WO2000041467A2 - Tyre with beads having improved structure - Google Patents

Tyre with beads having improved structure Download PDF

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Publication number
WO2000041467A2
WO2000041467A2 PCT/EP1999/010471 EP9910471W WO0041467A2 WO 2000041467 A2 WO2000041467 A2 WO 2000041467A2 EP 9910471 W EP9910471 W EP 9910471W WO 0041467 A2 WO0041467 A2 WO 0041467A2
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WO
WIPO (PCT)
Prior art keywords
bead
profile
axially
radially
outside
Prior art date
Application number
PCT/EP1999/010471
Other languages
French (fr)
Other versions
WO2000041467A3 (en
Inventor
Pierre Chandezon
Claude Eynard
Olivier Muhlhoff
Jean-Jacques Drieux
Original Assignee
Societe De Technologie Michelin
Michelin Recherche Et Technique S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societe De Technologie Michelin, Michelin Recherche Et Technique S.A. filed Critical Societe De Technologie Michelin
Priority to AU24345/00A priority Critical patent/AU2434500A/en
Publication of WO2000041467A2 publication Critical patent/WO2000041467A2/en
Publication of WO2000041467A3 publication Critical patent/WO2000041467A3/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0081—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion the carcass plies folded around or between more than one bead core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/02—Seating or securing beads on rims
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/02—Seating or securing beads on rims
    • B60C15/0236—Asymmetric bead seats, e.g. different bead diameter or inclination angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/02—Seating or securing beads on rims
    • B60C15/024—Bead contour, e.g. lips, grooves, or ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/02—Seating or securing beads on rims
    • B60C15/024—Bead contour, e.g. lips, grooves, or ribs
    • B60C15/0247—Bead contour, e.g. lips, grooves, or ribs with reverse bead seat inclination, i.e. the axially inner diameter of the bead seat is bigger than the axially outer diameter thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C3/00—Tyres characterised by the transverse section
    • B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile

