372 Simple epicyclic overdrive gear train

If the sun gear is prevented from rotating and the input shaft and planet carrier are rotated, the pinion gears will be forced to revolve around the fixed sun gear and these pinions will revolve simultaneously on their own axes provided by the carrier pins.

As a result, motion will be transferred from the carrier and pinion gears to the annulus ring gear due to the separate rotary movement of both the planet carrier and the revolving planet gears, thus

Fig. 3.28 Compound epicycle gear train the annulus and therefore the output shaft will be compelled to revolve at a slightly faster speed.

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