Engineering a notched belt is a balancing act among flexibility, tensile cord support, and tension distribution. Precisely shaped and spaced notches help to evenly distribute stress 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 advancements, and cross-section profiles have led to an often confusing array of V-belts that are highly application particular and deliver vastly different degrees 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 and greater stability. As belts operate, belt tension applies a wedging drive 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 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 various types may cover the share material to supply a layer of safety and reinforcement.
V-belts are manufactured in various industry standard cross-sections, or profiles
The classical V-belt profile dates back to industry standards created in the 1930s. Belts produced with this profile can be found in many sizes (A, B, C, D, E) and lengths, and so are widely used to displace V-belts in 
older, existing applications.
They are used to replace belts on commercial machinery manufactured in other parts of the world.
All of the V-belt types noted over are typically available from manufacturers in “notched” or “cogged” variations. Notches reduce bending stress, permitting the belt to wrap more easily around small diameter pulleys and enabling better warmth dissipation. Excessive temperature is a significant contributor to premature belt failing.
Wrapped belts have a higher level of resistance to oils and severe temperature v belt china ranges. They can be utilized as friction clutches during start up.
Raw edge type v-belts are more efficient, generate less heat, enable smaller pulley diameters, enhance power ratings, and provide longer life.
V-belts appear to be relatively benign and basic 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 about as wrong as you can get.