JP2000158920A - Front wheel tire for two-wheeler - Google Patents

Front wheel tire for two-wheeler

Info

Publication number
JP2000158920A
JP2000158920A JP10335160A JP33516098A JP2000158920A JP 2000158920 A JP2000158920 A JP 2000158920A JP 10335160 A JP10335160 A JP 10335160A JP 33516098 A JP33516098 A JP 33516098A JP 2000158920 A JP2000158920 A JP 2000158920A
Authority
JP
Japan
Prior art keywords
tire
carcass
bead
bead ring
cord
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
JP10335160A
Other languages
Japanese (ja)
Inventor
Tsutomu Nakamura
中村  勉
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 JP10335160A priority Critical patent/JP2000158920A/en
Priority to EP99309208A priority patent/EP1004460A3/en
Priority to EP05001325A priority patent/EP1541378A1/en
Priority to US09/448,426 priority patent/US6286575B1/en
Publication of JP2000158920A publication Critical patent/JP2000158920A/en
Priority to US09/908,795 priority patent/US20020000276A1/en
Pending legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B1/00Constructional features of ropes or cables
    • D07B1/06Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606Reinforcing cords for rubber or plastic articles
    • D07B1/062Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04Bead cores
    • B60C2015/048Polygonal cores characterised by the winding sequence
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C2200/00Tyres specially adapted for particular applications
    • B60C2200/10Tyres specially adapted for particular applications for motorcycles, scooters or the like
    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B2501/00Application field
    • D07B2501/20Application field related to ropes or cables
    • D07B2501/2046Tire cords
    • D07B2501/2053Tire cords for wheel rim attachment

Landscapes

  • Ropes Or Cables (AREA)
  • Tires In General (AREA)
  • Tyre Moulding (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve handlebar responsiveness and road surface grip force while maintaining the excellent characteristic of a radial tire provided with a belt layer formed of a spirally wound cord. SOLUTION: A side wall part 1 and a tread part 2 are reinforced by a carcass 4 comprising two plies 4a, 4b of cords arranged extending at an angle of 60-90 deg. relative to the tire equator face, and both side parts of the carcass 4 are wound around bead rings 5 embedded in bead parts 3. A cord is spirally wound on the outer peripheral side of the carcass 4 to dispose a belt 6 comprising a belt layer 6a extended substantially in the circumferential direction of a tire. In this case, the bead ring 5 is composed of a laminated body of polygonal cross section formed by spirally winding a single steel wire.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、一本もしくは複
数本のコードをタイヤ幅方向へ螺旋状に巻回して、コー
ドを実質的にタイヤ周方向に延在させたベルト層を具え
る二輪車用前輪タイヤに関するものであり、とくには操
縦安定性の向上をもたらすものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle having a belt layer in which one or more cords are spirally wound in the tire width direction and the cords extend substantially in the tire circumferential direction. The present invention relates to a front wheel tire, and particularly to an improvement in steering stability.

【0002】[0002]

【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を一方向に配列させたプライ
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を、タイヤ幅方向に
進む螺旋状に巻回してなるベルト層を有する二輪車用空
気入りラジアルタイヤは、とくには、螺旋状の巻回コー
ドよりなるベルト層の、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、そのトレッド部がタイ
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お
よび転がり抵抗が小さく、耐摩耗性に優れ、また、車速
の増加に伴う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。
2. Description of the Related Art A cord having a high elastic modulus, for example, a high modulus polyester, is provided on the outer periphery of a carcass made of plies in which organic fiber cords are arranged in one direction at an angle of 75 ° to 90 ° with respect to the tire equatorial plane. Rayon, or a pneumatic radial tire for a motorcycle having a belt layer formed by spirally winding a cord made of an aromatic polyamide fiber in the tire width direction, particularly, a belt layer made of a spirally wound cord With the so-called "Taga" effect,
Even when traveling at high speeds, the tread does not protrude outward in the tire radial direction, and the movement of the tread rubber is small, so heat generation and rolling resistance are smaller than those of bias tires, and wear resistance is high. In addition, it has many features such as light weight and little decrease in the contact area with increase in vehicle speed.

