JP2010111084A - Method for manufacturing radial tire for aircraft, and radial tire for aircraft - Google Patents

Method for manufacturing radial tire for aircraft, and radial tire for aircraft Download PDF

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JP2010111084A
JP2010111084A JP2008287596A JP2008287596A JP2010111084A JP 2010111084 A JP2010111084 A JP 2010111084A JP 2008287596 A JP2008287596 A JP 2008287596A JP 2008287596 A JP2008287596 A JP 2008287596A JP 2010111084 A JP2010111084 A JP 2010111084A
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belt
tire
aircraft
tread
protective layer
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JP5350751B2 (en
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Kenji Matsumoto
憲二 松本
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a radial tire for an aircraft capable of reducing frequency of replacement of a protective layer which can be performed in retreating a tread as compared with a conventional one while sufficiently maintaining cut-resistant performance, and to provide a radial tire for an aircraft. <P>SOLUTION: In the method for manufacturing the radial tire for the aircraft which includes a pair of bead cores 2, a radial carcass 6 comprising at least one carcass ply extending toroidally between the bead cores 2, a belt 7 comprising at least one belt layer arranged between the periphery of a crown part of the radial carcass 6 and a tread 5 of a tire 1, and a protective layer 11 which is arranged between the belt 7 and the tread 5 and covers the belt 7, a dip cord 25 is spirally and continuously wound circumferentially along the tire in the state of being curved in a wavy shape on the periphery of the belt 7 after forming the belt 7 in order to form the protective layer 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、航空機用ラジアルタイヤの製造方法及び航空機用ラジアルタイヤに関し、より詳細には、トレッド補強部材である保護層の改良にある。   The present invention relates to an aircraft radial tire manufacturing method and an aircraft radial tire, and more particularly to an improvement of a protective layer which is a tread reinforcing member.

航空機用のタイヤは、高内圧、高荷重、高速回転といった過酷な条件下で使用されるとともに唯一路面に接する部品でもあるため常に高い耐久性が要求される。特に、路面上の異物等の外的要因に対する耐カット性の確保は重要であり、耐カット性を高めるためには、特許文献１に記載されているように、ベルトとトレッドとの間に、タイヤ周方向に沿って延びる波形コードよりなる保護層を配設するのが有用である。
特開平５−２９４１０７号公報 Aircraft tires are used under harsh conditions such as high internal pressure, high load, and high speed rotation, and are also the only parts that contact the road surface, so high durability is always required. In particular, it is important to ensure cut resistance against external factors such as foreign matters on the road surface. To improve cut resistance, as described in Patent Document 1, between the belt and the tread, It is useful to dispose a protective layer made of a corrugated cord extending along the tire circumferential direction.
JP-A-5-294107

この発明の目的は、耐カット性能を十分確保しつつも、従来に比べて、トレッドの更生に際して行われ得る保護層の貼り替えの頻度を減らすことの可能な航空機用ラジアルタイヤの製造方法及び航空機用ラジアルタイヤを提供することにある。   An object of the present invention is to provide a radial tire manufacturing method and an aircraft capable of reducing the frequency of replacement of a protective layer that can be performed at the time of tread rehabilitation as compared with the conventional technology while ensuring sufficient cut resistance. It is to provide a radial tire for use.

前記の目的を達成するため、この発明の航空機用ラジアルタイヤの製造方法は、一対のビードコアと、該ビードコア間にトロイド状に延在する少なくとも１枚のカーカスプライよりなるラジアルカーカスと、該ラジアルカーカスのクラウン部外周とタイヤのトレッドとの間に配置された少なくとも１枚のベルト層よりなるベルトと、該ベルトと前記トレッドとの間に配置されて該ベルトを覆う保護層とを備えた航空機用ラジアルタイヤの製造方法において、前記保護層を成形するにあたり、前記ベルトの成形後に、該ベルトの外周へディップコードを波形に迂曲した状態でタイヤ周方向に螺旋状に連続して巻き付けることを特徴とするものである。なお、ここでいう「ディップコード」とは生コードにディッピング処理が施されたコード単体を指すものであり、ゴムシート等でコーティングされたいわゆるコーテッドコードやトリート等は含まない。   In order to achieve the above object, a method for manufacturing a radial tire for aircraft according to the present invention includes a pair of bead cores, a radial carcass formed of at least one carcass ply extending in a toroid shape between the bead cores, and the radial carcass. An aircraft comprising: a belt comprising at least one belt layer disposed between the outer periphery of the crown portion of the tire and a tread of the tire; and a protective layer disposed between the belt and the tread and covering the belt In the method for manufacturing a radial tire, when forming the protective layer, after forming the belt, the dip cord is wound around the outer periphery of the belt continuously in a spiral shape in a state of being bent in a waveform. To do. Here, the “dip code” refers to a single code obtained by dipping the raw code, and does not include a so-called coated code or treat coated with a rubber sheet or the like.

