JPH0948217A - Pneumatic tire having decorative body constituted of many ridges - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make rugged parts generated on the side wall of a tire inconspicuous, and make inconspicuous poor appearance generated by the edge of a bite at forming a recessed part in a mold so as not to make conspicuous, by alternately providing inward ridges and outward ridges which are extended while gradually increasing the height and gradually decreasing the width, in the circumferential direction on an annular decorative body. SOLUTION: This pneumatic tire is formed with an annular decorative body 1 constituted of many small ridges R1, R2 provided at small intervals under about 5mm in the circumferential direction and having height under about 2mm, on the surface of the side wall. The annular decorative body 1 is alternately provided in the circumferential direction with inward ridges R1 extending from the outside end edge 2 in the radial direction of the decorative body 1 toward the inside end edge 3 in the radial direction while gradually increasing the height and gradually decreasing the width, and outward ridges R2 extending from the inside end edge 3 in the radial direction of the decorative body 1 toward the outside end edge 2 in the radial direction while gradually increasing the height and gradually decreasing the width.

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 an annular ornamental body composed of a large number of small ridges provided at small intervals in the circumferential direction on the surface of a sidewall. It is related to the entry 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 terms of 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 trade marks or trade dresses formed of letters, numbers, symbols or figures formed on the sidewall of the tire stand out, the surface of the sidewall has conventionally been provided with: 2. Description of the Related Art A ring-shaped decorative body composed of many 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 for conspicuous trademark or trade dress 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 this concave portion forming process, the cutting edge of the cutting tool gradually wears out, and the concave portion is formed at the beginning and end of the concave portion. 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 digging have a non-uniform pattern, which is not desirable in appearance.

An object of the present invention is to eliminate the above-mentioned problems of the prior art so as to make the unevenness of the sidewall of the tire inconspicuous, and when the concave portion is formed in the mold, the cutting edge of the cutting tool is gradually worn away and dug. It is an object of the present invention to provide a pneumatic tire having ridges on the sidewalls that make the appearance defects of tires that occur at the beginning and the end of digging adjacent to each other inconspicuous.

[0005]

In order to achieve the above object, a pneumatic tire according to the present invention has a height of 2 mm, which is provided at small intervals of about 5 mm or less in the circumferential direction.
In a pneumatic tire having a side wall with an annular decorative body composed of a number of small ridges of a size less than or equal to about 1, the annular decorative body includes (1) an outer end in the radial direction of the annular decorative body. An inward ridge extending from the edge toward the inner edge in the radial direction while gradually increasing in height and gradually decreasing in width, and (2) from the inner edge in the radial direction to the outer edge in the radial direction of the annular ornament. The pneumatic tire is characterized in that outward ridges extending gradually while gradually increasing in width while gradually increasing in height are provided alternately in the circumferential direction. The pneumatic tire according to the present invention has such a configuration, and is not a monotonous design as in the past,
Since the inward ridge and the outward ridge are combined as described above, the balance of light and shadow and the intensity of reflected light are subtly changed, and the line of sight is dispersed, so that the tire side walls The resulting irregularities become inconspicuous, and the blade edge of the cutting tool is gradually worn away when the recess is formed in the mold, so that the appearance defect of the tire occurring at the adjacent portions at the beginning and the end of the digging becomes inconspicuous.

In order to achieve the above object, in the pneumatic tire according to the present invention, the annular decorative body has substantially the radial outer side edge to the radial inner side edge of the annular decorative body. It is preferable that a third ridge extending with the same depth and width is provided, and further, the inward ridge and the outward ridge are alternately provided in the circumferential direction with the third ridge sandwiched therebetween. It is preferable. With such a configuration, the balance between light and shadow and the intensity of reflected light are subtly changed, and the line of sight is dispersed, so that the above-mentioned unevenness generated on the sidewall of the tire becomes inconspicuous and a concave portion is formed in the mold. At the same time, the cutting edge of the cutting tool is gradually worn away, and the poor appearance of the tire occurring at the adjacent portions at the beginning and end of the digging becomes inconspicuous.

To achieve the above object, in the pneumatic tire according to the present invention, it is preferable that the inward ridge and the outward ridge extend in the direction of 0 to 40 degrees with respect to the radial direction. With such a configuration, the balance between light and shadow and the intensity of reflected light are subtly changed, and the line of sight is dispersed, so that the above-mentioned unevenness generated on the sidewall of the tire becomes inconspicuous and a concave portion is formed in the mold. At the same time, the cutting edge of the cutting tool is gradually worn away, and the poor appearance of the tire occurring at the adjacent portions at the beginning and end of the digging becomes inconspicuous.

To achieve the above object, in the pneumatic tire according to the present invention, it is preferable that the third ridge extends in the direction of 0 to 40 degrees with respect to the radial direction.
With such a configuration, the balance between light and shadow and the intensity of reflected light change subtly, and the line of sight is dispersed,
In addition to making the above-mentioned concavities and convexities generated on the side wall of the tire inconspicuous, the cutting edge of the cutting tool is gradually worn away when the recess is formed in the mold, and the poor appearance of the tire occurring at the adjacent portions at the beginning and end of the digging is also not noticeable.

In order to achieve the above object, the pneumatic tire according to the present invention may have the same height of the ridges or may be composed of two or more kinds of ridges having different heights.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 according to the present invention will be described below.
The tires Nos. 1 to 2 and the tires of Conventional Examples 1 to 2 will be described with reference to the drawings.

