JP2021091364A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2021091364A
JP2021091364A JP2019224676A JP2019224676A JP2021091364A JP 2021091364 A JP2021091364 A JP 2021091364A JP 2019224676 A JP2019224676 A JP 2019224676A JP 2019224676 A JP2019224676 A JP 2019224676A JP 2021091364 A JP2021091364 A JP 2021091364A
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tire
region
radial direction
serration
serrations
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JP7339875B2 (en
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由彦 橋本
Yoshihiko Hashimoto
由彦 橋本
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
Toyo Tire Corp
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Abstract

To provide a pneumatic tire configured so that aesthetic appearance in a tire side part can be improved while making a serration part formed in the tire side part prevent irregularities of the tire side part from becoming conspicuous.SOLUTION: A pneumatic tire 1 comprises at a tire side part 5 a serration part 7 extending in a circular arc shape. The serration part 7 has: a first region 10 in which a plurality of first serrations 11 are formed; a second region 20, arranged adjacent to outside in a tire radial direction with respect to the first region 10, in which a plurality of second serrations 21 are formed; and a third region 30, arranged adjacent to outside in the tire radial direction with respect to the second region 20, in which a plurality of third serrations 31 are formed. The first serrations 11 and the third serrations 31 bend and extend. The second serrations 21 extend linearly.SELECTED DRAWING: Figure 2

Description

本発明は、空気入りタイヤに関する。 The present invention relates to a pneumatic tire.

空気入りタイヤは、様々な帯状タイヤ構成部材を成形ドラムの周部に円環状に巻回してトロイダル状に膨張させてグリーンタイヤを形成し、これを加硫成形することで形成される。加硫成形後のタイヤサイド部には、帯状タイヤ構成部材の、巻き始め部と巻き終わり部とを接合する、ジョイント部が、局部的に凹凸面となって表れやすく、この凹凸面がタイヤの外観品質を低下させる原因となっていた。 Pneumatic tires are formed by winding various strip-shaped tire components around a molding drum in an annular shape and expanding them in a toroidal shape to form a green tire, which is then vulcanized and molded. On the tire side portion after vulcanization molding, the joint portion of the strip-shaped tire component member that joins the winding start portion and the winding end portion tends to appear as a locally uneven surface, and this uneven surface is likely to appear on the tire. It was a cause of deterioration in appearance quality.

従来、このような局部的な凹凸面を目立ち難くするために、タイヤサイド部に多数のリッジよりなるセレーション部を設けることが知られている（特許文献１，２）。 Conventionally, in order to make such a locally uneven surface less noticeable, it is known that a serration portion composed of a large number of ridges is provided on the tire side portion (Patent Documents 1 and 2).

特開２０１２−１８８３０７号公報Japanese Unexamined Patent Publication No. 2012-188307 特開２０１３−０３５３１３号公報Japanese Unexamined Patent Publication No. 2013-035313

特許文献１，２のセレーション部は、タイヤサイド部の凹凸を目立ち難くすることを意図しており、セレーション部の形成によりタイヤサイド部の美観性を高める点でさらに改良する余地がある。 The serration portions of Patent Documents 1 and 2 are intended to make the unevenness of the tire side portion less noticeable, and there is room for further improvement in terms of enhancing the aesthetic appearance of the tire side portion by forming the serration portion.

本発明は、タイヤサイド部に形成したセレーション部によって、タイヤサイド部の凹凸を目立ち難くしながら、タイヤサイド部における美観性を高めることができる空気入りタイヤを提供することを課題とする。 An object of the present invention is to provide a pneumatic tire capable of enhancing the aesthetic appearance of the tire side portion while making the unevenness of the tire side portion less noticeable by the serration portion formed on the tire side portion.

本発明は、
タイヤサイド部に、円弧状に延びるセレーション部を備え、
前記セレーション部は、
複数の第１セレーションが形成された、第１領域と、
前記第１領域に対してタイヤ径方向の外側に隣接しており、複数の第２セレーションが形成された、第２領域と、
前記第２領域に対してタイヤ径方向外側に隣接しており、複数の第３セレーションが形成された、第３領域と
を有し、
前記第１セレーションおよび前記第３セレーションは、屈曲して延びており、
前記第２セレーションは、直線状に延びている空気入りタイヤを提供する。 The present invention
The tire side part is equipped with a serration part that extends in an arc shape.
The serration part
A first region in which a plurality of first serrations are formed,
A second region, which is adjacent to the outer side in the tire radial direction with respect to the first region and in which a plurality of second serrations are formed,
It has a third region adjacent to the second region on the outer side in the tire radial direction and in which a plurality of third serrations are formed.
The first serration and the third serration are bent and extended.
The second serration provides a pneumatic tire that extends linearly.

