JP2016084044A - Pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make unevenness of a tire side part inconspicuous and to suppress a crack of the tire side part from extending in a peripheral direction.SOLUTION: A pair of main ridges 22A, 22B arranged mutually at intervals are formed at a decorative recessed part 18. Between the main ridges 22A, 22B, a narrow-interval ridge region 30 is formed of a plurality of sub-ridges 32 arranged mutually at intervals so as to connect the main ridges 22A and 22B together. A wide-interval ridge region 40 is formed of the plurality of sub-ridges 42.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pneumatic tire in which a plurality of ridges are formed on a tire side portion.

  2. Description of the Related Art Conventionally, a side decoration band formed by arranging a plurality of straight or curved ridges in parallel on a side portion of a tire has been widely used. In order to reduce the weight of the tire, the thickness of the tire side is reduced. However, when the thickness of the tire side is reduced, unevenness due to the end of a member such as a belt may appear on the surface of the tire side. In order to make such unevenness inconspicuous, the above-mentioned side decorative band is effective.

  For example, Patent Document 1 discloses a side decorative band composed of a decorative element A1, a decorative element B1, and a decorative element C1. By forming the side decoration band on the tire side portion, an effect of making the unevenness of the side portion of the tire inconspicuous can be obtained.

  By the way, if a crack occurs in the tire side portion, it tends to progress in the tire circumferential direction, and it is necessary to suppress the progress of such a crack.

JP 2011-126335 A

  In view of the above fact, an object of the present invention is to provide a pneumatic tire that makes the unevenness of the tire side portion inconspicuous and suppresses the progress of cracks in the tire side portion in the circumferential direction.

  The pneumatic tire according to claim 1 is provided with a decorative recess formed on the outer surface of the tire side portion and a bottom surface of the decorative recess that extends from the inner side to the outer side in the tire radial direction and is spaced from each other. A pair of main ridges that protrude from the bottom surface and are connected to one and the other of the pair of main ridges between the pair of main ridges, and are arranged in parallel at a distance from each other A narrow-spaced ridge region and a wide-spaced ridge region that are different from each other in the interval between the adjacent sub-bridges, and a space between the adjacent plurality of sub-bridges in the wide-spaced ridge region. A plurality of decorative elements wider than the interval between the plurality of adjacent sub-bridges in the narrow-spaced ridge region, wherein the plurality of decorative elements are mutually Apart from being placed.

  In the pneumatic tire according to claim 1, a plurality of decorative elements are arranged apart from each other in a decorative recess formed on the outer surface of the tire side portion. This decorative element is formed with a pair of main ridges that protrude from the bottom surface of the decorative recess and extend from the inner side to the outer side in the tire radial direction and are spaced from each other. A plurality of sub-bridges are formed so as to protrude from the bottom surface of the decorative recess and to connect one and the other of the pair of main ridges and are spaced from each other. A narrow-spaced ridge region and a wide-spaced ridge region are formed between the pair of main ridges, and the intervals between the adjacent sub-bridges are different from each other. The interval is wider than the interval between the plurality of sub-bridges in the interval ridge region.

  According to the pneumatic tire according to claim 1, since the plurality of decorative elements are arranged apart from each other, the pair of main ridges extending from the inner side to the outer side in the tire radial direction causes the tire circumferential direction. Since the continuous elements are divided, the progress of the cracks in the tire side portion in the circumferential direction can be suppressed. In addition, by providing areas where the intervals between the plurality of sub-bridges are different, it is possible to effectively produce a difference in shadow due to a difference in reflection of light (sunlight, ambient light, etc.), and to show the decorative element in a three-dimensional manner. It is possible to make the unevenness of the tire side portion inconspicuous.

  The pneumatic tire according to claim 2 is characterized in that an interval between the plurality of support bridges increases from one end side of the narrow interval ridge region toward the other end side of the wide interval ridge region.

  According to the pneumatic tire of the second aspect, in one decorative element, it is possible to produce a difference in shadow due to stepwise light reflection, and to improve the stereoscopic effect of the decorative element.

  In the pneumatic tire according to claim 3, in the decorative recess, the narrow interval ridge region is disposed on one end side in the tire radial direction, and the wide interval ridge region is disposed on the other end side in the tire radial direction. It is characterized by that.

