SKF - Rolling Bearings

9 CARB toroidal roller bearings
Designs and variants
CARB toroidal roller bearings († fig. 1) combine
the self-aligning capability of spherical
roller bearings with the axial displacement
ability of cylindrical roller bearings († fig. 2).
CARB bearings can also have the compact
cross section and high load carrying capacity
normally associated with needle roller
bearings.
CARB bearings are intended exclusively as
non-locating bearings. They can simplify
locating/non-locating bearing arrangements
because thermal elongation of the shaft can be
accommodated within the bearing virtually
without friction. Bearing systems consisting
of a spherical roller bearing in the locating
position and a CARB bearing in the non-locating
position († fig. 6, page 162) provide a spaceand
weight-saving bearing system with a low
cost of ownership. CARB bearings can reduce
noise and vibration levels, for example, in
paper machines and fans.
CARB bearings are single row bearings with
long, slightly barrel-shaped symmetrical rollers.
The outer ring has a torus-shaped raceway
with a profile radius extending beyond the
centre of the bearing. The inner ring raceway
is shaped accordingly. The rollers of CARB
Fig. 1
bearings are self-guiding, i.e. they always
adopt the pos ition where the load is favourably
distributed over the roller length, irrespective
of whether the bearing rings are misaligned or
axially displaced. The ability to distribute loads
favourably keeps the friction and frictional
heat at low levels. Lower operating temperatures
extend the service life of the lubricant
and the bearing.
More information
Bearing life and load ratings ...... 63
Design considerations ........... 159
Bearing systems ................. 160
Recommended fits ............... 169
Abutment and fillet dimensions ..... 208
Lubrication .................... 239
Mounting, dismounting and
bearing care ................... 271
Mounting instructions for individual
bearings .............† skf.com/mount
SKF bearing maintenance handbook
. . . . . . . . . . . . (ISBN 978-91-978966-4-1)
SKF Drive-up Method . † skf.com/drive-up
958