JPH035218A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH035218A JPH035218A JP1137443A JP13744389A JPH035218A JP H035218 A JPH035218 A JP H035218A JP 1137443 A JP1137443 A JP 1137443A JP 13744389 A JP13744389 A JP 13744389A JP H035218 A JPH035218 A JP H035218A
- Authority
- JP
- Japan
- Prior art keywords
- bead core
- bead
- rows
- section
- 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.)
- Pending
Links
- 239000011324 bead Substances 0.000 claims abstract description 70
- 238000004804 winding Methods 0.000 abstract description 5
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 239000004636 vulcanized rubber Substances 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Landscapes
- Tires 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、ビードコアを軽量化しなからビード部の耐リ
ム擦れ性を向上させた空気入りタイヤに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pneumatic tire in which the bead core is lightweight and the rim abrasion resistance of the bead portion is improved.
従来、ビード部に配置されたビードコアは、その断面が
矩形状となっている。第３図に従来の空気入リタイヤの
ビード部の一例の断面を示す。第３図において、ビード
部１には複数のワイヤ素線２からなる断面矩形状のビー
ドコア３がタイヤ周方向に環状に配設されている。４は
ビードベース部、５はビードトウ、６はビードヒール、
８はリム形状を表わす。第４図に第３図のビードコア３
を拡大して示すように、その列数×層数は６×５からな
っている。このビードコア３は、並列に配置した複数本
のワイヤ素線２にゴム７を被覆して板状体となし、この
板状体をタイヤ周方向に環状に順次積層させて形成され
ている。このように、従来のビードコア３においては、
一定本数のワイヤ素線を並べた帯状体を重ね巻きするた
め、ビードコアの断面が矩形状となる。Conventionally, a bead core placed in a bead portion has a rectangular cross section. FIG. 3 shows a cross section of an example of a bead portion of a conventional pneumatic tire. In FIG. 3, a bead core 3 having a rectangular cross section and consisting of a plurality of wire strands 2 is arranged in a ring shape in the tire circumferential direction in the bead portion 1. As shown in FIG. 4 is the bead base, 5 is the bead toe, 6 is the bead heel,
8 represents the rim shape. Figure 4 shows the bead core 3 in Figure 3.
As shown in the enlarged view, the number of columns x the number of layers is 6 x 5. The bead core 3 is formed by coating a plurality of wire strands 2 arranged in parallel with rubber 7 to form a plate-like body, and sequentially stacking the plate-like bodies in an annular manner in the circumferential direction of the tire. In this way, in the conventional bead core 3,
Since the belt-like body in which a certain number of wire strands are arranged is wound in an overlapping manner, the cross section of the bead core becomes rectangular.
ところで、本発明者等の検討によれば、タイヤをリム組
みした場合、ビード部１のリムへの接触力の分布形状が
フラットな方が耐リム擦れ性において有利であるという
知見が得られた。By the way, according to studies conducted by the present inventors, it has been found that when a tire is assembled with a rim, a flat distribution shape of the contact force of the bead portion 1 to the rim is advantageous in terms of rim abrasion resistance. .
このように接触力の分布形状をフラットにするには、ビ
ードベース部４側のビードコア３の最内層のワイヤ素線
２の本数を増加し２、タイヤ軸方向の幅を広げてビード
コア３とリムとの間で圧縮される領域を広げればよい。In order to make the contact force distribution shape flat in this way, the number of wire strands 2 in the innermost layer of the bead core 3 on the side of the bead base portion 4 is increased 2, and the width in the tire axial direction is widened so that the bead core 3 and the rim All you have to do is widen the area compressed between.
しかし、従来のビードコア３においては、断面が矩形状
であるため、最内層の幅を広げると最外層までの全層の
幅を広げなければならなくなり、その結果として、ビー
ドコア３０重量が増加する欠点があると共に、ビードコ
ア３とタイヤ内壁との間隔ａ （第３図参照）が狭くな
り、耐久性の面で好ましくないので、最内層の幅を広げ
るには限度があった。However, since the conventional bead core 3 has a rectangular cross section, increasing the width of the innermost layer requires increasing the width of all layers up to the outermost layer, resulting in an increase in the weight of the bead core 30. At the same time, the distance a (see FIG. 3) between the bead core 3 and the tire inner wall becomes narrower, which is unfavorable in terms of durability, so there is a limit to how much the width of the innermost layer can be increased.
