JP6672851B2 - Pneumatic tire - Google Patents

Description

  The present invention relates to a pneumatic tire having a decoration on a tire side portion, and more particularly, to a pneumatic tire capable of increasing the visibility of the decoration and making the damage less noticeable.

  2. Description of the Related Art In order to display a manufacturer name, a brand name, and the like, decoration such as a mark including characters, figures, symbols, and the like is generally performed on an outer surface of a sidewall portion of a pneumatic tire. Such a decoration is formed, for example, as a convex portion protruding from the base surface of the outer surface of the sidewall portion or a concave portion recessed with respect to the base surface. In this case, since the decoration (a mark or the like) and the outer surface of the surrounding sidewall portion are basically the same color (black), there is a problem that it is difficult to obtain sufficient visibility only with such irregularities. Was.

  On the other hand, in Patent Document 1, for example, a border is provided around the mark, protruding from the outer surface of the sidewall portion, and a mesh pattern is formed in a region surrounded by the border (inside the mark). Propose to form. However, since the mesh pattern is a simple pattern composed of a large number of intersecting narrow grooves, the mesh pattern itself does not have sufficient visibility. In this proposal, it was assumed that the border was composed of white rubber. Further, since the mesh pattern is merely a collection of a large number of narrow grooves, there has been a problem that, when the sidewall portion comes into contact with a curb or the like during traveling and a traumatic injury occurs, the traumatic injury is conspicuous. When using white rubber as in the above, the white rubber layer embedded in the sidewall portion is shaved by exposing the black rubber of the surface layer to be exposed, so that a border made of white rubber is formed. It is also feared that the surface layer is shaved even in a portion intended to be white, thereby exposing the white rubber).

  Patent Document 2 proposes that a grid pattern including a large number of rectangular elements and frame elements is provided in a tire sidewall portion, and a mark is arranged in the grid pattern. However, since the lattice pattern in this proposal has a simple structure of repeating squares bordered by frame elements, the pattern itself does not have sufficient visibility, and in the case of trauma as described above, Since the regular repetition of the square is impaired, there is a problem that the trauma is conspicuous.

Japanese Patent No. 3072721 JP 2013-233854 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a pneumatic tire capable of improving the visibility of the decoration when decorating the tire side portion and making the damage less noticeable.

  The pneumatic tire of the present invention for achieving the above object is a pneumatic tire having a decorative portion on a tire side portion, the decorative portion having a lattice pattern, and the lattice pattern is triangular in plan view. Having a structure in which the convex portions and the concave portions are alternately arranged, including a plurality of convex portions having a basic tone and a plurality of concave portions having a triangular basic tone in a plan view, and a pair of adjacent convex portions and concave portions. A protrusion protruding from the convex portion to the concave portion at the boundary portion and a concave portion protruding from the concave portion to the convex portion, and the protruding portion and the concave portion have a point-symmetric relationship in plan view. I do.

  The present invention has a structure in which these convex portions and concave portions are alternately arranged including a plurality of convex portions having a triangular tone in plan view and a plurality of concave portions having a triangular tone in plan view. At the boundary between the pair of convex portions and concave portions that match each other, there is a protrusion protruding from the concave portion to the convex portion, and a concave portion protruding from the concave portion to the convex portion, and these convex portions and the concave portion are point-symmetric in plan view. Since a decorative part having a lattice-like pattern having a complicated structure that is related to each other is adopted, each structural unit of the lattice-like pattern (adjacent to the neighboring part) differs depending on the difference in light hit between the concave part and the concave part and the convex part and the protruding part. Brightness and darkness occur in the pair of the convex portion and the concave portion that match, and by repeating this, the color tone of the entire decorative portion rises as compared with the surroundings, and the visibility of the decorative portion can be improved. At this time, since the above-mentioned projection and depression are provided, the shape of the projection and the depression in a plan view (that is, the shape of the minimum unit in which a difference in light and dark is caused by a difference in how light hits) is complicated. Therefore, a lattice-like pattern can be impressed more than a simple repetition of triangular irregularities, and visibility can be effectively improved. In addition, fine irregularities based on a triangle in a plan view are repeated, and furthermore, the above-mentioned projections and depressions are provided, and the boundaries between the depressions and projections are intricate, so that the tire side portion during traveling is Even if trauma occurs, the trauma can be made inconspicuous.

