Do some late model automatic transmissions use a metal drive belt and variable diameter pulleys....?

Question

to create an infinite number of gear ratios?

Answer 1

The Ford Five Hundred & Freestyle both use a CVT, as does the Hybrid Escape

Answer 2

What you described is a continuously variable transmission (CVT), and the concept has been around for quite some time. The main benefit is that the engine can run at its optimum RPM (usually around 2000rpm) for efficiency. However, there are several downsides:

* The various different types of CVT can only handle so much power from an engine. Nissan has some new CVTs that can handle upwards of 250hp, but older CVTs were very power-limited.
* Drivers tend not to like the feel. Depending on the design of the CVT, the transmission can lead to real or perceived lag. Real lag is when the transmission belt actually stretches, taking more time to adjust to the correct position. Perceived lag is a psychological issue -- drivers expect engine RPMs to be higher as they go faster, but with a CVT that doesn't happen. As well, there's no "shift", which just doesn't "feel" right.

Some CVTs have preset "shift points" that make the CVT feel like a normal automatic transmission, but that defeats the purpose of a CVT. It's only done to address perceived lag.

Answer 3

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Answer 4

most golf buggies use this setup. Subaru used it in a little hatchback called the "Justy" back in the late 80's.