Tire for vehicle comprising a stiffening structure
A tire ( 1 ) has improved handling and comprises a stiffening structure ( 7 ) comprising two stiffening elements ( 8 ), each extending continuously in the toroidal interior cavity ( 6 ) from a crown interface ( 81 ) connected to a radially inner face of the crown ( 23 ) to a bead interface ( 82 ) connected to an axially inner face of the bead ( 41 ). The stiffening structure ( 7 ) is distributed circumferentially around the entire circumference of the tire. The crown interface ( 81 ) is positioned, with respect to the equatorial plane (XZ), at an axial distance A at most equal to 0.45 times the axial width S and the bead interface ( 82 ) is positioned, with respect to a radially innermost point (I) of the axially inner face of the bead ( 41 ), at a radial distance B at least equal to 0.10 times the radial height H and at most equal to 0.5 times the radial height H.
1 . A vehicle tire, intended to be mounted on a nominal rim and inflated to a nominal pressure P, the vehicle tire having an axial width S and a radial height H in the mounted and inflated state, and comprising a crown having a radially outer tread surface, intended to come into contact with ground, and two axial ends, each extended radially inwards by a sidewall of the vehicle tire and then by a bead of the vehicle tire, intended to come into contact with the nominal rim,
wherein the crown, the sidewalls, and the beads delimit a toroidal interior cavity,
wherein the vehicle tire has an equatorial plane passing through a middle of the radially outer tread surface and perpendicular to an axis of rotation of the vehicle tire,
wherein the vehicle tire further comprises a stiffening structure, distributed circumferentially around an entire circumference of the vehicle tire and comprising two stiffening elements, each extending continuously in the toroidal interior cavity from a crown interface connected to a radially inner face of the crown to a bead interface connected to an axially inner face of the bead,
wherein each stiffening element comprises filamentary reinforcing elements that are partially uncoated with an elastomer compound to make the stiffening element unsealed, except at portions of the stiffening element, which form the crown interface and the bead interface, respectively, and in which the filamentary reinforcing elements are coated with the elastomer compound,
wherein the crown interface of each stiffening element is positioned, with respect to the equatorial plane, at an axial distance A at most equal to 0.45 times the axial width S, and
wherein the bead interface of each stiffening element is positioned, with respect to a radially innermost point I of the axially inner face of the bead, at a radial distance B at least equal to 0.10 times the radial height H and at most equal to 0.5 times the radial height H.
2 . The vehicle tire according to claim 1 , wherein the two stiffening elements are positioned symmetrically on either side of the equatorial plane.
3 . The vehicle tire according to claim 1 , wherein the axial distance A is at least equal to 0.05 times and at most equal to 0.15 times the axial width S.
4 . The vehicle tire according to claim 1 , wherein the radial distance Bis at least equal to 0.10 times the radial height H and at most equal to 0.35 times the radial height H.
5 . The vehicle tire according to claim 1 , wherein the crown interface is distributed across a width A 1 at least equal to 0.1 times the axial width S.
6 . The vehicle tire according to claim 1 , wherein the crown interface comprises a cushion made of elastomer compound positioned at least partially between the stiffening element and the radially inner face of the crown.
7 . The vehicle tire according to claim 1 , wherein the crown interface is distributed across a width A 1 , and wherein the bead interface is distributed across a width B 1 at least equal to the width A 1 .
8 . The vehicle tire according to claim 1 , wherein the bead interface comprises a cushion made of elastomer compound at least partially in contact with the stiffening element and the axially inner face of the bead.
9 . The vehicle tire according to claim 8 , wherein the cushion made of elastomer compound of the bead interface is at least partially in contact with a reinforcing layer such that the cushion is delimited by the stiffening element, the axially inner face of the bead, and the reinforcing layer.
10 . The vehicle tire according to claim 1 , wherein each stiffening element comprises a material selected from the group consisting of an aliphatic polyamide polymeric material, an aromatic polyamide polymeric material, a polyester polymeric material, a metal material, a glass material, a carbon material and combinations thereof.
11 . The vehicle tire according to claim 1 , wherein the filamentary reinforcing elements of each stiffening element are mutually parallel and form, with a circumferential direction of the vehicle tire, an angle C 1 at least equal to 85° and at most equal to 95°.
12 . The vehicle tire according to claim 1 , wherein the filamentary reinforcing elements of each stiffening element comprise:
first filamentary reinforcing elements, which are mutually parallel and which form, with a circumferential direction of the vehicle tire, an angle C 1 at least equal to 45° and at most equal to 75°, and
filamentary reinforcing elements, which are mutually parallel and which form, with a circumferential direction of the vehicle tire, an angle C 2 at least equal to 45° and at most equal to 75°, the second filamentary reinforcing elements being crossed with respect to the first filamentary reinforcing elements.
13 . The vehicle tire according to claim 12 , wherein the angles C 1 and C 2 are equal in terms of absolute value and opposite.
14 . The vehicle tire according to claim 1 , wherein the radial distance B is at least equal to 0.25 times the radial height H and at most equal to 0.5 times the radial height H.
15 . The vehicle tire according to claim 1 , wherein the crown interface of each stiffening element is formed by a first longitudinal end portion of the stiffening element, is connected to the radially inner face of the crown, and the bead interface of each stiffening element is formed by a second longitudinal end portion of the stiffening element, connected to the axially inner face of the bead, such that, when working under tension, each stiffening element extends in length, between the crown interface and the bead interface of the stiffening element, in a straight direction inclined with respect to the equatorial plane.