JPH0796720A - Bead core structure in tire - Google Patents
Bead core structure in tireInfo
- Publication number
- JPH0796720A JPH0796720A JP5245136A JP24513693A JPH0796720A JP H0796720 A JPH0796720 A JP H0796720A JP 5245136 A JP5245136 A JP 5245136A JP 24513693 A JP24513693 A JP 24513693A JP H0796720 A JPH0796720 A JP H0796720A
- Authority
- JP
- Japan
- Prior art keywords
- bead core
- tire
- fiber cord
- bead
- steel wire
- 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.)
- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
-
- 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/005—Reinforcements made of different materials, e.g. hybrid or composite cords
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/48—Tyre cords
-
- 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
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2022—Strands coreless
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2036—Strands characterised by the use of different wires or filaments
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2038—Strands characterised by the number of wires or filaments
- D07B2201/204—Strands characterised by the number of wires or filaments nine or more wires or filaments respectively forming multiple layers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2046—Polyamides, e.g. nylons
- D07B2205/205—Aramides
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2046—Tire cords
- D07B2501/2053—Tire cords for wheel rim attachment
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/20—Metallic fibres
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
- D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、主としてラジアルタイ
ヤ等の空気入りタイヤの構成要素であるビードコア構造
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a bead core structure which is a constituent element of a pneumatic tire such as a radial tire.
【0002】[0002]
【従来の技術と発明が解決しようとする課題】タイヤの
構成要素の中で最も剛性の高いビードコア(1)は、図
7に示すように、タイヤのビード部(B)においてカー
カスプライ(2)の端末を係止してこれを支え、タイヤ
のビード部(B)をリム(R)上に嵌着した状態に保つ
という役割を有するものであり、通常このビードコア
(1)は、ピアノ線等のスチール製の線材、所謂ビード
ワイヤ(3)の集束体から構成されている。2. Description of the Related Art A bead core (1), which has the highest rigidity among tire components, has a carcass ply (2) at a bead portion (B) of the tire, as shown in FIG. Has a role of retaining the bead portion (B) of the tire and keeping the bead portion (B) of the tire fitted on the rim (R). Usually, the bead core (1) is a piano wire or the like. The steel wire rod, a so-called bead wire (3), is a bundle.
【0003】このビードワイヤ(3)の本数および断面
形状は、タイヤサイズやタイヤ構造の違い等によって異
なるが、例えば乗用車用タイヤの場合は、図7のように
20本(縦×横=4×5)あるいは25本(縦×横=5
×5)のビードワイヤ(3)を角形に積層したビードコ
ア(1)が用いられる。またバス、トラック用等のタイ
ヤの場合は、図8のように例えば51本のビードワイヤ
(3)を6角形に積層したビードコア(1)が用いられ
る。The number and cross-sectional shape of the bead wires (3) differ depending on the tire size, tire structure, etc. For example, in the case of passenger car tires, as shown in FIG. 7, 20 (length × width = 4 × 5) ) Or 25 (length x width = 5)
A bead core (1) in which a bead wire (3) of × 5) is laminated in a rectangular shape is used. In the case of tires for buses, trucks, etc., a bead core (1) in which, for example, 51 bead wires (3) are stacked in a hexagonal shape as shown in FIG. 8 is used.
【0004】しかして、一般の空気入りタイヤにおい
て、タイヤ軽量化の要求が高まるにつれ、ビードコアの
重量が問題になってきており、このビードコアの重量を
軽減することが望まれている。However, in general pneumatic tires, the weight of the bead core has become a problem as the demand for weight reduction of the tire has increased, and it is desired to reduce the weight of the bead core.
【0005】そこで、スチール製ワイヤに代えて、これ
よりも比重が小さく軽量であって、しかも比較的張力の
高いアラミド繊維等の繊維コードをビードコアの構成線
材として用いることとしたものである。Therefore, in place of the steel wire, a fiber cord such as aramid fiber having a smaller specific gravity and a lighter weight and a relatively higher tension is used as a wire material constituting the bead core.
