JPH06286406A - Pneumatic tire - Google Patents

Pneumatic tire

Info

Publication number
JPH06286406A
JPH06286406A JP5071995A JP7199593A JPH06286406A JP H06286406 A JPH06286406 A JP H06286406A JP 5071995 A JP5071995 A JP 5071995A JP 7199593 A JP7199593 A JP 7199593A JP H06286406 A JPH06286406 A JP H06286406A
Authority
JP
Japan
Prior art keywords
tire
carcass ply
wires
reinforced
major axis
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
JP5071995A
Other languages
Japanese (ja)
Inventor
Masahiko Yamamoto
雅彦 山本
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.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP5071995A priority Critical patent/JPH06286406A/en
Publication of JPH06286406A publication Critical patent/JPH06286406A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To improve maneuvering stability and durability or the like of a tire by arranging flat cross-sectional reinforced wires formed by covering plural filaments composed of polypara phenylene benzo bisoxazole with nylon in a carcass ply so that the major axis is directed in the circumferential direction of the tire. CONSTITUTION:A pneumatic tire has at least a carcass ply. The carcass ply is reinforced by wires (w). In this case, as for the reinforced wires (w), a cord formed by bundling and intertwisting plural filaments (f) composed of polypara phenylene benzo bisoxazole (PBO) is covered with nylon resin, and a covering layer (n) is formed, and a cross section is formed in a flat structure. The reinforced wires (w) are arranged so that the major axis having a flat cross section can turn in the circumferential direction of the tire. By the way, assuming that the major axis of the reinforced wires (w) is LX, the minor axis is Ly, and (Lydivided by -Lx) is an aspect ratio phi, it is preferable to set this aspect ratio phi, for example, in (1/2<=(phi)<=2/3).

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、空気入りタイヤ、特
に、カーカスプライ補強コードとして有機繊維を使用し
た空気入りタイヤに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire using an organic fiber as a carcass ply reinforcing cord.

【0002】[0002]

【従来に技術】従来、カーカスプライ補強コードとして
ポリエステル(PET)或いはレーヨンフィラメント等
を使用した空気入りタイヤが知られている。
2. Description of the Related Art Conventionally, a pneumatic tire using polyester (PET) or rayon filament as a carcass ply reinforcing cord has been known.

【0003】[0003]

【発明が解決しようとする課題】ポリエステル(PE
T)或いはレーヨンフィラメント等からなるコードは曲
げ剛性が小さいために、このようなコードを補強コード
としたカーカスプライを有する空気入りタイヤは横剛性
が低く、従って、操縦安定性能が劣るという問題があ
る。また、ポリエステル(PET)或いはレーヨンフィ
ラメント等からなるコードはスチールに比べると強度的
に劣り、タイヤの耐サイドカット性能が悪いという問題
がある。
[Problems to be Solved by the Invention] Polyester (PE
T) or a cord made of rayon filament or the like has a small flexural rigidity, so that a pneumatic tire having a carcass ply having such a cord as a reinforcing cord has a low lateral rigidity and therefore has a problem that steering stability performance is poor. . Further, a cord made of polyester (PET) or rayon filament has a problem that its strength is inferior to that of steel, and the side cut resistance of the tire is poor.

【0004】本発明の目的は、上述した従来の空気入り
タイヤが有する課題を解決し、乗心地性能及び燃費性能
を損なうことなく、操縦安定性能及び耐サイドカット性
能等が向上した空気入りタイヤを提供することにある。
An object of the present invention is to solve the problems of the conventional pneumatic tire described above, and to provide a pneumatic tire having improved steering stability and side cut resistance without impairing ride comfort and fuel efficiency. To provide.

