Stress Analysis of Spur Gears in Consideration of the Ratio of Contact

This paper shows a new method for calculating the load distribution ratios and stress in spur gears by using the finite element models with many gear teeth. The results about the ratios of load taken by meshing gear tooth to the full load and the stress distribution show a noticeable difference between the analysis assuming that the load is shared between 2 pairs of teeth and the one assuming that it is carried by a single pair of teeth. This method makes it possible to clarify the effects of the ratio of contact and the addendum modification coefficience upon the load distribution ratio, stress distribution in gears and the stress concentration in the fillet at the base of the tooth.