JP4968824B2 - Method for molding tire bead member - Google Patents

Method for molding tire bead member Download PDF

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JP4968824B2
JP4968824B2 JP2006207538A JP2006207538A JP4968824B2 JP 4968824 B2 JP4968824 B2 JP 4968824B2 JP 2006207538 A JP2006207538 A JP 2006207538A JP 2006207538 A JP2006207538 A JP 2006207538A JP 4968824 B2 JP4968824 B2 JP 4968824B2
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bead
rubber
stiffener
cable
cover rubber
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JP2008030345A (en
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将介 浪山
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Bridgestone Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
    • B29D2030/482—Applying fillers or apexes to bead cores

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Description

本発明はタイヤ用ビード部材の成型方法（以下、単に「ビード部材」および「成型方法」とも称する）に関し、詳しくは、ケーブルビードを用いたタイヤ用ビード部材の成型方法に関する。   The present invention relates to a method for molding a tire bead member (hereinafter, also simply referred to as “bead member” and “molding method”), and more particularly, to a method for molding a tire bead member using a cable bead.

近年、高性能空気入りタイヤにおいては、ビードコアとしてケーブルビードが一般的に用いられるようになってきている。ケーブルビードとは、芯コードの周囲に複数本のコードが螺旋状に巻回されてなる構成のビードコアであり、カーカス等を介してケーブルビードに伝達される力をケーブルビード自体の捩れや巻回されたコードの巻き締まり、緩み等により吸収することができるため、ケーブルビードの適用により、この力が吸収しきれないことに起因して生ずるタイヤユニフォミティの低下やビードワイヤのジョイント部における故障の発生等の問題を解消することが可能となる。   In recent years, cable beads have been generally used as bead cores in high performance pneumatic tires. A cable bead is a bead core having a configuration in which a plurality of cords are spirally wound around a core cord, and the force transmitted to the cable bead via a carcass or the like is twisted or wound around the cable bead itself. The cable can be absorbed by tightening, loosening, etc., so the cable bead makes it impossible to absorb this force, resulting in a decrease in tire uniformity and failure of the bead wire joint. It becomes possible to solve the problem.

一方、ビードコアを成型するに際しては、通常、ゴムをインシュレーション被覆したスチールコードを巻取って形成するのが最も一般的な方法であるが、ケーブルビードの場合には、ゴム被覆されていない裸スチールコードを巻取って形成する方法が一般的である。したがって、ケーブルビードを用いたタイヤでは、ケーブルビードを構成するコードとプライコードとが直接接触することを防ぐ目的で、ケーブルビード全体をゴム部材で被覆することが必要となる。そのため従来は、図２の断面図に示すように、ケーブルビード１１の外周にカバーゴム（ゴムシート）１２を被覆して（図中の（ａ））、その上にスティフナーゴム１３を貼付ける（図中の（ｂ））ことにより、ビード部材２０（図中の（ｃ））を得る成型方法が用いられていた。   On the other hand, when molding a bead core, the most common method is usually to wind a steel cord coated with insulation of rubber, but in the case of cable beads, bare steel without rubber coating is used. A method of winding and forming a cord is common. Therefore, in a tire using a cable bead, it is necessary to cover the entire cable bead with a rubber member in order to prevent the cord constituting the cable bead from directly contacting the ply cord. Therefore, conventionally, as shown in the cross-sectional view of FIG. 2, the outer periphery of the cable bead 11 is covered with a cover rubber (rubber sheet) 12 ((a) in the figure), and a stiffener rubber 13 is pasted thereon ( A molding method for obtaining the bead member 20 ((c) in the figure) by (b) in the figure has been used.

