Seals for wind power facilities

Depending on the location and time of year, temperatures in the gondola can fluctuate between -40°C and more than 40°C. In the area of the sealing point, the seal lip must even withstand higher temperatures. The grease and additives used to lubricate the drive unit are further stresses that can damage the material.

The seals developed by Freudenberg Sealing Technologies for wind turbines are made of nitrile butadiene rubber (NBR), a high-performance synthetic rubber. It not only exhibits high resistance to grease, oils and hydrocarbons but is insensitive to temperature fluctuations. It exhibits a favourable aging behaviour and low abrasive wear. The company says these qualities make it possible for the main bearing seals to permanently prevent lubricants from leaking from the bearing. They also ensure that dirt particles, sand and water condensation do not penetrate the bearing from the exterior.