Fig. 4
Fig. 5
The SKF ConCentra
ball bearing
The bearings used in SKF ConCentra ball
bearing units are based on SKF Y-bearings
in YSP 2 SB series. These bearings have a
convex sphered outside surface. The inner
ring, which has precision engineered in-
clined serrations, is extended on both sides.
(† fig. 4).
The bearing is sealed on both sides with a
highly effective standard seal, which is
complemented by flingers to considerably
enhance the sealing effect without
increasing friction. The bearings are filled
with a premium grease with a lithium-
calcium thickener and mineral oil base. If
necessary, the bearing unit can be
relubricated via a grease fitting in the
housing.
The SKF ConCentra
stepped sleeve
The ConCentra stepped sleeve, a master-
piece of locking technology, is the real
innovation behind the SKF ConCentra
bearing († fig. 5). The locking concept is
based on two mating surfaces with preci-
sion-engineered inclined serrations ser-
rations. These mating surfaces respond to
axial displacement by expanding and con-
tracting evenly around the entire circum-
ference of the shaft. The stepped sleeve is
equipped with a mounting and pressure
ring († fig. 6).
By tightening the grub (set) screws in
the mounting ring, using the hexagonal
key (allen wrench), the pressure ring forces
the inner ring up the inclined planes of the
stepped sleeve to provide a true concentric
tight fit on the shaft († fig. 7).
SKF ConCentra locking technology ena-
bles a bearing to operate with maximum
reliability – improving both function and
service life.
Prior to installation
The two mating surfaces with precision-engi-
neered serrations in the bearing bore and on the
outside circumference of the sleeve are positioned
to provide clearance around the shaft
Fig. 6
During installation
The mating surfaces are axially displaced by tight-
ening the grub screws, which forces the bearing
ring to expand and the sleeve to contract, providing
a true concentric, tight friction joint with the shaft
Fig. 7
Mounting Kit (Instructions and hexago-
nal key equipped with torque indicator)
has to be order separately from the
bearings or units
[mounting kit designation = 626830]
A
5
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