JPH09267609A - Pneumatic radial tire - Google Patents
Pneumatic radial tireInfo
- Publication number
- JPH09267609A JPH09267609A JP8079863A JP7986396A JPH09267609A JP H09267609 A JPH09267609 A JP H09267609A JP 8079863 A JP8079863 A JP 8079863A JP 7986396 A JP7986396 A JP 7986396A JP H09267609 A JPH09267609 A JP H09267609A
- Authority
- JP
- Japan
- Prior art keywords
- bead
- tire
- reinforcing
- reinforcing rubber
- organic fiber
- 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.)
- Pending
Links
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気入りラジアル
タイヤに関し、さらに詳しくは、耐リム外れ性と操縦安
定性とを共に向上した乗用車用として好適な空気入りラ
ジアルタイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic radial tire, and more particularly to a pneumatic radial tire suitable for passenger cars having improved rim removal resistance and steering stability.
【０００２】[0002]
【従来の技術】近年、高速道路網の整備、車両の高性能
化に伴い、車両はますます高速運転される傾向を増して
きている。このような車両の高速化に伴い、車両と路面
とをつなぐタイヤに対しては、高速旋回時の高い操縦安
定性と耐リム外れ性が求められている。2. Description of the Related Art In recent years, with the development of highway networks and higher performance of vehicles, the tendency for vehicles to operate at high speed is increasing. With such speeding up of vehicles, tires that connect the vehicle to the road surface are required to have high steering stability and rim detachment resistance during high-speed turning.
【０００３】従来、上述したタイヤの操縦安定性向上の
対策として、特開平６−２２７２１６号公報は、図２に
示すようにビードトウ部にＪＩＳ硬度８０〜９８の高硬
度の補強ゴム８０と、この補強ゴム８０のタイヤ内側に
沿って有機繊維補強層９０を配置するようにしたものが
提案されている。As a conventional measure for improving the steering stability of the above-mentioned tire, Japanese Patent Laid-Open No. 6-227216 discloses a reinforcing rubber 80 having a high hardness of JIS hardness 80 to 98 in the bead toe portion as shown in FIG. It is proposed that the organic fiber reinforcing layer 90 is arranged along the tire inner side of the reinforcing rubber 80.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来タイヤのビードトウ部の構造では、操縦安定性を向上
できるものの、リムへの嵌合時に補強ゴムの欠けが生じ
易く、それが操縦安定性の低下だけでなく、高速旋回時
にリム外れを起こしやすくなるという欠点があった。
本発明の目的は、ビードトウ部に配置した補強ゴムのリ
ム嵌合時における欠けの発生を抑制し、耐リム外れ性と
操縦安定性とを共に向上した空気入りラジアルタイヤを
提供することにある。However, in the structure of the bead toe part of the conventional tire, although the steering stability can be improved, the reinforcing rubber is liable to be chipped when the tire is fitted on the rim, which lowers the steering stability. Not only that, but it also has the drawback that the rim tends to come off during high-speed turning.
An object of the present invention is to provide a pneumatic radial tire that suppresses the occurrence of chipping of the reinforcing rubber disposed in the bead toe portion during rim fitting, and improves both rim disengagement resistance and steering stability.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
の本発明は、ビード部のビードトウ部を補強ゴムと有機
繊維補強層とから補強してなる空気入りラジアルタイヤ
において、前記ビードトウ部に補強ゴムを配置し、該補
強ゴムをそのタイヤ内側と外側にそれぞれ配置した有機
繊維補強層で挟持し、かつこれら有機繊維補強層の両端
部同士を重ね合わせて一体化してなることを特徴とする
ものである。The present invention for achieving the above object provides a pneumatic radial tire in which a bead toe portion of a bead portion is reinforced with a reinforcing rubber and an organic fiber reinforcing layer, and the bead toe portion is reinforced. A rubber is disposed, the reinforcing rubber is sandwiched between organic fiber reinforcing layers disposed inside and outside the tire, and both end portions of these organic fiber reinforcing layers are overlapped and integrated. Is.
