tire

Abstract

To provide a tire that can improve the blackening performance and visual angle uniformity performance of the ridge area. [Solution] This tire has a ridge region 5 on the tire side surface. The ridge region 5 consists of a plurality of annular ridges 52 having an annular structure in a plan view of the tire side surface. The plurality of annular ridges 52 includes a plurality of ridge units, each consisting of one first annular ridge and a plurality of second annular ridges intersecting the first annular ridge. The plurality of ridge units are arranged in a continuous manner such that adjacent ridge units share one or two of the plurality of second annular ridges with one another.

Description

Technical Field

[0001] The present invention relates to a tire, and more particularly to a tire capable of improving the blackening performance and viewing angle uniformity performance of a ridge region.

Background Art

[0002] In recent tires, a configuration is adopted in which a logo such as a side brand is blackened using a ridge region composed of a plurality of ridges to improve the visibility of the logo. As a conventional tire adopting such a configuration, the technique described in Patent Document 1 is known. On the other hand, there is also a problem that the blackening effect of the ridge region when the tire side surface is viewed from different directions should be made uniform. As a conventional tire regarding such a problem, the technique described in Patent Document 2 is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=�8]] An object of the present invention is to provide a tire capable of improving the blackening performance and viewing angle uniformity performance of a ridge region.

Means for Solving the Problems

[0005] To achieve the above objective, the tire according to this invention is a tire having a ridge region on the tire side surface, wherein the ridge region consists of a plurality of annular ridges having an annular structure in a plan view of the tire side surface, and the plurality of annular ridges includes a plurality of ridge units, each consisting of one first annular ridge and a plurality of second annular ridges intersecting the one first annular ridge, and the plurality of ridge units are arranged continuously such that adjacent ridge units share one or two of the plurality of second annular ridges with each other, or intersect or connect with each other. [Effects of the Invention]

[0006] In the tire according to this invention, (1) since the tire has ridge regions on the tire side surface, the light absorption rate in the ridge regions is relatively higher than the light absorption rate in other regions. This has the advantage that the ridge regions are relatively blackened, and the contrast of the tire side surface is made clearer. Also, (2) since the ridge region consists of multiple annular ridges having an annular structure in a plan view of the tire side surface, the diffuse reflection of light between the ridges is promoted, which has the advantage that the uniformity of the viewing angle of the ridge region, that is, the uniformity of the blackening effect of the ridge region when the tire side surface is viewed from different directions, is improved. Also, (3) since the multiple annular ridges include multiple ridge units consisting of one first annular ridge and multiple second annular ridges intersecting the one first annular ridge, and the multiple ridge units are arranged continuously, the arrangement density of annular ridges is increased, improving the blackening effect of the ridge region, and also has the advantage that the laser processing of the vulcanization molding die for forming the ridge region 5 is made easier. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a cross-sectional view of a tire in the meridian direction, showing a tire according to an embodiment of this invention. [Figure 2] Figure 2 is a plan view showing the tire sidewall of the tire described in Figure 1. [Figure 3]Figure 3 is an enlarged view showing the markings on the tire sidewall as described in Figure 2. [Figure 4] Figure 4 is an explanatory diagram showing the ridge region of the tire sidewall as described in Figure 2. [Figure 5] Figure 5 is an explanatory diagram showing the ridge region of the tire sidewall as described in Figure 2. [Figure 6] Figure 6 is an explanatory diagram showing the ridge region of the tire sidewall as described in Figure 2. [Figure 7] Figure 7 is an explanatory diagram showing the ridge region of the tire sidewall as described in Figure 2. [Figure 8] Figure 8 is an explanatory diagram showing the machining method for the ridge region described in Figure 5. [Figure 9] Figure 9 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 10] Figure 10 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 11] Figure 11 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 12] Figure 12 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 13] Figure 13 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 14] Figure 14 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 15] Figure 15 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 16] Figure 16 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 17] Figure 17 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 18] Figure 18 is an explanatory diagram showing a modified example of the ridge region described in Figure 5. [Figure 19] Figure 19 is a diagram showing the results of a performance test of a tire according to an embodiment of this invention.

Best Mode for Carrying Out the Invention

[0008] Hereinafter, this invention will be described in detail with reference to the drawings. Note that the invention is not limited by this embodiment. Also, the components of this embodiment include those that can be replaced and are self-evidently replaceable while maintaining the identity of the invention. Further, a plurality of modification examples described in this embodiment can be arbitrarily combined within the scope self-evident to those skilled in the art.

[0009] [Tire] FIG. 1 is a cross-sectional view in the tire meridian direction showing a tire 1 according to an embodiment of this invention. The figure shows a cross-sectional view of one-side region in the tire radial direction of the tire 1 mounted on a rim 20. In this embodiment, as an example of the tire, a pneumatic radial tire for a passenger car will be described.

[0010] In the figure, the cross-section in the tire meridian direction is defined as the cross-section when the tire is cut by a plane including the tire rotation axis (not shown). Also, the tire equatorial plane CL is defined as a plane passing through the midpoint of the tire cross-sectional width defined by JATMA and perpendicular to the tire rotation axis. Also, the tire width direction is defined as the direction parallel to the tire rotation axis, and the tire radial direction is defined as the direction perpendicular to the tire rotation axis. Also, point T is the tire ground end, and point Ac is the tire maximum width position.

[0011] The tire 1 has an annular structure centered on the tire rotation axis, and includes a pair of bead cores 11, 11, a pair of bead fillers 12, 12, a carcass layer 13, a belt layer 14, a tread rubber 15, a pair of sidewall rubbers 16, 16, and a pair of rim cushion rubbers 17, 17 (see FIG. 1).

[0012] Each pair of bead cores 11, 11 is made by winding one or more bead wires made of steel in a ring-like and multi-layered manner, and is embedded in the bead portion to form the core of the left and right bead portions. Each pair of bead fillers 12, 12 is positioned on the outer circumference of the pair of bead cores 11, 11 in the radial direction of the tire to reinforce the bead portion.

[0013] The carcass layer 13 has a single-layer structure consisting of one carcass ply or a multi-layer structure consisting of multiple carcass plies stacked together, and is stretched in a toroidal manner between the left and right bead cores 11, 11 to form the tire's skeleton. The ends of the carcass layer 13 are also wrapped around the bead cores 11 and bead filler 12 and secured outward in the tire width direction. The carcass ply of the carcass layer 13 is constructed by covering multiple carcass cords made of steel or organic fiber material (e.g., aramid, nylon, polyester, rayon, etc.) with a coating rubber and rolling it, and has a cord angle of 80 degrees to 100 degrees (defined as the longitudinal inclination angle of the carcass cord with respect to the tire circumferential direction).

