tire

Abstract

The present invention improves the appearance performance of a tire. A tire (1) has a decorative portion (10). The decorative portion (10) is provided on at least a portion of an outer surface (1a) that can be visually identified. The decorative portion (10) is provided at a distance of 1 mm. 2 The micro protrusions (11) are arranged at a density of 2 to 10. The micro protrusions (11) extend in a tapered shape toward the outside of the tire. The micro protrusions (11) include a first protrusion (12) and a second protrusion (13) having a larger taper angle than the first protrusion (12).

Description

Technical Field

[0001] The present disclosure relates to tires. Background Art

[0002] Patent document 1 below describes a tire having micro protrusions on a decorative part. The micro protrusions are provided with recesses at the top of the protrusions. The recesses reduce the reflection of the irradiated light, making the decorative part appear dark. Thus, the contrast with the non-decorative part adjacent to the decorative part is increased, thereby improving visibility.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2020-29209

[0004] In recent years, it has been desired to make the wavy irregularities, defects, and other irregularities formed on the outer surface of a tire less noticeable and to improve the appearance performance. Summary of the invention

[0005] The present disclosure has been made in view of the above-mentioned actual situation, and an object of the present invention is to provide a tire having improved appearance performance.

[0006] The present invention discloses a tire, wherein at least a portion of a visually recognizable outer surface of the tire has a decorative portion, wherein the decorative portion is 2 Two to ten micro-protrusions are arranged, the micro-protrusions extend in a tapered shape toward the outside of the tire, and the micro-protrusions include a first protrusion and a second protrusion having a larger taper angle than the first protrusion.

[0007] The tire of the present disclosure improves appearance performance by adopting the above structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a partial perspective view showing an embodiment of the tire of the present disclosure.

[0009] Figure 2 yes Figure 1 An enlarged view of the decorative part.

[0010] Figure 3 (a) is a cross-sectional view of the first protrusion, and (b) is a cross-sectional view of the second protrusion.

[0011] Figure 4 yes Figure 1 An enlarged front view of the decorative part.

[0012] Figure 5 It is an enlarged front view of a decorative portion according to another embodiment.

[0013] Figure 6 It is an enlarged front view of a decorative portion according to still another embodiment.

[0014] Figure 7This is an enlarged view of a decorative portion according to another embodiment.

[0015] Figure 8 yes Figure 7 FIG. 2 is a top view of the second protrusion of the embodiment shown in FIG.

[0016] Fig. 9 yes Figure 8 End view of line A-A.

[0017] Fig.10 This is an enlarged view of a decorative portion according to another embodiment.

[0018] Fig.11 (a) in Fig.10 A cross-sectional view of the first protrusion shown in FIG. Fig.10 A cross-sectional view of the second protrusion is shown in FIG.

[0019] Fig.12 It is a cross-sectional view of a second protrusion according to another embodiment.

[0020] Description of reference numerals:

[0021] 1: tire; 1a: outer surface; 10: decorative portion; 11: minute protrusion; 12: first protrusion; 13: second protrusion. DETAILED DESCRIPTION

[0022] Hereinafter, one embodiment of the present disclosure will be described based on the drawings.

[0023] Figure 1 1 is a perspective view showing one embodiment of the tire 1 of the present disclosure. Figure 1 In the embodiment, a pneumatic tire 1 for a passenger car is shown as a preferred embodiment. However, for example, the present disclosure can also be applied to a pneumatic tire 1 for a motorcycle, a heavy load, or other types of tires 1.

[0024] like Figure 1 As shown, the tire 1 of this embodiment has a visually identifiable outer surface 1a. The visually identifiable outer surface 1a refers to a surface that can be seen from the outside when the tire 1 is assembled on a rim (not shown). The outer surface 1a includes, for example, an outer surface 2a of the tread portion 2, an outer surface 3a of the sidewall portion 3, and an outer surface 4a of the bead portion 4. The outer surface 1a of this embodiment is formed black by carbon black.

[0025] In the present embodiment, the tire 1 has a decorative portion 10 on a portion of the outer surface 1a. The decorative portion 10 of the present embodiment is provided on the outer surface 3a of the sidewall portion 3. In addition, the decorative portion 10 is not limited to being provided on the outer surface 3a of the sidewall portion 3, and for example, may also be provided on the outer surface 2a of the tread portion 2 or the outer surface 4a of the bead portion 4.

[0026] In the present embodiment, the decorative portion 10 is formed in an arc shape with the tire rotation axis (not shown) as the center. The decorative portion 10 includes an outer edge 10e in the tire radial direction extending along the tire circumference and an inner edge 10i in the tire radial direction. The decorative portion 10 may also be provided in a plurality in the tire circumference. In addition, the decorative portion 10 is not limited to this method.

