JP2005313735A - Pneumatic radial tire for heavy load - Google Patents

Pneumatic radial tire for heavy load Download PDF

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JP2005313735A
JP2005313735A JP2004132812A JP2004132812A JP2005313735A JP 2005313735 A JP2005313735 A JP 2005313735A JP 2004132812 A JP2004132812 A JP 2004132812A JP 2004132812 A JP2004132812 A JP 2004132812A JP 2005313735 A JP2005313735 A JP 2005313735A
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bead
rubber
height
core
ply
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JP4731831B2 (en
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Naoto Kashiwabara
直人 柏原
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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    • 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
    • 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
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic radial tire having high durability which prevents separation of ply end from being generated by moving a ply tension inflection point to a bead toe side. <P>SOLUTION: The pneumatic radial tire is locked by winding a carcass ply 1 from an inside to an outside around a bead core 3 composing of a bead wire and a lamination layer of coated rubber and a rubber filler disposed on the bead core 3. An approximately circular or an approximately elliptic core cover 3a which is composed of a hard rubber of rubber hardness 85 or more at 23°C and encloses circumference is provided on the bead core 3, the rubber filler 4 of rubber hardness 60 to 75 at 23°C is provided on the core cover 3a, and a pad 6 of rubber hardness 60 to 75 at 23°C is provided so as to hold the turnup end of the carcass ply 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ビード部の構造に特徴を有する耐久性の高い重荷重用空気入りラジアルタイヤに関するものである。   The present invention relates to a heavy-duty pneumatic radial tire having high durability and having a feature in the structure of a bead portion.

一般に、空気入りラジアルタイヤは、図６および図７に示すように、ラジアル方向のコード配列よりなる少なくとも１層のカーカスプライ１を有し、このカーカスプライ１の両端部は、両側のビード部２において、ビードコア３とその上に配されたゴムフィラー４の回りに内側から外側に巻き上げられて係止されている。また、溝９を有するトレッド部７のカーカスプライ１の外側には、複数のベルト層８が形成されている。   In general, as shown in FIGS. 6 and 7, the pneumatic radial tire has at least one layer of carcass ply 1 having a cord arrangement in the radial direction, and both ends of the carcass ply 1 have bead portions 2 on both sides. In FIG. 2, the bead core 3 and the rubber filler 4 disposed thereon are wound up and locked from the inside to the outside. A plurality of belt layers 8 are formed on the outer side of the carcass ply 1 of the tread portion 7 having the grooves 9.

カーカスプライ１両端のビード構造は、ビードワイヤと被覆ゴムの積層からなるビードコア３をカバーゴムで覆ってビードカバー３ａを形成し、その上にゴムフィラー４を配している。更にプライ巻き上げ外側には、パッド６や補強チェーファー５があるのが一般的である。   In the bead structure at both ends of the carcass ply 1, a bead cover 3a is formed by covering a bead core 3 made of a laminate of a bead wire and a covering rubber with a cover rubber, and a rubber filler 4 is disposed thereon. Further, a pad 6 and a reinforcing chafer 5 are generally provided outside the ply winding.

高内圧、高荷重で使用される重荷重空気入りタイヤは、使用過程において、ビード周りの特に内面側のカーカスプライ１の張力が高い部分に引っ張られる形で、ビードコア３が回転モーメントを受け、ビードトウ部２ａが径方向に吊上りと呼ぶ変形を起こすため、リムフランジ上のビード部が外側に大きな張り出し変形を起こす。これにより、カーカスプライ１の巻き上げ端のせん断歪が大きくなり、セパレーションやクラック等の引き起こす起因となり、ビード耐久力を悪化させる大きな要因になっていた。   In heavy duty pneumatic tires used at high internal pressure and high load, the bead core 3 receives a rotational moment in the process of use and is pulled by a portion where the tension of the carcass ply 1 around the bead is particularly high, and the bead toe Since the part 2a causes a deformation called lifting in the radial direction, the bead part on the rim flange causes a large overhanging deformation to the outside. As a result, the shear strain at the winding end of the carcass ply 1 is increased, which causes separation and cracks, and is a major factor that deteriorates the bead durability.

これを改良するため、特許文献１には、図８に示すようにゴムフィラー４を2層化（４ａと４ｂ）し、ビードコア側に高硬度ゴム４ａを配することで、ビード部２の吊上り変形を抑制する重荷重空気入りタイヤが提案されている。しかし、単に高硬度ゴムフィラーをビードコア３の上だけに適用するだけでは、プライ張力変曲点をビードトウ側に近い位置まで移動できないために効果改善代が少なかった。   In order to improve this, Patent Document 1 discloses that the rubber filler 4 is divided into two layers (4a and 4b) as shown in FIG. 8, and the high hardness rubber 4a is disposed on the bead core side, so that the bead portion 2 is suspended. A heavy-duty pneumatic tire that suppresses upward deformation has been proposed. However, simply applying a high-hardness rubber filler only on the bead core 3 has reduced the effect improvement margin because the ply tension inflection point cannot be moved to a position close to the bead toe side.

また、特許文献２には、ビードコアの周りを高いモジュラスの円形のゴム層で被覆し、更に低いモジュラスのゴム層を介在させつつ、カーカスプライを巻き返した構造を有する空気入りタイヤが開示されている。しかし、この構造は、ビードコアの型崩れをなくし、ビードコア周りの回転変形を円滑にするものであり、ビードコアの捩れ変形を抑制してタイヤの耐久性を向上させるものではない。一方、重荷重空気入りタイヤでは、ビードコア周りの回転変形は極力抑制すべきであり、ビード部はリムと嵌合するためにリム、特に、リムフランジ部との位置関係やプライ端との位置関係がビード部の耐久力向上には大変重要となってくるが、上記の構造はそれらを開示するものではない。
特開平１０−１４７１１６号公報 特開平６−２３９１１４号公報 Further, Patent Document 2 discloses a pneumatic tire having a structure in which a bead core is covered with a high modulus circular rubber layer and a carcass ply is wound while a lower modulus rubber layer is interposed. . However, this structure eliminates the deformation of the bead core and facilitates the rotational deformation around the bead core, and does not improve the durability of the tire by suppressing the torsional deformation of the bead core. On the other hand, in heavy-duty pneumatic tires, rotational deformation around the bead core should be suppressed as much as possible, and the bead portion fits with the rim, so the positional relationship with the rim, especially the rim flange and the ply end. However, although it becomes very important for the durability improvement of a bead part, said structure does not disclose them.
JP 10-147116 A JP-A-6-239114

そこで、本発明の目的は、プライ張力変曲点をビードトウ側に移動させることで、プライ端のセパレーションを生じにくくした耐久性の高い重荷重用空気入りラジアルタイヤを提供することにある。   Accordingly, an object of the present invention is to provide a heavy-duty pneumatic radial tire with high durability in which the ply tension inflection point is moved to the bead toe side and separation of the ply end is less likely to occur.