【0005】[0005]

【課題を解決するための手段】本発明は、上記の目的を
達成するために、空気入りタイヤが、複数のポリパラフ
ェニレンベンズビスオキサゾール(PBO)フィラメン
トをナイロンで被覆した断面偏平なワイヤーの長径がタ
イヤ周方向に向くように配列されたカーカスプライを有
するように構成したものである。
In order to achieve the above-mentioned object, the present invention provides a pneumatic tire having a long diameter of a flat cross section in which a plurality of polyparaphenylenebenzbisoxazole (PBO) filaments are coated with nylon. Has a carcass ply arranged so as to face the tire circumferential direction.

【0006】以下に、本発明を実施例に基づいて説明す
るが、本発明の趣旨を越えない限り何ら本実施例に限定
されるものではない。図2に示されているように、空気
入りタイヤ(以下、単に、「タイヤ」ともいう。)1
は、ビード部2、カーカスプライ3、ベルト4’及び
4”の2層からなるベルト部4及びトレッド部5とから
構成されている。カーカスプライ3とトレッド部5間に
配置されているベルト部4は、カーカスプライ3の放射
方向への膨張を抑える、所謂、タガとしての作用をして
いる。また、6はショルダー部である。
The present invention will be described below based on examples, but the present invention is not limited to these examples without departing from the gist of the present invention. As shown in FIG. 2, a pneumatic tire (hereinafter, also simply referred to as “tire”) 1
Is composed of a bead portion 2, a carcass ply 3, and a belt portion 4 and a tread portion 5 each having two layers of belts 4 ′ and 4 ″. A belt portion arranged between the carcass ply 3 and the tread portion 5. Reference numeral 4 serves as a so-called hoop that suppresses expansion of the carcass ply 3 in the radial direction, and 6 is a shoulder portion.

【0007】カーカスプライ3の補強ワイヤーWは、補
強ワイヤーWの断面図である図1に示されているよう
に、ポリパラフェニレンベンズビスオキサゾール(以
下、単に、「PBO」という。)フィラメントfを複数
本束ねて撚合したコードをナイロン樹脂で被覆して被覆
層nを形成するとともに断面が偏平に成形された構造を
有し、しかも、このような構造を有する補強ワイヤーW
は、断面偏平な補強ワイヤーWの長径がタイヤの周方向
に向くように配列される。
The reinforcing wire W of the carcass ply 3 comprises a polyparaphenylenebenzbisoxazole (hereinafter simply referred to as "PBO") filament f, as shown in FIG. 1 which is a sectional view of the reinforcing wire W. A reinforcing wire W having a structure in which a plurality of bundled and twisted cords are covered with a nylon resin to form a covering layer n and the cross section is formed flat, and which has such a structure.
Are arranged so that the major axis of the reinforcing wire W having a flat cross section is oriented in the circumferential direction of the tire.

【0008】また、カーカスプライ補強ワイヤーWを構
成するフィラメントfとして高強度、高弾性のPBOフ
ィラメントを用いたことにより、カーカスプライ補強ワ
イヤーWの総デニール数を少なくすることができるので
タイヤを軽量化することができ、また、ヒステリシスロ
スが少ないのでタイヤの軽量化と相まって転がり抵抗を
減少させることができるとともにカーカスプライ3の耐
サイドカット性を向上することができる。
Further, by using a high-strength, high-elasticity PBO filament as the filament f constituting the carcass ply reinforcing wire W, the total denier of the carcass ply reinforcing wire W can be reduced, so that the weight of the tire is reduced. Since the hysteresis loss is small, the rolling resistance can be reduced in combination with the weight reduction of the tire, and the side cut resistance of the carcass ply 3 can be improved.

