JP3125454U - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP3125454U
JP3125454U JP2006005484U JP2006005484U JP3125454U JP 3125454 U JP3125454 U JP 3125454U JP 2006005484 U JP2006005484 U JP 2006005484U JP 2006005484 U JP2006005484 U JP 2006005484U JP 3125454 U JP3125454 U JP 3125454U
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tire
core
portions
carcass cord
width direction
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宗近 前嶋
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Yokohama Rubber Co Ltd
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Abstract

【課題】一対のコア部によってカーカスコードの端部を挟持する構造においても、カーカスコードの引き抜け防止効果を高めることのできる空気入りタイヤを提供する。
【解決手段】ビードコア１３の各コア部１３ａ，１３ｂをタイヤ幅方向に配列された複数の環状部材１３ｃによって形成するとともに、各環状部材１３ｃのタイヤ幅方向両面に互いにタイヤ径方向への移動が規制されるように係合可能な複数の屈曲部１３ｄを設け、各コア部１３ａ，１３ｂの屈曲部１３ｄによってカーカスコード１１ａの端部を挟持するようにしたので、カーカスコード１１ａの挟持部分を屈曲部１３ｄの凹凸に応じて屈曲させることができ、カーカスコード１１ａをビードコア１３に確実に係止することができる。この場合、屈曲部１３ｄの係合により各環状部材１３ｃ同士のタイヤ径方向への移動を規制することができる。
【選択図】図２There is provided a pneumatic tire capable of enhancing an effect of preventing a carcass cord from being pulled out even in a structure in which an end portion of a carcass cord is sandwiched between a pair of core portions.
SOLUTION: Each core portion 13a, 13b of a bead core 13 is formed by a plurality of annular members 13c arranged in the tire width direction, and the movement of each annular member 13c in both the tire width direction is mutually restricted in the tire radial direction. Since the plurality of bendable portions 13d that can be engaged are provided and the end portions of the carcass cord 11a are sandwiched by the bend portions 13d of the core portions 13a and 13b, the sandwiched portion of the carcass cord 11a is bent. The carcass cord 11a can be reliably locked to the bead core 13 by bending according to the unevenness of 13d. In this case, the movement of the annular members 13c in the tire radial direction can be restricted by the engagement of the bent portions 13d.
[Selection] Figure 2

Description

本考案は、例えば乗用車、トラック、バス等に用いられる空気入りタイヤに関するものである。   The present invention relates to a pneumatic tire used in, for example, passenger cars, trucks, buses and the like.

従来、この種の空気入りタイヤとしては、複数本のカーカスコードがゴムで被覆されたシート状のカーカス部材を左右一対のビード部間に亘って配置し、カーカスプライの端部をビードコアの周りからタイヤ幅方向外側に巻き上げてビード部に係止するようにしたものが一般的である。このような構造では、サイドウォール部においてカーカスコードの巻き上げ部分の有無によりタイヤ径方向の剛性差を生ずるため、この巻き上げ端部に応力が集中することにより、セパレーション故障が発生し易いという問題がある。   Conventionally, as this type of pneumatic tire, a sheet-like carcass member in which a plurality of carcass cords are covered with rubber is arranged between a pair of left and right bead portions, and an end portion of the carcass ply is arranged around the bead core. What is rolled up on the outer side in the tire width direction and locked to the bead portion is generally used. In such a structure, there is a difference in rigidity in the tire radial direction depending on the presence or absence of the carcass cord winding portion in the sidewall portion, and there is a problem that a separation failure is likely to occur due to stress concentration at the winding end portion. .

そこで、このような問題を解消するものとして、ビードコアを左右一対のコア部によって形成し、カーカス部材を巻き上げずにその端部を一対のコア部間に挟み込むことにより、カーカスコードをビードコアに係止するようにしたものが知られている（例えば、特許文献１参照。）。
特開２００５−３２９９１４号公報 Therefore, to solve such problems, the bead core is formed by a pair of left and right core portions, and the carcass cord is locked to the bead core by sandwiching the end portion between the pair of core portions without winding up the carcass member. What was made to do is known (for example, refer patent document 1).
JP 2005-329914 A

