JP2005145082A - Bead core for tire and pneumatic tire - Google Patents

Bead core for tire and pneumatic tire Download PDF

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JP2005145082A
JP2005145082A JP2003380658A JP2003380658A JP2005145082A JP 2005145082 A JP2005145082 A JP 2005145082A JP 2003380658 A JP2003380658 A JP 2003380658A JP 2003380658 A JP2003380658 A JP 2003380658A JP 2005145082 A JP2005145082 A JP 2005145082A
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tire
bead core
bead
parallel
parallel body
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JP4367914B2 (en
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Shinichi Mori
森　　伸一
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a bead core for a tire and a pneumatic tire using the bead core capable of increasing a steering stability by suppressing twisting and elapse of its shape after vulcanization. <P>SOLUTION: This bead core for the tire comprises a laminate 5 formed by stacking, in the radial direction, multiple layers of annular parallel bodies 4 formed by laterally winding, parallel with each other, the bead wire 3 of rectangular shape in cross section. The parallel body 4 positioned on the radial outer side is displaced to a lateral one side, which is positioned on the outer side of the tire, more than the parallel body 4 positioned on the radial inner side when the tire is installed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、空気入りタイヤに使用するタイヤ用ビードコア及びそれを使用した空気入りタイヤに関し、更に詳しくは、捩れ及び形崩れを抑制し、操縦安定性を向上するようにしたタイヤ用ビードコア及び空気入りタイヤに関する。   The present invention relates to a bead core for a tire used for a pneumatic tire and a pneumatic tire using the same, and more specifically, a bead core for a tire and a pneumatic tire that suppresses torsion and deformation and improves steering stability. Regarding tires.

リムに対する嵌合性を確保するため、空気入りタイヤのビード部にはビードコアが埋設されている。このようなビードコアは、通常、ゴム被覆した断面円形あるいは楕円形のビードワイヤを断面円形状や六角形状に巻き重ねたり、あるいは断面四角形状に撚り合わせた構造になっている。   A bead core is embedded in the bead portion of the pneumatic tire in order to ensure fitability to the rim. Such a bead core usually has a structure in which a rubber-coated circular or elliptical bead wire is wound in a circular or hexagonal cross section or twisted into a rectangular cross section.

上記断面円形状のビードワイヤを使用したビードコアは、断面形状において隣接するビードワイヤ同士が被覆ゴムを介して点接触になるため、高速走行中のコーナリング時に大きな横力が加わり、タイヤに大きな捩れ力が作用すると、ビードコアに捩れが発生し、その結果、リムに装着したビード部が捩れるため、操縦安定性が低下する。   The bead core using the above-described circular bead wire has a point contact between the adjacent bead wires in the cross-sectional shape via the covering rubber, so that a large lateral force is applied during cornering during high-speed driving, and a large torsional force acts on the tire. Then, the bead core is twisted, and as a result, the bead portion attached to the rim is twisted, so that the steering stability is lowered.

そこで、従来、断面長方形などの方形状のビードワイヤを使用することが提案されている（例えば、特許文献１，２，３参照）。このような断面方形状のビードワイヤを幅方向に並列に巻回した環状の並列体を径方向に複数層積層した積層体からビードコアを構成することにより、ビードワイヤ同士の接触面積を増加させ、それによりビードコアの捩れを抑制し、操縦安定性を高めることができる。   Therefore, conventionally, it has been proposed to use a rectangular bead wire having a rectangular cross section (see, for example, Patent Documents 1, 2, and 3). By constructing a bead core from a laminated body in which a plurality of annular parallel bodies each having a rectangular cross-sectional shape wound in parallel in the width direction are laminated in the radial direction, the contact area between the bead wires is increased, thereby It is possible to suppress the twist of the bead core and improve the handling stability.

しかしながら、上述したビードコアは、いずれも加硫後のタイヤにおいて形状に崩れが発生しており、その結果、設計時に意図したビードコアとしての締め付け機能を効果的に発揮しておらず、形崩れが操縦安定性を阻害する原因の一因になっていた。
特開平９−６６７１２号公報 特開平１０−９５２１０号公報 特開昭４９−１１９３０１号公報 However, all the bead cores described above have collapsed in the shape of the vulcanized tire, and as a result, the intended tightening function as the bead core at the time of design has not been effectively demonstrated, and the deformation is not controlled. It contributed to the cause of inhibiting stability.
JP-A-9-66712 JP-A-10-95210 JP-A 49-119301

本発明の目的は、捩れ及び形崩れを抑制し、操縦安定性を向上することが可能なタイヤ用ビードコア及びそれを使用した空気入りタイヤを提供することにある。   An object of the present invention is to provide a bead core for a tire that can suppress twisting and deformation and improve steering stability, and a pneumatic tire using the same.

