JPH01306233A - Manufacture of pneumatic tire - Google Patents
Manufacture of pneumatic tireInfo
- Publication number
- JPH01306233A JPH01306233A JP63138176A JP13817688A JPH01306233A JP H01306233 A JPH01306233 A JP H01306233A JP 63138176 A JP63138176 A JP 63138176A JP 13817688 A JP13817688 A JP 13817688A JP H01306233 A JPH01306233 A JP H01306233A
- Authority
- JP
- Japan
- Prior art keywords
- bead
- assembly
- unvulcanized rubber
- wires
- unvulcanized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000011324 bead Substances 0.000 claims abstract description 123
- 239000000945 filler Substances 0.000 claims abstract description 31
- 238000000465 moulding Methods 0.000 claims abstract description 26
- 238000004804 winding Methods 0.000 claims description 4
- 238000004073 vulcanization Methods 0.000 abstract description 28
- 238000000034 method Methods 0.000 abstract description 9
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 5
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000004636 vulcanized rubber Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
- B29D2030/482—Applying fillers or apexes to bead cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野〕 本発明は、空気入りタイヤの製造方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a pneumatic tire.
［従来の技術］
従来の空気入りタイヤの製造方法は、次のとおりであっ
た。[Prior Art] A conventional method for manufacturing a pneumatic tire was as follows.
すなわち、まず未加硫ゴム組成物で被覆したワイヤを相
互に接触させがら環状に多数回巻回して、断面が多角形
のビードコアを形成する。That is, first, a bead core having a polygonal cross section is formed by winding wires coated with an unvulcanized rubber composition many times in an annular shape while contacting each other.
このビードコアの外周面に未加硫ゴム組成物からなる断
面楔形のビードフィラーを固着してビード組立体を形成
する。ビードフィラーは、１つのフィラー要素で構成さ
れることもあれば、２以上のフィラー要素で構成される
こともある。A bead filler made of an unvulcanized rubber composition and having a wedge-shaped cross section is fixed to the outer peripheral surface of this bead core to form a bead assembly. A bead filler may be composed of one filler element, or it may be composed of two or more filler elements.
次に、このビード組立体を用いて、未加硫ゴム組成物を
有する他の部品とともにグリーンタイヤを組立てる。詳
細には、円筒形の成形機上において、この成形機に貼付
けたカーカスプライの側縁をビード組立体に挿入し、更
にビード組立体のビードコアを芯にしてカーカスプライ
を外側へ折返してこれを係止する。この折返し部の外側
には、必要に応じてコード補強層を貼り重ねる。更にカ
ーカスプライの外側に、ベルト、サイドウオール、トレ
ッド等の部品を貼ってグリーンタイヤとする。This bead assembly is then used to assemble a green tire along with other parts having the unvulcanized rubber composition. Specifically, on a cylindrical molding machine, insert the side edge of the carcass ply attached to this molding machine into a bead assembly, and then fold the carcass ply outward using the bead core of the bead assembly as a core. to lock. A cord reinforcing layer is laminated on the outside of this folded portion, if necessary. Furthermore, parts such as belts, sidewalls, and treads are attached to the outside of the carcass ply to create a green tire.
最後に、このグリーンタイヤを金型に装填して加硫成形
する。Finally, this green tire is loaded into a mold and vulcanized.
従来は、以上の工程によって空気入りタイヤを製造して
いた。Conventionally, pneumatic tires have been manufactured using the above process.
［発明が解決しようとする課８］
グリーンタイヤのうち完成品タイヤのビードトウ部とビ
ードヒール部とに対応する部分は、それぞれカーカスプ
ライがビードコアに沿って前記のように折返される際の
曲げ始めと曲げ終りとにあたり、ともに丸みが付いてし
まう。−方、グリーンタイヤの加硫成形のための金型の
うちこれらトウ部及びヒール部に対応する各部分は角が
付けられている。したがって、グリーンタイヤを金型に
装填すると、グリーンタイヤと金型との間に空隙ができ
る。そして、加硫成形中にトウ部及びヒール部近傍のゴ
ムがこの空隙内に流れ込み、この空隙を埋める。[Problem 8 to be solved by the invention] The parts of the green tire that correspond to the bead toe and bead heel parts of the finished tire are the beginnings of bending when the carcass ply is folded back along the bead core as described above. At the end of the bend, both ends are rounded. - On the other hand, each part of the mold for vulcanization molding of a green tire corresponding to the toe part and the heel part is rounded. Therefore, when a green tire is loaded into a mold, a gap is created between the green tire and the mold. Then, during vulcanization molding, the rubber near the toe portion and heel portion flows into this gap and fills this gap.
