JP2016215700A - tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire capable of increasing visibility in a pattern area of an outer face of the tire by enhancing uniformity of appearances of a pattern part viewed from different angles as well as increasing durability.SOLUTION: In a tire, a plurality of unit patterns are formed in a pattern area, having a protruding height between 0.1 mm and 1.0 mm from a base part, and including extending parts each of which extends from an inflection point to a plurality of directions in a planar view and in each of which a cross section orthogonal to the extending direction has a distance between both side walls becoming greater as approaching the base part from a top side. Each distance between the inflection points of the unit patterns adjacent to each other is between 0.2 mm and 1.0 mm.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a tire having a pattern formed on an outer surface.

  Conventionally, a pattern having contrast is formed by forming fine protrusions on a side portion of a tire. For example, Patent Literature 1 discloses a technique for obtaining a marking exhibiting a large contrast on the surface of the same color by forming a plurality of protrusions distributed over the entire pattern.

International Publication No. 2012/131089

  The pattern having the above contrast exhibits a contrast with the surroundings that reflect the light by controlling the reflection of the light. However, in Patent Document 1, since the protrusion has anisotropy, the pattern portion may not be seen uniformly when the viewing angle is changed. Further ingenuity is required for the irregularities formed in the pattern in order to improve the visibility by controlling the reflection of light.

  In consideration of the above fact, the present invention improves the visibility of the pattern area on the outer surface of the tire by improving the uniformity of the appearance of the pattern portion when the viewing angle is changed, and is formed in the pattern area. It is an object of the present invention to provide a tire in which the durability of the protrusion is ensured.

  The tire according to claim 1 is formed on the outer surface of the tire, has a pattern region having a base portion, and is formed in the pattern region, and has a protruding height of 0.1 mm or more and 1.0 mm or less from the base portion, A plurality of extending portions that extend in a plurality of directions from a bending point in plan view and have a distance between side wall surfaces on both sides that increases from the top side toward the base portion when viewed in a cross section orthogonal to the extending direction. The interval between the bending points of the adjacent unit patterns is 0.2 mm or more and 1.0 mm or less.

  A pattern region having a base portion is formed on the outer surface of the tire of the present invention. Here, the outer surface of the tire refers to a surface that is visible from the outside of the tire, such as a tire side portion, a tread portion, a tread groove bottom, and a groove wall. The tire of the present invention includes both pneumatic tires and non-pneumatic tires.

  A plurality of unit patterns are formed in the pattern region. The unit pattern has a protruding height of 0.1 mm or more and 1.0 mm or less from the base portion, and is formed to include an extending portion extending in a plurality of directions from the bending point in plan view. And the space | interval of the bending points of an adjacent unit pattern is 0.2 mm or more and 1.0 mm or less. By forming such a unit pattern on the base portion, light incident on the pattern region is suppressed from being reflected, and a contrast with the outside of the pattern region can be obtained.

  Moreover, the extension part has a long distance from the top side toward the base part when viewed in a cross section perpendicular to the extension direction. Thus, by comprising a side wall surface, the space | interval of extension parts can be expanded on the top part (projection front-end | tip) side of an extension part, and light can be incident between extension parts in a wide range. And since the light which injected between the extension parts is reflected by the inclined side wall surface, it can suppress that reflected light returns outside between the extension parts. Moreover, the extension part is stably suppressed from falling down, and the durability can be improved.

  In the tire according to claim 2, the adjacent unit patterns are arranged in a direction in which at least one extension portion of one unit pattern is different from all the extension portions of other unit patterns in a plan view. It has been extended.

  As described above, by providing the extension portions having different directions in the adjacent unit patterns, the reflection direction of the light reflected from the pattern region can be varied, and the concentration of the reflected light is suppressed. Thereby, the uniformity of the appearance of the pattern portion when the viewing angle is changed can be improved, and the visibility of the tire outer surface can be improved.

  The tire according to claim 3 is characterized in that the protruding height of the extending portion is 0.8 to 6 times the distance between the base portions of the side wall surfaces in the base portion.

