WO2019116861A1 - Pneumatique - Google Patents

Pneumatique Download PDF

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Publication number
WO2019116861A1
WO2019116861A1 PCT/JP2018/043293 JP2018043293W WO2019116861A1 WO 2019116861 A1 WO2019116861 A1 WO 2019116861A1 JP 2018043293 W JP2018043293 W JP 2018043293W WO 2019116861 A1 WO2019116861 A1 WO 2019116861A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
frame member
layer
cord
tire frame
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/043293
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English (en)
Japanese (ja)
Inventor
健児 松井
吉史 松本
桑原　隆
彩華 三好
福島　敦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Bridgestone Corp filed Critical Bridgestone Corp
Publication of WO2019116861A1 publication Critical patent/WO2019116861A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/01—Inflatable pneumatic tyres or inner tubes without substantial cord reinforcement, e.g. cordless tyres, cast tyres

Definitions

  • the present disclosure relates to a tire in which a tire frame member is formed using a resin material.
  • thermoplastic polymer material such as a thermoplastic elastomer (TPE) and a thermoplastic resin as a tire frame member (for example, 143701)).
  • the side portion When the tire rotates, the side portion is repeatedly deformed. For this reason, when the tire is used for a long time, the resin material constituting the tire frame member may be fatigued, which may cause a minute crack in the tire frame member.
  • a reinforcing layer including a reinforcing cord on the outer side of the tire frame member.
  • the tire side portion is greatly deformed. The cord strongly pressed the tire frame member at the portion, stress may be applied to the tire frame member in the vicinity of the cord, and a crack may develop, and there is room for improvement.
  • the present disclosure aims to provide a tire capable of suppressing the development of a crack in a resin-made tire frame member.
  • a tire according to a first aspect is a resin material having a bead portion, a side portion continuous to the tire radial direction outer side of the bead portion, and a crown portion continuous to the tire width direction inner side of the side portion and a tread is disposed. And a reinforcing layer disposed on the tire outer surface side of the tire frame member and including a cord, and disposed between the tire frame member and the reinforcing layer, the tire frame member And a stress relieving layer for relieving a generated stress.
  • the stress relieving layer is disposed between the tire frame member and the reinforcing layer, for example, when the side portion of the tire is deformed, it is pressed by the cord of the reinforcing layer and the tire
  • the stress generated in the framework member can be relieved by the stress relieving layer.
  • the excellent effect of being able to relieve the stress of the tire frame member is obtained.
  • FIGS. 1 to 2A First Embodiment A tire 10 according to a first embodiment of the present invention will be described according to FIGS. 1 to 2A.
  • a tire 10 As shown in FIG. 1, a tire 10 according to the present embodiment is, for example, a tire for a passenger car.
  • the tire 10 includes a tire frame member 12.
  • the tire frame member 12 is made of a resin material, and the bead portion 16, the side portion 18 connected to the tire radial direction outer side of the bead portion 16 and the tire width direction inner side of the side portion 18 are arranged. And a crown portion 26.
  • the bead portion 16 refers to the inner end of the tire frame member 12 in the tire radial direction to 30% of the height of the cross section of the tire.
  • the tire frame member 12 has an annular shape around the tire rotation axis.
  • resin materials constituting the tire frame member 12 include thermoplastic resins (including thermoplastic elastomers), thermosetting resins, and other general purpose resins, as well as engineering plastics (including super engineering plastics).
  • the resin material here does not include vulcanized rubber.
  • thermoplastic resin refers to a polymer compound which softens and flows as the temperature rises and becomes relatively hard and strong when cooled.
  • the material softens and flows as temperature rises, and becomes relatively hard and strong when cooled
  • the polymer compound having rubbery elasticity is a thermoplastic elastomer, and the material increases as temperature rises.
  • a polymer compound having no rubbery elasticity is distinguished as a non-elastomer thermoplastic resin.
