JP2021142858A - tire - Google Patents

Abstract

To provide a tire of which external appearance can be improved by a decorative part.SOLUTION: A tire 1 has a decorative part 5 on at least a part of an external surface 1a that can be visually confirmed. A plurality of micro projections 6 projecting from the external surface 1a are arranged on the decorative part 5. The micro projection 6 includes at least one first projection 6A. The first projection 6A includes a first recess 7A, and a first outer wall part 8A which surrounds a circumference of the first recess 7A, and forms a first apex 8a. The first outer wall part 8A extends from the external surface 1a in a direction inclined with respect to a normal direction N of the external surface 1a.SELECTED DRAWING: Figure 2

Description

The present invention relates to a tire having a decorative portion on at least a part of a visible outer surface.

Conventionally, tires having a decorative portion on at least a part of a visible outer surface have been known. For example, Patent Document 1 below proposes a pneumatic tire having a decorative pattern composed of two or more types of ridges having different cross-sectional shapes.

Japanese Unexamined Patent Publication No. 2014-061820

However, in recent years, there has been a demand for a tire having an improved contrast in a decorative portion to further improve the appearance, and further improvement has been expected for the tire of Patent Document 1.

The present invention has been devised in view of the above circumstances, and a main object of the present invention is to provide a tire capable of improving the appearance by a decorative portion.

The present invention is a tire, which has a decorative portion on at least a part of a visible outer surface, and a plurality of microprojections protruding from the outer surface are arranged on the decorative portion. Includes at least one first protrusion, the first protrusion comprising a first recess and a first outer wall portion surrounding the first recess to form a first top, said first outer wall portion. Is characterized in that it extends from the outer surface in a direction inclined with respect to the normal direction of the outer surface.

In the tire of the present invention, the first outer wall portion has a first longitudinal sectional contour orthogonal to the outer surface, and at least one of the first longitudinal sectional contours extends from the outer surface to the first top portion. The pair of first wall contour lines includes a pair of first wall contour lines, and the pair of the first wall contour lines have a first angle θ1 with respect to the outer surface of one of the first wall contour lines at a position intermediate in the normal direction. However, it is desirable that the contour line of the other first wall portion is smaller than the second angle θ2 with respect to the outer surface.

In the tire of the present invention, it is desirable that the first angle θ1 is 45 ° or more.

In the tire of the present invention, it is desirable that the first angle θ1 is less than 90 °.

In the tire of the present invention, it is desirable that the sum (θ1 + θ2) of the first angle θ1 and the second angle θ2 is 180 ° or more.

In the tire of the present invention, the microprotrusion further includes at least one second protrusion, and the second protrusion surrounds the second recess and the circumference of the second recess to form a second top. It is desirable that the second outer wall portion, including the portion, extends from the outer surface in the normal direction.

In the tire of the present invention, the second outer wall portion has a second vertical cross-sectional contour orthogonal to the outer surface, and the second vertical cross-sectional contour extends from the outer surface to the second top. The pair of second wall contour lines, including the wall contour line, have a third angle θ3 with respect to the outer surface of one of the second wall contour lines at a position intermediate in the normal direction, while the other. It is desirable that the contour line of the second wall portion is equal to the fourth angle θ4 with respect to the outer surface.

In the tire of the present invention, it is desirable that the first outer wall portion includes at least two peak portions having a large protrusion height in the normal direction and at least two valley portions having a small protrusion height.

In the tire of the present invention, it is desirable that the upper end surface of the first outer wall portion includes a curved surface in which the mountain portion and the valley portion are connected by a smooth curved surface.

In the tire of the present invention, it is desirable that the first outer wall portion has a first cross-sectional contour orthogonal to the normal direction, and the first cross-sectional contour has a circular shape or an elliptical shape.

In the tire of the present invention, it is desirable that the microprojections have an arrangement pitch of 0.6 to 2.0 mm.

In the tire of the present invention, the microprojection includes at least one first protrusion, and the first protrusion includes a first recess and a first outer wall portion that surrounds the circumference of the first recess and forms a first top portion. The first outer wall portion extends from the outer surface in a direction inclined with respect to the normal direction of the outer surface. Such microprojections can enhance the contrast in the decorative portion due to the inclination of the first outer wall portion and the first concave portion, and can improve the appearance of the tire.