[0014] The belt layer 14 is made up of multiple belt plies 141 to 143 stacked together and is arranged around the outer circumference of the carcass layer 13. Each belt ply 141 to 143 includes a pair of cross belts 141 and 142 and a belt cover 143.

[0015] The pair of cross belts 141 and 142 are constructed by covering multiple belt cords made of steel or organic fiber material with coated rubber and rolling them, and have a cord angle (defined as the angle of inclination of the belt cord in the longitudinal direction relative to the circumferential direction of the tire) of 15 degrees or more and 55 degrees or less in absolute value. Furthermore, the pair of cross belts 141 and 142 have cord angles of opposite signs to each other and are laminated with the longitudinal directions of the belt cords intersecting each other (a so-called cross-ply structure). The pair of cross belts 141 and 142 are also laminated and arranged on the radially outer side of the carcass layer 13.

[0016] The belt cover 143 is constructed by covering a belt cover cord made of steel or organic fiber material with coated rubber, and has a cord angle of 0 degrees or more and 10 degrees or less in absolute value. The belt cover 143 is also constructed by wrapping this strip material around the outer circumferential surface of the cross belts 141 and 142 multiple times in a spiral manner in the tire direction. The belt cover 143 is positioned to cover the entire area of ​​the cross belts 141 and 142.

[0017] The tread rubber 15 is arranged on the outer circumference in the radial direction of the carcass layer 13 and the belt layer 14 to form the tread portion of the tire 1. The tread rubber 15 is made of a rubber material with excellent contact characteristics and weather resistance, and is exposed over the entire outer surface of the tire to form the tread surface. The pair of sidewall rubbers 16, 16 are arranged on the outer side in the tire width direction of the carcass layer 13, respectively, to form the left and right sidewall portions. The pair of rim cushion rubbers 17, 17 extend from the inner side in the tire radial direction to the outer side in the tire width direction of the left and right bead cores 11, 11 and the winding portion of the carcass layer 13, forming the rim fitting surface of the bead portion.

[0018] [Tire sidewall] Figure 2 is a plan view showing the tire sidewall of the tire described in Figure 1. Figure 3 is an enlarged view showing the marking portion 2 of the tire sidewall described in Figure 2. In these figures, Figure 2 shows a plan view of the tire 1 as seen from the axial direction, and Figure 3 shows a part of the marking portion 2.

[0019] As shown in Figure 2, the tire 1 has a marking section 2 and a surrounding area 3 on the tire sidewall.

[0020] The mark section 2 includes a mark consisting of letters, figures, or symbols, or a combination thereof, and in particular includes a trademark that functions as an identifying mark indicating a tire manufacturer, tire brand, etc. Multiple mark sections 2, 2 are arranged spaced apart in the circumferential direction of the tire. For example, in the configuration shown in Figure 2, a mark consisting of the string "YOKOHAMA" indicating the tire manufacturer and a logo featuring its initial "Y" is stamped on the surface of the tire sidewall. Furthermore, a pair of mark sections 2, 2 are arranged at opposing positions in the circumferential direction of the tire.

[0021] Furthermore, in Figure 3, the radial height H2 of elements 2A to 2E constituting the emblem 2 is in the range of 0.05 ≤ H2 / SH ≤ 0.80 with respect to the tire cross-sectional height SH, preferably in the range of 0.10 ≤ H2 / SH ≤ 0.70. This improves the visibility of the emblem 2.

[0022] The radial height H2 of elements 2A to 2E is measured as the maximum extent of the extended length of elements 2A to 2E in the radial direction of the tire.

[0023] The tire section height SH is half the difference between the tire's outer diameter and its rim diameter, and is measured under no-load conditions with the tire mounted on a specified rim and under specified internal pressure.

[0024] The specified rim refers to the "applicable rim" specified by JATMA, the "Design Rim" specified by TRA, or the "Measuring Rim" specified by ETRTO. The specified internal pressure refers to the "maximum air pressure" specified by JATMA, the maximum value of "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" specified by TRA, or the "INFLATION PRESSURES" specified by ETRTO. The specified load refers to the "maximum load capacity" specified by JATMA, the maximum value of "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" specified by TRA, or the "LOAD CAPACITY" specified by ETRTO. However, in JATMA, for passenger car tires, the specified internal pressure is 180 [kPa] air pressure, and the specified load is 88 [%] of the maximum load capacity.

[0025] The peripheral region 3 is the area surrounding the emblem portion 2 and is formed on the surface of the tire side portion. This peripheral region 3 may be a smooth surface with a smooth surface, or it may be an uneven surface that has been surface-treated.

[0026] For example, in the configuration shown in Figure 2, the peripheral region 3 is a smooth surface, having a continuous smooth surface without grooves or unevenness. Furthermore, the peripheral region 3 is positioned to surround the entire emblem 2, thereby enhancing the visibility of the emblem 2. Additionally, the peripheral region 3 is formed between a pair of thin ribs 41 and 42 extending in the circumferential direction of the tire, thereby enhancing the design of the tire sidewall. Moreover, a single peripheral region 3 has an annular structure that extends around the entire circumference of the tire sidewall, surrounding the pair of emblem sections 2, 2.

[0027] Furthermore, in the configuration shown in Figure 2, the emblem portion 2 and the surrounding area 3 are positioned radially outward from the tire's maximum width position Ac. More specifically, a pair of thin ribs 41 and 42 extending in the circumferential direction of the tire are arranged in the area from the tire's contact edge T to the tire's maximum width position Ac (see Figure 1), and the emblem portion 2 and the surrounding area 3 are positioned between these thin ribs 41 and 42. This enhances the visibility of the emblem portion 2. However, the configuration is not limited to this; the emblem portion 2 and the surrounding area 3 may also be positioned intersecting the tire's maximum width position Ac, or positioned radially inward from the tire's maximum width position Ac (not shown).

[0028] The tire's maximum width position Ac is defined as the position where the tire's cross-sectional width is at its widest point.

[0029] The tire section width is measured as the straight-line distance between the sidewalls, excluding patterns, lettering, etc., when the tire is mounted on a specified rim, subjected to specified internal pressure, and under no-load conditions.

