资源描述：
《自行车链条线设计参数》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
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
