JPS62292506A - Radial-ply tire - Google Patents

Radial-ply tire

Info

Publication number
JPS62292506A
JPS62292506A JP61136084A JP13608486A JPS62292506A JP S62292506 A JPS62292506 A JP S62292506A JP 61136084 A JP61136084 A JP 61136084A JP 13608486 A JP13608486 A JP 13608486A JP S62292506 A JPS62292506 A JP S62292506A
Authority
JP
Japan
Prior art keywords
tire
reinforcing layer
load
cord
cord reinforcing
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
Application number
JP61136084A
Other languages
Japanese (ja)
Inventor
Atsunori Agari
上利 篤範
Shuji Takahashi
修二 高橋
Shinji Miyazaki
宮崎 進司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP61136084A priority Critical patent/JPS62292506A/en
Publication of JPS62292506A publication Critical patent/JPS62292506A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To improve the extent of steering stability without entailing any drop in high-speed durability, by making a specified relationship so as to be realized between a central zone in the tire width direction of a cord reinforced layer and a double side end zone as well as between elongation percentages at the time of the specified load. CONSTITUTION:When an elongation percentage at the time of 2g/d load in a central zone B i the tire width direction of a cord reinforced layer 2 is set down to (b) and an elongation percentage at the time of 2g/d load in double end zone A to (a), respectively, the relation between both zones A and B of the cord reinforced layer 2 is set to make b/a larger than 1.10 within the range of (1/10)<A/(2A+B)<(1/3). With this constitution, the extent of steering stability is improvable without entailing any drop in high-speed durability.

Description

【発明の詳細な説明】 3、発明の詳細な説明 〔発明の技術分野〕 本発明は、高速耐久性を低下させることな(t、dU安
定性を向上させたラジアルタイヤに関する。
Detailed Description of the Invention 3. Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a radial tire with improved dU stability without reducing high-speed durability.

〔従来技術〕[Prior art]

従来、ベルトエツジセパレーションに起因する高速耐久
性低下の防止対策として、ショルダ一部を1〜2枚のコ
ード補強層で覆う方法が知られているが、この方法では
タイヤの均一性が悪化してしまう。そこで、ショルダ一
部のみでなくベルト部全体をコード補楠層で覆う方法が
提案されている。この−例を第4図〜第6図に示す。第
4図では、ベルト層1の全体をIFfのコード補強層2
で覆っている。第5図では、ベルト層1のショルダ一部
をコード補強層2゛で覆うと共に全体を1層のコード補
強層2で覆っている。第6図では、ベルト層1の全体を
2層のコード補強層2で覆っている。
Conventionally, as a measure to prevent the decline in high-speed durability caused by belt edge separation, a method has been known to cover part of the shoulder with one or two cord reinforcement layers, but this method deteriorates the uniformity of the tire. Put it away. Therefore, a method has been proposed in which not only a portion of the shoulder but also the entire belt portion is covered with a cord polishing layer. Examples of this are shown in FIGS. 4-6. In FIG. 4, the entire belt layer 1 is covered with an IFf cord reinforcement layer 2.
covered with In FIG. 5, a part of the shoulder of the belt layer 1 is covered with a cord reinforcing layer 2'', and the whole is covered with one layer of the cord reinforcing layer 2. In FIG. 6, the entire belt layer 1 is covered with two cord reinforcing layers 2.

しかしながら、本発明者らの実験によると、これらの第
4図〜第6図に示される方法では、操縦安定性が低下す
るという欠点があることが見い出された。この原因を検
討した結果、タイヤ幅方向センター周辺部にも高剛性の
コード補強層が配置されるのでタイヤ踏面の剛性が上り
すぎ、タイヤ踏面の接地性が低下するのが原因であるこ
とが判った。
However, according to experiments conducted by the present inventors, it has been found that the methods shown in FIGS. 4 to 6 have a drawback in that steering stability is reduced. As a result of investigating the cause, we found that the cause was that a high-rigidity cord reinforcing layer was also placed around the center in the width direction of the tire, which increased the rigidity of the tire tread too much and reduced the ground contact of the tire tread. Ta.