  According to the pneumatic tire of the third aspect, since the difference in light reflection between the narrow interval ridge region and the wide interval ridge region in the decorative recess is arranged on one side and the other side in the tire radial direction, The difference in shadow can be effectively produced.

  In the pneumatic tire according to claim 4, a plurality of the decorative elements are arranged in the tire circumferential direction so that the adjacent narrow gap ridge areas and the wide gap ridge areas are alternately arranged in the tire circumferential direction. It is characterized by that.

  According to the pneumatic tire of the fourth aspect, the narrow interval ridge regions and the wide interval ridge regions are alternately arranged in the tire circumferential direction. It can be shown in three dimensions.

  The pneumatic tire according to claim 5 is characterized in that the pair of main ridges are inclined with respect to the tire radial direction.

  According to the pneumatic tire of the fifth aspect, the length of one decorative element can be increased in the decorative recess. Therefore, the portion with the shadow difference due to the difference in the reflection of light becomes longer, and the decorative element can be more effectively viewed in three dimensions.

  The pneumatic tire according to claim 6 is characterized in that the pair of main ridges are curved.

  According to the pneumatic tire of the sixth aspect, the length of one decorative element can be increased in the decorative recess. Also, the light reflection direction at the main ridge can be varied in multiple directions. Therefore, it is possible to lengthen the portion with the shadow difference due to the difference in the reflection of light and to change the shadow continuously, so that the decoration element can be more effectively viewed in three dimensions.

  The pneumatic tire according to a seventh aspect is characterized in that a width of the main ridge is wider than a width of the subbridge.

  According to the pneumatic tire of the seventh aspect, it is possible to produce a difference in shadow between the main ridge portion and the subbridge portion.

  The pneumatic tire according to an eighth aspect is characterized in that a protruding height of the main ridge from the bottom surface is higher than a protruding height of the surbridge from the bottom surface.

  According to the pneumatic tire of the eighth aspect, by making the height of the main ridge different from the height of the bridge, it is possible to produce a difference in shadow between the main ridge and the bridge.

  ADVANTAGE OF THE INVENTION According to this invention, while making the unevenness | corrugation of a tire side part inconspicuous, the progress to the circumferential direction of the crack of a tire side part can be suppressed.

It is a side view of the pneumatic tire concerning this embodiment of the present invention. It is a part of side decoration belt | band | zone of the pneumatic tire which concerns on this embodiment of this invention. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a part of side decoration belt concerning a modification of an embodiment of the present invention. It is a part of side decoration belt concerning other modifications of an embodiment of the present invention. It is a part of side decoration belt concerning other modifications of an embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of a pneumatic tire 10 according to the present embodiment. In the present embodiment, the tire circumferential direction is indicated by U, and the tire radial direction is indicated by R.

  The tire side portion 12 of the pneumatic tire 10 is formed with a mark portion 14 and a side decorative band 16 as a side decorative region.

  The mark portion 14 has a belt-like arc shape and is formed at two symmetrical positions with the tire center axis CE (see FIG. 1) in between. In the mark part 14, a mark 14A is arranged. The mark 14A is displayed by, for example, characters “ABCDEFGH” displayed on a smooth surface.

  The side decorative strips 16 are formed in an arc shape along the tire circumferential direction U, and are formed so as to be adjacent to both end portions of the mark portion 14.

  As shown in FIG. 2, a decorative recess 18 is formed in the side decorative band 16. The decorative recess 18 has a shape recessed from the outer surface of the tire side portion 12 and constitutes the outer shape of the side decorative band 16. A plurality of decorative elements 20 are arranged on the bottom surface 18 </ b> A of the decorative recess 18.

  One decorative element 20 includes a pair of main ridges 22A and 22B. As shown in FIG. 4, the pair of main ridges 22A, 22B protrude from the bottom surface 18A of the decorative recess 18 at a height H1, and the width is W1. The pair of main ridges 22 </ b> A and 22 </ b> B extend from the inner side to the outer side in the tire radial direction R and are inclined with respect to the tire radial direction R. The main ridge 22A and the main ridge 22B have a gently curved arc shape, and are arranged in parallel with an interval N1 as shown in FIG. The inclination angle of the main ridges 22A and 22B with respect to the tire radial direction R is preferably in the range of 40 degrees to 50 degrees.

  The height H1 is set within a range of 0.08 to 3.0 mm. Further, the width W1 is set within a range of 0.08 to 3.0 mm.

