JP6944412B2 - tire - Google Patents

Description

The present invention relates to a tire.

Conventionally, a pattern region having a high contrast with the surroundings has been formed by forming fine protrusions on the side portion of the tire (hereinafter, referred to as "tire side portion"). .. For example, Patent Document 1 discloses a technique for obtaining markings exhibiting a large contrast on a surface of the same color by forming a plurality of protrusions distributed over the entire pattern region.

Patent Document 2 describes a tire in which a first asterisk protrusion and a second asterisk protrusion are formed so as to protrude from a base portion of a pattern region.

International Publication No. 2012/13089 Japanese Unexamined Patent Publication No. 2016-215703

By controlling the reflection of light in the pattern region as described above, high contrast with the surroundings that reflect light can be realized. However, in Patent Document 1, since the protrusions are anisotropic, the entire area of the pattern region is changed when the viewing angle of the pattern region is changed or when the angle of the light applied to the pattern region is changed. May not look uniform.

On the other hand, the asterisk protrusion described in Patent Document 2 has no anisotropy as compared with the protrusion in Patent Document 1. Therefore, even if the viewing angle of the pattern area where the asterisk protrusions are formed changes, or the angle of the light emitted to the pattern area where the asterisk protrusions are formed changes, the appearance is uniform. It is possible to improve the visibility and improve the visibility.

As a result of diligent studies, the inventor of the present application has used a protrusion having no anisotropy as compared with the protrusion of Patent Document 1, such as the asterisk protrusion described in Patent Document 2, by a specific method, thereby using the outer surface of the tire. We have come to the conclusion that a mark containing letters, symbols, figures or patterns formed on the surface can be made to stand out with higher contrast.

An object of the present invention is to provide a tire capable of enhancing the visibility of a mark formed on the outer surface of the tire.

The tire as the first aspect of the present invention is a tire in which a plurality of mark elements of the mark including letters, symbols, figures or patterns are formed at different positions on the outer surface of the tire in the tire circumferential direction. Each of the plurality of mark elements includes a base portion and a plurality of unit patterns including an extension portion that protrudes from the base portion and extends in a plurality of directions from a relay point in a plan view. When any one reference line is set, the inclination angles of the plurality of unit patterns of one of the mark elements with respect to the reference line are substantially equal, and the unit pattern of the unit pattern in one of the mark elements is described. The tilt angle with respect to the reference straight line is substantially equal to the tilt angle of the unit pattern with respect to the reference straight line in the other mark elements.
With such a configuration, the visibility of the mark formed on the outer surface of the tire can be improved.

As one embodiment of the present invention, the base portion and the plurality of unit patterns in each of the plurality of mark elements are provided on the bottom surface of the recess formed on the outer surface of the tire.
With such a configuration, damage to the mark element can be suppressed.

As one embodiment of the present invention, a plurality of the recesses are formed on the outer surface of the tire, and the base portion and the plurality of unit patterns of the plurality of mark elements are formed on the bottom surface of the recesses. It is provided in.
With such a configuration, the visibility of the mark element can be further enhanced.

As one embodiment of the present invention, the tops of the plurality of unit patterns of each of the plurality of mark elements are located in the recesses.
With such a configuration, damage to the mark element can be further suppressed.

As one embodiment of the present invention, when the unit pattern is the first unit pattern, each of the plurality of mark elements has a plurality of tilt angles with respect to the reference straight line different from those of the first unit pattern in a plan view. The second unit pattern of the above is provided, the inclination angles of the plurality of second unit patterns of the one said mark element with respect to the reference straight line are substantially equal, and the said second unit pattern of the one said mark element. The tilt angle with respect to the reference straight line is substantially equal to the tilt angle of the second unit pattern with respect to the reference straight line in the other mark element.
With such a configuration, it becomes easy to realize a mark element with higher visibility.

According to the present invention, it is possible to provide a tire capable of enhancing the visibility of a mark formed on the outer surface of the tire.

It is sectional drawing in the cross section parallel to the tire width direction in the reference state of the tire as one Embodiment of this invention. It is a side view of the tire shown in FIG. It is an enlarged view which shows the part of FIG. 2 enlarged. FIG. 3 is an enlarged view of a part of the character portion “D” in FIG. 3 and a further enlarged view of a part thereof. FIG. 5 is a cross-sectional view taken along the line II of FIG. FIG. 6 is a cross-sectional view taken along the line II-II of FIG. It is an enlarged view which enlarged part of the character part "C"-"E" in FIG.

Hereinafter, embodiments of the tire according to the present invention will be described with reference to the drawings. The same reference numerals are given to common members and parts in each figure.

The tire according to the present invention includes both pneumatic tires and non-pneumatic tires. In the present embodiment, a pneumatic tire will be illustrated as an example of the tire according to the present invention.

Hereinafter, unless otherwise specified, the dimensions, length relations, positional relations, etc. of each element are measured in a reference state in which a pneumatic tire is attached to the applicable rim, the specified internal pressure is filled, and no load is applied. It shall be.

Here, the "applicable rim" means a standard rim specified in the following standards according to the tire size ("Design Rim" in the YEAR BOOK of the following TRA. "Measuring Rim" in the STANDARDS MANUAL of the following ETRTO). .. The standard is determined by the industrial standard that is valid in the area where the tire is produced or used. For example, in the United States, "YEAR BOOK" of "The Tire and Rim Association, Inc. (TRA)" Yes, in Europe, it is "STANDARDS MANUAL" of "The European Tire Rim Technical Organization (ETRTO)", and in Japan, it is "JATMA YEAR BOOK" of "Japan Automobile Tire Association (JATTA)". The "applicable rim" includes, in addition to the current size, a size that may be included in the above industrial standards in the future. As an example of the size that can be included in the above industrial standard in the future, the size described as "FUTURE DEVELOPMENTS" in the ETRTO 2013 edition can be mentioned, but in the case of the size not described in the above industrial standard, the size is not described. A rim with a width corresponding to the bead width of a pneumatic tire.

The "specified internal pressure" refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity of a single wheel in the applicable size and ply rating described in the above-mentioned JATMA YEAR BOOK and the like, and is described in the above-mentioned industrial standard. In the case of no size, it means the air pressure (maximum air pressure) corresponding to the maximum load capacity specified for each vehicle equipped with tires. Further, the "maximum load load" described later is defined for each vehicle to which the tire is mounted in the case of the maximum tire load capacity of the standard such as JATMA for the tire of the applicable size or the size not described in the above industrial standard. It means the load corresponding to the maximum load capacity.

