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GStructures of Combined Type Needle Roller Bearings■Structure and FeaturesIKO Combined Type Needle Roller Bearings are com-binations of a radial bearing and a thrust bearing. Caged needle roller bearings are used as radial bear-ings and thrust ball bearings or thrust roller bearings are used as thrust bearings. They are compact and very economical, and can be subjected to radial loads and axial loads simultaneously.They are widely used for machine tools, textile Outer ringmachinery, and industrial machinery.Bearing ring for thrust bearingDust coverThrust ball bearingInner ringRadial needle roller bearing■TypesThe types of Combined Type Needle Roller Bearings shown in Table 1 are available.Table 1.1 Type of bearingTypeCombined with thrust ball bearingCombined with thrust roller bearingWithout inner ringWith inner ring(1)Without inner ringWith inner ring(1)──NAXNAXINBXNBXIWith dust coverNAX … ZNAXI … ZNBX … ZNBXI … ZTable 1.2 Type of bearingTypeCombined with angular Combined with three-point contact ball bearingcontact ball bearingModel codeNATANATBNote(1) or the Combined Type Needle Roller Bearings with inner rings, the needle roller bearings and inner rings will be delivered separately. Please contact IKO if in need of delivery as an integrated product.Needle Roller Bearings with Thrust Ball BearingIn this series, needle roller bearings are combined with thrust ball bearings to receive thrust loads.In bearings with a dust cover, the dust cover is formed from a thin steel plate and xed to a groove cut on the outer cylindrical surface of the outer ring collar. The cover forms a labyrinth with the thrust raceway ring, and is therefore effective in preventing leakage of grease and penetration of dust and dirt.In the case of bearings without an inner ring, the toler-ances of roller set bore diameter Fw are shown Table 14 on page A33. Therefore, the required radial in internal clearances can be selected by combining the bearings with shafts that have been heat-treated and finished by grinding as shown in Table 23 on page A42 and Table 26 on page A44.Bearing ring for thrust bearingRadial needle roller bearingOuter ring Inner ringOuter ringInner ringOuter ringInner ring(A) Thrust roller bearingNeedle roller cage Ball cage (Angular contact type)Needle roller cageInner ring(B) Ball cage (3-point contact type)G2
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