  A narrowly spaced ridge region 30 and a widely spaced ridge region 40 are formed between the pair of main ridges 22A and 22B. A plurality of sub-bridges 32 are formed in the narrowly spaced ridge region 30. A plurality of sub-bridges 42 are formed in the wide interval ridge region 40. The bridges 32 and 42 are arranged such that one end is connected to one main ridge 22A, the other end is connected to the other main ridge 22B, and the pair of main ridges 22A and 22B are connected. Further, the pair of main ridges 22A and 22B and the bridges 32 and 42 are arranged so as to form a substantially right angle. The height of protrusion of the bridges 32 and 42 from the bottom surface 18A is H2, and the width is W2. The protruding height H2 of the surbridges 32 and 42 is lower than the protruding height H1 of the main ridges 22A and 22B. Further, the width W2 of the bridges 32 and 42 is narrower than the width W1 of the main ridges 22A and 22B. The height H2 is set within a range of 0.05 to 2.0 mm. The width W2 is set within a range of 0.08 to 2.0 mm.

  As shown in FIG. 3, in the narrow spacing ridge region 30, the spacing between adjacent sub-bridges 32 is the narrowest on the side far from the wide spacing ridge region 40 and gradually increases toward the wide spacing ridge region 40. . Further, in the wide-spaced ridge region 40, the distance between adjacent sub-bridges 42 is narrowest on the side close to the narrow-spaced ridge region 30 and gradually increases toward the side farther from the narrow-spaced ridge region 30.

  As shown in FIG. 4, the distance M1 between the sub-bridge 42 and the sub-bridge 32 where the wide-spaced ridge region 40 and the narrow-space ridge region 30 are adjacent is closest to the wide-space ridge region 40 in the narrow-space ridge region 30. It is wider than the interval M2 between the adjacent support bridges 32. In addition, the interval M1 is narrower than the interval M3 between the sub-bridges 42 closest to the narrow-interval ridge region 30 in the wide-interval ridge region 40. As a result, in the decorative element 20, the intervals between the subbridges 32 and 42 are separated from one end side 34 of the narrow interval ridge region 30 (the end portion far from the wide interval ridge region 40) to the other of the wide interval ridge regions 40. The width becomes wider toward the end side 44 (the end portion on the side far from the narrow-spaced ridge region 30).

  As shown in FIG. 3, the decorative element 20 is arranged in parallel in the decorative recess 18 from the one end to the other end in the tire circumferential direction U with an interval N2. The interval N2 is smaller than the interval N1 between the pair of main ridges 22A and 22B. The decorative element 20 is alternately arranged in the tire circumferential direction U in which one end side 34 is arranged inside the tire radial direction R and in which the other end side 44 is arranged inside the tire radial direction R. Has been placed. Thereby, the narrow interval ridge regions 30 and the wide interval ridge regions 40 are alternately arranged in the tire circumferential direction U.

  As described above, the plurality of decorative elements 20 of the side decorative band 16 are arranged apart from each other. Therefore, since a pair of main ridges 22A and 22B extending from the inner side to the outer side in the tire radial direction divide elements that are continuous in the tire circumferential direction, the progress of cracks in the tire side portion in the circumferential direction is suppressed. can do. Further, by providing regions where the intervals between the plurality of sub-bridges 32 and 42 are different, it is possible to effectively produce a difference in shadow due to a difference in reflection of light (sunlight, ambient light, etc.), and to decorate the decorative element in three dimensions. Thus, the unevenness of the tire side portion 12 can be made inconspicuous.

 In the present embodiment, the interval between the adjacent bridges 32 and 42 of the decorative element 20 is widened from the one end side 34 toward the other end side 44. Therefore, it is possible to produce a difference in shadow due to stepwise light reflection, and to improve the stereoscopic effect of the decorative element 20.

  In the present embodiment, a plurality of adjacent narrow-spaced ridge regions 30 and wide-spaced ridge regions 40 are arranged in the tire circumferential direction so as to be alternately arranged in the tire circumferential direction U. Therefore, the side decoration band 16 can be more effectively viewed in three dimensions by using the difference in shadow between the narrowly spaced ridge region 30 and the widely spaced ridge region 40.