  In the present invention, the maximum protruding length of the protruding portion toward the concave portion is 0.1 to 0.2 times the length of the side having the protruding portion at the boundary portion, and the protruding portion side of the concave portion is Is preferably 0.1 to 0.2 times the length of the side having the concave portion of the concave portion at the boundary portion. By setting the protruding length of the protruding portion and the concave portion to an appropriate size with respect to the side of the protruding portion or the concave portion, the shape of each structural unit of the lattice pattern can be optimized, This is advantageous for enhancing the performance.

  In the present invention, the width at the boundary of the protrusion is 0.1 to 0.25 times the length of the side having the protrusion at the boundary, and the width at the boundary of the depression is equal to the width of the boundary. Is preferably 0.1 to 0.25 times the length of the side having the concave portion of the concave portion. By setting the width of the protruding portion and the recessed portion to an appropriate size with respect to the side of the protruding portion or the recessed portion, the shape of each structural unit of the lattice pattern can be optimized, and visibility can be improved. It is advantageous to increase.

  In the present invention, the projection and the depression having a point-symmetric relationship in a plan view are in contact with each other at a point of symmetry, and the point of symmetry is a distance between a middle point of the side having the projection and the depression and a length of the side. It is preferable to be located within a range of 0.15 times the height. By arranging the protrusions and the depressions in this manner, the shape of each structural unit of the lattice pattern can be made favorable, which is advantageous for enhancing visibility.

  In the present invention, it is preferable that the specification is provided with a corner having a point at which a point where the protruding portion and the recessed portion most protrude toward the concave portion side or the convex portion side is a vertex. By adopting such a specification, since the boundary between the convex portion and the concave portion is a combination of straight lines, it is advantageous to make the wound, which is generally linear, less likely to be inconspicuous in the lattice pattern. become.

  In the present invention, the height difference between the bottom surface of the concave portion and the top surface of the convex portion is preferably 0.5 mm to 2.0 mm. This makes it possible to improve the degree of difference between lightness and darkness of the convex portion and the concave portion due to the difference in how light hits, which is advantageous for enhancing visibility.

  In the present invention, it is preferable to provide a ridge on the bottom surface of the concave portion. By providing the ridge in this manner, the concave portion can be made to look darker than the convex portion, which is advantageous for improving visibility.

  According to the present invention, the decorative portion includes a mark bordered by a ridge protruding from the surface of the tire side portion, and the area within the mark surrounded by the ridge is formed of a flat surface having no lattice pattern. It can be a specification that is. Alternatively, in the present invention, the decorative portion may constitute a mark, and a specification may be provided in which a ridge protruding from the surface of the tire side portion to border the mark is provided on the periphery of the mark.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective sectional view which shows the principal part of the pneumatic tire which consists of embodiment of this invention. It is a perspective sectional view showing the important section of the pneumatic tire which consists of another embodiment of the present invention. It is a front view which shows an example of the lattice-like pattern which comprises the decoration part of this invention. It is a perspective view which shows an example of the lattice-like pattern which comprises the decoration part of this invention. It is a front view which shows another example of the lattice-like pattern which comprises the decoration part of this invention. It is a perspective view which shows another example of the lattice-like pattern which comprises the decoration part of this invention. It is a perspective view which shows another example of the lattice-like pattern which comprises the decoration part of this invention. It is a perspective view which shows another example of the lattice-like pattern which comprises the decoration part of this invention.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the pneumatic tire of the present embodiment includes a ring-shaped tread portion 1 extending in the tire circumferential direction and a pair of sidewall portions 2 arranged on both sides of the tread portion 1. And a pair of bead portions 3 arranged inside the sidewall portion 2 in the tire radial direction.

  A single carcass layer 4 is mounted between the pair of left and right bead portions 3. The end of the carcass layer 4 is folded from the inside of the tire to the outside around the bead core 5 arranged in each bead portion 3. A bead filler 6 made of rubber and having a triangular cross section is arranged on the outer peripheral side of the bead core 5. On the outer peripheral side of the carcass layer 4 in the tread portion 1, a plurality of (two in the illustrated example) belt layers 7 are arranged all around the tire. These belt layers 7 include reinforcing cords made of, for example, steel cords, and the reinforcing cords are inclined at an angle of, for example, 10 ° to 40 ° with respect to the tire circumferential direction, and the reinforcing cords are arranged such that the reinforcing cords cross each other between layers. Have been. Further, a belt reinforcing layer 8 is provided on the outer peripheral side of the belt layer 7. The belt reinforcing layer 8 includes an organic fiber cord oriented in the tire circumferential direction. In the belt reinforcing layer 8, the angle of the organic fiber cord with respect to the tire circumferential direction is set to, for example, 0 ° to 5 °.

