JP2010137650A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2010137650A
JP2010137650A JP2008314481A JP2008314481A JP2010137650A JP 2010137650 A JP2010137650 A JP 2010137650A JP 2008314481 A JP2008314481 A JP 2008314481A JP 2008314481 A JP2008314481 A JP 2008314481A JP 2010137650 A JP2010137650 A JP 2010137650A
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layer
carcass
adhesive rubber
pneumatic tire
jis
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JP5228866B2 (en
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Nobuo Suzuki
亘男 鈴木
Hiroshi Hata
寛 畑
Yoshiaki Hashimura
嘉章 橋村
Kazuyuki Kabe
和幸 加部
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of improving durability while keeping favorable controllability, stability and ride comfort, in the pneumatic tire including carcass layers separated in a tread. <P>SOLUTION: The carcass layers 4 separated in the tread portion 1 are laid between a pair of beads 3, 3, and a belt layer 6 is disposed at an outer peripheral side of the carcass layer 4 in the tread 1. Adhesive rubber layers 7 are interposed between the belt layer 6 and each divided piece 4A of the carcass layers 4. The JIS-A hardness of the adhesive rubber layer 7 is set to be larger than the JIS-A hardness of the rubber of the carcass layer 4, and the JIS-A hardness of the adhesive rubber layer 7 is set to be smaller than the JIS-A hardness of the rubber of the belt layer 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、トレッド部にて分割されたカーカス層を備えた空気入りタイヤに関し、更に詳しくは、操縦安定性や乗り心地を良好に維持しながら、耐久性を向上することを可能にした空気入りタイヤに関する。   The present invention relates to a pneumatic tire having a carcass layer divided at a tread portion, and more particularly, a pneumatic tire capable of improving durability while maintaining good driving stability and riding comfort. Regarding tires.

近年、空気入りタイヤにおいて、製造上の不都合の解消やタイヤ性能の向上などを目的として、トレッド部にベルト層を埋設する一方で、そのトレッド部においてカーカス層を分割することが提案されている(例えば、特許文献1参照)。このような空気入りタイヤでは、トレッド部においてカーカス層を分割しても、トレッド部に埋設された剛直なベルト層が張力を担持するため十分な内圧保持能力を発揮することが可能である。   In recent years, it has been proposed to divide a carcass layer in a tread portion while embedding a belt layer in the tread portion for the purpose of eliminating manufacturing problems and improving tire performance in a pneumatic tire ( For example, see Patent Document 1). In such a pneumatic tire, even if the carcass layer is divided in the tread portion, the rigid belt layer embedded in the tread portion carries the tension, so that it is possible to exhibit a sufficient internal pressure holding capability.

しかしながら、カーカス層をトレッド部にてタイヤ幅方向に分割した場合、ベルト層とカーカス層との界面に応力が集中するため、その部分を起点として故障を生じ易くなる。そこで、分割構造のカーカス層を備えた空気入りタイヤにおいて、ベルト層とカーカス層との間に該カーカス層の各分割片を密接するように補強コードを含む継ぎプライを介在させることが提案されている(例えば、特許文献2参照)。しかし、補強コードを含む継ぎプライを挿入しても、その界面に応力が集中するため、耐久性の改善効果を十分に得ることは難しい。
特開2001−187511号公報 特開平10−157408号公報
However, when the carcass layer is divided in the tire width direction at the tread portion, stress concentrates on the interface between the belt layer and the carcass layer, so that failure tends to occur starting from that portion. Accordingly, in a pneumatic tire having a carcass layer having a split structure, it has been proposed that a joint ply including a reinforcing cord is interposed between the belt layer and the carcass layer so that the split pieces of the carcass layer are in close contact with each other. (For example, see Patent Document 2). However, even if a splicing ply including a reinforcing cord is inserted, stress concentrates on the interface, and it is difficult to obtain a sufficient durability improvement effect.
JP 2001-187511 A Japanese Patent Laid-Open No. 10-157408

本発明の目的は、トレッド部にて分割されたカーカス層を備えた空気入りタイヤにおいて、操縦安定性や乗り心地を良好に維持しながら、耐久性を向上することを可能にした空気入りタイヤを提供することにある。   It is an object of the present invention to provide a pneumatic tire having a carcass layer divided at a tread portion, and capable of improving durability while maintaining good steering stability and ride comfort. It is to provide.

