tire

Abstract

To provide a tire capable of securing sufficient durability of a communication device.SOLUTION: A tire 1 comprises a pair of bead sections 2, a pair of sidewall sections 3, a tread section 4, and a carcass 5, the tire having: side rubbers 11a and 11b, which comprise two or more layers of different types of rubber and which are each disposed on the outer side of the carcass 5 in a tire with direction so as to straddle a position SWH of greatest tire width in a tire radial direction; and a communication device, which is disposed on a boundary of at least one of the side rubbers 11a and 11b.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tire. [Background technology]

[0002] Conventionally, there are known configurations in which communication devices, such as sensors for detecting internal conditions of a tire such as tire air pressure, and RFID tags having a memory unit capable of storing unique identification information of the tire, are attached to the inner surface of the tire or embedded inside the tire. For example, the sensor as a communication device can determine the condition of the tire while it is in motion, and various pieces of tire information obtained from the memory unit of the RFID tag as a communication device can be utilized for maintenance services, etc.

[0003] For example, Patent Document 1 discloses a tire in which an RFID tag is sandwiched between carcass plies and the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-55450 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the tire described in Patent Document 1, the RFID tag is in contact with the carcass ply, and therefore deformation of the carcass ply when the tire rolls may affect the RFID tag, possibly reducing the durability of the RFID tag.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to provide a tire that can ensure sufficient durability of a communication device. [Means for solving the problem]

[0007] The tire of the present invention is A tire comprising a pair of bead portions, a pair of sidewall portions, a tread portion extending between both sidewall portions, and a carcass including at least one carcass ply extending on a toroid between the pair of bead portions, Two or more layers of side rubber made of different rubber materials are arranged on the outer side of the carcass in the tire width direction so as to straddle the maximum tire width position in the tire radial direction, and a communication device disposed at the boundary of at least one of the two or more layers of side rubber. According to the tire of the present invention, sufficient durability of the communication device can be ensured.

[0008] In the tire of the present invention, It is preferable that, of the two or more layers of side rubber, the layer on the outer side in the tire width direction has a lower relative dielectric constant than the layer on the inner side in the tire width direction. This effectively ensures sufficient communication performance of the communication device.

[0009] In the tire of the present invention, It is preferable that, of the two or more layers of side rubber, the hardness of the layer on the outer side in the tire width direction is lower than that of the layer on the inner side in the tire width direction. This makes it easier to ensure sufficient durability of the communication device over the long term.

[0010] In the tire of the present invention, It is preferable that, of the two or more layers of side rubber, the layer on the outer side in the tire width direction has a lower carbon content than the layer on the inner side in the tire width direction. This effectively ensures sufficient communication performance of the communication device.

[0011] In the tire of the present invention, It is preferable that, of the two or more layers of side rubber, the hardness of the layer on the outer side in the tire width direction is higher than that of the layer on the inner side in the tire width direction. This effectively ensures sufficient durability of the communication device and prevents the communication device from being damaged or otherwise affected by influences from outside the tire.

[0012] In the tire of the present invention, It is preferable that, of the two or more layers of side rubber, the layer on the outer side in the tire width direction has a higher carbon content than the layer on the inner side in the tire width direction. This makes it possible to prevent the communication device from being damaged or otherwise affected by influences from outside the tire.

[0013] In the tire of the present invention, A rubber chafer is disposed on at least a portion of the contact portion between the bead portion and the rim, The communication device is preferably disposed radially outward of the rubber chafer. This makes it possible to more effectively ensure sufficient communication performance.

[0014] In the tire of the present invention, It is preferable that, of the two or more layers of side rubber, the layer on the outer side in the tire width direction has a higher content of antioxidant than the layer on the inner side in the tire width direction. This can reduce the risk of the antioxidant affecting the communication device, and can effectively prevent tire deterioration due to external influences.

