JPH05286316A - Wear indicator for tire - Google Patents

Abstract

PURPOSE:To make a tire nearing to a wear limit understood at first sight by forming a colored layer whose color excludes black color, at a predetermined depth position from the tread surface of a tire. CONSTITUTION:Plural tread grooves 3 are formed circumferentially at the tread surface 2 of a tire 1, and a colored layer 4 is formed at a predetermined depth position from the tread surface 2. Any color excepting black color will do for the colored layer 4. but red color, orange color. yellow color or the like that are striking comparatively, are desirable. The degree of depth (h) up to the colored layer 4 is made to be the same with that of wear depth at the time of the tire 1 being changed. When the tread surface 2 of the tire 1 wears up to the depth (h), the colored layer 4 appears on the tread surface 2, so it becomes very conspicuous with the black color that is the ground color of the tire 1 as a background color, and it can be clearly informed to a user that a tire exchange time has approached. Also, as the colored layer 4 is very conspicuous even if the tire 1 rotates, a third person at the following vehicle can also call the user's attention.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire wear indicator.

[0002]

2. Description of the Related Art In the tread groove of a tire, some shallow places are formed, and when the tire is worn out and approaches the limit, the shallow place becomes flush with the tread surface and the discontinuity (wear) occurs in the tread groove. A display device) is formed to inform the user that it is time to replace the tire.

[0003]

The conventional tire wear indicating device determines whether or not there is a discontinuity in the tread groove as described above. This discontinuity is relatively thin and the tire Since it does not extend all around, it is often overlooked unless the tire tread surface of a stationary tire is carefully observed.

[0004]

The present invention has been devised in order to effectively solve the above problems, and a color layer other than black is formed at a predetermined depth position from the tread surface of a tire. It is a thing.

[0005]

[Function] When the tire is worn by a predetermined amount, the color layer appears on the tread surface of the tire, and this color layer is very conspicuous in comparison with the ground color of the tire, which is black. You can easily know,
The color layer is well visible when seen by a third party outside the vehicle even while the vehicle is traveling, and thus can alert the driver.

[0006]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section of a tire 1 having a radial structure, and a tread surface 2 of the tire 1 is formed with a plurality of tread grooves 3 in the circumferential direction. A color layer 4 is formed at a predetermined depth from the tread surface 2 as shown in FIG. The color layer 4 may be any color as long as it is a color other than black, but red, orange, yellow and the like, which are relatively conspicuous, are desirable. The depth h to the color layer 4 is about the same as the wear depth of the tire 1 at the time of replacement. In the conventional wear display device, a shallow portion having a depth h is formed in the tread groove 3, but in the present invention, the color layer 4 is formed instead of this. The color layer 4 does not need to be formed over the entire circumference of the tire 1, and it is sufficient to form it in places as shown in FIG.

The wear indicating device for the tire 1 thus constructed has a color layer 4 which appears on the tread surface 2 as shown in FIG. 3 when the tread surface 2 of the tire 1 is worn to a depth h. It is very conspicuous with the black background color of 1 as the background color, and clearly informs the user that the tire replacement time is approaching. Further, since the color layer 4 is easily visible from the outside even when the tire 1 is rotating, it is possible for the driver of the following vehicle to call attention with a horn or the like.
In addition, wearing the tire 1 showing the color layer 4 poses a cosmetic problem, and as a result, there is an effect that the user can replace the tire without delay.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications can be made. For example, the color layer 4 may be formed around the tire 1 in an arbitrary pattern such as a zigzag pattern or a striped pattern,
Also, a color-coded pattern of two or more colors may be used. Further, the color layer may be formed of a plurality of layers having different colors so that, for example, a color layer of red appears after yellow.

[0010]

As described above, according to the present invention, since a color layer other than black is formed at a predetermined depth position from the tread surface of the tire, when the tire wears, the color layer is remarkably displayed on the tread surface. You can easily know that the time to replace is approaching. Also, since the color layer is noticeable even when the tire is rotating, it is possible for a third party of the following vehicle to call attention to the user, and therefore, the driver can drive without knowing that the tire has reached the wear limit while driving. Can be prevented from continuing.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of the tread surface.

FIG. 3 is a perspective view of the tire when the wear limit is approached.

[Explanation of symbols]

 1 tire 2 tread surface 3 tread groove 4 color layer

Claims (1)

[Claims] 1. A tire wear display device in which a color layer other than black is formed at a predetermined depth from the tread surface of the tire.