JP2005350023A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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Publication number
JP2005350023A
JP2005350023A JP2004175757A JP2004175757A JP2005350023A JP 2005350023 A JP2005350023 A JP 2005350023A JP 2004175757 A JP2004175757 A JP 2004175757A JP 2004175757 A JP2004175757 A JP 2004175757A JP 2005350023 A JP2005350023 A JP 2005350023A
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Prior art keywords
belt
circumferential
circumferential belt
pneumatic tire
ribbon material
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JP2004175757A
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JP4514111B2 (en
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Yoshihide Kono
好秀 河野
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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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
    • B60C2009/2219—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre with a partial zero degree ply at the belt edges - edge band

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  • Tires In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a reinforcement element of a circumferential belt from being cut in load loading rolling. <P>SOLUTION: The pneumatic tire is provided with a carcass 1; inclination belts 3, 4 of two layers extending between a crown part of the carcass 1 and a tread part 2 while inclined to a tire equator plane; a circumferential belt 7 arranged between the carcass 1 and the inclination belt 3 and formed by winding once or a plurality of times a ribbon material 6 having the reinforcement element 5 substantially parallel to the equator plane; and an auxiliary circumferential belt 10 arranged between an end of the inclination belt 3 and the tread part and formed by winding once or a plurality of times the ribbon material 9 having the reinforcement element 8 substantially parallel to the equator plane. Since tension is shared by the auxiliary circumferential belt 10 at both ends of the circumferential belt 7 applied with the largest tension at the load loading rolling, cutting of the reinforcement element 5 can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、トラック及びバス用タイヤ、或いは鉱山車両用タイヤのような重荷重用の空気入りタイヤに関し、特に補強素子を有する周方向ベルトの耐久性を向上させた空気入りタイヤに関する。   The present invention relates to heavy duty pneumatic tires such as truck and bus tires or mining vehicle tires, and more particularly to a pneumatic tire with improved durability of a circumferential belt having reinforcing elements.

傾斜ベルト層を備えた重荷重用の空気入りタイヤにおいては、充填される内圧、タイヤにかかる重荷重、及び特に高速回転の遠心力による作用で、そのベルトにタイヤ周方向の大きな張力がかかり、ベルト径が拡大する。傾斜ベルトのスチールコードは赤道面に対して１５〜２５°程度の鋭角で交差しているため、ベルト径の拡大により、タイヤ幅方向の両端部において傾斜ベルト層間及び最外層の傾斜ベルト層とトレッド部との間に大きな剪断歪みが生じ、故障に至ることがある。   In a heavy-duty pneumatic tire having an inclined belt layer, a large tension in the tire circumferential direction is applied to the belt due to the internal pressure to be filled, the heavy load applied to the tire, and particularly the centrifugal force of high-speed rotation. The diameter increases. Since the steel cord of the inclined belt intersects the equator plane at an acute angle of about 15 to 25 °, the belt diameter increases and the inclined belt layer and the outermost inclined belt layer and the tread are formed at both ends in the tire width direction. A large shear strain may occur between the two parts, leading to failure.

そこで、トレッド部と傾斜ベルト層の間に、実質的にタイヤ周方向に延在する波状スチールコード又はスチールフィラメントからなる補強素子を備えた周方向ベルトを設けた重荷重用空気入りタイヤが提案されている。このタイヤによれば、内圧充填時及び負荷転動時における傾斜ベルト層のベルト径の拡大を抑制して、傾斜ベルト層の耐久性を高めることができるとされる（特許文献１参照）。   Therefore, a heavy duty pneumatic tire is proposed in which a circumferential belt provided with a reinforcing element made of a wavy steel cord or a steel filament extending substantially in the tire circumferential direction is provided between the tread portion and the inclined belt layer. Yes. According to this tire, it is supposed that the durability of the inclined belt layer can be improved by suppressing the belt diameter of the inclined belt layer from being increased during internal pressure filling and load rolling (see Patent Document 1).

