Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions

Improved fuel efficiency and reduced emissions are key drivers for modern drivetrain systems. Therefore, in recent years, dry sumps with air-oil mist lubrication have been used for efficient transmission design in order to reduce the churning losses. With dry sumps appropriate cooling measures shoul...

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Main Authors:	Ehsan Fatourehchi, Hamed Shahmohamadi, Mahdi Mohammadpour, Ramin Rahmani, Stephanos Theodossiades, Homer Rahnejat
Format:	Default Article
Published:	2018
Subjects:	Mechanical engineering not elsewhere classified Dry sump transmission Thermo-elastohydrodynamics Heat transfer Oil jet Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/28373
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id	rr-article-9564437
record_format	Figshare
spelling	rr-article-95644372018-04-26T00:00:00Z Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions Ehsan Fatourehchi (1257477) Hamed Shahmohamadi (7129070) Mahdi Mohammadpour (7204604) Ramin Rahmani (1250418) Stephanos Theodossiades (1247457) Homer Rahnejat (1247550) Mechanical engineering not elsewhere classified Dry sump transmission Thermo-elastohydrodynamics Heat transfer Oil jet Mechanical Engineering not elsewhere classified Improved fuel efficiency and reduced emissions are key drivers for modern drivetrain systems. Therefore, in recent years, dry sumps with air-oil mist lubrication have been used for efficient transmission design in order to reduce the churning losses. With dry sumps appropriate cooling measures should be implemented to dissipate the generated contact heat in an efficient manner. This paper integrates a tribological model with three dimensional thermofluid analysis in order to predict the heat generated in the lubricated meshing gear contacts and its dissipation rate by an impinging oil jet in air-oil mist environment. Such an approach has not hitherto been reported in literature. The results show that the generated heat under realistic conditions cannot be entirely dissipated by the impinging oil jet in the air-oil mist transmission casing. Numerical results are used to derive extrapolated regressed equations for heat transfer purposes for time-efficient analysis. These conform well with the detailed numerical results. 2018-04-26T00:00:00Z Text Journal contribution 2134/28373 https://figshare.com/articles/journal_contribution/Thermal_analysis_of_an_oil_jet-dry_sump_transmission_gear_under_mixed-elastohydrodynamic_conditions/9564437 CC BY 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified Dry sump transmission Thermo-elastohydrodynamics Heat transfer Oil jet Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified Dry sump transmission Thermo-elastohydrodynamics Heat transfer Oil jet Mechanical Engineering not elsewhere classified Ehsan Fatourehchi Hamed Shahmohamadi Mahdi Mohammadpour Ramin Rahmani Stephanos Theodossiades Homer Rahnejat Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions
description	Improved fuel efficiency and reduced emissions are key drivers for modern drivetrain systems. Therefore, in recent years, dry sumps with air-oil mist lubrication have been used for efficient transmission design in order to reduce the churning losses. With dry sumps appropriate cooling measures should be implemented to dissipate the generated contact heat in an efficient manner. This paper integrates a tribological model with three dimensional thermofluid analysis in order to predict the heat generated in the lubricated meshing gear contacts and its dissipation rate by an impinging oil jet in air-oil mist environment. Such an approach has not hitherto been reported in literature. The results show that the generated heat under realistic conditions cannot be entirely dissipated by the impinging oil jet in the air-oil mist transmission casing. Numerical results are used to derive extrapolated regressed equations for heat transfer purposes for time-efficient analysis. These conform well with the detailed numerical results.
format	Default Article
author	Ehsan Fatourehchi Hamed Shahmohamadi Mahdi Mohammadpour Ramin Rahmani Stephanos Theodossiades Homer Rahnejat
author_facet	Ehsan Fatourehchi Hamed Shahmohamadi Mahdi Mohammadpour Ramin Rahmani Stephanos Theodossiades Homer Rahnejat
author_sort	Ehsan Fatourehchi (1257477)
title	Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions
title_short	Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions
title_full	Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions
title_fullStr	Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions
title_full_unstemmed	Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions
title_sort	thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions
publishDate	2018
url	https://hdl.handle.net/2134/28373
_version_	1797731374974631936

Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions

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