Root stresses of thin-rimmed spur gears due to press-fitting.

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This paper presents a study on the root stresses of thin-rimmed spur gears due to press-fitting. The stress analysis of the thin-rimmed spur gear press-fitted upon the shaft or the bush by the 2-dimensional finite element method (FEM), in which the elastic contact between the thin-rimmed gear and the shaft or the bush, was taken into consideration, was carried out, and the root stresses were measured. The effects of rim and bush thicknesses, number of teeth, and interference on the root stress and the stresses at the contacting surface were examined. On the basis of these calculated results, a practical formula for the maximum true root stress of thin-rimmed spur gear press-fitted upon the shaft was derived.