JP2023087599A - tire - Google Patents

Abstract

To provide a tire where a tire skeleton member is formed of a resin material which facilitates mounting of an RFID.SOLUTION: A tire 10 includes: a tire skeleton member 12 having a bead part 16 where bead cores 14 are buried in a bead filler part 17 of a resin material, and a side part 18 that is composed of a resin material and is connected to outside in a tire radial direction of the bead part 16; and an RFID tag 50A provided in the bead filler part 17.SELECTED DRAWING: Figure 1

Description

The present invention relates to tires.

Conventionally, an RFID tag is embedded inside a tire, and information is stored in the RFID tag by wireless communication, and the stored information is read. Various modes have also been proposed for the mounting position of the RFID. For example, in Patent Literature 1, an RFID is provided inside the tire belt portion in the tire radial direction and outside in the tire width direction.

It is a technique for rubber tires such as Patent Document 1, and it is necessary to consider the position where the RFID is provided for tires in which the tire frame member is formed of a resin material.

JP 2019-018717 A

An object of the present invention is to easily attach an RFID to a tire having a tire frame member made of a resin material.

A tire according to a first aspect includes a tire frame member having a bead portion in which a bead core is embedded in a bead filler portion made of a resin material, and side portions each made of the resin material and extending outward in the tire radial direction of the bead portion. and an RFID tag provided on the bead filler portion.

In the tire according to the first aspect, since the RFID tag is provided on the bead filler portion of the resin material, it is easier to attach the RFID during manufacturing than when the RFID is provided on the rubber portion. Therefore, the RFID can be easily attached to the tire in which the tire frame member is made of a resin material.

In the tire according to the second aspect, the RFID tag is arranged in the thick portion of the bead filler portion in the tire radial direction.

In the tire according to the second aspect, the RFID tag is arranged in the thick portion of the bead filler portion in the tire radial direction. The thick portion in the tire radial direction of the bead filler portion is relatively resistant to deformation during running, and can suppress damage to the RFID tag.

In the tire according to the third aspect, the RFID tag is arranged on the inner peripheral portion of the bead filler portion in the tire width direction.

In the tire according to the third aspect, the RFID tag is arranged on the inner peripheral portion of the bead filler portion in the tire width direction. The inner peripheral portion of the bead filler portion in the tire width direction is relatively less deformable during running than the outer peripheral portion, and can suppress damage to the RFID tag.

In a tire according to a fourth aspect, the RFID tag has a resin coating portion in which the body chip and the antenna are embedded.

In the tire according to the fourth aspect, the resin coating portion of the RFID tag and the resin material of the bead filler portion can be easily integrated by melting or the like.

ADVANTAGE OF THE INVENTION According to the tire which concerns on this invention, RFID can be easily attached in the tire whose tire frame member is formed with the resin material.

It is a half section view showing a tire concerning this embodiment. (A) is a plan view and (B) is a side view of the RFID tag provided on the tire of the present embodiment. It is a section perspective view showing a tire concerning this embodiment. It is a half section view showing a tire concerning a modification of this embodiment. It is a half cross-sectional view showing a tire according to another modification of the present embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described based on the drawings. In the drawings, the arrow R direction indicates the tire radial direction, and the arrow W direction indicates the tire width direction. A tire radial direction means a direction orthogonal to a tire rotation axis (not shown). The tire width direction means a direction parallel to the tire rotation axis. The tire width direction can also be called the tire axial direction.

The dimensional measurement method of each part is according to the method described in the 2021 edition of the YEAR BOOK issued by JATMA (Japan Automobile Tire Manufacturers Association). If TRA standards and ETRTO standards are applied at the place of use or manufacturing, follow the respective standards.

A tire 10 according to the present embodiment has a tire frame member 12 as shown in FIG. The tire frame member 12 has a bead portion 16 in which the bead core 14 is embedded in a bead filler portion 17 made of a resin material, and side portions 18 each made of a resin material and connected to the outer side of the bead portion 16 in the tire radial direction. there is The side portions 18 on both sides in the tire width direction are connected by a crown portion 22 .

Examples of the resin material forming 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 resins (including thermoplastic elastomers) refer to polymeric compounds that soften and flow as the temperature rises and become relatively hard and strong when cooled. In this specification, the thermoplastic elastomer is a polymer compound that softens and flows as the temperature rises, becomes relatively hard and strong when cooled, and has rubber-like elasticity. A thermoplastic resin that is not an elastomer is classified as a polymer compound that softens, flows, becomes relatively hard and strong when cooled, and does not have rubber-like elasticity.

Thermoplastic resins (including thermoplastic elastomers) include polyolefin thermoplastic elastomer (TPO), polystyrene thermoplastic elastomer (TPS), polyamide thermoplastic elastomer (TPA), polyurethane thermoplastic elastomer (TPU), polyester Thermoplastic elastomer (TPC), dynamic cross-linking thermoplastic elastomer (TPV), polyolefin thermoplastic resin, polystyrene thermoplastic resin, polyamide thermoplastic resin, polyester thermoplastic resin, etc. mentioned.

