Pneumatic system including an improved bead with three continuous wire reinforcement elements

Abstract

The tire comprises axially discontinuous inner (38), outer (40), and additional (42) continuous wire reinforcement elements, each with respect to the others and having breaking strengths F1, F2, F3 and a number of complete turns N1, N2, N3, respectively. The axially outer continuous wire reinforcement element (40) is arranged axially between the axially inner (38) and additional (42) continuous wire reinforcement elements. A portion (36A) of the carcass layer (36) is arranged axially between the axially inner (38) and outer (40) continuous wire reinforcement elements. DEXT2 / DEXT1 < 1.00 and 0.50 ≤ (N1 x F1) / ((N2 x F2) + (N3 x F3)) ≤ 1.30. Figure for the abbreviation: Fig 5

Description

Title of the invention: A tire comprising an improved bead with three continuous wire reinforcement elements

[0001] The present invention relates to a tire, preferably a tire for a passenger vehicle.

[0002] A tire, a view of which in a meridional cross-section is shown in [Fig. 1], is known from the prior art. It has a substantially toroidal shape about an axis of revolution substantially coinciding with the axis of rotation of the tire. The tire comprises a crown, two sidewalls, and two bead ribs, each sidewall connecting each bead to the crown. The tire also comprises a carcass reinforcement anchored in each bead and extending into each sidewall and radially inwardly to the crown.

[0003] Each bead comprises an axially internal continuous wire reinforcement element arranged axially within a portion of the frame reinforcement and an axially external continuous wire reinforcement element arranged axially outside the portion of the frame reinforcement. Each axially internal and external continuous wire reinforcement element comprises several circumferential turns, around the axis of revolution, radially superimposed one on top of the other. Each continuous wire reinforcement element comprises a radially external free end and a radially internal free end.

[0004] In order to improve grip on dry surfaces, particularly when used on racetracks, some users of this tire habitually lower the tire inflation pressure, sometimes even below the minimum threshold recommended by the tire manufacturer. In these cases of use, which lead to extreme stresses on the tire, each bead is subjected to extremely high forces, which can lead to cracking at the interface between the radially external free end of the axially external continuous wire reinforcement element and the elastomeric matrix in which it is embedded.

[0005] The invention aims to eliminate any risk of cracking.

[0006] To this end, the invention relates to a tire of substantially toroidal shape about an axis of revolution, comprising a crown, two sidewalls, and two bead sections, each sidewall connecting each bead to the crown, the tire comprising: - a carcass reinforcement comprising at least one layer of carcass anchored in each bead section, - at least one continuous axially internal wire reinforcement element having a breaking strength Fl measured according to ASTM D 2969-00 and extending to less partly in one of the ridges and comprising NI>2 complete circumferential turns around the axis of revolution radially superimposed on each other, the continuous axially internal wire reinforcement element extending radially between a radially external dimension CEXT1 and a radially internal dimension CINT1, - at least one axially external continuous wire reinforcement element having a breaking strength F2 measured according to ASTM D 2969-00 and extending at least partially into said bead and comprising N2>2 complete circumferential turns around the axis of revolution radially superimposed on each other, the axially external continuous wire reinforcement element extending radially between a radially external dimension CEXT2 and a radially internal dimension CINT2, - at least one additional axially continuous wire reinforcement element having a breaking strength F3 measured according to ASTM D 2969-00 and extending at least partially into said bead and comprising N3>1 complete circumferential turn(s) around the axis of revolution radially superimposed on each other, - the continuous axially internal, external and additional wire reinforcement elements being discontinuous each with respect to the others, - the external axially continuous wire reinforcement element being arranged axially between the internal axially continuous wire reinforcement element and the additional axially continuous wire reinforcement element, - at least a portion of the at least one carcass layer being arranged axially between the internal axially continuous wire reinforcement element and the external axially continuous wire reinforcement element, - said bead having a reference point defined as the intersection between: - an imaginary line extending in a direction parallel to the average direction of the portion of the carcass layer or portions of the carcass layers arranged axially between the internal axially continuous wire reinforcement element and the external axially continuous wire reinforcement element, and - an external surface of the bead, the point(s) of the axially internal continuous wire reinforcement element having the radially external dimension CEXT1 being located at a radial distance DEXT1 from the reference point, the point(s) of the axially external continuous wire reinforcement element having the radially external dimension CEXT2 being located at a radial distance DEXT2 from the reference point, the tire being such that DEXT2 / DEXT1 < 1.00 and 0.50 < (NI x F1) / ((N2 x F2) + (N3xF3)) < 1.30.

[0007] By moving the radially external free end of the axially external continuous wire reinforcement element inward relative to that of the axially internal continuous wire reinforcement element, i.e., such that DEXT2 / DEXT1 < 1.00, the axially external continuous wire reinforcement element, particularly its radially external free end, is moved away from an area where bending stresses are significant. This prevents the axially external continuous wire reinforcement element, particularly its radially external free end, from being exposed to these bending stresses, which could increase the risk of cracking.

[0008] The presence and dimensioning of the additional axially continuous wire reinforcement element make it possible to compensate for the radial displacement of the radially external free end of the axially external continuous wire reinforcement element radially towards the inside and thus to maintain the anchoring function of the carcass layer provided by the continuous wire reinforcement elements.

[0009] Such solutions are highly advantageous, particularly compared to conventionally used solutions for reducing the risk of cracking, such as the use of elastomeric matrices with high crack resistance. Indeed, while such elastomeric matrices may solve the problem, they degrade the tire's handling characteristics, especially its drift stiffness, due to their low modulus.

[0010] Another advantage of the invention is that, given the improved resistance to cracking, it allows for increased grip on dry surfaces. Thus, it may be possible to recommend driving at a lower pressure than the recommended pressure for a prior art tire and, consequently, improve grip on dry surfaces. It may also be possible to use a tire tread whose composition improves grip on dry surfaces; this gain in grip then significantly increases the risk of cracking for a prior art tire, whereas it has no consequence with the tire according to the invention.

[0011] A complete circumferential turn is defined as a portion of the continuous wire reinforcement element describing, from a reference azimuth, an angle of 360° around the axis of revolution of the tire. Conversely, an incomplete circumferential turn describes, from a reference azimuth, only an angle of less than 360° around the axis of revolution of the tire. Each continuous wire reinforcement element can consist of N1, N2, N3 complete circumferential turn(s), respectively. without incomplete circumferential turn or being made up respectively of NI, N2, N3 complete circumferential turn(s) and one incomplete circumferential turn.

[0012] The radially outside dimension of a continuous wire reinforcement element is the radial dimension of the outermost radially outside point(s) of said continuous wire reinforcement element. This radially outside dimension is not necessarily the radial dimension of the outermost radial end of said continuous wire reinforcement element. Similarly, the radially inside dimension of a continuous wire reinforcement element is the radial dimension of the innermost radially inside point(s) of said continuous wire reinforcement element. This radially inside dimension is not necessarily the radial dimension of the innermost radial end of said continuous wire reinforcement element.

