JPH061124A - Radial tire - Google Patents
Radial tireInfo
- Publication number
- JPH061124A JPH061124A JP15831192A JP15831192A JPH061124A JP H061124 A JPH061124 A JP H061124A JP 15831192 A JP15831192 A JP 15831192A JP 15831192 A JP15831192 A JP 15831192A JP H061124 A JPH061124 A JP H061124A
- Authority
- JP
- Japan
- Prior art keywords
- rubber layer
- tire
- section
- bead
- cord
- 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.)
- Pending
Links
- 239000011324 bead Substances 0.000 claims abstract description 48
- 229920001875 Ebonite Polymers 0.000 claims abstract description 27
- 239000000945 filler Substances 0.000 claims description 15
- 230000007423 decrease Effects 0.000 abstract description 3
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 241000254043 Melolonthinae Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ラジアルタイヤに係
り、特に、ビードフィラーの構造を改善することで高負
荷連続走行時の耐久性に優れたラジアルタイヤに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radial tire, and more particularly to a radial tire having an improved bead filler structure, which is excellent in durability under high load continuous running.
【０００２】[0002]
【従来の技術】ラジアルタイヤでは、乗心地や横剛性等
を改善するため、ビード部とサイドウォールの下部にビ
ードフィラーを追加している。ビード部重量の軽減を考
えビード部のゴムゲージダウン及びビード剛性に影響す
る有機繊維やスチール等の補強帯の除去を実施するに
は、従来のビードフィラー形状ではビード部の剛性不足
で車の操安性を確保するのが困難となる。2. Description of the Related Art In a radial tire, a bead filler is added to a bead portion and a lower portion of a sidewall in order to improve riding comfort and lateral rigidity. In order to reduce the weight of the bead part and reduce the rubber gauge of the bead part and remove the reinforcing band such as organic fiber or steel that affects the bead rigidity, the conventional bead filler shape is insufficient in the bead part rigidity and the vehicle operation is It will be difficult to secure security.
【０００３】このため、ビードフィラーのゴムに硬軟を
つけて複合構造としたものが、特開昭52-15004号 (従来
例の１) 、特開昭53-83206号 (従来例の２) 、特開平3-
169725号 (従来例の３）等で提案されたラジアルタイヤ
がある。For this reason, a composite structure in which the bead filler rubber is hardened and softened is disclosed in JP-A-52-15004 (conventional example 1), JP-A-53-83206 (conventional example 2), JP-A-3-
There is a radial tire proposed by 169725 (conventional example 3) and the like.
【０００４】[0004]
【発明が解決しようとする課題】従来例の１〜３はいず
れもＪＩＳＡが90程度のハードゴム層とＪＩＳＡが65程
度のソフトゴム層との断面形状が三角形状であり、これ
を接合一体化したものであるため、ハードゴム層による
剛性確保が充分でなく、負荷応力の集中し易いコード端
末の応力緩和が不足し、ビード部の耐久性、及び車の操
安性の点で課題があった。In all of the conventional examples 1 to 3, the hard rubber layer having a JISA of about 90 and the soft rubber layer having a JISA of about 65 have a triangular cross-sectional shape, and these are joined and integrated. However, since the rigidity is not sufficiently secured by the hard rubber layer, stress relaxation of the cord end where load stress is likely to be concentrated is insufficient, and there are problems in terms of durability of the bead portion and vehicle steering stability.
【０００５】本発明は、ビード部上においてコード折返
部における剛性はハードゴム層で担持させる一方、コー
ド折返部の端末ではソフトゴム層による応力緩和を保証
することで耐久性と操安性を確保しつつタイヤ重量の軽
減を図ったことを目的とする。According to the present invention, the rigidity in the cord folding portion on the bead portion is supported by the hard rubber layer, while the soft rubber layer guarantees the stress relaxation by the soft rubber layer at the terminal of the cord folding portion to ensure durability and maneuverability. While aiming to reduce the weight of the tire.
【０００６】[0006]
【課題を解決するための手段】本発明は、一対のビード
コア5 上のそれぞれに位置された硬度の高いハードゴム
層11と該ゴム層11の径外側に一体化された硬度の低いソ
フトゴム層12とからなるビードフィラー6 を備え、ラジ
アルカーカスコード7 の両端部をビードトゥ側からビー
ドコア5 を囲んでビードヒールに向って折返されたコー
ド折返部8 を備えているラジアルタイヤにおいて、前述
の目的を達成するために、次の技術的手段を講じてい
る。According to the present invention, a hard rubber layer 11 having a high hardness located on each of a pair of bead cores 5 and a soft rubber layer 12 having a low hardness integrated on the radially outer side of the rubber layer 11 are provided. To achieve the above-mentioned object in a radial tire having a bead filler 6 consisting of and a cord folding part 8 in which both ends of the radial carcass cord 7 are folded from the bead toe side around the bead core 5 toward the bead heel. In order to do so, the following technical measures are taken.