FIG. 1 is a diagram showing a pneumatic tire 1 (hereinafter, simply referred to as “tire 1”) as the present embodiment. Specifically, FIG. 1 shows a cross section of the tire 1 in a cross section parallel to the tire width direction A in the reference state in which the tire 1 is mounted on the applicable rim 2, the specified internal pressure is applied, and the load is not applied. It is a figure. Hereinafter, this cross section will be referred to as a “tire width direction cross section”. Since the tire 1 of the present embodiment has a configuration symmetrical with respect to the tire equatorial plane CL, FIG. 1 shows a cross section in the tire width direction of only one side of the tire width direction A with the tire equatorial plane CL in between. ing. However, the tire may have a structure asymmetrical with respect to the equatorial plane CL of the tire.

<Applicable rim 2>
The applicable rim 2 of the present embodiment shown in FIG. 1 has a rim seat portion 2a to which a bead member 3 described later of the tire 1 is attached to the outside of the tire radial direction B, and a tire diameter from both ends of the rim seat portion 2a in the tire width direction A. A rim flange portion 2b that projects outward in the direction B is provided.

<Tire 1>
As shown in FIG. 1, the tire 1 includes a tread portion 1a and a pair of tire side portions 1b extending inward in the tire radial direction B from both ends of the tread portion 1a in the tire width direction A. The tire side portions 1b are a pair of sidewall portions 1b1 extending inward in the tire radial direction B from both ends of the tread portion 1a in the tire width direction A, and inner ends of each sidewall portion 1b1 in the tire radial direction B. It is provided with a pair of bead portions 1b2 provided in the above. The tire 1 of the present embodiment is a tubeless type radial tire for a passenger car. Here, the "tread portion 1a" means a portion sandwiched by the tread ends TE on both sides in the tire width direction A. Further, the “bead portion 1b2” means a portion where the bead member 3 described later is located in the tire radial direction B. The "sidewall portion 1b1" means a portion between the tread portion 1a and the bead portion 1b2. The "tread end TE" means the outermost position of the ground contact surface in the tire width direction when the tire is mounted on the above-mentioned applicable rim, the above-mentioned specified internal pressure is applied, and the maximum load is applied. ..

Further, the tire outer surface is the outer surface 31 of the tread portion 1a, which is the outer surface of the tread portion 1a, in the tire radial direction B (hereinafter, referred to as “tread outer surface 31”), and the tire which is the outer surface of the tire side portion 1b. The side portion 1b is composed of an outer surface 32 in the tire width direction A (hereinafter, referred to as “tire side outer surface 32”). The tire side outer surface 32 is an outer surface 32a of the sidewall portion 1b1 in the tire width direction A (hereinafter, referred to as “sidewall outer surface 32a”) and an outer surface 32b of the bead portion 1b2 in the tire width direction A. (Hereinafter referred to as "bead outer surface 32b").

The tire 1 includes a bead member 3, a carcass 4, a belt 6, a tread rubber 7, a side rubber 8, and an inner liner 9.

[Bead member 3]
The bead member 3 is embedded in the bead portion 1b2. The bead member 3 includes a bead core 3a and a rubber bead filler 3b located outside the tire radial direction B with respect to the bead core 3a. The bead core 3a includes a plurality of bead wires whose perimeter is covered with rubber. The bead wire is formed of a steel cord. The steel cord can consist of, for example, a steel monofilament or stranded wire.

[Carcus 4]
The carcass 4 straddles between the pair of bead portions 1b2, more specifically between the bead cores 3a of the pair of bead members 3, and extends in a toroidal manner. Further, the carcass 4 has at least a radial structure.

Further, the carcass 4 is composed of one or more (one in the present embodiment) carcass ply 4a in which the carcass cords are arranged at an angle of, for example, 75 ° to 90 ° with respect to the tire circumferential direction C (see FIG. 1 and the like). Has been done. The carcass ply 4a includes a ply main body portion located between a pair of bead cores 3a, and ply folded portions that are folded back from the inside to the outside in the tire width direction A around the bead core 3a at both ends of the ply main body portion. ing. A bead filler 3b extending from the bead core 3a to the outside in the tire radial direction B in a tapered shape is arranged between the ply main body portion and the ply folding portion. As the carcass cord of the carcass ply 4a, a polyester cord is adopted in this embodiment, but in addition to this, an organic fiber cord such as nylon, rayon, or aramid, or a metal cord such as steel may be adopted if necessary. .. Further, the number of carcass plies 4a may be two or more.

[Belt 6]
The belt 6 includes one or more layers (two layers in this embodiment) arranged outside the tire radial direction B with respect to the crown portion of the carcass 4. Each belt layer of the belt 6 of the present embodiment includes a belt cord coated with rubber. Each belt layer may be an inclined belt layer or a circumferential belt layer. The inclined belt layer is a belt ply including belt cords that are inclined and arranged at an angle of 40 ° or less, which is larger than 10 ° with respect to the tire circumferential direction C (see FIG. 1). Further, the circumferential belt layer is a belt ply including belt cords arranged along the tire circumferential direction C (see FIG. 1) (at an angle of 10 ° or less, preferably 5 ° or less with respect to the tire circumferential direction C). Is. The belt cord of each belt layer may be a metal cord such as a steel cord or an organic fiber cord such as a nylon cord. Further, although the belt 6 of the present embodiment is configured to include two belt layers, it may be a single-layer belt 6 or a belt 6 having three or more belt layers.

[Tread rubber 7 and side rubber 8]
The tread rubber 7 constitutes a tread outer surface 31, and the tread outer surface 31 of the present embodiment has a circumferential groove 7a extending in the tire circumferential direction C (see FIG. 1 and the like) and extending in the tire width direction A. A tread pattern including existing, not shown widthwise grooves and the like is formed. The side rubber 8 constitutes the tire side outer surface 32 of the tire side portion 1b, and is integrally formed with the above-mentioned tread rubber 7.

[Inner liner 9]
The inner liner 9 is laminated on the inner surface of the carcass 4, and is formed of a butyl rubber having low air permeability in the present embodiment. The butyl rubber means a butyl rubber and a halogenated butyl rubber which is a derivative thereof.

Next, a further feature portion of the tire 1 will be described.

