JPH09132012A - Heavy loading pneumatic tire - Google Patents

Heavy loading pneumatic tire

Info

Publication number
JPH09132012A
JPH09132012A JP7288740A JP28874095A JPH09132012A JP H09132012 A JPH09132012 A JP H09132012A JP 7288740 A JP7288740 A JP 7288740A JP 28874095 A JP28874095 A JP 28874095A JP H09132012 A JPH09132012 A JP H09132012A
Authority
JP
Japan
Prior art keywords
bead
tire
rubber
hard rubber
outer skin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7288740A
Other languages
Japanese (ja)
Inventor
Toshifumi Ikuno
敏文 生野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP7288740A priority Critical patent/JPH09132012A/en
Publication of JPH09132012A publication Critical patent/JPH09132012A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To prevent the bead part of the heavy loading pneumatic tire used for a truck, a bus and the like from being apt to cause damage by vehicle running. SOLUTION: Outer surface rubber 2 enclosing the whole or a part of a bead part 1 including at least an area starting from a bead heel part to a bead toe part, is formed by the bead toe part 3, a bead outer skin part 4 and a bead inner skin part 5, which are divided by the aforesaid bead toe part, hard rubber is allocated in the bead outer skin part 4, and concurrently hard rubber is also allocated in the bead inner skin part 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、トラックやバス等
に使用される重荷重用空気入りタイヤに関するものであ
り、特に走行によって生じがちなビード部の損傷を防止
することにある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy duty pneumatic tire used for trucks, buses and the like, and particularly to prevent damage to the bead portion which tends to occur during running.

【0002】[0002]

【従来の技術】タイヤのビード部、より詳細にはビード
部の外面ゴムを構成するビード外皮部は、主にタイヤを
ホイールに組み付けたときのリムとの接触部分であり、
タイヤのビード外皮部とこれに接触するリム部分との間
で生じる密着力を利用して、タイヤをホイールと緊密一
体化し、これによってタイヤ車輪を形成する。
2. Description of the Related Art A bead portion of a tire, more specifically, a bead skin portion that constitutes an outer rubber surface of the bead portion is a contact portion with a rim when the tire is mainly assembled to a wheel,
The adhesion between the bead skin of the tire and the rim portion that contacts it is utilized to tightly integrate the tire with the wheel, thereby forming a tire wheel.

【0003】しかし、このようにして形成したタイヤ車
輪は、主にゴム材料からなるタイヤと、アルミニウム等
の金属材料からなるホイールとの異種材料同士で構成さ
れているため、路面を走行するとき、タイヤのビード部
はリムと路面とで挟まれるごとに大きく変形し、このと
き、リムと路面との位置にずれが生じるようになり、こ
の結果、リムと路面との間に挟まれた前記ビード部に
は、図3に示すように、タイヤ周方向に剪断力10が作
用することによって歪み(以下、「周方向歪み」とい
う。)が生じ、この周方向歪みは大きくなるほど、プラ
イ端でセパレーションやクラック等の故障が生じやすく
なり、ビード部が損傷するおそれがある。特に、重荷重
用タイヤの場合には大きな周方向歪みが生じやすく、ビ
ード部の損傷も起こりやすくなる。
However, since the tire wheel thus formed is composed of different materials, that is, a tire mainly made of a rubber material and a wheel made of a metal material such as aluminum, when traveling on a road surface, The bead portion of the tire is largely deformed each time it is sandwiched between the rim and the road surface, and at this time, the position of the rim and the road surface is displaced, and as a result, the bead sandwiched between the rim and the road surface is generated. As shown in FIG. 3, the portion is distorted by the shearing force 10 acting in the tire circumferential direction (hereinafter, referred to as “circumferential strain”). As the circumferential strain increases, the separation at the ply end increases. Failures such as cracks and cracks are likely to occur, and the bead portion may be damaged. Particularly in the case of heavy-duty tires, large circumferential strain is likely to occur, and the bead portion is likely to be damaged.

