WO2018122484A1 - Tyre with sidewall bars arranged with a variable pitch - Google Patents
Tyre with sidewall bars arranged with a variable pitch Download PDFInfo
- Publication number
- WO2018122484A1 WO2018122484A1 PCT/FR2017/053464 FR2017053464W WO2018122484A1 WO 2018122484 A1 WO2018122484 A1 WO 2018122484A1 FR 2017053464 W FR2017053464 W FR 2017053464W WO 2018122484 A1 WO2018122484 A1 WO 2018122484A1
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- bars
- tire
- sidewall
- tire according
- pitch
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Classifications
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- 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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/02—Arrangement of grooves or ribs
Definitions
- the present invention relates to a tire for a motor vehicle having a plurality of rubber bars on at least one sidewall. STATE OF THE ART
- the invention provides a tire of rubber material comprising a tread, a first sidewall and a second sidewall extending said tread according to an outer sidewall profile, the sidewalls having a plurality of hollow areas. separated by strips of rubber material, the bars and the recesses being arranged one after the other in the circumference of the tire, said webs not exceeding the outer sidewall profile, in which the webs are arranged in the circumference of the tire in at least two sets of different step bars (P1, P2).
- the distance between two adjacent bars is not constant in the circumference of the tire since there are at least two different values of pitch P1 and P2.
- the step values are measured between two median lines of consecutive bars, at identical radial positions. There are at least two different distances.
- the difference between the pitch values P1 and P2 is at least 5%, and preferably greater than 20%, and more preferably between 25 and 50%.
- the variation of pitch between the bars of the series of bars allows to spread the vibration spectrum of the tire structure over a wider frequency range.
- the pitch, and therefore the distance between the adjacent bars the interference of the eigenfrequencies is improved and the perception of the noise by the occupants of the vehicle is reduced.
- the difference between the pitch values P1 and P2 results from a difference in width of the bars.
- the difference between the pitch values P1 and P2 results from a difference in width between the bars.
- Yet another variant involves a variation of these two parameters simultaneously, preferably by ensuring that the rate of notch volume (TEV) is constant. This characteristic makes it possible to make uniform tires that do not generate a variation in radial stiffness during taxiing.
- the series of bars comprise at least three different values of pitch.
- This embodiment allows to hide more vibration.
- each sidewall of the tire comprises a series of bars, the pitch (P1, P2) series of bars of each sidewall being different.
- the strips have a height of between 3 mm and 10 mm, more preferably between 4 mm and 8 mm.
- less two bars of the same side have a different height.
- the bars have an inclination relative to a radial direction (Z).
- the value of this inclination of the bars is different from one flank to the other. This adds another characteristic contributing to the reduction of vibration.
- the bars are arranged between a point A and a point E,
- said point A being disposed at the intersection of the radially outer surface of the tread and the sidewall, and a radial axis ZZ 'distant from the equatorial plane of a length L A between 1 ⁇ 2 (L-60mm) and 1 ⁇ 2 (L-10mm), where L is the nominal flange size, and
- said point E being disposed, optionally, in a radius included in:
- all or part of bars are interrupted by a circumferential groove and said groove extends between a zone of maximum width of the sidewall and the tread.
- the presence of the circumferential groove allows to remove the material and thus lighten the tire, it also allows to mechanically decouple the tire top area of the sidewall and thus reduces vibration.
- the bars may be present over the entire circumferential length of the tire sidewall.
- the bars on the sides are made of a material preferably identical to that of the flanks.
- the invention also provides a mounted assembly comprising a rim and a tire as defined in one of the preceding claims. DESCRIPTION OF THE FIGURES
- FIG. 1A shows, schematically, a section in a radial plane of a tire mounted on a rim
- FIGS. 1B and 1C show, schematically, sections along the sidewalls of a tire in the circumferential direction to highlight examples of profiles flanks;
- FIG. 2A, 2B and 2C show, schematically and in three dimensions, a portion of a sidewall and the corresponding tread of examples of the tires;
- FIG. 3 shows, schematically, an enlarged portion of a side including bars
- Figure 4 shows a sectional view of two adjacent bars along the axis AA of Figure 3;
- FIG. 5A and 5B show, in a variant, a portion of a radially outer portion of a sidewall and the corresponding tread in three dimensions;
- FIG. 6 is a schematic representation of a tire section showing two angular positions of bars in opposition on each sidewall of the tire.
- radial or meridian plane means a plane which contains the axis of rotation of the tire.
- Rubber material means a diene elastomer, that is to say in known manner an elastomer derived from at least in part (that is to say homopolymer or a copolymer) of monomers dienes (monomers carriers of two carbon-carbon double bonds, conjugated or not).
- Standardwall of a tire means a side portion of the tire disposed between the tread of the tire and a bead of the tire.
- External profile means the virtual outer envelope connecting the outermost points of the bars of the two sides and in which the bars are included.
- Average height of the bars means the average height of all the bars of a sidewall.
- “Middle line of ME bar” means a longitudinal virtual line passing through a bar passing substantially through its center, so that the bar is subdivided into two substantially equal parts.
- “Pitch” means a distance separating two consecutive bars, this distance being measured between two median lines of consecutive bars, at substantially identical radial positions.
- Series of bars means an assembly comprising at least two bars having identical pitch characteristics.
- partially interrupts means that the radially upper end of a bar partially cuts the circumferential groove.
- the "groove” is an area of a given width located around the point A, and having a longitudinal void rate greater than 70%.
- the radius R A is a function of the length L A , itself a function of the length L.
- the nominal flange size L is defined by the flange size of a tire mounted on the rim and inflated; the flange size being, according to the invention, the distance between the outside of the flanks of an inflated tire, by incorporating the surface relief of the flanks. Ri corresponds to the radius of the point on the outer surface of the flank furthest from the median plane.
- the general-purpose passenger car tire 1 comprises a radially inner carcass reinforcement 2 to a general reference belt reinforcement 3, said belt reinforcement 3 being radially interior to a strip of reinforcement.
- bearing 4 itself connected to two beads 5 via two sides 6a and 6b.
- the beads 5 are intended to come into contact with a rim 7 (partially shown) having rim hook heels 7b.
- Each bead comprises at least one circumferential reinforcing element 7a.
- the flanks comprise, on their surface, a series of strips 8 regularly alternated with recesses 9 (shown in Figures 2A, 2B and 2C).
- Figure 1A can be seen a bar 8, in section, having a continuous neutral fiber. It is recalled here that a neutral fiber is called a neutral axis which passes substantially in the center of the volume of each bar, and which undergoes neither shortening nor elongation when it is subjected to compression and / or depression.
- the bars 8 are preferably disposed at the surface of the sidewall, a continuous neutral fiber length which extends from a point A to a point E.
- the point E can be arranged in two intervals.
- the interval I corresponds to R 2 ⁇ E ⁇ (0.75 Ri + 0.25R 2 ), R2 being the radius of the top of the rim hook and Ri being the radius of the nominal roll thickness.
- the interval II corresponds to 0.95Ri ⁇ E ⁇ (0.75R A + 0.25 Ri), Ri being the radius of the nominal coil size, and R A being the radius of the point A.
