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K6124610204060100200124681020406080100Vmm/spN/mm22StaticloadcapacityThestaticloadcapacityCsisthemaximumstaticloadthatcanbeappliedonthesphericalbushingwithoutbreakinginnerandouterringsorcausinganyperma-nentdeformationsevereenoughtorenderthebush-ingunusable.Itmustbenotedthatifthemagnitudeoftheappliedloadbecomescomparabletothestaticloadcapacityofbushing,thestressesintheshaftorhousingmayalsoreachtotheirlimits.Thispossibilitymustbetakenintoconsiderationinthedesign.EquivalentradialloadSphericalBushingscantakeradialandaxialloadsatthesametime.Whenthemagnitudeanddirectionofloadsareconstant,theequivalentradialloadcanbeobtainedfromthefollowingequation.P=Fr+YFa …………………………………(2)where, P:EquivalentradialloadN FrRadialloadN Fa:AxialloadN Y:Axialloadfactor(RefertoTable11.)Table10TemperaturefactorftTypeofbushingSteel-on-steelMaintenance-freeWithoutsealsWithsealsWithoutsealsWithseals11111-1-1-0.9-1-0.75-1-0.55-0.7---Temperature℃-30+80+80+90+ 90+100+100+120+120+150+150+180Table11AxialloadfactorYFa/FrTypeofbushingSteel-on-steelMaintenance-free112233Unusable45Unusable0.10.20.30.40.5>0.5Beforeattemptingtocalculatethelife,makesurethattheoperatingconditionsarewithinthepermissiblerangebyreferringtothepVdiagraminFig.1.Whentheoperatingconditionsareoutofthepermis-siblerange,pleaseconsultIKO.ThecontactpressurepandtheslidingvelocityVareobtainedfromthefollowingequations.p= 100P……………………………………(3)CdtV=5.82×10-4dkβf ………………………(4)where,p:ContactpressureN/mm2P:EquivalentradialloadN(Refertoequation(2).) Cdt:DynamicloadcapacityconsideringtemperatureincreaseN(Refertoequation(1).) V:Slidingvelocitymm/s dk:Spherediametermm(Refertothedimensiontables.)2β:Oscillatingangledegrees(RefertoFig.2.)whenβ<5°,β=5whenrotating, β=90f:Numberofoscillationsperminutemin-1LifeThelifeofSphericalBushingsisdefinedasthetotalnumberofoscillatingmotionsbeforethebushingscannotbeoperatednormallybecauseofwear,increaseininternalclearance,increaseinslidingtorque,riseofoperatingtemperature,etc.Astheactuallifeisaffectedbymanyfactorssuchasthematerialoftheslidingsurface,themagnitudeanddirectionofload,lubrication,slidingvelocity,etc.,thecalculatedlifecanbeusedasapracticalmeasureofexpectedservicelife.1LifeofSteel-on-steelsphericalbushings[1]ConfirmationofpVvalueFig.1pVdiagramofSteel-on-steelsphericalbushingsFig.2OscillatingangleContactpressureSlidingvelocityWhenalternateloadsareapplied,thisrangeisalsopermissible.PermissiblerangeOscillatingangleEEK
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