JPH06320919A - Pneumatic radial tire - Google Patents

Pneumatic radial tire

Info

Publication number
JPH06320919A
JPH06320919A JP5115962A JP11596293A JPH06320919A JP H06320919 A JPH06320919 A JP H06320919A JP 5115962 A JP5115962 A JP 5115962A JP 11596293 A JP11596293 A JP 11596293A JP H06320919 A JPH06320919 A JP H06320919A
Authority
JP
Japan
Prior art keywords
tire
peripheral position
sidewall
inner peripheral
annular recess
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
JP5115962A
Other languages
Japanese (ja)
Other versions
JP3355217B2 (en
Inventor
Makoto Furukawa
真 古川
Shinichi Furuya
信一 古屋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP11596293A priority Critical patent/JP3355217B2/en
Publication of JPH06320919A publication Critical patent/JPH06320919A/en
Application granted granted Critical
Publication of JP3355217B2 publication Critical patent/JP3355217B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To provide a pneumatic radial tire which has sufficient resisting force against cornering force generated in the tire in the case of cornering run, and gripping limit performance to prevent the sudden occurrence of side slip by arrangedly providing an annular recess and a reinforcing layer at a proper position on the casing rubber of a sidewall. CONSTITUTION:A pneumatic radial tire 1 has a pair of beads 2, a sidewall 3 extending outward in the radial direction of the tire from the bead 2, and a tread 4 which spans over the sidewall 3 and toroidally extends, and the sidewall 3 on at least one side has an annular recess 7 being hollow from the surface at least at a inner peripheral position 6 between the outer peripheral position 5 and the inner peripheral position 6. In addition, a reinforcing layer 9 composed of the rubberized layer of a cord obliquely arranged within a range of 40 deg. to 70 deg. to the radial direction of the tire is provided at the maximum width position 8 of the tire between the outer peripheral position 5 and the inner peripheral position 6 of the sidewall 3 having at least the annular recess 7.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、良好な操縦安定性、特
にコーナリング走行の際にタイヤに発生するコーナリン
グフォースに対する十分な抵抗力をもち、かつ、横滑り
が急激に生じないグリップ限界性能を有する空気入りラ
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 has good steering stability, in particular, sufficient resistance to the cornering force generated in the tire during cornering, and has a grip limit performance in which side skid does not suddenly occur. The present invention relates to a pneumatic radial tire.

【0002】[0002]

【従来の技術】空気入りタイヤの操縦安定性を向上させ
るには、ベルト剛性を高めるのが有益である。特に、コ
ーナリング走行時においては、コーナリングフォースが
タイヤに作用するため、タイヤにかかる荷重が、タイヤ
の接地面の車両外側に大きくかかるようになり、このと
き、ベルト剛性を大きくすると、コーナリングフォース
に対する抵抗力が大きくなるため、グリップ限界性能が
高まる。しかし、ベルト剛性を大きくすると、ベルトの
伸び量が減少するため、タイヤ接地面の車両内側で浮き
上がりが生じやすくなる。このため、グリップ限界性能
を超えたときに、急激な横滑りが生じやすく安全性を悪
化させるおそれがある。よって、ベルト剛性の調整で操
縦安定性の向上を図ることは、安全性を低下させるおそ
れがあるので好ましくない。
2. Description of the Related Art In order to improve the steering stability of a pneumatic tire, it is beneficial to increase the belt rigidity. In particular, during cornering, since the cornering force acts on the tire, the load applied to the tire is applied to the outside of the vehicle on the contact surface of the tire.At this time, if the belt rigidity is increased, the resistance to the cornering force is increased. Since the force is increased, the grip limit performance is improved. However, when the belt rigidity is increased, the amount of expansion of the belt is reduced, so that the belt is likely to lift up inside the vehicle on the tire contact surface. Therefore, when the grip limit performance is exceeded, a sudden skid is likely to occur, which may deteriorate safety. Therefore, it is not preferable to improve steering stability by adjusting the belt rigidity, because it may reduce safety.