上記目的は、下記の如き本発明により達成できる。   The above object can be achieved by the present invention as described below.

即ち、本発明の重荷重用空気入りラジアルタイヤは、ビードワイヤと被覆ゴムの積層からなるビードコアおよびそのビードコアの上に配したゴムフィラーの回りに、カーカスプライを内側から外側に巻き上げて係止してなる重荷重用空気入りラジアルタイヤにおいて、前記ビードコアには、２３℃でのゴム硬度８５以上の硬質ゴムからなり、全周を包み込む略円形又は略楕円形のコアカバーを設けると共に、そのコアカバーの上に２３℃でのゴム硬度６０〜７５のゴムフィラーを設け、これと共に前記カーカスプライの巻き上げ端を挟み込むように、２３℃でのゴム硬度６０〜７５のパッドを設けてあることを特徴とする。本発明におけるゴム硬度等の物性値は、具体的には実施例に記載の測定方法で測定される値である。   That is, the heavy-duty pneumatic radial tire of the present invention is formed by winding and locking a carcass ply from the inside to the outside around a bead core composed of a laminate of a bead wire and a covering rubber and a rubber filler disposed on the bead core. In the heavy-duty pneumatic radial tire, the bead core is made of a hard rubber having a rubber hardness of 85 or more at 23 ° C., and provided with a substantially circular or substantially elliptical core cover that wraps the entire circumference, on the core cover. A rubber filler having a rubber hardness of 60 to 75 at 23 ° C. is provided, and a pad having a rubber hardness of 60 to 75 at 23 ° C. is provided so as to sandwich the winding end of the carcass ply. The physical property values such as rubber hardness in the present invention are specifically values measured by the measuring methods described in the examples.

次に本発明の作用効果について、図２（ａ）〜（ｃ）に基づいて説明する。図２の（ａ）は、タイヤのビード部周辺の各部の位置Ａ〜Ｃを示している。図２（ｂ）はタイヤが接地していない部分について、空気を入れた時（インフレート時）と更に荷重を負荷した時におけるプライ張力の分布を示している。図２（ｃ）はこれに対応するタイヤ接地部のプライ張力の分布を示している。このグラフで、「プライペリフェリ」とは、赤道面からのプライに沿った距離を指し、プライ張力は相対値で示してある（図３についても同様）。   Next, the effect of this invention is demonstrated based on Fig.2 (a)-(c). (A) of FIG. 2 has shown position AC of each part around the bead part of a tire. FIG. 2 (b) shows the distribution of the ply tension when air is introduced (during inflation) and when a load is further applied to a portion where the tire is not in contact with the ground. FIG. 2 (c) shows the ply tension distribution of the tire ground contact portion corresponding to this. In this graph, “ply periphery” indicates a distance along the ply from the equator plane, and the ply tension is indicated by a relative value (the same applies to FIG. 3).

一般的に、プライ張力分布は図２（ａ）〜（ｃ）に示すように（ＦＥＭ解析結果）、ビードコアから内面側へ斜め上方のポイントＡで最大値となり、ビードコア下のＢ部で最小値、プライ巻き上げ側のビードコア横のポイントＣで再び極大値を示す。ＡＢ間のプライ張力総和とＢＣ間のプライ張力総和には、明らかな差があり前者の方が大きくなる。このため、ビードコアは内面側への回転モーメントを受け、ビードトウ部が内面径方向に吊上げられ、リムフランジ上のビード部が外側へ張り出し変形を起こす。高内圧、高荷重下で使用されると、これらの作用により永久変形を引き起こす。   Generally, as shown in FIGS. 2A to 2C, the ply tension distribution has a maximum value at a point A diagonally upward from the bead core to the inner surface side, and a minimum value at a B portion below the bead core. The maximum value is again shown at point C next to the bead core on the ply winding side. There is a clear difference between the total ply tension between AB and the total ply tension between BC, and the former is larger. For this reason, the bead core receives a rotational moment toward the inner surface side, the bead toe portion is lifted in the radial direction of the inner surface, and the bead portion on the rim flange projects outward and causes deformation. When used under high internal pressure and high load, these actions cause permanent deformation.

本発明におけるビード構造によると、ビードコアに対し硬質ゴムからなり全周を包み込む略円形又は略楕円形のコアカバーを設けているため、ビードコアの捩れ抑制効果が高まり、図３に示すように（実施例と比較例の対比したＦＥＭ解析結果）、Ａ部のプライ張力最大値が低減しつつ、Ｂ部側へポイントが移動し、Ｂ部及びＣ部のプライ張力が増大する。そのために、ＡＢ間のプライ張力総和とＢＣ間のプライ張力総和との差が低減され、ビードコアにかかる内面側への回転モーメントが小さくなり、ビードトウの吊上り、リムフランジ上の外側張り出し変形が抑制され、結果的にプライ巻き上げ端のせん断歪が低減でき、ビード耐久力向上が実現できた。これを裏付ける解析データ（ＦＥＭ解析結果）が、図４であるが、上記の作用効果には、軟質ゴムからなるゴムフィラーとパッドの寄与するところも大きい。   According to the bead structure of the present invention, the bead core is provided with the substantially circular or substantially elliptical core cover that is made of hard rubber and wraps the entire circumference, so that the effect of suppressing the twist of the bead core is enhanced, as shown in FIG. FEM analysis results comparing the example and the comparative example), the ply tension maximum value of the A part is reduced, the point moves to the B part side, and the ply tension of the B part and the C part increases. For this reason, the difference between the total ply tension between AB and the total ply tension between BC is reduced, the rotational moment applied to the inner surface of the bead core is reduced, and the bead toe is lifted and the outer bulge deformation on the rim flange is suppressed. As a result, the shear strain at the ply-winding end can be reduced and the bead durability can be improved. The analysis data (FEM analysis result) that supports this is shown in FIG. 4, and the rubber filler made of soft rubber and the pad greatly contribute to the above-described effects.

