JPH09142101A - Pneumatic radial tire - Google Patents
Pneumatic radial tireInfo
- Publication number
- JPH09142101A JPH09142101A JP7301657A JP30165795A JPH09142101A JP H09142101 A JPH09142101 A JP H09142101A JP 7301657 A JP7301657 A JP 7301657A JP 30165795 A JP30165795 A JP 30165795A JP H09142101 A JPH09142101 A JP H09142101A
- Authority
- JP
- Japan
- Prior art keywords
- belt
- tire
- cord
- twist
- reinforcing layer
- 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 abstract description 32
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 239000011324 bead Substances 0.000 claims description 7
- 229920000297 Rayon Polymers 0.000 claims description 6
- 239000002964 rayon Substances 0.000 claims description 6
- 229920006122 polyamide resin Polymers 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229920000126 latex Polymers 0.000 description 4
- 239000004816 latex Substances 0.000 description 4
- 229920002292 Nylon 6 Polymers 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000013256 coordination polymer Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 229920003189 Nylon 4,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 1
- 229960001755 resorcinol Drugs 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Landscapes
- Tires In General (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、有機繊維の双撚り
糸をベルト補層コードに使用した空気入りタイヤに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire in which a double-twisted yarn of organic fiber is used for a belt auxiliary layer cord.
【0002】[0002]
【従来の技術】従来、タイヤのベルト補強層コードにポ
リアミドなどの有機樹脂繊維を使用するとき、通常、下
撚り数n1 と、上撚り数n2 とが等しい、いわゆるバラ
ンス撚りコード、または、下撚り数n1 =0のいわゆる
片撚りコードのみが、ベルト内の幅方向の位置にかかわ
らず、用いられてきた。また、最近の傾向として、ベル
ト端部の歪を抑えるために、低撚り数化による高モジュ
ラスコードを用いることが多くなってきた。しかし、こ
のようなコードの場合は、タイヤ高速回転時の径成長を
抑制するための高引張剛性と径成長によるコードへの引
張入力をコードが破断することなく吸収するための高伸
度とをともに向上させることは困難であった。2. Description of the Related Art Conventionally, when an organic resin fiber such as polyamide is used for a belt reinforcing layer cord of a tire, a so-called balanced twist cord, in which the lower twist number n 1 and the upper twist number n 2 are usually equal, or Only so-called single-twisted cords having a lower twist number n 1 = 0 have been used regardless of the position in the width direction of the belt. In addition, as a recent tendency, in order to suppress the distortion at the belt end portion, a high modulus cord by reducing the number of twists has been often used. However, in the case of such a cord, a high tensile rigidity for suppressing the diameter growth during high-speed rotation of the tire and a high elongation for absorbing the tensile input to the cord due to the diameter growth without breaking the cord are provided. It was difficult to improve both.
【0003】そこで、本発明者らは、下撚り係数N1 と
上撚り係数N2 の比N2 /N1 を(D2 /D1 )1/2 よ
り大きく8以下とし、さらに、上撚り係数を0.68未
満とすることにより上記問題を解決することができるこ
とを見い出した(特開閉7−237406号)。Therefore, the present inventors set the ratio N 2 / N 1 of the lower twisting coefficient N 1 and the upper twisting coefficient N 2 to be greater than (D 2 / D 1 ) 1/2 and 8 or less, and further It has been found that the above problem can be solved by setting the coefficient to less than 0.68 (No. 7-237406).
【0004】しかし、このような方法では、ベルト内の
幅方向の位置にかかわらず、全幅に一種類のコードが用
いられていたために、ベルト端歪を抑えることを主目的
とするあまり、タイヤ幅方向においてセンター部よりも
ショルダー部の周方向剛性が相対的に高くなり、センタ
ー接地長に対するショルダー接地長が短くなり、操縦安
定性が低下してしまう、また、タイヤ全幅において、周
方向剛性の絶対値が高くなりすぎるために、振動乗り心
地性が低下してしまうといった問題が起こる可能性があ
ることがわかった。However, in such a method, since one kind of cord is used for the entire width regardless of the position in the width direction of the belt, the main purpose is to suppress the belt end strain, and the tire width is too large. In the direction of the shoulder, the circumferential rigidity of the shoulder portion is relatively higher than that of the center portion, the shoulder ground contact length with respect to the center ground contact length is reduced, and steering stability is reduced. It was found that there is a possibility that the vibration riding comfort may be deteriorated because the value becomes too high.
【0005】以上のことに鑑み、本発明者は、空気入り
タイヤのベルト補強層コードに使用する双撚り糸の上撚
り数と下撚り数の関係、及び、タイヤの構造の及ぼす影
響を研究し、上撚り係数及び下撚り数と上撚り数の比、
および、ベルト幅方向内での上撚り係数を変えることに
より上述の問題を解決することを見い出し、本発明に至
った。In view of the above, the present inventor has studied the relationship between the number of upper twists and the number of lower twists of a twin twist yarn used for a belt reinforcing layer cord of a pneumatic tire, and the influence of the tire structure, Upper twist coefficient and ratio of number of lower twists and number of upper twists,
Further, they have found that the above problem can be solved by changing the twisting coefficient in the belt width direction, and have reached the present invention.