上記目的を達成するための本発明の空気入りタイヤは、一対のビード部間にトレッド部にて分割されたカーカス層を装架すると共に、前記トレッド部におけるカーカス層の外周側にベルト層を配置し、該ベルト層と前記カーカス層の各分割片との間に接着ゴム層を介在させ、該接着ゴム層のJIS-A 硬度を前記カーカス層のゴム部のJIS-A 硬度よりも大きくし、かつ該接着ゴム層のJIS-A 硬度を前記ベルト層のゴム部のJIS-A 硬度よりも小さくしたことを特徴とするものである。   In order to achieve the above object, a pneumatic tire according to the present invention has a carcass layer divided by a tread portion between a pair of bead portions and a belt layer disposed on the outer periphery side of the carcass layer in the tread portion. An adhesive rubber layer is interposed between the belt layer and each segment of the carcass layer, and the JIS-A hardness of the adhesive rubber layer is larger than the JIS-A hardness of the rubber portion of the carcass layer, Further, the JIS-A hardness of the adhesive rubber layer is smaller than the JIS-A hardness of the rubber part of the belt layer.

ここで、本発明におけるJIS-A 硬度とは、JIS K6253「加硫ゴム及び熱可塑性ゴム−硬さの求め方」に準拠して測定されるものであり、タイプAデュロメータを用いて測定されるデュロメータ硬さを意味するものである。   Here, the JIS-A hardness in the present invention is measured according to JIS K6253 “vulcanized rubber and thermoplastic rubber—how to obtain hardness”, and is measured using a type A durometer. It means durometer hardness.

本発明では、トレッド部にて分割されたカーカス層を備えた空気入りタイヤにおいて、ベルト層とカーカス層の各分割片との間に接着ゴム層を介在させ、その接着ゴム層のJIS-A 硬度をカーカス層のゴム部のJIS-A 硬度よりも大きくすると共にベルト層のゴム部のJIS-A 硬度よりも小さくすることにより、ベルト層とカーカス層との界面への応力集中を回避し、空気入りタイヤの耐久性を向上することができる。また、ベルト層とカーカス層の各分割片との間に接着ゴム層を介在させても、操縦安定性や乗り心地を良好に維持することが可能である。   In the present invention, in a pneumatic tire having a carcass layer divided at a tread portion, an adhesive rubber layer is interposed between the belt layer and each divided piece of the carcass layer, and the JIS-A hardness of the adhesive rubber layer Is made larger than the JIS-A hardness of the rubber part of the carcass layer and smaller than the JIS-A hardness of the rubber part of the belt layer to avoid stress concentration at the interface between the belt layer and the carcass layer, The durability of the entering tire can be improved. Further, even if an adhesive rubber layer is interposed between the belt layer and each divided piece of the carcass layer, it is possible to maintain good steering stability and riding comfort.

本発明において、接着ゴム層のベルト層とカーカス層の各分割片とで挟まれた部分の幅W1はベルト層の半幅W0に対して0.1≦W1/W0の関係にすることが好ましい。また、接着ゴム層のベルト層とカーカス層の各分割片とで挟まれた部分の厚さTは0.3mm以上4.0mm以下にすることが好ましい。更に、ベルト層とカーカス層の各分割片との重なり幅W2はベルト層の半幅W0に対して0.1≦W2/W0の関係にすることが好ましい。これにより、操縦安定性や乗り心地を良好に維持しながら、耐久性を効果的に向上することができる。   In the present invention, the width W1 of the portion sandwiched between the belt layer of the adhesive rubber layer and each segment of the carcass layer is preferably in a relationship of 0.1 ≦ W1 / W0 with respect to the half width W0 of the belt layer. Further, the thickness T of the portion sandwiched between the belt layer of the adhesive rubber layer and each segment of the carcass layer is preferably 0.3 mm or more and 4.0 mm or less. Furthermore, it is preferable that the overlap width W2 between the belt layer and each segment of the carcass layer is in a relation of 0.1 ≦ W2 / W0 with respect to the half width W0 of the belt layer. Thereby, durability can be effectively improved, maintaining steering stability and riding comfort satisfactorily.

