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WO2020129970A1 - Tire - Google Patents

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Publication number
WO2020129970A1
WO2020129970A1 PCT/JP2019/049375 JP2019049375W WO2020129970A1 WO 2020129970 A1 WO2020129970 A1 WO 2020129970A1 JP 2019049375 W JP2019049375 W JP 2019049375W WO 2020129970 A1 WO2020129970 A1 WO 2020129970A1
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WO
WIPO (PCT)
Prior art keywords
tire
belt
cord
spiral
reinforcing
Prior art date
Application number
PCT/JP2019/049375
Other languages
French (fr)
Japanese (ja)
Inventor
翔 福▲崎▼
俊雄 細田
Original Assignee
株式会社ブリヂストン
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Filing date
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Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2020129970A1 publication Critical patent/WO2020129970A1/en

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    • 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
    • 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

Definitions

  • the present invention relates to a tire, and particularly to a tire that can be suitably used for a high-performance four-wheeled vehicle.
  • a pneumatic tire for a four-wheeled vehicle such as a passenger car (hereinafter, abbreviated as a tire as appropriate), particularly a tire for a high-performance four-wheeled vehicle (including a racing vehicle), a tire having a pair of intersecting belt layers
  • a structure including a reinforcing belt (also referred to as a spiral belt) in which a reinforcing cord is wound along the tire circumferential direction is widely used on the outer side in the radial direction (see Patent Document 1).
  • the present invention has been made in view of such a situation, and an object thereof is to provide a tire in which the cornering force generated at a low slip angle is further enhanced while enhancing the high-speed durability.
  • One embodiment of the present invention is a tire (pneumatic tire 10) including at least a tread (tread 20) that comes into contact with a road surface, and a reinforcing belt (spiral belt 100) provided on the tire radial direction inner side of the tread,
  • the reinforcing belt has a reinforcing cord (spiral cord 111) wound so as to be substantially parallel to the tire circumferential direction, the tensile breaking strength of the reinforcing cord is 10 cN/dtex or more, The elongation at break is 13% or less.
  • FIG. 1 is a cross-sectional view of a pneumatic tire 10.
  • FIG. 2 is a top view (a tread surface view) showing a part of the carcass 40, the intersecting belt layer 50, and the spiral belt 100 of the pneumatic tire 10.
  • FIG. 3 is a partial perspective view of the spiral belt 100.
  • FIG. 1 is a sectional view of a pneumatic tire 10 according to the present embodiment. Specifically, FIG. 1 is a cross-sectional view of the pneumatic tire 10 taken along the tire width direction and the tire radial direction. Note that in FIG. 1, the cross-sectional hatching is partially omitted (the same applies hereinafter).
  • the tire equator line CL indicates the center of the pneumatic tire 10 in the tire width direction and the tire circumferential direction.
  • the pneumatic tire 10 includes a tread 20, a tire side portion 30, a carcass 40, a cross belt layer 50, a bead portion 60, and a spiral belt 100.
  • the pneumatic tire 10 is a pneumatic tire for four-wheeled vehicles such as passenger cars, and can be suitably used especially for high-performance four-wheeled vehicles (including racing vehicles).
  • Tread 20 is the part that contacts the road surface.
  • the tread 20 is formed with a pattern (not shown) according to the environment in which the pneumatic tire 10 is used and the type of vehicle to which the pneumatic tire 10 is mounted.
  • Tire side portion 30 is connected to the tread 20 and is located inside the tread 20 in the tire radial direction.
  • the tire side portion 30 is an area from the tire width direction outer end of the tread 20 to the upper end of the bead portion 60.
  • the tire side portion 30 is sometimes called a sidewall or the like.
  • the carcass 40 forms the skeleton of the pneumatic tire 10.
  • the carcass 40 has a radial structure in which carcass cords 41 (not shown in FIG. 1, see FIG. 2) radially arranged along the tire radial direction are covered with a rubber material.
  • the carcass 40 is not limited to the radial structure, and may have a bias structure in which the carcass cords 41 are arranged so as to intersect in the tire radial direction.
  • the interlaced belt layer 50 is provided inside the tread 20 in the tire radial direction.
  • the cross belt layer 50 is provided between the carcass 40 and the spiral belt 100.
  • the cross belt layer 50 is composed of a pair of cross belts, specifically, a cross belt 51 and a cross belt 52. That is, the intersecting belt layer 50 is provided inside the spiral belt 100 in the tire radial direction.
  • the cross belt 51 is in contact with the carcass 40 and is provided outside the carcass 40 in the tire radial direction.
  • the cross belt 52 contacts the cross belt 51 and is provided outside the cross belt 51 in the radial direction of the tire.
  • the bead portion 60 is connected to the tire side portion 30 and is located inside the tire side portion 30 in the tire radial direction.
  • the bead portion 60 has an annular shape, and the carcass 40 is folded back from the tire width direction inner side to the tire width direction outer side via the bead portion 60.
  • the spiral belt 100 is provided inside the tread 20 in the tire radial direction.
  • the spiral belt 100 constitutes a reinforcing belt.
  • the spiral belt 100 is provided in an area of 80% or more of the total width TW of the tread in the tire width direction. If possible, the spiral belt 100 may be provided in an area of 100% or more of the total width TW.
  • Width TW is based on the condition that the pneumatic tire 10 is assembled to an appropriate rim wheel, the pneumatic tire 10 is set to the regular internal pressure, and the pneumatic tire 10 is loaded with the regular load.
  • the regular internal pressure is the air pressure that corresponds to the maximum load capacity of the JATMA (Japan Automobile Tire Manufacturers Association) YearBook in Japan
  • the regular load is the maximum load capacity (maximum load) that corresponds to the maximum load capacity of the JATMA YearBook. ..
