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Title: Efficiency and durability predictions of high performance racing transmissions
Authors: Fatourehchi, Ehsan
Elisaus, Vishak
Mohammadpour, Mahdi
Theodossiades, Stephanos
Rahnejat, Homer
Issue Date: 2016
Publisher: © SAE International
Citation: FATOUREHCHI, E. ...et al., 2016. Efficiency and durability predictions of high performance racing transmissions. SAE International Journal of Passenger Cars - Mechanical Systems, 9(3):1117-1124.
Abstract: Efficiency and durability are key areas of research and development in modern racing drivetrains. Stringent regulations necessitate the need for components capable of operating under highly loaded conditions whilst being efficient and reliable. Downsizing, increasing the power- to-weight ratio and modification of gear teeth geometry to reduce friction are some of the actions undertaken to achieve these objectives. These approaches can however result in reduced structural integrity and component durability. Achieving a balance between system reliability and optimal efficiency requires detailed integrated multi-disciplinary analyses, with the consideration of system dynamics, contact mechanics/tribology and stress analysis/structural integrity. This paper presents an analytical model to predict quasi-static contact power losses in lubricated spur gear sets operating under the Elastohydrodynamic regime of lubrication. Tooth Contact Analysis (TCA) is used to predict variations in contact loads, local surface curvature and rolling and sliding velocities. This is combined with an extrapolated oil film thickness formula available in literature, to predict instantaneous lubricant film thickness and sub-surface stresses. Subsequently, viscous and boundary friction are estimated, enabling calculation of power losses. The presented methodology has been used to investigate the effects of parabolic tip relief on power loss and induced sub-surface stresses. The results of this investigation are also presented.
Description: This paper was accepted for publication in the journal SAE International Journal of Passenger Cars - Mechanical Systems and the definitive published version is available at http://dx.doi.org/10.4271/2016-01-1852 Presented at the 9th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference, Graz, Austria, June 22-24, 2016.
Version: Accepted for publication
DOI: 10.4271/2016-01-1852
URI: https://dspace.lboro.ac.uk/2134/20793
Publisher Link: http://dx.doi.org/10.4271/2016-01-1852
ISSN: 1946-4002
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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