JP2008150757A - Rubber article-reinforcing steel cord and pneumatic tire - Google Patents

Rubber article-reinforcing steel cord and pneumatic tire Download PDF

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JP2008150757A
JP2008150757A JP2006342609A JP2006342609A JP2008150757A JP 2008150757 A JP2008150757 A JP 2008150757A JP 2006342609 A JP2006342609 A JP 2006342609A JP 2006342609 A JP2006342609 A JP 2006342609A JP 2008150757 A JP2008150757 A JP 2008150757A
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cord
core strand
steel cord
layer
filament
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JP5036294B2 (en
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Hideki Masubuchi
英樹 増渕
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Bridgestone Corp
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Bridgestone Corp
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    • 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
    • D07B1/0613—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the rope 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
    • 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
    • D07B1/0633—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration having a multiple-layer 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
    • D07B2201/2036—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
    • D07B2201/2036—Strands characterised by the use of different wires or filaments
    • D07B2201/2037—Strands characterised by the use of different wires or filaments regarding the dimension of the 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
    • D07B2201/2047—Cores
    • D07B2201/2051—Cores characterised by a value or range of the dimension given
    • 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
    • D07B2201/2066—Cores characterised by the materials used
    • 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
    • D07B2201/2067—Cores characterised by the elongation or tension behaviour

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  • Ropes Or Cables (AREA)
  • Tires In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber article-reinforcing steel cord in which cord tensile strength after vulcanization is improved without lowering cord strength per cord cross section, and a pneumatic tire using the same. <P>SOLUTION: The rubber article-reinforcing steel cord has a double twisted structure formed by twisting a sheath strand 2 having a twisted structure with two or more layers around a core strand 1 having a twisted structure with two or more layers. In the steel cord, the tensile strength of the outermost layer of a sheath filament 11 constituting the core strand 1 is ≤3,100 N/mm<SP>2</SP>and the tensile strength of all filaments excluding the outermost layer of the sheath filament 11 is ≥3,150 N/mm<SP>2</SP>. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明はゴム物品補強用スチールコードおよび空気入りタイヤ（以下、単に「スチールコード」および「タイヤ」とも称する）に関し、詳しくは、タイヤや工業用ベルト等の各種ゴム物品の補強材として使用されるゴム物品補強用スチールコード、およびそれを用いた空気入りタイヤに関する。   TECHNICAL FIELD The present invention relates to a steel cord for reinforcing rubber articles and a pneumatic tire (hereinafter also simply referred to as “steel cord” and “tire”), and more specifically, used as a reinforcing material for various rubber articles such as tires and industrial belts. The present invention relates to a steel cord for reinforcing rubber articles and a pneumatic tire using the same.

一般に、建設車両用タイヤは、荒れた地表上で重い負荷の下に使用されることが多いため、カーカスやベルト層などの各補強層に使用するスチールコードには、高い引張り強さ（切断荷重）が求められる。このため、複数本のフィラメントを撚り合わせてなるストランドをさらに撚り合わせた、いわゆる複撚り構造のスチールコードとして、１本のコアストランドの周りに複数本のシースストランドを撚り合わせた、例えば、７×（３＋９）構造や７×（３＋９＋１５）構造などのスチールコードが用いられている。   In general, tires for construction vehicles are often used on rough surfaces and under heavy loads, so steel cords used for each reinforcing layer such as carcass and belt layer have high tensile strength (cutting load). ) Is required. For this reason, as a steel cord having a so-called double twist structure in which strands formed by twisting a plurality of filaments are further twisted, a plurality of sheath strands are twisted around one core strand, for example, 7 × Steel cords such as a (3 + 9) structure or a 7 × (3 + 9 + 15) structure are used.

しかし、複数本のフィラメントを撚り合わせた複撚りコードでは、張力負担時にコアストランドとシースストランドの最外層シースフィラメント同士が先行的にせん断破壊され、個々のフィラメントの引張り強力の上昇の分だけコード強力が向上しないという問題があった。これに対し、特許文献１では、各ストランドの最外層フィラメントの抗張力を低く抑えることによりせん断による先行破断を回避することで、コードの高強力を確保する手法が開示されている。   However, in a double twisted cord in which a plurality of filaments are twisted together, the outermost sheath filaments of the core strand and the sheath strand are preliminarily sheared when tension is applied, and the cord strength is increased by the increase in the tensile strength of each filament. There was a problem that did not improve. On the other hand, Patent Document 1 discloses a technique for ensuring high strength of a cord by avoiding preceding breakage due to shear by keeping the tensile strength of the outermost layer filament of each strand low.