  • ETRTO in Europe, TRA in the US, and tire standards of other countries correspond.
  • FIG. 2 is a top view (a tread surface view) showing a part of the carcass 40, the intersecting belt layer 50, and the spiral belt 100 of the pneumatic tire 10.
  • the carcass 40 has a radial structure and has carcass cords 41 radially provided along the tire radial direction.
  • the carcass cord 41 can be formed by using an organic fiber such as nylon, like a tire for a general high-performance four-wheeled vehicle.
  • the cross belt 51 that forms the cross belt layer 50 is provided outside the carcass 40 in the tire radial direction.
  • the cross belt 51 has a belt cord 51a that is inclined with respect to the tire width direction.
  • the cross belt 52 that forms the cross belt layer 50 is provided outside the cross belt 51 in the tire radial direction.
  • the cross belt 52 also has a belt cord 52a inclined with respect to the tire width direction.
  • the belt cord 52a is inclined in the direction opposite to the belt cord 51a with the tire width direction as a reference (or the tire equator line CL may be used as a reference).
  • the angle ⁇ 1 formed by the belt cord 51a and the tire width direction is approximately 40 degrees.
  • the belt cord 52a is inclined in the opposite direction to the belt cord 51a, but the angle ⁇ 2 formed by the belt cord 52a and the tire width direction is also approximately 40 degrees.
  • Belt belt 51a and belt cord 52a are made of organic fiber or steel.
  • organic fibers for example, polyester or Kevlar can be used.
  • the spiral belt 100 has a spiral cord 111 wound so as to be substantially parallel to the tire circumferential direction.
  • the angle formed by the spiral cord 111 with the tire circumferential direction (tire equator line CL) is preferably ⁇ 10 degrees or less, and more preferably ⁇ 5 degrees or less.
  • the spiral cord 111 is made of organic fiber or steel.
  • the material of the spiral cord 111 and the material of the belt cord 51a and the belt cord 52a may be the same, but in consideration of the performance required for the pneumatic tire 10, it is preferable that they are different.
  • the spiral cord 111 preferably has higher strength than the belt cords 51a and 52a.
  • Kevlar can be used, for example.
  • the tensile breaking strength of the spiral cord 111 is preferably 10 cN/dtex or more.
  • the elongation at break of the spiral cord 111 is preferably 13% or less.
  • the tensile strength at break and elongation at break mean the values measured by the corresponding JIS measurement method.
  • the arrangement interval (may be referred to as arrangement density) of the spiral cords 111 in the tire width direction is 10 or more/cm.
  • FIG. 3 is a partial perspective view of the spiral belt 100.
  • the spiral belt 100 is composed of a plurality of cord units 110.
  • the spiral belt 100 is configured by winding a cord unit 110, in which a plurality of spiral cords 111 are arranged along the tire width direction, around the tire circumferential direction.
  • the cord unit 110 has two spiral cords 111 provided at intervals in the tire width direction.
  • Such a cord unit 110 may be called a double-strand winding (the number of spiral cords 111 included in the cord unit 110).
  • the size of the cord unit 110 in the tire width direction is preferably 4% or less of the total width TW of the tread 20 (see FIG. 1). It should be noted that the lower limit of the unit width W is not particularly limited, but considering the ease of manufacturing the cord unit 110 and the like, it is considered that the unit width W is actually 0.3% or more of the total width TW.
  • the spiral belt 100 configured by such a cord unit 110 may be called a mono spiral belt (MSB).
  • the spiral belt 100 is configured by winding a cord unit 110 having two spiral cords 111 a plurality of times in the tire circumferential direction.
  • the cord unit 110 is wound multiple times in the tire circumferential direction from one end in the tire width direction to the other end.
  • the spiral cord 111 is preferably twisted, although it depends on the material (organic fiber or steel). In the case of organic fibers (Kevlar), it is preferable that the fibers are twisted at about 4 to 5 times/cm.
  • the cross-sectional area of the cord unit 110 specifically, the product of the unit width W and the unit height H, the number of spiral cords 111 to be driven is preferably 2 /mm 2 or less.
  • the spiral belt 100 has a spiral cord 111 wound so as to be substantially parallel to the tire circumferential direction.
  • the tensile breaking strength of the spiral cord 111 is 10 cN/dtex or more.
  • the elongation at break of the spiral cord 111 is 13% or less.
  • the spiral belt 100 having the highly elastic spiral cord 111 effectively suppresses the pantograph deformation of the cross belt layer 50. Further, the spiral belt 100 effectively suppresses the deformation of the intersecting belt layer 50 in the tire circumferential direction and the specific deformation of the shoulder portion of the tread 20 when the lateral force is input to the pneumatic tire 10. That is, the shear rigidity inside the intersecting belt layer 50 is improved.
  • the tensile breaking strength of the spiral cord 111 is high and the elongation at break is low, the strain amount due to repeated compression and tension of the spiral belt 100 during high-speed rolling of the pneumatic tire 10 can be effectively suppressed. ..
  • the cornering force generated at a low slip angle can be further increased while improving the high-speed durability.
  • the spiral cord 111 is made of organic fiber such as Kevlar or steel.
  • the arrangement interval of the spiral cords 111 in the tire width direction is 10 cords/cm or more.
  • the spiral belt 100 is provided in an area of 80% or more of the total width TW of the tread 20 in the tire width direction.
  • the belt cord 51a and the belt cord 52a are made of organic fiber or steel. Therefore, pantograph deformation of the intersecting belt layer 50 can be further suppressed. Thereby, the high-speed durability of the pneumatic tire 10 and the cornering force at a low slip angle can be further enhanced.
