Tire

Abstract

To provide a tire in which visibility of a pattern part can be improved.SOLUTION: The tire comprises a pattern part 4 in which a plurality of ridges 7 are arranged on tire surfaces 3A and 5A. The pattern part 4 has a plurality of element patterns 8 formed of the ridges 7. The plurality of element patterns 8 are formed of the continuous ridges 7 and the adjacent element patterns 8 are connected to each other through the ridges 7. In the element patterns 8, the ridges 7 forming the element patterns 8 respectively have first parts 7A extending from the outside of the element patterns 8 toward insides of the element patterns 8 in one direction in an extending direction of the ridges 7 and second parts 7B extending from the insides of the element patterns 8 toward the outsides of the element patterns 8.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present invention relates to a tire, and more particularly to a tire that can improve the visibility of a pattern portion. [Background technology]

[0002] Some conventional tires have a pattern made up of multiple protrusions formed on the surface of the tire side to improve the visibility of the pattern. For example, a tire described in Patent Document 1 has a pattern on the tire surface in which protrusions whose ridge lines have curved portions in a plan view are arranged in a nested manner with a center point, the protrusions having a height of 0.2 mm to 0.5 mm, and adjacent protrusions are arranged at a constant pitch of 0.15 mm to 0.35 mm. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-132296 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when protrusions having curved portions are arranged in a nested manner with a central point, the pattern portion tends to have a monotonous design due to the nested protrusions, and the contrast of the pattern portion is reduced, so it is desired to further improve visibility.

[0005] The present invention has been made in view of the above, and has an object to provide a tire that can improve the visibility of a pattern portion. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, a tire according to one embodiment of the present invention has a pattern portion in which a plurality of ridges are arranged on the tire surface, the pattern portion having a plurality of element patterns formed by the ridges, the plurality of element patterns being formed by continuous ridges and adjacent element patterns being connected by the ridges, and the ridges forming the element patterns have a first portion extending from the outside of the element pattern to the inside of the element pattern in one direction in the extension direction of the ridges, and a second portion extending from the inside of the element pattern to the outside of the element pattern. [Effects of the Invention]

[0007] The tire according to the present invention has an effect of improving the visibility of the pattern portion. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a pneumatic tire according to an embodiment taken along the tire meridian direction. [Figure 2] FIG. 2 is a plan view showing a tire side portion of the tire shown in FIG. [Figure 3] FIG. 3 is an enlarged view of a part of the marking portion on the tire side shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view of a portion of the marking portion shown in FIG. [Figure 5] FIG. 5 is an enlarged view of a part of the marking portion on the tire side portion shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view of a portion of the marking portion shown in FIG. [Figure 7] FIG. 7 is an enlarged view of a part of the marking portion on the tire side portion shown in FIG. [Figure 8] FIG. 8 is a cross-sectional view of a portion of the marking portion shown in FIG. [Figure 9] FIG. 9 is an enlarged view of the pattern portion. [Figure 10] FIG. 10 is a partially enlarged cross-sectional view of the pattern portion. [Figure 11] FIG. 11 is a detailed view of the element pattern shown in FIG. [Figure 12] FIG. 12 is an explanatory diagram of a basic shape body that is the basis of an element pattern. [Figure 13] FIG. 13 is an explanatory diagram showing a state in which two divided bodies of a basic shape body are shifted. [Figure 14] FIG. 14 is an explanatory diagram showing a state in which a plurality of element patterns are formed by continuous ridges. [Figure 15] FIG. 15 is an explanatory diagram showing a modified example of the pneumatic tire according to the embodiment, in which the ridges of the element pattern are formed in four spirals. [Figure 16] FIG. 16 is an explanatory diagram showing a modified example of the pneumatic tire according to the embodiment, in which the ridges of the element pattern are formed in double spirals. [Figure 17] FIG. 17 is an explanatory diagram showing a modified example of the pneumatic tire according to the embodiment, in which the element patterns are formed in a substantially rectangular spiral shape. [Figure 18] FIG. 18 is an explanatory diagram showing a modified example of the pneumatic tire according to the embodiment, in which the element patterns are formed in a substantially rectangular spiral shape. [Figure 19] FIG. 19 is an explanatory diagram showing a modified example of the pneumatic tire according to the embodiment, in which the element patterns are formed in a generally diamond-shaped spiral shape. [Figure 20] FIG. 20 is an explanatory diagram showing a modified example of the pneumatic tire according to the embodiment, in which the element patterns are formed in a substantially hexagonal spiral shape. [Figure 21] FIG. 21 is an explanatory diagram showing a modified example of the pneumatic tire according to the embodiment, in which the element patterns are formed in a substantially triangular spiral shape. [Figure 22] FIG. 22 is a table showing the results of a performance evaluation test of a pneumatic tire. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments. Furthermore, the components of these embodiments include those that can be substituted and are obvious substitutes while maintaining the identity of the invention. Furthermore, the multiple modifications described in these embodiments can be arbitrarily combined within the scope obvious to those skilled in the art.

[0010] [Embodiment] Fig. 1 is a cross-sectional view in the tire meridian direction of a pneumatic tire according to an embodiment. Fig. 1 shows a cross-sectional view of one side region in the tire radial direction of a pneumatic tire 1 mounted on a rim 20. In the embodiment, a pneumatic tire, that is, a pneumatic radial tire for passenger cars, will be described as an example of a tire.

[0011] The tire meridian cross section shown in Figure 1 is defined as a cross section of the tire cut by a plane including the tire rotational axis (not shown). The tire equatorial plane CL is defined as a plane that passes through the midpoint of the tire section width defined by JATMA and is perpendicular to the tire rotational axis. The tire width direction is defined as the direction parallel to the tire rotational axis, and the inner side in the tire width direction refers to the side toward the tire equatorial plane CL in the tire width direction, and the outer side in the tire width direction refers to the side away from the tire equatorial plane CL in the tire width direction. The tire radial direction is defined as the direction perpendicular to the tire rotational axis, and the inner side in the tire radial direction refers to the side toward the tire rotational axis in the tire radial direction, and the outer side in the tire radial direction refers to the side away from the tire rotational axis in the tire radial direction. The tire circumferential direction refers to the direction around the tire rotational axis as the central axis.

[0012] The pneumatic tire 1 has an annular structure centered on the tire rotation axis, and as shown in FIG. 1, includes a pair of bead cores 11, a pair of bead fillers 12, a carcass layer 13, a belt layer 14, a tread rubber 15, a pair of sidewall rubbers 16, and a pair of rim cushion rubbers 17.

