tire

Abstract

The present invention provides a tire in which electronic components are arranged in a manner that is less susceptible to influence from tire cords, thereby achieving improved layout accuracy. The tire (1) comprises: a pair of bead parts (11) having a bead core (21) and a bead outer rubber (22) extending toward the tire radial direction outer side of the bead core (21); and a carcass cord (23) extending from the bead core of one bead part toward the bead core of the other bead part and folded around each bead core, wherein the tire (1) further comprises: a first pad (35) arranged on the tire width direction outer side of the folded-back end (25A) of the folded-back carcass cord, a second pad (36) arranged on the tire width direction outer side of the first pad, and a strip rubber (32) arranged on at least a portion of the tire width direction outer side of the second pad, wherein an RFID tag (40) as an electronic component is provided between the second pad and the strip rubber.

Description

Technical Field

[0001] The invention relates to a tire implanted with electronic components. Background Art

[0002] In the past, a tire having an electronic component such as an RFID embedded in a rubber structure is well known. Such a tire can perform tire manufacturing management, tire usage history management, etc. by communicating with a reader as an external device through the RFID tag embedded in the tire. For example, Patent Document 1 shows a tire equipped with an electronic component as an RFID tag, and the electronic component is arranged at the interface between the reinforced outer rubber covering the folded end of the cord surrounding the bead outer rubber from the outside and the rubber component (wear portion) covering the reinforced outer rubber from the outside.

[0003] Patent Literature

[0004] Patent Document 1: Japanese Patent No. 6276859 Summary of the invention

[0005] In the technology disclosed in Patent Document 1, since the reinforcing outer rubber is arranged as a single-layer member between the electronic component and the curtain, the electronic component is easily affected by the curtain.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a tire in which electronic components are arranged so as to be less likely to be affected by carcasses, thereby achieving improved layout accuracy.

[0007] (1) The tire of the present invention comprises: a pair of bead portions, the bead portions having a pair of annular bead cores arranged separately in the tire width direction, and a bead outer protective rubber extending toward the tire radial direction outside of the bead core; and a carcass ply, the carcass ply extending from the bead core of the bead portion on one side toward the bead core of the other side of the bead portion and folded back around each of the bead cores, and is characterized in that it also comprises: a first liner arranged on the tire width direction outside of the folded-back end of the carcass ply, a second liner arranged on the tire width direction outside of the first liner, and a pad strip rubber arranged on at least a portion of the tire width direction outside of the second liner, wherein electronic components are arranged between the second liner and the pad strip rubber.

[0008] Effects of the Invention

[0009] According to the present invention, it is possible to provide a tire in which electronic components are arranged so as to be less likely to be affected by the carcass and in which layout accuracy can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a diagram showing a half cross section in the tire width direction of a tire according to one embodiment of the present invention.

[0011] Figure 2 It is a partially enlarged cross-sectional view of a tire according to one embodiment of the present invention.

[0012] Figure 3A This is a diagram showing an RFID tag protected by a protective member and provided in a tire according to an embodiment of the present invention.

[0013] Figure 3B Yes means Figure 3A Diagram of the b-b section.

[0014] Figure 3C Yes means Figure 3A Diagram of the c-c section.

[0015] Figure 4 This is a diagram showing the results of a simulation of the in-plane distribution of strain energy when a load is applied to a tire having a structure similar to that of the tire according to one embodiment of the present invention.

[0016] Figure 5 It is a partially enlarged cross-sectional view showing a tire according to another embodiment of the present invention.

[0017] Description of reference numerals:

[0018] 1…tire; 11…bead portion; 13…sidewall portion; 21…bead core; 22…bead outer protective rubber; 23…carcass cord; 25A…the folded-back end of the carcass cord; 30…sidewall rubber; 31…wire bead wrap; 32…cushion rubber; 35…first gasket; 35A…the radially outer end of the first gasket; 36…second gasket; 36A…the radially outer end of the second gasket; 40…electronic component (RFID tag); 46…rubber; 431, 432…coated rubber sheets. DETAILED DESCRIPTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0020] Figure 1 1 is a diagram showing a half cross section in the tire width direction of the tire 1 according to the present embodiment. Figure 2 yes Figure 1 An enlarged cross-sectional view of a portion of the tire 1 on the inner side in the tire radial direction.

[0021] In general, the basic structure of a tire is that the cross section in the tire width direction is bilaterally symmetrical. The cross section shown here is the right half. In the figure, symbol S1 is the tire equatorial plane. The tire equatorial plane S1 is a plane that is orthogonal to the tire rotation axis and is located at the center of the tire width direction.

[0022] Here, the tire width direction is the direction parallel to the tire rotation axis. Figure 1 The left-right direction of the paper in a cross-sectional view. Figure 1 In the figure, the tire width direction X is shown.

[0023] The inner side in the tire width direction refers to the direction approaching the tire equatorial plane S1. Figure 1 The outer side in the tire width direction refers to the direction away from the tire equatorial plane S1. Figure 1 The middle is the right side of the paper.