【0009】図1に示されているように、断面偏平なカ
ーカスプライ補強ワイヤーWの長径をLx、短径をLy
とし、Ly÷Lxをアスペクト比φと定義した場合に、
アスペクト比φは、1/2≦φ≦2/3であることが好
ましい。アスペクト比φが1/2未満の場合には、カー
カスプライ補強ワイヤーWの間隔が狭くなり、カーカス
プライ3でのセパレーションが起こり易くなりビード耐
久性能が悪化することになる。また、アスペクト比φが
2/3を越えるとサイド部面内曲剛性が不足し操縦安定
性能が悪くなり、かつ、サイド部面外曲剛性が大きくな
りすぎて乗心地性能を損なう。
As shown in FIG. 1, the long diameter of the carcass ply reinforcing wire W having a flat cross section is Lx, and the short diameter thereof is Ly.
When Ly ÷ Lx is defined as the aspect ratio φ,
The aspect ratio φ is preferably 1/2 ≦ φ ≦ 2/3. When the aspect ratio φ is less than 1/2, the interval between the carcass ply reinforcing wires W becomes narrow, separation is likely to occur in the carcass ply 3, and the bead durability performance deteriorates. If the aspect ratio φ exceeds 2/3, the side part in-plane bending rigidity becomes insufficient, the steering stability performance deteriorates, and the side part out-side bending rigidity becomes too large, which impairs riding comfort performance.

【0010】[0010]

【実施例】表1には、本発明の実施例と比較例について
の操縦安定性能評価、振動乗心地性能評価、BFドラム
試験及び耐サイドカット性指数の試験結果及びカーカス
プライの構造等が示されている。試験に使用されたタイ
ヤサイズは175/70R13であり、操縦安定性能評
価、振動乗心地性能評価、BFドラム試験及び耐サイド
カット性指数の試験方法は以下に示す通りである。
[Examples] Table 1 shows the steering stability performance evaluation, vibration riding comfort performance evaluation, BF drum test and side cut resistance index test results, and carcass ply structure, etc. for Examples and Comparative Examples of the present invention. Has been done. The tire size used in the test is 175 / 70R13, and the test methods of steering stability performance evaluation, vibration riding comfort performance evaluation, BF drum test, and side cut resistance index are as shown below.

【0011】〔操縦安定性能評価及び振動乗心地性能評
価〕各試作タイヤを乗用車に装着し、専門のドライバー
により操縦安定性能と振動乗心地性能のフィーリングテ
ストを行った。評価はコントロールタイヤを5とした1
0点法の相対評価にてコントロール対比で、 0:変わらない ±2:やや良い(やや悪い) ±4:良い(悪い) と区別した。なお、+のタイヤは操縦安定性能或いは振
動乗心地性能がコントロールタイヤより良いことを示し
ている。
[Evaluation of Steering Stability Performance and Vibration Ride Comfort Performance] Each trial tire was mounted on a passenger car, and a feeling test of steering stability performance and vibration ride comfort performance was conducted by a professional driver. The evaluation was set to 5 for the control tire 1
It was distinguished from the control by the relative evaluation of the 0-point method: 0: unchanged ± 2: somewhat good (somewhat bad) ± 4: good (bad). It should be noted that the + tire indicates that the steering stability performance or vibration riding comfort performance is better than that of the control tire.

【0012】〔BFドラム試験〕試作タイヤを25±2
°Cの室内中で内圧3.0kg/cm2 に調整した後、
24時間放置後、空気圧の再調整を行い、JIS荷重の
2倍荷重をタイヤに負荷し、直径約3mのドラム上で速
度60km/時で2万km走行させた。
[BF Drum Test] A trial tire of 25 ± 2
After adjusting the internal pressure to 3.0 kg / cm 2 in the room at ° C,
After standing for 24 hours, the air pressure was readjusted, a load twice the JIS load was applied to the tire, and the tire was run on a drum having a diameter of about 3 m at a speed of 60 km / hour for 20,000 km.

