WO2020090982A1 - Tire - Google Patents

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Publication number
WO2020090982A1
WO2020090982A1 PCT/JP2019/042840 JP2019042840W WO2020090982A1 WO 2020090982 A1 WO2020090982 A1 WO 2020090982A1 JP 2019042840 W JP2019042840 W JP 2019042840W WO 2020090982 A1 WO2020090982 A1 WO 2020090982A1
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WIPO (PCT)
Prior art keywords
bead
tire
plate portion
radial direction
bead core
Prior art date
Application number
PCT/JP2019/042840
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French (fr)
Japanese (ja)
Inventor
福島　敦
Original Assignee
株式会社ブリヂストン
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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 WO2020090982A1 publication Critical patent/WO2020090982A1/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
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead

Definitions

  • the present invention relates to a tire in which a part of a bead portion is made of a resin material.
  • Patent Document 1 a tire in which a resin plate is provided in a bead portion has been known for the purpose of improving steering stability of a vehicle.
  • a resin plate is provided on the outside of the bead core in the tire width direction.
  • an object of the present invention is to provide a tire that is capable of achieving both suppression of weight increase and steering stability at a higher level.
  • a tread portion that is in contact with a road surface, a tire side portion that is continuous with the tread portion, is located on a tire radial direction inner side of the tread portion, and is connected with the tire side portion, and a tire diameter of the tire side portion.
  • a tire including an annular bead portion located on the inner side in the direction, wherein the bead portion includes a bead structure having a bead core in which a bead cord is covered with a resin material, and the bead structure is formed of a resin material.
  • the plate portion is formed, the plate portion is continuous with the bead core, and extends outward in the tire radial direction.
  • FIG. 1 is a sectional view of a pneumatic tire 10.
  • FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10.
  • FIG. 3 is an enlarged cross-sectional view of the bead portion 60.
  • FIG. 4 is an enlarged cross-sectional view of the bead portion 60 according to the modification.
  • FIG. 5 is an enlarged cross-sectional view of a bead portion 60 according to another modification.
  • 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. In FIG. 1, cross-sectional hatching is omitted (the same applies below).
  • the pneumatic tire 10 includes a tread portion 20, a tire side portion 30, a carcass ply 40, a belt layer 50 and a bead portion 60.
  • the tread part 20 is a part that contacts the road surface (not shown).
  • the tread portion 20 is formed with a pattern (not shown) according to the usage environment of the pneumatic tire 10 and the type of vehicle to which the pneumatic tire 10 is attached.
  • Tire side part 30 is connected to the tread part 20 and is located inside the tire radial direction of the tread part 20.
  • the tire side portion 30 is an area from the tire width direction outer end of the tread portion 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 ply 40 forms the skeleton of the pneumatic tire 10.
  • the carcass ply 40 has a radial structure in which carcass cords (not shown) radially arranged along the tire radial direction are covered with a rubber material.
  • the structure is not limited to the radial structure, and may be a bias structure in which the carcass cords are arranged so as to intersect in the tire radial direction.
  • the carcass cord is not particularly limited, and may be formed of an organic fiber cord similarly to a tire for a general passenger car.
  • the belt layer 50 is provided inside the tread portion 20 in the tire radial direction.
  • the belt layer 50 is a single-layer spiral belt having a reinforcing cord 51, and the reinforcing cord 51 is covered with a resin.
  • the belt layer 50 is not limited to the single-layer spiral belt.
  • the belt layer 50 may be a two-layer cross belt covered with rubber.
  • a resin material having a higher tensile elastic modulus than the rubber material forming the tire side portion 30 and the rubber material forming the tread portion 20 is used for the resin that covers the reinforcing cord 51.
  • a resin covering the reinforcing cord 51 a thermoplastic resin having elasticity, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used. Considering elasticity during running and moldability during manufacturing, it is desirable to use a thermoplastic elastomer.
  • thermoplastic elastomers include polyolefin thermoplastic elastomer (TPO), polystyrene thermoplastic elastomer (TPS), polyamide thermoplastic elastomer (TPA), polyurethane thermoplastic elastomer (TPU), polyester thermoplastic elastomer (TPC). , Dynamically crosslinked thermoplastic elastomer (TPV) and the like.
  • thermoplastic resin examples include polyurethane resin, polyolefin resin, vinyl chloride resin, and polyamide resin.
  • the deflection temperature under load (at 0.45MPa load) specified by ISO75-2 or ASTM D648 is 78 ° C or more
  • the tensile yield strength specified by JIS K7113 is 10MPa or more.
  • a material having a tensile elongation at break of 50% or more specified in JIS K7113 and a Vicat softening temperature (A method) of 130 ° C or more specified in JIS K7206 can be used.
  • 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 extending in the tire circumferential direction.
  • a part of the bead portion 60 is made of a resin material appropriately selected from the above resin materials.
  • a part of the bead portion 60 is formed of the same resin material as that used for the belt layer 50 described above.
  • the bead portion 60 is locked to a flange portion 110 (not shown in FIG. 1, see FIG. 2) formed at the radially outer end of the rim wheel 100.
