JPH0585111A - Bead core of pneumatic tire - Google Patents
Bead core of pneumatic tireInfo
- Publication number
- JPH0585111A JPH0585111A JP3247436A JP24743691A JPH0585111A JP H0585111 A JPH0585111 A JP H0585111A JP 3247436 A JP3247436 A JP 3247436A JP 24743691 A JP24743691 A JP 24743691A JP H0585111 A JPH0585111 A JP H0585111A
- Authority
- JP
- Japan
- Prior art keywords
- bead core
- bead
- tire
- sectional shape
- circumferential direction
- 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
- 239000011324 bead Substances 0.000 title claims abstract description 95
- 238000004804 winding Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims 1
- 238000004073 vulcanization Methods 0.000 abstract description 8
- 241000254043 Melolonthinae Species 0.000 description 3
- 230000012447 hatching Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000003351 stiffener Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/04—Bead cores
- B60C2015/048—Polygonal cores characterised by the winding sequence
Landscapes
- Tyre Moulding (AREA)
- Tires In General (AREA)
- Wire Processing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は自動車等の車両に用いら
れる空気入りタイヤのビードコアに係り、特に断面形状
が多角形に形成された空気入りタイヤのビードコアに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire bead core used in vehicles such as automobiles, and more particularly to a pneumatic tire bead core having a polygonal cross section.
【０００２】[0002]
【従来の技術】空気入りタイヤのビード部にはリング状
のビードコアが配設されており、このビードコアは、カ
ーカスプライを巻付け固定するとともに、タイヤ本体の
内周の寸法を規定し、ホイールリムとのはめ合いを確保
している。2. Description of the Related Art A bead portion of a pneumatic tire is provided with a ring-shaped bead core. The bead core wraps and fixes a carcass ply and defines the inner circumference of a tire main body, and a wheel rim. Secures a fit.
【０００３】ビードコアは、生ゴムの被覆されたビード
ワイヤがタイヤ幅方向に沿って所定数巻回されたビード
ワイヤ層が順次重ねられることによって六角形断面に形
成されている。このビードコアは、ビードワイヤを所定
の型に巻付けることによって作製されており、図５に示
すように、ビードワイヤ層６２はタイヤ周回り方向（図
５矢印Ａ及びＢ方向）に沿って１巻されたビードワイヤ
列が、タイヤ軸方向（図５矢印Ｒ及びＬ方向）に沿って
複数配設されることによって形成される。ここで、ビー
ドワイヤ６０の各列の終わりと次列の巻き始めと間には
屈曲部６０Ａが形成されており、この屈曲部６０Ａの位
置はビードコア５２周上の同一幅方向（図５矢印Ｒ及び
Ｌ方向）に設定されている。The bead core is formed in a hexagonal cross section by sequentially stacking a bead wire layer in which a bead wire covered with raw rubber is wound a predetermined number of times along the tire width direction. This bead core is produced by winding a bead wire around a predetermined mold, and as shown in FIG. 5, the bead wire layer 62 is wound once along the tire circumferential direction (directions A and B in FIG. 5). A plurality of bead wire rows are formed by being arranged along the tire axial direction (the arrow R and L directions in FIG. 5). Here, a bent portion 60A is formed between the end of each row of the bead wires 60 and the winding start of the next row, and the position of this bent portion 60A is the same width direction on the circumference of the bead core 52 (see arrow R in FIG. (L direction).
【０００４】このようにして形成されたビードコア５２
は、生タイヤの内部に組込みこまれ、モールドの内部で
加硫され、各々のビードワイヤ６０の生ゴムが固着され
る。The bead core 52 thus formed
Is incorporated in a raw tire, vulcanized in a mold, and the raw rubber of each bead wire 60 is fixed.
