tire

Abstract

The present invention provides a tire capable of protecting electronic components. The tire (1) comprises: a pair of bead parts (11), the 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); a bead core wrap (50), the bead core wrap (50) wrapping at least a part of the bead parts (11); a carcass cord (23), the carcass cord (23) having a cord main body (24) extending from one bead part (11) toward the other bead part (11), and a cord folding part (25) folded back at the bead part (11); and an RFID tag (40) as an electronic component, the RFID tag (40) being implanted in the tire in a manner of contacting the bead core wrap (50).

Description

Technical Field

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

[0002] In the past, tires with electronic components such as RFID tags embedded in them are well known. Such tires 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 with an RF tag embedded near a stiffener.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-37236 Summary of the invention

[0006] According to the technology disclosed in Patent Document 1, it is possible to manage the manufacturing, shipment, and usage history of tires. However, in the technology disclosed in Patent Document 1, the RF tag is arranged between the reinforcement part and the sidewall rubber, and there is no fiber layer such as the carcass cord between the RF tag and the outer wall of the tire. Therefore, when the tire is greatly deformed or the tire is impacted, the RF tag is not protected and may be damaged.

[0007] 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 capable of protecting electronic components.

[0008] The tire of the present invention comprises: a pair of bead portions, each of which has a bead core and a bead outer protective rubber extending toward the radially outer side of the tire with respect to the bead core; a bead core wrap (flipper), which wraps at least a portion of the bead portion; a carcass cord, which has a cord main body extending from the bead portion on one side toward the bead portion on the other side, and a cord folded back portion which is folded back at the bead portion and wraps the bead core wrap; and electronic components, which are implanted in the tire in a manner of contacting the bead core wrap.

[0009] Effects of the Invention

[0010] According to the present invention, it is possible to provide a tire that protects electronic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a diagram showing a half cross section in the tire width direction of the tire according to the first embodiment.

[0012] Figure 2 yes Figure 1 A partial enlarged cross-sectional view of a tire.

[0013] Figure 3 It is a diagram for explaining the flipper of the tire according to the above-mentioned embodiment.

[0014] Figure 4 This is a diagram showing the relationship between the distance between the bead core and the RFID tag, and the communication distance.

[0015] Figure 5 It is a partially enlarged cross-sectional view of a tire according to a first modified example of the above-mentioned embodiment.

[0016] Figure 6 It is a partially enlarged cross-sectional view of a tire according to a second modified example of the above-mentioned embodiment.

[0017] Figure 7 It is a partially enlarged cross-sectional view of a tire according to a third modified example of the above-mentioned embodiment.

[0018] Fig. 8A It is a diagram showing an RFID tag protected by a protective member in a tire according to a second embodiment.

[0019] Figure 8B Yes means Fig. 8A Diagram of the b-b section.

[0020] Figure 8C Yes means Fig. 8A Diagram of the c-c section.

[0021] Description of reference numerals:

[0022] 1…tire; 11…bead portion; 12…sidewall portion; 13…tread portion; 21…bead core; 22…bead outer protective rubber; 22A…tire radial outer end; 23…carcass cord; 24…cord body; 25 cord folded portion; 26…steel belt layer (belt layer); 27…crown cord; 28…tread rubber; 29…inner liner; 30…sidewall rubber; 31…bead chafer; 32…cushion rubber; 40…RFID tag (electronic component); 50…bead core wrap; 51…Part 1 (inner side); 52…Part 2; 53…Part 3 (outer side). DETAILED DESCRIPTION

[0023] <First embodiment>

[0024] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. Figure 11 is a diagram showing a half cross section of the tire 1 involved in the present embodiment in the tire width direction. The basic structure of the tire 1 is that the cross section in the tire width direction is bilaterally symmetrical, and the cross section shown here is a cross section of the right half. In the figure, the symbol S1 is the tire equatorial plane. The tire equatorial plane S1 is a plane that is orthogonal to the tire rotation axis (tire meridian) and is located at the center of the tire width direction.

[0025] 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. The inner side in the tire width direction is the direction close to 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 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. The outer side of the tire radial direction is 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] in addition, Figure 1 The cross-sectional view is a cross-sectional view in the tire width direction (a cross-sectional view of the tire meridian) in an unloaded state when the tire is mounted on a specified rim and filled with a regular internal pressure. In addition, the so-called regular rim is a standard rim determined by JATMA corresponding to the tire size. The so-called regular internal pressure is, for example, 180 kPa when the tire is used for a passenger car.

[0027] In addition, regarding the above content, Figure 2 , 5 The same is true for ~7.

[0028] The tire 1 is, for example, a tire for a passenger car, and comprises: a pair of bead portions 11 arranged on both sides in the tire width direction, a sidewall portion 12 extending from each bead portion 11 toward the radial outer side of the tire, and an annular tread portion 13 connected to the radial outer side of each sidewall portion 12 to form a tread (a contact surface with the road surface) 13C and extending along the circumferential direction of the tire.

[0029] Figure 2 yes Figure 1 The enlarged cross-sectional view of the bead portion 11 and the periphery of the inner region in the tire radial direction of the sidewall portion 12 in the tire 1 of the present embodiment is shown.

[0030] The bead portion 11 includes a bead core 21 and a bead outer rubber 22 extending toward the outer side of the bead core 21 in the tire radial direction.

[0031] The bead core 21 is a ring-shaped member formed by winding a rubber-coated metal bead wire multiple times, and plays a role of fixing the tire 1 filled with air to a wheel rim (not shown).

[0032] The bead outer rubber 22 is a rubber component with a tapered front end extending toward the outer side of the bead core 21 in the tire radial direction. The bead outer rubber 22 has a tire radial outer end 22A and a tire radial inner end 22B. The tire radial inner end 22B of the bead outer rubber 22 is in contact with the tire radial outer end 21A of the bead core 21. The bead outer rubber 22 is a component provided to increase the rigidity of the peripheral portion of the bead portion and to ensure higher maneuverability and stability. The bead outer rubber 22 is composed of, for example, a rubber having a higher hardness than the surrounding rubber components. The modulus of the rubber constituting the bead outer rubber is at least higher than the modulus of the rubber constituting the inner liner 29 described later and the rubber constituting the sidewall rubber 30.

