BEARINGS PRODUCTION RANGE

Spherical roller bearings
RKB spherical roller bearings are self-aligning and consequently insensitive to the misalignment of the shaft
relative to the housing and insensitive to shaft deflection or bending. The permissible value is up to 3.5°
approximately depending on bearing series and size.
These bearings have two rows of rollers with sphered raceway in the outer ring and two inner ring raceways
inclined at the proper angle to the bearing axis.
Used to operate in arduous conditions, leading in design, RKB spherical roller bearings can accommodate,
in addition to high radial loads, axial loads acting in both directions.
The production range of RKB spherical roller bearings comprises open bearings, sealed bearings (suffix
2CZ1) and bearings for vibratory applications (suffix ROVS).
Besides, RKB offers spherical roller bearings customized for specific applications, as, for instance, bearings
with split outer ring for higher permissible misalignment (suffix WOR) or with increased width dimension and
consequent larger rollers for milling applications (project designation SRB) or for the support of the rolls of
cold rolling Pilger mills for tubes.
RKB program includes the spherical roller bearings with both cylindrical and tapered bore (1:12 or 1:30
depending on series). Tapered bore bearings can either be mounted on tapered shaft seats or with sleeve
on cylindrical shafts.
Limiting load may result in lubrication problems, specially in the case of large bearings. So such bearings are
provided with annular groove and lubrication holes in the outer and/or in the inner ring (suffix W33, W33X,
W20, W26 etc.).
Depending on the bearing series, size and/or application, RKB spherical roller bearings are manufactured in
different constructive internal design versions (e.g. CA, MB, MF, CC etc.).
RKB small and medium size spherical roller bearings are usually fitted with pressed steel cage or one-piece
machined brass cage where the bearings have a central guide rib on the inner ring and symmetrical rollers
with large dimensions for increased carrying capacity.
The bearings of normal design, with a central fixed rib, are fitted with machined brass or steel cage guided
on the rollers or on the inner ring or outer ring raceway.
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