JP2006248427A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2006248427A
JP2006248427A JP2005069222A JP2005069222A JP2006248427A JP 2006248427 A JP2006248427 A JP 2006248427A JP 2005069222 A JP2005069222 A JP 2005069222A JP 2005069222 A JP2005069222 A JP 2005069222A JP 2006248427 A JP2006248427 A JP 2006248427A
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rubber
bead core
carcass
bead
pneumatic tire
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Yoshihiko Suzuki
好彦 鈴木
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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 heavy-duty pneumatic tire capable of solving various problems relating to use of zinc-plated bead wire, especially bad adhesiveness. <P>SOLUTION: This pneumatic tire is composed of: a circumferential bead core rubber and a cover rubber arranged around a zinc-plated polygonal bead core, and a carcass ply including brass-plated steel cord formed thereon. The circumferential bead core is constituted of a rubber composition including an organic chlorinated compound containing 2 to 5 pts.wt. chlorine content to 100 pts.wt. diene rubber. The cover rubber, constituted of a semi-cured rubber composition excluding the organic chlorinated compound the thickness of which is 0.5 to 3 mm in an unvulcanized state, is arranged at least within a range where the carcass cord and the circumferential bead core rubber are arranged adjacent to each other, and the shortest distance between the bead wire and the carcass cord is 0.5 to 2.5 mm after vulcanization. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、空気入りタイヤに関し、更に詳細には、亜鉛メッキビードワイヤの使用に伴う諸問題、特に接着性の問題を解消した重荷重用空気入りタイヤに関する。   The present invention relates to a pneumatic tire, and more particularly, to a heavy-duty pneumatic tire in which various problems associated with the use of a galvanized bead wire, particularly an adhesive problem, are solved.

従来、空気入りタイヤのビード周りの強化策として、横断面形状六角形のビードコア周りに所定の硬度および厚さを有するプレキュアシートとゴム引き有機繊維コードを順次配設後、カーカスプライ側を巻き返す技術(以下の特許文献1)、所定の粘度およびモジュラスを有するビード周りカバーゴムとカーカスコード間の最大距離を1.5〜2.5mmとし、電子線照射によりカーカスゴムを高粘度化する技術(以下の特許文献2)、およびビードコアとカーカスプライ間に硬ゴム層と軟ゴム層を配置し、高ゴム層を予め電子線照射する技術(以下の特許文献3)が提案され、また、亜鉛メッキスチールコードとその周辺ゴムとを強固に接着させる対策として、当該ゴムに所定量のロジン、有機酸コバルト塩および有機塩素化化合物を配合したゴム組成物を用いる技術(以下の特許文献4)が提案されている。しかしながら、亜鉛メッキしたスチールコードを用いた多角形ビードコアとそのビードコア周りのゴムとの接着の問題、およびビードコアの角部とカーカスプライとの接触に伴う問題等を解消した技術は、未だ提案されていない。   Conventionally, as a strengthening measure around a bead of a pneumatic tire, a precured sheet having a predetermined hardness and thickness and a rubberized organic fiber cord are sequentially disposed around a bead core having a hexagonal cross section, and then the carcass ply side is rolled back. Technology (Patent Document 1 below), Technology for increasing the viscosity of a carcass rubber by electron beam irradiation with a maximum distance between a bead-around cover rubber having a predetermined viscosity and modulus and a carcass cord of 1.5 to 2.5 mm Patent Document 2), and a technique in which a hard rubber layer and a soft rubber layer are disposed between a bead core and a carcass ply, and a high rubber layer is irradiated with an electron beam in advance (Patent Document 3 below) are proposed. As a measure to firmly bond the cord and the surrounding rubber, a predetermined amount of rosin, organic acid cobalt salt, and organic chlorinated compound are added to the rubber. Techniques using a rubber composition (hereinafter Patent Document 4) have been proposed a. However, a technology that has solved the problem of adhesion between a polygonal bead core using a galvanized steel cord and the rubber around the bead core and the problem associated with contact between the corner of the bead core and the carcass ply has not yet been proposed. Absent.

特開2004−155096号公報JP 2004-155096 A 特開2004−50986号公報JP 2004-50986 A 特開2003−205714号公報JP 2003-205714 A 特開平11−21389号公報Japanese Patent Laid-Open No. 11-21389

よって、本発明では、亜鉛メッキしたビードワイヤを用いた多角形ビードコアを配設することに伴う、当該ビードコアとそのビードコア周りゴムおよびカバーゴムとカーカスプライとの接着性を改善し、かつ当該ビードコアの角部とカーカスプライとの接触に伴う諸問題を解決した空気入りタイヤを提供することを目的とする。   Therefore, the present invention improves the adhesion between the bead core and the rubber around the bead core, the cover rubber and the carcass ply, and the corners of the bead core, by arranging the polygonal bead core using the galvanized bead wire. An object of the present invention is to provide a pneumatic tire that solves various problems associated with contact between a portion and a carcass ply.

