JP2019098649A - Green tire - Google Patents
Green tire Download PDFInfo
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- JP2019098649A JP2019098649A JP2017233251A JP2017233251A JP2019098649A JP 2019098649 A JP2019098649 A JP 2019098649A JP 2017233251 A JP2017233251 A JP 2017233251A JP 2017233251 A JP2017233251 A JP 2017233251A JP 2019098649 A JP2019098649 A JP 2019098649A
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- bead core
- bead
- width direction
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- section
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- 239000011324 bead Substances 0.000 claims abstract description 189
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 238000000926 separation method Methods 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 description 26
- 238000004073 vulcanization Methods 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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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
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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
- B60C15/05—Bead cores multiple, i.e. with two or more cores in each bead
-
- 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
- B60C2015/044—Bead cores characterised by a wrapping layer
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Tyre Moulding (AREA)
Abstract
Description
本発明は、グリーンタイヤに関する。 The present invention relates to a green tire.
特許文献１には、空気入りタイヤのビードコアについて、ゴムの厚さとワイヤ径の設定によって破壊強度を向上させることが開示されている。 Patent Document 1 discloses that the breaking strength of a bead core of a pneumatic tire is improved by setting the thickness of the rubber and the diameter of the wire.
しかしながら、特許文献１に開示されたものを含め、従来の空気入りタイヤは、被覆ゴムとワイヤとのセパレーションによるビードコアの故障発生の防止に関して改善の余地がある。 However, conventional pneumatic tires, including those disclosed in Patent Document 1, have room for improvement with regard to the prevention of the failure of the bead core due to the separation of the coated rubber and the wire.
本発明は、空気入りタイヤにおける被覆ゴムとワイヤとのセパレーションによるビードコアの故障発生を防止ないし抑制することを課題とする。 An object of the present invention is to prevent or suppress occurrence of failure of a bead core due to separation of a coated rubber and a wire in a pneumatic tire.
本発明の一態様は、一対のサイドウォール部の内径端にそれぞれ位置するビードコアを備え、前記ビードコアは、前記ビードコアの幅方向の断面において、前記ビードコアの幅方向及び前記ビードコアの径方向に間隔をあけて配置された複数本のビードワイヤと、前記複数本のビードワイヤ間に充填された被覆ゴムとを備え、前記ビードコアの幅方向の断面において、前記ビードコアの外形輪郭の断面積であるビードコア断面積に対する、前記被覆ゴムの面積割合が６５％以上７５％である、グリーンタイヤを提供する。 One aspect of the present invention includes bead cores respectively positioned at inner diameter ends of a pair of sidewall portions, and the bead cores are spaced apart in the width direction of the bead core and in the radial direction of the bead core in a cross section in the width direction of the bead core. A plurality of open bead wires and a covering rubber filled between the plurality of bead wires, wherein the cross-sectional area of the outer contour of the bead core is a cross-sectional area of the bead core in the cross section in the width direction of the bead core A green tire is provided, wherein the area ratio of the coated rubber is 65% or more and 75%.
ビードコア断面積に対する被覆ゴムの面積割合を６５％以上７５％に設定することで、ビードコアの幅方向及びビードコアの径方向に互いに隣接する２本のビードワイヤ間に、被覆ゴムが充填された隙間を十分に確保できる。被覆ゴムが充填された十分な隙間を確保することで、加硫成形時の被覆ゴムのゴム流れ不良に起因して、隣接する２本のビードワイヤが互いに接触することを防止し、被覆ゴムに対するビードワイヤの接着性を確保できる。その結果、このグリーンタイヤを加硫成形して得られた空気入りタイヤでは、被覆ゴムとビードワイヤとのセパレーションによるビードコアの故障発生を効果的に防止ないし抑制できる。 By setting the area ratio of the coating rubber to the bead core cross-sectional area to at least 65%, the gap filled with the coating rubber is sufficient between two bead wires adjacent to each other in the bead core width direction and the bead core radial direction. Can be secured. By securing a sufficient gap filled with the covering rubber, the adjacent two bead wires are prevented from coming into contact with each other due to the rubber flow failure of the covering rubber at the time of vulcanization molding, and the bead wire for the covering rubber The adhesion of As a result, in the pneumatic tire obtained by vulcanizing and molding this green tire, it is possible to effectively prevent or suppress the failure occurrence of the bead core due to the separation of the coated rubber and the bead wire.
