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Wheel bearing apparatus incorporated with a rotational speed detecting apparatus

  • US 8,393,795 B2
  • Filed: 03/16/2012
  • Issued: 03/12/2013
  • Est. Priority Date: 09/17/2009
  • Status: Active Grant
First Claim
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1. A wheel bearing apparatus incorporating a rotational speed detecting 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 at one end with a wheel mounting flange, 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 inner raceway surfaces oppose the double row outer raceway surfaces;

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

    a magnetic encoder is adapted to be fit onto the outer circumference of the inner ring and secured to the inner ring, the magnetic encoder has a magnetic characteristics alternately and equidistantly varying in a circumferential direction;

    a seal is mounted on an outer-side end of the outer member, a protecting cover is mounted on an inner-side of the outer member, the seal and protecting cover close and seal annular openings formed between the outer member and the inner member;

    the protecting cover is formed of non-magnetic steel sheet to have a cup-shaped configuration by press working, the protective cover includes a cylindrical fitting portion press-fit into an end, inner circumference of the outer member, a donut-shaped shielding portion extends radially inward from the fitting portion via a radially reducing portion, an inner-side surface of the shielding portion is arranged near to or in contact with a rotational speed detecting sensor, a bottom portion is continuous with the shielding portion via a stepped portion to close the inner-side end of the inner member;

    a sealing member is integrally adhered to the outer circumference of the radially reducing portion by vulcanizing adhesion, the sealing member includes an annular portion and a projected portion, the annular portion of the sealing member is positioned axially inside of the projected portion, the annular portion is formed with a diameter slightly smaller than the outer diameter of the fitting portion of the protecting cover, the projected portion is formed with a diameter slightly larger than the outer diameter of the fitting portion of the protecting cover; and

    the projected portion is press-fit into the end inner circumference of the outer member via a predetermined interference.

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