JPH0331006A - Pneumatic type for two-wheel vehicle - Google Patents

Pneumatic type for two-wheel vehicle

Info

Publication number
JPH0331006A
JPH0331006A JP1163725A JP16372589A JPH0331006A JP H0331006 A JPH0331006 A JP H0331006A JP 1163725 A JP1163725 A JP 1163725A JP 16372589 A JP16372589 A JP 16372589A JP H0331006 A JPH0331006 A JP H0331006A
Authority
JP
Japan
Prior art keywords
tire
carcass
belt
cords
tread
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
JP1163725A
Other languages
Japanese (ja)
Inventor
Kiyoshi Takahashi
清 高橋
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 JP1163725A priority Critical patent/JPH0331006A/en
Publication of JPH0331006A publication Critical patent/JPH0331006A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To apply force in the same direction to a coating rubber located between respective adjacent codes so as to eliminate peeling of the coating rubber, by setting the twist directions of respective mutually adjacent cords for forming a belt in the direction of a tyre, in mutually opposite directions to each other. CONSTITUTION:A carcass 12 wound about a bead core 10 has two plies 12a, 12b. And a tread 16 in whose a circumferential direction main grooves 14 are formed, is connected toroidally to aside wall 18. Moreover, a belt 20 is wound spirally between the tread 16 and the carcass 12. In the tyre of the above construction, two codes 22a, 22b which are forming a belt 20, and which are placed apart from each other, in the width direction of the tyre, are set opposite to each other twist directions A, B. Thereby, a force in the same direction is applied to a coating rubber located between respective codes 22a, 22b so as to eliminate peeling of the covering rubber caused by residual shearing force.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、二輪車用空気入りタイヤ、特には、螺旋状
に巻回されてタイヤ幅方向に延在するコードからなるベ
ルトを具える二輪車用空気入りタイヤに関するものであ
る。
Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a pneumatic tire for two-wheeled vehicles, particularly a pneumatic tire for two-wheeled vehicles equipped with a belt made of a spirally wound cord extending in the width direction of the tire. It concerns pneumatic tires.

(従来の技術) タイヤ赤道面に対して75゜〜90°の角度範囲で有機
繊維コードが一方向に配列されたプライからなるカーカ
スの外周に、弾性率の大きなコード、例えば、ハイモ、
ジュラスポリエステル、レーヨン、又は芳香族ポリアミ
ド繊維からなるコードが、タイヤ幅方向に螺旋状に巻回
されたベルトを有する二輪車用ラジアルタイヤは、螺旋
状に巻回されたベルトの、いわゆる「たが」効果により
、高速で走行する場合にあっても、そのトレッドがタイ
ヤ半径方向外方にせり出すことがなく、トレッドゴムの
動きが小さいことから、バイアスタイヤに比して発熱及
び転がり抵抗が小さく、耐磨耗性に優れ、また、接地面
積の減少が少なく軽量である等の多くの特徴を有してい
る。
(Prior art) A carcass consisting of a ply in which organic fiber cords are arranged in one direction at an angle of 75° to 90° with respect to the tire equatorial plane is coated with a cord having a high elastic modulus, such as cords with high elastic modulus, such as
Radial tires for motorcycles have a belt in which cords made of durassic polyester, rayon, or aromatic polyamide fibers are spirally wound in the width direction of the tire. As a result, even when driving at high speeds, the tread does not protrude outward in the tire's radial direction, and the movement of the tread rubber is small, so heat generation and rolling resistance are lower than with bias tires, making it more durable. It has many features such as excellent abrasion resistance, minimal reduction in ground contact area, and light weight.

(発明が解決しようとする課題) ところで、ベルトを構成するコードは、その巻回操作に
際し、僅かであるが張力の作用下でタイヤ幅方向に螺旋
状に巻回されることから、当該コードには、その自然寸
法に復帰しようとする力が作用することになる。しかも
、コードの撚り方向が、タイヤ幅方向に隣接する各コー
ドで等しいことから、コードを被覆する被覆ゴムにはせ
ん断力が作用することとなる。
(Problem to be Solved by the Invention) By the way, during the winding operation, the cord constituting the belt is wound spirally in the width direction of the tire under the action of a slight tension. is subjected to a force that attempts to return it to its natural size. Moreover, since the cords are twisted in the same direction for each cord adjacent to each other in the tire width direction, shearing force acts on the rubber covering the cords.