本発明によれば、第１領域および第３領域には屈曲して延びる第１セレーションおよび第３セレーションが形成されているので、直線状に延びる第２セレーションが形成された第２領域に比して、光の乱反射が生じにくい。 According to the present invention, since the first serrations and the third serrations extending by bending are formed in the first region and the third region, the ratio is compared with the second region in which the second serration extending linearly is formed. Therefore, diffused reflection of light is unlikely to occur.

この結果、第１領域および第３領域がタイヤ色である黒色がより濃く見えやすく、第１領域および第３領域に比して乱反射が生じやすい第２領域を明るく見えやすくして目立たせることができる。したがって、セレーション部によってタイヤサイド部の凹凸を目立ち難くしつつ、セレーション部に黒色の濃淡をつけやすくタイヤサイド部における美観性を高めやすい。 As a result, black, which is the tire color of the first region and the third region, is more likely to appear darker, and the second region, which is more likely to cause diffuse reflection than the first region and the third region, can be made bright and conspicuous. it can. Therefore, it is easy to add shades of black to the serrations while making the unevenness of the tire side less noticeable by the serrations, and it is easy to enhance the aesthetic appearance of the tire side.

前記第２領域は、前記セレーション部のうち、タイヤ周方向の一端部側におけるタイヤ径方向の内径側端部から、タイヤ周方向の他端部側におけるタイヤ径方向の外径側端部まで、タイヤ周方向の他端部側に向かってタイヤ径方向の外側に傾斜した方向に延びていてもよい。 The second region extends from the inner diameter side end portion in the tire radial direction on the one end side in the tire circumferential direction to the outer radial side end portion in the tire radial direction on the other end side in the tire circumferential direction. It may extend in a direction inclined outward in the tire radial direction toward the other end side in the tire circumferential direction.

直線状のセレーションが形成されている第２領域は、屈曲したセレーションが形成されている第１領域および第３領域に比してタイヤサイド部の面剛性を高めにくい。このため、接地時における、タイヤサイド部のタイヤ幅方向への膨出変形にかかる曲げ稜線は、相対的に面剛性が低い第２領域に集中しやすい。 In the second region where the linear serrations are formed, it is difficult to increase the surface rigidity of the tire side portion as compared with the first region and the third region where the bent serrations are formed. Therefore, the bent ridge line that is subjected to the bulging deformation of the tire side portion in the tire width direction at the time of touchdown tends to be concentrated in the second region where the surface rigidity is relatively low.

しかしながら、本構成によれば、第２領域は、タイヤ周方向に向かってタイヤ周方向に傾斜しているので、タイヤサイド部の上記曲げ稜線を第２領域に沿ってタイヤ周方向に対して傾斜させやすい。これによって、タイヤサイド部の曲げ稜線が同一径方向位置に集中する場合に比して、タイヤサイド部の曲げ変形を抑制することができる。よって、第２領域に直線状のセレーションを形成しつつも、タイヤサイド部の剛性低下が抑制される。 However, according to this configuration, since the second region is inclined in the tire circumferential direction toward the tire circumferential direction, the bent ridge line of the tire side portion is inclined with respect to the tire circumferential direction along the second region. Easy to make. As a result, bending deformation of the tire side portion can be suppressed as compared with the case where the bending ridge lines of the tire side portion are concentrated in the same radial position. Therefore, while forming linear serrations in the second region, a decrease in rigidity of the tire side portion is suppressed.

前記第２領域は、前記第１領域と前記第３領域とにタイヤ径方向に挟まれた部分のうち、タイヤ径方向の中央部がタイヤ径方向に狭く、前記中央部からタイヤ周方向の両側に向かってタイヤ径方向に拡がっていてもよい。 In the second region, of the portions sandwiched between the first region and the third region in the tire radial direction, the central portion in the tire radial direction is narrow in the tire radial direction, and both sides from the central portion in the tire circumferential direction. It may spread in the tire radial direction toward.

本構成によれば、第２領域のうち、タイヤ径方向の中央部に位置しているために面剛性が低下しやすい中央部を、タイヤ径方向に小さく構成することによって、中央部における面剛性の低下を抑制しやすい。よって、タイヤサイド部の剛性低下がさらに抑制される。一方、第２領域のうち中央部からタイヤ周方向の両側に離れた部分は、中央部に比してタイヤ径方向の両側に位置しているので面剛性が低下しにくく、タイヤ径方向に大きく構成することによって美観性を高めやすい。 According to this configuration, in the second region, the central portion where the surface rigidity tends to decrease because it is located in the central portion in the tire radial direction is made smaller in the tire radial direction, whereby the surface rigidity in the central portion is formed. It is easy to suppress the decrease of. Therefore, the decrease in rigidity of the tire side portion is further suppressed. On the other hand, in the second region, the portions separated from the central portion on both sides in the tire circumferential direction are located on both sides in the tire radial direction as compared with the central portion, so that the surface rigidity is less likely to decrease and is large in the tire radial direction. It is easy to enhance the aesthetics by configuring it.

