JPH06106925A - Pneumatic radial tire - Google Patents

Pneumatic radial tire

Info

Publication number
JPH06106925A
JPH06106925A JP4260119A JP26011992A JPH06106925A JP H06106925 A JPH06106925 A JP H06106925A JP 4260119 A JP4260119 A JP 4260119A JP 26011992 A JP26011992 A JP 26011992A JP H06106925 A JPH06106925 A JP H06106925A
Authority
JP
Japan
Prior art keywords
bead
end edge
rubber
abrasion
diametric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP4260119A
Other languages
Japanese (ja)
Other versions
JP3121453B2 (en
Inventor
Kuniaki Ito
邦明 伊藤
Keizo Shibano
圭三 芝野
Hiroshi Minekawa
弘志 峰川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ohtsu Tire and Rubber Co Ltd
Original Assignee
Ohtsu Tire and Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ohtsu Tire and Rubber Co Ltd filed Critical Ohtsu Tire and Rubber Co Ltd
Priority to JP04260119A priority Critical patent/JP3121453B2/en
Publication of JPH06106925A publication Critical patent/JPH06106925A/en
Application granted granted Critical
Publication of JP3121453B2 publication Critical patent/JP3121453B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To improve durability of a bead part by setting ratio of section length between a riseup part end edge of abrasion rubber and a fiber reinforced layer to section length between a foldback part diametric external end edge and an external surface of a side rubber material to a specific value, and arranging this riseup part end edge in a diametric inside from the foldback part diametric external end edge. CONSTITUTION:An end part of a radial carcass layer 9 is folded back from the inside to the outside around a bead core 5, to form a foldback part 10, and a fiber reinforced layer 11 is buried in a side rubber material 12 containing a bead part between the foldback part 10 and a riseup part 7 of abrasion rubber 8. Section length A between an end edge 7A of the riseup part 7 of the abrasion rubber 8 and the fiber reinforced layer 11 and section length B between an diametric external end edge 10A of the foldback part 10 and an external surface of the side rubber material 12 are set to a relation where A/B > =1/3, and also the end edge 7A of the riseup part 7 in the abrasion rubber 8 is positioned in a diametric inside relating to the diametric external end edge 10A of the foldback part 10. In this way, durability of the bead part can be improved.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、空気入りラジアルタイ
ヤに係り、トラック、バス等の重荷重用に利用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic radial tire and is used for heavy loads such as trucks and buses.

【０００２】[0002]

【従来の技術】この種の空気入りラジアルタイヤとし
て、図３に示すものがある。図３において、1 はタイヤ
リムであり、リムベース部2 とリムフランジ部3 を備
え、このタイヤリム1 に空気入りラジアルタイヤのビー
ド部4 が嵌合されている。2. Description of the Related Art A pneumatic radial tire of this type is shown in FIG. In FIG. 3, reference numeral 1 denotes a tire rim, which includes a rim base portion 2 and a rim flange portion 3, and a bead portion 4 of a pneumatic radial tire is fitted to the tire rim 1.

【０００３】ビード部4 には六角ビードワイヤー等より
なるビードコア5 が埋設されているとともに、リムベー
ス部2 に沿う着座部6 とリムフランジ部3 に沿う立上り
部7とからなる断面略Ｌ字形のアブレージョンゴム8 が
ビード部4 の外周に一体に備えてある。9 はカーカス層
であり、ラジアル方向に延びるスチールコードが埋設さ
れた少なくとも１枚のカーカスプライからなり、その端
部は、ビードコア5 の回りに内側から外側に向って折返
されて径外方向に延びる折返し部10に形成され、その径
外端縁10A はハイ・ターンナップ構造とされている。A bead core 5 made of a hexagonal bead wire or the like is embedded in the bead portion 4, and an abrasion having a substantially L-shaped cross section composed of a seat portion 6 along the rim base portion 2 and a rising portion 7 along the rim flange portion 3. A rubber 8 is integrally provided on the outer circumference of the bead portion 4. Reference numeral 9 denotes a carcass layer, which is composed of at least one carcass ply in which a steel cord extending in the radial direction is buried, and its end portion is folded back from the inside toward the outside around the bead core 5 and extends in the radial outside direction. The folded-back portion 10 is formed, and its radially outer edge 10A has a high turn-up structure.

