JPH0651368B2 - Method and apparatus for forming belt / tread assembly for radial tire - Google Patents
Method and apparatus for forming belt / tread assembly for radial tireInfo
- Publication number
- JPH0651368B2 JPH0651368B2 JP62244775A JP24477587A JPH0651368B2 JP H0651368 B2 JPH0651368 B2 JP H0651368B2 JP 62244775 A JP62244775 A JP 62244775A JP 24477587 A JP24477587 A JP 24477587A JP H0651368 B2 JPH0651368 B2 JP H0651368B2
- Authority
- JP
- Japan
- Prior art keywords
- belt
- layer
- auxiliary layer
- drum
- annular body
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 28
- 238000004804 winding Methods 0.000 claims description 27
- 229920001971 elastomer Polymers 0.000 claims description 26
- 230000002093 peripheral effect Effects 0.000 claims description 23
- 238000000465 moulding Methods 0.000 claims description 21
- 239000000835 fiber Substances 0.000 claims description 13
- 230000001131 transforming effect Effects 0.000 claims description 2
- 239000002759 woven fabric Substances 0.000 claims description 2
- 230000000712 assembly Effects 0.000 claims 2
- 238000000429 assembly Methods 0.000 claims 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 239000013536 elastomeric material Substances 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000007796 conventional method Methods 0.000 description 6
- 239000004677 Nylon Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920001778 nylon Polymers 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 239000012784 inorganic fiber Substances 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229920001875 Ebonite Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Landscapes
- Tyre Moulding (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は拡縮径可能なベルトドラムを用いてラジアルタ
イヤ用ベルト・トレッド組立体を成形する新規な方法と
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method and apparatus for forming a belt / tread assembly for a radial tire using a belt drum capable of expanding and contracting.
（従来技術） 従来、ラジアルタイヤにはその高速耐久性能を向上させ
る目的で、トレッドゴム層とラジアル方向配列のコード
層からなるタイヤカーカスとの間にベルト層及びベルト
補助層（例えばいわゆるナイロンバンド）が配置され、
成形工程においては、ベルトドラム上でこれらベルト
層，ベルト補助層およびトレッドゴム層を順次に巻き重
ねて一体化しベルト・トレッド組立体を予め形成するこ
とが一般に行われている。即ち、従来のベルト・トレッ
ド組立体の成形方法によれば、第１２図と第１３図に示
すように軸１０１により回転可能に片持ち支持され両端
部が一対の環状スプリング１０２に係止された幅約４０
mmのスラット１０３を複数個放射状に全周に配置して周
方向形状が環状でかつ軸方向断面形状が直線状であるベ
ルト成形面Ｓ１を形成している。スラット１０３の半径
方向内側に環状エヤバッグ１０４を支持ベース１０５に
固定し、エヤパイプ１０６を設けるとともに、スラット
１０３の両側に突設したフレーム１０７にドラム外径規
制リング１０８を着脱可能に取付けた構成であり、エヤ
パイプ１０６を通じてエヤーを供給して環状エヤーバッ
グ１０４をインフレートしてドラム外径を拡張すると、
ドラム外径は外径規制リング１０８により所定のベルト
貼付径に規制されるようになっている。軸方向断面形状
が直線状である上記ベルトドラム１００の外周面Ｓ
１に、円周方向に対して１０゜〜４０゜の低角度のゴム
被覆されたスダレ織りのスチール等の無機繊維コード又
は芳香族ポリアミド等の有機繊維コードからなるプライ
を複数枚各プライのコードが互いに交差する向きに巻き
重ねてベルト層Ｂを形成（第１３図）し、次いでこのベ
ルト層Ｂの外周面に周方向に対してほぼ０゜の角度のゴ
ム被覆されたスダレ織の熱収縮の良好なナイロンコード
等の有機繊維コードからなるプライを１層ないし２層巻
き重ねてベルト補助層ＢＲ（いわゆるナイロンバンド）
を形成し、更にこのベルト補助層ＢＲの半径方向外側に
トレッドゴム層Ｔを巻き重ねて一体化しベルト・トレッ
ド組立体１０９を成形する。こうして得たベルト・トレ
ッド組立体１０９を環状の拡縮径可能な把持手段を用い
てベルトドラムから取り外し、タイヤ成形ドラム上のタ
イヤカーカスの中心位置に移動させ、次いで、タイヤカ
ーカスをエア圧によりトロイダル状に膨満させてその外
周面をベルト・トレッド組立体のベルト層の内周面に圧
接し、更にトレッド圧着ローラーによりベルト層は全幅
に亘ってタイヤカーカスに圧着され、ベルト・トレッド
組立体はタイヤカーカスに一体化され生タイヤの成形が
完了するのである。(Prior Art) Conventionally, in order to improve the high-speed durability performance of a radial tire, a belt layer and a belt auxiliary layer (for example, a so-called nylon band) are provided between a tread rubber layer and a tire carcass including a cord layer arranged in a radial direction. Is placed
In the molding step, it is common practice to sequentially form the belt layer, the belt auxiliary layer, and the tread rubber layer on the belt drum, and integrate them to form a belt / tread assembly in advance. That is, according to the conventional method of forming a belt / tread assembly, as shown in FIGS. 12 and 13, the shaft 101 is rotatably cantilevered and both ends thereof are locked by a pair of annular springs 102. Width about 40
A plurality of mm slats 103 are radially arranged around the entire circumference to form a belt molding surface S 1 having an annular circumferential shape and a linear axial cross-sectional shape. An annular air bag 104 is fixed to a support base 105 on the radially inner side of the slat 103, an air pipe 106 is provided, and a drum outer diameter regulating ring 108 is detachably attached to a frame 107 protruding on both sides of the slat 103. , When air is supplied through the air pipe 106 to inflate the annular air bag 104 to expand the outer diameter of the drum,
The outer diameter of the drum is regulated to a predetermined belt attachment diameter by the outer diameter regulation ring 108. The outer peripheral surface S of the belt drum 100 having a linear axial cross-section.
1. A plurality of plies consisting of an inorganic fiber cord such as steel of woven stainless steel or an organic fiber cord such as aromatic polyamide coated with rubber at a low angle of 10 ° to 40 ° with respect to the circumferential direction. To form a belt layer B in a direction intersecting with each other (FIG. 13), and then the outer peripheral surface of the belt layer B is heat-contracted by a rubber-coated woven fabric at an angle of approximately 0 ° with respect to the circumferential direction. Belt auxiliary layer BR (so-called nylon band) by plying one or two layers of ply made of organic fiber cord such as nylon cord with excellent
Then, a belt / tread assembly 109 is formed by winding a tread rubber layer T on the outside of the belt auxiliary layer BR in the radial direction and integrating them. The belt / tread assembly 109 thus obtained is removed from the belt drum by using an annular expandable / contractible gripping means, moved to the center position of the tire carcass on the tire forming drum, and then the tire carcass is toroidally shaped by air pressure. And the outer peripheral surface of the belt / tread assembly is pressed against the inner peripheral surface of the belt layer of the belt / tread assembly, and the belt layer is pressure-bonded to the tire carcass over the entire width by the tread pressure roller. Is completed and the molding of the green tire is completed.
（従来技術の問題点） 上記従来のベルト・トレッド組立体の成形方式による場
合は、ラジアルタイヤの高速耐久性を向上させる目的で
使用したベルト補助層の熱収縮力が第９図に示すように
中央部よりも肩部において弱くなり、ベルト補強層の特
性、即ち、走行中遠心力によるベルト層のリフティング
（浮上がり現象）を抑制し、ベルトコードとゴムの剥離
損傷を防止する機能が充分に生かされないと言う問題が
ある。これは金型内仕上がりタイヤのベルト層Ｂ及びベ
ルト補助層ＢＲはその軸方向断面形状（最終仕上がり形
状）が第５図（イ）に示すように凸状に出来上がってい
るにも拘らず、ベルト・トレッド組立体成形工程におい
て、ベルト層Ｂとベルト補助層ＢＲは第５図（ハ）と第
１３図で示すように軸方向断面形状が直線状を呈する円
筒状のベルトドラム（Ｆ２又は103）上で巻き重ね形成
されることに起因している。即ち、軸方向断面形状が直
線状のベルトドラム上に巻きつけられたベルト補助層の
有機繊維コードは中央部も肩部もその周長は等しいけれ
ども、金型内仕上りタイヤでは加硫時のシエーピング工
程を経ることにより、中央部周長が肩部周長よりも長く
なっており、従ってベルト補助層の中央部は肩部よりも
大きいストレッチがかかっており、通常２％を越えるス
トレッチ差を生じている。(Problems of the prior art) In the case of the above-mentioned conventional method of forming the belt / tread assembly, the heat shrinkage force of the belt auxiliary layer used for the purpose of improving the high speed durability of the radial tire is as shown in FIG. It becomes weaker in the shoulder area than in the center area, and the characteristics of the belt reinforcing layer, that is, the function of suppressing lifting of the belt layer due to centrifugal force during running (lifting phenomenon) and preventing peeling damage of the belt cord and rubber are sufficient. There is a problem that it cannot be used. This is because the belt layer B and the belt auxiliary layer BR of the finished tire in the mold have the axial sectional shape (final finished shape) formed into a convex shape as shown in FIG. In the tread assembly forming step, the belt layer B and the belt auxiliary layer BR are cylindrical belt drums (F 2 or 103) having a linear axial sectional shape as shown in FIGS. 5 (C) and 13. ) It is due to the fact that it is formed over and over. That is, the organic fiber cords of the belt auxiliary layer wound around the belt drum whose axial sectional shape is linear have the same circumferential length in both the central portion and the shoulder portion, but in the tire finished in the mold, the shaping during vulcanization is performed. By going through the process, the central circumference is longer than the shoulder circumference, so the central part of the belt auxiliary layer is stretched more than the shoulders, which usually causes a stretch difference of more than 2%. ing.