【０００５】ところで、生タイヤを加硫すると、図６に
示すようにカーカスが矢印Ｃ方向へ引っ張られ、ビード
コア５２に張力が作用する。このため、各屈曲部６０Ａ
に応力が作用して、屈曲部６０Ａ近傍のビードコア５２
の断面形状が変形して当初の断面形状が得られないばか
りか、他の補強材、例えば、ステイフナー６４、チェー
ファー６６、プライ端６８等の配置にも影響を与える。
このため、設計当初予定されていたタイヤ性能が得られ
ないばかりか、走行距離が増すにしたがってビードコア
５２の変形が大きくなるという不具合があった。By the way, when the green tire is vulcanized, the carcass is pulled in the direction of arrow C as shown in FIG. 6, and tension acts on the bead core 52. Therefore, each bent portion 60A
Is applied to the bead core 52 near the bent portion 60A.
In addition to the deformation of the cross-sectional shape of No. 1 to obtain the initial cross-sectional shape, it also affects the arrangement of other reinforcing materials such as the stiffener 64, the chafer 66, and the ply end 68.
For this reason, not only the tire performance originally designed was not obtained, but also the deformation of the bead core 52 increased as the traveling distance increased.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記事実を考
慮し、加硫による断面形状の変化を防止すると共に走行
によっても断面形状が変化しない空気入りタイヤのビー
ドコアを提供することが目的である。SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to provide a bead core for a pneumatic tire which prevents a change in cross-sectional shape due to vulcanization and which does not change even when running. ..
【０００７】[0007]
【課題を解決するための手段】請求項１記載の発明は、
ゴムで被覆されたスチールワイヤーが周方向に複数回巻
回されて多角形断面に形成された空気入りタイヤのビー
ドコアであって、前記スチールワイヤーの次巻側に移る
際の屈曲部が周方向に分散されて配置されたことを特徴
としている。The invention according to claim 1 is
A bead core of a pneumatic tire in which a steel wire coated with rubber is wound a plurality of times in the circumferential direction to form a polygonal cross section, and a bent portion when moving to the next winding side of the steel wire is circumferentially applied. It is characterized by being distributed and arranged.
【０００８】請求項２記載の発明は、前記屈曲部が前記
ビードコアの周方向にほぼ等間隔で配設されたことを特
徴としている。The invention according to claim 2 is characterized in that the bent portions are arranged at substantially equal intervals in the circumferential direction of the bead core.
【０００９】[0009]
【作用】請求項１記載の発明では、生タイヤを加硫した
場合にビードワイヤへ張力が作用しても、ビードワイヤ
の屈曲部が外周方向に沿って分散されているため、張力
作用時に屈曲部が変形しても、屈曲部が一点に集中して
配設されていないため、１つの屈曲部の変形が周囲のビ
ードワイヤへ変形作用を及ぼすことがなく、生タイヤの
加硫後においてもビードコアは変形することなく加硫前
の断面形状が維持される。According to the first aspect of the present invention, even if tension is applied to the bead wire when the green tire is vulcanized, since the bent portion of the bead wire is dispersed along the outer peripheral direction, the bent portion is Even if it is deformed, since the bent parts are not concentrated at one point, the deformation of one bent part does not affect the surrounding bead wire, and the bead core is deformed even after vulcanization of the raw tire. The cross-sectional shape before vulcanization is maintained without performing.
【００１０】また、請求項２記載の発明では、請求項１
記載の発明において、ビードワイヤの屈曲部が周方向に
沿ってほぼ等間隔に配設されているため、屈曲部は前巻
側の屈曲部及び次巻側の屈曲部とは隣接することはな
く、加硫時の張力が外周方向にほぼ均等に作用するた
め、屈曲部の変形時の応力が重なり合って周囲のビード
ワイヤへ変形作用を及ぼすことがない。In the invention according to claim 2, the invention according to claim 1
In the invention described, since the bent portion of the bead wire is arranged at substantially equal intervals along the circumferential direction, the bent portion is not adjacent to the bent portion on the front winding side and the bent portion on the next winding side, Since the tension during vulcanization acts substantially evenly in the outer peripheral direction, the stress at the time of deformation of the bent portion does not overlap and the surrounding bead wire is not deformed.
