WO2019240101A1 - Cable bead and tire including same - Google Patents
Cable bead and tire including same Download PDFInfo
- Publication number
- WO2019240101A1 WO2019240101A1 PCT/JP2019/022992 JP2019022992W WO2019240101A1 WO 2019240101 A1 WO2019240101 A1 WO 2019240101A1 JP 2019022992 W JP2019022992 W JP 2019022992W WO 2019240101 A1 WO2019240101 A1 WO 2019240101A1
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- sheath
- cable bead
- tire
- filament
- bead
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/04—Bead cores
-
- 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
Definitions
- the present invention relates to a cable bead and a tire using the cable bead, and more particularly to a cable bead that can improve the breakdown pressure resistance of the tire while maintaining a light weight and a tire using the cable bead.
- Patent Document 1 proposes a cable bead having a five-layer structure.
- This cable bead is made of carbon steel whose sheath filament is brass-plated, and the core is made of carbon steel having a carbon content equal to or less than that of the sheath filament. Then, the cable bead is taken out from the new tire using the cable bead, the inner diameter of the filament circle when the sheath filament wound in the coil shape is loosened, and the inner diameter of the bead when embedded in the tire is a. In this case, the durability of the bead is improved by setting b / a> 0.90.
- Patent Document 1 the carbon content of the sheath filament is also examined. Specifically, when the carbon content of the sheath filament is less than 0.50% by weight, it is difficult to withstand the stress applied to the bead during traveling, and conversely, when it exceeds 0.90% by weight, It is stated that it is difficult to bend and that the minimum necessary elongation cannot be secured for a bead that can withstand the stresses that occur during tire travel.
- a cable bead that serves as a core for supporting an aircraft fuselage has a cable bead structure, that is, a core diameter, a sheath diameter, and the number of sheath filaments, based on the breakdown pressure resistance.
- Breaking pressure resistance is greatly affected by the strength of one sheath filament and the number of sheath filaments, and in order to ensure high breaking pressure resistance, it is necessary to increase the strength of the sheath filament. Therefore, conventionally, the sheath filament diameter is increased to increase the strength of the sheath filament. However, when the sheath filament diameter increases, the weight of the cable bead increases. Therefore, the breakdown pressure resistance and lightness of the tire are in a trade-off relationship.
- an object of the present invention is to provide a cable bead capable of improving the fracture pressure resistance of the tire while maintaining the light weight, and a tire using the same.
- the present inventor made the sheath filament diameter predetermined by setting the carbon content of the sheath filament and the chromium content within a predetermined range. It has been found that the above problems can be solved, and the present invention has been completed.
- a sheath filament has a carbon content of 0.90 mass% or more and 0.95 mass% or less, a chromium content of 0.15 mass% or more and 0.30 mass% or less, and
- the sheath filament constituting the sheath at least one sheath filament having a wire diameter smaller than that of the innermost sheath layer is used.
- the carbon content is measured by an infrared absorption method in accordance with JIS G1211 (Appendix 3: Total Carbon Quantitative Method—High Frequency Induction Furnace Combustion), and more specifically, a device called “CS-400” manufactured by LECO. Can be obtained by melting steel by high-frequency heating and performing quantitative analysis by an infrared absorption method.
- the layer structure is a 1 + A + B + C + D + E structure, A is 6 or more and 14 or less, B is 8 or more and 22 or less, C is 14 or more and 30 or less, D is 26 or more and 42 or less, and E is 32. It is preferable that it is 50 or more.
- 1 in the layer structure represents a core.
- the sheath filament is preferably subjected to brass plating. Furthermore, in the cable bead of the present invention, the tensile strength of the sheath filament is preferably 2000 MPa or more. In the cable bead of the present invention, the diameter of the sheath filament is preferably 1.20 mm or more and 2.40 mm or less.
- the tire of the present invention includes the cable bead of the present invention.
- the present invention it is possible to provide a cable bead capable of improving the fracture pressure resistance of the tire while maintaining the light weight, and a tire using the cable bead.
- the tire of the present invention can be suitably used for aircraft tires.
- FIG. 1 is a schematic cross-sectional view in a tire width direction of a tire according to a preferred embodiment of the present invention.
- FIG. 1 is a schematic cross-sectional view of a cable bead according to a preferred embodiment of the present invention.
- a cable bead 10 according to the present invention includes a core 1 made of steel formed in an annular shape and a sheath 3 made of at least one sheath layer in which a sheath filament 2 made of steel is spirally wound around the core 1. And having.
- the sheath 3 is a five-layer sheath including a first sheath layer 3a, a second sheath layer 3b, a third sheath layer 3c, a fourth sheath layer 3d, and a fifth sheath layer 3e, which are innermost sheath layers.
- the structure of the cable bead 10 of the present invention is not limited to this, and the sheath layer may be five or more layers.
- the illustrated cable bead 10 has a 1 + 8 + 16 + 27 + 33 + 39 structure.
- the carbon content of the sheath filament 2 is 0.90 mass% or more and 0.95 mass% or less, and the chromium content is 0.15 mass% or more and 0.30 mass% or less. It is.
- the sheath filament 2 can be reduced in diameter, and the cable bead 10 can be reduced in weight. That is, by setting the chromium content in the above range, even when the carbon content exceeds 0.90% by mass, the bead that can withstand the stress acting during running of the tire is difficult when the sheath filament is bent as described above.
- the strength of the sheath filament 2 can be improved without causing the problem that the necessary minimum elongation cannot be ensured.
- the sheath filament 2 can be reduced in diameter, which can contribute to weight reduction of the tire.
- the chromium content in the sheath filament 2 is less than 0.15% by mass, the above effect cannot be obtained and the sheath filament 2 cannot be provided with sufficient strength.
- chromium content exceeds 0.30 mass%, since it becomes disadvantageous on the surface of cost and the effect of this invention will be saturated, it is unpreferable.
- the carbon content is preferably 0.91 mass% or more and 0.94 mass% or less, and the chromium content is preferably 0.17 mass% or more and 0.25 mass% or less, more preferably 0 20 mass% or more and 0.23 mass% or less.
- the sheath filament constituting the sheath 3 In the cable bead 10 of the present invention, at least one type of sheath filament having a smaller wire diameter than the sheath filament of the innermost sheath layer is used as the sheath filament constituting the sheath 3. In conventional cable beads, all the sheath filaments have the same diameter. However, since the cable bead 10 of the present invention can increase the strength of the sheath filament 2 as described above, the sheath filament 2 can be reduced in diameter. Therefore, it is possible to contribute to weight reduction of the tire by using as the sheath filament 2 at least one sheath filament having a diameter smaller than that of the innermost sheath layer. For example, all the sheath filaments after the second sheath layer may be reduced in diameter, or only the sheath filaments of a predetermined sheath layer may be reduced in diameter.