[0024] In addition, the tire radial direction is the direction perpendicular to the tire rotation axis. Figure 1 The up and down direction on paper. Figure 1 In the figure, the tire radial direction Y is shown.

[0025] The outer side in the tire radial direction refers to the direction away from the tire rotation axis. Figure 1 The inner side of the tire radial direction is the direction close to the tire rotation axis. Figure 1 The middle is the lower side of the paper.

[0026] Figure 2 , Figure 5 The same is true.

[0027] The tire 1 is a tire for trucks or buses, for example, and includes a pair of bead portions 11 provided on both sides in the tire width direction, a tread portion 12 forming a contact surface that contacts the road surface, and a pair of sidewall portions 13 extending between the pair of bead portions 11 and the tread portion 12 .

[0028] The bead portion 11 includes a toroidal bead core 21 formed by winding a rubber-coated metal bead wire multiple times, and a tapered bead outer rubber 22 extending outward in the tire radial direction from the bead core 21 .

[0029] The bead core 21 is a member that can play the role of fixing the tire filled with air to a wheel rim (not shown). The bead outer rubber 22 is a member provided to increase the rigidity of the peripheral portion of the bead portion 11 and to ensure high maneuverability and stability.

[0030] The tire 1 has a carcass ply 23 that constitutes a tire skeleton. The carcass ply 23 extends from one bead core 21 toward the other bead core 21. That is, the carcass ply 23 is implanted between the pair of bead cores 21 in the tire 1 in a form that passes through the pair of sidewalls 13 and the tread 12.

[0031] like Figure 1 As shown, the carcass ply 23 extends from the bead core 21 on one side toward the bead core 21 on the other side, and includes: a ply main body 24 extending between the tread portion 12 and the bead portion 11, and a ply folded portion 25 folded around the bead core 21. Here, the folded end 25A of the ply folded portion 25 is located at a position closer to the tire radial inner side than the tire radial outer side end 22A of the bead outer rubber 22.

[0032] The carcass cord 23 is composed of a plurality of cords extending in the tire width direction. In addition, the plurality of cords are arranged in the tire circumferential direction. The cords are composed of metal steel cords or insulating organic fiber cords such as polyester or polyamide, etc., and are coated with rubber.

[0033] In the tread portion 12, and on the tire radially outer side of the carcass cord 23, a plurality of steel belt layers 26 are provided. The steel belt layer 26 is composed of a plurality of steel cords covered with rubber. By providing the steel belt layer 26, the rigidity of the tire can be ensured, so that the ground contact state between the tread portion 12 and the road surface is good. In this embodiment, although four steel belt layers 26 are provided, the number of stacked steel belt layers 26 is not limited to this.

[0034] A tread rubber 28 is provided on the tire radially outer side of the steel belt layer 26. A tread pattern 28A is provided on the outer surface of the tread rubber 28. The outer surface of the tread rubber 28 serves as a ground contact surface that comes into contact with the road surface.

[0035] A shoulder pad 38 is provided near the outer side of the tread portion 12 in the tire width direction and in the area between the carcass cord 23, the steel belt layer 26 and the tread rubber 28. The shoulder pad 38 extends to the outer side of the sidewall portion 13 in the tire radial direction, and an interface is formed between a portion of the shoulder pad 38 and the sidewall rubber 30 described later. That is, a portion of the shoulder pad 38 exists in the outer side of the sidewall portion 13 in the tire radial direction and on the inner side of the sidewall rubber 30 in the tire width direction.

[0036] The shoulder pad 38 is made of a rubber member having a cushioning property, and performs a cushioning function between the carcass ply 23 and the steel belt layer 26. In addition, the shoulder pad 38 is made of a rubber having a low heat generation property, and therefore, by extending to the sidewall portion 13, heat generation can be effectively suppressed.

[0037] An inner liner 29 as a rubber layer constituting the inner wall surface of the tire 1 is provided in the bead portion 11, the sidewall portion 13, the tread portion 12, and on the tire inner cavity side of the carcass ply 23. The inner liner 29 is made of air-permeable rubber and can prevent the air in the tire inner cavity from leaking to the outside.

[0038] In the sidewall portion 13, a sidewall rubber 30 constituting the outer wall surface of the tire 1 is provided outside the carcass ply 23 in the tire width direction. The sidewall rubber 30 is the most curved part when the tire plays a cushioning role, and is usually made of a soft rubber with fatigue resistance.

[0039] A wire chafer 31 as a reinforcing cord is provided on the inner side in the tire radial direction of the carcass cord 23 provided around the bead core 21 of the bead portion 11 so as to cover at least a portion of the carcass cord 23 .

[0040] The wire bead chafer 31 also extends toward the tire width direction outer side of the cord folded portion 25 of the carcass cord 23, and the end 31A of the wire bead chafer 31 on the tire width direction outer side is located at a position closer to the tire radial direction inner side than the folded end 25A of the carcass cord 23. The end 29A on the tire radial direction inner side of the inner liner 29 is bent so as to cover the corner portion of the wire bead chafer 31 on the tire width direction inner side. The wire bead chafer 31 is a metal reinforcement layer composed of metal steel cords and is covered with rubber.

