>> P.275
G■Rating LifeIn Combined Type Needle Roller Bearings, caged needle roller bearings are subjected to radial loads while thrust bearings receive axial loads. Therefore, it is necessary to calculate their lives respectively (See page A17).■MountingFig.1 shows mounting examples of Combined Type Needle Roller Bearings. When applying preload to the NAX and NBX models, it is recommended that thrust raceway rings are not tightened directly with nuts, but are tightened using springs as shown in Fig. 2.Mounting two NATA models symmetrically allows them to be subjected to two-way axial loads. When mounting these models, an axial clearance of 0.2〜0.3 mm should be provided in the angular contact ball bearings so that radial loads are not applied to the angular contact ball bearings.Dimensions related to mounting should be based on the table of dimensions.Table 2 TolerancesItemType ofbearingDimensionunit: mmDimension symbolToleranceNAX(I)(1)NBX(I)(1)Bore dia. of bearing ring for thrust bearingAssembled bearing widthBearing height of thrust bearingNATB59 Width of inner ringdiLHBE7 0-0.25 0-0.20 0-0.3Note(1)Also applicable to bearings with dust cover■ClearanceCombined Type Needle Roller Bearings are manufac-tured to have the radial internal clearance CN shown in Table 18 on page A37.■FitThe recommended fits for Combined Type Needle Roller Bearings are shown in Table 3.Table 3 Recommended fitsItemTolerance classType of bearingNAX(I)(1)NBX(I)(1)NATA59NATB59ShaftWithout inner ringWith inner ringHousing boreh5,k5k5K6,M6──k5(2)M6(2)Notes(1) The housing bore for thrust bearing must be the machined to be more than 0.5 mm larger than the out-side diameters D1 and D2 incur radial loads.it does not to ensure that (2) f the t is made tighter than specied in this table, radial loads will act upon the thrust bearing, limiting its function.■LubricationGrease is not prepacked in Combined Type Needle Roller Bearings, so perform proper lubrication for use. Operating without lubrication will increase the wear of the rolling contact surfaces and shorten the bearing life.■Oil HoleThe outer ring of Combined Type Needle Roller Bearings has an oil groove and an oil hole. When outer rings with multiple oil holes or inner rings with oil hole(s) are required, please contact IKO.Fig.1 Mounting examplesFig.2 Mounting example when applying preloadG4
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