NTN - Large Bearings

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Tapered Roller Bearings 1. Type, Structure and Characteristics Tapered roller bearings are designed such that their conical rollers and raceways are arranged so that all elements of the roller and race way cones meet at a common apex on the bearing axis. (Refer to Fig.1) The rolling elements perform the real rotating movement on the raceway; the synthesized force from the inner and outer ring raceways guides the rollers, pressing them to the large rib on the inner ring. Metric and inch series are considered standard and both systems are widely used. The inner ring, rollers and cage can be separated as a unit, or the CONE, from the outer ring, or the CUP. The cup and cone are called sub-units. Sub-unit dimensions for the nominal cup small inside diameter and bearing contact angle, as shown in Fig. 2, are standardized by ISO and ABMA and are compatible between sub-units. Double row and four row bearings are available in addition to single row bearings. Models and characteristics are shown in Tables 1 and 2. Sub-unit dimensions 2α E E : Cup small inside diameter, nominal α : Bearing contact angle, nominal Fig.1 Fig.2 Table 1 Structure and characteristics of double row tapered roller bearings Model Drawing Nominal number Characteristics Double row with vertex of contact angles outside of the bearing 413XXX 423XXX 430XXX 432XXX CRI ¡These bearings are designed with one double row outer ring and two pairs of inner rings with rollers. Bearings are adjusted so that their internal clearance becomes the specified value, the parts which have the same serial numbers should be assembled according to the assembly codes. ¡These bearings support radial and axial loads. Since the cone pressure apex is wide, bearings are suitable where moment loads are applied. ¡These bearings have the same function as the back-to-back duplex arrangement of single row bearings. Double row with vertex of contact steep angles outside of the bearing CRI ¡This bearing model has a larger and steeper contact angle than the double row with vertex of contact angles outside the bearing. These bearings are used when the axial load is large. ¡Since these bearings are adjusted so that the internal clearance is a specified value (like the double row with vertex of contact angles outside of bearing) the parts which have the same serial numbers should be assembled according to the assembly codes. Double row with vertex of contact angles inside of the bearing 3230XX 3231XX CRD ¡ These bearings are designed with one double row inner ring with rollers and two pairs of outer rings and an outer ring spacer. ¡ These bearings accept the radial and axial loads. Since the cone pressure apex is short, bearings are not suitable when the moment is applied. ¡Since these bearings are adjusted so that the internal clearance is the specified value (like the double row with vertex of contact angles outside of bearing) the parts which have the same serial numbers should be assembled according to the assembly codes. Double row with vertex of contact steep angles inside of the bearing CRD ¡ This bearing model has a larger and steeper contact angle than the double row with vertex of contact angles inside the bearing. These bearings are used when the axial load is large or only axials are applied. ¡ Models without an outer ring spacer and with a key groove or notch on the inner ring (refer to the drawing) are also available. Consult NTN Engineering about this bearing's fit. ¡ These bearings may be pressurized by using a spring between the housing shoulder and outer ring end. B-89
Tapered Roller Bearings Table 2 Structure and characteristics of the four row tapered roller bearings Model Drawing Nominal numbers Characteristics Four row tapered roller bearing 6259XX 6230XX 6231XX CRO ¡These bearings are designed with two double row inner rings with rollers, one double row outer ring, two single outer ring and outer ring spacer/inner ring spacer. Bearings are adjusted so that their internal clearance becomes the specified value, the parts which have the same serial numbers should be assembled according to the assembly codes. ¡The bearing is mainly used for the roll neck of rolling mill, and designed so as to become the maximum rating load for the allowable space in the roll neck part. ¡The bearing uses the clearance-fit to make assemble and disassembley easier. For this purpose, bearings are designed with a helical groove on the inner ring bore to prevent wearing of the inner ring bore when creep occurs and uses the carbonized steel to prevent cracks on inner ring and improve the shock resistance. ¡Please consult with NTN Engineering for fitting and bearing internal clearance. Four row tapered roller bearing enclosed type CROLL ¡Bearings are designed with oil seals on both side of the bearing which is the same as the four row tapered roller bearings. ¡Please consult with NTN Engineering for fitting and bearing internal clearance. 2. Dimensional Accuracy/Rotation Accuracy Metric system bearings ⋯⋯⋯Table 3.4 (Page A-14) Inch system bearings ⋯⋯⋯⋯Table 3.5 (Page A-16) 3. Recommended Fitting Metric system bearings ⋯⋯⋯Table 4.2 (Page A-24) Inch system bearings ⋯⋯⋯⋯Table 4.5, 4.6 (Page A-27) 5. General Operating Cautions Slippage between the balls and raceways may occur when bearings are operated under small loads, or when the ratio between axial and radial loads of the duplexed bearings exceeds the value “e,” and may cause smearing. This is most apparent when using large size tapered roller bearings due to the large cage mass. Please consult NTN Engineering for further details. 4. Bearing Internal Clearance Metric system bearings ⋯⋯⋯Table 5.7 (Page A-32) Inch system bearings ⋯⋯⋯⋯Table 5.9 (Page A-34) B-90
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For New Technology Network R corpor
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Warranty NTN warrants, to the origi
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A-2
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A-4
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Load Rating and Life n min -1 60,00
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Bearing Load Calculation 2. Bearing
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A-10A-30
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Bearing Tolerances Table 3.3 Tolera
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Bearing Tolerances 3.2 Limits and t
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Bearing Fits 4. Bearing Fits 4.1 In
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Bearing Fits (3) Consideration must
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Bearing Fits Table 4.3 Standard fit
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Bearing Fits Table 4.6 Fits for inc
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Bearing Internal Clearance (1) Redu
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Bearing Internal Clearance Table 5.