Definitions

  • the present invention relates to a tire intended to be mounted on a rim having at least one first frustoconical seat, the generator of which has an axially outer end closer to the axis of rotation than the axially inner end.
  • Such a tire is described in application WO 4/13498 from the applicant. It comprises at least a first bead, intended to be mounted on said first outboard seat inclined towards the outside, said first bead, of usual axial width and terminated axially on the outside by a bead point, having a bead seat of which the generator has its axially outer end closer to the axis of rotation than its axially inner end, said generator being extended axially outside by an outer face delimiting the bead tip, said face forming with the axis of rotation a angle ⁇ , open radially and axially outwards, and less than 90 °.
  • the radial carcass reinforcement of said tire anchored in each bead to at least one inextensible annular reinforcement element, has a meridian profile, when the tire is mounted on its service rim and inflated to its service pressure, with a sense of constant curvature in the sides and bead terminated by the point and which is such that, in said bead, the tangent to the point of tangency of said profile with the inextensible annular element of said bead made with the axis of rotation an angle 0 open towards the at least 70 ° outside.
  • the bead of such a tire, and more particularly the structure of the attachment of the carcass reinforcement can be variable.
  • the carcass reinforcement is anchored to an inextensible annular reinforcement element (generally a coated rod) in the usual way, that is to say say by winding said frame around said element to form a reversal starting from the base of the element and rising radially outwards.
  • the radial carcass reinforcement is anchored to the inextensible element by winding around said element going from the heel to the point of the bead to form a reversal extending in a profile of rubber mixture under wedge shape delimited by two sides from a vertex A located under the section of the coated rod, the radially outer side forming, with a parallel with the axis of rotation passing through said vertex A, an acute angle 0 ⁇ , open radially outward and between 20 ° and 70 °, and the radially inner side forming with said parallel an acute angle 02, open radially inward and between 0 ° and 30 °, and the rubber mixture forming the profile , axially adjacent to the rod, having a Shore A hardness at least equal to 65 and greater than the Shore A hardness (s) of the rubber mixes axially and radially above the rod and the profile.
  • the bead structures described above allow a modification (increase) of the tightening of the bead tip on the mounting rim as a function of the tension of the carcass reinforcement, which leads to having an initial tightening of the rim of low value knowing that said tightening will increase when the tire is inflated to its recommended pressure.
  • Said solutions have, when the rolling conditions of the tire are such that the beads are brought to high temperature, and at the end of their lifespan, weaknesses in endurance originating from a certain unwinding of the carcass reinforcement around the annular reinforcement element of the bead heel.
  • the object of the invention is to remedy the above-mentioned drawbacks while retaining the excellent anti-loosening properties of the tire in question.
  • the tire in accordance with the invention and seen in meridian section, comprises at least one first bead, the seat of which has a generator whose axially inner end is on a circle with a diameter greater than the diameter of the circle on which the axially outer end, the bead heel being axially on the inside, while the bead tip is axially on the outside, and a radial carcass reinforcement winding in each bead around at least one reinforcing element of heel, annular, inextensible and coated with rubbery mixture, going from the inside to the outside to form a reversal, extending in a profile of rubbery mixture in the form of a corner delimited by two sides coming from a localized vertex A under the section of the annular element, the radially external side forming, with a parallel with the axis of rotation passing through the said ver
  • the tire comprises a second bead whose seat has the same configuration as the seat of the first bead, that is to say a seat whose generator has an axially inner end on a circle of diameter greater than the diameter of the circle on which the axially outer end is located, or seat said inclined towards the outside, the meridian profile of carcass reinforcement having a constant direction of curvature in the second bead and the side extending radially, and also having in the second bead a tangent TT 'at the point of tangency T of said profile with the annular element of said second bead making with the axis of rotation an angle 0 open towards the outside and between 45 ° and 70 °.
  • the tire advantageously has two seats known as inclined towards the 'exterior and different diameters.
  • FIG. 1 diagrammatically represents an assembly composed of the tire according to the invention, its mounting rim and a tread support support,
  • FIG. 2 schematically but more precisely represents the mounting rim of the tire according to the invention
  • FIG. 3 shows schematically and partially a sidewall and a bead of tire, according to the invention.
  • the tire (1) comprises a tread (10) joined, by means of two sidewalls (11), to two beads (12). It is reinforced by a radial carcass reinforcement (13) formed of a single ply of textile cables anchored in each bead (12) by turning around an annular inextensible reinforcing element which is in this case, in the example describes a rod (14) of the "braided" type.
  • the carcass reinforcement (13) is radially surmounted by a crown reinforcement (15) composed on the one hand of two superimposed plies (15A) and (15B) of metallic cables crossed from one ply to the next, making an angle of 22 ° with the circumferential direction, and on the other hand, disposed radially outside said metallic reinforcement of a ply (15C) of textile cables circumferentially arranged or substantially circumferentially, that is to say in the interval + 2 °, - 2 °.
  • the rim (2), on which the tire (1) will be mounted, of axial width S ( Figure 2) measured between its axially furthest ends from the equatorial plane XX ', is mainly formed by two seats (23') and ( 23 ") frustoconical whose generatrices (230 ', 230") make with the axis of rotation an angle ⁇ ', inclined towards the outside of the tire, between 4 ° and 30 ° and in the example described equal to 14 °, less than the angle of the corresponding generatrices of the seats (12B) of the beads (12) of the tire.
  • the said seats (23 ') and (23 ") thus have axially outer ends on circles of smaller diameters than those of the circles on which the axially inner ends are located.
  • Each seat (23') and (23") is extended axially outside by a projection or hump (25 ', 25 ") whose inner face (250', 250") makes an angle ⁇ 'with the axis of rotation, whose diameter D (D SI ) is less than the inside diameter D TE (D TI ) of the bead reinforcement rod (14) intended to be mounted on said seat, and the height hj of which, measured relative to the axially outer end of the rim seat (23 ', 23 ") is a height comparable to the height of the humps or protrusions used axially inside the usual and standard touring rims.
  • the respective diameters D SE , D SI of the protrusions (25 ', 25"), D RE , D RJ of the rim seats (23 ', 23 ") and D BE , D BI of the corresponding bead seats are
  • One of the projections (25 ') has in fact a diameter D greater by an amount ⁇ S than the diameter D of the opposite projection (25 "), the diameter D SE being the diameter of the projection (25") located on the side outside of the vehicle, and ⁇ S being between 2.5% and 10% of the smallest diameter D SE .
  • the seat (23 ') On one side of the rim, precisely the side inside the vehicle, the seat (23 '), whose diameter is the largest, is connected to the axially outer wall (240) of a flange rim (24), wall making an angle ⁇ with a parallel to the axis of rotation, the diameter Dp of which is greater than the diameter of any part of the rim (2) between said flange (24) and the edge of the rim (2) axially closest to said flange (24).
  • the rim seat (23 ") On the opposite side with respect to the equatorial plane XX ′, that is to say the side outside the vehicle, the rim seat (23 ") is connected to a cylindrical portion (21), on which a support will come to rest. tread support (4).
  • This cylindrical portion (21) is provided axially inside a projection (26) for transversely positioning the support (4).
  • the height h2 of this projection at most equal to 1.5% of the diameter of the cylindrical portion (21), which is the nominal diameter D of the rim (2), is small and, in the example, equal to 5 mm.
  • the axially outer face of the positioning projection (26) and the axially inner face of the rim (24) axially define the mounting groove (22) of depth h ', said height h' being measured radially with respect to the generator cylindrical with diameter D.
  • a tread support support (4) completes the assembly formed by the tire (1) and the rim (2) (FIG. 1).
  • the support support (4) which is circumferentially ovalizable and inextensible, is preferably made of rubbery vulcanized material in annular form, said vulcanized material (40) being reinforced respectively radially inside and radially outside by two frames (41) and (42) each consisting of two layers of textile cables oriented circumferentially at plus or minus 2 °.
  • the meridian section of the support (4) has a shape similar to a rectangle whose radially inner side is straight, while the lateral sides and the radially outer side may be slightly curved.
  • the difference H 'between its internal radius and its external radius is equal to 50% of the height H of the tire (1), which gives the assembly maximum efficiency in offering the advantage of prolonging running flat, that is to say at zero inflation pressure, without causing, in the case of a usual structure of the sidewalls of the tire, lapses at the level thereof, the carcass reinforcement and even the crown reinforcement.
  • the annular support support (4) is easily threadable due to the particular characteristics of the mounting rim (2), and will serve as a stop or rim at least for the bead (12) outside of the tire mounted on the vehicle, said bead (12) being naturally the most suitable for loosening, and the outer side of the mounted tire being the most affected by the damage in the case of running at zero or low pressure and with high drift.
  • the contour of the bead (12) comprises, axially inside, a wall (12D) substantially perpendicular to the axis of rotation, wall which will bear laterally on the axially outer face of the support ring (4).
  • Said wall (12D) of the bead (12) is extended axially outside by a frustoconical generator (12C), making with a parallel to the axis of rotation an angle ⁇ of 45 ° open axially inwards and radially towards outside.
  • Said generator (12C) is itself extended axially outside by a second frustoconical generator (12B) of bead seat making with the direction of the axis of rotation an angle ⁇ equal to 15 °, open axially towards the inside and radially outwards.
  • Said generator (12B) is said to be inclined towards the outside, its axially outer end being on a circle with a diameter less than the diameter of the circle on which its axially inner end is located.
  • a frusto-conical generator (12A) extending the generator (12B) axially outside and making with the direction of the axis of rotation an angle ⁇ equal to 45 °, open axially and radially outward, completes the outline of the base of the bead (12).
  • the generator (12B) While the generator (12B) will be supported on the offset seat (23 "), inclined outwards, the generator (12A) will be supported on the axially inner wall (250") of the projection or hump (25 ") of the rim (2), inclined by the angle ⁇ ', equal to the angle ⁇ of the generator (12A).
  • the carcass reinforcement (13) is wound around the coated rod (14) going from the heel to the point of the bead (12), to form a reversal (130), substantially rectilinear and which is located inside a profile (3) disposed axially outside the anchor rod (14) of the carcass reinforcement (13).
  • This profile (3) is in the form of a substantially circular sector with a vertex or center A located radially under the rod (14), two sides or spokes (31) and (32) starting from said vertex A, and a third side (30), opposite vertex A.
  • the side or radially outer radius (31) made with a parallel to the axis of rotation an angle ⁇ equal to 45 °, while the side or radially inner radius (32) made with the same parallel an angle 02 equal to 15 °.
  • This profile (3), axially completed on the outside by the substantially circular side (30), is made of a rubbery mixture having in the vulcanized state a Shore A hardness equal to 94.
  • the coated rod (14) is surmounted radially on the outside of a profile (7) of rubber mixture with a Shore A hardness equal to 37.
  • Radially on the outside of the profile (3) and axially on the outside of said profile ( 7) is arranged a third section (6) in rubber mixture having a Shore A hardness equal to that of the section (7) and therefore significantly lower than the hardness of the mixture of the section (3), which allows, during an increase tension of the carcass reinforcement, to facilitate the axial displacement of the braided rod (14) towards the outside of the bead (12) and thus to create a compression of the profile (3) and a self-tightening of the point of bead on the mounting rim (2), whereas, in the case described, the initial tightening of the bead (12) on said rim is practically zero, due to the quasi-equality between the angles ⁇ and ⁇ ′ and between the largest diameters of the rim and bead seats.
  • the bead (12) is completed by the protector (5).
  • the meridian profile of the carcass reinforcement (13), when the tire is mounted on its service rim (2) and inflated to its service pressure, has a constant direction of curvature over its entire length, and is such that the tangents TT 'at the tangent points T of said profile with the coated rods (14) of the beads (12) make with the axis of rotation angles ⁇ open axially and radially outward and equal to 50 °.
  • the inclination of said tangents not only allows better tightening on the rim of the beads thus formed, better resistance to loosening and good resistance to the unwinding of the carcass reinforcement, but also better passenger comfort whatsoever. at the level of the vertical accelerations felt only bothersome frequencies such as the hum of the body.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

The invention concerns a tyre (1) comprising at least a first bead (12), whereof the seat (12B) is inclined outwards, and a radial body ply reinforcement (13), viewed in meridian cross-section, wound in each bead (12) around at least an annular reinforcing element (14), from inside outwards to form a ply turn-up (130) extending in a profile (3) of rubber mix (30) in the form of a wedge delimited by two sides (31, 32) derived from a crown A located under the annular element (14) section, the rubber mix forming the profile (3), axially adjacent to the annular element (14), having a high Shore A hardness. The invention is characterised in that the meridian profile of the body ply reinforcement (13), when the tyre is mounted on its rim for use (2) and inflated to its pressure for use, has a constant curvature direction in the sidewalls and first bead and whereof the tangent TT' at the point of tangency T of said profile with the annular element (14) of said bead (12) forms with the axis of rotation an angle ø open outwards ranging between 45° and 70°.