- the sheath filament diameter of the n-th sheath layer is ds n and the sheath filament diameter of the (n + 1) -th sheath layer is ds n + 1
- the sheath filament diameter is reduced in the order of the first sheath layer 3a, the second sheath layer 3b, and the third sheath layer 3c, and the third sheath layer 3c, the fourth sheath layer 3d,
- the sheath filaments of the fifth sheath layer 3e have the same diameter, but the cable bead 10 of the present invention is not limited to this as long as the above relational expression is satisfied.
- the sheath layer is preferably 2 layers or more and 7 layers or less.
- a 1 + A + B + C + D + E structure is preferable, and in the illustrated tire, the sheath 3 provided around the core 1 is composed of five sheath layers.
- the number of sheath filaments 2 is preferably 6 to 14 or less, B to 8 to 22, C to 14 to 30, D to 26 to 42, E to 32 to 50, More preferably, A is from 7 to 12, B is from 12 to 20, C is from 18 to 26, D is from 28 to 40, and E is from 34 to 48.
- the sheath filament 2 is preferably plated.
- the plating treatment include brass plating, bronze plating, copper plating, zinc plating, and ternary alloy plating such as copper-cobalt-zinc plating. Brass plating is preferable.
- the brass plating composition is not particularly limited, but the copper content is preferably 60% by mass or more.
- the tensile strength of the sheath filament 2 is preferably 2000 MPa or more.
- the tensile strength of the sheath filament 2 is preferably 2000 MPa or more.
- the diameter of the sheath filament 2 is 1.20 mm or more and 2.40 mm or less.
- the diameter of the sheath filament is preferably 2.0 mm or greater and 8.0 mm or less from the viewpoint of lightness and strength.
- the carbon content and the chromium content in the sheath filament 2 may satisfy the above ranges, and the diameter of the sheath filament 2 may be set as described above. Absent.
- the core 1 of the cable bead 10 can be manufactured in an annular shape by abutting and welding both ends of the core filament. Thereafter, for example, the cable bead 10 of the present invention can be manufactured by winding the sheath filament 2 that satisfies the above-described requirements spirally by being wound around a supply reel, around the core 1 in a spiral manner. .
- the material of a core filament The material conventionally used as a core of a cable bead can be used.
- FIG. 2 is a schematic cross-sectional view in the tire width direction of a tire according to a preferred embodiment of the present invention.
- the illustrated tire 100 includes a tread portion 101, a pair of shoulder portions 102 located on both outer sides in the tire width direction of the tread portion 101, and a pair of sidewall portions 103 extending inward in the tire radial direction from the side portion of the shoulder portion 102.
- a bead portion 104 connected to the inner side in the tire radial direction of each sidewall portion 103 and a bead core 105 having a circular cross section embedded in the bead portion 104 are provided.
- the tire 100 includes a radial carcass 106 made of a carcass ply, which is formed of a plurality of organic fiber cords extending in a toroidal shape and extending at an angle in a range of 70 ° to 90 ° with respect to the tire equatorial plane. I have.
- the radial carcass 106 extends around each bead core 105 in the radial direction so as to cover a turn-up ply that is wound up from the inner side to the outer side in the tire width direction, and a portion of the turn-up ply that is wound with respect to the bead core 105
- it has a so-called up-down structure composed of a down ply extending at least to the radially inner portion of the bead core 105.
- the tire 100 of the present invention uses the cable bead of the present invention as the bead core 105 embedded in the bead portion 104.
- the cable bead of the present invention is a cable bead that can improve the breakdown pressure resistance while maintaining the lightness of the tire. Therefore, the tire 100 of the present invention is suitable for aircraft tires because it maintains lightness while improving fracture pressure resistance as compared with conventional tires.
- the tire 100 of the present invention is not particularly limited except that the cable bead of the present invention is used as the bead core 105, and a known structure can be adopted for other structures.
- a belt 107 composed of four belt layers and a belt protective layer 108 are sequentially arranged on the outer side in the tire radial direction of the radial carcass 106 of the tread portion 101.
- a tread rubber is disposed on the outer side of the belt protective layer 108 in the tire radial direction, and a groove 109 such as a circumferential groove extending in the tire circumferential direction is formed on the surface of the tread rubber.
- the belt 107 includes a total of four belt layers.
- the number and arrangement positions of the belt layers may be any number or as required. It can be an arrangement position.
- the cable bead of the present invention can improve the breakdown pressure resistance of the tire while maintaining the light weight.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ropes Or Cables (AREA)
- Tires In General (AREA)
Abstract
Provided are a cable bead with which it is possible to increase the high-pressure fracture resistance of a tire while maintaining lightweight properties, and a tire including the cable bead. The cable bead 10 comprises an annular core 1 constituted of steel and a sheath 3 configured of at least two sheath layers each composed of sheath filaments 2 constituted of steel and spirally wound around the core 1, wherein the sheath filaments 2 have a carbon content of 0.90-0.95 mass% and a chromium content of 0.15-0.30 mass% and the sheath filaments 2 constituting the sheath 3 comprise sheath filaments of the innermost sheath layer and at least one kind of sheath filaments each having a smaller diameter than the sheath filaments of the innermost sheath layer.
Description
本発明は、ケーブルビードおよびこれを用いたタイヤに関し、詳しくは、軽量性を維持しつつ、タイヤの破壊耐圧性を向上し得るケーブルビードおよびこれを用いたタイヤに関する。
The present invention relates to a cable bead and a tire using the cable bead, and more particularly to a cable bead that can improve the breakdown pressure resistance of the tire while maintaining a light weight and a tire using the cable bead.
航空機用タイヤのビードコアとして、環状のコアの周囲に、シースフィラメントを螺旋状に巻付けてなる１層以上のシースを形成した断面円形状である、いわゆるケーブルビードが知られている。このようなケーブルビードの改良技術として、特許文献１では、５層構造のケーブルビードが提案されている。
As a bead core for an aircraft tire, a so-called cable bead having a circular cross section in which one or more sheaths are formed by spirally winding a sheath filament around an annular core is known. As a technique for improving such a cable bead, Patent Document 1 proposes a cable bead having a five-layer structure.
このケーブルビードは、シースフィラメントがブラスめっきされた炭素鋼であり、コアがシースフィラメントと同等もしくはそれ以下の炭素含有量の炭素鋼から構成されている。そして、このケーブルビードを用いた新品タイヤからケーブルビードを取り出し、コイル状に巻き付けられているシースフィラメントをほぐした時のフィラメントの円の内径をｂ、タイヤに埋設されていたときのビード内径をａとしたとき、ｂ／ａ＞０．９０超とすることで、ビードの耐久性を向上させている。
This cable bead is made of carbon steel whose sheath filament is brass-plated, and the core is made of carbon steel having a carbon content equal to or less than that of the sheath filament. Then, the cable bead is taken out from the new tire using the cable bead, the inner diameter of the filament circle when the sheath filament wound in the coil shape is loosened, and the inner diameter of the bead when embedded in the tire is a. In this case, the durability of the bead is improved by setting b / a> 0.90.