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Lubrication 6. Lubrication 6.1 Lubr
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Lubrication 6.3.2 Base oil Natural
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Lubrication 6.5 Oil lubrication Oil
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Lubrication Table 6.9 Factor K Expe
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MEMO A-46
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INDEX OF BEARING TABLES Deep Groove
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Deep Groove Ball Bearings
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Deep Groove Ball Bearings D r B r d
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Deep Groove Ball Bearings r D B r d
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Angular Contact Ball Bearings
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Angular Contact Ball Bearings 1. 2
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Angular Contact Ball Bearings Singl
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Double Row Angular Contact Ball Bea
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Double Row Angular Contact Ball Bea
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Cylindrical Roller Bearings
Page 87 and 88: Cylindrical Roller Bearings Table 3
Page 89 and 90: Single Row Cylindrical Roller Beari
Page 105 and 106: Multi-Row Cylindrical Roller Bearin
Page 113 and 114: 4-Row Cylindrical Roller Bearings C
Page 129 and 130: SL Type Cylindrical Roller Bearings
Page 137: Tapered Roller bearings
Page 141 and 142: Tapered Roller Bearings Inch system
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Page 145 and 146: Single Row Tapered Roller Bearings
Page 173 and 174: Double Row Tapered Roller Bearings
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Double Row Tapered Roller Bearings
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Double Row Steep Slope Tapered Roll
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Four Row Tapered Roller Bearings C2
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Sealed Four Row Tapered Roller Bear
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Spherical Roller bearings
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Spherical Roller Bearings 2. Dimens
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Spherical Roller Bearings B r r D d
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Thrust bearings
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Thrust Bearings 1. 3 Tapered roller
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Thrust Bearings d1 d D1 D r r T da
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Thrust Bearings d1 d D1 D r r T da
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Thrust Roller Bearings r d1 d D D1
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Thrust Roller Bearings r d1 d T r D
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Thrust Roller Bearings r d1 d T r D
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Tapered Roller Thrust Bearings (Sin
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Tapered Roller Thrust Bearings (Sin
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Tapered Roller Thrust Bearings (Dou
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Self-Aligning Thrust Roller Bearing
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Bearings for special applications C
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Split Cylindrical Roller Bearings:
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Double-Fractured Split Cylindrical
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Bearings for Preparing Rolls: Sendz
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Enclosed-Type Tapered Roller Bearin
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Tapered Roller Thrust Bearings: Scr
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Tapered Roller Thrust Bearings: Scr
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Tension Leveler Roll Unit: Cartridg
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Turn Table Bearings: 3-Row Cylindri
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Sealed Spherical Roller Bearings: M
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Spherical Surface Slide Bearings ¡
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Catalog List & Appendix Table
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Catalog List CATALOG TITLES CATALOG
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Appendix Table D-5 Appendix table 1
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Appendix Table Appendix table 2: Co
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Appendix Table h4 h5 h6 h7 h8 h9 h1
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Appendix Table H7 H8 H9 H10 H11 H13
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Appendix Table Appendix table 8: Vi
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D-15 1/64 1/32 3/64 1/16 5/64 3/32
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NTN - Large Bearings

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