“Imagine how Henry Timken would delight in seeing the evolution of his tapered roller bearings to drive wind turbines, with outer diameters of nearly 3 meters (9 feet),” said Hans Landin, Timken’s director of process original equipment and wind energy. “The fundamental engineering of Timken’s UltraWind series is similar to the original. Yet the application - in a turbine erected high on a wind tower, in extreme conditions with unpredictable loads - demands a systems approach combining Timken® tapered roller bearings with integrated seals, lubrication and condition monitoring.”

With the highest life ratings in the industry verified by Germanischer Lloyd, the new UltraWind series of bearings provides a cost-conscious, simplified drivetrain for main-shaft wind turbine designs (both gear and gearless). For multi-megawatt turbines, the pre-loaded tapered roller bearing type is better suited than other bearing types to address concerns such as stresses, rigidity and load management that affect bearing life and reliability.

Timken’s UltraWind series of bearings provides superior stiffness to manage motion of the main shaft and rotor. Its bearing raceway profiles are designed to control maximum stress levels for enhanced durability and the cage is optimized for capacity and roller retention, including both steel and polymer configurations.

UltraWind is part of an integrated main-shaft system solution designed to customers’ specific operating requirements. In close collaboration with customers, Timken takes into account the total operation of the bearing and power-drive system to optimize the sustainable life of the equipment.

The UltraWind series of bearings is among a record number of Timken innovations for the wind-energy industry, which the company introduced as part of the 2010 Windpower Conference and Exhibition held in Dallas May 22-26. More information about Timken’s windpower capabilities is available online, including a complete media kit, at:


Animations illustrating the company’s wind-energy applications are available at:

About The Timken Company

The Timken Company (NYSE: TKR, http://www.timken.com) keeps the world turning with innovative friction management and power transmission products and services, enabling our customers’ machinery to perform more efficiently and reliably. With sales of $3.1 billion in 2009, operations in 26 countries/territories and approximately 17,000 employees, Timken is Where You Turn® for better performance.

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