【0004】周方向歪みを小さくしてビード部の損傷を
防止する手段としては、従来は、リム部分と接触するタ
イヤのビード外皮部に、ワイヤーやナイロン等の補強素
子をゴム引きした補強チェーファーを配置して、リムに
対するビード部の変形量の差を極力なくす方法が一般的
であったが、補強チェーファーの配置は、重量やコスト
をかなり増加させることになるので、最近では、図2に
示すように、ビード部の1′の外面ゴム2′を構成する
ビード外皮部4′には、補強チェーファーの代わりに、
できるだけ硬質なゴムのみからなるゴムチェーファーを
配置することが主流になりつつある。
Conventionally, as a means for reducing the circumferential strain to prevent damage to the bead portion, a reinforcing chafer in which a bead outer skin portion of a tire which comes into contact with a rim portion is rubberized with a reinforcing element such as wire or nylon. Was generally used to minimize the difference in the amount of deformation of the bead portion with respect to the rim. However, since the arrangement of the reinforcing chafer significantly increases the weight and cost, recently, as shown in FIG. As shown in, the bead skin portion 4'constituting the outer surface rubber 2'of the bead portion 1'has, instead of the reinforcing chafer,
It is becoming mainstream to arrange a rubber chafer made of only hard rubber.

【0005】[0005]

【発明が解決しようとする課題】発明者は、周方向歪み
を小さくする検討をさらに進めたところ、硬質ゴムを、
リム部分と接触するタイヤのビード外皮部ばかりでな
く、ビード内皮部にも配置することによって周方向歪み
を大幅に低減できることを見出した。
DISCLOSURE OF INVENTION Problems to be Solved by the Invention The present inventor has further studied to reduce circumferential strain, and
It has been found that the circumferential strain can be significantly reduced by disposing not only the bead outer skin portion of the tire that comes into contact with the rim portion but also the bead inner skin portion.

【0006】本発明の目的は、少なくともビードヒール
部からビードトゥ部の領域を含むビード部の全体又は一
部を包み込む外面ゴムを、ゴム硬さの異なる少なくとも
二種類のゴムで形成し、これらのゴムを適正配置するこ
とによって、走行時にリムと路面とで挟まれたビード部
に生じる周方向歪みを低減し、ビード部の損傷が生じに
くい重荷重用空気入りタイヤを提供することにある。
An object of the present invention is to form an outer surface rubber enclosing the whole or a part of a bead portion including at least a region from a bead heel portion to a bead toe portion by using at least two kinds of rubbers having different rubber hardness, and these rubbers The object of the present invention is to provide a heavy-duty pneumatic tire in which the bead portion, which is sandwiched between the rim and the road surface during traveling, can be reduced in circumferential direction by proper placement, and the bead portion is unlikely to be damaged.

【0007】[0007]

【課題を解決するための手段】上記目的を達成するた
め、本発明の重荷重用空気入りタイヤは、少なくともビ
ードヒール部からビードトゥ部の領域を含むビード部の
全体又は一部を包み込む外面ゴムを、ビードトゥ部と、
これによって区分されたビード外皮部とビード内皮部と
で形成してなり、ビード外皮部に硬質ゴムを配置してな
り、ビード内皮部に硬質ゴムを配置する。また、ビード
外皮部に配置する硬質ゴムは、そのタイプAデュロメー
タで測定したゴム硬さが60〜90の範囲であり、ビード内
皮部に配置する硬質ゴムは、そのタイプAデュロメータ
で測定したゴム硬さが60〜90の範囲であることが好まし
い。なお、タイプAデュロメータ硬さの測定について
は、JIS K6253 に規定されている方法によって行った。
In order to achieve the above object, the heavy-duty pneumatic tire of the present invention comprises a bead toe with an outer rubber wrapping at least a part of the bead including the region from the bead heel to the bead toe. Department,
It is formed by the bead outer skin portion and the bead inner skin portion divided by this, the hard rubber is arranged in the bead outer skin portion, and the hard rubber is arranged in the bead inner skin portion. The hard rubber placed on the bead skin has a rubber hardness measured by the type A durometer in the range of 60 to 90, and the hard rubber placed on the bead inner skin is measured by the type A durometer. Is preferably in the range of 60 to 90. The type A durometer hardness was measured by the method specified in JIS K6253.

