Study on the design method of interference fit between gear and shaft of automobile transmission

Abstract

The interference fit of gear and shaft in automobile transmission has an important influence on the performance of gear transmission. In order to design reasonably and calculate accurately, the theoretical calculation model of the interference fit between gear and shaft is established according to the principles of elastic-plastic mechanics. A new method of calculating the amount of interference is designed based on the Lame equation. Three limiting conditions are taken in the calculation. They are load transfer capacity of gear, no plastic deformation of fitting surface and control of gear tooth deformation. The theoretical calculation and finite element simulation analysis are carried out in an application case. The results of calculation and analysis show that the interference fit of gear and shaft has an important influence on the gear tooth deformation. The amount of interference calculation method in this paper can reduce the deformation of gear tooth and make the gear have higher accuracy.