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White Etching Cracks

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)
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
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 products

PUBLIKASJONER

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

Last ned (PDF, 1.00 MB)

All wind power related catalogs, publications, and brochures

All wind power related press releases

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.

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 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

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

Features

Optimized rib contact
Durotect B coating
X-life quality

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)

Features

Adjusted bearing arrangement
Durotect B coating

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)

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

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)

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

Features

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

Streamlined cage design
The high-capacity cylindrical roller bearing combines the advantages of both full complement bearings and cage type bearings due to the new streamlined cage design.

Downsizing possible
When fitted as a direct bearing support, the FAG high-capacity cylindrical roller bearing in X-life quality allows significantly improved use of the design envelope compared to a comparable standard bearing support.

Standard bearing

FAG high-capacity cylindrical roller bearing
-> 45 % less weight for the planet gear with the same bearing life

HOLLOW SHAFTS

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

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

Features

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

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)

Features

Effective support of axial loads
Retaining slot in the outer ring for secure location
Durotect B coating

INTERMEDIATE/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

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)

Features

Locating bearing
Durotect B coating

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

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.

Advantages

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