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Title: Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles
Authors: Dolatabadi, Nader
Rahmani, Ramin
Theodossiades, Stephanos
Rahnejat, Homer
Blundell, Guy
Bernard, Guillaume
Keywords: Multi-disc clutch system
Multi-scale tribo-multi-body dynamic analysis
Clutch interfacial frictional characteristics, tribometry
Heavy duty off-highway vehicles
Issue Date: 2018
Publisher: © The authors. Published by SAGE Publications Ltd
Citation: DOLATABADI, N. ...et al., 2018. Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, In Press.
Abstract: Engine downsizing is desired for modern heavy-duty vehicles to enhance fuel economy and reduce emissions. However, the smaller engines usually cannot overcome the parasitic loads during engine start-up. A new clutch system is designed to disconnect the downsized engine from the parasitic losses prior to the idling speed. A multi-scale, multi-physics model is developed to study the clutch system. Multi-body dynamics is used to study the combined translational–rotational motions of the clutch components. A micro-scale contact model is incorporated to represent the frictional characteristics of the sliding surfaces. Although the clutch is designed for dry contact operation, leakage of actuating hydraulic fluid can affect the interfacial frictional characteristics. These are integrated into the multi-body dynamic analysis through tribometric studies of partially wetted surfaces using fresh and shear-degraded lubricants. Multi-scale simulations include sensitivity analysis of key operating parameters, such as contact pressure. This multi-physics approach is not hitherto reported in the literature. The study shows the importance of adhesion in dry clutch engagement, enabling full torque capacity. The same is also noted for any leakage of significantly shear-degraded lubricant into the clutch interfaces. However, the ingression of fresh lubricant into the contact is found to reduce the clutch torque capacity.
Description: This is an Open Access Article. It is published by Sage 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/
Sponsor: This work received financial support from InnovateUK (TSB, grant number 102249) and Caterpillar.
Version: Published
DOI: 10.1177/0954407018756789
URI: https://dspace.lboro.ac.uk/2134/32161
Publisher Link: https://doi.org/10.1177/0954407018756789
ISSN: 0954-4070
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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