WO2019230772A1 - Bandage pneumatique - Google Patents

Bandage pneumatique Download PDF

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Publication number
WO2019230772A1
WO2019230772A1 PCT/JP2019/021237 JP2019021237W WO2019230772A1 WO 2019230772 A1 WO2019230772 A1 WO 2019230772A1 JP 2019021237 W JP2019021237 W JP 2019021237W WO 2019230772 A1 WO2019230772 A1 WO 2019230772A1
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WO
WIPO (PCT)
Prior art keywords
resin
annular body
width direction
tire
tire width
Prior art date
Application number
PCT/JP2019/021237
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English (en)
Japanese (ja)
Inventor
啓之 筆本
Original Assignee
株式会社ブリヂストン
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Filing date
Publication date
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Publication of WO2019230772A1 publication Critical patent/WO2019230772A1/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.
  • an inclined belt including a metal cord inclined with respect to the tire circumferential direction on the outer side in the tire radial direction of the carcass disposed across the bead portions, and a circumference including a metal cord extending along the tire circumferential direction.
  • a pneumatic tire in which a belt including a directional belt is disposed.
  • Patent Document 1 discloses a carcass, an active reinforcing material composed of a single layer of reinforcing elements inclined by 4 ° to 7 ° with respect to the tire circumferential direction, and a flat surface positioned in the central portion of the crown of the carcass.
  • a tire comprising a crown reinforcement comprising a circumferential polymer reinforcement element is disclosed.
  • the weight of the tire can be reduced by using a part of the belt layer including the cord as a flat circumferential polymer reinforcing element as a resin annular body.
  • the tire disclosed in Patent Document 1 still has room for improvement from the viewpoint of durability of the resin annular body.
  • An object of the present invention is to provide a pneumatic tire in which the durability of the resin annular body is improved while reducing the weight using the resin annular body.
  • the pneumatic tire according to the first aspect of the present invention is coated with a resin annular body having a reduced diameter portion whose outer diameter decreases toward the outer end in the tire width direction at both ends in the tire width direction, and a coating resin.
  • the resin-coated cord is formed of a resin-coated cord, and the resin-coated cord extends in the tire radial direction of the resin annular body across the reduced diameter portions at both ends in the tire width direction of the resin annular body.
  • a resin-coated belt formed in a spirally wound state with respect to the outer surface, and the resin-coated belt is joined to the resin annular body.
  • the maximum thickness at both ends in the tire width direction is thicker than the maximum thickness at the center in the tire width direction of the resin annular body.
  • “applicable rim” is an industrial standard that is effective in the area where pneumatic tires are produced and used.
  • JATMA Joint Automobile Tire Association
  • JATMA YEAR BOOK JATMA YEAR BOOK
  • ETRTO European STANDARDS MANUAL of TIRE and RIM Technical Organization
  • STANDARDS of ETRATO STANDARDS in the applicable size described in YEAR BOOK etc.
  • TRA The Tire and Rim Association, Inc.
  • Applied Rim refers to future sizes in addition to the current size
  • Sizes to be described in the future include the sizes described as “FUTURE DEVELOPMENTS” in the ETRTO 2013 edition).
  • a size not described in the industry standard it means a rim having a width corresponding to the bead width of the pneumatic tire.
  • the “specified internal pressure” refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity of a single wheel in the applicable size / ply rating described in the above JATMA YEAR BOOK, etc. In the case of no size, the air pressure (maximum air pressure) corresponding to the maximum load capacity defined for each vehicle on which the tire is mounted is assumed. In addition, the “maximum load load” described later is defined for each vehicle on which a tire is mounted in the case of a tire maximum load capacity of the standard of JATMA or the like in the tire of an applicable size, or in the case of a size not described in the industrial standard. It means the load corresponding to the maximum load capacity.
  • FIG. 1 is a view showing a pneumatic tire 1 (hereinafter simply referred to as “tire 1”) as the present embodiment.
  • FIG. 1 is a cross-sectional view of the tire 1 in a cross section parallel to the tire width direction A.
