JP2008036860A - Method of manufacturing pneumatic tire - Google Patents

Method of manufacturing pneumatic tire Download PDF

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JP2008036860A
JP2008036860A JP2006210723A JP2006210723A JP2008036860A JP 2008036860 A JP2008036860 A JP 2008036860A JP 2006210723 A JP2006210723 A JP 2006210723A JP 2006210723 A JP2006210723 A JP 2006210723A JP 2008036860 A JP2008036860 A JP 2008036860A
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bead core
carcass ply
tire
pneumatic tire
width direction
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JP5183895B2 (en
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Akira Masuya
亮 桝屋
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Bridgestone Corp
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Bridgestone Corp
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  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a pneumatic tire capable of dispensing with independent forming processing with respect to a carcass ply to sufficiently prevent an increase in the number of work processes and tire cost and capable of effectively removing the unexpected breaking tear of a ply cord. <P>SOLUTION: In manufacturing the pneumatic tire constituted so that the respective side parts of the carcass ply 4a, which extends up to respective bead parts 2 from a tread part in a toroidal form through both sidewall parts 1, are held between the inside half part 3a positioned inside a tire width direction and outside half part 3b positioned outside the tire width direction of a bead core 3, a folded deformation part having a form becoming a protruded part toward an inside half part is formed to the side parts of the carcass ply 4a extending to the gap between the inside and outside half parts 3a and 3b of the bead core 3 in the vulcanization molding of a green tire. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、空気入りタイヤの製造方法に関するものであり、とくには、カーカスプライの耐引き抜け性を高めるための、それの、ビードコアに対する折り曲げ固定を、特別の作業工程を必要とすることなく、簡単かつ容易に行い得る技術を提案するものである。   The present invention relates to a method for manufacturing a pneumatic tire, and in particular, for the purpose of enhancing the pull-out resistance of a carcass ply, its bending and fixing to a bead core without requiring a special work process, We propose a technique that can be easily and easily performed.

カーカスプライの耐引き抜け性を高めるために、特許文献１には、スチールコードからなるカーカスプライの側部部分に、塑性変形させた少なくとも一箇所の屈曲部を予め設け、そして、カーカスプライの側部部分を、その屈曲部をビードコアの隅部に対応させてビードコアの周りに巻き付ける技術が開示されている。
特開２０００−３０１９１５号公報 In order to improve the pull-out resistance of the carcass ply, Patent Document 1 provides in advance at least one bent portion plastically deformed in the side portion of the carcass ply made of a steel cord, and the carcass ply side A technique is disclosed in which a portion is wound around a bead core with a bent portion corresponding to a corner of the bead core.
JP 2000-301915 A

しかるに、上記従来技術にあっては、生タイヤの成型工程および生タイヤに対する加硫工程とは別個独立の作業工程で、カーカスプライの一箇所以上に塑性域の癖付け加工を施すことが必要になるため、作業工数の増加、ひいては、タイヤコストの増加が否めない問題があった他、癖付け加工の程度によっては、カーカスプライ、直接的にはプライコードそれ自体の強度が低下しすぎて、タイヤの負荷転動中に、そのプライコードに不測の破断が生じることがある、という問題もあった。   However, in the above prior art, it is necessary to perform a brazing process in a plastic region at one or more locations in the carcass ply in an operation process that is independent of the green tire molding process and the raw tire vulcanization process. Therefore, there was a problem that the work man-hours and thus the tire cost could not be increased, and depending on the degree of brazing, the strength of the carcass ply, directly the ply cord itself was too low, There has also been a problem that the ply cord may break unexpectedly during the rolling of the tire.

この発明は、従来技術が抱えるこのような問題を解決することを課題としてなされたものであり、それの目的とするところは、カーカスプライに対する独立した癖付け加工を不要とすることで、作業工数およびタイヤコストの増加を十分に防止することができ、また、プライコードの不測の破断のおそれを有効に取り除くことができる空気入りタイヤの製造方法を提供するにある。   The present invention has been made to solve such problems of the prior art, and the object of the present invention is to eliminate the need for independent brazing on the carcass ply, thereby reducing the number of work steps. An object of the present invention is to provide a method of manufacturing a pneumatic tire that can sufficiently prevent an increase in tire cost and can effectively eliminate the possibility of unexpected breakage of a ply cord.