【０００４】11はナイロン等よりなる外側繊維補強層で
あり、前記折返し部10とアブレージョンゴム8 の立上り
部7 との間でビード部4 を含むサイドゴム質12に図では
２枚埋設され、折返し部10の径外端縁10A を越えて径外
方向に延伸されている。その他、図において、13は内側
繊維補強層、14はＵ型ロング・ターンナップ強化された
スチール補強層、15はビードフイラーを示し、第１フイ
ラー15A と第２フイラー15B よりなっている。Reference numeral 11 is an outer fiber reinforcing layer made of nylon or the like, and two sheets are embedded in the side rubber material 12 including the bead portion 4 between the folded portion 10 and the rising portion 7 of the abrasion rubber 8 in the figure, and the folded portion is formed. It is extended in the radial direction beyond the radial outer edge 10A. In addition, in the figure, 13 is an inner fiber reinforcing layer, 14 is a U-shaped long turn-up reinforced steel reinforcing layer, and 15 is a bead filler, which is composed of a first filler 15A and a second filler 15B.

【０００５】[0005]

【発明が解決しようとする課題】前述した従来技術にお
けるタイヤを車両に装着して使用する場合、路面からの
力が折返し部10および外側補強層11に対して径内方向に
作用し、アブレージョンゴム8 の立上り部7 はリムフラ
ンジ部3 より径外方向に延伸し、かつ、折返し部10の端
縁10A よりも径外位置にあることから、前記径内方向に
作用する力に基づく剪断力を緩和する部分が少ないこと
によって補強層11の付近に剥離、クラック等が発生し易
いものであった。When the tire according to the above-mentioned conventional technique is mounted on a vehicle and used, a force from the road surface acts on the folded-back portion 10 and the outer reinforcing layer 11 in the radial direction, and the abrasion rubber is used. Since the rising portion 7 of 8 extends radially outward from the rim flange portion 3 and is located radially outward from the end edge 10A of the folded portion 10, the shearing force based on the force acting in the radial direction is applied. Since there were few relaxing portions, peeling, cracks and the like were likely to occur in the vicinity of the reinforcing layer 11.

【０００６】実際、ドラムによる耐久テストの結果、特
に、補強層11付近での故障が平均404 時間において発生
した。そこで、本発明は、補強層とアブレージョンゴム
の立上り部との間に働く剪断力を緩和することにより、
ビード強化構造を完遂したことを目的とする。In fact, as a result of the durability test with the drum, the failure near the reinforcing layer 11 occurred on average for 404 hours. Therefore, the present invention, by relaxing the shearing force acting between the reinforcing layer and the rising portion of the abrasion rubber,
The purpose is to complete the bead strengthening structure.

【０００７】[0007]

【課題を解決するための手段】本発明は、リムベース部
2 に沿う着座部6 とリムフランジ部3 に沿う立上り部7
とからなる断面略Ｌ字形のアブレージョンゴム8 を、ビ
ードコア5 を埋設したビード部4 に備え、ラジアルカー
カス層9 の端部を、前記ビードコア5 の回りに内側から
外側に折返して径外方向に延伸する折返し部10を形成
し、該折返し部10と前記アブレージョンゴム8 の立上り
部7 間のビード部4 を含むサイドゴム質12に繊維補強層
11を埋設し、該繊維補強層11は、前記折返し部10の径外
端縁10A を越えて径外方向に延伸されている空気入りラ
ジアルタイヤであって、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。SUMMARY OF THE INVENTION The present invention is a rim base portion.
Seat 6 along 2 and stand-up 7 along rim flange 3
An abrasion rubber 8 having a substantially L-shaped cross section consisting of and is provided in the bead portion 4 in which a bead core 5 is embedded, and the end portion of the radial carcass layer 9 is folded back from the inside to the outside around the bead core 5 and extends radially outward. And a fiber reinforcement layer on the side rubber material 12 including the bead portion 4 between the folding portion 10 and the rising portion 7 of the abrasion rubber 8.
11 is embedded, the fiber reinforcing layer 11 is a pneumatic radial tire extending radially outward beyond the radially outer edge 10A of the folded portion 10, in order to achieve the above-mentioned object,
The following technical measures are taken.

