JP2012171432A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2012171432A
JP2012171432A JP2011033950A JP2011033950A JP2012171432A JP 2012171432 A JP2012171432 A JP 2012171432A JP 2011033950 A JP2011033950 A JP 2011033950A JP 2011033950 A JP2011033950 A JP 2011033950A JP 2012171432 A JP2012171432 A JP 2012171432A
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tire
bead
width direction
section
rubber portion
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JP5771408B2 (en
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Kazuhiko Yamaki
一彦 八巻
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Bridgestone Corp
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Bridgestone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire having improved bead stiffness and bead durability.SOLUTION: The pneumatic tire includes a carcass 2 having a convoluted portion 2a convoluted to at least an outside face in a tire radial direction of a bead core 1, and has a bead filler 6 having a triangular cross section in a tire width direction, disposed outside in the tire radial direction of the bead core 1. The bead filler 6 comprises: a triangular hard rubber portion 6a having the base, which is arranged along the convoluted portion 2a, and having an apex 7, which is opposed to the base 3 and is located outside in the tire radial direction, in a cross section in the tire width direction; and a soft rubber portion 6b covering two sides 8a, 8b adjoining to the base 3 of the hard rubber portion in the cross section in the tire width direction.

Description

本発明は、空気入りタイヤ、特には、タイヤのビード部の耐久性に優れる空気入りタイヤに関する。   The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire excellent in durability of a bead portion of a tire.

従来、例えば特許文献1に記載されているように、タイヤのビード部において、図1のようにビードフィラに硬ゴムと軟ゴムとを併用して、車両の操縦安定性と乗り心地とを両立させたタイヤが提案されている。
しかし、この図1に示すタイヤの構造の場合には、図1のA点に応力が集中するため、セパレーションが生じやすく、ビード耐久性に問題が生じていた。 Conventionally, as described in Patent Document 1, for example, in a tire bead portion, a hard rubber and a soft rubber are used in combination with a bead filler as shown in FIG. Tires have been proposed.
However, in the case of the tire structure shown in FIG. 1, since stress concentrates at point A in FIG. 1, separation is likely to occur, and there is a problem in bead durability.

特開2008-94116号公報JP 2008-94116 A

しかしながら、特許文献2のように追加の部材としてゴムシートBを挿入する場合は、部材増による生産性の悪化や、図3に示すように、シート端部にエアCが入ってしまう恐れがあり、このようなエア入りは亀裂発生の核となり易く、これを起点としたビード部の故障につながる可能性があるという問題があった。   However, when the rubber sheet B is inserted as an additional member as in Patent Document 2, there is a risk that productivity will deteriorate due to an increase in the number of members, and air C may enter the end of the sheet as shown in FIG. Such air entry tends to become a nucleus of crack generation, and there is a problem that it may lead to failure of the bead portion starting from this.

それゆえ、本発明は、これらの問題を解決することを課題とするものであり、その目的は、タイヤのビード部の構造の改良を図ることで、操縦安定性、乗り心地を両立させつつ、ビード耐久性を向上させた空気入りタイヤを提供することにある。   Therefore, the present invention is to solve these problems, the purpose of which is to improve the structure of the bead portion of the tire, while achieving both steering stability and ride comfort, The object is to provide a pneumatic tire with improved bead durability.

発明者らは前記課題を解決すべく、鋭意究明を重ねたところ、タイヤ幅方向断面において、ビードフィラの軟ゴム部をV字型にして、軟ゴム部が、断面三角形状である硬ゴム部を覆うようにし、さらに、硬ゴム部のタイヤ径方向外方の頂点における軟ゴム部のビードフィラのタイヤ幅方向に対するタイヤ外側の厚さをタイヤ内側の厚さより厚くすることによって、操縦安定性と乗り心地を両立させつつビード耐久性を向上させることができること、また、タイヤが外側に倒れこむときの倒れこみを防止できること、さらに、このとき追加の部材を用いないためエア入りを防止でき、部材増によるコストの上昇を回避できること、の知見を得た。   The inventors have made extensive investigations to solve the above problems, and in the tire width direction cross section, the soft rubber portion of the bead filler is V-shaped, and the hard rubber portion has a triangular cross section. In addition, the thickness of the outer side of the tire in the tire width direction of the bead filler of the soft rubber portion at the apex of the hard rubber portion at the outer side in the tire radial direction of the hard rubber portion is made thicker than the inner thickness of the tire. It is possible to improve the bead durability while achieving both of the above, to prevent the tire from collapsing when the tire collapses outward, and at this time, since no additional member is used, it is possible to prevent air from entering, and by increasing the number of members The knowledge that the increase in cost can be avoided was obtained.

