JP2670107B2 - Vulcanizing method for aircraft tires - Google Patents
Vulcanizing method for aircraft tiresInfo
- Publication number
- JP2670107B2 JP2670107B2 JP63258880A JP25888088A JP2670107B2 JP 2670107 B2 JP2670107 B2 JP 2670107B2 JP 63258880 A JP63258880 A JP 63258880A JP 25888088 A JP25888088 A JP 25888088A JP 2670107 B2 JP2670107 B2 JP 2670107B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- tire
- vulcanization
- bead core
- cover rubber
- 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
Landscapes
- Tyre Moulding (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、航空機タイヤの加硫方法とくに、タイヤ
の使用中におけるビード部耐久性、なかでもビードコア
を取囲むカーカスコードのフレッティングによる破損に
対する抵抗性を高めることによって安全な航空運行に寄
与し得る、航空機用タイヤの加硫方法を提案しようとす
るものである。Description: TECHNICAL FIELD The present invention relates to a method for vulcanizing an aircraft tire, particularly to the durability of a bead portion during use of the tire, and in particular to damage to a carcass cord surrounding a bead core due to fretting. It is intended to propose a vulcanization method for aircraft tires, which can contribute to safe air travel by increasing resistance.
（従来の技術） 特開昭61−285104号公報には、航空機用タイヤのビー
ドコアのまわりを被覆保護するため、特定物性のゴムに
有機繊維例えばナイロン、ポリエステル、レーヨンなど
のコードを埋設したコード層よりなる被覆層を用いるこ
とが開示されているが、実際には被覆層内で、タイヤの
形付けに伴って加わるブラダ圧力により被覆層のコード
乱れを生じ易い不利がある。(Prior Art) JP-A-61-285104 discloses a cord layer in which a cord of organic fiber such as nylon, polyester or rayon is embedded in a rubber having specific physical properties in order to coat and protect the periphery of a bead core of an aircraft tire. Although it has been disclosed to use a coating layer composed of the above, in practice, there is a disadvantage that cord turbulence of the coating layer is likely to occur in the coating layer due to the bladder pressure applied as the tire is shaped.
（発明が解決しようとする課題） ビードコアの単なるカバーゴムによる被覆の下でも、
タイヤの成形加硫中に、ゴム流れに由来したカバーゴム
ゲージの不整を来すことがなく、ビードコアのまわりに
一様なゴムゲージを確保することを可能ならしめた航空
機用タイヤの加硫方法を提案することがこの発明の目的
である。(Problems to be solved by the invention) Even under the cover of the bead core with a simple cover rubber,
A method for vulcanizing aircraft tires that makes it possible to secure a uniform rubber gauge around the bead core without causing irregularities in the cover rubber gauge due to rubber flow during tire vulcanization. It is an object of the present invention to make a proposal.
（課題を解決するための手段） この発明は、グリーンケース造成ドラム上にてカーカ
ス用ターンアッププライの層をその両側域につき、予め
カバーゴムの被覆を全周にわたって施したビードコアの
まわりに巻き返し、次に同じくダウンプライの層を重ね
合わせグリーンケースをつくり、このグリーンケースを
トロイダル変形させ乍らそのクラウン域にベルトとトレ
ッドゴムを適用してグリーンタイヤに仕上げ、その後タ
イヤ成形加硫機のモールド内にて加硫するに当り、ビー
ドコアの全周にわたって被覆するカバーゴムの、内表面
側を未加硫のまま、プライと接する外表面側のみに予備
的な半加硫又は加硫処理をグリーンケースの造成段階に
先立って施すことを特徴とする、航空機用タイヤの加硫
方法である。(Means for Solving the Problem) The present invention provides a layer of a carcass turn-up ply on both sides of a green case forming drum, and rewinds it around a bead core that has been covered with a cover rubber in advance over the entire circumference. Next, the layers of down ply are piled up to make a green case, and the green case is toroidally deformed, and the belt and tread rubber are applied to the crown area to finish it into a green tire, and then inside the mold of the tire molding vulcanizer. When vulcanizing with a green case, a preliminary semi-vulcanization or vulcanization process is applied only to the outer surface side of the cover rubber that covers the entire circumference of the bead core while leaving the inner surface side unvulcanized. The method for vulcanizing an aircraft tire is characterized in that the vulcanization method is carried out prior to the step of forming.
