JPH1086616A - High performance flat pneumatic radial tire - Google Patents
High performance flat pneumatic radial tireInfo
- Publication number
- JPH1086616A JPH1086616A JP9135474A JP13547497A JPH1086616A JP H1086616 A JPH1086616 A JP H1086616A JP 9135474 A JP9135474 A JP 9135474A JP 13547497 A JP13547497 A JP 13547497A JP H1086616 A JPH1086616 A JP H1086616A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- belt
- cord
- rubber
- pneumatic radial
- 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.)
- Granted
Links
- 239000011324 bead Substances 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229910010272 inorganic material Inorganic materials 0.000 claims description 2
- 239000011147 inorganic material Substances 0.000 claims description 2
- 239000011368 organic material Substances 0.000 claims description 2
- 239000004760 aramid Substances 0.000 claims 1
- 229920003235 aromatic polyamide Polymers 0.000 claims 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000010073 coating (rubber) Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、高性能空気入り
ラジアルタイヤに関し、特に高性能スポーツカータイプ
に好適な偏平率６０％以下の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 high-performance pneumatic radial tire, and more particularly to a pneumatic radial tire suitable for a high-performance sports car type and having an aspect ratio of 60% or less.
【０００２】ここで、本明細書で使用する用語を説明す
ると、「Ｍ100 」とは、ＪＩＳ−Ｋ６３０１に示される
ゴムの試験法によるゴムの物性値であり、ゴムを室温下
で１００％伸長させたときの引張り応力である。ゴムの
物性を表わす一般的なもののひとつであり、１００％モ
ジュラスと称される。「適用リム」、「規定の空気
圧」、「規定の質量」、「規定の質量に対応する負荷」
の各用語は、1996年度JATMA YEAR BOOK に掲載されてい
る用語の意味と同一で用いる。1996年度JATMA YEAR BOO
K にないものは、同1996年度JATMA YEAR BOOK の規格に
準じ、タイヤを使用／適用可能なリムに装着し、タイヤ
の性能を有効に発揮させるために適した空気圧、質量を
負荷した状態である。Here, the terms used in the present specification are explained. "M100" is a physical property value of a rubber according to a rubber test method specified in JIS-K6301. It is the tensile stress when it is applied. It is one of the general ones showing the physical properties of rubber and is called 100% modulus. "Applicable rim", "Specified air pressure", "Specified mass", "Load corresponding to specified mass"
The terms used in the above are the same as those in the 1996 JATMA YEAR BOOK. 1996 JATMA YEAR BOO
Those not in K are in accordance with the 1996 JATMA YEAR BOOK standard, with tires mounted on applicable / applicable rims and loaded with air pressure and mass suitable for effective use of tire performance. .
【０００３】[0003]
【従来の技術】高性能空気入りラジアルタイヤ、とりわ
け高性能スポーツカータイプの偏平ラジアルタイヤは、
車両の高出力化に伴い、高速旋回時等にタイヤに加えら
れる大きい横力に高い横剛性を必要とし、また、高速走
行時の制動・駆動性能にも優れていることを必要とす
る。そのため、タイヤの偏平率を小さくし、路面グリッ
プ力を重要視して強固な横剛性に見合うようにトレッド
ゴムの硬度を小さくし、さらにはビード部からサイド部
にかけてスチールコードなどを用いたゴム被覆コードか
ら成るビード補強層を配置するなどの手段を採用してき
た。2. Description of the Related Art High performance pneumatic radial tires, especially flat tires of the high performance sports car type,
With the increase in the output of the vehicle, a large lateral force applied to the tires at the time of high-speed turning or the like requires high lateral rigidity, and also requires excellent braking / driving performance at high-speed running. For this reason, the tire flatness is reduced, the tread rubber hardness is reduced to match the strong lateral rigidity with emphasis on the road surface grip force, and rubber coating using steel cord etc. from the bead portion to the side portion Means such as disposing a bead reinforcing layer made of cord have been employed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、タイヤ
の偏平化が進み、かつトレッド部のグリップ力が高くな
ると、高速でのコーナーリング時、制動・駆動時、ハン
ドリング時等にサイドウォール部に加わる変形時の応力
は非常に大きくなる。また、ロープロフィール化により
一段と狭くなったフレキシブルゾーンの中で応力集中領
域を避けて前記ビード補強層を効果的に配置するには高
さの設定等に困難を生じる。したがって、ビード補強層
のコード端部への応力集中によるセパレーション故障を
誘発しがちとなり、ビード部耐久性が低下する問題があ
った。However, when the flattening of the tire progresses and the grip force of the tread portion increases, the deformation applied to the sidewall portion at the time of cornering, braking / driving, handling at high speed, etc. Will be very large. Further, it is difficult to set the height and the like in order to effectively dispose the bead reinforcing layer while avoiding the stress concentration region in the flexible zone which is further narrowed by the low profile. Accordingly, separation failure due to stress concentration on the cord end of the bead reinforcing layer tends to be induced, and there is a problem that bead portion durability is reduced.
