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Title: Heat generation and transfer in automotive dry clutch engagement
Authors: Gkinis, Theofilos
Rahmani, Ramin
Rahnejat, Homer
O'Mahony, M.
Keywords: Automotive clutch
Thermal network model
Clutch lining temperature
Friction
Tribometry
Lining material properties
Issue Date: 2018
Publisher: © Zhejiang University and Springer-Verlag GmbH Germany
Citation: GKINIS, T. ...et al., 2018. Heat generation and transfer in automotive dry clutch engagement. Journal of Zhejiang University Science A, 19(3), pp. 175-188.
Abstract: Dynamic behaviour of automotive dry clutches depends on the frictional characteristics of the contact between the friction lining material, the flywheel and the pressure plate during the clutch engagement process. During engagement due to high interfacial slip and relatively high contact pressures, generated friction gives rise to contact heat, which affects the material behaviour and the associated frictional characteristics. In practice excess interfacial slipping and generated heat during torque transmission can result in wear of the lining, thermal distortion of the friction disc, and reduced useful life of the clutch. This paper provides measurement of friction lining characteristics for dry clutches for new and worn state under representative operating conditions pertaining to interfacial slipping during clutch engagement, applied contact pressures, and generated temperatures. An analytical thermal partitioning network model of the clutch assembly, incorporating the flywheel, friction lining, and the pressure plate is presented, based upon the principle of conservation of energy. The results of the analysis show a higher coefficient of friction for the new lining material which reduces the extent of interfacial slipping during clutch engagement, thus reducing the frictional power loss and generated interfacial heating. The generated heat is removed less efficiently from worn lining. This might be affected by different factors observed such as the reduced lining thickness and the reduction of density of the material but mainly because of poorer thermal conductivity due to the depletion of copper particles in its microstructure as the result of wear. The study integrates frictional characteristics, microstructural composition, mechanisms of heat generation, effect of lining wear and heat transfer in a fundamental manner, an approach not hitherto reported in literature.
Description: This paper is in closed access until 12 months after publication.
Version: Accepted version
DOI: 10.1631/jzus.A1700481
URI: https://dspace.lboro.ac.uk/2134/32160
Publisher Link: https://doi.org/10.1631/jzus.A1700481
ISSN: 1673-565X
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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