  • thermoplastic resins include polyolefin thermoplastic elastomer (TPO), polystyrene thermoplastic elastomer (TPS), polyamide thermoplastic elastomer (TPA), polyurethane thermoplastic elastomer (TPU), polyester Thermoplastic elastomers (TPC), dynamically crosslinked thermoplastic elastomers (TPV), and polyolefin thermoplastic resins, polystyrene thermoplastic resins, polyamide thermoplastic resins, polyester thermoplastic resins, etc. It can be mentioned.
  • TPO polyolefin thermoplastic elastomer
  • TPS polystyrene thermoplastic elastomer
  • TPA polyamide thermoplastic elastomer
  • TPU polyurethane thermoplastic elastomer
  • TPC polyester Thermoplastic elastomers
  • TPV dynamically crosslinked thermoplastic elastomers
  • the deflection temperature under load (at 0.45 MPa load) defined in ISO 75-2 or ASTM D 648 is 78 ° C. or higher
  • the tensile yield strength defined in JIS K7113 is 10 MPa.
  • JIS K7113 tensile elongation at break
  • a method Vicat softening temperature
  • thermosetting resin refers to a polymer compound which forms a three-dimensional network structure with temperature rise and hardens.
  • a thermosetting resin a phenol resin, an epoxy resin, a melamine resin, a urea resin etc. are mentioned, for example.
  • resin materials include (meth) acrylic resins, EVA resins, vinyl chloride resins, fluorine resins, silicone resins, etc. General-purpose resins may be used.
  • a bead core 22 is embedded in the bead portion 16.
  • the thermoplastic material constituting the bead core 22 is preferably an olefin, ester, amide, or urethane TPE, or a TPV obtained by kneading a part of a rubber resin.
  • the deflection temperature under load (at 0.45 MPa load) specified in ISO 75-2 or ASTM D 648 is 75 ° C. or higher
  • the tensile yield elongation specified in JIS K7113 is also 10% or higher.
  • the tensile elongation at break defined in JIS K7113 is 50% or more
  • the Vicat softening temperature (Method A) defined in JIS K7113 is 130 ° C. or more.
  • the bead core 22 is annular, and is made of a thermoplastic material having a higher elastic modulus than the resin material of the tire frame member 12.
  • the elastic modulus of the bead core 22 is preferably 1.5 times or more, and more preferably 2.5 times or more that of the tire frame member 12.
  • the bead portion 16 may be lifted outward in the tire radial direction and removed from the rim 24 at 1.5 times or less.
  • the bead core 22 may be formed by insert molding (injection molding) or the like using a hard resin, and the method of forming the bead core 22 is not particularly limited.
  • the bead core 22 may be shaped so as to be undulated in the tire circumferential direction so that the bead core radius varies depending on the position in the tire circumferential direction. In this case, the bead core 22 itself can be extended to some extent, and the rim assembly becomes easy. Further, the bead core 22 is not limited to the resin (thermoplastic material), and may be formed by spirally stacking resin-coated steel cords in the tire circumferential direction.
  • a crown portion 26 is continuous with the outer side of the side portion 18 in the tire radial direction.
  • a belt layer 28 is provided on the outer periphery of the crown portion 26.
  • the belt layer 28 is configured, for example, by spirally winding a cord 28B coated with a resin 28A in the tire circumferential direction.
  • a tread 32 is provided on the tire radial direction outer side of the crown portion 26 and the belt layer 28.
  • the tread 32 is, for example, a pre-cured tread (PCT: Pre-Cured tread) formed using rubber. Further, the tread 32 is formed of rubber that is superior in abrasion resistance to the resin material forming the tire frame member 12.
  • PCT Pre-Cured tread
  • the tread 32 is formed of rubber that is superior in abrasion resistance to the resin material forming the tire frame member 12.
  • the rubber it is possible to use the same kind of tread rubber as used in a conventional general pneumatic tire using rubber as an elastic material, for example, SBR (styrene-butadiene rubber).
  • SBR styrene-butadiene rubber
  • a reinforcing layer 14 is disposed on the outer side surface of the tire frame member 12. As shown in FIG. 2A, the reinforcing layer 14 has a plurality of cords 30 arranged in parallel to each other covered with a rubber material 34, and extends from the bead portion 16 to the side portion 18 as shown in FIG.
  • the reinforcing layer 14 may have, for example, a configuration similar to that of a carcass ply used in a conventional rubber pneumatic tire.
  • the cords 30 are, for example, a collection of twisted cords and a plurality of filaments.
  • the material of the cord 30 is, for example, a metal such as aliphatic polyamide, polyethylene terephthalate, glass, aramid or steel.
  • the cords 30 extend in the tire radial direction, but may extend in a direction inclined with respect to the tire radial direction.
