WO2020090982A1 - Pneu - Google Patents

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Publication number
WO2020090982A1
WO2020090982A1 PCT/JP2019/042840 JP2019042840W WO2020090982A1 WO 2020090982 A1 WO2020090982 A1 WO 2020090982A1 JP 2019042840 W JP2019042840 W JP 2019042840W WO 2020090982 A1 WO2020090982 A1 WO 2020090982A1
Authority
WO
WIPO (PCT)
Prior art keywords
bead
tire
plate portion
radial direction
bead core
Prior art date
Application number
PCT/JP2019/042840
Other languages
English (en)
Japanese (ja)
Inventor
福島　敦
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 WO2020090982A1 publication Critical patent/WO2020090982A1/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
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • 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
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead

Definitions

  • the present invention relates to a tire in which a part of a bead portion is made of a resin material.
  • Patent Document 1 a tire in which a resin plate is provided in a bead portion has been known for the purpose of improving steering stability of a vehicle.
  • a resin plate is provided on the outside of the bead core in the tire width direction.
  • an object of the present invention is to provide a tire that is capable of achieving both suppression of weight increase and steering stability at a higher level.
  • a tread portion that is in contact with a road surface, a tire side portion that is continuous with the tread portion, is located on a tire radial direction inner side of the tread portion, and is connected with the tire side portion, and a tire diameter of the tire side portion.
  • a tire including an annular bead portion located on the inner side in the direction, wherein the bead portion includes a bead structure having a bead core in which a bead cord is covered with a resin material, and the bead structure is formed of a resin material.
  • the plate portion is formed, the plate portion is continuous with the bead core, and extends outward in the tire radial direction.
  • FIG. 1 is a sectional view of a pneumatic tire 10.
  • FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10.
  • FIG. 3 is an enlarged cross-sectional view of the bead portion 60.
  • FIG. 4 is an enlarged cross-sectional view of the bead portion 60 according to the modification.
  • FIG. 5 is an enlarged cross-sectional view of a bead portion 60 according to another modification.
  • FIG. 1 is a sectional view of a pneumatic tire 10 according to the present embodiment. Specifically, FIG. 1 is a cross-sectional view of the pneumatic tire 10 taken along the tire width direction and the tire radial direction. In FIG. 1, cross-sectional hatching is omitted (the same applies below).
  • the pneumatic tire 10 includes a tread portion 20, a tire side portion 30, a carcass ply 40, a belt layer 50 and a bead portion 60.
  • the tread part 20 is a part that contacts the road surface (not shown).
  • the tread portion 20 is formed with a pattern (not shown) according to the usage environment of the pneumatic tire 10 and the type of vehicle to which the pneumatic tire 10 is attached.
  • Tire side part 30 is connected to the tread part 20 and is located inside the tire radial direction of the tread part 20.
  • the tire side portion 30 is an area from the tire width direction outer end of the tread portion 20 to the upper end of the bead portion 60.
  • the tire side portion 30 is sometimes called a sidewall or the like.
  • the carcass ply 40 forms the skeleton of the pneumatic tire 10.
  • the carcass ply 40 has a radial structure in which carcass cords (not shown) radially arranged along the tire radial direction are covered with a rubber material.
  • the structure is not limited to the radial structure, and may be a bias structure in which the carcass cords are arranged so as to intersect in the tire radial direction.
  • the carcass cord is not particularly limited, and may be formed of an organic fiber cord similarly to a tire for a general passenger car.
  • the belt layer 50 is provided inside the tread portion 20 in the tire radial direction.
  • the belt layer 50 is a single-layer spiral belt having a reinforcing cord 51, and the reinforcing cord 51 is covered with a resin.
  • the belt layer 50 is not limited to the single-layer spiral belt.
  • the belt layer 50 may be a two-layer cross belt covered with rubber.
  • a resin material having a higher tensile elastic modulus than the rubber material forming the tire side portion 30 and the rubber material forming the tread portion 20 is used for the resin that covers the reinforcing cord 51.
  • a resin covering the reinforcing cord 51 a thermoplastic resin having elasticity, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used. Considering elasticity during running and moldability during manufacturing, it is desirable to use a thermoplastic elastomer.
  • thermoplastic elastomers include polyolefin thermoplastic elastomer (TPO), polystyrene thermoplastic elastomer (TPS), polyamide thermoplastic elastomer (TPA), polyurethane thermoplastic elastomer (TPU), polyester thermoplastic elastomer (TPC). , Dynamically crosslinked thermoplastic elastomer (TPV) and the like.
  • thermoplastic resin examples include polyurethane resin, polyolefin resin, vinyl chloride resin, and polyamide resin.
  • the deflection temperature under load (at 0.45MPa load) specified by ISO75-2 or ASTM D648 is 78 ° C or more
  • the tensile yield strength specified by JIS K7113 is 10MPa or more.
  • a material having a tensile elongation at break of 50% or more specified in JIS K7113 and a Vicat softening temperature (A method) of 130 ° C or more specified in JIS K7206 can be used.
  • the bead portion 60 is connected to the tire side portion 30 and is located inside the tire side portion 30 in the tire radial direction.
  • the bead portion 60 has an annular shape extending in the tire circumferential direction.
  • a part of the bead portion 60 is made of a resin material appropriately selected from the above resin materials.
  • a part of the bead portion 60 is formed of the same resin material as that used for the belt layer 50 described above.
  • the bead portion 60 is locked to a flange portion 110 (not shown in FIG. 1, see FIG. 2) formed at the radially outer end of the rim wheel 100.
  • an inner liner (not shown) that prevents the air (or a gas such as nitrogen) filled in the internal space of the pneumatic tire 10 assembled to the rim wheel 100 from leaking is provided on the inner surface of the pneumatic tire 10. It is pasted.
  • FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10. Specifically, FIG. 2 is a partially enlarged sectional view of the pneumatic tire 10 including the bead portion 60 along the tire width direction and the tire radial direction.
  • the carcass ply 40 is folded back to the outside in the tire width direction via the bead portion 60.
  • the carcass ply 40 includes a body portion 41 and a folded portion 42.