加硫成形時の良好なゴム流れを確保するには、前記ビードコアの幅方向の断面において、前記複数本のビードワイヤが前記ビードコアの幅方向及び前記ビードコアの径方向にそれぞれ均一に配置されていることが好ましい。 In order to ensure a good rubber flow at the time of vulcanization molding, in the cross section in the width direction of the bead core, the plurality of bead wires are uniformly arranged in the width direction of the bead core and in the radial direction of the bead core. Is preferred.
前記ビードコアの幅方向の断面における、前記ビードコアの幅方向に互いに隣接する２本の前記ビードワイヤ間の最小間隔は、前記ビードコアの直径の０．５２倍以上０．７３倍以下に設定できる。 The minimum distance between two bead wires adjacent to each other in the width direction of the bead core in the cross section of the bead core in the width direction can be set to 0.52 times to 0.73 times the diameter of the bead core.
加硫成形時の良好なゴム流れを確保するには、ビードコアの幅方向に互いに隣接する２本のビードワイヤ間の最小間隔が広いことが好ましい。しかし、この最小間隔が広くなり過ぎると、加硫成形によって得られた空気入りタイヤにおいて、ビードコア全体としての剛性が低くなり、走行によって変形がしやすくなり、他モードの故障に対する耐久性が低下し得る。ビードコアの幅方向に互いに隣接する２本のビードワイヤ間の最小間隔を、ビードコアの直径の０．５２倍以上０．７３倍以下に設定することで、加硫成形時の良好なゴム流れと、加硫成形によって得られた空気入りタイヤにおけるビードコアの剛性確保とを両立できる。 In order to ensure good rubber flow during vulcanization molding, it is preferable that the minimum distance between two bead wires adjacent to each other in the width direction of the bead core be wide. However, if this minimum distance becomes too wide, in the pneumatic tire obtained by vulcanization molding, the rigidity as the entire bead core becomes low, deformation becomes easy by running, and the durability against failure in other modes is lowered. obtain. By setting the minimum distance between two bead wires adjacent to each other in the width direction of the bead core to be not less than 0.52 times and not more than 0.73 times the diameter of the bead core, good rubber flow during vulcanization molding, and vulcanization It is compatible with securing the rigidity of the bead core in the pneumatic tire obtained by vulcanization molding.
前記ビードコアの幅方向の断面における、前記ビードコアの径方向に互いに隣接する２本の前記ビードワイヤ間の最小間隔は、前記ビードコアの直径の０．４１倍以上０．６３倍以下に設定できる。 The minimum distance between two bead wires adjacent to each other in the radial direction of the bead core in a cross section in the width direction of the bead core can be set to 0.41 to 0.63 times the diameter of the bead core.
