JPS63103706A - Pneumatic radial tire for high speed heavy load - Google Patents
Pneumatic radial tire for high speed heavy loadInfo
- Publication number
- JPS63103706A JPS63103706A JP61249410A JP24941086A JPS63103706A JP S63103706 A JPS63103706 A JP S63103706A JP 61249410 A JP61249410 A JP 61249410A JP 24941086 A JP24941086 A JP 24941086A JP S63103706 A JPS63103706 A JP S63103706A
- Authority
- JP
- Japan
- Prior art keywords
- belt
- layer
- carcass
- layers
- durability
- 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
- 239000000835 fiber Substances 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims 6
- 208000004221 Multiple Trauma Diseases 0.000 claims 1
- 208000027418 Wounds and injury Diseases 0.000 claims 1
- 239000011229 interlayer Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 229920006231 aramid fiber Polymers 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229920000271 Kevlar® Polymers 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Tires In General (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
航空機用ラジアルタイヤを典型例として、一般的には、
これと類似な、高速・重荷重下の稼動条件下に使用され
る、空気入りラジアルタイヤについての、耐久性向上に
関連した開発研究の成果を以下に述べる。[Detailed Description of the Invention] (Industrial Application Field) In general, aircraft radial tires are a typical example.
The following describes the results of development research related to improving the durability of pneumatic radial tires, which are used under similar operating conditions at high speeds and under heavy loads.
航空機タイヤは、大量輸送の要請の下にますます高速・
重荷重の条件がか酪化、し、その一方で軽量化の要求も
強い上に、安全面から耐久性の一層の改善向上がのぞま
れる。Aircraft tires are becoming increasingly faster and faster due to demands for mass transportation.
The conditions for heavy loads are becoming stiffer, and at the same time there is a strong demand for weight reduction, and further improvements in durability are desired from a safety standpoint.
タイヤの軽量化の観点においてカーカス補強構造のラジ
アル化は有用であるが、試作実験の結果は、高荷重の負
荷それもと(に航空機のタキシング走行の際に接地端近
傍におけるトレッド層にて面内せん断ひずみが集中し、
しばしばベルトとトレッド界面にセパレーションが発生
し、ベルトの耐久性が害され勝ちなことが、明らかとな
った。Radialization of the carcass reinforcement structure is useful from the perspective of reducing the weight of the tire, but the results of prototype experiments have shown that the tread layer near the ground contact point is affected by high loads (during aircraft taxiing). Internal shear strain concentrates,
It has become clear that separation often occurs at the belt and tread interface, which tends to impair the durability of the belt.
ベルトとトレド界面での面内せん断ひずみを低減するた
めには、ベルトのコードインシュレーシッン径を増大さ
せる対策は有効であるがその反面補強効果の減殺に加え
て、ベルト、ひいてはタイヤ重量の不所望な増大を余儀
なくし、ここにベルト耐久性の改善とダイヤの軽量化と
は、互いに相克条件となる。In order to reduce the in-plane shear strain at the belt and Toledo interface, increasing the cord insulation diameter of the belt is effective. This results in an undesirable increase, and thus improving belt durability and reducing the weight of the diamond become mutually exclusive conditions.
(従来の技術)
航空機用空気入りラジアルタイヤに関してその耐久性、
軽量化の両立を企図することについては、現時点で既知
文献による報告は見当らない。(Prior art) Regarding the durability of pneumatic radial tires for aircraft,
At present, there are no reports in known literature regarding attempts to achieve both weight reduction.
(発明が解決しようとする問題点)
高速・重荷重用空気入りラジアルタイヤのタキシフグ時
の如き高荷重下の走行に際して、ベルトとトレッドの界
面における面内せん断歪の段差に由来したセパレーショ
ン発生の機会を、ベルトの重量増加を伴わずに封じるこ
とによる、タイヤの耐久性と軽量の両立を有利に達成す
ることがこの発明の目的である。(Problem to be solved by the invention) When a pneumatic radial tire for high-speed, heavy-duty use runs under high loads such as during a taxi, it is possible to reduce the chance of separation occurring due to the difference in in-plane shear strain at the interface between the belt and the tread. An object of the present invention is to advantageously achieve both durability and light weight of a tire by sealing the belt without increasing its weight.