Description

PNEUMATIQUE AVEC DES BOURRELETS TIRE WITH SADDLES
DE STRUCTURE AMELIOREEIMPROVED STRUCTURE
La présente invention concerne un pneumatique destiné à être monté sur une jante ayant au moins un premier siège tronconique dont la génératrice a une extrémité axialement extérieure plus proche de l'axe de rotation que l'extrémité axialement intérieure.The present invention relates to a tire intended to be mounted on a rim having at least one first frustoconical seat, the generator of which has an axially outer end closer to the axis of rotation than the axially inner end.
Un tel pneumatique est décrit dans la demande WO 4/13498 de la demanderesse. Il comprend au moins un premier bourrelet, destiné à être monté sur ledit premier siège déjante incliné vers l'extérieur, ledit premier bourrelet, de largeur axiale usuelle et terminé axialement à l'extérieur par une pointe de bourrelet, ayant un siège de bourrelet dont la génératrice a son extrémité axialement extérieure plus proche de l'axe de rotation que son extrémité axialement intérieure, ladite génératrice étant prolongée axialement à l'extérieur par une face extérieure délimitant la pointe de bourrelet, ladite face faisant avec l'axe de rotation un angle γ , ouvert radialement et axialement vers l'extérieur, et inférieur à 90°. L'armature de carcasse radiale dudit pneumatique, ancrée dans chaque bourrelet à au moins un élément de renforcement annulaire inextensible, possède un profil méridien, lorsque le pneumatique est monté sur sa jante de service et gonflé à sa pression de service, avec un sens de courbure constant dans les flancs et bourrelet terminés par la pointe et qui est tel que, dans ledit bourrelet, la tangente au point de tangence dudit profil avec l'élément annulaire inextensible dudit bourrelet fait avec l'axe de rotation un angle 0 ouvert vers l'extérieur d'au moins 70°.Such a tire is described in application WO 4/13498 from the applicant. It comprises at least a first bead, intended to be mounted on said first outboard seat inclined towards the outside, said first bead, of usual axial width and terminated axially on the outside by a bead point, having a bead seat of which the generator has its axially outer end closer to the axis of rotation than its axially inner end, said generator being extended axially outside by an outer face delimiting the bead tip, said face forming with the axis of rotation a angle γ, open radially and axially outwards, and less than 90 °. The radial carcass reinforcement of said tire, anchored in each bead to at least one inextensible annular reinforcement element, has a meridian profile, when the tire is mounted on its service rim and inflated to its service pressure, with a sense of constant curvature in the sides and bead terminated by the point and which is such that, in said bead, the tangent to the point of tangency of said profile with the inextensible annular element of said bead made with the axis of rotation an angle 0 open towards the at least 70 ° outside.
Le bourrelet d'un tel pneumatique, et plus particulièrement la structure de l'accrochage de l'armature de carcasse peut être variable. Dans la demande internationale précitée, l'armature de carcasse est ancrée à un élément de renforcement annulaire inextensible (généralement une tringle enrobée) de manière usuelle, c'est-à- dire par enroulement de ladite armature autour dudit élément pour former un retournement partant de la base de l'élément et s'élevant radialement vers l'extérieur.The bead of such a tire, and more particularly the structure of the attachment of the carcass reinforcement can be variable. In the aforementioned international application, the carcass reinforcement is anchored to an inextensible annular reinforcement element (generally a coated rod) in the usual way, that is to say say by winding said frame around said element to form a reversal starting from the base of the element and rising radially outwards.
Dans la demande internationale WO 95/23073, l'armature de carcasse radiale est ancrée à l'élément inextensible par enroulement autour dudit élément en allant du talon à la pointe du bourrelet pour former un retournement s'étendant dans un profilé de mélange caoutchouteux sous forme de coin délimité par deux côtés issus d'un sommet A localisé sous la section de la tringle enrobée, le côté radialement externe faisant, avec une parallèle avec l'axe de rotation passant par ledit sommet A, un angle 0\ aigu, ouvert radialement vers l'extérieur et compris entre 20° et 70°, et le côté radialement interne faisant avec ladite parallèle un angle 02 aigu, ouvert radialement vers l'intérieur et compris entre 0° et 30°, et le mélange caoutchouteux formant le profilé, axialement adjacent à la tringle, ayant une dureté Shore A au moins égale à 65 et supérieure à la (aux) dureté(s) Shore A des mélanges caoutchouteux axialement et radialement au dessus de la tringle et du profilé.In international application WO 95/23073, the radial carcass reinforcement is anchored to the inextensible element by winding around said element going from the heel to the point of the bead to form a reversal extending in a profile of rubber mixture under wedge shape delimited by two sides from a vertex A located under the section of the coated rod, the radially outer side forming, with a parallel with the axis of rotation passing through said vertex A, an acute angle 0 \, open radially outward and between 20 ° and 70 °, and the radially inner side forming with said parallel an acute angle 02, open radially inward and between 0 ° and 30 °, and the rubber mixture forming the profile , axially adjacent to the rod, having a Shore A hardness at least equal to 65 and greater than the Shore A hardness (s) of the rubber mixes axially and radially above the rod and the profile.
Les structures de bourrelet décrites ci-dessus permettent une modification (accroissement) du serrage de la pointe de bourrelet sur la jante de montage en fonction de la tension de l'armature de carcasse, ce qui conduit à avoir un serrage sur jante initial de faible valeur sachant que ledit serrage augmentera lorsque le pneumatique sera gonflé à sa pression recommandée. Les dites solutions présentent, lorsque les conditions de roulage du pneumatique sont telles que les bourrelets sont portés à haute température, et en fin de durée de vie, des faiblesses en endurance provenant d'un certain déroulement de l'armature de carcasse autour de l'élément annulaire de renforcement du talon de bourrelet.The bead structures described above allow a modification (increase) of the tightening of the bead tip on the mounting rim as a function of the tension of the carcass reinforcement, which leads to having an initial tightening of the rim of low value knowing that said tightening will increase when the tire is inflated to its recommended pressure. Said solutions have, when the rolling conditions of the tire are such that the beads are brought to high temperature, and at the end of their lifespan, weaknesses in endurance originating from a certain unwinding of the carcass reinforcement around the annular reinforcement element of the bead heel.
L'invention a pour but de remédier aux dits inconvénients ci-dessus tout en conservant les excellentes propriétés d'anti-décoincement du pneumatique considéré. Le pneumatique, conforme à l'invention et vu en section méridienne, comprend au moins un premier bourrelet, dont le siège a une génératrice dont l'extrémité axialement intérieure est sur un cercle de diamètre supérieur au diamètre du cercle sur lequel se trouve l'extrémité axialement extérieure, le talon de bourrelet étant axialement à l'intérieur, alors que la pointe de bourrelet est axialement à l'extérieur, et une armature de carcasse radiale s'enroulant dans chaque bourrelet autour d'au moins un élément de renforcement de talon, annulaire, inextensible et enrobé de mélange caoutchouteux , en allant de l'intérieur à l'extérieur pour former un retournement, s'étendant dans un profilé de mélange caoutchouteux sous forme de coin délimité par deux côtés issus d'un sommet A localisé sous la section de l'élément annulaire, le côté radialement externe faisant, avec une parallèle avec l'axe de rotation passant par ledit sommet A, un angle &\ aigu, ouvert radialement vers l'extérieur, et le côté radialement interne faisant avec ladite parallèle un angle 02 aigu, ouvert radialement vers l'intérieur, le mélange caoutchouteux formant le profilé, axialement adjacent à l'élément annulaire, ayant une dureté Shore A supérieure à la (aux) dureté(s) Shore A des mélanges caoutchouteux respectivement radialement au