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Using the SAE #2 Machine to Evaluate Wet Clutch Drag Losses
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English
Abstract
The study of energy losses in disengaged wet clutches is important to efforts to maximize the efficiency of automatic transmissions. This paper describes a simple, accurate method of investigating clutch drag using the SAE #2 machine. By recording coast down speed versus time with known inertia, average and instantaneous torques can be calculated. Bearing and component losses can also be identified by running empty and partially built clutches. Many individual variables can be studied under laboratory controlled conditions. Friction plate geometry, surface finish, groove design, and plate flatness are evaluated at various levels of pack clearance, oil flow, oil level, and temperature. The influence of clutch speed on the magnitude of power loss is also shown. Results are analyzed to demonstrate the relative contribution of each factor. Conclusions are drawn to maximize effectiveness of effort to reduce power loss.
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Citation
Fish, R., "Using the SAE #2 Machine to Evaluate Wet Clutch Drag Losses," SAE Technical Paper 910803, 1991, https://doi.org/10.4271/910803.Also In
References
- Smith G. R. Ross W. D. Silbert P. L. Herndon W. B. “Putting Automatic Transmission Clutch Friction Researchers on Speaking Terms” Paper 670051 Automotive Engineering Congress Jan 1967
- Anderson A. E. “Friction and Wear of Paper Type Wet Friction Elements” Paper 720521 National Automobile Engineering Meeting May 1972
- Fish R. L. “Oil - Friction Material Interaction and the Effects of Conditions of Use” Paper 740655 National Combined Meetings Sept 1974
- Lloyd F. A. “Parameters Contributing to Power Loss in Disengaged Wet Clutches” Paper 740676 National Combined Meetings Sept 1974
- Ross Phillip J. “Taguchi Techniques for Quality Engineering” McGraw Hill, Inc. 1988 0-07-053866-2