この発明に係る空気入りタイヤの製造方法は、トレッド部から、両サイドウォール部を経てそれぞれのビード部までトロイダルに延びるカーカスプライの各側部部分を、ビードコアの、タイヤ幅方向の内側に位置する、たとえば、ビードワイヤの、タイヤ半径方向への渦巻き状巻回構造になる内側半部と、タイヤ幅方向の外側に位置する、これもたとえば、同様の渦巻状巻回構造になる外側半部との間に挟持してなる空気入りタイヤを製造するにあたって、生タイヤの加硫成形に際し、ビードコアの内側半部と外側半部との間に延在する、スチールコード、有機繊維コード等からなるカーカスプライの側部部分に、いずれか一方の半部側へ、塑性域もしくは弾性域の折れ曲がり変形部を、好ましく全周にわたって形成するにある。   In the method for manufacturing a pneumatic tire according to the present invention, each side portion of the carcass ply that extends in a toroidal manner from the tread portion to the respective bead portions via both sidewall portions is located inside the bead core in the tire width direction. For example, the inner half of the bead wire that forms a spiral winding structure in the tire radial direction and the outer half that is located outside the tire width direction, which also forms a similar spiral winding structure, for example. Carcass plies made of steel cords, organic fiber cords, etc. that extend between the inner half and the outer half of the bead core during the vulcanization of raw tires when manufacturing pneumatic tires sandwiched between them The bent portion of the plastic region or the elastic region is preferably formed over the entire circumference on either side of the side portion.

ここでの折れ曲がり変形部の折曲がり形態としては、Ｌ字状その他の適宜の形態を選択することができるが、好ましくは、ビードコアのいずれか一方の半部側へ凸となる形態の折れ曲がり変形部を形成する。   As the bending form of the bending deformation part here, an L-shaped or other appropriate form can be selected, but preferably the bending deformation part in a form that protrudes toward one half of the bead core. Form.

そしてこの場合の、折れ曲がり変形部の形成は、ビードコアのいずれか一方の半部に設けた、タイヤは幅方向の窪み部内へ、ビードコアの他方の半部によってカーカスプライを押し込むことによって行うことが好ましい。
ところで、カーカスプライのこのような押し込みは、ビードコアの内側半部に設けた窪み部に対し、ビードコアの外側半部によって行うことが好ましい。 In this case, the bent deformation part is preferably formed by pushing the carcass ply into the hollow part of the bead core by pushing the carcass ply into the hollow part in the width direction with the other half part of the bead core. .
By the way, such pushing of the carcass ply is preferably performed by the outer half of the bead core with respect to the recess provided in the inner half of the bead core.

ここにおいてより好適には、加硫成形前の生タイヤにおいて、ビードコアの内側半部を覆う内側未加硫ゴムの体積を、加硫モールドの成形表面に対して、いいかえれば、製品タイヤでの所要のゴム体積に対して不足ぎみとする一方、ビードコアの外側半部を覆う外側未加硫ゴムの体積を、加硫モールドの成形表面に対して余剰ぎみとして、加硫モールド内での生タイヤの加硫成形に際し、その外側未加硫ゴムを加硫モールドによって押圧し、この押圧力により、ビードコアの外側半部をタイヤ幅方向の内側へ変位させて、カーカスプライを、ビードコアの内側半部に設けた窪み部内へ押し込む。   More preferably, in the raw tire before vulcanization molding, the volume of the inner unvulcanized rubber covering the inner half of the bead core is compared with the molding surface of the vulcanization mold. On the other hand, the volume of the outer unvulcanized rubber covering the outer half of the bead core is used as a surplus with respect to the molding surface of the vulcanization mold. During vulcanization molding, the outer unvulcanized rubber is pressed by a vulcanization mold, and by this pressing force, the outer half of the bead core is displaced inward in the tire width direction, and the carcass ply is placed on the inner half of the bead core. Push into the provided recess.

