JPH0717219A - Automotive pneumatic radial tire - Google Patents

Automotive pneumatic radial tire

Info

Publication number
JPH0717219A
JPH0717219A JP16465293A JP16465293A JPH0717219A JP H0717219 A JPH0717219 A JP H0717219A JP 16465293 A JP16465293 A JP 16465293A JP 16465293 A JP16465293 A JP 16465293A JP H0717219 A JPH0717219 A JP H0717219A
Authority
JP
Japan
Prior art keywords
bead
height
radial
tire
filler
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
JP16465293A
Other languages
Japanese (ja)
Other versions
JP3355222B2 (en
Inventor
Fumihide Isobe
文秀 磯部
Masahito Hiruma
雅人 比留間
Nobuyuki Watanabe
信幸 渡辺
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 JP16465293A priority Critical patent/JP3355222B2/en
Publication of JPH0717219A publication Critical patent/JPH0717219A/en
Application granted granted Critical
Publication of JP3355222B2 publication Critical patent/JP3355222B2/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
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
    • B60C15/0607—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex comprising several parts, e.g. made of different rubbers

Abstract

PURPOSE:To improve the fuel consumption of a vehicle by reducing rolling resistance while steering stability is being maintained. CONSTITUTION:The Shore A hardness of a bead filler 6 provided between a carcass main body portion 1a and each wound-up portion 1b is made to be 75-99 degrees, and at the same time a radial height from a bead core inner peripheral surface is made to be 0.14-0.35 times the height H of a tire section, and the Shore A hardness of bead reinforcement rubber 7 provided on the outside of each wound-up portion is made to be 65-80 degrees, and the radial height from the bead core inner peripheral surface is made to be 0.28-0.6 times the height H of the tire section, and at the same time is made to be 1.5-3.5 times the same height of the bead filler 6. Also, the volume of the bead reinforcement rubber 7 is made to be 1.5-10 times that of the bead filler 6, and a bead reinforcement layer 8 arranged between the bead reinforcement rubber 7 and each wound-up portion 1b is formed of fiber cords of 840-1500d/2, and a radial inner end is positioned in the vicinity part of a bead core 5, and at the same time its radial outside is arranged at a position that is 0.3-0.5 times H from the bead core inner peripheral surface.

Description

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

【０００１】[0001]

【産業上の利用分野】この発明は、乗用車用空気入りラ
ジアルタイヤ、なかでもそのビード部構造に関するもの
であり、とくには、操縦安定性を十分高く維持しつつ、
車両の燃費効率を有効に向上させるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic radial tire for passenger cars, and more particularly to a bead structure thereof, and particularly, while maintaining a sufficiently high steering stability,
It effectively improves the fuel efficiency of the vehicle.

【０００２】[0002]

【従来の技術】乗用車用空気入りラジアルタイヤのビー
ド部構造としては、ビード部に所要の剛性を付与すべ
く、ラジアルカーカスの本体部分と巻上げ部分との間
に、比較的体積の大きいビードフィラーを配設するとと
もに、そのビード部のリムずれを防止すべく、前記巻上
げ部分の外側にチェーファを配設したものがある。2. Description of the Related Art As a bead structure of a pneumatic radial tire for passenger cars, a bead filler having a relatively large volume is provided between a main body of a radial carcass and a winding part in order to impart a required rigidity to the bead. In some cases, a chafer is provided outside the winding portion in order to prevent the bead portion from shifting the rim.

【０００３】[0003]

【発明が解決しようとする課題】ところで、近年におい
ては車両の高性能化に加えて、燃費の向上が強く要求さ
れるに至っており、タイヤにおいてもかかる要求に応え
るべく、トレッド部、サイドウォール部などの構造に変
更を加えて燃費の向上を図る技術が各種提案されてい
る。By the way, in recent years, in addition to high performance of vehicles, there has been a strong demand for improvement in fuel consumption, and in order to meet such demands in tires as well, tread portions and sidewall portions are required. Various technologies have been proposed to improve the fuel efficiency by modifying the structure.

