Pneumatic tires and molds for molding pneumatic tires

Abstract

The present invention provides a pneumatic tire that can improve aesthetics by making the radial irregularities that occur on the tire side surface when the tire is inflated less noticeable, while also reducing the air resistance of the tire. [Solution] The tire 1 includes an arc-shaped decorative portion 100 formed in the circumferential direction of the tire on the tire side surface, which is the outer surface in the tire axial direction, located radially inward from the contact edge of the tread and radially outward from the rim line. The decorative portion 100 is provided with three or more triangular portions 103a, 103b, 103c. At least two sides of each triangular portion have widths d1, d2, d3 of 1.2 mm or more. Each triangular portion has one vertex A1, A2, A3 facing radially outward from the tire, and the tips of the vertex A1, A2, A3 are positioned radially outward from the outer end M in the tire axial direction, which defines the maximum width of the tire.

Description

Technical Field

[0001] The present invention relates to a pneumatic tire and a mold for molding a pneumatic tire. More specifically, the present invention relates to a pneumatic tire provided with an arcuate decorative portion formed on a tire side surface, which is an outer surface in the tire axial direction on the outer side in the tire radial direction from the rim line.

Background Art

[0002] In Patent Document 1, a rhombus plane and a triangle plane are laid out in a decorative area provided on the sidewall surface of a tire, and the intersection points at the tire radial direction ends of the planes arranged in the tire radial direction are protruding apexes protruding in the normal direction of the profile surface. A configuration is described. Thereby, a new visual effect is said to be produced.

[0003] In Patent Document 2, a large area formed by combining two triangular pyramids each composed of three small triangular areas is formed on the outer surface of the sidewall of a tire, and a plurality of large areas are formed along the tire circumferential direction and the tire radial direction. It is described that the arithmetic mean roughness of the three small areas is made different. Thereby, the appearance of the sidewall is said to be improved.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the configurations described in Patent Documents 1 and 2 each have room for improvement in terms of design, specifically in terms of making the irregularities that occur on the tire side surface in the radial direction during inflation (the process of filling the tire with air during molding) less noticeable and thus improving the aesthetic appeal. Furthermore, the configurations described in Patent Documents 1 and 2 each have room for improvement in terms of reducing the air resistance of the tire.

[0006] The object of the present invention is to provide a pneumatic tire and a mold for molding the same that can improve the design by making the radial irregularities that occur on the tire side surface when the tire is inflated less noticeable, and also reduce the air resistance of the tire. [Means for solving the problem]

[0007] The pneumatic tire according to the present invention is a pneumatic tire comprising an arc-shaped decorative portion formed in the circumferential direction of the tire on the tire side surface, which is the outer surface in the tire axial direction, located radially inward from the contact edge of the tread and radially outward from the rim line, wherein the decorative portion is provided with three or more triangular portions, each of at least two sides of the triangular portion having a width of 1.2 mm or more, each triangular portion having one apex facing radially outward from the outer end in the tire axial direction, and the tip of the apex is positioned radially outward from the outer end in the tire axial direction that defines the maximum width of the tire.

[0008] The mold for molding a pneumatic tire according to the present invention is a mold for molding a pneumatic tire according to the present invention, and has a plurality of recesses on the molding surface corresponding to a plurality of first protrusions. [Effects of the Invention]

[0009] According to the pneumatic tire and mold for forming the pneumatic tire of the present invention, three or more triangles having two sides inclined with respect to the tire's radial direction can be formed on the tire side surface. This makes the radial irregularities that occur on the tire side surface when the tire is inflated less noticeable, thereby improving the aesthetic appeal. Furthermore, when the decorative part is positioned on the outside of the vehicle when the tire is mounted, the airflow hitting the vicinity of the triangular parts causes turbulent separation, allowing the air to flow away from the tire and thus reducing the tire's air resistance. Also, when the decorative part is positioned on the inside of the vehicle when the tire is mounted, the airflow kicked up by the tire on the ground is drawn towards the center of the tire, promoting good airflow around the tire and further reducing the tire's air resistance. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows the tire contour shape in a meridional cross-section of a pneumatic tire, which is an example of an embodiment, and illustrates the extent to which the decorative part is formed. [Figure 2A] This figure shows an annular portion including two decorative parts applied to the tire side surface of a pneumatic tire according to the embodiment. [Figure 2B] This is an enlarged view of the upper part of Figure 2A. [Figure 3] This is an enlarged view of section A in Figure 2B. [Figure 4A] This figure shows the outer shape of the cross-section of the annular protrusion along the tire's radial direction. [Figure 4B] This figure corresponds to Figure 4A of the annular projection in another embodiment. [Figure 5A] This is an enlarged perspective view corresponding to section B in Figure 3. [Figure 5B] Figure 5A is an enlarged perspective view of a portion of the straight section shown, viewed from the radially outer side of the tire. [Figure 6] Figure 4 is a cross-sectional view of the DD. [Figure 7] This is an enlarged view of section E in Figure 6. [Figure 8]In an embodiment, it is a diagram showing a shape taken out and shown when viewed from the outside in a direction orthogonal to the protrusion formation reference plane in a part of the pattern area on the tire side surface. [Figure 9] In an embodiment, it is a cross-sectional view showing a mold for molding a pneumatic tire. [Figure 10] In an embodiment, it is a perspective view showing a part of a portion where recesses corresponding to a plurality of protrusions of a mold for molding a pneumatic tire are formed. [Figure 11] In a pneumatic tire according to another example of an embodiment, it is a cross-sectional view showing a plurality of protrusions formed so as to protrude from different surfaces of the tire side surface.

Embodiments for Carrying Out the Invention

[0011] Hereinafter, an example of an embodiment of a pneumatic tire and a mold for molding the same according to the present invention will be described in detail with reference to the drawings. The embodiments described below are merely examples, and the present invention is not limited to the following embodiments. Also, selectively combining the components of the following plurality of embodiments and modification examples is included in the present invention.

[0012] FIG. 1 is a diagram showing a tire contour shape in a meridian cross-section of a pneumatic tire 1 which is an example of an embodiment, and is a diagram showing a formation range of a decorative portion. As shown in FIG. 1, the pneumatic tire 1 includes a tread 10 which is a portion that contacts the road surface. Hereinafter, the "pneumatic tire 1" will be referred to as the "tire 1". The tread 10 has a tread pattern including a plurality of blocks and is formed in an annular shape along the tire circumferential direction. In the illustrated example, the tread 10 is shown as being formed of a single block, but actually, the tread 10 includes a plurality of blocks divided in the tire axial direction X. The plurality of blocks are divided by circumferential grooves extending in the tire circumferential direction. The tread 10 has a ground contact end T. In FIG. 1, the tire axial direction is indicated by X, and the tire radial direction is indicated by Y.