  • an inner liner (not shown) that prevents the air (or a gas such as nitrogen) filled in the internal space of the pneumatic tire 10 assembled to the rim wheel 100 from leaking is provided on the inner surface of the pneumatic tire 10. It is pasted.
  • FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10. Specifically, FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10 including the bead portion 60 along the tire width direction and the tire radial direction.
  • the carcass ply 40 is folded back to the outside in the tire width direction via the bead portion 60.
  • the carcass ply 40 includes a body portion 41 and a folded portion 42.
  • the body portion 41 is provided over the tread portion 20, the tire side portion 30, and the bead portion 60, and is folded back at the bead portion 60, specifically, the bead core 62 (not shown in FIG. 2, see FIG. 3). Part of.
  • the folded-back portion 42 is a portion that is continuous with the main body portion 41 and is folded back to the outside in the tire width direction via the bead core 62.
  • the bead portion 60 includes a bead structure 61 having a bead core 62.
  • a bead filler 63 is provided outside the bead core 62 in the tire radial direction.
  • the bead filler 63 is provided so as to fill the space between the main body portion 41 of the carcass ply 40 and the folded-back portion 42.
  • the bead structure 61 has an L shape (or an inverted L shape), that is, a hook shape, in a cross-sectional view along the tire width direction and the tire radial direction of the pneumatic tire 10.
  • the bead structure 61 and the bead filler 63 are located inside the rim line 90 in the tire radial direction.
  • FIG. 3 is an enlarged sectional view of the bead section 60. Specifically, FIG. 3 is an enlarged cross-sectional view of the bead portion 60 along the tire width direction and the tire radial direction of the pneumatic tire 10.
  • the bead structure 61 has a bead core 62 and a plate portion 64.
  • the bead core 62 is formed by coating a bead cord 62a made of a metal material (for example, steel) with a resin material. That is, the bead core 62 is formed using a metal material.
  • the bead core 62, specifically, the bead cord 62a may be formed of an organic fiber, a carbon fiber or an inorganic fiber instead of a metal material.
  • the plate portion 64 is formed integrally with the bead core 62. That is, the plate portion 64 is continuous with the bead core 62 and extends outward in the tire radial direction.
  • the plate portion 64 is also made of a resin material.
  • the resin material used for the bead core 62 and the plate portion 64 may be the same as the resin material used for the belt layer 50.
  • the bead core 62 and the plate portion 64 do not necessarily have to be formed of the same resin material as that used for the belt layer 50. That is, the resin materials used for the belt layer 50, the bead core 62, and the plate portion 64 may be different as long as they are the above-mentioned resin materials that can be used for the belt layer 50.
  • the plate portion 64 extends outward in the tire radial direction from either end of the bead core 62 in the tire width direction. In the present embodiment, the plate portion 64 extends from the end portion of the bead core 62 on the outer side in the tire width direction to the outer side in the tire radial direction.
  • the plate portion 64 has an annular shape extending along the tire circumferential direction.
  • the plate portion 64 has a flat plate shape with a substantially constant thickness.
  • the bead filler 63 is a separate body from the bead structure 61 and is provided on the side of the plate portion 64. Further, the folded portion 42 of the carcass ply 40 extends to the side of the plate portion 64.
  • the bead filler 63 is provided on the side of the plate portion 64 on the inner side in the tire width direction. Further, the folded-back portion 42 extends to the side of the plate portion 64. Specifically, the folded-back portion 42 extends to the outside of the plate portion 64 in the tire width direction.
  • the end portion 42a of the folded-back portion 42 is located outside the plate portion 64 in the tire radial direction. That is, the end portion 42a is located on the outer side in the tire radial direction with respect to the outer end in the tire radial direction of the plate portion 64.
  • the bead core 62 is formed by coating the bead cord 62a with a resin material. Thereby, the weight increase can be suppressed more than the bead core which covers the bead cord 62a using the conventional rubber material.
  • the bead structure 61 has a plate portion 64 formed of a resin material.
  • the plate portion 64 is continuous with the bead core 62 and extends outward in the tire radial direction.
  • Such a plate portion 64 is continuous with the bead core 62 and integrated, and functions as a reinforcing member for the bead portion 60. Therefore, it contributes to the improvement of the steering stability of the vehicle in which the pneumatic tire 10 is mounted.
  • the plate portion 64 extends from the end portion of the bead core 62 on the outer side in the tire width direction to the outer side in the tire radial direction. Therefore, the plate portion 64 can be provided at a position apart from the main body portion 41 of the carcass ply 40, and the rigidity of the bead portion 60 as a whole can be easily increased. This can further improve the steering stability.
  • the bead filler 63 is provided on the side of the plate portion 64. Therefore, the bead structure 61 having the plate portion 64 and the bead filler 63 can integrally function as a reinforcing member for the bead portion 60. This can further improve the steering stability.
