JPH0613904U - Pneumatic tire - Google Patents

Abstract

(57) [Abstract] [Purpose] In the buttress pattern of a pneumatic tire, the shadow effect and highlight effect of decorative recesses such as shallow grooves can be enhanced, and a visual effect with a three-dimensional effect can be achieved. To do so. [Structure] In the buttress portion 5 extending from the shoulder portion 3 of the tire T to approximately the center of the side portion 4, the bottom surface of the recess 10 such as a shallow groove in the buttress pattern continuous from the tread pattern is formed into a relatively fine uneven surface 11. Form and develop a shadow effect.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pneumatic tire having a buttress pattern that is continuous from a tread pattern in a buttress portion that extends from the shoulder portion to approximately the center of the side portion.

[0002]

[Prior art]

 Generally, the outer peripheral surface of the tread portion (1) of the tire (T) is patterned with circumferential grooves (2), widthwise grooves, slits or blocks as shown in FIGS. 6 and 7. A groove having continuous tread pattern, that is, a so-called buttress portion (5) extending from the shoulder portion (3) at both ends of the tread portion (1) to the approximate center of the side portion (4). It has a pattern (butless pattern) formed by (2a) and the block (7). This buttress pattern usually terminates at or near the side decoration line (6).

In particular, for the purpose of enhancing the design effect of the buttress pattern as shown in FIG. 7, a decorative recess (8) such as a shallow groove is formed in a portion in the block (7) of the buttress pattern to design the design. It is also done.

[0004]

[Problems to be solved by the device]

 However, the design of the buttress pattern described above, even if the concave portion (8) for decoration is formed as described above, still gives a visually very simple impression compared to the tread portion (1). , There is a lack of design effect.

That is, the buttress portion (5) of the tire has a relatively small wall thickness and is likely to be subjected to stress concentration due to bending of the tire, which causes failure factors such as groove cracks and torque cracks. Since it is easy, the recessed portion (8) such as the groove has to be relatively shallow, and therefore, the shadow effect and highlight effect due to the recessed portion (8) are lacking, resulting in poor stereoscopic effect. It will be.

The present invention has been made in view of the above, and enhances a shadow effect and a highlight effect due to a decorative recess such as a shallow groove in a buttress pattern that cannot be deepened in view of maintaining tire performance. It is intended to provide a pneumatic tire having a three-dimensional visual effect and exhibiting an excellent design effect.

[0007]

[Means for Solving the Problems]

 In the pneumatic tire of the present invention which solves the above problems, in the buttress portion from the shoulder portion of the tire to the substantial center of the side portion, the recessed bottom surface such as the shallow groove in the buttress pattern continuous from the tread pattern is relatively fine. It is characterized in that it is formed on a rough surface.

[0008]

[Action]

 In the case of the tire having the above structure, since the bottom surface of the recess such as a shallow groove in the buttress pattern is formed into a fine uneven surface, even if the recess is relatively shallow, the shadow effect is exhibited due to the diffuse reflection of the bottom surface. As a result, the contrast of the convex surface around it becomes clear, and therefore the depth of the concave is emphasized, which increases the visual stereoscopic effect.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIGS.

FIGS. 1 and 2 show an example in which the present invention is implemented in a buttress pattern of a tire (T) similar to FIGS. 6 and 7.

In this embodiment, the buttress portion (5) extending from the shoulder portions (3) at both ends of the tread portion (1) to the substantial center of the side portion (4) has an uneven pattern, that is, a groove continuous from the tread pattern. In the block (7), which is the convex portion of the buttress pattern formed by (2a) and the block (7), a decorative concave portion (10) such as a shallow groove is provided, and the bottom surface of the concave portion (10) is It is formed on a relatively fine uneven surface (11) by graining. FIG. 3 shows an enlarged cross section of the bottom of the recess (10).

In order to form the fine uneven surface (11), for example, processing by knurling or etching and various other processing means capable of forming a fine uneven surface can be used. In addition to the ridges and grooves in the direction, fine protrusions and minute recesses may be scattered on a satin-finished strip, or a rough surface with ridges and valleys may be used.

Then, in the finishing step after vulcanization of the tire, it is possible to form a fine uneven surface on the bottom surface of the recessed portion (10) by the above-mentioned means, or to form a surface corresponding to the bottom surface of the recessed portion of the vulcanizing mold. It is also possible to form fine irregularities by the same means and make the bottom surface of the concave portion of the tire to be vulcanized into fine irregularities.

The shape of the decorative recess (10) in the buttress pattern is not limited to those shown in FIGS. 1 and 2, and various groove shapes such as the groove shapes illustrated in FIGS. 4 and 5 are conceivable. . In some cases, a decorative recess other than the groove may be formed in the block (7), and in this case as well, the bottom surface of the recess may be formed into a fine uneven surface.

As described above, when the bottom surface of the recess (10) such as a groove in the buttress pattern is formed with a fine uneven rough surface (11), even if the recess (10) is relatively shallow. Due to the irregular reflection by the uneven surface (11), light is reflected compared to other surfaces and becomes unpleasant, and a shadow effect is exhibited, and the contrast with the surrounding block (7) surface and the like becomes clear. The depth of (10) is emphasized, the visual three-dimensional effect is increased, and an excellent decorative effect can be exhibited.

Further, regarding the groove (2a) continuing from the tread pattern portion, by forming the bottom surface of the shallow portion into a fine uneven surface, the design effect of this buttress pattern can be further enhanced. it can.

[0017]

[Effect of device]

 As described above, according to the present invention, in a buttress pattern that cannot be deepened in order to maintain tire performance, the bottom surface of a recess for decoration such as a shallow groove is formed into a relatively fine uneven surface. The shadow effect and highlight effect can enhance the visual three-dimensional effect of the pattern, exhibit an excellent design effect, and improve the pattern design of this portion.

[Brief description of drawings]

FIG. 1 is a perspective view of a part of a tire showing an embodiment of the present invention.

FIG. 2 is an enlarged front view of one block of a buttress pattern.

FIG. 3 is an enlarged cross-sectional view of a bottom surface portion of a concave portion formed by an uneven surface.

FIG. 4 is an enlarged front view of one block illustrating another buttress pattern.

FIG. 5 is an enlarged front view of one block illustrating still another buttress pattern.

FIG. 6 is a schematic cross-sectional view of a general tire.

FIG. 7 is a side view of a portion of the same tire.

[Explanation of symbols]

 (T) Tire (1) Tread part (2) Groove (3) Shoulder part (4) Side part (5) Buttress part (7) Block (10) Decorative concave part (11) Fine uneven surface

Claims (1)

[Scope of utility model registration request] 1. A bottom surface of a buttress portion extending from a shoulder portion of a tire to a substantial center of a side portion, wherein a bottom surface of a recess such as a shallow groove in a buttress pattern continuous from a tread pattern is formed into a relatively fine uneven surface. Pneumatic tire characterized by.