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

Authors: Christos Spitas; Amin Amani; Efstratios Tsolakis; Vasilios Spitas

Addresses: School of Engineering, Nazarbayev University, Astana, Kazakhstan; Ageing Centre, Delft University of Technology, Delft, Netherlands ' Psyche Engineering Systems and Technologies BV, Koningin Julianaplein 10, Den Haag, Netherlands ' Psyche Engineering Systems and Technologies BV, Koningin Julianaplein 10, Den Haag, Netherlands; School of Mechanical Engineering, National Technical University of Athens, Athens, Greece ' School of Mechanical Engineering, National Technical University of Athens, Athens, Greece

Abstract: 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.

Keywords: planetary gears; efficiency; volume; transmission ratio; power density.

DOI: 10.1504/IJPT.2018.090353

International Journal of Powertrains, 2018 Vol.7 No.1/2/3, pp.1 - 14

Available online: 01 Mar 2018 *

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