一般に、加硫成形中は内圧によってカーカスプライのコ
ードに張力が作用する。また、このコードは、ポリエス
テルやナイロン等の有機繊維からなる場合には加硫成形
中に熱収縮する。Generally, during vulcanization molding, tension is applied to the cords of the carcass ply due to internal pressure. Further, when the cord is made of organic fibers such as polyester or nylon, it is heat-shrinked during vulcanization molding.
したがって、加硫初期においてゴムが熱可塑化状態にあ
るとき、カーカスプライのコードはプライ中央部に向っ
て引寄せられ、ビード組立体の上を滑るように移動する
。Therefore, when the rubber is in a thermoplastic state in the early stages of vulcanization, the cords of the carcass ply are drawn toward the center of the ply and slide over the bead assembly.
以上のゴムの流動及びコードの移動の両現象は、ビード
コアを構成するワイヤの引摺り現象を伴い、ワイヤの配
置や結束を乱したり、これを変形させたりすることがあ
る。この結果、製造が完了した空気入りタイヤの使用時
に、ビードワイヤに作用する張力が不均一になって、ビ
ードコアの強度が低下することがあった。更に、ビード
フィラーの形部れが生じることとあいまって、タイヤユ
ニフォーミティの低下を招いていた。Both of the above phenomena of rubber flow and cord movement are accompanied by a dragging phenomenon of the wires constituting the bead core, and may disturb or deform the arrangement and bundling of the wires. As a result, when the pneumatic tire that has been manufactured is used, the tension acting on the bead wires becomes uneven, which may reduce the strength of the bead core. Furthermore, this combined with the occurrence of deformation in the shape of the bead filler resulted in a decrease in tire uniformity.
さて、ビード部はタイヤの中で最も厚いため、加硫成形
中、ビードフィラー中心部の温度上昇が最も遅くなる。Since the bead portion is the thickest in the tire, the temperature rise at the center of the bead filler is the slowest during vulcanization.
ところが、従来は前記のように未加硫ビード組立体と他
の未加硫ゴム部品とからなるグリーンタイヤを一度に加
硫成形していたので、タイヤ全体の加硫成形が長時間化
していた。このことは、特にビード部が厚いトラックや
バス等の重荷重用タイヤにおいて問題となっていた。However, in the past, green tires consisting of unvulcanized bead assemblies and other unvulcanized rubber parts were vulcanized and molded at the same time as described above, so it took a long time to vulcanize the entire tire. . This has been a problem, particularly in tires for heavy loads such as trucks and buses, which have thick bead portions.
加硫成形前にも次の問題があった。すなわち、未加硫ゴ
ムは柔かいので、ビード組立体はビードフィラーが自重
で歪んだり、他の物に触れて簡単に変形したりする。ま
た、未加硫ゴムは自着性があるためにビード組立体どお
しが接着したり、異物が付着してしまったりすることも
あった。したがって、ひとつひとつのビード組立体をそ
れぞれ皿に載せて保管や運搬を行っていたのが実情であ
って、ビード組立体のこれらの性質がその取扱の機械化
や自動化を阻む要因のひとつとなっていた。There were the following problems before vulcanization molding. That is, since unvulcanized rubber is soft, the bead filler of the bead assembly is easily distorted by its own weight or easily deformed by contact with other objects. Furthermore, since unvulcanized rubber has a self-adhesive property, bead assemblies may adhere to each other or foreign matter may adhere to the rubber. Therefore, the reality is that each bead assembly is stored and transported individually on a plate, and these characteristics of bead assemblies are one of the factors that prevent mechanization and automation of their handling. .
