Quote:
Originally posted by GregT
Why so complecated? Its possible to make a efficient CVT using only gears, its not used in cars because it requires 2 torque sources.
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There is no way (that I know of) to create a CVT using only gears.
A real CVT allows for infinitely variable gear ratios (or at least between two points). Why? If you look at a motor curve, typically maximum efficiency (ratio of input power to work performed) is at 75% of free speed (25% power). The theory behind the CVT is to keep the motor operating at this free speed and vary the gear ratio during the acceleration phase.
The only CVT's to date are the Belt CVT and the Toroidal CVT. There are also hydro-mechanical CVTs.