Run-flat tire

Details Run-flat tire Run-flat tire

2011-02-15

2011-02-15

Johnstone, Adrienne C (Department: 1791)

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

C152S451000, C152S543000, C152S555000, C152S556000, C428S394000

Reexamination Certificate

active

07886790

ABSTRACT:
This invention relates to a tire having an improved durability in the run-flat running without damaging the ride comfort in the usual running, and more particularly to a run-flat tire comprising a sidewall portion provided with a side reinforcing rubber layer having a crescent shape at section wherein a cord layer including a polyketone fiber cord satisfying the following conditions of the following equations (I) and (II):in-line-formulae description="In-line Formulae" end="lead"?σ≧−0.01×E+1.2  (I)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?σ≧0.02  (II)in-line-formulae description="In-line Formulae" end="tail"?[wherein σ is a thermal shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49 N (cN/dtex)] is disposed in at least a part of a region A ranging from a belt end to a maximum width part of a tire side portion and a region B ranging from a neighborhood of a bead core to a bead filler.

REFERENCES:
patent: 2008/0099118 (2008-05-01), Akahane et al.
patent: 2000-198307 (2000-07-01), None
patent: 2000-264012 (2000-09-01), None
patent: 2001295134 (2001-10-01), None
patent: 2004-218189 (2004-08-01), None
patent: 2004-306658 (2004-11-01), None
English machine translation of JP 2004-218189 A, Aug. 5, 2004.

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