Page 667 - SKF-bearing-housings

Standard bearing unit design

Concentric locking technology
The locking concept is based on two sets of
inclined planes (serrations): one set in the
bearing bore, the other on the stepped sleeve.
When the grub (set) screws in the mounting
collar are tightened, the bearing is displaced
axially, forcing the inner ring to expand. This
does two things: it sets the correct internal
clearance within the bearing and it exerts
pressure on the stepped sleeve, forcing it to
contract around the circumference of the shaft
for a true concentric, tight fit († fig. 4). When
the bearing is displaced axially during mount-
ing, it also pushes against a wave spring. The
wave spring, which remains preloaded, facili-
tates removal of the unit.

Fig. 3 Fig. 4
SKF ConCentra locking mechanism

Grub (set) screw Wave spring
Back-up collar

16
Mounting collar Washer Stepped sleeve

663