【０００６】このように、ビードトウ部に配置した補強
ゴムを二枚の有機繊維補強層にて挟持し、かつその有機
繊維補強層の両端部同士を重ね合わせて一体的に補強し
たことにより、補強ゴムに必要以上に高い硬度のゴムを
使用することなく、高速旋回時に必要な操縦安定性のた
めの高い剛性を得ることができるので、リムへの装着時
に補強ゴムの欠けを生ずることがない。したがって、耐
リム外れ性と操縦安定性を共に向上させることができ
る。As described above, the reinforcing rubber disposed in the bead toe portion is sandwiched between the two organic fiber reinforcing layers, and both ends of the organic fiber reinforcing layers are overlapped with each other to integrally reinforce the reinforcing rubber. Since it is possible to obtain a high rigidity for steering stability required during high-speed turning without using a rubber having a hardness higher than necessary, it is possible to prevent the reinforcing rubber from being chipped when mounted on the rim. Therefore, it is possible to improve both the rim detachment resistance and the steering stability.
【０００７】[0007]
【発明の実施の形態】以下、図に示す実施形態にもとづ
いて本発明を具体的に説明する。図１は、本発明の乗用
車用としての空気入りラジアルタイヤのビード部１の一
例を示した断面図で、リム１１に装着されている状態を
示している。図１に示すように、ビード部１には、カー
カス層２の端部がビードコア３の廻りにタイヤ内側から
外側に略三角断面形状のビードフィラー４を包み込むよ
うに折り返された構成となっている。また、ビード部１
は、リム１１と接するタイヤ外側にビードヒール部６を
形成し、タイヤ内側にビードトウ部５を形成している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on an embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing an example of a bead portion 1 of a pneumatic radial tire for passenger cars of the present invention, showing a state in which it is mounted on a rim 11. As shown in FIG. 1, in the bead portion 1, an end portion of the carcass layer 2 is folded back around the bead core 3 so as to wrap around a bead filler 4 having a substantially triangular cross section from the tire inner side to the outer side. . Also, the bead part 1
Forms a bead heel portion 6 on the outer side of the tire in contact with the rim 11 and forms a bead toe portion 5 on the inner side of the tire.
【０００８】ビードトウ部５には、ビードコア３よりタ
イヤ内側に補強ゴム８が配置されている。補強ゴム８
は、ビードトウ部５に対応する中央部分が最も厚く、両
端部に向かって薄く漸減している。この補強ゴム８を間
に挟んで、補強ゴム８のタイヤ内側に沿う有機繊維補強
層９ａと、補強ゴム８の外側に沿う有機繊維補強層９ｂ
とが配置されている。この二枚の有機繊維補強層９ａ、
９ｂは、各々の両端部同士が重ね合わされ、ビードコア
３の外径外側に位置する重ね合わせ部１０ａとタイヤ軸
方向外側端よりビードヒール６側に位置する重ね合わせ
部１０ｂとを形成している。In the bead toe portion 5, a reinforcing rubber 8 is arranged inside the tire from the bead core 3. Reinforcement rubber 8
Is thickest in the central portion corresponding to the bead toe portion 5, and gradually decreases toward both end portions. An organic fiber reinforcing layer 9a extending along the tire inner side of the reinforcing rubber 8 and an organic fiber reinforcing layer 9b extending outside the reinforcing rubber 8 with the reinforcing rubber 8 interposed therebetween.
And are arranged. These two organic fiber reinforcing layers 9a,
Both ends of the bead 9b are superposed on each other to form a superposed part 10a located outside the outer diameter of the bead core 3 and a superposed part 10b located closer to the bead heel 6 than the outer end in the tire axial direction.