上記目的を達成する本発明のタイヤ用ビードコアは、断面方形状のビードワイヤを幅方向に並列に巻回した環状の並列体を径方向に複数層積層した積層体からなるタイヤ用ビードコアにおいて、径方向外側に位置する並列体を径方向内側に位置する並列体より、タイヤ取付時にタイヤ外側となる幅方向一方側にずらして配置したことを特徴とする。   A tire bead core according to the present invention that achieves the above object is a tire bead core comprising a laminate in which a plurality of annular parallel bodies each having a rectangular cross-sectional shape wound in parallel in the width direction are laminated in the radial direction. The parallel body located on the outer side is arranged to be shifted from the parallel body located on the radially inner side to one side in the width direction which becomes the tire outer side when the tire is attached.

本発明の空気入りタイヤは、上記タイヤ用ビードコアをビード部に埋設したことを特徴とする。   The pneumatic tire of the present invention is characterized in that the tire bead core is embedded in a bead portion.

上述した本発明によれば、径方向外側に位置する並列体を幅方向一方側にずらして配置し、加硫時に変形を受け難い安定した断面形状に近づけるようにしたので、意図したビードコアの締め付け力を大きく低下させるような、加硫中のタイヤ用ビードコアの形崩れを抑制することができる。   According to the present invention described above, the parallel body located radially outward is shifted to one side in the width direction so as to approach a stable cross-sectional shape that is not easily deformed during vulcanization, so that the intended bead core tightening It is possible to suppress the deformation of the tire bead core during vulcanization that greatly reduces the force.

また、断面方形状のビードワイヤをタイヤ用ビードコアに使用することで、並列積層したビードワイヤ同士の接触面積を増加させることができるので、コーナリング時に作用する大きな横力に対するタイヤ用ビードコアの捩れを抑制することができる。従って、ビードコアの捩れ及び形崩れを抑制し、操縦安定性を向上することができる。   Also, by using a bead wire with a square cross-section for the tire bead core, the contact area between the bead wires laminated in parallel can be increased, so that the twist of the tire bead core against a large lateral force acting during cornering can be suppressed. Can do. Therefore, the twist and deformation of the bead core can be suppressed and the steering stability can be improved.

しかも、ビードコアとしての締め付け機能を効果的に発揮することができるので、走行中における耐リム外れ性を改善することも可能になる。   Moreover, since the tightening function as the bead core can be effectively exhibited, it is possible to improve the rim detachment resistance during running.

以下、本発明の実施の形態について添付の図面を参照しながら詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図１は本発明のタイヤ用ビードコアの一実施形態を空気入りタイヤのビード部に埋設した状態で示し、１はタイヤ用ビードコア、２は要部を示す空気入りタイヤ、２Ａはビード部である。なお、図示せぬが、空気入りタイヤ２は、タイヤ内側に配設されたカーカス層の端部がビードコア１の周りにタイヤ内側から外側に折り返され、トレッド部のカーカス層外周側には、複数のベルト層が設けられている。   FIG. 1 shows an embodiment of a tire bead core according to the present invention embedded in a bead portion of a pneumatic tire, wherein 1 is a tire bead core, 2 is a pneumatic tire showing essential parts, and 2A is a bead portion. Although not shown, the pneumatic tire 2 has an end portion of a carcass layer disposed inside the tire folded around the bead core 1 from the inside to the outside of the tire, The belt layer is provided.