本発明によれば、亜鉛メッキを施した多角形ビードコアの周囲にビードコア周りゴム、カバーゴムを配し、更にその外側に、黄銅メッキを施したスチールコードを有するカーカスプライを配設してなる空気入りタイヤにおいて、当該ビードコア周りゴムは、ジエン系ゴム100重量部に対し塩素含有量で2〜5重量部となる有機塩素化化合物が含まれるゴム組成物で構成され、また当該カバーゴムは、前記有機塩素化化合物が含まれないゴム組成物で、その未加硫時の厚さが0.5〜3mmからなるセミキュア処理されたゴム組成物から構成され、かつそれが少なくともカーカスコードとビードコア周りゴムとが隣接する範囲に配設されて、加硫後のビードワイヤとカーカスコードとの最短距離が0.5〜2.5mmであることを特徴とする空気入りタイヤが提供される。   According to the present invention, an air formed by arranging a rubber around a bead core and a cover rubber around a galvanized polygonal bead core, and further arranging a carcass ply having a steel cord plated with brass on the outside thereof. In the tire, the rubber around the bead core is composed of a rubber composition containing an organic chlorinated compound having a chlorine content of 2 to 5 parts by weight with respect to 100 parts by weight of the diene rubber, and the cover rubber includes A rubber composition that does not contain an organic chlorinated compound, and is composed of a semi-cured rubber composition having an unvulcanized thickness of 0.5 to 3 mm, and at least the rubber around the carcass cord and the bead core Is disposed in an adjacent range, and the shortest distance between the vulcanized bead wire and the carcass cord is 0.5 to 2.5 mm. Pneumatic tire is provided.

本発明では、耐蝕性が大きい、スチールコードに亜鉛メッキを施した亜鉛メッキビードワイヤを集結して、その断面を四角形または六角形状等として構成した多角形ビードコアが用いられる。本発明では、図1に示すように、かかる多角形ビードコア(3)の周りに、ビードコア周りゴム(4)、更にその外側(カーカスプライ(1)との間)にカバーゴム(5)を配置し、そのカバーゴム(5)とカーカスプライ(1)とが接触するように配設する構造とする。なお、カーカスプライ(1)のスチールコードには接着性に優れる黄銅メッキされたワイヤから構成されるものが用いられ、更にカーカスプライの内側の折り返し部ではこれを覆うようにスチール強化材(2)が配置され、カーカスプライの折り返し部における更なる強化が図られている。   In the present invention, a polygonal bead core having a high corrosion resistance and a galvanized bead wire obtained by galvanizing a steel cord and having a cross section of a quadrangular or hexagonal shape is used. In the present invention, as shown in FIG. 1, a rubber (4) around the bead core is disposed around the polygonal bead core (3), and a cover rubber (5) is disposed outside (between the carcass ply (1)). And it is set as the structure arrange | positioned so that the cover rubber (5) and a carcass ply (1) may contact. The steel cord of the carcass ply (1) is made of brass-plated wire with excellent adhesion, and the steel reinforcing material (2) is covered so as to cover the folded portion inside the carcass ply. Is arranged to further strengthen the folded portion of the carcass ply.

本発明での特徴の一つは、前記ビードコア周りゴム(ここに、「ビードインシュレーションゴム」がある場合には、それをビートコア周りゴムとして兼用してもよい。)には、当該ゴムと亜鉛メッキしたビードコアとの接着性を確保するために、所定量の有機塩素化化合物が配合されるが、その外側に配置されるカバーゴムには、全く有機塩素化化合物が配合されていないことである。当該カバーゴムに有機塩素化化合物が配合されていると、黄銅メッキされているカーカスコードに対する耐水接着性の低下が生じるからである。更に、有機塩素化化合物が配合されていないカバーゴムを配設することで、加硫時のゴム流れによる有機塩素化化合物が配合されたビードコア周りゴムとカーカスワイヤとの直接接触を回避させることができる。   One of the features of the present invention is that the rubber around the bead core (here, when there is “bead insulation rubber”, it may be used as the rubber around the beat core), the rubber and zinc are used. In order to ensure adhesion with the plated bead core, a predetermined amount of the organic chlorinated compound is blended, but the cover rubber disposed on the outside thereof is blended with no organic chlorinated compound. . This is because when the cover rubber contains an organic chlorinated compound, the water-resistant adhesion to the carcass cord plated with brass is lowered. Further, by arranging a cover rubber not containing an organic chlorinated compound, direct contact between the rubber around the bead core containing the organic chlorinated compound and the carcass wire due to the rubber flow during vulcanization can be avoided. it can.