【0006】しかしながら、アラミド繊維等のコード
は、スチール製のワイヤに比べて引張強度が弱く、また
剛性が劣り楕円に変形し易い欠点があり、またリムに対
して充分な嵌着力を確保できないといった問題がある。However, the cord made of aramid fiber or the like has a weaker tensile strength than a steel wire and has a drawback that it is inferior in rigidity and is easily deformed into an ellipse, and sufficient fitting force cannot be secured to the rim. There's a problem.
【0007】これについてさらに検討すると、ビードコ
アは、その構成線材として、スチール製ワイヤ、繊維コ
ードのいずれを用いるにしても、これらの線材を集束体
に形成するために、例えば縦×横を5×5に積層する場
合、5本の線材を平行に引き揃えてリボン状にしたもの
を5回巻き重ねるか、あるいは1本の線材を25回5層
に巻くことにより作られる。そしてこれをビード部に配
してタイヤを成型し加硫することにりタイヤを製作する
が、通常ビード部の内径側の面がリム径に対し僅かに径
小となるように加硫成形される。As a further examination of this, whether the wire core of the bead core is made of steel wire or fiber cord, in order to form these wire rods into a bundle, for example, the length × width 5 ×. In the case of stacking on No. 5, it is made by drawing five wire rods in parallel and forming a ribbon shape and winding them five times, or by winding one wire rod five times in five layers. A tire is manufactured by arranging this in the bead portion and molding and vulcanizing the tire, which is usually vulcanized and molded so that the inner diameter side surface of the bead portion is slightly smaller than the rim diameter. It
【0008】しかし、ビードコアの巻初めの部分にはワ
イヤ等の線材の重なりのための段差が生じており、この
部分に付着されたゴム層をリム面に嵌着できるように面
一に加硫成形するために、この巻初めの部分では余分な
ゴムを押し出す反力を受けた状態になる。また、ビード
部内径がリムベースの外径より僅かに径小に形成された
ものをリムに嵌着するため、ビード部内径側のゴム成形
層が圧縮されて、前記の巻始めの部位で剪断応力が発生
する。However, there is a step at the beginning of winding of the bead core due to the overlapping of wire materials such as wires, and the rubber layer attached to this portion is flushed so that it can be fitted to the rim surface. In order to mold, at the beginning of this winding, a reaction force is exerted to push out excess rubber. Also, since the inner diameter of the bead portion is slightly smaller than the outer diameter of the rim base, it is fitted to the rim, so that the rubber molding layer on the inner diameter side of the bead portion is compressed and shear stress occurs at the winding start portion. Occurs.
【0009】しかるに、アラミド繊維コード等の繊維コ
ードは、スチール製ワイヤよりも圧縮力および剪断応力
に対して弱く、しかも繊維コードは高硬度、低破断伸度
の樹脂を含浸して固めて用いるのが一般的であるため、
コードを構成するフィラメントがコード内での動きが封
じられて束縛された状態になっている。However, the fiber cord such as the aramid fiber cord is weaker than the steel wire against the compressive force and the shear stress, and the fiber cord is impregnated with the resin having the high hardness and the low elongation at break to be solidified and used. Is common,
The filaments that make up the cord are in a constrained state, with their movement within the cord being sealed.
【0010】従って、前記のようにリムへの嵌着により
剪断応力を受けたときの破断抵抗が小さく、そのため破
断が生じたりして、リムへの嵌着力が低下あるいは不足
するものと考えられる。Therefore, as described above, it is considered that the rupture resistance when the shear stress is applied by the fitting to the rim is small, and therefore the rupture occurs and the fitting force to the rim is reduced or insufficient.
【0011】一方、スチール製ワイヤは、図9の伸びと
荷重との関係を示すグラフに見られるように、アラミド
繊維コードに比して降伏点に達してからの延び大きく、
したがって前記のように剪断変形を受けても容易に破断
することがない。On the other hand, the steel wire has a large elongation after reaching the yield point as compared with the aramid fiber cord, as shown in the graph showing the relationship between elongation and load in FIG.
