JP3715738B2 - Pneumatic radial tire - Google Patents

Pneumatic radial tire Download PDF

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Publication number
JP3715738B2
JP3715738B2 JP04883297A JP4883297A JP3715738B2 JP 3715738 B2 JP3715738 B2 JP 3715738B2 JP 04883297 A JP04883297 A JP 04883297A JP 4883297 A JP4883297 A JP 4883297A JP 3715738 B2 JP3715738 B2 JP 3715738B2
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Prior art keywords
reinforcing rubber
tire
rubber layer
belt
peripheral side
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Expired - Fee Related
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JP04883297A
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JPH10244817A (en
Inventor
照彦 小嶋
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Bridgestone Corp
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Bridgestone Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0036—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width
    • B60C15/0045—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width with ply turn-up up to the belt edges, i.e. folded around the bead core and extending to the belt edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B60C17/0018—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts two or more inserts in each sidewall portion

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は空気入りラジアルタイヤ、なかでも、パンクや空気漏れが生じても安全走行可能なランフラットタイヤに関するものである。
【０００２】
【従来の技術】
空気入りラジアルタイヤでは一般に、ビード部を補強するビードフィラの半径方向外端、ラジアルカーカスの折返し端等の部材端をタイヤのサイド部に位置させており、タイヤのパンクや空気漏れによってそれが低圧下で負荷転動する場合には、タイヤサイド部の部材端と対応する部分に歪が集中して、その部分にて破損し易いことから、このようなタイヤをランフラットタイヤとしても機能させる場合には、従来は、ラジアルカーカスの本体部分の内周側に補強ゴム層を配設することにより対処していた。
【０００３】
【発明が解決しようとする課題】
しかるに、このような従来技術において、カーカス本体部分の内周側に配設した一層の補強ゴム層をもって、タイヤのサイド部への破損の発生を十分に阻止するためには、補強ゴム層の厚さが必然的に厚くなり、これがため、タイヤの重量が大きくなるのみならず、タイヤの通常の使用状態における車両への乗り心地が悪化するという不都合があった。
【０００４】
この発明は、従来技術が抱えるこのような不都合を取り除くべくなされたものであり、従来技術に比して、タイヤ重量を有効に低減し、併せて、車両への乗り心地を向上させることができる空気入りラジアルタイヤを提供するものである。
【０００５】
【課題を解決するための手段】
この発明の空気入りラジアルタイヤは、少なくとも一枚のカーカスプライからなるラジアルカーカスを、ビードコアの周りで内側から外側へ折返して巻上げるとともに、ラジアルカーカスのクラウン部の外周側にベルトを配置し、また、ラジアルカーカスの本体部分の内周側に一層の補強ゴム層を、そして、前記本体部分と折返し部分との間に他の一層の補強ゴム層をそれぞれ設けたものにおいて、両補強ゴム層を、ビード部から、ベルトの内周側位置までの間に配設して、それらの補強ゴム層の半径方向外端縁を、ベルトの側縁よりタイヤ幅方向の内側に位置させるとともに、ラジアルカーカスの折返し端を、ベルトの内周側で、いずれの補強ゴム層の端縁よりも、タイヤ幅方向の中央部寄りに位置させたものである。
