JP2001018620A - Reinforcing structure for tire bead part - Google Patents
Reinforcing structure for tire bead partInfo
- Publication number
- JP2001018620A JP2001018620A JP11190770A JP19077099A JP2001018620A JP 2001018620 A JP2001018620 A JP 2001018620A JP 11190770 A JP11190770 A JP 11190770A JP 19077099 A JP19077099 A JP 19077099A JP 2001018620 A JP2001018620 A JP 2001018620A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- tire
- rubber
- reinforcing structure
- filler
- 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
- Ropes Or Cables (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はタイヤのビード部の
補強構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reinforcing a bead portion of a tire.
【０００２】[0002]
【従来の技術】一般にタイヤのビード部には、硬鋼線よ
りなる環状のビードコアと、その外周に貼着された断面
三角形状の硬質ゴム製のエイペックスと、この両者の変
位防止のためのフリッパーより成るビードワイヤーが埋
設されている。カーカスコードの固定と、リムとの緊締
のための内周長の確保というビードワイヤー本来の要素
の外に、高速化、高性能化に伴い別の要素、例えば剛性
の向上とか或いは走行路変更に伴うタイヤの姿勢復帰の
迅速化などの形で、特にタイヤのビード部への要請が高
まっている。エイペックスの形状の改良とか、エイペッ
クスの硬質ゴム質の改善とか更には異質の硬質ゴムの併
用など次々に改善が試みられたが、この種のエイペック
ス単体だけでは問題の解消は困難で、エイペックスの側
部に新しく補強構造を付加する試みがなされるようにな
った。2. Description of the Related Art In general, a bead portion of a tire has an annular bead core made of a hard steel wire, a hard rubber apex affixed to the outer periphery thereof having a triangular cross section, and a displacement preventive member for preventing displacement of the two. A bead wire consisting of a flipper is embedded. In addition to the original element of the bead wire, which secures the carcass cord and secures the inner circumference for tightening with the rim, another element such as improvement of rigidity or change of the running path with higher speed and higher performance In particular, there is a growing demand for tire bead portions, for example, in such a way as to speed up the return of the tire position. Improvement of the shape of the Apex, improvement of the hard rubber quality of the Apex and further improvement such as combined use of different kinds of hard rubber were tried one after another, but it was difficult to solve the problem only with this kind of Apex alone, Attempts have been made to add new reinforcement structures to the sides of the Apex.
【０００３】ゴム被覆されたスチールコードをビードコ
アの周方向とは或る角度を持たせて、即ち、タイヤ周方
向よりタイヤ径方向に立たせた状態で配置した補強構造
で、これをスチールフィラーと命名した。実用化の結
果、縦剛性が強くなり過ぎて乗心地の点で敬遠されがち
となり、更にはスチールコードの切断端面が走行中のタ
イヤの縦剛性を受け易く、その結果、繰返しの運動によ
り、ゴムとの接着力の点で問題が発生し、スチールコー
ドの切断端面をゴム引布でカバーする必要によりコスト
高となってしまった。更にはスチールフィラーをエイペ
ックスに貼着する作業の性質上、スチールフィラーのタ
イヤ径方向の高さが不揃いとなり、品質上の欠陥からこ
の構造が広く採用されるまでには至っていない。スチー
ルに代えて非金属コードでも試験されたが剛性面で満足
できず採用も限定的である。[0003] A reinforcing structure in which a rubber-coated steel cord is arranged at a certain angle with respect to the circumferential direction of the bead core, that is, in a state of standing in the tire radial direction from the tire circumferential direction, is called a steel filler. did. As a result of practical use, the longitudinal rigidity becomes too strong and it tends to be avoided in terms of riding comfort, and furthermore, the cut end surface of the steel cord is easily affected by the longitudinal rigidity of the running tire, and as a result, the rubber A problem arises with respect to the adhesive strength of the steel cord, and the cost is increased due to the necessity of covering the cut end surface of the steel cord with a rubberized cloth. Furthermore, due to the nature of the work of attaching the steel filler to the apex, the height of the steel filler in the tire radial direction is not uniform, and this structure has not been widely adopted due to quality defects. Non-metal cords were also tested in place of steel, but their rigidity was unsatisfactory and their adoption was limited.