【０００５】さらに、ゴム被覆コードから成るビード補
強層の場合、コードの長手方向と短手方向とでは補強効
果に著しい差があり、タイヤ径方向剛性とタイヤ周方向
剛性を同時に満足させることは難しかった。例えば、コ
ードの向きをタイヤ径方向に近づけてタイヤ径方向剛性
を高めると、高速旋回性能等の操縦性能は向上するが、
主にタイヤ周方向剛性を必要とする制動・駆動性能は犠
牲になる。逆に、コードの向きをタイヤ周方向に近づけ
ると制動・駆動性能は向上するが、高速旋回性能は低下
する。このように高速旋回性能、制動・駆動性能の両方
を向上させることは困難であった。Further, in the case of a bead reinforcing layer made of a rubber-coated cord, there is a remarkable difference in the reinforcing effect between the longitudinal direction and the lateral direction of the cord, and it is difficult to simultaneously satisfy the rigidity in the tire radial direction and the rigidity in the tire circumferential direction. Was. For example, when the direction of the cord is made closer to the tire radial direction to increase the tire radial rigidity, the steering performance such as high-speed turning performance is improved,
The braking / driving performance that mainly requires tire circumferential rigidity is sacrificed. Conversely, when the direction of the cord is closer to the tire circumferential direction, the braking / driving performance is improved, but the high-speed turning performance is reduced. Thus, it has been difficult to improve both high-speed turning performance and braking / driving performance.
【０００６】また、ビード補強層の場合、コード端部へ
の応力集中によるビード部耐久性低下の問題に対し、コ
ード配設角度等の配慮が必要であり上述の選択方法には
限界があった。さらに、ビード補強層のコードがスチー
ルコードの場合は、重量増加による発進・加速性能の低
下、燃費性能の低下といった面での問題もあった。Further, in the case of the bead reinforcing layer, consideration has to be given to the angle at which the cords are arranged in order to reduce the durability of the bead due to the concentration of stress at the ends of the cords. . Further, when the cord of the bead reinforcing layer is a steel cord, there are also problems in that the starting / acceleration performance is reduced due to an increase in weight, and the fuel consumption performance is reduced.
【０００７】本発明は、上記事情に鑑みてなされたもの
で、ビード部耐久性を向上すると同時に、高速旋回性等
の操縦性能、制動・駆動性能をともに向上することので
きる高性能偏平空気入りラジアルタイヤを提供すること
を目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a high performance flat pneumatic tire capable of improving both the bead durability and the steering performance such as high-speed turning performance and the braking / driving performance. It aims to provide radial tires.
【０００８】[0008]
【発明を解決するための手段】本発明は、トレッド部
と、このトレッド部に連なる一対のサイドウォール部
と、このサイドウォール部に連なる一対のビード部とを
具備し、カーカスコードがタイヤ赤道に対し実質的に直
交する方向に延びる少なくとも一枚のカーカスプライか
ら成るカーカスと、このカーカスと前記トレッド部との
間に配置されかつベルトコードがタイヤ赤道に対し鋭角
で互いに交差する方向に延びる少なくとも二枚のベルト
プライから成るベルトとを有し、偏平率６０％以下の高
性能偏平空気入りラジアルタイヤであって、前記サイド
ウォール部を、タイヤを適用リムに装着し、規定の空気
圧とし、かつ無負荷の状態で、前記ビード部よりタイヤ
断面高さの５０％〜８５％まで延在する高さとし、この
サイドウォール部を形成するサイドウォールゴムは、１
００％伸張時の引張り弾性率（Ｍ100 ）を７０〜１１０
ｋｇｆ／ｃｍ2 とした。SUMMARY OF THE INVENTION The present invention comprises a tread portion, a pair of sidewall portions connected to the tread portion, and a pair of bead portions connected to the sidewall portion. A carcass consisting of at least one carcass ply extending in a direction substantially perpendicular to the carcass; and at least two carcasses arranged between the carcass and the tread portion and extending in a direction intersecting each other at an acute angle to the tire equator. A high-performance flat pneumatic radial tire having a flatness of 60% or less, wherein the sidewall portion is mounted on an applicable rim, the tire is provided with a specified air pressure, and Under a load, the height extends from the bead portion to 50% to 85% of the tire sectional height, and the sidewall portion is formed. Sidewall rubber that is, 1
The tensile modulus (M100) at the time of 00% elongation is 70 to 110.
kgf / cm 2 .
【０００９】前記サイドウォール部の高さが５０％未満
ではサイドウォール部としての補強効果が不足し、８５
％を越える場合にはサイドウォール部とトレッド部との
境界面の位置がタイヤ接地面に近すぎ、コーナーリング
時等に路面に接触しがちとなり、その結果、乗り心地性
能が著しく悪化する。If the height of the side wall portion is less than 50%, the reinforcing effect as the side wall portion is insufficient, and
%, The position of the boundary surface between the sidewall portion and the tread portion is too close to the tire contact surface and tends to come into contact with the road surface at the time of cornering or the like, and as a result, the riding comfort performance is significantly deteriorated.
