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Comparing a CVT to a Four-speed Automatic Transmission on Stress to the ATF
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 06, 2002 by SAE International in United States
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This study focused on two areas of interest to CVT fluid developers. The primary set of experiments investigated whether continuously variable transmissions (CVTs) and their conventional step-type automatic transmission counterparts stress their fluids differently. The investigation compared the push-belt CVT (PB-CVT) in a '98 Nissan Bluebird to the General Motors (GM) Hydra-Matic 4L60 (four-speed) automatic transmission. Chemical, physical and performance comparisons of fresh and used fluids revealed the fluid stresses from the Nissan Bluebird CVT were similar to those from the 4L60 transmission. A second set of tests probed the question of how well results from two standard steel-on-steel friction bench tests correlate to CVT dynamometer (belt box) findings. The bench test models captured about half of the critical trends in the belt box data, as evidenced by prediction R2 values in the 0.5 to 0.7 range.
- Samuel H. Tersigni - Ethyl Petroleum Additives, Inc., Richmond, Virginia, USA
- Ramnath N. Iyer - Ethyl Petroleum Additives, Inc., Richmond, Virginia, USA
- Tracy A. McCombs - Ethyl Petroleum Additives, Inc., Richmond, Virginia, USA
- Mark S. Jones - Ethyl Petroleum Additives, Ltd., Bracknell, Berkshire, United Kingdom
- Kenji Yatsunami - Ethyl Japan Corp., Tokyo, Japan
CitationTersigni, S., Iyer, R., McCombs, T., Jones, M. et al., "Comparing a CVT to a Four-speed Automatic Transmission on Stress to the ATF," SAE Technical Paper 2002-01-1694, 2002, https://doi.org/10.4271/2002-01-1694.
- Birch, S. Audi Takes CVT from 15 th century to 21 st century Automotive Engineering International January 2000 68 71 Yamaguchi, J. Mitsubishi's new GDI applications Automotive Engineering International February 2000 146 157 Yamaguchi, J. Nissan's Extroid CVT Automotive Engineering International February 2000 157 165 Adam, P.S. The Shape of Transmission Fluids to Come Lubes ‘n’ Greases January 2000 38 42 Scott, D. First torque-converter CVT targeted for VW Passat WARD'S Engine and Vehicle Technology Update 15 November 1998 7
- Kurosawa, M. Kobayashi, M. Tominaga, M. Development of a high torque capacity belt-drive CVT with a torque converter JSAE Review 20 1999 281 287
- Murakami et al. Development and Testing of CVT Fluid for Nissan Toroidal CVT SAE Paper 1999-01-3613 Willermet, P. Traction drive continuously variable transmissions Detroit STLE conference on Automotive Tribology for the Millennium 24 August 1999 Detroit
- Huston, M.E. et al. Shifting from Automatic to Continuously Variable Transmissions: A Look at Fluid Technology Requirements SAE Paper 1999-01-3614 Watts, R.F. Richard, K.M. CVT lubrication: the effect of lubricants on the frictional characteristics of the belt-pulley interface Goteberg, Sweden
- Kakegawa, K. Mitsui, H. Fluids for high torque transmitting belt-drive CVTs '98 TVT Symposium November 1998 Yokohama
- Optimol Instruments Friedenstrasse 10, D-81671, Munich, Germany
- Box, G. Hunter, W. Hunter, J. Statistics for Experimenters Wiley & Sons 1978
- Iyer, R. Devlin M. Harris, D. Relationship between thin film properties of fluids and their performance in continuously variable transmissions 6 th Annual Fuels and Lubes Asia Conference 2000 Singapore