JPH11170822A - Manufacture of pneumatic tire and bead core for this pneumatic tire - Google Patents
Manufacture of pneumatic tire and bead core for this pneumatic tireInfo
- Publication number
- JPH11170822A JPH11170822A JP9361811A JP36181197A JPH11170822A JP H11170822 A JPH11170822 A JP H11170822A JP 9361811 A JP9361811 A JP 9361811A JP 36181197 A JP36181197 A JP 36181197A JP H11170822 A JPH11170822 A JP H11170822A
- Authority
- JP
- Japan
- Prior art keywords
- ring
- wire
- continuous
- pneumatic tire
- circumferential
- 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
Links
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
- B29D2030/487—Forming devices for manufacturing the beads
Landscapes
- Tyre Moulding (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、空気入りタイヤ
および該空気入りタイヤ用ビードコアの製造方法に関す
る。The present invention relates to a pneumatic tire and a method for manufacturing a bead core for the pneumatic tire.
【０００２】[0002]
【従来の技術】従来、空気入りタイヤのビード部には、
例えば図６、７に示すような断面が六角形をしたビード
コア11が埋設されているが、このようなビードコア11
は、非伸張性の素線12、例えばスチール単線を複数回リ
ング状に巻回することで形成され、周方向に実質上平行
でほぼ１周に亘ってリング状に延びるとともに、互いに
同軸関係を保って密着配置された複数のリング部13と、
前記素線12と同一の素線12から構成され、隣接する２つ
のリング部13のうち一方のリング部13の周方向終端14か
ら他方のリング部13の周方向始端15まで周方向に対して
傾斜しながら延びることで両リング部13を連続させる複
数の連続部16とからなる素線層17を、複数層積層するこ
とで構成していた。そして、このようなビードコア11の
各素線層17においては、連続部16の周方向位置を後巻ほ
ど遅れるようずらし、連続部16の位置を周方向に分散さ
せるようにしていた。2. Description of the Related Art Conventionally, a bead portion of a pneumatic tire includes:
For example, a bead core 11 having a hexagonal cross section as shown in FIGS.
Is formed by winding a non-stretchable wire 12, for example, a single steel wire, in a ring shape a plurality of times, extending substantially in a circumferential direction substantially parallel to the ring shape, and forming a coaxial relationship with each other. A plurality of ring portions 13 that are closely placed while being held;
The wire 12 is composed of the same wire 12 as the wire 12 and extends from a circumferential end 14 of one of the ring portions 13 to a circumferential start end 15 of the other ring portion 13 of two adjacent ring portions 13 in the circumferential direction. A plurality of element layers 17 each composed of a plurality of continuous portions 16 that extend while being inclined and connect both ring portions 13 are formed by stacking a plurality of layers. In each of the strand layers 17 of such a bead core 11, the circumferential position of the continuous portion 16 is shifted so as to be delayed in the later winding so that the position of the continuous portion 16 is dispersed in the circumferential direction.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の空気入りタイヤにあっては、前述のように連
続部16の周方向位置が後巻ほど遅れるようずれているた
め、任意のリング部13と該リング部13に連続している連
続部16との合計長は１周長より前記ずれ量だけ短く、こ
の結果、１枚の素線層17内における素線12の巻取り数が
少なくなってビード耐久性が低くなってしまうという問
題点がある。しかも、前述のようにずれを設けると、隣
接する連続部16間に平行四辺形の空隙18が形成されるた
め、連続部16近傍の素線12が変形したりずれ易くなり、
この結果、ビードコア11がタイヤ走行時に大きな外力を
受けると、ビードコア11の形状が崩れてビード耐久性が
さらに低下するという問題点もある。However, in such a conventional pneumatic tire, as described above, the circumferential position of the continuous portion 16 is shifted so as to be delayed toward the rear winding. The total length of the wire 13 and the continuous portion 16 continuous with the ring portion 13 is shorter than the one circumference by the above-mentioned shift amount. As a result, the number of windings of the wire 12 in one wire layer 17 is small. As a result, there is a problem that the bead durability is lowered. Moreover, when the displacement is provided as described above, the parallelogram-shaped gap 18 is formed between the adjacent continuous portions 16, so that the strand 12 near the continuous portion 16 is easily deformed or displaced,
As a result, when the bead core 11 receives a large external force during tire running, there is also a problem that the shape of the bead core 11 is broken and the bead durability is further reduced.
【０００４】この発明は、ビードコアにおける素線巻取
り数の増大および形状崩れの防止を図ることができる空
気入りタイヤおよび該空気入りタイヤ用ビードコアの製
造方法を提供することを目的とする。[0004] It is an object of the present invention to provide a pneumatic tire and a method of manufacturing a bead core for the pneumatic tire, which can increase the number of windings of the bead core and prevent shape collapse.