  If the protruding height of the extending portion is smaller than 0.8 times the distance between the base portions of the side wall surfaces, the ratio of the reflected light returning from between the extending portions to the outside increases, and the improvement in visibility decreases. On the other hand, when the protruding height of the extending portion is larger than 6 times the distance between the base portions of the side wall surfaces, the extending portion is likely to fall down. Therefore, in consideration of the effect of suppressing the reflected light of the light incident between the extending portions from returning from between the extending portions and the durability of the extending portions, the protruding height of the extending portions is on the side. It is preferably 0.8 to 6 times the distance between the bases of the wall surfaces.

  The tire according to claim 4 is characterized in that an angle between a virtual vertical surface and the side wall surface with respect to the base portion is 5 ° to 30 °.

  When the angle between the virtual vertical surface and the side wall surface with respect to the base portion is larger than 30 °, the ratio of the reflected light returning from between the extending portions to the outside increases, and the improvement in visibility decreases. On the other hand, if the angle between the virtual vertical surface and the side wall surface with respect to the base portion is smaller than 5 °, the extending portion is likely to fall. Therefore, in consideration of the effect of suppressing the reflected light of the light incident between the extending portions from returning from between the extending portions and the durability of the extending portions, the virtual vertical surface and the side wall surface with respect to the base portion The angle between is preferably 5 ° to 30 °. In addition, when the angle of a side wall surface is not constant, the angle of the said side wall surface means the average angle.

  In the tire according to claim 5, the number of the extending portions is three or more, and the angle formed between the adjacent extending portions is an equal angle.

  Thus, by arranging the extended portions of the unit patterns, the extended portions can be supported with good balance. Therefore, the unit pattern is less likely to fall than the interval between the extending portions that is not equal, and the durability of the unit pattern can be improved.

  The tire according to claim 6 is characterized in that the pattern region is formed in a tire side portion.

  Since the tire side portion is visible even after the tire is mounted on the vehicle, the appearance can be further improved by forming a pattern region that increases the contrast.

  The tire according to claim 7 is characterized in that the pattern region is formed in a groove of a tread.

  Here, the groove of the tread includes both the groove bottom and the groove wall. By forming the pattern region in the tread groove, the contrast between the tread surface and the tread groove is increased, and the appearance of the tread portion can be improved by making the groove look deeper.

  According to the present invention, in the pattern area on the outer surface of the tire, the uniformity of the appearance of the pattern portion when the viewing angle is changed is improved to improve the visibility, and the durability of the protrusion formed in the pattern area is improved. Can be secured.

1 is a side view of a tire according to a first embodiment. It is a part of pattern area | region of the tire which concerns on 1st Embodiment. It is a partial enlarged view of the pattern area | region of the tire which concerns on 1st Embodiment. (A) is sectional drawing of the AA line of FIG. 3, (B) is sectional drawing of the BB line of FIG. It is a partial enlarged view of the mark part of the tire concerning a 1st embodiment. It is sectional drawing of the part corresponding to FIG. 4 (A) (B) of the tire which concerns on the modification of 1st Embodiment. It is sectional drawing of the 1st extension part of the tire which concerns on the modification of 1st Embodiment. It is a partial enlarged view of the pattern area | region of the tire which concerns on 2nd Embodiment. It is a part of pattern area | region of the tire which concerns on 2nd Embodiment. It is a partial perspective cross section of the tread of the tire concerning a 4th embodiment. It is Table 1 which shows the result of a test example.

  [First Embodiment]

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a side view of a tire 10 according to this embodiment. In the present embodiment, the tire circumferential direction is indicated by C, and the tire radial direction is indicated by R.

