According to the different cage and with or without ribs, sperical roller bearings can be classified into two types:

-CA design

-C design

There are two ribs in the two ends of the inner ring of CA design sherical roller bearings, but no rib in the middle. The cage of
CA design, which is usually made of copper or carbon copper, is a solid cage with vulsellum structure. The large-scale series and outsize series of CA design are used widely. C design ones
have no ribs.Their rollers are self-initializing, guide ring is in the middle. Their cage are pressed steel cage. These bearings have longer rollers and heavier rated load, higher
limit speed and low rifriction.