Sub-Sahara Mining & Industrial Journal
Featured Industrial

New steel and heat treatment raises performance of bearings in wind turbine gearboxes

The SKF high durability gearbox bearing for wind raises the torque density in wind turbine gearboxes by reducing bearing and gear size up to 25% through an improved rating life while at the same time avoiding premature failures through improved robustness.

SKF has developed a new roller bearing for wind turbine gearboxes that offers bearing rating life at the forefront of the industry and enables reduction of downtime and maintenance.

The SKF high durability gearbox bearing for wind relies on a tailored combination of steel and heat treatment process that is developed to raise fatigue resistance and robustness. A thermochemical heat treatment process improves its surface and subsurface properties.

“The heat treatment process enriches the surface layer of the bearing components and improves the material strength both at and below the surface, covering the high stressed material volume during bearing operation”, says David Vaes, manager of the Wind Gearbox Competence Centre at SKF. “Rolling bearing performance very much depends on material parameters such as microstructure, residual stress and hardness.”

This tailored steel and heat treatment process has several benefits: it increases bearing rating life and enables downsizing; and increases the new bearings capacity to resists typical failure modes in gearboxes, such as premature failures related to White Etching Cracks (WECs), micropitting and wear.

Internal tests and calculations show up to a fivefold increase in bearing life compared to current industry standard. Moreover, an up to 10-times higher robustness against stress induced premature failures with WECs have been proven on inhouse test rigs.

The improved performance of SKF high durability gearbox bearings mean the bearings can be downsized, helping to increase torque density of the gearbox. This is critical in the latest generation of multi-megawatt turbines.

In a typical planetary stage of a 6MW wind turbine gearbox, a size reduction of the planet wheel bearing of up to 25 %, and consequently of the planet gear as well, is achievable by using SKF high durability gearbox bearing while keeping the same rating life as the industry standard bearing.

Similar size reductions can be achieved on different positions in the gearbox. In a parallel gear stage, the bearing size reduction will also reduce the risk of slip-related damages.

Resistance to typical failure modes could help gearbox manufacturers, turbine owners and service providers to increase reliability and have less unplanned turbine standstill and repair cost.

The new features helps to reduce the Levelized Cost of Energy (LCoE) for wind and supports the wind industry journey to become a cornerstone in the future energy mix.

SKF’s mission is to be the undisputed leader in the bearing business. We do this by offering solutions that reduce friction and CO2 emissions, whilst at the same time increasing machine uptime and performance. Our products and services around the rotating shaft, include bearings, seals, lubrication management, artificial intelligence and wireless condition monitoring. SKF is represented in more than 130 countries and has around 17,000 distributor locations worldwide. Annual sales in 2021 were SEK 81 732 million and the number of employees was 42,602.


® SKF is a registered trademark of the SKF Group.

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