JPH03253412A - Radial tire for heavy load - Google Patents

Radial tire for heavy load

Info

Publication number
JPH03253412A
JPH03253412A JP2052968A JP5296890A JPH03253412A JP H03253412 A JPH03253412 A JP H03253412A JP 2052968 A JP2052968 A JP 2052968A JP 5296890 A JP5296890 A JP 5296890A JP H03253412 A JPH03253412 A JP H03253412A
Authority
JP
Japan
Prior art keywords
stiffener
hard
soft
radial tire
bead
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
JP2052968A
Other languages
Japanese (ja)
Other versions
JP2945432B2 (en
Inventor
Namihito Aoki
青木　波人
Hidetoshi Yoda
秀敏 依田
Takeshi Nakamura
武 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP5296890A priority Critical patent/JP2945432B2/en
Publication of JPH03253412A publication Critical patent/JPH03253412A/en
Application granted granted Critical
Publication of JP2945432B2 publication Critical patent/JP2945432B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
    • B60C15/0607—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex comprising several parts, e.g. made of different rubbers

Landscapes

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

Abstract

PURPOSE:To improve the durability of a bead part by protruding the tread side of the parting line of hard and soft stiffeners to the hard stiffener side, and also projecting a bead wire side to the soft stiffener side. CONSTITUTION:A parting line 22, in the tire meridian cross section of a soft stiffener 18 and a hard stiffener 20, is wavelikely formed as a whole by arcedly protruding a tread side toward the bard stiffener 20 side to a position M of 40-60% from the end 22A of the length L of a straight line connecting both the ends 22A and 22B of the parting line 22, and arcedly projecting a beat wire 14 side toward the soft stiffener 18 side. This constitution permits the retention of an interval between a ply end and the hard stiffener 20 at a prescribed value or more to the stiffener distortion due to traveling to reduce ply end distortion to improve the durability of a bead part.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、重荷重用ラジアルタイヤに係り、特にビード
部にステイフナ−を有する重荷重用ラジアルタイヤに関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a radial tire for heavy loads, and particularly to a radial tire for heavy loads having a stiffener in the bead portion.

［従来の技術］ 一般に、重荷重用ラジアルタイヤのカーカスプライとそ
の折返し端部とにより囲まれる断面形状が略三角形の区
域内には、ビード部に高い剛性を保つと共に、サイドウ
オール部がうける繰返し応力をスムーズにビード部へ伝
達するための、ステイフナ−が配置されている。[Prior Art] Generally, in a region of a heavy-duty radial tire that has a substantially triangular cross-sectional shape surrounded by the carcass ply and its folded end, high rigidity is maintained in the bead part, and repetitive stress applied to the sidewall part is maintained. A stiffener is installed to smoothly transmit the flow to the bead.

第４図に示される如く、従来の重荷重用ラジアルタイヤ
５０のステイフナ−５２はトレッド側（第４図の上側）
が軟ステイフナ−５６とされ、ビードワイヤ５８側（第
４図下側）が硬ステイフナ−６０とされており、タイヤ
軸線に沿って切断したタイヤ子午線断面において、軟ス
テイフナ−５６と硬ステイフナ−６０との分割線６２は
略直線とされ、分割線６２のトレッド側端６２Ａはカー
カスプライ６４のプライエンド６４Ａ近傍のボデープラ
イ６４Ｂへ至っている。As shown in FIG. 4, the stiffener 52 of the conventional heavy-duty radial tire 50 is located on the tread side (upper side in FIG. 4).
is the soft stiffener 56, and the bead wire 58 side (lower side in Figure 4) is the hard stiffener 60. In the tire meridian cross section cut along the tire axis, the soft stiffener 56 and the hard stiffener 60 are separated. The dividing line 62 is substantially straight, and the tread side end 62A of the dividing line 62 reaches the body ply 64B near the ply end 64A of the carcass ply 64.