FIG. 2 is a side view of the tire 1 in the above-mentioned reference state. Specifically, FIG. 2 is a view of the tire side portion 1b of the tire 1 in the reference state as viewed from the outside in the tire width direction A from the front. FIG. 3 is an enlarged view showing a part of FIG. 2 in an enlarged manner. As shown in FIGS. 2 and 3, a mark 10 including characters, symbols, figures or patterns is formed on the tire side outer surface 32 of the tire outer surface of the tire 1. Although the mark 10 of the present embodiment is formed on the tire side outer surface 32 of the tire outer surface of the tire 1, the mark 10 may be formed at another position on the tire outer surface.

As shown in FIGS. 2 and 3, the mark 10 includes a plurality of mark elements 11 formed at different positions in the tire circumferential direction C on the tire side outer surface 32 of the tire outer surface.

Specifically, the mark 10 of the present embodiment is a character mark composed of only seven characters of "ABCDEFG". That is, the mark 10 of the present embodiment includes seven character portions "A" to "G" as a plurality of mark elements 11. In addition to the characters as in the present embodiment, or instead of the characters, the mark may include at least one of a symbol such as a figure and a bar code, and a pattern.

The mark 10 of the present embodiment is formed at a position inside or outside the tire radial direction B (inside position in the present embodiment) with respect to the tire maximum width position of the tire side portion 1b. Further, the character portions "A" to "G" as the plurality of mark elements 11 of the mark 10 of the present embodiment are located on the outer surface 32 of the tire side at different positions in the tire circumferential direction C, and more specifically, the present embodiment. In the form, it is formed at a position separated from the tire circumferential direction C. The mark elements 11 adjacent to the tire circumferential direction C are separated from each other by a predetermined distance in the tire circumferential direction C with the element-to-element portion 50, which is a portion between the plurality of mark elements 11 of the mark 10, interposed therebetween. The inter-element portion 50 and the periphery of the mark 10 are formed of a flat surface having no unevenness. The surface roughness of the flat surface is preferably 1 to 15 Rz (Rt). The tire side outer surface 32 of the present embodiment is provided with two marks 10 at positions facing each other in the tire radial direction B with the tire central axis O (see FIG. 2) interposed therebetween. Further, FIG. 2 shows a configuration in which only two marks 10 are provided on the outer surface 32 of the tire side, but even if other information formed by ridges or printing is formed other than the marks 10. good.

FIG. 4 is an enlarged view of a part of the character portion “D” in FIG. 3 (within the range of the broken line in FIG. 3). Further, FIG. 4 also shows an enlarged view (within the broken line range of the right figure of FIG. 4) in which a part of the character portion “D” in FIG. 3 (within the broken line range of FIG. 3) is further enlarged. As shown in FIG. 4, the character portion “D” as the mark element 11 of the present embodiment includes a base portion 12, a plurality of first unit patterns 13, a plurality of second unit patterns 14, and a connecting portion 60. And have. Although the details will be described later, the connecting portion 60 of the present embodiment is formed by extending one extending portion 16 and 21 in the first unit pattern 13 and the second unit pattern 14, respectively. It should be noted that each of the other character portions "A" to "C" and "E" to "G" as the mark element 11 shown in FIG. 3 has the same configuration as described above.

The base portion 12 forms a reference surface for each mark element 11, and the first unit pattern 13, the second unit pattern 14, and the connecting portion 60, which will be described later, project from the base portion 12 as a reference. ing.

The first unit pattern 13 includes an extension portion 16 that protrudes from the base portion 12 and extends from the relay point 15 in a plurality of directions in a plan view. Specifically, the first unit pattern 13 of the present embodiment is composed of asterisk protrusions. The asterisk projection as the first unit pattern 13 of the present embodiment includes an extension portion 16 having the same shape extending linearly from the center point O1 as the relay point 15 in different directions. More specifically, the asterisk projection as the first unit pattern 13 of the present embodiment has the first extension portion 16a as six extension portions 16 extending in different directions from the center point O1 as the relay point 15. , A second extension portion 16b, a third extension portion 16c, a fourth extension portion 16d, a fifth extension portion 16e, and a sixth extension portion 16f. Hereinafter, when the six extension portions 16 are described without distinction, they are simply described as "extension portion 16".

As shown in FIG. 4, the first extension portion 16a and the second extension portion 16b extend in opposite directions from the center point O1 as the relay point 15, and the first extension portion 16a and the second extension portion 16a and the second extend portion 16a. The extending portion 16b constitutes a shape that extends continuously in a straight line. Hereinafter, for convenience of explanation, the first extension portion 16a and the second extension portion 16b are collectively referred to as "first straight line portion 17a".

As shown in FIG. 4, the third extension portion 16c and the fourth extension portion 16d extend in opposite directions from the center point O1 as the relay point 15, and the third extension portion 16c and the fourth extension portion 16c and the fourth extend portion 16d. The extending portion 16d constitutes a shape that extends continuously in a straight line. Hereinafter, for convenience of explanation, the third extension portion 16c and the fourth extension portion 16d will be collectively referred to as “second straight line portion 17b”.

As shown in FIG. 4, the fifth extension portion 16e and the sixth extension portion 16f extend in opposite directions from the center point O1 as the relay point 15, and the fifth extension portion 16e and the sixth extension portion 16e and the sixth extend portion 16e. The extending portion 16f constitutes a shape that extends continuously in a straight line. Hereinafter, for convenience of explanation, the fifth extension portion 16e and the sixth extension portion 16f are collectively referred to as a “third straight portion 17c”.

As described above, the asterisk protrusions as the first unit pattern 13 of the present embodiment intersect at the center point O1 as the relay point 15, the first straight line portion 17a, the second straight line portion 17b, and the third straight line portion 17c. It is composed of.

The six extension portions 16 form an angle of 60 ° with the adjacent extension portions 16. In other words, the six extension portions 16 extend radially from the center point O1 as the relay point 15.

FIG. 5 is a diagram showing cross sections of the first straight line portion 17a, the second straight line portion 17b, and the third straight line portion 17c of the first unit pattern 13 of the present embodiment, which are orthogonal to the extending direction. Specifically, it is a cross-sectional view taken along the line II of FIG. As shown in FIG. 5, in the asterisk projection as the first unit pattern 13, the first straight line portion 17a, the second straight line portion 17b, and the third straight line portion 17c have a substantially isosceles triangle shape having a flat top. Has been done. Hereinafter, the top of the first straight line portion 17a will be referred to as the “first top portion 18a”, the top of the second straight line portion 17b will be referred to as the “second top portion 18b”, and the top of the third straight line portion 17c will be referred to as the “third top portion 18c”.

