JPS60234003A - Radial-ply tire - Google Patents

Radial-ply tire

Info

Publication number
JPS60234003A
JPS60234003A JP59089701A JP8970184A JPS60234003A JP S60234003 A JPS60234003 A JP S60234003A JP 59089701 A JP59089701 A JP 59089701A JP 8970184 A JP8970184 A JP 8970184A JP S60234003 A JPS60234003 A JP S60234003A
Authority
JP
Japan
Prior art keywords
belt layer
ply
layer
angle
carcass
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
JP59089701A
Other languages
Japanese (ja)
Inventor
Kazuo Asano
和夫 浅野
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.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries 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 Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Priority to JP59089701A priority Critical patent/JPS60234003A/en
Publication of JPS60234003A publication Critical patent/JPS60234003A/en
Pending legal-status Critical Current

Links

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
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

PURPOSE:To check shear deformation inside the surface of a belt layer as well as to prevent lateral force in time of tire running from occurring, by setting a plt having a cord angle showing negative shear rigidity down to an auxiliary layer, and setting up it in position adjacent to the ply of the belt layer. CONSTITUTION:A radial-ply tire 1 is constituted of a collodal carcass 3 turning up both ends around a bead core 2 and engaging it thereat, a belt layer 4 consisting of two sheets of plies 4a and 4b disposing cords at a relative shallow angle at the outside of a crown part of this carcass 3 in a tire circumferential direction and each of auxiliary layers 6a and 6b being set up between the belt layer 4 and a tread layer 5 as well as between the belt layer 4 and the carcass 3. At this time, the auxiliary layer 6b having cord arrangement of positive angle at 54 deg.-90 deg. adjacent to the upper side of an upper side ply 4b is set up, and the auxiliary layer 6b having the cord arrangement of the positive angle at -54 deg.- -90 deg. is set up at the lower side of a lower side ply 4a.

Description

【発明の詳細な説明】 本発明は、コニシティ及びプル現象を改善したラジアル
タイヤに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radial tire with improved conicity and pull phenomena.

一般にラジアルタイヤは、繊維コードを平行に引き揃え
たプライをそのコードがラジアル方向に配列されるよう
に、プライ両端をビードコアのまわりに折返したトロイ
ド状カーカスと、このカーカスのクラウン部外側にはタ
イヤ周方向に比較的浅いコード角度のプライよりなるベ
ルト層が配置されている。ここで乗用車用タイヤにおい
ては、ベルト層はスチールコードよりなるプライを２枚
、プライ間でコードが交差するように配置されるが、こ
の場合、ベルト層はタイヤの回転時の平押しにより繰り
返しの両外曲げモーメントを受けることになる。即ち２
枚のプライよりなるベルト層を上側プライと下側プライ
の間の境界面を中立軸としてベルト層が接地時に変形す
ると上側プライは、タイヤ周方向に圧縮歪を受けるのに
対して下側プライは逆に伸張歪を受けることになり、こ
れがベルト層のプライコードのプライ間で反対方向に傾
斜していることと相俟って上側プライ及び下側プライと
も同じ方向の横力を受けることになり、コニシティ、あ
るいはプル現象が起こることとなる。In general, radial tires have a toroidal carcass in which fiber cords are arranged in parallel to each other, and both ends of the plies are folded back around a bead core so that the cords are arranged in the radial direction. A belt layer made of plies with a relatively shallow cord angle is disposed in the circumferential direction. In passenger car tires, the belt layer consists of two plies made of steel cords, arranged so that the cords intersect between the plies, but in this case, the belt layer is repeatedly pressed flat when the tire rotates. It will receive external bending moments on both sides. That is, 2
When the belt layer is deformed when it touches the ground with the boundary between the upper ply and the lower ply as the neutral axis, the upper ply receives compressive strain in the tire circumferential direction, while the lower ply On the contrary, it will be subjected to extensional strain, and this, combined with the fact that the ply cords of the belt layer are tilted in opposite directions, will result in both the upper and lower plies being subjected to lateral force in the same direction. , conicity, or a pull phenomenon will occur.

