idler pulley

idler pulley
[1] The pulley in a rear derailleur that stays farthest from the freewheelcogs and functions to keep tension on the chain of a bicycle.
[2] A small pulley located about half way from the front to back of a long chain such as found on a tandem bicycle.
[3] A spring-loaded pulley designed to maintain the tension of the timing belt or a cam chain.

Dictionary of automotive terms. 2015.

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  • idler pulley — noun a pulley on a shaft that presses against a guide belt to guide or tighten it • Syn: ↑idle pulley, ↑idle wheel • Hypernyms: ↑pulley, ↑pulley block, ↑pulley block, ↑block * * * noun …   Useful english dictionary

  • idler pulley — noun Date: circa 1890 a guide or tightening pulley for a belt or chain …   New Collegiate Dictionary

  • idler pulley — /ˈaɪdlə pʊli/ (say uydluh poolee) noun a loose pulley made to press or rest on a belt in order to tighten or guide it …  

  • idler — [īd′lər, īd′ l ər] n. 1. a person who wastes time and does no work; lazy person 2. a gear placed between two others to transfer motion from one to the other without changing their direction or speed: also idler gear or wheel or idle wheel 3. a… …   English World dictionary

  • pulley — [1] A grooved wheel carrying a string, rope, chain, or belt which turns the wheel. [2] Flat wheel with a V groove. When attached to a drive and drive members, the pulley provides a means for driving the compressor. See camshaft pulley crankshaft… …   Dictionary of automotive terms

  • Idler — An idler is a mechanical device such as an idler pulley or idler wheel that is secondary to the main transfer of power in a mechanical system. See also * Gear ratio * The Idler magazines and an essay collection entitled The Idler * …   Wikipedia

  • pulley block — noun a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope • Syn: ↑pulley, ↑pulley block, ↑block • Hypernyms: ↑machine, ↑simple machine •… …   Useful english dictionary

  • pulley-block — noun a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope • Syn: ↑pulley, ↑pulley block, ↑block • Hypernyms: ↑machine, ↑simple machine •… …   Useful english dictionary

  • idler wheel — noun also idle wheel : a wheel or roller used to transfer motion or to guide or support something: as a. : idler gear b. : idler pulley c. : a rubber surfa …   Useful english dictionary

  • idler wheel — noun Date: 1929 1. a wheel, gear, or roller used to transfer motion or to guide or support something 2. idler pulley …   New Collegiate Dictionary

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