前記複数の第２セレーションは、タイヤ径方向に直線状に延びていてもよい。 The plurality of second serrations may extend linearly in the tire radial direction.

本構成によれば、第２セレーションはタイヤ径方向に直線状に延びているので、第２領域のタイヤ径方向における剛性を高めやすい。よって、タイヤサイド部のタイヤ径方向における剛性低下がさらに抑制される。 According to this configuration, since the second serration extends linearly in the tire radial direction, it is easy to increase the rigidity of the second region in the tire radial direction. Therefore, the decrease in rigidity of the tire side portion in the tire radial direction is further suppressed.

前記複数の第１セレーションおよび前記複数の第３セレーションは、前記第２セレーションの延在方向に直交する方向に延びており、前記第２セレーションの延在方向に振幅を有していてもよい。 The plurality of first serrations and the plurality of third serrations extend in a direction orthogonal to the extending direction of the second serration, and may have an amplitude in the extending direction of the second serration.

本構成によれば、第１領域および第３領域には、屈曲した第１セレーションおよび第３セレーションが形成されているので、面剛性が高くなりやすいが、第１セレーションおよび第３セレーションタイヤは、径方向と直交する方向に形成されている。これによって、第１領域および第３領域のタイヤ径方向における曲げ剛性が過度に高くなることが抑制され、第２領域へのタイヤサイド部の曲げ稜線の集中を緩和しやすい。よって、タイヤサイド部の剛性低下がさらに抑制される。 According to this configuration, since the bent first serrations and third serrations are formed in the first region and the third region, the surface rigidity tends to be high, but the first serrations and the third serration tires have It is formed in a direction orthogonal to the radial direction. As a result, it is possible to prevent the bending rigidity in the tire radial direction of the first region and the third region from becoming excessively high, and it is easy to alleviate the concentration of the bending ridge line of the tire side portion in the second region. Therefore, the decrease in rigidity of the tire side portion is further suppressed.

本発明によれば、タイヤサイド部に形成したセレーション部によって、タイヤサイド部の凹凸を目立ち難くしながら、タイヤサイド部における美観性を高めることができる。 According to the present invention, the serration portion formed on the tire side portion makes it possible to enhance the aesthetic appearance of the tire side portion while making the unevenness of the tire side portion inconspicuous.

本発明の一実施形態に係る空気入りタイヤのタイヤサイド部を示す側面図。The side view which shows the tire side part of the pneumatic tire which concerns on one Embodiment of this invention. 図１のＸ部を拡大して示す拡大図。An enlarged view showing the X part of FIG. 1 in an enlarged manner. 図２のIII−III線に沿った断面図。FIG. 2 is a cross-sectional view taken along the line III-III of FIG.

以下、本発明に係る実施形態を添付図面に従って説明する。なお、以下の説明は、本質的に例示に過ぎず、本発明、その適用物、あるいは、その用途を制限することを意図するものではない。また、図面は模式的なものであり、各寸法の比率等は現実のものとは相違している。 Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. It should be noted that the following description is essentially merely an example and is not intended to limit the present invention, its application, or its use. In addition, the drawings are schematic, and the ratio of each dimension is different from the actual one.

図１は、本発明の一実施形態に係る空気入りタイヤ１の側面図である。図１に示すように、空気入りタイヤ１は、タイヤ径方向の外径側に位置するトレッド部２と、タイヤ径方向の内径側に位置するビード部３と、トレッド部２とビード部３とのタイヤ径方向間に位置するタイヤサイド部５と、を有している。タイヤサイド部５には、円弧状に延びるセレーション部７が形成されている。 FIG. 1 is a side view of a pneumatic tire 1 according to an embodiment of the present invention. As shown in FIG. 1, the pneumatic tire 1 includes a tread portion 2 located on the outer diameter side in the tire radial direction, a bead portion 3 located on the inner diameter side in the tire radial direction, and a tread portion 2 and a bead portion 3. It has a tire side portion 5 located between the tires in the radial direction of the tire. A serration portion 7 extending in an arc shape is formed on the tire side portion 5.

セレーション部７は、タイヤサイド部５の周方向において１８０度対向する位置に、２つ形成されている。それぞれのセレーション部７は、タイヤサイド部５のタイヤ周方向における１／４の範囲において形成されている。タイヤサイド部５における２つのセレーション部７のタイヤ周方向間に標章（例えば製品名、ブランド名）を表示させてもよい。 Two serration portions 7 are formed at positions facing each other by 180 degrees in the circumferential direction of the tire side portion 5. Each serration portion 7 is formed in a range of 1/4 of the tire side portion 5 in the tire circumferential direction. A mark (for example, a product name or a brand name) may be displayed between the tire circumferential directions of the two serration portions 7 on the tire side portion 5.