  A mark portion 14 is formed on the tire side portion 12 of the tire 10. The mark portion 14 has a belt-like arc shape and is formed at two symmetrical positions with the tire center axis CE (see FIG. 1) in between. A pattern area 20 and a character area 16 are arranged in the mark portion 14. The character area 16 is displayed with characters “ABCDEFGH” displayed on a smooth surface, for example. In the mark portion 14 </ b> A on the upper side of FIG. 1, the pattern region 20 is a kind of decorative band other than the character region 16 of the mark portion 14 </ b> A and is formed so as to surround the character region 16. On the other hand, in the mark portion 14B on the lower side of the paper surface of FIG. 1, the pattern region 20 is the same region as the character region 16 of the mark portion 14B, and the portion other than the character region 16 of the mark portion 14B is the tire side portion. The outer surface other than the twelve mark portions 14 is the same. In the present embodiment, the mark portion 14A will be described. In addition, the mark part 14 containing the pattern area | region 20 can be formed by providing the unevenness | corrugation in a tire mold by laser processing. Moreover, it is preferable that the pattern area | region 20 is arrange | positioned on the outer side of the tire radial direction R rather than the tire maximum width part (maximum part of the linear distance between tire side parts).

  As shown in FIG. 2, the pattern region 20 has a base portion 22. The base portion 22 forms a bottom surface in the pattern region 20, and a first asterisk protrusion 24 and a second asterisk protrusion 26 as a unit pattern protrude from the base portion 22.

  As shown in FIG. 3, the first asterisk protrusion 24 includes first extending portions 25 </ b> A- 1, 25 </ b> A- 2 having the same shape extending linearly from the center O <b> 1 serving as a bending point in different directions. 2 extending portions 25B-1 and 25B-2 and third extending portions 25C-1 and 25C-2. Hereinafter, these six extending portions are collectively referred to as an “extending portion 24E”. One extending portion 24E and the other extending portion 24E (excluding those extending in opposite directions from the center O1) form a linear shape bent at the center O1. The first extension portion 25A-1 and the first extension portion 25A-2 extend in the opposite directions from the center O1, and the first extension portion 25A-1 and the first extension portion 25A-2 A linearly continuous shape is formed. Hereinafter, the first extension portion 25A-1 and the first extension portion 25A-2 are collectively referred to as a “first extension portion 25A”. The second extending portion 25B-1 and the second extending portion 25B-2 also extend in the opposite directions from the center O1, and the second extending portion 25B-1 and the second extending portion 25B-2 A linearly continuous shape is formed. Hereinafter, the second extending portion 25B-1 and the second extending portion 25B-2 are collectively referred to as “second extending portion 25B”. The third extending portion 25C-1 and the third extending portion 25C-2 also extend in the opposite directions from the center O1, and the third extending portion 25C-1 and the third extending portion 25C-2 A linearly continuous shape is formed. Hereinafter, the third extending portion 25C-1 and the third extending portion 25C-2 are collectively referred to as a “third extending portion 25C”.

  The six extending portions 24E form an angle of 60 ° with the adjacent extending portions 24E. In other words, the first asterisk protrusion 24 has a shape in which six extending portions 24E are radially extended from the center O1. In the first asterisk protrusion 24, the first extending portions 25 </ b> A- 1 and 25 </ b> A- 2 extend substantially along the tire radial direction R.

As shown in FIG. 4, in the first asterisk protrusion 24, the cross section in the direction orthogonal to the extending direction of each extending portion 24 </ b> E has a substantially isosceles triangular shape having a flat top. Hereinafter, the top of the first extension 25A is referred to as a first top 23A, the top of the second extension 25B is referred to as a second top 23B, and the top of the third extension 25C is referred to as a third top 23C. The height from the base portion 22 to each of the first top portion 23A, the second top portion 23B, and the third top portion 23C (hereinafter referred to as “projection height H1”) is set to 0.1 mm or more and 1.0 mm or less. Hereinafter, the first top 23A, the second top 23B, and the third top 23C are collectively referred to as a first top 23A to a third top 23C. The protrusion height H1 is more preferably set within the range of 0.2 mm or more and 0.8 mm or less.
As shown in FIG. 4A, in the first asterisk protrusion 24, the base portion 22 between the first extension portion 25A and the second extension portion 25B is flat, and the first extension portion 25A. The base portion 22 between the third extending portion 25C and the third extending portion 25C has a curved surface shape. Further, as shown in FIG. 4B, in the second asterisk protrusion 26 described later, the base portion 22 between the first extension portion 27A and the second extension portion 27B is flat, and the first The base portion 22 between the extending portion 27A and the third extending portion 27C has a curved surface shape. By making the base portion 22 a curved surface, reflection of incident light is suppressed, contrast with the outside of the pattern region 20 is increased, and visibility is improved.