[0015] In the tire of the present invention, The communication device is preferably an RF tag. This allows wireless communication with a predetermined device outside the tire. Effect of the Invention

[0016] According to the present invention, it is possible to provide a tire that can ensure sufficient durability of a communication device. [Brief description of the drawings]

[0017] [Figure 1] 1 is a widthwise cross-sectional view (half view) of a tire according to each embodiment of the present invention mounted on an applicable rim. [Diagram 2] FIG. 2 is a perspective view showing an RF tag as a communication device disposed in a tire of the present embodiment. [Diagram 3] 1A and 1B are schematic circumferential cross-sectional views of a tire to explain the behavior of the cords of the carcass ply when the tire is rolling, where (A) shows the tire in a standard state, and (B) shows the tire when rolling with a predetermined load applied to the tire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The tire according to the present invention may be used for any type of tire, but is preferably used for a truck or bus tire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a tire according to the present invention will be described with reference to the drawings. In each drawing, the same components are denoted by the same reference numerals.

[0019] [First embodiment] FIG. 1 is a widthwise cross-sectional view (half view) of a tire according to one embodiment of the present invention mounted on an applicable rim.

[0020] Here, "applicable rim" refers to the standard rim (Measuring Rim in the ETRTO STANDARDS MANUAL, Design Rim in the TRA YEAR BOOK) for the applicable size that is described or will be described in the future in the industrial standards valid in the region where the tire is produced and used, such as the JATMA YEAR BOOK of JATMA (Japan Automobile Tire Manufacturers Association) in Japan, the STANDARDS MANUAL of ETRTO (The European Tyre and Rim Technical Organisation) in Europe, and the YEAR BOOK of TRA (The Tire and Rim Association, Inc.) in the United States (in other words, the above "rim" includes not only current sizes but also sizes that may be included in the above industrial standards in the future. An example of "sizes that will be described in the future" is the size described as "FUTURE DEVELOPMENTS" in the 2013 edition of the ETRTO STANDARDS MANUAL.), however, in the case of a size not described in the above industrial standards, it refers to a rim with a width that corresponds to the bead width of the tire. In addition, "specified internal pressure" refers to the air pressure (maximum air pressure) that corresponds to the maximum load capacity of a single wheel for the applicable size and ply rating, as listed in the above-mentioned JATMA YEAR BOOK, etc., and in the case of sizes not listed in the above-mentioned industrial standards, it refers to the air pressure (maximum air pressure) that corresponds to the maximum load capacity specified for each vehicle on which the tire is mounted. The air referred to here can be replaced with an inert gas such as nitrogen gas or the like.

[0021] In this specification, the term "maximum tire width position" refers to a position in the tire radial direction where the distance in the tire width direction between the carcasses in a pair of sidewall portions is maximum. In this specification, unless otherwise specified, the dimensions of each element, such as the tire widthwise distance, are measured in a "reference state" described below. The "reference state" refers to a state in which the tire is mounted on a rim, inflated to the above-mentioned predetermined internal pressure, and no load is applied.

[0022] The tire 1 includes a pair of bead portions 2, a pair of sidewall portions 3, a tread portion 4 extending between the sidewall portions, and a carcass 5 consisting of at least one carcass ply (one in the example of FIG. 1) extending in a toroidal manner between the pair of bead portions 2. A pair of bead cores 6 are embedded in each of the bead portions 2. The carcass ply is formed by rubber-coating a cord made of steel or organic fiber. In the example of FIG. 1, the carcass 5 includes a main body portion 5a extending in a toroidal manner between the bead cores 6, and a pair of folded-up portions 5b extending from both ends of the main body portion 5a and folded back around the bead core 6 from the inner side in the tire width direction to the outer side in the tire width direction. A belt 7 consisting of multiple belt layers and a tread rubber 8 are sequentially arranged on the tread portion 4 outside the crown region of the carcass 5 in the tire radial direction, and the tire outer surface of the tread rubber 8 is formed with, for example, multiple circumferential grooves 4a extending in the tire circumferential direction.

