JP2023096611A - pneumatic tire - Google Patents

Abstract

To provide a pneumatic tire capable of sufficiently suppressing peeling of an electronic component while avoiding separation of a rubber layer.SOLUTION: A sound absorbing material 90 is joined to a tire inner surface 501, and an RFID tag 60 which is an electronic component is arranged between the tire inner surface 501 and the sound absorbing material 90. The sound absorbing material 90 is joined to the tire inner surface 501 by an adhesive 70 which is a plurality of strips of joining material extending in a tire circumferential direction, and the RFID tag 60 is disposed in a state of straddling at least two adjacent strips of the adhesive 70.SELECTED DRAWING: Figure 1

Description

The present invention relates to pneumatic tires for vehicles.

Conventionally, a tire provided with an RFID tag as an electronic component is known. For such a tire, the RFID tag and a reader that reads the information stored in the RFID tag communicate with each other, so that tire manufacturing management, usage history management, and the like can be performed. By the way, when an electronic component such as an RFID tag is placed in a tire, if it is embedded between the rubber layers constituting the tire, there is a risk that the rubber layer will peel off starting from the electronic component, so-called separation. Therefore, as disclosed in Patent Literature 1, it is possible to avoid separation due to the electronic component by attaching the electronic component to the inner surface of the tire.

Japanese Patent Application Laid-Open No. 2019-99108

However, the electronic component attached to the inner surface of the tire may be peeled off from the inner surface of the tire due to the deformation of the inner surface of the tire. According to Patent Document 1, by attaching the electronic component to the inner surface of the tire together with a cushion material surrounding the electronic component, the influence of the deformation of the inner surface of the tire on the electronic component is alleviated. There is concern.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a pneumatic tire capable of sufficiently suppressing separation of electronic components while avoiding separation of a rubber layer.

In the pneumatic tire of the present invention, a sound absorbing material is joined to the inner surface of the tire, and an electronic component is arranged between the inner surface of the tire and the sound absorbing material.

ADVANTAGE OF THE INVENTION According to this invention, the pneumatic tire which can fully suppress peeling of an electronic component can be provided, avoiding the separation of a rubber layer.

BRIEF DESCRIPTION OF THE DRAWINGS It is a tire width direction sectional drawing of the pneumatic tire which concerns on embodiment of this invention. 1 is a developed view showing part of the inner surface of a pneumatic tire according to an embodiment of the present invention; FIG. 1 is a plan view showing an RFID tag included in a pneumatic tire according to an embodiment of the invention; FIG.

Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a diagram showing a cross section in the tire width direction of a tire 1, which is a pneumatic tire according to this embodiment. The tire 1 is, for example, a passenger car tire. The basic structure of the tire 1 is bilaterally symmetrical in a cross section in the tire width direction. In the figure, symbol S is the tire equatorial plane. The tire equatorial plane S1 is a plane orthogonal to the tire rotation axis (tire meridian) and located at the center in the tire width direction.

The cross-sectional view of FIG. 1 is a tire width direction cross-sectional view (tire meridional cross-sectional view) in an unloaded state in which the tire 1 is mounted on a specified rim and filled with a specified internal pressure. In addition, the standard rim refers to a standard rim defined by JATMA corresponding to the tire size. Further, the specified internal pressure is 180 kPa, for example, when the tire is for passenger cars.

Here, the tire width direction is a direction parallel to the tire rotation axis, and is the horizontal direction of the paper surface in the cross-sectional view of FIG. 1 . In FIG. 1, it is illustrated as the tire width direction X. The inner side in the tire width direction is the direction toward the tire equatorial plane S1, and is the center side of the paper surface in FIG. The outer side in the tire width direction is the direction away from the tire equatorial plane S1, which is the left side and the right side of the paper surface in FIG.

Moreover, the tire radial direction is a direction perpendicular to the tire rotation axis, which is the up-down direction on the paper surface of FIG. 1 . In FIG. 1, it is illustrated as the tire radial direction Y. Further, the tire radial direction outer side is the direction away from the tire rotation axis, and is the lower side of the paper surface in FIG. The inner side in the tire radial direction is the direction toward the tire rotation axis, and is the upper side of the paper surface in FIG. 1 .