Therefore, it does not easily break even when subjected to shear deformation as described above.
【0012】本発明は、上記に鑑みて、アラミド繊維コ
ード等の高張力を有する繊維コードをスチール製ワイヤ
と組合せてビードコアの構成線材として使用することと
し、タイヤとしての強度や保形性、およびリムに対する
嵌着力等を損なうことなく、軽量化を可能にするビード
コア構造を提供するものである。In view of the above, the present invention uses a fiber cord having a high tensile strength such as an aramid fiber cord in combination with a steel wire as a wire rod constituting a bead core, and has strength and shape retention as a tire, and It is intended to provide a bead core structure that enables weight reduction without impairing the fitting force to the rim.
【0013】[0013]
【課題を解決するための手段】本発明は、タイヤのビー
ド部に配される環状のビードコアであって、アラミド繊
維コード等の高張力を有する繊維コードとスチール製ワ
イヤとにより、少なくともコア内径側の第1層にはスチ
ール製ワイヤを配して構成したことを特徴とするもので
ある。SUMMARY OF THE INVENTION The present invention is an annular bead core arranged in a bead portion of a tire, which comprises a aramid fiber cord or the like having a high tensile strength and a steel wire, at least the core inner diameter side. In the first layer, a wire made of steel is arranged and configured.
【0014】[0014]
【作用】上記のビードコア構造によれば、構成線材がス
チール製ワイヤとこれより比重の小さい繊維コードとか
らなるものであるため、構成線材の全部がスチール製ワ
イヤからなる従来のビードコアに比して軽量化を図るこ
とができる。According to the above bead core structure, since the constituent wire is composed of the steel wire and the fiber cord having a smaller specific gravity than that of the steel wire, the constituent wire is entirely made of steel wire as compared with the conventional bead core. The weight can be reduced.
【0015】しかも、ビードコアの内径側の少なくとも
第1層には、剪断応力に対して強いスチール製ワイヤが
配されているため、適度の剛性や保形性を保ち、特にリ
ムに対する嵌着したときの圧縮力で、巻初めの部分に剪
断応力が生じても、構成線材が切断することはなく、リ
ムに対する締付け力を良好に保持できる。Moreover, since at least the first layer on the inner diameter side of the bead core is provided with a steel wire that is strong against shear stress, appropriate rigidity and shape retention are maintained, especially when fitted to the rim. Even if a shearing stress is generated at the beginning of winding by the compressive force, the constituent wire will not be cut, and the tightening force for the rim can be maintained well.
【0016】それゆえ、ビードコアの構成線材としてア
ラミド繊維コード等の繊維コードを使用しているにも拘
らず、剛性や引張強度の低下のおそれはなく、保形性も
良好であって、充分な嵌着力を確保できる。Therefore, although a fiber cord such as an aramid fiber cord is used as the wire material constituting the bead core, there is no fear of deterioration in rigidity or tensile strength, and the shape retaining property is good and sufficient. The fitting force can be secured.
【0017】[0017]
【実施例】次に本発明の実施例を図面に基いて説明す
る。Embodiments of the present invention will now be described with reference to the drawings.
【0018】図1は断面四角形の円環状のビードコア
(1)が配されたビード部(B)の部分断面図であり、
ビードコア(1)の回りにカーカスプライ(図示せず)
の端部が例えば内側から外側へ向けて折返されて係止さ
れる。FIG. 1 is a partial sectional view of a bead portion (B) on which an annular bead core (1) having a quadrangular cross section is arranged.
Carcass ply (not shown) around the bead core (1)
The end portion of is folded back and locked from the inside to the outside, for example.
【0019】ビードコア(1)は、その構成線材とし
て、スチール製ワイヤ(3a)と、アラミド繊維コード
等の比較的高張力を有する繊維コード(3b)とを用い
て構成され、特にリムに対し嵌着される内径側の少なく
とも第1層(1a)には、従来同様のスチール製ワイヤ
(3a)が配され、残余層に繊維コード(3b)が単独
で、あるいはスチール製ワイヤ(3a)と組合されて配
されている。The bead core (1) is composed of a steel wire (3a) and a fiber cord (3b) having a relatively high tension such as an aramid fiber cord as its constituent wire material, and is fitted particularly to the rim. At least the first layer (1a) on the inner diameter side to be attached is provided with a steel wire (3a) similar to the conventional one, and a fiber cord (3b) alone or in combination with the steel wire (3a) in the remaining layer. Are distributed.
