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Development of a THM 700-R4 Band Friction Test for the SAE #2 Machine
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English
Abstract
An SAE #2 friction test machine procedure has been developed to accurately assess the frictional characteristics of automatic transmission fluids in the band clutch system of a General Motors THM 700-R4 transmission. SAE #2 test conditions were chosen based upon measurements of key operating variables made in a THM 700-R4 equipped vehicle. SAE #2 machine results on several fluids are compared and correlation with results from the vehicle using a reference fluid is shown. The THM 700-R4 SAE #2 machine band test was found to give excellent characterization of fluid frictional properties and friction durability and also a qualitative indication of vehicle shift quality.
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Authors
Citation
Watts, R. and Sparrow, S., "Development of a THM 700-R4 Band Friction Test for the SAE #2 Machine," SAE Technical Paper 881675, 1988, https://doi.org/10.4271/881675.Also In
References
- SAE Recommended Practices-J1499 FEB87 Band Friction Test Machine (SAE) Test Procedure, February 1987
- Ross W. D. Sharer E. M. Bloomquist A. P. Derndon W. B. “Measuring Friction of Single- and Multiple-Wrap Transmission Bands taken from” “SAE Design Practices - Passenger Car Transmissions”, Vol 5 Second 1988 SAE 680424 .
- THM 700-R4 Principles of Operation, Hydra-matic Division, General Motors Corporation 1983
- DEXRON ® -II Automatic Transmission Fluid Specification General Motors Corporation Second 1978
- A commercially available automatic transmission fluid used as a factory-fill.
- High Energy Friction Characteristics and Durability, contained in 4 above.
- Automatic Transmission Fluid, WSP-M2C185A Engineering Material Specification Ford Motor Company publication May 1987
- Hydra-matic Division, General Motors Corporation test procedure.