EP3055142A1 - Tread comprising a directional tread pattern - Google Patents

Tread comprising a directional tread pattern

Info

Publication number
EP3055142A1
EP3055142A1 EP14780870.3A EP14780870A EP3055142A1 EP 3055142 A1 EP3055142 A1 EP 3055142A1 EP 14780870 A EP14780870 A EP 14780870A EP 3055142 A1 EP3055142 A1 EP 3055142A1
Authority
EP
European Patent Office
Prior art keywords
tread
groove
median plane
block
blocks
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP14780870.3A
Other languages
German (de)
French (fr)
Inventor
Bertrand Fraenkel
Nicolas Jamot
Estelle PERRIER
Hélène EMORINE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Michelin Recherche et Technique SA Switzerland
Compagnie Generale des Etablissements Michelin SCA
Michelin Recherche et Technique SA France
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 Michelin Recherche et Technique SA Switzerland, Compagnie Generale des Etablissements Michelin SCA, Michelin Recherche et Technique SA France filed Critical Michelin Recherche et Technique SA Switzerland
Publication of EP3055142A1 publication Critical patent/EP3055142A1/en
Withdrawn legal-status Critical Current

Links

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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0302—Tread patterns directional pattern, i.e. with main rolling direction
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1369—Tie bars for linking block elements and bridging the groove
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0311—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
    • B60C2011/0313—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation directional type
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0374—Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1209—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe straight at the tread surface

