JP2008030504A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2008030504A
JP2008030504A JP2006202804A JP2006202804A JP2008030504A JP 2008030504 A JP2008030504 A JP 2008030504A JP 2006202804 A JP2006202804 A JP 2006202804A JP 2006202804 A JP2006202804 A JP 2006202804A JP 2008030504 A JP2008030504 A JP 2008030504A
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pneumatic tire
cord
grommet
bead core
tire
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JP5028896B2 (en
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Ryuzo Komatsu
竜三 小松
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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 pneumatic tire improved in fitting property with a rim by preventing breakage of a cross-section shape of a bead core on the tire after vulcanization. <P>SOLUTION: The bead core 3 buried in a bead part 2 is constituted by spirally winding a cord or a filament made of aliphatic poly-ketone fiber expressed by a formula (1)-(CH<SB>2</SB>-CH<SB>2</SB>-CO)<SB>n</SB>-(R-CO)<SB>m</SB>-, and a formula (2)1.00≤(n+m)/n≤1.05 around the circumference of a grommet 3w formed by laminating and winding a steel wire (w) around it. Hereby, R is an alkylene group the number of carbon of which is more than 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は空気入りタイヤに関し、さらに詳しくは、タイヤ加硫時におけるビードコアの断面形状の崩れを防止してリムとの嵌合性を高めるようにした空気入りタイヤに関する。   The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire that prevents a bead core from collapsing in cross-section during tire vulcanization and enhances fitting with a rim.

空気入りタイヤのビード部に埋設するビードコアには、スチールワイヤを幅方向に配列すると共に、径方向に積層するように巻き重ねられて環状のグロメットに形成したものが広く使用されている。一般に、ビードコアはタイヤの骨格を形成するカーカス層の両端部を係止すると共に、タイヤとリムとの嵌合性を高めてタイヤ内圧の漏洩を防止する役割を担っている。   As a bead core embedded in a bead portion of a pneumatic tire, steel wires arranged in a width direction and wound in a radial direction to be formed into an annular grommet are widely used. In general, the bead core plays a role of locking both ends of the carcass layer forming the skeleton of the tire and improving the fit between the tire and the rim to prevent leakage of tire internal pressure.

したがって、このような機能を司るビードコアのワイヤがバラケることによってこの機能が失墜することのないように、従来、グロメットの周囲にラッピング材を螺旋状に巻き付けることが行われてきた（例えば、特許文献１参照）。ところが、従来のラッピング材では、グロメットの結束性に限界があり、タイヤの加硫工程における膨径時にカーカス層の強い引張り力を受けると、周辺ゴムの流動に伴い、図３に示すように、積層されたワイヤの断面形状が崩れてしまい、加硫後のタイヤにおけるビードコアの締め付け力が低下するため、リムとの嵌合性が悪化するという問題があった。
特開平８−１６９２１６号公報 Therefore, conventionally, a lapping material has been spirally wound around the grommet so that the function of the bead core wire that controls the function is not lost due to scattering (for example, patents). Reference 1). However, in the conventional wrapping material, there is a limit to the grommet bundling properties, and when the carcass layer is subjected to a strong tensile force at the time of expansion in the vulcanization process of the tire, as shown in FIG. Since the cross-sectional shape of the laminated wires is collapsed, and the tightening force of the bead core in the vulcanized tire is reduced, there is a problem that the fitting property with the rim is deteriorated.
JP-A-8-169216

本発明の目的は、かかる従来の問題点を解消するもので、加硫後のタイヤにおけるビードコアの断面形状の崩れを防止して、リムとの嵌合性を高めるように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 solve such a conventional problem, and to provide a pneumatic tire that prevents the bead core from being deformed in cross-sectional shape in a vulcanized tire and improves the fitting property with a rim. There is to do.

