JP2003146010A - Pneumatic radial tire - Google Patents
Pneumatic radial tireInfo
- Publication number
- JP2003146010A JP2003146010A JP2001345853A JP2001345853A JP2003146010A JP 2003146010 A JP2003146010 A JP 2003146010A JP 2001345853 A JP2001345853 A JP 2001345853A JP 2001345853 A JP2001345853 A JP 2001345853A JP 2003146010 A JP2003146010 A JP 2003146010A
- Authority
- JP
- Japan
- Prior art keywords
- belt
- layer
- fiber cord
- belt layer
- pneumatic radial
- 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
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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0042—Reinforcements made of synthetic materials
-
- 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ポリオレフィンケ
トンの繊維コードをベルトカバー層に用いた空気入りラ
ジアルタイヤに関し、更に詳しくは、有機繊維コードを
ベルト層に用いた場合の不都合を解消するようにした空
気入り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 pneumatic radial tire using a polyolefin ketone fiber cord in a belt cover layer, and more specifically, to solve the disadvantages of using an organic fiber cord in the belt layer. Pneumatic radial tires.
【０００２】[0002]
【従来の技術】タイヤの軽量化の手段として、スチール
コードの替わりに高弾性の有機繊維コードをベルト層に
用いることが提案されている。しかしながら、有機繊維
ベルト層を形成した場合、スチールベルト層と比較して
トレッド部の剛性が低くなるため、タイヤ特性が損なわ
れる傾向がある。その改善策として、ベルト層の外周側
にベルトカバー層を設置することが考えられるが、従来
のナイロン繊維では改善効果が不十分であった。そこ
で、アラミド並の物性とナイロン並の接着特性を有する
ポリオレフィンケトンの繊維コードをベルトカバー層に
用いることが考えられるが、このような繊維コードの使
用に際して、タイヤの重量増加を防ぎつつ、高速耐久
性、乗り心地、ロードノイズ等のタイヤ性能についても
十分な配慮が必要である。2. Description of the Related Art As a means for reducing the weight of a tire, it has been proposed to use a highly elastic organic fiber cord instead of a steel cord in a belt layer. However, when the organic fiber belt layer is formed, the rigidity of the tread portion becomes lower than that of the steel belt layer, so that the tire characteristics tend to be impaired. As a remedy for this, it is conceivable to install a belt cover layer on the outer peripheral side of the belt layer, but conventional nylon fibers have not been sufficiently effective. Therefore, it is conceivable to use a polyolefin ketone fiber cord with physical properties similar to aramid and adhesive properties similar to nylon for the belt cover layer.However, when using such a fiber cord, it is possible to prevent tire weight increase and to achieve high-speed durability. It is also necessary to give sufficient consideration to tire performance such as performance, riding comfort and road noise.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、タイ
ヤの重量増加を防ぎつつ、高速耐久性と乗り心地とロー
ドノイズとをバランス良く改善することを可能にした空
気入りラジアルタイヤを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a pneumatic radial tire capable of improving high-speed durability, riding comfort and road noise in a well-balanced manner while preventing an increase in tire weight. Especially.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
の本発明の空気入りラジアルタイヤは、左右一対のビー
ド部間にカーカス層を装架し、トレッド部における前記
カーカス層の外周側に引張り強度２．０ＧＰａ以上、弾
性率７０ＧＰａ以上の有機繊維コードを用いた少なくと
も１層の有機繊維ベルト層を含む複数層のベルト層を埋
設した空気入りラジアルタイヤにおいて、前記ベルト層
の外周側に、下記（１）式で表される構造を有するポリ
オレフィンケトンのフィラメントからなる繊維コードを
用いたベルトカバー層を配置し、該ベルトカバー層を構
成する繊維コードの強度が１０ｇ／Ｄ以上で、２．２５
ｇ／Ｄ時の伸び率が３．５％以下であることを特徴とす
るものである。In the pneumatic radial tire of the present invention for achieving the above object, a carcass layer is mounted between a pair of left and right bead portions, and the carcass layer is pulled on the outer peripheral side of the tread portion. In a pneumatic radial tire in which a plurality of belt layers including at least one organic fiber belt layer using an organic fiber cord having a strength of 2.0 GPa or more and an elastic modulus of 70 GPa or more is embedded, the following is provided on the outer peripheral side of the belt layer. A belt cover layer using a fiber cord composed of a filament of polyolefin ketone having a structure represented by the formula (1) is arranged, and the strength of the fiber cord constituting the belt cover layer is 10 g / D or more and 2.25.
The elongation is 3.5% or less at g / D.
【０００５】
−（ＣＨ2 −ＣＨ2 −ＣＯ）ｎ−（Ｒ−ＣＯ）ｍ− ・・・（１）
ここで、１．０５≧（ｎ＋ｍ）／ｎ≧１．００、Ｒは炭
素数が３以上のアルキレン基である。-(CH 2 -CH 2 -CO) n- (R-CO) m- (1) Here, 1.05 ≧ (n + m) /n≧1.00, and R has a carbon number. It is an alkylene group of 3 or more.
【０００６】このように高弾性の有機繊維コードからな
るベルト層を備えた空気入りラジアルタイヤにおいて、
特定の条件を満足するポリオレフィンケトンの繊維コー
ドからなるベルトカバー層を用いることにより、タイヤ
の重量増加を防ぎつつ、高速耐久性と乗り心地とロード
ノイズとをバランス良く改善することができる。In the pneumatic radial tire provided with the belt layer made of the highly elastic organic fiber cord as described above,
By using a belt cover layer made of a polyolefin ketone fiber cord that satisfies specific conditions, it is possible to improve the high-speed durability, riding comfort and road noise in a well-balanced manner while preventing an increase in tire weight.
