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Wheel bearing unit

  • US 6,428,214 B2
  • Filed: 11/30/2000
  • Issued: 08/06/2002
  • Est. Priority Date: 01/11/2000
  • Status: Active Grant
First Claim
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1. A wheel bearing unit comprising:

  • an outer race member having two rows of raceway surfaces formed in its inner peripheral surface, the outer race member being attached to a body of a motor vehicle; and

    an inner race member provided with a wheel mounting flange, the inner race member being rotatably supported through two rows of balls by the outer race member, wherein the inner race member has a projection formed in vicinity of a groove bottom portion of its raceway surface, the projection having a diameter greater than an inscribed circle diameter, and wherein, in the inner race member, the raceway surface, an outer peripheral surface of the projection, and a smaller end face are concurrently ground to keep within a predetermined range of standard values a radius difference between a diameter of a groove bottom portion of the raceway surface of the inner race member and an outer diameter of the projection, as well as a core deviation between a groove bottom portion of the raceway surface and the smaller end face.

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