Engineering a notched belt is definitely a balancing act among flexibility, tensile cord support, and tension distribution. Precisely formed and spaced notches help evenly distribute tension forces as the belt bends, thereby assisting 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 selection of V-belts that are highly application specific and deliver vastly different degrees of performance.
Unlike smooth belts, which rely solely on friction and will track and slide off pulleys, V-belts possess sidewalls that match corresponding sheave grooves, providing additional surface and greater balance. As belts operate, belt pressure applies a wedging push perpendicular to their tops, pushing their sidewalls V Belt against the sides of the sheave grooves, which multiplies frictional forces that allow the drive to transmit higher loads. What sort of V-belt fits into the groove of the sheave while working under pressure impacts its performance.
V-belts are produced from rubber or synthetic rubber stocks, so they possess the versatility to bend around the sheaves in drive systems. Fabric materials of varied types may cover the share material to supply a layer of protection and reinforcement.
V-belts are manufactured in various 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 many sizes (A, B, C, D, E) and lengths, and are widely used to replace V-belts in old, existing applications.
They are accustomed to replace belts on industrial machinery manufactured in other parts of the world.
All of the V-belt types noted above are usually available from producers in “notched” or “cogged” versions. Notches reduce bending stress, enabling the belt to wrap easier around little diameter pulleys and allowing better high temperature dissipation. Excessive temperature is a significant contributor to premature belt failure.
Wrapped belts have an increased resistance to oils and intense temperature ranges. They can be used as friction clutches during set up.
Raw edge type v-belts are better, generate less heat, enable smaller pulley diameters, enhance power ratings, and provide longer life.
V-belts look like relatively benign and simple devices. Just measure the top width and circumference, find another belt with the same sizes, and slap it on the drive. There’s only one problem: that strategy is approximately as wrong as possible get.