【０００４】前記のスチールフィラーの欠陥、即ち、ス
チールコードの切断端面とゴムとの接着不足、高さの不
揃いによる品質面の問題などを解消すべく、ゴム被覆金
属コードをビードコアとほぼ平行に周方向に巻回積層す
る改良型スチールフィラーが提案された。[0004] In order to solve the above-mentioned defects of the steel filler, that is, insufficient bonding between the cut end surface of the steel cord and the rubber and quality problems due to uneven height, the rubber-coated metal cord is wrapped substantially parallel to the bead core. An improved steel filler that is wound and laminated in one direction has been proposed.
【０００５】[0005]
【発明が解決しようとする課題】ところがこの改良型ス
チールフィラーを採用した時には、タイヤ成形の最終膨
脹時とか加硫タイヤを金型から取出す時とか、或いは、
走行中の空気圧異常低下時などタイヤのトロイダル形状
の大きな変化の時などにスチールフィラーに波形変形が
発生し、最悪の場合にはスチールコードの折損事故も皆
無とは言えないことが確認された。However, when the improved steel filler is employed, it may be necessary to perform the final expansion of the tire molding, the removal of the vulcanized tire from the mold, or
It was confirmed that when the toroidal shape of the tire significantly changed, such as when the air pressure abnormally decreased during running, the steel filler deformed in a waveform, and in the worst case, there was no steel cord breakage accident.
【０００６】本発明は上記従来の技術に存する問題点に
着目してなされたものであって、その第１の目的は、タ
イヤの縦剛性、横剛性、前後剛性及び捩りトルク等の強
度を向上させることができ、しかもタイヤのトロイダル
変形時にもスチールフィラーが波形変形することのない
タイヤのビード部の補強構造を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art. A first object of the present invention is to improve the strength of a tire such as longitudinal rigidity, lateral rigidity, longitudinal rigidity, and torsional torque. Another object of the present invention is to provide a reinforcing structure for a bead portion of a tire, which can prevent the steel filler from being deformed in a waveform even when the tire is toroidally deformed.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
めに請求項１の発明では、ゴム被覆金属コードの長さ方
向に切断箇所を許容しながら、かつ、積層方向に間隔を
保ちながらビードコアとほぼ平行方向の周方向に巻回積
層したスチールフィラーを配した補強構造である。In order to achieve the above object, according to the first aspect of the present invention, a bead core is provided while allowing a cut portion in a longitudinal direction of a rubber-coated metal cord and maintaining a gap in a laminating direction. This is a reinforcement structure in which a steel filler wound and laminated in a circumferential direction substantially parallel to the above is arranged.
【０００８】請求項２の発明では、夫々直径の異なる独
立リングが間隔を保ちながら積層されているスチールフ
ィラーの補強構造である。請求項３の発明では、層間に
間隔を有する渦巻き形状のスチールフィラーの補強構造
である。[0008] The invention according to claim 2 is a reinforcing structure of a steel filler in which independent rings having different diameters are laminated while keeping a distance therebetween. According to the third aspect of the invention, there is provided a reinforcing structure of a spiral-shaped steel filler having an interval between layers.
【０００９】[0009]
【作用】上記構成の請求項１の発明においては、伸びを
許容する撚り構造のゴム被覆金属コードを切断箇所を許
容しながら巻回積層しているので、タイヤのトロイダル
変形時においても十分対応できる。According to the first aspect of the present invention, since the rubber-coated metal cord having a twisted structure that allows elongation is wound and laminated while allowing the cut portion, it can sufficiently cope with the toroidal deformation of the tire. .
