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TECHNICAL PAPERS

An Improved Hydrodynamic Model for Open Wet Transmission Clutches

[+] Author and Article Information
Yiqing Yuan1

 DaimlerChrysler Corporation, 800 Chrysler Dr., Auburn Hills, MI 48326

Eysion A. Liu, James Hill

 DaimlerChrysler Corporation, 800 Chrysler Dr., Auburn Hills, MI 48326

Qian Zou

 Oakland University, Rochester, MI

1

Corresponding author.

J. Fluids Eng 129(3), 333-337 (Sep 05, 2006) (5 pages) doi:10.1115/1.2427088 History: Received May 09, 2006; Revised September 05, 2006

A mathematical model describing the hydrodynamics of the flow within a disengaged wet transmission clutch is presented. The primary improvement of this model over the existing ones is the inclusion of the surface tension effect, which is expressed in the pressure equation as an additional term. The drag torque predicted by the model correlates well with the test data for nongrooved clutch packs. The significance of the surface tension in this type of flows is discussed as well.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of an open clutch pack

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Figure 2

Schematic of a partial oil film within a clutch

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Figure 3

Schematic of contact angle between the oil film and clutch plate

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Figure 4

Oil film outer radius predicted by new model

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Figure 5

Oil film outer radius predicted by Kato’s model

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Figure 6

Comparison of drag torque between model prediction and test for case 1

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Figure 7

Comparison of drag torque between model prediction and test for case 2

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Figure 8

Comparison of drag torque between model prediction and test for case 3

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Figure 9

Comparison of drag torque between model prediction and test for case 4

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