かかる航空機用ラジアルタイヤの製造方法によれば、ディップコードをタイヤ周方向に連続して巻き付けて保護層を形成することにより、保護層にジョイント部が形成されないので、保護層の耐久性及び保護層―トレッド間の耐ピールオフ性を向上させることができる。従って、耐カット性能を十分確保しつつも、従来に比べて、トレッドゴムの更生に際して行われ得る保護層の貼り替えの頻度を減らすことが可能となる。   According to such a method for manufacturing a radial tire for an aircraft, since a protective layer is formed by continuously winding a dip cord in the tire circumferential direction, a joint portion is not formed in the protective layer. -The peel-off resistance between treads can be improved. Therefore, it is possible to reduce the frequency of the protective layer replacement that can be performed during the regeneration of the tread rubber, as compared with the conventional case, while ensuring sufficient cut resistance.

なお、この発明の航空機用ラジアルタイヤの製造方法にあっては、ディップコードを、ベルトの外周への巻き付けと同時に波形に成形することが好ましい。   In the method for manufacturing a radial tire for aircraft according to the present invention, it is preferable that the dip cord is formed into a corrugated shape simultaneously with the winding around the outer periphery of the belt.

しかも、この発明の航空機用ラジアルタイヤの製造方法にあっては、ディップコードを１〜４本ごとにベルトの外周に巻き付けることが好ましい。   Moreover, in the aircraft radial tire manufacturing method of the present invention, it is preferable to wrap one to four dip cords around the outer periphery of the belt.

また、この発明の航空機用ラジアルタイヤは、一対のビードコアと、該ビードコア間にトロイド状に延在する少なくとも１枚のカーカスプライよりなるラジアルカーカスと、このラジアルカーカスのクラウン部外周とタイヤのトレッドとの間に配置された少なくとも１枚のベルト層よりなるベルトと、該ベルトと前記トレッドとの間に配置されて該ベルトを覆う保護層とを備えた航空機用ラジアルタイヤにおいて、前記保護層は、波形に迂曲しつつ、前記ベルトの外周に螺旋状に連続して巻き付けられた少なくとも１本のディップコードで構成されることを特徴とするものである。   A radial tire for an aircraft according to the present invention includes a pair of bead cores, a radial carcass formed of at least one carcass ply extending in a toroid shape between the bead cores, an outer periphery of a crown portion of the radial carcass, and a tire tread. A radial tire for an aircraft, comprising: a belt composed of at least one belt layer disposed between the belt and the protective layer disposed between the belt and the tread; and covering the belt. It is characterized by comprising at least one dip cord wound continuously around the outer periphery of the belt in a spiral manner while making a curved shape.

この発明によれば、耐カット性能を十分確保しつつも、保護層の耐久性及び保護層―トレッド間の耐ピールオフ性を高めて、トレッドの更生に際して行われ得る保護層の貼り替えの頻度を減らすことが可能となる。   According to the present invention, while ensuring sufficient cut resistance, the durability of the protective layer and the peel-off resistance between the protective layer and the tread are enhanced, and the frequency of the protective layer replacement that can be performed during the regeneration of the tread is increased. It becomes possible to reduce.