本発明にかかる空気入りタイヤは、一対のビードコア間をトロイダル状に跨るカーカス本体部及び該カーカス本体部から前記ビードコアに沿ってタイヤ幅方向内側から外側に巻き回され、少なくとも前記ビードコアのタイヤ径方向外側面まで巻き付けられた巻き込み部を有するカーカスを備え、前記ビードコアのタイヤ径方向外側にタイヤ幅方向断面が三角形状のビードフィラを有する空気入りタイヤであって、
前記ビードフィラは、タイヤ幅方向断面において、底辺が前記巻き込み部に沿って配置され、該底辺に対向する頂点がタイヤ径方向外方にある三角形状の硬質のゴム部と、タイヤ幅方向断面において該硬質のゴム部の前記底辺に隣接する2つの辺を覆う軟質のゴム部とからなることを特徴とする。 A pneumatic tire according to the present invention is a carcass body portion straddling between a pair of bead cores in a toroidal shape, and is wound from the carcass body portion along the bead core from the inside in the tire width direction to the outside, at least in the tire radial direction of the bead core. A pneumatic tire comprising a carcass having a winding portion wound to the outer side surface, and having a bead filler having a triangular cross section in the tire width direction on the outer side in the tire radial direction of the bead core,
The bead filler has a triangular hard rubber portion whose bottom is disposed along the entangled portion in the tire width direction cross section, and whose apex opposite to the bottom is radially outward of the tire, and in the tire width direction cross section, And a soft rubber part covering two sides adjacent to the bottom side of the hard rubber part.

この発明のタイヤにあっては、タイヤ幅方向断面において、ビードフィラの軟ゴム部をV字型にして、軟ゴム部が断面三角形状の硬ゴム部を覆うようにしたことから、硬ゴムとカーカスとの間の応力による歪みを緩和でき、セパレーションを防止してビード耐久性を高めることができる。また、硬ゴム部と軟ゴム部を併用していることにより、操縦安定性及び乗り心地を両立できる。
さらに、タイヤ幅方向断面において、硬ゴム部のタイヤ径方向外方の頂点における軟ゴム部のタイヤ幅方向に対するタイヤ外側の厚さとタイヤ内側の厚さより高くすることによって、硬ゴムの剛性によりタイヤが外側に倒れこむときの倒れこみを抑制することができる。
加えて、本発明においては新たな部材を必要としないので、生産性の悪化を招くことなく、また、エア入りを防止することができる。 In the tire according to the present invention, the soft rubber portion of the bead filler is V-shaped in the tire width direction cross section so that the soft rubber portion covers the hard rubber portion having a triangular cross section. The strain due to the stress between them can be alleviated, the separation can be prevented, and the bead durability can be enhanced. Further, by using both the hard rubber portion and the soft rubber portion, it is possible to achieve both steering stability and ride comfort.
Further, in the cross section in the tire width direction, by setting the thickness of the outer side of the tire with respect to the tire width direction of the soft rubber portion at the apex of the outer side in the tire radial direction of the hard rubber portion and the thickness of the inner side of the tire, It is possible to suppress the collapse when falling to the outside.
In addition, since a new member is not required in the present invention, it is possible to prevent air from entering without deteriorating productivity.