It is a partial perspective view which shows one Embodiment of the tire of this invention. It is an enlarged perspective view of a decorative part. It is a perspective view of the 1st protrusion. It is sectional drawing of the 1st protrusion. It is a perspective view of the 2nd protrusion. It is sectional drawing of the 2nd protrusion. It is an enlarged perspective view of the decorative part of another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partial perspective view showing the tire 1 of the present embodiment. The tire 1 is preferably used as a pneumatic tire for a passenger car. The tire 1 is not limited to a pneumatic tire for a passenger vehicle, for example, a pneumatic tire for a heavy load, a pneumatic tire for a two-wheeled vehicle, and a non-pneumatic tire in which the inside of the tire is not filled with pressurized air. It can be used for various tires such as.

As shown in FIG. 1, the tire 1 of the present embodiment includes a tread portion 2 that comes into contact with the road surface during traveling, a sidewall portion 3 that is arranged inside the tread portion 2 in the tire radial direction, and a sidewall portion 3. It includes a bead portion 4 arranged inside in the radial direction of the tire. The bead portion 4 is a portion that meshes with the rim when attached to the rim (not shown). The sidewall portion 3 is a portion that connects the tread portion 2 and the bead portion 4.

The tire 1 of the present embodiment includes a visible outer surface 1a. Here, the visible outer surface 1a is a surface that can be visually recognized from the outside when the tire 1 is mounted on the rim. The outer surface 1a includes, for example, the outer surface 2a of the tread portion 2, the outer surface 3a of the sidewall portion 3, and the outer surface 4a of the bead portion 4.

The tire 1 of the present embodiment has a decorative portion 5 on at least a part of a visible outer surface 1a. In the present embodiment, the decorative portion 5 provided on the outer surface 3a of the sidewall portion 3 is exemplified. The decorative portion 5 is not limited to such a position, and may be provided on, for example, the outer surface 2a of the tread portion 2 or the outer surface 4a of the bead portion 4. Such a decorative portion 5 can give a visual stimulus to the user and improve the appearance of the tire 1.

FIG. 2 is an enlarged perspective view of the decorative portion 5. As shown in FIG. 2, a plurality of microprojections 6 projecting from the outer surface 1a are arranged in the decorative portion 5 of the present embodiment. Such microprojections 6 can enhance the contrast in the decorative portion 5 by diffusing light.

The microprojection 6 of the present embodiment includes at least one first projection 6A. It is desirable that the first protrusion 6A includes a first recess 7A and a first outer wall portion 8A that surrounds the circumference of the first recess 7A to form a first top portion 8a. Such a first protrusion 6A can increase the contrast in the decorative portion 5 by absorbing light in the first recess 7A. Therefore, the tire 1 of the present embodiment can improve the appearance.

The first outer wall portion 8A of the present embodiment extends from the outer surface 1a in a direction inclined with respect to the normal direction N of the outer surface 1a. Here, the fact that the first outer wall portion 8A extends in a direction inclined with respect to the normal direction N means that at least one pair of first wall portion contour lines of the first vertical cross-sectional contour 12A (shown in FIG. 3) described later. It means that 12a has different angles with respect to the outer surface 1a.

That is, in the first protrusion 6A of the present embodiment, the axis 6a in the protruding direction extends from the outer surface 1a in a direction in which it is inclined with respect to the normal direction N of the outer surface 1a. Here, the axis 6a of the first protrusion 6A is defined as a line connecting the centers of the first cross-sectional contour 12B (shown in FIG. 3), which will be described later, in the protruding direction. The contrast of such microprojections 6 can be changed according to the direction of the line of sight due to the inclination of the first outer wall portion 8A, that is, the first projections 6A, and the appearance of the decorative portion 5 can be improved.

FIG. 3 is a perspective view of the first protrusion 6A, and FIG. 4 is a cross-sectional view of the first protrusion 6A. As shown in FIGS. 3 and 4, the first outer wall portion 8A has, for example, a first vertical cross-sectional contour 12A orthogonal to the outer surface 1a. The first vertical cross-sectional contour 12A may be formed in, for example, any cross section. The first vertical cross-sectional contour 12A is preferably formed in a cross section including the axis 6a.