この発明で上記予備処理は放射線照射によることがの
ぞましい。In the present invention, the above-mentioned pretreatment is preferably performed by irradiation with radiation.
さて第１図にケーブルコアよりなるを可とするビード
コア１の全周にわたってカバーゴム２による被覆を施し
たそのビードコア１の断面をケーブルワイヤの一部につ
いて図示を省略した状態で示す。ケーブルコアはスチー
ルの環状の心線のまわりにスチールワイヤを粗いリード
で多重に巻きつけた複数のワイヤ層よりなる。Now, FIG. 1 shows a cross section of the bead core 1 which is covered with a cover rubber 2 over the entire circumference of the bead core 1 which may be a cable core, with a part of the cable wire not shown. The cable core consists of multiple layers of steel wire wrapped around a steel annular core in multiple turns with coarse leads.
カバーゴム２は第２図に一例を示すようにビードコア
１に適用する前にゴムストリップ３の状態にて予め片面
からＲで示すような放射線照射を施したのち、それによ
る半加硫又は加硫側を外にして第１図のようにビードコ
ア１の全周にわたって巻きつける。このとき、ゴムスト
リップ３のビードコア１と接する側は未加硫のままなの
で、密着性に格別な問題を生じることはない。The cover rubber 2 is, as shown in FIG. 2 by way of example, before being applied to the bead core 1, radiation is applied from one side in advance in the state of the rubber strip 3 as indicated by R, and then semi-vulcanized or vulcanized. The bead core 1 is wound around the entire circumference as shown in FIG. At this time, since the side of the rubber strip 3 which is in contact with the bead core 1 remains unvulcanized, no particular problem occurs in the adhesion.
このような片面側での半加硫又は加硫を行うことがで
きさえすればその予備処理は、ゴムストリップ３をビー
ドコア１のまわりにまきつけたあとで行ってもよい。As long as such half-vulcanization or vulcanization on one side can be performed, the pretreatment thereof may be performed after the rubber strip 3 is wound around the bead core 1.
このようにして予備処理をしたカバーゴム２による被
覆を施したビードコア１は、図示を省略したがグリーン
ケース造成ドラム上にて、カーカス用ターンアッププラ
イの層をその両側域で巻返す直前にて該プライの層に慣
例どおり適用する。Although not shown, the bead core 1 coated with the cover rubber 2 which has been pretreated in this way is, on the green case forming drum, immediately before the layer of the carcass turn-up ply is rewound on both sides thereof, although not shown. Apply as usual to the layers of the ply.
ターンアッププライの巻返しについてやはり慣例に従
いダウンプライの層と一対のサイドウオールゴム層とを
重ね合わせてグリーンケースをつくる。Regarding the rewinding of the turn-up ply, the down ply layer and the pair of side wall rubber layers are overlapped with each other to make a green case.
なおサイドウオールゴムについては、次のトロイダル
変形を経たあとで貼り合わせることもできる。The side wall rubber may be attached after undergoing the following toroidal deformation.
グリーンケースのトロイダル変形に際しては別途に用
意をしたベルトとトレッドゴムとの複合体をグリーンケ
ース２のクラウン部にはめ合わせて合体し、グリーンタ
イヤに仕上げる段階も通常の工程と同様である。In the case of the toroidal deformation of the green case, the step of fitting a separately prepared composite body of the belt and the tread rubber to the crown portion of the green case 2 to combine them into a green tire is also the same as the normal process.
さてこのグリーンタイヤはタイヤ成形加硫機のモール
ド内に装入し形付け加硫が施されるが、このとき第３図
に要部の断面を示したモールド４の内面に向けブラダ５
内の充てん圧力（矢印参照）によってグリーンタイヤ６
が強く圧迫され、ターンアッププライの層７の巻返し域
にてほぼ半周にわたり取囲まれたビードコア１のカバー
ゴム２はモールド４からの加熱下に圧縮されてゴム流動
を生じるために、カバーゴム２の被覆厚みに不同を来す
不利があったのに反し、ターンアッププライの層７に面
してカバーゴム２の表面側にはこの発明に従い予め半加
硫又は加硫が施されていることによってカバーゴム２に
上記のようなゴム流動は生じないのであり、ここに図に
は示していないが、ターンアッププライの層７の内側
に、いわゆるフリッパーの如きビード保護部材が適用さ
れる場合にあっても同様である。Now, this green tire is loaded into the mold of the tire molding vulcanizer and shaped and vulcanized. At this time, the bladder 5 is directed toward the inner surface of the mold 4 whose cross section is shown in FIG.