この発明に係る製造方法では、生タイヤの加硫成形に際して、カーカスプライの各側部部分に、ビードコアの内側半部側もしくは外側半部側への、塑性域、弾性域等の折れ曲がり変形部を形成し、この折れ曲がり変形部によってカーカスプライをビードコアに掛合させてカーカスプライを抜け止めすることにより、カーカスプライに予め癖付け加工を施すことなしに、それの耐引き抜け性を十分に高めることができる。
従ってここでは、カーカスプライに癖付け加工を施すことに起因して発生する作業工数および、コストの増加を十分に回避することができる。 In the production method according to the present invention, when the raw tire is vulcanized, each side portion of the carcass ply is provided with a bent deformation portion such as a plastic region or an elastic region on the inner half side or outer half side of the bead core. By forming and folding the carcass ply to the bead core by this bent deformation part to prevent the carcass ply from coming off, the carcass ply can be sufficiently pulled out without being subjected to brazing in advance. it can.
Therefore, here, it is possible to sufficiently avoid an increase in work man-hours and costs caused by applying the brazing process to the carcass ply.

しかも、この製造方法によれば、カーカスプライを挟み込む、ビードコアの、内側半部と外側半部の形態を予め選択して、カーカスプライのパスラインをコントロールすることにより、カーカスプライの折れ曲がり変形度合いが大きくなりすぎることに起因する、カーカスプライ、ひいてはプライコードの意図しない破断を有効に防止することができる。   Moreover, according to this manufacturing method, the degree of bending deformation of the carcass ply is controlled by pre-selecting the shape of the inner half and the outer half of the bead core sandwiching the carcass ply and controlling the pass line of the carcass ply. It is possible to effectively prevent unintended breakage of the carcass ply and thus the ply cord due to being too large.

ところで、ここにおける折れ曲がり変形部の折れ曲がり形態は、所要に応じて適宜に選択可能であるが、その折れ曲がり形態を、ビードコアのいずれか一方の半部側へ凸となる形態としたときは、その迂曲形態の故に、小さな凸部の形成をもって、カーカスプライの耐引き抜け性を十分に高めることができ、これがため、カーカスプライを、意図しない破断が生じるほどの大きな折れ曲がり変形から有効に保護することができる。   By the way, the bending form of the bending deformation part here can be appropriately selected as required, but when the bending form is a form projecting toward one half of the bead core, the bending form thereof Because of the form, the formation of small convex portions can sufficiently enhance the pull-out resistance of the carcass ply, and therefore, the carcass ply can be effectively protected from bending deformation that causes unintended breakage. it can.

かかる方法において、ビードコアのいずれか一方の半部に設けた窪み部内へ、ビードコアの他の半部によってカーカスプライを押し込んで、カーカスプライに折れ曲がり変形部を形成する場合には、その窪み部の、たとえば生タイヤの幅方向断面図での深さ、その他の寸法を選択することで、製品タイヤでの、カーカスプライの折れ曲がり変形度合い所要に応じてコントロールすることができるので、このことによってもまた、その折り曲げ変形度合が大きくなりすぎることに起因するカーカスプライの不測の破断のおそれを、簡易に取り除くことができる。   In such a method, when the carcass ply is pushed into the hollow portion provided in one half of the bead core by the other half of the bead core to form a bent deformed portion in the carcass ply, of the hollow portion, For example, by selecting the depth in the width direction cross-sectional view of the raw tire and other dimensions, the car tire ply can be controlled according to the degree of bending deformation of the product tire. The risk of unexpected breakage of the carcass ply due to the excessive bending deformation can be easily removed.

ここにおいて、ビードコアの内側半部に設けた窪み部内へ、ビードコアの外側半部によってカーカスプライを押し込む場合は、たとえば、加硫モールドの型締め力を利用して、ビードコアの外側半部に十分大きな押し込み外力を付与することができるので、カーカスプライに所期した通りの折れ曲がり変形部を確実に形成することができる。   Here, when the carcass ply is pushed into the recess provided in the inner half of the bead core by the outer half of the bead core, for example, using the clamping force of the vulcanization mold, the outer half of the bead core is sufficiently large. Since the pushing external force can be applied, the bent deformation part as expected for the carcass ply can be formed reliably.

