Bearing parameters
kN
From bearing catalogue
kN
P = X·Fr + Y·Fa
rpm
Equivalent dynamic load — radial bearing
kN
kN
—
Typical: 0.19–0.44 (deep groove ball)
Results
Bearing life vs. C/P ratio — operating point marked
Formulas — ISO 281
Basic rating life
L10 = (C/P)^p [10⁶ rev]p = 3 (ball bearings)
p = 10/3 (roller bearings)
L10h = L10·10⁶ / (60·n)
Reliability-adjusted life
L10m = a1 · L10 [10⁶ rev]L10mh = a1 · L10h [hours]