【０００４】しかしながら、タイヤビード部は、操縦安
定性にとくに大きな影響を及ぼす部分であることから、
未だ十分な構造改善が行われていない状況にある。However, since the tire bead part is a part which has a great influence on steering stability,
The structure is not yet sufficiently improved.

【０００５】そこでこの発明は、上述したような従来の
ビード部構造に大きな変更を加えて燃費の向上を図るこ
とにより、その従来構造によってもたらされる操縦安定
性を損ねることなしに、タイヤ全体として燃費を効果的
に向上させることができる乗用車用空気入りラジアルタ
イヤを提供する。Therefore, according to the present invention, the fuel consumption of the tire as a whole is improved without deteriorating the steering stability brought about by the conventional structure by improving the fuel consumption by largely changing the above-mentioned conventional bead portion structure. Provided is a pneumatic radial tire for a passenger vehicle, which can effectively improve the tire.

【０００６】なお、燃費を向上させるためには、タイヤ
各部の歪エネルギー、ロスタンジェント、体積などを低
減させて、タイヤの転がり抵抗を小ならしめることが有
効であるので、ここではとくに、タイヤビード部の内部
ロスの低減をもってそれの実現を図ることとする。In order to improve the fuel consumption, it is effective to reduce the rolling energy of the tire by reducing the strain energy, lost tangent, volume, etc. of each part of the tire. We will try to achieve it by reducing the internal loss of parts.

【０００７】[0007]

【課題を解決するための手段】この発明の乗用車用空気
入りラジアルタイヤは、少なくとも一枚のカーカスプラ
イからなるラジアルカーカスと、このラジアルカーカス
の、本体部分と巻上げ部分との間で、ビードコアの外周
側に配設したビードフィラーと、前記巻上げ部分の外側
に配設したビード補強ゴムと、その巻上げ部分とビード
補強ゴムとの間に配設したビード補強層とを具えるもの
であって、前記ビードフィラーのショアＡ硬度を75〜99
度とするとともに、そのビードフィラーの、ビードコア
内周面からの半径方向高さを、タイヤ断面高さの0.14〜
0.35倍とし、A pneumatic radial tire for a passenger car according to the present invention comprises a radial carcass composed of at least one carcass ply, and an outer circumference of a bead core between a main body portion and a winding portion of the radial carcass. A bead filler disposed on the side, a bead reinforcing rubber disposed outside the winding portion, and a bead reinforcing layer disposed between the winding portion and the bead reinforcing rubber, wherein: Shore A hardness of bead filler is 75-99
And the radial height of the bead filler from the inner peripheral surface of the bead core is 0.14 to
0.35 times,

【０００８】前記ビード補強ゴムのショアＡ硬度を65〜
80度とし、このビード補強ゴムの、ビードコア内周面か
らの半径方向高さを、タイヤ断面高さの0.28〜0.6 倍と
するとともに、前記ビードフィラーの同様高さの1.5 〜
3.5 倍とし、また、ビード補強ゴムの体積をビードフィ
ラーのそれの1.5 〜10倍とし、The shore A hardness of the bead reinforced rubber is 65 to
The height of this bead-reinforcing rubber in the radial direction from the inner peripheral surface of the bead core is set to 0.28 to 0.6 times the tire cross-section height, and the same height as the bead filler is set to 1.5 to
3.5 times, and the volume of the bead reinforcing rubber is 1.5 to 10 times that of the bead filler,

【０００９】前記ビード補強層を、840 〜1500d/2 の繊
維コードにて形成し、そのビード補強層の半径方向内端
をビードコアの近傍部分に位置させるとともに、それの
半径方向外端を、ビードコア内周面からタイヤ断面高さ
の0.3 〜0.5 倍の位置に配置したものである。The bead reinforcing layer is formed of a fiber cord of 840 to 1500d / 2, the inner end of the bead reinforcing layer in the radial direction is located in the vicinity of the bead core, and the outer end of the bead reinforcing layer in the radial direction is the bead core. It is placed at a position 0.3 to 0.5 times the height of the tire cross section from the inner peripheral surface.

