>> P.21
ABCDEFGHIJKLMRollerbearings10001502003004006008001500200030004000600080001500020000300004000060000100000.2010152030406010080Ballbearings10001000015020030040060080015002000300040006000800015000200003000040000600001.31.21.11.00.90.80.70.60.50.40.30.280.240.223004005006007008001000900200030004000600080000.20100000.180.160.140.120.090.100.08220000300004000060000800000.800.901.01.11.21.31.41.51.61.71.81.92.02.53.03.54.54.05.05.4Fig.2Scalesforratinglifecalculation101520304060100801.31.21.11.00.90.80.70.60.50.40.30.280.240.220.180.160.140.120.10630040050060070080010009002000300040006000100008000200004000080000600000.850.900.951.01.11.21.31.41.51.61.71.81.92.02.53.03.54.04.54.61.41.44200hfh0.760.80hLmin-1nfn1.41.49200hfh0.74hLmin-1nfnRotationalspeedVelciyfactorBasicratingliferepresentedbyservicehoursLiefactorRotationalspeedVelciyfactorBasicratingliferepresentedbyservicehoursLiefactorBearinglifefactorsforvariousmachineslifeofTherequiredthebearingmustbedeterminedaccordingtothemachineinwhichthebearingistobeusedandtheoperatingconditions.Table1showsreferencevaluesofselectingabearingforeachmachine.factorslifeforTable1LifefactorofbearingsfhforvariousmachinesOperatingconditions〜32〜43〜54〜76〜MachineandlifefactorfhOccasionalorshorttermusage・Powertools・AgriculturalmachinesInfrequentusagebutrequiringreliableoperationIntermittentoperationbutforcomparativelylongperiods・RollneckofrollingmillsOperatedinexcessof8hoursperdayorcontinuouslyforanextendedtimeContinuoususefor24hoursandaccidentalstopsnotallowed・Constructionmachinery・Smallmotors・Deckcranes・Generalcargocranes・Passengercars・Escalators・Conveyors・Elevators・Factorymotors・Machinetools・Generalgearunits・Printingmachines・Centrifugalseparators・Blowers・Woodworkingmachines・Plasticextrudingmachines・Cranesheaves・Compressors・Importantgearunits・Papermakingmachines・Watersupplyequipment・PowerstationequipmentA18
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