JP2009083769A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2009083769A
JP2009083769A JP2007258697A JP2007258697A JP2009083769A JP 2009083769 A JP2009083769 A JP 2009083769A JP 2007258697 A JP2007258697 A JP 2007258697A JP 2007258697 A JP2007258697 A JP 2007258697A JP 2009083769 A JP2009083769 A JP 2009083769A
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tire
bead
width direction
pneumatic tire
recess
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Keiichi Kurita
圭一 栗田
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Bridgestone Corp
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Bridgestone Corp
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Priority to JP2007258697A priority Critical patent/JP2009083769A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of realizing suppression of heat generation of a bead part and light weight without generating wrinkle, crack or the like on the bead part even if a recession part is formed by a single circular arc. <P>SOLUTION: The pneumatic tire is provided with a tread part 1; a pair of side wall parts 2; a pair of bead parts 3; a carcass 5 having a body part 5a and a folded/returned part 5b; and a side rubber 8. A recession part 10 is formed on the side rubber 8, and one or more of projection 11 divided by a line segment including at least one circular arc in a cross section in a tire width direction and continuously extending in a circumference direction is arranged on a surface of the recession part 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ビード部の耐久性に優れる空気入りタイヤ、なかでもトラック・バス等の重荷重車両用の空気入りタイヤに関するものであり、ビード部の凹部形成箇所に皺、割れ等を発生させることなしに、ビード部の発熱の抑制と、タイヤの軽量化とを実現できる技術を提案するものである。   TECHNICAL FIELD The present invention relates to a pneumatic tire excellent in durability of a bead part, and more particularly to a pneumatic tire for heavy-duty vehicles such as trucks and buses, and generates wrinkles, cracks, etc. in a recessed portion forming part of the bead part. The present invention proposes a technology capable of suppressing heat generation at the bead portion and reducing the weight of the tire.

空気入りタイヤの、ビード部の発熱耐久性の向上および、タイヤの軽量化のため、例えば、特許文献１には、タイヤ最大幅位置と、ビード部外側面がリムフランジから離反する位置との間で、外側ゴム層に凹部を形成し、凹部におけるタイヤ側部の総厚みを、タイヤ最大幅位置におけるタイヤ側部の総厚み以上とするとともに、凹部の最大深さを１．５ｍｍ以上とすることによって、ゴム重量を削減してタイヤの軽量化を図り、蓄熱を抑えることを企図した空気入りタイヤが記載されている。   In order to improve the heat generation durability of the bead part of the pneumatic tire and reduce the weight of the tire, for example, Patent Document 1 discloses a position between the tire maximum width position and the position where the outer surface of the bead part separates from the rim flange. Then, a recess is formed in the outer rubber layer, and the total thickness of the tire side portion in the recess is not less than the total thickness of the tire side portion in the tire maximum width position, and the maximum depth of the recess is not less than 1.5 mm. Describes a pneumatic tire designed to reduce the weight of the rubber to reduce the weight of the tire and suppress heat storage.

しかるに、この特許文献１に記載され空気入りタイヤは、凹部が単一円弧で形成されているため、負荷転動中の、凹部の形成箇所に半径方向内方に向く圧縮歪および半径方向外方に向く引張り歪が繰り返し加わるため、その極値となる場所に、改良を加える必要があった。
特開２０００−１５８９１９号公報 However, in the pneumatic tire described in Patent Document 1, since the concave portion is formed by a single circular arc, the compressive strain and the radially outward direction are directed radially inward at the location where the concave portion is formed during load rolling. Therefore, it was necessary to improve the location where the extreme value was reached.
JP 2000-158919 A

そこで、本発明の目的は、単一円弧をもって凹部を形成してなお、ビード部に皺、割れ等を発生させることなしにビード部の発熱の抑制と、タイヤの軽量化とを実現できる空気入りタイヤを提供することにある。   Accordingly, an object of the present invention is to provide a pneumatic system capable of suppressing heat generation of the bead part and reducing the weight of the tire without causing wrinkles, cracks, etc. in the bead part even when the concave part is formed with a single arc. To provide tires.

