WO2019230761A1 - Pneumatique - Google Patents

Pneumatique Download PDF

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Publication number
WO2019230761A1
WO2019230761A1 PCT/JP2019/021225 JP2019021225W WO2019230761A1 WO 2019230761 A1 WO2019230761 A1 WO 2019230761A1 JP 2019021225 W JP2019021225 W JP 2019021225W WO 2019230761 A1 WO2019230761 A1 WO 2019230761A1
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WO
WIPO (PCT)
Prior art keywords
tire
belt
resin member
resin
pneumatic tire
Prior art date
Application number
PCT/JP2019/021225
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English (en)
Japanese (ja)
Inventor
誓志 今
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 WO2019230761A1 publication Critical patent/WO2019230761A1/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
    • 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
    • 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.
  • a belt is usually disposed outside the carcass in the tire radial direction in order to improve tire performance (for example, Patent Document 1).
  • a belt in which a resin-coated cord or a rubber-coated cord is spirally wound in the tire circumferential direction has almost no binding force in the tire width direction, and is therefore weak against input by protrusions or the like. was there.
  • an object of the present invention is to provide a pneumatic tire having excellent protrusion penetration resistance.
  • the gist configuration of the present invention is as follows.
  • the pneumatic tire of the present invention includes a belt in which a cord covered with a coating material is spirally wound in the tire circumferential direction, and a resin member disposed on the outer side or the inner side of the belt in the tire radial direction. And fibers oriented in a predetermined direction inclined with respect to the tire circumferential direction are arranged in the resin member.
  • FIG. 1 is a schematic cross-sectional view in the tire width direction showing a pneumatic tire according to an embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional view in the tire width direction showing a pneumatic tire according to an embodiment of the present invention.
  • the pneumatic tire 1 of the present embodiment (hereinafter also simply referred to as a tire) includes a carcass 3 straddling a bead core 2 a embedded in a pair of bead portions 2 in a toroidal shape.
  • the tire 1 includes a belt 4 and a tread 5 in this order on the outer side in the tire radial direction of the crown portion of the carcass 3.
  • the tire 1 of the present embodiment has the same configuration between the half portions in the tire width direction with the tire equatorial plane CL as a boundary, but may be asymmetrical. .
  • the tire 1 of the present embodiment has a bead core 2a in which steel cords are bundled.
  • the material and shape of the bead core are not particularly limited, or may have a structure without the bead core 2a.
  • the carcass 3 is comprised by the one carcass ply consisting of organic fiber, the material and the number of carcass plies are not particularly limited.
  • the belt 4 is a spiral belt in a state in which a rubber-coated cord in which a cord 4b is coated with a coating rubber 4a is spirally wound around a tire axis.
  • the belt 4 is preferably a single layer. It is because it is preferable from a viewpoint of weight reduction.
  • the width of the belt 4 in the tire width direction can be, for example, 90 to 120% of the tire ground contact width.
  • the thickness (maximum thickness) of the belt 4 is not particularly limited, but may be, for example, 0.3 to 3.5 mm.
  • the cord 4b any known material can be used, for example, a steel cord can be used.
  • the steel cord can be made of, for example, steel monofilament or stranded wire.
  • the cord 4b can also use organic fiber, carbon fiber, or the like.
  • nylon or the like can be used as the organic fiber, and a single fiber or a plurality of single fibers twisted together can be used.
  • the covering rubber 4a can be made of any known rubber material such as a rubber material usually used for belt coating rubber.
  • tire contact width means that the tire is applied to the outermost position in the tire width direction of the contact surface when the tire is mounted on the applicable rim, filled with the specified internal pressure, and the maximum load is applied. Mounted on the rim, filled with the specified internal pressure, and defined as the distance in the tire width direction between the ground contact edges in a no-load state. In addition, other dimensions in the present specification are measured in a state in which a tire is mounted on an applicable rim, filled with a specified internal pressure, and in a no-load state.
  • appcable rim is an industrial standard effective in the region where tires are produced and used.
  • JATMA Joint Automobile Tire Association
  • JATMA YEAR BOOK and in Europe, ETRTO (The European) Tire and Rim Technical Organization's STANDARDDS MANUAL, in the United States TRA (The Tire and Rim Association, Inc.) YEAR BOOK, etc.
  • Standard rim (ETRTOSTANDAND in the applicable size to be described in the future) Refers to Measuring Rim, TRA's YEAR BOOK, Design Rim) (ie, “Rim” above) In addition to the current size, it includes the size that can be included in the above industrial standards in the future.As an example of “future size to be described”, it is described as “FUTURE DEVELOPMENTS” in ETRTO STANDARDDS MANUAL 2013 edition. However, in the case of a size not described in the industry standard, it means a rim having a width corresponding to the tire bead width.
