JP2002180387A - Steel cord for reinforcing tire - Google Patents
Steel cord for reinforcing tireInfo
- Publication number
- JP2002180387A JP2002180387A JP2000379568A JP2000379568A JP2002180387A JP 2002180387 A JP2002180387 A JP 2002180387A JP 2000379568 A JP2000379568 A JP 2000379568A JP 2000379568 A JP2000379568 A JP 2000379568A JP 2002180387 A JP2002180387 A JP 2002180387A
- Authority
- JP
- Japan
- Prior art keywords
- cord
- core
- strands
- tire
- steel cord
- 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
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
-
- 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
- D07B1/0626—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration the reinforcing cords consisting of three core wires or filaments and at least one layer of outer wires or filaments, i.e. a 3+N configuration
-
- 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
- D07B2201/2016—Strands characterised by their cross-sectional shape
- D07B2201/2018—Strands characterised by their cross-sectional shape oval
-
- 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
- D07B2201/2023—Strands with core
-
- 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
- D07B2201/2047—Cores
- D07B2201/2052—Cores characterised by their structure
- D07B2201/2059—Cores characterised by their structure comprising wires
- D07B2201/206—Cores characterised by their structure comprising wires arranged parallel to the axis
Landscapes
- Tires In General (AREA)
- Ropes Or Cables (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車用タイヤの
主としてベルト部の補強材として用いられるスチールコ
ード（以下、単にコードということもある）に関し、特
にタイヤのコーナリング性能を高めることができ、耐疲
労性にも優れたスチールコードに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel cord (hereinafter sometimes simply referred to as "cord") mainly used as a reinforcing material for a belt portion of an automobile tire. The present invention relates to a steel cord having excellent fatigue properties.
【０００２】[0002]
【従来の技術】従来から複層撚りコードとして、２〜３
本の芯素線を撚り合わせたコアの周囲にシースとなる複
数本の側素線を撚り合わせた偏平状断面のオープンコー
ド（例えば、特開平６−２４２０９号公報、特開平６−
３３３８３号公報等）や楕円形断面のオープンコードが
種々提案されている。また、近年、図４に示すように、
複数本の芯素線２１を横並びに配列したコア２２の周囲
にシースとなる複数本の側素線２３を撚り合わせた偏平
状断面のコード２４（以下、従来コードという）が提案
されている。（例えば、特開平９−１５８０６５号公
報、特開平１０−８３８７号公報）。2. Description of the Related Art Conventionally, as a multi-layer stranded cord, 2-3 cords have been used.
An open cord having a flat cross section in which a plurality of side strands serving as a sheath are twisted around a core in which two core strands are twisted (for example, Japanese Patent Application Laid-Open Nos.
33383) and various open cords having an oval cross section have been proposed. In recent years, as shown in FIG.
A cord 24 having a flat cross section (hereinafter referred to as a conventional cord) in which a plurality of side strands 23 serving as a sheath are twisted around a core 22 in which a plurality of core strands 21 are arranged side by side has been proposed. (For example, JP-A-9-158065 and JP-A-10-8387).
【０００３】特開平９−１５８０６５号公報に記載の従
来コードは、従来のオープンコードの芯素線が撚られて
いることからコード剛性等のコード特性が変化すること
に鑑みて、コード特性を変化させることなく偏平化を可
能とし、かつ腐食伝播によるカットセパレーションの防
止を図ることを課題としたものである。そして、上記公
報には、その構成として、無撚りでかつ横並びに列状に
配列した複数本の芯素線の周りに、複数本の側素線を前
記芯素線に外接して撚った３＋６構造、２＋７構造又は
２＋８構造のコードが記載されている。In the conventional cord described in Japanese Patent Application Laid-Open No. 9-1580065, the cord characteristic is changed in view of the fact that the cord characteristics such as the cord rigidity change due to the twist of the core wire of the conventional open cord. It is an object of the present invention to enable flattening without causing cuts and prevent cut separation due to corrosion propagation. And, in the above-mentioned publication, as a configuration, around a plurality of core strands arranged in a side-by-side and row-wise manner, a plurality of side strands are circumscribed to the core strand and twisted. Codes of 3 + 6 structure, 2 + 7 structure or 2 + 8 structure are described.