- the point E is disposed at a radius of 232 mm for a reference tire 205/55 R 16 mounted on a rim 6.5 J 16 for which RA is equal to 298 mm, R 2 is equal to 220 mm and Ri is 261 mm.
- the definition according to the invention of the coil size is adaptable to any type of envelope combined with any type of rim.
- Point A is disposed at the intersection of the radially outer surface of the tread and the sidewall, and an axis ZZ 'distant equatorial plane AA' of length L A between 1 ⁇ 2 (L -60 mm) and 1 ⁇ 2 (L-10 mm), L being the nominal flange size.
- R A is equal to 298mm.
- the bars are not rubber elements inserted or added in the rubber flanks, but are obtained by molding during the baking step. They are obtained in a manner similar to that of the sculptures made on the tread.
- the thickness "D" of the outside edge is greater at 0.1 mm and preferably between 0.2 and 2 mm, and even more preferably between 0.3 and 1.5 mm. It should be noted that the value of D is independent of the diameter of the cables of the carcass reinforcement. These characteristics provide an increase in the strength of the reinforcements of the carcass ply and therefore the robustness of the tire in the face of the shocks and the various aggressions to which the sidewalls are likely to be subjected, without counting the other advantages (previously described) obtained by the barrettes themselves.
- the bars 8 have a height H of between 3 mm and 10 mm, and more preferably between 4 mm and 8 mm.
- One embodiment of the invention provides that the height H of the bars of the first sidewall 6a differs from the height H of the bars of the second sidewall 6b.
- the height of the bars 8 of the first sidewall 6a differs by at least 10% and at most 50% and more preferably at least 20% and at most 35% of the height of the bars 8 of the second sidewall 6b.
- FIG. 1C illustrates an advantageous embodiment in which the height H of the bars varies along the circumference of a sidewall.
- the amplitude of the variations can then be comparable to the previously indicated amplitudes when the height varies from one flank to the other. It is thus possible to find bars of different heights alternating one by one, as shown in the example of FIG. 1C, or according to any other type of distribution of the bars of different heights.
- the height H is preferably the average height, as previously defined.
- a reference measurement point is preferably used for all the bars, so that measurements are made uniformly on each of the bars. The values obtained for all the bars are then averaged.
- Figure 2C illustrates an example for determining a reference point, using the intersection of the mid-height (or neutral) ME-ME and mid-height lines of the MHB-MHB arrays.
- Figure 2A shows an alternation of bars 8 and recesses 9, shown enlarged in Figures 3 and 4.
- Figure 2B shows a variant of Figure 2A where the bars are arranged at an angle ⁇ relative to the radial direction, shown in the figure by the RR axis.
- the angle ⁇ of inclination of the flank webs 1 is different from the angle tilting ⁇ of the bars of the second flank.
- Figure 6 schematically illustrates this embodiment.
- a strip 8 of a first sidewall 6a is arranged at an angle ⁇ .
- the right portion of the figure shows in dotted lines that we could see in transparency on the opposite side 6b.
- a bar illustrated in dotted line is thus inclined at a substantially opposite angle ⁇ '.
- At least two bars 8 of the same side have a different radial orientation.
- the angle ⁇ is advantageously between 10 ° and 50 °, and preferably between 20 ° and 30 °.
- FIG. 2C illustrates a preferred embodiment in which the bars 8 are organized in the circumference of the tire 1 in at least two series of pitch bars P1 and P2 that are different.
- the difference between the pitch values P1 and P2 is at least 5%, and preferably greater than 20%, and more preferably between 25% and 50%. This difference preferably results from a difference in width of the bars, or a difference in width between the bars.
- one of the preferred solutions involves a variation of these two parameters simultaneously, preferably by ensuring that the volume notch rate (VTE) is constant. This characteristic makes it possible to make uniform tires that do not generate a variation in radial stiffness during taxiing.
- the series of bars 8 comprise at least three different values of pitch.
- each sidewall 6a and 6b of the tire comprises a series of bars, the pitch P1 and P2 of the series of bars of each sidewall being different.
- the measurements of the pitch values are preferably made between the middle (or neutral) ME-ME lines of two adjacent bars.
- the median pitch that is to say the pitch measured halfway up the bars, is preferably used.
- the position of mid-height of the bars is illustrated in Figure 2C, by the line MHB-MHB.
- FIG. 4 illustrates an example of the profile of the bars. In this example, the draft angle ⁇ is about 8 °. Such a clearance angle value allows a release of the tire after firing without deterioration of the final structure.
- the strips have a ratio [sum of the widths of each strip in the circumferential direction over a radius Ri] / 2nR equal to 30%, at mid-height and have no angle with respect to the plane. radial.
- Figure 5A shows a three-dimensional representation of the radially outer portion 8a of the bars 8 and its enlargement in Figure 5B of Figure 5A.
- the portion 8a of each bar 8 and the recesses 9 are adjacent to a groove 10 disposed circumferentially on the surface of the tread 4 at its axially outermost end 4a.
- the groove 10 is not interrupted in its length.
- the groove 10 has an axial width "I" along the axis YY 'which can be between 2 and 10 mm, and a radial height "h" along the axis ZZ' of between 3 and 8 mm.
- the tire according to the invention is obtained after baking and molding in a baking mold in a conventional manner.
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Abstract
A pneumatic tyre (1) made of a rubber material comprises a tread (4), a first sidewall (6a) and a second sidewall (6b) adjoining the tread (4) with an outer sidewall profile, the sidewalls (6a, 6b) comprising a plurality of sipes (9) separated by rubber bars (8), the bars and the sipes being located next to each other around the circumference of the tyre (1), the bars (8) being arranged around the circumference of the tyre (1) in at least two series of bars having different pitches (P1, P2).
Description
Pneumatique comportant des barrettes de flanc avec un agencement à pas variable Pneumatic tire with side bars with variable pitch arrangement
DOMAINE DE L'INVENTION FIELD OF THE INVENTION
[0001] La présente invention concerne un pneumatique pour véhicule automobile comportant une pluralité de barrettes de gomme sur au moins un flanc. ETAT DE LA TECHNIQUE The present invention relates to a tire for a motor vehicle having a plurality of rubber bars on at least one sidewall. STATE OF THE ART
[0002] Il est connu du document WO2014/207093 de pourvoir au moins un flanc d'un pneumatique avec une pluralité de barrettes de gomme. Les barrettes de gomme sont réalisées par moulage lors d'une étape de cuisson du pneumatique. Elles sont ainsi obtenues de la même manière que les sculptures sur la bande de roulement du pneumatique. Ces barrettes de gomme permettent d'améliorer la robustesse du flanc vis-à-vis des chocs latéraux, sans pour autant changer fondamentalement les dimensions de ce flanc. [0003] Les barrettes de gomme sur le flanc du pneumatique créent une alternance de creux et de bosses sur le flanc du pneumatique. Au cours d'un roulage, cette alternance de creux et de bosses peut provoquer une excitation de la structure du pneumatique. A certaines vitesses de roulage, cette excitation génère des vibrations et donc du bruit auquel est sensible le conducteur du véhicule ou une personne externe à ce véhicule. It is known from WO2014 / 207093 to provide at least one sidewall of a tire with a plurality of rubber bars. The strips of rubber are made by molding during a step of baking the tire. They are thus obtained in the same way as the sculptures on the tread of the tire. These rubber strips make it possible to improve the strength of the sidewall with respect to lateral shocks, without fundamentally changing the dimensions of this sidewall. The rubber bars on the sidewall of the tire create an alternation of depressions and bumps on the sidewall of the tire. During a rolling, this alternation of hollows and bumps can cause an excitation of the tire structure. At certain speeds of travel, this excitation generates vibrations and therefore noise to which is sensitive the driver of the vehicle or a person external to the vehicle.