【００１０】[0010]

【作用】この発明の乗用車用空気入りタイヤでは、ビー
ド部を、ビードフィラーの他、ビード補強ゴムおよびビ
ード補強層をもって補強することにより、ロスタンジェ
ントの大きいビードフィラーの体積を十分小ならしめる
ことができ、この結果として、タイヤの転がり抵抗が有
効に低下されることになる。In the pneumatic tire for passenger cars of the present invention, the volume of the bead filler having a large loss tangent can be made sufficiently small by reinforcing the bead portion with the bead filler, the bead reinforcing rubber and the bead reinforcing layer. As a result, the rolling resistance of the tire is effectively reduced.

【００１１】ところで、ここにおいてビードフィラーの
ショアＡ硬度を75〜99度とするのは、75度未満ではタイ
ヤの横剛性が低下して操縦正が悪化し、逆に99度を越え
る値としたときは乗心地が悪化することによる。By the way, here, the Shore A hardness of the bead filler is set to 75 to 99 degrees. If it is less than 75 degrees, the lateral rigidity of the tire is lowered and the steering accuracy is deteriorated. This is due to the deterioration of riding comfort.

【００１２】また、それの半径方向高さをタイヤ断面高
さの0.14〜0.35倍とするのは、それが0.14倍未満では、
ビード補強ゴムの体積を大きくしてもなお十分なビード
部剛性を確保することができず、また、0.35倍を越える
と、ビードフィラーの高さが高くなりすぎて転がり抵抗
を十分低下させ得ないことによる。Further, the height in the radial direction thereof is set to 0.14 to 0.35 times the height of the tire cross section, when it is less than 0.14 times,
Even if the volume of the bead reinforcing rubber is increased, it is not possible to secure sufficient bead rigidity, and if it exceeds 0.35 times, the height of the bead filler becomes too high to sufficiently reduce the rolling resistance. It depends.

【００１３】またここでは、ビード補強ゴムを、カーカ
スの巻上げ部の外側に配設することによって、ビード部
の耐カット性を効果的に高めることができ、それのショ
アＡ硬度を65〜80度とすることによって、操縦安定性と
乗心地との両性能を両立させることができる。Further, here, by arranging the bead reinforcing rubber on the outside of the winding portion of the carcass, the cut resistance of the bead portion can be effectively enhanced, and the Shore A hardness thereof is 65 to 80 degrees. By so doing, both performances of steering stability and riding comfort can be made compatible.

【００１４】そして、そのビード補強ゴムの半径方向高
さを、タイヤ断面高さの0.28〜0.6倍とするとともに、
ビードフィラーの同様の高さの1.5 〜3.5 倍とすること
により、ビード部の歪エネルギーを低下させて転がり抵
抗を下げると共に、高い操縦安定性を確保することがで
きる。The height of the bead reinforcing rubber in the radial direction is set to 0.28 to 0.6 times the height of the tire cross section, and
By setting the height to be 1.5 to 3.5 times the same as that of the bead filler, the strain energy of the bead portion can be reduced to reduce the rolling resistance and high steering stability can be secured.

【００１５】さらに、ビード補強ゴムの体積をビードフ
ィラーのそれの1.5 〜10倍とすることによって、ビード
部全体の体積を従来構造のそれと大きく変えることなく
タイヤを作ることができる。Further, by setting the volume of the bead reinforcing rubber to be 1.5 to 10 times that of the bead filler, a tire can be manufactured without largely changing the volume of the entire bead portion to that of the conventional structure.

【００１６】しかも、このタイヤでは、カーカスの巻上
げ部分とビード補強ゴムとの間にビード補強層を配設す
ることにより、ビード部の横剛性を確保し、またカーカ
スを保護することが可能となる。Moreover, in this tire, by disposing the bead reinforcing layer between the rolled-up portion of the carcass and the bead reinforcing rubber, the lateral rigidity of the bead portion can be secured and the carcass can be protected. .

