Reducing scrapping of gears by assessment of tip contact threshold torque

Research output: Contribution to journalArticlepeer-review


While striving for more competitive products as well as reaching the Global Sustainable Development Goals, automotive powertrain manufacturers increase the demands on gears, which translates to decreased manufacturing error tolerances. Too tight tolerances may, however, counteract the goal if it leads to increased material and energy consumption due to unjustified scrapping. This paper presents a method to prevent unjustified scrapping by comparing the severity of different manufacturing error tolerances by means of the tip contact threshold torque. Curve fits are shown to be accurate and helpful to assess the outcome of a produced batch of gears. A case study is made where the method is used with measured data from the industry. It can be concluded from the investigation that considerable amounts of scrapping can be avoided by consideration of the threshold torque.

Original languageEnglish
Pages (from-to)1613-1622
JournalProceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
Issue number8
Early online date2021
Publication statusPublished - 2022

Subject classification (UKÄ)

  • Tribology
  • Vehicle Engineering

Free keywords

  • LTCA
  • pitch error
  • profile slope error
  • Scrapping
  • threshold torque
  • tip contact
  • tolerance


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