Stress Analysis and Optimization of Gear Teeth

The operational performance of gears regarding smoothness, quietness, wear and life span is largely affected by how gear and pinion teeth make contact. And the geometric characteristic of teeth profile plays a very important role in influencing contact condition during gear transmission. For a nominal involute gear pairs, load concentration on the conjugated teeth would be generated inevitably under the deflection and inclination of gear pairs arising from topological modification of teeth, manufacturing errors, shaft misalignments and elastic deflections of the conjugated teeth and support of structure of the gear pair when it is under load. In this paper, a kind of modification of teeth profile, crowned teeth, is presented and analyzed by using ANASYS. This work was directed towards investigating the inherent characteristics of drum-shaped size and stress on the conjugated teeth. Analytic results are presented to demonstrate the better performance of crown gear under heavy load in gear transmission and the relationship between drum-shaped size design and load.