タイヤ用ビードコア１は、断面長方形状の硬鋼線からなるビードワイヤ３を幅方向に隣接して並列に巻回した環状の並列体４を径方向に複数層積層した積層体５と、積層体５を被覆するゴム層６を備えている。   The tire bead core 1 includes a laminated body 5 in which a plurality of annular parallel bodies 4 in which bead wires 3 made of a hard steel wire having a rectangular cross section are wound in parallel in the width direction are laminated in a radial direction, and the laminated body 5 The rubber layer 6 which covers

積層体５は、断面長方形状の１本のビードワイヤ３を巻き重ねて構成され、各並列体４は、径方向外側に位置する並列体４程、ビード部２Ａに取り付けた時にタイヤ外側となる幅方向一方側（図の右側）にずらして配置され、概ね平行四辺形状になっている。   The laminated body 5 is configured by winding a single bead wire 3 having a rectangular cross section, and each parallel body 4 has a width that becomes the outer side of the tire when attached to the bead portion 2A by the parallel body 4 positioned radially outward. It is arranged so as to be shifted to one side of the direction (the right side of the figure) and has a substantially parallelogram shape.

ゴム層６は、成形・加硫時の形状保持、及びビード部２Ａにおいて周囲のゴムとの接着性を確保するためのものであり、従来、公知のゴムから構成されている。例えば、ＪＩＳ Ａ硬度が７１〜７５、１００℃における１００％モジュラスが３．５〜４．１ＭＰａ、１００℃での破断強度が６．９〜７．８ＭＰａ、１００℃における破断伸びが１７０〜２１０％のゴムを好ましく使用することができる。   The rubber layer 6 is used to maintain the shape during molding and vulcanization and to ensure adhesion with the surrounding rubber in the bead portion 2A, and is conventionally made of a known rubber. For example, JIS A hardness is 71 to 75, 100% modulus at 100 ° C. is 3.5 to 4.1 MPa, breaking strength at 100 ° C. is 6.9 to 7.8 MPa, breaking elongation at 100 ° C. is 170 to 210% These rubbers can be preferably used.

本発明者は、加硫後のビードコアの形崩れについて多数のタイヤを分解してその状況を調べ、鋭意検討した結果、以下のことを知見した。即ち、空気入りタイヤは、通常、金型にセットされた後、内圧を付与しながら加硫される。その際の内圧の力を受けて、巻き重ねたビードワイヤにずれが発生し、形崩れを起こすのである。   The present inventor has disassembled a large number of tires and examined the situation of the deformed shape of the bead core after vulcanization, and as a result of intensive studies, the inventors have found the following. That is, the pneumatic tire is usually vulcanized while being applied with an internal pressure after being set in a mold. In response to the force of the internal pressure at that time, the rolled bead wire is displaced, causing a collapse of the shape.

そこで、加硫後のタイヤにおいて型崩れしたビードコアの断面形状に着目した。形崩れしたビードコアは、タイヤ径方向にずれを伴う場合もあるが、いずれも径方向外側に巻き重ねたビードワイヤの列ほどタイヤ外側にずれた概ね平行四辺形状に形崩れしていた。これは加硫中にビードコアが安定した状態になろうとする結果であり、初めからこの安定した断面形状にしておけば、加硫中における形崩れを抑制することができるのである。   Therefore, attention was paid to the cross-sectional shape of the bead core that was deformed in the tire after vulcanization. Although the deformed bead core may be displaced in the tire radial direction, all of the bead wires wound in the radially outward direction have been deformed into a substantially parallelogram shape shifted toward the tire outer side. This is a result of the bead core trying to be in a stable state during vulcanization, and if the cross-sectional shape is made stable from the beginning, the deformation during vulcanization can be suppressed.

このような知見に基づいて、本発明では、上記のように径方向外側に位置する並列体４程幅方向一方側にずらして配置し、初めから安定した断面形状にしたのである。そのため、加硫中にタイヤ用ビードコア１が形崩れするを抑制することができ、その結果、意図したビードコアとしての締め付け機能を効果的に発揮することができる。   Based on such knowledge, in the present invention, the parallel bodies 4 positioned radially outward as described above are arranged so as to be shifted to one side in the width direction and have a stable cross-sectional shape from the beginning. Therefore, the tire bead core 1 can be prevented from being deformed during vulcanization, and as a result, the intended tightening function as the bead core can be effectively exhibited.

また、断面長方形状のビードワイヤ３をタイヤ用ビードコア１に使用することにより、並列積層したビードワイヤ３同士の接触面積を増加させることができるので、コーナリング時に大きな横力が加わった際のタイヤ用ビードコア１の捩れを抑制することができる。従って、タイヤ用ビードコア１の捩れ及び形崩れを抑制し、操縦安定性の改善が可能になる。   Moreover, since the contact area of the bead wires 3 laminated in parallel can be increased by using the bead wire 3 having a rectangular cross section for the tire bead core 1, the tire bead core 1 when a large lateral force is applied during cornering. Torsion can be suppressed. Therefore, the twist and deformation of the tire bead core 1 are suppressed, and the steering stability can be improved.

