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Discussion Boards > Active Subjects > Messages as Posted > Car Tires and Maintenance Forum

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06-18-2009, 11:55

Post: 163490

kwschumm

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What are Continuously Variable Transmissions CVTs

My mental picture of a CVT involved a belt driving two piece conical shaped pulleys. The variable ratios were controlled by moving the two pulley halves closer or further apart.

Early CVTs seemed to be used only on the smallest of low powered cars.

Now they are becoming more common and I was astounded to hear that they are being used on heavy equipment. Furthermore, someone here mentioned that JD had a CVT design that was essentially a gear based transmission.

I'd sure like to understand how a gear based CVT would work. You can't vary the teeth on a gear. You can vary the number of gears but you can't have an infinite number of them and it seems they could never be continuously variable in the true sense of the term.

What was the big breakthrough design that allowed CVTs to become more successful?

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06-18-2009, 21:50

Post: 163497

kwschumm

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What are Continuously Variable Transmissions CVTs

Thanks Frank, that makes sense. It's sort of funny, shortly after posting this Subaru's latest newsletter arrived in my inbox. With their 2010 models they are rolling out CVTs on some of their models. It seems to have increased highway mileage by 15% or so over previous models. They included a link to a video and it shows the design that I was familiar with, two two-piece conical pulleys with a belt. There's something about that design I just don't trust.

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Discussion Boards > Active Subjects > Messages as Posted > Car Tires and Maintenance Forum

Thread 163490 Filter by Poster:
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