JP2000062416A - Pneumatic tire for passenger car - Google Patents

Pneumatic tire for passenger car

Info

Publication number
JP2000062416A
JP2000062416A JP10237577A JP23757798A JP2000062416A JP 2000062416 A JP2000062416 A JP 2000062416A JP 10237577 A JP10237577 A JP 10237577A JP 23757798 A JP23757798 A JP 23757798A JP 2000062416 A JP2000062416 A JP 2000062416A
Authority
JP
Japan
Prior art keywords
reinforcing
tire
outer peripheral
layer
layers
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.)
Granted
Application number
JP10237577A
Other languages
Japanese (ja)
Other versions
JP3884866B2 (en
Inventor
Koujirou Daishiyou
康次郎 大聖
Shuichi Tsukada
修一 塚田
Kazutomo Saneto
和致 実藤
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.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co 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 Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP23757798A priority Critical patent/JP3884866B2/en
Publication of JP2000062416A publication Critical patent/JP2000062416A/en
Application granted granted Critical
Publication of JP3884866B2 publication Critical patent/JP3884866B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0072—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with ply reverse folding, i.e. carcass layer folded around the bead core from the outside to the inside

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To further increase steering stability while maintaining load durability at a conventional level or higher. SOLUTION: This tire includes two carcass layers 4A and 4B disposed between left and right bead portions 2 and 2 having bead cores 5 buried therein. Both ends 4a of the inner peripheral side carcass layer 4A are wound up from a tire inner side to the outside around the bear core 5, both ends 4b of the outer peripheral side carcass layer 4B are wound down from the tire outside around the bead core 5 in the outside of both ends 4a of the inner peripheral side carcass layer, and two reinforcing layers 9A and 9B having reinforcing cords made of aromatic polyamide fibers and disposed to be inclined in a tire circumferential direction are provided such that the reinforcing cords thereof cross each other. The outer and inner peripheral ends of the reinforcing layers 9A and 9B are arranged by being shifted from each other, and the outer peripheral ends thereof are extended to positions of 45 to 65% of a tire section height H.

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】本発明は、乗用車用空気入り
タイヤに関し、更に詳しくは、荷重耐久性を従来と同等
レベル以上確保しながら操縦安定性の改善を図るように
した乗用車用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 for a passenger vehicle, and more particularly to a pneumatic tire for a passenger vehicle which is designed to improve driving stability while ensuring load durability equal to or higher than a conventional level. .

【０００２】[0002]

【従来の技術】従来、２層のカーカス層を配置した乗用
車用空気入りタイヤにおいて、ビードコアの周りに折り
返されたカーカス層両端部に隣接して補強層を配設する
ことにより、高荷重負荷走行時や高速走行時の耐久性、
操縦安定性を向上するようにしている。2. Description of the Related Art Conventionally, in a pneumatic tire for a passenger vehicle in which two carcass layers are arranged, a reinforcing layer is disposed adjacent to both ends of the carcass layer folded around a bead core to allow running under high load. Durability during high speeds and
It is designed to improve steering stability.

【０００３】上記のような補強層として、例えば、スチ
ールコードを配列した補強層を用いる提案がある。しか
し、このようにスチールコードを使用した補強層では、
操縦安定性を更に改善するため、その外周端をタイヤ断
面高さの４５％を越えてタイヤ外径側に延在させると、
高荷重負荷走行時にその外周端が剥離故障を起こし易く
なり、荷重耐久性が悪化するという問題があった。As a reinforcing layer as described above, for example, there is a proposal to use a reinforcing layer in which steel cords are arranged. However, in the reinforcement layer using the steel cord like this,
In order to further improve the steering stability, if the outer peripheral end of the tire extends beyond 45% of the tire cross-sectional height toward the tire outer diameter side,
There is a problem in that the outer peripheral edge of the tire tends to cause a peeling failure during running under a high load, and the load durability deteriorates.

【０００４】[0004]

【発明が解決しようとする課題】本発明の目的は、荷重
耐久性を従来レベル以上に維持しながら操縦安定性を一
層高めることが可能な乗用車用空気入りタイヤを提供す
ることにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a pneumatic tire for a passenger vehicle capable of further improving steering stability while maintaining load durability at a level not lower than conventional levels.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成する本発
明の乗用車用空気入りタイヤは、ビードコアを埋設した
左右のビード部間に２層のカーカス層を配置した乗用車
用空気入りタイヤにおいて、内周側のカーカス層両端部
を前記ビードコアの周りにタイヤ内側から外側に巻き上
げる一方、外周側のカーカス層両端部を前記内周側のカ
ーカス層両端部の外側にして前記ビードコアの周りにタ
イヤ外側から内側に巻き下げ、前記内周側及び外周側の
カーカス層両端部の間に芳香族ポリアミド繊維からなる
補強コードをタイヤ周方向に対し傾斜して配列した２層
の補強層を、その補強コードが交差するように設けると
共に、それら補強層の外周端及び内周端をそれぞれずら
して配置し、かつその外周端をタイヤ断面高さＨの４５
〜６５％となる位置まで延在させたことを特徴とする。The pneumatic tire for passenger cars of the present invention which achieves the above object is a pneumatic tire for passenger cars in which two carcass layers are arranged between the left and right bead portions in which bead cores are embedded. While winding both ends of the carcass layer on the peripheral side from the tire inside to the outside around the bead core, both ends of the carcass layer on the outer peripheral side are made outside of both ends of the carcass layer on the inner peripheral side and from the tire outside around the bead core. The reinforcing cords are wound inward, and two reinforcing layers in which reinforcing cords made of aromatic polyamide fiber are arranged between the both ends of the carcass layer on the inner peripheral side and the outer peripheral side are inclined with respect to the tire circumferential direction are The reinforcing layer is provided so as to intersect with each other, and the outer peripheral edge and the inner peripheral edge of the reinforcing layers are displaced from each other, and the outer peripheral edge of the reinforcing layer has a tire sectional height H of 45.
It is characterized in that it is extended to a position of ~ 65%.

【０００６】また、本発明の他の乗用車用空気入りタイ
ヤは、ビードコアを埋設した左右のビード部間に２層の
カーカス層を配置した乗用車用空気入りタイヤにおい
て、内周側のカーカス層両端部を前記ビードコアの周り
にタイヤ内側から外側に巻き上げる一方、外周側のカー
カス層両端部を前記内周側のカーカス層両端部の外側に
して前記ビードコアの周りにタイヤ外側から内側に巻き
下げ、前記内周側及び外周側のカーカス層両端部の間に
スチールコードからなる補強コードをタイヤ周方向に対
し傾斜して配列した１層の補強層とその外側の芳香族ポ
リアミド繊維からなる補強コードをタイヤ周方向に対し
傾斜して配列した１層の補強層とを、その補強コードが
交差するように設け、それら補強層の外周端及び内周端
をそれぞれずらして配置すると共に、芳香族ポリアミド
繊維からなる補強コードを有する補強層の外周端をスチ
ールコードからなる補強コードを有する補強層のそれよ
りもタイヤ外径側となるように配置し、その両補強層の
外周端をタイヤ断面高さＨの４５〜６５％となる位置ま
で延在させたことを特徴とする。Further, another pneumatic tire for passenger cars of the present invention is a pneumatic tire for passenger cars in which two carcass layers are disposed between the left and right bead portions in which bead cores are embedded, and both end portions of the carcass layer on the inner peripheral side are provided. Is wound up from the tire inner side to the outer side around the bead core, while the carcass layer both ends on the outer peripheral side are made to be outside of the carcass layer both ends on the inner peripheral side, and the inner side is wound down from the tire outer side to the inner side around the bead core. A reinforcing cord made of steel cord is arranged between the both ends of the carcass layer on the circumferential side and the outer circumferential side so as to be inclined with respect to the tire circumferential direction, and a reinforcing cord made of aromatic polyamide fiber on the outer side of the reinforcing layer is provided on the tire circumferential side. One reinforcing layer arranged so as to be inclined with respect to the direction is provided so that the reinforcing cords intersect with each other, and the outer peripheral edge and the inner peripheral edge of the reinforcing layers are offset from each other. Along with that, the outer peripheral end of the reinforcing layer having a reinforcing cord made of an aromatic polyamide fiber is arranged so as to be closer to the tire outer diameter side than that of the reinforcing layer having a reinforcing cord made of a steel cord. It is characterized in that the outer peripheral edge is extended to a position where it becomes 45 to 65% of the tire cross-section height H.