[0013] The pair of bead cores 11 are formed by winding one or more bead wires made of steel in an annular and multiply fashion, and are embedded in the bead portions to form the cores of the bead portions on both sides in the tire width direction.

[0014] The pair of bead fillers 12 are respectively arranged on the outer periphery of the pair of bead cores 11 in the tire radial direction to reinforce the bead portion.

[0015] 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. The carcass layer 13 is toroidally laid between the bead cores 11 on both sides in the tire width direction to form the tire framework. Both ends of the carcass layer 13 are wrapped around and secured to the outside in the tire width direction so as to enclose the bead cores 11 and the bead fillers 12. The carcass ply of the carcass layer 13 is formed by coating multiple carcass cords made of steel or organic fiber material (e.g., aramid, nylon, polyester, rayon, etc.) with coating rubber and rolling them. The carcass cords of the carcass layer 13 have a cord angle (defined as the inclination angle of the carcass cord in the longitudinal direction with respect to the tire circumferential direction) of 80 degrees or more and 100 degrees or less in absolute value.

[0016] The belt layer 14 is formed by laminating, for example, a plurality of belt plies 141 to 143, and is disposed by being wound around the outer periphery of the carcass layer 13. The belt plies 141 to 143 include, from the inner side in the tire radial direction, a pair of cross belts 141, 142 and a belt cover 143.

[0017] The pair of cross belts 141, 142 are formed by coating a plurality of belt cords made of steel or organic fiber material with coating rubber and rolling them. The cross belts 141, 142 have belt cords with an absolute cord angle (defined as the inclination angle of the belt cords in the longitudinal direction with respect to the tire circumferential direction) of 15 degrees or more and 55 degrees or less. The cross belts 141, 142 have belt cords with cord angles of opposite signs, and are layered with the longitudinal directions of the belt cords crossing each other (so-called cross-ply structure). The cross belts 141, 142 are layered and arranged on the outer side of the carcass layer 13 in the tire radial direction.

[0018] The belt cover 143 is formed by covering a belt cover cord made of steel or organic fiber material with coating rubber. In the belt cover 143, the belt cover cord has a cord angle (defined as the inclination angle of the belt cord in the longitudinal direction with respect to the tire circumferential direction) of 0 degrees or more and 10 degrees or less in absolute value. The belt cover 143 is, for example, a strip material formed by covering one or more belt cover cords with coating rubber, and is formed by spirally winding this strip material multiple times around the outer circumferential surfaces of the cross belts 141, 142 in the tire circumferential direction. The belt cover 143 is arranged to cover the entire area of ​​the cross belts 141, 142.

[0019] The tread rubber 15 is disposed on the outer periphery of the carcass layer 13 and the belt layer 14 in the tire radial direction to form the tread portion of the tire 1. The tread rubber 15 is made of a rubber material that has excellent ground contact characteristics and weather resistance, and is exposed over the entire outer periphery of the tire to form the tread surface.

[0020] The pair of sidewall rubbers 16 are disposed on the outer sides of the carcass layer 13 in the tire width direction, and form sidewall portions on both sides in the tire width direction.

[0021] The pair of rim cushion rubbers 17 extend from the inner side in the tire radial direction to the outer side in the tire width direction of each bead core 11 and each turned-up portion of the carcass layer 13, and form the rim fitting surface of the bead portion.

[0022] FIG. 2 is a plan view showing a tire side portion of the tire shown in FIG.

[0023] As shown in FIG. 2, the pneumatic tire 1 of the embodiment includes a marking portion 2 and a peripheral region 3 in a tire side portion 18.

[0024] The tire side portion 18 is a surface that continues uniformly from the ground contact edge T of the tread surface outward in the tire width direction and from the rim check line R outward in the tire radial direction, and is an annular surface that extends along the tire circumferential direction. The ground contact edges T refer to both outermost ends in the tire width direction in the region where the tread surface of the pneumatic tire 1 comes into contact with the road surface when the pneumatic tire 1 is mounted on a normal rim, inflated to the normal internal pressure, and subjected to 70% of the normal load, and continue in the tire circumferential direction. The rim check line R is a line used to check whether the tire is mounted properly on the rim, and is generally shown as a circular convex line that continues in the tire circumferential direction along the front side of the bead portion 10, radially outward of the rim flange 20a and near the rim flange 20a.

[0025] Here, the normal rim refers to the "applicable rim" defined by JATMA, the "design rim" defined by TRA, or the "measuring rim" defined by ETRTO. The normal internal pressure refers to the "maximum air pressure" defined by JATMA, the maximum value of the "tire load limits at various cold inflation pressures" defined by TRA, or the "inflation pressures" defined by ETRTO. The normal load refers to the "maximum load capacity" defined by JATMA, the maximum value of the "tire load limits at various cold inflation pressures" defined by TRA, or the "load capacity" defined by ETRTO. In the case of the pneumatic tire 1 of the embodiment, the normal load is 88% of the maximum load capacity at the normal internal pressure.

[0026] The mark portion 2 includes a mark consisting of letters, figures, symbols, or a combination thereof, and particularly includes a trademark that functions as an identification sign indicating the tire manufacturer, tire brand, etc. Multiple mark portions 2 are arranged spaced apart in the tire circumferential direction. For example, in the configuration shown in FIG. 2 , a mark consisting of a combination of element 2A of the letters "YOKOHAMA" indicating the tire manufacturer and element 2B of a logo with a stylized "Y," the initial letter of the name, is applied to the surface of the tire side portion 18. A pair of mark portions 2 are arranged in opposing positions in the tire circumferential direction on the annular tire side portion 18.

[0027] The marking portion 2 has a radial height Ha [mm] of each element 2A relative to the tire cross-sectional height SH [mm] (see FIG. 1) in the range of 0.05≦Ha / SH≦0.80, and preferably in the range of 0.10≦Ha / SH≦0.70. This improves the visibility of the marking portion 2. The radial height Ha of the element 2A is measured as the maximum extension dimension of the element 2A in the tire radial direction.

[0028] The tire cross-sectional height SH is half the distance between the tire outer diameter and the rim diameter, and is measured with the pneumatic tire 1 mounted on a specified rim, a specified internal pressure applied, and no load applied.

