WO2019244739A1 - Bandage pneumatique - Google Patents

Bandage pneumatique Download PDF

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Publication number
WO2019244739A1
WO2019244739A1 PCT/JP2019/023261 JP2019023261W WO2019244739A1 WO 2019244739 A1 WO2019244739 A1 WO 2019244739A1 JP 2019023261 W JP2019023261 W JP 2019023261W WO 2019244739 A1 WO2019244739 A1 WO 2019244739A1
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WO
WIPO (PCT)
Prior art keywords
tire
resin
layer
fiber
reinforcing
Prior art date
Application number
PCT/JP2019/023261
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English (en)
Japanese (ja)
Inventor
崇之 藏田
Original Assignee
株式会社ブリヂストン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 WO2019244739A1 publication Critical patent/WO2019244739A1/fr

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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
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • 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
    • 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
    • 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 pneumatic tire provided with a belt layer.
  • a pneumatic tire to be mounted on an automobile includes two or more inclined belt plies including a cord inclined with respect to the tire circumferential direction on the outer side in the tire radial direction of the carcass, and a belt including a reinforcing layer and the like.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2013-244930
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2013-220743
  • Patent Documents 1 and 2 have two or more inclined belt plies to secure in-plane shear rigidity. However, since the number of plies and reinforcing layers is large, it is difficult to reduce the weight of the tires. It has become.
  • the present invention has been made in consideration of the above-described circumstances, and has as its object to provide a pneumatic tire that ensures both in-plane shear rigidity of a belt and weight reduction of the tire.
  • the pneumatic tire according to the first aspect includes a pair of bead cores, a carcass formed over the pair of bead cores, and an annular resin body formed of a resin arranged outside the carcass in a tire radial direction, and A belt layer having a reinforcing cord extending in the tire circumferential direction and arranged at intervals in the tire width direction and embedded in the resin main body; and the belt on at least one of a tire radial outer surface and an inner surface of the belt layer.
  • the belt is disposed on at least a part of the outer half of the belt in the tire width direction from the tire equatorial plane of the layer to the outer end in the tire width direction, at least partially within a range, and the extending direction intersects with the reinforcing cord, and And a fiber reinforcing layer having interlaced fiber cords that intersect while being inclined in directions opposite to each other with respect to the extending direction.
  • the pneumatic tire according to the first aspect includes a resin body and a belt layer having a reinforcing cord embedded in the resin body outside the carcass in the tire radial direction.
  • the reinforcing cords extend in the tire circumferential direction and are arranged at intervals in the tire width direction.
  • the fiber reinforcing layer is arranged in the range of / 3.
  • the fiber reinforcing layer has intersecting fiber cords in which the extending direction intersects with the reinforcing cord and crosses while being inclined in directions opposite to each other with respect to the extending direction of the reinforcing cord.
  • the fiber reinforcing layer is wider in the tire width direction than the pitch between the reinforcing cords in the tire width direction.
  • the fiber reinforcing layer is disposed across the reinforcing cords adjacent in the tire width direction, cracks between the reinforcing cords can be effectively suppressed.
  • the fiber reinforcing layer is disposed radially inside the belt layer in the tire radial direction.
  • the distortion of the resin main body is alleviated, and the crack can be suppressed.
  • the fiber reinforcing layer is disposed radially outside the belt layer in the tire radial direction.
  • the distortion of the resin main body is alleviated, and the crack can be suppressed.
  • the pneumatic tire of the present invention it is possible to ensure both in-plane shear rigidity and weight reduction of the tire.
  • FIG. 2 is a partial cross-sectional view illustrating a resin annular belt in the pneumatic tire according to the embodiment.
  • FIG. 2 is a partially cutaway view of a resin annular belt and a fiber reinforcing layer in the pneumatic tire according to the present embodiment when viewed in plan.
  • FIG. 1 shows a pneumatic tire 10 according to an embodiment of the present invention.
  • the pneumatic tire 10 shows a radial tire as an example.
  • arrow W indicates the tire width direction
  • arrow R indicates the tire radial direction.
  • the tire width direction refers to a direction parallel to the rotation axis of the pneumatic tire 10.
  • the tire radial direction refers to a direction orthogonal to the rotation axis of the pneumatic tire 10.
  • Reference symbol CL indicates the equatorial plane of the tire 10 (tire equatorial plane).
