JP3667818B2 - Pneumatic tire with a decorative body consisting of many ridges - Google Patents

Description

【００２０】
【発明の効果】
表１に示す結果から、本発明の空気入りタイヤは、タイヤのサイドウオールに生じる凹凸を目立たなくするとともに、モールドに凹部を形成する際バイトの刃先が次第に摩滅し掘り初めと掘り終わりの隣接個所に生じるタイヤの外観不良を抑制することが優れていることが分かる。
【図面の簡単な説明】
【図１】本発明による実施例のタイヤの、装飾体の一部正面図とＡ−Ａ断面図である。
【図２】本発明による実施例のタイヤの、装飾体の一部正面図とＡ−Ａ断面図である。
【図３】本発明による実施例のタイヤの、装飾体の一部正面図とＡ−Ａ断面図である。
【図４】従来例のタイヤの、装飾体の一部正面図とＡ−Ａ断面図である。
【図５】本発明によりタイヤの装飾体の変形デザイン例である。
【図６】本発明によりタイヤの装飾体の変形デザイン例である。
【図７】本発明によりタイヤの装飾体の変形デザイン例である。
【図８】本発明によりタイヤの装飾体の変形デザイン例である。
【符号の説明】
Ｈ リッジの高さ
Ｈ1 低いリッジの高さ
Ｈ2 高いリッジの高さ
Ｒ リッジ
Ｒ1 低いリッジ
Ｒ2 高いリッジ[0001]
[Industrial application fields]
The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire provided with an annular decorative body made up of a large number of small ridges provided on the surface of a side wall at small intervals in the circumferential direction.
[0002]
[Prior art]
A pneumatic tire is a toroidal or donut-shaped torus, but in general, the carcass is not manufactured as a torus from the beginning, but first the carcass ply manufactured in the form of a sheet is molded into the tire. It is rotated around the drum and is pasted in an annular shape by jointing the beginning and end of the winding. After that, raw tires molded by attaching necessary structural members such as chafers, breakers or belts and treads are pressed and heated for a certain period of time in a mold made of metal such as steel or aluminum, and vulcanized. Thus, a tire is manufactured.
As a result, the side wall of the vulcanized tire is more or less uneven at portions corresponding to the joints at the beginning and end of the carcass ply. The unevenness of the side wall is not a fatal defect in terms of performance and durability of the tire, but the unevenness of the side wall is relatively conspicuous in a radial tire for a passenger car with one carcass ply. Can cause unnecessary anxiety to customers.
In general, a pneumatic tire has a pair of left and right bead cores, and the carcass ply is folded back from the inside to the outside and moored to the bead portion. The end portion is located on the side wall, and the side rubber is disposed on the outside thereof. When the side rubber becomes thin in response to a request for weight reduction of the tire, the folded end portion of the carcass ply may become relatively conspicuous as the unevenness of the side wall.
[0003]
[Problems to be solved by the invention]
Conventionally, on the surface of the side wall, it has been provided at equal intervals in the circumferential direction in order to make a trademark or a trade dress made up of letters, numbers, symbols or figures formed on the side wall of the tire stand out. A large number of small ring-shaped decorative bodies made of ridges having the same height are provided, and characters and figures are provided on the decorative body.
In order to make the unevenness generated in the tire side wall inconspicuous, the inventor has to form the small ridge provided to make a trademark, a trade dress, etc. conspicuous over a wide range of the tire side wall. came up with.
However, the conventional ridges as described above were formed over a wide area of the side wall, but as a result, the expected effect was not obtained in making the above unevenness generated in the side wall of the tire inconspicuous. .
In addition, in order to form a ridge on the tire sidewall, it is necessary to form a recess in the mold, and the cutting edge of the cutting tool gradually wears during the recess forming process, and the recess is not formed at the beginning and end of the recess. When a difference occurs in the cross-sectional shape and the processing of one round of the mold is finished, the adjacent portions at the beginning and the end of the digging become a non-uniform pattern, which is not preferable in appearance.