[0023] The tire 1 shown in Fig. 1 is mounted on an applicable rim R. The tire 1 of this embodiment may be provided with a rubber chafer 9 in the bead portion 2, which is arranged so that at least a portion of the rubber chafer 9 comes into contact with the applicable rim R when the tire 1 is mounted on the applicable rim R. The tire 1 of this embodiment may also be provided with a wire chafer 10 in the bead portion 2, which covers the periphery of the bead core 6 from the outside of the carcass.

[0024] In the example of FIG. 1, the tread rubber 8 includes a base rubber 8a and a cap rubber 8b located radially outside the base rubber 8a, but is not limited to such a configuration, and the tread rubber 8 may be made of one layer of rubber or three or more layers of rubber.

[0025] As shown in Fig. 1, in a tire 1 of this embodiment, two or more layers of side rubber 11 (two layers in the example of Fig. 1) are arranged on the outer side in the tire width direction of a carcass 5 so as to straddle a tire maximum width position SWH in the tire radial direction. In the tire 1 of this embodiment, the side rubber 11 includes an outer side rubber 11a on the outer side in the tire width direction and an inner side rubber 11b on the inner side in the tire width direction. The number of layers of the side rubber 11 is not particularly limited as long as it is two or more layers, and may be three or more layers.

[0026] The arrangement of the side rubber 11 is not particularly limited as long as the side rubber 11 is arranged to straddle the tire maximum width position SWH in the tire radial direction. In the example of Fig. 1, the side rubber 11 extends from both ends of the tread portion 4 to the sidewall portion 3.

[0027] More specifically, in the example of Figure 1, the end portion of the outer side rubber 11a on the outer side in the tire radial direction partially overlaps with the base rubber 8a and the cap rubber 8b in the tire radial direction, and is positioned so as to cover the end portion of the cap rubber 8b on the inner side in the tire radial direction from the outer side in the tire width direction. An end portion of the inner side rubber 11b on the outer side in the tire radial direction is disposed more inward in the tire radial direction than the outer side rubber 11a. The present invention is not limited to the above configuration, and may be configured such that an end portion of the outer side rubber 11a on the outer side in the tire radial direction is positioned more inward in the tire radial direction than an end portion of the inner side rubber 11b on the outer side in the tire radial direction. In addition, in the tire 1 of this embodiment, at the tire maximum width position SWH, the inner side rubber 11b is in contact with the carcass main body portion 5a, but if the side rubber 11 has three or more layers, a layer of side rubber other than the outer side rubber 11a and the inner side rubber 11b may be in contact with the carcass main body portion 5a.

[0028] In the tire 1 of this embodiment, a communication device 12 is arranged at at least one boundary (in this embodiment, the boundary between the outer side rubber 11a and the inner side rubber 11b) of two or more layers of side rubber 11 (in this embodiment, the outer side rubber 11a and the inner side rubber 11b). In addition, when the side rubber 11 has three or more layers, the communication device 12 may be arranged at any boundary, but from the viewpoint of communication performance, it is preferable that one communication device 12 is arranged at least at the outermost boundary in the tire width direction.

[0029] The communication device 12 is not particularly limited in configuration as long as it is configured to be capable of wireless communication with a predetermined device outside the tire 1. The communication device 12 may be, for example, an RF tag. The RF tag is also called an RFID (Radio Frequency Identification) tag. The communication device 12 may be configured to include an IC chip 13 that constitutes a control unit and a storage unit, and one or more antennas 12a connected to the IC chip 13. For example, the communication device 12 may have an elongated shape as a whole, in which two antennas extending linearly, wavy, or spirally are provided so as to extend in opposite directions from the IC chip 13. The IC chip may also be operated by an induced electromotive force generated by electromagnetic waves received by one or more antennas. That is, the communication device 12 may be a passive communication device. Alternatively, the communication device 12 may further include a battery and may be capable of communicating by generating electromagnetic waves using its own power. That is, the communication device 12 may be an active communication device.