図２は、セレーション部７の１つを拡大して示している。図２において、タイヤ周方向における時計回り（右側）を第１周方向Ｒと称し、タイヤ周方向における反時計回り（左側）を第２周方向Ｌと称する。 FIG. 2 shows one of the serration units 7 in an enlarged manner. In FIG. 2, the clockwise direction (right side) in the tire circumferential direction is referred to as the first circumferential direction R, and the counterclockwise direction (left side) in the tire circumferential direction is referred to as the second circumferential direction L.

セレーション部７は、タイヤ径方向において、内径側端部に位置する内径側縁部７１と、外径側端部に位置する外径側縁部７２と、これらの第１周方向Ｒの端点Ａ，Ｂをタイヤ径方向に接続する第１径方向縁部７３と、これらの第２周方向Ｌの端点Ｃ，Ｄをタイヤ径方向に接続する第２径方向縁部７４とによって円弧状領域に区画されている。内径側縁部７１および外径側縁部７２は、空気入りタイヤの回転中心線Ｏ１（図１参照）を中心とする同芯の円弧である。 In the tire radial direction, the serration portion 7 includes an inner diameter side edge portion 71 located at the inner diameter side end portion, an outer diameter side edge portion 72 located at the outer diameter side end portion, and an end point A of these in the first circumferential direction R. , B is connected in the tire radial direction by the first radial edge portion 73, and the end points C and D in the second circumferential direction L are connected in the tire radial direction by the second radial edge portion 74 in the arcuate region. It is partitioned. The inner diameter side edge portion 71 and the outer diameter side edge portion 72 are concentric arcs centered on the rotation center line O1 (see FIG. 1) of the pneumatic tire.

第１径方向縁部７３および第２径方向縁部７４は、タイヤ径方向の外径側に向かって第１周方向Ｒへ傾斜した方向に直線状に延びている。第１径方向縁部７３および第２径方向縁部７４は、互いに直交した方向に延びる位置関係にある。 The first radial edge portion 73 and the second radial edge portion 74 extend linearly in a direction inclined in the first circumferential direction R toward the outer diameter side in the tire radial direction. The first radial edge portion 73 and the second radial edge portion 74 are in a positional relationship extending in directions orthogonal to each other.

セレーション部７は、複数の第１セレーション１１が形成された第１領域１０と、第１領域１０に対してタイヤ径方向の外側に隣接しており複数の第２セレーション２１が形成された第２領域２０と、第２領域２０に対してタイヤ径方向の外側に隣接しており複数の第３セレーション３１が形成され第３領域３０とを有している。 The serration portion 7 has a first region 10 in which a plurality of first serrations 11 are formed, and a second region 10 adjacent to the outer side in the tire radial direction with respect to the first region 10 and in which a plurality of second serrations 21 are formed. The region 20 and the second region 20 are adjacent to the outer side in the tire radial direction, and a plurality of third serrations 31 are formed to have a third region 30.

第１領域１０は、内径側縁部７１上の点Ｅと点Ａとを結ぶ円弧状の線分ＥＡと、点Ｅと外径側縁部７２上の点Ｆとを結ぶ円弧状の線分ＥＦと、第１径方向縁部７３と、点Ｆと点Ｂとを結ぶ円弧状の線分ＦＢとによって囲まれた領域である。内径側縁部７１のタイヤ周方向における長さをＸ１としたとき、点Ｅは、点Ｃから内径側縁部７１上に沿って１／４Ｘ１の長さ第１周方向Ｒに離れている。点Ｆは、点Ｂの第２周方向Ｌの近傍に位置している。 The first region 10 is an arc-shaped line segment EA connecting the points E and A on the inner diameter side edge 71 and an arc-shaped line segment connecting the point E and the point F on the outer diameter side edge 72. This is a region surrounded by the EF, the first radial edge portion 73, and the arc-shaped line segment FB connecting the points F and B. Assuming that the length of the inner diameter side edge portion 71 in the tire circumferential direction is X1, the point E is separated from the point C along the inner diameter side edge portion 71 by a length of 1/4 X1 in the first circumferential direction R. The point F is located in the vicinity of the second circumferential direction L of the point B.

線分ＥＡは、内径側縁部７１上を延びている。線分ＥＦは、第１周方向Ｒに向かって、徐々にタイヤ径方向の外側に傾斜した方向に延びて線分ＥＡに対するタイヤ径方向における距離が次第に増大している。線分ＥＦは、第１周方向Ｒに向かって曲率半径が次第に大きくなる円弧状に形成されている。第１領域１０は、第１周方向Ｒに向かって次第にタイヤ径方向における長さが増大している。 The line segment EA extends on the inner diameter side edge portion 71. The line segment EF gradually extends in a direction inclined outward in the tire radial direction toward the first circumferential direction R, and the distance in the tire radial direction with respect to the line segment EA gradually increases. The line segment EF is formed in an arc shape in which the radius of curvature gradually increases toward the first circumferential direction R. The length of the first region 10 gradually increases in the tire radial direction toward the first circumferential direction R.