Definitions

  • the present invention relates to a tread of a tire for a motor vehicle comprising a directional sculpture, more particularly, the invention relates to a tread having a plurality of curved grooves extending on either side of the tread. a median plane.
  • US4057089 discloses a tread of a tire for a motor vehicle having a directional sculpture. More particularly, this tread comprises a plurality of curved grooves extending on either side of a median plane. The curved grooves start respectively from one of the edges of the tread and extend towards the median plane, without reaching this median plane.
  • the sculpture thus comprises a central main block extending in a circumferential direction to which is attached a plurality of secondary blocks delimited by the curved grooves.
  • the tread, disclosed in US4057089 has a number of disadvantages. In the first place, the presence of the central main block disturbs the flow of water and does not make optimal the evacuation of this water by the curved grooves. In addition, this tread has adhesion characteristics on limited snowy ground. [04] There is therefore a need to provide a directional sculpture tread with enhanced wet grip and snow grip characteristics. DEFINITIONS
  • Thread of a tire means a quantity of rubber material delimited by lateral surfaces and by two main surfaces, one of which is intended to come into contact with a roadway when the tire is rolling.
  • block on a tread means a raised element delimited by grooves and comprising side walls and a contact face, the latter being intended to come into contact with a roadway during driving.
  • Midplane means a plane perpendicular to the axis of rotation of the tire and separating the tread into two parts.
  • Median plane means an area of the tread centered on the median plane and having a width of not more than 10% of the width of the tread.
  • Thread edge means the area where the transition between the tread and a sidewall of the tire occurs, when the tread is mounted on the tire.
  • “Incision” means a cut in the tread delimiting material walls, the width of this cutout is appropriate to allow the at least partial contact of the material walls during the passage in the contact with floor.
  • the width for an incision is at most equal to 2 millimeters (mm).
  • groove means a cut in the tread delimiting material walls, the width of this cutout is such that the walls can not come into contact with each other under usual conditions rolling. The width for a groove is greater than 2 millimeters.
  • Axial direction means a direction parallel to the axis of rotation of the tire.
  • Circumferential direction means a direction that is tangent to any circle centered on the axis of rotation. This direction is perpendicular to the axial direction.
  • oblique direction is meant a direction which has an axial component and a non-zero circumferential component.
  • the invention relates to a tread for a tire comprising a plurality of blocks of rubber material formed on either side of a median plane separating said tread in two parts. Each block extends continuously at the median plane to the outside of the tread. Each block is delimited by a first groove opening on a first edge of the tread and having a certain curvature C and a second groove offset circumferentially with respect to the first groove and having the same curvature C. The block is delimited by a third groove extending from the first groove at the median plane of the tread to a second edge of the tread opposite the first edge, the second groove of the tread leading into the third groove.
  • the invention it is thus possible to connect the different grooves together at the median plane.
  • This connection of the grooves improves the evacuation of the water towards the outside of the tire during rolling.
  • the blocks of the tread respectively have a generally oblique edge at the median plane. This edge, formed by the third groove, improves the grip on snowy ground and more particularly the transverse grip.
  • the fact that the blocks are continuous from the median plane to the edges of the tread, that is to say that the blocks are not interrupted by grooves makes it possible to limit the disturbances in the evacuation of the tread. water out of the tread.
  • the block has an enlargement at the median plane.
  • each block comprises a plurality of incisions opening on the contact face forming plots, these plots being oblique and generally parallel to each other, the distance between two adjacent traces being between 3 mm and 8 mm.
  • the tread comprises connecting means of rubber material connecting two adjacent blocks at the median plane.
  • the connecting means are arranged near the junction areas of the grooves, these connecting means have a height h less than the height H of the blocks.
  • the connecting means comprises an inclined surface.
  • FIG. 1 shows schematically a partial view of a tread, according to a first embodiment of the invention
  • Figure 2 schematically shows a second embodiment of the invention
  • Figure 3 shows schematically a third embodiment of the invention
  • Figure 4 schematically shows a fourth embodiment of the invention
  • FIG. 5 represents a sectional view along the axis A-A of a connecting means of FIG. 4.
  • Figure 1 shows schematically a partial view of a tread 1 according to a first embodiment of the invention.
  • the tread 1 comprises a plurality of blocks 3 of rubber material, a block of which has been grayed out here to facilitate the understanding of the invention.
  • the blocks are formed on either side of a median plane 5 separating the tread 1 into two parts.
  • Each block 3 here extends continuously at the median plane 5 towards the outside of the tread, that is to say that the blocks are not divided by circumferential grooves and / or oblique in the direction of the tread. from the outside of the tread. More particularly, each block is delimited by a first groove 7, a second groove 9 and a third groove 11.
  • the first groove 7 extends at the median plane 5 towards a first edge 8 of the tread and the second groove 9 also extends at the median plane 5 to the same first edge 8 but with a shift in the circumferential direction.
  • the first groove 7 and the second groove 9 have the same curvature C.
  • the third groove 11 extends, for its part, from the first groove 7 at the median plane 5 to a second edge 10 of the tread opposite the first edge 8.
  • the second groove 9 opening into the third groove 11 at the median plane, it then forms an effective network for discharging the water out of the tread.
  • Figure 2 shows an alternative embodiment in which each block 3 has a widening 13 at the median plane. This widening has a width L greater than at least 10% of the width of the block of Figure 1 at the median plane.
  • the blocks 3 comprise incisions forming plots 17 on the contact faces 15 of the blocks. These lines 17 are here oblique and the distance D between two adjacent traces is between 3 mm and 8 mm.
  • Figures 4 and 5 show a final variant in which the tread comprises connecting means 19 of rubber material connecting two adjacent blocks 3 at the median plane 5. These connecting means 19 are arranged near the zones junction grooves. These connecting means 19 have a height h less than the height H of the blocks 3 of out to limit disturbances in water volume exchanges between the grooves. In addition, the connecting means 19 comprise an inclined surface 21 to facilitate the evacuation of water out of the tread.
  • the median plane 5 divides the tread 1 into two parts which have generally the same width. In a variant, the widths of these two parts are different.
  • the curvature of the third groove 11 is identical, in absolute value, to the curvature of the first groove and the second groove.
  • the values of the curvatures between, on the one hand, the first groove and the second groove and, on the other hand, the third groove are different.
  • the block 3 has an enlargement at the median plane.
  • the block may comprise a plurality of enlargements succeeding one another in steps at the level of the median plane.

Landscapes

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

Abstract

The invention relates to a tire tread comprising a plurality of blocks (3) made of rubber material, which are formed on both sides of a mid-plane (5) separating said tread (1) into two portions. Each block (3) continuously extends from the mid-plane to the outside of the tread. Each block is defined by two grooves (7, 9) which lead to a first edge (8) of the tread and have a curvature C, and by a third groove (11) which extends from the first groove (7), at the mid-plane (5) of the tread, to a second edge (10) of said tread that is opposite the first edge (8), the second groove (9) leading into said third groove (11).

