On optimization of interference fit assembly
Assembly of shaft and hub by an interference fit is a classical connection with known advantages and disadvantages. The advantage being the level of possible torque transfer while the disadvantage is a possible fretting fatigue failure at the points of stress concentration. To improve the assembly the present paper discusses different optimized designs that improve the contact pressure distribution. The pressure distribution in the contact is the source responsible for the fatigue failure. The distribution can be improved by design modification done directly on the contacting surfaces which however requires a very high production precision. Alternatively it is shown, how hub side shape optimization can improve the pressure distribution significantly. The latter design change has no influence on the remaining shaft-hub design i.e. the attachment of other parts. The analysis is performed either by a traditional contact analysis, or by a super element contact analysis where no iterations are needed for the contact evaluation.
KeywordsInterference fit Contact Shape optimization Stress concentration FE
For discussions and suggestions I wish to thank Prof. Peder Klit and Prof. Pauli Pedersen.
- COMSOL AB (1998-2009) Stockholm, www.comsol.se
- Fujiwara H, Kawase T (2007) Logarithmic profiles of rollers in roller bearings and optimization of the profiles (reprint from the original paper (in Japanese) carried in the proceedings of the Japan society of mechanical engineers part c, vol 72 (2006),3022-2029). NTN Tech Rev 70:140–148Google Scholar
- Reusner H (1987) The logarithmic roller profile—the key to superior performance of cylindrical and taper roller bearings. Ball Bearing Journal 230:2–10Google Scholar