Vehicle pinion shaft support system

Details Vehicle pinion shaft support system Vehicle pinion shaft support system

2005-12-21

2008-10-14

Charles, Marcus (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

C384S450000

Reexamination Certificate

active

07435008

ABSTRACT:
There are provided tapered roller bearings which support a pinion shaft. Inner races have large rib faces each having a recessed surface shape on which large-diameter end faces of tapered rollers slide. The surface roughness of the large-diameter end face is σ1[μmRa] is 0.025 or more. In addition, assuming the surface roughness of the large rib face is σ2[μmRa], (σ12+σ22)1/2is 0.17 [μmRa] or less. The sliding portion of the large-diameter end face and the sliding portion of the large rib face are made of a carburized steel, and the carbon content in a matrix phase in a surface layer portion of each of the sliding portions to a depth of 50 μm from a surface is 0.8 wt % or more, the surface hardness thereof is in the range of Rockwell C63 to 67, and a surface retained austenite amount is set to be 20% or more and 25% or less.

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