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J12■AllowablerotationalspeedAllowablerotationalspeedsofCrossedRollerBearingsareaffectedbymountingandoperatingcon-ditions.ThevaluesingeneraloperationareshowninTable13.Table13dmnvalues(1)ofCrossedRollerBearingsLubricantTypeWithcageorwithseparatorFullcomplementOpentypeSealedtypeOpentypeSealedtype75000600005000040000150000-75000-GreaseOilNote(1)・dmnvalue=dm×nwhere, dm: Meanvalueofbearingboreandoutsidediameters, mm n: Numberofrotationsperminute, min-1 ■RotationaltorqueRotationaltorqueofIKOCrossedRollerBearingsarelowerthanthatofplainbearingsandthedifferencebetweenthestatictorqueandthedynamic(kinetic)torqueissmall.Therefore,thesebearingsminimizepowerconsumptionandoperatingtemperatureriseofmachineryandincreasetheoverallefficiencyofmachines.Therotationaltorqueisaffectedbymanyfactors,butthefollowingequationscanbeusedexpediently.DpwT=μP0r———2where,T:Rotationaltorque,N・mmμ:Frictioncoefficient(Approx.0.010)P0r:Staticequivalentradialload,NDpw:Pitchcirclediameter,mmd+DDpw≒————2■LubricationThesebearingsaregenerallylubricatedwithgrease.Greaseissuppliedthroughtheclearancebetweentheinnerringandtheouterring.GreasespecificationisshowninTable14,ALVANIAGREASEEP2(ShellLubricantsJapanK.K.)isprepackedasthelubricatinggrease.Forbearingswithoutprepackedgrease,supplygreaseoroilforuse.Operatingwithoutlubricationwillincreasethewearontherollingcontactsurfacesandgreatlyaffectnoiseandheatgeneration,leadingtoashorterbearinglife.Forthesealedtype,becarefulwithpressurewhenapplyinggreasesothatthesealsdonotcomeoff.Table14Bearingswithprepackedgrease○:Withprepackedgrease×:WithoutprepackedgreaseWhenusingaspecialgrease,carefullyexaminethegreasepropertiesandcontentssuchasbaseoilvis-cosityandextremepressureadditives.Inthiscase,pleasecontactIKO.■OilHoleForCrossedRollerBearings,oilholesandoilgroovescanbeprovidedonbearingringsifrequested.However,thisisnotapplicabletoSuperSlimTypeCrossedRollerBearingsandMountingHoledTypeSuperSlimCrossedRollerBearings.SlimCrossedRollerBearings.Whenanoilholeisrequiredontheouterring,attach"-OH"beforetheclearancesymbolintheidentificationnumber.Whenanoilholeandanoilgroovearerequiredontheouterring,attach"-OG"atthesameplaceintheidentificationnumber.Foranoilholeontheinnerring,attach"/OH",andforanoilholeandanoilgrooveontheinnerring,attach"/OG",atthesameplaceintheidentificationnumber.HighRigidityTypeCrossedRollerBearingsVandMountingHoledTypeHighRigidityTypeCrossedRollerBearingsVhaveanoilgrooveandtwooilholesontheouterringasstandard.Table15showsavailabilityofoilholesforeachbearingtype.Table15OilholesNotes(1) CRBHV…AandCRBFV…Aareprovidedwithanoilgrooveandtwooilholesontheouterring.Remark ndenotesthenumberofoilholesnotexceeding4.Foroneoilhole,numberisnotindicated.Whenpreparingmultipleoilholes,pleasecontactIKO.( )ModelcodeSealspecificationOpentype(Nosymbol)Sealedtype(UU)Onesidesealedtype(U)CRBHV… A×〇-CRBFV… A×〇-CRBC×〇×CRB×〇×CRBT… A〇--CRBTF… A〇--CRBS×--CRBS… A-〇×CRBS… V×〇×BearingtypeOilholecode/nOH/nOG-nOH-nOGCRBHV… A〇〇--(1)CRBFV… A----(1)CRBC〇〇〇〇CRB〇〇〇〇CRBT… A----CRBTF… A----CRBS〇-〇-CRBS… A〇-〇-CRBS… V〇-〇-JCRBHVCRBFVCRB(C)CRBTCRBTFCRBS1N=0.102kgf=0.2248lbs.1mm=0.03937inch
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