[0027] In this embodiment, the decorative portion 10 has a width of 1 mm. 2 There are 2 to 10 micro-protrusions 11. The micro-protrusions 11 extend, for example, in a cone shape toward the outside of the tire. Since such micro-protrusions 11 effectively capture incident light toward the decorative portion and have a high light absorption effect, the blackness of the decorative portion is improved. The number of micro-protrusions 11 is the number obtained by dividing 25 by the number of micro-protrusions 11 completely contained in a quadrilateral region with a side of 5 mm when the outer surface 1a is unfolded into a plane.

[0028] Figure 2 This is an enlarged view of the decoration department. Figure 3 (a) is a cross-sectional view of the first protrusion, and (b) is a cross-sectional view of the second protrusion. Figure 2 as well as Figure 3 As shown, the micro-protrusion 11 includes a first protrusion 12 and a second protrusion 13 having a larger cone angle than the first protrusion 12. The first protrusion 12 absorbs incident light and reflects it to the inside of the tire, so it has a high blackness. The second protrusion 13 can reflect the incident light to the outside of the tire, so that the blackness between it and the first protrusion 12 is uneven. Therefore, in the tire 1 of this embodiment, since the contrast between light and dark is generated in the decorative portion 10, it has excellent appearance performance. In addition, the contrast between light and dark, for example, when wavy bumps are generated in the sidewall portion 3, they are not noticeable, thereby further improving the appearance performance.

[0029] If the taper angle α1 of the first protrusion 12 is small, there is a concern that rubber defects and the like are likely to occur, and the appearance performance is deteriorated. If the taper angle α1 of the first protrusion 12 is large, there is a concern that the incident light becomes easily reflected to the outer side of the tire. Therefore, the taper angle α1 is preferably 10 degrees or more, more preferably 20 degrees or more, more preferably 30 degrees or more, preferably 100 degrees or less, more preferably 90 degrees or less, and more preferably 80 degrees or less.

[0030] If the taper angle α2 of the second protrusion 13 is small, there is a concern that the contrast (difference between light and dark) with the first protrusion 12 will decrease. If the taper angle α2 of the second protrusion 13 is large, there is a concern that the incident light is excessively reflected toward the outside of the tire and the blackness of the decorative portion 10 will decrease. Therefore, the taper angle α2 is preferably 30 degrees or more, more preferably 40 degrees or more, further preferably 50 degrees or more, preferably 120 degrees or less, more preferably 110 degrees or less, and further preferably 100 degrees or less.

[0031] The difference (α2-α1) between the taper angle α1 of the first protrusion 12 and the taper angle α2 of the second protrusion 13 is preferably 10 to 90 degrees. This improves blackness and sharpens contrast. To effectively exert this effect, the difference (α2-α1) is more preferably 30 degrees or more, and more preferably 60 degrees or less.

[0032] The protrusion height h1 of the first protrusion 12 is preferably higher than the protrusion height h2 of the second protrusion 13. As a result, the incident light reflected by the second protrusion 13 toward the outside of the tire hits the first protrusion 12 and is absorbed, so the blackness is further improved. In the case where the protrusion height h1 of the first protrusion 12 is excessively greater than the protrusion height h2 of the second protrusion 13, there is a concern that the first protrusion 12 is too conspicuous and the appearance performance is deteriorated. Therefore, the protrusion height h1 of the first protrusion 12 is preferably 1.4 times or more of the protrusion height h2 of the second protrusion 13, more preferably 2.0 times or more, more preferably 2.5 times or more, preferably 5.0 times or less, more preferably 4.5 times or less, and more preferably 4.0 times or less. In order to effectively play this role, the protrusion height h1 of the first protrusion 12 is preferably 0.1 mm or more, more preferably 0.2 mm or more, more preferably 0.3 mm or more, preferably 0.8 mm or less, more preferably 0.7 mm or less, and more preferably 0.6 mm or less.

[0033] In the present embodiment, the micro-protrusion 11 includes a protrusion base 14 extending in a tapered manner toward the outside of the tire, and a protrusion top 15 connected to the protrusion base 14 and extending toward the outside of the tire at a slope slower than that of the protrusion base 14. In the present embodiment, the protrusion base 14 includes an inclined surface 14a formed by a straight line in the longitudinal section of the micro-protrusion 11. The protrusion base 14 may, for example, include a surface formed by an arc protruding toward the outside of the tire, or may include a surface formed by an arc recessed toward the inside of the tire (not shown). In this specification, the taper angle α1 of the first protrusion 12 and the taper angle α2 of the second protrusion 13 are average angles in the protrusion base 14. The protrusion top 15 is a portion formed by a taper angle exceeding 120 degrees.

