The bearings of type C are flangeless on two sides of the inner ring, two cages, and movable flange between two rows of spherical rollers. When the bearing is rotating, the middle flange can move in the axial direction. When the bearing is carrying an axial load, the load on the two rows can be adjusted. It makes the load distribution equal in order to avoid stress concentrated and single row roller loaded.
The bearings of type CA have flanges on two sides of the inner ring, one cage, and movable spacer in the middle of two rows of the spherical rollers. When the bearing is rotating, the middle spacer can move in the axial direction. When the bearing is carrying axial load, the load on the two rows can be adjusted. The load is distributed equally to avoid stress concentration. If there is no movable flange, the cage will have this function.
Spherical Roller Bearings with Fixed Flange
Spherical roller bearings with fixed flange have flanges on the both sides of inner ring. In the middle, there is a fixed middle flange at the two sides of inner ring, and two cages. The rollers are spherical type which is the same with type C, CA, but the roller length in axial direction is not symmetrical. When the bearing rotates, the middle flange ring can not move in the axial direction, but, can allow the rollers work properly. When the bearing is carrying axial direction load, it can not adjust the load on the two rows of rollers, because this will make the single row of rollers loaded or stress concentrated. Although this kind of bearing tends to be used by type C and CA, but, in some working condition, it still has advantages like occasions where axial load is not big, and vibration load is relative heavier.