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Rolling bearings for wind power are subjected to various loads and requirements on the main components. The primary components include:
The bearing of the rotor shaft is of central importance. All forces generated by the wind act directly here. The rolling bearings are exposed to highly dynamic loads and operating conditions.
Generators in wind turbines are subjected to high vibration loads. This additional permanent stress particularly affects the cages and places high demands on the lubricant used.
Increasing megawatt capacities require larger and more powerful gearboxes. However, the operating conditions for rolling bearings in gearboxes of wind turbines cannot be compared to those in stationary gearboxes.
To meet the requirements for corrosion protection and wear reduction, so-called black oxide bearings are particularly used in wind turbines.
Black oxide bearings are rolling bearings coated with a thin, few-micrometer thick black iron oxide layer created by an alkaline process (usually according to DIN 50938). They offer enhanced corrosion resistance, optimized running-in properties, reduced wear, and protection against white-etching cracks (WEC).
Black oxide coating is a cost-effective measure to increase the reliability and service life of bearings under demanding operating conditions.
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