[0033] The tire 1 has a carcass ply 23 built between the pair of bead portions 11 . The carcass ply 23 is a ply serving as a skeleton of the tire 1 , and is built between the pair of bead portions 11 in the tire 1 so as to pass through the pair of sidewall portions 12 and the tread portion 13 .

[0034] 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 13 and the bead portion 11, and a ply folded portion 25 folded around the bead core 21. In the present embodiment, the ply folded portion 25 overlaps with the ply main body 24 in the area of ​​the sidewall portion 12. The ply folded portion 25 has an end 25A. In the present embodiment, the end 25A of the ply folded portion 25 is located in the area of ​​the tread portion 13.

[0035] The carcass ply 23 is composed of a plurality of ply cords extending in the tire width direction. In addition, the plurality of ply cords are arranged in the tire circumferential direction. The ply cords are composed of insulating organic fiber cords such as polyester or polyamide, etc., and are covered with an upper layer of rubber. In the present embodiment, the ply cords constituting the carcass ply 23 are arranged radially (in the radial direction) from the center of the tire 1. That is, the tire 1 of the present embodiment is a so-called radial tire in which the ply cords are arranged in a radially extending manner.

[0036] The carcass ply 23 of the present embodiment is a single-layer carcass ply 23 including a single-layer carcass main body 24. However, the carcass ply 23 may be a multi-layer carcass ply 23 including a plurality of carcass main bodies 24.

[0037] The bead portion 11 further includes a chafer 31 and a rim rubber 32 disposed on the outer side of the chafer 31 in the tire width direction.

[0038] The chafer 31 is provided to cover the carcass cord 23 provided around the bead core 21. More specifically, the chafer 31 is provided to cover the inner side of the carcass cord 23 around the bead core 21 in the tire width direction, the inner side of the tire radial direction, and the outer side of the tire width direction. The chafer 31 has a first end 31A arranged on the inner side of the cord main body 24 in the tire width direction, and a second end 31B arranged on the outer side of the cord folded portion 25 of the carcass cord 23 in the tire width direction. The chafer 31 is made of, for example, rubber kneaded into fibers or rubber with a high modulus, and has a relatively high strength among the components constituting the tire 1. For example, its strength is higher than that of the inner liner 29 or the sidewall rubber 30 described later.

[0039] The flap rubber 32 is arranged on the tire width direction outer side of the chafer 31 and the ply folded portion 25 of the carcass ply 23. The flap rubber 32 is a rubber component that contacts the wheel rim (not shown) on the tire width direction outer side when the tire 1 is mounted on the wheel. The flap rubber 32 has a tire radial outer side end 32A and a tire radial inner side end 32B. The tire radial outer side of the flap rubber 32 is connected to the sidewall rubber 30.

[0040] The bead core wrap 50 is arranged on the bead portion 11. The bead core wrap 50 is a reinforcing fiber layer provided in a manner covering the bead core 21. The bead core wrap 50 is used to improve the rigidity of the entire bead portion. Accordingly, the pressure contact between the bead portion 11 and the rim is improved, thereby suppressing the bead portion 11 from being detached from the rim. The bead core wrap 50 is arranged to be sandwiched between the bead core 21 and the carcass cord 23 provided around the bead core 21. In more detail, the bead core wrap 50 includes a first portion 51 covering the inner side of the bead core 21 in the tire width direction, a second portion 52 covering the inner side of the bead core 21 in the tire radial direction, and a third portion 53 covering the outer side of the bead core 21 in the tire width direction. The bead core wrap 50 wraps at least a portion of the bead portion 11. In the present embodiment, the bead core 50 wraps at least a portion of the bead core 21 constituting the bead portion 11 through the first portion 51, the second portion 52, and the third portion 53. In the present embodiment, the bead core 50 wraps the bead core 21 constituting the bead portion 11 and the bead outer rubber 22.

[0041] The first portion 51 extends further outward in the tire radial direction than the bead core 21. In the present embodiment, the tire radial outer end 51A of the first portion 51 is arranged at a position further outward in the tire radial direction than the tire radial outer end 22A of the bead outer rubber 22. The first portion 51 is arranged to cover the tire width inner side of the bead core 21 and the tire width inner side of the bead outer rubber 22.

[0042] The first portion 51 includes a portion disposed between the inner side of the bead core 21 in the tire width direction and the cord body 24, and a portion disposed between the inner side of the bead outer rubber 22 in the tire width direction and the cord body 24. In the present embodiment, the first portion 51 further includes a portion disposed between the cord body 24 and the third portion 53 of the bead core wrap 50, and a portion disposed between the cord body 24 and the cord folded portion 25.

[0043] In addition, in the present embodiment, the tire radial outer end 51A of the first portion 51 is arranged at a tire radial position corresponding to the widest part of the tire inner cavity in the tire width direction in the tire sidewall portion 12. In this way, the tire radial outer end 51A of the first portion 51 is preferably arranged at a tire radial position corresponding to the widest part of the tire inner cavity in the tire width direction, or a position closer to the tire radial inside than this position. In addition, the tire radial outer end 51A of the first portion 51 can be arranged at a tire radial position equal to the tire radial outer end 22A of the tire bead outer rubber 22, or a position closer to the tire radial inside than this position. The bead core wrap 50 only needs to wrap at least a portion of the bead portion 11. The tire radial position of the tire radial outer end 51A of the first portion 51 is adjusted according to the rigidity required by the tire 1.

[0044] The second portion 52 is disposed so as to be sandwiched between the inner side of the bead core 21 in the tire radial direction and the carcass ply 23 .

[0045] The third portion 53 extends further outward in the tire radial direction than the bead core 21. In the present embodiment, the tire radial outer end 53A of the third portion 53 is arranged at a position further outward in the tire radial direction than the tire radial outer end 22A of the bead outer rubber 22. The third portion 53 is arranged to cover the tire width direction outer side of the bead core 21 and the tire width direction outer side of the bead outer rubber 22.

