Designs and variants

Bearings with an inner ring centred cage

SKF high-capacity cylindrical roller bearings with an inner ring centred cage (fig. 1) are identified by the series designation NCF .. ECJB. 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.

When the outer raceway is integrated into the application, these bearings can be supplied without an outer ring (RN .. ECJB series, fig. 2).

Bearings with an outer ring centred cage

SKF high-capacity cylindrical roller bearings with an outer ring centred cage (fig. 3) are identified by the series designation NJF .. ECJA. For some sizes, the bearings contain more rollers than same-sized bearings with an inner ring centred cage. 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. For additional information, contact the SKF application engineering service.

When the inner raceway is integrated into the application, these bearings can be supplied without an inner ring (RNU .. ECJA series, fig. 4).

Separable bearings with an inner ring centred cage

SKF separable high-capacity cylindrical roller bearings with an inner ring centred cage (fig. 5) are identified by the series designation NUH .. ECMH. The bearing outer ring with the roller and cage assembly can be separated from the inner ring. This simplifies mounting and dismounting, particularly when load conditions require both rings to have an interference fit. These bearings can accommodate axial displacement of the shaft relative to the housing in both directions.

Double row bearings

Double row SKF high-capacity cylindrical roller bearings with cages can be supplied on request. They are based on the design of double row full complement cylindrical roller bearings (e.g. NNCF design). For additional information, contact the SKF application engineering service.

Cages

Depending on their design, series and size, SKF high-capacity cylindrical roller bearings are fitted with one of the cages shown in table 1.
For additional information about the suitability of cages, refer to Cages and Cage materials.

Matched bearings

SKF can supply matched bearings. To match bearings, SKF combines bearings so that the difference in cross-section height lies within a very small tolerance range. This reduced tolerance range is a precondition for equal load sharing between the bearings.
Matched bearings are identified by a designation suffix:
  • DR for a set of two bearings
  • TR for a set of three bearings
  • QR for a set of four bearings
For additional information, contact the SKF application engineering service.
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