【０００６】
この空気入りラジアルタイヤでは、少なくとも、ラジアルカーカスの本体部分と折返し部分との間に配設した、従来タイヤのビードフィラに相当する補強ゴム層が、それの半径方向外端をタイヤのサイド部で終了させることなく、ベルトの内周側位置まで延びることから、タイヤの内圧が低下しても、タイヤのサイド部への歪の集中を抑制することが可能となり、これにより、補強ゴム層のトータル厚みを低減させてなお、タイヤのサイド部への破損の発生を有効に阻止することができるので、タイヤ重量の軽量化および、車両への乗り心地の改善を有利に実現することができる。
またここでは、ラジアルカーカスの折返し端を、タイヤのサイド部を越えて、ベルトの内周側で、いずれの補強ゴム層の端縁よりも、タイヤ幅方向の中央寄りに位置させることにより、ラジアルカーカスの折返し端をもまたタイヤのサイド部から排除して、そのサイド部に生じる歪みをより有効に分散させることができるので、補強ゴム層のトータル厚みをさらに減じてサイド部の耐久性をより向上させることができる。
しかもここでは、カーカスの折返し端を、いずれの補強ゴム層の端縁よりも、タイヤ幅方向内側に位置させることで、サイド部の歪を分散させることが出来、耐久性が向上する。つまり、補強ゴム層を薄くすることができる為、乗り心地、重量低減に役立つ。
【０００７】
かかるタイヤにおいて好ましくは、ベルトの内周側に位置するそれぞれの補強ゴム層の端縁の、タイヤ幅方向の相対距離を５ｍｍ以上とし、また好ましくは、それぞれの補強ゴム層のゴム硬度を、ＪＩＳ Ａ硬度で７０〜９０度の範囲とする。
【０００８】
ここで前者によれば、両補強ゴム層の端縁のいずれか一方を、他方の端縁に対してタイヤの幅方向に５ｍｍ以上の距離を隔てて位置させることで、補強ゴム端の歪をさらに分散し、補強ゴム層とカーカス部のセパレーションを抑制することができる。
また、ゴム硬度を７０〜９０度とする後者によれば、耐久性、タイヤ重量、乗り心地のそれぞれを有利にバランスさせることができる。
つまり、ゴム硬度が７０度未満では、補強ゴム層を厚くする必要があり、重量上のメリットが少なくなり、それが９０度を越えると、屈曲性が悪化し、乗り心地が悪くなるとともに、耐久性もまた悪化する。
【００１１】
【発明の実施の形態】
以下にこの発明の実施の形態を図面に示すところに基づいて説明する。
図１はこの発明の一の実施形態を示す、タイヤ幅方向の断面図である。
ここでは、一枚のカーカスプライからなるラジアルカーカス１のそれぞれの側部を、ビードコア２の周りで内側から外側へ折返して巻上げるとともに、そのラジアルカーカス１のクラウン部の外周側に、二層のベルト層からなるベルト３を、また、このベルト３のさらに外周側にトレッドゴム４をそれぞれ配設する。
【００１２】
ここにおいて、ラジアルカーカス１の本体部分１ａの内周側に一層の補強ゴム層５を設けるとともに、その本体部分１ａと、ラジアルカーカス１の折返し部分１ｂとの間に他の一層の補強ゴム層６を設け、それらの両補強ゴム層５，６を、ビード部７からベルト３の内周側位置までの間に配設することで、それぞれの補強ゴム層５，６の半径方向の外端縁を、ベルト３の側縁よりタイヤ幅方向の内側に位置させる。
【００１３】
また好ましくは、補強ゴム層６の半径方向外端縁を、補強ゴム層５の同様の外端縁に対し、タイヤ幅方向内側へ５ｍｍ以上の距離を隔てて位置させ、さらに、ラジアルカーカス１の折返し端を、それらのいずれの外端縁よりもタイヤ幅方向の内側に位置させる。
【００１４】
そしてより好ましくは、このようにして配設されるそれぞれの補強ゴム層５，６のゴム硬度を、ＪＩＳ Ａ硬度で７０〜９０度の範囲とする。
【００１５】
このように構成してなるタイヤでは、サイド部に部材端が一切存在しないことから、サイド部に生じる歪を十分に分散させることができ、これにより、補強ゴム層５，６のトータル厚みを従来技術に比して低減させてなお、そのサイド部の耐久性を有効に向上させることができるので、タイヤ重量の軽量化および、車両への乗り心地の改善を有利に実現することができる。
【００１６】
【実施例】
図１に示す基本構造を有し、図にＡ，Ｂ，Ｃで示す寸法、すなわち、ベルト側縁から、カーカス折返し端、補強ゴム層６の半径方向外端および補強ゴム層５の半径方向外端までのそれぞれの距離を種々に変化させるとともに、それぞれの補強ゴム層５，６の硬度および最大厚みを変化させた、サイズが２０５／６５Ｒ１５のそれぞれのタイヤを、６ 1／2 Ｊ×１５のリムにリム組みするとともに、エアバルブの開放下で、４６５ｋｇｆの荷重を負荷して、外表面にクラックが発生するまでの走行距離を、ドラム耐久試験によって測定したところ、表１に示す通りとなった。
なお表中の正の値は、ベルト側縁から、ベルト幅方向に沿って、その内側方向に測った寸法を示し、負の値は、ベルト端から、カーカス本体に沿って半径方向内方に向けて測定した寸法を示す。
【００１７】
【表１】

