JP3843182B2 - Pneumatic tire - Google Patents

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Publication number
JP3843182B2
JP3843182B2 JP16971598A JP16971598A JP3843182B2 JP 3843182 B2 JP3843182 B2 JP 3843182B2 JP 16971598 A JP16971598 A JP 16971598A JP 16971598 A JP16971598 A JP 16971598A JP 3843182 B2 JP3843182 B2 JP 3843182B2
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Prior art keywords
tire
bead
rubber layer
layer
carcass layer
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JP2000001109A (en
Inventor
淳 荒川
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Priority to JP16971598A priority Critical patent/JP3843182B2/en
Priority to US09/330,219 priority patent/US6286576B1/en
Publication of JP2000001109A publication Critical patent/JP2000001109A/en
Priority to US09/874,046 priority patent/US6513559B2/en
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Description

【０００１】
【発明の属する技術分野】
本発明は、高速走行時の旋回性能を向上させた空気入りタイヤに関し、特にレース用として好適な空気入りタイヤに関する。
【０００２】
【従来の技術】
近年、車両の高性能化に伴い高速走行時のタイヤの旋回性能の一層の向上が要望されている。すなわち、車両が高速走行しながら旋回するときには旋回外側のタイヤに過大な横力が作用し、車両外側のサイド部とビード部がタイヤ内側に倒れ込み、これによって旋回性能が制限されてしまう。
【０００３】
従来、上記のような旋回時のビード部の倒れ込みを防止して高速走行時の旋回性能を高めるために、１本巻きスチールビードコアを使用すると共にビードトウ部にＪＩＳ−Ａ硬度８０°〜９８°のゴムストックを配置し、このゴムストックの外表面に有機繊維コードのチェーファーを配したビード部構造が提案されている（特開平6-227216号公報) 。
【０００４】
しかしながら、このビード部構造では、最近における一層の高速化に要望されている、例えば半径１００ｍのコーナーを２００ｋｍ／ｈの速度で走行する場合においての操縦安定性能の確保は不可能になっている。
【０００５】
【発明が解決しようとする課題】
本発明の目的は、半径１００ｍのコーナーを２００ｋｍ／ｈ以上の高速で旋回走行するような高速旋回性能の確保を可能にした空気入りタイヤを提供することにある。
【０００６】
【課題を解決するための手段】
本発明は、左右一対のビード部のビードコアにカーカス層が装架され、トレッド部においてカーカス層の外側にベルト層がタイヤ１周に亘って配置された空気入りタイヤにおいて、前記ビード部におけるビードトウ部からタイヤ内壁面に沿う領域に、前記ビードコアにタイヤ内側から外側へ折り返したカーカス層の内側面に接するように、ＪＩＳ−Ａ硬度９０°〜９９°の補強ゴム層を配設すると共に、該補強ゴム層の外側をタイヤ内壁面からビードシートにかけて強度０．２５ＫＮ／コード以上、弾性率２０ＫＮ／ｍｍ2以上、太さ７２０ｄ／２以上の芳香族ポリアミド繊維コードを、タイヤ周方向に対し２０°〜９０°で、かつエンド数２９本／５０ｍｍ以上に配列したチェーファーで被覆し、さらに、前記補強ゴム層のビードコア内側面からビードトウ部先端までのタイヤ軸方向幅Ｌ2がビードコアのタイヤ軸方向最大幅Ｌ1に対する比Ｌ2／Ｌ1、ビードトウ部先端部のタイヤ内壁面側チェーファーとビードシート側チェーファーとのなす角度θ、前記補強ゴム層のリム径相当位置からの高さＨの前記最大幅Ｌ1に対する比Ｈ／Ｌ1を、それぞれ下記の関係にしたことを特徴とする。
