Engineering a notched belt is a balancing act among flexibility, tensile cord support, and stress distribution. Precisely shaped and spaced notches help to 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 v belt china technological development since their invention by John Gates in 1917. New synthetic rubber compounds, 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 particular and deliver vastly different degrees of performance.
Unlike toned belts, which rely solely on friction and can track and slide off pulleys, V-belts have sidewalls that match corresponding sheave grooves, providing additional surface area and greater stability. As belts operate, belt pressure applies a wedging power perpendicular to their tops, pushing their sidewalls against the sides of the sheave grooves, which multiplies frictional forces that allow the drive to transmit higher loads. How a V-belt fits in to the groove of the sheave while working under pressure impacts its performance.
V-belts are manufactured from rubber or synthetic rubber stocks, so they possess the flexibility to bend around the sheaves in drive systems. Fabric materials of various types may cover the stock material to provide 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 dates back to industry standards created in the 1930s. Belts produced with this profile come in several sizes (A, B, C, D, Electronic) and lengths, and so are widely used to replace V-belts in old, existing applications.
They are accustomed to replace belts on commercial machinery manufactured in other parts of the world.
All the V-belt types noted above are typically available from manufacturers in “notched” or “cogged” variations. Notches reduce bending stress, allowing the belt to wrap easier around small diameter pulleys and permitting better heat dissipation. Excessive heat is a significant contributor to premature belt failing.
Wrapped belts have a higher resistance to oils and intense temps. They can be utilized as friction clutches during start up.
Raw edge type v-belts are better, generate less heat, allow for smaller pulley diameters, enhance power ratings, and provide longer life.
V-belts look like relatively benign and basic devices. Just measure the best width and circumference, find another belt with the same dimensions, and slap it on the drive. There’s only one problem: that approach is about as wrong as you can get.