本発明は、１本のワイヤ素線を重ね巻きしてビードコア
を構成することにより、ビードコアを軽量化しなからビ
ード部の耐すム擦れ性を向上さた空気入りタイヤを提供
することを目的とする。An object of the present invention is to provide a pneumatic tire that improves the abrasion resistance of the bead portion while reducing the weight of the bead core by constituting the bead core by overlapping one wire strand. do.
本発明の空気入りタイヤは、１本のワイヤ素線をタイヤ
周方向に環状に複数列にエンドレスに巻回して層を形成
させ、このようにしてビードベース部側の最内層からト
レッド部側の最外層に向けて複数層を積層させると共に
、最外層の列数が最内層の列数より少ない断面台形状に
形成したビードコアをビード部に有することを特徴とす
る。In the pneumatic tire of the present invention, layers are formed by endlessly winding a single wire wire in multiple rows in an annular manner in the tire circumferential direction, and in this way, layers are formed from the innermost layer on the bead base side to the tread side. It is characterized in that a plurality of layers are laminated toward the outermost layer, and the bead portion has a bead core formed in a trapezoidal cross section in which the number of rows in the outermost layer is smaller than the number of rows in the innermost layer.
以下、図を参照してこの手段につき詳しく説明する。な
お、第３図および第４図におけると同じ部位又は部品は
、同じ番号で示す。This means will be explained in detail below with reference to the drawings. Note that the same parts or parts as in FIGS. 3 and 4 are indicated by the same numbers.
本発明においては、第１図に示すように、ビードコア３
は断面台形状になっている。このビードコア３は、未加
硫のゴム７が被覆された一木のワイヤ素線２をタイヤ周
方向に環状に複数列にエンドレスに巻回しながら複数層
を順次積層させることにより作製される。このようにワ
イヤ素線２をエンドレスに巻回するとき、まず、ビード
ベース側の最内層を形成させ、この最内層の上に列数を
同一もしくは１〜数本ずつ滅じて同様な層を形成させる
。この手順を最外層まで順序的に行う。このように、ビ
ードベース側の最内層からｉ・レッド部側の最外層に行
くにつれて肩の列数を同一もしくは徐々に減少させるた
め、出来上ったビードコアは断面台形状となる。なお、
ワイヤ素線２にコートされた未加硫のゴム７は、タイヤ
の加硫中に加硫される。In the present invention, as shown in FIG.
has a trapezoidal cross section. The bead core 3 is produced by sequentially laminating a plurality of layers while endlessly winding a single piece of wire 2 coated with unvulcanized rubber 7 in a plurality of rows in a circular shape in the tire circumferential direction. When winding the wire strand 2 endlessly in this way, first, the innermost layer on the bead base side is formed, and then a similar layer is formed on this innermost layer with the same number of rows or with one or several rows removed. Let it form. This procedure is carried out sequentially up to the outermost layer. In this way, the number of shoulder rows is the same or gradually decreases from the innermost layer on the bead base side to the outermost layer on the i/red portion side, so the finished bead core has a trapezoidal cross section. In addition,
The unvulcanized rubber 7 coated on the wire strand 2 is vulcanized during tire vulcanization.
本発明では、このように１本のワイヤ素線２でビードコ
ア３を構成するために、最内層から最外層へと複数層を
積層させるに際して積層形状の自由度を大きくすること
ができる。すなわち、層毎の列数を任意に変更できる。In the present invention, since the bead core 3 is constituted by one wire strand 2 in this way, the degree of freedom in the laminated shape can be increased when laminating a plurality of layers from the innermost layer to the outermost layer. That is, the number of columns in each layer can be changed arbitrarily.
このためビードコア３の断面を任意の台形状とするのが
容易であり、これによって、ビードコア３の最内層のタ
イヤ軸方向の幅を広げてビード部１のリムへの接触力の
分布形状をフラットにすることができると共に、最内層
で最も大きく最外層に行くにつれて徐々に小さくなると
いうビードコア張力の分担率に応じて層の列数を減する
ことができ、ビードコア３の軽量化をはかることができ
る。For this reason, it is easy to make the cross section of the bead core 3 into an arbitrary trapezoidal shape, thereby increasing the width of the innermost layer of the bead core 3 in the tire axial direction and flattening the distribution shape of the contact force of the bead portion 1 to the rim. In addition, the number of rows of layers can be reduced in accordance with the share of the bead core tension, which is largest in the innermost layer and gradually decreases toward the outermost layer, and the weight of the bead core 3 can be reduced. can.
