JPH0632121A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH0632121A JPH0632121A JP4190913A JP19091392A JPH0632121A JP H0632121 A JPH0632121 A JP H0632121A JP 4190913 A JP4190913 A JP 4190913A JP 19091392 A JP19091392 A JP 19091392A JP H0632121 A JPH0632121 A JP H0632121A
- Authority
- JP
- Japan
- Prior art keywords
- bead
- tire
- pneumatic tire
- ply
- radial
- 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
Links
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ビード部の耐久性を向
上させた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 having improved bead portion durability.
【０００２】[0002]
【従来の技術】従来、ビード部の耐久性を向上させた空
気入りタイヤとしては、例えば、英国特許１２１０９３
５号明細書に記載されているようなものが知られてい
る。2. Description of the Related Art Conventionally, as a pneumatic tire having improved durability of a bead portion, for example, British Patent 121093 is available.
Those described in the specification of No. 5 are known.
【０００３】図４に示される如く、このような空気入り
タイヤ７０では、ビード７４の軸方向内側にカーカスプ
ライ７６の本体部７８を有するとともに、ビード７４の
軸方向外側にカーカスプライ７６の本体部７８に沿って
延びる外側プライとしてのカーカスプライ７６の折り返
し部８０を有している。As shown in FIG. 4, such a pneumatic tire 70 has a main body 78 of a carcass ply 76 inside the bead 74 in the axial direction and a main body 78 of the carcass ply 76 outside the bead 74 in the axial direction. It has a folded-back portion 80 of a carcass ply 76 as an outer ply extending along 78.
【０００４】このカーカスプライ７６の折り返し部８０
の半径方向外側端８０Ａとタイヤ最大幅位置との間のタ
イヤ外表面には、凹部８２が形成されている。The folded portion 80 of the carcass ply 76
A concave portion 82 is formed on the outer surface of the tire between the outer end 80A in the radial direction and the maximum tire width position.
【０００５】また、図５に示される如く、凹部８２は周
方向に所定の間隔Ｓを開けて複数個形成されている。Further, as shown in FIG. 5, a plurality of recesses 82 are formed at predetermined intervals S in the circumferential direction.
【０００６】ここで、周方向に離れた多数の凹部８２を
用いている理由は次のとおりである。Here, the reason why a large number of recesses 82 spaced apart in the circumferential direction are used is as follows.
【０００７】例えば、図６に示される如く、空気入りタ
イヤ７０に周方向に連続した凹部８３を形成した場合に
は、ビード部の周方向剛性の低減する程度が著しくなっ
て、負荷転動時にタイヤ回転方向の変形が集中し、この
結果、凹部８３の底部にタイヤの周方向に対して斜め方
向のクラック、所謂、ダイアゴナルクラックが発生し、
これが内部へと進展するためにビード部耐久性が低下し
てしまう。For example, as shown in FIG. 6, when the recessed portion 83 which is continuous in the circumferential direction is formed in the pneumatic tire 70, the degree of reduction in the circumferential rigidity of the bead portion becomes remarkable, and when the load rolls. Deformation in the tire rotation direction is concentrated, and as a result, a crack in a direction oblique to the circumferential direction of the tire, a so-called diagonal crack, is generated at the bottom of the recess 83.
Since this progresses to the inside, the durability of the bead portion is reduced.
【０００８】また、周方向に連続した凹部を使用せず、
周方向に離れた多数の凹部を用いる場合には、ビード部
の周方向剛性を使用に充分耐える値まで高めることがで
き、ダイアゴナルクラックの発生を防止できる。Also, without using a continuous recess in the circumferential direction,
When using a large number of recesses that are separated in the circumferential direction, the circumferential rigidity of the bead portion can be increased to a value that can withstand sufficient use, and the occurrence of diagonal cracks can be prevented.