【0003】そのため、コーナリング時における急激な
横滑りが生じにくいタイヤを、ベルト剛性を調整するこ
となくして得るには、タイヤ接地面の接地圧、特にコー
ナリング時に実接地面となる、タイヤ赤道面から車両外
側の範囲のタイヤ接地面での接地圧を均一にするのが有
益である。この接地圧の均一化を図るには、サイドウォ
ール部の外皮ゴムにその外皮ゴム表面から窪ませた環状
凹部を適宜設ければよいことが、特開昭第64─525
03号公報および特開平第3─186409号公報に記
載されている。
Therefore, in order to obtain a tire which is unlikely to cause sudden skid during cornering without adjusting the belt rigidity, the contact pressure of the tire contact surface, especially the actual contact surface during cornering, from the tire equatorial surface to the vehicle. It is beneficial to have a uniform contact pressure on the tire contact surface in the outer area. In order to make the contact pressure uniform, it is necessary to appropriately provide an annular recess formed in the outer rubber of the sidewall portion from the surface of the outer rubber, as disclosed in JP-A-64-525.
No. 03 and Japanese Patent Laid-Open No. 3-186409.

【0004】[0004]

【発明が解決しようとする課題】しかし、サイドウォー
ル部に環状凹部を設けると、コーナリング走行時におけ
るタイヤの前記実接地面内における接地圧の均一化は図
れるものの、タイヤの横剛性が低下するため、トータル
性能としての操縦安定性が十分でないことがその後の研
究で明らかとなった。
However, if an annular recess is provided in the sidewall portion, the contact pressure within the actual contact surface of the tire during cornering can be made uniform, but the lateral rigidity of the tire decreases. However, it was revealed in the subsequent research that the driving stability as total performance was not sufficient.

【0005】そこで本発明は、サイドウォール部の外皮
ゴムの適正位置に環状凹部および補強層を配設すること
により、コーナリング走行の際にタイヤに発生するコー
ナリングフォースに対する十分な抵抗力があり、かつ横
滑りが急激に生じないグリップ限界性能を有する空気入
りラジアルタイヤを完成させることを目的とする。
Therefore, according to the present invention, by disposing the annular recess and the reinforcing layer at appropriate positions of the outer rubber of the sidewall portion, there is sufficient resistance to the cornering force generated in the tire during cornering, and It is an object of the present invention to complete a pneumatic radial tire having a grip limit performance in which skidding does not occur abruptly.

【0006】[0006]

【課題を解決するための手段】本発明は、一対のビード
部と、該ビード部からそれぞれタイヤ半径方向外側に延
びるサイドウォール部と、該サイドウォール部にまたが
りトロイド状に延びるトレッド部とを有する空気入りラ
ジアルタイヤにおいて、サイドウォール部の少なくとも
一方にて、その外周位置および内周位置のうち少なくと
も内周位置に表面から窪んだ環状凹部を有し、かつ、少
なくとも環状凹部を有するサイドウォール部の外周位置
と内周位置との間に、タイヤ最大幅位置にて、タイヤ半
径方向に対し40〜70°の範囲で傾斜配列したコード
のゴム引き層からなる補強層を有することを特徴とする
空気入りラジアルタイヤである。また、環状凹部が、一
方のサイドウォール部の外周位置および内周位置のうち
少なくとも内周位置と、他方のサイドウォール部の外周
位置および内周位置のうち少なくとも外周位置とに配置
してなること、環状凹部が、タイヤの車両装着姿勢で、
車両外側のサイドウォール部の前記外周位置と、車両内
側のサイドウォール部の前記内周位置にあり、前記補強
層が車両内側のサイドウォール部にあることを特徴とす
る請求項1に記載の空気入りラジアルタイヤ一対のビー
ド部と、該ビード部からそれぞれタイヤ半径方向外側に
延びるサイドウォール部と、該サイドウォール部にまた
がりトロイド状に延びるトレッド部とを有すること、が
より好ましい。
SUMMARY OF THE INVENTION The present invention has a pair of bead portions, a sidewall portion extending outward from each of the bead portions in the radial direction of the tire, and a tread portion extending in a toroidal shape across the sidewall portions. In a pneumatic radial tire, in at least one of the sidewall portions, at least one of the outer peripheral position and the inner peripheral position has an annular concave portion recessed from the surface, and at least the sidewall portion having the annular concave portion. Between the outer peripheral position and the inner peripheral position, at the tire maximum width position, there is provided a reinforcing layer made of a rubberized layer of cords arranged in a slanting arrangement in the range of 40 to 70 ° with respect to the tire radial direction. It is a radial tire containing. In addition, the annular concave portion is arranged at least at the inner circumferential position of the outer circumferential position and the inner circumferential position of one sidewall portion and at least the outer circumferential position of the outer circumferential position and the inner circumferential position of the other sidewall portion. , The annular recess is in the vehicle mounting posture of the tire,
2. The air according to claim 1, wherein the outer peripheral position of the sidewall portion on the vehicle outer side and the inner peripheral position of the sidewall portion on the vehicle inner side are present, and the reinforcing layer is on the sidewall portion on the vehicle inner side. It is more preferable to have a pair of bead portions of the filled radial tire, sidewall portions extending outward from the bead portions in the tire radial direction, and a tread portion extending in a toroidal shape across the sidewall portions.