このような残留応力の作用するタイヤを長期間に亘って
使用すると、被覆ゴムと関連するコードとの分離を生ず
るおそれが大となる。
If a tire subjected to such residual stress is used for a long period of time, there is a great possibility that the covering rubber and the associated cords will separate.

本発明は、このような問題に迄みてなされたものであり
、長期間に亘って使用しても、被覆ゴムと関連するコー
ドとの分離を生ずることのない二輪車用空気入りタイヤ
を提供することをその目的とする。
The present invention has been made in view of these problems, and it is an object of the present invention to provide a pneumatic tire for two-wheeled vehicles that does not cause separation of the covering rubber and associated cords even after long-term use. is its purpose.

(課題を解決するための手段) この課題を達成するため、本発明にあっては、一対のサ
イドウオールとトレッドとがトロイダルに連なり、これ
らの各部を、タイヤの赤道面に対して75゜〜90°の
角度範囲で有機繊維コードを一方向に配列したプライの
少なくとも一層からなるカーカスで補強し、カーカスプ
ライの両端部を、両サイドウオールの径方向内側端部に
埋設したビードリングの周りにタイヤの回転方向外側に
向かって巻き上げ、カーカスの外周に螺旋状に巻回され
てタイヤ幅方向に延在するコードからなるベルトを少な
くとも一層具える二輪車用空気入りタイヤにおいて、タ
イヤ幅方向に相互に隣接してベルトを構成するコードの
撚り方向を、互いに逆向きとしてなる。
(Means for Solving the Problem) In order to achieve this problem, in the present invention, a pair of sidewalls and a tread are connected in a toroidal manner, and each of these parts is set at an angle of 75 degrees to the equatorial plane of the tire. The carcass is reinforced with a carcass consisting of at least one layer of plies in which organic fiber cords are arranged in one direction in an angle range of 90°, and both ends of the carcass plies are wrapped around bead rings embedded in the radially inner ends of both sidewalls. A pneumatic tire for two-wheeled vehicles comprising at least one belt consisting of a cord wound outward in the rotational direction of the tire, spirally wound around the outer periphery of the carcass, and extending in the tire width direction. The adjacent cords constituting the belt are twisted in opposite directions.

(作 用) 螺旋状に巻回されてタイヤ幅方向に延在して相互に隣接
するコードの撚り方向を、互いに逆向きとしたので、そ
れらコード間に位置する被覆ゴムには、同一方向の力が
作用することとなり、残留するせん断力に起因する被覆
ゴムの分離を生ずることがない。
(Function) Since the twisted directions of the adjacent cords that are spirally wound and extend in the width direction of the tire are opposite to each other, the covering rubber located between the cords is twisted in the same direction. force is applied, and separation of the covering rubber due to residual shearing force does not occur.

(実施例) 以下、図面を参照して本発明の好適な実施例について詳
述する。
(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

第1図(a)は、この発明の好適な一実施例を示す二輪
車用空気入りタイヤの、タイヤ幅方向における断面を示
す図であり、二本で一対をなす環状のビードコア10に
、両端部が内側から外側に向かって巻き上げられたカー
カス12は、タイヤの赤道面に対して75゜〜90°の
角度範囲で有機繊維コード、例えば、66ナイロンを配
列した二枚のプライ12a及び12bを具える。
FIG. 1(a) is a cross-sectional view in the tire width direction of a pneumatic tire for a two-wheeled vehicle showing a preferred embodiment of the present invention. The carcass 12, which is rolled up from the inside to the outside, includes two plies 12a and 12b in which organic fiber cords, for example, 66 nylon, are arranged at an angle of 75° to 90° with respect to the equatorial plane of the tire. I can do it.