この発明にかかる空気入りタイヤは、トレッド部と、トレッド部のそれぞれの側部に連続して一対のサイドウォール部と、それぞれのサイドウォール部の内周側に連続する一対のビード部と、ビード部に各々埋設されたビードコア間にトロイド状に延在する本体部及び各ビードコアの周りで折り返された折り返し部を持つ少なくとも一枚のカーカスプライからなる、例えばラジアル構造のカーカスと、カーカスの、タイヤ幅方向外側に配置されるサイドゴムとを具え、タイヤ幅方向断面内で、サイドウォール部およびビード部の少なくとも一方の外側面で、サイドゴムに、カーカスよりタイヤ幅方向外側に中心を有する一つ以上の円弧からなる凹部を形成してなるものであって、前記凹部の表面に、タイヤ幅方向断面内での、少なくとも一つの円弧を含む線分で区画され、円周方向に連続して延びる突起が一つ以上配置されていることを特徴とするものである。   A pneumatic tire according to the present invention includes a tread portion, a pair of sidewall portions that are continuous to the respective side portions of the tread portion, a pair of bead portions that are continuous to the inner peripheral side of each sidewall portion, and a bead A carcass ply having, for example, a radial structure and a carcass ply having at least one carcass ply having a main body portion extending in a toroidal manner between bead cores embedded in each portion and a folded portion around each bead core. One or more having a center on the outer side in the tire width direction than the carcass on the side rubber on the outer surface of at least one of the side wall part and the bead part in the cross section in the tire width direction. A recess formed of an arc is formed, and the surface of the recess is at least one in a cross section in the tire width direction. Is defined by a line segment that includes an arc, extending circumferentially continuous projection is characterized in that it is arranged one or more.

ここで、「一つ以上の円弧からなる凹部」とは、複数の円弧の組み合わせによる凹部をも含む意である。   Here, the “concave portion formed of one or more arcs” is meant to include a concave portion formed by a combination of a plurality of arcs.

このようなタイヤにおいてより好ましくは、突起を、凹部内に二〜四個配置する。
ここで、凹部内に含まれる複数の突起のそれぞれの、タイヤ幅方向断面内の形状は、相互に同一のものとする他、相互に相違させることも可能である。 In such a tire, more preferably, two to four protrusions are arranged in the recess.
Here, the shape of each of the plurality of protrusions included in the recess in the cross section in the tire width direction may be the same as each other, or may be different from each other.

また好ましくは一の突起を、タイヤ幅方向断面内の二つの突起区画用円弧で区画する。   Preferably, one protrusion is defined by two protrusion defining arcs in the cross section in the tire width direction.

より好ましくは、突起区画用円弧の曲率半径を３〜６０ｍｍの範囲とする。   More preferably, the radius of curvature of the projection partitioning arc is in the range of 3 to 60 mm.

そしてまた好ましくは、適用リムへの組付け前の、凹部区画用円弧の曲率半径を１０〜２００ｍｍの範囲とする。
ここで、「適用リム」とは、ＪＡＴＭＡ（日本自動車タイヤ協会） ＹＥＡＲ ＢＯＯＫ、ＥＴＲＴＯ（Ｅｕｒｏｐｅａｎ Ｔｙｒｅ ａｎｄ Ｒｉｍ Ｔｅｃｈｎｉｃａｌ Ｏｒｇａｎｉｓａｔｉｏｎ） ＳＴＡＮＤＡＲＤ ＭＡＮＵＡＬ、ＴＲＡ（ＴＨＥ ＴＩＲＥ ａｎｄ ＲＩＭ ＡＳＳＯＣＩＡＴＩＯＮ ＩＮＣ．）ＹＥＡＲ ＢＯＯＫ等に規定されたリムをいうものとする。 And preferably, the radius of curvature of the arc for concave sectioning before assembling to the applicable rim is in the range of 10 to 200 mm.
Here, the “applicable rim” is defined by JATMA (Japan Automobile Tire Association) YEAR BOOK, ETRTO (European Tire and Rim Technical Organization) STANDARD MANUAL, TRA (THE TIRE and RIM ASOCIATION IN. It shall be said.

