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Title: Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions
Authors: Fatourehchi, Ehsan
Shahmohamadi, Hamed
Mohammadpour, Mahdi
Rahmani, Ramin
Theodossiades, Stephanos
Rahnejat, Homer
Keywords: Dry sump transmission
Heat transfer
Oil jet
Issue Date: 2018
Publisher: © ASME (American Society of Mechanical Engineers)
Citation: FATOUREHCHI, E. ... et al, 2018. Thermal analysis of an oil jet-dry sump transmission gear under mixed-elastohydrodynamic conditions. Journal of Tribology, 140 (5), 051502.
Abstract: 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.
Description: This paper was accepted for publication in the journal Journal of Tribology and the definitive published version is available at https://doi.org/10.1115/1.4039567.
Version: Accepted for publication
DOI: 10.1115/1.4039567
URI: https://dspace.lboro.ac.uk/2134/28373
Publisher Link: https://doi.org/10.1115/1.4039567
ISSN: 0742-4787
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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