そして、タイヤ周方向に延在する、ここでは二本とした
周方向主溝14が形成されたトレッド16は、トロイダ
ルにサイドウオール18に連続しており、トレッド16
とカーカス12との間には、弾性率の大きな繊維、例え
ば、ハイモジュラスポリエステル、ポリビニルアルコー
ル、レーヨン、又は芳香族ポリアミド繊維から選ばれ、
弾性率が600kg / sun ”以上のコードより
なるベルト20が、タイヤ幅方向に螺旋状に巻回され、
カーカス12のタイヤ周方向における剛性の向上をもた
らす。なお、トレッド16には、タイヤの良好なる排水
性能を担保するため、その幅方向に相互に離間するとと
もに、タイヤ周方向に延在する周方向主溝14が設けら
れている。
The tread 16, in which two circumferential main grooves 14 are formed, which extend in the tire circumferential direction, is continuous to the sidewall 18 in a toroidal manner.
and the carcass 12, a fiber having a large elastic modulus, for example, selected from high modulus polyester, polyvinyl alcohol, rayon, or aromatic polyamide fiber,
A belt 20 made of a cord having an elastic modulus of 600 kg/sun'' or more is wound spirally in the width direction of the tire,
The rigidity of the carcass 12 in the tire circumferential direction is improved. In order to ensure good drainage performance of the tire, the tread 16 is provided with circumferential main grooves 14 that are spaced apart from each other in the width direction and extend in the tire circumferential direction.

ところで、ヘルド20を構成するコードは、第1図(b
)に明示したように、二本のタイヤの幅方向に互いに隣
接するコード22a 、22bの撚り方向が、矢印A、
Bでそれぞれ示したように、互いに逆向きをしている。
By the way, the code configuring the heald 20 is shown in FIG.
), the twisting directions of the cords 22a and 22b adjacent to each other in the width direction of the two tires are indicated by the arrows A,
As shown in B, they are in opposite directions.

換言すれば、一方のコード22aをZ撚りとしたならば
、それに隣接する他のコード22bの撚り方向をS撚り
とする。
In other words, if one cord 22a is Z-twisted, the other cord 22b adjacent thereto is twisted in S-twist direction.

したがって、ベル)20を形成すべく、それらコード2
2a 、22bを巻回することにより当該コードに張力
が残留し、その結果、それらコードの自然寸法への復帰
に起因してコードがその軸線周りに回転したとしても、
それぞれのコードの回転方向が 互いに逆方向となり、
それら隣接して位置するコード22a 、22b間には
、長期間に亘っても十分に無視し得るような、極めて小
さなせん断力だけが作用することになる。
Therefore, in order to form a bell) 20, those cords 2
Even if the winding of 2a, 22b leaves a tension in the cords, resulting in a rotation of the cords about their axis due to their return to their natural dimensions,
The rotation directions of each cord are opposite to each other,
Only an extremely small shearing force that can be ignored even over a long period of time acts between the adjacent cords 22a and 22b.

それゆえ、タイヤが長期間に亘って使用されたとしても
、コードを被覆するとともに、それらコード間に位置す
る被覆ゴムとコードとが分離することがなく、耐久性に
優れたタイヤを得ることができる。
Therefore, even if the tire is used for a long period of time, the cords will not separate from the covering rubber located between the cords, making it possible to obtain a tire with excellent durability. can.

〔比較例〕[Comparative example]

以下に、本発明タイヤと比較タイヤを用いた耐久性に関
する比較試験について説明する。
A comparative test regarding durability using a tire of the present invention and a comparative tire will be explained below.

◎タイヤ諸元 ・タイヤサイズ: MCR170/60R17・カーカ
ス: 1260d/2の太さのナイロンからなるコード
を、タイヤ赤道面に対し て90’をなして一層に配列。
◎Tire specifications/Tire size: MCR170/60R17/Carcass: Nylon cords with a thickness of 1260d/2 are arranged in a single layer at 90' to the tire's equatorial plane.

・ベルト 本発明タイヤ: 1500d/2の太さのケブラー(商
品名)からなる二本コー ドを、−本ずつ1ピツチずつ ずらして多条ねじのように巻 回し、各コードの撚り方向を 相互に逆向きとしたもの。
- Belt Tire of the present invention: Two cords made of Kevlar (trade name) with a thickness of 1500 d/2 are wound like a multi-thread screw, with each cord being shifted by 1 pitch, and the twisting direction of each cord is set to the same direction as the other. The one in the opposite direction.