しかしながら、この重荷重用ラジアルタイヤ５０におい
ては、走行時にサイドウオール部６′８がうける繰返し
応力によって、ボデープライ６４Ｂが矢印Ｆ方向へ引っ
張られる。このため、第４図の仮想線６６に示される如
く、分割線６２のトレッド側が軟ステイフナー５６側へ
突出し、この反力としてビードワイヤ５８側が硬ステイ
フナー６０側へ突出する。However, in this heavy-load radial tire 50, the body ply 64B is pulled in the direction of arrow F due to repeated stress applied to the sidewall portion 6'8 during running. Therefore, as shown by an imaginary line 66 in FIG. 4, the tread side of the parting line 62 protrudes toward the soft stiffener 56, and as a reaction force, the bead wire 58 side protrudes toward the hard stiffener 60.

従って、プライエンド６４Ａと硬ステイフナ−６０との
隙間Ｔが狭くなり、プライエンド６４Ａ近傍にセパレー
ションが発生し易くなるため、ビード部の耐久性が低下
するという不具合があった。Therefore, the gap T between the ply end 64A and the hard stiffener 60 is narrowed, and separation is likely to occur near the ply end 64A, resulting in a problem that the durability of the bead portion is reduced.

［発明が解決しようとする課題］ 本発明は上記事実を考慮し、ビード部の耐久性を向上す
ることができる重荷重用ラジアルタイヤを提供すること
が目的である。[Problems to be Solved by the Invention] In consideration of the above facts, an object of the present invention is to provide a heavy-load radial tire that can improve the durability of the bead portion.

［課題を解決するための手段］ 上記目的を達成するため請求項（１）記載の本発明では
、金属コードよりなる少な（とも＝枚のカーカスプライ
と、一対のビードワイヤと、トレッド側が軟ステイフナ
−とされビードワイヤ側が硬ステイフナ−とされると共
にタイヤ子午線断面において前記軟ステイフナ−と前記
硬ステイフナ−との分割線のトレッド側端がプライエン
ド近傍のボデープライに至るステイフナ−と、を有する
重荷重用ラジアルタイヤであって、前記分割線のトレッ
ド側が前記硬ステイフナー側へ突出すると共に前記分割
線のビードワイヤ側が前記軟ステイフナー側へ突出した
ことを特徴としている。[Means for Solving the Problems] In order to achieve the above object, the present invention as set forth in claim (1) includes a carcass ply made of a metal cord, a pair of bead wires, and a soft stiffener on the tread side. A radial tire for heavy loads, the stiffener having a hard stiffener on the bead wire side, and a stiffener whose tread side end of a dividing line between the soft stiffener and the hard stiffener reaches a body ply near the ply end in the tire meridian cross section. The tread side of the parting line projects toward the hard stiffener, and the bead wire side of the parting line projects toward the soft stiffener.

また、請求項（２）記載の本発明では、前記分割線の各
突出位置が前記分割線の両端を結ぶ結線の端からこの結
線の長さの４０％〜６０％の位置にあることを特徴とし
ている。Further, the present invention according to claim (2) is characterized in that each protruding position of the dividing line is located at a position of 40% to 60% of the length of the connecting line from the end of the connecting line connecting both ends of the dividing line. It is said that

また、請求項（３）記載の本発明では、前記分割線の各
突出部と前記結線との間に形成される前記硬ステイフナ
−の凹部及び凸部の各断面積が前記硬ステイフナ−の全
断面積の５％〜１５％であることを特徴としている。Further, in the present invention as set forth in claim (3), each cross-sectional area of the concave portion and the convex portion of the hard stiffener formed between each protrusion of the dividing line and the wire connection is equal to or less than the entire cross-sectional area of the hard stiffener. It is characterized by being 5% to 15% of the cross-sectional area.

［作用］ 走行時に重荷重用ラジアルタイヤへ車両等の荷重が作用
すると、ステイフナ−の硬ステイフナ−と軟ステイフナ
−との分割線の形状変化は、次のようになる。[Function] When a load from a vehicle or the like acts on a heavy-duty radial tire during running, the shape of the dividing line between the hard stiffener and the soft stiffener changes as follows.

即ち、硬ステイフナ−はタイヤ幅方向内側のカーカスプ
ライ、所謂ボディプライに沿うようしてトレッド側へ押
し出される。一方、軟ステイフナ−は折り返しプライに
沿うようにしてビードワイヤ側へ押し出される。That is, the hard stiffener is pushed out toward the tread side along the inner carcass ply in the width direction of the tire, the so-called body ply. On the other hand, the soft stiffener is pushed out toward the bead wire along the folded ply.

