Tribo-Dynamic Analysis of High-Speed Roller Bearings for Electrified Vehicle Powertrains

H. Questa*, M. Mohammadpour, S. Theodossiades, C. P. Garner, S. R. Bewsher, Günter Offner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Roller bearings are critical components in electrified powertrains. At high speeds, the critical role of the elastohydrodynamic lubrication (EHL) cannot be ignored, necessitating a tribo-dynamic analysis. This paper investigates the behaviour of roller bearings under operating conditions present in high-speed electrified powertrains. The bearing motion is obtained experimentally using a novel experimental rig. The bearing centre's orbital motion is acquired from the experiment and used as the boundary condition for tribological analysis. Results reveal that the EHL film thickness increases from 0.2 to 1.9 μm across a speed range of 0–15 000 rpm. A comparison with conventional dry contact analysis shows that roller load can be underestimated if the lubricant film is neglected in the roller-race contact deformation.
Original languageEnglish
Article number106675
JournalTribology International
Publication statusPublished - Feb 2021
Externally publishedYes


  • Dynamics
  • Efficiency
  • EHL
  • Electrified powertrain
  • Roller bearings

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces


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