【００１１】好ましくは、隣接する屈曲部は互いに（３
６０°／スチールワイヤーの巻数）で表されるビードコ
ア軸心からの角度に相当する間隔でビードコアの周方向
に配設される。すなわち、屈曲部は隣接するスチールワ
イヤーの屈曲部とは所定間隔離されてビードコアの周方
向の組織構成が一様にされる。Preferably, the adjacent bent portions are (3
They are arranged in the circumferential direction of the bead core at intervals corresponding to the angle from the axis of the bead core expressed by 60 ° / number of turns of steel wire). That is, the bent portion is separated from the bent portion of the adjacent steel wire for a predetermined period, so that the structure of the bead core in the circumferential direction is made uniform.
【００１２】[0012]
【実施例】本発明の一実施例を図１乃至図４にしたがっ
て説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.
【００１３】図２に示すように、本発明が適用された空
気入りタイヤ１２（タイヤサイズは１１Ｒ２２．５）の
ビード部１２にはリング状のビードコア１０が配設され
ている。ビードコア１０の回りにはカーカスプライ１６
がタイヤ幅方向内側（図２の右側）から外側（図２の左
側）へ向けて折り返され、タイヤ幅方向外側に折返しプ
ライ１６Ａが形成されている。このカーカスプライ１６
のボデープライ１６Ｂと折返しプライ１６Ａとによって
囲まれる略三角形状の区域内にはステイフナー１７が配
設されている。また、ビード部１２には、カーカスプラ
イ１６のビードコア１０側とは反対側にチェイファー１
９が配設されている。As shown in FIG. 2, a ring-shaped bead core 10 is arranged in the bead portion 12 of a pneumatic tire 12 (tire size: 11R22.5) to which the present invention is applied. Carcass ply 16 around the bead core 10
Is folded back from the inner side in the tire width direction (right side in FIG. 2) toward the outer side (left side in FIG. 2), and the folded ply 16A is formed on the outer side in the tire width direction. This carcass ply 16
A stapler 17 is arranged in a substantially triangular area surrounded by the body ply 16B and the folded ply 16A. Further, in the bead portion 12, the chafer 1 is provided on the side opposite to the bead core 10 side of the carcass ply 16.
9 are provided.
【００１４】ビードコア１０は、ビードワイヤ１８が所
定数巻回されて形成され断面形状が６角形とされてお
り、タイヤ軸心側（図２紙面下側）に面した辺２４側の
第１層目のビードワイヤ１８の配列本数は９本とされて
いる。図４に詳細に示すように、辺２４に垂直な方向の
各ビードワイヤ層のビードワイヤ１８の総配列本数は、
それぞれ第１層目から順に９本、１０本、１１本、１２
本、１１本、１０本、９本とされており、ビードコア１
０全体では合計７２本とされている。The bead core 10 is formed by winding the bead wire 18 a predetermined number of times and has a hexagonal cross-section, and the first layer on the side 24 side facing the tire shaft center side (the lower side in FIG. 2). The number of bead wires 18 arranged is 9 in number. As shown in detail in FIG. 4, the total number of bead wires 18 in each bead wire layer in the direction perpendicular to the side 24 is
Nine, ten, eleven, and twelve from the first layer, respectively.
The number of beads is 11, 11, 10 and 9, and the bead core 1
The total of 0 is 72 in total.
【００１５】図３に示すように、このビードワイヤ１８
はスチールワイヤー２０の外周が生ゴム２２によって被
覆された構造となっており、軸線と直交する断面形状が
円形とされている。なお、本実施例では、スチールワイ
ヤー２０の直径ｄがφ１．５５ｍｍとされており、ビー
ドワイヤ１８の外径Ｄがφ１．８ｍｍとされている。As shown in FIG. 3, this bead wire 18
Has a structure in which the outer circumference of the steel wire 20 is covered with raw rubber 22, and the cross-sectional shape orthogonal to the axis is circular. In this embodiment, the diameter d of the steel wire 20 is φ1.55 mm, and the outer diameter D of the bead wire 18 is φ1.8 mm.