本発明では、リム組み後の標準状態において、リムフランジの上端高さを基準とした前記コアカバーとリムとの位置関係は、前記巻き上げ端高さをＨ１、前記コアカバーの上端の高さをＨ２、コアカバー内側のプライとの接触上端の高さをＨ３、コアカバー外側のプライとの接触上端の高さをＨ４とするときに、Ｈ２≦１／２Ｈ１、且つ、Ｈ２＞Ｈ３≧Ｈ４を満足するものであることが好ましい。このような条件を満たすことにより、ビードトウの吊上りをより確実に抑制でき、プライ巻き上げ端でのせん断歪みをより低減することができる。   In the present invention, in the standard state after assembling the rim, the positional relationship between the core cover and the rim with respect to the height of the upper end of the rim flange is such that the height of the winding end is H1, and the height of the upper end of the core cover is When H2 is the height of the contact upper end with the ply inside the core cover and H3 and the height of the contact upper end with the ply outside the core cover is H4, H2 ≦ 1 / 2H1 and H2> H3 ≧ H4. It is preferable that it is satisfied. By satisfying such a condition, the lifting of the bead toe can be more reliably suppressed, and the shear strain at the ply winding-up end can be further reduced.

上記において、前記コアカバーのゴム硬度は２３℃で８５以上、且つ、動的弾性率Ｅ’は２３℃で２０Ｍｐａ以上であり、且つ、これに対し８０℃でのゴム硬度と動的弾性率Ｅ’とがそれぞれの低下率２５％以内であり、前記ゴムフィラー及びパッドの動的弾性率Ｅ’は２３℃で３〜１０Ｍｐａであることが好ましい。   In the above, the rubber hardness of the core cover is 85 or more at 23 ° C., and the dynamic elastic modulus E ′ is 20 Mpa or more at 23 ° C., and the rubber hardness and dynamic elastic modulus E at 80 ° C. It is preferable that “and” be within a reduction rate of 25%, and the dynamic elastic modulus E ′ of the rubber filler and the pad is 3 to 10 MPa at 23 ° C.

この構成によると、実際の走行状態においても、コアカバーのゴム硬度や動的弾性率Ｅ’が高温でも十分維持されるため、上記の作用によって、プライ端のセパレーションをより生じにくくすることができる。その際、ゴム硬度だけでなく動的弾性率Ｅ’によって各部の物性が規定されていることも重要である。   According to this configuration, the rubber hardness and the dynamic elastic modulus E ′ of the core cover are sufficiently maintained even at high temperatures even in an actual running state, so that the separation of the ply end can be made less likely to occur due to the above-described action. . At that time, it is also important that the physical properties of each part are defined not only by the rubber hardness but also by the dynamic elastic modulus E ′.

また、前記高さＨ２の規定位置から前記高さＨ３規定位置までの水平幅をＷ１、前記高さＨ２の規定位置から前記高さＨ４規定位置までの水平幅をＷ２とするとき、Ｗ１＜Ｗ２を満たすことが好ましい。これによって、プライ張力変曲点をビードトウ側により効果的に移動させることができる。   When the horizontal width from the specified position of the height H2 to the specified position of the height H3 is W1, and the horizontal width from the specified position of the height H2 to the specified position of the height H4 is W2, W1 <W2 It is preferable to satisfy. Thereby, the ply tension inflection point can be effectively moved to the bead toe side.

以下、本発明の実施の形態について、図面を参照しながら説明する。図１は、本発明の重荷重用空気入りラジアルタイヤの一例を示す要部断面図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part showing an example of a heavy duty pneumatic radial tire of the present invention.

本発明の重荷重用空気入りラジアルタイヤは、図１に示すように、スチールコードや高強度有機繊維コード等をタイヤラジアル方向に配列した１層又は複数層のプライよりなるカーカス１を備える。ビードワイヤと被覆ゴムの積層からなるビードコア３およびそのビードコア３の上に配したゴムフィラー４の回りに、カーカスプライ１を内側から外側に巻き上げて係止してある。ビードコア３は、例えば被覆ゴムを有するビードワイヤが、順次積層巻回されて集合体をなしている。   As shown in FIG. 1, the heavy-duty pneumatic radial tire of the present invention includes a carcass 1 made of one or more plies in which steel cords, high-strength organic fiber cords, and the like are arranged in the tire radial direction. A carcass ply 1 is wound up from the inside to the outside and locked around a bead core 3 made of a laminate of a bead wire and a covering rubber and a rubber filler 4 disposed on the bead core 3. For example, the bead core 3 is formed by sequentially laminating and winding bead wires having coated rubber.

ビードコア３には、その全周を包み込む略円形又は略楕円形のコアカバー３ａを設けてある。コアカバー３ａは２３℃でのゴム硬度（ＪＩＳ Ｋ６３０１の規定による硬度、以下同じ）が８５以上の硬質ゴムからなり、この硬質ゴムは、好ましくは硬度９０以上である。硬質ゴムの硬度が８５未満では、ビードコア３の捩れ抑制効果が不十分になる。   The bead core 3 is provided with a substantially circular or elliptical core cover 3a that wraps around the entire circumference. The core cover 3a is made of a hard rubber having a rubber hardness at 23 ° C. (hardness according to JIS K6301; the same shall apply hereinafter) of 85 or more, and this hard rubber preferably has a hardness of 90 or more. If the hardness of the hard rubber is less than 85, the twist suppressing effect of the bead core 3 is insufficient.

本発明では、コアカバー３ａのゴム硬度は２３℃で８５以上、且つ、動的弾性率Ｅ’は２３℃で２０Ｍｐａ以上であり、且つ、これに対し８０℃でのゴム硬度と動的弾性率Ｅ’とがそれぞれの低下率２５％以内であるのが好ましい。それぞれの低下率が２５％を超えると、実際の走行状態において、コアカバー３ａのゴム硬度や動的弾性率Ｅ’が高温で低下するため、ビードトゥの吊り上がり、リムフランジ上の張力変形を抑制しきれないため、プライ巻き上げ端１ａのせん断力を低減できない傾向がある。   In the present invention, the rubber hardness of the core cover 3a is 85 or more at 23 ° C., and the dynamic elastic modulus E ′ is 20 Mpa or more at 23 ° C., whereas the rubber hardness and dynamic elastic modulus at 80 ° C. E ′ is preferably within 25% of each reduction rate. If each reduction rate exceeds 25%, the rubber hardness and dynamic elastic modulus E ′ of the core cover 3a will decrease at high temperatures in the actual running state, so that bead toe lifting and tension deformation on the rim flange are suppressed. There is a tendency that the shearing force of the ply-winding end 1a cannot be reduced because it cannot be exhausted.