[0013] Hereinafter, as the structure of the tire 1, the part on the outer side (OUT side) of the vehicle centered on the central CL in the tire axial direction X will be described. However, the tire 1 includes the decorative part of the tire side surface described later, and is symmetric with respect to the central CL in the tire axial direction X between the outer part and the inner part of the vehicle of the tire 1.

[0014] The tire 1 is provided at an end on the outer side in the tire axial direction X from the tread 10, and includes a sidewall 12 that bulges most on the outer side in the tire axial direction X and a bead (not shown) fixed to the rim of the wheel. The sidewall 12 and the bead are formed in an annular shape along the tire circumferential direction. The sidewall 12 extends from both ends in the tire axial direction X of the tread 10 toward the inner side in the tire radial direction Y. At the inner end in the radial direction Y of the tire 1, a rim strip 18 that forms the outer surface of the bead is provided adjacent to the sidewall 12.

[0015] The tire 1 is a pneumatic tire filled with air at a predetermined pressure. The tread 10 is composed of tread rubber. The sidewall 12 is composed of a different type of sidewall rubber from the tread rubber.

[0016] In this specification, unless otherwise specified, the dimensions of each part of the tire are the dimensions measured in the unloaded normal state where the unused tire is mounted on the normal rim and filled with air to the normal internal pressure.

[0017] The "ground contact end T" means both ends in the tire axial direction X of the region that contacts the flat road surface when a load of 88% of the normal load at the normal internal pressure is applied in a state where the unused tire 1 is mounted on the normal rim and filled with air to the normal internal pressure.

[0018] Here, "standard rim" refers to the rim defined by the tire standard, which is "standard rim" for JATMA, "Design Rim" for TRA, and "Measuring Rim" for ETRTO. "Standard internal pressure" is "maximum air pressure" for JATMA, the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" for TRA, and "INFLATION PRESSURE" for ETRTO. "Standard load" is "maximum load capacity" for JATMA, the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" for TRA, and "LOAD CAPACITY" for ETRTO.

[0019] The tire 1 comprises a carcass, a belt layer, and an inner liner. The carcass is a cord layer covered with rubber, forming the skeleton of the tire 1 that can withstand loads, impacts, air pressure, etc. The belt layer is a reinforcing band placed between the tread rubber 11 and the carcass. The belt layer tightens the carcass and increases the rigidity of the tire 1. The belt layer is formed by multiple belts overlapping in the tire radial direction Y. Each belt is formed by multiple cords covered with rubber, arranged in a direction inclined with respect to the tire circumferential direction. In adjacent belts, the cords are inclined in opposite directions with respect to the tire circumferential direction so that they intersect with each other. The cords are made of steel or the like.

[0020] Between the belt layer and the tread rubber, a belt reinforcement layer is provided that extends in the circumferential direction of the tire and covers the entire belt layer in the axial direction X of the tire. The belt reinforcement layer is formed by covering cords that extend substantially in the circumferential direction of the tire with rubber. The cords are made of organic fibers or the like.

[0021] In this embodiment, the mounting direction of tire 1 on the vehicle is not specified. On the other hand, Figure 1 shows, for convenience, the case in which tire 1 is mounted on the vehicle with the right side facing the outside (OUT side) and the left side facing the inside (IN side).

[0022] A rim protector 19 is provided as part of the rim strip rubber that forms the rim strip 18, projecting outward in the tire axial direction. A rim line 20 is provided in an annular shape along the tire circumferential direction at the apex located at the outer end of the rim protector 19 in the tire axial direction. The rim protector 19 has the function of protecting the rim from damage. The rim line 20 is a line used to confirm that the tire 1 is mounted on the rim in the correct position by checking the gap between the tire and the rim. In Figure 1, a rim protector 19 is provided, but a configuration without a rim protector 19 is also possible, as shown by the dashed line in Figure 1. Even in this case, a rim line, which is an annular projection projecting outward in the tire axial direction, is provided on the side of the tire to confirm that the tire 1 is mounted on the rim in the correct position.

[0023] In this example, a decorative portion including three or more triangular sections is provided on the tire side surface 13, which is the outer surface in the tire axial direction X, located radially Y inward from the contact edge T of the tread 10 and radially Y outward from the rim line 20.

[0024] Figure 2A shows an annular portion 102 including two decorative parts 100 and 101 applied to the tire side surface 13 of tire 1. Figure 2B is an enlarged view of the upper part of Figure 2A. As shown in Figures 2A and 2B, an annular portion 102 with a constant radial length is provided on the tire side surface 13 facing the tire axis direction, whether on the outside or inside of the vehicle. The annular portion 102 includes decorative parts 100 and 101, which are pattern-forming parts that face each other in the diametrical direction. The two decorative parts 100 and 101 are identical in shape and are spaced apart from each other in the tire circumferential direction. Specifically, the two decorative parts 100 and 101 are formed with the tire circumferential center Ce (Figure 2B) being a position where the phase of the circumferential direction of the tire differs by 180 degrees from each other. Each of the two decorative sections 100 and 101 includes five triangular sections 103a, 103b, and 103c, multiple straight sections 104a, 104b, 104c, and 104d, multiple arc-shaped sections 105a and 105b, multiple L-shaped sections 106a, 106b, 106c, and 106d, and multiple concave sections 107a and 107b, and a rhombus-shaped section 108. Each of the triangular sections 103a, 103b, and 103c, the straight sections 104a, 104b, 104c, and 104d, the L-shaped sections 106a, 106b, 106c, and 106d, and the concave sections 107a and 107b constitutes a pattern area. Each pattern area has a shape based on straight lines, with multiple protrusions arranged on the inside. Multiple protrusions are also arranged on the inside of the rhombus-shaped section 108.

[0025] In the annular portion 102, a mark portion 120 is formed in the region between the two decorative portions 100 and 101. The mark portion 120 is formed by multiple protrusions that form multiple characters. The mark portion 120 may also include symbols and numbers.

[0026] As will be explained in more detail later, each of the multiple protrusions arranged in each pattern area and rhombus-shaped section 108 is a polygonal shape having a first surface which is a smooth surface that serves as a light-reflecting surface, and a second surface which is connected to the first surface at its apex and forms a shadow. As a result, as will be described later, a strong contrast can be created on the tire side surface 13 between the light-reflecting surface and the shadowed area such as the black line, thereby realizing a highly designed tire 1 that can produce an excellent shine by utilizing light reflection.