ところで、適用リムへの組付け前の、凹部の半径方向外方端を、タイヤ幅方向断面内で、タイヤ幅方向外側に凸となる曲線状をなすサイドウォール部の外側面との接点に位置することが好ましい。   By the way, before assembling to the applicable rim, the radially outer end of the concave portion is positioned at the contact point with the outer side surface of the sidewall portion that is curved outwardly in the tire width direction in the tire width direction cross section. It is preferable to do.

また好ましくは、凹部の半径方向内方端を、適用リムのリムフランジの円弧中心からカーカスの本体部に下ろした垂線と、タイヤ外表面との交点から、タイヤ外表面に沿って半径方向外方に測って５〜２５ｍｍの範囲に位置させる。   Preferably, the radially inner end of the recess is radially outward along the tire outer surface from the intersection of the perpendicular line extending from the arc center of the rim flange of the applicable rim to the main body of the carcass and the tire outer surface. Measured in the range of 5 to 25 mm.

本発明の空気入りタイヤでは、凹部の表面に、タイヤ幅方向断面内での、少なくとも一つの円弧を含む線分で区画され、円周方向に連続して延びる突起が一つ以上配置することにより、タイヤの撓みによる曲げ変形を受ける時の圧縮歪が、突起を設けない凹部に比べ、凹部内の突起により、曲げ変形を受け難くなり、その歪はそれぞれの凹部の突起隣接域に分散する。その結果、ビード部の凹部の一箇所に集中しがちな皺や亀裂の発生を抑制することができる   In the pneumatic tire of the present invention, one or more protrusions that are partitioned by a line segment including at least one arc in the tire width direction cross section and continuously extending in the circumferential direction are disposed on the surface of the recess. The compressive strain when subjected to bending deformation due to the bending of the tire is less susceptible to bending deformation due to the projections in the recesses than in the recesses where no projections are provided, and the strains are distributed in the adjacent regions of the recesses. As a result, it is possible to suppress the occurrence of wrinkles and cracks that tend to concentrate on one location of the concave portion of the bead portion.

凹部の表面に、突起を一つ以上配置することにより、突起に加わる歪が突起隣接域に分散する。特に、凹部に加わる歪のうち、最も大きい歪が、突起隣接域に分散される。その結果、ビード部の凹部の一箇所に集中しがちな皺や亀裂の発生を抑制することができる。   By disposing one or more protrusions on the surface of the recess, strain applied to the protrusions is dispersed in the protrusion adjacent area. In particular, the largest strain among the strains applied to the recesses is dispersed in the adjacent region of the protrusion. As a result, it is possible to suppress the occurrence of wrinkles and cracks that tend to concentrate on one part of the concave portion of the bead portion.

突起を、少なくとも一つの円弧を含む線分で区画することにより、凹部に明確な凸凹形状を作成することができ、ビード部の凹部の一箇所に集中しがちな皺や亀裂の発生を抑制することができる。   By partitioning the protrusion with a line segment including at least one arc, it is possible to create a clear uneven shape in the recessed portion, and to suppress the occurrence of wrinkles and cracks that tend to concentrate in one place in the recessed portion of the bead portion be able to.

以下に、図面を参照しながら本発明の空気入りタイヤを詳細に説明する。
図１は、本発明の空気入りタイヤの一の実施形態を、適用リムに組付けて規定の空気圧を充填した状態の、タイヤの半部についての幅方向断面図である。
図２は、図１のビード部とサイドウォール部の一部をより詳細に示す要部拡大断面図である。 Hereinafter, the pneumatic tire of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view in the width direction of a half portion of a tire in a state where one embodiment of a pneumatic tire of the present invention is assembled to an applicable rim and filled with a prescribed air pressure.
FIG. 2 is an enlarged cross-sectional view of a main part showing a part of the bead part and the side wall part of FIG. 1 in more detail.

図中１はトレッド部を、２はトレッド部１のそれぞれの側部に連続して半径方向内方へ延びる一対のサイドウォール部を、そして３はサイドウォール部２の半径方向内方に連続するビード部をそれぞれ示す。   In the figure, 1 is a tread portion, 2 is a pair of side wall portions extending radially inward continuously to the respective side portions of the tread portion 1, and 3 is continuously inward in the radial direction of the sidewall portion 2. Each bead portion is shown.

