Super-precision double row cylindrical roller bearings in the NNU 49 series are designed to accommodate heavy radial loads and high speeds, while providing a high degree of stiffness. Having three flanges on the outer ring and no flanges on the inner ring, the bearings can accommodate axial displacement in both directions. The separable design simplifies mounting and dismounting, particularly when load conditions require both rings to have an interference fit.
| Bore type |
Cylindrical
|
| d |
670 mm
|
Bore diameter |
|---|---|---|
| D |
900 mm
|
Outside diameter |
| B |
230 mm
|
Width |
| D1 |
821.2 mm
|
Shoulder diameter outer ring (NNU design) |
| F |
738 mm
|
Raceway diameter inner ring (NNU design) |
| b |
22.3 mm
|
Width annular lubrication groove at outer ring |
| K |
12 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 6 mm
|
Chamfer dimension outer ring |
| s |
max. 6 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 693 mm
|
Abutment diameter shaft |
|---|---|---|
| da |
max. 732 mm
|
Abutment diameter shaft (NNU design) |
| db |
min. 744 mm
|
Abutment diameter shaft (NNU design; not for tapered bore) |
| Da |
max. 877 mm
|
Abutment diameter housing |
| ra |
max. 5 mm
|
Fillet radius |
| dn |
755.4 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
4 950 kN
|
|---|---|---|
| Basic static load rating | C0 |
13 700 kN
|
| Fatigue load limit | Pu |
930 kN
|
| Attainable speed for grease lubrication |
700 r/min
|
|
| Attainable speed for oil-air lubrication |
600 r/min
|
| Mass bearing |
410 kg
|
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