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Control of Band/Drum Interface Temperature in Automatic Transmissions and the Impact Upon Friction System Durability
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English
Abstract
The importance of controlling band/drum interface temperature to maintain friction system durability in an automatic transmission clutch is investigated in this paper. Frictional durability is extremely important to assure smooth, consistent shifts and long transmission life. A statistically designed series of experiments was run in a SAE No. 2 band test machine to determine the parameters which impact interface temperature. Sump level, sump temperature, engagement speed, system inertia, direct lubrication of the drum surface, and engagement time were all examined. The analysis reveals each of these parameters, with the exception of engagement time, directly influences interface temperature under the tested conditions.
Interface temperature was then linked to frictional system stability. This was accomplished through a second series of experiments where interface temperature was varied by changing only one of the previously identified parameters. Based upon these results, a graph is presented relating interface temperature to system durability. This graph may be used in transmission design to ensure consistent shifts and increased durability of band friction systems.
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Authors
Citation
Castanien, C., "Control of Band/Drum Interface Temperature in Automatic Transmissions and the Impact Upon Friction System Durability," SAE Technical Paper 902147, 1990, https://doi.org/10.4271/902147.Also In
References
- Yoshizawa Kenichi Akashi Teruo Yoshioka Tatsuo “Proposal of New Criteria and Test Methods for the Dynamic Performance of ATF” SAE Technical Paper Series No. 900810 February 1990
- Solt Michael B. “Optimizing Automatic Transmission Clutch Lining Load Distribution Using Finite Element Analysis” SAE Technical Paper Series No. 900559 February 1990
- SAE Recommended Practices-J1499 FEB 87 Band Friction Test Machine (SAE) Test Procedure February 1987
- Watts R.F. Sparrow S.D. “Development of a THM 700-R4 Band Friction Test for the SAE #2 Machine” SAE Technical Paper Series No. 881675 October 1988