【0008】さらに、タイヤの幅方向断面にて、ビード
外皮部の表面に設けたリムライン位置Aを通り、カーカ
ス本体部のカーカスラインに対し直交する方向に引いた
仮想線mとビード内皮部の表面との交点位置をBとすれ
ば、ビード外皮部に配置した硬質ゴムのタイヤ径方向外
端縁は、リムライン位置よりもタイヤ径方向外方に位置
し、かつ、ビード外皮部の表面に沿ってリムライン位置
Aから測った距離が10〜100 mmの範囲内にあり、ビー
ド内皮部に配置した硬質ゴムのタイヤ径方向外端縁は、
前記交点位置よりもタイヤ径方向外方に位置し、かつ、
ビード内皮部の表面に沿って前記交点位置から測った距
離が10〜100 mmの範囲内にあることがより好ましい。
なお、ここでいうリムラインとは、リム組の際、ビード
が正確に上がっているか(フィットしているか)を確認
する為のラインをいう。
Further, in the widthwise cross section of the tire, a virtual line m passing through the rim line position A provided on the surface of the bead outer skin portion and a direction perpendicular to the carcass line of the carcass body and the surface of the bead inner skin portion. Let B be the position of the intersection with and the tire radial outer edge of the hard rubber placed in the bead outer skin is located further outward in the tire radial direction than the rim line position, and along the surface of the bead outer skin. The distance measured from the rim line position A is within the range of 10 to 100 mm, and the tire radial outer edge of the hard rubber arranged in the bead inner part is
Located outside the intersection in the tire radial direction, and
It is more preferable that the distance measured from the position of the intersection along the surface of the bead endothelium is within the range of 10 to 100 mm.
In addition, the rim line referred to here is a line for confirming whether the bead is accurately raised (fitted) when the rim is assembled.

【0009】[0009]

【発明の実施の形態】図1に、本発明に従う重荷重用空
気入りタイヤのビード部の代表的な要部断面を示し、図
中1はビード部、2は外面ゴム、3はビードトゥ部、4
はビード外皮部、5はビード内皮部である。この重荷重
用空気入りタイヤは、少なくともビードヒール部からビ
ードトゥ部の領域を含むビード部の全体又は一部を包み
込む外面ゴム2を、ビードトゥ部3と、これによって区
分されたビード外皮部4とビード内皮部5とで形成して
なり、ビード外皮部4に、硬質ゴムを配置するととも
に、ビード内皮部5にも硬質ゴムを配置する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a typical cross section of a main part of a bead portion of a heavy duty pneumatic tire according to the present invention. In the figure, 1 is a bead portion, 2 is an outer rubber, 3 is a bead toe portion, 4
Is a bead outer skin portion, and 5 is a bead inner skin portion. This heavy-duty pneumatic tire includes a bead toe portion 3, an outer surface rubber 2 that encloses the bead toe portion in whole or in part including at least a bead heel portion to a bead toe portion, and a bead outer skin portion 4 and a bead inner skin portion divided by the bead toe portion 3. 5, the hard rubber is arranged on the bead outer skin portion 4, and the hard rubber is also arranged on the bead inner skin portion 5.

【0010】具体的には、ビード外皮部4に配置する硬
質ゴムのゴム硬さは、60〜90の範囲にし、ビード内皮部
5に配置する硬質ゴムのゴム硬さは、60〜90の範囲にす
ることが好ましい。これらの硬質ゴムのゴム硬さが、そ
れぞれ上記範囲よりも小さい場合には、ビード部に生じ
る周方向歪みを十分に低減することができず、また、上
記範囲よりも大きい場合には、割れ、欠けを生じる。
Specifically, the hardness of the hard rubber placed in the bead outer skin portion 4 is in the range of 60 to 90, and the hardness of the hard rubber placed in the bead inner skin portion 5 is in the range of 60 to 90. Is preferred. If the rubber hardness of these hard rubbers is smaller than the above range, respectively, it is not possible to sufficiently reduce the circumferential strain generated in the bead portion, and if it is larger than the above range, cracking, Causes chipping.