[0027] Furthermore, in this example, the ratio of the tire circumferential lengths L1 and L2 (Figure 2A) of each decorative part 100 and 101 to the total tire circumferential length of the tire side surface 13 at the same position as the tire radial position of each decorative part 100 and 101 is between 25% and 45%. This makes the pattern portion having three or more triangular parts stand out across the entire tire, thereby further improving the design of the tire 1. It also makes the tire radial irregularities that occur on the tire side surface 13 when the tire 1 is inflated less noticeable, further improving the design of the tire 1.

[0028] Figure 3 is an enlarged view of section A in Figure 2B. Figure 4 is an enlarged perspective view corresponding to section B in Figure 3.

[0029] As shown in Figures 2A and 2B, each decorative part 100, 101 has a symmetrical shape on both sides of the tire circumferential direction with respect to the tire circumferential center Ce. Hereinafter, each decorative part 100, 101 will be described mainly using decorative part 100 as a representative example. In decorative part 100, the five triangular parts 103a, 103b, and 103c consist of a first triangular part 103a located at the tire circumferential center Ce, and two second triangular parts 103b and two third triangular parts 103c arranged on each side of the tire circumferential center Ce. The first triangular part 103a, the second triangular part 103b, and the third triangular part 103c are of different sizes. The central first triangular part 103a is the largest, followed by the second triangular parts 103b at both ends, and then the third triangular part 103c in the middle, in that order of decreasing size.

[0030] Each of the multiple triangular sections 103a, 103b, and 103c has at least two sides that form a group of protrusions consisting of a straight groove 109 (Figure 5A) and multiple first protrusions 31 (Figure 5A) projecting from the bottom surface 110 (Figure 5A) of the groove 109, with widths d1, d2, and d3 of 1.2 mm or more. In Figure 3, each of the triangular sections 103a, 103b, and 103c has two straight sections formed by the group of protrusions that are connected at an acute angle to form an inverted V-shaped mountain section 122a, 122b, and 122c, such that each triangular section 103a, 103b, and 103c has vertices A1, A2, and A3 facing outward in the radial direction of the tire. Furthermore, the tips of the vertices A1, A2, and A3 of each mountain section 122a, 122b, and 122c are positioned radially outward from the outer end in the axial direction of the tire (the dashed line M in Figure 3) which defines the maximum width of the tire.

[0031] Of the first triangular portion 103a, the inner end of the V-shaped portion 122a in the tire radial direction is connected to the side surface 119 (Figure 4A) of an annular projection 111 formed on the tire side surface 13 so as to follow the tire circumferential direction.

[0032] Figure 4A shows the cross-sectional shape of the annular projection 111 along the tire radial direction. As shown in Figure 4A, the projection 111 has a substantially trapezoidal cross-section with a flat portion 112 facing in the tire axial direction. The projection 111 has edges E1 and E2 at the outer and inner ends of the flat portion 112 in the tire radial direction. The side surfaces 119 on both sides of the projection 11 in the tire radial direction are curved surfaces that are recessed toward the inner surface of the tire. As a result, one side of the first triangular portion 103a is formed by a part of the projection 111 located at the inner end of the first triangular portion 103a in the tire radial direction, having a flat portion 112 at its outer end in the tire axial direction, and having edge E1 at the outer end of the flat portion 112 in the tire radial direction. Therefore, when the protruding portion 111 is viewed from the outside in the tire axial direction, the difference in brightness between the flat portion 112 and the side surface 119 at the outer end in the tire radial direction becomes large. Combined with the fact that the two sides of the first triangular portion 103a are composed of a group of protrusions, each side of the first triangular portion 103a becomes more conspicuous.

[0033] Figure 4B is a diagram corresponding to Figure 4A of an annular projection 111a in another embodiment. It is a diagram corresponding to Figure 4A of the projection 111a. As shown in Figure 4B, the projection 111a may have a rectangular cross-section with a flat portion 112a facing in the tire axial direction and an edge E1 at the outer end of the flat portion 112a in the tire radial direction. This provides the same effect as the projection 111 in Figure 4A.

[0034] Furthermore, on the tire side surface 13, an annular projection 11b is formed on the radially outer side of the projection 111, extending outward from the outermost radial ends of the decorative parts 100 and 101, and following the circumferential direction of the tire. The other shapes of the projection 111b are the same as those of the projection 111.

[0035] As shown in Figure 3, the third triangular section 103c has its inner end in the tire radial direction of the V-shaped section 122c connected to the side surface 119 (Figure 4A) of the protruding section 111. The shape of the V-shaped section 122c is the same as that of the V-shaped section 122a, except for its smaller size. In this way, the inner ends in the tire radial direction of the V-shaped sections 122a and 122c that form the first triangular section 103a and the third triangular section 103c are connected to the annular protruding section 111 to form a triangular shape. As a result, the arc-shaped portions of the protruding section 111 that are connected to each of the V-shaped sections 122a and 122c and form a triangular shape also form the decorative section 100. Furthermore, the V-shaped portions 122a and 122c of the first triangular portion 103a and the third triangular portion 103c may not be connected to the protruding portion 111, but may be connected by a straight portion located inside the inner end of the V-shaped portion, similar to the second triangular portion 103b described later, or by an arc-shaped portion to form a triangular shape.

[0036] On the other hand, the second triangular section 103b has a V-shaped section 122b, similar to the first triangular section 103a, but the inner end of the V-shaped section 122b in the tire radial direction is set back radially from the side surface of the protruding section 111. Between the inner ends of the V-shaped section 122b in the tire radial direction, a straight section 103d having a width similar to the width d2 of the V-shaped section 122b is arranged. Both longitudinal ends of the straight section 103d are positioned close to the inner ends of the V-shaped section 122b in the tire radial direction. The V-shaped section 122b and the straight section 103d form a triangular shape. The straight section 103d is formed by a group of protrusions, similar to the straight section of the V-shaped section 122a.

[0037] The three or more triangular sections 103a, 103b, and 103c are not arranged adjacent to each other in the circumferential direction of the tire. This prevents the multiple triangular sections 103a, 103b, and 103c, which exhibit significant shape variations, from being densely arranged, thereby improving the appearance of the tire while suppressing the occurrence of cracks. In addition, although the multiple triangular sections 103a, 103b, and 103c are generally equilateral triangles, at least some of the triangular sections may be other than equilateral triangles. For example, some or all of the triangular sections may be triangular in a shape that is longer in the circumferential direction of the tire or longer in the radial direction of the tire than an equilateral triangle.