また、特許文献１では、シースフィラメントの炭素含有量についても検討されている。具体的には、シースフィラメントの炭素含有量が０．５０重量％未満であると、走行中にビードが受ける応力に耐えがたく、また逆に０・９０重量％より大きくなった場合、型付け時に曲げにくいことや、タイヤ走行中に働く応力に耐えられるビードに必要最小限の伸びを確保できない、と述べられている。
In Patent Document 1, the carbon content of the sheath filament is also examined. Specifically, when the carbon content of the sheath filament is less than 0.50% by weight, it is difficult to withstand the stress applied to the bead during traveling, and conversely, when it exceeds 0.90% by weight, It is stated that it is difficult to bend and that the minimum necessary elongation cannot be secured for a bead that can withstand the stresses that occur during tire travel.
今日における航空機機体メーカーからタイヤメーカーに対する要求として、タイヤの破壊耐圧性と軽量化が挙げられる。航空機機体を支える芯の役割を果たすケーブルビードは、破壊耐圧性を基準として、ケーブルビードの構造、すなわち、コア径、シース径およびシースフィラメント本数が決められている。
Demands from today's aircraft body manufacturers to tire manufacturers include tire pressure resistance and weight reduction. A cable bead that serves as a core for supporting an aircraft fuselage has a cable bead structure, that is, a core diameter, a sheath diameter, and the number of sheath filaments, based on the breakdown pressure resistance.
破壊耐圧性はシースフィラメント１本の強力およびシースフィラメント本数によって大きく影響受け、高い破壊耐圧性を確保するためには、シースフィラメント強力を高くする必要がある。そのため、従来はシースフィラメント径を太くして、シースフィラメントの強力を高めていた。しかしながら、シースフィラメント径が太くなると、ケーブルビードの重量が重くなってしまう。したがって、タイヤの破壊耐圧性と軽量性とは、二律背反の関係にある。
Breaking pressure resistance is greatly affected by the strength of one sheath filament and the number of sheath filaments, and in order to ensure high breaking pressure resistance, it is necessary to increase the strength of the sheath filament. Therefore, conventionally, the sheath filament diameter is increased to increase the strength of the sheath filament. However, when the sheath filament diameter increases, the weight of the cable bead increases. Therefore, the breakdown pressure resistance and lightness of the tire are in a trade-off relationship.
そこで、本発明の目的は、軽量性を維持しつつ、タイヤの破壊耐圧性を向上し得るケーブルビードおよびこれを用いたタイヤを提供することにある。
Therefore, an object of the present invention is to provide a cable bead capable of improving the fracture pressure resistance of the tire while maintaining the light weight, and a tire using the same.
本発明者は、上記課題を解消するために鋭意検討した結果、シースフィラメントの炭素含有量、およびクロムの含有量を所定の範囲としたうえで、シースフィラメント径を所定のものとすることで、上記課題を解消できることを見出し、本発明を完成するに至った。
As a result of intensive studies to solve the above-mentioned problems, the present inventor made the sheath filament diameter predetermined by setting the carbon content of the sheath filament and the chromium content within a predetermined range. It has been found that the above problems can be solved, and the present invention has been completed.
すなわち、環状に形成されたスチールからなるコアと、該コアの周りにスチールからなるシースフィラメントが螺旋状に巻き付けられてなる、少なくとも２層のシース層からなるシースと、を有するケーブルビードにおいて、
前記シースフィラメントの炭素含有量が０．９０質量％以上０．９５質量％以下、クロム含有量が０．１５質量％以上０．３０質量％以下であり、かつ、
前記シースを構成するシースフィラメントとして、最内層シース層のシースフィラメントよりも線径が小さいシースフィラメントが少なくとも１種用いられていることを特徴とするものである。 That is, in a cable bead having a core made of steel formed in an annular shape and a sheath made of at least two sheath layers in which a sheath filament made of steel is spirally wound around the core,
The sheath filament has a carbon content of 0.90 mass% or more and 0.95 mass% or less, a chromium content of 0.15 mass% or more and 0.30 mass% or less, and
As the sheath filament constituting the sheath, at least one sheath filament having a wire diameter smaller than that of the innermost sheath layer is used.
前記シースフィラメントの炭素含有量が０．９０質量％以上０．９５質量％以下、クロム含有量が０．１５質量％以上０．３０質量％以下であり、かつ、
前記シースを構成するシースフィラメントとして、最内層シース層のシースフィラメントよりも線径が小さいシースフィラメントが少なくとも１種用いられていることを特徴とするものである。 That is, in a cable bead having a core made of steel formed in an annular shape and a sheath made of at least two sheath layers in which a sheath filament made of steel is spirally wound around the core,
The sheath filament has a carbon content of 0.90 mass% or more and 0.95 mass% or less, a chromium content of 0.15 mass% or more and 0.30 mass% or less, and
As the sheath filament constituting the sheath, at least one sheath filament having a wire diameter smaller than that of the innermost sheath layer is used.
ここで、炭素含有量は、ＪＩＳ Ｇ１２１１に準拠した赤外線吸収法（附属書３：全炭素定量法－高周波誘導加熱炉燃焼）により測定され、より詳細には、ＬＥＣＯ製「ＣＳ－４００」なる装置を用い、鋼を高周波加熱により溶解し、赤外線吸収法で定量分析を行うことにより求めることができる。また、クロムの含有量は、ＪＩＳ Ｇ１２５８－１（発光強度比法）に準拠して測定され、より詳細には、塩酸：硝酸：水＝１：１：２（質量比）の水溶液に鋼材を溶解し、ＩＣＰ分析（発光分光分析）することにより測定できる。
Here, the carbon content is measured by an infrared absorption method in accordance with JIS G1211 (Appendix 3: Total Carbon Quantitative Method—High Frequency Induction Furnace Combustion), and more specifically, a device called “CS-400” manufactured by LECO. Can be obtained by melting steel by high-frequency heating and performing quantitative analysis by an infrared absorption method. The chromium content is measured in accordance with JIS G1258-1 (emission intensity ratio method). More specifically, the steel material is added to an aqueous solution of hydrochloric acid: nitric acid: water = 1: 1: 2 (mass ratio). It can be measured by dissolving and ICP analysis (emission spectroscopic analysis).
