The sound of a functioning bearing
1. If the bearing is in a good continuous rotation state, it will emit a low whining or humming sound. Sharp hissing, squeaking and other irregular sounds often indicate that the bearing is in poor continuous rotational condition. A sharp squeaky noise can be caused by improper lubrication. Improper bearing clearance can also cause metallic sounds.
2. The dents in the track of the outer ring of the bearing cause vibration and cause a smooth and crisp sound.
3. If there is intermittent noise, it means that the rolling parts may be damaged. This sound occurs when the damaged surface is rolled over, and the presence of contaminants in the bearing often causes a hissing sound. Severe bearing damage can produce irregular and loud noises.
4. If it is caused by the knock scar caused during installation, it will also produce noise, and the noise will vary with the speed of the bearing.
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Abnormal bearing noise and its cause
According to other characteristics of noise, it can also be divided into large metal noise, regular noise and irregular noise.
Big metallic noise
Reason 1: Abnormal load, countermeasures: correct the fit, study the bearing clearance, adjust the load, and correct the position of the shell shoulder.
Reason 2: Poor installation, countermeasures: machining accuracy of shafts and housings, improvement of mounting accuracy and installation methods.
Reason 3: Insufficient or unsuitable lubricant, countermeasure: replenish lubricant and select appropriate lubricant.
Reason 4: There is contact between rotating parts, countermeasure: Modify the contact part of the curved road seal.
Regular noise
Cause 1: Indentation, rust or damage to the rolling surface caused by foreign matter, countermeasures: replace the bearing, clean the relevant parts, improve the sealing device, and use clean lubricants.
Reason 2: Surface deformation (after steel carburizing), countermeasure: Replace the bearing, pay attention to its use.
Reason 3: Raceway surface peeling, 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: Intrusion of foreign matter, countermeasures: study the replacement of bearings, cleaning of relevant parts, improvement of sealing devices, and use of clean lubricants.
Cause 3: Spherical injury, peeling, countermeasure: replace the bearing.
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30 reasons why bearings ring
1. There are impurities in the oil;
2. Insufficient lubrication (oil level is too low, improper storage leads to oil or grease leakage through the seal);
3. The clearance of the bearing is too small or too large (the manufacturer problem);
4. Impurities such as sand or carbon particles are mixed into the bearing to play the role of abrasive;
5. The bearing is mixed with water, acid or paint and other dirt, which plays a corrosive role;
6. 轴承被座孔夹扁(座孔的圆度不好,或座孔扭曲不直);
7. The horn of the bottom surface of the bearing seat is uneven (resulting in the deformation of the housing hole and even the crack of the bearing housing);
8. There are debris in the bearing seat bore (residual chips, dust particles, etc.);
9. Eccentricity of the sealing ring (touching adjacent parts and friction);
10. The bearing is subjected to additional load (the bearing is axially tightened, or there are two actuator bearings on one shaft);
11. The fit between the bearing and the shaft is too loose (the diameter of the shaft is too small or the adapter sleeve is not tightened);
12. The clearance of the bearing is too small, and it is too tight when rotating (the adapter sleeve is overtightened);
13. The bearing has noise (caused by the slippage of the end face of the roller or the steel ball);
14. The thermal elongation of the shaft is too large (the bearing is subjected to static and indefinite axial additional load);
15. The shoulder is too large (it touches the seal of the bearing and frictions);
16. The shoulder of the housing hole is too large (the seal of the bearing is distorted);
17. The gap of the labyrinth sealing ring is too small (friction with the shaft);
18. The teeth of the locking washer are bent (touching the bearing and friction occurs);
19. The position of the oil throwing ring is not suitable (touching the flange cover and rubbing);
20. There are pressure pits on the steel ball or roller (caused by hitting the bearing with a hammer during installation);
21. The bearing has noise (there is interference from external vibration sources);
22. The bearing is discolored and deformed by heating (caused by using a spray gun to heat and disassemble the bearing);
23. The shaft is too coarse, so that the actual fit is too tight (resulting in high bearing temperature or noise);
24. The diameter of the seat hole is too small (resulting in the bearing temperature being too high);
25. The diameter of the bearing seat hole is too large, and the actual fit is too loose (the bearing temperature is too high - the outer ring slips);
26. The bearing housing bore becomes larger (the bearing housing bore of non-ferrous metal is propped up, or becomes larger due to thermal expansion);
27. Cage breakage.
28. Rust in the bearing raceway.
29. Steel balls and raceways are worn (grinding processing is unqualified or the product is bruised).
30. The ferrule raceway is unqualified (the problem of the manufacturer).
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Detection methods and instruments for abnormal bearing noise
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Proper storage of bearings
1. Keep the original packaging, not open arbitrarily, if the packaging is damaged, it must be opened and cleaned carefully, and the packaging should be re-oiled.
2. The relative humidity of the storage room can not exceed 60%, the temperature difference can not be too large, and the bearings placed in the original packaging can be stored for several years. Sealed bearings or bearings with shields may have reduced lubricating properties of grease filled in the bearings after prolonged storage.
3. The storage room should also be protected from vibration and shaking. Bearings that are not stored in the original packaging should be properly kept, and it is strictly forbidden to put the bearings together with corrosive things to prevent corrosion and contamination.
4. Large rolling bearings can only be placed flat when stored, and the sides of the inner and outer rings should all be supported. If stored upright, permanent deformation may occur due to the heavier inner and outer rings and rolling parts, and the relatively thin inner and outer ring walls.
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