WO2019239895A1 - Pneu - Google Patents

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Publication number
WO2019239895A1
WO2019239895A1 PCT/JP2019/021328 JP2019021328W WO2019239895A1 WO 2019239895 A1 WO2019239895 A1 WO 2019239895A1 JP 2019021328 W JP2019021328 W JP 2019021328W WO 2019239895 A1 WO2019239895 A1 WO 2019239895A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
layer
tire
resin
pneumatic tire
Prior art date
Application number
PCT/JP2019/021328
Other languages
English (en)
Japanese (ja)
Inventor
福島　敦
正之 有馬
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 WO2019239895A1 publication Critical patent/WO2019239895A1/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
    • 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 disclosure relates to a pneumatic tire having a belt provided with a resin layer.
  • pneumatic tires to be mounted on automobiles there are pneumatic tires including a belt configured to include a resin layer on the outer side in the tire radial direction of the carcass (for example, JP 2007-069745 A, JP 2002-002220 A). (Publication)
  • a reinforcing layer called a layer is provided so as to cover the end of the belt, but the resin layer of the belt covered with the layer may crack due to the effect of the layer.
  • the present disclosure is intended to provide a pneumatic tire that can suppress the occurrence of cracks in the resin layer of the belt in consideration of the above facts.
  • a pneumatic tire according to the present disclosure includes a carcass straddling one bead portion to the other bead portion, a belt that is disposed on the outer side in the tire radial direction of the carcass and includes at least a resin layer, and at least the tire of the belt A layer covering an end portion in the width direction; and a buffer layer disposed between the carcass and the layer.
  • the buffer layer is provided between the layer and the belt, the force from the layer can be buffered by the buffer layer, and the occurrence of cracks in the resin layer of the belt is suppressed. I can do it.
  • the carcass ply 14 is formed by coating a plurality of cords (not shown) extending in the radial direction of the pneumatic tire 10 with a coating rubber (not shown). That is, the pneumatic tire 10 of the present embodiment is a so-called radial pneumatic tire.
  • the material of the cord of the carcass ply 14 is, for example, PET, but may be another conventionally known material.
  • the end portion of the carcass ply 14 in the tire width direction is folded back from the bead core 12 in the tire radial direction.
  • a portion extending from one bead core 12 to the other bead core 12 is called a main body portion 14 ⁇ / b> A
  • a portion folded from the bead core 12 is called a folded portion 14 ⁇ / b> B.
  • the cross-sectional shape of the main body portion 14A of the carcass ply 14 in the pneumatic tire 10 of the present embodiment is the same cross-sectional shape as that of a conventional general pneumatic tire, and the vicinity of the tire equatorial plane CL has a substantially constant radius and a flat shape. Yes, the radius gradually decreases near the shoulder.
  • a bead filler 18 whose thickness gradually decreases from the bead core 12 toward the outer side in the tire radial direction is disposed.
  • a bead portion 20 is a portion on the inner side in the tire radial direction from the tire radial direction outer end 18A of the bead filler 18.
  • An inner liner 22 made of rubber is disposed inside the pneumatic tire of the carcass 16.
  • a side rubber layer 24A is disposed on the outer side in the tire radial direction
  • a side rubber layer 24B is disposed on the inner side in the tire radial direction. Note that a part of the side rubber layer 24 ⁇ / b> B is folded back on the radially inner side of the bead core 12 and extends to a part of the tire inner surface.
  • a tire case 25 is configured by the bead core 12, the carcass 16, the bead filler 18, the inner liner 22, the side rubber layer 24A, and the side rubber layer 24B.
  • the tire case 25 is a pneumatic tire frame member that forms the frame of the pneumatic tire 10.
  • a belt 26 is provided on the outer side of the crown portion of the carcass 16, in other words, on the outer side in the tire radial direction of the carcass 16 to restrain the outer peripheral portion of the carcass 16 to obtain a tag effect.