[0030] Fig. 2 is a perspective view showing an RF tag as the communication device 12 arranged in the tire 1 of this embodiment. As shown in Fig. 2, the RF tag as the communication device 12 arranged in the tire 1 of this embodiment includes a first antenna 12a1 and a second antenna 12a2 that constitute the antenna 12a, an IC chip 13 that constitutes the control unit 12b and the memory unit 12c and operates by a dielectric electromotive force generated by radio waves received by the first antenna 12a1 and the second antenna 12a2, a plate-shaped support member 12d to which the IC chip 13 is attached, and a conductive conductive member 12e that electrically connects the IC chip 13 to the first antenna 12a1 and the second antenna 12a2. The communication device 12 may be covered with a rubber coating.

[0031] Hereinafter, the effects of the configuration of the tire 1 of this embodiment will be described with reference to FIG.

[0032] Fig. 3 is a schematic circumferential cross-sectional view of a tire for explaining the behavior of the cords of the carcass ply when the tire rolls, Fig. 3(A) shows the tire in a standard state, and Fig. 3(B) shows the tire when rolling with a predetermined load applied to the tire. In the example shown in the figure, three cords are shown as a schematic, which is different from the number of cords in the actual carcass ply. In FIG. 3, for convenience of explanation, the tire circumferential direction is indicated by arrow CD.

[0033] As shown in Fig. 3(A), in a standard state, the cords of the carcass ply extend radially from the rim in a circumferential cross section of the tire. When the tire is rolled under a predetermined load from the standard state, the cords of the carcass ply are deformed to become convex on one side in the tire circumferential direction within the contact patch as shown in Fig. 3(B). When the communication device is arranged so that a part of it is in contact with the cords of the carcass ply as in the conventional technology, the durability of the communication device may be impaired due to the deformation of the cords of the carcass ply to one side in the circumferential direction. Therefore, in the tire 1 of this embodiment, by arranging the communication device 12 at the boundary between the two layers of outer side rubber 11a and inner side rubber 11b, the communication device 12 is sandwiched between two different layers of rubber, which makes it possible to mitigate the effects of deformation of the cords of the carcass ply and ensure sufficient durability of the communication device 12.

[0034] The bead core 6 and its vicinity tend to have more metal members, such as the bead core 6 and the wire chafer 10, than the sidewall portion 3, and these metal members may cause communication to be less stable than in the sidewall portion 3. The side rubber into which the communication device 12 is sandwiched is generally located radially outward of the region where the above-mentioned metal members are more numerous, and by arranging the communication device 12 at the boundary of the side rubber 11, sufficient communication of the communication device 12 can be ensured.

[0035] Furthermore, by making the side rubber 11 out of two or more layers of different rubber types (outer side rubber 11a and inner side rubber 11b in this embodiment), it is easier to adjust the tire to suit the performance and driving environment required while ensuring sufficient durability of the communication device 12, compared to using a side rubber made of a single type of rubber.

[0036] Hereinafter, preferred configurations of each component of the tire 1 of the first embodiment will be described.

[0037] In the tire 1 of the first embodiment, it is preferable that, among the two or more layers of side rubber 11, the outer side rubber 11a which is the layer on the outer side in the tire width direction has a lower relative dielectric constant than the inner side rubber 11b which is the layer on the inner side in the tire width direction. When the side rubber 11 has three or more layers, it is preferable from the viewpoint of communication properties that the outermost side rubber in the tire width direction has the lowest relative dielectric constant. Here, the relative dielectric constant of the rubber can be appropriately changed by adjusting the amount of carbon mixed in the rubber, but there is no particular limitation on the method for adjusting the relative dielectric constant.

[0038] By disposing the outer side rubber 11a, which has a relatively low relative dielectric constant, on the outer side in the tire width direction, sufficient communication performance of the communication device 12 with a predetermined device outside the tire 1 can be effectively ensured.

