Designs and variants
The basic SKF assortment of single row full complement cylindrical roller bearings provided here includes NCF and NJG design bearings. They are used to locate the shaft axially in one direction and eventually to accommodate axial displacement of the shaft relative to the housing in the opposite direction.
NCF design bearings
- have two integral flanges on the inner ring and one on the outer ring (fig. 1)
have a retaining ring in the outer ring, on the side opposite the integral flange, to hold the bearing together
The retaining ring should not be loaded axially during operation.
NJG design bearings
- comprise the heavy 23 dimension series
- are intended for very heavily loaded, low-speed applications
- have two integral flanges on the outer ring and one on the inner ring (fig. 2)
have a self-retaining roller complement
Therefore, the outer ring with the roller complement can be separated from the inner ring without having to take special precautions to prevent the rollers from falling out (fig. 3). This simplifies mounting and dismounting.
are combined so that any difference in cross-sectional height of the bearings used in a matched set lies within a very small tolerance range
This tighter tolerance is a precondition for equal load sharing between the bearings.
can be supplied as:
- sets of two bearings (designation suffix DR)
- sets of three bearings (designation suffix TR)
- sets of four bearings (designation suffix QR)