【0011】なお、ビード外皮部4とビード内皮部5に
配置した硬質ゴムには同じものを用いても異なるものを
用いてもよく、必要に応じて適宜選択することができ
る。また、ビードトゥ部3には、トゥ欠け防止のため、
軟質ゴムを配置することが好ましく、具体的には、ビー
ドトゥ部3に配置した軟質ゴムのゴム硬さは、45〜75の
範囲にすることが好ましい。
The hard rubbers disposed on the bead outer skin portion 4 and the bead inner skin portion 5 may be the same or different, and can be appropriately selected according to need. In addition, in the bead toe part 3, in order to prevent toe chipping,
It is preferable to arrange the soft rubber, and specifically, the rubber hardness of the soft rubber arranged in the bead toe portion 3 is preferably in the range of 45 to 75.

【0012】さらに、タイヤの幅方向断面にて、ビード
外皮部4の表面4bに設けたリムライン位置Aを通り、
カーカス本体部6のカーカスライン7に対し直交する方
向に引いた仮想線mとビード内皮部の表面5bとの交点
位置をBとすれば、ビード外皮部4に配置した硬質ゴム
のタイヤ径方向外端縁4aは、リムライン位置Aよりも
タイヤ径方向外方に位置し、かつ、ビード外皮部4の表
面4bに沿ってリムライン位置Aから測った距離が10〜
100 mmの範囲内に配置し、ビード内皮部5に配置した
硬質ゴムのタイヤ径方向外端縁5aは、前記交点位置B
よりもタイヤ径方向外方に位置し、かつ、ビード内皮部
5の表面5bに沿って前記交点位置Bから測った距離が
10〜100 mmの範囲内に配置することがより好ましい。
ビード外皮部4のタイヤ径方向外端縁4a及びビード内
皮部5のタイヤ径方向外端縁5aを上記範囲内にそれぞ
れ配置することによって、周方向歪みを大幅に低減する
ことができる。
Further, in the widthwise cross section of the tire, it passes through a rim line position A provided on the surface 4b of the bead outer skin 4,
Let B be the intersection point between the imaginary line m of the carcass body portion 6 that is drawn in a direction orthogonal to the carcass line 7 and the surface 5b of the bead inner skin portion. The end edge 4a is located further outward in the tire radial direction than the rim line position A, and the distance measured from the rim line position A along the surface 4b of the bead skin portion 4 is 10 to 10.
The tire radial outer edge 5a of the hard rubber arranged within the range of 100 mm and arranged on the bead inner skin portion 5 has the intersection position B
Is located further outward in the tire radial direction, and the distance measured from the intersection point B along the surface 5b of the bead inner skin portion 5 is
More preferably, it is arranged within the range of 10 to 100 mm.
By arranging the tire radial outer edge 4a of the bead outer skin portion 4 and the tire radial outer edge 5a of the bead inner skin portion 5 within the above ranges, circumferential strain can be significantly reduced.

