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 |
| d | 380 mm | Bore diameter |
|---|---|---|
| D | 620 mm | Outside diameter |
| B | 243 mm | Overall bearing width |
| D1 | ≈ 550 mm | Shoulder diameter outer ring |
| F | 442 mm | Raceway diameter inner ring |
| r1,2 | min. 5 mm | Chamfer dimension outer ring |
| r3,4 | min. 5 mm | Chamfer dimension inner ring |
| s | max. 7.4 mm | Permissible axial displacement from the normal position of one bearing ring relative to the other |
| da | min. 400 mm | Abutment diameter spacer sleeve |
|---|---|---|
| da | max. 434 mm | Abutment diameter spacer sleeve |
| db | min. 447 mm | Abutment diameter shaft |
| Da | max. 600 mm | Abutment diameter spacer sleeve / housing |
| ra | max. 4 mm | Fillet radius |
| rb | max. 4 mm | Fillet radius |
| Basic dynamic load rating | C | 4 290 kN |
|---|---|---|
| Basic static load rating | C0 | 8 500 kN |
| Fatigue load limit | Pu | 680 kN |
| Reference speed | 850 r/min | |
| Limiting speed | 1 100 r/min | |
| Calculation factor | kr | 0.33 |
General bearing specifications
Bearing interfaces
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