JP2003320818A - Tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a concealing effect of an external appearance defective such as bulge/dent, etc., and visibility of a marking in a serration on the surface of a side wall. <P>SOLUTION: A belt-shaped decorative part 3 constituted of a first serration 6 and a marking display part 4 constituted of a second serration 8 arranged within the decorative part 3 are provided on the surface 2S of the side wall. At least one of the first and second serrations 6 and 8 is constituted of an eccentric serration 9 formed by a ridge 10 extended on a radial direction line J extended from an eccentric center C positionally deviated from a tire rotation center O. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire having a mark display portion formed in a decorative portion formed of serrations provided on the surface of a sidewall.

[0002]

2. Description of the Related Art In order to improve the visibility of a mark display portion consisting of letters, numbers, figures, etc. on the sidewall surface of a tire, it is called a bulge or a dent. In order to make the uneven appearance defect inconspicuous, as shown in FIG. 7, a strip-shaped decorative portion b made of serrations a in which ridges a1 are juxtaposed is provided, and the mark display portion is provided in the decorative portion b. forming c.

The serration a of the decorative portion b is conventionally formed by a ridge a1 extending from the tire rotation center O on a radial line extending at an equal angular pitch. Therefore, in the conventional serration a, the pattern becomes monotonous, and the concealing effect of poor appearance and the visibility of the mark display portion are insufficient.

For this reason, in recent years, different serrations have been formed in both the decorative portion b and the mark display portion c, and
In at least one of the serrations, for example, FIG.
As conceptually shown in (A) and (B), the sparse portion e and the dense portion f are provided in the arrangement density of the ridges a1, or the inclination angle θ of the ridges a1 with respect to the tire radial direction is changed sequentially. Accordingly, it is desired to change the serration pattern and enhance the concealing effect of the appearance defect and the visibility of the mark display portion.

However, changing the arrangement density and the angle of the ridges a1 requires a great deal of labor for creating the program, because the program for the NC processing device for cutting the ridges a1 becomes complicated.

Therefore, in the present invention, at least one of the serrations provided in the decorative portion and the mark display portion is formed by a ridge extending on a radial line extending from the eccentric center displaced from the tire rotation center. Based on the configuration with the eccentric serration
It is an object of the present invention to provide a tire capable of changing both the arrangement density of ridges and the inclination angle while facilitating the program creation, thereby concealing the appearance defect and improving the visibility of the mark.

[0007]

In order to achieve the above object, the invention according to claim 1 of the present application provides a belt-shaped decorative portion extending in the tire circumferential direction on a surface of a sidewall of a tire, and at least a part of the decorative portion. A mark display part that is inside the section and displays a mark, the decoration part comprises a first serration in which a first ridge is juxtaposed, and the mark display part has a second ridge. The second serrations are arranged in parallel, and at least one of the first and second serrations is constituted by an eccentric serration formed by a ridge extending on a radial line extending from an eccentric center displaced from the tire rotation center. It is characterized by having done.

According to the invention of claim 2, the first serration and the second serration are both eccentric formed by ridges extending on radial lines extending from different eccentric centers displaced from the tire rotation center. It is characterized by being composed of serrations.

Further, in the invention of claim 3, the decorative portion and the mark display portion have their respective circumferential centers located on the same reference radial direction line, and the first serration and the second serration are combined. Each eccentric center is characterized by being located at an opposite position to the reference radial direction line.

Further, in the invention of claim 4, the eccentric center is
A distance L that is 20 to 80% of the distance R between the radial intermediate position of the eccentric serration and the tire rotation center,
It is characterized in that it is separated from the center of rotation of the tire in the radial direction.

Further, in the invention of claim 5, the distance L is 50 to 70% of the distance R.

Further, in the invention of claim 6, at least one of the decorative portion and the mark display portion is formed by a ridge extending on a radial line extending from a different eccentric center, so that the eccentric serration intersecting the ridges is formed. It is characterized by consisting of.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described together with the illustrated example. FIG. 1 is a side view showing a tire of the present invention. In FIG. 1, a tire 1 has a belt-shaped decoration portion 3 extending in the tire circumferential direction on a surface 2S of a sidewall 2 thereof, and a mark display portion 4 for displaying a mark at least a part of which is inside the decoration portion 3. And with. The decorative portion 3 is formed of the first serrations 6 in which the first ridges 5 are arranged in parallel, and the mark display portion 4 is formed in the second serrations 8 in which the second ridges 7 are arranged in parallel. Formed from.

Here, the first and second ridges 5 and 7
Is a small-width convex strip protruding from the surface 2S of the sidewall 2 with a small height. In this example, the apex angle α is about 90 ° and the apex surface is as shown in FIG. 2S
The case of a substantially trapezoidal shape cut along a plane substantially parallel to is illustrated. However, various conventional cross-sectional shapes can be adopted without being restricted by this, and the ridge 5,
As for the ridge height ha of 7, the conventional range of 0.2 to 0.8 mm can be preferably adopted, and further, the range of 0.3 to 0.4 mm is desirable. The first and second ridges 5 and 7 may have different cross-sectional shapes, ridge height ha, and the like.

