NSK introduces Roller Bearings for Large Gearboxes
Improved Reliability for large Gearboxes used in Wind Power Generators and other Industrial Machines
NSK Ltd. has developed a long-life, large-size Roller Bearing for large gearboxes. The key to the development was a combination of special heat treatment technology and material developed by NSK that provides excellent flaking resistance, including that of white structure flaking.
Development Background
Roller bearings that can support heavy loads are used in gearboxes* used in large industrial machines such as wind power generators, mining and construction equipment, and steelmaking equipment. In recent years, wind power generators have increased in size in order to generate more power. Also, mining and construction equipment and steelmaking equipment are used in very harsh conditions. Therefore, bearings used in the large gearboxes used for such applications must be highly reliable.
In response to these needs, NSK has developed large sized roller bearings that provide a high level of reliability through a combination of special heat treatment technology and material developed by NSK.
NSK was able satisfy the demand for greater performance in roller bearings for large gearboxes by combining special heat treatment technology and material developed by NSK. In particular, NSK has been able to decrease early damage by white structure flaking that leads to seven times service life longer than conventional bearing.
*Gearbox: A device made of many gears that is located between the input and output shafts and that is used to change the input RPM to the desired output RPM.
Product Benefits
The newly developed bearing is better than the conventional bearing as outlined below, for improved gearbox reliability in harsh usage environments.
White Structure Flaking Life: 7 times
Surface originated Flaking Life: 3 times
Subsurface originated Flaking Life: Twice
Fracture Toughness: Twice
Dimensional Change Rate: 1/50th
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