Tire with anchored carcass
AssigneeSedepro
InventorsYves Herbelleauu, Jean-Jacques Pradelle
Life of this patent
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Abstract
The carcass cords extend into the bead where they are anchored with at least one pile of circumferentially oriented cords by a rubber mix having a Shore A hardness of more than 70 interposed between the carcass cords and the circumferentially oriented cords. The carcass may be formed from a single cord which passes forward and back from one bead to the other or by cut cords. In some embodiments, the carcass cords are divided in the bead into two circumferential alignments spaced axially apart.
Claims24
A tire comprising at least one carcass anchored in each side of the tire in a bead, the bead having a base which is intended to be mounted on the tire's design rim seat, each bead being extended radially upward by a sidewall, the sidewalls joining a tread, the carcass comprising at least one carcass cord which extends in forward paths from the sidewall down to the bead and in return paths from the bead up the sidewall, the forward and return paths being arranged adjacent each other in the bead and being aligned circumferentially in the bead, a loop connecting each forward path to a return path, the forward and return paths of each carcass cord forming at least one circumferential alignment in the bead, and carcass anchoring means laterally bordering the at least one circumferential alignment in the bead on at least one side in the axial direction, said carcass anchoring means including at least one pile of circumferentially oriented cords taking up the tension which is developed in the carcass upon inflation solely by the adherence of each carcass cord laterally with the anchoring means.
A tire comprising at least one carcass anchored in each side of the tire and extending radially towards the bottom in a bead, the bead having a base which is intended to be mounted on the tire's design rim seat, each bead being extended radially upward by a sidewall, the sidewalls joining a tread, the carcass comprising portions of carcass cord which are arranged adjacent each other to form in the upper part of the sidewall a circumferential alignment of portions of cord extending downward to the bead, the alignment of carcass cord portions as they extend from the top of the sidewall towards the bottom of the bead being divided into at least two axially spaced circumferential alignments, the at least two axially spaced alignments having their radially lowermost ends axially spaced apart, and carcass anchoring means laterally bordering and being adhered to the alignments, the means for anchoring the carcass including at least one pile of circumferentially oriented cords, and in which each of said alignments in the bead is bordered laterally by at least one pile of circumferentially oriented cords.
A tire comprising at least one carcass anchored in each side of the tire and extending radially towards the bottom in a bead, the bead having a base which is intended to be mounted on the tire's design rim seat, each bead being extended radially upward by a sidewall, the sidewalls joining a tread, the carcass comprising portions of carcass cord which are arranged adjacent each other to form in the upper part of the sidewall of circumferential alignment of portions of cord extending downward to the bead, the alignment of carcass cord portions as they extend from the top of the sidewall towards the bottom of the bead being divided into at least two axially spaced circumferential alignments, the at least two axially spaced alignments having their radially lowermost ends axially spaced apart, and the carcass anchoring means laterally bordering and being adhered to the alignments, the means for anchoring the carcass including at least one pile of circumferentially oriented cords, and including a layer of rubber mix having a Shore A hardness of more than 70 interposed between the at least one of the alignments and the circumferentially cords, and in which the layer of interposed rubber mix is a mix containing a styrene/butadiene rubber hereinafter referred to as an SBR synthetic elastomer the glass transition temperature T.sub.g of which is between -70.degree. C. and -30.degree. C., in a proportion of at least 40% of the total weight of elastomer.
A tire comprising at least one carcass anchored in each side of the tire and extending radially towards the bottom in a bead, the bead having a base which is intended to be mounted on the tire's design rim seat, each bead being extended radially upward by a sidewall, the sidewalls joining a tread, the carcass comprising portions of carcass cord which are arranged adjacent each other to form in the upper part of the sidewall a circumferential alignment of portions of cord extending downward to the bead, the alignment of carcass cord portions as they extend from the top of the sidewall towards the bottom of the bead being divided into at least two axially spaced circumferential alignments, the at least two axially spaced alignments having their radially lowermost ends axially spaced apart, carcass anchoring means laterally bordering and being adhered to the alignments, and a layer of rubber mix having a Shore A hardness of more than 70 interposed between the at least one of the alignments and the circumferentially oriented cords, the means for anchoring the carcass including at least one pile of circumferentially oriented cords, and in which the layer of interposed rubber mix is a mix containing styrene/butadiene rubber hereinafter referred to as an SBR synthetic elastomer wherein the SBR synthetic elastomer is blended with polybutadiene, the glass transition temperature Tg of which is between -40.degree. C. and -10.degree. C., the total proportion of SBR synthetic elastomer and polybutadiene being at least 40% of the total weight of elastomer.
A tire comprising at least one carcass anchored in each side of the tire and extending towards the bottom in a bead, the bead having a base which is intended to be mounted on the tire's design rim seat, each bead being extended radially upwardly by a sidewall, the sidewalls joining a tread, the carcass comprising portions of carcass cord which are arranged adjacent each other and form in the upper part of the sidewall a single circumferential alignment of portions of cord extending downward to the bead, the carcass as it extends radially from the top of the sidewall towards the bottom of the bead being divided into at least two axially spaced circumferential alignments, the carcass being made from a continuous carcass cord, all said portions of cord of each of the alignments of the bead being connected, two by two in each alignment, by a loop located at the radial level nearest the base of the bead, the bead comprising carcass anchoring means, including at least one pile of circumferentially oriented cords, laterally bordering and adhered to at least one of the axially spaced circumferential alignments, and in which the said loops are arranged radially at a level lower than the lowermost part of the adjacent pile or piles of circumferentially oriented cords.
Dependencies are inferred from the claim text.