【００１０】サイドウォール部を形成するサイドウォー
ルゴムのＭ100 の値が７０ｋｇｆ／ｃｍ2 未満ではゴム
が柔らかすぎてサイドウォール部としての補強効果が不
足し、１１０ｋｇｆ／ｃｍ2 を越える場合には非常に硬
すぎてゴム割れ等の新たな問題が生じる。[0010] The value of M100 of side wall rubber forming the sidewall portion is insufficient reinforcing effect as the side wall portion rubber is too soft is less than 70 kgf / cm 2, very when exceeding 110 kgf / cm 2 It is too hard and causes new problems such as rubber cracks.
【００１１】本発明によると、サイドウォール部を形成
するサイドウォールゴムに比較的高弾性率のゴムを使用
することによりビード部の補強効果が向上する。その結
果、ゴム引きコードから成るビード補強層を使用するこ
となくビード部が補強され、ビード部耐久性が向上す
る。また、サイドウォールゴムは、異方性を有しないの
で、タイヤ周方向剛性とタイヤ径方向剛性を同時に満足
させることが可能となり、主にタイヤ周方向剛性を必要
とする制動・駆動性能と主にタイヤ径方向剛性を必要と
する高速旋回時の操縦性能をともに向上可能とする。According to the present invention, the effect of reinforcing the bead portion is improved by using a rubber having a relatively high elastic modulus for the sidewall rubber forming the sidewall portion. As a result, the bead portion is reinforced without using a bead reinforcing layer made of a rubberized cord, and the bead portion durability is improved. In addition, since the sidewall rubber does not have anisotropy, it is possible to satisfy both the tire circumferential rigidity and the tire radial rigidity at the same time. It is possible to improve both the steering performance during high-speed turning that requires tire radial rigidity.
【００１２】前記トレッド部を形成するトレッドゴム
は、ＪＩＳスプリング式Ａ硬度が５０度〜７０度であ
り、かつ、Ｍ100 の値が５〜３０ｋｇｆ／ｃｍ2 であ
り、前記サイドウォールゴムのＭ100 の値は当該トレッ
ドゴムのＭ100 の値よりも大きく、同サイドウォールゴ
ムのＭ100 の値と当該トレッドゴムのＭ100 の値との差
は５０〜１０５ｋｇｆ／ｃｍ2 であることが好ましい。The tread rubber forming the tread portion has a JIS spring-type A hardness of 50 to 70 degrees, an M100 value of 5 to 30 kgf / cm 2 , and an M100 value of the sidewall rubber. Is larger than the M100 value of the tread rubber, and the difference between the M100 value of the sidewall rubber and the M100 value of the tread rubber is preferably 50 to 105 kgf / cm 2 .
【００１３】トレッドゴムのＪＩＳスプリング式Ａ硬度
を５０度以上にすれば、ゴムが柔らかすぎることなくし
たがって耐熱性、磨耗耐久性が向上し、７０度以下にす
れば、路面ホールディング性が向上し必要なグリップ力
が容易に得られる。If the JIS spring type A hardness of the tread rubber is set to 50 degrees or more, the rubber is not too soft, so that the heat resistance and abrasion durability are improved. If the hardness is set to 70 degrees or less, the road surface holding property is improved. A good grip force can be easily obtained.
【００１４】Ｍ100 の値を５ｋｇｆ／ｃｍ2 以上とすれ
ば、ゴムが柔らかすぎることなくしたがって耐熱性、磨
耗耐久性が向上し、３０ｋｇｆ／ｃｍ2 以下であれば、
路面ホールディング性が向上し必要なグリップ力が容易
に得られる。[0014] if the value of M100 5 kgf / cm 2 or more, therefore heat resistance without rubber is too soft, abrasion resistance is improved, if 30 kgf / cm 2 or less,
The road surface holding ability is improved, and the required grip force can be easily obtained.
【００１５】サイドウォールゴムのＭ100 の値を当該ト
レッドゴムのＭ100 の値よりも大きくするのは補強効果
を上げるためであり、サイドウォールゴムのＭ100 の値
とトレッドゴムのＭ100 の値との差を５０ｋｇｆ／ｃｍ
2 以上とすることでサイドウォールとしての補強効果を
より効果的なものとすることができ、１０５ｋｇｆ／ｃ
ｍ2 以下とすることでトレッドゴムとの剛性段差を小さ
くすることができる。The reason why the value of M100 of the sidewall rubber is set to be larger than the value of M100 of the tread rubber is to enhance the reinforcing effect, and the difference between the value of M100 of the sidewall rubber and the value of M100 of the tread rubber is determined. 50kgf / cm
By setting it to 2 or more, the reinforcing effect as a sidewall can be made more effective, and 105 kgf / c
By setting it to m 2 or less, the rigidity difference from the tread rubber can be reduced.