【0006】[0006]
【発明が解決しようとする課題】本発明の目的は、タイ
ヤ耐久性能を低下させることなくベルト補強層コードの
耐疲労性を保持しつつ、タイヤの振動乗り心地性と操縦
安定性を高めた空気入りタイヤを提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to maintain the fatigue resistance of a belt reinforcing layer cord without deteriorating the tire durability performance, and to improve the vibration riding comfort and steering stability of the tire. It is to provide a tire containing.
【0007】[0007]
【課題を解決するための手段】即ち、本発明は、一対の
ビードコアをトロイダル状にまたがる少なくとも一層の
カーカスプライ層と、該カーカスプライ層のタイヤ半径
方向外側にベルト層と、該ベルト層の外周側に少なくと
も一層のベルト補強層と、該ベルト補強層の外周側にト
レッドを有するタイヤにおいて、該ベルト補強層コード
が有機繊維からなり、該ベルト補強層のベルト幅方向、
ショルダー部のコードが、有機繊維原糸に下記式で規定
される下撚り数n1 (S)、下撚り係数N1 (S)とな
るように下撚りをかけた後、該下撚り糸複数本を引き揃
えて、下撚りと逆方向の下記式で規定される上撚り数n
2 (S)、上撚係数N2 (S)となるような上撚りをか
けた双撚り糸であり、かつ、該ベルト補強層の、タイヤ
ベルト上幅方向においてショルダー部のコード上撚り係
数N2 (S)とセンター部のコード上撚り係数N2
(C)が下記式1〜式3の条件を満たす空気入ラジアル
タイヤである。 [式1] (D2 /D1 )1/2 <N2 (S)/N1 (S)≦8 [式2] 0.30 <N2 (S)< 0.68 [式3] 1<N2 (S)/N2 (C)<3 ただし、式1〜式3に於いて、下撚り糸束の表示デニー
ルD1 、トータル表示デニールD2 、下撚り数n1 (回
/10cm)、上撚り数n2 (10cm)、有機繊維の比重ρ、
としたとき、 N1 =n1 ×(0.139 ×D1/ρ)1/2×10-3 N2 =n2 ×(0.139 ×D2/ρ)1/2×10-3 That is, the present invention is directed to at least one carcass ply layer that straddles a pair of bead cores in a toroidal shape, a belt layer outside the carcass ply layer in the tire radial direction, and an outer periphery of the belt layer. At least one belt reinforcing layer on the side, in a tire having a tread on the outer peripheral side of the belt reinforcing layer, the belt reinforcing layer cord is made of organic fibers, the belt width direction of the belt reinforcing layer,
A plurality of undertwisted yarns are obtained by subjecting the organic fiber raw yarn to undertwisting so that the cord of the shoulder portion has the undertwisted number n 1 (S) and the undertwisted coefficient N 1 (S) defined by the following formula. And the number of upper twists defined by the following formula in the opposite direction to the lower twist
2 (S) and a twisting coefficient N 2 (S), which is a twisted twisted yarn, and a cord twisting coefficient N 2 of the shoulder portion of the belt reinforcing layer in the tire belt upper width direction. (S) and cord twisting coefficient N 2 at the center
(C) is a pneumatic radial tire that satisfies the following conditions 1 to 3. [Formula 1] (D 2 / D 1 ) 1/2 <N 2 (S) / N 1 (S) ≦ 8 [Formula 2] 0.30 <N 2 (S) <0.68 [Formula 3] 1 <N 2 ( S) / N 2 (C) <3 However, in Formula 1 to Formula 3, the display denier D 1 of the lower twisted yarn bundle, the total display denier D 2 , the number of lower twists n 1 (times / 10 cm), the number of upper twists n 2 (10 cm), specific gravity of organic fiber ρ,
Then, N 1 = n 1 × (0.139 × D 1 / ρ) 1/2 × 10 -3 N 2 = n 2 × (0.139 × D 2 / ρ) 1/2 × 10 -3
【0008】又、本発明に於いて、ベルト補強層コード
に使用する繊維種がポリエステル繊維、レーヨン繊維、
または、ポリアミド樹脂繊維であることが望ましい。Further, in the present invention, the fiber type used for the belt reinforcing layer cord is polyester fiber, rayon fiber,
Alternatively, it is preferably a polyamide resin fiber.
