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Differential/Planetary analogy:
The analogy between the differential and the planetary set is as follows:
one of the input bevels is the sun
the other input bevel is the ring
the intermediate bevels are the planets
the ring gear is the carrier.
There are not two suns, it's just that the sun and the ring are the same and are actually interchangeable.
In a standard planetary set, if the planet gears are made infinitely small, the sun gear and the ring gear approach eachother in size and the behavior is almost identical to the differential design proposed by Tytus.
P.J.
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