  • the belt 26 of the present embodiment is formed substantially flat when viewed in a cross section along the rotation axis. In other words, the central portion in the tire width direction is formed in a straight line parallel to the tire rotation axis. However, both end portions in the tire width direction are slightly curved inward in the tire radial direction. It should be noted that the degree of curvature of both ends of the belt 26 in the tire width direction is smaller than the degree of curvature of the carcass 16. Therefore, most of the belt 26 is in close contact with the outer peripheral surface of the carcass 16 at the center in the tire width direction, but a part of both sides in the width direction is separated from the outer peripheral surface of the carcass 16.
  • the belt 26 of the present embodiment is formed by winding a plurality (two in the present embodiment) of reinforcing cords 30 around a resin-coated cord 34 covered with a resin 32. A method for manufacturing the belt 26 will be described later.
  • the reinforcing cord 30 of the belt 26 is preferably thicker than the cord of the carcass ply 14 and has a high strength (tensile strength).
  • the reinforcing cord 30 of the belt 26 can be composed of monofilament (single wire) such as metal fiber or organic fiber, or multifilament (twisted wire) obtained by twisting these fibers.
  • the reinforcing cord 30 of the present embodiment is a steel cord.
  • the resin 32 that covers the reinforcing cord 30 is made of a rubber material that constitutes the side rubber layers 24A and 24B and a resin material that has a higher tensile elastic modulus than a rubber material that constitutes the tread portion 36 described later.
  • an elastic thermoplastic resin, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used as the resin 32 covering the reinforcing cord 30.
  • TPE thermoplastic elastomer
  • thermosetting resin or the like.
  • 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 examples include polyurethane resin, polyolefin resin, vinyl chloride resin, polyamide resin and the like.
  • the deflection temperature under load (when 0.45 MPa is loaded) specified in ISO 75-2 or ASTM D648 is 78 ° C or higher
  • the tensile yield strength specified in JIS K7113 is 10 MPa.
  • JIS K7113 examples of the thermoplastic resin material
  • a tensile fracture elongation specified by JIS K7113 of 50% or more and a Vicat softening temperature (Method A) specified by JIS K7206 of 130 ° C. or more can be used.
  • the tensile elastic modulus (specified in JIS K7113: 1995) of the resin 32 covering the reinforcing cord 30 is preferably 100 MPa or more.
  • the upper limit of the tensile modulus of the resin 32 that covers the reinforcing cord 30 is preferably set to 1000 MPa or less.
  • the tensile elastic modulus of the resin 32 covering the reinforcing cord 30 is particularly preferably in the range of 200 to 700 MPa.
  • the thickness t 1 (see FIG. 2A) of the belt 26 of the present embodiment is preferably larger than the diameter dimension of the reinforcing cord 30.
  • the reinforcing cord 30 is completely embedded in the resin 32.
  • the thickness t 1 of the belt 26 is preferably 0.70 mm or more.
  • the vicinity of the end portion 26A in the tire width direction of the belt 26 is covered and restrained by a belt-like layer 38 from the outer side in the tire radial direction.
  • the layer 38 preferably covers at least the outermost reinforcing cord 30 in the tire width direction of the belt 26 from the outer side in the tire radial direction, and further preferably covers a curved portion of the belt 26.
  • the layer 38 covers the end portion 26A of the belt 26 from the outer side in the tire width direction. Note that the layer 38 extends outward in the tire width direction from the end portion 26A of the belt 26.
  • a plurality of cords 40 arranged in parallel and coated with a rubber material 42 can be used.
  • the cord used for the layer 38 include an organic fiber cord and a steel cord.
  • a cord having a lower bending rigidity than the cord used for the belt 26, in other words, a cord thinner than the cord used for the belt 26 can be used.
  • the rubber material 42 used for the layer 38 a material having a tensile elastic modulus intermediate between the resin 32 covering the reinforcing cord 30, the rubber material constituting the side rubber layers 24A and 24B, and the rubber material constituting the tread portion 36 is used. Can do.