【0009】[0009]
【発明の実施の形態】本発明で用いる有機繊維は下撚り
係数N1 (S)と上撚り数係数N2 (S)の比N2
(S)/N1 (S)が(D2 /D1 )1/2 より大きく8
以下でなければならず、かつN2 (S)が 、0.30 よ
り大きく 0.68 未満でなければならない。N2 (S)/
N1 (S)が(D2 /D1 )1/2 以下、あるいは、8を
超えるとき、および、N2 (S)が 0.68 以上である
ときは、コード初期引張剛性値が低いためにベルト端歪
を十分に抑えられず、タイヤの高速耐久性を低下させて
しまう。また、N2 (S)が 0.30 以下の時は、コード
の破断伸度が低く、やはり、高速対久性を低下させてし
まう。好ましくは2≦N2 (S)/N1 (S)≦4、0.
4 ≦N2 (S)≦ 0.6である。BEST MODE FOR CARRYING OUT THE INVENTION The organic fiber used in the present invention is a ratio N 2 of the lower twist coefficient N 1 (S) and the upper twist number coefficient N 2 (S).
(S) / N 1 (S) is larger than (D 2 / D 1 ) 1/2 and is 8
Must be less than or equal to and N 2 (S) must be greater than 0.30 and less than 0.68. N 2 (S) /
When N 1 (S) is (D 2 / D 1 ) 1/2 or less, or exceeds 8 and when N 2 (S) is 0.68 or more, the initial tensile rigidity value of the cord is low and the belt The end strain cannot be suppressed sufficiently, and the high speed durability of the tire is deteriorated. Further, when N 2 (S) is 0.30 or less, the elongation at break of the cord is low, which also deteriorates the high-speed durability. Preferably 2 ≦ N 2 (S) / N 1 (S) ≦ 4, 0.
4 ≦ N 2 (S) ≦ 0.6.
【0010】また、ベルト補強層に用いる有機繊維コー
ドの上撚り係数は、 1<N2 (S)/N2 (C)<3 を満たさなければならない。このサイド部とセンター部
の上撚り数の比が上記の式を満たせば、ショルダー部コ
ードの熱収縮率が大きいために、加硫中、コードが収縮
して走行中のベルト端歪を抑える方向に適度に締め付け
ることにより高速耐久性を確保し、かつ、ショルダー部
コード初期引張剛性が低いために周方向剛性が低下する
ことで接地形状が最適化され、実車操縦性がよくなる。
さらに、ショルダー部の上撚り係数を高くしてあるた
め、トータルの周方向剛性が低く抑えられ、突起乗り越
し時の振動が伝わりにくくなり、振動乗り心地性がよく
なる。ここで、ショルダー部とセンター部の上撚り係数
の比が3以上となると、タイヤセンター部周方向剛性が
タイヤショルダー部周方向剛性に対して相対的に高すぎ
るためにセンター接地長がショルダー接地長に対し短く
なりすぎるため、また、ショルダー部とセンター部の上
撚り係数の比が1以下であると、タイヤショルダー部周
方向の剛性がタイヤセンター部周方向の剛性に対して相
対的に高すぎるために、ショルダー接地長がセンター接
地長に対し短くなりすぎて、いずれも、接地形状が不安
定となり、操縦安定性が低下する。好ましくは、1.5 <
N2 (S)/N2 (C)< 2.5 である。さらに、本発
明では、ベルト補強層のセンター部に用いる有機繊維コ
ードにも、上撚り係数と下撚り係数とが異なったものを
用いることができ、その場合は、(D2 /D1 )1/2 <
N2 (C)/N1 (C)≦8、0.2 ≦N2 (C)≦ 0.3
であることが好ましい。Further, the twisting coefficient of the organic fiber cord used for the belt reinforcing layer must satisfy 1 <N 2 (S) / N 2 (C) <3. If the ratio of the number of twists on the side part and the center part satisfies the above formula, the thermal contraction rate of the shoulder cord is large, so that the cord contracts during vulcanization and suppresses belt end strain during running. High-speed durability is ensured by proper tightening, and the circumferential rigidity is reduced due to the low initial tensile rigidity of the shoulder cord, so that the ground contact shape is optimized and the maneuverability of the actual vehicle is improved.
Further, since the upper twist coefficient of the shoulder portion is made high, the total circumferential rigidity is suppressed to be low, the vibration when passing over the protrusion is hard to be transmitted, and the vibration riding comfort is improved. Here, if the ratio of the twisting coefficient of the shoulder portion to the center portion is 3 or more, the tire center portion circumferential rigidity is too high relative to the tire shoulder portion circumferential rigidity, so the center ground contact length is the shoulder ground contact length. On the other hand, if the ratio of the upper twist coefficient of the shoulder portion to the center portion is 1 or less, the rigidity in the tire shoulder portion circumferential direction is relatively high relative to the tire center portion circumferential direction. For this reason, the shoulder ground contact length becomes too short with respect to the center ground contact length, and in any case, the ground contact shape becomes unstable and the steering stability deteriorates. Preferably, 1.5 <
N 2 (S) / N 2 (C) <2.5. Further, in the present invention, as the organic fiber cord used for the center portion of the belt reinforcing layer, those having different upper twist coefficient and lower twist coefficient can be used, and in that case, (D 2 / D 1 ) 1 / 2 <
N 2 (C) / N 1 (C) ≦ 8, 0.2 ≦ N 2 (C) ≦ 0.3
It is preferred that
【0011】本発明で用いられる有機繊維の種類は特に
問わないが、ポリエチレンテレフタレート(以下PET
と称す)、ポリエチレンナフタレートのようなポリエス
テル繊維、レーヨン繊維、または、ナイロン66、ナイ
ロン46、ケブラーのようなポリアミド樹脂繊維が好ま
しい。中でも、ナイロン6、6が、コード物性のトータ
ルバランスの点から好ましい。The type of organic fiber used in the present invention is not particularly limited, but polyethylene terephthalate (hereinafter PET) is used.