特開平２−８１７０６号公報JP-A-2-81706

しかしながら、この重荷重用空気入りラジアルタイヤでは、周方向ベルトが、内圧充填時に発生する張力を殆ど負担し、荷重負荷転動時には、周方向ベルトの幅方向の端部の補強素子に最も大きな張力が加わるため、その補強素子が破断してしまうことがある。
また、傾斜ベルト層が、タイヤ周方向に比較的大きな伸長性を有することに起因して、荷重負荷転動時には、周方向ベルトと傾斜ベルト層との間のタイヤ周方向剪断歪みが、タイヤ幅方向端部で最も大きくなるため、その部分で周方向ベルトと傾斜ベルト層にセパレーションが発生し、タイヤの耐久性が低下することがある。 However, in this heavy-duty pneumatic radial tire, the circumferential belt bears almost all of the tension generated when filling with internal pressure, and the maximum tension is applied to the reinforcing element at the end in the width direction of the circumferential belt during rolling under load. In addition, the reinforcing element may break.
In addition, due to the inclined belt layer having a relatively large extensibility in the tire circumferential direction, the tire circumferential shear strain between the circumferential belt and the inclined belt layer is caused by the tire width during rolling under load. Since it becomes the largest at the end portion in the direction, separation may occur in the circumferential belt and the inclined belt layer at that portion, which may reduce the durability of the tire.

本発明は、このような問題を解決するためになされたものであり、その第１の目的は、周方向ベルトの補強素子が荷重負荷転動時に破断されるのを防止することである。
また、第２の目的は、荷重負荷転動時に、周方向ベルトと傾斜ベルト層のセパレーションを防止することである。 The present invention has been made to solve such a problem, and a first object of the present invention is to prevent the reinforcing element of the circumferential belt from being broken at the time of load rolling.
A second object is to prevent separation between the circumferential belt and the inclined belt layer during rolling under load.

請求項１に係る発明は、カーカスと、前記カーカスのタイヤ半径方向外側に配置された傾斜ベルト層と、補強素子を有するリボン材を赤道面に実質的に平行に巻いて形成した周方向ベルトと、前記周方向ベルトの端部のタイヤ幅方向外側に配置された補強ベルトとを備えたことを特徴とする空気入りタイヤである。
請求項２に係る発明は、請求項１記載の空気入りタイヤにおいて、前記補強ベルトは、補強素子を有するリボン材を赤道面に実質的に平行に巻いて形成したものであることを特徴とする空気入りタイヤである。
請求項３に係る発明は、請求項１記載の空気入りタイヤにおいて、前記補強ベルトは、１枚の傾斜ベルトのみと重なり合う位置に配置されていることを特徴とする空気入りタイヤである。
請求項４に係る発明は、請求項１記載の空気入りタイヤにおいて、最も幅の広い傾斜ベルトの半径方向外側に前記補強ベルトが配置され、前記半径方向の内側に前記周方向ベルトが配置されていることを特徴とする空気入りタイヤである。
請求項５に係る発明は、請求項２記載の空気入りタイヤにおいて、前記周方向ベルトの補強素子はスチールコード又はスチールフィラメントからなり、前記補強ベルトの補強素子は有機繊維からなることを特徴とする空気入りタイヤである。
請求項６に係る発明は、請求項２記載の空気入りタイヤにおいて、前記補強ベルトを構成するリボン材の破断伸びは、前記周方向ベルトを構成するリボン材の破断伸びよりも０．５％以上大きいことを特徴とする空気入りタイヤである。 The invention according to claim 1 is a carcass, an inclined belt layer disposed on the outer side in the tire radial direction of the carcass, and a circumferential belt formed by winding a ribbon material having a reinforcing element substantially parallel to the equator plane. A pneumatic tire comprising a reinforcing belt disposed on the outer side in the tire width direction at the end of the circumferential belt.
The invention according to claim 2 is the pneumatic tire according to claim 1, wherein the reinforcing belt is formed by winding a ribbon material having a reinforcing element substantially parallel to the equator plane. It is a pneumatic tire.
The invention according to claim 3 is the pneumatic tire according to claim 1, wherein the reinforcing belt is disposed at a position overlapping only one inclined belt.
According to a fourth aspect of the present invention, in the pneumatic tire according to the first aspect, the reinforcing belt is disposed on the radially outer side of the widest inclined belt, and the circumferential belt is disposed on the inner side of the radial direction. This is a pneumatic tire.
The invention according to claim 5 is the pneumatic tire according to claim 2, wherein the reinforcing element of the circumferential belt is made of a steel cord or a steel filament, and the reinforcing element of the reinforcing belt is made of an organic fiber. It is a pneumatic tire.
The invention according to claim 6 is the pneumatic tire according to claim 2, wherein the breaking elongation of the ribbon material constituting the reinforcing belt is 0.5% or more than the breaking elongation of the ribbon material constituting the circumferential belt. It is a pneumatic tire characterized by being large.