[0004]
The object of the present invention is to eliminate the above-mentioned problems of the prior art and to make the unevenness generated in the tire sidewall inconspicuous, and when the recess is formed in the mold, the cutting edge of the bite is gradually worn out and dug at the beginning It is an object of the present invention to provide a pneumatic tire having a side wall with a ridge that prevents or suppresses a poor appearance of the tire that occurs at an adjacent portion at the end.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a pneumatic tire according to the present invention is an air equipped with an annular decorative body composed of a large number of small ridges provided at small intervals in the circumferential direction on the surface of a tire sidewall. In the entering tire, the above-mentioned many ridges are linear and have two different heights in the tire radial direction at an angle of 0 to 70 degrees with respect to the meridian of the tire so that the unevenness of the sidewall surface becomes inconspicuous. The pneumatic tire is configured by alternately arranging the ridges, and has a height of 0.3 to 2 mm and a circumferential interval of 0.3 to 5 mm.
[0006]
In order to achieve the above object, in the pneumatic tire according to the present invention, it is preferable that the ridge extends at an angle of 0 to 70 degrees with respect to the meridian of the tire, and in particular, extends at an angle of 0 to 40 degrees.
[0007]
In order to achieve the above object, in the pneumatic tire according to the present invention, it is preferable that the virtual surface connecting the highest portions of the ridge is the same as the surface (virtual surface) of the sidewall.
In this specification, the “surface of the side wall (virtual surface)” means that if the rim is not formed on the annular decorative body, it would have existed at the position of the annular decorative body on the surface of the tire. Refers to the side wall surface.
In order to achieve the above object, in the pneumatic tire according to the present invention, the bottom surface of the recess formed between the ridge and the adjacent ridge is the same as the surface (virtual surface) of the side wall. A pneumatic tire is preferred.
In the present specification, the “bottom surface of the concave portion between adjacent ridges” is a virtual surface connecting the deepest portion of the concave portion to be precise.
[0008]
In order to achieve the above object, in the pneumatic tire according to the present invention , it is preferable that the cross-sectional shape of the ridge is similar . In order to achieve the above object, in the pneumatic tire according to the present invention, the side wall angle of the ridge is preferably the same , and more specifically, the side wall angle is preferably 45 degrees.
[0009]
In order to achieve the above object, in the pneumatic tire according to the present invention, it is preferable that the height difference between the two types of ridges having different heights is 0.3 to 1 mm.
[0010]
[Action]
The pneumatic tire according to the present invention is a pneumatic tire provided with an annular decorative body made of a large number of small ridges provided at small intervals in the circumferential direction on the surface of a sidewall of the tire. Is configured by alternately arranging two types of ridges having different heights that are continuous in the tire radial direction at an angle of 0 to 70 degrees with respect to the meridian of the tire. 3 to 2 mm, circumferential spacing is 0.3 to 5 mm, the height of the ridge is not constant as in the past, and a high ridge and a low ridge are combined. When the strength changes slightly and the line of sight is dispersed, the unevenness generated in the tire sidewall becomes inconspicuous, and the cutting edge of the cutting tool gradually forms when forming the recess in the mold. Flashes digging tire appearance defect also becomes inconspicuous that occur in adjacent locations of the end digging the beginning. Further, when processing the recess of the mold corresponding to the ridge of the tire into the mold for producing the pneumatic tire according to the present invention as described above, the deep recess is first processed all around, and then the shallow recess is completely removed later. Machining efficiency is increased by circumferential machining. The straight ridges are continuous in the tire radial direction at an angle of 0 to 70 degrees, preferably 0 to 40 degrees with respect to the meridian of the tire, so that the balance between light and shadow and the intensity of reflected light change slightly. It is effective.