以下、この発明の実施の形態を図面に基づいて説明する。図１は、この発明に従う代表的な航空機用ラジアルタイヤ（以下、「タイヤ」とする）のタイヤ幅方向断面図であり、図２は、タイヤのクラウン部に位置するベルトからトレッド部までの各部材の積層状態を示した概略図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view in the tire width direction of a typical aircraft radial tire (hereinafter referred to as “tire”) according to the present invention, and FIG. 2 shows each of the belt to tread portion located at the crown portion of the tire. It is the schematic which showed the lamination | stacking state of the member.

図１に示すタイヤ１は、ビードコア２を埋設した左右一対のビード部３、３と、両ビード部３、３からタイヤ径方向外側に延びる一対のサイドウォール部４、４と、両サイドウォール部４、４に跨って延在するトレッド部５を具える。タイヤ１内には、ビード部３、サイドウォール部４及びトレッド部５にわたってトロイド状に延びる少なくとも１枚のカーカスプライからなるカーカス６と、このカーカス６のクラウン域とトレッド部の間に配置された複数層のベルト層７ａ〜７ｄからなるベルト７とが埋設されている。   A tire 1 shown in FIG. 1 includes a pair of left and right bead portions 3, 3 in which a bead core 2 is embedded, a pair of sidewall portions 4, 4 extending from both bead portions 3, 3 outward in the tire radial direction, and both sidewall portions. 4 and 4 having a tread portion 5 extending over. In the tire 1, a carcass 6 composed of at least one carcass ply extending in a toroid shape over the bead part 3, the sidewall part 4, and the tread part 5, and the carcass 6 is disposed between the crown region and the tread part. A belt 7 composed of a plurality of belt layers 7a to 7d is embedded.

また、図２に示すように、このタイヤは、ベルト７の外周に１本の波形に迂曲したディップコード（以下、「波形コード」という）９が螺旋状に巻き付けられて形成された保護層１１を有する。保護層１１を構成する波形コード９は、耐カット性に優れたものであれば特に材質に制限はなく、例えば、有機繊維や金属繊維を用いることができる。波形コード９は、タイヤ周方向に途切れたりジョイント部が形成されたりすることなく連続して延びており、タイヤ幅方向に隣り合う波形コード９間の距離Ｌは相互にほぼ同じに設定されている。   In addition, as shown in FIG. 2, this tire has a protective layer 11 formed by spirally winding a dip cord (hereinafter referred to as a “corrugated cord”) 9 having a curved shape on the outer periphery of the belt 7. Have The corrugated cord 9 constituting the protective layer 11 is not particularly limited as long as it has excellent cut resistance, and for example, organic fiber or metal fiber can be used. The waveform cord 9 extends continuously without being interrupted in the tire circumferential direction or forming a joint portion, and the distance L between the waveform cords 9 adjacent to each other in the tire width direction is set to be approximately the same. .

なお、トレッド部５には、一般的なタイヤと同様、タイヤ周方向に沿って延びる複数本の周方向溝１２の他、図示は省略したが、該周方向溝を横断する方向に延びる複数本の横断溝等のトレッド溝や、複数本のサイプなどが用途に応じて適宜配設されている。   In addition to the plurality of circumferential grooves 12 extending along the tire circumferential direction, the tread portion 5 has a plurality of circumferential grooves 12 that extend in the direction crossing the circumferential groove, although not shown. A tread groove such as a transverse groove, a plurality of sipes, and the like are appropriately disposed depending on the application.

次に、上記タイヤの製造方法につき説明する。   Next, a method for manufacturing the tire will be described.

上記タイヤ１は、図３に示すように、製品タイヤの内面形状と実質上等しい内面形状に成形されたグリーンケースのクラウン域の外周上に、複数のベルト層７ａ〜７ｄからなるベルト７、下側ゴムシート１３、波形コード９、上側ゴムシート１４及びトップトレッド１６を順次重ね合わせてグリーンタイヤを形成し、次いでこのように形成されたグリーンタイヤを加硫金型内にセットした後、所定の条件下で加硫成形することによって製造される。   As shown in FIG. 3, the tire 1 includes a belt 7 including a plurality of belt layers 7 a to 7 d on the outer periphery of a crown region of a green case formed into an inner surface shape that is substantially equal to the inner surface shape of a product tire. The side rubber sheet 13, the corrugated cord 9, the upper rubber sheet 14, and the top tread 16 are sequentially stacked to form a green tire, and then the green tire thus formed is set in a vulcanization mold, Manufactured by vulcanization molding under conditions.

