JP2006015951A - Pneumatic radial tire for heavy load - Google Patents

Pneumatic radial tire for heavy load Download PDF

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Publication number
JP2006015951A
JP2006015951A JP2004197965A JP2004197965A JP2006015951A JP 2006015951 A JP2006015951 A JP 2006015951A JP 2004197965 A JP2004197965 A JP 2004197965A JP 2004197965 A JP2004197965 A JP 2004197965A JP 2006015951 A JP2006015951 A JP 2006015951A
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tire
ply
rubber
winding
bead
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JP2004197965A
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JP4500117B2 (en
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Kenichi Ueda
健一 上田
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Priority to JP2004197965A priority Critical patent/JP4500117B2/en
Priority to CNB2005100525462A priority patent/CN100462244C/en
Publication of JP2006015951A publication Critical patent/JP2006015951A/en
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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
    • B60C2015/0617—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber
    • B60C2015/0621—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber adjacent to the carcass turnup portion
    • 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
    • B60C2015/0617—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber
    • B60C2015/0625—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber provided at the terminal edge portion of a carcass or reinforcing layer

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  • Tires In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic radial tire for heavy load hardly causing separation at its winding end and excellent in durability. <P>SOLUTION: The pneumatic radial tire for heavy load comprises at least a sheet of carcass ply 1 winded from the inside to the outside and locked around a bead core 3 and a rubber filler 4. The radial tire comprises covering rubber 15 for covering an end part 1c of a winding ply 1b and soft rubber pads 16, 17 softer than the covering rubber 15 for covering both sides of the covering rubber 15 in the tire width direction. A distance a between a normal L drawn from an outer peripheral side face of a body ply 1a to an outer peripheral side end of a rim flange 11 and the end part 1c of the winding ply 1b is made to be shorter than 15mm. <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２、３に示すように、一対のビード部２に架け渡されるように配され、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を有する。カーカスプライ１の両端部は、ビード部２において、ビードコア３とそのタイヤ外周側に配されたゴムフィラー４との回りに、内側から外側に巻き上げられて係止される。即ち、カーカスプライ１は、タイヤ骨格をなすボディプライ１ａと、ビード部２にて巻き上げられた巻き上げプライ１ｂとから構成される。巻き上げプライ１ｂのタイヤ幅方向外側には、必要に応じてスチールコード又は有機繊維コードを有するビード補強層２１が配される。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が形成される。   In general, as shown in FIGS. 2 and 3, the pneumatic radial tire has at least one carcass ply 1 that is arranged so as to be bridged between a pair of bead portions 2 and that has a cord arrangement in the radial direction. Both end portions of the carcass ply 1 are wound up and locked from the inside to the outside around the bead core 3 and the rubber filler 4 disposed on the tire outer peripheral side in the bead portion 2. That is, the carcass ply 1 includes a body ply 1 a that forms a tire skeleton, and a winding ply 1 b that is wound up by the bead portion 2. A bead reinforcing layer 21 having a steel cord or an organic fiber cord is disposed on the outer side in the tire width direction of the winding ply 1b as necessary. A plurality of belt layers 8 are formed outside the carcass ply 1 of the tread portion 7 having the grooves 9.

重荷重用空気入りタイヤでは、高内圧での使用過程において、カーカスプライ１に張力が作用し、巻き上げプライがビードコア３側に引っ張られる。これにより、ビードコア３が回転モーメントを受け、リムフランジ１１上方のビード部２がタイヤ幅方向外側に大きく張り出すように変形する。更に、高荷重での使用過程において、リムフランジ１１上方のビード部２にはタイヤの負荷転動よる衝撃が伝達される。この張り出し変形やタイヤの負荷転動により、巻き上げプライ１ｂの端部１ｃ（以下、巻き上げ端と呼ぶ場合がある。）に歪みが集中すると、早期にセパレーションを引き起こす場合があり、ビード耐久力を悪化させる大きな要因になっていた。   In a heavy-duty pneumatic tire, tension is applied to the carcass ply 1 during use at high internal pressure, and the winding ply is pulled toward the bead core 3. Thereby, the bead core 3 receives a rotational moment, and the bead part 2 above the rim flange 11 is deformed so as to largely protrude outward in the tire width direction. Further, during the use process under a high load, the impact due to the rolling rolling of the tire is transmitted to the bead portion 2 above the rim flange 11. If strain is concentrated on the end portion 1c of the winding ply 1b (hereinafter sometimes referred to as a winding end) due to the overhang deformation or tire load rolling, separation may occur at an early stage, and the bead durability deteriorates. It was a big factor to make.

そこで、従来、ビード耐久力を改善するものとして、下記特許文献１、２には、巻き上げ端が配されるゴムパッドの硬度を比較的硬くした重荷重用空気入りタイヤが開示されている。また、下記特許文献３には、巻き上げ端とビード補強層の端部とを覆う被覆ゴムを備える重荷重用空気入りタイヤが開示され、下記特許文献４、５には、巻き上げ端を覆う被覆ゴムを所定の配合のゴム組成物により構成することでビード耐久力を向上する重荷重用空気入りタイヤが開示されている。   Thus, conventionally, as a means for improving the bead durability, Patent Documents 1 and 2 below disclose a heavy-duty pneumatic tire in which the hardness of a rubber pad on which a winding end is disposed is relatively hard. Patent Document 3 listed below discloses a heavy-duty pneumatic tire including a covering rubber that covers a winding end and an end portion of a bead reinforcing layer. Patent Documents 4 and 5 include a covering rubber that covers a winding end. A heavy-duty pneumatic tire that improves bead durability by comprising a rubber composition of a predetermined composition is disclosed.

