WO2020090850A1 - Pneu à affaissement limité - Google Patents

Pneu à affaissement limité Download PDF

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Publication number
WO2020090850A1
WO2020090850A1 PCT/JP2019/042468 JP2019042468W WO2020090850A1 WO 2020090850 A1 WO2020090850 A1 WO 2020090850A1 JP 2019042468 W JP2019042468 W JP 2019042468W WO 2020090850 A1 WO2020090850 A1 WO 2020090850A1
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WO
WIPO (PCT)
Prior art keywords
tire
bead
radial direction
resin material
bead filler
Prior art date
Application number
PCT/JP2019/042468
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English (en)
Japanese (ja)
Inventor
正之 有馬
Original Assignee
株式会社ブリヂストン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2020090850A1 publication Critical patent/WO2020090850A1/fr

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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
    • 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
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor

Definitions

  • the present invention relates to a run flat tire.
  • Patent Document 1 a technique of forming a bead filler with a material other than a rubber material is known (Patent Document 1).
  • the bead filler described in Patent Document 1 is formed of a thermoplastic resin.
  • the bead filler described in Patent Document 1 is smaller than the conventional bead filler made of a rubber material.
  • the periphery of the bead filler is deformed especially by input from the rim wheel, but as described above, there is a difference in rigidity between the resin-formed bead filler and the rubber material around the bead filler. Since it is large, the amount of deformation around the bead filler becomes large, which may reduce the durability performance of the runflat tire.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide a run-flat tire that can improve durability even when the bead filler is formed of a resin material. .
  • a tire (run-flat tire 10) includes a tread portion (tread portion 20) that is in contact with a road surface, and a tire side portion (tire side portion) that is continuous with the tread portion and is located inside the tread portion in the tire radial direction. 30), a bead portion (bead portion 60) continuous to the tire side portion and located on the tire radial direction inner side of the tire side portion, and a reinforcing rubber (reinforcing rubber 70) provided on the tire side portion.
  • the tire includes a carcass (carcass 40) that forms the framework of a run flat tire. The reinforcing rubber is provided inside the carcass in the tire width direction.
  • the bead portion is formed of a resin-coated cord (cord 61a), and has an annular bead core (bead core 61) extending in the tire circumferential direction, and a bead made of a resin material, which is arranged adjacent to the outside of the bead core in the tire radial direction. And a filler (bead filler 62).
  • the carcass has a main body portion (main body portion 41) and a folded portion (folded portion 42) that is continuous with the main body portion and is folded back to the outside in the tire width direction via the bead core.
  • the tire is provided along a tire width direction inner side surface (tire width direction inner side surface 42a) of the folded portion and includes a reinforcing sheet (reinforcing sheet 80) made of the same or different resin material as the resin material.
  • the end portion (end portion 62a) of the bead filler on the outer side in the tire radial direction is arranged between the both end portions (both end portions 80a, 80b) of the reinforcing sheet in the tire radial direction.
  • the durability performance can be improved even when the bead filler is made of a resin material.
  • FIG. 1 is a cross-sectional view of a tire along a tire width direction and a tire radial direction.
  • FIG. 2 is an enlarged cross-sectional view of the bead portion.
  • FIG. 1 is a cross-sectional view of the run-flat tire 10 along the tire width direction and the tire radial direction. In FIG. 1, cross-sectional hatching is omitted (the same applies below).
  • the run flat tire 10 includes a tread portion 20, a tire side portion 30, a carcass 40, a belt layer 50, a bead portion 60, and a reinforcing rubber 70.
  • the run-flat tire 10 according to the present embodiment is capable of traveling at a constant speed (80 km at 80 km / h) (run-flat traveling) even when the internal pressure (air pressure) is significantly reduced due to puncture (for example, 0 kPa). It is possible.
  • the tread portion 20 is a portion in contact with the road surface (not shown).
  • the tread portion 20 is formed with a pattern (not shown) according to the environment in which the run flat tire 10 is used and the type of vehicle on which the run flat tire 10 is mounted.
  • the tire side portion 30 is connected to the tread portion 20 and is located inside the tread portion 20 in the tire radial direction.
  • 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 40 forms the skeleton of the run flat tire 10.
  • the carcass 40 is a radial structure having carcass cords (not shown) radially arranged along the tire radial direction.
  • the carcass 40 is not limited to the radial structure, and may have a bias structure in which the carcass cords are arranged so as to intersect in the tire radial direction.
  • the belt layer 50 is provided on the tire radial inside of the tread portion 20.
  • the belt layer 50 is a resin-coated single-layer spiral belt as shown in FIG.
  • the belt layer 50 is not limited to the single-layer spiral belt.
  • the belt layer 50 may be a rubber-coated two-layer cross belt.