【０００８】すわち、本発明は、前記アブレージョンゴ
ム8 における立上り部7 の端縁7Aと繊維補強層11との間
の断面長さＡと、前記折返し部10の径外端縁10A とサイ
ドゴム質12の外表面との間の断面長さＢを、Ａ／Ｂ≧1/
3 とするとともに、前記アブレージョンゴム8 における
立上り部7 の端縁7Aを、前記折返し部10の径外端縁10A
に対して径内側に位置させていることを特徴とするもの
である。That is, according to the present invention, the cross-sectional length A between the edge 7A of the rising portion 7 and the fiber reinforcing layer 11 in the abrasion rubber 8, the outer diameter edge 10A of the folded portion 10 and the side rubber material. The cross-sectional length B between the outer surface of 12 and A / B ≧ 1 /
3 and the edge 7A of the rising portion 7 of the abrasion rubber 8 is the outer radial edge 10A of the folded portion 10.
It is characterized in that it is located radially inward of.

【０００９】[0009]

【作用】本発明によれば、径内方向に作用する力による
剪断力はＡ／Ｂ≧1/3 としたこにより、Ｂ部分による緩
和層で抑えられる。According to the present invention, the shearing force due to the force acting in the radial direction is set to A / B ≧ 1/3, so that it is suppressed by the relaxation layer due to the B portion.

【００１０】[0010]

【実施例】以下、図１〜２を参照して本発明に係るラジ
アルタイヤＴの実施例を説明する。なお、図３で既述し
た構成と共通する部分は共通符号で示し、また、図では
一方のビード部のみを示しているが、他方のビード部も
対称形状である。図１で示す如くアブレージョンゴム8
は100 ％伸張モジュラスが32〜60kg/cm2の耐リムずれ性
の良好なゴムから構成されていて、その立上り部7 は実
質的にリムフランジ部3 の厚みと略同じ程度の厚みとさ
れているとともに、該立上り部7の端縁7Aと外側繊維補
強層11との間の断面長さＡと、カーカス層9 における折
返し部10の径外端9Aとサイドゴム質12の外表面との間の
断面長さＢを、Ａ／Ｂ≧1/3 とされ、更に、アブレージ
ョンゴム8 における立上り部7 の端縁7Aは実質的にリム
フランジ部3 のカール部で終っていて半径位置Ｃにあ
り、折返し部10の径外端縁10A の半径位置Ｄよりも低
い、すなわち、径内位置にあって、ここに、サイドゴム
質12の部分において、径内方向に作用する力に基づく剪
断力を充分に緩和する緩和層12A を形成している。EXAMPLES Examples of the radial tire T according to the present invention will be described below with reference to FIGS. It should be noted that portions common to the configuration described in FIG. 3 are indicated by common reference numerals, and although only one bead portion is shown in the drawing, the other bead portion is also symmetrical. Abrasion rubber 8 as shown in FIG.
Is made of rubber with a 100% elongation modulus of 32 to 60 kg / cm 2 and good rim displacement resistance, and its rising portion 7 is substantially the same thickness as the rim flange portion 3. In addition, the cross-sectional length A between the edge 7A of the rising portion 7 and the outer fiber reinforcing layer 11, and between the outer diameter end 9A of the folded portion 10 of the carcass layer 9 and the outer surface of the side rubber substance 12 are The sectional length B is A / B ≧ 1/3, and further, the edge 7A of the rising portion 7 of the abrasion rubber 8 substantially ends at the curl portion of the rim flange portion 3 and is at the radial position C, It is lower than the radial position D of the radially outer end edge 10A of the folded portion 10, that is, at the radially inner position, where the side rubber material 12 has a sufficient shearing force based on the force acting in the radially inward direction. A relaxing layer 12A for relaxing is formed.

