Hybrid single row deep groove ball bearings for wind turbine generators are designed to meet the application requirements for electric generators in larger wind turbines. They have rings made of bearing steel and rolling elements made of bearing grade silicon nitride (Si3N4), which make the bearings electrically insulating. The silicon nitride rolling elements not only provide protection from electric current damage but also, when compared to same-sized bearings with steel rolling elements, provide enhanced bearing performance, extended bearing service life, higher speed capability, high wear-resistance, high bearing stiffness, reduced risk of smearing and false brinelling, and less sensitivity to temperature gradients, making them suitable for use in dificult conditions and contaminated environments.
| d |
170 mm
|
Bore diameter |
|---|---|---|
| D |
360 mm
|
Outside diameter |
| B |
72 mm
|
Width |
| d1 |
≈ 236.4 mm
|
Shoulder diameter inner ring |
| D1 |
≈ 294.7 mm
|
Shoulder diameter outer ring |
| r1,2 |
min. 4 mm
|
Chamfer dimension |
| da |
min. 187 mm
|
Abutment diameter shaft |
|---|---|---|
| Da |
max. 343 mm
|
Abutment diameter housing |
| ra |
max. 3 mm
|
Fillet radius |
| Basic dynamic load rating | C |
276 kN
|
|---|---|---|
| Basic static load rating | C0 |
290 kN
|
| Fatigue load limit | Pu |
5.6 kN
|
| Reference speed |
4 500 r/min
|
|
| Limiting speed |
2 800 r/min
|
|
| Calculation factor | kr |
0.03
|
| Calculation factor | f0 |
14.4
|
| Mass bearing |
30.2 kg
|
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