  • the spiral belt 100 is configured by winding a cord unit 110, in which a plurality of spiral cords 111 are arranged along the tire width direction, around the tire circumferential direction. Therefore, since the cord unit 110 can be wound around the tire circumferential direction, the manufacturing of the spiral belt 100 becomes easy (time is shortened), and the strength required for the spiral belt 100 is easily secured.
  • the size of the cord unit 110 in the tire width direction is 4% or less of the total width TW of the tread 20. Therefore, the cord unit 110 follows the shape of the tread 20 whose cross-sectional shape is rounded in a crown shape. Thereby, the same performance can be exhibited regardless of the part of the tread 20. That is, the high-speed durability of the pneumatic tire 10 and the cornering force at a low slip angle can be further enhanced.
  • the cord unit 110 has two windings (two spiral cords 111), but the number of spiral cords 111 included in the cord unit 110 may be slightly increased.
  • the spiral belt 100 may be configured by winding one rubber-coated spiral cord 111 along the tire circumferential direction without using the cord unit 110.
  • spiral belt 100 and the spiral cord 111 may be called a circumferential belt and a circumferential cord.
  • the pneumatic tire 10 is a pneumatic tire for four-wheeled vehicles such as passenger cars, and is described as being particularly suitable for high-performance four-wheeled vehicles (including racing vehicles).
  • the pneumatic tire 10 may be used for general passenger cars and is not limited to four-wheeled cars, but may be widely used for vehicles that corner by utilizing slip angles.

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

Abstract

A pneumatic tire (10) is provided with a spiral belt (100). The spiral belt (100) includes a spiral cord (111) which is wound substantially in parallel to the tire circumferential direction. The spiral cord (111) has a tensile breaking strength of not less than 10 cN/dtex and an elongation at break of not more than 13%.

Description

タイヤtire
　本発明は、タイヤに関し、特に、高性能四輪自動車に好適に用い得るタイヤに関する。 The present invention relates to a tire, and particularly to a tire that can be suitably used for a high-performance four-wheeled vehicle.
　従来、乗用自動車などの四輪自動車向けの空気入りタイヤ（以下、タイヤと適宜省略する）、特に、高性能四輪自動車（レース用車両を含む）向けのタイヤでは、一対の交錯ベルト層のタイヤ径方向外側に、タイヤ周方向に沿って補強コードが巻き回された補強ベルト（スパイラルベルトとも呼ぶ）を備える構造が広く用いられている（特許文献１参照）。 Conventionally, a pneumatic tire for a four-wheeled vehicle such as a passenger car (hereinafter, abbreviated as a tire as appropriate), particularly a tire for a high-performance four-wheeled vehicle (including a racing vehicle), a tire having a pair of intersecting belt layers A structure including a reinforcing belt (also referred to as a spiral belt) in which a reinforcing cord is wound along the tire circumferential direction is widely used on the outer side in the radial direction (see Patent Document 1).
　これにより、特に高速走行時にタイヤが径方向に拡張する径成長が効果的に抑制され、高速耐久性を高め得る。 Due to this, the diameter growth of the tire that expands in the radial direction can be effectively suppressed, especially at high speeds, and high-speed durability can be improved.
特開2006-240471号公報JP 2006-240471 A
　上述したタイヤによれば、高速走行時におけるタイヤの径成長を抑制し得る。一方、特に、高性能四輪自動車の場合、このようなタイヤにおいて、低スリップ角（SA）におけるコーナリングフォース（CF）をさらに向上させたい要求がある。 According to the above-mentioned tire, it is possible to suppress the diameter growth of the tire during high speed running. On the other hand, particularly in the case of a high-performance four-wheeled vehicle, there is a demand for further improving the cornering force (CF) at a low slip angle (SA) in such a tire.
　これにより、特に、操舵角が与えられない後輪のコーナリングフォースを効果的に高めることができ、レースコースのラップタイム向上などに貢献し得る。 By doing this, you can effectively increase the cornering force of the rear wheels that are not given a steering angle, which can contribute to improving the lap time of the race course.
　そこで、本発明は、このような状況に鑑みてなされたものであり、高速耐久性を高めつつ、低スリップ角において発生するコーナリングフォースをさらに高めたタイヤの提供を目的とする。 Therefore, the present invention has been made in view of such a situation, and an object thereof is to provide a tire in which the cornering force generated at a low slip angle is further enhanced while enhancing the high-speed durability.
　本発明の一態様は、路面に接するトレッド（トレッド20）と、前記トレッドのタイヤ径方向内側に設けられる補強ベルト（スパイラルベルト100）とを少なくとも備えたタイヤ（空気入りタイヤ10）であって、前記補強ベルトは、タイヤ周方向と略平行になるように巻き回された補強コード（スパイラルコード111）を有し、前記補強コードの引張破断強度は、10cN/dtex以上であり、前記補強コードの破断時伸びは、13%以下である。 One embodiment of the present invention is a tire (pneumatic tire 10) including at least a tread (tread 20) that comes into contact with a road surface, and a reinforcing belt (spiral belt 100) provided on the tire radial direction inner side of the tread, The reinforcing belt has a reinforcing cord (spiral cord 111) wound so as to be substantially parallel to the tire circumferential direction, the tensile breaking strength of the reinforcing cord is 10 cN/dtex or more, The elongation at break is 13% or less.
図１は、空気入りタイヤ10の断面図である。FIG. 1 is a cross-sectional view of a pneumatic tire 10. 図２は、空気入りタイヤ10のカーカス40、交錯ベルト層50及びスパイラルベルト100の一部を示す上面図（トレッド面視）である。FIG. 2 is a top view (a tread surface view) showing a part of the carcass 40, the intersecting belt layer 50, and the spiral belt 100 of the pneumatic tire 10. 図３は、スパイラルベルト100の一部単体斜視図である。FIG. 3 is a partial perspective view of the spiral belt 100.
