JP3789174B2 - Steel cord for reinforcing small truck tires - Google Patents
Steel cord for reinforcing small truck tires Download PDFInfo
- Publication number
- JP3789174B2 JP3789174B2 JP20693296A JP20693296A JP3789174B2 JP 3789174 B2 JP3789174 B2 JP 3789174B2 JP 20693296 A JP20693296 A JP 20693296A JP 20693296 A JP20693296 A JP 20693296A JP 3789174 B2 JP3789174 B2 JP 3789174B2
- Authority
- JP
- Japan
- Prior art keywords
- filament
- sheath
- cord
- core
- spiral
- 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.)
- Expired - Fee Related
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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
- 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
- D07B2201/2024—Strands twisted
- D07B2201/2029—Open winding
- D07B2201/2031—Different twist pitch
- D07B2201/2032—Different twist pitch compared with the 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
- D07B2201/2095—Auxiliary components, e.g. electric conductors or light guides
- D07B2201/2097—Binding wires
Landscapes
- Ropes Or Cables (AREA)
- Tires In General (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、小型トラックタイヤ補強用スチールコードに関する。
【０００２】
【従来の技術】
従来トラック、バス用の大型タイヤに用いられるスチールコードにおいては、中心のコアフィラメント３本、その周りにらせん状に巻きつけられたシースフィラメント９本、最外層のスパイラルフィラメント１本の所謂３＋９＋１構造であって、フィラメントの抗張力が２８０〜３００ｋｇｆ／ｍｍ2であり、且つフィラメント径が０．２２〜０．２３ｍｍのものがよく知られている。
このような３＋９×０．２３＋１構造のコードを小型トラック用タイヤに適用した場合、適当なコード打ち込み間隔を得ようとすると、カーカス強度が過剰で、タイヤ重量も増加し、転がり抵抗も増加し、燃費も悪い。
これに対して、適当なカーカス強度を得ようとすると、コード打ち込み間隙が広くなり、内圧によりコードがタイヤ内面に浮き出し、接着性が著しく低下する。
このようにコード打ち込み間隔とカーカス強度の両者を両立できない難点があった。
【０００３】
【発明が解決しようとする課題】
本発明の目的は小型トラック用タイヤ補強用スチールコードとして、適正なカーカス強度及び適当なコード間隔を保持両立させ、タイヤ重量を低減し、耐久性の維持向上を実現することである。
【０００４】
【課題を解決するための手段】
本発明は、抗張力３２０〜３６０ｋｇｆ／ｍｍ２、フィラメント径０．１７〜０．１８ｍｍの範囲にあるフィラメントを３＋９＋１構造に撚り合わせて使用することによって前記の課題を解決した。
即ち、抗張力３２０〜３６０ｋｇｆ／ｍｍ２、フィラメント径０．１７〜０．１８ｍｍの範囲のフィラメント３本を撚り合わせたコアフィラメントと、その周囲にらせん状に巻き付けられた９本のシースフィラメント及び最外層の１本のスパイラルフィラメントよりなり、コアフィラメントとシースフィラメントは同一撚り方向で且つ異ピッチとし、スパイラルフィラメントのみシースフィラメントと逆撚りとする。
コアフィラメントとシースフィラメントは同一線径のフィラメントを使用する。
【０００５】
このタイヤ補強用スチールコードをタイヤに適用するに当っては、クラウンセンターライン部のコード打ち込み間隔を、スパイラルを除き２．１ｍｍ以下とし、ビード折り返し部分のコード打ち込み間隔を０．８ｍｍ以上にすることによって小型トラック用タイヤに適したタイヤ重量、転がり抵抗、燃費とすることができ、接着性、ビード部耐久性（プライ端セパレーション性）も維持できる。
【０００６】
【発明の実施の形態】