[0041] like Figure 2 As shown, a flap rubber 32 is provided on the radially inner side of the wire bead chafer 31. The flap rubber 32 is provided in a form of covering the bead core 21 from the radially inner side of the tire. The flap rubber 32 covers the radially inner end 29A of the inner liner 29. The flap rubber 32 is arranged along the outer surface of the tire, and the flap rubber 32 is connected to the sidewall rubber 30. The flap rubber 32 and the sidewall rubber 30 are rubber components constituting the outer surface of the tire.

[0042] Furthermore, a first liner 35 is provided on the tire radially outer side of the end 31A of the wire chafer 31 and on the tire width direction outer side of the folded portion 25 of the carcass cord 23 and the bead outer rubber 22. The first liner 35 is provided at least on the tire width direction outer side of the folded end 25A of the carcass cord 23. The tire radially outer side of the first liner 35 is formed in such a manner that the front end thereof becomes more tapered toward the tire radially outer side.

[0043] The first gasket 35 has a portion with a thickness of 2 mm or more. The thickness of the first gasket 35 is not uniform. The first gasket 35 has a thick portion and a thin portion in its cross-sectional shape.

[0044] In addition, the second pad 36 is provided in a manner covering the outer side of the first pad 35 in the tire width direction. More specifically, the second pad 36 is provided in a manner covering the outer side of a portion of the wire chafer 31, the first pad 35, and a portion of the bead outer rubber 22 in the tire width direction. The outer side in the tire radial direction of the second pad 36 is formed in a manner that its front end becomes more tapered as it approaches the outer side in the tire radial direction. In addition, the inner side in the tire radial direction of the second pad 36 is formed in a manner that its front end becomes more tapered as it approaches the inner side in the tire radial direction. The position of the outer side end 36A in the tire radial direction of the second pad 36 is located at a position closer to the outer side in the tire radial direction than the position of the outer side end 35A in the tire radial direction of the first pad 35.

[0045] The second gasket 36 has a portion with a thickness of 2 mm or more. The thickness of the second gasket 36 is not uniform. The second gasket 36 has a thick portion and a thin portion in its cross-sectional shape.

[0046] The sidewall rubber 30 is arranged outside in the tire width direction in a tire radially outer region of the second pad 36 , and the rim strip rubber 32 is arranged outside in the tire width direction in a tire radially inner region of the second pad 36 .

[0047] In other words, the sidewall rubber 30 covers a portion of the outer side of the rim strip rubber 32 in the tire width direction and a portion of the outer side of the second pad 36 in the tire width direction.

[0048] The first gasket 35 and the second gasket 36 constitute the gasket member 34 , and the gasket member 34 is made of rubber having a modulus equal to or higher than that of the bead outer rubber 22 .

[0049] More specifically, the second gasket 36 is made of rubber having a modulus equal to or higher than that of the bead outer rubber 22, and the first gasket 35 is made of rubber having a modulus higher than that of the second gasket 36. The first gasket 35 and the second gasket 36 have the function of relieving the sharp strain caused by the local rigidity change point at the folded end 25A of the carcass ply 23 and the end 31A of the wire bead wrapper 31.

[0050] A rubber sheet 37 as a reinforcing rubber sheet is disposed between the bead filler 22 and the cushion member 34 and near the folded end 25A of the carcass ply 23. The rubber sheet 37 is disposed so as to cover the folded end 25A of the carcass ply 23 from the inner side in the tire width direction.

[0051] The rubber sheet 37 is made of rubber having a higher modulus than the bead filler 22 . More preferably, the rubber sheet 37 is made of rubber having a modulus substantially equal to that of the first gasket 35 .

[0052] Generally, stress is easily concentrated on the folded-back end 25A of the carcass ply 23. However, by providing the rubber sheet 37 as the above-mentioned reinforcing rubber sheet, the concentration of stress can be effectively suppressed.

[0053] In addition, if Figure 2 As shown, the rubber sheet 37 is preferably configured to cover the folded end 25A of the carcass ply 23 from the inner side in the tire width direction, but may also be configured to cover the folded end 25A of the carcass ply 23 from the outer side in the tire width direction. Even in this case, the concentration of stress can be alleviated.

[0054] The rubber sheet 37 is a rubber sheet with a thickness of 2 mm or less. The thickness of the rubber sheet 37 is constant. The cross-sectional shape of the rubber sheet 37 before being attached is a rectangular shape.

