tire

Abstract

To provide a tire configured so that a width in which a decorative part appears on an outer surface of the tire can be widened.SOLUTION: A tire comprises a plurality of pattern large regions 18, arranged along a tire circumferential direction of a tire side part, which are formed of irregularities and are partitioned by clearances S which are smooth surfaces. The pattern large region 18 is constituted to include a first pattern region 20 and a second pattern region 22, arranged adjacent to the first pattern region 20, which is higher in brightness than the first pattern region 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a tire. [Background technology]

[0002] BACKGROUND ART A decoration in which minute projections and depressions are formed on the smooth surface of the side of a tire has been provided (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-099094 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a tire that can broaden the range of expression of decorative portions. [Means for solving the problem]

[0005] The tire described in claim 1 includes a plurality of pattern large regions arranged along the tire circumferential direction on the outer surface of the tire, each formed by concaves and convexes and partitioned by smooth surfaces, and the pattern large regions include a first pattern region and a second pattern region arranged adjacent to the first pattern region and having a higher brightness than the first pattern region, and the first pattern region and the second pattern region are spaced apart from each other across an axis of symmetry. Adjacent to each other and It is of symmetrical shape.

[0006] In the tire described in claim 1, the tire outer surface is decorated with a plurality of large pattern areas, each formed by projections and recesses, including a first pattern area and a second pattern area that is arranged adjacent to the first pattern area and has a higher brightness than the first pattern area, and which are partitioned by smooth surfaces, and this can widen the range of expression of the areas where the large pattern areas are provided, in other words, the decorative areas decorated on the tire outer surface.

[0007] A second aspect of the present invention is the tire according to the first aspect, wherein a plurality of the large pattern regions are arranged in the tire radial direction on the tire side portions.

[0008] In the tire described in claim 2, the large pattern area is provided on the side of the tire, which allows for a wider range of expression for the portion of the tire side where the large pattern area is provided, in other words, the decorative portion of the tire side. Furthermore, since multiple large pattern regions are arranged in the tire radial direction, the range of expression of the decorative portion can be increased compared to when multiple large pattern regions are not arranged in the tire radial direction.

[0009] The invention described in claim 3 is the tire described in claim 1 or claim 2, wherein at least one of the first pattern region and the second pattern region is provided in plural in one large pattern region.

[0010] In the tire described in claim 3, at least one of the first pattern area and the second pattern area is provided in a plurality of areas within one large pattern area, and therefore the range of expression of the decorative portion can be expanded compared to when at least one of the first pattern area and the second pattern area is not provided in a plurality of areas within one large pattern area. [Effects of the Invention]

[0011] As described above, the tire of the present invention has the excellent effect of being able to widen the range of expression of the decorative portion on the outer surface of the tire. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a plan view showing a decorative portion formed on a tire side portion of a tire according to a first embodiment. FIG. [Figure 2] FIG. [Figure 3] 1A is an enlarged plan view showing a part of the first pattern region, and FIG. 1B is an enlarged plan view showing a part of the second pattern region. [Figure 4] FIG. 4 is a cross-sectional view showing a first asterisk protrusion. [Figure 5] FIG. 10 is a plan view showing a decorative portion formed on a tire side portion of a tire according to a second embodiment. [Figure 6] FIG. 6 is an enlarged plan view showing a large pattern region of a tire according to a second embodiment. [Figure 7] FIG. 10 is an enlarged plan view showing a large pattern region according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] [First embodiment] A tire 10 according to a first embodiment of the present invention will be described with reference to Figures 1 to 4. Note that arrow C shown in the figures indicates the tire circumferential direction, and arrow R indicates the tire radial direction.

[0014] 1, a decorative portion 14 extending in the tire circumferential direction (the direction of arrow C) is provided on a tire side portion 12, which is an example of the outer surface of a tire 10. The decorative portion 14 is arc-shaped when viewed from the axial direction of the tire 10, and is arranged at an arbitrary position in the tire circumferential direction.

[0015] The tire side portion 12 other than the decorative portion 14 is a smooth surface like a normal tire. The smooth surface portion of the tire side portion 12 is referred to as a base surface 16 as appropriate.

[0016] The decorative portion 14 includes a plurality of large pattern regions 18. The large pattern regions 18 are arranged in the tire radial direction (direction of arrow R) and in the tire circumferential direction (direction of arrow C). The large pattern regions 18 of this embodiment are generally arrow feather shaped in a plan view of the tire side portion 12, and adjacent large pattern regions 18 in the tire radial direction are arranged facing in opposite directions.