この発明によれば、エア入りや生産性悪化の原因となる新たな部材を用いることなく、操縦安定性及び乗り心地を両立し、かつ、タイヤの外側への倒れこみを抑制できるタイヤを実現することができる。 According to the present invention, it is possible to realize a tire that can achieve both steering stability and riding comfort and can prevent the tire from falling to the outside without using a new member that causes air entry or productivity deterioration. be able to.

従来のタイヤの断面図である。It is sectional drawing of the conventional tire. 他の従来のタイヤの断面図である。It is sectional drawing of another conventional tire. 巻き込み型ビード構造の場合の本発明によるタイヤの断面図である。It is sectional drawing of the tire by this invention in the case of a winding type bead structure. 折り返しプライ構造の場合の本発明によるタイヤの断面図である。It is sectional drawing of the tire by this invention in the case of a folding | turning ply structure.

以下、図面を参照して、本発明を詳細に説明する。図3は、本発明に従う一実施形態の空気入りタイヤ（以下「タイヤ」という）のビード部をタイヤ幅方向断面図にて示している。このタイヤは、図3に示すようにビード部において、ビードコア1とビードコア1に沿ってタイヤ幅方向内側から外側に巻き回され、ビードコア1のタイヤ径方向外側面まで巻き付けられた巻き込み部2aを有するカーカス2とを備えたビード構造となっている。ビード部は、さらに、カーカス2の巻き込み部2aに沿って配置される底辺3と、底辺3に対向する頂点4で交わる内側斜辺5a及び外側斜辺5bとを有する断面三角形状をなすビードフィラ6を有している。
ビードフィラ6は、底辺3と底辺3に対向する頂点7で交わる内側斜辺8a及び外側斜辺8bを有する断面三角形状をなす硬ゴム部6aと、硬ゴム部6aの内側斜辺8a及び外側斜辺8bを覆う軟ゴム部6bとからなる。
頂点7における、軟ゴム部6bのタイヤ幅方向に対するタイヤ内側の厚さt1とタイヤ外側の厚さt2は、タイヤ外側の厚さt2の方が厚く設定されている。
また、図3に示すように、カーカス2には、補強材として、ワイヤチェーファ9、ナイロンチェーファ10、ゴムチェーファ11が順に巻きついている。 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 3 is a cross-sectional view in the tire width direction of a bead portion of a pneumatic tire (hereinafter referred to as “tire”) according to an embodiment of the present invention. As shown in FIG. 3, the tire has a bead portion 1a wound around the bead core 1 and the bead core 1 from the inner side to the outer side in the tire width direction and wound to the outer surface in the tire radial direction of the bead core 1, as shown in FIG. It has a bead structure with carcass 2. The bead portion further has a bead filler 6 having a cross-sectional triangle shape having a base 3 arranged along the winding portion 2a of the carcass 2 and an inner hypotenuse 5a and an outer hypotenuse 5b that intersect at the apex 4 facing the base 3. is doing.
The bead filler 6 covers a hard rubber portion 6a having a triangular cross section having an inner hypotenuse 8a and an outer hypotenuse 8b that intersect at a base 3 and a vertex 7 facing the base 3, and an inner hypotenuse 8a and an outer hypotenuse 8b of the hard rubber portion 6a. It consists of a soft rubber part 6b.
At the vertex 7, the tire inner thickness t1 and the tire outer thickness t2 with respect to the tire width direction of the soft rubber portion 6b are set so that the tire outer thickness t2 is thicker.
Further, as shown in FIG. 3, a wire chafer 9, a nylon chafer 10, and a rubber chafer 11 are wound around the carcass 2 in this order as reinforcing materials.

このような構成によると、まず、従来のタイヤのビード部と同様に硬ゴムと軟ゴムを併用しているため、硬ゴムでビード部の剛性を上げ、操縦安定性を向上させつつ、軟ゴムで車両の乗り心地も向上させ、両者のバランスをとることで、操縦安定性と乗り心地を両立させることができる。   According to such a configuration, first, since hard rubber and soft rubber are used in the same manner as the bead portion of the conventional tire, the soft rubber increases the rigidity of the bead portion with hard rubber and improves the steering stability. By improving the ride comfort of the vehicle and balancing the two, it is possible to achieve both steering stability and ride comfort.