【００１１】ビードコア5 は耐熱コンパランド処理され
ており、第１ビードフイラ15A は高モジュラス (100 ％
伸張時のモジュラスが70〜100kg/cm2)のゴムからなり、
一方、第２ビードフイラ15B は比較的低モジュラス(100
％伸張時のモジュラスが16〜28kg/cm2) とされている。
図２に示した第２実施例では、図１に示した第１実施例
のタイヤＴにおいて、内側繊維補強層13を省略するとと
もに、スチール補強層14の断面高さを低くしたものであ
り、その他は第１実施例と共通する。The bead core 5 is heat-resistant comparand treated, and the first bead filler 15A has a high modulus (100%).
Made of rubber with a modulus of 70 to 100 kg / cm 2 when stretched,
On the other hand, the second bead filler 15B has a relatively low modulus (100
The modulus at% elongation is said to be 16 to 28 kg / cm 2 ).
In the second embodiment shown in FIG. 2, in the tire T of the first embodiment shown in FIG. 1, the inner fiber reinforcing layer 13 is omitted, and the steel reinforcing layer 14 has a low sectional height. Others are common to the first embodiment.

【００１２】斯る第１実施例に係るタイヤＴについて
(タイヤの種類は1000R20)、ドラムによる耐久テストを
実施した処、外側繊維補強層11の付近においての剪断力
によるセパレーション等の故障は平均701 時間で発生
し、従来例のそれよりも 1.7倍、つまり、約70％ビード
部の耐久性が向上したのが実証された。Regarding the tire T according to the first embodiment
(The type of tire is 1000R20) .After a durability test with a drum, failures such as separation due to shearing force in the vicinity of the outer fiber reinforcement layer 11 occurred on average 701 hours, 1.7 times more than that of the conventional example. In other words, it was proved that the durability of the bead part was improved by about 70%.

【００１３】[0013]

【発明の効果】本発明は以上の通りであり、空気入りラ
ジアルタイヤにおいて、ビード部において緩和層を充分
に確保することにより、剪断力を緩和してその耐久性を
大幅に向上することができる。The present invention is as described above, and in the pneumatic radial tire, by sufficiently securing the relaxation layer in the bead portion, the shearing force can be relaxed and the durability thereof can be greatly improved. .

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

【図１】本発明の第１実施例を示すタイヤの断面図と要
部の拡大図である。FIG. 1 is a cross-sectional view of a tire showing a first embodiment of the present invention and an enlarged view of essential parts.

【図２】第２実施例を示す断面図である。FIG. 2 is a sectional view showing a second embodiment.

【図３】従来例の断面図である。FIG. 3 is a sectional view of a conventional example.

【符号の説明】[Explanation of symbols]

Ｔ タイヤ １ リム ２ リムベース部 ３ リムフランジ部 ４ ビード部 ５ ビードコア ６ リム着座部 ７ 立上り部 ８ アブレージョンゴム ９ カーカス層 10 折返し部 7A 立上り部端縁 10A 折返し部端縁 T tire 1 rim 2 rim base part 3 rim flange part 4 bead part 5 bead core 6 rim seating part 7 rising part 8 abrasion rubber 9 carcass layer 10 folding part 7A rising part edge 10A folding part edge

