JP3079437B2 - Radial tire - Google Patents
Radial tireInfo
- Publication number
- JP3079437B2 JP3079437B2 JP03037427A JP3742791A JP3079437B2 JP 3079437 B2 JP3079437 B2 JP 3079437B2 JP 03037427 A JP03037427 A JP 03037427A JP 3742791 A JP3742791 A JP 3742791A JP 3079437 B2 JP3079437 B2 JP 3079437B2
- Authority
- JP
- Japan
- Prior art keywords
- tire
- organic fiber
- ply
- reinforcing ply
- circumferential direction
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/02—Carcasses
- B60C9/12—Carcasses built-up with rubberised layers of discrete fibres or filaments
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、従来のタイヤに比べて
サイドウォール部の周方向剛性を大きくしたラジアルタ
イヤに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radial tire having a sidewall portion having a greater rigidity in a circumferential direction than a conventional tire.
【０００２】[0002]
【従来の技術と発明が解決しようとする課題】ラジアル
タイヤは、カーカスのコードがタイヤの子午線方向をな
し、サイド部ではラジアル方向を向いている構造上、一
般にタイヤ周方向の剛性が低いものとなっている。2. Description of the Related Art Radial tires generally have low rigidity in the tire circumferential direction due to the structure in which the cord of the carcass is in the meridian direction of the tire and is directed in the radial direction at the side portions. Has become.
【０００３】一方、このタイヤを装着した車両が凹凸の
ある路面を走行するときに身体に感じるショックや車内
のこもり音（ロードノイズ）は、車両の快適性にとって
重要な課題である。これらの現象に関係したタイヤの振
動は、主にねじりモードであることが知られている。こ
の現象を改善するための方策の一つとして、タイヤのね
じり剛性を上げること、そのためにタイヤ周方向の剛
性、特にサイドウォール部の周方向剛性を大きくするこ
とである。[0003] On the other hand, when a vehicle equipped with the tires travels on a bumpy road surface, shocks and a muffled sound (road noise) felt on the body are important issues for the comfort of the vehicle. It is known that the vibration of the tire related to these phenomena is mainly in a torsional mode. One of the measures to improve this phenomenon is to increase the torsional rigidity of the tire, and to increase the rigidity in the tire circumferential direction, in particular, the circumferential rigidity of the sidewall portion.
【０００４】サイドウォール部の剛性を大きくする方法
としては、タイヤ形状の変更、あるいはサイドウォール
部に補強プライを追加する方法が考えられる。[0004] As a method of increasing the rigidity of the sidewall portion, a method of changing the tire shape or adding a reinforcing ply to the sidewall portion can be considered.
【０００５】しかしながら、これらの方策では、サイド
ウォール部におけるタイヤ周方向の剛性だけを独立に変
化させことは不可能であり、ラジアル方向や横方向の剛
性も同時に変化してしまい、操縦安定性、乗り心地等の
他の性能も変化してしまう欠点があった。However, with these measures, it is impossible to independently change only the rigidity of the sidewall portion in the tire circumferential direction, and the radial and lateral rigidities also change at the same time. There is a disadvantage that other performances such as ride comfort are also changed.
【０００６】本発明は上記に鑑みてなしたものであっ
て、従来のタイヤに比べて、タイヤのラジアル方向およ
び横方向の変化を最小限に抑え、タイヤ周方向の剛性、
特にサイドウォール部での周方向剛性だけを大きくした
ラジアルタイヤを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and minimizes changes in the radial and lateral directions of a tire and reduces rigidity in the tire circumferential direction as compared with conventional tires.
In particular, it is an object of the present invention to provide a radial tire in which only the rigidity in the circumferential direction at the sidewall portion is increased.
【０００７】[0007]
【課題を解決するための手段】本発明のラジアルタイヤ
は、上記の課題を解決するために、タイヤのベルト端下
部からサイドウォール部に渡って平行に引き揃えられた
有機繊維のコードを含む補強プライを、前記コードがタ
イヤ周方向に対して０〜１０゜の角度方向をなすように
配してなることを特徴とする。Radial tire of the present invention, in order to solve the problems] To solve the above problem, under the belt end of the tire
A reinforcing ply containing organic fiber cord aligned drawn parallel over the sidewall portion from the part, that the code is formed by arranging so as to form an 0 ° angle direction with respect to the tire circumferential direction Features.
【０００８】[0008]
【作用】平行に引き揃えられた有機繊維コードを含む補
強プライは、前記コードと平行方向の弾性定数は大きく
なるが、前記コードと直交する幅方向および厚み方向の
弾性定数は殆ど変化しない。そのため、有機繊維コード
がタイヤ周方向に対して０〜１０°の角度方向をなすよ
うに前記の補強プライをサイドウォール部に配した本発
明のラジアルタイヤは、サイドウォール部におけるタイ
ヤ周方向の弾性定数が、補強プライを有さないタイヤに
比して大きくなり、しかもタイヤの横方向や厚み方向の
弾性定数は殆ど変化しないことになる。The reinforcing ply including the organic fiber cords arranged in parallel has a large elastic constant in the direction parallel to the cord, but the elastic constants in the width direction and the thickness direction perpendicular to the cord hardly change. Therefore, the radial tire of the present invention, in which the reinforcing ply is disposed on the sidewall portion so that the organic fiber cord forms an angle direction of 0 to 10 ° with respect to the tire circumferential direction, has an elasticity in the tire circumferential direction at the sidewall portion. The constant is larger than that of the tire having no reinforcing ply, and the elastic constant in the lateral direction and the thickness direction of the tire hardly changes.
【０００９】したがって、タイヤのラジアル方向および
横方向のタイヤ剛性の変化を最小限に抑えた状態で、サ
イドウォール部でのタイヤ周方向の剛性、つまりねじり
剛性を高めることができる。Therefore, the rigidity of the tire in the tire circumferential direction, that is, the torsional rigidity at the sidewall portion can be increased while minimizing changes in the tire rigidity in the radial and lateral directions of the tire.
【００１０】前記補強プライの有機繊維コードのタイヤ
周方向に対してなす角度が１０°を越えると、周方向剛
性の増大の効果が小さくなるばかりでなく、ラジアル方
向の剛性も増大することになるので、タイヤ周方向に対
して１０°以内とするのがよく、できるだけ０°に近い
ほうが好ましい。When the angle between the reinforcing ply and the organic fiber cord with respect to the tire circumferential direction exceeds 10 °, not only the effect of increasing the circumferential rigidity is reduced, but also the radial rigidity is increased. Therefore, it is preferable that the angle be within 10 ° with respect to the tire circumferential direction, and it is preferable that the angle be as close to 0 ° as possible.
【００１１】[0011]
【実施例】図１は本発明の実施例に係るラジアルタイヤ
（Ｔ）の半断面図を示し、図２はカーカスプライ、ベル
トプライおよび補強プライの展開平面図を示している。FIG. 1 is a half sectional view of a radial tire (T) according to an embodiment of the present invention, and FIG. 2 is a developed plan view of a carcass ply, a belt ply and a reinforcing ply.
【００１２】カーカスプライ（１）はタイヤ（Ｔ）のト
レッド部（２）からサイドウォール部（３）を経てビー
ド部（４）のビードコア（４ａ）を巻込むように折返さ
れて両端が係止される。トレッド部（２）にはカーカス
プライ（１）の外側にスチールコードを含む数層のベル
トプライ（５）が配設されている。このベルトプライ
（５）のスチールコードはタイヤ周方向に若干の角度を
持っており、カーカスプライ外周を拘束する。The carcass ply (1) is folded back from the tread portion (2) of the tire (T) through the sidewall portion (3) so as to wind the bead core (4a) of the bead portion (4), and both ends are locked. Is done. The tread portion (2) is provided with several layers of belt plies (5) including a steel cord outside the carcass plies (1). The steel cord of the belt ply (5) has a slight angle in the tire circumferential direction, and restrains the outer periphery of the carcass ply.