本発明の前記問題点を解決しうる安定な走行を可能とす
るラジアルタイヤの提供を目的としている。It is an object of the present invention to provide a radial tire that can solve the above-mentioned problems and enable stable running.

本発明は両端をビードコアのまわりに折返して係止され
るトロイド状カーカスと該カーカスのクラウン部外側に
タイヤ周方向に比較的浅い角度でコードが配列されてい
る２枚のプライをプライ間でコードが反対方向に傾斜し
て配列されるベルト層と、該ベルト層の両側にそれぞれ
１枚づつ配置され隣接するベルト層のプライコードと同
一方向に側斜し、しかもコード角度がタイヤ周方向に対
して約５４°〜９０°又は約−５４°〜−９０゜の範囲
で配列されてなる補助層を具えたことを特徴とするラジ
アルタイヤである。The present invention consists of a toroidal carcass that is secured by folding both ends around a bead core, and two plies in which cords are arranged at a relatively shallow angle in the tire circumferential direction on the outside of the crown part of the carcass. The ply cords are arranged so as to be inclined in opposite directions, and one ply cord is arranged on each side of the belt layer, and the ply cords are inclined in the same direction as the ply cords of the adjacent belt layer, and the cord angle is relative to the tire circumferential direction. A radial tire characterized by comprising an auxiliary layer arranged at an angle of about 54° to 90° or about -54° to -90°.

以下本発明の一実施例を図面に基づき説明する。An embodiment of the present invention will be described below based on the drawings.

図においてタイヤｌは、両端をビードコア２のまわりに
折返して係止されるトロイド状カーカス３と、該カーカ
ス３のクラウン部外側にタイヤ周方向に比較的浅い角度
でコードが配列される２枚のプライ４ａ、４ｂよりなる
ベルト層４、と該ベルト層とトレンド５の間、及びベル
ト層４とカーカス３の間にそれぞれ１枚の補助層６ａ、
６ｂが配置されている。In the figure, a tire l consists of a toroidal carcass 3 whose both ends are folded back around a bead core 2 and locked, and two cords arranged at a relatively shallow angle in the tire circumferential direction on the outside of the crown part of the carcass 3. A belt layer 4 consisting of plies 4a and 4b, one auxiliary layer 6a between the belt layer and the trend 5, and one auxiliary layer 6a between the belt layer 4 and the carcass 3,
6b is placed.

ここで−軸引張りを受ける一方向繊維強化ゴムつまりベ
ルト層のプライの剪断剛性Ｃｘｓは次式で示される。Here, the shear stiffness Cxs of the unidirectional fiber-reinforced rubber, that is, the ply of the belt layer, subjected to -axial tension is expressed by the following equation.

ここで　Ｅｏ：ゴムの弾性率 θ　：タイヤ同方向に対するコード角度１　：Ｃｏ５（
θ） ｍ：５ｌｎ（θ） をそれぞれ示す。Here, Eo: Elastic modulus of rubber θ: Cord angle with respect to the same direction of the tire 1: Co5 (
θ)m:5ln(θ) is shown respectively.

曲成をプライの剪断剛性Ｃｘｓを縦軸にプライのコード
角度θを横軸にして、グラフとして示すと、第２図のご
とくなる。If the bending is shown as a graph with the shear stiffness Cxs of the ply as the vertical axis and the cord angle θ of the ply as the horizontal axis, the result will be as shown in FIG.