  • the grounding end E of the tread 22 and the grounding width TW mean that the pneumatic tire 10 is mounted on a standard rim specified in JATMA YEAR BOOK (2018 edition, Japan Automobile Tire Association Standard). Then, it is filled with 100% internal pressure of the air pressure (maximum air pressure) corresponding to the maximum load capacity (bold load in the internal pressure-load capacity correspondence table) in the applicable size ply rating in JATMA YEAR BOOK, This is one in which the rotation axis is arranged parallel to the flat plate and a mass corresponding to the maximum load capacity is added.
  • the TRA standard and the ETRTO standard are applied at the place of use or the place of manufacture, the respective standards are followed.
  • the pneumatic tire 10 includes a pair of bead portions 12 in which a bead core 12A is embedded, a pair of side portions 14 extending from the pair of bead portions 12 outward in the tire radial direction, and a crown portion 16 extending from the side portions 14 inward in the tire width direction. ,have.
  • a carcass 18 composed of one carcass ply 18A straddles between one bead portion 12 and the other bead portion 12.
  • An inner liner 26 made of rubber is arranged inside the tire of the carcass 18.
  • a side rubber layer 24 is disposed outside the carcass 18 in the tire width direction.
  • a resin annular belt 20 is provided on the crown portion 16 on the outside of the carcass 18 in the tire radial direction.
  • the resin annular belt 20 has an annular shape. The details of the resin annular belt 20 will be described later.
  • a tread 22 is disposed outside the resin annular belt 20 in the tire radial direction.
  • the tread 22 has a plurality of main grooves 22A formed along the tire circumferential direction.
  • the resin annular belt 20 has a reinforcing cord 20A spirally wound in the tire circumferential direction, and a resin body 20B of a resin material covering the reinforcing cord 20A.
  • the spacing between the reinforcing cords 20A is a pitch P (see FIGS. 3A and 3B).
  • the resin annular belt 20 can be formed of a ring-shaped hoop in which a resin-coated cord 20C in which a reinforcing cord 20A is coated with a resin main body 20B is spirally wound and integrated.
  • one resin-coated cord 20C is spirally wound in the tire circumferential direction to form the resin annular belt 20, but a reinforcing cord 20A extending along the tire circumferential direction in another configuration is used. It may be embedded in the resin body 20B.
  • the resin-coated cord 20C may be formed in a ring shape, and a plurality of ring-shaped resin-coated cords 20C may be formed side by side in the tire width direction.
  • the resin-coated cord 20C is wound at an angle of 5 ° or less with respect to the tire circumferential direction.
  • a resin material having a higher tensile modulus than the rubber material forming the side rubber layer 24 and the rubber material forming the tread 22 is used for the resin body 20B.
  • the tensile modulus of the resin body 20B (defined in JIS K7113: 1995) is preferably 100 MPa or more.
  • the upper limit of the tensile modulus of the resin main body 20B is preferably set to 1000 MPa or less.
  • the tensile modulus of the resin body 20B is particularly preferably in the range of 200 to 700 MPa.
  • Examples of the material of the resin body 20B include general-purpose resins such as thermoplastic resins, thermoplastic elastomers, thermosetting resins, and (meth) acrylic resins, EVA resins, vinyl chloride resins, fluorine resins, and silicone resins.
  • general-purpose resins such as thermoplastic resins, thermoplastic elastomers, thermosetting resins, and (meth) acrylic resins, EVA resins, vinyl chloride resins, fluorine resins, and silicone resins.
  • engineering plastics including super engineering plastics
  • the resin material here does not include vulcanized rubber.
  • thermoplastic resin refers to a polymer compound in which a material softens and flows with an increase in temperature and becomes relatively hard and strong when cooled.
  • the material softens and flows with an increase in temperature, becomes a relatively hard and strong state when cooled, and a polymer compound having rubber-like elasticity is made into a thermoplastic elastomer, and the material with the increase in temperature becomes a material.
  • thermoplastic resins include polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), and polyester Thermoplastic elastomer (TPC), dynamically crosslinked thermoplastic elastomer (TPV), polyolefin thermoplastic resin, polystyrene thermoplastic resin, polyamide thermoplastic resin, polyester thermoplastic resin, etc. No.
  • Thermosetting resin refers to a polymer compound that forms a three-dimensional network structure with a rise in temperature and cures, and examples thereof include a phenol resin, an epoxy resin, a melamine resin, and a urea resin.
  • the reinforcement cord 20A is a steel cord.
  • the steel cord is mainly composed of steel, and can contain various trace contents such as carbon, manganese, silicon, phosphorus, sulfur, copper, and chromium.
  • the resin annular belt 20 has an outer diameter at a central portion in the tire width direction larger than outer diameters at both end portions in the tire width direction, and when viewed in a cross section along the tire axis, the central portion in the tire width direction has a tire radial direction.
  • the shape is a gentle arc that protrudes outward.
  • the present invention is not limited thereto, and the resin annular belt 20 may be formed to have a constant diameter and a constant thickness, and may be formed in a straight line when viewed in a cross section along the tire axis.
  • the width BW of the resin annular belt 20 is preferably 75% or more and 110% or less with respect to the contact width TW (distance between the contact ends E) of the tread 22 measured along the tire axial direction.
