NSK has developed a third generation ultra high speed ball bearing for electric vehicle (EV) motors capable of operating at over 1.8 million dmN (A measure of bearing rotational performance. The product of bearing pitch diameter (dm) in millimeters and rotational speed (N).).
The cage is made with a new high rigidity resin material that is more effective at suppressing deformation during high-speed rotation than conventional materials.
Topology optimization contributed to reducing weight to the utmost limit by removing parts that do not contribute to the strength and rigidity of the cage, and to deriving the optimal cage shape for high-speed rotation.