また、複数本のフィラメントを撚り合わせた複撚りコードでは、フィラメントの強力の総和に比べて、撚り角に起因した減少のみでは説明できないほどコード強力が低下して問題となっていたが、これに対しては、最外層シースを構成するフィラメントをその内側の層を構成するフィラメントよりも太径とすることで、一部のフィラメントの先行破断を回避して、コード軸方向の強力の低下を抑制する手法が開示されている（特許文献２）。
特開平１１−２１７７５号公報（特許請求の範囲等） 国際公開０１／０３４９００号パンフレット（特許請求の範囲等） In addition, in the case of a double twisted cord in which a plurality of filaments are twisted together, the strength of the cord is lower than the sum of the strength of the filaments. On the other hand, the filament constituting the outermost layer sheath has a larger diameter than the filament constituting the inner layer, thereby avoiding the pre-breaking of some filaments and suppressing the decrease in strength in the cord axis direction. (Patent Document 2).
JP 11-21775 A (Claims etc.) WO 01/034900 pamphlet (claims, etc.)

しかしながら、上記特許文献１に記載の技術では、フィラメントの抗張力を高めた分の強力向上は望めるものの、全ての最外層シースフィラメントの抗張力を低くすることから、コード断面積当りのコード引張り強力を高く望めないという問題があった。また、特許文献２に記載の技術では、コード断面積当りのコード強力を高めることは可能であるものの、タイヤ加硫時の熱により、やはり高いコード引張り強力を望むことは困難であった。   However, although the technique described in Patent Document 1 can improve the strength by increasing the tensile strength of the filament, it lowers the tensile strength of all outermost sheath filaments, and therefore increases the tensile strength of the cord per cross-sectional area of the cord. There was a problem that I could not hope. Further, with the technology described in Patent Document 2, although it is possible to increase the cord strength per cross-sectional area of the cord, it is difficult to desire a high cord tensile strength due to the heat during tire vulcanization.

そこで、本発明の目的は、コード断面積当りのコード強力を低下させることなく、かつ、加硫後のコード引張り強力を向上させたゴム物品補強用スチールコードおよびそれを用いた空気入りタイヤを提供することにある。   Accordingly, an object of the present invention is to provide a steel cord for reinforcing rubber articles and a pneumatic tire using the same, without reducing the cord strength per cross-sectional area of the cord and improving the cord tensile strength after vulcanization. There is to do.

本発明者は鋭意検討した結果、下記構成とすることにより、撚り線後および加硫後のいずれにおいてもコード断面積当りのコード強力を確保することが可能となることを見出し て、本発明を完成するに至った。   As a result of intensive studies, the present inventor has found that the following configuration makes it possible to secure the cord strength per cross-sectional area of the cord both after stranded wire and after vulcanization. It came to be completed.

即ち、本発明のゴム物品補強用スチールコードは、２層以上の層撚り構造を有するコアストランドの周りに、２層以上の層撚り構造を有するシースストランドを撚り合わせた複撚り構造のゴム物品補強用スチールコードにおいて、前記コアストランドを構成する最外層シースフィラメントの抗張力が３１００Ｎ／ｍｍ２以下であり、かつ、コードを構成するフィラメントのうち、該最外層シースフィラメントを除く全フィラメントの抗張力が、３１５０Ｎ／ｍｍ２以上であることを特徴とするものである。 That is, the steel cord for reinforcing rubber articles of the present invention is reinforced with a rubber article having a double twist structure in which a sheath strand having a layer twist structure of two or more layers is twisted around a core strand having a twist structure of two or more layers. In the steel cord for use, the tensile strength of the outermost layer sheath filament constituting the core strand is 3100 N / mm 2 or less, and among the filaments constituting the cord, the tensile strength of all the filaments excluding the outermost layer sheath filament is 3150 N / Mm 2 or more.

