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Four point contact ball
bearings are single row having raceways that enable to accommodate axial loads
in both directions. They need lesser axial space and a two part inner ring.
This allows large number of balls to be incorporated and carry larger loads.
The bearings are separable type. They are designed to accommodate axial loads
and arranged as thrust bearings with radial clearance.
Physical Characteristics
Angular contact ball bearings have raceways in the inner and outer rings that
are displaced with respect to each other in the direction of the bearing axis.
Following table describes the characteristics of three types of angular contact
ball bearings:
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Type
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Characteristics
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Standard Type
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- Available in bearing
series 79, 70, 72, 72B, 73, and 73B.
- Contact angles: 30°and
40° (with B) available.
- Standard bearing cage
type differs depending on bearing no.
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High Speed Use
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- Available in bearing
series 78C, 79C, 70C, 72C, and 73C.
- Contact angles: 15°
- All bearing accuracies
JIS Class 5 or higher.
- Standard bearing cage
type differs depending on bearing no.
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Ultra High Speed Use
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- Available in bearing
series HSB9C, HSB0C, BNT0, and BNT2; all boundary dimensions agree with
JIS series dimensions.
- Contact angles: 15°;
HSB type HSB9 and HSB0: 15°and 30°.
- All bearing accuracies
JIS Class 5 or higher.
- BNT type internal
design can be altered; suitable for higher speed applications than high
speed use bearings.
- HSB series bearings
have smaller diameter of balls than high speed use type bearings, so
benefit by less torque for high precision, high speed applications.
- The inner ring bore
diameter and outer ring inner diameter of the HSB series have a ground
undercut on one side enabling easy oil flow.
- For even higher speed
applications, there is a bearing in this series equipped with ceramic
ball bearings.
- For standard cage
types refer to Table 4; molded resin cages are also available for some
varieties.
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