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Lubricated loaded tooth contact analysis and non-newtonian thermoelastohydrodynamics of high-performance spur gear transmission systems

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journal contribution
posted on 17.02.2020, 14:53 authored by Gajarajan Sivayogan, Ramin RahmaniRamin Rahmani, Homer Rahnejat
Energy efficiency and functional reliability are the two key requirements in the design of high-performance transmissions. Therefore, a representative analysis replicating real operating conditions is essential. This paper presents the thermoelastohydrodynamic lubrication (TEHL) of meshing spur gear teeth of high-performance racing transmission systems, where high generated contact pressures and lubricant shear lead to non-Newtonian traction. The determination of the input contact geometry of meshing pairs as well as contact kinematics are essential steps for representative TEHL. These are incorporated in the current analysis through the use of Lubricated Loaded Tooth Contact Analysis (LLTCA), which is far more realistic than the traditional Tooth Contact Analysis (TCA). In addition, the effects of lubricant and flash surface temperature rise of contacting pairs, leading to the thermal thinning of lubricant, are taken into account using a thermal network model. Furthermore, high-speed contact kinematics lead to shear thinning of the lubricant and reduce the film thickness under non-Newtonian traction. This comprehensive approach based on established TEHL analysis, particularly including the effect of LLTCA on the TEHL of spur gears, has not hitherto been reported in literature.

Funding

Engineering and Physical Sciences Research Council (EPSRC) extended to this research under the Centre for Doctoral Training for Embedded Intelligence (CDT-EI) and AVL List GmbH, grant reference: EP/L014998/1

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Lubricants

Volume

8

Issue

2

Publisher

MDPI AG

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by MDPI under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

11/02/2020

Publication date

2020-02-14

Copyright date

2020

ISSN

2075-4442

eISSN

2075-4442

Language

en

Depositor

Dr Ramin Rahmani Deposit date: 14 February 2020

Article number

20