In addition, the above thermoplastic material has, for example, a deflection temperature under load (at a load of 0.45 MPa) specified in ISO75-2 or ASTM D648 of 78 ° C. or higher, and a tensile yield strength specified in JIS K7113 of 10 MPa. As described above, those having a tensile elongation at break defined by JIS K7113 of 50% or more and a Vicat softening temperature (method A) defined by JIS K7206 of 130° C. can be used.

A thermosetting resin is a polymer compound that forms a three-dimensional network structure and hardens as the temperature rises. Thermosetting resins include, for example, phenol resins, epoxy resins, melamine resins, and urea resins.

In addition to the above-mentioned thermoplastic resin (including thermoplastic elastomer) and thermosetting resin, the resin material includes (meth)acrylic resin, EVA resin, vinyl chloride resin, fluorine resin, silicone resin, etc. general-purpose resin may be used.

The tire frame member 12 formed using a thermoplastic resin can be molded by a manufacturing method such as vacuum molding, pressure molding, injection molding, melt casting, or the like. Compared to molding and vulcanizing rubber, the manufacturing process can be greatly simplified and the molding time can be shortened.

In addition, the tire frame member 12 may be made of a single thermoplastic resin. 22, bead portion 16, etc.) may be made of thermoplastic resins having different characteristics and bonded together. The tire frame member 12 is a tire half body (not shown) in which one bead portion 16, one side portion 18, and a half-width crown half portion (not shown) are integrally formed. It may be joined by CL.

As the bead cord used for the bead core 14, a monofilament (single wire) such as metal fiber or organic fiber, or a multifilament (twisted wire) obtained by twisting metal fiber or organic fiber may be used. Metal fibers such as steel fibers may be used, and organic fibers such as aromatic polyamide fibers and aliphatic polyamide fibers may be used. Metal fibers and organic fibers are not limited to the above fibers. In this embodiment, a steel monofilament is used as the bead cord.

When the bead core 14 is made of a thermoplastic material, the thermoplastic material is preferably an olefin-, ester-, amide-, or urethane-based TPE, or a partially rubber-based TPV. . These thermoplastic materials, for example, have a deflection temperature under load (at a load of 0.45 MPa) defined by ISO75-2 or ASTM D648 of 75° C. or more, and a tensile yield elongation of 10% or more defined by JIS K7113. Similarly, it is preferable that the tensile elongation at break defined by JIS K7113 is 50% or more and the Vicat softening temperature (method A) defined by JIS K7113 is 130° C. or more.

In this embodiment, in the bead core 14, bead cords are arranged in three rows in the tire width direction and three rows in the tire radial direction. The bead core 14 has a substantially square shape in a cross section in the tire width direction.

The bead portion 16 is formed by embedding the bead core 14 in the bead filler portion 17 . The bead filler portion 17 is formed integrally with the side portion 18 from the same resin material as the side portion 18 . The bead filler portion 17 (bead portion 16) includes an inclined portion 17A whose cross section is inclined so that the thickness gradually increases from the inner side in the tire radial direction of the side portion 18 toward the inner side in the tire radial direction, and the tire of the inclined portion 17A. It has a thick portion 17B in which substantially the same thick shape continues from the radially inner side. The inclined portion 17A is inclined outward in the tire width direction toward the outside in the tire radial direction. In the present embodiment, the bead filler portion 17 is formed outward in the tire radial direction from the inner end in the tire radial direction of the inclined portion 17A.

A carcass 24 is provided along the tire skeleton member 12 to reinforce the tire skeleton member 12 . The carcass 24 has a body portion 24A and a folded portion 24B. 24 A of main-body parts are provided along the tire outer side of the bead part 16 of the tire skeleton member 12, the side part 18, and the crown part 22. As shown in FIG. The end portion of the body portion 24A on the side of the tire equatorial plane CL is overlapped in the tire width direction with a width of, for example, 20 mm in the tire radial direction at the portion of the tire equatorial plane CL. The folded portion 24B is folded around the bead core 14 from the outside of the tire to the inside of the tire. The tip of the folded portion 24B of the carcass 24 is positioned, for example, closer to the side portion 18 (outer in the tire radial direction) than the thick portion 17B.

A belt layer 26 is provided outside the carcass 24 in the crown portion 22 of the tire frame member 12 in the tire radial direction. A material such as a metal having a higher rigidity than the resin material forming the tire skeleton member 12 is used for the cord 28 . In this embodiment, a steel cord made by twisting steel fibers is used as the cord 28 . In the belt layer 26, the resin materials 30 of the resin-coated cords 32 adjacent in the tire width direction are joined together.

The belt layer 26 is formed by spirally winding a resin-coated cord 32 formed by coating a cord 28 with a resin material 30 in the tire circumferential direction, and is adhered or welded to the carcass 24 . The belt layer 26 may be formed only of the cords 28, or may be in the form of a sheet in which the cords 28 are covered with the same type of thermoplastic resin as the tire skeleton member 12.