  • the rigidity distribution in the tire width direction there is a large difference in rigidity between the belt 26 in which the reinforcing cord 30 is embedded and the tread portion 36 made of only rubber, in other words, the difference in rigidity is large. Stress is likely to concentrate at a portion where the rigidity changes greatly, such as near the end portion 26A of the belt 26.
  • the rigidity can be gradually changed from the end portion 26A of the belt 26 to the tread portion 36 when viewed in the tire width direction. It is possible to suppress the concentration of stress in the vicinity of the end portion 26A.
  • a buffer layer 44 is provided between the layer 38 and the belt 26.
  • the buffer layer 44 serves to buffer the force received by the belt 26 from the layer 38 disposed on the outer side in the tire radial direction, and may be formed of a material having a lower tensile elastic modulus than the resin 32 of the belt 26. preferable.
  • the material for forming the buffer layer 44 may be a material having elasticity, and may be a rubber material or a resin material.
  • the buffer layer 44 of this embodiment is formed of a rubber material.
  • the layer 38 of this embodiment since the cord 40 is covered with the rubber material 42 and the buffer layer 44 is formed of the rubber material, the layer 38 and the buffer layer 44 are bonded to each other, and the bonding between the two is performed. Strength can be increased.
  • the thickness t 2 of the buffer layer 44 is preferably set within a range of 0.1 to 1.0 mm.
  • a tread portion 36 made of the second rubber material is disposed outside the belt 26 in the tire radial direction.
  • a conventionally known material is used as the second rubber material used for the tread portion 36.
  • a drainage groove 37 is formed in the tread portion 36. Further, a conventionally known pattern is used for the tread portion 36 as well.
  • the width BW of the belt 26 measured along the tire axial direction is preferably 75% or more with respect to the contact width TW of the tread portion 36 measured along the tire axial direction.
  • the upper limit of the width BW of the belt 26 is preferably 110% with respect to the ground contact width TW.
  • the contact width TW of the tread portion 36 means that the pneumatic tire 10 is mounted on a standard rim prescribed in JATMA YEAR BOOK (2018 version, Japan Automobile Pneumatic Tire Association Standard), and in JATMA YEAR BOOK 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) for the applicable size and ply rating, and the rotating shaft is stationary against a horizontal flat plate It is a thing when it arrange
  • the TRA standard or ETRTO standard is applied at the place of use or manufacturing, the respective standards are followed.
  • the in-plane shear rigidity of the belt 26 is preferably equal to or higher than that of a belt having a conventional structure in which a cord is covered with rubber.
  • the belt 26 is formed by spirally winding a resin-coated cord 34 in which two reinforcing cords 30 are coated with a coating resin 32 around a belt forming drum (not shown). At that time, the resin-coated cords 34 are welded adjacent to each other.
  • the cross-sectional shape of the resin-coated cord 34 according to the present embodiment is a rectangle (horizontal width rectangle), but the resin-coated cord 34 may be any cross-sectional shape that is joined adjacent to each other. It may be a shape.
  • the resin coating cord 34 is welded adjacent to each other, thereby forming a resin layer as an example of the present invention in which the reinforcing cord 30 is embedded.
  • the belt 26, which has been cooled and solidified by the resin 32, is removed from the belt forming drum and placed outside the tire case 25 in the radial direction of the tire forming drum, and pressure is applied from the inside to expand the unvulcanized tire case 25.
  • the outer peripheral surface of the tire case 25, in other words, the outer peripheral surface of the carcass 16 is crimped to the inner peripheral surface of the belt 26.
  • the buffer layer 44 and the layer 38 are pasted so as to cover both ends of the belt 26.
  • an unvulcanized tread portion 36 is attached to the outer peripheral surface of the belt 26 in the same manner as in the production of a general pneumatic tire, and the raw tire is completed.
  • the raw tire produced in this way is vulcanized and molded with a vulcanization mold in the same manner as a general pneumatic tire, and the pneumatic tire 10 is completed.