また、硬ゴム部6aが軟ゴム部6bに覆われた構造となっているため、タイヤ幅方向内側において、カーカス2は、ビードフィラ6の硬ゴム部6aとは直接的には接せず、軟ゴム部6bと接するため、ビードフィラ6とカーカス2との間の応力を緩和して、応力による歪みを緩和させて、セパレーションを防止し、ビード耐久性を向上させることができる。 In addition, since the hard rubber portion 6a is covered with the soft rubber portion 6b, the carcass 2 does not directly contact the hard rubber portion 6a of the bead filler 6 on the inner side in the tire width direction. Since it is in contact with the rubber part 6b, the stress between the bead filler 6 and the carcass 2 can be relaxed, strain due to the stress can be relaxed, separation can be prevented, and bead durability can be improved.

さらに、図3に示すように、頂点7における、軟ゴム部6bのタイヤ幅方向に対するタイヤ外側の厚さt2をタイヤ内側の厚さt1より厚くすることによって、歪みの影響の出やすいタイヤ外側における応力による歪みを効果的に防止することができる。
また、タイヤが外側に倒れこもうとする場合に、剛性の高い硬ゴム部6aがタイヤ内側に近いことにより、タイヤ外側への倒れこみを支える効果が高くなる。 Further, as shown in FIG. 3, at the apex 7, the tire outer thickness t2 with respect to the tire width direction of the soft rubber portion 6b is made thicker than the tire inner thickness t1, so that on the outer side of the tire that is easily affected by distortion. Distortion due to stress can be effectively prevented.
Further, when the tire is about to fall outside, the hard rubber portion 6a having high rigidity is close to the inside of the tire, so that the effect of supporting the falling toward the outside of the tire is enhanced.

さらにまた、図2に示すタイプのビード部を有する従来のタイヤでは、ゴムシートを新たな部材として使用しており、生産性の悪化やエア入りが懸念されるのに対し、本発明にかかる図3に示すビード部では新たな部材を必要としないため、かような欠点が改善される。 Furthermore, in the conventional tire having a bead portion of the type shown in FIG. 2, a rubber sheet is used as a new member, and there is a concern about the deterioration of productivity and the entry of air. Since the bead part shown in 3 does not require a new member, such a defect is improved.

また、図3ではカーカス2がビードコア1に巻き付いた構造を例に挙げているが、本発明はそれに限定されるものではなく、カーカス2がタイヤ幅方向内側から外側に折り返された構造の場合においても本発明の構造を採用できる。この場合は、図4に示すように、ビードコア1に沿ってタイヤ幅方向内側から外側に折り返される、折り返し部2bを有するカーカス2を備えたタイヤのビード部において、ビードフィラ6の底辺3がビードコア1のタイヤ径方向外面に沿って配置された構造となる点で、図3の場合の構造と異なるが、その他の点は同様である。
このようなカーカスが折り返された構造の場合も、同様の原理によって、操縦安定性と乗り心地を両立させ、歪みの影響の出やすいタイヤ外側における応力による歪みを効果的に防止し、タイヤ外側への倒れこみを支える効果が高め、生産性の悪化やエア入りを回避することができる。 Further, in FIG. 3, the structure in which the carcass 2 is wound around the bead core 1 is taken as an example, but the present invention is not limited thereto, and in the case of the structure in which the carcass 2 is folded back from the inner side in the tire width direction. Can adopt the structure of the present invention. In this case, as shown in FIG. 4, in the bead portion of the tire including the carcass 2 having the folded portion 2b that is folded back from the inner side in the tire width direction along the bead core 1, the bottom 3 of the bead filler 6 is the bead core 1. 3 is different from the structure in the case of FIG. 3 in that the structure is arranged along the outer surface in the tire radial direction, but the other points are the same.
In the case of such a folded carcass structure, the same principle is used to achieve both steering stability and ride comfort, effectively preventing distortion due to stress on the outside of the tire that is susceptible to distortion, and to the outside of the tire. The effect of supporting the fall of the product is enhanced, and it is possible to avoid the deterioration of productivity and the entry of air.

