EXPERIMANTAL VALIDATION OF THE NEW THEORETICAL MODEL OF INTERFERENCE FITS

Simion HARAGÂȘ, Ovidiu BUIGA, Lucian TUDOSE

Abstract


Bearings are, in general, mounted with an interference fit on the shaft or in the housing. During the pressing phase, expansion/compression of the bearing rings and the mating assembly parts occur, influencing the operating bearing clearance. This paper refers to a new theoretical model which was developed for the exact calculation of the dimensionless coefficient - Kie and also for the radial displacements (suffered by the hub and shaft during the pressing phase) used in the case of an interference-fitted fastener to achieve the desired operational clearance. To validate the new mathematical model an experimental analysis of the interference-fit was carried out. In this vein, two sets of experimental specimens were produced. The first set has the shaft and the hub made of quenched and tempered - 41CrMo4 alloy steel and C45 respectively; for the 2nd set, the shaft is made of C45 and the hub is from X6CrNiTi18-10. It could be observed that the results from the two approaches i.e. theoretical and experimental were consistent and in relatively good agreement.

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References


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