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Bearings
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Fatigue life calculations assume the dispersion in life of
identical ball bearings operating under identical conditions, a statistical result is
obtained for bearing fatigue life. For most calculations, the life is that 90
percent of a group of apparently identical bearings will complete or exceed
before the area of spalling reaches predetermined size criterion. If handled,
mounted, maintained, lubricated and used in the right way, the life of the
bearing will normally reach and even exceed the calculated L10 life.
In the case of single row ball bearings and where a, a2, a3 can be
considered equal to one, the equations may be simplified as follows:
Ln = Life in hours
L10 = Life in hours
CE = Extended Basic Dynamic Load Rating – Radial
Ball bearings Pounds or Newton's
fB = Dynamic Load rating Adjustment factor for Number
of Adjacently Mounted Bearings
a1 = Life adjustment Factor for reliability (see
vendor)
a2 = Life adjustment Factor for Ball Bearing Material
a3 = Life adjustment Factor for Application
Conditions
N = Operating Speed – R.P.M.
P = Equivalent Radial Load on Bearing Pounds or Newton's
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