Phenomenon (1): Different loads will appear in different forms of rolling bearing damage under the condition of poor lubrication. When the load is low and there is slippage, fine skin peeling occurs. Because they are numerous and look like pits in the raceway. We use pitting to describe it. When the load is large and the lubricating oil film becomes thin, such as water intrusion, when the raceway is polished under pressure, shell-shaped dimples will appear. When the load is high and the lubrication is poor, there will be a very pronounced heated area on the raceway, and after continued operation, initial cracks will appear. Causes: – Poor lubrication due to: • Insufficient lubricant supply • Too high operating temperature • Water intrusion causing excessive friction and material stress on raceway surfaces – Sometimes there are slip remedies: – Increase lubricant quantity – Use high Lubricants of high viscosity and tested EP additives wherever possible – Cooling lubricants/bearings – Softer greases where possible – Prevents water ingress • Fatigue due to wear.

  Phenomenon (2): For example, there is spalling on the rolling elements of tapered roller bearings. ribbon track. Reason: Due to the contamination of the lubricant, such as the entry of foreign particles due to seal failure, the bearing parts are worn in the rolling contact area and the geometry of the parts changes. Part of the result of local overloading is also related to improper adjustment of tapered roller bearings. Remedial measures: – Timely change of lubricant – Filter of oil – Improvement of seals – Timely replacement of damaged seals – Special heat treatment of rings and rollers • Fatigue from fracture of hardened layer.

  Phenomenon (3): The surface-hardened bearing parts have large pieces of the raceway peeling off. Causes: – Cracking or separation of the hardened layer – Too much load or insufficient depth of the hardened layer for a given load, e.g. due to wrong design loads Remedy: – Adjust the depth of the hardened layer to the load conditions – Avoid overloading for removal Bearing Evaluation of Running Characteristics and Damage Rolling Contact Mode 51: Wear in different areas can change the geometry of the part’s contact area to the point that localized overloading leads to fatigue failure.