車両装着時におけるタイヤ表裏の装着向きが指定された空気入りタイヤにおいては、以下の非対称構造を採用することができる。即ち、接着ゴム層のベルト層とカーカス層の各分割片とで挟まれた部分の幅W1を車両内側と車両外側とで互いに異ならせ、車両外側における幅W1の値を相対的に大きくした非対称構造を採用可能である。この場合、特に操縦安定性を改善することができる。また、接着ゴム層のベルト層とカーカス層の各分割片とで挟まれた部分の厚さTを車両内側と車両外側とで互いに異ならせ、車両外側における厚さTの値を相対的に小さくした非対称構造を採用可能である。この場合、特に乗り心地を改善することができる。   The following asymmetric structure can be adopted in a pneumatic tire in which the mounting direction of the tire front and back is specified when the vehicle is mounted. That is, the width W1 of the portion sandwiched between the belt layer of the adhesive rubber layer and each segment of the carcass layer is made different between the vehicle inner side and the vehicle outer side, and the width W1 on the vehicle outer side is relatively increased. A structure can be adopted. In this case, the steering stability can be improved. In addition, the thickness T of the portion sandwiched between the belt layer of the adhesive rubber layer and each segment of the carcass layer is made different between the vehicle inner side and the vehicle outer side, and the value of the thickness T on the vehicle outer side is relatively small. An asymmetrical structure can be adopted. In this case, the ride comfort can be improved.

以下、本発明の構成について添付の図面を参照しながら詳細に説明する。図1は本発明の実施形態からなる乗用車用空気入りタイヤを示し、1はトレッド部、2はサイドウォール部、3はビード部である。一対のビード部3,3間には、タイヤ径方向に延びる複数本のカーカスコードと該カーカスコードを被覆するゴム部分とからなるカーカス層4が装架されている。カーカスコードとしては、ポリエステルコードやナイロンコード等の有機繊維コードの他、スチールコードを使用することができる。カーカス層4はトレッド部1においてタイヤ幅方向に分割されている。つまり、カーカス層4は一対の分割片4A,4Aから構成されている。これらカーカス層4の分割片4A,4Aのタイヤ幅方向外側の端部はビードコア5の廻りにタイヤ内側から外側に折り返されている。   Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a pneumatic tire for a passenger car according to an embodiment of the present invention, wherein 1 is a tread portion, 2 is a sidewall portion, and 3 is a bead portion. A carcass layer 4 including a plurality of carcass cords extending in the tire radial direction and a rubber portion covering the carcass cords is mounted between the pair of bead portions 3 and 3. As the carcass cord, a steel cord can be used in addition to an organic fiber cord such as a polyester cord and a nylon cord. The carcass layer 4 is divided in the tire width direction in the tread portion 1. That is, the carcass layer 4 is composed of a pair of divided pieces 4A and 4A. The ends of the carcass layer 4 on the outer side in the tire width direction of the divided pieces 4A and 4A are folded around the bead core 5 from the tire inner side to the outer side.

一方、トレッド部1におけるカーカス層4の外周側には複数層のベルト層6が埋設されている。これらベルト層6はタイヤ周方向に対して傾斜する複数本のベルトコードと該ベルトコードを被覆するゴム部分とからなり、かつ層間でベルトコードが互いに交差するように配置されている。ベルトコードとしては、スチールコードの他、アラミドコード等の有機繊維コードを使用することができる。ベルト層6の外周側には、必要に応じて、補強コードをタイヤ周方向に巻回してなるベルトカバー層を配置しても良い。   On the other hand, a plurality of belt layers 6 are embedded on the outer peripheral side of the carcass layer 4 in the tread portion 1. These belt layers 6 are composed of a plurality of belt cords inclined with respect to the tire circumferential direction and rubber portions covering the belt cords, and are arranged so that the belt cords cross each other between the layers. As the belt cord, an organic fiber cord such as an aramid cord can be used in addition to a steel cord. A belt cover layer formed by winding a reinforcing cord in the tire circumferential direction may be disposed on the outer peripheral side of the belt layer 6 as necessary.