  • the bead portion 60 is continuous with 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, and the carcass 40 is folded back from the tire width direction inner side to the tire width direction outer side via the bead portion 60.
  • the reinforcing rubber 70 is provided on the tire side portion 30.
  • the reinforcing rubber 70 has a cross-sectional shape, specifically, a crescent shape in the cross section of the run flat tire 10 along the tire width direction and the tire radial direction. That is, the central portion of the reinforcing rubber 70 in the tire radial direction has a wide width in the tire width direction, and the width in the tire width direction decreases toward the tire radial direction outer side and the tire radial direction inner side.
  • the reinforcing rubber 70 is provided inside the carcass 40 in the tire width direction.
  • the reinforcing rubber 70 is made of rubber having high rigidity and can support the load from the vehicle side even when the internal pressure of the run flat tire 10 is significantly reduced.
  • the reinforcing rubber 70 may be composed of a single or a plurality of types of rubber members, and may include other materials (short fibers, resins, etc.) as long as the rubber members are the main components.
  • FIG. 2 is an enlarged cross-sectional view of the bead portion 60. Specifically, FIG. 2 is a cross-sectional view of the bead portion 60 along the tire width direction and the tire radial direction.
  • the carcass 40 is folded back to the outside in the tire width direction via the bead portion 60.
  • the carcass 40 includes a body portion 41 and a folded portion 42.
  • the body portion 41 is a portion that 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.
  • 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 61.
  • the bead portion 60 is formed of a resin-coated cord 61a, and has an annular bead core 61 extending in the tire circumferential direction, and a bead filler 62 disposed adjacent to the bead core 61 on the tire radial outer side.
  • the bead core 61 is formed by stacking a plurality of (for example, three) resin-coated cords 61a in the tire circumferential direction (for example, three layers).
  • 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 as the resin coating the cord 61a.
  • a thermoplastic resin having elasticity, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used as the resin coating the cord 61a.
  • TPE thermoplastic elastomer
  • thermosetting resin thermosetting resin
  • thermoplastic elastomer a polyolefin thermoplastic elastomer (TPO), a polystyrene thermoplastic elastomer (TPS), a polyamide thermoplastic elastomer (TPA), a polyurethane thermoplastic elastomer (TPU), a polyester thermoplastic elastomer (TPC).
  • TPO polyolefin thermoplastic elastomer
  • TPS polystyrene thermoplastic elastomer
  • TPA polyamide thermoplastic elastomer
  • TPU polyurethane thermoplastic elastomer
  • TPC polyester thermoplastic elastomer
  • TPV Dynamically crosslinkable thermoplastic elastomer
  • thermoplastic resin examples include polyurethane resin, polyolefin resin, vinyl chloride resin, and polyamide resin.
  • the deflection temperature under load (0.45 MPa load) specified by ISO75-2 or ASTM D648 is 78 ° C or more
  • the tensile yield strength specified by JIS K7113 is 10 MPa.
  • JIS K7113 tensile elongation at break
  • a method Vicat softening temperature
  • the bead filler 62 is sandwiched between the body portion 41 of the carcass 40 and the folded portion 42.
  • the bead filler 62 has a triangular shape whose thickness gradually decreases toward the outside in the tire radial direction.
  • the bead filler 62 is also made of the above-mentioned resin material, like the bead core 61.
  • a reinforcing sheet 80 made of a resin material is arranged along the tire width direction inner side surface 42a of the folded portion 42 of the carcass 40. Further, the end portion 62a of the bead filler 62 on the outer side in the tire radial direction is arranged between the both end portions 80a and 80b of the reinforcing sheet 80 in the tire radial direction. Note that 80a is an end portion of the reinforcing sheet 80 on the outer side in the tire radial direction. 80b is an end portion on the inner side in the tire radial direction.
  • the resin material forming the reinforcing sheet 80 and the resin material forming the bead filler 62 may be the same or different.
  • the elastic modulus of the resin material forming the reinforcing sheet 80 is higher than the elastic modulus of the resin material forming the bead filler 62. May be low.
  • the reinforcing sheet 80 made of a resin material is arranged along the tire width direction inner side surface 42a of the folded portion 42.
  • the reinforcing sheet 80 is arranged adjacent to the bead filler 62 on the outer side in the tire width direction.
  • the end portion 62a of the bead filler 62 on the outer side in the tire radial direction is arranged between the both end portions 80a and 80b of the reinforcing sheet 80 in the tire radial direction.
  • the reinforcing sheet 80 alleviates a step in rigidity between the resin-formed bead filler 62 and the rubber material around the bead filler 62 (particularly around the end 62a).
  • the force transmitted from the rim wheel 100 to the bead filler 62 during run-flat traveling is also reduced by the reinforcing sheet 80.
  • the bead filler 62 is made of a resin material, the durability performance of the run flat tire 10 is improved.
  • the elastic modulus of the resin material forming the reinforcing sheet 80 may be lower than the elastic modulus of the resin material forming the bead filler 62. As a result, the elastic modulus gradually increases toward the inner side in the tire width direction, so that the above-mentioned rigidity step is further alleviated. Therefore, the durability performance of the run flat tire 10 is further improved.