【０００７】本発明において、タイヤの重量増加を増加
させることなく、高速耐久性と乗り心地とロードノイズ
とを同時に改善するために、ベルトカバー層の繊維コー
ドは５００Ｄ〜１５００Ｄのフィラメント束を１本以上
撚り合わせたものであることが好ましい。また、ベルト
カバー層は少なくともベルト層の両端部から突き出すよ
うに配置することが好ましい。In the present invention, in order to improve high-speed durability, riding comfort and road noise at the same time without increasing the weight of the tire, the fiber cord of the belt cover layer is one filament bundle of 500D to 1500D. It is preferable that the above are twisted together. Further, the belt cover layer is preferably arranged so as to project from at least both ends of the belt layer.
【０００８】本発明では、便宜上、繊維コードの太さと
してデニールを用いているが、このデニールは１Ｄ＝
１．１１１dtexの関係に基づいてデシテックスに変換す
ることが可能である。In the present invention, denier is used as the thickness of the fiber cord for convenience, but this denier is 1D =
It is possible to convert to decitex based on the relationship of 1.111 dtex.
【０００９】[0009]
【発明の実施の形態】以下、本発明の構成について添付
の図面を参照して詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION The structure of the present invention will be described in detail below with reference to the accompanying drawings.
【００１０】図１は本発明の実施形態からなる空気入り
ラジアルタイヤを示し、１はトレッド部、２はサイドウ
ォール部、３はビード部である。左右一対のビード部
３，３間にはカーカス層４が装架され、そのカーカス層
４の端部がビードコア５の廻りにタイヤ内側から外側に
折り返されている。トレッド部１におけるカーカス層４
の外周側には２層のベルト層６ａ，６ｂが埋設されてい
る。タイヤ内側に位置するベルト層６ａは複数本のスチ
ールコードを引き揃えたものであり、タイヤ外側に位置
するベルト層６ｂは複数本の有機繊維コードを引き揃え
たものである。これらベルト層６ａ，６ｂはコードがタ
イヤ周方向に対して傾斜し、かつ層間でコードが互いに
交差するように配置されている。ベルト層６ｂを構成す
る有機繊維コードには、アラミド繊維に代表される引張
り強度２．０ＧＰａ以上、弾性率７０ＧＰａ以上の有機
繊維コードが使用されている。FIG. 1 shows a pneumatic radial tire according to an embodiment of the present invention, in which 1 is a tread portion, 2 is a sidewall portion, and 3 is a bead portion. A carcass layer 4 is mounted between the pair of left and right bead portions 3, 3 and an end portion of the carcass layer 4 is folded back around the bead core 5 from the tire inner side to the tire outer side. Carcass layer 4 in the tread portion 1
Two belt layers 6a and 6b are embedded on the outer peripheral side of the. The belt layer 6a located inside the tire is formed by aligning a plurality of steel cords, and the belt layer 6b located outside the tire is formed by aligning a plurality of organic fiber cords. The belt layers 6a and 6b are arranged such that the cords are inclined with respect to the tire circumferential direction and the cords intersect each other between the layers. An organic fiber cord having a tensile strength of 2.0 GPa or more and an elastic modulus of 70 GPa or more, which is represented by an aramid fiber, is used as the organic fiber cord forming the belt layer 6b.
【００１１】但し、本発明では少なくとも１層の有機繊
維ベルト層を備えていれば良く、全てのベルト層に有機
繊維コードを用いたり、必要に応じてベルト層の総数を
増やすことも可能である。いずれの場合も、従来から使
用されているベルト層のスチールコードを上記物性の有
機繊維コードに置き換えることでタイヤの軽量化が可能
になる。However, in the present invention, it is sufficient that at least one organic fiber belt layer is provided, and it is possible to use organic fiber cords for all belt layers or increase the total number of belt layers as necessary. . In any case, it is possible to reduce the weight of the tire by replacing the steel cord of the belt layer which has been conventionally used with the organic fiber cord having the above physical properties.
【００１２】上記空気入りラジアルタイヤにおいて、ベ
ルト層６ａ，６ｂの外周側には、ポリオレフィンケトン
の繊維コードをタイヤ周方向に配向してなるベルトカバ
ー層７が配置されている。このベルトカバー層７は少な
くとも１本の繊維コードを引き揃えてゴム被覆してなる
リボン材をタイヤ周方向に対して実質的に０°で連続的
に巻回したジョイントレス構造とすることが望ましい。
また、ベルトカバー層７は、ベルト層６ａ，６ｂを全幅
にわたって覆うフルカバーと、ベルト層６ａ，６ｂの両
端部だけを覆うエッジカバーとから構成すると良い。In the above pneumatic radial tire, a belt cover layer 7 formed by orienting fiber cords of polyolefin ketone in the tire circumferential direction is arranged on the outer peripheral sides of the belt layers 6a and 6b. The belt cover layer 7 preferably has a jointless structure in which at least one fiber cord is aligned and rubber-coated with a ribbon material and continuously wound at substantially 0 ° with respect to the tire circumferential direction. .
Further, the belt cover layer 7 may be composed of a full cover that covers the belt layers 6a and 6b over the entire width and an edge cover that covers only both ends of the belt layers 6a and 6b.
【００１３】ベルトカバー層７はベルト層６ａ，６ｂを
押さえ込む作用を持っているが、その作用を高めるため
に、ベルトカバー層７を少なくともベルト層６ａ，６ｂ
の幅方向両端部から外側へ突き出すように配置すること
が望ましい。The belt cover layer 7 has a function of pressing down the belt layers 6a and 6b, but in order to enhance the function, the belt cover layer 7 is at least belt layers 6a and 6b.
