Angular Contact Ball Bearings - Single Row - Regular

1 B 47B 46 Table 1 Standard Cages for Angular Contact ball Bearings ContactangleANGULAR Contact ball BEARINGSSINGLE-ROW AND MATCHEDANGULAR Contact ball BEARINGSBore Diameter 10 50mm B50 Bore Diameter 60 120mm B56 Bore Diameter 130 200mm B62 DOUBLE-ROW Angular CONTACTBore Diameter 10 85mm B66 ball BEARINGSFOUR-POINT Contact ball BEARINGSBore Diameter 30 200mm B68 DESIGN, TYPES, AND FEATURESSINGLE-ROW Angular Contact ball BEARINGSS ince these Bearings have a Contact angle, they can sustain significant axialloads in one direction together with radial loads.

2 Because of their design, whena radial load is applied, an axial force component is produced; therefore, twoopposed Bearings or a combination of more than two must be the rigidity of Single -row Angular Contact ball Bearings can beincreased by preloading, they are often used in the main spindles of machinetools, for which high running accuracy is required. (Refer to Chapter 10,Preload, Page A96).Usually, the cages for Angular Contact ball Bearings with a Contact angle of30 (Symbol A) or 40 (Symbol B) are in accordance with Table 1,butdepending on the application, machined synthetic resin cages or moldedpolyamide resin cages are also used.

3 The basic load ratings given in thebearing tables are based on the cage classification listed in Table the figures in the bearing tables (Pages B50 to B61; bearing borediameters of 10 to 120) show Bearings with Single -shoulder-type inner rings,both-shoulder-type Bearings are also available. Please consult NSKfor moredetailed addition, for Bearings with the same serial number, if the type of cagesare different, the number of balls may also be different. In such a case, theload rating will differ from the one listed in the bearing Contact ball Bearings with Contact angles of 15 (Symbol C) and25 (Symbol A5)

4 Are primarily for high precision or high speed applications,and machined brass or synthetic resin cages or molded polyamide cages maximum operating temperature of molded polyamide cages is 120 Steel CagesMachined Brass Cages79A5, C 7900 794070A7000 70187019 704070C 7000 702272A, B7200 72227224 724072C 7200 724073A, B7300 73207321 7340 FigureArrangementFeaturesB 49B 48 Table 2 Types and Features of Matched Angular Contact ball BearingsMATCHED Angular Contact ball BEARINGSThe types and features of matched Angular Contact ball Bearings are shownin Table Angular Contact ball BEARINGSThis is basically a back-to-back mounting of two Single -row angularcontact ball Bearings , but their inner and outer rings are each integrated intoone.

5 Axial loads in both directions can be sustained, and the capacity tosustain moments is good. This type is used as fixed-end cages are pressed Contact ball BEARINGSThe inner ring is split radially into two pieces. Their design allows onebearing to sustain significant axial loads in either Contact angle is 35 , so the axial load capacity is high. This type issuitable for carrying pure axial loads or combined loads where the axial loadsare cages are made of machined FOR USE OF Angular Contact BALLBEARINGSU nder severe operating conditions where the speed and temperature areclose to their limits, lubrication is marginal, vibration and moment loads areheavy, they may not be suitable, particularly for certain types of cages.

6 Insuch a case, please consult with if the load on Angular Contact ball Bearings becomes too small, or ifthe ratio of the axial and radial loads for matched Bearings exceeds e (eislisted in the Bearings tables) during operation, slippage occurs between theballs and raceways, which may result in smearing. Especially with largebearings since the weight of the balls and cage is high. If such loadconditions are expected, please consult with NSKfor selection of AND RUNNING ACCURACYSINGLE-ROW Angular Contact ball Bearings Table (Pages A60 to A63)MATCHED Angular Contact ball Bearings Table (Pages A60 to A63)DOUBLE-ROW Angular Contact ball Bearings Table (Pages A60 to A63)

7 FOUR-POINT Contact ball Bearings Table (Pages A60 to A63)RECOMMENDED FITSSINGLE-ROW Angular Contact ball Bearings Table (Page A84)Table (Page A85)MATCHED Angular Contact ball Bearings Table (Page A84)Table (Page A85)DOUBLE-ROW Angular Contact ball Bearings Table (Page A84)Table (Page A85)FOUR-POINT Contact ball Bearings Table (Page A84)Table (Page A85)INTERNAL CLEARANCESMATCHED Angular Contact ball Bearings Table 9.

8 17 (Page A94)Matched Angular Contact ball Bearings with precision better than P5areprimarily used in the main spindles of machine tools, so they are used with apreload for rigidity. For convenience of selection, internal clearances areadjusted to produce Very Light, Light, Medium, and Heavy Preloads. Theirfitting is also special. Concerning these matters, please refer to Tables (Pages A98 and A99).The clearance (or preload) of matched Bearings is obtained by axiallytightening a pair of Bearings till the side faces of their inner or outer rings arepressed against each Angular Contact ball BEARINGSFor the clearance in double-row Angular Contact ball Bearings , pleaseconsult with Contact ball Bearings Table (Page A94)

9 LIMITING SPEEDSIn cases of Single -row and matched Angular Contact ball Bearings , theLimiting speeds listed in the bearing table are for Bearings with machinedcage. For those with pressed cages, the listed speeds must be reduced by20%.The limiting speeds of Bearings with Contact angles of 15 (Symbol C) and25 (Symbol A5) are for Bearings with precision of P5 and better (withmachined synthetic-resin cages or molded polyamide cages).The limiting speeds listed in the bearing tables should be adjusteddepending on the bearing load conditions.

10 Also, higher speeds are attainableby making changes in the lubrication method, cage design, etc. Refer to PageA37 for detailed (DB)(Example)7208 A DBRadial loads and axial loads in both directionscan be the distance between the effective loadc entersa0i s bi g , t h i s t y p e is s u it a b le i fmoments are (DF)(Example)7208 B DFRadial loads and axial loads in both directionscan be with the DB Type, the distancebetween the effective load centers is small, sothe capacity to sustain moments is inferior tothe DB (DT)(Example)