本発明によれば、荷重負荷転動時に最も大きな張力がかかる周方向ベルトの端部の補強素子の張力を補強ベルトで分担することで低減するため、周方向ベルトの端部の周方向の伸びが抑えられる。このため、その補強素子の破断が防止できる。また、その補強ベルトにより、周方向ベルトのタイヤ幅方向外側端部と傾斜ベルト層との間の周方向への伸びの差が抑えられるため、周方向ベルトと傾斜ベルト層のセパレーションが防止できる。   According to the present invention, since the tension of the reinforcing element at the end of the circumferential belt to which the greatest tension is applied during rolling under load is reduced by sharing with the reinforcing belt, the circumferential extension of the end of the circumferential belt is reduced. Is suppressed. For this reason, the breakage of the reinforcing element can be prevented. In addition, the reinforcing belt suppresses a difference in circumferential extension between the outer end portion of the circumferential belt in the tire width direction and the inclined belt layer, and therefore separation of the circumferential belt and the inclined belt layer can be prevented.

本発明の実施形態の空気入りタイヤについて、図面を参照して説明する。
〔第１の実施形態〕
図１は本発明に係る空気入りタイヤの第１の実施形態の幅方向の要部断面図（図１（ａ））及び平面図（図１（ｂ））である。この空気入りタイヤは、図示されていない左右一対のビードコア間でトロイド状に延びるカーカス１と、カーカス１のクラウン部とトレッド部２との間に配置され、それぞれ赤道面に対して傾斜した方向に延在するスチールコード又はスチールフィラメントを有する２層の傾斜ベルト３，４と、カーカス１と傾斜ベルト３との間に配置され、補強素子５を有するリボン材６を赤道面に実質的に平行に２回巻いて形成した周方向ベルト７と、傾斜ベルト３の端部とトレッド部２との間に配置され、補強素子８を有するリボン材９を赤道面に実質的に平行に２回巻いて形成した補助周方向ベルト（補強ベルト）１０とを備えている。なお、周方向ベルト７を構成するリボン材６の巻き数は１回でもよいし、３回以上でもよい。また、周方向ベルト７を２枚以上設けてもよい。 A pneumatic tire according to an embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a cross-sectional view (FIG. 1 (a)) and a plan view (FIG. 1 (b)) of the width direction of a first embodiment of a pneumatic tire according to the present invention. The pneumatic tire is disposed between a pair of left and right bead cores (not shown) in a toroidal shape, and is disposed between a crown portion and a tread portion 2 of the carcass 1 in directions inclined with respect to the equator plane. Two layers of inclined belts 3 and 4 having steel cords or steel filaments extending, and a ribbon material 6 having reinforcing elements 5 arranged between the carcass 1 and the inclined belt 3 are substantially parallel to the equator plane. A circumferential belt 7 formed by winding twice and a ribbon material 9 disposed between an end of the inclined belt 3 and the tread portion 2 and having a reinforcing element 8 is wound twice substantially parallel to the equator plane. A formed auxiliary circumferential belt (reinforcing belt) 10 is provided. In addition, the winding number of the ribbon material 6 which comprises the circumferential belt 7 may be 1 time, and may be 3 times or more. Two or more circumferential belts 7 may be provided.

周方向ベルト７を構成するリボン材６の補強素子５は、実質的にタイヤ周方向に延在する波状のスチールコード又はスチールフィラメントからなる。補助周方向ベルト１０を構成するリボン材９の補強素子８は、実質的にタイヤ周方向に延在するケブラー（登録商標）、ＰＥＮ（ポリエチレンナフタレート）等のような有機繊維コードからなる。   The reinforcing element 5 of the ribbon material 6 constituting the circumferential belt 7 is made of a wavy steel cord or a steel filament extending substantially in the tire circumferential direction. The reinforcing element 8 of the ribbon material 9 constituting the auxiliary circumferential belt 10 is made of an organic fiber cord such as Kevlar (registered trademark), PEN (polyethylene naphthalate) or the like extending substantially in the tire circumferential direction.

