Wear of gear flanks is an observed and always present phenomenon in gearboxes. Thus, analysis of stresses has become popular as an part of research on gears to reduce he failures and for best possible design of gears. The bending and Surface stresses of the gear tooth are main causes for the failure of the gear.
Gears generally fail when the tooth stress exceeds the maximum stress.
Gears are one of the most important parts in mechanical power transmission system.