  The first side wall surface 23WA constituting the oblique side of the isosceles triangle of the first extending portion 25A, the second side wall surface 23WB constituting the oblique side of the isosceles triangle of the second extending portion 25B, and the third extension In the third side wall surface 23WC constituting the oblique side of the isosceles triangle of the portion 25C, the distance S between the side wall surfaces on both sides increases from the top side toward the base portion 22 when viewed in a cross section orthogonal to the extending direction. ing. The first side wall surface 23WA, the second side wall surface 23WB, and the third side wall surface 23WC form an angle θ with respect to a virtual vertical surface F with respect to the base portion 22. The angle θ is preferably in the range of 5 ° to 30 °, and more preferably in the range of 15 ° to 25 °. When the angle θ is larger than the angle 30 °, the ratio of the reflected light from the first side wall surface 23WA to the third side wall surface 23WC returning to the outside from between the extended portions 24E increases, and the improvement in visibility is small. Become. That is, the light is reflected, the difference in contrast with the outside of the pattern region 20 is reduced, and the improvement in visibility is reduced. On the other hand, when the angle θ is smaller than 5 °, the extending portion 24E is likely to fall. Therefore, the angle θ is 5 ° in consideration of the effect of suppressing the reflected light of the light incident between the extending portions 24E from returning from between the extending portions 24E and the durability of the extending portions 24E. It is preferably ˜30 °.

  In the extended portion 24E, the protrusion height H1 is preferably 0.8 to 6 times the base length B1 of the isosceles triangle (the distance between the base portions of the side wall surfaces in the base portion 22). When the protruding height H1 is smaller than 0.8 times the base length B1, the ratio of the reflected light from the first side wall surface 23WA to the third side wall surface 23WC returning from between the extending portions 24E to the outside increases. Visibility improvement is reduced. That is, the light is reflected, the difference in contrast with the outside of the pattern region 20 is reduced, and the improvement in visibility is reduced. On the other hand, when the protrusion height H1 is larger than 6 times the base length B1, the first side wall surface 23WA to the third side wall surface 23WC are at an angle close to the vertical with respect to the base portion 22, and therefore the extension portion 24E It becomes easy to fall down. Therefore, in consideration of the effect of suppressing the reflected light of the light incident between the extending portions 24E from returning from between the extending portions 24E and the durability of the extending portions 24E, the protruding height H1 is the bottom side. The length is preferably 0.8 to 6 times the length B1.

  The second asterisk protrusion 26 has the same shape as the first asterisk protrusion 24 and is disposed 90 ° rotated from the position of the first asterisk protrusion 24 about the center O1 in plan view. In the second asterisk projection 26, the first extension portions 25A-1, 25A-2, the second extension portions 25B-1, 25B-2, and the third extension portions 25C-1, 25C of the first asterisk projection 24. -2, the portion corresponding to the center O1, the first extending portions 27A-1, 27A-2, the second extending portions 27B-1, 27B-2, and the third extending portions 27C-1, 27C-2 , Referred to as the center O2. Hereinafter, the six extending portions described above are collectively referred to as an “extending portion 26E”. The portions corresponding to the first top portion 23A, the second top portion 23B, and the third top portion 23C are referred to as a first top portion 28A, a second top portion 28B, and a third top portion 28C. Hereinafter, the first top portion 28A, the second top portion 28B, and the third top portion 28C are collectively referred to as a first top portion 28A to a third top portion 28C. Further, portions corresponding to the first sidewall surface 23WA, the second sidewall surface 23WB, and the third sidewall surface 23WC are referred to as a first sidewall surface 28WA, a second sidewall surface 28WB, and a third sidewall surface 28WC. Hereinafter, the first side wall surface 23WA, the second side wall surface 23WB, and the third side wall surface 23WC are collectively referred to as a first side wall surface 23WA to a third side wall surface 23WC, and the first side wall surface 28WA, the second side wall surface 28WB, The three side wall surfaces 28WC are collectively referred to as a first side wall surface 28WA to a third side wall surface 28WC. As described above, by disposing the second asterisk protrusion 26, the extending portion 24E and the extending portion 26E have different extending directions.

