>> P.456
K71246102040601002001246810204060100Vmm/spN/mm20.20.010.020.030.040.050.10.20.30.40.50.511234551050100150Vmm/sb3[2]LifecalculationThelifeofsteel-on-steelsphericalbushingscanbecalculatedfromthefollowingequations.G= 3.18b1b2b3 Cdt×105 ……………(5)dkβ PLh= G ……………………………………(6)60fwhere, G:Life(Totalnumberofoscillations) b1:Loaddirectionalfactor(RefertoTable12.) b2:Lubricationfactor(RefertoTable13.)b3:Slidingvelocityfactor(RefertoFig.3.)Cdt:DynamicloadcapacityconsideringtemperatureincreaseN(Refertoequation(1).) P:EquivalentradialloadN(Refertoequation(2).)Lh:Lifeinhoursh f:Numberofoscillationsperminutemin-1Table12Loaddirectionalfactorb1(Steel-on-steel)LoaddirectionLoaddirectionalfactorb115ConstantAlternateTable13Lubricationfactorb2PeriodicallubricationLubricationfactorb2115NoneRegularFig.3SlidingvelocityfactorFig.4pVdiagramofMaintenance-freesphericalbushings()2 2LifeofMaintenance-freesphericalbushings[1]ConfirmationofpVvalueBeforeattemptingtocalculatethelife,makesurethattheoperatingconditionsarewithinthepermissiblerangebyreferringtothepVdiagraminFig.4.Whentheoperatingconditionsareoutofthepermis-siblerange,pleaseconsultIKO.ThecontactpressurepandtheslidingvelocityVareobtainedfromequations(3)and(4)shownonpageK6.[2]LifecalculationThelifeofmaintenance-freesphericalbushingsisobtainedfromthetotalslidingdistanceSwhichisgiveninFig.5forthecontactpressurepobtainedfromequation(3).Thetotalnumberofoscillationsandlifeinhourscanbeobtainedfromthefollowingequations.G=16.67×b1 Sf …………………………(7) VLh= G ……………………………………(8)60fwhere,G:Life(Totalnumberofoscillations)b1:Loaddirectionalfactor(RefertoTable14.)S:Totalslidingdistancem(RefertoFig.5.) f:Numberofoscillationsperminutemin-1V:Slidingvelocitymm/s Lh:LifeinhourshTable14Loaddirectionalfactorb1(Maintenance-free)LoaddirectionLoaddirectionalfactorb110.2(1)ConstantAlternateNote(1) Thisvalueisapplicablewhentheloadchangescom-parativelyslowly.Whentheloadchangesrapidly,pleaseconsultIKO,asthefactordegreasessharply.SlidingvelocitySlidingvelocityfactorLoaddirection:AlternateLoaddirection:ConstantContactpressureSlidingvelocityWhenalternateloadsareapplied,thisrangeisalsopermissible.Permissiblerange
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