Frictional loss, load variation, viscosity and speed are major causes of power loss in helical gears under normal operating conditions. The study presents the major theoretical findings to predict the possible power loss in a helical gear box. First, an analytical technique was employed to model the frictional loss and coefficient of friction resulting from the heat generated for a pair of helical gear in mesh. Then, a finite element method and Comsol Multiphysics was applied to model the helical gear structure as well as the surface displacements under static and moving conditions of the pinion. It was observed that the highest amplitude in surface displacement was 14 ×1