  • the folded portion 42 of the carcass ply 40 extends to the side of the plate portion 64. Therefore, the plate portion 64 and the folded portion 42 can be brought into close contact with each other, and the rigidity of the bead portion 60 can be further improved. This can further improve the steering stability.
  • FIG. 4 is an enlarged cross-sectional view of the bead portion 60 according to the modification. Specifically, FIG. 4 is an enlarged cross-sectional view of the bead portion 60 of the pneumatic tire 10 along the tire width direction and the tire radial direction.
  • the bead structure 61A has a plate portion 64A.
  • the plate portion 64A extends from the end portion of the bead core 62 on the inner side in the tire width direction to the outer side in the tire radial direction.
  • the plate portion 64A is provided so as to be inclined along the side surface of the bead filler 63 according to the shape of the bead portion 60.
  • the bead structure 63 may be assembled more easily than the bead structure 61.
  • the bead structure 61 is easier to enhance the steering stability than the bead structure 61A.
  • FIG. 5 is an enlarged sectional view of a bead portion 60 according to another modification. Specifically, FIG. 5 is an enlarged cross-sectional view of the bead portion 60 along the tire width direction and the tire radial direction of the pneumatic tire 10.
  • the bead structure 61B and the plate portion 64B are formed separately. Since the bead structure 61B and the plate portion 64B are both made of a resin material, they may be bonded with an adhesive or may be welded in the vulcanization step.
  • bead filler 63 may be adhered or welded to the bead structure 61B without being limited to the above-described modified example.
  • the bead filler 63 may be omitted depending on the type and size of the pneumatic tire 10. Furthermore, the carcass ply 40 does not have to be largely folded back via the bead core 62, and the end portion 42a of the folded-back portion 42 may be located near the bead core 62.

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

Abstract

The bead portion (60) of a pneumatic tire (10) includes a bead structure (61) having a bead core (62) obtained by covering bead cord with a resin material. The bead structure (61) has a plate portion (64) formed from a resin material. The plate portion (64) is continuous with the bead core (62) and extends outward in the tire radial direction.

Description

タイヤtire
　本発明は、ビード部の一部が樹脂材料によって形成されているタイヤに関する。 The present invention relates to a tire in which a part of a bead portion is made of a resin material.
　従来、車両の操縦安定性の向上を目的として、樹脂製のプレートがビード部に設けられたタイヤが知られている（特許文献１参照）。 Conventionally, a tire in which a resin plate is provided in a bead portion has been known for the purpose of improving steering stability of a vehicle (see Patent Document 1).
　具体的には、ビードコアのタイヤ幅方向外側に樹脂製のプレートが設けられる。 Specifically, a resin plate is provided on the outside of the bead core in the tire width direction.
特開2014-234074号公報JP 2014-234074 JP
　上述したようなタイヤによれば、樹脂製のプレートをビード部に設けることによって、重量の増加を抑制しつつ、操縦安定性を向上し得る。 According to the tire as described above, by providing the resin plate on the bead portion, it is possible to improve steering stability while suppressing an increase in weight.
　しかしながら、昨今では、重量増加の抑制と、操縦安定性とをさらに高い次元で両立し得るタイヤの提供が求められている。 However, in recent years, it has been required to provide tires that can both control the increase in weight and handle stability at a higher level.
　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、重量増加の抑制と、操縦安定性とをさらに高い次元で両立し得る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 of the present invention is to provide a tire that is capable of achieving both suppression of weight increase and steering stability at a higher level.
　本発明の一態様は、路面に接するトレッド部と、前記トレッド部に連なり、前記トレッド部のタイヤ径方向内側に位置するタイヤサイド部と、前記タイヤサイド部に連なり、前記タイヤサイド部のタイヤ径方向内側に位置する円環状のビード部とを含むタイヤであって、前記ビード部は、ビードコードが樹脂材料によって被覆されたビードコアを有するビード構造体を含み、前記ビード構造体は、樹脂材料によって形成されるプレート部を有し、前記プレート部は、前記ビードコアと連なり、タイヤ径方向外側に延びる。 One aspect of the present invention, a tread portion that is in contact with a road surface, a tire side portion that is continuous with the tread portion, is located on a tire radial direction inner side of the tread portion, and is connected with the tire side portion, and a tire diameter of the tire side portion. A tire including an annular bead portion located on the inner side in the direction, wherein the bead portion includes a bead structure having a bead core in which a bead cord is covered with a resin material, and the bead structure is formed of a resin material. The plate portion is formed, the plate portion is continuous with the bead core, and extends outward in the tire radial direction.
図１は、空気入りタイヤ10の断面図である。FIG. 1 is a sectional view of a pneumatic tire 10. 図２は、空気入りタイヤ10の一部拡大断面図である。FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10. 図３は、ビード部60の拡大断面図である。FIG. 3 is an enlarged cross-sectional view of the bead portion 60. 図４は、変更例に係るビード部60の拡大断面図である。FIG. 4 is an enlarged cross-sectional view of the bead portion 60 according to the modification. 図５は、他の変更例に係るビード部60の拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a bead portion 60 according to another modification.