【００１６】前記ベルトの最大幅は、タイヤを適用リム
に装着し、規定の空気圧とし、規定の質量に対応する負
荷を加えた状態でのトレッド接地幅の１００％〜１２５
％の大きさにあるタイヤに対して本発明は特に好適であ
る。そのベルトコードは、コード角度がタイヤ赤道に対
し１５〜３０度であり、かつ、ベルトコードの引張り弾
性率が４０００ｋｇｆ／ｍｍ2 以上であることが望まし
い。The maximum width of the belt is 100% to 125% of the tread contact width when the tire is mounted on the applicable rim, the specified air pressure is applied, and a load corresponding to a specified mass is applied.
The invention is particularly suitable for tires that are in the% range. The belt cord desirably has a cord angle of 15 to 30 degrees with respect to the tire equator, and the tensile modulus of the belt cord is 4000 kgf / mm 2 or more.
【００１７】ベルトコードのコード角度を１５度以上と
することで成型〜加硫工程におけるグリーンケースの変
形に容易に対処することができ、３０度以下とすること
で高速走行時におけるタイヤ周方向へのタガ効果を十分
に発揮させることができ、高速耐久性を十分に満足させ
ることができる。By setting the cord angle of the belt cord to 15 degrees or more, deformation of the green case in the molding to vulcanization process can be easily dealt with, and by setting the cord angle to 30 degrees or less, the tire circumferential direction during high-speed running can be dealt with. Can be sufficiently exhibited, and the high-speed durability can be sufficiently satisfied.
【００１８】ベルトコードの引張り弾性率は４０００ｋ
ｇｆ／ｍｍ2 以上とすることで上記したようなタイヤ周
方向へのタガ効果を十分に発揮させることができる。The tensile modulus of the belt cord is 4000k.
By setting the gf / mm 2 or more, the hoop effect in the tire circumferential direction as described above can be sufficiently exerted.
【００１９】サイドウォール部の厚さ寸法は、用途に応
じて、０．５〜３．５ｍｍの範囲で適宜設定することが
望ましい。例えば、競技用等で長期間の気密性を必要と
しない場合には０．５ｍｍ程度でよい。一般用途のよう
に長期間の気密性を必要とする場合には重量的に許容さ
れる範囲で３．５ｍｍ以内の厚さに設定すればよい。It is desirable that the thickness of the side wall portion is appropriately set in the range of 0.5 to 3.5 mm depending on the application. For example, when a long-term airtightness is not required for a game or the like, it may be about 0.5 mm. When long-term airtightness is required as in general use, the thickness may be set to 3.5 mm or less within the range allowed by weight.
【００２０】ベルトの半径方向外側には実質的に該ベル
トを覆う以下の構造のバンドが隣接して配置するのが望
ましい。このバンドは有機または無機材からなる１本以
上のコードをゴム被覆して成る長尺かつ小幅の帯状プラ
イをタイヤ赤道に対し鋭角に傾けて螺旋巻きしてなり、
このバンドを形成する前記コードの引張り弾性率は２０
０ｋｇｆ／ｍｍ2 以上であることが望ましい。２００ｋ
ｇｆ／ｍｍ2 以上で剛性が十分となり、前記高弾性コー
ドからなるベルトの動きをより強く抑制することがで
き、高速走行時の高速耐久性がさらに向上する。It is desirable that a band having the following structure substantially covering the belt is disposed adjacent to the belt in the radial outer side thereof. This band is formed by spirally winding a long and narrow band-like ply formed by rubber coating one or more cords made of an organic or inorganic material at an acute angle to the tire equator,
The cord forming this band has a tensile modulus of 20.
Desirably, it is 0 kgf / mm 2 or more. 200k
With gf / mm 2 or more, the rigidity becomes sufficient, the movement of the belt made of the high-elasticity cord can be suppressed more strongly, and the high-speed durability during high-speed running is further improved.
【００２１】本発明は、サイドウォールゴムのＭ100 の
値は７０〜１１０ｋｇｆ／ｃｍ2 に設定するが、このサ
イドウォールゴムのＪＩＳスプリング式Ａ硬度は７０〜
１００度であることが望ましい。７０度以上だとゴムは
柔らかすぎず十分な補強効果を得ることが可能であり、
１００度以下だとゴムの耐疲労性が十分であり、クラッ
クが生じにくい。In the present invention, the value of M100 of the side wall rubber is set to 70 to 110 kgf / cm 2, and the JIS spring type A hardness of the side wall rubber is 70 to 110 kgf / cm 2.
Desirably it is 100 degrees. If it is 70 degrees or more, the rubber is not too soft and can obtain a sufficient reinforcing effect,
When it is less than 100 degrees, the fatigue resistance of the rubber is sufficient, and cracks hardly occur.
【００２２】[0022]
【発明の実施の形態】図１は本発明の一の実施形態を示
すタイヤの断面図であり、同タイヤ１は、トレッド部２
と、トレッド部２に連なる一対のサイドウォール部３
と、サイドウォール部３に連なる一対のビード部４とを
具備し、偏平率が４５％である。FIG. 1 is a cross-sectional view of a tire showing one embodiment of the present invention.