ところで本発明において、硬ゴム部6aは、図3及び図4に示すように外側斜辺8bが三角形状の内部に凸に屈折した形状をなすことが好ましい。   In the present invention, it is preferable that the hard rubber portion 6a has a shape in which the outer hypotenuse 8b is refracted into a triangular shape as shown in FIGS.

また、図3のカーカスが巻き込み部を有するタイプの構造の場合、硬ゴム部6aは、底辺3が巻き込み部2aに該巻き込み部2aの端部まで沿って延び、該端部付近において、底辺3は屈折し、ビードコア1に直接接する形状であることが好ましい。
同様に図4のカーカスが折り返し部を有するタイプの構造の場合、硬ゴム部6aは、底辺3がビードコア1のタイヤ径方向外側面におけるタイヤ幅方向内側の端部まで沿って延び、該端部付近において、底辺3は屈折し、ビードコア1に直接接する形状であることが好ましい。 Further, in the case of the type of structure in which the carcass of FIG. 3 has a winding portion, the hard rubber portion 6a has a bottom 3 extending along the winding portion 2a along the end of the winding portion 2a, and in the vicinity of the end, the bottom 3 Is preferably refracted and in direct contact with the bead core 1.
Similarly, in the case of the structure in which the carcass of FIG. 4 has a folded portion, the hard rubber portion 6a has a base 3 extending along an end in the tire width direction on the outer side in the tire radial direction of the bead core 1, and the end In the vicinity, the base 3 is preferably refracted and directly in contact with the bead core 1.

なお、硬ゴムと軟ゴムの2種類のゴムを用いたビードフィラを形成するためには、シングルチューバーを2台組み合わせた複合押出機である、デュアルチューバーを用いることができる。 In order to form a bead filler using two types of rubber, hard rubber and soft rubber, a dual tuber, which is a composite extruder combining two single tubers, can be used.

次に、従来技術のタイヤと本発明のタイヤでビード剛性及びビード耐久性に差があることを確認するための試験を行った。
発明例1として、図3に示すタイプのタイヤ、すなわち、カーカスが巻き込み部を有するタイプのビード構造で、ビードフィラの軟ゴム部をV字型にして、軟ゴム部が断面三角形状の硬ゴム部覆うようにし、さらに、図3の頂点7における軟ゴム部のタイヤ幅方向に対するタイヤ外側の厚さt2をタイヤ内側の厚さt1より厚くしたタイヤを試作した。また、発明例2として、図4に示すタイプのタイヤ、すなわち、カーカスがタイヤ幅方向内側から外側に折り返された構造で、軟ゴムのビードフィラをV字型にして、軟ゴム部が断面三角形状の硬ゴム部を覆うようにし、さらに、図4の頂点7における軟ゴム部のタイヤ幅方向に対するタイヤ外側の厚さt2をタイヤ内側の厚さt1より厚くしたタイヤを試作した。
比較例1として、図2に示すタイプのタイヤ、すなわち、硬ゴムのタイヤ幅方向外側に軟ゴム、内側にゴムシートを埋設したタイヤを試作した。また、比較例2として、図1に示すタイプのタイヤ、すなわち、硬ゴムのタイヤ幅方向外側に軟ゴムを埋設したタイヤを試作した。 Next, a test was performed to confirm that there is a difference in bead rigidity and bead durability between the tire of the prior art and the tire of the present invention.
Inventive example 1 is a tire of the type shown in FIG. 3, that is, a bead structure in which the carcass has a entangled portion, the bead filler has a V-shaped soft rubber portion, and the soft rubber portion has a triangular cross section. Further, a tire was manufactured as a trial in which the thickness t2 on the tire outer side in the tire width direction of the soft rubber portion at the apex 7 in FIG. 3 was larger than the thickness t1 on the tire inner side. Further, as Invention Example 2, the type of tire shown in FIG. 4, that is, a structure in which the carcass is folded from the inner side to the outer side in the tire width direction, the soft rubber bead filler is V-shaped, and the soft rubber part has a triangular cross section Further, a tire was manufactured in which the thickness t2 of the tire outer side in the tire width direction of the soft rubber portion at the vertex 7 in FIG. 4 was made thicker than the thickness t1 of the tire inner side.
As Comparative Example 1, a tire of the type shown in FIG. 2, that is, a tire in which soft rubber is embedded on the outer side in the tire width direction of the hard rubber and a rubber sheet is embedded on the inner side, was manufactured. Further, as Comparative Example 2, a tire of the type shown in FIG. 1, that is, a tire in which soft rubber was embedded on the outer side in the tire width direction of a hard rubber was prototyped.

