Shown here are Dura-Belt powered rollers, which are designed to transmit power and convey loads. Other noise arises from belt rubbing against the flange in some cases, this happens when the shafts aren’t parallel.
Most belt noise arises from the way in which belt teeth entering the pulleys at high speed repeatedly compresses the trapped pockets of air. Noise frequency increases proportionally with belt speed, and noise amplitude increases with belt tension. The company specializes in these power-transmission components its Fairloc hub is a particularly unique offering in that it centers shafts and keeps mounted pulleys perfectly aligned.Īs mentioned, belts are quieter than other power-transmission drive options … but they’re not silent. Shown here are timing belts, timing-belt pulleys, and Fairloc hubs from Stock Drive Instruments/Sterling Instrument (SDP/SI). These ratings are set so the belt will deliver at least 3,000 hours of useful life if the end user properly installs and maintains it. The pulley diameter should never be smaller than the width of the belt. More after the jump. First of all, engineers should always design these belt drives with a sufficient safety factor-in other words, with ample reserve horsepower capacity. Tip: Take note of overload service factors.īelt ratings are generally only 1/15 of the belt’s ultimate strength. Some general guidelines are applicable to all timing belts, including miniature and double-sided belts. Finally, in the case of toothed belts (also called synchronous belts) the pitch is the number of teeth per some length-so a 3-mm pitch means that the belt has one tooth every 3 mm, for example. Belt length is how long the belt would be if cut and laid flat. Minimum wrap angle is a measure of how much the belt wraps around the smallest pulley. Center distance is the distance between the two pulleys’ centers. Pitch diameter is the drive pulley’s diameter. Manufacturers generally describe belts and pulleys with five main geometries. It leverages new materials and geometries, with nine carbon cords embedded within engineered polymer belt and an 11-mm tooth pitch profile for lower tension. Shown here is a Gates Carbon Drive CDN system-lower in cost for new bike applications. Made of polyester, aramid, fiberglass or carbon fiber, these tensile cords make today’s belt drives thoroughly modern power-transmission devices. In addition, the tensile members of today’s belts-cords embedded into the belt rubber that carry the majority of the belt load-are stronger than ever. The main reasons that engineers pick drives with belts and pulleys over other options is that modern varieties require little if no maintenance they’re less expensive than chain drives and they’re quiet and efficient, even up to 95% or more. Such monitoring systems are just one example of how belt-drive technologies have kept pace with 21st-century design concepts. Called CONTI PROTECT and most useful on industrial and mining conveyors, the system uses magnetic markings on the belts to track irregularities in the splice length and detects longitudinal rips before they grow. This setup has an electronic warning system from ContiTech to alert operators when a conveyor is elongating or at risk of ripping.
In a typical setup, the belt also wraps around one or more idler pulleys that keep the belt taut and on track. More after the jump. Updated May 2016 || Industrial belt drives consist of rubber belts that wrap around drive pulleys, in turn driven by electric motors.
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