JPH0880706A - Belt of radial tire - Google Patents

Belt of radial tire

Info

Publication number
JPH0880706A
JPH0880706A JP6247204A JP24720494A JPH0880706A JP H0880706 A JPH0880706 A JP H0880706A JP 6247204 A JP6247204 A JP 6247204A JP 24720494 A JP24720494 A JP 24720494A JP H0880706 A JPH0880706 A JP H0880706A
Authority
JP
Japan
Prior art keywords
belt
cord
pitch
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.)
Withdrawn
Application number
JP6247204A
Other languages
Japanese (ja)
Inventor
Kotaro Isaji
孝太郎 伊佐治
Keishiro Oda
圭司郎 織田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Tire Corp
Original Assignee
Toyo Tire and Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyo Tire and Rubber Co Ltd filed Critical Toyo Tire and Rubber Co Ltd
Priority to JP6247204A priority Critical patent/JPH0880706A/en
Publication of JPH0880706A publication Critical patent/JPH0880706A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B1/00Constructional features of ropes or cables
    • D07B1/06Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606Reinforcing cords for rubber or plastic articles
    • D07B1/0646Reinforcing cords for rubber or plastic articles comprising longitudinally preformed wires
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/0057Reinforcements comprising preshaped elements, e.g. undulated or zig-zag filaments
    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B2201/00Ropes or cables
    • D07B2201/20Rope or cable components
    • D07B2201/2015Strands
    • D07B2201/2022Strands coreless

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

PURPOSE: To prevent separation from taking place and to improve durability, by reinforcing a belt with a steel cord which has its tensile strength equal to or more than a specified value as a result of twisting at a specified pitch element wire consisting of one or two pieces of element wire which has a diameter of a specified value and is previously formed into rugated or helix-like shape at a pitch different from a twisting pitch and unshaped element wire of the same diameter. CONSTITUTION: A belt 1 is arranged on the perimeter of a carcass 4 which is reinforced with cord arranged almost at a right angle to the circumferential direction of a tire and is laminated with belt plies 3, 3' reinforced by many pieces of steel cord 2 arranged at an angle of 15 to 30 degrees to the circumferential direction of the tire in such a manner that the cord inclining direction of one of the plies is in the opposite direction to that of the other. For the steel cord 2, one piece of element wire 5 formed into corrugated or helix-like shape 5a, which has a diameter ranging from 0.20 to 0.40mm and contains carbon quantity ranging from 0.75 to 0.85%, is twisted at a pitch ranging from 15 to 40mm together with two pieces of unshaped element wire 6 of the same diameter, while a gap 8 allowing rubber for embedding to invade in is formed in space 7 formed in the center of the cord, and tensile strength of the cord is specified as to be equal to 310kg/mm<2> or more than that.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、スチールコードで補強
したベルトプライで発生するゴムとスチールコードとの
開離を封じながら製造コストを低減した空気入りラジア
ルタイヤのベルトに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt for a pneumatic radial tire, in which the production cost is reduced while preventing the separation between the rubber and the steel cord generated by the belt ply reinforced with the steel cord.

【0002】[0002]

【従来の技術】一般に、破断荷重が同じであるスチール
コードの場合、スチールコードを構成する素線を細くし
て本数を多くするほど靭性が大になるが、強度の撚減り
がありまた素線本数が多くなるほど単位長さのスチール
コードを製造するに要する素線の延べ長さが大になって
スチールコード製造工程での伸線コストが上がり価格が
高くなる。乗用車用ラジアルタイヤのベルトプライを補
強するスチールコードには靭性と価格が均衡した5本の
素線を撚合わせ1×5構造、2本の素線を引き揃えた素
線群と2本の素線を撚合わせた2+2構造等のスチール
コードが使用されていた。これらのスチールコードはも
とよりタイヤに使用されるほとんどのスチールコードは
撚構造を安定させて切断端がバラケないようにするとと
もに弾性率を高く保つため通常撚ピッチを約10mmにし
ていた。
2. Description of the Related Art Generally, in the case of steel cords having the same breaking load, the toughness increases as the number of strands forming the steel cords increases and the number of strands increases. As the number of the steel cords increases, the total length of the strand required to manufacture the steel cord of a unit length increases, and the wire drawing cost in the steel cord manufacturing process increases and the price increases. The steel cord that reinforces the belt ply of radial tires for passenger cars has a 1x5 structure in which five strands with a balanced toughness and price are twisted together, a strand group consisting of two strands aligned and two strands. Steel cords such as a 2 + 2 structure in which wires were twisted were used. In addition to these steel cords, most steel cords used for tires usually have a twist pitch of about 10 mm in order to stabilize the twist structure to prevent the cut ends from varying and to keep the elastic modulus high.