【０００７】
０．５≦Ｌ2／Ｌ1≦１．０
６０°≦θ≦８０°
１．５≦Ｈ／Ｌ1
このように補強ゴム層を配設すると共にその補強ゴム層をチェーファーで被覆し、さらに、比Ｌ2／Ｌ1、角度θ、比Ｈ／Ｌ1を定めたため、半径１００ｍのコーナーを２００ｋｍ／ｈ以上の高速で旋回走行しても、ビードトウ部が高い圧縮強度を発揮してタイヤサイド部の大変形を抑制するので、旋回性能を向上させることが可能となる。
【０００８】
【発明の実施の形態】
図１にレース用タイヤとして本発明の空気入りタイヤを構成するビード部について、その片側の子午線方向断面を例示する。図１に示すようなビード部１は左右両側に対をなして設けられ、そこに埋設されたビードコア２に２枚のカーカス層３1 、３2 が装架されている。最内カーカス層３1 は、その端部がビードコア２の廻りにタイヤ内側から外側に折り返されて巻き上げられ、カーカス層３1 の端部はビードフィラー８のほぼ中間部に位置する。一方、最外カーカス層３2 はカーカス層３1 の巻き上げ部に沿ってその巻き上げ部の外側に配置され、ビードトウ部４の先端に至っている。トレッド部においてはこれらカーカス層３1 、３2 、の外側に、複数枚のベルト層がタイヤ１周に亘って配置されている（図示せず）。７1 、７2 は、ナイロン繊維コード、ポリエステル繊維コードなどの一般の有機繊維コードからなる補強層である。
【０００９】
ビードトウ部４からタイヤ内壁面に沿う領域には、ＪＩＳ−Ａ硬度９０°〜９９°の補強ゴム層が配設されている。ＪＩＳ−Ａ硬度９０°未満ではビードトウ部４が柔らか過ぎて高速旋回性能の向上をはかることができなくなり、一方、ＪＩＳ−Ａ硬度９９°超ではビード部剛性が高くなり過ぎてリム組みが困難になると共にビードトウ欠け、ビード部のリムへの座りの悪化などが生じてしまう。
【００１０】
補強ゴム層６の外側（補強ゴム層６のタイヤ軸方向内側面およびラジアル方向内側面）は、タイヤ内壁面１０からビードシート１１にかけて強度０．２５ＫＮ／コード以上、弾性率２０ＫＮ／ｍｍ2以上の芳香族ポリアミド繊維コードからなるチェーファー１３で被覆している。
チェーファー１３を構成する芳香族ポリアミド繊維コードは、強度０．２５ＫＮ／コード以上、弾性率２０ＫＮ／ｍｍ2以上の高強度、高弾性率を有している。また、このような芳香族ポリアミド繊維コードは、太さ７２０ｄ／２以上、好ましくは太さ１０００ｄ／２〜１５００ｄ／２であって、チェーファーを構成する際のコード打ち込み本数（エンド数）が２９本／５０ｍｍ以上、好ましくは４０本〜６０本／５０ｍｍである。さらに、チェーファーにおいては、芳香族ポリアミド繊維コードがタイヤ周方向に対し２０°〜９０°で傾斜している。
【００１１】
補強ゴム層６の大きさとしては、補強ゴム層６のビードコア内側面からビードトウ部先端までのタイヤ軸方向幅Ｌ2 が、ビードコア２のタイヤ軸方向最大幅Ｌ1 に対する比Ｌ2 ／Ｌ1 、ビードトウ部先端部のタイヤ内壁面１０側チェーファーとビードシート１１側チェーファーとのなす角度θ、補強ゴム層６のリム径相当位置からの高さＨの前記最大幅Ｌ1 に対する比Ｈ／Ｌ1 が、それぞれ下記の関係にある。
【００１２】
０．５≦Ｌ2／Ｌ1≦１．０
６０°≦θ≦８０°
１．５≦Ｈ／Ｌ1
Ｌ2／Ｌ1が０．５未満では補強ゴム層（ビードトウ部）の幅が狭すぎて実質的に旋回性能の向上をはかることができなくなり、一方、Ｌ2／Ｌ1が１．０を超えると補強ゴム層（ビードトウ部）の幅が大きくなりすぎてビード部とリムとの嵌合性が悪化してしまう。また、角度θが６０°未満では補強ゴム層６の容量が減少するので補強ゴム層６の圧縮強度が小さくなって旋回性能が悪くなる。θが８０°を超えると補強ゴム層６の容量が大きくなるので旋回性能の向上は望めない。したがって、角度θは６０°〜８０°である。Ｈ／Ｌ1が１．５未満では、補強ゴム層６の容量が減少して補強ゴム層６の圧縮強度が小さくなる。また、２．０を超えると圧縮強度がほぼ飽和する。したがって、Ｈ／Ｌ1は、１．５〜２．０の範囲にするとよい。