It is desirable to arrange so as to project outward from both ends in the width direction.
【００１４】ここで用いるポリオレフィンケトン繊維
は、特開平１−１２４６１７号公報、特開平２−１１２
４１３号公報、米国特許第５１９４２１０号公報、特開
平９−３２４３７７号公報、特開２００１−１１５００
７号公報、特開２００１−１３１８２５号公報などで開
示された溶融紡糸や湿式紡糸によって得ることができる
が、下記（１）式で表される構造を有するポリオレフィ
ンケトン繊維を用いることが必要である。The polyolefin ketone fiber used here is disclosed in JP-A-1-124617 and JP-A-2-112.
413, U.S. Pat. No. 5,194,210, JP-A-9-324377, and JP-A-2001-11500.
It can be obtained by melt spinning or wet spinning disclosed in JP-A No. 7, JP-A-2001-131825, etc., but it is necessary to use a polyolefin ketone fiber having a structure represented by the following formula (1). .
【００１５】
−（ＣＨ2 −ＣＨ2 −ＣＯ）ｎ−（Ｒ−ＣＯ）ｍ− ・・・（１）
ここで、１．０５≧（ｎ＋ｍ）／ｎ≧１．００、Ｒは炭
素数が３以上のアルキレン基である。[0015] - (CH 2 -CH 2 -CO) n- (R-CO) m- ··· (1) Here, 1.05 ≧ (n + m) /n≧1.00,R carbon atoms It is an alkylene group of 3 or more.
【００１６】（１）式において、ｍの分率（エチレン以
外のアルキレンユニット）が増えると、タイヤの走行成
長が大きくなり、耐久性が低下する。これは、紡糸繊維
の結晶構造がｍユニットの増加により変化し、分子鎖間
の二次結合力が低下するためと考えられる。また、該繊
維の強度が低くなると撚りコードとした時に更に強度が
低下するので、タイヤの破壊強度を確保するためにコー
ドの使用量を多くする必要があり、軽量で経済性の高い
タイヤの提供が困難となる。ここでより好ましくはｍ＝
０である実質的にエチレンと一酸化炭素だけからなる交
互共重合ポリマーを用いるのが良い。このような繊維を
製造するには湿式紡糸を用いるのが好適である。In the equation (1), when the fraction of m (alkylene unit other than ethylene) increases, the running growth of the tire increases and the durability decreases. It is considered that this is because the crystal structure of the spun fiber is changed by the increase of m units and the secondary bonding force between the molecular chains is reduced. Further, when the strength of the fiber becomes low, the strength is further reduced when it is formed into a twisted cord. Therefore, it is necessary to increase the amount of the cord used in order to secure the breaking strength of the tire, and to provide a lightweight and highly economical tire Will be difficult. Here, more preferably m =
It is advisable to use an alternating copolymer of 0 which consists essentially of ethylene and carbon monoxide. Wet spinning is preferably used to produce such fibers.
【００１７】更に、ポリオレフィンケトンの繊維コード
としては、引張り強度が１０ｇ／Ｄ以上で、２．２５ｇ
／Ｄ時の伸び率が３．５％以下である繊維コードを用い
ることが必要である。引張り強度が１０ｇ／Ｄ未満であ
ると繊維コードの打ち込み本数を増加させたり、コード
の太さを太くする必要がある。ところが、打ち込み数が
多過ぎるとコード間のゴムが実質的に存在しない状態と
なり、ベルトカバー層と周りのゴムと間での接着破壊が
生じ易くなり耐久性が低下する。一方、コードが太くな
るとベルトカバー層が厚くなり軽量性の確保が困難とな
る。また、２．２５ｇ／Ｄ時の伸び率が３．５％を超え
ると高速走行時のタイヤ径方向の成長が大きくなり高速
耐久性が低下する。Further, the fiber cord of polyolefin ketone has a tensile strength of 10 g / D or more and 2.25 g.
It is necessary to use a fiber cord having an elongation at 3.5 / D of 3.5% or less. If the tensile strength is less than 10 g / D, it is necessary to increase the number of fiber cords to be driven and to increase the thickness of the cord. However, if the number of driving is too large, the rubber between the cords is substantially absent, and the adhesive breakage between the belt cover layer and the rubber around the cord is likely to occur, and the durability is deteriorated. On the other hand, as the cord becomes thicker, the belt cover layer becomes thicker and it becomes difficult to secure the lightness. Further, if the elongation percentage at 2.25 g / D exceeds 3.5%, the growth in the tire radial direction at high speed running becomes large and the high speed durability deteriorates.
【００１８】上記ポリオレフィンケトンの繊維コード
は、５００Ｄ〜１５００Ｄのフィラメント束を１本以上
撚り合わせたものであることが好ましい。フィラメント
束の太さが５００Ｄ未満であると高速耐久性が不十分に
なり、逆に１５００Ｄを超えると剛性が上がり過ぎて乗
り心地が悪化する。なお、コードの総デニール数は３０
００Ｄ以下にすると良い。It is preferable that the fiber cord of the polyolefin ketone is formed by twisting one or more filament bundles of 500D to 1500D. If the thickness of the filament bundle is less than 500D, the high-speed durability becomes insufficient, and conversely, if it exceeds 1500D, the rigidity becomes too high and the riding comfort deteriorates. The total number of denier cords is 30
It should be set to 00D or less.
