JPH0740715A - Bead for tire - Google Patents

Bead for tire

Info

Publication number
JPH0740715A
JPH0740715A JP5190325A JP19032593A JPH0740715A JP H0740715 A JPH0740715 A JP H0740715A JP 5190325 A JP5190325 A JP 5190325A JP 19032593 A JP19032593 A JP 19032593A JP H0740715 A JPH0740715 A JP H0740715A
Authority
JP
Japan
Prior art keywords
bead
tire
wire
rubber layer
cross
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.)
Granted
Application number
JP5190325A
Other languages
Japanese (ja)
Other versions
JP3266704B2 (en
Inventor
Hitoshi Kinoshita
等 木下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ohtsu Tire and Rubber Co Ltd
Original Assignee
Ohtsu Tire and Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ohtsu Tire and Rubber Co Ltd filed Critical Ohtsu Tire and Rubber Co Ltd
Priority to JP19032593A priority Critical patent/JP3266704B2/en
Publication of JPH0740715A publication Critical patent/JPH0740715A/en
Application granted granted Critical
Publication of JP3266704B2 publication Critical patent/JP3266704B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04Bead cores
    • B60C2015/044Bead cores characterised by a wrapping layer

Landscapes

  • Tires In General (AREA)

Abstract

PURPOSE:To prevent the section form collapse of a bead, improve the fitting property to wheel rims and the durability of the bead and reduce the cost. CONSTITUTION:This bead 1 is buried in a tire bead member, and wound to a carcass ply. In this bead 1, bead wires 8 made by covering the periphery of wire materials 6 with thin rubber layers 7 are wound and adhered closely in a specific section form (rectangular form, for example), in plural lines and in plural steps, and rubber layers 9 are adhered to both side surfaces of the bead 1 in the axial direction of its section.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、自動車等のタイヤに用
いられるビードに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to beads used for tires of automobiles and the like.

【0002】[0002]

【従来の技術】一般に、タイヤは、ビードを夫々埋入し
た左右一対のビード部をサイドウオール部およびトレッ
ド部で連接して断面トロイダル状とされる。例えば、ラ
ジアルタイヤの製造工程は、図3(a),(b),
(c),(d)に示すように、カーカスプライ層(カー
カスコード)10で左右一対のビード11(ビードコア
ともいう)を内側より巻込んでビードフイラーゴム12
と共に図3(a)に示すようにタイヤ成型機に装着し、
予め成形された対のサイド部ゴム層13を、そのストリッ
プ13C がビードフィラーゴム12を外側から覆うように貼
り付ける。このように成形されたケーシングを、図3
(b)に示すように、所望の外径寸法になるまでインフ
レートする。
2. Description of the Related Art Generally, a tire has a toroidal cross section in which a pair of left and right bead portions, in which beads are embedded, are connected by a side wall portion and a tread portion. For example, the manufacturing process of a radial tire is as shown in FIGS.
As shown in (c) and (d), a pair of left and right beads 11 (also referred to as bead cores) are wound from inside by a carcass ply layer (carcass cord) 10 to form a bead filler rubber 12.
Along with the tire molding machine as shown in Figure 3 (a),
The pair of preformed side rubber layers 13 are attached so that the strips 13C cover the bead filler rubber 12 from the outside. The casing molded in this way is shown in FIG.
As shown in (b), inflate to a desired outer diameter.