本発明は、以上の問題を解決した空気入りタイヤの製造
方法を提供することを目的とする。An object of the present invention is to provide a method for manufacturing a pneumatic tire that solves the above problems.
前記の目的を達成するために、本発明では次の製造方法
を採用した。すなわち、まず未加硫ゴム組成物で被覆し
たワイヤを環状に巻回してなるビードコアの外周面に未
加硫ゴム組成物からなるビードフィラーを固着してビー
ド組立体を形成し、このビード組立体を予め加硫成形し
てビード成形体とした後、このビード成形体を用いて組
立てたグリーンタイヤを更に加硫成形するものである。In order to achieve the above object, the following manufacturing method was adopted in the present invention. That is, first, a bead filler made of an unvulcanized rubber composition is fixed to the outer peripheral surface of a bead core formed by winding a wire coated with an unvulcanized rubber composition in an annular shape to form a bead assembly. After vulcanization molding is performed in advance to form a bead molded body, a green tire assembled using this bead molded body is further vulcanized and molded.
［作 用］
本発明によれば、ビード組立体は、グリーンタイヤに組
立てる前に加硫成形される。この際、ビード組立体の未
加硫ゴム部分すなわちワイヤ被覆及びビードフィラーは
、加硫成形によって強度が数１０倍も大きくなり、変形
しにくくなる。また、自若性や異物付着性が消失する。[Function] According to the present invention, the bead assembly is vulcanized before being assembled into a green tire. At this time, the strength of the unvulcanized rubber portions of the bead assembly, that is, the wire coating and the bead filler, increases by several tens of times through vulcanization and becomes difficult to deform. In addition, self-juvenility and foreign matter adhesion are lost.
ビード組立体のうちタイヤのビードトウ部とビードヒー
ル部とに対応する部分に丸みが付いていても、ビード組
立体を加硫成形するための金型の内面に、これに対応す
る凹凸反転型で丸みを付けておくことができる。ビード
フィラーの部分についても同様であって、ビード組立体
を金型に装填する際にこれらの間に空隙は形成されず、
ビード組立体の加硫成形中は、前記のような従来のグリ
ーンタイヤの加硫中とは違ってゴムの流動が回避される
。Even if the parts of the bead assembly that correspond to the bead toe and bead heel of the tire are rounded, the inner surface of the mold for vulcanization molding the bead assembly is rounded with a corresponding concave-convex inverted mold. can be attached. The same applies to the bead filler portion, and no gap is formed between them when loading the bead assembly into the mold.
During the vulcanization of the bead assembly, rubber flow is avoided, unlike during the vulcanization of conventional green tires as described above.
加硫成形によって得られたビード成形体を用いてグリー
ンタイヤが組立てられ、このグリーンタイヤが加硫成形
される。A green tire is assembled using the bead molded body obtained by vulcanization molding, and this green tire is vulcanization molded.
グリーンタイヤの加硫成形の際には、従来同様のトウ部
やヒール部近傍のゴム流動やカーカスプライのコード移
動があっても、ビード成形体は強度が大きいので、ビー
ドワイヤの配置や結束が乱れに＜＜、このワイヤが変形
することもない。また、ビードフィラーは形崩れが生じ
にくい。更に、ビード組立体の加硫が完了してビード成
形体となっているから、このビード成形体を除く部分に
よってタイヤ全体の加硫成形時間が決定される。During the vulcanization molding of green tires, even if there is rubber flow near the toe and heel parts or movement of the carcass ply cord, as in the past, the bead molded body is strong, so the arrangement and bundling of the bead wires will be disrupted. <<, this wire will not be deformed. In addition, bead filler is less likely to lose its shape. Further, since the bead assembly has been completely vulcanized and has become a bead molded body, the vulcanization time of the entire tire is determined by the portion excluding the bead molded body.