Polyester fiber such as polyethylene naphthalate, rayon fiber, or polyamide resin fiber such as nylon 66, nylon 46, and Kevlar. Of these, nylon 6 and 6 are preferable from the viewpoint of the total balance of the physical properties of the cord.
【0012】[0012]
【実施例】以下に実施例を挙げて本発明を具体的に説明
するが、本発明の主旨を越えないかぎり、本実施例に限
定されることはない。又、実施例中の部及び%は、特に
ことわらない限り重量基準である。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples as long as the gist of the present invention is not exceeded. Further, parts and% in the examples are based on weight unless otherwise specified.
【0013】図1は、この発明による乗用車用空気入り
タイヤの回転軸心を含む平面による断面を示し、図中1
はビード部、2はサイドウォール部、3はトレッド部、
4はカーカスプライ、5はベルト層、6はビードコア、
7および7’はベルト補強層を示している。カーカスプ
ライ4は一対のビード部1、一対のサイドウォール部2
およびトレッド部3を補強し、ベルト層5はトレッド部
3を強化する。ベルト5はタイヤ赤道面Eを挟んで互い
に交差配列になる複数(図示例は二層)のスチールコー
ド層からなる。また、ベルト層5の外周側には少なくと
も一層のベルト補強層7を具える(図示例は二層であ
り、うち一層7’は、ベルト端のみに具えられてい
る)。ベルト層補強層7は、二層以上の場合は、そのう
ちの一層がベルトの幅方向全体を覆っていればよい。空
気入りタイヤはサイズが185SR14の乗用車用ラジ
アルタイヤであり、その構造は図1に従い、カーカスプ
ライ4は1プライからなる。実施例のタイヤは10例、
これらの性能及び耐久性を検証するため、ベルト補強層
用コードを除く他は全て実施例に合わせた比較例タイヤ
を7例、及び、参考として、従来例タイヤを2例準備し
た。FIG. 1 is a sectional view of a pneumatic tire for passenger cars according to the present invention, taken along a plane including the axis of rotation.
Is a bead portion, 2 is a sidewall portion, 3 is a tread portion,
4 is a carcass ply, 5 is a belt layer, 6 is a bead core,
7 and 7'indicate belt reinforcement layers. The carcass ply 4 includes a pair of beads 1 and a pair of sidewalls 2.
And, the tread portion 3 is reinforced, and the belt layer 5 strengthens the tread portion 3. The belt 5 is composed of a plurality of (two layers in the illustrated example) steel cord layers which are arranged in an intersecting manner with the tire equatorial plane E interposed therebetween. Further, at least one belt reinforcing layer 7 is provided on the outer peripheral side of the belt layer 5 (the illustrated example is two layers, and one layer 7'is provided only at the belt end). When the belt layer reinforcing layer 7 has two or more layers, one of the layers may cover the entire width direction of the belt. The pneumatic tire is a radial tire for passenger cars having a size of 185SR14, the structure thereof is in accordance with FIG. 1, and the carcass ply 4 consists of one ply. Ten tires in the example,
In order to verify these performances and durability, seven comparative example tires were prepared, and two conventional example tires were prepared for reference, except for the belt reinforcing layer cord.
【0014】各々のタイヤのベルト補強層6に適用した
断面円形状の有機繊維は、通常の紡糸方法により作成し
た有機繊維を、所定の下撚り数、及び、上撚り数にて双
撚りにしたコードを通常のディップ液に浸して接着処理
を施すことにより得た。The organic fiber having a circular cross section applied to the belt reinforcing layer 6 of each tire is obtained by twisting the organic fiber prepared by a conventional spinning method into a double twist with a predetermined number of lower twists and a predetermined number of upper twists. It was obtained by immersing the cord in an ordinary dip solution and subjecting it to an adhesive treatment.
