Premier spherical roller bearings our vast experience

Technical information:
fundamentals
Internal clearance
reduction at installation
The bearing residual play must be controlled after
installation. This precaution is mandatory for tapered
bore bearings.
The relationship between axial displacement (a) in
a tapered bore bearing and the corresponding
reduction of its radial play Δ J r is as follows:
a
Taper 1/12: a = 12 Δ J r / t i
Taper 1/30: a = 30 Δ J r / t i
For more details,
refer to the installation section, page 29.
a
Δ J r
t i
Δ J r
= axial displacement
= radial play reduction
= clearance reduction rate on inner ring:
t i = 0.75 if the bearing is directly mounted on a solid shaft
taper journal.
t i = 0.7 if the bearing is mounted on a taper sleeve.
Installation & Adjustment
Periodic installation and removal causes modifications
to the geometrical tolerances and to the
shapes of the bearing housings and shafts. When
fitting a new bearing, the geometry must be carefully
checked; particularly at bearing housing and
W33 lubrication groove level where bearing housing
defects often occur in the groove, forming ridges on
the edge.
EF800 series (for vibrating or rotating load applications):
the following fits & adjustments are
recommended for new bearing housings:
- Tight fit at bearing housing: class P6.
- Slip fit at shaft level: class g6.
In this case, be careful before re-installing the bearings
in these worn housings.
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