このストレッチ差が第８〜９図に示すように残留伸度及
び熱収縮力の差となって現われるからに他ならない。
尚、前記ストレッチとは、ベルト補助層の巻き付け径に
対する仕上がり径の百分率をいう。This difference in stretch appears as the difference between the residual elongation and the heat shrinkage force as shown in FIGS.
The stretch means a percentage of the finished diameter with respect to the winding diameter of the belt auxiliary layer.
本発明は上記従来技術の問題点を解消して、ベルト補助
層の中央部ストレッチと肩部ストレッチの差を２％以内
に小さくして肩部の熱収縮力の向上、ひいてはベルト層
のリフティングを抑制する機能の向上を図り、ラジアル
タイヤの高速耐久性能の強化を実現することができるベ
ルト・トレッド組立体の成形方法と装置を提供すること
を目的とするものである。The present invention solves the above-mentioned problems of the prior art and reduces the difference between the central stretch and the shoulder stretch of the belt auxiliary layer to within 2% to improve the heat shrinkage force of the shoulder portion, and thus the lifting of the belt layer. An object of the present invention is to provide a method and an apparatus for forming a belt / tread assembly capable of improving the restraining function and enhancing the high-speed durability of a radial tire.
（問題点を解消するための手段） 上記問題点を解消するため、第１の発明（方法）の基本
的構成は、拡縮径可能なベルトドラムを用いてベルト・
トレッド組立体を成形する方法であって、非拡径状態の
前記ベルトドラムの外周面に円周方向に対して１０゜〜
４０゜の角度を有する無機又は有機繊維コードからなる
ベルトプライを複数枚巻き重ねて円筒状のベルト層を形
成する段階と、前記ベルトドラムをその軸方向断面形状
をベルト補助層の金型内最終仕上り形状と同一又はそれ
に近い形状に具体的にはベルト補助層の中央部ストレッ
チと肩部ストレッチの差が０％〜２％となる凸形状に拡
径変形させる段階と、前記形状に変形させたベルトドラ
ム上のベルト層の半径方向外側に円周方向に対して０゜
〜５゜の角度を有する有機繊維コードからなるベルト補
助層を形成する段階と、前記ベルト補助層の半径方向外
側にトレッドゴム層を巻き付けて一体化しベルト・トレ
ッド組立体を成形することを特徴とする。(Means for Solving the Problems) In order to solve the above problems, the basic configuration of the first invention (method) is to use a belt drum that can expand and contract a belt.
A method for molding a tread assembly, comprising: a method for forming a tread assembly on the outer peripheral surface of the belt drum in a non-expanded state, in the range of 10 ° to the circumferential direction.
Forming a cylindrical belt layer by laminating a plurality of belt plies made of an inorganic or organic fiber cord having an angle of 40 °, and forming the belt drum in the axial cross-sectional shape of the belt auxiliary layer in a mold final Specifically, the step of changing the shape into the same shape as the finished shape or the shape close to it, that is, the step of expanding the diameter of the belt auxiliary layer into a convex shape in which the difference between the central stretch and the shoulder stretch is 0% to 2%, and transforming into the above shape Forming a belt auxiliary layer made of an organic fiber cord having an angle of 0 ° to 5 ° with respect to the circumferential direction on the outer side of the belt layer on the belt drum, and a tread on the outer side of the belt auxiliary layer in the radial direction. It is characterized in that a rubber layer is wound and integrated to form a belt / tread assembly.
また、第２の発明（装置）の基本構成は、拡縮径可能な
ベルトドラムを用いてベルト・トレッド組立体を成形す
る装置であって、前記ベルトドラムはエラストマー材料
からなり円周方向に連続する伸縮可能な成形環状体と、
この成形環状体を拡縮径させる拡縮径手段とからなり、
非拡径状態の成形環状体の外周面はその軸方向断面形状
が直線状を呈してベルト層の巻き付け面を形成し、ま
た、拡径状態の成形環状体の外周面はその軸方向断面形
状が、ベルト補助層の金型内最終仕上り形状と同一又は
それに近い形状、具体的にはベルト補助層の中央部スト
レッチと肩部ストレッチの差が０゜〜２％になる凸形状
を呈してベルト補助層の巻き付け面を形成することを特
徴とする。The basic configuration of the second invention (apparatus) is an apparatus for forming a belt / tread assembly using a belt drum capable of expanding and contracting, the belt drum being made of an elastomer material and being continuous in the circumferential direction. A stretchable molded annular body,
Consisting of expansion and contraction diameter means for expanding and contracting this molded annular body,
The outer peripheral surface of the non-expanded molded annular body has a linear axial cross-sectional shape to form the winding surface of the belt layer, and the outer peripheral surface of the expanded annular molded body has its axial sectional shape. However, the belt has the same shape as or a shape close to the final finished shape of the belt auxiliary layer in the mold, specifically, a belt having a convex shape in which the difference between the center stretch and the shoulder stretch of the belt auxiliary layer is 0 ° to 2%. It is characterized in that the winding surface of the auxiliary layer is formed.
（作用） 本発明は、上記のとおりの構成であるので、ベルト補助
層の中央部ストレッチと肩部ストレッチの差が２％以内
となり、第８〜９図に示すように金型内仕上りタイヤの
ベルト補助層のコードの残留伸度及び熱収縮力が中央部
と肩部においてほぼ均一化されることになる。(Operation) Since the present invention is configured as described above, the difference between the central stretch and the shoulder stretch of the belt auxiliary layer is within 2%, and as shown in FIGS. The residual elongation and the heat shrinkage force of the cord of the belt auxiliary layer are substantially equalized in the central portion and the shoulder portion.
（実施例） 本発明を実施例により図面を参照しつつ以下に詳細に説
明する。(Examples) The present invention will be described in detail below with reference to the drawings by examples.
本発明はラジアルタイヤの成形工程のうち、拡縮径可能
なベルトドラムを用いてベルト層、ベルト補助層及びト
レッドゴム層の一体的な組立体を成形する工程に係り、
これ以外の工程は従来公知のラジアルタイヤの成形方式
と同じである。The present invention relates to a step of forming an integral assembly of a belt layer, a belt auxiliary layer and a tread rubber layer by using a belt drum capable of expanding and contracting diameters in a step of forming a radial tire,
The other steps are the same as those of the conventionally known molding method for radial tires.
第１の発明（方法）の基本的構成は、成形工定において
ベルト層とベルト補助層を共に円筒状に形成する従来方
式とは全く異なり、成形工程において、ベルト層は従来
通り円筒状に形成するが、ベルト補助層はその金型内最
終仕上がり形状と同一又はそれに近い形状、具体的には
ベルト補助層の中央部ストレッチと肩部ストレッチの差
が２％以内となる凸形状に形成する点が最も特徴的なポ
イントである。The basic configuration of the first invention (method) is completely different from the conventional method in which both the belt layer and the belt auxiliary layer are formed into a cylindrical shape in the molding process, and the belt layer is formed into a cylindrical shape as in the conventional method in the forming step. However, the belt auxiliary layer has a shape that is the same as or close to the final finished shape in the mold, specifically, a point that the difference between the center stretch and the shoulder stretch of the belt auxiliary layer is within 2%. Is the most characteristic point.