　以下、実施形態を図面に基づいて説明する。なお、同一の機能や構成には、同一または類似の符号を付して、その説明を適宜省略する。 Embodiments will be described below with reference to the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.
　（１）タイヤの全体概略構成
　図１は、本実施形態に係る空気入りタイヤ10の断面図である。具体的には、図１は、空気入りタイヤ10のタイヤ幅方向及びタイヤ径方向に沿った断面図である。なお、図１では、断面ハッチングの図示が一部省略されている（以下同）。タイヤ赤道線CLは、タイヤ幅方向及びタイヤ周方向における空気入りタイヤ10の中心を示す。 (1) Overall Schematic Configuration of Tire FIG. 1 is a sectional view of a pneumatic tire 10 according to the present embodiment. Specifically, FIG. 1 is a cross-sectional view of the pneumatic tire 10 taken along the tire width direction and the tire radial direction. Note that in FIG. 1, the cross-sectional hatching is partially omitted (the same applies hereinafter). The tire equator line CL indicates the center of the pneumatic tire 10 in the tire width direction and the tire circumferential direction.
　図１に示すように、空気入りタイヤ10は、トレッド20、タイヤサイド部30、カーカス40、交錯ベルト層50、ビード部60及びスパイラルベルト100を備える。 As shown in FIG. 1, the pneumatic tire 10 includes a tread 20, a tire side portion 30, a carcass 40, a cross belt layer 50, a bead portion 60, and a spiral belt 100.
　空気入りタイヤ10は、乗用自動車などの四輪自動車向けの空気入りタイヤであり、特に、高性能四輪自動車（レース用車両を含む）に好適に用い得る。 The pneumatic tire 10 is a pneumatic tire for four-wheeled vehicles such as passenger cars, and can be suitably used especially for high-performance four-wheeled vehicles (including racing vehicles).
　トレッド20は、路面と接する部分である。トレッド20には、空気入りタイヤ10の使用環境や装着される車両の種別に応じたパターン（不図示）が形成される。 　Tread 20 is the part that contacts the road surface. The tread 20 is formed with a pattern (not shown) according to the environment in which the pneumatic tire 10 is used and the type of vehicle to which the pneumatic tire 10 is mounted.
　タイヤサイド部30は、トレッド20に連なり、トレッド20のタイヤ径方向内側に位置する。タイヤサイド部30は、トレッド20のタイヤ幅方向外側端からビード部60の上端までの領域である。タイヤサイド部30は、サイドウォールなどと呼ばれることもある。 Tire side portion 30 is connected to the tread 20 and is located inside the tread 20 in the tire radial direction. The tire side portion 30 is an area from the tire width direction outer end of the tread 20 to the upper end of the bead portion 60. The tire side portion 30 is sometimes called a sidewall or the like.
　カーカス40は、空気入りタイヤ10の骨格を形成する。カーカス40は、タイヤ径方向に沿って放射状に配置されたカーカスコード41（図１において不図示、図２参照）がゴム材料によって被覆されたラジアル構造である。但し、カーカス40は、ラジアル構造に限定されず、カーカスコード41がタイヤ径方向に交錯するように配置されたバイアス構造でも構わない。 The carcass 40 forms the skeleton of the pneumatic tire 10. The carcass 40 has a radial structure in which carcass cords 41 (not shown in FIG. 1, see FIG. 2) radially arranged along the tire radial direction are covered with a rubber material. However, the carcass 40 is not limited to the radial structure, and may have a bias structure in which the carcass cords 41 are arranged so as to intersect in the tire radial direction.
　交錯ベルト層50は、トレッド20のタイヤ径方向内側に設けられる。交錯ベルト層50は、カーカス40とスパイラルベルト100との間に設けられる。 The interlaced belt layer 50 is provided inside the tread 20 in the tire radial direction. The cross belt layer 50 is provided between the carcass 40 and the spiral belt 100.
　交錯ベルト層50は、一対の交錯ベルト、具体的には、交錯ベルト51と交錯ベルト52とによって構成される。つまり、スパイラルベルト100のタイヤ径方向内側には、交錯ベルト層50が設けられる。 The cross belt layer 50 is composed of a pair of cross belts, specifically, a cross belt 51 and a cross belt 52. That is, the intersecting belt layer 50 is provided inside the spiral belt 100 in the tire radial direction.
　交錯ベルト51は、カーカス40と接し、カーカス40のタイヤ径方向外側に設けられる。交錯ベルト52は、交錯ベルト51と接し、交錯ベルト51のタイヤ径方向外側に設けられる。 The cross belt 51 is in contact with the carcass 40 and is provided outside the carcass 40 in the tire radial direction. The cross belt 52 contacts the cross belt 51 and is provided outside the cross belt 51 in the radial direction of the tire.
　ビード部60は、タイヤサイド部30に連なり、タイヤサイド部30のタイヤ径方向内側に位置する。ビード部60は、円環状であり、ビード部60を介してカーカス40がタイヤ幅方向内側からタイヤ幅方向外側に折り返されている。 The bead portion 60 is connected to the tire side portion 30 and is located inside the tire side portion 30 in the tire radial direction. The bead portion 60 has an annular shape, and the carcass 40 is folded back from the tire width direction inner side to the tire width direction outer side via the bead portion 60.
　スパイラルベルト100は、トレッド20のタイヤ径方向内側に設けられる。本実施形態において、スパイラルベルト100は、補強ベルトを構成する。 The spiral belt 100 is provided inside the tread 20 in the tire radial direction. In the present embodiment, the spiral belt 100 constitutes a reinforcing belt.
