JP5394679B2 - Pneumatic tire - Google Patents

Description

  The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire in which the visibility of each individual display medium made of characters, symbols, etc., formed on the surface of at least one sidewall portion is improved.

  In order to improve the visibility of a display medium such as characters, figures, symbols, etc. displayed on the sidewall portion of the pneumatic tire, for example, the display medium is provided in the ridge decoration body of the sidewall portion as shown in FIGS. For example, as a result of using the ridge decoration body as a background by arranging the ridge decoration, the visibility of the display medium in the ridge decoration body has been widely increased.

  However, in general, this type of ridge decorative body is affected by light reflection according to the direction in which the ridge forming the ridge decorative body extends, and in the region where the side surface of the ridge faces the light incident direction. On the other hand, in the region where the extending direction of the ridge is the same as the incident direction of light, the side surface of the ridge becomes dark without reflecting light. 8 and 9, when light is incident, as shown in FIGS. 8 and 9, the difference in brightness between the two becomes too large. As a result, there is a problem that the visibility of the display medium in the ridge decoration is also lowered.

  Further, in order to enhance the visibility of the appearance of the tire, it is effective to produce a flat feeling. For example, as shown in FIG. 10, the ridges and valleys of the ridge of the ridge decorative body on the outer surface of the sidewall portion When a convex circumferential component is provided that is higher than each of the parts, the part tends to become the nucleus of the crack of the sidewall part by the input of the circumferential shear force accompanying the load rolling of the tire, There was a risk that the durability of the sidewall portion would be reduced.

  Therefore, the present invention improves the visibility of display media such as characters, figures, symbols and the like arranged on the sidewall portion, and can effectively suppress the occurrence of cracks in the sidewall portion. Provide tires.

The pneumatic tire according to the present invention includes a tread portion, a pair of sidewall portions that extend inward in the radial direction continuously to the respective side portions of the tread portion, and radially inward portions of the respective sidewall portions. A continuous bead portion, and an annular ridge decoration body having a constant width is provided on the outer surface of at least one sidewall portion, and a display medium is disposed in the ridge decoration body, and at least ridge decorative body region is disposed a display medium is made four or more rings ridge group adjacent to each other in the radial direction, mutually against each ridges radially segments of adjacent ridges group Na inclined in different directions is, the radial width of each ridge group equal to become mutually, each ridge group of the ridge, the inclination angle with respect to the tire radial direction line And it is characterized in that formed by each other equally.

  In such a tire, the display medium disposed in the ridge decoration body is more preferably positioned across a plurality of ridge groups.

  Here, the radial width is an industrial standard that is effective for the region where tires are produced and used. In Japan, JATMA (Japan Automobile Tire Association) YEAR BOOK, in Europe, ETRTO (European Tire and Rim Technical Organization). ) STANDARD MANUAL, in the United States TRA (THE TIRE and RIM ASSOCATION INC.) Under the condition that tires are assembled to rims specified in standards such as YEAR BOOK and filled with the highest air pressure in standards such as JATMA It shall mean the width in the radial direction.

  By the way, it is preferable that the ridges of the ridge groups adjacent to each other are continuously formed.

  Preferably, the ridge arrangement pitch of each ridge group is in the range of 0.5 to 3.0 mm.

  Preferably, an angle of each ridge group with respect to the tire radial direction of each ridge is set in a range of 20 to 70 °.

In the present invention, a ridge decorative body region is disposed at least a display medium, a ridge decorative body, mutually made four or more rings ridge group adjacent radially to each ridge of the adjacent ridge group By tilting in different directions relative to the tire radial direction line segment, the ridges of each ridge group extend in various directions with respect to the light incident direction, and the angle at which light is reflected mutually This makes it possible to reduce the difference in appearance light and darkness of the entire ridge decoration body, thereby improving the visibility of the entire ridge decoration body. As a result, since the ridge of this ridge group becomes the circumferential component of the sidewall portion, the visibility of the entire ridge decoration body can be improved without providing a circumferential component higher than the ridge height, for example, a convex circumferential component. Since the component that becomes the core of the crack is eliminated, the reduction in the durability of the sidewall portion can be suppressed.