【0007】図1に本発明にしたがう代表的な空気入り
ラジアルタイヤを示し、図中1は空気入りラジアルタイ
ヤ、2はビード部、3はサイドウォール部、4はトレッ
ド部、5はサイドウォール部の外周位置、6はサイドウ
ォール部の内周位置、7は環状凹部、8はタイヤ最大幅
位置、9は補強層である。図1に示す空気入りラジアル
タイヤ1は、一対のビード部2と、該ビード部2からそ
れぞれタイヤ半径方向外側に延びるサイドウォール部3
と、該サイドウォール部3にまたがりトロイド状に延び
るトレッド部4とを有し、一方のサイドウォール部3の
外周位置5と内周位置6、および他方のサイドウォール
部3の外周位置5に、表面から窪んだ環状凹部7を有
し、かつ、両サイドウォール部3の外周位置5と内周位
置6との間に、タイヤ最大幅位置8にて、タイヤ半径方
向に対し40〜70°の範囲で傾斜配列したコードのゴ
ム引き層からなる補強層9をそれぞれ有している。この
補強層9の前記コード傾斜角度が、40°未満だとコー
ド長が短くなるため、横剛性の補強効果が小さく、70
°を超えるとタイヤ成形上の問題が生じるおそれがあ
る。また、このコードの材質は、ナイロン、レーヨン、
ポリエステル等の有機繊維が好ましいが、サイドウォー
ル部3の補強の程度に応じてその他の材質のコードにつ
いても適宜選択して使用することができる。
FIG. 1 shows a typical pneumatic radial tire according to the present invention. In the figure, 1 is a pneumatic radial tire, 2 is a bead portion, 3 is a sidewall portion, 4 is a tread portion, 5 is a sidewall portion. The outer peripheral position, 6 is the inner peripheral position of the sidewall portion, 7 is the annular recessed portion, 8 is the maximum tire width position, and 9 is the reinforcing layer. A pneumatic radial tire 1 shown in FIG. 1 includes a pair of bead portions 2 and sidewall portions 3 that extend outward from the bead portions 2 in the tire radial direction.
And a tread portion 4 extending in a toroidal shape over the sidewall portion 3, and at an outer peripheral position 5 and an inner peripheral position 6 of one sidewall portion 3, and an outer peripheral position 5 of the other sidewall portion 3, It has an annular recess 7 recessed from the surface, and is between the outer peripheral position 5 and the inner peripheral position 6 of both sidewall parts 3 at a tire maximum width position 8 of 40 to 70 ° with respect to the tire radial direction. Each has a reinforcing layer 9 made of a rubberized layer of cords arranged in a tilted manner within the range. If the cord inclination angle of the reinforcing layer 9 is less than 40 °, the cord length becomes short, so that the reinforcing effect of lateral rigidity is small, and
If it exceeds °, there may be problems in tire molding. The material of this cord is nylon, rayon,
Organic fibers such as polyester are preferable, but cords made of other materials can be appropriately selected and used according to the degree of reinforcement of the sidewall portion 3.

【0008】サイドウォール部3の外周位置5および内
周位置6に配設する環状凹部7と、外周位置5と内周位
置6との間に配設する補強層9は、コーナリング走行時
のタイヤの実接地面内での接地圧の均一性と横剛性との
バランスを考慮して、それらの配置位置、大きさ、形状
等を適宜選択することができる。また、環状凹部を、一
方のサイドウォール部の外周位置および内周位置のうち
少なくとも内周位置と、他方のサイドウォール部の外周
位置および内周位置のうち少なくとも外周位置とに配置
すること、特に、図2に示すように、タイヤの車両装着
姿勢で、前記環状凹部7を、車両外側17のサイドウォ
ール部3の外周位置5と、車両内側16のサイドウォー
ル部3の内周位置6に配置し、かつ、補強層9を車両内
側16のサイドウォール部3に配置することが、前記し
た接地圧の均一性と横剛性とのバランスの点から好まし
い。
The annular recesses 7 provided at the outer peripheral position 5 and the inner peripheral position 6 of the sidewall portion 3 and the reinforcing layer 9 provided between the outer peripheral position 5 and the inner peripheral position 6 are tires during cornering. Considering the balance between the uniformity of the ground contact pressure within the actual ground contact surface and the lateral rigidity, the arrangement position, size, shape, etc. of them can be appropriately selected. Further, the annular recess is arranged at least at the inner peripheral position of the outer peripheral position and the inner peripheral position of one sidewall part and at least the outer peripheral position of the outer peripheral position and the inner peripheral position of the other sidewall part, As shown in FIG. 2, when the tire is mounted on the vehicle, the annular recesses 7 are arranged at the outer peripheral position 5 of the sidewall portion 3 on the vehicle outer side 17 and the inner peripheral position 6 of the sidewall portion 3 on the vehicle inner side 16. In addition, it is preferable to dispose the reinforcing layer 9 on the sidewall portion 3 on the vehicle inner side 16 in terms of the balance between the uniformity of the ground contact pressure and the lateral rigidity.