And a pair of sidewall portions 3 connected to the tread portion 2
And a pair of bead portions 4 connected to the side wall portion 3, and the flatness is 45%.
【００２３】両ビード部４にまたがるカーカス５は、カ
ーカスコードがタイヤ赤道に対し実質的に直交する方向
に延びる２枚の第１カーカスプライ５ａ、第２カーカス
プライ５ｂから成る。第１・第２カーカスプライ５ａ、
５ｂはビード部４のビードコア４ａを巻き上げ、第１カ
ーカスプライ５ａのプライ端部は後述するベルト６のベ
ルト端部下に達し、第２カーカスプライ５ｂのプライ端
部はサイドウォール部３のタイヤ最大幅位置高さよりも
下方に位置する。The carcass 5 straddling both bead portions 4 is composed of two first carcass plies 5a and second carcass plies 5b whose carcass cords extend in a direction substantially perpendicular to the tire equator. First and second carcass plies 5a,
5b winds up the bead core 4a of the bead part 4, the ply end of the first carcass ply 5a reaches below the belt end of the belt 6 described later, and the ply end of the second carcass ply 5b is the tire maximum width of the sidewall part 3. It is located below the position height.
【００２４】カーカス５の半径方向外側に配置されるベ
ルト６は、タイヤ半径方向内側の幅広ベルトプライ６
ａ、タイヤ半径方向外側の幅狭ベルトプライ６ｂの二枚
のベルトプライから成り、両ベルトプライ６ａ、６ｂの
ベルトコードはタイヤ赤道に対し２０度で互いに交差す
る方向に延びている。両ベルトコードはスチールコード
から構成され、両ベルトコードの引張り弾性率は１８０
００ｋｇｆ／ｍｍ2 である。ベルト６の最大幅（第１ベ
ルトプライ６ａの幅が該当）はタイヤ接地幅Ｗの１１０
％である。The belt 6 disposed radially outside the carcass 5 is a wide belt ply 6 inside the tire radially.
a, two belt plies of a narrow belt ply 6b on the tire radial outside, and the belt cords of both belt plies 6a, 6b extend in a direction crossing each other at 20 degrees to the tire equator. Both belt cords are composed of steel cords and the tensile modulus of both belt cords is 180
00 kgf / mm 2 . The maximum width of the belt 6 (corresponding to the width of the first belt ply 6a) is 110 of the tire contact width W.
%.
【００２５】サイドウォール部３は、ビード部４よりタ
イヤ断面高さ（Ａ）の６０％の高さ（Ｂ）に延在してい
る。同サイドウォール部３を形成するサイドウォールゴ
ムのＭ100 の値は９０ｋｇｆ／ｃｍ2 である。サイドウ
ォール部３は下端から上端にかけて厚さ寸法が配置の全
領域にわたり１．５〜２．５ｍｍであり、実質的に滑ら
かな平坦形状をしている。The sidewall 3 extends from the bead 4 to a height (B) that is 60% of the tire cross-section height (A). The value of M100 of the side wall rubber forming the side wall portion 3 is 90 kgf / cm 2 . The sidewall portion 3 has a thickness dimension of 1.5 to 2.5 mm from the lower end to the upper end over the entire area of the arrangement, and has a substantially smooth flat shape.
【００２６】トレッド部２を形成するトレッドゴムは、
ＪＩＳスプリング式Ａ硬度が６０度であり、かつ、Ｍ10
0 の値が１８ｋｇｆ／ｃｍ2 である。サイドウォールゴ
ムのＭ100 の値はトレッドゴムのＭ100 の値よりも大き
く、同サイドウォールゴムのＭ100 の値とトレッドゴム
のＭ100 の値との差は７２ｋｇｆ／ｃｍ2 である。The tread rubber forming the tread portion 2 is
JIS spring type A hardness is 60 degrees and M10
The value of 0 is 18 kgf / cm 2 . The value of M100 of the sidewall rubber is larger than the value of M100 of the tread rubber, and the difference between the value of M100 of the sidewall rubber and the value of M100 of the tread rubber is 72 kgf / cm 2 .
【００２７】ベルト６の半径方向外側には実質的にベル
ト６を覆うバンド７が隣接して配置されている。バンド
７はナイロンコードをゴム被覆して成る長尺かつ小幅の
帯状プライをタイヤ赤道に対し鋭角に傾けて螺旋巻きし
てなる。バンド７を形成するナイロンコードのＭ100 の
値は３５０ｋｇｆ／ｃｍ2 である。バンド７の半径方向
外側にはベルト６のベルト端部をカバーするバンド補助
層８がバンド７の側端部に位置して配置されている。A band 7 that substantially covers the belt 6 is disposed adjacent to the outside of the belt 6 in the radial direction. The band 7 is formed by spirally winding a long and narrow band-shaped ply made of rubber covered with a nylon cord at an acute angle to the tire equator. The value of M100 of the nylon cord forming the band 7 is 350 kgf / cm 2 . A band auxiliary layer 8 that covers the end of the belt 6 in the radial direction outside the band 7 is disposed at a side end of the band 7.
