Magic potions for metal surfaces
A tanker must be called in to perform an oil change at the latest after 20,000 operating hours. Clean oil, on the other hand, significantly extends this interval.
Poor lubrication is the death sentence for any drive. Clouds of abrasion particles in gearbox oil, in particular, take their toll on mechanical components. Possible remedies are bypass filters, intelligent lubrication systems and harder surfaces.
The drive train of a wind turbine holds a number of mysteries which even scientists have not yet understood fully, let alone been able to explain. One phenomenon around which many theories have evolved is that of “white etching cracks” – or WEC for short. White etching here describes microstructural changes in the materials of antifriction bearings and their rollers. These changes occur under the surface and produce fine cracks, which in turn lead to premature failure of the bearing and bring the drive to a standstill.
This special wear phenomenon is presumably unrelated to classic roller bearing fatigue, because the damage can already occur after just one to three years of operation. The experts are agreed, however, that the cause is in some way connected with the lubrication and with dynamic processes in the nacelle. “The background is not yet fully understood. But WEC must definitely be taken seriously, because the failure of a roller bearing can be the starting point for considerable damage,” says Walter Holweger from Schaeffler Technologies. After all, these special bearings are used not only in gearboxes, but also in other elements of the drive train, the pitch system or the tower bearings. Depending on the size and purpose of the bearing, suitable replacement can cost up to
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