Tire and method of manufacturing the same

Abstract

Provided is a tire in which a conductive member for signal communication and power supply of an electronic device is provided on an inner surface rubber layer, and in which the durability of the conductive member is improved, and a manufacturing method therefor. In a tire provided with an inner surface rubber layer (10) constituting an inner surface of the tire, and a conductive member (20) disposed on the inner surface rubber layer (10), the conductive member (20) is composed of a knitted fabric having stretchability, at least a portion of the knitted fabric is composed of an electrically conductive wire (23), and an elastomer (25) filling a space of the knitted fabric is provided in at least a portion of an electrically conductive portion (21) composed of the electrically conductive wire (23).

Description

Technical Field

[0001] The present invention relates to a tire having conductive components for signal communication and power supply of electronic devices on an inner surface rubber layer, and a method for manufacturing the same. More specifically, the present invention relates to a tire and a method for manufacturing the same that can improve the durability of the conductive components. Background Technology

[0002] In the past, in pneumatic tires, it was possible to install electronic devices on the inner surface of the tire and electrically connect conductive components to the electronic devices, thereby enabling communication and power supply via the conductive components. As such conductive components, conductive wires such as metal wires were provided on the inner surface of the tire (see, for example, Patent Documents 1-5).

[0003] However, because tires deform during driving, excessive tension applied to the wiring due to tire deformation can cause it to break. Furthermore, such a breakage can impair the functionality of electronic equipment. Additionally, repairing wiring located on the inner surface of the tire requires removing the tire from the rim. Therefore, the wiring of electronic equipment requires excellent durability.

[0004] In view of this situation, the following solution has been proposed: by constructing a conductive member made of a knitted fabric containing conductive threads and making the conductive member elastic, the tension applied to the conductive threads can be reduced (see, for example, Patent Document 6). However, even with this structure, the conductive threads may break, thus requiring further improvement.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Publication No. 2007-537090

[0008] Patent Document 2: Japanese Patent Application Publication No. 2016-203829

[0009] Patent Document 3: Japanese Patent Application Publication No. 2017-217953

[0010] Patent Document 4: Japanese Patent Application Publication No. 2015-205528

[0011] Patent Document 5: Japanese Patent Application Publication No. 2019-77296

[0012] Patent Document 6: Japanese Patent No. 7173141 Summary of the Invention

[0013] The problem that the invention aims to solve

[0014] The purpose of this invention is to provide a tire and a method for manufacturing the same, in which a conductive component for signal communication and power supply of electronic devices is disposed on an inner surface rubber layer, thereby improving the durability of the conductive component.

[0015] Solution for solving the problem

[0016] The tire of the present invention for achieving the above-mentioned objectives includes an inner surface rubber layer constituting the inner surface of the tire, and a conductive member disposed on the inner surface rubber layer. The tire is characterized in that the conductive member is made of a stretchable knitted fabric, at least a portion of which is made of conductive threads, and at least a portion of the conductive portion made of the conductive threads is filled with an elastomer that fills the space of the knitted fabric.

[0017] Furthermore, the tire manufacturing method of the present invention is a method for manufacturing the above-described tire. Its features include the following steps: The process of forming an uncured tire having the inner surface rubber layer; The process of impregnating the conductive component with an elastomer and drying the elastomer; The process of attaching the conductive component to the inner surface rubber layer; and The process of vulcanizing the unvulcanized tire together with the conductive component.

[0018] Invention Effects

[0019] In this invention, the conductive member is a stretchable knitted fabric at least partially composed of conductive threads. Therefore, even if the conductive member stretches due to tire deformation, the tension applied to the conductive threads constituting the knitted fabric is reduced, thus suppressing thread breakage. Furthermore, since at least a portion of the conductive portion composed of conductive threads is filled with an elastomer to fill the spaces in the knitted fabric, direct contact between the conductive threads during fabric stretching and contraction is prevented, thereby suppressing fatigue fracture caused by repeated contact and separation of the conductive threads. This improves the durability of the conductive member.

[0020] In this invention, the conductive wire is preferably a metal wire with an insulating sheath. The insulating sheath prevents short circuits at undesired locations in the electrical wiring composed of conductive components. Furthermore, if the insulating sheath is melted by heating, electrical connection between the conductive component and electronic equipment, etc., can be achieved by welding.