dessus du dit élément et du profilé axialement adjacent, caractérisé en ce que le profil méridien d'armature de carcasse, lorsque le pneumatique est monté sur sa jante de service et gonflé à la pression recommandée, a un sens de courbure constant dans le premier bourrelet et le flanc le prolongeant radialement, et a une a tangente TT' au point de tangence T dudit profil avec l'élément annulaire dudit premier bourrelet faisant avec l'axe de rotation un angle 0 ouvert vers l'extérieur et compris entre 45° et 70°.The object of the invention is to remedy the above-mentioned drawbacks while retaining the excellent anti-loosening properties of the tire in question. The tire, in accordance with the invention and seen in meridian section, comprises at least one first bead, the seat of which has a generator whose axially inner end is on a circle with a diameter greater than the diameter of the circle on which the axially outer end, the bead heel being axially on the inside, while the bead tip is axially on the outside, and a radial carcass reinforcement winding in each bead around at least one reinforcing element of heel, annular, inextensible and coated with rubbery mixture, going from the inside to the outside to form a reversal, extending in a profile of rubbery mixture in the form of a corner delimited by two sides coming from a localized vertex A under the section of the annular element, the radially external side forming, with a parallel with the axis of rotation passing through the said vertex A, an acute angle, open rt radially outwards, and the radially internal side forming with said parallel an acute angle O 2, open radially inwards, the rubber mixture forming the profile, axially adjacent to the annular element, having a Shore A hardness greater than Shore A hardness (ies) of rubber mixes respectively radially above said element and axially adjacent profile, characterized in that the meridian profile of the carcass reinforcement, when the tire is mounted on its service rim and inflated to the recommended pressure, has a constant direction of curvature in the first bead and the side extending radially, and has a tangent TT 'at the point of tangency T of said profile with the annular element of said first bead making with the axis of rotation an angle 0 open to the outside and between 45 ° and 70 °.
De manière préférentielle, le pneumatique comprend un deuxième bourrelet dont le siège présente la même configuration que le siège du premier bourrelet, c'est-à-dire un siège dont la génératrice possède une extrémité axialement intérieure sur un cercle de diamètre supérieur au diamètre du cercle sur lequel se trouve l'extrémité axialement extérieure, ou siège dit incliné vers l'extérieur, le profil méridien d'armature de carcasse ayant un sens de courbure constant dans le deuxième bourrelet et le flanc le prolongeant radialement, et ayant aussi dans le deuxième bourrelet une tangente TT' au point de tangence T dudit profil avec l'élément annulaire dudit deuxième bourrelet faisant avec l'axe de rotation un angle 0 ouvert vers l'extérieur et compris entre 45° et 70°.Preferably, the tire comprises a second bead whose seat has the same configuration as the seat of the first bead, that is to say a seat whose generator has an axially inner end on a circle of diameter greater than the diameter of the circle on which the axially outer end is located, or seat said inclined towards the outside, the meridian profile of carcass reinforcement having a constant direction of curvature in the second bead and the side extending radially, and also having in the second bead a tangent TT 'at the point of tangency T of said profile with the annular element of said second bead making with the axis of rotation an angle 0 open towards the outside and between 45 ° and 70 °.
De même, si l'on appelle diamètre d'un siège incliné le diamètre du cercle sur lequel se trouve l'extrémité de sa génératrice la plus éloignée de l'axe de rotation, le pneumatique a de façon avantageuse deux sièges dits inclinés vers l'extérieur et de diamètres différents.Similarly, if the diameter of an inclined seat is called the diameter of the circle on which the end of its generatrix is located farthest from the axis of rotation, the tire advantageously has two seats known as inclined towards the 'exterior and different diameters.
L'invention sera mieux comprise à l'aide du dessin annexé à la description, illustrant un exemple non limitatif d'exécution d'un pneumatique conforme à l'invention, et qui, associé à une jante adaptée, forme un ensemble pneumatique-jante performant. Sur ledit dessin,The invention will be better understood using the drawing appended to the description, illustrating a nonlimiting example of execution of a tire according to the invention, and which, associated with a suitable rim, forms a tire-rim assembly. efficient. In said drawing,
- la figure 1 représente schématiquement un ensemble composé du pneumatique conforme à l'invention , de sa jante de montage et d'un appui de soutien de bande de roulement,FIG. 1 diagrammatically represents an assembly composed of the tire according to the invention, its mounting rim and a tread support support,
- la figure 2 représente schématiquement mais de manière plus précise la jante de montage du pneumatique conforme à l'invention,FIG. 2 schematically but more precisely represents the mounting rim of the tire according to the invention,
- la figure 3 représente schématiquement et partiellement un flanc et un bourrelet de pneumatique, conforme à l'invention.- Figure 3 shows schematically and partially a sidewall and a bead of tire, according to the invention.
Sur la figure 1, le pneumatique (1) comprend une bande de roulement (10) réunie, au moyen de deux flancs (11), à deux bourrelets (12). Il est renforcé par une armature de carcasse radiale (13) formée d'une seule nappe de câbles textiles ancrée dans chaque bourrelet (12) par retournement autour d'un élément annulaire de renforcement inextensible qui est en l'occurrence, dans l'exemple décrit, une tringle (14) de type "tressée". L'armature de carcasse (13) est surmontée radialement d'une armature de sommet (15) composée d'une part de deux nappes superposées (15A) et (15B) de câbles métalliques croisés d'une nappe à la suivante en faisant avec la direction circonférentielle un angle de 22°, et d'autre part, disposée radialement à l'extérieur de ladite armature métallique d'une nappe (15C) de câbles textiles disposés circonférentiellement ou sensiblement circonférentiellement, c'est-à-dire dans l'intervalle + 2°, - 2°.In FIG. 1, the tire (1) comprises a tread (10) joined, by means of two sidewalls (11), to two beads (12). It is reinforced by a radial carcass reinforcement (13) formed of a single ply of textile cables anchored in each bead (12) by turning around an annular inextensible reinforcing element which is in this case, in the example describes a rod (14) of the "braided" type. The carcass reinforcement (13) is radially surmounted by a crown reinforcement (15) composed on the one hand of two superimposed plies (15A) and (15B) of metallic cables crossed from one ply to the next, making an angle of 22 ° with the circumferential direction, and on the other hand, disposed radially outside said metallic reinforcement of a ply (15C) of textile cables circumferentially arranged or substantially circumferentially, that is to say in the interval + 2 °, - 2 °.
