>> P.44
Selectionoffitthinhousingorahollowshaftisused,theWhenselectingasuitablefit,inadditiontothevariousconditionsmentionedabove,itisnecessarytodrawonexperienceandpracticalresults.Tables21and22showthemostgeneralfitdata.Whenainterferenceismadelargerthananordinaryfit.ThefitbetweenneedlerollerbearingswithoutinnerringandshaftsisbasedonTable23.ForthefitbetweenShellTypeNeedleRollerBearingsandhousingbores,seepageB5.ForthefitbetweeninnerringsforShellTypeNeedleRollerBearingsandshafts,seeTable22.Table21Fitbetweenneedlerollerbearingsandhousingbores(NotapplicabletoShellTypeNeedleRollerBearings)OperatingconditionsToleranceclassofhousingbore(1)Applicationexamples(Reference)loadonthinhousing,HeavyshockloadlargeP7(2)FlywheelsloadonRotatingouterringHeavyload,normalloadN7(2)Wheelbosses,transmissiongearsrectionalDilyindeterminateloadLightload,fluctuatingloadLargeshockloadHeavyload,normalloadNormalload,lightloadShockload,heavyloadStationaryonouterringloadNormalload,lightloadWithheatconductionthroughshaftload,normalLightrotationandhighrigidityload,requirementsofhigh-precisionM7M7K7J7J7H7G7K6Pulleys,tensionpulleysEccentricwheels,pumpsCompressorsCrankshafts,compressorsGeneralbearingapplications,gearshaftsGeneralbearingapplicationsPaperdryersMainspindlesofmachinetoolsNotes(1)Thistableappliestosteelorcastironhousings.Forlightermetal,atighterfitshouldbeselected.Forsplithousings,donotuseafittighterthanJ7.(2)Careshouldbetakensothattheradialinternalclearanceisnottoosmall.dynamicequivalentradialloadandCisthebasicdynamicloadratingofthebearingtobeused.RemarkLightload,normalloadandheavyloadrepresentP≦0.06C,0.06C<P≦0.12C,and0.12C<P,respectively,wherePistheA41
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