Spherical roller bearings are double-row, non-separable bearing. Their core structure features an outer ring with a spherical raceway combined with barrel-shaped rollers, which enables them to carry heavy load while providing self-aligning capability to compensate for shaft deflection or mounting misalignment.
Common Variants and Suffixes
CC / CA / E types: Different internal structural design. For example, CC type (pressed steel cage, floating center guide ring) and CA type (machined brass cage, inner ring with ribs) differ in cage and rib design; E type generally denotes an optimized internal design with improved load capacity.
K / K30: Tapered bore, with tapers of 1:12 and 1:30 respectively (the latter is mostly used for 240 and 241 series).
W33: Outer ring with lubrication groove and three lubrication holes.
Sealed types (e.g., CS / RS): One or both sides with contact seals, pre-filled with grease, suitable for application where maintenance is inconvenient.
Typical Application
Widely used in mining equipment (crusher, vibrating screen), papermaking machinery, reduction gear unit, rolling mill, and wind turbine main shaft—industrial fields where heavy load and risk of shaft deflection exist.
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The 222 series is a very widely used size range within spherical roller bearings. Its core feature is a relatively narrow cross-section combined with high load capacity, and the standard design has been developed into various variants to meet different mounting and operating condition requirements.
Core Structure and Design Feature
Basic structure: This series belongs to double-row non-separable bearings, with a spherical raceway on the outer ring, two raceways on the inner ring, and barrel-shaped rollers. The symmetrical barrel-shaped rollers can freely adjust their position within the spherical raceway of the outer ring to compensate for shaft bending or mounting misalignment.
E1 optimized design: Modern mainstream 222 series bearings (such as FAG's 222..-E1) mostly adopt a design without a center guide ring. This optimized design improves kinematic performance and raceway surfaces, uses high-performance materials, and can significantly increase the basic dynamic load rating and service life under the same operating conditions.
Bore Types and Variant Suffixes
Bore types: Available with cylindrical bore (no special marking or marked Z) and tapered bore (suffix K, taper 1:12). Tapered bore versions can be mounted with adapter sleeves or withdrawal sleeves, facilitating installation on plain shafts and clearance adjustment.
Cages: Depending on brand and model, common options include pressed steel cages (e.g., JPA), brass cages (e.g., M), or plastic cages (e.g., TVPA).
Seals and special variants: Sealed variants exist (e.g., 2RSR, 2VSR), as well as extra-wide sealed series designed for specific applications such as continuous casting machines (WS222...). In addition, split bearings (222S series) are available for applications where mounting is difficult.
Example Load and Performance Parameters
The 222 series covers a wide size range, with performance improving significantly as size increases. Taking two typical models as examples:
22220-E1 (bore 100 mm)
Basic dynamic load rating (Cr): 430,000 N
Basic static load rating (C0r): 475,000 N
Limiting speed (nG): 4,550 r/min (grease lubrication or specific conditions)
22222-E1 (bore 110 mm)
Basic dynamic load rating (Cr): 550,000 N
Basic static load rating (C0r): 600,000 N
Limiting speed (nG): 4,100 r/min
Temperature and Lubrication
Operating temperature: Standard bearings with metal cages are generally suitable for the range of -30°C to +200°C; if nylon cages or specific seals are used, the upper limit is correspondingly lower (e.g., 120°C or 100°C).
Lubrication: Open bearings typically have a lubrication groove and three lubrication holes on the outer ring to facilitate relubrication.
| Inquiry | Bearing No. | Boundary dimensions（mm） | Basic load ratings(kN) | Limiting speed(rpm ) | Mass | ||||
|---|---|---|---|---|---|---|---|---|---|
| d | D | B | Dynamic(Cr) | Static(Cor) | Grease | Oil | Kg | ||