加硫成形時の良好なゴム流れを確保するには、ビードコアの径方向に互いに隣接する２本のビードコア間の最小間隔が広いことが好ましい。しかし、この最小間隔が広くなり過ぎると、加硫成形によって得られた空気入りタイヤにおいて、ビードコア全体としての剛性が低くなる。また、この最小間隔が広くなり過ぎると、加硫成形によって得られた空気入りタイヤをリムに装着した際に、ビードコアの径方向の外側に位置するビードワイヤはリムから離れたより大きな位置に配置されてしまう。かかる配置も、他モードの故障に対する耐久性の低下を生じ得る。ビードコアの径方向に互いに隣接する２本のビードワイヤ間の最小間隔を、ビードコアの直径の０．４１倍以上０．６３倍以下に設定することで、加硫成形時の良好なゴム流れと、加硫成形によって得られた空気入りタイヤにおけるビードコアの剛性確保とを両立できる。 In order to ensure a good rubber flow during vulcanization molding, it is preferable that the minimum distance between two bead cores adjacent to each other in the radial direction of the bead cores be wide. However, if this minimum distance becomes too wide, the rigidity of the bead core as a whole becomes low in the pneumatic tire obtained by vulcanization molding. Also, if the minimum distance becomes too large, when the pneumatic tire obtained by vulcanization molding is attached to the rim, the bead wire located radially outside of the bead core is disposed at a larger position away from the rim I will. Such an arrangement may also result in reduced durability to other modes of failure. By setting the minimum distance between two bead wires adjacent to each other in the radial direction of the bead core to 0.41 or more and 0.63 or less times the diameter of the bead core, good rubber flow at the time of vulcanization molding, and vulcanization It is compatible with securing the rigidity of the bead core in the pneumatic tire obtained by vulcanization molding.
前記ビードコアの幅方向の断面における、前記ビードコアの外形輪郭に最も隣接している前記ビードワイヤから前記外形輪郭までの前記ビードコアの幅方向の最短距離は、前記ビードコアの幅方向の断面における、前記ビードコアの幅方向に互いに隣接する２本の前記ビードワイヤ間の最小間隔の１／２を上回ることが好ましい。 In the cross section in the width direction of the bead core, the shortest distance in the width direction of the bead core from the bead wire closest to the outer contour of the bead core to the outer contour is the bead core in the cross section in the width direction of the bead core It is preferable to exceed 1⁄2 of the minimum distance between two bead wires adjacent to each other in the width direction.
ビードコアの外形輪郭に最も隣接しているビードワイヤから外形輪郭までの最短距離を十分に確保することで、加硫成形時のゴム流れに起因する当該ビードワイヤとカーカスプライの接触を防止し、ビードコアとカーカスプライの接着性を確保できる。 By securing the shortest distance from the bead wire closest to the outer contour of the bead core to the outer contour, the contact between the bead wire and the carcass ply resulting from the rubber flow during vulcanization molding is prevented, and the bead core and the carcass ply are Adhesiveness of ply can be secured.
本発明に係るグリーンタイヤを加硫成形して得られた空気入りタイヤは、被覆ゴムとワイヤとのセパレーションによるビードコアの故障発生を防止ないし抑制できる。 The pneumatic tire obtained by vulcanizing and forming the green tire according to the present invention can prevent or suppress the occurrence of failure of the bead core due to the separation of the coated rubber and the wire.
図１は本発明の実施形態に係るグリーンタイヤ１を示す。図１では、ビードコア６を除き、グリーンタイヤ１を加硫成形して空気入りタイヤが得られた後の形状を示している。グリーンタイヤ１は、トロイダル状のケーシング２を備える。ケーシング２の内周面にはインナーライナ（図示せず）が設けられている。ケーシング２は、トレッド部（図示せず）のタイヤ幅方向外端部に連なってタイヤ径方向内側に延びる一対のサイドウォール部３と、各サイドウォール部３の内径端に位置する一対のビード部４とを備えている。トレッド部及びサイドウォール部３のタイヤ内面側には、一対のビード部４の間に架け渡されるようにカーカスプライ５が配設されている。本実施形態に係るグリーンタイヤ１は、フォークリフト用であり、カーカスプライ５が備えるコード（例えば、スチールコード又は有機繊維コード）はタイヤの径方向に対して斜めに配置されている。 FIG. 1 shows a green tire 1 according to an embodiment of the present invention. FIG. 1 shows the shape after the green tire 1 is vulcanized and molded to obtain a pneumatic tire except for the bead core 6. The green tire 1 includes a toroidal casing 2. An inner liner (not shown) is provided on the inner peripheral surface of the casing 2. The casing 2 is connected to a tire width direction outer end portion of a tread portion (not shown), and a pair of sidewall portions 3 extending inward in the tire radial direction and a pair of bead portions positioned at the inner diameter end of each sidewall portion 3 It is equipped with four. A carcass ply 5 is disposed on the tire inner surface side of the tread portion and the sidewall portion 3 so as to be bridged between the pair of bead portions 4. The green tire 1 according to the present embodiment is for a forklift, and cords (for example, steel cords or organic fiber cords) provided in the carcass ply 5 are disposed obliquely to the radial direction of the tire.