【０００９】しかしながら、図４に示される空気入りタ
イヤ７０においては、図５に示される如く、周方向に沿
って凹部８２が存在する部分９０と存在しない部分９２
とが交互に繰り返されている。このため、凹部８２によ
るビード部耐久性向上の効果が周上で不均一となり、凹
部の無い部分から故障が先に発生する場合があるため、
ビード部耐久性の効果が不充分となる。However, in the pneumatic tire 70 shown in FIG. 4, as shown in FIG. 5, a portion 90 in which the concave portion 82 exists and a portion 92 in which the concave portion 82 does not exist along the circumferential direction.
And are repeated alternately. For this reason, the effect of improving the durability of the bead portion by the concave portion 82 becomes non-uniform on the circumference, and the failure may occur first from the portion without the concave portion.
The effect of bead part durability becomes insufficient.
【００１０】[0010]
【発明が解決しようとする課題】本発明は上記事実を考
慮し、凹部の効果を周方向に沿って均一にして、ビード
部耐久性を向上させることができる空気入りタイヤを提
供することを目的とする。SUMMARY OF THE INVENTION In consideration of the above facts, the present invention aims to provide a pneumatic tire capable of improving the bead portion durability by making the effect of the recesses uniform along the circumferential direction. And
【００１１】[0011]
【課題を解決するための手段】請求項１記載の本発明で
は、ビードの軸方向内側にカーカスプライの本体部を有
すると共にビードの軸方向外側に前記本体部に沿って延
びる外側プライを有し、前記外側プライの半径方向外端
とタイヤ最大幅位置との間のタイヤ外表面に周方向に離
れた多数の凹部が形成された空気入りタイヤにおいて、
隣接する前記凹部が半径方向に対して互いに重複するオ
ーバーラップ部分を有することを特徴としている。According to the present invention, there is provided a carcass ply body on the inner side of the bead in the axial direction and an outer ply extending along the body on the outer side of the bead in the axial direction. A pneumatic tire having a large number of recesses circumferentially separated from each other on a tire outer surface between a radial outer end of the outer ply and a tire maximum width position,
It is characterized in that the adjacent recesses have overlapping portions that overlap each other in the radial direction.
【００１２】[0012]
【作用】一般に、空気入りタイヤは荷重を負荷すると、
該荷重の反力を路面から受けて接地側のサイドウォール
部が撓み、その内部に応力が生じるが、これにより、外
側プライの半径方向外端に大きな圧縮歪みが発生する。[Function] Generally, when a pneumatic tire is loaded with a load,
The ground-side sidewall portion is bent by receiving the reaction force of the load from the road surface, and stress is generated inside the sidewall portion, which causes a large compressive strain at the radial outer end of the outer ply.
【００１３】これに対して外側プライの半径方向外端と
タイヤ最大幅位置との間のタイヤ外表面に凹部を設ける
ことは、外側プライの半径方向外側に生じている内部応
力を遮断し、内部応力の、外側プライの半径方向外端へ
の影響を低減させ圧縮歪を低減することができる。On the other hand, the provision of the recess on the outer surface of the tire between the outer end of the outer ply in the radial direction and the position of the maximum width of the tire blocks the internal stress generated in the outer side of the outer ply in the radial direction, and It is possible to reduce the influence of stress on the radially outer end of the outer ply and reduce the compressive strain.
【００１４】しかしながら凹部がある部位と、凹部が無
い部位とでは、凹部によって低減される負荷転動時の外
側プライの半径方向外端の圧縮歪み量が不均一となっ
て、凹部の無い部分から故障が先に発生する。However, between the portion having the concave portion and the portion having no concave portion, the amount of compressive strain of the outer end of the outer ply in the radial direction at the time of load rolling which is reduced by the concave portion becomes non-uniform, so that from the portion without the concave portion. Failure occurs first.
【００１５】従って、この凹部の弱点を補うことができ
れば、凹部の長所が一層発揮されビード部耐久性が著し
く向上することになる。Therefore, if the weak points of the concave portion can be compensated, the advantages of the concave portion are further exerted and the durability of the bead portion is remarkably improved.