  • the layer 38 including the cord 40 is disposed on the outer side in the tire radial direction near the end portion 26A of the belt 26, and the vicinity of the end portion 26A of the belt 26 is constrained by the layer 38. . Strictly speaking, the belt 26 is restrained by the cord 40 of the layer 38.
  • the resin 32 of the belt 26 receives a force F directed inward in the tire radial direction from the cord 40 of the layer 38 ( Note that the force F increases as the rotation increases), and the resin 32 may cause a crack C in a portion that receives the force F (as an example, directly below the cord 40).
  • the buffer layer 44 is provided between the layer 38 and the belt 26, the force F from the cord 40 of the layer 38 is applied to the buffer layer. It is buffered at 44, in other words, dispersed and acting on the belt 26, thereby suppressing the concentration of stress and suppressing the occurrence of cracks in the resin 32 of the belt 26.
  • the thickness t 2 of the buffer layer 44 is preferably set in the range of 0.1 to 1.0 mm.
  • the crown portion of the carcass 16 is reinforced by a belt 26 in which a reinforcing cord 30 spirally wound is covered with a resin 32, so that two conventional pneumatic tires are used.
  • the belt is lighter and easier to manufacture.
  • the tensile elastic modulus of the resin 32 covering the reinforcing cord 30 is 100 MPa or more and the thickness is 0.7 mm or more, in-plane shearing of the belt 26 in the tire width direction is achieved. Sufficient rigidity can be ensured.
  • the out-of-plane bending rigidity of the belt 26 is ensured, when a large lateral force is input to the pneumatic tire 10, the buckling of the tread portion 36 (the surface of the tread portion 36 undulates and a part of the road surface Phenomenon).
  • the belt 26 having high in-plane shear rigidity is used, and the width BW of the belt 26 is set to 75% or more of the ground contact width TW of the tread portion 36. Stiffness can be increased.
  • the thickness of the belt 26 can be reduced as compared with the case where the belt 26 is constituted by two or more conventional belt plies.
  • the thickness of the groove 37 can be increased, and the depth of the groove 37 can be increased. Thereby, the lifetime of the pneumatic tire 10 can be extended.
  • the reinforcing cord 30 is wound spirally, a portion overlapping the reinforcing cord 30 in the tire radial direction on the circumference without, the thickness t 1 in the tire circumferential direction is uniform Therefore, the pneumatic tire 10 is excellent in uniformity.
  • the thickness t 1 of the belt 26 in other words, the thickness of the resin 32 is less than 0.7 mm, there is a possibility that the reinforcing cord 30 embedded in the resin 32 is thickened and the tag effect cannot be obtained.
  • width BW of the belt 26 is less than 75% with respect to the ground contact width TW of the tread portion 36, it is difficult to suppress the effect of the belt 26 or to suppress the generation of noise near the shoulder 39. There is a risk of becoming.
  • the width BW of the belt 26 exceeds 110% with respect to the ground contact width TW of the tread portion 36, the tagging effect will reach a peak state, the belt 26 will be more than necessary, and the weight of the pneumatic tire 10 will increase.
  • the resin-coated cord 34 used for manufacturing the belt 26 is obtained by coating the two reinforcing cords 30 with the resin 32.
  • the resin-coated cord 34 has one reinforcing cord 30. It may be one that is coated with the resin 32, or three or more reinforcing cords 30 that are covered with the resin 32.
  • the belt 26 only needs to include at least a resin layer continuous from one end side to the other end side in the width direction, and the arrangement of the cord, the thickness of the layer, and the like are not limited to those of the above embodiment. Further, the belt 26 may not include the reinforcing cord 30 as long as strength is ensured (that is, only the resin layer).
  • the layer 38 covers only the vicinity of the end portion 26A of the belt 26.
  • the entire belt 26 is covered from the outside in the tire radial direction with at least one layer 38 formed wide.
  • the layer 38 that covers only the vicinity of the end portion 26A and the wide layer 38 that covers the entire belt 26 may be used in combination.
  • the buffer layer 44 may be provided in the whole lower part of the layer 38, and may be arrange