【０００９】上述したように、ビードトウ部５に補強ゴ
ム８を配置し、この補強ゴム８を二枚の有機繊維補強層
９ａ、９ｂにて挟持し、かつこの二枚の有機繊維補強層
９ａ、９ｂの両端部同士を重ね合わせて一体的に補強し
た構成とすることにより、補強ゴム８として必要以上に
高硬度のゴムを使用しなくても高速旋回時におけるビー
ドの倒れ込みが減少し、操縦安定性を向上することがで
きる。As described above, the reinforcing rubber 8 is arranged in the bead toe portion 5, the reinforcing rubber 8 is sandwiched between the two organic fiber reinforcing layers 9a and 9b, and the two organic fiber reinforcing layers 9a, By constructing a structure in which both ends of 9b are overlapped with each other and integrally reinforced, bead collapse during high-speed turning is reduced and stable steering is achieved without using a rubber having a hardness higher than necessary as the reinforcing rubber 8. It is possible to improve the property.
【００１０】また、補強ゴム８に必要以上に高硬度のゴ
ムを使用することがないので、リム装着時に補強ゴムに
欠けを生ずることがなくリム組みがし易くなり、耐リム
外れ性の低下や操縦安定性の低下を来すことがない。上
述したビード部の構成において補強ゴム８の硬度は、Ｊ
ＩＳ Ａ硬度で８０〜９０が好ましく、さらに好ましく
は８０〜８５である。ＪＩＳ Ａ硬度８０未満では、リ
ム組み性は良くなるものの、たとえ二枚の有機補強繊維
層９ａ、９ｂに挟持されていても、高速回転時における
ビード倒れ込みが発生し、高い操縦安定性の確保が難し
くなる。また、ゴムの硬度が、ＪＩＳ Ａ９０超では、
剛性が高くなりすぎ、リム組み性が悪化する。Further, since a rubber having a hardness higher than necessary is not used as the reinforcing rubber 8, the reinforcing rubber is not chipped when the rim is mounted, the rim is easily assembled, and the rim detachment resistance is deteriorated. There is no reduction in steering stability. In the structure of the bead portion described above, the hardness of the reinforcing rubber 8 is J
The ISA hardness is preferably 80 to 90, more preferably 80 to 85. When the JIS A hardness is less than 80, the rim assembly property is improved, but even if it is sandwiched between the two organic reinforcing fiber layers 9a and 9b, bead collapse occurs at high speed rotation, and high steering stability can be secured. It gets harder. In addition, when the hardness of rubber exceeds JIS A90,
The rigidity becomes too high and the rim assembly performance deteriorates.
【００１１】また、補強ゴム８の中央域での最大厚さ
は、３ｍｍ以上であることが好ましく、さらに好ましく
は３〜５ｍｍである。３ｍｍ未満では十分な剛性を得る
ことができず、５ｍｍ以上ではビード部の剛性が高くな
り、リム組み性が悪化する。有機繊維補強層９ａ、９ｂ
に使用する繊維としては、アラミド繊維、ナイロン繊
維、ポリエステル繊維等有機繊維からなるものであれば
いずれでもよいが、高い剛性を得るためには、アラミド
繊維が好ましい。The maximum thickness of the reinforcing rubber 8 in the central region is preferably 3 mm or more, more preferably 3 to 5 mm. If it is less than 3 mm, sufficient rigidity cannot be obtained, and if it is 5 mm or more, the rigidity of the bead portion becomes high and the rim assembly property deteriorates. Organic fiber reinforcing layers 9a, 9b
Any fiber may be used as the fiber as long as it is made of an organic fiber such as aramid fiber, nylon fiber, polyester fiber, etc., but aramid fiber is preferable in order to obtain high rigidity.