【０００７】すなわち、本発明は、前記ハードゴム層11
は、タイヤ外面側でコード折返部8の端末8Aと対応する
位置にタイヤ内面側に向って弯曲状のくびれ部11A を有
し、かつ、該くびれ部11A を介してタイヤ内面側におい
て径方向外方に延伸した厚さの漸減する延伸部11B を有
し、前記ソフトゴム層12の径内端はコード折返部8 と対
応する前記くびれ部11A に嵌合配置されてハードゴム層
11に一体的に接合されて前記延伸部11B とともに径外方
延伸されていることを特徴とするものである。That is, according to the present invention, the hard rubber layer 11
Has a constricted portion 11A that is curved toward the tire inner surface at a position corresponding to the terminal 8A of the cord folding portion 8 on the tire outer surface side, and is radially outward on the tire inner surface side through the constricted portion 11A. The soft rubber layer 12 has a radially extending end portion 11B that is gradually reduced in thickness, and the inner diameter end of the soft rubber layer 12 is fitted and arranged at the constricted portion 11A corresponding to the cord folding portion 8 to form the hard rubber layer.
It is characterized in that it is integrally joined to 11 and is radially outwardly extended together with the extending portion 11B.
【０００８】[0008]
【作用】本発明によれば、ビード部の剛性は、ビードコ
アー5 上に配置されたハードゴム層11によって確保され
るが、該ハードゴム層11はコード折返部8 の端末8Aと対
応する位置に弯曲状くびれ部11A を有し、このくびれ部
11A から厚さの漸減する延伸部11B を有することから、
ハードゴム層11の剛性は確保される。According to the present invention, the rigidity of the bead portion is ensured by the hard rubber layer 11 arranged on the bead core 5, and the hard rubber layer 11 is curved at a position corresponding to the terminal 8A of the cord folding portion 8. It has a constricted part 11A, and this constricted part
Since it has a stretched portion 11B whose thickness gradually decreases from 11A,
The rigidity of the hard rubber layer 11 is secured.
【０００９】一方、くびれ部11A にはソフトゴム層12の
径内端が嵌合されて一体化されていることから、コード
折返部8 の端末8Aは応力集中してもこれを充分に緩和
し、損傷発生を防止する。On the other hand, since the inner diameter end of the soft rubber layer 12 is fitted and integrated with the constricted portion 11A, the end 8A of the cord folding portion 8 sufficiently relaxes even if stress is concentrated. , Prevent the occurrence of damage.
【００１０】[0010]
【実施例】以下、図を参照して本発明の実施例を説明す
ると、全体構成を示した図１(A)において、本発明に係
るラジアルタイヤ1 は、左右一対のビード部2 をサイド
ウォール部3 およびトレッド部4 を介して断面トロイダ
ル形に連設してなる。左右のビード部2 には金属線等を
束ねてなる断面六角形状のビードコア5 が埋設してあ
り、このビードコア5 上に断面楔状のビードフィラー6
が備えられているとともに、ラジアルカーカスコード7
の両端部をビードトゥ側からビードコア5 を取囲んでビ
ードヒールに向って折返されたコード折返部8 とされ、
カーカスコード7 のクラウン部にはベルト層9 を備えて
いる。なおビード部2 は車輪のリム10に嵌着されてい
る。EXAMPLE An example of the present invention will be described below with reference to the drawings. In FIG. 1 (A) showing the overall configuration, a radial tire 1 according to the present invention has a pair of left and right bead portions 2 as sidewalls. The toroidal section is continuously provided via the section 3 and the tread section 4. A bead core 5 having a hexagonal cross section formed by bundling metal wires and the like is embedded in the bead portions 2 on the left and right, and a bead filler 6 having a wedge-shaped cross section is provided on the bead core 5.
Radial car cascode 7
Both end parts of the cord are surrounded by the bead core 5 from the bead toe side and folded back toward the bead heel.
A belt layer 9 is provided on the crown portion of the carcass cord 7. The bead portion 2 is fitted on the rim 10 of the wheel.