従って、このステイフナ−の硬ステイフナ−と軟ステイ
フナ−との分割線の形状変化を予め考慮し、分割線のト
レッド側が硬ステイフナー側へ突出すると共に、分割線
のビードワイヤ側が軟ステイフナー側へ突出した形状と
することで、走行時に重荷重用ラジアルタイヤへ車両等
の荷重が作用し、分割線のトレッド側が軟ステイフナー
側へ移動して、その反力として分割線のビードワイヤ側
が硬ステイフナー側へ移動した場合には、分割線の形状
変化が結線と近い直線状となる。このため、走行による
ステイフナ−の歪みに対してプライエンドと硬ステイフ
ナ−との間隔を一定値以上に保つことができるため、プ
ライエンド歪みを低減でき、ビード部の耐久性を向上す
ることができる。Therefore, considering in advance the shape change of the dividing line between the hard stiffener and the soft stiffener, the tread side of the dividing line protrudes toward the hard stiffener, and the bead wire side of the dividing line protrudes toward the soft stiffener. By doing so, when the load of the vehicle, etc. acts on the heavy-duty radial tire while driving, the tread side of the parting line moves towards the soft stiffener side, and as a reaction force, the bead wire side of the parting line moves towards the hard stiffener side. In this case, the change in shape of the dividing line becomes a straight line similar to the connection line. Therefore, the distance between the ply end and the hard stiffener can be maintained at a certain value or more against stiffener distortion due to running, which reduces ply end distortion and improves the durability of the bead part. .

なお、分割線の各突出位置は分割線の両端を結ぶ結線の
端からこの結線の長さの４０％〜６０％の位置にあるこ
とことが好ましい。Note that each protruding position of the dividing line is preferably located at a position 40% to 60% of the length of the connecting line from the end of the connecting line connecting both ends of the dividing line.

また、分割線の各突出部と結線との間に形成される硬ス
テイフナ−の凹部及び凸部の各断面積は硬ステイフナ−
の全断面積の５％〜１５％が好ましく、５％以下では、
期待する効果が得られず、１５％以上では逆にプライエ
ンド歪みが増加される。In addition, the cross-sectional area of each concave and convex portion of the hard stiffener formed between each protrusion of the parting line and the wire connection is
5% to 15% of the total cross-sectional area is preferable, and below 5%,
The expected effect cannot be obtained, and if it exceeds 15%, the ply end distortion will increase.

〔実施例〕〔Example〕

第１図に示される如く、本発明の第１実施例の重荷重用
ラジアルタイヤ１０　（タイヤサイズは１１Ｒ２２，５
）においては、カーカスプライ１２は少なくとも一枚の
金属コードよりなり、ビード部１０Ａには、一対のリン
グ状のビードワイヤ１４が配置されている。また、カー
カスプライ１２はビードワイヤ１４の周りにビードワイ
ヤ１４の内周をタイヤ幅方向内側（第１図の右側）から
外側（第１図の左側）へ向けて折返され、折返しプライ
１２Ａが形成されている。As shown in FIG. 1, a heavy load radial tire 10 (tire size is 11R22,5
), the carcass ply 12 is made of at least one metal cord, and a pair of ring-shaped bead wires 14 are arranged in the bead portion 10A. Further, the carcass ply 12 is folded around the bead wire 14 by folding the inner periphery of the bead wire 14 from the inside in the tire width direction (the right side in FIG. 1) to the outside (the left side in FIG. 1) to form a folded ply 12A. There is.

また、カーカスプライ１２のボデープライ１２Ｃと折返
しプライ１２Ａにより囲まれる断面形状が略三角形をし
た区域内には、ビード部１０Ａの高い剛性を保つともに
、サイドウオール部１０Ｂがうける繰返し応力を円滑に
ビード部１０Ａへ伝達するためのステイフナ−１６が充
填されている。In addition, in the area surrounded by the body ply 12C and the folded ply 12A of the carcass ply 12, which has a substantially triangular cross-sectional shape, the bead part 10A maintains high rigidity and smoothly absorbs repeated stress applied to the sidewall part 10B. A stiffener 16 for transmission to 10A is filled.