各ビード部４は、環状のビードコア６と、ビードコア６のタイヤ径方向外側に配置されている同様に環状のビードフィラー７とを備える。図において、ビードコア６の幅方向を符号Ｗで示し、ビードコア６の径方向を符号Ｒで示している。 Each bead portion 4 includes an annular bead core 6 and a similarly annular bead filler 7 disposed on the tire radial direction outer side of the bead core 6. In the figure, the width direction of the bead core 6 is indicated by the symbol W, and the radial direction of the bead core 6 is indicated by the symbol R.
図２を併せて参照すると、ビードコア６は、本実施形態ではスチール製のビードワイヤ８と、ビードワイヤ８間に充填された被覆ゴム（インシュレーションゴム）９とを備える。より具体的には、ビードコア６の幅方向の断面（グリーンタイヤ１の子午線方向での断面）において、複数本（本実施形態では８本）のビードワイヤ８がビードコア６の幅方向（タイヤ幅方向と同方向）に間隔を開けて配置され、複数本（本実施形態では７本）のビードワイヤ８がビードコア６の径方向（タイヤ径方向と同方向）に間隔を開けて配置されている。本実施形態では、ビードコア６の幅方向の断面において、複数本のビードワイヤ８がビードコアの幅方向及びビードコアの径方向にそれぞれ均一に配置されている。 Referring also to FIG. 2, the bead core 6 comprises a bead wire 8 made of steel in the present embodiment and a coated rubber (insulation rubber) 9 filled between the bead wires 8. More specifically, in the cross section of the bead core 6 in the width direction (cross section in the meridian direction of the green tire 1), a plurality of (eight in the present embodiment) bead wires 8 are in the width direction of the bead core 6 (tire width direction A plurality of (7 in the present embodiment) bead wires 8 are arranged at intervals in the radial direction of the bead core 6 (the same direction as the tire radial direction). In the present embodiment, in the cross section of the bead core 6 in the width direction, the plurality of bead wires 8 are uniformly disposed in the width direction of the bead core and in the radial direction of the bead core.
図３を参照すると、本実施形態におけるビードコア６は、１列に引き揃えられた複数本（本実施形態では８本）のビードコア６を被覆ゴム９で被覆したテープ状体１０を、縦積み状に複数回（本実施形態では７回）巻回することで製造されている。
Referring to FIG. 3, in the bead core 6 in the present embodiment, a plurality of (eight in the present embodiment) bead cores 6 aligned in a single row are longitudinally stacked in a tape-
本実施形態におけるビードコア６の幅方向の断面形状は四角形である。より詳細には、ビードコア６の幅方向の断面における、ビードコア６の外形輪郭６ａは、ビードコア６の幅方向に対向する互いに平行な一対の長辺６ｂ，６ｃと、ビードコア６の径方向に対向する互いに平行な一対の短辺６ｄ，６ｅとを備える。
The cross-sectional shape in the width direction of the bead core 6 in the present embodiment is a square. More specifically, the
このグリーンタイヤ１を加硫成形して得られる空気入りタイヤにおけるリムテーパθは、例えば０度以上５度以下である。また、加硫成形後の被覆ゴム９の硬さは（ＪＩＳ Ｋ ６２５３のショアＡ硬さ）は、例えば７０以上９０以下である。 The rim taper θ in the pneumatic tire obtained by vulcanizing and forming the green tire 1 is, for example, 0 degrees or more and 5 degrees or less. Moreover, the hardness (Shore A hardness of JIS K 6253) of the coated rubber 9 after vulcanization molding is, for example, 70 or more and 90 or less.