【００１１】図１(B) 参照すると、ビードフィラー6 は
ハードゴム層11とソフトゴム層12とからなり、ハードゴ
ム層11のゴム硬度は70〜95、好ましくは85〜95とされ、
一方、ソフトゴム層12のゴム硬度は55〜70、好ましくは
60〜70とされている。ハードゴム層11の高さHIはビード
フィラー6 の高さH の50％〜90％とされていて、タイヤ
外面側でコード折返部8 の端末8Aと対応する位置にフィ
ラーゲージ厚さa の40〜60％に相当する半径b によるタ
イヤ内面側に沿う弯曲状のくびれ部11A を有し、かつ該
くびれ部11A を介してタイヤ内面側において径外方向に
薄膜状に延伸して、厚さの漸減する延伸部11B を有して
いる。Referring to FIG. 1 (B), the bead filler 6 comprises a hard rubber layer 11 and a soft rubber layer 12, and the hard rubber layer 11 has a rubber hardness of 70 to 95, preferably 85 to 95.
On the other hand, the rubber hardness of the soft rubber layer 12 is 55 to 70, preferably
It is said to be 60 to 70. The height HI of the hard rubber layer 11 is 50% to 90% of the height H of the bead filler 6, and the height HI of the filler gauge is 40% to 40% at the position corresponding to the terminal 8A of the cord folding section 8 on the tire outer surface side. It has a curved constriction 11A along the tire inner surface side with a radius b corresponding to 60%, and it extends radially outwardly on the tire inner surface side through the constriction 11A to form a thin film, and the thickness gradually decreases. It has a stretched portion 11B.
【００１２】ソフトゴム層12の径内端はビード折返部8
の内側で前記くびれ部11A に嵌合接合されて一体化され
ていて、径外方向にくさび状に延伸している。ここで、
ハードゴム層11の高さHIをビードフィラー6 の高さH の
50％〜90％としたのは、50％以下では該ゴム層の容量が
不足しがちで剛性不足を招くからである。The inner end of the soft rubber layer 12 has a bead folding part 8
It is fitted and joined to the constricted portion 11A on the inner side thereof to be integrated, and extends in a radially outward direction in a wedge shape. here,
The height HI of the hard rubber layer 11 is the height H of the bead filler 6
The reason why the content is 50% to 90% is that if the content is 50% or less, the capacity of the rubber layer tends to be insufficient, resulting in insufficient rigidity.
【００１３】また、くびれ部11A において、フィラーゲ
ージ厚さa の40〜60％の半径b としたのは、40％以下で
はソフトゴム層12によるコード折返部8 の端末8Aの躍り
によるクラック発生を防止するのが困難であり、一方、
60％以上であれば、延伸部11B による剛性確保が充分で
ないからである。図１(C) は本発明の第２実施例を示し
ており、硬度の高い摩滅防止用のラバーチェーファー13
を備え、該チェーファー13よりも硬度が低くかつスチー
ルコード(コード折返部) との接着力の強いゴムよりな
る緩和層14を、コード端末8Aの径方向内外でかつソフト
ゴム層12の外側に接合一体化したものであり、この際、
緩和層14のゲージはサイドウォールゲージC の30％以上
とされて端末8Aの動きをソフトゴム層12と相まって緩和
している。Further, in the constricted portion 11A, the radius b of 40 to 60% of the filler gauge thickness a is set to be 40% or less so that the crack generation due to the jump of the terminal 8A of the cord folding portion 8 by the soft rubber layer 12 occurs. Hard to prevent, while
This is because if it is 60% or more, the rigidity of the stretched portion 11B cannot be secured sufficiently. FIG. 1 (C) shows a second embodiment of the present invention, in which a rubber chafer 13 having high hardness for preventing abrasion is used.
And a relaxation layer 14 made of rubber having hardness lower than that of the chafer 13 and having a strong adhesive force with a steel cord (cord folding portion) is provided inside and outside the radial direction of the cord terminal 8A and outside the soft rubber layer 12. It is a joint and integrated, at this time,
The gauge of the relaxation layer 14 is set to be 30% or more of the sidewall gauge C, and the movement of the terminal 8A is mitigated together with the soft rubber layer 12.
