Differential Gear Box
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A differential, found in automobiles and wheeled vehicles, is a three-shaft gear train with a distinctive property: the angular velocity of one shaft is either an average or fixed multiple of the velocities of the others. Its purpose is to allow the outer drive wheel to rotate faster than the inner during a turn, as the vehicle needs this difference in speed for wheels on a turning curve. The sum of the two driving wheels' rotational speeds equals the input shaft's velocity; an increase in one wheel's speed is balanced by a decrease in the other's.
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