[0030] The tire contact point T is defined as the position of the maximum width in the axial direction of the tire at the contact surface between the tire and the flat plate when the tire is mounted on a specified rim, subjected to a specified internal pressure, and placed perpendicular to the flat plate in a stationary state, with a load corresponding to a specified load applied.

[0031] The pair of thin ribs 41 and 42 described above have a width of 0.4 mm to 0.8 mm and a height of 0.1 mm to 1.0 mm, and function as a discharge path for residual air during tire vulcanization molding. This suppresses the occurrence of vulcanization failures in the marking area 2 and the surrounding area 3. In addition, in the configuration shown in Figure 2, the thin rib 41 on the outer diameter side is located at the split position of the mold of the tire molding die.

[0032] Furthermore, in Figure 3, the radial height H2 [mm] of the elements 2A to 2E constituting the emblem 2 is in the range of 0.30 ≤ H2 / H4 ≤ 0.80 with respect to the spacing H4 [mm] between the thin ribs 41 and 42 in the radial direction of the tire, preferably in the range of 0.40 ≤ H2 / H4 ≤ 0.70. Also, as shown in Figure 3, it is preferable that the emblem 2 is spaced apart from the pair of thin ribs 41 and 42. This improves the visibility of the emblem 2.

[0033] [Ridge region] Figures 4 to 7 are explanatory diagrams showing the ridge region 5 of the tire sidewall as described in Figure 2. In these figures, Figure 4 shows one element 2A that constitutes the marking portion 2 as described in Figure 3, Figure 5 is an enlarged plan view showing a part of the ridge region 5 as described in Figure 4, Figure 6 is an enlarged view showing a single ridge unit U, and Figure 7 is a cross-sectional view showing the ridge region 5 as described in Figure 5. Here, as an example, a configuration in which the marking portion 2 consists of the ridge region 5 will be described.

[0034] As shown in Figure 7, the ridge region 5 consists of a housing 51 and a plurality of annular ridges 52.

[0035] The housing 51 is a frame-shaped recess formed on the tire side surface, and forms the outline of the mark portion 2 in a plan view of the tire side portion. The depth H51 of the housing 51 (see Figure 7) is in the range of 0.10 [mm] ≤ H51 ≤ 3.00 [mm], and preferably in the range of 0.20 [mm] ≤ H51 ≤ 1.50 [mm].

[0036] The depth H51 of the housing 51 is defined as the distance from the edge of the housing 51 (the surface of peripheral region 3 in Figure 7) to the bottom surface of the housing 51.

[0037] As shown in Figure 7, the annular ridge 52 is a rib-shaped protrusion that extends from the bottom surface of the housing 51 and has a cross-sectional shape that narrows in width towards the top. Also, as shown in Figure 5, multiple annular ridges 52 are arranged in a predetermined direction and filled into the housing 51. The planar shape and arrangement pattern of the annular ridges 52 will be described in detail later.

[0038] For example, in the configuration shown in Figure 3, the trademark portion 2 is formed by a ridge region 5, as shown in Figure 4. Specifically, the logo 2A constituting the trademark portion 2 consists of a combination of multiple parallel-arranged thin lines. The outlines of these thin lines are formed by the edges of the housing 51 (see Figure 7), which will be described later. Similarly, other components constituting the trademark portion 2 (for example, elements 2B to 2E in Figure 3) consist of thick lines representing letters, and the outlines of these thick lines are formed by the edges of the housing 51 (not shown). Also, as shown in Figure 7, multiple annular ridges 52 have a uniform trapezoidal or triangular cross-section. These multiple annular ridges 52 are arranged within the housing 51 in a predetermined arrangement pattern, filling the entire area of ​​the housing 51. As a result, the trademark of the trademark portion 2 is represented by the housing 51 and the multiple annular ridges 52.

[0039] In the above configuration, the tire side surface is provided with a ridge region 5 formed by arranging multiple annular ridges 52. As a result, in a plan view of the tire side surface, the light absorption rate in the ridge region 5 (marked area 2 in Figure 3) is relatively higher than that in other areas (peripheral area 3 in Figure 3). This causes the ridge region 5 to appear relatively black, making the contrast of the tire side surface clearer and improving the visibility of the tire side surface.

[0040] Furthermore, in the configuration shown in Figure 7, the height H52 of the annular ridge 52 is in the range of 0.30 ≤ H52 / H51 < 1.00 relative to the depth H51 of the housing 51, and preferably in the range of 0.50 ≤ H52 / H51 ≤ 0.95. Therefore, the top of the annular ridge 52 is embedded within the housing 51. This configuration is preferable because it suppresses the deterioration of air resistance on the tire side surface caused by the annular ridge 52 protruding from the tire side surface. However, it is not limited to this configuration, and the annular ridge 52 may protrude from the tire side surface if the height H52 of the annular ridge 52 is in the range of 1.00 ≤ H52 / H51 relative to the depth H51 of the housing 51 (not shown). In this configuration, when applying wax to the tire side surface, the wax is more easily applied to the top of the annular ridge 52, improving the wax retention on the tire side surface.

[0041] The height H52 of the annular ridge 52 is defined as the distance from the top of the annular ridge 52 to the bottom surface of the housing 51, as shown in Figure 7. Specifically, it is measured as the distance from the top of the annular ridge 52 to the bottom of the valley between adjacent annular ridges 52, 52.

[0042] Furthermore, in Figure 7, the width W52A of the top of the annular ridge 52 is in the range of 0 ≤ W52A / W52B ≤ 0.90 relative to the width W52B of the base of the annular ridge 52, preferably in the range of 0.10 ≤ W52A / W52B ≤ 0.70. The lower limit suppresses deterioration of the processability of the annular ridge 52 caused by the top of the annular ridge 52 being too thin, and the upper limit improves the blackening effect of the annular ridge 52 on the tire side surface.

[0043] The widths W52A and W52B of the annular ridge 52 are measured as the width in a cross-section perpendicular to the longitudinal direction of the annular ridge 52. The width W52B of the base of the annular ridge 52 is defined as the width of the bottom surface of the annular ridge 52 (in Figure 7, the contact surface between the base of the annular ridge 52 and the bottom surface of the housing 51), and is specifically measured as the distance of a virtual line connecting the valley bottoms between adjacent annular ridges 52, 52.

[0044] In the configuration shown in Figure 2, the ridge region 5 consists of a housing 51 and a plurality of annular ridges 52 arranged within the housing 51 (see Figures 5 and 7). However, the configuration is not limited to this; the housing 51 may be omitted, and the ridge region 5 may consist only of the plurality of annular ridges 52 (not shown). For example, the plurality of annular ridges 52 may protrude from the same plane as the surrounding region 3. Even with such a configuration, the visibility of the emblem portion 2 can be improved.