しかしながら、従来の構造では、巻き上げ端がビード補強層よりもタイヤ径方向外側に配されており、そうでなくても巻き上げプライがリムフランジ上方に配されるものであったため、巻き上げ端が上述したビード部の張り出し変形やタイヤの負荷転動の影響を受け易く、ビード耐久力を低下させていた。その一方で、巻き上げ端の高さを低く設定した場合には、上述した張力によって巻き上げプライがビードコア側に引っ張られ易くなり、巻き上げ方向に沿ったせん断力が発生して歪みが大きくなるという問題があった。なお、下記特許文献４には、巻き上げ端がビード補強層（チェーファ）のよりもタイヤ径方向内側に配された構造が開示されているが、かかる構造は、単にビード補強層を巻き上げ端よりも上方に配したものであり、巻き上げ端の高さを従来より低くすることや巻き上げ端とリムフランジとの位置関係等の構成について開示するものではない。
特開平３−２２４８０５号公報 特開平５−９６９１５号公報 特開平５−３１９０３５号公報 特開平９−１５６３２５号公報 特開２００１−２７７８２２号公報 However, in the conventional structure, the hoisting end is arranged on the outer side in the tire radial direction from the bead reinforcing layer, and the hoisting ply is arranged above the rim flange. It was easily affected by overhang deformation of the bead part and load rolling of the tire, and the bead durability was reduced. On the other hand, when the height of the winding end is set low, the winding ply is easily pulled to the bead core side by the tension described above, and there is a problem that the shearing force along the winding direction is generated and distortion is increased. there were. Patent Document 4 below discloses a structure in which the winding end is arranged on the inner side in the tire radial direction with respect to the bead reinforcement layer (chafer). However, such a structure simply includes the bead reinforcement layer from the winding end. It is arranged above, and does not disclose a configuration such as a lowering of the height of the winding end or a positional relationship between the winding end and the rim flange.
JP-A-3-224805 JP-A-5-96915 JP-A-5-319035 JP-A-9-156325 JP 2001-277822 A

そこで、本発明の目的は、巻き上げ端でのセパレーションが生じ難く、耐久性に優れた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。   Therefore, an object of the present invention is to provide a heavy-duty pneumatic radial tire that is less likely to cause separation at the winding end and has excellent durability.

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、一対のビード部に架け渡されるように配されたボディプライと、前記ビード部が有するビードコアおよびそのビードコアのタイヤ外周側に配したゴムフィラーの回りに、内側から外側に巻き上げて係止された巻き上げプライと、からなる少なくとも１枚のカーカスプライを備える重荷重用空気入りラジアルタイヤにおいて、前記巻き上げプライの端部を覆う被覆ゴムと、その被覆ゴムよりも軟質で前記被覆ゴムのタイヤ幅方向両側を覆う軟質ゴムパッドとを備え、前記ボディプライの外周側面から規定リム装着時のリムフランジ外周側端に引いた法線と、前記巻き上げプライの端部との距離が１５ｍｍ未満であることを特徴とする。   That is, the heavy-duty pneumatic radial tire of the present invention includes a body ply arranged so as to be bridged between a pair of bead portions, a bead core included in the bead portion, and a rubber filler disposed on the tire outer periphery side of the bead core. A heavy-duty pneumatic radial tire comprising at least one carcass ply, and a covering rubber covering an end portion of the winding ply, and the covering rubber. A soft rubber pad that is soft and covers both sides in the tire width direction of the covering rubber, a normal drawn from the outer peripheral side surface of the body ply to the outer peripheral side end of the rim flange when a specified rim is mounted, and an end portion of the hoisting ply The distance is less than 15 mm.

本発明の重荷重用空気入りラジアルタイヤでは、ボディプライの外周側面から規定リム装着時のリムフランジ外周側端に引いた法線と、巻き上げプライの端部（巻き上げ端）との距離を１５ｍｍ未満とすることにより、巻き上げプライがリムフランジ上方に配されることがないため、巻き上げ端がビード部の張り出し変形やタイヤの負荷転動の影響を受け難くなり、巻き上げ端への歪みの集中を抑制することができる。また、巻き上げ端の高さが低くなり過ぎず、ビードコア側に過度に引っ張られることがない。ここで、規定リムとは、タイヤサイズに対応してＪＡＴＭＡで決められた標準となるリムを指す。また、上記構成では、従来に比べると巻き上げプライがビードコア側に引っ張られ易くなるが、巻き上げ端を比較的硬質の被覆ゴムで覆うことにより、巻き上げ端に作用する歪みを効果的に分散し、更にその被覆ゴムを軟質ゴムパッドで覆うことにより、その歪みを緩和して、セパレーションの発生を効果的に遅らせることができる。   In the heavy-duty pneumatic radial tire of the present invention, the distance between the normal line drawn from the outer peripheral side surface of the body ply to the outer peripheral side end of the rim flange when the specified rim is mounted, and the end (winding end) of the hoisting ply is less than 15 mm As a result, the hoisting ply is not disposed above the rim flange, so that the hoisting end is not easily affected by the overhang deformation of the bead portion or the load rolling of the tire, and the concentration of distortion at the hoisting end is suppressed. be able to. Further, the height of the winding end does not become too low and is not excessively pulled toward the bead core. Here, the prescribed rim refers to a standard rim determined by JATMA corresponding to the tire size. Further, in the above configuration, the winding ply is more easily pulled toward the bead core than in the past, but by covering the winding end with a relatively hard covering rubber, the strain acting on the winding end is effectively dispersed, and By covering the covering rubber with a soft rubber pad, it is possible to relieve the distortion and effectively delay the generation of separation.

