sprocket wheel

A sprocket[1] or sprocket-wheel[2] is a profiled wheel with teeth, or cogs,[3][4] that mesh with a chain, monitor or other perforated or indented material.[5][6] The name ‘sprocket’ applies generally to any wheel where radial projections engage a chain moving over it. It is distinguished from a equipment in that sprockets are never meshed together straight, and differs from a pulley in that sprockets have teeth and pulleys are simple.

Sprockets are used in bicycles, motorcycles, vehicles, tracked vehicles, and other machinery either to transmit rotary motion between two shafts where gears are unsuitable or even to impart linear movement to a track, tape etc. Maybe the most common form of sprocket could be within the bicycle, where the pedal shaft carries a big sprocket-wheel, which drives a chain, which, in turn, drives a little sprocket on the axle of the trunk wheel. Early automobiles had been also largely powered by sprocket and chain mechanism, a practice mainly copied from bicycles.

Sprockets are of various designs, a maximum of efficiency becoming claimed for every by the originator. Sprockets typically do not have a flange. Some sprockets used with timing belts possess flanges to keep carefully the timing belt centered. Sprockets and chains are also used for power transmission from one shaft to another where slippage is not admissible, sprocket chains getting used instead of belts or ropes and sprocket-wheels rather than pulleys. They could be run at high speed and some types of chain are so constructed as to be noiseless actually at high speed.

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