【００１３】タイヤのサイドウォール部（３）のカーカ
スプライ（１）の外側には、平行に引き揃えられた多数
本の有機繊維コード（７ａ）を含む補強プライ（７）が
埋設されており、特にこの補強プライ（７）中の前記有
機繊維コード（７ａ）はタイヤ周方向に対して０〜１０
°の角度方向をなしている。Outside the carcass ply (1) of the sidewall portion (3) of the tire, a reinforcing ply (7) containing a large number of organic fiber cords (7a) aligned in parallel is embedded. In particular, the organic fiber cord (7a) in the reinforcing ply (7) is 0 to 10 with respect to the tire circumferential direction.
° angle direction.
【００１４】この補強プライ（７）は、ベルト端（５
ａ）の下部からビード部（４）の外側位置に渡る範囲内
に任意の幅で設けることができるが、ビード端（５ａ）
と補強プライ（７）との間に大きな間隔が存すると、こ
の部分で周方向剛性の増大の効果が小さくなるので、図
のようにベルト端（５ａ）の下部からサイドウォール部
（３）に渡って設けるのがよく、特にその効果上、ベル
ト端（５ａ）の下部からビード部（４）外側のできるだ
け広い範囲に設けるのが望ましい。また必要に応じて、
この補強プライ（７）を複数層とすることができる。The reinforcing ply (7) is connected to the belt end (5).
Although it can be provided with an arbitrary width within a range extending from the lower portion of a) to the position outside the bead portion (4), the bead end (5a)
If there is a large gap between the ply and the reinforcing ply (7), the effect of increasing the circumferential rigidity is reduced at this portion, and as shown in FIG. It is preferable to provide it over the belt, and particularly, from the viewpoint of its effect, it is desirable to provide it as wide as possible from the lower part of the belt end (5a) to the outside of the bead part (4). Also, if necessary,
The reinforcing ply (7) can be composed of a plurality of layers.
【００１５】前記の補強プライ（７）は、ナイロン、ポ
リエステル、アラミド、ビニロン等の有機繊維の糸条、
つまり有機繊維コード（７ａ）を主材とし、これを平行
に引き揃えてゴム（７ｂ）により被覆したものである
（図３）。この有機繊維コード（７ａ）の径や本数およ
び補強プライ（７）の厚み等は、対象となるタイヤサイ
ズ等に応じて適宜設定される。The reinforcing ply (7) is made of a yarn of an organic fiber such as nylon, polyester, aramid, and vinylon;
That is, the organic fiber cord (7a) is used as a main material, which is aligned in parallel and covered with the rubber (7b) (FIG. 3). The diameter and number of the organic fiber cords (7a), the thickness of the reinforcing ply (7), and the like are appropriately set according to the target tire size and the like.
【００１６】この補強プライ（７）は、タイヤ製造過程
における成型工程でカーカスプライ（１）の外側に貼付
されて、前記の角度をなすようにサイドウォール部
（３）に埋設されるが、特に成型工程での補強プライ
（７）の貼付時と、成型用ブラダーへの空気充填による
膨脹時とにおいて生じる半径差を考慮して、補強プライ
貼付時のジョイント用の重ね代（Ｗ）を、図４に示すよ
うに、ビード部（４）側の端部で最小とし、ベルト端
（５ａ）の下部側に向って漸次に大きくなるように工夫
しておくのがよい。The reinforcing ply (7) is affixed to the outside of the carcass ply (1) in a molding step in the tire manufacturing process, and is buried in the side wall portion (3) at the above-mentioned angle. The overlap margin (W) for the joint at the time of attaching the reinforcing ply is shown in consideration of the difference in radius between the time of attaching the reinforcing ply (7) in the molding process and the time of inflation due to the filling of the molding bladder with air. As shown in FIG. 4, it is preferable that the distance be minimized at the end on the bead portion (4) side and be gradually increased toward the lower side of the belt end (5a).