  In the present embodiment, the pair of main ridges 22A, 22B are inclined with respect to the tire radial direction R. Therefore, by increasing the length of one decoration element 20, the portion with the shadow difference due to the difference in the reflection of light becomes longer, and the decoration element 20 can be more effectively viewed in three dimensions. Note that the pair of main ridges 22A and 22B do not necessarily have to be inclined with respect to the tire radial direction R, and may extend in the tire radial direction R.

  In the present embodiment, the pair of main ridges 22A and 22B are curved. Therefore, it is possible to lengthen the portion with the shadow difference due to the difference in the reflection of light and to change the shadow continuously, so that the decoration element can be more effectively viewed in three dimensions. Note that the pair of main ridges 22A and 22B are not necessarily curved, and may be linear.

  In the present embodiment, the width W1 of the main ridges 22A and 22B is wider than the width W2 of the support bridges 32 and 42, and the protruding height H1 of the main ridges 22A and 22B from the bottom surface 18A is the bottom surface of the support bridges 32 and 42. It is higher than the protrusion height H2 from 18A. Therefore, the difference in shadow can be produced more effectively due to the difference in height and width.

  In the present embodiment, the interval between the adjacent sub-bridges 32 and 42 is changed in each of the narrow interval ridge region 30 and the wide interval ridge region 40. However, it is not always necessary to change the interval. As shown in FIG. 5, the decorative element 21 may be a narrow-spaced ridge region 31 in which the intervals between the bridges 32 are equally spaced M3 and a wide-spaced ridge region 41 in which the intervals between the bridges 42 are equally spaced M4. In this case, M3 <M4.

  Further, in the present embodiment, the narrow spacing ridge region 30 and the wide spacing ridge region 40 are formed one by one in one decorative element 20, but as shown in FIG. A plurality of interval ridge regions 30 and wide interval ridge regions 40 may be formed. In FIG. 6, in one decorative element 23, two narrow gap ridge areas 30 and two wide gap ridge areas 40 are formed. Moreover, as shown in FIG. 7, it is good also as the decoration element 25 which has arrange | positioned the wide space | interval ridge area | region 40 in the center of the tire radial direction R, and has arrange | positioned the narrow space | interval ridge area | region 30 on the both sides.

DESCRIPTION OF SYMBOLS 10 Pneumatic tire 12 Tire side part 16 Side decoration band (side decoration area)
18 Decorative recess 18A Bottom surface 20, 21, 23, 25 Decorative elements 22A, 22B Main ridges 30, 31 Narrowly spaced ridge regions 32, 42 Subbridges 40, 42 Widely spaced ridge regions R Tire radial direction U Tire circumferential direction

Claims (8)

A decorative recess formed on the outer surface of the tire side portion;
A pair of main ridges projecting from the bottom surface of the decorative recess and extending from the inner side to the outer side in the tire radial direction and arranged in parallel with a distance from each other, and projecting from the bottom surface between the pair of main ridges And a plurality of sub-bridges formed so as to connect one of the pair of main ridges to each other and spaced apart from each other, and the intervals between the adjacent sub-bridges are different from each other. A plurality of decorative elements, each having a ridge region and a wide interval ridge region, wherein a distance between the plurality of adjacent subbridges in the wide interval ridge region is wider than an interval between the plurality of adjacent subbridges in the narrow interval ridge region; ,
A pneumatic tire, wherein the plurality of decorative elements are spaced apart from each other.   2. The pneumatic tire according to claim 1, wherein an interval between the plurality of sub-bridges increases from one end side of the narrow interval ridge region toward the other end side of the wide interval ridge region.   2. The decorative recess, wherein the narrow-spaced ridge region is disposed on one end side in the tire radial direction and the wide-spaced ridge region is disposed on the other end side in the tire radial direction. Alternatively, the pneumatic tire according to claim 2.   The plurality of decorative elements are arranged in the tire circumferential direction such that the adjacent narrow-spaced ridge regions and wide-spaced ridge regions are alternately arranged in the tire circumferential direction. The pneumatic tire of any one of -3.   The pneumatic tire according to any one of claims 1 to 4, wherein the main ridge is inclined with respect to a tire radial direction.   The pneumatic tire according to claim 1, wherein the main ridge is curved.   The pneumatic tire according to claim 1, wherein a width of the main ridge is wider than a width of the subbridge.   The pneumatic tire according to claim 1, wherein a protruding height of the main ridge from the bottom surface is higher than a protruding height of the subbridge from the bottom surface.