Ball and Roller Bearings

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Bearing Selection2.2 Type and characteristicsTable 2.1 shows types and characteristics of rolling bearings.Table 2.1 Type of rolling bearings and performance comparisonBearing typesDeepgrooveballbearingsAngularcontactballbearingsDouble rowangularcontactball bearingsDuplexangularcontactball bearingsSelfaligningballbearingsCylindricalrollerbearingsSingleflangecylindricalroller bearingsDoubleflangecylindricalroller bearingsDouble rowcylindricalrollerbearingsNeedlerollerbearingsCharacteristicsLoad Carrying CapacityRadial loadAxial loadHigh speed1High rotating accuracyLow noise/vibrationLow friction torqueHigh rigidity1111Vibration/shock resistance 1Allowable misalignmentfor inner/outer ringsStationary in axial direction 2Moveable in axial direction 3Separable inner/outer rings 41Inner ring tapered bore 5RemarksReference pageFor duplexarrangement For DB and DFarrangement For DBarrangementNU, NtypeNJ, NFtypeNUP, NP, NH NNU, NNtype typeB-5 B-43 B-60 B-43 B-65 B-77 B-77 B-77 B-102NAtypeTaperedrollerbearingsDouble-row,4-rowtaperedrollerbearingsSphericalrollerbearingsThrustballbearingsCylindricalrollerthrustbearingsSphericalrollerthrustbearingsReferencepageBearing typesCharacteristicsLoad Carrying CapacityRadial loadAxial loadA-701High speedA-35High rotating accuracy1Low noise/vibration1A-71Low friction torque1For duplexarrangementB-119B-119B-219B-255Includingneedle rollerthrust bearingB-255A-58A-21A-85A-15A-15A-85High rigidity1Vibration/shock resistance 1Allowable misalignmentfor inner/outer ringsStationary in axial direction 2Moveable in axial direction 3Separable inner/outer rings 4Inner ring tapered bore 5RemarksReference page11 The number of stars indicates thedegree to which that bearing typedisplays that particular characteristic. Not applicable to that bearing type.2 Indicates dual direction. Indicatessingle direction axial movement only.3 indicates movement in the axialdirection is possible for the racewaysurface; indicates movement in theaxial direction is possible for the fittingsurface of the outer ring or inner ring.4 Indicates both inner ring and outerring are detachable.5 Indicates inner ring with tapered boreis possible.A-14
Bearing Selection2.3 Selection of bearing arrangementShafts or axles are generally supported by a pair ofbearings in the axial and radial directions. The bearingwhich prevents axial movement of the shaft relative to thehousing is called the "fixed side bearing" and the bearingwhich allows axial movement relatively is called the"floating-side bearing". This allows for expansion andcontraction of the shaft due to temperature variation andenables error in bearing mounting clearance to beabsorbed.The fixed side bearing is able to support radial andaxial loads. A bearing which can fix axial movement inboth directions should therefore be selected. A floatingsidebearing that allows movement in the axial directionwhile supporting a radial load is desirable. Movement inthe axial direction occurs on the raceway surface forbearings with separable inner and outer rings such ascylindrical roller bearings, and occurs on the fitting surfacefor those which are not separable, such as deep grooveball bearings.In applications with short distances between bearings,shaft expansion and contraction due to temperaturefluctuations is slight, therefore the same type of bearingmay be used for both the fixed-side and floating-sidebearing. In such cases it is common to use a set ofmatching bearings, such as angular contact ball bearings,to guide and support the shaft in one axial direction only.Table 2.2 (1) shows typical bearing arrangementswhere the bearing type differs on the fixed side andfloating side. Table 2.2 (2) shows some common bearingarrangements where no distinction is made between thefixed side and floating side. Vertical shaft bearingarrangements are shown in Table 2.2 (3).Table 2.2 (1) Bearing arrangement (distinction between fixed and floating-side)FixedArrangementFloatingCommentApplication(Reference)1. General arrangement for small machinery.2. For radial loads, but will also accept axial loads.Small pumps,auto-mobiletransmissions, etc.1. Suitable when mounting error and shaft deflection are minimal or usedfor high rotational speed application.2. Even with expansion and contraction of shaft, floating side movessmoothly.Medium-sizedelectric motors,ventilators, etc.1. Radial loading and dual direction of axial loading possible.2. In place of duplex angular contact ball bearings, double-row angularcontact ball bearings are also used.Worm reductiongear1. Heavy loading capable.2. Shafting rigidity increased by preloading the two back-to-backfixed bearings.3. Requires high precision shafts and housings, and minimal fittingerrors.Reduction gears forgeneral industrialmachinery1. Allows for shaft deflection and fitting errors.2. By using an adaptor on long shafts without screws or shoulders,bearing mounting and dismounting can be facilitated.3. Self-aligning ball bearings are used for positioning in the axial direction,and not suitable for applications requiring support of axial load.General industrialmachinery1. Widely used in general industrial machinery with heavy and shockload demands.2. Allows for shaft deflection and fitting errors.3. Accepts radial loads as well as dual direction of axial loads.Reduction gears forgeneral industrialmachinery1. Accepts radial loads as well as dual direction axial loads.2. Suitable when both inner and outer ring require tight fit.Reduction gears forgeneral industrialmachinery1. Capable of handling large radial and axial loads at high rotationalspeeds.2. Maintains clearance between the bearing’s outer diameter andhousing inner diameter to prevent deep groove ball bearings fromreceiving radial loads.Transmissions fordiesel locomotivesA-15
Page 1 and 2: For New Technology NetworkRcorporat
Page 3 and 4: WarrantyNTN warrants, to the origin
Page 5 and 6: TECHNICAL DATA CONTENTS1. Classific
Page 7 and 8: Classification and Characteristics
Page 15: Bearing SelectionSelect bearing’s
Page 19: Load Rating and Life3. Load Rating
Page 22 and 23: Load Rating and LifeThe basic stati
Page 24 and 25: Bearing Load CalculationTable 4.2 G
Page 26 and 27: Bearing Load Calculation4.3 Mean lo
Page 28 and 29: Bearing Load CalculationTable 4.5 B
Page 30 and 31: Bearing Load Calculation(Example 4)
Page 32 and 33: Boundary Dimensions and Bearing Num
Page 34 and 35: Boundary Dimensions and Bearing Num
Page 37 and 38: Bearing Tolerances6. Bearing Tolera
Page 39 and 40: Bearing TolerancesMean bore diamete
Page 41 and 42: Bearing TolerancesUnitmInner ringax
Page 43 and 44: Bearing TolerancesTMaster cupsub-un
Page 45 and 46: Bearing TolerancesInner ringaxial r
Page 47 and 48: Bearing TolerancesTable 6.8 Toleran
Page 49 and 50: Bearing Tolerances!d!d2ddd+!dd+!dBT
Page 51 and 52: Bearing Fits7. Bearing Fits7.1 Fitt
Page 53 and 54: Bearing Fits(4) A particular type o
Page 55 and 56: Bearing FitsTable 7.3 Standard fits
Page 57 and 58: Bearing FitsA-5512T12.5T13.5T16.5T2
Page 59 and 60: Bearing FitsTable 7.7 General fitti
Page 61 and 62: Bearing Internal Clearance and Prel