【００１７】また、そのビード補強層を、 840〜1500d/
2 の繊維コードで形成することによって、ビードフィラ
ーの体積を小ならしめたことによる横剛性の低下を補
い、耐カット性も良化させることができる。Further, the bead reinforcing layer is 840 to 1500 d /
By forming the fiber cord of No. 2, it is possible to compensate for the decrease in lateral rigidity due to the bead filler having a small volume and to improve the cut resistance.

【００１８】そしてさらには、ビード補強層の半径方向
内端をビードコアの近傍部分に位置させるとともに、そ
れの半径方向外端を、ビードコア内周面からタイヤ断面
高さの0.3 〜0.5 倍の位置に配置することによって、必
要十分な横剛性を確保できる。Further, the inner end of the bead reinforcing layer in the radial direction is located in the vicinity of the bead core, and the outer end of the bead reinforcing layer is located at a position 0.3 to 0.5 times the tire cross section height from the inner peripheral surface of the bead core. By arranging them, necessary and sufficient lateral rigidity can be secured.

【００１９】[0019]

【実施例】以下にこの発明の実施例を図面に基づいて説
明する。図１はこの発明の一実施例を示す、タイヤ幅方
向の略線断面図であり、図中１は一枚のカーカスプライ
からなるラジアルカーカスを、２は、そのカーカス１の
クラウン部の外周側に配設した二層のベルト層からなる
ベルトを、そして３は、ベルト２のさらに外周側に配設
したトレッド部をそれぞれ示す。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view in the tire width direction showing an embodiment of the present invention, in which 1 is a radial carcass consisting of one carcass ply, and 2 is the outer peripheral side of the crown portion of the carcass 1. A belt composed of two belt layers disposed on the belt 2 and a tread portion 3 disposed further on the outer peripheral side of the belt 2.

【００２０】ここでは、全体としてトロイド状をなすラ
ジアルカーカス１の側端部分を、ビード部４に配設した
ビードコア５の周りで内側から外側に巻上げるととも
に、ビードコア５の外周側で、ラジアルカーカスの本体
部分１ａと巻上げ部分１ｂとの間にビードフィラー６
を、また、その巻上げ部分１ｂの外側にはビード補強ゴ
ム７をそれぞれ配設し、さらに、このビード補強ゴム７
と巻上げ部分１ｂとの間にビード補強層８を配設する。Here, the side end portion of the radial toroidal carcass 1 as a whole is rolled up from the inside to the outside around the bead core 5 arranged in the bead portion 4, and the radial carcass is provided on the outer peripheral side of the bead core 5. Between the body portion 1a and the winding portion 1b of the bead filler 6
And a bead reinforcing rubber 7 is provided outside the winding portion 1b.
The bead reinforcing layer 8 is provided between the winding portion 1b and the winding portion 1b.

【００２１】ここにおいて、ビードフィラー６は、ショ
アＡ硬度が75〜99度のゴム組成物にて形成して、そのビ
ードフィラー６の、ビードコア内周面からの半径方向高
さをタイヤ断面高さＨの0.14〜0.35倍とし、また、ビー
ド補強ゴム７は、ショアＡ硬度が65〜80度のゴム組成物
にて形成して、そのビード補強ゴム７の、ビードコア内
周面からの半径方向高さを、タイヤ断面高さＨの0.28〜
0.6 倍とするとともに、ビードフィラー６の同様高さの
1.5 〜3.5 倍とし、そして、ビード補強ゴム７の体積を
ビードフィラーのそれの1.5 〜10倍とする。Here, the bead filler 6 is made of a rubber composition having a Shore A hardness of 75 to 99 degrees, and the radial height of the bead filler 6 from the inner peripheral surface of the bead core is the tire cross-section height. H is 0.14 to 0.35 times, and the bead reinforcing rubber 7 is made of a rubber composition having a Shore A hardness of 65 to 80 degrees, and the bead reinforcing rubber 7 has a height in the radial direction from the inner peripheral surface of the bead core. The tire cross-section height H of 0.28 ~
0.6 times the same height as the bead filler 6
1.5 to 3.5 times, and the volume of the bead reinforcing rubber 7 is 1.5 to 10 times that of the bead filler.