【0003】近年、鉄材の精練技術の向上に伴い、線径
を太くして靭性が低下しても実用できる程度に留まる素
線が得られるようになったので、コスト削減、軽量化を
図るため強度の撚減りが少なく、低価格の1×3構造の
スチールコードをタイヤのベルトに使用することが特開
平3−64585,同3−76882、同3−6540
8、同5−246206に提案されている。これら提案
のスチールコードはJIS G3502が規定する炭素
含有量0.70〜0.75%のSWRS72を原料にし
て製造され、強度は270kg/mm2 以下である。
[0003] In recent years, with the improvement of refining technology for iron materials, it has become possible to obtain a wire that can be used practically even if the wire diameter is made thicker and the toughness is lowered. Japanese Patent Laid-Open Nos. 3-64585, 3-76882 and 3-6540 use a low cost steel cord having a 1 × 3 structure with little twisting of strength for a tire belt.
8 and 5-246206. These proposed steel cords are manufactured from SWRS72 having a carbon content of 0.70 to 0.75% specified by JIS G3502 as a raw material, and have a strength of 270 kg / mm 2 or less.

【0004】[0004]

【発明が解決しようとする課題】前記の3本の素線を撚
合わせた1×3構造のスチールコードは素線同士が密接
しているので、ゴムに埋設してベルトプライにし、タイ
ヤに組み込まれたスチールコードの素線はタイヤ使用中
の繰り返し変形によって相互に摩擦、摩滅して強度低下
いわゆるフレッチングを生じやすい。また、素線の幾何
学的配置からスチールコードの中心に形成される空間に
釘等を踏んでトレッドに生じた傷と素線間の間隙を通っ
て水分が侵入し、空間内全面に広がって素線を錆させ、
強度低下と接着低下が生じ、セパレーションの原因にな
っている。
Since the steel cords of the 1 × 3 structure in which the three strands are twisted are closely attached to each other, the strands are embedded in rubber to form a belt ply and incorporated into a tire. The formed steel cord strands are liable to be rubbed against each other and worn away due to repeated deformation during use of the tire, resulting in so-called fretting with reduced strength. Also, due to the geometrical arrangement of the strands, moisture penetrates into the space formed in the center of the steel cord through the gap between the strands and the scratches on the tread when a nail is stepped on and spreads over the entire space. Rust the wires,
The strength and adhesion are reduced, causing separation.

【0005】フレッチング、スチールコード内への水分
の侵入によるセパレーションの発生を防止するため、特
開平3−64585、同5−246206には素線の1
本または2本に撚ピッチと異なるピッチで予め形付けし
てから撚合わせて素線間に埋設ゴムが侵入する間隙を設
ける方法が提案されている。これらの提案は耐疲労性を
保持するため5〜10mmの撚ピッチが選択されているの
で、スチールコードが被覆ゴムでトッピングされる際ま
たはタイヤに組み込まれて加硫される際に加えられる張
力の作用でコード軸方向に対して傾斜している素線が倒
れるように変形して素線同士が締め付けられるような動
きをし、素線間隙が塞がれ素線間の間隙を通ってスチー
ルコードの中心に侵入するゴムが不十分となりスチール
コード中心に水分が広がる空間が残る。本発明はベルト
を形成するスチールコードをその中心に幾何学的に形成
される空間にゴムが侵入しやすい形状にしてセパレーシ
ヨンの発生を封じ、コストを低減しながら耐久性が向上
するようにラジルタイヤのベルトを改良することを課題
とする。
In order to prevent the occurrence of separation due to the fretting and the intrusion of water into the steel cord, Japanese Unexamined Patent Publication Nos. 3-64585 and 5-246206 disclose the wire
A method has been proposed in which two or more pieces are preliminarily shaped at a pitch different from the twist pitch and then twisted to provide a gap between the wires for the embedded rubber to enter. Since these proposals select a twist pitch of 5 to 10 mm to maintain fatigue resistance, the tension applied when steel cords are topped with coated rubber or incorporated into tires and vulcanized. By the action, the wires that are inclined with respect to the axial direction of the cord are deformed so as to fall and the wires are tightened, the wire gap is closed and the steel cord passes through the gap between the wires. The rubber that penetrates into the center of the steel cord becomes insufficient, leaving a space for water to spread to the center of the steel cord. The present invention uses a steel cord forming a belt to form a shape in which rubber easily penetrates into a geometrically formed space around the steel cord to prevent the occurrence of separation and reduce the cost while improving the durability of the radial tire. The task is to improve the belt.