　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 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は省略されている（以下同）。 (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. In FIG. 1, cross-sectional hatching is omitted (the same applies below).
　図１に示すように、空気入りタイヤ10は、トレッド部20、タイヤサイド部30、カーカスプライ40、ベルト層50及びビード部60を備える。 As shown in FIG. 1, the pneumatic tire 10 includes a tread portion 20, a tire side portion 30, a carcass ply 40, a belt layer 50 and a bead portion 60.
　トレッド部20は、路面（不図示）に接する部分である。トレッド部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。 The tread part 20 is a part that contacts the road surface (not shown). The tread portion 20 is formed with a pattern (not shown) according to the usage environment of the pneumatic tire 10 and the type of vehicle to which the pneumatic tire 10 is attached.
　タイヤサイド部30は、トレッド部20に連なり、トレッド部20のタイヤ径方向内側に位置する。タイヤサイド部30は、トレッド部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 part 30 is connected to the tread part 20 and is located inside the tire radial direction of the tread part 20. The tire side portion 30 is an area from the tire width direction outer end of the tread portion 20 to the upper end of the bead portion 60. The tire side portion 30 is sometimes called a sidewall or the like.
　カーカスプライ40は、空気入りタイヤ10の骨格を形成する。カーカスプライ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（不図示）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、ラジアル構造に限定されず、カーカスコード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 ply 40 forms the skeleton of the pneumatic tire 10. The carcass ply 40 has a radial structure in which carcass cords (not shown) radially arranged along the tire radial direction are covered with a rubber material. However, the structure is not limited to the radial structure, and may be a bias structure in which the carcass cords are arranged so as to intersect in the tire radial direction.
　また、カーカスコードは、特に限定されず、概ね一般的な乗用自動車用のタイヤと同様に有機繊維のコードによって形成し得る。 Also, the carcass cord is not particularly limited, and may be formed of an organic fiber cord similarly to a tire for a general passenger car.
　ベルト層50は、トレッド部20のタイヤ径方向内側に設けられる。ベルト層50は、補強コード51を有し、補強コード51が樹脂によって被覆された単層スパイラルベルトである。但し、ベルト層50は、単層スパイラルベルトに限定されない。例えば、ベルト層50は、ゴムによって被覆された２層交錯ベルトでもよい。 The belt layer 50 is provided inside the tread portion 20 in the tire radial direction. The belt layer 50 is a single-layer spiral belt having a reinforcing cord 51, and the reinforcing cord 51 is covered with a resin. However, the belt layer 50 is not limited to the single-layer spiral belt. For example, the belt layer 50 may be a two-layer cross belt covered with rubber.
　補強コード51を被覆する樹脂には、タイヤサイド部30を構成するゴム材料、及びトレッド部20を構成するゴム材料よりも引張弾性率の高い樹脂材料が用いられる。補強コード51を被覆する樹脂としては、弾性を有する熱可塑性樹脂、熱可塑性エラストマー（TPE）、及び熱硬化性樹脂等を用いることができる。走行時の弾性と製造時の成形性を考慮すると、熱可塑性エラストマーを用いることが望ましい。 A resin material having a higher tensile elastic modulus than the rubber material forming the tire side portion 30 and the rubber material forming the tread portion 20 is used for the resin that covers the reinforcing cord 51. As the resin covering the reinforcing cord 51, a thermoplastic resin having elasticity, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used. Considering elasticity during running and moldability during manufacturing, it is desirable to use a thermoplastic elastomer.
　熱可塑性エラストマーとしては、ポリオレフィン系熱可塑性エラストマー（TPO）、ポリスチレン系熱可塑性エラストマー（TPS）、ポリアミド系熱可塑性エラストマー（TPA）、ポリウレタン系熱可塑性エラストマー（TPU）、ポリエステル系熱可塑性エラストマー（TPC）、動的架橋型熱可塑性エラストマー（TPV）などが挙げられる。 The thermoplastic elastomers include polyolefin thermoplastic elastomer (TPO), polystyrene thermoplastic elastomer (TPS), polyamide thermoplastic elastomer (TPA), polyurethane thermoplastic elastomer (TPU), polyester thermoplastic elastomer (TPC). , Dynamically crosslinked thermoplastic elastomer (TPV) and the like.
　また、熱可塑性樹脂としては、ポリウレタン樹脂、ポリオレフィン樹脂、塩化ビニル樹脂、ポリアミド樹脂等が挙げられる。さらに、熱可塑性樹脂材料としては、例えば、ISO75－2またはASTM D648に規定されている荷重たわみ温度（0.45MPa荷重時）が78°Ｃ以上、JIS K7113に規定される引張降伏強さが10MPa以上、同じくJIS K7113に規定される引張破壊伸びが50％以上、JIS K7206に規定されるビカット軟化温度（Ａ法）が130°Ｃ以上であるものを用いることができる。 Further, examples of the thermoplastic resin include polyurethane resin, polyolefin resin, vinyl chloride resin, and polyamide resin. Furthermore, as the thermoplastic resin material, for example, the deflection temperature under load (at 0.45MPa load) specified by ISO75-2 or ASTM D648 is 78 ° C or more, and the tensile yield strength specified by JIS K7113 is 10MPa or more. Similarly, a material having a tensile elongation at break of 50% or more specified in JIS K7113 and a Vicat softening temperature (A method) of 130 ° C or more specified in JIS K7206 can be used.