[0055] Here, the relationship between the flap rubber 32 and its surrounding components will be described again. The flap rubber 32 is arranged at least on the tire width direction outer side of the ply folded back portion 25 of the carcass ply 23 folded back around the bead core 21. In the present embodiment, the flap rubber 32 covers a portion of the tire width direction outer side of the cushion member 34 arranged on the tire width direction outer side of the folded back portion 25 of the carcass ply 23. In addition, the flap rubber 32 covers the tire radial inner end 29A of the inner liner 29, and the tire radial inner end 29A of the inner liner 29 covers a portion of the tire width direction inner corner of the wire chafer 31. In addition, the sidewall rubber 30 covers a portion of the tire width direction outer side of the flap rubber 32 and a portion of the tire width direction outer side of the cushion member 34. By providing such a cushion member 34, it is possible to effectively suppress the concentration of stress around the joint between the flap rubber 32 and the sidewall rubber 30.

[0056] Here, the modulus of each rubber element is described. If the modulus of the second liner 36 is used as a reference, the modulus of the sidewall rubber 30 is preferably 0.4 to 0.7 times the modulus of the second liner 36. In addition, the modulus of the first liner 35 is preferably 1.0 to 1.2 times the modulus of the second liner 36. Moreover, if the modulus of the second liner 36 is used as a reference, the modulus of the rim rubber 32 is preferably 0.8 to 1.2 times the modulus of the second liner 36. By setting such a modulus, the flexibility of the tire and the rigidity near the bead portion 11 can be balanced.

[0057] The modulus refers to the 100% elongation modulus (M100) in an atmosphere at 23° C. measured in accordance with “3.7 Stress at a given elongation, S” of JIS K6251:2010.

[0058] like Figure 2As shown, the tire 1 of this embodiment is implanted with an RFID tag 40 as an electronic component.

[0059] Figure 3A FIG. 4 shows an example of the RFID tag 40 according to the present embodiment. The RFID tag 40 is covered with a protective member 43. Figure 3A In the embodiment, the RFID tag 40 is covered by the covering rubber sheet 431 constituting the protection member 43 and is hidden. Figure 3B yes Figure 3A bb cross-section diagram, Figure 3C yes Figure 3A In this embodiment, as shown in FIG. Figure 3A to Figure 3C As shown, the RFID tag 40 is covered by covering rubber sheets 431 and 432 constituting the protection member 43 .

[0060] The RFID tag 40 is a passive transponder, which includes an RFID chip and multiple antennas 42 for communicating with external devices. The RFID tag 40 communicates wirelessly with a reader (not shown) as an external device. The storage unit in the RFID chip 41 stores identification information such as a manufacturing number and a part number.

[0061] As the antenna 42, various types of antennas such as coil-shaped spring antennas, plate-shaped antennas, and rod-shaped antennas can be used. Alternatively, an antenna formed by printing a predetermined pattern on a flexible substrate may be used.

[0062] In consideration of communication performance and flexibility, the antenna 42 is most preferably a coil-shaped spring antenna. The antenna 42 is set to an optimal antenna length according to the frequency band used and the like.

[0063] The protection member 43 is composed of two covering rubber sheets 431 and 432 for sandwiching and protecting the RFID tag 40 .

[0064] like Figure 3A to Figure 3C As shown in the figure, the RFID tag 40 involved in this embodiment has a structure in which two thin pin-shaped antennas 42 are arranged in a state of extending approximately concentrically on both sides of the RFID chip 41. As a result, the RFID tag 40 has a long length direction in the extending direction of the two antennas 42. The protective component 43 has a thin strip shape that roughly matches the shape of the RFID tag 40.

[0065] like Figure 1 as well as Figure 2As shown, the RFID tag 40 is implanted between the second liner 36 and the flap rubber 32. In the present embodiment, the RFID tag 40 is implanted between the second liner 36 and the flap rubber 32 at a position close to the tire radial outer end 32A of the flap rubber 32 and at a position covered by the tire radial inner end 30B of the sidewall rubber 30.

[0066] The RFID tag 40 is preferably arranged such that the length direction of the RFID tag 40 is the direction of a tangent line tangent to the circumferential direction of the tire 1, that is, Figure 1 2, and is implanted between the second pad 36 and the rim rubber 32. By implanting in this way, even when the tire 1 is mounted on a vehicle wheel and a load is applied to the tire 1 and deforms, the stress caused by the load is difficult to be applied to the RFID tag 40.

[0067] The RFID tag 40 includes an RFID chip 41 and an antenna 42 extending linearly from the RFID chip 41 to both sides of the RFID chip 41 , and the central axis of the antenna 42 coincides with the RFID chip 41 .

[0068] As the rubber used for the protective member 43 covering the RFID tag 40, a rubber having a modulus at least equal to or lower than that of the second gasket 36 can be used. For example, as the rubber used for the protective member 43, if the modulus of the second gasket 36 is used as a reference, it is preferable to use a rubber having a modulus 0.7 to 1.1 times that of the second gasket 36.

[0069] By being covered with the covering rubber sheets (431, 432) constituting the protective member 43, the RFID tag 40 is less likely to be directly subjected to stress generated when the tire 1 is deformed, thereby suppressing deformation or damage, and maintaining communication performance.

