米其林低滚动阻力轮胎技术

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1、RollingResistanceBasicFoundationRandallCLARKRollingResistanceBasicFoundation•DefinitionandOrigins•Relativemagnitude–Cars–Trucks–Buses•ExternalVariablesWhatisRollingResistanceRollingResistance•FRR-TiredragonvehiclemontionHowcanyoufellRollingResistance?•Ifyourideabicyclewithtire

2、satlowpressure,youhavetoworkhardertoovercometheincreasedrollingresistance.SoisitEnergyorForce?Both!•RollingResistence–=tirerollingenergyconsumedperunitdistance–=work/distance–=[Newstonsxmeters]/msters•RollingResistance–=resistanceforceofthetires–=force–=NewtonsWhatcausesRollin

3、gResistance?•ThemainthreephysicalcausesofrollingresistanceWhereismostoftheenergyconsumedinthetire?•ComputerModelingofEnergyLossTheRoleofRubberCompounds•Positive:providegrip,resilience,toughness,wear•Negative:wasteheatgeneratedwhentireflexes;lostenergycomesformfueltankChoosingR

4、ubberCompounds•Therearerubbercompoundsthatcanredecerollingresistance•Thechoicedependsonmanydesignrequirements:–wear;grip;cutresistance….•SomenewhightechcompoundscanreducerollingresistancewithfewcompromisesTreadPatternEffectsexamples:trucktiresLowerRollingResistanceHigherRollin

5、gResistanceSmoothribtireslugtiresChoiceofRubberCompounds&TreadPatternsaffectRollingResistance&HeatGenerationTrucktireimagestakenwithinfraredcamerawhiletirerolling;bothtiresrunningunderidenticalloadandpressureComparinglowrollingresistancetohighrollingresistance•Youcanseethediff

6、erenceintreadpatternandcompoundByplacingdifferentbrands/typesoftiresonsimilarpositionsonthevehicle,youcanseetheheatandthereforeRRdifferencesbyusinganinfraredcameraatnight…Coolertireshaveotherbenefits,also•Trucktires:tirecarcasslastslongerforpotentialretreading–Betteruseofreour

7、ces•Cartires:coolertiresreducechanceoffailurewhilerunning–safetyDosesthetirestructureplayarole?Yes!RadialtiresarebetterTheBias-plyTire•Acasingmadeofseveralpliespositionedinacriss-crossmannerThebias-plytireHIGHFRICTION=HIGHROLLINGRESISTANCEBiastire:Crownandsidewallsinterdepende

8、nt•Sidewallflesingistransmittedtothetreadresultingin:–Distort