【０００５】[0005]
【課題を解決するための手段】このような目的は、第１
に、非伸張性の素線から構成され、周方向に実質上平行
でほぼ１周に亘ってリング状に延びるとともに、互いに
同軸関係を保って密着配置された複数のリング部と、前
記素線と同一の素線から構成され、隣接する２つのリン
グ部のうち一方のリング部の周方向終端から他方のリン
グ部の周方向始端まで周方向に対して傾斜しながら延び
ることで両リング部を連続させる複数の連続部とからな
る素線層を、複数層積層することで構成したビードコア
をビード部に有する空気入りタイヤにおいて、各素線層
における連続部の周方向位置を該素線層内において同一
とすることで該連続部を密着配置するようにした空気入
りタイヤにより、第２に、非伸張性の素線を周方向と実
質上平行にほぼ１周に亘って巻回することでリング状を
したリング部を形成した後、前記素線を周方向に対して
傾斜させながら前記リング部の周方向始端の側面に密着
するまでさらに巻回して連続部を形成する作業を繰り返
し行うことにより、複数のリング部が互いに同軸関係を
保って密着配置されるとともに、隣接する２つのリング
部のうち一方のリング部の周方向終端と他方のリング部
の周方向始端とが連続部で連続された素線層を形成する
際、前記連続部の周方向位置を同一とすることで該連続
部を密着配置するとともに、このようにして形成された
素線層を複数層積層することでビードコアを製造するよ
うにした空気入りタイヤ用ビードコアの製造方法により
達成することができる。SUMMARY OF THE INVENTION The purpose of the invention is as follows.
A plurality of ring portions, each of which is formed of a non-stretchable wire, extends substantially in a ring substantially substantially in the circumferential direction, and extends in a ring shape over substantially one circumference, and is arranged in close contact with each other while maintaining a coaxial relationship with each other; Of the two adjacent ring portions from the circumferential end of one of the ring portions to the circumferential start end of the other ring portion while being inclined with respect to the circumferential direction to extend both ring portions. In a pneumatic tire having a bead core having a bead core formed by laminating a plurality of continuous wire sections and a plurality of continuous sections, in a pneumatic tire, the circumferential position of the continuous section in each of the wire layers is set in the wire layer. Secondly, by inflating the non-extensible element wire substantially in parallel with the circumferential direction over substantially one round by the pneumatic tire in which the continuous portion is arranged in close contact by making the same. Form a ring-shaped ring After that, by repeating the work of forming a continuous portion by further winding the wire while inclining the wire with respect to the circumferential direction until the wire is in close contact with the side surface of the circumferential start end of the ring portion, a plurality of ring portions are mutually A coaxial relationship is maintained, and a wire layer is formed in which the circumferential end of one of the two adjacent ring portions and the circumferential start of the other ring portion are continuous in a continuous portion. At this time, the continuous portion is closely arranged by setting the circumferential position of the continuous portion to be the same, and a pneumatic pneumatic device that manufactures a bead core by laminating a plurality of strands formed in this way is used. This can be achieved by a method of manufacturing a bead core for a tire.
【０００６】本願の請求項１に記載の発明においては、
ビード部に埋設されているビードコアの各素線層におけ
る連続部の周方向位置を該素線層内において同一とした
ため、任意のリング部と該リング部に連続している連続
部との合計長は１周長と等しくなり、この結果、１枚の
素線層内における素線の巻取り数が増加してビード耐久
性が向上するのである。しかも、各素線層における連続
部は互いに密着配置されているため、隣接する連続部間
には空隙は存在せず、この結果、ビードコアがタイヤ走
行時に大きな外力を受けても、連続部近傍の素線が変形
したりずれたりすることは殆どなく、これにより、ビー
ドコアの形状が安定しビード耐久性がさらに向上するの
である。そして、このような空気入りタイヤに用いられ
るビードコアは請求項６に記載の方法によって簡単、確
実に製造することができる。[0006] In the invention described in claim 1 of the present application,
Since the circumferential position of the continuous portion in each wire layer of the bead core buried in the bead portion is the same in the wire layer, the total length of any ring portion and the continuous portion continuous to the ring portion Is equal to one circumference, and as a result, the number of windings of the wire in one wire layer is increased, and the bead durability is improved. In addition, since the continuous portions of the individual wire layers are arranged in close contact with each other, there is no gap between adjacent continuous portions. As a result, even when the bead core receives a large external force during tire running, the vicinity of the continuous portions The wire is hardly deformed or displaced, whereby the shape of the bead core is stabilized and the bead durability is further improved. The bead core used in such a pneumatic tire can be simply and reliably manufactured by the method according to the sixth aspect.