Green tire 6 depending on the filling pressure inside (see arrow)
The cover rubber 2 of the bead core 1 which is strongly compressed and is surrounded by the turn-up ply layer 7 for about half the circumference is compressed by heating from the mold 4 to generate a rubber flow. On the contrary, the surface thickness of the cover rubber 2 facing the layer 7 of the turn-up ply is semi-vulcanized or vulcanized in advance according to the present invention, in spite of the disadvantage that the coating thickness of No. 2 is different. As a result, the rubber flow does not occur in the cover rubber 2 as described above, and although not shown here, when a bead protection member such as a so-called flipper is applied inside the layer 7 of the turn-up ply. The same applies to
なお図中８はダウンプライの層である。 In the figure, 8 is a down ply layer.
（作 用） ビードコア１のカバーゴム２がカーカスのターンアッ
ププライの層７に面する外表面にて予備的な半加硫又は
加硫操作を経ているため、タイヤ成形加硫機のモールド
４内における形付け圧力を加熱下に受けても事実上のゴ
ム流動がカバーゴム２に生じることがないので加硫を終
えたあとカバーゴム２のゲージはビードコア１の全周に
わたって一様に確保されることとなる。(Working) Since the cover rubber 2 of the bead core 1 has undergone a preliminary semi-vulcanization or vulcanization operation on the outer surface facing the layer 7 of the carcass turn-up ply, the inside of the mold 4 of the tire molding vulcanizer Since the cover rubber 2 does not practically flow into the cover rubber 2 even if it is subjected to the shaping pressure at the heating point in FIG. It will be.
実施例 サイズH46×18.0 R20の航空機用空気入りタイヤを次
の条件で試作し、加硫を経たのちにビードコア１とター
ンアッププライの層７との間のゴムゲージを第４図に模
式図に示したところにおいてa,b,cの３か所で計測（周
上８等分位置での平均値）し、この発明に従う実施例1,
2と従来法による比較例とについて対比をした。Example A pneumatic tire for aircraft of size H46 × 18.0 R20 was prototyped under the following conditions, and after being vulcanized, a rubber gauge between the bead core 1 and the turn-up ply layer 7 is shown in FIG. 4 in a schematic diagram. Example 1 according to the present invention was measured at three points a, b, and c (average value at eight equally divided positions on the circumference)
2 and the comparative example by the conventional method were compared.
カーカス 構造 アップ・ダウンプライ コード種ナイロン66（1890d/3） ビードコア ケーブルコア構造１×5mm＋（10＋16＋22＋28）×2.2mm カバーゴム 配 合 NR/IRブレンド 物 性 100％Mod.:75kg/cm2 加硫条件 温度 160℃ 時間95分間 圧力 21kgf/cm2 カバーゴムの予備処理は表１のとおりである。Carcass structure Up / down ply Cord type Nylon 66 (1890d / 3) Bead core Cable core structure 1 x 5mm + (10 + 16 + 22 + 28) x 2.2mm Cover rubber combination NR / IR blend Physical properties 100% Mod .: 75kg / cm 2 Vulcanization conditions Temperature 160 ℃ Time 95 minutes Pressure 21kgf / cm 2 The pretreatment of cover rubber is shown in Table 1.
次に各試作タイヤは120％荷重を負荷した状態におけ
るタキシング走行に相当のドラム試験（内圧200PSI,速
度40MPH,荷重53040LBS,走行距離35000FT/回）を15回分
行い、この試験のあとビード部を切断して採寸したビー
ドコアに沿うセパレーションの発生長さ及びゴムゲージ
分布を表２に併記した。 Next, each prototype tire was subjected to a drum test (internal pressure 200PSI, speed 40MPH, load 53040LBS, mileage 35000FT / cycle) equivalent to taxing running under a load of 120% for 15 times, after which the bead section was cut. Table 2 also shows the length of separation and the rubber gauge distribution along the bead cores that were measured.
