Engineering a notched belt is definitely a balancing act between flexibility, tensile cord support, and tension distribution. Precisely shaped and spaced notches help to evenly distribute tension forces as the belt bends, thereby helping to prevent undercord cracking and extending belt lifestyle.
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 v belt china 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 smooth 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 stability. As belts operate, belt tension applies a wedging drive perpendicular with their tops, pushing their sidewalls against the sides of the sheave grooves, which multiplies frictional forces that permit 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 produced from rubber or synthetic rubber stocks, so they possess the flexibility 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 regular 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 many sizes (A, B, C, D, E) and lengths, and are widely used to replace V-belts in old, existing applications.
They are used to replace belts on industrial machinery manufactured in other parts of the world.
All the V-belt types noted over are usually available from manufacturers in “notched” or “cogged” versions. Notches reduce bending tension, enabling the belt to wrap easier around small diameter pulleys and permitting better high temperature dissipation. Excessive warmth is a significant contributor to premature belt failing.
Wrapped belts have an increased resistance to oils and intense temperature ranges. They can be used 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 appear to be relatively benign and simple devices. Just measure the best width and circumference, find another belt with the same measurements, and slap it on the drive. There’s only one problem: that strategy is approximately as wrong as you can get.