JP2006192927A - Run-flat tire for passenger car - Google Patents

Run-flat tire for passenger car Download PDF

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JP2006192927A
JP2006192927A JP2005003675A JP2005003675A JP2006192927A JP 2006192927 A JP2006192927 A JP 2006192927A JP 2005003675 A JP2005003675 A JP 2005003675A JP 2005003675 A JP2005003675 A JP 2005003675A JP 2006192927 A JP2006192927 A JP 2006192927A
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tire
rubber
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flat tire
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JP4648008B2 (en
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Kenichi Sugimoto
健一 杉本
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a run-flat tire for a passenger car improved in run-flat durability to be a function of the run-flat tire and riding comfort at normal traveling. <P>SOLUTION: In this run-flat tire, a side reinforcing rubber layer 5 is made of rubber in which short fibers are oriented in the tire peripheral direction. When a dynamic elastic modulus in the tire peripheral direction at the time of a measurement at 150°C and distortion 1% is taken as E<SB>1</SB>and a dynamic elastic modulus in the tire radial direction is taken as E<SB>2</SB>in the tire, E<SB>1</SB>is ≥5 MPa, and E<SB>1</SB>/E<SB>2</SB>is a value ≥1.2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、乗用車用ランフラットタイヤに関するものである。さらに詳しくは、サイドウォール部に配設されたサイド補強ゴム層に短繊維をタイヤ周方向に配向させた特定ゴムを適用したランフラットタイヤ、特にランフラット耐久性と乗り心地性とを両立させた乗用車用ランフラットタイヤに関するものである。   The present invention relates to a passenger car run flat tire. More specifically, a run-flat tire in which a specific rubber in which short fibers are oriented in the tire circumferential direction is applied to the side reinforcing rubber layer disposed in the sidewall portion, particularly run-flat durability and ride comfort are compatible. The present invention relates to a run flat tire for passenger cars.

一般に、乗用車用ランフラットタイヤにおいては、サイドウォール部の剛性向上のために、ゴム組成物単体、あるいはゴム組成物と繊維などの複合体によるサイド補強ゴム層が配設されている。しかし、パンクなどによりタイヤの内部圧力(以下、内圧)が低下した場合での走行、いわゆるランフラット走行状態になると、タイヤのサイドウォール部分の変形が大きくなることに伴い、サイド補強ゴム層の変形も大きくなり発熱が進み、このような状態では、サイド補強ゴム層の破壊限界を越え、タイヤ故障に至るおそれがある。
一方、補強ゴムを薄くすると乗り心地性やタイヤ重量は改良されるが、ランフラット時の荷重を支えきれず、タイヤのサイドウォール部分の繰り返し変形が非常に大きくなり、ゴム組成物の発熱増大を招き、ランフラット耐久性は低下する。
In general, a run-flat tire for a passenger car is provided with a side reinforcing rubber layer made of a rubber composition alone or a composite of a rubber composition and a fiber in order to improve the rigidity of a sidewall portion. However, when the tire's internal pressure (hereinafter referred to as internal pressure) decreases due to puncture, etc., so-called run-flat driving state, the deformation of the side reinforcing rubber layer increases as the deformation of the sidewall portion of the tire increases. In such a state, the breakage limit of the side reinforcing rubber layer may be exceeded, resulting in a tire failure.
On the other hand, when the reinforcing rubber is made thinner, ride comfort and tire weight are improved, but the load during run-flat cannot be supported, and repeated deformation of the tire sidewall becomes very large, increasing the heat generation of the rubber composition. Inviting, run-flat durability is reduced.

このため、乗用車用ランフラットタイヤのサイド補強ゴム層としては、例えば短繊維としてアモルファス部分のガラス転移温度とクリスタル部分の融点が一定範囲にあるものを選択して用いる方法(特許文献1参照)、ファブリル化された不連続の短繊維の形態のアラミド繊維を含有させる方法(特許文献2参照)、ゴム中に短繊維を三次元に配列する方法(特許文献3参照)、短繊維をタイヤラジアル方向に配列して用いる方法(特許文献4参照)などが提案されている。
しかし、これら従来のランフラットタイヤにおいては乗り心地性についての配慮が充分でないため、これらの性能の両立は困難であり、また、サイド補強ゴム層において、タイヤ周方向の弾性率を向上させてランフラット耐久性能を向上させたとしても、タイヤ径方向の弾性率も大きくなり乗り心地性が大幅に低下し、さらには車両への悪影響も少なからざるものがあった。
For this reason, as a side reinforcing rubber layer of a run flat tire for passenger cars, for example, a method of selecting and using a short fiber having a glass transition temperature of an amorphous part and a melting point of a crystal part within a certain range (see Patent Document 1), A method of containing aramid fibers in the form of discontinuous short fibers fibrillated (see Patent Document 2), a method of arranging the short fibers in rubber three-dimensionally (see Patent Document 3), and the radial direction of the short fibers in the tire radial direction A method of arranging and using them (see Patent Document 4) has been proposed.
However, these conventional run-flat tires are not sufficiently considered in terms of ride comfort, and thus it is difficult to achieve both of these performances. In addition, the side reinforcing rubber layer has improved the elastic modulus in the tire circumferential direction to improve the run performance. Even if the flat durability performance is improved, the elastic modulus in the tire radial direction is also increased, the ride comfort is greatly reduced, and the adverse effects on the vehicle are not significant.