更に、ビードコアとしての締め付け機能を効果的に発揮することができるので、走行中における耐リム外れ性を高めることもできる。   Furthermore, since the tightening function as the bead core can be effectively exhibited, it is possible to improve the rim detachment resistance during traveling.

本発明において、ずれ量Ｄとしては、隣接する各並列体４において、径方向外側の並列体４を内側の並列体４に対して、ビードワイヤ幅Ｗの１０％〜５０％ずらすのが好ましい。即ち、径方向外側の並列体４の各ビードワイヤ３を内側の並列体４の対応する（同じ位置にある）各ビードワイヤ３に対し、ビードワイヤ幅Ｗの１０％〜５０％ずらすのである。   In the present invention, as the shift amount D, it is preferable to shift the radially outer parallel body 4 from 10% to 50% of the bead wire width W with respect to the inner parallel body 4 in each adjacent parallel body 4. That is, each bead wire 3 of the radially parallel parallel body 4 is shifted by 10% to 50% of the bead wire width W with respect to each corresponding bead wire 3 (in the same position) of the inner parallel body 4.

ずれ量Ｄがビードワイヤ幅Ｗの１０％未満であると、加硫中のタイヤ用ビードコア１の形崩れを効果的に抑制することが難しくなる。逆に５０％を超えると、ずれが大きくなりすぎて、ビードコアとしての機能を効果的に発揮することが難しくなる。より好ましくは、ビードワイヤ幅Ｗの２０％〜４０％ずらすのがよい。ビードワイヤ幅Ｗの２０％以上ずらすことにより、加硫時にタイヤ径方向の力が作用した際にタイヤ径方向にずれを招き難くすることもできる。   When the deviation amount D is less than 10% of the bead wire width W, it becomes difficult to effectively suppress the deformation of the tire bead core 1 during vulcanization. On the other hand, if it exceeds 50%, the deviation becomes too large, and it becomes difficult to effectively exhibit the function as a bead core. More preferably, the bead wire width W should be shifted by 20% to 40%. By shifting 20% or more of the bead wire width W, it is possible to make it difficult to cause a shift in the tire radial direction when a force in the tire radial direction is applied during vulcanization.

ビードワイヤ３は、上記実施形態では断面長方形状にしたが、それに代えて、正方形状や平行四辺形状、あるいは菱形状であってもよく、対向する２辺が平行な４角形であればよい。これらを総称して、本発明では方形状と定義する。また、４辺が曲率半径の大きな円弧からなる辺で構成され、実質的に対向する２辺が平行と言えるものも本発明の方形状に含まれるものとする。   The bead wire 3 has a rectangular cross section in the above embodiment, but may instead be a square, a parallelogram, or a rhombus, and may be a quadrangle whose two opposite sides are parallel. These are collectively referred to as a square shape in the present invention. In addition, the rectangular shape of the present invention includes four sides that are formed by arcs having a large radius of curvature and two substantially opposite sides can be said to be parallel.

タイヤ用ビードコア１は、積層体５全体をゴム層６で被覆する構成に代えて、図２に示すようにビードワイヤ３をゴム層６で被覆し、そのゴム被覆したビードワイヤ３を用いて構成するようにしてもよい。   The tire bead core 1 is constituted by covering the bead wire 3 with the rubber layer 6 as shown in FIG. 2 and using the rubber-coated bead wire 3 instead of the configuration in which the entire laminated body 5 is covered with the rubber layer 6. It may be.

また、タイヤ用ビードコア１は、上述したように径方向外側に位置する並列体４程、幅方向一方側にずらして配置するのが好ましいが、図３に一例を示すように、最も径方向内側に位置する並列体４Ａに対して、その外周側の２列の並列体４Ｂ，４Ｃを幅方向一方側にずらし、更にその外周側の最も径方向外側に位置する並列体４Ｄを並列体４Ｂ，４Ｃに対してずらすなど、径方向外側に位置する並列体４を径方向内側に位置する並列体４より幅方向一方側にずらして配置し、加硫時に変形を受け難い安定した断面形状に近づけるようにしたものであってもよい。   Further, the tire bead core 1 is preferably arranged so as to be shifted to the one side in the width direction as the parallel body 4 positioned on the radially outer side as described above, but as shown in an example in FIG. The parallel body 4A located on the outer peripheral side is shifted to one side in the width direction, and the parallel body 4D located on the outermost radial side on the outer peripheral side is further shifted to the parallel body 4B. The parallel body 4 positioned on the radially outer side is shifted to the one side in the width direction from the parallel body 4 positioned on the radially inner side, such as by shifting with respect to 4C, so as to approach a stable cross-sectional shape that is not easily deformed during vulcanization. It may be as described above.