[0045] Furthermore, in the configuration shown in Figure 2, the peripheral region 3 is a smooth surface. This configuration is preferable because it improves the visibility of the mark portion 2, which consists of the housing 51 and a plurality of annular ridges 52. However, it is not limited to this, and the peripheral region 3 may also be an uneven surface with a surface treatment (not shown). The uneven surface with a surface treatment may be composed of a plurality of arranged uneven portions, for example, a plurality of ridges or grooves having a longitudinal shape, or a plurality of projections or depressions having a hemispherical or conical shape.

[0046] [Planar shape of the ridge] As shown in Figure 5, the ridge region 5 consists of a plurality of annular ridges 52. The annular ridges 52 have an annular structure when viewed in plan on the tire side surface. The plurality of annular ridges 52 are repeatedly arranged in a predetermined arrangement pattern in the planar direction of the tire side portion.

[0047] An annular structure is defined as a structure formed by connecting the ends of a linear or longitudinal shape in a plan view of the tire side surface, and is not limited to a continuous annular shape around the entire circumference, but also includes a substantially annular shape having minute gaps of less than 0.50 mm, preferably less than 0.40 mm.

[0048] Furthermore, it is preferable that the annular ridge 52 has a circular, elliptical, or rounded polygonal shape. In other words, it is preferable that the annular ridge 52 has a smooth annular structure without corners.

[0049] When the annular ridge 52 is elliptical, the ratio of the length of the major axis to the length of the minor axis is 1.00 or more and 3.00 or less, preferably 1.00 or more and 1.41 or less.

[0050] A rounded regular polygon is defined as a polygon in which the vertices of a convex polygon are rounded into an R shape. Furthermore, the ratio of the maximum to minimum side length is between 1.00 and 5.00, preferably between 1.00 and 4.00. Also, the ratio of the maximum to minimum interior angle is between 1.00 and 5.00, preferably between 1.00 and 4.00. The R shape is formed by rounding a range of 40% to 90% of the side length, preferably between 50% and 85%, from each vertex of the base polygon.

[0051] Furthermore, rounded regular polygons include approximately rounded polygons formed by approximating their straight sections with circular arcs. Specifically, approximately rounded polygons are formed by replacing the straight sections of a rounded regular polygon with circular arcs that are convex radially outward of the annular ridge 52, and smoothly connecting these circular arcs with R-shaped circular arcs located at the vertices of the convex polygon. Therefore, the entire approximately rounded polygon is convex radially outward of the annular ridge 52 and is constructed by connecting multiple circular arcs having mutually different radii.

[0052] Furthermore, the ratio of the maximum value Rm_max to the minimum value Rm_min of the outer diameter Rm of the smallest inclusion circle of the annular ridge 52 (not shown in the figure) is in the range of 1.00 ≤ Rm_max / Rm_min ≤ 1.20, and preferably in the range of 1.00 ≤ Rm_max / Rm_min ≤ 1.05. Therefore, the annular ridge 52 has a substantially uniform size. Also, the outer diameter Rm of the smallest inclusion circle of the annular ridge 52 is in the range of 0.80 [mm] ≤ Rm ≤ 20.0 [mm], preferably in the range of 1.00 [mm] ≤ Rm ≤ 10.00 [mm], and more preferably in the range of 1.20 [mm] ≤ Rm ≤ 3.00 [mm].

[0053] Furthermore, as shown in Figure 6, each of the multiple annular ridges 52 includes multiple ridge units U, each consisting of one first annular ridge 52P and multiple second annular ridges 52Q intersecting the first annular ridge 52P. That is, each of the multiple second annular ridges 52Q intersects with one first annular ridge 52P.

[0054] Furthermore, the center points (indicated by the symbol omitted in the figure) of multiple second annular ridges 52Q are located outside the first annular ridge 52P (see Figure 6) or on top of the first annular ridge 52P.

[0055] Furthermore, preferably three or more, more preferably three, four, or six second annular ridges 52Q intersect one first annular ridge 52P. In this case, the three or more second annular ridges 52Q are arranged point-symmetrically from the center point of the first annular ridge 52P, that is, in mutually different directions. Specifically, the three or more second annular ridges 52Q are arranged in the circumferential direction of the first annular ridge 52P at a predetermined arrangement interval θ [deg] (see Figure 6), and the ratio θ_max / θ_min of the arrangement interval θ of the three or more second annular ridges 52Q between the maximum value θ_max and the minimum value θ_min is in the range of 1.00 ≤ θ_max / θ_min ≤ 1.50, preferably in the range of 1.00 ≤ θ_max / θ_min ≤ 1.30. As a result, the second annular ridges 52Q are dispersed, improving the visual angle uniformity of the ridge region 5.

[0056] The center point of the annular ridge 52 is defined as the center point of the smallest inclusion circle of the annular ridge 52.

[0057] The spacing θ [deg] of the second annular ridges 52Q is defined as the angle formed by a virtual line passing through the center points of adjacent second annular ridges 52Q and the center point of the first annular ridge 52P, as shown in Figure 6.

[0058] Furthermore, multiple ridge units U are arranged continuously without spacing from each other. As a result, multiple annular ridges 52 are arranged continuously and fill the ridge region 5. In addition, since the first and second annular ridges 52P and 52Q constituting the multiple ridge units U have the same shape and size, the continuous arrangement of multiple ridge units U can be efficiently realized.

[0059] For example, in the configuration shown in Figure 5, adjacent ridge units U, U (not shown in the figure) are arranged to share one or two of the multiple second annular ridges 52Q (see Figure 6). Specifically, as shown in Figure 6, a first ridge unit U is defined, consisting of one first annular ridge 52P and multiple second annular ridges 52Q intersecting this first annular ridge 52P. Similarly, a second ridge unit U (not shown) is defined, consisting of one first annular ridge 52P and multiple second annular ridges 52Q. Then, as shown in Figure 5, the first and second ridge units U, U (not shown in the figure) are arranged adjacent to each other so as to share one or two of the multiple second annular ridges 52Q. As multiple ridge units U are defined sequentially and arranged in the same manner, multiple annular ridges 52 are connected in the planar direction and fill the entire ridge region 5. This forms a ridge region 5 consisting of multiple intersecting annular ridges 52, as shown in Figure 5. Furthermore, by arranging adjacent ridge units U, U with the first annular ridges 52P, 52P interconnected, multiple annular ridges 52 can be arranged in a close-packed structure.