ビードコア６の幅方向の断面における、ビードコア６の外形輪郭６ａの面積であるビードコア断面積に対して、被覆ゴムの面積割合は、６５％以上７５％以下に設定されている。
The area ratio of the covering rubber is set to 65% or more and 75% or less with respect to the bead core cross-sectional area which is the area of the
このグリーンタイヤ１を加硫成形して空気入りタイヤを製造する際、ビードコア６にはビードコア６の幅方向及び径方向に大きな圧縮力が作用する傾向がある。特に、本実施形態のようなバイアスタイヤの場合、その傾向が顕著である。しかし、ビードコア断面積に対する被覆ゴム９の面積割合を６５％以上７５％に設定することで、ビードコア６の幅方向及びビードコア６の径方向に互いに隣接する２本のビードワイヤ８間に、被覆ゴム９が充填された隙間を十分に確保できる。被覆ゴム９が充填された十分な隙間を確保することで、加硫成形時の被覆ゴム９のゴム流れ不良に起因して、隣接する２本のビードワイヤ８が互いに接触することを防止し、被覆ゴム９に対するビードワイヤ８の接着性を確保できる。その結果、このグリーンタイヤを加硫成形して得られた空気入りタイヤでは、被覆ゴム９とビードワイヤ８とのセパレーションによるビードコアの故障発生を効果的に防止ないし抑制できる。 When the green tire 1 is vulcanized and manufactured to produce a pneumatic tire, a large compressive force tends to act on the bead core 6 in the width direction and the radial direction of the bead core 6. In particular, in the case of a bias tire as in this embodiment, the tendency is remarkable. However, by setting the area ratio of the covering rubber 9 to the bead core cross-sectional area to at least 65%, the covering rubber 9 is formed between two bead wires 8 adjacent to each other in the width direction of the bead core 6 and the radial direction of the bead core 6. The space filled with can be secured sufficiently. By securing a sufficient gap filled with the covering rubber 9, it is possible to prevent adjacent two bead wires 8 from coming into contact with each other due to a rubber flow defect of the covering rubber 9 at the time of vulcanization molding, and covering The adhesion of the bead wire 8 to the rubber 9 can be secured. As a result, in the pneumatic tire obtained by vulcanizing and forming this green tire, it is possible to effectively prevent or suppress the occurrence of the failure of the bead core due to the separation of the coated rubber 9 and the bead wire 8.
ビードコア６の幅方向の断面における、ビードコア６の幅方向に互いに隣接する２本のビードワイヤ８間の最小間隔Ａは、ビードコア６の直径Ｄの０．５２倍以上０．７３倍以下に設定できる。例えば、ビードコア６の直径Ｄが０．９６ｍｍの場合、最小間隔Ａは０．５ｍｍ以上０．７ｍｍ以下に設定できる。 The minimum distance A between two bead wires 8 adjacent to each other in the width direction of the bead core 6 in the cross section of the bead core 6 in the width direction can be set to 0.52 times or more and 0.73 times or less the diameter D of the bead core 6. For example, when the diameter D of the bead core 6 is 0.96 mm, the minimum distance A can be set to 0.5 mm or more and 0.7 mm or less.