本発明のケーブルビードにおいては、ｎ層目のシース層のシースフィラメント径をｄｓｎ、（ｎ＋１）層目のシース層のシースフィラメント径をｄｓｎ＋１としたとき、下記関係式、
ｄｓｎ≧ｄｓｎ＋１
を満足することが好ましい。また、本発明のケーブルビードにおいては、層構造は、１＋Ａ＋Ｂ＋Ｃ＋Ｄ＋Ｅ構造であり、Ａが６以上１４以下、Ｂが８以上２２以下、Ｃが１４以上３０以下、Ｄが２６以上４２以下、Ｅは３２以上５０以下であることが好ましい。ここで、層構造における１は、コアを表す。さらに、本発明のケーブルビードにおいては、前記シースフィラメントは、ブラスめっきを施されていることが好ましい。さらにまた、本発明のケーブルビードにおいては、前記シースフィラメントの抗張力は、２０００ＭＰａ以上であることが好ましい。また、本発明のケーブルビードにおいては、前記シースフィラメントの径は、１．２０ｍｍ以上２．４０ｍｍ以下であることが好ましい。 In the cable bead of the present invention, when the sheath filament diameter of the n-th sheath layer is ds n and the sheath filament diameter of the (n + 1) -th sheath layer is ds n + 1 , the following relational expression:
ds n ≧ ds n + 1
Is preferably satisfied. In the cable bead of the present invention, the layer structure is a 1 + A + B + C + D + E structure, A is 6 or more and 14 or less, B is 8 or more and 22 or less, C is 14 or more and 30 or less, D is 26 or more and 42 or less, and E is 32. It is preferable that it is 50 or more. Here, 1 in the layer structure represents a core. Furthermore, in the cable bead of the present invention, the sheath filament is preferably subjected to brass plating. Furthermore, in the cable bead of the present invention, the tensile strength of the sheath filament is preferably 2000 MPa or more. In the cable bead of the present invention, the diameter of the sheath filament is preferably 1.20 mm or more and 2.40 mm or less.
ｄｓｎ≧ｄｓｎ＋１
を満足することが好ましい。また、本発明のケーブルビードにおいては、層構造は、１＋Ａ＋Ｂ＋Ｃ＋Ｄ＋Ｅ構造であり、Ａが６以上１４以下、Ｂが８以上２２以下、Ｃが１４以上３０以下、Ｄが２６以上４２以下、Ｅは３２以上５０以下であることが好ましい。ここで、層構造における１は、コアを表す。さらに、本発明のケーブルビードにおいては、前記シースフィラメントは、ブラスめっきを施されていることが好ましい。さらにまた、本発明のケーブルビードにおいては、前記シースフィラメントの抗張力は、２０００ＭＰａ以上であることが好ましい。また、本発明のケーブルビードにおいては、前記シースフィラメントの径は、１．２０ｍｍ以上２．４０ｍｍ以下であることが好ましい。 In the cable bead of the present invention, when the sheath filament diameter of the n-th sheath layer is ds n and the sheath filament diameter of the (n + 1) -th sheath layer is ds n + 1 , the following relational expression:
ds n ≧ ds n + 1
Is preferably satisfied. In the cable bead of the present invention, the layer structure is a 1 + A + B + C + D + E structure, A is 6 or more and 14 or less, B is 8 or more and 22 or less, C is 14 or more and 30 or less, D is 26 or more and 42 or less, and E is 32. It is preferable that it is 50 or more. Here, 1 in the layer structure represents a core. Furthermore, in the cable bead of the present invention, the sheath filament is preferably subjected to brass plating. Furthermore, in the cable bead of the present invention, the tensile strength of the sheath filament is preferably 2000 MPa or more. In the cable bead of the present invention, the diameter of the sheath filament is preferably 1.20 mm or more and 2.40 mm or less.
本発明のタイヤは、本発明のケーブルビードを備えてなることを特徴とするものである。
The tire of the present invention includes the cable bead of the present invention.
本発明によれば、軽量性を維持しつつ、タイヤの破壊耐圧性を向上し得るケーブルビードおよびこれを用いたタイヤを提供することができる。本発明のタイヤは、航空機用タイヤに好適に用いることができる。
According to the present invention, it is possible to provide a cable bead capable of improving the fracture pressure resistance of the tire while maintaining the light weight, and a tire using the cable bead. The tire of the present invention can be suitably used for aircraft tires.
以下、本発明のケーブルビードについて、図面を用いて詳細に説明する。図１は、本発明の一好適な実施の形態に係るケーブルビードの概略断面図である。本発明のケーブルビード１０は、環状に形成されたスチールからなるコア１と、コア１の周りにスチールからなるシースフィラメント２が螺旋状に巻き付けられてなる、少なくとも１層のシース層からなるシース３と、を有する。図示例においては、シース３は、最内層シース層である第１シース層３ａ、第２シース層３ｂ、第３シース層３ｃ、第４シース層３ｄ、および第５シース層３ｅの５層のシース層を有しているが、本発明のケーブルビード１０の構造はこれに限られるものではなく、シース層は５層以上であってもよい。図示するケーブルビード１０においては、１＋８＋１６＋２７＋３３＋３９構造である。
Hereinafter, the cable bead of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a cable bead according to a preferred embodiment of the present invention. A cable bead 10 according to the present invention includes a core 1 made of steel formed in an annular shape and a sheath 3 made of at least one sheath layer in which a sheath filament 2 made of steel is spirally wound around the core 1. And having. In the illustrated example, the sheath 3 is a five-layer sheath including a first sheath layer 3a, a second sheath layer 3b, a third sheath layer 3c, a fourth sheath layer 3d, and a fifth sheath layer 3e, which are innermost sheath layers. Although it has a layer, the structure of the cable bead 10 of the present invention is not limited to this, and the sheath layer may be five or more layers. The illustrated cable bead 10 has a 1 + 8 + 16 + 27 + 33 + 39 structure.
本発明のケーブルビード１０においては、シースフィラメント２の炭素含有量は０．９０質量％以上０．９５質量％以下であり、かつ、クロム含有量は０．１５質量％以上０．３０質量％以下である。かかる条件を満足することで、シースフィラメント２を細径化することが可能となり、ケーブルビード１０を軽量化することができる。すなわち、クロム含有量を上記範囲とすることで、炭素含有量を０．９０質量％超としても、前述したような、シースフィラメントが型付け時に曲げにくい、タイヤ走行中に働く応力に耐えられるビードに必要最小限の伸びが確保できない、といった不具合を生じることなく、シースフィラメント２の強力を向上させることができる。その結果、シースフィラメント２の細径化が可能になり、タイヤの軽量化に寄与することができる。シースフィラメント２中のクロム含有量が０．１５質量％未満であると、上記効果が得られず、シースフィラメント２に十分な強力を与えることができない。なお、クロム含有量が０．３０質量％を超えると、コストの面で不利になり、また、本発明の効果が飽和してしまうため、好ましくない。炭素含有量は、好適には０．９１質量％以上０．９４質量％以下であり、クロム含有量は、好適には０．１７質量％以上０．２５質量％以下、より好適には、０．２０質量％以上０．２３質量％以下である。このような条件を満足することで、ケーブルビード１０全体における炭素含有量およびクロム含有量のバラツキを抑えることができ、その結果、ケーブルビード１０の物性のバラツキが少なくなる。
In the cable bead 10 of the present invention, the carbon content of the sheath filament 2 is 0.90 mass% or more and 0.95 mass% or less, and the chromium content is 0.15 mass% or more and 0.30 mass% or less. It is. By satisfying such conditions, the sheath filament 2 can be reduced in diameter, and the cable bead 10 can be reduced in weight. That is, by setting the chromium content in the above range, even when the carbon content exceeds 0.90% by mass, the bead that can withstand the stress acting during running of the tire is difficult when the sheath filament is bent as described above. The strength of the sheath filament 2 can be improved without causing the problem that the necessary minimum elongation cannot be ensured. As a result, the sheath filament 2 can be reduced in diameter, which can contribute to weight reduction of the tire. When the chromium content in the sheath filament 2 is less than 0.15% by mass, the above effect cannot be obtained and the sheath filament 2 cannot be provided with sufficient strength. In addition, when chromium content exceeds 0.30 mass%, since it becomes disadvantageous on the surface of cost and the effect of this invention will be saturated, it is unpreferable. The carbon content is preferably 0.91 mass% or more and 0.94 mass% or less, and the chromium content is preferably 0.17 mass% or more and 0.25 mass% or less, more preferably 0 20 mass% or more and 0.23 mass% or less. By satisfying such conditions, variation in the carbon content and chromium content in the entire cable bead 10 can be suppressed, and as a result, variation in physical properties of the cable bead 10 is reduced.