[0004] Il existe donc un besoin de proposer un pneumatique avec des flancs renforcés présentant une grande résistance mécanique tout en limitant les nuisances sonores générées par ce pneumatique lors des roulages. There is therefore a need to provide a tire with reinforced sidewalls having a high mechanical strength while limiting the noise generated by the tire during taxiing.
EXPOSE DE L'INVENTION
[0005] Pour ce faire, l'invention prévoit un pneumatique en matériau caoutchoutique comprenant une bande de roulement, un premier flanc et un second flanc prolongeant ladite bande de roulement selon un profil externe de flanc, les flancs comportant une pluralité de zones de creux séparées par des barrettes en matériau caoutchoutique, les barrettes et les creux étant disposés les uns à la suite des autres dans la circonférence du pneumatique, lesdites barrettes ne dépassant pas le profil externe de flanc, dans lequel les barrettes sont organisées dans la circonférence du pneumatique en au moins deux séries de barrettes de pas (P1 , P2) différents. SUMMARY OF THE INVENTION To do this, the invention provides a tire of rubber material comprising a tread, a first sidewall and a second sidewall extending said tread according to an outer sidewall profile, the sidewalls having a plurality of hollow areas. separated by strips of rubber material, the bars and the recesses being arranged one after the other in the circumference of the tire, said webs not exceeding the outer sidewall profile, in which the webs are arranged in the circumference of the tire in at least two sets of different step bars (P1, P2).
[0006] La distance entre deux barrettes adjacentes n'est pas constance dans la circonférence du pneumatique puisqu'on retrouve au moins deux valeurs différentes de pas P1 et P2. Les valeurs de pas sont mesurées entre deux lignes médianes de barrettes consécutives, à des positions radiales identiques. Il existe au moins deux distances différentes. The distance between two adjacent bars is not constant in the circumference of the tire since there are at least two different values of pitch P1 and P2. The step values are measured between two median lines of consecutive bars, at identical radial positions. There are at least two different distances.
[0007] De manière avantageuse, l'écart entre les valeurs de pas P1 et P2 est d'au moins 5%, et préférentiellement supérieur à 20%, et plus préférentiellement compris entre 25 et 50 %. [0007] Advantageously, the difference between the pitch values P1 and P2 is at least 5%, and preferably greater than 20%, and more preferably between 25 and 50%.
[0008] La variation de pas entre les barrettes des séries de barrettes permet d'étaler le spectre de vibrations de la structure du pneumatique sur une plage de fréquence plus large. En modifiant le pas, et donc la distance entre les barrettes adjacentes, on améliore le brouillage des fréquences propres et on diminue la perception du bruit par les occupants du véhicule. The variation of pitch between the bars of the series of bars allows to spread the vibration spectrum of the tire structure over a wider frequency range. By modifying the pitch, and therefore the distance between the adjacent bars, the interference of the eigenfrequencies is improved and the perception of the noise by the occupants of the vehicle is reduced.
[0009] Selon un mode de réalisation avantageux, l'écart entre les valeurs de pas P1 et P2 résulte d'une différence de largeur des barrettes. According to an advantageous embodiment, the difference between the pitch values P1 and P2 results from a difference in width of the bars.
[0010] Selon un autre mode de réalisation avantageux, l'écart entre les valeurs de pas P1 et P2 résulte d'une différence de largeur entre les barrettes.
[0011] Encore une autre variante implique une variation de ces deux paramètres simultanément, de préférence en faisant en sorte que le que le taux d'entaillement volumique (TEV) soit constant. Cette caractéristique permet de faire des pneumatiques uniformes, ne générant pas de variation de raideur radiale pendant le roulage. According to another advantageous embodiment, the difference between the pitch values P1 and P2 results from a difference in width between the bars. Yet another variant involves a variation of these two parameters simultaneously, preferably by ensuring that the rate of notch volume (TEV) is constant. This characteristic makes it possible to make uniform tires that do not generate a variation in radial stiffness during taxiing.
[0012] Selon une variante de réalisation, les séries de barrettes comprennent aux moins trois valeurs différentes de pas. According to an alternative embodiment, the series of bars comprise at least three different values of pitch.
[0013] Ce mode de réalisation permet d'occulter davantage de vibrations. This embodiment allows to hide more vibration.
[0014] Selon encore une variante avantageuse, chaque flanc du pneumatique comporte une série de barrettes, le pas (P1 , P2) des séries de barrettes de chaque flanc étant différent. According to another advantageous variant, each sidewall of the tire comprises a series of bars, the pitch (P1, P2) series of bars of each sidewall being different.
[0015] En évitant des fréquences identiques sur les deux flancs, les modes vibratoires sont encore mieux maîtrisés. [0016] De manière avantageuse, les barrettes ont une hauteur comprise entre 3 mm et 10 mm, en plus préférentiellement entre 4 mm et 8 mm. By avoiding identical frequencies on both sides, vibratory modes are even better controlled. Advantageously, the strips have a height of between 3 mm and 10 mm, more preferably between 4 mm and 8 mm.
[0017] Selon encore un mode de réalisation avantageux, moins deux barrettes d'un même flanc ont une hauteur différente. According to yet another advantageous embodiment, less two bars of the same side have a different height.
[0018] Selon un autre mode de réalisation, les barrettes présentent une inclinaison par rapport à une direction radiale (Z). According to another embodiment, the bars have an inclination relative to a radial direction (Z).
[0019] Selon une variante avantageuse, la valeur de cette inclinaison des barrettes est différente d'un flanc à l'autre.
[0020] On ajoute ainsi une autre caractéristique contribuant à la réduction des vibrations. According to an advantageous variant, the value of this inclination of the bars is different from one flank to the other. This adds another characteristic contributing to the reduction of vibration.