Figure 0003715738
【００１８】
表１に示すところによれば、発明タイヤでは、タイヤサイド部に生じる歪みの分散によって、従来タイヤに比し、ランフラット走行距離を大きく延長させ得ることが明らかである。従って、ランフラット走行距離の過剰増加分を考慮した場合には、補強ゴム層の厚みを減じて、タイヤ重量の軽減をも実現することができる。
【００１９】
【発明の効果】
以上に述べたところから明らかなように、この発明によれば、タイヤの内圧低下時にサイド部に生じる歪みを、従来技術に比して十分に分散させることができ、これがため、補強ゴム層のトータル厚みを減少させてなお、ランフラット走行距離を十分に確保することができるので、タイヤ重量を軽減するとともに、通常走行時の乗り心地を向上させることができる。
【図面の簡単な説明】
【図１】この発明の一の実施形態を示すタイヤ幅方向断面図である。
【符号の説明】
１ ラジアルカーカス
１ａ 本体部分
１ｂ 折返し部分
２ ビードコア
３ ベルト
４ トレッドゴム
５，６ 補強ゴム層
７ ビード部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic radial tire, and more particularly to a run-flat tire that can travel safely even if puncture or air leakage occurs.
[0002]
[Prior art]
In general, pneumatic radial tires have radial ends of bead fillers that reinforce the bead portions and ends of radial carcass folded-back ends, etc., located on the side of the tire. When rolling with a load, the strain concentrates on the part corresponding to the end of the tire side part and easily breaks at that part. Conventionally, this problem has been dealt with by arranging a reinforcing rubber layer on the inner peripheral side of the main body portion of the radial carcass.
[0003]
[Problems to be solved by the invention]
However, in such a conventional technique, in order to sufficiently prevent the occurrence of damage to the side portion of the tire with a single reinforcing rubber layer disposed on the inner peripheral side of the carcass main body portion, the thickness of the reinforcing rubber layer is This inevitably increases the thickness of the tire, which not only increases the weight of the tire but also deteriorates the riding comfort of the vehicle in the normal use state of the tire.
[0004]
The present invention has been made to eliminate such inconveniences of the prior art, and can effectively reduce the tire weight and improve the riding comfort of the vehicle as compared with the prior art. A pneumatic radial tire is provided.
[0005]
[Means for Solving the Problems]
The pneumatic radial tire according to the present invention is configured to fold up a radial carcass made of at least one carcass ply from the inside to the outside around the bead core, arrange a belt on the outer peripheral side of the crown portion of the radial carcass, and A layer of reinforcing rubber layer on the inner peripheral side of the main body portion of the radial carcass, and another layer of reinforcing rubber layer provided between the main body portion and the folded portion, respectively. from the bead portion, and disposed between the to the inner peripheral side position of the belt, the radially outer edge of their reinforcing rubber layer, Rutotomoni is positioned from the side edge of the belt on the inner side in the tire width direction, the radial carcass The folded end is positioned closer to the center in the tire width direction than the edge of any reinforcing rubber layer on the inner peripheral side of the belt .
[0006]
In this pneumatic radial tire, at least the reinforcing rubber layer corresponding to the bead filler of the conventional tire disposed between the main car body portion and the folded portion of the radial carcass ends at the radially outer end thereof at the side portion of the tire. Since it extends to the inner peripheral side position of the belt, it is possible to suppress the concentration of strain on the side portion of the tire even when the internal pressure of the tire is reduced, and thereby the total thickness of the reinforcing rubber layer However, the occurrence of damage to the side portion of the tire can be effectively prevented, so that the weight of the tire can be reduced and the riding comfort of the vehicle can be advantageously realized.
Here, the radial carcass folding end is positioned closer to the center in the tire width direction than the edge of any reinforcing rubber layer on the inner peripheral side of the belt beyond the side of the tire. The folded end of the carcass can also be removed from the side portion of the tire to more effectively disperse the strain generated on the side portion, so that the total thickness of the reinforcing rubber layer can be further reduced and the durability of the side portion can be further increased. Can be improved.
In addition, since the folded end of the carcass is positioned on the inner side in the tire width direction than the end edge of any reinforcing rubber layer, the distortion of the side portion can be dispersed and the durability is improved. That is, since the reinforcing rubber layer can be made thin, it is useful for ride comfort and weight reduction.
[0007]
In such a tire, the relative distance in the tire width direction of the edge of each reinforcing rubber layer located on the inner peripheral side of the belt is preferably 5 mm or more, and preferably the rubber hardness of each reinforcing rubber layer is JIS. The A hardness is in the range of 70 to 90 degrees.
[0008]