ここで、補助周方向ベルト１０を構成するリボン材９の破断伸びは、周方向ベルト７を構成するリボン材６の破断伸びよりも０．５％以上大きくすることが好ましい。その理由は、補助周方向ベルト１０の幅方向外側の端部は周方向ベルト７の幅方向外側の端部よりもさらに幅方向外側に位置することにより、所謂クラウン径差に起因するリボン材９の周方向伸び量が周方向ベルト７のリボン材６の伸び量より大きくなるため、その分破断伸びが大きくないと、補助周方向ベルト１０を構成するリボン材９の補強素子８が特に周方向伸び量の大きい外側の端部で破断してしまうからである。従って、補助周方向ベルトの１０の補強素子８として、破断伸びを比較的大きくしやすい前述した有機繊維コードを用いることが好ましい。なお、補助周方向ベルトの１０の補強素子８としては有機繊維コードに限らず、スチールコード又はフィラメントを用いることも可能であるが、その場合、補強素子８の形状を周方向コード７を構成するリボン材６の補強素子５と同様の波状にするとともに、その波の振幅を補強素子５の波の振幅よりも大きくすることで、破断伸びを大きくすることが必要である。   Here, it is preferable that the breaking elongation of the ribbon material 9 constituting the auxiliary circumferential belt 10 is 0.5% or more larger than the breaking elongation of the ribbon material 6 constituting the circumferential belt 7. The reason is that the end portion on the outer side in the width direction of the auxiliary circumferential belt 10 is located further on the outer side in the width direction than the end portion on the outer side in the width direction of the circumferential belt 7. Is larger than the amount of elongation of the ribbon material 6 of the circumferential belt 7, the reinforcing element 8 of the ribbon material 9 constituting the auxiliary circumferential belt 10 is particularly circumferential when the elongation at break is not large correspondingly. This is because it breaks at the outer end where the amount of elongation is large. Therefore, it is preferable to use the above-described organic fiber cord that tends to make the elongation at break relatively large as the ten reinforcing elements 8 of the auxiliary circumferential belt. The reinforcing element 8 of the auxiliary circumferential belt 10 is not limited to the organic fiber cord, and a steel cord or a filament can be used. In this case, the reinforcing element 8 is formed in the circumferential cord 7. It is necessary to increase the breaking elongation by making the ribbon material 6 have the same wave shape as that of the reinforcing element 5 and making the amplitude of the wave larger than the amplitude of the wave of the reinforcing element 5.

以上の構成を有する空気入りタイヤによれば、補助周方向ベルト１０を設けたことで、荷重負荷転動時に最も大きな張力がかかる周方向ベルト７の幅方向外側の端部では、補助周方向ベルト１０により張力が分担されるので、長距離走行後においても周方向ベルト７を構成するリボン材６の補強素子５の切れを防止できる。また、補助周方向ベルト１０を設けたことで、周方向ベルト７のタイヤ幅方向外側端部と傾斜ベルト３との間のタイヤ周方向の伸びの差が抑えられる。従って、周方向ベルト７と傾斜ベルト３のセパレーションが防止されるため、空気入りタイヤの耐久性が向上する。   According to the pneumatic tire having the above configuration, the auxiliary circumferential belt 10 is provided at the end on the outer side in the width direction of the circumferential belt 7 to which the greatest tension is applied during rolling under load by providing the auxiliary circumferential belt 10. Since the tension is shared by 10, it is possible to prevent the reinforcing element 5 of the ribbon material 6 constituting the circumferential belt 7 from being cut even after traveling a long distance. Further, by providing the auxiliary circumferential belt 10, the difference in the tire circumferential extension between the outer circumferential end of the circumferential belt 7 and the inclined belt 3 is suppressed. Therefore, since the separation between the circumferential belt 7 and the inclined belt 3 is prevented, the durability of the pneumatic tire is improved.