第２領域２０は、点Ｃと点Ｅとを結ぶ円弧状の線分ＣＥと、点Ｃと外径側縁部７２上の点Ｇとを結ぶ円弧状の線分ＣＧと、線分ＥＦと、点Ｇと点Ｆとを結ぶ円弧状の線分ＧＦとによって囲まれた領域である。外径側縁部７２のタイヤ周方向における長さをＸ２としたとき、点Ｇは、点Ｂから外径側縁部７２上に沿って１／４Ｘ２の長さ第２周方向Ｌに離れている。 The second region 20 includes an arc-shaped line segment CE connecting the point C and the point E, an arc-shaped line segment CG connecting the point C and the point G on the outer diameter side edge portion 72, and a line segment EF. , A region surrounded by an arc-shaped line segment GF connecting the points G and F. When the length of the outer diameter side edge portion 72 in the tire circumferential direction is X2, the point G is separated from the point B along the outer diameter side edge portion 72 by a length of 1 / 4X2 in the second circumferential direction L. There is.

線分ＣＧは、第１周方向Ｒに向かって曲率半径が次第に大きくなる円弧状に形成されている。同一周方向位置において、線分ＣＧの曲率半径は、線分ＥＦの曲率半径よりも大きい。第２領域２０は、第１周方向Ｒに向かって、タイヤ径方向における長さが、点Ｃから点Ｅに向かって増大し、点Ｅから第２領域２０の周方向の中央に位置する中央部２０ａに向かって減少し、中央部２０ａから点Ｇに向かって増大し、点Ｇから点Ｆに向かって減少している。 The line segment CG is formed in an arc shape in which the radius of curvature gradually increases toward the first circumferential direction R. At the same circumferential position, the radius of curvature of the line segment CG is larger than the radius of curvature of the line segment EF. In the second region 20, the length in the tire radial direction increases from the point C toward the point E toward the first circumferential direction R, and is located at the center of the second region 20 from the point E in the circumferential direction. It decreases toward the portion 20a, increases from the central portion 20a toward the point G, and decreases from the point G toward the point F.

すなわち、第２領域２０は、第１領域１０と第３領域３０とにタイヤ径方向に挟まれた部分（周方向における点Ｅと点Ｇとの間）において、タイヤ径方向の中央部２０ａがタイヤ径方向に狭く、中央部２０ａから第１周方向Ｒおよび第２周方向Ｌに向かってタイヤ径方向に拡がっている。 That is, in the second region 20, the central portion 20a in the tire radial direction is located in the portion sandwiched between the first region 10 and the third region 30 in the tire radial direction (between the points E and G in the circumferential direction). It is narrow in the tire radial direction and extends in the tire radial direction from the central portion 20a toward the first circumferential direction R and the second circumferential direction L.

第２領域２０は、セレーション部７のうち、第２周方向Ｌのタイヤ径方向における内径側端部から、第１周方向Ｒのタイヤ径方向における外径側端部まで延びており、第１周方向Ｒに向かってタイヤ径方向の外径側に傾斜した方向に延びている。第２領域２０の中央部２０ａは、セレーション部７のタイヤ径方向における略中間に位置している。 The second region 20 extends from the inner diameter side end portion of the serration portion 7 in the tire radial direction in the second circumferential direction L to the outer diameter side end portion in the tire radial direction in the first circumferential direction R, and is the first. It extends in a direction inclined toward the outer diameter side in the tire radial direction toward the circumferential direction R. The central portion 20a of the second region 20 is located substantially in the middle of the serration portion 7 in the tire radial direction.

第３領域３０は、線分ＣＧと、第２径方向縁部７４と、点Ｄと点Ｇとを結ぶ円弧状の線分ＤＧとによって囲まれた領域である。線分ＤＧは、外径側縁部７２上を延びている。第３領域３０は、第１周方向Ｒに向かって次第にタイヤ径方向における長さが減少している。 The third region 30 is a region surrounded by the line segment CG, the second radial edge portion 74, and the arc-shaped line segment DG connecting the points D and G. The line segment DG extends on the outer diameter side edge portion 72. The length of the third region 30 gradually decreases in the tire radial direction toward the first circumferential direction R.

なお、線分ＥＦおよび線分ＣＧは仮想線であり、第２領域２０は、第１領域１０に対して線分ＥＦによって境界付けられており、第３領域３０に対して線分ＣＧによって境界付けられている。 The line segment EF and the line segment CG are virtual lines, the second region 20 is bounded by the line segment EF with respect to the first region 10, and the third region 30 is bounded by the line segment CG. It is attached.

