Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1997-11-17
1999-11-23
Johnstone, Adrienne C.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152549, 152550, 152555, 152564, B60C 1700
Patent
active
059882476
ABSTRACT:
A pneumatic tire, more particularly a run flat tire, comprises at least three radial carcass plies each extending between bead portions through a tread portion and sidewall portions, the tread portion is provided between the radially outermost carcass ply and radially inner next carcass ply with a crown reinforcing rubber layer so that at least two carcass plies are disposed radially inside the crown reinforcing rubber layer, and each of the sidewall portions is provided between the axially innermost carcass ply and axially outer next carcass ply with a side reinforcing rubber layer so that at least two carcass plies are disposed axially outside the side reinforcing rubber layer. The reinforcing rubber layers are preferably made of a low heat generation rubber having a complex elastic modulus of 8 to 15 Mpa, and a loss tangent of 0.03 to 0.08. The complex elastic modulus of the side reinforcing rubber layer is preferably less than that of the crown reinforcing rubber layer.
REFERENCES:
patent: 5427166 (1995-06-01), Willard, Jr.
patent: 5685927 (1997-11-01), Hammond et al.
Johnstone Adrienne C.
Sumitomo Rubber Industries Ltd.
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