JPH03279004A - Pneumatic radial tire - Google Patents
Pneumatic radial tireInfo
- Publication number
- JPH03279004A JPH03279004A JP2188990A JP18899090A JPH03279004A JP H03279004 A JPH03279004 A JP H03279004A JP 2188990 A JP2188990 A JP 2188990A JP 18899090 A JP18899090 A JP 18899090A JP H03279004 A JPH03279004 A JP H03279004A
- Authority
- JP
- Japan
- Prior art keywords
- belt
- tire
- layer
- elongation
- pneumatic radial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003014 reinforcing effect Effects 0.000 claims description 17
- 239000002131 composite material Substances 0.000 claims description 10
- 229920001778 nylon Polymers 0.000 abstract description 8
- 229920006231 aramid fiber Polymers 0.000 abstract description 5
- 230000002787 reinforcement Effects 0.000 abstract description 5
- 239000011324 bead Substances 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/005—Reinforcements made of different materials, e.g. hybrid or composite cords
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ベルト補強層を改善した空気入りラジアルタ
イヤに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pneumatic radial tire with an improved belt reinforcement layer.
（従来の技術）
空気入りラジアルタイヤにおいて、高速耐久性を向上さ
せるために、第３図（１） （２）で示すように、トレ
ッド部に埋設したベルト層Ｂの外周側に、ヘルド補強層
Ａを備えたものがあり、このベルト補強層は高速走行時
におけるベルト層の遠心力によるせり上りを抑制する効
果がある。(Prior Art) In order to improve the high-speed durability of pneumatic radial tires, as shown in Figure 3 (1) and (2), a heald reinforcing layer is provided on the outer circumferential side of the belt layer B embedded in the tread. Some belts are equipped with A, and this belt reinforcing layer has the effect of suppressing the rise of the belt layer due to centrifugal force during high-speed running.
（発明が解決しようとする課題）
従来のベルト補強層は、−船釣にはポリアミドコードか
ら構成されており、生タイヤの外周をモールド外周より
小さくし、モールドインさせるため、ベルト補強層Ａの
巻き初めＡＩと巻き終り舵のジヨイント重なり代りが、
生タイヤを加硫してモールドにフィツトさせたとき、生
タイヤの外周が大きくなるため、前記型なり代りにずれ
が生じる。(Problems to be Solved by the Invention) Conventional belt reinforcing layers are made of polyamide cord for boat fishing, and in order to make the outer circumference of the raw tire smaller than the outer circumference of the mold and mold it in, the belt reinforcing layer A is Instead of the joint overlap between the AI at the beginning of winding and the rudder at the end of winding,
When a green tire is vulcanized and fitted into a mold, the outer periphery of the green tire becomes large, so that deviations occur instead of the shape of the mold.
すなわち、第３図ｆｉｌは未加硫タイヤで、ベルト層Ｂ
に巻付けたベルト補強層Ａの重なり代はしてあり、これ
を加硫すると第３図（２）で示す如く重なり代がＬｌと
なり、Ｌ＞Ｌｌがずれ量（Ｌ−Ｌｌ）となる。That is, FIG. 3 fil is an unvulcanized tire, and the belt layer B
The overlap margin of the belt reinforcing layer A wound around the belt reinforcing layer A is determined, and when this is vulcanized, the overlap margin becomes Ll as shown in FIG. 3 (2), and L>Ll becomes the deviation amount (L-Ll).
このずれ量が大きくなるとベルト補強層重なり部下のベ
ルトエツジに変形が生じタイヤのユニフォミティが悪く
なり耐久性が低下するという問題があった。When this amount of deviation becomes large, there is a problem in that the belt edge under the overlapping belt reinforcing layer is deformed, resulting in poor tire uniformity and reduced durability.
本発明は、ベルト補強層として伸度が異なる複合コード
を用いることで、ベルト補強層の重なり部のずれ量を小
さ（し、もって、タイヤのユニフォミティを向上させ、
かつ、ベルト層のせり上りも抑制できるようにした空気
入りラジアルタイヤを提供することが目的である。The present invention uses composite cords with different elongations as the belt reinforcing layer, thereby reducing the amount of deviation in the overlapping portion of the belt reinforcing layer (thereby improving the uniformity of the tire,
Another object of the present invention is to provide a pneumatic radial tire that can also suppress the rise of the belt layer.
（課題を解決するための手段）
本発明は、トレッド部６に埋設したベルト層５の外周側
に、ベルト補強層７を備えている空気入りラジアルタイ
ヤにおいて、前述の目的を達成するために、次の技術的
手段を講じている。(Means for Solving the Problems) The present invention provides a pneumatic radial tire including a belt reinforcing layer 7 on the outer peripheral side of a belt layer 5 embedded in a tread portion 6. The following technical measures have been taken:
すなわち、本発明は、前記ベルト補強層７は、伸度が異
なる複数のコードを撚合させなる複合コード８よりなり
、該複合コード８は、１．０ ｋｇ荷重時の伸度が２．
５％以上でかつ４．５−荷重時の伸度が９，０％以下で
あることを特徴とするものである。That is, in the present invention, the belt reinforcing layer 7 is composed of a composite cord 8 made by twisting together a plurality of cords having different elongations, and the composite cord 8 has an elongation of 2.0 kg when loaded with 1.0 kg.