At least one of the first vertical cross-sectional contours 12A preferably includes a pair of first wall contours 12a extending from the outer surface 1a to the first top 8a. The pair of first wall contour lines 12a of the present embodiment has a first angle θ1 with respect to the outer surface 1a of one first wall contour line 12a at a position 12 m in the middle of the normal direction N, and the other first. It is smaller than the second angle θ2 with respect to the outer surface 1a of the wall contour line 12a. Here, the position 12m in the middle of the normal direction N of the first wall portion contour line 12a is defined as 1/2 of the height H1 of the mountain portion 9A of the first outer wall portion 8A, that is, H1 / 2. .. Such a first outer wall portion 8A can easily recognize the degree of inclination with respect to the outer surface 1a.

The first angle θ1 is preferably 45 ° or more. When the first angle θ1 is 45 ° or more, it is possible to prevent cracks and chips from being generated in the first protrusion 6A when the mold is removed from the vulcanization molding die. From such a viewpoint, the first angle θ1 is more preferably 50 ° or more, still more preferably 55 ° or more.

The first angle θ1 is preferably less than 90 °. When the first angle θ1 is less than 90 °, the change in contrast of the decorative portion 5 according to the direction of the line of sight can be increased. From such a viewpoint, the first angle θ1 is preferably 85 ° or less, more preferably 80 ° or less.

The second angle θ2 is preferably 90 ° or more. When the second angle θ2 is 90 ° or more, the rigidity of the first protrusion 6A can be improved, and the occurrence of cracks and chips can be suppressed. From such a viewpoint, the second angle θ2 is more preferably 95 ° or more, still more preferably 100 ° or more.

The sum (θ1 + θ2) of the first angle θ1 and the second angle θ2 is preferably 180 ° or more. When the sum (θ1 + θ2) is 180 ° or more, the rigidity of the first protrusion 6A can be improved, and the occurrence of cracks and chips can be suppressed. From such a viewpoint, the sum (θ1 + θ2) is more preferably 190 ° or more, and further preferably 200 ° or more.

The first outer wall portion 8A of the present embodiment includes at least two peak portions 9A having a large protrusion height in the normal direction N and at least two valley portions 10A having a small protrusion height. The first outer wall portion 8A of the present embodiment is substantially tubular, and peak portions 9A and valley portions 10A are alternately arranged in the circumferential direction. Such a first outer wall portion 8A can diffuse light at the first top portion 8a, and can enhance the contrast in the decorative portion 5.

The height H1 of the mountain portion 9A of the first outer wall portion 8A is preferably 0.20 to 0.60 mm. Here, the height H1 of the mountain portion 9A of the first outer wall portion 8A is the height H1 of the mountain portion 9A of the first outer wall portion 8A of the first outer wall portion 8A, and the height H1 of the valley portion 10A of the first outer wall portion 8A. The H2 is preferably 0.10 to 0.50 mm. Such a first outer wall portion 8A is suitable for diffusing light at the first top portion 8a.

It is desirable that the first upper end surface 11A of the first outer wall portion 8A includes a curved surface 11a in which the peak portion 9A and the valley portion 10A are connected by a smooth curved surface. The first upper end surface 11A of the first outer wall portion 8A may be formed as, for example, a bent surface (not shown) in which a mountain portion 9A and a valley portion 10A are connected by a flat inclined surface. Such a first upper end surface 11A can diffuse light and is useful for increasing the contrast in the decorative portion 5.

The first outer wall portion 8A has, for example, a first cross-sectional contour 12B orthogonal to the normal direction N. The first cross-sectional contour 12B is preferably circular or elliptical. Such a first outer wall portion 8A has a good light diffusing effect, and can further enhance the contrast in the decorative portion 5.

The first outer wall portion 8A has, for example, a maximum width W1 having the largest width on the outermost surface 1a side. The maximum width W1 of the first outer wall portion 8A is preferably 0.30 to 1.00 mm. When the maximum width W1 of the first outer wall portion 8A is 0.30 mm or more, the rigidity of the first outer wall portion 8A can be ensured and cracks and chips can be suppressed. When the maximum width W1 of the first outer wall portion 8A is 1.00 mm or less, the reflection of light on the first outer wall portion 8A can be suppressed and the contrast in the decorative portion 5 can be enhanced.

It is desirable that the top width W2 on the first top 8a side of the first outer wall portion 8A is substantially equal to the maximum width W1 on the outer surface 1a side or smaller than the maximum width W1 on the outer surface 1a side. The top width W2 of the first outer wall portion 8A is preferably 0.25 to 0.95 mm. Such a first outer wall portion 8A can enhance the contrast in the decorative portion 5 while suppressing the occurrence of cracks and chips.