より詳細には、図２に示すように、保護層１１を成形するにあたって、ベルト７の成形後に、幅が波形コード９の配設範囲よりも大きく、所定の厚みを有する下側ゴムシート１３を、ベルト７の外周上に貼り付け、次いで、下側ゴムシート１３の外周上に波形に迂曲した波形コード９をタイヤ周方向に螺旋状に連続して巻き付け、さらにその上に、幅が波形コード９の配設範囲よりも大きく、所定の厚みを有する上側ゴムシート１４を貼り付ける。そして、上側ゴムシート１４の外周上にトップトレッド１６を貼り付けることによってグリーンタイヤの成形が終了する。   More specifically, as shown in FIG. 2, when the protective layer 11 is formed, after the belt 7 is formed, the lower rubber sheet 13 having a predetermined width and a width larger than the arrangement range of the corrugated cord 9 is formed. Then, a corrugated cord 9 that is affixed on the outer periphery of the belt 7 and is then continuously wound spirally in the tire circumferential direction on the outer periphery of the lower rubber sheet 13, and further, the width is a corrugated cord The upper rubber sheet 14 that is larger than the arrangement range 9 and has a predetermined thickness is attached. Then, the formation of the green tire is completed by attaching the top tread 16 on the outer periphery of the upper rubber sheet 14.

上記方法に従った保護層の成形は図４に示すような波形コード巻付け装置２０を用いることにより実現できる。この波形コード巻付け装置２０は、クラウン域外周上に複数のコード層７ａ〜７ｄからなるベルト７が既に貼り付けられたグリーンケース２２をその軸線周りに回転可能に支持する支持ドラム２４と、ディップコード供給部（図示省略）から供給された１本又は複数本（この図では４本）の直線状のディップコード２５（ディッピング処理された生コード反）をグリーンケース２２の外面に押え付ける押えロール２７と、ディップコード２５をグリーンケース２２に巻き付けると同時に、ディップコード供給部から供給された直線状のディップコード２５を波形に迂曲させる横行装置２９と、を備えるものである。横行装置２９は、供給された直線状のディップコード２５を整列させるスリット（又は穴）が形成されたヘッド部３０を有し、このスリットに直線状のディップコード２５を通しつつヘッド部３０を任意の振幅でタイヤ幅方向（図４中の矢印Ａ方向）に振動させることにより、波形コード９を形成することができる。よって、波形コード９の振幅及び波長は、横行装置２９のヘッド部３０の振り幅と支持ドラム２４によって支持されたグリーンケース２２の回転角度で制御することができる。波形コード９を螺旋状に連続して巻き付けるにあたっては、波形コード９が一周したら、１本目のコードが４本目のコードの横に、５番目のコードとして配置させるようにグリーンケース２２の回転と横行装置２０の横方向への移動量を制御する。このとき、波形コード９は１〜４本目、５〜８本目というように４本単位で巻き付けられ、タイヤ毎に打ち込み本数が同一となるように幅方向移動を制御する。そして、保護層の幅が規定に達したところで波形コード９の巻き付けが終了する。なお、タイヤへの波形コード９の打ち込み本数は、ヘッド部３０のスリット間隔を変えることで適宜変更することができる。   The formation of the protective layer according to the above method can be realized by using a corrugated cord winding apparatus 20 as shown in FIG. The corrugated cord winding apparatus 20 includes a support drum 24 that rotatably supports a green case 22 having a belt 7 composed of a plurality of cord layers 7a to 7d already attached on the outer periphery of the crown area, and a dip around the axis. Presser roll that presses one or a plurality of (four in this figure) linear dip cords 25 (dipped raw code opposite) supplied from a cord supply unit (not shown) against the outer surface of the green case 22 27 and a traversing device 29 that winds the dip cord 25 around the green case 22 and at the same time detours the linear dip cord 25 supplied from the dip cord supply unit into a waveform. The traversing device 29 has a head portion 30 in which slits (or holes) for aligning the supplied linear dip cords 25 are formed, and the head portion 30 can be arbitrarily set while passing the linear dip cords 25 through the slits. The waveform cord 9 can be formed by oscillating in the tire width direction (arrow A direction in FIG. 4) with the amplitude of. Therefore, the amplitude and wavelength of the waveform code 9 can be controlled by the swing width of the head unit 30 of the traversing device 29 and the rotation angle of the green case 22 supported by the support drum 24. When the waveform cord 9 is continuously wound in a spiral shape, when the waveform cord 9 goes around, the green cord 22 is rotated and traversed so that the first cord is arranged as the fifth cord next to the fourth cord. The amount of movement of the device 20 in the lateral direction is controlled. At this time, the waveform cord 9 is wound in units of four, such as the first to fourth and the fifth to eighth, and the movement in the width direction is controlled so that the number of driving is the same for each tire. When the width of the protective layer reaches the regulation, the winding of the waveform cord 9 is finished. In addition, the number of the waveform cords 9 driven into the tire can be appropriately changed by changing the slit interval of the head portion 30.

