Engineering a notched belt is usually a v belt china balancing act among versatility, tensile cord support, and stress distribution. Precisely designed and spaced notches help to evenly distribute tension forces as the belt bends, thereby helping 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 specific and deliver vastly different degrees of 
performance.
Unlike smooth belts, which rely solely on friction and may track and slide off pulleys, V-belts have sidewalls that fit into corresponding sheave grooves, offering additional surface area and greater stability. As belts operate, belt stress applies a wedging push 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. How a V-belt fits in to the groove of the sheave while operating under tension impacts its performance.
V-belts are manufactured 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 share material to provide a layer of safety 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 several sizes (A, B, C, D, Electronic) and lengths, and are widely used to displace V-belts in old, existing applications.
They are used to replace belts on industrial machinery manufactured in other areas of the world.
All of the V-belt types noted over are typically available from producers in “notched” or “cogged” versions. Notches reduce bending tension, allowing the belt to wrap easier around small diameter pulleys and allowing better warmth dissipation. Excessive heat is a significant contributor to premature belt failing.
Wrapped belts have an increased level of resistance to oils and extreme temperatures. 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, enhance power ratings, and provide longer life.
V-belts look like relatively benign and basic pieces of equipment. 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 possible get.