　スパイラルベルト100は、タイヤ幅方向において、トレッドの全幅TWの80%以上の領域に設けられる。なお、スパイラルベルト100は、可能ならば、全幅TWの100%以上の領域に設けられてもよい。 The spiral belt 100 is provided in an area of 80% or more of the total width TW of the tread in the tire width direction. If possible, the spiral belt 100 may be provided in an area of 100% or more of the total width TW.
　全幅TWは、空気入りタイヤ10を適正なリムホイールに組み付け、空気入りタイヤ10を正規内圧に設定し、空気入りタイヤ10に正規荷重を負荷した状態を基準とする。 Width TW is based on the condition that the pneumatic tire 10 is assembled to an appropriate rim wheel, the pneumatic tire 10 is set to the regular internal pressure, and the pneumatic tire 10 is loaded with the regular load.
　正規内圧とは、日本ではJATMA（日本自動車タイヤ協会）のYearBookにおける最大負荷能力に対応する空気圧であり、正規荷重とは、JATMA YearBookにおける最大負荷能力に対応する最大負荷能力（最大荷重）である。また欧州ではETRTO、米国ではTRA、その他各国のタイヤ規格が対応する。 The regular internal pressure is the air pressure that corresponds to the maximum load capacity of the JATMA (Japan Automobile Tire Manufacturers Association) YearBook in Japan, and the regular load is the maximum load capacity (maximum load) that corresponds to the maximum load capacity of the JATMA YearBook. .. In addition, ETRTO in Europe, TRA in the US, and tire standards of other countries correspond.
　（２）タイヤの内部構成
　次に、空気入りタイヤ10の内部構成について、さらに説明する。図２は、空気入りタイヤ10のカーカス40、交錯ベルト層50及びスパイラルベルト100の一部を示す上面図（トレッド面視）である。 (2) Internal Structure of Tire Next, the internal structure of the pneumatic tire 10 will be further described. FIG. 2 is a top view (a tread surface view) showing a part of the carcass 40, the intersecting belt layer 50, and the spiral belt 100 of the pneumatic tire 10.
　図２に示すように、カーカス40は、ラジアル構造であり、タイヤ径方向に沿って放射状に設けられたカーカスコード41を有する。カーカスコード41は、一般的な高性能四輪自動車向けのタイヤと同様に、ナイロンなどの有機繊維を用いて形成できる。 As shown in FIG. 2, the carcass 40 has a radial structure and has carcass cords 41 radially provided along the tire radial direction. The carcass cord 41 can be formed by using an organic fiber such as nylon, like a tire for a general high-performance four-wheeled vehicle.
　交錯ベルト層50を構成する交錯ベルト51は、カーカス40のタイヤ径方向外側に設けられる。交錯ベルト51は、タイヤ幅方向に対して傾斜したベルトコード51aを有する。 The cross belt 51 that forms the cross belt layer 50 is provided outside the carcass 40 in the tire radial direction. The cross belt 51 has a belt cord 51a that is inclined with respect to the tire width direction.
　また、交錯ベルト層50を構成する交錯ベルト52は、交錯ベルト51のタイヤ径方向外側に設けられる。交錯ベルト52もタイヤ幅方向に対して傾斜したベルトコード52aを有する。 The cross belt 52 that forms the cross belt layer 50 is provided outside the cross belt 51 in the tire radial direction. The cross belt 52 also has a belt cord 52a inclined with respect to the tire width direction.
　ベルトコード52aは、タイヤ幅方向を基準（或いはタイヤ赤道線CLを基準としてもよい）として、ベルトコード51aと逆方向に傾斜している。 The belt cord 52a is inclined in the direction opposite to the belt cord 51a with the tire width direction as a reference (or the tire equator line CL may be used as a reference).
　本実施形態では、ベルトコード51aとタイヤ幅方向とが成す角度θ1は、概ね40度である。ベルトコード52aは、ベルトコード51aと逆方向に傾斜しているが、ベルトコード52aとタイヤ幅方向とが成す角度θ2も、概ね40度である。 In this embodiment, the angle θ1 formed by the belt cord 51a and the tire width direction is approximately 40 degrees. The belt cord 52a is inclined in the opposite direction to the belt cord 51a, but the angle θ2 formed by the belt cord 52a and the tire width direction is also approximately 40 degrees.
　ベルトコード51a及びベルトコード52aは、有機繊維またはスチールによって形成される。有機繊維の場合、例えば、ポリエステルまたはケブラーを用いることができる。 Belt belt 51a and belt cord 52a are made of organic fiber or steel. In the case of organic fibers, for example, polyester or Kevlar can be used.
　スパイラルベルト100は、タイヤ周方向と略平行になるように巻き回されたスパイラルコード111を有する。スパイラルコード111がタイヤ周方向（タイヤ赤道線CL）と成す角度が±10度以下であることが好ましく、±5度以下であることがより好ましい。 The spiral belt 100 has a spiral cord 111 wound so as to be substantially parallel to the tire circumferential direction. The angle formed by the spiral cord 111 with the tire circumferential direction (tire equator line CL) is preferably ±10 degrees or less, and more preferably ±5 degrees or less.
　スパイラルコード111は、有機繊維またはスチールによって形成される。なお、スパイラルコード111の材質と、ベルトコード51a及びベルトコード52aの材質は、同一でもよいが、空気入りタイヤ10に要求される性能を考慮すると、異なっていることが好ましい。具体的には、スパイラルコード111は、ベルトコード51a及びベルトコード52aよりも強度が高いことが好ましい。有機繊維の場合、例えば、ケブラーを用いることができる。 The spiral cord 111 is made of organic fiber or steel. The material of the spiral cord 111 and the material of the belt cord 51a and the belt cord 52a may be the same, but in consideration of the performance required for the pneumatic tire 10, it is preferable that they are different. Specifically, the spiral cord 111 preferably has higher strength than the belt cords 51a and 52a. In the case of organic fibers, Kevlar can be used, for example.