コアカバー３ａの上には、２３℃でのゴム硬度６０〜７５のゴムフィラー４を設けており、ゴムフィラー４は、好ましくは硬度６０〜７０である。ゴムフィラー４の硬度が６０未満であると、ビード部２全体の剛性が低下して本来の機能が発現しにくくなり、ゴムフィラー４の硬度が７５を超えると、プライ巻き上げ端１ａへの応力集中が大きくなる傾向がある。同様の理由から、ゴムフィラー４の動的弾性率Ｅ’は２３℃で３〜１０Ｍｐａであることが好ましい。   A rubber filler 4 having a rubber hardness of 60 to 75 at 23 ° C. is provided on the core cover 3a, and the rubber filler 4 preferably has a hardness of 60 to 70. When the hardness of the rubber filler 4 is less than 60, the rigidity of the entire bead portion 2 is lowered and the original function is hardly exhibited. When the hardness of the rubber filler 4 exceeds 75, the stress concentration on the ply-winding end 1a Tend to be larger. For the same reason, the dynamic elastic modulus E ′ of the rubber filler 4 is preferably 3 to 10 MPa at 23 ° C.

ゴムフィラー４はタイヤ半径方向に伸びる断面略変形三角形状（但し底辺は円弧状）をなしている。カーカスプライ１の巻き上げ端１ａは、ゴムフィラー４の斜辺の中腹部に位置するのが好ましい。   The rubber filler 4 has a substantially deformed triangular cross section extending in the tire radial direction (however, the base is arcuate). The winding end 1 a of the carcass ply 1 is preferably located in the middle of the oblique side of the rubber filler 4.

更に、ゴムフィラー４と共にカーカスプライ１の巻き上げ端１ａを挟み込むように、２３℃でのゴム硬度６０〜７５のパッド６を設けてある。パッド６はゴムフィラー４と同種のゴム材料を用いるのが好ましい。カーカスプライ１の巻き上げ端１ａで硬度の差の有るゴム材料を用いると、セパレーションの起点になる恐れが有るからである。従って、パッド６の動的弾性率Ｅ’も２３℃で３〜１０Ｍｐａであることが好ましい。   Further, a pad 6 having a rubber hardness of 60 to 75 at 23 ° C. is provided so as to sandwich the winding end 1 a of the carcass ply 1 together with the rubber filler 4. The pad 6 is preferably made of the same rubber material as the rubber filler 4. This is because if a rubber material having a difference in hardness is used at the rolled-up end 1a of the carcass ply 1, there is a possibility that it becomes a starting point of separation. Therefore, the dynamic elastic modulus E ′ of the pad 6 is also preferably 3 to 10 MPa at 23 ° C.

ビードコア３を形成するビードワイヤの被覆ゴムは、積層できる最低限に体積を少なくするのが好ましい。これによって、コンパクトなビードコアとし、その剛性を高くすることで、上記コアカバー３ａとの組み合わせによる効果が更に大きくなる。   The bead wire covering rubber forming the bead core 3 preferably has a minimum volume that can be laminated. Thus, the effect of the combination with the core cover 3a is further increased by forming a compact bead core and increasing its rigidity.

ビードコア３は、通常、断面円形のビードワイヤを最密に充填して、その集合体の断面形状を六角形にしている。これよって、断面形状の外力による変形を防止している。また、六角形のビードコア３の底辺がリム１０と略平行になるように、ビードコア３を配置している。   The bead core 3 is normally filled with a bead wire having a circular cross section in a close-packed manner, and the cross-sectional shape of the aggregate is a hexagon. This prevents the cross-sectional shape from being deformed by an external force. Further, the bead core 3 is arranged so that the bottom side of the hexagonal bead core 3 is substantially parallel to the rim 10.

カーカスプライ１の巻き上げ底部の外面には、スチールコードまたは有機繊維コードを有するチェーファーと称するビード部補強層５が設けられている。図示した例では、ビード部補強層５が有機繊維コードを有する２枚の補強層からなる場合を示している。また、パッド６の下側が、カーカスプライ１の巻き上げ部とビード部補強層５との間に入り込んだ構造となっている。   A bead portion reinforcing layer 5 called a chafer having a steel cord or an organic fiber cord is provided on the outer surface of the rolled-up bottom portion of the carcass ply 1. In the illustrated example, the case where the bead portion reinforcing layer 5 is composed of two reinforcing layers having organic fiber cords is shown. Further, the lower side of the pad 6 has a structure in which it enters between the rolled-up portion of the carcass ply 1 and the bead portion reinforcing layer 5.

本発明では、リム組み後の標準状態において、リムフランジ１０ａの上端高さを基準としたコアカバー３ａとリム１０との位置関係は、巻き上げ端高さをＨ１、コアカバー３ａの上端の高さをＨ２、コアカバー３ａ内側のプライ１との接触上端の高さをＨ３、コアカバー３ａ外側のプライ１との接触上端の高さをＨ４とするときに、Ｈ２≦１／２Ｈ１、且つ、Ｈ２＞Ｈ３≧Ｈ４を満足することが好ましい。図１に示すビード構造は、高さＨ２が高さＨ１の約半分の例を示しており、コアカバー３ａは略円形に近い断面形状である。   In the present invention, in the standard state after assembling the rim, the positional relationship between the core cover 3a and the rim 10 with respect to the height of the upper end of the rim flange 10a is as follows. Is H2, the height of the contact upper end with the ply 1 inside the core cover 3a is H3, and the height of the contact upper end with the ply 1 outside the core cover 3a is H4, H2 ≦ 1 / 2H1 and H2 It is preferable that> H3 ≧ H4 is satisfied. The bead structure shown in FIG. 1 shows an example in which the height H2 is about half of the height H1, and the core cover 3a has a cross-sectional shape close to a substantially circular shape.