また、ビード部材の成型方法に関しては、例えば、特許文献１に、ビード要素を複数回巻回し、その内周面に密着してゴムシート状物を配置し、その両端をビード要素の側面に密着するよう折曲し、折曲によりビード要素の両側面から円周上に突出したゴムシート状物を接合し、ビード要素の円周上に略三角形状のフィラー部を形成するタイヤ用ビードの製造方法が開示されている。また、特許文献２には、ゴム状シート材料より構成されビードの周囲より長い全巾を有し、かつ両端にフィラーを構成する略三角状の塊状体を設け、その両側の巾をビードの三面の長さと略同じとしたタイヤ用ビードフィラーが開示されている。   Regarding the method for molding the bead member, for example, in Patent Document 1, a bead element is wound a plurality of times, a rubber sheet is placed in close contact with the inner peripheral surface, and both ends thereof are in close contact with the side surface of the bead element. Manufacturing a bead for a tire that bends to form a substantially triangular filler portion on the circumference of the bead element by joining the rubber sheet-like objects protruding on the circumference from both sides of the bead element by bending. A method is disclosed. Further, Patent Document 2 is provided with a substantially triangular block that is formed of a rubber-like sheet material and has a full width longer than the periphery of the bead and that constitutes a filler at both ends, and the widths on both sides are arranged on three sides of the bead. A tire bead filler having a length substantially equal to the length of the tire is disclosed.

さらに、特許文献３には、ビードフィラー及び環状ビードを備えたビード組立体を形成する方法であって、１対の長手方向端部部材とその間の凹所とを有するストリップを押出成形し；強固な環状の支持用構造の周りにこのストリップを巻き；連結された環状の弾性部材を形成するようにストリップの切断端部を一緒に接合し；凹所に半径方向で揃えて環状弾性部材の周りに環状ビードを置き；分割式の拡張可能なマンドレルの拡張により凹所内にビードを固定し；連結された環状弾性部材内から強固な環状支持構造を引き抜き；環状ビード組立体を形成するようにビードの周りで２個の長手方向端部部材を回転させ互いに接触させることを含む方法が開示されている。さらにまた、特許文献４には、ケーブルコアと、その周りを覆うカバーゴム層と、その外周側に配設したビードフィラーゴムとからなるタイヤ用ビード芯構体を形成するに当り、ビードフィラーゴムとカバーゴム層とを予め一体に構体するとともに、カバーゴム層上のビードフィラーゴムと隣接する位置にケーブルコアを配置し、次いで、カバーゴム層でケーブルコアを巻込む技術が開示されている。
特開昭６０−３１６６２号公報（特許請求の範囲，［図１］等） 特開昭６３−３２００２号公報（特許請求の範囲等） 特開平７−２１４６９４号公報（特許請求の範囲等） 特開平７−３４４４６８号公報（特許請求の範囲等） Further, Patent Document 3 discloses a method of forming a bead assembly including a bead filler and an annular bead, in which a strip having a pair of longitudinal end members and a recess therebetween is extruded; Wrap this strip around an annular support structure; join the cut ends of the strip together to form a linked annular elastic member; Place the bead into the recess by extending the split-type expandable mandrel; pull out the strong annular support structure from within the connected annular elastic member; bead to form the annular bead assembly A method comprising rotating two longitudinal end members around and in contact with each other. Furthermore, in Patent Document 4, in forming a bead core structure for a tire comprising a cable core, a cover rubber layer covering the periphery of the cable core, and a bead filler rubber disposed on the outer peripheral side, A technology is disclosed in which a cover rubber layer is integrally formed in advance, a cable core is disposed at a position adjacent to the bead filler rubber on the cover rubber layer, and then the cable core is wound around the cover rubber layer.
JP-A-60-31662 (Claims, [FIG. 1], etc.) JP-A-63-32002 (Claims etc.) Japanese Patent Laid-Open No. 7-214694 (Claims) Japanese Patent Laid-Open No. 7-344468 (Claims)

しかしながら、図２に示すような従来の成型方法では、ケーブルビードが断面略円形状でかつ円環状であることから人手によるゴム部材の貼付作業が必要となり、非効率であるという問題があった。また、スティフナーゴム１３の下部は、その形状上、手ロール等による均一な圧着が困難であるため、カバーゴム１２に対する貼着時において層間エアの核となりやすいという難点もあった。製品内でのこのエア溜りは、カーカス内部の位置となることから手直しが困難であり、航空機用タイヤのような高性能タイヤでは即スクラップ扱いになるような重欠陥となる。したがって、ケーブルビードとスティフナーゴムとの組立て成型を、エア入り等の不良を生ずることなく、かつ、効率良く行うことのできる技術が求められていた。   However, in the conventional molding method as shown in FIG. 2, the cable bead has a substantially circular cross section and an annular shape, which requires a manual rubber member affixing operation, which is inefficient. Further, since the lower part of the stiffener rubber 13 is difficult to be uniformly pressed by a hand roll or the like due to its shape, there is also a problem that it is likely to become a core of interlayer air when sticking to the cover rubber 12. This air accumulation in the product is difficult to repair because it is located inside the carcass, and becomes a serious defect that can be handled as scrap immediately in high-performance tires such as aircraft tires. Therefore, there has been a demand for a technique capable of efficiently assembling and molding the cable bead and the stiffener rubber without causing defects such as air entering.