  For example, when the ridge decorative body is formed of three ridge groups having the same radial width, the two ridge groups have the same inclination direction with respect to the tire radial direction. Therefore, there is a possibility that the visibility of the entire ridge decoration body may vary because the area ratio is about 2: 1 in many cases. However, as in the present invention, the ridges of each of the four or more ridge groups are inclined in mutually different directions with respect to the tire radial direction, thereby ensuring always excellent visibility as the entire ridge decoration body. can do.

Hereinafter, the pneumatic tire of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view showing an embodiment of the pneumatic tire of the present invention, FIG. 2 (a) is an enlarged side view of the main part of FIG. 1, and FIG. FIG. 2A is an enlarged end view taken along line AA in FIG. 2A, and FIG. 2C is an enlarged end view taken along line BB in FIG.

  In the figure, 1 is a tread portion, 2 is a pair of sidewall portions extending radially inward continuously to the respective side portions of the tread portion 1, and 3 is radially inward of the sidewall portion 2. Each bead portion to be shown is shown.

  In this tire, a ridge decoration body 4 is provided on the outer surface of one or both sidewall portions 2, and the ridge decoration body 4 has a radial width of, for example, 16.0 to 48.0 mm and has an outer surface. In the range of 15 to 30%, it forms an edge ring with a constant width as a whole.

In this pneumatic tire, at least the ridge decorative body 4 region in which the display medium 5 is disposed is composed of six annular ridge groups 6 adjacent to each other in the radial direction. The ridges 7 are inclined in different directions with respect to the tire radial line segment.
In this case, preferably, the radial widths of the respective ridge groups 6 are made equal to each other, and the inclination angles of the ridges 7 of the adjacent ridge groups 6 with respect to the tire radial direction line segment are made equal. In the figure, the ridges 7 are continuous with each other with a relative angle between the ridges of less than 90 °.

  In the illustrated tire, the ridge group 6 of the ridge decorative body 4 has a width in the range of 0.5 to 3.0 mm, for example, and the ridge 7 of the ridge group 6 is 20 to 70 ° with respect to the tire radial direction line segment. It inclines linearly within the range and protrudes 0.3 mm from a position recessed 0.4 mm from the outer surface of the sidewall portion. The ridge decorative body 4 is projected by 0.2 mm from the outer surface of the sidewall portion to form an edge portion 5a of the display medium 5, and the inside of the display medium 5 is arranged to be recessed 0.25 mm from the edge portion 5a. .

More preferably, in this pneumatic tire, the display medium 5 disposed in the ridge decorative body 4 is disposed across the plurality of ridge groups 6.
With this configuration, it is possible to arrange the display medium 5 on a background with a small difference in brightness due to the reflected light effectively dispersed in each ridge group 6, and as a result, the visibility of the display medium 5 is reduced. Can be suppressed.

  Preferably, by making the radial widths of the ridge groups 6 equal to each other, the reflected light with respect to the incident light can be effectively dispersed throughout the ridge decoration body 4 so as to reduce the brightness difference.

  Preferably, the ridges 7 have the same inclination angle with respect to the tire radial direction line segment between the ridge groups 6, so that any of the ridge groups 6 can be used regardless of the light incident direction. Since the ridge 7 reflects, it can reflect with respect to various directions of light, and visibility can be improved.

  It is also preferable that the ridges 7 of the ridge groups 6 adjacent to each other are continuous with each other, thereby reducing the number of man-hours for molding the tire vulcanization mold as compared with the case where the ridges are discontinuous.

  By the way, when the arrangement pitch of the ridges 7 in each ridge group 6 is in the range of 0.5 to 3.0 mm, the light reflected from the ridges 7 is concentrated to create a reflection surface. Thus, the brightness of the ridge group 6 can be effectively secured.