  • the “specified internal pressure” refers to an air pressure (maximum air pressure) corresponding to the tire maximum load capacity of the standard such as JATMA in a tire of an applicable size. In the case of a size not described in the industry standard, the “specified internal pressure” refers to an air pressure (maximum air pressure) corresponding to a maximum load capacity specified for each vehicle on which a tire is mounted. “Maximum load load” is the tire maximum load capacity of the standard such as JATMA for the tire of the applicable size, or, in the case of a size not described in the industry standard, the maximum load capacity defined for each vehicle on which the tire is mounted. Means the load corresponding to.
  • the belt 4 may be a spiral belt in which a cord 4b covered with a coating resin 4a that is a coating material is spirally wound in the tire circumferential direction.
  • the belt 4 is preferably a single layer. It is because it is preferable from a viewpoint of weight reduction.
  • the width of the belt 4 in the tire width direction can be, for example, 90 to 120% of the tire ground contact width.
  • the thickness (maximum thickness) of the belt 4 is not particularly limited, but may be, for example, 0.3 to 3.5 mm. In this case as well, any known material can be used for the cord 4b. For example, a steel cord can be used.
  • the steel cord can be made of, for example, steel monofilament or stranded wire.
  • the cord 4b can also use organic fiber, carbon fiber, or the like.
  • nylon or the like can be used as the organic fiber, and a single fiber or a plurality of single fibers twisted together can be used.
  • the coating resin 4a for example, a thermoplastic elastomer or a thermoplastic resin can be used, and a resin that is cross-linked by heat or an electron beam or a resin that is cured by thermal dislocation can also be used.
  • thermoplastic elastomers polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), polyester-based thermoplastic elastomer (TPC) And dynamic crosslinkable thermoplastic elastomer (TPV).
  • TPO polyolefin-based thermoplastic elastomer
  • TPS polystyrene-based thermoplastic elastomer
  • TPA polyamide-based thermoplastic elastomer
  • TPU polyurethane-based thermoplastic elastomer
  • TPC polyester-based thermoplastic elastomer
  • TPV dynamic crosslinkable thermoplastic elastomer
  • thermoplastic resin include polyurethane resin, polyolefin resin, vinyl chloride resin, polyamide resin and the like.
  • the deflection temperature under load (at the time of 0.45 MPa load) specified in ISO75-2 or ASTM D648 is 78 ° C or more, and the tensile yield strength specified in JIS K7113 is used.
  • a material having a tensile breaking elongation of 50% or more as defined in JIS K7113 and a Vicat softening temperature (Method A) as defined in JIS K7206 of 130 ° C. or more can be used.
  • the tensile elastic modulus (specified in JIS K7113: 1995) of the coating resin 4a that covers the cord 4b is preferably 50 MPa or more.
  • the tensile modulus of the coating resin 4a that covers the cord 4b is preferably 1000 MPa or less.
  • the coating resin 4a here does not include rubber (an organic polymer substance exhibiting rubber elasticity at room temperature).
  • the resin-coated cord can be formed, for example, by coating a molten coating resin 4a on the outer peripheral side of the cord 4b and solidifying by cooling.
  • the tire 1 includes a resin member 6 that continuously extends in the tire width direction, which is plate-shaped in this example, on the inner side in the tire radial direction of the belt 4.
  • the resin member 6 is disposed on the inner side in the tire radial direction of the belt 4, but the resin member 6 may be disposed on the outer side in the tire radial direction of the belt 4.
  • the width of the resin member 6 in the tire width direction is larger than the width of the belt 4 in the tire width direction, but may be the same or smaller.
  • the width of the resin member 6 in the tire width direction can be, for example, 80 to 130% of the tire ground contact width.
  • the resin of the resin member 6 can be the same type of resin as the case where the coating material 4b of the belt cord 4a is a resin, but a different type of resin can also be used.
  • short fibers oriented in a predetermined direction inclined with respect to the tire circumferential direction are arranged in the resin member 6.
  • the predetermined direction can be ⁇ 80 ° or less with respect to the tire width direction, preferably ⁇ 45 ° or less, particularly preferably ⁇ 20 ° or less, and ⁇ 10 ° or less. It is most preferable (in this embodiment, the direction is a direction inclined at ⁇ 20 ° or less with respect to the tire width direction).
  • the short fibers can be oriented in the injection or extrusion direction by injecting or extruding a molten resin containing the short fibers.
  • the short fiber an organic short fiber or an inorganic short fiber can be used as the short fiber.
  • the organic short fiber examples include polyamide-based, polyester-based, polyolefin-based, polyvinyl alcohol-based, and cellulose-based short fibers.