そこで本発明の目的は、上記問題を解消して、ケーブルビードを用いたビード部材を、エア入り等の不良を生ずることなく、かつ、効率良く成型することのできるタイヤ用ビード部材の成型方法を提供することにある。   Accordingly, an object of the present invention is to provide a method for molding a bead member for a tire that can solve the above-mentioned problems and can efficiently mold a bead member using a cable bead without causing defects such as air entry. It is to provide.

上記課題を解決するために、本発明者は鋭意検討した結果、下記構成とすることにより従来に比し高効率に、かつ、エア入り不良の問題なしで、上記タイヤ用ビード部材を成型することが可能となることを見出して、本発明を完成するに至った。   In order to solve the above-mentioned problems, the present inventor has intensively studied to form the above-described tire bead member with the following configuration with higher efficiency than before and without the problem of poor air entry. As a result, the present invention has been completed.

即ち、本発明のタイヤ用ビード部材の成型方法は、円環状のケーブルビードと、該ケーブルビードの全外周を被覆するカバーゴムと、該カバーゴムの外面に、外周側に向かって配設されたスティフナーゴムと、からなるタイヤ用ビード部材の成型方法において、
前記カバーゴムおよびスティフナーゴムを同時押出により一体成形して、該スティフナーゴムがタイヤ軸方向に２分割されて該カバーゴムの幅方向両端部にそれぞれ配置されてなる中間部材を得る押出工程と、該中間部材のカバーゴム側により前記ケーブルビードの全外周を被包するとともに、該中間部材の幅方向両端部の２分割スティフナーゴムを互いに接合する接合工程と、を含み、該接合工程に先立って、該２分割スティフナーゴムの接合面にリッジを設けることを特徴とするものである。 That is, in the method for molding a tire bead member of the present invention, an annular cable bead, a cover rubber covering the entire outer periphery of the cable bead, and an outer surface of the cover rubber are disposed toward the outer peripheral side. In a method for molding a tire bead member comprising stiffener rubber,
An extrusion process in which the cover rubber and the stiffener rubber are integrally formed by coextrusion to obtain an intermediate member in which the stiffener rubber is divided into two in the tire axial direction and arranged at both ends in the width direction of the cover rubber; Enveloping the entire outer periphery of the cable bead by the cover rubber side of the intermediate member, and joining the two divided stiffener rubbers at both ends in the width direction of the intermediate member, prior to the joining step, A ridge is provided on the joint surface of the two-part stiffener rubber.

本発明によれば、カバーゴムとスティフナーゴムとを同時押出により一体成形するものとしたことで、押出ゴムの部材点数および組立ての作業工数をいずれも削減することができ、結果として、従来に比し大幅にビード部材の成型時間を短縮して、生産性を向上することが可能となった。また、作業工数の削減に伴い、加工費の削減というメリットも得ることができる。さらに、２分割スティフナーゴムの接合面にリッジを設けたことで、接合時にエアを確実に排出させることができ、従来のようなエア溜りの発生の問題についても解消することができる。したがって本発明によれば、ケーブルビードを用いたビード部材を、高品質に、かつ、生産性良く成型することが可能となる。ケーブルビードは断面略円形状であることから、従来の断面多角形状のビードコアに比べてエア入りしやすいため、本発明の適用は極めて有効である。   According to the present invention, since the cover rubber and the stiffener rubber are integrally formed by simultaneous extrusion, both the number of members of the extruded rubber and the assembly man-hour can be reduced. However, it has become possible to significantly reduce the molding time of the bead member and improve productivity. In addition, with the reduction of work man-hours, the merit of reduction of processing costs can be obtained. Further, by providing a ridge on the joint surface of the two-part stiffener rubber, air can be reliably discharged at the time of joining, and the conventional problem of air accumulation can be solved. Therefore, according to the present invention, a bead member using a cable bead can be molded with high quality and high productivity. Since the cable bead has a substantially circular cross section, it is easier to enter air than a conventional bead core having a polygonal cross section, so that the application of the present invention is extremely effective.