・比較タイヤ1 : 1500d/2の太さのケブラー
(商品名)からなるコードを 螺旋状に巻回するとともに、 タイヤ幅方向に相互に隣接す る各コードの撚り方向を等し くしたもの。
Comparison Tire 1: A cord made of Kevlar (trade name) with a thickness of 1500 d/2 is wound in a spiral shape, and each cord adjacent to each other in the width direction of the tire is twisted in the same direction.

・比較タイヤ2 : 1500d/2の太さのケブラー
(商品名)からなる−本のコ ードを螺旋状に巻回したもの。
Comparison Tire 2: Made of Kevlar (trade name) with a thickness of 1500 d/2 - a spirally wound cord.

◎試験方法 上記各タイヤに2.8 kg/ ciの内圧を適用し、
100b八相当の速度で回転する回転ドラムに対して3
55 kgの負荷の作用下で押圧し、5万km相当走行
後のタイヤのベルト部の接着力を指数化して比較した。
◎Test method An internal pressure of 2.8 kg/ci was applied to each tire above.
3 for a rotating drum rotating at a speed equivalent to 100b8
The adhesion strength of the belt portion of the tire was expressed as an index and compared after being pressed under a load of 55 kg and traveling for the equivalent of 50,000 km.

なお、指数が高いものほど耐久性に優れる。Note that the higher the index, the more excellent the durability.

上記表より明らかなように、螺旋状に巻回されてタイヤ
幅方向に延在し、相互に隣接するベルトのコードの撚り
方向を互いに逆向きとすることにより、タイヤの耐久性
を向上させることができることが判る。
As is clear from the above table, tire durability is improved by twisting the cords of adjacent belts in opposite directions, which are spirally wound and extend in the width direction of the tire. It turns out that it is possible.

なお、上記実施例にあっては、互に隣接する二本のコー
ドの撚り方向を逆向きとしたが、この実施例に限定され
るものではなく、ベルトを構成するコード数を三本以上
とすることもでき、その場合にあっては、互いに隣接す
るコードの撚り方向が逆向きをなすよう、各コードをコ
ードの数より一だけ少ない数のピッチで巻回すれば良く
、特許請求の範囲内で種々の変更が可能である。
In the above embodiment, the two adjacent cords are twisted in opposite directions; however, the present invention is not limited to this embodiment, and the number of cords constituting the belt may be three or more. In that case, each cord may be wound with a pitch one less than the number of cords so that the twist directions of adjacent cords are opposite to each other, and the scope of the claims Various changes are possible within.

(発明の効果) かくしてこの発明によれば、螺旋状に巻回されてタイヤ
幅方向に延在するコードからなるベルトを有するタイヤ
の利点を損なうことなく、耐久性を向上させたタイヤを
得ることができる。
(Effects of the Invention) Thus, according to the present invention, it is possible to obtain a tire with improved durability without impairing the advantages of a tire having a belt made of a spirally wound cord extending in the width direction of the tire. I can do it.

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

第1図(a)は、本発明に係る二輪車用空気入りタイヤ
の幅方向に沿う断面を示す図、そして第1図(b)は、
第1図(a)に示すタイヤのベルトを構成する一組のコ
ードを断面にして示す図である。 10− ビードコア   12・・〜カーカス14−・
・周方向主溝   16−)レッド1B・・・サイドウ
オール 20− ベルト22 a 、 22b−一−コ
ード
FIG. 1(a) is a cross-sectional view along the width direction of the pneumatic tire for two-wheeled vehicles according to the present invention, and FIG. 1(b) is
FIG. 2 is a cross-sectional view of a set of cords constituting the belt of the tire shown in FIG. 1(a). 10- Bead core 12... ~ Carcass 14-...
・Circumferential main groove 16-) Red 1B...Side wall 20- Belt 22 a, 22 b-- Cord

Claims (1)

