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Sprocket
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{{Short description|Toothed wheel or cog}} {{About|a gear or wheel with metal teeth}} [[File:Sprocket16.png|thumb|16 tooth sprocket. Do = Sprocket diameter. Dp = Pitch diameter]] [[File:Chain.gif|thumb|A sprocket and [[roller chain]]]] A '''sprocket''',<ref>{{cite web | url = http://www.merriam-webster.com/dictionary/sprocket | title = Sprocket - Definition | publisher = Merriam-Webster | quote = sprocket, n. 1: a toothed wheel whose teeth engage the links of a chain | access-date = 2011-11-14}}</ref> '''sprocket-wheel'''<ref>{{cite book | title = [[Oxford English Dictionary]] | publisher = Oxford University Press | year = 1989 | edition = 2nd | quote = sprocket, n. 2. b. ellipt. A sprocket-wheel, esp. that of a cycle; and (Cinematogr.), one that propels film by engaging with perforations along its edge.}}</ref> or '''chainwheel''' is a profiled [[wheel]] with teeth that mesh with a [[roller chain|chain]], [[rack and pinion|rack]] or other perforated or indented material.<ref>The Encyclopedia Americana: a library of universal knowledge, sprocket. pg [https://books.google.com/books?id=jvgUAAAAYAAJ&pg=PA460 460]</ref><ref>[https://archive.org/details/elementsmachine00leutgoog Elements of machine design] By Oscar Adolph Leutwiler</ref> The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain passing over it. It is distinguished from a [[gear]] in that sprockets are never meshed together directly, and differs from a [[pulley]] in that sprockets have teeth and pulleys are smooth except for timing pulleys used with toothed belts. Sprockets are used in [[bicycle]]s, [[motorcycle]]s, [[continuous track|tracked vehicles]], and other [[machine]]ry either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track, tape etc. Perhaps the most common form of sprocket may be found in the bicycle, in which the pedal shaft carries a large sprocket-wheel, which drives a chain, which, in turn, drives a small sprocket on the axle of the rear wheel. Early automobiles were also largely driven by sprocket and chain mechanism, a practice largely copied from bicycles. Sprockets are of various designs, a maximum of efficiency being claimed for each by its originator. Sprockets typically do not have a [[flange]]. Some sprockets used with [[toothed belt|timing belts]] have flanges to keep 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 being used instead of belts or ropes and sprocket-wheels instead of pulleys. They can be run at high speed and some forms of chain are so constructed as to be noiseless even at high speed.
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