特開昭57−47025号公報JP-A-57-47025 特開平7−32828号公報JP-A-7-32828 特開平11−314508号公報JP 11-314508 A 特開平11−348512号公報JP 11-348512 A

上記の如く、従来のサイド補強ゴム層を用いたランフラットタイヤは、その構造上の特徴から内圧走行時タイヤ縦バネ定数が大きく乗り心地性が悪いことが最大の欠点であった。本発明は、このような状況下で,サイド補強ゴム層を工夫することにより、通常内圧時の乗り心地性は損なわずに必要なランフラット耐久性を確保できる乗用車用ランフラットタイヤを提供することを目的とするものである。   As described above, the conventional run-flat tire using the side reinforcing rubber layer has the biggest drawback that the tire longitudinal spring constant during internal pressure traveling is large and the riding comfort is poor due to its structural characteristics. Under such circumstances, the present invention provides a run-flat tire for a passenger car that can secure the required run-flat durability without deteriorating the ride comfort under normal internal pressure by devising the side reinforcing rubber layer. It is intended.

本発明においては、前記目的を達成するために検討を重ねた結果、サイド補強ゴム層として、短繊維をタイヤ周方向に配向させた特定ゴムを用いることが、乗り心地性とランフラット耐久性の両立に有効であり、さらには、サイド補強ゴム層のゲージを薄くしても、ランフラット耐久性を充分に確保できることを見出し、本発明を完成するに至った。   In the present invention, as a result of repeated studies to achieve the above object, it is possible to use a specific rubber in which short fibers are oriented in the tire circumferential direction as a side reinforcing rubber layer to improve ride comfort and run flat durability. It was effective in achieving both, and it was found that even if the gauge of the side reinforcing rubber layer is thin, run-flat durability can be sufficiently secured, and the present invention has been completed.

すなわち、本発明は、
1.カーカス層と、該カーカス層の外側に順次配置されたベルト、ベルト補強層及びトレッド部とを有し、該トレッド部の左右に配置された一対のサイドウォール部に断面が三日月状のサイド補強ゴム層を具備してなるランフラットタイヤであって、前記サイド補強ゴム層が、短繊維をタイヤ周方向に配向させたゴム組成物からなり、かつ150℃,歪み1%で測定したときのタイヤ周方向動的弾性率をE1、タイヤ径方向動的弾性率をE2としたとき、E1が5MPa以上であると共に、E1/E2が1.2以上の値であることを特徴とする乗用車用ランフラットタイヤ、
2.サイド補強ゴム層のゴム成分が、天然ゴム及び合成ジエン系ゴムから選ばれた少なくとも一種のゴムである前記1記載の乗用車用ランフラットタイヤ、
3.短繊維の繊維径が0.10〜20.0dtexである前記1又は2に記載の乗用車用ランフラットタイヤ、
4.短繊維の繊維長が0.5〜5.0mmである前記1〜3のいずれかに記載の乗用車用ランフラットタイヤ、
5.短繊維の熱収縮率が0.0〜5.0%である前記1〜4のいずれかに記載の乗用車用ランフラットタイヤ、
6.短繊維の融点が200℃以上のものである前記1〜5のいずれかに記載の乗用車用ランフラットタイヤ、
7.サイド補強ゴム層が、ゴム成分100質量部に対して短繊維を0.2〜5.0質量部配合したゴム組成物からなる前記1〜6のいずれかに記載の乗用車用ランフラットタイヤ、及び
8.短繊維が、ゴムとの接着のために表面処理されたものである前記1〜7のいずれかに記載の乗用車用ランフラットタイヤ
を提供するものである。
That is, the present invention
1. A side reinforcing rubber having a carcass layer, a belt sequentially disposed outside the carcass layer, a belt reinforcing layer, and a tread portion, and having a crescent-shaped cross section in a pair of side wall portions disposed on the left and right sides of the tread portion A run-flat tire comprising a layer, wherein the side reinforcing rubber layer is made of a rubber composition in which short fibers are oriented in the tire circumferential direction, and the tire circumference is measured at 150 ° C. and a strain of 1%. When the directional dynamic modulus is E 1 and the tire radial dynamic modulus is E 2 , E 1 is 5 MPa or more and E 1 / E 2 is a value of 1.2 or more. Run flat tires for passenger cars,
2. 2. The run-flat tire for a passenger car according to 1 above, wherein the rubber component of the side reinforcing rubber layer is at least one rubber selected from natural rubber and synthetic diene rubber.
3. The run-flat tire for passenger cars according to 1 or 2 above, wherein the fiber diameter of the short fibers is 0.10 to 20.0 dtex,
4). The run-flat tire for passenger cars according to any one of 1 to 3, wherein the short fiber has a fiber length of 0.5 to 5.0 mm,
5. The run-flat tire for passenger cars according to any one of 1 to 4 above, wherein the thermal shrinkage of the short fibers is 0.0 to 5.0%,
6). The run-flat tire for passenger cars according to any one of 1 to 5, wherein the short fiber has a melting point of 200 ° C or higher,
7). The run-flat tire for passenger cars according to any one of 1 to 6 above, wherein the side reinforcing rubber layer is composed of a rubber composition in which 0.2 to 5.0 parts by mass of short fibers are blended with respect to 100 parts by mass of the rubber component, and 8). The run-flat tire for passenger cars according to any one of 1 to 7 above, wherein the short fibers are surface-treated for adhesion to rubber.