【００１２】前述したように有機繊維補強層９ａ、９ｂ
の重ね合わせ部１０ａのリム径からのタイヤ径方向の高
さＨ1 は、ビードコア３のリム径からのタイヤ径方向の
高さＨ2 よりも高い位置に配置する。また、有機繊維補
強層９ａ、９ｂの他の重ね合わせ部１０ｂは、ビードコ
ア３のタイヤ軸方向外側端Ａを越えてビードヒール６側
に配置する。好ましくは、ビードコア３のタイヤ軸方向
外側端Ａから２〜３ｍｍ延ばした長さとする。重ね合わ
せ部１０ａ、１０ｂを共に上記配置とすることにより、
上述した本発明の効果を一層向上することができる。As described above, the organic fiber reinforcing layers 9a and 9b
The height H 1 of the overlapping portion 10a in the tire radial direction from the rim diameter is higher than the height H 2 of the bead core 3 in the tire radial direction from the rim diameter. The other overlapping portion 10b of the organic fiber reinforcing layers 9a and 9b is arranged on the bead heel 6 side beyond the tire axial outer end A of the bead core 3. Preferably, the length of the bead core 3 is extended from the axially outer end A of the bead core 3 by 2 to 3 mm. By arranging the overlapping portions 10a and 10b together as described above,
The effects of the present invention described above can be further improved.
【００１３】また、有機繊維補強層９ａ、９ｂの両端部
の重ね合わせ部１０ａ、１０ｂの長さＳは、いずれも５
ｍｍ以上にすることが好ましい。このように５ｍｍ以上
とすることにより、本発明の効果がさらに向上する。The lengths S of the overlapping portions 10a and 10b at both ends of the organic fiber reinforcing layers 9a and 9b are both 5
mm or more is preferable. By setting the thickness to 5 mm or more, the effect of the present invention is further improved.
【００１４】[0014]
【実施例】タイヤサイズが２３５／４５ＺＲ１７、ビー
ド部構造が図１であり、補強ゴムの硬度がＪＩＳ Ａ８
０、二枚の繊維補強層をアラミド繊維から構成、重ね合
わせ部１０ａのタイヤ径方向の高さＨ1 を１５ｍｍ（ビ
ードコア高さＨ2 ＝１０ｍｍ）、ビードコアのタイヤ軸
方向外側端部からの延長距離を２ｍｍ、重ね合わせ部の
長さＳを５ｍｍとした本発明タイヤを製作した。[Example] The tire size is 235 / 45ZR17, the bead structure is shown in FIG. 1, and the hardness of the reinforcing rubber is JIS A8.
0, two fiber reinforcing layers made of aramid fiber, the height H 1 of the overlapping portion 10a in the tire radial direction is 15 mm (bead core height H 2 = 10 mm), and the extension of the bead core from the tire axial outer end A tire of the present invention having a distance of 2 mm and an overlapping portion length S of 5 mm was manufactured.
【００１５】比較として、本発明タイヤと同一タイヤサ
イズで、図２に示すようなビード構造を有し、補強ゴム
のＪＩＳ Ａ硬度９０、繊維補強層がアラミド繊維から
なる従来タイヤを製作した。また、二枚の有機繊維補強
層の両端部同士を重ね合わせていないこと以外は本発明
と同一構造とした比較タイヤを製作した。As a comparison, a conventional tire having the same tire size as the tire of the present invention, a bead structure as shown in FIG. 2, a JIS A hardness of reinforcing rubber of 90, and a fiber reinforcing layer of aramid fiber was manufactured. In addition, a comparative tire having the same structure as the present invention was manufactured except that both ends of the two organic fiber reinforcing layers were not overlapped.
【００１６】３種類の試験タイヤについて、下記試験法
により、操縦安定性、リム組み性、耐リム外れ性につい
て評価を行った。評価の結果は、表１に示すとおりであ
った。 （試験方法） 操縦安定性：試験タイヤを１７×８ＪＪのリムに装着
し、空気圧２００ｋＰａ、荷重４．４１ｋＮ、速度を１
０ｋｍ／ｈとし、スリップ角を０〜１５°に変化させて
室内フラットベルト式試験機上を走行させ、リムチェッ
クラインにおけるビードの倒れ込み状態をビデオにて撮
影した。ビデオを再現して倒れ込み量を測定し、操縦安
定性の目安とした。Three types of test tires were evaluated for steering stability, rim assembly property, and rim detachment resistance by the following test methods. The evaluation results were as shown in Table 1. (Test method) Steering stability: A test tire was mounted on a rim of 17 × 8JJ, an air pressure of 200 kPa, a load of 4.41 kN, and a speed of 1.