〔発明の目的〕[Purpose of the invention]

本発明は、これら諸知見に基づいてなされたものであっ
て、ショルダ一部については従来のコード補強層を使用
して高速耐久性、耐ベルトセパレーション性を維持させ
、センター周辺部には従来のコード補強層よりも伸び率
の大きなコード補強層を使用することにより、高速耐久
性を低下させることなく操縦安定性を向上させ得たラジ
アルタイヤを提供することを目的とする。
The present invention has been made based on these findings, and uses a conventional cord reinforcing layer in the shoulder part to maintain high-speed durability and belt separation resistance, and uses the conventional cord reinforcement layer in the center area to maintain high-speed durability and belt separation resistance. An object of the present invention is to provide a radial tire in which handling stability can be improved without reducing high-speed durability by using a cord reinforcing layer having a higher elongation rate than the cord reinforcing layer.

〔発明の構成〕[Structure of the invention]

このため、本発明は、ベルト層の上に、該ベルト層の全
幅に亘って少なくとも1層のコード補強層をタイヤ周方
向に環状に配置したラジアルタイヤにおいて、前記コー
ド補強層のタイヤ幅方向中央域Bにおける2 g / 
d荷重時の伸び率をbとし、該コード補強層のタイヤ幅
方向両端域Aにおける2g/d荷重時の伸び率をaとし
た場合に、該コード補強層が(1/10) <A/ (
2A+B)< (1/3)の範囲にて(b/a) >1
.10を満足することを特徴とするラジアルタイヤを要
旨とするものである。
For this reason, the present invention provides a radial tire in which at least one cord reinforcing layer is arranged annularly in the tire circumferential direction on the belt layer over the entire width of the belt layer. 2 g/in area B
If the elongation rate under a load of d is b, and the elongation rate at a load of 2 g/d at both end areas A in the tire width direction of the cord reinforcement layer is a, then the cord reinforcement layer has a ratio of (1/10) <A/ (
2A+B)<(b/a)>1 in the range of (1/3)
.. The gist of this invention is a radial tire that satisfies the following.

以下、図を参照して本発明の構成につき詳しく説明する
Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.

第1図〜第3図は、それぞれ、本発明ラジアルタイヤの
ベルト部の一例を示す説明図である。
FIGS. 1 to 3 are explanatory diagrams each showing an example of the belt portion of the radial tire of the present invention.

第1図は第4図の構造に相当し、第2図は第5図の構造
に相当し、第3図は第6図の構造に相当する。
1 corresponds to the structure in FIG. 4, FIG. 2 corresponds to the structure in FIG. 5, and FIG. 3 corresponds to the structure in FIG. 6.

これら第1図〜第3図において、Aはコード補強層2の
タイヤ幅方向両端域である。また、Bはコード補強層2
のタイヤ幅方向中央域である。
In FIGS. 1 to 3, A indicates both end regions of the cord reinforcing layer 2 in the tire width direction. In addition, B is the cord reinforcement layer 2
This is the center area in the width direction of the tire.

本発明においては、コード補強層2のタイヤ幅方向中央
域Bにおける2 g/d荷重時の伸び率をbとし、コー
ド補強層2のタイヤ幅方向両端域Aにおける2g/d荷
重時の伸び率をaとした場合に、コード補強層2が(1
/10) <A/ (2A+B)< (1/3)の範囲
にて(b/a) >1.10を満足するとしている。こ
れは、本発明者らの実験結果により定められたのである
In the present invention, the elongation rate at a load of 2 g/d in the central area B in the tire width direction of the cord reinforcing layer 2 is defined as b, and the elongation rate at the load of 2 g/d in both end areas A in the tire width direction of the cord reinforcing layer 2 is defined as b. When is a, the cord reinforcing layer 2 is (1
/10) <A/ (2A+B)< (1/3), it is assumed that (b/a) >1.10 is satisfied. This was determined by the experimental results of the present inventors.

ここで、2g/d荷重時の伸び率とは、コード補強層に
用いられるコードに1デニール当り2gの荷重を加えた
場合のコードの伸び率をいう。
Here, the elongation rate at a load of 2 g/d refers to the elongation rate of the cord when a load of 2 g per denier is applied to the cord used for the cord reinforcing layer.

例えば、840 D /2のコードを用いた場合、84
0 x2 x2 =3360gの荷重を加えた時の伸び
率である。
For example, when using a code of 840 D /2, 84
0 x2 x2 = elongation rate when a load of 3360 g is applied.

なお、第1図〜第3図では、コード補強層2をA、B、
Aに3分割したが、AI 、A? 、B、A2、AIと
いうように5分割あるいはそれ以上に分割してもよい。
In addition, in FIGS. 1 to 3, the cord reinforcing layer 2 is A, B,
I divided it into three A, but AI, A? , B, A2, AI, etc., or may be divided into five or more.