【0009】[0009]

【作用】環状凹部をサイドウォール部に配設したタイヤ
は、タイヤ接地面における接地圧の均一化が図れる一
方、横剛性が低下するという欠点を有していることを上
述したが、さらに細かく言えば、サイドウォール部の外
周位置に配設した環状凹部と、内周位置に配設した環状
凹部とは、タイヤに及ぼす作用がそれぞれ異なるので説
明し、その後に本発明についての作用を説明する。 (1)環状凹部をサイドウォール部の外周位置に設けた
場合 環状凹部をサイドウォール部の外周位置で、特に車両装
着姿勢でタイヤの車両外側に配設した場合は、タイヤに
負荷がかかったときに、この環状凹部の存在により、サ
イドウォール部の変形の大部分が、環状凹部とビード部
間のサイドウォール部で生じるため、環状凹部からトレ
ッド側のサイドウォール部の地面方向への変形、いわゆ
る倒れ込み変形が、環状凹部を持たない従来タイヤに比
し小さくなり、この倒れ込み変形とともにベルト端を地
面方向に押しつけていた力も減少するためトレッド接地
端の接地圧が減少し、特にコーナリング走行時に実接地
面となる、タイヤ赤道から車両外側の範囲のタイヤ接地
面での接地圧の均一化が図れる。図3に参考としてサイ
ドウォール部3の外表面輪郭の荷重負荷による変形状態
を模式的に示す。前記外表面輪郭の前記環状凹部相当位
置Aに接線を引き、この接線の地面14とのなす角を、
タイヤ負荷状態10でθ1、タイヤ無負荷状態11でθ
2とし、この角度の差をθ2ーθ1として、このθ2ー
θ1の値を、環状凹部をもつタイヤと、環状凹部をもた
ないタイヤについてそれぞれ表1に示し、併せて、コー
ナリング時の実接地面内において、タイヤ赤道面14か
ら車両外側方向に65mm離れた位置での接地圧をP
1、タイヤ赤道面14から車両外側方向に30mm離れ
た位置での接地圧をP2としたときの接地圧比P2/P
1についても示した。表1の結果からも、前述した作用
を裏付けている。
It has been described above that the tire having the annular concave portion in the sidewall portion has the drawback that the contact pressure on the tire contact surface can be made uniform, but the lateral rigidity is lowered, but it can be said in more detail. For example, the annular recessed portion provided at the outer peripheral position of the sidewall portion and the annular recessed portion provided at the inner peripheral position have different effects on the tires, and therefore the operation will be described, and then the operation of the present invention will be described. (1) When the annular recess is provided at the outer peripheral position of the sidewall part When the annular recess is provided at the outer peripheral position of the sidewall part, particularly on the vehicle outer side of the tire in the vehicle mounting posture, when a load is applied to the tire In addition, because of the presence of the annular recess, most of the deformation of the sidewall part occurs in the sidewall part between the annular recess and the bead part, so that the sidewall part on the tread side is deformed from the annular recess in the ground direction, so-called. The collapse deformation is smaller than that of a conventional tire that does not have an annular recess, and the force that presses the belt end toward the ground is also reduced along with this collapse deformation, so the ground contact pressure at the tread ground contact end is reduced, especially during cornering. It is possible to make the contact pressure uniform on the tire contact surface in the range from the tire equator to the vehicle outer side, which is the ground. For reference, FIG. 3 schematically shows a deformed state of the outer surface contour of the sidewall portion 3 due to a load. A tangent line is drawn at the position A corresponding to the annular recess of the outer surface contour, and the angle formed by the tangent line with the ground 14 is
Θ1 in tire loaded state 10 and θ in tire unloaded state 11
2, the difference between these angles is θ2-θ1, and the values of θ2-θ1 are shown in Table 1 for tires with annular recesses and tires without annular recesses, respectively, and also for actual contact during cornering. The ground contact pressure at a position 65 mm away from the tire equatorial plane 14 in the vehicle outer direction in the ground is P
1. The ground contact pressure ratio P2 / P where P2 is the ground contact pressure at a position 30 mm away from the tire equatorial plane 14 in the vehicle outer direction.
1 is also shown. The results shown in Table 1 also support the above-mentioned effects.

