• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a tire (1) of rubber material comprising a tread (2), said tread comprising a tread surface (20) intended to come into contact with a road surface when the tire is rolling, this tread surface presenting sectional view a certain curvature. The tread surface (20) comprises on at least 80% of its surface a texture (3) in contrast with the remainder of the tire, this texture (3) comprising a plurality of elements protruding or recessed with respect to the surface 20), and each element extends perpendicularly (θ = 90 °) to the running surface (20) along the curvature of this running surface (20).
    公开号:FR3018224A1
    申请号:FR1451918
    申请日:2014-03-10
    公开日:2015-09-11
    发明作者:Olivier Muhlhoff；Jean Claude Desvignes；Bernard Villeneuve；Anthony Gueugneau；Jonathan Lejeune；Julien Besset
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION [1] The present invention relates to a tire for a motor vehicle comprising a tread, said tread comprising a tread surface.
    [0002] STATE OF THE ART [2] In order to mold the tread of a tire, it is known to use molding elements fixed in a mold. By molding element is meant any element of the mold which comprises a molding surface for molding a part of the tread of a tire. A molding element can thus be a block assembled on a sector of the mold or a bead attached to the radially inner surface of the mold. [3] It is possible to make a molding element by a selective melting process more commonly known as sintering. This process uses an energy beam to fuse a metal powder. "Energy beam" means an electromagnetic radiation (for example a laser beam) or a particle beam (for example an electron beam). [4] A sintering method using a laser, hereinafter referred to as a laser sintering method, is known from EP1641580. In this document, a first layer of metal powder is spread on a tray. All or part of the grains of this first layer of powder are then agglomerated by the beam of a laser according to the shape of the object that one wishes to obtain. Once this step is performed a second layer of powder is spread on the first layer of powder to be in turn selectively fused by laser. By repeating these layer spreading and laser melting operations, a sintered object is built layer by layer. [5] Such a sintered object is particularly shown in Figure 3 of EP0868955. In this figure, it is easy to distinguish the strata structure of the sintered object which is a molded element intended to be attached in a tire mold. However, this layered structure shows on the running surface of the molded tire, level lines that reflect this structure. This phenomenon of level lines is increased by the curvilinear nature of the mold. These level lines give the tire an unsightly appearance. [6] There is therefore a need to provide a solution to retain the use of the laser sintering process to manufacture the mold for molding the tire while attempting to improve the aesthetics of the tire. DEFINITIONS [7] "Pneumatic" means all types of elastic bandages subjected to internal pressure or not. [08] "Rubber material" means a diene elastomer, that is to say, in known manner an elastomer derived from at least a part (ie homopolymer or copolymer) of monomers dienes (monomers carrying two carbon-carbon double bonds, conjugated or not). [09] The term "tread" of a tire means a quantity of rubber material delimited by lateral surfaces and by two main surfaces, one of which, called the tread surface, is intended to come into contact with a tire. when the tire is rolling. 1101 By "texture" is meant an organized grouping of elements. [11] "Sidewall" of a tire means a side surface of the tire disposed between the tread of the tire and a bead of the tire. [12] "Strand" means a filamentary element whose height is at least twice the diameter of a disc of the same area as the average section of the strand. [13] "Lamellae" means elongated strands having a length at least twice their height. SUMMARY OF THE INVENTION [14] The invention relates to a rubber tire comprising a tread. This tread comprises a tread surface intended to come into contact with a roadway when the tire is rolling, this tread having a certain curvature in section. The tread surface comprises on at least 80% of its surface a texture that contrasts with the remainder of the tire, this texture comprising a plurality of elements protruding or recessed relative to the tread surface and each element extends perpendicularly. to the running surface along the curvature of this running surface. [15] By using a texture on the surface of the tread, masking the presence of level lines on this surface. [16] Moreover, the texture formed by the protuberant or hollow elements can "trap" all or part of the incident light rays that meet the surface of the tread. This makes it possible to give this running surface a blacker appearance and consequently it makes it possible to improve its contrast and therefore its visibility with respect