【0013】〔耐サイドカット指数〕テストタイヤを車
両に装着し、高さ120mm,角部曲率半径20mmの
垂直に切り立った縁石に向かって、速度15km/hで
進入角度15度の方向から乗り上げた。同一テストタイ
ヤにつきその内圧を3kg/cm2 から0.1kg/c
2 づつ下げて実施し、サイド部のカットバーストが発
生した内圧p(kg/cm2 )を求めた。内圧p以下で
は、サイド部が撓み易くすべてカットバーストが起きる
ので、従って、内圧pが低いほど耐サイドカット性が良
好であり、逆に、内圧pが高いほどカットバーストが起
こり易く、耐サイドカット性が悪いと判断した。コント
ロールタイヤ(比較例1)の内圧をp0 とし、この内圧
0 に対してテストタイヤの内圧をp1 とした場合に、
耐サイドカット性指数(As)は式 As=p0 ÷p1 ×100 で表すことができる。かかる試験は、3本の同一タイヤ
についてそれぞれ行い、3本の平均された内圧pを基に
耐サイドカット指数を求めた。
[Side-Cut Resistance Index] A test tire was mounted on a vehicle, and was run at a speed of 15 km / h from an approach angle of 15 degrees toward a vertically raised curb having a height of 120 mm and a corner radius of curvature of 20 mm. . The internal pressure of the same test tire is 3kg / cm 2 to 0.1kg / c
The test was carried out by lowering m 2 by m 2 and the internal pressure p (kg / cm 2 ) at which the cut burst of the side part occurred was determined. Below the internal pressure p, the side portions are easily bent and all cut bursts occur. Therefore, the lower the internal pressure p, the better the side cut resistance, and conversely, the higher the internal pressure p, the easier the cut burst occurs and the side cut resistance. It was judged that the sex was bad. When the internal pressure of the control tire (Comparative Example 1) is p 0 and the internal pressure of the test tire is p 1 with respect to this internal pressure p 0 ,
The side cut resistance index (As) can be represented by the formula As = p 0 ÷ p 1 × 100. This test was performed for each of the three same tires, and the side cut resistance index was obtained based on the averaged internal pressure p of the three tires.

【0014】[0014]

【表1】 [Table 1]

【0015】比較例1のものは、カーカスプライ補強ワ
イヤーWの材料がPETであり、実施例1〜4のものに
比べ、操縦安定性能及び耐サイドカット性が悪い。比較
例2のものは、カーカスプライ補強ワイヤーWの材料が
PBOであるがナイロンで被覆されておらず、実施例1
〜4のものに比べ、耐サイドカット性が悪い。比較例3
のものは、実施例1〜4と同様のカーカスプライ補強ワ
イヤーWを使用しているが、アスペクト比φが本発明の
好ましい範囲の下限未満のものであり、実施例1〜4の
ものに比べ、BFドラム試験の結果が非常に悪く、ま
た、耐サイドカット性も悪い。本発明の実施例1〜4の
ものは、比較例1〜3のものに比べ、操縦安定性能、耐
久性能及び耐サイドカット性等が高度のレベルでバラン
スされていることがわかる。
In Comparative Example 1, the material of the carcass ply reinforcing wire W is PET, and the steering stability and side cut resistance are poorer than those in Examples 1 to 4. In Comparative Example 2, the material of the carcass ply reinforcing wire W is PBO, but it is not coated with nylon.
The side cut resistance is poorer than those of ~ 4. Comparative Example 3
The same carcass ply reinforcing wire W as in Examples 1 to 4 is used, but the aspect ratio φ is less than the lower limit of the preferred range of the present invention, and compared with those in Examples 1 to 4. , BF drum test results are very poor, and side cut resistance is also poor. It can be seen that in Examples 1 to 4 of the present invention, steering stability performance, durability performance, side cut resistance, and the like are balanced at a high level as compared with Comparative Examples 1 to 3.

【0016】[0016]

【発明の効果】本発明は、以上説明したように構成され
ているので、以下に記載されるような効果を奏する。
Since the present invention is constructed as described above, it has the following effects.

【0017】断面偏平なカーカスプライ補強ワイヤーの
長径がタイヤ周方向に向くように配置したこと及びカー
カスプライ補強ワイヤーのフィラメントとして高強度、
高弾性のPBOフィラメントを用いたことの相乗によ
り、操縦安定性能、耐久性能及び耐サイドカット性等が
高度のレベルでバランスされた空気入りタイヤを実現す
ることができる。
The carcass ply reinforcing wire having a flat cross section is arranged so that its major axis is oriented in the tire circumferential direction, and the carcass ply reinforcing wire has high strength as a filament.
The synergy of using the highly elastic PBO filament makes it possible to realize a pneumatic tire in which steering stability performance, durability performance, side cut resistance, etc. are balanced at a high level.