  The first asterisk protrusions 24 and the second asterisk protrusions 26 are alternately arranged in the tire radial direction R and the tire circumferential direction C so as to fill the entire pattern region 20. The front ends of the first extension portions 25A-1 and 25A-2 of the first asterisk protrusion 24 are the second extension portion 27B-2 and the third extension of the second asterisk protrusion 26 adjacent in the tire radial direction R. It is inserted between the second extending portion 27B-1 and the third extending portion 27C-2 between the portions 27C-1. The distal ends of the first extending portions 27A-1 and 27A-2 of the second asterisk protrusion 26 are the second extending portion 25B-1 and the third extending portion of the first asterisk protrusion 24 adjacent to each other in the tire circumferential direction C. Between the part 25C-2, it is inserted between the second extension part 25B-2 and the third extension part 25C-1.

  The first asterisk protrusion 24 and the second asterisk protrusion 26 adjacent to each other in the tire radial direction R and the tire circumferential direction C have an interval between the center O1 and the center O2 (hereinafter referred to as “interval P”) of 0.2 mm to 1.0 mm. It is as follows. Further, the length in the extending direction from the tip of the first extending portion 25A-1 to the tip of the first extending portion 25A-2, the second extending portion 25B-2 from the tip of the second extending portion 25B-1. The length in the extension direction to the tip of the first extension portion and the length in the extension direction from the tip of the third extension portion 25C-1 to the tip of the third extension portion 25C-2 are equal, and the first asterisk protrusion in plan view The longest length is 24. This length is hereinafter referred to as “extension length L”. The extension length L is set longer than the interval P. The length in the extending direction from the tip of the first extending portion 27A-1 to the tip of the first extending portion 27A-2, and the second extending portion 27B-2 from the tip of the second extending portion 27B-1. The extension direction length from the tip of the third extension 27C-1 to the tip of the third extension 27C-2 is the second asterisk protrusion 26 in plan view. , Which is the same length as the extended length L. When the distance P is less than 0.2 mm, the lengths of the extending portions 24E and 26E are shortened, and it is difficult to ensure the moldability during manufacturing. On the other hand, when the distance P exceeds 1.0 mm, the first asterisk protrusion 24 and the second asterisk protrusion 26 are not densely arranged, and the reflected light from the base portion 22 improves the visibility of the pattern region 20. Less. Therefore, the interval P is set to 0.2 mm or more and 1.0 mm or less. The interval P is more preferably set within the range of 0.2 mm or more and 0.8 mm or less. The adjacent first asterisk protrusion 24 and second asterisk protrusion 26 are spaced apart.

  Next, the function and effect of the tire according to this embodiment will be described.

  In the pattern region 20 of the tire side portion 12 as described above, the light incident on the first asterisk protrusion 24 and the second asterisk protrusion 26 formed in the pattern region 20 is adjacent to the first side wall surface 23WA to the third side wall 23WA. Corresponds to the side wall surface 23WC, the first side wall surface 28WA to the third side wall surface 28WC. And it attenuate | damps, repeating reflection between 1st side wall surface 23WA-3rd side wall surface 23WC, and 1st side wall surface 28WA-3rd side wall surface 28WC. As a result, the light reflected to the outside of the pattern area 20 is reduced, and as shown in FIG. 5, the pattern area 20 appears black and the other areas (the character area 16 and the other tire side portions 12) are relatively Looks white. Therefore, the contrast between the pattern region 20 and other regions can be obtained. As in the present embodiment, the contrast between the pattern region 20 and the character region 16 surrounded by the pattern region 20 increases, so that the character region 16 can be clearly seen and visibility can be improved.

  Further, in the pattern region 20 of the present embodiment, the first asterisk protrusions 24 and the second asterisk protrusions 26 are alternately arranged in the tire radial direction R and the tire circumferential direction C, and the extension part 24E and the extension part 26E Each has a different extending direction. Therefore, the reflection direction of the light reflected by the pattern region 20 can be varied, and the concentration of the reflected light is suppressed. Thereby, the uniformity of the appearance of the pattern portion when the viewing angle is changed can be improved and the visibility can be improved.

