WO2020090983A1 - Pneumatique - Google Patents

Pneumatique Download PDF

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Publication number
WO2020090983A1
WO2020090983A1 PCT/JP2019/042841 JP2019042841W WO2020090983A1 WO 2020090983 A1 WO2020090983 A1 WO 2020090983A1 JP 2019042841 W JP2019042841 W JP 2019042841W WO 2020090983 A1 WO2020090983 A1 WO 2020090983A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
bead
bead core
width direction
carcass ply
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/JP2019/042841
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English (en)
Japanese (ja)
Inventor
圭一 長谷川
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 WO2020090983A1 publication Critical patent/WO2020090983A1/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
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • 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
    • 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
    • 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
    • B60C9/02—Carcasses

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 resin is filled in the void portion of the bead core is known (see Patent Document 1).
  • a bead core in which a bead cord is covered with a resin material and a resin-made bead filler integrally molded with a filler-integrated resin bead core.
  • the present invention has been made in view of such a situation, without deteriorating the yield, a bead core in which a bead cord is coated with a resin, and a resin-made bead filler are integrally molded.
  • An object is to provide a tire using a resin bead core.
  • 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 a bead portion located on the inner side in the direction, including a carcass ply forming a skeleton of the tire, the bead portion being a bead core in which a bead cord is covered with a resin material, and being continuous with the bead core, a resin material A bead filler formed by, and an annular ring extending in the tire circumferential direction, including an annular plate formed of a resin material, the annular plate is provided on the tire width direction inner side of the carcass ply, the tire In a cross section along the width direction and the tire radial direction, the bead core is a tire diameter of the bead core.
  • An end portion of the carcass ply which has a first end portion that is an end portion on the inner side in the tire width direction and a second end portion that is an end portion on the tire radial direction outer side and the tire width direction outer side of the bead core. Is located between the first end and the second end.
  • 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 a schematic perspective view of the annular plate 80 alone.
  • FIG. 5 is a schematic perspective view of the annular plate 80A alone.
  • FIG. 6 is a schematic perspective view of the annular plate 80B alone.
  • FIG. 7 is an enlarged cross-sectional view of the bead portion 60 according to the 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 bead portion 60 of the present embodiment includes a resin bead core (integrated resin bead core) in which a bead core and a bead filler are integrally molded.
  • the bead portion 60 includes a bead core portion 61 and a bead filler portion 62. Further, the bead portion 60 includes an annular plate 80.
  • the bead core portion 61 (excluding a bead cord 61a described later) and the bead filler portion 62 are made of the same resin material as that used for the belt layer 50.
  • the annular plate 80 is an annular plate extending in the tire circumferential direction.
  • the annular plate 80 is also made of the same resin material as that used for the belt layer 50.
  • the bead portion 60 (the bead core portion 61 and the bead filler portion 62) and the annular plate 80 do not necessarily have to be formed of the same resin material as that used for the belt layer 50. That is, if the above-described resin material that can be used for the belt layer 50, the resin material used for the belt layer 50, the bead portion 60 (the bead core portion 61 and the bead filler portion 62), and the annular plate 80 are different. May be.
  • the carcass ply 40 is provided inside the bead core portion 61 and the bead filler portion 62 in the tire width direction along the bead core portion 61 and the bead filler portion 62. Further, the carcass ply 40 is folded back along the tire radial inner surface of the bead core portion 61.
  • the end portion 41 of the carcass ply 40 slightly projects to the outside of the bead core portion 61 in the tire width direction. That is, the carcass ply 40 is in a form in which there is almost no folded portion that is folded back from the tire width direction inner side to the tire width direction outer side via the bead core portion 61.
  • the annular plate 80 is provided inside the carcass ply 40 in the tire width direction. Specifically, the annular plate 80 is vulcanized and adhered to the inner surface of the carcass ply 40 in the tire width direction using an adhesive resin.
  • an adhesive resin a thermoplastic resin, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used.
  • 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 core portion 61 has a bead cord 61a formed of a metal material (for example, steel) and a coating resin 61b for coating the outer peripheral portion of the bead cord 61a.
  • the bead core portion 61 is formed by coating the bead cord 61a with a resin material.
  • the bead cord 61a is provided so as to have a configuration of 3x3 (tire radial direction x tire width direction) in a cross section along the tire width direction and the tire radial direction of the pneumatic tire 10.
  • the bead cord 61a is not particularly twisted, and one or more bead cords 61a (for example, three bundles along the tire width direction) are wound around the tire circumferential direction a plurality of times. ing.
  • the bead filler portion 62 is continuous with the bead core portion 61. That is, the bead core portion 61 and the bead filler portion 62 are integrally molded. Specifically, the bead filler portion 62 is provided outside the bead core portion 61 in the tire radial direction.
  • the bead core portion 61 has a quadrangular shape, specifically a square shape, and has a first end 71, a second end 72, and a third end 73.
  • the first end portion 71 is an end portion on the tire radial direction inner side and the tire width direction inner side of the bead core portion 61.
  • the second end 72 is an end of the bead core portion 61 on the tire radial direction outer side and the tire width direction outer side.