この場合、ショルダ一部からセンタ一部に移行するにつ
れてコード補強層2の伸び率を次第に大きくするとよい
In this case, it is preferable to gradually increase the elongation rate of the cord reinforcing layer 2 as it moves from part of the shoulder to part of the center.

つぎに、第2図に示すベルト部構造にて行った実験結果
を示す。
Next, the results of an experiment conducted using the belt structure shown in FIG. 2 will be shown.

評価タイヤサイズ: 205 /60 R1487H,
リム: 6−JJ X 14゜コード補強層は66ナイ
ロン 840D /2のコードを使用。評価項目:■高
速耐久性ドラム試験(FMVSS #109高速試験延
長)、■操縦安定性フィーリング評価。
Evaluation tire size: 205 /60 R1487H,
Rim: 6-JJ Evaluation items: ■High-speed durability drum test (FMVSS #109 high-speed test extension), ■Driving stability feeling evaluation.

(1)  実験l。(1) Experiment l.

A/ (2A+B)の範囲についての実験。Experiment on the range of A/(2A+B).

(以下余白) 評11劃果 ■ 高速耐久性ドラム試験。(Margin below) Evaluation 11 results ■ High-speed durability drum test.

試作品1・・・・217km /h x 2公試作品2
・・・・225km/h×24分試作品3・・・・22
5km/h×29分試作品4・・・・225km / 
h X 22分従来品 ・・・・225km /h x
25分■ 操縦安定性フィーリング評価(指数表示、指
数は大きい方が良い)。
Prototype 1...217km/h x 2 Public trial product 2
...225km/h x 24 minutes Prototype 3...22
5km/h x 29 minutes Prototype 4...225km /
h x 22 minutes Conventional product...225km/h x
25 minutes ■ Steering stability feeling evaluation (index display, the larger the index, the better).

試作品1・・・・114 試作品2・・・・114 試作品3・・・・108 試作品4・・・・ 98 従来品 ・・・・100 上記結果から、A/ (2A+B)の値が請求範囲より
小さすぎると高速耐久性が従来品より劣り、請求範囲よ
り大きすぎると操縦安定性フィーリングが向上しないと
いうことが判る。
Prototype 1...114 Prototype 2...114 Prototype 3...108 Prototype 4...98 Conventional product...100 From the above results, the value of A/ (2A+B) If it is too small than the claimed range, the high-speed durability will be inferior to conventional products, and if it is too large than the claimed range, the handling stability feeling will not improve.

(2)実験2゜ (b / a )の範囲についての実験。(2) Experiment 2゜ Experiment on the range of (b/a).

(以下余白) 評10劃果 ■ 高速耐久性ドラム試験。(Margin below) Rating 10 results ■ High-speed durability drum test.

試作品5・・・・209kra/h×5分従来品 ・・
・・225km / h x 25分試作品6・・・・
209に涌/h×7公試作品7・・・・217km/h
x19分試作品2・・・・225km/h×24分■ 
操縦安定性フィーリング評価(指数表示、指数は大きい
方が良い)。
Prototype 5...209kra/h x 5 minutes Conventional product...
・・225km/h x 25 minutes Prototype 6・・・・
209 ni Waku/h x 7 public trial work 7...217km/h
x 19 minutes Prototype 2...225km/h x 24 minutes■
Maneuvering stability feeling evaluation (index display, the larger the index, the better).

試作品5・・・・ 95 従来品 ・・・・100 試作品6・・・・116 試作品7・・・・109 試作品2・・・・114 上記結果から、(b/a)の値が従来品より小さいと操
縦安定性フィーリングは劣り、A/(2A+B)、(b
/a)共に請求範囲内であれば高速耐久性を低下させる
ことな(操縦安定性を向上させることができるというこ
とが判る。
Prototype 5...95 Conventional product...100 Prototype 6...116 Prototype 7...109 Prototype 2...114 From the above results, the value of (b/a) If it is smaller than the conventional product, the steering stability feeling will be inferior, and A/(2A+B), (b
/a) It can be seen that if both are within the claimed range, high-speed durability is not reduced (handling stability can be improved).