【0003】次に、図3(c)に示すように、クラウン
部にブレーカ層14を貼付け、さらに、図3(d)に示す
ように、ブレーカ層14の上にトレッドゴム層15を貼着
し、トレッドゴム層15の側縁ゴム15a でサイド部ゴム層
13のストリップ部13c を覆うことにより、成形作業が完
了し、その後加硫機により加硫成形される。従来、前記
ビード11は、図4(b)に示すように、線材16の外周を
所要厚さのゴム層17で被覆したビードワイヤ18を、図4
(a)に示すように、四角(又は六角ほか)形断面にな
るように、かつ所定の間隔でグロメットゴム19内に5列
(又は、4,6列)、5段(又は、4,6段)に巻回埋
入したものが使用されている。
Next, as shown in FIG. 3 (c), a breaker layer 14 is attached to the crown portion, and further, as shown in FIG. 3 (d), a tread rubber layer 15 is attached onto the breaker layer 14. The side edge rubber layer 15a of the tread rubber layer 15
The molding operation is completed by covering the strip portion 13c of 13 and then vulcanization molded by a vulcanizer. Conventionally, the bead 11 has a bead wire 18 in which the outer circumference of a wire 16 is covered with a rubber layer 17 having a required thickness as shown in FIG.
As shown in (a), the grommet rubber 19 has 5 rows (or 4, 6 rows), 5 rows (or 4, 6) in a square (or hexagonal) cross section and at a predetermined interval. It is used by embedding it in a roll.

【0004】[0004]

【発明が解決しようとする課題】ところで、上記従来技
術では、前述したインフレート時、ビード11にボデイプ
ライローテーションによる形状崩れを生じる。即ち、図
5(a)に示すように、インフレート時に、ビード11に
巻掛けているカーカスコード10が、インフレートに伴
い、図中矢示の方向に動くボデイプライローテーション
が生じ、これによってビードワイヤ18間にあるゴム層19
が変形し、ビード11の図中(イ)、(ロ)、(ハ)で示
す部分のワイヤ18が矢印方向に引きずられ、図5(b)
に2点鎖線で示すように、ビード11の四角形断面が略五
角形断面に変形する。
By the way, in the above-mentioned conventional technique, the shape of the bead 11 is deformed due to the body ply rotation during the inflation. That is, as shown in FIG. 5A, at the time of inflation, the carcass cord 10 wound around the bead 11 causes body ply rotation that moves in the direction of the arrow in the figure due to the inflation, which causes the bead wire 18 to move. Rubber layer 19 between
Is deformed, and the wire 18 of the portion of the bead 11 shown in (a), (b) and (c) in the figure is dragged in the direction of the arrow, and as shown in FIG.
As shown by the chain double-dashed line, the square section of the bead 11 is transformed into a substantially pentagonal section.

【0005】そして、ビード11の中心(C)に対して、
左側のゲージD1より右側のゲージD2が大きくなり、
ビード部内周ゲージEが不安定となってユニフォミティ
が悪くなるため、自動車の車輪リムにタイヤをセットし
たとき、嵌合性が悪くなり、FV(フォースバリエーシ
ョン)への不都合が生じ、耐久性が低下するなどの問題
がある。
Then, with respect to the center (C) of the bead 11,
The gauge D2 on the right becomes larger than the gauge D1 on the left,
Since the inner circumference gauge E of the bead portion becomes unstable and the uniformity deteriorates, when the tire is set on the wheel rim of the automobile, the fitting property is deteriorated, which causes inconvenience to FV (force variation) and lowers the durability. There is a problem such as doing.

【0006】このため、リムセット時のタイヤ嵌合性へ
の影響を考慮して、厚織コードをビードに巻くと、ビー
ドが太くなると共にビードフィラーも大きくなるため、
重量過大となるだけでなく、コスト高になる等の問題が
ある。そこで、本発明は、上述のような実状に鑑みてな
されたもので、その目的とするところは、ボデイプライ
ローテーションによってビードの断面形状崩れを防止す
ると共に、車輪リムへの嵌合性および耐久性の向上並び
にコスト低下を図ることができるタイヤ用ビードを提供
するにある。
Therefore, when the thick woven cord is wound around the bead in consideration of the influence on the tire fitting property at the time of setting the rim, the bead becomes thick and the bead filler also becomes large.
There is a problem that not only the weight becomes excessive but also the cost becomes high. Therefore, the present invention has been made in view of the above-described actual circumstances, and an object thereof is to prevent the cross-sectional shape of the bead from collapsing due to the body ply rotation, and to fit and durability the wheel rim. To provide a bead for a tire, which can improve the cost and reduce the cost.