La jante (2), sur laquelle sera monté le pneumatique (1), de largeur axiale S (figure 2) mesurée entre ses extrémités axialement les plus éloignées du plan équatorial XX', est formée principalement de deux sièges (23') et (23") tronconiques dont les génératrices (230', 230") font avec l'axe de rotation un angle α', incliné vers l'extérieur du pneumatique, compris entre 4° et 30° et dans l'exemple décrit égal à 14°, inférieur à l'angle des génératrices correspondantes des sièges (12B) des bourrelets (12) du pneumatique. Les dits sièges (23') et (23") ont ainsi des extrémités axialement extérieures sur des cercles de plus petits diamètres que ceux des cercles sur lesquels se trouvent les extrémités axialement intérieures. Chaque siège (23') et (23") est prolongé axialement à l'extérieur par une saillie ou hump (25', 25") dont la face intérieure (250', 250") fait avec l'axe de rotation un angle γ', dont le diamètre D (DSI) est inférieur au diamètre intérieur DTE(DTI) de la tringle (14) de renforcement du bourrelet destiné à être monté sur ledit siège ,et dont la hauteur hj, mesurée par rapport à l'extrémité axialement extérieure du siège déjante (23', 23") est une hauteur comparable à la hauteur des humps ou saillies utilisés axialement à l'intérieur des jantes de tourisme usuelles et normalisées. Les diamètres respectifs DSE, DSI des saillies (25', 25"), DRE, DRJ des sièges déjante (23', 23") et DBE, DBI des sièges de bourrelets correspondants sont inégaux. Une des saillies (25') possède en effet un diamètre D supérieur d'une quantité ΔS au diamètre D de la saillie opposée (25"), le diamètre DSE étant le diamètre de la saillie (25") située du côté extérieur du véhicule, et ΔS étant comprise entre 2,5% et 10% du diamètre DSE le plus petit. Sur l'un des côtés de la jante, précisément le côté situé à l'intérieur du véhicule, le siège (23'), dont le diamètre est le plus grand, est relié à la paroi axialement extérieure (240) d'un rebord déjante (24), paroi faisant avec une parallèle à l'axe de rotation un angle θ, et dont le diamètre Dp est supérieur au diamètre de toute partie de la jante (2) comprise entre ledit rebord (24) et le bord de la jante (2) axialement le plus proche dudit rebord (24). Du côté opposé par rapport au plan équatorial XX', c'est-à- dire le côté à l'extérieur du véhicule, le siège déjante (23") est relié à une portion cylindrique (21), sur laquelle viendra reposer un appui de soutien (4) de bande de roulement. Cette portion cylindrique (21) est munie axialement à l'intérieur d'une saillie (26) de positionnement transversal de l'appui (4). La hauteur h2 de cette saillie, au plus égale à 1,5 % du diamètre de la portion cylindrique (21), qui est le diamètre nominal D de la jante (2), est faible et, dans l'exemple, égale à 5 mm.The rim (2), on which the tire (1) will be mounted, of axial width S (Figure 2) measured between its axially furthest ends from the equatorial plane XX ', is mainly formed by two seats (23') and ( 23 ") frustoconical whose generatrices (230 ', 230") make with the axis of rotation an angle α', inclined towards the outside of the tire, between 4 ° and 30 ° and in the example described equal to 14 °, less than the angle of the corresponding generatrices of the seats (12B) of the beads (12) of the tire. The said seats (23 ') and (23 ") thus have axially outer ends on circles of smaller diameters than those of the circles on which the axially inner ends are located. Each seat (23') and (23") is extended axially outside by a projection or hump (25 ', 25 ") whose inner face (250', 250") makes an angle γ 'with the axis of rotation, whose diameter D (D SI ) is less than the inside diameter D TE (D TI ) of the bead reinforcement rod (14) intended to be mounted on said seat, and the height hj of which, measured relative to the axially outer end of the rim seat (23 ', 23 ") is a height comparable to the height of the humps or protrusions used axially inside the usual and standard touring rims. The respective diameters D SE , D SI of the protrusions (25 ', 25"), D RE , D RJ of the rim seats (23 ', 23 ") and D BE , D BI of the corresponding bead seats are One of the projections (25 ') has in fact a diameter D greater by an amount ΔS than the diameter D of the opposite projection (25 "), the diameter D SE being the diameter of the projection (25") located on the side outside of the vehicle, and ΔS being between 2.5% and 10% of the smallest diameter D SE . On one side of the rim, precisely the side inside the vehicle, the seat (23 '), whose diameter is the largest, is connected to the axially outer wall (240) of a flange rim (24), wall making an angle θ with a parallel to the axis of rotation, the diameter Dp of which is greater than the diameter of any part of the rim (2) between said flange (24) and the edge of the rim (2) axially closest to said flange (24). On the opposite side with respect to the equatorial plane XX ′, that is to say the side outside the vehicle, the rim seat (23 ") is connected to a cylindrical portion (21), on which a support will come to rest. tread support (4). This cylindrical portion (21) is provided axially inside a projection (26) for transversely positioning the support (4). The height h2 of this projection, at most equal to 1.5% of the diameter of the cylindrical portion (21), which is the nominal diameter D of the rim (2), is small and, in the example, equal to 5 mm.
La face axialement extérieure de la saillie de positionnement (26) et la face axialement intérieure du rebord déjante (24), définissent axialement la gorge de montage (22) de profondeur h', ladite hauteur h' étant mesurée radialement par rapport à la génératrice cylindrique de diamètre D.The axially outer face of the positioning projection (26) and the axially inner face of the rim (24) axially define the mounting groove (22) of depth h ', said height h' being measured radially with respect to the generator cylindrical with diameter D.
Un appui de soutien (4) de bande de roulement (10) complète l'ensemble formé par le pneumatique (1) et la jante (2) (figure 1). L'appui de soutien (4), ovalisable et inextensible circonférentiellement, est préférentiellement constitué de vulcanisât caoutchouteux sous forme annulaire, ledit vulcanisât (40) étant renforcé respectivement radialement à l'intérieur et radialement à l'extérieur par deux armatures (41) et (42) constituées chacune de deux couches de câbles textiles orientés circonférentiellement à plus ou moins 2°. La section méridienne de l'appui (4) a une forme voisine d'un rectangle dont le côté radialement intérieur est rectiligne, alors que les côtés latéraux et le côté radialement extérieur peuvent être légèrement courbes. La différence H' entre son rayon intérieur et son rayon extérieur est égale à 50% de la hauteur H du pneumatique (1), ce qui confère à l'ensemble une efficacité maximale en offrant l'avantage de prolonger le roulage à plat, c'est-à-dire à pression de gonflage nulle, sans provoquer, dans le cas d'une structure usuelle des flancs du pneumatique, des déchéances au niveau de ceux-ci, de l'armature de carcasse et même de l'armature de sommet.A tread support support (4) (10) completes the assembly formed by the tire (1) and the rim (2) (FIG. 1). The support support (4), which is circumferentially ovalizable and inextensible, is preferably made of rubbery vulcanized material in annular form, said vulcanized material (40) being reinforced respectively radially inside and radially outside by two frames (41) and (42) each consisting of two layers of textile cables oriented circumferentially at plus or minus 2 °. The meridian section of the support (4) has a shape similar to a rectangle whose radially inner side is straight, while the lateral sides and the radially outer side may be slightly curved. The difference H 'between its internal radius and its external radius is equal to 50% of the height H of the tire (1), which gives the assembly maximum efficiency in offering the advantage of prolonging running flat, that is to say at zero inflation pressure, without causing, in the case of a usual structure of the sidewalls of the tire, lapses at the level thereof, the carcass reinforcement and even the crown reinforcement.
L'appui de soutien annulaire (4) est aisément enfilable du fait des caractéristiques particulières de la jante de montage (2), et servira de butée ou de rebord au moins pour le bourrelet (12) extérieur du pneumatique monté sur véhicule, ledit bourrelet (12) étant naturellement le plus apte à décoincer, et le côté extérieur du pneumatique monté étant le plus affecté par les dégradations dans le cas de roulage à pression nulle ou faible et à forte dérive.The annular support support (4) is easily threadable due to the particular characteristics of the mounting rim (2), and will serve as a stop or rim at least for the bead (12) outside of the tire mounted on the vehicle, said bead (12) being naturally the most suitable for loosening, and the outer side of the mounted tire being the most affected by the damage in the case of running at zero or low pressure and with high drift.
