Drive belt consists of two pulleys over which an endless belt it passed over them. The mechanical power or rotary motion is transmitted from the driving pulley to the driven pulley because of the frictional grip that exists between the drive belt and the pulley surface.

The portion of the drive belt which is having less tension is called slack side and the one which has higher tension is called tight side. The effective pulling power of the drive belt that causes the rotation of the driven pulley is the difference in tension on the slack and tight side.

The tensions in the tight and slack sides of the drive belt depend on the angle of contact, the drive belts have to be arranged such that the slack side comes above and the tight side comes below the pulleys.

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