Infinitely Variable Transmissions Using a Toroidal Traction Variator Web Seminar RePlay

An Infinitely Variable Transmission (IVT) is a subset of a CVT (Continuously Variable Transmission) defined as a device that has a range of ratios of input shaft speed to output shaft speed which includes an Infinite ratio in which the output speed is zero.  Typically these devices include both positive and negative ratios on either side of zero resulting in the ability to move forward and reverse from rest without a clutch:  IVTs can improve vehicle performance while maintaining or exceeding benchmark functionality and performance. IVTs are a good candidate for future, fuel-efficient vehicles, particularly hybrids and AWDs. An IVT can maintain superb functionality and performance while reducing fleet CO₂ levels. No vehicles other than heavy tractors currently use IVT transmissions.  A number of companies have looked at implementing IVT but they have failed to find an economical solution with sufficient upside to warrant its introduction, despite the attractive functional benefits. The use of the newly developed Double Roller Full Toroidal Variator - Continuously Variable Transmission (DFTV-CVT) has enabled a much simpler IVT solution that can be manufactured for potentially a lower cost than other belt or chain style CVT designs and / or multispeed transmissions The technology presented in this Webinar is based on the combination of a Double Roller Toroidal Traction Drive (DFTV-CVT) with a Planetary gear train (PGT).

This two-hour course will discuss the packaging, functionality, and economics of IVT architecture and expose the positive and negative aspects of IVT. The IVTs discussed use a particular type of CVT called a Double Roller Full Toroidal Variator (DFTV) which is the most compact and efficient CVT technology currently available.