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 |
120 mm
|
Bore diameter |
|---|---|---|
| D |
165 mm
|
Outside diameter |
| B |
45 mm
|
Width |
| D1 |
150.5 mm
|
Shoulder diameter outer ring (NNU design) |
| F |
134.5 mm
|
Raceway diameter inner ring (NNU design) |
| b |
5.5 mm
|
Width annular lubrication groove at outer ring |
| K |
3 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 1.1 mm
|
Chamfer dimension outer ring |
| r3,4 |
min. 1.1 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max. 1.1 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 126 mm
|
Abutment diameter shaft |
|---|---|---|
| da |
max. 133 mm
|
Abutment diameter shaft (NNU design) |
| db |
min. 137 mm
|
Abutment diameter shaft (NNU design; not for tapered bore) |
| Da |
max. 158.5 mm
|
Abutment diameter housing |
| ra |
max. 1 mm
|
Fillet radius |
| dn |
135.8 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
176 kN
|
|---|---|---|
| Basic static load rating | C0 |
340 kN
|
| Fatigue load limit | Pu |
37.5 kN
|
| Attainable speed for grease lubrication |
4 800 r/min
|
|
| Attainable speed for oil-air lubrication |
5 300 r/min
|
|
| Reference grease quantity | Gref |
27 cm³
|
| Static radial stiffness (guideline value) |
3 140 N/µm
|
| Mass bearing |
2.8 kg
|
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