JPH05193313A - Bead core of tire - Google Patents
Bead core of tireInfo
- Publication number
- JPH05193313A JPH05193313A JP3050506A JP5050691A JPH05193313A JP H05193313 A JPH05193313 A JP H05193313A JP 3050506 A JP3050506 A JP 3050506A JP 5050691 A JP5050691 A JP 5050691A JP H05193313 A JPH05193313 A JP H05193313A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- bead core
- steel
- modulus
- aramid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はタイヤのビ−ドコアをゴ
ム被覆されたスチ−ルワイヤ−で一層を形成し、その外
側にアラミド繊維糸状を巻回し、鋼線とアラミド繊維糸
条との複合効果を有する破裂強度が大にして軽量なタイ
ヤを提供する複数層よりなるタイヤのビ−ドコアに関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a layer of a bead core of a tire with a rubber-coated steel wire, and winds an aramid fiber thread on the outside thereof to form a composite of a steel wire and an aramid fiber thread. The present invention relates to a bead core of a tire having a plurality of layers, which has an effective burst strength and provides a lightweight tire.
【０００２】[0002]
【従来の技術】従来一般にタイヤビ−ド部は環状剛体の
ビ−ドコアで補強されている。タイヤのビ−ド部内径は
リムの対応する個所の外径より小さく、リムをタイヤに
嵌込んだときビ−ド部内径が拡大され、ビ−ドコアは伸
長しにくい材質で作成されているので、ビ−ドコアとリ
ムによって挟まれた個所のゴムは圧縮変形の張力を受け
る。その反作用として圧縮力が生じ、この圧縮力によっ
てタイヤがリムに固定されることになる。2. Description of the Related Art Conventionally, a tire bead portion is generally reinforced by an annular rigid bead core. The inner diameter of the bead part of the tire is smaller than the outer diameter of the corresponding part of the rim, the inner diameter of the bead part is enlarged when the rim is fitted into the tire, and the bead core is made of a material that does not easily expand. The rubber between the bead core and the rim is subjected to compressive deformation tension. As a reaction, a compressive force is generated, and this compressive force fixes the tire to the rim.
【０００３】そのためビ−トコア部は通常銅合金でメッ
キした直径0.5 〜20mmの鋼線を環状に多数回巻いたもの
が使用されていた。For this reason, the beat core portion is usually made of a steel wire having a diameter of 0.5 to 20 mm which is plated with a copper alloy and wound in a large number of rings.
【０００４】従来から非金属材料でビ−ドコア部を作成
するとビ−ドコア部が柔軟になり、リム組が容易にな
り、比重が小になるため車の軽量化が可能になるとされ
ていた。It has been conventionally known that when the bead core portion is made of a non-metallic material, the bead core portion becomes flexible, the rim assembly becomes easy, and the specific gravity becomes small, so that the weight of the vehicle can be reduced.
【０００５】例えば空気入りタイヤのビ−ド部における
ビ−ドコアがその材質として、2.5×104kg/cm2 以上の
弾性率と1.5 ×104kg/cm2 以上の強さを有する有機繊維
コ−ド例えば超太デニ−ルの芳香族ポリアミド繊維を使
用したビ−ドコアが提案されている。（特公昭56〜2272
2 号）For example, the bead core in the bead portion of a pneumatic tire has, as its material, an organic fiber having an elastic modulus of 2.5 × 10 4 kg / cm 2 or more and a strength of 1.5 × 10 4 kg / cm 2 or more. For example, a bead core using an ultra-thick denier aromatic polyamide fiber has been proposed. (Japanese Patent Publication Sho 56-2272
No. 2)
【０００６】また有機質もしくは金属を除く無機質の高
モジュラス繊維で作成されたビ−ド細線と液状の熱硬化
性樹脂又は液状ゴムの硬化されたマトリックス相からな
る軽量で、かつ耐久特性の優れたビ−ド部材をタイヤの
構成要素として具備する空気入りタイヤに関する発明
（特開昭57〜66007 号）である。Also, a lightweight and excellent durability property comprising a fine bead wire made of organic or inorganic high-modulus fiber excluding metal and a hardened matrix phase of a liquid thermosetting resin or liquid rubber The invention relates to a pneumatic tire having a tire member as a constituent element of the tire (JP 57-66007 A).