[0021] De manière avantageuse, les barrettes sont disposées entre un point A et un point E, Advantageously, the bars are arranged between a point A and a point E,
ledit point A étant disposé à l'intersection de la surface radialement extérieure de la bande de roulement et du flanc, et d'un axe radial ZZ' distant du plan équatorial d'une longueur LA comprise entre ½ (L-60mm) et ½ (L- 10mm), L étant la grosseur boudin nominale, et said point A being disposed at the intersection of the radially outer surface of the tread and the sidewall, and a radial axis ZZ 'distant from the equatorial plane of a length L A between ½ (L-60mm) and ½ (L-10mm), where L is the nominal flange size, and
- ledit point E étant disposé, au choix, dans un rayon compris dans : said point E being disposed, optionally, in a radius included in:
o R2 < E < (0,75 Ri + 0,25R2), R2 étant le rayon du haut du crochet de jante et Ri étant le rayon de la grosseur boudin nominal, ou dans o R 2 <E <(0.75 Ri + 0.25R 2 ), where R2 is the radius of the top of the rim hook and Ri is the radius of the nominal rim size, or
o 0,95Ri < E < (0,75RA + 0,25 Ri), Ri étant le rayon de la grosseur boudin nominal, et RA étant le rayon du point A. [0022] Egalement de manière avantageuse, tout ou partie des barrettes est interrompue par un sillon circonférentiel et ledit sillon s'étend entre une zone de largeur maximale du flanc et la bande de roulement. o 0.95Ri <E <(0.75R A + 0.25 Ri), Ri being the radius of the nominal coil size, and R A being the radius of point A. [0022] Also advantageously, all or part of bars are interrupted by a circumferential groove and said groove extends between a zone of maximum width of the sidewall and the tread.
[0023] La présence du sillon circonférentiel permet d'enlever de la matière et ainsi d'alléger le pneumatique, il permet aussi de découpler mécaniquement la zone sommet du pneu de la zone flanc et permet ainsi de diminuer les vibrations. The presence of the circumferential groove allows to remove the material and thus lighten the tire, it also allows to mechanically decouple the tire top area of the sidewall and thus reduces vibration.
[0024] Les barrettes peuvent être présentes sur toute la longueur circonférentielle du flanc du pneumatique. The bars may be present over the entire circumferential length of the tire sidewall.
[0025] Les barrettes présentes sur les flancs sont constituées en un matériau de préférence identique à celui des flancs. The bars on the sides are made of a material preferably identical to that of the flanks.
[0026] L'invention prévoit également un ensemble monté comprenant une jante et un pneumatique tel que défini selon l'une des revendications précédentes.
DESCRIPTION DES FIGURES The invention also provides a mounted assembly comprising a rim and a tire as defined in one of the preceding claims. DESCRIPTION OF THE FIGURES
[0027] L'invention va maintenant être décrite à l'aide des exemples et des dessins qui suivent et qui sont donnés uniquement à titre d'illustration, et sur lesquels : The invention will now be described with the aid of the examples and drawings which follow and which are given solely by way of illustration, and in which:
- la figure 1A représente, de manière schématique, une coupe dans un plan radial d'un pneumatique monté sur une jante ; - Figure 1A shows, schematically, a section in a radial plane of a tire mounted on a rim;
- les figures 1 B et 1 C représentent, de manière schématique, des coupes le long des flancs d'un pneumatique selon la direction circonférentielle pour mettre en évidence des exemples de profils des barrettes de flancs ; - Figures 1B and 1C show, schematically, sections along the sidewalls of a tire in the circumferential direction to highlight examples of profiles flanks;
- les figures 2A, 2B et 2C représentent, de manière schématique et en trois dimensions, une portion d'un flanc et de la bande de roulement correspondante d'exemples des pneumatiques ; - Figures 2A, 2B and 2C show, schematically and in three dimensions, a portion of a sidewall and the corresponding tread of examples of the tires;
- la figure 3 représente, de manière schématique, une portion agrandie d'un flanc comprenant des barrettes ; - Figure 3 shows, schematically, an enlarged portion of a side including bars;
- la figure 4 représente une vue en coupe, de deux barrettes adjacentes, selon l'axe AA de la figure 3 ; - Figure 4 shows a sectional view of two adjacent bars along the axis AA of Figure 3;
- les figures 5A et 5B représentent, selon une variante, une portion d'une partie radialement extérieure d'un flanc et la bande de roulement correspondante en trois dimensions ; - Figures 5A and 5B show, in a variant, a portion of a radially outer portion of a sidewall and the corresponding tread in three dimensions;
- la figure 6 est une représentation schématique d'une coupe de pneumatique montrant deux positions angulaires de barrettes en opposition sur chacun des flancs du pneumatique. - Figure 6 is a schematic representation of a tire section showing two angular positions of bars in opposition on each sidewall of the tire.
DESCRIPTION DETAILLEE DE L'INVENTION DETAILED DESCRIPTION OF THE INVENTION
DEFINITIONS [0028] On dénomme ci-après par : DEFINITIONS [0028] Hereinafter referred to as:
- « direction longitudinale ou circonférentielle » : direction de roulement du pneumatique,
- « direction radiale » : direction coupant l'axe de rotation du pneumatique et perpendiculaire à celui-ci, - "longitudinal or circumferential direction": rolling direction of the tire, - "radial direction": direction intersecting the axis of rotation of the tire and perpendicular to it,
- « direction axiale » : direction parallèle à l'axe de rotation du pneumatique, - "axial direction": direction parallel to the axis of rotation of the tire,
- « radialement intérieur à » : signifie plus proche de l'axe de rotation, - « radialement extérieur à » : signifie plus éloigné de l'axe de rotation,- 'radially inner to' means closer to the axis of rotation, - 'radially outside' means more distant from the axis of rotation,
- « plan équatorial ou plan médian » : plan perpendiculaire à l'axe de rotation du pneumatique et qui divise le pneumatique en deux moitiés sensiblement égales, - "equatorial plane or median plane": plane perpendicular to the axis of rotation of the tire and which divides the tire into two substantially equal halves,
- « direction transversale du pneumatique » : direction parallèle à l'axe de rotation, - "transverse direction of the tire": direction parallel to the axis of rotation,
- « plan radial ou méridien » : un plan qui contient l'axe de rotation du pneumatique. - "radial or meridian plane" means a plane which contains the axis of rotation of the tire.
- Par « matériau caoutchoutique », on entend un élastomère diénique, c'est-à- dire de manière connue un élastomère issu d'au moins en partie (c'est-à-dire homopolymère ou un copolymère) de monomères diènes (monomères porteurs de deux doubles liaisons carbone-carbone, conjuguées ou non). - "Rubber material" means a diene elastomer, that is to say in known manner an elastomer derived from at least in part (that is to say homopolymer or a copolymer) of monomers dienes (monomers carriers of two carbon-carbon double bonds, conjugated or not).
- Par « pneumatique », on entend tous les types de bandages élastiques soumis à une pression interne ou non. - "Pneumatic" means all types of elastic bandages subjected to internal pressure or not.
- Par « flanc d'un pneumatique », on entend une partie latérale du pneumatique disposée entre la bande de roulement du pneumatique et un talon de ce pneumatique. - "Sidewall of a tire" means a side portion of the tire disposed between the tread of the tire and a bead of the tire.
- Par « profil externe », on entend l'enveloppe externe virtuelle reliant les points les plus à l'extérieur des barrettes des deux flancs et dans laquelle les barrettes sont comprises. - Par « hauteur moyenne des barrettes », on entend la hauteur moyenne de l'ensemble des barrettes d'un flanc. - "External profile" means the virtual outer envelope connecting the outermost points of the bars of the two sides and in which the bars are included. - "Average height of the bars" means the average height of all the bars of a sidewall.