【0013】[0013]

【実施例】次に、本発明の実施例を図面を参照しながら
説明する。 ・発明タイヤ 発明タイヤは、図1に示すビード部断面を有し、タイヤ
サイズが295/75R22.5であり、ビード部1の一部を包み
込む外面ゴム2を、ビードトゥ部3と、これによって区
分されたビード外皮部4とビード内皮部5とで形成して
なり、ビードトゥ部3には、ゴム硬さが60である軟質ゴ
ムを、ビード外皮部4には、ゴム硬さが75である硬質ゴ
ムを、そしてビード内皮部5には、ゴム硬さが75である
硬質ゴムをそれぞれ配置した。ビード外皮部4に配置し
た硬質ゴムのタイヤ径方向外端縁4a位置は、リムライ
ン位置Aから、ビード外皮部4の表面4bに沿って30m
mだけタイヤ径方向外方に離れて配置し、ビード内皮部
5に配置した硬質ゴムのタイヤ径方向外端縁5a位置
は、前記交点位置Bから、ビード内皮部5の表面5bに
沿って30mmだけタイヤ径方向外方に離れて配置した。
なお、その他のタイヤ部分は、従来のトラック・バス用
のタイヤと同等のものを使用した。
Next, embodiments of the present invention will be described with reference to the drawings. -Invention tire The invention tire has the bead section cross section shown in Fig. 1, the tire size is 295 / 75R22.5, and the outer rubber 2 that wraps a part of the bead section 1 is divided into the bead toe section 3 and the bead toe section 3. The bead outer skin portion 4 and the bead inner skin portion 5 form a soft rubber having a rubber hardness of 60 in the bead toe portion 3 and a hard rubber having a rubber hardness of 75 in the bead outer skin portion 4. A rubber and a hard rubber having a rubber hardness of 75 were arranged on the bead inner skin portion 5, respectively. The tire radial outer edge 4a position of the hard rubber arranged on the bead outer skin portion 4 is 30 m from the rim line position A along the surface 4b of the bead outer skin portion 4.
The tire radial outer edge 5a position of the hard rubber disposed on the bead inner skin portion 5 by being separated from the outer diameter direction by m, is 30 mm from the intersection point B along the surface 5b of the bead inner skin portion 5. Only, they are arranged away from each other in the radial direction of the tire.
The other tires used were the same as the conventional tires for trucks and buses.

【0014】・従来タイヤ 従来タイヤは、図2 に示すビード部断面を有し、タイヤ
サイズが295/75R22.5であり、ビード部1の一部を包み
込む外面ゴム2を、ビードトゥ部3とビード外皮部4と
で形成してなり、ビード内皮部5には外面ゴムを有して
いない。ビードトゥ部3には、ゴム硬さが60である軟質
ゴムを、ビード外皮部4には、ゴム硬さが75である硬質
ゴムをそれぞれ配置した。ビード外皮部4に配置した硬
質ゴムのタイヤ径方向外端縁4a位置は、リムライン位
置Aから、ビード外皮部4の表面4bに沿って30mmだ
けタイヤ径方向外方に離れて配置した。その他のタイヤ
部分は、発明タイヤと同じものを使用した。
Conventional tire A conventional tire has a bead section cross section shown in FIG. 2, a tire size is 295 / 75R22.5, and an outer rubber 2 that encloses a part of the bead section 1, a bead toe section 3 and a bead section. It is formed by the outer skin portion 4, and the bead inner skin portion 5 has no outer surface rubber. A soft rubber having a rubber hardness of 60 was arranged in the bead toe portion 3, and a hard rubber having a rubber hardness of 75 was arranged in the bead outer skin portion 4. The position of the tire outer radial edge 4a of the hard rubber arranged in the bead outer skin portion 4 was located 30 mm away from the rim line position A along the front surface 4b of the bead outer skin portion 4 in the tire radial direction. The other tire parts were the same as those of the invention tire.

【0015】・試験方法 試験は、上記各供試タイヤを、サイズが8.25×22.5であ
る適用リムに組み付けてタイヤ車輪とし、このタイヤ車
輪は、タイヤ内圧を7.75kgf/cm2,タイヤ荷重をJATMA で
規定されている負荷能力の200%とする条件の下、60km/h
の速度でドラム上で負荷転動させ、ビード部の一部分が
破壊した時の走行距離を測定し、これによって、ビード
部の耐久性を評価した。表1にその結果を示す。なお、
表中の数値は、従来タイヤを100 とした指数比で示して
おり、大きいほどビード部の耐久性が優れている。
Test method In the test, each of the above-mentioned test tires was mounted on an applicable rim having a size of 8.25 × 22.5 to form a tire wheel, and the tire wheel had a tire internal pressure of 7.75 kgf / cm 2 and a tire load of JATMA. 60 km / h under the condition of 200% of the load capacity specified in
The rolling distance was measured by rolling the load on the drum at a speed of 1 to measure the running distance when a part of the bead portion was broken, and the durability of the bead portion was evaluated by this. The results are shown in Table 1. In addition,
The numerical values in the table are shown as an index ratio with the conventional tire as 100. The larger the value, the better the durability of the bead.