【００１６】これに対して、本発明では隣接する凹部が
半径方向に対して互いに重複するように、凹部にそれぞ
れオーバーラップ部分を設け、凹部によって低減される
負荷転動時の外側プライの半径方向外端の圧縮歪み量を
周方向に沿って均一とし、凹部の無い部分からの故障発
生を防止することで、ビード部耐久性を向上させること
ができる。On the other hand, in the present invention, the recesses are provided with overlapping portions so that the adjacent recesses overlap each other in the radial direction, and the recesses reduce the radial direction of the outer ply during load rolling. It is possible to improve the durability of the bead portion by making the amount of compressive strain of the outer end uniform along the circumferential direction and preventing the occurrence of a failure from a portion having no recess.
【００１７】また、凹部を不連続とし、周上に凹部が無
い部分を設けることによって、凹部の底部でダイヤゴナ
ルクラックが発生しないために必要な周方向剛性を確保
することができる。Further, by disposing the concave portion discontinuously and providing a portion having no concave portion on the circumference, it is possible to secure the circumferential rigidity necessary for preventing the occurrence of a diagonal crack at the bottom portion of the concave portion.
【００１８】[0018]
【実施例】本発明の空気入りタイヤの一実施例を図１及
び図２に従って説明する。EXAMPLE An example of the pneumatic tire of the present invention will be described with reference to FIGS.
【００１９】図２に示される如く、空気入りタイヤ１０
は一対のビード１２と、トロイダル状をしたカーカス層
１４とを有し、このカーカス層１４は、内部にラジアル
方向に延びる多数本のコードが埋設された少なくとも１
枚のカーカスプライ１６から構成されている。As shown in FIG. 2, the pneumatic tire 10
Has a pair of beads 12 and a toroidal carcass layer 14, and the carcass layer 14 has at least one in which a large number of cords extending in the radial direction are embedded.
It is composed of one carcass ply 16.
【００２０】カーカスプライ１６は、一方のビード１２
から他方のビード１２まで延びることにより、ビード１
２の軸方向内側に位置する本体部１８と、ビード１２の
周りを外側に折返されると共に、本体部１８に沿って、
即ち本体部１８にほぼ平行に延びることにより、ビード
１２の軸方向外側に位置する外側プライとしての折り返
し部２０と、から構成されている。The carcass ply 16 has one bead 12
From one bead 12 to another bead 1
Along the body portion 18 and the body portion 18 located on the inner side in the axial direction of 2 and around the bead 12 to the outside,
That is, by extending substantially parallel to the main body portion 18, the folded portion 20 is formed as an outer ply located on the outer side in the axial direction of the bead 12.
【００２１】また、本実施例では、ビード部１０Ａにお
けるカーカスプライ１６の外側に補強プライ１５が配設
されており、この補強プライ１５は折り返し部２０を補
強している。ここで、ビード１２より軸方向外側の補強
プライ１５の半径方向外端１５Ａは、折り返し部２０の
半径方向外端２０Ａより、半径方向内側に位置している
ため、折り返し部２０が前述のように外側プライに該当
することになる。逆に、補強プライ１５の半径方向外端
１５Ａが折り返し部２０の半径方向外端２０Ａより、半
径方向外側に位置している場合には、補強プライ１５が
外側プライに該当することになる。Further, in the present embodiment, the reinforcing ply 15 is arranged outside the carcass ply 16 in the bead portion 10A, and the reinforcing ply 15 reinforces the folded portion 20. Here, since the radial outer end 15A of the reinforcing ply 15 that is axially outside the bead 12 is located radially inward of the radial outer end 20A of the folded portion 20, the folded portion 20 has the same shape as described above. It will correspond to the outer ply. On the contrary, when the radial outer end 15A of the reinforcing ply 15 is located radially outward of the radial outer end 20A of the folded portion 20, the reinforcing ply 15 corresponds to the outer ply.
【００２２】カーカス層１４の半径方向外側には、少な
くとも２枚のベルトプライ２２からなるベルト層２４が
配置され、これらのベルトプライ２２内には、周方向に
対して傾斜した多数本の補強コードが埋設されると共
に、これらの補強コードは隣接するベルトプライ２２に
おいて互いに交差している。A belt layer 24 composed of at least two belt plies 22 is arranged on the outer side of the carcass layer 14 in the radial direction, and a large number of reinforcing cords inclined with respect to the circumferential direction are provided in the belt plies 22. And the reinforcing cords intersect each other in the adjacent belt plies 22.
