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Social and
Environmental Report |
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News Release |
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News Release
June 25,2002
NSK Ltd.
Public Relations Department
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NSK Announces Development of EW & EM Series Cylindrical Roller Bearings |
NSK has succeeded in developing cylindrical roller bearings with highly functional standards of performance for the 21st century. These new bearings include cylindrical roller bearings with high-capacity pressed steel cages, and cylindrical roller bearings with high-capacity one-piece machined brass cages. NSK is marketing these products as the EW Series and the EM Series (3 patents issued overseas, 14 patents pending in Japan).
 In comparison to ball bearings, cylindrical roller bearings have a much higher load-carrying capacity. Compared to other types of roller bearings (tapered, spherical, etc.), cylindrical roller bearings can run at much higher operating speeds. This makes them ideal for a wide range of industrial applications, including steel mills, construction equipment, vibration machines, compressors, and medium to large-size motors.
There have been many challenges involving such bearings and issues related to bearing life, cage strength, and noise.
The response has been the manufacturing of many types of cylindrical roller bearings for each specific use. Recently, progress in analysis and manufacturing technology at NSK has combined original ideas with bearing design, giving birth to a new a cylindrical roller bearing with highly functional standards of performance for a large variety of applications: EW Series and EM Series. These new series of standardized cylindrical roller bearings are designed with new concepts, and are engineered to support the needs of every industrial field, while providing the specific characteristics as shown below:
- Longer life
By redesigning the bearing interior, the EW & EM Series are even more compatible with international standards and applications. Calculation life has been doubled in comparison with conventional bearings, in addition to an increase in the number of rollers.
- High strength cage
The pressed steel cage of the EW Series enjoys greater thickness (1.5 to 2 times thicker) when compared to conventional cages. In addition, NSK designed the cage to minimize burr, which has been a source of stress-related problems in the past. The machined brass cage of the EM series has adopted a one-piece design that is free of any rivets, and provides relief from stress that has traditionally been concentrated in the fillet radius of a cage pocket. Overall, cage strength has dramatically improved for both series.
- Low vibration, and less overall noise
Unlike conventional cages, the shape and design of the cage pockets of the EW & EM Series cages are extremely precise since there is no pressing after roller insertion. Thus, we were able to design the cage pocket with less free movement. Furthermore, the enhanced accuracy in roller position enables greater control, which helps minimize excess vibration. We have been able to cut vibration resulting in noise by about 30 to 50 percent for the EW Series, and make greater reductions of about 50 to 60 percent for the EM Series.
 The EW Series bearings are especially suitable for high temperature conditions where a smaller size of bearing is the standard and where the ET Series cannot meet customer needs. The EM Series bearings are much more suitable for medium and large motors where low running noise is required, or for speed reducers and vibration equipment where harsh operating conditions are the norm.
Another positive outcome of our EW, EM, and ET series is that we have been able to achieve greater production efficiency by utilizing the same outer rings, inner rings, and rollers for all three series of bearings.
Utilizing the latest in manufacturing technology, highly developed analysis technology, and stringent evaluation tests, NSK succeeded in the development of the EW Series and the EM Series. These series are high-strength bearings with superior rotating performance. NSK is positioning these cylindrical roller bearings with highly functional standards of performance as its flagship product of the 21st century, with expanded sales for a wide variety of fields and industries throughout the world.
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EW Series |
EM Series |
| Outside Diameter |
52 to 120 mm |
52 to 260 mm |
| Availability |
Total 55 types in basic bearing numbers |
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