Optimization of the performance of involute splines by new surface treatments (CROSSONT)



01.01.2019 to 31.12.2020
Organizational Unit:
Chair of Machine Tools, Gear Technology
European Union EU

Starting Situation

The European Union's CleanSky 2 initiative aims to reduce CO2, NOx and noise emissions from aviation in order to improve the quality of life in Europe through environmental protection. At the same time, the competitiveness of the aviation industry in international competition must be strengthened in order to secure and create jobs. Therefore, the ACARE 2020 targets and the first steps towards the Flightpath 2050 targets will be facilitated, including a reduction of 75% of CO2 and 90% of NOx emissions and a 65% noise reduction. The overall objective of the CROSSONT project is to find new surface treatments and coatings that will make mating gears more resource efficient, e.g. increase their power density.

Research Objective

CROSSONT will contribute to these ambitious emission reduction targets by offering innovative approaches to material preparation to drive Ultra High Bypass Ratio (UHBR) technology. Ultra High Bypass Ratio technology has been identified as a promising approach to reducing aircraft emissions and fuel consumption. UHBR uses a reduction gear that reduces fan speed and allows larger fan diameters to be realized. The modelling of the spline is carried out to predict its behaviour. Using a combination of laser and physical vapour deposition (PVD) techniques, excellent surface properties can be achieved for mating gears in UHBR applications. The established laser hardening process is used, whereby micro- and nanostructured surfaces have to be taken into account, the application of which is becoming more and more important due to their properties.