- Par « ligne médiane de barrette ME » on entend une ligne virtuelle longitudinale traversant une barrette en passant sensiblement par son centre, de sorte que la barrette est subdivisée en deux parties sensiblement égales.
- Par « pas », on entend une distance séparant deux barrettes consécutives, cette distance étant mesurée entre deux lignes médianes de barrettes consécutives, à des positions radiales sensiblement identiques. "Middle line of ME bar" means a longitudinal virtual line passing through a bar passing substantially through its center, so that the bar is subdivided into two substantially equal parts. "Pitch" means a distance separating two consecutive bars, this distance being measured between two median lines of consecutive bars, at substantially identical radial positions.
- Par « pas médian » on entend le pas mesuré sensiblement à mi-hauteur des barrettes. - By "not median" means the pitch measured substantially halfway up the bars.
- Par « série de barrettes » on entend un ensemble comprenant au moins deux barrettes présentant des caractéristiques de pas identiques. "Series of bars" means an assembly comprising at least two bars having identical pitch characteristics.
- Par les termes « interrompt partiellement », on entend que l'extrémité radialement supérieure d'une barrette coupe partiellement le sillon circonférentiel. The term "partially interrupts" means that the radially upper end of a bar partially cuts the circumferential groove.
- Par les termes « interrompt totalement », on entend que l'extrémité radialement supérieure d'une barrette rejoint l'extrémité axialement extérieure de la bande de roulement qui lui est la plus proche. - By the terms "completely interrupts" is meant that the radially upper end of a bar joins the axially outer end of the tread which is closest thereto.
- Le « sillon » est une zone d'une largeur donnée située aux environs du point A, et présentant un taux de vide longitudinal supérieure à 70%. - The "groove" is an area of a given width located around the point A, and having a longitudinal void rate greater than 70%.
- Par le terme « régulier », on définit que les barrettes disposées entre les points A-E sont disposées à l'aplomb l'une de l'autre selon une direction radiale, avec éventuellement une symétrie, et de manière uniforme. - By the term "regular", it is defined that the bars arranged between the points A-E are disposed plumb with each other in a radial direction, with possibly symmetry, and uniformly.
- Par le terme « irrégulier », on définit que les barrettes disposées entre les points A-E sont disposées de manière décalée selon deux directions radiales parallèles sans symétrie et de manière non uniforme. By the term "irregular", it is defined that the bars arranged between the points A-E are arranged in an offset manner in two parallel radial directions without symmetry and in a non-uniform manner.
- Le rayon RA est fonction de la longueur LA, elle-même fonction de la longueur L. - The radius R A is a function of the length L A , itself a function of the length L.
- On définit la grosseur boudin nominale L par la grosseur boudin d'un pneumatique monté sur jante et gonflé ; la grosseur boudin étant, selon l'invention, la distance entre l'extérieur des flancs d'un pneumatique gonflé, en incorporant le relief de surface des flancs. Ri correspond au rayon du point situé sur la surface extérieure du flanc le plus éloigné du plan médian. - The nominal flange size L is defined by the flange size of a tire mounted on the rim and inflated; the flange size being, according to the invention, the distance between the outside of the flanks of an inflated tire, by incorporating the surface relief of the flanks. Ri corresponds to the radius of the point on the outer surface of the flank furthest from the median plane.
- REQ est le rayon au point le plus large du pneu (largeur = L) : RA > REQ.
DESCRIPTION DES FIGURES - REQ is the radius at the widest point of the tire (width = L): R A > REQ. DESCRIPTION OF THE FIGURES
[0029] Comme le montre la figure 1A, le pneumatique pour véhicule de tourisme de référence générale 1 comprend une armature de carcasse 2 radialement intérieure à un renforcement de ceinture de référence générale 3, ledit renforcement de ceinture 3 étant radialement intérieur à une bande de roulement 4 elle-même reliée à deux bourrelets 5 par l'intermédiaire de deux flancs 6a et 6b. Les bourrelets 5 sont destinés à entrer en contact avec une jante 7 (partiellement représentée) ayant des hauts de crochet de jante 7b. Chaque bourrelet comprend au moins un élément de renforcement circonférentiel 7a. Les flancs comportent, sur leur surface, une série de barrettes 8 régulièrement alternées avec des creux 9 (montrés sur les figures 2A, 2B et 2C). [0030] Sur la figure 1A on peut voir une barrette 8, en coupe, ayant une fibre neutre continue. On rappelle ici qu'on appelle une fibre neutre un axe neutre qui passe sensiblement au centre du volume de chaque barrette, et qui ne subit ni raccourcissement ni allongement lorsqu'il est soumis à une compression et/ou à une dépression. As shown in FIG. 1A, the general-purpose passenger car tire 1 comprises a radially inner carcass reinforcement 2 to a general reference belt reinforcement 3, said belt reinforcement 3 being radially interior to a strip of reinforcement. bearing 4 itself connected to two beads 5 via two sides 6a and 6b. The beads 5 are intended to come into contact with a rim 7 (partially shown) having rim hook heels 7b. Each bead comprises at least one circumferential reinforcing element 7a. The flanks comprise, on their surface, a series of strips 8 regularly alternated with recesses 9 (shown in Figures 2A, 2B and 2C). In Figure 1A can be seen a bar 8, in section, having a continuous neutral fiber. It is recalled here that a neutral fiber is called a neutral axis which passes substantially in the center of the volume of each bar, and which undergoes neither shortening nor elongation when it is subjected to compression and / or depression.
[0031] Comme le montre la figure 1A, les barrettes 8 sont de préférence disposées à la surface du flanc, sur une longueur de fibre neutre continue qui s'étend d'un point A à un point E. Le point E peut être disposé selon deux intervalles. As shown in Figure 1A, the bars 8 are preferably disposed at the surface of the sidewall, a continuous neutral fiber length which extends from a point A to a point E. The point E can be arranged in two intervals.
[0032] L'intervalle I correspond à R2 < E < (0,75 Ri + 0,25R2), R2 étant le rayon du haut du crochet de jante et Ri étant le rayon de la grosseur boudin nominal. The interval I corresponds to R 2 <E <(0.75 Ri + 0.25R 2 ), R2 being the radius of the top of the rim hook and Ri being the radius of the nominal roll thickness.
[0033] L'intervalle II correspond à 0,95Ri < E < (0,75RA + 0,25 Ri), Ri étant le rayon de la grosseur boudin nominal, et RA étant le rayon du point A.
[0034] Selon un exemple de réalisation, le point E est disposé à un rayon de 232 mm pour un pneumatique de référence 205/55 R 16 monté sur jante 6.5 J 16 pour lequel RA est égal à 298mm, R2 est égal à 220mm et Ri est égal à 261 mm. The interval II corresponds to 0.95Ri <E <(0.75R A + 0.25 Ri), Ri being the radius of the nominal coil size, and R A being the radius of the point A. According to an exemplary embodiment, the point E is disposed at a radius of 232 mm for a reference tire 205/55 R 16 mounted on a rim 6.5 J 16 for which RA is equal to 298 mm, R 2 is equal to 220 mm and Ri is 261 mm.