[0029] The peripheral region 3 is a region surrounding the marking portion 2 and is formed on the surface of the tire side portion 18. The peripheral region 3 may be a smooth surface having a smooth surface, or may be an uneven surface that has been subjected to surface processing. In the embodiment, the peripheral region 3 is formed between a pair of narrow ribs 41, 42 that each extend in the tire circumferential direction and are positioned at different positions in the tire radial direction. This enhances the design of the tire side portion 18 of the pneumatic tire 1. Furthermore, the peripheral region 3 has an annular structure that extends around the entire circumference of the tire side portion 18 in the tire circumferential direction, and thus includes both of the pair of marking portions 2.

[0030] In the pneumatic tire 1 of the embodiment, the marking portion 2 and the peripheral region 3 are disposed radially outward of the tire maximum width position Ac. More specifically, the marking portion 2 and the peripheral region 3 are disposed in an area (see FIG. 1 ) from the tire ground contact edge T to the tire maximum width position Ac, with a pair of narrow ribs 41, 42 extending in the tire circumferential direction to define the peripheral region 3, and the marking portion 2 is disposed between these narrow ribs 41, 42. This increases the visibility of the marking portion 2 in the pneumatic tire 1. The pneumatic tire 1 is not limited to this configuration, and although not explicitly shown in the drawings, the marking portion 2 and the peripheral region 3 may be disposed within the tire side portion 18, including the tire maximum width position Ac, or may be disposed radially inward of the tire maximum width position Ac.

[0031] The tire maximum width position Ac is defined as the maximum width position of the tire section width within the tire side portion 18. The tire section width is measured as the linear distance in the tire width direction between the sidewalls, excluding irregularities such as the marking portion 2, the peripheral region 3, and patterns and letters such as the narrow ribs 41, 42 on the surface of the tire side portion 18, when the tire is mounted on a specified rim, pressurized to a specified internal pressure, and in an unloaded state.

[0032] The fine ribs 41, 42 have a width of 0.4 mm to 0.8 mm and a height from the surface of the tire side portion 18 of 0.1 mm to 1.0 mm, and function as a discharge path for residual air during tire vulcanization. This reduces the occurrence of vulcanization defects in the marking portion 2 and the surrounding area 3 of the pneumatic tire 1. In addition, in the pneumatic tire 1 of the embodiment, the fine rib 41 on the outer side in the tire radial direction is located at a mold split position of the tire molding die.

[0033] Furthermore, the marking portion 2 has a radial height Ha [mm] of the element 2A, relative to the spacing Hb [mm] of the fine ribs 41, 42 in the tire radial direction, in the range of 0.30≦Ha / Hb≦0.80, and preferably in the range of 0.40≦Ha / Hb≦0.70. Furthermore, in the pneumatic tire 1 of the embodiment, it is preferable that the marking portion 2 is disposed away from the pair of fine ribs 41, 42, as shown in Fig. 2. As a result, the visibility of the marking portion 2 in the pneumatic tire 1 is improved.

[0034] 3, 5, and 7 are enlarged views of a portion of the marking portion of the tire side portion shown in FIG. 2. FIG. 4 is a cross-sectional view (cross-sectional view taken along line AA in FIG. 3) of a portion of the marking portion shown in FIG. 3. FIG. 6 is a cross-sectional view (cross-sectional view taken along line BB in FIG. 5) of a portion of the marking portion shown in FIG. 7. FIG. 8 is a cross-sectional view (cross-sectional view taken along line CC in FIG. 7) of a portion of the marking portion shown in FIG. 3 to 8. For convenience, the ridges 7 arranged in the pattern portion 4 are simplified by hatching.

[0035] In the pneumatic tire 1 shown in Figures 3 and 4, the marking portion 2 (element 2A) is formed as a recessed portion 5 that is recessed into the peripheral region 3 in the tire side portion 18. That is, the marking portion 2 (element 2A) is formed such that the inner wall surface of the recessed portion 5 forms the contour line. In this pneumatic tire 1, the surface that forms the peripheral region 3 is a smooth surface, and a pattern portion 4, which will be described below, is provided on the smooth tire surface 5A that is the inner bottom of the recessed portion 5 of the marking portion 2 (element 2A).

[0036] In the pneumatic tire 1 shown in FIGS. 5 and 6, in the tire side portion 18, the marking portion 2 (element 2A) is formed as a convex portion 6 that protrudes from the surface with respect to the peripheral region 3. That is, the marking portion 2 (element 2A) is formed with the outer wall surface of the convex portion 6 as a contour line. In this pneumatic tire 1, the surface forming the protruding end of the convex portion 6 is a smooth surface, and a pattern portion 4, which will be described below, is provided around the convex portion 6 of the marking portion 2 (element 2A) on the tire surface 3A of the smooth peripheral region 3 (tire side portion 18).

[0037] In the pneumatic tire 1 shown in FIGS. 7 and 8, in the tire side portion 18, the marking portion 2 (element 2A) is formed as a convex portion 6 that protrudes from the surface with respect to the peripheral region 3. That is, the marking portion 2 (element 2A) is formed with the outer wall surface of the convex portion 6 as a contour line. In this pneumatic tire 1, the surface forming the protruding end of the convex portion 6 is a smooth surface, and a pattern portion 4, which will be described below, is provided on the tire surface 3A of the smooth peripheral region 3 (tire side portion 18) around the outer wall surface of the convex portion 6 of the marking portion 2 (element 2A).

[0038] Fig. 9 is an enlarged view of the pattern portion, and Fig. 10 is an enlarged partial cross-sectional view of the pattern portion (cross-sectional view taken along line DD in Fig. 9).

[0039] When the pattern portion 4 is formed on the tire surface 5A, which is the bottom surface of the recessed portion 5 that forms the outline of the marking portion 2 (element 2A) as shown in Figures 3 and 4, the pattern portion 4 is arranged at a position recessed from the peripheral region 3 as shown in Figure 10. When the pattern portion 4 is formed on the tire surface 3A in the peripheral region 3 that is around the protruding portion 6 that forms the outline of the marking portion 2 (element 2A) as shown in Figures 5 to 8, the pattern portion 4 is arranged at a position recessed from the protruding portion 6 as shown in Figure 10.

[0040] A plurality of ridges 7 are arranged in the pattern section 4 (4A) shown in Figure 9. The pattern section 4 has a plurality of element patterns 8 formed by the ridges 7. The plurality of element patterns 8 are formed by continuous ridges 7, and adjacent element patterns 8 are connected to each other by the ridges 7. As a result of adjacent element patterns 8 being connected to each other by the ridges 7 in this way, the pattern section 4 (4A) has a connected pattern 9 in which the plurality of element patterns 8 are connected in a predetermined direction.