またここで、ビードコアの内側半部を覆う内側未加硫ゴムの体積を不足ぎみとする一方で、外側半部を覆う外側未加硫ゴムの体積を余剰ぎみとして、生タイヤの加硫成形に際し、外側未加硫ゴムを加硫モールドによって押圧し、この押圧力に基いてカーカスプライをビードコアの内側半部に設けた窪み部内へ押し込む場合には、生タイヤの、加硫モールド内での加硫成形のための、その加硫モールドの型締め操作を行うだけで、その型締めに伴う必然的帰結としてカーカスプライに所期した通りの折れ曲がり変形部を、極めて簡易に形成することができる。   In addition, here, the volume of the inner unvulcanized rubber covering the inner half of the bead core is deficient, while the volume of the outer unvulcanized rubber covering the outer half is used as a surplus, and the raw tire is vulcanized. When the outer unvulcanized rubber is pressed by a vulcanization mold and the carcass ply is pushed into the recess provided in the inner half of the bead core based on the pressing force, the raw tire is vulcanized in the vulcanization mold. By simply performing the mold clamping operation of the vulcanization mold for the vulcanization molding, it is possible to form the bent deformation portion as expected in the carcass ply as an inevitable consequence of the mold clamping.

図１は、この発明の実施の形態を一方のビード部について示す図であり、図１（ａ）は、成型を終えた生タイヤのビード部をそして図1（ｂ）は、加硫成形を終了した製品タイヤのビード部をそれぞれ示す。
なお、製品タイヤは、通常の空気入りタイヤと同様に、図示しないトレッド部、このトレッド部の両側部に連続する一対のサイドウォール部１および、各サイドウォール部１の内周側に連続するビード部２を具えるとともに、それぞれのビード部２のビードコア３間にトロイダルに延在してこれらの各部を補強する、ラジアル構造もしくはバイアス構造のカーカス4を具える。 FIG. 1 is a view showing an embodiment of the present invention with respect to one bead portion. FIG. 1 (a) shows a bead portion of a green tire after molding, and FIG. 1 (b) shows a vulcanization molding. The bead part of the finished product tire is shown respectively.
The product tire includes a tread portion (not shown), a pair of side wall portions 1 continuous on both sides of the tread portion, and a bead continuous on the inner peripheral side of each side wall portion 1 in the same manner as a normal pneumatic tire. In addition to the parts 2, a carcass 4 having a radial structure or a bias structure is provided which extends toroidally between the bead cores 3 of the respective bead parts 2 and reinforces these parts.

ここで、カーカス４は、有機繊維コード、スチールコード等からなるカーカスプライ４ａの一枚以上、図では一枚にて形成してなり、このカーカスプライ４ａの各側部部分は、ビードコア３の、タイヤ幅方向の内側に位置する内側半部３ａと、タイヤ幅方向の外側に位置する外側半部３ｂとの間に挟持してなる。   Here, the carcass 4 is formed of one or more carcass plies 4a made of organic fiber cords, steel cords, etc., one piece in the figure, and each side portion of the carcass ply 4a is formed of the bead core 3. It is sandwiched between an inner half 3a located on the inner side in the tire width direction and an outer half 3b located on the outer side in the tire width direction.

このような製品タイヤを製造するに当り、図１（ａ）に示す生タイヤの未加硫ビード部１１では、たとえば、ワイヤを渦巻状に巻回して構成してなるビードコア３の内側半部３ａに、タイヤ幅方向の窪み部１２、図では、タイヤ幅方向内側に向く成分と、タイヤ半径方向の外方に向く成分とのそれぞれを有する窪み部を設ける一方、その内側半部3ａと、カーカスプライ4ａの側部部分を介して対抗する外側半部3ｂに、窪み部１２を埋め込むに足る余剰巻回部分１３を設ける。   In manufacturing such a product tire, in the unvulcanized bead portion 11 of the green tire shown in FIG. 1A, for example, an inner half portion 3a of a bead core 3 formed by winding a wire in a spiral shape. In addition, a recess 12 having a tire width direction recess 12 in the figure, and a recess portion having a component facing inward in the tire width direction and a component facing outward in the tire radial direction, is provided, while the inner half 3a, carcass An excess winding portion 13 that is sufficient to embed the recess 12 is provided in the outer half 3b that opposes the side portion of the ply 4a.