【００１９】また、ポリオレフィンケトンの繊維コード
は、Ｋ＝Ｔ√Ｄで表される撚り係数Ｋが１０００〜３５
００の範囲であることが好ましい。ここでＫは撚り係
数、Ｔはコードの上撚り数（回／１０ｃｍ）、Ｄはコー
ドの総デニール数である。撚り係数Ｋが１０００未満で
あると耐疲労性の確保が困難となるばかりでなく、破断
伸びが低下して耐外傷性が悪化する。撚り係数Ｋが３５
００を超えるとモジュラスの低下が大きく高速耐久性の
確保が困難となる。The fiber cord of polyolefin ketone has a twist coefficient K represented by K = T√D of 1000 to 35.
It is preferably in the range of 00. Here, K is the twist coefficient, T is the number of twists (10/10 cm) of the cord, and D is the total number of denier of the cord. If the twist coefficient K is less than 1000, not only it becomes difficult to ensure fatigue resistance, but also the elongation at break decreases and the external damage resistance deteriorates. Twisting factor K is 35
If it exceeds 00, the modulus is largely lowered and it becomes difficult to secure high-speed durability.
【００２０】[0020]
【実施例】タイヤサイズ２０５／５０Ｒ１５とし、下記
材料を用いて実施例１〜１０及び比較例１〜３の空気入
りラジアルタイヤをそれぞれ製作した。EXAMPLES Pneumatic radial tires of Examples 1 to 10 and Comparative Examples 1 to 3 were manufactured by using tires having a tire size of 205 / 50R15 and the following materials.
【００２１】ベルトカバー層の材料：
６６Ｎ：ナイロン６６
強度７．４ｇ／Ｄ、２．２５ｇ／Ｄ時の伸び率８．０％
ＰＯＫ１：ポリオレフィンケトン （ｎ＋ｍ）／ｎ＝
１．０７、強度１０．５ｇ／Ｄ、２．２５ｇ／Ｄ時の伸
び率２．９％、撚り係数１５００
ＰＯＫ２：ポリオレフィンケトン （ｎ＋ｍ）／ｎ＝
１．００、強度１３．４ｇ／Ｄ、２．２５ｇ／Ｄ時の伸
び率２．１％、撚り係数２０００
ＰＯＫ３：ポリオレフィンケトン （ｎ＋ｍ）／ｎ＝
１．００、強度１４．４ｇ／Ｄ、２．２５ｇ／Ｄ時の伸
び率１．６％、撚り係数１５００
ＰＯＫ４：ポリオレフィンケトン （ｎ＋ｍ）／ｎ＝
１．００、強度１２．１ｇ／Ｄ、２．２５ｇ／Ｄ時の伸
び率３．５％、撚り係数３５００
ベルト層の材料：
スチールベルト層：スチールコードの引張り強度３．０
ＧＰａ、弾性率１６０ＧＰａ
有機繊維ベルト層：アラミドコードの引張り強度２．７
ＧＰａ、弾性率７１ＧＰａ
比較例１：内側ベルト層として幅１９０ｍｍのスチール
ベルト層を使用し、外側ベルト層として幅１８０ｍｍの
有機繊維ベルト層を使用し、ベルト層全体を覆う幅１９
０ｍｍのベルトカバー層（フルカバー）に１２６０Ｄ／
２の繊維コード６６Ｎを用い、ベルト層の両端部を覆う
幅３０ｍｍのベルトカバー層（エッジカバー）に１２６
０Ｄ／２の繊維コード６６Ｎを用いた。Material of the belt cover layer: 66N: Nylon 66 Strength 7.4 g / D, elongation rate at 2.25 g / D 8.0% POK1: Polyolefin ketone (n + m) / n =
1.07, strength 10.5 g / D, elongation at 2.25 g / D 2.9%, twist coefficient 1500 POK2: polyolefin ketone (n + m) / n =
1.00, strength 13.4 g / D, elongation at 2.25 g / D 2.1%, twist coefficient 2000 POK3: polyolefin ketone (n + m) / n =
1.00, strength 14.4 g / D, elongation rate at 2.25 g / D 1.6%, twist coefficient 1500 POK4: polyolefin ketone (n + m) / n =
1.00, strength 12.1 g / D, elongation rate at 2.25 g / D 3.5%, twist coefficient 3500 Belt layer material: Steel belt layer: Steel cord tensile strength 3.0
GPa, elastic modulus 160 GPa organic fiber belt layer: tensile strength of aramid cord 2.7
GPa, elastic modulus 71 GPa Comparative Example 1: A steel belt layer having a width of 190 mm was used as the inner belt layer, an organic fiber belt layer having a width of 180 mm was used as the outer belt layer, and a width 19 covering the entire belt layer was used.
1260D / on the 0mm belt cover layer (full cover)
Using the fiber cord 66N of No. 2, 126 in a belt cover layer (edge cover) with a width of 30 mm that covers both ends of the belt layer.
Fiber cord 66N of 0D / 2 was used.
【００２２】実施例１：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅２００ｍｍの２層のベルトカバー層（フルカバ
ー）に５００Ｄ／１の繊維コードＰＯＫ３を用い、ベル
ト層の両端部を覆う幅３０ｍｍ，３５ｍｍの２層のベル
トカバー層（エッジカバー）に５００Ｄ／１の繊維コー
ドＰＯＫ３を用いた。Example 1: 190 m wide as an inner belt layer
m steel belt layer, an outer belt layer of 180 mm wide organic fiber belt layer, and a 200 mm wide two-layer belt cover layer (full cover) covering the entire belt layer with 500D / 1 fiber cord POK3 Was used, and 500 D / 1 fiber cord POK3 was used for two belt cover layers (edge covers) having widths of 30 mm and 35 mm that cover both ends of the belt layer.
