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Rolling bearing unit with encoder for supporting wheel

  • US 9,091,303 B2
  • Filed: 05/16/2014
  • Issued: 07/28/2015
  • Est. Priority Date: 07/22/2010
  • Status: Active Grant
First Claim
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1. A rolling bearing unit with an encoder for supporting a wheel, comprising;

  • an outer ring having double-row outer ring raceways around the inner circumferential surface thereof, and that is supported by and fastened to a suspension during use so as not to rotate;

    a hub having double-row inner ring raceways around the outer circumferential surface thereof, and with the wheel supported by and fastened thereto during use, rotates together with the wheel;

    rolling elements that are provided such that there are a plurality of rolling elements located in each row between the outer ring raceways and the inner ring raceways;

    the encoder that is supported by and fastened to the hub so as to be concentric with the hub, with the inside surface in the axial direction thereof being a detected surface having a magnetic characteristic that alternately changes in the circumferential direction; and

    a cover that is made of a non-magnetic plate material, and that comprises a cylinder section that extends in the axial direction, and a flat plate section that is bent and extends inward in the radial direction from the inside end section in the axial direction of the cylinder section, and together with this cylinder section fitting into the inside end section in the axial direction of the outer ring, the flat plate section closely facing the detected surface of the encoder;

    wherein a non-contact section is formed all the way around the inside end section in the axial direction of the cylinder section of the cover so as not to come in contact with the inner circumferential surface of the outer ring when the cover is fitted inside and fastened to the outer ring, and with the cover fitted into the inside end section in the axial direction of the outer ring, the cylinder section is fitted into the inside end section in the axial direction of the outer ring so that only the portion closer to the outside in the axial direction than the non-contact section fits inside with an interference fit,wherein the non-contact section is formed into a partial conical cylindrical shape that is inclined in a direction such that the diameter becomes smaller going inward in the axial direction, andwherein an inclination angle of a generating line of the non-contact section with respect to a center axis of the rolling bearing unit is 15 degrees to 25 degrees.

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