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1、ExplanationofNSKnewlifecalculationequation(NSKABLEFORECASTER)introducesFatigueloadlimit(Pu),whichdoesnotcauseflakinglessthanthat,inadditiontotheloadappliedtobearing,Contaminationfactor(ac),whichindicatesthelevelofcontaminationforlubricant,andLifeadjustmentfactor(aNSK),whichiscalculate
2、dbyconsideringviscosityratio()representingtheratiobetweentheviscosityofthelubricantandnecessaryviscositylubricatesbearingnormally.Itisshownasbelow.whereFatiguelife,whichconsidersFatiguelimitloadofbearingmaterial,ContaminationfactorandviscosityoflubricantinadditiontobearingloadHowever,
3、incasethatcalculatedlifeexceeds200000hours,itisindicated"over200000"Basicratinglifewithreliabilityof90%calculatedfromloadconditionReliabilityfactorLifeadjustmentfactorbasedonnewlifetheoryHowever,thisequationcannotapplytofollowingoperatingconditions· Incaseofverylargeloadimposestothebe
4、aring(MorethanCoormorethan50%ofC)· Incaseoflowspeedrotationofthebearing,rotatingspeedislessthan20min-1· Incaseofexceedinglimitingspeed· Incaseofbearingtemperatureexceeding130°C· Incaseofwaterintrudestothebearingorlubricant(Rollneckbearing)· Incasethatthebearingisusedunderhighvibration
5、(Automotiveengineaccessory)· Incasethatthereisalargemisalignmentbetweeninnerandouterrings· Bearingswiththeoccurrenceofabnormalitiessuchaswear,corrosion,orelectricerosion· OperationsunderextremelypoorlubricationorverylightloadsExplanationofaNSKTheaNSKadjustmentfactoroftheNSKlifecalcula
6、tionequationisdefinedasafunctionoftheloadparameterandtheaccontaminationfactor,whichreflectsbothcontaminationlevelsofthelubricant,andincludesthelubricationparameter(viscosityratio).Adiagramusingtheadjustmentfactorisprovidedseparatelyforballbearingsandforrollerbearings.(Diagrambelowisan
7、exampleofadiagramforaballbearing.)Therangeoftheadjustmentfactorisfrom0.1toasmuchas50.Especially,underideallubricatingconditions,themaximumvalue(aNSK = 50)canbeattained.Incontrast,underheavilycontaminatedconditions(ac = 0.05),thenaNSK = 0.1.ISO281:2007Lnm = a1 aISO L10 where,Lnm = ISO2
8、81mod
