Fig. 3
Fig. 4
For metric SKF ConCentra ball bearing units,
the tolerances for the housing bore prevent
the bearing from moving (wandering) on its
seat without restricting its ability to com-
pensate for misalignment. Bearings for inch
shafts are mounted with a clearance fit in
the housing. To prevent the bearing from
moving (wandering) on its seat, the outer
ring is equipped with an anti-rotation pin
(† fig. 3).
Radial internal clearance
SKF ConCentra ball bearings are produced,
as standard, with radial internal clearance to
Group 3 according to ISO 9628:2006. The
clearance values are provided in table 2 and
are valid for un mounted bearings units
under zero mea suring load.
Speeds
SKF ConCentra ball bearings are designed
for a wide range of speeds. The speed
ratings are only limited by the permissible
circumferential speed of the seal lip on its
counter surface. The limiting speeds are
listed in the product tables.
Seals
SKF ConCentra ball bearings are supplied,
as standard, with rugged integral seals that
are inserted in recesses in the outer ring.
These seals consist of a pressed sheet steel
washer with a sealing lip made of acryloni-
trile-butadiene rubber (NBR) vulcanized to
its inner surface. The non-contact sheet
steel washer forms a narrow gap with the
cylindrical surface of the inner ring shoulder
and protects the land-riding seal against
coarse contaminants.
To enhance the sealing effect, plain sheet
steel flingers are added on the outboard side
of the integral seal († fig. 4). The flingers
have an interference fit on the inner ring to
considerably enhance the effectiveness of
the seal without increasing friction.
Housing Materials
The cast housings of SKF ConCentra ball
bearing units are manufactured from grey
cast iron EN-GJL HB195 in accordance with
EN 1561:1997.
Load carrying ability
SKF ConCentra ball bearing units are able to
withstand the same dynamic and static
loads as the SKF ConCentra ball bearings
they incorporate. These Y-bearing units can
also be used in applications where shock
loads or variable axial loads occur.
Anti-rotation pin
Seal design
05 06 23 41
07 08 28 46
09 10 30 51
11 13 38 61
1)
For example: bearings size 12 includes all bearings based on a YSP 212 SB bearing as YSP 212 SB-2F,
YSP 212-204 SB-2F, YSP 212-207 SB-2F
!
Warning!
Application Note
Because of their special properties, SKF
ConCentra ball bearing units are used in
applications in virtually every industry.
If however, they are to be used in an applica-
tion where health, safety, or the environment
is at risk, SKF recommends contacting the
SKF application engineering service during
the design phase.
This is also true for applications with high
speeds and where machine downtime can-
cause significant problems.
C
21
To Next Page
Loading...