  The present invention is applied to such a general pneumatic tire, but the specific structure is not limited to the basic structure described above.

  In the present invention, in such a pneumatic tire, as shown in FIGS. 1 and 2, a decoration having a lattice pattern 10 </ b> A described later on a part of the sidewall portion 2 (the position of the hatched portion in FIGS. 1 and 2). A part 10 is formed. The decoration section 10 is for displaying a mark S composed of characters, graphics, symbols, and the like, which is intended to display, for example, a manufacturer name, a brand name, and the like. In the embodiment of FIG. 1, the mark S without the lattice pattern 10 </ b> A is arranged in the decorative portion 10, and in the embodiment of FIG. 2, the mark S is formed by the decorative portion 10 itself constituting the mark S. Is distinguished from the surroundings and is visually recognized. In the examples of FIGS. 1 and 2, the detailed shape of the decorative portion 10 is omitted and the decorative portion 10 is indicated by oblique lines in order to explain the relationship between the decorative portion 10 and the mark S.

  In both cases of FIGS. 1 and 2, the decorative portion 10 includes a lattice pattern 10A as shown in FIGS. The lattice pattern 10A includes a plurality of convex portions 11 having a triangular tone in plan view and a plurality of concave portions 12 having a triangular tone in plan view, and these convex portions 11 and concave portions 12 are alternately arranged. It has the structure which was done. In particular, in the illustrated example, both the convex portion 11 and the concave portion 12 are based on a right-angled isosceles triangle, and are arranged such that long sides thereof are in contact with each other. Further, at the boundary between a pair of adjacent convex portions 11 and concave portions 12, a protruding portion 11a protruding from the convex portion 11 to the concave portion 12 and a concave portion 12a protruding from the concave portion 12 to the convex portion 11 are formed. The projection 11a and the recess 12a have a point-symmetrical relationship in plan view. In particular, in the illustrated example, when the pair of the convex portion 11 and the concave portion 12 adjacent to each other with the long side as the boundary is regarded as a structural unit of a lattice pattern, the aforementioned protruding portion 11a and the concave portion are formed at the boundary between the adjacent structural units. The protruding portion 11a and the recess 12a are not provided on the boundary (the long side corresponding to the diagonal line of the structural unit) included in the structural unit.

  Since the decorative part 10 provided with the lattice-shaped pattern 10A having such a complicated structure is employed, the lattice-shaped pattern is formed by the difference in light hit between the concave part 12 and the concave part 12a and the convex part 11 and the protruding part 11a. Brightness and darkness occur in each of the constituent units of 10A (the pair of the adjacent convex portions 11 and concave portions 12), and the repetition causes the color tone of the entire decorative portion 10 to be raised as compared with the surroundings, thereby making the decorative portion 10 clear from other portions. Can be distinguished. Therefore, when the mark S is provided in the decorative part 10 as shown in FIG. 1, the mark S in the decorative part 10 can be made to stand out and its visibility can be increased, and as shown in FIG. Even when the portion 10 itself forms the mark S, the visibility of the mark S (the decorative portion 10) can be enhanced by making the mark S (the decorative portion 10) stand out from the surroundings. At this time, since the protruding portion 11a and the recessed portion 12a are provided, the plan view shapes of the convex portion 11 and the concave portion 12 (that is, the shape of the minimum unit in which a difference in light and dark occurs due to a difference in how light hits). Is complicated, the impression of the lattice pattern 10A can be made more impressive than the repetition of simple triangular irregularities, and the visibility can be effectively improved. In addition, fine irregularities based on a triangle in a plan view are repeated, and furthermore, the aforementioned protruding portion 11a and concave portion 12a are provided, and the boundary line between the convex portion 11 and the concave portion 12 is intricate. Even if a trauma occurs in the tire side portion, the trauma can be confused in the boundary line, and the trauma can be made inconspicuous.

