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Schaeffler is successively introducing new rolling elements in all 241-series spherical roller bearings in X-life quality with bore diameters of 500 mm and above. The new barrel rollers are characterised by their end profiling, an optimised microgeometry on the ends of the rollers. This enhancement makes them significantly more robust in use.

While spherical roller bearings with non-profiled rollers show material wear due to friction after a short operating time, the edge pressure caused by abrasive material wear is at least 20 percent lower on bearings with profiled rollers.

The operational reliability and operating life are significantly increased, particularly in mining and processing applications. Schaeffler is setting the new standard for catalog bearings with its large-size bearings featuring rollers with end profiling.

Profiling Of Rolling Elements Provides Significant Benefits

Profiled rollers offer decisive design advantages compared to rollers without profiling. On profiled rollers, the amount of material on the outside surface of the roller radius is reduced logarithmically. In new condition, profiled rollers are therefore not subject to the risk of edge pressures developing at their ends when under high loads. Under regular operating conditions, edge pressure caused by the abrasive material wear occurs significantly later and is at least 20 percent lower compared with non-profiled rollers. The operating life is increased by up to 15 percent. The customer benefits from increased operational reliability and machine availability as a result of the increased wear resistance.

Target Markets: The Cement And Mining Sectors

Their use in roller presses – which are primarily used as grinding mills for cement and raw materials but also find use in the mining industry – offers a lot of potential. These applications involve high loads and rough ambient conditions. There is also a risk of contamination entering the bearing during operation and servicing, e. g. when bearings are replaced. This in turn leads to increased wear and edge stresses in the rolling contact caused by foreign particles and results in premature material fatigue and a significant reduction in the operating life.

The Proven Aspects Remain: X-Life Quality And Optional Seals

The new bearings featuring rollers with end profiling retain all of their predecessors’ X-life characteristics. These include the optimised internal construction with increased load carrying capacity, the improved surface quality, and the floating central rib that effectively reduces friction. The option of equipping the bearings with seals that do not affect the design envelope also remains unchanged.

 

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