本発明においては、少なくとも前記コアストランドにおいて、各層を構成するフィラメントが、その内側の層を構成するフィラメントよりも太径であることが好ましい。また、前記コアストランドが２層の層撚り構造を有する場合、該コアストランドの外接円の面積に対する該コアストランドの最外層シースフィラメントの断面積の総和の比が０．５３以上であることが好ましく、前記コアストランドが３層の層撚り構造を有する場合には、該コアストランドの外接円の面積に対する該コアストランドの最外層シースフィラメントの断面積の総和の比が０．４３以上であることが好ましい。   In the present invention, at least in the core strand, it is preferable that the filament constituting each layer has a larger diameter than the filament constituting the inner layer. When the core strand has a two-layer twisted structure, the ratio of the sum of the cross-sectional areas of the outermost sheath filaments of the core strand to the area of the circumscribed circle of the core strand is preferably 0.53 or more. When the core strand has a three-layer twist structure, the ratio of the sum of the cross-sectional areas of the outermost sheath filaments of the core strand to the area of the circumscribed circle of the core strand is 0.43 or more. preferable.

また、本発明の空気入りタイヤは、一対のビード部間でトロイド状に延びるカーカスを骨格とし、該カーカスのクラウン部をベルト層で補強してなる空気入りタイヤであって、該カーカスまたはベルト層に、上記本発明のゴム物品補強用スチールコードを用いたことを特徴とするものである。   Further, the pneumatic tire of the present invention is a pneumatic tire in which a carcass extending in a toroidal shape between a pair of bead portions is used as a skeleton, and a crown portion of the carcass is reinforced with a belt layer, and the carcass or the belt layer Moreover, the steel cord for reinforcing rubber articles according to the present invention is used.

本発明によれば、上記構成としたことにより、コード断面積当りのコード強力を低下させることなく、かつ、加硫後のコード引張り強力を向上させたゴム物品補強用スチールコードおよびそれを用いた空気入りタイヤを実現することが可能となった。   According to the present invention, the steel cord for reinforcing a rubber article and the cord tension strength after vulcanization are improved without reducing the cord strength per cord cross-sectional area and using the above configuration, and the same. It became possible to realize a pneumatic tire.

以下、本発明の好適な実施の形態について詳細に説明する。
本発明は、２層以上の層撚り構造を有するコアストランドの周りに、２層以上の層撚り構造を有するシースストランドを撚り合わせた複撚り構造のスチールコードに関するものである。 Hereinafter, preferred embodiments of the present invention will be described in detail.
The present invention relates to a steel cord having a double twist structure in which a sheath strand having a layer twist structure of two or more layers is twisted around a core strand having a layer twist structure of two or more layers.

図１に、本発明のスチールコードの一例の断面図を示す。図示するスチールコードは、３層の層撚り構造を有するコアストランド１の周りに、３層の層撚り構造を有する６本のシースストランド２が撚り合わされてなる。本発明においては、かかるコアストランド１を構成する最外層シースフィラメント１１（図中の斜線部）の抗張力が３１００Ｎ／ｍｍ２以下であり、かつ、コードを構成するフィラメントのうち、最外層シースフィラメント１１を除く全フィラメントの抗張力が３１５０Ｎ／ｍｍ２以上であることが重要である。 In FIG. 1, sectional drawing of an example of the steel cord of this invention is shown. The illustrated steel cord is obtained by twisting six sheath strands 2 having a three-layer twist structure around a core strand 1 having a three-layer twist structure. In the present invention, the outermost layer sheath filament 11 (shaded portion in the figure) constituting the core strand 1 has a tensile strength of 3100 N / mm 2 or less, and among the filaments constituting the cord, the outermost layer sheath filament 11 It is important that the tensile strength of all filaments except 3 is 3150 N / mm 2 or more.

コアストランド１を構成する最外層フィラメント１１の抗張力が３１００Ｎ／ｍｍ２を超えると、ゴム物品加硫時の熱により、最外層シースフィラメント１１がせん断力により先行破断してしまい、フィラメント抗張力の向上分に相当するコード強力を得ることが困難となる。かかる最外層シースフィラメント１１の抗張力は、好ましくは２５００〜２９００Ｎ／ｍｍ２、より好ましくは２６００〜２９００Ｎ／ｍｍ２である。また、この最外層シースフィラメント１１以外のコードを構成するフィラメントの抗張力が３１５０Ｎ／ｍｍ２未満であると、コード断面積当りのフィラメント強力の総和が低く、所定のコード引張り強力を得にくくなる。最外層シースフィラメント１１以外のフィラメントの抗張力は、好ましくは３１５０〜３６００Ｎ／ｍｍ２、より好ましくは３２００〜３６００Ｎ／ｍｍ２である。 When the tensile strength of the outermost layer filament 11 constituting the core strand 1 exceeds 3100 N / mm 2 , the outermost layer sheath filament 11 is preliminarily broken by the shearing force due to heat at the time of rubber article vulcanization, and the filament tensile strength is improved. It becomes difficult to obtain code strength equivalent to. The tensile strength of the outermost sheath filament 11 is preferably 2500 to 2900 N / mm 2 , more preferably 2600 to 2900 N / mm 2 . If the tensile strength of the filaments constituting the cord other than the outermost sheath filament 11 is less than 3150 N / mm 2 , the total filament strength per cord cross-sectional area is low, making it difficult to obtain a predetermined cord tensile strength. The tensile strength of the filaments other than the outermost sheath filament 11 is preferably 3150 to 3600 N / mm 2 , more preferably 3200 to 3600 N / mm 2 .