上記目的を達成するための本発明の空気入りタイヤは、ゴム被覆したスチールワイヤを幅方向に配列すると共に、径方向に積層するように巻き重ねて環状のグロメットに形成し、該グロメットの周囲にラッピング材を螺旋状に巻き付けたビードコアを左右一対のビード部に埋設し、該ビードコアの周囲にカーカス層の両端部をタイヤ内側から外側に向けて折り返した空気入りタイヤにおいて、前記ラッピング材を下記式（１）及び（２）により表される脂肪族ポリケトン繊維からなるコード又はモノフィラメントで構成したことを特徴とする。
−（ＣＨ2 −ＣＨ2 −ＣＯ）n −（Ｒ−ＣＯ）m − ・・・・・・（１）
（ここで、Ｒは炭素数が３以上のアルキレン基）
１．００≦（ｎ＋ｍ）／ｎ≦１．０５ ・・・・・・・・・・・・（２） In order to achieve the above object, the pneumatic tire according to the present invention is formed by arranging rubber-coated steel wires in the width direction and winding them so as to be laminated in the radial direction to form an annular grommet, and surrounding the grommet. In a pneumatic tire in which a bead core in which a wrapping material is spirally wound is embedded in a pair of left and right bead parts, and both ends of a carcass layer are turned around the bead core from the inside to the outside of the tire, the wrapping material is expressed by the following formula It is characterized by comprising cords or monofilaments composed of aliphatic polyketone fibers represented by (1) and (2).
— (CH 2 —CH 2 —CO) n — (R—CO) m — (1)
(Where R is an alkylene group having 3 or more carbon atoms)
1.00 ≦ (n + m) /n≦1.05 (2)

さらに、上述する構成において、以下の（イ）〜（ニ）に記載するように構成することが好ましい。
（イ）コード又はモノフィラメントとして、１５０℃における乾熱時の収縮応力が０．１９〜０．８１ｃＮ／ｄｔｅｘの脂肪族ポリケトン繊維を使用する。
（ロ）コード又はモノフィラメントの太さを９００〜３３００ｄｔｅｘにする。
（ハ）コードをマルチフィラメントの撚りコードで構成し、コードの１０ｃｍあたりの撚り数を１０〜５０にする。
（ニ）コード又はモノフィラメントを複数本平行に引き揃えてゴム被覆した帯状体に形成し、該帯状体をグロメットの周囲に螺旋状に巻き付けるようにする。 Furthermore, in the above-described configuration, it is preferable to configure as described in the following (A) to (D).
(A) As a cord or monofilament, an aliphatic polyketone fiber having a shrinkage stress of 0.19 to 0.81 cN / dtex at 150 ° C. during dry heat is used.
(B) The thickness of the cord or monofilament is set to 900 to 3300 dtex.
(C) The cord is composed of a multifilament twisted cord, and the number of twists per 10 cm of the cord is set to 10-50.
(D) A plurality of cords or monofilaments are arranged in parallel to form a rubber-coated belt-like body, and the belt-like body is spirally wound around the grommet.

本発明によれば、グロメットの周囲に巻き付けるラッピング材を高い熱収縮応力を有する脂肪族ポリケトン繊維からなるコード又はモノフィラメントで構成したので、タイヤの加硫工程においてラッピング材によるグロメットに対する拘束力が増大されて、膨径時にカーカス層から強い引張り力を受けてもビードコア断面の形崩れを防止して、ビード部とリムとの嵌合性を向上することができる。   According to the present invention, since the wrapping material wound around the grommet is composed of cords or monofilaments made of aliphatic polyketone fibers having high heat shrinkage stress, the restraining force against the grommet by the wrapping material is increased in the vulcanization process of the tire. Thus, even when a strong tensile force is applied from the carcass layer at the time of expansion, the bead core cross-section can be prevented from being deformed, and the fit between the bead portion and the rim can be improved.

以下、本発明の構成につき添付の図面を参照しながら詳細に説明する。   Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

図１は本発明の実施形態による空気入りタイヤを示す半断面図、図２は図１のタイヤにおけるビードコアの一部を示す斜視図である。   FIG. 1 is a half sectional view showing a pneumatic tire according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a part of a bead core in the tire of FIG.