【0020】例えば、図1の実施例においては、内径側
の第1層(1a)をスチール製ワイヤ(3a)の配列に
して、他の第2〜4層の全てを繊維コード(3b)の配
列にして積層した場合を示し、図2の実施例は、内径側
の第1層(1a)を含む周囲部をスチール製ワイヤ(3
a)にして、その内方部にのみ繊維コード(3b)を配
した場合を示している。図3の実施例は、内径側から第
1層、第3層、第5層をスチール製ワイヤ(3a)と
し、第2層と第4層とを繊維コード(3b)にして交互
に配した場合を示している。このほか、図4のように、
中間の層を全て繊維コード(3b)にして実施すること
もできる。For example, in the embodiment shown in FIG. 1, the first layer (1a) on the inner diameter side is an array of steel wires (3a), and all the other second to fourth layers are made of the fiber cord (3b). 2 shows a case of stacking in an array, and in the embodiment of FIG. 2, the steel wire (3
It shows the case where the fiber cord (3b) is arranged only in the inner part of the a). In the embodiment of FIG. 3, the first layer, the third layer, and the fifth layer are steel wires (3a) from the inner diameter side, and the second layer and the fourth layer are fiber cords (3b) and are alternately arranged. The case is shown. Besides this, as shown in FIG.
It is also possible to use all the intermediate layers as fiber cords (3b).
【0021】上記実施例のビードコア(1)は、構成線
材の本数を、縦×横を5×4または4×5の20本にし
た場合を示しているが、5×5の25本にして実施する
等、タイヤサイズやタイヤ構造に応じて適宜実施でき
る。The bead core (1) of the above embodiment shows the case where the number of constituent wire rods is 20 × 5 × 4 or 4 × 5 in length × width. It can be carried out as appropriate depending on the tire size and tire structure.
【0022】図5と図6は、トラック、バス用等のタイ
ヤにおけるビードコア構造において、少なくとも内径側
の第1層(1a)にはスチール製ワイヤ(3a)を配
し、残余の層に繊維コード(3b)を配した実施例を示
している。FIGS. 5 and 6 show a bead core structure for a tire for trucks, buses, etc., in which a steel wire (3a) is arranged at least on the first layer (1a) on the inner diameter side, and a fiber cord is formed on the remaining layer. The example which arranged (3b) is shown.
【0023】特に図5は中央2層に繊維コード(3a)
を配した場合を示し、図6はスチール製ワイヤ(3a)
と繊維コード(3b)とを交互に配した例を示してい
る。In particular, FIG. 5 shows a fiber cord (3a) in the central two layers.
Fig. 6 shows the case where the steel wire (3a) is arranged.
And an example in which the fiber cord (3b) is arranged alternately.
【0024】上記のような構造のビードコア(1)は、
その層構造によって、構成線材であるスチール製ワイヤ
(3a)および繊維コード(3b)をそれぞれ1本巻き
して積層する場合と、スチール製ワイヤ(3a)と繊維
コード(3b)とを予めリボン状に配列してこれを巻い
て積層する場合、さらにこれらを併用して積層する場合
とがある。第1層(1a)については、巻初め端がスチ
ール製ワイヤ(3a)が1本になる1本巻きとするのが
好ましい。The bead core (1) having the above structure is
Depending on the layer structure, the steel wire (3a) and the fiber cord (3b), which are the constituent wire materials, are wound one by one and laminated, and the steel wire (3a) and the fiber cord (3b) are preliminarily formed into a ribbon shape. There is a case where they are arranged in the form of, and wound and laminated, and a case where they are used together and laminated. As for the first layer (1a), it is preferable that the winding start end is a single winding having one steel wire (3a).
