Surface Tolerancing of Gears in Electrified Drivelines (SURGE)

Purpose and goal:

The objective of this project was to investigate how gear surface requirements in drive trains are affected by the trend towards electrification of vehicles. How can manufacturers define, machine and control the required surface for increased gear performance? The project has touched on and highlighted some of the difficulties of setting limits for different gear applications where the surface is one of many critical areas.

Expected results and effects:

The result of this work gives an image of how the surface roughness is handled today and a state of the art of industry control measurements as well as what is said in literature regarding the effect of finer surfaces on gear performance in terms of efficiency, NVH and wear and gear life. Approach and implementation:

A literature study focusing on roughness measurements, parameters and equipments was made and a questionaire was sent out to industrial partners. The work also treats comparison between different gear finishing operations in literature and to some extent in practice and how the generated surface quality is affected by the choice of process and parameters within each process.

Three demonstrators were selected where surface analysis with different measurement techniques were made and compared.