The most common systems for transmitting power from a drive to a driven shaft are belt, gear, and chain drives. But V-belt drive systems, also called friction drives (because power can be transmitted because of this of the belt's adherence to the pulley) are an economical option for industrial, auto, commercial, agricultural, and house appliance applications. V-belt drives are also simple to install, require no lubrication, and dampen shock load.
Here's the catch: Standard friction drives may both slip and creep, resulting in inexact velocity ratios or degraded timing precision between input and output shafts. Because of this, it is essential to choose a belt befitting the application accessible.
Belt drives are among the earliest power transmitting systems and were widely used during the Industrial Revolution. Then, toned belts conveyed power over huge distances and were made from leather. Later, needs for more powerful machinery, and the development of large markets such as the automobile sector spurred new belt styles. V-belts, with a trapezoidal or V shape, made of rubber, neoprene, and urethane synthetic materials, replaced flat belts. Now, the increased overall surface area material of contemporary belts adheres to pulley grooves through friction power, to lessen the tension necessary to transmit torque. The top section of the belt, called the tension or insulation section, consists of fiber cords for increased strength since it carries the strain of traction power. It can help hold tension members in place and functions as a binder for greater adhesion between cords and various other sections. This way, heat build-up is decreased, extending belt life.
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V-Belts are the most common kind of drive belt used for power transmitting. Their primary function is definitely to transmit power from a primary source, such as a motor, to a secondary driven unit. They offer the best combination of traction, acceleration transfer, load distribution, and extended service life. Most are limitless and their cross section is certainly trapezoidal or “V” designed. The “V” form of the belt tracks in a likewise designed groove on a pulley or sheave. The v-belt wedges in to the groove as the load boosts creating power distribution and torque. V-belts are commonly made of rubber or polymer or there may be fibers embedded for added strength and reinforcement.
V-belts are generally within two construction types: envelope (wrapped) and raw edge.

Wrapped belts have a higher resistance to oils and intense temperature ranges. They can be utilized as friction clutches during start up.
Raw edge type v-belts are better, generate less heat, enable smaller pulley diameters, increase power ratings, and offer longer life.
V-belts look like relatively benign and basic pieces of equipment. Just measure the best width and circumference, find another belt with the same dimensions, and slap it on the drive. There's only one problem: that strategy is about as wrong as possible get.