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A25EquivalentloadTheloadsappliedtothebearingaredividedintoradi-alloadsthatareappliedperpendiculartothecentralaxisandaxialloadsthatareappliedinparalleltothecentralaxis.Theseloadsactindependentlyorincom-binationwithotherloads.DynamicequivalentloadWhenbothradialloadandaxialloadareappliedtothebearingsimultaneously,thevirtualload,actingonthecenterofthebearing,thatwillgivealifeequaltothatundertheradialloadandtheaxialloadisdefinedasadynamicequivalentload.Inthecaseofneedlerollerbearings,radialbearingsreceiveonlyradialloadsandthrustbearingsreceiveonlyaxialloads.Accordingly,radialloadsaredirectlyusedinthelifecalculationoftheradialbearings,whileaxialloadsaredirectlyusedforthethrustbearings.[Forradialbearings]Pr =Fr ………………………………………(20)[Forthrustbearings]Pa=Fa………………………………………(21)where,Pr:Dynamicequivalentradialload,NPa:Dynamicequivalentaxialload,NFr:Radialload,NFa:Axialload,NStaticequivalentloadWhenbothradialloadandaxialloadareappliedtothebearingsimultaneously,thevirtualload,actingonthecenterofthebearing,thatwillproduceamaxi-mumcontactstressonthecontactsurfacebetweentherollingelementandtheracewayequaltothatgivenbytheradialloadandtheaxialloadisdefinedasastaticequivalentload.Inthecaseofneedlerollerbearings,radialbearingsreceiveonlyradialloadsandthrustbearingsreceiveonlyaxialloads.Accordingly,radialloadsaredirectlyusedfortheradialbearings,whileaxialloadsaredirectlyusedforthethrustbearings.[Forradialbearings]P0r=Fr………………………………………(22)[Forthrustbearings]P0a=Fa………………………………………(23)where,P0r:Staticequivalentradialload,NP0a:Staticequivalentaxialload,NFr:Radialload,NFaAxialload,N
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