Tapered roller bearing and automotive pinion shaft...

Details Tapered roller bearing and automotive pinion shaft... Tapered roller bearing and automotive pinion shaft...

2011-01-25

2011-01-25

Hannon, Thomas R (Department: 3656)

Bearings

Rotary bearing

Antifriction bearing

C384S450000, C384S568000

Reexamination Certificate

active

07874737

ABSTRACT:
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 σ1 and an arithmetical mean roughness as a surface roughness of a large rib surface of an inner ring is σ2, σ1 is 0.04 μm or larger, anda composite roughness that is expressed by a square root of a sum of a squared value of σ1 and a squared value of σ2 is 0.17 μm 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 50 μm or larger, an outer ring crowning rate is set to 40% or larger, and a roller crowning rate is set to 20% or smaller.

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Japanese Office Action dated Dec. 8, 2009 (and English translation thereof).

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