In a previous paper (Changenet, and Velex, 2007, “A Model for the Prediction of Churning Losses in Geared Transmissions—Preliminary Results,” ASME J. Mech. Des., 129(1), pp. 128–133), a series of empirical formulas were presented enabling accurate predictions of churning losses for one gear, which is typical of automotive transmission geometry. However, this formulation does not take into account the influence of flanges and deflectors. In order to extend the proposed methodology, a test rig has been set up in which several movable walls can be inserted, thus making it possible to modify the radial and axial clearances, i.e., the distances between the tested gear and the walls. Based on a qualitative evaluation of the various fluid flow regimes possible in gearboxes, the influence of the global volume of the oil sump on churning losses is analyzed. By considering a number of flange and deflector arrangements, the following conclusions are drawn: (a) Radial clearances have a weaker influence than axial clearances and (b) power losses can be minimized by properly chosen axial clearances.
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e-mail: philippe.velex@insa-lyon.fr
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June 2008
Research Papers
Housing Influence on Churning Losses in Geared Transmissions
C. Changenet,
C. Changenet
Mechanical Engineering Department,
ECAM
, Lyon 69005, France
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P. Velex
P. Velex
LaMCoS, UMR CNRS 5259,
e-mail: philippe.velex@insa-lyon.fr
INSA Lyon
, Bât. J. d'Alembert, 20 Avenue Albert Einstein, Villeurbanne Cedex 69 621, France
Search for other works by this author on:
C. Changenet
Mechanical Engineering Department,
ECAM
, Lyon 69005, France
P. Velex
LaMCoS, UMR CNRS 5259,
INSA Lyon
, Bât. J. d'Alembert, 20 Avenue Albert Einstein, Villeurbanne Cedex 69 621, Francee-mail: philippe.velex@insa-lyon.fr
J. Mech. Des. Jun 2008, 130(6): 062603 (6 pages)
Published Online: April 14, 2008
Article history
Received:
April 21, 2007
Revised:
December 18, 2007
Published:
April 14, 2008
Citation
Changenet, C., and Velex, P. (April 14, 2008). "Housing Influence on Churning Losses in Geared Transmissions." ASME. J. Mech. Des. June 2008; 130(6): 062603. https://doi.org/10.1115/1.2900714
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