[0070] Figure 4 : is an enlarged cross-sectional view showing the results of a simulation of the in-plane distribution of strain energy in a case where a tire having a rubber structure similar to that of the tire 1 according to the present embodiment is assembled on a rim and a 100% load is applied. Figure 4 In Figure 1 as well as Figure 2 In the tire 1 according to the present embodiment shown, the same components are denoted by the same reference numerals.

[0071] In addition, Figure 4In the tire shown, the bead outer rubber 22 includes: a first bead outer rubber 221 covering the outer circumference of the bead core 21, and a second bead outer rubber 222 arranged on the radially outer side of the first bead outer rubber 221. The second bead outer rubber 222 is composed of a rubber having a higher modulus than the inner liner 29 and the sidewall rubber 30. Moreover, the first bead outer rubber 221 is composed of a rubber having a higher modulus than the second bead outer rubber 222.

[0072] exist Figure 4 In the , the region is divided into 5 levels according to the size of the strain energy. Here, the region with the highest strain energy is level 5, the region with relatively high strain energy is level 4, the region with slightly lower strain energy is level 3, the region with further lower strain energy is level 2, and the region with the lowest strain energy is level 1. Figure 4 In the figure, the regions are separated by thick dotted lines as boundaries.

[0073] At the interface between the second liner 36 and the rim rubber 32, the area on the outer side of the tire radial direction is approximately level 1, and the strain energy is small, which is a preferred area for arranging the RFID tag 40. The following results can be obtained through simulation: For example, when compared with Figure 4 Compared with the case where the RFID tag is implanted in the level 3 area of ​​the tire shown, the shear strain value is reduced by about 15%. In this way, since the RFID tag 40 is implanted in a position where strain is difficult to concentrate, the durability of the RFID tag 40 can be improved. In addition, since the level 1 area is outside the tire width direction and close to the sidewall portion 13, the communication performance can be fully utilized.

[0074] Here, the RFID tag 40 is installed before the vulcanization process in the manufacturing process of the tire. In this embodiment, the RFID tag 40 is installed on the second liner 36 or the rim rubber 32 before vulcanization. Figure 2 The part corresponding to the position shown in the figure. At this time, the second gasket 36 and the cushioning strip rubber 32 are in the state of raw rubber before vulcanization, so the RFID tag 40 can also be attached to the second gasket 36 or the cushioning strip rubber 32 by utilizing their adhesiveness. Alternatively, in the case of low adhesiveness, adhesive or the like can be used for attachment. After the RFID tag 40 is attached, the second gasket 36 and the cushioning strip rubber 32 are used to sandwich the RFID tag 40. Thereafter, the tire 1 is manufactured by assembling through a so-called turn-up molding process to obtain a green tire, which is then vulcanized in a vulcanization process. In the turn-up molding process, the RFID tag 40 and each component including at least the first gasket 35, the second gasket 36, the cushioning strip rubber 32, and the sidewall rubber 30 are folded back in a manner that the tire radial inner end surrounds the bead core 21 and the bead outer rubber 22.

[0075] The tire 1 according to the present embodiment is provided with a first pad 35 and a second pad 36 as a double-layer rubber member between the RFID tag 40 and the ply folded portion 25 of the carcass ply 23. Thus, for example, in the above-mentioned turn-up process, even if the first pad 35 is deformed by the ply folded portion 25, the stress generated by the deformation can be buffered by the second pad 36, and thus is difficult to be transmitted to the RFID tag 40. As a result, the RFID tag 40 is difficult to move and is maintained at a set position, and as a result, the layout accuracy of the RFID tag 40 is improved. In addition, by maintaining the position of the RFID tag 40 in this way, it is difficult to generate a gap between the second pad 36 and the flap rubber 32, or the generated gap is small. Thus, during vulcanization, it is possible to suppress the situation in which the rubber flows into the gap and the shape of the second pad 36 or the flap rubber 32 is deformed.

[0076] As described above, the manufacturing method of the tire 1 according to the present embodiment includes: a step of sandwiching the RFID tag 40 by the second liner 36 and the rim rubber 32, and a step of folding the RFID tag 40 and each component including at least the first liner 35, the second liner 36, the rim rubber 32, and the sidewall rubber 30 so as to surround the bead core 21 and the bead outer rubber 22. Thus, the RFID tag 40 can be arranged so as to be less susceptible to the influence of the carcass ply 23.

[0077] In the present embodiment, the position of the outer end 36A in the tire radial direction of the second pad 36 is located further outward in the tire radial direction than the position of the outer end 35A in the tire radial direction of the first pad 35. Accordingly, during the molding process of the tire 1, the first pad 35 is pressed into the second pad 36 to suppress deformation, and as a result, the RFID tag 40 is more difficult to move, thereby being able to more effectively improve the layout accuracy.

[0078] In addition, in the present embodiment, the sidewall rubber 30 covers a portion of the outer side of the flap rubber 32 in the tire width direction and a portion of the outer side of the second liner 36 in the tire width direction. Accordingly, since the boundary between the second liner 36 and the flap rubber 32 is covered by the sidewall rubber 30, the position of the RFID tag 40 implanted in the interface between the flap rubber 32 and the second liner 36 can be firmly maintained.