【0016】[0016]

【表1】 [Table 1]

【0017】表1の結果から、発明タイヤは、従来タイ
ヤに比し、ビード部の耐久性が優れている。
From the results shown in Table 1, the invention tire is superior in durability to the bead portion as compared with the conventional tire.

【0018】[0018]

【発明の効果】本発明によれば、重量やコスト等の増加
を伴う補強チェーファーを配置することなく、ビード部
の損傷を大幅に低減させた重荷重用空気入りタイヤの提
供が可能になった。
According to the present invention, it is possible to provide a heavy-duty pneumatic tire in which damage to the bead portion is greatly reduced without disposing a reinforcing chafer that causes an increase in weight and cost. .

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に従う代表的な空気入りタイヤのビード
部の要部断面図である。
FIG. 1 is a sectional view of a main part of a bead portion of a typical pneumatic tire according to the present invention.

【図2】従来タイヤのビード部の要部断面図である。FIG. 2 is a sectional view of a main part of a bead portion of a conventional tire.

【図3】タイヤが路面を走行する際に、リムと路面との
間に挟まれたタイヤ部分に剪断力が作用するのを説明す
る図である。
FIG. 3 is a diagram illustrating that a shearing force acts on a tire portion sandwiched between a rim and a road surface when the tire travels on the road surface.

【符号の説明】[Explanation of symbols]

1 ビード部 2 外面ゴム 3 ビードトゥ部 4 ビード外皮部 5 ビード内皮部 6 カーカス本体部 7 カーカスライン 8 タイヤの回転方向 9 路面 10 剪断力 1 bead part 2 outer rubber 3 bead toe part 4 bead outer part 5 bead inner part 6 carcass body part 7 carcass line 8 tire rotation direction 9 road surface 10 shear force

