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1、cvt-無級變速箱知識（Knowledgeofcvt-continuouslyvariabletransmission）Automatictransmissiontechnologyiswidelyusedinautomobilesisthehydraulictorqueconverterandplanetarygeartrainofautomatictransmissiontechnologyportfolio,theaverageloadinginthemaincarmanufacturers
2、inthecitycaroftheratehasreached70%.Butthecombinationofhydraulictorqueconverterandplanetarygearsystemhasobviousdisadvantages:thetransmissionratioisnotcontinuous,canrealizesteplessspeedsegmentedrange;hydraulictransmissionefficiencyislow,theeffectofecono
3、micpowerperformanceandthefuelvehicle;increasetransmissiongearnumbertoexpandthecoverageofCVT,itmustusingmulticomponentstocontrolthepowerofplanetarygeartraintransmissionline,resultinginanumberofautomatictransmissioncomponents,complicatedstructure,inconv
4、enientmaintenanceandmaintenance.Sotheautomotiveindustryhasbeguntostudyothernewvariablespeedtechnology,CVT(CVT)technologyisoneofthemostpromising.CVT(ContinuouslyVariableTransmission)technologyissteplessspeedchangetechnology,usingtransmissionbeltandvari
5、ableworkingdiameterofthemainanddrivenwheeltotransferpower.DuetothecontinuouschangeofCVTcanrealizethetransmissionratio,inordertogettheoptimalmatchingoftransmissionandenginecondition,improvevehiclefueleconomyandpower,improvethedriver'smanipulationofthec
6、onvenienceandcomfortofcrew,soitistheidealvehicletransmission.DevelopmentofCVTTechnologyThedevelopmentofCVTtechnologyhasahistoryofmorethan100years.GermanBenzCorpistheoriginatorofCVTtechnologyusedinautomobiles.Asearlyas1886,VrubberbelttypeCVTwasinstalle
7、donthegasolineenginecarsproducedbythecompany.In1958,H.VanDAFDoorneofHollanddevelopedadoubleVrubberbeltCVTcalledVariomatic,whichwasequippedwiththeDaffodilcarmadebyDAF,andsoldmorethan1millioncars.ButbecauseofthedefectsinaseriesofCVTtyperubberbelt:PowerC
8、o.(torqueislimitedtolessthan135Nm),theclutchisnotstable,theenergylossofhydraulicpump,atransmissionbeltandaclampingmechanismislarger,andithasnotbeengenerallyacceptedinautomotiveindustry.However,researchonimprovingthetransmissionperformanceandth
