JASOT20385

JAPANESEAUTOMOBILESTANDARDJASOT203-85LightAlloyWheelsforMotorcycles1.Scope3.TypesThisStandardspecifieslightalloywheelsformotor-cycles(includingmotorcyclesequippedwithsidecarsandmotordrivencycles)(hereinafterreferredtoaslightalloywheels).Remark:Inthisstandard,unitsandnumericalvaluesarebasedonSI(InternationalSystemofUnits),whileunitsandnumericalvaluesgivenin{}arecustomaryunitssystem,andaregivenforreference.Thetypesofthelightalloywheelsshallbeasfollows:Lightalloywheelsofwhichtherimsandspokes(ordiscs)aremoldedinsingleunits.Lightalloywheelsofwhichtherimsaremadeoflightalloy,andthespokes(ordiscs)oflightalloyorsteel;whicharethenassembled.Wire(1)Unitconstructiontype(2)Compositeconstructiontypespoketypeshall,however,beexcluded.2.PurposeThisstandardaimstoestablishandstandardizethequalityoflightalloywheelsinordertoensuredriving4.NomenclatureofEachPartsafety.ThenomenclatureofeachpartshallbepursuanttoFig.1(shownasanexample).ApplicableStandards:JASOC603-80JISD4203JISD4215JISH0321JISH0522JISH4000JISH4100JISH4140JISH4201JISH4204JISH5202JISH5203JISH5302JISH5303JISZ2343SteelDiscWheelsforAutomobilesDimensionsofTiresforMotorcyclesandScootersRimsforMotorcyclesandScootersGeneralRulesforInspectionofNonferrousMetalMaterialsMethodsofRadiographicTestandClassificationofRadiographsforAluminiumCastingsAluminiumandAluminiumAlloySheetsandPlates,StripandCoiledSheetsAluminiumandAluminiumAlloyExtrudedShapesAluminiumandAluminiumAlloyForgingsMagnesiumAlloySheetandPlateMagnesiumAlloyExtrudedShapesAluminiumAlloyCastingsMagnesiumAlloyCastingsAluminiumAlloyDieCastingsMagnesiumAlloyDieCastingsMethodsforLiquidPenetrantTestingandClassificationofIndication1JAS0T203-85Fig.1UnitConstructionType2wCompositeConstructionTypeofeachpartRimdiameterValveholeJAS0T203-85Lateraldeflection1.oI5.Performance1.25.1DurabilityAgainstBendingMomentAfterbeingsubjectedtoatleastIO5cyclesofthetestaccordingto11.1,thereshallbenoevidenceofharmfulcracks,significantdeformationoranyabnor-malloosenessatjoints.5.2DurabilityAgainstRadialLoadAfterbeingsubjectedtoatleast5x10’cyclesofthetestspecifiedin11.2,thereshallbenoevidenceofharmfulcracks,significantdeformationoranyabnor-malloosenessatjointsofthelightalloywheel.5.3.ImpactResistanceAfterbeingsubjectedtotheimpacttestin11.3,thereshallbenoevidenceofharmfulcracks,significantdeformation,anyabnormalloosenessatjoints,oranysuddenairleakage(l).Note:(I)Suddenairleakageshallmeanthecasewhenthecasewhenthetirepressuredropsbymorethan50%inlessthan30sec.5.4DurabilityAgainstTortionalMomentAfterbeingsubjectedtoatleast10’cyclesofthetestaccordingto11.4,thereshallbenoevidenceofharm-fulcracks,significantdeformationoranyabnormalloosenessatjoints.5.5AirtightnessofRimsRegardinglightalloywheelsfortubelesstires,pres-surizedairsuppliedbythemethoddescribedin11.5shallnotleakoutthroughtherim.6.Dimensions6.1ProfilesofRimsThedimensionsoftheprofilesoftherimsshallbepursuanttoJISD4215(RimsforMotorcyclesandScooters).6.2CircumferenceofRimBeadSeatsThecircumferentialdimensionsoftherimbeadseatsshallbepursuanttoJISD4215.6.3DeflectionsThemaximumvaluesofverticalandlateraldeflectionsshallbeasshowninTable.TableUnit:mmCompositeUnit7.Appearance(1)Thereshallbenocracks,pinholes,shrinkagecavities,scratches,etc.whichmaydevelopintoharmfuldefectsintermsofstrength.(2)Thetiremountingsurfaceandthecircum-ferenceofthevalveholeoftherimshallnothavesuchshapesandsurfaceconditionsaswillharmthefunctionsofthetire,tube,andvalve.(3)Lightalloywheelsfortubelesstiresshallnothaveanydefects,suchaspinholes,whichareharmfulforairtightnessoftherims.8.MaterialsThematerialsofthelightalloywheelsshallbe,inprinciple,pursuanttothefollowingstandards,andincasesofthosemadeofmagnesiumalloy,rustproof-ingshallalsobeappliedtothesurfaces:JISH4000(AluminiumandAluminiumAlloySheetsandPlates,StripandCoiledSheets)orequivalentsJISH4100(AluminiumandAluminiumAlloyExtrudedShapes)orequivalentsJISH4140(AluminiumandAluminiumAlloyForgings)orequivalentsJISH4201(MagnesiumAlloySheetandPlate)orequivalentsJISH4204(MagnesiumAlloyExtrudedShapes)orequivalentsJISH5202(AluminiumAlloyCastings)orequi-valentsJISH5203(MagnesiumAlloyCastings)orequi-valentsJISH5302(AluminiumAlloyDieCastings)orequivalentsJISH5303(MagnesiumAlloyDieCastings)orequivaletns9.HeatTreatmentHeattreatmentshallbepursuanttothestandardsformaterialsprescribedin8.3JAS0T203-85IO.MechanicalPropertiesMechanicalpropertiesshallbepursuanttothestand-ardsformaterialsprescribedin8.11.1.3TestConditionsThebendingmomenttobeappliedin11.1.2shallbedeterminedbythefollowingequation:M=SmxpxWxrSm:Coefficient0.7p:Frictioncoefficientbetweentireandroad0.7W:Themaximumdesignloadofanymotorcycletirewhichcanbeappliedtothelightalloywheelsconcerned(pur-suanttoJISD4203,etc.).Incaseofensuringloadsforaspecifictire,Wshallbethemaximumdesignloadofthattire.However,inthecasewhenthewheelisrestrictedtolimitedvehicle(hereafterreferredtoaslimiteduse),themaximumvalueofthestaticwheelreactionforceofthatvehicleshallbeapplicable.N(kgf)i-:Incaseofapplyingthemaximumvalueofthemaximumdesignloadofthetireformotorcycles,thestaticloaded