It is characterized by having an elongation of 5% or more and a 4.5-load elongation of 9.0% or less.
（実施例と作用）
以下、図面を参照して本発明の実施例と作用を説明する
。(Embodiments and Operations) Hereinafter, embodiments and operations of the present invention will be described with reference to the drawings.
第１図において、１は空気入りラジアルタイヤであり、
左右一対のビード部２にはビードコア３が埋設してあり
、ポリエステル等よりなるラジアル構造のカーカス４が
一方のビードコア３に巻上げられて他方のビードコア３
に向って延伸されかつ巻上げられている。In Fig. 1, 1 is a pneumatic radial tire;
Bead cores 3 are embedded in a pair of left and right bead portions 2, and a carcass 4 having a radial structure made of polyester or the like is wound around one bead core 3 and then wrapped around the other bead core 3.
It is stretched and rolled up.
５はベルト層であり、タイヤ１のトレッド部６に、本例
ではスチールよりなる２枚が埋設されている。Reference numeral 5 denotes a belt layer, and in this example, two belt layers made of steel are embedded in the tread portion 6 of the tire 1.
７はベルト補強層であり、伸度が異なる複数のコードを
撚合せて複合コード８としてなり、該コード８は接着処
理等した例えば、ナイロン繊維とアラミド繊維を撚合せ
て形成されている。Reference numeral 7 denotes a belt reinforcing layer, which is made by twisting together a plurality of cords having different elongations to form a composite cord 8. The cord 8 is formed by twisting, for example, nylon fibers and aramid fibers that have been subjected to an adhesive treatment or the like.
具体的には、ナイロンフィラメントを束ねたヤーンとア
ラミドフィラメント又はポリエステルフィラメントを束
ねたヤーンにそれぞれ下撚りした後に、両者を撚合せて
形成してなり、ここで撚数は、１．０ ｋｇ荷重時の伸
度が２．５％以上で、かつ、４．５睦荷重時の伸度が９
．０％以下となるように適宜設定される。Specifically, it is formed by first twisting a yarn bundled with nylon filaments and a yarn bundled with aramid filaments or polyester filaments, respectively, and then twisting them together, where the number of twists is 1.0 kg at a load of 1.0 kg. The elongation is 2.5% or more, and the elongation at a load of 4.5 mm is 9
．． It is appropriately set to be 0% or less.
ここで、１．０睦荷重時の伸度を２．５％以上としたの
は、２．５％未満であると、ベルト補強層７のジヨイン
ト重なり部のずれを小さくすることができないからであ
る。Here, the reason why the elongation at a load of 1.0 mm is set to 2.5% or more is because if it is less than 2.5%, it is impossible to reduce the deviation of the joint overlap part of the belt reinforcing layer 7. be.
又、４．５ ｋｇ荷重時の伸度を９．０％以下としたの
は、９．０％以上であると、タイヤ走行中のベルト層５
のせり上りを抑制する効果が少なく、高速耐久性が悪化
するからである。In addition, the elongation at a load of 4.5 kg was set to 9.0% or less.If the elongation was 9.0% or more, the belt layer 5
This is because there is little effect in suppressing the build-up, and high-speed durability deteriorates.
更に、ベルト補強層７として伸度が異なる複合コード８
を採用したのは、第２図で示す如＜ 、８４０Ｄ／２の
アラミド繊維単体のコード８−１では、伸度が極端に低
く、一方、８４００／２のナイロン繊維（Ｎ−６，６）
単体のコード８−２では、伸度が極端に高くなるからで
ある。従って、１５００ Ｄのアラミド繊維と２００Ｄ
のナイロン繊維（Ｎ−６，６）を撚合せた複合コード８
を採用しているのである。Furthermore, composite cords 8 having different elongations are used as the belt reinforcing layer 7.
As shown in Figure 2, cord 8-1, which is made of 840D/2 aramid fiber, has extremely low elongation, while cord 8-1, which is made of 840D/2 nylon fiber (N-6,6), has extremely low elongation.
This is because the single cord 8-2 has extremely high elongation. Therefore, 1500D aramid fiber and 200D
Composite cord 8 made of twisted nylon fibers (N-6, 6)
is adopted.
なお、第１図ではタイヤ赤道線０−０より右半分を示し
ているが、左半分は対称である。また、複合コードは伸
度が異なるものの３本以上を撚合せたものでもよい。更
に、ベルト補強層７は２枚を初め複数層でもよい。Although FIG. 1 shows the right half from the tire equator line 0-0, the left half is symmetrical. Moreover, the composite cord may be one in which three or more cords having different elongations are twisted together. Further, the belt reinforcing layer 7 may have two or more layers.
下記に実施例１． ２． ３． ４と比較例１． ２を 例示する。Example 1 is shown below. 2. 3. 4 and comparative example 1. 2 Illustrate.