Page 63 and 64: Nominal bore diameterdmm10241024303
Page 65 and 66: Bearing Internal Clearance and Prel
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Bearing Internal Clearance and Prel
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Friction and Temperature Rise10. Fr
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Lubricationviscosity base oil are b
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LubricationAluminum greaseAI soapNo
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Lubrication11.5 Oil lubricationOil
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LubricationTable 11.9 Factor KExpel
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External bearing sealing devicesTyp
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Bearing Materials13. Bearing Materi
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Shaft and Housing Design14. Shaft a
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Shaft and Housing Design14.2.3 Thru
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Bearing Handling280280Diametric exp
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Bearing HandlingTable 15.1 Installa
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Bearing HandlingLarge bearings, ins
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A-95
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Bearing Damage and Corrective Measu
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Bearing Damage and Corrective Measu
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Technical DataThis data is based on
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Technical Data17.5 Fitting surface
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Ball and Roller Bearings
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Tapered Roller Bearings !!!!!!!!!!!
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!Deep Groove Ball Bearings2. Standa
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Deep Groove Ball BearingsBrrDdd Op
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Deep Groove Ball Bearingsd Boundar
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Deep Groove Ball BearingsBrrarraDdD
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Expansion Compensating BearingsBrrD
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AC BearingsBrrDdd Open typeShielde
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!Miniature and Extra Small Bearings
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!Miniature and Extra Small Bearings
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Miniature and Extra Small Ball Bear
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Angular Contact Ball Bearings1.2 Fo
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Single and Duplex Angular Contact B
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Four-Point Contact Ball BearingsQJ
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Double Row Angular Contact Ball Bea
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Double Row Angular Contact Ball Bea
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Self-Aligning Ball Bearings1. Desig
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Self-Aligning Ball BearingsEquivale
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Adapters(for self-aligning ball bea
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AdaptersB-75
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Cylindrical Roller BearingsTable 2
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Cylindrical Roller BearingsBBrr1rr1
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L Type Loose RibL type collar ringB
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L Type Loose RibL type collar ringB
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Double Row Cylindrical Roller Beari
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Four-Row Cylindrical Roller Bearing
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Tapered Roller BearingsSingle row t
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Tapered Roller Bearings5. ECO-Top t
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Tapered Roller BearingsInch series
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Tapered Roller BearingsSaSbr1aEquiv
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Tapered Roller BearingsDa dbr1arada
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Tapered Roller Bearingsr1araEquival
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Double Row Tapered Roller BearingsS
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Four Row Tapered Roller BearingsBea
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Spherical Roller Bearings2. Standar
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Spherical Roller BearingsBrrDddCyli
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Adapter(For spherical roller bearin
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Withdrawal Sleeves(For spherical ro
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Thrust BearingsSingle direction thr
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Thrust BearingsB-257
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Single Direction Thrust Ball Bearin
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Single Direction Thrust Ball Bearin
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Spherical Roller Thrust Bearingsdar
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Locknuts, Lockwashers& Lockplates
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LocknutsReferencewithdrawal sleeve
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LocknutsReferencebore no. lock- Sh
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Locknutsr1gbhsrB30˚ Gd2dPd6d1Beari
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NutsReferencewithdrawal sleeve no.A
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LockwashersSeries AWƒ25˚r2B2ƒ1B1
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LockwashersSeries AWLƒ25˚r2B2ƒ1B
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Snap rings and grooves for rolling
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Snap rings and grooves for rolling
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Catalog List and Appendix Table Con
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Catalog ListCATALOG TITLESCATALOG N
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D-41234567890001020304/2205/2806/32
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Appendix TableAppendix table 2: Com
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Appendix TableAppendix table 5: Dim
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Appendix TableAppendix table 6: Dim
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Appendix TableAppendix table 7: Bas
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Appendix TableAppendix table 9: Kgf
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D-16Rockwell hardnessBrinell hardne
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Ball and Roller Bearings

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