【0025】なお、スチール製ワイヤ(2a)および繊
維コード(3b)には、タイヤのゴム成形体部分との接
着性をよくするためにゴム被覆を施しておく。また繊維
コード(3b)については、ゴムとの接着性をよくする
目的で接着剤処理を施して用いるが、特に引張に対する
寄与率の大きい撚の少ない甘撚りのコードにして、繊維
が分離しない程度に接着剤処理を施して使用する。すな
わち樹脂加工により堅く固めてあると、剪断応力に対し
て弱くなるので、前記のように繊維が分離しない程度に
軽く接着剤処理を施しておくのがよい。The steel wire (2a) and the fiber cord (3b) are coated with rubber in order to improve the adhesiveness with the rubber molded body portion of the tire. The fiber cord (3b) is used after being treated with an adhesive for the purpose of improving the adhesiveness to rubber, but a cord having a small twist with a large contribution to tensile strength is used so that the fibers are not separated. It is used after being treated with an adhesive. That is, if it is hardened by resin processing, it becomes vulnerable to shear stress, so it is advisable to lightly treat with an adhesive so that the fibers do not separate as described above.
【0026】なお、高張力を有するコードとしては、ア
ラミド繊維コードが特に好適に用いられるが、他の高張
力を有する有機繊維コードを用いることもできる。これ
らはモノフィラメントのコードを使用することもできる
が、曲げや剪断応力に対する強度上は、マルチフィラメ
ントのコードが好ましい。An aramid fiber cord is particularly preferably used as the cord having high tension, but other organic fiber cords having high tension can also be used. Although a monofilament cord can be used for these, a multifilament cord is preferable in terms of strength against bending and shear stress.
【0027】上記のような構造のビードコア(1)を備
えたタイヤであると、ビードコア(1)の構成線材とし
て、その一部に比重が小さく軽いアラミ繊維コード等の
高張力を有する繊維コード(3b)を使用しているため
に、ビードコア全部がスチール製ワイヤよりなる従来の
ビードコアに比して大幅に軽量化できる。しかも内径側
の少なくとも第1層(1a)には、剪断応力に対して強
いスチール製ワイヤ(3a)を配しているために、適度
に充分な剛性、保形性を保有するとともに、リムへの嵌
着による圧縮力が巻初めの部分に作用しても、破断が生
じることがなく、リムに対し充分な締付け力、嵌着力を
保ち、引張強度も従来品に比し劣ることはない。In the tire provided with the bead core (1) having the above-mentioned structure, a fiber cord having a high tension such as an arami fiber cord having a small specific gravity and a light weight is used as a constituent wire of the bead core (1). Since 3b) is used, the weight of the bead core can be significantly reduced as compared with the conventional bead core made of steel wire. Moreover, since at least the first layer (1a) on the inner diameter side is provided with a steel wire (3a) that is strong against shear stress, it has a reasonably sufficient rigidity and shape retention, Even if the compressive force due to the fitting is applied to the beginning of the winding, no breakage occurs, sufficient tightening force and fitting force are maintained on the rim, and the tensile strength is not inferior to the conventional product.
【0028】下記の表1は、ビードコア(1)が図1の
構造のもの(実施例1)と、図2の構造のもの(実施例
2)と、図3の構造のもの(実施例3)と、ビードコア
(1)が図1と同じ5層構造で、その材質を全て金属製
ワイヤにしたもの(従来例)、および全てをアラミド繊
維コードにしたもの(比較例)を、重量、引張強度およ
び水圧試験の結果を比較したものである。Table 1 below shows that the bead core (1) has the structure shown in FIG. 1 (Example 1), the structure shown in FIG. 2 (Example 2), and the structure shown in FIG. 3 (Example 3). ) And a bead core (1) having the same five-layer structure as in FIG. 1 and all made of metal wire (conventional example) and all made of aramid fiber cord (comparative example). It is a comparison of the results of strength and water pressure tests.