本発明においては、コアフィラメントとシースフィラメントは同一方向撚りで、且つ異ピッチとする。この両フィラメントの撚りを異方向とすると、両者間の接触圧が高く、両者のこすれ合いに伴う摩耗即ちフレッティング摩耗が発生し、コード強力の低下が著しくなる。
また撚り方向を同一にしても、ピッチを同じとすると、コアとコアの隙間にシースフィラメントが落ち込むことになり、コード外形が多角形（６角形）となり、スパイラルフィラメントとの接触が不均一になり、フレッティング摩耗を促進することになる。
【０００７】
コアフィラメントとシースフィラメントの型付け率を９０〜１０５％の範囲でほぼ等しくする。９０％以下の場合、コアとシース間の接触圧が高く、強力の低下が著しい。又１０５％以上の場合には、今度はシースとスパイラル間の接触圧が高く、これ又強力の低下が著しくなる。
【０００８】
全フィラメントの抗張力を３２０〜３６０ｋｇｆ／ｍｍ２の間、好ましくは３３０ｋｇｆ／ｍｍ２前後とする。３２０ｋｇｆ／ｍｍ２未満の場合、同一ケース強度を保つには、打ち込み本数を増やすか、線径を太くするかしなければならず、タイヤ耐久性が低下したり、重量が増加したりする。
逆に４００ｋｇｆ／ｍｍ２超の場合、現在のスチールコードの製造方法では、フィラメントの伸線工程での断線が多発し、実用的でなくなる。
【０００９】
コアフィラメントとシースフィラメントのフィラメント径を０．１７０〜０．１８０ｍｍの間、好ましくは０．１７５ｍｍ前後とする。
０．１７０ｍｍ未満の場合、同一ケース強度を保つには、より多数本のフィラメントを撚り合わせるか、打ち込み本数をふやさなければならず、タイヤ耐久性の低下、製造コストアップにつながる。
逆に０．１８０ｍｍ超の場合、タイヤ転動時のサイド部曲げ変形による繰り返し疲労性が著しく低下する。
【００１０】
このスチールコードをタイヤに組み込むに当って、クラウンセンター部のコード打ち込み間隔を２．１ｍｍ以下とする。
このコード打ち込み間隔を２．１ｍｍ超とすると、タイヤ内圧により、ショルダー部のコードを覆うゴムゲージが薄くなり、コードがアバラ骨状にうき出す現象（ワッシュブレット）が発生し、コードとゴムとの接着性が著しく低下するためセパレーション故障が起き易くなる。
ビード折り返し部分のコード打ち込み間隔は０．８ｍｍ以上とする。このコード打ち込み間隔を０．８ｍｍ未満とすると、プライエンド部のコード間隔が狭くなり、タイヤ転動時の剪断歪により発生した亀裂がつながり易くビード部の耐セパレーション性が悪化する。
【００１１】
このように本発明は、抗張力３２０〜３６０ｋｇｆ／ｍｍ２、フィラメント径０．１７〜０．１８ｍｍの範囲にあるフィラメントを３＋９＋１構造に撚り合わせて使用することで、適正なカーカス強度及びコード間隔を保ち、タイヤ重量の低減と、耐久性の維持向上を実現している。
また、このコードの適用において、フィラメント単位断面積あたりにかかる内圧による張力の増加によって、耐フレッティング摩耗性の低下が懸念されるが、本発明においては、前記した如く、コアとシースの型付け率を最適化することによって、このコードの適用を実現している。
【００１２】
【実施例】
以下に実施例によって、本発明を更に具体的に説明するが、本発明はこの実施例によって何等限定されるものではない。
タイヤ幅７．５０インチ、リム径１６インチのラジアルタイヤ（７．５０Ｒ１６）のカーカスプライに本発明を適用して、出来たタイヤについて
フレッティング量、プライ端セパレーション性、ワッシュブレット性（Ｗ／Ｂ性）を次の測定方法により測定して、評価した。
【００１３】
（１）フレッティング量
１００，０００ｋｍの実地走行後のタイヤからカーカスコードを取り出し、そのコードを熱硬化性樹脂に封入後硬化させてサンプルを作製した。そのサンプルを１ｍｍ毎に研磨機でバフし、３５個のコード断面写真を撮影して、その写真から各シースフィラメントのフレッティング深さを測定し、各シースフィラメントの最大フレッティング深さの平均値を求めて、そのコードのフレッティング量とした。比較例１を１００とする指数で表示した。数値が小さい程、耐フレッティング摩耗性に優れる。
【００１４】
（２）プライ端セパレーション性
実地で良路を１００，０００ｋｍ走行後のタイヤを解剖してプライ端を出し、タイヤ周上４ケ所について、それぞれコード１０本の両端８０ケ所を調べ、この中で亀裂がつながっている数の割合を亀裂つながり率として求め、この値を比較例１を１００とする指数で示す。
【００１５】
（３）Ｗ／Ｂ性
１００，０００ｋｍの実地走行後のタイヤから試験用サンプルを切り出し、更に剥離テストを行うために、スチールコードを引き起し、その起こしたコードと、残りの部分とを、夫々上下のチャック間に固定し、インストロン又はテンシロンタイプの引張試験機で引張速度が５０±５ｍｍ／分の条件で剥離し、コード上に残ったゴム付着量を評価した。
Ａ ９０％以上 ゴム付着
Ｂ ７５〜９０％ 〃
Ｃ ５０〜７５％ 〃
Ｄ ２５〜５０％ 〃
Ｅ ０〜２５％ 〃
以上５段階で評価した。
【００１６】
各タイヤのタイヤ補強用スチールコードの特性と、フレッティング量、プライ端セパレーション性、Ｗ／Ｂ性の評価結果を表１に示す。
【００１７】
【表１】