また、本発明のケーブルビード１０においては、シース３を構成するシースフィラメントとして、最内層シース層のシースフィラメントよりも線径の細いシースフィラメントが少なくとも１種用いられている。従来のケーブルビードにおいては、シースフィラメントは全て同径であった。しかしながら、本発明のケーブルビード１０は、前述のとおり、シースフィラメント２の強力を大きくすることができるため、シースフィラメント２の細径化が可能となっている。したがって、シースフィラメント２として、最内層シース層のシースフィラメントよりも細径のシースフィラメントを少なくとも１種用いることで、タイヤの軽量化に寄与することができる。例えば、第２シース層以降のシースフィラメントを全て細径化してもよいし、所定のシース層のシースフィラメントのみを細径化してもよい。
In the cable bead 10 of the present invention, at least one type of sheath filament having a smaller wire diameter than the sheath filament of the innermost sheath layer is used as the sheath filament constituting the sheath 3. In conventional cable beads, all the sheath filaments have the same diameter. However, since the cable bead 10 of the present invention can increase the strength of the sheath filament 2 as described above, the sheath filament 2 can be reduced in diameter. Therefore, it is possible to contribute to weight reduction of the tire by using as the sheath filament 2 at least one sheath filament having a diameter smaller than that of the innermost sheath layer. For example, all the sheath filaments after the second sheath layer may be reduced in diameter, or only the sheath filaments of a predetermined sheath layer may be reduced in diameter.
本発明のケーブルビード１０においては、ｎ層目のシース層のシースフィラメント径をｄｓｎ、（ｎ＋１）層目のシース層のシースフィラメント径をｄｓｎ＋１としたとき、下記関係式、
ｄｓｎ≧ｄｓｎ＋１
を満足することが好ましい。すなわち、最内層シース層から最外層シース層、図示例においては第５シース層３ｅに向かって、シースフィラメントの径が細径化していくことが好ましい。ケーブルビード１０に対する曲げ入力時には、外層シース層のシースフィラメントほど曲げが大きい。そこで、外層シース層のシースフィラメントを細径化することでシースフィラメントの柔軟性を確保し、その結果、ケーブルビード１０の良好な疲労性を確保することができる。図示するケーブルビード１０においては、第１シース層３ａから、第２シース層３ｂ、第３シース層３ｃの順にシースフィラメント径が細径化しており、第３シース層３ｃ、第４シース層３ｄ、第５シース層３ｅの各シースフィラメントは同径となっているが、本発明のケーブルビード１０は、上記関係式を満足するのであれば、これに限られるものではない。 In the cable bead 10 of the present invention, when the sheath filament diameter of the n-th sheath layer is ds n and the sheath filament diameter of the (n + 1) -th sheath layer is ds n + 1 , the following relational expression:
ds n ≧ ds n + 1
Is preferably satisfied. That is, it is preferable that the diameter of the sheath filament is reduced from the innermost sheath layer toward the outermost sheath layer, in the illustrated example, toward thefifth sheath layer 3e. At the time of bending input to the cable bead 10, the bending is larger as the sheath filament of the outer sheath layer. Therefore, by reducing the diameter of the sheath filament of the outer sheath layer, the flexibility of the sheath filament is ensured, and as a result, good fatigue properties of the cable bead 10 can be ensured. In the cable bead 10 shown in the figure, the sheath filament diameter is reduced in the order of the first sheath layer 3a, the second sheath layer 3b, and the third sheath layer 3c, and the third sheath layer 3c, the fourth sheath layer 3d, The sheath filaments of the fifth sheath layer 3e have the same diameter, but the cable bead 10 of the present invention is not limited to this as long as the above relational expression is satisfied.
ｄｓｎ≧ｄｓｎ＋１
を満足することが好ましい。すなわち、最内層シース層から最外層シース層、図示例においては第５シース層３ｅに向かって、シースフィラメントの径が細径化していくことが好ましい。ケーブルビード１０に対する曲げ入力時には、外層シース層のシースフィラメントほど曲げが大きい。そこで、外層シース層のシースフィラメントを細径化することでシースフィラメントの柔軟性を確保し、その結果、ケーブルビード１０の良好な疲労性を確保することができる。図示するケーブルビード１０においては、第１シース層３ａから、第２シース層３ｂ、第３シース層３ｃの順にシースフィラメント径が細径化しており、第３シース層３ｃ、第４シース層３ｄ、第５シース層３ｅの各シースフィラメントは同径となっているが、本発明のケーブルビード１０は、上記関係式を満足するのであれば、これに限られるものではない。 In the cable bead 10 of the present invention, when the sheath filament diameter of the n-th sheath layer is ds n and the sheath filament diameter of the (n + 1) -th sheath layer is ds n + 1 , the following relational expression:
ds n ≧ ds n + 1
Is preferably satisfied. That is, it is preferable that the diameter of the sheath filament is reduced from the innermost sheath layer toward the outermost sheath layer, in the illustrated example, toward the
本発明のケーブルビード１０においては、シース層は２層以上７層以下であることが好ましい。特に、１＋Ａ＋Ｂ＋Ｃ＋Ｄ＋Ｅ構造であることが好ましく、図示例のタイヤにおいては、コア１の周りに設けられるシース３は５層のシース層からなる。また、シースフィラメント２の本数は、好適には、Ａが６以上１４以下、Ｂが８以上２２以下、Ｃが１４以上３０以下、Ｄが２６以上４２以下、Ｅは３２以上５０以下であり、より好適には、Ａは７以上１２以下、Ｂは１２以上２０以下、Ｃは１８以上２６以下、Ｄは２８以上４０以下、Ｅは３４以上４８以下である。かかる構造とすることで、本発明のケーブルビードをタイヤのビードコアに用いた場合に、軽量性を維持しつつ、タイヤの破壊耐圧性を向上させることができる。
In the cable bead 10 of the present invention, the sheath layer is preferably 2 layers or more and 7 layers or less. In particular, a 1 + A + B + C + D + E structure is preferable, and in the illustrated tire, the sheath 3 provided around the core 1 is composed of five sheath layers. Further, the number of sheath filaments 2 is preferably 6 to 14 or less, B to 8 to 22, C to 14 to 30, D to 26 to 42, E to 32 to 50, More preferably, A is from 7 to 12, B is from 12 to 20, C is from 18 to 26, D is from 28 to 40, and E is from 34 to 48. With such a structure, when the cable bead of the present invention is used for a bead core of a tire, the breakdown pressure resistance of the tire can be improved while maintaining light weight.
