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It is essentially a pair of rolling cylinders with the motion of one cylinder being transferred to the other by a belt. The transmitted torque is due to differences in tension that occur in the belt during operation. This difference results in a tight side and slack side for the belt
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Flat: produces little noise, can transmit power over long distances. Crowned pulleys are used to keep the belts from running off the pulleys
Round: has a circular cross-section and is used with grooved pulleys
V belts: are used with grooved pulleys, less efficient than flat belts
Timing belts: required toothed wheels; it can run at slow or fast speed, does not stretch or slip
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