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SKF
Spherical Roller Bearings SKF 22228 CCK/W33
- Technical data
- Inner diameter
- 140 mm
- Outer diameter
- 250 mm
- Width
- 68 mm
- Material
- Standard bearing steel
- Seal
- None, open bearing
- Cage
- Sheet steel cage
- Clearance
- Normal radial clearance
- Running accuracy
- Dimensional accuracy PN, Running accuracy P5
- Bore
- Tapered bore (1:12)
- Outer ring
- Lubrication groove with lubrication holes on outer ring
- Version2
- Standard version
- Temperature range
- -30 to +200 °C
- Version
- Explorer
- Weight
- 13,5 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 2 | 30,65 € | 582,32 € |
| 3 | 61,30 € | 551,67 € |
Spherical Roller Bearings SKF 22228 CCK/W33
The SKF 22228 CCK/W33 self-aligning roller bearing, measuring 140x250x68 mm, compensates for misalignment through angular movement and accommodates high radial loads as well as axial loads in both directions.
The 22228 CCK/W33 self-aligning roller bearing is an open, double-row roller bearing in the SKF Explorer performance class. It features a tapered bore with a 1:12 taper and dimensions of 140 mm (inner diameter), 250 mm (outer diameter) and 68 mm (width). Manufactured from 100Cr6 rolling-bearing steel, the sheet-steel cage guides the barrel rollers with low friction. Thanks to the hollow spherical outer ring raceway, this roller bearing accommodates shaft misalignment whilst simultaneously withstanding heavy radial and moderate axial loads.
What is the 22228 CCK/W33 self-aligning roller bearing suitable for?
This self-aligning roller bearing is primarily used in demanding shaft mounting applications where shaft deflection or misalignment occurs. The internal geometry compensates for angular misalignment between the inner and outer rings without causing increased wear. As the bearing is designed for operating temperatures ranging from -30 to +200 degrees, it is suitable for demanding thermal operating conditions. Thanks to its open design, you can integrate it directly into existing circulating or grease lubrication systems.
What do the designations CCK, W33 and P5 mean for this bearing?
The suffix ‘K’ indicates a tapered bore with a 1:12 taper, which is usually fitted using a mounting or withdrawal sleeve. When slid onto the tapered seat, the standard radial bearing clearance can be precisely adjusted. The designation W33 indicates a circumferential lubrication groove with holes in the outer ring, which facilitates targeted relubrication. In addition, the running accuracy to Class P5 ensures smooth concentricity with standard dimensional accuracy PN.
What are the dimensions of the 22228 CCK/W33 self-aligning roller bearing?
This bearing has an inside diameter of 140 mm, an outside diameter of 250 mm and a width across flats of 68 mm. It has a tapered bore with a taper ratio of 1:12. These dimensions correspond to the standardised main dimensions for self-aligning roller bearings of this size and determine the required installation space within the machine housing.
What is the function of the lubrication groove with holes to W33 specifications?
The designation W33 denotes a ring-shaped groove and radial lubrication holes in the outer ring of the bearing. Lubricant flows directly into the interior via these channels, between the rows of rollers. This design facilitates continuous or periodic relubrication whilst the bearing is in operation and contributes to an even distribution of the lubricating film.
How is the bearing with a tapered bore fitted?
A bearing with a tapered inner bore (designation K) is mounted either directly onto a tapered shaft journal or onto a cylindrical shaft using a mounting or withdrawal sleeve. Axial movement along the tapered seat causes the inner ring to expand in a controlled manner, allowing you to precisely adjust the remaining radial clearance during assembly.
What advantages does tolerance class P5 offer in terms of running accuracy?
This design combines standard dimensional accuracy (PN) at the mating surfaces with increased running accuracy to Class P5. This results in lower radial and axial runout limits for the inner and outer rings during operation. The result is a smoother rotational motion, which reduces vibrations in the drivetrain and contributes to the smooth running of mechanical components.
What temperature ranges is the bearing designed for?
The open spherical roller bearing, made from standard rolling-bearing steel (100Cr6) with a sheet steel cage, is suitable for use in a temperature range of -30 to +200 degrees. As there are no integrated elastomer seals, no sealing material limits the thermal load capacity. However, the type of lubricant selected must be suited to the respective operating temperature.
Why is it an open bearing without a seal?
Open roller bearings do not come with integrated sealing washers as standard. They are suitable for installation environments where the machine housing provides a seal against dirt and moisture, or where oil circulation lubrication is used. The lubricant can circulate freely and be replenished via the W33 lubrication holes in the outer ring.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
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