  • short fibers such as iron, copper, aluminum, and carbon can be used as the inorganic short fibers. These short fibers may be used individually by 1 type, and 2 or more types may be mixed and used for them.
  • the fibers (short fibers) extend at an angle of 10 ° or less with the “predetermined direction”.
  • the rigidity of the belt 4 can be sufficiently reinforced and enhanced, and the steering stability and the like can be improved. Furthermore, in the pneumatic tire of the present embodiment, since the short fibers oriented in a predetermined direction inclined with respect to the tire circumferential direction are arranged in the resin member 6, the rigidity in the tire width direction of the resin member 6 is increased. The resin member 6 bears the tensile force in the tire width direction that occurs when the protrusion penetrates, and thus the protrusion penetration resistance can be improved.
  • the short fibers are oriented in a direction inclined at an angle of ⁇ 20 ° or less with respect to the tire width direction, the rigidity and the rigidity in the tire width direction are particularly enhanced to effectively obtain the above-described effects. be able to. Further, the tensile force in the tire width direction is more intense on the inner side in the tire radial direction.
  • the resin member 6 is disposed on the inner side in the tire radial direction of the belt 4, so that the tire can be more effectively used. The resin member 6 can bear the tensile force in the width direction.
  • the protrusion penetration resistance can be improved.
  • a short fiber having a length of 10 mm or less as the fiber as in the above embodiment. This is because the longer the fiber length, the better the impact strength, but the fiber bundle remains at the time of molding and the problem of dispersibility remains.
  • a long fiber having a length of more than 10 mm can be used.
  • the covering material 4a of the cord 4b of the belt 4 is preferably rubber. It is because it is excellent in manufacturability. Further, when the coating material 4a is rubber, the protrusion penetration resistance can be effectively obtained.
  • the covering material 4a of the cord 4b of the belt 4 is preferably made of resin. This is because the resin has higher rigidity than the weight.
  • the predetermined direction inclined with respect to the tire circumferential direction is preferably ⁇ 20 ° or less, and most preferably ⁇ 10 ° or less with respect to the tire width direction. This is because the rigidity in the tire width direction of the resin member 6 can be further improved.
  • the resin member 6 is preferably arranged on the inner side in the tire radial direction of the belt 4.
  • the resin member 6 having oriented short fibers in a place where the tensile force in the tire width direction is more strongly generated, the resin member 6 bears the tensile force in the tire width direction more effectively, This is because the protrusion penetration resistance can be effectively improved.
  • the fiber (short fiber) content in the resin member 6 is preferably in the range of 0.1 to 45% by weight.
  • the content of the fiber (short fiber) 0.1% by weight or more, the above-mentioned reinforcing effect by the fiber (short fiber) can be more reliably exhibited, while the content of the fiber (short fiber) is included. This is because when the amount is 45% by weight or less, deterioration of ride comfort can be prevented.
  • the fibers are preferably arranged uniformly throughout the resin member 6 within the above-described content range, for example, but a part of the resin member 6 (for example, the tire width direction) It may be arranged only in the central part or one end part or both end parts in the tire width direction).
  • the length of the short fiber is preferably 0.01 mm or more in order to obtain the effect of the above orientation more reliably.
  • an inorganic short fiber particularly a metal short fiber
  • the coating layer is preferably an arbitrary adhesive layer having adhesiveness between the resin and the short metal fibers. By providing such a coating layer, it is also possible to suppress a decrease in durability of the resin member 6 due to contact between short fibers during production or the like.
  • the resin member 6 is disposed on the inner side in the tire radial direction of the belt 4, but may be disposed on the outer side in the tire radial direction of the belt 4.
  • the width of the resin member 6 in the tire width direction is larger than the width of the belt 4 in the tire width direction, but the width of the resin member 6 in the tire width direction is the tire width of the belt 4. It may be smaller than the width in the direction or may be substantially the same width. Further, the thickness of the resin member 6 can be made larger, substantially the same or smaller than the thickness of the belt 4. In the embodiment shown in FIG.
  • the resin member 6 is a plate-like member extending continuously in the tire width direction, but the resin member 6 is intermittent in the tire width direction (for example, intermittent). It may be a plate-like one extending in general.
  • the circumferential main grooves 8 (four in the illustrated example) continuously extending in the tire circumferential direction are provided, but the number of the circumferential main grooves 8 is particularly limited. Alternatively, the circumferential main groove 8 may not be provided.