【0010】[0010]

【表1】 [Table 1]

【0011】(2)環状凹部をサイドウォール部の内周
位置に設けた場合 図4に、サイドウォール部3の内周相当位置Cで、特に
前記車両内側16に、環状凹部を有するタイヤ12と環
状凹部を有しないタイヤ13に横力が作用したときのサ
イドウォール部3の外表面輪郭の変形状態を示す。仮
に、トレッド接地端Bの地面と平行な変位wを一定とし
たとき、環状凹部を有するタイヤ12と環状凹部をもた
ないタイヤ13の各トレッド接地端Bの、地面と垂直な
変位d1、d2を測定した結果を表2に示す。
(2) When the annular concave portion is provided at the inner peripheral position of the sidewall portion. FIG. 4 shows a tire 12 having an annular concave portion at a position C corresponding to the inner peripheral portion of the sidewall portion 3, particularly on the inside 16 of the vehicle. The deformation | transformation state of the outer surface contour of the sidewall part 3 when a lateral force acts on the tire 13 which does not have an annular recessed part is shown. If the displacement w of the tread ground contact end B parallel to the ground is constant, the vertical displacements d1 and d2 of the tread ground contact end B of each of the tire 12 having the annular recess and the tire 13 having no annular recess. Table 2 shows the result of measurement.

【0012】[0012]

【表2】 [Table 2]

【0013】表2の結果から、前記内周相当位置Cに環
状凹部を有するタイヤ12は、この環状凹部からトレッ
ド側のサイドウォール部が、環状凹部をもたないタイヤ
13に比べ、大きく変形し、かつサイドウォール部長さ
は実質一定であるので、環状凹部を有するタイヤ12の
前記垂直変位d1は環状凹部をもたないタイヤ13の前
記垂直変位d2に比し、小さくなる。この結果、トレッ
ドの地面に対するトレッド幅方向の傾斜が小さくなり、
タイヤ接地面のトレッド幅方向の接地圧の均一化が図れ
る。しかし、前記内周位置Cに環状凹部を設けたタイヤ
12は、環状凹部を持たないタイヤ13よりも横剛性が
低下するため、実際にはトレッド接地端Bの地面と平行
な変位wは一定にはならず、環状凹部をもつタイヤ12
の方が前記平行変位wは大きくなる。この環状凹部によ
る横剛性の低下は、前記環状凹部位置Cからトレッド側
のサイドウォール部を補強することにより、抑制するこ
とができる。
From the results shown in Table 2, in the tire 12 having the annular recess at the position C corresponding to the inner circumference, the sidewall portion on the tread side of the annular recess is largely deformed as compared with the tire 13 having no annular recess. Moreover, since the length of the sidewall portion is substantially constant, the vertical displacement d1 of the tire 12 having the annular recess is smaller than the vertical displacement d2 of the tire 13 having no annular recess. As a result, the inclination of the tread in the tread width direction with respect to the ground becomes smaller,
The contact pressure in the tread width direction of the tire contact surface can be made uniform. However, since the tire 12 having the annular recessed portion at the inner circumferential position C has lower lateral rigidity than the tire 13 having no annular recessed portion, the displacement w parallel to the ground at the tread ground contact end B is actually constant. Tire 12 having an annular recess
In this case, the parallel displacement w becomes larger. The decrease in lateral rigidity due to the annular recess can be suppressed by reinforcing the sidewall portion on the tread side from the annular recess position C.

【0014】本発明では、サイドウォール部の少なくと
も一方にて、その外周位置および内周位置のうち少なく
とも内周位置、特に車両内側に位置するサイドウォール
部の内周位置に、環状凹部を適正配置することにより、
タイヤ接地面でのタイヤ幅方向の接地圧の均一化を図る
ことができる。また、環状凹部をもつタイヤの欠点であ
った不十分な横剛性を、少なくとも環状凹部を有するサ
イドウォール部の外周位置と内周位置との間に補強層を
配置することにより、接地圧の均一性を悪化させること
なく向上させることができる。
According to the present invention, at least one of the sidewall portions has an annular recess appropriately disposed at at least the inner circumferential position of the outer circumferential position and the inner circumferential position thereof, particularly the inner circumferential position of the sidewall portion located inside the vehicle. By doing
The contact pressure in the tire width direction on the tire contact surface can be made uniform. In addition, the insufficient lateral rigidity, which was a drawback of tires with annular recesses, is eliminated by arranging a reinforcing layer at least between the outer peripheral position and the inner peripheral position of the sidewall part having annular recesses. It can be improved without deteriorating the sex.

