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Engineering a notched belt is usually a balancing act between versatility, tensile cord support, and stress distribution. Precisely formed and spaced notches help evenly distribute tension forces as the belt bends, thereby helping to prevent undercord cracking and extending belt existence.

Like their synchronous belt cousins, V-belts have undergone tremendous technological development since their invention by John Gates in 1917. New synthetic rubber substances, cover materials, construction strategies, tensile cord advancements, and cross-section profiles have led to an often confusing array of V-belts that are highly application particular and deliver vastly different degrees of performance.
Unlike smooth belts, which rely solely on friction and may track and slide off pulleys, V-belts have sidewalls that fit into corresponding sheave grooves, offering additional surface and greater stability. As belts operate, belt pressure applies a wedging power perpendicular with their tops, pressing their sidewalls against the sides of the sheave grooves, which multiplies frictional forces that allow the drive to transmit higher loads. What sort of V-belt fits into the groove of the sheave while operating under stress impacts its performance.
V-belts are manufactured from rubber or synthetic rubber stocks, so they have the versatility to bend around the sheaves in drive systems. Fabric materials of varied kinds may cover the share material to supply a layer of safety and reinforcement.
V-belts are manufactured in a variety of industry standard cross-sections, or profiles
The classical V-belt profile dates back to industry standards created in the 1930s. Belts manufactured with this profile come in many sizes (A, B, C, D, E) and lengths, and so are widely used to replace V-belts in old, existing applications.
They are accustomed to replace belts on commercial machinery manufactured in other areas of the world.
All of the V-belt types noted over are usually available from manufacturers in “notched” or “cogged” variations. Notches reduce bending stress, allowing the belt to wrap more easily around small diameter pulleys and permitting better temperature dissipation. Excessive heat is a major contributor to premature belt failure.

Wrapped belts have an increased level of resistance to oils and V Belt severe temperature ranges. They can be used as friction clutches during set up.
Raw edge type v-belts are more efficient, generate less heat, allow for smaller pulley diameters, enhance power ratings, and offer longer life.
V-belts look like relatively benign and basic devices. Just measure the top width and circumference, find another belt with the same measurements, and slap it on the drive. There’s only 1 problem: that strategy is about as wrong as possible get.