しかしながら、前記ビードコアはビードワイヤを周方向に複数巻回してなるため、前述のようにカーカスコードを一対のコア部で挟持した場合、カーカスコードの張力によりビードワイヤの配列が乱れてコア部の型崩れを生じ易く、カーカスコードの係止効果が不十分であった。このため、タイヤの加硫成形時の張力や走行中の繰り返し歪みによりビードコアからのカーカスコードの引き抜けが生じ、ビード部の耐久性を低下させるという問題点があった。   However, since the bead core is formed by winding a plurality of bead wires in the circumferential direction, when the carcass cord is sandwiched between the pair of core portions as described above, the arrangement of the bead wires is disturbed by the tension of the carcass cord and the core portion is deformed. The carcass cord locking effect was insufficient. For this reason, there is a problem that the carcass cord is pulled out from the bead core due to the tension at the time of vulcanization molding of the tire and the repeated strain during running, and the durability of the bead portion is lowered.

本考案は前記問題点に鑑みてなされたものであり、その目的とするところは、一対のコア部によってカーカスコードの端部を挟持する構造においても、カーカスコードの引き抜け防止効果を高めることのできる空気入りタイヤを提供することにある。   The present invention has been made in view of the above problems, and the object of the present invention is to enhance the carcass cord pull-out preventing effect even in a structure in which the end portion of the carcass cord is sandwiched between a pair of core portions. It is to provide a pneumatic tire that can be used.

本考案は前記目的を達成するために、左右のビードコアに亘って延びるカーカスコードを有するとともに、ビードコアをタイヤ幅方向に対向する一対のコア部によって形成し、各コア部の対向面間にカーカスコードの端部を挟持するようにした空気入りタイヤにおいて、前記各ビードコアのコア部をタイヤ幅方向に配列された複数の環状部材によって形成するとともに、各環状部材のタイヤ幅方向両面に互いにタイヤ径方向への移動が規制されるように係合可能な複数の屈曲部を設け、各コア部の屈曲部によってカーカスコードの端部を挟持している。   In order to achieve the above object, the present invention has a carcass cord extending across the left and right bead cores, and the bead core is formed by a pair of core portions facing each other in the tire width direction, and the carcass cords are formed between the facing surfaces of the respective core portions. In the pneumatic tire that sandwiches the end portion of the tire, the core portion of each bead core is formed by a plurality of annular members arranged in the tire width direction, and the tire radial direction is mutually opposite on both sides of the tire width direction of each annular member. A plurality of bendable portions that can be engaged so as to be restricted from moving to each other are provided, and the end portions of the carcass cord are sandwiched between the bend portions of the core portions.

これにより、各コア部の屈曲部によってカーカスコードの端部を挟持する際、カーカスコードの挟持部分が屈曲部の凹凸に応じて屈曲することから、カーカスコードをビードコアに確実に係止することができる。また、屈曲部の係合により各環状部材同士のタイヤ径方向への移動が規制されることから、カーカスコードの張力が加わっても各環状部材が互いに位置ずれを生ずることがない。更に、ビードコアが複数の環状部材によって形成されていることから、ビードワイヤで形成した場合のようにワイヤ端部のスプライス部を生ずることがない。   Thereby, when the end portion of the carcass cord is clamped by the bent portion of each core portion, the holding portion of the carcass cord is bent according to the unevenness of the bent portion, so that the carcass cord can be reliably locked to the bead core. it can. Further, since the movement of the annular members in the tire radial direction is restricted by the engagement of the bent portions, the annular members are not displaced from each other even when the tension of the carcass cord is applied. Further, since the bead core is formed by a plurality of annular members, the splice portion of the wire end portion is not generated unlike the case where the bead core is formed.

本考案によれば、カーカスコードをビードコアに確実に係止することができるので、カーカスコードの引き抜け防止効果を高めることができ、ビード部の耐久性の低下を確実に防止することができる。この場合、カーカスコードの張力が加わってもビードコアの各環状部材が互いに位置ずれを生ずることがないので、ビードコアの型崩れを確実に防止することができる。更に、ビードワイヤで形成した場合のようにワイヤ端部のスプライス部を生ずることがないので、ユニフォミティの向上を図ることができる。   According to the present invention, since the carcass cord can be reliably locked to the bead core, the effect of preventing the carcass cord from being pulled out can be enhanced, and the decrease in the durability of the bead portion can be reliably prevented. In this case, even if the tension of the carcass cord is applied, the annular members of the bead core are not displaced from each other, so that it is possible to reliably prevent the bead core from being deformed. Further, since the splice portion at the end of the wire is not generated unlike the case of forming with a bead wire, the uniformity can be improved.

図１乃至図６は本考案の一実施形態を示すもので、図１は空気入りタイヤの部分正面断面図、図２は要部拡大断面図、図３は環状部材の要部拡大断面図、図４は環状部材の製造工程を示す正面図、図５は試験結果を示す図、図６は比較例の要部拡大断面図である。   1 to 6 show an embodiment of the present invention. FIG. 1 is a partial front sectional view of a pneumatic tire, FIG. 2 is an enlarged sectional view of a main part, and FIG. 3 is an enlarged sectional view of a main part of an annular member. 4 is a front view showing the manufacturing process of the annular member, FIG. 5 is a diagram showing the test results, and FIG. 6 is an enlarged cross-sectional view of the main part of the comparative example.

この空気入りタイヤは、外周面側に形成されるトレッド部１と、幅方向両側に形成されるサイドウォール部２と、サイドウォール部２のタイヤ径方向内側に形成されるビード部３とを備えている。この空気入りタイヤは、シート状に形成されたインナーライナ１０、カーカス部材１１及びベルト１２を成形ドラム上で重ね合わせて円筒状に成形した後、カーカス部材１１が左右のビードコア１３間に跨るようにトロイダル状に成形し、その外周面にトレッド部材１４及びサイドウォール部材１５を貼付けることによって形成される。   The pneumatic tire includes a tread portion 1 formed on the outer peripheral surface side, sidewall portions 2 formed on both sides in the width direction, and bead portions 3 formed on the tire radial direction inner side of the sidewall portions 2. ing. In this pneumatic tire, an inner liner 10, a carcass member 11, and a belt 12 formed in a sheet shape are overlapped on a forming drum and formed into a cylindrical shape, and then the carcass member 11 straddles between the left and right bead cores 13. It is formed by forming a toroidal shape and attaching the tread member 14 and the side wall member 15 to the outer peripheral surface thereof.

インナーライナ１０は気密性を有するシート状のゴムからなり、カーカス部材１１の内周面側に配置される。   The inner liner 10 is made of a sheet-like rubber having airtightness, and is disposed on the inner peripheral surface side of the carcass member 11.

カーカス部材１１は、複数本の補強コード１１ａがタイヤの周方向に配列されたシート状のゴムからなり、そのタイヤ周方向一端部及び他端部をスプライスして円筒状に形成されるとともに、その幅方向端部はビードコア１３に係止している。   The carcass member 11 is made of a sheet-like rubber in which a plurality of reinforcing cords 11a are arranged in the circumferential direction of the tire, and is formed into a cylindrical shape by splicing one end and the other end in the tire circumferential direction. The end in the width direction is locked to the bead core 13.

ベルト１２はスチールコードや高強度繊維等からなる複数本の補強コード１２ａをシート状のゴム材で被覆してなり、カーカス部材１１の外周面側に配置される。   The belt 12 is formed by covering a plurality of reinforcing cords 12a made of steel cords, high-strength fibers, and the like with a sheet-like rubber material, and is disposed on the outer peripheral surface side of the carcass member 11.

ビードコア１３は、タイヤ幅方向に対向する一対のコア部１３ａ，１３ｂによって形成され、各コア部１３ａ，１３ｂの対向面間にカーカスコード１１ａの端部が挟持されるようになっている。各コア部１３ａ，１３ｂはそれぞれタイヤ幅方向に配列された複数の環状部材１３ｃによって形成され、各環状部材１３ｃのタイヤ幅方向両面にはタイヤ幅方向に凹凸をなすように屈曲する複数の屈曲部１３ｄがタイヤ径方向複数箇所に設けられている。この場合、屈曲部１３ｄはタイヤ径方向２箇所以上５箇所以下に設けられる。即ち、各コア部１３ａ，１３ｂは互いに屈曲部１３ｄ同士が係合するようにタイヤ幅方向に積層され、屈曲部１３ｄの係合によりタイヤ径方向への移動が規制されるようになっている。この場合、タイヤ幅方向内側に配置されるコア部１３ａはタイヤ幅方向外側に配置されるコア部１３ｂよりも環状部材１３ｃの数が多くなっている。また、環状部材１３ｃはプレス加工によって厚さ方向に屈曲した金属板等の板状部材からなり、図３に示すように屈曲部１３ｄを含むタイヤ幅方向の寸法Ｔ1 が板状部材の肉厚Ｔ2 の１．５倍以下になるように形成されている。この場合、図４の破線に示すように同一の板状部材１３ｅから互いに径方向サイズ（インチ）の異なる複数の環状部材１３ｃを同心円状に打ち抜き、そのうちの一つによって所望のサイズの環状部材１３ｃが形成される。   The bead core 13 is formed by a pair of core portions 13a and 13b facing in the tire width direction, and an end portion of the carcass cord 11a is sandwiched between facing surfaces of the core portions 13a and 13b. Each of the core portions 13a and 13b is formed by a plurality of annular members 13c arranged in the tire width direction, and a plurality of bent portions that bend so as to form irregularities in the tire width direction on both surfaces of the annular members 13c in the tire width direction. 13d is provided at a plurality of locations in the tire radial direction. In this case, the bent portions 13d are provided at 2 or more and 5 or less in the tire radial direction. That is, the core portions 13a and 13b are stacked in the tire width direction so that the bent portions 13d engage with each other, and movement in the tire radial direction is restricted by the engagement of the bent portions 13d. In this case, the core part 13a arrange | positioned at the tire width direction inner side has the number of the annular members 13c larger than the core part 13b arrange | positioned at the tire width direction outer side. The annular member 13c is made of a plate-like member such as a metal plate bent in the thickness direction by pressing, and the dimension T1 in the tire width direction including the bent portion 13d is the thickness T2 of the plate-like member as shown in FIG. It is formed to be 1.5 times or less. In this case, as shown by the broken line in FIG. 4, a plurality of annular members 13c having different radial sizes (inches) are concentrically punched out from the same plate-like member 13e, and one of the annular members 13c has a desired size. Is formed.

トレッド部材１４は押出成形によって形成されるゴムからなり、カーカス部材１１の幅方向中央側及びベルト１２の外周面側に覆うように配置され、その外周面にはトレッドパターンの溝１４ａが加硫成型時に形成される。   The tread member 14 is made of rubber formed by extrusion molding, and is disposed so as to cover the center side in the width direction of the carcass member 11 and the outer peripheral surface side of the belt 12, and a tread pattern groove 14 a is vulcanized on the outer peripheral surface. Sometimes formed.

サイドウォール部材１５は押出成形によって形成されるゴムからなり、カーカス部材１１の幅方向両端側を覆うように配置される。   The sidewall member 15 is made of rubber formed by extrusion molding, and is disposed so as to cover both ends of the carcass member 11 in the width direction.

以上の構成においては、カーカス部材１１をビードコア１３で巻き上げずに、その端部をビードコア１３の各コア部１３ａ，１３ｂ間に挟み込むことにより、カーカスコード１１ａがビードコア１３に係止する。その際、カーカスコード１１ａの端部が各コア部１３ａ，１３ｂの屈曲部１３ｄによって挟持されるとともに、図２に示すようにカーカスコード１１ａの挟持部分が屈曲部１３ｄの凹凸に応じて屈曲することから、カーカスコード１１ａがビードコア１３に確実に係止する。この場合、屈曲部１３ｄの数がタイヤ径方向２箇所よりも少ないと十分な係止効果が得られず、屈曲部１３ｄの数が５箇所よりも多いと屈曲部１３ｄの成形や加工が困難となるため、屈曲部１３ｄはタイヤ径方向２箇所以上５箇所以下に設けることが好ましい。また、屈曲部１３ｄを含むタイヤ幅方向の寸法Ｔ1 が板状部材の肉厚Ｔ2 の１．５倍よりも大きくなると、屈曲部１３ｄの角部に他の環状部材１３ｃとの接触による応力が集中して破壊を生ずるおそれがあるため、屈曲部１３ｄを含むタイヤ幅方向の寸法Ｔ1 は板状部材の肉厚Ｔ2 の１．５倍以下であることが好ましい。   In the above configuration, the carcass cord 11 a is locked to the bead core 13 by sandwiching the end portion between the core portions 13 a and 13 b of the bead core 13 without winding up the carcass member 11 with the bead core 13. At that time, the end portion of the carcass cord 11a is sandwiched between the bent portions 13d of the core portions 13a and 13b, and the sandwiched portion of the carcass cord 11a is bent according to the unevenness of the bent portion 13d as shown in FIG. Therefore, the carcass cord 11a is securely locked to the bead core 13. In this case, if the number of the bent portions 13d is smaller than two in the tire radial direction, a sufficient locking effect cannot be obtained, and if the number of the bent portions 13d is larger than five, it is difficult to form and process the bent portion 13d. Therefore, it is preferable to provide the bent portions 13d at 2 to 5 locations in the tire radial direction. When the dimension T1 in the tire width direction including the bent portion 13d is larger than 1.5 times the thickness T2 of the plate-like member, stress due to contact with the other annular member 13c is concentrated on the corner portion of the bent portion 13d. Therefore, it is preferable that the dimension T1 in the tire width direction including the bent portion 13d is 1.5 times or less the thickness T2 of the plate member.

ここで、図５に示すように、本発明の実施例について、ＲＦＶ、カーカスコードの抜け強度、ビード型崩れの評価試験を行ったところ、以下の結果が得られた。この試験では、タイヤサイズが１８５／５５Ｒ１５のものを用いて行った。比較例１は、図６(a) に示すようにカーカスコード２０をビードワイヤ２１からなるビードコア２２の周りで巻き上げたものである。比較例２は、図６(b) に示すようにビードワイヤ２１からなる一対のコア部２３間にカーカスコード２４を挟み込み、ビードワイヤ２１を上下方向及び左右方向に整列するように配置したものである。比較例３は、図６(c) に示すようにビードワイヤ２１からなる一対のコア部２３間にカーカスコード２４を挟み込み、ビードワイヤ２１を千鳥状に配置したものである。ＲＦＶの試験では、ＪＩＳ−Ｄ４２３３に基づくユニフォミティ試験によりＲＦＶの測定を行い、比較例１の測定結果の逆数を１００とした場合の指数により評価した。抜け強度の試験では、カーカスコードをビードコアに挟み込んで引張試験を行い、カーカスコードの破断または抜けが生ずるまでの引張力を測定し、比較例１の測定結果の逆数を１００とした場合の指数により評価した。ビード型崩れの試験では、タイヤ加硫後にビード部１０箇所を切断し、ビードコアの断面形状を観測することにより型崩れの有無を判定した。   Here, as shown in FIG. 5, evaluation examples of RFV, carcass cord pull-out strength, and bead-type collapse were performed on the examples of the present invention, and the following results were obtained. In this test, tires having a tire size of 185 / 55R15 were used. In Comparative Example 1, a carcass cord 20 is wound around a bead core 22 composed of a bead wire 21 as shown in FIG. In Comparative Example 2, as shown in FIG. 6 (b), a carcass cord 24 is sandwiched between a pair of core portions 23 made of a bead wire 21, and the bead wires 21 are arranged so as to be aligned in the vertical and horizontal directions. In Comparative Example 3, as shown in FIG. 6C, a carcass cord 24 is sandwiched between a pair of core portions 23 made of bead wires 21, and the bead wires 21 are arranged in a staggered manner. In the RFV test, the RFV was measured by a uniformity test based on JIS-D4233, and the evaluation was performed using an index when the reciprocal of the measurement result of Comparative Example 1 was set to 100. In the pull-out strength test, the carcass cord is sandwiched between bead cores, a tensile test is performed, the tensile force until the carcass cord breaks or comes off is measured, and the index when the reciprocal of the measurement result of Comparative Example 1 is 100 is used. evaluated. In the bead deformation test, ten bead portions were cut after vulcanizing the tire, and the presence or absence of deformation was determined by observing the cross-sectional shape of the bead core.

前記試験の結果、ＲＦＶ及び抜け強度の試験において、本考案の実施例では、何れも比較例１、２及び３よりも良好な結果が得られた。尚、比較例１については構造上、抜け強度の試験を行っていない。また、ビード型崩れの試験において、比較例１、２及び３では何れもビードコアの型崩れを生じたが、本考案の実施例では型崩れを生じなかった。   As a result of the test, in the examples of the RFV and the pull-out strength, the results of the examples of the present invention were better than those of Comparative Examples 1, 2, and 3. In addition, the comparative example 1 is not structurally tested for pull-out strength. Further, in the bead mold collapse test, all of Comparative Examples 1, 2, and 3 caused the bead core to be deformed, but the embodiment of the present invention did not cause the mold collapse.

このように、本実施形態によれば、ビードコア１３の各コア部１３ａ，１３ｂをタイヤ幅方向に配列された複数の環状部材１３ｃによって形成するとともに、各環状部材１３ｃのタイヤ幅方向両面に互いにタイヤ径方向への移動が規制されるように係合可能な複数の屈曲部１３ｄを設け、各コア部１３ａ，１３ｂの屈曲部１３ｄによってカーカスコード１１ａの端部を挟持するようにしたので、カーカスコード１１ａの挟持部分を屈曲部１３ｄの凹凸に応じて屈曲させることができ、カーカスコード１１ａをビードコア１３に確実に係止することができる。これにより、カーカスコード１１ａの引き抜け防止効果を高めることができ、ビード部３の耐久性の低下を確実に防止することができる。この場合、屈曲部１３ｄの係合により各環状部材１３ｃ同士のタイヤ径方向への移動を規制することができるので、カーカスコード１１ａの張力が加わっても各環状部材１３ｃが互いに位置ずれを生ずることがなく、ビードコア１３の型崩れを確実に防止することができる。更に、ビードコア１３を複数の環状部材１３ｃによって形成するようにしたので、ビードワイヤで形成した場合のようにワイヤ端部のスプライス部を生ずることがなく、ユニフォミティの向上を図ることができる。   Thus, according to this embodiment, the core portions 13a and 13b of the bead core 13 are formed by the plurality of annular members 13c arranged in the tire width direction, and the tires are mutually attached to both surfaces of the annular members 13c in the tire width direction. Since a plurality of bendable portions 13d that can be engaged so as to be restricted from moving in the radial direction are provided, and the end portions of the carcass cord 11a are sandwiched between the bend portions 13d of the core portions 13a and 13b, the carcass cord The pinched portion of 11a can be bent according to the unevenness of the bent portion 13d, and the carcass cord 11a can be reliably locked to the bead core 13. As a result, the effect of preventing the carcass cord 11a from being pulled out can be enhanced, and a decrease in the durability of the bead portion 3 can be reliably prevented. In this case, since the movement of the annular members 13c in the tire radial direction can be restricted by the engagement of the bent portions 13d, the annular members 13c are displaced from each other even if the tension of the carcass cord 11a is applied. Therefore, it is possible to reliably prevent the bead core 13 from being deformed. Further, since the bead core 13 is formed by the plurality of annular members 13c, the spliced portion of the wire end portion is not generated unlike the case where the bead wire 13 is formed, and the uniformity can be improved.

また、環状部材１３ｃの屈曲部１３ｄをタイヤ径方向２箇所以上５箇所以下に設けたので、屈曲部１３ｄの成形や加工を容易に行うことができるとともに、十分な係止効果を得ることができ、実用化に際して極めて有利である。   In addition, since the bent portion 13d of the annular member 13c is provided at 2 to 5 locations in the tire radial direction, the bent portion 13d can be easily formed and processed, and a sufficient locking effect can be obtained. This is extremely advantageous for practical use.

更に、環状部材１３ｃをタイヤ幅方向に凹凸をなすように屈曲する板状部材によって形成するとともに、屈曲部１３ｄを含むタイヤ幅方向の寸法Ｔ1 が板状部材の肉厚Ｔ2 の１．５倍よりも大きくなるように形成したので、屈曲部１３ｄの角部に他の環状部材１３ｃとの接触による応力が集中することがなく、環状部材１３ｃの破壊を効果的に防止することができる。   Further, the annular member 13c is formed of a plate-like member that is bent so as to be uneven in the tire width direction, and the dimension T1 in the tire width direction including the bent portion 13d is 1.5 times the wall thickness T2 of the plate-like member. Therefore, stress due to contact with the other annular member 13c does not concentrate at the corner of the bent portion 13d, and the destruction of the annular member 13c can be effectively prevented.

また、環状部材１３ｃを、同一の板状部材１３ｅから同心円状に打ち抜かれた互いに径方向サイズの異なる複数の環状部材１３ｃのうちの一つによって形成するようにしたので、径方向サイズの異なる複数の種類のタイヤを製造する場合、各サイズに対応する環状部材１３ｃを効率よく製造することができる。   Further, since the annular member 13c is formed by one of a plurality of annular members 13c having different radial sizes punched concentrically from the same plate-like member 13e, a plurality of different radial sizes are provided. When manufacturing this kind of tire, the annular member 13c corresponding to each size can be manufactured efficiently.