The height from the base portion 12 to each of the first top portion 18a, the second top portion 18b, and the third top portion 18c (hereinafter referred to as “protruding height H1”) is 0.1 mm or more and 1.0 mm or less. 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. 5, in the asterisk projection as the first unit pattern 13 of the present embodiment, the base portion 12 between the first straight line portion 17a and the second straight line portion 17b is flattened. As shown in FIG. 5, the base portion 12 between the second straight line portion 17b and the third straight line portion 17c has a curved surface shape. By making the base portion 12 curved, the reflection of the incident light is suppressed, the contrast with the outside of the mark element 11 is increased, and the visibility is improved.

The first side wall surface 19a forming the hypotenuse of the isosceles triangle of the first straight line portion 17a, the second side wall surface 19b forming the hypotenuse of the isosceles triangle of the second straight line portion 17b, and the third straight line portion 17c. The third side wall surface 19c forming the hypotenuse of the isosceles triangle is between the side wall surfaces on both sides in a cross-sectional view (see FIG. 5) orthogonal to the extending direction of each of the first straight line portion 17a to the third straight line portion 17c. The width W, which is the distance, widens from the top side toward the base portion 12. The first side wall surface 19a, the second side wall surface 19b, and the third side wall surface 19c form an angle θ with respect to the virtual vertical surface F with respect to the base portion 12. The angle θ is preferably in the range of 5 ° to 30 °, 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 19a to the third side wall surface 19c returning to the outside from between the extending portions 16 increases, and the improvement in visibility is small. Become. That is, the light is reflected, the difference in contrast from the outside of the mark element 11 becomes small, and the improvement in visibility is reduced. On the other hand, if the angle θ is smaller than 5 °, the extending portion 16 tends to fall down. Therefore, in consideration of the effect of suppressing the reflected light of the light incident between the extending portions 16 from returning to the outside from between the extending portions 16 and the durability of the extending portion 16, the angle θ is 5 °. It is preferably ~ 30 °.

Further, in the extending portion 16, the protruding height H1 may be 0.8 to 6 times the maximum width Wmax (distance between the bases of the side wall surfaces in the base portion 12) at the base position of the isosceles triangle. preferable. When the protrusion height H1 is smaller than 0.8 times the maximum width Wmax, the ratio of the reflected light from the first side wall surface 19a to the third side wall surface 19c returning to the outside from between the extending portions 16 increases, and the light can be visually recognized. There is less improvement in sex. That is, the light is reflected, the difference in contrast from the outside of the mark element 11 becomes small, and the improvement in visibility is reduced. On the other hand, when the protrusion height H1 is larger than 6 times the maximum width Wmax, the first side wall surface 19a to the third side wall surface 19c have an angle close to perpendicular to the base portion 12, so that the extension portion 16 collapses. It will be easier. Therefore, in consideration of the effect of suppressing the reflected light of the light incident between the extending portions 16 from returning to the outside from between the extending portions 16 and the durability of the extending portion 16, the protruding height H1 is the base. It is preferably 0.8 to 6 times the length B1.

The second unit pattern 14 of the present embodiment includes an extension portion 21 that protrudes from the base portion 12 and extends from the relay point 20 in a plurality of directions in a plan view. The second unit pattern 14 of the present embodiment is an asterisk protrusion having the same shape and size as the first unit pattern 13, but as the first unit pattern 13 in the tire side view (see FIGS. 2 to 4). It is tilted at a different angle from the asterisk protrusion of. Specifically, as shown in FIG. 4, the asterisk protrusion as the second unit pattern 14 is inclined at an angle of rotating the asterisk protrusion as the first unit pattern 13 by 30 ° about the center point O1. ..

Specifically, the asterisk projection as the second unit pattern 14 of the present embodiment includes an extension portion 21 having the same shape extending linearly from the center point O2 as the relay point 20 in different directions. There is. More specifically, the asterisk protrusion as the second unit pattern 14 of the present embodiment is the first extension portion 21a as six extension portions 21 extending in different directions from the center point O2 as the relay point 20. , A second extension section 21b, a third extension section 21c, a fourth extension section 21d, a fifth extension section 21e, and a sixth extension section 21f. Hereinafter, when the six extension portions 21 are described without distinction, they are simply described as "extension portion 21".

As shown in FIG. 4, the first extension portion 21a and the second extension portion 21b extend in opposite directions from the center point O2 as the relay point 20, and the first extension portion 21a and the second extension portion 21a and the second extension portion 21b extend from each other in opposite directions. The extending portion 21b constitutes a shape that extends continuously in a straight line. Hereinafter, for convenience of explanation, the first extension portion 21a and the second extension portion 21b will be collectively referred to as "first straight portion 22a".

As shown in FIG. 4, the third extension portion 21c and the fourth extension portion 21d extend in opposite directions from the center point O2 as the relay point 20, and the third extension portion 21c and the fourth extension portion 21c and the fourth extend portion 21d. The extending portion 21d constitutes a shape that extends continuously in a straight line. Hereinafter, for convenience of explanation, the third extension portion 21c and the fourth extension portion 21d will be collectively referred to as “second straight line portion 22b”.

As shown in FIG. 4, the fifth extension portion 21e and the sixth extension portion 21f extend in opposite directions from the center point O2 as the relay point 20, and the fifth extension portion 21e and the sixth extension portion 21e and the sixth extend portion 21e. The extending portion 21f constitutes a shape that extends continuously in a straight line. Hereinafter, for convenience of explanation, the fifth extension portion 21e and the sixth extension portion 21f are collectively referred to as a “third straight portion 22c”.

As described above, the asterisk protrusions as the second unit pattern 14 of the present embodiment intersect at the center point O2 as the relay point 20, the first straight line portion 22a, the second straight line portion 22b, and the third straight line portion 22c. It is composed of.

The six extension portions 21 form an angle of 60 ° with the adjacent extension portions 21. In other words, the six extension portions 21 extend radially from the center point O2 as the relay point 20.