以下、本発明の好適な実施の形態について詳細に説明する。
本発明は、円環状のケーブルビードと、ケーブルビードを被覆するカバーゴムと、カバーゴムの外面に、外周側に向かって配設されたスティフナーゴムと、からなるタイヤ用ビード部材の成型方法の改良に係るものである。 Hereinafter, preferred embodiments of the present invention will be described in detail.
The present invention provides an improved method for molding a tire bead member comprising an annular cable bead, a cover rubber covering the cable bead, and a stiffener rubber disposed on the outer surface of the cover rubber toward the outer peripheral side. It is related to.

図１に、本発明のタイヤ用ビード部材の成型方法に係る概略説明図を示す。本発明においては、まず、図中の（ａ）に示すように、カバーゴム２およびスティフナーゴム３を同時押出により一体成形して、スティフナーゴム３がタイヤ軸方向に２分割されて（図中の符号３ａ，３ｂ）カバーゴム２の幅方向両端部にそれぞれ配置されてなる中間部材４を得る（押出工程）。すなわち、同時押出によりカバーゴム２およびスティフナーゴム３の二部材（二種のゴム）を一部材として形成することで、部材点数を削減することができ、同時に部材の組立作業工数、さらにはこれに伴う加工費についても削減することができる。また、同時押出によりこれら二部材をあらかじめ一体として成形することで、従来問題であったカバーゴム／スティフナーゴム間における層間エア核を排除することができるので、エア溜り重欠陥の発生を防止することが可能となる。   In FIG. 1, the schematic explanatory drawing which concerns on the shaping | molding method of the bead member for tires of this invention is shown. In the present invention, first, as shown in (a) in the figure, the cover rubber 2 and the stiffener rubber 3 are integrally formed by simultaneous extrusion, and the stiffener rubber 3 is divided into two in the tire axial direction (in the figure). Reference numerals 3a and 3b) Obtain intermediate members 4 arranged at both ends in the width direction of the cover rubber 2 (extrusion step). That is, by forming two members (two types of rubber) of the cover rubber 2 and the stiffener rubber 3 as one member by simultaneous extrusion, the number of members can be reduced, and at the same time, the number of man-hours for assembling the members, The associated processing costs can also be reduced. In addition, by forming these two members as a single unit by coextrusion in advance, it is possible to eliminate the interlayer air core between the cover rubber and the stiffener rubber, which has been a problem in the past, thus preventing the occurrence of air accumulation defects. Is possible.

次いで、図中の（ｂ）に示すように、この中間部材４のカバーゴム２側によりケーブルビード１を被包するとともに、中間部材４の幅方向両端部の２分割スティフナーゴム３ａ，３ｂを互いに接合する（接合工程）。この際、接合工程に先立って、リッジローラ等により、２分割スティフナーゴム３ａ，３ｂの接合面にリッジ５を設けておくことで、接合工程において２分割スティフナーゴム３ａ，３ｂを接合する際に、内部のエアを接合面から確実に排出することが可能となる。   Next, as shown in (b) in the figure, the cable bead 1 is encapsulated by the cover rubber 2 side of the intermediate member 4, and the two-divided stiffener rubbers 3a and 3b at both ends in the width direction of the intermediate member 4 are connected to each other. Join (joining process). At this time, prior to the joining step, by providing the ridge 5 on the joining surface of the two-part stiffener rubbers 3a and 3b with a ridge roller or the like, when joining the two-part stiffener rubbers 3a and 3b in the joining step, The internal air can be reliably discharged from the joint surface.

なお、スティフナーゴムの接合面に設けるリッジ５としては、接合時にエアの排出をスムーズにできるものであれば、形状や寸法、ピッチ等については特に制限されるものではなく、どのように配設するものであってもよい。また、カバーゴム２およびスティフナーゴム３からなる中間部材４の具いたい敵形状については、特に制限されるものではないが、図示するように、ケーブルビード１を被包するスティフナーゴム３の配置部分がケーブルビード１の円周に沿う円弧形状に形成されていることが好ましく、これにより、ケーブルビード１とカバーゴム２との間におけるエアの残留をより確実に防止することができる。   The ridge 5 provided on the joint surface of the stiffener rubber is not particularly limited in terms of shape, size, pitch, etc., as long as it can smoothly discharge air at the time of joining. It may be a thing. Further, the enemy shape of the intermediate member 4 composed of the cover rubber 2 and the stiffener rubber 3 is not particularly limited. However, as shown in the drawing, the arrangement portion of the stiffener rubber 3 enclosing the cable bead 1 is not limited. It is preferable that the cable bead 1 is formed in an arc shape along the circumference of the cable bead 1, whereby the remaining of air between the cable bead 1 and the cover rubber 2 can be more reliably prevented.