複数の第１セレーション１１および複数の第３セレーション３１は屈曲して延びている。一方、複数の第２セレーション２１は直線状に延びている。第１セレーション１１および第２セレーション２１は、仮想線分ＥＦにおいて互いに接続されていない。第２セレーション２１および第３セレーション３１は、仮想線分ＣＧにおいて互いに接続されていない。 The plurality of first serrations 11 and the plurality of third serrations 31 are bent and extended. On the other hand, the plurality of second serrations 21 extend linearly. The first serration 11 and the second serration 21 are not connected to each other in the virtual line segment EF. The second serration 21 and the third serration 31 are not connected to each other in the virtual line segment CG.

複数の第２セレーション２１は、内径側縁部７１のタイヤ周方向における略中間点Ｈにおいてタイヤ径方向に向かう中間部径方向Ａ１に対して平行に延びている。複数の第１セレーション１１は、中間部径方向Ａ１に直交する直交方向Ａ２に延びており、直交方向Ａ２において所定間隔で中間部径方向Ａ１に振幅を有する振幅部１２を有している。複数の第３セレーション３１も、第１セレーション１１と同様に、直交方向Ａ２に延びており、直交方向Ａ２において所定間隔で中間部径方向Ａ１に振幅を有する振幅部３２を有している。 The plurality of second serrations 21 extend parallel to the intermediate portion radial direction A1 toward the tire radial direction at a substantially intermediate point H in the tire circumferential direction of the inner diameter side edge portion 71. The plurality of first serrations 11 extend in the orthogonal direction A2 orthogonal to the intermediate portion radial direction A1, and have amplitude portions 12 having an amplitude in the intermediate portion radial direction A1 at predetermined intervals in the orthogonal direction A2. Similar to the first serration 11, the plurality of third serrations 31 also extend in the orthogonal direction A2, and have amplitude portions 32 having amplitudes in the intermediate portion radial direction A1 at predetermined intervals in the orthogonal direction A2.

図３は、図２のIII−III線に沿った第２セレーション２１の延在方向に直交する断面図である。図３に示されるように、第２セレーション２１は、三角形状の断面形状に構成されている。図示は省略するが、第１セレーション１１および第３セレーション３１も同様に、三角形状の断面形状に構成されている。なお、図３において二点鎖線で示すように、第１〜第３セレーション１１，２１，３１を、台形状の断面形状に構成してもよい。 FIG. 3 is a cross-sectional view orthogonal to the extending direction of the second serration 21 along the line III-III of FIG. As shown in FIG. 3, the second serration 21 is configured to have a triangular cross-sectional shape. Although not shown, the first serration 11 and the third serration 31 are similarly configured to have a triangular cross-sectional shape. As shown by the alternate long and short dash line in FIG. 3, the first to third serrations 11, 21, and 31 may be formed in a trapezoidal cross-sectional shape.

上記実施形態に係る空気入りタイヤ１によれば、以下の効果を奏する。 According to the pneumatic tire 1 according to the above embodiment, the following effects are obtained.

（１）第１領域１０および第３領域３０には屈曲して延びる第１セレーション２１および第３セレーション３１が形成されているので、直線状に延びる第２セレーション２１が形成された第２領域２０に比して、光の乱反射が生じにくい。 (1) Since the first serration 21 and the third serration 31 extending by bending are formed in the first region 10 and the third region 30, the second region 20 in which the second serration 21 extending linearly is formed is formed. Diffuse reflection of light is less likely to occur.

この結果、第１領域１０および第３領域３０がタイヤ色である黒色がより濃く見えやすく、第１領域１０および第３領域３０に比して乱反射が生じやすい第２領域２０を明るく見えやすくして目立たせることができる。したがって、セレーション部７によってタイヤサイド部５の凹凸を目立ち難くしつつ、セレーション部７に黒色の濃淡をつけやすくタイヤサイド部５における美観性を高めやすい。 As a result, black, which is the tire color of the first region 10 and the third region 30, is more likely to appear darker, and the second region 20 where diffuse reflection is more likely to occur than the first region 10 and the third region 30 is easily seen brighter. Can make it stand out. Therefore, while making the unevenness of the tire side portion 5 less noticeable by the serration portion 7, it is easy to add shades of black to the serration portion 7, and it is easy to enhance the aesthetic appearance of the tire side portion 5.

（２）直線状の第２セレーション２１が形成されている第２領域２０は、屈曲した第１セレーション１１および第３セレーション３１が形成されている第１領域１０および第３領域３０に比してタイヤサイド部５の面剛性を高めにくい。このため、接地時における、タイヤサイド部５のタイヤ幅方向への膨出変形にかかる曲げ稜線は、相対的に面剛性が低い第２領域２０に集中しやすい。 (2) The second region 20 in which the linear second serration 21 is formed is compared with the first region 10 and the third region 30 in which the bent first serration 11 and the third serration 31 are formed. It is difficult to increase the surface rigidity of the tire side portion 5. Therefore, the bent ridge line that is subjected to the bulging deformation of the tire side portion 5 in the tire width direction at the time of touchdown tends to be concentrated in the second region 20 having a relatively low surface rigidity.