  • the third end portion 73 is an end portion on the tire radial direction inner side and the tire width direction outer side of the bead core portion 61.
  • At least the first end portion 71 and the third end portion 73 located on the tire radial inner side of the bead core portion 61 are preferably chamfered in a round shape so that corner portions are not formed.
  • the bead core portion 61 and the bead filler portion 62 are integrally molded, but in this case, the tire radial outer end of the bead core portion 61 is the bead located at the outermost tire radial direction. The position of the outer end of the cord 61a in the radial direction of the tire is used as a reference.
  • the end 41 of the carcass ply 40 is located between the first end 71 and the second end 72. In addition, in the present embodiment, the end 41 of the carcass ply 40 is located between the second end 72 and the third end 73.
  • the annular plate 80 is provided across the bead core portion 61 and the bead filler portion 62 in the tire radial direction. Specifically, the annular plate 80 is provided at a position corresponding to the bead core portion 61 and the bead filler portion 62 in the tire radial direction, and is vulcanized and bonded to the tire width direction inner side surface of the carcass ply 40 at the position. Has been done.
  • the tire radial outer end 62a of the bead filler portion 62 is located on the tire radial inner side of the rim line 90.
  • the tire radial outer end 62a is located on the tire radial inner side of the tire radial outer end of the flange portion 110.
  • FIG. 4 is a schematic perspective view of the annular plate 80 included in the bead portion 60 of the pneumatic tire 10 alone.
  • the annular plate 80 is bonded to the inner surface of the carcass ply 40 in the tire width direction during the vulcanization process of the pneumatic tire 10.
  • the unit shape of the annular plate 80 shown in FIG. 4 is bent to follow the shapes of the bead core portion 61 and the bead filler portion 62.
  • the annular plate 80 may have a simple flat plate shape. In this case, the annular plate 80 is bent so as to follow the shapes of the bead core portion 61 and the bead filler portion 62 in the vulcanization process of the pneumatic tire 10.
  • FIG. 5 is a schematic perspective view of the annular plate 80A alone.
  • a large number of holes 82 are formed in the annular plate 80A.
  • the number and diameter size of the holes 82 are determined in consideration of the performance required for the annular plate.
  • FIG. 6 is a schematic perspective view of a single unit of the annular plate 80B. As shown in FIG. 6, the annular plate 80B is formed with a wavy portion 83 that repeats a wavy shape along the circumferential direction of the annular plate 80B.
  • the following operation / effect can be obtained.
  • the end 41 of the carcass ply 40 is located between the first end 71 and the second end 72. More specifically, the end 41 of the carcass ply 40 is located between the second end 72 and the third end 73.
  • the annular plate 80 formed of the resin material is provided inside the tire width direction of the carcass ply 40, the annular plate 80, the bead core portion 61, and the bead filler portion 62 are integrated after vulcanization.
  • the carcass ply 40 can be sandwiched and held by the formed integrated resin bead core, and the movement of the carcass ply 40 is restricted. For this reason, it is possible to prevent the end portion 41 of the carcass ply 40 arranged inside the bead core portion 61 in the tire radial direction from coming off and the carcass ply 40 from being fretting.
  • the annular plate 80 is provided across the bead core portion 61 and the bead filler portion 62 in the tire radial direction. Specifically, the annular plate 80 is provided at a position corresponding to the bead core portion 61 and the bead filler portion 62 in the tire radial direction, and is bonded to the tire width direction inner side surface of the carcass ply 40 at the position. There is.
  • the carcass ply 40 can be more reliably restrained by the bead core portion 61, the bead filler portion 62, and the annular plate 80. As a result, it is possible to more reliably prevent the carcass ply 40 from coming off and the carcass ply 40 from being fretting.
  • the annular plate 80 may have a shape such as the annular plate 80A (FIG. 5) and the annular plate 80B (FIG. 6). That is, the annular plate can be formed into an optimum shape depending on the required performance such as weight reduction, adhesiveness, durability and the like.
  • the end portion 41 of the carcass ply 40 is located between the second end portion 72 and the third end portion 73 (see FIG. 3), but the arrangement of the carcass ply 40 is It may be changed as follows.
  • FIG. 7 is an enlarged cross-sectional view of the bead portion 60 according to the modification. Specifically, FIG. 7 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 end portion 41 of the carcass ply 40A may be located between the first end portion 71 and the third end portion 73 of the bead core portion 61. That is, the end portion 41 does not necessarily have to be located between the second end portion 72 and the third end portion 73 of the bead core portion 61 as in the above-described embodiment, and the tire diameter of the bead core portion 61 is not required. It may be located between the end portion on the inner side in the tire width direction and the end portion on the inner side in the tire radial direction and the outer end in the tire width direction of the bead core portion 61.
  • the bead core portion 61 has a square cross section, but the bead core portion 61 may have a rectangular or trapezoidal cross section.
  • the bead core portion 61 may be a pentagon or more polygon (convex polygon). Note that a polygon such as a rhombus whose apex is located on a straight line parallel to the tire radial direction may not be included.
  • the bead cord 61a is continuous with the bead core portion 61 and the bead core portion coated with the resin material, and the bead filler portion 62 formed of the resin material means that the resin material may be the main constituent. .. That is, at least one of the bead core portion 61 (excluding the bead cord 61a) and the bead filler portion 62 may be mainly composed of a resin material, and a part thereof is formed of another material such as a rubber material. Good.
  • the bead core portion 61 and the bead filler portion 62 are integrally formed, but the bead core and the bead filler may be separate bodies.