[0041] The pattern unit 4 (4A) has a plurality of connection patterns 9. In a plan view of the pattern unit 4 (4A), the plurality of connection patterns 9 are arranged side by side in a direction intersecting the direction in which the plurality of element patterns 8 of the connection pattern 9 are arranged. That is, if the direction in which the plurality of element patterns 8 in the connection pattern 9 are arranged is defined as a first direction and the direction in which the plurality of connection patterns 9 are arranged is defined as a second direction, then in the pattern unit 4 (4A), the connection patterns 9 are arranged in the second direction, so that the plurality of element patterns 8 are arranged side by side not only in the first direction but also in the second direction.

[0042] Fig. 11 is a detailed view of the element pattern shown in Fig. 9. In Fig. 11, the second portion 7B of the ridge 7 is hatched to clearly distinguish the first portion 7A from the second portion 7B. The same applies to Figs. 13 and 14 described below.

[0043] The element pattern 8 of the connecting pattern 9 has ridges 7 forming the element pattern 8, each of which has a first portion 7A extending from the outside of the element pattern 8 toward the inside of the element pattern 8 in one direction along the extension direction of the ridge 7, and a second portion 7B extending from the inside of the element pattern 8 toward the outside of the element pattern 8. The first portion 7A and the second portion 7B of the ridge 7 forming one element pattern 8 are each formed in a spiral shape. In this embodiment, the element pattern 8 is formed in a substantially circular spiral shape by the first portion 7A and the second portion 7B of the ridge 7 being continuous. In this embodiment, the element pattern 8 has a triple spiral shape where three ridges 7 overlap at the most overlapping portion.

[0044] 11, which is the direction in which the ridge 7 forming the element pattern 8 extends, the first portion 7A extends from the outside of the element pattern 8 toward the inside of the element pattern 8 while rotating in a predetermined direction. In contrast, the second portion 7B extends from the inside of the element pattern 8 toward the outside of the element pattern 8 while rotating in the opposite direction to the direction in which the first portion 7A rotates in the direction in which the ridge 7 extends, which is the direction in which the ridge 7 extends, which is the direction in which the first portion 7A rotates.

[0045] The ridge 7 forming the element pattern 8 transitions from a first portion 7A to a second portion 7B near the center of the element pattern 8 in the extension direction of the ridge 7, and therefore the ridge 7 has a folded portion 7C where the extension direction of the ridge 7 changes near the center of the element pattern 8. The folded portion 7C is a portion where the first portion 7A and the second portion 7B are connected, and the ridge 7 forming the element pattern 8 is folded back at the position of the folded portion 7C in the extension direction of the ridge 7, and transitions from the first portion 7A to the second portion 7B in the extension direction of the ridge 7.

[0046] The multiple element patterns 8 in one connecting pattern 9 are formed by continuous ridges 7, and between adjacent element patterns 8, the ridge 7 extending from the second portion 7B of one element pattern 8 extends toward the first portion 7A of the other element pattern 8. As a result, the multiple element patterns 8 in one connecting pattern 9 are formed by one continuous ridge 7, and the pattern portion 4 (4A) has multiple connecting patterns 9 formed in this way.

[0047] In this embodiment, in connection patterns 9 adjacent to each other in the second direction, the element patterns 8 of the respective connection patterns 9 are arranged at positions different from each other in the first direction. Specifically, when the interval in the first direction between adjacent element patterns 8 in one connection pattern 9 is defined as one pitch, the element patterns 8 of adjacent connection patterns 9 are arranged at positions shifted from each other by half a pitch in the first direction.

[0048] In the pattern portion 4A(4) formed in this manner, the pitch H1 in the first direction between adjacent element patterns 8 in one connecting pattern 9 is preferably within a range of 0.2 mm to 2.5 mm. Also, in the pattern portion 4A(4), the interval H2 in the second direction between adjacent connecting patterns 9 is preferably within a range of 0.2 mm to 2.0 mm.

[0049] The ridges 7 forming the element patterns 8 in this manner are rib-like protrusions protruding from the tire surfaces 3A, 5A, as shown in Fig. 10, and are formed into triangular cross-sectional shapes that narrow from bases 7E of the tire surfaces 3A, 5A toward apexes 7D. It is preferable that the apexes 7D of the ridges 7 be pointed.

[0050] The ridges 7 forming the element pattern 8 preferably have a width W of the largest base 7E in the range of 0.03 mm to 0.3 mm. The width W of the ridges 7 is measured as the width in a cross section perpendicular to the direction in which the ridges 7 extend. Furthermore, the pitch P between the peaks 7D of adjacent ridges 7 is preferably 0.5 mm or less, and more preferably 0.25 mm or less. In this way, the pattern portion 4 in which the width W and pitch P of the ridges 7 are defined can improve the processability of the pneumatic tire 1 without hindering removal from the tire mold.

[0051] As described above, when the ridges 7 constituting the pattern portion 4 are formed on the tire surface 5A, which is the bottom surface of the recessed portions 5 constituting the outline of the marking portion 2 (element 2A), they are arranged in a position recessed from the peripheral region 3 as shown in Fig. 10. Furthermore, when the ridges 7 constituting the pattern portion 4 are formed on the tire surface 3A in the peripheral region 3, which is around the protruding portions 6 constituting the outline of the marking portion 2 (element 2A), as described above, they are arranged in a position recessed from the protruding portions 6 as shown in Fig. 10. In this configuration, as shown in Fig. 10, the height T of the ridges 7 from the tire surface 5A, 3A to the peaks 7D is preferably in the range of 0.1 mm to 1.5 mm, and more preferably in the range of 0.2 mm to 1.3 mm.

[0052] Thus, a pattern portion 4 having a height T of ridges 7 set to the above height T can improve the processability of a pneumatic tire 1 without hindering removal from a tire mold. Furthermore, as shown in FIG. 10 , the height T of ridges 7 from tire surfaces 5A, 3A to peaks 7D is preferably in the range of 0.5≦T / T0<1.0, and more preferably in the range of 0.7≦T / T0≦0.95, relative to the height T0 of recesses 5 and the height T0 of protrusions 6. A pattern portion 4 having this configuration can prevent foreign matter from coming into contact with ridges 7 and thus prevent damage to ridges 7, due to the height T0 of recesses 5 and the height T0 of protrusions 6.