[0021] In this invention, preferably, the elastomer is exposed on at least one surface of the knitted fabric, and the conductive member is fixed to the inner surface rubber layer via the elastomer. The conductive member is fixed to the inner surface rubber layer via the elastomer, thereby ensuring that the conductive member effectively follows the movement of the inner surface rubber layer and can transmit electricity while maintaining durability. Furthermore, compared to directly fixing the knitted fabric to the inner surface rubber layer, the stress applied to the knitted fabric can be mitigated, thus improving the durability of the conductive member.

[0022] In this invention, the elastomer preferably comprises a diene rubber. Since diene rubber has sufficient elongation, it can effectively improve the durability of the conductive component. Furthermore, when the inner surface rubber layer of the tire comprises butyl rubber, using a diene rubber in the elastomer filling the space of the knitted fabric can improve the adhesion between the conductive component and the inner surface rubber layer.

[0023] In this invention, preferably, at least a portion of the conductive member is disposed in a flexural region defined between a vertical line drawn from the end of the belt layer embedded in the tread portion toward the inner surface of the tire and a vertical line drawn from the outer diameter end of the bead core embedded in the bead portion toward the inner surface of the tire. In this invention, since the tension applied to the conductive lines due to tire deformation can be mitigated, a significant effect can be achieved when at least a portion of the conductive member is disposed in a flexural region with significant deformation on the inner surface of the tire.

[0024] Preferably, when the conductive component is configured to span the flexural region, it has terminals electrically connected to conductive lines on the outside of the flexural region. The terminals electrically connected to conductive lines are more susceptible to breakage due to tire deformation compared to other parts; therefore, by positioning the terminals on the outside of the flexural region, the durability of the conductive component can be improved.

[0025] In this invention, it is preferable that, when the conductive member has a terminal electrically connected to the conductive line, the region containing the terminal is not filled with an elastomer. If the region containing the terminal is also filled with an elastomer, so that the terminal is covered by the elastomer, it is difficult to solder the wiring member to the terminal. Therefore, it is preferable to have a structure in which the region containing the terminal is not filled with an elastomer.

[0026] In this invention, it is preferable that, when the conductive member has a terminal electrically connected to a conductive line and a wiring member connected to the terminal, the region containing the terminal is also filled with an elastomer. When the conductive member has a terminal and a wiring member already connected to the terminal, even if the region containing the terminal is filled with an elastomer, there is no need to worry about poor soldering between the terminal and the wiring member.

[0027] Furthermore, according to the tire manufacturing method of the present invention, the tire described above can be manufactured efficiently and the durability of the conductive component can be improved by including the following steps: a step of molding an uncured tire having the inner surface rubber layer; a step of impregnating the conductive component with an elastomer and drying the elastomer; a step of attaching the conductive component to the inner surface rubber layer; and a step of curing the uncured tire together with the conductive component. Attached Figure Description

[0028] Figure 1 This is a half-sectional view along the meridian of an inflatable tire constructed according to an embodiment of the present invention.

[0029] Figure 2 This is a perspective view showing an example of a conductive component used in this invention.

[0030] Figure 3 This is a top view of a knitted fabric showing the conductive components used in this invention.

[0031] Figure 4 (a) to (b) are cross-sectional views showing improved examples of the conductive components used in this invention.

[0032] Figure 5 This is a perspective view showing an improved example of the conductive component used in this invention.

[0033] Figure 6 This is a perspective view showing an improved example of the conductive component used in this invention.

[0034] Figure 7 This is an explanatory diagram showing the manufacturing process of the conductive component used in this invention.

[0035] Figure 8 This is an explanatory diagram illustrating an improved example of the manufacturing process of the conductive component used in this invention.

[0036] Figure 9 This is an explanatory diagram illustrating an improved example of the manufacturing process of the conductive component used in this invention.

[0037] Figure 10 This is a radial half-sectional view showing an example of the configuration of electronic equipment in a pneumatic tire.

[0038] Figure 11 It is a three-dimensional diagram showing the connection structure between electronic devices and conductive components.