[0046] The third portion 53 includes a portion disposed between the outer side of the bead core 21 in the tire width direction and the cord folded portion 25, and a portion disposed between the outer side of the bead outer rubber 22 in the tire width direction and the cord folded portion 25. In the present embodiment, the third portion 53 further includes a portion disposed between the cord folded portion 25 and the first portion 51 of the bead core wrap 50.

[0047] In addition, in the present embodiment, the tire radial outer end 53A of the third portion 53 is arranged at a position in the tire sidewall portion 12 that is closer to the tire radial inner side than the tire radial position corresponding to the widest part of the tire inner cavity in the tire width direction. The tire radial outer end 53A of the third portion 53 is preferably arranged at a tire radial position corresponding to the widest part of the tire inner cavity in the tire width direction, or a position closer to the tire radial inner side than this position. In addition, the tire radial outer end 53A of the third portion 53 may also be arranged at a tire radial position that is equal to the tire radial outer end 22A of the tire bead outer rubber 22, or a position closer to the tire radial inner side than this position. The bead core wrap 50 only needs to wrap at least a portion of the bead portion 11. The tire radial position of the tire radial outer end 53A of the third portion 53 is adjusted according to the rigidity required by the tire 1.

[0048] In addition, in the present embodiment, the tire radially outer end 51A of the first portion 51 is located at a position closer to the tire radially outer side than the tire radially outer end 53A of the third portion 53. Therefore, the tire radially outer end 51A of the first portion 51 constitutes the tire radially outer end of the bead flipper 50. In addition, the tire radially outer end 53A of the third portion 53 may also be located at a position closer to the tire radially outer side than the tire radially outer end 51A of the first portion 51. In this case, the tire radially outer end 53A of the third portion 53 constitutes the tire radially outer end of the bead flipper 50.

[0049] The flipper 50 of the present embodiment is composed of an organic fiber cord layer including insulating organic fibers such as polyester and polyamide. Figure 3 This is a diagram for explaining an organic fiber cord layer constituting the flipper 50, and is a hypothetical diagram of the flipper 50 disposed in the tire 1 when viewed from the outside in the tire width direction toward the inside in the tire width direction. The flipper 50 is composed of a plurality of cords 50A formed by twisting a plurality of organic fibers, and a rubber 50B as an upper layer rubber that covers the plurality of cords 50A to form an integrated whole. Figure 3 In FIG. 1 , a plurality of cords 50A constituting the third portion 53 of the flipper 50 are indicated by solid lines.

[0050] like Figure 3As shown in FIG. 1 , a plurality of cords 50A constituting the core fabric extend obliquely relative to the radial direction R, and are arranged at intervals in the tire circumferential direction C in an inclined state. The angle θ formed by the radial direction R of the tire 1 and the extending direction of the cords 50A of the core fabric 50 is preferably 20° or more and 50° or less. In addition, in the present embodiment, the cords constituting the carcass ply 23 are arranged radially (in the radial direction) from the center of the tire 1. Accordingly, in the present embodiment, the angle θ formed by the extending direction of the cords of the carcass ply 23 and the extending direction of the cords 50A of the core fabric 50 is 20° or more and 50° or less.

[0051] In addition, the flipper 50 is wound around the bead core 21. Accordingly, as shown by the dotted line, the plurality of cords 50A constituting the first portion 51 of the flipper 50 are inclined in the opposite direction to the plurality of cords 50A constituting the third portion 53 with respect to the radial direction R. Even in the first portion 51, the angle θ formed by the radial direction R of the tire 1 and the extending direction of the cords 50A of the flipper 50 is preferably not less than 20° and not more than 50°.

[0052] The sidewall portion 12 includes a sidewall rubber 30 disposed on the outer side in the width direction of the carcass ply 23 .

[0053] The sidewall rubber 30 is a rubber component constituting the outer wall surface of the tire 1. The sidewall rubber 30 has a tire radially outer end 30A and a tire radially inner end 30B. The sidewall rubber 30 is the most curved portion when the tire 1 plays a cushioning role, and is usually made of a soft rubber with fatigue resistance.

[0054] The tread portion 13 includes a steel belt layer 26 as a belt layer arranged on the tire radial side outside the carcass ply 23 , a crown ply 27 arranged on the tire radial side outside the steel belt layer 26 , and a tread rubber 28 arranged on the tire radial side outside the crown ply 27 .

[0055] 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 1 can be ensured, so that the ground contact state between the tread portion 13 and the road surface is good. In the present embodiment, although a two-layer steel belt layer (an inner steel belt layer 261 and an outer steel belt layer 262) is provided, the number of stacked steel belt layers 26 is not limited thereto. In addition, the steel belt layer 26 using steel cords can be replaced by a belt layer using tire cords having aramid fibers or the like. In addition, the two-layer steel belt layer 26 of the present embodiment is formed such that the width of the inner steel belt layer 261 is wider than that of the outer steel belt layer 262. Therefore, the outer end of the inner steel belt layer 261 in the tire width direction constitutes the outer end 26A of the steel belt layer 26 in the tire width direction.

[0056] The crown cord 27 is a component disposed on the outer side of the steel belt layer 26 in the tire radial direction and has the function of a belt reinforcement layer. The crown cord 27 is composed of an insulating organic fiber layer such as polyamide fiber and is covered with an upper rubber layer. By providing the crown cord 27, durability can be improved and road noise during driving can be reduced. In this embodiment, the outer end 27A of the crown cord 27 in the tire width direction extends further outward in the tire width direction than the outer end 26A of the steel belt layer 26 in the tire width direction.

[0057] The tread rubber 28 is a member constituting the tread surface (contact surface that contacts the road surface) 13C. The tread rubber 28 has a tire width direction outer side end 28A. The tread surface 13C of the tread rubber 28 is provided with a tread pattern (not shown) consisting of a plurality of grooves.

[0058] 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 12, the tread portion 13, 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.