[0013] By discontinuous with respect to each other, it is understood that the axially continuous inner wire reinforcement element and the axially continuous outer wire reinforcement element are not continuous with each other, that the axially continuous inner wire reinforcement element and the additional axially continuous wire reinforcement element are not continuous with each other, and that the axially continuous outer wire reinforcement element and the additional axially continuous wire reinforcement element are not continuous with each other.

[0014] The axially external continuous wire reinforcement element is arranged axially between the axially internal continuous wire reinforcement element and the additional axially continuous wire reinforcement element means that at least a portion of the axially external continuous wire reinforcement element extends between at least a portion of the axially internal continuous wire reinforcement element and at least a portion of the additional axially continuous wire reinforcement element.

[0015] At least a portion of the carcass layer is arranged axially between the axially inner continuous wire reinforcement element and the axially outer continuous wire reinforcement element means that at least a portion of the carcass layer extends between at least a portion of the axially inner continuous wire reinforcement element and at least a portion of the axially outer continuous wire reinforcement element.

[0016] According to one feature of the invention, each axially continuous internal, external, and additional wire reinforcement element extends radially at least partially into the bead. Thus, the radially internal dimension of each axially continuous internal, external, and additional wire reinforcement element lies between the radially internal and external dimensions radially delimiting the bead.

[0017] By continuous, it is understood that each constituent material of the wire reinforcement element is monolithic along the wire reinforcement element. Thus, for example, if the wire reinforcement element comprises an assembly of several metallic monofilaments, each metallic monofilament is monolithic and therefore uninterrupted between the two free ends of the wire reinforcement element.

[0018] By wire, we mean an element extending longitudinally along a principal axis and having a cross-section perpendicular to the principal axis, the largest dimension G of which is relatively small compared to the dimension L along the principal axis. Relatively small means that L / G is greater than or equal to 100, preferably greater than or equal to 1000. This definition covers both wire elements with a circular cross-section and wire elements with a non-circular cross-section, for example, a polygonal or oblong cross-section. Most preferably, each wire element has a circular cross-section.

[0019] When the carcass reinforcement comprises a single carcass layer anchored in each bead between the continuous wire reinforcing elements, the average direction of the portion of the carcass layer arranged axially between the axially inner and outer continuous wire reinforcing elements is the direction of the line joining the radially inner and outer ends of said portion of the carcass layer. The radially inner end of said portion is located at a radial dimension coinciding with the outermost radial dimension of CINT1 and CINT2. The radially outer end of said portion is located at a radial dimension coinciding with the innermost radial dimension of CEXT1 and CEXT2.

[0020] When the carcass reinforcement comprises several carcass layers anchored in each bead between the continuous wire reinforcing elements, the average direction of the portions of the carcass layers arranged axially between the axially internal and external continuous wire reinforcing elements is the direction of the line joining the midpoints of the segments joining the radially internal and external ends of said portions of the carcass layers. The radially internal ends of said portions are located at a radial dimension coinciding with the outermost radial dimension of CINT1 and CINT2. The radially external ends of said portions are located at a radial dimension coinciding with the innermost radial dimension of CEXT1 and CEXT2.

[0021] The measurement of each breaking force Fl, F2, F3 is carried out according to ASTM D 2969-00. The measurement is performed on a tensile testing machine equipped with a gripping system capable of reaching the breaking force Fm of the reinforcing element. The grippers used must allow for extension of the reinforcing element until failure occurs outside the Gripping zone of the clamps. Clamps with a gradual curvature are therefore preferentially used. The measurement consists of recording the force-stretch curve of the reinforcing element until failure occurs. The measurement is considered valid when the point of failure is located in the area between the clamps, outside the gripping zone of the reinforcing element. The breaking force corresponds to the maximum stress that the reinforcing element can withstand during the test.

[0022] By axial direction, we mean the direction substantially parallel to the axis of revolution of the tire, that is to say the axis of rotation of the tire.

[0023] By circumferential direction, we mean the direction which is substantially perpendicular to both the axial direction and to a radius of the tire (in other words, tangent to a circle whose center is on the axis of rotation of the tire).

[0024] By radial direction, we mean the direction along a radius of the tire, that is to say any direction intersecting the axis of rotation of the tire and substantially perpendicular to this axis.

[0025] By median plane of the tire (denoted M), we mean the plane perpendicular to the axis of rotation of the tire which is located at mid-axial distance of the two ribs and passes through the axial midpoint of the apex reinforcement.

[0026] By circumferential equatorial plane of the tire, we mean the theoretical cylindrical surface passing through the equator of the tire, perpendicular to the median plane and to the radial direction. The equator of the tire is, in a meridian cutting plane (plane perpendicular to the circumferential direction and parallel to the radial and axial directions) the axis parallel to the axis of rotation of the tire and located equidistant between the outermost radial point of the tread intended to be in contact with the ground and the innermost radial point of the tire intended to be in contact with a support, for example a rim, the distance between these two points being equal to H.

[0027] By meridian plane, we mean a plane parallel to and containing the axis of rotation of the tire and perpendicular to the circumferential direction.

[0028] By bead, we mean the portion of the tire designed to allow the tire to be attached to a mounting support, for example a wheel including a rim. Thus, each bead is specifically designed to be in contact with a hook on the rim enabling its attachment.

[0029] Any interval of values ​​designated by the expression "between a and b" represents the domain of values ​​going from more than a to less than b (i.e. excluding bounds a and b) while any interval of values ​​designated by the expression "from a to b" means the domain of values ​​going from a to b (i.e. including the strict bounds a and b).

[0030] In preferred embodiments of the invention, the tires are intended for passenger vehicles as defined in the European Tyre and Rim Technical Organisation (ETRTO) standard, 2024. Such a tire has a cross-section in a meridional plane characterized by a section height H and a nominal section width or bead size S as defined in the European Tyre and Rim Technical Organisation (ETRTO) standard, 2024, such that the H / S ratio, expressed as a percentage, is at most 90 and at least 20, and the nominal section width S is at least 115 mm and at most 385 mm. Furthermore, the hook diameter D, defining the diameter of the tire's mounting rim, is at least 12 inches and at most 30 inches.

[0031] In advantageous and optional embodiments, 0.60 < (NI x F1) / ((N2 x F2) + (N3 x F3)), preferably 0.70 < (NI x F1) / ((N2 x F2) + (N3 x F3)), and more preferably 0.80 < (NI x F1) / ((N2 x F2) + (N3 x F3)). This avoids unnecessarily oversizing the external and additional axially continuous wire reinforcement elements relative to the internal axially continuous wire reinforcement element.

[0032] In advantageous and optional embodiments, (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.20, preferably (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.10 and more preferably (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.00. Thus, a relatively high resistance to dislodging performance is ensured thanks to the dimensioning of the additional axially continuous wire reinforcement element.

[0033] In advantageous and optional embodiments, DEXT2 / DEXT1 < 0.95, preferably DEXT2 / DEXT1 < 0.93. Thus, the axially external continuous wire reinforcement element is moved even further away from the area in which bending stresses are significant.