【０００７】上記のように本発明は、芳香族ポリアミド
繊維からなる補強コードを配列した補強層をカーカス層
の両端部側間に配置することにより、該補強層をタイヤ
断面高さＨの４５％を越えてタイヤ外径側に延在させて
も、スチールコードを配列したような硬い補強層ではな
いため、高荷重負荷走行時にその外周端が容易にゴムと
剥離する剥離故障を招くことがない。そのため、荷重耐
久性を悪化させないばかりか、その改善を行うことがで
きる。As described above, according to the present invention, the reinforcing layer in which the reinforcing cords made of the aromatic polyamide fiber are arranged is arranged between both end sides of the carcass layer, so that the reinforcing layer is 45% of the tire section height H. Even if it extends over the outer diameter side of the tire, it is not a hard reinforcing layer like a steel cord arranged, so the outer peripheral edge does not easily peel off from the rubber when running under a high load, so it does not cause a peeling failure. . Therefore, not only the load durability is not deteriorated, but also the load durability can be improved.

【０００８】また、芳香族ポリアミド繊維からなる補強
コードをタイヤ周方向に対し傾斜して配列した２層の補
強層を、その補強コードが交差するように設け、その外
周端をタイヤ断面高さＨの４５〜６５％となる位置まで
延在させることにより、サイドウォール部３の曲げ剛性
を高い範囲にわたって高めることができ、それによっ
て、操縦安定性を一層改善することが可能になる。Further, two reinforcing layers in which reinforcing cords made of aromatic polyamide fiber are arranged to be inclined with respect to the tire circumferential direction are provided so that the reinforcing cords intersect each other, and the outer peripheral end thereof has a tire sectional height H. It is possible to increase the bending rigidity of the sidewall portion 3 over a high range by extending it to a position where it becomes 45 to 65%, and thereby, it is possible to further improve the steering stability.

【０００９】その上、それら補強層の外周端と内周端を
共にずらすようにしているため、２層の補強層の端末一
致による大きな段差に応力集中が起こるのを回避するこ
とができるので、補強層の端末剥離を容易に招くことが
ない。また、２層配置したカーカス層の内、内側のカー
カス層両端部をビードコアの周りにタイヤ内側から外側
に巻き上げる一方で、外側のカーカス層両端部をタイヤ
外側から内側に巻き下げる構造にすることで、内側のカ
ーカス層両端部を外側のカーカス層でカバーし、２層共
にタイヤ内側から外側に巻き上げた構造のように、カー
カス層のエッジがカバーさせれずにタイヤ外側に位置す
ることがないので、高速走行時のスタンティングウェー
ブ現象によりカーカス層両端部とサイドウォール部のゴ
ムとの間で生じる大きな剪断力によって、カーカス層端
部がサイドウォール部のゴムから剥離しようとするのを
効果的に抑えることができる。Moreover, since the outer peripheral edge and the inner peripheral edge of the reinforcing layers are both displaced, it is possible to avoid stress concentration on a large step due to the end matching of the two reinforcing layers. The peeling of the reinforcing layer at the end is not easily caused. Further, in the carcass layer arranged in two layers, both ends of the inner carcass layer are wound around the bead core from the inside of the tire to the outside, while both ends of the outer carcass layer are wound from the outside of the tire to the inside. Since both ends of the inner carcass layer are covered with the outer carcass layer and both layers are wound up from the tire inner side to the outer side, the edge of the carcass layer is not covered and is not located on the tire outer side. The large shearing force generated between the ends of the carcass layer and the rubber of the sidewall due to the stunting wave phenomenon during high-speed running effectively prevents the ends of the carcass layer from peeling from the rubber of the sidewall. be able to.

【００１０】一方、芳香族ポリアミド繊維からなる補強
コードを配列した上記２層の補強層に代えて、タイヤ外
側から内側に巻き下げた外側のカーカス層両端部とタイ
ヤ内側から外側に巻き上げた内側のカーカス層両端部と
の間に、タイヤ内側にスチールコードからなる補強コー
ドを配列した１層の補強層を配置し、その外側に芳香族
ポリアミド繊維からなる補強コードを配列した１層の補
強層を配置すると共に、芳香族ポリアミド繊維からなる
補強コードを有する補強層の外周端をスチールコードか
らなる補強コードを有する補強層のそれよりもタイヤ外
径側となるようにずらして配置し、内側のスチールコー
ド補強層の外周端を外側のカーカス層と外側の補強層の
２層で保護するようにしたので、スチールコード補強層
を用いた場合であっても、それらの補強層をタイヤ断面
高さＨの４５％を越えてタイヤ外径側に延在させ、高荷
重負荷走行してもその外周端が容易にゴムと剥離するこ
とがなく、従来と同等レベルの荷重耐久性を得ることが
できる。On the other hand, instead of the above-mentioned two layers of reinforcing layers in which reinforcing cords made of aromatic polyamide fibers are arranged, both ends of the outer carcass layer wound down from the tire outer side to the inner side and inner side wound up from the tire inner side to the outer side. Between the both ends of the carcass layer, one layer of reinforcing cords made of steel cords is arranged on the inside of the tire, and one layer of reinforcing cords made of aromatic polyamide fibers is arranged on the outside thereof. Along with the arrangement, the outer peripheral end of the reinforcing layer having the reinforcing cord made of aromatic polyamide fiber is arranged so as to be on the tire outer diameter side with respect to that of the reinforcing layer having the reinforcing cord made of steel cord, and the inner steel Since the outer peripheral end of the cord reinforcing layer is protected by the two layers of the outer carcass layer and the outer reinforcing layer, when the steel cord reinforcing layer is used. Even if the reinforcing layers are extended to the tire outer diameter side beyond 45% of the tire cross-sectional height H, the outer peripheral edge thereof is not easily separated from the rubber even when running under a high load, The same level of load durability as can be obtained.

【００１１】また、両補強層をその補強コードが交差す
るように設け、その両補強層の外周端をタイヤ断面高さ
Ｈの４５〜６５％となる位置まで延在させたので、サイ
ドウォール部の曲げ剛性を広い範囲にわたって大きくす
ることができ、操縦安定性を一層向上することができ
る。Further, since both reinforcing layers are provided so that the reinforcing cords intersect with each other, and the outer peripheral ends of both the reinforcing layers are extended to a position which is 45 to 65% of the tire sectional height H, the sidewall portion is formed. It is possible to increase the bending rigidity of the vehicle over a wide range and further improve the steering stability.

【００１２】[0012]

【発明の実施の形態】以下、本発明の構成について添付
の図面を参照しながら詳細に説明する。図１は本発明の
乗用車用空気入りタイヤの一例を示し、１はトレッド
部、２はビード部、３はサイドウォール部である。左右
のビード部２に連接してタイヤ外径側に左右のサイドウ
ォール部３が延設され、この左右のサイドウォール部３
間にタイヤ周方向に延在するトレッド部１が設けられて
いる。DETAILED DESCRIPTION OF THE INVENTION The configuration of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an example of a pneumatic tire for passenger cars according to the present invention, where 1 is a tread portion, 2 is a bead portion, and 3 is a sidewall portion. Left and right sidewall portions 3 are connected to the left and right bead portions 2 and extend toward the tire outer diameter side.
A tread portion 1 extending in the tire circumferential direction is provided therebetween.