【特許請求の範囲】 1、一対のサイドウォールとトレッドとがトロイダルに
連なり、これらの各部を、タイヤの赤道面に対して75
゜〜90゜の角度範囲で有機繊維コードを一方向に配列
したプライの少なくとも一層からなるカーカスで補強し
、カーカスプライの両端部を、両サイドウォールの径方
向内側端部に埋設したビードリングの周りにタイヤの回
転方向外側に向かって巻き上げ、カーカスの外周に螺旋
状に巻回されてタイヤ幅方向に延在するコードからなる
ベルトを少なくとも一層具える二輪車用空気入りタイヤ
において、 タイヤ幅方向に相互に隣接してベルトを構成するコード
の撚り方向を、互いに逆向きとしたことを特徴とする二
輪車用空気入りタイヤ。
[Claims] 1. A pair of sidewalls and a tread are connected in a toroidal manner, and each of these parts is arranged at an angle of 75° with respect to the equatorial plane of the tire.
The carcass is reinforced with a carcass consisting of at least one layer of plies in which organic fiber cords are arranged in one direction in the angle range of 90 degrees, and both ends of the carcass ply are embedded in the radially inner ends of both sidewalls. A pneumatic tire for two-wheeled vehicles comprising at least one belt consisting of a cord wound outward in the rotational direction of the tire, spirally wound around the outer periphery of the carcass, and extending in the width direction of the tire. A pneumatic tire for a two-wheeled vehicle, characterized in that cords constituting a belt that are adjacent to each other are twisted in opposite directions.
JP1163725A 1989-06-28 1989-06-28 Pneumatic type for two-wheel vehicle Pending JPH0331006A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1163725A JPH0331006A (en) 1989-06-28 1989-06-28 Pneumatic type for two-wheel vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1163725A JPH0331006A (en) 1989-06-28 1989-06-28 Pneumatic type for two-wheel vehicle

Publications (1)

Publication Number Publication Date
JPH0331006A true JPH0331006A (en) 1991-02-08

Family

ID=15779479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1163725A Pending JPH0331006A (en) 1989-06-28 1989-06-28 Pneumatic type for two-wheel vehicle

Country Status (1)

Country Link
JP (1) JPH0331006A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04321402A (en) * 1991-04-23 1992-11-11 Sumitomo Rubber Ind Ltd Radial tire for motor-cycle
US6606747B1 (en) 1996-03-15 2003-08-12 Index Systems, Inc. System and method for grazing television channels from an electronic program guide

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04321402A (en) * 1991-04-23 1992-11-11 Sumitomo Rubber Ind Ltd Radial tire for motor-cycle
US6606747B1 (en) 1996-03-15 2003-08-12 Index Systems, Inc. System and method for grazing television channels from an electronic program guide
US7594243B2 (en) 1996-03-15 2009-09-22 Index Systems, Inc. System and method for grazing television channels from an electronic program guide
US8914828B2 (en) 1996-03-15 2014-12-16 Index Systems, Inc. System and method for grazing television channels from an electronic program guide

Similar Documents

Publication Publication Date Title
US4989658A (en) Belt overlay structure for pneumatic tires comprising a single ribbon wrapped about the belt structure
JP4312173B2 (en) Pneumatic tires for motorcycles
EP3898275B1 (en) Tyre for vehicle wheels
US5209794A (en) Tire for motor cycles including a spirally wound aromatic polyamide cord belt
JPH04356205A (en) Radial tire
EP1034947B1 (en) Pneumatic tires
JPH05139112A (en) Pneumatic tire
US20020026979A1 (en) Method of making pneumatic tire with tread belt
JP3083862B2 (en) Pneumatic tires for motorcycles
JP3499261B2 (en) Molding method of cable bead cord
JPH1111113A (en) Pneumatic tire and drum for molding this pneumatic tire
JP4166308B2 (en) Pneumatic tire
AU602626B2 (en) A pneumatic tire
JPH0331006A (en) Pneumatic type for two-wheel vehicle
JPH06305304A (en) Pneumatic tire
JPH08324208A (en) Pneumatic radial tire
JPH1044725A (en) Pneumatic radial tire
JPH0325005A (en) Pneumatic tire pair for two-wheeled vehicle
EP0456933A1 (en) Pneumatic tires for motorcycles
US4936366A (en) Pneumatic tire
JP3636562B2 (en) Pneumatic radial tire for passenger cars
CA1144463A (en) Pneumatic tire
JP4070314B2 (en) Heavy duty pneumatic radial tires
JP2002012011A (en) Pneumatic tire
JPH10217716A (en) Pneumatic radial tire for passenger car