1. The groove tilt flake:

In the working plane bearing a tilt spalling band, explain bearing is in state of the tilt work, when specifically to meet or exceed the critical condition, easy early form abnormal wear and sharply peeling. The reasons of the main because installation is bad, the shaft deflection, the shaft neck and have low accuracy housing holes, and take measures to ensure the quality and improve the bearing installed shaft shoulder to shoulder, hole axial beating precision.

2. Rings fracture:

Contractor fracture failure in a rare, is often caused by sudden overload. Reason is more complicated, such as bearing raw materials defects (bubble, shrinkage), forging defects (a burning), heat treatment defects (overheating), processing defects (local burns or surface of micro cracks), main defects (installation bad, lubrication, instantaneous overload poor), once the impact load by overload or violent vibration are likely to fracture collar. Take measures to avoid overload impact load, and the choice of appropriate over surplus quantity, improve installation precision, improve service conditions and strengthen bearing manufacturing process of the quality control.

3. The groove in circumference direction of symmetry position flake:
Symmetry position, spalling performance circle around for spalling band, and a week between to flake symmetry position (namely the elliptical short axis direction), the reason mainly because housing holes too big or two separate elliptical shell pore structure, this in the motorcycle with the camshaft bearing especially in. When bearing pressure into the elliptic partial big housing holes or two separate enclosure solid tight, make bearing outer ring produce elliptic, in a short axis clearance significantly reduce or even negative clearance. Bearing in under the effect of load, the inner ring of rotation to produce weeks spalling trace, outer ring in a short axis direction only symmetry position produce spalling trace. This is the major failure modes of the early bearing, through the analysis of the bearing failure parts inspection shows that the bearing outside diameter roundness already from the original process control of 0.8 u m into 27 μ m. This value is far greater than the radial clearance value. Therefore, to be sure the bearing is in serious deformation and negative clearance, the working plane early form abnormal sharply to wear and spalling. The strategy is to improve the machining accuracy housing holes or using the least possible housing holes two separate structure.
 



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