本発明による乗用車用ランフラットタイヤは、内圧充填時の良好な乗り心地性を確保しつつ、ランフラット耐久性を大幅に向上させることができる。   The run-flat tire for a passenger car according to the present invention can greatly improve the run-flat durability while ensuring good riding comfort during internal pressure filling.

本発明のランフラットタイヤにおいては、サイド補強ゴム層として、短繊維をタイヤ周方向に配向させたゴムが用いられる。このように、サイド補強ゴム層を短繊維がタイヤ周方向に配向する形で配列させて構成した場合には、タイヤ径方向の弾性率(動的弾性率)の増加を抑えつつ、タイヤ周方向の弾性率(動的弾性率)の向上を大幅に大きくすることができるので、結果として、乗り心地性の低下を最小限に抑えたままでランフラット耐久性の向上が可能となる。ここで、サイド補強ゴム層についてのタイヤ径方向とは、ラジアルタイヤのカーカス層のコードと実質的に平行となる方向(ラジアル方向)を意味する。
さらに、本発明におけるタイヤのサイド補強ゴム層は、タイヤ周方向の動的弾性率(E1)が5MPa以上であり、かつタイヤ周方向の動的弾性率E1とタイヤ径方向の動的弾性率E2との比(E1/E2)が1.2以上であることが必要とされる。E1やE1/E2の値が前記値より低い場合には、乗り心地性とランフラット耐久性との充分な両立効果が得られない。この観点から、更にE1は10MPa以上、特に15MPa以上が好ましく、E1/E2は1.7以上が好ましい。
なお、動的弾性率E1及びE2は、150℃,歪み1%の条件で測定したときの値である。
In the run flat tire of the present invention, a rubber in which short fibers are oriented in the tire circumferential direction is used as the side reinforcing rubber layer. As described above, when the side reinforcing rubber layers are arranged so that the short fibers are oriented in the tire circumferential direction, the tire circumferential direction is suppressed while suppressing an increase in the elastic modulus (dynamic elastic modulus) in the tire radial direction. As a result, it is possible to improve the run-flat durability while minimizing the decrease in ride comfort. Here, the tire radial direction with respect to the side reinforcing rubber layer means a direction (radial direction) substantially parallel to the cord of the carcass layer of the radial tire.
Further, the tire side reinforcing rubber layer in the present invention has a dynamic elastic modulus (E 1 ) in the tire circumferential direction of 5 MPa or more, a dynamic elastic modulus E 1 in the tire circumferential direction, and a dynamic elasticity in the tire radial direction. The ratio (E 1 / E 2 ) to the rate E 2 is required to be 1.2 or more. If the values of E 1 and E 1 / E 2 are lower than the above values, a sufficient effect of both riding comfort and run flat durability cannot be obtained. In this respect, E 1 is more preferably 10 MPa or more, particularly preferably 15 MPa or more, and E 1 / E 2 is preferably 1.7 or more.
The dynamic moduli E 1 and E 2 are values measured under conditions of 150 ° C. and 1% strain.

前記サイド補強ゴム層に用いられるゴム成分としては、ジエン系ゴムが好ましく用いられる。ジエン系ゴムとしては天然ゴム及びジエン系合成ゴムが挙げられ、ジエン系合成ゴムとしては、例えばスチレン−ブタジエン共重合体(SBR),ポリブタジエン(BR),ポリイソプレン(IR)及びこれらの混合物などが挙げられる。
前記短繊維の材質としては、有機繊維及び無機繊維のいずれでもよいが融点200℃以上、更に融点は高いものほど好ましく、特に融解しないものが好ましい。一般にランフラット走行時に、サイド補強ゴム層は、温度上昇が最も大きい部位の一つであり、低融点の材質を用いると融解してサイド補強ゴム層内で破壊核となり、ランフラット耐久性を著しく低下させることがあるが、融点200℃以上の繊維を用いることにより、そのような破壊核の発生を抑制してランフラット耐久性を向上させることができる。
前記短繊維は、例えば綿、レーヨン、セルロース等の天然高分子繊維;脂肪族ポリアミド、芳春族ポリアミド、ポリエステル、ポリビニルアルコール、ポリイミド、脂肪族ポリケトン、炭素繊維等の合成有機高分子繊維;ガラス繊維等の無機繊維等が挙げられ、これらの中から選択される1種又は複数種の繊維を混合して用いることができる。これらの中でも、高温における弾性率が高く、タイヤのランフラット耐久性の向上効果が大きい点から芳香族ポリアミド(融点400〜570℃)が好ましい。
As the rubber component used for the side reinforcing rubber layer, a diene rubber is preferably used. Examples of the diene rubber include natural rubber and diene synthetic rubber. Examples of the diene synthetic rubber include styrene-butadiene copolymer (SBR), polybutadiene (BR), polyisoprene (IR), and mixtures thereof. Can be mentioned.
The material of the short fiber may be either an organic fiber or an inorganic fiber, but a material having a melting point of 200 ° C. or higher and a higher melting point is preferable, and a material that does not melt is particularly preferable. In general, during run-flat running, the side reinforcing rubber layer is one of the parts where the temperature rises the most. When a low melting point material is used, the side reinforcing rubber layer melts and becomes a fracture nucleus in the side reinforcing rubber layer. Although it may be lowered, the use of fibers having a melting point of 200 ° C. or higher can suppress the generation of such fracture nuclei and improve the run-flat durability.
The short fiber is, for example, a natural polymer fiber such as cotton, rayon, or cellulose; a synthetic organic polymer fiber such as aliphatic polyamide, Yoshiharu polyamide, polyester, polyvinyl alcohol, polyimide, aliphatic polyketone, or carbon fiber; glass fiber or the like. Inorganic fibers can be used, and one or more kinds of fibers selected from these can be mixed and used. Among these, aromatic polyamide (melting point: 400 to 570 ° C.) is preferable because it has a high elastic modulus at a high temperature and has a large effect of improving the run-flat durability of the tire.