(問題点を解決するための手段)
この発明は互いに平行配列をなす有機繊維コードのプラ
イよりなるトロイド状ラジアル構造のカーカスと、この
カーカスのクラウン領域のまわりをこれと同心の密着巻
きらせんコイル状に取巻く有機繊維コードの多重巻回層
からなるベルトとを備え、このベルトの多重巻回層が、
カーカスから離隔した最外側層を第n層として第(n−
1)N及び/又はさらにこれと第n−2層との間の層間
で、ベルトの両幅端の近傍の領域に挟在配置した薄いゴ
ムスキージを有するものとして成ることを特徴とする、
高速重荷重用空気入りラジアルタイヤである。(Means for Solving the Problems) This invention provides a carcass with a toroidal radial structure consisting of plies of organic fiber cords arranged in parallel to each other, and a tightly wound helical coil concentrically around the crown region of the carcass. and a belt consisting of multiple winding layers of organic fiber cord surrounding the belt, and the multiple winding layers of this belt are
The outermost layer separated from the carcass is the n-th layer.
1) It is characterized by having a thin rubber squeegee sandwiched between the N and/or further between this and the n-2th layer in a region near both width ends of the belt.
This is a pneumatic radial tire for high speed and heavy loads.
さて第1図にこの発明に従う航空機用空気入りラジアル
タイヤの要部をタイヤ回転軸を含む断面で示し図中1は
カーカス、2はベルト、3はトレッド層をあられす。Now, FIG. 1 shows the main parts of a pneumatic radial tire for aircraft according to the present invention in a cross section including the tire rotation axis, and in the figure, 1 is a carcass, 2 is a belt, and 3 is a tread layer.
カーカス1は、互いに平行配列をなす有機繊維、たとえ
ばアラミド繊維コードの図示例では2枚のプライよりな
る、トロイド状ラジアル構造とし、このカーカス1のク
ラウン領域のまわりをこれと同心の密着巻きらせんコイ
゛ル状に取巻く有機繊維、たとえぼやはりアラミド繊維
コードの多重、図示例では6重の巻回層からなるベルト
2によって、堅固なたが状補強に供する。ベルト2はと
きには図示したようにベルト2の幅方向中央域にてベル
ト2の半幅Wの0.6〜0.7倍に当る狭い追加巻回層
2′を含むものとしてもよい。The carcass 1 has a toroidal radial structure consisting of two plies of organic fibers, e.g. aramid fiber cords, arranged parallel to each other, in the illustrated example, and a closely wound helical coil concentrically around the crown region of the carcass 1. Sturdy hoop-like reinforcement is provided by the belt 2 consisting of multiple layers of organic fibers, for example aramid fiber cords, which are wrapped in a coil, six layers in the illustrated example. The belt 2 may sometimes include a narrow additional winding layer 2' having a width of 0.6 to 0.7 times the half-width W of the belt 2 in the widthwise central region of the belt 2, as shown.
ベルト2の巻回層は追加巻回[2’を用いるときこれも
同様であるが、1本か又はせいぜい2゜3本程度のコー
ドにゴムコーティングを施して、密着巻きらせんコイル
状としてカーカスlのクラウン領域のまわりへ同心多重
に巻付けることにより、そのコード方向は、タイヤ円周
に対して極く浅い角度をなし、しばしば周方向配列と呼
ばれる。The winding layer of the belt 2 is an additional winding [this is also the same when using 2', but one cord or at most 2.3 cords is coated with rubber, and the carcass is wrapped tightly in the form of a spiral coil. By concentrically wrapping around the crown region of the tire, the cord direction is at a very shallow angle to the tire circumference, often referred to as circumferential alignment.
さてベルト2の多重の巻回層は、一般に追加を回層を除
外して、カーカス1から離隔した最外側層を第n層とし
、順に第(n−1)層、第(n −2)層と呼ぶことに
して第1図では第n、 (n −1)71間に、とき
にはさらに第(n−1)、(n−2)層間にも、ベルト
2の両幅端縁の近傍、とくに好ましくは幅端から、ベル
ト2の半幅Wの0.3倍以内にわたるゴムスキージ4を
挟在配置して成るものとする。Now, the multiple winding layers of the belt 2 are generally excluded from additional winding layers, with the outermost layer separated from the carcass 1 being the n-th layer, the (n-1)th layer, the (n-2)th layer, and so on. In FIG. 1, the layer is referred to as a layer, and in FIG. Particularly preferably, a rubber squeegee 4 is disposed between the width ends and extends within 0.3 times the half width W of the belt 2.
このゴムスキージ4は、上記半幅Wのほぼ0.04倍以
上であることがのぞましい。This rubber squeegee 4 preferably has a width approximately 0.04 times or more the above-mentioned half width W.
ここにベルト2の半幅Wは、一般にトレッド層3の接地
幅の0.4〜0.6倍(ベルト2の幅2Wでは、0.8
〜1.2倍)の範囲とすることが、航空機用タイヤの如
き高速下の使用条件に適合させるために必要であるのは
、すでに判っている。Here, the half width W of the belt 2 is generally 0.4 to 0.6 times the ground contact width of the tread layer 3 (for the width 2W of the belt 2, it is 0.8
It has already been found that a range of 1.2 to 1.2 times is necessary in order to adapt to high-speed usage conditions such as aircraft tires.