  • a fiber reinforcement layer 32 is disposed outside and inside the resin annular belt 20 in the tire radial direction. Assuming that the range of 1/3 of the outer side in the tire width direction in the belt half width BW / 2 from the tire equatorial plane CL of the resin annular belt 20 to the outer end in the tire radial direction is the “reinforcement required range SR”, the fiber reinforcement layer 32 It is arranged at least in the reinforcement required range SR. The reinforcement required range SR exists at both ends in the tire width direction. In the present embodiment, the fiber reinforcement layer 32 is disposed in the entire reinforcement range SR.
  • the fiber reinforcing layer 32 is formed by using a plurality of fiber cords 32B (for example, organic fiber cords such as nylon (registered trademark) / aliphatic polyamide) that are arranged in parallel with each other with rubber.
  • the fiber sheet 32A formed by coating is formed by laminating two sheets.
  • the side closer to the resin annular belt 20 is referred to as a fiber sheet 32A-1
  • the side farther from the resin annular belt 20 is referred to as a fiber sheet 32A-2.
  • a woven fabric can be used as the fiber sheet 32A, for example, a bead protection member can be used.
  • the fiber cords 32B-1 and 32B-2 of the fiber sheets 32A-1 and 32A-2 are inclined in directions opposite to each other with respect to the extending direction of the reinforcement cord 20A, and intersect with the reinforcement cord 20A. It is arranged to become.
  • the crossed fiber cord of the present invention is formed by the fiber cords 32B-1 and 32B-2 of the two fiber sheets 32A-1 and 32A-2. Assuming that the inclination angles of the fiber cords 32B-1 and 32B-2 with respect to the tire circumferential direction are ⁇ 1 and ⁇ 2, it is preferable that ⁇ 1 and ⁇ 2 be 45 ° or more and 90 ° or less.
  • the fiber reinforcement layer 32 is formed of a single fiber sheet via the tire width direction end surface and includes a reinforcing range SR inside the resin annular belt 20 in the tire radial direction and a material outside the tire radial direction. It is arranged so as to cover both reinforcement areas SR.
  • the fiber reinforcement layer 32 is adhered to the resin annular belt 20 by an adhesive and a vulcanization process.
  • the fiber reinforcement layer 32 is not limited to the above arrangement, and may be formed by covering the tire radial inner side and the outer side of the resin annular belt 20 with separate fiber sheets as shown in FIG. 4B. Good.
  • the fiber reinforcing layer 32 may be formed by covering both ends of the resin annular belt 20 in the tire width direction with one fiber sheet 32A.
  • the resin annular belt 20 may be disposed so as to cover all of the inside and outside in the tire radial direction, or as shown in FIG.
  • the fiber reinforcement layer 32 may be formed from one required reinforcing range SR to the required radially inner reinforcing range SR on the other side through the tire radial direction outside.
  • the fiber reinforcing layer 32 is formed from one radially outer required reinforcing range SR on the tire radially outer side to the tire radially outer required range SR on the other side via the tire radially inner side. May be.
  • the fiber reinforcing layer 32 may be arranged only on the outer side in the tire radial direction of the required reinforcement range SR of the resin annular belt 20, or as shown in FIG.
  • the fiber reinforcement layer 32 may be arranged only inside the tire radial direction within the required reinforcement range SR.
  • the fiber reinforcement layer 32 may be arranged only on the entire surface of the resin annular belt 20 outside in the tire radial direction, or as shown in FIG.
  • the fiber reinforcement layer 32 may be arranged on the entire surface only inside.
  • the fiber reinforcement layer 32 is arranged so as to cover the entire reinforcement range SR, but the fiber reinforcement layer 32 may be arranged in a part of the reinforcement range SR in the tire width direction.
  • the width of the fiber reinforcing layer 32 in the tire width direction is preferably wider than the pitch P between the reinforcing cords 20A.
  • the crown portion 16 of the carcass 18 is reinforced by the resin annular belt 20.
  • the resin annular belt 20 is formed by covering a reinforcing cord 20A spirally wound with a resin body 20B. Therefore, a higher in-plane shear rigidity can be obtained as compared with a belt in which rubber is disposed between the reinforcing cords. Further, the weight of the tire can be reduced.
  • the resin annular belt 20 secures out-of-plane bending rigidity, and when a large lateral force is applied to the pneumatic tire 10, buckling of the tread 22 (the surface of the tread 22 is wavy and a part of the tread 22 is separated from the road surface). Phenomenon).
  • Fiber reinforced layer 32 is arranged in required reinforcement range SR of resin annular belt 20. Since the fiber reinforcing layer 32 is arranged so that the extending direction of the fiber cords intersects the reinforcing cords 20A, the distortion of the surface of the resin annular belt 20 can be reduced, and the reinforcing cords 20A of the resin main body 20B can be formed. The generation of cracks along the cracks and the propagation of cracks can be suppressed.
  • the fiber reinforcing layer 32 is formed by superposing two fiber sheets 32A to form an intersecting layer.
  • the fiber reinforcing layer 32 is fiber-reinforced by using a single-layer fiber sheet formed by covering the intersecting fiber cord with rubber. The layer 32 may be used.