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

Abstract

Un pneu selon la présente invention comprend : une carcasse s'étendant d'un talon à l'autre ; une ceinture disposée sur le côté extérieur de la carcasse dans une direction radiale du pneu et comprenant au moins une couche de résine ; une couche recouvrant au moins une partie d'extrémité de la ceinture dans la direction de la largeur du pneu ; et une couche tampon disposée entre la carcasse et la couche.
PCT/JP2019/021328 2018-06-15 2019-05-29 Pneu WO2019239895A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018114327A JP2019217798A (ja) 2018-06-15 2018-06-15 空気入りタイヤ
JP2018-114327 2018-06-15

Publications (1)

Publication Number Publication Date
WO2019239895A1 true WO2019239895A1 (fr) 2019-12-19

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ID=68843295

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/021328 WO2019239895A1 (fr) 2018-06-15 2019-05-29 Pneu

Country Status (2)

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JP (1) JP2019217798A (fr)
WO (1) WO2019239895A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5082713A (en) * 1990-07-23 1992-01-21 Pirelli Armstrong Tire Corporation Wide monofilament reinforcing cords employing high performance thermoplastics and tire belts made therefrom
JP2002331806A (ja) * 2001-05-09 2002-11-19 Yokohama Rubber Co Ltd:The 熱可塑性エラストマー被覆スチールコードを用いた空気入りタイヤ
JP2006044487A (ja) * 2004-08-05 2006-02-16 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
JP2007069745A (ja) * 2005-09-07 2007-03-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2015515412A (ja) * 2012-04-06 2015-05-28 コンパニー ゼネラール デ エタブリッスマン ミシュラン ラジアル又はクロスプライカーカスを備えたタイヤ
JP2016215831A (ja) * 2015-05-20 2016-12-22 横浜ゴム株式会社 空気入りタイヤ
US20170136821A1 (en) * 2014-06-26 2017-05-18 Compagnie Generale Des Etablissements Michelin Tire Comprising A Layer Of Circumferential Reinforcement Elements
JP2017517429A (ja) * 2014-04-29 2017-06-29 コンパニー ゼネラール デ エタブリッスマン ミシュラン 多複合体平面補強材
WO2018074196A1 (fr) * 2016-10-18 2018-04-26 株式会社ブリヂストン Pneu
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
WO2018235624A1 (fr) * 2017-06-19 2018-12-27 株式会社ブリヂストン Pneumatique

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5082713A (en) * 1990-07-23 1992-01-21 Pirelli Armstrong Tire Corporation Wide monofilament reinforcing cords employing high performance thermoplastics and tire belts made therefrom
JP2002331806A (ja) * 2001-05-09 2002-11-19 Yokohama Rubber Co Ltd:The 熱可塑性エラストマー被覆スチールコードを用いた空気入りタイヤ
JP2006044487A (ja) * 2004-08-05 2006-02-16 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
JP2007069745A (ja) * 2005-09-07 2007-03-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2015515412A (ja) * 2012-04-06 2015-05-28 コンパニー ゼネラール デ エタブリッスマン ミシュラン ラジアル又はクロスプライカーカスを備えたタイヤ
JP2017517429A (ja) * 2014-04-29 2017-06-29 コンパニー ゼネラール デ エタブリッスマン ミシュラン 多複合体平面補強材
US20170136821A1 (en) * 2014-06-26 2017-05-18 Compagnie Generale Des Etablissements Michelin Tire Comprising A Layer Of Circumferential Reinforcement Elements
JP2016215831A (ja) * 2015-05-20 2016-12-22 横浜ゴム株式会社 空気入りタイヤ
WO2018074196A1 (fr) * 2016-10-18 2018-04-26 株式会社ブリヂストン Pneu
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
WO2018235624A1 (fr) * 2017-06-19 2018-12-27 株式会社ブリヂストン Pneumatique

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