  In this embodiment, the length L in the extending direction is longer than the interval P between the adjacent first asterisk protrusion 24 and second asterisk protrusion 26. Therefore, the first asterisk protrusions 24 and the second asterisk protrusions 26 as unit patterns can be easily placed close to each other, and the unit patterns in the pattern region 20 can be densely arranged. By arranging the unit patterns densely, reflection of light in the pattern region 20 can be further suppressed, and visibility can be improved.

  Further, in the present embodiment, the first asterisk protrusions 24 are configured by extending portions 24E that extend in different directions and are connected by the center O1, and the second asterisk protrusions 26 are in different directions. The extended portion 26E is extended and connected at the center O2. Therefore, each of the first asterisk projections 24 and the second asterisk projections 26 is unlikely to fall down, and the durability of the individual first asterisk projections 24 and second asterisk projections 26 can be improved. Further, since the extending portions 24E and 26E extend in different directions within the same unit pattern (the first asterisk protrusion 24 and the second asterisk protrusion 26), the reflection angle of the reflected light can be varied. And the concentration of reflected light is suppressed. Thereby, the uniformity of the appearance of the pattern portion when the viewing angle is changed can be improved and the visibility can be improved.

  In addition, since the first asterisk protrusion 24 and the second asterisk protrusion 26 are arranged independently (each separated), even if a crack occurs in the pattern region 20, the progress of the crack is suppressed. Can do.

  Further, the first asterisk protrusion 24 and the second asterisk protrusion 26 have an equal angle (60 °) between the extended portions 24E and the extended portions 26E. Accordingly, since the extended portions 24E and the extended portions 26E can support each other in a well-balanced manner, each of the first asterisk protrusion 24 and the second asterisk protrusion 26 includes the extended portions 24E and the extended portions 26E. The angle is less likely to fall than that which is not equiangular, and durability can be improved.

The extending portion 24E and the extending portion 26E are substantially isosceles triangular in cross section, and the first to third side wall surfaces 23WA to 23WC and 28WA to 28WC are viewed in a cross section orthogonal to the extending direction. Thus, the distance S between the side wall surfaces on both sides increases from the top side toward the base portion 22. Therefore, the interval between the adjacent top portions 23A to 23C and 28A to 28C is wider than the interval on the base portion 22 side, and light can be incident between the extending portions 24E and the extending portions 26E in a wide range. And since the light which entered between the extension parts 24E and between the extension parts 26E is reflected on the side wall surface, it can suppress that reflected light returns outside between extension parts.
Moreover, it becomes easy to die-cut at the time of manufacture by making the cross section of the direction orthogonal to the extension direction of the extension part 24E and the extension part 26E above, and a moldability can be improved. As a result, the first asterisk protrusion 24 and the second asterisk protrusion 26 are less likely to fall down, and the durability can be improved.

  In the present embodiment, the cross section in the direction orthogonal to the extending direction of each of the extending portion 24E and the extending portion 26E is substantially isosceles triangular, but other shapes, for example, as shown in FIG. The first apex 23A to the third apex 23C and the vicinity of the first apex 28A to the third apex 28 may be curved, and the first apex 23AR to the third apex 23CR and the first apex 28AR to the third apex 28CR may be used.

  Moreover, as shown to FIG. 7 (A), about the cross-sectional shape of the extension part 24E and the extension part 26E, it can also be made into the isosceles triangle shape with which the top parts 23A-23C were sharp. By using a sharp isosceles triangle, reflection at the top of the flat shape can be suppressed, and visibility can be improved. As shown in FIG. 7B, the angle θ1 of the first side wall surface 23WAL on the base portion 22 side may be smaller than the angle θ2 of the first side wall surface 23WAH on the top side. By making the angle θ1 smaller than the angle θ2, the extending portion 24E and the extending portion 26E are unlikely to fall down, and durability can be improved. Further, as shown in FIG. 7C, the angle θ3 of one first side wall surface 23WA-1 may be different from the angle θ4 of the other first side wall surface 23WA-2. By differentiating the angle θ3 and the angle θ4, the concentration of reflected light is suppressed. Thereby, the uniformity of the appearance of the pattern portion when the viewing angle is changed can be improved and the visibility can be improved. Also in these cases, the protruding height H1 from the base portion 22 to each of the first top portion 23A to the third top portion 23C and the first top portion 28A to the third top portion 28 is set to 0.1 mm or more. 7A to 7C, only the first extending portion 25A is illustrated.