図示の空気入りタイヤは、一対のビード部３と、各ビード部３に埋設された六角形断面のビードコア４間にトロイド状に延在する本体部５ａ及び、ビードコア４の周りで折り返された折り返し部５ｂを有する、一枚のカーカスプライからなるカーカス５を具える。
ここで、カーカスプライは、例えば、タイヤ周方向と直交する方向に延びるスチールコード、有機繊維コード等にて形成することができる。 The illustrated pneumatic tire includes a pair of bead parts 3, a main body part 5 a extending in a toroid shape between bead cores 4 having a hexagonal cross section embedded in each bead part 3, and folded back around the bead cores 4. A carcass 5 having a single carcass ply having a portion 5b is provided.
Here, the carcass ply can be formed of, for example, a steel cord or an organic fiber cord extending in a direction orthogonal to the tire circumferential direction.

カーカス５の半径方向外方にはベルト６およびトレッドゴム７が配置され、このトレッドゴム７の表面には、例えば、タイヤ周方向に延びる複数本の周溝等を形成することができる。   A belt 6 and a tread rubber 7 are arranged on the outer side in the radial direction of the carcass 5, and a plurality of circumferential grooves extending in the tire circumferential direction can be formed on the surface of the tread rubber 7, for example.

サイドウォール部２およびビード部３では、カーカス５のタイヤ幅方向外側が、それらの外側面に沿って、配置されたサイドゴム８によって覆われている。   In the sidewall portion 2 and the bead portion 3, the outer side in the tire width direction of the carcass 5 is covered with the side rubber 8 arranged along the outer side surfaces thereof.

また、ビード部３には、ビードコア４の半径方向外方でカーカス５の本体部５ａと折り返し部５ｂとの間に半径方向外方に向けて厚みを漸減する略三角形の断面形状のスティフナーゴム９を配設する。   Further, the bead portion 3 has a substantially triangular cross-sectional stiffener rubber 9 that gradually decreases in thickness radially outwardly between the body portion 5a and the folded portion 5b of the carcass 5 outside the bead core 4 in the radial direction. Is disposed.

サイドウォール部２およびビード部３の外側面には、サイドゴム８に、カーカス５よりタイヤ幅方向外側に中心を有し、曲率半径Ｒを10〜２００ｍｍの範囲とする、単一円弧からなる凹部１０が形成されている。
凹部１０の半径方向外方端１０ａは、タイヤ幅方向外側に凸となる曲線状をなすサイドウォール部２の外側面との接点に位置する。一方、凹部１０の半径方向内方端１０ｂは、適用リム１２のリムフランジ１２ｆの円弧中心からカーカス５の本体部５ａに下ろした垂線Ｐから、タイヤ外側面に沿って測った長さｌが５〜２５ｍｍの範囲内に位置する。
円弧によって形成される凹部１０は、半径方向外方端１０ａから半径方向内方端１０ｂに向けて、略半径方向内方に形成する。 On the outer side surfaces of the sidewall portion 2 and the bead portion 3, a concave portion 10 made of a single arc having a center on the outer side in the tire width direction from the carcass 5 and having a radius of curvature R in the range of 10 to 200 mm. Is formed.
The radially outer end 10a of the recess 10 is located at a contact point with the outer side surface of the sidewall portion 2 having a curved shape protruding outward in the tire width direction. On the other hand, the radially inner end 10b of the recess 10 has a length l measured along the tire outer surface from a perpendicular line P, which extends from the center of the arc of the rim flange 12f of the rim 12 to the main body 5a of the carcass 5. Located within a range of ~ 25 mm.
The recess 10 formed by the circular arc is formed substantially radially inward from the radially outer end 10a toward the radially inner end 10b.

サイドゴム８に、凹部１０を設けることにより、サイドゴム８のゴム使用量が減少し、全体的に薄くすることができる。その結果、タイヤ重量の軽量化を図ることができる。   By providing the recess 10 in the side rubber 8, the amount of rubber used in the side rubber 8 can be reduced, and the overall thickness can be reduced. As a result, the weight of the tire can be reduced.