[0035] La définition selon l'invention de la grosseur boudin est adaptable à tout type d'enveloppe combiné à tout type de jante. The definition according to the invention of the coil size is adaptable to any type of envelope combined with any type of rim.
[0036] Le point A est disposé à l'intersection de la surface radialement extérieure de la bande de roulement et du flanc, et d'un axe ZZ' distant du plan équatorial AA' d'une longueur LA comprise entre ½ (L-60 mm) et ½ (L-10 mm), L étant la grosseur boudin nominale. Pour un pneumatique de référence 205/55 R 16, RA est égal à 298mm. [0037] Les barrettes ne sont pas des éléments de caoutchouc insérés ou ajoutés dans le caoutchouc des flancs, mais sont obtenues par moulage lors de l'étape de cuisson. Elles sont obtenues de manière similaire à celle des sculptures réalisées sur la bande de roulement. [0038] La figure 1 B montre que la présence des barrettes 8 de hauteur H permet en outre d'optimiser l'épaisseur du flanc : l'épaisseur « D » du flanc extérieur (en outre la zone située entre les barrettes) est supérieure à 0,1 mm et préférentiellement comprise entre 0,2 et 2mm, et encore plus préférentiellement entre 0,3 et 1 ,5 mm. Il est à noter que la valeur de D est indépendante du diamètre des câbles de l'armature de carcasse. Ces caractéristiques procurent une augmentation de la résistance des renforts de la nappe carcasse et donc de la robustesse du pneumatique face aux chocs et aux diverses agressions auxquelles les flancs sont susceptibles d'être soumis, sans compter les autres avantages (préalablement décrits) obtenus par les barrettes elles-mêmes.
[0039] Les barrettes 8 ont une hauteur H comprise entre 3 mm et 10 mm, et plus préférentiellement entre 4 mm et 8 mm. Un des modes de réalisation de l'invention prévoit que la hauteur H des barrettes du premier flanc 6a diffère de la hauteur H des barrettes du second flanc 6b. La hauteur des barrettes 8 du premier flanc 6a diffère d'au moins 10% et au plus de 50% et plus préférentiellement d'au moins 20% et au plus de 35% de la hauteur des barrettes 8 du second flanc 6b. Point A is disposed at the intersection of the radially outer surface of the tread and the sidewall, and an axis ZZ 'distant equatorial plane AA' of length L A between ½ (L -60 mm) and ½ (L-10 mm), L being the nominal flange size. For a reference tire 205/55 R 16, R A is equal to 298mm. The bars are not rubber elements inserted or added in the rubber flanks, but are obtained by molding during the baking step. They are obtained in a manner similar to that of the sculptures made on the tread. FIG. 1B shows that the presence of the bars 8 of height H further makes it possible to optimize the thickness of the sidewall: the thickness "D" of the outside edge (in addition the zone situated between the bars) is greater at 0.1 mm and preferably between 0.2 and 2 mm, and even more preferably between 0.3 and 1.5 mm. It should be noted that the value of D is independent of the diameter of the cables of the carcass reinforcement. These characteristics provide an increase in the strength of the reinforcements of the carcass ply and therefore the robustness of the tire in the face of the shocks and the various aggressions to which the sidewalls are likely to be subjected, without counting the other advantages (previously described) obtained by the barrettes themselves. The bars 8 have a height H of between 3 mm and 10 mm, and more preferably between 4 mm and 8 mm. One embodiment of the invention provides that the height H of the bars of the first sidewall 6a differs from the height H of the bars of the second sidewall 6b. The height of the bars 8 of the first sidewall 6a differs by at least 10% and at most 50% and more preferably at least 20% and at most 35% of the height of the bars 8 of the second sidewall 6b.
[0040] La figure 1 C illustre un mode avantageux de réalisation dans lequel la hauteur H des barrettes varie le long de la circonférence d'un flanc. L'amplitude des variations peut alors être comparable aux amplitudes préalablement indiquées lorsque la hauteur varie d'un flanc à l'autre. On peut ainsi retrouver des barrettes de hauteurs différentes soit en alternance une par une, comme illustré dans l'exemple de la figure 1 C, ou selon tout autre type de répartition des barrettes de hauteurs différentes. En outre, il peut y avoir plus de deux hauteurs H de barrettes. FIG. 1C illustrates an advantageous embodiment in which the height H of the bars varies along the circumference of a sidewall. The amplitude of the variations can then be comparable to the previously indicated amplitudes when the height varies from one flank to the other. It is thus possible to find bars of different heights alternating one by one, as shown in the example of FIG. 1C, or according to any other type of distribution of the bars of different heights. In addition, there may be more than two heights H of bars.
[0041] La hauteur H est avantageusement la hauteur moyenne, telle que préalablement définie. Pour effectuer les mesures de valeur de hauteur, on utilise de préférence un point de mesure de référence pour l'ensemble des barrettes, de façon à effectuer les mesures de façon uniforme sur chacune des barrettes. On fait ensuite la moyenne des valeurs obtenues pour l'ensemble des barrettes. La figure 2C illustre un exemple permettant de déterminer un point de référence, en utilisant l'intersection des lignes médianes (ou de fibre neutre) ME-ME et de mi-hauteur des barrettes MHB-MHB. The height H is preferably the average height, as previously defined. In order to carry out the height value measurements, a reference measurement point is preferably used for all the bars, so that measurements are made uniformly on each of the bars. The values obtained for all the bars are then averaged. Figure 2C illustrates an example for determining a reference point, using the intersection of the mid-height (or neutral) ME-ME and mid-height lines of the MHB-MHB arrays.
[0042] La figure 2A représente une alternance de barrettes 8 et de creux 9, représentée de manière agrandie sur les figures 3 et 4. Figure 2A shows an alternation of bars 8 and recesses 9, shown enlarged in Figures 3 and 4.
[0043] La figure 2B représente une variante de la figure 2A où les barrettes sont disposées selon un angle β par rapport à la direction radiale, représentée sur la figure par l'axe R-R. Selon un mode de réalisation préférentiel de l'invention, l'angle d'inclinaison β des barrettes du 1er flanc est différent de l'angle
d'inclinaison β des barrettes du second flanc. La figure 6 illustre schématiquement ce mode de réalisation. On observe à gauche de la figure, une barrette 8 d'un premier flanc 6a agencée selon un angle β. La portion de droite de la figure montre en pointillé ce que l'on pourrait apercevoir en transparence sur le flanc opposé 6b. Une barrette illustrée en pointillé est ainsi inclinée selon un angle sensiblement opposé β'. Figure 2B shows a variant of Figure 2A where the bars are arranged at an angle β relative to the radial direction, shown in the figure by the RR axis. According to a preferred embodiment of the invention, the angle β of inclination of the flank webs 1 is different from the angle tilting β of the bars of the second flank. Figure 6 schematically illustrates this embodiment. On the left of the figure, a strip 8 of a first sidewall 6a is arranged at an angle β. The right portion of the figure shows in dotted lines that we could see in transparency on the opposite side 6b. A bar illustrated in dotted line is thus inclined at a substantially opposite angle β '.
