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This paper focuses on experimental and numerical investigations on preload drop of rear axles differential side bearings which occur during tube to carrier pressing operation on the assembly line. The phenomena behind preload decrease during tube fitting operation is revealed via CAE iterations and verified with on site measurement data using strain gauged bearings. It is proven that the level of preload drop during tube pressing operation depends on tube to carrier fitting interference.

This paper represents identification and elimination of differential side bearing failures of a medium duty cycle vehicle. Using instrumented bearings, it is demonstrated that the variation in preload drop during tube pressing operation depends on tube to carrier fitting tolerances. The variability in bearing preload drop is identified and CAE analysis revealing the phenomena behind this issue is conducted. Implementation and verification of corrective actions are also covered within this paper.