　本実施形態では、スパイラルコード111の引張破断強度は、10cN/dtex以上であることが好ましい。また、スパイラルコード111の破断時伸びは、13%以下であることが好ましい。
なお、引張破断強度及び破断時伸びは、該当するJIS測定法によって測定された値を意味する。 In this embodiment, the tensile breaking strength of the spiral cord 111 is preferably 10 cN/dtex or more. The elongation at break of the spiral cord 111 is preferably 13% or less.
The tensile strength at break and elongation at break mean the values measured by the corresponding JIS measurement method.
　さらに、本実施形態では、タイヤ幅方向におけるスパイラルコード111の配置間隔（配置密度と呼んでもよい）は、10本／cm以上である。 Further, in the present embodiment, the arrangement interval (may be referred to as arrangement density) of the spiral cords 111 in the tire width direction is 10 or more/cm.
　（３）補強ベルトの構成
　次に、スパイラルベルト100の構成について、さらに説明する。図３は、スパイラルベルト100の一部単体斜視図である。 (3) Configuration of Reinforcing Belt Next, the configuration of the spiral belt 100 will be further described. FIG. 3 is a partial perspective view of the spiral belt 100.
　図３に示すように、スパイラルベルト100は、複数のコードユニット110によって構成される。具体的には、スパイラルベルト100は、複数のスパイラルコード111がタイヤ幅方向に沿って配置されたコードユニット110がタイヤ周方向に沿って巻き回されることによって構成される。 As shown in FIG. 3, the spiral belt 100 is composed of a plurality of cord units 110. Specifically, the spiral belt 100 is configured by winding a cord unit 110, in which a plurality of spiral cords 111 are arranged along the tire width direction, around the tire circumferential direction.
　本実施形態では、コードユニット110は、タイヤ幅方向において間隔を空けて設けられた2条のスパイラルコード111を有する。このようなコードユニット110は、2条巻き（コードユニット110に含まれるスパイラルコード111の本数）と呼んでもよい。 In the present embodiment, the cord unit 110 has two spiral cords 111 provided at intervals in the tire width direction. Such a cord unit 110 may be called a double-strand winding (the number of spiral cords 111 included in the cord unit 110).
　コードユニット110のタイヤ幅方向におけるサイズ、具体的には、ユニット幅Wは、トレッド20の全幅TW（図１参照）の4%以下であることが好ましい。なお、ユニット幅Wの下限は、特に限定されないが、コードユニット110の製造容易性などを考慮すると、現実的には、ユニット幅Wは、全幅TWの0.3％以上となると考えられる。 The size of the cord unit 110 in the tire width direction, specifically, the unit width W is preferably 4% or less of the total width TW of the tread 20 (see FIG. 1). It should be noted that the lower limit of the unit width W is not particularly limited, but considering the ease of manufacturing the cord unit 110 and the like, it is considered that the unit width W is actually 0.3% or more of the total width TW.
　また、このようなコードユニット110によって構成されるスパイラルベルト100は、モノスパイラルベルト（MSB）と呼ばれてもよい。スパイラルベルト100は、2条のスパイラルコード111を有するコードユニット110がタイヤ周方向において複数回巻き回されることによって構成される。 Also, the spiral belt 100 configured by such a cord unit 110 may be called a mono spiral belt (MSB). The spiral belt 100 is configured by winding a cord unit 110 having two spiral cords 111 a plurality of times in the tire circumferential direction.
　つまり、コードユニット110は、タイヤ幅方向における一方の端部から他方の端部に向けてタイヤ周方向に複数回巻き回される。 That is, the cord unit 110 is wound multiple times in the tire circumferential direction from one end in the tire width direction to the other end.
　スパイラルコード111は、材質（有機繊維またはスチール）にもよるが、撚られていることが好ましい。有機繊維（ケブラー）であれば、4～5回／cm程度で撚られることが好ましい。 The spiral cord 111 is preferably twisted, although it depends on the material (organic fiber or steel). In the case of organic fibers (Kevlar), it is preferable that the fibers are twisted at about 4 to 5 times/cm.
　また、コードユニット110の断面積、具体的には、ユニット幅Wとユニット高さHとの積にたいするスパイラルコード111の打込み本数は、2本／mm2以下であることが好ましい。 In addition, the cross-sectional area of the cord unit 110, specifically, the product of the unit width W and the unit height H, the number of spiral cords 111 to be driven is preferably 2 /mm 2 or less.
　（４）作用・効果
　上述した実施形態によれば、以下の作用効果が得られる。空気入りタイヤ10では、スパイラルベルト100は、タイヤ周方向と略平行になるように巻き回されたスパイラルコード111を有する。また、スパイラルコード111の引張破断強度は、10cN/dtex以上である。さらに、スパイラルコード111の破断時伸びは、13%以下である。 (4) Operation/Effect According to the above-described embodiment, the following operation/effect can be obtained. In the pneumatic tire 10, the spiral belt 100 has a spiral cord 111 wound so as to be substantially parallel to the tire circumferential direction. The tensile breaking strength of the spiral cord 111 is 10 cN/dtex or more. Furthermore, the elongation at break of the spiral cord 111 is 13% or less.
