Product Description
Spherical roller bearings have two rows of symmetrical rollers, a common sphered outer ring raceway and two inner ring raceways inclined at an angle to the bearing axis (fig. 1) The centre point of the sphere in the outer ring raceway is at the bearing axis.
Bearing features
● Accommodate misalignment
Spherical roller bearings are self-aligning like self-aligning ball bearings or CARB bearings (fig. 2)
● High load carrying capacity
Spherical roller bearings are designed to accommodate both heavy radial loads and axial loads in both
directions
● Long service life
The rollers are manufactured to such tight dimensional and geometrical tolerances that they are
practically identical in a roller set. The symmetrical rollers self-adjust (fig. 3), providing optimal load
distribution along the roller length and together with the special profile prevent stress peaks at the
roller ends (fig. 4)
● Low friction
Self-guiding rollers keep friction and frictional heat at low levels (fig. 5). A floating guide ring guides
unloaded rollers so that they enter the load zone in the optimal position.
● Robust
All spherical roller bearings contain strong window- or prong-type cages.
Bearing design
Designs and variants
The assortment of spherical roller bearings is the widest available on the market. The standard assortment includes:
● CC design bearings
● CA and MB design bearings
● E design bearings
All spherical roller bearings are available with the option of a tapered bore. Depending on the bearing series, the tapered bore has:
● a taper 1:12 (designation sufix K)
● a taper 1:30 (designation sufix K30)
CC design bearings
● have two stamped window-type steel cages, an inner ring without Flanges and a floating guide ring
centred on the inner ring (fig. 6)
● are indicated in the product table by the designation suffix C or CC
● are indicated in the product table by the designation suffix EC or ECC for larger bearings and have an
optimized internal design for increased load carrying capacity
CA design bearings
● have a machined double prong-type brass cage, an inner ring with a retaining flange on both sides
and a floating guide ring centred on the inner ring (fig. 6)
The flanges on the inner ring are designed to keep the rollers in place when swivelling the bearing
during mounting or maintenance and are not designed to guide the rollers or accommodate any
axial load.
● are indicated in the product table by the designation suffix CA
● are indicated in the product table by the designation suffix ECA for larger bearings and have an
optimized internal design for increased load carrying capacity
E design bearings
● have two stamped window-type steel cages, an inner ring without flanges and a floating guide ring
centred on the inner ring (d ≤ 65 mm) or on the cages (d > 65 mm) (fig. 6)
● are indicated in the product table by the designation suffix E
● have an optimized internal design for increased load carrying capacity
Bearing on sleeve
Annular groove and lubrication holes
● CC and CA design bearings are available with an annular groove and three lubrication holes in the
outer ring (designation suffix W33) or three lubrication holes in the outer ring (designation sufix
W20) (fig. 7)
● E design bearings have an annular groove and three lubrication holes as standard (fig. 6). This feature
is not identified in the bearing designation (no designation suffix)
The seals are fitted in a recess on the outer ring and seal against the inner ring (fig. 8). On larger bearings,
the seals are fixed by a retaining ring (fig. 9)
Bearings on sleeves
Spherical roller bearings with a tapered bore can be mounted with:
● an adapter sleeve on plain or stepped shafts (fig. 10):
– NEWORLD adapter sleeves are supplied complete with a locking device
Alternatively, a spacer ring can be inserted between the bearing and the lock washer
● a withdrawal sleeve on stepped shafts (fig. 11)
Temperature limits
Temperature limits
The permissible operating temperature for spherical roller bearings can be limited by:
● the dimensional stability of the bearing rings
● the seals
● the lubricant
Where temperatures outside the permissible range are expected, contact NEWORLD
Bearing rings
NEWORLD spherical roller bearings undergo a special heat treatment The bearings are heat stabilized up to at least 200 °C (390 °F).
Seals
The permissible operating temperature for seals depends on the seal material:
● NBR: –40 to +90 °C (–40 to +195 °F)
Temperatures up to 120 °C (250 °F) can be tolerated for brief periods
● HNBR: –40 to +150 °C (–40 to +300 °F)
● FKM: –30 to +200 °C (–20 to +390 °F)
Typically, temperature peaks are at the seal lip
Application
Here are examples of applications in which spherical roller bearings might be used:
● Renewable energy
● Mining, mineral processing and cement
● Material handling
● Pulp & Paper
● Industrial transmission
● Metals
● Marine
● Power generation
● Gear drives and rolling mills
