Engineering a notched belt can be a balancing act among flexibility, tensile cord support, and stress distribution. Precisely shaped and spaced notches help evenly distribute stress forces as the belt bends, thereby assisting to prevent undercord cracking and extending belt life.

Like their synchronous belt cousins, V Belt 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 resulted in an often confusing array of V-belts that are extremely application specific and deliver vastly different degrees of performance.
Unlike toned belts, which rely solely on friction and may track and slide off pulleys, V-belts possess sidewalls that match corresponding sheave grooves, providing additional surface and greater balance. As belts operate, belt stress applies a wedging force perpendicular to their tops, pushing their sidewalls against the sides of the sheave grooves, which multiplies frictional forces that permit the drive to transmit higher loads. How a V-belt fits in to the groove of the sheave while operating under pressure impacts its performance.
V-belts are produced from rubber or synthetic rubber stocks, so they possess the flexibility to bend around the sheaves in drive systems. Fabric materials of various types may cover the share material to supply a layer of protection and reinforcement.
V-belts are manufactured in a variety of industry regular cross-sections, or profiles
The classical V-belt profile dates back to industry standards created in the 1930s. Belts produced with this profile come in many sizes (A, B, C, D, E) and lengths, and are widely used to replace V-belts in older, existing applications.
They are accustomed to replace belts on commercial machinery manufactured in other areas of the world.
All the V-belt types noted over are usually available from manufacturers in “notched” or “cogged” versions. Notches reduce bending stress, allowing the belt to wrap easier around little diameter pulleys and enabling better warmth dissipation. Excessive heat is a major contributor to premature belt failure.

Wrapped belts have a higher resistance to oils and severe temperatures. They can be utilized as friction clutches during set up.
Raw edge type v-belts are more efficient, generate less heat, enable smaller pulley diameters, increase power ratings, and provide longer life.
V-belts appear to be relatively benign and simple devices. Just measure the top width and circumference, find another belt with the same sizes, and slap it on the drive. There’s only 1 problem: that approach is approximately as wrong as possible get.