[0039] Figure 12 This is a perspective sectional view showing other configuration examples of electronic equipment in a pneumatic tire.

[0040] Figure 13This is a perspective sectional view showing other configuration examples of electronic equipment in a pneumatic tire.

[0041] Figure 14 This is a perspective sectional view showing other configuration examples of electronic equipment in a pneumatic tire. Detailed Implementation

[0042] Hereinafter, the structure of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 This refers to a pneumatic tire constructed according to an embodiment of the present invention. Figure 2 and Figure 3 This indicates the conductive component used in this invention. Figure 1 In the diagram, CL represents the tire centerline.

[0043] like Figure 1 As shown, the pneumatic tire of this embodiment includes a tread portion 1 extending circumferentially and formed in an annular shape, a pair of sidewall portions 2, 2 disposed on both sides of the tread portion 1, and a pair of bead portions 3, 3 disposed radially inside these sidewall portions 2. The pneumatic tire has a substantially symmetrical structure on both sides of the tire centerline CL, but it may also have an asymmetrical structure.

[0044] A carcass layer 4 is provided between a pair of bead portions 3, 3. This carcass layer 4 comprises multiple carcass cords extending radially along the tire and folded around the bead core 5 disposed in each bead portion 3 from the inside to the outside of the tire. The carcass cords of the carcass layer 4 are preferably organic fiber cords such as polyester fiber cords. A sidewall core 6, with a triangular cross-section and made of a rubber composition, is disposed on the outer periphery of the bead core 5.

[0045] On the other hand, multiple belt layers 7 are embedded on the outer periphery of the carcass layer 4 of the tread 1. These belt layers 7 are configured to contain multiple belt cords inclined relative to the tire circumference, and the belt cords intersect each other between layers. In the belt layer 7, the inclination angle of the belt cords relative to the tire circumference is set, for example, in the range of 10° to 40°. Steel cords are preferably used as the belt layer cords 7. Multiple main grooves 11 extending along the tire circumference and multiple lateral grooves 12 extending along the tire width direction are formed on the tread 1. In addition to the main grooves 11 and lateral grooves 12, grooves and sipes other than the main grooves 11 and lateral grooves 12 can be provided on the tread 1 as needed.

[0046] To improve high-speed durability, a cover layer 8 is provided on the outer periphery of the belt layer 7, in which reinforcing cords are arranged at an angle of, for example, 5° or less relative to the tire circumference. As the cover layer 8, a full-coverage layer covering the entire width of the belt layer 7 and a pair of edge-coverage layers partially covering the two ends of the belt layer 7 in the tire width direction can be provided separately or in combination. The cover layer 8 can be constructed, for example, by spirally winding a strip profile along the tire circumference, wherein the strip profile is formed by aligning at least one reinforcing cord and covering it with a coating rubber.

[0047] Furthermore, the above-described internal tire structure shows a representative example of a pneumatic tire, but is not limited thereto. An inner surface rubber layer (inner liner) 10 constituting the inner surface S of the tire is disposed inside the carcass layer 4. The inner surface rubber layer 10 is an air-permeable layer and is composed of a rubber composition primarily composed of butyl rubber.

[0048] In the aforementioned pneumatic tires, such as Figure 1 As shown, a strip-shaped conductive member 20 is disposed on the inner surface rubber layer 10 in a manner extending radially along the tire. The conductive member 20 is electrically connected to an electronic device (not shown) for signal communication and power supply of the electronic device. The electronic device is a device that operates by means of electrical energy, and may consist of, for example, a power generation element, sensors for measuring physical quantities such as pressure, temperature, acceleration, electric field, magnetic field, potential, resistance, and gas concentration, actuators such as motors or pumps, communication modules, wireless tags, receiving or transmitting antennas, secondary batteries, contactless power supply coils, and electronic circuit boards.