[0034] In a first configuration, Fl, F2 and F3 are such that 0.85 < F1 / F2 < 1.15, 0.85 < F2 / F3 < 1.15 and 0.85 < F3 / F1 < 1.15.

[0035] In this first configuration, the continuous internal, external, and additional axially oriented wire reinforcement elements are, for example, identical, which simplifies the industrial management of the reinforcement elements. Identical wire reinforcement elements can have breaking strength values ​​that are otherwise identical, or at least close, within the limits of industrial variability.

[0036] In this first configuration, we have advantageously and optionally NI > N2 > N3. Preferably, 6 < NI < 10 and / or 4 < N2 < 8 and / or 2 < N3 < 6.

[0037] In a second configuration, Fl, F2 and F3 are such that: - F1 / F2 is strictly less than 0.85 or is strictly greater than 1.15 and / or - F2 / F3 is strictly less than 0.85 or is strictly greater than 1.15, and / or - F3 / F1 is strictly less than 0.85 or is strictly greater than 1.15.

[0038] In this second configuration, at least one of the continuous axially internal, external and additional wire reinforcement elements is different from the others so as to optimize the dimensioning of these elements despite the increased complexity of the industrial management of the reinforcement elements.

[0039] In advantageous and optional embodiments, DEXT1 < 25 mm, preferably 5 mm < DEXT1 < 25 mm. Thus, the axially internal continuous wire reinforcement element, and more particularly its radially external end, is moved even further away from the area where bending stresses are significant.

[0040] In advantageous and optional applicable embodiments, DEXT2 < 24 mm, preferably 8 mm < DEXT2 < 24 mm. Thus, the axially external continuous wire reinforcement element, and more particularly its radially external end, is moved away from the area in which bending stresses are significant.

[0041] In advantageous and optional embodiments, the point(s) of the axially internal continuous wire reinforcement element having the radially internal dimension CINT1 being located at a radial distance DINT1 from the reference point, the point(s) of the axially external continuous wire reinforcement element having the radially internal dimension CINT2 being located at a radial distance DINT2 from the reference point, the additional axially continuous wire reinforcement element extending radially between a radially external dimension CEXT3 and a radially internal dimension CINT3, the point(s) of the additional axially continuous wire reinforcement element having the radially internal dimension CINT3 being located at a radial distance DINT3 from the reference point, DINT2 / DINT3 < 1.00 and DINT1 / DINT3 < 1.00.This prevents the additional axially continuous wire reinforcement element from being too close to the outer surface of the bead in order to protect it, and more specifically its radially inner end.

[0042] In advantageous and optional embodiments, DINT3 > 10 mm, preferably 10 mm < DINT3 < 20 mm. Such a distance makes it possible to protect the additional axially continuous wire reinforcement element and more particularly its radially inner end.

[0043] In advantageous and optional embodiments, the additional axially continuous wire reinforcement element extending radially between a radially external dimension CEXT3 and a radially internal dimension CINT3, the point(s) of the additional axially continuous wire reinforcement element having the radially external dimension CEXT3 being located at a radial distance DEXT3 of the reference point, DEXT3 / DEXT2 < 1.00. Thus, we prevent the additional axially continuous wire reinforcement element from being too close to the external surface of the bead, which allows it to be protected, and more particularly its radially external end.

[0044] In advantageous and optional embodiments, DEXT3 / DEXT2 < 0.95, preferably DEXT3 / DEXT2 < 0.90. This provides even more protection to the additional axially continuous wire reinforcement element and more particularly to its radially external end.

[0045] In advantageous and optional embodiments, DEXT3 / DEXT1 < 1.00, preferably DEXT3 / DEXT1 < 0.90, preferably DEXT3 / DEXT1 < 0.80. Thus, the additional axially continuous wire reinforcement element and, more particularly, its radially external end are further protected.

[0046] In advantageous and optional embodiments, DEXT3 < 20 mm, preferably 10 mm < DEXT3 < 20 mm. Such a distance makes it possible to protect the additional axially continuous wire reinforcement element and, more particularly, its radially external end.

[0047] In advantageous and optional embodiments, the point(s) of the axially internal continuous wire reinforcement element having the radially internal dimension CINT1 being located at a radial distance DINT1 from the reference point, the point(s) of the axially external continuous wire reinforcement element having the radially internal dimension CINT2 being located at a radial distance DINT2 from the reference point, DINT1 / DINT2 < 1.00. Thus, the axially external continuous wire reinforcement element is not too close to the external surface of the bead in order to protect it, and more particularly its radially internal end.

[0048] In advantageous and optional embodiments, DINT1 > 5 mm, preferably 5 mm < DINT1 < 10 mm. Such a distance makes it possible to protect the axially internal continuous wire reinforcement element and more particularly its radially internal end.

[0049] In advantageous and optional embodiments, DINT2 > 8 mm, preferably 8 mm < DINT2 < 15 mm. Such a distance makes it possible to protect the axially external continuous wire reinforcement element and, more particularly, its radially internal end.

[0050] In advantageous and optional embodiments, the axially external continuous wire reinforcement element comprising a radially external free end, the radially external free end is, at the azimuth of the radially external free end, arranged radially between: - at least a first portion of the axially external continuous wire reinforcement element, this first portion being arranged radially outside the radially external free end, and - at least a second portion of the axially external continuous wire reinforcement element, this second portion being arranged radially inside the radially external free end.

[0051] By moving the radially external free end away from the areas where stress concentrations are highest, the risk of cracking is further reduced. Here, the radially external free end is characterized as being sandwiched between two portions of the axially external continuous wire reinforcement element. An implicit consequence is that one portion of the axially external continuous wire reinforcement element intersects at least one other portion of the axially external continuous wire reinforcement element, the number of intersections depending on the positions of the first and second portions.

[0052] By free ends, it is understood that the two radially inner and outer ends are not joined to each other by a joining means, for example by a sleeve.

[0053] In advantageous and optional embodiments, in order to avoid the radially external free end being positioned on the path of another portion of the axially external continuous wire reinforcement element, which could cause instability during the manufacture of the tire and thus an area of ​​the axially external continuous wire reinforcement element that could be susceptible to cracking, the first portion of the axially external continuous wire reinforcement element arranged radially outside the radially external free end and the second portion of the axially external continuous wire reinforcement element arranged radially inside the radially external free end are radially consecutive.

[0054] By radially consecutive, it is understood that the first and second portions are arranged so that, at the azimuth of the free end considered, there are no other portions of the continuous axially external radially intercalated wire reinforcement element between each radially external and internal portion of the free end considered, except for the free end considered.

[0055] In advantageous and optional embodiments, the first portion of the axially external continuous wire reinforcement element arranged radially outside the radially external free end is, at the azimuth of the radially external free end, the portion most radially outside the axially external continuous wire reinforcement element.