［実施例］
第１図は、本発明の実施例に係る空気入りタイヤの製造
方法の工程中において、ビード組立体を金型に装填した
状態を示す部分拡大断面図である。なお、以下において
乗用車用空気入りタイヤの場合について説明するが、本
発明はトラック用やバス用等の他の用途の空気入りタイ
ヤの製造にも適用可能である。[Example] FIG. 1 is a partially enlarged sectional view showing a state in which a bead assembly is loaded into a mold during a process of a method for manufacturing a pneumatic tire according to an example of the present invention. Although the case of a pneumatic tire for a passenger car will be described below, the present invention is also applicable to the manufacture of pneumatic tires for other uses such as for trucks and buses.
符号１６は、例えば５本のワイヤ１２を互いに密着する
ように並列させ、これに未加硫ゴム組成物からなる被ｆ
ｆ１１４を施して帯状にしたリボン部材を示す。このリ
ボン部材１Ｂを例えば５回巻回して重ね、断面がほぼ矩
形の環状ビードコア１８を作成する。リボン部材１６を
使用すれば効率良くビードコア１８を作成することがで
きるが、未加硫ゴム組成物で被覆した１本のワイヤを相
互に接触させがら環状に多数回巻回して同様の形状のビ
ードコアを作成しても良い。次に、未加硫ゴム組成物か
らなるビードカバー２０でビードコア１８の内周面及び
両側面を包む。ただし、ビードカバー２０の配設は省略
しても良い。ビードコア１８の外周面には、未加硫ゴム
組成物からなり断面がほぼ楔形のビードフィラー２２が
固着される。同図に示すビードフィラー２２は、高硬度
ゴム組成物の未加硫物であっ、て断面がほぼ楔形の第１
フイラー要素２４と、未加硫中硬度ゴム組成物の第２フ
イラー要素２６とからなる。ただし、ビードフィラー２
２は、１つのフィラー要素で構成されることもあれば、
３つ以上のフィラー要素で構成されることもある。更に
、必要に応じてビードカバー２０の全面とビードフィラ
ー２２の半径方向内端域とを覆うようにコード補強層２
８を貼付ける。以上の工程によってビード組立体３０が
形成される。ビード組立体３０は、金型３２゜３４内に
装填された後、高温高圧下の加硫成形によってビード成
形体となる。Reference numeral 16 indicates that, for example, five wires 12 are arranged in parallel so as to be in close contact with each other, and a coating material made of an unvulcanized rubber composition is attached thereto.
A ribbon member formed into a band shape by applying f114 is shown. This ribbon member 1B is wound and stacked, for example, five times to create an annular bead core 18 having a substantially rectangular cross section. The bead core 18 can be efficiently created by using the ribbon member 16, but a bead core of a similar shape can be created by winding a single wire coated with an unvulcanized rubber composition in an annular shape many times while contacting each other. You may also create Next, the inner peripheral surface and both side surfaces of the bead core 18 are covered with a bead cover 20 made of an unvulcanized rubber composition. However, the provision of the bead cover 20 may be omitted. A bead filler 22 made of an unvulcanized rubber composition and having a substantially wedge-shaped cross section is fixed to the outer peripheral surface of the bead core 18 . The bead filler 22 shown in the figure is an unvulcanized product of a high hardness rubber composition, and the bead filler 22 has a substantially wedge-shaped cross section.
It consists of a filler element 24 and a second filler element 26 of an unvulcanized medium hardness rubber composition. However, bead filler 2
2 may consist of one filler element, or
It may also consist of three or more filler elements. Furthermore, if necessary, a cord reinforcing layer 2 is applied so as to cover the entire surface of the bead cover 20 and the radially inner end area of the bead filler 22.
Paste 8. The bead assembly 30 is formed by the above steps. After the bead assembly 30 is loaded into a mold 32 or 34, it is formed into a bead molded body by vulcanization molding under high temperature and high pressure.
