Engineering a notched belt is certainly a balancing act between versatility, tensile cord support, and stress distribution. Precisely formed and spaced notches help evenly distribute tension forces as the belt bends, thereby helping to prevent undercord cracking and extending belt life.
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 advancements, and cross-section profiles have resulted in an often confusing array of V-belts that are extremely application particular and deliver vastly different degrees of performance.
Unlike smooth belts, which rely solely on friction and can track and slip off pulleys, V-belts have sidewalls that fit into corresponding sheave grooves, providing additional surface and greater stability. As belts operate, belt stress applies a wedging force perpendicular with 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 in to the groove of the sheave while operating under tension impacts its performance.
V-belts are made from rubber or synthetic rubber stocks, so they have the flexibility to bend around the sheaves in drive systems. Fabric materials of varied types may cover the share material to provide a layer of protection and reinforcement.
V-belts are v belt china 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 manufactured with this profile come in several sizes (A, B, C, D, Electronic) and lengths, and so are widely used to displace V-belts in older, existing applications.
They are used to replace belts on industrial machinery manufactured in other parts of the world.
All of the V-belt types noted over are usually available from producers in “notched” or “cogged” versions. Notches reduce bending tension, permitting the belt to wrap easier around small diameter pulleys and allowing better high temperature dissipation. Excessive warmth is a significant contributor to premature belt failing.
Wrapped belts have a higher resistance to oils and extreme temperature ranges. They can be used 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 devices. Just measure the top width and circumference, discover another belt with the same sizes, and slap it on the drive. There’s only 1 problem: that approach is approximately as wrong as you can get.