【発明の効果】
本発明によれば、フレッティング摩耗が減少し、プライ端セパレーション性が少なく、ワッシュブレット（Ｗ／Ｂ）発生が少なく、コードとゴムとの接着性が高い小型トラック用タイヤ補強用スチールコードが提供される。従って、本発明の小型トラック用タイヤ補強用スチールコードは、適正なカーカス強度と適正なコード間隔を保持両立させ、タイヤ重量を低減し、耐久性を維持向上させることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel cord for reinforcing a small truck tire.
[0002]
[Prior art]
Conventional steel cords used for large tires for trucks and buses have a so-called 3 + 9 + 1 structure with three core filaments in the center, nine sheath filaments wound spirally around it, and one spiral filament on the outermost layer. It is well known that the filament has a tensile strength of 280 to 300 kgf / mm 2 and a filament diameter of 0.22 to 0.23 mm.
When such a 3 + 9 × 0.23 + 1 structure cord is applied to a light truck tire, when trying to obtain an appropriate cord driving distance, the carcass strength is excessive, the tire weight increases, the rolling resistance also increases, Fuel consumption is also bad.
On the other hand, when an appropriate carcass strength is obtained, the cord driving gap is widened, and the cord is raised on the inner surface of the tire due to the internal pressure, so that the adhesiveness is remarkably lowered.
As described above, there is a problem that it is impossible to achieve both the cord driving interval and the carcass strength.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to maintain and maintain an appropriate carcass strength and an appropriate cord interval as a steel cord for reinforcing a tire for a light truck, to reduce the tire weight, and to realize maintenance improvement of durability.
[0004]
[Means for Solving the Problems]
The present invention has solved the above-mentioned problems by using a filament having a tensile strength of 320 to 360 kgf / mm 2 and a filament diameter of 0.17 to 0.18 mm twisted into a 3 + 9 + 1 structure.
That is, a core filament obtained by twisting three filaments having a tensile strength of 320 to 360 kgf / mm 2 and a filament diameter of 0.17 to 0.18 mm, nine sheath filaments wound around the periphery, and an outermost layer The core filament and the sheath filament have the same twist direction and different pitches, and only the spiral filament is reversely twisted with the sheath filament.