[0053] Next, a method for determining the shape of an element pattern 8 consisting of a ridge 7 having a first portion 7A and a second portion 7B will be described. FIG. 12 is an explanatory diagram of a basic shape body 50 that is the basis of the element pattern 8. The element pattern 8 is first formed by setting the basic shape body 50 that is the basis of the element pattern 8, and then the shape is determined based on the basic shape body 50. The basic shape body 50 has an annular shape portion 51 and a base shape portion 52.

[0054] The basic shape body 50 has a plurality of annular shaped portions 51, each of which is formed in an annular shape. The plurality of annular shaped portions 51 each have a width determined as the width W of the ridge 7, and are similar in shape with a common center point CP and an equal pitch. In this embodiment, the element pattern 8 is formed in a substantially circular spiral shape, and therefore the plurality of annular shaped portions 51 are each formed in the shape of a circular ring, and are also formed in the shape of concentric circles with different diameters about the center point CP.

[0055] The base shape portion 52 has an outer peripheral shape similar to that of the annular shape portion 51, and is located inside the multiple annular shape portions 51 in the basic shape body 50. In this embodiment, the annular shape portion 51 is formed in the shape of a circular ring, so the base shape portion 52 has an outer peripheral shape that is circular. The center of the circular base shape portion 52 is located at the center point CP of the annular shape portion 51.

[0056] The base shape portion 52 and the multiple annular shape portions 51 have the same distance in the radial direction between adjacent base shape portions 52 and annular shape portions 51 and the same distance between adjacent annular shape portions 51. In this embodiment, the element pattern 8 has a triple spiral shape in which three ridges 7 overlap at the most overlapping portion, so the basic shape body 50 is composed of one base shape portion 52 and two annular shape portions 51.

[0057] When forming an element pattern 8 from a basic shape body 50, a division line S passing through the center point CP is set, and the basic shape body 50 is divided into two divided bodies 55 by the division line S.

[0058] 13 is an explanatory diagram showing a state in which two divided bodies 55 of a basic body 50 are shifted from each other. When the basic body 50 is divided into two divided bodies 55, the two divided bodies 55 are shifted from each other by one pitch of the annular portions 51. That is, the two divided bodies 55 of the basic body 50 are moved relatively along the division line S as shown by the arrows in FIG. 13, and the two divided bodies 55 are shifted from each other by one pitch of the annular portions 51. This connects the inner annular portion 51 of one divided body 55, the first divided body 55A, to the outer annular portion 51 of the other divided body 55, the second divided body 55B, and also connects the outer annular portion 51 of the first divided body 55A to the inner annular portion 51 of the second divided body 55B.

[0059] In addition, the base shape portion 52 connects the portion of the base shape portion 52 located in the first division 55A to the inner annular shape portion 51 in the second division 55B, and the portion of the base shape portion 52 located in the second division 55B to the inner annular shape portion 51 in the first division 55A.

[0060] As a result, the first portion 7A of the ridge 7 can be formed by the portion extending from the outer annular portion 51 of the first divided body 55A, through the inner annular portion 51 of the second divided body 55B, and to the base portion 52 of the first divided body 55A. The second portion 7B of the ridge 7 can be formed by the portion extending from the base portion 52 of the second divided body 55B, through the inner annular portion 51 of the first divided body 55A, and to the outer annular portion 51 of the second divided body 55B.

[0061] The first portion 7A and the second portion 7B that form the element pattern 8 are formed by dividing a basic shape body 50, which is made up of a plurality of annular shape portions 51 and base shape portions 52, into two at a dividing line S, and by shifting the two divided bodies 55 from each other by one pitch. As a result, the element pattern 8 is formed into a spiral shape in which the extension direction of the ridges 7 changes at the turning-back portions 7C.

[0062] 14 is an explanatory diagram showing a state in which a plurality of element patterns 8 are formed by continuous ridges 7. The shape of each of the plurality of element patterns 8 in one connecting pattern 9 is formed by this logic. Furthermore, between adjacent element patterns 8, the first portion 7A of the ridge 7 in one element pattern 8 and the second portion 7B of the ridge 7 in the other element pattern 8 are formed continuously. As a result, the plurality of element patterns 8 in one connecting pattern 9 are formed in a so-called unicursal shape, formed by continuous ridges 7.

[0063] The pattern portion 4 formed in this manner is preferably arranged on the tire surface 3A, 5A of the tire side portion 18 of the pneumatic tire 1 with the direction in which the element patterns 8 are arranged being determined appropriately depending on the shape, etc. of the marking portion 2. The pattern portion 4 may be arranged such that the directions in which the element patterns 8 in the multiple connecting patterns 9 are all aligned are the same, regardless of the position in the tire circumferential direction or tire radial direction, for example.

[0064] Alternatively, the element patterns 8 of the pattern portion 4 may be arranged such that the direction in which the plurality of element patterns 8 in the connect pattern 9 are arranged, i.e., the first direction, is the tire circumferential direction, and the direction in which the plurality of connect patterns 9 are arranged, i.e., the second direction, is the tire radial direction. In other words, the direction in which the plurality of element patterns 8 in the connect pattern 9 are arranged may be curved in an arc shape along the tire circumferential direction.

[0065] Furthermore, when the first direction in the connect pattern 9 is the tire circumferential direction and the second direction in which the plurality of connect patterns 9 are arranged is the tire radial direction, the element patterns 8 of each connect pattern 9 may be formed to have proportionally different sizes depending on their positions in the tire radial direction. In other words, the element patterns 8 of each connect pattern 9 may be formed to be proportionally larger as the element patterns 8 are arranged further outward in the tire radial direction.

[0066] This pneumatic tire 1 is manufactured using a tire molding die capable of transferring the above-described pattern portion 4 (4A) onto the surface of the tire side portion 18.