【００１４】また、図２は本発明の第３実施例を示し、
弯曲状のくびれ部11A の径内側は径内方向に延びてお
り、その他は第１実施例と共通するので共通部分に共通
符号で示している。以上のように構成したラジアルタイ
ヤ1 を自動車 (トラック、バス等) のリム10に嵌着して
使用するとき、横剛性に対してはビードコアー5 上に配
したハードゴム層11の基部で充分に確保し、くびれ部11
A はコード端末8Aと対応してこのくびれ部11A から径外
方向の薄膜状の延伸部11B を有することからしても、ハ
ードゴム層11の容量は十分となって横剛性は充分とな
る。FIG. 2 shows a third embodiment of the present invention,
The inner side of the curved constricted portion 11A extends in the inner radial direction, and the other portions are common to the first embodiment, and therefore common parts are designated by common reference numerals. When the radial tire 1 configured as described above is used by being fitted to the rim 10 of an automobile (truck, bus, etc.), lateral rigidity is sufficiently secured by the base of the hard rubber layer 11 arranged on the bead core 5. And waist 11
Even if A has a thin film-shaped extending portion 11B radially outward from the constricted portion 11A corresponding to the cord terminal 8A, the capacity of the hard rubber layer 11 is sufficient and the lateral rigidity is also sufficient.
【００１５】一方、コード折返部8 の端末8Aに集中する
応力は弯曲状のくびれ部11A に嵌合したソフトゴム層12
によって緩和し、ここに、端末8Aによるセパレーショ
ン、層間剥離等を防止する。また、ハードゴム層11を採
用することにより、タイヤ成形後の未加硫タイヤ (グリ
ーンタイヤ) において加硫待ちでしばらく放置した際、
ビード部がその自重によって撓みシワができ加硫時にエ
アー入り等の不良を招くのを、防止することもできる。On the other hand, the stress concentrated on the terminal 8A of the cord folding portion 8 is the soft rubber layer 12 fitted to the curved constricted portion 11A.
And the separation by the terminal 8A, delamination and the like are prevented. Further, by adopting the hard rubber layer 11, when the unvulcanized tire (green tire) after tire molding is left for a while waiting for vulcanization,
It is also possible to prevent the bead portion from bending and wrinkling due to its own weight and causing defects such as air entering during vulcanization.
【００１６】[0016]
【発明の効果】本発明は以上の通りであり、本発明によ
れば一対のビードコア5 上のそれぞれに位置された硬度
の高いハードゴム層11と該ゴム層11の径外側に一体化さ
れた硬度の低いソフトゴム層12とからなるビードフィラ
ー6 を備え、ラジアルカーカスコード7 の両端部をビー
ドトゥ側からビードコア5 を囲んでビードヒールに向っ
て折返されたコード折返部8 を備えているラジアルタイ
ヤにおいて、前記ハードゴム層11は、タイヤ外面側でコ
ード折返部8 の端末8Aと対応する位置にタイヤ内面側に
向って弯曲状のくびれ部11A を有し、かつ、該くびれ部
11Aを介してタイヤ内面側において径方向外方に延伸し
た厚さの漸減する延伸部11Bを有し、前記ソフトゴム層1
2の径内端はコード折返部8 と対応する前記くびれ部11A
に嵌合配置されてハードゴム層11に一体的に接合され
て前記延伸部11B とともに径外方延伸されているので、
ビードフィラー6 の剛性向上とコード折返部8における
端末8Aの動きを防止乃至抑制してビード部の耐久性及び
車の操安性を確保しつつタイヤ重量の軽減ができる。The present invention is as described above. According to the present invention, a hard rubber layer 11 having a high hardness located on each of a pair of bead cores 5 and a hardness integrated on the radially outer side of the rubber layer 11 are integrated. A radial tire having a bead filler 6 consisting of a low soft rubber layer 12 and a cord folding part 8 that is folded around both ends of the radial carcass cord 7 from the bead toe side around the bead core 5 toward the bead heel. The hard rubber layer 11 has a curved constricted portion 11A toward the tire inner surface side at a position corresponding to the end 8A of the cord folding portion 8 on the tire outer surface side, and the constricted portion is formed.
The soft rubber layer 1 has a stretched portion 11B that gradually extends in the radial direction outwardly on the tire inner surface side via 11A.
The inner end of 2 has the constricted portion 11A corresponding to the cord folding portion 8
Since it is fitted to the hard rubber layer 11 and integrally joined to the hard rubber layer 11 and is radially outwardly extended together with the extending portion 11B,
The tire weight can be reduced while improving the rigidity of the bead filler 6 and preventing or suppressing the movement of the terminal 8A in the cord turning portion 8 while ensuring the durability of the bead portion and the steering stability of the vehicle.
【図１】本発明の実施例を示し、(A) は全体構成の概念
図、(B) は第１実施例の要部拡大図、(C) は第２実施例
の要部拡大図である。FIG. 1 shows an embodiment of the present invention, (A) is a conceptual diagram of the overall configuration, (B) is an enlarged view of an essential part of the first embodiment, and (C) is an enlarged view of an essential part of the second embodiment. is there.
【図２】本発明の第３実施例を示す要部拡大図である。FIG. 2 is an enlarged view of an essential part showing a third embodiment of the present invention.
