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Title: Transient mixed thermo-elastohydrodynamic lubrication in multi-speed transmissions
Authors: De la Cruz, Miguel
Chong, W.W.F.
Teodorescu, M.
Theodossiades, Stephanos
Rahnejat, Homer
Keywords: Multi-speed transmissions
Mixed thermo-elastohydrodynamics
Loose gear rattle
Issue Date: 2012
Publisher: © Elsevier
Citation: DE LA CRUZ, M. ... et al, 2012. Transient mixed thermo-elastohydrodynamic lubrication in multi-speed transmissions. Tribology International, 49, pp.17-29.
Abstract: Noise, vibration and harshness (NVH) refinement as well as thermo‐mechanical efficiency are the key design attributes of modern compact multi‐speed transmissions. Therefore, unlike simple gear pair models, a full transmission model is required for a simultaneous study. The prominent NVH concern is transmission rattle, dominated by the intermittent unintended meshing of several lightly loaded unselected loose gear pairs arising from the system compactness. These gear pairs are subject to hydrodynamic impacts. The thermo‐mechanical efficiency is dominated by the engaged gears, with simultaneous meshing of teeth pairs subject to thermo‐elastohydrodynamic regime of lubrication, with often quite thin films, promoting asperity interactions. Therefore, a full transmission model is presented, comprising system dynamics, lubricated contacts, asperity interactions and thermal balance. Generic multi‐physics models of this type are a prerequisite for in‐depth analysis of transmission efficiency and operational refinement. Hitherto, such an approach has not been reported in literature.
Description: NOTICE: this is the author’s version of a work that was accepted for publication in Tribology International. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published at: http://dx.doi.org/10.1016/j.triboint.2011.12.006
Version: Accepted for publication
DOI: 10.1016/j.triboint.2011.12.006
URI: https://dspace.lboro.ac.uk/2134/13274
Publisher Link: http://dx.doi.org/10.1016/j.triboint.2011.12.006
ISSN: 0301-679X
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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