Advances in turbofan engine design have brought on the need for counterrotating main shaft roller bearings to operate to speeds greater than 3.7 million DM. To begin assimilating a data base, four bearings were tested for 25 hours each - one with round rings, a soft trilobe, a hard trilobe and a hard bilobe. Internally, all bearings functioned equally well. However, severe fretting and ring turning developed at the inner ring shaft interface with all out-of-round bearings. Differential sumps pose some unique problems, but no problem could be linked to counterrotation. Computer Program CYLFLEX was enhanced with lubrication and friction calculations to treat counterrotating roller bearings. Load distribution, change in clearance, component kinematics, cage slip and frictional heat rate were all addressed.
Counterrotating differential cylindrical roller bearing development
Entwicklung gegendrehender Differential-Zylinderrollenlager
AIAA-Papers ; Jul ; 1-8
1987
8 Seiten, 18 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
High Speed Cylindrical Roller Bearing Development
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