Super-precision double row cylindrical roller bearings in the NN 30 series provide a unique balance between load carrying capacity, rigidity and speed. Having three flanges on the inner ring and no flanges on the outer 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 |
320 mm
|
Bore diameter |
|---|---|---|
| D |
480 mm
|
Outside diameter |
| B |
121 mm
|
Width |
| d1 |
379 mm
|
Shoulder diameter inner ring (NN design) |
| E |
438 mm
|
Raceway diameter outer ring (NN 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 |
| r3,4 |
min. 6 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max. 8.9 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 335 mm
|
Abutment diameter shaft |
|---|---|---|
| Da |
min. 442 mm
|
Abutment diameter housing |
| Da |
max. 465 mm
|
Abutment diameter housing |
| ra |
max. 3 mm
|
Fillet radius |
| Basic dynamic load rating | C |
1 320 kN
|
|---|---|---|
| Basic static load rating | C0 |
2 600 kN
|
| Fatigue load limit | Pu |
240 kN
|
| Attainable speed for grease lubrication |
1 600 r/min
|
|
| Attainable speed for oil-air lubrication |
1 800 r/min
|
|
| Static radial stiffness (guideline value) |
6 540 N/µm
|
| Mass bearing |
73 kg
|
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