>> P.52
1-4BearingSelection(9)InternalclearanceBearinginternalclearanceissignificantlyaffectedbyperformanceincludinglife,vibration,noise,heatgeneration,etc.Itisimportanttoselectinternalclearanceappropriatelysuitedtotheapplication.Normally,theradialinternalclearanceissetatthevalueinthestandards.Thisvalueissetinthetablesbelow,undertheNMBandJISpartnumbers.Whenthebearingisinterferencefitted,leavinginterferencewiththeshaftorhousing,theinternalclearancedecreases.Astheinternalclearancechangesdependingonthefitconditionsandtemperatureenvironment,considertheoperatingconditionsandenvironmentwhenselectingtheinternalclearance.θ2InternalclearanceTypesofinternalclearanceincluderadialinternalclearance,axialinternalclearance,andinclinationangularclearance.•Radialinternalclearance(Gr)Travelamountwhentheouterringisalternatelymovedintheradialdirection,withtheinnerringfixed(Fig.9-1)•Axialinternalclearance(Ga)Travelamountwhentheinnerringisalternatelymovedintheaxialdirection,withtheouterringfixed(Fig.9-2)•Inclinationangularclearance(θ)Travelamountoftheangulardirectionwhentheinnerringistiltedintheaxialdirection,withtheouterringfixed(Fig.9-3)LoadLoadGrFig.9-1Ga2Fig.9-2Fig.9-3Radialinternalclearance(Gr)Axialinternalclearance(Ga)Inclinationangularclearance(θ)NMBpartnumberradialinternalclearanceJISpartnumberradialinternalclearanceInternalclearancesymbolInternalclearanceamount(μm)P13P24P25(standard)P582.5~7.55.0~10.05.0~12.512.5~20.0InternalclearancesymbolInternalclearanceamount(μm)M2M3(standard)M4M5M6M93.0~8.05.0~10.08.0~13.013.0~20.020.0~28.027.0~32.052
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