>> P.50
3LabyrinthAlthoughitisalittledifficulttomake,thelabyrinthisveryeffectiveinpreventingoilleakageespeciallyathighspeeds.Atlowspeeds,fillingthelabyrinthwithgreaseiseffectiveinpreventingtheentryofdust.InFig.17,itisnecessarytosplitthehousingorcoverplateintotwo.InFig.18,itiseasytoassemble,andifcombinedwithanoilseal,itimprovesthesealingeffect.Table31showsthelabyrinthclearancesgenerallyused.(1)(2)Fig.17Fig.18Table31Labyrinthclearance unit:mmShaftdia.Incl.50mmOver50mmClearanceRadialdirectionAxialdirection0.25〜0.40.5〜11〜23〜5Table30Clearancebetweengroovedshaftandhousingbore unit:mmShaftdia.Incl.50mmOver50mmClearance0.25〜0.40.5〜1Fig.15flingertothecentrifugalisadiskattached2FlingertotheshaftwhichTheoilforceofrotationthrowsoffoildueandthuspreventsoilleakageandtheentryofforeignparticles.Fig.16(1)showsanexampleinwhichtheflingerislocatedinsidethehousing,mainlytopreventoilleakage.Sinceitsucksindustanddirt,itshouldbeusedinadustfreeenvironment.Fig.16(2)showsanexampleinwhichtheflingerislocatedoutsidethehousing,andincombinationwithanothersealingdevice,toprevententryofforeignparticles.isused(1)(2)Fig.16A47
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