>> P.44
A41SelectionoffitWhenselectingasuitablefit,inadditiontothevariousconditionsmentionedabove,itisnecessarytodrawonexperienceandpracticalresults.Tables21and22showthemostgeneralfitdata.Whenathinhousingorahollowshaftisused,theinterferenceismadelargerthananordinaryfit.ThefitbetweenneedlerollerbearingswithoutinnerringandshaftsisbasedonTable23.ForthefitbetweenShellTypeNeedleRollerBearingsandhousingbores,seepageB5.ForthefitbetweeninnerringsforShellTypeNeedleRollerBearingsandshafts,seeTable22.Table21Fitbetweenneedlerollerbearingsandhousingbores(NotapplicabletoShellTypeNeedleRollerBearings)OperatingconditionsToleranceclassofhousingbore(1)Applicationexamples(Reference)RotatingloadonouterringDirectionallyindeterminateloadStationaryloadonouterringLightload,normalload,requirementsofhigh-precisionrotationandhighrigidityHeavyloadonthinhousing,largeshockloadHeavyload,normalloadLightload,fluctuatingloadLargeshockloadHeavyload,normalloadNormalload,lightloadShockload,heavyloadNormalload,lightloadWithheatconductionthroughshaftP7(2)N7(2)M7M7K7J7J7H7G7K6FlywheelsWheelbosses,transmissiongearsPulleys,tensionpulleysEccentricwheels,pumpsCompressorsCrankshafts,compressorsGeneralbearingapplications,gearshaftsGeneralbearingapplicationsPaperdryersMainspindlesofmachinetoolsNotes(1)Thistableappliestosteelorcastironhousings.Forlightermetal,atighterfitshouldbeselected.Forsplithousings,donotuseafittighterthanJ7.(2)Careshouldbetakensothattheradialinternalclearanceisnottoosmall.RemarkLightload,normalloadandheavyloadrepresentP≦0.06C,0.06C<P≦0.12C,and0.12C<P,respectively,wherePisthedynamicequivalentradialloadandCisthebasicdynamicloadratingofthebearingtobeused.
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