  • the reinforcing layer 14 is fastened to the bead core 22 embedded in the bead portion 16. Specifically, the tire radial direction inner end 14 A of the reinforcing layer 14 is disposed on the tire inner surface side through the tire radial direction inner side of the bead core 22.
  • the tire radial direction outer end 14 C of the reinforcing layer 14 extends from the bead portion 16 of the tire frame member 12 through the side portion 18 to the crown portion 26 and reaches the belt layer 28.
  • the reinforcing layer 14 may extend to the center in the tire width direction.
  • the position of the tire radial direction outer end 14C of the reinforcing layer 14 may be terminated near the tire maximum width position in the side portion 18 or is terminated before the crown portion 26 (so-called buttress portion). May be
  • the reinforcing layer 14 in the present embodiment corresponds to a carcass layer in a conventional rubber-made pneumatic tire.
  • a stress relaxation layer 36 is disposed between the tire frame member 12 and the reinforcing layer 14.
  • the stress relieving layer 36 is provided over the whole surface of the reinforcement layer 14 in this embodiment.
  • the stress relieving layer 36 can be made of, for example, a resin material that is softer than the material of the cord 30 and harder than the resin material that constitutes the tire frame member 12.
  • soft and hard specifically mean tensile modulus.
  • a resin material having a tensile elastic modulus in the range of 200 MPa to 200 GPa as shown in JIS K7161-1: 2014 can be used.
  • the elastic modulus is high, it is necessary to consider the brittleness, and in the case of using a resin material having a high elastic modulus, it is necessary to make the film thickness thin to complement the flexibility.
  • the preferable elastic modulus range is 200 MPa to 2 GPa.
  • the resin material which comprises the stress relaxation layer 36 can use the resin material of the same kind as the resin material which comprises the tire frame member 12, it can also use different resin materials.
  • a resin material which comprises the stress relaxation layer 36 nylon 12 and various thermoplastic elastomers (TPO, TPEE, PVC, TPV, TPU, TPS) can be used, for example.
  • the tire frame member 12 made of a resin material and the stress relaxation layer 36 made of a resin material are joined by welding, but they may be joined using an adhesive.
  • the tire frame member 12 made of a resin material and the rubber material of the reinforcing layer 14 are joined by an adhesive 38.
  • the stress relieving layer 36 may include a reinforcing material such as a fiber, and as an example, a plurality of small diameter cords thinner than the cord 30 and smaller in bending rigidity than the cord 30 are juxtaposed and embedded.
  • the fabric may be embedded or the non-woven fabric may be embedded.
  • the material used for the small diameter cord, the woven fabric, and the non-woven fabric may be the same as or different from the material of the cord 30, and the same material as the fiber used for the conventional general rubber pneumatic tire is used be able to.
  • the stress relieving layer 36 is made of a single resin material, and a reinforcing material such as a small diameter cord, a woven fabric, or a non-woven fabric may not be embedded.
  • the stress relieving layer 36 may be set to a thickness that can relieve the stress generated in the tire frame member 12, and the actual size is not particularly limited.
  • a side rubber layer 40 is provided on the tire outer surface 14 ⁇ / b> B side of the reinforcing layer 14.
  • the side rubber layer 40 may be of the same kind as the rubber constituting the sidewall of a conventional general pneumatic tire using rubber as an elastic material.
  • the side rubber layer 40 may be a resin layer.
  • the resin material of the tire frame member 12 or the adhesive 38 is fatigued by long-term use, and a minute crack is generated in either the resin material of the tire frame member 12 or the adhesive 38 May occur.
  • a large stress acting in the vicinity of the cord 30 of the tire frame member 12 causes it.
  • the crack 42 may accelerate inward of the tire frame member 12 at an accelerated rate.
  • the cracks 42 may be connected to form a large crack 44 along the reinforcing layer 14.
  • the stress relieving layer 36 is disposed between the tire frame member 12 and the reinforcing layer 14, the stress generated in the tire frame member 12 due to the pressing of the cords 30 is stressed. It can be relieved by the relief layer 36, which can suppress the inward development of cracks in the tire frame member 12.
  • the stress relieving layer 36 may be provided opposite to the portion of the tire frame member 12 where the stress is to be relieved, and may not be provided over the entire surface of the reinforcing layer 14.