【００２３】また、ベルト層２４の半径方向外側には、
主溝、横溝等の溝２６が形成されたゴムがトレッド２８
を成し、さらに、カーカス層１４の軸方向両外側にもゴ
ムが配置されてサイドウォール３０を成している。On the outer side in the radial direction of the belt layer 24,
The rubber in which the grooves 26 such as the main groove and the lateral groove are formed is the tread 28.
Further, rubber is also arranged on both outer sides in the axial direction of the carcass layer 14 to form the sidewall 30.
【００２４】なお、リム３１は、空気入りタイヤ１０の
回転軸線に対して傾斜角Ａで傾斜するビードシート部３
１Ａを有しており、このリム３１に空気入りタイヤ１０
が装着されたとき、空気入りタイヤ１０のビード部１０
Ａは、ビードシート部３１Ａにそれぞれ着座される。こ
こで、ビードシート部３１Ａの傾斜角Ａが１５度程度で
あるリム３１は、リムフランジ３１Ｂの高さＨがリムベ
ース径Ｄの０．０２０倍から０．０２９倍までとかなり
低く、ビード部１０Ａとリムフランジ３１Ｂとの間の接
合力だけで空気入りタイヤ１０とリム３１との周方向の
滑りを抑制することは難しいため、このリム３１に装着
される空気入りタイヤ１０は、ビードベース部１０Ｂと
ビードシート部３１Ａとの間で空気入りタイヤ１０とリ
ム３１との接合力を発生させて、空気入りタイヤ１０と
リム３１との滑り及び滑りに基づきビード部故障を防止
するために、ビードベース部１０Ｂの肉厚を厚くすると
ともに、ビード部１０Ａの周方向の剛性が急激に変化し
て負荷転動時に空気入りタイヤ１０の回転方向の変形が
集中し、ビード部１０Ａが故障に至ることがないように
ビードベース部１０Ｂ付近からタイヤ最大幅位置Ｍにか
けてビード部１０Ａの肉厚を漸次減少させている。The rim 31 has a bead seat portion 3 which is inclined at an inclination angle A with respect to the rotational axis of the pneumatic tire 10.
1A, and the pneumatic tire 10 is attached to the rim 31.
Bead portion 10 of the pneumatic tire 10 when
A is seated on each bead seat portion 31A. Here, in the rim 31 in which the bead seat portion 31A has an inclination angle A of about 15 degrees, the height H of the rim flange 31B is considerably low from 0.020 times to 0.029 times the rim base diameter D, and the bead portion 10A Since it is difficult to suppress circumferential slip between the pneumatic tire 10 and the rim 31 only by the joining force between the rim flange 31B and the rim flange 31B, the pneumatic tire 10 mounted on the rim 31 has a bead base portion 10B. In order to prevent the bead portion from being damaged due to slippage between the pneumatic tire 10 and the rim 31 by generating a joining force between the pneumatic tire 10 and the rim 31, between the bead seat portion 31A and the bead seat portion 31A. As the wall thickness of the portion 10B is increased, the rigidity of the bead portion 10A in the circumferential direction changes abruptly and the deformation in the rotational direction of the pneumatic tire 10 is concentrated when the load rolls. 10A is gradually reduced the thickness of the bead portion 10A from the vicinity of the bead base portion 10B toward the tire maximum width position M so as not to lead to failure.
【００２５】そして、このような空気入りタイヤ１０に
荷重を負荷しながら走行させると、空気入りタイヤ１０
の接地側のサイドウォール部３０は路面からの反力を受
けて撓み、この結果、撓んだ部位の内部に応力が生じ、
この内部応力は折り返し部２０の半径方向外端２０Ａに
圧縮歪を生じさせる。Then, when the pneumatic tire 10 is made to travel while applying a load, the pneumatic tire 10
The sidewall portion 30 on the ground side of the vehicle bends by receiving a reaction force from the road surface, and as a result, stress is generated inside the bent portion,
This internal stress causes a compressive strain at the radially outer end 20A of the folded portion 20.
