Cylindrical roller bearings with increased load ratings for large gearboxes

Cylindrical roller bearings are often used in large gears because this type of bearing can withstand high mechanical loads. The systems and thus also the rolling bearings often run 24 hours a day and require a high level of reliability and a long service life. NSK has developed a new series of large cylindrical roller bearings with increased load ratings, which achieve a longer service life than corresponding standard bearings.

The development goal was achieved above all by an increased number of roles. This increases the contact area between the raceways and the rollers, so that the surface pressure between these two components is reduced. An increase in the number of rollers initially leads to less space for the cage remains. As a result, reduces the cross section of the cage webs. To further ensure sufficient cage strength, the cage design has been optimized. Due to the special geometry of the webs, all forces induced in the cage are absorbed evenly.

Bearings for everyone in over 60 industries

Compared with the large cylindrical roller bearings used up to now, the new series has a service life that is up to 30% longer - even under harsh environmental conditions and high mechanical loads, such as those that can occur in large gearboxes. The series is available with outside diameters up to 400 mm. The main areas of application for the manufacturer include transmissions for multi-megawatt wind turbines and large-scale systems such as the steel industry and process engineering.