>> P.21
A18OperatingconditionsOccasionalorshorttermusage・Powertools・Agriculturalmachines・Constructionmachinery・Conveyors・Elevators・Rollneckofrollingmills・Smallmotors・Deckcranes・Generalcargocranes・Passengercars・Factorymotors・Machinetools・Generalgearunits・Printingmachines・Cranesheaves・Compressors・ImportantgearunitsInfrequentusagebutrequiringreliableoperationIntermittentoperationbutforcomparativelylongperiods・Escalators・Centrifugalseparators・Blowers・Woodworkingmachines・Plasticextrudingmachines・PapermakingmachinesOperatedinexcessof8hoursperdayorcontinuouslyforanextendedtime・Watersupplyequipment・PowerstationequipmentContinuoususefor24hoursandaccidentalstopsnotallowedMachineandlifefactorfh〜32〜43〜54〜76〜BearinglifefactorsforvariousmachinesTherequiredlifeofthebearingmustbedeterminedaccordingtothemachineinwhichthebearingistobeusedandtheoperatingconditions.Table1showsreferencevaluesoflifefactorsforselectingabearingforeachmachine.Table1LifefactorofbearingsfhforvariousmachinesFig.2ScalesforratinglifecalculationRotationalspeedVelciyfactorBasicratingliferepresentedbyservicehoursLiefactorRotationalspeedVelciyfactorBasicratingliferepresentedbyservicehoursLiefactorRollerbearings10200100010000800001001000100001.440.761.02.03.04.04.61.00.201520300400500600700800900200030004000600080002000040000600003040608015020030040060080015002000300040006000800015000200003000040000600001.41.30.800.850.900.951.11.21.31.41.51.61.71.81.92.53.54.51.21.10.90.80.70.60.50.40.30.280.240.220.180.160.140.120.106min-1nfnhLhfh10200100010000800001001000100001.490.741.02.03.04.05.05.41.00.200.10152030040050060070080090020003000400060008000200004000030000600003040608015020030040060080015002000300040006000800015000200003000040000600001.41.30.800.901.11.21.31.41.51.61.71.81.92.53.54.51.21.10.90.80.70.60.50.40.30.280.240.220.180.160.140.120.090.082min-1nfnhLhfhBallbearingsABCDEFGHIJKLM
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