【0006】[0006]

【課題を解決するための手段】ベルト構造を形成するス
チールコードに、炭素含有量を従来より多い0.75〜
0.85%にし、シリコンを0.5〜1.0%、ニッケ
ルを0.1%〜0.2%の範囲で添加し、非金属介在物
の大きさを10μm以下にして炭素添加量増量による靭
性の低下を補完した鉄材を従来より太径に伸線すること
により、高強度で低価格の素線を使用し、撚ピッチを長
くすることによりセパレーションの発生を低下させなが
らスチールコードのコスト低減が図れることの知見を得
てこの発明をなしたものである。
[Means for Solving the Problems] The steel cord forming the belt structure has a carbon content of 0.75, which is higher than that of the conventional steel cord.
0.85%, silicon 0.5-1.0%, nickel 0.1-0.2%, the size of non-metallic inclusions is 10 μm or less, and the amount of carbon added is increased. The steel cord, which has a higher strength and a lower price, is used by drawing a steel material that complements the decrease in toughness due to the steel wire to a larger diameter than before, and the length of the twist pitch reduces the occurrence of separation while reducing the occurrence of separation. The present invention has been made with the knowledge that reduction can be achieved.

【0007】すなわち、ラジアルタイヤのカーカスの外
周に配置され、炭素含有量が0.75〜0.85%の素
線の3本を撚合わせた1×3構造のスチールコードをタ
イヤ周方向に対して15〜30度の角度で多数配列して
補強したベルトプライの複数層を積層してなるラシアル
タイヤのベルトにおいて、予め撚ピッチと異なるピッチ
で波形または螺旋状に形付けされた1本または2本の径
が0.20〜0.40mmの素線と形付けされていない同
径の素線との3本を15〜40mmピッチで撚り合わせて
なり、引張強度が310kg/mm2 以上のスチールコード
で補強されたラジアルタイヤのベルトである。
That is, a steel cord having a 1 × 3 structure, which is arranged on the outer circumference of a carcass of a radial tire and is formed by twisting three strands of carbon having a carbon content of 0.75 to 0.85%, in the tire circumferential direction. A belt of a radial tire formed by laminating a plurality of layers of reinforced belt plies arranged at an angle of 15 to 30 degrees, one or two preliminarily corrugated or spirally shaped at a pitch different from the twist pitch. A steel cord with a tensile strength of 310 kg / mm 2 or more, which is made by twisting three strands with a diameter of 0.20 to 0.40 mm and unshaped wires of the same diameter at a pitch of 15 to 40 mm. It is a radial tire belt reinforced with.

【0008】[0008]