Le contour du bourrelet (12) comprend, axialement à l'intérieur, une paroi (12D) sensiblement perpendiculaire à l'axe de rotation, paroi qui prendra appui latéralement sur la face axialement extérieure de l'anneau de soutien (4). Ladite paroi (12D) du bourrelet (12) est prolongée axialement à l'extérieur par une génératrice tronconique (12C), faisant avec une parallèle à l'axe de rotation un angle β de 45° ouvert axialement vers l'intérieur et radialement vers l'extérieur. Ladite génératrice (12C) est elle-même prolongée axialement à l'extérieur par une seconde génératrice tronconique (12B) de siège de bourrelet faisant avec la direction de l'axe de rotation un angle α égal à 15°, ouvert axialement vers l'intérieur et radialement vers l'extérieur. Ladite génératrice (12B) est dite inclinée vers l'extérieur, son extrémité axialement extérieure étant sur un cercle de diamètre inférieur au diamètre du cercle sur lequel se trouve son extrémité axialement intérieure. Une génératrice tronconique (12A), prolongeant axialement à l'extérieur la génératrice (12B) et faisant avec la direction de l'axe de rotation un angle γ égal à 45°, ouvert axialement et radialement vers l'extérieur, complète le contour de la base du bourrelet (12). La paroi (12E), courbe dans l'exemple décrit et d'orientation générale sensiblement perpendiculaire à la direction de l'axe de rotation de la jante, complète le contour du bourrelet (12). Alors que la génératrice (12B) prendra appui sur le siège déjante (23"), incliné vers l'extérieur, la génératrice (12A) prendra appui sur la paroi axialement intérieure (250") de la saillie ou hump (25") de la jante (2), inclinée de l'angle γ', égal à l'angle γ de la génératrice (12A). La portion de bourrelet, adjacente à la paroi (12D) et à la génératrice (12C), constitue, vue en section méridienne, le talon du bourrelet (12). La portion de bourrelet, adjacente à la génératrice (12B), à la génératrice (12A) et partiellement à la paroi (12E), constitue la pointe du bourrelet (12). L'armature de carcasse (13) est enroulée autour de la tringle enrobée (14) en allant du talon à la pointe du bourrelet (12), pour former un retournement (130), sensiblement rectiligne et qui se situe à l'intérieur d'un profilé (3), disposé axialement à l'extérieur de la tringle d'ancrage (14) de l'armature de carcasse (13). Ce profilé (3) se présente sous la forme d'un secteur sensiblement circulaire avec un sommet ou centre A situé radialement sous la tringle (14), deux côtés ou rayons (31) et (32) partant dudit sommet A, et un troisième côté (30), opposé au sommet A. Le côté ou rayon radialement extérieur (31) fait avec une parallèle à l'axe de rotation un angle \ égal à 45°, alors que le côté ou rayon radialement intérieur (32) fait avec la même parallèle un angle 02 égal à 15°. Ce profilé (3), complété axialement à l'extérieur par le côté sensiblement circulaire (30), est fait d'un mélange caoutchouteux ayant dans l'état vulcanisé une dureté Shore A égale à 94.The contour of the bead (12) comprises, axially inside, a wall (12D) substantially perpendicular to the axis of rotation, wall which will bear laterally on the axially outer face of the support ring (4). Said wall (12D) of the bead (12) is extended axially outside by a frustoconical generator (12C), making with a parallel to the axis of rotation an angle β of 45 ° open axially inwards and radially towards outside. Said generator (12C) is itself extended axially outside by a second frustoconical generator (12B) of bead seat making with the direction of the axis of rotation an angle α equal to 15 °, open axially towards the inside and radially outwards. Said generator (12B) is said to be inclined towards the outside, its axially outer end being on a circle with a diameter less than the diameter of the circle on which its axially inner end is located. A frusto-conical generator (12A), extending the generator (12B) axially outside and making with the direction of the axis of rotation an angle γ equal to 45 °, open axially and radially outward, completes the outline of the base of the bead (12). The wall (12E), curved in the example described and of general orientation substantially perpendicular to the direction of the axis of rotation of the rim, completes the outline of the bead (12). While the generator (12B) will be supported on the offset seat (23 "), inclined outwards, the generator (12A) will be supported on the axially inner wall (250") of the projection or hump (25 ") of the rim (2), inclined by the angle γ ', equal to the angle γ of the generator (12A). The bead portion, adjacent to the wall (12D) and to the generator (12C), constitutes, seen in the meridian section, the heel of the bead (12) The portion of bead, adjacent to the generator (12B), to the generator (12A) and partially to the wall (12E), constitutes the point of the bead (12). the carcass reinforcement (13) is wound around the coated rod (14) going from the heel to the point of the bead (12), to form a reversal (130), substantially rectilinear and which is located inside a profile (3) disposed axially outside the anchor rod (14) of the carcass reinforcement (13). This profile (3) is in the form of a substantially circular sector with a vertex or center A located radially under the rod (14), two sides or spokes (31) and (32) starting from said vertex A, and a third side (30), opposite vertex A. The side or radially outer radius (31) made with a parallel to the axis of rotation an angle \ equal to 45 °, while the side or radially inner radius (32) made with the same parallel an angle 02 equal to 15 °. This profile (3), axially completed on the outside by the substantially circular side (30), is made of a rubbery mixture having in the vulcanized state a Shore A hardness equal to 94.
La tringle (14) enrobée est surmontée radialement à l'extérieur d'un profilé (7) de mélange caoutchouteux de dureté Shore A égale à 37. Radialement à l'extérieur du profilé (3) et axialement à l'extérieur dudit profilé (7) est disposé un troisième profilé (6) en mélange caoutchouteux ayant une dureté Shore A égale à celle du profilé (7) et donc nettement inférieure à la dureté du mélange du profilé (3), ce qui permet, lors d'un accroissement de tension de l'armature de carcasse, de faciliter le déplacement axial de la tringle tressée (14) vers l'extérieur du bourrelet (12) et ainsi de créer une compression du profilé (3) et un auto-serrage de la pointe de bourrelet sur la jante (2) de montage, alors que, dans le cas décrit, le serrage initial du bourrelet (12) sur ladite jante est pratiquement nul, du fait de la quasi-égalité entre les angles α et α' et entre les plus grands diamètres des sièges déjante et de bourrelets. Le bourrelet (12) est complété par le protecteur (5).The coated rod (14) is surmounted radially on the outside of a profile (7) of rubber mixture with a Shore A hardness equal to 37. Radially on the outside of the profile (3) and axially on the outside of said profile ( 7) is arranged a third section (6) in rubber mixture having a Shore A hardness equal to that of the section (7) and therefore significantly lower than the hardness of the mixture of the section (3), which allows, during an increase tension of the carcass reinforcement, to facilitate the axial displacement of the braided rod (14) towards the outside of the bead (12) and thus to create a compression of the profile (3) and a self-tightening of the point of bead on the mounting rim (2), whereas, in the case described, the initial tightening of the bead (12) on said rim is practically zero, due to the quasi-equality between the angles α and α ′ and between the largest diameters of the rim and bead seats. The bead (12) is completed by the protector (5).
Le profil méridien de l'armature de carcasse (13), lorsque le pneumatique est monté sur sa jante de service (2) et gonflé à sa pression de service, a un sens de courbure constant sur toute sa longueur, et est tel que les tangentes TT' aux points de tangence T dudit profil avec les tringles enrobées (14) des bourrelets (12) font avec l'axe de rotation des angles φ ouverts axialement et radialement vers l'extérieur et égaux à 50°. L'inclinaison des dites tangentes, non seulement permet un meilleur serrage sur jante des bourrelets ainsi constitués, une meilleure résistance au décoincement et une bonne tenue vis à vis du déroulement d'armature de carcasse, mais aussi un meilleur confort des passagers que ce soit au niveau des accélérations verticales ressenties que des fréquences gênantes tel que le bourdonnement de caisse. The meridian profile of the carcass reinforcement (13), when the tire is mounted on its service rim (2) and inflated to its service pressure, has a constant direction of curvature over its entire length, and is such that the tangents TT 'at the tangent points T of said profile with the coated rods (14) of the beads (12) make with the axis of rotation angles φ open axially and radially outward and equal to 50 °. The inclination of said tangents not only allows better tightening on the rim of the beads thus formed, better resistance to loosening and good resistance to the unwinding of the carcass reinforcement, but also better passenger comfort whatsoever. at the level of the vertical accelerations felt only bothersome frequencies such as the hum of the body.

