The high temperature bearing factory () has organized a list of the causes and solutions for the frequent replacement of bearings for reference. Reasons and solutions for frequent bearing replacements 1. The grease or oil fails, and the model selection is incorrect. Ask the oil dealer to determine the correct form of lubricant. 2. Low oil level or insufficient grease. The lubricating oil must be lower than the center of the lowest rolling element. The grease in the bearing box fills about 1/3 to 1/2 of the space 3. The internal clearance of the bearing is not appropriate. If the shaft is heated and expands when heated, choose a bearing with a suitable internal clearance, such as changing from standard grade to C3 or C3 to C4 4. Lubrication If the agent is contaminated by foreign objects such as dirt, sand, toner, etc., clean the bearing box, replace the new oil seal or improve the oil seal, and inject fresh lubricant. 5. Water, acid, paint or other corrosive substances enter the bearing box with a protective moisture-proof cover 6. The shaft box is twisted and deformed or the inner hole is not round. Measure the inner hole size of the bearing box and turn it if it is too small. The non-fixed end bearing is changed from a cylindrical braided bearing to a deep groove ball bearing, which may cause the box hole to be tight or Small 7. The bearing housing is not cleaned before assembling the bearing. Clean the bearing housing and add fresh lubricant. 8. When the airflow passes through, the bearing oil leaks. For example, the airflow from the fan flows through the bearing and installs the windshield to divert the airflow. Use grease if possible. 9. Bearings are positioned crosswise. Gaskets are added between the bearing box and the box cover flange to release the preload on the bearings. 10. There are two positioning bearings on one shaft. Excessive axial expansion results in insufficient internal clearance of the bearing The end cover of the bearing box is moved outward, and the axial clearance of the outer ring of the bearing is adjusted by inserting a gasket, so that the bearing can move freely axially. 11. The journal is too small or the locking sleeve of the journal is not locked enough to spray the surface of the journal and grind it. Re-tighten the sleeve to the specified size or re-tighten the sleeve 12. Tighten the sleeve too much, loosen the set screw and sleeve, and re-tighten to a sufficient tightening force, but must ensure that the bearing can rotate freely 13. The oil is separated from the bearing housing surface Excessive leakage Use a thin layer of sealing paint will help prevent oil leaks Do not use adjusting shims, replace the bearing housing if necessary 14. The machine is unbalanced and the load is too large, or the bearing hole is too large Rebalance the machine, or replace the correct hole diameter Bearing housing 15. Composite uneven distribution on the bearing due to deformation of the shaft and bearing hole box Rework the shaft and bearing housing holes for proper shape and fit. However, it is usually necessary to replace a new shaft or bearing housing. 16. Inappropriate pillow block support causes bending of the shaft. Re-chamfering of the shaft to relieve stress may require the addition of a shoulder snap ring. 17. The bearing is insufficiently supported in the bearing housing, resulting in The outer ring is twisted and the chamfer of the bearing housing is reworked to relieve stress. It may be necessary to add a shoulder snap ring. 18. Shoulder and bearing seal friction Rework the shoulder to eliminate friction 19. Bearing seal deformation Rework the empty shoulder of the bearing housing to avoid Open bearing seal cover 20. Shaft and inner ring are deformed, bearing inner ring expands unevenly Remachine shaft chamfer to obtain proper support 21. Bearing box and outer ring deform, bearing is squeezed Remachine bearing box chamfer to obtain proper 22. Rotary oil seal or dust slinger rubs against static parts Check the far-running clearance of the rotary oil seal or dust slinger to avoid friction and prevent misalignment 23. The oil level is incorrect, and there is no lubricant in the bearing. Blockage, make the oil level display correct The cup is installed too high or too low, or the oil level is not higher than the center of the lowermost rolling element when it is installed in the position opposite to the bearing rotation, or the constant oil level cup is installed in the exact position consistent with the bearing rotation direction 26. 27. The bearing installation method is incorrect, replace the new bearing by hammering the bearing, and standardize the shaft installation. 28. The excessive wear of the bearing contact oil seal leads to the loss of lubricant and contamination. 29. Shaft shoulder or box hole shoulder or lock nut is not perpendicular to the bearing position to re-machine the part to obtain good verticality 30. The oversized machining of the journal causes If the internal clearance of the bearing is too small, grind the journal so that the shaft and the bearing can be properly matched. Village set to suitable size
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