前記短繊維は、繊維径が0.1〜20.0dtexであることが好ましく、3.0〜10.0dtexであることが更に好ましい。0.1dtex以上とすることにより、短繊維の本数を抑えることができゴム成分中の分散が容易となり、短繊維が破壊核となることによるゴム破壊特性の低下が抑制され、一方、20.0dtex以下とすることにより、アスペクト比が大きい短繊維配合によるゴム異方性の発現が容易となる。   The short fiber preferably has a fiber diameter of 0.1 to 20.0 dtex, and more preferably 3.0 to 10.0 dtex. By setting it to 0.1 dtex or more, the number of short fibers can be suppressed, dispersion in the rubber component is facilitated, and the deterioration of rubber breaking properties due to the short fibers becoming fracture nuclei is suppressed, while 20.0 dtex. By making it below, it becomes easy to develop rubber anisotropy by blending short fibers having a large aspect ratio.

また、前記短織椎は、繊維長が0.5〜5.0mmであることが好ましく、1.0〜2.0mmであることが更に好ましい。0.5mm以上とすることで、カット時の歩留性が得られ経済的であり、アスペクト比も大きく短繊維の異方性が発現しやすく、一方、5.0mm以下とすることで、配合時のゴム分散性の容易となる。   The short weave vertebra preferably has a fiber length of 0.5 to 5.0 mm, more preferably 1.0 to 2.0 mm. By making it 0.5 mm or more, the yield at the time of cutting is obtained and economical, the aspect ratio is large and the anisotropy of short fibers is easy to develop, while by making it 5.0 mm or less, it is blended The rubber dispersibility at the time becomes easy.

さらに、短繊維は、後述する方法で測定される熱収縮率が0.0〜5.0%の範囲であることが好ましく、0.0〜1.0%であることが更に好ましい。5.0%以下とすることで、配合時のゴムの温度上昇による短繊維の収縮や湾曲、短繊維同士の絡まりなどがなく分散性は良好であり、短繊維とゴム成分との接着性も向上する。   Further, the short fiber preferably has a heat shrinkage ratio measured by the method described later in the range of 0.0 to 5.0%, and more preferably 0.0 to 1.0%. By setting the content to 5.0% or less, there is no shrinkage or bending of the short fibers due to the temperature rise of the rubber during compounding, and there is no entanglement between the short fibers, and the dispersibility is good, and the adhesion between the short fibers and the rubber component is also good improves.

また、一般にサイド補強ゴム層は、ランフラット時の変形が大きいために、短繊維とゴムは強固に接着していることが好ましい。接着が強固であれば、ゴムと短繊維間の摩擦が減り、補強ゴム部位の発熱が低減し破壊核となることを抑制する効果もある。このため、接着処理法としては、公知の方法を用いることができ、通常のタイヤコード(カーカスプライ材やベルト補強層などのコード)とゴムとの接着に用いられる処理液、例えばレゾルシン−ホルムアルデヒド-ラテックス(RFL)接着処理液に浸漬した後、熱処理を加えるディップ処理する方法が性能や経済面より好ましい。この際、長繊維にディップ処理を施した後、所定の長さに切断して、所望の短繊維を得ることもできる。
前記サイド補強ゴム層においては、ゴム成分100質量部に対して短繊維0.2〜5.0質量部を配合してなるのが好ましく、更に0.5〜3.0質量部を配合してなるのが好ましい。0.2質量部以上とすることでタイヤ周方向に充分な弾性率が容易に得られ、3.0質量部以下とすることで分散性よく、優れたランフラット耐久性を得ることが容易となる。
In general, since the side reinforcing rubber layer is largely deformed during run flat, it is preferable that the short fibers and the rubber are firmly bonded. If the adhesion is strong, the friction between the rubber and the short fiber is reduced, and there is an effect of suppressing the heat generation at the reinforcing rubber portion and becoming a fracture nucleus. For this reason, a known method can be used as an adhesion treatment method, and a treatment liquid used for adhesion between a normal tire cord (cord such as a carcass ply material and a belt reinforcing layer) and rubber, for example, resorcin-formaldehyde- A dipping process in which heat treatment is performed after immersion in a latex (RFL) adhesion treatment liquid is preferred from the viewpoint of performance and economy. At this time, after applying a dip treatment to the long fibers, they can be cut to a predetermined length to obtain desired short fibers.
In the side reinforcing rubber layer, it is preferable to mix 0.2 to 5.0 parts by mass of short fibers with respect to 100 parts by mass of the rubber component, and further 0.5 to 3.0 parts by mass. Preferably it is. By setting it to 0.2 parts by mass or more, a sufficient elastic modulus in the tire circumferential direction can be easily obtained, and by setting it to 3.0 parts by mass or less, it is easy to obtain excellent run flat durability. Become.