  • this cross section is referred to as “tire width direction cross section”.
  • the tire 1 of this embodiment is a structure symmetrical with respect to the tire equatorial plane CL, a structure asymmetrical with respect to the tire equatorial plane CL may be sufficient.
  • the tire 1 includes a tread portion 1a, a pair of sidewall portions 1b extending inward in the tire radial direction B from both ends in the tire width direction A of the tread portion 1a, and each sidewall portion 1b. And a pair of bead portions 1c provided at the inner end in the tire radial direction B.
  • the tire 1 of this embodiment is a tubeless type radial tire for a passenger car.
  • the “tread portion 1a” means a portion sandwiched between the tread ends TE on both sides in the tire width direction A.
  • the “bead portion 1 c” means a portion where a bead member 3 described later is located in the tire radial direction B.
  • the “sidewall portion 1b” means a portion between the tread portion 1a and the bead portion 1c.
  • the “tread end TE” means a position on the outermost side in the tire width direction of the ground contact surface in a state where the tire is mounted on the above-described application rim, filled with the above-mentioned specified internal pressure, and a maximum load is applied. .
  • the tire 1 includes a bead member 3, a carcass 4, a resin annular body 5, a resin-coated belt 6, a tread rubber 7, a side rubber 8, and an inner liner 9.
  • the bead member 3 is embedded in the bead portion 1c.
  • the bead member 3 includes a bead core 3a and a rubber bead filler 3b positioned on the outer side in the tire radial direction B with respect to the bead core 3a.
  • the bead core 3a includes a plurality of bead wires that are covered with rubber.
  • the bead wire is formed of a steel cord.
  • the steel cord can be made of, for example, steel monofilament or stranded wire.
  • the carcass 4 extends between the pair of bead portions 1c, more specifically between the bead cores 3a of the pair of bead members 3, and extends in a toroidal shape.
  • the carcass 4 has at least a radial structure.
  • the carcass 4 includes one or more carcass plies 4a in which carcass cords are arranged at an angle of, for example, 75 ° to 90 ° with respect to the tire circumferential direction C (see FIG. 1 and the like).
  • the carcass ply 4a includes a ply body portion positioned between the pair of bead cores 3a, and a ply folding portion that is folded from the inside to the outside in the tire width direction A around the bead core 3a at both ends of the ply body portion.
  • a bead filler 3b extending from the bead core 3a to the outer side in the tire radial direction B is disposed between the ply main body portion and the ply folded portion.
  • the carcass cord constituting the carcass ply 4a a polyester cord is adopted in this embodiment, but other than this, an organic fiber cord such as nylon, rayon, aramid, or a metal cord such as steel is adopted as necessary. Also good. Also, the number of carcass plies 4a may be two or more.
  • the resin annular body 5 is disposed in the tread portion 1a. Further, the resin annular body 5 includes reduced diameter portions 13 and 14 whose outer diameters are reduced toward the outer ends in the tire width direction A at both ends in the tire width direction A. Specifically, the outer surface in the tire radial direction B of the resin annular body 5 of the present embodiment has a barrel shape, and not only the end portion in the tire width direction A but also both sides in the tire width direction A sandwiching the tire equatorial plane CL.
  • the diameter-reducing portions 13 and 14 are configured. However, a resin annular body in which the reduced diameter portions 13 and 14 are provided only at the end portion in the tire width direction A may be used. Further, the reduced diameter portions 13 and 14 at the ends of the resin annular body 5 in the tire width direction A extend to the outside in the tire width direction A from the tread ends TE.
  • the end of the resin annular body in the tire width direction A means a portion in the tire width direction A that is separated from the tire equator plane CL by a distance of 1/4 of the tire ground contact width W.
  • the central portion of the resin annular body in the tire width direction A means a portion in the tire width direction A that is within a distance of 1/4 of the tire ground contact width W from the tire equatorial plane CL.
  • the “tire contact width” is a distance in the tire width direction between the tread ends TE in a state where the tire is mounted on the above-described applied rim, filled with the specified internal pressure, and in a no-load state.