しかしながら、第２領域２０は、第１周方向Ｒに向かってタイヤ径方向の外径側に傾斜しているので、タイヤサイド部５の上記曲げ稜線を第２領域２０に沿ってタイヤ周方向に対して傾斜させやすい。これによって、タイヤサイド部５の曲げ稜線が同一径方向位置に集中する場合に比して、タイヤサイド部５の曲げ変形を抑制することができる。よって、第２領域２０に直線状の第２セレーション２１を形成しつつも、タイヤサイド部５の剛性低下が抑制される。 However, since the second region 20 is inclined toward the outer diameter side in the tire radial direction toward the first circumferential direction R, the bent ridge line of the tire side portion 5 is oriented in the tire circumferential direction along the second circumferential direction 20. On the other hand, it is easy to tilt. As a result, bending deformation of the tire side portion 5 can be suppressed as compared with the case where the bending ridge lines of the tire side portion 5 are concentrated in the same radial position. Therefore, while forming the linear second serration 21 in the second region 20, the decrease in the rigidity of the tire side portion 5 is suppressed.

（３）第２領域２０のうち、タイヤ径方向の中央部に位置しているために面剛性が低下しやすい中央部２０ａを、タイヤ径方向に小さく構成することによって、中央部２０ａにおける面剛性の低下を抑制しやすい。よって、タイヤサイド部５の剛性低下がさらに抑制される。一方、第２領域２０のうち中央部２０ａからタイヤ周方向の両側に離れた部分は、中央部２０ａに比してタイヤ径方向の両側に位置しているので面剛性が低下しにくく、タイヤ径方向に大きく構成することによって美観性を高めやすい。 (3) Of the second region 20, the surface rigidity in the central portion 20a is formed by making the central portion 20a, which is located in the central portion in the tire radial direction and therefore the surface rigidity tends to decrease, small in the tire radial direction. It is easy to suppress the decrease of. Therefore, the decrease in rigidity of the tire side portion 5 is further suppressed. On the other hand, the portions of the second region 20 that are separated from the central portion 20a on both sides in the tire circumferential direction are located on both sides in the tire radial direction as compared with the central portion 20a, so that the surface rigidity is unlikely to decrease and the tire diameter. It is easy to enhance the aesthetics by configuring it large in the direction.

（４）第２セレーション２１はタイヤ径方向に直線状に延びているので、第２領域２０のタイヤ径方向における剛性を高めやすい。よって、タイヤサイド部５のタイヤ径方向における剛性低下がさらに抑制される。 (4) Since the second serration 21 extends linearly in the tire radial direction, it is easy to increase the rigidity of the second region 20 in the tire radial direction. Therefore, the decrease in rigidity of the tire side portion 5 in the tire radial direction is further suppressed.

（５）第１領域１０および第３領域３０には、屈曲した第１セレーション１１および第３セレーション３１が形成されているので、面剛性が高くなりやすいが、第１セレーション１１および第３セレーション３１は、タイヤ径方向と直交する方向に形成されている。これによって、第１領域１０および第３領域３０のタイヤ径方向における曲げ剛性が過度に高くなることが抑制され、第２領域２０へのタイヤサイド部５の曲げ稜線の集中を緩和しやすい。 (5) Since the bent first serrations 11 and third serrations 31 are formed in the first region 10 and the third region 30, the surface rigidity tends to be high, but the first serrations 11 and the third serrations 31 tend to be high. Is formed in a direction orthogonal to the tire radial direction. As a result, it is possible to prevent the bending rigidity of the first region 10 and the third region 30 from becoming excessively high in the tire radial direction, and it is easy to ease the concentration of the bending ridge line of the tire side portion 5 on the second region 20.

よって、タイヤサイド部５の曲げ変形を、セレーション部７において第２領域２０への集中を緩和させつつ、第１領域１０および第３領域３０にも分散させやすい。したがって、タイヤサイド部５のタイヤ径方向における剛性低下がさらに抑制される。 Therefore, it is easy to disperse the bending deformation of the tire side portion 5 in the first region 10 and the third region 30 while relaxing the concentration in the second region 20 in the serration portion 7. Therefore, the decrease in rigidity of the tire side portion 5 in the tire radial direction is further suppressed.

上記実施形態では、セレーション部７を、第１領域１０と第２領域２０と第３領域３０とに、３つに分けた場合を例にとって説明したが、２つに分割してもよく、４つ以上に分割してもよい。領域ごとに、屈曲したセレーションまたは直線状のセレーションを形成することによって、屈曲したセレーションが形成された領域を、黒色をより濃く見せつつ、直線状のセレーションが形成された領域を乱反射によって相対的に明るく見せやすくより目立たせることができる。 In the above embodiment, the case where the serration unit 7 is divided into the first region 10, the second region 20, and the third region 30 has been described as an example, but it may be divided into two. It may be divided into two or more. By forming bent serrations or linear serrations for each region, the regions where the bent serrations are formed appear darker in black, while the regions where the linear serrations are formed are relatively diffused. It is easy to look bright and can be made more noticeable.

