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Wind

Rotor Shaft

Challenges

Highly-dynamic Loads

The ideal solution for every bearing support concept

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.

Separate Housings

Shaft Bearing Support

Separate housings - shaft bearing support
Separate housings – shaft bearing support

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.

FAG spherical roller bearing (non-locating bearing)

FAG spherical roller bearing (non-locating bearing)
Advantages
  • Long life
  • Suitable for high loads
  • Misalignments and shaft deflections are compensated
  • Simple to relubricate
Features
  • Adjusted internal clearance
  • Reduced friction
  • Solid brass cage

You can find standard spherical roller bearings for the non-locating bearing position in our GL1 catalog.

Optimized FAG spherical roller bearing (locating bearing)

Optimized FAG spherical roller bearing (locating bearing)

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.

Advantages
  • Reduced vibration in the drive train due to higher axial bearing rigidity
  • Increased robustness of bearings due to reduction parameters for contact pressure and wear
Features

Internal construction optimized for the application.

  • Adjusted internal clearance
  • Narrow osculation
  • Rigid central rib
  • Profiled rolling elements
  • X-life quality

FAG asymmetric spherical roller bearing (locating bearing)

FAG asymmetric spherical roller bearing (locating bearing)

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.

Advantages
  • Reduced vibration in the drive train due to even higher axial bearing rigidity
  • Increased robustness of bearings due to further reduction of parameters for contact pressure and wear
Features
  • Asymmetrical contact angle
  • Adjusted internal clearance
  • Narrow osculation
  • Profiled rolling elements
  • Rigid central rib

Customer-specific features for longer operating life

Customer-specific features for longer operating life

Customer-specific spherical roller bearings can also be provided with the following characteristics:

  • Durotect B for preventing white etching cracks
  • Triondur C for reducing wear under mixed friction conditions
  • Adjusted bore diameter for professional bearing replacement
  • Schaeffler Wind Power Standard for increased reliability
Common Housing

Hub Bearing Support

Common housing - hub bearing support
Common housing - hub bearing support

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.

Double-row FAG tapered roller bearing (locating bearing)

Double-row FAG tapered roller bearing (locating bearing)
Advantages
  • Long life
  • High operational safety and short mounting time due to preset internal clearance
  • Internal clearance and contact angle can be optimally adjusted
  • Narrow axial guidance of the rotor
  • Compact bearing design
  • High bearing load carrying capacity
  • High rigidity
Features
  • Internal construction optimized for the application
  • Preset internal clearance
  • Optimized internal geometry regarding wear and angular misalignment

FAG cylindrical roller bearing (non-locating bearing)

FAG cylindrical roller bearing (non-locating bearing)
Advantages
  • Ideal non-locating bearing: all axial movements occur inside the bearing without negatively influencing the bearing kinematics
  • High radial load carrying capacity
  • High radial rigidity
Features
  • Preset internal clearance
  • Optimized internal geometry regarding wear and angular misalignment

FAG tapered roller bearing (adjusted bearing version)

FAG tapered roller bearing (adjusted bearing version)
Advantages
  • Reduced weight
  • High rigidity
  • Narrow axial guidance of the rotor
Features
  • Compact bearing design
  • High bearing load carrying capacity
  • Contact angle can be optimally adjusted
Single Bearing Concept

Double-row Tapered Roller Bearing in an O Arrangement

Single bearing concept
Single bearing concept – double-row tapered roller bearing in an O arrangement

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.

FAG double-row tapered roller bearing (moment bearing)

FAG double-row tapered roller bearing (moment bearing)
Advantages
  • Long life
  • High operational safety and short mounting time due to preset internal clearance
  • Narrow axial guidance of the rotor
  • Compact power train design possible
Features
  • Double-row tapered roller bearing in O arrangement with large contact angle
  • All forces and moments are supported in one bearing
  • Optimum adjustment of the internal clearance and high moment support capacity at the same time
  • Preset internal clearance

Flange-mounted double-row FAG tapered roller bearing (flange bearing)

Flange-mounted double-row FAG tapered roller bearing (flange bearing)
Advantages
  • Long life
  • High operational safety and short mounting time due to preset internal clearance
  • Easy to mount preassembled unit
  • Narrow axial guidance of the rotor
  • Compact power train design possible
Features
  • Double-row tapered roller bearing in O arrangement with large contact angle
  • All forces and moments are supported in one bearing
  • Optimum adjustment of the internal clearance and high moment support capacity at the same time
  • Preassembled bearing unit (sealed and greased)
  • Components coated against corrosion
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