ベルト補助層の金型内最終仕上り形状とは、第５図
（イ）に示すようにタイヤの加硫が完了したとき金型Ｍ
内のタイヤのベルト補助層ＢＲの凸状又は の軸方向断面形状（輪郭）を意味する。又、ベルト補助
層のストレッチとは、第５図（イ）〜（ロ）に示すよう
にベルトドラムＦ１上のベルト層Ｂの半径方向外側にベ
ルト補助層ＢＲを巻きつけたときの巻きつけ径（直径）
（例えばＣＤ１）が加硫時シエーピング内圧Ｐにより金
型Ｍ内ベルト補助層ＢＲの最終仕上がり径（例えばＣＤ
０）にまで拡大された時の巻き付け径（ＣＤ１）に対す
る仕上がり径（ＣＤ０）の百分率を意味し、中央部スト
レッチとは （例えば２．５％）であり、肩部ストレッチとは （例えば１．５％）である。本発明においては第５図
（ロ）に示すようにベルトドラムＦ１上に成形されたベ
ルト・トレッド組立体のベルト補助層ＢＲの軸方向幅断
面形状は両ストレッチの差が０％〜２％の範囲に入る凸
形状に形成される。尚、両ストレッチ差が２％以内であ
る場合は、第５図（イ）（ロ）において、ベルト補助層
ＢＲの中央部の成形時と金型内仕上がり時の半径差をａ
１とし、また、肩部の成形時と金型内仕上がり時の半径
差をｂ１とした場合、ａ１＝ｂ１ 又はａ１≒ｂ１、 即ち、中央部半径差と肩部半径差が同一またはほぼ同一
となり、バンドは、ベルトの肩部においても充分な「た
が効果」を発揮する。The final finished shape of the belt auxiliary layer in the mold means the mold M when the tire is completely vulcanized as shown in FIG.
Convex shape of the belt auxiliary layer BR of the inner tire or Means the cross-sectional shape (outline) in the axial direction. Further, stretching of the belt auxiliary layer means, when the belt auxiliary layer BR is wound around the belt layer B on the belt drum F 1 in the radial direction outside, as shown in FIGS. Diameter (diameter)
(For example, CD 1 ) is the final finished diameter (for example, CD) of the belt auxiliary layer BR in the mold M due to the internal pressure P of the shaping during vulcanization.
0 ) means the percentage of the finished diameter (CD 0 ) with respect to the winding diameter (CD 1 ) when expanded to 0 ), and the central stretch is (For example, 2.5%), and what is shoulder stretch? (For example, 1.5%). In the present invention, as shown in FIG. 5 (b), the axial width cross-sectional shape of the belt auxiliary layer BR of the belt / tread assembly formed on the belt drum F 1 has a difference between both stretches of 0% to 2%. Is formed into a convex shape that falls within the range. When the difference between both stretches is within 2%, in FIG. 5 (a) and (b), the radius difference between the center part of the belt auxiliary layer BR and the finish in the mold is a.
1, and when the radius difference between the molding of the shoulder portion and the finish in the mold is b 1 , a 1 = b 1 or a 1 ≈b 1 , that is, the radius difference between the central portion and the shoulder portion is The bands are the same or almost the same, and the bands exert a sufficient "hoop effect" even on the shoulders of the belt.
また中央部ストレッチが肩部ストレッチよりも大となる
ように、ストレッチの差が２％を越える場合は、第２２
図に示すような軸方向断面形状が直線状のベルトドラム
２２を用いる従来方式によるものと同様であり、前記の
ごとくベルト肩部において、バンドの「たが効果」が充
分発揮されず、好ましくない。If the difference in stretch exceeds 2% so that the central stretch is larger than the shoulder stretch,
This is the same as in the conventional method using the belt drum 22 having a linear axial cross-sectional shape as shown in the figure, and as described above, the "raising effect" of the band is not sufficiently exerted at the belt shoulder portion, which is not preferable. .
また逆に肩部ストレッチが中央部ストレッチよりも大と
なるように、ストレッチの差が２％を越える場合は、バ
ンドコードの巻付け時において、肩部の半径が相対的に
小さくなる。従って、生タイヤが加硫金型に装着した
際、肩部の外面と金型の内面との間に間隙（浮き）が生
じやすく、その結果、加硫時に際しての内圧付加によ
り、ベルトの特に端部などが過度に伸長し、該部分の異
常変形が生じやすく、タイヤ不良が生じがちとなる。On the other hand, when the difference in stretch exceeds 2% so that the shoulder stretch becomes larger than the central stretch, the radius of the shoulder becomes relatively small when the band cord is wound. Therefore, when the green tire is mounted on the vulcanization mold, a gap (float) is likely to occur between the outer surface of the shoulder and the inner surface of the mold, and as a result, the internal pressure applied during vulcanization causes The end portion or the like is excessively elongated, and abnormal deformation of the portion is likely to occur, which tends to cause tire failure.
従って、ストレッチの差を０〜２％の範囲とする。Therefore, the difference in stretch is set in the range of 0 to 2%.
第１０図（イ）に示すように、非拡径状態で円筒状のベ
ルトドラムＦ１上に円筒状に形成されるベルト層Ｂは、
円周方向に対して１０゜〜４０゜の角度を有するスチー
ル等の無機繊維コード又は芳香族ポリアミド等の有機繊
維コードからなりゴム被覆されたスダレ織りのベルトプ
ライを各プライのコードが互いに交差する向きに複数枚
巻き重ねたものである。第１０図（ロ）に示すように、
拡径状態で外周面の軸方向断面形状がベルト補助層の金
型内最終仕上がり形状と同一又はそれに近い凸形状に変
形されたタイコ状のベルトドラムＦ１上のベルト層Ｂ
（このベルト層Ｂは勿論前記凸形状に変形されている）
の半径方向外側にその全幅をカバーするように形成され
るベルト補助層ＢＲは、ナイロン等の熱収縮の良好な有
機繊維コードからなりゴム被覆されたものであり、その
形成方法は、第１１図（イ）に示すようにゴム被覆され
た１本又は複数本（例えば２〜２０本）の有機繊維コー
ドを上記凸状に変形したベルトドラムＦ１のベルト層Ｂ
の半径方向外側にその全幅にわたって周方向に対して０
゜〜５゜の角度で円周方向に連続して螺旋状に巻きつけ
てバンド状に形成される。上記ゴム被覆された複数本の
コードは一本の連続する帯状体を呈する。尚、ベルト補
助層ＢＲのコードはゴム被覆しないものでもよい。ベル
ト補助層ＢＲは１層だけ巻き付ける場合、２層以上
巻き付ける場合、１層巻き付けた後、両肩区域のみ２
層に巻き付ける場合がある。As shown in FIG. 10 (a), the belt layer B formed in a cylindrical shape on the cylindrical belt drum F 1 in the non-expanded state is
The cords of each ply cross a rubber-coated Sudare woven belt ply made of an inorganic fiber cord such as steel or an organic fiber cord such as aromatic polyamide having an angle of 10 ° to 40 ° with respect to the circumferential direction. It is a stack of multiple sheets in the same direction. As shown in Figure 10 (b),
The belt layer B on the drum-shaped belt drum F 1 in which the axial cross-sectional shape of the outer peripheral surface in the expanded state is deformed into a convex shape that is the same as or close to the final finished shape in the mold of the belt auxiliary layer.
(Of course, the belt layer B is deformed into the convex shape)
The belt auxiliary layer BR formed so as to cover the entire width thereof in the radial direction is made of an organic fiber cord of nylon or the like having a good heat shrinkage, and is covered with rubber. As shown in (a), the belt layer B of the belt drum F 1 obtained by deforming one or more (for example, 2 to 20) organic fiber cords covered with rubber into the convex shape.
To the outside in the radial direction of 0 over the entire width in the circumferential direction
It is formed into a band by continuously spirally winding it at an angle of 5 ° to 5 °. The plurality of rubber-coated cords form one continuous strip. The cord of the belt auxiliary layer BR may not be covered with rubber. When only one belt auxiliary layer BR is wound, when two or more layers are wound, only one shoulder area is wound after one layer is wound.
May be wrapped around layers.
別の実施例では第１１図（ロ）に示すように、多数本の
有機繊維コードを引き揃えてゴム被覆されたスダレ織り
の長尺シート体をベルト全幅を覆う幅に切断し、次いで
少なくともベルト１周分プラスオーバーラップジョイン
ト幅の長さに切断し、更にこれを幅方向に３分割以上複
数分割して複数本のテープ状体とし、これをベルト全幅
にわたって周方向に対してほぼ０゜の角度で順次に巻き
つけてベルト補助層ＢＲを形成するようにしてもよい。
上記２つの実施例において巻きつけ張力は原則として一
定である。尚、ベルト補助層のコード角が５゜を越える
といわゆるタガ効果（ベルト層をタガのように全周でし
めつけてベルト層の成長即ちリフティングを抑制する効
果）が十分に発揮されない。In another embodiment, as shown in FIG. 11 (b), a long sheet body of a rubber-coated Sudare weave is prepared by aligning a large number of organic fiber cords and cut into a width that covers the entire width of the belt, and then at least the belt. Cut into one plus plus length of overlap joint, and further divide this into three or more pieces in the width direction to form a plurality of tape-like bodies, which are arranged at an angle of 0 ° in the circumferential direction over the entire width of the belt. The belt auxiliary layer BR may be formed by sequentially winding at an angle.