【0007】[0007]

【課題を解決するための手段】本発明では、上記目的を
達成するために、次の技術的手段を講じた。即ち、本発
明は、タイヤビード部に埋入されているとともに、カー
カスプライに巻込まれるビードにおいて、前記ビード
は、線材外周を薄いゴム層で被覆したビードワイヤー
を、所定断面形状に複数列、複数段密接状に巻装接着す
ると共に、その所定断面の外周面の適所に、所定厚さの
ゴム層を配設してなることを特徴としている。
In order to achieve the above object, the present invention takes the following technical means. That is, the present invention is a bead that is embedded in a tire bead portion and is wound around a carcass ply, wherein the bead is a bead wire in which a wire material outer periphery is covered with a thin rubber layer, a plurality of rows having a predetermined cross-sectional shape, and a plurality of rows. It is characterized in that it is wound and adhered in a step-like manner and a rubber layer having a predetermined thickness is disposed at a proper position on the outer peripheral surface of the predetermined cross section.

【0008】[0008]

【作用】本発明によれば、ビードの各ビードワイヤが相
互に密着しているので、インフレート時のボデイプライ
のローテーションによってビードワイヤが引きずられる
ことがなく、したがってビードが変形は少なく、埋入位
置および姿勢が安定し、しかも外周部ゴム層によって潤
滑又は緩衝機能を奏することで、ボデイプライローテー
ションがスムーズに行われ、左右一対のビード間のカー
カスプライが波打つことなく十分に緊張する。
According to the present invention, since the bead wires of the bead are in close contact with each other, the bead wire is not dragged by the rotation of the body ply at the time of inflation, and therefore the bead is not deformed so much that the embedding position and posture are improved. Is stable and the outer peripheral rubber layer has a lubricating or cushioning function, so that the body ply rotation is smoothly performed and the carcass ply between the pair of left and right beads is sufficiently tensioned without waviness.

【0009】[0009]

【実施例】以下、本発明の実施例を図面に基づき説明す
る。図1および図2は、本発明の実施例を示し、ビード
1 は従来技術として説明した図3(a)〜(d)に示す
タイヤ製造に用いられるものであり、タイヤビード部4
内に埋入されていて、このビード1 上のビードフィラー
ゴム5 と共にカーカスコード2 の両端部3 が巻込み埋入
されている。
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, in which the bead
Reference numeral 1 denotes a tire bead portion 4 which is used for manufacturing the tire shown in FIGS.
Both ends 3 of the carcass cord 2 are embedded along with the bead filler rubber 5 on the bead 1.

【0010】左右一対のビード部4 は、図外のサイドウ
ォール部およびトレッド部で連接して断面トロイダル状
のタイヤ本体が形成される。ビード1 は、図1(b)に
示す線材6 の外周に薄いゴム層7 で被覆したビードワイ
ヤ8 を、図1(a)に示すように、複数列・複数段(5
列、5段)にかつ断面形状が四角形になるように密接状
に巻装接着してリング状のワイヤ集合体とし、該集合体
の軸線方向両側に、所定厚さのゴム層9 を接着一体化し
たものである。
The pair of left and right bead portions 4 are connected to each other by a sidewall portion and a tread portion (not shown) to form a tire main body having a toroidal cross section. The bead 1 includes a bead wire 8 having a thin rubber layer 7 coated on the outer periphery of a wire rod 6 shown in FIG. 1 (b), as shown in FIG. 1 (a).
To form a ring-shaped wire assembly by winding and adhering in close contact with each other so that the cross-sectional shape becomes a quadrangle, and a rubber layer 9 having a predetermined thickness is integrally bonded on both sides in the axial direction of the assembly. It has been transformed.