図からコード角度θが約２８°で剪断剛性ＣｘＳの最大
値が表れるが５４°４４．。を境にして剪断剛性Ｑｘｓ
の値は負の値となり、さらに７１゜で負の値としての最
大値を示すこととなる。従来のベルト層のコード角度θ
は通常１５°〜３０゜の範囲で調整されており、剪断剛
性Ｃｘｓは最も高い値に設定されている。そこで本発明
では、ベルト層の前記剪断剛性を緩和するため、負の剪
断剛性を示すコード角度θが５４°　４４〜９０°の角
度、好ましくは６０°〜８０°の角度を有するプライを
補助層として前記ベルト層のプライに隣接して配置する
ものである。この補助層とベルト層の配置状態を第３図
に示す０図においてベルト層の下側プライ４ａｓ上側プ
ライ４ｂはコードが相互に交差して配列されているが、
ここで下側プライのコード角度を負の角度（−〇）とし
、上側プライのコード角度を正の角度（θ）とすると上
側プライ４ｂの上側に隣接して正のコード角度即ち５４
°　４４＃〜９０°の角度のコード配列を有する補助層
６ｂが配置される一方、下側プライ４ａの下側には負の
コード角度、即ち一５４°　４４＃〜−９０°の角度の
コード配列を有する補助Ｊ！１６ａが配置される。ここ
で補助層６ａ、６ｂはナイロン、ポリエステル、レーヨ
ン、アラミド等の有機繊維コードのほかガラスファイバ
ー、スチールコード等の無機繊維コードも使用できる。From the figure, the maximum value of shear stiffness CxS appears when the cord angle θ is approximately 28°, but it is 54°44. . The shear stiffness Qxs
The value of is a negative value, and furthermore, it shows the maximum value as a negative value at 71°. Conventional belt layer cord angle θ
is normally adjusted within the range of 15° to 30°, and the shear stiffness Cxs is set to the highest value. Therefore, in the present invention, in order to alleviate the shear stiffness of the belt layer, a ply having a cord angle θ of 54°, which indicates a negative shear stiffness, is an angle of 44 to 90°, preferably an angle of 60° to 80°, is used as an auxiliary layer. The belt layer is arranged adjacent to the ply of the belt layer. The arrangement of the auxiliary layer and the belt layer is shown in FIG. 3, in which the cords of the lower ply 4as and upper ply 4b of the belt layer are arranged to cross each other.
Here, if the cord angle of the lower ply is a negative angle (-0) and the cord angle of the upper ply is a positive angle (θ), the cord angle adjacent to the upper side of the upper ply 4b is positive, that is, 54
An auxiliary layer 6b having a cord arrangement with an angle of 44# to 90° is disposed, while a negative cord angle is arranged on the underside of the lower ply 4a, i.e. a cord with an angle of -54° to 44# to -90°. Auxiliary J with array! 16a is arranged. Here, for the auxiliary layers 6a and 6b, in addition to organic fiber cords such as nylon, polyester, rayon, and aramid, inorganic fiber cords such as glass fiber and steel cords can be used.

そして埋設ゴムはベルト層のプライと同様に比較的弾性
率の高いものが使用されるが、ベルト層の剪断剛性の緩
和効果を高めるため、ベルト層の埋設ゴムの１．５〜２
．５倍の弾性率を有するゴムを使用することが好ましい
。つまりプライの剪断剛性Ｃｘｓは前記式から明らかな
ごとく、埋設ゴムの弾性率の関数でもあり、このゴムの
弾性率を調整することにより、ベルト層の面内剪断変形
を抑制できるからである。The embedded rubber used has a relatively high elastic modulus, similar to the ply of the belt layer.
．． Preferably, a rubber with a modulus of elasticity of 5 times is used. That is, as is clear from the above equation, the shear rigidity Cxs of the ply is also a function of the elastic modulus of the embedded rubber, and by adjusting the elastic modulus of this rubber, the in-plane shear deformation of the belt layer can be suppressed.

然して本発明はベルト層の両側に特定コード角度を有す
るプライを配置したため、タイヤ走行時にベルト層に繰
り返し面外曲げ変形が生じても面内剪断変形が抑制でき
、その結果タイヤの走行時の横力の発生を抑制し、コニ
シティやプル現象の発生を防止することが可能となる。However, in the present invention, since plies having specific cord angles are arranged on both sides of the belt layer, even if the belt layer undergoes repeated out-of-plane bending deformation when the tire is running, in-plane shearing deformation can be suppressed, and as a result, the lateral deformation when the tire is running can be suppressed. It becomes possible to suppress the generation of force and prevent the occurrence of conicity and pull phenomena.