[0059] Here, if Figure 1 As shown, the sidewall rubber 30 of the sidewall portion 12 extends toward the tread portion 13. On the other hand, the tread rubber 28 of the tread portion 13 extends toward the sidewall portion 12. As a result, on the tire outer surface side of a portion of the carcass cord 23, the tread rubber 28 and the sidewall rubber 30 are laminated. More specifically, in the area where the sidewall rubber 30 and the tread rubber 28 coexist, that is, the transition area between the sidewall portion 12 and the tread portion 13, and on the tire outer surface side of the carcass cord 23, the sidewall rubber 30 and the tread rubber 28 are laminated in sequence.

[0060] like Figure 1 as well as Figure 2 As shown, a flap rubber 32 and a sidewall rubber 30 are arranged on the tire radially outer side of the flap rubber 32 in the tire bead portion 11 and the sidewall portion 12. Moreover, in the present embodiment, the tire radially outer end 32A of the flap rubber 32 is arranged at a position closer to the tire radially outer side than the tire radially outer end 22A of the bead outer rubber 22. Accordingly, it is possible to further effectively suppress the occurrence of local deformation near the rim assembly portion.

[0061] In addition, if Figure 1 as well as Figure 2 As shown, near the transition area between the bead portion 11 and the sidewall portion 12, and on the tire outer surface side of the carcass cord 23, the flap rubber 32 and the sidewall rubber 30 are stacked in sequence. In addition, near the transition area, there is a rim protection portion 33 having a top 33A protruding outward in the tire width direction, and the rim protection portion 33 extends continuously in a ring shape along the tire circumference. In this embodiment, the top 33A of the rim protection portion 33 is provided at the boundary portion between the flap rubber 32 and the sidewall rubber 30. That is, the position of the top 33A of the rim protection portion 33 coincides with the position of the radial inner end 30B of the sidewall rubber 30 in the tire radial direction. The rim protection portion 33 has the function of protecting the rim from external damage.

[0062] In addition, if Figure 1 as well as Figure 2 As shown, the first end 31A of the chafer 31 is arranged to be sandwiched between the carcass ply 23 and the inner liner 29. The second end 31B of the chafer 31 is arranged to be sandwiched between the carcass ply 23 and the folded portion 25 and the flap rubber 32.

[0063] In this embodiment, if Figure 1 As shown, the cord folded portion 25 extends to the tread portion 13. Moreover, the end 25A of the cord folded portion 25 is arranged at a position closer to the inside in the tire width direction than the outer end 26A of the steel belt layer 26 in the tire width direction. That is, in the outer area in the tire width direction of the tread portion 13 and on the tire outer surface side of the cord main body 24, the cord folded portion 25 and the steel belt layer 26 are stacked in sequence. In this way, the cord folded portion 25 and the steel belt layer 26 have overlapping portions in the component stacking direction from the tire inner cavity side to the tire outer surface side. Accordingly, the rigidity of the entire tire can be improved. However, the cord folded portion 25 and the steel belt layer 26 may not have overlapping portions in the component stacking direction from the tire inner cavity side to the tire outer surface side.

[0064] Here, if Figure 1As shown, the bead core wrap 50 and the steel belt layer 26 do not have an overlapping portion in the component stacking direction from the tire inner cavity side to the tire outer surface side. Specifically, the bead core wrap 50 does not extend to the tread portion 13. In the present embodiment, the tire radial outer end 51A of the bead core wrap 50 is located at the sidewall portion 12. That is, although the bead core wrap 50 extends to the sidewall portion 12, it does not extend to the tread portion 13. On the other hand, the tire width direction outer end 26A of the steel belt layer 26 of the tread portion 13 is located at the tread portion 13 and does not extend to the sidewall portion 12. In this way, the steel belt layer 26 and the bead core wrap 50 do not overlap, so even if a large load is applied to the tire due to a tire blowout, etc., and a large force is applied to the steel belt layer 26, it is possible to suppress the force from being directly transmitted to the bead core wrap 50.

[0065] The tire 1 of the present embodiment is implanted with an RFID tag 40 as an electronic component.

[0066] The RFID tag 40 is a passive transponder, which has an RFID chip and an antenna for communicating with an external device. The RFID tag 40 communicates wirelessly with a reader (not shown) as an external device. As the antenna, a coil-shaped spring antenna, a plate-shaped antenna, and various rod-shaped antennas can be used. For example, it can also be an antenna formed by printing a prescribed pattern on a flexible substrate. The antenna is set to an optimized antenna length according to the frequency band used, etc. The storage unit in the RFID chip stores identification information such as the manufacturing number and the part number.

[0067] like Figure 1 , Figure 2 As shown, the RFID tag 40 is configured to be in contact with the tire core wrap 50. According to this configuration, the movement of the RFID tag 40 is restricted by the tire core wrap 50 as a reinforcing fiber layer, and therefore, it is not easily affected by the deformation of the tire during driving. Accordingly, the durability of the RFID tag 40 can be improved without using additional components. In addition, according to this embodiment, the impact protection can also be improved. That is, even if the tire is impacted from the outside, since there is a carcass ply 23 as a fiber layer between the outer wall surface of the tire 1 and the RFID tag 40, the load applied to the RFID tag 40 can be reduced.

[0068] In the present embodiment, specifically, the RFID tag 40 is disposed between the tire bead outer rubber 22 and the tire bead core wrap 50. In this way, since the RFID tag 40 is disposed between the tire bead outer rubber 22 having a high modulus and the tire bead core wrap 50 serving as a reinforcing fiber layer, the deformation of the periphery of the RFID tag 40 is less, and stress is less likely to be concentrated. Accordingly, the RFID tag 40 is less likely to be damaged. Furthermore, since the cord folded portion 25 serving as a fiber layer and the third portion 53 of the tire bead core wrap 50 serving as a reinforcing fiber layer are present between the outer wall surface of the tire 1 and the RFID tag 40, the load applied to the RFID tag 40 can be further reduced.