The core filament and the sheath filament use filaments having the same wire diameter.
[0005]
When this tire reinforcing steel cord is applied to a tire, the cord driving interval of the crown center line portion is 2.1 mm or less excluding the spiral, and the cord driving interval of the bead folded portion is 0.8 mm or more. Thus, the tire weight, rolling resistance, and fuel consumption suitable for light truck tires can be achieved, and adhesion and bead durability (ply end separation) can also be maintained.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the core filament and the sheath filament are twisted in the same direction and have different pitches. When the filaments are twisted in different directions, the contact pressure between the two is high, wear due to rubbing between them, that is, fretting wear occurs, and the cord strength is significantly reduced.
Even if the twist direction is the same, if the pitch is the same, the sheath filament falls into the gap between the cores, the outer shape of the cord becomes a polygon (hexagon), and the contact with the spiral filament becomes uneven. Will promote fretting wear.
[0007]
The molding rate of the core filament and the sheath filament is made substantially equal in the range of 90 to 105%. In the case of 90% or less, the contact pressure between the core and the sheath is high, and the decrease in strength is remarkable. On the other hand, if it is 105% or more, the contact pressure between the sheath and the spiral is high this time, and the decrease in strength becomes significant.
[0008]
The tensile strength of all filaments is between 320 and 360 kgf / mm 2 , preferably around 330 kgf / mm 2 . In the case of less than 320 kgf / mm 2 , in order to maintain the same case strength, the number of driving must be increased or the wire diameter must be increased, resulting in a decrease in tire durability and an increase in weight.
On the other hand, if it exceeds 400 kgf / mm 2 , the current steel cord manufacturing method frequently causes breakage in the filament drawing process and becomes impractical.
[0009]
The filament diameter of the core filament and the sheath filament is between 0.170 and 0.180 mm, preferably around 0.175 mm.
In the case of less than 0.170 mm, in order to maintain the same case strength, it is necessary to twist a larger number of filaments or increase the number of driven filaments, leading to a decrease in tire durability and an increase in manufacturing cost.
On the other hand, when it exceeds 0.180 mm, repeated fatigue due to side portion bending deformation during rolling of the tire is remarkably lowered.
[0010]
When this steel cord is incorporated into a tire, the cord driving distance of the crown center portion is set to 2.1 mm or less.
If this cord driving interval is over 2.1 mm, the rubber gauge that covers the shoulder cord becomes thin due to the tire internal pressure, and a phenomenon in which the cord is exposed in a rib shape (wash bullet) occurs, and the cord and rubber are bonded. As a result, separation failure is likely to occur.
The cord driving interval at the bead folding portion is 0.8 mm or more. When the cord driving interval is less than 0.8 mm, the cord interval at the ply end portion is narrowed, and cracks caused by shear strain at the time of tire rolling are easily connected and the separation resistance of the bead portion is deteriorated.
[0011]
As described above, the present invention maintains an appropriate carcass strength and cord spacing by twisting a filament having a tensile strength of 320 to 360 kgf / mm 2 and a filament diameter of 0.17 to 0.18 mm into a 3 + 9 + 1 structure. The tire weight has been reduced and the durability has been improved.
In addition, in the application of this cord, there is a concern that the resistance to fretting wear may be reduced due to an increase in tension due to the internal pressure per unit cross-sectional area of the filament. This code can be applied by optimizing.
[0012]
【Example】
The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to the examples.
By applying the present invention to a carcass ply of a radial tire (7.50R16) having a tire width of 7.50 inches and a rim diameter of 16 inches, the resulting tire has fretting amount, ply end separation, and wash bullet (W / B) Was measured and evaluated by the following measuring method.
[0013]
(1) A carcass cord was taken out from a tire after actual running with a fretting amount of 100,000 km, and the cord was sealed in a thermosetting resin and cured to prepare a sample. The sample was buffed every 1 mm with a polishing machine, 35 cord cross-section photographs were taken, the fretting depth of each sheath filament was measured from the photograph, and the average value of the maximum fretting depth of each sheath filament. Was determined as the fretting amount of the cord. Comparative Example 1 is indicated by an index of 100. The smaller the value, the better the fretting wear resistance.