ここで、タイヤ幅方向に隣り合う波形コード９の山と谷とを揃える、つまり位相を同調させる手法を具体的な例を挙げて説明する。例えば、グリーンケース２２（ベルトを含む）のセンター周長が３０００ｍｍであり、波形コード９の波長を２６．５ｍｍに設定する場合、１周で作るべき波の個数は約１１３個（３０００／２６．５＝１１３．２）となる。これをグリーンケース２２の回転角度に換算すれば、グリーンケース２２が３．１８°（３６０°／１１３．２＝３．１８°）回転する間に横行装置２９のヘッド部３０が左右に１回振れるように制御すれば、グリーンケース２２の周上に亘って波形コード９の山と谷を合わせることができる。このようにグリーンケース２２の回転角度をもって制御することによって、タイヤ幅方向に異なるタイヤ周長の差も補償することができる。   Here, a method of aligning the peaks and valleys of the waveform cords 9 adjacent to each other in the tire width direction, that is, a method of synchronizing the phases will be described with a specific example. For example, when the center circumference of the green case 22 (including the belt) is 3000 mm and the wavelength of the waveform code 9 is set to 26.5 mm, the number of waves to be made in one round is about 113 (3000/26. 5 = 113.2). When this is converted into the rotation angle of the green case 22, the head portion 30 of the traversing device 29 is moved once in the right and left directions while the green case 22 rotates 3.18 ° (360 ° / 113.2 = 3.18 °). If it is controlled so as to swing, the peaks and valleys of the waveform code 9 can be matched over the circumference of the green case 22. By controlling with the rotation angle of the green case 22 in this way, it is possible to compensate for a difference in tire circumferential length that differs in the tire width direction.

この発明によれば、図５に示すような、波形コード１０１を有する保護層が、その幅と同幅のシート状のトリート１０２が長手方向の両端部にてジョイントされることにより形成された従来のタイヤ１００とは異なり、ジョイント部Ｊが形成されることがないので、保護層１１の耐久性及び保護層１１トレッド部５間の耐ピールオフ性を向上させることができる。従って、耐カット性能を十分確保しつつも、従来に比べて、トレッドの更生に際して行われ得る保護層１１の貼り替えの頻度を減らすことができ、少なくとも毎回の更生時に貼り替えを行うことを不要とすることができる。   According to the present invention, as shown in FIG. 5, a protective layer having a corrugated cord 101 is formed by jointing sheet-like treats 102 having the same width as both ends in the longitudinal direction. Unlike the tire 100, since the joint portion J is not formed, the durability of the protective layer 11 and the peel-off resistance between the tread portions 5 of the protective layer 11 can be improved. Accordingly, the frequency of replacement of the protective layer 11 that can be performed at the time of tread renewal can be reduced as compared to the conventional case while ensuring sufficient cut resistance performance, and it is not necessary to reapply at least every time rehabilitation. It can be.

