Engineering a v belt china notched belt is a balancing act among 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 existence.
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 specific and deliver vastly different levels of performance.
Unlike smooth belts, which rely solely on friction and may track and slip off pulleys, V-belts possess sidewalls that match corresponding sheave grooves, offering additional surface area and greater balance. As belts operate, belt pressure applies a wedging power 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 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 kinds may cover the share material to provide a layer of protection and reinforcement.
V-belts are manufactured in a variety of industry standard cross-sections, or profiles
The classical V-belt profile dates back to industry standards developed in the 1930s. Belts manufactured with this profile can be found in a number of sizes (A, B, C, D, E) and lengths, and are widely used to displace V-belts in old, existing applications.
They are accustomed to replace belts on commercial machinery manufactured in other areas of the world.
All the V-belt types noted above are typically available from producers in “notched” or “cogged” variations. Notches reduce bending stress, allowing the belt to wrap easier around small diameter pulleys and permitting better temperature dissipation. Excessive temperature is a significant contributor to premature belt failing.
Wrapped belts have a higher level of resistance to oils and severe temperature ranges. They can be used as friction clutches during start up.
Raw edge type v-belts are more efficient, generate less heat, allow for smaller pulley diameters, boost power ratings, and offer longer life.
V-belts appear to be relatively benign and simple pieces 
of equipment. Just measure the top width and circumference, discover another belt with the same dimensions, and slap it on the drive. There’s only one problem: that approach is approximately as wrong as you can get.