Underlay structure for increased crown stiffening
The present invention relates to a pneumatic radial ply tire and to the problem of crown lift-off (upward buckling of the tread) when a tire is inflated, underinflated or in the case of runflat tires, uninflated. More specifically, the present invention relates to tread underlays that serve to stiff...
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| Main Authors | , , |
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| Format | Patent |
| Language | English |
| Published |
21.09.2004
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| Online Access | Get full text |
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| Summary: | The present invention relates to a pneumatic radial ply tire and to the problem of crown lift-off (upward buckling of the tread) when a tire is inflated, underinflated or in the case of runflat tires, uninflated. More specifically, the present invention relates to tread underlays that serve to stiffen the tread and improve handling behavior, in both non-runflat tires, as well as runflat tires during inflated, underinflated or uninflated operation.
The present invention is a crown-stiffening underlay structure comprised of a flat strip of elastomeric material reinforced with essentially inextensible cords. The cord-reinforced flat strip is wrapped helically around the green tire carcass prior to blowup into the characteristic toroidal shape of a tire carcass. In one embodiment, the underlay structure is disposed between breakers and the radial ply structure. In another embodiment, the underlay is disposed between the radial ply structure and the innerliner. In another embodiment, the afore described underlay structure has an additional and structurally contiguous beam made of elastomeric material. |
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