【0015】ディップ液の調整方法は DuPont 社の処方
IPD-22 に従った。RFLは、下記組成に調整した。 軟水 592.61重量部 レゾルシン 18.20 ホルマリン(37%) 26.90 水酸化ナトリウム(10%水溶液) 6.60 ビニルピリジンラテックス(注1) 175.65 スチレンーブタジエン共重合体ラテックス(注2) 180.04 合計 1000.00 (注1)日本合成ゴム(株)製ラテックス、商品名;JSR0650 (注2)日本合成ゴム(株)製ラテックス、商品名;JSR2108 次に、上記ディップ処理済みの有機繊維コードを通常の
方法にて乾燥した。The preparation method of the dip liquid is the recipe of DuPont
Followed IPD-22. RFL was adjusted to the following composition. Soft water 592.61 parts by weight Resorcin 18.20 Formalin (37%) 26.90 Sodium hydroxide (10% aqueous solution) 6.60 Vinyl pyridine latex (Note 1) 175.65 Styrene-butadiene copolymer latex (Note 2) 180.04 Total 1000.00 (Note 1) Latex manufactured by Japan Synthetic Rubber Co., Ltd .; trade name; JSR0650 (Note 2) Latex manufactured by Japan Synthetic Rubber Co., Ltd., trade name; JSR2108 The fiber cord was dried in the usual way.
【0016】上述したようにして準備したコードをゴム
引き布とするに当たり、コード打ち込み数を、50本/
5cm とした。When the cord prepared as described above is used as a rubberized cloth, the number of cords to be driven is 50 /
It was set to 5 cm.
【0017】各種タイヤ性能の測定は、下記の方法によ
った。 1) 高速耐久性 時速120km/時から10km/時刻みで速度を上げ
て、各速度で20分ずつ走行させ、故障したときの速度
(km/時)を高速耐久性とした。Various tire performances were measured by the following methods. 1) High-speed durability The speed (120 km / hour) was increased from 10 km / hour to 10 km / hour, and each speed was run for 20 minutes, and the speed (km / hour) at the time of failure was defined as high-speed durability.
【0018】2)操縦性 外径3000mmのドラム上に内圧1.70kg/cm
2 に調整した試験タイヤを設置し、該タイヤのサイズと
内圧からJATMAに定められる最大荷重を負荷させた
後、30kg/時の速度で30分間予備走行させ、無負
荷状態で内圧を1.70kg/cm2 に再調整し、再度
予備走行の荷重を負荷し、同一速度の前記ドラム上でス
リップアングルを最大14゜まで正負連続してつけた、
正負角度までのコーナリングフォース(CF)を測定
し、次式: CP(Kg / ° )={CF(1°)(Kg)+CF(2°)(Kg)/2 °+CF(3
°)(Kg)/3 °+CF(4 °)(Kg)/4 °}/4 にてコーナリングパワー(CP値)を求めた。尚、指数
化は各試験タイヤのCP値で除算し、コントロールタイ
ヤを100とした。この指数が大きいほど操縦性が良好
である。2) Maneuverability Internal pressure of 1.70 kg / cm on a drum having an outer diameter of 3000 mm.
After installing the test tire adjusted to 2 , apply the maximum load specified in JATMA from the size and internal pressure of the tire, preliminarily run for 30 minutes at a speed of 30 kg / hour, and maintain the internal pressure at 1.70 kg under no load condition. / Cm 2 , readjustment load was applied again, and the slip angle was continuously applied up to 14 ° on the drum at the same speed.
The cornering force (CF) up to the positive and negative angles is measured, and the following formula: CP (Kg / °) = {CF (1 °) (Kg) + CF (2 °) (Kg) / 2 ° + CF (3
The cornering power (CP value) was calculated at (°) (Kg) / 3 ° + CF (4 °) (Kg) / 4 °} / 4. The index was divided by the CP value of each test tire, and the control tire was set to 100. The larger the index, the better the maneuverability.
【0019】3) 突起乗越試験 第2図に示す如く、外径2000mmのドラム上の1ヵ
所に鉄製突起8(上底19mm、下底38mm、高さ
9.5mm)を固定し、内圧1.70 kg/ cm2 に
調整した試験タイヤをタイヤサイズと内圧からJATM
Aに定められる荷重を負荷し、80km/ 時の速度で2
0分間予備走行させた後、無負荷状態で内圧を1.70
kg/ cm2 に再調整し、速度を20km/ 時に合わせ
て荷重を予備走行時の負荷に調整して以後5km/ 時ず
つ速度を増加させ各速度において突起乗り越し時のタイ
ヤ固定軸荷重変動の平均波形を求め、P−P値を算出し
た。なお、P−P値とは第2図から明らかな如く突起乗
り越し時のタイヤ軸荷重の変動振幅の最大値までの振幅
である。タイヤ固定軸における突起乗り越し時の軸荷重
変動方向は、タイヤ進行方向(前後軸力)およびタイヤ
上下方向(上下軸力)の2方向を測定し、代表値として
速度40km/ 時および120km/ 時の2水準の上下
軸力と前後軸力を指数化した。なお、指数化はコントロ
ールタイヤを100として次式によって表示した。 テストタイヤ指数=100+100×{[P−P(1) ]
−[P−P(2) ]}/[P−P(1) ] ただし、 P−P(1):コントロールタイヤのP−P値 P−P(2):テストタイヤのP−P値 指数化はテストタイヤのP−P値が小さいほうが指数が
大きくなるようにしたものであり、指数が大きいほど振
動乗り心地性が良好であることを示す。3) Protrusion riding test As shown in FIG. 2, an iron protrusion 8 (upper bottom 19 mm, lower bottom 38 mm, height 9.5 mm) was fixed at one place on a drum having an outer diameter of 2000 mm, and internal pressure 1. The test tire adjusted to 70 kg / cm 2 was tested by JATM based on the tire size and internal pressure.