【００１３】タイヤの内側には、左右のビード部２間に
わたってナイロンコードやレーヨンコード等のテキスタ
イルコードをタイヤ径方向に配列した２層のカーカス層
４Ａ，４Ｂが配置されている。左右のビード部２にはビ
ードコア５がそれぞれ埋設され、そのビードコア５の外
周にはビードフィラー６が配設されている。カーカス層
外周側のトレッド部１には複数のベルト層７が埋設さ
れ、そのベルト層７上には、ベルト層７を全面にわたっ
て保護するベルトカバー層８が設けられている。ＣＬは
タイヤセンターラインである。Inside the tire, two carcass layers 4A and 4B in which textile cords such as nylon cords and rayon cords are arranged in the tire radial direction are arranged between the right and left bead portions 2. A bead core 5 is embedded in each of the left and right bead portions 2, and a bead filler 6 is provided on the outer periphery of the bead core 5. A plurality of belt layers 7 are embedded in the tread portion 1 on the outer peripheral side of the carcass layer, and a belt cover layer 8 that protects the belt layer 7 over the entire surface is provided on the belt layer 7. CL is a tire center line.

【００１４】本発明では、上記のような構成の空気入り
タイヤにおいて、内周側のカーカス層４Ａの両端部４ａ
が、ビードコア５の周りにビードフィラー６を挟み込む
ようにしてタイヤ内側から外側に折り返されて巻き上げ
られ、サイドウォール部３に沿ってその中央部までタイ
ヤ外径側に延在している。外周側のカーカス層４Ｂの両
端部４ｂは、内周側のカーカス層両端部４ａの外側でビ
ードコア５の周りにタイヤ外側から内側に巻き下げら
れ、そのエッジ４b'がビードコア５の内端側でかつタイ
ヤ内側まで延在している。According to the present invention, in the pneumatic tire having the above structure, both end portions 4a of the carcass layer 4A on the inner peripheral side are formed.
However, the bead filler 6 is sandwiched around the bead core 5 and folded back from the tire inner side to the outer side and wound up, and extends along the sidewall portion 3 to the central portion thereof toward the tire outer diameter side. Both ends 4b of the outer peripheral side carcass layer 4B are wound around the bead core 5 from the tire outer side to the inner side outside the inner peripheral side carcass layer both ends 4a, and their edges 4b 'are on the inner end side of the bead core 5. And it extends to the inside of the tire.

【００１５】ビードフィラー６のタイヤ外側で上記内周
側及び外周側のカーカス層両端部４ａ，４ｂの間には、
芳香族ポリアミド繊維からなる補強コードを配列した２
層の補強層９Ａ，９Ｂが介設されている。この環状に形
成される補強層９Ａ，９Ｂは、タイヤ周方向に対し傾斜
して配列された補強コードが交差するように設けられて
いる。On the outer side of the tire of the bead filler 6, between the inner and outer carcass layer end portions 4a and 4b,
Arrangement of reinforcing cords made of aromatic polyamide fiber 2
Reinforcing layers 9A and 9B are interposed. The annular reinforcing layers 9A and 9B are provided so that the reinforcing cords arranged obliquely with respect to the tire circumferential direction intersect.

【００１６】補強層９Ａ，９Ｂの外周端９a1，９b1は、
ビードフィラー６の外周端６ａを越えてタイヤ外径側に
延在する一方、内周側のカーカス層両端部４ａのエッジ
４a'よりもタイヤ内径側で、ビードヒールａからトレッ
ド部表面頂部までのタイヤ径方向長さであるタイヤ断面
高さＨの４５〜６５％となる位置まで延在するようにな
っている（補強層の高さｈ＝０．４５〜０．６５Ｈ）。The outer peripheral ends 9a 1 and 9b 1 of the reinforcing layers 9A and 9B are
A tire extending from the outer diameter end 6a of the bead filler 6 toward the tire outer diameter side, on the tire inner diameter side from the edge 4a 'of the carcass layer both end portions 4a on the inner circumference side, from the bead heel a to the top of the tread surface. It is designed to extend to a position that is 45 to 65% of the tire cross-section height H that is the radial length (height h of the reinforcing layer = 0.45 to 0.65H).

【００１７】また、補強層９Ａ，９Ｂの外周端９a1，９
b1及び内周端９a2，９b2は、共にずらして配置され、図
１，２では、内側の補強層９Ａの外周端９a1が外側の補
強層９Ｂの外周端９b1よりもタイヤ外径側に位置する一
方、外側の補強層９Ｂの内周端９b2は内側の補強層９Ａ
の内周端９a2よりもタイヤ内径側に位置している。Further, the outer peripheral ends 9a 1 , 9 of the reinforcing layers 9A, 9B are
b 1 and the inner peripheral edges 9a 2 and 9b 2 are arranged so as to be offset from each other, and in FIGS. 1 and 2, the outer peripheral edge 9a 1 of the inner reinforcing layer 9A is outside the outer peripheral edge 9b 1 of the outer reinforcing layer 9B. The inner peripheral edge 9b 2 of the outer reinforcing layer 9B is located on the radial side, while the inner peripheral edge 9b 2 is located on the inner reinforcing layer 9A.
Is located on the tire inner diameter side with respect to the inner peripheral end 9a 2 .

【００１８】このように本発明は、スチールコードを配
列した硬い補強層ではなく、芳香族ポリアミド繊維から
なる補強コードを配列した補強層をカーカス層４Ａ，４
Ｂの両端部４ａ，４ｂ間に用いることにより、該補強層
をタイヤ断面高さＨの４５％を越えてタイヤ外径側に延
在させても、高荷重負荷走行時にその外周端が容易に剥
離故障を起こすことがなく、荷重耐久性を低下させない
ばかりか、その改善も図ることができる。As described above, according to the present invention, the reinforcing layer having the reinforcing cords made of the aromatic polyamide fiber is not the hard reinforcing layer having the steel cords arranged but the carcass layers 4A and 4A.
By using between the both end portions 4a and 4b of B, even if the reinforcing layer is extended to the tire outer diameter side beyond 45% of the tire cross-sectional height H, the outer peripheral end of the tire easily runs at high load running. Not only peeling failure does not occur, load durability is not lowered, but also improvement can be achieved.

【００１９】また、芳香族ポリアミド繊維からなる補強
コードをタイヤ周方向に対し傾斜して配列した２層の補
強層９Ａ，９Ｂを、その補強コードが交差するように設
けると共に、その外周端９a1，９b1をタイヤ断面高さＨ
の４５〜６５％となる位置まで延在させたので、サイド
ウォール部３の曲げ剛性を従来よりも広い範囲にわたっ
て高めることができ、それによって操縦安定性を更に高
くすることができる。Two reinforcing layers 9A and 9B in which reinforcing cords made of aromatic polyamide fiber are arranged so as to be inclined with respect to the tire circumferential direction are provided so that the reinforcing cords cross each other, and the outer peripheral end 9a 1 thereof is provided. , 9b 1 to the tire cross-section height H
The bending rigidity of the sidewall portion 3 can be increased over a wider range than in the past, and the steering stability can be further increased.