　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、タイヤ周方向に延びる円環状である。 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 extending in the tire circumferential direction.
　ビード部60の一部は、上述した樹脂材料から適宜選択された樹脂材料によって構成される。本実施形態では、ビード部60の一部は、上述したベルト層50に用いられている樹脂材料と同一の樹脂材料によって形成されている。 A part of the bead portion 60 is made of a resin material appropriately selected from the above resin materials. In this embodiment, a part of the bead portion 60 is formed of the same resin material as that used for the belt layer 50 described above.
　ビード部60は、リムホイール100の径方向外側端に形成されるフランジ部分110（図１において不図示、図２参照）に係止される。 The bead portion 60 is locked to a flange portion 110 (not shown in FIG. 1, see FIG. 2) formed at the radially outer end of the rim wheel 100.
　また、空気入りタイヤ10のタイヤ内側面には、リムホイール100に組み付けられた空気入りタイヤ10の内部空間に充填された空気（または窒素などの気体）漏れを防止するインナーライナー（不図示）が貼り付けられている。 Further, an inner liner (not shown) that prevents the air (or a gas such as nitrogen) filled in the internal space of the pneumatic tire 10 assembled to the rim wheel 100 from leaking is provided on the inner surface of the pneumatic tire 10. It is pasted.
　（２）ビード部の概略構成
　図２は、空気入りタイヤ10の一部拡大断面図である。具体的には、図２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ビード部60を含む一部拡大断面図である。 (2) Schematic configuration of the bead portion FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10. Specifically, FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10 including the bead portion 60 along the tire width direction and the tire radial direction.
　図２に示すように、カーカスプライ40は、ビード部60を介してタイヤ幅方向外側に折り返される。具体的には、カーカスプライ40は、本体部41と折り返し部42とを含む。 As shown in FIG. 2, the carcass ply 40 is folded back to the outside in the tire width direction via the bead portion 60. Specifically, the carcass ply 40 includes a body portion 41 and a folded portion 42.
　本体部41は、トレッド部20、タイヤサイド部30及びビード部60に亘って設けられ、ビード部60、具体的には、ビードコア62（図２おいて不図示、図３参照）において折り返されるまでの部分である。 The body portion 41 is provided over the tread portion 20, the tire side portion 30, and the bead portion 60, and is folded back at the bead portion 60, specifically, the bead core 62 (not shown in FIG. 2, see FIG. 3). Part of.
　折り返し部42は、本体部41に連なり、ビードコア62を介してタイヤ幅方向外側に折り返された部分である。 The folded-back portion 42 is a portion that is continuous with the main body portion 41 and is folded back to the outside in the tire width direction via the bead core 62.
　ビード部60は、ビードコア62を有するビード構造体61を含む。ビードコア62のタイヤ径方向外側には、ビードフィラー63が設けられる。ビードフィラー63は、カーカスプライ40の本体部41と折り返し部42との間に空間を埋めるように設けられる。 The bead portion 60 includes a bead structure 61 having a bead core 62. A bead filler 63 is provided outside the bead core 62 in the tire radial direction. The bead filler 63 is provided so as to fill the space between the main body portion 41 of the carcass ply 40 and the folded-back portion 42.
　ビード構造体61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視において、L字状（または逆L字状）、つまり、鉤状である。 The bead structure 61 has an L shape (or an inverted L shape), that is, a hook shape, in a cross-sectional view along the tire width direction and the tire radial direction of the pneumatic tire 10.
　本実施形態では、ビード構造体61及びビードフィラー63は、リムライン90よりもタイヤ径方向内側に位置する。 In the present embodiment, the bead structure 61 and the bead filler 63 are located inside the rim line 90 in the tire radial direction.
　（３）ビード部の詳細構成
　図３は、ビード部60の拡大断面図である。具体的には、図３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ビード部60の拡大断面図である。 (3) Detailed Configuration of Bead Section FIG. 3 is an enlarged sectional view of the bead section 60. Specifically, FIG. 3 is an enlarged cross-sectional view of the bead portion 60 along the tire width direction and the tire radial direction of the pneumatic tire 10.
　図３に示すように、ビード構造体61は、ビードコア62及びプレート部64を有する。ビードコア62は、金属材料（例えば、スチール）で形成されたビードコード62aが樹脂材料によって被覆されることによって形成される。つまり、ビードコア62は、金属材料を用いて形成される。なお、ビードコア62、具体的には、ビードコード62aは、金属材料ではなく、有機繊維、炭素繊維または無機繊維によって形成されてもよい。 As shown in FIG. 3, the bead structure 61 has a bead core 62 and a plate portion 64. The bead core 62 is formed by coating a bead cord 62a made of a metal material (for example, steel) with a resin material. That is, the bead core 62 is formed using a metal material. The bead core 62, specifically, the bead cord 62a may be formed of an organic fiber, a carbon fiber or an inorganic fiber instead of a metal material.