また、同じ列数の層を比較した場合、複数本のワイヤ素
線２を並列に配置して巻く場合に比して１本のワイヤ素
線２をエンドレスに並べるように巻回した方が層の強度
を大幅に向上させることができる。したがって、本発明
におけるビードコア３では第４図に示す従来の断面矩形
状のビードコア３に比して、強度を殆ど低下させること
なくワイヤ素線長を節約することができる。Also, when comparing layers with the same number of rows, it is better to wind one wire strand 2 in an endless array than to wind multiple wire strands 2 in parallel. can significantly improve the strength of Therefore, in the bead core 3 according to the present invention, compared to the conventional bead core 3 having a rectangular cross section shown in FIG. 4, the length of wire strands can be saved without almost reducing the strength.
ワイヤ素線２としては、通常のビードコア用の硬鋼線を
用いることができるが、特に、高張力鋼コード（ＨＴＣ
）を用いるのが好ましい。As the wire wire 2, a normal hard steel wire for bead cores can be used, but in particular, high-tensile steel cord (HTC
) is preferably used.
高張力鋼コードを用いると、線径を小さくできるからビ
ードコア３の軽量化およびワイヤ素線長の節約をいっそ
うはかることが可能となる。When a high-strength steel cord is used, the wire diameter can be reduced, making it possible to further reduce the weight of the bead core 3 and the length of the wire strands.
さらに、本発明においては、第２図に示すように、ビー
ドコア３の断面においてビードトウ側の側面と最内層の
底面とのなす角度αをビードヒール側の側面と最内層の
底面とのなす角度βよりも小さくするのが好ましい（α
くβ）。Furthermore, in the present invention, as shown in FIG. 2, in the cross section of the bead core 3, the angle α between the side surface on the bead toe side and the bottom surface of the innermost layer is smaller than the angle β between the side surface on the bead heel side and the bottom surface of the innermost layer. It is also preferable to make it small (α
kuβ).
これは、ビード部の形状との関係で、ビードコ４゜
ア３の外周とタイヤ壁との間隔（例えば、第３図に示す
間隔ａ）を一定収上に保持し、軽量でありながら強度的
に満足しうるビードコアを確保するための配慮であり、
これによりビード部１のリムへの接触圧を保持すること
ができる。In relation to the shape of the bead part, this maintains a constant distance between the outer periphery of the bead core 4° and the tire wall (for example, the distance a shown in Figure 3), making it lightweight yet strong. This is a consideration to ensure a bead core that satisfies the
Thereby, the contact pressure of the bead portion 1 to the rim can be maintained.
以上説明したように本発明によれば、１本のワイヤ素線
をエンドレスに巻き重ねることによって断面台形状のビ
ードコアを構成したために、ビード部の耐すム擦れ性を
向上させると共にビードコアを軽量化させることができ
、さらに強度を殆ど低下させることなくワイヤ素線長を
節約することが可能となる。As explained above, according to the present invention, a bead core having a trapezoidal cross section is constructed by endlessly winding one wire strand, thereby improving the abrasion resistance of the bead portion and reducing the weight of the bead core. Furthermore, it becomes possible to save the length of the wire strands without substantially reducing the strength.
第１図および第２図はそれぞれ本発明におけるビードコ
アの断面の一例を示す説明図、第３図は従来の空気入り
タイヤのビード部の一例のタイヤ子午線方向断面を示す
説明図、第４図は第３図におけるビードコアを拡大して
示す断面説明図である。
１・・・ビード部、２・・・ワイヤ素線、３・・・ビー
ドコア、４・・・ビードベース部、５・・・ビードトウ
、６・・・ビードヒール、７・・・ゴム。1 and 2 are explanatory diagrams showing an example of a cross section of a bead core in the present invention, respectively. FIG. 3 is an explanatory diagram showing a tire meridian direction cross section of an example of a bead portion of a conventional pneumatic tire. FIG. 4 is an explanatory cross-sectional view showing an enlarged view of the bead core in FIG. 3; DESCRIPTION OF SYMBOLS 1... Bead part, 2... Wire strand, 3... Bead core, 4... Bead base part, 5... Bead toe, 6... Bead heel, 7... Rubber.