【図面の簡単な説明】[Brief description of drawings]

【図1】図1は本発明のカーカスプライ補強ワイヤーの
断面図である。
FIG. 1 is a cross-sectional view of a carcass ply reinforcing wire according to the present invention.

【図2】図2は空気入りタイヤの半径方向断面図であ
る。
FIG. 2 is a radial cross-sectional view of a pneumatic tire.

【符号の説明】[Explanation of symbols]

1・・・・・・・空気入りタイヤ 2・・・・・・・ビード部 3・・・・・・・カーカスプライ 4・・・・・・・ベルト部 5・・・・・・・トレッド部 C・・・・・・・カーカスプライ補強ワイヤー f・・・・・・・PBOフィラメント 1 ・ ・ Pneumatic tire 2 ・ ・ ・ ・ Bead part 3 ・ ・ ・ ・ ・ ・ Carcass ply 4 ・ ・ ・ ・ ・ ・ Belt part 5 ・ ・ ・ ・ ・ ・ Tread Part C: Carcass ply reinforcing wire f: PBO filament

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】複数のポリパラフェニレンベンズビスオキ
サゾール(PBO)フィラメントをナイロンで被覆した
断面偏平なワイヤーの長径がタイヤ周方向に向くように
配列されたカーカスプライを有することを特徴とする空
気入りタイヤ。
1. A pneumatic in which a plurality of polyparaphenylenebenzbisoxazole (PBO) filaments are coated with nylon and which has a carcass ply arranged so that the major axis of a wire having a flat cross section is oriented in the tire circumferential direction. tire.
JP5071995A 1993-03-30 1993-03-30 Pneumatic tire Pending JPH06286406A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5071995A JPH06286406A (en) 1993-03-30 1993-03-30 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5071995A JPH06286406A (en) 1993-03-30 1993-03-30 Pneumatic tire

Publications (1)

Publication Number Publication Date
JPH06286406A true JPH06286406A (en) 1994-10-11

Family

ID=13476574

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5071995A Pending JPH06286406A (en) 1993-03-30 1993-03-30 Pneumatic tire

Country Status (1)

Country Link
JP (1) JPH06286406A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06286412A (en) * 1993-03-30 1994-10-11 Bridgestone Corp Pneumatic tire
JP2006069390A (en) * 2004-09-02 2006-03-16 Bridgestone Corp Pneumatic radial tire for high-speed heavy load
FR3051485A1 (en) * 2016-05-18 2017-11-24 Michelin & Cie REINFORCING ELEMENT FOR BANDING, REINFORCED PRODUCT COMPRISING SUCH REINFORCING ELEMENT, BANDAGE COMPRISING SUCH REINFORCING ELEMENT OR REINFORCED PRODUCT, AND METHOD FOR MANUFACTURING SUCH REINFORCING ELEMENT
CN113853309A (en) * 2019-06-05 2021-12-28 住友橡胶工业株式会社 Cord and tire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06286412A (en) * 1993-03-30 1994-10-11 Bridgestone Corp Pneumatic tire
JP2006069390A (en) * 2004-09-02 2006-03-16 Bridgestone Corp Pneumatic radial tire for high-speed heavy load
FR3051485A1 (en) * 2016-05-18 2017-11-24 Michelin & Cie REINFORCING ELEMENT FOR BANDING, REINFORCED PRODUCT COMPRISING SUCH REINFORCING ELEMENT, BANDAGE COMPRISING SUCH REINFORCING ELEMENT OR REINFORCED PRODUCT, AND METHOD FOR MANUFACTURING SUCH REINFORCING ELEMENT
CN113853309A (en) * 2019-06-05 2021-12-28 住友橡胶工业株式会社 Cord and tire

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