[0060] Furthermore, the above is not limited to the arrangement where adjacent ridge units U, U intersect or connect parts of multiple second annular ridges (not shown). Also, adjacent ridge units U, U may be arranged with the first annular ridges 52P, 52P spaced apart from each other (not shown).

[0061] In the above configuration, (1) since the tire 1 has a ridge region 5 on the tire side surface, the light absorption rate in the ridge region 5 (marked area 2 in Figure 3) is relatively higher than the light absorption rate in other areas (peripheral area 3 in Figure 3). As a result, the ridge region 5 is relatively blackened, and the contrast of the tire side surface becomes clearer. Also, (2) since the ridge region 5 consists of a plurality of annular ridges 52 having an annular structure in a plan view of the tire side surface, the diffuse reflection of light between the ridges is promoted, improving the uniformity of the viewing angle of the ridge region 5, that is, the uniformity of the blackening effect of the ridge region 5 when the tire side surface is viewed from different directions. Also, (3) since the plurality of annular ridges 52 include a plurality of ridge units U consisting of one first annular ridge 52P and a plurality of second annular ridges 52Q intersecting the first annular ridge 52P, and the plurality of ridge units U are arranged continuously, the arrangement density of the annular ridges 52 is increased, improving the blackening effect of the ridge region 5, and also facilitating the laser processing of the vulcanization molding die for forming the ridge region 5.

[0062] For example, in the configuration shown in Figure 5, a single annular ridge 52 has a circular shape when viewed from above on the tire side surface. Also, as shown in Figure 6, one ridge unit U consists of one first annular ridge 52P and four second annular ridges 52Q. Each of the four second annular ridges 52Q intersects with one first annular ridge 52P. Furthermore, the four second annular ridges 52Q are arranged point-symmetrically with respect to the first annular ridge 52P and intersect with it. Also, the four second annular ridges 52Q are connected in a ring and arranged in a grid pattern. Then, as shown in Figure 5, multiple ridge units U (notation omitted in the figure; see Figure 6) are arranged in the planar direction on the tire side surface. At this time, multiple ridge units U are repeatedly arranged vertically and horizontally in a manner in which adjacent ridge units U share one or two second annular ridges 52Q with each other. As a result, multiple annular ridges 52 are arranged vertically and horizontally, intersecting in a chain-like manner, and filling the ridge region 5. The number of second annular ridges 52Q shared by adjacent ridge units U, U differs depending on which of the multiple annular ridges 52 in Figure 5 is defined as the first annular ridge 52P.

[0063] Furthermore, in Figure 5, as shown in Figure 6, multiple cells C1 and C2 are defined, which are demarcated by multiple annular ridges 52. Specifically, in one ridge unit U, multiple cells C1 and C2 are formed inside the first annular ridge 52P by the intersection of one first annular ridge 52P and multiple second annular ridges 52Q.

[0064] At this time, the ratio of the maximum value Sc_max to the minimum value Sc_min of the area S (not shown) of these cells C1 and C2 is in the range of 1.00 ≤ Sc_max / Sc_min ≤ 1.60, and preferably in the range of 1.00 ≤ Sc_max / Sc_min ≤ 1.20. As a result, the areas of the multiple cells C1 and C2 are made uniform, and the ridge region 5 is uniformly blackened.

[0065] The area Sc of cells C1 and C2 is measured as the area of ​​the closed region surrounded by the wall surface of the annular ridge 52Q in a plan view of the tire sidewall.

[0066] Furthermore, as shown in Figure 6, in Figure 5, the maximum value Dc_max of the distance Dc(Dc1, Dc2) between the opposing wall surfaces of the multiple cells C1, C2 partitioned by the multiple annular ridges 52 is in the range of 0.10[mm]≦Dc_max≦1.10[mm], preferably in the range of 0.20[mm]≦Dc_max≦0.80[mm]. The lower limit ensures the light absorption effect due to the gap between the opposing wall surfaces of the annular ridges 52, and the upper limit ensures the light absorption rate at the distance between the opposing wall surfaces, thereby ensuring the blackening effect of the ridge region 5.

[0067] The distance Dc (Dc1, Dc2) between opposing wall surfaces is measured as the distance between the centerlines of the annular ridge 52 in a plan view of the multiple cells C1 and C2 demarcated by the annular ridge 52. Furthermore, if cells C1 and C2 have a longitudinal shape, the distance between opposing wall surfaces is measured as the distance between the centerlines of the annular ridge 52 in a direction perpendicular to their longitudinal direction. However, in configurations where adjacent ridges have a partial connection, the separation distance Dc is measured excluding this connection.

[0068] Furthermore, in Figure 6, the distance Dr2 between the opposing walls of adjacent second annular ridges 52Q, 52Q is in the range of 0[mm]≦Dr2≦1.10[mm], preferably in the range of 0[mm]≦Dr2≦0.80[mm]. The above upper limit ensures the light absorption rate at the distance between the opposing walls of the annular ridge 52, thereby ensuring the blackening effect of the ridge region 5. In the configuration of Figure 6, since adjacent second annular ridges 52Q, 52Q are connected to each other in an annular shape, the distance Dr2 between the opposing walls is 0[mm].

[0069] The distance Dr2 between opposing walls is measured as the distance between the centerlines of adjacent second annular ridges 52Q, 52Q in a plan view. Furthermore, if adjacent second annular ridges 52Q, 52Q intersect to demarcate a cell, the distance between opposing walls is measured as the distance between the centerlines of adjacent second annular ridges 52Q, 52Q in a direction perpendicular to the longitudinal direction of the cell. However, in configurations where adjacent ridges have a partial connection, the separation distance Dr2 is measured excluding this connection.

[0070] [Tire manufacturing method] This tire 1 is manufactured using a tire molding die capable of transferring the ridge region 5 described above to the tire side surface.

[0071] Specifically, tire 1 is manufactured by, for example, the following manufacturing process. First, tire components such as bead wire constituting the bead core, carcass ply constituting the carcass layer, belt ply constituting the belt layer, tread rubber, sidewall rubber, and rim cushion rubber are put into a molding machine to form a green tire (not shown). Next, the green tire is filled into a tire vulcanization mold (not shown) including a tire molding die. Next, the green tire is expanded radially outward by a pressurizing device and comes into contact with the tire molding die. Next, the tire vulcanization mold is heated, causing the rubber molecules and sulfur molecules of the green tire to bond and vulcanization to proceed. At this time, the shape of the molding surface of the tire molding die is transferred to the outer surface of the green tire, and the tire side surface is formed. Finally, the vulcanized tire is pulled out of the tire vulcanization mold.

