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Bearing with absolute angle sensor

  • US 8,212,551 B2
  • Filed: 08/03/2004
  • Issued: 07/03/2012
  • Est. Priority Date: 08/03/2004
  • Status: Active Grant
First Claim
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1. An absolute angle sensor equipped bearing assembly comprising:

  • a sensor equipped bearingincluding a bearing unit having a stationary raceway ring and a rotating raceway ring rotatable relative to the stationary ring through rolling elements, and a rotation detector capable of providing, as a detection output indicative of a rotation angle of a rotating raceway ring relative to the stationary raceway ring, two analog outputs that are offset 90°

    in phase relative to each other in terms of electrical degree; and

    a correction data storing device, which stores a correction data to correct an error when an absolute angle of the rotation angle of the rotating raceway ring is calculated based on the two analog outputs, and which is used paired with the sensor equipped bearing,wherein the rotation detector includes a to-be-detected element made up of an annular backing metal and a magnetic generating member, mounted on the backing metal, in the form of an annular component having an outer peripheral portion magnetized in which one complete rotation thereof corresponds to one cycle of a sinusoidal magnetization distribution, and a magnetic sensor accommodated in an annular casing and confronting the to-be-detected element, the rotation detector being secured to the bearing unit in a manner such that a relative positional relation between the bearing unit and the rotation detector does not change after the sensor equipped bearing assembly has been incorporated in an equipment, andwherein the to-be-detected element of the rotation detector is fitted on an outer peripheral surface of the rotating raceway ring of the bearing unit through the backing metal, and the magnetic sensor is fitted on an inner peripheral surface of the stationary raceway ring of the bearing unit through the annular casing, one of the opposite end portions of the annular backing metal and one of the opposite end portions of the annular casing, both remote from the bearing unit, being bent radially inwardly to same radial positions.

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