さらに、凹部１０の表面で、ビード部３の外側面のタイヤ幅方向外側に曲率中心を有し、曲率半径ｒを３〜６０ｍｍの範囲とする、二つの単一円弧で区画され、円周方向に延びる突起１１が、二個配置されている。   Furthermore, on the surface of the recess 10, the outer surface of the bead portion 3 has a center of curvature on the outer side in the tire width direction, and is divided by two single arcs having a radius of curvature r in the range of 3 to 60 mm. Two protrusions 11 extending in the direction are arranged.

このようなタイヤでは、負荷転動中の、タイヤのビード部３が倒れるような変形時の歪は、突起１１がない場合は最大変形する部分に凹部１０の表面の歪が集中していたが、突起１１を一つ以上設けることで、それぞれの突起１１が歪を突起隣接域に分散する。その結果、ビード部３の凹部１０の皺や亀裂の発生を抑制することができる。   In such a tire, the deformation at the time of deformation that causes the bead portion 3 of the tire to fall during load rolling is concentrated on the surface of the concave portion 10 at the maximum deformation portion when there is no protrusion 11. By providing one or more projections 11, each projection 11 disperses the strain in the adjacent region of the projection. As a result, generation of wrinkles and cracks in the concave portion 10 of the bead portion 3 can be suppressed.

また、突起１１を、凹部１０内に二〜四個配置することにより、その分散の効果を増大することができる。   Further, by disposing two to four protrusions 11 in the recess 10, the dispersion effect can be increased.

その一の突起１１を、二つの突起区画用円弧で区画することにより、突起１１を直線で区画した時に発生する角部がなくなり、更に分散効果を高くすることができる。   By dividing the one projection 11 by two projection partitioning arcs, there is no corner portion generated when the projection 11 is partitioned by a straight line, and the dispersion effect can be further enhanced.

しかも、突起区画用円弧の曲率半径ｒを３〜６０ｍｍの範囲とすることにより、実用性と効果のバランスが設計上良好にすることができる。   In addition, by setting the radius of curvature r of the arc for projecting section to be in the range of 3 to 60 mm, the balance between practicality and effect can be improved in design.

すなわち、それが３ｍｍ未満では、凹部１０内の凹凸が小さくなるため分散の効果が弱くなる傾向がある。一方、６０ｍｍを越えると、突起１１の高さが低くなるとともに、隣接する突起間の距離が離れすぎる傾向がある。   That is, if it is less than 3 mm, the unevenness in the recesses 10 becomes small, and the dispersion effect tends to be weakened. On the other hand, when it exceeds 60 mm, the height of the protrusion 11 becomes low and the distance between adjacent protrusions tends to be too large.

凹部区画用円弧の曲率半径Ｒを１０〜２００ｍｍの範囲とすることにより、有効に軽量化することができる。   By setting the curvature radius R of the arc for concave section to be in the range of 10 to 200 mm, the weight can be effectively reduced.

すなわち、それが１０ｍｍ未満では、凹部１０の歪が大きくなることにより、耐久性が悪化する傾向がある。一方、２００ｍｍを越えると、凹部１０のゴム抉り量が少なくなり、軽量化の割合が小さくなる傾向がある。   In other words, if it is less than 10 mm, the durability tends to deteriorate due to the increased strain of the recess 10. On the other hand, when it exceeds 200 mm, the amount of rubber curling of the recess 10 is reduced, and the proportion of weight reduction tends to be reduced.

凹部１０の半径方向外方端１０ａを、タイヤ幅方向外側に凸となる曲線状をなす中心を有するサイドウォール部２の外側面との接点に位置することにより、半径方向外方端１０ａの歪の集中を防ぐとともに、外観を損なわない傾向がある。   By positioning the radially outer end 10a of the recess 10 at the contact point with the outer surface of the sidewall portion 2 having a curved center that protrudes outward in the tire width direction, the distortion of the radially outer end 10a is determined. There is a tendency not to impair the appearance as well as to prevent concentration.