The winding tension is in principle constant in the two examples. If the cord angle of the belt auxiliary layer exceeds 5 °, the so-called hoop effect (the effect of tightening the belt layer around the entire circumference like a hoop to suppress the growth of the belt layer, that is, lifting) is not sufficiently exerted.
第１の発明の実施に使用する装置（第２の発明）の１実
施例を示す第１図及び第２図において、１はベルトドラ
ムであり、２はＪＩＳ−Ａ硬度が７０゜〜９８゜で均一
厚み（例えば５mm〜３０mm）のエラストマー材料（例え
ばポリウレタンまたは硬質ゴム）でなり、周方向に連続
する外周面を有する伸縮可能な成形環状体である。前記
硬度が７０゜未満のときは、拡縮径手段として後述する
セグメント方式を用いた場合に拡縮径のセグメント相互
間の隙間を覆う成形環状体部分が凹状を呈し、成形環状
体全体として好ましい真円の成形外周面が得られない。
環状体２はその両側部に大径部１３，１３を有し、この
大径部は一対のクランプリング９，１０により着脱可能
に支持され、一方のクランプリング１０は軸１４に固定
され、他方のクランプリング９はボルト１１により一方
のクランプリン１０に固定されている。In FIGS. 1 and 2 showing an embodiment of an apparatus (second invention) used for carrying out the first invention, 1 is a belt drum, and 2 is JIS-A hardness 70 ° to 98 °. Is a stretchable molded annular body made of an elastomer material (for example, polyurethane or hard rubber) having a uniform thickness (for example, 5 mm to 30 mm) and having an outer peripheral surface continuous in the circumferential direction. When the hardness is less than 70 °, when the segment method described later is used as the expanding / contracting diameter means, the molded annular body portion covering the gaps between the expanded / contracted diameter segments has a concave shape, which is a preferable perfect circle for the entire molded annular body. Cannot be obtained.
The annular body 2 has large-diameter portions 13 and 13 on both sides thereof. The large-diameter portion is detachably supported by a pair of clamp rings 9 and 10, and one clamp ring 10 is fixed to a shaft 14 and the other. The clamp ring 9 is fixed to one clamp ring 10 by a bolt 11.
この成形環状体２の成形外周面Ｓ２は、第１図に示すよ
うに非拡径時はその軸方向断面形状が直線状を呈してベ
ルト層Ｂの巻付け成形面を形成し、又、第２図に示すよ
うに拡径時はその軸方向断面形状が金型内仕上りタイヤ
のベルト補助層の軸方向断面形状と同一又はそれに近い
形状、具体的にはベルト補助層の中央部ストレッチと肩
部ストレッチの差が２％以内となる凸形状を呈して、既
に巻き付けたベルト層Ｂを同形状に変形させるとともに
ベルト補助層ＢＲの巻付け成形面を形成するのである。The molded outer peripheral surface S 2 of the shaped annular body 2, non-expanding when as shown in FIG. 1 has its axial cross section to form a winding and forming surface of the belt layer B exhibits a linear, also, As shown in FIG. 2, when the diameter is increased, the axial cross-sectional shape is the same as or close to the axial cross-sectional shape of the belt auxiliary layer of the finished tire in the mold, specifically, the central portion stretch of the belt auxiliary layer. By presenting a convex shape in which the difference in shoulder stretch is within 2%, the already wound belt layer B is deformed into the same shape, and the winding forming surface of the belt auxiliary layer BR is formed.
成形環状体２の外径を拡縮させる手段の第１実施例は本
出願人が特にセグメント方式と呼ぶやり方であり、第１
〜３図に示すように成形環状体２の半径方向内側にアル
ミニューム，鉄等の硬質材料でなり所定幅と所定長さを
有する複数個例えば８〜３２個のセグメント３を全周に
配置し、各セグメント３のドラム軸方向断面形状は金型
内仕上がりタイヤのベルト補助層ＢＲの軸方向断面形状
（最終仕上がり形状）と同一またはそれに近い形状，具
体的にはベルト補助層ＢＲの中央部ストレッチと肩部ス
トレッチの差が０％〜２％となる凸形状を有しており、
各セグメント３の長さＳＬはセグメント２の個数により
決まり、又、幅ＳＷはベルト層Ｂの幅により決まる。各
セグメント３はシリンダー４のロッドに取りつけられて
おり、各シリンダー４はベースフレーム１２に固定さ
れ、ベースフレーム１２は支柱１５に支持され、支柱１
５は台座５に立設され、台座５は軸１４に固定されその
軸方向両端は大径部クランプリング１０の下方端に当接
している。セグメント３の幅方向の両側の下面部に一対
のガイドロッド６，６が軸心Ｘに向かうように立設さ
れ、前記ベースフレーム１２に設けた孔とガイド７，７
とを摺動可能に貫通し、その先端にはストッパー１９，
１９が固定されている。ベースフレーム１２の下面（ド
ラム軸側）にガイドロッド６，６を囲むようにマグネッ
ト付ドラム外径規制部材８，８（第４図）が着脱可能に
嵌着され、第２図に示すようにシリンダー４の往動作に
より各セグメント３が放射（半径）方向に前進して成形
環状体２を拡径すると外径規制部材８，８にストッパー
１９，１９が当て止められて、拡径限が制限され所望の
拡径時ドラム外径Ｄ１を得るようになっている。各セグ
メント３が拡径したとき、成形環状体２の外周面Ｓ２の
ドラム軸方向断面形状は第２図に示すようにセグメント
３の幅方向（ドラム軸方向）の形状と相似形を呈する。
即ち成形環状体２の外周面Ｓ２の軸方向断面形状はベル
ト補助層の金型内最終仕上り形状と同一又はそれに近い
形状，具体的にはベルト補助層の中央部と肩部のストレ
ッチ差が０％〜２％になる凸形状に変形してベルト補強
層ＢＲの巻付成形面を形成するのである。また、各セグ
メント３はシリンダー４の復動作により同期的に放射方
向に後退すると成形環状体２は非拡径状態となり、その
ときの成形環状体２の外周面Ｓ２のドラム軸方向断面形
状は第１図に示すように直線状を呈してベルト層Ｂの巻
付成形面（非拡径時のドラム外径Ｄ１）を形成する。The first embodiment of the means for expanding / contracting the outer diameter of the molded annular body 2 is a method which the applicant particularly calls a segment method.
As shown in FIGS. 3 to 3, a plurality of, for example, 8 to 32 segments 3 made of a hard material such as aluminum or iron and having a predetermined width and a predetermined length are arranged on the inner circumference in the radial direction of the molded annular body 2 all around. The sectional shape in the axial direction of the drum of each segment 3 is the same as or close to the axial sectional shape (final finished shape) of the belt auxiliary layer BR of the finished tire in the mold, specifically, the central stretch of the belt auxiliary layer BR. And has a convex shape that the difference in shoulder stretch is 0% to 2%,
The length SL of each segment 3 is determined by the number of the segments 2, and the width SW is determined by the width of the belt layer B. Each segment 3 is attached to a rod of a cylinder 4, each cylinder 4 is fixed to a base frame 12, and the base frame 12 is supported by a column 15.
5 is erected on the pedestal 5, the pedestal 5 is fixed to the shaft 14, and both axial ends thereof are in contact with the lower end of the large-diameter portion clamp ring 10. A pair of guide rods 6 and 6 are erected on the lower surface portions on both sides in the width direction of the segment 3 so as to face the axis X, and the holes and guides 7 and 7 provided in the base frame 12 are provided.
And slidably penetrates through, and a stopper 19,
19 is fixed. Drum outer diameter regulating members 8 and 8 with magnets (Fig. 4) are detachably fitted to the lower surface (drum shaft side) of the base frame 12 so as to surround the guide rods 6 and 6, as shown in Fig. 2. When each segment 3 advances in the radial (radial) direction by the forward movement of the cylinder 4 and expands the diameter of the molded annular body 2, the stoppers 19 and 19 are stopped by the outer diameter restricting members 8 and 8, and the diameter expansion limit is limited. Thus, a desired drum outer diameter D 1 can be obtained when the diameter is increased. When the diameter of each segment 3 is expanded, the sectional shape of the outer peripheral surface S 2 of the molding annular body 2 in the drum axis direction is similar to the shape of the segment 3 in the width direction (drum axis direction), as shown in FIG.
