Engineering a notched belt is definitely a balancing act among versatility, tensile cord support, and tension distribution. Precisely designed 
and spaced notches help evenly distribute tension forces as the belt bends, thereby assisting 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 compounds, cover materials, construction methods, tensile cord advancements, and cross-section profiles have resulted in an often confusing array of V-belts that are highly application particular and deliver vastly different degrees of performance.
Unlike toned belts, which rely solely on friction and will 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 drive 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 tension impacts its performance.
V-belts are produced from rubber or synthetic rubber stocks, so they have the flexibility to bend around the sheaves in drive systems. Fabric materials of varied kinds may cover the stock material to supply a layer of security and reinforcement.
V-belts are manufactured in a variety of industry standard cross-sections, or profiles
The classical V-belt profile goes back to industry standards developed in the 1930s. Belts produced with this profile can be found in a number of sizes (A, B, C, D, Electronic) and lengths, and so are widely used to displace V-belts in older, 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 above are usually available from producers in “notched” or “cogged” versions. Notches reduce bending tension, permitting the belt to wrap easier around little diameter pulleys and allowing better warmth dissipation. Excessive temperature is a significant contributor to premature belt failing.
Wrapped belts have a higher resistance to oils and extreme temps. They can be utilized as friction clutches during set up.
Raw edge type v-belts are more efficient, generate less heat, allow for smaller pulley diameters, increase power ratings, and offer longer life.
V-belts look like relatively benign and simple pieces of equipment. Just measure the best width and V Belt 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.