【０００７】また、請求項２に記載のように構成すれ
ば、巻回時の接着力が高くなって素線の位置決め精度が
向上するとともに、加圧、加熱によって空隙に流れ込ん
だゴムによりスチール線（裸線）同士を固着することが
できる。さらに、請求項３に記載のように構成すれば、
前述の効果をより顕著なものとすることができる。ま
た、請求項４に記載のように構成すれば、スチール素線
間に空隙が発生する事態を阻止しながらこれらスチール
素線を最密構造とすることができる。さらに、請求項５
に記載のように構成すれば、スチール素線間に空隙が発
生する事態を阻止しながらビードコアの形状をより安定
とすることができる。According to the second aspect of the present invention, the adhesive force at the time of winding is increased and the positioning accuracy of the wire is improved, and the steel wire is formed by the rubber flowing into the gap by pressurization and heating. (Bare wires) can be fixed to each other. Further, if configured as described in claim 3,
The above effect can be made more remarkable. Further, according to the structure of the fourth aspect, it is possible to form the steel wires in a close-packed structure while preventing the occurrence of a gap between the steel wires. Further, claim 5
With such a configuration, it is possible to make the shape of the bead core more stable while preventing a situation in which a gap is generated between the steel wires.
【０００８】[0008]
【発明の実施の形態】以下、この発明の一実施形態を図
面に基づいて説明する。図１において、21はトラック、
バス等に装着される重荷重用の空気入りラジアルタイヤ
であり、このタイヤ21は一対のビード部23と、これらビ
ード部23から略半径方向外側に向かってそれぞれ延びる
サイドウォール部24と、これらサイドウォール部24の半
径方向外端同士を連ねる略円筒状のトレッド部25とを備
えている。そして、この空気入りタイヤ21は前記ビード
部23にそれぞれ埋設されたビードコア27間をトロイダル
状に延びてサイドウォール部24、トレッド部25を補強す
るカーカス層28を有し、このカーカス層28の両端部はス
ティフナー29が付着されたビードコア27の回りに軸方向
内側から軸方向外側に向かって折り返されている。前記
カーカス層28は少なくとも１枚、ここでは１枚のカーカ
スプライ30から構成され、このカーカスプライ30の内部
にはラジアル方向（子午線方向）に延びる非伸張性のコ
ードが多数本埋設されている。また、前記ビード部23に
おけるカーカス層28の外側にはワイヤーチェーファー31
がそれぞれ重ね合わされている。34はカーカス層28の半
径方向外側に配置されたベルト層であり、このベルト層
34は少なくとも２枚（ここでは３枚）のベルトプライ35
を積層することで構成され、各ベルトプライ35の内部に
は非伸張性コードが埋設されている。ここで、前記ベル
トプライ35に埋設されているコードはタイヤ赤道面Ｓに
対して所定の角度で交差するとともに、少なくとも２枚
のベルトプライ35間において交差している。36は前記カ
ーカス層28の半径方向外側、詳しくはベルト層34の半径
方向外側に配置されたトレッドゴムであり、このトレッ
ドゴム36の外表面には周方向に延びる複数本の主溝37
と、これら主溝37に交差する複数本の横溝（図示してい
ない）とが形成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 21 is a truck,
The tire 21 is a pneumatic radial tire for heavy loads mounted on a bus or the like. The tire 21 has a pair of bead portions 23, sidewall portions 24 extending substantially radially outward from the bead portions 23, and these sidewalls. And a substantially cylindrical tread portion 25 connecting the radially outer ends of the portion 24 to each other. The pneumatic tire 21 has a carcass layer 28 extending in a toroidal shape between bead cores 27 buried in the bead portions 23 and reinforcing the sidewall portions 24 and the tread portion 25. The portion is folded back from the inside in the axial direction to the outside in the axial direction around the bead core 27 to which the stiffener 29 is attached. The carcass layer 28 is composed of at least one carcass ply 30, here one carcass ply 30. Inside the carcass ply 30, a large number of non-extendable cords extending in the radial direction (meridian direction) are embedded. A wire chafer 31 is provided outside the carcass layer 28 in the bead portion 23.
Are superimposed on each other. Reference numeral 34 denotes a belt layer disposed radially outside of the carcass layer 28.
34 is at least two (here, three) belt plies 35
Are laminated, and a non-extensible cord is embedded inside each belt ply 35. Here, the cord embedded in the belt ply 35 intersects the tire equatorial plane S at a predetermined angle and intersects between at least two belt plies 35. Reference numeral 36 denotes a tread rubber disposed radially outside the carcass layer 28, more specifically, radially outside the belt layer 34.A plurality of circumferentially extending main grooves 37 are provided on the outer surface of the tread rubber 36.
