JPH11291722A - Pneumatic tire provided with annular ornamental unit formed by many ridges - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent conspicuousness of irregularity generated in a side wall of a tire and to prevent or suppress inferiority of outward appearance in the tire generated in an adjacent part between a cut start and a cut end with an edge point of a cutting tool gradually worn in the case of forming a recessed part in a mold. SOLUTION: In a pneumatic tire provided with a circular annular ornamental unit S formed by many small ridges (r) of about 0.3 to 2 mm height by providing a small space of about 0.3 to 5 mm apart in a peripheral direction in a surface of at least one side wall, the ridge (r) is extended continuously almost in parallel to each other between from an inner side end edge M to an outer side end edge N in a radial direction of the circular annular ornamental unit S, a ridge change part C is formed in at least one part during extension from the inner side end edge M to the outer side end edge N in the radial direction of the circular annular ornamental unit S, and a sectional shape of the ridge is made substantially different between inner/outer sides in the radial direction with the ridge change part C serving as a boundary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire having a ring-shaped decorative body formed on a surface of a sidewall and comprising a number of small ridges provided at small intervals in a circumferential direction. It is related to a tire with a tire.

[0002]

2. Description of the Related Art A pneumatic tire is a toroidal or donut-shaped annular body. Generally, the carcass is not manufactured as an annular body from the beginning, but is first manufactured as a sheet-like carcass. The ply is rotated once around the forming drum of the tire and is joined in an annular shape by joining the start and end points of the winding. After that, the green tire molded by attaching necessary structural members such as chafers, breakers or belts and treads is pressed and heated for a certain period of time in a mold made of metal such as steel or aluminum, and vulcanized. By doing so, tires are manufactured. As a result, on the side wall of the vulcanized tire, at the location corresponding to the joint at the beginning and end of the carcass ply,
It becomes larger or smaller, and irregularities occur. The unevenness of the sidewall is not a fatal defect in the performance and durability of the tire, but the unevenness of the sidewall is relatively conspicuous in a radial tire for a car having one ply of carcass ply. This can give the customer unneeded anxiety. In addition, a pneumatic tire generally 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, so that the carcass ply is folded back. The end is located at the side wall, and the side rubber is disposed outside the side wall. In response to requests for lighter tires,
When the side rubber becomes thin, the folded end portion of the carcass ply may become relatively conspicuous as unevenness of the sidewall.

[0003]

Conventionally, in order to make a trade mark or a trade dress formed of letters, numbers, symbols or figures formed on a sidewall of a tire stand out, the surface of the sidewall is conventionally provided with 2. Description of the Related Art A ring-shaped decorative body composed of a number of small ridges having the same height provided at equal intervals in a circumferential direction is provided, and characters, figures, and the like are provided on the decorative body. The inventor, in order to make the above-mentioned unevenness generated in the sidewall of the tire inconspicuous, to form the above-mentioned small ridge provided to make a trademark, a trade dress, etc. conspicuous over a wide range of the sidewall of the tire. came up with. However, the conventional ridge as described above was formed over a wide area of the sidewall,
As a result, the expected effect was not obtained in making the above-mentioned unevenness generated in the sidewall of the tire inconspicuous. Further, in order to form a ridge on the sidewall of the tire, it is necessary to form a concave portion in the mold, and in the process of forming the concave portion, the cutting edge of the cutting tool gradually wears out. When a difference occurs in the cross-sectional shape and the processing around the mold is completed,
Adjacent portions at the beginning and end of the excavation have an uneven pattern, which is not preferable in appearance.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned disadvantages of the prior art, to make the unevenness generated on the sidewall of the tire less noticeable, and to gradually reduce the cutting edge of the cutting tool when forming the concave portion in the mold. An object of the present invention is to provide a pneumatic tire provided with a ridge on a side wall so as to make inconspicuous tire appearance that occurs at adjacent portions at the beginning and end of digging.

[0005]

In order to achieve the above-mentioned object, a pneumatic tire according to the present invention is provided with high-pneumatic tires provided at equal intervals on the circumference at small intervals of about 0.3 to 5 mm in the circumferential direction. (1) A pneumatic tire provided with an annular decorative body composed of a large number of small ridges having a thickness of about 0.3 to 2 mm on at least one side wall surface.
The ridges extend substantially parallel to each other continuously from a radially inner edge to an outer edge of the annular decorative body, and (2) the ridges extend radially inward of the annular decorative body. A ridge change portion is formed at least at one position between the edge and the outer edge, and the ridge has a substantially different cross-sectional shape radially inward and outward from the ridge change portion. The pneumatic tire is characterized in that: Since the pneumatic tire according to the present invention is a tire having such a configuration, the ridge is not a monotonous design as in the related art, but the ridges having substantially different cross-sectional shapes are combined as described above. The balance between light and shadow and the intensity of reflected light change slightly,
By dispersing the line of sight, the irregularities generated on the sidewalls of the tire become inconspicuous, and when forming the concave portion in the mold, the cutting edge of the cutting tool gradually wears out and the poor appearance of the tire occurs at the adjacent portions at the beginning and end of the excavation. Also become inconspicuous.

In order to achieve the above object, in the pneumatic tire according to the present invention, the ridge is bent so that the extending direction of the ridge is opposite to the radial direction with respect to the ridge change point. It is preferable that the shape of the tire is effective in that the balance between light and shadow and the intensity of reflected light are delicately changed, and the unevenness and the poor appearance of the tire, which are generated in the sidewall, are not noticeable.