[0069] In this embodiment, more specifically, the RFID tag 40 is arranged between the inner side of the tire width direction of the bead outer rubber 22 and the first part 51 of the bead core wrap 50. That is, between the outer wall surface of the tire 1 and the RFID tag 40, there are the cord folded portion 25 as a fiber layer, the third part 53 of the bead core wrap 50 as a reinforcing fiber layer, and the bead outer rubber 22. In this way, the RFID tag 40 is arranged on the inner side of the tire width direction of the bead outer rubber 22, and the distance from the outer wall surface of the tire 1 to the RFID tag 40 becomes longer, thereby further reducing the load applied to the RFID tag 40.

[0070] In addition, in the present embodiment, the RFID tag 40 is disposed at a position closer to the inner side of the tire radial direction than the second end 31B of the chafer 31. Thus, even when a force is applied from the outside, the load applied to the RFID tag 40 can be further reduced. In addition, in the present embodiment, the RFID tag 40 is disposed at a position closer to the outer side of the tire radial direction than the first end 31A of the chafer 31.

[0071] like Figure 1 as well as Figure 2 As shown, the RFID tag 40 is preferably configured at a position closer to the radially outer end 22A of the tire than the radially inner end 22B of the tire bead outer rubber 22. More preferably, at least a portion of the RFID tag 40 is configured at a position closer to the radially outer side of the tire than a position 10 mm from the radially outer end 22A of the tire bead core toward the radial inside of the tire. Even more preferably, all parts of the RFID tag 40 including the antenna are configured at a position closer to the radially outer side of the tire than a position 10 mm from the radially outer end 22A of the tire bead core toward the radial inside of the tire. For example, Figure 1 as well as Figure 2As shown, the RFID tag 40 of the present embodiment is preferably arranged in the area range L1 from the radially outer end 22A of the tire bead outer rubber 22 to the radially inner side of 10 mm. That is, at least a part of the RFID tag 40 is preferably arranged within a position of 10 mm from the radially outer end 22A of the tire bead outer rubber 22 toward the radially inner side of the tire. For example, at least a part of the RFID tag 40 is preferably arranged within a range of more than 2 mm and within 10 mm from the radially outer end 22A of the tire bead outer rubber 22 toward the radially inner side of the tire.

[0072] Figure 4 It means that the relationship between the separation distance between the tire radial outer end 21A of the bead core 21 and the RFID tag 40 and the communication distance has been studied. In addition, the communication distance on the vertical axis is obtained by indexing the communication distance with the longest communication distance being 100. This value can be 40 or more, preferably 60 or more, and more preferably 80 or more.

[0073] Since the bead core 21 is formed into a ring shape by stacking and winding metal bead wires, it is a metal component that is particularly likely to have an adverse effect on communication. Figure 4 It is known that the RFID tag 40 is preferably arranged at a position as far away from the tire bead core 21 as possible. As shown in the present embodiment, the RFID tag 40 is arranged in the area L1 10 mm away from the tire radial outer end 22A of the tire bead outer rubber 22, thereby suppressing the adverse effect on the communication. Thus, the ideal communication performance between the RFID tag 40 and the external reader can be ensured.

[0074] Here, the RFID tag 40 of the present embodiment is installed on the tire components before the vulcanization process in the manufacturing process of the tire 1. Specifically, the RFID tag 40 is installed on the tire outer rubber 22 or the tire core cloth 50. At this time, the tire outer rubber 22 and the upper rubber 50B of the tire core cloth 50 are in the state of raw rubber before vulcanization. Based on this, the RFID tag 40 is affixed to the tire outer rubber 22 or the tire core cloth 50 by utilizing the adhesiveness of the raw rubber. In addition, the RFID tag 40 can also be affixed using an adhesive or the like. Thereafter, the RFID tag 40 is sandwiched between the tire outer rubber 22 and the tire core cloth 50. After sandwiching, the tire components including the RFID tag 40 are assembled to obtain a green tire, and the green tire is vulcanized in the vulcanization process to manufacture the tire.

[0075] Therefore, in the present embodiment, when manufacturing the tire, the RFID tag 40 can be attached to the bead core 50 or the bead outer rubber 22 which is a reinforcing fiber layer and is rigid and covered with adhesive raw rubber. Therefore, the assembly operation of the RFID tag 40 becomes easy in the manufacturing process of the tire.

[0076] In addition, the RFID tag 40 implanted in the tire is as described later. Fig. 8A As shown in the RFID tag 40 in FIG. 1 , if it contains an antenna, it will have a length direction in most cases. Such an RFID tag 40 is preferably such that the length direction of the RFID tag 40 is the direction of the tangent line tangent to the circumferential direction of the tire, that is, in the Figure 1 , Figure 2 The RFID tag 40 is implanted in the tire 1 in a direction perpendicular to the paper surface in the cross-sectional view. By implanting in this way, stress is less likely to be applied to the RFID tag 40 even when the tire is deformed.

[0077] In addition, in the present embodiment, although an RFID tag 40 is implanted in the tire as an electronic component, the electronic components implanted in the tire are not limited to the RFID tag. For example, various electronic components such as sensors capable of wireless communication may also be used. In addition, when an electronic component is in electrical contact with a conductive component, the performance of the electronic component may change, making it difficult to maintain the characteristics of the electronic component. In addition, the electronic component may be damaged due to excessive stress. Accordingly, even when various electronic components are implanted in the tire, the effect of the present invention can still be obtained. For example, the electronic component may be a piezoelectric element or a strain sensor.

[0078] Figure 5 It is a partially enlarged cross-sectional view of a half cross section in the tire width direction of a tire 1 according to a first modified example of the present embodiment.

[0079] like Figure 5 As shown, the RFID tag 40 of the present modification is disposed between the outer side in the tire width direction of the bead filler 22 and the third portion 53 of the flipper 50 .

[0080] In this modification as well, the RFID tag 40 is arranged to be in contact with the flipper 50. Thus, the movement of the RFID tag 40 is restricted by the flipper 50 as the reinforcing fiber layer, and thus the RFID tag 40 is less likely to be affected by deformation of the tire during running.

