Engineering a notched belt can be a balancing act between versatility, tensile cord support, and tension distribution. Precisely shaped and spaced notches help to 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 extremely v belt china application specific and deliver vastly different levels of performance.
Unlike flat belts, which rely solely on friction and can track and slide off pulleys, V-belts possess sidewalls that match corresponding sheave grooves, providing additional surface and greater balance. As belts operate, belt tension applies a wedging force perpendicular to their tops, pushing 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 in to the groove of the sheave while operating under stress impacts its performance.
V-belts are made from rubber or synthetic rubber stocks, so they have the versatility to bend around the sheaves in drive systems. Fabric materials of various kinds may cover the stock 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 developed in the 1930s. Belts produced with this profile come in a number of sizes (A, B, C, D, E) and lengths, and so are widely used to displace V-belts in older, existing applications.
They are accustomed to replace belts on industrial machinery manufactured in other parts of the world.
All of the V-belt types noted above are usually available from manufacturers 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 warmth is a significant contributor to premature belt failure.
Wrapped belts have a higher resistance to oils and extreme temps. They can be used as friction clutches during set up.
Raw edge type v-belts are better, generate less heat, allow for smaller pulley diameters, increase power ratings, and provide longer life.
V-belts look like relatively benign and simple 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 1 problem: that strategy is approximately as wrong as possible get.