[0034] The protrusion base 14 of any of the first protrusion 12 and the second protrusion 13 is formed in a truncated cone shape. Such a protrusion base 14 reflects and absorbs incident light in multiple directions toward the outside of the tire. The so-called truncated cone shape includes not only a truncated cone with a circular bottom surface, but also a truncated cone with an elliptical bottom surface. In addition, each protrusion base 14 is not limited to this type, and can also be a truncated pyramid, for example.

[0035] The protrusion top 15A of the first protrusion 12 is flat. Such a protrusion top 15A reflects incident light toward the outside of the tire. Therefore, the unevenness of the blackness is further improved, so the appearance performance is improved. The protrusion top 15A of the first protrusion 12 is a circular plane. The protrusion top 15A can be formed as a whole by a plane. Alternatively, the protrusion top 15A can also include a plane and a curved surface surrounding the periphery of the plane in order to smoothly connect the plane to the protrusion base 14.

[0036] The protrusion top 15B of the second protrusion 13 is hemispherical and convex to the outside of the tire. Such a protrusion top 15B can scatter the incident light and illuminate the first protrusion 12. Since the incident light irradiating the first protrusion 12 is absorbed by the first protrusion 12, the blackness of the decorative portion 10 is improved. Therefore, the appearance performance is further improved. In this specification, the hemispherical shape naturally includes a shape obtained by dividing the plane passing through the center of the ball into two halves, but also includes a shape obtained by dividing the plane passing through a position other than the center of the ball into two halves.

[0037] The maximum diameter d1 of the protrusion top 15A of the first protrusion 12 is preferably the same as the maximum diameter d2 of the protrusion top 15B of the second protrusion 13. Thus, the difference between the amount of light reflected by the protrusion top 15A of the first protrusion 12 and the amount of light reflected by the protrusion top 15B of the second protrusion 13 is small, and the contrast between light and dark is maintained high.

[0038] The maximum diameter d1 of the protrusion top 15A of the first protrusion 12 and the maximum diameter d2 of the protrusion top 15B of the second protrusion 13 are preferably 0.05 mm or more, more preferably 0.1 mm or more, preferably 0.4 mm or less, more preferably 0.3 mm or less. Since the maximum diameter d1 and the maximum diameter d2 are 0.05 mm or more, it is possible to reduce the unevenness of the blackness caused by the reflected light of each protrusion top 15. Since the maximum diameter d1 and the maximum diameter d2 are 0.4 mm or less, it is possible to ensure the blackness.

[0039] The maximum diameter D1 of the first protrusion 12 is preferably smaller than the maximum diameter D2 of the second protrusion 13. This increases the area of ​​the protrusion base 14 of the second protrusion 13 and improves the unevenness of blackness. The maximum diameters D1 and D2 are formed at the innermost position of each protrusion 12 and 13 in the tire.

[0040] If the maximum diameter D1 of the first protrusion 12 is excessively smaller than the maximum diameter D2 of the second protrusion 13, there is a concern that the blackness will decrease. Therefore, the ratio (D2 / D1) of the maximum diameter D1 of the first protrusion 12 to the maximum diameter D2 of the second protrusion 13 is preferably 1.1 times or more, more preferably 1.2 times or more, preferably 2.0 times or less, and more preferably 1.7 times or less.

[0041] Figure 41 is an enlarged front view of the decorative portion 10. Figure 4 As shown, the decorative portion 10 of the present embodiment includes a first protrusion group 12R in which first protrusions 12 are continuously arranged. The first protrusion group 12R improves blackness because light reflected by a first protrusion 12 is irradiated to and absorbed by first protrusions 12 adjacent to the first protrusion 12 .

[0042] In the present embodiment, the decorative portion 10 includes a second protrusion group 13R in which the second protrusions 13 are continuously arranged. The second protrusion group 13R increases the non-uniformity of blackness due to the adjacent second protrusions 13 .

[0043] In the decorative portion 10, for example, the first protrusion group 12R and the second protrusion group 13R are arranged alternately. This enhances the above-mentioned effect, thereby emphasizing the contrast between light and dark, and further exerting the effect of not making the wavy unevenness or the like conspicuous. In the present embodiment, the first protrusion group 12R and the second protrusion group 13R are arranged alternately in the tire circumferential direction.

[0044] The angle θ1 of the arrangement direction of the first protrusion group 12R relative to the tire radial direction is preferably 30 degrees or more, more preferably 35 degrees or more, more preferably 40 degrees or more, preferably 60 degrees or less, more preferably 55 degrees or less, and more preferably 50 degrees or less. Since the angle θ1 of the first protrusion group 12R is 30 degrees or more and 60 degrees or less, the visibility of the decorative portion 10 is improved, and the appearance performance can be improved. From the same point of view, the angle θ2 of the arrangement direction of the second protrusion group 13R relative to the tire radial direction is preferably 30 degrees or more, more preferably 35 degrees or more, more preferably 40 degrees or more, preferably 60 degrees or less, more preferably 55 degrees or less, and more preferably 50 degrees or less. The angle θ1 of the first protrusion group 12R and the angle θ2 of the second protrusion group 13R are preferably the same. The angle θ1 of the first protrusion group 12R and the angle θ2 of the second protrusion group 13R are the angles at the middle position 10c in the tire radial direction between the outer edge 10e and the inner edge 10i of the decorative portion 10.

