Sealed Spherical Roller Bearing

In addition to the basic configurations consisting of an inner ring, an outer ring, rotating elements (two rows of rollers) and a cage, the sealed spherical roller bearings manufactured by KOMEL have sealing devices on both sides or one side of the bearing. The most common forms of insulation are contact seals (rubber seals including NBR butadiene nitrile rubber, FKM fluoride rubber, HNBR hydrated butadiene nitrile rubber, etc.) and non-contact seals (such as labyrinth seals). Contact seals prevent external dust, dirt, moisture, etc. from entering the core while preventing oil from leaking from the bearings. Non-contact seals, in accordance with the special design, create a labyrinth to prevent contamination and increase bearing friction.

Parameter (Specification)

Suffixes

Internal Design

BC: Bearings with a cast iron cage guided by the rollers, suitable for the main shafts of wind turbines.

CA/CAC: The inner ring has ribs on both sides, with a guide ring guided by the cage, and a machined brass cage.

CC(J)/CJ: The inner ring has no rib, with a guide ring guided by the cage, and two stamped steel cages.

CCJA/EJA: The inner ring has no rib, with a guide ring guided by the outer ring, and two stamped steel cages.

CAF: Similar to the CA type, but with a machined steel cage.

ECA/ECAC: Fork-shaped machined brass cage, the inner ring has ribs on both sides, with a guide ring guided by the inner ring and an enhanced roller set.

External Design (Seals, Snap Grooves, etc.)

-CS, -2CS: One side or both sides are equipped with contact NBR seals.

-CS2, -2CS2: One side or both sides are equipped with contact FKM seals.

-CS5, -2CS5: One side or both sides are equipped with contact HNBR seals.

-RS, -2RS: One side or both sides are equipped with contact NBR seals.

-RS5, -2RS5: One side or both sides are equipped with contact HNBR seals.

K: Tapered bore with a taper of 1:12.

K30: Tapered bore with a taper of 1:30.

Cage Design

F: Machined steel cage, guided by the inner ring.

FA: Machined steel cage, guided by the outer ring.

J: Stamped steel cage, guided by the inner ring.

JA: Stamped steel cage, guided by the outer ring.

MA: Machined brass cage, guided by the outer ring.

Material and Heat Treatment

235220: The inner ring is case-hardened, and the inner bore has a spiral groove.

HA3: The inner ring is case-hardened.

Precision, Clearance, Preload, and Quiet Operation

C08: The rotational accuracy meets the P5 tolerance grade.

C083: C08 + C3.

C084: C08 + C4.

C2: The radial internal clearance is smaller than the normal grade.

C3: The radial internal clearance is larger than the normal grade.

C4: The radial internal clearance is larger than C3.

C5: The radial internal clearance is larger than C4.

P5: The dimensional accuracy and rotational accuracy meet the P5 tolerance grade.

P6: The dimensional and rotational accuracy meet the P6 tolerance grade.

P62: P6 + C2.

Lubrication

GEM9: Filled with 70–100% of SKF LGHB 2 grease.

VT143: Filled with 25–45% of SKF LGEP 2 grease.

VT143C: Filled with 70–100% of SKF LGEP 2 grease.

W64: Solid oil.

W: The outer ring has no lubrication groove and lubrication holes.

W20: The outer ring has three lubrication holes.

W26: The inner ring has six lubrication holes.

W33: The outer ring has a lubrication groove and three lubrication holes.

W33X: The outer ring has a lubrication groove and six lubrication holes.

W77: Inserted W33 lubrication holes.

W513: W26 + W33.

Other Variants

R505: Bearings for railway axle boxes.

VA405: Bearings for vibrating machinery, with a case-hardened stamped steel cage.

VA406: Similar to VA405, but the inner bore of the cylindrical inner ring is coated with PTFE.

VA991: Bearings suitable for high-speed applications.

