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TECHNICAL BRIEF

A Model for the Prediction of Churning Losses in Geared Transmissions—Preliminary Results

[+] Author and Article Information
C. Changenet

Mechanical Engineering Department, ECAM, Lyon, France

P. Velex1

LaMCoS, UMR CNRS 5514, INSA de Lyon, Francephilippe.velex@insa-lyon.fr

1

Corresponding author.

J. Mech. Des 129(1), 128-133 (Aug 21, 2006) (6 pages) doi:10.1115/1.2403727 History: Received January 27, 2006; Revised August 21, 2006

A series of formulas are presented which enable accurate predictions of churning losses for one pinion characteristic of automotive transmission geometry. The results are based on dimensional analysis and have been experimentally validated over a wide range of speeds, gear geometries, lubricants, and immersion depths. The case of a pinion-gear pair in mesh has been considered, and it has been proved that, depending on the sense of rotation, the superposition of the individual losses of the pinion and of the gear leads to erroneous figures. A new formula devoted to a pinion and gear rotating anticlockwise has been derived and validated by comparison with experimental evidence.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Oil churning test rig

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Figure 2

Oil flow around the pinions

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Figure 3

Churning losses (gear 4)—Comparisons between the models of Refs. 6-8 and the experimental measurements

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Figure 4

Churning losses (gear 3)—Comparisons between the models of Refs. 6-8 and the experimental measurements

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Figure 5

Churning losses (gear 2)—Comparisons between the models of Refs. 6-8 and the experimental measurements

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Figure 6

Pinion partly immerged in the oil sump—Geometrical data

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Figure 7

Influence of tooth face width

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Figure 8

Comparisons between the experimental results and the results from the dimensional analysis for two gear

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Figure 9

Definition of the senses of rotation

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Figure 10

Schematic representation of the swell effect

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Figure 11

Oil viscosity influence on ΔP

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Figure 12

Rotational speed influence on ΔP

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Figure 13

Schematic representation of the immersion for a pinion-gear pair with a large speed ratio

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Figure 14

Additional churning power loss ΔP

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