[0081] In addition, even in this modified example, the RFID tag 40 is disposed between the high modulus bead outer rubber 22 and the bead core cloth 50 as a reinforcing fiber layer. Therefore, the deformation around the RFID tag 40 is small, and stress is not easily concentrated. Accordingly, the RFID tag 40 is not easily damaged.

[0082] Moreover, in this variation, since the cord folded portion 25 as a fiber layer and the third portion 53 of the bead core wrap 50 as a reinforcing fiber layer exist between the outer wall surface of the tire 1 and the RFID tag 40, the load applied to the RFID tag 40 can be reduced.

[0083] Furthermore, in the present modification, since the RFID tag 40 is disposed at a position relatively close to the outer surface of the tire, it is possible to achieve good communication performance between the outside and the RFID tag 40 .

[0084] Figure 6 It is a partially enlarged cross-sectional view of a half cross section in the tire width direction of a tire 1 according to a second modified example of the present embodiment.

[0085] like Figure 6 As shown, the RFID tag 40 of this modification is arranged between the carcass ply 23 and the flipper 50. More specifically, the RFID tag 40 is arranged between the ply body 24 of the carcass ply 23 and the first portion 51 of the flipper 50.

[0086] In this modification as well, the RFID tag 40 is arranged to be in contact with the flipper 50. Thus, the movement of the RFID tag 40 is restricted by the flipper 50 as the reinforcing fiber layer, and thus the RFID tag 40 is less likely to be affected by deformation of the tire during running.

[0087] Moreover, in this modified example, the RFID tag 40 is disposed between the carcass cord 23 as a fiber layer and the bead flipper 50 as a reinforcing fiber layer, so that the deformation around the RFID tag 40 is small and stress is difficult to concentrate. Accordingly, the RFID tag 40 is difficult to be damaged. In addition, during vulcanization or use, it is possible to prevent the RFID tag 40 from directly pressing the surrounding rubber parts such as the inner liner 29 or the bead outer rubber 22. Accordingly, the surrounding rubber parts are difficult to be damaged.

[0088] Furthermore, in this modified example, between the outer wall surface of the tire 1 and the RFID tag 40, there are the cord folded portion 25 as a fiber layer, the third portion 53 and the first portion 51 of the bead filler 50 as a reinforcing fiber layer, and the bead outer rubber 22. Thus, the RFID tag 40 is arranged on the inner side of the bead outer rubber 22 in the tire width direction, and the distance from the outer wall surface of the tire 1 to the RFID tag 40 becomes longer, thereby further reducing the load applied to the RFID tag 40.

[0089] Figure 7 It is a partially enlarged cross-sectional view of a half cross section in the tire width direction of a tire 1 according to a third modified example of the present embodiment.

[0090] like Figure 7 As shown, the RFID tag 40 of this modification is arranged between the carcass ply 23 and the flipper 50. More specifically, the RFID tag 40 is arranged between the ply folded portion 25 of the carcass ply 23 and the third portion 53 of the flipper 50.

[0091] In this modification as well, the RFID tag 40 is arranged to be in contact with the flipper 50. Thus, the movement of the RFID tag 40 is restricted by the flipper 50 as the reinforcing fiber layer, and thus the RFID tag 40 is less likely to be affected by deformation of the tire during running.

[0092] Moreover, even in this modified example, since the RFID tag 40 is disposed between the carcass cord 23 as a fiber layer and the bead flipper 50 as a reinforcing fiber layer, the deformation around the RFID tag 40 is small and stress is difficult to concentrate. As a result, the RFID tag 40 is difficult to be damaged. In addition, during vulcanization or use, it is possible to prevent the RFID tag 40 from directly pressing surrounding rubber components such as the inner liner 29 or the bead outer rubber 22. As a result, the surrounding rubber components are difficult to be damaged.

[0093] Furthermore, in the present modification, since the carcass folded-back portion 25 as a fiber layer is present between the outer wall surface of the tire 1 and the RFID tag 40 , the load applied to the RFID tag 40 can be reduced.

[0094] Furthermore, in the present modification, since the RFID tag 40 is disposed at a position relatively close to the outer surface of the tire, it is possible to achieve good communication performance between the outside and the RFID tag 40 .

[0095] In addition, the RFID tag 40 may be arranged at a position closer to the outer side in the tire radial direction than the outer end 22A of the bead outer rubber 22 in the tire radial direction. For example, the bead flipper 50 includes an inner portion (first portion 51) covering the inner side of the bead core 21 and the bead outer rubber 22 in the tire width direction, and an outer portion (third portion 53) covering the outer side of the bead core 21 and the bead outer rubber 22 in the tire width direction. The RFID tag 40 may be arranged between the inner portion (first portion 51) of the bead flipper 50 and the outer portion (third portion 53) of the bead flipper 50 at a position closer to the outer side in the tire radial direction than the outer end 22A of the bead outer rubber 22 in the tire radial direction. In this case, the inner portion (first portion 51) and the outer portion (third portion 53) of the bead flipper 50 extend further toward the outer side in the tire radial direction than the outer end 22A of the bead outer rubber 22 in the tire radial direction.

[0096] Even in such a configuration, the RFID tag 40 may be disposed in contact with the flipper 50. Thus, the movement of the RFID tag 40 is restricted by the flipper 50 as the reinforcing fiber layer, and thus the RFID tag 40 is less likely to be affected by deformation of the tire during running.

[0097] Moreover, even in such a configuration, since the RFID tag 40 is disposed between the inner portion (first portion 51) and the outer portion (third portion 53) of the bead core 50 as the reinforcing fiber layer, the deformation around the RFID tag 40 is small, and stress is difficult to concentrate. As a result, the RFID tag 40 is difficult to be damaged. In addition, during vulcanization or use, it is possible to prevent the RFID tag 40 from directly pressing the surrounding rubber components such as the inner liner 29 or the bead outer rubber 22. As a result, the surrounding rubber components are difficult to be damaged.

[0098] In addition, as long as the structure is like this, during manufacturing, the RFID tag 40 is configured on the bead core wrap 50, and then the bead core wrap 50 configured with the RFID tag 40 is wound around the bead core 21 and the bead outer protective rubber 22. Through such a simple operation, the RFID tag 40 can be implanted in the tire in a manner that it is in contact with the bead core wrap 50.