Claims

REVENDICATIONS.CLAIMS.
1 - Pneumatique (1) comprenant au moins un premier bourrelet (12), dont le siège (12B) a une génératrice dont l'extrémité axialement intérieure est sur un cercle de diamètre supérieur au diamètre du cercle sur lequel se trouve l'extrémité axialement extérieure, le talon de bourrelet (12) étant axialement à l'intérieur alors que la pointe dudit bourrelet est axialement à l'extérieur, et une armature de carcasse radiale (13), vue en section méridienne, s'enroulant dans chaque bourrelet (12) autour d'au moins un élément de renforcement annulaire (14), inextensible et enrobé de mélange caoutchouteux, en allant de l'intérieur à l'extérieur pour former un retournement (130), s'étendant dans un profilé (3) de mélange caoutchouteux (30) sous forme de coin délimité par deux côtés (31, 32) issus d'un sommet A localisé sous la section de l'élément annulaire (14), le côté radialement externe (31) faisant, avec une parallèle avec l'axe de rotation passant par ledit sommet A, un angle 0\ aigu, ouvert radialement vers l'extérieur, et le côté radialement interne (32) faisant avec ladite parallèle un angle 02 aigu, ouvert radialement vers l'intérieur, le mélange caoutchouteux formant le profilé (3), axialement adjacent à l'élément annulaire (14), ayant une dureté Shore A supérieure à la (aux) dureté(s) Shore A du mélange caoutchouteux (7) axialement et radialement au dessus du dit élément (14) et du profilé (6) axialement adjacent, caractérisé en ce que le profil méridien de l'armature de carcasse (13), lorsque le pneumatique est monté sur sa jante de service (2) et gonflé à sa pression de service, a un sens de courbure constant dans le premier bourrelet et le flanc le prolongeant radialement, et a une tangente TT' au point de tangence T dudit profil avec l'élément annulaire (14) dudit bourrelet (12) faisant avec l'axe de rotation un angle 0 ouvert vers l'extérieur compris entre 45° et 70°.1 - Tire (1) comprising at least a first bead (12), the seat (12B) of which has a generatrix whose axially inner end is on a circle with a diameter greater than the diameter of the circle on which the end is located axially outer, the bead heel (12) being axially inside while the tip of said bead is axially outside, and a radial carcass reinforcement (13), seen in meridian section, winding in each bead ( 12) around at least one annular reinforcing element (14), inextensible and coated with a rubber mixture, going from the inside to the outside to form a reversal (130), extending in a profile (3) of rubber mixture (30) in the form of a corner delimited by two sides (31, 32) coming from a vertex A located under the section of the annular element (14), the radially external side (31) forming, with a parallel with the axis of rotation passing through l edit vertex A, an acute angle 0 \, open radially outwards, and the radially internal side (32) making with said parallel an acute angle 02, open radially inward, the rubber mixture forming the profile (3) , axially adjacent to the annular element (14), having a Shore A hardness greater than the Shore A hardness (s) of the rubber mixture (7) axially and radially above said element (14) and the profile ( 6) axially adjacent, characterized in that the meridian profile of the carcass reinforcement (13), when the tire is mounted on its service rim (2) and inflated to its service pressure, has a constant direction of curvature in the first bead and the flank extending it radially, and has a tangent TT 'at the point of tangency T of said profile with the annular element (14) of said bead (12) making with the axis of rotation an angle 0 open towards the outside between 45 ° and 70 °.
2 - Pneumatique (1) selon la revendication 1, caractérisé en ce qu'il comprend un deuxième bourrelet (12) dont le siège (12B) présente la même configuration que le siège (12B) du premier bourrelet (12), c'est-à-dire un siège dont la génératrice possède une extrémité axialement intérieure sur un cercle de diamètre supérieur au diamètre du cercle sur lequel se trouve l'extrémité axialement extérieure, ou siège dit incliné vers l'extérieur, le profil méridien d'armature de carcasse (13) ayant un sens de courbure constant dans le deuxième bourrelet (12) et le flanc le prolongeant radialement, et ayant aussi dans le deuxième bourrelet (12) une tangente TT' au point de tangence T dudit profil avec l'élément annulaire (14) dudit deuxième bourrelet (12) faisant avec l'axe de rotation un angle φ ouvert vers l'extérieur et compris entre 45° et 70°.2 - A tire (1) according to claim 1, characterized in that it comprises a second bead (12) whose seat (12B) has the same configuration as the seat (12B) of the first bead (12), that is i.e. a seat whose generator has an axially inner end on a circle of diameter greater than the diameter of the circle on which the axially outer end is located, or seat said inclined towards the outside, the meridian profile of carcass reinforcement (13) having a constant direction of curvature in the second bead (12) and the side extending radially, and also having in the second bead (12) a tangent TT 'at the point of tangency T of said profile with the annular element (14) of said second bead (12) making with the axis of rotation an angle φ open to the outside and between 45 ° and 70 °.
3 - Pneumatique selon la revendication 2, caractérisé en ce qu'il a deux sièges (12) dits inclinés vers l'extérieur et de diamètres différents. 3 - A tire according to claim 2, characterized in that it has two seats (12) said inclined outwards and of different diameters.
PCT/EP1999/010471 1999-01-13 1999-12-30 Tyre with beads having improved structure WO2000041467A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU24345/00A AU2434500A (en) 1999-01-13 1999-12-30 Tyre with beads having improved structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9900308A FR2788239B1 (en) 1999-01-13 1999-01-13 TIRE WITH IMPROVED STRUCTURE BUCKLES
FR99/00308 1999-01-13