  At this time, the length of one side of each structural unit (a pair of adjacent convex portions 11 and concave portions 12) of the lattice pattern 10A is the minimum length included in the mark S group (when the mark S is a character, a character string). May be 0.1 to 0.2 times the length of the short side of the rectangle circumscribing the component (the smallest character). That is, for example, if a character such as an alphabet is adopted as the mark S, the size of the character itself is different between the uppercase and lowercase letters even if the font size is the same. By setting the length of one side of each structural unit of the lattice pattern 10A based on the smallest constituent element (smallest character) included in the mark S, all the constituent elements included in the mark S group (character string) are set. It is possible to exhibit the effect of improving the visibility of the (character) by the lattice pattern 10A.

  The protruding portion 11a and the recessed portion 12a are not particularly limited in shape in plan view as long as they have a point-symmetric relationship in plan view as described above. In addition to the semicircular shapes shown in FIGS. , 6, the protrusion 11 a and the recess 12 a may be provided with a corner having a vertex at a point where the protrusion protrudes most toward the recess 12 or the protrusion 11. In particular, in the examples of FIGS. 5 and 6, the protruding portion 11a and the concave portion 12a each have a substantially triangular shape. With such specifications, when the boundary between the convex portion 11 and the protruding portion 11a and the concave portion 12 and the concave portion 12a is a combination of straight lines, most of the damage to the sidewall portion 2 during traveling is linear. Even if a trauma occurs, the trauma can be scattered in the lattice-shaped pattern 10A formed by the linear boundaries, and the trauma can be effectively made inconspicuous.

  In any of FIGS. 3 to 6, the maximum protrusion length L1 of the protrusion 11 a toward the recess 10 is 0.1 times to 0 times the length A of the side of the protrusion 11 having the protrusion 11 a at the boundary. It is preferable that the maximum length L2 of the recess 12a protruding toward the protrusion 11 is 0.1 times to 0.1 times the length A of the side of the recess 12 having the recess 12a at the boundary. Preferably it is twice. By setting the protruding lengths L1 and L2 of the protruding portion 11a and the recessed portion 12a to an appropriate size with respect to the length A of the side of the protruding portion 11 or the concave portion 12, each configuration of the lattice-shaped pattern 10A is achieved. The shape of the unit can be optimized, which is advantageous for improving visibility. At this time, if the maximum protrusion lengths L1 and L2 are smaller than 0.1 times the length A of the corresponding side, the protrusion 11a and the recess 12a are too small, so that the protrusion 11a and the recess 12a are provided. The effect of visibility and trauma is not sufficiently obtained. When the maximum protruding lengths L1 and L2 are larger than 0.2 times the length A of the corresponding side, the proportion of the dent 12a occupying the projection 11 or the proportion of the projection 11a occupying the recess 12 increases. It becomes too complicated, and the shape of each structural unit of the lattice pattern 10A becomes too complicated, so that it is difficult to change the color tone by effectively changing the way of hitting light, and it is difficult to sufficiently enhance the visibility. In addition, since the convex portion 11 has a greatly hollowed shape due to the concave portion 12a, it is particularly difficult to maintain the durability of the convex portion 11.

  Also, the width W1 at the boundary of the protrusion 11 is preferably 0.1 to 0.25 times the length A of the side of the protrusion 11 having the protrusion 11a at the boundary, and the width W1 of the recess 12a is preferably It is preferable that the width W2 at the boundary is 0.1 to 0.25 times the length A of the side having the recess 12a of the recess 12 at the boundary. By setting the widths W1 and W2 of the protruding portion 11a and the recessed portion 12a to an appropriate size with respect to the length A of the corresponding side, the shape of each structural unit of the lattice pattern 10A is optimized. This is advantageous for improving visibility. At this time, if the widths W1 and W2 are smaller than 0.1 times the length A of the corresponding side, the projections 11a and the depressions 12a are too small, so that the visibility by providing the projections 11a and the depressions 12a is improved. And the effect on trauma cannot be obtained sufficiently. If the widths W1 and W2 are larger than 0.25 times the length A of the corresponding side, the straight portions on both sides of the protrusion 11a and the recess 12a in the side where the protrusion 11a and the recess 12a are provided are sufficiently secured. However, this side is substantially in a zigzag shape or a wavy shape in which the protruding portions 11a and the recessed portions 12a are alternately arranged, and deviates from the originally intended shape of the lattice-shaped pattern 10A. It becomes difficult to improve the character.