【0015】[0015]

【実施例】本発明にしたがう空気入りラジアルタイヤの
具体的な実施例を図2を参照しながら説明する。実施例
1に使用した空気入りラジアルタイヤは、タイヤサイズ
が205/60R15であり、一対のビード部2と、該
ビード部2からそれぞれタイヤ半径方向外側に延びるサ
イドウォール部3と、該サイドウォール部3にまたがり
トロイド状に延びるトレッド部4とを有し、車両装着姿
勢で、車両内側のサイドウォール部3は、その内周位置
6に、車両外側のサイドウォール部3は、その外周位置
5に、それぞれ表面から窪んだ環状凹部7を有し、さら
に車両内側のサイドウォール部3の、外周位置5と内周
位置6との間に、タイヤ最大幅位置8にて、タイヤ半径
方向に対し45°の範囲で傾斜配列したコードゴム引き
層からなる補強層9を有している。このコードはナイロ
ン繊維からなり、そのコード長を70mmとした。環状
凹部7は、車両内側の内周位置の環状凹部が、タイヤ最
大幅位置からタイヤ半径方向外側に15mm離れた位置
に、また車両外側の外周位置の環状凹部が、タイヤ最大
幅位置からタイヤ半径方向内側に40mm離れた位置に
それぞれ配設し、この環状凹部の、外皮ゴム表面で測定
した幅を10mm、底深さを2mmとした。カーカス
は、2プライからなり、タイヤ赤道面に対し90°で配
列したポリエステルコードを使用した。ベルトは、タイ
ヤ赤道面に対し70°で交差配列したスチールコードの
ゴム引き層の2枚からなる。実施例2は、タイヤの車両
外側のサイドウォール部の、外周位置に環状凹部をもた
ないことを除いては、実施例1に使用したタイヤとほぼ
同様なタイヤである。
EXAMPLE A specific example of the pneumatic radial tire according to the present invention will be described with reference to FIG. The pneumatic radial tire used in Example 1 has a tire size of 205 / 60R15, a pair of bead portions 2, a sidewall portion 3 extending from the bead portions 2 to the outside in the tire radial direction, and the sidewall portion. 3 has a tread portion 4 extending in a toroidal shape, and the side wall portion 3 on the vehicle inner side is at an inner peripheral position 6 thereof, and the side wall portion 3 on the vehicle outer side is at an outer peripheral position 5 thereof in a vehicle mounting posture. , Each having an annular recessed portion 7 recessed from the surface, between the outer peripheral position 5 and the inner peripheral position 6 of the sidewall portion 3 on the vehicle inner side, at the tire maximum width position 8 and in the tire radial direction, 45 It has a reinforcing layer 9 composed of a cord rubberized layer which is inclined and arranged in a range of °. This cord was made of nylon fiber and had a cord length of 70 mm. The annular recessed portion 7 is such that the annular recessed portion at the inner peripheral position on the vehicle inner side is located 15 mm away from the tire maximum width position to the outer side in the tire radial direction, and the annular recessed portion on the outer peripheral side of the vehicle is the tire radius from the tire maximum width position. The annular recesses were arranged at positions separated by 40 mm inward in the direction, and the width of the annular recess measured on the surface of the outer rubber was 10 mm and the bottom depth was 2 mm. The carcass consisted of two plies and used polyester cords arranged at 90 ° to the tire equatorial plane. The belt consists of two sheets of rubberized layers of steel cords arranged in a cross at 70 ° to the tire equatorial plane. Example 2 is a tire substantially the same as the tire used in Example 1, except that the sidewall portion on the vehicle outer side of the tire does not have an annular recess at the outer peripheral position.