　このように高弾性のスパイラルコード111を有するスパイラルベルト100は、交錯ベルト層50のパンタグラフ変形を効果的に抑制する。さらに、スパイラルベルト100は、空気入りタイヤ10への横力入力時において、交錯ベルト層50のタイヤ周方向における変形、具体的なトレッド20のショルダー部の変形も効果的に抑制する。つまり、交錯ベルト層50内部におけるせん断剛性が向上する。 The spiral belt 100 having the highly elastic spiral cord 111 effectively suppresses the pantograph deformation of the cross belt layer 50. Further, the spiral belt 100 effectively suppresses the deformation of the intersecting belt layer 50 in the tire circumferential direction and the specific deformation of the shoulder portion of the tread 20 when the lateral force is input to the pneumatic tire 10. That is, the shear rigidity inside the intersecting belt layer 50 is improved.
　これにより、低スリップ角（SA）時、具体的には、SAが2度以下の領域において、従来の同様のタイヤと比較して大きなコーナリングフォース（CF）を発生させることができ、空気入りタイヤ10が装着された車両の旋回性能が大幅に向上する。特に、操舵角が与えられない後輪のコーナリングフォースを効果的に高めることができる。 As a result, at low slip angle (SA), specifically, in a region where SA is 2 degrees or less, a large cornering force (CF) can be generated as compared with a similar tire in the related art, and the pneumatic tire The turning performance of a vehicle equipped with 10 is significantly improved. In particular, it is possible to effectively increase the cornering force of the rear wheels to which no steering angle is given.
　さらに、スパイラルコード111の引張破断強度が高く、破断時伸びが低いため、特に、空気入りタイヤ10の高速転動時におけるスパイラルベルト100の圧縮及び引っ張りの繰り返しによる歪量を効果的に抑制し得る。 Furthermore, since the tensile breaking strength of the spiral cord 111 is high and the elongation at break is low, the strain amount due to repeated compression and tension of the spiral belt 100 during high-speed rolling of the pneumatic tire 10 can be effectively suppressed. ..
　これにより、スパイラルベルト100及びスパイラルベルト100周辺のゴムの発熱に起因する故障を防止し得る。 This can prevent failures due to heat generation of the spiral belt 100 and the rubber around the spiral belt 100.
　すなわち、空気入りタイヤ10によれば、高速耐久性を高めつつ、低スリップ角において発生するコーナリングフォースをさらに高め得る。 That is, according to the pneumatic tire 10, the cornering force generated at a low slip angle can be further increased while improving the high-speed durability.
　本実施形態では、スパイラルコード111は、ケブラーなどの有機繊維またはスチールによって形成される。また、タイヤ幅方向におけるスパイラルコード111の配置間隔は、10本／cm以上である。さらに、スパイラルベルト100は、タイヤ幅方向において、トレッド20の全幅TWの80%以上の領域に設けられる。 In the present embodiment, the spiral cord 111 is made of organic fiber such as Kevlar or steel. The arrangement interval of the spiral cords 111 in the tire width direction is 10 cords/cm or more. Further, the spiral belt 100 is provided in an area of 80% or more of the total width TW of the tread 20 in the tire width direction.
　このため、スパイラルコード111の引張破断強度の向上と、破断時伸びの抑制とを高い次元で両立し得る。これにより、空気入りタイヤ10の高速耐久性及び低スリップ角におけるコーナリングフォースをさらに高め得る。 Therefore, it is possible to improve the tensile breaking strength of the spiral cord 111 and suppress the elongation at break at a high level. Thereby, the high-speed durability of the pneumatic tire 10 and the cornering force at a low slip angle can be further enhanced.
　また、本実施形態では、ベルトコード51a及びベルトコード52aは、有機繊維またはスチールによって形成される。このため、交錯ベルト層50のパンタグラフ変形をさらに抑制し得る。これにより、空気入りタイヤ10の高速耐久性及び低スリップ角におけるコーナリングフォースをさらに高め得る。 Further, in the present embodiment, the belt cord 51a and the belt cord 52a are made of organic fiber or steel. Therefore, pantograph deformation of the intersecting belt layer 50 can be further suppressed. Thereby, the high-speed durability of the pneumatic tire 10 and the cornering force at a low slip angle can be further enhanced.
　本実施形態では、スパイラルベルト100は、複数のスパイラルコード111がタイヤ幅方向に沿って配置されたコードユニット110がタイヤ周方向に沿って巻き回されることによって構成される。このため、コードユニット110をタイヤ周方向に沿って巻き回すことができるため、スパイラルベルト100の製造が容易（時間短縮）となるとともに、スパイラルベルト100としての必要な強度を確保し易い。 In the present embodiment, the spiral belt 100 is configured by winding a cord unit 110, in which a plurality of spiral cords 111 are arranged along the tire width direction, around the tire circumferential direction. Therefore, since the cord unit 110 can be wound around the tire circumferential direction, the manufacturing of the spiral belt 100 becomes easy (time is shortened), and the strength required for the spiral belt 100 is easily secured.
　また、本実施形態では、コードユニット110のタイヤ幅方向におけるサイズは、トレッド20の全幅TWの4%以下である。このため、断面形状がクラウン状にラウンドしているトレッド20の形状に、コードユニット110がよく追従する。これにより、トレッド20の部位に依らず同様の性能を発揮し得る。つまり、空気入りタイヤ10の高速耐久性及び低スリップ角におけるコーナリングフォースをさらに高め得る。 Also, in the present embodiment, the size of the cord unit 110 in the tire width direction is 4% or less of the total width TW of the tread 20. Therefore, the cord unit 110 follows the shape of the tread 20 whose cross-sectional shape is rounded in a crown shape. Thereby, the same performance can be exhibited regardless of the part of the tread 20. That is, the high-speed durability of the pneumatic tire 10 and the cornering force at a low slip angle can be further enhanced.