また、本発明のケーブルビード１０においては、シースフィラメント２はめっき処理が施されていることが好ましい。めっき処理としては、ブラスめっきやブロンズめっき、銅めっき、亜鉛めっき、銅－コバルト－亜鉛めっき等の三元系合金めっき等が挙げられるが、ブラスめっきが好ましい。シースフィラメント２にブラスめっきを施すことで、ケーブルビード１０とゴムとの接着性を向上させることができ、タイヤの耐久性を向上させることができる。なお、ブラスめっきの組成としては、特に制限されるものはないが、好適には銅の含有率は６０質量％以上である。
Moreover, in the cable bead 10 of the present invention, the sheath filament 2 is preferably plated. Examples of the plating treatment include brass plating, bronze plating, copper plating, zinc plating, and ternary alloy plating such as copper-cobalt-zinc plating. Brass plating is preferable. By performing brass plating on the sheath filament 2, the adhesion between the cable bead 10 and rubber can be improved, and the durability of the tire can be improved. The brass plating composition is not particularly limited, but the copper content is preferably 60% by mass or more.
さらに、本発明のケーブルビード１０においては、シースフィラメント２の抗張力は２０００ＭＰａ以上であることが好ましい。シースフィラメント２の抗張力を２０００ＭＰａ以上とすることで、本発明のケーブルビード１０を航空機用タイヤのビードコアとして用いた場合、十分な強度を発揮することができる。また、シースフィラメント２の抗張力が高いほど、シースフィラメント２の本数を少なくすることができるため、タイヤの軽量化の面でも好ましい。
Furthermore, in the cable bead 10 of the present invention, the tensile strength of the sheath filament 2 is preferably 2000 MPa or more. By setting the tensile strength of the sheath filament 2 to 2000 MPa or more, when the cable bead 10 of the present invention is used as a bead core of an aircraft tire, sufficient strength can be exhibited. Further, the higher the tensile strength of the sheath filament 2, the smaller the number of sheath filaments 2, which is preferable in terms of weight reduction of the tire.
さらにまた、本発明のケーブルビード１０においては、シースフィラメント２の径は、１．２０ｍｍ以上２．４０ｍｍ以下であることが好ましい。シースフィラメントの径をかかる範囲とすることで、本発明のケーブルビード１０を航空機用タイヤのビードコアとして用いた場合、タイヤの軽量性を維持することができ、また、十分な強度を発揮することができる。なお、本発明のケーブルビード１０を航空機用タイヤに適用する場合、コアフィラメントの径は、軽量性および強度の観点から、２．０ｍｍ以上８．０ｍｍ以下が好ましい。
Furthermore, in the cable bead 10 of the present invention, it is preferable that the diameter of the sheath filament 2 is 1.20 mm or more and 2.40 mm or less. By setting the diameter of the sheath filament in such a range, when the cable bead 10 of the present invention is used as a bead core of an aircraft tire, the weight of the tire can be maintained and sufficient strength can be exhibited. it can. In addition, when the cable bead 10 of the present invention is applied to an aircraft tire, the diameter of the core filament is preferably 2.0 mm or greater and 8.0 mm or less from the viewpoint of lightness and strength.
本発明のケーブルビード１０は、シースフィラメント２中の炭素含有量およびクロム含有量が上記範囲を満足し、かつ、シースフィラメント２の径を上述のとおりとすればよく、それ以外については特に制限はない。例えば、ケーブルビード１０のコア１は、コアフィラメントの両端を突き合わせて溶接して環状に製造することができる。その後、例えば、供給リールに巻回されることにより螺旋型付けされた、上記要件を満足するシースフィラメント２を、コア１に螺旋状に巻き付けることで、本発明のケーブルビード１０を製造することができる。コアフィラメントの材質についても特に制限はなく、従来ケーブルビードのコアとして用いられてきた材質を用いることができる。
In the cable bead 10 of the present invention, the carbon content and the chromium content in the sheath filament 2 may satisfy the above ranges, and the diameter of the sheath filament 2 may be set as described above. Absent. For example, the core 1 of the cable bead 10 can be manufactured in an annular shape by abutting and welding both ends of the core filament. Thereafter, for example, the cable bead 10 of the present invention can be manufactured by winding the sheath filament 2 that satisfies the above-described requirements spirally by being wound around a supply reel, around the core 1 in a spiral manner. . There is no restriction | limiting in particular also about the material of a core filament, The material conventionally used as a core of a cable bead can be used.
次に、本発明のタイヤについて説明する。図２は、本発明の一好適な実施の形態に係るタイヤのタイヤ幅方向における概略断面図である。図示するタイヤ１００は、トレッド部１０１と、トレッド部１０１のタイヤ幅方向両外側に位置する一対のショルダー部１０２と、ショルダー部１０２の側部からタイヤ径方向内方に延びる一対のサイドウォール部１０３と、各サイドウォール部１０３のタイヤ径方向内方に連なるビード部１０４と、ビード部１０４に埋設されてなる断面円形のビードコア１０５を備えている。
Next, the tire of the present invention will be described. FIG. 2 is a schematic cross-sectional view in the tire width direction of a tire according to a preferred embodiment of the present invention. The illustrated tire 100 includes a tread portion 101, a pair of shoulder portions 102 located on both outer sides in the tire width direction of the tread portion 101, and a pair of sidewall portions 103 extending inward in the tire radial direction from the side portion of the shoulder portion 102. In addition, a bead portion 104 connected to the inner side in the tire radial direction of each sidewall portion 103 and a bead core 105 having a circular cross section embedded in the bead portion 104 are provided.