And a plurality of lateral grooves (not shown) intersecting these main grooves 37.
【０００９】図２、３、４において、前記ビードコア27
は断面が六角形でリング状を呈し、半径方向に重ね合わ
された複数層、ここでは５層の素線層39から構成されて
いる。各素線層39は非伸張性の素線40から構成され複数
のリング状をしたリング部41を有し、この実施形態にお
いては半径方向最内側の素線層39に５本のリング部41
が、また、最内側から２番目の素線層39に６本、同３番
目の素線層39に７本、同４番目の素線層39に６本、同５
番目の素線層39に５本のリング部41がそれぞれ配置され
ている。これらのリング部41はビードコア27の周方向に
実質上平行で、ほぼ１周、詳しくは１周より後述する連
続部の長さＬを減じた長さに亘って延びるとともに、互
いに同軸関係を保った状態で側端同士が密着配置されて
いる。また、任意の隣接する２つのリング部41のうち一
方のリング部41の周方向終端42と他方のリング部41の周
方向始端43との間には、ビードコア27の周方向に対して
所定の小さな角度で傾斜しながら延びる連続部44が配置
され、該連続部44は前述と同一の素線40から構成される
とともに、隣接する両リング部41同士を連続させる。こ
こで、リング部41は前述のように複数あるため、連続部
44もこれに対応して複数存在する。Referring to FIGS. 2, 3, and 4, the bead core 27
Has a hexagonal cross section and a ring shape, and is composed of a plurality of element layers 39 superposed in the radial direction, here, five element layers. Each of the strand layers 39 has a plurality of ring-shaped ring portions 41 composed of non-stretchable strands 40. In this embodiment, five ring portions 41 are provided on the radially innermost strand layer 39.
However, there are also six wires in the second wire layer 39, seven wires in the third wire layer 39, six wires in the fourth wire layer 39, and five wires in the fourth wire layer 39 from the innermost side.
Five ring portions 41 are arranged on the third strand layer 39, respectively. These ring portions 41 are substantially parallel to the circumferential direction of the bead core 27, extend over substantially one round, more specifically, over a length obtained by subtracting the length L of a continuous portion described later from one round, and maintain a coaxial relationship with each other. The side ends are placed in close contact with each other. In addition, between the circumferential end 42 of one of the ring portions 41 and the circumferential start end 43 of the other ring portion 41 of any two adjacent ring portions 41, a predetermined distance with respect to the circumferential direction of the bead core 27. A continuous portion 44 that extends while being inclined at a small angle is arranged. The continuous portion 44 is formed of the same strand 40 as described above, and connects the adjacent ring portions 41 to each other. Here, since there are a plurality of ring portions 41 as described above,
There are also 44 corresponding to this.
【００１０】そして、これら連続部44の周方向位置は該
連続部44が存在する素線層39内において同一となってお
り、この結果、同一の素線層39内における連続部44は側
端同士が互いに密着した状態で配置されている。これに
より、任意のリング部41と該リング部41に連続している
連続部44との周方向合計長は１周長と等しくなり、この
結果、１枚の素線層39内における素線40の巻取り数が増
加してビード耐久性が向上するのである。また、前述の
ように各素線層39における連続部44は互いに密着配置さ
れているため、隣接する連続部44間には空隙は存在せ
ず、この結果、ビードコア27がタイヤ21の走行時に大き
な外力を受けても、連続部44近傍の素線40が変形したり
ずれたりすることは殆どなく、これにより、ビードコア
27の形状が安定しビード耐久性が向上するのである。な
お、前述した連続部44の周方向位置は、素線層39毎に異
ならせ、例えば周方向に等距離離すようにすることが、
素線40の本数が少ない箇所（連続部44）を周方向に分散
させる意味から好ましい。The circumferential positions of the continuous portions 44 are the same in the wire layer 39 in which the continuous portions 44 exist. As a result, the continuous portions 44 in the same wire layer 39 They are arranged in close contact with each other. As a result, the total circumferential length of the arbitrary ring portion 41 and the continuous portion 44 continuous with the ring portion 41 becomes equal to one circumferential length. As a result, the wire 40 in one wire layer 39 is formed. And the bead durability is improved. Further, as described above, since the continuous portions 44 in each of the strand layers 39 are arranged in close contact with each other, there is no gap between the adjacent continuous portions 44, and as a result, the bead core 27 is large when the tire 21 runs. Even if an external force is applied, the wire 40 near the continuous portion 44 hardly deforms or shifts.
