Contact fatigue spalling occurred in the bearing surface, often accompanied by fatigue crack, starting with the maximum alternating shear stress at the contact surfaces of the following, and then extended to the surface to form a different shape of spalling, such as point-like pitting or pitting peeling flaking into small pieces called shallow spalling. Because the the flaking surface gradually expand, while often extended to the deep, forming deep peeling. The deep peel off contact fatigue failure fatigue source.
Continuous wear will cause the bearing parts gradually corrupted and eventually lead to bearing loss of dimensional accuracy and other relevant issues. Wear may affect the shape change, with the gap increasing and work surface topography changes, may affect the lubricant to pollution caused the complete loss of the lubricating function to achieve the necessary degree, thereby bearing the loss of rotation accuracy even can not be normal operation. The Wear Failure is one of the common failure mode of all kinds of bearings, wear form usually can be divided into the most common abrasive wear and adhesive wear.
Oil lubricating method includes:
Drip lubrication 1.
The drip lubrication is suitable for quantitative supply lubricating oil was bearing components, drip volume generally every 3-8 seconds a drop is appropriate, too much oil will cause increased bearing temperature.
2 cycle oil lubrication
With a pump the filtered oil is supplied to the bearing member, filtered again after cooling through the bearing lubricating oil. Bearing cooling cycle oil must be the heat can be taken away, and therefore the method is suitable for high speed bearing parts.
3 oil bath lubrication
Oil bath lubrication is the most common method of lubrication, for low, medium speed bearing lubrication, the bearing part is immersed in by the groove, the lubricating oil by the rotation of the bearing parts brought up, and then to flow back to the sump oil should be slightly lower than the lowest the center of the rolling bodies.
4 jet lubrication
With a pump to the high pressure oil through the nozzle incident bearing, incident on the oil in the bearings in the other end via a bearing into the oil sump. Bearing rotates at high speed, the rolling body and the retainer so that the surrounding air with a relatively high rotational speed to form a gas stream, with the general method of lubrication is difficult in the lubricating oil to the bearings must be used high-pressure injection method, then the lubricating oil spray to the bearing, the position of the nozzle should be placed on the inner ring and between the holder center.
5. Spray lubrication
Formed by mixing with dry compressed air through the sprayer with the lubricating oil mist, ejection bearing, airflow can be effectively cool the bearing and preventing intrusion. This method is suitable for high-speed, high-temperature lubrication of the bearing components.


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