  • the resin annular body 5 includes the reduced diameter portions 13 and 14 and the reduced diameter portions 13 and 14 are not provided and the inner diameter and the outer diameter are uniform, the position in the vicinity of the tread end TE.
  • it is possible to suppress the ground pressure from locally increasing and to suppress uneven wear on the outer surface of the tread.
  • it can suppress that a distortion concentrates on the edge part of the tire width direction A of the resin annular body 5.
  • FIG. Thereby, it can suppress that damage, such as a crack, arises in the edge part of the tire width direction A of the resin annular body 5.
  • the resin constituting the resin annular body 5 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 rearrangement can also be used.
  • the resin constituting the resin annular body 5 does not include rubber (an organic polymer substance exhibiting rubber elasticity at room temperature).
  • 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.
  • Particularly preferred are TPA, TPC, TPV, polyamide resin, polyester resin and blends thereof.
  • the elastic modulus of the resin annular body 5 can be set in the range of 100 MPa to 1000 MPa, more preferably in the range of 200 MPa to 700 MPa.
  • the elastic modulus of the resin annular body 5 means a tensile elastic modulus.
  • the tensile elastic modulus is measured according to JIS K7113: 1995. Specifically, using a Shimadzu Autograph AGS-J (5KN) manufactured by Shimadzu Corporation, the tensile modulus is set to 100 mm / min and the tensile elastic modulus is measured.
  • the measurement data may be adjusted by punching out from the resin annular body.
  • a measurement sample of the same material as the resin annular body is separately prepared and the elastic modulus is measured. May be.
  • the resin annular body 5 of the present embodiment extends in the tire width direction A to the outside of the resin-coated belt 6 described later.
  • the resin annular body 5 of the present embodiment is located inside the tire radial direction B of the resin-coated belt 6.
  • the resin annular body 5 does not include a cord. That is, no cord is arranged in the resin annular body 5.
  • the maximum thickness T1 of both ends of the resin annular body 5 in the tire width direction A is thicker than the maximum thickness T2 of the central part of the resin annular body 5 in the tire width direction A.
  • a resin annular body 5 whose thickness gradually increases from the center position in the tire width direction A intersecting the tire equatorial plane CL toward the outside in the tire width direction A is shown. ing.
  • the maximum thickness T1 at both ends in the tire width direction A of the resin annular body 5 of the present embodiment is the thickness at the position of the outer end in the tire width direction A.
  • the maximum thickness T2 of the central portion in the tire width direction A of the resin annular body 5 of the present embodiment is a thickness at a position adjacent to the end portion in the tire width direction A.
  • the resin annular body 5 While maintaining the weight reduction of the tire 1 without increasing the thickness of the center portion in the tire width direction A, the thickness of the end portion in the tire width direction A of the resin annular body 5 is increased, so that the tire of the resin annular body 5 is obtained. It can suppress that the diameter reduction parts 13 and 14 of the edge part of the width direction A are cracked by a ground pressure. That is, the durability of the resin annular body 5 can be improved while realizing the weight reduction of the tire 1 using the resin annular body 5.
  • the maximum thickness T1 of the end portion in the tire width direction A of the resin annular body 5 is set in the range of 0.1 mm to 3 mm, more preferably in the range of 0.3 mm to 2 mm. Further, the maximum thickness T2 of the central portion in the tire width direction A of the resin annular body 5 is set in the range of 0.1 mm to 2.5 mm, more preferably in the range of 0.2 mm to 1.5 mm.
  • the resin-coated belt 6 is disposed on the outer side in the tire radial direction B of the resin annular body 5 in the tread portion 1a.
  • the resin-coated belt 6 includes a cord 10b that is covered with a coating resin 10a.
  • the resin-coated belt 6 of the present embodiment has one or more layers (1 in the present embodiment) arranged on the outer side in the tire radial direction B with respect to the crown portion of the carcass 4 and the resin annular body 5. Layer) belt layer. More specifically, as shown in FIG. 1, the resin-coated belt 6 of the present embodiment is constituted by a circumferential belt 6a composed of only one circumferential belt layer.