to the rest of the tire. [17] In a non-limiting embodiment, at least 30% of the protuberance elements of the texture makes an angle α greater than 40 ° with respect to a plane tangential to the running surface and at most 25% of the protruding elements. the texture makes an angle a less than 20 ° with respect to the tangent plane. This further improves the ability of the texture to trap light. [18] In a non-limiting embodiment, all or part of the protruding elements are strands distributed in the texture at a density of at least one strand per square millimeter (mm 2), each strand having a mean section of 0.003 mm2 and 1 mm2. [19] In another non-limiting embodiment, all or part of the protruding elements are slats substantially parallel to each other, the pitch of the slats in the texture being at most equal to 0.5 mm, each slat having an average width between 0.03 mm and 0.25 mm. [20] In another non-limiting embodiment, all or part of the protruding elements form side parallelepipeds between 0.05 mm and 0.5 mm, with a height of between 0.05 mm and 0.5 mm, the distance between two adjacent parallelepipeds in the texture being between 0.05 mm and 0.5 mm. [21] In another non-limiting embodiment, the protruding elements have in the form of shapes and distances between elements in variable protuberances. [22] This makes it possible to create randomness in the texture, which makes these elements less visible. [23] In a second nonlimiting embodiment, the recessed elements form openings on the running surface and the texture comprises a plurality of openings, said openings being distributed in the texture at a density at least equal to an opening. per square millimeter (mm 2), these openings having on the rolling surface equivalent diameters of between 0.03 mm and 1.2 mm. [24] The texture thus has a greater durability. Indeed, as this texture is composed of hollow elements relative to the surface of the tread, the impact of friction of a roadway on this texture is lower.
    [0003] BRIEF DESCRIPTION OF THE DRAWINGS [25] Other characteristics and advantages of the invention will emerge from the following description, given by way of example, without limitation, with reference to the appended drawings, in which: FIG. 1 schematically represents a view in perspective of a portion of a tire comprising a tread according to the prior art; - Figure 2 schematically shows a perspective view of a portion of a tire having a particular texture on the surface of the tread according to the invention; - Figure 3 shows a portion of the texture of Figure 2, according to a first non-limiting embodiment of a first embodiment of said texture according to which the texture has protruding elements; FIG. 4 represents part of the texture of FIG. 2, according to a second nonlimiting variant of a first embodiment of said texture according to which the texture has elements in protuberance; - Figure 5 shows a portion of the texture of Figure 2, according to a third non-limiting embodiment of a first embodiment of said texture according to which the texture has protruding elements; FIG. 6 represents part of the texture of FIG. 2, according to a fourth nonlimiting variant of a first embodiment of said texture according to which the texture has elements in protuberance; - Figure 7 shows a portion of the texture of Figure 2, according to a second embodiment of said texture according to which the texture has recessed elements; and FIG. 8 represents an enlarged view of a cavity of a recessed element of the texture of FIG. 7. [26] In the following description, substantially identical or similar elements will be designated by identical references. [27] Figure 1 shows a portion of the tire 1 having a tread 2 according to the prior art. As can be seen, the tread 2 has a tread surface 20 and grooves 21. Due to the laser sintering method used, the entire tread surface 20 has level 4 lines. [28] FIG. 2 represents a part of the tire 1 comprising a tread 2 according to the invention. The tread 2 comprises a tread surface 20 and grooves 21. The tread surface 20 has on at least 80% of its surface a texture 3 in contrast with the rest of the tire 1, in particular the sidewall of the tire 1. the illustrated example, the texture 3 extends over the entire running surface 20 and hides all the level lines 4. [29] According to a first non-limiting embodiment of the texture 3, the texture 3 comprises a plurality of elements in protuberance with respect to the rolling surface 20. The effect of these protruding elements is to "trap" a large quantity of the incident light rays that meet the texture 3. In this first embodiment the texture 3 (called "velvet") makes it possible to obtain, on the one hand, a "velvet" type visual because the protruding elements absorb the light and thus make the running surface 20 darker, and on the other hand a touch of ty pe "velvet", said protruding elements providing a rolling surface 20 pleasant to the touch. [30] Furthermore, according