次に、図を参照しながら本発明を更に説明する。
図1は、本発明における乗用車用ランフラットタイヤの一実施態様の左半分断面図であり、一対のビード部1及び一対の両サイドウォール部2に連なるトレッド部3とを有し、上記一対のビード部1間にトロイド状に延在してこれら各部1,2,3を補強するカーカス層(ラジアルカーカス)4と、上記サイドウォール部2の上記ラジアルカーカス4の内側に配置した一対のサイド補強ゴム層5とを備える。
また、ラジアルカーカス4は、上記一対のビード部1にそれぞれ埋設されたビードコア6間にトロイド状に延びる本体部と、ビードコア6の周りでタイヤ幅方向内側から外側に向けて半径方向外方に巻上げた折り返し部を有し、上記ビードコアのタイヤ半径方向外側には、ビードフィラー7が配置されている。
Next, the present invention will be further described with reference to the drawings.
FIG. 1 is a left half sectional view of an embodiment of a passenger car run flat tire according to the present invention, which has a pair of bead portions 1 and a tread portion 3 connected to a pair of sidewall portions 2, A carcass layer (radial carcass) 4 that extends in a toroidal shape between the bead portions 1 and reinforces these portions 1, 2, and 3, and a pair of side reinforcements disposed inside the radial carcass 4 of the sidewall portion 2. And a rubber layer 5.
Further, the radial carcass 4 is wound radially outwardly from the inner side to the outer side in the tire width direction around the bead core 6 and a main body part extending in a toroidal shape between the bead cores 6 embedded in the pair of bead parts 1. A bead filler 7 is disposed outside the bead core in the tire radial direction.

サイド補強ゴム層5は短繊維含有ゴムからなり、断面が三日月形状のものである。ここで、「断面が三日月形状」とは広義に解され、規則正しい形状、不規則な形状の三日月形断面だけでなく、例えば弓型断面なども包含される。
また、上記カーカス層4のクラウン部のタイヤ半径方向外側には二枚のベルト層からなるベルト8が配置されていることに加え、該ベルト8のタイヤ半径方向外側でベルト端部を覆うようにベルト補強層9が配置されている。ここで、ベルト層は、通常、タイヤ赤道面に対して傾斜して延びるコードのゴム引き層からなり、2枚のベルト層は、該ベルト層を構成するコードが互いに赤道面を挟んで交差するように積層されてベルト8を構成する。ベルト補強層9は、少なくともベルト端部を覆ってベルト全面又は一部に配設され、通常、タイヤ周方向に対し実質的に平行に配列したコードのゴム引き層からなる。
The side reinforcing rubber layer 5 is made of short fiber-containing rubber and has a crescent-shaped cross section. Here, the “cross section is crescent-shaped” is understood in a broad sense, and includes not only regular and irregular crescent-shaped sections, but also, for example, arcuate sections.
Further, in addition to the belt 8 consisting of two belt layers being arranged on the outer side in the tire radial direction of the crown portion of the carcass layer 4, the belt end is covered on the outer side in the tire radial direction of the belt 8. A belt reinforcing layer 9 is disposed. Here, the belt layer is usually composed of a rubberized layer of a cord extending obliquely with respect to the tire equatorial plane. In the two belt layers, the cords constituting the belt layer intersect with each other with the equator plane interposed therebetween. The belt 8 is thus laminated. The belt reinforcing layer 9 is disposed on the entire belt surface or a part thereof so as to cover at least the belt end portion, and is usually formed of a rubberized layer of a cord arranged substantially parallel to the tire circumferential direction.

なお、図1に示すランフラットタイヤのカーカス層4は、1枚のカーカスプライからなるが、本発明のランフラットタイヤにおいては、カーカス層(ラジアルカーカス)4を構成するカーカスプライの数はこれに限られるものではなく、2枚以上であってもよく、また、その構造も特に限定されるものではない。また、図1中のベルト8は、二枚のベルト層からなるが、本発明のランフラットタイヤにおいては、ベルト8を構成するベルト層の枚数もこれに限られるものではない。   The carcass layer 4 of the run-flat tire shown in FIG. 1 is composed of one carcass ply. In the run-flat tire of the present invention, the number of carcass plies constituting the carcass layer (radial carcass) 4 is the same. It is not limited, Two or more sheets may be sufficient, and the structure is not particularly limited. The belt 8 in FIG. 1 includes two belt layers. However, in the run flat tire of the present invention, the number of belt layers constituting the belt 8 is not limited to this.