The first recess 7A of the present embodiment is formed along the axis 6a of the first protrusion 6A. The orientation of the first recess 7A is not limited to such an embodiment, and may be formed along the normal direction N, for example. Such a first recess 7A is suitable for absorbing light.

The recess depth of the first recess 7A of the present embodiment is substantially equal to the protrusion height of the first outer wall portion 8A. The recess depth of the first recess 7A is not limited to such an embodiment, and may be larger than the protrusion height of the first outer wall portion 8A and smaller than the protrusion height of the first outer wall portion 8A, for example. You may.

The depth D1 of the first recess 7A with respect to the mountain portion 9A is preferably 0.15 to 0.60 mm. The depth D2 of the first recess 7A with respect to the valley portion 10A is preferably 0.15 to 0.50 mm. Such a first recess 7A is suitable for absorbing light while maintaining the rigidity of the first protrusion 6A.

The first recess 7A has, for example, a circular or elliptical cross section orthogonal to the normal direction N. It is desirable that the cross section of the first recess 7A resembles the first cross section contour 12B. Such a first recess 7A can diffuse light inside the first recess 7A, which helps to improve the light absorption.

The bottom width W3 of the first recess 7A on the outer surface 1a side is preferably 0.90 mm or less. The top width W4 on the first top 8a side of the first recess 7A is preferably 0.10 to 0.90 mm. Such a first recess 7A can exhibit good light absorption while maintaining the rigidity of the first outer wall portion 8A.

It is desirable that the first upper end surface 11A of the first outer wall portion 8A has a substantially constant width W5. The width W5 of the first upper end surface 11A is preferably 0.2 mm or less. The width W5 of the first upper end surface 11A may be, for example, partially different, and even in that case, it is desirable that the width W5 is in the range of 0.2 mm or less. Such a first upper end surface 11A can suppress the reflection of light and enhance the contrast in the decorative portion 5.

As shown in FIG. 2, the microprojection 6 of the present embodiment further includes at least one second projection 6B. The second protrusion 6B preferably includes a second recess 7B and a second outer wall portion 8B that surrounds the second recess 7B to form a second top 8b. Such a second protrusion 6B can increase the contrast in the decorative portion 5 by absorbing light in the second recess 7B. Therefore, the tire 1 of the present embodiment can improve the appearance.

The second outer wall portion 8B of the present embodiment extends from the outer surface 1a in the normal direction N. Here, the fact that the second outer wall portion 8B extends in the normal direction N means that at least one pair of second wall portion contour lines 12b of the second vertical cross-sectional contour 12C (shown in FIG. 5) described later is the outer surface 1a. Means having the same angle with respect to.

That is, in the second protrusion 6B of the present embodiment, the axis 6b in the protruding direction extends from the outer surface 1a in the normal direction N. Here, the axis 6b of the second protrusion 6B is defined as a line connecting the centers of the second cross-sectional contour 12D (shown in FIG. 5), which will be described later, in the protruding direction. Such microprojections 6 can express a striped or mottled pattern on the decorative portion 5 due to the difference in contrast between the first projections 6A and the second projections 6B, and improve the appearance of the tire 1. Can be done.

FIG. 5 is a perspective view of the second protrusion 6B, and FIG. 6 is a cross-sectional view of the second protrusion 6B. As shown in FIGS. 5 and 6, the second outer wall portion 8B has, for example, a second vertical cross-sectional contour 12C orthogonal to the outer surface 1a. The second vertical cross-sectional contour 12C may be formed in, for example, an arbitrary cross section. The second vertical cross-sectional contour 12C is preferably formed in a cross section including the axis 6b.

The second vertical cross-sectional contour 12C preferably includes a pair of second wall contour lines 12b extending from the outer surface 1a to the second top 8b. The pair of second wall contour lines 12b of the present embodiment has a third angle θ3 with respect to the outer surface 1a of one second wall contour line 12b at an intermediate position 12n in the normal direction N, and the other second. It is equal to the fourth angle θ4 with respect to the outer surface 1a of the wall contour line 12b. Here, the position 12n in the middle of the second wall portion contour line 12b in the normal direction N is defined as 1/2 of the height H3 of the mountain portion 9B of the second outer wall portion 8B, that is, H3 / 2, which will be described later. .. It is easy to secure the symmetry of such a second outer wall portion 8B.