凹部１０の半径方向内方端１０ｂを、適用リム１２のリムフランジ１２ｆの円弧中心からカーカス５の本体部５ａに下ろした垂線Ｐと、タイヤ外表面との交点から、タイヤ外表面に沿って半径方向外方に測って５〜２５ｍｍの範囲に位置することにより、ビード部３でゴムの総厚みの最も厚い部分を軽量化することができる。   A radius of the radially inner end 10b of the concave portion 10 along the tire outer surface from the intersection of the perpendicular line P extending from the arc center of the rim flange 12f of the applied rim 12 to the main body 5a of the carcass 5 and the tire outer surface. By measuring the outer side in the direction and in the range of 5 to 25 mm, the bead portion 3 can reduce the weight of the thickest portion of the rubber.

すなわち、それが５ｍｍ未満では、負荷加重時に適用リム１２のリムフランジ１２ｆに接する部分の面積が小さくなり、耐久性が低下する傾向がある。一方、２５ｍｍを越えると、凹部１０のゴム抉り量が少なくなり、軽量化の割合が小さくなる傾向がある。   That is, if it is less than 5 mm, the area of the portion of the applied rim 12 that contacts the rim flange 12f when load is applied is reduced, and the durability tends to be lowered. On the other hand, if it exceeds 25 mm, the amount of rubber curling of the recess 10 is reduced, and the proportion of weight reduction tends to be reduced.

次に、図１に示すような構造を有する、タイヤのサイズが２７５／８０Ｒ２２．５のタイヤを試作し、表１に示すように、それぞれの諸元を変化させた実施例タイヤ１〜実施例タイヤ６および、比較例タイヤ１のそれぞれにつき、ビード部の耐久性を、評価した。
なお、本発明ではビード部以外のタイヤ構造については改変を要しないため、従来の空気入りタイヤの構造とほぼ同様とした。 Next, tires having a structure as shown in FIG. 1 and having a tire size of 275 / 80R22.5 were manufactured as prototypes, and various specifications were changed as shown in Table 1. Tires 1 to 1 The durability of the bead portion was evaluated for each of the tire 6 and the comparative tire 1.
In the present invention, since the tire structure other than the bead portion does not require modification, the structure is almost the same as that of a conventional pneumatic tire.

Figure 2009083769
Figure 2009083769

実施例タイヤ１〜実施例タイヤ６、比較例タイヤ１のそれぞれを、リムサイズ８．２５×２２．５のリムに装着し、内圧を９００ｋＰａとし、ドラム試験機上に取り付け、質量４２２５ｋｇ、試験速度６０ｋｍ／ｈ、直径１．７ｍのドラム上を繰り返し走行させ、皺や亀裂発生のような外観の故障がビード部に発生するまでの走行距離として、表２に示す。   Each of Example tire 1 to Example tire 6 and Comparative example tire 1 is mounted on a rim having a rim size of 8.25 × 22.5, an internal pressure is set to 900 kPa, and mounted on a drum testing machine, a mass of 4225 kg, a test speed of 60 km. Table 2 shows the distance traveled until a failure in appearance such as wrinkles and cracks occurs on the bead portion after repeatedly running on a drum having a diameter of 1.7 m / h.

Figure 2009083769
Figure 2009083769

表２の結果から、実施例タイヤ１〜実施例タイヤ６は、比較例タイヤ１に対して、ビード部の故障発生までの走行距離が向上した。   From the results shown in Table 2, in the example tire 1 to the example tire 6, the travel distance until the failure of the bead portion was improved with respect to the comparative example tire 1.

本発明の空気入りタイヤの一の実施形態を、適用リムに組付けて規定の空気圧を充填した状態のタイヤ幅方向断面半図である。1 is a half-sectional view in the tire width direction of a state where an embodiment of a pneumatic tire of the present invention is assembled to an applicable rim and filled with a prescribed air pressure. 図１のビード部とサイドウォール部の一部をより詳細に示す要部拡大断面図である。It is a principal part expanded sectional view which shows a bead part and a part of sidewall part of FIG. 1 in detail.

