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sprocket

 
Dictionary: sprock·et   (sprŏk'ĭt) pronunciation
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n.
  1. Any of various toothlike projections arranged on a wheel rim to engage the links of a chain.
  2. A cylinder with a toothed rim that engages in the perforations of photographic or movie film to pull it through a camera or projector.

[Origin unknown.]


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Military Dictionary: sprocket
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(DOD, NATO) In naval mine warfare, an anti-sweep device included in a mine mooring to allow a sweep wire to pass through the mooring without parting the mine from its sinker.

WordNet: sprocket
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Note: click on a word meaning below to see its connections and related words.

The noun has 3 meanings:

Meaning #1: roller that has teeth on the rims to pull film or paper through

Meaning #2: thin wheel with teeth that engage with a chain
  Synonym: sprocket wheel

Meaning #3: tooth on the rim of gear wheel
  Synonym: cog

Wikipedia: Sprocket
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 This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2006)
This article is about a gear or wheel with metal teeth. For the television comedy sketch, see Sprockets (television).
16T type sprocket
Do: Sprocket diameter
Dp: Pitch diameter
A sprocket and roller chain

A sprocket is a profiled wheel with teeth that meshes with a chain, track or other perforated or indented material. It is distinguished from a gear in that sprockets are never meshed together directly, and from a pulley by not usually having a flange at each side.

Sprockets are used in bicycles, motorcycles, cars, tanks, and other machinery either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track, tape etc.

Contents

Cycles

In the case of bicycle chains, it is possible to modify the overall gear ratio of the chain drive by varying the diameter (and therefore, the tooth count) of the sprockets on each side of the chain. This is the basis of Derailleur gears. A 10-speed bicycle, by providing two different-sized driving sprockets and five different-sized driven sprockets, allows up to ten different gear ratios. The resulting lower gear ratios make the bike easier to pedal up hills while the higher gear ratios make the bike faster to pedal on flat roads. In a similar way, manually changing the sprockets on a motorcycle can change the characteristics of acceleration and top speed by modifying the final drive gear ratio.

Tracked vehicles

A tank sprocket

In the case of vehicles with caterpillar tracks the engine-driven toothed-wheel transmitting motion to the tracks is known as the drive sprocket and may be positioned at the front or back of the vehicle, or in some cases, both. It can also be a third sprocket, elevated, driving the track.

Film and paper

Sprockets are used in the film transport mechanisms of movie projectors and movie cameras. In this case, the sprocket wheels engage film perforations in the film stock.

Sprocket feed was also used for punched tape and is used for paper feed to some computer printers.

External links

See also

v • d • e
Gears
Gear systems Gears large.jpg
Gear shapes
Geartooth profiles
Gear mechanics
Examples
In Bicycles: Cogset • Derailleur gears • Hub gear • Shaft-driven bicycle • Sprocket
In Horology: Wheel train
See also

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

Translations: Sprocket
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Dansk (Danish)
n. - kædehjul, tand, tandtromle

Nederlands (Dutch)
tandwiel

Français (French)
n. - (gén) pignon, (Cin) débiteur, dent (d'engrenage)

Deutsch (German)
n. - Zahn

Ελληνική (Greek)
n. - δόντι γραναζιού ή καδένας, τροχός καδένας, αλυσοτροχός, ορθογράναζο

Italiano (Italian)
dente

Português (Portuguese)
n. - haltere (m)

Русский (Russian)
(цепная) звездочка, цепное колесо

Español (Spanish)
n. - rueda dentada, engranaje

Svenska (Swedish)
n. - tand, kugge, kedjekrans, kedjehjul, tandhjul

中文（简体）(Chinese (Simplified))
链轮齿

中文（繁體）(Chinese (Traditional))
n. - 鏈輪齒

한국어 (Korean)
n. - 쐐기꼴 나무, (자전거의 체인이 걸리는) 쇠사슬 기어, 스프로킷(사진기의 필름 감기 레버)

日本語 (Japanese)
n. - 鎖歯車, 鎖歯車の歯, スプロケット

العربيه (Arabic)
‏(الاسم) مفصل, عجله مسننه‏

עברית (Hebrew)
n. - ‮שן (של אופן משונן)‬

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Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Military Dictionary. US Department of Defense Dictionary of Military and Associated Words, 2003.  Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Sprocket".  Read more
Translations. Copyright © 2007, WizCom Technologies Ltd. All rights reserved.  Read more