The second outer wall portion 8B of the present embodiment includes at least two peak portions 9B having a large protrusion height in the normal direction N and at least two valley portions 10B having a small protrusion height. The second outer wall portion 8B of the present embodiment is substantially tubular, and peak portions 9B and valley portions 10B are alternately arranged in the circumferential direction. Such a second outer wall portion 8B can diffuse light at the second top portion 8b, and can enhance the contrast in the decorative portion 5.

The height H3 of the mountain portion 9B of the second outer wall portion 8B is preferably 0.20 to 0.60 mm. The height H4 of the valley portion 10B of the second outer wall portion 8B is preferably 0.10 to 0.50 mm. Such a second outer wall portion 8B is suitable for diffusing light at the second top portion 8b.

It is desirable that the second upper end surface 11B of the second outer wall portion 8B includes a curved surface 11b in which the peak portion 9B and the valley portion 10B are connected by a smooth curved surface. The second upper end surface 11B of the second outer wall portion 8B may be formed as, for example, a bent surface (not shown) in which the mountain portion 9B and the valley portion 10B are connected by a flat inclined surface. Such a second upper end surface 11B can diffuse light and helps to increase the contrast in the decorative portion 5.

The second outer wall portion 8B has, for example, a second cross-sectional contour 12D orthogonal to the normal direction N. The second cross-sectional contour 12D is preferably circular or elliptical. Such a second outer wall portion 8B has a good light diffusing effect, and can further enhance the contrast in the decorative portion 5.

The second outer wall portion 8B has, for example, a maximum width W6 having the largest width on the outermost surface 1a side. The maximum width W6 of the second outer wall portion 8B is preferably 0.30 to 1.00 mm. When the maximum width W6 of the second outer wall portion 8B is 0.30 mm or more, the rigidity of the second outer wall portion 8B can be ensured and cracks and chips can be suppressed. When the maximum width W6 of the second outer wall portion 8B is 1.00 mm or less, the reflection of light on the second outer wall portion 8B can be suppressed and the contrast in the decorative portion 5 can be enhanced.

It is desirable that the top width W7 on the second top 8b side of the second outer wall portion 8B is substantially equal to the maximum width W6 on the outer surface 1a side or smaller than the maximum width W6 on the outer surface 1a side. The top width W7 of the second outer wall portion 8B is preferably 0.25 to 0.95 mm. Such a second outer wall portion 8B can enhance the contrast in the decorative portion 5 while suppressing the occurrence of cracks and chips.

The second recess 7B of the present embodiment is formed along the axis 6b of the second protrusion 6B, that is, along the normal direction N. The direction of the second recess 7B is not limited to such an aspect, and may be formed in a direction inclined with respect to the normal direction N, for example. Such a second recess 7B is suitable for absorbing light.

The recess depth of the second recess 7B of the present embodiment is smaller than the protrusion height of the second outer wall portion 8B. The recess depth of the second concave portion 7B is not limited to such an embodiment, and may be substantially equal to, for example, the protrusion height of the second outer wall portion 8B, and is larger than the protrusion height of the second outer wall portion 8B. It may be large.

The depth D3 of the second recess 7B with respect to the mountain portion 9B is preferably 0.15 to 0.60 mm. The depth D2 of the second recess 7B with respect to the valley portion 10B is preferably 0.15 to 0.50 mm. Such a second recess 7B is suitable for absorbing light while maintaining the rigidity of the second protrusion 6B.

The second recess 7B has, for example, a circular or elliptical cross section orthogonal to the normal direction N. It is desirable that the cross section of the second recess 7B resembles the second cross section contour 12D. Such a second recess 7B can diffuse light inside the second recess 7B, which helps to improve the light absorption.

The bottom width W8 of the second recess 7B on the outer surface 1a side is preferably 0.90 mm or less. The top width W9 on the second top 8b side of the second recess 7B is preferably 0.10 to 0.90 mm. It is desirable that the bottom width W8 of the second recess 7B is equal to or less than the top width W9. Such a second recess 7B can exhibit good light absorption while maintaining the rigidity of the second outer wall portion 8B.

It is desirable that the second upper end surface 11B of the second outer wall portion 8B has a substantially constant width W10. The width W10 of the second upper end surface 11B is preferably 0.20 mm or less. The width W10 of the second upper end surface 11B may be, for example, partially different, and even in that case, it is desirable that the width W10 is in the range of 0.20 mm or less. Such a second upper end surface 11B can suppress the reflection of light and enhance the contrast in the decorative portion 5.