【００１３】
【実施例】
▲１▼ タイヤサイズ 340/40 ZR13を同じくする下記の本発明タイヤ１および従来タイヤ１を作製し、これらのタイヤにつき、高速走行時の旋回性能を評価した。この結果を表１に示す。
【００１４】
本発明タイヤ１
図１に示すビード部構造を有する。ビードコア２は１本巻きスチールビードコア。補強ゴム層６は下記内容のゴム組成物からなる。
補強ゴム層６の硬さは、ＪＩＳ−Ａ硬度９１°である。チェーファー１３は太さ１０００ｄ／２のアラミド繊維コード（芳香族ポリアミド繊維コード）からなる。エンド数４１本／５０ｍｍ。アラミド繊維コードのタイヤ周方向に対する傾斜角度４５°。
Ｌ2 ／Ｌ1 ＝０．５。角度θ＝６０°。Ｈ／Ｌ1 ＝１．５。
【００１５】
従来タイヤ１
チェーファー１３を太さ８４０ｄ／２の６６ナイロン繊維コードで構成すると共に、Ｌ2 ／Ｌ1 ＝２．０、角度θ＝６０°、Ｈ／Ｌ1 ＝３．０であることを除いて本発明タイヤ１に同じ。
高速走行時の旋回性能：
旋回性能試験は、一周が４．４ｋｍの半径１００ｍのコーナーを有する試験コースで車両を走行させた際のラップタイムと、半径１００ｍのコーナーの通過速度によって評価した。評価車両は３リットルの競技専用車である。この結果を従来タイヤ１を１００とする指数で示す。指数値の大きい方が旋回性能に優れている。
【００１６】
【表１】

Figure 0003843182
【００１７】
表１から明らかなように、本発明タイヤ１は従来タイヤ１に比して旋回性能に優れていることが判る。
【００１８】
▲２▼ 上記の本発明タイヤ１につき、θ＝６０°、Ｈ／Ｌ1 ＝１．５に設定すると共に、Ｌ2 ／Ｌ1 を０．２５、０．５、０．７５、１．０と変化させて、高速走行時の旋回性能を同様に評価した。この結果を図２に示す。図２では、上記の従来タイヤ１を１００とする。
図２から判るように、Ｌ2 ／Ｌ1 ＝０．５〜１．０の範囲で旋回性能が高い。
【００１９】
▲３▼ 上記の本発明タイヤ１につき、Ｌ2 ／Ｌ1 ＝０．５、Ｈ／Ｌ1 ＝１．５に設定すると共に、θを５０°、６０°、７０°、８０°、９０°と変化させて、高速走行時の旋回性能を同様に評価した。この結果を図３に示す。図３では、上記の従来タイヤ１を１００とする。
図３から判るように、θ＝６０°〜８０°の範囲で旋回性能が高い。
【００２０】
（４）上記の本発明タイヤ１につき、Ｌ2／Ｌ1＝０．５、θ＝６０°に設定すると共に、Ｈ／Ｌ1を０．５、１．０、１．５、２．０、と変化させて、高速走行時の旋回性能を同様に評価した。この結果を図４に示す。図４では、上記の従来タイヤ１を１００とする。
図４から判るように、１．５≦Ｈ／Ｌ1の範囲で旋回性能が高い。
【００２１】
【発明の効果】
以上説明したように本発明によれば、ビード部におけるビードトウ部からタイヤ内壁面に沿う領域に、ビードコアにタイヤ内側から外側へ折り返したカーカス層の内側面に接するように、ＪＩＳ−Ａ硬度９０°〜９９°の補強ゴム層を配設すると共にその補強ゴム層を高強度、高弾性率の芳香族ポリアミド繊維コードからなるチェーファーで被覆し、さらに、比Ｌ2／Ｌ1、角度θ、比Ｈ／Ｌ1を定めたために、半径１００ｍのコーナーを２００ｋｍ／ｈ以上の高速で旋回走行するような高速旋回性能の確保を可能にすることができる。
【図面の簡単な説明】
【図１】本発明の空気入りタイヤのビード部の一例の子午線方向断面図である。
【図２】幅Ｌ2 ／Ｌ1 と高速走行時の旋回性能との関係図である。
【図３】角度θと高速走行時の旋回性能との関係図である。
【図４】高さＨ／Ｌ1 と高速走行時の旋回性能との関係図である。
【符号の説明】
１ ビード部 ２ ビードコア ３1 、３2 カーカス層
４ ビードトウ部 ６ 補強ゴム層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic tire with improved turning performance during high-speed traveling, and more particularly to a pneumatic tire suitable for racing.