[0067] Specifically, the pneumatic tire 1 is manufactured, for example, by the following manufacturing process. First, tire components such as the bead wires that form the bead core 11, the carcass plies that form the carcass layer 13, the belt plies 141 to 143 that form the belt layer 14, the tread rubber 15, the sidewall rubber 16, and the rim cushion rubber 17 are placed in a molding machine to form a green tire (not shown). Next, the green tire of the pneumatic tire 1 is filled into a tire vulcanization mold (not shown) that includes a tire molding die. Next, the green tire of the pneumatic tire 1 is expanded radially outward by a pressure device and abuts against the tire molding die. Next, the tire vulcanization mold is heated, and rubber molecules of the green tire are bonded with sulfur molecules, thereby progressing vulcanization of the pneumatic tire 1. At this time, the shape of the molding surface of the tire molding die is transferred to the outer peripheral surface of the green tire, and the surface of the tire side portion 18 of the pneumatic tire 1 is formed. The tire after vulcanization is then removed from the tire vulcanization mold.

[0068] Furthermore, the pattern portion 4 (4A) on the tire surface 3A, 5A is formed by irregularities formed on the molding surface of the tire molding mold. The irregularities on the molding surface of the tire molding mold are formed, for example, by laser processing. That is, in the tire molding mold, the irregularities on the molding surface are formed by laser processing, with grooves corresponding to the first portion 7A, grooves corresponding to the folded portion 7C, and grooves corresponding to the second portion 7B. Furthermore, the multiple element patterns 8 of one linking pattern 9 are formed in a unicursal shape by continuous ridges 7, and therefore the respective grooves for forming the multiple element patterns 8 of one linking pattern 9 are formed by continuous laser processing.

[0069] A tire molding die in which each groove portion is formed by laser processing can mold the first portion 7A, the folded portion 7C, and the second portion 7B having the shapes described above. Furthermore, a tire molding die in which each groove portion is formed by laser processing has a rougher surface on the processed surface than a tire molding die in which each groove portion is machined, and therefore has good mold release properties even for the first portion 7A, the folded portion 7C, and the second portion 7B having the shapes described above, which contributes to improving the productivity of the pneumatic tire 1.

[0070] In the pneumatic tire 1 of the embodiment, the pattern portion 4A(4) disposed on the tire surface 3A, 5A has a plurality of element patterns 8 formed by ridges 7, and adjacent element patterns 8 are connected by the ridges 7. The element patterns 8 also have a first portion 7A extending from the outside of the element pattern 8 toward the inside of the element pattern 8 in one direction along the extension direction of the ridges 7, and a second portion 7B extending from the inside of the element pattern 8 toward the outside of the element pattern 8. Therefore, the plurality of element patterns 8 can disperse light irradiated onto the pattern portion 4A(4) by the first portion 7A and the second portion 7B of the ridges 7, thereby preventing the light irradiated onto the pattern portion 4A(4) from being reflected in a uniform direction. By preventing light from being reflected in a uniform direction, the pattern portion 4A(4) is blackened to make it appear black, thereby clarifying the contrast between the pattern portion 4A(4) and other portions without the pattern portion 4A(4). As a result, the visibility of the pattern portion 4A(4) can be improved.

[0071] Furthermore, the first portion 7A and the second portion 7B of the ridge 7 that form the element pattern 8 are each formed in a spiral shape, making it easy to form a shape that disperses light irradiated onto the pattern portion 4A(4). This makes it possible to blacken the pattern portion 4A(4) with the spiral-shaped first portion 7A and second portion 7B, thereby clarifying the contrast between the pattern portion 4A(4) and other portions where the pattern portion 4A(4) is not present. As a result, the visibility of the pattern portion 4A(4) can be improved.

[0072] Furthermore, the element pattern 8 is formed in a substantially circular spiral shape by the continuation of the first portion 7A and the second portion 7B, so that the light irradiated onto the pattern portion 4A(4) can be dispersed more reliably. This makes it possible to more reliably blacken the pattern portion 4A(4), and to clarify the contrast between the pattern portion 4A(4) and other portions where the pattern portion 4A(4) is not present. As a result, the visibility of the pattern portion 4A(4) can be improved.

[0073] Furthermore, the first portion 7A and the second portion 7B of the ridge 7 that form the element pattern 8 are formed in a shape in which two divided bodies 55 of a basic shape body 50 consisting of a plurality of annular-shaped portions 51 and a base-shaped portion 52 are shifted from each other by one pitch. This makes it possible to easily form the first portion 7A and the second portion 7B, which are oriented differently in the element pattern 8, in a continuous shape. This makes it possible to easily form the first portion 7A and the second portion 7B that can disperse light irradiated onto the pattern portion 4A(4), and the pattern portion 4A(4) can be blackened by the first portion 7A and the second portion 7B. This makes it possible to clearly contrast the pattern portion 4A(4) with other portions that do not have the pattern portion 4A(4), thereby improving the visibility of the pattern portion 4A(4).

[0074] Furthermore, in the pattern portion 4A(4), the width W of the ridges 7 is within a range of 0.03 mm to 0.3 mm, and the pitch P between adjacent ridges 7 is 0.5 mm or less. Therefore, as shown in FIG. 10 , in the pattern portion 4A(4), light L incident between adjacent ridges 7 is absorbed by multiple reflections from the apex 7D of the ridge 7 toward the base 7E and toward the tire surface 5A, 3A, causing the pattern portion 4A(4) to appear black. This clarifies the contrast between the pattern portion 4A(4) and other areas where the pattern portion 4A(4) is not present. As a result, the visibility of the pattern portion 4A(4) is improved, and the visibility of the marking portion 2 applied to the tire side portion 18 is also improved.

[0075] Furthermore, when the pattern portion 4A(4) is provided on the inner bottom of the recessed portion 5 of the marking portion 2 recessed from the tire surface 5A, the pattern portion 4A(4) can make the marking portion 2 recessed from the tire surface 5A stand out. As a result, the visibility of the marking portion 2 provided on the tire side portion 18 can be improved.

[0076] Furthermore, when the pattern portion 4A(4) is provided around the protrusions 6 of the marking portion 2 that protrudes from the tire surface 3A, the marking portion 2 that protrudes from the tire surface 3A can be made to stand out by the highly visible pattern portion 4A(4) that is arranged around the marking portion 2. As a result, the visibility of the marking portion 2 provided on the tire side portion 18 can be improved.

[0077] Furthermore, when the pattern portion 4A(4) is provided to outline the protrusions 6 of the marking portion 2 protruding from the tire surface 3A, the marking portion 2 protruding from the tire surface 3A can be made to stand out by being outlined with the highly visible pattern portion 4A(4). As a result, the visibility of the marking portion 2 provided on the tire side portion 18 can be improved.

[0078] [Variations] In the above-described embodiment, the element pattern 8 has a triple spiral shape in which three ridges 7 overlap, but the ridges 7 of the element pattern 8 may have a spiral shape other than a triple spiral shape.

