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Remedial measures for rolling bearing fatigue caused by poor lubrication

by:JNSN     2021-12-21
Phenomenon (1): Different types of failure of rolling bearings will occur under different loads under poor lubrication conditions. When the load is low and there is slippage, fine surface peeling will occur. Because they are numerous and look like pits on the raceway, see Figure 49. We use pitting to describe it. When the load is large and the lubricating oil film becomes thinner, such as water intrusion, when the raceway (Figure 29) is polished under pressure, shell-shaped pits will appear, see Figure 50. When the load is high and the lubrication is poor, there will be a very obvious heated area on the raceway, and after continuing to run, an initial crack will appear. Reasons: Poor lubrication is caused by the following reasons: Insufficient lubricant supply. Too high working temperature. Water intrusion causes excessive friction and material stress on the raceway surface. Sometimes there is slippage. Remedial measures: Increase the amount of lubricant and use high-viscosity lubricants, and try hard It is possible to use the tested EP additive cooling lubricant/bearing to use softer grease as much as possible to prevent the intrusion of water and fatigue caused by wear. Phenomenon (2): For example, there is peeling on the rolling elements of tapered roller bearings, see Figures 51 and 52. Band trajectory, see Figure 68. Reason: The lubricant is contaminated, such as seal damage, which leads to the ingress of external particles, causing the bearing parts to wear in the rolling contact area, which causes the geometric shape of the parts to change. The result of local overload is partly related to improper adjustment of tapered roller bearings. Remedial measures: timely replacement of lubricants, filtering of lubricants, improvement of seals, timely replacement of damaged seals, special heat treatment of ferrules and rollers, fatigue caused by fracture of the hardened layer. Phenomenon (3): The surface of the bearing parts is hardened, and the raceway is peeled off in large pieces. Cause: The cracking or separation of the hardened layer is too large or the depth of the hardened layer under a given load is insufficient, such as due to an incorrect design load. Remedy: Adjust the depth of the hardened layer to adapt to the load condition to avoid overloading the removed bearing evaluation operation Features and damage rolling contact mode 51: Wear in different areas can change the geometric shape of the contact area of u200bu200bthe part, and even local overload leads to fatigue failure a: the cross-sectional profile of the roller; b: the inner ring raceway and roller with fatigue damage son. 52: The fatigue mechanism is shown in Figure 51, the raceway edge is worn, and the cross-sectional profile of the roller is shown in Figure 69.
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