また、本発明によれば、押出工程を行うための押出機と接合工程を行うための組立フォーマとを連設したダイレクト成型方法を採用することで、作業工程を従来の四工程（部材準備：二工程および貼付（組立）：二工程）から計一工程に削減することができ、より短時間で効率的な成型作業が可能となる。またこの場合、従来の中間材料在庫を一掃することができるメリットもあり、この点でもコスト性が向上する。   In addition, according to the present invention, by adopting a direct molding method in which an extruder for performing an extrusion process and an assembly former for performing a joining process are employed, the work process is a conventional four processes (member preparation: Two processes and sticking (assembly): two processes) can be reduced to a total of one process, and an efficient molding work can be performed in a shorter time. Further, in this case, there is a merit that the conventional intermediate material stock can be wiped out, and the cost is improved in this respect as well.

本発明においては、上記押出工程および接合工程によりビード部材の成型を行うものであればよく、これにより本発明の所期の効果を得ることができるものであり、それ以外の点については常法に従い実施することができ、特に制限されるものではない。   In this invention, what is necessary is just to perform a shaping | molding of a bead member by the said extrusion process and a joining process, and this can acquire the effect of this invention, About a point other than that, it is a conventional method Can be carried out according to the present invention, and is not particularly limited.

以下、本発明を、実施例を用いてより詳細に説明する。
（実施例）
円環状のケーブルビードと、ケーブルビードを被覆するカバーゴムと、カバーゴムの外面に、外周側に向かって配設されたスティフナーゴムとからなるタイヤ用ビード部材を、図１に示す方法で成型した。 Hereinafter, the present invention will be described in more detail with reference to examples.
(Example)
A tire bead member made of an annular cable bead, a cover rubber covering the cable bead, and a stiffener rubber disposed on the outer surface of the cover rubber toward the outer peripheral side was molded by the method shown in FIG. .

まず、図示するように、カバーゴム２およびスティフナーゴム３を、二層押出機を用いた同時押出により一体成形して中間部材４を得、この中間部材４の２分割スティフナーゴム３ａ，３ｂの接合面に、リッジローラを用いてリッジ５を設けた（図中の（ａ））。次いで、手作業により、中間部材４のカバーゴム２側によりケーブルビード１を被包し、２分割スティフナーゴム３ａ，３ｂを互いに接合して、ビード部材を得た（図中の（ｂ））。   First, as shown in the figure, the cover rubber 2 and the stiffener rubber 3 are integrally formed by simultaneous extrusion using a two-layer extruder to obtain an intermediate member 4, and the intermediate member 4 is joined to the two-part stiffener rubbers 3a and 3b. A ridge 5 was provided on the surface using a ridge roller ((a) in the figure). Subsequently, the cable bead 1 was encapsulated by the cover rubber 2 side of the intermediate member 4 by manual work, and the two-divided stiffener rubbers 3a and 3b were joined together to obtain a bead member ((b) in the figure).

（従来例）
実施例と同様のタイヤ用ビード部材を、図２に示す方法で成型した。まず、カバーゴム１２およびスティフナーゴム１３を、押出機を用いた押出成形によりそれぞれ別個に作製した。次いで、手作業により、図示するように、カバーゴム１２によりケーブルビード１１を被覆して（図中の（ａ））、その後、カバーゴム１２の外周にスティフナーゴム１３を接合することにより、ビード部材を得た（（図中の（ｂ））。 (Conventional example)
A tire bead member similar to that of the example was molded by the method shown in FIG. First, the cover rubber 12 and the stiffener rubber 13 were separately produced by extrusion molding using an extruder. Next, as shown in the figure, the cable bead 11 is covered with a cover rubber 12 by manual work ((a) in the figure), and then a stiffener rubber 13 is joined to the outer periphery of the cover rubber 12 to thereby obtain a bead member. ((B) in the figure) was obtained.