【００２２】さらに、ビード補強層８を、840 〜1500d/
2 の繊維コードにて形成し、このビード補強層８の半径
方向の内端をビードコア５の近傍部分に、そしてその外
端を、ビードコア内周面からタイヤ断面高さＨの0.3 〜
0.5 倍の高さに位置させる。Further, the bead reinforcing layer 8 is provided with 840 to 1500 d /
The inner end of the bead reinforcing layer 8 in the radial direction is in the vicinity of the bead core 5 and the outer end thereof is 0.3 to 0.3 mm in the tire cross section height H from the inner peripheral surface of the bead core.
Position 0.5 times higher.

【００２３】このように構成して成る空気入りラジアル
タイヤによれば、前述したように、操縦安定性を高く維
持して、車両の燃費を有効に向上させることができる。According to the pneumatic radial tire configured as described above, as described above, the steering stability can be maintained high and the fuel consumption of the vehicle can be effectively improved.

【００２４】図２はこの発明の他の実施例を示す略線断
面図であり、これは、ビード補強ゴム７を、タイヤ幅方
向の内外に二分割し、その内側部分７ａを、ショアＡ硬
度が65〜80度のゴム組成物にて形成して、そのビードコ
ア内周面からの半径方向高さを、タイヤ断面高さＨの0.
28〜0.6 倍とするとともに、ビードフィラー６の同様高
さの 1.5〜3.5 倍とし、そして、ビード補強ゴムの内側
部分７ａの体積をビードフィラーのそれの 1.2〜7.5 倍
とする一方、外側部分７ｂを、ショアＡ硬度が75〜99度
のゴム組成物にて形成して、そのビードコア内周面から
の半径方向高さを、タイヤ断面高さＨの0.24〜0.4 倍と
するとともに、ビードフィラー６の同様高さの 1.5〜3.
0 倍とし、そして、ビード補強ゴムの外側部分７ｂの体
積をビードフィラーのそれの 1.0〜3.5 倍としたもので
ある。FIG. 2 is a schematic line sectional view showing another embodiment of the present invention, in which a bead reinforcing rubber 7 is divided into two inside and outside in the tire width direction, and an inside portion 7a thereof is Shore A hardness. Is 65 to 80 degrees in the rubber composition, and the radial height from the inner peripheral surface of the bead core is 0.
28 to 0.6 times, 1.5 to 3.5 times the same height as the bead filler 6, and the volume of the inner portion 7a of the bead reinforcing rubber is 1.2 to 7.5 times that of the bead filler, while the outer portion 7b. Is formed of a rubber composition having a Shore A hardness of 75 to 99 degrees, and the radial height from the inner peripheral surface of the bead core is 0.24 to 0.4 times the tire cross-sectional height H, and the bead filler 6 As high as 1.5 to 3.
And the volume of the outer portion 7b of the bead reinforcing rubber was 1.0 to 3.5 times that of the bead filler.

【００２５】この例によれば、上述したところに加え、
ビード補強ゴム７の上述したような構成に基づき、操縦
安定性を高く維持し、なおかつ耐カット性においてもす
ぐれた効果をもたらすことができる。According to this example, in addition to the above,
Based on the above-described configuration of the bead reinforcing rubber 7, it is possible to maintain high steering stability and also to obtain an excellent effect in cut resistance.

【００２６】（比較例）以下に、発明タイヤと比較タイ
ヤとの転がり抵抗および横剛性に関する比較試験につい
て説明する。(Comparative Example) A comparative test regarding rolling resistance and lateral rigidity between the invention tire and the comparative tire will be described below.