[0049] like Figure 2 and Figure 3As shown, the conductive member 20 is made of a stretchable knitted fabric, at least a portion of which is composed of conductive threads 23. More specifically, the conductive member 20 is a knitted fabric woven from conductive threads 23 and non-conductive threads 24. Conductive portions 21 composed of conductive threads 23 and non-conductive portions 22 composed of non-conductive threads 24 extend along the length direction of the conductive member 20, and these conductive portions 21 and non-conductive portions 22 are alternately arranged in the width direction of the conductive member 20. Each conductive portion 23 includes a continuous conductive thread 23 along the length direction of the conductive member 20, thus each conductive portion 21 functions as a conductive path along the length direction of the conductive member 20. Furthermore, to ensure the insulation of adjacent conductive portions 21, 21, it is preferable that the width of the non-conductive portion 22 located between adjacent conductive portions 21, 21 is 0.5 mm or more. The knitting method of the conductive member 20 is not particularly limited, as long as the conductive threads 23 are continuous and the knitted fabric is stretchable. The elasticity of the knitted fabric is defined as a breaking elongation of 50% or more from a non-stretched state. A breaking elongation of 100% or more is preferred. Furthermore, the conductive member 20 preferably has a structure in which conductive lines 23 are exposed on both sides of the knitted fabric and are uniformly distributed in the thickness direction.

[0050] like Figure 3 As shown, at least a portion of the conductive portion 21, which is composed of conductive wires 23, is filled with an elastic body 25 that fills the space of the knitted fabric. Figure 3 In this conductive member 20, an elastomer 25 is filled into the knitted fabric constituting the conductive member 20. The elongation at break of the elastomer 25 is preferably greater than the elongation at break of the knitted fabric constituting the conductive member 20. An elongation at break of 400% or more is preferred for the elastomer 25. Examples of preferred elastomers include natural rubber, silicone rubber, and polyurethane elastomers. The volume fraction of the elastomer 25 in the conductive member 20 containing the elastomer 25 is preferably 60% or more.

[0051] The conductive wire 23 is preferably a metal wire with an insulating sheath, especially a copper wire with an insulating sheath. The insulating sheath prevents short circuits at undesired locations in the electrical wiring formed by the conductive member 20. Furthermore, if the insulating sheath is melted by heating, electrical connection between the conductive member 20 and the electronic device can be achieved by welding. As the insulating sheath, resin materials such as polyurethane, polyester, polyvinyl formal, polyethylene, polyvinyl chloride, polyamide, polyamide-imide, polyesterimide, and polyimide are preferred.

[0052] The conductive thread 23 can be a single metal wire (monofilament), but is preferably a multifilament (multifilament) formed by bundling multiple metal wires together. Regarding the diameter of the metal wire, including the insulating sheath, it is preferably in the range of 10μm to 100μm, and more preferably in the range of 20μm to 80μm. Furthermore, it is preferable to bundle three to twelve metal wires together to form one conductive thread 23. For example, a conductive thread 23 formed by bundling seven metal wires with a diameter of 30μm can be exemplified. As the non-conductive thread 24, a thread made of synthetic fibers such as polyester or aramid fibers can be used, for example. The non-conductive thread 24 can also be a thread formed by bundling multiple fibers together. In this case, it is preferable to use a thread formed by bundling more fibers that are finer than the metal wires of the conductive thread 23. Therefore, even with the conductive thread 23 incorporated, the softness of the knitted fabric can be ensured.

[0053] In the aforementioned tire, the conductive member 20 is at least partially composed of a stretchable knitted fabric made of conductive threads 23. Therefore, even if the conductive member 23 stretches due to tire deformation, the tension applied to the conductive threads 23 constituting the knitted fabric is reduced, thus suppressing breakage of the conductive threads 23. Furthermore, since at least a portion of the conductive portion 21 composed of conductive threads 23 is filled with an elastic body 25 that fills the space of the knitted fabric, direct contact between the conductive threads 23 and each other during the stretching and contraction of the knitted fabric is prevented, thereby suppressing fatigue fracture caused by repeated contact and separation of the conductive threads 23. This improves the durability of the conductive member 20.

