clearance of labyrinth seal ring is too small (friction with shaft);Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise

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Bearings are often Encountered in our life. Do you know the 30 Reasons why Bearings Make Noise?