Description

BANDE DE ROULEMENT COMPORTANT UNE SCULPTURE  TREAD BAND COMPRISING A SCULPTURE
DIRECTIONNELLE  ROCKER
DOMAINE DE L'INVENTION FIELD OF THE INVENTION
[01] La présente invention concerne une bande de roulement d'un pneumatique pour véhicule automobile comportant une sculpture directionnelle, plus particulièrement, l'invention concerne une bande de roulement présentant une pluralité de rainures courbes s'étendant de part et d'autre d'un plan médian. [01] The present invention relates to a tread of a tire for a motor vehicle comprising a directional sculpture, more particularly, the invention relates to a tread having a plurality of curved grooves extending on either side of the tread. a median plane.
ETAT DE LA TECHNIQUE STATE OF THE ART
[02] Le document US4057089 divulgue une bande de roulement d'un pneumatique pour véhicule automobile comportant une sculpture directionnelle. Plus particulièrement, cette bande de roulement comprend une pluralité de rainures courbes s'étendant de part et d'autre d'un plan médian. Les rainures courbes débutent respectivement à partir d'un des bords de la bande de roulement et se prolongent en direction du plan médian, sans atteindre ce plan médian. La sculpture comporte ainsi un bloc principal central s'étendant selon une direction circonférentielle auquel est rattachée une pluralité de blocs secondaires délimités par les rainures courbes. [03] La bande de roulement, divulguée dans le document US4057089, présente un certain nombre d'inconvénients. En premier lieu, la présence du bloc principal central perturbe l'écoulement de l'eau et ne rend pas optimal l'évacuation de cette eau par les rainures courbes. En outre, cette bande de roulement présente des caractéristiques d'adhérences sur sol enneigé limité. [04] Il existe donc un besoin de proposer une bande de roulement à sculpture directionnelle présentant des caractéristiques d'adhérences sur sol mouillé et sur sol enneigé améliorées. DEFINITIONS [02] US4057089 discloses a tread of a tire for a motor vehicle having a directional sculpture. More particularly, this tread comprises a plurality of curved grooves extending on either side of a median plane. The curved grooves start respectively from one of the edges of the tread and extend towards the median plane, without reaching this median plane. The sculpture thus comprises a central main block extending in a circumferential direction to which is attached a plurality of secondary blocks delimited by the curved grooves. [03] The tread, disclosed in US4057089, has a number of disadvantages. In the first place, the presence of the central main block disturbs the flow of water and does not make optimal the evacuation of this water by the curved grooves. In addition, this tread has adhesion characteristics on limited snowy ground. [04] There is therefore a need to provide a directional sculpture tread with enhanced wet grip and snow grip characteristics. DEFINITIONS
[05] Par « pneumatique », on entend tous les types de bandages élastiques soumis à une pression interne ou non. [05] "Pneumatic" means all types of elastic bandages subjected to internal pressure or not.
[06] Par « bande de roulement » d'un pneumatique, on entend une quantité de matériau caoutchoutique délimitée par des surfaces latérales et par deux surfaces principales dont l'une est destinée à entrer en contact avec une chaussée lorsque le pneumatique roule. [06] "Tread" of a tire means a quantity of rubber material delimited by lateral surfaces and by two main surfaces, one of which is intended to come into contact with a roadway when the tire is rolling.
[07] Par « bloc » sur une bande de roulement, on entend un élément en relief délimité par des rainures et comprenant des parois latérales et une face de contact, cette dernière étant destinée à venir en contact avec une chaussée pendant le roulage. [07] By "block" on a tread means a raised element delimited by grooves and comprising side walls and a contact face, the latter being intended to come into contact with a roadway during driving.
[08] Par « plan médian », on entend un plan perpendiculaire à l'axe de rotation du pneumatique et séparant la bande de roulement en deux parties. [08] "Midplane" means a plane perpendicular to the axis of rotation of the tire and separating the tread into two parts.
[09] Par « au niveau du plan médian », on entend une zone de la bande de roulement centrée sur le plan médian et présentant une largeur correspondant à au plus 10% de la largeur de la bande de roulement. [09] "Median plane" means an area of the tread centered on the median plane and having a width of not more than 10% of the width of the tread.