【００１７】しかして、有機繊維コード（７ａ）とゴム
（７ｂ）との複合材よりなる上記の補強プライ（７）の
材料特性については、複合材の理論によると、有機繊維
コード（７ａ）の軸方向の弾性定数（ＥL)と、有機繊維
コード（７ａ）と直交する幅方向および厚み方向の弾性
定数（Ｅt)とは下記により求められる。According to the theory of the composite material, the material characteristics of the reinforcing ply (7) made of the composite material of the organic fiber cord (7a) and the rubber (7b) are as follows. The elastic constant (E L) in the axial direction and the elastic constant (E t) in the width direction and the thickness direction orthogonal to the organic fiber cord (7a) are obtained as follows.
【００１８】[0018]
【数１】 (Equation 1)
【００１９】ここで、Ｅf ：有機繊維コードのヤング率 Ｅm ：ゴムのヤング率 Ｖf ：有機繊維コードの体積比 Ｖm ：ゴムの体積比。Here, Ef: Young's modulus of organic fiber cord Em: Young's modulus of rubber Vf: Volume ratio of organic fiber cord Vm: Volume ratio of rubber
【００２０】例えば、図３に示す構造の複合材で、厚み
０．８２mm、有機繊維コードの径が０．４７６mm、コー
ド数が２２．９本／inch、Ｅf が２２０ kgf／mm2 、Ｖ
m が０．２７ kgf／mm2 のものについて計算すると、上
の数１の式から ＥL ＝４４．２ kgf／mm2 Ｅt ＝０．３４ kgf／mm2 のようになる。For example, the composite material shown in FIG. 3 has a thickness of 0.82 mm, an organic fiber cord diameter of 0.476 mm, the number of cords is 22.9 cords / inch, Ef is 220 kgf / mm 2 , V
When m is calculated to be 0.27 kgf / mm 2 , from the above equation (1), it becomes as follows: EL = 44.2 kgf / mm 2 Et = 0.34 kgf / mm 2
【００２１】このように、有機繊維コード（７ａ）の軸
方向の弾性定数はかなり大きくなるが、これと直角の幅
方向および厚み方向の弾性定数はごく僅かなものであ
る。As described above, the elastic constant in the axial direction of the organic fiber cord (7a) is considerably large, but the elastic constants in the width direction and the thickness direction perpendicular thereto are very small.
【００２２】そのため、この複合材よりなる補強プライ
（７）を、有機繊維コード（７ａ）がタイヤ周方向に対
して０°に近い角度方向にしてサイドウォール部（３）
に配することにより、サイドウォール部（３）における
タイヤ周方向の弾性定数が、補強プライを有さないタイ
ヤに比してかなり大きくなるが、タイヤの横方向や厚み
方向の弾性定数は殆ど変化せず、したがって、タイヤの
ラジアル方向および横方向のタイヤ剛性の変化を最小限
に抑えて、サイドウォール部（３）でのタイヤ周方向剛
性、つまりねじり剛性を高めることができるのである。Therefore, the reinforcing ply (7) made of the composite material is set so that the organic fiber cord (7a) is oriented at an angle close to 0 ° with respect to the circumferential direction of the tire, and the sidewall portion (3) is formed.
, The elastic constant in the tire circumferential direction at the sidewall portion (3) is considerably larger than that of the tire having no reinforcing ply, but the elastic constant in the lateral direction and the thickness direction of the tire is almost changed. Therefore, the change in the tire stiffness in the radial and lateral directions of the tire can be minimized, and the tire circumferential stiffness in the sidewall portion (3), that is, the torsional stiffness can be increased.
【００２３】[0023]
【発明の効果】上記したように本発明のラジアルタイヤ
においては、平行に引き揃えられた多数本の有機繊維コ
ードを含む補強プライを、有機繊維コードがタイヤ周方
向に対に対して０〜１０゜の角度方向をなすようにベル
ト端下部からサイドウォール部に渡って配したことによ
り、タイヤのラジアル方向および横方向のタイヤ剛性の
変化を最小限に抑えて、サイドウォール部でのタイヤ周
方向の剛性、すなわちタイヤのねじり剛性を高めること
ができる。したがって、操縦安定性や乗り心地等の他の
性能を変化させずに、走行時に身体に感じシヨックや車
内のこもり音（ロードノイズ）を大幅に緩和できること
になる。As described above, in the radial tire according to the present invention, the reinforcing ply including a large number of organic fiber cords aligned in parallel is provided such that the organic fiber cords are disposed in a circumferential direction of the tire in a range of 0-10. Bell so that it forms the angle direction of ゜
By arranged over the preparative end bottom in the sidewall portion, with minimal changes in the tire rigidity in the radial direction and the transverse direction of the tire, the tire circumferential stiffness of the side wall portion, or twisting of the tire stiffness Can be increased. Therefore, it is possible to greatly reduce a shock and a muffled sound (road noise) felt by the body during traveling without changing other performances such as steering stability and riding comfort.