[0079] The RFID tag 40 according to the present embodiment is preferably arranged in a predetermined region as described below in the interface between the second gasket 36 and the rubber band 32 .

[0080] like Figure 2As shown, the distance D between the RFID tag 40 and the folded end 25A of the ply folding portion 25 of the carcass ply 23 is set to be greater than 5 mm. That is, the RFID tag 40 is arranged at a position more than 5 mm away from the folded end 25A. For example, specifically, the distance D is set to about 15 mm. Accordingly, during the molding process of the above-mentioned tire 1, since the RFID tag 40 is less likely to be affected by the carcass ply 23, it is possible to more effectively improve the layout accuracy. In addition, when the carcass ply 23 is made of metal, although the communication performance may be reduced when the RFID tag 40 is close to the carcass ply 23, the communication performance can be maintained by ensuring that the distance D is greater than 5 mm. In addition, the distance D is ensured to be greater than 5 mm in the tire 1 after molding. Therefore, in the stage before molding, the position of the RFID tag 40 is adjusted to ensure that the distance D after molding reaches more than 5 mm.

[0081] like Figure 2 As shown, the RFID tag 40 is arranged in the area from the tire radial outer end 32A of the flap rubber 32 to 20 mm inward in the tire radial direction. Accordingly, since the RFID tag 40 is implanted in a position where strain is difficult to concentrate, it is possible to achieve improved durability. In addition, as a specific example, the RFID tag 40 is arranged at a distance of about 10 mm from the tire radial outer end 32A of the flap rubber 32 toward the tire radial inner side.

[0082] In addition, if Figure 2 As shown, the RFID tag 40 may be disposed entirely in the region from the tire radially outer end 32A of the flap rubber 32 to 20 mm inwardly in the tire radial direction, or at least a portion thereof may be disposed in the region. In addition, as in the present embodiment, when the RFID tag 40 is covered by the covering rubber sheets 431 and 432 constituting the protective member 43, the covering rubber sheets 431 and 432 may be disposed entirely in the region from the tire radially outer end 32A of the flap rubber 32 to 20 mm inwardly in the tire radial direction.

[0083] According to the tire 1 according to the present embodiment described above, the following effects can be achieved.

[0084] (1) The tire 1 involved in the present embodiment comprises: a pair of bead portions 11, each bead portion having a pair of annular bead cores 21 separated and arranged in the tire width direction, and a bead outer rubber 22 extending to the tire radial direction outside of the bead core 21; and a carcass ply 23, the carcass ply extending from the bead core 21 of one bead portion 11 toward the bead core 21 of the other bead portion 11, and folded around each bead core 21, the tire 1 also comprises: a first liner 35 arranged on the tire width direction outside of the folded-back end 25A of the folded-back carcass ply 23, a second liner 36 arranged on the tire width direction outside of the first liner 35, and a cushioning strip rubber 32 arranged on at least a portion of the tire width direction outside of the second liner 36, and an RFID tag 40 as an electronic component is arranged between the second liner 36 and the cushioning strip rubber 32.

[0085] According to this, the RFID tag 40 can be arranged in a manner that is not easily affected by the carcass ply 23, thereby improving the layout accuracy of the RFID tag 40. In addition, since the RFID tag 40 is implanted in a position where strain is not easily concentrated, the durability of the RFID tag 40 can be improved. In addition, since the RFID tag 40 is implanted at the outer side in the tire width direction and at a position close to the tire side portion 13, the communication performance of the RFID tag 40 can be fully utilized.

[0086] (2) In the tire 1 according to the present embodiment, the tire radial direction outer end 36A of the second pad 36 is located further outward in the tire radial direction than the tire radial direction outer end 35A of the first pad 35 .

[0087] According to this, during the tire 1 molding process, the first gasket 35 is pressed into the second gasket 36 to suppress deformation, and as a result, the RFID tag 40 is more difficult to move, and the layout accuracy can be improved more effectively.

[0088] (3) In the tire 1 according to the present embodiment, the RFID tag 40 is disposed at a position that is 5 mm or more away from the folded-back end 25A of the carcass ply 23 .

[0089] Thus, during the tire 1 molding process, the RFID tag 40 is less susceptible to the influence of the carcass ply 23, and therefore, the layout accuracy can be improved more effectively. In addition, even when the carcass ply 23 is made of metal, the communication performance of the RFID tag 40 can still be maintained.

[0090] (4) In the tire 1 according to the present embodiment, at least a portion of the RFID tag 40 is disposed in a region extending from the tire radially outer end 32A of the rim strip rubber 32 to 20 mm inward in the tire radial direction.

[0091] According to this, since the RFID tag 40 is implanted in a position where strain is less likely to concentrate, it is possible to improve durability.

[0092] (5) The tire 1 according to the present embodiment includes the side wall rubber 30 located at a portion of the rim strip rubber 32 and at least a portion of the second liner 36 on the outside in the tire width direction.