【0011】具体的には、ビードワイヤ8 は、その線材
6 の線径を従来同様の0.96mmとし、これに被覆されたゴ
ム層7 の厚さを0.02mm (従来のゴム厚0.07mm) として、
ワイヤ径1.00mm (従来は1.1mm)としてあり、ワイヤ集合
体の断面が 5mm角となっている。ワイヤ集合体を軸線方
向両側のゴム層9 は、グロメットゴムを 0.5mmの厚さと
してあり、ビード1 断面寸法が 5mm×6mm となってい
る。なお、本発明実施例のビード断面積は30mm2 で、従
来のビード断面積30.25mm2よりも若干小さくすることが
できる。
Specifically, the bead wire 8 is a wire rod
The wire diameter of 6 is 0.96 mm as in the past, and the thickness of the rubber layer 7 coated on it is 0.02 mm (conventional rubber thickness 0.07 mm).
The wire diameter is 1.00 mm (1.1 mm in the past), and the cross section of the wire assembly is 5 mm square. The rubber layer 9 on both sides of the wire assembly in the axial direction is made of grommet rubber with a thickness of 0.5 mm, and the bead 1 cross-sectional dimension is 5 mm × 6 mm. Incidentally, the bead cross-sectional area of the present invention embodiment is 30 mm 2, can be slightly smaller than a conventional bead cross-sectional area 30.25mm 2.

【0012】前記ビード1 のタイヤのビード部4 に埋入
して形成されたタイヤ本体を、加硫成形機により加硫す
ると、ケーステンションが大きい場合でも、インフレー
トによってカーカスプライ2 の端部3 が図2に矢印で示
す方向にローテーションする際、ゴム層9 がクッション
(又は潤滑) の役目をして、スムーズにローテーション
すると共に、各ビードワイヤ8 が相互に密着し、しかも
被覆ゴム層7 の厚さが薄いために、図中 (イ) 、 (ロ)
、 (ハ) で示す部分のビードワイヤ8 がカーカスプラ
イ2 等により引きずられることが少なく、もって、形崩
れが生じない。
When the tire main body formed by embedding in the bead portion 4 of the tire of the bead 1 is vulcanized by a vulcanization molding machine, even if the case tension is large, the end portion 3 of the carcass ply 2 is inflated due to inflation. When the rubber rotates in the direction shown by the arrow in Fig. 2, the rubber layer 9
(Or lubrication), rotate smoothly, the bead wires 8 are in close contact with each other, and the thickness of the covering rubber layer 7 is thin, so (a) and (b) in the figure.
, (C) are less likely to be dragged by the bead wire 8 by the carcass ply 2 and the like, so that the shape is not deformed.

【0013】上記実施例において、その効果を従来のも
のと比較すると、次表のとおりであり、指数の小さい本
実施例の方が優れている。
In the above-mentioned embodiment, the effect is compared with the conventional one, as shown in the following table, and this embodiment with a smaller index is superior.

【0014】[0014]

【表1】 [Table 1]

【0015】即ち、上表から明らかなように、本実施例
によれば、ビード1 中心に対する軸線方向ゲージD1、D2
の差が小さく、ビード1 がビード部4 の中央にセットさ
れており、ビード部4 の内周側ゴムゲージEのバラツキ
が少なく、タイヤのユニフォミティが良く、また、タイ
ヤをリムにセットした場合の嵌合性が向上している。な
お、ビード部4 の内周面が、車輪のリムのビード受座に
接触する圧力、即ち嵌合圧分布を測定した結果、均一な
圧力分布が得られた。また、前記嵌合性の向上によっ
て、タイヤ性能特にRFVが良好となった。
That is, as apparent from the above table, according to the present embodiment, the axial gauges D1 and D2 with respect to the center of the bead 1 are provided.
Difference is small, the bead 1 is set in the center of the bead part 4, the inner peripheral side rubber gauge E of the bead part 4 has little variation, the uniformity of the tire is good, and the fit when the tire is set on the rim. Compatibility is improved. As a result of measuring the pressure at which the inner peripheral surface of the bead portion 4 contacts the bead seat of the rim of the wheel, that is, the fitting pressure distribution, a uniform pressure distribution was obtained. In addition, the improved fitting property improved tire performance, particularly RFV.

