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Hub and bearing assembly with integrated rotation sensor including a tone ring and annular transducer

  • US 5,200,697 A
  • Filed: 11/27/1991
  • Issued: 04/06/1993
  • Est. Priority Date: 11/27/1991
  • Status: Expired due to Term
First Claim
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1. A bearing assembly comprising:

  • an inner bearing race located radially within an outer bearing race having an axis of rotation,a plurality of rolling bearing elements located radially between said inner and outer bearing races permitting relative rotation between said races,a tone ring defining a face having regions of magnetic poles which alternate in polarity along said face, said tone ring being fixed relative to one of said bearing races,an annular transducer fixed to the other of said bearing races, said transducer having a case made of a ferromagnetic material defining a first set of teeth facing said tone ring face, and a second set of teeth facing said tone ring face, said transducer teeth being arranged relative to said tone ring magnetic pole regions such that said first set of teeth are magnetically coupled to regions of said tone ring defining one magnetic pole while said second set of teeth are magnetically coupled to regions of said tone ring defining the opposite magnetic pole, and said transducer teeth coupled to said tone ring such that said poles exposed to said first and second set of teeth alternate upon relative rotation between said tone ring and said transducer, anda conductor winding within said transducer whereby an alternating magnetic flux passing through said transducer in response to said relative rotation induces an alternating voltage in said winding.

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