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Run-flat tire with an improved bead to rim interface

  • US 5,868,190 A
  • Filed: 06/10/1997
  • Issued: 02/09/1999
  • Est. Priority Date: 06/10/1997
  • Status: Expired due to Term
First Claim
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1. A radial run-flat tire comprising:

  • a pair of sidewall portions;

    a plurality of crescent shaped sidewall members in each sidewall portion for supporting said tire with a loss of inflation pressure;

    a pair of spaced apart annular beads;

    a pair of radially reinforced carcass layers extending from bead to bead and disposed about said crescent shaped sidewall members;

    a middle carcass layer extending from bead to bead between crescent shaped members and having both ends partially encircling a respective bead core and turned-up around said bead core to lap with an outermost one of said pair of carcass layers; and

    first and second bead fillers each disposed radially outward of each bead core and axially between carcass layers, said first bead filler extending radially outward from said bead core to form one sidewall member of said plurality of crescent shaped sidewall members and said second bead filler bounded by said first bead filler and said bead core for providing a filler material adjacent the bead core with a lower hardness than that of the first bead filler.

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