>> P.455
KBeforeattemptingtocalculatethelife,makesurethattheoperatingconditionsarewithinthepermissiblerangebyreferringtothepVdiagraminFig.1.Whentheoperatingconditionsareoutofthepermis-siblerange,pleaseconsultIKO.ThecontactpressurepandtheslidingvelocityVareobtainedfromthefollowingequations.……………………………………(3)V=5.82×10-4dkβf ………………………(4)where,p:ContactpressureN/mm2P:EquivalentradialloadN(Refertoequation(2).) Cdt:DynamicloadcapacityconsideringtemperatureincreaseNp= 100PCdt(Refertoequation(1).) V:Slidingvelocitymm/s dk:Spherediametermm(Refertothedimensiontables.)2β:Oscillatingangledegrees(RefertoFig.2.)whenβ<5°,β=5whenrotating, β=90f:Numberofoscillationsperminutemin-1Whenalternateloadsareapplied,thisrangeisalsopermissible.Permissiblerange100806040206810421N/mm2pContactpressure124610204060100200SlidingvelocityVmm/sFig.1pVdiagramofSteel-on-steelsphericalbushingsEEOscillatingangleFig.2OscillatingangleK6Typeofbushing-30+80+80+90+ 90+100+100+120+120+150+150+1800.7---1-1-1-0.90.750.55---1-1-Steel-on-steelMaintenance-freeWithoutsealsWithsealsWithoutsealsWithseals1111Table10TemperaturefactorftTemperature℃2StaticloadcapacityThestaticloadcapacityCsisthemaximumstaticloadthatcanbeappliedonthesphericalbushingwithoutbreakinginnerandouterringsorcausinganyperma-nentdeformationsevereenoughtorenderthebush-ingunusable.Itmustbenotedthatifthemagnitudeoftheappliedloadbecomescomparabletothestaticloadcapacityofbushing,thestressesintheshaftorhousingmayalsoreachThispossibilitymustbetakenintoconsiderationinthedesign.limits.theirtoEquivalentradialloadSphericalBushingscantakeradialandaxialloadsatthesametime.Whenthemagnitudeanddirectionofloadsareconstant,theequivalentradialloadcanbeobtainedfromthefollowingequation.P=Fr+YFa …………………………………(2)where, P:EquivalentradialloadN Fr:RadialloadN Fa:AxialloadN Y:Axialloadfactor(RefertoTable11.)Table11AxialloadfactorY45UnusableUnusable332211Fa/Fr0.10.20.30.40.5>0.5TypeofbushingSteel-on-steelMaintenance-freeLifeinincreaseinternalclearance,ThelifeofSphericalBushingsisdefinedasthetotalnumberofoscillatingmotionsbeforethebushingscannotbeoperatednormallybecauseofwear,increaseinslidingtorque,riseofoperatingtemperature,etc.Astheactuallifeisaffectedbymanyfactorssuchasthematerialoftheslidingsurface,themagnitudeanddirectionofload,lubrication,slidingvelocity,etc.,thecalculatedlifecanbeusedasapracticalmeasureofexpectedservicelife.1LifeofSteel-on-steelsphericalbushings[1]ConfirmationofpVvalue
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