  • the presence of the reinforcing layer 14 on the outer surface side of the tire frame member 12 can suppress trauma to the tire frame member 12. Furthermore, since the reinforcing layer 14 is locked to the bead core 22, the tension generated in the tire can be borne by the reinforcing layer 14, and the resistance to internal pressure is improved. Moreover, since the thickness of the tire frame member 12 can be made thin by this, riding comfort can be improved.
  • FIG. 2B A tire 10 according to a second embodiment of the present invention will be described according to FIG. 2B.
  • the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
  • a stress relieving layer 46 formed of a rubber material is provided between the tire frame member 12 and the reinforcing layer 14.
  • a rubber material used for the stress relieving layer 46 a rubber material used for a conventional general rubber pneumatic tire can be used.
  • the rubber material of the reinforcing layer 14 and the stress relieving layer 46 formed of the rubber material may be bonded by vulcanization or may be bonded by an adhesive.
  • the stress relieving layer 46 formed of a rubber material and the tire frame member 12 formed of a resin material are bonded by an adhesive 48.
  • the stress relieving layer 46 is provided between the tire frame member 12 and the reinforcing layer 14, the stress of the tire frame member 12 is suppressed. Even if a crack is generated in the tire frame member 12, the progress of the crack can be suppressed.
  • the tire 1 of the example having the structure of the above embodiment and the tire 2 obtained by removing the stress relieving layer from the tire 1 were made as an experiment, and the tire framework member was observed after traveling for a predetermined distance.
  • Tire size 215/45 R17 Construction of Reinforcement Layer: As a cord material, rayon, PET, PEN, nylon 6,6, nylon 6, an aramid or the like is used. In general, PET or rayon is used. The number of implanted cords can be 8 to 13/10 mm. The thickness of the coated rubber can be 0.2 to 0.5 mm. The thickness of the layer can be 1.0 to 1.5 mm. Structure of stress relieving layer: Material is rubber. The thickness is 0.3 to 1.0 mm. The elastic modulus is 300 MPa. Test method: FMVSS 139 endurance test was conducted. The test method sets the load, speed, time, and air pressure as shown in Table 1 below, and continues the test under the same conditions as in step 11 after step 11.
  • the load is a load corresponding to the maximum load capacity when the single book of Year Book 2017 edition of JATMA (Japan Automobile Tires Association) is applied. Outside Japan, load means the maximum load (maximum load capacity) of a single wheel in the application size described in the following standard.
  • the standards are determined by the industry standards that are valid for the area where the tire is produced or used. For example, in the United States, it is "Year Book of The Tire and Rim Association Inc.”, and in Europe, it is “Standards Manual of The European Tire and Rim Technical Organization".
  • the tires were mounted on standard rims (or “Approved Rim", “Recommended Rim") corresponding to the size of the radial ply tire specified in the standard.
  • the stress relieving layers 36 and 46 in the above embodiment have a constant thickness
  • the stress relieving layers 36 and 46 may not be constant in thickness, and are formed thick at a portion where stress is likely to concentrate, Others may be formed thin.
  • the stress relieving layers 36 and 46 are formed thick at the tire maximum width of the side portion 18 where a large stress easily acts, and toward the crown portion 26 side and the bead portion 16 where a relatively small stress acts. The thickness may be gradually reduced. Thus, by changing the thickness of the stress relieving layers 36, 46 as necessary, the material usage of the stress relieving layers 36, 46 can be minimized.
  • shear stress may be generated between the cord 30 of the reinforcing layer 14 and the tire frame member 12 during running under load, but the stress relieving layers 36 and 38 may also suppress this shear stress. It is possible.
  • the stress relieving layer 36 is formed of a resin material
  • the stress relieving layer 46 is formed of a rubber material, but the present invention is not limited thereto. It may be formed of a mixture of a rubber material and a resin material, or may be formed of another material.
  • the present invention can also be applied to a side reinforced type run flat tire having a reinforcing layer made of hard rubber or the like in the tire side portion, and is not limited to a four-wheeled tire but also to a two-wheeled tire. Applicable