【0016】従来例1は、環状凹部および補強層をもた
ないことを除いては実施例で使用したタイヤとほぼ同様
な従来タイヤである。従来例2は、タイヤの車両内側の
サイドウォール部の内周位置に環状凹部をもつことを除
いては、従来例1に使用したタイヤとほぼ同様な従来タ
イヤである。従来例3は、タイヤの車両外側のサイドウ
ォール部の外周位置に環状凹部をもつことを除いては、
従来例1に使用したタイヤとほぼ同様な従来タイヤであ
る。
Conventional Example 1 is a conventional tire which is substantially the same as the tire used in the Examples except that it has no annular recess and no reinforcing layer. Conventional Example 2 is a conventional tire that is substantially the same as the tire used in Conventional Example 1 except that an annular recess is provided at the inner peripheral position of the sidewall portion of the tire on the vehicle inner side. Conventional Example 3 has an annular recess at the outer peripheral position of the sidewall portion of the tire outside the vehicle, except that
It is a conventional tire that is substantially the same as the tire used in Conventional Example 1.

【0017】次に、試験方法について説明する。試験
は、タイヤへの負荷荷重が600kgf、タイヤへの横
力が300kgfのときの上記接地圧比P2/P1と横
剛性を測定した。表3に試験結果を示す。
Next, the test method will be described. In the test, the contact pressure ratio P2 / P1 and the lateral rigidity were measured when the load applied to the tire was 600 kgf and the lateral force applied to the tire was 300 kgf. Table 3 shows the test results.

【0018】[0018]

【表3】 [Table 3]

【0019】試験結果から、実施例1及び2は、上記接
地圧比P2/P1と横剛性のいずれもが適正範囲内であ
り、従来例1〜3に比し、接地圧比および横剛性の性能
バランスの点で優れている。
From the test results, in Examples 1 and 2, both the ground contact pressure ratio P2 / P1 and the lateral rigidity are within the proper range, and the performance balance of the ground contact pressure ratio and the lateral rigidity is better than those of the conventional examples 1 to 3. Is excellent in terms of.

【0020】[0020]

【発明の効果】本発明では、サイドウォール部の少なく
とも一方にて、その外周位置および内周位置のうち少な
くとも内周位置、特に車両内側に位置するサイドウォー
ル部の内周位置に、環状凹部を適正配置することによ
り、タイヤ接地面でのタイヤ幅方向の接地圧の均一化を
図ることができ、また、環状凹部をもつタイヤの欠点で
あった不十分な横剛性を、少なくとも環状凹部を有する
サイドウォール部の外周位置と内周位置との間に補強層
を配置することにより、接地圧の均一性を悪化させるこ
となく向上させることができるので、良好な操縦安定
性、特にコーナリング走行の際にタイヤに発生するコー
ナリングフォースに対して十分に抵抗でき、また横滑り
が急激に生じないグリップ限界性能を高めた空気入りラ
ジアルタイヤの提供が可能となった。
According to the present invention, at least one of the sidewall portions is provided with an annular recess at least at the inner circumferential position of the outer circumferential position and the inner circumferential position thereof, particularly at the inner circumferential position of the sidewall portion located inside the vehicle. With proper arrangement, the contact pressure in the tire width direction on the tire contact surface can be made uniform, and the insufficient lateral rigidity, which was a drawback of a tire having an annular recess, is provided by at least the annular recess. By arranging the reinforcing layer between the outer peripheral position and the inner peripheral position of the sidewall portion, it is possible to improve the uniformity of the ground contact pressure without deteriorating, so that good steering stability, especially during cornering traveling can be obtained. It is possible to provide a pneumatic radial tire that can sufficiently resist the cornering force generated in the tire and that has improved grip limit performance that does not cause sudden skidding. It was the ability.

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

【図1】本発明にしたがう代表的な発明タイヤの幅方向
断面図である。
FIG. 1 is a cross-sectional view in the width direction of a representative invention tire according to the present invention.

【図2】実施例で使用した発明タイヤの幅方向断面図で
ある。
FIG. 2 is a cross-sectional view in the width direction of the inventive tire used in the examples.

【図3】タイヤ負荷状態10およびタイヤ無負荷状態1
1において、タイヤ幅方向断面内で環状凹部相当位置A
に接線を引き、この接線の地面とのなす角の測定方法を
示す図である。
FIG. 3 is a tire loaded state 10 and a tire unloaded state 1
1, the position A corresponding to the annular recess in the tire width direction cross section
It is a figure which shows the tangent line to and measures the angle which this tangent line makes with the ground.

【図4】タイヤ負荷後のトレッド接地端Bの無負荷状態
からの、地面と平行な変位wを一定としたときの、地面
と垂直な変位dの測定方法を示す図である。
FIG. 4 is a diagram showing a method of measuring a displacement d perpendicular to the ground when the displacement w parallel to the ground is constant from the unloaded state of the tread ground contact end B after tire loading.