加硫成形時の良好なゴム流れを確保するには、最小間隔Ａが広いことが好ましい。しかし、最小間隔Ａが広くなり過ぎると、加硫成形によって得られた空気入りタイヤにおいて、ビードコア６全体としての剛性が低くなり、走行によって変形がしやすくなり、他モードの故障に対する耐久性が低下し得る。最小間隔Ａを、ビードコア６の直径Ｄの０．５２倍以上０．７３倍以下に設定することで、加硫成形時の良好なゴム流れと、加硫成形によって得られた空気入りタイヤにおけるビードコアの剛性確保とを両立できる。 In order to ensure a good rubber flow during vulcanization molding, it is preferable that the minimum distance A be wide. However, if the minimum distance A becomes too wide, in the pneumatic tire obtained by vulcanization molding, the rigidity of the entire bead core 6 becomes low, deformation becomes easy by running, and the durability against failure in other modes is lowered. It can. By setting the minimum distance A to at least 0.52 times and not more than 0.73 times the diameter D of the bead core 6, a good rubber flow at the time of vulcanization molding and a bead core in a pneumatic tire obtained by vulcanization molding And the rigidity of the
ビードコア６の幅方向の断面における、ビードコア６の径方向に互いに隣接する２本のビードワイヤ８間の最小間隔Ｂは、ビードコア６の直径Ｄの０．４１倍以上０．６３倍以下に設定できる。例えば、ビードコア６の直径Ｄが０．９６ｍｍの場合、最小間隔Ａは０．４ｍｍ以上０．６ｍｍ以下に設定できる。 The minimum distance B between two bead wires 8 adjacent to each other in the radial direction of the bead core 6 in the cross-section in the width direction of the bead core 6 can be set to 0.41 to 0.63 times the diameter D of the bead core 6. For example, when the diameter D of the bead core 6 is 0.96 mm, the minimum distance A can be set to 0.4 mm or more and 0.6 mm or less.
加硫成形時の良好なゴム流れを確保するには、最小間隔Ｂが広いことが好ましい。しかし、最小間隔Ｂが広くなり過ぎると、加硫成形によって得られた空気入りタイヤにおいて、ビードコア６全体としての剛性が低くなる。また、最小間隔Ｂが広くなり過ぎると、加硫成形によって得られた空気入りタイヤをリムに装着した際に、ビードコア６の径方向の外側に位置するビードワイヤ８はリムから離れたより大きな位置に配置されてしまう。かかる配置も、他モードの故障に対する耐久性の低下を生じ得る。最小間隔Ｂを、ビードコアＤの直径の０．４１倍以上０．６３倍以下に設定することで、加硫成形時の良好なゴム流れと、加硫成形によって得られた空気入りタイヤにおけるビードコアの剛性確保とを両立できる。 In order to ensure good rubber flow during vulcanization molding, it is preferable that the minimum distance B be wide. However, if the minimum distance B becomes too wide, the rigidity of the bead core 6 as a whole becomes low in the pneumatic tire obtained by vulcanization molding. In addition, when the minimum distance B becomes too wide, when the pneumatic tire obtained by vulcanization molding is attached to the rim, the bead wire 8 located on the radially outer side of the bead core 6 is disposed at a larger position away from the rim It will be done. Such an arrangement may also result in reduced durability to other modes of failure. By setting the minimum distance B to at least 0.41 times and not more than 0.63 times the diameter of the bead core D, a good rubber flow during vulcanization molding and a bead core in a pneumatic tire obtained by vulcanization molding can be obtained. It is compatible with securing rigidity.
ビードコア６の幅方向の断面における、ビードコア６の外形輪郭に最も隣接しているビードワイヤ８から外形輪郭６ａまでのビードコア６の幅方向の最短距離Ｃ、つまり幅方向端部の被覆ゴムの厚みは、最小間隔Ａの１／２を上回るように設定することが好ましい。
The shortest distance C in the width direction of the bead core 6 from the bead wire 8 closest to the outer contour of the bead core 6 to the
ビードコア６の外形輪郭６ａに最も隣接しているビードワイヤ８から外形輪郭６ａまでの最短距離Ｃを十分に確保することで、加硫成形時のゴム流れに起因するビードコア６の外形輪郭６ａに最も隣接しているビードワイヤ８とカーカスプライ５の接触を防止し、ビードコア６とカーカスプライ５の接着性を確保できる。
By securing the shortest distance C from the bead wire 8 closest to the
（評価試験）
比較例１，２及び実施例１，３のグリーンタイヤを加硫成形して製造した空気入りタイヤについて、ビードコアの耐久性の評価試験を行った。
(Evaluation test)
The evaluation test of the durability of a bead core was done about the pneumatic tire which manufactured by vulcanizing molding the green tire of comparative examples 1 and 2 and example 1, 3 and manufactured it.