【0029】各実施例および従来例、比較例のタイヤサ
イズは、11R22.5 14PRとし、使用した繊維
コード(3b)は、繊度12000デニールのアラミド
繊維コード、スチール製ワイヤ(3a)は、線径0.9
6mmのワイヤとして構成した。The tire size of each of the examples, the conventional example, and the comparative example was 11R22.5 14PR, the fiber cord (3b) used was an aramid fiber cord having a fineness of 12000 denier, and the steel wire (3a) was a wire diameter. 0.9
It was constructed as a 6 mm wire.
【0030】また、表1中の重量比は、ビードコア自体
の重量比であり、従来例を100として指数表示した。
また引張強度はビードコアの引張強度で、従来例を10
0として指数表示した。The weight ratio in Table 1 is the weight ratio of the bead core itself, and is shown as an index with the conventional example being 100.
The tensile strength is the tensile strength of the bead core, which is 10
It was displayed as an index of 0.
【0031】水圧試験は、試験タイヤをリム組みして、
チューブ内に水を注入し加圧する方法で行ない、安全基
準に基いて設定された圧力値で破断が生じるか否かで判
定し、従来例を100として指数で表示した。In the water pressure test, a test tire is assembled on a rim,
Water was injected into the tube to pressurize it, and it was judged whether or not breakage occurred at a pressure value set based on the safety standard.
【0032】[0032]
【表1】 [Table 1]
【0033】上記の結果から明らかなように、本発明の
実施例の場合、ビードコアの引張強度は従来例に比して
僅かに低下するが、特に水圧試験の結果では、リムに対
する嵌着力(タイヤ全体の強度)は殆ど遜色がなく、タ
イヤとしての性能を低下をさせずに、スチール製ワイヤ
のみのビードコアのタイヤに比して軽量化を図ることが
できた。As is clear from the above results, in the case of the example of the present invention, the tensile strength of the bead core is slightly lower than that of the conventional example. The overall strength) was almost comparable, and it was possible to reduce the weight as compared with a bead core tire having only steel wires without deteriorating the performance as a tire.
【0034】これに対し、アラミド繊維コードのみのビ
ードコアの場合(比較例)、大幅に軽量化できるもの
の、引張強度およびリムに対する嵌着力(水圧試験の結
果による)の低下も大きくなった。On the other hand, in the case of the bead core containing only the aramid fiber cord (comparative example), although the weight was significantly reduced, the tensile strength and the fitting force to the rim (according to the result of the hydraulic pressure test) were also greatly reduced.
【0035】[0035]
【発明の効果】上記したように本発明によれば、ビード
部の強度や保形性、さらにはリムに対する嵌着力を低下
させずに、タイヤの大幅な軽量化を図ることができる。
しかも内径側の少なくとも第1層にはスチール製ワイヤ
を配したことで、適度に良好な保形性や剛性を確保でき
るとともに、リムへの嵌着による圧縮力で巻初めの部分
に剪断応力が作用しても、構成線材の破断等したり、嵌
着力が低下するおそれがなく、充分な耐久性を有するも
のである。As described above, according to the present invention, it is possible to significantly reduce the weight of a tire without reducing the strength and shape retention of the bead portion and the fitting force to the rim.
Moreover, by arranging the steel wire on at least the first layer on the inner diameter side, it is possible to secure a reasonably good shape retainability and rigidity, and the shearing stress is applied to the rim at the beginning of the winding due to the compression force. Even if it acts, there is no fear of breaking the constituent wire rods or reducing the fitting force, and it has sufficient durability.
【0036】[0036]
【0037】[0037]
【図1】乗用車用タイヤのビードコア実施例を示す断面
図である。FIG. 1 is a cross-sectional view showing an example of a bead core of a passenger car tire.
【0038】[0038]
【図2】ビードコアの他の実施例を示す断面図である。FIG. 2 is a sectional view showing another embodiment of the bead core.
【0039】[0039]
【図3】ビードコアのさらに他の実施例を示す断面図で
ある。FIG. 3 is a sectional view showing still another embodiment of the bead core.
【0040】[0040]
【図4】ビードコアのさらに他の実施例を示す断面図で
ある。FIG. 4 is a cross-sectional view showing still another embodiment of the bead core.