[10] Par « bord de la bande de roulement », on entend la zone où a lieu la transition entre la bande de roulement et un flanc du pneumatique, lorsque cette bande de roulement est montée sur le pneumatique. [10] "Tread edge" means the area where the transition between the tread and a sidewall of the tire occurs, when the tread is mounted on the tire.
[11] Par « incision », on entend une découpure dans la bande de roulement délimitant des parois de matière, la largeur de cette découpure est appropriée pour permettre la mise en contact au moins partielle des parois de matière lors du passage dans le contact avec le sol. La largeur pour une incision est au plus égale à 2 millimètres (mm). [11] "Incision" means a cut in the tread delimiting material walls, the width of this cutout is appropriate to allow the at least partial contact of the material walls during the passage in the contact with floor. The width for an incision is at most equal to 2 millimeters (mm).
[12] Par « rainure », on entend une découpure dans la bande de roulement délimitant des parois de matière, la largeur de cette découpure est telle que les parois ne peuvent pas venir en contact l'une contre l'autre dans des conditions usuelles de roulage. La largeur pour une rainure est supérieure à 2 millimètres. [13] Par « direction axiale », on entend une direction parallèle à l'axe de rotation du pneu. [12] "groove" means a cut in the tread delimiting material walls, the width of this cutout is such that the walls can not come into contact with each other under usual conditions rolling. The width for a groove is greater than 2 millimeters. [13] "Axial direction" means a direction parallel to the axis of rotation of the tire.
[14] Par « direction circonférentielle », on entend une direction qui est tangente à tout cercle centré sur l'axe de rotation. Cette direction est perpendiculaire à la direction axiale. [14] "Circumferential direction" means a direction that is tangent to any circle centered on the axis of rotation. This direction is perpendicular to the axial direction.
[15] Par « direction oblique », on entend une direction qui possède une composante axiale et une composante circonférentielle non nulles. [15] By "oblique direction" is meant a direction which has an axial component and a non-zero circumferential component.
RESUME DE L'INVENTION [16] L'invention concerne une bande de roulement pour pneumatique comportant une pluralité de blocs en matériau caoutchoutique formés de part et d'autre d'un plan médian séparant cette bande de roulement en deux parties. Chaque bloc s'étend de manière continue au niveau du plan médian vers l'extérieur de la bande de roulement. Chaque bloc est délimité par une première rainure débouchant sur un premier bord de la bande de roulement et présentant une certaine courbure C et par une seconde rainure décalée circonférentiellement par rapport à la première rainure et présentant la même courbure C. Le bloc est délimité par une troisième rainure s 'étendant à partir de la première rainure au niveau du plan médian de la bande de roulement vers un second bord de cette bande de roulement opposé au premier bord, la seconde rainure de la bande de roulement débouchant dans cette troisième rainure. SUMMARY OF THE INVENTION [16] The invention relates to a tread for a tire comprising a plurality of blocks of rubber material formed on either side of a median plane separating said tread in two parts. Each block extends continuously at the median plane to the outside of the tread. Each block is delimited by a first groove opening on a first edge of the tread and having a certain curvature C and a second groove offset circumferentially with respect to the first groove and having the same curvature C. The block is delimited by a third groove extending from the first groove at the median plane of the tread to a second edge of the tread opposite the first edge, the second groove of the tread leading into the third groove.