また、本発明においては、少なくともコアストランド１において、各層を構成するフィラメントを、その内側の層を構成するフィラメントよりも太径とすることが好ましい。例えば、図示する例では、最外層シースフィラメント１１を、その内側の層を構成する内層シースフィラメントよりも太径とする。なお、図中の符号１３はコアフィラメントを意味する。本発明においては、具体的なフィラメント径については特に制限されるものではなく、所望に応じ、用途等に応じて適宜設定することが可能である。   In the present invention, at least in the core strand 1, it is preferable that the filament constituting each layer has a larger diameter than the filament constituting the inner layer. For example, in the illustrated example, the outermost sheath filament 11 has a larger diameter than the inner sheath filament constituting the inner layer. In addition, the code | symbol 13 in a figure means a core filament. In the present invention, the specific filament diameter is not particularly limited, and can be set as appropriate according to the application and the like as desired.

また、コアストランド１が２層の層撚り構造を有する場合には、その外接円の面積に対する最外層シースフィラメント１１の断面積の総和の比が０．５３以上、特には０．５５〜０．７０、さらには０．５５〜０．６０であることが好ましい。この比が０．５３未満であると、コアストランド１１の最外層シースフィラメント１がせん断力により先行破断してしまい、やはり所定のコード引張り強力が得にくくなる。   Further, when the core strand 1 has a two-layer twisted structure, the ratio of the total cross-sectional area of the outermost sheath filament 11 to the area of the circumscribed circle is 0.53 or more, particularly 0.55 to 0.00. 70, more preferably 0.55 to 0.60. If this ratio is less than 0.53, the outermost sheath filament 1 of the core strand 11 is preliminarily broken by a shearing force, and it becomes difficult to obtain a predetermined cord tensile strength.

さらに、コアストランド１が３層撚り以上の層撚り構造を有する場合には、その外接円の面積に対する最外層シースフィラメント１１の断面積の総和の比が０．４３以上、特には０．４３〜０．６０、さらには０．４５〜０．５０であることが好ましい。この比が、０．４３未満であると、コアストランド１の最外層シースフィラメントがせん断力により先行破断してしまい、やはり所定のコード引張り強力が得にくくなる。   Furthermore, when the core strand 1 has a layer twist structure of three layers or more, the ratio of the total cross-sectional area of the outermost sheath filament 11 to the area of the circumscribed circle is 0.43 or more, particularly 0.43 to It is preferably 0.60, more preferably 0.45 to 0.50. When this ratio is less than 0.43, the outermost layer sheath filament of the core strand 1 is preliminarily broken by a shearing force, and it becomes difficult to obtain a predetermined cord tensile strength.

なお、上記抗張力の調整は、例えば、フィラメントに用いる鋼材中の炭素含有量を変えるなどの手法により行うことができる。例えば、コアストランド１の最外層フィラメント１１以外のフィラメントとしては、炭素含有量０．８０〜１．００重量％の高抗張力鋼を用いることが好ましく、これによりゴム物品の強度を確保することができる。また、スチールコードの捻じれを抑制して工揚作業性などを確保するためには、図示するように、コードの外周にラッピングフィラメント１４を巻き付けることが好ましい。   The tensile strength can be adjusted by a technique such as changing the carbon content in the steel used for the filament. For example, as the filament other than the outermost layer filament 11 of the core strand 1, it is preferable to use a high-tensile steel having a carbon content of 0.80 to 1.00% by weight, thereby ensuring the strength of the rubber article. . Moreover, in order to suppress twisting of the steel cord and ensure workability and the like, it is preferable to wrap the wrapping filament 14 around the outer periphery of the cord as shown in the drawing.