【００２３】実施例２：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅２００ｍｍのベルトカバー層（フルカバー）に
５００Ｄ／２の繊維コードＰＯＫ３を用い、ベルト層の
両端部を覆う幅３５ｍｍのベルトカバー層（エッジカバ
ー）に５００Ｄ／２の繊維コードＰＯＫ３を用いた。Example 2: 190 m wide as the inner belt layer
Using a steel belt layer of m, an organic fiber belt layer having a width of 180 mm as an outer belt layer, a belt cover layer (full cover) having a width of 200 mm that covers the entire belt layer, and a fiber cord POK3 of 500D / 2 is used. The fiber cord POK3 of 500D / 2 was used for the belt cover layer (edge cover) having a width of 35 mm that covers both ends of the belt layer.
【００２４】実施例３：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅２００ｍｍのベルトカバー層（フルカバー）に
１０００Ｄ／２の繊維コードＰＯＫ３を用い、ベルト層
の両端部を覆う幅２０ｍｍのベルトカバー層（エッジカ
バー）に１０００Ｄ／２の繊維コードＰＯＫ３を用い
た。Example 3: 190 m width as inner belt layer
Using a steel belt layer of m, an organic fiber belt layer having a width of 180 mm as an outer belt layer, and using a belt code layer POK3 of 1000 D / 2 for a belt cover layer (full cover) having a width of 200 mm that covers the entire belt layer, 1000 D / 2 fiber cord POK3 was used for a belt cover layer (edge cover) having a width of 20 mm that covers both ends of the belt layer.
【００２５】実施例４：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅１９０ｍｍのベルトカバー層（フルカバー）に
１０００Ｄ／２の繊維コードＰＯＫ３を用い、ベルト層
の両端部を覆う幅２０ｍｍのベルトカバー層（エッジカ
バー）に１０００Ｄ／２の繊維コードＰＯＫ３を用い
た。Example 4: 190 m width as inner belt layer
m steel belt layer, the outer belt layer is an organic fiber belt layer having a width of 180 mm, and the belt cover layer (full cover) having a width of 190 mm covering the entire belt layer is 1000 D / 2 fiber cord POK3. 1000 D / 2 fiber cord POK3 was used for a belt cover layer (edge cover) having a width of 20 mm that covers both ends of the belt layer.
【００２６】実施例５：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅２００ｍｍのベルトカバー層（フルカバー）に
１５００Ｄ／２の繊維コードＰＯＫ３を用い、ベルト層
の両端部を覆う幅２０ｍｍのベルトカバー層（エッジカ
バー）に１５００Ｄ／２の繊維コードＰＯＫ３を用い
た。Example 5: 190 m wide as the inner belt layer
m steel belt layer, an outer belt layer is a 180 mm wide organic fiber belt layer, and a 200 mm wide belt cover layer (full cover) covering the entire belt layer is 1500 D / 2 fiber cord POK3. A 1500 D / 2 fiber cord POK3 was used for a belt cover layer (edge cover) having a width of 20 mm that covers both ends of the belt layer.
【００２７】実施例６：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅１９０ｍｍのベルトカバー層（フルカバー）に
１２６０Ｄ／２の繊維コード６６Ｎを用い、ベルト層の
両端部を覆う幅２０ｍｍのベルトカバー層（エッジカバ
ー）に１０００Ｄ／２の繊維コードＰＯＫ３を用いた。Example 6: 190 m width as inner belt layer
m steel belt layer is used, an outer belt layer is an organic fiber belt layer having a width of 180 mm, and a belt cover layer (full cover) having a width of 190 mm that covers the entire belt layer is a fiber cord 66N of 1260D / 2. 1000 D / 2 fiber cord POK3 was used for a belt cover layer (edge cover) having a width of 20 mm that covers both ends of the belt layer.
【００２８】実施例７：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅２００ｍｍのベルトカバー層（フルカバー）に
１０００Ｄ／２の繊維コードＰＯＫ２を用い、ベルト層
の両端部を覆う幅２０ｍｍのベルトカバー層（エッジカ
バー）に１０００Ｄ／２の繊維コードＰＯＫ２を用い
た。Example 7: Width 190 m as inner belt layer
m steel belt layer, an outer belt layer is a 180 mm wide organic fiber belt layer, and a 200 mm wide belt cover layer (full cover) covering the entire belt layer is 1000 D / 2 fiber cord POK2. The fiber cord POK2 of 1000D / 2 was used for the belt cover layer (edge cover) having a width of 20 mm that covers both ends of the belt layer.
【００２９】比較例２：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅２００ｍｍのベルトカバー層（フルカバー）に
５００Ｄ／２の繊維コードＰＯＫ１を用い、ベルト層の
両端部を覆う幅３５ｍｍのベルトカバー層（エッジカバ
ー）に５００Ｄ／２の繊維コードＰＯＫ１を用いた。Comparative Example 2: 190 m width as inner belt layer
Using a steel belt layer of m, an organic fiber belt layer having a width of 180 mm as an outer belt layer, and using a fiber cord POK1 of 500 D / 2 for a belt cover layer (full cover) having a width of 200 mm that covers the entire belt layer, A fiber cord POK1 of 500D / 2 was used for a belt cover layer (edge cover) having a width of 35 mm which covers both ends of the belt layer.