【００２６】このため、本実施例では、サイドウォール
部３０のタイヤ外表面２７に、周方向に離れた多数の凹
部３６を形成したものである。ここで、これら凹部３６
は、その最深部３６Ａが折り返し部２０の半径方向外端
２０Ａとタイヤ最大幅位置Ｍとの間に位置していればよ
く、例えば、凹部３６の半径方向外側部が部分的にタイ
ヤ最大幅位置Ｍを越えて半径方向外側に延びていたり、
あるいは、凹部３６の半半径方向内側部が部分的に折り
返し部２０の半径方向外端２０Ａを越えて半径方向内側
に延びていても良い。このようなことから凹部３６より
半径方向外側に生じている内部応力がこの凹部３６によ
って遮断され、折り返し部２０の半径方向外端２０Ａへ
の内部応力の影響が低減されるのである。Therefore, in this embodiment, a large number of recesses 36 are formed on the outer surface 27 of the tire of the sidewall portion 30 and are separated in the circumferential direction. Here, these recesses 36
Need only have its deepest portion 36A located between the radial outer end 20A of the folded-back portion 20 and the tire maximum width position M. For example, the radially outer portion of the recessed portion 36 is partially located at the tire maximum width position. Extending beyond M in the radial direction,
Alternatively, the semi-radially inner portion of the recess 36 may partially extend radially inward beyond the radially outer end 20A of the folded-back portion 20. As a result, the internal stress generated radially outside the recess 36 is blocked by the recess 36, and the effect of the internal stress on the radially outer end 20A of the folded portion 20 is reduced.
【００２７】ここで、前述のように、特にビードベース
部１０Ｂの傾斜角Ａが１５度程度である空気入りタイヤ
１０は、ビード部１０Ａを構成する各部がビード部１０
Ａの耐久性を向上させる機能を分担しているため、多数
の凹部３６を形成すると、凹部３６によって低減される
負荷転動時の折り返し部２０の半径方向外端２０Ａの圧
縮歪み量が、周方向に沿って凹部３６がある部分と、凹
部３６が無い部分とで不均一となって、凹部３６の無い
部分から故障が先に発生する。このため、ビード部耐久
性の効果が低減する。Here, as described above, in the pneumatic tire 10 in which the bead base portion 10B has an inclination angle A of about 15 degrees, each portion constituting the bead portion 10A is a bead portion 10.
Since the function of improving the durability of A is shared, when a large number of recesses 36 are formed, the amount of compressive strain at the radially outer end 20A of the folded-back portion 20 during load rolling, which is reduced by the recesses 36, is reduced. The portion having the concave portion 36 and the portion having no concave portion 36 along the direction become non-uniform, and the failure occurs first from the portion having no concave portion 36. Therefore, the effect of durability of the bead portion is reduced.
【００２８】このため、本実施例では、図１に示される
如く、軸方向から見た凹部３６の形状を略平行四辺形と
し、隣接する凹部３６に半径方向（図１の上下方向）に
対して互いに重複する領域Ｗを形成するオーバーラップ
部分３６Ｂを設けている。Therefore, in this embodiment, as shown in FIG. 1, the shape of the recess 36 viewed from the axial direction is a substantially parallelogram, and adjacent recesses 36 are formed in the radial direction (vertical direction in FIG. 1). And an overlapping portion 36B that forms a region W overlapping with each other is provided.
【００２９】なお、図２に示される如く、凹部３６の半
径方向長さＬは、例えば、折り返し部２０の半径方向外
端２０Ａからタイヤ最大幅位置Ｍまでの距離の０．６倍
程度としても良く、また０．３倍程度としても良い。As shown in FIG. 2, the radial length L of the recess 36 may be, for example, about 0.6 times the distance from the radial outer end 20A of the folded portion 20 to the tire maximum width position M. Good, or about 0.3 times.