【作用】ベルトプライを、スチール単線で補強した場合
は撚構造を持たないので耐疲労性が劣り、素線2本でな
るスチールコードで補強した場合はコード断面が偏平に
なっているので長手方向に寝ている部分と立っている部
分が交互に現れてゴム引き層の表面が凹凸になって積層
したとき界面に空気が包み込まれ好ましくない。スチー
ルコードは、3本以上の素線で形成すれば偏平でなくな
るが、細いほどベルトが薄くなって低発熱になるのと、
コストの点から素線本数が最低の3本が選択され、素線
径は0.20mm〜0.40mmの範囲が選択される。3本
の素線の内1本または2本が撚ピッチと異なったピッチ
で波形または螺旋状に形付けされていて、隣接する素線
に対して形付けの凸部になっている部分では隣接素線と
接触し、凹部では離間していてゴムの侵入路を形成す
る。過度に形付けされたとき、形付けされた素線が伸び
やすくなっていて、応力が作用したとき伸びて応力を緩
和するため一緒に撚込まれた形付けされていない素線に
応力が集中しスチールコードの強度低下する。形付けの
大きさは強度の低下で定め、少なくとも310kg/mm2
になるように形付け条件を設定する。そうすることによ
り強度低下による鉄材使用量の増加、言い替えればコス
トの上昇をなくしうる。素線径が0.2mm未満ではベル
トに必要な強度を持たせるに要する素線の延べ長さが大
になってコストが上がり、0.4mmを越えれば耐疲労性
が低下する。
[Function] When the belt ply is reinforced with a single steel wire, it does not have a twisted structure, so the fatigue resistance is poor. When reinforced with a steel cord consisting of two strands, the cord cross section is flat, so the longitudinal direction. When sleeping and standing portions appear alternately, the surface of the rubberized layer becomes uneven, and when laminated, air is wrapped in the interface, which is not preferable. If the steel cord is made of 3 or more strands, it will not be flat, but the thinner the cord, the thinner the belt and the lower heat generation.
From the viewpoint of cost, the minimum number of three strands is selected, and the strand diameter is selected in the range of 0.20 mm to 0.40 mm. One or two of the three strands are shaped in a corrugated or spiral shape at a pitch different from the twisting pitch, and are adjacent in a portion that is a convex portion of the shaping for adjacent strands. It contacts the strands and is spaced apart in the recess to form a rubber entry path. When over-shaped, the shaped wires tend to stretch, and when stress is applied, stress concentrates on unshaped wires that are twisted together to relax and relax the stress. However, the strength of the steel cord decreases. The size of shaping is determined by the reduction of strength, and at least 310 kg / mm 2
Set the shaping conditions so that By doing so, it is possible to prevent an increase in the amount of iron material used due to a decrease in strength, in other words, an increase in cost. If the wire diameter is less than 0.2 mm, the total length of the wire required to give the belt the necessary strength becomes large and the cost increases, and if it exceeds 0.4 mm, the fatigue resistance decreases.

【0009】この発明に使用するスチールコードは撚ピ
ッチと異なるピッチの形付けがされ伸びやすい素線を含
み、各素線が分担する応力は不均一になることが免れず
強度が低下する。そこで、この発明に使用するスチール
コードは鉄材に従来汎用されていたSWRSより炭素含
有量を多くして強度が高くなるようにして強度低下を補
い、炭素添加量増量による靭性低下を、シリコン0.5
〜1.0%、ニッケル0.1%〜0.2%の範囲で添加
し、非金属介在物の大きさを10μm以下にして補った
もである。炭素含有量が0.85%より多くなると靭性
低下を上記方法で補えない。
The steel cord used in the present invention includes strands that are formed with a pitch different from the twist pitch and are easily stretched, and the stresses shared by the strands are unavoidably nonuniform and the strength is reduced. Therefore, the steel cord used in the present invention has a carbon content higher than that of SWRS which has been generally used for iron materials so that the strength is increased to compensate for the strength reduction, and the toughness reduction due to the increase in the carbon addition amount reduces the toughness. 5
.About.1.0% and nickel 0.1% to 0.2% to add non-metallic inclusions to a size of 10 .mu.m or less to compensate. When the carbon content is more than 0.85%, the toughness reduction cannot be compensated by the above method.

【0010】スチールコードを多数の並列して被覆ゴム
をトッピングする際或いはタイヤに組み込んで加硫する
際、スチールコードに張力が作用して素線同士が締め付
けられゴム侵入路を閉る方向に変形する。撚ピッチが短
くコード長手方向に対しての傾斜がきついほどこの作用
が大きく、撚ピッチが15mm未満ではコードの中心の空
間にゴムが十分に充填されず、40mmより長くなると耐
疲労性が許容以上に低下する。
When a large number of steel cords are juxtaposed with the coated rubber or are incorporated into a tire for vulcanization, tension acts on the steel cords to tighten the strands of wire and deform the rubber cord in the direction of closing the rubber entry path. To do. This effect is greater when the twist pitch is shorter and the cord is more inclined with respect to the longitudinal direction. If the twist pitch is less than 15 mm, the space in the center of the cord is not sufficiently filled with rubber. Fall to.