  That is, if it is less than 0.5 mm, the adjacent ridges 7 may interfere with each other at the bottom during molding. On the other hand, if it exceeds 3.0 mm, the distance between the ridges increases and light is effective. Cannot be reflected automatically, and the brightness tends to be inferior.

Preferably, when the angle of each ridge group 6 with respect to the tire radial direction of each ridge 7 is in the range of 20 to 70 °, incident light is reflected to effectively secure the brightness of the ridge group 6. can do.
Further, when the ridges 7 are continuously folded back with respect to the ridges 7 of the adjacent ridge groups 6, the adjacent ridge groups 6 can effectively determine whether or not they are reflected.

  That is, if the angle is less than 20 °, the angle range for reflecting incident light is small, and the difference in brightness with the adjacent ridge group 6 is inferior. On the other hand, if the angle exceeds 70 °, the reflection angle with the adjacent ridge group 6 Tends to be small and the difference in brightness of the ridge group 6 tends not to be maintained.

  1 and 2, the ridge decoration body 4 provided in the tire according to the present invention is composed of twelve annular ridge groups 6 as shown in FIG. Forming the ridge group 6 of the ridge decoration body 4 as shown in FIG. 4 in a spiral shape, and arranging it as a substantially triangular shape gradually narrowing from the outside in the radial direction to the inside, to enhance the decorativeness, As shown in FIG. 5, the ridge decoration body 4 can be formed of six ridge groups 6, and these ridge groups 6 can be formed of curved ridges 7.

Next, Example tires 1 to 3 having various structures as shown in Table 1 having a structure as shown in FIG.

  When the weather is fine (incident light angle of 45 to 135 °), the tire alone is rolled on the road surface, the visibility is evaluated by the viewer's feeling, and the results are shown in Table 2.

From the results of Table 2, the visibility of the example tires 1 to 3 was improved with respect to the comparative example tire.

It is a side view showing one embodiment of the pneumatic tire of the present invention. (A) is the principal part enlarged side view of FIG. 1, (b) is an enlarged end view which follows the AA line of (a), (c) is the BB line of (a). FIG. It is a principal part expanded side view which shows other embodiment of the pneumatic tire of this invention. (A) is an enlarged side view showing another embodiment of the air-filled tire, (b) are an enlarged end view taken along the line B-B of (a). It is a principal part expanded side view which shows other embodiment of the pneumatic tire of this invention. It is a principal part expanded side view which shows the conventional pneumatic tire. It is a principal part expanded side view which shows the conventional pneumatic tire. It is a side view which shows the case where light injects into the pneumatic tire of FIG. It is a side view which shows the case where light injects into the pneumatic tire of FIG. (A) is a principal part expanded side view which shows the conventional pneumatic tire, (b) is an expanded end view which follows a BB line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 3 Bead part 4 Ridge decoration 5 Display medium 5a Edge part 6 Ridge group 7 Ridge

Claims (5)

A tread portion; a pair of sidewall portions extending radially inward continuously to each side portion of the tread portion; and a bead portion continuing radially inward of each of these sidewall portions, In a pneumatic tire formed by providing a circular ridge decoration body having a constant width on the outer surface of one sidewall portion, and disposing a display medium in the ridge decoration body,
Ridge decorative body region is disposed at least a display medium are mutually made four or more rings ridge group adjacent radially cross each ridge adjacent ridge group with respect to the tire radial direction line Ri Na inclined in different directions to,
The radial width of each ridge group is equal to each other,
A pneumatic tire characterized in that the ridges of the respective ridge groups have equal inclination angles with respect to the tire radial line segment .   The pneumatic tire according to claim 1, wherein a display medium disposed in the ridge decoration body is positioned across a plurality of ridge groups. The pneumatic tire according to claim 1 or 2 , wherein the ridges of ridge groups adjacent to each other are continuous with each other . The pneumatic tire according to any one of claims 1 to 3, wherein a pitch of each ridge in each ridge group is in a range of 0.5 to 3.0 mm . The pneumatic tire according to any one of claims 1 to 4 , wherein an angle of each ridge group with respect to a tire radial direction of each ridge is in a range of 20 to 70 ° .