Ｈ２≦１／２Ｈ１を満足しないと、プライ巻き上げ端１ａのせん断歪逆に大きくなり、セパレーションを引き起こす可能性が大きくなる傾向があり、Ｈ２＞Ｈ３≧Ｈ４を満足しないと、プライ張力変曲点をビードコア側へ移動できないため、ビード吊り上がりを抑制できない傾向がある。   If H2 ≦ 1 / 2H1 is not satisfied, the shear strain of the ply-winding end 1a increases and the possibility of causing separation tends to increase. If H2> H3 ≧ H4 is not satisfied, the ply tension inflection point is increased. Since it cannot move to the bead core side, there is a tendency that bead lifting cannot be suppressed.

また、高さＨ２の規定位置から高さＨ３規定位置までの水平幅をＷ１、高さＨ２の規定位置から高さＨ４規定位置までの水平幅をＷ２とするとき、Ｗ１＜Ｗ２を満たすことが好ましい。Ｗ１＜Ｗ２を満足しないと、プライ張力変曲点をビードコア側へ移動できないため、ビード吊り上がりを抑制できない傾向がある。   Further, when the horizontal width from the specified position of the height H2 to the specified position of the height H3 is W1, and the horizontal width from the specified position of the height H2 to the specified position of the height H4 is W2, W1 <W2 is satisfied. preferable. If W1 <W2 is not satisfied, the ply tension inflection point cannot be moved to the bead core side, so that there is a tendency that bead lifting cannot be suppressed.

本発明の重荷重用空気入りラジアルタイヤは、ビード部回りの構造以外は、従来公知のタイヤと同じであり、まず、図６に示すものと同様である。タイヤトレッド部７のカーカスプライ１の外側には、従来同様に１層もしくは複数層のベルト層８が配され、さら必要に応じてベルト補強層が配され、さらにその外側のトレッドゴムによるタイヤ外周面に、タイヤ周方向に複数本の主溝９を有するトレッドパターンが形成される。カーカスプライ１の内側には、通常、インナーライナーが設けられ、外側にはサイドウォールゴムが設けられる。   The heavy-duty pneumatic radial tire of the present invention is the same as the conventionally known tire except for the structure around the bead portion, and is the same as that shown in FIG. One or more belt layers 8 are arranged on the outer side of the carcass ply 1 of the tire tread portion 7 as in the prior art, and further a belt reinforcing layer is arranged if necessary. A tread pattern having a plurality of main grooves 9 in the tire circumferential direction is formed on the surface. An inner liner is usually provided on the inner side of the carcass ply 1, and sidewall rubber is provided on the outer side.

重荷重用空気入りタイヤは、トラック、バスなどの比較的車両総重量が重い車両に使用されるものである。   Heavy duty pneumatic tires are used for vehicles with relatively heavy gross vehicle weight such as trucks and buses.

［他の実施形態］
（１）前述の実施形態では、高さＨ２が高さＨ１の約半分の例（図５（ｂ））を示したが、図５（ａ）や図５（ｃ）のように、本発明では、高さＨ２と高さＨ１との関係を変化させることも可能である。これに伴って、コアカバー３ａは楕円形に近いものとなり、図５（ｂ）ではＨ２＞Ｈ３≧Ｈ４を満足していたのが、図５（ｃ）のようにＨ２＞Ｈ４≧Ｈ３となる場合がある。 [Other Embodiments]
(1) In the above-described embodiment, the example in which the height H2 is about half of the height H1 (FIG. 5B) is shown. However, as shown in FIG. 5A and FIG. Then, it is possible to change the relationship between the height H2 and the height H1. Along with this, the core cover 3a becomes nearly elliptical, and H2> H3 ≧ H4 in FIG. 5B satisfies H2> H4 ≧ H3 as shown in FIG. 5C. There is a case.

（２）前述の実施形態では、コアカバーの断面形状が円弧又は曲線からなる例を示したが、本発明では、コアカバーの断面形状が、単数又は複数の直線を含むものであってもよく、これらも本発明にいう略円形又は略楕円形のコアカバーに包含される。   (2) In the above-described embodiment, an example in which the cross-sectional shape of the core cover is an arc or a curve has been shown. However, in the present invention, the cross-sectional shape of the core cover may include a single or a plurality of straight lines. These are also included in the substantially circular or elliptical core cover according to the present invention.

（３）前述の実施形態では、断面円形のビードワイヤを最密に充填して断面形状が六角形のビードコアを用いる例を示したが、本発明では、ビードコアの形状を断面が様々な多角形などにしてもよい。その場合、断面が様々な多角形のビードワイヤを用いることが可能である。   (3) In the above-described embodiment, an example in which a bead core having a circular cross section is closely packed and a hexagonal bead core is used has been described. However, in the present invention, the bead core has a polygonal shape having various cross sections. It may be. In that case, it is possible to use polygonal bead wires having various cross sections.

以下、本発明の構成と効果を具体的に示す実施例等について説明する。なお、実施例等における評価項目は下記のようにして測定を行った。   Examples and the like specifically showing the configuration and effects of the present invention will be described below. In addition, the evaluation item in an Example etc. measured as follows.

（硬度）
ＪＩＳ Ｋ６２５３のタイプＡデュロメータ硬さ試験に準じて測定した。 (hardness)
Measured according to JIS K6253 type A durometer hardness test.

（動的弾性率）
１５０℃で３０分間加硫した後、幅５ｍｍ、厚さ１ｍｍ、長さ２０ｍｍの試料を作製し、スペクトロメータを用いて、初期歪５％、動的歪±１％、周波数５０Ｈｚ、温度２３℃と８０℃の条件で測定した。 (Dynamic elastic modulus)
After vulcanization at 150 ° C. for 30 minutes, a sample having a width of 5 mm, a thickness of 1 mm, and a length of 20 mm was prepared, and using a spectrometer, an initial strain of 5%, a dynamic strain of ± 1%, a frequency of 50 Hz, and a temperature of 23 ° C. And 80 ° C.

（１）ビード耐久性テスト
重荷重耐久力テストとして、タイヤ内圧を９００ｋＰａ、荷重２１０％（重荷重条件）、２５ｋｍ／ｈにて故障までの走行し、その走行距離と故障モードを評価した。 (1) Bead endurance test As a heavy load endurance test, the vehicle traveled to a failure at a tire internal pressure of 900 kPa, a load of 210% (heavy load condition) and 25 km / h, and the travel distance and failure mode were evaluated.