FIG. 6 is a diagram showing cross sections of the first straight line portion 22a, the second straight line portion 22b, and the third straight line portion 22c of the second unit pattern 14 of the present embodiment, which are orthogonal to the extending direction. Specifically, it is a cross-sectional view of the II-II cross section of FIG. As shown in FIG. 6, in the asterisk projection as the second unit pattern 14, the first straight line portion 22a, the second straight line portion 22b, and the third straight line portion 22c have a substantially isosceles triangle shape having a flat top. Has been done. Hereinafter, the top of the first straight line portion 22a will be referred to as "first top portion 23a", the top of the second straight line portion 22b will be referred to as "second top portion 23b", and the top of the third straight line portion 22c will be referred to as "third top portion 23c".

The protrusion height H1, which is the height from the base portion 12 to each of the first top portion 23a, the second top portion 23b, and the third top portion 23c, is 0.1 mm or more, similar to the protrusion height H1 in the first unit pattern 13. It is set to 1.0 mm or less. 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. 6, in the asterisk projection as the second unit pattern 14 of the present embodiment, the base portion 12 between the first straight line portion 22a and the second straight line portion 22b is flattened. As shown in FIG. 6, the base portion 12 between the second straight line portion 22b and the third straight line portion 22c has a curved surface shape. By making the base portion 12 curved, the reflection of the incident light is suppressed, the contrast with the outside of the mark element 11 is increased, and the visibility is improved.

The first side wall surface 24a forming the hypotenuse of the isosceles triangle of the first straight line portion 22a, the second side wall surface 24b forming the hypotenuse of the isosceles triangle of the second straight line portion 22b, and the third straight line portion 22c. The third side wall surface 24c forming the hypotenuse of the isosceles triangle is between the side wall surfaces on both sides in a cross-sectional view (see FIG. 6) orthogonal to the extending direction of each of the first straight line portion 22a to the third straight line portion 22c. The width W, which is a distance, is configured to widen from the top side toward the base portion 12. The first side wall surface 24a, the second side wall surface 24b, and the third side wall surface 24c form an angle θ with respect to the virtual vertical surface F with respect to the base portion 12. The angle θ is preferably in the range of 5 ° to 30 °, and more preferably in the range of 15 ° to 25 °, for the same reason as the angle θ in the first unit pattern 13.

Further, in the extending portion 21, the protruding height H1 is the maximum width Wmax at the base position of the isosceles triangle (the side wall surface of the base portion 12) for the same reason as the protruding height H1 in the first unit pattern 13. The distance between the bases) is preferably 0.8 to 6 times.

As shown in FIG. 4, the above-mentioned first unit pattern 13 and second unit pattern 14 are arranged so as to fill the entire mark element 11.

Specifically, a plurality of first unit patterns 13 for each of the plurality of mark elements 11 of the present embodiment are arranged along a linear direction D (direction substantially equal to the tire radial direction B in FIG. 4). Further, also for the second unit pattern 14 of each of the plurality of mark elements 11 of the present embodiment, as in the first unit pattern 13, along the linear direction D (direction substantially equal to the tire radial direction B in FIG. 4). Multiple are arranged.

Further, a plurality of first unit patterns 13 of each of the plurality of mark elements 11 of the present embodiment are arranged even in a direction substantially orthogonal to the straight direction D. Further, a plurality of second unit patterns 14 for each of the plurality of mark elements 11 of the present embodiment are also arranged in a direction substantially orthogonal to the straight direction D.

By regularly arranging the first unit pattern 13 and the second unit pattern 14 in a predetermined direction in this way, even if the first unit pattern 13 and the second unit pattern 14 have no anisotropy, the first unit pattern 14 is first. The arrangement of the unit pattern 13 and the second unit pattern 14 can be simplified. Not limited to the configuration of the present embodiment, when a unit pattern having no anisotropy is used, it is preferable to use a repeating pattern formed by regularly arranging the unit patterns. In this way, even if a unit pattern having no anisotropy is used, a large area can be easily filled with the unit pattern.

The tips of the first extension portion 16a and the second extension portion 16b of the asterisk protrusion as the first unit pattern 13 are the third extension portions 21c and the fifth of the asterisk protrusion as the adjacent second unit pattern 14. It is arranged at a position sandwiched between the extension portion 21e or between the fourth extension portion 21d and the sixth extension portion 21f. The tips of the first extension portion 21a and the second extension portion 21b of the asterisk protrusion as the second unit pattern 14 are the fourth extension portions 16d and the sixth of the asterisk protrusion as the adjacent first unit pattern 13. It is arranged at a position sandwiched between the extension portion 16f or between the third extension portion 16c and the fifth extension portion 16e.

In the adjacent first unit pattern 13 and the second unit pattern 14, the distance between the center point O1 as the relay point 15 and the center point O2 as the relay point 20 (hereinafter referred to as “spacing P”) is 0. It is 2 mm or more and 3.0 mm or less. Further, in the first unit pattern 13, the length from the tip of the first extension portion 16a to the tip of the second extension portion 16b, from the tip of the third extension portion 16c to the tip of the fourth extension portion 16d. The length and the length from the tip of the fifth extension portion 16e to the tip of the sixth extension portion 16f are equal to each other, which is the longest length of the first unit pattern 13 in the side view of the tire. This length is hereinafter referred to as "straight line extending length L". The straight line extension length L is set longer than the interval P.

The length from the tip of the first extension 21a to the tip of the second extension 21b, the length from the tip of the third extension 21c to the tip of the fourth extension 21d, and the fifth. The length from the tip of the extending portion 21e to the tip of the sixth extending portion 21f is the longest length of the second unit pattern 14 in the side view of the tire, and is the linear extending length of the first unit pattern 13. It is the same length as L.

When the above-mentioned interval P is less than 0.2 mm, the lengths of the extending portions 16 and 21 become short, and it is difficult to secure the moldability of the first unit pattern 13 and the second unit pattern 14 at the time of manufacturing. On the other hand, when the interval P exceeds 3.0 mm, the influence of the reflected light on the base portion 12 is large, and it becomes difficult for the first unit pattern 13 and the second unit pattern 14 to form a contrast with the surroundings. The first unit pattern 13 and the second unit pattern 14 are densely arranged so that the influence of the reflected light on the base portion 12 is small, and the interval P is 1.0 mm or less, more preferably 0.8 mm or less. do. By doing so, since the light reflected by the base portion 12 can be further reduced, the mark element 11 can be made to appear blacker, the contrast with respect to the periphery of the mark element 11 can be further increased, and the mark element 11 can be further reduced. Visibility is improved. However, the adjacent first unit pattern 13 and the second unit pattern 14 are not continuous in the portion where the connecting portion 60, which will be described later, does not intervene, and are arranged apart from each other.