　本実施形態では、プレート部64は、ビードコア62と一体として形成される。つまり、プレート部64は、ビードコア62と連なり、タイヤ径方向外側に延びる。プレート部64も樹脂材料によって形成される。 In this embodiment, the plate portion 64 is formed integrally with the bead core 62. That is, the plate portion 64 is continuous with the bead core 62 and extends outward in the tire radial direction. The plate portion 64 is also made of a resin material.
　ビードコア62及びプレート部64に用いられる樹脂材料は、ベルト層50に用いられている樹脂材料と同一としてもよい。但し、ビードコア62とプレート部64とは、必ずしもベルト層50に用いられている樹脂材料と同一の樹脂材料によって形成されていなくても構わない。つまり、ベルト層50に用い得る上述した樹脂材料であれば、ベルト層50と、ビードコア62と、プレート部64とに用いられる樹脂材料は、異なっていてもよい。 The resin material used for the bead core 62 and the plate portion 64 may be the same as the resin material used for the belt layer 50. However, the bead core 62 and the plate portion 64 do not necessarily have to be formed of the same resin material as that used for the belt layer 50. That is, the resin materials used for the belt layer 50, the bead core 62, and the plate portion 64 may be different as long as they are the above-mentioned resin materials that can be used for the belt layer 50.
　プレート部64は、ビードコア62のタイヤ幅方向における何れかの端部からタイヤ径方向外側に延びる。本実施形態では、プレート部64は、ビードコア62のタイヤ幅方向外側の端部からタイヤ径方向外側に延びる。 The plate portion 64 extends outward in the tire radial direction from either end of the bead core 62 in the tire width direction. In the present embodiment, the plate portion 64 extends from the end portion of the bead core 62 on the outer side in the tire width direction to the outer side in the tire radial direction.
　また、プレート部64は、タイヤ周方向に沿って延びる円環状である。プレート部64は、厚さがほぼ一定の平板状である。 Also, the plate portion 64 has an annular shape extending along the tire circumferential direction. The plate portion 64 has a flat plate shape with a substantially constant thickness.
　ビードフィラー63は、ビード構造体61とは別体であり、プレート部64の側方に設けられる。また、カーカスプライ40の折り返し部42は、プレート部64の側方まで延びる。 The bead filler 63 is a separate body from the bead structure 61 and is provided on the side of the plate portion 64. Further, the folded portion 42 of the carcass ply 40 extends to the side of the plate portion 64.
　具体的には、ビードフィラー63は、プレート部64のタイヤ幅方向内側の側方に設けられる。また、折り返し部42は、プレート部64の側方まで延びる。具体的には、折り返し部42は、プレート部64のタイヤ幅方向外側の側方まで延びる。 Specifically, the bead filler 63 is provided on the side of the plate portion 64 on the inner side in the tire width direction. Further, the folded-back portion 42 extends to the side of the plate portion 64. Specifically, the folded-back portion 42 extends to the outside of the plate portion 64 in the tire width direction.
　折り返し部42の端部42aは、プレート部64よりもタイヤ径方向外側に位置する。つまり、端部42aは、プレート部64のタイヤ径方向外側端よりもタイヤ径方向外側に位置する。 The end portion 42a of the folded-back portion 42 is located outside the plate portion 64 in the tire radial direction. That is, the end portion 42a is located on the outer side in the tire radial direction with respect to the outer end in the tire radial direction of the plate portion 64.
　（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。具体的には、ビードコア62は、ビードコード62aが樹脂材料によって被覆されることによって形成される。これにより、従来のゴム材料を用いてビードコード62aを被覆するビードコアよりも重量増加を抑制し得る。 (4) Operation / Effect According to the above-described embodiment, the following operation / effect can be obtained. Specifically, the bead core 62 is formed by coating the bead cord 62a with a resin material. Thereby, the weight increase can be suppressed more than the bead core which covers the bead cord 62a using the conventional rubber material.
　また、ビード構造体61は、樹脂材料によって形成されるプレート部64を有する。プレート部64は、ビードコア62と連なり、タイヤ径方向外側に延びる。このようなプレート部64は、ビードコア62と連なって一体となっており、ビード部60の補強部材として機能する。
このため、空気入りタイヤ10が装着された車両の操縦安定性の向上に貢献する。 Further, the bead structure 61 has a plate portion 64 formed of a resin material. The plate portion 64 is continuous with the bead core 62 and extends outward in the tire radial direction. Such a plate portion 64 is continuous with the bead core 62 and integrated, and functions as a reinforcing member for the bead portion 60.
Therefore, it contributes to the improvement of the steering stability of the vehicle in which the pneumatic tire 10 is mounted.
　すなわち、空気入りタイヤ10によれば、重量増加の抑制と、操縦安定性とをさらに高い次元で両立し得る。 That is, according to the pneumatic tire 10, it is possible to achieve a higher level of both suppression of weight increase and steering stability.
