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Angular Contact Ball Bearings Table 3 Duplex angular contact ball bearings types and characteristics Back-to-back duplex (DB) Face-to face duplex (DF) Tandem duplex (DT) Duplex type r r Characteristics ¡Can accommodate radial loads and axial loads in either direction. ¡Has a large distanceRbetween the acting load center of the bearing, and therefore a large momentary force load capacity. ¡Allowable misalignment angle is small. ¡Can accommodate radial loads and axial loads in either direction. ¡Has a smaller distanceRbetween the acting load center of the bearing, and therefore a smaller momentary force load capacity. ¡Has a larger allowable misalignment angle than back-to-back duplex type. ¡Can accommodate radial loads and single direction axial loads. ¡Axial loads are received by both bearings as a set, and therefore heavy axial loads can be accommodated. Note: 1. Duplex bearings are manufactured in a set to specified clearance and preload values, therefore they must be assembled together with identically numbered bearings and not mixed with other arrangements. 2. Triplex arrangements of angular contact bearings are also available. Consult NTN Engineering for details. 1.2 Four-point angular contact ball bearings Four-point angular contact ball bearings have a contact angle of 30˚ and inner rings which are separated in half. As shown in Diagram 2, when the inner and outer rings receive a radial load the ball bearings contact the inner and outer rings at four points. This construction enables a single bearing to accommodate axial loads from either direction, and when generally under a simple axial load or heavy axial load, the bearing functions in reliance on two contact points like ordinary bearings. Diagram 2. loads, axial loads in either direction, and have a high capacity for momentary loads as well. As shown in Diagram 3, sealed and shielded type double row angular contact ball bearings are also available. Standard loads vary from those of open type bearings. Flush ground "Flush ground" is the name given to the finishing method shown in Diagram 4 where the offset of the front and back faces of the bearing are ground to the same value. By doing this, a stated clearance or preload value can be achieved by using bearings with identical codes for these values, in other words by combining either DB or DF series bearings. DT series bearings can also be used in various arrangements to achieve uniform load distribution. All BNT type bearings are flush ground, but other angular contact ball bearing series are not. If it is necessary to flush grind any of these other bearings, please consult NTN Engineering. Offset B 1.3 Double row angular contact ball bearings Back face Front face The structure of double row angular contact ball bearings is designed by arranging two single row angular contact bearings back-to-back in duplex (DB) to form one united bearing with a contact angle of 30˚. These bearings are capable of accommodating radial Offset A Diagram 4. AB Open type Shielded type (ZZ) Non-contact sealed type (LLB) Contact sealed type (LLU) Diagram 3. B-42
Angular Contact Ball Bearings 2. Standard cage types Table 4 lists the standard cage types for angular contact ball bearings. For high speed use angular contact ball bearings, molded resin cages and machined cages are widely used. Table 4 Standard cages for angular contact ball bearings Type Bearing series Molded resin cage Pressed cage Machined cage Standard 79 70 72 73 72B 73B 79047913 70007024 7200 7222 7300 7322 7200B7222B 7300B7322B 7914 7026 7224 7324 7224B 7324B 7960 7040 7240 7340 7240B 7340B High speed use 78C 79C 70C 72C 73C 7904C7913C 7000C7024C 7200C7220C 7303C7312C 7805C 7834C 7914C 7934C 7026C 7040C 7221C 7240C 7300C 7302C 7313C 7340C Ultra high speed use BNT0 BNT2 HSB9C HSB0C HSB010CHSB032C BNT000 BNT009 BNT200 BNT209 HSB910C HSB934C HSB034C 4-point contact QJ2 QJ3 QJ208 QJ306 QJ224 QJ324 Double row 52 53 5200 5218 5302 5315 52195220 Note: 1. Standard cages for 5S-BNT and 5S-HSB type bearings are the same as cages for BNT and HSB type bearings. 2. Due to the material characteristics of molded resin cages, use at application temperatures in excess of 120 is not possible. B-43
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For New Technology Network R corpor
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Warranty NTN warrants, to the origi
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TECHNICAL DATA CONTENTS 1. Classifi
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Classification and Characteristics
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Bearing Selection Select bearing’
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Bearing Selection 2.3 Selection of
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Load Rating and Life 3. Load Rating
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Load Rating and Life where, Lna : A
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Bearing Load Calculation 4. Bearing
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Bearing Load Calculation 4.1.2 Chai
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Bearing Load Calculation 4.4 Equiva
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Bearing Load Calculation 4.5 Allowa
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Bearing Load Calculation Fr2 70 K
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Boundary Dimensions and Bearing Num
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Boundary Dimensions and Bearing Num
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Bearing Tolerances Table 6.3 Tolera
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Bearing Tolerances 6.2 Chamfer meas
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Bearing Tolerances 6.3 Bearing tole
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Bearing Fits 7.3.2 Recommended Fits
