Multi-row radial ball bearings
For the support of the axially oscillating doctor rolls of papermaking machine dryer sections, SKF produces multi-row radial ball bearings of special design (fig 1). These bearings have several rows of balls held and guided in a machined brass cage. The inner and outer ring raceways have a cylindrical form (fig 2) so that axial displacements of the shaft relative to the housing can be accommodated within the bearing in both directions. Thrust washers are required at both sides of the bearing to limit axial movement of the cage.
Eight standard sizes of varying designs are produced as standard, see table.