【００２７】◎供試タイヤ サイズが175/70 Ｒ13のタイヤ ・発明タイヤ 図１に示す構成を有するタイヤであって、ビードフィラ
ーを、硬度90度、高さ20mm（0.2 Ｈ）とし、ビード補強
ゴムを、硬度70度、高さ55mm（0.55Ｈ）とするととも
に、その体積をビードフィラー体積の 4.5倍とし、ビー
ド補強層を、840d/2のナイロン繊維コードで形成すると
ともに、その上端の高さを45mm（0.45Ｈ）としたもの。 ・比較タイヤ 図３に示す構成を有するタイヤであって、ビードフィラ
ーを、硬度90度、高さ50mm（0.5 Ｈ）とし、ビード補強
ゴムを、硬度70度、高さ40mm（0.4 Ｈ）とするととも
に、その体積をビードフィラー体積の0.75倍とし、ビー
ド補強層を配設しないもの。◎ Test tire Size 175/70 R13 tire ・ Invention tire A tire having the structure shown in Fig. 1, in which the bead filler has a hardness of 90 degrees and a height of 20 mm (0.2 H), and a bead reinforcing rubber. Has a hardness of 70 degrees and a height of 55 mm (0.55 H), its volume is 4.5 times the bead filler volume, and the bead reinforcement layer is made of 840d / 2 nylon fiber cords and the height of its upper end is 45mm (0.45H). -Comparative tire A tire having the structure shown in Fig. 3, in which the bead filler has a hardness of 90 degrees and a height of 50 mm (0.5 H), and the bead reinforcing rubber has a hardness of 70 degrees and a height of 40 mm (0.4 H). At the same time, the volume is set to 0.75 times the bead filler volume, and the bead reinforcing layer is not provided.

【００２８】◎試験方法 転がり抵抗については、スチール平滑面を有する、外径
が1707.6mm, 幅が350mm の回転ドラムを用い、 300kgの
荷重の作用下で、０〜180km/h の速度で回転させたとき
の惰行法をもって測定して評価し、横剛性については、
表面があや目ｍ＝0.3 のローレット加工を施した鋼製の
路面においてタイヤに路面に対して直角方向に荷重をか
け、タイヤ回転軸と平行に移動する路面との相対変位量
に対して発生する力を測定して評価した。◎ Test method As for rolling resistance, a rotating drum having a steel smooth surface, an outer diameter of 1707.6 mm and a width of 350 mm was used and rotated at a speed of 0 to 180 km / h under the action of a load of 300 kg. Measured and evaluated by the coasting method when
The load is applied to the tire in the direction perpendicular to the road surface on a knurled steel road surface with a m = 0.3 grading, and it is generated with respect to the relative displacement of the road surface moving parallel to the tire rotation axis. The force was measured and evaluated.

【００２９】◎試験結果 速度80km/hにおいて、発明タイヤでは、転がり抵抗を比
較タイヤに比して約10％改善することができた。なお横
剛性は、両タイヤともにほぼ同等であった。◎ Test Results At the speed of 80 km / h, the invention tire was able to improve the rolling resistance by about 10% as compared with the comparative tire. The lateral rigidity of both tires was almost the same.

【００３０】[0030]

【発明の効果】上記比較例からも明らかなように、この
発明によれば、とくには、ビード部の構造に変更を加え
てビードフィラーの体積を有効に低減させることによっ
て、操縦安定性を十分高く維持しつつ、転がり抵抗を低
減させて車両の燃費を効果的に向上させることができ
る。As is apparent from the above comparative example, according to the present invention, the steering stability is sufficiently improved by changing the structure of the bead portion to effectively reduce the volume of the bead filler. It is possible to effectively improve the fuel efficiency of the vehicle by reducing the rolling resistance while maintaining the high value.