　本実施形態では、プレート部64は、ビードコア62のタイヤ幅方向外側の端部からタイヤ径方向外側に延びる。このため、プレート部64をカーカスプライ40の本体部41から離れた位置に設けることができ、ビード部60全体としての剛性を高め易い。これにより、操縦安定性をさらに向上し得る。 In the present embodiment, the plate portion 64 extends from the end portion of the bead core 62 on the outer side in the tire width direction to the outer side in the tire radial direction. Therefore, the plate portion 64 can be provided at a position apart from the main body portion 41 of the carcass ply 40, and the rigidity of the bead portion 60 as a whole can be easily increased. This can further improve the steering stability.
　本実施形態では、ビードフィラー63は、プレート部64の側方に設けられる。このため、プレート部64を有するビード構造体61と、ビードフィラー63とが一体となってビード部60の補強部材と機能し得る。これにより、操縦安定性をさらに向上し得る。 In this embodiment, the bead filler 63 is provided on the side of the plate portion 64. Therefore, the bead structure 61 having the plate portion 64 and the bead filler 63 can integrally function as a reinforcing member for the bead portion 60. This can further improve the steering stability.
　本実施形態では、カーカスプライ40の折り返し部42は、プレート部64の側方まで延びる。このため、プレート部64と折り返し部42とを密着させることができ、ビード部60の剛性をさらに向上し得る。これにより、操縦安定性をさらに向上し得る。 In the present embodiment, the folded portion 42 of the carcass ply 40 extends to the side of the plate portion 64. Therefore, the plate portion 64 and the folded portion 42 can be brought into close contact with each other, and the rigidity of the bead portion 60 can be further improved. This can further improve the steering stability.
　（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 contents of the present invention have 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、上述したビード部60の構造は、次にように変更してもよい。図４は、変更例に係るビード部60の拡大断面図である。具体的には、図４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ビード部60の拡大断面図である。 For example, the structure of the bead portion 60 described above may be changed as follows. FIG. 4 is an enlarged cross-sectional view of the bead portion 60 according to the modification. Specifically, FIG. 4 is an enlarged cross-sectional view of the bead portion 60 of the pneumatic tire 10 along the tire width direction and the tire radial direction.
　図４に示すように、ビード構造体61Aは、プレート部64Aを有する。プレート部64Aは、ビードコア62のタイヤ幅方向内側の端部からタイヤ径方向外側に延びる。プレート部64Aは、ビード部60の形状に応じて、ビードフィラー63の側面に沿うように傾斜して設けられる。 As shown in FIG. 4, the bead structure 61A has a plate portion 64A. The plate portion 64A extends from the end portion of the bead core 62 on the inner side in the tire width direction to the outer side in the tire radial direction. The plate portion 64A is provided so as to be inclined along the side surface of the bead filler 63 according to the shape of the bead portion 60.
　ビード構造体61Aは、プレート部64Aが、ビードコア62のタイヤ幅方向内側の端部に設けられるため、ビードフィラー63の組み付けなど、ビード構造体61と比較すると製造が容易になり得る。一方、ビード構造体61は、ビード構造体61Aと比較すると、より操縦安定性を高め易い。 Since the plate portion 64A of the bead structure 61A is provided at the end portion of the bead core 62 on the inner side in the tire width direction, the bead structure 63 may be assembled more easily than the bead structure 61. On the other hand, the bead structure 61 is easier to enhance the steering stability than the bead structure 61A.
　図５は、他の変更例に係るビード部60の拡大断面図である。具体的には、図５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ビード部60の拡大断面図である。 FIG. 5 is an enlarged sectional view of a bead portion 60 according to another modification. Specifically, FIG. 5 is an enlarged cross-sectional view of the bead portion 60 along the tire width direction and the tire radial direction of the pneumatic tire 10.
　図５に示すように、ビード構造体61Bと、プレート部64Bとは、別体で形成されている。ビード構造体61Bとプレート部64Bとは、ともに樹脂材料が用いられているため、接着剤を用いて接着してもよいし、加硫工程において溶着させてもよい。 As shown in FIG. 5, the bead structure 61B and the plate portion 64B are formed separately. Since the bead structure 61B and the plate portion 64B are both made of a resin material, they may be bonded with an adhesive or may be welded in the vulcanization step.
　また、上述した変更例に限らず、ビードフィラー63は、ビード構造体61Bと接着または溶着されていてもよい。 Also, the bead filler 63 may be adhered or welded to the bead structure 61B without being limited to the above-described modified example.
　或いは、空気入りタイヤ10の種類やサイズによっては、ビードフィラー63は、省略されてもよい。さらに、カーカスプライ40は、ビードコア62を介して大きく折り返されていなくてもよく、折り返し部42の端部42aは、ビードコア62の近傍に位置してもよい。 Alternatively, the bead filler 63 may be omitted depending on the type and size of the pneumatic tire 10. Furthermore, the carcass ply 40 does not have to be largely folded back via the bead core 62, and the end portion 42a of the folded-back portion 42 may be located near the bead core 62.