Here, according to the former, either one of the edges of both reinforcing rubber layers is positioned at a distance of 5 mm or more in the width direction of the tire with respect to the other edge, so that the distortion of the reinforcing rubber edge is reduced. Furthermore, it can disperse | distribute and can suppress the separation of a reinforcement rubber layer and a carcass part.
Moreover, according to the latter which makes rubber hardness 70-90 degree | times, each of durability, tire weight, and riding comfort can be balanced advantageously.
In other words, if the rubber hardness is less than 70 degrees, it is necessary to increase the thickness of the reinforcing rubber layer, and the weight advantage is reduced. If it exceeds 90 degrees, the flexibility is deteriorated, the ride comfort is deteriorated, and the durability is increased. Sex is also worse.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the drawings.
FIG. 1 is a sectional view in the tire width direction showing one embodiment of the present invention.
Here, each side portion of the radial carcass 1 made of a single carcass ply is folded back from the inner side to the outer side around the bead core 2, and two layers are formed on the outer peripheral side of the crown portion of the radial carcass 1. A belt 3 composed of a belt layer is disposed, and a tread rubber 4 is disposed on the outer peripheral side of the belt 3.
[0012]
Here, one reinforcing rubber layer 5 is provided on the inner peripheral side of the main body portion 1 a of the radial carcass 1, and another single reinforcing rubber layer 6 is provided between the main body portion 1 a and the folded portion 1 b of the radial carcass 1. And the reinforcing rubber layers 5 and 6 are disposed between the bead portion 7 and the inner peripheral side position of the belt 3, so that the outer end edges in the radial direction of the respective reinforcing rubber layers 5 and 6 are provided. Is positioned on the inner side in the tire width direction from the side edge of the belt 3.
[0013]
Preferably, the radially outer edge of the reinforcing rubber layer 6 is located at a distance of 5 mm or more inward in the tire width direction with respect to the similar outer edge of the reinforcing rubber layer 5, and the radial carcass 1 The folded end is positioned on the inner side in the tire width direction than any of the outer end edges thereof.
[0014]
More preferably, the rubber hardness of each of the reinforcing rubber layers 5 and 6 disposed in this manner is set to a range of 70 to 90 degrees in terms of JIS A hardness.
[0015]
In the tire configured as described above, since there is no member end in the side portion, the strain generated in the side portion can be sufficiently dispersed, and thus the total thickness of the reinforcing rubber layers 5 and 6 can be reduced. Even if it is reduced as compared with the technology, the durability of the side portion can be effectively improved, so that the weight reduction of the tire and the improvement of the riding comfort to the vehicle can be advantageously realized.
[0016]
【Example】
1 has the basic structure shown in FIG. 1, and the dimensions indicated by A, B, and C in the drawing, that is, from the belt side edge, the carcass folded end, the radially outer end of the reinforcing rubber layer 6, and the radially outer side of the reinforcing rubber layer 5 Each of the tires with a size of 205 / 65R15 having various hardnesses and maximum thicknesses of the respective reinforcing rubber layers 5 and 6 was changed to 6 1/2 J × 15. When the rim was assembled to the rim, and a load of 465 kgf was applied with the air valve opened, the running distance until cracks occurred on the outer surface was measured by a drum durability test. .
The positive value in the table indicates the dimension measured in the inner direction along the belt width direction from the belt side edge, and the negative value is inward in the radial direction along the carcass body from the belt end. The measured dimensions are shown.
[0017]
[Table 1]
Figure 0003715738
[0018]
According to the results shown in Table 1, it is clear that in the inventive tire, the run-flat travel distance can be greatly extended by the dispersion of the distortion generated in the tire side portion as compared with the conventional tire. Therefore, when an excessive increase in the run-flat travel distance is taken into account, the thickness of the reinforcing rubber layer can be reduced to reduce the tire weight.
[0019]
【The invention's effect】
As is apparent from the above description, according to the present invention, the distortion generated in the side portion when the internal pressure of the tire is reduced can be sufficiently dispersed as compared with the prior art. Even if the total thickness is reduced, the run-flat travel distance can be sufficiently secured, so that the tire weight can be reduced and the riding comfort during normal travel can be improved.
[Brief description of the drawings]
FIG. 1 is a sectional view in the tire width direction showing one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Radial carcass 1a Body part 1b Folding part 2 Bead core 3 Belt 4 Tread rubber 5, 6 Reinforcement rubber layer 7 Bead part