【0003】[0003]

【発明が解決しようとする課題】しかるに、このような
ラジアルタイヤは、二輪車の後輪用タイヤとして用いて
好適ではあっても、それを、ハンドリング等の操縦性が
重視される前輪用タイヤとして用いる場合には、ベルト
層コードが実質的にタイヤ周方向に延在することから、
ベルト層コードが相互に交差するクロス構造ベルトを具
えるタイヤに比して、タイヤ幅方向断面でみたトレッド
踏面の曲げ剛性が低すぎ、ハンドル応答性、路面グリッ
プ力等が大きく不足するという問題があり、それ故に、
この種のラジアルタイヤは二輪車の前輪用として用いら
れることがなかった。
Although such a radial tire is suitable for use as a rear wheel tire for a motorcycle, it is used as a front wheel tire where handling and other handling characteristics are important. In this case, since the belt layer cord extends substantially in the tire circumferential direction,
Compared to a tire with a cross structure belt where the belt layer cords cross each other, the bending rigidity of the tread tread is too low in the cross section in the tire width direction, and the handle responsiveness, road surface grip force, etc. are significantly insufficient. And therefore,
Radial tires of this type have not been used for front wheels of motorcycles.

【0004】この一方で、近年の車両の軽量化および高
性能化に伴って、ハンドルシミーに対する対策が強く望
まれるに至っており、加えて高速走行時のより一層の安
定性の確保が重要な課題となっているところ、従来から
広く使用されているクロス構造ベルトを具える前輪用ラ
ジアルタイヤでは、路面の微小な凹凸によるトレッド面
の突上げおよび、それに起因するハンドルの微小振動、
すなわち、ハンドルシミーを柔軟に吸収することが難し
く、また、車両速度の増加につれをトレッドセンタ部の
迫出し量が多くなって接地面形状が減少することに起因
する、接地性の低下によって、高速走行時の安定性が低
下するという問題があった。
On the other hand, with the recent reduction in weight and performance of vehicles, measures against handle shimmy have been strongly desired, and furthermore, it is important to ensure further stability during high-speed running. However, in the case of radial tires for front wheels with a cross structure belt that has been widely used in the past, thrust up of the tread surface due to minute unevenness of the road surface and slight vibration of the steering wheel caused by it,
That is, it is difficult to flexibly absorb the steering wheel shimmy, and as the vehicle speed increases, the amount of protrusion of the tread center portion increases and the shape of the ground contact surface decreases, so that a decrease in the contact property causes a high speed. There was a problem that stability during running was reduced.

【0005】そこで、この発明は、螺旋巻回コードより
なるベルト層を具える前記ラジアルタイヤの、トレッド
部が柔軟であり、高速走行時の接地面形状の変化が少な
く、また、高速耐久性にすぐれる等の特性に着目し、そ
のタイヤの、踏面曲げ剛性が低いことに起因する、ハン
ドル応答性、踏面グリップ等の不足を、とくには、ビー
ドリングの構造の改善をもって十分に補うことで、クロ
ス構造ベルトを具える、従来の前輪用タイヤが抱える問
題点を有利に解決した二輪車用前輪タイヤを提供する。
Accordingly, the present invention provides a radial tire having a belt layer composed of a spirally wound cord, in which the tread portion is flexible, the shape of the ground contact surface at the time of high-speed running is small, and high-speed durability is improved. Focusing on characteristics such as superiority, the lack of handle responsiveness, tread grip, etc. due to the low tread bending stiffness of the tire, especially by sufficiently compensating for the improvement of the bead ring structure, A front wheel tire for a two-wheeled vehicle including a cross structure belt and advantageously solving the problems of the conventional front wheel tire.

【0006】[0006]

【課題を解決するための手段】この発明の二輪車用前輪
タイヤは、一対のサイドウォール部およびトレッド部
を、タイヤ赤道面に対して60〜90°の角度で一方向
に延在させて配置した一般的には有機繊維コードの少な
く一プライからなるカーカスによって補強するととも
に、このカーカスの、少なく一プライの両側部を、サイ
ドウォール部の半径方向内方のビード部に埋設したビー
ドリングの周りでタイヤの内側から外側に巻き返し、ま
た、カーカスの外周側に、通常は有機繊維からなる一本
のコードまたは複数本の引揃えコードを螺旋状に巻回し
て、コードを実質的にタイヤ周方向に延在させたベルト
層の一層以上からなるベルトを配設したものであり、ビ
ードリングを、横断面形状が多角形をなす、スチール単
線の螺旋巻回積層体により構成したものである。ここで
好ましくは、ビードリングの横断面形状を、一辺を底辺
とする四〜六角形のいずれかとする。
In a front wheel tire for a motorcycle according to the present invention, a pair of sidewall portions and a tread portion are arranged so as to extend in one direction at an angle of 60 to 90 ° with respect to the tire equatorial plane. In general, while reinforcing with a carcass consisting of at least one ply of organic fiber cord, both sides of at least one ply of this carcass are surrounded by a bead ring embedded in a bead part inward in the radial direction of the sidewall part. A single cord or a plurality of alignment cords, usually made of organic fibers, are spirally wound around the outer periphery of the carcass from the inside to the outside of the tire, and the cord is substantially wound in the tire circumferential direction. A belt composed of one or more extended belt layers is arranged, and the bead ring is formed into a spiral wound laminate of a single steel wire having a polygonal cross section. Ri is obtained by configuration. Here, preferably, the cross-sectional shape of the bead ring is any one of four to hexagonal shapes having one side as a base.

