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. The tapered bore enables accurate adjustment of clearance or preload during mounting.
| Bore type |
Tapered 1:12
|
| d |
300 mm
|
Bore diameter |
|---|---|---|
| D |
420 mm
|
Outside diameter |
| B |
118 mm
|
Width |
| D1 |
379 mm
|
Shoulder diameter outer ring (NNU design) |
| F |
339 mm
|
Raceway diameter inner ring (NNU design) |
| b |
16.7 mm
|
Width annular lubrication groove at outer ring |
| K |
3 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 3 mm
|
Chamfer dimension outer ring |
| r3,4 |
min. 1.1 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max. 5.5 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 313 mm
|
Abutment diameter shaft |
|---|---|---|
| da |
max. 335 mm
|
Abutment diameter shaft (NNU design) |
| Da |
max. 407 mm
|
Abutment diameter housing |
| ra |
max. 2.5 mm
|
Fillet radius |
| dn |
342 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
1 020 kN
|
|---|---|---|
| Basic static load rating | C0 |
2 360 kN
|
| Fatigue load limit | Pu |
224 kN
|
| Attainable speed for grease lubrication |
1 800 r/min
|
|
| Attainable speed for oil-air lubrication |
2 000 r/min
|
|
| Reference grease quantity | Gref |
420 cm³
|
| Mass bearing |
50 kg
|
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