【0016】さらに、タイヤ内ビード1 間のカーカスプ
ライ2 が、十分に緊張するため、カーカスプライ2 が波
打ち状にならず、自動車に装着して走行するときの操縦
安定性を向上させることができる。更に、ボデイプライ
ローテーションがスムーズに行われるため、カーカスプ
ライのエクスパンションを、従来に比して、0.5 〜1.5
% (成形機幅で約 5mm) きつめにすることができる。
Further, since the carcass ply 2 between the bead 1 in the tire is sufficiently tensioned, the carcass ply 2 does not have a wavy shape, and it is possible to improve the steering stability when the vehicle is mounted on a vehicle for traveling. . Furthermore, since the body ply rotation is performed smoothly, the expansion of the carcass ply is 0.5 to 1.5 times that of the conventional model.
% (Molding machine width approx. 5 mm) Can be tightened.

【0017】また、本発明実施例によれば、ビードワイ
ヤ8 とカーカスプライ2 およびその端部3 との間にゴム
層9 があるため、カーカスプライ2 がビードワイヤ8 に
よって摺れたとしてもゴム層9 で潤滑されることから、
カーカスプライ2 のエクスパンションをきつめにして
も、図2に(イ)、(ロ)、(ハ)で示す部分のビード
ワイヤ8 が引きずられることがなく、形崩れが少なく、
コードの破断を防止できる。
Further, according to the embodiment of the present invention, since the rubber layer 9 is provided between the bead wire 8 and the carcass ply 2 and the end portion 3, even if the carcass ply 2 is rubbed by the bead wire 8, the rubber layer 9 Since it is lubricated with
Even if the expansion of the carcass ply 2 is tight, the bead wire 8 in the parts shown in (a), (b) and (c) in FIG.
It is possible to prevent the cord from breaking.

【0018】本発明は、上記実施例に限定されるもので
はなく、ビード1 の断面形状は六角形、八角形等とする
ことができ、また、ラジアルタイヤ以外の各種タイヤに
も採用可能である。
The present invention is not limited to the above embodiment, but the bead 1 may have a hexagonal shape, an octagonal shape or the like in cross section, and can be applied to various tires other than the radial tire. .

【0019】[0019]

【発明の効果】本発明は、上述のように、タイヤビード
部に埋入されているとともに、カーカスプライに巻込ま
れるビードにおいて、前記ビードは、線材外周を薄いゴ
ム層で被覆したビードワイヤーを、所定断面形状に複数
列、複数段密接状に巻装接着すると共に、その所定断面
の外周面の適所に、所定厚さのゴム層を配設してなるこ
とを特徴とするものであるから、ビードのボデイプライ
ローテーションを良好にしてビード断面形状崩れを防止
してタイヤユニフォミティを良くすることができると共
に、タイヤの車輪リムへの嵌合性が良くなり、厚織コー
ド等の巻装が不要で、断面積を小さくでき、したがって
ビードフイラーが小さくなってコスト低下を図ることが
でき、また、ビード部の耐久性を高めることが可能であ
る。
As described above, the present invention relates to a bead embedded in a tire bead portion and wound around a carcass ply, wherein the bead is a bead wire whose outer circumference is covered with a thin rubber layer, In a predetermined cross-sectional shape, a plurality of rows, a plurality of steps are closely wound and adhered, and a rubber layer having a predetermined thickness is arranged at an appropriate position on the outer peripheral surface of the predetermined cross section. By improving the body ply rotation of the bead to prevent the bead cross-sectional shape from collapsing and improving the tire uniformity, the fitting property to the wheel rim of the tire is improved and winding of thick woven cord etc. is unnecessary. The cross-sectional area can be reduced, the bead filler can be reduced to reduce the cost, and the durability of the bead portion can be increased.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例を示し、(a)はビード断面
図、(b)はビードワイヤの拡大断面図である。
FIG. 1 shows an embodiment of the present invention, (a) is a bead cross-sectional view, and (b) is an enlarged cross-sectional view of a bead wire.