【0007】このタイヤのビードリングは、スチール単
線を螺旋状に巻回するとともに積層してなり、そのスチ
ール単線がリングの幅方向および半径方向のいずれの方
向にも連続していることから、ビードリングのラジアル
断面内での幅方向および、ビードリングの中心軸線の周
りの捩り方向のそれぞれに高い剛性を発揮することがで
きる。
The bead ring of this tire is formed by spirally winding and laminating a single steel wire, and the single steel wire is continuous in both the width direction and the radial direction of the ring. High rigidity can be exhibited in each of the width direction in the radial cross section of the ring and the torsion direction around the central axis of the bead ring.

【0008】従って、相互に並列配置した複数本のスチ
ール単線を渦巻き状に積層してなる従来の汎用ビードリ
ングでは、スチール単線の相互がリング幅方向に不連続
であって、ビードリングの中心軸線の周りでの捩り力、
ビードリングを通るラジアル線分の周りの曲げ力およ
び、ビードリングを通るタイヤ軸線方向線分の周りの曲
げ力等に対する剛性が低いため、そのビードリングを、
前輪用タイヤのビード部に埋設しても、そのビードリン
グは、タイヤへの荷重、横力等の作用に起因する、カー
カスコードへの引張力の作用によって、捩れ変形、曲が
り変形等を生じることになるので、トレッド踏面の、前
述したような曲げ剛性の低さを克服し得べくもないとこ
ろ、この発明に係る前記構成のビードリングは、ビード
部内でのカーカスコード引張力に対し、各方向の高い剛
性の下で高い変形抗力を発揮することができ、この結果
として、この種のタイヤの本来的な特性はそのままに、
タイヤ幅方向断面内でのトレッド踏面の曲げ剛性を大き
く高めて、ハンドル応答性、路面グリップ力等の改善の
下に、操縦安定性を十分に確保することができる。
Therefore, in a conventional general-purpose bead ring formed by spirally stacking a plurality of single steel wires arranged in parallel with each other, the single steel wires are discontinuous in the ring width direction, and the center axis of the bead ring Torsional force around
Since the bending force around the radial line segment passing through the bead ring and the bending force around the tire axial direction line segment passing through the bead ring are low, the bead ring is
Even if the bead ring is embedded in the bead part of the front wheel tire, the bead ring may cause torsional deformation, bending deformation, etc. due to the action of tensile force on the carcass cord due to the effect of load on the tire, lateral force, etc. Therefore, the bead ring having the above-described configuration according to the present invention is not capable of overcoming the low bending rigidity of the tread tread as described above. It can exhibit high deformation resistance under high rigidity, and as a result, while maintaining the original characteristics of this kind of tire,
The bending stiffness of the tread tread in the cross section in the tire width direction is greatly increased, and the steering stability can be sufficiently secured while improving the handle responsiveness, the road surface grip force, and the like.

【0009】[0009]

【発明の実施の形態】以下にこの発明の実施の形態を図
面に示すところに基づいて説明する。図1はこの発明の
実施の形態を示す幅方向断面図である。図中1は一対の
サイドウォール部を、2は、それらのサイドウォール部
1に跨がるトレッド部をそれぞれ示し、そして3は、サ
イドウォール部1の半径方向内方に位置するビード部を
示す。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view in the width direction showing an embodiment of the present invention. In the figure, 1 indicates a pair of sidewall portions, 2 indicates a tread portion straddling the sidewall portions 1, and 3 indicates a bead portion located radially inward of the sidewall portion 1. .