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明によれば、高速耐久性を低下
させることなく操縦安定性を十分に向上させることが可
能となる。
As explained above, according to the present invention, it is possible to sufficiently improve steering stability without reducing high-speed durability.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図〜第3図はそれぞれ本発明ラジアルタイヤのベル
ト部の一例を示す説明図、第4図〜第6図はそれぞれ従
来のラジアルタイヤのベルト部の一例を示す説明図であ
る。 l・・・ベルト層、2・・・コード補強層。
FIGS. 1 to 3 are explanatory diagrams each showing an example of a belt portion of a radial tire of the present invention, and FIGS. 4 to 6 are explanatory diagrams each showing an example of a belt portion of a conventional radial tire. l...belt layer, 2...cord reinforcing layer.

Claims (1)

【特許請求の範囲】[Claims] ベルト層の上に、該ベルト層の全幅に亘って少なくとも
1層のコード補強層をタイヤ周方向に環状に配置したラ
ジアルタイヤにおいて、前記コード補強層のタイヤ幅方
向中央域Bにおける2g/d荷重時の伸び率をbとし、
該コード補強層のタイヤ幅方向両端域Aにおける2g/
d荷重時の伸び率をaとした場合に、該コード補強層が
(1/10)<A/(2A+B)<(1/3)の範囲に
て(b/a)>1.10を満足することを特徴とするラ
ジアルタイヤ。
In a radial tire in which at least one cord reinforcing layer is arranged annularly in the tire circumferential direction on the belt layer over the entire width of the belt layer, a 2 g/d load in the central region B in the tire width direction of the cord reinforcing layer. Let b be the elongation rate over time,
2g/in both end areas A in the tire width direction of the cord reinforcing layer
d When the elongation rate under load is a, the cord reinforcing layer satisfies (b/a)>1.10 in the range of (1/10)<A/(2A+B)<(1/3). A radial tire that is characterized by:
JP61136084A 1986-06-13 1986-06-13 Radial-ply tire Pending JPS62292506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61136084A JPS62292506A (en) 1986-06-13 1986-06-13 Radial-ply tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61136084A JPS62292506A (en) 1986-06-13 1986-06-13 Radial-ply tire

Publications (1)

Publication Number Publication Date
JPS62292506A true JPS62292506A (en) 1987-12-19

Family

ID=15166875

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61136084A Pending JPS62292506A (en) 1986-06-13 1986-06-13 Radial-ply tire

Country Status (1)

Country Link
JP (1) JPS62292506A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0382603A (en) * 1989-08-01 1991-04-08 Sumitomo Rubber Ind Ltd Radial tire
JPH0431107A (en) * 1990-05-28 1992-02-03 Toyo Tire & Rubber Co Ltd Radial tire
US5213642A (en) * 1989-05-31 1993-05-25 Sp Reifenwerke Gmbh Vehicle tire including a breaker reinforcement layer comprising overlapping bandage strips
JP2006151336A (en) * 2004-12-01 2006-06-15 Yokohama Rubber Co Ltd:The Pneumatic tire for heavy load
JP2006199224A (en) * 2005-01-24 2006-08-03 Sumitomo Rubber Ind Ltd Run-flat tire
JP2006213278A (en) * 2005-02-07 2006-08-17 Yokohama Rubber Co Ltd:The Pneumatic tire, and its manufacturing method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54126305A (en) * 1978-03-09 1979-10-01 Pirelli Pneumatic tire

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54126305A (en) * 1978-03-09 1979-10-01 Pirelli Pneumatic tire

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213642A (en) * 1989-05-31 1993-05-25 Sp Reifenwerke Gmbh Vehicle tire including a breaker reinforcement layer comprising overlapping bandage strips
JPH0382603A (en) * 1989-08-01 1991-04-08 Sumitomo Rubber Ind Ltd Radial tire
JPH0431107A (en) * 1990-05-28 1992-02-03 Toyo Tire & Rubber Co Ltd Radial tire
JP2006151336A (en) * 2004-12-01 2006-06-15 Yokohama Rubber Co Ltd:The Pneumatic tire for heavy load
JP2006199224A (en) * 2005-01-24 2006-08-03 Sumitomo Rubber Ind Ltd Run-flat tire
JP2006213278A (en) * 2005-02-07 2006-08-17 Yokohama Rubber Co Ltd:The Pneumatic tire, and its manufacturing method
JP4635634B2 (en) * 2005-02-07 2011-02-23 横浜ゴム株式会社 Pneumatic tire and manufacturing method thereof

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