【００２０】しかも、それら補強層９Ａ，９Ｂの外周端
９a1，９b1及び内周端９a2，９b2をずらして配置してい
るので、２層の補強層９Ａ，９Ｂの端末が一致したよう
な大きな段差によって起こる応力の集中を回避し、補強
層９Ａ，９Ｂの端末剥離を抑制することができる。Moreover, since the outer peripheral ends 9a 1 and 9b 1 and the inner peripheral ends 9a 2 and 9b 2 of the reinforcing layers 9A and 9B are arranged so as to be offset from each other, the ends of the two reinforcing layers 9A and 9B coincide with each other. Concentration of stress caused by such a large step can be avoided, and peeling of the reinforcing layers 9A and 9B at the ends can be suppressed.

【００２１】また、２層配置したカーカス層４Ａ，４Ｂ
の内、内側のカーカス層４Ａの両端部４ａをビードコア
５の周りにタイヤ内側から外側に巻き上げ、外側のカー
カス層４Ｂの両端部４ｂをタイヤ外側から内側に巻き下
げる、所謂１ー１ＰＬ（プライロック）構造にすること
により、内側のカーカス層４Ａの両端部４ａをカーカス
層４Ｂで保護し、２層共にタイヤ内側から外側に巻き上
げた所謂２ー０ＰＬ（プライロック）構造のように、カ
ーカス層のエッジが保護されることなくタイヤ外側に位
置することがないので、高速走行時のスタンティングウ
ェーブ現象によりカーカス層端部とサイドウォール部３
のゴムとの間で剪断力が作用しても、該カーカス層端部
がサイドウォール部３のゴムから剥離する剥離故障が容
易に発生することがない。The carcass layers 4A and 4B arranged in two layers
Among these, both end portions 4a of the inner carcass layer 4A are wound around the bead core 5 from the tire inner side to the outer side, and both end portions 4b of the outer carcass layer 4B are wound down from the tire outer side to the inner side, so-called 1-1PL (ply lock). ) Structure, both end portions 4a of the inner carcass layer 4A are protected by the carcass layer 4B, and both layers are wound up from the tire inner side to the outer side, that is, a so-called 2-0PL (ply-lock) structure. Since the edge is not protected and not located outside the tire, the carcass layer end portion and the sidewall portion 3 due to the stunting wave phenomenon during high-speed running.
Even if a shearing force is applied between the rubber and the rubber, the peeling failure in which the end portion of the carcass layer is peeled from the rubber of the sidewall portion 3 does not easily occur.

【００２２】上記補強層９Ａ，９Ｂの外周端９a1，９b1
がタイヤ断面高さＨの４５％よりも低いと、操縦安定性
を改善することが困難になり、逆に６５％を越えると、
外周端９a1，９b1における歪み変形が大きくなり、剥離
故障を招き易くなる。本発明では、上記補強層９Ａ，９
Ｂの補強コードの傾斜角度θとしては、タイヤ周方向に
対し４０°＜θ＜６５°にすることができる。傾斜角度
θが４０°以下であっても６５°以上になっても、補強
効果が小さく、操縦安定性を改善することが難しくな
る。Outer peripheral edges 9a 1 and 9b 1 of the reinforcing layers 9A and 9B
Is less than 45% of the tire cross-section height H, it becomes difficult to improve steering stability, and conversely, when it exceeds 65%,
The strain deformation at the outer peripheral edges 9a 1 and 9b 1 becomes large, which easily causes a peeling failure. In the present invention, the reinforcing layers 9A, 9
The inclination angle θ of the reinforcing cord B can be 40 ° <θ <65 ° with respect to the tire circumferential direction. Whether the inclination angle θ is 40 ° or less or 65 ° or more, the reinforcing effect is small and it is difficult to improve the steering stability.

【００２３】外側の補強層９Ｂの内周端９b2の位置とし
ては、側面視においてビードコア５の外周端５ａ近傍に
位置させるのがよく、また、内側の補強層９Ａの外周端
９a1の位置は、ビードフィラー６の外周端６ａからタイ
ヤ外径側に８〜１５mmの範囲に位置させることができ
る。The position of the inner peripheral edge 9b 2 of the outer reinforcing layer 9B is preferably located in the vicinity of the outer peripheral edge 5a of the bead core 5 in a side view, and the position of the outer peripheral edge 9a 1 of the inner reinforcing layer 9A. Can be positioned in the range of 8 to 15 mm from the outer peripheral end 6a of the bead filler 6 to the tire outer diameter side.

【００２４】図３は、本発明の他の例を示し、上述した
芳香族ポリアミド繊維からなる補強コードを有する補強
層９Ａ，９Ｂに代えて、スチールコードからなる補強コ
ードをタイヤ周方向に対し傾斜して配列した１層の補強
層１０Ａと、芳香族ポリアミド繊維からなる補強コード
をタイヤ周方向に対し傾斜して配列した１層の補強層１
０Ｂとをその補強コードが交差するように配置したもの
である。FIG. 3 shows another example of the present invention. Instead of the reinforcing layers 9A and 9B having the reinforcing cords made of the aromatic polyamide fiber, reinforcing cords made of steel cords are inclined with respect to the tire circumferential direction. 10A of reinforcing layers arranged in parallel with each other, and one layer of reinforcing layer 1 in which reinforcing cords made of aromatic polyamide fiber are arranged so as to be inclined with respect to the tire circumferential direction.
0B and 0B are arranged so that the reinforcing cords intersect with each other.

【００２５】スチールコードからなる補強コードを配列
した補強層１０Ａがタイヤ内側となり、その外側に芳香
族ポリアミド繊維からなる補強コードを配列した補強層
１０Ｂを配置した構成になっている。その外側の補強層
１０Ｂの外周端１０b1は、内側のスチールコードを配し
た補強層１０Ａの外周端１０a1を越えてタイヤ外径側に
延在し、補強層１０Ａ，１０Ｂの外周端１０a1，１０b1
の位置をずれるようにしている。補強層１０Ａ，１０Ｂ
の内周端１０a2，１０b2は、内側の補強層１０Ａの内周
端１０a2の方がタイヤ内径側に位置し、端末をずれるよ
うにしている。The reinforcing layer 10A in which the reinforcing cords made of steel cords are arranged is on the inside of the tire, and the reinforcing layer 10B in which the reinforcing cords made of aromatic polyamide fibers are arranged is arranged outside the tire. The outer peripheral end 10b 1 of the outer reinforcing layer 10B extends beyond the outer peripheral end 10a 1 of the inner steel cord-arranged reinforcing layer 10A 1 toward the tire outer diameter side, and the outer peripheral ends 10a 1 of the reinforcing layers 10A and 10B. , 10b 1
The position of is shifted. Reinforcing layers 10A, 10B
The inner peripheral edge 10a 2, 10b 2 of the direction of the inner peripheral edge 10a 2 of the inner reinforcing layer 10A is so positioned in the tire radially inner side, it shifted the terminal.

