What is an Infinitely Variable Transmission?

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Infinitely Variable Transmission:

The IVT is a specific kind of CVT that has not only an infinite number of gear ratios but an “infinite” range additionally. This is often a turn of phrase, it refers to CVTs that may include a “zero ratio”, where the input shaft can turn with none motion of the output shaft while remaining gear. The gear ratio, therein case, isn’t “infinite” but is instead “undefined”.

Most (if not all) IVTs result from the mixture of a CVT with a gear wheel system with a set ratio. The mixture of the fixed ratio of the planet wheel with a particular matching ratio within the CVT side leads to zero output. As an example, consider a transmission with an epicyclic gear set to 1:−1 gear ratio; a 1:1 reverse gear. When the CVT side is ready to 1:1 the 2 ratios add up to zero output. The IVT is usually engaged, even during its zero output. When the CVT is about to higher values it operates conventionally, with increasing forward ratios.

In practice, the epicyclic gear also set to rock bottom possible ratio of the CVT, if reversing isn’t needed or is handled through other means. Reversing is incorporated by setting the epicyclic gear ratio somewhat on top of the bottom ratio of the CVT, providing a spread of reverse ratios.

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