Equivalent bearing load as a result of radial and axial bearing loads
Equivalent dynamic load
$$ P_{dyn} = {X \cdot F_r + Y \cdot F_a} $$
Basic rating life of a ball bearing in revolutions.
Ball bearing revolutions
$$ L_{bearing_{rev_{ball}}} = {a_1 \cdot \left({ {C \over P_{dyn}} }\right) ^ 3} $$
Values for a1
Reliability % | a1 |
90 | 1 |
95 | 0.64 |
96 | 0.55 |
97 | 0.47 |
98 | 0.37 |
99 | 0.25 |
Basic rating life of a roller bearing in hours.
Roller bearing hours
$$ L_{bearing_{hr_{roller}}} = {{10 ^ 6 \over \left({ 60 \cdot n }\right)} \cdot L_{bearing_{rev_{ball}}}} $$