【0011】[0011]

【実施例】この発明の実施例を図面を参照しながら説明
する。図1はこの発明のベルトをを備えたタイヤの右半
裁断面図である。ベルト1は、タイヤ円周方向に対して
ほぼ直角に配列したコードで補強されたカーカス4の外
周部に配置され、タイヤ周方向に対して15〜30の角
度で多数のスチールコード2を1cm当たり5〜10本の
エンド数で配列してゴムに埋設してなるベルトプライ
3、3’の2層をコードの傾斜方向が反対向きになるよ
うに積層してなる。スチールコード2は、スチールコー
ド概念を示した図2に示すように波形または螺旋状5a
に形付けされた1本の素線5と形付けされていない2本
の素線6がピッチPで撚合わされ、コードの中心に形成
される空間7に埋設ゴムを侵入させる間隙8が形成され
る。
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a right half cutaway sectional view of a tire provided with the belt of the present invention. The belt 1 is arranged on the outer peripheral portion of the carcass 4 reinforced by cords arranged substantially at right angles to the tire circumferential direction, and a large number of steel cords 2 per cm at an angle of 15 to 30 with respect to the tire circumferential direction. Two layers of belt plies 3 and 3'arranged in an end number of 5 to 10 and embedded in rubber are laminated so that the inclination directions of the cords are opposite to each other. The steel cord 2 has a corrugated or spiral shape 5a as shown in FIG.
The one shaped wire 5 and the two unshaped wires 6 are twisted at a pitch P, and a gap 8 for allowing the embedded rubber to enter the space 7 formed at the center of the cord is formed. It

【0012】具体例として、径が0.27mmの素線を1
0mmピッチで波形に形付けした素線5と同径の形付けし
ていない2本の素線6を表1に示す撚ピッチで撚合わせ
てスチールコード2にし、このコードをタイヤ円周方向
に対して角度20度、1cm当たり8.7本のエンド数で
配列したベルトプライ2層をコードの傾斜方向が反対向
きになるように積層してベルト2を形成し、サイズ17
5/70R13のグリーンタイヤに組み込んでタイヤを
製造した。
As a concrete example, one wire having a diameter of 0.27 mm
A corrugated wire 5 having a 0 mm pitch and two unshaped wires 6 having the same diameter are twisted at a twist pitch shown in Table 1 into a steel cord 2, which is arranged in the tire circumferential direction. On the other hand, the belt 2 is formed by laminating two layers of the belt ply arranged at an angle of 20 degrees and the number of ends of 8.7 per cm so that the cords are inclined in the opposite directions.
A tire was manufactured by incorporating it into a 5 / 70R13 green tire.

【0013】上記で製造したタイヤを解体してゴムが付
着した状態でスチールコードを取り出し、これを50×
30×30mmのゴムブロックの長手方向に貫通するよう
に埋め込んで試験片を作成し、コードが突き出ているゴ
ムブロックの一方の端を圧力4kg/cm2 の空気源に挿入
し、他端に流量計を接続して60秒間に透過する空気量
を測定して表1に示す。同様にして取りだしたスチール
コードをJIS L1017記載のA法に準じて疲労試
験を行い表1に示す。
The tire manufactured as described above is disassembled, and the steel cord is taken out in a state where the rubber is adhered to the tire, and 50 ×
A test piece is made by embedding it in a 30 × 30 mm rubber block so that it penetrates in the longitudinal direction, and one end of the rubber block from which the cord projects is inserted into an air source with a pressure of 4 kg / cm 2 , and the flow rate at the other end. A meter is connected and the amount of air permeated for 60 seconds is measured and shown in Table 1. A steel cord taken out in the same manner was subjected to a fatigue test in accordance with the method A described in JIS L1017 and is shown in Table 1.