[0017] A gap S with a smooth surface is provided between adjacent pattern large regions 18 so as to connect to the base surface 16. In other words, the pattern large regions 18 are partitioned by smooth surfaces.

[0018] Preferably, three or more large pattern regions 18 are arranged in the tire circumferential direction, and more preferably, five or more large pattern regions 18 are arranged in the tire circumferential direction.

[0019] The large pattern region 18 is configured to include a first pattern region 20 and a second pattern region 22 that is disposed adjacent to the first pattern region 20 and has a higher brightness than the first pattern region 20 .

[0020] The first pattern region 20 is made up of regions 20a, 20b, 20c, 20d, 20e, and the like, which are different in size and shape.

[0021] The second pattern region 22 is made up of regions 22a, 22b, 22c, 22d, 22e, and the like, which are different in size and shape.

[0022] Furthermore, regions 20a, 20b, 20c, 20d, and 20e of the first pattern region 20 are symmetrical to regions 22a, 22b, 22c, 22d, and 22e of the second pattern region 22 across the axis of symmetry CL.

[0023] Next, the first pattern region 20 has a lower brightness than the base surface 16 and appears black compared to the base surface 16. The second pattern region 22 has a higher brightness than the first pattern region 20 and a lower brightness than the base surface 16. That is, the brightness decreases in the order of the base surface 16, the second pattern region 22, and the first pattern region 20, and the second pattern region 22 appears black compared to the base surface 16, and the first pattern region 20 appears black compared to the second pattern region 22, with the first pattern region 20 appearing the blackest.

[0024] In addition, by providing minute irregularities in the parts corresponding to the first pattern region 20 and the second pattern region 22 in the mold (metal mold) for forming the tire 10, the first pattern region 20 and the second pattern region 22 can be formed on the surface of the tire side portion 12.

[0025] In the first pattern region 20 and the second pattern region 22, minute protrusions are formed that protrude from the base surface 16, which makes the surfaces of the first pattern region 20 and the second pattern region 22 uneven.

[0026] In the first pattern region 20 and the second pattern region 22, a first asterisk protrusion 34 and a second asterisk protrusion 36, which are examples of protrusions, are formed similarly to each other. The shapes of the first asterisk protrusion 34 and the second asterisk protrusion 36 are similar in their respective regions. The distance P between the adjacent first asterisk protrusion 34 and second asterisk protrusion 36 varies according to the similarity ratio.

[0027] As described above, the shapes of the first asterisk protrusion 34 and the second asterisk protrusion 36 are similar in each region. Therefore, the shapes of the first asterisk protrusion 34 and the second asterisk protrusion 36 will be described below using the first pattern region 20 as an example.

[0028] (First pattern area 20) 3(A), the first pattern region 20 has a plurality of first asterisk protrusions 34 and a plurality of second asterisk protrusions 36 protruding from the base surface 16. The first asterisk protrusions 34 and the second asterisk protrusions 36 are arranged alternately in the tire circumferential direction and the tire radial direction.

[0029] (First asterisk protrusion 34) As shown in FIG. 3(A), the first asterisk protrusion 34 has a plurality of extension portions 34E, six in this embodiment, extending in different directions from a center O1 as a base point when viewed from a direction perpendicular to the base surface 16 (the direction of the rotational axis of the tire 10).

[0030] The six extending portions 34E form an angle of 60° with the adjacent extending portions 34E. In other words, the first asterisk protrusion 34 has six extending portions 34E extending radially from the center O1.

[0031] As shown in FIG. 4, the cross section of the extending portion 34E of the first asterisk protrusion 34 perpendicular to the extending direction is a substantially isosceles triangle having a flat top surface 34C. That is, the first asterisk protrusion 34 has the top surface 34C and a pair of side surfaces 34D. In this embodiment, the width of the top surface 34C (W1 in the figure) is 0.02 mm, and the apex angle of the first asterisk protrusion 34 (D in the figure) is 26 degrees. The height of the first asterisk protrusion 34 (H in the figure) is a predetermined value between 0.05 mm and 1.0 mm. If the protrusion height (protrusion height) is less than 0.05 mm, it may be difficult to form the protrusion and may not be able to attenuate incident light and reduce the brightness to a level that appears black. Furthermore, by making the height of the protrusion 1.0 mm or less, the difference in rigidity between the protrusion and the area surrounding the protrusion is reduced, thereby suppressing localized stress concentration.