The mark element 11 of the present embodiment includes the first unit pattern 13 and the second unit pattern 14, but only one of the unit patterns is formed on the base portion 12. May be good. However, by using a plurality of types of unit patterns as in the present embodiment, it becomes easy to arrange the unit patterns densely so that the area of the base portion 12 becomes small. Therefore, it becomes easy to realize the mark element 11 having higher visibility.

Further, although each of the first unit pattern 13 and the second unit pattern 14 of the present embodiment is composed of asterisk protrusions, the number of extending portions extending from the relay point in a plurality of different directions is not limited to six, and 2 Only one or more is required.

The connecting portion 60 of the present embodiment connects the adjacent first unit pattern 13 and the second unit pattern 14. In the present embodiment, any first unit pattern 13 is connected to at least one adjacent second unit pattern 14 via a connecting portion 60. More specifically, in the present embodiment, the sixth extension portion 16f of the arbitrary first unit pattern 13 is connected to the fifth extension portion 21e of the adjacent second unit pattern 14 by the connecting portion 60. .. Further, in the present embodiment, the third extension portion 16c of the arbitrary first unit pattern 13 is connected to the fourth extension portion 21d of the adjacent second unit pattern 14 by the connecting portion 60. However, the extension portion 16 of the first unit pattern 13 and the extension portion 21 of the second unit pattern 14 to which the connecting portion 60 is connected are not limited to the configuration of the present embodiment, and another extension portion 16 21 may be connected to each other.

The connecting portion 60 of the present embodiment is a straight line formed by extending one extending portion 16 of the first unit pattern 13 or one extending portion 21 of the second unit pattern 14. It has a similar structure. However, it is formed by extending and continuing one extension portion 16 of the first unit pattern 13 and one extension portion 21 of the second unit pattern 14, for example, a predetermined value such as 90 °. It may have a bent shape that bends at an angle. Further, the connecting portion 60 is not limited to a linear shape or a bent shape, and may be configured to be curved in an arc shape, for example.

The plurality of first unit patterns 13 in each mark element 11 are continuous via the connecting portion 60 and the second unit pattern 14 connected by the connecting portion 60. In other words, the plurality of second unit patterns 14 in each mark element 11 are continuous via the connecting portion 60 and the first unit pattern 13 connected by the connecting portion 60. That is, the first unit pattern 13 and the second unit pattern 14 are connected by the connecting portion 60 and are connected in a zigzag shape in the above-mentioned linear direction D. The first unit pattern 13 and the second unit pattern 14 are continuous from one end side to the other end side in the above-mentioned linear direction D.

By providing the connecting portion 60, the first unit pattern 13 and the second unit pattern 14 are connected, the first unit pattern 13 and the second unit pattern 14 support each other, and the first unit pattern 13 and the second unit pattern 14 are provided. The collapse of each unit pattern is suppressed, and the durability of each unit pattern can be improved.

Further, if the first unit pattern 13 and the second unit pattern 14 are connected along an arbitrary linear direction (straight direction D in the present embodiment) as in the connecting portion 60 of the present embodiment, they are adjacent to each other. A tire using a mold as compared with a configuration in which the first unit pattern 13 and the second unit pattern 14 are connected in different directions by connecting portions at irregular positions and there is no portion connected along a straight line direction. At the time of vulcanization molding of No. 1, the rubber flowability can be improved. That is, the first unit pattern 13, the second unit pattern 14, and the continuous groove on the inner surface of the mold which is the corresponding shape of the connecting portion 60 allow air to escape to the outside of each mark element 11 during vulcanization molding. Can be done. Therefore, air is less likely to accumulate in the mold during vulcanization molding, rubber flowability can be improved, and the occurrence of defective products can be suppressed.

Further, in each mark element 11 of the present embodiment, since the adjacent first unit pattern 13 and the second unit pattern 14 are regularly connected in a predetermined direction by the connecting portion 15, each mark element 11 The shade of black inside is unlikely to vary, and the inside of each mark element 11 can be made to appear uniformly black.

The plurality of first unit patterns 13 arranged in a direction substantially orthogonal to the linear direction D are not continuous via the connecting portion 60 and the second unit pattern 14 connected by the connecting portion 60. .. Further, the plurality of second unit patterns 14 arranged in a direction substantially orthogonal to the linear direction D are not continuous via the connecting portion 60 and the first unit pattern 13 connected by the connecting portion 60. .. By doing so, the air flow during vulcanization molding can be more optimized, and the air can be released to the outside of each mark element 11 more efficiently. As a result, the rubber flowability during vulcanization molding can be further improved, and the occurrence of defective products can be further suppressed.

Next, the difference in the configuration of the plurality of mark elements 11 will be described.

FIG. 7 is an enlarged view of the character portions “C” to “E” in FIG. 3 in an enlarged manner. As shown in FIG. 7, when an arbitrary reference straight line BL is set in a plan view, the inclination angles of the plurality of first unit patterns 13 of one mark element 11 with respect to the reference straight line BL are substantially equal. The reference straight line BL is not limited to the straight line shown in FIG. 7, and may be any straight line, but in the present embodiment, the reference straight line BL shown in FIG. 7 will be used for description.

Specifically, when focusing on the character portion "C" as the mark element 11 of FIG. 7, all the first unit patterns 13 in the character portion "C" are substantially equal to the reference straight line BL. It is tilted at an angle. In the present embodiment, the inclination angle α of the character portion “C” with respect to the reference straight line BL of the first unit pattern 13 is indicated by the angle of the first straight line portion 17a of the first unit pattern 13, but the character portion “C” It suffices if the same parts of the plurality of first unit patterns 13 of "C" can be compared with each other, and the present invention is not limited to the first straight line portion 17a.

The same applies to the case where the character portion “D” as the mark element 11 in FIG. 7 is focused on. All the first unit patterns 13 in the character portion "D" are inclined at substantially the same angle with respect to the reference straight line BL. In the present embodiment, the inclination angle β of the character portion “D” with respect to the reference straight line BL of the first unit pattern 13 is indicated by the angle of the first straight line portion 17a of the first unit pattern 13, but the character portion “D” It suffices if the same parts of the plurality of first unit patterns 13 of "D" can be compared with each other, and the present invention is not limited to the first straight line portion 17a.

