CONTACT
White Etching Cracks
Innovative solutions for preventing white etching cracks (WEC)

Schaeffler has comprehensive testing facilities for creating white etching cracks, analyzing the causes, and developing solution concepts for reducing the risk of white etching cracks.

"Innovative solutions for preventing white etching cracks" video

"Fighting White Etching Cracks" story

 
Cylindrical roller bearings
Cylindrical roller bearings with optimized rib contact (TB design)

Cylindrical roller bearings with optimized rib contact (TB design)
Schaeffler developed the TB roller to significantly increase the bearing operating life under axial load.
Cylindrical roller bearings with optimized rib contact

 
Solid brass cage
New solid brass cage (MPAX) for cylindrical roller bearings

New solid brass cage (MPAX) for cylindrical roller bearings
The MPAX solid brass cage has greater durability with regard to shock loads and vibrations than its predecessors and is especially well suited for applications involving high loads.
MPAX solid brass cage

 
X-life
X-life is the seal of quality for ultra-high performance products of the brands INA and FAG.

X-life is the seal of quality for ultra-high performance products of the brands INA and FAG.
X-life products

 
PUBLICATIONS
 

Brochure | 2013-07
Bearing Solutions and Services for Wind Turbine Gearboxes

 
 
PRESS

Enhanced performance in wind turbine gearboxes with bearing and system expertise

Schaeffler at EWEA 2015 in Hall P02-3

 
INTERACTIVE ANIMATION
Wind Power - Interactive Animation

Find information about Schaeffler products and services for rotor shafts, gearboxes, generators, wind tracking and blade adjustments.

"Wind Power" - interactive animation

 

Gearbox

The right bearing support for every gearbox  

Increasing megawatt ratings require larger and higher capacity gearboxes. The operating conditions for rolling bearings in wind turbine gearboxes cannot be compared with those for industrial gearboxes.

 
The right bearing support for every gearbox

Challenges for the bearing support

  • Highly-dynamic forces with extreme maximum and minimum loads
  • Sudden changes in load
  • Varying operating temperatures
  • Deformation of gearbox housing

Solution

  • Bearings with high static safety
  • Reliable dynamic dimensioning according to international design standards (AGMA 6006-A03, ISO 81400-4)
 
  PLANET CARRIER
Planet carrier

Planet carrier bearings are the largest and therefore most valuable bearings in a wind turbine gearbox. The loads they have to support depend on the main bearing concept selected. These bearings are usually subjected to relatively low loads due to their size.

 
 
 

Full complement INA X-life cylindrical roller bearing

 
Full complement INA X-life cylindrical roller bearing

Advantages

  • High load carrying capacity  
  • Long life  
  • High operational safety  
  • High axial load carrying capacity and reduced friction due to optimized rib contact  
  • Improved run-in behavior  
  • Increased protection against White Etching Cracks (WEC)
  • Increased guidance accuracy due to limited tolerances    
 
Full complement INA X-life cylindrical roller bearing

Features

  • Optimized rib contact
  • Durotect B coating
  • X-life quality
 

FAG tapered roller bearing

 
FAG tapered roller bearing

Advantages

  • Precise guidance of the gear teeth
  • Internal clearance can be precisely set  
  • No additional axial bearing necessary  
  • High axial forces can be accommodated by the large contact angle  
  • Improved run-in behavior
  • Increased protection against White Etching Cracks (WEC)
 
FAG tapered roller bearing

Features

  • Adjusted bearing arrangement
  • Durotect B coating
 
 
  PLANET GEAR
Planet gear

High loads within a small design envelope
Planet gear bearing supports are extremely challenging bearing positions because of the high radial loads that occur. Only a limited amount of space is available for this bearing support, and the planet gears, which have comparably thin walls, tend to distort leading to unintentional rotation of the bearing outer ring in the planet gear.