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

Abstract

L'invention concerne un pneumatique comprenant : un élément de structure de pneumatique qui est formé à partir d'un matériau de résine et qui comprend une partie talon, une partie latérale qui va jusqu'à la partie talon sur le côté externe dans la direction radiale du pneumatique, et une partie sommet qui va jusqu'à la partie latérale sur le côté interne dans la direction de la largeur du pneumatique, une bande de roulement se trouve dans ladite partie sommet ; une couche d'armature qui se trouve sur le côté de surface externe de pneumatique de l'élément de structure de pneumatique et qui est conçue pour contenir un câble ; et une couche de relaxation de contrainte qui se trouve entre l'élément de structure de pneumatique et la couche d'armature et qui relâche la contrainte produite dans l'élément de structure de pneumatique.
PCT/JP2018/043293 2017-12-13 2018-11-22 Pneumatique Ceased WO2019116861A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-238884 2017-12-13
JP2017238884A JP2019104418A (ja) 2017-12-13 2017-12-13 タイヤ

Publications (1)

Publication Number Publication Date
WO2019116861A1 true WO2019116861A1 (fr) 2019-06-20

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PCT/JP2018/043293 Ceased WO2019116861A1 (fr) 2017-12-13 2018-11-22 Pneumatique

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WO (1) WO2019116861A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113543986A (zh) * 2019-10-08 2021-10-22 住友橡胶工业株式会社 充气轮胎
CN113543989A (zh) * 2019-10-08 2021-10-22 住友橡胶工业株式会社 充气轮胎

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0183103U (fr) * 1987-11-25 1989-06-02
JPH03148302A (ja) * 1989-11-01 1991-06-25 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH05116504A (ja) * 1991-04-15 1993-05-14 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH07329065A (ja) * 1994-06-03 1995-12-19 Sumitomo Rubber Ind Ltd 空気入りタイヤ及びその製造方法
JP2011207165A (ja) * 2010-03-30 2011-10-20 Bridgestone Corp タイヤの製造方法及びタイヤ
WO2017200061A1 (fr) * 2016-05-20 2017-11-23 株式会社ブリヂストン Pneu

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0183103U (fr) * 1987-11-25 1989-06-02
JPH03148302A (ja) * 1989-11-01 1991-06-25 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH05116504A (ja) * 1991-04-15 1993-05-14 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH07329065A (ja) * 1994-06-03 1995-12-19 Sumitomo Rubber Ind Ltd 空気入りタイヤ及びその製造方法
JP2011207165A (ja) * 2010-03-30 2011-10-20 Bridgestone Corp タイヤの製造方法及びタイヤ
WO2017200061A1 (fr) * 2016-05-20 2017-11-23 株式会社ブリヂストン Pneu

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113543986A (zh) * 2019-10-08 2021-10-22 住友橡胶工业株式会社 充气轮胎
CN113543989A (zh) * 2019-10-08 2021-10-22 住友橡胶工业株式会社 充气轮胎
CN113543989B (zh) * 2019-10-08 2023-10-20 住友橡胶工业株式会社 充气轮胎

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