[0056] Thus, the number of crossings between portions of the continuous wire reinforcement element is minimized, and consequently, the local excess thickness in each tire bead is reduced. Therefore, here, there is only one crossing between two axially external portions of the continuous wire reinforcement element.

[0057] In advantageous and optional embodiments, in order to ensure that the tire includes the expected number of circumferential turns around the entire circumference of the tire for the axially external continuous wire reinforcement element, the azimuth of the radially external free end of the axially external continuous wire reinforcement element and the azimuth of the radially internal free end of the axially external continuous wire reinforcement element are separated from each other by an angular gap of between 90° and 180°.

[0058] Similarly, in advantageous and optional embodiments, the azimuth of the radially external free end of the axially internal and / or additional continuous wire reinforcement element and the azimuth of the radially internal free end of the axially internal and / or additional continuous wire reinforcement element are separated from each other respectively by an angular gap of between 90° and 180°.

[0059] Furthermore, by angularly offsetting the azimuth of the radially outer free end and the azimuth of the radially inner free end of one or more continuous wire reinforcement elements, the uniformity of the tire is improved by distributing the mass of the continuous wire reinforcement element(s).

[0060] In advantageous and optional embodiments, each axially continuous internal, external and additional wire reinforcement element comprises an assembly of several elementary metallic monofilaments.

[0061] By elementary metallic monofilament, we mean a monolithic filament made entirely of one or more metals or metal alloys. Such elementary metallic monofilaments are produced, for example, by a casting process followed by a wire drawing process, and possibly followed by a metallic coating process. Such elementary metallic monofilaments are preferably made of steel, more preferably of carbon pearlitic (or ferritic-pearlitic) steel, hereinafter referred to as "carbon steel," or of stainless steel (by definition, steel containing at least 11% chromium and at least 50% iron). But it is of course possible to use other steels or other alloys.When carbon steel is advantageously used, its carbon content (% by weight of steel) preferably ranges from 0.05% to 1.2%, particularly from 0.5% to 1.1%; these contents represent a good compromise between the mechanical properties required for pneumatics and the feasibility of elementary metallic monofilaments. The metal used, whether it is carbon steel or other steel... The stainless steel can itself be coated with a metallic layer, improving, for example, the processing properties of the individual metallic monofilaments, or their performance properties, such as adhesion, corrosion resistance, or aging resistance. In a preferred embodiment, each individual metallic monofilament is coated with a layer of brass (Zn-Cu alloy), zinc, or bronze. Each individual metallic monofilament is, as described above, preferably made of carbon steel and has a mechanical strength ranging from 1000 MPa to 5000 MPa.Such mechanical strengths correspond to the steel grades commonly encountered in the tire industry, namely NT (Normal Tensile), HT (High Tensile), ST (Super Tensile), SHT (Super High Tensile), UT (Ultra Tensile), UHT (Ultra High Tensile), and MT (Mega Tensile). The use of high mechanical strengths potentially allows for improved reinforcement of the matrix in which the elementary metallic monofilaments are to be embedded, and a reduction in the weight of the reinforced matrix. The matrix, or assembly of several elementary metallic monofilaments, can be coated with a polymeric composition, for example, as described in US20160167438.

[0062] In advantageous and optional embodiments, the axially external continuous wire reinforcement element extends fully into the bead.

[0063] In order to limit the radial height of the axially external continuous wire reinforcement element and to avoid exposing it to bending stresses that could increase the risk of cracking, particularly at the radially external free end, the axially external continuous wire reinforcement element extends radially throughout the entire flange. In other words, the flange encompasses the entire axially external continuous wire reinforcement element. Thus, the radially internal dimension CINT2 and the radially external dimension CEXT2 are located between the radially internal and external dimensions that radially define the flange.

[0064] Each bead is radially delimited by a lower radial dimension and an upper radial dimension. The inner radial dimension is defined, on a meridian cutting plane, by an axial line passing through the innermost axial point of the bead. The upper radial dimension is defined, on a meridian cutting plane, by an axial line passing through the outermost radial contact point of the tire with the hook of the measuring rim defined by ETRTO - Standards Manual 2024 when the tire is mounted unloaded and inflated to a pressure of 2.5 bar on this measuring rim.

[0065] In advantageous and optional embodiments, the axially internal and / or additional continuous wire reinforcement element extends fully into the bead.

[0066] In advantageous and optional embodiments, the carcass layer anchored in each bead extends radially in each flank and axially radially inwardly at the top.

[0067] In embodiments enabling the performance of so-called radial tires, for example as defined by ETRTO, the carcass layer comprises wire carcass reinforcement elements, each wire carcass reinforcement element extending substantially along a principal direction forming an angle, in absolute value, of 80° to 90° with the circumferential direction of the tire. Alternatively, a variable angle of 80° to 90° may be used in at least a portion of the sidewall and strictly less than 80° in at least a portion of the crown, as described, for example, in US20190152262.

[0068] In a first embodiment, the carcass reinforcement comprises a single layer of carcass. In this first embodiment, the carcass reinforcement, with the exception of the single carcass layer, is devoid of any layer reinforced by wire reinforcement elements. The wire reinforcement elements of such reinforced layers excluded from the tire carcass reinforcement include metallic wire reinforcement elements and textile wire reinforcement elements. Most preferably, the carcass reinforcement consists of the single layer of carcass.

[0069] In this first variant, at least a portion of the single carcass layer is arranged axially between the internal axially continuous wire reinforcement element and the external axially continuous wire reinforcement element.

[0070] In a second variant, particularly usable for tires requiring additional reinforcement of the carcass reinforcement, the carcass reinforcement comprises an inner carcass layer and an outer carcass layer arranged radially and / or axially outside the radially inner carcass layer.

[0071] In this second variant, at least a portion of the inner carcass layer and at least a portion of the outer carcass layer are arranged axially between the inner axially continuous wire reinforcement element and the outer axially continuous wire reinforcement element.

[0072] In optional and advantageous embodiments, the tire is of the "HIGH LOAD CAPACITY" type. By increasing the load index of the tire compared to the load index of a tire of the same size in its "EXTRA-LOAD" version, the load capacity of the tire is increased without altering the interior space, compactness, and the comfort of the vehicle on which it is used. Indeed, since the dimensions of the tire of the invention are identical to those of the tire in its "EXTRA-LOAD" version, the tire does not take up any more space than the "EXTRA-LOAD" version. A "HIGH LOAD CAPACITY" type tire may bear a distinctive marking to differentiate it from its "STANDARD LOAD" and "EXTRA-LOAD" versions, for example, a marking of the type HL (for HIGH LOAD) or XL+ (for EXTRA LOAD +). Such a marking is notably disclosed in the ETRTO 2021 standard manual, page 3 of the General Notes - Passenger Car Tyres section to designate "HIGH LOAD CAPACITY" type tires. Examples of dimensions are also disclosed in the ETRTO 2021 standard manual, page 44, paragraph 9.1 of the Passenger Car Tyres - Tyres with metric designation section.A high-load-adjustable (HLA) tire can be characterized by its load index LI, where LI > LI' + 1, and LI' is the load index of an "extra-load-adjustable" tire of the same size, according to the ETRTO 2021 standard manual. The load index LI' is the load index of an "extra-load" tire with the same dimensions, meaning the same nominal section width, the same nominal aspect ratio, the same construction (R and ZR being considered identical), and the same nominal rim diameter. The load index LI' is given in the ETRTO 2021 standard manual, specifically in the section entitled "Passenger Car Tyres - Tyres with Metric Designation," pages 22 to 43. Depending on the size, LI will be LI = LI' + 1, LI = Lr + 2, LI = Lr + 3, or LI = Lr + 4. In most embodiments, LI'+l < LI < LI'+4, and even LI'+2 < LI < LI'+4.