比較例１，２及び実施例１，３のグリーンタイヤ１のビードコアに関する主な諸元は、後掲の表１の通りであった。表１に示したもの以外のビードコアに関する諸元は、比較例１，２及び実施例１，３で共通とした。特に、比較例１，２及び実施例１，３のいずれについても、ビードワイヤはビードコアの幅方向に８本、ビードコアの径方向に７本であった（図２参照）。 The main specifications of the bead cores of the green tires 1 of Comparative Examples 1 and 2 and Examples 1 and 3 are as shown in Table 1 below. The specifications regarding the bead core other than those shown in Table 1 are common to Comparative Examples 1 and 2 and Examples 1 and 3. In particular, in each of Comparative Examples 1 and 2 and Examples 1 and 3, the number of bead wires was 8 in the width direction of the bead core and 7 in the radial direction of the bead core (see FIG. 2).
評価方法としては、空気入りタイヤを２ｔフォークリフトに装着し、完全摩耗まで使用した。空気入りタイヤのサイズは７．００−１２で、リムサイズは１２×７．００、空気圧１０００ｋＰａであった。完全摩耗まで使用後のビードコアの故障の有無を確認した、以下の表１において、使用途中でビードコアの故障発生があった場合を「×」、使用後にビードコアに一部損傷があった場合を「△」、使用後にビードコアに損傷がない場合「〇」で示す。 As an evaluation method, a pneumatic tire was attached to a 2 t forklift and used until complete wear. The size of the pneumatic tire was 7.00-12, the rim size was 12 × 7.00, and the air pressure was 1000 kPa. In Table 1 below, it was confirmed that there was a failure of the bead core after use until the complete wear. In the case where there was a failure of the bead core in the middle of use "×", when the bead core was partially damaged after use " 」”, Indicated by “o” when there is no damage to the bead core after use.
ビードコア断面積に対する被覆ゴムの面積割合が、６５％以上７５％以下よりも低い比較例１，２（比較例１が５２％で、比較例２が５３％）については、使用途中でビードコアの故障発生があった。これに対して、ビードコア断面積に対する被覆ゴムの面積割合が、６５％以上７５％以下である実施例１，２（実施例１が６８％で、実施例２が６９％）については、使用途中でビードコアの故障発生はなかった。特に、最短距離Ｃ、つまり幅方向端部の被覆ゴムの厚みが、ビードコア６の幅方向に互いに隣接する２本のビードワイヤ８間の最小間隔Ａの１／２を上回っている実施例２については、使用後もビードコアに損傷は見られなかった。 For Comparative Examples 1 and 2 (52% for Comparative Example 1 and 53% for Comparative Example 2) in which the area ratio of the coated rubber to the bead core cross-sectional area is lower than 65% to 75%, failure of the bead core during use There was an outbreak. On the other hand, the area ratio of the coating rubber to the bead core cross-sectional area is 65% or more and 75% or less, and in the middle of use for Examples 1 and 2 (68% in Example 1, 69% in Example 2) There was no failure of the bead core. In particular, for Example 2 in which the shortest distance C, that is, the thickness of the covering rubber at the end in the width direction exceeds 1/2 of the minimum distance A between two bead wires 8 adjacent to each other in the width direction of the bead core 6 There was no damage to the bead core after use.
