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 |
190 mm
|
Bore diameter |
|---|---|---|
| D |
290 mm
|
Outside diameter |
| B |
75 mm
|
Width |
| d1 |
228.2 mm
|
Shoulder diameter inner ring (NN design) |
| E |
265 mm
|
Raceway diameter outer ring (NN design) |
| b |
11.35 mm
|
Width annular lubrication groove at outer ring |
| K |
6 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 2.1 mm
|
Chamfer dimension outer ring |
| r3,4 |
min. 1.1 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max. 3 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 201 mm
|
Abutment diameter shaft |
|---|---|---|
| Da |
min. 267 mm
|
Abutment diameter housing |
| Da |
max. 279 mm
|
Abutment diameter housing |
| ra |
max. 2 mm
|
Fillet radius |
| dn |
258.9 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
594 kN
|
|---|---|---|
| Basic static load rating | C0 |
1 080 kN
|
| Fatigue load limit | Pu |
108 kN
|
| Attainable speed for grease lubrication |
2 800 r/min
|
|
| Attainable speed for oil-air lubrication |
3 200 r/min
|
|
| Reference grease quantity | Gref |
144 cm³
|
| Static radial stiffness (guideline value) |
4 280 N/µm
|
| Mass bearing |
17.1 kg
|
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