EA Spherical Roller Bearings - NSK - #1

NSK's spherical roller bearing line-up has included the standard CD type with pressed-steel cages and the high-capacity H type with plastic cages.

However, NSK recently introduced EA spherical roller bearings which have the advantages of both types and, moreover, incorporate performance improvements making them the next generation of spherical roller bearings.

This article presents NSK's new EA spherical roller bearings.

The newly conceptualized and designed interior of EA bearings (Photo 1) offers outstanding features which fulfill the exacting requirements of today's industry. (Patented in the U.S.A., the U.K. and Germany. Patent pending in Japan.)

Fig. 1 compares the interior designs of EA and CD spherical roller bearings.

In CD bearings, a guide ring controls roller movement. However, this function in EA bearings is assumed by the cage, thus allowing the omission of the guide ring. The optimum design of the cage and inner and outer rings provides space for larger and more rollers. As a result, the load capacity is increased 10 to 20% and the bearing life is extended 30 to 80%.

Fig. 2 compares the load capacities of EA and CD bearings.

Fig. 2 Dynamic load ratings of 222XX Series

Motion & Control No. 4 — 1998 NSK