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oilflowsalongthegroovesinthecaseandaccumu-latesintheoilpockets,keepingtheoillevelconstant.Sotheoilissteadilysuppliedtothebearing.Fig.22Oilsplashlubricationlubrication4OilcirculatinglubricationWhenautomaticismoreeconomicalbecauselubricationisrequiredatmanypoints,orwhencoolingisrequiredforhighrotationalspeed,thismethodisused.Theoilissuppliedwithapump,whichcancontroltheoilpressure,andafilterorcool-er,etc.canbesetupinthecirculationsystem,mak-ingthisanidealmethodoflubrication.AsshowninFig.23,theoilsupplyanddischargeportsarelocatedoppositeismadelargetopreventtheaccumulationofoil.toeachother,andthedischargeportOillubricationifisWhenistheamountthemostcommonlyusedoil1OilbathlubricationThislubricationmethod,andisusedformediumandlowspeeds.Iftheamountofoilistoolarge,heatwillbegeneratedbychurning,andtoosmall,seizureTherefore,thecorrectamountofoilmustwilloccur.bemaintained.isstationary,thecorrectoillevelinthecaseofabearingmountedonahorizontalshaft,isnearthecenterofthelowestrollingelement.Inthecaseofaverticalshaft,about50%ofthesurfacesoftherollingelementsshouldbesub-mergedinoil.Ittoprovideanoilgaugesothattheoillevelcanbeeasilycheckedwhilethemachineissta-tionaryorrunning.themachineisdesirabletheystrikeBecauseoilsprayremoves2OildriplubricationOildrips,whicharefeddownfromasight-feedoileroralongafiberstring,becomeanoilsprayduetowindpressuregeneratedbytherotatingcage,shaft,nut,etc.,ortherotatingpartsandformanoilspray,whichfillsupthehousingandeveryrequiredpart.frictionalheat,thismethodhasamoreeffectivecoolingeffectthantheoilbathmethod,andiswidelyusedforhigh-speedrota-tionandmediumloadconditions.Inthecaseofthesight-feedoiler(Fig.21),thenumberthisisdifficultofdripscanbeadjusted.usingThenumberofdripsdependsonthebearingtype,rotationalspeed,etc.,but5〜6dripsperminuteisgenerallyused.thestring-feedmethod.However,Fig.23Oilcirculatinglubrication5OilmistlubricationAfterdirtanddustareremovedbyafilter,theoilisturnedintoaspraybydrycompressedair,andthislubricatesthebearing.Whentheairandoilpassthroughthebearing,theaircoolsthebearingandtheoillubricatesit.Inaddition,becausetheairinsidethehousingisatahigherpressurethantheoutsideair,theentryofwaterandforeignparticlesisprevented.Therearemanyotheradvantagesofthismethod,anditissuitableforhighrotationalspeedapplicationssuchashighspeedinternalgrindingspindles.6OiljetlubricationThisisahighlyreliablelubricationmethodandisusedundersevereconditionssuchasultra-highrotationalspeedsandhightemperatures.Thespeedoftheoiljetshouldbemorethan20%oftheperipheralspeedoftheinnerringracewaysurface,sincetheairaroundFig.21Oildriplubrication3OilsplashlubricationInthismethod,oilissplashedinalldirectionsbytherotationofthegearordisk.Thiscanbeusedforcon-siderablyhigh-speedrotationswithoutsoakingthebearingdirectlyinoil.Inthegearcasewhereshaftsandbearingsarelubri-catedwiththesameoil,wearparticlesmaybeintro-ducedthebearingastheymightgetmixedwiththeoil.Inthiscase,apermanentmagnetisprovidedatthebottomofthegearcasetocollectmetalparti-cles,orashieldplateisinstallednexttothebearing.Fig.22showsanothermethodinwhichthesplashedintoA51
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