また、タイヤ１００は、トロイド状に延在し、タイヤ赤道面に対して７０°以上９０°以下の範囲の角度で延びる複数本の有機繊維コードからなる、カーカスプライにて構成したラジアルカーカス１０６を備えている。このラジアルカーカス１０６は、各ビードコア１０５の周りに、タイヤ幅方向の内側から外側へ巻上げてなるターンアッププライと、これらのターンアッププライの、ビードコア１０５に対する巻上げ部分を覆って半径方向内方に延びて、少なくとも、ビードコア１０５の半径方向内方部分まで延在する、ダウンプライとからなる、いわゆるアップダウン構造を有する。このようなアップダウン構造とすることにより、ターンアッププライおよびダウンプライのそれぞれに働くビードコア１０５の周りの張力の相殺による、それら相互の引き抜け拘束力の作用下で、カーカスプライが引き抜けるのを有効に防止することができる。その結果、航空機用ラジアルタイヤに求められる耐圧性、耐荷重性等を十分に確保することができる。
Further, the tire 100 includes a radial carcass 106 made of a carcass ply, which is formed of a plurality of organic fiber cords extending in a toroidal shape and extending at an angle in a range of 70 ° to 90 ° with respect to the tire equatorial plane. I have. The radial carcass 106 extends around each bead core 105 in the radial direction so as to cover a turn-up ply that is wound up from the inner side to the outer side in the tire width direction, and a portion of the turn-up ply that is wound with respect to the bead core 105 Thus, it has a so-called up-down structure composed of a down ply extending at least to the radially inner portion of the bead core 105. By adopting such an up-down structure, it is effective that the carcass ply is pulled out under the action of the mutual pulling-out restraining force by canceling the tension around the bead core 105 acting on each of the turn-up ply and the down ply. Can be prevented. As a result, sufficient pressure resistance, load resistance and the like required for the radial tire for aircraft can be ensured.
本発明のタイヤ１００は、ビード部１０４に埋設されてなるビードコア１０５として、本発明のケーブルビードを用いる。前述のとおり、本発明のケーブルビードは、タイヤの軽量性を維持しつつ、破壊耐圧性を向上させることができるケーブルビードである。したがって、本発明のタイヤ１００は、従来のタイヤと比較して、破壊耐圧性が向上しながらも、軽量性を維持しており、航空機用タイヤに好適である。
The tire 100 of the present invention uses the cable bead of the present invention as the bead core 105 embedded in the bead portion 104. As described above, the cable bead of the present invention is a cable bead that can improve the breakdown pressure resistance while maintaining the lightness of the tire. Therefore, the tire 100 of the present invention is suitable for aircraft tires because it maintains lightness while improving fracture pressure resistance as compared with conventional tires.
本発明のタイヤ１００は、ビードコア１０５として本発明のケーブルビードを用いたこと以外に特に制限はなく、その他の構造等については、既知の構造を採用することができる。例えば、図示例においては、トレッド部１０１のラジアルカーカス１０６のタイヤ径方向外方には、４層のベルト層からなるベルト１０７および１層のベルト保護層１０８が順次配設されている。また、ベルト保護層１０８のタイヤ径方向外方には、トレッドゴムが配設されており、トレッドゴムの表面には、タイヤ周方向に延びる周方向溝等の溝１０９が形成されている。なお、図示例では、ベルト１０７が合計４層のベルト層からなる場合を示しているが、本発明のタイヤ１００においては、ベルト層の数や配設位置は、必要に応じて任意の数や配設位置とすることができる。
The tire 100 of the present invention is not particularly limited except that the cable bead of the present invention is used as the bead core 105, and a known structure can be adopted for other structures. For example, in the illustrated example, a belt 107 composed of four belt layers and a belt protective layer 108 are sequentially arranged on the outer side in the tire radial direction of the radial carcass 106 of the tread portion 101. Further, a tread rubber is disposed on the outer side of the belt protective layer 108 in the tire radial direction, and a groove 109 such as a circumferential groove extending in the tire circumferential direction is formed on the surface of the tread rubber. In the illustrated example, the belt 107 includes a total of four belt layers. However, in the tire 100 of the present invention, the number and arrangement positions of the belt layers may be any number or as required. It can be an arrangement position.
以下、本発明を、実施例を用いてより詳細に説明する。
＜従来例、比較例１～５および実施例１～３＞
表１、２に示す炭素含有量およびクロム含有量を有するスチールフィラメントを用い、同表に示す構造のケーブルビードを作製した際の重量を計算により求めた。結果は、比較例３のタイヤの重量を１００としたときの指数値にて示した。また、比較例３について、得られたケーブルビードを用いて、図２に示すタイプの航空機タイヤ（タイヤサイズ：５２×２１Ｒ２２）を作製し、下記の手順で安全率を測定した。比較例１、２、４、５および実施例１～３については、比較例３の総強力の比に基づいて安全率を算出し指数化した。得られた結果を同表に併記する。数値が大きいほど耐圧性が良好である。なお、安全率においては、指数１ポイントの差は有意であり、差として十分に認識できるものである。 Hereinafter, the present invention will be described in more detail with reference to examples.
<Conventional Example, Comparative Examples 1 to 5 and Examples 1 to 3>
Using the steel filament having the carbon content and the chromium content shown in Tables 1 and 2, the weight when a cable bead having the structure shown in the same table was produced was determined by calculation. The results are shown as index values when the weight of the tire of Comparative Example 3 is taken as 100. Moreover, about the comparative example 3, the aircraft tire (tire size: 52 * 21R22) of the type shown in FIG. 2 was produced using the obtained cable bead, and the safety factor was measured in the following procedure. For Comparative Examples 1, 2, 4, 5 and Examples 1 to 3, the safety factor was calculated and indexed based on the ratio of the total strength of Comparative Example 3. The obtained results are also shown in the table. The larger the value, the better the pressure resistance. In the safety factor, a difference of 1 index is significant and can be sufficiently recognized as a difference.
＜従来例、比較例１～５および実施例１～３＞
表１、２に示す炭素含有量およびクロム含有量を有するスチールフィラメントを用い、同表に示す構造のケーブルビードを作製した際の重量を計算により求めた。結果は、比較例３のタイヤの重量を１００としたときの指数値にて示した。また、比較例３について、得られたケーブルビードを用いて、図２に示すタイプの航空機タイヤ（タイヤサイズ：５２×２１Ｒ２２）を作製し、下記の手順で安全率を測定した。比較例１、２、４、５および実施例１～３については、比較例３の総強力の比に基づいて安全率を算出し指数化した。得られた結果を同表に併記する。数値が大きいほど耐圧性が良好である。なお、安全率においては、指数１ポイントの差は有意であり、差として十分に認識できるものである。 Hereinafter, the present invention will be described in more detail with reference to examples.