本発明で配置するビード周りゴムには、ジエン系ゴム100重量部に対し、有機塩素化化合物が塩素量で2〜5重量部、より好ましくは3〜4重量部配合される。この塩素量が2重量部未満では、亜鉛メッキされたビードコアとビードコア周りゴムとの接着性が十分でなく、逆に5重量部を超えると、カーカスプライ側での耐水接着性が低下するので好ましくない。   In the rubber around the bead arranged in the present invention, 2 to 5 parts by weight, more preferably 3 to 4 parts by weight of an organic chlorinated compound is blended with respect to 100 parts by weight of the diene rubber. If the amount of chlorine is less than 2 parts by weight, the adhesion between the galvanized bead core and the rubber around the bead core is not sufficient, and conversely if it exceeds 5 parts by weight, the water-resistant adhesiveness on the carcass ply side is reduced, which is preferable. Absent.

本発明で用いられる有機塩素化化合物には、一般的に塩素系難燃剤として使用される有機塩素化化合物が利用され、本発明では、これらの中でも直鎖の有機塩素化化合物、例えば、塩素化パラフィン、塩素化ポリエチレンなどが単独で、あるいは併用して用いられる。塩素化パラフィンでは、例えば、塩素含有量40%、45%、50%、65%、70%のものが市販され、いずれも利用可能である。   As the organic chlorinated compound used in the present invention, an organic chlorinated compound generally used as a chlorinated flame retardant is used. In the present invention, among these, a linear organic chlorinated compound such as chlorinated compound is used. Paraffin, chlorinated polyethylene, and the like are used alone or in combination. As the chlorinated paraffin, those having a chlorine content of 40%, 45%, 50%, 65%, 70% are commercially available, and any of them can be used.

また、本発明での特徴の一つは、前記カバーゴムが、未加硫時の厚さで、厚さ0.5〜3mmを有し、それが電子線照射などによってセミキュア処理され、しかも当該カバーゴムが、少なくともカーカスコードとビードコア周りゴムが隣接する範囲に配設されていることである。当該カバーゴムは、本来、多角形ビードコアの角部と接触してビードコアを支持し、加硫時あるいは走行時でのその動きを制限すると共に、ビードコアとカーカスコードとの直接接触を回避させる役割を果たすものであるので、前記した隣接位置に配設され、また、加硫カバーゴムの厚さには相当程度の厚さが要求される。よって、本発明では、その未加硫時での厚さが前記の範囲であれば、加硫時での適度の厚さと硬さが保障されることが確認され、また、これにセミキュア処理することで、加硫時でのゴム流れを防止できることが確認された。   Also, one of the features of the present invention is that the cover rubber has a thickness of 0.5 to 3 mm when it is not vulcanized, and is semi-cured by electron beam irradiation, etc. The cover rubber is disposed in a range where at least the carcass cord and the rubber around the bead core are adjacent to each other. The cover rubber originally supports the bead core in contact with the corners of the polygonal bead core, restricts its movement during vulcanization or running, and avoids direct contact between the bead core and the carcass cord. Therefore, the vulcanized cover rubber is required to have a considerable thickness. Therefore, in the present invention, it is confirmed that an appropriate thickness and hardness at the time of vulcanization are ensured if the thickness at the time of unvulcanized is within the above range, and this is semi-cured. It was confirmed that the rubber flow during vulcanization can be prevented.

更に、最終的に、本発明での主要な要件の一つは、前記したビード部構造を採った場合における、加硫後のビードワイヤとカーカスコードとの最短距離(G)が0.5〜2.5mmの範囲内にあることである。当該距離が0.5mm未満であるときは、カーカスプライ側の耐水接着性が不良となり、逆に2.5mmを超えるときは、ビードコアとカーカスコード間の剪断剛性が低下し、そのためビード部の耐久性が低下するので好ましくない。   Furthermore, finally, one of the main requirements in the present invention is that the shortest distance (G) between the bead wire after vulcanization and the carcass cord in the case of adopting the bead portion structure described above is 0.5-2. It is within the range of 5 mm. When the distance is less than 0.5 mm, the water-resistant adhesion on the carcass ply side becomes poor. Conversely, when the distance exceeds 2.5 mm, the shear rigidity between the bead core and the carcass cord is lowered, so that the durability of the bead portion is reduced. This is not preferable because the properties are lowered.