【００２８】[0028]
【実施例】本発明の効果を確かめるべく図１に示す本発
明タイヤ及び図２に示す比較タイヤを表１に従い試作し
た。タイヤサイズはいずれも２３５／４５ＺＲ１７であ
る。図２に示す比較タイヤはサイドウォール部３のゴム
のＭ100 が１２ｋｇｆ／ｃｍ2 であり、ビード部４に１
枚のゴム被覆スチールコードから成るビード補強層２１
を配置し、ビードコア４ａおよびビードエペックスを包
むフリッパー２２を配置している。それ以外の構造は図
１のタイヤと同一である。EXAMPLE In order to confirm the effects of the present invention, a tire according to the present invention shown in FIG. 1 and a comparative tire shown in FIG. All tire sizes are 235 / 45ZR17. In the comparative tire shown in FIG. 2, the rubber M100 of the sidewall portion 3 is 12 kgf / cm 2 ,
Bead reinforcing layer 21 made of two rubber-coated steel cords
And a flipper 22 that surrounds the bead core 4a and the bead epex is disposed. The other structure is the same as that of the tire of FIG.
【００２９】高速耐久性（表１）と高速操縦安定性（表
２）について評価した。高速耐久性は、ドラム試験機に
より以下の条件で行った。 荷重：４２０ｋｇｆ、 内圧：２．０ｋｇ／ｃｍ2 速度条件：１５０ｋｍ／ｈを初速度とし、以降段階的に
１０ｋｍ／ｈずつ速度を増し、結果は比較タイヤの故障
速度を１００として指数表示してある。各速度ステップ
の途中で故障した場合はその時間に比例して速度を換算
している。High-speed durability (Table 1) and high-speed steering stability (Table 2) were evaluated. The high-speed durability was measured by a drum tester under the following conditions. Load: 420 kgf, Internal pressure: 2.0 kg / cm 2 Speed condition: The initial speed is 150 km / h, and thereafter the speed is increased stepwise by 10 km / h, and the result is indicated as an index with the failure speed of the comparative tire as 100. . If a failure occurs in the middle of each speed step, the speed is converted in proportion to the time.
【００３０】高速操縦安定性は、サーキット走行におい
て、ラップタイム、高速直進性、制動・駆動特性、ステ
アリングレスポンス性、振動乗り心地性について、熟練
ドライバーその他計測員が評価を行った。The high-speed steering stability was evaluated by a skilled driver and other measurement personnel with respect to lap time, high-speed straightness, braking / driving characteristics, steering response, and vibration riding comfort during circuit running.
【００３１】ラップタイムは、サーキット走行におい
て、３周のラップライムを計測し、１周あたりの平均ラ
ップタイムを算出し、比較した。Lap times were measured by measuring lap times of three laps during circuit running, and calculating and comparing average lap times per lap.
【００３２】転がり抵抗は、荷重４２０ｋｇｆ、内圧
２．０ｋｇ／ｃｍ2 にて直径１７０７ｍｍのドラムに供
試タイヤを押し付け、１００ｋｍ／ｈを越えるまでいっ
たん回転駆動したのち、直ちにクラッチを切り、惰性回
転中の５０ｋｍ／ｈにおける減速度の度合につき、比較
タイヤを１００として指数表示した。The rolling resistance was such that the test tire was pressed against a 1707 mm diameter drum under a load of 420 kgf and an internal pressure of 2.0 kg / cm 2, and was once driven to rotate until it exceeded 100 km / h. The index of the degree of the deceleration at 50 km / h was expressed as an index with the comparative tire as 100.
【００３３】高速直進性、制動・駆動特性、ステアリン
グレスポンス性、振動乗り心地性は、上記熟練ドライバ
ーによる官能評価を行い、比較タイヤを基準とした評点
で示した。（＋）評点は比較タイヤより良好、（−）評
点はその逆である。The high-speed straightness, braking / driving characteristics, steering response, and vibration riding comfort were evaluated by a sensory evaluation using the above-mentioned skilled driver, and indicated by scores based on comparative tires. The (+) score is better than the comparative tire, and the (-) score is the opposite.
【００３４】[0034]
【発明の効果】本発明によると、高速耐久性が向上する
とともに、高速旋回時の操縦性能および高速走行時の制
動・駆動性能がともに向上する。また、タイヤ重量が軽
量化され、転がり抵抗が低減する。According to the present invention, the high-speed durability is improved, and the steering performance at the time of high-speed turning and the braking / driving performance at the time of high-speed running are both improved. Further, the tire weight is reduced, and the rolling resistance is reduced.
