What Is a Continuously Variable Transaxle?

The need for gears with teeth may one day be eliminated by CVT technology.

Vehicles equipped with a continuously variable transaxle (CVT) can save drivers about 6 percent in fuel costs, which could be $1,500 or more during an automobile's life. Surprisingly, the concept behind this fuel efficient technology is actually more than 500-years-old.

CVT Concept

The concept behind the CVT was developed by Leonardo da Vinci and eliminates the need for gears with teeth that cause jerky transitions from one gear to the next. With the CVT, there are virtually limitless ratios through which the transmission itself can cycle, specific to a variety of driving variables such as speed, incline and road condition --- all without the need to shift.

Past Uses

The first patent for a CVT was acquired by Daimler-Benz in the 1880s and the technology has been used in various applications, such as tractors and small city cars over the years. With increased usage, this technology could introduce a fundamental change in the way cars move.

CVT Benefits

According to the U.S. Department of Energy, there are many benefits that arise from the use of CVT technology. Among these are seamless shifting, no need for frequent downshifting and increased fuel economy. The intuitive design of the CVT also requires less maintenance and is less prone to damage related to acceleration and deceleration.

References

• Fueleconomy.gov: Transmission Technologies
• Sae.org: Audi takes CVT from 15th century to 21st century
• Gadgetsguru.com: How CVT Work

Resources

• Continuously Variable Transaxle Information and Specifications