[0039] In the tire 1 of this embodiment, it is preferable that, among the two or more layers of side rubber 11 (in this embodiment, the outer side rubber 11a and the inner side rubber 11b), the hardness of the outer side rubber 11a, which is the layer on the outer side in the tire width direction, is lower than that of the inner side rubber 11b, which is the layer on the inner side in the tire width direction. According to the above-mentioned configuration, the inner side in the tire width direction of the side rubber 11 has a relatively high rigidity, and deformation such as bending of the entire tire is suppressed when the tire rolls under a certain load. This also reduces the effect of tire deformation on the communication device 12, making it easier to ensure sufficient durability of the communication device 12 for a long period of time. When the side rubber 11 has three or more layers, from the viewpoint of ensuring the durability of the communication device 12 over the long term, it is preferable that the hardness of the side rubber on the innermost side in the tire width direction is the highest. Here, the hardness of rubber means JIS-A hardness measured at room temperature of 23° C. using a type A durometer (A type) in accordance with JIS K6253.

[0040] In the tire 1 of this embodiment, it is preferable that, of the two or more layers of side rubber 11 (in this embodiment, the outer side rubber 11a and the inner side rubber 11b), the carbon content of the outer side rubber 11a, which is the layer on the outer side in the tire width direction, is lower than that of the inner side rubber 11b, which is the layer on the inner side in the tire width direction. Since carbon may be one of the factors that increase the relative dielectric constant of rubber, by making the carbon content of the outer side rubber 11a relatively small, the increase in the relative dielectric constant of the rubber can be suppressed, and sufficient communication performance of the communication device 12 can be effectively ensured. When the side rubber 11 has three or more layers, it is preferable from the viewpoint of communication performance that the carbon content of the outermost side rubber in the tire width direction be the smallest. Here, the carbon may be any known carbon, and is not particularly limited. For example, carbon black may be used, and any hard carbon or soft carbon produced by the oil furnace method may be used.

[0041] In the tire 1 of this embodiment, the communication device 12 is not particularly limited in its radial position as long as it is disposed at the boundary between the outer side rubber 11a and the inner side rubber 11b. As described above, the tire 1 may have a rubber chafer 9 disposed at at least a part of the contact portion between the bead portion 2 and the rim R, and in this case, it is preferable that the communication device 12 is disposed outside the rubber chafer 9 in the radial direction of the tire.

[0042] The effects of the above configuration will now be described. There is a tendency for the bead core 6 and its vicinity to have more metal members, such as the bead core 6 and the wire chafer 10, than the sidewall portion 3, and these metal members may cause communication to be less stable than in the sidewall portion 3. The end of the rubber chafer 9 on the outer side in the tire radial direction is generally located on the outer side in the tire radial direction than the region where the above-mentioned metal members are abundant, and by arranging the communication device 12 on the outer side in the tire radial direction than the rubber chafer 9, sufficient communication can be ensured more effectively.

[0043] The orientation of the communication device 12 is not particularly limited, but when the communication device 12 has an elongated shape as shown in Fig. 2, for example, the first antenna 12a1 and the second antenna 12a2 can be arranged so that their longitudinal directions are aligned with the tire circumferential direction. Here, "along the tire circumferential direction" includes cases where the antenna longitudinal direction is parallel to the tire circumferential direction and cases where it is slightly inclined with respect to the tire circumferential direction (for example, an inclination angle with respect to the tire circumferential direction is 5° or less).

