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 |
220 mm
|
Bore diameter |
|---|---|---|
| D |
340 mm
|
Outside diameter |
| B |
90 mm
|
Width |
| d1 |
265.2 mm
|
Shoulder diameter inner ring (NN design) |
| E |
310 mm
|
Raceway diameter outer ring (NN design) |
| b |
15 mm
|
Width annular lubrication groove at outer ring |
| K |
7.5 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. 2 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 233 mm
|
Abutment diameter shaft |
|---|---|---|
| Da |
min. 313 mm
|
Abutment diameter housing |
| Da |
max. 327 mm
|
Abutment diameter housing |
| ra |
max. 2.5 mm
|
Fillet radius |
| dn |
302.4 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
809 kN
|
|---|---|---|
| Basic static load rating | C0 |
1 460 kN
|
| Fatigue load limit | Pu |
143 kN
|
| Attainable speed for grease lubrication |
2 400 r/min
|
|
| Attainable speed for oil-air lubrication |
2 800 r/min
|
|
| Reference grease quantity | Gref |
260 cm³
|
| Static radial stiffness (guideline value) |
4 700 N/µm
|
| Mass bearing |
28.2 kg
|
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