The shape of 27 is stable, and the bead durability is improved. Incidentally, the circumferential position of the continuous portion 44 described above is different for each strand layer 39, for example, may be separated by an equal distance in the circumferential direction,
This is preferable from the viewpoint of dispersing a portion (continuous portion 44) having a small number of strands 40 in the circumferential direction.
【００１１】また、前記素線40は単線または撚り線から
なる断面円形のスチール線47と該スチール線47の周囲を
被覆するゴム層48とから構成されている。ここで、前述
のようにスチール線47をゴム層48で被覆することで素線
40を構成すると、巻回時の接着力が高くなって素線40の
位置決め精度が向上するとともに、加圧、加熱によって
空隙に流れ込んだゴムによりスチール線（裸線）47同士
を固着することができる。そして、前述のスチール素線
47は前述のような重荷重用空気入りタイヤ11の場合には
直径ｄが1.83mm以上とかなり太径のものを用いる。ここ
で、このようにスチール素線47の直径が大きいと、従来
においては連続部間に広い空隙が形成されていたが、こ
の実施形態ではこのような広い空隙を無くすことができ
るため、前述の効果をより顕著なものとすることができ
る。また、前記ゴム層48の厚さｔは、スチール線47の直
径をｄmmとしたとき、 0.02505ｄから 0.10625ｄまでの
範囲とすることが好ましい。その理由は、厚さｔが 0.0
2505ｄ未満であると、素線40間、詳しくは互いに接触し
ている３本の素線40間に形成される三角形状の空間がゴ
ムで埋まらず、空隙が発生してしまうからであり、一
方、厚さｔが 0.10625ｄを超えると、素線40間の間隔が
広くなりすぎて素線層39が最密構造でなくなってしまう
からである。さらに、前記ゴム層48の厚さｔは、 0.030
65ｄから 0.07905ｄまでの範囲とすることがさらに好ま
しい。その理由は、厚さｔが 0.03065ｄ未満であると、
長時間使用したとき、ゴムの剥離が発生することがある
からであり、一方、厚さｔが 0.07905ｄを超えると、変
形が容易なゴムの占有体積が増大して素線40が変形、移
動し易くなり、ビードコア27の形状安定性が低下するか
らである。また、前記連続部44の周方向長さＬは、スチ
ール線47の直径をｄmmとしたとき、21ｄ2 から42ｄ2 ま
での範囲内とすることが好ましい。その理由は、周方向
長さＬが21ｄ2 未満であると、リング部41と連続部44と
の境界において折り曲げられた素線40が初期の直線状態
に復元しようとして素線層39内でずれ、素線40間に間隙
が発生することがあるからであり、一方、周方向長さＬ
が42ｄ2 を超えると、連続部44における素線40が素線層
39間で最密状態でなくなるため、該素線層39間で滑りが
発生し、ビードコア27の形状安定性が低下することがあ
るからである。The element wire 40 is composed of a steel wire 47 having a circular cross section made of a single wire or a stranded wire, and a rubber layer 48 covering the periphery of the steel wire 47. Here, as described above, the steel wire 47 is covered with the rubber
When 40 is configured, the adhesive force at the time of winding is increased and the positioning accuracy of the strand 40 is improved, and the steel wires (bare wires) 47 are fixed to each other by the rubber that has flowed into the gap due to pressurization and heating. it can. And the aforementioned steel strand
For the heavy duty pneumatic tire 11 as described above, a tire 47 having a considerably large diameter of 1.83 mm or more is used. Here, if the diameter of the steel strand 47 is large as described above, a wide gap is formed between the continuous portions in the related art, but in the present embodiment, such a wide gap can be eliminated. The effect can be more pronounced. The thickness t of the rubber layer 48 is preferably in the range of 0.02505d to 0.10625d, where the diameter of the steel wire 47 is dmm. The reason is that the thickness t is 0.0
If it is less than 2505d, the triangular space formed between the wires 40, more specifically, between the three wires 40 that are in contact with each other, will not be filled with rubber, and voids will be generated. If the thickness t exceeds 0.10625d, the interval between the strands 40 becomes too wide, and the strand layer 39 is not a dense structure. Further, the thickness t of the rubber layer 48 is 0.030
More preferably, the range is from 65d to 0.07905d. The reason is that if the thickness t is less than 0.03065d,
When used for a long time, the rubber may be peeled off. On the other hand, when the thickness t exceeds 0.07905d, the volume occupied by the easily deformable rubber increases, and the wire 40 deforms and moves. This is because the shape stability of the bead core 27 is reduced. Further, the circumferential length L of the continuous portion 44 is preferably in the range of 21 d 2 to 42 d 2 , where the diameter of the steel wire 47 is d mm. The reason is that if the circumferential length L is less than 21 d 2 , the wire 40 bent at the boundary between the ring portion 41 and the continuous portion 44 shifts in the wire layer 39 to restore the initial linear state. This is because a gap may be generated between the wires 40, while the circumferential length L
Exceeds 42d 2 , the wire 40 in the continuous portion 44 becomes a wire layer
The reason for this is that the close proximity between the wire layers 39 causes the slip between the wire layers 39 to occur, which may lower the shape stability of the bead core 27.
