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 |
200 mm
|
Bore diameter |
|---|---|---|
| D |
280 mm
|
Outside diameter |
| B |
80 mm
|
Width |
| D1 |
252.2 mm
|
Shoulder diameter outer ring (NNU design) |
| F |
225 mm
|
Raceway diameter inner ring (NNU design) |
| b |
11.1 mm
|
Width annular lubrication groove at outer ring |
| K |
3 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 2.1 mm
|
Chamfer dimension outer ring |
| r3,4 |
min. 2.1 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max. 3.7 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 211 mm
|
Abutment diameter shaft |
|---|---|---|
| da |
max. 222 mm
|
Abutment diameter shaft (NNU design) |
| db |
min. 228 mm
|
Abutment diameter shaft (NNU design; not for tapered bore) |
| Da |
max. 269 mm
|
Abutment diameter housing |
| ra |
max. 2 mm
|
Fillet radius |
| dn |
227 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
484 kN
|
|---|---|---|
| Basic static load rating | C0 |
1 040 kN
|
| Fatigue load limit | Pu |
106 kN
|
| Attainable speed for grease lubrication |
2 600 r/min
|
|
| Attainable speed for oil-air lubrication |
3 000 r/min
|
|
| Reference grease quantity | Gref |
117 cm³
|
| Static radial stiffness (guideline value) |
5 480 N/µm
|
| Mass bearing |
15 kg
|
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