　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　トレッド部
　30　タイヤサイド部
　40　カーカスプライ
　41　本体部
　42　折り返し部
　42a　端部
　50　ベルト層
　51　補強コード
　60　ビード部
　61, 61A, 61B　ビード構造体
　62　ビードコア
　62a　ビードコード
　63　ビードフィラー
　64, 64A, 64B　プレート部
　90　リムライン
　100　リムホイール
　110　フランジ部分 10 Pneumatic tire 20 Tread part 30 Tire side part 40 Carcass ply 41 Body part 42 Folded part 42a End part 50 Belt layer 51 Reinforcement cord 60 Bead part 61, 61A, 61B Bead structure 62 Bead core 62a Bead code 63 Bead filler 64, 64A, 64B Plate part 90 Rim line 100 Rim wheel 110 Flange part

Claims (5)

  1. 　路面に接するトレッド部と、
    　前記トレッド部に連なり、前記トレッド部のタイヤ径方向内側に位置するタイヤサイド部と、
    　前記タイヤサイド部に連なり、前記タイヤサイド部のタイヤ径方向内側に位置する円環状のビード部と
    を含むタイヤであって、
    　前記ビード部は、
    　ビードコードが樹脂材料によって被覆されたビードコアを有するビード構造体を含み、
    　前記ビード構造体は、樹脂材料によって形成されるプレート部を有し、
    　前記プレート部は、前記ビードコアと連なり、タイヤ径方向外側に延びるタイヤ。     With the tread part in contact with the road surface,
    Continuing with the tread portion, a tire side portion located on the tire radial direction inner side of the tread portion,
    A tire which is continuous with the tire side portion and includes an annular bead portion located on the tire radial direction inner side of the tire side portion,
    The bead portion is
    The bead cord includes a bead structure having a bead core covered with a resin material,
    The bead structure has a plate portion formed of a resin material,
    A tire in which the plate portion is continuous with the bead core and extends outward in the tire radial direction.
  2. 　前記プレート部は、前記ビードコアのタイヤ幅方向における何れかの端部からタイヤ径方向外側に延びる請求項１に記載のタイヤ。 The tire according to claim 1, wherein the plate portion extends outward in the tire radial direction from any end of the bead core in the tire width direction.
  3. 　前記ビード部は、前記ビードコアのタイヤ径方向外側に設けられるビードフィラーを含み、
    　前記ビードフィラーは、前記プレート部の側方に設けられる請求項１または２に記載のタイヤ。     The bead portion includes a bead filler provided on the tire radial outside of the bead core,
    The tire according to claim 1 or 2, wherein the bead filler is provided laterally of the plate portion.
  4. 　前記タイヤの骨格を形成するカーカスプライを備え、
    　前記カーカスプライは、
    　本体部と、
    　前記本体部に連なり、前記ビードコアを介してタイヤ幅方向外側に折り返された折り返し部と
    を有し、
    　前記折り返し部は、前記プレート部の側方まで延びる請求項１乃至３の何れか一項に記載のタイヤ。     A carcass ply forming the skeleton of the tire,
    The carcass ply is
    Body part,
    Continuing to the main body portion, and having a folded-back portion that is folded back to the outside in the tire width direction via the bead core,
    The tire according to any one of claims 1 to 3, wherein the folded-back portion extends to a side of the plate portion.
  5. 　前記ビードコードは、金属材料を用いて形成される請求項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 bead cord is formed by using a metal material.
PCT/JP2019/042840 2018-10-31 2019-10-31 Tire WO2020090982A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6325110A (en) * 1986-07-09 1988-02-02 ミシュラン、エ、コンパニ−、（コンパニ−、ゼネラ−ル、デ、ゼタブリスマン、ミシュラン） Bead wire with coating section for tire skin and manufactureof said bead wire
JP2011235835A (en) * 2010-05-13 2011-11-24 Yokohama Rubber Co Ltd:The Pneumatic tire
WO2013089111A1 (en) * 2011-12-12 2013-06-20 株式会社ブリヂストン Tire
JP2014234074A (en) * 2013-06-03 2014-12-15 住友ゴム工業株式会社 Pneumatic tire
WO2016017508A1 (en) * 2014-07-30 2016-02-04 株式会社ブリヂストン Tire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6325110A (en) * 1986-07-09 1988-02-02 ミシュラン、エ、コンパニ−、（コンパニ−、ゼネラ−ル、デ、ゼタブリスマン、ミシュラン） Bead wire with coating section for tire skin and manufactureof said bead wire
JP2011235835A (en) * 2010-05-13 2011-11-24 Yokohama Rubber Co Ltd:The Pneumatic tire
WO2013089111A1 (en) * 2011-12-12 2013-06-20 株式会社ブリヂストン Tire
JP2014234074A (en) * 2013-06-03 2014-12-15 住友ゴム工業株式会社 Pneumatic tire
WO2016017508A1 (en) * 2014-07-30 2016-02-04 株式会社ブリヂストン Tire

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