【００２６】このように補強層をスチールコードからな
る補強コードを配列した補強層１０Ａと芳香族ポリアミ
ド繊維からなる補強コードを配列した補強層１０Ｂとか
ら構成しても、それらをタイヤ外側から内側に巻き下げ
た外側のカーカス層４Ｂの両端部４ｂとタイヤ内側から
外側に巻き上げた内側のカーカス層４Ａの両端部との間
で、しかも、芳香族ポリアミド繊維からなる補強コード
を有する補強層１０Ｂの外周端１０b1をスチールコード
補強層１０Ａの外周端１０a1よりもタイヤ外径側にずら
して配置することにより、スチールコード補強層１０Ａ
の外周端１０a1を外側のカーカス層４Ｂと外側の補強層
１０Ｂの２層で二重に保護するようにしたので、スチー
ルコードの補強コードを配列した補強層１０Ａを共に用
い、それらの補強層１０Ａ，１０Ｂをタイヤ断面高さＨ
の４５％を越えてタイヤ外径側に延在させ、高荷重負荷
走行しても、その外周端が容易にゴムと剥離することが
なく、従来と同等レベルの荷重耐久性を確保することが
できる。Thus, even if the reinforcing layer is composed of the reinforcing layer 10A in which the reinforcing cords made of steel cords are arranged and the reinforcing layer 10B in which the reinforcing cords made of aromatic polyamide fiber are arranged, they are arranged from the tire outer side to the inner side. The outer periphery of the reinforcing layer 10B between the both ends 4b of the rolled-down outer carcass layer 4B and the both ends of the inner carcass layer 4A rolled up from the tire inner side to the outer side, and having a reinforcing cord made of an aromatic polyamide fiber. By arranging the end 10b 1 so as to be shifted to the tire outer diameter side from the outer peripheral end 10a 1 of the steel cord reinforcing layer 10A, the steel cord reinforcing layer 10A
Since the outer peripheral end 10a 1 and to two layers of the outer carcass layer 4B and the outer reinforcing layer 10B protects a double, using both the reinforcing layer 10A having an array of reinforcing cords of the steel cord, their reinforcing layer 10A and 10B are tire cross-section height H
The outer peripheral edge of the tire does not easily peel off from the rubber even when running under a high load, and the same level of load durability as the conventional one can be secured. it can.

【００２７】また、両補強層１０Ａ，１０Ｂをその補強
コードが交差するように設け、その両補強層１０Ａ，１
０Ｂの外周端１０a1，１０b1をタイヤ断面高さＨの４５
〜６５％となる位置まで延在させたので、サイドウォー
ル部の曲げ剛性を従来よりも広い範囲にわたって大きく
することができ、操縦安定性を一層改善することができ
る。Further, both reinforcing layers 10A, 10B are provided so that the reinforcing cords cross each other, and both reinforcing layers 10A, 1
The outer peripheral ends 10a 1 and 10b 1 of
Since it has been extended to a position where it is up to 65%, the bending rigidity of the sidewall portion can be increased over a wider range than in the past, and steering stability can be further improved.

【００２８】上記補強層１０Ａの補強コードの傾斜角度
αとしては、タイヤ周方向に対し１０°＜α＜３０°に
することができる。傾斜角度αが１０°以下であると、
曲げ剛性が小さすぎるため、補強効果が低減し、操縦安
定性の改善効果を得ることができない。逆に３０°以上
になると、曲げ剛性が高くなりすぎるため、カーカス層
との剛性差を大きくなり、高荷重負荷走行時にカーカス
コードの切断故障が発生する。補強層１０Ｂの補強コー
ドの傾斜角度θとしては、上述と同様にすることができ
る。The inclination angle α of the reinforcing cord of the reinforcing layer 10A can be 10 ° <α <30 ° with respect to the tire circumferential direction. When the inclination angle α is 10 ° or less,
Since the bending rigidity is too small, the reinforcing effect is reduced and the steering stability improving effect cannot be obtained. On the other hand, when the angle is 30 ° or more, the bending rigidity becomes too high, so that the difference in rigidity with the carcass layer becomes large, and the carcass cord breaks during running under a heavy load. The inclination angle θ of the reinforcing cord of the reinforcing layer 10B can be the same as described above.

【００２９】補強層１０Ｂの内周端１０b2よりもタイヤ
内径側となるスチールコード配列の補強層１０Ａの内周
端１０a2の位置としては、側面視においてビードコア５
の外周端５ａ近傍に位置させるのがよく、また、芳香族
ポリアミド繊維からなる補強コードを有する補強層１０
Ｂの外周端１０b1は、ビードフィラー６の外周端６ａか
らタイヤ外径側に８〜１５mmの範囲に位置させることが
できる。The position of the inner peripheral end 10a 2 of the reinforcing layer 10A of the steel cord array on the tire inner diameter side of the inner peripheral end 10b 2 of the reinforcing layer 10B is the bead core 5 in a side view.
It is preferable that the reinforcing layer 10 is located near the outer peripheral edge 5a, and the reinforcing layer 10 has a reinforcing cord made of an aromatic polyamide fiber.
The outer peripheral edge 10b of the B 1 represents may be positioned from an outer peripheral end 6a of the bead filler 6 to the range of 8~15mm the tire outer diameter side.

【００３０】[0030]

【実施例】実施例１ タイヤサイズを２２５／４５ＺＲ１７（前輪用）、２４
５／４０ＺＲ１７（後輪用）で共通にし、図１に示す構
成の乗用車用空気入りタイヤにおいて、図２のように芳
香族ポリアミド繊維からなる補強コードを有する補強層
を２層配置し、その外周端の位置（高さｈ）をタイヤ断
面高さＨに対して表１のように変えた本発明タイヤ１〜
３とその比較タイヤ１，２、図３のようにスチールコー
ドの補強コードを有する補強層と芳香族ポリアミド繊維
からなる補強コードを有する補強層とを配置し、その外
周端の位置（高さｈ）をタイヤ断面高さＨに対して表１
のように変えた本発明タイヤ４〜６とその比較タイヤ
３，４、及びスチールコードを配列した補強層を１層配
置した従来タイヤとをそれぞれ作製した。なお、芳香族
ポリアミド繊維として、ケブラーを使用した。Examples Example 1 Tire sizes of 225 / 45ZR17 (for front wheels), 24
5 / 40ZR17 (for rear wheels) is common, and in the pneumatic tire for passenger cars having the structure shown in FIG. 1, two layers of reinforcing layers having reinforcing cords made of aromatic polyamide fiber are arranged as shown in FIG. Tires 1 to 1 of the present invention in which the position of the end (height h) is changed with respect to the tire cross-sectional height H as shown in Table 1.
3 and its comparative tires 1 and 2, a reinforcing layer having a reinforcing cord of steel cord and a reinforcing layer having a reinforcing cord made of aromatic polyamide fiber are arranged as shown in FIG. 3, and the position of the outer peripheral end (height h ) Is shown in Table 1 with respect to the tire section height H.
The tires 4 to 6 of the present invention which were changed as described above, the comparative tires 3 and 4, and the conventional tire in which one reinforcing layer in which steel cords were arranged were arranged were prepared. Kevlar was used as the aromatic polyamide fiber.

【００３１】これら各試験タイヤを以下に示す測定条件
により、操縦安定性及び荷重耐久性の評価試験を行った
ところ、表１に示す結果を得た。 操縦安定性 各試験タイヤをリムサイズ１７×７1/2-JJ（前輪）と１
７×８1/2-JJ（後輪）のリムに装着し、２８０HPを越え
る車両に取付け、ドライ時のテストコースにおいて、パ
ネラーによるフィーリングテストを実施し、その結果を
従来タイヤを１００とする指数値で評価した。この値が
大きい程、操縦安定性が優れている。 荷重耐久性Each of these test tires was subjected to an evaluation test of steering stability and load endurance under the following measurement conditions, and the results shown in Table 1 were obtained. Steering stability Each test tire has a rim size of 17 x 71 / 2-JJ (front wheel) and 1
It is mounted on the rim of 7 × 81 / 2-JJ (rear wheel), mounted on a vehicle over 280 HP, and a feeling test is conducted by a paneler on a test course when dry, and the result is an index with the conventional tire as 100. The value was evaluated. The larger this value, the better the steering stability. Load durability

【００３２】２２５／４５ＺＲ１７を代表とし、試験タ
イヤをドラム径１７０７mmのドラム試験機に取り付け、
ＪＩＳ−Ｄ４２３０，ＪＡＴＭＡイヤーブック（１９９
８年度版）を準用し、内圧２００ｋＰａ，荷重６２０ｋ
ｇを常用荷重とし、荷重耐久性試験終了後、荷重を２０
％／5hr 毎ステップアップし、タイヤが破壊するまで試
験を続行した。その結果を従来タイヤを１００とする指
数値で評価した。この値が大きい程、荷重耐久性に優れ
ている。Typing 225 / 45ZR17, the test tire was mounted on a drum tester with a drum diameter of 1707 mm,
JIS-D4230, JATMA Yearbook (199
8th edition), internal pressure 200kPa, load 620k
g is the normal load and the load is 20 after the endurance test.
The test was continued until the tire broke, stepping up every% / 5hr. The result was evaluated by an index value with the conventional tire being 100. The larger this value, the better the load durability.

