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Wheel Bearing Apparatus For A Vehicle

  • US 20110206307A1
  • Filed: 05/04/2011
  • Published: 08/25/2011
  • Est. Priority Date: 11/05/2008
  • Status: Active Grant
First Claim
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1. A vehicle wheel bearing apparatus comprising:

  • an outer member formed with double row outer raceway surfaces on its inner circumference;

    an inner member including a wheel hub and at least one inner ring, the wheel hub is integrally formed with a wheel mounting flange on its one end, the wheel hub outer circumference has an axially extending cylindrical portion, the inner ring is press-fit onto the cylindrical portion of the wheel hub, via a predetermined interference, the inner ring outer circumference includes an inner raceway surface that opposes the inner side outer raceway surface of the outer member;

    double row balls are freely rollably contained between the outer raceway surfaces and inner raceway surfaces, respectively, of the outer member and the inner member;

    the inner ring is axially secured relative to the wheel hub by a caulked portion, the caulked portion is formed by plastically deforming the cylindrical portion radially outward; and

    the wheel hub is formed of medium-high carbon steel including carbon of 0.40-0.80% by weight and with a ferrite grain size number that is selected larger than #3.

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