>> P.136
C19TheidentificationnumberofNeedleRollerCagesforEngineConnectingRodsconsistsofamodelcode,dimensionsandanysupplementalcodesasshownbelow.■IdentificationNumberThediametertolerancesofneedlerollersofNeedleRollerCagesforEngineConnectingRodsareclassi-fiedasshowninTable2.Whentheclassificationsymbolisnotindicatedintheidentificationnumber,theclassificationsymbol"B2"isapplied.ThetoleranceofthecagewidthBcis-0.2〜-0.4mm.ButcageswithmarksintheBccolumninthedimensiontablesaremanufacturedwiththefollowingwidthtolerances.●:0〜-0.2mm■:-0.1〜-0.3mm■AccuracyNeedleRollerCagesforBigEndKT…EGTheserollercagesaresubjectedtoaccelerationanddecelerationduringtheirrotatingandepicyclicmotionduetocrankshaftrotation.Towithstandsuchcondi-tions,theyaremadeofaspecialalloyandarelight-weightwithhighrigidity.Theyareguidedontheirouterperipherysurfacewithsuperiorlubricatingproperties.Forthepurposeofusingthemunderseverecondi-tionssuchashighrotationalspeedandstringentlubri-cation,bearingsplatedwithnon-ferrousmetalsarealsoavailableonrequest.High-loadcapacityandhigh-rigiditycagestobeusedforracingmotorcycles(Seethephotobellow.),splitneedlecagesforsolid(one-piece)typecrank-shaftsandotherspecialspecificationcagesofvarioustypesarealsoavailable.PleaseconsultIKOwhenrequired.NeedleRollerCagesforSmallEndKTV…EGTheserollercagesoscillatesathighspeedswithinalimitedloadingzoneunderheavyshockloads.Thus,thesecagesaredesignedtobelightweightandhavehighrigiditywithawell-balancedstructure.Inthesecages,anumberofneedlerollershavingasmalldiameterareincorporatedtoreducetherollingcon-tactstressintheloadingzone.NeedleRollerCagesforSmallEndareclassifiedintotwotypes,theoutersurfaceguidetypeandtheinnersurfaceguidetype.Thisclassificationisshowninthetableofdimensions.Intheoutersurfaceguidetype,thecageisguidedbytheslidingcontactbetweentheinnersurfaceoftheconnectingrodandtheoutersurfaceofthecage.Intheinnersurfaceguidetype,thecageisguidedbytheslidingcontactbetweentheoutersurfaceofthepinandtheinnersurfaceofthecage.ModelcodeSupplementalcodeDimensionsKT2216EGB2Typeofbearing28Toleranceofmeanvalueofrollerdia.(SeeTable2.)Examplesofidenti(cid:16)cationnumberRollersetborediameter(22mm)Rollersetoutsidediameter(28mm)Widthofcage(16mm)High-loadcapacityandhigh-rigiditycage KTZ … EG■ClearanceRadialinternalclearancesareselectedaccordingtothetypeofengineandtheoperatingconditions(rota-tionalspeed,load,lubricatingconditions,etc.).Ifabearingisusedwithaninadequateclearance,bearingtroublessuchasseizure,earlyflakingandnoiseincreasemayoccur,leadingtoanenginefailure.Therefore,itisnecessarytoselecttheclearancecarefullyaccordingtotestresultsandexperience.Table2TolerancesofneedlerollerdiameterClassClassificationsymbol(1)Toleranceofmeanvalueofrollerdia.(2)StandardSemi-standardB2B4B6B8B100〜- 2-2〜- 4-4〜- 6-6〜- 8-8〜-10Notes(1) Theclassificationsymbolisindicatedattheendoftheidentificationnumber.(2) TolerancesforcircularityarebasedonJISB1506(Rollingbearings-Rollers).unit:μm
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