Engineering a notched belt can be a balancing act among flexibility, tensile cord support, and stress distribution. Precisely designed and spaced notches help to 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 methods, tensile cord advancements, and cross-section profiles have resulted in an often confusing array of V-belts that are extremely application particular and deliver vastly different degrees of performance.
Unlike smooth belts, which rely solely on friction and may track and slip off pulleys, V-belts have sidewalls that match corresponding sheave grooves, offering additional surface and greater stability. As belts operate, belt pressure applies a wedging pressure 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. What sort of V-belt fits into the groove of the sheave while working under stress impacts its performance.
V-belts are produced 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 standard cross-sections, or profiles
The classical V-belt profile dates back to industry standards created in the 1930s. Belts manufactured with this profile come in a number of 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 areas of the world.
All the V-belt types noted above are usually available from manufacturers in “notched” or “cogged” variations. Notches reduce bending stress, permitting the belt to wrap more easily around small diameter v belt china pulleys and allowing better temperature dissipation. Excessive warmth is a significant contributor to premature belt failure.
Wrapped belts have a higher resistance to oils and intense temperatures. They can be used as friction clutches during start up.
Raw edge type v-belts are better, generate less heat, allow for smaller pulley diameters, increase power ratings, and offer longer life.
V-belts look like relatively benign and simple pieces of equipment. Just measure the best width and circumference, find another belt with the same measurements, and slap it on the drive. There’s only 1 problem: that strategy is about as wrong as possible get.