  In the present embodiment, the unit pattern (the first asterisk protrusion 24 and the second asterisk protrusion 26) is configured by the extending portion 24 </ b> E and the extending portion 26 </ b> E extending in six directions, but extends in two different directions. The unit pattern may be formed by the extending portion, or the unit pattern may be formed by extending the extending portion in three or more different directions. Moreover, when extending the extension part in three or more different directions, the angle formed by the adjacent extension parts may be equal or different. As in the present embodiment, the extension portions can be supported in a well-balanced manner by making them equiangular.

  [Second Embodiment]

  Next, a second embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, the tire 10 of the present embodiment includes a first extension portion from the tip of the first extension portion 25 </ b> A- 1 in the first asterisk protrusion 24 and the second asterisk protrusion 26 of the first embodiment. The second extending portion 25B is longer than the extending length L1 to the tip of 25A-2 and the extending length L1 from the tip of the first extending portion 27A-1 to the tip of the first extending portion 27A-2. -1 to the leading end of the second extending portion 25B-2, and the extending length from the leading end of the second extending portion 27B-1 to the leading end of the second extending portion 27B-2. L2, an extension length L2 from the tip of the third extension 25C-1 to the tip of the third extension 25C-2, and a third extension 27C-2 from the tip of the third extension 27C-1 The main difference is that the extension length L2 to the tip of the is longer. In the present embodiment, “L” is added to the end of the reference numerals of the second extending portions 25B and 27B, the third extending portions 25C and 26C, the second extending portions 25BL and 27BL, the third extending portion 25CL, 27CL.

  As shown in FIG. 9, the second extension 25BL of the first asterisk protrusion 24 is inserted between the first extension 27A and the second extension 27BL of the adjacent second asterisk protrusion 26. Yes. The third extending portion 25CL of the first asterisk protrusion 24 is inserted between the first extending portion 27A and the third extending portion 27CL of the adjacent second asterisk protrusion 26. The second extending portion 27BL of the second asterisk protrusion 26 is inserted between the first extending portion 25A and the second extending portion 25BL of the adjacent first asterisk protrusion 24. The third extending portion 27CL of the second asterisk protrusion 26 is inserted between the first extending portion 25A and the third extending portion 25CL of the adjacent first asterisk protrusion 24.

  In the pattern region 20 of the present embodiment, the extension length L2 of the second extension portions 25BL and 27BL and the third extension portions 25CL and 26CL is longer than the length L1 of the extension portions 25A and 27A in the extension direction. Thus, the area of the flat portion of the base portion 22 is reduced. Therefore, the reflection direction of the light incident on the pattern region 20 can be varied, and the concentration of the reflected light is suppressed. Thereby, the uniformity of the appearance of the pattern portion when the viewing angle is changed can be improved and the visibility can be improved.

  [Third Embodiment]

  Next, a third embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  The tire 10 of the present embodiment is different from the first and second embodiments in that the pattern region 20 is formed on the tread 30, and the configuration of the pattern region 20 is the same as that of the first and second embodiments. .

  As shown in FIG. 10, the tire 10 includes a tread 30 on the outer side in the tire radial direction. A plurality of circumferential grooves 32 are formed in the tread 30. A mark portion 14 having a character area 16 and a pattern area 20 is formed on the groove bottom 32 </ b> A of one circumferential groove 32. The pattern region 20 can be formed in the same configuration as in the first to fourth embodiments.

  In the present embodiment, the contrast between the character region 16 of the mark portion 14 formed on the groove bottom 32A of the tread 30 and the pattern region 20 can be increased, and the visibility of the tread 30 can be improved.

  Note that the tire 10 of the first to third embodiments may be a pneumatic tire or a non-pneumatic tire.

