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英文原文CarsdrivewiththelatesttechnologyprogressAutomotivetransmissionbeltistheimportantautomotiveengineparts,transmissionbeltisanimportantcomponent.Itcanbesaidthatthetransmissionbeltofmanytechnologicaladvancesandinventions,andiscloselyrelatedtothedevelopmentofautomobileindustry,suchastheVbeltinvention,TrimmingVbelt,Multiwedgebelt.andsynchronousbeltofrapiddevelopment,hydrogenatednitrilerubberHNBRusedinsynchronousbelt,EPDMrubberEPDMappliedMultiwedgebelt,whicharethelatesttechnologyinordertomeetrequirementsoftheautomobileindustrywasdevelopingrapidly.Inrecentyears,duetoglobalwarming,environmentalprotectionandcomfortrequirementsoftheautomotive,energy,emissionsandNVHnoise,vibrationandsmoothisthemaintopicoftheautoindustry.Howtoimprovefuelefficiencyandreduceemissions,improvethemaintenancecyclehasbeenagoaloftheautomobileindustryresearch,includingmultivalvetechnologyMultivalveEngines,MVESandvariableMunVariableValveTiming,VVTtechnology,catalyticconverters,42Vpowergeneration/startermotorintegrationintegratedstarteralternator,ISA,DIdieselenginesand240,000kmor300,000kmmaintenancecycle.Thesetechnologicaladvancesintheautopartsalsoacorrespondingincreaseinperformancerequirementsandharsh,automotivetransmissionbeltisnoexception.Inordertoadapttothesechanges,andsomeforeignfamoustransmissionbeltdrivewiththecarmanufacturersconductedmanyimprovementandperformanceimprovement.ProfileMultiwedgebeltTrimmingtoothprofileMultiwedgebeltsimilartotheVbelt,orinthewedgeprofileofthepiecestoenhancebeltandbeltFlexibleThermalperformancecanbesignificantlyimprovedwithlife.GoodyearstudyshowedthatthesamechloroprenerubberCRmaterialsMultiwedgebelt,hightemperaturefatiguetestordinaryMultiwedgebelt66h,atoothMultiwedgebeltupto167hours.AtoothMultiwedgebeltcanreducetheaccuracyofthebeltassemblyrequirements.ButtoothMultiwedgebeltinusethroughthepulleywillbringoutintotheairflow,flowgeneratedrhythmicsound.GoodyearcompanythroughHelical,ultrahighDAYCOcausingirregularteethcompaniestooffsetsuchvoicescanbereducedbyabout15dBnoiseabout.ThetwocompanieswereGatorharkandPOLYCOGmarkingtomarket.FlockingMultiwedgebeltMultiwedgebeltdrivetransmissionnoiseisoneofdefectslarger,lowspeedorvelocitychangesintheuseofquick,andaftersometime,wedgewear,andthetensionrelaxationsclerosis,oronrainydaysdiptowater,thetransmissionwouldbegivenharshscream,affectingvehicleNVHperformance.Onesolutioniswedgeleft0.11.0mmhighintensityshortfibersuchasaramid,PBOfiber,etc..Becausefiberfrictioncoefficientstability,asoundabsorbingfunction,thereforegreatlyreducedMultiwedgebelttransmissionnoise.FlockingMultiwedgebeltgeneralwithspecialgrindingprocesstoachieve.Lapping,thefirstwedgefastgroundintoabroadwedge,andthenslowwetgrinding,rubberMillSwap,wedgeexposedcertainlengthofthefiber.FlexibilityMultiwedgebeltInrecentyears,smallfamilycarinordertosimplifytheenginefrontwheeldriveannexstructureshavebeguntouseflexibleMultiwedgebeltsdrivenbybelt.FlexibilityMultiwedgebeltgeneraluseelongationatbreakthan20percentofhightwistnylonfiberasastronglayercord.Ultrahigh,themainlandCONTITECHproductionofautomotiveflexibleMultiwedgebeltallegedlylifehasreached150,000km.EPDMMultiwedgebeltInrecentyears,theengineroomtemperaturegettinghigherandhigher,andsomerequirerubberpiecescapabilityof150°C,andinstantlythecapability170℃,thetraditionalchloroprenerubberCRobviouslynotrequest.AsHNBRtooexpensive,peopleinthestudyfoundthatasmallamountofengineoilisnotonthefrontofthebelt,causingdamage,canusethecheapergoodthermalstabilityofEPDMrubberEPDMrubberasMultiwedgebeltmainmaterial.ButEPDMwearresistance,hightemperatureandthedynamicperformanceofslittingresistantunsatisfactory,pooradhesionwithothermaterials,theseallrequiremodificationsuchasaddingorZDMAandZDAandothermaterialsusedtosolvetheproblem.EPDMMultiwedgebelthightemperatureperformanceandhightemperaturefatiguelifemarkedlyimproved,suchasCRMultiwedgebelt107°Cunderthefatiguelifeofonly50hours,andEPDMMultiwedgebeltat121°Cunderthefatiguelifeofupto125hours.ThedevelopmentoftheEPDMMultiwedgebeltlifehasreached240000Km.ShortfiberreinforcedbeltSince1975HNBRannouncementofthefirstpatents,HNBRisbecomingtodaysworldcarproductionpreferredstandardsynchronousbeltelastomermaterial.JapanHONDAcompaniesin1985thefirstproductionofHNBRequippedwithasubstratefortheproductionofanewtypeofautomobiletransmissionbelt.GermanyBWMhadalsoadoptedin1997bytheJapaneseimportsintoEuropeHNBRsynchronousbeltandthefirstDecorationHNBRsynchronousbeltwiththecarmanufacturers.Inthelate1990s,therapiddevelopmentoftheworldautomobileindustry,theintensemarketcompetition,automobilemanufacturersmainlandcompaniesHNBR/ZMAandshortfiberwithKevlarmanufacturingHSNPOWERlifeHNBRsynchronousbeltuseinthegasolineengine,theirlifeexpectancyhasmorethan240,000km,withclosetotheenginewithlife.Havetriedeverymeanstomaximizeextendedthroughcamshaftdrivebelttoimprovethelifeofthecarsengineperformance,atpresent,almostalloftheworldsautomanufacturershavebroughtaboutthroughtheintroductionofautoHNBRsynchronizationofproductquality.Practiceshowsthat,ingeneraldrivingconditionsHNBRsynchronousbeltofworkinglifeupto100000150000km.ModerncarsonthesynchronousbeltrequirementisLifeof250000300000kmusetemperature35150,instantaneoustemperaturecanreach175oilresistanceof≥CR150℃stepdownupto3000hlife,butalsoinenhancingoilresistanceitsperformanceatlowtemperaturewithoutsacrificingperformance,withteethdynamicstoragemodulusof≥1.4MPa.Toachievesuchahigh,andonlytheuseofperoxidecuringHNBR/zincmethacrylateZMAcomplexesandaramidshortfiberreinforcedcompositematerials.MainlandcompaniesHNBR/ZMAandshortfiberwithKevlarmanufacturingHSNPOWERlifeHNBRsynchronousbeltuseinthegasolineengine,theirlifeexpectancyhasmorethan240,000km,andhasbeenclosetotheenginewithlife.AclothbeltbackAutomobilemanufacturingprocesssynchronousbeltduetotherestrictions,withthebackaregenerallypurerubber,asitisusedintheautomotivebeltbackatthesametimeleadtoothercomponentssuchaspumpsandtensioninstitutions,inparticulartheDIdieselengines.Requiresalotoftension,sowearonthebackofverylarge,purerubberunabletomeettherequirement.Iftheresultwillbringbackacloth,canbegreatlyenhancedwiththebackwearability.IfthemainlandsContiDieselRunnerissuchasynchronousbeltstructure.OilresistancesynchronousbeltSincethe1960s,theUnitedStatesGMwillbethefirsttimethesynchronousbeltforthenewroofstandardcamOHCenginereplacementoftheoriginaluseofballchain,asynchronousbeltasagoodperformance,noise,withoutlubrication,lightweightlowcostandeasymaintenance,andmanyotheradvantages,inthecarsenginepromptlywhenthedriveisused,particularlysmalldisplacementengines,accountingforalmostonehundredpercent.Butthenewcentury,asmoderncarenginestrengthenthecontinuousimprovementofthedegree,plusstrictemissionsregulationsconstantly,constantlyextendedmaintenancecycle240000kmor300000km,whenthedriveisincreasingtheloadontheallocationofgasisaccuracythereareincreasinglyhighrequirements,synchronousbelthasbeenincreasinglydifficulttomeetthemoderncarengineharshdemands,coupledwiththeimprovementoftechnologyarechainsuchasstrength,wearresistance,noisereductionandoptimizationofdesign,chainthemselvestoovercometheshortcomingshighlightedHighpowertransmissionchain,theneedtosafeguardandheatresistance,oilresistance,andotherinherentadvantages,inrecentyearswhenthecarengineisatransmissionmechanismtendtousechaintrend.Inordertocompetewiththechain,thedrivebeltinrecentyearsforeign
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