[0073] In order to manufacture the tire according to the invention, it may in particular be possible to carry out a process employing a rigid non-deformable support of substantially toroidal shape around the axis of revolution of the support, for example as described in WO03 / 101713, EP1094930, EP1463627 or EP0976535.

[0074] The invention and its advantages will be readily understood in the light of the detailed description and non-limiting embodiments that follow, and of Figures 1 to 9 relating to these examples in which: - Fig. 1 is a view in the meridian cross-section of a tire according to the prior art, - [Fig.2] is a view similar to that of [Fig.1] of a tire according to a first embodiment of the invention in a cutting plane including the azimuth AzO of [Fig.3], - [Fig.3] is a view of a continuous, axially external wire reinforcement element of the tire in [Fig.2], - [Fig.4] is a detailed view of part IV of [Fig.3], - Figure 5 is a detailed view of the bead of the tire in Figure 2; Figures 6 and 7 are views similar to those in Figures 2 and 5 of a tire according to a second embodiment of the invention; and - [Fig. 8] is a view analogous to that of Figures 2 and 6 of a tire according to a third embodiment of the invention, and - [Fig.9] is a view similar to that of figures 2, 6 and 8 of a tire according to a fourth embodiment of the invention.

[0075] In the figures relating to the tire, a reference frame X, Y, Z has been represented corresponding to the usual directions respectively axial (Y), radial (Z) and circumferential (X) of a tire.

[0076] Figure 3 shows a tire according to the invention, designated by the general reference numeral 10. The tire 10 has a substantially toroidal shape around an axis of revolution A substantially parallel to the axial direction Y. The tire 10 is intended for a passenger vehicle and has dimensions HL275 / 35ZR21 (105Y). In the various figures, the tire 10 is shown in its new condition, i.e., having not yet been driven on.

[0077] The tire 10 includes a crown 12 comprising a tread 14 intended to come into contact with the ground during rolling and a crown reinforcement 16 extending into the crown 12 in the circumferential direction X. The tire 10 also includes a sealing layer 18 for an inflation gas intended to delimit a closed internal cavity with a mounting support for the tire 10 once the tire 10 is mounted on the mounting support, for example a rim. The sealing layer 18 is butyl-based.

[0078] The top reinforcement 16 includes a working reinforcement 20 and a shrinkage reinforcement 22.

[0079] The working frame 16 comprises at least one working layer and here comprises two working layers 24, 26. The radially inner working layer 24 is arranged radially inside the radially outer working layer 26.

[0080] The shrink-fit armature 22 comprises at least one shrink-fit layer and here comprises a shrink-fit layer 28.

[0081] The top reinforcement 16 is radially surmounted by the tread 14. The shrinkage reinforcement 22, here the shrinkage layer 28, is arranged radially outside the working reinforcement 20 and is therefore radially interposed between the working reinforcement 20 and the tread 14. Preferably, the shrinkage reinforcement 22 may be considered to have an axial width at least as large as the axial width of the working reinforcement 20 and, in this case, in the embodiment illustrated in [Fig.2], the shrinkage reinforcement 22 has an axial width greater than the axial width of the working reinforcement 20.

[0082] The tire 10 comprises two sidewalls 30 extending radially inwards from the apex 12. The tire 10 further comprises two beads 32 radially inwards from the sidewalls 30. Each sidewall 30 connects each bead 32 to the apex 12.

[0083] Each bead 32 is radially delimited by a lower radial dimension R0 and an upper radial dimension RL. Each bead has an external surface 33 in contact either with a mounting support or with the inflation gas of the internal cavity when the tire 10 is mounted on the mounting support.

[0084] The tire 10 includes a carcass reinforcement 34 anchored in each bead 32. The carcass reinforcement 34 extends radially in each sidewall 30 and axially radially inwardly at the crown 12. The crown reinforcement 16 is arranged radially between the tread 20 and the carcass reinforcement 34. The carcass reinforcement 34 comprises at least one carcass layer and here comprises a single carcass layer 36. In this case, the carcass reinforcement 34 consists of the single carcass layer 36.

[0085] Each working layer 24, 26 of the shrink-fit layer 28 and of the frame layer 36 comprises an elastomeric matrix in which one or more wire reinforcement elements of the corresponding layer are embedded. Thus, each working layer 24, 26 comprises working wire reinforcement elements, the shrink-fit layer 28 comprises shrink-fit wire reinforcement elements, and the frame layer 36 comprises frame wire reinforcement elements.

[0086] The wire reinforcement elements for the reinforcement are textile and are circumferentially helically wound along a principal direction forming, with the circumferential direction X of the tire 10, an angle, in absolute value, less than or equal to 10°, preferably less than or equal to 7° and more preferably less than or equal to 5°. The wire reinforcement elements for the working layer are metallic and extend substantially parallel to each other within each working layer 24, 26 along principal directions forming, with the circumferential direction X of the tire 10, angles of opposite orientations between the two working layers 24, 26 and, in absolute value, strictly greater than 10°, preferably ranging from 15° to 50° and more preferably ranging from 25° to 45°.The carcass wire reinforcement elements are textile and extend along a principal direction forming with the circumferential direction X of the tire 10 an angle, in absolute value, greater than or equal to 60°, preferably ranging from 80° to 90° and here substantially equal to 90°. Each wire reinforcement element of the band and carcass is, for example, identical to those described in applications WO2021250331, WO2022074341 or WO2022069819.

[0087] The tire 10 comprises an axially internal continuous wire reinforcement element 38, an axially external continuous wire reinforcement element 40 and a axially additional continuous wire reinforcement element 42. Each axially continuous wire reinforcement element internal 38, external 40 and additional 42 extends at least partly into one of the ridges 32 and here entirely into the ridge 32.

[0088] The axially continuous internal wire reinforcement elements 38, external 40 and additional 42 are discontinuous with respect to each other.

[0089] The axially external continuous wire reinforcement element 40 is arranged axially between the axially internal continuous wire reinforcement element 38 and the additional axially continuous wire reinforcement element 42. At least a portion of the carcass reinforcement 34 is arranged axially between the axially internal continuous wire reinforcement element 38 and the axially external continuous wire reinforcement element 40. Here, a portion 36A of the carcass layer 36 is arranged axially between the axially internal continuous wire reinforcement element 38 and the axially external continuous wire reinforcement element 40.

