JP3080415B2 - Tire bead core - Google Patents
Tire bead coreInfo
- Publication number
- JP3080415B2 JP3080415B2 JP03050506A JP5050691A JP3080415B2 JP 3080415 B2 JP3080415 B2 JP 3080415B2 JP 03050506 A JP03050506 A JP 03050506A JP 5050691 A JP5050691 A JP 5050691A JP 3080415 B2 JP3080415 B2 JP 3080415B2
- Authority
- JP
- Japan
- Prior art keywords
- tire
- bead core
- steel wire
- modulus
- bead
- 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.)
- Expired - Lifetime
Links
- 239000011324 bead Substances 0.000 title claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 239000004760 aramid Substances 0.000 claims description 13
- 229920003235 aromatic polyamide Polymers 0.000 claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 12
- 229920006231 aramid fiber Polymers 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 9
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- KVBYPTUGEKVEIJ-UHFFFAOYSA-N benzene-1,3-diol;formaldehyde Chemical compound O=C.OC1=CC=CC(O)=C1 KVBYPTUGEKVEIJ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Tires In General (AREA)
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 relates to a composite of a steel wire and an aramid fiber yarn in which a bead core of a tire is formed in one layer with a rubber-coated steel wire, and an aramid fiber yarn is wound around the outside. The present invention relates to a bead core of a tire having a plurality of layers, which has a large bursting 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 with an annular rigid bead core. Since the inner diameter of the bead portion of the tire is smaller than the outer diameter of the corresponding portion of the rim, the inner diameter of the bead portion is enlarged when the rim is fitted to the tire, and the bead core is made of a material which is difficult to elongate. The rubber between the bead core and the rim is subjected to compressive deformation tension. As a reaction, a compression force is generated, and the compression 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。[0003] For this reason, the beat core portion is usually formed by winding a steel wire having a diameter of 0.5 to 20 mm, which is plated with a copper alloy, into a ring many times.
【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。Conventionally, if a bead core is made of a non-metallic material, the bead core is made flexible, the rim assembly is facilitated, and the specific gravity is reduced, 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, a bead core in a bead portion of a pneumatic tire is made of 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. A bead core using a code, for example, a super-denier aromatic polyamide fiber has been proposed. (Special Publication No. 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。A lightweight and durable bead comprising a fine bead formed of an organic or inorganic high-modulus fiber excluding metals and a cured 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 a tire (Japanese Patent Application Laid-Open No. 57-66007).
【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. Therefore, since the rim is forcibly fitted into the tire, a large tension is applied to the bead core. And the bead core arranged on the outer peripheral surface of the bead core portion is elongated. Therefore, as shown by the arrow in FIG. 1, a compressive force is received as a reaction of the 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 an interval of 0.5 to 1.0 times the thickness of the carcass ply cord,
The bead is suspended between the two bead cores, and tension is applied to the bead by the internal pressure, and the bead core is locally pulled outward by the carcass ply code in the radial direction of the tire. The compression in the radial direction by the air filter acts alternately to generate 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。The above-mentioned JP-B-56-22722 and JP-A-57-66.
The aramid fiber used as a material for the beat core used in No. 007 has a large tensile strength, but the aramid fiber tends to fibrillate when a compressive force or a shear force is applied, resulting in 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 by riding on the stone, a large tension acts on the cord, and as a result, a large shearing force is generated in the bead core, and the strength of the tire is reduced.
【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 solves the above-mentioned disadvantages of the prior art using only aramid fiber as a bead core portion of a tire, and reduces the above-mentioned strength by using a composite of a conventional steel wire material and aramid fiber. It is an object of the present invention to prevent the occurrence of a tire and to reduce the weight 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〜
２．５ ×１０４kg/ｍｍ２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スチー
ル素線一層の外側に多数本のアラミドフィラメントを無
撚から８回／１０ｃｍ程度片撚して糸条に束ね、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２
０以上であり、かつ、ゴムとの接着性のよい物質で被覆
した該糸条が相互に相接するようにして、複数層のコイ
ル状に巻回してなる層を設けて、鋼線素材とアラミド繊
維糸条とを複合使用したことを特徴とするタイヤのビ−
ドコアに関するものである。The present invention comprises one or more steel strands, and the one steel strand is rubber-coated and has a modulus of 1.0 × 10 4 kg / kg. mm 2 ~
2.5 × 10 4 kg / mm 2 , and a large number of aramid filaments are untwisted eight times outside at least one steel wire layer wound in a coil shape so as to be mutually adjacent to each other. / 10 cm and twisted into a yarn, and the ratio of the modulus to the strength of the aramid filament yarn is 2
0 or more, and so that the yarns coated with a substance having good adhesiveness to rubber are provided so as to be in contact with each other, and provided with a plurality of layers wound in a coil shape, and a steel wire material and Tire beads characterized in that they are combined with aramid fiber yarns.
It is about docoa.
【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。If the modulus of the steel wire used in the bead core of the present invention is low, the compressive action of the rubber interposed between the bead core and the rim base is weakened, and the carbon content is reduced.