[0079] FIG. 15 is an explanatory diagram showing a modified example of the pneumatic tire 1 according to the embodiment, in which the ridges 7 of the element pattern 8 are formed in a quadruple spiral. FIG. 16 is an explanatory diagram showing a modified example of the pneumatic tire 1 according to the embodiment, in which the ridges 7 of the element pattern 8 are formed in a double spiral. The ridges 7 of the element pattern 8 may have a quadruple spiral shape, in which four ridges 7 overlap at the most overlapping portion of the ridges 7 forming the element pattern 8, as in pattern section 4B(4) shown in FIG. 15. Alternatively, the ridges 7 may have a double spiral shape, in which two ridges 7 overlap at the most overlapping portion of the ridges 7 forming the element pattern 8, as in pattern section 4C(4) shown in FIG. 16. The number of spiral turns of the ridges 7 of the element pattern 8 is not important as long as they are formed in a spiral shape.

[0080] In the above-described embodiment, the element pattern 8 is formed in a substantially circular spiral shape, but the element pattern 8 may be formed in a shape other than a substantially circular spiral shape. The ridge 7 of the element pattern 8 may be formed, for example, in a substantially polygonal spiral shape by connecting the first portion 7A and the second portion 7B of the ridge 7.

[0081] FIG. 17 is an explanatory diagram showing a modified example of the pneumatic tire 1 according to the embodiment, in which the element pattern 8 is formed in a substantially rectangular spiral shape. FIG. 18 is an explanatory diagram showing a modified example of the pneumatic tire 1 according to the embodiment, in which the element pattern 8 is formed in a substantially rectangular spiral shape. The ridge 7 of the element pattern 8 may be formed in a substantially rectangular spiral shape by connecting the first portion 7A and the second portion 7B of the ridge 7, as in the pattern portion 4D(4) shown in FIG. 17 or the pattern portion 4E(4) shown in FIG. 18. That is, the element pattern 8 may be formed in such a manner that the ridge 7 having the first portion 7A and the second portion 7B is formed in a substantially quadrangular, specifically, square, spiral shape, as shown in FIGS. 17 and 18.

[0082] When the ridge 7 of the element pattern 8 is formed in a substantially square spiral shape, the element patterns 8 of the connecting pattern 9 may be formed so that the sides of the square are aligned along or perpendicular to the direction in which the element patterns 8 are arranged, as shown in Fig. 17. Alternatively, the element patterns 8 may be formed so that the diagonals of the square are aligned along or perpendicular to the direction in which the element patterns 8 are arranged, as shown in Fig. 18.

[0083] Furthermore, when the ridge 7 of the element pattern 8 is formed in a substantially quadrangular spiral shape, it may be formed in a shape other than a substantially square, for example, in a substantially rectangular spiral shape.

[0084] 19 is an explanatory diagram showing a modified example of the pneumatic tire 1 according to the embodiment, in which the element pattern 8 is formed in a substantially diamond-shaped spiral shape. When the ridge 7 of the element pattern 8 is formed in a substantially quadrangular shape, the element pattern 8 may have a shape other than a rectangle. For example, as in pattern portion 4F(4) shown in FIG. 19, the first portion 7A and the second portion 7B of the ridge 7 may be continuous to form a substantially diamond-shaped spiral shape.

[0085] By forming the element patterns 8 in such a substantially rectangular shape, the gaps between the element patterns 8 can be reduced, and the gaps between the ridges 7 can also be reduced, making it easier for the ridges 7 to disperse the light irradiated onto the pattern portion 4. This makes it possible to blacken the pattern portion 4 and clarify the contrast with other areas where there is no pattern portion 4, thereby improving the visibility of the pattern portion 4.

[0086] Furthermore, when the ridge 7 of the element pattern 8 is formed in a substantially polygonal spiral shape, the ridge 7 of the element pattern 8 may be formed in a spiral shape other than a substantially quadrangular shape.

[0087] 20 is an explanatory diagram showing a modified example of the pneumatic tire 1 according to the embodiment, in which the element pattern 8 is formed in a substantially hexagonal spiral shape. The ridge 7 of the element pattern 8 may be formed in a substantially hexagonal spiral shape by connecting a first portion 7A and a second portion 7B of the ridge 7, as in pattern portion 4G(4) shown in FIG. 20. When the ridge 7 of the element pattern 8 is formed in a substantially hexagonal spiral shape, the element patterns 8 of the multiple connecting patterns 9 can be arranged in a so-called honeycomb structure, and the element patterns 8 can be arranged with small gaps between them.

[0088] FIG. 21 is an explanatory diagram illustrating a modified example of the pneumatic tire 1 according to the embodiment, in which the element patterns 8 are formed in a substantially triangular spiral shape. The ridges 7 of the element patterns 8 may be formed in a substantially triangular spiral shape by connecting a first portion 7A and a second portion 7B of the ridge 7, as in the pattern portion 4H(4) shown in FIG. 21 . When the ridges 7 of the element patterns 8 are formed in a substantially triangular spiral shape, it is preferable that the triangles of the element patterns 8 of the connect patterns 9 adjacent to each other in the second direction be oriented in opposite directions, as shown in FIG. 21 . This allows the element patterns 8 to be arranged with small gaps between them, even when the ridges 7 of the element patterns 8 are formed in a substantially triangular spiral shape.

[0089] As described above, the element pattern 8 is formed in a substantially polygonal spiral shape by connecting the first portion 7A and the second portion 7B, thereby reducing the gaps between the element patterns 8. This allows for a large number of ridges 7 to be arranged by reducing the gaps between the ridges 7 that form the element pattern 8, making it easier to disperse light irradiated onto the pattern portion 4 by the large number of ridges 7. This allows the pattern portion 4 to be blackened more reliably, and the contrast with other portions where there is no pattern portion 4 can be made clearer. As a result, the visibility of the pattern portion 4 can be improved.

[0090] In the present embodiment, as described above, a pneumatic tire 1 has been described as an example of a tire. The pneumatic tire 1 can be filled with air, an inert gas such as nitrogen, or other gases. However, the configuration of the pattern portion of the pneumatic tire 1 described in the present embodiment 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.

[0091] [Example] 22 is a table showing the results of a performance evaluation test of the pneumatic tire 1. Hereinafter, a performance evaluation test will be described for the conventional pneumatic tire 1 and the pneumatic tire 1 according to the present invention. The performance evaluation test was a test on the visibility of the pattern portion.