As shown in FIG. 1, the tire 1 includes a pair of beads 10 provided on both sides in the tire width direction, a pair of sidewalls 20 extending radially outward from each of the pair of beads 10, and a pair of sidewalls 20. A tread 30 arranged between, a carcass ply 40 arranged between a pair of beads 10, an inner liner 50 arranged on the tire inner cavity side of the carcass ply 40, a sound absorbing material 90, and an electronic component and an RFID tag 60 .

The bead 10 includes a bead core 11 , a bead filler 12 extending outward in the tire radial direction of the bead core 11 , a chafer 13 and a rim strip rubber 14 .

The bead core 11 is an annular member formed by winding a rubber-coated metal bead wire multiple times, and serves to fix the inflated tire 1 to the rim.

The bead filler 12 is a rubber member that tapers as it extends outward in the tire radial direction. The bead filler 12 is a member provided to increase the rigidity of the peripheral portion of the bead 10 and ensure high maneuverability and stability. The bead filler 12 is made of, for example, rubber having a higher hardness than the surrounding rubber member.

The chafer 13 is provided inside the carcass ply 40 provided around the bead core 11 in the tire radial direction.

The rim strip rubber 14 is arranged on the outer side of the chafer 13 and the carcass ply 40 in the tire width direction. The rim strip rubber 14 is a member that contacts the rim on which the tire 1 is mounted.

The sidewall 20 includes a sidewall rubber 21 arranged outside the carcass ply 40 in the tire width direction. The sidewall rubber 21 constitutes the outer wall surface of the tire 1 . The sidewall rubber 21 is the portion that bends the most when the tire 1 acts as a cushion, and is generally made of flexible rubber having fatigue resistance.

The tread 30 includes an endless belt 31 , a cap ply 32 and a tread rubber 33 .

The belt 31 is arranged outside the carcass ply 40 in the tire radial direction. The cap ply 32 is arranged outside the belt 31 in the tire radial direction.

Belt 31 is a member that reinforces tread 30 . The belt 31 of this embodiment has a two-layer structure including an inner belt 311 and an outer belt 312 . Both the inner belt 311 and the outer belt 312 have a structure in which a plurality of cords such as steel cords are covered with rubber. In addition, the belt 31 is not limited to a two-layer structure, and may have a one-layer structure or a structure of three or more layers.

The cap ply 32 is a member that reinforces the tread 30 together with the belt 31 . The cap ply 32 has a structure in which a plurality of insulating organic fiber cords such as polyamide fibers are covered with rubber. By providing the cap ply 32, it is possible to improve durability and reduce road noise during running.

The tread rubber 33 is arranged outside the cap ply 32 in the tire radial direction. The tread rubber 33 is a member forming a tread 331 that comes into contact with the road surface during running. The tread surface 331 of the tread rubber 33 is provided with a tread pattern 34 composed of, for example, a plurality of grooves. The tread pattern 34 has a plurality of main grooves 341 aligned in the tire width direction. Each of the plurality of main grooves 341 extends along the tire circumferential direction.

The carcass ply 40 constitutes a ply that forms the skeleton of the tire 1 . The carcass ply 40 is embedded in the tire 1 so as to pass through the pair of sidewalls 20 and the tread 30 between the pair of beads 10 . The carcass ply 40 includes a plurality of carcass cords (not shown) that form the frame of the tire 1 . The plurality of carcass cords extend, for example, in the tire width direction and are arranged side by side in the tire circumferential direction. The carcass cord is composed of an insulating organic fiber cord such as polyester or polyamide. A carcass ply 40 is constructed by covering a plurality of carcass cords with rubber.

The carcass ply 40 includes a ply body portion 401 extending from one bead core 11 to the other bead core 11 and extending between the tread 30 and the bead 10, and a pair of bent portions 402 folded back from the ply body portion 401 at the bead core 11. and a pair of folded portions 403 extending outward in the tire radial direction from each of the bent portions 402 . The ply body portion 401 , the bent portion 402 and the folded portion 403 surround the bead filler 12 and the bead core 11 . The folded portion 403 located outside the bead filler 12 in the tire radial direction is overlapped with the ply body portion 401 .

Although the carcass ply 40 of this embodiment has a one-layer structure, the carcass ply 40 is not limited to a one-layer structure, and may have a two-layer structure or a three-layer structure or more.

The chafer 13 of the bead 10 described above is provided so as to surround the tire radially inner end of the carcass ply 40 including the bent portion 402 . In addition, the rim strip rubber 14 is arranged on the outer side in the tire width direction of the folded portion 403 of the chafer 13 and the carcass ply 40 . The radially outer end of the rim strip rubber 14 is covered with the sidewall rubber 21 described above.