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 リムベース部(2) に沿う着座部(6) とリ
ムフランジ部(3) に沿う立上り部(7) とからなる断面略
Ｌ字形のアブレージョンゴム(8) を、ビードコア(5) を
埋設したビード部(4) に備え、ラジアルカーカス層(9)
の端部を、前記ビードコア(5) の回りに内側から外側に
折返して径外方向に延伸する折返し部(10)を形成し、該
折返し部(10)と前記アブレージョンゴム(8) の立上り部
(7) 間のビード部(4) を含むサイドゴム質(12)に繊維補
強層(11)を埋設し、該繊維補強層(11)は、前記折返し部
(10)の径外端縁(10A) を越えて径外方向に延伸されてい
る空気入りラジアルタイヤであって、 前記アブレージョンゴム(8) における立上り部(7) の端
縁(7A)と繊維補強層(11)との間の断面長さ (Ａ) と、前
記折返し部(10)の径外端縁(10A) とサイドゴム質(12)の
外表面との間の断面長さ (Ｂ) を、 (Ａ) ／ (Ｂ) ≧1/
3 とするとともに、前記アブレージョンゴム(8) におけ
る立上り部(7) の端縁(7A)を、前記折返し部(10)の径外
端縁(10A) に対して径内側に位置させていることを特徴
とする空気入りラジアルタイヤ。1. An abrasion rubber (8) having a substantially L-shaped cross section, which comprises a seating portion (6) along the rim base portion (2) and a rising portion (7) along the rim flange portion (3), and a bead core (5). The radial carcass layer (9) is prepared for the bead part (4) embedded with
An end portion of the bead core (5) is folded back from the inner side to the outer side to form a folded portion (10) extending radially outward, and the folded portion (10) and the rising portion of the abrasion rubber (8).
A fiber reinforcing layer (11) is embedded in the side rubber material (12) including the bead portion (4) between (7), and the fiber reinforcing layer (11) is the folded portion.
A radial radial tire extending radially outward beyond the outer edge (10A) of (10), wherein the edge (7A) of the rising portion (7) of the abrasion rubber (8) and the fiber The cross-sectional length (A) between the reinforcing layer (11) and the radial outer edge (10A) of the folded portion (10) and the outer surface of the side rubber material (12) (B) And (A) / (B) ≧ 1 /
3, and the edge (7A) of the rising portion (7) in the abrasion rubber (8) is positioned radially inward with respect to the radially outer edge (10A) of the folded portion (10). Pneumatic radial tire featuring.
JP04260119A 1992-09-29 1992-09-29 Pneumatic radial tire Expired - Fee Related JP3121453B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04260119A JP3121453B2 (en) 1992-09-29 1992-09-29 Pneumatic radial tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04260119A JP3121453B2 (en) 1992-09-29 1992-09-29 Pneumatic radial tire

Publications (2)

Publication Number Publication Date
JPH06106925A true JPH06106925A (en) 1994-04-19
JP3121453B2 JP3121453B2 (en) 2000-12-25

Family

ID=17343555

Family Applications (1)

Application Number Title Priority Date Filing Date
JP04260119A Expired - Fee Related JP3121453B2 (en) 1992-09-29 1992-09-29 Pneumatic radial tire

Country Status (1)

Country Link
JP (1) JP3121453B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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
JP2015134587A (en) * 2014-01-20 2015-07-27 住友ゴム工業株式会社 Pneumatic tire
JP2015150921A (en) * 2014-02-12 2015-08-24 住友ゴム工業株式会社 pneumatic tire

Cited By (3)

* Cited by examiner, † Cited by third party
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
JP2015134587A (en) * 2014-01-20 2015-07-27 住友ゴム工業株式会社 Pneumatic tire
JP2015150921A (en) * 2014-02-12 2015-08-24 住友ゴム工業株式会社 pneumatic tire

Also Published As

Publication number Publication date
JP3121453B2 (en) 2000-12-25

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