【００３０】また、凹部３６の深さＧは、形成位置（凹
部３６Ａの位置）におけるタイヤ厚さＣの１／１０〜１
／２であることが好ましい。１／１０未満であると、凹
部によるビード耐久性向上の効果が薄れてしまい、１／
２を越えると凹部に応力が集中して著大な歪が生じ、こ
の結果、しわやわれが発生してビード部耐久性が逆に低
下してしまうのである。The depth G of the recess 36 is 1/10 to 1 of the tire thickness C at the formation position (position of the recess 36A).
It is preferably / 2. If it is less than 1/10, the effect of improving the bead durability due to the concave portion is diminished, and
If it exceeds 2, stress is concentrated in the recesses and a large strain is generated. As a result, wrinkles and wrinkles occur and the durability of the bead portion is deteriorated.
【００３１】なお、本実施例では、図１に示される如
く、軸方向から見た凹部３６の形状を略平行四辺形とし
たが、軸方向から見た凹部３６の形状はこれに限定され
ず、図３に示される如く、略三角形状とし上下逆に交互
に配置しても良く、他の形状としても良い。In this embodiment, as shown in FIG. 1, the shape of the recess 36 viewed from the axial direction is a substantially parallelogram, but the shape of the recess 36 viewed from the axial direction is not limited to this. 3, as shown in FIG. 3, they may be formed in a substantially triangular shape and may be alternately arranged upside down, or may have another shape.
【００３２】（試験例１）３種類の従来例の空気入りタ
イヤと２種類の実施例の空気入りタイヤとを表１の仕様
（各タイヤのサイズは１１／７０Ｒ２２．５、）でそれ
ぞれ試作して、各タイヤに８．５Kgf/cm2 の内圧を充填
すると共に、５０００Kgの荷重を作用させ、速度６０km
/hでドラム走行し、カーカスプライの折り返し端部に亀
裂が発生し走行不能になった時の走行距離を測定し、こ
の測定結果を従来例１の結果２５９００kmを１００とし
た耐久性指数で表１に示した。また、ダイヤブルクラッ
クの有無を調べその結果を表１に示した。(Test Example 1) Three types of conventional pneumatic tires and two types of pneumatic tires of Examples were prototyped according to the specifications in Table 1 (each tire size is 11 / 70R22.5). Then, each tire is filled with an internal pressure of 8.5 Kgf / cm 2 and a load of 5000 Kg is applied, and the speed is 60 km.
The running distance was measured when the carcass ply was run on the drum at a speed of / h and the carcass ply was not able to run due to cracks at the folded end. Shown in 1. In addition, the presence or absence of diamond black was examined and the results are shown in Table 1.
【００３３】なお、各空気入りタイヤの凹部は、全て折
り返し部の半径方向外側から半径方向外側に１５mmだけ
離れた位置に設けられ、最深部の深さが該部において凹
部がない場合のタイヤ厚さ２８mmの１／３とされ、半径
方向長さＬが４５mmとされている。It should be noted that the recesses of each pneumatic tire are all provided at positions separated by 15 mm from the outer side in the radial direction of the folded portion to the outer side in the radial direction, and the depth of the deepest part is the tire thickness when there is no recess in the part. The length L is set to 1/3 and the radial length L is set to 45 mm.
【００３４】また、従来例２は図５に示されるように、
凹部８２が矩形に近い扇形であって、凹部８２を形成す
る辺のうち径方向内側で周方向に延びる辺の長さＴは５
２mm、また隣接する凹部間距離Ｓは、上記辺の端同士の
間を測ったとき３４mmであった。Further, in Conventional Example 2, as shown in FIG.
The concave portion 82 has a fan shape close to a rectangle, and of the sides forming the concave portion 82, the length T of the side extending radially inward in the circumferential direction is 5.
The distance S between adjacent recesses was 2 mm, and it was 34 mm when measured between the ends of the sides.
【００３５】従来例３は図７に示されるように、凹部８
３が略平行四辺形であって、凹部８３を形成する辺のう
ち径方向内側で周方向に延びる辺の長さＴは５２mm、ま
た隣接する凹部間距離Ｓは、上記辺の端同士の間を測っ
たとき３４mmであり、凹部８３の内角は略６０°と略１
２０°であった。In the conventional example 3, as shown in FIG.