本発明のタイヤ用ビードコア１は、いずれの空気入りタイヤにも好適に使用することができる。   The bead core 1 for tires of the present invention can be suitably used for any pneumatic tire.

タイヤサイズを１９５／６５Ｒ１５とし、図１に示すタイヤ用ビードコアを用いて製造した本発明タイヤと、本発明タイヤにおいてタイヤ用ビードコアを断面楕円形状のビードワイヤを用いた比較タイヤ１、比較タイヤ１においてずれ量Ｄを０にした比較タイヤ２、及び本発明においてずれ量Ｄを０にした従来タイヤをそれぞれ作製した。本発明タイヤ及び比較タイヤ１におけるずれ量Ｄは、ビードワイヤ幅Ｗの２０％である。   The tire of the present invention manufactured using the tire bead core shown in FIG. 1 with a tire size of 195 / 65R15, the tire bead core of the present invention, and the comparison tire 1 using a bead wire having an elliptical cross section are shifted in comparison tire 1 The comparative tire 2 in which the amount D was set to 0 and the conventional tire in which the shift amount D was set to 0 in the present invention were prepared. The deviation D in the tire of the present invention and the comparative tire 1 is 20% of the bead wire width W.

各試験タイヤは、１層のカーカス層の両端部がビードコアの周りにタイヤ内側から外側に折り返され、トレッド部のカーカス層外周側には２層のベルト層を配置した構成である。   Each test tire has a configuration in which both end portions of one carcass layer are folded around the bead core from the inside to the outside of the tire, and two belt layers are arranged on the outer periphery side of the carcass layer in the tread portion.

これら各試験タイヤを以下に示す測定方法により、操縦安定性の評価試験を行ったところ、表１に示す結果を得た。
操縦安定性
各試験タイヤをリムサイズ１５×６ＪＪのリムに装着し、空気圧を２００kPa にして排気量２０００ccの車両に取り付け、乾燥路テストコースにおいて、テストドライバーによるフィーリング試験を実施し、その結果を従来タイヤを１００とする指数値で示した。この値が大きい程、操縦安定性が優れている。 When each of these test tires was subjected to a steering stability evaluation test by the measurement method shown below, the results shown in Table 1 were obtained.
Steering stability Each test tire is mounted on a rim with a rim size of 15 x 6 JJ, mounted on a vehicle with a displacement of 2000 cc with an air pressure of 200 kPa, and a feeling test is conducted by a test driver on a dry road test course. The conventional tire is indicated by an index value of 100. The larger this value, the better the steering stability.

Figure 2005145082
表１から、本発明タイヤは、操縦安定性を改善できることがわかる。
Figure 2005145082
 From Table 1, it can be seen that the tire of the present invention can improve steering stability.

本発明のタイヤ用ビードコアの一実施形態を空気入りタイヤのビード部に埋 設して取り付けた状態で示す断面図である。1 is a cross-sectional view showing an embodiment of a tire bead core according to the present invention in a state where the bead core is embedded and attached to a bead portion of a pneumatic tire. 本発明のタイヤ用ビードコアの他の実施形態を空気入りタイヤのビード部に 埋設して取り付けた状態で示す断面図である。FIG. 6 is a cross-sectional view showing another embodiment of a tire bead core according to the present invention in a state where it is embedded in and attached to a bead portion of a pneumatic tire. 本発明のタイヤ用ビードコアの更に他の実施形態を空気入りタイヤのビード 部に埋設して取り付けた状態で示す断面図である。FIG. 6 is a cross-sectional view showing still another embodiment of a tire bead core according to the present invention in a state where it is buried in and attached to a bead portion of a pneumatic tire.