[0072] Furthermore, the ridge region 5 on the tire side surface described above is formed by irregularities formed on the molding surface of the tire molding die. These irregularities on the molding surface of the tire molding die are formed, for example, by laser processing.

[0073] Figure 8 is an explanatory diagram showing the processing method for the ridge region 5 described in Figure 5.

[0074] In the configuration shown in Figure 5, all the annular ridges 52 are arranged in a chain-like manner, intersecting each other and filling the ridge region 5. This configuration is preferable because, during the processing of the molding surface of the tire molding die, the uneven areas for forming the ridge region 5 can be formed in a so-called single stroke using laser processing. Here, "single stroke" does not mean a strictly single stroke, but rather that the uneven areas can be processed without turning the laser ON / OFF in the central part of the ridge region 5. For this reason, the laser may pass through the same path.

[0075] Specifically, when forming the uneven surface for shaping the ridge region 5 shown in Figure 5, laser processing is performed on the molding surface of the tire molding die according to the procedure shown in Figure 8. That is, the laser is moved back and forth so that the ridge portion (L1) shown by the solid line in Figure 8 is the forward pass and the ridge portion (L2) shown by the dashed line is the return pass, and laser processing is performed. As a result, one annular ridge 52 is formed in two parts by the forward and return passes. At this time, all the annular ridges 52 are arranged intersecting in a chain-like manner, so the uneven surface can be processed without turning the laser ON / OFF in the center of the ridge region 5.

[0076] [Differentiation] Figures 9 to 12 are explanatory diagrams showing modified examples of the ridge region 5 described in Figure 5. These figures, like Figure 6, show enlarged views of individual ridge units U. In these figures, components identical to those described in Figures 5 and 6 are denoted by the same reference numerals, and their descriptions are omitted.

[0077] In the configuration shown in Figure 5, the annular ridge 52 has a perfect circle shape, as shown in Figure 6. This configuration is preferable because it offers a high degree of freedom in the arrangement of the annular ridge 52.

[0078] However, the configuration is not limited to this; as described above, the annular ridge 52 may have an elliptical shape, a rounded polygon, or a shape formed by connecting multiple types of arcs with mutually different curvatures. For example, in the modified example shown in Figure 9, the annular ridge 52 constituting the ridge unit U has a rounded square shape, thereby equalizing the areas of the multiple cells C1 and C2 partitioned by the multiple annular ridges 52. In particular, the areas of cells C1 and C2 having different shapes are made uniform. This configuration is preferable in that the ridge region 5 is uniformly blackened.

[0079] Furthermore, in the configuration shown in Figure 5, as shown in Figure 6, multiple second annular ridges 52Q intersecting a single first annular ridge 52P are arranged in a ring-like configuration connected to one another. Therefore, the distance Dr2 between the opposing wall surfaces of adjacent second annular ridges 52Q, 52Q is 0 [mm]. This configuration is preferable because, when processing the uneven portion for forming the ridge region 5 on the molding surface of the tire molding die, it can be processed efficiently by laser processing, for example, the uneven portion can be laser processed in a so-called single-stroke manner (see Figure 8).

[0080] However, the configuration is not limited to this; as shown in Figures 10 and 11, multiple second annular ridges 52Q intersecting a single first annular ridge 52P may be spaced apart from each other. In the configurations shown in Figures 10 and 11, all four second annular ridges 52Q are spaced apart from each other. Furthermore, the distance Dr2 between the opposing walls of adjacent second annular ridges 52Q, 52Q is optimized to the range described above. Even with this configuration, the blackening effect of the ridge region 5 is ensured.

[0081] Furthermore, in the configuration shown in Figure 5, as shown in Figure 6, one ridge unit U is formed by four second annular ridges 52Q intersecting one first annular ridge 52P. This configuration is preferable because, since the four second annular ridges 52Q can be arranged in a grid while being connected to each other in an annular shape, the area of ​​cells C1 and C2 partitioned by the annular ridges 52 can be efficiently made uniform using annular ridges 52 having rounded squares, for example, as shown in the modified example in Figure 9.

[0082] However, this is not the only way; as shown in Figures 12 and 13, a ridge unit U may be formed by three second annular ridges 52Q (see Figure 13) intersecting a single first annular ridge 52P. Specifically, in the configuration of Figure 12, as shown in Figure 13, the three second annular ridges 52Q are interconnected in a truss-like manner and arranged to surround a single first annular ridge 52P. Then, as shown in Figure 12, adjacent ridge units U, U (notation omitted in the figure) share a single second annular ridge 52Q and are also interconnected by the first annular ridge 52P. Multiple ridge units U are then repeatedly arranged to fill the ridge region 5. As a result, multiple annular ridges 52 are arranged in a chain-like intersecting, close-packed structure.

[0083] Furthermore, as shown in Figures 14 and 15, a ridge unit U may be formed by six second annular ridges 52Q (see Figure 15) intersecting a single first annular ridge 52P. Specifically, in the configuration of Figure 14, as shown in Figure 15, the six second annular ridges 52Q are arranged in a ring, sharing the center of a single first annular ridge 52P, and intersecting the first annular ridge 52P. Also, adjacent second annular ridges 52Q intersect with each other. Then, as shown in Figure 15, adjacent ridge units U, U (notation omitted in the figure) are arranged sharing two second annular ridges 52Q with each other and connecting the first annular ridges 52P with each other. Then, multiple ridge units U are repeatedly arranged and filled into the ridge region 5. As a result, multiple annular ridges 52 are arranged in a close-packed structure while intersecting in a chain-like manner. Also, in the configuration of Figure 14, adjacent ridge units U, U intersect their two second annular ridges 52Q with the other first annular ridge 52P. Therefore, as shown in Figure 15, the first annular ridge 52P is divided into a total of 18 cells C1 to C3 by its own second annular ridge 52Q and the second annular ridge of the adjacent ridge unit U (dashed line in the figure: symbol omitted). Furthermore, these cells C1 to C3 have approximately the same area.

[0084] Furthermore, as shown in Figures 16 and 17, a single ridge unit U may be formed when five (Figure 16) or eight (Figure 17) second annular ridges 52Q intersect with a single first annular ridge 52P.