【００１０】請求項２の発明においては、巻回積層して
いるゴム被覆金属コードの夫々は独立しており、層間は
間隔を保っており、互いに干渉し合わないのでタイヤの
トロイダル変形時における対応は請求項１の場合より尚
余裕を有する。According to the second aspect of the present invention, each of the rubber-coated metal cords wound and laminated is independent of each other, the gap between the layers is maintained, and they do not interfere with each other. Has more margin than in the first aspect.
【００１１】請求項３の発明においては巻回積層してい
るゴム被覆金属コードは切断箇所が必ずしも一層毎に必
要ではないので請求項１及び請求項２の作用に加えて製
作能率的には請求項１及び請求項２の場合より有効であ
る。According to the third aspect of the present invention, the rubber-coated metal cord wound and laminated does not necessarily require a cut portion for each layer. Therefore, in addition to the effects of the first and second aspects, the production efficiency is reduced. It is more effective than the cases of claim 1 and claim 2.
【００１２】[0012]
【実施例】以下、本発明を具体化した実施例を図１〜図
６に従って説明する。図１は空気入りタイヤ１の横断面
を示す図であって、カーカス層２のターンアップ部、即
ち、ビード部３には環状の硬鋼線よりなるビードコア４
と、その外周に貼着された断面三角形状の硬質ゴム製の
エイペックス５及びビードコア４とほぼ平行方向に巻回
積層された複数のスチールフィラー６がエイペックス５
の一側部に貼着された状態でタイヤ１に埋設されてい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a cross section of a pneumatic tire 1, in which a bead core 4 made of an annular hard steel wire is provided at a turn-up portion of a carcass layer 2, that is, a bead portion 3.
And an apex 5 made of hard rubber having a triangular cross section and a plurality of steel fillers 6 wound and laminated in a direction substantially parallel to the bead core 4.
And is embedded in the tire 1 in a state of being attached to one side of the tire 1.
【００１３】スチールフィラー６は、図２及び図３に示
す直線状のゴム被覆スチールコード１０ｓ又は波状ウェ
ーブを施されたゴム被覆スチールコード１０ｗの何れか
のコード（以下ゴム被覆スチールコード１０と表示す
る）で構成されている。ゴム被覆スチールコード１０で
８層に構成されたスチールフィラー６は夫々直径の異な
る独立したリング１１，１２，・・・１８のように不等
ピッチで配置されており、各リング１１，１２，・・・
１８は夫々１８０度隔てて対向する２箇所、即ち１１−
１，１１−２，１２−１，１２−２，・・・１８−１，
１８−２の位置において切断箇所を設けている。切断箇
所１１−１，１１−２，１２−１，１２−２，・・・１
８−１，１８−２は径方向に夫々重複しない計算された
位置に決められている。また、独立したリング１１，１
２，・・・１８の積層間隔は１１と１２，１３と１４，
１５と１６及び１７と１８の間隔ｄ１、ｄ２、ｄ３、ｄ
４はｄ１＝ｄ２＝ｄ３＝ｄ４である。１２と１３、１４
と１５、１６と１７の間隔Ｄ１，Ｄ２，Ｄ３はＤ１＝Ｄ
２＝Ｄ３であるが、Ｄ１＝Ｄ２＝Ｄ３＞ｄ１＝ｄ２＝ｄ
３＝ｄ４である。The steel filler 6 is either a straight rubber-coated steel cord 10s or a rubber-coated steel cord 10w having a wavy wave shown in FIGS. 2 and 3 (hereinafter referred to as a rubber-coated steel cord 10). ). Steel fillers 6 composed of eight layers of rubber-coated steel cords 10 are arranged at unequal pitches like independent rings 11, 12,... 18 having different diameters, and each ring 11, 12,.・ ・
Numerals 18 denote two places facing each other at 180 degrees, that is, 11-
1, 11-2, 12-1, 12-2, ... 18-1,
A cutting portion is provided at the position 18-2. Cutting locations 11-1, 11-2, 12-1, 12-2,... 1
8-1 and 18-2 are determined at calculated positions that do not overlap in the radial direction. In addition, independent rings 11, 1
The stacking intervals of 2,... 18 are 11 and 12, 13 and 14,
Distances d1, d2, d3, d between 15 and 16 and 17 and 18
4 is d1 = d2 = d3 = d4. 12 and 13, 14
And 15, 16 and 17, the distances D1, D2 and D3 are D1 = D
2 = D3, but D1 = D2 = D3> d1 = d2 = d
3 = d4.