[0002]
[Prior art]
In recent years, there has been a demand for further improvement in the turning performance of tires during high-speed traveling as the performance of vehicles increases. That is, when the vehicle turns at a high speed, an excessive lateral force acts on the tire on the outer side of the turn, and the side portion and the bead portion on the outer side of the vehicle fall down on the inner side of the tire, thereby limiting the turning performance.
[0003]
Conventionally, in order to prevent the bead part from collapsing during turning and to improve the turning performance during high speed running, a single-roll steel bead core is used and the bead toe part has a JIS-A hardness of 80 ° to 98 °. A bead portion structure in which a rubber stock is arranged and an organic fiber cord chafer is arranged on the outer surface of the rubber stock has been proposed (Japanese Patent Laid-Open No. 6272/216).
[0004]
However, in this bead portion structure, it is impossible to ensure the steering stability performance when traveling at a speed of 200 km / h, for example, in a corner having a radius of 100 m, which is required for further higher speed recently.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a pneumatic tire capable of ensuring high-speed turning performance such as turning at a high speed of 200 km / h or more in a corner having a radius of 100 m.
[0006]
[Means for Solving the Problems]
The present invention relates to a pneumatic tire in which a carcass layer is mounted on a bead core of a pair of left and right bead portions, and a belt layer is disposed around the circumference of the tire in the tread portion, and the bead toe portion in the bead portion. the region along the inner wall tires, in contact with the inner surface of the carcass layer folded back from the tire inside to the outside to the bead core, as well as provided with reinforcing rubber layer of JIS-a hardness of 90 ° to 99 °, reinforcing An aromatic polyamide fiber cord having a strength of 0.25 KN / cord or more, an elastic modulus of 20 KN / mm 2 or more , and a thickness of 720 d / 2 or more from the tire inner wall surface to the bead sheet on the outer side of the rubber layer is 20 ° to the tire circumferential direction. in 90 °, and coated with a chafer arranged end number 29 present / 50 mm or more, further, the bead core in the side surface of the reinforcing rubber layer The ratio tire axial direction width L 2 to Luo bead toe tip is with respect to the tire axial maximum width L 1 of the bead core L 2 / L 1, formed by the tire inner wall surface side chafer bead toe tip portion and the bead seat side chafer The ratio H / L 1 of the angle θ and the height H from the position corresponding to the rim diameter of the reinforcing rubber layer to the maximum width L 1 is set as follows.
[0007]
0.5 ≦ L 2 / L 1 ≦ 1.0
60 ° ≦ θ ≦ 80 °
1.5 ≦ H / L 1
Since the reinforcing rubber layer is disposed in this way and the reinforcing rubber layer is covered with a chafer, and the ratio L 2 / L 1 , the angle θ, and the ratio H / L 1 are determined, a corner with a radius of 100 m is set to 200 km. Even when turning at a high speed of / h or more, the bead toe portion exhibits high compressive strength and suppresses large deformation of the tire side portion, so that turning performance can be improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 illustrates a meridional cross section on one side of a bead portion constituting the pneumatic tire of the present invention as a racing tire. A bead portion 1 as shown in FIG. 1 is provided in pairs on the left and right sides, and two carcass layers 3 1 and 3 2 are mounted on a bead core 2 embedded therein. Innermost carcass layer 3 1, its end is rolled up is folded outward from inside of the tire around the bead core 2, the ends of the carcass layer 3 1 is positioned substantially intermediate portion of the bead filler 8. On the other hand, the outermost carcass layer 3 2 is disposed on the outside of the turned-up portion along the winding portion of the carcass layer 3 1, has led to the tip of the bead toe portion 4. In the tread portion, a plurality of belt layers are disposed over the circumference of the tire (not shown) outside these carcass layers 3 1 , 3 2 . Reference numerals 7 1 and 7 2 denote reinforcing layers made of general organic fiber cords such as nylon fiber cords and polyester fiber cords.