[17] Grâce à l'invention, il est ainsi possible de relier les différentes rainures entre elles au niveau du plan médian. Cette connexion des rainures améliore l'évacuation de l'eau vers l'extérieur du pneumatique au cours des roulages. En outre, les blocs de la bande roulement présentent respectivement une arête globalement oblique au niveau du plan médian. Cette arête, formée par la troisième rainure, améliore l'adhérence sur sol enneigé et plus particulièrement l'adhérence transversale. Enfin, le fait que les blocs soient continus du plan médian jusqu'aux bords de la bande de roulement, c'est-à-dire que les blocs ne sont pas interrompus par des rainures, permet de limiter les perturbations dans l'évacuation de l'eau hors de la bande de roulement. [18] Dans une variante de réalisation, la courbure C est déterminée mathématiquement, au moins en partie, par l'équation : Y=kX2, avec X une coordonnée s 'étendant selon une direction circonférentielle de la bande de roulement, Y une coordonnée s 'étendant selon une direction axiale et k une constante supérieure ou égale à 1. [17] Thanks to the invention, it is thus possible to connect the different grooves together at the median plane. This connection of the grooves improves the evacuation of the water towards the outside of the tire during rolling. In addition, the blocks of the tread respectively have a generally oblique edge at the median plane. This edge, formed by the third groove, improves the grip on snowy ground and more particularly the transverse grip. Finally, the fact that the blocks are continuous from the median plane to the edges of the tread, that is to say that the blocks are not interrupted by grooves, makes it possible to limit the disturbances in the evacuation of the tread. water out of the tread. [18] In an alternative embodiment, the curvature C is determined mathematically, at least in part, by the equation: Y = kX 2 , with X a coordinate extending in a circumferential direction of the tread, Y a coordinate extending in an axial direction and k a constant greater than or equal to 1.
[19] On améliore ainsi l'élancement des rainures, c'est-à-dire la distance, projetée sur l'axe circonférentiel, entre une extrémité de la rainure présente au niveau du plan médian et une autre extrémité de la rainure présente au niveau du bord de la bande de roulement. De cette manière, on favorise l'évacuation de l'eau hors de la bande de roulement au cours des roulages. [19] Thus improves the slenderness of the grooves, that is to say the distance, projected on the circumferential axis, between one end of the groove present at the median plane and another end of the groove present at the level of the edge of the tread. In this way, it promotes the evacuation of water out of the tread during travel.
[20] Dans une autre variante de réalisation, le bloc présente un élargissement au niveau du plan médian. [20] In another embodiment, the block has an enlargement at the median plane.
[21] On agrandit ainsi la surface de contact du bloc avec le sol au niveau du plan médian. De cette manière, on limite l'usure du bloc et on garantit une plus grande pérennité du pneumatique. [21] Thus enlarges the contact surface of the block with the ground at the median plane. In this way, the block wear is limited and greater durability of the tire is ensured.
[22] Dans une autre variante de réalisation, chaque bloc comprend une pluralité d'incisions débouchant sur la face de contact en formant des tracés, ces tracés étant obliques et globalement parallèles entre eux, la distance entre deux tracés adjacents étant comprise entre 3 mm et 8 mm. [22] In another embodiment, each block comprises a plurality of incisions opening on the contact face forming plots, these plots being oblique and generally parallel to each other, the distance between two adjacent traces being between 3 mm and 8 mm.
[23] On augmente ainsi le nombre d'arêtes sur la surface du bloc ce qui permet d'améliorer l'adhérence du pneumatique sur un sol enneigé. [23] This increases the number of edges on the block surface which improves the grip of the tire on a snowy ground.
[24] Dans une autre variante de réalisation, la bande de roulement comprend des moyens de liaison en matériau caoutchoutique liant deux blocs adjacents au niveau du plan médian. Les moyens de liaison sont disposés à proximité de zones de jonction des rainures, ces moyens de liaison ont une hauteur h inférieure à la hauteur H des blocs. [25] En liant les blocs entre eux, les moyens de liaison améliorent la rigidité des blocs au niveau du plan médian, on limite ainsi l'arrachage de ces blocs au niveau de ce plan médian. [24] In another embodiment, the tread comprises connecting means of rubber material connecting two adjacent blocks at the median plane. The connecting means are arranged near the junction areas of the grooves, these connecting means have a height h less than the height H of the blocks. [25] By linking the blocks together, the connecting means improves the rigidity of the blocks at the median plane, thus limiting the pulling of these blocks at this median plane.
