Caged assemblies are simply a roller complement with a retainer, placed between two hardened machine elements that act as raceways. Their speed capability is about three times higher than that of loose-needle bearings, but the smaller complement of needles reduces load capacity for the caged assemblies.
What all that means Im still not sure.....
Summore;
The cage supports no bearing load; it serves to keep the balls located.
CAGED BEARING CONSTRUCTION
steel cage which provides inward retention of the needle rollers. The design provides maximum cage strength consistent with the long life requirements.