>> P.55
1N=0.102kgf=0.2248lbs.1mm=0.03937inchintoDuetothethecage.thebearingrotatestogetherwiththebearingforminganairwall.AsshowninFig.24,thejetfromthenoz-thespacebetweentheinnerzleblowsdirectlyringandlargeamountofoilbeingused,itismoreeffectivetomakethedischargeportlarger,andusetheforceddischarge.Whenthedmnvalue(meanvalueofthebearingout-sideandborediametersinmillimeterxrotationalspeedinmin-1)ismorethan1,000,000,thespeedofjetshouldbe10〜20m/s,thenozzlediametertheshouldbeabout1mm,oilsupplypressureshouldbe0.1〜0.5MPa,andtheoilsupplyamountshouldbetherotationalabout500cc/minorgreater.speedtheoilamountshouldbehigher.theoilsupplypressureandishigher,WhenLubricantsForrollingbearings,lubricatinggreaseoroilisgener-allyused.Forspecialapplications,solidlubricantsareused.LubricatinggreaseGreaseisasemi-solidlubricantmadebymixingbaseoil(liquidlubricant)andathickenerunderheatandaddingadditivesasrequired.Therearemanytypesofgreaseaccordingtovariouscombinationsofbaseoil,thickenersandadditives.Greaseisusuallyclassifiedbythickenersandbaseoil.Table35showsthegeneralpropertiesofeachtypeofgrease.ReferenceexamplesofthelubricantgreecebrandandperformanceareshownonpageM46.Fig.24OiljetlubricationTable35PropertiesofvarioustypesofgreaseName(Commonname)CalciumgreaseSodiumgreaseAluminumMixedbasegreasegreaseBariumgreaseLithiumgreaseNon-soapbasegrease(Non-soapgrease)ItemBaseoil()()()MobilegreaseFibergreasegreaseCup()()()BentonegreaseDiestergreaseSilicongreaseMineraloilMineraloilMineraloilMineraloilMineraloilMineraloilDiesteroilSiliconoilMineraloilSyntheticoilThickenerCasoapNasoapAlsoapNa+Casoap,Li+CasoapBasoapLisoapLisoapLisoapBentoneSilicagel.Polyurea,etc.AppearanceButteryFibrousandStringyandFibrousandFibrousandbutterybutterybutterybutteryButteryButteryButteryButteryButteryPourpoint℃80〜90Operatigtemperaturerange℃-10〜+70150〜180-20〜+12070〜90160〜190-10〜+80-10〜+100150〜180-10〜+135170〜190-20〜+120170〜190-50〜+120200〜250-50〜+180200〜None-10〜+150〜+200PressureresistanceStrongtoweakStrongtomediumStrongStrongStrongtomediumMediumMediumWeakMediumtoweakMediumWaterresistanceGoodMechanicalstabilityFairPoorGoodGoodPoorGood,poorforNa+CasoapgreaseGoodGoodGoodGoodGoodGoodGoodPoorExcellentExcellentExcellentGoodGoodtopoorFeaturesandapplicationContainsabout1%water.Whenthetem-peraturerisestomorethan+80°C,thewaterevapo-ratesandthegreasesepa-ratesintooilandsoap.Thisisusedformediumloads.Longfibrousgreasecannotwithstandhighspeeds,buthasgoodpres-sureresis-tanceproper-ties.Shortfibrousgreaseiscompara-tivelygoodforhighspeeds.Ithaswaterandrustresis-tantproper-ties,andadhereseasilytometalsur-face.Usableatfairlyhighspeeds.Ithaswaterandheatresis-tantproper-ties.Thisisanall-purposegrease.Thisisthebestall-purposegreaseamongsoapbasedgreases.Mainlyusedforhightem-peratures.Notsuitedtohighspeedsandheavyloads.Generallygoodheatresis-tance.Greasehavingaminer-albaseoilisforgeneraluse.Greasehavingasyntheticbaseoilissuitableforspecialusewheresuperiorheatandchem-icalresistancepropertiesarerequired.Excellentunderlowtemperatureconditionsandhassuperiorfrictionalprop-erties.Suitableforsmallbearingsusedinmea-suringinstru-ments.A52ABCDEFGHIJKLM
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