High efficiency, reduced fuel consumption and decreased noise and COemissions can be achieved by the ultra-high-bypass ratio (UHBP) geared turbofan engine. The UHBP turbofan uses a planetary gear stage to decouple the fan RPM from the RPM of the turbine. However, moving parts generate friction and heat and therefore require lubrication systems. In-flight loss of lubrication could potentially lead to catastrophic damage.

The goal of LUBGEAR is to combine

  • optimized gear geometry to provide low power loss conditions
  • surface and material combinations providing low friction and surface treatment which can withstand off-design conditions 

This new gear design can withstand off-design conditions without additional means such as secondary or auxiliary lubrication system through reduced friction losses and frictional heat.

This developed technology will advance over TRL 2 over Simulations and experiments at contact level up to TRL 3 through validation in an experimental component test rig.

Key findings:

  • Gear coatings offered the highest increase in gear lifetime under loss of lubrication,
  • Nitriding increased performance compared to carburizing,
  • Superfinishing might have negative impact on LOL performance.

ADTs role in LUBGEAR:

  • Elaboration of manufacturing plans and specification
  • Analysis of results related to the manufacturing of gears
  • Evaluation of results related to manufacturing, aviation operation and certification
  • Overview of potential uses of project results, risk assessment, identification of market barriers and contact with potential users
  • Dissemination activities (workshops, conference presentations)

LUBGEARs consortium consist of five strategic industrial and university partners who bring together their expertise in engineering, tribology, mechanics, and advanced chemistry.


Contact: Lorenz Braumann

Funded by:
Clean Sky 2 (Horizon 2020 – European Union funding for Research and Innovation

Project period: 01.01.2021 – 31.10.2023

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