上記において、前記軟質ゴムパッドのタイヤ幅方向外側に、タイヤ外周側端が前記巻き上げプライの端部よりもタイヤ径方向外側に配されたスチールコード補強層を備えるものが好ましい。   In the above, it is preferable that a steel cord reinforcing layer is provided on the outer side in the tire width direction of the soft rubber pad, with the tire outer peripheral side end being arranged on the outer side in the tire radial direction than the end portion of the winding ply.

軟質ゴムパッドのタイヤ幅方向外側に、タイヤ外周側端が巻き上げプライの端部よりもタイヤ径方向外側に配されたスチールコード補強層を配することにより、リムフランジ上方のビード部を効果的に補強して、タイヤの負荷転動などに対する耐久性を確保することができる。   By placing a steel cord reinforcement layer with the outer circumferential side end of the soft rubber pad on the outer side in the tire radial direction than the end of the rolled-up ply, the bead portion above the rim flange is effectively reinforced. As a result, durability against load rolling of the tire can be ensured.

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、規定リムに装着した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 mounted on a specified rim.

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層又は複数層のカーカスプライ１を備える。カーカスプライ１は、一対のビード部２に架け渡されるように配されたボディプライ１ａと、ビードコア３およびゴムフィラー４の回りに内側から外側に巻き上げて係止された巻き上げプライ１ｂとからなる。   As shown in FIG. 1, the heavy-duty pneumatic radial tire of the present invention includes one or more layers of carcass plies 1 in which steel cords, high-strength organic fiber cords, and the like are arranged in the tire radial direction. The carcass ply 1 includes a body ply 1 a disposed so as to be bridged between a pair of bead portions 2, and a winding ply 1 b wound around the bead core 3 and the rubber filler 4 from the inside to the outside and locked.

ビードコア３は、ゴムで被覆された断面円形のビードワイヤを、順次積層巻回して最密に充填した集合体をなして形成される。本実施形態では、その集合体の断面形状を六角形に形成し、その底辺がリム１０と略平行になるように配置している。これにより、外力による断面形状の変形を防止している。ゴムフィラー４は、タイヤ径方向に伸びる断面略三角形状をなしてビードコア３のタイヤ外周側に配されており、ゴム硬度（ＪＩＳＫ６２５３のタイプＡデュロメータ硬さ試験に準じて測定したゴム硬度、以下同じ。）が７６〜８８°であるものが例示される。   The bead core 3 is formed as an aggregate in which bead wires having a circular cross section covered with rubber are sequentially stacked and wound to form a densely packed body. In this embodiment, the cross-sectional shape of the aggregate is formed in a hexagonal shape, and the base is arranged so as to be substantially parallel to the rim 10. This prevents the cross-sectional shape from being deformed by an external force. The rubber filler 4 has a substantially triangular cross section extending in the tire radial direction, and is disposed on the tire outer peripheral side of the bead core 3. The rubber filler 4 is rubber hardness (rubber hardness measured according to JISK6253 type A durometer hardness test, and so on. .) Is 76 to 88 °.

本発明では、ボディプライ１ａの外周側面からリムフランジ１１の外周側端に法線Ｌを引いたとき、法線Ｌと巻き上げプライ１ｂの端部１ｃ（以下、巻き上げ端１ｃと呼ぶ場合がある。）との距離ａが１５ｍｍ未満であり、より好ましくは１０ｍｍ未満である。これにより、巻き上げプライ１ｂがリムフランジ１１の上方に配されることがないため、巻き上げ端１ｃがビード部の張り出し変形やタイヤの負荷転動の影響を受け難くなる。また、巻き上げ端１ｃの高さが低くなり過ぎず、巻き上げプライ１ｂがビードコア３側に過度に引っ張られることがない。なお、法線Ｌと巻き上げ端１ｃとの距離ａは、巻き上げ端１ｃの厚み中心から法線Ｌにおろした垂線の長さとなる。   In the present invention, when a normal line L is drawn from the outer peripheral side surface of the body ply 1a to the outer peripheral side end of the rim flange 11, the normal line L and the end 1c of the winding ply 1b (hereinafter, referred to as the winding end 1c) may be used. ) Is less than 15 mm, more preferably less than 10 mm. As a result, the winding ply 1b is not disposed above the rim flange 11, so that the winding end 1c is hardly affected by the overhanging deformation of the bead portion or the load rolling of the tire. Moreover, the height of the winding end 1c does not become too low, and the winding ply 1b is not excessively pulled toward the bead core 3 side. Note that the distance a between the normal L and the winding end 1c is the length of the perpendicular drawn from the thickness center of the winding end 1c to the normal L.

更に、本発明では、巻き上げ端１ｃが比較的硬質の被覆ゴム１５により覆われている。本発明は上述のように巻き上げ端１ｃを上記範囲に配するものであるため、従来に比べると巻き上げプライ１ｂがビードコア３側に引っ張られ易くなるが、巻き上げ端１ｃを被覆ゴム１５で覆い、更に被覆ゴム１５を後述する比較的軟質のゴムパッド１６、１７で覆うことにより、巻き上げ端１ｃに作用する歪みを効果的に分散・緩和して、セパレーションの発生を遅らせることができる。   Furthermore, in the present invention, the winding end 1c is covered with a relatively hard coating rubber 15. In the present invention, since the winding end 1c is arranged in the above range as described above, the winding ply 1b is easily pulled to the bead core 3 side as compared with the prior art, but the winding end 1c is covered with the covering rubber 15, and further By covering the covering rubber 15 with relatively soft rubber pads 16 and 17, which will be described later, it is possible to effectively disperse and relieve the strain acting on the winding end 1c, thereby delaying the occurrence of separation.

