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

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journal contribution
posted on 05.02.2018 by Ehsan Fatourehchi, Hamed Shahmohamadi, Mahdi Mohammadpour, Ramin Rahmani, Stephanos Theodossiades, Homer Rahnejat
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.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Tribology

Volume

140

Issue

5

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.

Publisher

© ASME (American Society of Mechanical Engineers)

Version

AM (Accepted Manuscript)

Acceptance date

26/01/2018

Publication date

2018-04-26

Notes

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.

ISSN

0742-4787

eISSN

1528-8897

Language

en

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