Analysis and design exploration of single stage compound stepped planetary gear transmissions

Christos Spitas, Amin Amani, Efstratios Tsolakis, Vasilios Spitas

Research output: Journal PublicationArticlepeer-review


High-ratio compound stepped planetary transmissions are typically characterised by poor overall efficiencies, even if the individual mesh efficiencies are high, because of the very high sliding velocities imposed by the kinematics of their topologies. Here, a parametric exploration of the design space is presented for a stepped transmission topology, which is assessed in terms of transmission ratio, efficiency, and power density. It is confirmed that high ratio per (compound) stage is accompanied by low mechanical efficiency and/or large volume for the most part of the parametric design space, as is also anticipated by prior research. At the same time, specific niche regions of particular importance are identified that combine high-ratio, high-efficiency, and good power density.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalInternational Journal of Powertrains
Issue number1-3
Publication statusPublished - 2018
Externally publishedYes


  • Efficiency
  • Planetary gears
  • Power density
  • Transmission ratio
  • Volume

ASJC Scopus subject areas

  • Automotive Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering


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