【図2】同実施例のタイヤへの埋入状態を示す要部断面
図である。
FIG. 2 is a cross-sectional view of essential parts showing a state of being embedded in the tire of the example.

【図3】(a)〜(d)はラジアルタイヤの製造工程の
1例を示す断面図である。
3 (a) to 3 (d) are cross-sectional views showing an example of a manufacturing process of a radial tire.

【図4】従来例を示し、(a)はビード断面図、(b)
はビードワイヤの拡大断面図である。
FIG. 4 shows a conventional example, (a) is a bead cross-sectional view, (b).
FIG. 4 is an enlarged cross-sectional view of a bead wire.

【図5】従来例のタイヤへの埋入状態を示し、(a)は
要部断面図、(b)はビードの断面形崩れ状態説明図で
ある。
5A and 5B show a state of being embedded in a tire of a conventional example, FIG. 5A is a sectional view of a main part, and FIG.

【符号の説明】[Explanation of symbols]

1 ビード 2 カーカスプライ 4 ビード部 6 線材 7 ゴム層 8 ビードワイヤ 9 ゴム層 1 bead 2 carcass ply 4 bead part 6 wire rod 7 rubber layer 8 bead wire 9 rubber layer

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 タイヤビード部に埋入されているととも
に、カーカスプライに巻込まれるビードにおいて、前記
ビードは、線材外周を薄いゴム層で被覆したビードワイ
ヤーを、所定断面形状に複数列、複数段密接状に巻装接
着すると共に、その所定断面の外周面の適所に、所定厚
さのゴム層を配設してなることを特徴とするタイヤ用ビ
ード。
1. A bead embedded in a tire bead part and wound around a carcass ply, wherein the bead wire has a wire rod outer periphery covered with a thin rubber layer, and the bead wire has a predetermined cross-sectional shape in a plurality of rows and a plurality of steps. A bead for a tire, which is formed by closely windingly adhering and arranging a rubber layer having a predetermined thickness at an appropriate position on an outer peripheral surface of a predetermined cross section.
JP19032593A 1993-07-30 1993-07-30 Bead for tire Expired - Fee Related JP3266704B2 (en)

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JP19032593A JP3266704B2 (en) 1993-07-30 1993-07-30 Bead for tire

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Application Number Priority Date Filing Date Title
JP19032593A JP3266704B2 (en) 1993-07-30 1993-07-30 Bead for tire

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JP3266704B2 JP3266704B2 (en) 2002-03-18

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09207525A (en) * 1996-02-09 1997-08-12 Aichi Tire Kogyo Kk Pneumatic type cushion tire
WO2004011283A1 (en) * 2002-07-30 2004-02-05 The Yokohama Rubber Co.,Ltd. Tire/wheel assembly
WO2011122450A1 (en) * 2010-03-30 2011-10-06 株式会社ブリヂストン Tire manufacturing method, tire, and tire forming mold
JP2011207157A (en) * 2010-03-30 2011-10-20 Bridgestone Corp Method of manufacturing tire, and tire
EP3643489A4 (en) * 2017-06-19 2021-03-10 Bridgestone Corporation Production method for bead core

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09207525A (en) * 1996-02-09 1997-08-12 Aichi Tire Kogyo Kk Pneumatic type cushion tire
WO2004011283A1 (en) * 2002-07-30 2004-02-05 The Yokohama Rubber Co.,Ltd. Tire/wheel assembly
WO2011122450A1 (en) * 2010-03-30 2011-10-06 株式会社ブリヂストン Tire manufacturing method, tire, and tire forming mold
JP2011207157A (en) * 2010-03-30 2011-10-20 Bridgestone Corp Method of manufacturing tire, and tire
US9649819B2 (en) 2010-03-30 2017-05-16 Bridgestone Corporation Tire manufacturing method using jig to fix covered bead inside tire mold
EP3643489A4 (en) * 2017-06-19 2021-03-10 Bridgestone Corporation Production method for bead core

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