【００１４】また、図４及び図５に示すスチールフィラ
ー６はゴム被覆スチールコード１０によって２１，２
２，・・・３０のように間隔を保ちながら渦巻き状に巻
回積層されている。巻回のスタート２１−ｓから２層目
のほぼ５／６の位置で切断箇所２２−ｓを設け、周方向
に距離ｈを空け、かつ層２１と２２の間隔ｄ５よりも大
きい間隔Ｄ５を空けた位置２２−ｓより２層目即ち層２
２の残り１／６からの巻回を始めている。同様にして２
４−ｓ，２６−ｓ，２８−ｓから巻回をスタートさせ、
３０−Ｅ点で巻回積層を完了している。層２１と２２，
２３と２４，２５と２６、２７と２８，２９と３０の間
隔ｄ５、ｄ６、ｄ７、ｄ８、ｄ９の関係はｄ５＝ｄ６＝
ｄ７＝ｄ８＝ｄ９である。巻始め位置２２−ｓ，２４−
ｓ，２６−ｓ，２８−ｓが前述の如く間隔を広く空けて
いるので２２と２３，２４と２５，２６と２７，２８と
２９の間隔Ｄ５、Ｄ６、Ｄ７、Ｄ８の関係はＤ５＝Ｄ６
＝Ｄ７＝Ｄ８であるがＤ５＝Ｄ６＝Ｄ７＝Ｄ８＞ｄ５＝
ｄ６＝ｄ７＝ｄ８＝ｄ９である。The steel filler 6 shown in FIG. 4 and FIG.
The layers are spirally wound and laminated while maintaining an interval like 2, 30,. A cutting point 22-s is provided at approximately 5/6 of the second layer from the start 21-s of the winding, a distance h is provided in the circumferential direction, and a distance D5 larger than the distance d5 between the layers 21 and 22 is provided. Layer 2 from the position 22-s
The winding from the remaining 1/6 of 2 has begun. Similarly, 2
Start winding from 4-s, 26-s, 28-s,
The winding lamination is completed at the point 30-E. Layers 21 and 22,
The relationship between the distances d5, d6, d7, d8, and d9 between 23 and 24, 25 and 26, 27 and 28, and 29 and 30 is d5 = d6 =
d7 = d8 = d9. Winding start position 22-s, 24-
Since s, 26-s and 28-s are widely spaced as described above, the relationship between the intervals D5, D6, D7 and D8 between 22, 23, 24, 25, 26 and 27, 28 and 29 is D5 = D6.
= D7 = D8, but D5 = D6 = D7 = D8> d5 =
d6 = d7 = d8 = d9.
【００１５】なお、上記実施形態は、例えば、以下のよ
うに構成を適宜変更することもできる。 ・上記実施形態では、スチールフィラーは８層よりなる
スチールコードで構成されていたが、このスチールコー
ドの層数は、適宜変更してもよい。例えば、９層、１０
層等としてもよい。The above embodiment can be modified as appropriate, for example, as follows. -In the said embodiment, although the steel filler was comprised by the steel cord which consists of eight layers, the number of layers of this steel cord may be changed suitably. For example, 9 layers, 10 layers
It may be a layer or the like.