上記空気入りタイヤにおいて、ベルト層6とカーカス層4の各分割片4Aとの間には接着ゴム層7が挿入されている。接着ゴム層7は、カーカス層4のゴム部のJIS-A 硬度よりも大きく、かつベルト層6のゴム部のJIS-A 硬度よりも小さいJIS-A 硬度を呈するゴム組成物から構成されている。また、接着ゴム層7のJIS-A 硬度とカーカス層4のゴム部のJIS-A 硬度又はベルト層6のゴム部のJIS-A 硬度との差は、2ポイント以上とすることが好ましく、更に好ましくは4ポイント以上とする。   In the pneumatic tire, an adhesive rubber layer 7 is inserted between the belt layer 6 and each divided piece 4 </ b> A of the carcass layer 4. The adhesive rubber layer 7 is composed of a rubber composition exhibiting a JIS-A hardness that is greater than the JIS-A hardness of the rubber part of the carcass layer 4 and smaller than the JIS-A hardness of the rubber part of the belt layer 6. . The difference between the JIS-A hardness of the adhesive rubber layer 7 and the JIS-A hardness of the rubber part of the carcass layer 4 or the JIS-A hardness of the rubber part of the belt layer 6 is preferably 2 points or more. Preferably it is 4 points or more.

このようにトレッド部1にて分割されたカーカス層4を備えた空気入りタイヤにおいて、ベルト層6とカーカス層4の各分割片4Aとの間に接着ゴム層7を介在させ、その接着ゴム層7のJIS-A 硬度をカーカス層4のゴム部のJIS-A 硬度よりも大きくすると共にベルト層6のゴム部のJIS-A 硬度よりも小さくすることにより、ベルト層6とカーカス層4との界面への応力集中を回避し、空気入りタイヤの耐久性を向上することができる。しかも、ベルト層6とカーカス層4の各分割片4Aとの間に接着ゴム層7を介在させても、操縦安定性や乗り心地を良好に維持することができる。   Thus, in the pneumatic tire provided with the carcass layer 4 divided by the tread portion 1, the adhesive rubber layer 7 is interposed between the belt layer 6 and each divided piece 4A of the carcass layer 4, and the adhesive rubber layer. 7 is made larger than the JIS-A hardness of the rubber part of the carcass layer 4 and smaller than the JIS-A hardness of the rubber part of the belt layer 6, so that the belt layer 6 and the carcass layer 4 Stress concentration on the interface can be avoided, and the durability of the pneumatic tire can be improved. In addition, even if the adhesive rubber layer 7 is interposed between the belt layer 6 and each divided piece 4A of the carcass layer 4, it is possible to maintain good steering stability and riding comfort.

上記空気入りタイヤにおいて、接着ゴム層7のベルト層6とカーカス層4の各分割片4Aとで挟まれた部分の幅W1は、タイヤ赤道Eを中心とするベルト層6の半幅W0に対して0.1≦W1/W0の関係に設定すると良い(図2〜図4参照)。ここで、0.1>W1/W0であると、耐久性の改善効果が不十分になる。   In the pneumatic tire described above, the width W1 of the portion sandwiched between the belt layer 6 of the adhesive rubber layer 7 and each divided piece 4A of the carcass layer 4 is smaller than the half width W0 of the belt layer 6 centering on the tire equator E. It is preferable to set a relationship of 0.1 ≦ W1 / W0 (see FIGS. 2 to 4). Here, if 0.1> W1 / W0, the durability improving effect is insufficient.

また、接着ゴム層7のベルト層6とカーカス層4の各分割片4Aとで挟まれた部分の厚さTは、0.3mm以上4.0mm以下に設定すると良い。ここで、接着ゴム層7の厚さTが0.3mm未満であると耐久性の改善効果が不十分になり、逆に4.0mmを超えると操縦安定性が悪化する。   Further, the thickness T of the portion sandwiched between the belt layer 6 of the adhesive rubber layer 7 and the respective divided pieces 4A of the carcass layer 4 is preferably set to 0.3 mm or more and 4.0 mm or less. Here, if the thickness T of the adhesive rubber layer 7 is less than 0.3 mm, the effect of improving the durability is insufficient, and conversely, if it exceeds 4.0 mm, the steering stability is deteriorated.