本実施形態では、被覆ゴム１５は、巻き上げ端１ｃにエッジテープ１２（例えば０．６ｍｍ厚）を断面コの字状に貼り付け、そのタイヤ幅方向両側からゴムシート１４（例えば１．５ｍｍ厚）を巻き上げプライ１ｂに沿って貼り付けることで形成される。エッジテープ１２とゴムシート１４とは、同配合のゴムにより構成されるものでもよいが、異なる配合のものでもよい。また、エッジテープ１２は、例えばナイロン等の有機繊維により構成されるものでもよい。   In the present embodiment, the covering rubber 15 has an edge tape 12 (for example, 0.6 mm thickness) attached to the winding end 1c in a U-shaped cross section, and rubber sheets 14 (for example, 1.5 mm thickness) from both sides in the tire width direction. Is attached along the winding ply 1b. The edge tape 12 and the rubber sheet 14 may be composed of rubber having the same composition, but may be composed of different compositions. Further, the edge tape 12 may be made of organic fibers such as nylon.

被覆ゴム１５は、ゴム硬度が６９〜７９°であることが好ましい。ゴム硬度が、６９°未満である場合または７９°を越える場合、カーカスプライ１との剛性差が大きくなるため、巻き上げ端１ｃの歪みを分散する効果が乏しくなり、ビード耐久力の向上効果が小さくなる傾向にある。なお、本実施形態において、被覆ゴム１５のゴム硬度とは、ゴムシート１４のゴム硬度を指す。   The covering rubber 15 preferably has a rubber hardness of 69 to 79 °. When the rubber hardness is less than 69 ° or exceeds 79 °, the difference in rigidity from the carcass ply 1 becomes large, so that the effect of dispersing the distortion of the winding end 1c becomes poor and the effect of improving the bead durability is small. Tend to be. In the present embodiment, the rubber hardness of the covering rubber 15 refers to the rubber hardness of the rubber sheet 14.

被覆ゴム１５は、巻き上げプライ１ｂの延長方向に沿った領域に配されている。巻き上げ端１ｃから被覆ゴム１５のタイヤ外周側端までの、法線Ｌに対して垂直方向の距離ｂは、好ましくは５ｍｍ以上であり、より好ましくは１０ｍｍ以上である。これにより、巻き上げ端１ｃにおける歪みを効果的に分散することができる。   The covering rubber 15 is disposed in a region along the extending direction of the winding ply 1b. The distance b in the direction perpendicular to the normal L from the winding end 1c to the tire outer peripheral side end of the covering rubber 15 is preferably 5 mm or more, more preferably 10 mm or more. Thereby, the distortion in the winding end 1c can be effectively dispersed.

ゴムパッド１６は、下方が巻き上げプライ１ｂとゴムフィラー４との間に入り込むように、タイヤ径方向に延びた領域に配されている。更に、ゴムパッド１７が、ゴムパッド１６と共に巻き上げプライ１ｂを挟み込むように、タイヤ径方向に延びた領域に配されている。ゴムパッド１６、１７は、被覆ゴム１５よりも軟質であるとともに、被覆ゴム１５のタイヤ幅方向両側を覆っている（即ち、ゴムパッド１６、１７が前記軟質ゴムパッドに相当する。）。これにより、巻き上げ端１ｃに作用する歪みを効果的に緩和して、セパレーションの発生を遅らせることができる。   The rubber pad 16 is arranged in a region extending in the tire radial direction so that the lower part enters between the winding ply 1 b and the rubber filler 4. Further, the rubber pad 17 is disposed in a region extending in the tire radial direction so as to sandwich the winding ply 1 b together with the rubber pad 16. The rubber pads 16 and 17 are softer than the covering rubber 15 and cover both sides of the covering rubber 15 in the tire width direction (that is, the rubber pads 16 and 17 correspond to the soft rubber pad). Thereby, the distortion which acts on the winding-up end 1c can be relieved effectively, and generation | occurrence | production of a separation can be delayed.

ゴムパッド１６、１７は、被覆ゴム１５よりもゴム硬度が２〜１５°低いものが好ましく、３〜１２°低いものがより好ましい。当該硬度差が１５°を越えると、ゴムパッド１６、１７が軟らか過ぎるため、ビード耐久力を悪化させる傾向にある。一方、硬度差が２°未満であると、巻き上げ端１ｃの歪みが分散し難く、ビード耐久力が低下する傾向にある。なお、ゴムパッド１６とゴムパッド１７とは、ゴム硬度が同じものでもよく、異なるものでもよい。   The rubber pads 16 and 17 preferably have a rubber hardness that is 2 to 15 ° lower than that of the coated rubber 15, and more preferably 3 to 12 ° lower. If the hardness difference exceeds 15 °, the rubber pads 16 and 17 are too soft and tend to deteriorate the bead durability. On the other hand, if the hardness difference is less than 2 °, the distortion at the winding end 1c is difficult to disperse and the bead durability tends to decrease. The rubber pad 16 and the rubber pad 17 may have the same or different rubber hardness.