[0099] According to the tire 1 of the present embodiment, the following effects can be achieved.

[0100] (1) The tire 1 according to the present embodiment includes: a pair of bead portions 11 having a bead core 21 and a bead outer rubber 22 extending toward the outer side of the bead core 21 in the tire radial direction; a bead core wrap 50 wrapping at least a portion of the bead core 21; a carcass cord 23 having a cord main body 24 extending from one bead portion 11 toward the other bead portion 11 and a cord folded portion 25 folded back at the bead portion 11 and wrapping the bead core wrap 50; and an RFID tag 40 as an electronic component implanted in the tire in a manner in contact with the bead core wrap 50. In this way, the RFID tag 40 is arranged in a state in contact with the bead core wrap 50 as a reinforcing fiber layer, so that the RFID tag 40 can be protected.

[0101] (2) The tire 1 involved in the present embodiment comprises: an annular tread portion 13 extending along the circumferential direction of the tire; a pair of bead portions 11 having a bead core 21 and a bead outer rubber 22 extending toward the outer side of the bead core 21 in the tire radial direction; a carcass ply 23 having a ply body 24 extending from one bead core 21 toward the other bead core 21, and a ply folded portion 25 folded back around the bead core 21; a bead core wrap 50 arranged between the bead core 21 and the carcass ply 23; and an RFID tag 40 as an electronic component implanted in the tire in a manner contacting with the bead core wrap 50, the tread portion 13 comprising: a steel belt layer 26 as a belt layer arranged on the outer side of the carcass ply 23 in the tire radial direction, the bead core wrap 50 and the steel belt layer 26 having no overlapping portion in the component stacking direction from the tire inner cavity side to the tire outer surface side. In this way, the RFID tag 40 is configured in contact with the tire bead core wrap 50 which serves as a reinforcing fiber layer and has no overlapping portion with the steel belt layer 26. Therefore, the RFID tag 40 can still be protected even when the tire 1 undergoes a large deformation or is impacted.

[0102] (3) The RFID tag 40 of the tire 1 according to the present embodiment is disposed between the bead outer rubber 22 and the bead core wrap 50. Thus, since the RFID tag 40 is disposed between the high modulus bead outer rubber 22 and the bead core wrap 50, the deformation around the RFID tag 40 is small and stress is difficult to concentrate. Accordingly, the RFID tag 40 is difficult to be damaged.

[0103] (4) The RFID tag 40 of the tire 1 according to the present embodiment is disposed between the inner side of the tire bead outer rubber 22 in the tire width direction and the bead core wrap 50. In this way, the RFID tag 40 is disposed at a position farther from the outer surface of the tire 1, thereby further reducing the load applied to the RFID tag 40.

[0104] (5) The RFID tag 40 of the tire 1 according to the present embodiment is disposed between the outer side of the tire bead outer rubber 22 in the tire width direction and the bead core wrap 50. In this way, the RFID tag 40 is disposed at a position close to the outer surface of the tire 1, so that the communication between the outside and the RFID tag 40 can be good.

[0105] (6) The RFID tag 40 of the tire 1 according to the present embodiment is disposed between the carcass ply 23 and the bead flipper 50. Thus, by disposing the RFID tag 40 between the carcass ply 23 and the bead flipper 50, it is possible to prevent the RFID tag 40 from directly pressing the rubber structure of the tire during vulcanization or use.

[0106] (7) The RFID tag 40 of the tire 1 according to the present embodiment is disposed between the carcass body 24 and the flipper 50. Thus, the RFID tag 40 is disposed at a position far from the outer surface of the tire 1, thereby further reducing the load applied to the RFID tag 40.

[0107] (8) The RFID tag 40 of the tire 1 according to the present embodiment is disposed between the ply folded portion 25 and the flipper 50. In this way, the RFID tag 40 is disposed at a position close to the outer surface of the tire 1, so that communication between the outside and the RFID tag 40 can be improved.

[0108] (9) The bead core 50 of the tire 1 according to the present embodiment includes an inner portion (first portion 51) covering the inner side of the bead core 21 and the bead outer rubber 22 in the tire width direction, and an outer portion (third portion 53) covering the outer side of the bead core 21 and the bead outer rubber 22 in the tire width direction, and the RFID tag 40 is arranged between the inner portion (first portion 51) and the outer portion (third portion 53) of the bead core 50 at a position closer to the outer side in the tire radial direction than the outer end 22A of the bead outer rubber 22 in the tire radial direction. In this way, by arranging the RFID tag 40 between the inner portion and the outer portion of the bead core 50, it is possible to prevent the RFID tag 40 from directly pressing the rubber structure of the tire during vulcanization or use.

[0109] (10) At least a portion of the RFID tag 40 of the tire 1 according to this embodiment is disposed within 10 mm radially inward from the radially outer end 22A of the bead filler 22. This ensures ideal communication between the outside and the RFID tag 40.

[0110] (11) The flipper 50 of the tire 1 according to the present embodiment includes an organic fiber cord layer. This can effectively reinforce the bead portion 11 .

[0111] <Second embodiment>

[0112] Next, refer to Figures 8A to 8C , a tire 1 according to a second embodiment is described. In the following description, the same reference numerals are given to the same components as those in the first embodiment, and detailed descriptions thereof are omitted. In the present embodiment, the RFID tag 40 is covered with a protective member 43 made of a rubber sheet.

[0113] Fig. 8A FIG. 4 is a diagram showing an RFID tag 40 covered with a protective member 43 made of a rubber sheet. Fig. 8A In the embodiment, the RFID tag 40 is covered and hidden by a rubber sheet 431 described later. Figure 8B yes Fig. 8A bb cross-section diagram, Figure 8C yes Fig. 8A In this embodiment, as shown in FIG. Figure 8A to Figure 8C As shown, the RFID tag 40 is covered by a protective member 43 .