That is, the axial cross-sectional shape of the outer peripheral surface S 2 of the molded annular body 2 is the same as or close to the final finished shape in the mold of the belt auxiliary layer, specifically, the difference in stretch between the central portion and the shoulder portion of the belt auxiliary layer is It is deformed into a convex shape of 0% to 2% to form the winding molding surface of the belt reinforcing layer BR. Further, when each segment 3 retreats in the radial direction synchronously with the returning movement of the cylinder 4, the molding annular body 2 is in a non-expanded state, and the outer peripheral surface S 2 of the molding annular body 2 at that time has a sectional shape in the drum axial direction. As shown in FIG. 1, the winding forming surface of the belt layer B (the drum outer diameter D 1 when the diameter is not expanded) is formed in a linear shape.
セグメント３のドラム軸方向（幅方向）形状をベルト補
助層の中央部と肩部のストレッチ差が０％〜２％となる
凸形状に設計する具体的な手法の１例をタイヤサイズＡ
でストレッチ差０％の場合について示せば次の通りであ
る。まづ、ベルト中央部の有効ストレッチ範囲１．０〜
５．０％（望ましくは２．０〜３．５％）から任意値、
例えば２．５％を選択する。次いで、第６図に示すよう
に、タイヤ構造設計断面図に記載された仕上がりタイヤ
のベルト補助層ＢＲの軸方向断面形状（最終仕上がり形
状）プロファイル（凸状実線）を基準として、その中
央部Ｃ０点及び端部Ｅ０点から軸線Ｘ方向にそれぞれ
２．５％だけ離れた点、即ち中央部ストレッチと肩部ス
トレッチの差がゼロの点（Ｅ１Ｃ１Ｅ１）を図面上で特
定し、これらの点を連結してプロファイルを得る。こ
のプロファイルはプロファイルと相似形をなしてい
る。さらに、ベルト材料厚み分を軸線Ｘ方向に移動した
点Ｅ２Ｃ２Ｅ２を連結したプロファイルが拡径状態の
成形環状体の表面の軸方向断面プロファイルである。上
記プロファイルより成形環状体２の設計厚みｄだけ軸
線Ｘ方向に平行移動して点Ｅ３Ｃ３Ｅ３を連結したプロ
ファイルを得る。An example of a specific method for designing the drum axial direction (width direction) shape of the segment 3 into a convex shape in which the stretch difference between the central portion and the shoulder portion of the belt auxiliary layer is 0% to 2% is one example of the tire size A.
The following is a description of the case where the stretch difference is 0%. First, the effective stretch range of the central part of the belt is 1.0 ~
Any value from 5.0% (desirably 2.0-3.5%),
For example, select 2.5%. Next, as shown in FIG. 6, the central portion C is based on the axial sectional shape (final finished shape) profile (convex solid line) of the belt auxiliary layer BR of the finished tire described in the tire structure design sectional view. Identifies points on the drawing that are 2.5% apart from the 0 point and end point E 0 in the axis X direction, that is, the point where the difference between the center stretch and the shoulder stretch is zero (E 1 C 1 E 1 ). Then, these points are connected to obtain a profile. This profile is similar to the profile. Furthermore, the profile in which the points E 2 C 2 E 2 obtained by moving the thickness of the belt material in the direction of the axis X are connected is the axial cross-sectional profile of the surface of the formed annular body in the expanded diameter state. From the above profile, the profile in which the points E 3 C 3 E 3 are connected is obtained by parallel translation in the axial direction X by the design thickness d of the molded annular body 2.
このプロファイルがタイヤサイズＡ，ベルト補助層中
央部ストレッチ２．５％、中央部と肩部のストレッチ差
が０％の場合の求めるセグメント３の上面軸方向断面形
状である。従って点Ｃ３が拡張時のセグメントの頂点に
当たる。This profile is the cross-sectional shape in the axial direction of the upper surface of the segment 3 to be obtained when the tire size is A, the belt auxiliary layer central portion stretch is 2.5%, and the stretch difference between the central portion and the shoulder portion is 0%. Therefore, the point C 3 corresponds to the apex of the expanded segment.
第６図（ロ）においてＣ０はベルト補助層仕上り中央位
置、Ｃ10はベルト層仕上り中央位置、Ｃ12は成形環状体
ドラムの非拡径表面中央位置、Ｃ11は巻き付けられたベ
ルト層の中央位置とし、点Ｃ11は第６図（イ）の前記プ
ロファイルの端部Ｅ１よりも幾分軸線Ｘ方向に移動し
た点に設定した点（これにより、成形終了したベルト・
トレッド組立体が非拡径状態の成形環状体ドラムから取
出し可能となる）であり、さらに材料厚み分だけ軸線Ｘ
方向に移動した点が成形環状体ドラム非拡径表面中央位
置Ｃ12となる。さらにこの点より成形環状体の厚みｄだ
け軸線Ｘ方向に移動した点Ｃ４が非拡径時のセグメント
の頂点となる。In FIG. 6B, C 0 is the center position of the belt auxiliary layer finish, C 10 is the center position of the belt layer finish, C 12 is the center position of the non-expanded surface of the molded annular drum, and C 11 is the center position of the wound belt layer. At the center position, the point C 11 is set to a point slightly moved in the direction of the axis X from the end E 1 of the profile shown in FIG. 6 (a).
The tread assembly can be taken out from the molded annular drum in the non-expanded state), and the axis line X can be increased by the material thickness.
The point moved in the direction becomes the center position C 12 of the non-expanded surface of the forming annular body drum. Further by the thickness d of the molded annular body from this point the point moves in the axial direction X C 4 is the apex of the segment at the time of non-expanding.
セグメント３の中央部の厚みｈ１及び肩部の厚みｈ２は
必要強度や他の構成部品との位置関係から任意に設計さ
れる。The thickness h 1 of the central portion and the thickness h 2 of the shoulder portion of the segment 3 are arbitrarily designed in view of the required strength and the positional relationship with other components.
成形環状体２の外径を拡縮させる手段の第２実施例は本
出願人が特に内圧方式と呼ぶやり方であって、この方式
は第７図に示すように、成形環状体２１、その両端部を
把持するクランプリング２２、全体を支える支柱２５、
回転軸と連結するベース２３、空気の給排口２４からな
り、成形環状体とクランプ部とは空気もれのない用シー
ルされている。成形環状体は内部空気圧によりインフレ
ートし成形環状体の表面は軸方向に対して凸状となる。
この凸形状は内部空気圧、成形環状体の厚みｄの配分及
び幅Ｗにより異なる。必要な凸形状はセグメントタイプ
の場合と同様な考え方で設計される。即ちタイヤ構造図
の凸形状を基に２．５％下げた点の形状を作図し、これ
によりＤ２点と形状が決まる（第７図（ハ））。この形
状となるよう成形環状体内圧０の時の外径Ｄ、厚み配分
ｄ、幅Ｗ（これは通常ベルト幅より広く決める）、内圧
Ｐ２を決める。従ってこの成形環状体は内圧Ｐ２で仕上
りタイヤのベルト補助層ＢＲの軸方向断面形状（最終仕
上がり形状）と同一又はそれに近い凸形状であるベルト
補助層ＢＲの巻付成形面を形成する。The second embodiment of the means for expanding / contracting the outer diameter of the molded annular body 2 is a method which the applicant particularly calls an internal pressure method, and this method is, as shown in FIG. 7, a molded annular body 21, both end portions thereof. Clamp ring 22 for holding the
It is composed of a base 23 connected to the rotary shaft and an air supply / discharge port 24, and the molded annular body and the clamp portion are sealed for air leakage. The molded annular body is inflated by internal air pressure so that the surface of the molded annular body is convex in the axial direction.
This convex shape depends on the internal air pressure, the distribution of the thickness d of the molded annular body, and the width W. The necessary convex shape is designed in the same way as the segment type. That is, the shape of the point lowered by 2.5% is drawn based on the convex shape of the tire structure drawing, and the shape is determined by the point D 2 (FIG. 7C). The outer diameter D, the thickness distribution d, the width W (which is generally determined to be wider than the belt width), and the internal pressure P 2 when the pressure inside the molded annular body is 0 are determined so as to obtain this shape. Therefore, this molding annular body forms the winding molding surface of the belt auxiliary layer BR which has a convex shape which is the same as or close to the axial sectional shape (final finished shape) of the belt auxiliary layer BR of the finished tire at the internal pressure P 2 .