[0092] In the visibility evaluation test, a test tire with a tire size of 255 / 35R19 (96Y) is mounted on a rim with a rim size of 19x9J, and the test tire is pressurized according to the JATMA standard. An inspector then visually inspects the tire side of the test tire from a distance of 5 m to perform a sensory evaluation of the visibility of the pattern, which is an index of the conspicuousness of the pattern. This evaluation is performed using an index evaluation with the comparative example as the standard (100), and the higher the value, the better.

[0093] The performance evaluation test was conducted on nine types of pneumatic tires, including a conventional pneumatic tire and Examples 1 to 8, which are pneumatic tires 1 according to the present invention. Of these, the conventional pneumatic tire has a pattern portion having a plurality of element patterns formed by ridges, but adjacent element patterns are not connected by a ridge.

[0094] In contrast, in Examples 1 to 8, which are examples of the pneumatic tire 1 according to the present invention, the pattern portion 4 all has a plurality of element patterns 8, and adjacent element patterns 8 are connected by a ridge 7, and the ridge 7 has a first portion 7A and a second portion 7B. Furthermore, the pneumatic tires 1 according to Examples 1 to 8 differ from one another in the spiral shape of the ridges 7 that form the element patterns 8, the width of the ridges 7, and the pitch of the ridges 7.

[0095] As a result of conducting a performance evaluation test using these pneumatic tires 1, it was found that the pneumatic tires 1 according to Examples 1 to 8 had pattern portions that were more noticeable than the conventional tire, and had higher visibility of the pattern portions, as shown in Fig. 22. In other words, the pneumatic tires 1 according to Examples 1 to 8 can improve the visibility of the pattern portions.

[0096] The present disclosure includes the following inventions. Invention[1] The tire has a pattern with multiple ridges on the surface. the pattern portion has a plurality of element patterns formed by the ridges, the plurality of element patterns are formed by the continuous ridges, and adjacent element patterns are connected to each other by the ridges; The tire is characterized in that the ridge forming the element pattern has a first portion extending from the outside of the element pattern toward the inside of the element pattern in one direction in the extension direction of the ridge, and a second portion extending from the inside of the element pattern toward the outside of the element pattern. Invention[2] The tire according to the invention [1], wherein the first portion and the second portion are each formed in a spiral shape. Invention[3] The tire according to invention [2], wherein the element pattern is formed in a substantially circular spiral shape by the first portion and the second portion being continuous with each other. Invention[4] The tire according to the invention [2], wherein the element pattern is formed in a substantially polygonal spiral shape by the first portion and the second portion being continuous with each other. Invention[5] The tire according to any one of inventions [1] to [4], wherein the first and second portions are formed by dividing a basic shape body, which includes a plurality of annular shaped portions of similar shapes that share a common center point and are spaced at equal intervals, and a base shaped portion whose outer circumferential shape is similar to the annular shaped portions and is located inside the plurality of annular shaped portions, into two divided bodies that are shifted from each other by one pitch, along a dividing line that passes through the center point. Invention[6] The pattern portion is A tire according to any one of inventions [1] to [5], wherein the width of the ridge is 0.03 mm or more and 0.3 mm or less, and the pitch between adjacent ridges is 0.5 mm or less. Invention[7] The pattern portion is The tire according to any one of the inventions [1] to [6], wherein the marking is provided on the inner bottom of a recessed portion recessed from the tire surface. Invention[8] The pattern portion is The tire according to any one of the inventions [1] to [6], wherein the marking is provided around the protrusion of the marking protruding from the tire surface. Invention[9] The pattern portion is The tire according to any one of the inventions [1] to [6], wherein the marking portion is provided around the convex portion of the marking portion protruding from the tire surface. [Explanation of symbols]

[0097] 1 pneumatic tire 2. Emblem Section 2A,2B elements 3. Surrounding Areas 3A Tire Surface 4(4A, 4B, 4C, 4D, 4E, 4F, 4G, 4H) Pattern section 5 recess 5A Tire Surface 6 Convex part 7 Ridge 7A Part 1 7B 2nd part 7C Folded section 7D Top 7E base 8-element pattern 9 Connecting Pattern 10 Bead section 11 Bead core 12 Bead filler 13 Carcass layer 14 Belt Layer 15 Tread rubber 16 Sidewall rubber 17 Rim cushion rubber 18 Tire side 20 rims 20a rim flange 41,42 Thin rib 50 Basic shapes 51 Annular shaped part 52 Base shape part 55 Split body 55A First division 55B Second division body

Claims

1. The tire has a pattern with multiple ridges on the surface. the pattern portion has a plurality of element patterns formed by the ridges, the plurality of element patterns are formed by the continuous ridges, and adjacent element patterns are connected to each other by the ridges; The element pattern is characterized in that the ridge forming the element pattern has a first portion extending from the outside of the element pattern toward the inside of the element pattern in one direction in the extension direction of the ridge, and a second portion extending from the inside of the element pattern toward the outside of the element pattern.

2. The tire of claim 1 , wherein the first portion and the second portion are each formed in a spiral shape.

3. The tire according to claim 2 , wherein the element pattern is formed in a substantially circular spiral shape by the first portion and the second portion being continuous with each other.

4. The tire according to claim 2 , wherein the element pattern is formed in a substantially polygonal spiral shape by the first portion and the second portion being continuous with each other.

5. 2. The tire according to claim 1, wherein the first portion and the second portion are formed by dividing a basic shape body, which includes a plurality of annular shaped portions of similar shapes that share a common center point and are spaced at equal intervals, and a base shaped portion whose outer circumferential shape is similar to the annular shaped portions and is positioned inside the plurality of annular shaped portions, along a dividing line that passes through the center point, and the two divided bodies are offset from each other by one pitch.

6. The pattern portion is 2. The tire according to claim 1, wherein the width of the ridge is 0.03 mm or more and 0.3 mm or less, and the pitch between adjacent ridges is 0.5 mm or less.

7. The pattern portion is The tire according to claim 1 , wherein the marking is provided on an inner bottom of a recessed portion recessed from the tire surface.

8. The pattern portion is The tire according to claim 1 , wherein the marking is provided around a protruding portion of the marking protruding from the tire surface.

9. The pattern portion is The tire according to claim 1, wherein the marking is provided by edging a convex portion of the marking that protrudes from the tire surface.

Images