High-specification spherical roller bearings in wider range of sizes

Paul Boughton
Designed for heavy-duty, harsh operating environments and where there is a need to compensate for shaft misalignment, Schaeffler Group's range of X-life E1 spherical roller bearings are claimed to offer longer operating life, improved machine performance and higher reliability.
The E1 range - which is now being expanded to include eight bearing series with bore diameters from 20mm up to 1220mm - is suitable for a wide range of applications, including continuous casting machines used in steel processing, paper mills, wind turbine rotor shafts, and vibrating screens. The bearings are particularly suitable for applications where very high load carrying capacities and reliability are key design criteria.
For example, due to their robust design and high load capacity, E1 spherical roller bearings in Schaeffler's premium quality X-life rating can be specified for vibrating screens. The low-friction characteristics of the X-life E1 bearings not only withstands the very high alternating loads that occur in vibrating screens, but also help to reduce noise levels and operating temperatures, thereby improving machine efficiency.
In the larger-sized bearings with bore diameters greater than 320mm, the X-life E1 bearings benefit from having hardened sheet steel cages, which enable longer operating life due to significantly reduced wear.
Large-sized X-life spherical roller bearings are used as locating and non-locating bearings on equipment such as continuous casting machines used in steel processing.
Spherical roller bearings are double-row, self-contained units that comprise solid outer rings with a concave raceway, solid inner rings and barrel-shaped rollers with cages. The inner rings have cylindrical or tapered bores.
Many bearing sizes within the E1 spherical roller bearing range can now be converted to X-life quality. These bearings have no central rib on the inner ring and are therefore able to use longer rollers. Furthermore, the bearings benefit from improved kinematics, optimised surfaces and are made from higher-performance materials. As a result, the basic dynamic load rating and basic rating life (under similar operating conditions) are improved significantly. This means that in certain applications, a smaller bearing can be specified.
For the customer, these benefits translate into higher machine availability, new design possibilities, more economical bearing arrangements due to downsizing, and lower operating costs due to reduced energy consumption.
For more information, visit www.schaeffler.co.uk

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