このステイフナ−１６はビード部１０Ａからサイドウオ
ール部１０Ｂに向けてその肉厚を漸減して、前記のごと
く断面形状は略三角形をなしており、サイドウオール部
１０Ｂに近い側は軟ステイフナ−１８とされ、ビード部
１０Ａに近い側は硬ステイフナ−２０とされている。The stiffener 16 gradually decreases in thickness from the bead portion 10A toward the sidewall portion 10B, and has a substantially triangular cross-sectional shape as described above, and the side closer to the sidewall portion 10B is a soft stiffener 18. The side closer to the bead portion 10A is a hard stiffener 20.

これらの軟ステイフナ−１８と硬ステイフナ−２０との
タイヤ子午線断面（第１図）における分割線２２は、ビ
ード部１０Ａに近い側の端２２Ａがビードワイヤ１４の
タイヤ幅方向外側近傍の折返しプライ１２Ａへ至ってお
り、他方の端２２Ｂは、プライエンド１２Ｂに対向する
ボディプライ１２Ｃへ至っている。The dividing line 22 between the soft stiffener 18 and the hard stiffener 20 in the tire meridian cross section (FIG. 1) has an end 22A on the side closer to the bead portion 10A connected to the folded ply 12A near the outside of the bead wire 14 in the tire width direction. The other end 22B reaches the body ply 12C opposite the ply end 12B.

また、この分割線２２は、分割線２２の両端２２Ａと２
２Ｂとを結ぶ結線の長さＬの、端２２Ａから４０％〜６
０％の位置Ｍのトレッド側が硬ステイフナー２０側へ円
弧状に突出すると共に、ビードワイヤ１４側が軟ステイ
フナー側１８へ円弧状に突出しており、合わせて波状と
されている。Further, this dividing line 22 is connected to both ends 22A and 2 of the dividing line 22.
40% to 6 from the end 22A of the connection length L connecting with 2B
The tread side at the 0% position M protrudes in an arc shape toward the hard stiffener 20 side, and the bead wire 14 side protrudes in an arc shape toward the soft stiffener side 18, both of which are wavy.

また、分割線２２の各突出部と結線２４との間に形成さ
れる硬ステイフナ−２０の凹部及び凸部の各断面積Ｍ１
及びＭ２は夫々硬ステイフナ−２０の全断面積Ｍの５％
〜１５％とされている。In addition, each cross-sectional area M1 of the concave portion and convex portion of the hard stiffener 20 formed between each protrusion of the dividing line 22 and the wire connection 24
and M2 are each 5% of the total cross-sectional area M of the hard stiffener 20.
~15%.

なお、図中符号２８はタイヤの外部及び内部を構成する
ゴム等で構成された部分を示しており、符号２９はエア
ー充填部を示している。また符号３０はロードホイール
のホイールリムを示している。In addition, the reference numeral 28 in the figure indicates a portion made of rubber or the like that constitutes the outside and inside of the tire, and the reference numeral 29 indicates an air filling portion. Further, reference numeral 30 indicates a wheel rim of the road wheel.

従って、走行時に重荷重用ラジアルタイヤ１０へ車両等
の荷重が作用し、サイドウオール部１０Ｂがうける繰返
し応力によって、ボデープライ１２Ｃが矢印Ｇ方向へ引
っ張られる。このため、分割線２２のトレッド側が軟ス
テイフナー１８側へ移動し、この反力として分割線２２
のビードワイヤ１４側が硬ステイフナー２０側へ移動す
る。この場合に、分割線２２の形状は結線２４に近い直
線状となる。このため、走行によりステイフナ−１６が
歪んだ場合においても、プライエンド１２Ｂと硬ステイ
フナ−２０との間隔を一定値以上に保てるため、プライ
エンド歪みを低減でき、ビード部１０Ａの耐久性を向上
することができる。Therefore, when the vehicle is running, a load from a vehicle or the like acts on the heavy-duty radial tire 10, and the body ply 12C is pulled in the direction of arrow G due to the repeated stress that the sidewall portion 10B receives. Therefore, the tread side of the parting line 22 moves toward the soft stiffener 18, and as a reaction force, the parting line 22 moves toward the soft stiffener 18 side.
The bead wire 14 side moves toward the hard stiffener 20 side. In this case, the shape of the dividing line 22 becomes a straight line close to the connection line 24. Therefore, even if the stiffener 16 is distorted due to running, the distance between the ply end 12B and the hard stiffener 20 can be maintained at a certain value or more, reducing ply end distortion and improving the durability of the bead portion 10A. be able to.