[0090] Each axially internal continuous wire reinforcement element 38, external 40, and additional 42 comprises, respectively, an axially internal wire cable 38, external 40, and additional 42 comprising an assembly of several elementary metal monofilaments, including an assembly of an inner layer of two elementary carbon steel monofilaments of 0.35 mm diameter wound helically with a 7.5 mm pitch and an outer layer of seven elementary carbon steel monofilaments of 0.35 mm diameter wound helically around the inner layer with a 15 mm pitch. Such cables are referred to as 9.35 cables in accordance with current nomenclature and are, for example, described in US20080066843.

[0091] The axially continuous inner 38, outer 40 and additional 42 wire reinforcement elements have breaking forces respectively Fl, F2, F3 measured according to ASTM D 2969 - 00 such that 0.85 < F1 / F2 < 1.15, 0.85 < F2 / F3 < 1.15 and 0.85 < F3 / F1 < 1.15. Here Fl=F2=F3=1980 N.

[0092] With reference to [Fig. 5], the axially internal continuous wire reinforcement element 38 comprises NI complete circumferential turns greater than or equal to 2, with 6 < NI < 10. Here, the axially internal continuous wire reinforcement element 38 comprises Nl = 8 complete circumferential turns and one incomplete circumferential turn around the axis of revolution A, radially superimposed one on top of the other. The axially internal continuous wire reinforcement element 38 extends radially between a radially external dimension CEXT1 and a radially internal dimension CINT1.

[0093] As explained previously, the radially external dimension CEXT1 is the radial dimension of the most radially external point(s) of the axially internal continuous wire reinforcement element 38 and is here reached at the azimuth AzO at point 38A coincides with the radially outside end of the axially inside continuous wire reinforcement element 38. The radially inside dimension CINT1 is the radial dimension of the most radially inside point(s) of the axially inside continuous wire reinforcement element 38 and is here reached at the azimuth AzO at point 38B coincides with the radially inside end of the axially inside continuous wire reinforcement element 38.

[0094] With reference to Figures 4 and 5, the axially external continuous wire reinforcement element 40 comprises N2 complete circumferential turns greater than or equal to 2, with 4 < N2 < 8. Here, the axially external continuous wire reinforcement element 40 comprises N2 = 5 complete circumferential turns T1, T2, T3, T4, T5 and one incomplete circumferential turn T6 around the axis of revolution A, radially superimposed one on top of the other. The axially internal continuous wire reinforcement element 38 extends radially between a radially external dimension CEXT2 and a radially internal dimension CINT2.

[0095] As explained previously, the radially external dimension CEXT2 is the radial dimension of the outermost radially external point(s) of the axially external continuous wire reinforcement element 40 and does not correspond, in this case, to the radial dimension of the radially external end EL. As illustrated in [Fig. 4], the radially external dimension CEXT2 is reached here at azimuth Azl at point 40A. Also as explained previously, the radially internal dimension CINT2 of the axially external continuous wire reinforcement element 40 is the radial dimension of the innermost radially internal point(s) and corresponds, in this case, to the radial dimension of the radially internal end E2. As illustrated in [Fig. 4], the radially internal dimension CINT2 is reached here at azimuth Az2 at point 40B, which coincides with the end E2.

[0096] With reference to [Fig. 4], the axially external continuous wire reinforcement element 40 comprises a radially external free end El and a radially internal free end E2, the radially external free end El being arranged radially outside the radially internal free end E2. The complete circumferential turn T1 begins at the radially external end El, which defines a reference azimuth AzO. The complete circumferential turn T1 ends, after one complete circumferential turn around the axis of revolution A, before the azimuth AzO, from which the complete circumferential turn T2 then begins. The complete circumferential turn T2 ends, after one complete turn around the axis of revolution A, before the azimuth AzO, from which the complete circumferential turn T3 then begins.The complete circumferential revolution T3 ends, after one complete revolution around the axis of revolution A, before the azimuth AzO, from which the complete circumferential revolution T4 then begins. The complete circumferential revolution T4 ends, after one complete revolution around the axis of . revolution A, before the azimuth AzO, from which the complete circumferential turn T5 then begins. The complete circumferential turn T5 ends, after a complete turn around the axis of revolution A, before the azimuth AzO, from which the incomplete circumferential turn T6 then begins.

[0097] The radially external free end El of the axially external continuous wire reinforcement element 40 is, at the azimuth of the radially external free end El, here the reference azimuth AzO, arranged radially between: - a first portion 50 of the axially external continuous wire reinforcement element 40, this first portion 50 being arranged radially outside the radially external free end El, and - a second portion 52 of the axially external continuous wire reinforcement element 40, this second portion 52 being arranged radially inside the radially external free end EL

[0098] In this case, the radially external free end El is arranged radially between the first portion 50 distributed over the complete circumferential turns T1 and T2 and the second portion 52 distributed over the complete circumferential turns T2 and T3.

[0099] The first portion 50 and the second portion 52 are radially consecutive. The first portion 50 is, at the azimuth AzO of the radially external free end El, the portion most radially outside the axially external continuous wire reinforcement element 40. The end El is arranged radially between the first portion 50 distributed over the complete circumferential turns T1 and T2 and the second portion 52 distributed over the complete circumferential turns T2 and T3.

[0100] In figures 2 and 5 corresponding to the cross-sectional view along the cutting plane corresponding to the azimuth AzO of [Fig.4], the end El is materialized in the form of a circle filled with black.

[0101] With reference to [Fig. 5], the additional axially continuous wire reinforcement element 42 comprises N3 complete circumferential turns greater than or equal to 1, with 2 < N3 < 6. Here, the additional axially continuous wire reinforcement element 42 comprises N3 = 3 complete circumferential turns and one incomplete circumferential turn around the axis of revolution A, radially superimposed one on top of the other. The additional axially continuous wire reinforcement element 42 extends radially between a radially external dimension CEXT3 and a radially internal dimension CINT3.

[0102] Just as for the axially internal continuous wire reinforcement element 38, the radially external dimension CEXT3 is the radial dimension of the outermost point(s) of the additional axially continuous wire reinforcement element 42 and is here attained at azimuth AzO at point 42A coinciding with the radially external end of the axially continuous wire reinforcement element additional 42. The radially inside dimension CINT3 is the radial dimension of the most radially inside point(s) of the axially additional continuous wire reinforcement element 42 and is here reached at the azimuth AzO at point 42B coinciding with the radially inside end of the axially additional continuous wire reinforcement element 42.

[0103] The values ​​of NI, N2 and N3 satisfy NI > N2 > N3.

[0104] Portion 36A has a radially internal end V1 located at a radial dimension coinciding with the outermost radial dimension of CINT1 and CINT2, here CINT2. Portion 36A has a radially external end V2 located at a radial dimension coinciding with the innermost radial dimension of CEXT1 and CEXT2, here CEXT2.