ゴムスキージ4は、ベルト2ψ巻回層に用いる有機繊維
コードの被覆ゴムを除外した外径dを基準として、0.
25〜1.0倍の範囲の厚さとすることがのぞましい。The rubber squeegee 4 has an outer diameter d of 0.00 mm, with the outer diameter d excluding the rubber coating of the organic fiber cord used for the winding layer of the belt 2ψ, as a reference.
It is desirable that the thickness be in the range of 25 to 1.0 times.
(作 用)
さて第1図に示したサイズH46−18R20の供試タ
イヤを、これに対しゴムスキージ4の配置をしない点で
のみ異なる第2図の比較タイヤで接地端近傍におけるト
レッド層3に生じ勝ちなセパレーション5の発生要因で
ある、主せん断歪の分布に関して第3図で比較タイヤと
対比し有限要素法による計算結果を示した。(Function) Now, the test tire of size H46-18R20 shown in FIG. Regarding the distribution of principal shear strain, which is a factor in the occurrence of separation 5, Figure 3 shows the calculation results using the finite element method in comparison with a comparison tire.
この試験ではゴムスキージ4は厚み0.5 tm(0,
426)幅55mm (0,31w)のサイズでJIS
硬さくJISに6361 JIS硬度A型)43〜4
8.100%伸長時モジュラス 25.Okgf/aa
zの物性として第n1(n−1)層間にのみ挟在配置し
たときの成績を第3図の実線に示したように、ゴムスキ
ージ4を用いなかった比較タイヤにつき同図の破線のご
ときベルト2の最外層とトレッド層3の境界における主
せん断歪の段差が、著しく緩和される。In this test, the rubber squeegee 4 had a thickness of 0.5 tm (0,
426) Width 55mm (0,31w) size JIS
Hardness JIS 6361 JIS hardness type A) 43-4
8. Modulus at 100% elongation 25. Okgf/aa
As shown in the solid line in Fig. 3, the results when the belt 2 is sandwiched only between the n1 (n-1) layer as the physical properties of z are shown in the solid line in Fig. 3. The difference in principal shear strain at the boundary between the outermost layer and the tread layer 3 is significantly reduced.
なおベルト2の巻回層の全層間にゴムスキージを適用し
た参考例にあっては、同図の鎖線のように主せん断歪の
分布に関する限りはのぞましいがその反面でベルト2の
トータルゲージの増大による、温度上昇の不利があり、
従ってゴムスキージの挟在配置は、第n、(n−1)層
間のみか、せいぜいさらに第(n−1)、(n−2)層
間に施すのが限度であることがわかった。In addition, in the reference example in which a rubber squeegee is applied between all the winding layers of belt 2, the distribution of principal shear strain is desirable as shown by the chain line in the same figure, but on the other hand, the increase in the total gauge of belt 2 , there is a disadvantage of temperature rise,
Therefore, it has been found that the rubber squeegee can only be placed between the nth and (n-1) layers, or at most between the (n-1) and (n-2) layers.
またこの温度上昇をもたらす発熱は、ゴムスキージ4の
厚みtに対して、主せん断歪の段差の低減とともに関連
し、この関係を第4図にて、発熱(χ)とをそれぞれ縦
軸にまたゴムスキージ厚みtのコード径dに対する倍率
を横軸にとって示したように、0.25d〜1.Odの
厚さの範囲では、主せん断歪の段差を、発熱の有効な抑
制の下に低減することができる。Furthermore, the heat generation that causes this temperature rise is related to the thickness t of the rubber squeegee 4, as well as the reduction in the step of the principal shear strain. As shown on the horizontal axis, the magnification of the thickness t with respect to the cord diameter d is 0.25d to 1. In the thickness range of Od, the difference in principal shear strain can be reduced while effectively suppressing heat generation.
(実施例)
ベルト2に、コード径1.2鶴φ及び1.51φのケブ
ラコードよりなる6重巻回層を用いて種々に厚みが異な
る幅6011のゴムスキージによる、耐久性増強効果を
比較した試験の結果は、表1の通りである。(Example) A test comparing the durability enhancement effect of rubber squeegees with widths of 6011 and various thicknesses using a six-wound layer of Kevlar cord with cord diameters of 1.2 and 1.51 φ for the belt 2. The results are shown in Table 1.
この試験は、TSO−C62に定める120%TAXI
条件に従うドラム耐久テストで、接地環近傍のトレンド
層にセパレーションが発生するに至るドラム回転数と、
この試験終了直後に、予め耐久性には全く影響しない極
小径でトレッド層3にベルト2の直上0.5 thの深
さまであけておいた測定穴にセンサを挿入して測温した
最高温度によって評価した。This test is 120% TAXI specified in TSO-C62.