to a non-limiting embodiment, at least 30% of the protruding elements of the texture 3 makes an angle α greater than 40 ° relative to a tangent plane X to the running surface and at most 25% of the elements protruding from the texture makes an angle α less than 20 ° relative to the tangent plane X. On the zoomed portion of the texture 3 of Figure 2 are schematically illustrated the protruding elements, said tangent plane X and said angle a. It will be noted that the angle a is the angle between the tangent plane X and the side of the protruding elements. This variant applies for the protruding elements 6 and 7 described below. [31] Figure 3 illustrates the texture 3 according to a first non-limiting embodiment of the first embodiment. In this variant, all or part of the protruding elements are strands 6 distributed in the texture 3 in a density at least equal to one strand per square millimeter (mm 2), each strand having an average section S of between 0.003 mm 2 and 1 mm 2 . It should be noted that the average section of each strand corresponds to the average of sections S measured at regular intervals from the base of the strand. The strands 6 have a generally conical shape with a decreasing section in the Hb height of these strands. [32] Figure 4 illustrates the texture 3 according to a second non-limiting embodiment of the first embodiment. In this variant, all or part of the elements in protuberance are slats 7 substantially parallel to each other, the pitch P of the slats in the texture being between 0.1 mm and 0.5 mm, each slat 7 having an average width between 0.03 mm and 0.25 mm. It will be noted that the average width corresponds to the average of the widths 1 measured at regular intervals in the height H1 of the lamella, the height of each lamella being between 0.05 and 0.5 mm. [33] In another embodiment, the texture comprises a combination of strands 6 and slats 7. [34] Figure 5 illustrates the texture 3 according to a third non-limiting embodiment of the first embodiment. In this variant, all or part of the protruding elements form parallelepipeds 8 of side C between 0.05 mm and 0.5 mm, of height Hp between 0.05 mm and 0.5 mm, the distance Dp between two adjacent parallelepipeds 8 in the texture being between 0.05 mm and 0.5 mm.
    [0004] 1351 In another embodiment, the texture comprises a combination of the raised elements 6, 7 and 8, or 6 and 8, or 7 and 8 described above. [36] Figure 6 illustrates the texture 3 according to a fourth non-limiting embodiment of the first embodiment. In this variant, the protruding elements 9 have in the texture 3 shapes and distances between elements protruding variable. This variant makes it possible to make the protruding elements on the texture 3 less visible. [37] According to a second non-limiting embodiment of the texture 3, the texture 3 comprises a plurality of hollow elements 10 (also called holes) by relative to the running surface 20. The recessed elements 10 are composed of openings 11 on the running surface 20 and associated cavities 12 extending in the depth of the running surface 20. [38] Thus, the texture 3 comprises a plurality of openings 11 in the running surface 20, said openings 11 being distributed in the texture 3 in a density at least equal to one opening per square millimeter (mm 2) and having on the rolling surface diameters Dt equivalent between 0.03 mm and 1.2 mm. [39] In a nonlimiting embodiment, the openings 11 occupy at least 30% of the texture 3. According to other non-limiting embodiments, the openings 11 occupy at least 50% of the texture 3, or even more than 70%. It should be noted that the greater the degree of occupation of the openings on the texture, the better the masking of the level lines resulting from the molding process, and the better the contrast quality of this texture with respect to the rest of the tread. . [40] The openings 11 extend in the depth of the running surface 20 to form cavities 12. [41] The effect of these cavities 12 is to "trap" a large amount of the incident light rays that meet the texture. 3, but also to offer greater durability of the texture 3. Indeed, as the cavities 12 are recessed in the rolling surface 20, the impact of mechanical damage on the texture, such as friction of a pavement is weaker than for protuberances. In this second embodiment, the texture 3 (called "velvet") makes it possible to obtain a visual "velvet" type because the cavities absorb the light and thus make the tread 20 darker. [42] In a non-limiting embodiment, all or part of the cavities 12 has a depth of at least 0.1mm. In a non-limiting embodiment, all or part of the cavities 12 has a depth of between 0.2 mm and 0.6 mm. In this way, it is ensured that a large quantity of incident light rays which encounters the texture 3 is trapped by said texture and, since the depth of the cavities is limited, it is also avoided to degrade the mechanical strength of the surface of the surface too much. 20. [43] Figure 7 illustrates