（２）ビード部発熱温度
前記（１）と同じテスト条件で、５時間走行後、ビード部温度を測定した。測定個所は、カーカスプライの巻上げ端からカーカスラインに直交する線上のカーカスプライの背面とした。 (2) Bead part exothermic temperature The bead part temperature was measured after driving | running | working for 5 hours on the same test conditions as said (1). The measurement location was the back surface of the carcass ply on a line perpendicular to the carcass line from the winding end of the carcass ply.

（３）ビードトウ吊り上り量
新品時の断面状態と、ビード耐久性テスト終了後の断面状態とを比較して、ビードベースからビードトウまでの平行距離を吊り上り量とした。 (3) Bead toe lifting amount The cross-sectional state at the time of a new article and the sectional state after completion of the bead durability test were compared, and the parallel distance from the bead base to the bead toe was defined as the lifting amount.

比較例１（従来ビード構造）
図７に示すビード構造において、ナイロンコードのビード部補強層とし、ゴムフィラーが硬度７０の単一ゴムよりなる従来ビード構造を有する重荷重用空気入りラジアルタイヤ（サイズ１１Ｒ２２．５ １４ＰＲ）を準備し、上記の評価を行った。実施例および比較例の各タイヤは、ベルト構造等のビード部を除く他の構造については全て同じ条件とした。 Comparative Example 1 (conventional bead structure)
In the bead structure shown in FIG. 7, a heavy-duty pneumatic radial tire (size 11R22.5 14PR) having a conventional bead structure made of a single rubber having a hardness of 70 is prepared as a bead portion reinforcement layer of nylon cord, The above evaluation was performed. The tires of the examples and comparative examples all have the same conditions for the structures other than the bead part such as a belt structure.

比較例２（２層ビードフィラー構造）
図７に示すビード構造において、ナイロンコードのビード部補強層とし、ゴムフィラーの硬度を軟質７０および硬質９０、硬質ゴムフィラーの割合を３１％、硬質ゴムフィラーと軟質ゴムフィラーとの内側の界面点をコアカバー内側のプライとの接触上端から７．５ｍｍとし、硬質ゴムフィラーと軟質ゴムフィラーとの外側の界面点をリムフランジ上端から高さ５ｍｍとした、重荷重用空気入りラジアルタイヤ（サイズ１１Ｒ２２．５ １４ＰＲ）を準備し、上記の評価を行った。 Comparative Example 2 (two-layer bead filler structure)
In the bead structure shown in FIG. 7, the bead portion reinforcing layer of the nylon cord, the hardness of the rubber filler is soft 70 and hard 90, the ratio of the hard rubber filler is 31%, and the inner interface point between the hard rubber filler and the soft rubber filler Is a heavy-duty pneumatic radial tire (size 11R22.) Having a height of 7.5 mm from the upper end of contact with the ply inside the core cover and an outer interface point between the hard rubber filler and the soft rubber filler being 5 mm from the upper end of the rim flange. 5 14PR) was prepared and evaluated as described above.

実施例１
図１に示すビード構造において、ナイロンコードのビード部補強層とし、コアカバーの硬度（２３℃）を９０、硬度（８０℃）を８５、動的弾性率Ｅ’（２３℃）を２５Ｍｐａ、動的弾性率Ｅ’（８０℃）を２２Ｍｐａとし、ゴムフィラーの硬度（２３℃）を６５、動的弾性率Ｅ’（２３℃）を７Ｍｐａとし、パッドの硬度（２３℃）を６５、動的弾性率Ｅ’（２３℃）を７Ｍｐａとし、高さＨ１を２２ｍｍ、高さＨ２を１１ｍｍ、高さＨ３を６ｍｍ、高さＨ４を４ｍｍ、水平幅Ｗ１を８ｍｍ、水平幅Ｗ２を１０ｍｍとした、重荷重用空気入りラジアルタイヤ（サイズ１１Ｒ２２．５ １４ＰＲ）を作製し、上記の評価を行った。 Example 1
In the bead structure shown in FIG. 1, a nylon cord bead portion reinforcing layer is used, the core cover has a hardness (23 ° C.) of 90, a hardness (80 ° C.) of 85, a dynamic elastic modulus E ′ (23 ° C.) of 25 MPa. The elastic modulus E ′ (80 ° C.) is 22 Mpa, the rubber filler hardness (23 ° C.) is 65, the dynamic elastic modulus E ′ (23 ° C.) is 7 Mpa, the pad hardness (23 ° C.) is 65, dynamic. The elastic modulus E ′ (23 ° C.) was 7 Mpa, the height H1 was 22 mm, the height H2 was 11 mm, the height H3 was 6 mm, the height H4 was 4 mm, the horizontal width W1 was 8 mm, and the horizontal width W2 was 10 mm. A heavy-duty pneumatic radial tire (size 11R22.5 14PR) was produced and evaluated as described above.

以上の結果を表１に示す。   The results are shown in Table 1.

Figure 2005313735
表１の結果が示すように、実施例１では比較例１（従来品）と比較して、ビードトウ吊り上り量が小さく、ビード部の発熱も改善され、耐久性も大幅に改善された。これに対して、２層ビードフィラー構造を有する比較例２では、ビード部の発熱は改善されるものの、ビードトウ吊り上り量が大きく、耐久性は不十分となった。
Figure 2005313735
 As shown in the results of Table 1, in Example 1, the amount of bead toe lifted was small, the heat generation at the bead portion was improved, and the durability was greatly improved as compared with Comparative Example 1 (conventional product). On the other hand, in Comparative Example 2 having a two-layer bead filler structure, although heat generation in the bead portion was improved, the amount of bead toe lifted was large, and durability was insufficient.