【０００４】また、特開平１０−８３８７号公報に記載
の従来コードは、従来のオープンコードの外郭形状が略
楕円であることから、ゴムの剪断力が効果的に作用せ
ず、ベルト部引張剛性を高くすることができないという
ことに鑑みて、タイヤの低燃費性能や操縦安定性等をバ
ランス良く両立するようになすことを課題とする。そし
て、上記公報には、その構成として、コード長手方向に
垂直な面におけるコード外郭形状を、一組の平行する線
と一組の互いに向かい合う円弧を有するトラック形状に
したコードが記載されている。In the conventional cord described in Japanese Patent Application Laid-Open No. 10-8387, since the outer shape of the conventional open cord is substantially elliptical, the shearing force of rubber does not act effectively, and the tensile strength of the belt portion is reduced. In view of the fact that it is not possible to increase the tire performance, it is an object of the present invention to achieve a good balance between fuel efficiency and steering stability of a tire. In the above-mentioned publication, there is described a cord in which the outer shape of the cord in a plane perpendicular to the longitudinal direction of the cord is formed into a track shape having a set of parallel lines and a set of arcs facing each other.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記従来コー
ドは、ゴムとの複合物としてタイヤに使用すると、コア
の芯素線とシースの側素線とが擦れ合って損傷する、い
わゆる“フレッティング摩耗”が生じ易い傾向にあると
いう課題があった。フレッティング摩耗が生じると、傷
付近に応力集中が生じて素線断線に至り、コードの強度
低下と耐疲労性の低下をもたらす。よって、フレッティ
ング摩耗は、タイヤの耐久性、形状安定性等の性能低下
と寿命短縮の原因になっている。However, when the above-mentioned conventional cord is used in a tire as a compound with rubber, the core strand of the core and the side strand of the sheath are rubbed against each other, so-called "fretting". There is a problem that "wear" tends to occur. When fretting wear occurs, stress concentration occurs near the flaw, resulting in wire breakage, resulting in a decrease in cord strength and fatigue resistance. Therefore, fretting wear causes performance deterioration such as tire durability and shape stability and shortens the life.
【０００６】そこで、本発明者は、上記従来コードにつ
いてフレッティング摩耗の状況を鏤々研究したところ、
従来コード２４は、図４に示す、コア２２両側の芯素線
２１，２１とこれら芯素線に外接するシースの側素線２
３，２３との接触点Ｐ，Ｐ付近において、摩耗量が大き
いことが判明した。その原因を分析したところ、従来コ
ードは、コード横断面における両端部（以下、コード両
端部という）の側素線がコア両側の芯素線（以下、両側
芯素線という）に沿う小さい曲率半径で長手方向に連続
して接触していることに起因して、タイヤの変形による
外力がコードに繰り返し加わると、摩擦力が接触点Ｐ付
近において局部的に大きくなって、両素線の摩耗進行が
激しくなることを知見した。Accordingly, the present inventor has conducted a series of studies on the fretting wear of the above-mentioned conventional cord.
The conventional cord 24 includes core strands 21 and 21 on both sides of the core 22 and side strands 2 of a sheath circumscribing these core strands, as shown in FIG.
It was found that the amount of wear was large in the vicinity of the contact points P, P with 3, 23. Analysis of the cause revealed that the conventional cord had a small radius of curvature along both sides of the core (hereinafter referred to as both ends of the cord) along the core strands on both sides of the core (hereinafter referred to as both-side core strands). When the external force due to the deformation of the tire is repeatedly applied to the cord due to the continuous contact in the longitudinal direction, the frictional force locally increases near the contact point P, and the abrasion of both wires progresses. Became intense.