図１において、空気入りタイヤ１は、左右一対のビード部２、２にそれぞれビードコア３、３を埋設し、左右のビードコア３、３の周囲にカーカス層４の両端部４ａ、４ａをタイヤ内側から外側に向けて折り返している。   In FIG. 1, a pneumatic tire 1 has bead cores 3 and 3 embedded in a pair of left and right bead portions 2 and 2, and both end portions 4 a and 4 a of a carcass layer 4 are placed around the left and right bead cores 3 and 3 from the inside of the tire. Folds outward.

左右のビードコア３は、図２に示すように、ゴム被覆したスチールワイヤｗを幅方向に配列すると共に、径方向に積層するように巻き重ねた環状のグロメット３ｗからなり、その周囲に下記式（１）及び（２）により表される脂肪族ポリケトン繊維（以下、ＰＯＫ繊維という）で構成されるコード又はモノフィラメントからなるラッピング材５が螺旋状に巻き付けられている。
−（ＣＨ2 −ＣＨ2 −ＣＯ）n −（Ｒ−ＣＯ）m − ・・・・・・（１）
（ここで、Ｒは炭素数が３以上のアルキレン基）
１．００≦（ｎ＋ｍ）／ｎ≦１．０５ ・・・・・・・・・・・・（２） As shown in FIG. 2, the left and right bead cores 3 are formed of annular grommet 3 w in which rubber-coated steel wires w are arranged in the width direction and wound so as to be laminated in the radial direction. A wrapping material 5 made of a cord or monofilament composed of an aliphatic polyketone fiber (hereinafter referred to as POK fiber) represented by 1) and (2) is spirally wound.
— (CH 2 —CH 2 —CO) n — (R—CO) m — (1)
(Where R is an alkylene group having 3 or more carbon atoms)
1.00 ≦ (n + m) /n≦1.05 (2)

このようにグロメット３ｗの周囲にラッピング材５として高い熱収縮応力を有するＰＯＫ繊維からなるコード又はモノフィラメントを巻き付けたことにより、タイヤ加硫時におけるラッピング材５によるグロメット３ｗに対する拘束力が増大されて、膨径時にカーカス層４から強い引張り力を受けてもビードコア３断面の形崩れを防止して、ビード部２とリムとの嵌合性を向上することができる。   Thus, by wrapping the cord or monofilament made of POK fiber having a high heat shrinkage stress as the wrapping material 5 around the grommet 3w, the restraining force on the grommet 3w by the wrapping material 5 during tire vulcanization is increased. Even if a strong tensile force is applied from the carcass layer 4 at the time of expansion, it is possible to prevent the cross-section of the bead core 3 from being deformed and to improve the fit between the bead portion 2 and the rim.

なお、グロメット３ｗの周囲に巻き付けるラッピング材５の巻き付けピッチは特に限定されないが、図２に示す巻き付けピッチＰが５〜３０ｍｍとなるように調整するとよい。これにより、ビードコア３の形崩れを効率よく防止することができる。   In addition, the winding pitch of the wrapping material 5 wound around the grommet 3w is not particularly limited, but may be adjusted so that the winding pitch P shown in FIG. 2 is 5 to 30 mm. Thereby, shape collapse of bead core 3 can be prevented efficiently.

本発明において、ラッピング材５を構成するコード又はモノフィラメントには、１５０℃における乾熱時の収縮応力が０．１９〜０．８１ｃＮ／ｄｔｅｘ、好ましくは０．４０〜０．８０ｃＮ／ｄｔｅｘのＰＯＫ繊維を使用するとよい。これにより、グロメット３ｗの結束力を確実に高めることができる。ここで、上述する１５０℃における乾熱時の収縮応力は、ＪＩＳ Ｌ１０１７に準拠して測定した場合の値をいう。   In the present invention, the cord or monofilament constituting the wrapping material 5 has a POK fiber having a shrinkage stress of 0.19 to 0.81 cN / dtex, preferably 0.40 to 0.80 cN / dtex at 150 ° C. during dry heat. Should be used. Thereby, the binding force of the grommet 3w can be reliably increased. Here, the shrinkage stress at the time of dry heat at 150 ° C. mentioned above refers to a value when measured according to JIS L1017.