【0010】ここでは、タイヤ赤道面に対して60〜9
0°の角度で一方向に延在させた有機繊維コード、たと
えば66ナイロンコードの二枚のプライ4a,4bから
なるカーカス4で、両サイドウォール部1およびトレッ
ド部2を補強するとともに、このカーカス4のそれぞれ
のプライ4a,4bの両側部を、ビード部3に埋設した
ビードリング5の周りでタイヤの内側から外側へ巻き返
す。
[0010] Here, 60 to 9 with respect to the tire equatorial plane.
A carcass 4 composed of two plies 4a, 4b of an organic fiber cord, for example, 66 nylon cord, extended in one direction at an angle of 0 ° reinforces both side wall portions 1 and tread portion 2 and provides the carcass 4. 4. Both sides of each of the plies 4a, 4b of the tire 4 are wound around the bead ring 5 embedded in the bead portion 3 from the inside to the outside of the tire.

【0011】また、このようなカーカス4のクラウン部
の外周側に、弾性率の大きい有機繊維、たとえば、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、芳香族ポリアミド等の繊維からなり、弾性率が6
00kgf /mm2 以上のコードの一本もしくは、複数本の
引揃えをタイヤ幅方向に螺旋状に巻回して、コードを実
質的にタイヤ周方向に延在させたベルト層6aの、ここ
では一層からなるベルト6を配設する。かかるベルト6
は、コードの延在方向の故に、タイヤ半径方向の高い剛
性を発揮することができる。
On the outer peripheral side of the crown portion of the carcass 4, an organic fiber having a high elastic modulus, for example, a fiber of high modulus polyester, polyvinyl alcohol, rayon, aromatic polyamide or the like, having an elastic modulus of 6 is used.
One or more cords of at least 00 kgf / mm 2 are spirally wound in the tire width direction to extend the cord substantially in the tire circumferential direction. Is provided. Such a belt 6
Can exhibit high rigidity in the tire radial direction because of the extending direction of the cord.

【0012】さらにここでは、タイヤと、図示しないリ
ムとの嵌め合いを確保するビード部3に埋設したビード
リング5を、スチール単線の螺旋巻回積層体にて構成
し、それの横断面形状を多角形とする。図2は、このこ
とをより具体的に示す図であり、図2(a)に横断面図
で示すビードリング5は、スチール単線を、ビードリン
グ5の幅方向に三回螺旋巻回した後に、それの外周側に
三回螺旋巻回し、その外周側にさらに三回の螺旋巻回を
行うことで三層の積層構造として横断面輪郭形状をほぼ
正方形としたものである。また、図2に(b)に示すビ
ードリング5は、四回の螺旋巻回を四段にわたって繰返
すことでほぼ正方形の横断面形状としたものである。
Further, here, a bead ring 5 buried in a bead portion 3 for securing a fit between a tire and a rim (not shown) is constituted by a spirally wound laminated body of a single steel wire, and its cross-sectional shape is defined as follows. Polygon. FIG. 2 is a diagram showing this more specifically, and the bead ring 5 shown in a cross-sectional view in FIG. 2 (a) is obtained by spirally winding a steel single wire three times in the width direction of the bead ring 5. The spiral winding is performed three times on the outer peripheral side, and the spiral winding is further performed three times on the outer peripheral side, thereby forming a three-layer laminated structure having a substantially square cross-sectional profile. The bead ring 5 shown in FIG. 2 (b) has a substantially square cross-sectional shape by repeating four spiral windings over four steps.

【0013】図2に(c)に示すビードリング5は、半
径方向の内周側から2回、3回および2回のそれぞれの
螺旋巻回を三段にわたって繰返して、ほぼ六角形の横断
面形状とし、図2(d)に示すものは、3回、4回およ
び3回のそれぞれの螺旋巻回を繰返して、横断面形状を
ほぼ六角形としたものであり、さらに図2(e)に示す
ものは、2回、3回、4回および3回の螺旋巻回を繰返
したものである。
The bead ring 5 shown in FIG. 2 (c) has a substantially hexagonal cross section formed by repeating three, two, three, and two spiral windings from the radially inner peripheral side over three stages. The shape shown in FIG. 2D is obtained by repeating the spiral winding three times, four times, and three times, respectively, so that the cross-sectional shape is substantially hexagonal. Is obtained by repeating the spiral winding twice, three times, four times, and three times.