上記セグメント方式の拡縮径手段を有する成形環状体で
なるベルトドラムの動作をベルト・トレッド組立体の成
形方法の１実施例とともに次に説明する。第１図に示す
ように、エヤシリンダー４が不動作状態にあり従って各
セグメント３とその外側を覆っている成形環状体２が非
拡径状態にあって、軸方向断面形状が直線状を呈する成
形環状体外周面Ｓ２（ドラム外径Ｄ１）の円周方向に対
して２０゜の角度を有するスチールコードからなるベル
トプライ２枚を互いに交差する方向に巻き重ねて円筒状
のベルト層Ｂを形成する。次いで、第２図に示すように
各エヤシリンダー４が往動作して、各セグメント３と成
形環状体２が放射方向に拡径し、各セグメント３のスト
ッパー１９が外径規制部材８に当て止められて成形環状
体２の外周面Ｓ２の軸方向断面形状がベルト補助層の最
終仕上り形状と同一又はそれに近い凸形状に変形し（ド
ラム外径Ｄ２）、そして当然のことにその上に巻き付け
たベルト層Ｂも同様に凸状に変形し、その変形したベル
ト層Ｂを覆うように半径方向外側に少なくとも全幅にわ
たって周方向に対してほぼ０゜の角度で、ゴム被覆した
１本のナイロンコードを円周方向に連続して螺旋状に巻
きつけ、続いてその巻きつけた上からもう一度全幅にわ
たって同じように巻きつけて２層構造のベルト補助層Ｂ
Ｒを形成する。次いで、このベルト補助層ＢＲの半径方
向外側に、定寸に切断した帯状のトレッドゴム層Ｔを巻
きつけ、続いて圧着ローラー（図示せず）によりトレッ
ドゴム層の上から押圧してベルト層Ｂ、ベルト補助層Ｂ
Ｒ及びトレッドゴム層Ｔを十分に圧着一体化してベルト
・トレッド組立体を得る。尚、タイヤ成形ドラム（図示
せず）とベルトドラム間に待機していた移送リング（図
示せず）がベルトドラム上に移動し縮径してベルト・ト
レッド組立体の外周面を把持すると、シリンダー４が復
動作して各セグメント３と成形環状体２が縮径して非拡
径状態（ドラム外径Ｄ１）に戻り、移送リングはベルト
・トレッド組立体を成形ドラム上の中心位置に移送す
る。次いで、タイヤ成形ドラム上の円筒状のタイヤカー
カスをトロイダル状に変形するとともにそのビード保持
部を軸方向内側に互いに同期移動させ、変形したタイヤ
カーカス外周面が待機しているベルト・トレッド組立体
の凸状のベルト内周面全幅に圧接される。続いて、移送
リングが拡径して待機位置へ移動すると、圧着ローラー
が動作してトレッドを押圧しタイヤカーカスとベルト・
トレッド組立体が十分に圧着一体化されて生タイヤが完
成する。The operation of the belt drum formed of the molding annular body having the segment type expanding / contracting diameter means will be described below together with one embodiment of the method for molding the belt / tread assembly. As shown in FIG. 1, the air cylinder 4 is in a non-operating state, so that each segment 3 and the molded annular body 2 covering the outside thereof are in a non-expanded state, and the axial cross-sectional shape is linear. A cylindrical belt layer B formed by winding two belt plies made of steel cords having an angle of 20 ° with respect to the circumferential direction of the outer peripheral surface S 2 (drum outer diameter D 1 ) of the molded annular body in a direction intersecting with each other. To form. Next, as shown in FIG. 2, each air cylinder 4 moves forward, each segment 3 and the molded annular body 2 radially expands, and the stopper 19 of each segment 3 abuts against the outer diameter regulating member 8. As a result, the axial cross-sectional shape of the outer peripheral surface S 2 of the molded annular body 2 is transformed into a convex shape which is the same as or close to the final finished shape of the belt auxiliary layer (drum outer diameter D 2 ), and of course, on it Similarly, the wound belt layer B is also deformed into a convex shape, and one rubber-coated nylon is formed so as to cover the deformed belt layer B radially outward at least over the entire width at an angle of approximately 0 ° with respect to the circumferential direction. A belt auxiliary layer B having a two-layer structure in which a cord is continuously wound in a circumferential direction in a spiral shape, and then the winding is wound again in the same manner over the entire width.
Form R. Next, a belt-shaped tread rubber layer T, which is cut to a certain size, is wound around the outer side of the belt auxiliary layer BR in the radial direction, and then the belt layer B is pressed by a pressure roller (not shown) from above the tread rubber layer. , Belt auxiliary layer B
The R and tread rubber layer T are sufficiently pressure-bonded and integrated to obtain a belt / tread assembly. In addition, when a transfer ring (not shown) waiting between the tire forming drum (not shown) and the belt drum moves onto the belt drum to reduce the diameter and grip the outer peripheral surface of the belt / tread assembly, 4 returns to the non-expanded state (drum outer diameter D 1 ) by reducing the diameter of each segment 3 and the molding annular body 2, and the transfer ring transfers the belt / tread assembly to the center position on the molding drum. To do. Then, the cylindrical tire carcass on the tire forming drum is deformed into a toroidal shape, and the bead holding portions thereof are axially inwardly moved in synchronization with each other, and the deformed tire carcass outer peripheral surface of the belt / tread assembly stands by. It is pressed against the entire width of the inner peripheral surface of the convex belt. Then, when the diameter of the transfer ring expands and moves to the standby position, the pressure bonding roller operates to press the tread and the tire carcass and belt.
The tread assembly is sufficiently crimped and integrated to complete a raw tire.
上記内圧方式の拡縮径手段を有する成形環状体でなるベ
ルト・ドラムの動作は次のとおりである。The operation of the belt drum formed of the molded annular body having the internal pressure type expansion / contraction diameter means is as follows.
第７図（イ）においてエアー内圧ゼロの時、成形環状体
２１は軸方向断面形状がやや凹面をなす。従って第７図
（ロ）に示すように内圧Ｐ１（０．５kg/cm2程度）で軸
方向断面形状をほぼ直線状とし、その外周面（ドラム外
径Ｄ１）に上記実施例と同様にベルト層Ｂを形成し、次
いで第７図（ハ）に示すようにエアー内圧Ｐ２（例えば
２．０kg/cm2）の充填により成形環状体２１を膨張拡径
し、その軸方向断面形状がベルト補助層ＢＲの最終仕上
り形状と同一又はそれに近い凸形状に変形する。その上
に巻き付けたベルト層Ｂもまた同様に変形し、その変形
したベルト層Ｂの半径方向外側に上記実施例と同様にし
てベルト補助層ＢＲを形成する。このベルト補助層ＢＲ
の半径方向外側にトレッドゴム層を上記実施例と同様に
して巻き付けて、ベルト・トレッド組立体を得る。In FIG. 7 (a), when the internal air pressure is zero, the molded annular body 21 has a slightly concave axial sectional shape. Therefore, as shown in FIG. 7 (b), the axial cross-sectional shape is made substantially linear at the internal pressure P 1 (about 0.5 kg / cm 2 ), and its outer peripheral surface (drum outer diameter D 1 ) is the same as in the above embodiment. The belt layer B is formed on the inner peripheral surface of the molded annular body 21, and the molded annular body 21 is expanded and expanded by filling with the internal air pressure P 2 (for example, 2.0 kg / cm 2 ) as shown in FIG. Deforms into a convex shape that is the same as or close to the final finished shape of the belt auxiliary layer BR. The belt layer B wound thereon is also similarly deformed, and the belt auxiliary layer BR is formed on the radially outer side of the deformed belt layer B in the same manner as in the above-mentioned embodiment. This belt auxiliary layer BR
A belt / tread assembly is obtained by winding a tread rubber layer on the outer side in the radial direction in the same manner as in the above embodiment.
（効果） 本発明は上述のとおり、ベルトドラムを用いてベルトト
レッド組立体を成形する際に、ベルト補助層を軸方向断
面形状においてその金型内最終仕上がり形状と同一又は
それに近い形状、具体的にはベルト補助層の中央部スト
レッチと肩部ストレッチの差が２％以内となる凸状に形
成する構成であるので、金型内仕上りタイヤのベルト補
助層のコードの残留伸度や熱収縮力が中央部と肩部にお
いてほぼ均一化されることとなり、タイヤ走行中ベルト
層の遠心力によりリフティングを抑制してラジアルタイ
ヤの高速耐久性能を向上させるのである。尚、本発明方
法によれば、円筒状のベルトドラムにベルト層を巻きつ
けた後、このベルトドラムを凸状に変形させ、その上か
らゴム被覆した１本または複数本のコードをゴム被覆し
て１本の帯状体にしたものを螺旋状に又は多数本のコー
ドでなるテープ多数本を周方向に順次に巻きつけてベル
トドラムに全幅にわたって密着させた状態にするから、
ベルト補助層の巻きつけ時に、ベルト層に異常な動きを
与えず、従ってベルト層に変形やしわ，たるみを生じさ
せる危険がなく、又、本発明方法では円筒状のベルトド
ラムにベルト層を巻きつけるから、巻きつけ時にベルト
層が蛇行したりせず、センタリング良く巻きつけること
ができ、更に又、本発明方法装置においては、ベルトド
ラムは、周方向に連続な環状体であって、従来のいわゆ
るセグメントによってドラム表面を形成するセグメント
タイプでないので、ベルト層の特にその周方向両側端部
のなめらかな貼り付けが可能となり、従来タイプにおけ
る波打ち状の貼りつけ状態とならず、ベルト肩部の剥離
損傷が防止できる。(Effects) As described above, the present invention, when molding a belt tread assembly using a belt drum, has a shape in which the belt auxiliary layer has an axial cross-sectional shape that is the same as or close to the final finished shape in the mold, specifically, Since the difference between the center stretch and the shoulder stretch of the belt auxiliary layer is 2% or less, it is formed in a convex shape, so the residual elongation and heat shrinkage force of the cord of the belt auxiliary layer of the finished tire in the mold are reduced. Is almost equalized in the central portion and the shoulder portion, and lifting is suppressed by the centrifugal force of the belt layer during tire running, and the high-speed durability performance of the radial tire is improved. According to the method of the present invention, after winding a belt layer around a cylindrical belt drum, the belt drum is deformed into a convex shape, and one or more cords covered with rubber are covered with rubber. Since it is made into one band and spirally wound, or a large number of tapes made up of a large number of cords are sequentially wound in the circumferential direction and brought into close contact with the belt drum over the entire width.