参考例１
実施例１において、図５（ａ）に示すように、コアカバーの上端高さＨ２をより小さくして、高さＨ２を５．５ｍｍ、高さＨ３を３ｍｍ、高さＨ４を２ｍｍ、水平幅Ｗ１を８ｍｍ、水平幅Ｗ２を１０ｍｍとしたこと以外は、実施例１同様にして重荷重用空気入りラジアルタイヤを作製し、上記の評価を行った。その結果、ビードトウ吊り上り量は２．０ｍｍとなり、実施例１の結果と比較して、プライ巻き上げ端でのせん断歪が５％低下し、ビード部の発熱は５℃程度上昇し、耐久性は悪化する方向であった。 Reference example 1
In Example 1, as shown in FIG. 5A, the upper end height H2 of the core cover is made smaller, the height H2 is 5.5 mm, the height H3 is 3 mm, the height H4 is 2 mm, and the horizontal width. Except that W1 was set to 8 mm and the horizontal width W2 was set to 10 mm, a heavy-duty pneumatic radial tire was produced in the same manner as in Example 1, and the above evaluation was performed. As a result, the lifting amount of the bead toe is 2.0 mm, and compared with the result of Example 1, the shear strain at the ply winding end is reduced by 5%, the heat generation at the bead part is increased by about 5 ° C., and the durability is It was in the direction of getting worse.

参考例２
実施例１において、図５（ｃ）に示すように、コアカバーの上端高さＨ２をより大きくして、高さＨ２を２２ｍｍ、高さＨ３を１８ｍｍ、高さＨ４を１６ｍｍ、水平幅Ｗ１を６ｍｍ、水平幅Ｗ２を６ｍｍとしたこと以外は、実施例１同様にして重荷重用空気入りラジアルタイヤを作製し、上記の評価を行った。その結果、ビードトウ吊り上り量は０．９ｍｍとなり、実施例１の結果と比較して、プライ巻き上げ端でのせん断歪が３５％上昇し、ビード部の発熱は同等であるが、耐久性は悪化する方向であった。 Reference example 2
In the first embodiment, as shown in FIG. 5C, the upper end height H2 of the core cover is increased, the height H2 is 22 mm, the height H3 is 18 mm, the height H4 is 16 mm, and the horizontal width W1 is set. A heavy-duty pneumatic radial tire was produced in the same manner as in Example 1 except that the horizontal width W2 was 6 mm, and the above evaluation was performed. As a result, the lifting amount of the bead toe is 0.9 mm, and compared with the result of Example 1, the shear strain at the ply winding end is increased by 35%, and the heat generation at the bead part is equivalent, but the durability is deteriorated. It was a direction to do.

本発明の重荷重用空気入りラジアルタイヤの一例を示す要部断面図Cross-sectional view of relevant parts showing an example of a heavy-duty pneumatic radial tire of the present invention 本発明の課題を説明するための各部のプライ張力を示すグラフThe graph which shows the ply tension | tensile_strength of each part for demonstrating the subject of this invention 本発明の作用効果を説明するための各部のプライ張力を示すグラフThe graph which shows the ply tension | tensile_strength of each part for demonstrating the effect of this invention 本発明の作用効果を説明するための要部説明図Main part explanatory drawing for demonstrating the effect of this invention 本発明の重荷重用空気入りラジアルタイヤの他の例を示す要部断面図Sectional drawing of the principal part which shows the other example of the pneumatic radial tire for heavy loads of this invention 本発明の重荷重用空気入りラジアルタイヤの一例を示す子午線断面図A meridian cross-sectional view showing an example of a heavy-duty pneumatic radial tire of the present invention 従来の重荷重用空気入りラジアルタイヤの一例を示す要部断面図Cross-sectional view of relevant parts showing an example of a conventional heavy-duty pneumatic radial tire 従来の重荷重用空気入りラジアルタイヤの他の例を示す要部断面図Cross-sectional view of relevant parts showing another example of a conventional heavy-duty pneumatic radial tire

符号の説明Explanation of symbols

１ カーカスプライ
２ ビード部
３ ビードコア
３ａ コアカバー
４ ゴムフィラー
６ パッド
１０ リム
１１ リムフランジ DESCRIPTION OF SYMBOLS 1 Carcass ply 2 Bead part 3 Bead core 3a Core cover 4 Rubber filler 6 Pad 10 Rim 11 Rim flange

Claims (4)

ビードワイヤと被覆ゴムの積層からなるビードコアおよびそのビードコアの上に配したゴムフィラーの回りに、カーカスプライを内側から外側に巻き上げて係止してなる重荷重用空気入りラジアルタイヤにおいて、
前記ビードコアには、２３℃でのゴム硬度８５以上の硬質ゴムからなり、全周を包み込む略円形又は略楕円形のコアカバーを設けると共に、そのコアカバーの上に２３℃でのゴム硬度６０〜７５のゴムフィラーを設け、これと共に前記カーカスプライの巻き上げ端を挟み込むように、２３℃でのゴム硬度６０〜７５のパッドを設けてあることを特徴とする重荷重用空気入りラジアルタイヤ。 In a heavy-duty pneumatic radial tire in which a carcass ply is wound from the inside to the outside and locked around a bead core made of a laminate of a bead wire and a covering rubber and a rubber filler disposed on the bead core.
The bead core is made of a hard rubber having a rubber hardness of 85 or more at 23 ° C., and is provided with a substantially circular or substantially elliptical core cover that wraps the entire circumference, and has a rubber hardness of 60 to 23 at 23 ° C. on the core cover. A heavy-duty pneumatic radial tire characterized in that 75 rubber fillers are provided and pads with rubber hardness of 60 to 75 at 23 ° C. are provided so as to sandwich the rolled-up end of the carcass ply. リム組み後の標準状態において、リムフランジの上端高さを基準とした前記コアカバーとリムとの位置関係は、前記巻き上げ端高さをＨ１、前記コアカバーの上端の高さをＨ２、コアカバー内側のプライとの接触上端の高さをＨ３、コアカバー外側のプライとの接触上端の高さをＨ４とするときに、Ｈ２≦１／２Ｈ１、且つ、Ｈ２＞Ｈ３≧Ｈ４を満足するものである請求項１記載の重荷重用空気入りラジアルタイヤ。   In the standard state after assembling the rim, the positional relationship between the core cover and the rim with respect to the height of the upper end of the rim flange is as follows: the height of the winding end is H1, the height of the upper end of the core cover is H2, and the core cover When the height of the contact upper end with the inner ply is H3 and the height of the contact upper end with the core ply is H4, H2 ≦ 1 / 2H1 and H2> H3 ≧ H4 are satisfied. The heavy-duty pneumatic radial tire according to claim 1. 前記コアカバーのゴム硬度は２３℃で８５以上、且つ、動的弾性率Ｅ’は２３℃で２０Ｍｐａ以上であり、且つ、これに対し８０℃でのゴム硬度と動的弾性率Ｅ’とがそれぞれの低下率２５％以内であり、前記ゴムフィラー及びパッドの動的弾性率Ｅ’は２３℃で３〜１０Ｍｐａである請求項１又は２に記載の重荷重用空気入りラジアルタイヤ。   The rubber hardness of the core cover is 85 or more at 23 ° C. and the dynamic elastic modulus E ′ is 20 Mpa or more at 23 ° C., and the rubber hardness and dynamic elastic modulus E ′ at 80 ° C. 3. The heavy-duty pneumatic radial tire according to claim 1, wherein the rate of decrease is within 25%, and the dynamic elastic modulus E ′ of the rubber filler and the pad is 3 to 10 MPa at 23 ° C. 4. 前記高さＨ２の規定位置から前記高さＨ３規定位置までの水平幅をＷ１、前記高さＨ２の規定位置から前記高さＨ４規定位置までの水平幅をＷ２とするとき、Ｗ１＜Ｗ２を満たす請求項２に記載の重荷重用空気入りラジアルタイヤ。   When the horizontal width from the specified position of the height H2 to the specified position of the height H3 is W1, and the horizontal width from the specified position of the height H2 to the specified position of the height H4 is W2, W1 <W2 is satisfied. The heavy-duty pneumatic radial tire according to claim 2.
JP2004132812A 2004-04-28 2004-04-28 Heavy duty pneumatic radial tire Expired - Lifetime JP4731831B2 (en)