  It is preferable that the protruding portion 11a and the dent portion 12a are arranged near the center among the boundary portions. In particular, as shown in the drawing, the projection 11a and the depression 12a, which are in point symmetry in plan view, are in contact with each other at the symmetry point P, and this symmetry point P is the side having the projection 11a and the depression 12a. Is preferably located within a range of 0.15 times the length A of this side from the midpoint of. In other words, the distance d from the midpoint of the side having the protrusion 11a and the recess 12a to the symmetry point P of the protrusion 11a and the recess 12a provided on the side is 0. It is preferably within 15 times. By arranging the protruding portion 11a and the concave portion 12a in this manner, the shape of each structural unit of the lattice pattern 10A can be made favorable, which is advantageous for improving visibility. In particular, by adopting such an arrangement, it is preferable that a linear portion where the projection 11a and the depression 12a are not formed is present at the end of the side having the projection 11a and / or the depression 12a. Is preferably at least 0.25 times the length A of this side.

  The convex portion 11 and the concave portion 12 that constitute the lattice pattern 10A are provided with a bottom surface of the concave portion 12 and the convex portion 11 in order to improve the degree of difference in brightness between the convex portion 11 and the concave portion 12 due to a difference in light exposure. The height difference H1 with respect to the top surface is preferably 0.5 mm to 2.0 mm. At this time, if the height difference H1 is smaller than 0.5 mm, there is almost no height difference between the convex portion 11 and the concave portion 12, so that there is no large difference in how the light hits. Since the difference in brightness is not sufficiently generated, it is difficult to enhance the visibility by the lattice pattern 10A. If the height difference H1 is larger than 2.0 mm, the rubber gauge of the sidewall portion 2 becomes too thick at the convex portion 11 or too thin at the concave portion 12, which may adversely affect the original performance of the tire. .

  When forming the protrusions 11 and the recesses 12 in the sidewall portion 2, the recesses 12 may be formed by recessing the bottom surface of the recesses 12 with respect to the base surface of the sidewall portion 2. It is preferable that the base surface of the sidewall portion 2 and the bottom surface of the concave portion 12 have the same height because there is a concern that the rubber gauge of the second 2 becomes thin. Further, the entire decorative portion 10 may be raised from the base surface of the sidewall portion 2 so that the bottom surface of the concave portion 12 protrudes from the base surface of the sidewall portion 2. Since there is a concern that the rubber gauge of the portion where the second decorative portion 10 is provided becomes thick, it is preferable from this viewpoint that the base surface of the sidewall portion 2 and the bottom surface of the concave portion 12 have the same height.

  In the present invention, the mark S is formed in the decorative portion 10 as described above (as shown in FIG. 1), or the decorative portion 10 itself forms the mark S (as shown in FIG. 2). In any case, it is preferable that the mark S is bordered by a ridge 13 projecting from the surface of the sidewall portion 2. Specifically, in the case of the embodiment of FIG. 1, the decorative portion 10 includes a mark S bordered by a ridge 13 protruding from the surface of the sidewall portion 2, and the inside of the mark S surrounded by the ridge 13 is provided. Region may be configured as a flat surface having no lattice pattern 10A. Alternatively, in the case of the embodiment of FIG. 2, in forming the mark S with the decorative portion 10, a ridge 13 that protrudes from the surface of the sidewall portion 2 and borders the mark S is provided around the periphery of the mark S. Good to do. By bordering the mark S with the ridges 13 in this manner, the boundary between the portion having the lattice pattern 10A and the portion not having the lattice pattern 10A becomes clear, which is advantageous for improving visibility. . At this time, in any case, the height of the ridge 13 constituting the rim is preferably higher than the height of the protrusion 11, and the protrusion height H3 from the bottom surface of the recess 12 is, for example, 0.3 mm to 2.0 mm. Good.

  In the case of the embodiment of FIG. 1, the decorative portion 10 in FIGS. 3 to 6 is outside the mark S, and the left portion of the ridge 13 in FIGS. 3 to 6 is a flat surface in the mark S. Conversely, in the case of the embodiment of FIG. 2, the decorative portion 10 in FIGS. 3 to 6 is the mark S itself (the inside of the ridge 13 bordering the mark S), and the left side of the ridge 13 in FIGS. Is a base surface of the sidewall portion 2 around the mark S.