VE552(E): The outer ring on one side has three equidistant threaded holes for connecting lifting equipment. E indicates that the bearing is equipped with a lifting eye bolt.

VE553(E): Similar to VE552(E), but the outer ring on both sides has threaded holes.

VG114: Case-hardened stamped steel cage.

VQ424: The rotational accuracy is higher than C08.

Application

Mining Exploitation and Processing: In the mining environment, a large number of particulate matters such as dust and sediment exist. At the same time, equipment will generate relatively large vibration and impact loads during operation. Sealed spherical roller bearings are commonly used in equipment such as crushers, ball mills, vibrating screens, and belt conveyors. For example, in the main shaft part of a crusher, the sealed spherical roller bearing can withstand strong impacts and vibrations, prevent dust and crushed stone particles from entering the interior of the bearing, and ensure the stable operation of the crusher. In a ball mill, the bearing can bear heavy loads, and the sealing structure can avoid the intrusion of debris from the grinding media and materials, thus prolonging the service life of the bearing.

Metallurgical Industry: During the metallurgical production process, there are complex working conditions such as high temperature, metal debris, mill scale, and cooling liquids. Sealed spherical roller bearings are suitable for equipment such as rolling mills, continuous casting machines, blast furnace charging equipment, and steel conveyors. Taking a rolling mill as an example, the bearing needs to bear huge rolling forces and thermal stresses. The sealing structure can prevent mill scale, cooling liquids, and other impurities from entering, maintain a good lubrication state of the bearing, and ensure the precise rotation of the rolling rolls. The mold vibration devices and conveying roller tables of continuous casting machines also require such bearings to adapt to the working conditions of high temperature and heavy loads.

Construction and Engineering Machinery: Construction and engineering machinery such as excavators, loaders, cranes, bulldozers, and concrete mixers often operate in open-air environments with a lot of dust, as well as muddy and wet conditions. Sealed spherical roller bearings can be applied to the slewing mechanisms, hinge points of the boom and stick, wheel axles, and mixing shafts of these equipment. For instance, the slewing bearings of excavators use sealed spherical roller bearings, which can bear complex radial, axial, and overturning loads. At the same time, the sealing structure can prevent the intrusion of soil, sand, and water, ensuring the flexible rotation and reliability of the equipment.

Cement Production: Cement production equipment such as rotary kilns, raw material mills, cement mills, and powder separators have harsh working environments with a large amount of dust and heavy loads during operation. Sealed spherical roller bearings play a crucial role in these equipment. For example, in the supporting rollers and thrust rollers bearings of rotary kilns, the sealing structure can effectively block the entry of cement dust, bear the huge weight of the kiln body and the vibrations during operation, and ensure the stable operation of the rotary kiln. The main bearings of raw material mills and cement mills also rely on these bearings to bear heavy loads and prevent dust contamination.

Power Industry: In power plants, whether it is thermal power generation, hydropower generation, or wind power generation, there are equipment that use sealed spherical roller bearings. Such as coal pulverizers, fans, and feed water pumps in thermal power plants, water turbines and generators in hydropower plants, as well as the main shafts and yaw systems of wind turbines in wind power plants. Taking a wind turbine as an example, the main shaft bearing needs to bear huge axial and radial loads. The sealing structure of the sealed spherical roller bearing can prevent the intrusion of sand, wind, rainwater, and moisture, adapt to the harsh outdoor working environment, and ensure the reliable operation of the wind turbine.

Paper Industry: During the paper-making process, paper production equipment will come into contact with substances such as water, chemical agents, and fibers. Sealed spherical roller bearings can be used in parts such as the press section, drying section, and winders of paper machines. In the press section, the bearing needs to bear the pressure during paper pressing, and the sealing structure can prevent water and paper pulp fibers from entering, protecting the bearing from corrosion and wear. The bearings in the drying section need to withstand high temperatures and steam, and the sealing device can prevent the loss of lubricating grease and the intrusion of external impurities, ensuring the stable rotation of the drying rolls.