自行车链条线设计参数

自行车链条线设计参数

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时间:2018-07-24

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1、AllAboutBicycleChainlineChainlineThisreferstohowstraightthechainrunsbetweenthefrontandrearsprockets.Ideally,bothsprocketsshouldbeinthesameplane,sothatthereisnosidewardmotionorstresstothechain.Thisconstitutes"perfectchainline".Inthecaseofderailergearedbicy

2、cles,thechainlineisnotperfectinmostgears.Theworsethechainline,theworsethemechanicalefficientyofthedrivetrain."Correct"chainlineforaderailersystemisamatterofopinion,anddependsontheintendeduseofthebicycle.Therearetwo"simple"answerstothequestionofwhatconstit

3、utesproperchainline:1.Oneviewisthatthemiddleoftheclustershouldlineupwiththemiddlechainring(orhalf-waybetweenthetwo,inthecaseofadouble.2.Fromthepartsmanufacturers'pointofview,thechainlinedependsonthediameteroftheseattubewherethefrontderailermounts.Forfatte

4、rseattubeswherethefrontderailerisfarthertotheright,derailermanufacturerswantthechainlinetobefarthertotherightalso,becausetheirmainpriorityisshiftingperformance,andtheirfrontderailershaveanoptimalchainlinewithrespecttotheedgeoftheseattube.Thisisparticularl

5、yaconcerninthecaseofbicycleswithindexedfrontshifting.Fromtherider'spointofview,chainlineispartlydependentonhowyouaregoingtouseyourgears.Forinstance,consideraroadtriplevsamountainbiketriple:·Witharoadtriple,youmostlyusethetwobiggerrings,thegrannyisonlyocca

6、sionallyused,andonlywiththelargerrearsprockets.Foraroadtriple,havingthecranksclose-inisgood,becauseitincreasestheusabilityofthebigring.·Withamountainbike,thesmallringisusedmuchmoreoften,andmustoftenbeusedwithfairlysmallsprocketstoavoidhavingtoshiftthefron

7、tunderload.Formountainbikes,amoreoutboardchainwheelpositionisoftenpreferable.ChainlineStandards:ApplicationDimensionNotesRoadDouble43.5Shimanospec,measuredtothemidpointbetweentherings.withtypical5mmchainringspacing,thisputstheinnerat41mm,theouterat46mm.Ro

8、adTriple45Shimanospec,measuredtothemiddlering.MTBTriple47.5-50mmShimanospec,measuredtothemiddlering.47.5preferred,butforframeswithoversizedseattubes,thelongerdimensionmaybeneeded,becausethefattubeplacesthederailerme

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