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Rolling bearing unit for supporting vehicle wheel

  • US 6,524,011 B2
  • Filed: 07/27/2001
  • Issued: 02/25/2003
  • Est. Priority Date: 01/17/1997
  • Status: Expired due to Term
First Claim
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1. A bearing unit for vehicle wheel support comprising a shaft having a mounting flange, a step portion formed on one end portion thereof, and a substantially cylindrical portion formed on the end side of the step portion and crimped,a first inner ring formed with a first inner ring raceway thereon, and a second inner ring formed with a second inner ring raceway thereon, the first and second inner rings fitted onto the step portion of the shaft, wherein the shaft being made of a carbon steel containing carbon in the range of from 0.20 weight % to 0.6 weight %, and at least the cylindrical portion being kept as forged and without annealed.

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