本発明のスチールコードにおいては、上記した以外の具体的なコード構造、シースストランド構造、各ストランドおよびコードの撚り条件等については特に制限されるものではなく、常法に従い適宜決定することができる。本発明のスチールコードは、空気入りタイヤ、工業用ベルト等の各種ゴム物品の補強用として好適に適用することができるものであり、特には、建設車両用等の重荷重用タイヤに好適に適用可能である。   In the steel cord of the present invention, specific cord structures other than those described above, a sheath strand structure, twisting conditions of each strand and cord, etc. are not particularly limited, and can be appropriately determined according to a conventional method. The steel cord of the present invention can be suitably applied to reinforce various rubber articles such as pneumatic tires and industrial belts, and can be particularly suitably applied to heavy load tires such as for construction vehicles. It is.

また、本発明の空気入りタイヤは、一対のビード部間でトロイド状に延びるカーカスを骨格とし、そのクラウン部をベルト層で補強してなるものであり、カーカスまたはベルト層に、上記本発明のゴム物品補強用スチールコードを用いたものであればよく、それ以外の具体的なタイヤ構造や材質等については、常法に従い適宜設定することができ、特に制限されるものではない。例えば、図示はしないが、ベルト層のクラウン部外周にはトレッド部が配置され、カーカスのサイド部にはサイドウォール部が配置されている。   Further, the pneumatic tire of the present invention has a carcass extending in a toroidal shape between a pair of bead portions as a skeleton, and the crown portion is reinforced with a belt layer. What is necessary is just to use the steel cord for rubber article reinforcement | strengthening, About other specific tire structures, materials, etc., it can set suitably according to a conventional method, and it does not restrict | limit in particular. For example, although not shown, a tread portion is disposed on the outer periphery of the crown portion of the belt layer, and a sidewall portion is disposed on the side portion of the carcass.

以下、本発明を、実施例を用いてより詳細に説明する。
下記の表１に示す条件に従い複撚り構造のゴム物品補強用スチールコードを製造して、得られた各スチールコードのコード強力を測定した。撚線後のコード強力発揮率については、各フィラメントを所定のコード構造に撚り合わせた直後にコード引張り強力を測定して、フィラメント抗張力の総和に対する比率を算出したものである。また、加硫後のコード強力発揮率については、各スチールコードをカーカスに補強材として適用してサイズ４０００Ｒ５７の建設車両用タイヤを製造し、得られたタイヤから切り出したスチールコードを用いて引張り強力を測定し、フィラメント抗張力の総和に対する比率を算出したものである。なお、フィラメントの抗張力＝（フィラメント張力）／（フィラメント断面積）である。
これらの結果を、下記の表１中に併せて示す。 Hereinafter, the present invention will be described in more detail with reference to examples.
Steel cords for reinforcing rubber articles having a double twist structure were manufactured according to the conditions shown in Table 1 below, and the cord strength of each steel cord obtained was measured. About the cord strength exhibiting rate after the stranded wire, the cord tensile strength is measured immediately after twisting each filament into a predetermined cord structure, and the ratio to the total filament tensile strength is calculated. Moreover, regarding the cord strength display rate after vulcanization, each steel cord is applied to the carcass as a reinforcing material to produce a tire for a size 4000R57 construction vehicle, and the tensile strength using the steel cord cut out from the obtained tire is used. And the ratio to the total filament tensile strength was calculated. The tensile strength of the filament = (filament tension) / (filament cross-sectional area).
These results are also shown in Table 1 below.

Figure 2008150757
Figure 2008150757

上記表１に示すように、コアストランドを構成する最外層シースフィラメントの抗張力を３１００Ｎ／ｍｍ２以下とし、かつ、残りの全てのフィラメントの抗張力を３１５０Ｎ／ｍｍ２以上とした実施例１，２のスチールコードにおいては、従来例１，２に比し、撚線後のコード強力発揮率と加硫後のコード強力発揮率とがいずれも向上していることが判る。 As shown in Table 1, the outermost sheath filaments constituting the core strand have a tensile strength of 3100 N / mm 2 or less, and all the remaining filaments have a tensile strength of 3150 N / mm 2 or more. In the steel cord, it can be seen that both the cord strength exhibiting rate after the stranded wire and the cord strength exhibiting rate after vulcanization are improved as compared with the conventional examples 1 and 2.

