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Answered 2008-12-15 21:07:38

Torque is increased on the larger, driven gear. The increase can be calculated as the ratio of the radii of the two gears. For example, if the small gear has a radius of 2 cm and the larger gear has a radius of 10 cm, the torque ratio is 10/2 (ten to two), or 5/1 (five to one). So the driven gear is producing 5 times the torque of the driving gear. The speed ratio is the reverse; the driven gear is rotating at 1/5 the speed of the driving gear.

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