[0054] Figure 4 (a) to (b) respectively represent improved examples of the conductive components used in this invention. Figure 4 In (a) to (b), the elastomer 25 is exposed on at least one surface of the knitted fabric of the conductive member 20, and the conductive member 20 is fixed to the inner surface rubber layer 10 via the elastomer 25. The elastomer 25 can be as follows: Figure 4 (a) the surfaces of the knitted fabric exposed on both sides of the conductive member 20, or as shown in the image. Figure 4(b) The conductive member 20 is exposed on only one side of the knitted fabric. The conductive member 20 is fixed to the inner surface rubber layer 10 via the elastomer 25, thus the conductive member 20 effectively follows the movement of the inner surface rubber layer 10, enabling power transmission while maintaining durability. Furthermore, compared to directly fixing the knitted fabric to the inner surface rubber layer 10, the stress applied to the knitted fabric is mitigated, thereby improving the durability of the conductive member 20. For example, when the knitted fabric is bonded to the inner surface rubber layer 10 using an adhesive, the adhesive impregnates and cures, thereby hindering the elasticity of the knitted fabric or interfering with its movement, making the conductive thread 23 prone to breakage. However, as described above, the elastomer 25 is exposed on at least one surface of the knitted fabric with the conductive member 20. By bonding the conductive member 20 to the inner surface rubber layer 10 via the elastomer 25, the knitted fabric structure can be protected. It should be noted that the methods of fixing the conductive member 20 to the inner surface rubber layer 10 via the elastomer 25 include mechanical fixing, fixing using adhesives, fixing using adhesives, fixing using vulcanization bonding, etc.

[0055] In the aforementioned tire, the elastomer 25 preferably comprises a diene rubber. The glass transition temperature (Tg) of the diene rubber is preferably in the range of -80°C to 0°C. Since the diene rubber has sufficient elongation, it can effectively improve the durability of the conductive component 20. Furthermore, when the inner surface rubber layer 10 of the tire comprises butyl rubber, using a diene rubber in the elastomer 25 that fills the space of the knitted fabric can improve the adhesion between the conductive component 20 and the inner surface rubber layer 10. When the elastomer 25 comprises a diene rubber, it is preferable that it does not contain carbon reinforcement, has a lower modulus of elasticity than the inner surface rubber layer 10, and has an elongation at break in the range of 500% to 900%.

[0056] In the aforementioned tires, such as Figure 1 As shown, it is preferable that at least a portion of the conductive member 20 is disposed in the flexural region Fx, which is defined between a vertical line drawn from the end of the belt layer 7 embedded in the tread portion 1 toward the inner surface S of the tire and a vertical line drawn from the outer diameter end of the bead core 5 embedded in the bead portion 3 toward the inner surface S of the tire. In this invention, since the tension applied to the conductive line 23 due to tire deformation can be mitigated, a significant effect can be achieved when at least a portion of the conductive member 20 is disposed in the flexural region Fx of the inner surface S of the tire, where deformation is large.

[0057] When the conductive member 20 is configured to span the flexural region Fx, it is preferable to have a terminal 30 on the outside of the flexural region Fx that is electrically connected to the conductive line 23. Figure 1In the conductive member 20, terminals 30 are respectively provided at locations further radially outward from the flexural region Fx and further radially inward from the flexural region Fx. Since the terminals 30, which are electrically connected to the conductive wire 23, are prone to breakage due to tire deformation, the durability of the conductive member 20 can be improved by placing the terminals 30 on the outer side of the flexural region Fx.

[0058] Of the tires mentioned above, the preferred type is, for example, Figure 5 As shown, when the conductive member 20 has a terminal 30 that is electrically connected to the conductive line 23, the region containing the terminal 30 is not filled with the elastomer 25. In other words, it is preferable to fill the region X1 of the conductive member 20, excluding the terminal 30, with the elastomer 25. If the region containing the terminal 30 is also filled with the elastomer 25, so that the terminal 30 is covered by the elastomer 25, it will be difficult to solder the wiring component to the terminal 30.

[0059] Of the tires mentioned above, the preferred type is, for example, Figure 6 As shown, when the conductive member 20 has a terminal 30 electrically connected to the conductive line 23 and a wiring member 31 pre-connected to the terminal 30, an elastomer 25 is also filled in the area containing the terminal 30. In other words, it is preferable to fill the entire area X2 of the conductive member 20 containing the terminal 30 with the elastomer 25. When the conductive member 20 has a terminal 30 and a wiring member 31 already connected to the terminal 30, even if the area containing the terminal 30 is filled with the elastomer 25, there is no need to worry about poor soldering between the terminal 30 and the wiring member 31.

