Efficiency and durability predictions of high performance racing transmissions

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 m...

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Main Authors:	Ehsan Fatourehchi, Vishak Elisaus, Mahdi Mohammadpour, Stephanos Theodossiades, Homer Rahnejat
Format:	Default Conference proceeding
Published:	2016
Subjects:	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/20793
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id	rr-article-9565514
record_format	Figshare
spelling	rr-article-95655142016-01-01T00:00:00Z Efficiency and durability predictions of high performance racing transmissions Ehsan Fatourehchi (1257477) Vishak Elisaus (1258176) Mahdi Mohammadpour (7204604) Stephanos Theodossiades (1247457) Homer Rahnejat (1247550) Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified 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. 2016-01-01T00:00:00Z Text Conference contribution 2134/20793 https://figshare.com/articles/conference_contribution/Efficiency_and_durability_predictions_of_high_performance_racing_transmissions/9565514 CC BY-NC-ND 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified Ehsan Fatourehchi Vishak Elisaus Mahdi Mohammadpour Stephanos Theodossiades Homer Rahnejat Efficiency and durability predictions of high performance racing transmissions
description	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.
format	Default Conference proceeding
author	Ehsan Fatourehchi Vishak Elisaus Mahdi Mohammadpour Stephanos Theodossiades Homer Rahnejat
author_facet	Ehsan Fatourehchi Vishak Elisaus Mahdi Mohammadpour Stephanos Theodossiades Homer Rahnejat
author_sort	Ehsan Fatourehchi (1257477)
title	Efficiency and durability predictions of high performance racing transmissions
title_short	Efficiency and durability predictions of high performance racing transmissions
title_full	Efficiency and durability predictions of high performance racing transmissions
title_fullStr	Efficiency and durability predictions of high performance racing transmissions
title_full_unstemmed	Efficiency and durability predictions of high performance racing transmissions
title_sort	efficiency and durability predictions of high performance racing transmissions
publishDate	2016
url	https://hdl.handle.net/2134/20793
_version_	1797736651715248128

Efficiency and durability predictions of high performance racing transmissions

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