更に、ベルト層6とカーカス層4の各分割片4Aとのタイヤ幅方向の重なり幅W2は、タイヤ赤道Eを中心とするベルト層6の半幅W0に対して0.1≦W2/W0の関係に設定すると良い。ここで、0.1>W2/W0であると、耐久性の改善効果が不十分になる。   Further, the overlap width W2 in the tire width direction between the belt layer 6 and each segment 4A of the carcass layer 4 has a relationship of 0.1 ≦ W2 / W0 with respect to the half width W0 of the belt layer 6 centering on the tire equator E. It is good to set to. Here, if 0.1> W2 / W0, the durability improving effect is insufficient.

操縦安定性を重視する場合、図2に示すように、接着ゴム層7を薄くて幅広とする。この場合、接着ゴム層7の幅W1を0.2≦W1/W0の関係、より好ましくは、0.2≦W1/W0≦0.5の関係に設定し、かつ接着ゴム層7の厚さTを0.3mm以上1.5mm以下に設定することが望ましい。   When importance is attached to steering stability, the adhesive rubber layer 7 is made thin and wide as shown in FIG. In this case, the width W1 of the adhesive rubber layer 7 is set to a relationship of 0.2 ≦ W1 / W0, more preferably a relationship of 0.2 ≦ W1 / W0 ≦ 0.5, and the thickness of the adhesive rubber layer 7 is set. It is desirable to set T to 0.3 mm or more and 1.5 mm or less.

一方、乗り心地を重視する場合、図3に示すように、接着ゴム層7を厚くて幅狭とする。この場合、接着ゴム層7の幅W1を0.1≦W1/W0の関係、より好ましくは、0.5≦W1/W0≦0.7の関係に設定し、かつ接着ゴム層7の厚さTを1.5mm以上4.0mm以下に設定することが望ましい。   On the other hand, when importance is attached to riding comfort, the adhesive rubber layer 7 is made thick and narrow as shown in FIG. In this case, the width W1 of the adhesive rubber layer 7 is set to a relationship of 0.1 ≦ W1 / W0, more preferably 0.5 ≦ W1 / W0 ≦ 0.7, and the thickness of the adhesive rubber layer 7 is set. It is desirable to set T to 1.5 mm or more and 4.0 mm or less.

また、車両装着時におけるタイヤ表裏の装着向きが指定された空気入りタイヤにおいては、図4に示すような非対称構造を採用することができる。図4において、INは車両装着時における車両内側であり、OUTは車両装着時における車両外側である。図4に示すように、接着ゴム層7のベルト層6とカーカス層4の各分割片4Aとで挟まれた部分の幅W1は車両内側と車両外側とで互いに異なっており、車両外側における幅W1の値が相対的に大きくなっている。また、接着ゴム層7のベルト層6とカーカス層4の各分割片4Aとで挟まれた部分の厚さTは車両内側と車両外側とで互いに異なっており、車両外側における厚さTの値が相対的に小さくなっている。   In addition, an asymmetric structure as shown in FIG. 4 can be employed in a pneumatic tire in which the mounting direction of the tire front and back is specified when the vehicle is mounted. In FIG. 4, IN is the inside of the vehicle when the vehicle is mounted, and OUT is the outside of the vehicle when the vehicle is mounted. As shown in FIG. 4, the width W1 of the portion sandwiched between the belt layer 6 of the adhesive rubber layer 7 and each segment 4A of the carcass layer 4 is different between the vehicle inner side and the vehicle outer side. The value of W1 is relatively large. Further, the thickness T of the portion sandwiched between the belt layer 6 of the adhesive rubber layer 7 and each segment 4A of the carcass layer 4 is different between the vehicle inner side and the vehicle outer side, and the value of the thickness T on the vehicle outer side is different. Is relatively small.

特にネガティブキャンバーが設定された車両では、空気入りタイヤの車両内側の構造が乗り心地に大きく影響し、空気入りタイヤの車両外側の構造が操縦安定性に大きく影響する。これに対して、上記非対称構造では、車両内側に配置される接着ゴム層7を厚くて幅狭とすることで乗り心地を改善する一方で、車両外側に配置される接着ゴム層7を薄くて幅広とすることで操縦安定性を改善するので、これら操縦安定性と乗り心地とを高いレベルで両立することが可能になる。   In particular, in a vehicle in which a negative camber is set, the structure on the inner side of the pneumatic tire greatly affects the ride comfort, and the structure on the outer side of the pneumatic tire greatly affects the steering stability. On the other hand, in the asymmetric structure, the adhesive rubber layer 7 disposed on the inner side of the vehicle is made thicker and narrower to improve riding comfort, while the adhesive rubber layer 7 disposed on the outer side of the vehicle is thinned. Since the steering stability is improved by increasing the width, it is possible to achieve both the steering stability and the ride comfort at a high level.