【０００７】ところで、一般に、タイヤの性能として、
耐久性の他に、軽量化と燃費の向上等が要求されてい
る。その上、最近、自動車の高性能化と高速道路の普及
や舗装道路の増加に伴って、カーブを高速で走行する可
能性が増加する傾向にあることから、コーナリング性の
向上が重要になってきている。ここでいう、コーナリン
グ性とは、カーブを高速でも安全に走行できる性能のこ
とを意味する。[0007] By the way, generally, as the performance of a tire,
In addition to durability, weight reduction and improvement in fuel efficiency are required. In addition, the possibility of traveling at high speeds on curves tends to increase with the recent increase in the performance of automobiles, the spread of expressways, and the increase of paved roads. ing. Here, the cornering property means a performance that allows the vehicle to travel safely on a curve even at a high speed.
【０００８】上記コーナリング性の良否は、タイヤ幅方
向（回転方向に対する直角方向）の曲げ剛性の大小によ
って左右される。というのは、タイヤは、カーブ走行時
において、接地部分がタイヤ幅方向に変形するが、コー
ナリング性を向上するには、地面から離れる瞬間に変形
状態から可及的速やかに復元することが必要であり、こ
の復元にはタイヤ幅方向の曲げ剛性が大きいことが必要
となるからである。また、タイヤ幅方向の曲げ剛性が大
きいタイヤは低燃費化に寄与すると言われ、最近、この
ようなタイヤの高性能化に寄与するコードの開発が求め
られている。[0008] The quality of the cornering performance depends on the magnitude of the bending stiffness in the tire width direction (perpendicular to the rotation direction). This is because the tire deforms in the tire width direction at the time of curve running, but in order to improve cornering, it is necessary to restore the deformed state as soon as possible from the ground as soon as it leaves the ground. This is because this restoration requires a large flexural rigidity in the tire width direction. Also, a tire having a large flexural rigidity in the tire width direction is said to contribute to low fuel consumption, and recently, there is a demand for development of a cord that contributes to such a high performance tire.
【０００９】本発明は、複数本の芯素線を隣接して並べ
たコアの周囲に、シースとなる複数本の側素線を撚り合
わせた偏平状断面のスチールコードにおいて、コード両
端部におけるフレッティング摩耗の発生を防止して耐疲
労性を向上し、タイヤの耐久性、タイヤ幅方向の曲げ剛
性、コーナリング性及び形状安定性の向上に寄与すると
共に、低燃費化と軽量化を可能にしたタイヤ補強用スチ
ールコードを提供することを課題とする。The present invention relates to a flat-section steel cord in which a plurality of side strands serving as a sheath are twisted around a core in which a plurality of core strands are arranged adjacent to each other. In addition to improving tire resistance, improving tire durability, flexural rigidity in the width direction of the tire, cornering properties and shape stability, it also contributes to lower fuel consumption and weight. It is an object to provide a steel cord for reinforcing a tire.
【００１０】[0010]
【課題を解決するための手段】上記課題を解決するため
に、本発明のスチールコードは、両側芯素線の外側部分
に位置する側素線が、両側芯素線との間にゴム浸透可能
な隙間を有して配置されてなる。In order to solve the above-mentioned problems, a steel cord according to the present invention is characterized in that a side wire located on an outer portion of a both-side core wire is capable of penetrating rubber between the two-sided core wire. It is arranged with a suitable gap.
【００１１】この手段によるときは、側素線が両側芯素
線の外側部分に位置するとき両側芯素線との間にゴム浸
透可能な隙間を有しているから、ゴム材に埋設すると、
ゴム材が、上記隙間に浸透して、両側芯素線とその外側
の側素線との間にコード長手方向全般にわたって存在す
ることになる。そして、隙間に浸透したゴム材は、タイ
ヤの変形による外力がコードに繰り返し加わった場合、
一種の緩衝材として作用する。従って、両側芯素線とそ
の外側の側素線との接触が殆ど無くなり、また、上記隙
間に浸透したゴム材の量（厚み）が少なくて、たとえ両
側芯素線と側素線とが接触したとしても、その摩擦力が
大幅に低減して、コード両側部におけるフレッティング
摩耗の発生が殆ど解消され、耐疲労性が大幅に向上す
る。According to this means, when the side strands are located outside the two sided core strands, there is a gap between the two sided core strands so that rubber can penetrate.