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WO2008143288A1 (en) * 2007-05-21 2008-11-27 Bridgestone Corporation Pneumatic tire
JP2010274858A (en) * 2009-05-29 2010-12-09 Bridgestone Corp Pneumatic tire
CN102825984A (en) * 2011-06-15 2012-12-19 东洋橡胶工业株式会社 Pneumatic radial tire
CN103009932A (en) * 2012-12-18 2013-04-03 中橡集团曙光橡胶工业研究设计院 Meridian aircraft tire capable of reducing interface shear stress and improving bead durability
JP2013154486A (en) * 2012-01-27 2013-08-15 Bridgestone Corp Method and apparatus for producing bead member for tire and bead member for tire
CN107933200A (en) * 2017-12-19 2018-04-20 中策橡胶集团有限公司 A kind of reinforcement wire loop structure of individual layer carcass without interior tire
CN111070977A (en) * 2018-10-22 2020-04-28 住友橡胶工业株式会社 Heavy duty pneumatic tire
CN111070976A (en) * 2018-10-22 2020-04-28 住友橡胶工业株式会社 Heavy load pneumatic tire
JP2020066244A (en) * 2018-10-22 2020-04-30 住友ゴム工業株式会社 Pneumatic tire for heavy load
JP2020066243A (en) * 2018-10-22 2020-04-30 住友ゴム工業株式会社 Pneumatic tire for heavy load
EP4098461A1 (en) * 2021-06-03 2022-12-07 Sumitomo Rubber Industries, Ltd. Pneumatic tyre
EP4116112A1 (en) * 2021-07-07 2023-01-11 Sumitomo Rubber Industries, Ltd. Heavy duty tire

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JPH0354007A (en) * 1989-07-24 1991-03-08 Yokohama Rubber Co Ltd:The Pneumatic radial tire of heavy load
JP2002274127A (en) * 2001-03-19 2002-09-25 Bridgestone Corp Pneumatic radial tire

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JP2002274127A (en) * 2001-03-19 2002-09-25 Bridgestone Corp Pneumatic radial tire

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WO2008143288A1 (en) * 2007-05-21 2008-11-27 Bridgestone Corporation Pneumatic tire
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JP2010274858A (en) * 2009-05-29 2010-12-09 Bridgestone Corp Pneumatic tire
CN102825984A (en) * 2011-06-15 2012-12-19 东洋橡胶工业株式会社 Pneumatic radial tire
JP2013001223A (en) * 2011-06-15 2013-01-07 Toyo Tire & Rubber Co Ltd Pneumatic radial tire
US8905102B2 (en) 2011-06-15 2014-12-09 Toyo Tire & Rubber Co., Ltd. Pneumatic radial tire with round crosssection lower filler surrounding bead core
CN102825984B (en) * 2011-06-15 2015-07-08 东洋橡胶工业株式会社 Pneumatic radial tire
JP2013154486A (en) * 2012-01-27 2013-08-15 Bridgestone Corp Method and apparatus for producing bead member for tire and bead member for tire
CN103009932A (en) * 2012-12-18 2013-04-03 中橡集团曙光橡胶工业研究设计院 Meridian aircraft tire capable of reducing interface shear stress and improving bead durability
CN103009932B (en) * 2012-12-18 2015-11-18 中橡集团曙光橡胶工业研究设计院 The meridian aviation tyre that interfacial sheat stress improves bead durability can be reduced
CN107933200A (en) * 2017-12-19 2018-04-20 中策橡胶集团有限公司 A kind of reinforcement wire loop structure of individual layer carcass without interior tire
CN111070977A (en) * 2018-10-22 2020-04-28 住友橡胶工业株式会社 Heavy duty pneumatic tire
CN111070976A (en) * 2018-10-22 2020-04-28 住友橡胶工业株式会社 Heavy load pneumatic tire
JP2020066244A (en) * 2018-10-22 2020-04-30 住友ゴム工業株式会社 Pneumatic tire for heavy load
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JP2020066243A (en) * 2018-10-22 2020-04-30 住友ゴム工業株式会社 Pneumatic tire for heavy load
US11400767B2 (en) 2018-10-22 2022-08-02 Sumitomo Rubber Industries, Ltd. Heavy duty pneumatic tire
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JP7183689B2 (en) 2018-10-22 2022-12-06 住友ゴム工業株式会社 Heavy duty pneumatic tire
JP7225669B2 (en) 2018-10-22 2023-02-21 住友ゴム工業株式会社 Heavy duty pneumatic tire
CN111070976B (en) * 2018-10-22 2023-05-05 住友橡胶工业株式会社 Heavy load pneumatic tire
EP4098461A1 (en) * 2021-06-03 2022-12-07 Sumitomo Rubber Industries, Ltd. Pneumatic tyre
EP4116112A1 (en) * 2021-07-07 2023-01-11 Sumitomo Rubber Industries, Ltd. Heavy duty tire

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