>> P.454
TherecommendedfitsforSphericalBushingsareshowninTables7and8.Table7RecommendedfitsforSteel-on-steelSphericalBushingsToleranceclassShafth6,j6m6,n6HousingboreH7,J7M7,N7ConditionNormaloperationWithdirectionallyindeterminateloadRemarkN7toleranceisrecommendedforlightmetalhousings.Table8RecommendedfitsforMaintenance-freeSphericalBushingsToleranceclassofshafth6,j6ToleranceclassofhousingboreH7,J7,K7RemarkK7toleranceisrecommendedforlightmetalhousings.■SelectionofSphericalBushingsthesteel-on-steelSelectionbetweenthemaintenance-freetypeismadeconsideringtheoper-atingconditionssuchastempera-ture,andslidingvelocity.lubrication,typeandload,Loadcapacity1DynamicloadcapacityThedynamicloadcapacityCdisthemaximumallow-ableloadthatcanbeappliedonasphericalbushingunderoscillatingmotion.Itisobtainedonthebasisofthecontactpressureonthesphericalsurfaces.Thedynamicloadcapacityisalsousedforcalculatingthelifeofsphericalbushings.TherecommendedvalueofbushingloadisobtainedloadcapacityCdbyabymultiplyingnumericalthebushingtypeandtheloadcondition.AguidelineforselectionisshowninTable9.factor,whichdiffersdependingonthedynamicTable9GuidefordeterminationofloadTypeofbushingSteel-on-steelMaintenance-freeLoaddirectionConstant≦0.3Cd≦CdAlternate≦0.6Cd≦0.5CdWhenthemagnitudeofloadexceedsthevaluegiveninTable9,pleaseconsultIKO.Thedynamicenceofbushingthefollowingequationusingthetemperaturefactor.thetemperaturecanbeobtainedloadcapacityCdtconsideringinflu-fromCdt=ftCd ……………………………………(1)where, Cdt:DynamicloadcapacityconsideringtemperatureincreaseN ft:Temperaturefactor(RefertoTable10.) Cd:DynamicloadcapacityN(Refertothedimensiontables.)dNominalboredia.mmGE…EGE…ESGE…GGE…GSRadialinternalclearanceMin.Max.3240506072856882100120142165100192110214---681012151720253035404550607080901001101201401601802002202402602804568101215172025303540455060708090100110120140160180200220240260280300RemarkAlsoapplicabletobushingswithseals.Table6RadialinternalclearanceofGE…ECtype(Maintenance-free)unit:μmdNominalboredia.mm1517202530354045506070RadialinternalclearanceMin.Max.000040506072RemarkAlsoapplicabletobushingswithseals.K5Table5RadialinternalclearanceofGEtype(Steel-on-steel)unit:μm■Fit
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