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The rotor shaft bearing support is of central importance in wind turbines. This is where all the forces act that are induced by the wind. The rolling bearings are subjected to highly-dynamic loads and operating conditions. In partnership with customers, Schaeffler develops the most efficient bearing support for each case.
If locating and non-locating bearings are mounted in separate housings, only one type of bearing with an angular adjustment facility can be used due to assembly and manufacturing inaccuracies in addition to shaft deflection.
You can find standard spherical roller bearings for the non-locating bearing position in our GL1 catalog.
The locating bearing is subject to particularly high axial loads as a result of the wind forces. We have optimized our proven standard spherical roller bearings in order to better fulfill the specific requirements in the wind turbine.
Internal construction optimized for the application.
Asymmetric design for even higher axial load carrying capacity
In addition to the optimized internal geometry, we have consistently further developed the spherical roller bearing in order to increase the operating life in wind turbines. The axial load carrying capacity has been significantly increased thanks to an asymmetric bearing design. The asymmetric spherical roller bearing has a larger contact angle on the bearing row subject to axial loads and a smaller contact angle on the bearing row subject primarily to radial loads.
Customer-specific spherical roller bearings can also be provided with the following characteristics:
If the locating and non-locating bearings are placed in the same housing, the bearing positions can be very precisely matched to each other so that bearing types without an angular adjustment facility can also be used. The locating/non-locating bearing consists of a double-row tapered roller bearing and a cylindrical roller bearing. In the adjusted bearing version, two tapered roller bearings are mounted.
With the single bearing concept, the rotor is only supported by one double-row tapered roller bearing in an O arrangement that supports all forces and moments. The dimensions of the large-size bearing extend to over 400 mm in width and over 3,000 mm in outside diameter.