Fatigue Performance Improvements of Wheel Bearing Rolling Elements

Paper #:
  • 2017-01-2524

Published:
  • 2017-09-17
Abstract:
Wheel bearings are a safety critical automotive components. For this application the steel rolling elements are subjected to fatigue failure and therefore play a key role in overall bearing fatigue life performance. This performance is influenced by metallurgical, mechanical, and physical properties obtained by precise manufacturing process parameters. These properties are continuously analyzed and are evolving at all bearing manufacturing companies. NN Precision Bearing Component Group (PBC), a worldwide leader in the supply of steel rolling elements for wheel bearings, developed last year a non-conventional heat treatment process for 100Cr6 (SAE 52100) rolling element steel for improved fatigue performance. The results of wheel bearing rolling contact fatigue (RCF) tests showed the importance of rolling element dimensional stability. As retained austenite transformed to the martensite phase, rolling element volume increase occurred leading to fatigue failure. The fatigue life of rolling elements is directly proportional to their dimensional stability. As a result of the experimental tests, a project was initiated with the goal of increasing the dimensional stability of rolling elements thereby enhancing RCF performance. The use of another conventional steel alloy, not usually applied for automotive wheel bearing application, was the proposed solution. The goal of this new application package of rolling elements is to improve fatigue performance: in particular, sub-surface fatigue, as well as increased resistance to wear and stability at higher operating temperatures. A subsequent evolution of the project will be to develop a “non- standardized” alloy grade for greater rolling element dimensional stability resulting in an expected expansion of fatigue performance.
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