3 is a substantially parallelogram, of the sides forming the recess 83, the length T of the side extending in the circumferential direction on the radially inner side is 52 mm, and the distance S between adjacent recesses is the distance between the ends of the sides. Is 34 mm, and the internal angle of the recess 83 is about 60 ° and about 1
It was 20 °.
【００３６】実施例１は図１に示されるように、凹部３
６が略平行四辺形であって、凹部３６を形成する辺のう
ち径方向内側で周方向に延びる辺の長さＴは５２mm、ま
た隣接する凹部間距離Ｓは、上記辺の端同士の間を測っ
たとき１６mmで、オーバーラップ部分の周方向長さＷは
１０mmであり、凹部３６の内角は略６０°と略１２０°
であった。In the first embodiment, as shown in FIG.
6 is a substantially parallelogram, and of the sides forming the recess 36, the length T of the side extending radially inward in the circumferential direction is 52 mm, and the distance S between adjacent recesses is the distance between the ends of the sides. Is 16 mm, the circumferential length W of the overlap portion is 10 mm, and the internal angle of the recess 36 is about 60 ° and about 120 °.
Met.
【００３７】実施例２は図３に示されるように、凹部３
６が略正三角形であって、凹部３６を形成する辺のうち
底辺の長さＴは５２mmで、隣接する凹部間距離Ｓは、径
方向内側で１６mmであった。In the second embodiment, as shown in FIG.
6 is a substantially equilateral triangle, the length T of the bottom side among the sides forming the recess 36 is 52 mm, and the distance S between adjacent recesses is 16 mm on the radially inner side.
【００３８】[0038]
【表１】 [Table 1]
【００３９】表１の結果から、本発明の空気入りタイヤ
が優れていることが明らかとなった。From the results shown in Table 1, it was revealed that the pneumatic tire of the present invention is excellent.
【００４０】[0040]
【発明の効果】本発明は前記構成としたので、凹部の効
果を周方向に沿って均一にして、ビード部耐久性を向上
させることができるという優れた効果を有する。Since the present invention has the above-mentioned structure, it has an excellent effect that the effect of the concave portion can be made uniform along the circumferential direction and the durability of the bead portion can be improved.
【図１】本発明の一実施例に係る空気入りタイヤのサイ
ドウォールを示す側面図である。FIG. 1 is a side view showing a sidewall of a pneumatic tire according to an embodiment of the present invention.
【図２】本発明の一実施例に係る空気入りタイヤの１／
４を示す子午線断面図である。FIG. 2 is 1 / of a pneumatic tire according to an embodiment of the present invention
4 is a meridian sectional view showing FIG.
【図３】本発明の他の実施例に係る空気入りタイヤのサ
イドウォールを示す側面図である。FIG. 3 is a side view showing a sidewall of a pneumatic tire according to another embodiment of the present invention.
【図４】従来例に係る空気入りタイヤのビード部近傍を
示す拡大子午線断面図である。FIG. 4 is an enlarged meridian sectional view showing the vicinity of a bead portion of a pneumatic tire according to a conventional example.
【図５】従来例に係る空気入りタイヤのサイドウォール
を示す側面図である。FIG. 5 is a side view showing a sidewall of a pneumatic tire according to a conventional example.
【図６】他の従来例に係る空気入りタイヤのサイドウォ
ールを示す側面図である。FIG. 6 is a side view showing a sidewall of a pneumatic tire according to another conventional example.
【図７】他の従来例に係る空気入りタイヤのサイドウォ
ールを示す側面図である。FIG. 7 is a side view showing a sidewall of a pneumatic tire according to another conventional example.