符号の説明Explanation of symbols

１ トレッド部
２ サイドウォール部
３ ビード部
４ ビードコア
５ カーカス
５ａ 本体部
５ｂ 折り返し部
６ ベルト
７ トレッドゴム
８ サイドゴム
９ スティフナーゴム
１０ 凹部
１０ａ 半径方向外方端
１０ｂ 半径方向内方端
１１ 突起
１２ 適用リム
１２ｆ リムフランジ DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 3 Bead part 4 Bead core 5 Carcass 5a Main body part 5b Folding part 6 Belt 7 Tread rubber 8 Side rubber 9 Stiffener rubber 10 Recessed part 10a Radial outer end 10b Radial inner end 11 Projection 12 Applicable rim 12f Rim flange

Claims (7)

トレッド部と、一対のサイドウォール部と、一対のビード部と、各ビード部に埋設されたビードコア間にトロイド状に延在する本体部及び各ビードコアの周りで折り返された折り返し部を持つ少なくとも一枚のカーカスプライからなるカーカスと、カーカスの、タイヤ幅方向外側に配置されるサイドゴムとを具え、タイヤ幅方向断面内で、サイドウォール部およびビード部の少なくとも一方の外側面で、サイドゴムに、カーカスよりタイヤ幅方向外側に中心を有する一つ以上の円弧からなる凹部を形成してなる空気入りタイヤにおいて、
前記凹部の表面に、タイヤ幅方向断面内での、少なくとも一つの円弧を含む線分で区画され、円周方向に連続して延びる突起が一つ以上配置されていることを特徴とする空気入りタイヤ。 At least one having a tread portion, a pair of sidewall portions, a pair of bead portions, a main body portion extending in a toroid shape between bead cores embedded in each bead portion, and a folded portion folded around each bead core. A carcass made of a single carcass ply and a side rubber disposed on the outer side in the tire width direction of the carcass. In a pneumatic tire formed by forming a recess composed of one or more arcs having a center on the outer side in the tire width direction,
One or more protrusions that are partitioned by a line segment including at least one arc in the tire width direction cross section and that extend continuously in the circumferential direction are disposed on the surface of the recess. tire. 突起が、凹部内に二〜四個配置されている請求項１に記載の空気入りタイヤ。   The pneumatic tire according to claim 1, wherein two to four protrusions are disposed in the recess. 一の突起が、タイヤ幅方向断面内での、二つの突起区画用円弧で区画されている請求項１または２に記載の空気入りタイヤ。   The pneumatic tire according to claim 1 or 2, wherein one projection is defined by two projection defining arcs in a cross section in the tire width direction. 突起区画用円弧の曲率半径が３〜６０ｍｍの範囲である請求項１〜３のいずれかに記載の空気入りタイヤ。   The pneumatic tire according to any one of claims 1 to 3, wherein the radius of curvature of the projection partition arc is in the range of 3 to 60 mm. 適用リムへの組付け前の、凹部区画用円弧の曲率半径が１０〜２００ｍｍの範囲である請求項１〜４のいずれかに記載の空気入りタイヤ。   The pneumatic tire according to any one of claims 1 to 4, wherein the radius of curvature of the arc for concave section division is in a range of 10 to 200 mm before assembly to the application rim. 適用リムへの組付け前の、凹部の半径方向外方端が、タイヤ幅方向断面内で、タイヤ幅方向外側に凸となる曲線状をなすサイドウォール部の外側面との接点に位置する請求項１〜５のいずれかに記載の空気入りタイヤ。   The radially outer end of the concave portion before assembly to the application rim is located at the contact point with the outer side surface of the curved sidewall portion that protrudes outward in the tire width direction within the cross section in the tire width direction. The pneumatic tire according to any one of Items 1 to 5. 凹部の半径方向内方端が、適用リムのリムフランジの円弧中心からカーカスの本体部に下ろした垂線と、タイヤ外表面との交点から、タイヤ外表面に沿って半径方向外方に測って５〜２５ｍｍの範囲に位置する請求項１〜６のいずれかに記載の空気入りタイヤ。   The radially inward end of the recess is 5 measured radially outward along the tire outer surface from the intersection of the perpendicular to the carcass body from the arc center of the rim flange of the applicable rim and the tire outer surface. The pneumatic tire according to claim 1, which is located in a range of ˜25 mm.
JP2007258697A 2007-10-02 2007-10-02 Pneumatic tire Pending JP2009083769A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011088565A (en) * 2009-10-23 2011-05-06 Bridgestone Corp Pneumatic tire
US20110247740A1 (en) * 2010-04-08 2011-10-13 Toyo Tire & Rubber Co., Ltd. Pneumatic tire, tire mold and manufacturing method of pneumatic tire
WO2013111890A1 (en) * 2012-01-27 2013-08-01 株式会社ブリヂストン Tire
JP2014083994A (en) * 2012-10-24 2014-05-12 Bridgestone Corp Pneumatic tire
WO2014129572A1 (en) * 2013-02-22 2014-08-28 株式会社ブリヂストン Tire

