Separable Bearings for Wind Turbine Gearboxes

SKF has introduced its separable high-capacity cylindrical roller bearings to support high-speed shafts in wind turbine gearboxes. Equipment manufacturers can add advanced technology and increase system reliability by incorporating these bearings within gearboxes and turbine units, the company said. For wind farm owners and operators, the ability to reduce gearbox failures and turbine downtime can minimise operating and maintenance costs, helping to lower cost per kWh and increase profitability.

The separable high-capacity cylindrical roller bearings from SKF combine the advantages of conventional cylindrical roller bearings and SKF high-capacity cylindrical roller bearings. They are sized to match standard original bearings, yet feature extra rollers for increased load-carrying capacity. In addition, they offer the ability to separate the inner ring from the rest of the bearing components without the risk of the rollers becoming disengaged. Conventional bearings used to handle minimal load conditions and quick acceleration and deceleration can suffer smearing due to high levels of wear, potentially leading to bearing failure.

To minimise this risk, the design of the SKF separable high-capacity cylindrical roller bearings has been optimised, with an inner-ring cage guidance mechanism and a lower-weight brass cage for low inertia of the roller set. In addition, the use of black-oxidised rollers is said to improve running-in behaviour and prevents oil film build-up to ensure more stable running conditions. The separable bearing design also enables easy mounting and dismounting, according to SKF. This helps to reduce replacement and maintenance times during top-of-turbine repairs.

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