本発明で用いられるビードコア周りゴムおよびカバーゴム用のゴム組成物には、本発明での必須配合剤に加えて、カーボンブラックやシリカなどの補強剤、加硫または架橋剤、加硫または加硫促進剤、各種オイル、老化防止剤、可塑剤、他の接着補助剤など、一般にかかるゴム組成物に配合される配合剤を配合することができ、かかる配合剤は、一般的な方法で配合、混練してゴム組成物とし、加硫または架橋することができる。これら配合剤の添加量も、本発明の目的に反しない限り、従来の一般的な量とすることができる。   The rubber composition for the bead core surrounding rubber and cover rubber used in the present invention includes a reinforcing agent such as carbon black and silica, a vulcanization or crosslinking agent, a vulcanization or vulcanization, in addition to the essential compounding agent in the present invention. A compounding agent generally blended into such a rubber composition, such as an accelerator, various oils, an anti-aging agent, a plasticizer, and other adhesion aids can be blended. The rubber composition can be kneaded and vulcanized or crosslinked. The addition amount of these compounding agents can also be a conventional general amount as long as the object of the present invention is not violated.

以下、標準例、実施例および比較例によって本発明を更に説明するが、本発明の技術的範囲をこれらの実施例に限定するものでないことは言うまでもない。   The present invention will be further described below with reference to standard examples, examples and comparative examples, but it goes without saying that the technical scope of the present invention is not limited to these examples.

試験タイヤの作製
以下の表1に示す配合組成のビードコア周りゴム用のゴム組成物およびカバーゴム用ゴム組成物を混練し、更に黄銅メッキしたカーカスコードを埋設したカーカスプライおよび亜鉛メッキしたビードワイヤから構成した断面四角形のビードコアを用意し、これらのゴム組成物および各部材を用いて表2の各例における11R22.5サイズの試験タイヤをそれぞれ作製した。
Preparation of test tire A rubber composition for a bead core and a rubber composition for a cover rubber having a composition shown in Table 1 below are kneaded, and further composed of a carcass ply in which a brass-plated carcass cord is embedded and a galvanized bead wire. A bead core having a square cross section was prepared, and 11R22.5 size test tires in each example of Table 2 were prepared using these rubber compositions and the respective members.

Figure 2006248427
Figure 2006248427

測定・試験法
1)加硫タイヤのビードワイヤ−カーカスコート間の最短距離(G):加硫後のタイヤをラジアル方向に切断し、ビードコアからカーカスコードまでの最短距離を測定した。
2)耐水接着性:加硫後のタイヤを高湿度チャンバーに投入後(70℃×湿度96%×28日間)、カーカスターンナップ部よりカーカスプライとビードコア間を剥いでいき、それぞれビードコア側およびカーカスプライ側のゴム付を0〜100%で目視判定した。75%以上を合格とした。
3)ビード部耐久性:タイヤを空気圧=900kPaに空気充填し、直径=1.7mドラム上をJATMA規定最大負荷の195〜240%荷重×60km/hで走行させ、故障が発生するまでの走行距離を、標準例の走行距離を100として指数表示した。数値が大きい程、ビード部耐久性が良好であることを示す。
Measurement / Test Method 1) Shortest distance between bead wire and carcass coat of vulcanized tire (G): The vulcanized tire was cut in the radial direction, and the shortest distance from the bead core to the carcass cord was measured.
2) Water-resistant adhesion: After putting the vulcanized tire into a high-humidity chamber (70 ° C x 96% x 28 days), the carcass ply and bead core are peeled off from the carcass turn-up part, and the bead core side and carcass side, respectively. The rubber attachment on the ply side was visually judged at 0 to 100%. More than 75% was accepted.
3) Durability of the bead portion: Tires are filled with air pressure to 900 kPa, and the diameter is 1.7 m, and the drum is run at a load of 195 to 240% of the maximum load specified by JATMA × 60 km / h until the failure occurs. The distance was displayed as an index with the distance traveled in the standard example as 100. It shows that bead part durability is so favorable that a numerical value is large.