FIG. 1 is a partial front view of a decorative body 1 including a large number of small ridges R1 and R2 provided on a surface of a side wall of a tire according to a first embodiment of the present invention at small intervals in a circumferential direction. Is. The pneumatic tire of Example 1 according to the present invention has a large number of small ridges having a height of 0.1 to 0.6 mm, which are provided on the surface of the sidewall at small intervals of about 1.8 mm in the circumferential direction. R1 and R2
The ring-shaped ornamental body 1 is provided. As shown in the figure, in the annular ornament 1, the width gradually decreases while gradually increasing in height from the radially outer end 2 of the annular ornament 1 toward the radially inner end 3. An inwardly extending ridge R1 that extends and an outwardly extending ridge R2 that gradually decreases in width while gradually increasing in height from the radially inner edge 3 of the annular ornament 1 toward the radially outer edge 2. They are provided alternately in the circumferential direction. The ridge height of the inward ridge R1 is 0.1 mm at the outer edge 2 in the radial direction, but extends inward while gradually increasing its height, and becomes 0.6 mm at the inner edge 3 in the radial direction. On the other hand, the ridge height of the outward ridge R2 is 0.1 mm at the inner edge 3 in the radial direction, extends outward while gradually increasing its height, and becomes 0.6 mm at the outer edge 2 in the radial direction. In the tire of Example 1, the inward ridge R1 and the outward ridge R1
2 extends in the radial direction, the present invention is not limited to this, and the inward ridge R1 and the outward ridge R
2 can extend in a direction of 0 to 40 degrees with respect to the radial direction.

FIG. 2 shows a part of a decorative body 1 consisting of a large number of small ridges R1, R2, R3 provided at small intervals in the circumferential direction on the surface of a side wall of a tire according to a second embodiment of the present invention. It is a front view. The tire of Example 2 is
The tire is almost the same as the tire of the first embodiment except that a third ridge R3 is provided in addition to the inward ridge R1 and the outward ridge R2. The third ridge R3 extends from the outer edge 2 in the radial direction to the inner edge 3 in the radial direction of the annular ornament 1 with substantially the same height (0.1 mm) and the same width (20 mm). In the tire of Example 2, the inward ridge R1 and the outward ridge R2 are the third ridge R1.
3, the inward ridges R1, the outward ridges R2, and the third ridges R3 all extend in the radial direction, and the present invention is not limited to this. Inward ridge R1, outward ridge R
2 and the third ridge R3 can extend in a direction in the range of 0 to 40 degrees with respect to the radial direction. You.

FIG. 3 is a partial front view of a decorative body 1 composed of a large number of small ridges R provided on the surface of the sidewall of the tire of Conventional Example 1 at small intervals in the circumferential direction. The ridge R extends linearly over the entire area of the decorative body 1 at an angle of 0 degree with respect to the meridian of the tire.

FIG. 4 is a partial front view of a decorative body 1 including a large number of small ridges R provided on the surface of a sidewall of a tire of Conventional Example 2 at small intervals in the circumferential direction. The ridge R extends linearly over the entire region of the ornamental body 1, but extends linearly at an angle of 18 degrees to the right with respect to the meridian of the tire on the outer side in the radial direction and with respect to the meridian of the tire on the inner side in the radial direction. It extends linearly at an angle of 45 degrees to the left.

With regard to the tires of Examples 1 and 2 and the tires of Conventional Examples 1 and 2, the degree of conspicuous unevenness on the sidewall of the tire 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 being 100. The larger the number, the better the visibility.

[0016]

[Table 1]

[0017]

From the results shown in Table 1, in the pneumatic tire of the present invention, the unevenness generated in the sidewall of the tire is made inconspicuous, and the cutting edge of the cutting tool is gradually worn away when the concave portion is formed in the mold. It can be seen that the appearance defect of the tire occurring at the adjacent portion after the digging is suppressed.

[Brief description of drawings]

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

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

FIG. 3 is a partial front view of a conventional tire decorative body.

FIG. 4 is a partial front view of a conventional tire decorative body.

[Explanation of symbols]

 1 Decorative body 2 Radial outer edge 3 Radial inner edge R1 Inward ridge R2 Ridge R3 Third ridge

Claims (5)

[Claims] 1. A pneumatic tire having an annular decorative body, which is provided at a small interval of about 5 mm or less in the circumferential direction and is composed of a large number of small ridges having a height of about 2 mm or less, on the surface of a side wall. In the above-mentioned annular ornament, (1) the width gradually decreases while gradually increasing its height from the radially outer edge of the annular ornament to the radially inner edge thereof. The facing ridges and (2) the outward facing ridges that extend while gradually decreasing in width while gradually increasing in height from the radially inner end edge of the annular ornament to the radially outer end edge thereof. Pneumatic tire characterized by being provided in. 2. The annular ornament is provided with a third ridge that extends from the radially outer edge of the annular ornament to the radially inner edge of the annular ornament with substantially the same depth and width. The pneumatic tire according to claim 1, wherein: 3. The pneumatic tire according to claim 2, wherein the inward ridges and the outward ridges are provided alternately in the circumferential direction with the third ridge sandwiched therebetween. 4. The pneumatic tire according to claim 1, wherein the inward ridge and the outward ridge extend in the direction of 0 to 40 degrees with respect to the radial direction. 5. The pneumatic tire according to claim 2, wherein the third ridge extends in a direction of 0 to 40 degrees with respect to the radial direction.