[0038] Next, the first projection 31, which constitutes two sides of the first triangular section 103a, will be explained using Figures 5A to 8. Figure 5A is an enlarged perspective view corresponding to section B in Figure 3. Figure 5B is an enlarged perspective view of a part of the straight section 124 shown in Figure 5A, viewed from the radially outer side of the tire. Figure 6 is a cross-sectional view of section DD in Figure 4. Figure 7 is an enlarged view of section E in Figure 6.

[0039] The first projections forming two sides of the second triangular section 103b and the third triangular section 103c are smaller than the first projection 31 of the first triangular section 103a, and the pitch, which is the distance between the vertices of adjacent first projections in the second triangular section 103b and the third triangular section 103c, is also smaller than the pitch of the first projection 31 of the first triangular section 103a. Otherwise, the same applies to the first projection 31 of each triangular section 103a, 103b, and 103c.

[0040] As shown in Figure 5A, the multiple first protrusions 31 are positioned inside the straight sections 124 that form two sides of the V-shaped section 122a of the first triangular section 103a. As shown in Figures 5A and 5B, the straight sections 124 of the V-shaped section 122a include a groove 109 and the multiple first protrusions 31 positioned inside the groove 109. The groove 109 is recessed from the tire sidewall reference surface 14 toward the inner surface of the tire and extends in a direction inclined with respect to the tire radial direction with substantially the same width.

[0041] The sidewall reference surface 14 refers to the surface of the sidewall 12 facing outward in the tire axial direction, in the portion of the tire side surface 13 where no protrusions such as side blocks or partial irregularities such as grooves 109 are formed.

[0042] Multiple first protrusions 31 are formed to rise from the bottom surface 110 of the groove 109. The bottom surface 110 of the groove 109 is the reference surface for protrusion formation and is part of the tire side surface 13.

[0043] As shown in Figure 5A, the multiple first protrusions 31 are arranged in a first direction K1 along the extension direction of the straight section 124. As shown in Figure 5B, each protrusion 31 has a six-faced polygonal shape with two first faces 33, two second faces 34, and two third faces 35. In addition, on both sides of each of the multiple protrusions 31, in the direction of the dashed line K2, which is a second direction slightly inclined with respect to the direction of arrow J in Figure 5A, which is the circumferential direction of the tire, there are also first protrusions 31a that have the shape of a part of the first protrusion 31. The first protrusion 31a has the shape of a part of the first protrusion 31, is cut by the wall surface 109a of the groove 109, and has a six-faced partial shape that is connected to the wall surface 109a at the cut portion. The shape of the six-faced first protrusion 31 will be described in detail below.

[0044] As shown in Figure 5A, each first projection 31 has two smooth second surfaces 34 that form a wide V-shape when viewed from the outside in a direction perpendicular to the bottom surface 110 of the groove 109. Also, as shown in Figure 5B, each second surface 34 has a shape in which the first surface 33 is connected to the outer side in the tire radial direction by a ridge line 36 that forms the apex. More specifically, each first projection 31 is a polygon having two identical rectangular first surfaces 33 (Figure 5B) connected to each other in a V-shape, and two identical rectangular second surfaces 34 connected to each of the two first surfaces 33 by a ridge line 36 and connected to each other in a V-shape. In addition, each first projection 31 has two identical triangular third surfaces 35 connected to both ends in the longitudinal direction along the direction of the V-shaped ridge line 36. Each first projection 31 is symmetrical on both sides with respect to the center in the second direction (the dashed line K2 direction in Figure 5A). As shown in Figure 5A, the shapes of the two second surfaces 34, when viewed from each first projection 31 in a direction perpendicular to the bottom surface 110 of the groove 109, are rhombic. The depth of the groove 109 to the bottom surface 110 can be made approximately the same throughout.

[0045] Furthermore, as shown in Figures 6 and 7, each first surface 33 of each first projection 31 is erected from the bottom surface 110 of the groove 109 at an angle α (Figure 7) within a range of ±15% from a surface S1 (Figure 7) that is upright at 90 degrees to the bottom surface 110 of the groove 109. In addition, each second surface 34 of each first projection 31 is connected to the first surface 33 by a ridge line 36 and rises up to be inclined at an angle β (Figure 7) greater than 90 degrees + 15% from the bottom surface 110. In this way, each first surface 33 of each first projection 31 is erected from the bottom surface 110 of the groove 109 at an angle within a range of ±15% from a surface S1 that is upright at 90 degrees to the bottom surface 110 of the groove 109, which makes it easier to create a difference in brightness on the tire side surface 13 and maintains good moldability of the tire 1.

[0046] Each first surface 33 of the first projection 31 shown in Figure 7 is erected from the base surface 110 at the same angle α as the surface S1 which is upright at 90 degrees to the base surface 110. However, it may be erected from the base surface 110 at an angle greater than 90 degrees or at an angle less than 90 degrees, within the range of 90 degrees ± 15%. In addition, each second surface 34 of each first projection 31 may be inclined and risen from the base surface 110 at an angle greater than 90 degrees + 30%, or more preferably at an angle greater than 90 degrees + 50%.

[0047] As a result, on the tire side surface 13, the second surface 34 forms a light-reflecting surface, and the first surface 33 creates shadows such as black lines, thereby giving the tire side surface 13 a strong contrast. Therefore, by utilizing light reflection, the tire side surface 13 can be given an excellent shine, making it possible to realize a highly aesthetically pleasing tire 1. Furthermore, as will be described later, at multiple positions on the bottom surface 110 shown in Figure 5A, rectangular areas such as rhombuses can be formed in the areas surrounded by the four second surfaces 34. When viewing the tire side surface 13, these rectangular areas have a brightness intermediate between that of the second surface 34 and the shadows such as black lines.

[0048] The height H of each first projection 31 (Figure 7) is, for example, 0.15 mm or more and 0.5 mm or less. For example, as shown in Figure 6, the area near the top of the first projection 31 can be made to protrude outward from the opening end 109b of the groove 109. For example, the portion of the first projection 31 including the top can protrude outward from the opening end 109b by about 0.1 mm.