【００１２】そして、前述のようなビードコア27を製造
する場合には、図５に示すような全体としてリング状を
呈するとともに、傾斜した外周に断面が六角形を２分割
した台形状の環状溝51が形成された成形リング52を準備
するが、このような成形リング52は周方向に並べて設置
され半径方向に同期移動可能な複数の弧状セグメント53
から構成されている。次に、このような成形リング52を
軸線回りに回転させながら前記環状溝51に素線40を供給
し、該素線40を環状溝51の底面51ａ、斜面51ｂの境界近
傍に押付けながらほぼ１周に亘って、詳しくは１周から
連続部44の周方向長さＬを減じた長さだけ巻回する。こ
れにより、環状溝51内には周方向に実質上平行で周方向
長さが１周長に近いリング状のリング部41が形成され
る。このようにしてリング部41が周方向始端43まで形成
されると、前記素線40の供給位置を他側の斜面51ｃに向
かって徐々にずらし、素線40を周方向に対して傾斜させ
ながら前記リング部41の周方向始端43の側面に密着する
までさらに環状溝51内において巻回し、連続部44を形成
する。このようにして連続部44が形成されると、素線40
の供給位置を当該位置において停止させる。そして、こ
のような作業を繰り返し行うことで、環状溝51の底面51
ａの周囲に複数のリング部41を互いに同軸関係を保って
密着配置させるとともに、隣接する２つのリング部41の
周方向終端42と周方向始端43とを連続部44で連続させて
最内側の素線層39を形成するが、この際、前記連続部44
の周方向位置が同一となるよう素線40の供給位置を制御
し、連続部44が密着配置されるようにする。このように
して最内側の素線層39を成形するが、このような作業を
繰り返し行って複数層の素線層39を半径方向外側に次々
と積層し、ビードコア27を製造する。In the case of manufacturing the above-described bead core 27, a trapezoidal annular groove 51 having a ring shape as a whole as shown in FIG. A molding ring 52 is prepared, in which a plurality of arc-shaped segments 53 are installed side by side in the circumferential direction and can be moved synchronously in the radial direction.
It is composed of Next, the element wire 40 is supplied to the annular groove 51 while rotating such a forming ring 52 around the axis, and the element wire 40 is pressed almost against the boundary between the bottom surface 51 a and the slope 51 b of the annular groove 51 while being pressed near the boundary. In detail, the winding is performed by a length obtained by subtracting the circumferential length L of the continuous portion 44 from one round. Thus, a ring-shaped ring portion 41 substantially parallel to the circumferential direction and having a circumferential length close to one circumferential length is formed in the annular groove 51. When the ring portion 41 is formed up to the circumferential start end 43 in this way, the supply position of the wire 40 is gradually shifted toward the slope 51c on the other side, and the wire 40 is inclined with respect to the circumferential direction. The ring portion 41 is further wound in the annular groove 51 until it comes into close contact with the side surface of the circumferential start end 43 of the ring portion 41 to form a continuous portion 44. When the continuous portion 44 is formed in this manner, the wire 40
Is stopped at that position. By repeatedly performing such operations, the bottom surface 51 of the annular groove 51 is formed.
A plurality of ring portions 41 are closely arranged while maintaining a coaxial relationship with each other around a, and a circumferential end 42 and a circumferential start end 43 of two adjacent ring portions 41 are continuous with a continuous portion 44 to form an innermost portion. The wire layer 39 is formed, and at this time, the continuous portion 44 is formed.
The supply position of the element wire 40 is controlled so that the circumferential position of the continuous wire becomes the same, so that the continuous portion 44 is closely arranged. The innermost wire layer 39 is formed in this manner, and such operations are repeated to laminate the plurality of wire layers 39 one after another in the radial direction to manufacture the bead core 27.
【００１３】[0013]
【発明の効果】以上説明したように、この発明によれ
ば、空気入りタイヤのビードコアにおける素線巻取り数
の増大および形状崩れの防止を図ることができる。As described above, according to the present invention, it is possible to increase the number of windings of a wire in a bead core of a pneumatic tire and to prevent shape collapse.
【図１】この発明の一実施形態を示す空気入りタイヤの
子午線断面図である。FIG. 1 is a meridian sectional view of a pneumatic tire according to an embodiment of the present invention.