【００３３】[0033]

【表１】 [Table 1]

【００３４】表１から明らかなように、本発明タイヤ
は、荷重耐久性を従来タイヤと同レベル以上に確保しな
がら、操縦安定性を改善することができるのが判る。上
記指数値は１０５以上であることが好ましい。 実施例２ タイヤサイズを上記と同様にし、図２の補強層の芳香族
ポリアミド繊維（ケブラー）からなる補強コードの傾斜
角度θを表２のように変えた試験タイヤ１〜３と、図３
の補強層のスチールコードの傾斜角度αを表２のように
変えた試験タイヤ４〜６、及び図３の補強層の芳香族ポ
リアミド繊維の傾斜角度θを表２のように変えた試験タ
イヤ７〜９とをそれぞれ作製した。As is clear from Table 1, the tire of the present invention can improve the driving stability while ensuring the load durability to the same level or more as that of the conventional tire. The index value is preferably 105 or more. Example 2 Test tires 1 to 3 in which the tire size was the same as above and the inclination angle θ of the reinforcing cord made of aromatic polyamide fiber (Kevlar) in the reinforcing layer in FIG. 2 was changed as shown in Table 2.
Test tires 4 to 6 in which the inclination angle α of the steel cord of the reinforcing layer is changed as shown in Table 2, and the test tire 7 in which the inclination angle θ of the aromatic polyamide fiber of the reinforcing layer in FIG. 3 is changed as shown in Table 2. 9 to 9 were produced.

【００３５】試験タイヤ１〜３の補強層高さｈは０．５
２Ｈ、試験タイヤ４〜６の補強層高さｈは０．４５Ｈ、
試験タイヤ７〜９の補強層高さｈは０．４８Ｈである。
また、試験タイヤ１〜３は傾斜角度θが逆向きで共に同
じ角度、試験タイヤ４〜６の傾斜角度θは５０°で一
定、試験タイヤ７〜９の傾斜角度αは２０°で一定であ
る。The height h of the reinforcing layers of the test tires 1 to 3 is 0.5.
2H, the reinforcing layer height h of the test tires 4 to 6 is 0.45H,
The reinforcing layer height h of the test tires 7 to 9 is 0.48H.
Further, the test tires 1 to 3 have the same inclination angle θ but the same angle, the test tires 4 to 6 have a constant inclination angle θ of 50 °, and the test tires 7 to 9 have a constant inclination angle α of 20 °. .

【００３６】これら各試験タイヤを上述と同様にして操
縦安定性と荷重耐久性の評価試験を行ったところ、表２
に示す結果を得た。Each of these test tires was subjected to a steering stability and load durability evaluation test in the same manner as described above.
The results shown in are obtained.

【００３７】[0037]

【表２】 [Table 2]

【００３８】表２から、芳香族ポリアミド繊維からなる
補強コードを配列した２層の補強層を用いた本発明タイ
ヤにおいて、該補強層の補強コードの傾斜角度θをタイ
ヤ周方向に対し４０°＜θ＜６５°にするのがよいこと
が判る。From Table 2, in the tire of the present invention using two reinforcing layers in which reinforcing cords made of aromatic polyamide fiber are arranged, the inclination angle θ of the reinforcing cords of the reinforcing layer is 40 ° <with respect to the tire circumferential direction. It can be seen that it is better to set θ <65 °.

【００３９】また、スチールコードからなる補強コード
を配列した補強層と芳香族ポリアミド繊維からなる補強
コードを配列した補強層を用いた本発明タイヤにおい
て、スチールコード補強層の補強コードの傾斜角度αを
タイヤ周方向に対し１０°＜α＜３０°、芳香族ポリア
ミド繊維補強層の補強コードの傾斜角度θをタイヤ周方
向に対し４０°＜θ＜６５°にするのがよいことが判
る。 実施例３Further, in the tire of the present invention using the reinforcing layer in which the reinforcing cords made of steel cord are arranged and the reinforcing layer in which the reinforcing cords made of aromatic polyamide fiber are arranged, the inclination angle α of the reinforcing cords of the steel cord reinforcing layer is It is understood that 10 ° <α <30 ° with respect to the tire circumferential direction, and the inclination angle θ of the reinforcing cord of the aromatic polyamide fiber reinforcing layer is preferably 40 ° <θ <65 ° with respect to the tire circumferential direction. Example 3

【００４０】タイヤサイズを上記と同様にし、図１に示
す構成の乗用車用空気入りタイヤにおいて、図２のよう
に芳香族ポリアミド繊維からなる補強コードを有する補
強層を２層配置した本発明タイヤ７と、カーカス層両端
部を共にタイヤ内側から外側に巻き上げ、その両端部間
に本発明タイヤ７と同じ補強層を配置した比較タイヤ５
とをそれぞれ作製した。The tire size of the tire is the same as that described above, and in the pneumatic tire for passenger cars having the construction shown in FIG. 1, the tire 7 of the present invention in which two layers of reinforcing layers having reinforcing cords made of aromatic polyamide fiber are arranged as shown in FIG. And a comparative tire 5 in which both ends of the carcass layer are rolled up from the inside of the tire to the outside, and the same reinforcing layer as the tire 7 of the present invention is arranged between the ends.
And were produced respectively.

【００４１】これら各試験タイヤを上記と同様にして荷
重耐久性の評価試験を行ったところ、表３に示す結果を
得た。なお、表３では、比較タイヤ５を１００とする指
数値で評価した。この値が大きい程、荷重耐久性が優れ
ている。When each of these test tires was subjected to a load durability evaluation test in the same manner as above, the results shown in Table 3 were obtained. In addition, in Table 3, the comparative tire 5 was evaluated with an index value of 100. The larger this value, the better the load durability.

【００４２】[0042]

【表３】 [Table 3]

【００４３】表３から、内周側のカーカス層両端部をビ
ードコアの周りにタイヤ内側から外側に巻き上げる一
方、外周側のカーカス層両端部を内周側のカーカス層両
端部の外側でビードコアの周りにタイヤ外側から内側に
巻き下げた本発明タイヤは、カーカス層両端部を共にタ
イヤ内側から外側に巻き上げたものよりも荷重耐久性が
大幅に優れていることが判る。From Table 3, both ends of the inner carcass layer are wound around the bead core from the inside of the tire to the outside, while both ends of the outer carcass layer are wrapped around the bead core outside the both ends of the inner carcass layer. It can be seen that the tire of the present invention in which the tire of the present invention is wound from the outside to the inside is significantly superior in load durability to the tire in which both ends of the carcass layer are wound from the inside of the tire to the outside.

