turbine engine bearings
ronnie barker,
Each shaft assy in a turbine engine uses some combination of ball and cylindrical roller bearings. One end of the shaft (usually the compressor/fan end) uses a ball bearing (usually a gothic arch or 4-point configuration) for radial and axial loads. The opposite end of the shaft uses a cylindrical roller for radial loads. This combination of ball and roller bearings provides the correct degree of constraints on the shaft system. The ball bearing controls axial location at the front, while the roller bearing at the rear allows for thermal expansion and contraction along the engine's length.
Tapered rollers are not used on turbine engine spools since they do not like operating at high DN values, due to the high friction losses created where the roller big end rubs against the race shoulders.
Sometimes the ball and roller bearings used in turbine engine spools employ oil film damping of the outer races to help mitigate some of the detrimental dynamic loading effects the bearing might experience.
Hope that helps.
riff raff