[0105] The portion 36A of the carcass layer 36 has a mean direction defined as the direction of the line joining the radially inner end VI and outer end V2 of the portion 36A.

[0106] As illustrated in [Fig. 5], the bead 32 has a reference point 32A defined as the intersection between: - an imaginary line Di passing through the extremities VI, V2 and therefore extending in a direction parallel to the average direction of portion 36A, and - the external surface 33 of the bead 32.

[0107] Each point 38A, 40A, 42A having respectively the radially external dimension CEXT1, CEXT2, CEXT3 is located respectively at a radial distance DEXT1, DEXT2, DEXT3 from the reference point 32A satisfying DEXT2 / DEXT1 < 1.00, DEXT3 / DEXT2 < 1.00 and DEXT3 / DEXT1 < 1.00. More precisely, DEXT2 / DEXT1 < 0.95, preferably DEXT2 / DEXT1 < 0.93 and here DEXT2 / DEXT1 = 0.91. More precisely, DEXT3 / DEXT2 < 0.95, preferably DEXT3 / DEXT2 < 0.90 and here DEXT3 / DEXT2 = 0.85. More precisely, DEXT3 / DEXT1 < 0.90, preferably DEXT3 / DEXT1 < 0.80 and here DEXT3 / DEXT1=0.78.

[0108] In particular, DEXT1 < 25 mm, preferably 5 mm < DEXT1 < 25 mm and here DEXT1=23 mm, DEXT2 < 24 mm, preferably 8 mm < DEXT2 < 24 mm and here DEXT2=21 mm, DEXT3 < 20 mm, preferably 10 mm < DEXT3 < 20 mm and here DEXT3=18 mm.

[0109] Similarly, each point 38B, 40B, 42B having respectively the radially inside dimension CINT1, CINT2, CINT3 is located respectively at a radial distance DINT1, DINT2, DINT3 from the reference point 32A satisfying DINT2 / DINT3 < 1.00 and DINT1 / DINT3 < 1.00, DINT1 / DINT2 < 1.00.

[0110] In particular, DINT1 > 5 mm, preferably 5 mm < DINT1 <10 mm and here DINT1=8 mm, DINT2 > 8 mm, preferably 8 mm < DINT2 <15 mm and here DINT2=11 mm, DINT3 > 10 mm, preferably 10 mm < DINT3 < 20 mm and here DINT3=13 mm.

[0111] The axially continuous internal 38, external 40 and additional 42 wire reinforcement elements also satisfy the relation 0.50 < (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.30. In addition, the pneumatic 10 satisfies the relation 0.60 < (NI x F1) / ((N2 x F2) + (N3 x F3)), preferably 0.70 < (NI x F1) / ((N2 x F2) + (N3 x F3)) and more preferably 0.80 < (NI x F1) / ((N2 x F2) + (N3 x F3)). Finally, tire 10 satisfies the relation (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.20, preferably (NI x Fl) / ((N2 x F2) + (N3 x F3)) < 1.10 and more preferably (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.00. Indeed, the value (NI x F1) / ((N2 x F2) + (N3 x F3))=0.90.

[0112] Figure 6 illustrates a tire according to a second embodiment of the invention. Elements analogous to those illustrated in the preceding figures are designated by identical reference numerals.

[0113] Unlike the first embodiment, the carcass reinforcement 34 comprises two carcass layers. Here, the carcass reinforcement 34 comprises an inner carcass layer 36 and an outer carcass layer 37 arranged radially and axially outside the radially inner carcass layer 36. Similar to the radially inner carcass layer 36, the radially outer carcass layer 37 comprises carcass wire reinforcement elements extending along a principal direction forming with the circumferential direction X of the tire 10 an angle, in absolute value, greater than or equal to 60°, preferably ranging from 80° to 90° and here equal to 90°.

[0114] Portion 36A has a radially internal end Vli located at a radial dimension coinciding with the outermost radial dimension of CINT1 and CINT2, here CINT2. Portion 36A has a radially external end V2i located at a radial dimension coinciding with the innermost radial dimension of CEXT1 and CEXT2, here CEXT2.

[0115] The outer carcass layer 37 comprises a portion 37A arranged axially between the axially inner continuous wire reinforcement element 38 and the axially outer continuous wire reinforcement element 40. The portion 37A has a radially inner end Vie located at a radial dimension coinciding with the outermost radial dimension of CINT1 and CINT2, here CINT2. The portion 37A has a radially outer end V2e located at a radial dimension coinciding with the innermost radial dimension of CEXT1 and CEXT2, here CEXT2.

[0116] The portions 36A, 37A of the carcass layers 36, 37 have an average direction defined as the direction of the line joining, on the one hand, the midpoint V1 of the segment joining the radially internal extremities V1, V2i of the portions 36A, 37A and on the other hand the midpoint V2 of the segment joining the radially internal extremities Vie, V2e of the portions 36A, 37A.

[0117] In this second embodiment, the reference point 32A is defined as the intersection between: - an imaginary line Di passing through the extremities VI,V2 and therefore extending in a direction parallel to the average direction of portions 36A, 37A, and - the external surface 33 of the bulge 32.

[0118] Figures 8 and 9 illustrate tires according to third and fourth embodiments of the invention. Elements analogous to those illustrated in the preceding figures are designated by identical reference numerals.

[0119] Unlike the tires according to the preceding embodiments, in the tire according to the third embodiment illustrated in [Fig. 8], the internal axially continuous wire reinforcement element 38 differs from the external axially continuous wire reinforcement elements 40 and additional 42. In this case, each external axially continuous wire reinforcement element 40 and additional 42 comprises, respectively, an external axially continuous wire reinforcement element 40 and additional 42 comprising an assembly of several elementary metal monofilaments, each comprising an assembly of an inner layer of four elementary carbon steel monofilaments of 0.35 mm diameter wound helically with a 5 mm pitch and an outer layer of nine elementary carbon steel monofilaments of 0.35 mm diameter wound helically around the inner layer with a 10 mm pitch. Such cables are referred to as cables 13.35 in accordance with the current nomenclature and are described for example in US20080066843. The axially internal continuous wire reinforcement element 38 comprises a cable 9.35 as described previously. Thus, Fl, F2 and F3 are such that F1 / F2 is strictly less than 0.85 and that F3 / F1 is strictly greater than 1.15. In this case, Fl=1980 N, F2=F3=2870 N and Fl / F2=0.69 and F3 / F1=1.45.

[0120] Unlike the tires according to the preceding embodiments, in the tire according to the fourth embodiment illustrated in [Fig. 9], the axially external continuous wire reinforcement element 40 differs from the axially internal continuous wire reinforcement elements 38 and the additional 42. In this case, each axially internal continuous wire reinforcement element 38 and the additional 42 comprises a 9.35 cable, whereas the axially external continuous wire reinforcement element 40 comprises a 13.35 cable. Thus, Fl, F2, and F3 are such that F1 / F2 is strictly less than 0.85 and F2 / F3 is strictly greater than 1.15. In this case, Fl = 1980 N, F2 = F3 = 2870 N, and Fl / F2 = 0.69 and F2 / F3 = 1.45.

