EQTF Ball Bearing


EQTF (Extra Quality Tough Ball Bearings For Transmissions) are bearings developed with balls made of special steel characterized by better wear protection through case hardening (carbonitriding) the surface and by adding hard silicon nitride particles within the steel. But the secret of their success does not lie in just applying the technology to existing applications. 
For high-speed rotation of HEV and EV powertrains, when the lubrication environment degrades, flaking may occur at the surface due to a deterioration of the surface texture, which is caused by insufficient oil film between the race surface and balls.
Following a comprehensive study of the mechanism that results in surface-originated flaking, NSK developed EQTF, which extends bearing life by strengthening the rolling elements.

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