Ball and Roller Bearings

!Deep Groove Ball BearingsOpen type Shielded type Sealed type (non-contact) Expansion Compensating Bearing1. Design features and special characteristicsDeep groove ball bearings are very widely used. A deepgroove is formed on each inner and outer ring of the bearingenabling them to sustain radial and axial loads in eitherdirection as well as well as the complex loads which resultfrom the combination of these forces. Deep groove ballbearings are suitable for high speed applications.In addition to unsealed bearings, deep groove ballbearings include ball bearings with greased sealed inside(sealed or shielded) and bearings with a snap ring thatsimplify structure around the bearing and design.Table 1 shows the construction and special characteristicsof various sealed deep groove ball bearings.Table 1 Sealed ball bearings: construction and characteristicsType, code no.Shielded typeSealed typeNon-contact type ZZ Non-contact type LLB Contact type LLU Low torque type LLHConstruction¡Metal shield plate isaffixed to outside ring;inner ring incorporatesa V-groove andlabyrinth clearance.¡Outer ring incorporatessynthetic rubber moldedto a steel plate; sealedge is aligned withV-groove along innerring surface withlabyrinth clearance.¡Outer ring incorporatessynthetic rubber moldedto a steel plate; sealedge contacts V-groovealong inner ringsurface.¡Basic construction thesame as LU type, butspecially designed lipon edge of sealprevents penetration byforeign matter; lowtorque construction.Performance comparisonTorqueDust proofingWater proofingHigh speed capacityAllowable temp.range 1Low Low Rather highMediumVery goodPoorSame as open typeDepends on lubricantBetter than ZZ-typePoorSame as open typeExcellentVery goodLimited by contact sealsMuch better than LLB-typeVery goodMuch better than LLU-type-25 120 -25 110 -25 120 1 Please consult NTN Engineering about applications which exceed the allowable temperature range of products listed on this table.Note : This chart lists double shielded and double sealed bearings, but single shielded (Z) and single sealed (LB, LU, LH) are also available.Grease lubrication should be used with single shielded and single sealed bearings.B-5