[0032] In this embodiment, the height of the protrusions and the dimensions of the spacing (pitch) between the protrusions, which will be described later, can be measured using, for example, a one-shot 3D shape measuring instrument, VR-3000 series, manufactured by Keyence Corporation.

[0033] (Second asterisk protrusion 36) 3(A), the second asterisk protrusion 36 has the same shape as the first asterisk protrusion 34. Specifically, when viewed from a direction perpendicular to the base surface 16, the second asterisk protrusion 36 has a shape obtained by rotating the first asterisk protrusion 34 clockwise by 90 degrees about the center O1 and then rotating it another 90 degrees about the center O1 and then inverting the first asterisk protrusion 34. That is, the second asterisk protrusion 36 has six extension portions 36E extending in different directions from the center O2 serving as a base point, and each extension portion 36E has a top surface 36C and a side surface 36D.

[0034] The first asterisk projections 34 and the second asterisk projections 36 are arranged alternately in the tire circumferential direction and the tire radial direction, filling each entire region.

[0035] In addition, the distance between the center O1 and the center O2 of the first asterisk protrusion 34 and the second asterisk protrusion 36 adjacent to each other in the tire radial direction and the tire circumferential direction (hereinafter referred to as "distance P") is 0.1 The distance P is set to a predetermined value of 0.1 mm or more and 1.0 mm or less. If the distance P is less than 0.1 mm, it becomes difficult to form the protrusions. Furthermore, if the distance P is greater than 1.0 mm, it may not be possible to attenuate the incident light and reduce the brightness to a level that makes the color appear black.

[0036] (Second pattern area 22) Next, the second pattern region 22 will be described. 3(B), the second pattern region 22 has first asterisk protrusions 34 and second asterisk protrusions 36 formed therein that are similar in shape to those in the first pattern region 20, but the density of the protrusions formed therein is lower than the density of the protrusions formed in the first pattern region 20. This makes the second pattern region 22 appear brighter than the first pattern region 20.

[0037] Here, the first pattern region 20 and the second pattern region 22 described in this embodiment are regions where the lightness L* value measured using a handheld spectrocolorimeter (NF333) manufactured by Nippon Denshoku Industries Co., Ltd. is, for example, less than 20. The lightness L* value ranges from 0 to 100, with values ​​closer to 0 appearing blacker and values ​​closer to 100 appearing whiter.

[0038] In this embodiment, the value of lightness L* of the base surface 16 is set to 23, for example, the value of lightness L* of the second pattern region 22 is set to 15, and the value of lightness L* of the first pattern region 20 is set to 5. The value of lightness L* of each region can be changed as needed.

[0039] The total area of ​​the first pattern region 20 and the second pattern region 22 per decorative portion 14 can be set within a range of, for example, 50% to 95%.

[0040] (Action, effect) Next, the effects of the tire 10 according to this embodiment will be described.

[0041] In other areas of the tire side portion 12 where no protrusions are formed, that is, in the base surface 16 , the incident light is reflected outward by the smooth outer surface that constitutes the base surface 16 . In contrast, in the first pattern region 20 and the second pattern region 22, light incident on the first asterisk protrusion 34 and the second asterisk protrusion 36 hits the side surfaces 34D and 36D shown in FIG. 4. The incident light is then attenuated and reflected outward while repeatedly reflecting between the opposing side surfaces 34D and 36D. Therefore, the first pattern region 20 and the second pattern region 22 appear black compared to the base surface 16.

[0042] Furthermore, since the apex angles of the respective protrusions are similar, the area occupied per unit area by the base surface 16 of the second pattern region 22 is larger than the area occupied per unit area by the base surface 16 of the first pattern region 20.

[0043] As a result, the amount of light reflected outward in the second pattern region 22 is greater than the amount of light reflected outward in the first pattern region 20. That is, the lightness L* of the second pattern region 22 is higher than that of the first pattern region 20. In other words, the second pattern region 22 appears relatively brighter than the first pattern region 20, and the first pattern region 20 appears relatively darker than the second pattern region 22.

[0044] In this way, the decorative part 14 is configured to include a first pattern area 20 and a second pattern area 22 that is arranged adjacent to the first pattern area 20 and has a higher brightness than the first pattern area 20, and is equipped with a plurality of large pattern areas 18 separated by gaps S which are smooth surfaces.Therefore, compared to decorative parts that are not configured in this manner, the decorative part 14 of this embodiment can greatly expand the range of expression.

[0045] Furthermore, the visibility of the large pattern area 18 can be improved by determining the width of the gap S so that the total area of ​​the first pattern area 20 and the second pattern area 22 per decorative part 14 is within the range of 50% to 95%.