上述するコード又はモノフィラメントには、あらかじめゴムとの接着を良好にするために公知の手段により接着処理を施しておき、グロメット３ｗの周囲に巻き付けるようにするとよい。また、必要に応じて、コード又はモノフィラメントの表面にゴムを被覆しておき、これをグロメット３ｗの周囲に巻き付けるようにしてもよい。   The cord or monofilament described above is preferably subjected to an adhesive treatment by a known means in advance in order to improve the adhesion with rubber, and is wound around the grommet 3w. If necessary, the surface of the cord or monofilament may be covered with rubber and wound around the grommet 3w.

さらに、コード又はモノフィラメントの太さを９００〜３３００ｄｔｅｘ、好ましくは１１００〜２７５０ｄｔｅｘにするとよい。太さが９００ｄｔｅｘ未満ではグロメット３ｗの結束力が不足することになり、３３００ｄｔｅｘ超ではコード径が太くなり過ぎてカーカス層４と干渉してしまう。   Further, the thickness of the cord or monofilament may be 900 to 3300 dtex, preferably 1100 to 2750 dtex. If the thickness is less than 900 dtex, the binding force of the grommet 3w will be insufficient, and if it exceeds 3300 dtex, the cord diameter will be too thick and interfere with the carcass layer 4.

上述するラッピング材５をコードにより構成する場合には、コードをマルチフィラメントの撚りコードで構成し、このコードの１０ｃｍあたりの撚り数を１０〜５０、好ましくは２０〜４０にするとよい。１０ｃｍあたりの撚り数が１０未満ではコードの耐疲労性が低下することになり、５０超ではコードの伸びが大きくなり過ぎてラッピング加工時の張力調整が難しくなる。   When the wrapping material 5 described above is constituted by a cord, the cord is constituted by a multifilament twisted cord, and the number of twists per 10 cm of the cord is 10 to 50, preferably 20 to 40. If the number of twists per 10 cm is less than 10, the fatigue resistance of the cord will be reduced, and if it exceeds 50, the elongation of the cord will be too large, making it difficult to adjust the tension during lapping.

本発明において、上述するコード又はモノフィラメントを複数本平行に引き揃えてゴム被覆した帯状体に形成し、この帯状体をグロメット３ｗの周囲に螺旋状に巻き付けるようにしてもよい。この場合における帯状体の巻き付けピッチは特に限定されないが、グロメット３ｗの単位長さ当たりコード又はモノフィラメントの本数が上記と同じ本数になるように帯状体を巻き付けるようにするとよい。   In the present invention, a plurality of the cords or monofilaments described above may be arranged in parallel to form a rubber-coated belt-like body, and the belt-like body may be spirally wound around the grommet 3w. The winding pitch of the strip in this case is not particularly limited, but the strip may be wound so that the number of cords or monofilaments per unit length of the grommet 3w is the same as the above.

上述するように、本発明の空気入りタイヤは、グロメットの周囲に螺旋状に巻き付けるラッピング材として高い熱収縮応力を有するＰＯＫ繊維からなるコード又はモノフィラメントを使用してビードコアを構成し、これを左右のビード部に埋設することにより、加硫時におけるグロメットの結束性を高めて、ビードコアの断面形状の崩れを防止し、リムとの嵌合性を向上させるもので、簡単な構成でありながら優れた効果を奏することから、乗用車用タイヤをはじめとした各種のタイヤに幅広く適用することができる。   As described above, the pneumatic tire of the present invention comprises a bead core using cords or monofilaments made of POK fibers having high heat shrinkage stress as a wrapping material wound spirally around a grommet, By embedding in the bead part, the grommet's bundling property during vulcanization is improved, the cross-sectional shape of the bead core is prevented from collapsing, and the fitting property with the rim is improved. Since it produces an effect, it can be widely applied to various tires including passenger car tires.

