Tire and tire manufacturing method

Abstract

To provide a technique concerning a tire from which an RFID tag hardly comes off during use.SOLUTION: A tire 10 comprises a resin skeleton body 20 that is formed of thermoplastic resin and has a bead part 12, a side part 14 and a crown part 16, and an RFID tag 70 mounted on an inclined part 48 in the bead part 12.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a tire and a method for manufacturing a tire.

Background Art

[0002] Patent Document 1 discloses a tire having an annular resin tire skeleton member including a bead portion, a side portion continuous with the radially outer side of the bead portion in the tire diameter direction, and a crown portion continuous with the inner side of the side portion in the tire width direction, and an RFID tag attached to the outer surface of the side portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure aims to provide a technique related to a tire in which an RFID tag is difficult to come off during use.

Means for Solving the Problems

[0005] A tire according to a first aspect includes a resin skeleton formed of a thermoplastic resin, having a bead portion, a side portion, and a crown portion, and an RFID tag attached to an inner surface in the tire axial direction in the bead portion.

[0006] In this tire, the RFID tag is attached to the inner surface in the tire axial direction in the bead portion of the resin skeleton. In the tire according to this aspect, since the RFID tag is attached to the inner surface in the tire axial direction in the bead portion, the RFID tag is difficult to come off during use of the tire.

[0007] In the tire of the second aspect, in the tire described in the first aspect, the RFID tag is attached to a rubber layer that covers the bead portion from the side portion of the resin skeleton body.

[0008] In the tire according to this aspect, since the RFID tag is attached to the rubber layer covering the resin skeleton body, the deformation of the tire is less likely to be transmitted to the RFID tag. Therefore, according to the tire according to this aspect, the RFID tag is less likely to shift from the attached position even during the use of the tire compared to the case where the RFID tag is directly attached to the resin skeleton body.

[0009] In the tire of the third aspect, in the tire described in the first aspect, the RFID tag is covered by a rubber layer that covers the bead portion from the side portion of the resin skeleton body.

[0010] In the tire according to this aspect, the RFID tag is covered by a rubber layer that covers the resin skeleton body. Therefore, according to the tire according to this aspect, the RFID tag is less likely to shift from the attached position compared to the case where the RFID tag is not covered by the rubber layer even during the use of the tire.

[0011] In the tire of the fourth aspect, in the tire described in any one of the first to third aspects, the RFID tag is coated with resin and attached to the resin skeleton body via an adhesive layer.

[0012] In this tire, since the RFID tag is attached via the adhesive layer in a state where the RFID tag is coated with resin, the RFID tag deforms following the deformation of the resin skeleton body. Therefore, according to the tire according to this aspect, the RFID tag is less likely to come off from the resin skeleton body compared to the case where the RFID tag is attached without passing through the adhesive layer.

[0013] In the tire of the fifth aspect, in the tire described in any one of the first to third aspects, the RFID tag is coated with rubber and attached to the resin skeleton body via an adhesive layer.

[0014] Since this tire has an RFID tag covered with rubber and is attached via an adhesive layer, the RFID tag deforms following the deformation of the resin skeleton. Further, since this tire has an RFID tag covered with rubber, the RFID tag is likely to deform following the deformation of the resin skeleton. Therefore, according to the tire according to this aspect, the RFID tag is less likely to come off from the resin skeleton compared to the case where the RFID tag is attached without passing through the adhesive layer and the case where the RFID tag is not covered with rubber.

[0015] The method for manufacturing a tire according to the sixth aspect includes a procedure of holding a bead core at an inner end in the radial direction in an inner mold using a holding mold, a procedure of forming a cavity using an outer mold facing the wall surface of the inner mold with a gap, a procedure of injecting a resin material into the cavity to form a resin skeleton having a bead portion, a side portion, and a crown portion, and a procedure of attaching an RFID tag in the tire axial direction of the bead portion in the formed resin skeleton.