As shown in FIGS. 1 and 2, the decorative portion 5 of the present embodiment includes a first region 5A in which the first protrusion 6A is arranged and a second region 5B in which the second protrusion 6B is arranged. There is. Such a decorative portion 5 can express a striped pattern due to the difference in contrast between the first protrusion 6A and the second protrusion 6B, and can improve the appearance of the tire 1. The arrangement of the first region 5A and the second region 5B is not limited to such an embodiment, and may be arranged in a mottled manner, and a plurality of first protrusions 6A having different angles θ may be arranged. Region 5A may be provided.

The microprojection 6 may further include, for example, a third projection 6C (not shown). In this case, the decorative portion 5 preferably includes a third region 5C (not shown) in which the third protrusion 6C is arranged. The third protrusion 6C is inclined in a direction different from that of the first protrusion 6A, for example. The third protrusion 6C may have a different inclination angle from the first protrusion 6A, for example. The microprojection 6 may further include a fourth projection 6D or the like (not shown) having a different inclination direction or inclination angle. Such a decorative portion 5 has a high degree of freedom in forming a striped or mottled pattern.

As shown in FIG. 2, in the decorative portion 5 of the present embodiment, a plurality of microprojections 6 are arranged at a density of 2 to 10 per ^{1 mm 2.} Such microprojections 6 are useful for increasing the contrast in the decorative portion 5.

The microprojections 6 preferably have an arrangement pitch P of 0.6 to 2.0 mm. Here, the arrangement pitch P is defined as the distance between the centers of the minute protrusions 6. The microprojections 6 of the present embodiment are arranged in a staggered pattern. The arrangement of the microprojections 6 is not limited to such an embodiment, and may be arranged in a grid pattern, for example. Such an arrangement of the microprojections 6 is useful for increasing the contrast in the decorative portion 5.

The space between the microprojections 6 of the decorative portion 5 includes an uneven portion 13 having a height of 0.05 mm or less. Such an uneven portion 13 brings a shadow to the decorative portion 5 and helps to further enhance the contrast in the decorative portion 5. Further, such a concave-convex portion 13 is also useful for increasing the rigidity of the decorative portion 5 and suppressing the chipping of the minute protrusions 6.

As shown in FIG. 1, the tire 1 has, for example, a non-decorative portion 14 adjacent to the decorative portion 5 on at least a part of the outer surface 1a. In the present embodiment, similarly to the decorative portion 5, the non-decorative portion 14 is provided on the outer surface 3a of the sidewall portion 3 as an example. The non-decorative portion 14 is not limited to such a position, and may be provided on, for example, the outer surface 2a of the tread portion 2 or the outer surface 4a of the bead portion 4. Such a non-decorative portion 14 can give a visual stimulus to the user and improve the appearance of the tire 1 due to the contrast with the decorative portion 5.

The non-decorative portion 14 of the present embodiment includes a raised portion 14a that is raised from the outer surface 3a. The raised portion 14a is composed of, for example, a side surface 14b extending outward from the outer surface 1a and a top surface 14c formed of a smooth surface connected to the side surface 14b. By reflecting light on such a top surface 14c, the contrast with respect to the decorative portion 5 is enhanced, and the visibility of the non-decorative portion 14 can be improved. The non-decorative portion 14 is formed as, for example, a mark which is a symbol such as a character or a mark indicating a manufacturer name, a product name, a size, or the like of the tire 1.

FIG. 7 is an enlarged perspective view of the decorative portion 15 of another embodiment. Elements having the same functions as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 7, in the decorative portion 15 of this embodiment, a plurality of first protrusions 16 whose axis lines 16a in the direction of protrusion from the outer surface 1a are inclined with respect to the normal direction N of the outer surface 1a. Includes. In FIG. 7, only the first region 15A in which the first protrusion 16 is arranged is illustrated, but the decorative portion 15 may be provided with, for example, a second region 5B (shown in FIG. 2).

The plurality of first protrusions 16 of this embodiment are randomly provided with a direction of inclination, an angle, a size, an arrangement pitch P, and the like. Such a decorative portion 15 can make damaged parts such as cracks and chips inconspicuous, and can improve the appearance of the tire 1.

Although the particularly preferable embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and can be modified into various embodiments.

