>> P.482
Astheactuallifeisaffectedbymanyfactorssuchasthematerialoftheslidingsurface,themagnitudeanddirectionofload,lubrication,slidingvelocity,etc.,thecalculatedlifecanbeusedasameasureofexpectedservicelife.1LifeoflubricationtypePILLOBALLs PB・PHS(…A)・POS(…A)・PHSB・POSB[1]ConfirmationofpVvalueBeforeattemptingtocalculatethelife,makesurethattheoperatingconditionsarewithinthepermissiblerangebyreferringtothepVdiagraminFig.2.Whentheoperatingconditionsareoutofthepermis-siblerange,pleaseconsultIKO.ThecontactpressurepandtheslidingvelocityVareobtainedfromthefollowingequations. 50P p=Cdt ………………………………………(3)V=5.82×10-4dkβf……………………(4)where,p:Contactpressure,N/mm2P: Equivalentradialload,N Cdt:Dynamicloadcapacityconsideringtemperatureincrease,N(Refertoequation(2).)(Refertoequation(1).)V:Slidingvelocity,mm/sdk: Spherediameter,mm(Refertothedimensionaltables.)2β:Oscillatingangledegrees(RefertoFig.3.)whenβ<5°, β=5whenrotating,β=90 f:Numberofoscillationsperminute, min-1Permissiblerange125102050100200SlidingvelocityVmms/6040201068421mm/N2pContactpressureFig.2pVdiagramoflubricationtypePILLOBALLsMaximumOperatingLoadthedynamicfactor,whichdiffersdependingonTherecommendedvalueofbushingloadisobtainedloadcapacityCdbyabymultiplyingnumericalthebushingtypeandloadcondition.ForPILLOBALLRodEnds,thestaticloadcapacityCsmustalsobecon-sideredindeterminingtheapplicablebushingload.Table6showstheguidelinesformaximumoperatingloadofPILLOBALLs.Whenaxialloadsareaddedinadditiontoradialloads,bendingstressoccursinthebody.Payattentiontothisbendingstress.Table6MaximumoperatingloadTypeLoaddirectionConstantAlternate≦0.3Cd≦0.3CdPBPHS(…A),POS(…A),PHSB,POSBPHSAPHS…EC,POS…ECRemark disthedynamicloadcapacityandCsisthestaticload≦0.6Cd≦0.2Cs≦0.16Cs≦0.3Cs≦0.2Cscapacity.Equivalentradialloadtime.WhenPILLOBALLscantakeradialandaxialloadsatthesamethemagnitudeanddirectionofloadsareconstant,theequivalentradialloadcanbeobtainedbythefollowingequation.P=Fr+YFa…………………………………(2)where,P:Equivalentradialload,N Fr:Radialload,N Fa:Axialload,N Y:Axialloadfactor(RefertoTable7.)Table7AxialloadfactorY0.10.20.30.40.5>0.511223345UnusableUnusableFa/FrTypePBPHS(…A),POS(…A)PHSB,POSBPHS … ECPOS … ECLifeThelifeofPILLOBALLsisdefinedasthetotalnumberofoscillatingmotionsduringwhichthePILLOBALLscanbeoperatedwithoutfailureormalfunctionduetowear,increaseininternalclearance,increaseinslid-ingtorqueandoperatingtemperature,etc.K33
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