Can non-standard involute gears of different modules mesh?

C. Spitas, V. Spitas

Research output: Journal PublicationArticlepeer-review

16 Citations (Scopus)


Under the current standardized involute gear systems, meshing of gears of different modules is a practical impossibility. However, by performing a fresh reinterpretation of the well-established fundamental meshing principles, a more insightful form for the compatibility equations that govern involute gear tooth generation and meshing can be obtained. This article reports some first non-standard designs based on this analysis that allows gears of different modules to mesh. By the same token, standard gears can be manufactured with non-standard hobs and vice versa. Initial investigation suggests that practical benefits such as increasing the root bending strength without affecting the pitting resistance and the sliding velocity can be achieved that may justify such deviation from standard designs.

Original languageEnglish
Pages (from-to)1305-1313
Number of pages9
JournalProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
Issue number8
Publication statusPublished - Aug 2006
Externally publishedYes


  • Compatibility equations
  • Gear generation
  • Gear meshing
  • Interchangeability
  • Involute
  • Non-standard rack
  • Tooth stiffness
  • Tooth-bending strength

ASJC Scopus subject areas

  • Mechanical Engineering


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