The rubber material penetrates into the gap and exists between the core wires on both sides and the side wires outside the core wires over the entire length of the cord. And the rubber material that has penetrated into the gap, when external force due to deformation of the tire is repeatedly applied to the cord,
Acts as a kind of cushioning material. Therefore, there is almost no contact between the both-side core strand and the outer side strand, and the amount (thickness) of the rubber material permeated into the gap is small. Even so, the frictional force is greatly reduced, fretting wear on both sides of the cord is almost eliminated, and the fatigue resistance is greatly improved.
【００１２】この発明において、各芯素線の中心を結ぶ
線と交差する位置の側素線と両側芯素線との隙間として
は０．０２〜０．２０ｍｍであることが好ましい。とい
うのは、この範囲より小さくなるとゴム材の浸透が困難
になり、コード両端部の側素線と両側芯素線との擦れ合
いによる摩耗損傷の防止又は低減が困難になる傾向があ
り、また一方大きくなるとコアの芯素線とシースの側素
線とがばらつくようになり、コードとしての一体構造が
損なわれて、コードの耐疲労性が低下する傾向があるか
らである。ところで、上記隙間の値は、コード長手方向
の隙間の平均値である。この平均値を求めるには、コー
ド長手方向における任意の５箇所以上の隙間を計測し、
その平均値を算出する。実際に隙間を計測する方法を以
下に述べる。ゴム材に埋め込む前のコードの状態で隙間
を計測する場合には、５ｃｍ程度にコードを切断したも
のを硬質樹脂に埋め込んだ後、コード長手方向に数ミリ
おきに研摩して、それぞれの研摩面で拡大断面写真を撮
り、写真上で隙間の大きさを計測して平均値を出す。ま
た、ゴム材（タイヤ）に埋め込んだ後で隙間を計測する
場合には、コードを含んだゴム材を５ｃｍ程度切り出
し、硬質樹脂に埋め込んで、上記と同様の方法で隙間の
平均値を出す。In the present invention, the gap between the side strands at the position intersecting with the line connecting the centers of the respective core strands and the both side strands is preferably 0.02 to 0.20 mm. That is, if it is smaller than this range, it becomes difficult for the rubber material to penetrate, and there is a tendency that it is difficult to prevent or reduce wear damage due to rubbing between the side strands at both ends of the cord and both side strands. On the other hand, when the size is increased, the core strands of the core and the side strands of the sheath vary, and the integral structure of the cord is impaired, and the fatigue resistance of the cord tends to decrease. By the way, the value of the gap is an average value of the gap in the cord longitudinal direction. To find this average value, measure any five or more gaps in the longitudinal direction of the cord,
The average value is calculated. A method for actually measuring the gap will be described below. When measuring the gap in the state of the cord before embedding it in rubber material, cut the cord to about 5 cm, embed it in hard resin, and then grind it every few millimeters in the longitudinal direction of the cord, and make each polished surface Take a magnified cross-sectional photo with, measure the size of the gap on the photo and get the average value. When measuring the gap after embedding in a rubber material (tire), a rubber material including a cord is cut out about 5 cm, embedded in a hard resin, and an average value of the gap is obtained by the same method as described above.