[26] Dans une autre variante de réalisation, les moyens de liaison comportent une surface inclinée. [26] In another alternative embodiment, the connecting means comprises an inclined surface.
[27] Cette surface inclinée favorise l'évacuation de l'eau hors de la bande de roulement. [27] This inclined surface promotes the evacuation of water out of the tread.
BREVE DESCRIPTION DES DESSINS BRIEF DESCRIPTION OF THE DRAWINGS
[28] D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante, donnée à titre d'exemple, sans caractère limitatif, en regard des dessins annexés sur lesquels : - la figure 1 représente schématiquement une vue partielle d'une bande de roulement, selon un premier mode de réalisation de l'invention ; la figure 2 représente schématiquement une seconde variante de réalisation de l'invention ; la figure 3 représente schématiquement une troisième variante de réalisation de l'invention ; la figure 4 représente schématiquement une quatrième variante de réalisation de l'invention ; la figure 5 représente une vue en coupe selon l'axe A-A d'un moyen de liaison de la figure 4. [28] Other features and advantages of the invention will emerge from the following description, given by way of example, without limitation, with reference to the accompanying drawings in which: - Figure 1 shows schematically a partial view of a tread, according to a first embodiment of the invention; Figure 2 schematically shows a second embodiment of the invention; Figure 3 shows schematically a third embodiment of the invention; Figure 4 schematically shows a fourth embodiment of the invention; FIG. 5 represents a sectional view along the axis A-A of a connecting means of FIG. 4.
[29] Dans la description qui va suivre, des éléments sensiblement identiques ou similaires seront désignés par des références identiques. [30] La figure 1 représente schématiquement une vue partielle d'une bande de roulement 1 selon un premier mode de réalisation de l'invention. [29] In the following description, substantially identical or similar elements will be designated by identical references. [30] Figure 1 shows schematically a partial view of a tread 1 according to a first embodiment of the invention.
[31] La bande de roulement 1 comprend une pluralité de blocs 3 en matériau caoutchoutique, dont un bloc a été grisé ici pour faciliter la compréhension de l'invention. Les blocs sont formés de part et d'autre d'un plan médian 5 séparant la bande de roulement 1 en deux parties. Chaque bloc 3 s'étend ici de manière continue au niveau du plan médian 5 vers l'extérieur de la bande de roulement, c'est-à-dire que les blocs ne sont pas divisés par des rainures circonférentielles et/ou obliques en direction de l'extérieur de la bande de roulement. Plus particulièrement, chaque bloc est délimité par une première rainure 7, une seconde rainure 9 et une troisième rainure 11. La première rainure 7 s'étend au niveau du plan médian 5 vers un premier bord 8 de la bande de roulement et la seconde rainure 9 s'étend également au niveau du plan médian 5 vers ce même premier bord 8 mais avec un décalage selon la direction circonférentielle. La première rainure 7 et la seconde rainure 9 présentent la même courbure C. Cette courbure est ici déterminée mathématiquement par l'équation Y=kX2, avec X une coordonnée prise selon une direction circonférentielle, Y une coordonnée prise selon une direction axiale et k une constante supérieure ou égale à 1. [31] The tread 1 comprises a plurality of blocks 3 of rubber material, a block of which has been grayed out here to facilitate the understanding of the invention. The blocks are formed on either side of a median plane 5 separating the tread 1 into two parts. Each block 3 here extends continuously at the median plane 5 towards the outside of the tread, that is to say that the blocks are not divided by circumferential grooves and / or oblique in the direction of the tread. from the outside of the tread. More particularly, each block is delimited by a first groove 7, a second groove 9 and a third groove 11. The first groove 7 extends at the median plane 5 towards a first edge 8 of the tread and the second groove 9 also extends at the median plane 5 to the same first edge 8 but with a shift in the circumferential direction. The first groove 7 and the second groove 9 have the same curvature C. This curvature is here determined mathematically by the equation Y = kX 2 , with X a coordinate taken in a circumferential direction, Y a coordinate taken in an axial direction and k a constant greater than or equal to 1.