  • the body portion 41 is provided over the tread portion 20, the tire side portion 30, and the bead portion 60, and is folded back at the bead portion 60, specifically, the bead core 62 (not shown in FIG. 2, see FIG. 3). Part of.
  • the folded-back portion 42 is a portion that is continuous with the main body portion 41 and is folded back to the outside in the tire width direction via the bead core 62.
  • the bead portion 60 includes a bead structure 61 having a bead core 62.
  • a bead filler 63 is provided outside the bead core 62 in the tire radial direction.
  • the bead filler 63 is provided so as to fill the space between the main body portion 41 of the carcass ply 40 and the folded-back portion 42.
  • the bead structure 61 has an L shape (or an inverted L shape), that is, a hook shape, in a cross-sectional view along the tire width direction and the tire radial direction of the pneumatic tire 10.
  • the bead structure 61 and the bead filler 63 are located inside the rim line 90 in the tire radial direction.
  • FIG. 3 is an enlarged sectional view of the bead section 60. Specifically, FIG. 3 is an enlarged cross-sectional view of the bead portion 60 along the tire width direction and the tire radial direction of the pneumatic tire 10.
  • the bead structure 61 has a bead core 62 and a plate portion 64.
  • the bead core 62 is formed by coating a bead cord 62a made of a metal material (for example, steel) with a resin material. That is, the bead core 62 is formed using a metal material.
  • the bead core 62, specifically, the bead cord 62a may be formed of an organic fiber, a carbon fiber or an inorganic fiber instead of a metal material.
  • the plate portion 64 is formed integrally with the bead core 62. That is, the plate portion 64 is continuous with the bead core 62 and extends outward in the tire radial direction.
  • the plate portion 64 is also made of a resin material.
  • the resin material used for the bead core 62 and the plate portion 64 may be the same as the resin material used for the belt layer 50.
  • the bead core 62 and the plate portion 64 do not necessarily have to be formed of the same resin material as that used for the belt layer 50. That is, the resin materials used for the belt layer 50, the bead core 62, and the plate portion 64 may be different as long as they are the above-mentioned resin materials that can be used for the belt layer 50.
  • the plate portion 64 extends outward in the tire radial direction from either end of the bead core 62 in the tire width direction. In the present embodiment, the plate portion 64 extends from the end portion of the bead core 62 on the outer side in the tire width direction to the outer side in the tire radial direction.
  • the plate portion 64 has an annular shape extending along the tire circumferential direction.
  • the plate portion 64 has a flat plate shape with a substantially constant thickness.
  • the bead filler 63 is a separate body from the bead structure 61 and is provided on the side of the plate portion 64. Further, the folded portion 42 of the carcass ply 40 extends to the side of the plate portion 64.
  • the bead filler 63 is provided on the side of the plate portion 64 on the inner side in the tire width direction. Further, the folded-back portion 42 extends to the side of the plate portion 64. Specifically, the folded-back portion 42 extends to the outside of the plate portion 64 in the tire width direction.
  • the end portion 42a of the folded-back portion 42 is located outside the plate portion 64 in the tire radial direction. That is, the end portion 42a is located on the outer side in the tire radial direction with respect to the outer end in the tire radial direction of the plate portion 64.
  • the bead core 62 is formed by coating the bead cord 62a with a resin material. Thereby, the weight increase can be suppressed more than the bead core which covers the bead cord 62a using the conventional rubber material.
  • the bead structure 61 has a plate portion 64 formed of a resin material.
  • the plate portion 64 is continuous with the bead core 62 and extends outward in the tire radial direction.
  • Such a plate portion 64 is continuous with the bead core 62 and integrated, and functions as a reinforcing member for the bead portion 60. Therefore, it contributes to the improvement of the steering stability of the vehicle in which the pneumatic tire 10 is mounted.
  • the plate portion 64 extends from the end portion of the bead core 62 on the outer side in the tire width direction to the outer side in the tire radial direction. Therefore, the plate portion 64 can be provided at a position apart from the main body portion 41 of the carcass ply 40, and the rigidity of the bead portion 60 as a whole can be easily increased. This can further improve the steering stability.
  • the bead filler 63 is provided on the side of the plate portion 64. Therefore, the bead structure 61 having the plate portion 64 and the bead filler 63 can integrally function as a reinforcing member for the bead portion 60. This can further improve the steering stability.
  • the folded portion 42 of the carcass ply 40 extends to the side of the plate portion 64. Therefore, the plate portion 64 and the folded portion 42 can be brought into close contact with each other, and the rigidity of the bead portion 60 can be further improved. This can further improve the steering stability.
  • FIG. 4 is an enlarged cross-sectional view of the bead portion 60 according to the modification. Specifically, FIG. 4 is an enlarged cross-sectional view of the bead portion 60 of the pneumatic tire 10 along the tire width direction and the tire radial direction.
  • the bead structure 61A has a plate portion 64A.
  • the plate portion 64A extends from the end portion of the bead core 62 on the inner side in the tire width direction to the outer side in the tire radial direction.
  • the plate portion 64A is provided so as to be inclined along the side surface of the bead filler 63 according to the shape of the bead portion 60.
  • the bead structure 63 may be assembled more easily than the bead structure 61.
  • the bead structure 61 is easier to enhance the steering stability than the bead structure 61A.
  • FIG. 5 is an enlarged sectional view of a bead portion 60 according to another modification. Specifically, FIG. 5 is an enlarged cross-sectional view of the bead portion 60 along the tire width direction and the tire radial direction of the pneumatic tire 10.
  • the bead structure 61B and the plate portion 64B are formed separately. Since the bead structure 61B and the plate portion 64B are both made of a resin material, they may be bonded with an adhesive or may be welded in the vulcanization step.
  • bead filler 63 may be adhered or welded to the bead structure 61B without being limited to the above-described modified example.
  • the bead filler 63 may be omitted depending on the type and size of the pneumatic tire 10. Furthermore, the carcass ply 40 does not have to be largely folded back via the bead core 62, and the end portion 42a of the folded-back portion 42 may be located near the bead core 62.

