Influence of gear–shaft interference fit assembly on the meshing characteristics of cylindrical gears considering comprehensive modifications

Abstract

The interference fit assembly of shaft and gear has an important influence on the gear drive performance. In this work, the cylindrical gear active surfaces and fillet will be provided with comprehensive modifications including front and back end reliefs, tip and root reliefs, as well as a low-value lead crowning. The mathematical model of the gear flanks surfaces with the mentioned modifications has been developed. A finite element model of the gear set has been established to study the effect of the interference fit assembly of the gears with their shafts on the meshing characteristics of cylindrical gears with modified tooth surfaces. With the increment of the interference fit amount, the contact pattern is shifted towards the top edge of the gear flank. The increment of the interference fit amount also contributes to the shift of root stress distribution towards the root land of the tooth. The maximum value of root bending stress keeps a positive linear relationship with the amount of shaft–gear interference fit being considered.