Further, the same applies when paying attention to the character portion “E” as the mark element 11 in FIG. 7. All the first unit patterns 13 in the character portion "E" are inclined at substantially the same angle with respect to the reference straight line BL. In the present embodiment, the inclination angle γ of the character portion “E” with respect to the reference straight line BL of the first unit pattern 13 is indicated by the angle of the first straight line portion 17a of the first unit pattern 13, but the character portion “E”. It suffices if the same parts of the plurality of first unit patterns 13 of "E" can be compared with each other, and the present invention is not limited to the first straight line portion 17a.

Although not shown, the same applies to the character portions "A", "B", "F", and "G" as one mark element 11.

In this way, by providing the first unit pattern 13 in each mark element 11, the mark element 11 is compared with the case where the unit pattern as in the present embodiment is used as the background of the mark element. It can make itself stand out. Further, the mark element 11 itself can be formed larger than the case where the unit pattern as in the present embodiment is used as the background of the mark element. Further, the region forming the first unit pattern 13 can be narrowed, and the manufacturing process of the mold for transferring the first unit pattern 13 can be simplified.

Further, by making the inclination angles of the plurality of first unit patterns 13 of each mark element 11 uniform, it is possible to prevent the visibility from being lowered due to the variation of the reflected light in one mark element 11. can.

Further, as shown in FIG. 7, the inclination angle of the first unit pattern 13 in one mark element 11 with respect to the reference straight line BL is the same as the inclination angle of the first unit pattern 13 in the other mark element 11 with respect to the reference line BL. Approximately equal.

Specifically, when focusing on the character part "C" as the mark element 11 of FIG. 7 and the character part "D" as the other mark element 11 of FIG. 7, the character part "C" The inclination angle α with respect to the reference straight line BL of the first unit pattern 13 in the character portion “D” is substantially equal to the inclination angle β with respect to the reference straight line BL of the first unit pattern 13 in the character portion “D”.

Further, when focusing on the character part "C" as the mark element 11 of FIG. 7 and the character part "E" as the other mark element 11 of FIG. 7, the inside of the character part "C" The inclination angle α of the first unit pattern 13 with respect to the reference straight line BL is substantially equal to the inclination angle γ of the first unit pattern 13 with respect to the reference straight line BL in the character portion “E”.

Further, when focusing on the character part "D" as the mark element 11 of FIG. 7 and the character part "E" as the other mark element 11 of FIG. 7, the inside of the character part "D" The inclination angle β of the first unit pattern 13 with respect to the reference straight line BL is substantially equal to the inclination angle γ of the first unit pattern 13 with respect to the reference straight line BL in the character portion “E”.

Comparing the mark elements 11 formed at different positions in the tire circumferential direction C in this way, the inclination angles of the first unit pattern 13 with respect to the reference straight line BL are substantially equal. That is, the plurality of mark elements 11 formed at different positions in the tire circumferential direction C are configured to have substantially the same inclination angle with respect to the reference straight line BL of the first unit pattern 13. Therefore, it is unlikely that the reflected light will vary due to the first unit pattern 13 between the mark elements 11 arranged at different positions in the tire circumferential direction C. As a result, it is possible to prevent the visibility from being significantly different due to the difference in the position of each mark element 11 in the tire circumferential direction C, and even if a plurality of mark elements 11 are formed at different positions in the tire circumferential direction C, one It is possible to realize a sensational visibility. Further, even if the plurality of mark elements 11 are formed at different positions in the tire circumferential direction C, it is not necessary to adjust the inclination angle of the first unit pattern 13 according to each of the plurality of mark elements 11. Therefore, the work of transferring the first unit pattern 13 to the position corresponding to the mark element 11 on the inner surface of the mold becomes easy. That is, the first unit pattern 13 that is inclined at the same inclination angle regardless of the position of the tire circumferential direction C is uniformly applied to all the plurality of mark elements 11 formed at different positions in the tire circumferential direction C. Can be applied to. Therefore, the step of transferring the first unit pattern 13 to the position of the inner surface of the mold corresponding to each mark element 11 is simpler than the case where the inclination angle of the first unit pattern 13 differs depending on the position of the tire circumferential direction C. The transfer work can be made more efficient. For example, the inclination angle of the first unit pattern 13 of each mark element 11 is not individually set according to the position of the inner surface of the mold corresponding to each mark element 11, but the mold corresponding to a plurality of mark elements 11. It can be set at all positions on the inner surface at the same time.

Although the description is omitted, the second unit pattern 14 is the same as the first unit pattern 13 described above. That is, when an arbitrary reference straight line BL is set in a plan view, the inclination angles of the plurality of second unit patterns 14 of one mark element 11 with respect to the reference straight line BL are substantially equal. Further, the inclination angle of the second unit pattern 14 with respect to the reference straight line BL in one mark element 11 is substantially equal to the inclination angle of the second unit pattern 14 with respect to the reference straight line BL in the other mark element 11.

Further, as shown in FIGS. 5 and 6, each of the plurality of mark elements 11 of the mark 10 of the present embodiment is provided on the bottom surface 40a of the recess 40 formed on the tire side outer surface 32 of the tire outer surface. There is. More specifically, a plurality of recesses 40 are formed on the tire side outer surface 32 of the tire outer surface of the present embodiment. Each of the plurality of mark elements 11 of the mark 10 of the present embodiment is provided on the bottom surface 40a of the separate recess 40. More specifically, the shape of the edge of the recess 40 of the present embodiment is a shape that follows the contour of each mark element 11. That is, the tire side outer surface 32 of the present embodiment is formed with a plurality of recesses 40 recessed so as to have the shapes of the letters "A" to "G" as the plurality of mark elements 11. The base portion 12, the plurality of first unit patterns 13, the plurality of second unit patterns 14, and the connecting portion 60 are provided on the bottom surface 40a of the recess 40.

By providing the plurality of mark elements 11 of the mark 10 on the bottom surface 40a of the recess 40 formed on the outer surface of the tire, even if the outer surface of the tire may slide, the plurality of mark elements in the recess 40 may be slid. 11 is hard to damage. Therefore, damage to the mark element 11 can be suppressed.