タイヤサイズ225/45R18で、一対のビード部間にトレッド部にて分割されたカーカス層を装架すると共に、トレッド部におけるカーカス層の外周側にベルト層を配置し、該ベルト層とカーカス層の各分割片との間に接着ゴム層を介在させ、接着ゴム層のJIS-A 硬度、カーカス層のゴム部のJIS-A 硬度、ベルト層のゴム部のJIS-A 硬度、ベルト層の半幅W0に対する接着ゴム層の幅W1の比(W1/W0)、ベルト層の半幅W0に対するカーカス層の各分割片の重なり幅W2の比(W2/W0)、接着ゴム層の厚さTを表1のように設定した実施例1〜3及び比較例1〜2の空気入りタイヤを製作した。比較のため、接着ゴム層を持たないこと以外は上記と同様の構成を有する従来例1のタイヤ、及び、ベルト層とカーカス層の各分割片との間に接着ゴム層の替わりにカーカス層と同様のコード層を介在させたこと以外は上記と同様の構成を有する従来例2のタイヤを用意した。   In the tire size 225 / 45R18, a carcass layer divided by a tread portion is mounted between a pair of bead portions, and a belt layer is disposed on the outer peripheral side of the carcass layer in the tread portion, and the belt layer and the carcass layer Adhesive rubber layer is interposed between each piece, JIS-A hardness of adhesive rubber layer, JIS-A hardness of rubber part of carcass layer, JIS-A hardness of rubber part of belt layer, half width W0 of belt layer Table 1 shows the ratio of the width W1 of the adhesive rubber layer to W1 (W1 / W0), the ratio of the overlap width W2 of each segment of the carcass layer to the half width W0 of the belt layer (W2 / W0), and the thickness T of the adhesive rubber layer. The pneumatic tires of Examples 1 to 3 and Comparative Examples 1 and 2 set as described above were manufactured. For comparison, the tire of Conventional Example 1 having the same configuration as described above except that the adhesive rubber layer is not provided, and the carcass layer instead of the adhesive rubber layer between the belt layer and the carcass layer divided pieces. A tire of Conventional Example 2 having the same configuration as described above was prepared except that a similar cord layer was interposed.

これら試験タイヤについて、下記の評価方法により、耐久性、操縦安定性、乗り心地を評価し、その結果を表1に併せて示した。   These test tires were evaluated for durability, handling stability, and riding comfort by the following evaluation methods, and the results are also shown in Table 1.

耐久性:
各試験タイヤについて、JIS D4230に準拠して耐久性能試験を実施した後、引き続き4時間毎に初期荷重の15%づつ負荷を増加させ、タイヤに故障が生じるまでの走行距離を計測した。評価結果は、従来例1を100とする指数にて示した。この指数値が大きいほど耐久性が優れていることを意味する。
durability:
Each test tire was subjected to a durability performance test in accordance with JIS D4230, and then the load was increased by 15% of the initial load every 4 hours, and the travel distance until the tire failed was measured. The evaluation results are shown as an index with Conventional Example 1 as 100. The larger the index value, the better the durability.

操縦安定性:
各試験タイヤをリムサイズ18×7.5Jのホイールに組み付けて試験車両に装着し、空気圧230kPaとし、テストコースにおいてドライバーによる官能評価を行った。評価結果は、従来例1を100とする指数にて示した。この指数値が大きいほど操縦安定性が優れていることを意味する。
Steering stability:
Each test tire was assembled on a wheel having a rim size of 18 × 7.5 J and mounted on a test vehicle. The air pressure was 230 kPa, and a sensory evaluation was performed by a driver on the test course. The evaluation results are shown as an index with Conventional Example 1 as 100. The larger the index value, the better the steering stability.