The inner liner 50 covers the inner surface of the ply body portion 401 of the carcass ply 40 and the inner surface of the chafer 13 of the pair of beads 10 . The inner liner 50 is made of air permeable rubber and prevents the air inside the tire cavity from leaking to the outside. The inner surface of the inner liner 50 constitutes the tire inner surface 501 between the pair of beads 10 .

The sound absorbing material 90 is joined to the tire inner surface 501 . The sound absorbing material 90 of the embodiment is a sponge having a large number of pores made of a foam material, and foamed resin such as polyurethane foam is preferably used. The sound absorbing material 90 is attached to the tire inner surface 501 of the tread 30 with an adhesive 70 that is a bonding material. The sound absorbing material 90 of the embodiment is arranged in a symmetrical state with the tire equatorial plane S1 as the center plane of symmetry.

The sound absorbing material 90 is annularly provided on the tire inner surface 501 with at least one member. The sound absorbing material 90 may be divided in the tire circumferential direction, or may be formed into an annular shape by two or more members divided in the tire width direction. The member may be configured in an annular shape. The sound absorbing material 90 reduces noise by absorbing various sounds generated in the inner cavity of the tire 1 while the vehicle is running.

From the viewpoint of weight balance in the tire 1, the sound absorbing material 90 preferably has a density of about 50 kg/m ³ and a specific gravity of about 0.025. From the viewpoint of durability, the sound absorbing material 90 preferably has a tensile strength of about 80 kPa and a hardness of about 160 N at 40% hardness. The dimensions of the sound absorbing material 90 are selected according to the dimensions of the tire 1 and the like. The thickness, that is, the dimension in the tire radial direction, is preferably about 20 mm.

The adhesive 70 that bonds the sound absorbing material 90 to the tire inner surface 501 has a form of a plurality of strips that extend over the entire circumference of the tire in the circumferential direction. In an embodiment, adhesive 70 is four strands. The four strips of adhesive 70 are applied to the tire inner surface 501 so as to be evenly arranged, two on each side of the tire equatorial plane S1. Note that the number of threads of the adhesive is not limited to four, and may be an appropriate number depending on the width of the sound absorbing material 90, the required adhesive strength, and the like. In addition, the one strip of adhesive 70 preferably has a width (size in the tire width direction) of about 3 mm or more and 10 mm or less in a cured state to which the sound absorbing material 90 is attached, and its height (tire radial direction). Dimension) is preferably about 3 mm or more and 10 mm or less, but is not limited thereto.

The adhesive 70 is not particularly limited as long as it can adhere the sound absorbing material 90 to the tire inner surface 501, but adhesives for rubber or tires are preferably used. The adhesive 70 that bonds the sound absorbing material 90 to the tire inner surface 501 preferably has a shear strength of 0.1 MPa or more within 6 minutes of curing after application from the viewpoint of adhesive strength and durability. The shear strength in this case was measured by a test method based on "JIS K 6854-1:1999".

The adhesive 70 is applied to the tire inner surface 501 after removing the tire inner surface mold release agent remaining on the tire inner surface 501 after the tire 1 has been vulcanized and molded. The area between the two left and right chain double-dashed lines indicated by reference numeral 80 in FIG. 2 is the area from which the tire inner surface mold releasing agent has been removed. The release agent removal area 80 is provided over the entire circumference of the tire inner surface 501 between positions slightly outside the adhesive agent 70 on the left and right ends in the tire width direction. This mold release agent removal area 80 is about 100 mm or more and 120 mm or less in the tire width direction.

Note that the sound absorbing material 90 may be attached to the tire inner surface 501 with a double-sided adhesive tape instead of using the adhesive 70 .

The RFID tag 60 is arranged between the tire inner surface 501 and the sound absorbing material 90 . The RFID tag 60 is formed as a thin film having a short strip shape. As shown in FIG. 3, the RFID tag 60 of the embodiment contains an RFID chip 62 and a plurality of antennas 63 for communicating with external devices in a base material 61 made of a flexible film. It is a passive transponder. In the storage unit provided in the RFID chip, information such as a manufacturing number, a part number, etc., is stored as information related to the tire 1 . FIG. 3 shows an example of the structure of the RFID tag 60, and the RFID tag 60 is not limited to this structure. Also, the shape and dimensions of the RFID tag 60 are not limited, but in the case of a strip, for example, a length of about 20 mm or more and 60 mm or less, a width of about 5 mm or more and 20 mm or less, and a thickness of about 1 mm is used.