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

Abstract

L'invention concerne un bandage pneumatique (10) équipé : d'une paire de tringles (12A) ; d'une carcasse (18) formée de manière à couvrir l'intervalle entre la paire de tringles (12A) ; d'une couche de ceinture qui présente un corps principal de résine annulaire (12B) formé à partir d'une résine et positionné à l'extérieur de la carcasse (18) dans la direction radiale du pneu, et des câbles de renfort (12A) qui s'étendent dans la direction circonférentielle du pneu et qui sont incorporés dans le corps principal de résine (12B), des intervalles étant intercalés entre ces derniers dans le sens de la largeur du pneu ; et d'une couche de renfort fibreuse (32) qui est positionnée sur la surface externe et/ou interne de la couche de ceinture dans la direction radiale du pneu dans au moins une partie de la plage constituant l'extérieur 1/3, dans le sens de la largeur du pneu, de la demi-largeur de ceinture du plan équatorial du pneu de la couche de ceinture à son au bord externe dans le sens de la largeur du pneu, et présentant des câbles de fibre traversants qui s'étendent dans une direction qui coupe les câbles de renfort (12A), et croisent la direction d'extension de câble de renfort (12A) par une inclinaison dans des directions opposées l'une par rapport à l'autre.
PCT/JP2019/023261 2018-06-18 2019-06-12 Bandage pneumatique WO2019244739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018115413A JP2021154753A (ja) 2018-06-18 2018-06-18 空気入りタイヤ
JP2018-115413 2018-06-18

Publications (1)

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WO2019244739A1 true WO2019244739A1 (fr) 2019-12-26

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PCT/JP2019/023261 WO2019244739A1 (fr) 2018-06-18 2019-06-12 Bandage pneumatique

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WO (1) WO2019244739A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6260593B1 (en) * 1998-08-04 2001-07-17 Bridgestone/Firestone Research, Inc. Race tire containing band element
JP2007069745A (ja) * 2005-09-07 2007-03-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2007106152A (ja) * 2005-10-11 2007-04-26 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2012035681A (ja) * 2010-08-04 2012-02-23 Bridgestone Corp 空気入りタイヤ
WO2017200064A1 (fr) * 2016-05-20 2017-11-23 株式会社ブリヂストン Pneumatique
JP2018197072A (ja) * 2017-05-24 2018-12-13 株式会社ブリヂストン 空気入りタイヤ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6260593B1 (en) * 1998-08-04 2001-07-17 Bridgestone/Firestone Research, Inc. Race tire containing band element
JP2007069745A (ja) * 2005-09-07 2007-03-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2007106152A (ja) * 2005-10-11 2007-04-26 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2012035681A (ja) * 2010-08-04 2012-02-23 Bridgestone Corp 空気入りタイヤ
WO2017200064A1 (fr) * 2016-05-20 2017-11-23 株式会社ブリヂストン Pneumatique
JP2018197072A (ja) * 2017-05-24 2018-12-13 株式会社ブリヂストン 空気入りタイヤ

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