Proposal for Tip Relief Modification to reduce Noise in Spur Gears and sensitivity to meshing conditions

In the paper a new Tip Relief Profile Modification for spur Gears is presented. The topography here proposed is a classical linear profile modification with a parabolic fillet (Linear- Parabolic modification). The parabolic fillet extension is treated as a parameter and its effect investigated. The proposed topography is able to take advantages from both Linear, and Parabolic tip relief. The evolution from Linear to Parabolic is discussed in terms of Peak to Peak Transmission Error. Anomalous contact conditions due to particular tip relief modification are reported, and maps are obtained in order to find optimum tip relief by taking into account contact conditions boundaries too.