The tires of the examples shown in FIGS. 1 to 6 were prototyped based on the specifications shown in Table 1. As a comparative example, a tire in which all of the decorative parts were formed by the second protrusion was prototyped. The appearance of the tire was tested using these prototype tires. The common specifications and test methods for the prototype tires are as follows.

<Common specifications>
Height of the mountain part of the second outer wall H3: 0.30 mm
Height of the valley of the second outer wall H4: 0.20 mm
Maximum width of the second outer wall W6: 0.51 mm
Top width of the second outer wall W7: 0.41 mm
Depth of the mountain part of the second recess D3: 0.25 mm
Depth of the valley of the second recess D4: 0.15 mm
Bottom width of the second recess W8: 0.20 mm
Top width of the second recess W9: 0.31 mm
Second top width W10: 0.05mm
Concavo-convex height: 0.03 mm

<Common specifications of the examples>
Height of the mountain part of the first outer wall H1: 0.30 mm
Height of the valley part of the first outer wall H2: 0.20 mm
Maximum width of the first outer wall W1: 0.51 mm
Top width W2 of the first outer wall: 0.51 mm
Depth of the mountain part of the first recess D1: 0.30 mm
Depth of valley of first recess D2: 0.20 mm
Bottom width W3 of the first recess: 0.31 mm
Top width of the first recess W4: 0.31 mm
Width of the first top W5: 0.10 mm

<Appearance>
The appearance of each prototype tire was evaluated by the evaluator's sensuality based on the contrast between the decorative portion and the non-decorative portion and the contrast between the first region and the second region. The result is an index with a comparative example of 100, and the larger the value, the better the appearance.

The test results are shown in Table 1.

As a result of the test, it was confirmed that the tire of the example was superior in appearance as compared with the comparative example.

1 Tire 1a Outer surface 5 Decorative part 6 Micro protrusion 6A First protrusion 7A First recess 8A First outer wall part 8a First top

Claims (11)

It ’s a tire
It has a decorative part on at least a part of the visible outer surface,
A plurality of microprojections protruding from the outer surface are arranged in the decorative portion.
The microprojections include at least one first projection.
The first protrusion includes a first recess and a first outer wall portion that surrounds the first recess and forms a first top.
The first outer wall portion extends from the outer surface in a direction inclined with respect to the normal direction of the outer surface.
tire. The first outer wall portion has a first vertical cross-sectional contour orthogonal to the outer surface.
At least one of the first longitudinal cross-sectional contours includes a pair of first wall contours extending from the outer surface to the first top.
The pair of the first wall contour lines have a first angle θ1 with respect to the outer surface of one of the first wall contour lines at a position intermediate in the normal direction, and the other first wall contour line. The tire according to claim 1, which is smaller than the second angle θ2 with respect to the outer surface of the tire. The tire according to claim 2, wherein the first angle θ1 is 45 ° or more. The tire according to claim 2 or 3, wherein the first angle θ1 is less than 90 °. The tire according to any one of claims 2 to 4, wherein the sum (θ1 + θ2) of the first angle θ1 and the second angle θ2 is 180 ° or more. The microprojections further include at least one second projection.
The second protrusion includes a second recess and a second outer wall portion that surrounds the second recess and forms a second top.
The tire according to any one of claims 1 to 5, wherein the second outer wall portion extends from the outer surface in the normal direction. The second outer wall portion has a second vertical cross-sectional contour orthogonal to the outer surface.
The second longitudinal cross-sectional contour includes a pair of second wall contours extending from the outer surface to the second top.
The pair of the second wall contour lines have a third angle θ3 with respect to the outer surface of one of the second wall contour lines at a position intermediate in the normal direction, and the other second wall contour line. The tire according to claim 6, which is equal to the fourth angle θ4 with respect to the outer surface of the tire. The first outer wall portion according to any one of claims 1 to 7, wherein the first outer wall portion includes at least two peak portions having a large protrusion height in the normal direction and at least two valley portions having a small protrusion height. The tires listed. The tire according to claim 8, wherein the upper end surface of the first outer wall portion includes a curved surface in which the mountain portion and the valley portion are connected by a smooth curved surface. The first outer wall portion has a first cross-sectional contour orthogonal to the normal direction.
The tire according to any one of claims 1 to 9, wherein the first cross-sectional contour has a circular shape or an elliptical shape. The tire according to any one of claims 1 to 10, wherein the microprojections have an arrangement pitch of 0.6 to 2.0 mm.

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