タイヤサイズを２２５／４５Ｒ１７、タイヤ構造を図１として、左右のビード部に埋設したビードコアにおけるラッピング材として表１に示すコードを巻き付けた本発明タイヤ（実施例）及び比較タイヤ（比較例１〜３）をそれぞれ作製した。なお、各タイヤにおいて、ビードコアを構成するグロメットの構造を６＋６＋６＋６＋５とし、スチールワイヤの素線径を１．２ｍｍと共通にした。   The tires of the present invention (Examples) and comparative tires (Comparative Examples 1 to 3) in which the cord shown in Table 1 is wound as a wrapping material in a bead core embedded in the left and right bead portions, with a tire size of 225 / 45R17 and a tire structure as shown in FIG. ) Were prepared. In each tire, the structure of the grommet constituting the bead core was 6 + 6 + 6 + 6 + 5, and the wire diameter of the steel wire was 1.2 mm.

これら４種のタイヤについて、以下の試験方法により、加硫後のビードコアの断面形状の変化状況を観察すると共に、リムとの嵌合性を評価し、その結果を表１に併記した。
〔加硫後のビードコアの断面形状の変化状況〕
加硫後のタイヤのビード部を切断して、ビードコアの断面形状の変化状況（表１において「加硫前後の形状変化」という）を観察し、その結果をＡ（変化なし）、Ｂ（やや変化あり）、Ｃ（変化大）の３段階に分けて表１に表示した。
〔リムとの嵌合性〕
タイヤビード部を同心円状に押し広げる治具を用いて、治具を同心円状に拡大したときにタイヤビード部から受ける反力（治具がビード部から受ける圧力と接触面積との積＝タイヤ嵌合力）を測定してリムとの嵌合性の評価とし、その結果をＡ（優れる）、Ｂ（良好）、Ｃ（劣る）、Ｄ（全く劣る）の４段階に分けて表１に表示した。
About these four types of tires, the following test method was used to observe the change in the cross-sectional shape of the bead core after vulcanization, and the fitting property with the rim was evaluated. The results are also shown in Table 1.
[Changes in cross-sectional shape of bead core after vulcanization]
The bead portion of the tire after vulcanization is cut, and the change in the cross-sectional shape of the bead core (referred to as “shape change before and after vulcanization” in Table 1) is observed. The results are shown in Table 1 in three stages of (with change) and C (large change).
[Matchability with rim]
Using a jig that concentrically pushes the tire bead part, the reaction force received from the tire bead part when the jig is enlarged concentrically (the product of the pressure and contact area the jig receives from the bead part = tire fitting The resultant force was measured to evaluate the fit with the rim, and the results were displayed in Table 1 in four stages: A (excellent), B (good), C (inferior), and D (very inferior). .

Figure 2008030504
Figure 2008030504

表１の結果から、ラッピング材としてＰＯＫ繊維コードを使用した本発明タイヤは、比較タイヤに比して、加硫後のタイヤにおけるビードコアに崩れが見られず、リムとの嵌合性を向上させていることがわかる。   From the results shown in Table 1, the tire of the present invention using the POK fiber cord as the wrapping material does not show a collapse in the bead core in the vulcanized tire and improves the fitting property with the rim, as compared with the comparative tire. You can see that

本発明の実施形態からなる空気入りタイヤを示す半断面図である。1 is a half sectional view showing a pneumatic tire according to an embodiment of the present invention. 図１のタイヤにおけるビードコアの一部を示す斜視図である。It is a perspective view which shows a part of bead core in the tire of FIG. 従来の加硫後のタイヤにおけるビード部の断面を示す写真である。It is a photograph which shows the cross section of the bead part in the conventional vulcanized tire.

符号の説明Explanation of symbols

１ 空気入りタイヤ
２ ビード部
３ ビードコア
３ｗ グロメット
４ カーカス層
５ ラッピング材
ｗ スチールワイヤ
DESCRIPTION OF SYMBOLS 1 Pneumatic tire 2 Bead part 3 Bead core 3w Grommet 4 Carcass layer 5 Wrapping material w Steel wire

Claims (5)