【００３０】実施例８：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅２００ｍｍのベルトカバー層（フルカバー）に
２０００Ｄ／２の繊維コードＰＯＫ３を用い、ベルト層
の両端部を覆う幅２０ｍｍのベルトカバー層（エッジカ
バー）に２０００Ｄ／２の繊維コードＰＯＫ４を用い
た。Example 8: Width 190 m as inner belt layer
Using a steel belt layer of m, an organic fiber belt layer having a width of 180 mm as an outer belt layer, and using a fiber cord POK3 of 2000 D / 2 for a belt cover layer (full cover) having a width of 200 mm that covers the entire belt layer, A 2000 D / 2 fiber cord POK4 was used for a belt cover layer (edge cover) having a width of 20 mm that covers both ends of the belt layer.
【００３１】実施例９：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全体
を覆う幅１９０ｍｍのベルトカバー層（フルカバー）に
１２６０Ｄ／２の繊維コード６６Ｎを用い、ベルト層の
両端部を覆う幅２０ｍｍのベルトカバー層（エッジカバ
ー）とベルト層の中央２か所を覆う幅１０ｍｍのベルト
カバー層に１０００Ｄ／２の繊維コードＰＯＫ３を用い
た。Example 9: 190 m wide as the inner belt layer
m steel belt layer is used, an outer belt layer is an organic fiber belt layer having a width of 180 mm, and a belt cover layer (full cover) having a width of 190 mm that covers the entire belt layer is a fiber cord 66N of 1260D / 2. A 1000 D / 2 fiber cord POK3 was used for a belt cover layer (edge cover) having a width of 20 mm that covers both ends of the belt layer and a belt cover layer having a width of 10 mm that covers two central portions of the belt layer.
【００３２】実施例１０：内側ベルト層として幅１９０
ｍｍの有機繊維ベルト層を使用し、外側ベルト層として
幅１８０ｍｍの有機繊維ベルト層を使用し、ベルト層全
体を覆う幅２００ｍｍ，１９０ｍｍの２層のベルトカバ
ー層（フルカバー）に１０００Ｄ／２の繊維コードＰＯ
Ｋ３を用い、ベルト層の両端部を覆う幅２０ｍｍのベル
トカバー層（エッジカバー）に１０００Ｄ／２の繊維コ
ードＰＯＫ３を用いた。Example 10: Width 190 as inner belt layer
mm of the organic fiber belt layer and the outer belt layer of the 180 mm width organic fiber belt layer are used, and the two belt cover layers (full cover) of 200 mm and 190 mm in width to cover the entire belt layer have a thickness of 1000 D / 2. Fiber code PO
K3 was used, and 1000 D / 2 fiber cord POK3 was used for a belt cover layer (edge cover) having a width of 20 mm that covers both ends of the belt layer.
【００３３】比較例３：内側ベルト層として幅１９０ｍ
ｍのスチールベルト層を使用し、外側ベルト層として幅
１８０ｍｍのスチールベルト層を使用し、ベルト層全体
を覆う幅１９０ｍｍのベルトカバー層（フルカバー）に
１２６０Ｄ／２の繊維コード６６Ｎを用い、ベルト層の
両端部を覆う幅３０ｍｍのベルトカバー層（エッジカバ
ー）に１２６０Ｄ／２の繊維コード６６Ｎを用いた。Comparative Example 3: 190 m width as inner belt layer
m steel belt layer, a 180 mm wide steel belt layer is used as an outer belt layer, and a belt cover layer (full cover) having a width of 190 mm that covers the entire belt layer is used with a fiber cord 66N of 1260D / 2. A 1260D / 2 fiber cord 66N was used for a belt cover layer (edge cover) having a width of 30 mm that covers both ends of the layer.
【００３４】これら試験タイヤについて、ベルトカバー
層の重量及びタイヤ重量を測定すると共に、下記の方法
により、高速耐久性、乗り心地、ロードノイズを評価
し、その結果を表１に示した。ベルトカバー層の重量及
びタイヤ重量については、基準タイヤ（比較例１）を１
００とする指数で示した。For these test tires, the weight of the belt cover layer and the tire weight were measured, and the high speed durability, riding comfort and road noise were evaluated by the following methods, and the results are shown in Table 1. Regarding the weight of the belt cover layer and the tire weight, the reference tire (Comparative Example 1) was 1
It is shown by an index of 00.
【００３５】高速耐久性：試験内圧２１０ｋＰａ、速度
８１ｋｍ／ｈの条件にて、ＪＡＴＭＡで規定された空気
圧条件に対応する荷重の８８％で１２０分間ならし走行
する。次いで３時間以上放冷した後、空気圧を再調整
し、１２１ｋｍ／ｈの速度から試験を開始し、３０分毎
に速度を８ｋｍ／ｈづつ段階的に上昇させ、故障が発生
するまで走行する。タイヤの故障が発生するまでの距離
を、基準タイヤ（比較例１）の故障距離を１００として
指数で表した値を高速耐久性とする。この指数値が大き
いほど高速耐久性が優れている。High-speed durability: Under the conditions of a test internal pressure of 210 kPa and a speed of 81 km / h, the tire is run for 120 minutes at 88% of the load corresponding to the air pressure condition specified by JATMA. Then, after cooling for 3 hours or more, the air pressure is readjusted, the test is started from the speed of 121 km / h, the speed is gradually increased by 8 km / h every 30 minutes, and the vehicle is run until a failure occurs. The value until the failure of the tire occurs is expressed as an index with the failure distance of the reference tire (Comparative Example 1) as 100, and the high-speed durability is defined. The higher the index value, the better the high speed durability.