ゴムパッド１７のタイヤ幅方向外側には、スチールコードを有するスチール補強層５（前記スチールコード補強層に相当する。）が、ゴムパッド１７外面に沿って配されている。スチール補強層５のタイヤ外周側端は、巻き上げ端１ｃよりもタイヤ径方向外側に配され、リムフランジ１１の略上方に位置している。スチール補強層５には、高内圧での使用に起因する張力がカーカスプライ１ほど作用しないため、端部の歪みが比較的小さく、リムフランジ１１上方のビード部を効果的に補強して、タイヤの負荷転動などに対する耐久性を確保することができる。   On the outer side in the tire width direction of the rubber pad 17, a steel reinforcing layer 5 having a steel cord (corresponding to the steel cord reinforcing layer) is disposed along the outer surface of the rubber pad 17. The tire outer peripheral side end of the steel reinforcing layer 5 is disposed on the outer side in the tire radial direction with respect to the winding end 1 c and is positioned substantially above the rim flange 11. The steel reinforcement layer 5 does not act as much as the carcass ply 1 due to the use of high internal pressure. Therefore, the distortion of the end portion is relatively small, and the bead portion above the rim flange 11 is effectively reinforced so that the tire It is possible to ensure durability against load rolling.

本実施形態では、スチール補強層５のタイヤ外周側端に、エッジテープ１３が断面コの字状に貼り付けられている。これにより、スチール補強層５のタイヤ外周側端に集中する歪みを緩和することができる。更に、スチール補強層５のタイヤ内周側端は、カーカスプライ１の巻き上げ底部のタイヤ幅方向外側にて係止されている。これにより、高内圧での使用過程においてビードコア３に作用する回転モーメントの影響を受け難く、タイヤ外周側端への歪みの集中を抑制できる。   In this embodiment, the edge tape 13 is affixed to the tire outer peripheral side end of the steel reinforcing layer 5 in a U-shaped cross section. Thereby, the distortion concentrated on the tire outer peripheral side end of the steel reinforcement layer 5 can be relieved. Furthermore, the tire inner peripheral side end of the steel reinforcing layer 5 is locked on the outer side in the tire width direction of the rolled-up bottom portion of the carcass ply 1. Thereby, it is hard to receive the influence of the rotational moment which acts on the bead core 3 in the use process in a high internal pressure, and can suppress the concentration of distortion to a tire outer peripheral side end.

スチール補強層５のタイヤ幅方向外側には、ナイロンコードを有するナイロン補強層６が、スチール補強層５の外面に沿って配されている。本実施形態は、ナイロン補強層６が２枚の補強層からなる例を示している。ナイロン補強層６は、ビード部２にて内側から外側に巻き上げられるとともに、タイヤ幅方向外側に位置する端部がスチール補強層５よりもタイヤ径方向外側に配されている。巻き上げ端１ｃおよび補強層５、６の端部は、本実施形態のように各々タイヤ径方向にずらして配されるものが好ましく、これにより各端部への歪みの集中を抑制することができる。   On the outer side of the steel reinforcing layer 5 in the tire width direction, a nylon reinforcing layer 6 having a nylon cord is disposed along the outer surface of the steel reinforcing layer 5. This embodiment shows an example in which the nylon reinforcing layer 6 is composed of two reinforcing layers. The nylon reinforcing layer 6 is wound up from the inner side to the outer side at the bead portion 2, and an end portion located on the outer side in the tire width direction is arranged on the outer side in the tire radial direction than the steel reinforcing layer 5. The winding ends 1c and the end portions of the reinforcing layers 5 and 6 are preferably arranged so as to be shifted in the tire radial direction as in the present embodiment, whereby the concentration of strain on each end portion can be suppressed. .

ナイロン補強層６のタイヤ幅方向外側には、タイヤ径方向に延びるゴムパッド１８が、ナイロン補強層６の外面に沿って配されている。ゴムパッド１８としては、ゴムパッド１７と同配合のゴムよりなるものが例示される。ゴムパッド１８のタイヤ幅方向外側には、リムに直接接触するゴムチェーファ１９と、サイドウォール部を構成するサイドウォールゴム２０が配されている。   A rubber pad 18 extending in the tire radial direction is disposed along the outer surface of the nylon reinforcing layer 6 on the outer side in the tire width direction of the nylon reinforcing layer 6. Examples of the rubber pad 18 include those made of rubber having the same composition as the rubber pad 17. On the outer side in the tire width direction of the rubber pad 18, a rubber chafer 19 that directly contacts the rim and a side wall rubber 20 that constitutes a side wall portion are disposed.

本発明の重荷重用空気入りラジアルタイヤは、ビード部２回りの構造以外は、従来公知のタイヤと同じであり、図２に示すものと同様である。即ち、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、更に必要に応じてベルト補強層が配される。更に、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 2, and is the same as that shown in FIG. That is, on the outside of the carcass ply 1 of the tread portion 7, one or a plurality of belt layers 8 are arranged as in the prior art, and further a belt reinforcing layer is arranged as necessary. Further, a tread pattern having a plurality of main grooves 9 in the tire circumferential direction is formed on the outer circumferential surface of the tire by the outer tread rubber. 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、巻き上げ端１ｃを法線Ｌよりもタイヤ径方向外側に配した例を示したが、本発明では、距離ａが１５ｍｍ未満であれば、巻き上げ端１ｃを法線Ｌよりもタイヤ径方向内側に配するものでもよい。 [Other Embodiments]
(1) In the above-described embodiment, an example in which the winding end 1c is arranged on the outer side in the tire radial direction from the normal line L is shown. However, in the present invention, if the distance a is less than 15 mm, the winding end 1c is the normal line. It may be arranged on the inner side in the tire radial direction than L.