[0114] The RFID tag 40 includes an RFID chip 41 and an antenna 42 for communicating with an external device. As the antenna 42, various antennas such as a coil-shaped spring antenna, a plate-shaped antenna, and a rod-shaped antenna are used. For example, an antenna formed by printing a predetermined pattern on a flexible substrate may also be used. In consideration of communication performance and flexibility, a coil-shaped spring antenna is most preferred.

[0115] The protection member 43 is composed of two rubber sheets 431 and 432 for sandwiching and protecting the RFID tag 40 .

[0116] The protective member 43 is made of, for example, a rubber having a predetermined modulus. Here, the modulus refers to the 100% elongation modulus (M100) measured in an atmosphere of 23°C according to "3.7 Stress at a given elongation, S" of JIS K6251:2010.

[0117] As the rubber used for the protection member 43 , a rubber having a modulus higher than at least the sidewall rubber 30 can be used.

[0118] For example, as the rubber used for the protection member 43 , based on the modulus of the side wall rubber 30 , it is preferable to use a rubber having a modulus 1.1 to 2 times that of the side wall rubber 30 .

[0119] In addition, the protective component 43 can also be formed by mixing short fiber fillers with rubber. As short fiber fillers, for example, insulating short fibers such as organic short fibers such as aramid short fibers or cellulose short fibers, ceramic short fibers such as alumina short fibers, or inorganic short fibers such as glass short fibers can be used. By mixing such short fiber fillers into rubber, the strength of the rubber can be improved. In addition, as the protective component 43, a rubber sheet in a vulcanized state can also be used. The rubber sheet in a vulcanized state does not undergo plastic deformation like raw rubber, and therefore, the RFID tag 40 can be properly protected.

[0120] In addition, an organic fiber layer such as polyester fiber or polyamide fiber may be provided as the protection member 43. The organic fiber layer may be embedded in the two rubber sheets 431 and 432.

[0121] In this way, as long as the protective member 43 is formed by two rubber sheets 431 and 432, the RFID tag 40 including the protective member 43 can be formed thinly, and therefore, it is suitable for implantation in the tire 1. In addition, when the RFID tag 40 is assembled to the components of the tire 1 before vulcanization, the RFID tag 40 covered with the rubber sheets 431 and 432 can be installed very simply. For example, by utilizing the adhesiveness of raw rubber, the RFID tag 40 covered with the rubber sheets 431 and 432 can be appropriately affixed to the desired position of each rubber component before vulcanization. In addition, the rubber sheets 431 and 432 can be made of raw rubber before vulcanization, thereby making it possible to use the adhesiveness of the rubber sheets 431 and 432 themselves, thereby making it easier to affix.

[0122] However, the protective component 43 is not limited to the form composed of two rubber sheets 431 and 432, and various forms can be adopted. For example, as long as the rubber sheet constituting the protective component covers at least a portion of the RFID tag 40, it is possible to obtain effects such as improved workability in the manufacturing process or stress relief. In addition, for example, it is also possible to have a protective component in which a rubber sheet is wound around the entire circumference of the RFID tag 40, or a potting agent with high viscosity is attached to the entire circumference of the RFID tag 40. Even with such a structure, the RFID tag 40 can be properly protected.

[0123] In addition, for example, Figure 6 as well as Figure 7In the second and third modified examples shown, when the RFID tag 40 is protected by the protective member 43, the RFID tag 40 is sandwiched between the carcass ply 23 and the flipper 50 while being covered by the protective member 43. In this case, even if the RFID tag 40 is subjected to stress due to the relative movement of the carcass ply 23 and the flipper 50, the RFID tag 40 can be protected by the protective member 43. Thus, the durability of the RFID tag 40 is further improved.

[0124] In addition, the RFID tag 40 covered by the protective member 43 is arranged so that the longitudinal direction of the RFID tag 40 is the direction of the tangent line tangent to the circumferential direction of the tire 1, that is, in the Figures 1-2 5 to 7 are implanted in the tire 1 so as to be perpendicular to the paper surface. In the manufacturing process, one surface of the rubber sheets 431 and 432 is attached to a component of the tire 1 before vulcanization.

[0125] By adopting such a configuration, even when the tire 1 is deformed, stress is less likely to be applied to the RFID tag 40. In addition, in the manufacturing process, the work of attaching the RFID tag 40 covered with the protective member 43 becomes simple.

[0126] According to the tire 1 according to the present embodiment, in addition to the above-mentioned (1) to (11), the following effects can be produced.

[0127] (12) In the present embodiment, the RFID tag 40 is covered with the rubber sheets 431 and 432. This improves the workability in the manufacturing process and also can achieve the effect of alleviating the stress applied to the RFID tag 40.

[0128] The tire of the present invention can be applied to various tires for passenger cars, light trucks, trucks, buses, etc., and is particularly suitable for tires for passenger cars.

[0129] In addition, the present invention is not limited to the above-mentioned embodiment, and modifications and improvements made within the scope that can achieve the purpose of the present invention are included in the scope of the present invention.

Claims

1. A tire, characterized in that: The tire has: A pair of bead portions, each bead portion having a bead core and a bead outer rubber extending toward the outer side of the bead core in the tire radial direction; a bead flipper wrapping at least a portion of the bead portion; a carcass ply having a ply main body extending from one bead portion toward the other bead portion and a ply folded back portion folded back at the bead portion and wrapping the flipper; and an electronic component, wherein the electronic component is implanted in the tire in a manner of contacting the bead flipper, The bead flipper includes an inner portion covering the inner side of the bead core and the bead cover in the tire width direction, and an outer portion covering the outer side of the bead core and the bead cover in the tire width direction. The electronic component is arranged between the inner side portion of the bead flipper and the outer side portion of the bead flipper at a position closer to the outer side in the tire radial direction than the outer side end of the bead filler in the tire radial direction. The multiple cords constituting the bead core wrap extend obliquely relative to the radial direction of the tire and are arranged at intervals in the tire circumferential direction in an inclined state. The angle θ formed by the radial direction of the tire and the extension direction of the cords of the bead core wrap is greater than 20° and less than 50°.

2. The tire according to claim 1, characterized in that The flipper includes an organic fiber cord layer.

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