A layer 34 for belt end reinforcement is provided on the tire radial direction outer side of the tire width direction outer end portion of the belt layer 26 . As the fiber cords used for this layer 34, for example, organic fiber cords such as aliphatic polyamide, polyester, and aromatic polyamide can be used. Steel cords can be used as the fiber cords, and known layer materials used in general pneumatic tires can also be used. The fiber cords of layer 34 are coated with rubber or resin. The layer 34 may include a plurality of fiber cords, but may be composed of, for example, a sheet-like member that does not include fiber and is made of a single resin material or a single rubber. The bending rigidity of the layer 34 is preferably less than or equal to the bending rigidity of the belt layer 26 so that the layer 34 follows deformation of the tread 36, which will be described later.

A tread 36 that is a rubber layer is arranged outside the crown portion 22 of the tire skeleton member 12 in the tire radial direction. The tread 36 is arranged mainly along the crown portion 22 of the tire frame member 12 and constitutes the tire tread, which is the contact portion of the tire 10 . The tread 36 is laminated on the tire frame member 12 via the belt layer 26 .

The tread 36 is made of rubber that is superior in wear resistance to the thermoplastic resin forming the tire frame member 12 . As the rubber used for the tread 36, the same type of rubber as used in conventional rubber pneumatic tires can be used.

A side rubber layer 38 is provided outside the carcass 24 along the side portion 18 in the tire width direction. A rubber layer 40 is also provided around the bead portion 16 .

The position where the thickness of the bead filler portion 17 begins to decrease (the inner end portion in the tire radial direction of the inclined portion 17A) is located outside the tire radial direction outer end of the rim flange 44 of the rim 42 on which the bead portion 16 is mounted. is.

An RFID tag 50A is provided on the inner peripheral portion of the thick portion 17B of the bead filler portion 17 in the tire width direction. The RFID tag 50A includes a main body chip 52 and an antenna 54, as shown in FIGS. 2(A) and 2(B). The body chip 52 includes a processor including a CPU or MPU and a memory capable of storing various information. The antenna 54 extends from the body chip 52 to one side and the other side.

The body chip 52 and the antenna 54 are embedded in a resin coating portion 56 made of a resin material. The resin material forming the resin coating portion 56 is preferably the same kind of material as the resin material forming the bead filler portion 17 . The embedding in the resin coating portion 56 may be performed by sandwiching between films, or by absorbing the thickness of the main body chip 52 with the resin coating portion 56 having a large thickness. The RFID tag 50A has flexibility in the thickness direction, as shown in FIG. 2(B).

As shown in FIG. 3, the RFID tag 50A is arranged such that the longitudinal direction in which the antenna 54 extends is along the tire circumferential direction. In this way, by arranging the RFID tag 50 along the tire circumferential direction in the longitudinal direction, compared with a configuration in which the longitudinal direction is arranged along the tire radial direction, the tire frame member 12 during running is improved. It is possible to prevent the antenna 54 from being pulled along with the deformation and detached from the body chip 52 .

(Action)
Next, the action and effect of the pneumatic tire 10 of this embodiment will be described.

In the tire 10 according to the present embodiment, the RFID tag 50A is provided in the bead filler portion 17 made of a resin material, so the RFID can be easily attached during manufacturing compared to the case where the RFID is provided in the rubber portion. In particular, by embedding the body chip 52 and the antenna 54 of the RFID tag 50A in the resin coating portion 56 as in the present embodiment, bonding to the bead filler portion 17 made of resin material can be easily performed.

Further, in the present embodiment, the RFID tag 50A is arranged on the inner peripheral portion of the thick portion 17B of the bead filler portion 17 in the tire width direction. Since the thick portion 17B is relatively hard to deform during travel, damage to the RFID tag 50A can be suppressed.

In this embodiment, the RFID tag 50A is arranged on the inner peripheral portion of the thick portion 17B of the bead filler portion 17 in the tire width direction, but it does not necessarily have to be at this position. As shown in FIG. 4, an RFID tag 50B having the same configuration as the RFID tag 50A may be arranged on the outer peripheral portion of the thick portion 17B in the tire width direction.

Further, as shown in FIG. 5, an RFID tag 50C having the same configuration as the RFID tag 50A may be arranged on the inclined portion 17A of the bead filler portion 17. FIG. Since the inclined portion 17A is away from the bead core 14, when the bead core is made of metal, it is possible to secure a distance from the RFID tag 50C, thereby suppressing interference during communication.

DESCRIPTION OF SYMBOLS 10... Tire, 12... Tire frame member, 14... Bead core, 16... Bead part 17... Bead filler part, 17B... Thick part 50A, 50B, 50C... RFID tag 52... Main body chip, 54... Antenna, 56... Resin coating Layer (resin coated part)

Claims (4)

a tire frame member having a bead portion in which a bead core is embedded in a bead filler portion made of a resin material;
an RFID tag provided in the bead filler portion;
tires with The tire according to claim 1, wherein the RFID tag is arranged in a thick portion of the bead filler portion in the tire radial direction. The tire according to claim 1 or 2, wherein the RFID tag is arranged on the inner peripheral portion in the tire width direction of the bead filler portion. The tire according to any one of claims 1 to 3, wherein the RFID tag has a resin coating portion in which a body chip and an antenna are embedded.

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