本発明における前記サイド補強ゴム層の短繊維含有ゴムには、前記成分の他に、ゴム工業界で通常使用される配合剤、例えば充填剤、老化防止剤、加硫剤、加硫助剤、加硫促進剤等を、本発明の目的を害しない範囲内で適宜選択して配合して、混練り、熱入れ、押出等することにより製造することができる。このようにして得られる短繊維含有ゴムは、通常、短繊維が押出し方向に沿った方向に配向しているため、例えば、短繊維含有ゴムの生タイヤへの貼り付けにおいて、ゴム中の短繊維の配向方向がタイヤ周方向になるように貼り付けることができる。   In the short fiber-containing rubber of the side reinforcing rubber layer in the present invention, in addition to the above components, compounding agents usually used in the rubber industry, such as fillers, anti-aging agents, vulcanizing agents, vulcanizing aids, Vulcanization accelerators and the like can be produced by appropriately selecting and blending them within a range that does not impair the object of the present invention, and kneading, heating, extruding, and the like. Since the short fiber-containing rubber thus obtained is usually oriented in the direction along the extrusion direction, the short fiber in the rubber is, for example, affixed to the raw tire of the short fiber-containing rubber. Can be attached so that the orientation direction of the tire becomes the circumferential direction of the tire.

次に、本発明を実施例によりさらに詳細に説明するが、本発明は、これらの例によってなんら限定されるものではない。
各種測定は、下記の方法に従って行なった。
(1)コードの熱収縮率(%)
ディップ処理コードに50gの重りを掛け、予め177℃に保たれたオーブン中に、30分放置し、オーブン放置の前後のコードの長さの差を、オーブンに入れる前のコード長で除して求めた。
(2)サイド補強ゴム層のタイヤ周方向及びタイヤ径方向の動的弾性率(E')
供試タイヤからサイド補強ゴム層を切り出し、スライサーにて1mm程度の厚さにした後、動的粘弾性測定装置でタイヤ周方向及びタイヤ径方向(ラジアル方向)の動的弾性率をそれぞれ測定した。なお、測定条件は、歪み:1%、周波数:50Hz、温度:150℃である。
EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
Various measurements were performed according to the following methods.
(1) Thermal contraction rate of cord (%)
Apply a 50g weight to the dip treated cord and leave it in an oven previously maintained at 177 ° C for 30 minutes. Divide the difference in cord length before and after leaving the oven by the cord length before entering the oven. Asked.
(2) Dynamic elastic modulus (E ′) in the tire circumferential direction and tire radial direction of the side reinforcing rubber layer
After the side reinforcing rubber layer was cut out from the test tire and made a thickness of about 1 mm with a slicer, the dynamic elastic modulus in the tire circumferential direction and the tire radial direction (radial direction) was measured with a dynamic viscoelasticity measuring device. . Measurement conditions are strain: 1%, frequency: 50 Hz, temperature: 150 ° C.

(3)内圧充填時のタイヤの縦バネ定数(乗り心地性)
JATMAに準拠したリムでリム組みし、準拠規格の空気圧に調整し、次に、タイヤを負荷装置(静特性試験機アムスラー)に取り付けた。タイヤの直径方向の変化量が50mm/minとなる速度で垂直荷重を負荷していき、荷重に対する縦たわみを測定し、回帰式においてある荷重値での微分により縦バネ定数(N/mm)を求めた。タイヤの縦バネ定数は比較例1のタイヤを100として指数表示した。指数値が小さい程、タイヤの縦バネが小さく、乗り心地性に優れることを示す。
(4)ランフラット耐久性
供試タイヤを実車に装着し、内圧0の状態で走行させて、故障発生に至るまでの走行距離を測定し、比較例1のタイヤの走行距離を100として、指数表示した。指数値が大きい程、故障発生に至るまでの走行距離が長く、ランフラット耐久性に優れることを示す。
(3) Longitudinal spring constant of tire during internal pressure filling (riding comfort)
The rim was assembled with a rim conforming to JATMA, adjusted to a compliant air pressure, and then the tire was mounted on a load device (static characteristic testing machine Amsler). A vertical load is applied at a speed where the amount of change in the diameter direction of the tire is 50 mm / min, the vertical deflection with respect to the load is measured, and the vertical spring constant (N / mm) is determined by differentiation at a certain load value in the regression equation. Asked. The longitudinal spring constant of the tire was indicated as an index with the tire of Comparative Example 1 as 100. The smaller the index value, the smaller the vertical spring of the tire, and the better the ride comfort.
(4) Run-flat durability The test tire is mounted on an actual vehicle, traveled in a state where the internal pressure is zero, the travel distance until failure occurs is measured, and the travel distance of the tire of Comparative Example 1 is taken as 100. displayed. The larger the index value, the longer the distance traveled until the failure occurs, indicating better run-flat durability.