[0049] Furthermore, as shown in Figure 5A, etc., when viewed from the outside in a direction perpendicular to the bottom surface 110 of the groove 109, the edges 36 of each second surface 34 are parallel to each other at two adjacent first protrusions 31 in the first direction (the dashed line K1 direction in Figure 5A). Also, the edges 36 of the second surface 34 on the other side of the second direction (the right side in Figure 5) are parallel to each other at the first protrusion 31 on one side of the first direction (the lower side in Figure 5) and the first protrusion 31a adjacent to the first protrusion 31 on the other side of the first direction (the upper side in Figure 5) in the second direction (the left side in Figure 5A). In this case, the two adjacent first protrusions 31, 31a in the second direction face each other with a minute gap of, for example, about 0.1 mm between them. The line of this minute gap forms a black line, which can accentuate the contrast with the reflective surface.

[0050] In this state, when viewed from the outside in a direction perpendicular to the bottom surface 110 of the groove 109, a rhombus is formed on the bottom surface 110 in the area enclosed by the three first protrusions 31, 31a, and these rhombuses are arranged so that at least multiple rhombuses are lined up in the first direction. This makes it possible to form a regular pattern inside at least a part of the pattern area including the straight section 124, in which rhombuses formed by one of the second faces 34 of the first protrusion 31 and rhombuses on the bottom surface 110 are arranged alternately along the first direction. In addition, in at least a part of the pattern area including the straight section 124, by widening the width of the straight section 124 or reducing the size of each first protrusion 31, it is also possible to arrange multiple first protrusions 31 with six faces in each of the intersecting first and second directions.

[0051] Furthermore, some pattern areas, such as the arc-shaped portions 105a, 105b, the L-shaped portions 106a, 106b, 106c, 106d, and the concave portions 107a, 107b, have circumferential portions that extend in the circumferential direction of the tire. In these circumferential portions, multiple first protrusions 31, each having six faces, are arranged along a second direction inclined with respect to the circumferential direction of the tire.

[0052] Figure 8 shows, in an embodiment, the shape of a portion of the patterned area of ​​the tire side surface 13 as viewed from the outside in a direction perpendicular to the bottom surface 110, which is the reference surface for forming the groove protrusions. The patterned area is formed by the projection of either the first protrusion 31, or the second or third protrusions described later, from the bottom surface of the groove. It is not limited to the first protrusion 31, but for the sake of explanation, the protrusion shown in Figure 8 will be described as the first protrusion 31. In Figure 10, the bottom surface 110 is shown by the sandy area. The thick straight line d represents the gap between adjacent first protrusions 31. Note that the names of the first, second, and third protrusions are changed for convenience depending on the type of part in which the protrusion is formed, and each protrusion may have the same shape or may have different shapes from one another.

[0053] As shown in Figure 8, the minimum distance between the intersection points G of the edges 36 of the two second faces 34, which are the vertices of each first projection 31, is defined as the pitch P. The pitch P is, for example, between 1.0 mm and 5.0 mm. The pitch P changes, for example, according to the difference in width of the straight sections that make up the triangular section. That is, the pitch P in the straight section of the first triangular section 103a, which has the largest width, is greater than the pitch in the straight section of the third triangular section 103c, which has the smallest width.

[0054] In Figures 2B and 3, the L-shaped sections 106a, 106b, 106c, 106d, the straight sections 104a, 104b, the arc-shaped sections 105a, 105b, and the concave sections 107a, 107b also have different pitches P for multiple protrusions depending on the width, similar to the straight sections of each triangular section 103a, 103b, 103c. For example, smaller protrusions are placed in the narrower straight sections, and larger protrusions are placed in the wider straight sections. Also, the pitch, which is the distance between the tops of adjacent protrusions, changes according to the change in the size of the protrusions. On the other hand, the pitch P for multiple protrusions may be made the same in the straight sections with different widths.

[0055] Returning to Figure 3, a rhombic section 108, which is an inner pattern section, is formed on the inside of the three sides of the first triangular section 103a. The rhombic section 108 is positioned such that the apex of the V-shaped section, where two sides are connected at an acute angle, faces outward in the radial direction of the tire. The rhombic section 108 is composed of a rhombic groove and a plurality of second protrusions projecting from the bottom surface of the groove in the axial direction of the tire.

[0056] The second projection has the same shape as the first projection 31, which is located in one of the first, second, or third triangular sections 103a, 103b, or 103c. Multiple second projections are arranged side by side within the rhombic section 108. A smooth surface 126 is placed between the first triangular section 103a and the rhombic section 108 formed inside the first triangular section 103a. This makes the first triangular section 103a more conspicuous.

[0057] Furthermore, since a rhombic portion 108 is formed on the inside of the first triangular portion 103a as an inner pattern portion, the area of ​​the sharp-angled smooth surface on the inside of the first triangular portion 103a is reduced, and bare metal during vulcanization can be suppressed.

[0058] Furthermore, an inner triangular section 128, which is an inner pattern section composed of multiple second protrusions, is formed on the inside of the three sides of the second triangular section 103b. The inner triangular section 128 is approximately similar in shape to the second triangular section 103b and is smaller than the second triangular section 103b. The inner triangular section 128 is arranged at approximately equal intervals along each side and the entire circumference of the second triangular section 103b. The inner triangular section 128 is composed of a triangular groove and multiple second protrusions projecting from the bottom surface of the groove in the direction of the tire axis. The multiple second protrusions of the second triangular section 103b are similar to the multiple second protrusions of the rhombic section 108. Because the inner triangular section 128 is formed on the inside of the second triangular section 103b as an inner pattern section, the area of ​​the sharp-angled smooth surface on the inside of the second triangular section 103b is reduced, and bareing during vulcanization can be suppressed.

[0059] A smooth surface 129 is positioned between the second triangular section 103b and the inner triangular section formed inside the second triangular section 103b. This makes the second triangular section 103b more prominent.

[0060] Furthermore, an outer edge pattern portion extending in the tire circumferential direction is formed at the outermost end of the decorative portion 100 in the tire radial direction. Specifically, at the outermost end of the decorative portion 100 in the tire radial direction, arc-shaped portions 105b and L-shaped portions 106a and 106b are arranged on both sides with respect to the tire circumferential center Ce, respectively, as outer edge pattern portions. This allows the outer edge pattern portion to suppress bareing near the edge of the tread rubber in a structure where the side of the tread rubber overlaps the outside of the sidewall rubber.