[0044] Par ailleurs, dans une variante de réalisation, au moins deux barrettes 8 d'un même flanc ont une orientation radiale différente. L'angle β est avantageusement compris entre 10° et 50°, et préférentiellement entre 20° et 30°. Furthermore, in an alternative embodiment, at least two bars 8 of the same side have a different radial orientation. The angle β is advantageously between 10 ° and 50 °, and preferably between 20 ° and 30 °.
[0045] La figure 2C illustre un mode préférentiel dans lequel les barrettes 8 sont organisées dans la circonférence du pneumatique 1 en au moins deux séries de barrettes de pas P1 et P2 différents. L'écart entre les valeurs de pas P1 et P2 est d'au moins 5%, et préférentiellement supérieur à 20%, et plus préférentiellement compris entre 25 % et 50 %. Cet écart résulte préférablement d'une différence de largeur des barrettes, ou d'une différence de largeur entre les barrettes. Toutefois, une des solutions préférentielles implique une variation de ces deux paramètres simultanément, de préférence en faisant en sorte que le que le taux d'entaillement volumique (TEV) soit constant. Cette caractéristique permet de faire des pneumatiques uniformes, ne générant pas de variation de raideur radiale pendant le roulage. Selon une autre variante, les séries de barrettes 8 comprennent aux moins trois valeurs différentes de pas. Encore en variante, chaque flanc 6a et 6b du pneumatique comporte une série de barrettes, le pas P1 et P2 des séries de barrettes de chaque flanc étant différent. Les mesures des valeurs de pas sont de préférence effectuées entre les lignes médianes (ou de fibre neutre) ME-ME de deux barrettes adjacentes. On utilise de préférence le pas médian, c'est-à-dire le pas mesuré à mi-hauteur des barrettes. La position de mi-hauteur des barrettes est illustrée à la figure 2C, par la ligne MHB-MHB.
[0046] La figure 4 illustre un exemple de profil des barrettes. Dans cet exemple, l'angle de dépouille a est d'environ 8°. Une telle valeur d'angle de dépouille permet un démoulage du pneumatique après cuisson sans détérioration de la structure finale. FIG. 2C illustrates a preferred embodiment in which the bars 8 are organized in the circumference of the tire 1 in at least two series of pitch bars P1 and P2 that are different. The difference between the pitch values P1 and P2 is at least 5%, and preferably greater than 20%, and more preferably between 25% and 50%. This difference preferably results from a difference in width of the bars, or a difference in width between the bars. However, one of the preferred solutions involves a variation of these two parameters simultaneously, preferably by ensuring that the volume notch rate (VTE) is constant. This characteristic makes it possible to make uniform tires that do not generate a variation in radial stiffness during taxiing. According to another variant, the series of bars 8 comprise at least three different values of pitch. In another variant, each sidewall 6a and 6b of the tire comprises a series of bars, the pitch P1 and P2 of the series of bars of each sidewall being different. The measurements of the pitch values are preferably made between the middle (or neutral) ME-ME lines of two adjacent bars. The median pitch, that is to say the pitch measured halfway up the bars, is preferably used. The position of mid-height of the bars is illustrated in Figure 2C, by the line MHB-MHB. FIG. 4 illustrates an example of the profile of the bars. In this example, the draft angle α is about 8 °. Such a clearance angle value allows a release of the tire after firing without deterioration of the final structure.
[0047] Selon ce mode de réalisation, les barrettes présentent un rapport [somme des largeurs de chaque barrette dans la direction circonférentielle sur un rayon Ri] / 2nR égale à 30%, à mi-hauteur et ne présentent aucun angle par rapport au plan radial. According to this embodiment, the strips have a ratio [sum of the widths of each strip in the circumferential direction over a radius Ri] / 2nR equal to 30%, at mid-height and have no angle with respect to the plane. radial.
[0048] La figure 5A montre une représentation en trois dimensions de la partie radialement extérieure 8a des barrettes 8 et son agrandissement sur la figure 5B de la figure 5A. Sur ces figures 5A et 5B, la partie 8a de chaque barrette 8 ainsi que les creux 9 sont adjacents à un sillon 10 disposé, de manière circonférentielle, sur la surface de la bande de roulement 4 à son extrémité axialement la plus extérieure 4a. Le sillon 10 n'est pas interrompu dans sa longueur. Selon ce mode particulier de réalisation, le sillon 10 a une largeur axiale « I » selon l'axe YY' pouvant être comprise entre 2 et 10mm, et une hauteur radiale « h » selon l'axe ZZ' comprise entre 3 et 8mm. Figure 5A shows a three-dimensional representation of the radially outer portion 8a of the bars 8 and its enlargement in Figure 5B of Figure 5A. In these Figures 5A and 5B, the portion 8a of each bar 8 and the recesses 9 are adjacent to a groove 10 disposed circumferentially on the surface of the tread 4 at its axially outermost end 4a. The groove 10 is not interrupted in its length. According to this particular embodiment, the groove 10 has an axial width "I" along the axis YY 'which can be between 2 and 10 mm, and a radial height "h" along the axis ZZ' of between 3 and 8 mm.
[0049] Le pneumatique selon l'invention est obtenu après cuisson et moulage dans un moule de cuisson de manière classique.
The tire according to the invention is obtained after baking and molding in a baking mold in a conventional manner.
Numéros de référence employés sur les figures Pneumatique Reference numbers used in Pneumatic figures
Armature de carcasse Carcass reinforcement
Renforcement de ceinture Belt reinforcement
Bande de roulement Tread
a Extrémité axialement la plus extérieure de la bande de roulement Bourreletsa Axially outermost end of the tread
a Premier FlancFirst Flank
b Second flancb Second flank
a Elément de renforcement circonférentiela circumferential reinforcement element
b Haut de crochet de jante b Rim hook top
Barrette barrette
a Extrémité de barrette a Bar end
Creux Hollow
Sillon circonférentiel
Circumferential groove
Claims
1 . Pneumatique (1 ) en matériau caoutchoutique comprenant une bande de roulement (4), un premier flanc (6a) et un second flanc (6b) prolongeant ladite bande de roulement (4) selon un profil externe de flanc, les flancs (6a, 6b) comportant une pluralité de zones de creux (9) séparées par des barrettes (8) en matériau caoutchoutique, les barrettes et les creux étant disposés les uns à la suite des autres dans la circonférence du pneumatique (1 ), lesdites barrettes (8) ne dépassant pas le profil externe de flanc, caractérisé en ce que les barrettes (8) sont organisées dans la circonférence du pneumatique (1 ) en au moins deux séries de barrettes de pas (P1 , P2) différents. 1. Tire (1) made of rubber material comprising a tread (4), a first sidewall (6a) and a second sidewall (6b) extending said tread (4) according to an external sidewall profile, the sidewalls (6a, 6b ) having a plurality of hollow areas (9) separated by rubber material webs (8), the webs and the recesses being arranged one after the other in the circumference of the tire (1), said webs (8) not exceeding the outer sidewall profile, characterized in that the webs (8) are arranged in the circumference of the tire (1) in at least two different sets of pitch bars (P1, P2).