[0044] In the tire 1 of this embodiment, it is preferable that, among the two or more layers of side rubber 11 (in this embodiment, the outer side rubber 11a and the inner side rubber 11b), the content of the antioxidant is higher in the outer side rubber 11a, which is the layer on the outer side in the tire width direction, than in the inner side rubber 11b, which is the layer on the inner side in the tire width direction. Antiaging agents are mixed into the rubber of tires to prevent deterioration of rubber due to external influences such as oxygen and ozone. If the communication device 12 is disposed between the carcass ply and the side rubber, or is disposed so as to be embedded in the side rubber with a high content of antiaging agents, the components of the antiaging agent may affect the communication device 12 from the contact area with the rubber in the long term. However, in order to prevent deterioration of the side rubber, it is difficult to reduce the amount of antiaging agent in the area of ​​the tire that is susceptible to external influences. Therefore, by making the content of the antiaging agent in the outer side rubber 11a relatively high, the communication device 12 comes into contact with both the rubber with a relatively high content of antiaging agent and the rubber with a relatively low content of antiaging agent, and the contact area between the communication device 12 and the rubber with a relatively high content of antiaging agent can be reduced, and the risk of the antiaging agent affecting the communication device 12 can be mitigated. Furthermore, since the antiaging agent can be disposed in the area of ​​the tire that is susceptible to external influences, tire deterioration due to external influences can be effectively prevented. When the side rubber 11 has three or more layers, it is preferable that the content of the antioxidant in the outermost side rubber in the tire width direction be the highest, from the viewpoint of effectively preventing deterioration of the rubber. Here, the antiaging agent may be a known one and is not particularly limited. For example, phenol-based antiaging agents, imidazole-based antiaging agents, amine-based antiaging agents, etc. may be used. These antiaging agents may be used alone or in combination of two or more.

[0045] [Second embodiment] Next, a tire according to another embodiment (second embodiment) of the present invention will be described with reference to Fig. 1. The tire 1 of the second embodiment has the same configuration as the tire of the first embodiment except that the rubber used in the side rubber 11 has a different configuration related to the suitable hardness and carbon content, and therefore the description of the same configuration as the first embodiment will be omitted.

[0046] In the tire 1 of the second embodiment, it is preferable that, among the two or more layers of side rubber 11 (in this embodiment, the outer side rubber 11a and the inner side rubber 11b), the hardness of the outer side rubber 11a, which is the layer on the outer side in the tire width direction, is higher than that of the inner side rubber 11b, which is the layer on the inner side in the tire width direction. According to the above configuration, a rubber with a relatively low hardness is arranged on the inner side in the tire width direction than the communication device 12, so that the influence of the deformation of the cord of the carcass ply when the tire rolls is further mitigated, and sufficient durability of the communication device 12 can be effectively ensured. In addition, by increasing the hardness of the outer side rubber 11a disposed relatively on the outer side in the tire width direction, it is possible to sufficiently ensure cut resistance and abrasion resistance against input from the outside of the tire while the tire is running, and therefore it is possible to prevent damage to the communication device 12 due to influences from the outside of the tire. In addition, when the side rubber 11 has three or more layers, from the viewpoint of mitigating the effects of deformation of the cords of the carcass ply and effectively preventing effects on the communication device 12 from outside the tire, it is preferable that the hardness of the outermost side rubber in the tire width direction be the highest and the hardness of the side rubber closest to the carcass ply in the tire width direction be the lowest.

[0047] In the tire 1 of the second embodiment, it is preferable that, in the two or more layers of side rubber 11 (in this embodiment, the outer side rubber 11a and the inner side rubber 11b), the carbon content of the outer side rubber 11a, which is the layer on the outer side in the tire width direction, is higher than that of the inner side rubber 11b, which is the layer on the inner side in the tire width direction. One of the effects of increasing the carbon content is that the hardness of the rubber forming the tire is increased. Therefore, by increasing the carbon content of the outer side rubber 11a arranged relatively on the outer side in the tire width direction, the hardness of the outer side rubber 11a is increased, and it is possible to sufficiently ensure cut resistance and abrasion resistance against input from outside the tire when the tire is running. Therefore, it is possible to prevent damage to the communication device 12 due to influences from outside the tire. In addition, when the side rubber 11 has three or more layers, it is preferable to make the carbon content of the outermost side rubber in the tire width direction the highest, from the viewpoint of mitigating the effects of deformation of the cords of the carcass ply and effectively preventing effects on the communication device 12 from outside the tire.