【図２】ビードコアの断面図である。FIG. 2 is a sectional view of a bead core.
【図３】図２のＩーＩ矢視図である。FIG. 3 is a view taken in the direction of arrows II in FIG. 2;
【図４】素線の断面図である。FIG. 4 is a sectional view of a strand.
【図５】素線の巻回状態を説明する断面図である。FIG. 5 is a cross-sectional view illustrating a winding state of a wire.
【図６】従来のビードコアの一例を示す子午線断面図で
ある。FIG. 6 is a meridional sectional view showing an example of a conventional bead core.
【図７】図６のIIーII矢視図である。7 is a view taken in the direction of arrows II-II in FIG. 6;
21…空気入りタイヤ 23…ビード部 27…ビードコア 39…素線層 40…素線 41…リング部 42…周方向終端 43…周方向始端 44…連続部 47…スチール線 48…ゴム層 21 ... pneumatic tire 23 ... bead part 27 ... bead core 39 ... strand layer 40 ... strand 41 ... ring part 42 ... circumferential end 43 ... circumferential start 44 ... continuous part 47 ... steel wire 48 ... rubber layer
Claims (6)
質上平行でほぼ１周に亘ってリング状に延びるととも
に、互いに同軸関係を保って密着配置された複数のリン
グ部と、前記素線と同一の素線から構成され、隣接する
２つのリング部のうち一方のリング部の周方向終端から
他方のリング部の周方向始端まで周方向に対して傾斜し
ながら延びることで両リング部を連続させる複数の連続
部とからなる素線層を、複数層積層することで構成した
ビードコアをビード部に有する空気入りタイヤにおい
て、各素線層における連続部の周方向位置を該素線層内
において同一とすることで該連続部を密着配置するよう
にしたことを特徴とする空気入りタイヤ。1. A plurality of ring portions which are made of non-stretchable wires, extend substantially in a ring substantially substantially in the circumferential direction, and extend in a ring shape over substantially one circumference, and are coaxially and closely arranged with each other; The two strands are formed of the same strand as the strand, and extend from the circumferential end of one of the two adjacent ring portions to the circumferential start of the other ring portion while being inclined with respect to the circumferential direction. In a pneumatic tire having a bead core having a bead core formed by laminating a plurality of strands made up of a plurality of continuous parts that make a ring part continuous, the circumferential position of the continuous part in each strand is determined by the element. The pneumatic tire, wherein the continuous portion is arranged in close contact by making the same in the wire layer.
囲を被覆するゴム層とから構成した請求項１記載の空気
入りタイヤ。2. The pneumatic tire according to claim 1, wherein said element wire comprises a steel wire and a rubber layer covering the periphery of said steel wire.
る請求項２記載の空気入りタイヤ。3. The pneumatic tire according to claim 2, wherein the steel wire has a diameter d of 1.83 mm or more.
ム層の厚さｔを 0.02505ｄから 0.10625ｄまでの範囲と
した請求項２記載の空気入りタイヤ。4. The pneumatic tire according to claim 2, wherein the thickness t of the rubber layer ranges from 0.02505d to 0.10625d, where d is the diameter of the steel wire.
続部の周方向長さＬを21ｄ2 から42ｄ2 までの範囲とし
た請求項２記載の空気入りタイヤ。5. The pneumatic tire according to claim 2, wherein, when the diameter of the steel wire is d, the circumferential length L of the continuous portion is in the range of 21 d 2 to 42 d 2 .
