Tapered roller bearing and automotive pinion shaft supporting apparatus utilizing same tapered roller bearing

摘要

A tapered roller bearing according to the invention is such that when an arithmetical mean roughness as a surface roughness of a large end face of a tapered roller is Ã1 and an arithmetical mean roughness as a surface roughness of a large rib surface of an inner ring is Ã2, Ã1 is 0.04µm or larger, and
a composite roughness that is expressed by a square root of a sum of a squared value of Ã1 and a squared value of Ã2 is 0.17µm or smaller. Raceway surfaces of an outer ring and the inner ring and a rolling contact surface of the tapered roller are crowned, and a total crowning amount is set to 50µm or larger, an outer ring crowning rate is set to 40% or larger, and a roller crowning rate is set to 20% or smaller.