<Conventional Example, Comparative Examples 1 to 5 and Examples 1 to 3>
Using the steel filament having the carbon content and the chromium content shown in Tables 1 and 2, the weight when a cable bead having the structure shown in the same table was produced was determined by calculation. The results are shown as index values when the weight of the tire of Comparative Example 3 is taken as 100. Moreover, about the comparative example 3, the aircraft tire (tire size: 52 * 21R22) of the type shown in FIG. 2 was produced using the obtained cable bead, and the safety factor was measured in the following procedure. For Comparative Examples 1, 2, 4, 5 and Examples 1 to 3, the safety factor was calculated and indexed based on the ratio of the total strength of Comparative Example 3. The obtained results are also shown in the table. The larger the value, the better the pressure resistance. In the safety factor, a difference of 1 index is significant and can be sufficiently recognized as a difference.
＜安全率＞
比較例３のタイヤをリムサイズ５２×２１Ｒ２２のリムに装着し、タイヤ内を水で満たし内圧を上昇させた時、タイヤが破壊する圧力と、ＴＲＡで定められた規定内圧に対する比（タイヤが破壊する圧力／ＴＲＡで定められた正規内圧）を測定した。 <Safety factor>
When the tire of Comparative Example 3 is mounted on a rim having a rim size of 52 × 21R22, and the inside of the tire is filled with water and the internal pressure is increased, the ratio of the pressure at which the tire breaks to the specified internal pressure defined by TRA (the tire breaks down) Pressure / normal internal pressure determined by TRA).
比較例３のタイヤをリムサイズ５２×２１Ｒ２２のリムに装着し、タイヤ内を水で満たし内圧を上昇させた時、タイヤが破壊する圧力と、ＴＲＡで定められた規定内圧に対する比（タイヤが破壊する圧力／ＴＲＡで定められた正規内圧）を測定した。 <Safety factor>
When the tire of Comparative Example 3 is mounted on a rim having a rim size of 52 × 21R22, and the inside of the tire is filled with water and the internal pressure is increased, the ratio of the pressure at which the tire breaks to the specified internal pressure defined by TRA (the tire breaks down) Pressure / normal internal pressure determined by TRA).
以上より、本発明のケーブルビードは、軽量性を維持しつつ、タイヤの破壊耐圧性を向上し得るものであることが分かる。
From the above, it can be seen that the cable bead of the present invention can improve the breakdown pressure resistance of the tire while maintaining the light weight.
１ コア
２ シースフィラメント
３ シース
１０ ケーブルビード
１００ タイヤ
１０１ トレッド部
１０２ ショルダー部
１０３ サイドウォール部
１０４ ビード部
１０５ ビードコア
１０６ ラジアルカーカス
１０７ ベルト
１０８ ベルト保護層
１０９ 溝 DESCRIPTION OFSYMBOLS 1 Core 2 Sheath filament 3 Sheath 10 Cable bead 100 Tire 101 Tread part 102 Shoulder part 103 Side wall part 104 Bead part 105 Bead core 106 Radial carcass 107 Belt 108 Belt protective layer 109 Groove
２ シースフィラメント
３ シース
１０ ケーブルビード
１００ タイヤ
１０１ トレッド部
１０２ ショルダー部
１０３ サイドウォール部
１０４ ビード部
１０５ ビードコア
１０６ ラジアルカーカス
１０７ ベルト
１０８ ベルト保護層
１０９ 溝 DESCRIPTION OF
Claims (7)
- 環状に形成されたスチールからなるコアと、該コアの周りにスチールからなるシースフィラメントが螺旋状に巻き付けられてなる、少なくとも２層のシース層からなるシースと、を有するケーブルビードにおいて、
前記シースフィラメントの炭素含有量が０．９０質量％以上０．９５質量％以下、クロム含有量が０．１５質量％以上０．３０質量％以下であり、かつ、
前記シースを構成するシースフィラメントとして、最内層シース層のシースフィラメントよりも線径が小さいシースフィラメントが少なくとも１種用いられていることを特徴とするケーブルビード。 A cable bead having a core made of steel formed in an annular shape and a sheath made of at least two sheath layers in which a sheath filament made of steel is spirally wound around the core,
The sheath filament has a carbon content of 0.90 mass% or more and 0.95 mass% or less, a chromium content of 0.15 mass% or more and 0.30 mass% or less, and
A cable bead characterized in that at least one type of sheath filament having a smaller wire diameter than that of the innermost sheath layer is used as the sheath filament constituting the sheath. - ｎ層目のシース層のシースフィラメント径をｄｓｎ、（ｎ＋１）層目のシース層のシースフィラメント径をｄｓｎ＋１としたとき、下記関係式、
ｄｓｎ≧ｄｓｎ＋１
を満足する請求項１記載のケーブルビード。 When the sheath filament diameter of the n-th sheath layer is ds n and the sheath filament diameter of the (n + 1) -th sheath layer is ds n + 1 , the following relational expression:
ds n ≧ ds n + 1
The cable bead according to claim 1, wherein: - 層構造が、１＋Ａ＋Ｂ＋Ｃ＋Ｄ＋Ｅ構造であり、Ａが６以上１４以下、Ｂが８以上２２以下、Ｃが１４以上３０以下、Ｄが２６以上４２以下、Ｅは３２以上５０以下である請求項１または２記載のケーブルビード。 The layer structure is a 1 + A + B + C + D + E structure, wherein A is 6 or more and 14 or less, B is 8 or more and 22 or less, C is 14 or more and 30 or less, D is 26 or more and 42 or less, and E is 32 or more and 50 or less. Cable bead as described.
- 前記シースフィラメントが、ブラスめっきを施されている請求項１～３のうちいずれか一項記載のケーブルビード。 The cable bead according to any one of claims 1 to 3, wherein the sheath filament is brass-plated.
- 前記シースフィラメントの抗張力が、２０００ＭＰａ以上である請求項１～４のうちいずれか一項記載のケーブルビード。 The cable bead according to any one of claims 1 to 4, wherein the tensile strength of the sheath filament is 2000 MPa or more.
- 前記シースフィラメントの径が、１．２０ｍｍ以上２．４０ｍｍ以下である請求項１～５のうちいずれか一項記載のケーブルビード。 The cable bead according to any one of claims 1 to 5, wherein a diameter of the sheath filament is 1.20 mm or more and 2.40 mm or less.
- 請求項１～６のうちいずれか一項記載のケーブルビードを備えてなることを特徴とするタイヤ。 A tire comprising the cable bead according to any one of claims 1 to 6.
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| JP2018-111392 | 2018-06-11 |
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| US20220185035A1 (en) * | 2020-12-16 | 2022-06-16 | The Goodyear Tire & Rubber Company | Tire with improved bead structure |
| US20220185034A1 (en) * | 2020-12-16 | 2022-06-16 | The Goodyear Tire & Rubber Company | Tire with improved bead structure |
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| EP4015254A1 (en) * | 2020-12-16 | 2022-06-22 | The Goodyear Tire & Rubber Company | Tire with improved bead structure |
Also Published As
| Publication number | Publication date |
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| JP7177831B2 (en) | 2022-11-24 |
| JPWO2019240101A1 (en) | 2021-07-15 |
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