2. Pneumatique selon la revendication 1 , caractérisé en ce que l'écart entre les valeurs de pas P1 et P2 est d'au moins 5%, et préférentiellement supérieur à 20%, et plus préférentiellement compris entre 25 et 50 %. 2. A tire according to claim 1, characterized in that the difference between the pitch values P1 and P2 is at least 5%, and preferably greater than 20%, and more preferably between 25 and 50%.
3. Pneumatique selon l'une des revendications 1 ou 2, caractérisé en ce que l'écart entre les valeurs de pas P1 et P2 résulte d'une différence de largeur des barrettes. 3. A tire according to one of claims 1 or 2, characterized in that the difference between the step values P1 and P2 results from a difference in width of the bars.
4. Pneumatique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'écart entre les valeurs de pas P1 et P2 résulte d'une différence de largeur entre les barrettes. 4. A tire according to any one of claims 1 to 3, characterized in that the difference between the pitch values P1 and P2 results from a difference in width between the bars.
5. Pneumatique selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les séries de barrettes (8) comprennent aux moins trois valeurs différentes de pas. 5. A tire according to any one of claims 1 to 4, characterized in that the series of bars (8) comprise at least three different values of pitch.
6. Pneumatique selon l'une quelconque des revendications 1 à 5, caractérisé en ce que chaque flanc (6a, 6b) du pneumatique comporte une série de barrettes, le pas (P1 , P2) des séries de barrettes de chaque flanc étant différent. 6. A tire according to any one of claims 1 to 5, characterized in that each side (6a, 6b) of the tire comprises a series of bars, the pitch (P1, P2) series of bars of each sidewall being different.
7. Pneumatique selon l'une quelconque des revendications 1 à 6, caractérisé en ce que lesdites barrettes (8) ont une hauteur comprise entre 3 mm et 10 mm, et plus préférentiellement entre 4 mm et 8 mm.
7. A tire according to any one of claims 1 to 6, characterized in that said bars (8) have a height of between 3 mm and 10 mm, and more preferably between 4 mm and 8 mm.
8. Pneumatique selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'au moins deux barrettes (8) d'un même flanc ont une hauteur différente. 8. A tire according to any one of claims 1 to 7, characterized in that at least two bars (8) of the same side have a different height.
9. Pneumatique selon l'une quelconque des revendications 1 à 8, caractérisé en ce que les barrettes (8) présentent une inclinaison par rapport à une direction radiale (Z). 9. A tire according to any one of claims 1 to 8, characterized in that the bars (8) have an inclination relative to a radial direction (Z).
10. Pneumatique selon la revendication 9, caractérisé en ce que la valeur de l'inclinaison des barrettes (8) est différente d'un flanc à l'autre. 10. A tire according to claim 9, characterized in that the value of the inclination of the bars (8) is different from one side to the other.
1 1 . Pneumatique selon l'une quelconque des revendications 1 à 10, caractérisé en ce que les barrettes (8) sont disposées entre un point A et un point E, 1 1. Tire according to any one of claims 1 to 10, characterized in that the webs (8) are arranged between a point A and a point E,
ledit point A étant disposé à l'intersection de la surface radialement extérieure de la bande de roulement et du flanc, et d'un axe radial ZZ' distant du plan équatorial d'une longueur LA comprise entre ½ (L-60mm) et ½ (L- 10mm), L étant la grosseur boudin nominale, et said point A being disposed at the intersection of the radially outer surface of the tread and the sidewall, and a radial axis ZZ 'distant from the equatorial plane with a length L A of between ½ (L-60mm) and ½ (L-10mm), where L is the nominal flange size, and
ledit point E étant disposé, au choix, dans un rayon compris dans : said point E being disposed, optionally, in a radius included in:
o R2 < E < (0,75 Ri + 0,25R2), R2 étant le rayon du haut du crochet de jante et Ri étant le rayon de la grosseur boudin nominal, ou dans o R 2 <E <(0.75 Ri + 0.25R 2 ), where R2 is the radius of the top of the rim hook and Ri is the radius of the nominal rim size, or
o 0,95Ri < E < (0,75RA + 0,25 Ri), Ri étant le rayon de la grosseur boudin nominal, et RA étant le rayon du point A. o 0.95Ri <E <(0.75R A + 0.25 Ri), Ri being the radius of the nominal flange size, and R A being the radius of the point A.
12. Pneumatique selon l'une quelconque des revendications 1 à 1 1 , caractérisé en ce que tout ou partie des barrettes (8) est interrompue par un sillon circonférentiel (10) et en ce que ledit sillon (10) s'étend entre une zone de largeur maximale du flanc et la bande de roulement (4). 12. A tire according to any one of claims 1 to 1 1, characterized in that all or part of the webs (8) is interrupted by a circumferential groove (10) and in that said groove (10) extends between a zone of maximum width of the sidewall and the tread (4).
13. Ensemble monté comprenant une jante et un pneumatique tel que défini selon l'une des revendications 1 à 12.
13. Mounted assembly comprising a rim and a tire as defined in one of claims 1 to 12.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1670792A FR3061079A1 (en) | 2016-12-27 | 2016-12-27 | PNEUMATIC COMPRISING FLANK BARS WITH A VARIABLE NO-ARRANGEMENT |
FR1670792 | 2016-12-27 |
Publications (1)
Publication Number | Publication Date |
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WO2018122484A1 true WO2018122484A1 (en) | 2018-07-05 |
Family
ID=58228296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2017/053464 WO2018122484A1 (en) | 2016-12-27 | 2017-12-08 | Tyre with sidewall bars arranged with a variable pitch |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR3061079A1 (en) |
WO (1) | WO2018122484A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0738617A2 (en) * | 1995-04-19 | 1996-10-23 | Bridgestone Corporation | Pneumatic tyres having an ornamentation comprised of many ridges |
EP2808181A1 (en) * | 2012-01-27 | 2014-12-03 | Bridgestone Corporation | Tire |
WO2014207093A1 (en) | 2013-06-28 | 2014-12-31 | Compagnie Generale Des Etablissements Michelin | Tyre |
WO2016043191A1 (en) * | 2014-09-17 | 2016-03-24 | 横浜ゴム株式会社 | Pneumatic tire |
-
2016
- 2016-12-27 FR FR1670792A patent/FR3061079A1/en not_active Withdrawn
-
2017
- 2017-12-08 WO PCT/FR2017/053464 patent/WO2018122484A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0738617A2 (en) * | 1995-04-19 | 1996-10-23 | Bridgestone Corporation | Pneumatic tyres having an ornamentation comprised of many ridges |
EP2808181A1 (en) * | 2012-01-27 | 2014-12-03 | Bridgestone Corporation | Tire |
WO2014207093A1 (en) | 2013-06-28 | 2014-12-31 | Compagnie Generale Des Etablissements Michelin | Tyre |
WO2016043191A1 (en) * | 2014-09-17 | 2016-03-24 | 横浜ゴム株式会社 | Pneumatic tire |
Also Published As
Publication number | Publication date |
---|---|
FR3061079A1 (en) | 2018-06-29 |
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