[0045] In the present embodiment, the total number of the first protrusions 12 is formed to be greater than the total number of the second protrusions 13. Thus, the effect of improving the blackness brought by the first protrusions 12 is greatly exerted. If the total number of the first protrusions 12 is excessively greater than the total number of the second protrusions 13, there is a concern that the unevenness of the blackness is reduced. Therefore, the total number of the first protrusions 12 is preferably 1.2 times or more of the second protrusions 13, more preferably 1.4 times or more, further preferably 1.6 times or more, preferably 2.5 times or less, more preferably 2.2 times or less, and further preferably 2.0 times or less.

[0046] like Figure 2As shown, the arrangement pitch p1 of the first protrusions 12 and the maximum diameter D1 ( Figure 3 The ratio (p1 / D1) is preferably 1.05 or more, more preferably 1.15 or more, and is preferably 1.40 or less, more preferably 1.30 or less.

[0047] The ratio (p2 / D2) of the arrangement pitch p2 of the second protrusions 13 to the maximum diameter D2 of the second protrusions 13 is preferably greater than the ratio (p1 / D1) of the first protrusions 12. Since the effect of improving the blackness and the effect of exerting the unevenness of the blackness are balanced, the wavy concave and convex can be made less conspicuous. From this point of view, the ratio (p2 / D2) of the second protrusions 13 is preferably greater than 1.35, more preferably greater than 1.45, preferably less than 1.65, and more preferably less than 1.55.

[0048] The arrangement pitch P between the first protrusion group 12R and the second protrusion group 13R adjacent thereto is preferably 1.6 times or more, more preferably 1.7 times or more, preferably 2.0 times or less, more preferably 1.9 times or less of the maximum diameter D1 of the first protrusion 12. Since the arrangement pitch P is 1.6 times or more of the maximum diameter D1 of the first protrusion, the unevenness of light and dark caused by the protrusion tops 15A and 15B of each protrusion 12 and 13 can be clearly visually recognized, so the contrast is emphasized. Since the arrangement pitch P is 2.0 times or less of the maximum diameter D1 of the first protrusion, the light reflected by the second protrusion 13 is effectively absorbed by the first protrusion 12.

[0049] Figure 5 2 is an enlarged view of a decorative part of another embodiment. The same components as those of this embodiment are denoted by the same reference numerals and their detailed description is omitted. Figure 5 As shown, in this embodiment, the decorative part 10 is formed so that a plurality of second protrusions 13 surround a plurality of first protrusions 12. The decorative part 10 is formed so that six second protrusions 13 surround three first protrusions 12, for example.

[0050] Figure 6 FIG. 2 is an enlarged view of a decoration part of another embodiment. The same components as those of the present embodiment are denoted by the same reference numerals and their detailed description is omitted. Figure 6 As shown, in this embodiment, the decorative part 10 is formed so that a plurality of first protrusions 12 surround one second protrusion 13. The decorative part 10 is formed so that, for example, twelve first protrusions 12 surround one second protrusion 13.

[0051] Hereinafter, another embodiment of the present disclosure will be described. In the following figures, the same components as those of the above-described embodiment are denoted by the same reference numerals and their detailed description is omitted. The above-described matters can be applied to the components whose description is omitted.

[0052] Figure 7 FIG. 1 is an enlarged view of the decorative portion 10 of another embodiment. Figure 7 As shown, in this embodiment, the first protrusion 12 is substantially the same as that described above. On the other hand, the second protrusion 13 has a different structure from that described above.

[0053] Figure 8 Indicates looking down Figure 7 The second protrusion 13 of the illustrated embodiment is shown in a top view. Fig. 9 express Figure 8 A-A line end view. Figure 8 as well as Fig. 9 As shown, the second protrusion 13 of this embodiment includes a protrusion base 14 extending in a cone shape toward the outside of the tire. In addition, the protrusion base 14 includes an inclined surface 14a that defines a cone angle, and at least one protrusion 20 that protrudes from the inclined surface 14a. The second protrusion 13 including such a protrusion 20 can scatter the incident light more complexly, and it is also expected to absorb the scattered light. Therefore, the blackness of the second protrusion 13 is improved, and the contrast between light and dark with the first protrusion 12 can be further increased. In addition, in order to facilitate the understanding of the structure, Figure 8 The raised portion 20 is applied at a point.