[0093] According to this, the boundary between the second gasket 36 and the rim strip rubber 32 is covered with the sidewall rubber 30 , so that the position of the RFID tag 40 embedded in the boundary between the rim strip rubber 32 and the second gasket 36 can be firmly maintained.

[0094] (6) In the tire 1 according to the present embodiment, the RFID tag 40 is covered by the covering rubber sheets 431 and 432 constituting the protective member 43 .

[0095] As a result, the RFID tag 40 is less likely to be directly subjected to stress generated when the tire 1 is deformed, thereby suppressing deformation or damage, and maintaining communication performance.

[0096] (7) In the tire 1 according to the present embodiment, the rim strip rubber 32 preferably has a modulus that is 0.8 to 1.2 times that of the second liner 36 , based on the modulus of the second liner 36 .

[0097] This ensures a balance between the flexibility of the tire and the rigidity near the bead portion 11 .

[0098] (8) In the tire 1 according to the present embodiment, based on the modulus of the second gasket 36 , the covering rubber sheets 431 , 432 covering the RFID tag 40 are preferably made of rubber having a modulus that is 0.7 to 1.1 times that of the second gasket 36 .

[0099] As a result, the RFID tag 40 is less likely to be directly subjected to stress generated when the tire 1 is deformed, thereby suppressing deformation or damage, and maintaining communication performance.

[0100] (9) In the tire 1 according to the present embodiment, the chafer 31 is provided so as to cover at least a portion of the carcass ply 23 , and the flap rubber 32 is provided on the inner side of the chafer 31 in the tire radial direction.

[0101] According to this, the carcass ply 23 is reinforced by the chafer 31 , and the chafer 31 is protected by the flap rubber 32 .

[0102] Next, refer to Figure 5, another embodiment of the present invention is described. In addition, in the following description, the same symbols are given to the same structures as those in the above embodiment, and the description of these structures is omitted, and only the differences between the above embodiment are described.

[0103] Figure 5 The RFID tag 40 of another embodiment shown is arranged at a position closer to the inner side of the tire radial direction than the above embodiment. The RFID tag 40 is arranged at a position substantially the same as the radial inner end 30B of the sidewall rubber 30 in the tire radial direction, and is slightly closer to the inner side of the tire radial direction than the folded end 25A of the cord folded portion 25 of the carcass cord 23. Other than that, it has the same structure as the above embodiment.

[0104] In the embodiment as well, since the RFID tag 40 is provided between the second gasket 36 and the rubber band 32 , the above-mentioned effect (1) can be similarly produced.

[0105] In addition, the effects of (2), (5), and (6) described above can also be produced in the same manner.

[0106] In addition, the present invention is not limited to the above-mentioned embodiment, and modifications, improvements, etc. made within the scope of achieving the purpose of the present invention are included in the scope of the present invention.

[0107] For example, in the above embodiment, although the RFID tag 40 is covered by the covering rubber sheets 431 and 432 constituting the protective component 43, it can also be implanted so as to be directly sandwiched between the second pad 36 and the pad belt rubber 32 instead of being covered by the covering rubber sheets 431 and 432.

[0108] In addition, in this embodiment, although the RFID tag 40 is implanted in the tire as an electronic component, the electronic component involved in the present invention that is implanted in the tire is not limited to the RFID tag. For example, it can also be various electronic components such as sensors for wireless communication, piezoelectric elements, or strain sensors.

[0109] The tire of the present invention can be applied to various tires such as passenger cars, light trucks, trucks, and buses, and is particularly suitable for tires of trucks, buses, and the like.

[0110] (1) The tire of the present invention (e.g., tire 1) comprises: a pair of bead portions (e.g., bead portion 11), the bead portions having a pair of annular bead cores (e.g., bead core 21) separated and arranged in the tire width direction, and bead outer rubber (e.g., bead outer rubber 22) extending radially outward of the bead core; and a carcass ply (e.g., carcass ply 23), the carcass ply extending from the bead core of one bead portion toward the bead core of the other bead portion, and surrounding each of the bead cores. The tire is folded back and further comprises: a first pad (for example, the first pad 35) arranged on the outer side of the folded back end (for example, the folded back end 25A) of the folded back carcass ply in the tire width direction, a second pad (for example, the second pad 36) arranged on the outer side of the first pad in the tire width direction, and a pad strip rubber (for example, the pad strip rubber 32) arranged on at least a portion of the outer side of the second pad 36 in the tire width direction, and an electronic component (for example, an RFID tag 40) is arranged between the second pad and the pad strip rubber.

[0111] (2) In the tire of (1), the radially outer end of the second pad (e.g., the radially outer end 36A) is located closer to the outer side in the radial direction than the radially outer end of the first pad (e.g., the radially outer end 35A).

[0112] (3) In the tire of (1) or (2), the electronic component is arranged at a position 5 mm or more away from the folded end (for example, the folded end 25A) of the carcass ply.