It was 0 km / h, the slip angle was changed from 0 to 15 °, and the vehicle was run on an indoor flat belt type tester, and a bead collapse state on the rim check line was videotaped. The video was reproduced to measure the amount of collapse and used as a guide for steering stability.
【００１７】評価は測定値の逆数で行い、従来タイヤを
１００とする指数で示した。指数値が大きいほど操縦安
定性に優れていることを意味する。 リム組み性：各タイヤのリム組み作業を行い、作業の容
易性を評価した。評価は、従来タイヤを１００とする指
数で示した。指数値が大きいほどリム組み性が優れてい
ることを意味する。 耐リム外れ性：リムに装着したタイヤをビード部の外側
から横力を加え、ビード部がリム外れを生じた時の横力
を測定した。評価は、従来タイヤの測定値を１００とす
る指数で示し、指数値が大きいほど耐リム外れ性が優れ
ていることを意味する。The evaluation was carried out by the reciprocal of the measured value, and it was shown by an index with the conventional tire being 100. The larger the index value, the better the steering stability. Rim assembly performance: The rim assembly work for each tire was performed and the ease of work was evaluated. The evaluation is shown by an index with the conventional tire being 100. The larger the index value, the better the rim assembly property. Resistance to rim detachment: Lateral force was applied to the tire mounted on the rim from the outside of the bead portion, and the lateral force when the bead portion caused rim detachment was measured. The evaluation is shown by an index with the measured value of the conventional tire being 100, and the larger the index value, the better the rim detachment resistance.
【００１８】 表１から、本発明のタイヤは、従来タイヤ、比較タイヤ
に比べてリム組み性を良好に維持しつつ、操縦安定性及
び耐リム外れ性が向上していることが分かる。[0018] It can be seen from Table 1 that the tire of the present invention has improved rim assembling property and improved steering stability and rim disengagement resistance as compared with the conventional tire and the comparative tire.
【００１９】[0019]
【発明の効果】上述したように、本発明の空気入りラジ
アルタイヤは、ビードトウ部に配置した補強ゴムを二枚
の有機繊維補強層にて挟持し、かつこれら有機補強繊維
の両端部同士を重ね合わせて一体的に補強したので、補
強ゴムに必要以上に高硬度のゴムを使用することなく高
い操縦安定性を確保することができ、リム嵌合時の補強
ゴム欠けの発生を抑制するため、耐リム外れ性と操縦安
定性とを共に向上させることができる。As described above, in the pneumatic radial tire of the present invention, the reinforcing rubber arranged in the bead toe portion is sandwiched between the two organic fiber reinforcing layers, and both end portions of these organic reinforcing fibers are overlapped with each other. Since it is reinforced integrally together, it is possible to secure high steering stability without using a rubber having a hardness higher than necessary for the reinforcing rubber, and to suppress the occurrence of the reinforcing rubber chip when the rim is fitted, It is possible to improve both the rim detachment resistance and the steering stability.
【図１】本発明のタイヤのビード部を示す縦断面図であ
る。FIG. 1 is a vertical sectional view showing a bead portion of a tire of the present invention.
【図２】従来タイヤのビード部を示す縦断面図である。FIG. 2 is a vertical cross-sectional view showing a bead portion of a conventional tire.
