>> P.23
Ⅱ-15LoadRatingandAllowableLoadBasicdynamicloadratingC,basicstaticloadratingC0,andallowableloadFoftheCRWGseriesandCRWG…Hseriesshowvaluesfordownwardloadsincaseofparallelarrangementoffourwaysandtwopairsofrollercagesasoneset.(RefertoFig.5)Inaddition,theupwardandlateralloadratingisthesameasdownwardloadrating.FortheCRWseries,sincethenumberofcylindricalrollersthatshareloadofeachdirectionvaries,theloadratingforeachloaddirectionandallowableloadmustbeobtained.Inaddition,basicdynamicloadratingCU,basicstaticloadratingC0U,andallowableloadFUinthedimensiontableshowvaluespercylindricalroller.BasicdynamicloadratingC,basicstaticloadratingC0,andallowableloadFoftheCRWseriesareobtainedbasedontheequationindicatedinTable8.1andTable8.2.Formoreinformationonthedefinitionofloadratingandcalculatedload,seepageⅢ-3.AllowableloadAllowableloadreferstoloadofsmoothrollingmotiononcontactsurfacetowhichmaximumcontactstressisappliedandthesumofwhoseelasticdeformationofrollingelementsandracewayissmall.Therefore,useappliedloadwithintheallowableloadrangeifverysmoothrollingmotionandhighaccuracyarerequired.Fig.5DirectionofloadratingoftheCRWGseriesandCRWG…HseriesC,C0,FTable8.1CalculatingformulaofloadratingandallowableloadofstandardtypeCRWseriesLoaddirectionUpwardanddownwardload(1)LateralloadBasicdynamicloadratingCNCr={(Z―2-1)2p}1/36(Z―2)3/4CU(1)Ca={(Z―2-1)2p}1/36(Z―2)3/427/9CU(4)BasicstaticloadratingC0NC0r=(Z―2)C0U(2)C0a=2(Z―2)C0U(5)AllowableloadFNFr=(Z―2)FU(3)Fa=2(Z―2)FU(6)CodedescriptionCr:BasicdynamicloadratingincaseupwardanddownwardloadisappliedNCa:BasicdynamicloadratingincaselateralloadisappliedNC0r:BasicstaticloadratingincaseupwardanddownwardloadisappliedNC0a:BasicstaticloadratingincaselateralloadisappliedNFr:AllowableloadincaseupwardanddownwardloadisappliedNFa:AllowableloadincaselateralloadisappliedNZ:henumberofcylindricalrollersincorporatedinarollercage(omitthefiguresafterthedecimalfractionsforZ―2)p:Inter-pitchdimensionsofcylindricalrollersmmCU:BasicdynamicloadratingpercylindricalrollerNC0U:BasicstaticloadratingpercylindricalrollerNFU:AllowableloadpercylindricalrollerNNote(1):ncaseofparallelarrangementinthisloaddirection,calculationmustbeperformedbasedontheequations(7),(8),and(9)inTable8.2.LoadLoadLoadLoad
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