TY - JOUR
T1 - Technology of a traction drive CVT
T2 - Past, present and future
AU - Machida, H.
PY - 2005
Y1 - 2005
N2 - In November 1999, traction drive half-toroidal CVT units were installed in mass-production vehicles for the first time in the world. Looking back in history, Charles W. Hunt of Richmond, New York, U.S.A., was the first to conceive the principle of a toroidal type CVT. But, his invention had not been commercialized for 120 years mainly because of poor endurance performance. Finally, after more than 21 and a half years of developments and advancements in basic lubrication and material technologies, technical problems of the traction drive CVT were successfully resolved. Today's technology aided in the achievement of a safe and comfortable traction drive CVT, which demands a well thought-out design, advanced materials, precise machining, and superior field simulation techniques. This paper describes detailed deliberations regarding rolling fatigue, bending fatigue, and white structure flaking for assuring endurance and performance of the traction drive CVT. A traction drive unit was examined after 118,500 km of running in the field for verification of CVT technology. Therefore, the half-toroidal CVT unit can play a role as an automotive transmission with appealing function and adequate durability.
AB - In November 1999, traction drive half-toroidal CVT units were installed in mass-production vehicles for the first time in the world. Looking back in history, Charles W. Hunt of Richmond, New York, U.S.A., was the first to conceive the principle of a toroidal type CVT. But, his invention had not been commercialized for 120 years mainly because of poor endurance performance. Finally, after more than 21 and a half years of developments and advancements in basic lubrication and material technologies, technical problems of the traction drive CVT were successfully resolved. Today's technology aided in the achievement of a safe and comfortable traction drive CVT, which demands a well thought-out design, advanced materials, precise machining, and superior field simulation techniques. This paper describes detailed deliberations regarding rolling fatigue, bending fatigue, and white structure flaking for assuring endurance and performance of the traction drive CVT. A traction drive unit was examined after 118,500 km of running in the field for verification of CVT technology. Therefore, the half-toroidal CVT unit can play a role as an automotive transmission with appealing function and adequate durability.
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U2 - 10.1016/s0167-8922(05)80004-5
DO - 10.1016/s0167-8922(05)80004-5
M3 - Article
AN - SCOPUS:33745139558
VL - 48
SP - 3
EP - 13
JO - Tribology and Interface Engineering Series
JF - Tribology and Interface Engineering Series
SN - 1572-3364
ER -