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Hydrodynamic lubricant film separation during co-directional and counter-directional rotations of disengaged wet clutch packs

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journal contribution
posted on 06.08.2019, 08:39 by Nick Morris, Rishi Patel, Homer Rahnejat
The parasitic drag losses incurred by wet clutches, used in transmission systems, can significantly affect vehicular powertrain efficiency. This paper presents a novel implicit solution for hydrodynamic parasitic drag losses of disengaged clutches. These are generated by conjunctional friction, taking into account lubricant film separation during co-directional and counter-directional disc pair rotations. Lubricant film rupture is considered through application of incipient reverse flow boundary condition, which is representative of lubricant film separation. The results point to the operating conditions at which significant power losses occur. In particular, the time efficient model is able to represent the small losses incurred during co-directional rotation of disc pairs.

Funding

J.C. Bamford Excavators and Innovate UK.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Fluids Engineering

Volume

142

Issue

1

Publisher

American Society of Mechanical Engineers

Version

AM (Accepted Manuscript)

Rights holder

© ASME

Acceptance date

25/07/2019

Publication date

2019-10-04

Copyright date

2020

ISSN

0098-2202

eISSN

1528-901X

Language

en

Article number

011104

Licence

Exports