【符号の説明】[Explanation of symbols]

1 空気入りラジアルタイヤ 2 ビード部 3 サイドウォール部 4 トレッド部 5 外周位置 6 内周位置 7 環状凹部 8 タイヤ最大幅 9 補強層 10 タイヤ負荷状態 11 タイヤ無負荷状態 12 環状凹部を有するタイヤ 13 環状凹部をもたないタイヤ 14 地面 15 タイヤ赤道面 16 車両内側 17 車両外側 1 Pneumatic radial tire 2 Bead part 3 Side wall part 4 Tread part 5 Outer peripheral position 6 Inner peripheral position 7 Annular recess 8 Tire maximum width 9 Reinforcement layer 10 Tire load condition 11 Tire no load condition 12 Tire with annular recess 13 Annular recess Tires without wheels 14 Ground 15 Tire equatorial plane 16 Vehicle inside 17 Vehicle outside

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 一対のビード部と、該ビード部からそれ
ぞれタイヤ半径方向外側に延びるサイドウォール部と、
該サイドウォール部にまたがりトロイド状に延びるトレ
ッド部とを有する空気入りラジアルタイヤにおいて、 サイドウォール部の少なくとも一方にて、その外周位置
および内周位置のうち少なくとも内周位置に表面から窪
んだ環状凹部を有し、かつ、少なくとも環状凹部を有す
るサイドウォール部の外周位置と内周位置との間に、タ
イヤ最大幅位置にて、タイヤ半径方向に対し40〜70
°の範囲で傾斜配列したコードのゴム引き層からなる補
強層を有することを特徴とする空気入りラジアルタイ
ヤ。
1. A pair of bead portions, and sidewall portions extending outward from the bead portions in the tire radial direction, respectively.
A pneumatic radial tire having a tread portion extending in a toroidal shape across the sidewall portion, wherein at least one of the sidewall portions has an annular recess recessed from the surface at least at an inner peripheral position of an outer peripheral position and an inner peripheral position thereof. 40 to 70 in the tire radial direction at the tire maximum width position between the outer peripheral position and the inner peripheral position of the sidewall portion having at least the annular concave portion.
A pneumatic radial tire having a reinforcing layer made of a rubberized layer of cords arranged in a tilted manner within a range of °.
【請求項2】 環状凹部を、一方のサイドウォール部の
外周位置および内周位置のうち少なくとも内周位置と、
他方のサイドウォール部の外周位置および内周位置のう
ち少なくとも外周位置とに配置してなることを特徴とす
る請求項1に記載の空気入りラジアルタイヤ。
2. The annular recess is formed at least in the inner peripheral position of the outer peripheral position and the inner peripheral position of one sidewall part,
The pneumatic radial tire according to claim 1, wherein the other sidewall portion is arranged at least at an outer peripheral position among an outer peripheral position and an inner peripheral position.
【請求項3】 環状凹部が、タイヤの車両装着姿勢で、
車両外側のサイドウォール部の前記外周位置と、車両内
側のサイドウォール部の前記内周位置にあり、前記補強
層が車両内側のサイドウォール部にあることを特徴とす
る請求項1に記載の空気入りラジアルタイヤ。
3. The annular concave portion when the tire is mounted on a vehicle,
2. The air according to claim 1, wherein the outer peripheral position of the sidewall portion on the vehicle outer side and the inner peripheral position of the sidewall portion on the vehicle inner side are present, and the reinforcing layer is on the sidewall portion on the vehicle inner side. Radial tires with.
JP11596293A 1993-05-18 1993-05-18 Pneumatic radial tire Expired - Fee Related JP3355217B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11596293A JP3355217B2 (en) 1993-05-18 1993-05-18 Pneumatic radial tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11596293A JP3355217B2 (en) 1993-05-18 1993-05-18 Pneumatic radial tire

Publications (2)

Publication Number Publication Date
JPH06320919A true JPH06320919A (en) 1994-11-22
JP3355217B2 JP3355217B2 (en) 2002-12-09

Family

ID=14675450

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11596293A Expired - Fee Related JP3355217B2 (en) 1993-05-18 1993-05-18 Pneumatic radial tire

Country Status (1)

Country Link
JP (1) JP3355217B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11139115A (en) * 1997-11-14 1999-05-25 Yokohama Rubber Co Ltd:The Pneumatic radial tire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11139115A (en) * 1997-11-14 1999-05-25 Yokohama Rubber Co Ltd:The Pneumatic radial tire

Also Published As

Publication number Publication date
JP3355217B2 (en) 2002-12-09

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