[0054] like Figure 8 As shown, the second protrusion 13 of this embodiment includes a plurality of raised portions 20. The number of raised portions 20 included in one second protrusion 13 is, for example, 2 to 6, preferably 2 to 4. In a more preferred embodiment, when viewed from above, the bottom edge 22 of the second protrusion 13 is circular, and the plurality of raised portions 20 are arranged at equal intervals along the circumferential direction of the bottom edge 22. As a result, the blackness of the second protrusion 13 is further improved.

[0055] The raised portion 20 is preferably arranged along the generatrix 17 (for ease of understanding) of the inclined surface 14a. Figure 8 In other words, the length L1 of the protrusion 20 in the above-mentioned busbar direction is longer than the length L2 of the protrusion 20 in the above-mentioned circumferential direction. Specifically, the above-mentioned length L1 is 1.5 to 3.5 times the above-mentioned length L2. In a more preferred embodiment, the second protrusion 13 includes a protrusion base 14 including an inclined surface 14a extending in a conical shape, and a hemispherical protrusion top 15 protruding toward the outside of the tire, and the protrusion 20 extends from the boundary 16 (for ease of understanding, at the boundary 16) between the protrusion base 14 and the protrusion top 15. Figure 8The first protrusion 12 and the second protrusion 13 are shown by a two-dot chain line (shown in FIG. 1 ), and the second protrusion 13 is extended to the bottom edge 22. As a result, the contrast between the light and dark of the first protrusion 12 and the second protrusion 13 is further increased, and the appearance performance is further improved.

[0056] like Fig. 9 As shown, in the longitudinal section of the second protrusion 13 passing through the protrusion 20, the outer surface 20s of the protrusion 20 is preferably curved in an arc shape so as to convexly extend toward the outer side of the tire. For example, the curvature radius r1 of the outer surface 20s of the protrusion 20 is preferably 80% to 120% of the height h3 from the bottom edge 22 of the second protrusion 13 to the boundary 16 between the protrusion base 14 and the protrusion top 15. Thus, it is possible to suppress the molding failure of the protrusion 20 during vulcanization molding, and the above-mentioned effect can be exerted.

[0057] From the same viewpoint, the maximum height h4 from the inclined surface 14 a to the outer surface of the raised portion 20 in the longitudinal section is preferably 20% to 30% of the protrusion height h2 of the second protrusion 13 .

[0058] Fig.10 FIG. 1 is an enlarged view of the decorative portion 10 according to another embodiment. Fig.10 As shown, the microprotrusion 11 of this embodiment includes an annular bottom edge 22, the area of ​​the region surrounded by the bottom edge 22 when viewed from above, that is, the bottom area, the vertex 24 at the farthest position from the bottom edge 22, and the protrusion height from the bottom edge 22 to the vertex 24. In addition, the microprotrusion 11 includes a first protrusion 12 and a second protrusion 13.

[0059] Fig.11 (a) means in Fig.10 2 is a cross-sectional view of the first protrusion 12 of the embodiment shown in FIG. Fig.11 (b) in the above means Fig.10 13 is a cross-sectional view of the second protrusion 13 of the embodiment shown in FIG. Fig.11 As shown in (a) and (b) in FIG. 1 , in this embodiment, the bottom area of ​​the second protrusion 13 is larger than the bottom area of ​​the first protrusion 12. In addition, the protrusion height h2 of the second protrusion 13 is smaller than the protrusion height h1 of the first protrusion 12. The decorative portion 10 including the first protrusion 12 and the second protrusion 13 has excellent appearance performance due to the contrast between light and dark.

[0060] From the viewpoint of suppressing molding defects during vulcanization and increasing the above contrast, the protrusion height h1 of the first protrusion 12 is preferably 1.4 times or more, more preferably 2.0 times or more, more preferably 2.5 times or more, preferably 5.0 times or less, more preferably 4.5 times or less, and more preferably 4.0 times or less of the protrusion height h2 of the second protrusion 13. In addition, the bottom area of ​​the second protrusion 13 is preferably 1.1 times or more, more preferably 1.3 times or more, preferably 2.5 times or less, and more preferably 2.2 times or less of the bottom area of ​​the first protrusion 12.

[0061] In this embodiment, the first protrusion 12 is substantially the same as that described above. On the other hand, the second protrusion 13 has a different structure from that described above.

[0062] like Fig.10 As shown, the second protrusion 13 of this embodiment includes a protrusion base 14 extending from the bottom edge 22 to the outside of the tire and having a dome-shaped outer surface, and a protrusion top 15 further protruding from the protrusion base 14. Such a second protrusion 13 can further improve the contrast between light and dark with the first protrusion 12, thereby further improving the appearance performance. In addition, the dome-shaped outer surface is a surface that is convexly curved toward the outside of the tire.