[0009]
A reinforcing rubber layer having a JIS-A hardness of 90 ° to 99 ° is disposed in a region along the tire inner wall surface from the bead toe portion 4. If the JIS-A hardness is less than 90 °, the bead toe portion 4 is too soft to improve the high-speed turning performance. On the other hand, if the JIS-A hardness exceeds 99 °, the bead portion rigidity becomes too high and the rim assembly becomes difficult. At the same time, the lack of bead toe and the deterioration of the sitting of the bead portion on the rim may occur.
[0010]
The outer side of the reinforcing rubber layer 6 (the inner side surface in the tire axial direction and the inner side surface in the radial direction of the reinforcing rubber layer 6) has a strength of 0.25 KN / cord and a modulus of elasticity of 20 KN / mm 2 or more from the tire inner wall surface 10 to the bead sheet 11. It is covered with a chafer 13 made of an aromatic polyamide fiber cord.
The aromatic polyamide fiber cord constituting the chafer 13 has a strength of not less than 0.25 KN / cord and a high strength of not less than 20 KN / mm 2 and a high modulus of elasticity . Further, such an aromatic polyamide fiber cord has a thickness of 720 d / 2 or more, preferably 1000 d / 2 to 1500 d / 2, and the number of cords to be inserted (the number of ends) when forming a chafer is 29. The number is 50/50 mm or more, preferably 40 to 60/50 mm . Further, in the chafer, the aromatic polyamide fiber cord is inclined at 20 ° to 90 ° with respect to the tire circumferential direction .
[0011]
The size of the reinforcing rubber layer 6 is such that the tire axial width L 2 from the inner side surface of the bead core of the reinforcing rubber layer 6 to the tip of the bead toe portion is a ratio L 2 / L 1 with respect to the maximum axial width L 1 of the bead core 2. The ratio H / L of the angle θ between the tire inner wall surface 10-side chafer and the bead seat 11-side chafer at the tip of the bead toe, and the height H from the position corresponding to the rim diameter of the reinforcing rubber layer 6 to the maximum width L 1 1 has the following relationship.
[0012]
0.5 ≦ L 2 / L 1 ≦ 1.0
60 ° ≦ θ ≦ 80 °
1.5 ≦ H / L 1
If L 2 / L 1 is less than 0.5, the width of the reinforcing rubber layer (bead toe part) is too narrow to substantially improve the turning performance, while L 2 / L 1 is 1.0. If it exceeds, the width of the reinforcing rubber layer (bead toe portion) becomes too large, and the fit between the bead portion and the rim is deteriorated. Further, when the angle θ is less than 60 °, the capacity of the reinforcing rubber layer 6 is reduced, so that the compressive strength of the reinforcing rubber layer 6 is reduced and the turning performance is deteriorated. When θ exceeds 80 °, the capacity of the reinforced rubber layer 6 increases, so that improvement in turning performance cannot be expected. Therefore, the angle θ is 60 ° to 80 ° . When H / L 1 is less than 1.5 , the capacity of the reinforcing rubber layer 6 is reduced and the compressive strength of the reinforcing rubber layer 6 is reduced. On the other hand, if it exceeds 2.0, the compressive strength is almost saturated. Therefore, H / L 1 is preferably in the range of 1.5 to 2.0.
[0013]
【Example】
{Circle around (1)} Tire Size 340/40 The tire 1 of the present invention and the conventional tire 1 having the same ZR13 were produced, and the turning performance during high-speed running was evaluated for these tires. The results are shown in Table 1.
[0014]
Invention tire 1
It has the bead part structure shown in FIG. Bead core 2 is a single-roll steel bead core. The reinforcing rubber layer 6 is made of a rubber composition having the following contents.
The reinforced rubber layer 6 has a JIS-A hardness of 91 °. The chafer 13 is made of an aramid fiber cord (aromatic polyamide fiber cord) having a thickness of 1000 d / 2. Number of ends 41 / 50mm. The inclination angle of the aramid fiber cord with respect to the tire circumferential direction is 45 °.