2 at the speed of 80km / hour under the load specified in A
After the preliminary running for 0 minutes, the internal pressure was 1.70 with no load.
Readjusted to kg / cm 2 , adjust the speed to 20 km / h, adjust the load to the load during preliminary running, and then increase the speed by 5 km / h, and at each speed average the tire fixed shaft load fluctuations when overhanging the protrusion. The waveform was obtained and the PP value was calculated. Note that the P-P value is an amplitude up to the maximum value of the fluctuation amplitude of the tire shaft load when overhanging the protrusion, as is clear from FIG. The axial load fluctuation direction when riding over a protrusion on a tire fixed shaft is measured in two directions: the tire advancing direction (front-rear axial force) and the tire up-down direction (vertical axial force). Typical values are 40 km / h and 120 km / h. Two levels of vertical and longitudinal axial forces were indexed. In addition, the indexing was represented by the following formula with the control tire being 100. Test tire index = 100 + 100 × {[PP (1)]
-[PP (2)]} / [PP (1)] where PP (1): PP value of control tire PP (2): PP value of test tire Index The index indicates that the smaller the PP value of the test tire, the larger the index, and the larger the index, the better the vibration riding comfort.
【0020】以上述べた(1)及び(2)の試験結果及
び、コードの種類、及び、構造を、表1に示した。試験
結果は、従来例1をコントロールタイヤとしている。Table 1 shows the test results of (1) and (2) described above, the type of cord, and the structure. As a test result, Conventional Example 1 is used as a control tire.
【0021】[0021]
【表1−1】 [Table 1-1]
【表1−2】 *1 :ナイロン6、6 n1 (C) :センター部の下撚り数 n1 (S):ショルダー部の下撚り数 n2 (C) :センター部の上撚り数 n2 (S) :ショルダー部の上撚り数 D1 :表示デニール数 D2 :トータル表示デニール数 N1 (C) :センター部の下撚り係数 N1 (S) :ショルダー部の下撚り係数 N2 (C) :センター部の上撚り係数 N2 (S) :ショルダー部の上撚り係数[Table 1-2] * 1: Nylon 6, 6 n 1 (C): Number of lower twists of the center part n 1 (S): Number of lower twists of the shoulder part n 2 (C): Number of upper twists of the center part n 2 (S): Shoulder Number of top twists of part D 1 : Number of displayed denier D 2 : Total number of denier displayed N 1 (C): Center of twisting factor N 1 (S): Shoulder part of twisting factor N 2 (C): Center Top twist coefficient N 2 (S): Top twist coefficient of shoulder
【0022】表1で、従来例1、従来例2とは、それぞ
れ、バランス撚り構造のナイロン6、6およびレーヨン
をベルト補強層コードに用いたタイヤであり、各試験タ
イヤの操縦性および、振動乗り心地性は、この従来例1
のタイヤをコーントロールとして表わした。In Table 1, "Conventional example 1" and "Conventional example 2" are tires in which nylon 6 and 6 having a balanced twist structure and rayon are used as cords for the belt-reinforcing layer, respectively. Riding comfort is the same as the conventional example 1
The tire was designated as a corn troll.
【0023】比較例1、2、3、4、5、6は、いずれ
もナイロン6、6をベルト補強層に用いており、それぞ
れ、ショルダー部での上撚り係数と下撚り係数の比が下
限より小さい例、ショルダー部での上撚り係数と下撚り
係数の比が上限より大きい例、ショルダー部での上撚り
係数が上限より大きい例、ショルダー部での上撚り係数
が下限より小さい例、ショルダー部とセンター部の上撚
り係数の比が下限より小さい例、および、ショルダー部
とセンター部の上撚り係数の比が上限より大きい例であ
る。また、比較例7は、レーヨンをベルト補強層に用い
ており、ショルダー部での上撚り係数と下撚り係数の比
が下限より小さい例である。In Comparative Examples 1, 2, 3, 4, 5, and 6, nylon 6 and 6 are used for the belt reinforcing layer, and the ratio of the upper twist coefficient to the lower twist coefficient at the shoulder portion is the lower limit. Smaller examples, cases where the ratio of the upper twist coefficient to the lower twist coefficient in the shoulder part is larger than the upper limit, examples where the upper twist coefficient in the shoulder part is larger than the upper limit, examples where the upper twist coefficient in the shoulder part is smaller than the lower limit, shoulder In this example, the ratio of the twisting coefficient of the center part to the center part is smaller than the lower limit, and the ratio of the twisting coefficient of the shoulder part to the center part is larger than the upper limit. Comparative Example 7 is an example in which rayon is used for the belt reinforcing layer and the ratio of the upper twist coefficient and the lower twist coefficient at the shoulder portion is smaller than the lower limit.
