Multirow bearings – (Multi Track) Multiroll


Four- and six-row cylindrical roller multirow (multiroll) bearings are mainly used in the necks of rolling cylindres, calenders and roll presses. The reduced cross section allows the adoption of large diameter packages with respect to the rolling diameter. Thanks to the large number of rolling elements, the radial load carrying capacity is extremely high.
Multirow (multiroll) bearings have lower friction than other roller bearings and are particularly suitable for applications where high speeds are required.

Exactly in this context Distitec has designed, developed and patented a multirow bearing (multi track), with a particular cage that is mounted in our 4-row cylindrical roller bearings for the necks of cylinders in hot and cold rolling mills. This cage leads to a consequent improvement in the functionality of the bearing with improvements in load capacity, speed and consequently the same duration, while maintaining perfect interchangeability with its homologus available on the market.

In particular, the new Distitec version has the following features:

“The massive double-comb cages of our production are built with important changes compared to the execution currently available on the market. These modifications ensure an optimal functioning of the cage which is an essential and fundamental component for the good functioning of rolling bearings. A cage built quickly with brutal machining can cause the premature death of the rolling system and consequently of the bearing itself. “

The massive cages that we have studied and patented, as regards the manufacturing procedure, have the following changes compared to the executions currently in use:
– Multi-step manufacturing process to minimize internal cage tensions;
– External central edge rectified: this guarantees the cage to be guided correctly on the internal central edge of the external ring (also rectified). This allows the cage to minimize the power lost due to sliding friction by decreasing the operating temperature of the bearing.
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