Gear Root Bending Stress Reduction by Employing Dual Asymmetry - Asymmetry in Tooth Profile Shape and Root Fillet Form

摘要

Conventional gear designs produce symmetrical involute and symmetrical fillet forms on both drive and coast sides of the tooth. Asymmetry in involute form has been studied by researchers to increase tooth root thickness and hence to reduce the root bending stress. Similarly, asymmetry in fillet form has also been recently studied with resulting 10% reduction in bending stress of conventional 20degree symmetric tooth gears. In this paper, asymmetry both in involute and root fillet forms are employed together to further investigate any likely reduction in bending stress. Results for different levels of asymmetry in both tooth form (pressure angles) of drive and coast sides and also for different levels of cutter tip radii coefficients of drive and coast sides produced bending stress reductions between 9-15%.