METHOD OF MANUFACTURING A BRINELLING-RESISTANT HUB BEARING UNIT
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United States of America Patent
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Issued Date -
Apr 6, 2023
app pub date -
Oct 6, 2021
filing date -
Oct 6, 2021
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Abstract
A method of manufacturing a wheel hub bearing unit includes providing a bearing ring having at least one raceway surface, the bearing ring preferably being a bearing outer ring which is preferably formed of a steel having a carbon content of between about 0.55% by weight and 0.60% by weight. The bearing ring is carbonitrided within a furnace having an enclosed atmosphere containing ammonia gas. The bearing ring is then tempered by heating the ring to at least five hundred degrees Celsius (500° F.). Next, the induction hardening the at least one raceway surface of the ring is induction hardened, preferably by means of special inductor coil. Finally, the raceway surface(s) of the ring is machined to desired final dimensions and surface finish.
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