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- Politecnico di Milano
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- Mechanical Engineering
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- Costruzione di Macchine 1
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rolling contact bearing load rating and life load ratings •static loading: C0 slow rotation, slow oscillation, extended inactivity •dynamic loading: C normal operating conditions at high speed failure and “life” •static failure: inacceptable total permanent deformation •dynamic life: L10 operation up to the first sign of metal fatigue in 10% of a population basic rating life •according to ISO 281:1990 L =basic rating life (at 90% reliability) [millions of revolutions] L =basic rating life (at 90% reliability) [operating hours] C =basic dynamic load rating, kN] P =equivalent dynamic bearing load [kN] n =rotational speed [r/min] p =exponent of the life equation 3 for ball bearings, 10/3 for roller bearings
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