１ ビード部 ２ カーカス層 ３ ビードコア ５ ビードトウ部 ６ ビードヒール部 ８ 補強ゴム ９ａ、９ｂ 有機繊維補強層 １０ａ、１０ｂ 重ね
合わせ部1 bead part 2 carcass layer 3 bead core 5 bead toe part 6 bead heel part 8 reinforcing rubber 9a, 9b organic fiber reinforcing layer 10a, 10b superposed part
Claims (5)
機繊維補強層とから補強してなる空気入りラジアルタイ
ヤにおいて、前記ビードトウ部に補強ゴムを配置し、該
補強ゴムをそのタイヤ内側と外側にそれぞれ配置した有
機繊維補強層で挟持し、かつこれら有機繊維補強層の両
端部同士を重ね合わせて一体化してなる空気入りラジア
ルタイヤ。1. A pneumatic radial tire in which a bead toe portion of a bead portion is reinforced with a reinforcing rubber and an organic fiber reinforcing layer, wherein a reinforcing rubber is arranged in the bead toe portion and the reinforcing rubber is provided inside and outside the tire. A pneumatic radial tire which is sandwiched between organic fiber reinforcing layers arranged respectively, and both ends of these organic fiber reinforcing layers are overlapped and integrated.
わせ部の一方をビードコアの外径より外側に配置し、他
方をビードコアのタイヤ軸方向外側端よりビートヒール
側に配置した請求項１に記載の空気入りラジアルタイ
ヤ。2. The organic fiber reinforcing layer, wherein one of the overlapping portions of both ends thereof is arranged outside the outer diameter of the bead core, and the other is arranged on the beat heel side of the tire axial outer end of the bead core. Pneumatic radial tire as described in.
合わせ部の長さが５ｍｍ以上である請求項１または２に
記載の空気入りラジアルタイヤ。3. The pneumatic radial tire according to claim 1, wherein the length of the overlapping portion between both ends of the organic fiber reinforcing layer is 5 mm or more.
する部分の厚さが３ｍｍ以上である請求項１〜３のいず
れか１項に記載の空気入りラジアルタイヤ。4. The pneumatic radial tire according to claim 1, wherein a thickness of a portion of the reinforcing rubber corresponding to the bead toe portion is 3 mm or more.
８０〜９０である請求項１〜４のいずれか１項に記載の
空気入りラジアルタイヤ。5. The pneumatic radial tire according to claim 1, wherein the hardness of the reinforcing rubber is JIS A hardness of 80 to 90.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8079863A JPH09267609A (en) | 1996-04-02 | 1996-04-02 | Pneumatic radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8079863A JPH09267609A (en) | 1996-04-02 | 1996-04-02 | Pneumatic radial tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09267609A true JPH09267609A (en) | 1997-10-14 |
Family
ID=13702049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8079863A Pending JPH09267609A (en) | 1996-04-02 | 1996-04-02 | Pneumatic radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09267609A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003072325A (en) * | 2001-09-05 | 2003-03-12 | Bridgestone Corp | Radial tire for heavy load |
| JP2009196552A (en) * | 2008-02-22 | 2009-09-03 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| US7793693B2 (en) | 2003-12-12 | 2010-09-14 | Bridgestone Corporation | Pneumatic tire with specified toe rubber |
| KR200465068Y1 (en) * | 2011-09-02 | 2013-01-31 | 금호타이어 주식회사 | Pneumatic tire with strengthened bead |
| WO2015190384A1 (en) * | 2014-06-13 | 2015-12-17 | 株式会社ブリヂストン | Tire |
-
1996
- 1996-04-02 JP JP8079863A patent/JPH09267609A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003072325A (en) * | 2001-09-05 | 2003-03-12 | Bridgestone Corp | Radial tire for heavy load |
| JP4642291B2 (en) * | 2001-09-05 | 2011-03-02 | 株式会社ブリヂストン | Heavy duty radial tire |
| US7793693B2 (en) | 2003-12-12 | 2010-09-14 | Bridgestone Corporation | Pneumatic tire with specified toe rubber |
| JP2009196552A (en) * | 2008-02-22 | 2009-09-03 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| KR200465068Y1 (en) * | 2011-09-02 | 2013-01-31 | 금호타이어 주식회사 | Pneumatic tire with strengthened bead |
| WO2015190384A1 (en) * | 2014-06-13 | 2015-12-17 | 株式会社ブリヂストン | Tire |
| CN106457929A (en) * | 2014-06-13 | 2017-02-22 | 株式会社普利司通 | Tire |
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