【0024】比較例1、2、実施例1、2、6、7、8
より、ショルダー部での上撚り係数と下撚り係数の比が
本発明の請求範囲内にあれば、操縦安定性、振動乗り心
地性ともに向上することがわかる。比較例3、4、実施
例3、4、7より、ショルダー部における上撚り係数が
本発明の範囲にはずれると、操縦安定性が劣ることがわ
かる。比較例5、6、実施例3、4、5、7より、ショ
ルダー部とセンター部の上撚り係数の比が本願の範囲内
にあれば、操縦安定性、振動乗り心地性、ともに、かな
り向上することがわかる。Comparative Examples 1 and 2, Examples 1, 2, 6, 7, 8
From this, it can be seen that if the ratio of the upper twist coefficient and the lower twist coefficient in the shoulder portion is within the scope of the claims of the present invention, both steering stability and vibration riding comfort are improved. From Comparative Examples 3 and 4 and Examples 3, 4, and 7, it is understood that when the twisting coefficient in the shoulder portion deviates from the range of the present invention, the steering stability becomes poor. From Comparative Examples 5 and 6 and Examples 3, 4, 5, and 7, when the ratio of the twisting coefficient of the shoulder portion to the center portion is within the range of the present application, both steering stability and vibration riding comfort are considerably improved. I understand that
【0025】比較例7および、実施例10より、ベルト
補強層にレーヨンコードを用いた場合でも同様の効果が
得られることがわかる。From Comparative Example 7 and Example 10, it is understood that the same effect can be obtained even when rayon cord is used for the belt reinforcing layer.
【0026】本発明の有機繊維をベルト補強層に用いた
タイヤの種類は特に制限されないが、乗用車用タイヤ
や、サイズが7.50R16以下の小型トラック用タイ
ヤに用いると、特に効果が大きい。The type of tire using the organic fiber of the present invention in the belt reinforcing layer is not particularly limited, but it is particularly effective when used for a passenger car tire or a light truck tire having a size of 7.50R16 or less.
【0027】[0027]
【発明の効果】タイヤのベルト補強層コードのショルダ
ー部に特定の物性を持つ有機繊維コードを用い、さら
に、その撚り構造を限定することにより、高速転動時の
径成長が抑えられ、十分なタイヤ高速耐久性を保持する
ことができる。EFFECTS OF THE INVENTION By using an organic fiber cord having specific physical properties for the shoulder portion of the belt reinforcing layer cord of a tire and further limiting the twist structure, diameter growth during high-speed rolling can be suppressed and sufficient It is possible to maintain high speed durability of the tire.
【0028】[0028]
【図1】図1は、この発明による乗用車用空気入りタイ
ヤの回転軸心を含む平面による断面図である。FIG. 1 is a sectional view taken along a plane including a rotation axis of a pneumatic tire for passenger cars according to the present invention.
【図2】図2は、突起乗り越し振動試験機の略図であ
る。FIG. 2 is a schematic diagram of a bump overpass vibration tester.
1 :ビード部 2 :サイドウォール部 3 :トレッド部 4 :カーカスプライ 5 :ベルト 6 :ビードコア 7 :ベルト補強層 7’:ベルト補強層 8 :鉄製突起 1: bead part 2: sidewall part 3: tread part 4: carcass ply 5: belt 6: bead core 7: belt reinforcing layer 7 ': belt reinforcing layer 8: iron protrusion
Claims (2)
がる少なくとも一層のカーカスプライ層と、該カーカス
プライ層のタイヤ半径方向外側にベルト層と、該ベルト
層の外周側に少なくとも一層のベルト補強層と、該ベル
ト補強層の外周側にトレッドを有するタイヤにおいて、
該ベルト補強層コードが有機繊維からなり、該ベルト補
強層のベルト幅方向、ショルダー部のコードが、有機繊
維原糸に下記式で規定される下撚り数n1 (S)、下撚
り係数N1 (S)となるように下撚りをかけた後、該下
撚り糸複数本を引き揃えて、下撚りと逆方向の下記式で
規定される上撚り数n2 (S)、上撚係数N2 (S)と
なるような上撚りをかけた双撚り糸であり、かつ、該ベ
ルト補強層の、タイヤベルト上幅方向においてショルダ
ー部のコード上撚り係数N2 (S)とセンター部のコー
ド上撚り係数N2 (C)が下記式1〜式3の条件を満た
す空気入ラジアルタイヤ。 [式1] (D2 /D1 )1/2 <N2 (S)/N1 (S)≦8 [式2] 0.30 <N2 (S)< 0.68 [式3] 1<N2 (S)/N2 (C)<3 ただし、式1〜式3に於いて、下撚り糸束の表示デニー
ルD1 、トータル表示デニールD2 、下撚り数n1 (回
/10cm)、上撚り数n2 (10cm)、有機繊維の比重ρ、
としたとき、 N1 =n1 ×(0.139×D1/ρ)1/2×10-3 N2 =n2 ×(0.139×D2/ρ)1/2×10-3 1. A carcass ply layer that straddles a pair of bead cores in a toroidal shape, a belt layer on the outside of the carcass ply layer in the tire radial direction, and at least one belt reinforcing layer on the outer peripheral side of the belt layer. In a tire having a tread on the outer peripheral side of the belt reinforcing layer,