〔第２の実施形態〕
図２は本発明に係る空気入りタイヤの第２の実施形態の幅方向の要部断面図（図２（ａ））及び平面図（図２（ｂ））である。この図において、図１と同一の部分には図１で使用した符号を付した。 [Second Embodiment]
FIG. 2 is a cross-sectional view (FIG. 2 (a)) and a plan view (FIG. 2 (b)) of the principal part in the width direction of the second embodiment of the pneumatic tire according to the present invention. In this figure, the same parts as those in FIG. 1 are denoted by the reference numerals used in FIG.

本実施形態と第１の実施形態との相違は、補助周方向ベルトの幅及びリボン材の巻き数である。本実施形態では、傾斜ベルト３の端部とトレッド部２との間には、補強素子８を有するリボン材９を赤道面に実質的に平行に１回巻いて形成した補助周方向ベルト１２が配置されている。補助周方向ベルト１２のタイヤ幅方向外側の端は、第１の実施形態と同様、傾斜ベルト３のタイヤ幅方向外側の端部に配置されているが、補助周方向ベルト１２のタイヤ幅方向内側の端は周方向ベルト７のタイヤ幅方向外側の端部と重なり合う位置迄広げられている。このため、第１の実施形態と比較すると、リボン材９の巻き数を半分にしたものの幅を広げたことで同等の補強性能が得られる。   The difference between the present embodiment and the first embodiment is the width of the auxiliary circumferential belt and the number of windings of the ribbon material. In the present embodiment, an auxiliary circumferential belt 12 is formed between the end of the inclined belt 3 and the tread portion 2 by winding the ribbon material 9 having the reinforcing element 8 once substantially parallel to the equator plane. Has been placed. The end on the outer side in the tire width direction of the auxiliary circumferential belt 12 is disposed at the end on the outer side in the tire width direction of the inclined belt 3 as in the first embodiment. Is extended to a position where it overlaps with the outer end of the circumferential belt 7 in the tire width direction. For this reason, compared with 1st Embodiment, the equivalent reinforcement performance is acquired by expanding the width | variety of what halved the winding number of the ribbon material 9. FIG.

〔実施例〕
本実施形態に係る空気入りタイヤの効果を確認するため、以下に説明する４つの実施例、２つの比較例、及び１つの従来例を作成し、走行ドラム条件：空気圧９００kpa、速度６０km/h、荷重５６kNにおいて、５万km走行させた後、タイヤの全周を解剖し、周方向ベルト７の補強素子５の切れ本数をチェックした。 〔Example〕
In order to confirm the effect of the pneumatic tire according to the present embodiment, the following four examples, two comparative examples, and one conventional example are created, and the running drum conditions are: air pressure 900 kpa, speed 60 km / h, After traveling 50,000 km at a load of 56 kN, the entire circumference of the tire was dissected and the number of reinforcing elements 5 of the circumferential belt 7 cut was checked.

（実施例１）
タイヤ：トラック・バス用扁平ラジアルタイヤ（４３５／４５Ｒ２２．５、荷重５６kN）。構造は図１。
周方向ベルト７（第１層）：（幅２０mmのリボン材で幅３００mmに巻く）、波状フィラメントφ０．６mm、振幅３mm、波長３６mm、打ち込み２７本／２０mm、ほぼ０゜、リボン材の破断伸び３％。
周方向ベルト７（第２層）：（幅２０mmのリボン材で幅３００mmに巻く）、波状フィラメントφ０．６mm、振幅3mm 、波長３６mm、打ち込み２７本／２０mm、ほぼ０゜、リボン材の破断伸び３％。
傾斜ベルト３：幅３６０mm、右上がり５２゜、スチールコード１＋６×０．３４、２４本／５０mm
傾斜ベルト４：幅２３０mm、左上がり５２゜、スチールコード１＋６×０．３４、２４本／５０mm
補助周方向ベルト１０：補強素子８はケブラー（登録商標）で１６５０dex/3 の撚り構造。打ち込み８本／１２mm。リボン材９の破断伸び３．５％。この１２mm幅のリボン材９を傾斜ベルト３の端部で２回巻き。
試験結果：全周で切れ箇所なし (Example 1)
Tire: flat radial tire for trucks and buses (435 / 45R22.5, load 56 kN). The structure is shown in FIG.
Circumferential belt 7 (first layer): (wound in a ribbon material having a width of 20 mm to a width of 300 mm), wavy filament φ0.6 mm, amplitude 3 mm, wavelength 36 mm, driving 27/20 mm, almost 0 °, breaking elongation of the ribbon material 3%.
Circumferential belt 7 (second layer): (wound in a ribbon material having a width of 20 mm to a width of 300 mm), wavy filament φ0.6 mm, amplitude 3 mm, wavelength 36 mm, driving 27/20 mm, almost 0 °, elongation at break of the ribbon material 3%.
Inclined belt 3: 360 mm wide, 52 ° upward, steel cord 1 + 6 × 0.34, 24/50 mm
Inclined belt 4: Width 230mm, left upward 52 °, steel cord 1 + 6 × 0.34, 24 / 50mm
Auxiliary circumferential belt 10: The reinforcing element 8 is a kevlar (registered trademark) twisted structure of 1650 dex / 3. Driving 8 pieces / 12mm. The breaking elongation of the ribbon material 9 is 3.5%. The ribbon material 9 having a width of 12 mm is wound twice at the end of the inclined belt 3.
Test results: No breaks around the circumference