【図１】本発明の実施例に係るラジアルタイヤの半断面
図である。FIG. 1 is a half sectional view of a radial tire according to an embodiment of the present invention.
【図２】カーカスプライ、ベルトプライおよび補強プラ
イの略示展開平面図である。FIG. 2 is a schematic development plan view of a carcass ply, a belt ply, and a reinforcing ply.
【図３】補強プライに使用する複合材を例示する部分拡
大断面図である。FIG. 3 is a partially enlarged cross-sectional view illustrating a composite material used for a reinforcing ply.
【図４】成型工程での補強プライのジョイント部分を示
す略示図である。FIG. 4 is a schematic view showing a joint portion of a reinforcing ply in a molding step.
（１）……カーカスプライ （３）……サイドウォール部 （４）……ビード部 （４ａ）…ビードコア （５）……ベルトプライ （５ａ）…ベルト端 （７）……補強プライ （７ａ）…有機繊維コード （７ｂ）…ゴム (1) Carcass ply (3) Sidewall part (4) Bead part (4a) Bead core (5) Belt ply (5a) Belt end (7) Reinforcement ply (7a) ... Organic fiber cord (7b) ... Rubber
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−208609（ＪＰ，Ａ) 特開 平３−253406（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B60C 13/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-208609 (JP, A) JP-A-3-253406 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B60C 13/00
Claims (1)
ル部に渡って平行に引き揃えられた有機繊維コードを含
む補強プライを、前記コードがタイヤ周方向に対して０
〜１０゜の角度方向をなすように配してなることを特徴
とするラジアルタイヤ。The method according to claim 1 reinforcing ply containing organic fiber cords aligned drawn parallel over the sidewall portion from the lower portion of the belt end of the tire, the cord with respect to the tire circumferential direction 0
A radial tire characterized by being arranged so as to form an angle direction of 10 to 10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03037427A JP3079437B2 (en) | 1991-03-04 | 1991-03-04 | Radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03037427A JP3079437B2 (en) | 1991-03-04 | 1991-03-04 | Radial tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04278810A JPH04278810A (en) | 1992-10-05 |
| JP3079437B2 true JP3079437B2 (en) | 2000-08-21 |
Family
ID=12497220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03037427A Expired - Lifetime JP3079437B2 (en) | 1991-03-04 | 1991-03-04 | Radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3079437B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3303216B2 (en) * | 1993-01-11 | 2002-07-15 | 東洋ゴム工業株式会社 | Low road noise passenger car tires |
| JP2001191764A (en) * | 2000-01-14 | 2001-07-17 | Bridgestone Corp | Pneumatic tire |
| JP2002059714A (en) * | 2000-08-14 | 2002-02-26 | Bridgestone Corp | Pneumatic tire |
| JP2002059715A (en) * | 2000-08-23 | 2002-02-26 | Bridgestone Corp | Pneumatic radial tire |
| JP4031243B2 (en) | 2001-12-27 | 2008-01-09 | 住友ゴム工業株式会社 | Pneumatic radial tire |
| KR101889339B1 (en) * | 2016-10-26 | 2018-08-17 | 넥센타이어 주식회사 | A pneumatic tire for racing |
| JP7139943B2 (en) * | 2018-12-28 | 2022-09-21 | 住友ゴム工業株式会社 | pneumatic tire |
| JP7388056B2 (en) | 2019-08-29 | 2023-11-29 | 住友ゴム工業株式会社 | pneumatic tires |
-
1991
- 1991-03-04 JP JP03037427A patent/JP3079437B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04278810A (en) | 1992-10-05 |
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