[0085] Furthermore, in the configuration shown in Figure 2, as described above, the emblem portion 2 consists of a ridge region 5, and the surrounding region 3 is made up of a smooth surface. This configuration is preferable because the emblem portion 2 is blackened, improving its visibility.

[0086] In contrast, in the configuration shown in Figure 18, the mark portion 2 consists of a smooth surface, and the surrounding area 3 is composed of a ridge area 5. Specifically, the ridge area 5 is composed of a housing 51 (not shown; see Figure 7) that surrounds the contour line of the mark portion 2 within an area demarcated by a pair of thin ribs 41 and 42, and a plurality of annular ridges 52 arranged on this housing 51. In this configuration, the surrounding area 3 is blackened, and the mark portion 2 is presented with an appearance that inverts the contrast.

[0087] [effect] As described above, [1] this tire 1 is provided with a ridge region 5 on the tire side surface (see Figures 1 to 4). The ridge region 5 consists of a plurality of annular ridges 52 having an annular structure in a plan view of the tire side surface (see Figure 5). The plurality of annular ridges 52 also include a plurality of ridge units U (see Figure 6) which consist of one first annular ridge 52P and a plurality of second annular ridges 52Q intersecting the first annular ridge 52P. The plurality of ridge units U are arranged in a continuous manner such that adjacent ridge units U and U share one or two of the plurality of second annular ridges 52Q with each other (see Figure 5), or intersect or connect with each other (not shown).

[0088] In the above configuration, (1) since the tire 1 has a ridge region 5 on its side surface, the light absorption rate in the ridge region 5 (marked area 2 in Figure 3) is relatively higher than the light absorption rate in other areas (peripheral area 3 in Figure 3). This has the advantage that the ridge region 5 is relatively blackened, making the contrast of the tire side surface clearer. Also, (2) since the ridge region 5 consists of multiple annular ridges 52 that have an annular structure when viewed from above on the tire side surface, the diffuse reflection of light between the ridges is promoted, which has the advantage that the uniformity of the viewing angle of the ridge region 5, that is, the uniformity of the blackening effect of the ridge region 5 when the tire side surface is viewed from different directions, is improved. Furthermore, (3) each of the multiple annular ridges 52 includes multiple ridge units U, each consisting of one first annular ridge 52P and multiple second annular ridges 52Q intersecting the first annular ridge 52P, and the multiple ridge units U are arranged in a continuous pattern. This increases the arrangement density of the annular ridges 52, improving the blackening effect of the ridge region 5, and also has the advantage of facilitating laser processing of the vulcanization mold for forming the ridge region 5.

[0089] Furthermore, [2] in this tire 1 described in [1] above, three, four, or six second annular ridges 52Q intersect with one first annular ridge 52P (see Figures 6, 13, and 15). This has the advantage of efficiently realizing a continuous arrangement of multiple ridge units U.

[0090] Furthermore, [3] in the tire 1 described in [1] or [2] above, the annular ridge 52 has the shape of a circle, an ellipse, or a rounded regular polygon. Compared to a configuration in which the annular ridge 52 has an angular shape (not shown), this configuration has the advantage of promoting the diffuse reflection of light between the ridges, thereby improving the uniformity of the viewing angle of the ridge region 5.

[0091] Furthermore, [4] in the tire 1 described in any one of [1] to [3] above, the ratio of the maximum value Sc_max to the minimum value Sc_min of the area S of the multiple cells C1 and C2 (see Figure 6) demarcated by the multiple annular ridges 52 is in the range of 1.00 ≤ Sc_max / Sc_min ≤ 1.60. As a result, the areas of the multiple cells C1 and C2 are made uniform, and the ridge region 5 is uniformly blackened.

[0092] Furthermore, [5] in the tire 1 described in any one of [1] to [4] above, the maximum value Dc_max of the distance Dc (Dc1, Dc2; see Figure 6) between the opposing wall surfaces of multiple cells C1, C2 demarcated by multiple annular ridges 52 is in the range of 0.10 [mm] ≤ Dc_max ≤ 1.10 [mm]. This has the advantage that the widths of the multiple cells C1, C2 are made uniform, and the ridge region 5 is uniformly blackened.

[0093] Furthermore, [6] in the tire 1 described in any one of [1] to [5] above, a plurality of second annular ridges 52Q intersecting a single first annular ridge 52P are arranged to intersect (see, for example, Figure 15) or connect (see, for example, Figures 6 and 13) with each other in an annular shape. With this configuration, when processing the uneven parts for forming the ridge region 5 on the molding surface of the tire molding die, there is an advantage that the processing can be done efficiently by laser processing, for example, the uneven parts can be laser processed in a so-called single stroke.

[0094] Furthermore, [7] in the tire 1 described in any one of [1] to [6] above, adjacent ridge units U, U (see Figures 6, 13, and 15) share one or two of the multiple second annular ridges 52Q with each other, and are arranged with the first annular ridges 52P connected to each other (see Figures 5, 12, and 14). This has the advantage of allowing multiple annular ridges 52 to be arranged in a close-packed structure.

[0095] Furthermore, [8] in the tire 1 described in any one of [1] to [7] above, a plurality of second annular ridges 52Q are arranged in the circumferential direction of the first annular ridge 52P at a predetermined arrangement interval θ [deg], and the ratio θ_max / θ_min of the arrangement interval θ of the plurality of second annular ridges 52Q from the maximum value θ_max to the minimum value θ_min is in the range of 1.00 ≤ θ_max / θ_min ≤ 1.50. This has the advantage that the second annular ridges 52Q are arranged in a dispersed manner, improving the visual angle uniformity of the ridge region 5.

[0096] Furthermore, [9] in the tire 1 described in any one of [1] to [8] above, the ratio of the maximum value Rm_max to the minimum value Rm_min of the outer diameter Rm (see Figure 6) of the minimum inclusion circle of the multiple annular ridges 52Q is in the range of 1.00 ≤ Rm_max / Rm_min ≤ 1.20. This has the advantage that the ridge region 5 is uniformly blackened.

[0097] Furthermore,

[10] in the tire 1 described in any one of [1] to [9] above, the outer diameter Rm (see Figure 6) of the minimum inclusion circle of the multiple annular ridges 52 is in the range of 0.80 [mm] ≤ Rm ≤ 20.0 [mm]. The above lower limit ensures the machinability of the annular ridges 52, and the above upper limit has the advantage of ensuring the arrangement density of annular ridges 52 in the ridge region 5.