[0011]
In order to manufacture the pneumatic tire according to the present invention in which a ridge is provided on the surface of the side wall, it is necessary to form a recess corresponding to the ridge on the inner surface of the mold and vulcanize the tire with the mold. . In order to form a concave portion corresponding to the ridge on the inner surface of the mold, the concave portion is directly formed on the inner surface of the mold, or a portion corresponding to an annular decorative body is projected in advance on the inner surface of the mold. Either of the mold processing methods is adopted in which the concave portion is formed in the protruding portion. In the former processing method, a space for the cutting edge of the cutting tool to escape is necessary, and it is necessary to dig a groove above and below the part corresponding to the annular decorative body, but in the latter processing method, the cutting edge of the cutting tool is free to escape. You do n’t need to. Which processing method is preferable depends on the design of the ridge formed on the annular decorative body. In other words, which processing method is preferable in terms of the appearance of the tire is selected according to the design of the ridge. Further, in the latter processing method, the rubber amount of the sidewall can be reduced for the portion corresponding to the annular decorative body, which leads to a reduction in the tire weight, though slightly. On the other hand, in a tire where the rubber thickness of the side wall has already been reduced to the limit, the cord may be exposed by the latter processing method, and the former processing method is safe. When the tire is vulcanized with a mold by the latter processing method, in the pneumatic tire according to the present invention, it is preferable that the virtual surface connecting the highest portion of the ridge is the same as the surface (virtual surface) of the sidewall. In the case of vulcanizing a tire with a mold by the former processing method, in the pneumatic tire according to the present invention, the bottom surface of the recess formed between the ridge and the adjacent ridge is the same as the surface (virtual surface) of the side wall. It is preferable. Similarly, from the viewpoint of ease of molding work, it is preferable that the cross-sectional shape of the ridge is similar and the side wall angle of the ridge is the same, and more specifically, the side wall angle is 45 degrees.
[0012]
【Example】
Hereinafter, tires of Examples 1 to 3 and a conventional tire according to the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a partial front view and a cross-sectional view taken along line AA of a decorative body made up of a large number of small ridges provided at small intervals in the circumferential direction on the surface of the sidewall of the tire according to the first embodiment of the present invention. is there.
The tire of Example 1 includes an annular decorative body made up of a large number of small ridges (R1, R2) provided at small intervals in the circumferential direction on the surface of the sidewall, and the low ridge (R1) is the tire. It extends at an angle of 35 degrees with respect to the meridian, and the high ridge (R2) also extends at approximately the same angle, but the direction is shown with a radius of curvature of 30 mm near the radially inner and outer edges of the ornament. Has changed. The low ridge (R1) and the high ridge (R2) are alternately arranged in the circumferential direction, the circumferential interval is 2 mm, the height (H1) of the low ridge (R1) is 0.3 mm, and the high ridge ( The height of (R2) is (H2) 0.6 mm, and the height difference of the ridge is 0.3 mm.
The bottom surface of the recess formed between the ridge (R1, R2) and the adjacent ridge (R1, R2) is the same as the surface (virtual surface) of the sidewall. Both the low ridge (R1) and the high ridge (R2) have a sidewall angle of 45 degrees.
[0014]
FIG. 2 is a partial front view and a cross-sectional view taken along line AA of a decorative body made up of a large number of small ridges provided on the surface of the sidewall of the tire of Example 2 according to the present invention at small intervals in the circumferential direction. is there.
In the tire of Example 2, the low ridge (R1) extends linearly at an angle of 0 degrees with respect to the meridian of the tire, and the high ridge (R2) extends linearly at an angle slightly inclined with respect to the meridian of the tire. Two low ridges (R1) and one high ridge (R2) are sequentially arranged in the circumferential direction, and the circumferential interval between the low ridges (R1) is 0.6 mm, and the low ridge (R1) and the high ridge (R2) is substantially the same as the tire of Example 1 except that the circumferential interval is 2 mm.
[0015]
FIG. 3 is a partial front view and a cross-sectional view taken along line AA of a decorative body made up of a large number of small ridges provided on the surface of the side wall of the tire of Example 3 according to the present invention at small intervals in the circumferential direction. is there.
In the tire of Example 3, the ridges (R1, R2) extend linearly at an angle of 0 degrees with respect to the meridian of the tire, and the circumferential distance between the ridges (R1, R2) is as low as 1.0 mm. The height (H1) of the ridge (R1) is 0.25 mm, the height (H2) of the high ridge (R2) is 0.5 mm, and the difference in height between the ridges is 0.25 mm. This is the same as the tire of Example 2.
[0016]
FIG. 4 is a partial front view and a cross-sectional view taken along line AA of a decorative body made up of a large number of small ridges provided on the surface of a sidewall of a conventional tire at a small interval in the circumferential direction.