L 2 / L 1 = 0.5. Angle θ = 60 °. H / L 1 = 1.5.
[0015]
Conventional tire 1
The chafer 13 is composed of 66 nylon fiber cords with a thickness of 840d / 2, except that L 2 / L 1 = 2.0, angle θ = 60 °, and H / L 1 = 3.0. Same as invention tire 1.
Turning performance at high speed :
The turning performance test was evaluated based on the lap time when the vehicle was driven on a test course having a corner with a radius of 100 m and a radius of 4.4 km and the passing speed of a corner with a radius of 100 m. The evaluation vehicle is a 3 liter competition car. This result is shown as an index with the conventional tire 1 as 100. The larger the index value, the better the turning performance.
[0016]
[Table 1]
Figure 0003843182
[0017]
As can be seen from Table 1, the tire 1 of the present invention is superior in turning performance as compared with the conventional tire 1.
[0018]
(2) For the tire 1 of the present invention, θ = 60 ° and H / L 1 = 1.5, and L 2 / L 1 is 0.25, 0.5, 0.75, 1.0 The turning performance during high-speed driving was similarly evaluated. The result is shown in FIG. In FIG. 2, the conventional tire 1 is set to 100.
As can be seen from FIG. 2, the turning performance is high in the range of L 2 / L 1 = 0.5 to 1.0.
[0019]
(3) For the tire 1 of the present invention, L 2 / L 1 = 0.5 and H / L 1 = 1.5, and θ is 50 °, 60 °, 70 °, 80 °, 90 ° The turning performance during high-speed driving was similarly evaluated. The result is shown in FIG. In FIG. 3, the conventional tire 1 is set to 100.
As can be seen from FIG. 3, the turning performance is high in the range of θ = 60 ° to 80 °.
[0020]
(4) For the tire 1 of the present invention, L 2 / L 1 = 0.5, θ = 60 °, and H / L 1 is set to 0.5, 1.0, 1.5, 2.0. The turning performance during high-speed driving was similarly evaluated. The result is shown in FIG. In FIG. 4, the conventional tire 1 is 100.
As can be seen from FIG. 4, the turning performance is high in the range of 1.5 ≦ H / L 1 .
[0021]
【The invention's effect】
As described above, according to the present invention , a JIS-A hardness of 90 ° is in contact with the inner side surface of the carcass layer that is folded back from the inside of the tire to the outside of the bead core in the region along the inner wall surface of the bead from the bead toe portion. A reinforcing rubber layer of ˜99 ° is disposed and the reinforcing rubber layer is covered with a chafer made of an aromatic polyamide fiber cord having a high strength and a high elastic modulus, and the ratio L 2 / L 1 , angle θ, ratio Since H / L 1 is determined , it is possible to ensure high-speed turning performance such as turning at a high speed of 200 km / h or more in a corner having a radius of 100 m.
[Brief description of the drawings]
FIG. 1 is a meridional direction sectional view of an example of a bead portion of a pneumatic tire according to the present invention.
FIG. 2 is a relationship diagram between width L 2 / L 1 and turning performance at high speed running.
FIG. 3 is a relationship diagram between an angle θ and turning performance during high speed running.
FIG. 4 is a diagram showing the relationship between height H / L 1 and turning performance during high-speed running.