If the modulus is higher than 0.95% and the modulus is increased by excessive quenching, the steel strand is likely to break. Therefore, the modulus of the steel strand is preferably in the range of 1.0 × 10 4 to 2.5 × 10 4 kg / mm 2 . In order to make the modulus within this range, the steel material used to produce the steel strand has a carbon content of
Those with 0.75 to 0.95 are preferred.
【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。[0014] The number of twists of the aramid filament yarn bundle is about 1 to 8 times / 10 cm, preferably about 5 to 10 times, and the modulus is 3 × 10 3 kg / mm 2 or more. If 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。Further, aramid filament yarn having a modulus to strength ratio of 20 or more is selected. If it is less than 20, there is a disadvantage that the force for tightening the rim of the bead core is weak, and the bead tends 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。In the present invention, the measurement conditions of the modulus follow the following equation. A resorcinol-formalin latex is suitable as the agent having good adhesiveness with the rubber covering the aramid filament yarn, but any other agent having good adhesiveness with rubber can be used, for example, epoxy resin and 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。EXAMPLES Rubber coated 0.96 mm diameter, 1.6 modulus
× 10 4 kg / mm 2 steel wire (2) consisting of a single strand of steel (see Fig. 2) is wound five times in a coil shape while being shifted laterally so as to be in contact with each other, and the first layer ( 1), and a 12000 denier yarn formed by bundling a number of aramid filaments
A layer obtained by coating a yarn obtained by twisting the yarn four times per 10 cm with resorcinol formalin latex and winding a yarn (3) having a modulus to strength ratio of 21 in a coil shape (4),
(4 ') and (4 ") were polymerized in three layers to form a bead core.
【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-described bead core, and the tire was assembled on a rim, and water pressure was applied to the bore until the tire burst. 5 aramid threads as comparative tires
Twenty-five layers were wound in a coil shape, and a water pressure test of the tire was performed. Table 1 below shows each of the tires of the example as an index, with the tire being 100 as an example. 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 steel wire and the number of the yarns in the cross section of the bead.
【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 water 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 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 about 20% higher than the tire using the bead core consisting of only aramid fiber, and a composite comprising a steel wire and an aramid fiber bundle. The tire according to the present invention having the component bead core is lighter in weight and superior 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 diagram showing that a tension acting on a bead core and a compression force act alternately.
【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-layered bead core 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 bead core portion of a first layer in which aramid fiber yarn is wound in a coil shape. 2. Steel wire consisting of one steel strand Aramid filament yarn 4,4 ', 4 ". Each bead core layer in which aramid filament yarn is wound in a coil shape
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 喜悦 兵庫県伊丹市天津藤ノ木100番地 東洋 ゴム工業株式会社 タイヤ技術センタ− 内 (56)参考文献 特開 昭51−83302（ＪＰ，Ａ) 特開 平１−239134（ＪＰ，Ａ) 特開 平４−183614（ＪＰ，Ａ) 実開 昭58−61603（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B60C 15/04 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kietsu Maeda 100 Tianjin Fujinoki, Itami-shi, Hyogo Toyo Tire & Rubber Co., Ltd. Tire Technology Center (56) References JP-A-51-83302 (JP, A) JP-A-1-239134 (JP, A) JP-A-4-183614 (JP, A) JP-A-58-61603 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) B60C 15 / 04
Claims (1)
のスチ−ル素線がゴム被覆され、そのモジュラスが１．
０×１０４kg/ｍｍ２〜２．５ ×１０４kg/ｍｍ２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
回した少なくともスチール素線一層の外側に多数本のア
ラミドフィラメントを無撚から８回／１０ｃｍ程度片撚
して糸条に束ね、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以上であり、かつ、ゴムとの
接着性のよい物質で被覆した該糸条が相互に相接するよ
うにして、複数層のコイル状に巻回してなる層を設け
て、鋼線素材とアラミド繊維糸条とを複合使用したこと
を特徴とするタイヤのビ−ドコア。1. A steel wire comprising at least one steel wire, wherein said one steel wire is coated with rubber and has a modulus of 1.
0 × 10 4 kg / mm 2 〜 2.5 × 10 4 kg / mm 2 Aramid filaments were twisted about 8 times / 10 cm from non-twisted and bundled into a yarn, coated with a material having a modulus of modulus to strength of the aramid filament yarn of 20 or more and having good adhesion to rubber. A tire bead comprising a steel wire material and an aramid fiber yarn combined with a plurality of layers wound in a coil shape so that the yarns are in contact with each other. Docoa.
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 JPH05193313A (en) | 1993-08-03 |
| JP3080415B2 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60142416D1 (en) * | 2000-01-27 | 2010-07-29 | Pirelli | AIR TIRES WITH WOLF CORE HAVING A HEXAGONAL CROSS SECTION |
| JP4495309B2 (en) * | 2000-06-15 | 2010-07-07 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP5028896B2 (en) * | 2006-07-26 | 2012-09-19 | 横浜ゴム株式会社 | Pneumatic tire |
-
1991
- 1991-02-22 JP JP03050506A patent/JP3080415B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05193313A (en) | 1993-08-03 |
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