[0060] Next, the manufacturing method of the above-mentioned pneumatic tire will be described. First, an uncured tire is formed, which includes a carcass layer 4, a bead core 5, a sidewall core 6, a belt layer 7, a cover layer 8, and an inner surface rubber layer 10. Meanwhile, an elastomer 25 is impregnated with a conductive member 20 and dried. Then, in the uncured tire, the conductive member 20 filled with the elastomer 25 is adhered to the inner surface rubber layer 10. Next, the uncured tire and the conductive member 20 are vulcanized together. This allows for the efficient manufacture of a tire with a conductive member 20 and improves the durability of the conductive member 20.

[0061] The above-described tire manufacturing method is a preferred method, but it is not limited thereto. For example, the conductive component 20 can also be adhered to the inner surface rubber layer 10 after the tire has been vulcanized using conventional methods.

[0062] Figures 7-9 These respectively represent the manufacturing processes of the conductive components used in this invention. In Figures 7-9 In the process, liquid elastomer 35, represented by natural rubber latex, is stored in a bath 36. Figure 7In this process, the conductive member 20 is continuously immersed in a liquid elastomer 35 to fill the conductive member 20 with the elastomer 35, and then the conductive member 20 is cut into a specified length. Figure 8 In the case where a conductive member 20 cut to a specified length has a terminal 30 that is electrically connected to a conductive line 23, the conductive member 20 is filled with an elastomer 25 by immersing only the region X1 of the conductive member 20 other than the terminal 30 in a liquid elastomer 35. Figure 9 In the case where a conductive member 20 cut to a specified length has a terminal 30 electrically connected to a conductive line 23 and a wiring member 31 pre-connected to the terminal 30, the conductive member 20 is filled with an elastomer 25 by immersing the entire region X2 of the conductive member 20 containing the terminal 30 in a liquid elastomer 35.

[0063] Figure 10 This illustrates an example of the configuration of electronic devices in a pneumatic tire. Figure 11 This indicates the connection structure between electronic devices and conductive components. Figure 10 In this tire, an electronic device 40 is provided on the inner surface S of the tire, and the electronic device 40 is positioned at the tire centerline CL. One end of a conductive member 20 disposed on the inner surface rubber layer 10 is electrically connected to the electronic device 40, and the other end extends toward the bead portion 3. Figure 11 As shown, the electronic device 40 includes a substrate 41, a pair of terminals 42 mounted on the substrate 41, various electronic components 43 mounted on the substrate 41, and wiring 44 connecting the terminals 42 and the electronic components 43 to each other. The electronic device 40 is electrically connected to a pair of conductive portions 21 of the conductive member 20 via the pair of terminals 42. Preferably, the spacing between the pair of terminals 42 in the electronic device 40 is equal to the spacing between the pair of conductive portions 21 in the conductive member 20. In this case, the terminals 42 of the electronic device 40 can be directly connected to the conductive portions 21 of the conductive member 20 by soldering or the like without using other wires.

[0064] Figures 12-14 These examples illustrate the configuration of electronic equipment in a pneumatic tire. For instance... Figures 12-14 As shown, electronic device 40 is disposed on the inner surface S of the tire, and conductive member 20 is configured to extend from electronic device 40 along the inner surface S of the tire. Figure 12 In this process, the wider conductive components 20 are connected to the large electronic devices 40 that require a large amount of power from both sides of the tire width direction, and each conductive component 20 is used as a positive or negative terminal wiring. Figure 13 and Figure 14 In this configuration, the conductive member 20 is connected to a small electronic device 40 driven by a small amount of electricity from one side in the width direction of the tire, and each conductive part 21 of the conductive member 20 is used as a wiring for a positive or negative electrode. Figure 13In the middle, the conductive member 20 extends along the width direction of the tire, and opposite to this, Figure 14 In the middle, the conductive member 20 extends in a direction inclined relative to the width direction of the tire.