the texture 3 according to a first non-limiting variant of this second embodiment. In this variant, all or part of the cavities 12 are in the form of cones which extend in the depth of the running surface 20 and open on the rolling surface forming circular openings 11. The cavities 12 thus have a section which decreases in the depth of the tread surface 20. In this way, the contrast of the texture 3 and therefore of the tread surface 20 is improved with respect to the remainder of the tread 2. It should be noted that in this variant the openings 11 of the cavities 12 do not touch each other. The openings 11 are separated by intermediate zones 13. In addition, the openings 11 are evenly distributed over all or part of the running surface 20 so that the distance d between each opening of the texture is generally similar. [44] FIG. 8 is a zoom on a cavity 12 of a hollow element 10 of the texture of FIG. 7. In one nonlimiting embodiment, all or part of the cavities has at least one wall 14 which, according to FIG. a sectional view forms an angle p between 10 ° and 60 ° with respect to a direction Z perpendicular to the texture 3. [45] Whenever a light ray encounters a wall 14 of the cavity 12, this It is reflected by said wall 14. The direction of reflection of the light beam depends on the initial direction of this light ray and the angle of inclination of the wall 14. Thus, depending on this initial direction and this angle d tilt, the light beam can be returned to another wall 14 of the cavity. Conversely, the light ray can be returned outside the cavity, for example directly to an observer. In the first case, the light ray "gets lost" in the cavity and it will no longer be perceptible by the eye of an observer. In the second case, the observer can perceive the light beam and the texture may then appear to be lighter and therefore less contrasted with respect to the rest of the tread. By choosing a cavity 12 having at least one wall 14 which forms an angle R between 10 ° and 60 °, it is ensured that a large part of the light rays entering the cavity 12 will be absorbed by this cavity under the effect of multiple reflections inside the cavity. In this way, the contrast of the texture 3 (and therefore of the rolling surface 20) is improved with respect to the rest of the tire 1 (in particular with respect to the sidewall), while maintaining the same occupancy rate of the cavities in the texture. In addition, with this wall inclination, the texture strength is generally improved, especially during repeated friction with the roadway. [46] The invention is not limited to the examples described and shown and various modifications can be made without departing from its scope. [47] Thus, according to another non-limiting embodiment, the slats 7 of Figure 4 may be discontinuous. They have a flat part between them. In addition, they may have section differences between them. In addition, the slats may have curvatures or angles, especially in their length. They can also be of variable length. [48] Thus, according to another variant of non-limiting embodiment, the openings 11 may have the shape circular, square, or polygonal (for example hexagonal) and the corresponding cavities 12 in the form of cylinders, parallelepipeds, or polygons . With these two last structures (square or polygonal), it is possible to more easily organize the openings 11 relative to each other so as to limit the area of the intermediate zones 13 between these openings. With such forms of openings, it is possible to arrive more easily at substantial rates of occupancy of the openings. [49] Thus, the described invention has the following advantages in particular: the texture 3 makes it possible to mask the level lines on the running surface; the texture 3 (whether with elements in protuberance and / or with recessed elements) makes it possible at the same time to absorb the light and thus to give a black appearance to the running surface 20 with respect to the rest tread 2. This improves the contrast of the tread surface 20 with respect to the remainder of the tread; and - The texture 3 makes it possible to obtain a visual of the rolling surface 20 of the "velvet" type and / or a pleasant feel at the level of the tread 20 of the "velvet" type.
    权利要求:
    Claims (7)
    [0001]
    REVENDICATIONS1. A pneumatic tire (1) made of a rubber material comprising a tread (2), said tread having a tread surface (20) intended to come into contact with a road surface when the tire is rolling, said tread having a sectional view of a tread a certain curvature characterized in that the rolling surface (20) comprises on at least 80% of its surface a texture (3) in contrast with the rest of the tire, this texture (3) comprising a plurality of elements (6, 7, 8, 9, 10) in protrusion or recess relative to the running surface (20) and in that each member extends perpendicularly (0 = 90 °) to the running surface (20) along the curvature of this rolling surface (20).
