Page 854 - Rollingbearings

10 CARB toroidal roller bearings
Free space on both Fig. 13 Fig. 14
sides of the bearing Free space to enable axial displacement Bearing rings mounted offset to accom-
modate shaft expansion
To enable axial displacement of the shaft
relative to the housing, free space must be
provided on both sides of the bearing as
C areq C areq
indicated in ig. 13 The value for the width of
this free space is based on:
• the value C (product table, page 856)
a
• the expected axial displacement of the
bearing rings from the central position
during operation
• the displacement of the rings caused by
misalignment
s 1
Calculating the free space required on
both sides of the bearing

C areq = C + 0,5 (s + β k B) Bearings on sleeves Appropriate bearing
a
1
housings
CARB bearings with a tapered bore can be
where mounted with:
B = bearing width [mm] SKF standard bearing housings are available
C = minimum width of space required on • an adapter sleeve on plain or stepped for most CARB bearings in the C 30, C 31,
a
both sides of the bearing [mm] shafts (ig. 15): C 22 and C 23 series
(product table) – Adapter sleeves are supplied complete The two common arrangements when
C areq = width of space required on both sides with a locking device using standard housings are:
of the bearing [mm] – Use appropriate SKF adapter sleeve
k = misalignment factor (product table) assemblies to prevent the locking device • CARB bearings with a tapered bore on an
1
s = relative axial displacement of rings, from interfering with the cage adapter sleeve and a plain shaft
e g thermal shaft expansion [mm] (product table, page 868) • CARB bearings with a cylindrical bore on a
β = misaligment [°] • a withdrawal sleeve on stepped shafts stepped shaft
(ig. 16)
The comprehensive assortment of SKF
Check axial displacement carefully, as it could bearing housings is provided online at
Offset mounting be that s (product table, page 856) cannot skf com/housings
1
be fully realized
Where considerable thermal changes in For additional information about sleeves,
shaft length are a possibility, the inner ring refer to Adapter sleeves, page 1065, and
can be mounted offset, relative to the outer Withdrawal sleeves, page 1087
10 ring, up to the axial displacement limit s or
1
s (ig. 11, page 850) in the direction oppos-
2
ite to the expected axial displacement
(ig. 14) The extended permissible axial dis-
placement is used, for example, in the
self-aligning bearing arrangements of dry-
ing cylinders in paper machines

852