また、上記実施形態では、セレーション部７を、タイヤサイド部５のうち径方向に一対の周方向における１／４の領域に設けた場合を例にとって説明したが、さらに広い領域に設けたり、より狭い領域に設けたり、全周にわたって設けたりしてもよい。 Further, in the above embodiment, the case where the serration portion 7 is provided in a region of 1/4 of the pair of tire side portions 5 in the radial direction in the circumferential direction has been described as an example, but the serration portion 7 may be provided in a wider region or more. It may be provided in a narrow area or may be provided over the entire circumference.

なお、本発明は、上記実施形態に記載された構成に限定されるものではなく、種々の変更が可能である。 The present invention is not limited to the configuration described in the above embodiment, and various modifications can be made.

１ 空気入りタイヤ
２ トレッド部
３ ビード部
５ タイヤサイド部
７ セレーション部
１０ 第１領域
１１ 第１セレーション
２０ 第２領域
２０ａ 中央部
２１ 第２セレーション
３０ 第３領域
３１ 第３セレーション
７１ 内径側縁部
７２ 外径側縁部
７３ 第１径方向縁部
７４ 第２径方向縁部 1 Pneumatic tire 2 Tread part 3 Bead part 5 Tire side part 7 Serration part 10 1st area 11 1st serration 20 2nd area 20a Central part 21 2nd serration 30 3rd area 31 3rd serration 71 Inner diameter side edge 72 Outer radial side edge 73 1st radial edge 74 2nd radial edge

Claims (5)

タイヤサイド部に、円弧状に延びるセレーション部を備え、
前記セレーション部は、
複数の第１セレーションが形成された、第１領域と、
前記第１領域に対してタイヤ径方向の外側に隣接しており、複数の第２セレーションが形成された、第２領域と、
前記第２領域に対してタイヤ径方向外側に隣接しており、複数の第３セレーションが形成された、第３領域と
を有し、
前記第１セレーションおよび前記第３セレーションは、屈曲して延びており、
前記第２セレーションは、直線状に延びている空気入りタイヤ。 The tire side part is equipped with a serration part that extends in an arc shape.
The serration part
A first region in which a plurality of first serrations are formed,
A second region, which is adjacent to the outer side in the tire radial direction with respect to the first region and in which a plurality of second serrations are formed,
It has a third region adjacent to the second region on the outer side in the tire radial direction and in which a plurality of third serrations are formed.
The first serration and the third serration are bent and extended.
The second serration is a pneumatic tire extending in a straight line. 前記第２領域は、前記セレーション部のうち、タイヤ周方向の一端部側におけるタイヤ径方向の内径側端部から、タイヤ周方向の他端部側におけるタイヤ径方向の外径側端部まで、タイヤ周方向の他端部側に向かってタイヤ径方向の外側に傾斜した方向に延びている、
請求項１に記載の空気入りタイヤ。 The second region extends from the inner diameter side end portion in the tire radial direction on the one end side in the tire circumferential direction to the outer radial side end portion in the tire radial direction on the other end side in the tire circumferential direction. It extends in a direction inclined outward in the tire radial direction toward the other end side in the tire circumferential direction.
The pneumatic tire according to claim 1. 前記第２領域は、前記第１領域と前記第３領域とにタイヤ径方向に挟まれた部分のうち、タイヤ径方向の中央部がタイヤ径方向に狭く、前記中央部からタイヤ周方向の両側に向かってタイヤ径方向に拡がっている、
請求項１又は２に記載の空気入りタイヤ。 In the second region, of the portions sandwiched between the first region and the third region in the tire radial direction, the central portion in the tire radial direction is narrow in the tire radial direction, and both sides from the central portion in the tire circumferential direction. Spreading in the tire radial direction toward
The pneumatic tire according to claim 1 or 2. 前記複数の第２セレーションは、タイヤ径方向に直線状に延びている、
請求項１〜３のいずれか１つに記載の空気入りタイヤ。 The plurality of second serrations extend linearly in the tire radial direction.
The pneumatic tire according to any one of claims 1 to 3. 前記複数の第１セレーションおよび前記複数の第３セレーションは、前記第２セレーションの延在方向に直交する方向に延びており、前記第２セレーションの延在方向に振幅を有している、
請求項４に記載の空気入りタイヤ。 The plurality of first serrations and the plurality of third serrations extend in a direction orthogonal to the extending direction of the second serration and have an amplitude in the extending direction of the second serration.
The pneumatic tire according to claim 4.
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