Next, in this example, the decorative portion 3 is formed of an arcuate belt-shaped body extending concentrically with the tire in the tire circumferential direction, and is provided in a plurality of regions (two regions in this example) of the tire circumference. The case where it is formed is illustrated. However, as the decorative portion 3, as shown in FIG. 4 (A), it may be an annular shape that continuously extends over the entire circumference of the tire, or FIG. 4 (B).
As described above, the decorative portion 3 can be formed on a part of the circumference of the tire. Note that in FIG. 4, serrations of the mark display unit 4 are omitted for convenience sake.

The present invention is characterized in that at least one of the first and second serrations 6 and 8 is constituted by an eccentric serration 9.

In this example, as shown schematically in FIG. 2, both the first and second serrations 6 and 8 are constituted by eccentric serrations 9, but, for example, in FIG. As shown, either one can be configured by the non-eccentric serration 11. At this time, as shown in the figure, it is preferable to use the eccentric serration 9 for the decorative portion 3 on the background side in order to improve the visibility of the mark display portion 4.

Here, the non-eccentric serrations 11 are conventional serrations, for example, radial ridges 12 extending on a radial line extending from the tire rotation center O, or parallel to each other without a center. It is formed by an array of ridges (not shown).

On the other hand, the eccentric serration 9 of this embodiment is formed by the ridge 10 extending on the radial line J extending from the eccentric center C which is displaced from the tire rotation center O.

In such an eccentric serration 9, the arrangement density of the ridges 10 (may be referred to as ridge arrangement density) and the inclination angle θ of the ridges 10 with respect to the tire radial direction (may be referred to as ridge inclination angle θ). Both sides
It changes at the same time due to the displacement of the center C. As a result, the serration pattern can be greatly changed, and an excellent effect can be exerted in concealing the defective appearance and improving the visibility of the mark display portion 4. In particular, when both the decoration part 3 and the mark display part 4 are formed by the eccentric serrations 9, the serration pattern changes inside and outside the mark, so that it is possible to exert a superior effect by improving the visibility. .

Further, the eccentric serration 9 has an advantage that the groove width between the ridges increases and the mud-repelling property increases as the ridge arrangement density becomes sparse, so that the contamination of the serrations is easily removed. Also, due to the sparse and dense ridge arrangement density,
It can be expected to reduce the wear of the blade of the cutting tool of the NC processing device for cutting the ridge 10.

Here, it is preferable that the ridges 10 are formed at an equal angular pitch P from the eccentric center C. In such a case, the program for the NC machining apparatus is greatly simplified, so that the labor for creating the program can be reduced and the NC machining efficiency can be improved. Moreover, the radial line passing through the tire rotation center O and the eccentric center C is used as a reference J0, and as the distance from the reference J0 in the circumferential direction is increased, the ridge arrangement density is changed from dense to sparse, and the ridge inclination angle θ is changed from 0 °. They can be changed in a well-balanced manner, and the appearance of the serration pattern can be improved. The angle pitch P is not particularly limited,
The range of 0.2 to 1.5 ° is general, and the range of 0.2 to 0.
A range of 5 ° is desirable.

The radial distance L (shown in FIG. 1) of the eccentric center C from the tire rotation center O is the distance R between the radial intermediate position 9N of the eccentric serration 9 and the tire rotation center O. It is preferably 20 to 80%. If the distance L is less than 20% of the distance R, the degree of change in the ridge arrangement density and the ridge inclination angle θ is too small, and the concealing effect and the visibility improving effect are insufficient. On the other hand, if it exceeds 80%, the degree of change becomes excessive and the cutting process becomes difficult. From such a viewpoint, the distance L is more preferably 50 to 70% of the distance R.

Next, when both the decorative portion 3 and the mark display portion 4 are formed by the eccentric serrations 9 as in this example,
As shown in FIG. 2, it is important that the eccentric center CA of the eccentric serration 9A on the decorative portion 3 side and the eccentric center CB of the eccentric serration 9B on the mark display portion 4 side are arranged at mutually different positions.

At this time, in particular, the respective circumferential centers KA and KB of the decorative portion 3 and the mark display portion 4 are positioned on the same reference radial direction line, and the respective eccentric centers CA and CB.
Is preferably arranged at a position opposite to the reference radial direction line, particularly at a symmetrical position. In addition, the circumferential center KA, KB
Means the center of the circumferential length of the decorative portion 3 and the mark display portion 4. In this case, the ridges 10A and 10B are oriented so as to intersect with each other, and the ridges 10A and 10B are aligned.
For example, the arrangement density of B and the change of the inclination angle are opposite to each other, so that the serration pattern and its change can be mutually complemented, and the concealing effect and the effect of improving the visibility can be further enhanced. Eccentric serrations 9A and 9B
Then, the cross-sectional shape of each ridge 10A, 10B and the ridge height h
At least one of a and the angular pitch P may be different from each other.