【００３６】乗り心地：実車乗り心地評価（フィーリン
グ相対評価）を５名のドライバーにより行った。評価結
果は、基準タイヤ（比較例１）との相対比較にて、以下
の判定基準をもとに５点法で採点し、最高点と最低点を
除いた３名の平均点で表した。判定基準は、３が基準と
同等を意味し、３−が実用下限である。Ride comfort: The ride comfort of the actual vehicle (feeling relative evaluation) was evaluated by five drivers. The evaluation results were scored by a 5-point method based on the following criteria in relative comparison with a reference tire (Comparative Example 1), and expressed as an average score of 3 persons excluding the highest and lowest points. As for the criterion, 3 means the same as the criterion, and 3 is the practical lower limit.
【００３７】ロードノイズ：運転席窓側の耳位置にマイ
クロフォンを設置し、粗い路面のテストコースを速度６
０ｋｍ／ｈで定常走行した際の音圧を測定した。評価結
果は、測定値の逆数を用い、基準タイヤ（比較例１）を
１００とする指数で示した。この指数値が大きいほどロ
ードノイズが少ないことを意味する。Road noise: A microphone was installed at the ear position on the side of the driver's window, and a test course on a rough road surface was run at a speed of 6
The sound pressure during steady running at 0 km / h was measured. The evaluation results are shown by an index with the reference tire (Comparative Example 1) being 100, using the reciprocal of the measured value. A larger index value means less road noise.
【００３８】[0038]
【表１】 [Table 1]
【００３９】この表１から次のことが判る。ベルトカバ
ー層の総強力を合わせた比較例１と実施例１，２とを比
較すると、実施例１，２では高速耐久性と乗り心地を維
持しながら軽量化とロードノイズの低減が達成されてい
る。実施例３はベルトカバー層に実施例２よりも太い繊
維コードを使用することで最も好ましい結果が得られて
いる。実施例４はベルトカバー層の突き出し効果がない
ため実施例３よりは結果が劣っている。実施例５は剛性
がかなり高いため実施例３よりは結果が劣っている。更
に、ベルトカバー層の構成を種々異ならせた実施例６〜
１０においても目的に応じた改善効果が得られている。
一方、比較例２はベルトカバー層に用いたポリオレフィ
ンの繊維コードの強度が不十分であるため高速耐久性と
乗り心地の低下が顕著である。比較例３は２層のスチー
ルベルト層を使用しているためタイヤ重量が極めて大き
いものである。The following can be seen from Table 1. Comparing Comparative Example 1 and Examples 1 and 2 in which the total strength of the belt cover layers is combined, in Examples 1 and 2, reduction in weight and road noise while achieving high speed durability and riding comfort are achieved. There is. In Example 3, the most preferable result is obtained by using the fiber cord thicker than that in Example 2 in the belt cover layer. The result of Example 4 is inferior to that of Example 3 because the belt cover layer does not have a protruding effect. Since Example 5 has considerably high rigidity, the result is inferior to that of Example 3. Further, Examples 6 to 6 in which the structure of the belt cover layer was changed variously
Also in No. 10, the improvement effect according to the purpose was obtained.
On the other hand, in Comparative Example 2, since the strength of the polyolefin fiber cord used for the belt cover layer is insufficient, high-speed durability and reduction in riding comfort are remarkable. Comparative Example 3 uses two steel belt layers and therefore has a very large tire weight.
【００４０】[0040]
【発明の効果】以上説明したように本発明によれば、左
右一対のビード部間にカーカス層を装架し、トレッド部
における前記カーカス層の外周側に引張り強度２．０Ｇ
Ｐａ以上、弾性率７０ＧＰａ以上の有機繊維コードを用
いた少なくとも１層の有機繊維ベルト層を含む複数層の
ベルト層を埋設した空気入りラジアルタイヤにおいて、
ベルト層の外周側に、特定の条件を満足するポリオレフ
ィンケトンの繊維コードを用いたベルトカバー層を配置
したから、タイヤの重量増加を防ぎつつ、高速耐久性と
乗り心地とロードノイズとをバランス良く改善すること
ができる。As described above, according to the present invention, the carcass layer is mounted between the pair of left and right bead portions, and the tensile strength of 2.0 G is applied to the outer peripheral side of the carcass layer in the tread portion.
A pneumatic radial tire in which a plurality of belt layers including an organic fiber belt layer of at least one layer using an organic fiber cord having an elastic modulus of Pa or more and 70 GPa or more is embedded,
A belt cover layer made of a polyolefin ketone fiber cord that satisfies specific conditions is placed on the outer peripheral side of the belt layer, so that high speed durability, riding comfort and road noise are well balanced while preventing an increase in tire weight. Can be improved.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の実施形態からなる空気入りラジアルタ
イヤを示す半断面図である。FIG. 1 is a half sectional view showing a pneumatic radial tire according to an embodiment of the present invention.
１ トレッド部 ２ サイドウォール部 ３ ビード部 ４ カーカス層 ５ ビードコア ６ａ，６ｂ ベルト層 ７ ベルトカバー層 1 tread section 2 Side wall part 3 bead part 4 carcass layers 5 bead core 6a, 6b belt layer 7 Belt cover layer
Claims (3)
架し、トレッド部における前記カーカス層の外周側に引
張り強度２．０ＧＰａ以上、弾性率７０ＧＰａ以上の有
機繊維コードを用いた少なくとも１層の有機繊維ベルト
層を含む複数層のベルト層を埋設した空気入りラジアル
タイヤにおいて、前記ベルト層の外周側に、下記（１）
式で表される構造を有するポリオレフィンケトンのフィ
ラメントからなる繊維コードを用いたベルトカバー層を
配置し、該ベルトカバー層を構成する繊維コードの強度
が１０ｇ／Ｄ以上で、２．２５ｇ／Ｄ時の伸び率が３．
５％以下である空気入りラジアルタイヤ。 −（ＣＨ2 −ＣＨ2 −ＣＯ）ｎ−（Ｒ−ＣＯ）ｍ− ・・・（１） ここで、１．０５≧（ｎ＋ｍ）／ｎ≧１．００、 Ｒは炭素数が３以上のアルキレン基である。1. A carcass layer is mounted between a pair of left and right bead parts, and at least one layer using an organic fiber cord having a tensile strength of 2.0 GPa or more and an elastic modulus of 70 GPa or more on the outer peripheral side of the carcass layer in the tread part. In a pneumatic radial tire having a plurality of belt layers including the organic fiber belt layer embedded therein, the following (1) is provided on the outer peripheral side of the belt layer.
