Transient mixed thermo-elastohydrodynamic lubrication in multi-speed transmissions
Transient mixed thermo-elastohydrodynamic lubrication in multi-speed transmissions
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.
multi-speed transmissions, mixed thermo-elastohydrodynamics, loose gear rattle
17-29
De la Cruz, M.
53f3094b-239b-4d76-b233-2636c8754072
Chong, W.W.F.
bd35fdf8-fa6d-4330-8bac-ae20cc8fc58e
Teodorescu, M.
10e22073-39f7-41c3-b2b7-2886c2d976f6
Theodossiades, S.
fa950f6d-8850-49eb-a608-30d616a0b394
Rahnejat, H.
f5b9b13a-dc42-4fde-a98d-4e0c48bb19ab
May 2012
De la Cruz, M.
53f3094b-239b-4d76-b233-2636c8754072
Chong, W.W.F.
bd35fdf8-fa6d-4330-8bac-ae20cc8fc58e
Teodorescu, M.
10e22073-39f7-41c3-b2b7-2886c2d976f6
Theodossiades, S.
fa950f6d-8850-49eb-a608-30d616a0b394
Rahnejat, H.
f5b9b13a-dc42-4fde-a98d-4e0c48bb19ab
De la Cruz, M., Chong, W.W.F., Teodorescu, M., Theodossiades, S. and Rahnejat, H.
(2012)
Transient mixed thermo-elastohydrodynamic lubrication in multi-speed transmissions.
Tribology International, 49, .
(doi:10.1016/j.triboint.2011.12.006).
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.
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Published date: May 2012
Keywords:
multi-speed transmissions, mixed thermo-elastohydrodynamics, loose gear rattle
Organisations:
nCATS Group
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Local EPrints ID: 353120
URI: http://eprints.soton.ac.uk/id/eprint/353120
ISSN: 0301-679X
PURE UUID: 03f0c12c-7d3a-42b5-9445-d19cce2546af
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Date deposited: 03 Jun 2013 08:57
Last modified: 14 Mar 2024 14:01
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Author:
M. De la Cruz
Author:
W.W.F. Chong
Author:
M. Teodorescu
Author:
S. Theodossiades
Author:
H. Rahnejat
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