（実施例２）
構造は図１。補助周方向ベルト１０の補強素子８はＰＥＮ（ポリエチレンナフタレート）で１６５０dex/2 の撚り構造。打ち込み１２本／１２mm。リボン材９の破断伸び４．５％。この１２mm幅のリボン材９を傾斜ベルト３の端部で２回巻き。その他の諸元は実施例１と同じ。
試験結果：全周で切れ箇所なし (Example 2)
The structure is shown in FIG. The reinforcing element 8 of the auxiliary circumferential belt 10 is PEN (polyethylene naphthalate) and has a twist structure of 1650 dex / 2. Driving 12 pieces / 12mm. The elongation at break of ribbon material 9 is 4.5%. The ribbon material 9 having a width of 12 mm is wound twice at the end of the inclined belt 3. Other specifications are the same as in the first embodiment.
Test results: No breaks around the circumference

（実施例３）
構造は図２。補助周方向ベルト１２の補強素子８はケブラー（登録商標）で１６５０dex/3 の撚り構造。打ち込み８本／１２mm。リボン材９の破断伸び３．５％。この１２mm幅のリボン材９を傾斜ベルト３の端から幅方向内側へ約４０mmの幅となるようにスパイラル巻き。その他の諸元は実施例１と同じ。
試験結果：全周で切れ箇所なし (Example 3)
The structure is shown in FIG. The reinforcing element 8 of the auxiliary circumferential belt 12 is Kevlar (registered trademark) and has a twist structure of 1650 dex / 3. Driving 8 pieces / 12mm. The breaking elongation of the ribbon material 9 is 3.5%. The ribbon material 9 having a width of 12 mm is spirally wound so as to have a width of about 40 mm from the end of the inclined belt 3 to the inner side in the width direction. Other specifications are the same as in the first embodiment.
Test results: No breaks around the circumference

（実施例４）
構造は図１。補助周方向ベルト１２の補強素子８の材質、打ち込み及び波長は周方向ベルト７の補強素子５のものと基本的には同じであるが、リボン材９の破断伸びを３．５％にするために振幅を３．８mmに増加させた。その他の諸元は実施例１と同じ。
試験結果：全周で切れ箇所なし Example 4
The structure is shown in FIG. The material, driving, and wavelength of the reinforcing element 8 of the auxiliary circumferential belt 12 are basically the same as those of the reinforcing element 5 of the circumferential belt 7, but to make the elongation at break of the ribbon material 9 3.5%. The amplitude was increased to 3.8 mm. Other specifications are the same as in the first embodiment.
Test results: No breaks around the circumference

（比較例１）
構造は図１。傾斜ベルト３，４及び周方向ベルト７の諸元は実施例１と同じ。補助周方向ベルト１０の補強素子８の材質、打ち込み及び波長は周方向ベルト７の補強素子５と同じ。
試験結果：周上の３３箇所で切れ発生。 (Comparative Example 1)
The structure is shown in FIG. The specifications of the inclined belts 3 and 4 and the circumferential belt 7 are the same as those in the first embodiment. The material, driving, and wavelength of the reinforcing element 8 of the auxiliary circumferential belt 10 are the same as those of the reinforcing element 5 of the circumferential belt 7.
Test result: Cutting occurred at 33 points on the circumference.