[0063] like Fig.11 As shown in (b), for example, the height h3 of the protrusion base 14 of the second protrusion 13 is preferably 65% ​​to 85% of the protrusion height h2 of the second protrusion 13. In addition, the outer surface of the protrusion base 14 of the second protrusion 13 of this embodiment is curved into an arc shape convex to the outside of the tire in the longitudinal section passing through the vertex of the second protrusion 13. In addition, for example, the curvature radius r2 of the outer surface of the protrusion base 14 in the above longitudinal section is preferably 100% to 150% of the height h3 of the protrusion base 14 and is less than 1.0 mm. Such a second protrusion 13 can suppress poor forming during vulcanization and improve blackness.

[0064] The protrusion top 15 of the second protrusion 13 preferably has a dome-shaped outer surface that protrudes further from the protrusion base 14, for example. As a result, the outer surface 15a of the protrusion top 15 of the second protrusion 13 is curved into an arc shape that protrudes toward the outside of the tire in the above-mentioned longitudinal section. In addition, the curvature radius r3 of the outer surface 15a of the protrusion top 15 of the second protrusion 13 is smaller than the curvature radius r2 of the protrusion base 14. Specifically, the curvature radius r3 is 30% to 60% of the curvature radius r2. In addition, the height h5 of the protrusion top 15 is, for example, 20% to 30% of the protrusion height h2 of the second protrusion 13. As a result, the blackness of the second protrusion 13 is further improved.

[0065] The structure of the second protrusion 13 is not limited to the above-described embodiment. For example, the second protrusion 13 may be such that the protrusion top 15 disposed on the dome-shaped protrusion base 14 is substantially formed in a flat shape (not shown).

[0066] Fig.12 FIG. 4 is a cross-sectional view showing another embodiment of the second protrusion 13. Fig.12 As shown, the second protrusion 13 may be configured as a dome as a whole. This can suppress molding defects during vulcanization and the above-mentioned effects can be expected.

[0067] exist Figure 7 as well as Fig.10 The decorative portion 10 of the embodiment shown in each of the figures includes a first protrusion group 12R in which the first protrusions 12 are arranged, and a second protrusion group 13R in which the second protrusions 13 are continuously arranged. The first protrusion group 12R and the second protrusion group 13R are alternately arranged in the tire circumferential direction, for example.

[0068] exist Figure 7 or Fig.10 The first protrusion 12 and the second protrusion 13 shown in the figure can be configured in various ways, for example, Figures 5-6 That is, it is also possible to configure Figure 7 or Fig.10 In the decorative portion 10 of the first protrusion 12 and the second protrusion 13 shown in FIG. Figure 5 As shown in FIG. 1 , the plurality of second protrusions 13 surround the plurality of first protrusions 12. Figure 7 or Fig.10 In the decorative portion 10 of the first protrusion 12 and the second protrusion 13 shown in FIG. Figure 6 As shown, the plurality of first protrusions 12 surround one second protrusion 13. With such a decorative portion 10, further improvement in appearance performance can be expected.

[0069] As mentioned above, although the particularly preferred embodiment of the present disclosure was described in detail, the present disclosure is not limited to the illustrated embodiment, and can be implemented in various modified forms.

[0070] [Example]

[0071] In order to confirm the effect of the present disclosure, a prototype was produced with the outer surface of the sidewall having the following Figure 1 as well as Figure 2 The pneumatic tires with the decorative parts shown in the figure were tested for the appearance performance of each trial tire. The specifications other than those listed in Table 1 were substantially the same for the comparative examples and the embodiments.

[0072] Maximum diameter of the first protrusion D1: 0.4mm

[0073] Height h1 of the first protrusion: 0.4 mm

[0074] Arrangement pitch p1 of the first protrusions: 0.5 mm

[0075] Second protrusion arrangement pitch p2: 0.7 mm

[0076] The spacing P between the first protrusion group and the second protrusion group: 0.9 mm

[0077] Angles θ1 and θ2 of the arrangement direction: 45 degrees

[0078] <Appearance and performance>

[0079] The inspector visually observed the trial tire from the side at a distance of 1m, and evaluated the appearance performance by sensory evaluation based on the conspicuity of the wavy bumps and the like due to the contrast of the decorative part. The results are expressed on a 10-point scale according to Example 1. The larger the value, the less conspicuous the wavy bumps and the like are, and the better the appearance performance is.

[0080] The test results are shown in Table 1.

[0081]

Table 1

[0082]

[0083] It can be understood that the tire of the embodiment is superior to the tire of the comparative example in appearance performance.

[0084] The outer surface of the tire sidewall has a Figure 7 or Fig.10 A pneumatic tire with the decorative portion shown in FIG. 1 was provided and the above-mentioned appearance performance was tested.