[0061] The arc-shaped portion 105b and the arc-shaped portions 106a and 106b are composed of an arc-shaped groove and a plurality of third projections that protrude from the bottom surface of the groove in the direction of the tire axis. The third projections have the same shape as the first projections 31 which are located in any of the first, second, or third triangular portions 103a, 103b, or 103c. The plurality of third projections are arranged in a line on the inside of the arc-shaped portion 105b and the arc-shaped portions 106a and 106b.

[0062] Furthermore, it is preferable that the radial height of each of the three or more triangular sections 103a, 103b, and 103c is 40% or more of the radial height Ha (Figure 3) of the decorative section 100. In this specification, when specifying the height, circumferential length, side length, etc. of each triangular section 103a, 103b, and 103c, since each side of each triangular section 103a, 103b, and 103c has a width, the length is specified using the outer edge of each triangular section 103a, 103b, and 103c.

[0063] For example, among the five triangular sections 103a, 103b, and 103c, the tire radial height H3 (Figure 3) of each third triangular section 103c is the smallest. Therefore, it is preferable that the tire radial height H3 of each third triangular section 103c is 40% or more of the tire radial height Ha of the decorative section 100. When defining the tire radial height Ha, the outermost tire radial end is the outermost end of the decorative section 100 in the tire radial direction, as shown by the outermost end of the range indicated by arrow Ha in Figure 3. In this case, the decorative section 100 does not include the protruding section 111b (Figure 3). This makes each triangular section 103a, 103b, and 103c more prominent, and the radial irregularities that occur when the tire is inflated become less noticeable. In this case, it is preferable that the radial height Ha of the decorative section 100 is 18% or more of the tire cross-sectional height Ht (Figure 1).

[0064] Furthermore, it is preferable that the three or more triangular sections 103a, 103b, and 103c do not overlap when viewed in the radial direction of the tire, and that the circumferential length of each of them is 10 mm or more. Specifically, among the five triangular sections 103a, 103b, and 103c, the circumferential length W3 (Figure 3) of each third triangular section 103c is the smallest. For this reason, it is preferable that the circumferential length W3 of each third triangular section 103c is 10 mm or more. This increases the proportion that the multiple triangular sections 103a, 103b, and 103c occupy in the circumferential range of the decorative section 100, making the multiple triangular sections 103a, 103b, and 103c more conspicuous, and making the radial irregularities that occur when the tire is inflated less noticeable. In this case, it is more preferable that the ratio of the tire circumferential length L1 (Figure 2A) of the decorative part 100 to the total circumferential length of the tire side surface 13 at the same position as the decorative part 100 in the tire radial direction is 45% or less, as this increases the proportion of the multiple triangular parts 103a, 103b, and 103c that occupy in the circumferential direction relative to the circumferential length of the decorative part 100.

[0065] Furthermore, each triangular section 103a, 103b, and 103c may be configured such that at least one of its three sides is 10 mm or longer.

[0066] Furthermore, the decorative part 100 may be formed on the tire side surface 13, with the tire filled with air pressure according to JATMA regulations, within a tire radial Y range of 35% to 80% of the tire radial height Ht when the tire cross section height Ht is 100, with reference to the position of the nominal rim diameter.

[0067] According to the tire 1 of this embodiment, three or more triangles having two sides inclined with respect to the tire's radial direction can be formed on the tire side surface 13. This makes the radial irregularities that occur on the tire side surface 13 when the tire 1 is inflated less noticeable, thereby improving the aesthetic appearance. Furthermore, when the decorative parts 100 and 101 are positioned on the outer surface of the tire in the axial direction when the tire is mounted on the vehicle, the vertices A1, A2, and A3 of each triangular part 103a, 103b, and 103c of the upper decorative part 100 may be positioned facing upward, as shown in Figures 2A and 2B. In this case, the tips of the vertices A1, A2, and A3 of each triangular part 103a, 103b, and 103c are positioned radially outward from the outer end in the tire's axial direction (the dashed line M in Figure 3). As a result, the airflow strikes the vicinity of the tips of each triangular section 103a, 103b, and 103c, causing turbulent flow separation. This allows the air to flow away from the tire, as indicated by arrow B1 in Figure 2A, thereby reducing the tire's air resistance.

[0068] Furthermore, when the decorative parts 100 and 101 are positioned on the inner surface of the tire in the axial direction when the tire is mounted on the vehicle, the vertices of each triangular part of the lower decorative part 101 may be positioned facing downwards, as shown in Figure 2A. In this case, on the inner surface of the tire in the axial direction, the airflow is easily stirred up by the tire on the ground. However, with tire 1, the stirred-up airflow is drawn towards the center of the tire along the sides of each triangular part diagonally towards the rear, as shown by arrow B2 in Figure 2A, thereby promoting good airflow around the tire. This also reduces the air resistance of the tire.

[0069] Figure 9 is a cross-sectional view showing a tire molding die of an embodiment. Figure 10 is a perspective view showing a portion of the tire molding die in an embodiment in which recesses 80 corresponding to a plurality of first protrusions 31 are formed. The pneumatic tire of this embodiment is formed by a tire molding die 70. Hereinafter, the tire molding die 70 will be referred to as the die 70. The die 70 is a die for molding the tire 1 shown in Figures 1 to 8 above. With the die 70, it is possible to produce a superior shine on the tire side surface 13 by utilizing light reflection, thereby realizing a highly aesthetically pleasing tire. Furthermore, with the die 70, it is possible to improve the aesthetic appeal by making the radial irregularities that occur on the tire side surface 13 when the tire 1 is inflated less noticeable, and to reduce the air resistance of the tire 1.

[0070] In the following, each component will be described according to the tire axial direction X and tire radial direction Y of the tire 1 described above, which is formed by the mold 70.

[0071] The mold 70 includes a tread mold 71 for forming the surface of the tire tread 1 and a pair of side molds 72 for forming the surface of the sidewall.

[0072] The tread mold 71 has a main body 74 having a tread molding surface 73, and a projection 75 protruding from the tread molding surface 73.

[0073] The main body 74 is made of a metal material, for example, an aluminum alloy. Suitable aluminum alloys include, for example, AC4 series and AC7 series. The projection 75 is the part that forms the circumferential groove in the tire 1. The projection 75 is made of the same material as the metal material that constitutes the main body 74.

[0074] The side mold 72 has a main body 76 having side molding surfaces 77a and 77b, and the side molding surface 77a, which forms the tire side surface on the outside of the vehicle, has a plurality of protrusions 78 that project outward from the side molding surface 77a. The main body 76 is made of the same metal material as the main body 74. The plurality of protrusions 78 are parts that form a plurality of grooves 109 on the tire 1, with a plurality of protrusions rising from the bottom surface 110.