同図に示す金型３２．３４は、上型３２と下型３４との
２つに分割されている。ただし、３つ以上に分割した金
型を使用しても良い。弾性を有するビードカバー２０と
コード補強層２８とが折曲げられているので、ビード組
立体３０の半径方向内端部の角すなわちタイヤのビード
１ヘウ部とビードヒール部とに対応する部分には丸みが
付いている。金型３２，３４の内面の対応部分には凹凸
反転型で丸みが付けられており、ビード組立体３０との
間に空隙は形成されない。金型３２，３４においてビー
ドフィラー２２が入る部分は、タイヤ完成品におけるビ
ードフィラー形状を構成するように断面がＳ字状に屈曲
している。ビードフィラー２２は、屈曲させられた上で
この部分にちょうど収められ、この部分においてもビー
ド組立体３０と金型３２．３４との間に空隙は形成され
ない。The molds 32 and 34 shown in the figure are divided into two parts, an upper mold 32 and a lower mold 34. However, a mold divided into three or more parts may be used. Since the elastic bead cover 20 and the cord reinforcing layer 28 are bent, the corners of the radially inner end of the bead assembly 30, that is, the portions corresponding to the bead 1 heel portion and bead heel portion of the tire, are rounded. is attached. Corresponding portions of the inner surfaces of the molds 32 and 34 are rounded with inverted concave and convex shapes, so that no gap is formed between them and the bead assembly 30. The portions of the molds 32 and 34 into which the bead filler 22 is inserted are bent into an S-shape in cross section so as to form the bead filler shape in the finished tire product. The bead filler 22 is bent and fits into this portion, and no gap is formed between the bead assembly 30 and the mold 32, 34 in this portion as well.
したがって、ビード組立体３０の加硫成形中に従来のよ
うなゴムの流動が生じることはなく、ワイヤ１２の配置
や結束の乱れが避けられる。ワイヤ１２が変形すること
もない。ビードフィラー２２の形崩れも生じにくい。Therefore, during the vulcanization molding of the bead assembly 30, the rubber does not flow as in the conventional case, and disturbances in the arrangement and bundling of the wires 12 can be avoided. The wire 12 will not be deformed. The bead filler 22 is also less likely to lose its shape.
ビード組立体３０の加硫成形によって、ワイヤ被覆１４
、ビードカバー２０、ビードフィラー２２及びコード補
強層２８の各未加硫ゴムが加硫ゴムに変化し、強度が数
１０倍も大きくなって変形しにくくなる。また、これら
の部分の自若性や異物付着性は消失する。The wire coating 14 is formed by vulcanization of the bead assembly 30.
, the bead cover 20, the bead filler 22, and the cord reinforcing layer 28, each unvulcanized rubber changes to vulcanized rubber, which increases the strength by several tens of times and becomes difficult to deform. Furthermore, the self-sufficiency and foreign matter adhesion properties of these parts disappear.
第２図は、以上のようにして得られたビード成形体を用
いてグリーンタイヤを組立て、このグリーンタイヤに更
に加硫成形を施して得られた空気入りタイヤの断面図で
ある。FIG. 2 is a sectional view of a pneumatic tire obtained by assembling a green tire using the bead moldings obtained as described above and further subjecting this green tire to vulcanization molding.
加硫ゴムを有するビード成形体４０は、未加硫ゴム組成
物を有する他の部品との接着を容易にするために表面処
理剤を用いて又は物理的方法で処理された後、グリーン
タイヤに組立てられる。詳細には、従来と同様の成形機
上において、カーカスプライ５２の側縁をビード成形体
４０に挿入し、更にこのビード成形体４０を芯にしてカ
ーカスプライ５２を外側へ折返してこれを係止する。The bead molded body 40 having the vulcanized rubber is treated with a surface treatment agent or by a physical method to facilitate adhesion with other parts having the unvulcanized rubber composition, and then converted into a green tire. Can be assembled. Specifically, on a molding machine similar to the conventional one, the side edges of the carcass ply 52 are inserted into the bead molded body 40, and the carcass ply 52 is then folded back to the outside using the bead molded body 40 as a core and locked. do.
更にカーカスプライ５２の外側に、ベルト５Ｇ、サイド
ウオール６０、トレッド６２等の部品を貼ってグリーン
タイヤとする。Further, parts such as a belt 5G, a sidewall 60, a tread 62, etc. are pasted on the outside of the carcass ply 52 to form a green tire.
