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Wheel Bearing Apparatus

  • US 20130195389A1
  • Filed: 03/14/2013
  • Published: 08/01/2013
  • Est. Priority Date: 09/22/2010
  • Status: Active Grant
First Claim
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1. A wheel bearing apparatus comprising:

  • an outer member integrally 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, a cylindrical portion axially extends from the wheel mounting flange, the inner ring is press-fit onto the cylindrical portion of the wheel hub, the wheel hub and the inner ring are formed with double row inner raceway surfaces on their outer circumferences, the double row inner raceway surfaces oppose the double row outer raceway surfaces;

    double row rolling elements are contained between the inner and outer raceway surfaces of the inner and outer members;

    a magnetic encoder is mounted on the outer circumference of the inner ring; and

    annular openings are formed by the inner and outer members, a seal is mounted on the outer-side end of the outer member and a protecting cover is mounted on the inner-side end of the outer member;

    the protecting cover is formed from non-magnetic material, the protecting cover has a substantially dish-shaped configuration and comprises a cylindrical fitting portion, a disc-shaped shielding portion and a bottom portion, the cylindrical fitting portion is adapted to be press-fit onto the inner circumference of the inner-side end of the outer member, the disc-shaped shielding portion extends radially inward from the fitting portion via a radially tapered portion, the disc-shaped shielding portion is adapted to be closely arranged or in contact with a sensor, the bottom portion extends from the shielding portion, via a stepped portion, the bottom portion covers the inner-side end of the inner member;

    a flat relief portion is formed between the radially tapered portion and the shielding portion, the flat relief portion is parallel to the shielding portion and set slightly back from the shielding portion toward the radially tapered portion; and

    an elastic member is integrally adhered to the outer circumference of the radially tapered portion via vulcanizing adhesion, the elastic member is adapted to elastically contact the inner circumference of the inner-side end of the outer member.

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