[0046] [Second embodiment] Next, a tire 10 according to a second embodiment of the present invention will be described. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 5 and 6, the tire 10 of this embodiment includes, in the tire side portion 12, a large pattern region 18 having a contour shape similar to that of the first embodiment.

[0047] As shown in FIG. 6, the large pattern region 18 of this embodiment includes regions 20a, 20b, 20c, 20d, 20e, 22a, 22b, 22c, 22d, and 22e, which have the same contour shape as the large pattern region 18 of the first embodiment, but the shape of the protrusions in each region is different from that of the first embodiment.

[0048] Regions 20a, 20b, 20c, 22a, 22b, and 22c are provided with a plurality of linearly extending rib-like protrusions 38 as an example of protrusions. The rib-like protrusions 38 can also be referred to as ridges (mountain-like protrusions). In the large pattern region 18 of this embodiment, regions 20d, 20e, 22d, and 22e have smooth surfaces. In this embodiment, the contour of the periphery of each region is formed by rib-like protrusions 40.

[0049] The height of the rib-like protrusion 38 is, for example, 0.15 mm, and the apex angle is, for example, 35 degrees. The height of the rib-like protrusion 40 is, for example, 0.2 mm, and the apex angle is, for example, 35 degrees. These heights and apex angles can be changed as appropriate.

[0050] The rib-like protrusions 38 are arranged in parallel in one direction, and the distance P between the center of one rib-like protrusion 38 and the center of the other adjacent rib-like protrusion 38 is the same as the distance between the first asterisk protrusion 34 and the second asterisk protrusion 36 shown in Figure 3.

[0051] In this embodiment, the spacing P of the rib-like protrusions 38 in the second pattern region 22 is wider than the spacing P of the rib-like protrusions 38 in the first pattern region 20, making the second pattern region 22 appear relatively brighter than the first pattern region 20.

[0052] [Other embodiments] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms within the scope of the gist of the present invention.

[0053] For example, in the first embodiment, the first asterisk protrusion 34 and the second asterisk protrusion 36 are connected to each other, but they may not be connected to each other.

[0054] The apex angle (for example, D in FIG. 4) of the protrusions such as the first asterisk protrusion 34 and the second asterisk protrusion 36 is set to 26 degrees, but may be other angles. As the apex angle D increases, the proportion of light reflected by the side surfaces 34D and 36D that returns in the direction of incidence increases, and the lightness L* becomes relatively higher.

[0055] In the above embodiment, the first asterisk protrusion 34 and the second asterisk protrusion 36 each having a plurality of radially extending extensions 34E, and the linearly extending rib-like protrusion 38 are given as examples of protrusions, but the present invention is not limited to this, and the planar shape of the protrusion is not limited to a radial or linear shape, and may also have a so-called grained pattern. The grained pattern refers to patterns including, for example, leather patterns, matte patterns, wood grain patterns, fabric patterns, and geometric patterns.

[0056] Furthermore, the shapes of the first pattern region 20 and the second pattern region 22 are not limited to those shown in the above embodiment, and may be any shape, such as a rectangular shape as shown in FIG.

[0057] The large pattern region 18 in the above embodiment includes two pattern regions with different brightness levels, but may include three or more pattern regions with different brightness levels. [Explanation of symbols]

[0058] 10... tire, 12... tire side portion (outer surface of tire), 14... decorative portion, 16... base surface (smooth surface), S... gap (smooth surface), 18... large pattern area, 20... first pattern area, 22... second pattern area, 34... first asterisk protrusion (uneven), 36... second asterisk protrusion (uneven), 38... rib-like protrusion (uneven)

Claims

1. The tire has a plurality of large pattern areas arranged along the tire circumferential direction on the outer surface of the tire, each of which is formed by projections and recesses and is partitioned by smooth surfaces, The large pattern region includes a first pattern region and a second pattern region that is disposed adjacent to the first pattern region and has a higher brightness than the first pattern region, and the first pattern region and the second pattern region are adjacent to each other across an axis of symmetry and have symmetrical shapes. tire.

2. The large pattern region is arranged in plurality in the tire radial direction on the tire side portion.

2. The tire of claim 1.

3. a plurality of at least one of the first pattern regions and the second pattern regions are provided in one large pattern region; The tire according to claim 1 or claim 2.

4. The large pattern region has an arrow feather shape in a plan view of the tire side portion. The tire according to any one of claims 1 to 3.

Images