【０００７】[0007]
【発明が解決しようとする課題】前記したようにタイヤ
のビ−ド内径はリムの径よりも小さく、従って無理をし
てリムをタイヤに嵌込んでいるので、ビ−ドコア部には
大きな張力が掛かり、ビ−ドコア部の外周面に配置され
ているビ−コアを伸長せしめることになる。そのため第
１図矢印で示すように張力の反作用として圧縮力を受け
る。As described above, the inner diameter of the bead of the tire is smaller than the diameter of the rim, and therefore the rim is forcedly fitted into the tire, so that a large tension is applied to the bead core portion. As a result, the bead core arranged on the outer peripheral surface of the bead core is extended. Therefore, as shown by the arrow in FIG. 1, a compressive force is received as a reaction of tension.
【０００８】一方ビ−ドコアはカ−カスプライコ−ドの
太さの0.5 〜1.0 倍の間隔を設けてカ−カスプライコ−
ドを両ビ−ドコア部間に懸架し、該コ−ドに内圧による
張力が作用し、局部的にビ−トコアにはカ−カスプライ
コ−ドによってタイヤ半径の外方向に引張られるところ
とビ−ドフイラ−によって半径方向に圧縮されるところ
とが交互に作用して剪断力を生ずる。On the other hand, the bead core is provided with a gap of 0.5 to 1.0 times the thickness of the carcass plycode.
The cord is suspended between both bead cores, tension is applied to the cord by the internal pressure, and locally the bead core is pulled by the carcass ply cord toward the outside of the tire radius. Alternately acting with the radial compression by the duffler produces a shearing force.
【０００９】前記特公昭56−22722 号及び特開昭57−66
007 号に使用されているビ−トコア部の素材としてのア
ラミド繊維は引張り強力は大であるが、圧縮力又は剪断
力が作用するとアラミド繊維がフイブリル化する傾向に
あり、そのため強度低下を生ずる欠点がある。Japanese Patent Publication No. 56-22722 and Japanese Patent Application Laid-Open No. 57-66
The aramid fiber used as the material of the beat core portion used in No. 007 has a large tensile strength, but the aramid fiber tends to be fibrillated when a compressive force or a shearing force is applied, which causes a decrease in strength. There is.
【００１０】例えばタイヤが石などに乗り上げて大きく
変形したときにコ−ドには大きな張力が作用し、その結
果ビ−ドコア部に大きな剪断力が生じてタイヤの強度が
低下することになる。For example, when the tire rides on a stone or the like and is greatly deformed, a large tension acts on the code, and as a result, a large shearing force is generated in the bead core portion, which lowers the strength of the tire.
【００１１】本発明はタイヤのビ−ドコア部としてアラ
ミド繊維のみを使用する上記従来技術の欠点を改良し
て、従来の鋼線素材とアラミド繊維とを複合使用するこ
とによって、上記した強度の低下を防止し、かつタイヤ
の軽量化を達成することを目的とするものである。The present invention improves on the above-mentioned drawbacks of the prior art using only aramid fiber as the bead core portion of a tire, and by using a conventional steel wire material and aramid fiber in combination, the above-mentioned reduction in strength is achieved. The purpose is to prevent the above and to achieve the weight reduction of the tire.
【００１２】[0012]
【課題を解決するための手段】本発明は一本以上のスチ
−ル素線よりなり、該一本のスチ−ル素線がゴム被覆さ
れ、そのモジュラスが1.0 ×104kg/mm2 以上を有し、か
つ相互に左右相接するようにして、コイル状に巻回した
少なくとも一層のスチ−ル素線の外側に多数本のアラミ
ドフィラメントを無撚又は軽く片撚して糸条に束ね、ゴ
ムとの接着性のよい物質で被覆した該糸条が相互に接す
るようにして、複数層のコイル状に巻回してなる層を設
けたタイヤのビ−ドコアに関するものである。The present invention comprises one or more steel strands, wherein the one steel strand is covered with rubber and has a modulus of 1.0 × 10 4 kg / mm 2 or more. And a plurality of aramid filaments are untwisted or lightly single-stranded on the outside of at least one layer of steel wire wound in a coil shape and bundled into a yarn. The present invention relates to a bead core of a tire provided with a layer formed by winding a plurality of layers in a coil shape so that the yarns coated with a substance having a good adhesive property with rubber are in contact with each other.
【００１３】本発明のビ−ドコアに使用するスチ−ル線
のモジュラスが低いとビ−ドコアとリムベ−スとの間に
介在するゴムの圧縮作用が弱くなり、また炭素含有量が
0.95％よりも多く、過度に焼入れしてモジュラスを高く
した場合には折れやすくなるのでスチ−ル素線のモジュ
ラスは1.0 ×104 〜2.5 ×104kg/mm2 の範囲が好適であ
る。モジュラスをこの範囲にするにはスチ−ル素線を製
造するのに使用される鋼鉄材としては炭素含有量として
0.75〜0.95のものが好適である。When the modulus of the steel wire used in the bead core of the present invention is low, the compression effect of the rubber interposed between the bead core and the rim base is weakened, and the carbon content is low.