【００１６】図１に示すように、ビードワイヤ層（図１
では第１層目が図示されている）はビードワイヤ１８が
タイヤ軸方向（図１矢印Ｌ及びＲ方向）の一方側へ向か
って順次密着した状態で巻かれることにより形成されて
おり、次段のビードワイヤ層（図１では想像線で示され
ている）では、ビードワイヤ１８が前のビードワイヤ層
とは反対側、すなわち、タイヤ軸方向の他方側へ向かっ
て順次密着した状態で巻かれている。As shown in FIG. 1, the bead wire layer (see FIG.
The first layer is shown in the figure), and the bead wire 18 is formed by winding the bead wire 18 toward one side in the tire axial direction (direction of arrows L and R in FIG. 1) in a state of being closely adhered to each other. In the bead wire layer (shown by an imaginary line in FIG. 1), the bead wire 18 is wound in a state in which the bead wire 18 is in close contact with the other side in the tire axial direction, that is, the other side in the tire axial direction.
【００１７】ここで、ビードワイヤ１８は各列がタイヤ
周方向に沿って配設されており、次の列とは屈曲部１８
Ａを介して連結されている。本実施例のビードコア１０
では、屈曲部１８Ａと次の屈曲部１８Ａとは周方向に等
間隔となるように設定されており、屈曲部１８Ａ間の間
隔Ｐは、周方向でのビードコア１０を軸線方向から見た
角度で約５°間隔となるように配設されており（本実施
例では、屈曲部１８Ａがビードコア１０に７１箇所ある
ため、これらを周方向に沿って均等に分散させるため
に、屈曲部１８Ａ間の間隔Ｐをビードコア１０を軸線方
向から見た角度で１周３６０°を７１で割った角度５、
０７°に設定した。）、屈曲部１８Ａは巻方向とは反対
方向へ順次ずらされて配設されている。Here, each row of the bead wire 18 is arranged along the tire circumferential direction, and the bent row 18 is different from the next row.
It is connected through A. Bead core 10 of the present embodiment
Then, the bent portion 18A and the next bent portion 18A are set to have an equal interval in the circumferential direction, and the interval P between the bent portions 18A is an angle when the bead core 10 in the circumferential direction is viewed from the axial direction. The bent portions 18A are arranged at approximately 5 ° intervals (in this embodiment, there are 71 bent portions 18A on the bead core 10, and therefore, in order to evenly distribute these in the circumferential direction, the space between the bent portions 18A is The interval P is the angle at which the bead core 10 is viewed from the axial direction, and 360 degrees of one round is divided by 71 to obtain an angle of 5,
It was set to 07 °. ), The bent portions 18A are arranged so as to be sequentially shifted in the direction opposite to the winding direction.
【００１８】次に、本実施例の作用について説明する。
生の空気入りタイヤ１２を加硫すると、カーカス１０が
図２の矢印Ｃ方向へ引っ張られ、ビードコア１０に張力
が作用する。本実施例のビードコア１０では、ビードワ
イヤ１８の屈曲部１８Ａがビードコア１０の周方向に沿
って均等に分散されているため、ビードコア１０の周方
向に沿った組織構成が一様となっており、張力によって
屈曲部１８Ａに応力が作用しても周上の一部に応力が集
中することはなく、また、屈曲部１８Ａが変形しても隣
接するビードワイヤ１８に変形作用を及ぼすことはな
い。したがって、空気入りタイヤ１２の加硫時にビード
コア１２の断面形状が変形することはなく、当初の断面
形状が維持される。したがって、ステイフナー１７、チ
ェーファー１９、プライ端１６Ａ等の位置がずれること
もなく、設計当初のタイヤ性能を有効に発揮することが
でき、走行によってもビードコア１２の当初の断面形状
はほとんど変化しない。 （実験例）従来技術（図６参照）の空気入りタイヤ（タ
イヤサイズ１１Ｒ２２．５、内圧８．００ｋｇ／ｃ
ｍ2、ビードワイヤ５６の直径＝１．５５ｍｍ、）及び
本実施例（図１参照）の空気入りタイヤ（タイヤサイズ
１１Ｒ２２．５、ビードワイヤ１６の直径（Ｄ）＝１．
５５ｍｍ）に夫々ドラム走行試験（規定荷重の２８０
％、走行距離１５０００ｋｍ）を行ってビードコア変形
量を比較した結果を以下の表１に指数で示す（従来品を
１００として、数字の小さい方を良とする）。Next, the operation of this embodiment will be described.
