Wheel-support rolling bearing unit

Details Wheel-support rolling bearing unit Wheel-support rolling bearing unit

2006-02-28

2006-02-28

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

C384S625000, C384S913000, C029S898060

Reexamination Certificate

active

07004637

ABSTRACT:
In a wheel-support rolling bearing unit, in order to made a flange6thinner and thus lighten the bearing unit without impairing fatigue strength, machinability, and workability after forging, the composition of the alloy steel constituting the flange attached member (hub ring2), the surface hardness of the root portion14on the axial outside surface side of the flange6, and the surface roughness, are stipulated to thereby improve the durability ratio (fatigue limit strength/tensile strength) of the flange6. In one aspect, the member is made from an alloy steel containing C: 0.5 to 0.65 weight %, Mn: 0.3 to 1.5 weight %, Si: 0.1 to 1.0 weight %, Cr: 0.01 to 0.5 weight %, S: 0.35 weight % or less, and any one type or more selected from 0.01 to 0.2 weight % of V, 0.01 to 0.15 weight % of Nb, and 0.01 to 0.15 weight % of Ti, with the rest being Fe and inevitable impurities, and the oxygen contents is 15 ppm or less. Moreover, the surface hardness of the inner raceway7aformed with the hardened layer, is between Hv 650 and 780, and the surface hardness of a portion not formed with the hardened layer is between Hv 230 and 300.

REFERENCES:
patent: 6165289 (2000-12-01), Matsumoto et al.
patent: 6197128 (2001-03-01), Maeda
patent: 6524011 (2003-02-01), Miyazaki et al.
patent: 6715926 (2004-04-01), Tajima et al.
patent: 6719854 (2004-04-01), Komori et al.
patent: 6761486 (2004-07-01), Miyazaki et al.

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