Double row cylindrical roller bearings are designed to accommodate high radial loads in combination with high speeds. Having three flanges on the outer ring and no flanges on the inner ring, NNU design bearings can accommodate axial displacement in both directions. An important feature is the separable design, which facilitates mounting and enables the bearing components to be interchanged.
| Design variant/feature | NNU.5/C3 |
| d | 300 mm | Bore diameter |
|---|---|---|
| D | 460 mm | Outside diameter |
| B | 180 mm | Overall bearing width |
| D1 | ≈ 407 mm | Shoulder diameter outer ring |
| F | 339 mm | Raceway diameter inner ring |
| r1,2 | min. 4 mm | Chamfer dimension outer ring |
| r3,4 | min. 4 mm | Chamfer dimension inner ring |
| s | max. 4.9 mm | Permissible axial displacement from the normal position of one bearing ring relative to the other |
| da | min. 316 mm | Abutment diameter spacer sleeve |
|---|---|---|
| da | max. 334 mm | Abutment diameter spacer sleeve |
| db | min. 343 mm | Abutment diameter shaft |
| Da | max. 444 mm | Abutment diameter spacer sleeve / housing |
| ra | max. 3 mm | Fillet radius |
| rb | max. 3 mm | Fillet radius |
| Basic dynamic load rating | C | 2 600 kN |
|---|---|---|
| Basic static load rating | C0 | 5 500 kN |
| Fatigue load limit | Pu | 490 kN |
| Reference speed | 1 000 r/min | |
| Limiting speed | 1 500 r/min | |
| Calculation factor | kr | 0.38 |
General bearing specifications
Bearing interfaces
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