（２）前述の実施形態では、ビード補強層として、スチールコードを有するスチール補強層５を配した例を示したが、本発明はこれに代えて、例えば有機繊維コードを有する補強層を配してもよい。また、前述の実施形態では、ビード補強層としてのスチール補強層５のタイヤ幅方向外側に、ナイロン補強層６を配した例を示したが、本発明はこれに限られるものではない。また、ナイロン補強層６に代えて、異なる構成材料よりなる補強層を配してもよい。   (2) In the above-described embodiment, the example in which the steel reinforcing layer 5 having the steel cord is arranged as the bead reinforcing layer is shown. However, the present invention is replaced by, for example, a reinforcing layer having an organic fiber cord. May be. Further, in the above-described embodiment, the example in which the nylon reinforcing layer 6 is arranged on the outer side in the tire width direction of the steel reinforcing layer 5 as the bead reinforcing layer is shown, but the present invention is not limited to this. Further, instead of the nylon reinforcing layer 6, a reinforcing layer made of a different constituent material may be provided.

（３）前述の実施形態では、スチール補強層５のタイヤ内周側端が、カーカスプライ１の巻き上げ底部のタイヤ幅方向外側にて係止される例を示したが、本発明では、スチール補強層５をビード部２にて内側から外側に巻き上げて係止する構成でも構わない。   (3) In the above-described embodiment, the example in which the tire inner peripheral side end of the steel reinforcing layer 5 is locked at the outer side in the tire width direction of the rolled-up bottom portion of the carcass ply 1 is shown. The layer 5 may be wound up and locked from the inside to the outside by the bead portion 2.

（４）前述の実施形態では、断面形状が六角形のビードコア３を用いる例を示したが、本発明では、ビードコア３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。   (4) In the above-described embodiment, the example in which the bead core 3 having a hexagonal cross section is used. However, in the present invention, the bead core 3 may have a polygon having various cross sections. 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.

（１）耐久性
耐久性試験として、タイヤをサイズ８．００Ｖのリムに組み付け、直径１７００ｍｍのドラム上を内圧８３０ｋＰａ、荷重３３５０ｋｇｆ（２４時間ごとに１０％増加）、速度２５ｋｍ／ｈにて、ビード部に故障が発生するまで走行させた。比較例２を１００として指数評価し、数値が大きいほど走行距離が大きい、即ち耐久性に優れていることを示す。 (1) Durability As a durability test, a tire was assembled on a rim of size 8.00 V, and a bead was run on a drum having a diameter of 1700 mm at an internal pressure of 830 kPa, a load of 3350 kgf (10% increase every 24 hours), and a speed of 25 km / h. The vehicle was run until a failure occurred. The index is evaluated with Comparative Example 2 as 100, and the greater the value, the greater the travel distance, that is, the better the durability.

（２）製造コスト
タイヤの作製に要した材料費から製造コストを算出した。比較例１を１００として指数評価し、数値が大きいほど製造コストが高いことを示す。 (2) Manufacturing cost The manufacturing cost was computed from the material cost required for preparation of a tire. Index evaluation is performed with Comparative Example 1 as 100, and the larger the value, the higher the manufacturing cost.

比較例１
図１に示すビード構造において、被覆ゴム１５を備えず、巻き上げ端１ｃを法線Ｌよりもタイヤ径方向外側に配して距離ａを２ｍｍとした重荷重用空気入りラジアルタイヤ（サイズ１１．００Ｒ２０）を準備し、上記の評価を行った。なお、タイヤが備えるカーカスプライ１は、エンド数（コード幅方向１インチあたりのコード本数）を１５とし、３＋９＋１５×０．１７５＋０．１５の構造のスチールコードにより構成した。また、スチール補強層５は、エンド数を１３とし、上記構造のスチールコードにより構成した。更に、ナイロン補強層６は、エンド数を２２．５とし、１４００ｄｔｅｘ／２のナイロンコードにより構成した。 Comparative Example 1
In the bead structure shown in FIG. 1, a heavy-duty pneumatic radial tire (size 11.00R20) that does not include the covering rubber 15 and that has the rolled-up end 1c disposed outside the normal L in the tire radial direction and the distance a is 2 mm. Was prepared and the above evaluation was performed. The carcass ply 1 included in the tire was composed of steel cords having a structure of 3 + 9 + 15 × 0.175 + 0.15 with 15 ends (the number of cords per inch in the cord width direction). Further, the steel reinforcing layer 5 is composed of 13 steel cords having the above-mentioned number of ends. Further, the nylon reinforcing layer 6 was made of nylon cord of 1400 dtex / 2 with the number of ends being 22.5.

比較例２
図１に示すビード構造において、巻き上げ端１ｃを法線Ｌよりもタイヤ径方向外側に配して距離ａを３０ｍｍとし、巻き上げ端１ｃからの距離ｂを２０ｍｍとした被覆ゴム１５を備える構造以外は、比較例１と同じである重荷重用空気入りラジアルタイヤを準備し、上記の評価を行った。 Comparative Example 2
In the bead structure shown in FIG. 1, except for the structure including the covering rubber 15 in which the winding end 1c is arranged on the outer side in the tire radial direction from the normal line L, the distance a is 30 mm, and the distance b from the winding end 1c is 20 mm. A heavy-duty pneumatic radial tire that is the same as Comparative Example 1 was prepared and evaluated as described above.

