| 摘要 |
An amount of undulation by which the inner surface 11 of a large-diameter-side flange portion 8 formed in an inner ring 5 is undulated is defined as an axial deflection 8. And, the composite roughness of a contact portion between the inner surface 11 and the head portion 10 of a tapered roller 6 is expressed as sigma. A tapered roller bearing 1 is structured in such a manner that delta<=8 mum and sigma<=0.22 mumRMS, or, delta<=12 mum and sigma<=0.18 mu, or, delta<=16 mum and sigma<=0.13 mumRMS can be satisfied.
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