>> P.458
K9■OperatingTemperatureRangeTheoperatingtemperaturerangeforSphericalBushingswithsealsis-30゜C〜+80゜C.ThemaximumallowabletemperatureforSphericalBushingswithoutsealsis+180゜Cforthesteel-on-steeltypeand+150゜Cforthemaintenance-freetype.■PrecautionsforUseDesignofshaftWhentheloadislarge,slidingmayoccurbetweentheshaftandtheinnerringboreofbushing.Forsuchcases,itisnecessarytopreparetheshaftwithahard-nessof58HRCorgreaterandsurfaceroughnessof0.8μmRaorless.Furthermore,attentionmustbepaidtothestrengthofshaftbecausetheshearand/orbendingstressesintheshaftmaysurpasstheallowablevaluesevenwhentheloadisbelowthestaticloadcapacityofSphericalBushings.DesignofhousingThehousingshouldhavesufficientrigiditytoavoidharmfuldeformationunderload.WhenthehousingshowninFig.6isused,itshouldbedesignedwithsufficientstrengthasfollows.Fig.6ShapeofhousingFig.7Stressconcentrationfactor1WhentheloadactsintheYLdirection;Selectthehousingmaterialconsideringthecompres-sivestressobtainedfromthefollowingequation. σ1=F……………………………………(9)CDwhere, σ1: Maximumcompressivestressoccur-ringinthehousingboreN/mm2F:AppliedloadNC:WidthofouterringandhousingmmD:Outsidediameterofouterringmm2WhentheloadactsintheYudirection;Selectthehousingmaterialconsideringthetensilestressobtainedfromthefollowingequation.σ2=F k………………………(10)C(DH-D)where, σ2: MaximumtensilestressoccurringinthehousingboreN/mm2F:AppliedloadNC:WidthofouterringandhousingmmDH:OutsidediameterofhousingmmD:Outsidediameterofouterringmmk:Stressconcentrationfactor(RefertoFig.7.)StressconcentrationfactorDCFFDHYUYL10234567891023456789DDH/k
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