When the belt auxiliary layer is wound, the belt layer is not abnormally moved, and therefore there is no risk of causing deformation, wrinkling, or slack in the belt layer, and in the method of the present invention, the belt layer is wound around a cylindrical belt drum. Since the belt layer is wound, the belt layer does not meander during winding, and can be wound with good centering. Furthermore, in the apparatus of the present invention, the belt drum is a continuous annular body in the circumferential direction. Since it is not a segment type that forms the drum surface by so-called segments, it is possible to attach smoothly on both ends of the belt layer in the circumferential direction, so that the conventional type does not have a wavy attachment state and the belt shoulder peels off. Damage can be prevented.
第１図は本発明装置の１実施例の非拡径状態の部分断面
図、第２図は第１図装置の拡状態の部分断面図、第３図
は第１図のＹ−Ｙ線一部断面側面図、第４図はドラム外
径規制部材の斜視図、第５図（イ）は金型内仕上りタイ
ヤの部分断面図、第５図（ロ）は本発明方法により成形
されたベルト・トレッド組立体の部分断面図、第５図
（ハ）は従来方法により成形されたベルト・トレッド組
立体の部分断面図、第６図（イ）及び（ロ）は本発明装
置のセグメントの設計手法の説明図、第７図（イ）は本
発明装置の内圧方式の１実施例の非拡張径状態の部分断
面図、第７図（ロ）は本発明装置の内圧方式のベルト貼
り付け状態の部分断面図、第７図（ハ）は本発明装置の
内圧方式の拡径状態の部分断面図、第８図は実施例タイ
ヤと比較例タイヤのベルト補助層の各部のコードの残留
伸度の比較グラフ、第９図は実施例タイヤと比較例タイ
ヤのベルト補助層の各部のコードの熱収縮力の比較グラ
フ、第１０図（イ）は本発明の非拡径時のベルトドラム
にベルト層を巻きつけた状態を示す説明図、第１０図
（ロ）は本発明の拡径時のベルトドラムにベルト補助層
を巻きつけた状態を示す説明図、第１１図（イ）は本発
明のベルトドラムに一本のコードを周方向に螺旋状に連
続的に巻きつけてベルト補助層を形成する方式の説明
図、第１１図（ロ）は定寸のテープ状体多数本を順次ず
らせつつ周方向に巻き付けてベルト補助層を形成する方
式の説明図、第１２図は従来の非拡径時のベルトドラム
の部分断面図、第１３図は従来の拡径時のベルトドラム
の部分断面図である。 １……ベルトドラム、 ２……成形環状体、 ３……セグメント、 ４……シリンダー、 ８……ドラム外径規制部材、 Ｆ１……本発明のベルトドラム、 Ｂ……ベルト層、 ＢＲ……ベルト補助層、 Ｄ２……拡径時ドラム外径、 Ｄ１……非拡径時ドラム外径。FIG. 1 is a partial sectional view of an embodiment of the device of the present invention in a non-expanded state, FIG. 2 is a partial sectional view of the device of FIG. 1 in an expanded state, and FIG. 3 is a line YY of FIG. Partial sectional side view, FIG. 4 is a perspective view of a drum outer diameter regulating member, FIG. 5 (a) is a partial sectional view of a finished tire in a mold, and FIG. 5 (b) is a belt formed by the method of the present invention. -Partial cross-sectional view of the tread assembly, Fig. 5 (c) is a partial cross-sectional view of the belt-tread assembly molded by the conventional method, and Figs. 6 (a) and (b) are the design of the segment of the device of the present invention. An explanatory view of the method, FIG. 7 (a) is a partial cross-sectional view of one embodiment of the internal pressure system of the present invention device in a non-expanded diameter state, and FIG. 7 (b) is a state of the internal pressure system belt attachment of the present invention device FIG. 7 (c) is a partial cross-sectional view of the device of the present invention in the expanded state of the internal pressure system, and FIG. Comparative graph of the residual elongation of the cords of each part of the belt auxiliary layer, FIG. 9 is a graph of the heat shrinkage force of the cords of each part of the belt auxiliary layers of the example tire and the comparative example tire, and FIG. An explanatory view showing a state in which a belt layer is wound around a belt drum when the diameter is not expanded according to the present invention, and FIG. 10 (b) is an explanation showing a state where a belt auxiliary layer is wound around a belt drum when the diameter is expanded according to the present invention. FIG. 11 (a) is an explanatory view of a system for forming a belt auxiliary layer by continuously winding one cord in a spiral shape in a circumferential direction on a belt drum of the present invention, and FIG. 11 (b) is FIG. 12 is an explanatory view of a method of forming a belt auxiliary layer by sequentially winding a plurality of tape-shaped bodies of a constant size and winding them in the circumferential direction. FIG. 12 is a partial cross-sectional view of a conventional belt drum when the diameter is not expanded. FIG. 7 is a partial cross-sectional view of a conventional belt drum at the time of diameter expansion. 1 ...... belt drum, 2 ...... molded annular body 3 ...... segment, 4 ...... cylinder, 8 ...... drum outer size specification system member, F 1 ...... belt drum of the present invention, B ...... belt layer, BR ... … Belt auxiliary layer, D 2 …… Drum outer diameter when expanding, D 1 …… Drum outer diameter when not expanding.
Claims (8)
層，ベルト補助層およびトレッドゴム層からなるベルト
・トレッド組立体を成形する方法であって、非拡径状態
の前記ベルトドラムの外周面に円周方向に対して１０゜
〜４０゜の角度を有する無機又は有機繊維コードからな
るベルトプライを複数枚巻き重ねて円筒状のベルト層を
形成する段階と、前記ベルトドラムを拡径してその軸方
向断面形状をベルト補助層の金型内最終仕上がり形状と
同一又はそれに近い形状に変形させる段階と、前記形状
に変形させたベルトドラム上のベルト層の半径方向外側
に円周方向に対して０゜〜５゜の角度を有する有機繊維
コードからなるベルト補助層を形成する段階と、前記ベ
ルト補助層の半径方向外側にトレッドゴム層を巻きつけ
て一体化してベルト・トレッド組立体を得る段階とから
なることを特徴とするラジアルタイヤ用ベルト・トレッ
ド組立体の成形方法。1. A method of molding a belt-tread assembly comprising a belt layer, a belt auxiliary layer and a tread rubber layer using a belt drum capable of expanding / contracting, wherein the outer peripheral surface of the belt drum in a non-expanded state. To form a cylindrical belt layer by winding a plurality of belt plies made of inorganic or organic fiber cords having an angle of 10 ° to 40 ° with respect to the circumferential direction, and expanding the diameter of the belt drum. The step of transforming the axial cross-sectional shape into a shape that is the same as or close to the final finished shape in the mold of the belt auxiliary layer, and the radial direction outside of the belt layer on the belt drum deformed into the shape with respect to the circumferential direction. Forming a belt auxiliary layer made of an organic fiber cord having an angle of 0 ° to 5 °, and winding a tread rubber layer around the belt auxiliary layer in the radial direction to integrally form a bell. Tread assembly forming process of the belt-tread assembly for a radial tire, wherein the solid to consist of a the possible stages.
形状はベルト補助層の中央部ストレッチと肩部ストレッ
チの差が０％〜２％となる凸形状である特許請求の範囲
第１項記載のラジアルタイヤ用ベルト・トレッド組立体
の成形方法。2. The axial cross-sectional shape of the belt drum in the expanded diameter state is a convex shape in which the difference between the center stretch and the shoulder stretch of the belt auxiliary layer is 0% to 2%. A method for forming a belt / tread assembly for a radial tire as described.
