Finite Element Analysis of Contact and Bending Stresses in Pair of Helical Gear

In gear design, excessive tooth contact stresses and bending stresses are one of the prime gear failure factors; therefore, its analysis is very important in order to shorten the possibility of gear tooth failure. In the present work, an attempt is made to find the tooth bending stresses and contact stresses in a helical gear pair are calculated by using AGMA theory and finite element analysis (FEA) method. The modeling of helical gear pair is carried out in CREO and ANSYS is used for FEA. The stress analysis of the helical gear pair is done by using AGMA theory considering different helix angles and different pressure angles. Here taking annealed AISI 9310 material for pinion and annealed AISI 8620 material for gear. It is observed that the bending stresses and contact stresses, both decreases with an increase in the helix angle if the pressure angle remains constant. However, the error in the calculation by AGMA and FEA is higher for the bending stresses than the contact stresses. During analysis, it’s found that validation b/w AGMA and FEA for contact stresses is about 0.74% and for bending stresses 1.67% for bending stresses.