【0041】[0041]
【図5】大型タイヤ用のビードコアの実施例を示す拡大
断面図である。FIG. 5 is an enlarged cross-sectional view showing an example of a bead core for a large tire.
【0042】[0042]
【図6】同上の他のビードコアの実施例を示す拡大断面
図である。FIG. 6 is an enlarged sectional view showing another embodiment of the above bead core.
【0043】[0043]
【図7】従来のビードコア構造の断面図である。FIG. 7 is a cross-sectional view of a conventional bead core structure.
【0044】[0044]
【図8】従来の他のビードコア構造の断面図である。FIG. 8 is a cross-sectional view of another conventional bead core structure.
【0045】[0045]
【図9】スチール製ワイヤとアラミド繊維コードの伸び
と荷重の関係を示すグラフである。FIG. 9 is a graph showing the relationship between elongation and load of a steel wire and an aramid fiber cord.
【0046】[0046]
(B) ビード部 (1) ビードコア (1a) 内径側の第1層 (3a) スチール製ワイヤ (3b) 繊維コード (B) Bead portion (1) Bead core (1a) First layer on inner diameter side (3a) Steel wire (3b) Fiber cord
Claims (1)
コアであって、アラミド繊維コード等の高張力を有する
繊維コードとスチール製ワイヤとにより、少なくともコ
ア内径側の第1層にはスチール製ワイヤを配して構成し
てなることを特徴とするタイヤにおけるビードコア構
造。1. A ring-shaped bead core arranged in a bead portion of a tire, wherein a fiber cord having a high tensile strength such as an aramid fiber cord and a steel wire make at least the first layer on the inner diameter side of the core made of steel. A bead core structure in a tire, which is configured by arranging wires.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5245136A JPH0796720A (en) | 1993-09-30 | 1993-09-30 | Bead core structure in tire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5245136A JPH0796720A (en) | 1993-09-30 | 1993-09-30 | Bead core structure in tire |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0796720A true JPH0796720A (en) | 1995-04-11 |
Family
ID=17129172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5245136A Withdrawn JPH0796720A (en) | 1993-09-30 | 1993-09-30 | Bead core structure in tire |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0796720A (en) |
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JP4495309B2 (en) * | 2000-06-15 | 2010-07-07 | 住友ゴム工業株式会社 | Pneumatic tire |
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US8845836B2 (en) | 2009-12-23 | 2014-09-30 | The Goodyear Tire & Rubber Company | Geodesic tire and method of manufacture |
US8973635B2 (en) | 2009-12-23 | 2015-03-10 | The Goodyear Tire & Rubber Company | Pneumatic tire with carcass cord strip wound in specified pattern |
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US9421825B2 (en) | 2009-12-23 | 2016-08-23 | The Goodyear Tire & Rubber Company | Geodesic belted tire |
WO2017075221A1 (en) * | 2015-10-28 | 2017-05-04 | Compagnie Gererale Des Etablissements Michelin | Metal hybrid bead cores for tires |
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1993
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US6622766B1 (en) | 2002-06-07 | 2003-09-23 | The Goodyear Tire & Rubber Company | Light weight cable bead core |
US6991017B2 (en) | 2002-06-07 | 2006-01-31 | The Goodyear Tire & Rubber Company | Light weight cable bead core |
WO2006128494A1 (en) * | 2005-05-30 | 2006-12-07 | Pirelli Tyre S.P.A. | Pneumatic tire with composite bead core |
JP2008542099A (en) * | 2005-05-30 | 2008-11-27 | ピレリ・タイヤ・ソチエタ・ペル・アツィオーニ | Pneumatic tire with composite bead core |
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US8845836B2 (en) | 2009-12-23 | 2014-09-30 | The Goodyear Tire & Rubber Company | Geodesic tire and method of manufacture |
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CN104057788A (en) * | 2014-06-27 | 2014-09-24 | 双钱集团(江苏)轮胎有限公司 | Novel steel wire ring structure |
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Legal Events
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