    [0002]
    2. A tire (1) according to claim 1, characterized in that at least 30% of the elements (6, 7) protruding from the texture (3) makes an angle α greater than 40 ° with respect to a plane tangent to the running surface (20) and in that at most 25% of the protruding elements (6, 7) of the texture (3) makes an angle α less than 20 ° with respect to the tangent plane. 20
    [0003]
    3. Pneumatic tire (1) according to one of claims 1 or 2, characterized in that all or part of the protruding elements are strands (6) distributed in the texture (3) at a density of at least one strand per millimeter square (mm 2), each strand having a mean section of between 0.003 mm 2 and 1 mm 2. 25
    [0004]
    4. Tire (1) according to any one of claims 1 to 3, characterized in that all or part of the protruding elements are lamellae (7) substantially parallel to each other, the pitch of the lamellae in the texture (3) being at most equal to 0.5 mm, each lamella having an average width of between 0.03 mm and 0.25 mm. 30
    [0005]
    5. Tire (1) according to any one of claims 1 to 4, characterized in that all or part of the protruding elements form parallelepipeds (8) side (C) between 0.05 mm and 0.5 mm , of height (Hp) between 0.05 mm and 0.5 mm, the distance between two adjacent parallelepipeds (8) in the texture being between 0.05 mm and 0.5 mm.
    [0006]
    6. Pneumatic tire (1) according to any one of claims 1 to 5, characterized in that the protuberance elements (9) have in the texture (3) forms and distances between elements protruding variable.
    [0007]
    Pneumatic tire (1) according to claim 1, characterized in that the hollow elements (10) form openings (11) on the running surface (20) and the texture (3) comprises a plurality of openings (11). ), said openings (11) being distributed in the texture (3) in a density at least equal to one opening per square millimeter (mm2), these openings (11) having on the rolling surface (20) equivalent diameters (Dt ) between 0.03 mm and 1.2 mm.
    类似技术:
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    FR3018224A1|2015-09-11|PNEUMATIC COMPRISING A HIGH-CONTRAST TEXTURE ON THE BEARING SURFACE
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    EP2895338A1|2015-07-22|Tread and tyre for heavy vehicle
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    EP3030432B1|2020-07-01|Tyre comprising a particular graphic element
    FR3053920A1|2018-01-19|INSERT TEXTURE FOR FITTING A MOLD FOR THE VULCANIZATION OF A TIRE
    同族专利:
    公开号 | 公开日
    WO2015135930A1|2015-09-17|
    US10308076B2|2019-06-04|
    EP3116724A1|2017-01-18|
    BR112016019972B1|2020-12-08|
    CN106103138A|2016-11-09|
    US20170066288A1|2017-03-09|
    EP3116724B1|2019-11-20|
    BR112016019972A2|2018-05-08|
    JP2017507077A|2017-03-16|
    CN106103138B|2019-04-05|
    FR3018224B1|2017-11-17|
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    法律状态:
    2016-03-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-03-22| PLFP| Fee payment|Year of fee payment: 4 |
    2018-03-23| PLFP| Fee payment|Year of fee payment: 5 |
    2019-11-29| ST| Notification of lapse|Effective date: 20191106 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1451918A|FR3018224B1|2014-03-10|2014-03-10|PNEUMATIC COMPRISING A HIGH-CONTRAST TEXTURE ON THE BEARING SURFACE|FR1451918A| FR3018224B1|2014-03-10|2014-03-10|PNEUMATIC COMPRISING A HIGH-CONTRAST TEXTURE ON THE BEARING SURFACE|
    US15/122,454| US10308076B2|2014-03-10|2015-03-10|Tire including a high-contrast texture on the tread surface|
    EP15709157.0A| EP3116724B1|2014-03-10|2015-03-10|Tyre including a high-contrast texture on the tread surface|
    JP2016556303A| JP2017507077A|2014-03-10|2015-03-10|Tire with high contrast texture on tread surface|
    CN201580013030.9A| CN106103138B|2014-03-10|2015-03-10|Including the tire of high contrast texture in tread surface|
    BR112016019972-3A| BR112016019972B1|2014-03-10|2015-03-10|tire that has a high contrast texture on the tread|
    PCT/EP2015/054939| WO2015135930A1|2014-03-10|2015-03-10|Tyre including a high-contrast texture on the tread surface|
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