しかも、この発明によれば、タイヤ幅方向に隣り合う波形コード９間の距離を相互にほぼ等しく設定することが可能となるので、つまり、図６に示すような、数本の波形コード２０１が埋設されたストリップ２０２がタイヤ周方向に螺旋状に巻き付けられて保護層２０３が形成された、比較としてのタイヤ２００とは異なり（図６の例のように、波形コード間距離がＬｗ＞Ｌｎとなることなく）、波形コード９をタイヤ幅方向に均一に配置することができるので、耐カット性をさらに向上させることができる。   In addition, according to the present invention, the distance between the waveform cords 9 adjacent in the tire width direction can be set to be approximately equal to each other, that is, several waveform cords 201 as shown in FIG. Unlike the comparative tire 200 in which the embedded strip 202 is spirally wound in the tire circumferential direction to form the protective layer 203 (as in the example of FIG. 6, the distance between the waveform cords is Lw> Ln Therefore, the corrugated cord 9 can be arranged uniformly in the tire width direction, so that the cut resistance can be further improved.

また、この発明によれば、波形コード９の振幅／波長の比率及び打ち込み本数を容易に変更することができる。なお、波形コード９は１〜４本ごとにベルトの外周に巻き付けることが好ましい。取り本数を多く設定し過ぎると波形コード９の巻き始め端ｅ１及び巻き終わり端ｅ２の幅Ｌｅが広くなり過ぎ、巻き始め端ｅ１及び巻き終わり端ｅ２におけるゴムの剥離が懸念されるからである。   Further, according to the present invention, the amplitude / wavelength ratio and the number of driving of the waveform code 9 can be easily changed. In addition, it is preferable that the waveform cord 9 is wound around the outer periphery of the belt every one to four. This is because if the number of samples is set too much, the width Le of the winding start end e1 and the winding end end e2 of the waveform cord 9 becomes too wide, and there is a concern about rubber peeling at the winding start end e1 and the winding end end e2.

波形コード９の波の振幅は７〜９ｍｍ、波長は２４〜２８ｍｍ、打ち込み本数は１５〜２０本／５０ｍｍ程度とすることが好ましい。また、直線状のディップコード２５を、ベルト７の外周への巻き付けと同時に波形に形成して波形コード９とすれば、タイヤ幅方向に隣り合う波形コード９の位相を容易に一致させることが可能となるとともに、ハンドリング性の面からも有利となる。   The amplitude of the wave of the waveform code 9 is preferably 7 to 9 mm, the wavelength is 24 to 28 mm, and the number of driving is preferably about 15 to 20/50 mm. In addition, if the linear dip cord 25 is formed into a waveform simultaneously with the winding around the outer periphery of the belt 7 to form the waveform cord 9, the phases of the waveform cords 9 adjacent in the tire width direction can be easily matched. This is also advantageous in terms of handling properties.

さらに、図２に示すように、タイヤ幅方向に沿ってみて、波形コード９の巻き始め端ｅ１と巻き終わり端ｅ２とを相互にオーバーラップさせることが好ましい。これによれば、タイヤユニフォミティを均一化できる他、タイヤ周方向に亘ってトレッドの剛性を均一化することができることから有利である。   Furthermore, as shown in FIG. 2, it is preferable that the winding start end e1 and the winding end end e2 of the waveform cord 9 overlap each other when viewed in the tire width direction. This is advantageous because the tire uniformity can be uniformed and the rigidity of the tread can be uniformed in the tire circumferential direction.

この発明の効果を確認するために、従来例１のタイヤ、この発明に従う実施例１のタイヤ、および比較例１のタイヤを用意し、保護層とトレッド間の耐ピールオフ性を以下の試験により評価した。なお各タイヤは、サイズを２７．７５×８．７５Ｒ１４．５ ２４ＰＲとした。各タイヤにおける保護層の諸元を表１に示す。各タイヤにおける保護層を構成する波形コードは、材質が芳香族ポリアミドであり、振幅が８ｍｍであり、波長が２７ｍｍである。また、各タイヤにおける保護層以外の構造等は慣例に従うものとし説明を省略する。   In order to confirm the effect of the present invention, the tire of Conventional Example 1, the tire of Example 1 according to the present invention, and the tire of Comparative Example 1 were prepared, and the peel-off resistance between the protective layer and the tread was evaluated by the following test. did. Each tire had a size of 27.75 × 8.75R14.5 24PR. Table 1 shows the specifications of the protective layer in each tire. The corrugated cord constituting the protective layer in each tire is made of aromatic polyamide, has an amplitude of 8 mm, and a wavelength of 27 mm. In addition, the structure other than the protective layer in each tire conforms to the custom, and the description is omitted.

