On May 17, 2006, Nikkei BP reported that NTN had successfully developed a high-capacity cylindrical roller bearing designed for wind turbine speed increasers. This new bearing is capable of supporting both the output shaft and intermediate shaft, offering improved performance. By using a number of rollers similar to those in full-type roller bearings, the load capacity has been significantly increased, resulting in a rated life 1.5 times longer than that of traditional bearings with retainers.
Wind turbine speed increasers are typically located at high positions, making maintenance challenging. As a result, the bearings used in these systems must be highly reliable and capable of long-term operation. Moreover, as wind turbines have grown in size and power in recent years to enhance energy generation efficiency, there has been an increasing demand for bearings that can handle higher loads.
Previously, wind turbine generator input shafts used "cylinder roller bearings without cages." These bearings offered advantages such as a large number of rollers and extended service life compared to caged bearings. However, due to direct contact between adjacent rollers, they were prone to issues like meshing and abrasive wear, limiting their use to low-speed applications. Abrasive wear, caused by small scratches on the rolling surfaces, can significantly reduce bearing lifespan.
For medium and high-speed speed increasers, "cylindrical roller bearings with retainers" are commonly used on the output and intermediate shafts. While these bearings provide smooth rotation, they tend to have fewer rollers, which limits their ability to meet long-life requirements. To address this, NTN developed a new cylindrical roller bearing that maintains excellent rotational performance while increasing load capacity. This was achieved by replacing the original retainer with a newly designed "roller bearing race," resulting in a rated life 1.5 times that of the previous model.
Additionally, the design ensures that the rollers remain in place even when the inner ring is removed, allowing the inner and outer rings to be handled as separate components for easier installation. The bearing has dimensions of an inner diameter of φ120 mm, an outer diameter of φ260 mm, and a width of 86 mm. Beyond wind turbine speed increasers, it is also suitable for industrial transmissions and construction machinery, expanding its range of applications.
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