ビード剛性及びビード耐久性を向上したタイヤを製造して、市場に提供できる。   Tires with improved bead rigidity and bead durability can be manufactured and provided to the market.

1 ビードコア
2 カーカス
2a 巻き込み部
2b 折り返し部
3 底辺
4 頂点
5a 内側斜辺
5b 外側斜辺
6 ビードフィラ
6a 硬ゴム部
6b 軟ゴム部
7 硬ゴム部の頂点
8a 硬ゴム部の内側斜辺
8b 硬ゴム部の外側斜辺
9 ワーヤチェーファ
10 ナイロンチェーファ
11 ゴムチェーファ
12 サイドウォール
A 応力集中点
B ゴムシート
C エア
D 屈折点
E 屈折点
t1 硬ゴム部の頂点におけるタイヤ幅方向内側の厚さ
t2 硬ゴム部の頂点におけるタイヤ幅方向外側の厚さ
t3 屈折点Dにおけるタイヤ幅方向内側の厚さ
t4 屈折点Dにおけるタイヤ幅方向外側の厚さ 1 Bead core
2 Carcass
2a Entrainment part
2b Folding part
3 Bottom
4 vertex
5a Inner hypotenuse
5b Outside hypotenuse
6 Bead Filler
6a Hard rubber part
6b Soft rubber part
7 Top of hard rubber part
8a Inside hypotenuse of hard rubber part
8b Outside hypotenuse of hard rubber part
9 Wayachefa
10 Nylon chafer
11 Rubber chafer
12 sidewall
A Stress concentration point
B Rubber sheet
C Air
D Refraction point
E Refraction point
t1 Thickness inside tire width direction at top of hard rubber part
t2 Thickness on the outer side in the tire width direction at the top of the hard rubber part
t3 Thickness inside tire width direction at refraction point D
t4 Thickness outside the tire width direction at refraction point D

Claims (3)

