BEARING UNIT RACEWAY RING MEMBER, BEARING UNIT, AND METHOD AND APPARATUS FOR MANUFACTURING BEARING UNIT RACEWAY RING MEMBER
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United States of America Patent
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Issued Date -
Oct 22, 2009
app pub date -
Aug 7, 2007
filing date -
Aug 7, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
There is provided a bearing unit including one raceway ring 2 which is mounted on a vehicle body, the other raceway ring 4 which is disposed to face the one raceway ring 2 and is mounted on a wheel, and a plurality of rolling elements 6, 8 which are built in rollably between an outer ring raceway 2s and an inner ring raceway 4s which are formed continuously on facing surfaces of both the raceway rings 2, 4, respectively, along a circumferential direction, at least either of the raceway rings 2, 4 having a connecting flange 12a or a mounting flange 12a at which the raceway ring is mounted on the vehicle body or the wheel, wherein both the raceway rings 2, 4 are formed entirely through cold forging with no machining given to a surface of the flange 2a, 12a, while a quenching and tempering treatment by electromagnetic induction and grinding are given to at least the outer ring raceway 2s and the outer ring raceway 4s.
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