The modulus of the steel wire is preferably in the range of 1.0 × 10 4 to 2.5 × 10 4 kg / mm 2 , since the content of the steel wire is more than 0.95% and breaks easily when the modulus is increased by excessive quenching. For the modulus to be in this range, the steel content used to manufacture steel strands has a carbon content
Those of 0.75 to 0.95 are preferable.
【００１４】またアラミドフィラメント糸束の片撚り数
は無撚〜８回／10cm程度、好適には無撚〜５回／10cmに
してモジュラスを３×103kg/mm2 以上とする。片撚数が
８回／10cmを超過するとアラミドフィラメント糸条の伸
度が大になり望ましくない。The number of single twists of the aramid filament yarn bundle is not twisted to about 8 times / 10 cm, preferably not twisted to 5 times / 10 cm, and the modulus is set to 3 × 10 3 kg / mm 2 or more. When the number of single twists exceeds 8/10 cm, the elongation of the aramid filament yarn becomes large, which is not desirable.
【００１５】更にアラミドフィラメント糸条の強度に対
するモジュラスの比が20以上のものが選ばれる。20未満
ではビ−ドコアのリムを締めつける力が弱く、ビ−ド外
れを生じやすい欠点がある。Furthermore, the modulus of the aramid filament yarn to the strength is 20 or more. If it is less than 20, the force for tightening the rim of the bead core is weak and there is a drawback that the bead is likely to come off.
【００１６】本発明におけるモジュラスの測定条件は次
の式に従った。 アラミドフィラメント糸条を被覆するゴムとの接着性の
よい薬剤としてはレゾルシンフォルマリンラテックスが
好適であるが、その他ゴムとの接着性のよい薬剤なら如
何なるものでもよく例えばエポキシ樹脂等も使用可能で
ある。The conditions for measuring the modulus in the present invention were in accordance with the following equation. Resorcinol formalin latex is suitable as a drug having good adhesiveness with the rubber coating the aramid filament yarn, but any other drug having good adhesiveness with rubber may be used, for example, epoxy resin or the like can be used. ..
【００１７】[0017]
【実施例】ゴム被覆された直径0.96mm、モジュラス1.6
×104kg/mm2 の鋼製素線一本よりなる鋼線(2) （第２図
参照）を相互に接するように横方向にずらしながらコイ
ル状に５回巻回して第１層(1) を形成し、その上にアラ
ミドフィラメントを多数本束ねた12000 デニ−ルのヤ−
ンを10cm当り４回の片撚りをかけてなる糸条をレゾルシ
ンフォルマリンラテックスで被覆し、強度に対するモジ
ュラスの比が21の糸条(3) をコイル状に巻廻した層(4),
(4′),(4″) を３層重合してビ−ドコア部を作成した。Example: Rubber coated diameter 0.96 mm, modulus 1.6
A steel wire consisting of a single steel wire of × 10 4 kg / mm 2 (2) (see Fig. 2) is wound five times in a coil shape while being laterally displaced so as to be in contact with each other. 1) is formed, and a large number of aramid filaments are bundled on the 12000 denier yarn.
A yarn (3) having a modulus-to-strength modulus ratio of 21 is coated with resorcin formalin latex to form a coil (4).
Three layers of (4 ') and (4 ") were polymerized to prepare a bead core portion.
【００１８】上記のビ−ドコアを使用してタイヤを製造
しタイヤをリム上にリム組して内腔にタイヤが破裂する
まで水圧を加えた。比較タイヤとしてアラミド糸条を５
回コイル状に巻回して５層重ね、タイヤの水圧試験を行
った。それぞれを実施例タイヤを100 として指数で示す
と下記第１表の通りである。 ここに引張強度は鋼製素線及び糸条のそれぞれについて
の破断荷重とビ−ドコア断面での本数の積の合計量であ
る。A tire was manufactured using the above bead core, the tire was assembled on a rim, and water pressure was applied to the inner cavity until the tire burst. 5 aramid yarns for comparison tires
The tire was subjected to a hydraulic pressure test by winding it in a coil shape and stacking 5 layers. Each of the example tires is shown as an index with 100 being as shown in Table 1 below. Here, the tensile strength is the total amount of the product of the breaking load for each of the steel wire and the yarn and the number of the wires in the cross section of the bead core.