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 少なくともビードヒール部からビードト
ゥ部の領域を含むビード部の全体又は一部を包み込む外
面ゴムを、ビードトゥ部と、これによって区分されたビ
ード外皮部とビード内皮部とで形成してなり、ビード外
皮部に硬質ゴムを配置してなる重荷重用空気入りタイヤ
において、 ビード内皮部に硬質ゴムを配置することを特徴とする重
荷重用空気入りタイヤ。
1. An outer surface rubber enclosing the whole or a part of a bead portion including at least a region from a bead heel portion to a bead toe portion is formed of a bead toe portion and a bead outer skin portion and a bead inner skin portion divided by the bead toe portion. A heavy-duty pneumatic tire in which a hard rubber is arranged on a bead outer skin part, wherein the hard rubber is arranged on a bead inner skin part.
【請求項2】 ビード外皮部に配置する硬質ゴムは、そ
のタイプAデュロメータで測定したゴム硬さが60〜90の
範囲であり、ビード内皮部に配置する硬質ゴムは、その
タイプAデュロメータで測定したゴム硬さが60〜90の範
囲であることを特徴とする請求項1に記載の重荷重用空
気入りタイヤ。
2. The hard rubber arranged on the bead outer skin has a rubber hardness measured by a type A durometer in the range of 60 to 90, and the hard rubber arranged on the bead inner skin is measured by a type A durometer. The heavy-duty pneumatic tire according to claim 1, wherein the rubber hardness is in the range of 60 to 90.
【請求項3】 タイヤの幅方向断面にて、ビード外皮部
の表面に設けたリムライン位置(A)を通り、カーカス
本体部のカーカスラインに対し直交する方向に引いた仮
想線(m)とビード内皮部の表面との交点位置をBとす
れば、 ビード外皮部に配置した硬質ゴムのタイヤ径方向外端縁
は、リムライン位置(A)よりもタイヤ径方向外方に位
置し、かつ、ビード外皮部の表面に沿ってリムライン位
置(A)から測った距離が10〜100 mmの範囲内にあ
り、 ビード内皮部に配置した硬質ゴムのタイヤ径方向外端縁
は、前記交点位置(B)よりもタイヤ径方向外方に位置
し、かつ、ビード内皮部の表面に沿って前記交点位置
(B)から測った距離が10〜100 mmの範囲内にあるこ
とを特徴とする請求項1又は2に記載の重荷重用空気入
りタイヤ。
3. A imaginary line (m) drawn in a direction orthogonal to the carcass line of the carcass body through the rim line position (A) provided on the surface of the bead outer skin in the widthwise cross section of the tire and the bead. Assuming that the position of the intersection with the surface of the inner skin portion is B, the tire radial outer edge of the hard rubber disposed in the bead outer skin portion is located further outward in the tire radial direction than the rim line position (A), and The distance measured from the rim line position (A) along the surface of the outer skin portion is within the range of 10 to 100 mm, and the tire radial outer edge of the hard rubber disposed on the bead inner skin portion is the intersection point position (B). 2. The distance from the intersection point (B) along the surface of the bead endothelium portion is in the range of 10 to 100 mm, which is located further outward in the tire radial direction. The heavy duty pneumatic tire according to item 2.
JP7288740A 1995-11-07 1995-11-07 Heavy loading pneumatic tire Pending JPH09132012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7288740A JPH09132012A (en) 1995-11-07 1995-11-07 Heavy loading pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7288740A JPH09132012A (en) 1995-11-07 1995-11-07 Heavy loading pneumatic tire

Publications (1)

Publication Number Publication Date
JPH09132012A true JPH09132012A (en) 1997-05-20

Family

ID=17734086

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7288740A Pending JPH09132012A (en) 1995-11-07 1995-11-07 Heavy loading pneumatic tire

Country Status (1)

Country Link
JP (1) JPH09132012A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002052909A (en) * 2000-08-11 2002-02-19 Sumitomo Rubber Ind Ltd Heavy load radial tire
US7543620B2 (en) * 2003-03-31 2009-06-09 The Goodyear Tire & Rubber Company Tire bead geometry
FR2942745A1 (en) * 2009-03-04 2010-09-10 Michelin Soc Tech PNEUMATIC FOR HEAVY VEHICLE.
CN108705902A (en) * 2018-06-11 2018-10-26 中策橡胶集团有限公司 A kind of Pneumatic radial tire for heavy load tyre bead

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002052909A (en) * 2000-08-11 2002-02-19 Sumitomo Rubber Ind Ltd Heavy load radial tire
US7543620B2 (en) * 2003-03-31 2009-06-09 The Goodyear Tire & Rubber Company Tire bead geometry
FR2942745A1 (en) * 2009-03-04 2010-09-10 Michelin Soc Tech PNEUMATIC FOR HEAVY VEHICLE.
WO2010100102A1 (en) * 2009-03-04 2010-09-10 Societe De Technologie Michelin Tyre for a heavy vehicle
CN102341254A (en) * 2009-03-04 2012-02-01 米其林技术公司 Tyre for a heavy vehicle
JP2012519111A (en) * 2009-03-04 2012-08-23 ソシエテ ド テクノロジー ミシュラン Tires for heavy vehicles
US9744813B2 (en) 2009-03-04 2017-08-29 Compagnie Generale Des Etablissements Michelin Tire for a heavy vehicle
CN108705902A (en) * 2018-06-11 2018-10-26 中策橡胶集团有限公司 A kind of Pneumatic radial tire for heavy load tyre bead

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