ぼ１周に亘って巻回することでリング状をしたリング部
を形成した後、前記素線を周方向に対して傾斜させなが
ら前記リング部の周方向始端の側面に密着するまでさら
に巻回して連続部を形成する作業を繰り返し行うことに
より、複数のリング部が互いに同軸関係を保って密着配
置されるとともに、隣接する２つのリング部のうち一方
のリング部の周方向終端と他方のリング部の周方向始端
とが連続部で連続された素線層を形成する際、前記連続
部の周方向位置を同一とすることで該連続部を密着配置
するとともに、このようにして形成された素線層を複数
層積層することでビードコアを製造するようにしたこと
を特徴とする空気入りタイヤ用ビードコアの製造方法。6. A ring-shaped ring portion is formed by winding a non-stretchable wire substantially in parallel with the circumferential direction over substantially one round, and then winding the wire with respect to the circumferential direction. By repeating the operation of further winding and forming a continuous portion until the ring portion is closely contacted with the side surface of the circumferential start end of the ring portion while inclining, the plurality of ring portions are closely arranged while maintaining a coaxial relationship with each other, and When forming a wire layer in which the circumferential end of one ring portion and the circumferential start end of the other ring portion of the two ring portions are connected by a continuous portion, the circumferential position of the continuous portion is the same. A method for producing a bead core for a pneumatic tire, characterized in that the continuous portion is arranged in close contact with each other to form a bead core by laminating a plurality of strands thus formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36181197A JP4073068B2 (en) | 1997-12-10 | 1997-12-10 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36181197A JP4073068B2 (en) | 1997-12-10 | 1997-12-10 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11170822A true JPH11170822A (en) | 1999-06-29 |
| JP4073068B2 JP4073068B2 (en) | 2008-04-09 |
Family
ID=18474944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36181197A Expired - Lifetime JP4073068B2 (en) | 1997-12-10 | 1997-12-10 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4073068B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001043957A1 (en) * | 1999-12-15 | 2001-06-21 | Pirelli Pneumatici S.P.A. | A method for manufacturing reinforcing annular elements for vehicle tyres, and a tyre incorporating inextensible annular inserts manufactured by such a method |
| JP2013078902A (en) * | 2011-10-04 | 2013-05-02 | Sumitomo Rubber Ind Ltd | Method of manufacturing bead core and method of manufacturing pneumatic tire |
| CN104220187A (en) * | 2012-04-11 | 2014-12-17 | 不二精工株式会社 | Bead-ring winder |
| JP2015516911A (en) * | 2012-04-05 | 2015-06-18 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | Tires and extended mobility wheels-tire assemblies |
| JP2016216044A (en) * | 2011-12-15 | 2016-12-22 | 住友ゴム工業株式会社 | Pneumatic tire |
-
1997
- 1997-12-10 JP JP36181197A patent/JP4073068B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001043957A1 (en) * | 1999-12-15 | 2001-06-21 | Pirelli Pneumatici S.P.A. | A method for manufacturing reinforcing annular elements for vehicle tyres, and a tyre incorporating inextensible annular inserts manufactured by such a method |
| JP2013078902A (en) * | 2011-10-04 | 2013-05-02 | Sumitomo Rubber Ind Ltd | Method of manufacturing bead core and method of manufacturing pneumatic tire |
| JP2016216044A (en) * | 2011-12-15 | 2016-12-22 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP2015516911A (en) * | 2012-04-05 | 2015-06-18 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | Tires and extended mobility wheels-tire assemblies |
| CN104220187A (en) * | 2012-04-11 | 2014-12-17 | 不二精工株式会社 | Bead-ring winder |
| US9533461B2 (en) | 2012-04-11 | 2017-01-03 | Fuji Seiko Co., Ltd. | Bead-ring winder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4073068B2 (en) | 2008-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7416007B2 (en) | Tyre for a vehicle wheel | |
| US3356553A (en) | Method of making pneumatic tires | |
| EP2308694B1 (en) | Pneumatic tire | |
| JP4596717B2 (en) | Tire manufacturing method | |
| JPH09263113A (en) | 15× taper radial tire for truck and bus | |
| JP2005212563A (en) | Pneumatic tire and its manufacturing method | |
| EP1207060B1 (en) | Spiral hex bead and method of manufacture | |
| JP4589684B2 (en) | Manufacturing method of rubber member for tire and pneumatic tire | |
| CN103832215B (en) | Air-inflation tyre and manufacture method thereof | |
| RU2230664C2 (en) | Method of production of tires for transport vehicles and a tire manufactured by the method | |
| JPH11170822A (en) | Manufacture of pneumatic tire and bead core for this pneumatic tire | |
| JP4807976B2 (en) | Pneumatic tire and manufacturing method thereof | |
| JP2006103397A (en) | Pneumatic tire | |
| JPH071925A (en) | Bead structure of tire for automobile | |
| US6913053B2 (en) | Three ply layer turn-up pneumatic tire | |
| JP2783834B2 (en) | Pneumatic radial tire for high-speed running | |
| JP3735447B2 (en) | Pneumatic tire | |
| JP2013099905A (en) | Method for forming belt reinforcing layer base material and pneumatic tire | |
| JPH0310905A (en) | Pneumatic radial tire | |
| JP2004082767A (en) | Bead core for tire | |
| JPH10217716A (en) | Pneumatic radial tire for passenger car | |
| JP2005306077A (en) | Pneumatic tire method of manufacturing pneumatic tire | |
| EP1704991B1 (en) | Method of manufacturing tire | |
| JP2006117078A (en) | Pneumatic tire | |
| JP2001260246A (en) | Method for molding pneumatic tire and tire molding device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040617 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060119 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20061205 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070123 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20080122 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20080122 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110201 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120201 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120201 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130201 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140201 Year of fee payment: 6 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |