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Influences of Bearing Life Considerations on Gear Drive Design

05FTM17

Author: Frank C. Uherek, Rexnord Geared Products
Historically, catalog gear drives have been designed with 5000 hours of L10 bearing life at service factor 1.0
power. Advances in bearing analysis methods have brought new considerations to the design and selection
process. The impact of new modeling techniques, additional considerations, and various extensions to the
traditional bearing fatigue calculations are explored. The modeling of these various additions to a traditional
catalog L10 calculation is illustrated by bearing selections for cases of single, double, and triple reduction gear
drives. A roadmap is presented listing critical considerations when applying various bearing manufacturer
recommendations.
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