【表１】 [Table 1]
【表２】 [Table 2]
【図１】本発明による高性能偏平空気入りラジアルタイ
ヤの幅方向断面図、FIG. 1 is a cross-sectional view in the width direction of a high-performance flat pneumatic radial tire according to the present invention;
【図２】比較タイヤの幅方向断面図である。FIG. 2 is a cross-sectional view in the width direction of a comparative tire.
１ タイヤ ２ トレッド部 ３ サイドウォール部 ４ ビード部 ５ カーカス ６ ベルト ７ バンド ８ バンド補助層 DESCRIPTION OF SYMBOLS 1 Tire 2 Tread part 3 Side wall part 4 Bead part 5 Carcass 6 Belt 7 Band 8 Band auxiliary layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ６０Ｃ 9/08 Ｂ６０Ｃ 9/08 Ｈ 9/18 9/18 Ｎ 9/20 9/20 Ｅ Ｄ 9/22 9/22 Ｃ Ｄ 11/00 11/00 Ｄ ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI B60C 9/08 B60C 9/08 H 9/18 9/18 N 9/20 9/20 ED 9/22 9/22 CD 11/00 11/00 D
Claims (8)
一対のサイドウォール部と、このサイドウォール部に連
なる一対のビード部とを具備し、カーカスコードがタイ
ヤ赤道に対し実質的に直交する方向に延びる少なくとも
一枚のカーカスプライから成るカーカスと、このカーカ
スと前記トレッド部との間に配置されかつベルトコード
がタイヤ赤道に対し鋭角で互いに交差する方向に延びる
少なくとも二枚のベルトプライから成るベルトとを有
し、偏平率６０％以下の高性能偏平空気入りラジアルタ
イヤにおいて、 前記サイドウォール部は、タイヤを適用リムに装着し、
規定の空気圧とし、無負荷の状態で前記ビード部よりタ
イヤ断面高さの５０％〜８５％まで延在し、かつ、この
サイドウォール部を形成するサイドウォールゴムは、１
００％伸張時の引張り弾性率（Ｍ100 ）が７０〜１１０
ｋｇｆ／ｃｍ2 であることを特徴とする高性能偏平空気
入りラジアルタイヤ。The carcass cord includes a tread portion, a pair of sidewall portions connected to the tread portion, and a pair of bead portions connected to the sidewall portion, wherein the carcass cord extends in a direction substantially orthogonal to the tire equator. A carcass comprising at least one carcass ply extending therefrom; and a belt comprising at least two belt plies disposed between the carcass and the tread portion and having a belt cord extending in a direction crossing each other at an acute angle to the tire equator. In a high-performance flat pneumatic radial tire having a flattening rate of 60% or less, the sidewall portion mounts the tire on an applicable rim,
The sidewall rubber extending from the bead portion to 50% to 85% of the tire cross-section height under a no-load condition at a specified air pressure and forming the sidewall portion is 1
Tensile modulus at 100% elongation (M100) 70-110
A high-performance flat pneumatic radial tire having a weight of kgf / cm 2 .
は、ＪＩＳスプリング式Ａ硬度が５０度〜７０度であ
り、かつ、１００％伸張時の引張り弾性率（Ｍ100 ）が
５〜３０ｋｇｆ／ｃｍ2 であり、前記サイドウォールゴ
ムのＭ100 の値は当該トレッドゴムのＭ100 の値よりも
大きく、同サイドウォールゴムのＭ100 の値と当該トレ
ッドゴムのＭ100 の値との差は５０〜１０５ｋｇｆ／ｃ
ｍ2 であることを特徴とする請求項１記載の高性能偏平
空気入りラジアルタイヤ。2. The tread rubber forming the tread portion has a JIS spring type A hardness of 50 to 70 degrees and a tensile elastic modulus (M100) at 100% elongation of 5 to 30 kgf / cm 2 . The value of M100 of the sidewall rubber is larger than the value of M100 of the tread rubber, and the difference between the value of M100 of the sidewall rubber and the value of M100 of the tread rubber is 50 to 105 kgf / c.
High-performance flat pneumatic radial tire according to claim 1, characterized in that the m 2.
に装着し、規定の空気圧とし、規定の質量に対応する負
荷を加えたときのトレッド接地幅の１００％〜１２５％
であることを特徴とする請求項１または２に記載の高性
能偏平空気入りラジアルタイヤ。3. The maximum width of the belt is 100% to 125% of a tread contact width when a tire is mounted on an applicable rim, a specified air pressure is applied, and a load corresponding to a specified mass is applied.
The high performance flat pneumatic radial tire according to claim 1 or 2, wherein:
赤道に対し１５〜３０度であり、かつ、コードの引張り
弾性率が４０００ｋｇｆ／ｍｍ2 以上であることを特徴
とする請求項１〜３に記載の高性能偏平空気入りラジア
ルタイヤ。4. The belt cord according to claim 1, wherein the cord angle is 15 to 30 degrees with respect to the tire equator, and the tensile modulus of the cord is 4000 kgf / mm 2 or more. The described high performance flat pneumatic radial tire.
