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C4RadialclearancesofNeedleRollerCagesforGeneralUsagearedeterminedbythedimensionalaccuracyoftheracewaysandneedlerollers.Table3showstherecommendedfitsfortheoperatingconditions.■Fit■Specificationsofshaftandhousing■OperatingtemperaturerangeFortheraceways,asurfacehardnessof58〜64HRCandasurfaceroughness0.2μmRaorlessaredesir-able.However,whentheoperatingconditionsarenotsevere,asurfaceroughness0.8μmRaorlesscanbeused.Whenthesurfacehardnessislow,itisnecessarytocorrecttheloadratingbythehardnessfactorspeci-fiedonpageA20.■MountingThedimensionsrelatedtomountingofNeedleRollerCagesforGeneralUsageareshowninFigs.1and2.WhenmountingNeedleRollerCagesforGeneralUsage,theyareaxiallypositionedbyusing,forexam-ple,Cir-clipsforshaftandhousingbore(WRandARonpageL17)asshowninFigs.3,4and5.Forhighrotationalspeedapplications,aheattreatedandgroundspacerispositionedbetweenthecageandthecir-clipasshowninFig.5sothatthecagedoesnotmakedirectcontactwiththecir-clip.Inthiscase,thecir-clipisnormallymountedonthenon-rotatingside.Fig.3showsamountingexampleinthecaseofouterringrotation,andFigs.4and5showexamplesinthecaseofinnerringrotation.Whenhighoperatingaccuracyisrequired.Whenshockloadsandoscillatingmotionsareapplied.ForgeneraluseWhenthetemperatureishigh,ormountingerrorsarelarge.j5h5h5g6g5f6ShaftOperatingconditionsToleranceclassofshaftFw≦68mmFw>68mmTable3ecommendedfitsofshafttothehousingborediameterG6Remark Whensettingtherequiredradialclearanceaccordingtotheoperatingconditions,theclearancecaneasilybeobtainedbyselectingandmatchingthetolerancesofneedlerollers,shaftandhousingbore.Whenvariationoftheclearancedoesnotcreateanyproblems,h6andG7areusedforshaftandhousingbore,respectively.Fig.1Fig.2Fig.3Fig.4Fig.5Theoperatingtemperaturerangeforhighcarbonsteelcagetypesis-20to120°C.Themaximumallow-abletemperatureforsyntheticresincagetypesis+110゜C,and+100゜Cwhentheyarecontinuouslyoperated.DwDwBcH112|3DwDwBcH112|3C1N=0.102kgf=0.2248lbs.1mm=0.03937inch
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