When the raw pneumatic tire 12 is vulcanized, the carcass 10 is pulled in the direction of arrow C in FIG. 2, and tension is applied to the bead core 10. In the bead core 10 of this embodiment, since the bent portions 18A of the bead wire 18 are evenly distributed along the circumferential direction of the bead core 10, the tissue structure along the circumferential direction of the bead core 10 is uniform, and the tension Therefore, even if stress is applied to the bent portion 18A, the stress is not concentrated on a part of the circumference, and even if the bent portion 18A is deformed, the adjacent bead wire 18 is not deformed. Therefore, the cross-sectional shape of the bead core 12 is not deformed during the vulcanization of the pneumatic tire 12, and the initial cross-sectional shape is maintained. Therefore, the positions of the stiffener 17, the chafer 19, the ply end 16A, and the like are not displaced, the tire performance initially designed can be effectively exhibited, and the initial cross-sectional shape of the bead core 12 hardly changes even during running. (Experimental example) A pneumatic tire of the related art (see FIG. 6) (tire size 11R22.5, internal pressure 8.00 kg / c)
m 2 , the diameter of the bead wire 56 = 1.55 mm, and the pneumatic tire of the present embodiment (see FIG. 1) (tire size 11R22.5, diameter of the bead wire 16 (D) = 1.
55mm) drum running test (280% of specified load)
%, Running distance 15,000 km) and comparing the bead core deformation amounts are shown in Table 1 below as an index (the conventional product is 100 and the smaller the number is the better).
【００１９】[0019]
【表１】 上記実験結果から、本実施例のビードコア１２の変形量
は従来品に比較して１５％少なく、本実施例のビードコ
ア１２が優れていることが明らかとなった。[Table 1] From the above experimental results, the deformation amount of the bead core 12 of this example was 15% smaller than that of the conventional product, and it was revealed that the bead core 12 of this example is superior.
【００２０】なお、本実施例においては、ビードコア１
２の断面形状は六角形とされているが、本発明はこれに
限らず、六角形断面以外の形状のビードコアであっても
よいのは勿論である。In this embodiment, the bead core 1
The cross-sectional shape of 2 is hexagonal, but the present invention is not limited to this, and needless to say, a bead core having a shape other than a hexagonal cross-section may be used.
【００２１】また、屈曲部１８Ａは周方向に等間隔で配
設することが望ましいが、周方向に分散されて配設され
ていればよく、必ずしも等間隔で配設しなくてもよい。Further, it is desirable that the bent portions 18A are arranged at equal intervals in the circumferential direction, but it is sufficient that the bent portions 18A are arranged so as to be dispersed in the circumferential direction, and it is not always necessary to arrange them at equal intervals.
【００２２】[0022]
【発明の効果】本発明の空気入りタイヤのビードコアは
上記構成としたので、加硫による断面形状の変化を防止
すると共に走行によっても断面形状が変化しない優れた
効果を有する。Since the bead core of the pneumatic tire of the present invention has the above-mentioned structure, it has an excellent effect of preventing the cross-sectional shape from changing due to vulcanization and preventing the cross-sectional shape from changing during running.
【図１】本発明の実施例に係るビードコアのビードワイ
ヤー列を半径方向から見た平面図である。FIG. 1 is a plan view of a bead wire row of a bead core according to an embodiment of the present invention as viewed in a radial direction.
【図２】本発明の実施例に係るビードコアが適用された
空気入りタイヤのビード部周辺を示す一部ハッチングを
省略した断面図である。FIG. 2 is a cross-sectional view showing a bead portion and its periphery of a pneumatic tire to which a bead core according to an embodiment of the present invention is applied, with partial hatching omitted.