実施例
図１に示すビード構造において、巻き上げ端１ｃを法線Ｌよりもタイヤ径方向外側に配して距離を２ｍｍとし、巻き上げ端１ｃからの距離ｂを２０ｍｍとした被覆ゴム１５を備える構造以外は、比較例１と同じである重荷重用空気入りラジアルタイヤを準備し、上記の評価を行った。 Example In the bead structure shown in FIG. 1, other than the structure provided with the covering rubber 15 in which the winding end 1c is arranged on the outer side in the tire radial direction from the normal line L, the distance is 2 mm, and the distance b from the winding end 1c is 20 mm. Prepared a heavy-duty pneumatic radial tire that was the same as Comparative Example 1, and evaluated the above.

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

Figure 2006015951
表１の結果が示すように、実施例では比較例１、２と比較して、耐久性が大幅に改善されており、本発明の構成が優れたビード耐久力を発揮することがわかった。これに対して、比較例１では、単に巻き上げ高さを低くしただけなので、巻き上げプライがビードコア側に引っ張られて巻き上げ端に歪みが集中し易くなり、比較例２では、巻き上げプライがリムフランジ上方に配されているため、ビード部の張り出し変形やタイヤの負荷転動の影響を受け易くなり、それぞれ耐久性が比較的低かった。また、比較例２では比較例１と比較して、被覆ゴムの配設およびカーカスプライの巻き上げ高さに起因して製造コストが高くなっているが、実施例は耐久性を向上しつつ、巻き上げ高さを低くすることができるため、製造コストを低減できることがわかる。
Figure 2006015951
 As the result of Table 1 shows, compared with the comparative examples 1 and 2, in the Example, it turned out that durability is improved significantly and the structure of this invention exhibits the bead durability excellent. On the other hand, in Comparative Example 1, since the winding height is simply lowered, the winding ply is pulled to the bead core side, and distortion tends to concentrate on the winding end. In Comparative Example 2, the winding ply is located above the rim flange. Therefore, it is easily affected by the overhang deformation of the bead part and the load rolling of the tire, and the durability is relatively low. In Comparative Example 2, the manufacturing cost is higher due to the placement of the covering rubber and the carcass ply winding height as compared with Comparative Example 1. However, the example is improved while improving the durability. It can be seen that the manufacturing cost can be reduced because the height can be reduced.

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タイヤのビード部の一例を示す要部断面図Sectional drawing of the principal part showing an example of a bead portion of a conventional heavy duty pneumatic tire

符号の説明Explanation of symbols

１ カーカスプライ
１ａ ボディプライ
１ｂ 巻き上げプライ
１ｃ 巻き上げ端
２ ビード部
３ ビードコア
４ ゴムフィラー
５ スチール補強層
６ ナイロン補強層
１０ リム
１１ リムフランジ
１５ 被覆ゴム
１６ ゴムパッド
１７ ゴムパッド
ａ 法線と巻き上げプライの端部との距離
Ｌ 法線 DESCRIPTION OF SYMBOLS 1 Carcass ply 1a Body ply 1b Winding ply 1c Winding end 2 Bead part 3 Bead core 4 Rubber filler 5 Steel reinforcing layer 6 Nylon reinforcing layer 10 Rim 11 Rim flange 15 Cover rubber 16 Rubber pad 17 Rubber pad a Normal line and end of the winding ply Distance L of normal

Claims (2)

一対のビード部に架け渡されるように配されたボディプライと、前記ビード部が有するビードコアおよびそのビードコアのタイヤ外周側に配したゴムフィラーの回りに、内側から外側に巻き上げて係止された巻き上げプライと、からなる少なくとも１枚のカーカスプライを備える重荷重用空気入りラジアルタイヤにおいて、
前記巻き上げプライの端部を覆う被覆ゴムと、その被覆ゴムよりも軟質で前記被覆ゴムのタイヤ幅方向両側を覆う軟質ゴムパッドとを備え、
前記ボディプライの外周側面から規定リム装着時のリムフランジ外周側端に引いた法線と、前記巻き上げプライの端部との距離が１５ｍｍ未満で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。 A body ply arranged so as to be bridged between a pair of bead parts, a bead core which the bead part has, and a rubber filler which is arranged on the tire outer periphery side of the bead core and wound up from the inside to the outside and locked In a heavy duty pneumatic radial tire comprising at least one carcass ply comprising a ply,
Cover rubber covering the end of the winding ply, and a soft rubber pad that is softer than the cover rubber and covers both sides in the tire width direction of the cover rubber,
A heavy-duty pneumatic radial tire characterized in that a distance between a normal line drawn from an outer peripheral side surface of the body ply to an outer peripheral side end of the rim flange when a specified rim is mounted and an end of the hoisting ply is less than 15 mm. 前記軟質ゴムパッドのタイヤ幅方向外側に、タイヤ外周側端が前記巻き上げプライの端部よりもタイヤ径方向外側に配されたスチールコード補強層を備える請求項１記載の重荷重用空気入りラジアルタイヤ。   2. The heavy-duty pneumatic radial tire according to claim 1, further comprising a steel cord reinforcing layer disposed on an outer side in a tire width direction of the soft rubber pad and on an outer peripheral side of the tire that is disposed on an outer side in the tire radial direction with respect to an end portion of the winding ply.
JP2004197965A 2004-07-05 2004-07-05 Heavy duty pneumatic radial tire Expired - Lifetime JP4500117B2 (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
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JP2008290591A (en) * 2007-05-25 2008-12-04 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2009292309A (en) * 2008-06-05 2009-12-17 Toyo Tire & Rubber Co Ltd Rubber composition for chafer pad and pneumatic radial tire
FR2953458A1 (en) * 2009-12-09 2011-06-10 Michelin Soc Tech PNEUMATIC BOURRELET FOR HEAVY VEHICLE TYPE GENIE CIVIL
JP2012076678A (en) * 2010-10-05 2012-04-19 Yokohama Rubber Co Ltd:The Pneumatic tire
WO2012168270A1 (en) * 2011-06-07 2012-12-13 Compagnie Generale Des Etablissements Michelin Bead of a tyre for a heavy vehicle of construction plant type
JP2015105032A (en) * 2013-11-29 2015-06-08 東洋ゴム工業株式会社 Pneumatic tire and method for manufacturing same
US9308782B2 (en) 2010-09-21 2016-04-12 The Goodyear Tire & Rubber Company Pneumatic tire having turn-up pad
US10099516B2 (en) 2014-12-22 2018-10-16 Toyo Tire & Rubber Co., Ltd. Pneumatic radial tire with specified bead portions
CN109927491A (en) * 2017-12-15 2019-06-25 东洋橡胶工业株式会社 Inflatable radial tyre for heavy load
CN110001307A (en) * 2017-12-22 2019-07-12 东洋橡胶工业株式会社 Inflatable radial tyre for heavy load
JP2020066250A (en) * 2018-10-22 2020-04-30 住友ゴム工業株式会社 tire