（比較例２）
構造は図１。傾斜ベルト３，４及び周方向ベルト７の諸元は比較例１と同じ。補助周方向ベルト１０の補強素子８の材質、打ち込み及び波長は周方向ベルト７の補強素子５のものと基本的に同じであるが、リボン材９の破断伸びを３．３％にするために振幅を３．５mmに増加させた。
試験結果：周上の５箇所で切れ発生。 (Comparative Example 2)
The structure is shown in FIG. The specifications of the inclined belts 3 and 4 and the circumferential belt 7 are the same as those in Comparative Example 1. The material, driving and wavelength of the reinforcing element 8 of the auxiliary circumferential belt 10 are basically the same as those of the reinforcing element 5 of the circumferential belt 7, but in order to make the elongation at break of the ribbon material 9 3.3%. The amplitude was increased to 3.5 mm.
Test result: Cutting occurred at 5 locations on the circumference.

（従来例）
実施例１から補助周方向ベルト１０を除いたもの。
試験結果：周上の２５箇所で切れ発生。 (Conventional example)
1. The auxiliary circumferential belt 10 is removed from the first embodiment.
Test result: Cutting occurred at 25 locations on the circumference.

以上の試験結果より、本発明の各実施例によれば、長距離走行後にも周方向ベルト７の補強素子５の切れは全く発見されず、耐久性が向上していることが確認できた。   From the above test results, according to each example of the present invention, it was confirmed that no breakage of the reinforcing element 5 of the circumferential belt 7 was found even after long distance running, and durability was improved.

なお、以上の実施形態では、周方向ベルト７を傾斜ベルト３のタイヤ半径方向内側に配置したが、周方向ベルト７を傾斜ベルト３のタイヤ半径方向外側に配置してもよい。また、補助周方向ベルト１０，１２については、傾斜ベルトが１枚だけ存在する領域、つまり最も幅の広い傾斜ベルトの幅方向の端部、と重なり合うように配置することが好ましい。その理由は、傾斜ベルトの幅方向端部を補助周方向ベルトで覆うことにより、傾斜ベルトの幅方向端部からのセパレーション発生も抑制できるからである。   In the above embodiment, the circumferential belt 7 is disposed on the inner side in the tire radial direction of the inclined belt 3. However, the circumferential belt 7 may be disposed on the outer side in the tire radial direction of the inclined belt 3. Further, the auxiliary circumferential belts 10 and 12 are preferably arranged so as to overlap with a region where only one inclined belt exists, that is, an end portion in the width direction of the widest inclined belt. The reason is that the occurrence of separation from the widthwise end of the inclined belt can be suppressed by covering the widthwise end of the inclined belt with the auxiliary circumferential belt.

本発明に係る空気入りタイヤの第１の実施形態の幅方向の要部断面図及び平面図である。It is principal part sectional drawing and the top view of the width direction of 1st Embodiment of the pneumatic tire which concerns on this invention. 本発明に係る空気入りタイヤの第２の実施形態の幅方向の要部断面図及び平面図である。It is principal part sectional drawing and the top view of the width direction of 2nd Embodiment of the pneumatic tire which concerns on this invention.

符号の説明Explanation of symbols

１・・・カーカス、２・・・トレッド部、３，４・・・傾斜ベルト、５，８，・・・補強素子、６，９・・・リボン材、７・・・周方向ベルト、１０，１２・・・補助周方向ベルト。   DESCRIPTION OF SYMBOLS 1 ... Carcass, 2 ... Tread part, 3, 4 ... Inclined belt, 5, 8, ... Reinforcing element, 6, 9 ... Ribbon material, 7 ... Circumferential belt, 10 , 12 ... Auxiliary circumferential belt.