【００４４】[0044]

【発明の効果】上述したように本発明は、ビードコアを
埋設した左右のビード部間に２層のカーカス層を配置し
た乗用車用空気入りタイヤにおいて、内周側のカーカス
層両端部を前記ビードコアの周りにタイヤ内側から外側
に巻き上げる一方、外周側のカーカス層両端部を前記内
周側のカーカス層両端部の外側にして前記ビードコアの
周りにタイヤ外側から内側に巻き下げ、前記内周側及び
外周側のカーカス層両端部の間に芳香族ポリアミド繊維
からなる補強コードをタイヤ周方向に対し傾斜して配列
した２層の補強層を、その補強コードが交差するように
設けると共に、それら補強層の外周端及び内周端をずら
して配置し、かつその外周端をタイヤ断面高さＨの４５
〜６５％となる位置まで延在させる、或いは、上記２層
の補強層に代えて、スチールコードからなる補強コード
をタイヤ周方向に対し傾斜して配列した１層の補強層と
その外側の芳香族ポリアミド繊維からなる補強コードを
タイヤ周方向に対し傾斜して配列した１層の補強層と
を、その補強コードが交差するように設けると共に、芳
香族ポリアミド繊維からなる補強コードを有する補強層
の外周端をスチールコードからなる補強コードを有する
補強層のそれよりもタイヤ外径側となるようにずらして
配置することにより、荷重耐久性を従来レベル以上に維
持しながら操縦安定性を一層高めることができる。As described above, according to the present invention, in a pneumatic tire for a passenger vehicle in which two carcass layers are arranged between the right and left bead portions in which the bead cores are embedded, both end portions of the carcass layer on the inner peripheral side are formed of the bead cores. While rolling up from the tire inner side to the outer side, the outer peripheral side carcass layer both ends are outside the inner peripheral side carcass layer both ends and are wound from the tire outer side to the inner side around the bead core, the inner peripheral side and the outer peripheral side. Between the both ends of the side carcass layer, two reinforcing layers in which reinforcing cords made of aromatic polyamide fiber are arranged to be inclined with respect to the tire circumferential direction are provided so that the reinforcing cords cross each other, and The outer peripheral edge and the inner peripheral edge are arranged so as to be offset from each other, and the outer peripheral edge of the tire cross-section height H
Up to a position of 65%, or instead of the above-mentioned two reinforcing layers, one reinforcing layer in which reinforcing cords made of steel cord are arranged to be inclined with respect to the tire circumferential direction and the fragrance outside thereof A reinforcing layer having a reinforcing cord made of an aromatic polyamide fiber and a reinforcing layer of one layer in which the reinforcing cord made of a group polyamide fiber is arranged so as to be inclined with respect to the tire circumferential direction; By arranging the outer peripheral edge so that it is closer to the tire outer diameter side than that of the reinforcing layer having a reinforcing cord made of steel cord, it is possible to further improve steering stability while maintaining load durability above the conventional level. You can

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

【図１】本発明の乗用車用空気入りタイヤの一例を示す
タイヤ子午線断面説明図である。FIG. 1 is a tire meridian section explanatory view showing an example of a pneumatic tire for passenger cars of the present invention.

【図２】図１の要部断面説明図である。FIG. 2 is a cross-sectional explanatory view of a main part of FIG.

【図３】本発明の乗用車用空気入りタイヤに用いられる
補強層の他の例を示す断面説明図である。FIG. 3 is a cross-sectional explanatory view showing another example of the reinforcing layer used in the pneumatic tire for passenger cars of the present invention.

【符号の説明】[Explanation of symbols]

２ ビード部 ４Ａ，４Ｂ カーカ
ス層 ４ａ，４ｂ 端部 ４a' エッジ ５ ビードコア ５ａ 外周端 ６ ビードフィラー ６ａ 外周端 ９Ａ，９Ｂ，１０Ａ，１０Ｂ 補強層 ９a1，９b1，１０a1，１０b1 外周端 ９a2，９b2，１０a2，１０b2 内周端2 bead portions 4A, 4B carcass layer 4a, 4b end 4a 'edge 5 bead core 5a outer peripheral edge 6 bead filler 6a outer peripheral end 9A, 9B, 10A, 10B reinforcing layer 9a 1, 9b 1, 10a 1 , 10b 1 outer peripheral edge 9a 2 , 9b 2 , 10a 2 , 10b 2 inner peripheral edge

Claims (9)