The tire of the conventional example is an annular decorative body comprising a large number of small ridges (R) provided on the surface of the sidewall at an angle of 0 degrees with respect to the meridian of the tire and provided at small intervals in the circumferential direction. The ridge (R) has a circumferential interval of 2 mm and a height (H) of 0.4 mm.
[0017]
FIGS. 5 to 8 are examples of modified designs of tire decorative bodies according to the present invention.
[0018]
For the tires of Examples 1 to 3 and the tire of Conventional Example 1 without a ridge and the tire of Conventional Example 2 shown in FIG. 4, the degree of concavity and convexity generated on the tire sidewall was visually evaluated. The evaluation results are shown in Table 1 with the evaluation result of the tire of Conventional Example 1 having no ridge as 100. Larger numbers indicate better visibility.
For the tires of Examples 1 to 3 and the tires of Conventional Examples 1 and 2, the degree to which the unevenness generated in the tire sidewalls was noticeable was visually evaluated. The evaluation results are shown in Table 1 with the evaluation result of the tire of Conventional Example 1 being 100. Larger numbers indicate better visibility.
Similarly, for the tires of Examples 1 to 3 and the tire of Conventional Example 2, the degree to which the appearance defect of the tire due to abrasion of the cutting edge of the cutting tool during molding was noticed was visually evaluated. The evaluation results are shown in Table 1 with the evaluation result of the tire of Conventional Example 2 as 100. Larger numbers indicate better visibility.
[0019]
[Table 1]

[0020]
【The invention's effect】
From the results shown in Table 1, the pneumatic tire of the present invention makes the unevenness generated in the tire sidewall inconspicuous, and the cutting edge of the bite gradually wears when forming the recess in the mold, and adjacent portions at the beginning and end of digging. It can be seen that it is excellent to suppress the appearance defect of the tire occurring in the above.
[Brief description of the drawings]
FIG. 1 is a partial front view and AA cross-sectional view of a decorative body of a tire according to an embodiment of the present invention.
FIG. 2 is a partial front view and AA cross-sectional view of a decorative body of a tire according to an embodiment of the present invention.
FIG. 3 is a partial front view and AA cross-sectional view of a decorative body of a tire according to an embodiment of the present invention.
FIG. 4 is a partial front view and AA cross-sectional view of a decorative body of a conventional tire.
FIG. 5 is a modified design example of a tire decorative body according to the present invention.
FIG. 6 is a modified design example of a tire decorative body according to the present invention.
FIG. 7 is a modified design example of a tire decorative body according to the present invention.
FIG. 8 is a modified design example of a tire decorative body according to the present invention.
[Explanation of symbols]
H Ridge height H1 Low ridge height H2 High ridge height R Ridge R1 Low ridge R2 High ridge

Claims (9)

In the pneumatic tire provided with an annular decorative body made of a large number of small ridges provided on the surface of the side wall at small intervals in the circumferential direction,
The plurality of ridges are two types of ridges that are linear and have different heights in the tire radial direction at an angle of 0 to 70 degrees with respect to the meridian of the tire so that the unevenness of the sidewall surface becomes inconspicuous. A pneumatic tire characterized by being arranged and having a height of 0.3 to 2 mm and a circumferential interval of 0.3 to 5 mm. The pneumatic tire according to claim 1, wherein the ridge extends at an angle of 0 to 40 degrees with respect to the meridian of the tire. 3. The pneumatic tire according to claim 1, wherein a virtual surface connecting the highest portions of the ridge is the same as a surface (virtual surface) of the sidewall. The pneumatic tire according to claim 1 or 2, wherein a bottom surface of a recess formed between the ridge and an adjacent ridge is the same as a surface (imaginary surface) of the side wall. The pneumatic tire according to any one of claims 1 to 4, wherein the ridges have the same sidewall angle. The pneumatic tire according to claim 5, wherein a side wall angle of the ridge is 45 degrees. The pneumatic tire according to any one of claims 1 to 6, wherein a cross-sectional shape of the ridge is similar. The pneumatic tire according to any one of claims 1 to 7, wherein a difference in height between the two types of ridges having different heights is 0.3 to 1 mm. The pneumatic tire according to claim 8, wherein a difference in height between the two types of ridges having different heights is 0.4 to 0.7 mm.

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