Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
1996-05-13
2001-07-24
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S531000, C152S533000
Reexamination Certificate
active
06263935
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a tire; more particularly to a pneumatic tire capable of being used in the uninflated condition.
Various tire constructions have been suggested for pneumatic run-flat tires, that is, tires capable of being used in the uninflated condition. One approach taken has been to simply strengthen the sidewalls by increasing the cross-sectional thickness thereof. Due to the large amounts of rubber required to stiffen the sidewall members, heat build-up is a major factor in tire failure. This is especially true when the tire is operated for prolonged periods at high speeds in the uninflated condition.
An equally important design consideration in the development of a run-flat tire is insuring that the uninflated tire remains seated on the rim. Solutions have been developed employing bead restraining devices as well as special rims to accomplish this requirement.
Applicants have discovered a new invention which permits a tire construction to be built which can be operated in the uninflated condition for extended distances at relatively high speeds after which the tire can be repaired and returned to normal use, while at the same time maintaining the desired performance of the tire in the inflated state.
SUMMARY OF THE INVENTION
A radial ply pneumatic tire is described. The tire has an axis of rotation, a tread having a pair of lateral edges, a pair of reinforcing belts located radially inward of the tread, a pair of sidewalls extending radially inwardly from each lateral edge, a maximum section width defined as the maximum axial distance as measured from the outer surfaces of the sidewalls, and a tire carcass structure.
The tire carcass structure comprises a pair of bead portions, a carcass reinforcing structure and two bead fillers. The bead portion extends radially inwardly from each sidewall. Each bead portion includes a substantially inextensible bead core having a flat base surface. The flat base surface has a pair of edges and a width “W” between the edges. The bead core further has an axially inner first surface and an axially outer second surface extending radially outwardly from an edge of the flat base surface. Each first and second surface is tangent to the bead core. The first surface and the flat base surface form an acute included angle &agr;. The second surface and the flat base surface form an acute included angle &bgr;. The angle a is greater than or equal to the angle &bgr;.
The carcass reinforcing structure is radially inward of the reinforcing belts and extends circumferentially about the tire from one bead portion to the other bead portion, the carcass reinforcing structure has a first ply and a second ply. Each ply has a pair of turnup ends, one turnup end of each ply is wrapped about each bead core and extends axially and radially outwardly. The turnup end of the first ply terminates in proximity to the radial location of the maximum section width of the tire.
Each bead filler is adjacent to and extends radially outward from a bead core.
One embodiment of the invention includes an aramid overlay disposed radially outward of the belt reinforcing structure.
Another embodiment of the invention includes a pair of first fillers located between an innerliner and the first ply. One first filler extends from each bead portion radially to beneath the reinforcing belt.
Another embodiment includes, in addition to the first filler described above, a second filler. The second filler is disposed between the first and the second ply. The second filler extends from each bead portion radially outward to beneath the reinforcing belt.
Another embodiment includes a cord reinforcement member located between the bead filler and the second ply turnup. The cord reinforcement member has a first and second end. The first end is axially and radially inward of the second end. The cord reinforcing member increases in radial distance from the axis of rotation of the tire as a function of distance from its first end.
Another embodiment includes a pair of fabric reinforcing members, one member integral of each of the bead portions. The fabric reinforcing member has a first and second end, the reinforcing member is wrapped about the first end second plies and the bead core. Both the first and second ends extend radially above the bead core.
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The Plain DealerAug. 6, 1992, “Tire Makers Unveil New ‘Run-flat’ Models,” p. G-1.
Brayer Randall Raymond
Kahrs Jeffrey Wayne
McQuate Raymond Dean
Oare Thomas Reed
Robinson Beale Anthony
Johnstone Adrienne C.
King David L
The Goodyear Tire & Rubber Company
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