【特許請求の範囲】[Claims] 【請求項１】 ビードコアを埋設した左右のビード部間
に２層のカーカス層を配置した乗用車用空気入りタイヤ
において、 内周側のカーカス層両端部を前記ビードコアの周りにタ
イヤ内側から外側に巻き上げる一方、外周側のカーカス
層両端部を前記内周側のカーカス層両端部の外側にして
前記ビードコアの周りにタイヤ外側から内側に巻き下
げ、前記内周側及び外周側のカーカス層両端部の間に芳
香族ポリアミド繊維からなる補強コードをタイヤ周方向
に対し傾斜して配列した２層の補強層を、その補強コー
ドが交差するように設けると共に、それら補強層の外周
端及び内周端をそれぞれずらして配置し、かつその外周
端をタイヤ断面高さＨの４５〜６５％となる位置まで延
在させた乗用車用空気入りタイヤ。1. A pneumatic tire for a passenger vehicle in which two carcass layers are arranged between left and right bead portions in which bead cores are embedded, and both end portions of the carcass layer on the inner peripheral side are wound around the bead cores from inside to outside of the tire. On the other hand, the both ends of the carcass layer on the outer peripheral side are wound around the bead core from the tire outer side to the inner side with both ends of the carcass layer on the inner peripheral side being between the both ends of the carcass layer on the inner peripheral side and the outer peripheral side. In addition, two reinforcing layers in which reinforcing cords made of aromatic polyamide fiber are arranged to be inclined with respect to the tire circumferential direction are provided so that the reinforcing cords intersect, and the outer peripheral edge and the inner peripheral edge of the reinforcing layers are respectively formed. A pneumatic tire for a passenger vehicle, which is arranged in a staggered manner and whose outer peripheral edge is extended to a position that is 45 to 65% of the tire cross-sectional height H. 【請求項２】 前記補強層の補強コードの傾斜角度θを
タイヤ周方向に対し４０°＜θ＜６５°にした請求項１
記載の乗用車用空気入りタイヤ。2. The inclination angle θ of the reinforcing cord of the reinforcing layer is set to 40 ° <θ <65 ° with respect to the tire circumferential direction.
Pneumatic tires for passenger cars as described. 【請求項３】 内側の補強層の外周端を外側の補強層の
それよりもタイヤ外径側に位置させる一方、外側の補強
層の内周端を内側の補強層のそれよりもタイヤ内径側に
位置させた請求項１または２記載の乗用車用空気入りタ
イヤ。3. The outer peripheral end of the inner reinforcing layer is located closer to the tire outer diameter side than that of the outer reinforcing layer, while the inner peripheral end of the outer reinforcing layer is closer to the tire inner diameter side than that of the inner reinforcing layer. The pneumatic tire for a passenger vehicle according to claim 1 or 2, which is located at. 【請求項４】 前記外側の補強層の内周端を前記ビード
コアの外周端近傍に位置させる一方、前記内側の補強層
の外周端を前記ビードコアの外周に設けられたビードフ
ィラーの外周端からタイヤ外径側に８〜１５mmの範囲に
位置させた請求項１乃至３記載の乗用車用空気入りタイ
ヤ。4. An inner peripheral end of the outer reinforcing layer is located in the vicinity of an outer peripheral end of the bead core, while an outer peripheral end of the inner reinforcing layer is arranged from an outer peripheral end of a bead filler provided on an outer periphery of the bead core. The pneumatic tire for passenger cars according to claim 1, wherein the pneumatic tire for passenger cars is located in a range of 8 to 15 mm on the outer diameter side. 【請求項５】 前記２層の補強層の外周端を共に前記内
周側のカーカス層両端部のエッジよりもタイヤ内径側に
配置した請求項１乃至４記載の乗用車用空気入りタイ
ヤ。5. The pneumatic tire for passenger cars according to claim 1, wherein both outer peripheral ends of the two reinforcing layers are arranged on the tire inner diameter side with respect to edges of both ends of the carcass layer on the inner peripheral side. 【請求項６】 ビードコアを埋設した左右のビード部間
に２層のカーカス層を配置した乗用車用空気入りタイヤ
において、 内周側のカーカス層両端部を前記ビードコアの周りにタ
イヤ内側から外側に巻き上げる一方、外周側のカーカス
層両端部を前記内周側のカーカス層両端部の外側にして
前記ビードコアの周りにタイヤ外側から内側に巻き下
げ、前記内周側及び外周側のカーカス層両端部の間にス
チールコードからなる補強コードをタイヤ周方向に対し
傾斜して配列した１層の補強層とその外側の芳香族ポリ
アミド繊維からなる補強コードをタイヤ周方向に対し傾
斜して配列した１層の補強層とを、その補強コードが交
差するように設け、それら補強層の外周端及び内周端を
それぞれずらして配置すると共に、芳香族ポリアミド繊
維からなる補強コードを有する補強層の外周端をスチー
ルコードからなる補強コードを有する補強層のそれより
もタイヤ外径側となるように配置し、その両補強層の外
周端をタイヤ断面高さＨの４５〜６５％となる位置まで
延在させた乗用車用空気入りタイヤ。6. A pneumatic tire for a passenger vehicle in which two carcass layers are arranged between left and right bead portions in which bead cores are embedded, and both end portions of the carcass layer on the inner peripheral side are wound around the bead cores from inside to outside of the tire. On the other hand, the both ends of the carcass layer on the outer peripheral side are wound around the bead core from the tire outer side to the inner side with both ends of the carcass layer on the inner peripheral side being between the both ends of the carcass layer on the inner peripheral side and the outer peripheral side. A reinforcing layer made of steel cords arranged at an angle with respect to the tire circumferential direction and a reinforcing layer made of aromatic polyamide fibers on the outer side of the reinforcing layer arranged at an angle with respect to the tire circumferential direction The reinforcing cords are provided so as to intersect with each other, the outer peripheral ends and the inner peripheral ends of the reinforcing layers are displaced from each other, and the layers are made of aromatic polyamide fibers. The outer peripheral ends of the reinforcing layer having the reinforcing cords are arranged so as to be closer to the tire outer diameter side than that of the reinforcing layer having the reinforcing cords made of steel cords, and the outer peripheral ends of the both reinforcing layers are arranged to have a tire cross-section height H of 45. A pneumatic tire for passenger cars that has been extended to a position of ~ 65%. 【請求項７】 前記芳香族ポリアミド繊維からなる補強
コードを有する補強層の補強コードの傾斜角度θをタイ
ヤ周方向に対し４０°＜θ＜６５°、スチールコードか
らなる補強コードを有する補強層の補強コードの傾斜角
度αをタイヤ周方向に対し１０°＜α＜３０°にした請
求項６記載の乗用車用空気入りタイヤ。7. A reinforcing layer having a reinforcing cord made of an aromatic polyamide fiber, wherein the inclination angle θ of the reinforcing cord having a reinforcing cord made of an aromatic polyamide fiber is 40 ° <θ <65 ° with respect to the tire circumferential direction. The pneumatic tire for passenger cars according to claim 6, wherein the inclination angle α of the reinforcing cord is 10 ° <α <30 ° with respect to the tire circumferential direction. 【請求項８】 前記スチールコードからなる補強コード
を有する補強層の内周端を前記ビードコアの外周端近傍
に位置させる一方、前記芳香族ポリアミド繊維からなる
補強コードを有する補強層の外周端を前記ビードコアの
外周に設けられたビードフィラーの外周端からタイヤ外
径側に８〜１５mmの範囲に位置させた請求項６または７
記載の乗用車用空気入りタイヤ。8. An inner peripheral end of a reinforcing layer having a reinforcing cord made of the steel cord is located in the vicinity of an outer peripheral end of the bead core, while an outer peripheral end of a reinforcing layer having a reinforcing cord made of the aromatic polyamide fiber is positioned on the outer peripheral end. The bead filler provided on the outer periphery of the bead core is located within a range of 8 to 15 mm from the outer peripheral end of the bead filler toward the tire outer diameter side.
Pneumatic tires for passenger cars as described. 【請求項９】 前記２層の補強層の外周端を共に前記内
周側のカーカス層両端部のエッジよりもタイヤ内径側に
配置した請求項６乃至８記載の乗用車用空気入りタイ
ヤ。9. The pneumatic tire for a passenger vehicle according to claim 6, wherein both outer peripheral ends of the two reinforcing layers are arranged on the tire inner diameter side with respect to edges of both ends of the carcass layer on the inner peripheral side.
JP23757798A 1998-08-24 1998-08-24 Pneumatic tires for passenger cars Expired - Fee Related JP3884866B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23757798A JP3884866B2 (en) 1998-08-24 1998-08-24 Pneumatic tires for passenger cars

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23757798A JP3884866B2 (en) 1998-08-24 1998-08-24 Pneumatic tires for passenger cars

Publications (2)

Publication Number Publication Date
JP2000062416A true JP2000062416A (en) 2000-02-29
JP3884866B2 JP3884866B2 (en) 2007-02-21

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ID=17017388

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Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184205A2 (en) * 2000-08-28 2002-03-06 Dunlop GmbH Pneumatic tire
US7320350B2 (en) * 2005-07-08 2008-01-22 Bridgestone Firestone North American Tire, Llc Sidewall reinforcing layer for pneumatic tires
JP2012501277A (en) * 2008-09-02 2012-01-19 ソシエテ ド テクノロジー ミシュラン Heavy vehicle tire with at least two additional layers in the bead
JP2016113144A (en) * 2014-12-12 2016-06-23 ザ・グッドイヤー・タイヤ・アンド・ラバー・カンパニーＴｈｅ Ｇｏｏｄｙｅａｒ Ｔｉｒｅ ＆ Ｒｕｂｂｅｒ Ｃｏｍｐａｎｙ Aircraft tire
US10549583B2 (en) * 2016-04-12 2020-02-04 Hankook Tire Co., Ltd. Tubeless tire having reinforced bead portion
US11383560B2 (en) 2014-08-06 2022-07-12 Sumitomo Rubber Industries, Ltd. Tire for two-wheeled automotive vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3053926B1 (en) * 2016-07-12 2018-07-13 Michelin & Cie PNEUMATIC COMPRISING A CARCASE REINFORCEMENT CONSISTING OF TWO LAYERS

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184205A2 (en) * 2000-08-28 2002-03-06 Dunlop GmbH Pneumatic tire
EP1184205A3 (en) * 2000-08-28 2002-05-29 Dunlop GmbH Pneumatic tire
US7320350B2 (en) * 2005-07-08 2008-01-22 Bridgestone Firestone North American Tire, Llc Sidewall reinforcing layer for pneumatic tires
JP2012501277A (en) * 2008-09-02 2012-01-19 ソシエテ ド テクノロジー ミシュラン Heavy vehicle tire with at least two additional layers in the bead
US8720515B2 (en) 2008-09-02 2014-05-13 Michelin Recherche Et Technique S.A. Tire for heavy vehicles comprising at least two additional layers in the beads
US11383560B2 (en) 2014-08-06 2022-07-12 Sumitomo Rubber Industries, Ltd. Tire for two-wheeled automotive vehicle
JP2016113144A (en) * 2014-12-12 2016-06-23 ザ・グッドイヤー・タイヤ・アンド・ラバー・カンパニーＴｈｅ Ｇｏｏｄｙｅａｒ Ｔｉｒｅ ＆ Ｒｕｂｂｅｒ Ｃｏｍｐａｎｙ Aircraft tire
US10549583B2 (en) * 2016-04-12 2020-02-04 Hankook Tire Co., Ltd. Tubeless tire having reinforced bead portion

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