  • a steel cord as a metal belt cord is 10 ° or less, preferably 5 ° or less, more preferably 5 ° or less with respect to the tire circumferential direction C (see FIG. 1 and the like). Is a spiral belt formed in a state of being spirally wound around the tire center axis at an angle of 2 ° or less. More specifically, the circumferential belt 6a as the resin-coated belt 6 of the present embodiment is formed by a resin-coated cord 10 made of a cord 10b such as a steel cord coated with a coating resin 10a.
  • the circumferential belt 6a as the resin-coated belt 6 extends between the reduced diameter portions 13 and 14 at both ends in the tire width direction A of the resin annular body 5 on the outer surface of the resin annular body 5 in the tire radial direction B.
  • the resin-coated cord 10 is wound around the outer surface of the resin annular body 5 in the tire radial direction B while being joined to the outer surface of the resin annular body 5 in the tire radial direction B.
  • the resin-coated cord 10 and the resin annular body 5 are joined by welding the coating resin 10 a of the resin-coated cord 10 and the resin annular body 5.
  • the coating resin 10a of the resin coating cord 10 and the resin annular body 5 are not limited to welding, and may be joined by bonding with an adhesive or the like.
  • the resin-coated cord 10 of the present embodiment is joined at adjacent portions in the tire width direction A.
  • the parts adjacent to the tire width direction A of the resin-coated cord 10 are joined together by welding the coating resin 10a.
  • the portions adjacent to the tire width direction A of the resin-coated cord 10 are not limited to welding, and may be joined by bonding with an adhesive or the like.
  • the portions adjacent to each other in the tire width direction A of the resin-coated cord 10 spirally wound around the resin annular body 5 are at least the positions of the reduced diameter portions 13 and 14 of the resin annular body 5 in the tire width direction A. It is preferable to adopt a configuration in which the two are joined. As described above, the diameter-reduced portions 13 and 14 of the annular resin body 5 are easily strained due to the contact pressure and easily damaged. Therefore, the ground pressure can be distributed over a wider range of the resin annular body 5 through the resin-coated belt 6 by joining the portions of the resin-coated cord 10 adjacent to each other in the tire width direction A. As a result, it is possible to suppress strain from concentrating on the reduced diameter portions 13 and 14 of the resin annular body 5, and the durability of the resin annular body 5 can be further improved.
  • the portions adjacent to each other in the tire width direction A of the resin-coated cord 10 spirally wound around the resin annular body 5 are the reduced diameter portion 13 of the resin annular body 5 in the tire width direction A and Not only the position 14 but also the entire region in the tire width direction A is joined.
  • the resin-coated belt 6 of the present embodiment has a substantially constant thickness regardless of the position in the tire width direction A.
  • the thickness of the resin-coated belt 6 of the present embodiment can be set, for example, in the range of 1.5 mm to 7 mm, more preferably in the range of 2 mm to 5 mm.
  • the elastic modulus of the coating resin 10a of the resin-coated belt 6 can be set in the range of 100 MPa to 1000 MPa, more preferably in the range of 200 MPa to 700 MPa.
  • the tensile elastic modulus is measured according to JIS K7113: 1995.
  • the tensile modulus is set to 100 mm / min and the tensile elastic modulus is measured.
  • the measurement data may be adjusted by punching out from the coating resin if possible.For example, a measurement sample of the same material as the coating resin is prepared separately and the elastic modulus is measured. May be.
  • the resin-coated cord 10 of the present embodiment includes two steel cords, but may be a resin-coated cord including only one steel cord, or a resin including three or more steel cords. It is good also as a covering cord.
  • the cord 10b can be any known material, for example, the above-described steel cord can be used.
  • the steel cord can be made of, for example, steel monofilament or stranded wire.
  • the cord 10b can also use organic fiber, carbon fiber, or those strands.
  • 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).
  • thermoplastic resin examples 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 10a that covers the cord 10b is preferably 50 MPa or more.
  • the tensile modulus of the coating resin 10a that covers the cord 10b is preferably 1000 MPa or less.