[Explanation of symbols]
1 Bead part 2 Bead core 3 1 , 3 2 Carcass layer 4 Bead toe part 6 Reinforced rubber layer

Claims (2)

左右一対のビード部のビードコアにカーカス層が装架され、トレッド部においてカーカス層の外側にベルト層がタイヤ１周に亘って配置された空気入りタイヤにおいて、前記ビード部におけるビードトウ部からタイヤ内壁面に沿う領域に、前記ビードコアにタイヤ内側から外側へ折り返したカーカス層の内側面に接するように、ＪＩＳ−Ａ硬度９０°〜９９°の補強ゴム層を配設すると共に、該補強ゴム層の外側をタイヤ内壁面からビードシートにかけて強度０．２５ＫＮ／コード以上、弾性率２０ＫＮ／ｍｍ2以上、太さ７２０ｄ／２以上の芳香族ポリアミド繊維コードを、タイヤ周方向に対し２０°〜９０°で、かつエンド数２９本／５０ｍｍ以上に配列したチェーファーで被覆し、さらに、前記補強ゴム層のビードコア内側面からビードトウ部先端までのタイヤ軸方向幅Ｌ2がビードコアのタイヤ軸方向最大幅Ｌ1に対する比Ｌ2／Ｌ1、ビードトウ部先端部のタイヤ内壁面側チェーファーとビードシート側チェーファーとのなす角度θ、前記補強ゴム層のリム径相当位置からの高さＨの前記最大幅Ｌ1に対する比Ｈ／Ｌ1を、それぞれ下記の関係にした空気入りタイヤ。
０．５≦Ｌ2／Ｌ1≦１．０
６０°≦θ≦８０°
１．５≦Ｈ／Ｌ1 In a pneumatic tire in which a carcass layer is mounted on a bead core of a pair of left and right bead portions, and a belt layer is disposed over the circumference of the tire in the tread portion on the outside of the carcass layer, the inner wall surface of the tire from the bead toe portion in the bead portion the region along the, in contact with the inner surface of the carcass layer folded back from the tire inside to the outside to the bead core, as well as provided with reinforcing rubber layer of JIS-a hardness of 90 ° to 99 °, the outer reinforcing rubber layer From an inner wall surface of a tire to a bead sheet, an aromatic polyamide fiber cord having a strength of 0.25 KN / cord or more, an elastic modulus of 20 KN / mm 2 or more , and a thickness of 720 d / 2 or more at 20 ° to 90 ° with respect to the tire circumferential direction, and coated with a chafer arranged end number 29 present / 50 mm or more, further, the bead from the bead core in the side surface of the reinforcing rubber layer C section ratio L 2 / L 1 tire axial direction width L 2 is with respect to the tire axial maximum width L 1 of the bead core to the tip, the angle between the tire inner wall surface side chafer bead toe tip portion and the bead seat side chafer A pneumatic tire in which the ratio H / L 1 of the height H from the position corresponding to the rim diameter of the reinforced rubber layer to the maximum width L 1 is as follows.
0.5 ≦ L 2 / L 1 ≦ 1.0
60 ° ≦ θ ≦ 80 °
1.5 ≦ H / L 1 前記カーカス層が、内外２枚のカーカス層からなり、内側のカーカス層が、ビードコアの廻りにタイヤ内側から外側に折り返されて巻き上げられ、外側のカーカス層が、前記内側のカーカス層の巻き上げ部に沿って外側に配置され、ビードトウ部の先端に至っている請求項１記載の空気入りタイヤ。 The carcass layer is composed of two inner and outer carcass layers, the inner carcass layer is folded from the tire inner side to the outer side around the bead core, and the outer carcass layer is wound on the winding portion of the inner carcass layer. The pneumatic tire according to claim 1, wherein the pneumatic tire is arranged on the outer side along the end of the bead toe portion .
JP16971598A 1998-06-17 1998-06-17 Pneumatic tire Expired - Fee Related JP3843182B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP16971598A JP3843182B2 (en) 1998-06-17 1998-06-17 Pneumatic tire
US09/330,219 US6286576B1 (en) 1998-06-17 1999-06-11 Pneumatic tire with specified bead toe
US09/874,046 US6513559B2 (en) 1998-06-17 2001-06-06 Pneumatic tire with specified bead toe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16971598A JP3843182B2 (en) 1998-06-17 1998-06-17 Pneumatic tire

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JP3843182B2 true JP3843182B2 (en) 2006-11-08

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US9024719B1 (en) 2001-07-10 2015-05-05 Xatra Fund Mx, Llc RF transaction system and method for storing user personal data
US8960535B2 (en) 2001-07-10 2015-02-24 Iii Holdings 1, Llc Method and system for resource management and evaluation
US7119659B2 (en) 2001-07-10 2006-10-10 American Express Travel Related Services Company, Inc. Systems and methods for providing a RF transaction device for use in a private label transaction
JP6325909B2 (en) * 2014-06-13 2018-05-16 株式会社ブリヂストン tire
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