成ることを特徴とする請求項１〜４に記載の高性能偏平
空気入りラジアルタイヤ。5. The high performance flat pneumatic radial tire according to claim 1, wherein the belt cord is made of a steel cord.
ードから成ることを特徴とする請求項１〜４に記載の高
性能偏平空気入りラジアルタイヤ。6. The high performance flat pneumatic radial tire according to claim 1, wherein said belt cord is made of an aromatic polyamide cord.
〜３．５ｍｍであることを特徴とする請求項１〜６に記
載の高性能偏平空気入りラジアルタイヤ。7. The thickness of the sidewall portion is 0.5
The high performance flat pneumatic radial tire according to any one of claims 1 to 6, wherein the diameter is from 3.5 to 3.5 mm.
ルトを覆うバンドが隣接して配置され、このバンドは有
機または無機材からなる１本以上のコードをゴム被覆し
て成る長尺かつ小幅の帯状プライをタイヤ赤道に対し鋭
角に傾けて螺旋巻きしてなり、このバンドを形成する前
記コードの引張り弾性率は２００ｋｇｆ／ｍｍ2 以上で
あることを特徴とする請求項１〜７に記載の高性能偏平
空気入りラジアルタイヤ。8. A belt substantially radially outside the belt and substantially covering the belt is disposed adjacent to the belt, and the band is a long and rubber-coated one or more cords made of an organic or inorganic material. The narrow elastic band ply is spirally wound at an acute angle to the tire equator, and the cord forming the band has a tensile modulus of elasticity of 200 kgf / mm 2 or more. High performance flat pneumatic radial tire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13547497A JP3749351B2 (en) | 1996-07-22 | 1997-05-26 | High performance flat pneumatic radial tire |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8-192002 | 1996-07-22 | ||
| JP19200296 | 1996-07-22 | ||
| JP13547497A JP3749351B2 (en) | 1996-07-22 | 1997-05-26 | High performance flat pneumatic radial tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1086616A true JPH1086616A (en) | 1998-04-07 |
| JP3749351B2 JP3749351B2 (en) | 2006-02-22 |
Family
ID=26469320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13547497A Expired - Fee Related JP3749351B2 (en) | 1996-07-22 | 1997-05-26 | High performance flat pneumatic radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3749351B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2866829A1 (en) * | 2004-02-20 | 2005-09-02 | Sumitomo Rubber Ind | Pneumatic tire for competition car has carcass and belt reinforced by layers of organic fibre cables at an angle to the tire's equator |
| JP2006341705A (en) * | 2005-06-08 | 2006-12-21 | Sumitomo Rubber Ind Ltd | Pneumatic radial tire |
| JP2008265453A (en) * | 2007-04-18 | 2008-11-06 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| JP2009196616A (en) * | 2008-02-25 | 2009-09-03 | Bridgestone Corp | Pneumatic radial tire |
| JP2009255867A (en) * | 2008-04-21 | 2009-11-05 | Yokohama Rubber Co Ltd:The | Pneumatic tire with tread pattern |
| JP2012250553A (en) * | 2011-05-31 | 2012-12-20 | Bridgestone Corp | Pneumatic tire |
| JP2015063172A (en) * | 2013-09-24 | 2015-04-09 | 東洋ゴム工業株式会社 | Pneumatic semi-radial tire |
| JP2015189253A (en) * | 2014-03-27 | 2015-11-02 | 横浜ゴム株式会社 | Pneumatic tire |
| CN110254141A (en) * | 2014-11-12 | 2019-09-20 | 横滨橡胶株式会社 | Collision avoidance system |
| CN114013220A (en) * | 2021-10-21 | 2022-02-08 | 中策橡胶集团有限公司 | Tire with improved controllability |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2866829A1 (en) * | 2004-02-20 | 2005-09-02 | Sumitomo Rubber Ind | Pneumatic tire for competition car has carcass and belt reinforced by layers of organic fibre cables at an angle to the tire's equator |
| JP2006341705A (en) * | 2005-06-08 | 2006-12-21 | Sumitomo Rubber Ind Ltd | Pneumatic radial tire |
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| JP2009255867A (en) * | 2008-04-21 | 2009-11-05 | Yokohama Rubber Co Ltd:The | Pneumatic tire with tread pattern |
| JP2012250553A (en) * | 2011-05-31 | 2012-12-20 | Bridgestone Corp | Pneumatic tire |
| JP2015063172A (en) * | 2013-09-24 | 2015-04-09 | 東洋ゴム工業株式会社 | Pneumatic semi-radial tire |
| JP2015189253A (en) * | 2014-03-27 | 2015-11-02 | 横浜ゴム株式会社 | Pneumatic tire |
| CN110254141A (en) * | 2014-11-12 | 2019-09-20 | 横滨橡胶株式会社 | Collision avoidance system |
| CN114013220A (en) * | 2021-10-21 | 2022-02-08 | 中策橡胶集团有限公司 | Tire with improved controllability |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3749351B2 (en) | 2006-02-22 |
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