  • the coating resin 10a here does not include rubber (an organic polymer substance exhibiting rubber elasticity at room temperature).
  • the tread rubber 7 constitutes an outer surface of the tread portion 1a in the tire radial direction B (hereinafter referred to as “tread outer surface”), and the tread outer surface of the present embodiment has a tire circumferential direction C (see FIG. 1), a tread pattern including a circumferential groove 7a extending in the tire width direction A and a width direction groove (not shown) extending in the tire width direction A is formed.
  • the side rubber 8 constitutes the outer surface of the sidewall portion 1b in the tire width direction A, and is formed integrally with the tread rubber 7 described above.
  • the inner liner 9 is laminated on the inner surface of the carcass 4 and is formed of butyl rubber having low air permeability in the present embodiment.
  • the butyl rubber means butyl rubber and halogenated butyl rubber which is a derivative thereof.
  • the minimum thickness T3 of the resin annular body 5 of the present embodiment is preferably 80% or more of the maximum thickness T1 of the resin annular body 5, and preferably 90% or more. Is more preferable.
  • the minimum thickness T3 of the present embodiment means the thickness of the resin annular body 5 at the center position in the tire width direction A that intersects the tire equatorial plane CL.
  • the thickness of the resin annular body 5 is preferably in the range of 0.1 mm to 3.0 mm.
  • the minimum thickness T3 of the resin annular body 5 is preferably 0.1 mm or more
  • the maximum thickness T1 of the resin annular body 5 is preferably 3.0 mm or less.
  • FIG. 2 is an enlarged cross-sectional view showing an enlarged central portion in the tire width direction A of the resin annular body 5 shown in FIG.
  • the resin annular body 5 of the present embodiment is formed by joining a resin-made first annular portion 5 a and a resin-made second annular portion 5 b in the vicinity of the tire equatorial plane CL.
  • an annular end surface 11 on one side in the tire width direction A of the first annular portion 5a and an annular end surface 12 on the other side in the tire width direction A of the second annular portion 5b are provided.
  • the resin annular body 5 of the present embodiment has a seam formed by joining at a predetermined position in the tire width direction A.
  • the configuration is not limited to such a seam.
  • FIG. 3 is a view showing a resin annular body 305 as a modified example of the resin annular body 5 of the present embodiment.
  • the resin annular body 305 shown in FIG. 3 is an integrally molded product in which no seam is formed in the tire width direction A.
  • the manufacturing method of such a resin annular body 305 can utilize, for example, injection molding or blow molding, but the manufacturing method is not particularly limited.
  • the resin annular body 5 whose thickness gradually increases from the center position in the tire width direction A intersecting the tire equatorial plane CL toward the outside in the tire width direction A is shown.
  • the configuration is not particularly limited as long as the maximum thickness T1 of both end portions of A is thicker than the maximum thickness T2 of the central portion in the tire width direction A of the resin annular body.
  • FIG. 4 is a view showing a resin annular body 105 as a modified example of the resin annular body 5. Also in the resin annular body 105 shown in FIG. 4, the maximum thickness T ⁇ b> 1 at both ends in the tire width direction A is thicker than the maximum thickness T ⁇ b> 2 at the center in the tire width direction A of the resin annular body 105. In the resin annular body 105 shown in FIG. 4, the central portion in the tire width direction A is formed with a substantially constant thickness. Further, in the resin annular body 105 shown in FIG. 4, both end portions in the tire width direction A are formed with a substantially constant thickness different from the thickness of the central portion. Therefore, the maximum thickness T1 at both ends in the tire width direction A of the resin annular body 105 shown in FIG.
  • the maximum thickness T2 of the central portion in the tire width direction A of the resin annular body 105 shown in FIG. 4 is the thickness at an arbitrary position of the central portion in the tire width direction A.
  • a stepped surface extending toward the inner surface of the tire is formed on the inner surface of the resin annular body 105 in the tire radial direction B. The inner surface of the end portion in the tire width direction A of the resin annular body 105 and the inner surface of the center portion in the tire width direction A of the resin annular body 105 are connected via the above-described step surface.