[32] La troisième rainure 11 s'étend, quant à elle, à partir de la première rainure 7 au niveau du plan médian 5 vers un second bord 10 de la bande de roulement opposé au premier bord 8. La seconde rainure 9 débouchant dans la troisième rainure 11 au niveau du plan médian, on forme alors un réseau efficace d'évacuation de l'eau hors de la bande de roulement. [32] The third groove 11 extends, for its part, from the first groove 7 at the median plane 5 to a second edge 10 of the tread opposite the first edge 8. The second groove 9 opening into the third groove 11 at the median plane, it then forms an effective network for discharging the water out of the tread.
[33] La figure 2 représente une variante de réalisation dans laquelle chaque bloc 3 présente un élargissement 13 au niveau du plan médian. Cet élargissement présente une largeur L supérieure à au moins 10% de la largeur du bloc de la figure 1 au niveau du plan médian. [33] Figure 2 shows an alternative embodiment in which each block 3 has a widening 13 at the median plane. This widening has a width L greater than at least 10% of the width of the block of Figure 1 at the median plane.
[34] Dans le mode de réalisation présenté à la figure 3, les blocs 3 comprennent des incisions formant des tracés 17 sur les faces de contact 15 des blocs. Ces tracés 17 sont ici obliques et la distance D entre deux tracés adjacents est comprise entre 3 mm et 8 mm. [34] In the embodiment shown in FIG. 3, the blocks 3 comprise incisions forming plots 17 on the contact faces 15 of the blocks. These lines 17 are here oblique and the distance D between two adjacent traces is between 3 mm and 8 mm.
[35] Les figures 4 et 5 présentent une dernière variante dans laquelle la bande de roulement comprend des moyens de liaison 19 en matériau caoutchoutique liant deux blocs adjacents 3 au niveau du plan médian 5. Ces moyens de liaison 19 sont disposés à proximité des zones de jonction des rainures. Ces moyens de liaison 19 présentent une hauteur h inférieure à la hauteur H des blocs 3 de sortent à limiter les perturbations dans les échanges de volume d'eau entre les rainures. De plus, les moyens de liaison 19 comportent une surface inclinée 21 pour faciliter l'évacuation de l'eau hors de la bande de roulement. [35] Figures 4 and 5 show a final variant in which the tread comprises connecting means 19 of rubber material connecting two adjacent blocks 3 at the median plane 5. These connecting means 19 are arranged near the zones junction grooves. These connecting means 19 have a height h less than the height H of the blocks 3 of out to limit disturbances in water volume exchanges between the grooves. In addition, the connecting means 19 comprise an inclined surface 21 to facilitate the evacuation of water out of the tread.
[36] L'invention n'est pas limitée aux exemples décrits et représentés et diverses modifications peuvent y être apportées sans sortir de son cadre. [36] The invention is not limited to the examples described and shown and various modifications can be made without departing from its scope.
[37] Ainsi sur la figure 1, le plan médian 5 divise la bande de roulement 1 en deux parties qui ont globalement la même largeur. En variante, les largeurs de ces deux parties sont différentes. [37] Thus in Figure 1, the median plane 5 divides the tread 1 into two parts which have generally the same width. In a variant, the widths of these two parts are different.
[38] De plus, sur cette même figure 1, la courbure de la troisième rainure 11 est identique, en valeur absolue, à la courbure de la première rainure et de la seconde rainure. En variante, les valeurs des courbures entre, d'une part, la première rainure et la seconde rainure et d'autre part la troisième rainure sont différentes. [38] Moreover, in this same Figure 1, the curvature of the third groove 11 is identical, in absolute value, to the curvature of the first groove and the second groove. In a variant, the values of the curvatures between, on the one hand, the first groove and the second groove and, on the other hand, the third groove are different.
[39] Dans la figure 2, le bloc 3 présente un élargissement au niveau du plan médian. En variante, le bloc peut comprendre une pluralité d'élargissements se succédant, en escalier, au niveau du plan médian. [39] In Figure 2, the block 3 has an enlargement at the median plane. Alternatively, the block may comprise a plurality of enlargements succeeding one another in steps at the level of the median plane.