<Test example>
In order to prove the effect of the present invention, tires of Examples 1 to 7 to which the present invention was applied and tires of Comparative Examples 1 to 5 were prepared, and the following Test 1 and Test 2 were performed.

(Test conditions)
As the test tires, tires having a size of 205 / 55R16 and a tire cross-section height SH of 114 mm were used.
The tires of Examples 1 to 7 and Comparative Examples 1 to 5 are tires having the same structure as the tire according to the first embodiment of the present invention, and the first asterisk protrusion formed in the pattern region 20 of the mark portion 14A. 24, the distance P, the protrusion height H1, and the angle θ of the second asterisk protrusion 26 are different as shown in Table 1 of FIG.

(Test 1)
In Test 1, the visibility when the pattern region was viewed from each direction was evaluated.
First, each test tire was assembled on an applied rim, and then 20 observers observed and conducted a questionnaire survey to see if the pattern area appeared blacker than a normal tire. The results are shown in Table 1 as “visibility”. In Table 1, when the number of viewers who answered that the pattern area looked blacker than a normal tire was 18 or more, A, when 10 to 17 people were B, and when 9 or less people were evaluated as C did. Table 1 also shows the number of viewers who answered that the pattern portion looked black.

(Test 2)
In Test 2, the moldability of the pattern portion was evaluated.
First, each test tire is manufactured, the occurrence of collapse of the first asterisk projection 24 and the second asterisk projection 26 constituting the pattern region of each test tire is visually evaluated, and the incidence rate of the collapse in the pattern region is evaluated. Using this as an index, the moldability of the pattern area was evaluated. The results are shown in Table 1 as “formability”. In Table 1, when the incidence rate of collapse is less than 0.1%, the moldability of the pattern region is indicated by ◯, and when the incidence rate of collapse is less than 0.1 to 0.3%, the pattern region is molded. When the incidence of collapse is 0.3% or more, the formability of the pattern region is represented by x.

  As shown in Table 1, it can be seen that the tires of Examples 1 to 7 to which the present invention is applied are improved in both visibility and moldability as compared with the tires of Comparative Examples 1 to 5.

10 tires, 12 tire side portions, 20 pattern regions, 22 base portions 23WA first side wall surfaces (side wall surfaces)
23WB 2nd side wall surface (side wall surface)
23WC 3rd side wall surface (side wall surface)
24 1st asterisk protrusion (unit pattern)
25A, 27A 1st extension part (extension part)
25B, 25BL, 27B, 27BL Second extension part (extension part)
25C, 25CL, 27C, 27CL Third extension part (extension part)
26 Second asterisk protrusion (unit pattern)
27WA 1st side wall surface (side wall surface)
27WB 2nd side wall surface (side wall surface)
27WC 3rd side wall surface (side wall surface)
30 treads, 32 circumferential grooves (grooves), P spacing, H1 protrusion height

Claims (7)

A pattern region formed on the outer surface of the tire and having a base portion;
It is formed in the pattern region, has a protruding height of 0.1 mm or more and 1.0 mm or less from the base portion, extends in a plurality of directions from a bending point in plan view, and is seen in a cross section orthogonal to the extending direction. A plurality of unit patterns including an extended portion in which the distance between the side wall surfaces on both sides becomes longer from the top side toward the base portion, and
Have
A tire in which an interval between the bending points of adjacent unit patterns is 0.2 mm or more and 1.0 mm or less.   The adjacent unit patterns are extended in a direction in which at least one extension portion of one unit pattern is different from all the extension portions of other unit patterns in plan view. The tire according to 1.   The tire according to claim 1 or 2, wherein the protruding height of the extending portion is 0.8 to 6 times a distance between base portions of the side wall surfaces in the base portion. .   The tire according to any one of claims 1 to 3, wherein an angle between a virtual vertical surface with respect to the base portion and the side wall surface is 5 ° to 30 °.   The tire according to any one of claims 1 to 4, wherein the number of the extending portions is three or more, and an angle formed between the adjacent extending portions is an equal angle.   The tire according to any one of claims 1 to 5, wherein the pattern region is formed in a tire side portion.   The tire according to any one of claims 1 to 5, wherein the pattern region is formed in a groove of a tread.

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