実施例1,2及び比較例1,2
<サイド補強ゴム層組成物の調製>
天然ゴム25質量部、ブタジエンゴム(シス−1,4−ポリブタジエン)75質量部からなるゴム成分100質量部に対して、第1表に示す種類と量の短繊維及び配合剤を配合してゴム組成物を調製した。なお、短繊維としては、材質がアラミドであり、繊維径1.67dtex、繊維長が1mm、熱収縮率が0.0%であり、ディップ処理を施したものを用いた。また、短繊維量はゴム成分100質量部に対して、実施例1では2.0質量部、実施例2では3.0質量部とし、比較例1,2では短繊維は配合しなかった。
Examples 1 and 2 and Comparative Examples 1 and 2
<Preparation of side reinforcing rubber layer composition>
A rubber component containing 100 parts by mass of a rubber component consisting of 25 parts by mass of natural rubber and 75 parts by mass of butadiene rubber (cis-1,4-polybutadiene) is blended with the types and amounts of short fibers and compounding agents shown in Table 1. A composition was prepared. In addition, as a short fiber, the material was aramid, the fiber diameter was 1.67 dtex, the fiber length was 1 mm, the heat shrinkage rate was 0.0%, and the thing which performed the dipping process was used. The amount of short fibers was 2.0 parts by mass in Example 1 and 3.0 parts by mass in Example 2 with respect to 100 parts by mass of the rubber component, and no short fibers were blended in Comparative Examples 1 and 2.

Figure 2006192927
Figure 2006192927

(注)
*1 ブタジエンゴム:「BR01」(商品名、ジェイエスアール(株)製、シス1,4ポリブタジエン)
*2 カーボンブラック:FEF
*3 軟化剤:スピンドルオイル
*4 老化防止剤:ノクラック6C(商品名、大内新興化学工業(株)製)
*5 加硫促進剤:ノクセラーNS(商品名、大内新興化学工業(株)製)
*6 フェノール樹脂:PR−50235(商品名、住友ベークライト(株)製)
*7 硬化剤:ノクセラーH(商品名、大内新興化学工業(株)製)
<供試タイヤの製造及び評価>
サイド補強ゴム層を異にする乗用車用(タイヤサイズ215/45ZR17)ランフラットタイヤを、第2表に従って常法により製造した。このタイヤのサイド補強ゴム層の最大厚さは、実施例1及び比較例1,2では7.5mm、実施例2では6.7mmとした。
得られた各タイヤの重量を測定し、比較例1のタイヤの重量を100として、指数表示した(指数値が小さい程、タイヤの重量が軽く、良好であることを示す)。また、該タイヤに対し、前記方法で、サイド補強ゴム層についてのタイヤ周方向動的弾性率、タイヤ周方向とタイヤ径方向の動的弾性率の比、内圧充填時のタイヤの縦バネ定数、及びランフラット耐久性を測定した。結果を第2表に示す。
(note)
* 1 Butadiene rubber: “BR01” (trade name, manufactured by JSR Corporation, cis 1,4 polybutadiene)
* 2 Carbon black: FEF
* 3 Softener: Spindle oil
* 4 Anti-aging agent: NOCRACK 6C (trade name, manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.)
* 5 Vulcanization accelerator: Noxeller NS (trade name, manufactured by Ouchi Shinsei Chemical Co., Ltd.)
* 6 Phenolic resin: PR-50235 (trade name, manufactured by Sumitomo Bakelite Co., Ltd.)
* 7 Curing agent: Noxeller H (trade name, manufactured by Ouchi Shinsei Chemical Co., Ltd.)
<Manufacture and evaluation of test tires>
A run-flat tire for a passenger car (tire size 215 / 45ZR17) having a different side reinforcing rubber layer was manufactured in accordance with Table 2 by a conventional method. The maximum thickness of the side reinforcing rubber layer of this tire was 7.5 mm in Example 1 and Comparative Examples 1 and 2, and 6.7 mm in Example 2.
The weight of each of the obtained tires was measured, and an index was displayed with the weight of the tire of Comparative Example 1 being 100 (the smaller the index value, the lighter and better the tire weight). Further, for the tire, by the above method, the tire circumferential dynamic elastic modulus for the side reinforcing rubber layer, the ratio of the dynamic elastic modulus in the tire circumferential direction and the tire radial direction, the longitudinal spring constant of the tire during internal pressure filling, And run flat durability was measured. The results are shown in Table 2.

Figure 2006192927
Figure 2006192927

(注)
*8 phr:ゴム成分100質量部当たりの配合質量部数
上記の結果、実施例1と比較例1(従来例)のタイヤを比べれば、本発明における実施例1のタイヤは、乗り心地性(縦バネ定数)については従来のレべルをほぼ維持したままでランフラット耐久性が著しく向上していることが認められる。また、実施例2のタイヤは、サイド補強ゴム層の最大厚さを薄くしタイヤ重量を軽減したタイヤであり、比較例1に比べれば、乗り心地性(縦バネ定数)及びランフラット耐久性の双方で優れた性能が得られていることが認められる。
(note)
* 8 phr: Compounding mass parts per 100 parts by mass of rubber component As a result, comparing the tires of Example 1 and Comparative Example 1 (conventional example), the tire of Example 1 in the present invention has a ride comfort (longitudinal). Regarding the spring constant), it is recognized that the run-flat durability is remarkably improved while maintaining the conventional level. Further, the tire of Example 2 is a tire in which the maximum thickness of the side reinforcing rubber layer is reduced and the tire weight is reduced. Compared with Comparative Example 1, the ride comfort (longitudinal spring constant) and run flat durability are improved. It is recognized that excellent performance is obtained in both cases.