【0014】ここで、これらのいずれのビードリング5
も、ビード部3への埋設姿勢の下で、多角形の一辺が底
辺となるように巻回し、積層することが、ビードベース
と、リムのビードシートとの間のエアシール性を高め、
ビード部の耐リム滑り性を向上させ、また、ビード部と
リムとの強固な連結を実現する上で好ましい。なお図示
はしないが、ビードリングの横断面形状は五角形とする
ことも可能である。
Here, any of these bead rings 5
Also, winding and laminating such that one side of the polygon is the bottom side under the embedding posture in the bead portion 3 enhances the air sealing property between the bead base and the bead sheet of the rim,
This is preferable for improving the rim slip resistance of the bead portion and realizing a strong connection between the bead portion and the rim. Although not shown, the cross-sectional shape of the bead ring may be a pentagon.

【0015】以上のように構成してなるラジアルタイヤ
によれば、ビードリングが、先にも述べたように、ラジ
アル断面内での幅方向および、ビードリングが軸線周り
の捩り方向のそれぞれに、ともに高い剛性を有すること
になり、これにより、タイヤ幅方向断面内でのトレッド
踏面の曲げ剛性が有利に増加されるので、このタイヤを
前輪に用いた場合には、タイヤに固有の特性を損ねるこ
となく、操縦安定性を大きく高めることができる。
According to the radial tire configured as described above, as described above, the bead ring is formed in the width direction in the radial cross section and the bead ring is formed in the torsional direction around the axis, respectively. Both have high rigidity, and thereby, the flexural rigidity of the tread tread in the cross section in the tire width direction is advantageously increased, so that when this tire is used for the front wheel, characteristics inherent to the tire are impaired. Without this, steering stability can be greatly improved.

【0016】[0016]

【実施例】図1に示す構造を有し、カーカスを、タイヤ
赤道面に対して80°をなすナイロンコードの二枚のプ
ライで構成するとともに、ベルトを、芳香族ポリアミド
繊維コードからなる一層のベルト層で構成した、サイズ
が120/70 ZR17のタイヤを車両(HONDA
CBR1100XX)の前輪に装着して、高速直進安
定性、耐シミー性、軽快性および応答性、旋回力および
路面グリップ力、ならびに乗り心地を、プロのテストド
ライバの、実車走行に基づくフィーリングによって評価
したところ、表1に示す通りとなった。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A carcass having the structure shown in FIG. 1 is constituted by two plies of a nylon cord forming an angle of 80.degree. With respect to the tire equatorial plane, and a belt is made of a layer of an aromatic polyamide fiber cord. A tire having a size of 120/70 ZR17 composed of a belt layer is mounted on a vehicle (HONDA).
(CBR1100XX) mounted on the front wheels to evaluate high-speed straight-running stability, shimmy resistance, lightness and responsiveness, turning force and road grip force, and riding comfort based on the feeling of a professional test driver based on actual vehicle driving As a result, the results are as shown in Table 1.

【0017】なお表中の指数値は大きいほどすぐれた結
果を示すものとする。また、実施例1のタイヤは、ビー
ドリングを図2(b)に示す構成としたものであり、実
施例2のタイヤは、図2(c)に示す構成のビードリン
グを具えるもので、実施例3のタイヤは、図2(d)に
示す構成のビードリングを具えるものである。これに対
し、従来例のタイヤは、並列配置した四本のスチール単
線を渦巻き状に四層に積層したビードリングを具えるも
のであり、他の全ての構成を実施例タイヤと同一とした
ものである。
The larger the index value in the table, the better the result. The tire of Example 1 has a bead ring having the configuration shown in FIG. 2B, and the tire of Example 2 has a bead ring having the configuration shown in FIG. 2C. The tire according to the third embodiment has a bead ring having the configuration shown in FIG. On the other hand, the conventional tire has a bead ring in which four steel single wires arranged in parallel are spirally laminated in four layers, and all other configurations are the same as the example tire. It is.

【0018】[0018]

【表1】 [Table 1]

【0019】[0019]

【発明の効果】上記実施例からも明らかなように、この
発明によれば、とくには、ビードリングを、横断面輪郭
形状が多角形をなす、スチール単線の螺旋巻回積層体に
て構成することにより、実質的にタイヤ周方向に延びる
螺旋巻回コードによってベルト層を構成してなるラジア
ルタイヤに固有の各種特性を損ねることなしに、ハンド
ル応答性、路面グリップ力等を有利に向上させてすぐれ
た操縦安定性をもたらすことができ、従って、従来技術
に比して高速直進安定性を十分に高め、ハンドルシミー
の発生を効果的に防止することができる。
As is apparent from the above embodiment, according to the present invention, in particular, the bead ring is constituted by a spiral wound laminated body of a single steel wire having a polygonal cross section. Thereby, the steering wheel responsiveness, the road surface grip force and the like can be advantageously improved without impairing various characteristics inherent in the radial tire formed of the belt layer by the spirally wound cord extending substantially in the tire circumferential direction. Excellent steering stability can be provided, and therefore, high-speed straight-running stability can be sufficiently increased as compared with the related art, and the occurrence of handle shimming can be effectively prevented.

