Page 9 of catalogue Bearings for paper production of Schaeffler Technologies GmbH & Co. KG

ASSR bearings Varying load phases occur in the CDprofile control rolls of calenders in paper Machines. During production, the gap between the rolls is closed, which means a certain pressure is created between the two rolls. Both the nip load and the weight of the roll shell are supported by hydrostatic control elements. This means that only very low loads act on the rolling bearings and there is a risk of slippage, which can lead to premature bearing failure. The solution: ASSR bearings In cooperation with a customer, the Schaeffler Group developed an innovative bearing concept for preventing slippage – the ASSR bearing (Anti Slippage Spherical Rolling Bearing). Our customers benefit from a long bearing life and reduced maintenance expenditures. While standard bearings reach an operating life of about one year because of smearing marks on the raceway surfaces caused by slippage, the expected operating life of the ASSR bearing, having eliminated slippage damage, is at least ten years. This means longer rolling bearing operating life, lower maintenance requirements and therefore higher potential for saving costs. This “spherical rolling bearing” consists primarily of the rings of a standard spherical roller bearing. In each of the two rows of rolling elements, barrel rollers alternate with balls. In the low-load phase, the balls ensure slippage-free operation. The barrel rollers support the loads in the high-load phase.

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