【図３】本発明の実施例に係るビードコアを構成するビ
ードワイアの断面図である。FIG. 3 is a sectional view of a bead wire forming a bead core according to an embodiment of the present invention.
【図４】本発明の実施例に係るビードコアの拡大断面図
である。FIG. 4 is an enlarged sectional view of a bead core according to an embodiment of the present invention.
【図５】従来の空気入りタイヤのビードコアのビードワ
イヤー列を半径方向から見た平面図である。FIG. 5 is a plan view of a bead wire row of a bead core of a conventional pneumatic tire as viewed from a radial direction.
【図６】従来の空気入りタイヤのビード部周辺を示す一
部ハツチングを省略した断面図である。FIG. 6 is a cross-sectional view showing the periphery of a bead portion of a conventional pneumatic tire with partial hatching omitted.
【符号の説明】 １０ ビードコア １８Ａ 屈曲部 ２０ スチールワイヤー ２２ 生ゴム[Explanation of reference numerals] 10 bead core 18A bent portion 20 steel wire 22 raw rubber
Claims (2)
方向に複数回巻回されて多角形断面に形成された空気入
りタイヤのビードコアであって、 前記スチールワイヤーの次巻側に移る際の屈曲部が周方
向に分散されて配置されたことを特徴とする空気入りタ
イヤのビードコア。1. A bead core of a pneumatic tire, wherein a steel wire covered with rubber is wound a plurality of times in the circumferential direction to form a polygonal cross section, and the bending is performed when the steel wire is moved to the next winding side. A bead core for a pneumatic tire, characterized in that the parts are arranged in a distributed manner in the circumferential direction.
ほぼ等間隔で配設されたことを特徴とする請求項１記載
の空気入りタイヤのビードコア。2. The bead core for a pneumatic tire according to claim 1, wherein the bent portions are arranged at substantially equal intervals in the circumferential direction of the bead core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3247436A JPH0585111A (en) | 1991-09-26 | 1991-09-26 | Bead core of pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3247436A JPH0585111A (en) | 1991-09-26 | 1991-09-26 | Bead core of pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0585111A true JPH0585111A (en) | 1993-04-06 |
Family
ID=17163414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3247436A Pending JPH0585111A (en) | 1991-09-26 | 1991-09-26 | Bead core of pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0585111A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009143277A (en) * | 2007-12-11 | 2009-07-02 | Bridgestone Corp | Pneumatic tire |
| CN102673320A (en) * | 2011-03-10 | 2012-09-19 | 住友橡胶工业株式会社 | Pneumatic tire |
| JP2016203185A (en) * | 2015-04-16 | 2016-12-08 | 住友ゴム工業株式会社 | Bead core molding apparatus and bead core molding method |
| JP2016216044A (en) * | 2011-12-15 | 2016-12-22 | 住友ゴム工業株式会社 | Pneumatic tire |
| CN107719029A (en) * | 2016-12-10 | 2018-02-23 | 赛轮金宇集团股份有限公司 | The all steel tubeless meridian tire and its manufacture method of a kind of high-load performance |
-
1991
- 1991-09-26 JP JP3247436A patent/JPH0585111A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009143277A (en) * | 2007-12-11 | 2009-07-02 | Bridgestone Corp | Pneumatic tire |
| CN102673320A (en) * | 2011-03-10 | 2012-09-19 | 住友橡胶工业株式会社 | Pneumatic tire |
| JP2012188016A (en) * | 2011-03-10 | 2012-10-04 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2016216044A (en) * | 2011-12-15 | 2016-12-22 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP2016203185A (en) * | 2015-04-16 | 2016-12-08 | 住友ゴム工業株式会社 | Bead core molding apparatus and bead core molding method |
| CN107719029A (en) * | 2016-12-10 | 2018-02-23 | 赛轮金宇集团股份有限公司 | The all steel tubeless meridian tire and its manufacture method of a kind of high-load performance |
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