なお、生タイヤの成型に際しては、この図に示すところとは反対に、外側半部３ｂに窪み部を、一方、内側半部３ａに余剰巻回部分をそれぞれ設けることも可能である。   When molding the raw tire, it is possible to provide a recess in the outer half 3b and an excess winding portion in the inner half 3a, contrary to the case shown in FIG.

ビードコア３をこのように構成し、カーカスプライ４ａの側部部分を、そこへの何の癖付け加工もなしに、内外側のそれぞれの半部３ａ，3ｂ間に延在させたところにおいて、この発明では、生タイヤの、加硫モールド内での加硫成形に際し、その加硫モールドで、ビードコア３の外側半部3ｂ、とくにはそれの余剰巻回部分１３の形成箇所に、図に矢印Ａで示すように、内側半部3ａの窪み部側に向く方向の押圧力を作用させて、その外側半部3ｂを、カーカスプライ４ａとともに、窪み部１２を埋め込む向きに、図では水平方向に変位させ、この結果として、加硫成形後の製品タイヤに、カーカスプライ4ａが、図1（ｂ）に示すように、内側半部3ａ側に凸となる形態に、塑性域、弾性域等で折れ曲がる、カーカスプライ4ａの所要量の折れ曲がり変形部１４を、好ましくはビード部２の全周にわたって形成する。   The bead core 3 is configured in this manner, and the side portion of the carcass ply 4a is extended between the inner and outer halves 3a and 3b without any brazing process. In the invention, when the raw tire is vulcanized in the vulcanization mold, the outer half 3b of the bead core 3, particularly the portion where the excessively wound portion 13 is formed, is indicated by the arrow A in the figure. As shown in FIG. 2, the outer half 3b is displaced in the horizontal direction in the figure so as to embed the depression 12 together with the carcass ply 4a by applying a pressing force in the direction toward the depression of the inner half 3a. As a result, the carcass ply 4a is bent in a plastic region, an elastic region, or the like into a form in which the carcass ply 4a protrudes toward the inner half 3a as shown in FIG. , The required amount of carcass ply 4a is bent The deformation portion 14, preferably formed over the entire circumference of the bead portion 2.

これによれば、有機繊維コード、スチールコード等からなるカーカスプライ4ａは、加硫成形によって事後的に形成されたその折れ曲がり変形部14で、ビードコア３に強固に掛合することになって、十分大きな耐引き抜け性を発揮することができ、また、窪み部１２の形状、寸法等の選択の下でカーカスプライ４ａに破断が生じるほどの、そこへの大きな折れ曲がり変形の発生を有効に防止することができる。   According to this, the carcass ply 4a made of an organic fiber cord, a steel cord or the like is sufficiently large because it is firmly engaged with the bead core 3 at its bent deformation portion 14 formed afterwards by vulcanization molding. Pull-out resistance can be demonstrated, and it is possible to effectively prevent the occurrence of a large bending deformation to the carcass ply 4a so that the carcass ply 4a breaks under the selection of the shape, size, etc. of the recess 12 Can do.

なおここで、ビードコア３、直接的にはそれの内外側の各半部3ａ，3ｂを、ワイヤを渦巻状に巻き回して構成して場合にあっては、そのワイヤを半径方向に変位させることは、ほとんど不可能であるも、そのワイヤは、タイヤ幅方向には比較的円滑に変位できるので、上述したような、外側半部3ｂの、内側半部３ａの窪み部12側への変位は、十分容易に行わせることができる。   Here, if the bead core 3, or directly the inner and outer halves 3a, 3b, is formed by winding a wire in a spiral shape, the wire is displaced in the radial direction. However, since the wire can be displaced relatively smoothly in the tire width direction, the displacement of the outer half 3b toward the recess 12 of the inner half 3a as described above is not possible. Can be done easily enough.

そしてこの場合において、ビードコア３の外側半部3ｂの、窪み部１２側への変位を、加硫モールドの作動に基づいて必然的に発生させるためには、加硫成形前の生タイヤの図１（ａ）に示すビード部１１において、ビードコア３の内側半部3ａを覆う内側未加硫ゴム１５の体積を、図に仮想線で示す製品タイヤの所要のゴム体積に対して不足気味とする一方で、ビードコア３の外側半部3ｂを覆う外側未加硫ゴム16の体積を、仮想線で示す製品タイヤの所要のゴム体積に対して余剰ぎみとする。   In this case, in order to inevitably generate the displacement of the outer half 3b of the bead core 3 toward the recess 12 based on the operation of the vulcanization mold, the raw tire before vulcanization molding is shown in FIG. In the bead portion 11 shown in (a), the volume of the inner unvulcanized rubber 15 covering the inner half 3a of the bead core 3 is considered to be insufficient with respect to the required rubber volume of the product tire indicated by the phantom line in the figure. Thus, the volume of the outer unvulcanized rubber 16 covering the outer half 3b of the bead core 3 is set as a surplus with respect to the required rubber volume of the product tire indicated by the phantom line.

このことによれば、加硫モールドによる生タイヤの加硫成形に際するそれの型締めにより、外側未加硫ゴム１６が加硫モールドの成形表面によって押し退け変形させることになり、このときの、矢印Ａで示す方向の押圧力の水平分力に基いて、外側半部3ｂ、とくには、それの余剰巻回部分13の形状箇所が、タイヤ幅方向内側へ自動的に水平変位されることになるので、その外側半部3ｂは、カーカスプライ4ａを、内側半部3ａの窪み部12内へ常に確実に、かつ十分に押込み変形されることができる。   According to this, the outer unvulcanized rubber 16 is pushed and deformed by the molding surface of the vulcanization mold by clamping the raw tire during vulcanization molding of the vulcanization mold, On the basis of the horizontal component force of the pressing force in the direction indicated by the arrow A, the outer half 3b, in particular, the shape portion of the excess winding portion 13 thereof is automatically horizontally displaced inward in the tire width direction. As a result, the outer half 3b can always be surely and sufficiently deformed by pushing the carcass ply 4a into the recess 12 of the inner half 3a.

なおここで、ビードコア３の外側半部3ｂに窪み部を設けた場合には、カーカスプライ4ａに、その外側半部3ｂ側に凸となる折れ曲がり変形部が形成されることになる。
そして、これらのいずれの場合においても、ビードコアのいずれかの半部に複数の窪み部を設けた場合には、カーカスプライに、窪み部の数に応じた折れ曲がり凸変形部を形成できることはもちろんである。 Here, when a hollow portion is provided in the outer half 3b of the bead core 3, a bent deformed portion that protrudes toward the outer half 3b is formed in the carcass ply 4a.
And in any of these cases, when a plurality of dents are provided in any half of the bead core, the carcass ply can be bent and deformed according to the number of dents. is there.

以上カーカスプライ4ａに、ビードコア３のいずれか一方の半部側へ凸となる形態の折れ曲がり変形部１４を形成する場合について説明したが、たとえば、ビードコア３の外側半部3ｂを、図2に例示するように変位させる場合には、カーカスプライ4ａの側部部分に鉤状の折れ曲がり変形部を形成することもできる。   The case where the bent deformed portion 14 is formed on the carcass ply 4a so as to protrude toward one half of the bead core 3 has been described. For example, the outer half 3b of the bead core 3 is illustrated in FIG. In the case of displacement as described above, a hook-shaped bent deformation portion can be formed on the side portion of the carcass ply 4a.

この発明の実施の形態をビード部について示すタイヤ幅方向の断面図である。It is sectional drawing of the tire width direction which shows embodiment of this invention about a bead part. 図１の変形例をビードコアについて示す断面図である。It is sectional drawing which shows the modification of FIG. 1 about a bead core.

符号の説明Explanation of symbols

1 サイドウォール部
2 ビード部
3 ビードコア
3a 内側半部
3b 外側半部
4 カーカス
4a カーカスプライ
11 未加硫ビード部
12 窪み部
13 余剰巻回部分
14 折れ曲がり変形部
15 内側未加硫ゴム
16 外側未加硫ゴム 1 Side wall
2 Bead section
3 Bead core
3a Inner half
3b outer half
4 Carcass
4a carcass ply
11 Unvulcanized bead
12 depression
13 Extra winding part
14 Bending deformation
15 Inner unvulcanized rubber
16 Outside unvulcanized rubber

Claims (5)

トレッド部から、両サイドウォール部を経てそれぞれのビード部までトロイダルに延びるカーカスプライの各側部部分を、ビードコアの、タイヤ幅方向の内側に位置する内側半部と、タイヤ幅方向の外側に位置する外側半部との間に挟持してなる空気入りタイヤを製造するに当り、
生タイヤの加硫成形に際して、ビードコアの内側半部と外側半部との間に延在するカーカスプライの側部部分に、いずれか一方の半部側への折れ曲がり変形部を形成する空気入りタイヤの製造方法。 Each side part of the carcass ply that extends toroidally from the tread part through both sidewall parts to the respective bead part is located on the inner half part of the bead core located inside the tire width direction and on the outer side of the tire width direction. In manufacturing a pneumatic tire sandwiched between the outer half and the
A pneumatic tire that forms a bent deformation portion to one of the half portions on the side portion of the carcass ply extending between the inner half portion and the outer half portion of the bead core during vulcanization molding of the raw tire. Manufacturing method. ビードコアのいずれかの一方の半部側へ凸となる形態の折れ曲がり変形部を形成する請求項1に記載の空気入りタイヤの製造方法。   2. The method for producing a pneumatic tire according to claim 1, wherein the bent deformed portion is formed so as to be convex toward one half of the bead core. ビードコアのいずれか一方の半部に設けた、タイヤ幅方向の窪み部内へ、ビードコアの他方の半部によってカーカスプライを押し込んで、カーカスプライの側部部分に折れ曲がり変形部を形成する請求項1もしくは２に記載の空気入りタイヤの製造方法。   The carcass ply is pushed by the other half of the bead core into a hollow portion in the tire width direction provided in one half of the bead core, and a bent deformation portion is formed in a side portion of the carcass ply. 2. A method for producing a pneumatic tire according to 2. ビードコアの内側半部に設けた窪み部内へ、ビードコアの外側半部によってカーカスプライを押し込む請求項３に記載の空気入りタイヤの製造方法。   The method for manufacturing a pneumatic tire according to claim 3, wherein the carcass ply is pushed into the hollow portion provided in the inner half of the bead core by the outer half of the bead core. 加硫成形前の生タイヤにおいて、ビードコアの内側半部を覆う内側未加硫ゴムの体積を、加硫モールドの成形表面に対して不足ぎみとする一方、ビードコアの外側半部を覆う外側未加硫ゴムの体積を、加硫モールドの成形表面に対して余剰ぎみとして、加硫モールド内での生タイヤの加硫成形に際し、前記外側未加硫ゴムを加硫モールドによって押圧し、この押圧力により、ビードコアの外側半部をタイヤ幅方向の内側へ変位させて、カーカスプライを、ビードコアの内側半部に設けた窪み部内へ押し込む請求項４に記載の空気入りタイヤの製造方法。   In the raw tire before vulcanization molding, the volume of the inner unvulcanized rubber that covers the inner half of the bead core is insufficient with respect to the molding surface of the vulcanization mold, while the outer unvulcanized rubber that covers the outer half of the bead core. When the volume of the vulcanized rubber is a surplus with respect to the molding surface of the vulcanization mold, the outer unvulcanized rubber is pressed by the vulcanization mold during the vulcanization molding of the raw tire in the vulcanization mold, and this pressing force 5. The method for manufacturing a pneumatic tire according to claim 4, wherein the outer half of the bead core is displaced inward in the tire width direction and the carcass ply is pushed into a recess provided in the inner half of the bead core.
JP2006210723A 2006-08-02 2006-08-02 Pneumatic tire manufacturing method Expired - Fee Related JP5183895B2 (en)

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CN105437876A (en) * 2014-09-23 2016-03-30 韩国轮胎株式会社 Pneumatic tire

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JP2003252013A (en) * 2002-03-04 2003-09-09 Bridgestone Corp Pneumatic tire
JP2004098826A (en) * 2002-09-09 2004-04-02 Bridgestone Corp Pneumatic radial tire and its manufacturing method
JP2005329914A (en) * 2004-05-21 2005-12-02 Toyo Tire & Rubber Co Ltd Pneumatic radial tire

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JPH10338003A (en) * 1997-06-09 1998-12-22 Yokohama Rubber Co Ltd:The Pneumatic tire
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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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