[0121] The invention is not limited to the embodiments described above.

[0122] Thus, for example, although this is not shown in the preceding figures, it is optionally preferred that the azimuth of the free end radially the external and the azimuth of the radially internal free end respectively of each axially internal, external and additional continuous wire reinforcement element are separated from each other by an angular gap between 90° and 180°, for example 120°.

Claims

1. Demands A tire (10) of substantially toroidal shape about an axis of revolution (A), comprising a vertex (12), two sidewalls (30), two ribs (32), each sidewall (30) connecting each rib (32) to the vertex (12), the tire (10) being characterized in that it comprises: - a carcass frame comprising at least one carcass layer (36; 36, 37) anchored in each bead (32), - at least one axially internal continuous wire reinforcement element (38) having a breaking strength Fl measured according to ASTM D 2969-00 and extending at least partially into one of the ribs (32) and comprising NI >2 complete circumferential turns around the axis of revolution (A) radially superimposed on each other, the axially internal continuous wire reinforcement element extending radially between a radially external dimension CEXT1 and a radially internal dimension CINT1, - at least one axially external continuous wire reinforcement element (40) having a breaking strength F2 measured according to ASTM D 2969-00 and extending at least partially into said bead (32) and comprising N2>2 complete circumferential turns around the axis of revolution (A) radially superimposed one on the other, the axially external continuous wire reinforcement element extending radially between a radially external dimension CEXT2 and a radially internal dimension CINT2, - at least one additional axially continuous wire reinforcement element (42) having a breaking strength F3 measured according to ASTM D 2969-00 and extending at least partially into said bead (32) and comprising N3>1 complete circumferential turn(s) around the axis of revolution (A) radially superimposed one on the other, the axially internal continuous wire reinforcement elements (38),exterior (40) and additional (42) being discontinuous with respect to each other, the axially continuous outer wire reinforcement element (40) being arranged axially between the wire reinforcement element, axially continuous inner (38) and the additional axially continuous wire reinforcement element (42), at least a portion (36A; 36A, 37A) of at least one carcass layer (36; 36, 37) being arranged axially between the axially continuous inner wire reinforcement element (38) and the axially continuous outer wire reinforcement element (40), said bead (32) having a reference point (32A) defined as the intersection between: - an imaginary line (Di) extending in a direction parallel to the average direction of the portion (36A) of the carcass layer (36) or portions (36A, 37A) of the carcass layers (36, 37) arranged axially between the axially continuous inner wire reinforcement element (38) and the axially continuous outer wire reinforcement element (40), and - an external surface (33) of the bead,the point(s) (38A) of the axially internal continuous wire reinforcement element (38) having the radially external dimension CEXT1 being located at a radial distance DEXT1 from the reference point (32A), the point(s) (40A) of the axially external continuous wire reinforcement element (40) having the radially external dimension CEXT2 being located at a radial distance DEXT2 from the reference point (32A), the pneumatic being such that DEXT2 / DEXT1 < 1.00 and 0.50 < (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.30.,

2. Pneumatic (10) according to the preceding claim, wherein 0.60 < (NI x F1) / ((N2 x F2) + (N3 x F3)), preferably 0.70 < (NI x F1) / ((N2 x F2) + (N3 x F3)) and more preferably 0.80 < (NI x F1) / ((N2 x F2) + (N3 x F3)).

3. Pneumatic (10) according to any one of the preceding claims, wherein (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.20, preferably (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.10 and more preferably (NI x F1) / ((N2 x F2) + (N3 x F3)) < 1.

00.

4. Pneumatic (10) according to any one of the preceding claims, wherein DEXT2 / DEXT1 < 0.95, preferably DEXT2 / DEXT1 < 0.

93.

5. Pneumatic (10) according to any one of the preceding claims, wherein DEXT1 < 25 mm, preferably 5 mm < DEXT1 < 25 mm.

6. Pneumatic (10) according to any one of the preceding claims, wherein DEXT2 < 24 mm, preferably 8 mm < DEXT2 < 24 mm.

7. Pneumatic (10) according to any one of the preceding claims, wherein one or more points (38B) of the axially internal continuous wire reinforcement element (38) having the radially internal dimension CINT1 are located at a radial distance DINT1 from the reference point (32A), one or more points (40B) of the axially external continuous wire reinforcement element (40) having the radially internal dimension CINT2 are located at a radial distance DINT2 from the reference point (32A), the additional axially continuous wire reinforcement element (42) extending radially between a radially external dimension CEXT3 and a radially internal dimension CINT3, one or more points (42B) of the additional axially continuous wire reinforcement element (42) having the radially internal dimension CINT3 are located at a radial distance DINT3 from the reference point (32A), DINT2 / DINT3 < 1.00 and DINT1 / DINT3 < 1.

00.

8. Pneumatic (10) according to the preceding claim, wherein DINT3 >10 mm, preferably 10 mm < DINT3 < 20 mm.

9. Pneumatic (10) according to any one of the preceding claims, wherein the additional axially continuous wire reinforcement element (42) extends radially between an outer radial dimension CEXT3 and an inner radial dimension CINT3, the point(s) (42A) of the additional axially continuous wire reinforcement element (42) having the outer radial dimension CEXT3 being located at a radial distance DEXT3 from the reference point (32A), DEXT3 / DEXT2 < 1.

00.

10. Pneumatic (10) according to the preceding claim, wherein DEXT3 / DEXT2 < 0.95, preferably DEXT3 / DEXT2 < 0.

90.

11. Pneumatic (10) according to claim 9 or 10, wherein DEXT3 < 20 mm, preferably 10 mm < DEXT3 < 20 mm.

12. Pneumatic (10) according to any one of the preceding claims, wherein the point(s) (38B) of the axially internal continuous wire reinforcement element (38) having the

13.

14.

15. radially inside dimension CINT1 being located at a radial distance DINT1 from the reference point (32A), the point or one of the points (40B) of the axially outside continuous wire reinforcement element (40) having the radially inside dimension CINT2 being located at a radial distance DINT2 from the reference point (32A), DINT1 / DINT2 < 1.

00. Pneumatic (10) according to the preceding claim, wherein DINT1 > 5 mm, preferably 5 mm < DINT1 < 10 mm. Pneumatic (10) according to claim 12 or 13, wherein DINT2 > 8 mm, preferably 8 mm < DINT2 < 15 mm. Pneumatic according to any one of the preceding claims, wherein, the axially external continuous wire reinforcement element (40) comprising an external radially free end (El), the external radially free end (El) is, at the azimuth (AzO) of the external radially free end (El), arranged radially between: - at least a first portion (50) of the axially external continuous wire reinforcement element (40), this first portion (50) being arranged radially outside the radially external free end (El), and - at least a second portion (52) of the axially external continuous wire reinforcement element (40), this second portion (52) being arranged radially inside the radially external free end (El).

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