The film-like RFID tag 60 is placed with one surface facing the tire inner surface 501 . Therefore, the RFID tag 60 does not protrude from the tire inner surface 501 . Therefore, the sound absorbing material 90 covering the RFID tag 60 is prevented from being affected by the RFID tag 60 and deformed. As shown in FIG. 2 , the RFID tag 60 is attached to the tire inner surface 501 and the sound-absorbing adhesive 70 in a state in which the length direction is along the tire width direction and in a state in which it straddles two adhesives 70 on both sides of the tire equatorial plane S1. It is arranged between the material 90 . The position of the RFID tag 60 in the tire circumferential direction is not particularly limited.

The RFID tag 60 is arranged and temporarily fixed in the release agent removal area 80 before the sound absorbing material 90 is attached to the tire inner surface 501 . As means for temporary fixation, for example, a double-sided adhesive tape is used. After the RFID tag 60 is temporarily fixed to the release agent-removed region 80 , four strips of adhesive 70 are applied, and then the sound absorbing material 90 is annularly attached to the tire inner surface 501 via the adhesive 70 . Thereby, the RFID tag 60 is arranged between the tire inner surface 501 and the sound absorbing material 90 .

According to this embodiment described above, the following effects are obtained.

(1) In the tire 1 according to the embodiment, the sound absorbing material 90 is joined to the tire inner surface 501 , and the RFID tag 60 as an electronic component is arranged between the tire inner surface 501 and the sound absorbing material 90 .

The RFID tag 60 is not embedded in the rubber of the tire 1 but attached to the inner surface 501 of the tire. Therefore, separation of the rubber layer starting from the RFID tag 60 does not occur. RFID tag 60 is attached to tire inner surface 501 RFID tag 60 is covered and fixed with sound absorbing material 90 attached to tire inner surface 501 with adhesive 70 . Therefore, even if the RFID tag 60 is about to separate from the tire inner surface 501 due to deformation of the tire inner surface 501 or the like, the state of being fixed by the sound absorbing material 90 is maintained. Therefore, detachment of the RFID tag 60 from the tire inner surface 501 is sufficiently suppressed.

(2) In the tire 1 according to the embodiment, the sound absorbing material 90 is joined to the tire inner surface 501 by the adhesive 70, which is a plurality of joints extending in the tire circumferential direction, and straddles at least two adjacent adhesives 70. It is preferable that the RFID tag 60 is placed in this state.

As a result, the amount of the adhesive 70 is suppressed, so an increase in the tire weight is suppressed, and the strength for bonding the sound absorbing material 90 together with the RFID tag 60 to the tire inner surface 501 is secured, and the effect of suppressing the peeling of the RFID tag 60 is further improved. Obtainable.

(3) In the tire 1 according to the embodiment, the RFID tag 60 is preferably film-like.

By arranging the film-like RFID tag 60 with one surface facing the tire inner surface 501 , deformation of the sound absorbing material 90 due to the RFID tag 60 is suppressed. Therefore, the sound absorbing performance of the sound absorbing material 90 is maintained, and the adhesion strength of the sound absorbing material 90 to the tire inner surface 501 is also maintained.

Although specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of achieving the object of the present invention are included in the scope of the present invention. be

For example, the bonding material for bonding the sound absorbing material 90 to the tire inner surface 501 is not limited to the adhesive 70, and may be bonded to the tire inner surface 501 with the necessary bonding strength, thereby suppressing the peeling of the RFID tag 60. Just do it.

1 tire (pneumatic tire)
60 RFID tag (electronic parts)
70 adhesive (bonding material)
90 sound absorbing material 501 tire inner surface

Claims (3)

A pneumatic tire, wherein a sound absorbing material is joined to the inner surface of the tire, and an electronic component is arranged between the inner surface of the tire and the sound absorbing material. 2. The sound absorbing material according to claim 1, wherein the sound absorbing material is joined to the inner surface of the tire by a plurality of joining members extending in the tire circumferential direction, and the electronic component is arranged so as to straddle at least two adjacent joining members. pneumatic tires. The pneumatic tire according to claim 1 or 2, wherein the electronic component is film-like.

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