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Rotation-speed sensor device

  • US 20030093188A1
  • Filed: 10/18/2002
  • Published: 05/15/2003
  • Est. Priority Date: 10/18/2001
  • Status: Active Grant
First Claim
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1. A rotation-speed sensor device comprising:

  • an encoder supported by a rotating race to be concentric with the rotating race and having a detected portion the characteristics of which are alternately changed in a circumferential direction, the rotating race composing a rolling bearing unit for wheel support to rotate together with a wheel when moving, a first rotation detection sensor supported by a non-rotating member and having a detecting portion facing the detected portion to produce a detection signal, a wireless transmission device for sending the detection signal from the first rotation detection sensor to a controller provided on the vehicle chassis side, and a self-diagnosis circuit to judge whether there is a problem or not in detecting rotation-speed.

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