【００１３】また、コードを構成する素線の本数として
は、芯素線が３〜５本であり、側素線が６〜１３本であ
ることが好適である。このようにすると、ゴムとの複合
体としてタイヤに埋設した場合、タイヤ幅方向の曲げ剛
性が大きくなり、コーナリング性、形状安定性及び低燃
費性能に優れたタイヤとすることができる。芯素線が３
本未満になると、コードの偏平比（幅／厚み）が小さく
なりすぎて、タイヤに埋設した場合、タイヤ幅方向の曲
げ剛性が小さくなり、５本を越えると、芯素線を同一平
面上に並列し難くなって、コードの外郭形状がコード長
手方向において大きく変化して、耐疲労性低下の原因に
なるからである。また、側素線が、６本未満であると、
芯素線本数に対して少なくなりすぎて、コアの周囲に配
置することが困難になり、ゴム浸透性が悪くなるだけで
なく、コード長手方向における形状安定性が損なわれて
耐疲労性に悪影響を及ぼし易くなり、一方１３本を越え
ると、芯素線に対する側素線本数が多過ぎて、側素線が
“だぶつく”ようになり、やはりコード長手方向におけ
る形状安定性が悪くなり耐疲労性が低下するからであ
る。The number of strands constituting the cord is preferably 3 to 5 core strands and 6 to 13 side strands. In this way, when embedded in a tire as a composite with rubber, bending rigidity in the tire width direction is increased, and a tire having excellent cornering properties, shape stability, and low fuel consumption performance can be obtained. 3 core strands
If it is less than this, the flatness ratio (width / thickness) of the cord becomes too small, and when embedded in a tire, the bending rigidity in the tire width direction becomes small. This is because it becomes difficult to arrange the cords, and the outer shape of the cords changes greatly in the longitudinal direction of the cords, which causes a reduction in fatigue resistance. If the number of side strands is less than 6,
It becomes too small for the number of core strands, making it difficult to arrange around the core, which not only deteriorates rubber permeability, but also impairs shape stability in the longitudinal direction of the cord and adversely affects fatigue resistance. On the other hand, if it exceeds 13, on the other hand, the number of side strands with respect to the core strand will be too large, and the side strands will be "sloppy", and the shape stability in the longitudinal direction of the cord will also deteriorate, resulting in fatigue resistance. This is because the property is reduced.
【００１４】ところで、本発明のコードとしては、シー
スがコアの略周囲との間に隙間を有して配置された構成
が好適である。このようにすると、コアの周囲がゴム材
によって完全に被覆され易くなり、タイヤ内に浸入した
水分に起因する錆の伝播によるセパレーション現象の発
生をより一層確実に防止可能になるからである。ここ
で、コアの略周囲とは、シースの側素線の全てがコアの
芯素線と非接触の状態をいうのではなく、コアを挟んで
上下に位置する任意の側素線の１乃至２本がコード長手
方向において部分的に芯素線に点接触することを意味す
る。By the way, as the cord of the present invention, it is preferable that the sheath is disposed with a gap between the sheath and substantially the periphery of the core. This makes it easier to completely cover the periphery of the core with the rubber material, thereby making it possible to more reliably prevent the occurrence of the separation phenomenon due to the propagation of rust caused by the moisture permeated into the tire. Here, the term “substantially around the core” does not mean a state in which all of the side strands of the sheath are not in contact with the core strand of the core, but one to one of arbitrary side strands located above and below the core. This means that the two wires partially make point contact with the core strand in the longitudinal direction of the cord.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態につい
て図に基づいて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１６】図１に示す実施の形態のコード４は、３本
の芯素線１を同一平面上に引き揃えて隣接して並べたコ
ア２の周囲に、シースとなる８本の側素線３をコード長
手方向同一向きの偏平螺旋状に巻き付けた構造であり、
両側芯素線１，１とコード両端部の側素線３，３との間
に、隙間Ｃを設けて成る。図２に示す実施の形態のコー
ド８は、４本の芯素線５からなるコア６の周囲に、シー
スとなる９本の側素線７を、両側芯素線５，５とコード
両端部の側素線７，７との間に、隙間Ｃを設けてコード
長手方向同一向きの偏平螺旋状に巻き付けた構造であ
る。図３に示す実施の形態のコード１２は、５本の芯素
線９からなるコア１０の周囲に、シースとなる１０本の
側素線１１を、両側芯素線９，９とコード両端部の側素
線１１，１１との間に、隙間Ｃを設けてコード長手方向
同一向きの偏平螺旋状に巻き付けた構造である。The cord 4 according to the embodiment shown in FIG. 1 has eight core strands that are sheathed around a core 2 in which three core strands 1 are aligned on the same plane and arranged adjacent to each other. 3 is a flat spiral wound in the same direction in the cord longitudinal direction,
A gap C is provided between the side core wires 1, 1 and the side wires 3, 3 at both ends of the cord. The cord 8 according to the embodiment shown in FIG. 2 has nine side strands 7 serving as sheaths around a core 6 composed of four core strands 5, and both ends of the cords 5, 5 and both ends of the cord. In this structure, a gap C is provided between the side wires 7 and 7, and the cord is wound in a flat spiral shape in the same direction in the cord longitudinal direction. The cord 12 according to the embodiment shown in FIG. 3 has ten side strands 11 serving as a sheath around a core 10 composed of five core strands 9, and both ends of the cords 9, 9 and both ends of the cord. A gap C is provided between the side strands 11 and 11, and the cord is wound in a flat spiral shape in the same direction in the cord longitudinal direction.
