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An improvement in gear tooth design methodology using finite element method
Date Issued
29-10-2007
Author(s)
Koilraj, M.
Muthuveerappan, G.
Pattabiraman, J.
Abstract
Some changes in the cross-section of the gear tooth increase the amount of localized stress leading to stress concentration. The magnitude of the stress concentration depends on the size and shape of the section. In particular, it depends on the radius of curvature of the fillet at the critical section of the gear tooth. The profile of a gear tooth consists of an involute shape at the sides and a trochoidal shape at the fillet. An analytical method is used to generate the above profiles. From the gear specification, the parameters required to generate the gear tooth profiles whose coordinates of the involute and trochoidal profiles are generated using different types of cutters for standard and corrected gears. In the present work, tooth fillet bending stresses have been calculated for both the standard and corrected gears considering the actual trochoidal fillet form, which closely represents the size and shape effects. The ratio of the stress determined by this method to the stress obtained from the modified Lewis equation has been considered as stress correction factor Kt. Stress correction factor is determined for a standard gear and validated with AGMA code through the comparison methods. The stress correction factor is determined by changing the parameters like number of teeth and correction factor for a standard and corrected gears and their respective influence on this factor (Kt) has been studied and analyzed in this work. From this study, the geometry factor (J) has also been derived for different conditions.
Volume
88