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Randomness Of Rolling Bearings' Elements Geometry As Probabilistic Factor Of Bearings Fatigue Life

Styp-Rekowski M.

Journal of Polish CIMAC

2009

Vol. 4, no 2

271-278

The great number of factors generate situations that real dimensions of each machine elements are different from nominal ones. In the case of rolling bearings elements mentioned disagreements are small – their values are rank of micrometers. However, such small differences can generate significant changes of operational features of bearings. The analysis of influence of ball dimensional deviation on load distribution in ball bearings is presented in this paper. The probability of occurrence of ball diameters of the range of acceptable values is statistically determined. Random distribution of this important dimensions results in other than nominal level of internal stresses (in the contact area of balls and raceways) and therefore true values of some operational features of bearings are other – the most often smaller – than calculated ones. In presented analysis sequence of occurrence of different ball diameters is also taken into account.