[0016] In this method for manufacturing a tire, an RFID tag is attached to the inner surface in the tire axial direction of the bead portion in the resin skeleton. Here, among the tires having a resin skeleton, the inner portion in the tire axial direction in the bead portion is less likely to deform during use than other portions. Therefore, according to the method for manufacturing a tire according to this aspect, a tire in which the RFID tag is less likely to come off during use can be obtained compared to the case where the RFID tag is attached to a portion other than the inner surface in the tire axial direction of the bead portion of the resin skeleton.

Advantages of the Invention

[0017] According to the present disclosure, it is possible to provide a technique related to a tire in which an RFID tag is less likely to come off during use.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0019] Hereinafter, an example of an embodiment of the present disclosure will be described with reference to the drawings. In each drawing, the same or equivalent components and parts are given the same reference numerals. Also, the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios.

[0020] Also, the arrow R shown in each figure indicates the radial direction of the tire 10, the arrow W indicates the width direction (axial direction) of the tire 10, and the arrow θ indicates the circumferential direction of the tire 10. In the present disclosure, the "outer side of the tire" refers to the outer side in both the radial direction and the width direction of the tire, and coincides with the direction in which the arrows R and W point in each figure.

[0021] Note that the method for measuring the dimensions of each part is based on the method described in the 2023 edition YEAR BOOK issued by JATMA (Japan Automobile Tire Manufacturers Association).

[0022] In the present disclosure, a thermoplastic resin (including thermoplastic elastomers) refers to a polymer compound that softens, flows, and hardens into a relatively hard and strong state as the temperature rises and cools. In this specification, among them, a polymer compound that softens, flows, and hardens into a relatively hard and strong state as the temperature rises and cools and has rubber-like elasticity is defined as a thermoplastic elastomer, and a polymer compound that softens, flows, and hardens into a relatively hard and strong state as the temperature rises and cools and does not have rubber-like elasticity is distinguished as a thermoplastic resin that is not an elastomer.

[0023] Examples of thermoplastic resins (including thermoplastic elastomers) include polyolefin-based thermoplastic elastomers (TPO), polystyrene-based thermoplastic elastomers (TPS), polyamide-based thermoplastic elastomers (TPA), polyurethane-based thermoplastic elastomers (TPU), polyester-based thermoplastic elastomers (TPC), and dynamically crosslinked thermoplastic elastomers (TPV), as well as polyolefin-based thermoplastic resins, polystyrene-based thermoplastic resins, polyamide-based thermoplastic resins, and polyester-based thermoplastic resins.

[0024] (Configuration) Figures 1 and 2 show a tire 10 according to the present disclosure. The tire 10 according to the present disclosure includes a pair of bead portions 12, a side portion 14 extending radially outward from the bead portion 12 in the tire 10, and a crown portion 16 (outer peripheral portion) connecting the radially outer ends of the tire 10 of one side portion 14 and the radially outer ends of the tire 10 of the other side portion 14, and includes a tire skeleton member 17. The tire skeleton member 17 is provided with a belt layer 32 formed of a resin cord member 26 on the outer side in the radial direction of the tire 10, and a tread layer 30 is provided on the outer side in the radial direction of the tire 10 of the belt layer 32, whereby the tire 10 is formed.

[0025] In the present disclosure, the radial direction, the width direction, and the circumferential direction of the tire half body 17A coincide with the radial direction, the width direction, and the circumferential direction of the tire 10 as shown in FIG. 1.

[0026] FIG. 2 is a cross-sectional view along the width direction of the tire 10 showing an example of the configuration of the tire 10 according to the present embodiment.

[0027] As shown in FIG. 2, the belt layer 32 is formed by winding the resin cord member 26 around the outer periphery of the tire skeleton member 17 in the circumferential direction of the tire 10 and joining it to the tire skeleton member 17. Further, the belt layer 32 is configured by joining portions adjacent to each other in the width direction of the tire 10 in the resin cord member 26. The resin cord member 26 is configured by covering a cord member with a coating resin layer.

[0028] On the outer peripheral side in the radial direction of the tire 10 of the belt layer 32, a tread layer 30 made of rubber, which is a material having better wear resistance than the resin material constituting the tire skeleton member 17, is disposed.