１ グリーンタイヤ
２ ケーシング
３ サイドウォール部
４ ビード部
５ カーカスプライ
６ ビードコア
６ａ 外形輪郭
６ｂ，６ｃ 長辺
６ｄ，６ｅ 短辺
７ ビードフィラー
８ ビードワイヤ
９ 被覆ゴム
１０ テープ状体
Reference Signs List 1 green tire 2 casing 3 side wall portion 4 bead portion 5 carcass ply 6
Claims (5)
前記ビードコアは、
前記ビードコアの幅方向の断面において、前記ビードコアの幅方向及び前記ビードコアの径方向に間隔をあけて配置された複数本のビードワイヤと、
前記複数本のビードワイヤ間に充填された被覆ゴムと
を備え、
前記ビードコアの幅方向の断面において、前記ビードコアの外形輪郭の断面積であるビードコア断面積に対する、前記被覆ゴムの面積割合が６５％以上７５％である、グリーンタイヤ。 A bead core located at the inner diameter end of the pair of side wall portions,
The bead core is
A plurality of bead wires arranged at intervals in the width direction of the bead core and in the radial direction of the bead core in a cross section in the width direction of the bead core;
Covering rubber filled between the plurality of bead wires;
The green tire whose area ratio of the covering rubber is 65% or more to the bead core cross-sectional area which is the cross-sectional area of the outline of the bead core in the cross section of the bead core in the width direction.
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| JP2017233251A JP7031096B2 (en) | 2017-12-05 | 2017-12-05 | Green tire |
| CN201811397047.0A CN110027366B (en) | 2017-12-05 | 2018-11-22 | Green tire |
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| JP2017233251A JP7031096B2 (en) | 2017-12-05 | 2017-12-05 | Green tire |
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| JP7031096B2 JP7031096B2 (en) | 2022-03-08 |
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| KR20130078576A (en) * | 2011-12-30 | 2013-07-10 | 한국타이어 주식회사 | Bead core made of wave type metal wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4137726C2 (en) * | 1990-11-16 | 1994-03-10 | Sumitomo Rubber Ind | Tire bead |
| CN100572110C (en) * | 2004-07-05 | 2009-12-23 | 住友电工钢线株式会社 | Annular concentrically twisted bead cord |
| AU2005246931B2 (en) * | 2004-12-30 | 2011-03-24 | The Goodyear Tire & Rubber Company | Pneumatic tire with high turnup, locked bead construction |
| JP2013103644A (en) * | 2011-11-15 | 2013-05-30 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| CN205273060U (en) * | 2016-01-08 | 2016-06-01 | 蚌埠伊诺华轮胎有限公司 | Novel folding tire |
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|---|---|---|---|---|
| GB1438441A (en) * | 1973-06-28 | 1976-06-09 | Pirelli | Bead core for a tyre |
| JPH04212606A (en) * | 1990-12-07 | 1992-08-04 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| JP2000198315A (en) * | 1998-12-28 | 2000-07-18 | Sumitomo Rubber Ind Ltd | Tire for motorcycle |
| JP2001329477A (en) * | 2000-05-18 | 2001-11-27 | Bridgestone Corp | Bead core and pneumatic tire equipped with the bead core |
| JP2005335584A (en) * | 2004-05-27 | 2005-12-08 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2010137637A (en) * | 2008-12-10 | 2010-06-24 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2012162204A (en) * | 2011-02-08 | 2012-08-30 | Bridgestone Corp | Pneumatic tire and method for manufacturing bead core |
| JP2013001312A (en) * | 2011-06-20 | 2013-01-07 | Bridgestone Corp | Bead ring and pneumatic tire with bead ring |
| KR20130078576A (en) * | 2011-12-30 | 2013-07-10 | 한국타이어 주식회사 | Bead core made of wave type metal wire |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110027366A (en) | 2019-07-19 |
| JP7031096B2 (en) | 2022-03-08 |
| CN110027366B (en) | 2021-04-13 |
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