【００１７】上記コード４，８，１２は、芯素線径が側
素線径より小さい場合の実施の形態であるが、芯素線径
と側素線径とを同一にしてもよいし、逆に芯素線径を側
素線径より大きくしてもよい。いずれの場合でも、各素
線径としては、０．２０〜０．４０ｍｍ程度の範囲で適
当に選択して設定することができる。The cords 4, 8, and 12 are embodiments in which the core strand diameter is smaller than the side strand diameter. However, the core strand diameter and the side strand diameter may be the same. Conversely, the core strand diameter may be larger than the side strand diameter. In any case, each element wire diameter can be appropriately selected and set in a range of about 0.20 to 0.40 mm.
【００１８】ところで、上記コードは、バンチャー型の
撚線機を用いて、芯素線の束の周囲に、複数本の側素線
を巻き付けた後、所定のローラ間隔に設定した圧延ロー
ラで以って、コード全体を圧延加工する製造方法によっ
て製造することができる。ところで、上記撚線機に代え
て、チューブラ型の撚線機や簡易な回転式の撚り装置を
用いることもできる。The above-mentioned cord is formed by winding a plurality of side strands around a bundle of core strands using a buncher-type twisting machine, and then using a rolling roller set at a predetermined roller interval. Therefore, the cord can be manufactured by a manufacturing method of rolling the entire cord. By the way, instead of the above-mentioned twisting machine, a tubular twisting machine or a simple rotary twisting device can be used.
【００１９】[0019]
【発明の効果】本発明によれば、次の効果を有する。コ
ード両端部において、側素線が両側芯素線と隙間を有し
て配置されているから、浸透したゴム材が両側芯素線と
その外側の側素線との間にコード長手方向全般にわたっ
て存在することになる。よって、従来コードで課題にな
っていたコード両端部におけるフレッティング摩耗の発
生を殆ど解消することができると共に、耐疲労性を大幅
に向上することができ、タイヤ寿命の大幅な延長を図る
ことができる。また、タイヤ幅方向の曲げ剛性を大きく
できるので、コーナリング性、形状安定性及び低燃費性
能に優れたタイヤとすることができる。さらに、長手方
向に同一向きの偏平断面形状であるから、タイヤのベル
ト部の厚みを薄くでき、タイヤの軽量化を図ることがで
きる。According to the present invention, the following effects can be obtained. At both ends of the cord, the side strands are arranged with a gap between both side strands, so that the infiltrated rubber material is disposed between the both side strands and the outer side strands throughout the cord longitudinal direction. Will exist. Therefore, occurrence of fretting wear at both ends of the cord, which has been a problem in the conventional cord, can be almost eliminated, fatigue resistance can be significantly improved, and tire life can be greatly extended. it can. In addition, since the bending rigidity in the tire width direction can be increased, a tire having excellent cornering properties, shape stability, and low fuel consumption performance can be obtained. Further, since the tire has a flat cross-sectional shape in the same direction in the longitudinal direction, the thickness of the belt portion of the tire can be reduced, and the weight of the tire can be reduced.
【図１】 本発明のスチールコードの実施形態を示す断
面図である。FIG. 1 is a sectional view showing an embodiment of a steel cord of the present invention.
【図２】 本発明のスチールコードの他の実施形態を示
す断面図である。FIG. 2 is a sectional view showing another embodiment of the steel cord of the present invention.
【図３】 本発明のスチールコードのさらに他の実施形
態を示す断面図である。FIG. 3 is a sectional view showing still another embodiment of the steel cord of the present invention.
【図４】 従来例のスチールコードを示す概略断面図で
ある。FIG. 4 is a schematic sectional view showing a steel cord of a conventional example.