Further, since each of the plurality of mark elements 11 is provided on the bottom surface 40a of the separate recess 40, the outline of each mark element 11 becomes clearer, and the visibility of the mark element 11 can be further enhanced. can. In particular, in the present embodiment, since the edge shape of each recess 40 has a shape that follows the contour of each mark element 11, the contour of each mark element 11 becomes clearer. Thereby, the visibility of each mark element 11 can be further improved.

The recess 40 is recessed in the tire width direction A by a maximum of 1.5 mm from the tire side outer surface 32. Specifically, the maximum depth is the depth from the edge of the recess 40 to the base portion 12 located on the bottom surface 40a.

Further, the first top 18a to the third top 18c (see FIG. 5) of the plurality of first unit patterns 13 in each of the plurality of mark elements 11 are located in the recess 40. Further, the first top 23a to the third top 23c (see FIG. 6) of the plurality of second unit patterns 14 in each of the plurality of mark elements 11 are located in the recess 40. As described above, the first top 18a to the third top 18c (see FIG. 5) of the first unit pattern 13 and the first top 23a to the third top 23c (see FIG. 6) of the second unit pattern 14 are recessed. By making the configuration located inside the 40, the mark element 11 in the recess 40 is less likely to be damaged. Therefore, damage to the mark element 11 can be further suppressed.

The tire according to the present invention is not limited to the specific configuration shown in the above-described embodiment, and can be variously modified and modified without departing from the scope of claims.

The present invention relates to a tire.

1: Tire, 1a: Tread part, 1b: Tire side part, 1b1: Side wall part, 1b2: Bead part, 2: Applicable rim, 2a: Rim seat part, 2b: Rim flange part, 3: Bead member, 3a: Bead core , 3b: bead filler, 4: carcass, 4a: carcass ply, 6: belt, 7: tread rubber, 7a: circumferential groove, 8: side rubber, 9: inner liner, 10: mark, 11: mark element, 12 : Base part, 13: 1st unit pattern, 14: 2nd unit pattern, 15: Relay point of 1st unit pattern, 16: Extension part of 1st unit pattern, 16a: 1st extension of 1st unit pattern Part, 16b: 2nd extension part of the 1st unit pattern, 16c: 3rd extension part of the 1st unit pattern, 16d: 4th extension part of the 1st unit pattern, 16e: 5th part of the 1st unit pattern Extension part, 16f: 6th extension part of the 1st unit pattern, 17a: 1st straight part of the 1st unit pattern, 17b: 2nd straight part of the 1st unit pattern, 17c: 3rd straight part of the 1st unit pattern Straight line part, 18a: 1st top of the 1st straight part of the 1st unit pattern, 18b: 2nd top of the 2nd straight part of the 1st unit pattern, 18c: 3rd top of the 3rd straight part of the 1st unit pattern , 19a: 1st side wall surface of the 1st straight line part of the 1st unit pattern, 19b: 2nd side wall surface of the 1st straight line part of the 1st unit pattern, 19c: 3rd side of the 1st straight line part of the 1st unit pattern. Wall surface, 20: Relay point of the second unit pattern, 21: Extension part of the second unit pattern, 21a: First extension part of the second unit pattern, 21b: Second extension part of the second unit pattern, 21c : 3rd extension part of the 2nd unit pattern, 21d: 4th extension part of the 2nd unit pattern, 21e: 5th extension part of the 2nd unit pattern, 21f: 6th extension part of the 2nd unit pattern , 22a: 1st straight part of 2nd unit pattern, 22b: 2nd straight part of 2nd unit pattern, 22c: 3rd straight part of 2nd unit pattern, 23a: 1st straight part of 2nd unit pattern 1 top, 23b: 2nd top of 2nd straight part of 2nd unit pattern, 23c: 3rd top of 3rd straight part of 2nd unit pattern, 24a: 1st side of 1st straight part of 2nd unit pattern Wall surface, 24b: second side wall surface of the first straight line portion of the second unit pattern, 24c: first 3rd side wall surface of the 1st straight part of the 2-unit pattern, 31: tread outer surface, 32: tire side outer surface, 32a: sidewall outer surface, 32b: bead outer surface, 40: recess, 40a: bottom surface, 50: inter-element part, 60: Connecting part, A: Tire width direction, B: Tire radial direction, C: Tire circumferential direction, D: Straight line direction, F: Virtual vertical plane with respect to the base part, L: Straight line extension length, O: Tire center Axis, W: Width between side wall surfaces on both sides, P: Spacing between center points, B1: Base length of straight line, H1: Protruding height of straight line, O1, O2: Center point, BL: Reference straight line, CL: Tire equatorial plane, TE: Tread end, α, β, γ: Tilt angle, θ: Angle with respect to virtual vertical plane with respect to base

Claims (5)

A tire in which a plurality of mark elements of the mark including letters, symbols, figures or patterns are formed on the outer surface of the tire at different positions in the tire circumferential direction.
Each of the plurality of mark elements
With the base
A plurality of unit patterns including an extension portion protruding from the base portion and extending in a plurality of directions from a relay point in a plan view are provided.
The unit pattern of each of the plurality of mark elements has the same shape.
When any one reference line is set in a plan view, the inclination angles of the plurality of unit patterns of one mark element with respect to the reference line are substantially equal, and the unit in one mark element. A tire whose tilt angle of the pattern with respect to the reference straight line is substantially equal to the tilt angle of the unit pattern with respect to the reference straight line in the other mark elements. The tire according to claim 1, wherein the base portion and the plurality of unit patterns in each of the plurality of mark elements are provided on the bottom surface of a recess formed on the outer surface of the tire. A plurality of the recesses are formed on the outer surface of the tire.
The tire according to claim 2, wherein the base portion and the plurality of unit patterns of the plurality of mark elements are provided on the bottom surface of the separate recesses. The tire according to claim 2 or 3, wherein the top of the plurality of unit patterns of each of the plurality of mark elements is located in the recess. When the unit pattern is the first unit pattern, each of the plurality of mark elements includes a plurality of second unit patterns whose inclination angles with respect to the reference straight line are different from those of the first unit pattern in a plan view.
The inclination angles of the plurality of second unit patterns of one of the mark elements with respect to the reference line are substantially equal, and the inclination angles of the second unit pattern of one of the mark elements with respect to the reference line are other. The tire according to claim 1 to 4, which is substantially equal to the inclination angle of the second unit pattern in the mark element with respect to the reference straight line.

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