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

Abstract

L'invention concerne une section de talon (60) d'un pneu (10) comprenant une partie noyau de talon (61) dans laquelle un noyau de talon (61a) est recouvert d'un matériau de résine, une partie bourrage de talon (62) qui est continue avec la partie noyau de talon (61) et est formée à partir d'un matériau de résine, et une plaque en forme d'anneau circulaire (80) qui est une forme d'anneau circulaire s'étendant dans la direction de la circonférence du pneu et est formée à partir d'un matériau de résine. La plaque en forme d'anneau circulaire (80) est disposée dans la direction de la largeur du pneu à l'intérieur d'un pli de carcasse (40). La partie noyau de talon (61) a une première section d'extrémité (71) qui est une section d'extrémité au niveau de la direction de rayon de pneu à l'intérieur et de la direction de largeur de pneu à l'intérieur de la partie noyau de talon (61), et une seconde section d'extrémité (72) qui est une section d'extrémité au niveau de la direction de rayon de pneu à l'extérieur et de la direction de largeur de pneu à l'extérieur de la partie noyau de talon (61). Une section d'extrémité (41) du pli de carcasse (40) est située entre la première section d'extrémité (71) et la seconde section d'extrémité (72).
PCT/JP2019/042841 2018-10-31 2019-10-31 Pneumatique Ceased WO2020090983A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018205121A JP2020069905A (ja) 2018-10-31 2018-10-31 タイヤ
JP2018-205121 2018-10-31

Publications (1)

Publication Number Publication Date
WO2020090983A1 true WO2020090983A1 (fr) 2020-05-07

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PCT/JP2019/042841 Ceased WO2020090983A1 (fr) 2018-10-31 2019-10-31 Pneumatique

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WO (1) WO2020090983A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004181911A (ja) * 2002-12-06 2004-07-02 Yokohama Rubber Co Ltd:The 空気入りタイヤの製造方法
JP2013500197A (ja) * 2009-07-30 2013-01-07 コンパニー ゼネラール デ エタブリッスマン ミシュラン 補強ビードを備えた重車両用タイヤ
JP2013500198A (ja) * 2009-07-30 2013-01-07 コンパニー ゼネラール デ エタブリッスマン ミシュラン 補強ビードを備えた重車両用タイヤ
WO2016017508A1 (fr) * 2014-07-30 2016-02-04 株式会社ブリヂストン Pneu

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004181911A (ja) * 2002-12-06 2004-07-02 Yokohama Rubber Co Ltd:The 空気入りタイヤの製造方法
JP2013500197A (ja) * 2009-07-30 2013-01-07 コンパニー ゼネラール デ エタブリッスマン ミシュラン 補強ビードを備えた重車両用タイヤ
JP2013500198A (ja) * 2009-07-30 2013-01-07 コンパニー ゼネラール デ エタブリッスマン ミシュラン 補強ビードを備えた重車両用タイヤ
WO2016017508A1 (fr) * 2014-07-30 2016-02-04 株式会社ブリヂストン Pneu

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