【0014】 表1 タイヤ番号 1 2 3 4 5 6 7 8 炭素含有量(%) 0.82 0.82 0.82 0.82 0.82 0.82 0.82 0.71 撚ピッチ(mm) 5 10 12 15 20 40 60 10 空気透過量(ml/分) 40 38 32 18 0 0 0 37 耐疲労性(指数) 103 100 100 100 98 97 91 103 強度(kg/mm2 ) 328 325 330 326 334 332 330 272 Table 1 Tire No. 1 2 3 4 5 6 7 8 Carbon content (%) 0.82 0.82 0.82 0.82 0.82 0.82 0.82 0.71 Twist pitch (mm) 5 10 12 15 20 40 60 10 Air permeation rate (ml / min) 40 38 32 18 0 0 0 37 Fatigue resistance (index) 103 100 100 100 98 97 91 103 Strength (kg / mm 2 ) 328 325 330 326 334 332 330 272

【0015】撚ピツチが12mm以下のタイヤ番号1、
2、3は空気透過量が多いのでトレッドに貫通傷が生じ
たとき水分がコード内に侵入して発錆する恐れがある。
これに対して撚ピッチが15mm超のタイヤ番号5、6、
7はゴムでコード中心の空間が満たされているので空気
透過が0である。しかし、タイヤ番号7は耐疲労性が劣
り、好ましくない。炭素含有量が0.71%のタイヤ番
号8は強度が低いので必要ベルト強度を出すには多くの
スチールコードを要し、コストが高くなる。なお、撚ピ
ッチ15mmのタイヤ番号4は空気透過はあるが、タイヤ
番号1、2、3に比較して空気透過量が改善されてい
る。
Tire No. 1 having a twist pitch of 12 mm or less,
Since Nos. 2 and 3 have a large amount of air permeation, when the tread has a penetration flaw, moisture may enter the cord and cause rusting.
On the other hand, tire numbers 5, 6 with a twist pitch of more than 15 mm,
No. 7 has no air permeation because the space at the center of the cord is filled with rubber. However, tire number 7 is inferior in fatigue resistance and is not preferable. Tire No. 8 having a carbon content of 0.71% has a low strength, so a large number of steel cords are required to obtain the required belt strength, resulting in a high cost. Although the tire number 4 having a twist pitch of 15 mm has air permeation, the air permeation amount is improved as compared with the tire numbers 1, 2, and 3.

【0016】比較のため、形付けをしていない素線の3
本を撚ピッチ20mmで撚合わせたスチールコードを使用
してエンド数を10.1本/cmに配列した以外は実施例
と同じ条件にしてタイヤを製造し、空気透過量を測定し
て47ml/分の結果を得た。
For comparison, the unshaped wires 3
Tires were manufactured under the same conditions as in the example except that the steel cords twisted at a twist pitch of 20 mm were used and the number of ends was arranged at 10.1 ends / cm, and the air permeation amount was measured to 47 ml / cm. I got a minute result.

【0017】[0017]

【発明の効果】ベルトを形成するスチールコードを炭素
含有量を従来使用されていた鉄材より多くして強度を高
め、撚ピッチとは異なるピッチで波形または螺旋状に形
付けした素線の1本または2本と形付けされていない素
線とを合計3本を撚ピッチ15〜40mmで撚合わせて形
成することによりコードの中心に埋設ゴムを侵入させる
ことができ、ベルトが耐久性を向上させながらコストを
低減して製造できる。
EFFECT OF THE INVENTION One of the strands formed by corrugating or spirally forming a steel cord forming a belt with a carbon content higher than that of a conventionally used iron material so as to increase the strength. Alternatively, by embedding two wires and three unshaped wires by twisting a total of three wires at a twist pitch of 15 to 40 mm, the embedded rubber can penetrate into the center of the cord, which improves the durability of the belt. However, it can be manufactured at a reduced cost.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明のベルトを備えたタイヤの右半裁断面図
てある。
FIG. 1 is a right half cutaway sectional view of a tire provided with a belt of the present invention.

【図2】本発明のベルトを構成するスチールコードの概
念図である。
FIG. 2 is a conceptual diagram of a steel cord that constitutes the belt of the present invention.