乗り心地:
各試験タイヤをリムサイズ18×7.5Jのホイールに組み付けて試験車両に装着し、空気圧230kPaとし、テストコースにおいてドライバーによる官能評価を行った。評価結果は、従来例1を100とする指数にて示した。この指数値が大きいほど乗り心地が優れていることを意味する。
Ride comfort:
Each test tire was assembled on a wheel having a rim size of 18 × 7.5 J and mounted on a test vehicle. The air pressure was 230 kPa, and a sensory evaluation was performed by a driver on the test course. The evaluation results are shown as an index with Conventional Example 1 as 100. The larger the index value, the better the ride comfort.

Figure 2010137650
Figure 2010137650

この表1から明らかなように、実施例1〜3のタイヤは、従来例1〜2に比べて耐久性が大幅に向上し、しかも操縦安定性及び乗り心地が良好であった。一方、比較例1〜2のタイヤは、接着ゴム層のJIS-A 硬度がカーカス層のゴム部のJIS-A 硬度とベルト層のゴム部のJIS-A 硬度との中間値になっていないため、耐久性の改善効果が得られなかった。   As is apparent from Table 1, the tires of Examples 1 to 3 were significantly improved in durability as compared with Conventional Examples 1 and 2, and also had good steering stability and riding comfort. On the other hand, in the tires of Comparative Examples 1 and 2, the JIS-A hardness of the adhesive rubber layer is not an intermediate value between the JIS-A hardness of the rubber part of the carcass layer and the JIS-A hardness of the rubber part of the belt layer. The durability improvement effect was not obtained.

次に、実施例2の構成の一部を表2のように変更した実施例4〜6の空気入りタイヤをそれぞれ製作した。実施例4〜6は、接着ゴム層の寸法を種々異ならせたものである。   Next, pneumatic tires of Examples 4 to 6 in which a part of the configuration of Example 2 was changed as shown in Table 2 were manufactured. In Examples 4 to 6, the sizes of the adhesive rubber layers are variously changed.

これら試験タイヤについて、上述の評価方法により、耐久性、操縦安定性、乗り心地を評価し、その結果を表2に併せて示した。   These test tires were evaluated for durability, handling stability, and riding comfort by the above-described evaluation methods, and the results are also shown in Table 2.

Figure 2010137650
Figure 2010137650

この表2に示すように、接着ゴム層を薄くて幅広とした場合(実施例4)、操縦安定性が相対的に良くなっていた。また、接着ゴム層を厚くて幅狭とした場合(実施例5)、乗り心地が相対的に良くなっていた。更に、車両内側に配置される接着ゴム層を厚くて幅狭とする一方で、車両外側に配置される接着ゴム層を薄くて幅広とした場合(実施例6)、操縦安定性及び乗り心地が共に良くなっていた。   As shown in Table 2, when the adhesive rubber layer was thin and wide (Example 4), the steering stability was relatively improved. In addition, when the adhesive rubber layer was thick and narrow (Example 5), the ride comfort was relatively improved. Further, when the adhesive rubber layer disposed inside the vehicle is thick and narrow while the adhesive rubber layer disposed outside the vehicle is thin and wide (Example 6), steering stability and riding comfort are improved. Both were getting better.

本発明の実施形態からなる乗用車用空気入りタイヤを示す子午線断面図である。1 is a meridian cross-sectional view showing a passenger car pneumatic tire according to an embodiment of the present invention. 本発明の空気入りタイヤの骨格構造の一例を概略的に示す子午線断面図である。It is a meridian cross-sectional view schematically showing an example of the skeleton structure of the pneumatic tire of the present invention. 本発明の空気入りタイヤの骨格構造の一例を概略的に示す子午線断面図である。It is a meridian cross-sectional view schematically showing an example of the skeleton structure of the pneumatic tire of the present invention. 本発明の空気入りタイヤの骨格構造の一例を概略的に示す子午線断面図である。It is a meridian cross-sectional view schematically showing an example of the skeleton structure of the pneumatic tire of the present invention.