  In the present invention, the visibility can be sufficiently enhanced by the lattice pattern 10A described above, but a ridge 14 may be provided on the bottom surface of the concave portion 12 as shown in FIGS. By providing the ridge 14 in this manner, the concave portion 12 can be made to look darker than the convex portion 11, and the difference in brightness between the convex portion 11 and the concave portion 12 due to the difference in how light hits becomes clear, and This is advantageous for enhancing the performance.

  In a pneumatic tire having a tire size of 205 / 65R16, as shown in FIG. 1, a decorative portion having a lattice pattern composed of a combination of a convex portion and a concave portion is provided on a sidewall portion, and no lattice pattern is provided in the decorative portion. The mark is arranged, and the basic shape of the convex portion and the concave portion constituting the lattice pattern, the height difference H1 between the convex portion and the concave portion, the convex portion to the concave portion at the boundary between the pair of adjacent convex portions and the concave portion. The presence or absence of the protruding portion, the shape of the protruding portion, the maximum protruding length L1, the width W1, the presence or absence of the recessed portion protruding from the concave portion to the convex portion at the boundary between a pair of adjacent convex portions and the concave portion, the concave portion , The maximum protrusion length L2, the width W2, the distance d from the midpoint of the side where the protrusion and the depression are formed to the point of symmetry between the protrusion and the depression, and the presence or absence of a protrusion that borders the mark ( With or without edging) Tsu Comparative Example having different as described presence of di in Tables 1 to 2 were produced 14 kinds of tires of Examples 1-12.

  Further, in a pneumatic tire having a tire size of 205 / 65R16, as shown in FIG. 2, a mark composed of a decorative portion having a lattice-like pattern composed of a combination of a convex portion and a concave portion is provided on a sidewall portion, and a lattice-like mark is provided. The basic shape of the convex portion and the concave portion constituting the pattern, the height difference H1 between the convex portion and the concave portion, the presence or absence of a projecting portion projecting from the convex portion to the concave portion at the boundary between a pair of adjacent convex portions and the concave portion, The shape of the protruding portion, the maximum protruding length L1, the width W1, the presence or absence of a concave portion protruding from the concave portion to the convex portion at the boundary between the pair of adjacent convex portions and the concave portion, the shape of this concave portion, the maximum protruding length L2 , The width W2, the distance d from the midpoint of the side where the protrusion and the recess are formed to the point of symmetry between the protrusion and the recess, the presence or absence of a ridge that borders the mark (the presence or absence of framing), The presence or absence of ridge Comparative Example 3-4 having different as described, were fabricated 14 different tires of Examples 13-24.

  Comparative Examples 1 and 3 are examples in which a lattice-like pattern is configured by alternately arranging rectangular concave portions and convex portions. Comparative Examples 2 and 4 are examples in which a grid-like pattern is formed by alternately arranging rectangular concave portions and convex portions, and each has a structure in which the protruding portion and the concave portion are removed from Examples 1 and 13, respectively. It is an example. In Examples 1 to 24, the protruding portion and the depression formed at one boundary portion (side) were formed so as to be in contact with each other at the symmetry point as shown in FIGS.

  In Tables 1 and 2, when there are drawings corresponding to the shapes of the protruding portion and the concave portion, the drawing numbers are added in the tables. Each of the lengths L1 and L2, the widths W1 and W2, and the distance d indicates how many times the length of the side on which the target protrusion and / or depression is formed. In Examples 1 to 24, the length of this side coincides with the length of one side of each structural unit of the lattice pattern.

  These test tires were evaluated for visibility and inconspicuous damage by the following evaluation methods, and the results are shown in Tables 1 and 2.

Visibility The visibility of the design (mark) of each test tire was visually judged by 10 panelists according to the following criteria. The evaluation results were obtained by calculating the sum of the evaluation values based on the following criteria, and the results are shown in Table 1 as an index with Comparative Example 1 as 100, and in Table 2, as an index with Comparative Example 3 as 100. The greater the index value, the better the visibility.
[Criteria]
4: Each of the constituent units (characters) of the mark was clearly recognized.
3: Although some of the constituent units (characters) of the mark were unclear, the impression of the entire mark (entire character string) was clear.
2: It was difficult to distinguish the constituent units (characters) of the mark individually, but the whole mark (entire character string) could be recognized.
1: The whole mark had an unclear impression to the surroundings.