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

Abstract

La partie de talon (60) d'un pneumatique (10) comprend une structure de talon (61) ayant un noyau de talon (62) obtenu en recouvrant un cordon de talon avec un matériau de résine. La structure de talon (61) a une partie de plaque (64) formée à partir d'un matériau de résine. La partie de plaque (64) est continue avec le noyau de talon (62) et s'étend vers l'extérieur dans la direction radiale du pneu.
PCT/JP2019/042840 2018-10-31 2019-10-31 Pneu WO2020090982A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-204719 2018-10-31
JP2018204719A JP2020069889A (ja) 2018-10-31 2018-10-31 タイヤ

Publications (1)

Publication Number Publication Date
WO2020090982A1 true WO2020090982A1 (fr) 2020-05-07

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ID=70464518

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/042840 WO2020090982A1 (fr) 2018-10-31 2019-10-31 Pneu

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JP (1) JP2020069889A (fr)
WO (1) WO2020090982A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6325110A (ja) * 1986-07-09 1988-02-02 ミシュラン、エ、コンパニ−、（コンパニ−、ゼネラ−ル、デ、ゼタブリスマン、ミシュラン） タイヤ外皮用の被覆部を有するビ−ドワイヤおよびこのビ−ドワイヤの製造法
JP2011235835A (ja) * 2010-05-13 2011-11-24 Yokohama Rubber Co Ltd:The 空気入りタイヤ
WO2013089111A1 (fr) * 2011-12-12 2013-06-20 株式会社ブリヂストン Pneumatique
JP2014234074A (ja) * 2013-06-03 2014-12-15 住友ゴム工業株式会社 空気入りタイヤ
WO2016017508A1 (fr) * 2014-07-30 2016-02-04 株式会社ブリヂストン Pneu

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6325110A (ja) * 1986-07-09 1988-02-02 ミシュラン、エ、コンパニ−、（コンパニ−、ゼネラ−ル、デ、ゼタブリスマン、ミシュラン） タイヤ外皮用の被覆部を有するビ−ドワイヤおよびこのビ−ドワイヤの製造法
JP2011235835A (ja) * 2010-05-13 2011-11-24 Yokohama Rubber Co Ltd:The 空気入りタイヤ
WO2013089111A1 (fr) * 2011-12-12 2013-06-20 株式会社ブリヂストン Pneumatique
JP2014234074A (ja) * 2013-06-03 2014-12-15 住友ゴム工業株式会社 空気入りタイヤ
WO2016017508A1 (fr) * 2014-07-30 2016-02-04 株式会社ブリヂストン Pneu

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JP2020069889A (ja) 2020-05-07

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