１，５，９ 芯素線 ２，６，１０ コア ３，７，１１ 側素線 ４，８，１２ スチールコード Ｃ 間隙 1,5,9 core strand 2,6,10 core 3,7,11 side strand 4,8,12 steel cord C gap
Claims (3)
周囲に、シースとなる複数本の側素線を撚り合わせた偏
平状断面のスチールコードであって、コア両側の芯素線
の外側部分に位置する側素線が、上記芯素線との間にゴ
ム浸透可能な隙間を有して配置されたことを特徴とする
タイヤ補強用スチールコード。1. A steel cord having a flat cross section in which a plurality of side strands serving as a sheath are twisted around a core in which a plurality of core strands are arranged adjacent to each other, wherein the core strands on both sides of the core are provided. A steel cord for reinforcing a tire, wherein a side element wire located at an outer portion of the wire is arranged with a gap permeable to rubber between the core element and the core element.
の側素線とコア両側の芯素線との隙間が０．０２〜０．
２０ｍｍである請求項１に記載のタイヤ補強用スチール
コード。2. A gap between a side strand at a position intersecting a line connecting the centers of the core strands and core strands on both sides of the core is 0.02 to 0.2 mm.
The steel cord for reinforcing a tire according to claim 1, which is 20 mm.
１３本である請求項１または２に記載のタイヤ補強用ス
チールコード。3. The number of core strands is 3 to 5, and the number of side strands is 6 to 5.
The steel cord for reinforcing a tire according to claim 1, wherein the number is 13 cords.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000379568A JP2002180387A (en) | 2000-12-14 | 2000-12-14 | Steel cord for reinforcing tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000379568A JP2002180387A (en) | 2000-12-14 | 2000-12-14 | Steel cord for reinforcing tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002180387A true JP2002180387A (en) | 2002-06-26 |
Family
ID=18847909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000379568A Pending JP2002180387A (en) | 2000-12-14 | 2000-12-14 | Steel cord for reinforcing tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002180387A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008026272A1 (en) | 2006-08-31 | 2008-03-06 | Bridgestone Corporation | Steel cord |
| JP2010168670A (en) * | 2009-01-20 | 2010-08-05 | Kanai Hiroaki | Steel cord for reinforcing rubber product |
| JP2010216047A (en) * | 2009-03-18 | 2010-09-30 | Kanai Hiroaki | Steel cord for reinforcing rubber product |
| WO2012063819A1 (en) * | 2010-11-08 | 2012-05-18 | 株式会社ブリヂストン | Pneumatic tire |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000336584A (en) * | 1999-05-31 | 2000-12-05 | Bridgestone Corp | Steel cord for reinforcing rubber article, its production and pneumatic radial tire |
| JP2000336585A (en) * | 1999-05-31 | 2000-12-05 | Bridgestone Corp | Steel cord for reinforcing rubber article, its production and pneumatic radial tire |
-
2000
- 2000-12-14 JP JP2000379568A patent/JP2002180387A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000336584A (en) * | 1999-05-31 | 2000-12-05 | Bridgestone Corp | Steel cord for reinforcing rubber article, its production and pneumatic radial tire |
| JP2000336585A (en) * | 1999-05-31 | 2000-12-05 | Bridgestone Corp | Steel cord for reinforcing rubber article, its production and pneumatic radial tire |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008026272A1 (en) | 2006-08-31 | 2008-03-06 | Bridgestone Corporation | Steel cord |
| US7870715B2 (en) | 2006-08-31 | 2011-01-18 | Bridgestone Corporation | Steel cord |
| JP2010168670A (en) * | 2009-01-20 | 2010-08-05 | Kanai Hiroaki | Steel cord for reinforcing rubber product |
| JP2010216047A (en) * | 2009-03-18 | 2010-09-30 | Kanai Hiroaki | Steel cord for reinforcing rubber product |
| WO2012063819A1 (en) * | 2010-11-08 | 2012-05-18 | 株式会社ブリヂストン | Pneumatic tire |
| RU2570512C2 (en) * | 2010-11-08 | 2015-12-10 | Бриджстоун Корпорейшн | Pneumatic tyre |
| US9211763B2 (en) | 2010-11-08 | 2015-12-15 | Bridgestone Corporation | Pneumatic tire |
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