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

【図1】この発明の実施の形態を示す幅方向断面図であ
る。
FIG. 1 is a cross-sectional view in the width direction showing an embodiment of the present invention.

【図2】ビードリングの構成態様を示す図である。FIG. 2 is a diagram showing a configuration of a bead ring.

【符号の説明】[Explanation of symbols]

1 サイドウォール部 2 トレッド部 3 ビード部 4 カーカス 4a,4b プライ 5 ビードリング 6 ベルト 6a ベルト層 DESCRIPTION OF SYMBOLS 1 Side wall part 2 Tread part 3 Bead part 4 Carcass 4a, 4b Ply 5 Bead ring 6 Belt 6a Belt layer

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) D07B 1/06 D07B 1/06 // B29D 30/48 B29D 30/48 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) D07B 1/06 D07B 1/06 // B29D 30/48 B29D 30/48

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 一対のサイドウォール部およびトレッド
部を、タイヤ赤道面に対して60〜90°の角度で一方
向に延在させて配置したコードの少なく一プライからな
るカーカスにより補強するとともに、このカーカスの少
なく一プライの両側部を、サイドウォール部の半径方向
内方のビード部に埋設したビードリングの周りでタイヤ
の内側から外側へ巻き返し、カーカスの外周側に、一本
もしくは、複数本の引揃えコードを螺旋状に巻回して、
コードを実質的にタイヤ周方向に延在させたベルト層の
一層以上からなるベルトを配設した二輪車用空気入りタ
イヤであり、 ビードリングを、横断面形状が多角形をなす、スチール
単線の螺旋巻回積層体により構成してなる二輪車用前輪
タイヤ。
1. A pair of sidewall portions and a tread portion are reinforced with a carcass composed of at least one ply of cords arranged so as to extend in one direction at an angle of 60 to 90 ° with respect to the tire equatorial plane, and At least one ply of both sides of this carcass is wrapped around the bead ring embedded in the radially inner bead portion of the sidewall portion from the inside of the tire to the outside, and one or more of the carcass is wrapped around the outer periphery of the carcass. Spirally winding the alignment code of
A pneumatic tire for a motorcycle in which a belt comprising at least one belt layer having a cord extending substantially in the tire circumferential direction is provided, wherein a bead ring has a polygonal cross-sectional shape, and a single-wire spiral of steel. A front wheel tire for a motorcycle, comprising a wound laminate.
【請求項2】 ビードリングの横断面形状を、一辺を底
辺とする四〜六角形のいずれかとしてなる請求項1に記
載の二輪車用前輪タイヤ。
2. The motorcycle front wheel tire according to claim 1, wherein the cross-sectional shape of the bead ring is one of four to six-sided with one side being a base.
JP10335160A 1998-11-26 1998-11-26 Front wheel tire for two-wheeler Pending JP2000158920A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP10335160A JP2000158920A (en) 1998-11-26 1998-11-26 Front wheel tire for two-wheeler
EP99309208A EP1004460A3 (en) 1998-11-26 1999-11-18 Pneumatic tire for front wheel of motorcycle
EP05001325A EP1541378A1 (en) 1998-11-26 1999-11-18 Pneumatic tire front wheel of motorcycle
US09/448,426 US6286575B1 (en) 1998-11-26 1999-11-24 Pneumatic tire for front wheel of motorcycle
US09/908,795 US20020000276A1 (en) 1998-11-26 2001-07-20 Pneumatic tire for front wheel of motorcycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10335160A JP2000158920A (en) 1998-11-26 1998-11-26 Front wheel tire for two-wheeler

Publications (1)

Publication Number Publication Date
JP2000158920A true JP2000158920A (en) 2000-06-13

Family

ID=18285449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10335160A Pending JP2000158920A (en) 1998-11-26 1998-11-26 Front wheel tire for two-wheeler

Country Status (1)

Country Link
JP (1) JP2000158920A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100801482B1 (en) * 2000-08-30 2008-02-12 가부시키가이샤 고마쓰 세이사쿠쇼 Crawler belt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100801482B1 (en) * 2000-08-30 2008-02-12 가부시키가이샤 고마쓰 세이사쿠쇼 Crawler belt

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