In a drum durability test according to the conditions, the drum rotation speed at which separation occurred in the trend layer near the ground contact ring,
Immediately after completing this test, a sensor was inserted into a measurement hole that had been previously drilled in the tread layer 3 to a depth of 0.5 th directly above the belt 2 with an extremely small diameter that did not affect durability at all, and the highest temperature was measured. evaluated.
(発明の効果)
この発明により、航空機用ゴム車輪のように高速重荷重
のか酷な走行条件で供用される空気入りタイヤの軽量化
が、耐久性の劣化を伴うことなく実現される。(Effects of the Invention) According to the present invention, it is possible to reduce the weight of pneumatic tires, such as rubber wheels for aircraft, which are used under harsh running conditions under high speed and heavy loads, without deteriorating their durability.
第1図はこの発明に従う空気入りラジアルタイヤの断面
図、
第2図は比較例についての断面図、
第3図は主せん断歪分布図であり、
第4図はゴムスキージの厚みが主せん断歪の段差と発熱
に及ぼす影響を示すグラフである。
1・・・カーカス 2・・・ベルト3・・・ト
レッド層 4・・・ゴムスキージ第3図
第4図
(%) (kfF/mrn)でムスA−グ厚
でFig. 1 is a cross-sectional view of a pneumatic radial tire according to the present invention, Fig. 2 is a cross-sectional view of a comparative example, Fig. 3 is a principal shear strain distribution diagram, and Fig. 4 shows that the thickness of the rubber squeegee affects the principal shear strain. It is a graph showing the effect of height difference and heat generation. 1...Carcass 2...Belt 3...Tread layer 4...Rubber squeegee Figure 3 Figure 4 (%) (kfF/mrn) Mus A-g thickness
Claims (1)
なるトロイド状ラジアル構造のカーカスと、このカーカ
スのクラウン領域のまわりをこれと同心の密着巻きらせ
んコイル状に取巻く有機繊維コードの多重巻回層からな
るベルトとを備え、このベルトの多重巻回層が、カーカ
スから離隔した最外側層を第n層として第(n−1)層
及び/又はさらにこれと第n−2層との間の層間で、ベ
ルトの両幅端の近傍の領域に挟在配置した薄いゴムスキ
ージを有するものとして成ることを特徴とする、高速重
荷重用空気入りラジアルタイヤ。1. A carcass with a toroidal radial structure consisting of plies of organic fiber cords arranged parallel to each other, and multiple wound layers of organic fiber cords wrapped around the crown region of the carcass in a tightly wound spiral coil concentrically with the crown region of the carcass. The belt has multiple winding layers, the outermost layer separated from the carcass is the nth layer, and/or the (n-1)th layer and/or the interlayer between this and the n-2nd layer. A pneumatic radial tire for high-speed heavy loads, characterized in that it has a thin rubber squeegee sandwiched in a region near both width ends of the belt.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61249410A JPS63103706A (en) | 1986-10-22 | 1986-10-22 | Pneumatic radial tire for high speed heavy load |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61249410A JPS63103706A (en) | 1986-10-22 | 1986-10-22 | Pneumatic radial tire for high speed heavy load |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63103706A true JPS63103706A (en) | 1988-05-09 |
Family
ID=17192558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61249410A Pending JPS63103706A (en) | 1986-10-22 | 1986-10-22 | Pneumatic radial tire for high speed heavy load |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63103706A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0253603A (en) * | 1988-08-18 | 1990-02-22 | Sumitomo Rubber Ind Ltd | Radial tire for high-speed and heavy load purpose |
JP2007161003A (en) * | 2005-12-12 | 2007-06-28 | Bridgestone Corp | Radial tire for aircraft |
WO2008041440A1 (en) * | 2006-09-29 | 2008-04-10 | Bridgestone Corporation | Radial tire for aircraft and its production method |
-
1986
- 1986-10-22 JP JP61249410A patent/JPS63103706A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0253603A (en) * | 1988-08-18 | 1990-02-22 | Sumitomo Rubber Ind Ltd | Radial tire for high-speed and heavy load purpose |
JP2007161003A (en) * | 2005-12-12 | 2007-06-28 | Bridgestone Corp | Radial tire for aircraft |
WO2008041440A1 (en) * | 2006-09-29 | 2008-04-10 | Bridgestone Corporation | Radial tire for aircraft and its production method |
JP2008087557A (en) * | 2006-09-29 | 2008-04-17 | Bridgestone Corp | Radial tire for aircraft, and its manufacturing method |
US8371352B2 (en) | 2006-09-29 | 2013-02-12 | Bridgestone Corporation | Radial tire for use in aircraft and method of producing the same |
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