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Effect of bearing thermally induced preload on the efficiency of automotive manual transmission under RDE

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journal contribution
posted on 02.09.2019, 13:32 by Angela Laderou, Mahdi Mohammad-PourMahdi Mohammad-Pour, Stephanos TheodossiadesStephanos Theodossiades, Adam Wilson, Richard Daubney
In order to calculate the efficiency of an automotive manual transmission, taking into consideration the effect of its most power consuming components - gears and bearings - as well as the interactions between them, is of high importance. In this paper, a dynamic model has been developed which can predict the frictional losses of a complete gearbox as a system and, thus, its efficiency. The effect of temperature on bearing preload is also considered and taken into account from a system perspective identifying its effect on the bearings frictional losses (as well as the overall efficiency). The operating conditions used are snapshots of the RDE (Real Driving Emissions) driving cycle, which is a standard metric for automotive manufactures. Results show that doubling the temperature can lead to 120% increase of the bearing losses and up to 140% increase of the total transmission losses. The effect of the variation of operating conditions (velocity and torque) is also taken into account.
The novelty of this paper lays in the development of a dynamic model which takes into account the performance of a complete gearbox under transient operating conditions, as well as the interaction among its main components and the ability to make changes on the influencing factors of transmission efficiency so that their effect on the complete gearbox efficiency can be tracked. This has not been yet reported in the relevant literature which mainly focuses on the influencing factors of transmission power loss and efficiency experimental measurements under various operating conditions for gear pairs instead of complete gearboxes.

Funding

Ford Motor Company

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science

Volume

233

Issue

21-22

Pages

7423-7441

Publisher

SAGE Publications

Version

AM (Accepted Manuscript)

Rights holder

© IMechE

Publisher statement

A. Laderou, M. Mohammadpour, S. Theodossiades, A. Wilson and R. Daubney, Effect of bearing thermally induced preload on the efficiency of automotive manual transmission under RDE , Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science (233: 21-22) pp. 7423-7441. Copyright © 2019 (IMechE). DOI: 10.1177/0954406219877905. Users who receive access to an article through a repository are reminded that the article is protected by copyright and reuse is restricted to non-commercial and no derivative uses. Users may also download and save a local copy of an article accessed in an institutional repository for the user's personal reference.

Acceptance date

31/08/2019

Publication date

2019-09-18

Copyright date

2019

ISSN

0954-4062

eISSN

2041-2983

Language

en

Depositor

Dr Mahdi Mohammad Pour