本発明の一実施の形態に係るゴム物品補強用スチールコードの断面図である（実施例１）。It is sectional drawing of the steel cord for rubber article reinforcement which concerns on one embodiment of this invention (Example 1). 実施例２に係るゴム物品補強用スチールコードの断面図である。It is sectional drawing of the steel cord for rubber article reinforcement which concerns on Example 2. FIG. 従来例１に係るゴム物品補強用スチールコードの断面図である。It is sectional drawing of the steel cord for rubber article reinforcement which concerns on the prior art example 1. FIG. 従来例２および比較例１に係るゴム物品補強用スチールコードの断面図である。It is sectional drawing of the steel cord for rubber article reinforcement which concerns on the prior art example 2 and the comparative example 1. FIG. 比較例２に係るゴム物品補強用スチールコードの断面図である。It is sectional drawing of the steel cord for rubber article reinforcement which concerns on the comparative example 2.

符号の説明Explanation of symbols

１ コアストランド
２ シースストランド
１１ 最外層シースフィラメント
１２ 内層シースフィラメント
１３ コアフィラメント
１４ ラッピングフィラメント DESCRIPTION OF SYMBOLS 1 Core strand 2 Sheath strand 11 Outermost layer sheath filament 12 Inner layer sheath filament 13 Core filament 14 Wrapping filament

Claims (5)

２層以上の層撚り構造を有するコアストランドの周りに、２層以上の層撚り構造を有するシースストランドを撚り合わせた複撚り構造のゴム物品補強用スチールコードにおいて、前記コアストランドを構成する最外層シースフィラメントの抗張力が３１００Ｎ／ｍｍ２以下であり、かつ、コードを構成するフィラメントのうち、該最外層シースフィラメントを除く全フィラメントの抗張力が、３１５０Ｎ／ｍｍ２以上であることを特徴とするゴム物品補強用スチールコード。 In the steel cord for reinforcing a rubber article having a double twist structure in which a sheath strand having a layer twist structure of two or more layers is twisted around a core strand having a layer twist structure of two or more layers, the outermost layer constituting the core strand A rubber article characterized in that the tensile strength of the sheath filament is 3100 N / mm 2 or less, and among the filaments constituting the cord, the tensile strength of all the filaments excluding the outermost sheath filament is 3150 N / mm 2 or more. Steel cord for reinforcement. 少なくとも前記コアストランドにおいて、各層を構成するフィラメントが、その内側の層を構成するフィラメントよりも太径である請求項１記載のゴム物品補強用スチールコード。   2. The steel cord for reinforcing rubber articles according to claim 1, wherein the filament constituting each layer has a larger diameter than the filament constituting the inner layer in at least the core strand. 前記コアストランドが２層の層撚り構造を有し、該コアストランドの外接円の面積に対する該コアストランドの最外層シースフィラメントの断面積の総和の比が、０．５３以上である請求項１または２記載のゴム物品補強用スチールコード。   The core strand has a two-layer twisted structure, and the ratio of the sum of the cross-sectional areas of the outermost sheath filaments of the core strand to the area of the circumscribed circle of the core strand is 0.53 or more. 2. Steel cord for reinforcing rubber articles. 前記コアストランドが３層の層撚り構造を有し、該コアストランドの外接円の面積に対する該コアストランドの最外層シースフィラメントの断面積の総和の比が、０．４３以上である請求項１または２記載のゴム物品補強用スチールコード。   The core strand has a three-layer twisted structure, and the ratio of the sum of the cross-sectional areas of the outermost sheath filaments of the core strand to the area of the circumscribed circle of the core strand is 0.43 or more. 2. Steel cord for reinforcing rubber articles. 一対のビード部間でトロイド状に延びるカーカスを骨格とし、該カーカスのクラウン部をベルト層で補強してなる空気入りタイヤであって、該カーカスまたはベルト層に、請求項１〜４のうちいずれか一項記載のゴム物品補強用スチールコードを用いたことを特徴とする空気入りタイヤ。   A pneumatic tire comprising a carcass extending in a toroidal shape between a pair of bead portions as a skeleton, and a crown portion of the carcass reinforced with a belt layer, wherein the carcass or the belt layer includes any one of claims 1 to 4. A pneumatic tire using the steel cord for reinforcing rubber articles according to claim 1.
JP2006342609A 2006-12-20 2006-12-20 Steel cords for reinforcing rubber articles and pneumatic tires Expired - Fee Related JP5036294B2 (en)

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WO2010126084A1 (en) * 2009-04-28 2010-11-04 株式会社ブリヂストン Rubber article-reinforcing steel cord and pneumatic tire
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US10895037B2 (en) 2014-07-28 2021-01-19 Bridgestone Corporation Steel cord for reinforcing rubber article
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