Engineering a notched belt is certainly a balancing act between flexibility, tensile cord support, and stress distribution. Precisely designed and spaced notches help evenly distribute tension forces as the belt bends, thereby assisting 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 compounds, cover materials, construction strategies, tensile cord advancements, and cross-section profiles have led to an often confusing selection of V-belts that are extremely application particular and deliver vastly v belt china different levels of performance.
Unlike toned belts, which rely solely on friction and may track and slide off pulleys, V-belts have sidewalls that fit into corresponding sheave grooves, providing additional surface and greater balance. As belts operate, belt stress applies a wedging pressure perpendicular to their tops, pressing 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 made 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 stock material to provide a layer of protection and reinforcement.
V-belts are manufactured in various industry regular cross-sections, or profiles
The classical V-belt profile goes back to industry standards created in the 1930s. Belts manufactured with this profile can be found in many sizes (A, B, C, D, Electronic) and lengths, and are widely used to replace V-belts in old, existing applications.
They are used 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 little diameter pulleys and allowing better high temperature dissipation. Excessive temperature is a major contributor to premature belt failing.
Wrapped belts have an increased resistance to oils and intense temperatures. They can be utilized as friction clutches during start up.
Raw edge type v-belts are better, generate less heat, allow for smaller pulley diameters, boost power ratings, and offer longer life.
V-belts appear to be relatively benign and basic pieces of equipment. Just measure the top width and circumference, find another belt with the same sizes, and slap it on the drive. There’s only one problem: that strategy is about as wrong as you can get.