[0085] The test results are shown in Table 2.

[0086]

Table 2

[0087]

[0088] As shown in Table 2, for Figure 7 as well as Fig.10 The embodiment shown in Figure 2 The same as the embodiment shown in , it can also be confirmed that the appearance performance is excellent.

[0089] [Notes]

[0090] The present disclosure includes the following aspects.

[0091] [Present Disclosure 1]

[0092] A tire, wherein

[0093] The tire has a decorative portion on at least a portion of a visually identifiable outer surface thereof.

[0094] The above decorative part is every 1mm 2 There are 2 to 10 tiny protrusions.

[0095] The micro-protrusions extend in a tapered shape toward the outside of the tire.

[0096] The microprotrusions include a first protrusion and a second protrusion having a larger taper angle than the first protrusion.

[0097] [Present Disclosure 2]

[0098] In the tire described in Present Disclosure 1, a protrusion height of the first protrusion is higher than a protrusion height of the second protrusion.

[0099] [Present Disclosure 3]

[0100] In the tire described in Present Disclosure 1 or 2, a difference between the taper angle of the first protrusion and the taper angle of the second protrusion is 10 to 90 degrees.

[0101] [Present Disclosure 4]

[0102] In the tire described in any one of Present Disclosures 1 to 3, the decorative portion includes a first protrusion group in which the first protrusions are continuously arranged.

[0103] [Present Disclosure 5]

[0104] In the tire described in the present disclosure 4, the angle of the arrangement direction of the first protrusion group with respect to the tire radial direction is 30 to 60 degrees.

[0105] [Present Disclosure 6]

[0106] In the tire described in any one of Present Disclosures 1 to 5, the decorative portion includes a second protrusion group in which the second protrusions are continuously arranged.

[0107] [Present Disclosure 7]

[0108] In the tire described in any one of Present Disclosures 1 to 6, the protrusion tops of the first protrusions are flat.

[0109] [Present Disclosure 8]

[0110] In the tire according to any one of Present Disclosures 1 to 7, the second protrusions have a protrusion top that is hemispherical and convex toward the outside of the tire.

[0111] [Present Disclosure 9]

[0112] In the tire described in any one of Present Disclosures 1 to 8, the total number of the first protrusions is 1.2 to 2.5 times the total number of the second protrusions.

[0113] [Present Disclosure 10]

[0114] In the tire described in any one of Disclosures 1 to 9,

[0115] The micro-protrusions include a protrusion base extending in a tapered shape toward the outside of the tire.

[0116] The protrusion base of the second protrusion includes an inclined surface defining the taper angle and at least one protruding portion protruding from the inclined surface.

[0117] [Present Disclosure 11]

[0118] In the tire described in Present Disclosure 10, the second protrusion includes a plurality of the raised portions.

[0119] [Present Disclosure 12]

[0120] In the tire according to the present disclosure 10 or 11, the raised portion extends long along a generatrix of the inclined surface.

[0121] [Present Disclosure 13]

[0122] A tire, wherein

[0123] The tire has a decorative portion on at least a portion of a visually identifiable outer surface thereof.

[0124] The above decorative part is every 1mm 2 There are 2 to 10 tiny protrusions.

[0125] The micro-protrusion includes an annular bottom edge, an area of ​​a region enclosed by the bottom edge when viewed from above, i.e., a bottom area, a vertex at a position farthest from the bottom edge, and a protrusion height from the bottom edge to the vertex.

[0126] The micro protrusions include a first protrusion and a second protrusion.

[0127] The bottom area of ​​the second protrusion is larger than the bottom area of ​​the first protrusion.

[0128] The protrusion height of the second protrusion is smaller than the protrusion height of the first protrusion.

[0129] [Present Disclosure 14]

[0130] In the tire described in the present disclosure 13,

[0131] The first protrusion extends in a tapered shape toward the outside of the tire.

[0132] The second protrusion includes a protrusion base portion extending from the bottom edge toward the outside of the tire and having a dome-shaped outer surface, and a protrusion top portion further protruding from the protrusion base portion.

[0133] [Present Disclosure 15]

[0134] In the tire described in the present disclosure 13,

[0135] The first protrusion extends in a tapered shape toward the outside of the tire.

[0136] The second protrusion is configured in a dome shape as a whole.

[0137] [Present Disclosure 16]

[0138] In the tire described in any one of Disclosures 13 to 15,

[0139] The decorative portion includes a first protrusion group in which the first protrusions are continuously arranged, and a second protrusion group in which the second protrusions are continuously arranged.

[0140] [Present Disclosure 17]

[0141] In the tire described in Present Disclosure 16, the first protrusion group and the second protrusion group are alternately arranged in the tire circumferential direction.