繊維コードを拡径変形したベルトドラム上のベルト層の
半径方向外側に円周方向に対して０゜〜５゜の角度で連
続して螺旋状に巻きつけて形成される特許請求の範囲第
１項または第２項に記載のラジアルタイヤ用ベルト・ト
レッド組立体の成形方法。3. The belt auxiliary layer is continuous on the outer side in the radial direction of the belt layer on the belt drum obtained by expanding and deforming one or more organic fiber cords at an angle of 0 ° to 5 ° with respect to the circumferential direction. The method for forming a belt / tread assembly for a radial tire according to claim 1, wherein the belt / tread assembly is formed by spirally winding.
ドのスダレ織物にゴム被覆し長尺シート状体とし、次い
でベルト全幅を覆う幅に切断し、次いで少なくともベル
ト１周分プラスオーバーラップジョイント幅の長さに切
断し、更にこれを幅方向に複数分割して得た複数本のテ
ープ状体を拡径変形したベルトドラム上のベルト層の半
径方向外側にそれぞれドラム周方向に対して０゜〜５゜
の角度で順次に巻き付けて形成される特許請求の範囲第
１項または第２項に記載のラジアルタイヤ用ベルト・ト
レッド組立体の成形方法。4. The belt auxiliary layer is formed into a long sheet by coating a woven fabric of a large number of organic fiber cords with a rubber, and then cut to a width covering the entire width of the belt, and then at least one round of the belt plus an overlap joint. A plurality of tape-shaped bodies obtained by cutting the tape into widths and dividing the tape into a plurality of pieces in the width direction are radially expanded and deformed to the outside in the radial direction of the belt layer on the belt layer. The method for forming a belt / tread assembly for a radial tire according to claim 1 or 2, which is formed by sequentially winding at an angle of 5 ° to 5 °.
・トレッド組立体を成形する装置であって、前記ベルト
ドラムは、エラストマー材料からなり円周方向に連続す
る伸縮可能な成形環状体と、この成形環状体を拡縮径さ
せる拡縮径手段とからなり、非拡径状態の成形環状体の
外周面はその軸方向断面形状が直線状を呈してベルト層
の巻きつけ面を形成し、また、拡径状態の成形環状体の
外周面はその軸方向断面形状がベルト補助層の金型内最
終仕上り形状と同一又はそれに近い形状を呈してベルト
補助層の巻きつけ面を形成することを特徴とするラジア
ルタイヤ用トレッド・ベルト組立体の成形装置。5. A device for molding a belt / tread assembly using a belt drum capable of expanding and contracting, wherein the belt drum is made of an elastomeric material, and has a circumferentially stretchable molded annular body. This forming annular body comprises an expanding / contracting means for expanding / contracting the diameter, and the outer peripheral surface of the non-expanded forming annular body has a linear cross section in the axial direction to form a winding surface of the belt layer, and The outer peripheral surface of the molded annular body in the diameter-expanded state has a cross-sectional shape in the axial direction that is the same as or close to the final finished shape in the mold of the belt auxiliary layer and forms the winding surface of the belt auxiliary layer. Equipment for forming tread / belt assemblies for radial tires.
状はベルト補助層の中央部ストレッチと肩部ストレッチ
の差が０％〜２％となる凸形状である特許請求の範囲第
５項記載のラジアルタイヤ用ベルト・トレッド組立体の
成形装置。6. The axial cross-sectional shape of the molded annular body in the expanded diameter state is a convex shape in which the difference between the center stretch and the shoulder stretch of the belt auxiliary layer is 0% to 2%. An apparatus for forming a belt / tread assembly for a radial tire according to the item.
周に配列され、ベルト補助層の中央部ストレッチと肩部
ストレッチの差が０％〜２％となる軸方向断面凸形状を
有する多数個のセグメントと、各セグメントを同期的に
放射方向に進退させて拡縮径状態にする駆動手段とから
なる特許請求の範囲第５項又は第６項に記載のラジアル
タイヤ用ベルト・トレッド組立体の成形装置。7. The expanding / contracting diameter means is arranged along the entire circumference inside the molded annular body, and has a convex shape in the axial direction in which the difference between the center stretch and the shoulder stretch of the belt auxiliary layer is 0% to 2%. The belt / tread set for a radial tire according to claim 5 or 6, comprising a large number of segments and driving means for synchronously advancing and retreating each segment in a radial direction to bring about an expanded / contracted diameter state. Three-dimensional molding equipment.
排制御されて成形環状体を拡縮径状態にするエヤ圧であ
る特許請求の範囲第５項又は第６項に記載のラジアルタ
イヤ用ベルト・トレッド組立体の成形装置。8. The radial expansion according to claim 5 or 6, wherein the expanding / contracting diameter means is an air pressure for supplying / discharging the molded annular body to bring the molded annular body into an expanded / contracted diameter state. Equipment for forming tire belt / tread assemblies.
Priority Applications (14)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62244775A JPH0651368B2 (en) | 1987-09-29 | 1987-09-29 | Method and apparatus for forming belt / tread assembly for radial tire |
| DE3855488T DE3855488T2 (en) | 1987-06-18 | 1988-06-17 | Device for the production of a belt for radial tires |
| EP92202998A EP0524703B1 (en) | 1987-06-18 | 1988-06-17 | Apparatus for forming a band of a radial tyre |
| EP92202999A EP0524704B1 (en) | 1987-06-18 | 1988-06-17 | Pneumatic radial tyre and method for manufacturing same |
| DE3854356T DE3854356T2 (en) | 1987-06-18 | 1988-06-17 | Belted tires and manufacturing method. |
| EP92202997A EP0524702B1 (en) | 1987-06-18 | 1988-06-17 | Pneumatic radial tyre |
| US07/315,786 US5032198A (en) | 1987-06-18 | 1988-06-17 | Method for manufacturing an assembly of a belt, a band, and a tread rubber |
| EP92202996A EP0524701B1 (en) | 1987-06-18 | 1988-06-17 | Pneumatic radial tyre and method for manufacturing same |
| EP88905450A EP0319588B2 (en) | 1987-06-18 | 1988-06-17 | Pneumatic radial tire and production thereof |
| DE3855332T DE3855332T2 (en) | 1987-06-18 | 1988-06-17 | Belted tires and manufacturing method |
| DE3854357T DE3854357T2 (en) | 1987-06-18 | 1988-06-17 | Radial pneumatic tire. |
| PCT/JP1988/000609 WO1988010199A1 (en) | 1987-06-18 | 1988-06-17 | Pneumatic radial tire and production thereof |
| DE3850643T DE3850643T3 (en) | 1987-06-18 | 1988-06-17 | RADIAL TIRES AND THEIR PRODUCTION. |
| US08/827,458 US20010008158A1 (en) | 1987-06-18 | 1997-03-28 | Pneumatic radial tire and method for manufacturing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62244775A JPH0651368B2 (en) | 1987-09-29 | 1987-09-29 | Method and apparatus for forming belt / tread assembly for radial tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6487239A JPS6487239A (en) | 1989-03-31 |
| JPH0651368B2 true JPH0651368B2 (en) | 1994-07-06 |
Family
ID=17123729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62244775A Expired - Lifetime JPH0651368B2 (en) | 1987-06-18 | 1987-09-29 | Method and apparatus for forming belt / tread assembly for radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0651368B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101320722B1 (en) * | 2011-11-23 | 2013-10-21 | 금호타이어 주식회사 | Apparatus for assemblying a bead and an apex |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4118608B2 (en) * | 2002-06-11 | 2008-07-16 | 株式会社ブリヂストン | Pneumatic radial tire for aircraft and manufacturing method thereof |
| JP2007307976A (en) * | 2006-05-17 | 2007-11-29 | Bridgestone Corp | Pneumatic tire and its manufacturing method |
| JP4881122B2 (en) * | 2006-10-16 | 2012-02-22 | 住友ゴム工業株式会社 | Tire manufacturing method |
| JP2011016337A (en) * | 2009-07-10 | 2011-01-27 | Sumitomo Rubber Ind Ltd | Method for producing radial tire for heavy load |
| JP2011016338A (en) * | 2009-07-10 | 2011-01-27 | Sumitomo Rubber Ind Ltd | Method for producing radial tire for heavy load |
| JP6335048B2 (en) * | 2014-07-02 | 2018-05-30 | 住友ゴム工業株式会社 | Belt forming device |
-
1987
- 1987-09-29 JP JP62244775A patent/JPH0651368B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101320722B1 (en) * | 2011-11-23 | 2013-10-21 | 금호타이어 주식회사 | Apparatus for assemblying a bead and an apex |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6487239A (en) | 1989-03-31 |
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