　（５）その他の実施形態
　以上、実施例に沿って本発明の内容を説明したが、本発明はこれらの記載に限定されるものではなく、種々の変形及び改良が可能であることは、当業者には自明である。 (5) Other Embodiments The content of the present invention has been described above with reference to the examples, but the present invention is not limited to these descriptions, and various modifications and improvements are possible. It is obvious to the trader.
　例えば、上述した実施形態では、コードユニット110は、2条巻き（2本のスパイラルコード111）であったが、コードユニット110に含まれるスパイラルコード111の本数は、多少増やしても構わない。 For example, in the above-described embodiment, the cord unit 110 has two windings (two spiral cords 111), but the number of spiral cords 111 included in the cord unit 110 may be slightly increased.
　或いは、コードユニット110を用いずに、ゴム被覆された1本のスパイラルコード111をタイヤ周方向に沿って巻き回してスパイラルベルト100を構成してもよい。 Alternatively, the spiral belt 100 may be configured by winding one rubber-coated spiral cord 111 along the tire circumferential direction without using the cord unit 110.
　また、スパイラルベルト100及びスパイラルコード111は、周方向ベルト及び周方向コードなどと呼ばれてもよい。 Moreover, the spiral belt 100 and the spiral cord 111 may be called a circumferential belt and a circumferential cord.
　上述した実施形態では、空気入りタイヤ10は、乗用自動車などの四輪自動車向けの空気入りタイヤであり、特に、高性能四輪自動車（レース用車両を含む）に好適に用い得るものとして説明したが、空気入りタイヤ10は、一般的な乗用自動車に用いてもよいし、四輪自動車に限らず、スリップ角を利用してコーナリングする車両に広く用い得る。 In the above-described embodiment, the pneumatic tire 10 is a pneumatic tire for four-wheeled vehicles such as passenger cars, and is described as being particularly suitable for high-performance four-wheeled vehicles (including racing vehicles). However, the pneumatic tire 10 may be used for general passenger cars and is not limited to four-wheeled cars, but may be widely used for vehicles that corner by utilizing slip angles.
　上記のように、本発明の実施形態を記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかとなろう。 As described above, the embodiments of the present invention have been described, but it should not be understood that the descriptions and drawings forming a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operation techniques will be apparent to those skilled in the art.
　10　空気入りタイヤ
　20　トレッド
　30　タイヤサイド部
　40　カーカス
　41　カーカスコード
　50　交錯ベルト層
　51, 52　交錯ベルト
　51a, 52a　ベルトコード
　60　ビード部
　100　スパイラルベルト
　110　コードユニット
　111　スパイラルコード 10 Pneumatic tire 20 Tread 30 Tire side 40 Carcass 41 Carcass cord 50 Cross belt layer 51, 52 Cross belt 51a, 52a Belt cord 60 Bead 100 Spiral belt 110 Cord unit 111 Spiral cord

Claims (7)

  1. 　路面に接するトレッドと、
    　前記トレッドのタイヤ径方向内側に設けられる補強ベルトと
    を少なくとも備えたタイヤであって、
    　前記補強ベルトは、タイヤ周方向と略平行になるように巻き回された補強コードを有し、
    　前記補強コードの引張破断強度は、10cN/dtex以上であり、
    　前記補強コードの破断時伸びは、13%以下であるタイヤ。     A tread that touches the road,
    A tire having at least a reinforcing belt provided on the tire radial direction inner side of the tread,
    The reinforcing belt has a reinforcing cord wound so as to be substantially parallel to the tire circumferential direction,
    The tensile breaking strength of the reinforcing cord is 10 cN/dtex or more,
    A tire having an elongation at break of the reinforcing cord of 13% or less.
  2. 　前記補強コードは、有機繊維またはスチールによって形成される請求項１に記載のタイヤ。 The tire according to claim 1, wherein the reinforcing cord is made of organic fiber or steel.
  3. 　前記補強ベルトのタイヤ径方向内側には、一対の交錯ベルトによって構成される交錯ベルト層が設けられ、
    　前記交錯ベルト層は、タイヤ幅方向に対して傾斜したベルトコードを有し、
    　前記ベルトコードは、有機繊維またはスチールによって形成される請求項１または２に記載のタイヤ。     On the inner side in the tire radial direction of the reinforcing belt, an intersecting belt layer configured by a pair of intersecting belts is provided,
    The intersecting belt layer has a belt cord inclined with respect to the tire width direction,
    The tire according to claim 1, wherein the belt cord is made of organic fiber or steel.
  4. 　タイヤ幅方向における前記補強コードの配置間隔は、10本／cm以上である請求項１乃至３の何れか一項に記載のタイヤ。 The tire according to any one of claims 1 to 3, wherein the reinforcing cords are arranged at intervals of 10 cords/cm or more in the tire width direction.
  5. 　前記補強ベルトは、タイヤ幅方向において、前記トレッドの全幅の80%以上の領域に設けられる請求項１乃至４の何れか一項に記載のタイヤ。 The tire according to any one of claims 1 to 4, wherein the reinforcing belt is provided in an area of 80% or more of the total width of the tread in the tire width direction.
  6. 　前記補強ベルトは、複数の前記補強コードがタイヤ幅方向に沿って配置されたコードユニットがタイヤ周方向に沿って巻き回されることによって構成される請求項１乃至５の何れか一項に記載のタイヤ。 The reinforcing belt according to any one of claims 1 to 5, wherein a cord unit in which a plurality of the reinforcing cords are arranged in a tire width direction is wound around a tire circumferential direction. Tires.
  7. 　前記コードユニットのタイヤ幅方向におけるサイズは、前記トレッドの全幅の4%以下である請求項６に記載のタイヤ。 The tire according to claim 6, wherein the size of the cord unit in the tire width direction is 4% or less of the total width of the tread.
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