Inconspicuous Injury Injuries of the same size were applied to the decorative portion of each test tire, and the inconspicuousness of the injuries was evaluated by visual observation by 10 panelists according to the following criteria. The evaluation results were obtained by calculating the sum of the evaluation values based on the following criteria, and the results are shown in Table 1 as an index with Comparative Example 1 as 100, and in Table 2, as an index with Comparative Example 3 as 100. The larger the index value, the more difficult it is to detect a trauma, and the less the trauma is noticeable.
[Criteria]
3: No trauma could be recognized.
2: It was understood that there was an injury, but there was no impression that the appearance of the tire was greatly impaired by the injury.
1: The trauma was clearly recognized.

  As can be seen from Tables 1 and 2, the pneumatic tires of Examples 1 to 12 and Examples 13 to 24 have good visibility and inconspicuous trauma in comparison with Comparative Examples 1 and 3, respectively. Was completed. On the other hand, in Comparative Examples 2 and 4, even if the projections and depressions forming the lattice pattern are triangular, since the projections and depressions are not provided, the visibility cannot be sufficiently improved, and the trauma is not increased. Could not be improved. Although not shown in the table, when the shapes of the protrusions and depressions in Examples 3 to 12 are triangular as shown in FIG. 6, an increase in the index value of Example 2 with respect to the index value of Example 1 is shown. Minutes resulted in the addition to Examples 3-12. Similarly, in the case where the shapes of the protruding portions and the recessed portions in Examples 15 to 24 are triangular as shown in FIG. 6, the increase of the index value of Example 14 with respect to the index value of Example 13 is the same as that of Example 15. ~ 24.

DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 3 Bead part 4 Carcass layer 5 Bead core 6 Bead filler 7 Belt layer 8 Belt reinforcement layer 10 Decorative part 10A Lattice pattern 11 Convex part 11a Projection part 12 Concave part 12a Depression part 13 Ridge 14 Ridge S mark Chapter P Symmetry Point

Claims (9)

  A pneumatic tire having a decorative portion on a tire side portion, wherein the decorative portion has a lattice pattern, wherein the lattice pattern has a plurality of convex portions having a triangular tone in plan view and a triangular tone in plan view. A plurality of concave portions having a structure in which the convex portions and the concave portions are arranged alternately, and a protruding portion protruding from the convex portion to the concave portion at a boundary between a pair of adjacent convex portions and the concave portion. A pneumatic tire having a depression protruding from a recess to a projection, wherein the projection and the depression have a point-symmetric relationship in plan view.   The maximum protruding length of the protruding portion toward the concave portion is 0.1 to 0.2 times the length of the side of the protruding portion provided with the protruding portion at the boundary portion, and the protruding portion of the concave portion is The pneumatic pneumatic pump according to claim 1, wherein a maximum protruding length to a side is 0.1 to 0.2 times a length of the side of the concave portion provided with the concave portion at the boundary portion. tire.   The width of the protrusion at the boundary is 0.1 to 0.25 times the length of the side of the protrusion including the protrusion at the boundary, and the width of the depression at the boundary is 3. The pneumatic tire according to claim 1, wherein the length of a side of the concave portion provided with the concave portion at the boundary portion is 0.1 to 0.25 times. 4.   The projection and the depression having a point symmetrical relationship in a plan view are in contact at a point of symmetry, and the point of symmetry is from the midpoint of the side having the projection and the depression to the point of 0. The pneumatic tire according to any one of claims 1 to 3, wherein the pneumatic tire is located within a range of 15 times or less.   The pneumatic tire according to any one of claims 1 to 4, further comprising a corner having a point at which a point at which the protrusion and the depression protrude most toward the recess or the protrusion is a vertex.   The pneumatic tire according to any one of claims 1 to 5, wherein a height difference between a bottom surface of the concave portion and a top surface of the convex portion is 0.5 mm to 2.0 mm.   The pneumatic tire according to any one of claims 1 to 6, wherein a ridge is provided on a bottom surface of the concave portion.   In the decorative portion, a mark bordered by a ridge protruding from the surface of the tire side portion is provided, and an area in the mark surrounded by the ridge is a flat surface having no lattice pattern. The pneumatic tire according to any one of claims 1 to 7, wherein:   The said decoration part comprises a mark, The peripheral edge of this mark was provided with the ridge which protrudes from the surface of a tire side part, and borders the said mark, The Claims characterized by the above-mentioned. Pneumatic tires.

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