[0075] The tread mold 71 is a fan shape in plan view, formed by dividing an annular body into multiple sections in the circumferential direction. The multiple sections of the tread mold 71 form a continuous annular body with an inner diameter corresponding to the outer diameter of the tire 1 to be molded, when the mold is clamped as described later. The upper side mold 72 is annular and is fixed to the lower surface of an upper plate (not shown) that constitutes the vulcanizing molding machine, and moves up and down in conjunction with the movement of the first lifting member (not shown). The lower side mold 72 is annular and is fixed to the floor surface and is fixed to the lower surface of a lower plate (not shown) that constitutes the vulcanizing molding machine. The vulcanizing molding machine moves multiple segments (not shown), one for each tread mold 71, on the outside of the multiple sections of the tread mold 71 using the first lifting member. Simultaneously with the movement of the first lifting member, the vulcanizing molding machine slides the inclined outer surfaces of the multiple segments vertically on an inclined cylindrical surface provided at the lower end of a second lifting member (not shown) that moves up and down independently of the first lifting member. As a result, the vulcanizing molding machine reciprocates multiple segments radially with respect to the central axis of the annularly continuous tread mold 71. This allows the vulcanizing molding machine to switch the mold 70 between a clamped state and an open state.

[0076] In the mold 70 configured in this way, a green tire is placed on the lower tread mold 71 so that the tire axis is aligned vertically when the mold is open. An inflatable bladder is then placed inside the green tire, and the bladder is inflated by supplying air to it. With the inner surface of the green tire held by the outer surface of the bladder, the first and second lifting members are raised and lowered to clamp the mold 70. The rubber of the green tire adheres to the tread molding surface 73 and the side molding surfaces 77a and 77b due to the pressure from the mold 70, and a heat exchange medium adjusted to a predetermined temperature is constantly flowed between the member that fixes the upper plate and the member that fixes the lower plate. As a result, the rubber of the green tire is vulcanized, and a tire 1 of a predetermined shape is completed.

[0077] In this embodiment, a plurality of protrusions 78 are formed on the side molding surface 77a for forming the tire side surface 13 on the outside of the vehicle, for forming a groove 109 in which a plurality of first protrusions forming a plurality of triangular sections are raised. The top surface of the protrusion 78 corresponds to the bottom surface 110 of the groove 109.

[0078] As shown in Figure 10, the top surface 78a of the projection 78 has multiple recesses 80 that correspond to multiple protrusions provided on the tire side surface 13. The recesses 80 are recessed in a roughly V-shape from the top surface 78a and have a shape that corresponds to the six-faced projection. Specifically, the groove 109 has two quadrilateral first surfaces 83 that are continuous in a V-shape when viewed in a direction perpendicular to the top surface 78a, two quadrilateral second surfaces 84 connected to each first surface 83 by the valley lines of the valleys, and two triangular third surfaces 85 provided at both ends in the longitudinal direction of the recess 80. The first surfaces 83, second surfaces 84, and third surfaces 85 of the recess 80 form the first surface 33, second surface 34, and third surface 35 of the projection of the tire 1, respectively.

[0079] Multiple recesses 80 in the mold can be formed by drilling holes in the top surface 78a of the protrusions 78 of the mold. For example, as the hole drilling, NC machining using a cutting tool such as an end mill, laser machining, or electrical discharge machining can be used.

[0080] Figure 11 is a cross-sectional view showing a plurality of first protrusions 31, 31a formed to protrude from different surfaces of the tire side surface 13a in a tire of another embodiment. In this example, the tire side surface 13a has a plurality of first protrusions 31 protruding from the bottom surface 110 of the groove 109 and a plurality of first protrusions 31a protruding from the sidewall reference surface 14 outside the groove 109. The shape of each of the plurality of first protrusions 31, 31a is the same as the first protrusions 31 formed on the tire 1 shown in Figures 1 to 8. In this example, the reflection of light from the reflective surface of the first protrusions 31a on the sidewall reference surface 14 becomes more noticeable. Therefore, it is easier to give the tire side surface 13a more contrast. In this case, the height of the first protrusions 31a on the sidewall reference surface 14 is greater than the height of the first protrusions 31 protruding from the bottom surface 110 of the groove 109. Therefore, from the perspective of suppressing an increase in air resistance, it is preferable to have the first projection 31 protrude from the bottom surface 110 of the groove 109, as shown in the configurations of Figures 1 to 8. In this example, the first projection 31 in the groove 109 may be omitted, and a configuration in which only a plurality of first projections 31c on the sidewall reference surface 14 are formed on the tire side surface 13 is also possible. In this example, the other configurations and functions are the same as those in Figures 1 to 10.

[0081] Although not shown in the figures, as an alternative embodiment, the first, second, and third protrusions forming each triangular section, inner pattern section, outer edge pattern section, etc., are not limited to a hexahedral shape having two first faces 33, two second faces 34, and two third faces 35, as shown in Figures 5A to 8 for the first protrusion 31, but can adopt various shapes of protrusions. For example, some or all of the first, second, and third protrusions may have a tetrahedral shape with one first face and one second face having different inclination angles when rising from the bottom surface of the groove, and two second faces at both ends. Also, the multiple first protrusions that constitute each of the two or three sides of each triangular section may be multiple serrated protrusions, cylindrical protrusions, etc. Furthermore, each of the two or three sides constituting the first triangular section 103a, which has one apex facing outward in the tire radial direction, and whose tip is located radially outward from the tire axial outer end that defines the maximum tire width, may be composed of a single projection extending in the side direction. In this case, the apex of each projection may be a flat surface facing in the tire axial direction.

[0082] Furthermore, although the above description explains that each decorative part 100, 101 includes five triangular parts, including the first triangular part 103a, the second triangular part 103b, and the third triangular part 103c, the decorative part only needs to include three or more triangular parts, and may have only three, only four, or six or more triangular parts. In addition, the three or more triangular parts provided in the decorative part may all have the same shape or the same size.

[0083] Furthermore, although the above embodiment described a case in which decorative parts 100 and 101 are provided on the tire side surface 13 facing both the outside and inside of the vehicle, the decorative parts 100 and 101 may be provided only on the tire side surface facing either the outside or inside of the vehicle, for example, only on the tire side surface facing the outside of the vehicle. In this case, the configuration may specify the mounting direction of the tire.