符号の説明Explanation of symbols

1 トレッド部
2 サイドウォール部
3 ビード部
4 カーカス層
4A カーカス層の分割片
5 ビードコア
6 ベルト層
7 接着ゴム層
DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 3 Bead part 4 Carcass layer 4A Divided piece of carcass layer 5 Bead core 6 Belt layer 7 Adhesive rubber layer

Claims (6)

一対のビード部間にトレッド部にて分割されたカーカス層を装架すると共に、前記トレッド部におけるカーカス層の外周側にベルト層を配置し、該ベルト層と前記カーカス層の各分割片との間に接着ゴム層を介在させ、該接着ゴム層のJIS-A 硬度を前記カーカス層のゴム部のJIS-A 硬度よりも大きくし、かつ該接着ゴム層のJIS-A 硬度を前記ベルト層のゴム部のJIS-A 硬度よりも小さくしたことを特徴とする空気入りタイヤ。   A carcass layer divided at the tread portion is mounted between a pair of bead portions, and a belt layer is disposed on the outer peripheral side of the carcass layer in the tread portion, and the belt layer and each divided piece of the carcass layer An adhesive rubber layer is interposed therebetween, the JIS-A hardness of the adhesive rubber layer is larger than the JIS-A hardness of the rubber part of the carcass layer, and the JIS-A hardness of the adhesive rubber layer is A pneumatic tire characterized by being smaller than the JIS-A hardness of the rubber part. 前記接着ゴム層の前記ベルト層と前記カーカス層の各分割片とで挟まれた部分の幅W1を前記ベルト層の半幅W0に対して0.1≦W1/W0の関係にしたことを特徴とする請求項1に記載の空気入りタイヤ。   The width W1 of the portion sandwiched between the belt layer of the adhesive rubber layer and each segment of the carcass layer has a relation of 0.1 ≦ W1 / W0 with respect to the half width W0 of the belt layer. The pneumatic tire according to claim 1. 前記接着ゴム層の前記ベルト層と前記カーカス層の各分割片とで挟まれた部分の厚さTを0.3mm以上4.0mm以下にしたことを特徴とする請求項1又は請求項2に記載の空気入りタイヤ。   The thickness T of a portion sandwiched between the belt layer of the adhesive rubber layer and each of the divided pieces of the carcass layer is set to 0.3 mm or greater and 4.0 mm or less. The described pneumatic tire. 前記ベルト層と前記カーカス層の各分割片との重なり幅W2を前記ベルト層の半幅W0に対して0.1≦W2/W0の関係にしたことを特徴とする請求項1〜3のいずれかに記載の空気入りタイヤ。   4. The overlap width W <b> 2 between the belt layer and each divided piece of the carcass layer has a relationship of 0.1 ≦ W <b> 2 / W <b> 0 with respect to the half width W <b> 0 of the belt layer. Pneumatic tire described in 2. 車両装着時におけるタイヤ表裏の装着向きが指定された空気入りタイヤにおいて、前記接着ゴム層の前記ベルト層と前記カーカス層の各分割片とで挟まれた部分の幅W1を車両内側と車両外側とで互いに異ならせ、車両外側における幅W1の値を相対的に大きくしたことを特徴とする請求項1〜4のいずれかに記載の空気入りタイヤ。   In a pneumatic tire in which the mounting direction of the tire front and back is specified when the vehicle is mounted, the width W1 of the portion sandwiched between the belt layer of the adhesive rubber layer and the divided pieces of the carcass layer is set to the vehicle inner side and the vehicle outer side. The pneumatic tire according to any one of claims 1 to 4, characterized in that the width W1 on the outside of the vehicle is relatively increased. 車両装着時におけるタイヤ表裏の装着向きが指定された空気入りタイヤにおいて、前記接着ゴム層の前記ベルト層と前記カーカス層の各分割片とで挟まれた部分の厚さTを車両内側と車両外側とで互いに異ならせ、車両外側における厚さTの値を相対的に小さくしたことを特徴とする請求項1〜5のいずれかに記載の空気入りタイヤ。   In a pneumatic tire in which the mounting direction of the tire front and back is specified when the vehicle is mounted, the thickness T of the portion sandwiched between the belt layer of the adhesive rubber layer and the divided pieces of the carcass layer is set to the vehicle inner side and the vehicle outer side. The pneumatic tire according to claim 1, wherein the value of the thickness T on the outside of the vehicle is relatively small.
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