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 |
420 mm
|
Bore diameter |
|---|---|---|
| D |
560 mm
|
Outside diameter |
| B |
140 mm
|
Width |
| D1 |
510.5 mm
|
Shoulder diameter outer ring (NNU design) |
| F |
466 mm
|
Raceway diameter inner ring (NNU design) |
| b |
16.7 mm
|
Width annular lubrication groove at outer ring |
| K |
9 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 4 mm
|
Chamfer dimension outer ring |
| s |
max. 5.5 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 435 mm
|
Abutment diameter shaft |
|---|---|---|
| da |
max. 461 mm
|
Abutment diameter shaft (NNU design) |
| db |
min. 471 mm
|
Abutment diameter shaft (NNU design; not for tapered bore) |
| Da |
max. 544 mm
|
Abutment diameter housing |
| ra |
max. 3 mm
|
Fillet radius |
| dn |
468.8 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
1 510 kN
|
|---|---|---|
| Basic static load rating | C0 |
4 000 kN
|
| Fatigue load limit | Pu |
335 kN
|
| Attainable speed for grease lubrication |
1 200 r/min
|
|
| Attainable speed for oil-air lubrication |
1 400 r/min
|
| Mass bearing |
99 kg
|
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