一対のビードコア間をトロイダル状に跨るカーカス本体部及び該カーカス本体部から前記ビードコアに沿ってタイヤ幅方向内側から外側に巻き回され、少なくとも前記ビードコアのタイヤ径方向外側面まで巻き付けられた巻き込み部を有するカーカスを備え、前記ビードコアのタイヤ径方向外側にタイヤ幅方向断面が三角形状のビードフィラを有する空気入りタイヤであって、
前記ビードフィラは、タイヤ幅方向断面において、底辺が前記巻き込み部に沿って配置され、該底辺に対向する頂点がタイヤ径方向外方にある三角形状の硬質のゴム部と、タイヤ幅方向断面において該硬質のゴム部の前記底辺に隣接する2つの辺を覆う軟質のゴム部とからなる、空気入りタイヤ。 A carcass body portion straddling a pair of bead cores in a toroidal shape, and a winding portion wound from the carcass body portion along the bead core from the inner side to the outer side in the tire width direction and at least wound to the outer side surface in the tire radial direction of the bead core. A pneumatic tire having a bead filler having a triangular cross section in the tire width direction on the outer side in the tire radial direction of the bead core,
The bead filler has a triangular hard rubber portion whose bottom is disposed along the entangled portion in the tire width direction cross section, and whose apex opposite to the bottom is radially outward of the tire, and in the tire width direction cross section, A pneumatic tire comprising a soft rubber portion covering two sides adjacent to the bottom side of the hard rubber portion. 一対のビードコア間をトロイダル状に跨るカーカス本体部及び該カーカス本体部から前記ビードコアに沿ってタイヤ幅方向内側から外側に折り返される、折り返し部を有するカーカスを備え、前記ビードコアのタイヤ径方向外側にタイヤ幅方向断面が三角形状のビードフィラを有する空気入りタイヤであって、
前記ビードフィラは、タイヤ幅方向断面において、底辺が前記ビードコアのタイヤ径方向外面に沿って配置され、該底辺に対向する頂点がタイヤ径方向外方にある三角形状の硬質のゴム部と、タイヤ幅方向断面において該硬質のゴム部の前記底辺に隣接する2つの辺を覆う軟質のゴム部とからなる、空気入りタイヤ。 A carcass body portion straddling a pair of bead cores in a toroidal shape, and a carcass having a turn-up portion that is folded back from the carcass body portion along the bead core from the inside to the outside in the tire width direction, and the tire on the tire radial outside of the bead core A pneumatic tire having a bead filler having a triangular cross section in the width direction,
The bead filler, in a tire width direction cross section, a bottom is disposed along the tire radial outer surface of the bead core, and a triangular hard rubber portion whose apex facing the bottom is outward in the tire radial direction, and a tire width A pneumatic tire comprising a soft rubber portion covering two sides adjacent to the bottom side of the hard rubber portion in a directional cross section. 前記頂点における、前記軟質のゴム部のタイヤ幅方向に対するタイヤ内側の厚さとタイヤ外側の厚さは、タイヤ外側の方が厚く設定されていることを特徴とする、請求項1又は2に記載の空気入りタイヤ。 The tire inner thickness and the tire outer thickness with respect to the tire width direction of the soft rubber portion at the apex are set to be thicker on the tire outer side, according to claim 1 or 2. Pneumatic tire.
JP2011033950A 2011-02-18 2011-02-18 Pneumatic tire Expired - Fee Related JP5771408B2 (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03248903A (en) * 1990-02-26 1991-11-06 Sumitomo Rubber Ind Ltd Pneumatic tire
JPH0411505A (en) * 1990-04-30 1992-01-16 Sumitomo Rubber Ind Ltd Pneumatic tire
JPH05139125A (en) * 1991-11-20 1993-06-08 Ohtsu Tire & Rubber Co Ltd :The Pneumatic radial tire
JPH07149117A (en) * 1993-11-30 1995-06-13 Toyo Tire & Rubber Co Ltd Pneumatic tire
JPH1076820A (en) * 1996-09-03 1998-03-24 Bridgestone Corp Pneumatic radial tire
JP2000142040A (en) * 1998-11-10 2000-05-23 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2001018619A (en) * 1999-07-02 2001-01-23 Bridgestone Corp Pneumatic tire excellent in bead part durability
JP2003291613A (en) * 2002-04-01 2003-10-15 Sumitomo Rubber Ind Ltd Pneumatic tire

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03248903A (en) * 1990-02-26 1991-11-06 Sumitomo Rubber Ind Ltd Pneumatic tire
JPH0411505A (en) * 1990-04-30 1992-01-16 Sumitomo Rubber Ind Ltd Pneumatic tire
JPH05139125A (en) * 1991-11-20 1993-06-08 Ohtsu Tire & Rubber Co Ltd :The Pneumatic radial tire
JPH07149117A (en) * 1993-11-30 1995-06-13 Toyo Tire & Rubber Co Ltd Pneumatic tire
JPH1076820A (en) * 1996-09-03 1998-03-24 Bridgestone Corp Pneumatic radial tire
JP2000142040A (en) * 1998-11-10 2000-05-23 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2001018619A (en) * 1999-07-02 2001-01-23 Bridgestone Corp Pneumatic tire excellent in bead part durability
JP2003291613A (en) * 2002-04-01 2003-10-15 Sumitomo Rubber Ind Ltd Pneumatic tire

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