A belt cover layer using a fiber cord composed of a filament of a polyolefin ketone having a structure represented by the formula is arranged, and the strength of the fiber cord constituting the belt cover layer is 10 g / D or more and 2.25 g / D Has a growth rate of 3.
Pneumatic radial tire with 5% or less. - (CH 2 -CH 2 -CO) n- (R-CO) m- ··· (1) where, 1.05 ≧ (n + m) /n≧1.00, R is of 3 or more carbon atoms It is an alkylene group.
０Ｄ〜１５００Ｄのフィラメント束を１本以上撚り合わ
せたものである請求項１に記載の空気入りラジアルタイ
ヤ。2. The fiber cord of the belt cover layer is 50.
The pneumatic radial tire according to claim 1, wherein one or more filament bundles of 0D to 1500D are twisted together.
層の両端部から突き出すように配置した請求項１又は請
求項２に記載の空気入りラジアルタイヤ。3. The pneumatic radial tire according to claim 1, wherein the belt cover layer is arranged so as to protrude from at least both end portions of the belt layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001345853A JP4259790B2 (en) | 2001-11-12 | 2001-11-12 | Pneumatic radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001345853A JP4259790B2 (en) | 2001-11-12 | 2001-11-12 | Pneumatic radial tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003146010A true JP2003146010A (en) | 2003-05-21 |
| JP4259790B2 JP4259790B2 (en) | 2009-04-30 |
Family
ID=19159128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001345853A Expired - Fee Related JP4259790B2 (en) | 2001-11-12 | 2001-11-12 | Pneumatic radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4259790B2 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006224951A (en) * | 2005-01-24 | 2006-08-31 | Bridgestone Corp | Pneumatic radial-ply tire for aircraft |
| JP2006224948A (en) * | 2005-01-24 | 2006-08-31 | Bridgestone Corp | High performance pneumatic tire |
| JP2006224949A (en) * | 2005-01-21 | 2006-08-31 | Bridgestone Corp | Pneumatic radial tire for heavy load |
| JP2006264666A (en) * | 2005-02-28 | 2006-10-05 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
| JP2007196754A (en) * | 2006-01-24 | 2007-08-09 | Bridgestone Corp | Pneumatic tire |
| WO2007135864A1 (en) * | 2006-05-23 | 2007-11-29 | Bridgestone Corporation | Pneumatic tire |
| JP2007326436A (en) * | 2006-06-07 | 2007-12-20 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
| JP2007326439A (en) * | 2006-06-07 | 2007-12-20 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
| JP2009056938A (en) * | 2007-08-31 | 2009-03-19 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| WO2009041692A1 (en) * | 2007-09-27 | 2009-04-02 | Bridgestone Corporation | Pneumatic tire |
| JP2009096456A (en) * | 2007-09-27 | 2009-05-07 | Bridgestone Corp | Pneumatic tire |
| JP2015193385A (en) * | 2011-06-22 | 2015-11-05 | 株式会社ブリヂストン | Pneumatic radial tire for passenger car, use method of the tire, and tire rim assembly having the tire |
-
2001
- 2001-11-12 JP JP2001345853A patent/JP4259790B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006224949A (en) * | 2005-01-21 | 2006-08-31 | Bridgestone Corp | Pneumatic radial tire for heavy load |
| JP2006224951A (en) * | 2005-01-24 | 2006-08-31 | Bridgestone Corp | Pneumatic radial-ply tire for aircraft |
| JP2006224948A (en) * | 2005-01-24 | 2006-08-31 | Bridgestone Corp | High performance pneumatic tire |
| JP2006264666A (en) * | 2005-02-28 | 2006-10-05 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
| JP2007196754A (en) * | 2006-01-24 | 2007-08-09 | Bridgestone Corp | Pneumatic tire |
| JP2007313929A (en) * | 2006-05-23 | 2007-12-06 | Bridgestone Corp | Pneumatic tire |
| WO2007135864A1 (en) * | 2006-05-23 | 2007-11-29 | Bridgestone Corporation | Pneumatic tire |
| JP2007326436A (en) * | 2006-06-07 | 2007-12-20 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
| JP2007326439A (en) * | 2006-06-07 | 2007-12-20 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
| JP2009056938A (en) * | 2007-08-31 | 2009-03-19 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| WO2009041692A1 (en) * | 2007-09-27 | 2009-04-02 | Bridgestone Corporation | Pneumatic tire |
| JP2009096456A (en) * | 2007-09-27 | 2009-05-07 | Bridgestone Corp | Pneumatic tire |
| JP2015193385A (en) * | 2011-06-22 | 2015-11-05 | 株式会社ブリヂストン | Pneumatic radial tire for passenger car, use method of the tire, and tire rim assembly having the tire |
| US10226966B2 (en) | 2011-06-22 | 2019-03-12 | Bridgestone Corporation | Pneumatic radial tire for passenger vehicle, method for using the tire, and tire-rim assembly including the tire |
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|---|---|
| JP4259790B2 (en) | 2009-04-30 |
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