Claims (1)
ドレスに巻回して層を形成させ、このようにしてビード
ベース部側の最内層からトレッド部側の最外層に向けて
複数層を積層させると共に、最外層の列数が最内層の列
数より少ない断面台形状に形成したビードコアをビード
部に有する空気入りタイヤ。A single strand of wire is wound endlessly in multiple rows in the circumferential direction of the tire to form layers, and in this way multiple layers are formed from the innermost layer on the bead base side to the outermost layer on the tread side. A pneumatic tire having a bead core in a bead portion that is laminated and has a trapezoidal cross section in which the number of rows in the outermost layer is smaller than the number of rows in the innermost layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1137443A JPH035218A (en) | 1989-06-01 | 1989-06-01 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1137443A JPH035218A (en) | 1989-06-01 | 1989-06-01 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH035218A true JPH035218A (en) | 1991-01-11 |
Family
ID=15198744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1137443A Pending JPH035218A (en) | 1989-06-01 | 1989-06-01 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH035218A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0650908U (en) * | 1992-09-30 | 1994-07-12 | ザ・グッドイヤー・タイヤ・アンド・ラバー・カンパニー | Pneumatic tire |
| EP0615867A1 (en) * | 1993-03-16 | 1994-09-21 | Sp Reifenwerke Gmbh | Bead ring assembly for vehicle tyres |
| US5711830A (en) * | 1994-03-25 | 1998-01-27 | Continental Aktiengesellschaft | Pneumatic vehicle tire with specified bead core cross-section |
| US6542143B1 (en) | 1996-02-28 | 2003-04-01 | Seiko Epson Corporation | Method and apparatus for driving the display device, display system, and data processing device |
| KR100429102B1 (en) * | 2002-03-28 | 2004-04-29 | 카라반인터내셔날 주식회사 | Loof formative structure for frame of folding tent |
| JP2015217824A (en) * | 2014-05-19 | 2015-12-07 | 住友ゴム工業株式会社 | Pneumatic tire |
| WO2021038149A1 (en) * | 2019-08-29 | 2021-03-04 | Compagnie Generale Des Etablissements Michelin | Bead core for agricultural tyre |
| JP2021037850A (en) * | 2019-09-03 | 2021-03-11 | 住友ゴム工業株式会社 | Pneumatic tire |
-
1989
- 1989-06-01 JP JP1137443A patent/JPH035218A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0650908U (en) * | 1992-09-30 | 1994-07-12 | ザ・グッドイヤー・タイヤ・アンド・ラバー・カンパニー | Pneumatic tire |
| EP0615867A1 (en) * | 1993-03-16 | 1994-09-21 | Sp Reifenwerke Gmbh | Bead ring assembly for vehicle tyres |
| US5511600A (en) * | 1993-03-16 | 1996-04-30 | Sp Reifenwerke Gmbh | Bead ring assembly for vehicle tires including form-matched bead apex |
| US5711830A (en) * | 1994-03-25 | 1998-01-27 | Continental Aktiengesellschaft | Pneumatic vehicle tire with specified bead core cross-section |
| US6542143B1 (en) | 1996-02-28 | 2003-04-01 | Seiko Epson Corporation | Method and apparatus for driving the display device, display system, and data processing device |
| KR100429102B1 (en) * | 2002-03-28 | 2004-04-29 | 카라반인터내셔날 주식회사 | Loof formative structure for frame of folding tent |
| JP2015217824A (en) * | 2014-05-19 | 2015-12-07 | 住友ゴム工業株式会社 | Pneumatic tire |
| WO2021038149A1 (en) * | 2019-08-29 | 2021-03-04 | Compagnie Generale Des Etablissements Michelin | Bead core for agricultural tyre |
| FR3100159A1 (en) * | 2019-08-29 | 2021-03-05 | Compagnie Generale Des Etablissements Michelin | agricultural tire rod |
| JP2021037850A (en) * | 2019-09-03 | 2021-03-11 | 住友ゴム工業株式会社 | Pneumatic tire |
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