In this example, as shown in FIG. 1, the two decorative parts 3,
Eccentricity center C of each eccentric serration 9A in FIG.
A is arranged at different positions from each other.
The change in the serration pattern can be further emphasized. That is, when the decorative portion 3 is formed in a plurality of regions within the circumference of the tire, the eccentric center CA of at least one decorative portion 3 in the plurality of regions is set to be the eccentric center of the other decorative portion 3. It is preferable that the position is different from that of CA.

FIG. 6 shows another example of the eccentric serration 9. In FIG. 6, the eccentric serrations 9 (one example of the eccentric serrations 9A on the decorative portion 3 side) arranged on one of the decoration portion 3 and the mark display portion 4 are different from the eccentric centers C1 and C2. Radial lines J1 and J2 extending respectively
By being formed by the ridges 10a and 10b extending upward, the ridges 10a and 10b are formed of intersecting eccentric serrations intersecting each other. At this time, the eccentric centers C1 and C2 are arranged at the line symmetrical positions with the center K in the circumferential direction of the decoration portion 3 or the mark display portion 4 as the center, and are arranged on the other side of the decoration portion 3 or the mark display portion 4. The serrations
The non-eccentric serration 11 (not shown in the figure) is preferable.

Although a particularly preferred embodiment of the present invention has been described above in detail, the present invention is not limited to the illustrated embodiment and can be modified into various modes.

[0029]

[Example] Based on the design of FIG. 1, a tire having a decorative portion with a mark display portion having the specifications of Table 1 formed on the sidewall surface was prototyped, and the mark display portion of each trial tire was visually confirmed. It was tested for sex and the results are listed in Table 1.

(1) Visibility of the mark display portion: Comparative Example 1 was evaluated by visual sensory evaluation of the visibility of the mark display portion.
It is indicated by an index of 00. The larger the value, the more noticeable and excellent the visibility.

[0031]

[Table 1]

[0032]

As described above, according to the present invention, at least one of the serrations provided in the decoration portion and the mark display portion is
Since it is composed of eccentric serrations formed by ridges extending on the radial line extending from the center of eccentricity, both the ridge arrangement density and the ridge inclination angle are changed at the same time while facilitating program creation to the NC processing device. It is possible to improve the concealment effect against appearance defects such as bulge and dent and the visibility of the mark.

[Brief description of drawings]

FIG. 1 is a side view of a tire according to an embodiment of the present invention.

FIG. 2 is a side view showing an enlarged decoration portion together with a mark display portion.

FIG. 3 is a cross-sectional view showing a ridge.

4A and 4B are schematic diagrams showing another example of a decorative portion.

FIG. 5 is a schematic view showing still another example of the decorative portion.

FIG. 6 is a schematic view showing another example of the eccentric serration portion.

FIG. 7 is a side view showing serrations in a conventional decorative portion.

FIG. 8 is a schematic view showing still another serration in the conventional decorative portion.

[Explanation of symbols]

2 sidewalls 2S surface 3 decoration 4 mark display 5 First Ridge 6 First Serration 7 Second Ridge 8 Second serration 9 Eccentric serration 10 Ridge C eccentric center J radial line O tire rotation center K circumferential center

Claims (6)

[Claims] 1. A tire-sidewall surface is provided with a belt-shaped decorative portion extending in a tire circumferential direction, and a mark display portion at least a part of which is in the decorative portion and displays a mark, the decorative portion Is composed of a first serration in which a first ridge is arranged in parallel, and the mark display part is composed of a second serration in which a second ridge is arranged in parallel. At least one of the tires is configured by an eccentric serration formed by a ridge extending on a radial line extending from an eccentric center displaced from the tire rotation center. 2. The first serration and the second serration are both composed of eccentric serrations formed by ridges extending on radial lines extending from different eccentric centers displaced from the tire rotation center. The tire according to claim 1, wherein: 3. The decorative portion and the mark display portion have their respective circumferential centers located on the same reference radial line, and the eccentric centers of the first serration and the second serration are the same. The tire according to claim 2, wherein the tire is located at a position opposite to the reference radial direction line. 4. The eccentric center is radially separated from the tire rotation center by a distance L that is 20 to 80% of a distance R between a radial intermediate position of the eccentric serration and the tire rotation center. The tire according to any one of claims 1 to 3, which is characterized by the above. 5. The distance L is 50 to 70% of the distance R.
The tire according to claim 4, wherein 6. At least one of the decoration portion and the mark display portion is formed by a ridge extending on a radial line extending from a different eccentric center, and thus is composed of eccentric serrations where the ridge intersects. Claim 1
The tire according to any one of to 5.