Low-friction tapered roller bearing and manufacture method thereof

A method comprising:

• selecting a tapered roller bearing having a friction torque too high for a given application, the tapered roller bearing including an outer ring having a raceway surface, an inner ring having a raceway surface and a plurality of tapered rollers each having a rolling surface and a large end-face,
• optimizing a surface roughness of at least one surface of the tapered roller bearing selected from a group consisting of:
• the outer ring raceway surface, the inner ring raceway surface, the rolling surfaces of the tapered rollers and the large end faces of the tapered rollers,
• black oxidizing the at least one surface, and
• after the optimizing and the black oxidizing, using the tapered roller bearing in the given application.