ゴム被覆したスチールワイヤを幅方向に配列すると共に、径方向に積層するように巻き重ねて環状のグロメットに形成し、該グロメットの周囲にラッピング材を螺旋状に巻き付けたビードコアを左右一対のビード部に埋設し、該ビードコアの周囲にカーカス層の両端部をタイヤ内側から外側に向けて折り返した空気入りタイヤにおいて、
前記ラッピング材を下記式（１）及び（２）により表される脂肪族ポリケトン繊維からなるコード又はモノフィラメントで構成した空気入りタイヤ。
−（ＣＨ2 −ＣＨ2 −ＣＯ）n −（Ｒ−ＣＯ）m − ・・・・・・（１）
（ここで、Ｒは炭素数が３以上のアルキレン基）
１．００≦（ｎ＋ｍ）／ｎ≦１．０５ ・・・・・・・・・・・・（２） The rubber-coated steel wires are arranged in the width direction, and are wound to be laminated in the radial direction to form an annular grommet, and a bead core in which a wrapping material is spirally wound around the grommet is a pair of left and right bead portions. Embedded in the pneumatic tire in which both ends of the carcass layer are folded back from the tire inner side to the outer side around the bead core,
A pneumatic tire in which the wrapping material is composed of cords or monofilaments made of aliphatic polyketone fibers represented by the following formulas (1) and (2).
— (CH 2 —CH 2 —CO) n — (R—CO) m — (1)
(Where R is an alkylene group having 3 or more carbon atoms)
1.00 ≦ (n + m) /n≦1.05 (2) 前記コード又はモノフィラメントの１５０℃における乾熱時の収縮応力が０．１９〜０．８１ｃＮ／ｄｔｅｘである請求項１に記載の空気入りタイヤ。   The pneumatic tire according to claim 1, wherein the cord or the monofilament has a shrinkage stress of 0.19 to 0.81 cN / dtex at the time of dry heat at 150 ° C. 前記コード又はモノフィラメントの太さが９００〜３３００ｄｔｅｘである請求項１又は２に記載の空気入りタイヤ。   The pneumatic tire according to claim 1 or 2, wherein a thickness of the cord or the monofilament is 900 to 3300 dtex. 前記コードがマルチフィラメントの撚りコードであって、１０ｃｍあたりの撚り数が１０〜５０である請求項１、２又は３に記載の空気入りタイヤ。   The pneumatic tire according to claim 1, 2 or 3, wherein the cord is a multifilament twist cord, and the number of twists per 10 cm is 10 to 50. 前記コード又はモノフィラメントを複数本平行に引き揃えてゴム被覆した帯状体に形成し、該帯状体を前記グロメットの周囲に螺旋状に巻き付けた請求項１、２、３又は４に記載の空気入りタイヤ。
The pneumatic tire according to claim 1, 2, 3 or 4, wherein a plurality of the cords or monofilaments are arranged in parallel to form a rubber-coated belt-like body, and the belt-like body is spirally wound around the grommet. .
JP2006202804A 2006-07-26 2006-07-26 Pneumatic tire Expired - Fee Related JP5028896B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012076653A (en) * 2010-10-04 2012-04-19 Yokohama Rubber Co Ltd:The Bead core for tire and pneumatic tire using the same
JP2013129234A (en) * 2011-12-20 2013-07-04 Bridgestone Corp Bead core and tire using the same
JP2014117978A (en) * 2012-12-13 2014-06-30 Sumitomo Rubber Ind Ltd Bead core, pneumatic tire using the same, and method for manufacturing pneumatic tire
JP2019182082A (en) * 2018-04-05 2019-10-24 横浜ゴム株式会社 Pneumatic tire

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JPS61253202A (en) * 1985-04-30 1986-11-11 Toyo Tire & Rubber Co Ltd Radial tire
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JP2012076653A (en) * 2010-10-04 2012-04-19 Yokohama Rubber Co Ltd:The Bead core for tire and pneumatic tire using the same
JP2013129234A (en) * 2011-12-20 2013-07-04 Bridgestone Corp Bead core and tire using the same
JP2014117978A (en) * 2012-12-13 2014-06-30 Sumitomo Rubber Ind Ltd Bead core, pneumatic tire using the same, and method for manufacturing pneumatic tire
JP2019182082A (en) * 2018-04-05 2019-10-24 横浜ゴム株式会社 Pneumatic tire
JP7073861B2 (en) 2018-04-05 2022-05-24 横浜ゴム株式会社 Pneumatic tires

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