Figure 2010111084
Figure 2010111084

（保護層―トレッド間の剥離耐久性の試験条件）
ドラム試験機上にて、以下の条件における離陸試験を各荷重において１０回ずつ繰り返し実施し、タイヤの故障が発生するまでの試験回数を測定した。
内圧：規定内圧
速度：規定速度
荷重及び試験回数：１００％規定荷重×１０回、１１０％規定荷重×１０回、１２０％規定荷重×１０回、１３０％規定荷重×１０回、１４０％規定荷重×１０回、１６０％規定荷重×１０回
走行時間：６０秒
判定方法：耐久回数が多いほど耐ピールオフ性が良好と判定
ここで、規定内圧、規定荷重は、TRA (THE TIRE and RIM ASSOCIATION INC.) 2000 YEAR BOOKに従うものである。 (Test conditions for peeling durability between protective layer and tread)
On the drum tester, the take-off test under the following conditions was repeated 10 times for each load, and the number of tests until a tire failure occurred was measured.
Internal pressure: Specified internal pressure Speed: Specified speed load and number of tests: 100% specified load x 10 times, 110% specified load x 10 times, 120% specified load x 10 times, 130% specified load x 10 times, 140% specified load x 10 times, 160% specified load x 10 times Travel time: 60 seconds Judgment method: The more the number of endurance times, the better the peel-off resistance. Here, the specified internal pressure and specified load are TRA (THE TIRE and RIM ASSOCIATION INC.) Complies with 2000 YEAR BOOK.

保護層―トレッド間の剥離耐久性の試験の結果、実施例１のタイヤは完走したのに対し、従来例１のタイヤは１６０％荷重の３回目で故障が発生し、比較例１のタイヤでは１５０％荷重の８回目で故障が発生した。   As a result of the durability test between the protective layer and the tread, the tire of Example 1 completed running, whereas the tire of Conventional Example 1 failed at the third load of 160% load, and the tire of Comparative Example 1 A failure occurred at the eighth time of 150% load.

この発明により、耐カット性能を十分確保しつつも、保護層の耐久性を高めて、トレッドゴムの更生に際して行われ得る保護層の貼り替えの頻度を減らすことが可能となった。   According to the present invention, it is possible to increase the durability of the protective layer while ensuring sufficient cut resistance, and to reduce the frequency of the protective layer being replaced when the tread rubber is rehabilitated.

この発明に従う代表的な航空機用ラジアルタイヤのタイヤ幅方向断面図である。1 is a cross-sectional view in the tire width direction of a typical radial aircraft tire according to the present invention. 図１の航空機用ラジアルタイヤのクラウン部に位置するベルトからトレッド部までの各部材の積層状態を示した概略図である。It is the schematic which showed the lamination | stacking state of each member from the belt located in the crown part of the radial tire for aircraft of FIG. 1 to a tread part. グリーンタイヤのタイヤ幅方向断面を示す概略断面図である。It is a schematic sectional drawing which shows the tire width direction cross section of a green tire. この発明に好適に用いることができる波形コード巻付け装置を示す図であり、（ａ）は側面図、（ｂ）は平面図である。It is a figure which shows the waveform cord winding apparatus which can be used suitably for this invention, (a) is a side view, (b) is a top view. 従来技術に従う航空機用ラジアルタイヤのクラウン部に位置するベルトからトレッド部までの各部材の積層状態を示した概略図である。It is the schematic which showed the lamination | stacking state of each member from the belt located in the crown part of the radial tire for aircrafts according to a prior art to a tread part. 比較としての航空機用ラジアルタイヤのクラウン部に位置するベルトからトレッド部までの各部材の積層状態を示した概略図である。It is the schematic which showed the lamination | stacking state of each member from the belt located in the crown part of the radial tire for aircraft as a comparison to a tread part.