Abstract

Ce bandage pneumatique est pourvu d'une courroie dans laquelle un câble revêtu d'un matériau de revêtement est enroulé en hélice dans la direction circonférentielle du pneu, et d'un élément en résine qui est disposé à l'extérieur ou à l'intérieur de la courroie dans la direction radiale du pneu. Des fibres orientées dans une direction prédéfinie qui est inclinée par rapport à la direction circonférentielle du pneu sont agencées dans l'élément en résine.
PCT/JP2019/021225 2018-05-31 2019-05-29 Pneumatique WO2019230761A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018105584A JP2019209761A (ja) 2018-05-31 2018-05-31 空気入りタイヤ
JP2018-105584 2018-05-31

Publications (1)

Publication Number Publication Date
WO2019230761A1 true WO2019230761A1 (fr) 2019-12-05

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WO (1) WO2019230761A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002154307A (ja) * 2000-11-21 2002-05-28 Bridgestone Corp 複合強化ゴム材および空気入りタイヤ
JP2002160506A (ja) * 2000-11-27 2002-06-04 Bridgestone Corp 空気入りタイヤ
JP2002187408A (ja) * 2000-12-22 2002-07-02 Bridgestone Corp 複合強化ゴム材およびその製造方法ならびに空気入りタイヤ
JP2004123019A (ja) * 2002-10-04 2004-04-22 Sumitomo Rubber Ind Ltd 空気入りタイヤ
US20100282392A1 (en) * 2007-10-05 2010-11-11 Societe De Technologie Michelin Tire using a Reinforcing Structure with Fibres of Flattened Cross Section
US20120090755A1 (en) * 2009-04-09 2012-04-19 Michelin Recherche Et Technique S.A. Tire With Radial Carcass Reinforcement
JP2017001602A (ja) * 2015-06-15 2017-01-05 住友ゴム工業株式会社 非空気式タイヤ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002154307A (ja) * 2000-11-21 2002-05-28 Bridgestone Corp 複合強化ゴム材および空気入りタイヤ
JP2002160506A (ja) * 2000-11-27 2002-06-04 Bridgestone Corp 空気入りタイヤ
JP2002187408A (ja) * 2000-12-22 2002-07-02 Bridgestone Corp 複合強化ゴム材およびその製造方法ならびに空気入りタイヤ
JP2004123019A (ja) * 2002-10-04 2004-04-22 Sumitomo Rubber Ind Ltd 空気入りタイヤ
US20100282392A1 (en) * 2007-10-05 2010-11-11 Societe De Technologie Michelin Tire using a Reinforcing Structure with Fibres of Flattened Cross Section
US20120090755A1 (en) * 2009-04-09 2012-04-19 Michelin Recherche Et Technique S.A. Tire With Radial Carcass Reinforcement
JP2017001602A (ja) * 2015-06-15 2017-01-05 住友ゴム工業株式会社 非空気式タイヤ

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