 
 
 

FAG cylindrical roller bearing (direct bearing support)

 
FAG cylindrical roller bearing (direct bearing support)

Advantages

  • High load carrying capacity
  • Long service life
  • High operational safety
  • Cost-effective design with low radial section height
  • No outer ring creeping
  • Improved run-in behavior
  • Increased protection against White Etching Cracks (WEC)
  • Optimum load distribution on the bearings
 
FAG cylindrical roller bearing (direct bearing support)

Features

  • Cylindrical roller bearing without outer ring
  • Raceway is integrated in the planet gear carrier  
  • Limited internal clearance
  • Durotect B coating  
  • X-life quality
 

FAG X-life high-capacity cylindrical roller bearing (direct bearing support)

 
FAG X-life high-capacity cylindrical roller bearing (direct bearing support)

Advantages

  • Low friction
  • Higher load rating due to optimized use of the design envelope
  • High stability
  • Lightweight design
  • Optimized lubricant flow
  • Improved run-in behavior due to Durotect B
  • High resistance to white etching cracks due to Durotect B
 
FAG X-life high-capacity cylindrical roller bearing (direct bearing support)

Features

  • Streamlined cage design
  • Cylindrical roller bearing without outer ring
  • Raceway is integrated in the planet gear carrier
  • Durotect B coating  
  • X-life quality
 
 
 
 
Close
 
 
Close
 
 
Close
 
 
  HOLLOW SHAFTS
Planet gear

Proven locating/non-locating bearing solutions
Bearing supports for hollow shafts support high radial loads as well as high axial loads in the case of planetary gears with helical gear teeth. Combinations of locating/non-locating bearing arrangements with two tapered roller bearings and one cylindrical roller bearing or two cylindrical roller bearings with one four point contact bearing with radial release have proven themselves in this application.

 
 
 

FAG cylindrical roller bearing

 
FAG cylindrical roller bearing

Advantages

  • Effective support of radial loads  
  • High operational safety
  • Easy assembly due to separability  
  • Low bearing friction
  • Suitability for high speeds  
  • Improved run-in behavior  
  • Increased protection against White Etching Cracks (WEC)  
  • Non-locating bearing function within the bearing is possible
 
FAG cylindrical roller bearing

Features

  • Non-locating bearing
  • Separable
  • Durotect B coating
  • X-life quality
 

FAG four point contact bearing

 
FAG four point contact bearing

Advantages

  • Effective support of axial loads
  • Favorable kinematics under axial loads in both directions  
  • Suitable for high speeds  
  • Low lubricant requirement  
  • Increased protection against White Etching Cracks (WEC)
 
FAG four point contact bearing

Features

  • Effective support of axial loads
  • Retaining slot in the outer ring for secure location
  • Durotect B coating
 
 
  INTERMEDIATE/OUTPUT SHAFT
Intermediate shaft / output shaft

High rotational speed
Intermediate shafts are used in single-stage planetary gearboxes in particular. A comparably small amount of space is available for the bearing support for the high radial loads and moderate axial loads that occur here. The output shaft rotates at high speeds.

 
 
 

Double-row FAG tapered roller bearing

 
Double-row FAG tapered roller bearing

Advantages

  • Long service life
  • High operational safety and short mounting time due to preset internal clearance
  • Effective support of radial and axial loads
  • Compact bearing design  
  • Increased protection against White Etching Cracks (WEC)
 
Double-row FAG tapered roller bearing

Features

  • Locating bearing  
  • Durotect B coating
 

FAG cylindrical roller bearing

 
FAG cylindrical roller bearing

Advantages

  • Effective support of radial loads
  • High operational safety  
  • Easy assembly due to separability  
  • Low bearing friction
  • Suitability for high speeds  
  • Improved run-in behavior  
  • Increased protection against White Etching Cracks (WEC)  
  • Non-locating bearing function within the bearing is possible
 
FAG cylindrical roller bearing

Features

  • Non-locating bearing
  • Separable
  • Durotect B coating
  • X-life quality
 
 
  PREFERRED SERIES

With its preferred series, Schaeffler offers a selection of gearbox bearings that have proven themselves in wind turbine gearboxes.

 
With its preferred series, Schaeffler offers a selection of gearbox bearings that have proven themselves in wind turbine gearboxes.

Advantages

  • Products that have already been validated
  • Faster development processes
  • Improved availability
  • Customers can make a preselection