実施例および従来例におけるビード部材の生産性および品質を評価したところ、実施例においては従来例に比し生産性が良好で、得られたビード部材の品質についても従来例に比し優れていることが確認できた。   The productivity and quality of the bead member in the example and the conventional example were evaluated. In the example, the productivity was better than the conventional example, and the quality of the obtained bead member was also superior to the conventional example. I was able to confirm.

本発明の一実施の形態に係るタイヤ用ビード部材の成型方法を示す概略説明図である。It is a schematic explanatory drawing which shows the molding method of the bead member for tires which concerns on one embodiment of this invention. 従来のタイヤ用ビード部材の成型方法を示す概略説明図である。It is a schematic explanatory drawing which shows the shaping | molding method of the conventional bead member for tires.

符号の説明Explanation of symbols

１，１１ ケーブルビード
２，１２ カバーゴム
３，１３ スティフナーゴム
４ 中間部材
５ リッジ 1,11 Cable beads 2,12 Cover rubber 3,13 Stiffener rubber 4 Intermediate member 5 Ridge

Claims (1)

円環状のケーブルビードと、該ケーブルビードの全外周を被覆するカバーゴムと、該カバーゴムの外面に、外周側に向かって配設されたスティフナーゴムと、からなるタイヤ用ビード部材の成型方法において、
前記カバーゴムおよびスティフナーゴムを同時押出により一体成形して、該スティフナーゴムがタイヤ軸方向に２分割されて該カバーゴムの幅方向両端部にそれぞれ配置されてなる中間部材を得る押出工程と、該中間部材のカバーゴム側により前記ケーブルビードの全外周を被包するとともに、該中間部材の幅方向両端部の２分割スティフナーゴムを互いに接合する接合工程と、を含み、該接合工程に先立って、該２分割スティフナーゴムの接合面にリッジを設けることを特徴とするタイヤ用ビード部材の成型方法。 In a method for molding a tire bead member, comprising an annular cable bead, a cover rubber covering the entire outer periphery of the cable bead, and a stiffener rubber disposed on the outer surface of the cover rubber toward the outer peripheral side ,
An extrusion process in which the cover rubber and the stiffener rubber are integrally formed by coextrusion to obtain an intermediate member in which the stiffener rubber is divided into two in the tire axial direction and arranged at both ends in the width direction of the cover rubber; Enveloping the entire outer periphery of the cable bead by the cover rubber side of the intermediate member, and joining the two divided stiffener rubbers at both ends in the width direction of the intermediate member, prior to the joining step, A method for molding a tire bead member, wherein a ridge is provided on a joint surface of the two-part stiffener rubber.
JP2006207538A 2006-07-31 2006-07-31 Method for molding tire bead member Expired - Fee Related JP4968824B2 (en)

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JP4968824B2 true JP4968824B2 (en) 2012-07-04

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Publication number Priority date Publication date Assignee Title
FR2953444B1 (en) * 2009-12-09 2012-01-13 Michelin Soc Tech METHOD FOR MANUFACTURING A RING FOR CARRYING OUT A TIRE
KR101933391B1 (en) 2017-03-23 2018-12-31 인미환 Bead insulation covering method on bead wire and the bead member manufactured by the method

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JPS6031662B2 (en) * 1977-10-17 1985-07-23 トクセン工業株式会社 Method for manufacturing tire beads
JPS60180604U (en) * 1984-12-26 1985-11-30 トクセン工業株式会社 Bead filler for tires
JP3204747B2 (en) * 1992-08-04 2001-09-04 株式会社ブリヂストン Rubber contour for pneumatic tire and method for producing rubber contour for pneumatic tire
JP3445309B2 (en) * 1993-06-07 2003-09-08 株式会社ブリヂストン Method of forming bead core structure for tire and method of manufacturing pneumatic tire using the method
US5350470A (en) * 1993-11-30 1994-09-27 Bridgestone Corporation Method of forming tire bead assembly
JP2003039570A (en) * 2001-07-30 2003-02-13 Sumitomo Rubber Ind Ltd Pneumatic tire and method for manufacturing the same
JP2006035948A (en) * 2004-07-23 2006-02-09 Sumitomo Rubber Ind Ltd Bead core with apex, pneumatic tire formed by using the same

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