NTN - Large Bearings

Thrust Bearings
1. 3 Tapered roller thrust bearings
These are thrust bearings using tapered rollers, and the
single type bearings have three types of housing washers.
One type is the housing raceway with a rib, the other one is
without a rib, and the third bearing is the full complement
roller type. Double type bearings are mainly used to support
axial loads on the roll neck of rolling mill. Machined cages
are used for cages.
Drawing 1
1. 4 Self-aligning thrust roller bearings
These bearings have a self-aligning nature using barrelshaped
rollers. The allowable aligning angle varies
depending on the bearing's dimension system, but it is 1-
2for normal loads. Cages are machined type and the guide
sleeve is on the axial housing raceway. Since the load
capacity for axial loads is high, these bearings can support a
certain amount of radial load in the instances that axial loads
are applied. However, it is necessary to use these bearing
where the load conditions meet Fr/Fa 0.55.
These bearings have some spots where lubricant
cannot enter such as the gap between the cage and
guide sleeve. It is necessary to use oil lubrication even
in low speed operation.
Drawing 2
Fig.5 Self-aligning thrust roller bearing
2. Dimensional Accuracy / Rotation Accuracy
Drawing 3
Fig.3 Tapered roller thrust bearings (Single type)
Thrust ball bearings ⋯⋯⋯⋯⋯⋯Table 3.6 (Page A-18)
Cylindrical roller thrust bearings ⋯⋯Table 3.6 (Page A-18)
Tapered roller thrust bearings⋯⋯Table 3.8 (Page A-19)
Self-aligning thrust roller bearings ⋯⋯Table 3.8 (Page A-19)
3. Recommended Fitting
Thrust ball bearings
Cylindrical roller thrust bearings
Tapered roller thrust bearings
Self-aligning thrust roller bearings
Table 4.3 (Page A-26)
4. General Operating Cautions
Fig.4 Tapered roller thrust bearings (Double type)
Thrust bearings need to load a certain amount of axial load
to prevent sliping between the rolling elements and axial
housing raceway. Please consult with NTN Engineering for
details.
B-228