NTN - Large Bearings

Angular Contact Ball Bearings
1. Structure and Characteristics
1. 1 Single row angular contact ball bearings /
duplex angular contact ball bearings
A line connecting the contact points of both the ball and
inner ring and ball and outer ring forms an angle to a line
drawn radially: that angle is called the contact angle.
An angular contact ball bearing, while designed for radial
loads, can accommodate single direction axial loads. Under
radial loads and the resulting axial force component, the
bearings are generally used in a duplex arrangement. More
information on types and characteristics of duplexed angular
contact ball bearings is shown in Table 1.
Cage types and special features of single and multi–row
angular contact ball bearings are show in Fig.1. Drawings A
through F feature the inner ring guide cage. Drawings B
and C illustrate cages with lubrication ports. Drawings D
and E feature a rolling element guide cage: E also shows
the cage with a lubrication port. Note that the inner ring
width in drawing F is larger than that of the outer ring.
Table 1 Duplex angular contact ball bearings
Arrangement type
Characteristics
Back-to-back
duplex arrangement
(Code: DB)
Face-to-face
duplex arrangement
(Code: DF)
r
r
These bearings support
the radial loads and both
direction of axial loads.
¡Since the distance "l" between the cone pressure apexes of bearing is large,
the load capacity of the moment load is high.
¡Permissible slant angle is small.
¡The distance "l" between the cone pressure apexes of bearing is small in
comparison with the back-to-back duplex arrangement, the load capacity of
the moment load is low.
¡Permissible slant angle is larger than the back-to-back duplex arrangement type.
Notes: 1. Since the bearings are manufactured in a set to adjust for the internal clearance or pre-loading, parts with same serial number must be
used for assembly.
2. Combination of more than 3 bearings may occur. Please consult NTN Engineering for details.
A
B
C
D
E
F
Fig.1 Single row/duplex angular contact ball bearings
B-15