【００１６】[0016]
【発明の効果】上記のように構成した本発明のタイヤの
ビード部の補強構造では、伸びを許容する撚り構造のゴ
ム被覆金属コード１０がビードコア４とほぼ平行に周方
向に切断箇所を介在許容するとともに、積層方向に間隔
を保ちながら巻回積層されているスチールフィラー６の
採用によりタイヤ成形の最終膨脹時とか、加硫タイヤを
金型から取出すとき、又は第６図に示すような走行中の
タイヤの空気圧異常低下時など、タイヤのトロイダル形
状が大きく変化する時においても、撚り構造と切断箇所
の介在と層間ゴム層とによりスチールフィラー６の波形
変形を防止することができた。スチールフィラー６には
ゴム被覆金属コード１０の切断箇所が数多く介在してい
るが、スチールフィラー全体に占めるその容積比は極め
て微々たるものであり、タイヤに要求される縦剛性、横
剛性、前後剛性及び捩りトルク等の強度面も十分満足で
きる。切断箇所におけるゴムとの接着性の心配について
はスチールフィラーの巻回方向がビードコア４と平行な
周方向であるため、タイヤの径方向からの縦剛性の影響
も極めて少なく接着不具合の心配も全くない。According to the structure for reinforcing the bead portion of the tire of the present invention constructed as described above, the rubber-coated metal cord 10 having a twist structure allowing elongation can intervene in the circumferential direction in a direction substantially parallel to the bead core 4. At the same time, the steel filler 6 wound and laminated while maintaining the interval in the laminating direction is used for the final inflation of the tire molding, when the vulcanized tire is removed from the mold, or during running as shown in FIG. Even when the toroidal shape of the tire greatly changes, such as when the air pressure of the tire is abnormally reduced, it is possible to prevent the steel filler 6 from being deformed by the twisted structure, the interposition of the cut portion, and the interlayer rubber layer. The steel filler 6 has a number of cut portions of the rubber-coated metal cord 10 interposed therebetween. However, the volume ratio of the steel filler 6 to the entire steel filler is extremely small, and the longitudinal rigidity, lateral rigidity, longitudinal rigidity required for the tire are required. Also, strength such as torsional torque can be sufficiently satisfied. Regarding the concern of adhesiveness to rubber at the cut portion, the winding direction of the steel filler is the circumferential direction parallel to the bead core 4, so the influence of longitudinal rigidity from the tire radial direction is extremely small and there is no concern about adhesion failure. .
【図１】 空気入りタイヤの横断面図。FIG. 1 is a cross-sectional view of a pneumatic tire.
【図２】 夫々直径の異なる独立リングの不等ピッチ積
層体であるスチールフィラー。FIG. 2 is a steel filler which is an irregular pitch laminate of independent rings having different diameters.
【図３】 図２における二点鎖線部の拡大図。FIG. 3 is an enlarged view of a two-dot chain line portion in FIG. 2;
【図４】 不等ピッチ渦巻き状に巻回積層されたスチー
ルフィラー。FIG. 4 is a steel filler wound and laminated in an irregular pitch spiral shape.
【図５】 図４における二点鎖線部の拡大図。FIG. 5 is an enlarged view of a two-dot chain line part in FIG. 4;
【図６】 空気圧異常低下時のタイヤの接地側の横断面
図。FIG. 6 is a cross-sectional view of the tire on the ground contact side when the air pressure is abnormally decreased.
１…空気入りタイヤ、２…カーカス層、３…ビード部、
４…ビードコア、５…エイペックス、６…スチールフィ
ラー、１０ｓ…直線状のゴム被覆スチールコード、１０
ｗ…波状ウェーブを施したゴム被覆スチールコード。1 ... pneumatic tire, 2 ... carcass layer, 3 ... bead part,
4: Bead core, 5: Apex, 6: Steel filler, 10s: Straight rubber-coated steel cord, 10
w: rubber-coated steel cord with wavy waves.