１０ 空気入りタイヤ １２ ビード １６ カーカスプライ １８ 本体部 ２０ 折り返し部（外側プライ） ２０Ａ 半径方向外端 ２７ タイヤ外表面 ３０ サイドウォール ３６ 凹部 ３６Ａ 最深部 ３６Ｂ オーバーラップ部分 Ｍ タイヤ最大幅位置 10 Pneumatic Tire 12 Bead 16 Carcass Ply 18 Body Part 20 Folding Part (Outer Ply) 20A Radial Outer End 27 Tire Outer Surface 30 Sidewall 36 Recess 36A Deepest Part 36B Overlap Part M Tire Maximum Width Position
Claims (1)
本体部を有すると共にビードの軸方向外側に前記本体部
に沿って延びる外側プライを有し、前記外側プライの半
径方向外端とタイヤ最大幅位置との間のタイヤ外表面に
周方向に離れた多数の凹部が形成された空気入りタイヤ
において、 隣接する前記凹部が半径方向に対して互いに重複するオ
ーバーラップ部分をそれぞれ有することを特徴とする空
気入りタイヤ。1. A carcass ply body is provided axially inward of the bead, and an outer ply extending along the body is provided axially outward of the bead. A radial outer end of the outer ply and a tire maximum width are provided. In a pneumatic tire in which a large number of circumferentially spaced recesses are formed on the outer surface of the tire between the positions, the adjacent recesses each have overlapping portions that overlap each other in the radial direction. Pneumatic tires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19091392A JP3155357B2 (en) | 1992-07-17 | 1992-07-17 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19091392A JP3155357B2 (en) | 1992-07-17 | 1992-07-17 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0632121A true JPH0632121A (en) | 1994-02-08 |
| JP3155357B2 JP3155357B2 (en) | 2001-04-09 |
Family
ID=16265799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19091392A Expired - Fee Related JP3155357B2 (en) | 1992-07-17 | 1992-07-17 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3155357B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002059712A (en) * | 2000-08-14 | 2002-02-26 | Bridgestone Corp | Pneumatic tire |
| JP2011031812A (en) * | 2009-08-04 | 2011-02-17 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| US20140144565A1 (en) * | 2011-07-29 | 2014-05-29 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US20150013869A1 (en) * | 2012-02-27 | 2015-01-15 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US20160016440A1 (en) * | 2013-02-22 | 2016-01-21 | Bridgestone Corporation | Tire |
| CN105522870A (en) * | 2014-10-20 | 2016-04-27 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN111301064A (en) * | 2018-12-11 | 2020-06-19 | 通伊欧轮胎株式会社 | Pneumatic tire |
-
1992
- 1992-07-17 JP JP19091392A patent/JP3155357B2/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002059712A (en) * | 2000-08-14 | 2002-02-26 | Bridgestone Corp | Pneumatic tire |
| JP2011031812A (en) * | 2009-08-04 | 2011-02-17 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| US9493040B2 (en) * | 2011-07-29 | 2016-11-15 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US20140144565A1 (en) * | 2011-07-29 | 2014-05-29 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US10000095B2 (en) * | 2012-02-27 | 2018-06-19 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire with dimples on one or both sidewall outer surfaces |
| US20150013869A1 (en) * | 2012-02-27 | 2015-01-15 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US20160016440A1 (en) * | 2013-02-22 | 2016-01-21 | Bridgestone Corporation | Tire |
| US10195910B2 (en) * | 2013-02-22 | 2019-02-05 | Bridgestone Corporation | Tire |
| CN105522870A (en) * | 2014-10-20 | 2016-04-27 | 住友橡胶工业株式会社 | Pneumatic tire |
| EP3012122A1 (en) * | 2014-10-20 | 2016-04-27 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| JP2016078723A (en) * | 2014-10-20 | 2016-05-16 | 住友ゴム工業株式会社 | Pneumatic tire |
| CN105522870B (en) * | 2014-10-20 | 2019-05-07 | 住友橡胶工业株式会社 | Pneumatic tire |
| US10315466B2 (en) * | 2014-10-20 | 2019-06-11 | Sumitomo Rubber Industries Ltd. | Pneumatic tire |
| CN111301064A (en) * | 2018-12-11 | 2020-06-19 | 通伊欧轮胎株式会社 | Pneumatic tire |
| US11529830B2 (en) * | 2018-12-11 | 2022-12-20 | Toyo Tire Corporation | Pneumatic tire with rim protector including plurality of recesses |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3155357B2 (en) | 2001-04-09 |
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| LAPS | Cancellation because of no payment of annual fees |