符号の説明Explanation of symbols

１ タイヤ用ビードコア ２ 空気入りタイヤ
２Ａ ビード部 ３ ビードワイヤ
４ 並列体 ５ 積層体
６ ゴム層
DESCRIPTION OF SYMBOLS 1 Bead core for tires 2 Pneumatic tire 2A Bead part 3 Bead wire 4 Parallel body 5 Laminated body 6 Rubber layer

Claims (8)

断面方形状のビードワイヤを幅方向に並列に巻回した環状の並列体を径方向に複数層積層した積層体からなるタイヤ用ビードコアにおいて、径方向外側に位置する並列体を径方向内側に位置する並列体より、タイヤ取付時にタイヤ外側となる幅方向一方側にずらして配置したタイヤ用ビードコア。   In a tire bead core composed of a laminated body in which a plurality of annular parallel bodies each having a rectangular cross-section wound in parallel in the width direction are laminated in the radial direction, the parallel body located on the radially outer side is located on the radially inner side. A tire bead core that is arranged so as to be shifted from the parallel body to one side in the width direction which is the outer side of the tire when the tire is attached. 径方向外側に位置する並列体程、前記幅方向一方側にずらして配置した請求項１に記載のタイヤ用ビードコア。   The tire bead core according to claim 1, wherein the parallel body positioned radially outward is shifted to one side in the width direction. 隣接する各並列体において、径方向外側の並列体を内側の並列体に対して、ビードワイヤ幅の１０％〜５０％ずらした請求項２に記載のタイヤ用ビードコア。   The bead core for a tire according to claim 2, wherein in each adjacent parallel body, the radially outer parallel body is shifted by 10% to 50% of the bead wire width with respect to the inner parallel body. 隣接する各並列体において、径方向外側の並列体を内側の並列体に対して、ビードワイヤ幅の２０％〜４０％ずらした請求項３に記載のタイヤ用ビードコア。   The tire bead core according to claim 3, wherein in each adjacent parallel body, the radially outer parallel body is shifted by 20% to 40% of the bead wire width with respect to the inner parallel body. １本のビードワイヤを巻回して前記積層体を構成した請求項１，２，３または４に記載のタイヤ用ビードコア。   The bead core for tire according to claim 1, 2, 3 or 4, wherein the laminated body is configured by winding one bead wire. 前記積層体をゴム被覆した請求項１，２，３，４または５に記載のタイヤ用ビードコア。   The tire bead core according to claim 1, wherein the laminate is covered with rubber. 前記ビードワイヤをゴム被覆した請求項１，２，３，４または５に記載のタイヤ用ビードコア。   6. The tire bead core according to claim 1, wherein the bead wire is rubber-coated. 請求項１，２，３，４，５，６または７に記載のタイヤ用ビードコアをビード部に埋設した空気入りタイヤ。   A pneumatic tire in which the bead core for tire according to claim 1, 2, 3, 4, 5, 6 or 7 is embedded in a bead portion.
JP2003380658A 2003-11-11 2003-11-11 Tire bead core and pneumatic tire Expired - Fee Related JP4367914B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008143288A1 (en) * 2007-05-21 2008-11-27 Bridgestone Corporation Pneumatic tire
JP2009126262A (en) * 2007-11-21 2009-06-11 Bridgestone Corp Run flat tire
JP2011131866A (en) * 2009-12-25 2011-07-07 Bridgestone Corp Pneumatic tire
KR101069319B1 (en) 2008-12-02 2011-10-05 한국타이어 주식회사 Heavy duty vehicle tire improved bead member
JP2013129234A (en) * 2011-12-20 2013-07-04 Bridgestone Corp Bead core and tire using the same
WO2018235507A1 (en) * 2017-06-19 2018-12-27 株式会社ブリヂストン Bead core, production method therefor, and pneumatic tire

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008143288A1 (en) * 2007-05-21 2008-11-27 Bridgestone Corporation Pneumatic tire
JP2009126262A (en) * 2007-11-21 2009-06-11 Bridgestone Corp Run flat tire
KR101069319B1 (en) 2008-12-02 2011-10-05 한국타이어 주식회사 Heavy duty vehicle tire improved bead member
JP2011131866A (en) * 2009-12-25 2011-07-07 Bridgestone Corp Pneumatic tire
JP2013129234A (en) * 2011-12-20 2013-07-04 Bridgestone Corp Bead core and tire using the same
WO2018235507A1 (en) * 2017-06-19 2018-12-27 株式会社ブリヂストン Bead core, production method therefor, and pneumatic tire

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