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Bearing Fits Table 7.2 (3) Housing
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Bearing Fits Table 7.5 Numeric valu
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Bearing Fits Table 7.6 Fits for inc
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Bearing Internal Clearance and Prel
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Allowable Speed 9. Allowable Speed
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Lubrication 11. Lubrication 11.1 Lu
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Lubrication (1) Base oil Natural mi
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Lubrication 11.4 Solid grease (For
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Lubrication Bearing operating Lubri
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External bearing sealing devices 12
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External bearing sealing devices Ty
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Bearing Materials 13.2 Cage materia
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Shaft and Housing Design 14.2 Beari
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Bearing Handling 15. Bearing Handli
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Bearing Handling a) Installation on
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Bearing Handling 15.4 Post installa
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Page 96 and 97: Bearing Damage and Corrective Measu
Page 98 and 99: Technical Data Axial displacement m
Page 100 and 101: Technical Data 17.4 Fitting surface
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Page 104 and 105: INDEX OF BEARING TABLES Deep Groove
Page 107 and 108: Deep Groove Ball Bearings Open type
Page 109 and 110: Deep Groove Ball Bearings bearing i
Page 111 and 112: Deep Groove Ball Bearings D D1 rN r
Page 123 and 124: Deep Groove Ball Bearings Equivalen
Page 129: Expansion Compensating Bearings Da
Page 132 and 133: Miniature and Extra Small Bearings
Page 134 and 135: Miniature and Extra Small Ball Bear
Page 143: Angular Contact Ball Bearings Angul
Page 147 and 148: Single and Duplex Arrangements Db r
Page 159 and 160: High Speed Single and Duplex Arrang
Page 167 and 168: Ultra-High Speed Angular Contact Ba
Page 169 and 170: B-67
Page 171 and 172: Ceramic Ball Angular Contact Ball B
Page 173 and 174: Four-Point Contact Ball Bearings QJ
Page 175 and 176: Double Row Angular Contact Ball Bea
Page 177: Double Row Angular Contact Ball Bea
Page 180 and 181: Self-Aligning Ball Bearings B r ra
Page 186 and 187: Adapters (for self-aligning ball be
Page 188 and 189: Adapters (for self-aligning ball be
Page 191 and 192: Cylindrical Roller Bearings Cylindr
Page 193 and 194: Cylindrical Roller Bearings 2. Stan
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Cylindrical Roller Bearings ra r1a
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L Type Loose Rib B2 B2 r1 r1 B1 d d
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L Type Loose Rib B2 B2 r1 r1 B1 d d
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Multi-Row Cylindrical Roller Bearin
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Four-Row Cylindrical Roller Bearing
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Tapered Roller Bearings Table 1 (co
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Tapered Roller Bearings Inch Tapere
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Tapered Roller Bearings Inch Tapere
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Tapered Roller Bearings Metric syst
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Tapered Roller Bearings Inch system
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Multi-Row Tapered Roller Bearings O
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Multi-Row Tapered Roller Bearings I
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Multi-Row Tapered Roller Bearings I
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Four Row Tapered Roller Bearings C2
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Spherical Roller Bearings 1. Types,
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Spherical Roller Bearings 5. Adapte
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Spherical Roller Bearings ra Da ra
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Adapter (For spherical roller beari
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Adapter (For spherical roller beari
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Withdrawal Sleeves (For spherical r
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Double Row Angular Contact Thrust B
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Double Row Angular Contact Thrust B
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High Speed Duplex Angular Contact T
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High Speed Duplex Angular Contact T
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Self-Aligning Roller Thrust Bearing
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Locknuts, Lockwashers & Lockplates
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Locknuts Reference withdrawal sleev
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Locknuts Reference bore no. 3 locko
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Nuts Reference withdrawal sleeve no
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Lockwashers Series AW ƒ r2 B2 ƒ1
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Lockwashers Series AWL ƒ r2 B2 ƒ
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Catalog List & Appendix Table
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Catalog List CATALOG TITLES CATALOG
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Appendix Table SI-customary unit co
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