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

【図１】この発明の実施例を示すタイヤ幅方向の略線断
面図である。FIG. 1 is a schematic cross-sectional view in the tire width direction showing an embodiment of the present invention.

【図２】この発明の他の実施例を示すタイヤ幅方向の略
線断面図である。FIG. 2 is a schematic cross-sectional view in the tire width direction showing another embodiment of the present invention.

【図３】比較タイヤを例示するタイヤ幅方向の略線断面
図である。FIG. 3 is a schematic cross-sectional view in the tire width direction illustrating a comparative tire.

【符号の説明】[Explanation of symbols]

１ ラジアルカーカス １ａ 本体部分 １ｂ 巻上げ部分 ２ ベルト ３ トレッド ４ ビード部 ５ ビードコア ６ ビードフィラー ７ ビード補強ゴム ８ ビード補強層 Ｈ タイヤ断面高さ 1 Radial carcass 1a Body part 1b Winding part 2 Belt 3 Tread 4 Bead part 5 Bead core 6 Bead filler 7 Bead reinforcement rubber 8 Bead reinforcement layer H Tire section height

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 少なくとも一枚のカーカスプライからな
るラジアルカーカスと、このラジアルカーカスの、本体
部分と巻上げ部分との間で、ビードコアの外周側に配設
したビードフィラーと、前記巻上げ部分の外側に配設し
たビード補強ゴムと、その巻上げ部分とビード補強ゴム
との間に配設したビード補強層とを具え、 前記ビードフィラーのショアＡ硬度を75〜99度とすると
ともに、そのビードフィラーの、ビードコア内周面から
の半径方向高さを、タイヤ断面高さの0.14〜0.35倍と
し、 前記ビード補強ゴムのショアＡ硬度を65〜80度とし、こ
のビード補強ゴムの、ビードコア内周面からの半径方向
高さを、タイヤ断面高さの0.28〜0.6 倍とするととも
に、前記ビードフィラーの同様高さの1.5 〜3.5 倍と
し、また、ビード補強ゴムの体積をビードフィラーのそ
れの1.5 〜10倍とし、 前記ビード補強層を、840 〜1500d/2 の繊維コードにて
形成し、そのビード補強層の半径方向内端をビードコア
の近傍部分に位置させるとともに、それの半径方向外端
を、ビードコア内周面からタイヤ断面高さの0.3 〜0.5
倍の位置に配置してなる乗用車用空気入りラジアルタイ
ヤ。1. A radial carcass consisting of at least one carcass ply, a bead filler disposed on the outer peripheral side of the bead core between the main body portion and the winding portion of the radial carcass, and an outside of the winding portion. The bead reinforcing rubber disposed, and a bead reinforcing layer disposed between the rolled-up portion and the bead reinforcing rubber are provided, and the Shore A hardness of the bead filler is 75 to 99 degrees, and the bead filler is The radial height from the inner peripheral surface of the bead core is set to 0.14 to 0.35 times the tire cross-sectional height, the Shore A hardness of the bead reinforcing rubber is set to 65 to 80 degrees, and the bead reinforcing rubber from the inner peripheral surface of the bead core is set. The radial height should be 0.28 to 0.6 times the tire cross-section height, 1.5 to 3.5 times the same height as the bead filler, and the bead reinforcing rubber volume should be the same. The bead reinforcing layer is formed of a fiber cord of 840 to 1500d / 2, and the radial inner end of the bead reinforcing layer is positioned in the vicinity of the bead core, and From the inner peripheral surface of the bead core to the radial outer end, 0.3 to 0.5 of the tire cross-sectional height.
Pneumatic radial tires for passenger cars that are arranged in double positions.
JP16465293A 1993-07-02 1993-07-02 Pneumatic radial tires for passenger cars Expired - Fee Related JP3355222B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16465293A JP3355222B2 (en) 1993-07-02 1993-07-02 Pneumatic radial tires for passenger cars

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16465293A JP3355222B2 (en) 1993-07-02 1993-07-02 Pneumatic radial tires for passenger cars