Claims (3)
質ゴム製のエイペックスが貼着されており、かつ、この
エイペックスの側部に、ゴム被覆金属コードがビードコ
アとほぼ平行に周方向に巻回積層された複数のスチール
フィラーが設けられているタイヤのビード部の補強構造
において、スチールフィラーが巻回方向にスチールコー
ドの切断箇所を許容しながら、かつ、積層方向に間隔を
保ちながら巻回積層されていることを特徴とするタイヤ
のビード部の補強構造。An apex made of hard rubber having a triangular cross section is attached to an outer peripheral side of a bead core, and a rubber-coated metal cord is attached to a side portion of the apex in a circumferential direction substantially parallel to the bead core. In a reinforcing structure for a bead portion of a tire provided with a plurality of rolled steel fillers, the steel filler allows a cut portion of the steel cord in the winding direction and winds while maintaining an interval in the stacking direction. A reinforcement structure for a bead portion of a tire, which is laminated one after another.
る独立リングの積層体である請求項１に記載の補強構
造。2. The reinforcing structure according to claim 1, wherein the steel filler is a laminate of independent rings having different diameters.
の積層体である請求項１に記載の補強構造。3. The reinforcing structure according to claim 1, wherein each of the steel fillers is a spirally-shaped laminate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11190770A JP2001018620A (en) | 1999-07-05 | 1999-07-05 | Reinforcing structure for tire bead part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11190770A JP2001018620A (en) | 1999-07-05 | 1999-07-05 | Reinforcing structure for tire bead part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001018620A true JP2001018620A (en) | 2001-01-23 |
Family
ID=16263445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11190770A Pending JP2001018620A (en) | 1999-07-05 | 1999-07-05 | Reinforcing structure for tire bead part |
Country Status (1)
| Country | Link |
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| JP (1) | JP2001018620A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002019430A (en) * | 2000-07-05 | 2002-01-23 | Bridgestone Corp | Pneumatic tire |
| JP2005529018A (en) * | 2002-06-10 | 2005-09-29 | ソシエテ ドゥ テクノロジー ミシュラン | Tire bead reinforcement with discontinuous reinforcement elements |
| JP2006506266A (en) * | 2002-11-18 | 2006-02-23 | ソシエテ ド テクノロジー ミシュラン | Extended running tire with corrugated side walls |
| US7133337B2 (en) | 2002-08-27 | 2006-11-07 | Nec Corporation | Method for recording data on an optical disk by using a running optimum power control technique |
| JP2007050843A (en) * | 2005-08-19 | 2007-03-01 | Yokohama Rubber Co Ltd:The | Pneumatic tire and its manufacturing method |
| WO2007082595A1 (en) * | 2006-01-21 | 2007-07-26 | Continental Aktiengesellschaft | Vehicle pneumatic tyre with a bead reinforcement means |
| JP2008285588A (en) * | 2007-05-17 | 2008-11-27 | Sumitomo Rubber Ind Ltd | Rubber composition for bead apex, and pneumatic tire |
-
1999
- 1999-07-05 JP JP11190770A patent/JP2001018620A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002019430A (en) * | 2000-07-05 | 2002-01-23 | Bridgestone Corp | Pneumatic tire |
| US6776207B2 (en) * | 2000-07-05 | 2004-08-17 | Bridgestone Corporation | Pneumatic tire with bead reinforcing layer adjacent bead filler |
| JP2005529018A (en) * | 2002-06-10 | 2005-09-29 | ソシエテ ドゥ テクノロジー ミシュラン | Tire bead reinforcement with discontinuous reinforcement elements |
| US7133337B2 (en) | 2002-08-27 | 2006-11-07 | Nec Corporation | Method for recording data on an optical disk by using a running optimum power control technique |
| JP2006506266A (en) * | 2002-11-18 | 2006-02-23 | ソシエテ ド テクノロジー ミシュラン | Extended running tire with corrugated side walls |
| JP2007050843A (en) * | 2005-08-19 | 2007-03-01 | Yokohama Rubber Co Ltd:The | Pneumatic tire and its manufacturing method |
| WO2007082595A1 (en) * | 2006-01-21 | 2007-07-26 | Continental Aktiengesellschaft | Vehicle pneumatic tyre with a bead reinforcement means |
| JP2008285588A (en) * | 2007-05-17 | 2008-11-27 | Sumitomo Rubber Ind Ltd | Rubber composition for bead apex, and pneumatic tire |
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