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TECHNICAL PAPERS

A Simplified Approach to Modeling Thermal Effects in Wet Clutch Engagement: Analytical and Experimental Comparison

[+] Author and Article Information
Coby L. Davis, Farshid Sadeghi, Charles M. Krousgrill

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Tribol 122(1), 110-118 (Jan 07, 1999) (9 pages) doi:10.1115/1.555370 History: Received September 17, 1998; Revised January 07, 1999
Copyright © 2000 by ASME
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References

Forster, H. J., 1977, “Tribological Problems in Automatic Transmissions,” Proceedings of the Institution of Mechanical Engineers, London, pp. 43–54.
Froslie, L. E., Milek, T., and Smith, E. W., 1973, “Automatic Transmission Friction Elements,” Design Practices-Passenger Car Automatic Transmissions, Society of Automotive Engineers, Inc., New York.
Fish, R., “Using the SAE #2 Machine to Evaluate Wet Clutch Drag Losses,” SAE 910803.
Ito,  H., Fujimoto,  K., Eguchi,  M., and Yamamoto,  T., 1993, “Friction Characteristics of a Paper-based Facing for a Wet Clutch Under a Variety of Sliding Conditions,” STLE Tribol. Trans.36, pp. 134–138.
Wu,  H., 1973, “An Analysis of the Engagement of Wet-Clutch Plates,” Wear, 24, pp. 23–33.
El-Sherbiny, M. G., and Newcomb, T. P., 1977, “Numerical Simulation of the Engagement Characteristics of a Wet Clutch,” Oil-Immersed Brakes and Clutches, Mechanical Engineering Publications Limited for the Institute of Mechanical Engineers, New York.
Zagrodzki,  P., 1985, “Numerical Analysis of Temperature Fields and Thermal Stresses in the Friction Discs of a Multidisc Wet Clutch,” Wear, 101, pp. 255–271.
Zagrodzki,  P., 1990, “Analysis of Thermomechanical Phenomena in Multidisc Clutches and Brakes,” Wear, 140, pp. 291–308.
Berger,  E. J., Sadeghi,  F., and Krousgrill,  C. M., 1997, “Analytical and Numerical Modeling of Engagement of Rough, Permeable, Grooved Wet Clutches,” ASME J. Tribol., 119, p. 143.
Greenwood,  J. A., and Williamson,  J. B. P., 1966, “Contact of Nominally Flat Surfaces,” Proc. R. Soc. London, Ser. A, 295, pp. 300–319.
Patir,  N., and Cheng,  H. S., 1979, “Application of Average Flow Model to Lubrication Between Rough Sliding Surfaces,” ASME J. Tribol., 101, pp. 220–230.
Berger,  E. J., Sadeghi,  F., and Krousgrill,  C. M., 1996, “Finite Element Modeling of Engagement of Rough and Grooved Wet Clutches,” ASME J. Tribol., 118, p. 137.
Roelands, C. J. A., 1966, “Correlational Aspects of the Viscosity-Temperature-Pressure Relationship of Lubricating Oils,” Druk, V. R. B., Groingen, Netherlands.
McCool,  J. I., 1987, “Relating Profile Instrument Measurements to the Functional Performance of Rough Surfaces,” ASME J. Tribol., 109, pp. 264–270.
Berger,  E. J., Sadeghi,  F., and Krousgrill,  C. M., 1997, “Torque Transmission Characteristics of Automatic Transmission Wet Clutches: Experimental Results and Numerical Comparison,” STLE Tribol. Trans.40, pp. 539–548.

Figures

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Single contact surface wet clutch engagement model
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Thermal boundary conditions for separator plate
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Schematic of dynamic wet clutch testing machine
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Close-up separator plate holder and platen
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Statistical analysis of a typical clutch surface
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Thermal effects on film thickness (initial speed 400 rad/s, initial temperature 298 K, maximum load 4500 N, inertia 0.028 kg-m2 )
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Thermal effects on viscous torque (initial speed 400 rad/s, initial temperature 298 K, maximum load 4500 N, inertia 0.028 kg-m2 )
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Thermal effects on asperity contact torque (initial speed 400 rad/s, initial temperature 298 K, maximum load 4500 N, inertia 0.028 kg-m2 )
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Thermal effects on lockup time (initial speed 400 rad/s, initial temperature 298 K, maximum load 4500 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 460 rad/s, initial temperature 298 K, maximum load 3798 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 416 rad/s, initial temperature 394 K, maximum load 7495 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 384 rad/s, initial temperature 311 K, maximum load 7424 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 400 rad/s, initial temperature 311 K, maximum load 4378 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 373 rad/s, initial temperature 394 K, maximum load 4324 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 205 rad/s, initial temperature 394 K, maximum load 4306 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 236 rad/s, initial temperature 311 K, maximum load 7477 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 212 rad/s, initial temperature 394 K, maximum load 7477 N, inertia 0.028 kg-m2 )
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Experimental and analytical torque comparison (initial speed 223 rad/s, initial temperature 311 K, maximum load 4342 N, inertia 0.028 kg-m2 )
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Temperature variation during an engagement (initial speed 400 rad/s, initial temperature 296 K, maximum load 4500 N, inertia 0.028 kg-m2 )

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