Publications (2)

Publication Number Publication Date
JPH0717219A true JPH0717219A (en) 1995-01-20
JP3355222B2 JP3355222B2 (en) 2002-12-09

Family

ID=15797254

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16465293A Expired - Fee Related JP3355222B2 (en) 1993-07-02 1993-07-02 Pneumatic radial tires for passenger cars

Country Status (1)

Country Link
JP (1) JP3355222B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999001300A1 (en) * 1997-07-01 1999-01-14 Sumitomo Rubber Industries, Ltd. Heavy load radial tire
WO2002076767A1 (en) * 2001-03-20 2002-10-03 Kumho Tire Co., Inc. Pneumatic tire with reinforced bead part
KR100405124B1 (en) * 2001-03-20 2003-12-01 금호타이어 주식회사 Pneumatic Tire with Reinforced Bead Part
JP2010167940A (en) * 2009-01-23 2010-08-05 Bridgestone Corp Pneumatic tire for aircraft
US8118073B2 (en) * 2006-07-31 2012-02-21 Bridgestone Americas Tire Operations, Llc Tire having a carcass ply turn-up portion with a concave segment
JP2014508673A (en) * 2011-02-17 2014-04-10 コンパニー ゼネラール デ エタブリッスマン ミシュラン Improved tire with beads
JP2014136514A (en) * 2013-01-17 2014-07-28 Bridgestone Corp Pneumatic tire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583606A (en) * 1978-12-16 1980-06-24 Yokohama Rubber Co Ltd:The Radial tyre for automobile and its production
JPS60248410A (en) * 1984-05-25 1985-12-09 Yokohama Rubber Co Ltd:The Pneumatic radial tire
JPH02286406A (en) * 1989-04-26 1990-11-26 Yokohama Rubber Co Ltd:The Pneumatic radial tire
JPH0455108A (en) * 1990-06-22 1992-02-21 Yokohama Rubber Co Ltd:The Pneumatic tire for automobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583606A (en) * 1978-12-16 1980-06-24 Yokohama Rubber Co Ltd:The Radial tyre for automobile and its production
JPS60248410A (en) * 1984-05-25 1985-12-09 Yokohama Rubber Co Ltd:The Pneumatic radial tire
JPH02286406A (en) * 1989-04-26 1990-11-26 Yokohama Rubber Co Ltd:The Pneumatic radial tire
JPH0455108A (en) * 1990-06-22 1992-02-21 Yokohama Rubber Co Ltd:The Pneumatic tire for automobile

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999001300A1 (en) * 1997-07-01 1999-01-14 Sumitomo Rubber Industries, Ltd. Heavy load radial tire
US6318431B1 (en) 1997-07-01 2001-11-20 Sumitomo Rubber Industries, Ltd. Heavy load radial tire with specified carcass turnup
WO2002076767A1 (en) * 2001-03-20 2002-10-03 Kumho Tire Co., Inc. Pneumatic tire with reinforced bead part
KR100393476B1 (en) * 2001-03-20 2003-08-02 금호산업주식회사 Pneumatic Tire with Reinforced Bead Part
KR100405124B1 (en) * 2001-03-20 2003-12-01 금호타이어 주식회사 Pneumatic Tire with Reinforced Bead Part
US7225846B2 (en) 2001-03-20 2007-06-05 Kumho Tire Co., Inc. Pneumatic tire with reinforced bead part
US8118073B2 (en) * 2006-07-31 2012-02-21 Bridgestone Americas Tire Operations, Llc Tire having a carcass ply turn-up portion with a concave segment
JP2010167940A (en) * 2009-01-23 2010-08-05 Bridgestone Corp Pneumatic tire for aircraft
JP2014508673A (en) * 2011-02-17 2014-04-10 コンパニー ゼネラール デ エタブリッスマン ミシュラン Improved tire with beads
JP2014136514A (en) * 2013-01-17 2014-07-28 Bridgestone Corp Pneumatic tire

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