[0014]
(2) Disassembling the tire after running 100,000 km on a good road in a ply end separation property, ply ends are taken out, and 80 points on both ends of 10 cords are examined for each of four locations on the tire circumference, and cracks are found in this The ratio of the number of connected to each other is obtained as a crack connection ratio, and this value is indicated by an index with Comparative Example 1 being 100.
[0015]
(3) A test sample was cut out from a tire after actual running with a W / B property of 100,000 km, and a steel cord was raised in order to perform a peel test, and the raised cord and the remaining portion were Each was fixed between upper and lower chucks, and peeled off with an Instron or Tensilon type tensile tester under the condition of a tensile speed of 50 ± 5 mm / min, and the amount of rubber remaining on the cord was evaluated.
A 90% or more Rubber adhesion B 75-90% 〃
C 50-75% 〃
D 25-50% 〃
E 0-25% 〃
Evaluation was made in the above five stages.
[0016]
Table 1 shows the characteristics of the steel cord for tire reinforcement of each tire, and the evaluation results of the fretting amount, ply end separation property, and W / B property.
[0017]
[Table 1]
【The invention's effect】
According to the present invention, there is provided a steel cord for reinforcing a tire for a small truck with reduced fretting wear, low ply end separation, low occurrence of wash bullets (W / B), and high adhesion between the cord and rubber. Is done. Therefore, the steel cord for reinforcing a tire for a light truck according to the present invention can maintain and maintain an appropriate carcass strength and an appropriate cord interval, reduce tire weight, and maintain and improve durability.
Claims (3)
上記スパイラルフィラメントを除く、フィラメントの抗張力を３２０〜３６０ｋｇｆ／ｍｍ２の範囲にすると共に、コアフィラメントとシースフィラメントの径を０．１７０ｍｍ〜０．１８０ｍｍの範囲としたことを特徴とする小型トラックタイヤ補強用スチールコード。It consists of three twisted core filaments, 9 sheath filaments wound spirally around it, and one spiral filament in the outermost layer. The core filament and the sheath filament have the same twist direction and different pitches. In addition, only the spiral filament is reversely twisted with the sheath filament, and the core filament and the sheath filament are used for tire reinforcing steel cords using filaments of the same wire diameter.
Reinforcement of small truck tires, characterized in that the tensile strength of the filament, excluding the spiral filament, is in the range of 320 to 360 kgf / mm 2 and the diameter of the core filament and the sheath filament is in the range of 0.170 mm to 0.180 mm. Steel cord.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20693296A JP3789174B2 (en) | 1996-08-06 | 1996-08-06 | Steel cord for reinforcing small truck tires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20693296A JP3789174B2 (en) | 1996-08-06 | 1996-08-06 | Steel cord for reinforcing small truck tires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1053979A JPH1053979A (en) | 1998-02-24 |
| JP3789174B2 true JP3789174B2 (en) | 2006-06-21 |
Family
ID=16531440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20693296A Expired - Fee Related JP3789174B2 (en) | 1996-08-06 | 1996-08-06 | Steel cord for reinforcing small truck tires |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3789174B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5258108B2 (en) * | 2009-04-27 | 2013-08-07 | 株式会社ブリヂストン | Pneumatic radial tire |
| JP5435775B2 (en) * | 2009-04-30 | 2014-03-05 | 株式会社ブリヂストン | Steel cord and pneumatic radial tire |
| JP5506487B2 (en) * | 2010-03-24 | 2014-05-28 | 株式会社ブリヂストン | Steel cord and pneumatic radial tire using the same |
-
1996
- 1996-08-06 JP JP20693296A patent/JP3789174B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1053979A (en) | 1998-02-24 |
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