Tapered roller bearing design

In the early market, in order to meet the design requirements for single bearing, usually bearing the three cylindrical roller bearings. The design is similar slewing bearing, a rolling body (similar to the cylindrical roller bearings) to bear all of the radial force, the other two rolling elements (similar to roller thrust Roller bearing  bear a bidirectional axial force. The bearing of the bearing arrangement appears to meet some of the features alone, but by running the analysis bearing thrust bearing function as two rows of rolling bodies to make the whole circle of the bearing is rotated, the both end surfaces of the rolling elements can not achieve the same speed, which it means that the bearings during the large number of sliding friction. And as rolling bearings, sliding friction is to try to avoid, because it will not only bring more bearing heating, while the lubrication of sliding friction in the bearing lubrication is also a very difficult question. Because of the design on some of the issues, the bearing is now unable to meet the growing power of the wind turbines to the demand.
Comparison of different designs cage
In addition to SKF Nautilus bearing cage design, the market there are several different cage designs. Respectively, are to compare the advantages and disadvantages of several cage.