The belt reinforcing layer cord is made of organic fibers, and the cord in the belt width direction and the shoulder portion of the belt reinforcing layer has a twist number n 1 (S) and a twist factor N of the organic fiber raw yarn defined by the following formula. After the undertwist is applied to obtain 1 (S), a plurality of the undertwisted yarns are aligned, and the number of upper twists n 2 (S) and the upper twist coefficient N in the opposite direction of the lower twist are defined by the following formula. 2 (S), which is a twisted twisted yarn, and in the belt reinforcing layer, the cord twisting factor N 2 (S) at the shoulder portion and the cord at the center portion in the tire belt upper width direction. A pneumatic radial tire having a twist coefficient N 2 (C) that satisfies the following equations 1 to 3. [Formula 1] (D 2 / D 1 ) 1/2 <N 2 (S) / N 1 (S) ≦ 8 [Formula 2] 0.30 <N 2 (S) <0.68 [Formula 3] 1 <N 2 ( S) / N 2 (C) <3 However, in the formulas 1 to 3, the display denier D 1 of the lower twisted yarn bundle, the total display denier D 2 , the number of lower twists n 1 (times / 10 cm), the number of upper twists n 2 (10 cm), specific gravity of organic fiber ρ,
Then, N 1 = n 1 × (0.139 × D 1 / ρ) 1/2 × 10 -3 N 2 = n 2 × (0.139 × D 2 / ρ) 1/2 × 10 -3
ポリエステル繊維、レーヨン繊維、または、ポリアミド
樹脂繊維よりなる特許請求項一記載の空気入りラジアル
タイヤ。2. The pneumatic radial tire according to claim 1, wherein the fiber type used for the belt reinforcing layer cord is polyester fiber, rayon fiber or polyamide resin fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7301657A JPH09142101A (en) | 1995-11-20 | 1995-11-20 | Pneumatic radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7301657A JPH09142101A (en) | 1995-11-20 | 1995-11-20 | Pneumatic radial tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09142101A true JPH09142101A (en) | 1997-06-03 |
Family
ID=17899577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7301657A Pending JPH09142101A (en) | 1995-11-20 | 1995-11-20 | Pneumatic radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09142101A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6851463B1 (en) | 1999-04-08 | 2005-02-08 | Alliedsignal Inc. | Composite comprising organic fibers having a low twist multiplier and improved compressive modulus |
| JP2010036886A (en) * | 2008-07-10 | 2010-02-18 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
-
1995
- 1995-11-20 JP JP7301657A patent/JPH09142101A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6851463B1 (en) | 1999-04-08 | 2005-02-08 | Alliedsignal Inc. | Composite comprising organic fibers having a low twist multiplier and improved compressive modulus |
| JP2010036886A (en) * | 2008-07-10 | 2010-02-18 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3555809B2 (en) | Radial tire | |
| EP3030431B1 (en) | Method for increasing the performances of a tyres for vehicle wheels and tyre for vehicle wheels | |
| JPH06305302A (en) | Pneumatic tire | |
| US4735249A (en) | Pneumatic radial passenger-car tire | |
| JP2009149282A (en) | Pneumatic tire | |
| KR100637852B1 (en) | High lateral curvature tires for two-wheeled vehicles | |
| US4708185A (en) | Pneumatic radial tire | |
| US6412533B1 (en) | High transverse-curvature tire for two-wheeled vehicles including specified belt structure | |
| JPH11227427A (en) | Pneumatic safety tire | |
| JP3764245B2 (en) | Pneumatic tire | |
| US8578989B2 (en) | Motor vehicle tire | |
| JP5496752B2 (en) | Pneumatic radial tire | |
| JP5332422B2 (en) | Pneumatic tire | |
| JPH09142101A (en) | Pneumatic radial tire | |
| US12330451B2 (en) | Pneumatic tire | |
| JP7699898B2 (en) | Pneumatic tires | |
| JPS6194803A (en) | Inflated radial tyre for automobile | |
| JP7572167B2 (en) | Pneumatic tires | |
| JPS6144682B2 (en) | ||
| JP2004130835A (en) | Radial tire | |
| JPH10297210A (en) | Pneumatic radial tire | |
| JPH09142104A (en) | Pneumatic tire for passenger car | |
| JP2011225007A (en) | Pneumatic tire | |
| JPS60131302A (en) | Radial-ply tire | |
| JPS6194802A (en) | Inflated radial tyre for automobile |