[0142] [Present Disclosure 18]

[0143] In the tire described in any one of Present Disclosures 13 to 15, the decorative portion is formed such that a plurality of the first protrusions surround one of the second protrusions.

[0144] [Present Disclosure 19]

[0145] In the tire described in any one of Present Disclosures 13 to 18, the bottom area of ​​the second protrusion is 1.1 to 2.5 times the bottom area of ​​the first protrusion.

[0146] [Present Disclosure 20]

[0147] In the tire described in any one of Present Disclosures 13 to 19, the protrusion height of the first protrusion is 1.4 to 5.0 times the protrusion height of the second protrusion.

Claims

1. A tire, wherein: The tire has a decorative portion on at least a portion of a visually identifiable outer surface thereof, The decorative part is arranged at every 1 mm 2 There are 2 to 10 tiny protrusions. The micro protrusions extend in a cone shape toward the outside of the tire. The micro protrusions include a first protrusion and a second protrusion having a larger taper angle than the first protrusion. The protrusion top of the first protrusion is flat. The protrusion top of the second protrusion is in a hemispherical shape protruding toward the outside of the tire.

2. The tire according to claim 1, wherein: A protrusion height of the first protrusion is higher than a protrusion height of the second protrusion.

3. The tire according to claim 1 or 2, wherein: A difference between the taper angle of the first protrusion and the taper angle of the second protrusion is 10 to 90 degrees.

4. The tire according to claim 1 or 2, wherein: The decorative portion includes a first protrusion group formed by continuously arranging the first protrusions.

5. The tire according to claim 4, wherein: The angle of the arrangement direction of the first protrusion group with respect to the tire radial direction is 30 to 60 degrees.

6. The tire according to claim 1 or 2, wherein: The decorative portion includes a second protrusion group formed by continuously arranging the second protrusions.

7. The tire according to claim 1 or 2, wherein: The total number of the first protrusions is 1.2 to 2.5 times the total number of the second protrusions.

8. The tire according to claim 1 or 2, wherein: The micro-protrusion includes a protrusion base extending in a tapered shape toward the outside of the tire. The protrusion base of the second protrusion includes an inclined surface defining the taper angle, and at least one protrusion protruding from the inclined surface.

9. The tire according to claim 8, wherein: The second protrusion includes a plurality of the protrusions.

10. The tire according to claim 8, wherein: The raised portion extends long along a generatrix of the inclined surface.

11. A tire, wherein: The tire has a decorative portion on at least a portion of a visually identifiable outer surface thereof, The decorative part is arranged at every 1 mm 2 There are 2 to 10 tiny protrusions. The micro-protrusion includes an annular bottom edge, an area of ​​a region surrounded by the bottom edge when viewed from above, i.e., a bottom area, a vertex at a position farthest from the bottom edge, and a protrusion height from the bottom edge to the vertex. The micro protrusions include a first protrusion and a second protrusion, The bottom area of ​​the second protrusion is larger than the bottom area of ​​the first protrusion, The protrusion height of the second protrusion is smaller than the protrusion height of the first protrusion, The protrusion top of the first protrusion is flat. The protrusion top of the second protrusion is in a hemispherical shape protruding toward the outside of the tire.

12. The tire according to claim 11, wherein: The first protrusion extends toward the outside of the tire in a tapered shape. The second protrusion includes a protrusion base portion extending from the bottom edge toward the outside of the tire and having a dome-shaped outer surface, and a protrusion top portion further protruding from the protrusion base portion.

13. The tire according to claim 11, wherein: The first protrusion extends toward the outside of the tire in a tapered shape. The second protrusion is configured as a dome as a whole.

14. The tire according to any one of claims 11 to 13, wherein: The decorative portion includes a first protrusion group in which the first protrusions are continuously arranged, and a second protrusion group in which the second protrusions are continuously arranged.

15. The tire according to claim 14, wherein: The first protrusion group and the second protrusion group are alternately arranged in the tire circumferential direction.

16. The tire according to any one of claims 11 to 13, wherein: The decorative portion is formed such that a plurality of the first protrusions surround one second protrusion.

17. The tire according to any one of claims 11 to 13, wherein: The bottom area of ​​the second protrusion is 1.1 to 2.5 times the bottom area of ​​the first protrusion.

18. The tire according to any one of claims 11 to 13, wherein: The protrusion height of the first protrusion is 1.4 to 5.0 times the protrusion height of the second protrusion.

19. The tire according to claim 11, wherein: The micro protrusions extend in a cone shape toward the outside of the tire. A taper angle of the second protrusion is greater than a taper angle of the first protrusion.

20. The tire according to claim 19, wherein: The micro-protrusion includes a protrusion base extending in a tapered shape toward the outside of the tire. The protrusion base of the second protrusion includes an inclined surface defining the taper angle, and at least one protrusion protruding from the inclined surface.

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