[0098] Furthermore,

[11] the tire 1 described in any one of [1] to

[10] above is provided with a marking portion 2 and a surrounding area 3 surrounding the marking portion 2 on the tire side surface (see Figure 2). In addition, the marking portion 2 includes a ridge area 5, and the surrounding area 3 consists of a smooth surface. This has the advantage that the marking portion 2 is blackened, improving its visibility.

[0099] Furthermore,

[12] the tire 1 described in any one of [1] to

[10] above is provided with a marking portion 2 and a peripheral region 3 surrounding the marking portion 2 on the tire side surface (see Figure 18). The marking portion 2 is made of a smooth surface, and the peripheral region 3 includes a ridge region 5. In this configuration, the peripheral region 3 is blackened, and the marking portion 2 is presented with an appearance that inverts the contrast.

[0100] [Applicable to] In this embodiment, as described above, a pneumatic tire was explained as an example of a tire. However, the configuration described in this embodiment is not limited to this and can be arbitrarily applied to other tires within the scope of what is obvious to those skilled in the art. Examples of other tires include airless tires and solid tires. [Examples]

[0101] Figure 19 is a diagram showing the results of a performance test of a tire according to an embodiment of this invention.

[0102] In this performance test, several types of test tires were evaluated for (1) blackening performance of the ridge area and (2) uniformity of the ridge area at a visual angle. A test tire with tire size 255 / 35R19 (96Y) was mounted on a rim with a rim size of 19×9J, and this test tire was subjected to the internal pressure specified by JATMA.

[0103] (1) In the evaluation of the visibility performance of the mark, the inspector visually inspects the tire sidewall of the test tire from a distance of 5 [m] and performs a sensory evaluation of the visibility of the ridge area, in particular the degree of blackening of the ridge area (contrast with the surroundings). This evaluation is performed using an index evaluation with the comparative example as the baseline (100), and a higher value is preferable.

[0104] (2) In the evaluation of the performance of uniformity of the viewing angle in the ridge area, the inspector visually inspects the tire sidewall of the test tire from a distance of 5 m while rotating it 120 degrees at a time, and performs a sensory evaluation of the visibility of the ridge area, in particular whether the degree of blackening of the ridge area is uniform. This evaluation is performed using an index evaluation with the comparative example as the baseline (100), and a higher value is preferable.

[0105] The test tire of the embodiment has the configuration shown in Figures 1 to 4 and Figure 7, and the marking portion 2 is composed of a ridge region 5 made up of a plurality of annular ridges 52 arranged therein. Furthermore, all annular ridges 52 have the same shape and equal outer diameter Rm. In addition, a plurality of ridge units U are arranged in a continuous manner such that adjacent ridge units U, U share one or two second annular ridges 52Q with each other. Furthermore, the depth H51 of the housing 51 (see Figure 7) is H51 = 0.80 [mm], and the height H52 of the annular ridge 52, the width W52A at the top and the width W52B at the base are H52 = 0.50 [mm], W52A = 0.10 [mm], and W52B = 0.37 [mm].

[0106] In the comparative example test tire, the ridge region is composed of multiple ridges arranged in parallel, with a linear shape in a plan view (not shown). The pitch length between adjacent ridges is 1.10 mm.

[0107] As the test results show, the test tire in the example demonstrates improved blackening performance and visual angle uniformity performance in the ridge region. [Explanation of Symbols]

[0108] 1 Tire; 11 Bead core; 12 Bead filler; 13 Carcass layer; 14 Belt layer; 141, 142 Cross belt; 143 Belt cover; 15 Tread rubber; 16 Sidewall rubber; 17 Rim cushion rubber; 20 Rim; 2 Emblem area; 3 Peripheral area; 5 Ridge area; 41, 42 Thin rib; 51 Housing; 52, 52P, 52Q Annular ridge; C1, C2 Cell; U Ridge unit

Claims

1. A tire having a ridge region on the tire side surface, The ridge region consists of a plurality of annular ridges having an annular structure in a plan view of the tire side surface. The plurality of annular ridges include a plurality of ridge units, each consisting of one first annular ridge and a plurality of second annular ridges intersecting the first annular ridge, The tire is characterized in that the plurality of ridge units are arranged in a continuous manner such that adjacent ridge units share one or two of the plurality of second annular ridges with each other, or intersect or connect with each other.

2. The tire according to claim 1, wherein three, four, or six of the second annular ridges intersect with one of the first annular ridges.

3. The tire according to claim 1, wherein the annular ridge is circular, elliptical, or a rounded regular polygon.

4. The tire according to claim 1, wherein the ratio of the maximum value Sc_max to the minimum value Sc_min of the area S of the plurality of cells partitioned by the plurality of annular ridges is in the range of 1.00 ≤ Sc_max / Sc_min ≤ 1.

60.

5. The tire according to claim 1, wherein the maximum value Dc_max of the distance Dc between opposing wall surfaces of a plurality of cells partitioned by the plurality of annular ridges is in the range of 0.10 [mm] ≤ Dc_max ≤ 1.10 [mm].

6. The tire according to claim 1, wherein the plurality of second annular ridges intersecting the one first annular ridge are arranged to intersect or connect with each other in an annular manner.

7. The tire according to claim 1, wherein the adjacent ridge units share one or two of the plurality of second annular ridges with each other and are arranged with the first annular ridges connected to each other.

8. The tire according to claim 1, wherein the plurality of second annular ridges are arranged at a predetermined spacing θ [deg] in the circumferential direction of the first annular ridge, and the ratio θ_max / θ_min of the maximum value θ_max to the minimum value θ_min of the spacing θ of the plurality of second annular ridges is in the range of 1.00 ≤ θ_max / θ_min ≤ 1.

50.

9. The tire according to claim 1, wherein the ratio of the maximum value Rm_max to the minimum value Rm_min of the outer diameter Rm of the minimum inclusion circle of the plurality of annular ridges is in the range of 1.00 ≤ Rm_max / Rm_min ≤ 1.

20.

10. The tire according to claim 1, wherein the outer diameter Rm of the smallest inclusion circle of the plurality of annular ridges is in the range of 0.80 [mm] ≤ Rm ≤ 20.0 [mm].

11. The tire side surface is provided with a mark portion and a surrounding area surrounding the mark portion. The mark portion includes the ridge region, and The tire according to claim 1, wherein the peripheral region is a smooth surface.

12. The tire side surface is provided with a mark portion and a surrounding area surrounding the mark portion. The mark portion is made of a smooth surface, and The tire according to claim 1, wherein the peripheral region includes the ridge region.

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