[0065] Example

[0066] Tires of Examples 1-5 were manufactured, with a tire size of 245 / 40R19. They included an inner surface rubber layer constituting the inner surface of the tire and a conductive member disposed on the inner surface rubber layer. The conductive member was made of a stretchable knitted fabric, which included a conductive portion composed of conductive threads and a non-conductive portion composed of non-conductive threads. An elastomer was filled into at least a portion of the conductive portion composed of conductive threads to fill the space in the knitted fabric. The type of elastomer and the volume percentage of the elastomer in the overall volume of the conductive member filled with the elastomer were set as shown in Table 1. Furthermore, a tire of Comparative Example 1, in which no elastomer was filled in the conductive member, was prepared.

[0067] In Examples 1-5, natural rubber (A), silicone rubber (B), or polyurethane elastomer (C) were used as the elastomer.

[0068] For these test tires, the durability of the conductive components was evaluated using the following evaluation method, and the results are shown in Table 1.

[0069] Durability of conductive components: Each test tire was assembled onto a 19×8J rim size wheel, with the air pressure set to 150 kPa. The tires were then mounted on a smooth steel drum testing machine with a diameter of 1707 mm. A 3000 km driving test was conducted under the following conditions: ambient temperature controlled at 38±3℃, speed set at 120 km / h, and load set to 100% of the maximum JATMA load. After the driving test, the overall resistance of the conductive component was measured (the resistance value measured between the two ends of the conductive component with all conductive parts short-circuited). The evaluation results were expressed as the reciprocal of the measured value, with Comparative Example 1 set to 100. A higher exponent value indicates better durability of the conductive component.

[0070]

[0071] As shown in Table 1, the tires of Examples 1 to 5 improved the durability of the conductive components compared to Comparative Example 1.

[0072] Explanation of reference numerals in the attached figures

[0073] 1: Fetal face

[0074] 2: Side wall portion

[0075] 3: Bead area

[0076] 4: Fetal body layer

[0077] 5: Tire bead core

[0078] 6: Tire sidewall core

[0079] 7: Belt layer

[0080] 8: With cover layer

[0081] 10: Inner surface rubber layer

[0082] 20: Conductive components

[0083] 21: Conductive part

[0084] 22: Non-conductive part

[0085] 23: Conductive wire

[0086] 24: Non-conductive line

[0087] 25: Elastomers

[0088] 30: Terminal

[0089] 31: Wiring components

[0090] 40: Electronic devices

Claims

1. A tire, the tire comprising an inner surface rubber layer constituting an inner surface of the tire, and a conductive member disposed on the inner surface rubber layer. Its features are, The conductive member is made of a stretchable knitted fabric, at least a portion of which is made of conductive threads, and at least a portion of the conductive portion made of the conductive threads is filled with an elastomer that fills the space of the knitted fabric.

2. The tire according to claim 1, characterized in that, The conductive wire is a metal wire with an insulating outer sheath.

3. The tire according to claim 1 or 2, characterized in that, The elastomer is exposed on at least one surface of the knitted fabric, and the conductive member is fixed to the inner surface rubber layer via the elastomer.

4. The tire according to claim 3, characterized in that, The elastomer comprises diene rubber.

5. The tire according to any one of claims 1 to 4, characterized in that, At least a portion of the conductive member is disposed in a flexural region defined between a vertical line drawn from the end of the belt layer embedded in the tread portion toward the inner surface of the tire and a vertical line drawn from the outer diameter end of the bead core embedded in the bead portion toward the inner surface of the tire.

6. The tire according to claim 5, characterized in that, The conductive member is configured to span the flexural region and has a terminal on the outside of the flexural region that is electrically connected to the conductive line.

7. The tire according to any one of claims 1 to 6, characterized in that, The conductive member has a terminal electrically connected to the conductive line, and the region containing the terminal is not filled with the elastomer.

8. The tire according to any one of claims 1 to 6, characterized in that, The conductive member has a terminal electrically connected to the conductive line and a wiring member connected to the terminal, and the elastomer is also filled in the region containing the terminal.

9. A method for manufacturing a tire, wherein the method for manufacturing a tire according to any one of claims 1 to 8, Its features The process includes the following steps: The process of forming an uncured tire having the inner surface rubber layer; The process of impregnating the conductive component with an elastomer and drying the elastomer; The process of attaching the conductive component to the inner surface rubber layer; and The process of vulcanizing the unvulcanized tire together with the conductive component.

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