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839503A (en) * 1981-08-17 1983-03-08 バイエル・アクチエンゲゼルシヤフト Pneumatic tire for heavy load
JPH0752609A (en) * 1993-08-11 1995-02-28 Bridgestone Corp Pneumatic radial tire for high internal pressure heavy load
JPH10193924A (en) * 1997-01-09 1998-07-28 Sumitomo Rubber Ind Ltd Pneumatic tire
JP2000301916A (en) * 1999-04-23 2000-10-31 Bridgestone Corp Pneumatic radial tire
JP2002178719A (en) * 2000-12-12 2002-06-26 Sumitomo Rubber Ind Ltd Pneumatic tire
JP2003170712A (en) * 2001-12-04 2003-06-17 Bridgestone Corp Pneumatic tire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839503A (en) * 1981-08-17 1983-03-08 バイエル・アクチエンゲゼルシヤフト Pneumatic tire for heavy load
JPH0752609A (en) * 1993-08-11 1995-02-28 Bridgestone Corp Pneumatic radial tire for high internal pressure heavy load
JPH10193924A (en) * 1997-01-09 1998-07-28 Sumitomo Rubber Ind Ltd Pneumatic tire
JP2000301916A (en) * 1999-04-23 2000-10-31 Bridgestone Corp Pneumatic radial tire
JP2002178719A (en) * 2000-12-12 2002-06-26 Sumitomo Rubber Ind Ltd Pneumatic tire
JP2003170712A (en) * 2001-12-04 2003-06-17 Bridgestone Corp Pneumatic tire

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011088565A (en) * 2009-10-23 2011-05-06 Bridgestone Corp Pneumatic tire
US20110247740A1 (en) * 2010-04-08 2011-10-13 Toyo Tire & Rubber Co., Ltd. Pneumatic tire, tire mold and manufacturing method of pneumatic tire
AU2013212885B2 (en) * 2012-01-27 2015-10-29 Bridgestone Corporation Tyre
JP2013154702A (en) * 2012-01-27 2013-08-15 Bridgestone Corp Tire
CN104066599A (en) * 2012-01-27 2014-09-24 普利司通股份有限公司 Tire
WO2013111890A1 (en) * 2012-01-27 2013-08-01 株式会社ブリヂストン Tire
RU2597433C2 (en) * 2012-01-27 2016-09-10 Бриджстоун Корпорейшн Tyre
US9956826B2 (en) 2012-01-27 2018-05-01 Bridgestone Corporation Tire
JP2014083994A (en) * 2012-10-24 2014-05-12 Bridgestone Corp Pneumatic tire
US9809064B2 (en) 2012-10-24 2017-11-07 Bridgestone Corporation Pneumatic tire
WO2014129572A1 (en) * 2013-02-22 2014-08-28 株式会社ブリヂストン Tire
JP2014162298A (en) * 2013-02-22 2014-09-08 Bridgestone Corp Tire
CN104995043A (en) * 2013-02-22 2015-10-21 株式会社普利司通 Tire
EP2960081A4 (en) * 2013-02-22 2016-02-24 Bridgestone Corp Tire
US10195910B2 (en) 2013-02-22 2019-02-05 Bridgestone Corporation Tire

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