Engineering a notched belt can be a balancing act among versatility, tensile cord support, and tension distribution. Precisely designed and spaced v belt china notches help evenly distribute tension forces as the belt bends, thereby assisting 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 led to an often confusing array of V-belts that are extremely application particular and deliver vastly different levels of performance.
Unlike flat belts, which rely solely on friction and can track and slip off pulleys, V-belts possess sidewalls that fit into corresponding sheave grooves, providing additional surface area and greater stability. As belts operate, belt stress applies a wedging power perpendicular to their tops, pushing 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 into the groove of the sheave while working under pressure 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 various kinds may cover the share material to supply a layer of security 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 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 above are typically available from manufacturers in “notched” or “cogged” variations. Notches reduce bending stress, enabling the belt to wrap easier around small diameter pulleys and permitting better temperature dissipation. Excessive heat is a significant contributor to premature belt failure.

Wrapped belts have a higher level of resistance to oils and intense temperatures. They can be used as friction clutches during set up.
Raw edge type v-belts are better, generate less heat, enable smaller pulley diameters, boost power ratings, and provide longer life.
V-belts look like relatively benign and simple pieces of equipment. Just measure the top width and circumference, find another belt with the same dimensions, and slap it on the drive. There’s only 1 problem: that approach is about as wrong as you can get.