本考案の一実施形態を示す空気入りタイヤの部分正面断面図Partial front sectional view of a pneumatic tire showing an embodiment of the present invention 空気入りタイヤの要部拡大断面図Principal enlarged sectional view of pneumatic tire 環状部材の要部拡大断面図An enlarged sectional view of the main part of the annular member 環状部材の製造工程を示す正面図Front view showing manufacturing process of annular member 試験結果を示す図Diagram showing test results 比較例の要部拡大断面図Main part enlarged sectional view of a comparative example

符号の説明Explanation of symbols

３…ビード部、１１ａ…カーカスコード、１３…ビードコア、１３ａ，１３ｂ…コア部、１３ｃ…環状部材、１３ｄ…屈曲部、１３ｅ…板状部材。   DESCRIPTION OF SYMBOLS 3 ... Bead part, 11a ... Carcass cord, 13 ... Bead core, 13a, 13b ... Core part, 13c ... Ring member, 13d ... Bending part, 13e ... Plate-shaped member.

Claims (4)

左右のビードコアに亘って延びるカーカスコードを有するとともに、ビードコアをタイヤ幅方向に対向する一対のコア部によって形成し、各コア部の対向面間にカーカスコードの端部を挟持するようにした空気入りタイヤにおいて、
前記各ビードコアのコア部をタイヤ幅方向に配列された複数の環状部材によって形成するとともに、
各環状部材のタイヤ幅方向両面に互いにタイヤ径方向への移動が規制されるように係合可能な複数の屈曲部を設け、
各コア部の屈曲部によってカーカスコードの端部を挟持した
ことを特徴とする空気入りタイヤ。 Pneumatic that has a carcass cord that extends across the left and right bead cores, and that is formed by a pair of core portions facing each other in the tire width direction, and sandwiching the end portions of the carcass cords between the opposing surfaces of each core portion In the tire,
While forming the core portion of each bead core by a plurality of annular members arranged in the tire width direction,
Provided with a plurality of bendable portions that can be engaged with each other so that movement in the tire radial direction is regulated on both sides in the tire width direction of each annular member;
A pneumatic tire characterized in that an end portion of a carcass cord is sandwiched by a bent portion of each core portion. 前記環状部材の屈曲部をタイヤ径方向２箇所以上５箇所以下に設けた
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 bent portion of the annular member is provided at 2 or more and 5 or less in the tire radial direction. 前記環状部材をタイヤ幅方向に凹凸をなすように屈曲する板状部材によって形成するとともに、屈曲部を含むタイヤ幅方向の寸法が板状部材の肉厚の１．５倍以下になるように形成した
ことを特徴とする請求項１または２記載の空気入りタイヤ。 The annular member is formed by a plate-like member that is bent so as to be uneven in the tire width direction, and is formed so that the dimension in the tire width direction including the bent portion is 1.5 times or less the thickness of the plate-like member. The pneumatic tire according to claim 1 or 2, characterized in that: 前記環状部材を、同一の板状部材から同心円状に打ち抜かれた互いに径方向サイズの異なる複数の環状部材のうちの一つによって形成した
ことを特徴とする請求項１、２または３記載の空気入りタイヤ。 4. The air according to claim 1, wherein the annular member is formed by one of a plurality of annular members that are concentrically punched from the same plate-like member and have different radial sizes. Tires.
JP2006005484U 2006-07-07 2006-07-07 Pneumatic tire Expired - Fee Related JP3125454U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014234074A (en) * 2013-06-03 2014-12-15 住友ゴム工業株式会社 Pneumatic tire
CN105437876A (en) * 2014-09-23 2016-03-30 韩国轮胎株式会社 Pneumatic tire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014234074A (en) * 2013-06-03 2014-12-15 住友ゴム工業株式会社 Pneumatic tire
CN105437876A (en) * 2014-09-23 2016-03-30 韩国轮胎株式会社 Pneumatic tire
JP2016068930A (en) * 2014-09-23 2016-05-09 ハンコック タイヤ カンパニー リミテッド Pneumatic tire

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