>> P.29
usageenvironments•LifeWhilethedefinitionoflifeincludestheratinglifeofficiallyindicatedinJISB1518,nothingelseisuniversallydetermined,anditmaybedefinedinvariouswaysaccordingtotheusageapplicationorindividuallyrequiredperformance(degreeofdeteriorationwithregardtonoise,torque,runout,etc.).Notethatlifeingeneralmayrefertoratinglife(materialfatiguelife),modifiedratinglife,functionallife(performanceconcerningnoise,torque,vibration,etc.),lubricationlifeetc.Operatingenvironment•Temperature,humidity,powder,externalvibration,etc.Decideonthebearingmaterial,retainer,lubricant,etc.basedontheexpectedupperandlowerlimitvaluesoftheoperatingenvironmenttemperatureandhumidity.Decideonwhethertoselectashieldorsealstructurebasedonthepresenceofpowder,andconsiderpreloadaswellaslubricanttypeandamountbasedonexternalvibrationconditions.•OtherspecialenvironmentsForspecialoperatingenvironments,suchasthosewithexposuretospecificchemicalsorgasesortosaltwater,thosewherebearingsmustnotproducepowder,orthosewhereelectricityistobeconductedwithinthebearing,consultMinebeaMitsumi.29
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