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 materials.[5][6] The name ‘sprocket’ applies generally to any wheel upon which radial projections engage a chain moving over it. It is distinguished from a equipment in that sprockets are never meshed together sprockets directly, and differs from a pulley for the reason that sprockets have tooth and pulleys are simple.
Sprockets are found in bicycles, motorcycles, vehicles, tracked automobiles, 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. Perhaps the most common form of sprocket could be within the bicycle, where the pedal shaft carries a large sprocket-wheel, which drives a chain, which, subsequently, drives a little sprocket on the axle of the rear wheel. Early automobiles were also largely powered by sprocket and chain system, a practice largely copied from bicycles.
Sprockets are of various designs, a maximum of efficiency getting claimed for every by the originator. Sprockets typically don’t have a flange. Some sprockets used with timing belts possess flanges to keep carefully the timing belt centered. Sprockets and chains are also utilized for power transmission from one shaft to some other where slippage isn’t admissible, sprocket chains getting used rather than belts or ropes and sprocket-wheels rather than pulleys. They could be run at high speed plus some forms of chain are so constructed concerning be noiseless actually at high speed.