>> P.121
C1N=0.102kgf=0.2248lbs.1mm=0.03937inchDw23|Dw23|C4BcH11Fig.1BcH11DwFig.2DwFig.3Fig.4Fig.5■FitRadialclearancesofNeedleRollerCagesforGeneralUsagearedeterminedbythedimensionalaccuracyoftheracewaysandneedlerollers.Table3showstherecommendedfitsfortheoperatingconditions.Table3RecommendedfitsofshafttothehousingborediameterG6ShaftOperatingconditionsWhenhighoperatingaccuracyisrequired.Whenshockloadsandoscillatingmotionsareapplied.ForgeneraluseWhenthetemperatureishigh,ormountingerrorsarelarge.ToleranceclassofshaftFw≦68mmFw>68mmj5h5g6h5g5f6Remark Whensettingtherequiredradialclearanceaccordingtotheoperatingconditions,theclearancecaneasilybeobtainedbyselectingandmatchingthetolerancesofneedlerollers,shaftandhousingbore.Whenvariationoftheclearancedoesnotcreateanyproblems,h6andG7areusedforshaftandhousingbore,respectively.■SpecificationsofshaftandhousingFortheraceways,asurfacehardnessof58〜64HRCandasurfaceroughness0.2μmRaorlessaredesir-able.However,whentheoperatingconditionsarenotsevere,asurfaceroughness0.8μmRaorlesscanbeused.Whenthesurfacehardnessislow,itisnecessarytocorrectthehardnessfactorspeci-fiedonpageA20.loadratingbythe■OperatingtemperaturerangetemperaturerangeTheoperatingforhighcarbonsteelcagetypesis-20to120°C.Themaximumallow-ableforsyntheticresincagetypesis+110゜C,and+100゜Cwhentheyarecontinuouslyoperated.temperature■MountingThedimensionsrelatedtomountingofNeedleRollerCagesforGeneralUsageareshowninFigs.1and2.forGeneralWhenmountingNeedleRollerCagesUsage,theyareaxiallypositionedbyusing,forexam-ple,Cir-clipsforshaftandhousingbore(WRandARonpageL17)asshowninFigs.3,4and5.Forhighrotationalspeedapplications,aheattreatedandgroundspacerispositionedbetweenthecageandthecir-clipasshowninFig.5sothatthecagedoesnotmakedirectcontactwiththecir-clip.Inthiscase,thenon-rotatingside.Fig.3showsamountingexampleinthecaseofouterringrotation,andFigs.4and5showexamplesinthecaseofinnerringrotation.isnormallymountedonthecir-clip
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