[0007] In order to achieve the above object, in the pneumatic tire according to the present invention, at the ridge change point, the cross-sectional shape of the ridge changes from a trapezoid to a triangle or from a triangle to a trapezoid. This is preferable because it is effective in that the balance between shadows and shadows and the intensity of reflected light are subtly changed, and the above-mentioned unevenness and poor appearance of the tire caused on the sidewalls are not noticeable.

In order to achieve the above object, in the pneumatic tire according to the present invention, the balance between light and shadow and the intensity of reflected light are delicately changed, and the above-mentioned unevenness and poor appearance of the tire caused on the sidewall are conspicuous. In order to be effective in elimination, the ridge preferably extends with substantially the same base width from the radially inner edge to the outer edge of the annular ornament.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pneumatic tire according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial front view of an annular decorative body S provided on a side wall of a tire according to a first embodiment of the present invention. An annular decorative body S comprising a number of small ridges r having a height h of about 0.4 mm and provided at equal intervals on the periphery at small intervals of about 0.8 mm. The ridges r continuously extend substantially parallel to each other from the radial inner edge M to the outer edge N of the annular decorative body S, and the ridge intervals measured in the circumferential direction are substantially the same. A ridge change portion C is formed at one location while the ridge r extends from the radial inner edge M to the outer edge N of the annular decorative body S.
In the radially inner side and the outer side, a-a cross section and b-
The cross-sectional shape of the ridge r is substantially different as shown in the cross-section b. That is, at the ridge change point C, the cross-sectional shape of the ridge r changes from a triangle as shown in aa section to a trapezoid as shown in bb section. The ridge r extends in a polygonal line so that the ridge r extends in a direction opposite to the radial direction with the ridge change point C as a boundary. That is, the ridge r
However, the ring-shaped decorative body S extends in a left-upward direction from the radial inner edge M to the ridge change point C, and the direction in which the ridge r extends at the ridge change point C is opposite to the opposite direction across the radial direction. As a result, the portion extends from the ridge change point C to the outer edge N in an upward right direction. The ridge r extends with substantially the same base width w from the radial inner edge M to the outer edge N of the annular decorative body S.

FIG. 2 is a partial front view of an annular decorative body S provided on a sidewall of a tire according to a second embodiment of the present invention. The tire of Example 2 is different from the ridge change point C in that the cross-sectional shape of the ridge r changes from a trapezoid as shown in the bb section to a triangle as shown in the aa section. This is almost the same as the tire of the first embodiment.

FIG. 3 is a partial front view of an annular decorative body S provided on a sidewall of a tire according to a third embodiment of the present invention. The tire of Example 3 has a cross section at a ridge change point C, a triangle having a cross-sectional shape indicated by an a-a cross section, and b
From the trapezoidal shape as shown in the bb cross section to the aa cross section, the ridge r as in the first embodiment and the ridge change point C as shown in FIG. The tire is almost the same as the tire of the first embodiment except that the ridges r as in the second embodiment, which change into the triangles as shown, are alternately arranged in the circumferential direction.

FIG. 4 is a partial front view of an annular decorative body S provided on a sidewall of a tire according to a fourth embodiment of the present invention. The tire of Example 4 has the same configuration as that of the tire described above except that the ridge r is formed at four places while the ridge r extends from the radial inner edge M to the outer edge N of the annular decorative body S. It is almost the same as the tire of the first embodiment.

[0014]

According to the pneumatic tire of the present invention, as compared with the conventional tire, the unevenness generated on the sidewall of the tire is made inconspicuous, and when the concave portion is formed in the mold, the cutting edge of the cutting tool is gradually worn and the digging is started. This has the effect of suppressing the poor appearance of the tire occurring at the end adjacent location.

[Brief description of the drawings]

FIG. 1 is a partial front view of a decorative body of a tire according to an embodiment of the present invention.

FIG. 2 is a partial front view of a decorative body of a tire according to an embodiment of the present invention.

FIG. 3 is a partial front view of the decorative body of the tire according to the embodiment of the present invention.

FIG. 4 is a partial front view of the decorative body of the tire according to the embodiment of the present invention.

[Explanation of symbols]

 r Ridge C Ridge change point M Radial inner edge N Radial outer edge S Annular decorative body

Claims (4)

[Claims] 1. An annular decorative body comprising a large number of small ridges having a height of about 0.3 to 2 mm and provided at a small interval of about 0.3 to 5 mm in a circumferential direction. In the pneumatic tire provided on the surface of the side wall of (1), (1) the ridge continuously extends substantially parallel to each other from a radially inner edge to an outer edge of the annular decorative body, (2) at least one ridge change portion is formed while the ridge extends from the radially inner edge to the outer edge of the annular decorative body;
A pneumatic tire characterized in that the ridge has a substantially different cross-sectional shape between the radially inner side and the outer side with respect to the ridge change point. 2. A method according to claim 1, wherein the ridge extends in a direction opposite to the radial direction with respect to the ridge change point.
The pneumatic tire according to claim 1, wherein the ridge extends in a polygonal line. 3. The pneumatic tire according to claim 1, wherein a cross-sectional shape of the ridge changes from a trapezoid to a triangle or from a triangle to a trapezoid at the ridge change point. 4. The ridge according to claim 1, wherein the ridge extends from the radially inner edge to the outer edge of the annular decorative body with substantially the same base width. Pneumatic tire.