Publications (2)

Publication Number Publication Date
WO2000041467A2 true WO2000041467A2 (en) 2000-07-20
WO2000041467A3 WO2000041467A3 (en) 2002-09-26

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AU (1) AU2434500A (en)
FR (1) FR2788239B1 (en)
WO (1) WO2000041467A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001089861A1 (en) * 2000-05-22 2001-11-29 Societe De Technologie Michelin Tyre comprising a reinforcing profiled section in at least one sidewall, and mounted tyre/rim assembly
FR2809348A1 (en) * 2000-05-26 2001-11-30 Michelin Soc Tech Tire has bead with axially inner end on larger diameter circle than axially outer end and crescent shaped reinforced profile with surface matching shape of radial carcass reinforcement
EP1674294A1 (en) * 2004-12-22 2006-06-28 The Goodyear Tire & Rubber Company Pneumatic run-flat tire
WO2019234370A1 (en) * 2018-06-08 2019-12-12 Compagnie Generale Des Etablissements Michelin Flexible adapter and rim assembly for a rolling assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1086571B (en) * 1956-12-14 1960-08-04 Firestone Tire & Rubber Co Motor vehicle wheel consisting of a rim and a tubeless tire
GB2061199A (en) * 1979-10-20 1981-05-13 Dunlop Ltd Tyre and wheel assemblies
WO1994013498A1 (en) * 1992-12-11 1994-06-23 Compagnie Generale Des Etablissements Michelin - Michelin & Cie Tyre, rim, supporting ring and assembly comprising same
WO1995023073A1 (en) * 1994-02-28 1995-08-31 Compagnie Générale des Etablissements MICHELIN-MICHELIN & Cie Tyre with beads having an improved structure, and assembly of said tyre and a suitable rim

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1086571B (en) * 1956-12-14 1960-08-04 Firestone Tire & Rubber Co Motor vehicle wheel consisting of a rim and a tubeless tire
GB2061199A (en) * 1979-10-20 1981-05-13 Dunlop Ltd Tyre and wheel assemblies
WO1994013498A1 (en) * 1992-12-11 1994-06-23 Compagnie Generale Des Etablissements Michelin - Michelin & Cie Tyre, rim, supporting ring and assembly comprising same
WO1995023073A1 (en) * 1994-02-28 1995-08-31 Compagnie Générale des Etablissements MICHELIN-MICHELIN & Cie Tyre with beads having an improved structure, and assembly of said tyre and a suitable rim

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001089861A1 (en) * 2000-05-22 2001-11-29 Societe De Technologie Michelin Tyre comprising a reinforcing profiled section in at least one sidewall, and mounted tyre/rim assembly
US6688354B2 (en) 2000-05-22 2004-02-10 Michelin Recherche Et Technique S.A. Tire comprising a reinforcing profiled element in at least one sidewall, and tire/rim assembly comprising such a tire
FR2809348A1 (en) * 2000-05-26 2001-11-30 Michelin Soc Tech Tire has bead with axially inner end on larger diameter circle than axially outer end and crescent shaped reinforced profile with surface matching shape of radial carcass reinforcement
EP1674294A1 (en) * 2004-12-22 2006-06-28 The Goodyear Tire & Rubber Company Pneumatic run-flat tire
WO2019234370A1 (en) * 2018-06-08 2019-12-12 Compagnie Generale Des Etablissements Michelin Flexible adapter and rim assembly for a rolling assembly
FR3082147A1 (en) * 2018-06-08 2019-12-13 Compagnie Generale Des Etablissements Michelin FLEXIBLE RIM AND EXTENSION ASSEMBLY FOR ROLLING ASSEMBLY
CN112272618A (en) * 2018-06-08 2021-01-26 米其林集团总公司 Flexible adapter and rim assembly for rolling assembly
CN112272618B (en) * 2018-06-08 2023-12-26 米其林集团总公司 Flexible adapter for rolling assembly and rim assembly
US11932049B2 (en) 2018-06-08 2024-03-19 Maxion Wheels Holding Gmbh Flexible adapter and rim assembly for a rolling assembly

Also Published As

Publication number Publication date
FR2788239B1 (en) 2001-02-16
WO2000041467A3 (en) 2002-09-26
FR2788239A1 (en) 2000-07-13
AU2434500A (en) 2000-08-01

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