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FR2953459B1 (en) * 2009-12-09 2011-11-25 Michelin Soc Tech PNEUMATIC BOURRELET FOR HEAVY VEHICLE TYPE GENIE CIVIL
CN103317973A (en) * 2013-07-09 2013-09-25 广州市华南橡胶轮胎有限公司 Tire with improved tire bead structure and manufacturing method thereof
JP6126957B2 (en) * 2013-09-17 2017-05-10 東洋ゴム工業株式会社 Pneumatic tire manufacturing method
JP6153858B2 (en) * 2013-12-19 2017-06-28 東洋ゴム工業株式会社 Pneumatic radial tire
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JP2008290591A (en) * 2007-05-25 2008-12-04 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2009292309A (en) * 2008-06-05 2009-12-17 Toyo Tire & Rubber Co Ltd Rubber composition for chafer pad and pneumatic radial tire
AU2010330020B2 (en) * 2009-12-09 2014-04-10 Compagnie Generale Des Etablissements Michelin Tire bead for a heavy civil engineering vehicle
FR2953458A1 (en) * 2009-12-09 2011-06-10 Michelin Soc Tech PNEUMATIC BOURRELET FOR HEAVY VEHICLE TYPE GENIE CIVIL
WO2011070017A1 (en) * 2009-12-09 2011-06-16 Societe De Technologie Michelin Tire bead for a heavy civil engineering vehicle
EA022092B1 (en) * 2009-12-09 2015-10-30 Компани Женераль Дез Этаблиссман Мишлен Tire bead for a heavy civil engineering vehicle
JP2013513507A (en) * 2009-12-09 2013-04-22 コンパニー ゼネラール デ エタブリッスマン ミシュラン Civil engineering type heavy vehicle tire beads
US8960253B2 (en) 2009-12-09 2015-02-24 Compagne Generale Des Etablissements Michelin Tire bead for a heavy civil engineering vehicle
US9308782B2 (en) 2010-09-21 2016-04-12 The Goodyear Tire & Rubber Company Pneumatic tire having turn-up pad
JP2012076678A (en) * 2010-10-05 2012-04-19 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2014518811A (en) * 2011-06-07 2014-08-07 コンパニー ゼネラール デ エタブリッスマン ミシュラン Construction plant type heavy vehicle tire beads
CN103582575A (en) * 2011-06-07 2014-02-12 米其林集团总公司 Bead of a tyre for a heavy vehicle of construction plant type
FR2976219A1 (en) * 2011-06-07 2012-12-14 Michelin Soc Tech PNEUMATIC BOURRELET FOR HEAVY VEHICLE TYPE GENIE CIVIL
WO2012168270A1 (en) * 2011-06-07 2012-12-13 Compagnie Generale Des Etablissements Michelin Bead of a tyre for a heavy vehicle of construction plant type
US9421830B2 (en) 2011-06-07 2016-08-23 Compagnie Generale Des Etablissements Michelin Bead of a tire for a heavy vehicle of construction plant type
AU2012266467B2 (en) * 2011-06-07 2016-05-26 Compagnie Generale Des Etablissements Michelin Bead of a tyre for a heavy vehicle of construction plant type
JP2015105032A (en) * 2013-11-29 2015-06-08 東洋ゴム工業株式会社 Pneumatic tire and method for manufacturing same
US10099516B2 (en) 2014-12-22 2018-10-16 Toyo Tire & Rubber Co., Ltd. Pneumatic radial tire with specified bead portions
DE102015122466B4 (en) * 2014-12-22 2021-06-24 Toyo Tire & Rubber Co., Ltd. Pneumatic radial tires
CN109927491A (en) * 2017-12-15 2019-06-25 东洋橡胶工业株式会社 Inflatable radial tyre for heavy load
JP2019107949A (en) * 2017-12-15 2019-07-04 Ｔｏｙｏ Ｔｉｒｅ株式会社 Pneumatic radial tire for heavy load
JP7020899B2 (en) 2017-12-15 2022-02-16 Ｔｏｙｏ Ｔｉｒｅ株式会社 Pneumatic radial tires for heavy loads
CN110001307A (en) * 2017-12-22 2019-07-12 东洋橡胶工业株式会社 Inflatable radial tyre for heavy load
JP2020066250A (en) * 2018-10-22 2020-04-30 住友ゴム工業株式会社 tire
JP7187969B2 (en) 2018-10-22 2022-12-13 住友ゴム工業株式会社 tire

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