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

第１図は本発明のタイヤの断面図の左半分、第２図は剪
断剛性とコード角度の関係を示すグラフ、第３図は本発
明のベルト層及び補助層の配置状態の概略図を示す。 １・−・タイヤ、２・−ビードコア、３−カーカス、４
・・・ベルト層、５−・トレッド、 ６ａ、６ｂ・−補助層。 特許出願人　住友ゴム工業株式会社 代理人弁理士　苗　村　１ 第１　図 第２図 第３１Fig. 1 is the left half of a cross-sectional view of the tire of the present invention, Fig. 2 is a graph showing the relationship between shear rigidity and cord angle, and Fig. 3 is a schematic diagram of the arrangement of the belt layer and auxiliary layer of the present invention. . 1--tire, 2--bead core, 3-carcass, 4
...belt layer, 5--tread, 6a, 6b--auxiliary layer. Patent applicant Sumitomo Rubber Industries Co., Ltd. Patent attorney Naemura 1 Figure 1 Figure 2 Figure 31

Claims (1)

【特許請求の範囲】[Claims] ＋１１　両端をビードコアのまわりに折返して係止され
るトロイド状カーカスと、該カーカスのクラウン部外側
にタイヤ周方向に比較的浅い角度でコードが配列されて
いる２枚のプライをプライ間でコードが反対方向に側斜
して配列されるベルト層と、該ベルト層の両側にそれぞ
れ１枚づつ配置され隣接するベルト層のプライコードと
同一方向に傾斜し、しかもコード角度がタイヤ周方向に
対して約５４°〜９０°又は約−５４３〜−９０°の範
囲で配列されてなる補助層を具えたことを特徴とするラ
ジアルタイヤ。+11 A toroidal carcass that is secured by folding both ends around the bead core, and two plies with cords arranged at a relatively shallow angle in the tire circumferential direction on the outside of the crown of the carcass. Belt layers are arranged diagonally in opposite directions, and one ply cord is arranged on each side of the belt layer and is inclined in the same direction as the ply cord of the adjacent belt layer, and the cord angle is with respect to the tire circumferential direction. A radial tire comprising an auxiliary layer arranged at an angle of about 54° to 90° or about -543 to -90°.
JP59089701A 1984-05-06 1984-05-06 Radial-ply tire Pending JPS60234003A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59089701A JPS60234003A (en) 1984-05-06 1984-05-06 Radial-ply tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59089701A JPS60234003A (en) 1984-05-06 1984-05-06 Radial-ply tire

Publications (1)

Publication Number Publication Date
JPS60234003A true JPS60234003A (en) 1985-11-20

Family

ID=13978075

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59089701A Pending JPS60234003A (en) 1984-05-06 1984-05-06 Radial-ply tire

Country Status (1)

Country Link
JP (1) JPS60234003A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819704A (en) * 1986-07-04 1989-04-11 The Yokohama Rubber Co., Ltd. Radial tire having reduced ply steer
US5368081A (en) * 1992-02-27 1994-11-29 The Yokohama Rubber Co., Ltd. Pneumatic radial tire for passenger cars with defined steel belt cord
US5653829A (en) * 1992-05-08 1997-08-05 Michelin Recherche Et Technique S.A. Tire with three belt plies
US5711829A (en) * 1990-09-25 1998-01-27 Michelin Recherche Et Technique S.A. Three- belt tire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819704A (en) * 1986-07-04 1989-04-11 The Yokohama Rubber Co., Ltd. Radial tire having reduced ply steer
US5711829A (en) * 1990-09-25 1998-01-27 Michelin Recherche Et Technique S.A. Three- belt tire
US5368081A (en) * 1992-02-27 1994-11-29 The Yokohama Rubber Co., Ltd. Pneumatic radial tire for passenger cars with defined steel belt cord
US5653829A (en) * 1992-05-08 1997-08-05 Michelin Recherche Et Technique S.A. Tire with three belt plies

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