符号の説明Explanation of symbols

１ タイヤ
２ ビードコア
３ ビード部
４ サイドウォール部
５ トレッド部
６ カーカス
７ ベルト
９ 波形コード
１１ 保護層
１３ 下側ゴムシート
１４ 上側ゴムシート
１６ トップトレッド
２０ 波形コード巻付け装置
２２ グリーンケース
２４ 支持ドラム
２５ ディップコード
２９ 横行装置
３０ ヘッド部 DESCRIPTION OF SYMBOLS 1 Tire 2 Bead core 3 Bead part 4 Side wall part 5 Tread part 6 Carcass 7 Belt 9 Corrugated cord 11 Protective layer 13 Lower rubber sheet 14 Upper rubber sheet 16 Top tread 20 Corrugated cord winding device 22 Green case 24 Support drum 25 Dip Code 29 Traversing device 30 Head

Claims (4)

一対のビードコアと、該ビードコア間にトロイド状に延在する少なくとも１枚のカーカスプライよりなるラジアルカーカスと、該ラジアルカーカスのクラウン部外周とタイヤのトレッドとの間に配置された少なくとも１枚のベルト層よりなるベルトと、該ベルトと前記トレッドとの間に配置されて該ベルトを覆う保護層とを備えた航空機用ラジアルタイヤの製造方法において、
前記保護層を成形するにあたり、前記ベルトの成形後に、該ベルトの外周へディップコードを波形に迂曲した状態でタイヤ周方向に螺旋状に連続して巻き付けることを特徴とする航空機用ラジアルタイヤの製造方法。 A pair of bead cores, a radial carcass made of at least one carcass ply extending in a toroid shape between the bead cores, and at least one belt disposed between the outer periphery of the crown of the radial carcass and the tread of the tire In a method for manufacturing a radial tire for an aircraft, comprising: a belt composed of a layer; and a protective layer disposed between the belt and the tread and covering the belt.
When forming the protective layer, a radial tire for an aircraft is manufactured, wherein after forming the belt, a dip cord is wound around the outer periphery of the belt in a spiral shape continuously in a tire circumferential direction. Method. 前記ディップコードを、前記ベルトの外周への巻き付けと同時に波形に成形する、請求項１に記載の航空機用ラジアルタイヤの製造方法。   The method for manufacturing a radial tire for an aircraft according to claim 1, wherein the dip cord is formed into a waveform simultaneously with the winding of the belt around the outer periphery. 前記ディップコードを１〜４本ごとに前記ベルトの外周に巻き付ける、請求項１又は２に記載の航空機用ラジアルタイヤの製造方法。   The method for manufacturing a radial tire for an aircraft according to claim 1 or 2, wherein the dip cord is wound around the outer periphery of the belt every 1 to 4 dip cords. 一対のビードコアと、該ビードコア間にトロイド状に延在する少なくとも１枚のカーカスプライよりなるラジアルカーカスと、このラジアルカーカスのクラウン部外周とタイヤのトレッドとの間に配置された少なくとも１枚のベルト層よりなるベルトと、該ベルトと前記トレッドとの間に配置されて該ベルトを覆う保護層とを備えた航空機用ラジアルタイヤにおいて、
前記保護層は、波形に迂曲しつつ、前記ベルトの外周に螺旋状に連続して巻き付けられた少なくとも１本のディップコードで構成されることを特徴とする航空機用ラジアルタイヤ。 A pair of bead cores, a radial carcass made of at least one carcass ply extending in a toroidal shape between the bead cores, and at least one belt disposed between the outer periphery of the crown of the radial carcass and the tread of the tire In an aircraft radial tire comprising a belt composed of layers, and a protective layer disposed between the belt and the tread and covering the belt,
The radial tire for an aircraft according to claim 1, wherein the protective layer includes at least one dip cord that is continuously wound in a spiral shape around the outer periphery of the belt while being bent in a waveform.
JP2008287596A 2008-11-10 2008-11-10 Radial tire manufacturing method and aircraft radial tire Expired - Fee Related JP5350751B2 (en)

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