ビード成形体４０は加硫済みであるので強度が大きく、
グリーンタイヤの加硫成形の際にビードトウ部６４やビ
ードヒール部６Ｂの近傍ゴムの流動やカーカスプライ５
２のコード移動があっても、ワイヤ１２の配置や結束が
乱れにくく、このワイヤが変形することもない。また、
ビードフィラー２２は形崩れが生じにくい。更に、ビー
ド部か厚いタイヤであっても、ビード組立体３０の加硫
が完了してビード成形体４０となっているから、このビ
ード成形体４０を除く部分によってタイヤ全体の加硫成
形時間が決定される。したがって、このグリーンタイヤ
については、短時間の加硫成形で十分である。Since the bead molded body 40 has been vulcanized, its strength is high;
During vulcanization molding of green tires, the flow of rubber near the bead toe portion 64 and bead heel portion 6B and the carcass ply 5
Even if the cord moves as shown in FIG. 2, the arrangement and binding of the wires 12 will not be easily disturbed, and the wires will not be deformed. Also,
The bead filler 22 does not easily lose its shape. Furthermore, even if the tire has a thick bead part, the bead assembly 30 has been completely vulcanized to form the bead molded body 40, so the vulcanization time for the entire tire can be reduced depending on the part other than the bead molded body 40. It is determined. Therefore, for this green tire, vulcanization molding for a short time is sufficient.
グリーンタイヤの加硫成形によって、同図に示す空気入
りタイヤ７０が完成する。The pneumatic tire 70 shown in the figure is completed by vulcanization molding of the green tire.
なお、以上に説明した本発明の実施例に係る方法と先に
説明した従来の方法とによって、それぞれ１０本の空気
入りタイヤを実際に製造し、全てのタイヤを解体してビ
ードワイヤ２０の配列状態を観察した。本実施例の場合
には全タイヤのワイヤ配置がビード成形体４０の時点と
ほとんど同じであって配列の乱れはなかったが、従来法
による１０本のタイヤのうちの２本には内側２層のワイ
ヤに乱れが生じていた。Note that 10 pneumatic tires were actually manufactured using the method according to the embodiment of the present invention described above and the conventional method described above, and all the tires were disassembled to determine the arrangement state of the bead wires 20. observed. In the case of this example, the wire arrangement of all the tires was almost the same as that of the bead molded body 40, and there was no disorder in the arrangement, but two of the ten tires made by the conventional method had two inner wires. There was a disturbance in the wires.
［発明の効果］ 以上に説明したように、本発明に係る空気入 。[Effect of the invention] As explained above, the air pump according to the present invention.
リタイヤの製造方法は、ビード組立体を予め加硫成形し
てビード成形体とした後、このビード成形体を用いて組
立てたグリーンタイヤを更に加硫成形するものであるか
ら、ビードコアを構成するワイヤの配置や結束は、ビー
ド組立体時点の状態がほぼ維持される。また、ワイヤが
変形することもなく、ビードフィラーの形崩れも生じに
くい。したがって、本発明によれば、ビードコアの強度
低下やユニフォーミティの低下が少なくなる。更に、グ
リーンタイヤの加硫成形に先だってビード組立体が予め
加硫成形されているから、グリーンタイヤの加硫成形時
間を短縮することができる。また、取扱が不便な未加硫
ゴム組成物を有するビード組立体に加硫成形を施すこと
によって、強度が大きく変形しにくいばかりでなく自着
性や異物付着性を消失したビード成形体としているから
、保管や運搬が容易になｈ１グリーンタイヤ組立工程の
機械化や自動化が行いやすくなる。The manufacturing method for the retired tire is to vulcanize the bead assembly in advance to form a bead molded body, and then further vulcanize and mold the assembled green tire using this bead molded body. The arrangement and binding of the beads are maintained almost as they were at the time of bead assembly. Furthermore, the wire is not deformed and the bead filler is less likely to lose its shape. Therefore, according to the present invention, the decrease in strength and uniformity of the bead core is reduced. Furthermore, since the bead assembly is vulcanized in advance prior to vulcanization molding of the green tire, the time required for vulcanization molding of the green tire can be shortened. In addition, by vulcanizing a bead assembly containing an unvulcanized rubber composition that is inconvenient to handle, we have created a bead molded product that not only has high strength and is resistant to deformation, but also has no self-adhesion or foreign matter adhesion. This makes storage and transportation easier, making it easier to mechanize and automate the H1 green tire assembly process.