（次
葉）
但し、上記表において、
タイヤサイズ、Ｔ／Ｌ １７５／７０Ｒ１３８２Ｓカ
ーカス；ポリエステル繊維１５００Ｄ／２ １枚ベルト
層；スチール ｌＸ４Ｘ０．２５ ２枚ベルト補強層；
実施例１〜４ともアラミド繊１ｆｆｌ１５００Ｄとナイ
ロン繊維（ナイロン６．６） ２００Ｄの複合コード
１枚比較例１．２はナイロン６．６ ８４００／２
１枚ユニフォミティ測定法； ＪＩＳ Ｄ ４２０２に
基づき、空気圧−荷重にて測定。(Next page) However, in the above table, tire size, T/L 175/70R1382S carcass; polyester fiber 1500D/2 1 belt layer; steel 1X4X0.25 2 belt reinforcement layer;
Examples 1 to 4 are composite cords of aramid fiber 1ffl1500D and nylon fiber (nylon 6.6) 200D.
1 piece comparative example 1.2 is nylon 6.6 8400/2
Single-sheet uniformity measurement method: Measured under air pressure and load based on JIS D 4202.
高速耐久性測定法、 ＪＩＳ Ｄ ４２３０に基づ（。High-speed durability measurement method, based on JIS D 4230 (.
ユニフォミティ及び高速耐久性は比較例１を１００とし
た指数で表示し、数す吠きい方が良好となる。Uniformity and high-speed durability are expressed as an index with Comparative Example 1 set as 100, and the higher the number, the better.
（発明の効果）
本発明は以上の通りであり、本発明の空気入りラジアル
タイヤによれば、タイヤのユニフォミティを良好にしつ
つ高速耐久性能を向上することができる。(Effects of the Invention) The present invention is as described above, and according to the pneumatic radial tire of the present invention, high-speed durability performance can be improved while improving uniformity of the tire.
第１図は本発明に係るタイヤの右半分の断面図、第２図
は荷重（強力）と伸度との関係グラフ図、第３図（１１
（２）は加硫前後の重なり代（ジヨイント量）の説明図
である。
１・・・タイヤ、４・・・カーカス、５・・・ベルト層
、６・・・トレッド部、７・・・ベルト補強層、８・・
・複合コド。
特 許 出 願 人 オーツタイヤ株式会社日と五し
第
】
図
第
図
イ！／［（％）
図（１）
第
図（２）Fig. 1 is a sectional view of the right half of the tire according to the present invention, Fig. 2 is a graph showing the relationship between load (strong strength) and elongation, and Fig. 3 (11
(2) is an explanatory diagram of the overlap margin (joint amount) before and after vulcanization. DESCRIPTION OF SYMBOLS 1... Tire, 4... Carcass, 5... Belt layer, 6... Tread part, 7... Belt reinforcement layer, 8...
・Compound code. Patent applicant Otsu Tire Co., Ltd. /[(%) Figure (1) Figure (2)
Claims (1)
周側に、ベルト補強層（７）を備えている空気入りラジ
アルタイヤにおいて、 前記ベルト補強層（７）は、伸度が異なる複数のコード
を撚合させなる複合コード（８）よりなり、該複合コー
ド（８）は、１．０ｋｇ荷重時の伸度が２．５％以上で
かつ４．５ｋｇ荷重時の伸度が９．０％以下であること
を特徴とする空気入りラジアルタイヤ。(1) In a pneumatic radial tire comprising a belt reinforcing layer (7) on the outer circumferential side of a belt layer (5) embedded in the tread portion (6), the belt reinforcing layer (7) has different elongations. It consists of a composite cord (8) made by twisting a plurality of cords, and the composite cord (8) has an elongation of 2.5% or more when loaded with 1.0 kg and an elongation of 9 when loaded with 4.5 kg. A pneumatic radial tire characterized by having a pneumatic content of .0% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2188990A JPH03279004A (en) | 1990-03-27 | 1990-07-17 | Pneumatic radial tire |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2-80391 | 1990-03-27 | ||
| JP8039190 | 1990-03-27 | ||
| JP2188990A JPH03279004A (en) | 1990-03-27 | 1990-07-17 | Pneumatic radial tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03279004A true JPH03279004A (en) | 1991-12-10 |
Family
ID=26421406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2188990A Pending JPH03279004A (en) | 1990-03-27 | 1990-07-17 | Pneumatic radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03279004A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0661179A1 (en) * | 1993-12-28 | 1995-07-05 | Sumitomo Rubber Industries Limited | Pneumatic radial tyre |
| JP2016124438A (en) * | 2015-01-05 | 2016-07-11 | 住友ゴム工業株式会社 | Pneumatic tire |
-
1990
- 1990-07-17 JP JP2188990A patent/JPH03279004A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0661179A1 (en) * | 1993-12-28 | 1995-07-05 | Sumitomo Rubber Industries Limited | Pneumatic radial tyre |
| US5558144A (en) * | 1993-12-28 | 1996-09-24 | Sumitomo Rubber Industries, Ltd. | Pneumatic radial tire with hybrid band cord |
| JP2016124438A (en) * | 2015-01-05 | 2016-07-11 | 住友ゴム工業株式会社 | Pneumatic tire |
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