[0048] In the tire 1 of the second embodiment, the carbon content of the outer side rubber 11a, which is a layer on the outer side in the tire width direction, may not be greater than that of the inner side rubber 11b, which is a layer on the inner side in the tire width direction. In this case, it is preferable that the silica content of the outer side rubber 11a, which is a layer on the outer side in the tire width direction, of the two or more layers of side rubber 11 (in this embodiment, the outer side rubber 11a and the inner side rubber 11b), is greater than that of the inner side rubber 11b, which is a layer on the inner side in the tire width direction. According to the above configuration, it is possible to reduce the rolling resistance of the tire and ensure sufficient wet performance without impairing the communication performance of the tire. When the side rubber 11 has three or more layers, it is preferable for the outermost side rubber in the tire width direction to have the highest silica content, from the viewpoint of achieving both tire communication and tire body performance. [Industrial Applicability]

[0049] The tire according to the present invention may be used for any type of tire, but is preferably used for a truck or bus tire. [Explanation of symbols]

[0050] 1: tire, 2: bead portion, 3: sidewall portion, 4: tread portion, 4a: circumferential groove, 5: carcass, 5a: main body portion, 5b: folded portion, 6: bead core, 7: belt, 8: tread rubber, 8a: base rubber, 8b: cap rubber, 9: rubber chafer 9, 10: wire chafer, 11: side rubber, 11a: outer side rubber, 11b: inner side rubber, 12: communication device, 12a: antenna, 12a1: first antenna, 12a2: second antenna, 12b: control unit, 12c: memory unit, 12d: support member, 12e: conductive member, 13: IC chip

Claims

1. A tire comprising a pair of bead portions, a pair of sidewall portions, a tread portion extending between both sidewall portions, and a carcass including at least one carcass ply extending on a toroid between the pair of bead portions, Two or more layers of side rubber made of different rubber materials are arranged on the outer side of the carcass in the tire width direction so as to straddle a maximum tire width position in the tire radial direction, A communication device disposed at at least one boundary between the two or more layers of side rubber; having The tire has a rubber chafer disposed on at least a part of a contact portion between the bead portion and a rim, the communication device is disposed on an outer side in a tire radial direction than the rubber chafer, The communication device is disposed radially inward of the tire maximum width position. tire.

2. The tire according to claim 1 , wherein, of the two or more layers of side rubber, a layer on an outer side in the tire width direction has a lower relative dielectric constant than a layer on an inner side in the tire width direction.

3. The tire according to claim 1 or 2, wherein the two or more layers of side rubber have a hardness of an outer layer in the tire width direction lower than a hardness of an inner layer in the tire width direction.

4. The tire according to any one of claims 1 to 3, wherein, of the two or more layers of side rubber, a layer on an outer side in the tire width direction has a lower carbon content than a layer on an inner side in the tire width direction.

5. The tire according to claim 1 , wherein the two or more layers of side rubber have a hardness of an outer layer in the tire width direction higher than a hardness of an inner layer in the tire width direction.

6. The tire according to claim 1 or 5, wherein, of the two or more layers of side rubber, a layer on an outer side in the tire width direction has a higher carbon content than a layer on an inner side in the tire width direction.

7. The tire further includes a bead core and a bead filler located on an outer side of the bead core in a tire radial direction, The tire according to any one of claims 1 to 6, wherein the communication device is disposed at the same radial position as an outer end of the bead filler in the tire radial direction.

8. The tire according to any one of claims 1 to 7, wherein, of the two or more layers of side rubber, a layer on an outer side in the tire width direction has a higher content of antioxidant than a layer on an inner side in the tire width direction.

9. The tire according to any one of claims 1 to 8, wherein the communication device is an RF tag.

10. The tire according to any one of claims 1 to 9, wherein the communication device is not covered by a covering rubber.

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