標準例、実施例1〜2および比較例1〜4
結果を、以下の表2に示す。

Figure 2006248427
Standard example, Examples 1-2 and Comparative Examples 1-4
The results are shown in Table 2 below.
Figure 2006248427

上記表2の結果から、比較例1のように、ビードコア周りゴム配合の塩素量が2重量部未満では、亜鉛メッキワイヤのビードコア側での接着性が不十分であり、比較例2のように、5重量部超では、本発明のカバーゴムを使用してもカーカスプライ側での接着性が悪化することが分かる。また、比較例3のように、カバーゴムの未加硫時の厚さが0.5未満では、加硫後のタイヤでのビードコア−カーカスコード間の最短距離(G)が0.5mm以下となり、カーカスプライ側での接着性が悪化し、また、比較例4のように、カバーゴムの未加硫時の厚さが3mm超では、加硫後のタイヤでのビードコア−カーカスコード間の最短距離(G)が2.5mm超となり、ビードコアとカーカスコード間の剪断剛性が低下するので、ビード部耐久性が低下することが分かる。これに対して、本発明の規定要件を満たす実施例1および2では、所期の加硫後のタイヤでのビードコア−カーカスコード間の最短距離(G)が保持され、また、ビードコア側並びにカーカスプライ側での接着性も良好で、かつビード部耐久性も良好であることが示されている。   From the results of Table 2 above, as in Comparative Example 1, when the chlorine content of the rubber compound around the bead core is less than 2 parts by weight, the adhesion on the bead core side of the galvanized wire is insufficient, as in Comparative Example 2. If it exceeds 5 parts by weight, it can be seen that the adhesion on the carcass ply side deteriorates even when the cover rubber of the present invention is used. As in Comparative Example 3, when the unvulcanized thickness of the cover rubber is less than 0.5, the shortest distance (G) between the bead core and the carcass cord in the vulcanized tire is 0.5 mm or less. The adhesion on the carcass ply side deteriorates, and as in Comparative Example 4, when the unvulcanized thickness of the cover rubber exceeds 3 mm, the shortest distance between the bead core and the carcass cord in the vulcanized tire It can be seen that the distance (G) exceeds 2.5 mm, and the shear rigidity between the bead core and the carcass cord is lowered, so that the bead portion durability is lowered. On the other hand, in Examples 1 and 2 that satisfy the prescribed requirements of the present invention, the shortest distance (G) between the bead core and the carcass cord in the intended vulcanized tire is maintained, and the bead core side and the carcass It is shown that the adhesion on the ply side is good and the bead portion durability is also good.

本発明の空気入りタイヤにおけるビードコア部の拡大断面図である。It is an expanded sectional view of the bead core part in the pneumatic tire of the present invention.

符号の説明Explanation of symbols

1 カーカスプライ
2 スチール強化材
3 ビードコア
4 ビード周りゴム(またはビードインシュレーションゴム)
5 カバーゴム
G 加硫後のビードワイヤとカーカスコード間の最短距離
1 Carcass ply 2 Steel reinforcement 3 Bead core 4 Bead circumference rubber (or bead insulation rubber)
5 Cover rubber G Shortest distance between vulcanized bead wire and carcass cord

Claims (1)

亜鉛メッキを施した多角形ビードコアの周囲にビードコア周りゴム、カバーゴムを配し、更にその外側に、黄銅メッキを施したスチールコードを有するカーカスプライを配設してなる空気入りタイヤにおいて、当該ビードコア周りゴムは、ジエン系ゴム100重量部に対し塩素含有量で2〜5重量部となる有機塩素化化合物が含まれるゴム組成物で構成され、また当該カバーゴムは、前記有機塩素化化合物が含まれないゴム組成物で、その未加硫時の厚さが0.5〜3mmからなるセミキュア処理されたゴム組成物から構成され、かつそれが少なくともカーカスコードとビードコア周りゴムとが隣接する範囲に配設されて、加硫後のビードワイヤとカーカスコードとの最短距離が0.5〜2.5mmであることを特徴とする空気入りタイヤ。   In a pneumatic tire in which a rubber bead core rubber and a cover rubber are arranged around a galvanized polygonal bead core and a carcass ply having a steel cord plated with brass is arranged on the outer side of the bead core. The surrounding rubber is composed of a rubber composition containing an organic chlorinated compound having a chlorine content of 2 to 5 parts by weight with respect to 100 parts by weight of the diene rubber, and the cover rubber contains the organic chlorinated compound. The rubber composition is composed of a semi-cured rubber composition having an unvulcanized thickness of 0.5 to 3 mm, and at least in a range where the carcass cord and the rubber around the bead core are adjacent to each other. A pneumatic tire, characterized in that the shortest distance between the vulcanized bead wire and the carcass cord is 0.5 to 2.5 mm.
JP2005069222A 2005-03-11 2005-03-11 Pneumatic tire Pending JP2006248427A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011179136A (en) * 2010-03-01 2011-09-15 Bridgestone Corp Composite material, method for producing composite material, bead core and tire using the composite material, and method for producing the tire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011179136A (en) * 2010-03-01 2011-09-15 Bridgestone Corp Composite material, method for producing composite material, bead core and tire using the composite material, and method for producing the tire

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