27 Reasons Why Bearings Make a Noise

Bearings play a crucial role in mechanical equipment, yet many users have reported experiencing noises during operation. This raises the question of what specific causes are responsible for these sounds. After a summary by our technical team, we can understand the various reasons behind bearing noises. Below, we analyze the 27 causes of bearing noises.

1. Contamination of the bearing with sand or carbon particles, acting as an abrasive. 2. The presence of moisture, acids, or paint in the bearing, causing corrosion. 3. Insufficient clearance in the bearing (improper fit selection). 4. Incorrect choice of lubricant or grease type. 5. Inadequate lubrication (low oil level, oil or grease leakage through seals). 6. The bearing is flattened by the housing bore (improper bore roundness or歪曲不直twisted). 7. The bottom surface of the bearing housing is uneven (causing bore deformation or cracks in the housing). 8. Debris in the housing bore (remaining chips, dust particles, etc.). 9. The seal is eccentric (contacting adjacent parts and causing friction). 10. The bearing is subjected to additional loads (axial constraint on the bearing or two fixed-end bearings on a single shaft). 11. Excessive thermal elongation of the shaft (static indeterminate axial additional load on the bearing). 12. Insufficient clearance in the bearing, too tight during rotation (over-tightened retaining sleeve). 13. Noise in the bearing (end face of the roller or ball sliding). 14. Loose fit between the bearing and shaft (shaft diameter too small or retaining sleeve not tightened properly). 15. Excessive shoulder on the shaft (contacting the bearing's seal and causing friction). 16. The shoulder on the housing bore is too large (distorting the bearing's sealing components). 17. Too small gap in the labyrinth seal (friction with the shaft). 18. Bent teeth on the locking washer (contacting the bearing and causing friction). 19. Inappropriate position of the oil spewer (contacting the flange cover and causing friction). 20. Pressed dents on the balls or rollers (caused by hammering the bearing during installation). 21. Noise in the bearing (interference from external vibration sources). 22. The shaft is overheated and deformed (caused by using a torch to heat the bearing for removal). 23. The shaft is too thick, causing an actual tight fit (resulting in high bearing temperature or noise). 24. Noise in the bearing (micro-erosion). 25. The housing bore diameter is too large, resulting in a loose fit (high bearing temperature due to outer ring slippage). 26. The housing bore has expanded (expansion due to thermal expansion or expansion of the bearing housing bore). 27. The bore diameter is too small (resulting in high bearing temperature).

Here are the 27 reasons we've introduced for bearing noise. When encountering issues, it's essential to analyze the cause based on the actual situation before seeking a solution. If you're unsure how to handle a problem during the operation, feel free to consult the relevant personnel.