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Research Papers: Power Transmissions and Gearing

Housing Influence on Churning Losses in Geared Transmissions

[+] Author and Article Information
C. Changenet

Mechanical Engineering Department,  ECAM, Lyon 69005, France

P. Velex1

LaMCoS, UMR CNRS 5259,  INSA Lyon, Bât. J. d'Alembert, 20 Avenue Albert Einstein, Villeurbanne Cedex 69 621, Francephilippe.velex@insa-lyon.fr

1

Corresponding author.

J. Mech. Des 130(6), 062603 (Apr 14, 2008) (6 pages) doi:10.1115/1.2900714 History: Received April 21, 2007; Revised December 18, 2007; Published April 14, 2008

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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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of the test rig

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Figure 3

Housing shape modifications

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Figure 4

Churning losses at thermal equilibrium

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Figure 5

Influence of oil properties

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Figure 6

Modification of oil sump volume

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Free surface flow

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Figure 8

Gravity waves traveling over the oil surface

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Figure 9

Influence of axial and radial clearances on churning losses

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Figure 10

Extrados and intrados surfaces

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Figure 11

Influence of axial clearances at low rotational speeds on experimental churning losses

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Figure 12

Geometrical parameters for the influence of flanges

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Figure 13

Influence of axial clearances at high rotational speeds on experimental churning losses

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Figure 14

Effect of unsymmetrical clearances on experimental churning losses

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