1 ラジアルタイヤ 5 ビードコア 6 ビードフィラー 7 カーカス 8 コード折返部 8A 端末 11 ハードゴム層 11A くびれ部 11B 延伸部 12 ソフトゴム層 1 Radial tire 5 Bead core 6 Bead filler 7 Carcass 8 Cord folding section 8A Terminal 11 Hard rubber layer 11A Constriction section 11B Stretching section 12 Soft rubber layer
Claims (1)
置された硬度の高いハードゴム層(11)と該ゴム層(11)の
径外側に一体化された硬度の低いソフトゴム層(12)とか
らなるビードフィラー(6) を備え、ラジアルカーカスコ
ード(7) の両端部をビードトゥ側からビードコア(5) を
囲んでビードヒールに向って折返されたコード折返部
(8) を備えているラジアルタイヤにおいて、 前記ハードゴム層(11)は、タイヤ外面側でコード折返部
(8) の端末(8A)と対応する位置にタイヤ内面側に向って
弯曲状のくびれ部(11A) を有し、かつ、該くびれ部(11
A) を介してタイヤ内面側において径方向外方に延伸し
た厚さの漸減する延伸部(11B) を有し、前記ソフトゴム
層(12)の径内端はコード折返部(8) と対応する前記くび
れ部(11A) に嵌合配置されてハードゴム層(11)に一体的
に接合されて前記延伸部(11B) とともに径外方延伸され
ていることを特徴とするラジアルタイヤ。1. A hard rubber layer (11) having a high hardness located on each of a pair of bead cores (5) and a soft rubber layer (12) having a low hardness integrated on the radially outer side of the rubber layer (11). With a bead filler (6) consisting of and, the cord wrapping part that is folded from both sides of the radial carcass cord (7) around the bead core (5) from the bead toe side toward the bead heel.
In the radial tire including (8), the hard rubber layer (11) has a cord folding portion on the tire outer surface side.
(8) The terminal (8A) has a curved constricted part (11A) toward the inner surface of the tire at a position corresponding to the end (8A), and the constricted part (11
A) has a stretched portion (11B) that gradually extends in the radial direction outwardly on the tire inner surface side via A), and the inner diameter end of the soft rubber layer (12) corresponds to the cord folding portion (8). A radial tire fitted to the constricted portion (11A), integrally bonded to the hard rubber layer (11), and radially outwardly stretched together with the stretched portion (11B).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15831192A JPH061124A (en) | 1992-06-17 | 1992-06-17 | Radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15831192A JPH061124A (en) | 1992-06-17 | 1992-06-17 | Radial tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH061124A true JPH061124A (en) | 1994-01-11 |
Family
ID=15668862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15831192A Pending JPH061124A (en) | 1992-06-17 | 1992-06-17 | Radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH061124A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5634995A (en) * | 1993-01-27 | 1997-06-03 | Sumitomo Rubber Industries, Ltd. | Radial tire for heavy load and having 80% or lower aspect ratio |
| US5669994A (en) * | 1994-08-26 | 1997-09-23 | Bridgestone Corporation | Pneumatic radial tires with one-piece molded stiffener having at least two rubber compositions of different hardness |
| US6000452A (en) * | 1996-10-15 | 1999-12-14 | Toyo Tire & Rubber Co., Ltd. | Pneumatic radial tire for heavy load with rubber filler comprising hard rubber filler and soft rubber filler |
| JP2007230400A (en) * | 2006-03-01 | 2007-09-13 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2008037314A (en) * | 2006-08-08 | 2008-02-21 | Sumitomo Rubber Ind Ltd | Heavy duty tire |
-
1992
- 1992-06-17 JP JP15831192A patent/JPH061124A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5634995A (en) * | 1993-01-27 | 1997-06-03 | Sumitomo Rubber Industries, Ltd. | Radial tire for heavy load and having 80% or lower aspect ratio |
| US5669994A (en) * | 1994-08-26 | 1997-09-23 | Bridgestone Corporation | Pneumatic radial tires with one-piece molded stiffener having at least two rubber compositions of different hardness |
| US6000452A (en) * | 1996-10-15 | 1999-12-14 | Toyo Tire & Rubber Co., Ltd. | Pneumatic radial tire for heavy load with rubber filler comprising hard rubber filler and soft rubber filler |
| JP2007230400A (en) * | 2006-03-01 | 2007-09-13 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2008037314A (en) * | 2006-08-08 | 2008-02-21 | Sumitomo Rubber Ind Ltd | Heavy duty tire |
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