く実験例） 第１図に示される第１実施例の重荷重用ラジアルタイヤ
１０　（硬ステイフナ−２０の凹部及び凸部の断面積Ｍ
１、Ｍ２は夫々硬ステイフナ−２０の全断面積Ｍの１０
％とされている）、第２実施例の重荷重用ラジアルタイ
ヤ（硬ステイフナ−２０の凹部及び凸部の断面積Ｍ１、
Ｍ２は夫々硬ステイフナ−２０の全断面積Ｍの２０％と
されている）、第２図に示される比較例の重荷重用ラジ
アルタイヤ４０　（分割線４２の凹凸方向が第１実施例
の重荷重用ラジアルタイヤ１０の分割線２２の凹凸方向
の逆とされている）及び第４図に示される従来例の重荷
重用ラジアルタイヤ５０に、夫々正規内圧充填後正規荷
重負荷を加えた場合のカーカスプライエンド１２Ｂに沿
ったタイヤ半径方向（第１図の矢印Ｈ方向）の歪みを測
定し、その結果を従来例の重荷重用ラジアルタイヤ５０
の歪みを１００とした、着重時プライエンド歪み指数と
して、第３図に示した。Experimental Example) The heavy-load radial tire 10 of the first embodiment shown in FIG.
1, M2 is 10 of the total cross-sectional area M of the hard stiffener 20, respectively.
%), the heavy-duty radial tire of the second embodiment (the cross-sectional area M1 of the concave portions and convex portions of the hard stiffener 20,
M2 is 20% of the total cross-sectional area M of the hard stiffener 20), and the heavy-load radial tire 40 of the comparative example shown in FIG. The carcass ply end when a regular load is applied to the conventional heavy-duty radial tire 50 shown in FIG. 4 after filling with the regular internal pressure. 12B in the tire radial direction (in the direction of arrow H in Figure 1), and the results were compared to the conventional heavy-duty radial tire 50.
Figure 3 shows the ply end strain index when loaded, with the strain being 100.

なお、第２実施例、比較例及び従来例の各重荷重用ラジ
アルタイヤのタイヤサイズ及び、説明を省略した構造等
は第１実施例のタイヤと同一とした。Note that the tire size, structure, etc. of the heavy-duty radial tires of the second example, comparative example, and conventional example were the same as those of the first example.

この実験結果によって上記説明した本発明の重荷重用ラ
ジアルタイヤが従来例及び比較例のタイヤに比べ、着重
時プライエンド歪み指数が小さく、ビード部の耐久性が
向上することが明らかになっている。The results of this experiment revealed that the heavy-duty radial tire of the present invention described above has a smaller ply end distortion index when loaded and has improved bead section durability than the conventional and comparative tires.

〔発明の効果〕〔Effect of the invention〕

本発明は上記の構成としたので、ビード部の耐久性を向
上することができるという優れた効果を有する。Since the present invention has the above configuration, it has an excellent effect of improving the durability of the bead portion.