Claims (4)

少なくとも一枚のカーカスプライからなるラジアルカーカスを、ビードコアの周りで内側から外側へ折返して巻上げるとともに、ラジアルカーカスのクラウン部の外周側にベルトを配置し、ラジアルカーカスの本体部分の内周側に一層の補強ゴム層を、ラジアルカーカスの本体部分と折返し部分との間に他の一層の補強ゴム層をそれぞれ設けてなるタイヤであって、
両補強ゴム層を、ビード部から、ベルトの内周側位置までの間に配設するとともに、ラジアルカーカスの折返し端を、ベルトの内周側で、いずれの補強ゴム層の端縁よりも、タイヤ幅方向の中央部寄りに位置させてなる空気入りラジアルタイヤ。A radial carcass consisting of at least one carcass ply is folded back from the inside to the outside around the bead core, and a belt is arranged on the outer peripheral side of the crown portion of the radial carcass, and on the inner peripheral side of the main body portion of the radial carcass. A tire in which one reinforcing rubber layer is provided with another reinforcing rubber layer between the radial carcass main body portion and the folded portion,
Both reinforcing rubber layers are arranged between the bead portion and the inner peripheral side position of the belt, and the folded end of the radial carcass is on the inner peripheral side of the belt, rather than the edge of any reinforcing rubber layer, pneumatic radial tire ing by positioning the center portion side of the tire width direction. ベルトの内周側に位置するそれぞれの補強ゴム層の端縁の、タイヤ幅方向の相対距離を５ｍｍ以上としてなる請求項１記載の空気入りラジアルタイヤ。  The pneumatic radial tire according to claim 1, wherein the relative distance in the tire width direction of the edge of each reinforcing rubber layer located on the inner peripheral side of the belt is 5 mm or more. それぞれの補強ゴム層のゴム硬度を、ＪＩＳ Ａ硬度で７０〜９０度の範囲としてなる請求項１もしくは２記載の空気入りラジアルタイヤ。  The pneumatic radial tire according to claim 1 or 2, wherein the rubber hardness of each reinforcing rubber layer is in the range of 70 to 90 degrees in terms of JIS A hardness. ラジアルカーカスの本体部分と折返し部分との間に設けた補強ゴム層の、ベルトの内周側に位置する端縁の、ベルト側縁からのタイヤ幅方向の距離を、ラジアルカーカスの本体部分の内周側に設けた補強ゴム層のそれより大きくしてなる請求項１〜３のいずれかに記載の空気入りラジアルタイヤ。 The distance in the tire width direction from the belt side edge of the edge of the reinforcing rubber layer provided between the radial carcass main body part and the folded part, located on the inner peripheral side of the belt, is determined in the radial carcass main body part. The pneumatic radial tire according to any one of claims 1 to 3, wherein the pneumatic radial tire is larger than that of a reinforcing rubber layer provided on a peripheral side .
JP04883297A 1997-03-04 1997-03-04 Pneumatic radial tire Expired - Fee Related JP3715738B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9902121B2 (en) * 2011-12-12 2018-02-27 Bridgestone Corporation Tire

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JP4073606B2 (en) 2000-05-17 2008-04-09 住友ゴム工業株式会社 Pneumatic tire
US6834696B1 (en) * 2000-06-29 2004-12-28 Bridgestone/Firestone North American Tire, Llc Runflat tire with cantilever-like sidewall construction
JP4568547B2 (en) * 2004-07-22 2010-10-27 株式会社ブリヂストン Pneumatic run flat tire
JP4943644B2 (en) * 2004-11-05 2012-05-30 株式会社ブリヂストン Pneumatic radial tire
DE102005002402A1 (en) * 2005-01-19 2006-07-27 Continental Aktiengesellschaft Vehicle tires
JP6910284B2 (en) * 2017-12-18 2021-07-28 株式会社ブリヂストン Pneumatic tires

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9902121B2 (en) * 2011-12-12 2018-02-27 Bridgestone Corporation Tire

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