第１図は、本発明の実施例に係る空気入りタイヤの製造
方法の工程中において、ビード組立体を金型に装填した
状態を示す部分拡大断面図、第２図は、本発明の実施例
に係る製造方法によって得られる空気入りタイヤの断面
図である。
符号の説明
１２・・・ワイヤ、１４・・・ワイヤ被覆、１８・・・
ビードコア、２２・・・ビードフィラー、３０・・・ビ
ード組立体、３２゜３４・・・金型、４０・・・ビード
成形体、７ｏ・・・空気入りタイヤ。
特許出願人 東洋ゴム工業株式会社
□□□−一■■Ｈ−レー――−一一FIG. 1 is a partially enlarged cross-sectional view showing a state in which a bead assembly is loaded into a mold during the process of a pneumatic tire manufacturing method according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view showing an embodiment of the present invention. 1 is a cross-sectional view of a pneumatic tire obtained by the manufacturing method according to FIG. Explanation of symbols 12...Wire, 14...Wire coating, 18...
Bead core, 22... Bead filler, 30... Bead assembly, 32°34... Mold, 40... Bead molded body, 7o... Pneumatic tire. Patent applicant: Toyo Tire & Rubber Industries Co., Ltd.
Claims (1)
てなるビードコアの外周面に未加硫ゴム組成物からなる
ビードフィラーを固着してビード組立体を形成し、この
ビード組立体を予め加硫成形してビード成形体とした後
、このビード成形体を用いて組立てたグリーンタイヤを
更に加硫成形することを特徴とする空気入りタイヤの製
造方法。1. Form a bead assembly by fixing a bead filler made of an unvulcanized rubber composition to the outer circumferential surface of a bead core formed by winding a wire coated with an unvulcanized rubber composition in an annular shape. A method for producing a pneumatic tire, which comprises vulcanizing and molding a bead molding in advance, and then further vulcanizing a green tire assembled using the bead molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63138176A JPH01306233A (en) | 1988-06-03 | 1988-06-03 | Manufacture of pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63138176A JPH01306233A (en) | 1988-06-03 | 1988-06-03 | Manufacture of pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01306233A true JPH01306233A (en) | 1989-12-11 |
Family
ID=15215822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63138176A Pending JPH01306233A (en) | 1988-06-03 | 1988-06-03 | Manufacture of pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01306233A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02106329A (en) * | 1988-10-14 | 1990-04-18 | Bridgestone Corp | Vulcanization of tire for aircraft |
| EP0928680A1 (en) * | 1997-12-30 | 1999-07-14 | Pirelli Pneumatici Societa' Per Azioni | A method for making tyres for vehicle wheels |
| JP2011037167A (en) * | 2009-08-12 | 2011-02-24 | Bridgestone Corp | Method and apparatus for manufacturing bead member |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS503182A (en) * | 1973-04-09 | 1975-01-14 | ||
| JPS55152041A (en) * | 1979-05-17 | 1980-11-27 | Toyo Tire & Rubber Co Ltd | Production of air tire for vehicles |
-
1988
- 1988-06-03 JP JP63138176A patent/JPH01306233A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS503182A (en) * | 1973-04-09 | 1975-01-14 | ||
| JPS55152041A (en) * | 1979-05-17 | 1980-11-27 | Toyo Tire & Rubber Co Ltd | Production of air tire for vehicles |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02106329A (en) * | 1988-10-14 | 1990-04-18 | Bridgestone Corp | Vulcanization of tire for aircraft |
| EP0928680A1 (en) * | 1997-12-30 | 1999-07-14 | Pirelli Pneumatici Societa' Per Azioni | A method for making tyres for vehicle wheels |
| JP2011037167A (en) * | 2009-08-12 | 2011-02-24 | Bridgestone Corp | Method and apparatus for manufacturing bead member |
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