[0113] (4) In any of the tires of (1) to (3), at least a portion of the electronic component is disposed in a region extending from the tire radially outer end (e.g., tire radially outer end 32A) of the rim strip rubber to 20 mm inward in the tire radial direction.

[0114] (5) In any one of the tires of (1) to (4), a sidewall rubber (for example, the sidewall rubber 30) is further provided, and the sidewall rubber is located outside in the tire width direction of at least a portion of the rim strip rubber and the second liner.

[0115] (6) In any one of the tires of (1) to (5), the electronic components are covered by a covering rubber sheet (for example, covering rubber sheets 431 and 432 ).

[0116] (7) In any one of the tires of (1) to (6), the rim strip rubber has a modulus that is 0.8 to 1.2 times that of the second cushion, based on the modulus of the second cushion.

[0117] (8) In the tire of (6), the covering rubber sheet has a modulus of 0.7 to 1.1 times that of the second gasket, based on the modulus of the second gasket.

[0118] (9) In any one of the tires of (1) to (8), a wire bead filler (e.g., wire bead filler 31) is provided to cover at least a portion of the carcass ply, and the flap rubber is provided on the inner side of the wire bead filler in the tire radial direction.

[0119] (10) In the tire of (9), the first pad is arranged on the radially outer side of the end of the wire bead wrapper (for example, the end 31A), and on the tire width direction outer side of the folded portion of the carcass cord (for example, the folded portion 25) and the bead outer guard.

[0120] (11) In the tire of (9) or (10), the second gasket is arranged to cover the outer side in the tire width direction of a portion of the wire chafer, the first gasket, and a portion of the bead filler.

[0121] (12) In any one of the tires of (1) to (11), the electronic component is implanted in the tire so that its longitudinal direction is in the direction of a tangent line to the circumferential direction of the tire.

[0122] (13) In any tire of (1) to (12), the electronic components include: an RFID chip (e.g., RFID chip 41), and an antenna (e.g., antenna 42) extending in a straight line from the RFID chip to both sides of the RFID chip, and the central axis of the antenna coincides with the RFID chip.

Claims

1. A tire, characterized in that: The tire has: A pair of bead portions, each bead portion having an annular bead core and a bead outer rubber extending toward the outer side of the bead core in the tire radial direction; a carcass ply extending from one of the bead cores toward the other bead core and folded back around each of the bead cores; a first liner disposed on the outer side of the folded-back end of the carcass ply in the tire width direction; a second pad disposed outside the first pad in the tire width direction; and a cushion strip rubber disposed at least partially on the outer side of the second cushion in the tire width direction, The second gasket is made of rubber having a modulus equal to or higher than that of the tire bead guard rubber, and the first gasket is made of rubber having a modulus higher than that of the second gasket. The electronic components are arranged between the second pad and the rubber pad. The tire also has sidewall rubber. The sidewall rubber is located at an outer side in the tire width direction of at least a portion of the flap rubber and the second liner. The electronic component is arranged at the same position as the radially inner end of the sidewall rubber in the tire radial direction and is arranged radially inward of a folded end of the carcass ply folded portion.

2. The tire according to claim 1, characterized in that The position of the outer end in the tire radial direction of the second pad is located further outward in the tire radial direction than the position of the outer end in the tire radial direction of the first pad.

3. The tire according to claim 1, characterized in that The electronic component is arranged at a position which is at least 5 mm away from the folded-back end of the carcass ply.

4. The tire according to claim 1, characterized in that At least a portion of the electronic component is disposed at a position ranging from an outer end of the rim strip rubber in the tire radial direction to 20 mm inward in the tire radial direction.

5. The tire according to claim 1, characterized in that The electronic components are covered by a covering rubber sheet.

6. The tire according to claim 1, characterized in that If the modulus of the second gasket is used as a reference, the cushion strip rubber has a modulus that is 0.8 to 1.2 times that of the second gasket.

7. The tire according to claim 5, characterized in that If the modulus of the second gasket is used as a reference, the covering rubber sheet has a modulus that is 0.7 to 1.1 times that of the second gasket.

8. The tire according to claim 1, characterized in that A wire chafer is provided so as to cover at least a portion of the carcass ply, and the flap rubber is provided on the inner side of the wire chafer in the tire radial direction.

9. The tire according to claim 8, characterized in that The first gasket is disposed on the outer side of the end of the chafer in the tire radial direction and on the outer side of the folded portion of the carcass cord and the bead filler in the tire width direction.

10. The tire according to claim 8, characterized in that The second gasket is provided so as to cover the outer sides in the tire width direction of a part of the chafer, the first gasket, and a part of the bead filler.

11. The tire according to claim 1, characterized in that The electronic component is implanted in the tire so that the longitudinal direction thereof is in the direction of a tangent line that is tangent to the circumferential direction of the tire.

12. The tire according to claim 1, characterized in that The electronic component comprises: an RFID chip, and an antenna extending straightly from the RFID chip toward two sides of the RFID chip, wherein a central axis of the antenna coincides with the RFID chip.

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