Claims

REVENDICATIONS
1. Bande de roulement pour pneumatique comportant une pluralité de blocs (3) en matériau caoutchoutique formés de part et d'autre d'un plan médian (5) séparant cette bande de roulement (1) en deux parties, chaque bloc (3) s'étendant de manière continue au niveau du plan médian vers l'extérieur de la bande de roulement, chaque bloc étant délimité par une première rainure (7) débouchant sur un premier bord (8) de la bande de roulement et présentant une certaine courbure C et par une seconde rainure (9) décalée circonférentiellement par rapport à la première rainure (7) et présentant la même courbure C, caractérisée en ce que le bloc est délimité par une troisième rainure (11) s'étendant à partir de la première rainure (7) au niveau du plan médian (5) de la bande de roulement vers un second bord (10) de cette bande de roulement opposé au premier bord (8), la seconde rainure (9) de la bande de roulement débouchant dans cette troisième rainure (11).  A tread for a tire comprising a plurality of blocks (3) of rubber material formed on either side of a median plane (5) separating said tread (1) into two parts, each block (3). extending continuously at the median plane towards the outside of the tread, each block being delimited by a first groove (7) opening on a first edge (8) of the tread and having a certain curvature C and a second groove (9) circumferentially offset relative to the first groove (7) and having the same curvature C, characterized in that the block is delimited by a third groove (11) extending from the first groove (7) at the median plane (5) of the tread towards a second edge (10) of this tread opposite the first edge (8), the second groove (9) of the tread emerging in this third groove (11).
2. Bande de roulement selon la revendication 1, caractérisée en ce que la courbure C est déterminée mathématiquement, au moins en partie, par l'équation : Y=kX2, avec X une coordonnée prise selon une direction circonférentielle de la bande de roulement, Y une coordonnée prise selon une direction axiale et k une constante supérieure ou égale à 1. 2. Tread according to claim 1, characterized in that the curvature C is determined mathematically, at least in part, by the equation: Y = kX 2 , with X a coordinate taken in a circumferential direction of the tread , Y a coordinate taken in an axial direction and k a constant greater than or equal to 1.
3. Bande de roulement selon l'une des revendications 1 à 2, caractérisée en ce que le bloc présente un élargissement (13) au niveau du plan médian. 3. tread according to one of claims 1 to 2, characterized in that the block has a widening (13) at the median plane.
4. Bande de roulement selon l'une quelconque des revendications 1 à 3, les blocs ayant une face de contact (15) avec un sol lors du roulage du pneumatique caractérisée en ce que chaque bloc (3) comprend une pluralité d'incisions débouchant sur la face de contact (15) en formant des tracés (17), ces tracés étant obliques et globalement parallèles entre eux, la distance D entre deux tracés adjacents étant comprise entre 3 mm et 8 mm. 4. Tread according to any one of claims 1 to 3, the blocks having a contact face (15) with a ground during the rolling of the tire characterized in that each block (3) comprises a plurality of incisions opening on the contact face (15) forming plots (17), these plots being oblique and generally parallel to each other, the distance D between two adjacent plots being between 3 mm and 8 mm.
5. Bande de roulement selon l'une quelconque des revendications 1 à 4, les blocs (3) de la bande de roulement ayant une hauteur H, caractérisée en ce que cette bande de roulement comprend des moyens de liaison (19) en matériau caoutchoutique liant deux blocs adjacents au niveau du plan médian (5), lesdits moyens de liaison (19) étant disposés à proximité de zones de jonction des rainures, lesdits moyens de liaison ayant une hauteur h inférieure à la hauteur H des blocs (3). 5. tread according to any one of claims 1 to 4, the blocks (3) of the tread having a height H, characterized in that the tread comprises connecting means (19) of rubber material linking two adjacent blocks at the median plane (5), said connecting means (19) being arranged near the junction areas of the grooves, said connecting means having a height h less than the height H of the blocks (3).
6. Bande de roulement selon l'une quelconque des revendications 4 à 5, caractérisée en ce que les moyens de liaison comportent une surface inclinée (21). 6. tread according to any one of claims 4 to 5, characterized in that the connecting means comprise an inclined surface (21).
EP14780870.3A 2013-10-07 2014-10-06 Tread comprising a directional tread pattern Withdrawn EP3055142A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1359675A FR3011512B1 (en) 2013-10-07 2013-10-07 TREAD BAND COMPRISING DIRECTIONAL SCULPTURE
PCT/EP2014/071316 WO2015052122A1 (en) 2013-10-07 2014-10-06 Tread comprising a directional tread pattern

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JP (1) JP2016531806A (en)
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DE102015225417A1 (en) * 2015-12-16 2017-06-22 Continental Reifen Deutschland Gmbh Vehicle tires
DE102017203219A1 (en) 2017-02-28 2018-08-30 Continental Reifen Deutschland Gmbh Vehicle tires
JP6980446B2 (en) * 2017-07-31 2021-12-15 Ｔｏｙｏ Ｔｉｒｅ株式会社 Pneumatic tires
JP7159968B2 (en) * 2019-04-26 2022-10-25 横浜ゴム株式会社 pneumatic tire
CN110239285B (en) * 2019-05-09 2021-05-25 正新橡胶（中国）有限公司 Pneumatic tire
JP7372550B2 (en) * 2020-04-14 2023-11-01 横浜ゴム株式会社 tire
DE102021206704A1 (en) * 2021-06-29 2022-12-29 Continental Reifen Deutschland Gmbh Vehicle Pneumatic Tires

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IT1248635B (en) * 1990-01-10 1995-01-21 Uniroyal Englebert Gmbh RADIAL TIRE FOR VEHICLES, WITH EXTREMITY OF THE PROFILE ELEMENTS, IN THE BELTED AREA OF THE TREAD, DEVELOPED IN THE FORK SHAPE
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CA2923514A1 (en) 2015-04-16
WO2015052122A1 (en) 2015-04-16
CN105612064B (en) 2018-05-04
FR3011512B1 (en) 2017-02-24
FR3011512A1 (en) 2015-04-10
CN105612064A (en) 2016-05-25
JP2016531806A (en) 2016-10-13
RU2016112513A (en) 2017-11-15

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