なお、比較例2は、短繊維は配合せず、充填剤などの配合量を調整してタイヤ周方向弾性率を実施例1のタイヤとほほ同程度にしたタイヤであるが、ゴムの異方性が殆ど得られないために、縦バネ定数は大きくなり乗り心地性は非常に悪化している。また、一般にカーボンブラックや樹脂を配合して動的弾性率E'を大きくすれば繰り返し変形時のゴムの発熱が大きくなるため、タイヤ周方向のE'を大きくすればランフラット耐久性の向上効果は大幅に低下することとなるが、このことは実施例1と比較例2との比較から明らかである。   Comparative Example 2 is a tire in which the short fiber is not blended and the blending amount of the filler and the like is adjusted so that the tire circumferential elastic modulus is approximately the same as that of the tire of Example 1, but the rubber anisotropy. Is hardly obtained, the longitudinal spring constant is increased, and the ride comfort is very deteriorated. In general, increasing the dynamic elastic modulus E ′ by compounding carbon black or resin increases the heat generation of the rubber during repeated deformation, so increasing the tire circumferential direction E ′ increases the run-flat durability. However, this is clear from the comparison between Example 1 and Comparative Example 2.

本発明の乗用車用ランフラットタイヤは、通常走行における乗り心地性とランフラット耐久性の双方の性能を大幅に向上させることができる。   The run-flat tire for passenger cars of the present invention can greatly improve both the ride comfort and the run-flat durability in normal running.

本発明の乗用車用ランフラットタイヤの一例を示す左半断面図である。It is a left half sectional view showing an example of a run flat tire for passenger cars of the present invention.

符号の説明Explanation of symbols

1:ビード部
2:サイドウォール部
3:トレッド部
4:カーカス層
5:サイド補強ゴム層
6:ビードコア
7:ビードフィラー
8:ベルト
9:ベルト補強層
1: Bead part 2: Side wall part 3: Tread part 4: Carcass layer 5: Side reinforcing rubber layer 6: Bead core 7: Bead filler 8: Belt 9: Belt reinforcing layer

Claims (8)

カーカス層と、該カーカス層の外側に順次配置されたベルト、ベルト補強層及びトレッド部とを有し、該トレッド部の左右に配置された一対のサイドウォール部に断面が三日月状のサイド補強ゴム層を具備してなるランフラットタイヤであって、前記サイド補強ゴム層が、短繊維をタイヤ周方向に配向させたゴム組成物からなり、かつ150℃,歪み1%で測定したときのタイヤ周方向動的弾性率をE1、タイヤ径方向動的弾性率をE2としたとき、E1が5MPa以上であると共に、E1/E2が1.2以上の値であることを特徴とする乗用車用ランフラットタイヤ。 A side reinforcing rubber having a carcass layer, a belt sequentially disposed outside the carcass layer, a belt reinforcing layer, and a tread portion, and having a crescent-shaped cross section in a pair of side wall portions disposed on the left and right sides of the tread portion A run-flat tire comprising a layer, wherein the side reinforcing rubber layer is made of a rubber composition in which short fibers are oriented in the tire circumferential direction, and the tire circumference is measured at 150 ° C. and a strain of 1%. When the directional dynamic modulus is E 1 and the tire radial dynamic modulus is E 2 , E 1 is 5 MPa or more and E 1 / E 2 is a value of 1.2 or more. Run-flat tires for passenger cars. サイド補強ゴム層のゴム成分が、天然ゴム及び合成ジエン系ゴムから選ばれた少なくとも一種のゴムである請求項1記載の乗用車用ランフラットタイヤ。 The run-flat tire for passenger cars according to claim 1, wherein the rubber component of the side reinforcing rubber layer is at least one rubber selected from natural rubber and synthetic diene rubber. 短繊維の繊維径が0.10〜20.0dtexである請求項1又は2に記載の乗用車用ランフラットタイヤ。 The run-flat tire for passenger cars according to claim 1 or 2, wherein the fiber diameter of the short fibers is 0.10 to 20.0 dtex. 短繊維の繊維長が0.5〜5.0mmである請求項1〜3のいずれかに記載の乗用車用ランフラットタイヤ。 The run-flat tire for a passenger car according to any one of claims 1 to 3, wherein the short fiber has a fiber length of 0.5 to 5.0 mm. 短繊維の熱収縮率が0.0〜5.0%である請求項1〜4のいずれかに記載の乗用車用ランフラットタイヤ。 The run-flat tire for a passenger car according to any one of claims 1 to 4, wherein the heat shrinkage ratio of the short fibers is 0.0 to 5.0%. 短繊維の融点が200℃以上のものである請求項1〜5のいずれかに記載の乗用車用ランフラットタイヤ。 The run-flat tire for a passenger car according to any one of claims 1 to 5, wherein the short fiber has a melting point of 200 ° C or higher. サイド補強ゴム層が、ゴム成分100質量部に対して短繊維を0.2〜5.0質量部配合したゴム組成物からなる請求項1〜6のいずれかに記載の乗用車用ランフラットタイヤ。 The run-flat tire for a passenger car according to any one of claims 1 to 6, wherein the side reinforcing rubber layer is made of a rubber composition in which 0.2 to 5.0 parts by mass of a short fiber is blended with 100 parts by mass of the rubber component. 短繊維が、ゴムとの接着のために表面処理されたものである請求項1〜7のいずれかに記載の乗用車用ランフラットタイヤ。





The run-flat tire for passenger cars according to any one of claims 1 to 7, wherein the short fibers are surface-treated for adhesion to rubber.





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