Toroidal-type continuously variable transmission for automobiles
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United States of America Patent
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Feb 25, 2003
Grant Date -
Jan 24, 2002
app pub date -
Mar 22, 2001
filing date -
Mar 23, 2000
priority date (Note) -
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Abstract
A toroidal-type continuously variable transmission (CVT), including rolling elements having traction surfaces cooperating with each other to transmit a power between the rolling elements via a traction oil film formed between the traction surfaces. The traction surfaces have the microstructure that is defined with respect to a thickness of the traction oil film formed when the temperature of the traction portion of the traction surface is high, to thereby exhibit high traction coefficient even in the high-temperature operating condition.
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