【００１９】第１表の結果より引張強度は比較例の方が
やや大であるが、破裂時の水圧は実施例の方が高く。本
願発明のビ−ドコアを使用したタイヤは破裂強度が大で
あることがわかる。From the results shown in Table 1, the tensile strength is slightly higher in the comparative example, but the hydraulic pressure at the time of rupture is higher in the example. It can be seen that the tire using the bead core of the present invention has a high burst strength.
【００２０】[0020]
【発明の効果】本発明のビ−ドコアを使用したタイヤは
アラミド繊維のみからなるビ−ドコアを使用したタイヤ
よりも破裂強度が20％程度大であり、かつ鋼線とアラミ
ド繊維束よりなる複合成分のビ−ドコアを有する本発明
使用のタイヤはビ−ドコアが鋼線のみよりなるタイヤに
比較して軽量であり、かつ耐久性に優れている。The tire using the bead core of the present invention has a burst strength of about 20% higher than that of the tire using the bead core made of only aramid fiber, and is a composite of steel wire and aramid fiber bundle. The tire according to the present invention having a bead core as a component is lighter in weight and excellent in durability as compared with a tire having a bead core made of only steel wire.
【００２１】[0021]
【図１】図−１はビ−ドコアに作用する張力と、圧縮力
が交互に作用することを示す模式図。FIG. 1 is a schematic view showing that a tension acting on a bead core and a compression force alternately act.
【図２】図−２は本発明の４層のビ−ドコア部を備えた
コ−ドの斜視図を示す。FIG. 2 is a perspective view of a code having a four-layer bead core portion according to the present invention.
１．アラミド繊維糸条をコイル状に巻回した第１層のビ
−ドコア部 ２．鋼製素線一本よりなる鋼線 ３．アラミドフィラメント糸条 ４，４′，４″．アラミドフィラメント糸条をコイル状
に巻回したそれぞれのビ−ドコアの層1. 1. A first-layer bead core portion formed by winding an aramid fiber yarn in a coil shape. Steel wire consisting of one steel strand 3. Aramid filament yarn 4, 4 ', 4 ". Layers of bead cores obtained by winding aramid filament yarn in a coil
Claims (2)
本のスチ−ル素線がゴム被覆され、そのモジュラスが1.
0 ×104kg/mm2 以上を有し、かつ相互に左右相接するよ
うにしてコイル状に巻回した少なくとも一層の外側に多
数本のアラミドフィラメントを無撚か又は軽く片撚して
糸条に束ね、ゴムとの接着性のよい物質で被覆した該糸
条が相互に接するようにして、複数層のコイル状に巻回
してなる層を設けたことを特徴とするビ−ドコア。1. A steel strand comprising one or more steel strands, the one steel strand being covered with rubber, and having a modulus of 1.
0 × 10 4 kg / mm 2 or more, and a number of aramid filaments are untwisted or lightly single-twisted on the outside of at least one layer wound in a coil shape so that they are in mutual contact with each other. A bead core comprising a plurality of layers wound in a coil shape such that the yarns bundled in a line and coated with a substance having a good adhesive property with rubber are in contact with each other.
るモジュラスの比が20以上である請求項１記載のビ−ド
コア。2. The bead core according to claim 1, wherein the ratio of the modulus to the strength of the aramid filament yarn is 20 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03050506A JP3080415B2 (en) | 1991-02-22 | 1991-02-22 | Tire bead core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03050506A JP3080415B2 (en) | 1991-02-22 | 1991-02-22 | Tire bead core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05193313A true JPH05193313A (en) | 1993-08-03 |
| JP3080415B2 JP3080415B2 (en) | 2000-08-28 |
Family
ID=12860848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03050506A Expired - Lifetime JP3080415B2 (en) | 1991-02-22 | 1991-02-22 | Tire bead core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3080415B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7201199B2 (en) * | 2000-01-27 | 2007-04-10 | Pirelli Pneumatici S.P.A. | Tire with bead core with hexagonal section |
| JP2008030504A (en) * | 2006-07-26 | 2008-02-14 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| JP4495309B2 (en) * | 2000-06-15 | 2010-07-07 | 住友ゴム工業株式会社 | Pneumatic tire |
-
1991
- 1991-02-22 JP JP03050506A patent/JP3080415B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7201199B2 (en) * | 2000-01-27 | 2007-04-10 | Pirelli Pneumatici S.P.A. | Tire with bead core with hexagonal section |
| JP4495309B2 (en) * | 2000-06-15 | 2010-07-07 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP2008030504A (en) * | 2006-07-26 | 2008-02-14 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3080415B2 (en) | 2000-08-28 |
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