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

第１図は本発明が適用された第１実施例の重荷重用ラジ
アルタイヤのビード部を示す一部ノ入ツチングを省略し
たタイヤ子午線断面の片側断面図、第２図は本発明の比
較例の重荷重用ラジアルタイヤのビード部を示す一部ハ
ツチングを省略したタイヤ子午線断面の片側断面図、第
３図は凸部の断面積とプライエンド歪みとの関係を示す
グラフ、第４図は従来の重荷重用ラジアルタイヤのビー
ド部を示す一部ハッチングを省略したタイヤ子午線断面
の片側断面図である。 １０・・・重荷重用ラジアルタイヤ、 １０Ａ・ １０Ｂ・ １２　・　・ １４　・　・ １６　・　・ １８　・　・ ２０　・　・ ２２　・　・ ２４　・　・ ・ビード部、 ・サイドウオール部、 カーカスプライ、 ビードワイヤ、 ステイフナ− 軟ステイフナ− 硬ステイフナ− 分割線、 結線。FIG. 1 is a half sectional view of a tire meridian cross section showing the bead portion of a heavy-duty radial tire according to a first embodiment of the present invention, with some cutouts omitted, and FIG. A half-sectional view of a tire meridian cross section showing the bead part of a heavy-duty radial tire with some hatching omitted. Figure 3 is a graph showing the relationship between the cross-sectional area of the convex part and ply end distortion. Figure 4 is a conventional heavy-duty radial tire. It is a half sectional view of a tire meridian cross section showing a bead part of a heavy-duty radial tire with some hatching omitted. 10...Heavy load radial tire, 10A, 10B, 12, 14, 16, 18, 20, 22, 24, bead section, sidewall section, carcass ply, bead wire, stiffener Soft stiffener Hard stiffener Parting line, connection.

Claims (3)

【特許請求の範囲】[Claims] （１）金属コードよりなる少なくとも一枚のカーカスプ
ライと、一対のビードワイヤと、トレツド側が軟ステイ
フナーとされビードワイヤ側が硬ステイフナーとされる
と共にタイヤ子午線断面において前記軟ステイフナーと
前記硬ステイフナーとの分割線のトレツド側端がプライ
エンド近傍のボデープライに至るステイフナーと、を有
する重荷重用ラジアルタイヤであって、前記分割線のト
レツド側が前記硬ステイフナー側へ突出すると共に前記
分割線のビードワイヤ側が前記軟ステイフナー側へ突出
したことを特徴とする重荷重用ラジアルタイヤ。(1) At least one carcass ply made of a metal cord, a pair of bead wires, a soft stiffener on the tread side and a hard stiffener on the bead wire side, and a parting line between the soft stiffener and the hard stiffener in the tire meridian cross section. A radial tire for heavy loads, comprising a stiffener whose tread side end reaches a body ply near the ply end, wherein the tread side of the parting line projects toward the hard stiffener side, and the bead wire side of the parting line projects toward the soft stiffener side. A radial tire for heavy loads that is characterized by: （２）前記分割線の各突出位置が前記分割線の両端を結
ぶ結線の端からこの結線の長さの４０％〜６０％の位置
にあることを特徴とする請求項（１）記載の重荷重用ラ
ジアルタイヤ。(2) The load according to claim (1), wherein each protruding position of the dividing line is located at a position of 40% to 60% of the length of the connecting line connecting both ends of the dividing line from the end of the connecting line. Heavy duty radial tire. （３）前記分割線の各突出部と前記結線との間に形成さ
れる前記硬ステイフナーの凹部及び凸部の各断面積が前
記硬ステイフナーの全断面積の５％〜１５％であること
を特徴とする請求項（１）記載の重荷重用ラジアルタイ
ヤ。(3) The cross-sectional area of each concave portion and convex portion of the hard stiffener formed between each protrusion of the dividing line and the wire connection is 5% to 15% of the total cross-sectional area of the hard stiffener. A radial tire for heavy loads according to claim (1).
JP5296890A 1990-03-05 1990-03-05 Radial tires for heavy loads Expired - Lifetime JP2945432B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5296890A JP2945432B2 (en) 1990-03-05 1990-03-05 Radial tires for heavy loads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5296890A JP2945432B2 (en) 1990-03-05 1990-03-05 Radial tires for heavy loads

Publications (2)

Publication Number Publication Date
JPH03253412A true JPH03253412A (en) 1991-11-12
JP2945432B2 JP2945432B2 (en) 1999-09-06

Family

ID=12929693

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5296890A Expired - Lifetime JP2945432B2 (en) 1990-03-05 1990-03-05 Radial tires for heavy loads

Country Status (1)

Country Link
JP (1) JP2945432B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000158919A (en) * 1998-11-24 2000-06-13 Bridgestone Corp Pneumatic tire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000158919A (en) * 1998-11-24 2000-06-13 Bridgestone Corp Pneumatic tire
JP4512210B2 (en) * 1998-11-24 2010-07-28 株式会社ブリヂストン Pneumatic tire

Also Published As

Publication number Publication date
JP2945432B2 (en) 1999-09-06

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