  • FIG. 5 is a view showing a resin annular body 205 as another modified example of the resin annular body 5. Also in the resin annular body 205 shown in FIG. 5, the maximum thickness T ⁇ b> 1 at both ends in the tire width direction A is thicker than the maximum thickness T ⁇ b> 2 at the center in the tire width direction A of the resin annular body 205. In the resin annular body 205 shown in FIG. 5, the central portion in the tire width direction A is formed with a substantially constant thickness, but both end portions in the tire width direction A are thicker toward the outer ends in the tire width direction A. Is configured to increase gradually. Therefore, the maximum thickness T1 of both end portions in the tire width direction A of the resin annular body 205 shown in FIG.
  • the thickness at the position of the outer end in the tire width direction A is the thickness at the position of the outer end in the tire width direction A. Further, the maximum thickness T2 of the central portion in the tire width direction A of the resin annular body 205 shown in FIG. 5 is the thickness at an arbitrary position of the central portion in the tire width direction A.
  • a step surface, a corner, or the like is not formed on the inner surface and the outer surface in the tire radial direction B. . If it does in this way, resin annular bodies 5 and 205 will be easy to stick to a member which adjoins in tire diameter direction B, and it can control that failure, such as separation, occurs between adjacent members.
  • the resin annular bodies 5, 105, 205 and 305 shown in FIGS. 1 and 3 to 5 have a barrel-shaped outer shape, but there are reduced diameter portions only at both ends in the tire width direction A.
  • the central portion in the tire width direction A may be a resin annular body configured by a cylindrical portion having a uniform inner diameter and outer diameter.
  • the present invention relates to a pneumatic tire.

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  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

La présente invention concerne un bandage pneumatique qui comporte sur sa section de bande de roulement : un corps annulaire en résine pourvu de sections de diamètre réduit qui sont situées au niveau des deux sections d'extrémité de celui-ci dans le sens de la largeur du bandage et qui ont un diamètre externe décroissant vers des extrémités externes dans la direction de la largeur du bandage ; et une ceinture revêtue de résine qui est constituée d'un cordon revêtu de résine comprenant un cordon revêtu d'une résine de revêtement, le cordon revêtu de résine étant formé entre les sections de diamètre réduit au niveau des deux sections d'extrémité du corps annulaire en résine dans le sens de la largeur du bandage de telle sorte que le cordon revêtu de résine est enroulé en hélice sur la surface externe du corps annulaire en résine dans la direction radiale du bandage. La ceinture revêtue de résine est jointe au corps annulaire en résine, et l'épaisseur maximale des deux sections d'extrémité du corps annulaire en résine dans la direction de la largeur du bandage est supérieure à l'épaisseur maximale de la section centrale du corps annulaire en résine dans la direction de la largeur du bandage.
PCT/JP2019/021237 2018-05-31 2019-05-29 Bandage pneumatique WO2019230772A1 (fr)

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JP2018105491A JP2019209750A (ja) 2018-05-31 2018-05-31 空気入りタイヤ
JP2018-105491 2018-05-31

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06255314A (ja) * 1993-03-08 1994-09-13 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JPH1035220A (ja) * 1996-07-23 1998-02-10 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
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
JP2006069390A (ja) * 2004-09-02 2006-03-16 Bridgestone Corp 高速重荷重用空気入りラジアルタイヤ
WO2017200061A1 (fr) * 2016-05-20 2017-11-23 株式会社ブリヂストン Pneu
WO2018012640A1 (fr) * 2016-07-15 2018-01-18 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
JPH06255314A (ja) * 1993-03-08 1994-09-13 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JPH1035220A (ja) * 1996-07-23 1998-02-10 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
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
JP2006069390A (ja) * 2004-09-02 2006-03-16 Bridgestone Corp 高速重荷重用空気入りラジアルタイヤ
WO2017200061A1 (fr) * 2016-05-20 2017-11-23 株式会社ブリヂストン Pneu
WO2018012640A1 (fr) * 2016-07-15 2018-01-18 株式会社ブリヂストン Pneu

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