Stress Analysis of Internal Gear Pairs with Unequal Tooth Thickness

This study aims to increase load carrying capacity of internal spur gear mechanism with making stress balance between pinion and internal gear thanks to changing standard thickness on pitch circle. As standard, this thickness value is half of pitch. Actually, it could be changed provided that total pitch value is constant. To evaluate effect of tooth thickness change on stress, finite element analyses were conducted. As an expected result with increasing thickness on pitch circle, the stress decreases. Specific thickness values which make maximum stress equal was determined. Besides, the total mechanism weight was reduced with this design change.