Claims (6)

カーカスと、
前記カーカスのタイヤ半径方向外側に配置された傾斜ベルト層と、
補強素子を有するリボン材を赤道面に実質的に平行に巻いて形成した周方向ベルトと、
前記周方向ベルトの端部のタイヤ幅方向外側に配置された補強ベルトと
を備えたことを特徴とする空気入りタイヤ。 With carcass,
An inclined belt layer disposed on the outer side in the tire radial direction of the carcass;
A circumferential belt formed by winding a ribbon material having a reinforcing element substantially parallel to the equator plane;
A pneumatic tire, comprising: a reinforcing belt disposed on an outer side in a tire width direction of an end portion of the circumferential belt. 前記補強ベルトは、補強素子を有するリボン材を赤道面に実質的に平行に巻いて形成したものである特徴とする請求項１記載の空気入りタイヤ。   The pneumatic tire according to claim 1, wherein the reinforcing belt is formed by winding a ribbon material having a reinforcing element substantially parallel to the equator plane. 前記補強ベルトは、１枚の傾斜ベルトのみと重なり合う位置に配置されていることを特徴とする請求項１記載の空気入りタイヤ。   The pneumatic tire according to claim 1, wherein the reinforcing belt is disposed at a position overlapping only one inclined belt. 最も幅の広い傾斜ベルトの半径方向外側に前記補強ベルトが配置され、前記半径方向の内側に前記周方向ベルトが配置されていることを特徴とする請求項１記載の空気入りタイヤ。   2. The pneumatic tire according to claim 1, wherein the reinforcing belt is disposed on the radially outer side of the widest inclined belt, and the circumferential belt is disposed on the radially inner side. 前記周方向ベルトの補強素子はスチールコード又はスチールフィラメントからなり、前記補強ベルトの補強素子は有機繊維からなることを特徴とする請求項２記載の空気入りタイヤ。   The pneumatic tire according to claim 2, wherein the reinforcing element of the circumferential belt is made of a steel cord or a steel filament, and the reinforcing element of the reinforcing belt is made of an organic fiber. 前記補強ベルトを構成するリボン材の破断伸びは、前記周方向ベルトを構成するリボン材の破断伸びよりも０．５％以上大きいことを特徴とする請求項２記載の空気入りタイヤ。   The pneumatic tire according to claim 2, wherein the breaking elongation of the ribbon material constituting the reinforcing belt is 0.5% or more larger than the breaking elongation of the ribbon material constituting the circumferential belt.
JP2004175757A 2004-06-14 2004-06-14 Pneumatic tire Expired - Fee Related JP4514111B2 (en)

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WO2008078794A1 (en) * 2006-12-26 2008-07-03 Bridgestone Corporation Pneumatic tire
JP2009166818A (en) * 2007-12-17 2009-07-30 Bridgestone Corp Pneumatic tire
JP2009166819A (en) * 2007-12-17 2009-07-30 Bridgestone Corp Pneumatic tire
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JP2009166664A (en) * 2008-01-16 2009-07-30 Bridgestone Corp Pneumatic tire
JP2009166661A (en) * 2008-01-16 2009-07-30 Bridgestone Corp Pneumatic tire
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JP2009234287A (en) * 2008-03-25 2009-10-15 Bridgestone Corp Pneumatic tire
JP2009234329A (en) * 2008-03-26 2009-10-15 Bridgestone Corp Pneumatic tire
JP2009248573A (en) * 2008-04-01 2009-10-29 Bridgestone Corp Pneumatic tire and its manufacturing method
JP2009255615A (en) * 2008-04-11 2009-11-05 Bridgestone Corp Pneumatic tire
JP2009255619A (en) * 2008-04-11 2009-11-05 Bridgestone Corp Pneumatic tire
JP2010155553A (en) * 2008-12-26 2010-07-15 Bridgestone Corp Pneumatic radial tire
JP2012179971A (en) * 2011-02-28 2012-09-20 Bridgestone Corp Pneumatic tire
JP7494492B2 (en) 2020-03-06 2024-06-04 住友ゴム工業株式会社 Heavy Duty Tires
JP2022047999A (en) * 2020-09-14 2022-03-25 住友ゴム工業株式会社 Pneumatic tire for heavy load
JP7131589B2 (en) 2020-09-14 2022-09-06 住友ゴム工業株式会社 Heavy duty pneumatic tire
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US20230014133A1 (en) * 2021-07-07 2023-01-19 Sumitomo Rubber Industries, Ltd. Heavy duty tire

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