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

Abstract

Selon la présente invention, une partie talon (60) comprend : une tringle de talon annulaire (61) qui est composée de câblés recouverts de résine (61a) et qui s'étend dans la direction circonférentielle du pneu ; et un bourrage sur tringle (62) qui est formé d'un matériau de résine et est agencé adjacent à la tringle de talon (61) sur le côté externe dans la direction radiale du pneu. Une carcasse (40) comprend : une partie de corps principal (41) ; et une partie de retournement (42) qui est continue avec la partie de corps principal (41) et est repliée vers l'extérieur dans la direction de la largeur du pneu, la tringle de talon (61) étant interposée entre celles-ci. Un pneu à affaissement limité (10) selon la présente invention est doté d'une feuille de renforcement (80) qui est agencée le long d'une surface interne (42a) de la partie de retournement (42), ladite surface interne étant sur le côté interne dans la direction de la largeur du pneu, et qui est formée d'un matériau de résine qui est identique au ou différent du matériau de résine qui constitue le bourrage sur tringle (62). Une extrémité (62a) du bourrage sur tringle (62), ladite extrémité étant sur le côté externe dans la direction radiale du pneu, est agencée entre les deux extrémités (80a, 80b) de la feuille de renforcement (80) dans la direction radiale du pneu.
PCT/JP2019/042468 2018-10-31 2019-10-30 Pneu à affaissement limité WO2020090850A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018204967 2018-10-31
JP2018-204967 2018-10-31

Publications (1)

Publication Number Publication Date
WO2020090850A1 true WO2020090850A1 (fr) 2020-05-07

Family

ID=70463810

Family Applications (1)

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PCT/JP2019/042468 WO2020090850A1 (fr) 2018-10-31 2019-10-30 Pneu à affaissement limité

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Country Link
WO (1) WO2020090850A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09300924A (ja) * 1996-05-13 1997-11-25 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2002205515A (ja) * 2001-01-11 2002-07-23 Toyo Tire & Rubber Co Ltd 空気入りタイヤ
WO2005047028A1 (fr) * 2003-11-17 2005-05-26 Akihiro Yamamoto Pneu et procede de fabrication de celui-ci
JP2012051479A (ja) * 2010-09-01 2012-03-15 Toyo Tire & Rubber Co Ltd 空気入りタイヤ
JP2018135019A (ja) * 2017-02-22 2018-08-30 株式会社ブリヂストン 空気入りタイヤおよびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09300924A (ja) * 1996-05-13 1997-11-25 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2002205515A (ja) * 2001-01-11 2002-07-23 Toyo Tire & Rubber Co Ltd 空気入りタイヤ
WO2005047028A1 (fr) * 2003-11-17 2005-05-26 Akihiro Yamamoto Pneu et procede de fabrication de celui-ci
JP2012051479A (ja) * 2010-09-01 2012-03-15 Toyo Tire & Rubber Co Ltd 空気入りタイヤ
JP2018135019A (ja) * 2017-02-22 2018-08-30 株式会社ブリヂストン 空気入りタイヤおよびその製造方法

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