【符号の説明】[Explanation of symbols]

1 ベルト 2 スチールコード 3、3’ベルトプライ 5 撚ピッチとは異なるピッチで形付けされた素線 6 形付けされていない素線 1 belt 2 steel cord 3, 3'belt ply 5 strands shaped at a pitch different from the twisting pitch 6 strands not shaped

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ラジアルタイヤのカーカスの外周に配置
され、炭素含有量が0.75〜0.85%の素線の3本
を撚合わせた1×3構造のスチールコードをタイヤ周方
向に対して15〜30度の角度で多数配列して補強した
ベルトプライの複数層を積層してなるラジアルタイヤの
ベルトにおいて、予め撚ピッチと異なるピッチで波形ま
たは螺旋状に形付けされた1本または2本の径が0.2
0〜0.40mmの素線と形付けされていない同径の素線
との合計3本を15〜40mmピッチで撚り合わせてな
り、引張強度が310kg/mm2 以上のスチールコードで
補強されたことを特徴とするするラジアルタイヤのベル
ト。
1. A steel cord having a 1 × 3 structure, which is arranged on the outer periphery of a carcass of a radial tire and is formed by twisting three strands of carbon having a carbon content of 0.75 to 0.85% in the tire circumferential direction. A belt of a radial tire formed by laminating a plurality of layers of belt plies reinforced by arranging a large number at an angle of 15 to 30 degrees, and one or two preliminarily corrugated or spirally shaped at a pitch different from a twist pitch. Book diameter is 0.2
A total of three 0-0.40 mm wires and unshaped wires of the same diameter are twisted together at a pitch of 15-40 mm and reinforced with steel cords with a tensile strength of 310 kg / mm 2 or more. A belt for a radial tire characterized in that
JP6247204A 1994-09-13 1994-09-13 Belt of radial tire Withdrawn JPH0880706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6247204A JPH0880706A (en) 1994-09-13 1994-09-13 Belt of radial tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6247204A JPH0880706A (en) 1994-09-13 1994-09-13 Belt of radial tire

Publications (1)

Publication Number Publication Date
JPH0880706A true JPH0880706A (en) 1996-03-26

Family

ID=17160004

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6247204A Withdrawn JPH0880706A (en) 1994-09-13 1994-09-13 Belt of radial tire

Country Status (1)

Country Link
JP (1) JPH0880706A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11192810A (en) * 1997-12-29 1999-07-21 Bridgestone Metalpha Kk Rubber article reinforcing structure and pneumatic radial tire therewith
JP2000190708A (en) * 1998-12-25 2000-07-11 Yokohama Rubber Co Ltd:The Pneumatic radial tire for passenger car
US20180147889A1 (en) * 2015-05-21 2018-05-31 Bridgestone Corporation Pneumatic tire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11192810A (en) * 1997-12-29 1999-07-21 Bridgestone Metalpha Kk Rubber article reinforcing structure and pneumatic radial tire therewith
JP2000190708A (en) * 1998-12-25 2000-07-11 Yokohama Rubber Co Ltd:The Pneumatic radial tire for passenger car
US20180147889A1 (en) * 2015-05-21 2018-05-31 Bridgestone Corporation Pneumatic tire

Similar Documents

Publication Publication Date Title
US4219601A (en) Rubber reinforcing member and a method of manufacturing the same
AU593070B2 (en) Reinforced composite structure
EP2218588A1 (en) Motorcycle tire and method for manufacturing the same
JPH0331601B2 (en)
KR20020063611A (en) Multilayer steel cable for a tyre carcass
JP2001322404A (en) Pneumatic radial tire
JPH08276705A (en) Tire with reinforced belt-band
US20100218872A1 (en) Rubber-steel cord composite and tire using the same
JP2001512191A (en) Steel cord for pneumatic tire protection ply
EP3603995B1 (en) Pneumatic tire
JPS59124404A (en) Pneumatic radial tire
US7438104B2 (en) Radial tire
US4749016A (en) Radial tire having an improving durability
JPH0880706A (en) Belt of radial tire
JPS6358441B2 (en)
JP2995709B2 (en) Steel cord for belt reinforcement of pneumatic tires for heavy loads
JP2001000033U (en) High tension cord
JP4080564B2 (en) Metal cord for elastomer reinforcement
JPH06143914A (en) Pneumatic radial tire
JPH044162B2 (en)
JP4259652B2 (en) Steel cord for tire reinforcement
JP4248007B2 (en) Steel cord for tire reinforcement
JP2597836Y2 (en) Steel cord for reinforcing rubber products
JP2964262B2 (en) Pneumatic radial tires for passenger cars
JPH09142104A (en) Pneumatic tire for passenger car

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20011120