[0084] This disclosure is further illustrated by the following embodiments. Configuration 1: On the tire side surface, which is the outer surface in the tire axial direction, located radially inward from the tread contact edge and radially outward from the rim line, an arc-shaped decorative portion is formed in the circumferential direction of the tire. The decorative part is provided with three or more triangular sections. Each of the two sides of each of the aforementioned triangular sections has a width of 1.2 mm or more. Each of the aforementioned triangular portions has a single apex facing outward in the radial direction of the tire, and the tip of the apex is positioned radially outward from the outer end in the axial direction of the tire that defines the maximum width of the tire. Pneumatic tires. Configuration 2: Each of the two sides of each of the aforementioned triangular sections is composed of a plurality of first projections. The pneumatic tire described in Component 1. Configuration 3 The three or more triangular sections are not arranged adjacent to each other in the circumferential direction of the tire. The pneumatic tire described in Component 1. Configuration 4: At least one side of the triangular portion is located at the inner end of the triangular portion in the tire radial direction, has a flat portion facing the tire axial direction at the outer end in the tire axial direction, and is formed by a part of a protruding portion having an edge at the outer end of the flat portion in the tire radial direction. A pneumatic tire as described in any one of configurations 1 through 3. Configuration 5: The aforementioned protruding portion has a trapezoidal or rectangular cross-section. The pneumatic tire described in component 4. Configuration 6: An inner pattern portion, composed of a plurality of second protrusions, is formed on the inside of at least one of the three sides of the triangular portion. A pneumatic tire as described in any one of the components 1 through 5. Composition 7: A smooth surface is disposed between at least one of the triangular portions and the inner pattern portion formed inside the triangular portion. The pneumatic tire described in component 6. Composition 8: An outer edge pattern portion extending in the tire circumferential direction is formed at the outermost end of the decorative portion in the tire radial direction. A pneumatic tire as described in any one of the components 1 through 7. Composition 9: The outer end pattern portion is composed of a plurality of third protrusions. The pneumatic tire described in component 8. Configuration 10: The radial height of each of the three or more triangular sections is 40% or more of the radial height of the decorative section. A pneumatic tire as described in any one of the components 1 through 9. Composition 11: The three or more triangular sections mentioned above do not overlap when viewed in the radial direction of the tire, and the circumferential length of each of them is 10 mm or more. A pneumatic tire as described in any one of configurations 1 through 10. Composition 12: The ratio of the tire circumferential length of the decorative portion to the total tire circumferential length of the tire side surface at the same position as the tire radial position of the decorative portion is 25% or more and 45% or less. A pneumatic tire as described in any one of configurations 1 through 11. Composition 13: A mold for forming a pneumatic tire, which is used to form a pneumatic tire as described in any one of configurations 1 to 12, A mold for molding pneumatic tires, having a plurality of recesses on the molding surface corresponding to the plurality of first protrusions. [Explanation of symbols]

[0085] 1 pneumatic tire (tire), 10 tread, 12 sidewall, 13, 13a, 13b tire side surface, 14 sidewall reference surface, 18 rim strip, 19 rim protector, 20 rim line, 31, 31a first projection, 33 first surface, 34 second surface, 35 third surface, 36 ridge line, 40 wake region, 70 mold for tire molding, 71 tread mold, 72 side mold, 73 tread molding surface, 74 main body, 75 projection, 76 main body, 77a, 77b side molding surface, 78 protrusion, 78a top surface, 80 recess, 100, 101 decorative part, 102 annular part, 103a first triangular part, 103b second triangular part, 103c third triangular part, 103d Straight section, 104a, 104b, 104c, 104d Straight section, 105a, 105b Arc-shaped section, 106a, 106b, 106c, 106d L-shaped section, 107a, 107b Concave section, 108 Diamond section, 109 Concave groove, 110 Bottom surface, 111, 111a Projection, 112 Plane, 113,114,115,116,117,118 Pattern area, 119 Side, 120 Mark, 122a, 122b, 122c Chevron, 124 Straight, 126 Smooth, 128 Inner triangular, 129 Smooth, T ground edge.

Claims

1. On the tire side surface, which is the outer surface in the tire axial direction, located radially inward from the tread contact edge and radially outward from the rim line, an arc-shaped decorative portion is formed in the circumferential direction of the tire. The decorative part is provided with three or more triangular sections. Each of the two sides of each of the aforementioned triangular sections has a width of 1.2 mm or more. Each of the aforementioned triangular portions has a single apex facing outward in the radial direction of the tire, and the tip of the apex is positioned radially outward from the outer end in the axial direction of the tire that defines the maximum width of the tire. Pneumatic tires.

2. Each of the two sides of the aforementioned triangular section is formed by a plurality of first protrusions. The pneumatic tire according to claim 1.

3. The three or more triangular sections are not arranged adjacent to each other in the circumferential direction of the tire. The pneumatic tire according to claim 1.

4. At least one side of the triangular portion is located at the inner end of the triangular portion in the tire radial direction, has a flat portion facing the tire axial direction at the outer end in the tire axial direction, and is formed by a part of a protruding portion having an edge at the outer end of the flat portion in the tire radial direction. The pneumatic tire according to claim 1.

5. The aforementioned protruding portion has a trapezoidal or rectangular cross-section. The pneumatic tire according to claim 4.

6. An inner pattern portion, composed of a plurality of second protrusions, is formed on the inside of at least one of the three sides of the triangular portion. The pneumatic tire according to claim 1.

7. A smooth surface is disposed between at least one of the triangular portions and the inner pattern portion formed inside the triangular portion. The pneumatic tire according to claim 6.

8. An outer edge pattern portion extending in the tire circumferential direction is formed at the outermost end of the decorative portion in the tire radial direction. The pneumatic tire according to claim 1.

9. The outer end pattern portion is composed of a plurality of third protrusions. The pneumatic tire according to claim 8.

10. The radial height of each of the three or more triangular sections is 40% or more of the radial height of the decorative section. The pneumatic tire according to claim 1.

11. The three or more triangular sections mentioned above do not overlap when viewed in the radial direction of the tire, and the circumferential length of each of them is 10 mm or more. The pneumatic tire according to claim 1.

12. The ratio of the tire circumferential length of the decorative portion to the total tire circumferential length of the tire side surface at the same position as the tire radial position of the decorative portion is 25% or more and 45% or less. The pneumatic tire according to claim 1.

13. A mold for forming a pneumatic tire according to any one of claims 1 to 12, A mold for molding pneumatic tires, having a plurality of recesses on the molding surface corresponding to the plurality of first protrusions.

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