（発明の効果） この発明によれば、ラジアルコード配列カーカス構造
それもとくにアップダウン方式で適用される航空機用空
気入りラジアルタイヤのビードコアとターンアッププラ
イの層との間におけるゴムゲージを、通常の成形加硫機
を用いる形付け加硫の間におけるゴム流動の抑制によっ
て、適切に確保して、この種タイヤのビード部耐久性の
改善に著しい効果がもたらされる。 (Effect of the Invention) According to the present invention, a radial cord array carcass structure, which is also an up-down system, is used to form a rubber gauge between a bead core of a pneumatic radial tire for an aircraft and a layer of a turn-up ply by a normal molding. The suppression of rubber flow during shaping and vulcanization using a vulcanizer, when properly secured, has a significant effect on improving the bead durability of this type of tire.
第１図はビードコアの断面図、 第２図はゴムストリップの予備加硫要領の説明図、 第３図は成形加硫モールド内での変形挙動説明図であ
り、 第４図はゴムゲージの採寸要領説明図である。 １……ビードコア、２……カバーゴム ３……ゴムストリップ、４……モールド ５……プラダ、６……グリーンタイヤ ７……ターンアッププライの層 ８……ダウンプライの層FIG. 1 is a cross-sectional view of a bead core, FIG. 2 is an explanatory view of a pre-vulcanization procedure of a rubber strip, FIG. 3 is an explanatory view of deformation behavior in a molding vulcanization mold, and FIG. 4 is a rubber gauge measurement procedure. FIG. 1 ... Bead core, 2 ... Cover rubber 3 ... Rubber strip, 4 ... Mold 5 ... Prada, 6 ... Green tire 7 ... Turn-up ply layer 8 ... Down-ply layer
Claims (2)
用ターンアッププライの層をその両側域につき、予めカ
バーゴムの被覆を全周にわたって施したビードコアのま
わりに巻き返し、次に同じくダウンプライの層を重ね合
わせグリーンケースをつくり、このグリーンケースをト
ロイダル変形させ乍らそのクラウン域にベルトとトレッ
ドゴムを適用してグリーンタイヤに仕上げ、その後タイ
ヤ成形加硫機のモールド内にて加硫するに当り、 ビードコアの全周にわたって被覆するカバーゴムの、内
表面側を未加硫のまま、プライと接する外表面側のみに
予備的な半加硫又は加硫処理をグリーンケースの造成段
階に先立って施すことを特徴とする、航空機用タイヤの
加硫方法。1. A carcass turn-up ply layer on both sides of a green case forming drum is rewound around a bead core which has been covered in advance with a cover rubber, and then a down-ply layer is also formed. When making a laminated green case, applying a belt and tread rubber to the crown area of this green case by toroidal deformation to finish it into a green tire, and then vulcanizing it in the mold of the tire molding vulcanizer, Prior to the green case construction stage, a preliminary semi-vulcanization or vulcanization treatment is applied only to the outer surface side of the cover rubber that covers the entire circumference of the bead core while the inner surface side of the cover rubber remains unvulcanized. A method for vulcanizing an aircraft tire, which comprises:
よるものである、請求項１に記載した加硫方法。2. The vulcanization method according to claim 1, wherein the pretreatment of the cover rubber is performed by irradiation with radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63258880A JP2670107B2 (en) | 1988-10-14 | 1988-10-14 | Vulcanizing method for aircraft tires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63258880A JP2670107B2 (en) | 1988-10-14 | 1988-10-14 | Vulcanizing method for aircraft tires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02106329A JPH02106329A (en) | 1990-04-18 |
| JP2670107B2 true JP2670107B2 (en) | 1997-10-29 |
Family
ID=17326313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63258880A Expired - Lifetime JP2670107B2 (en) | 1988-10-14 | 1988-10-14 | Vulcanizing method for aircraft tires |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2670107B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5536492B2 (en) * | 2010-03-01 | 2014-07-02 | 株式会社ブリヂストン | Composite, method for producing the composite, bead core and tire using the composite, and method for producing the tire |
| CN114193807A (en) * | 2021-12-29 | 2022-03-18 | 中国化工集团曙光橡胶工业研究设计院有限公司 | Forming method of radial aircraft tire bead |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01306233A (en) * | 1988-06-03 | 1989-12-11 | Toyo Tire & Rubber Co Ltd | Manufacture of pneumatic tire |
-
1988
- 1988-10-14 JP JP63258880A patent/JP2670107B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02106329A (en) | 1990-04-18 |
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