[0029] The cord member coated with resin in the resin cord member 26 is composed of a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (twisted wire) obtained by twisting these fibers. Examples of the resin cord member 26 include a monofilament (single wire) composed of a single metal cord, a multifilament (twisted wire) obtained by twisting a plurality of metal cords, and the like.

[0030] In FIG. 2, the cross-sectional shape of the resin cord member 26 (the shape of the cross-section orthogonal to the longitudinal direction of the resin cord member 26) is substantially rectangular, but the resin cord member 26 according to the present embodiment is not limited thereto and can have various shapes such as a substantially parallelogram.

[0031] The tread layer 30 is a portion provided on the circumferential surface 52C which is the outer circumferential surface of the tire 10, and is formed by winding a member such as rubber around the belt on the outer side in the radial direction of the tire 10.

[0032] As shown in FIG. 2, the tire skeleton member 17 includes a pair of tire halves 17A each having a bead portion 12, a side portion 42, and a resin skeleton body 20 integrally formed of a thermoplastic resin with a half-width crown portion 44. As shown in FIG. 1, the pair of tire halves 17A are opposed to each other and joined at the tire equatorial plane portion.

[0033] Also, as shown in FIG. 2, the tire half 17A has a bead portion 12, a knitted layer 41, and a resin skeleton body 20 in which the knitted layer 41 is disposed on the outer side in the radial direction of the tire 10 from the bead core 18 to the crown portion 44 and integrated. Further, as shown in FIG. 2, the tire 10 according to the present embodiment is provided with an RFID (Radio Frequency IDentification) tag 70. The resin skeleton body 20 is formed of a thermoplastic resin. In the resin skeleton body 20 in the present embodiment, the knitted layer 41 and the bead core 18 are integrated as a primary molded body 34 described later and then integrated into the resin skeleton body 20.

[0034] In addition, in the present embodiment, the ranges of the bead portion 12, the side portion 14, and the crown portion 16 are determined based on the dimensions when the tire 10 is used. More specifically, the bead portion 12 is a range where the thickness gradually decreases toward the radially outer side with respect to the range H from the radially inner end to the radially outer end excluding the tread layer 30 and the belt layer 32, and is the portion of the range H1. Further, the side portion 14 is a range where the thickness is approximately equal, and is the portion of the range H2 excluding the range H1 with respect to the range H.

[0035] As shown in FIG. 2, an annular bead core 18 made of a resin-coated steel cord and having a substantially rectangular cross section as an example is embedded in the bead portion 12. More specifically, as shown in FIG. 2, the bead portion 12 has a thick portion 50 that is thicker than the side portion 14 and in which the bead core 18 is embedded, and an inclined portion 48 that connects the thick portion 50 to the side portion 14.

[0036] The thick portion 50 abuts against a rim flange (not shown) and has a function of preventing the bead portion 12 from coming off the rim flange. The thick portion 50 has a thick portion outer peripheral surface 50E that abuts against the flange portion of the rim flange (not shown) in the width direction, a thick portion bottom surface 50B that contacts the rim flange (not shown) from the radially outer side, and a thick portion inner peripheral surface 50I that is the inner surface in the width direction with respect to the thick portion bottom surface 50B. The thick portion bottom surface 50B is along the axis (width direction) of the tire 10 or is inclined so as to approach the central axis of the tire 10 toward the inner side in the width direction of the tire 10 from the heel portion 50H that is the boundary with the thick portion outer peripheral surface 50E. Further, the thick portion outer peripheral surface 50E is, as an example, along the radially outer side from the heel portion 50H or is slightly inclined toward the inner side in the tire width direction. The thick portion inner peripheral surface 50I is, as an example, along the radially outer side from the toe portion 50T that is the boundary with the thick portion inner peripheral surface 50I or is slightly inclined toward the inner side in the width direction of the tire 10.

[0037] The inclined portion 48 has a function of dispersing the stress of the side portion 14 that deforms due to the load during the use of the tire 10. The outer peripheral surface 48E of the inclined portion 48 connects the thick portion outer peripheral surface 50E of the thick portion 50 and the outer peripheral surface of the side portion 14 in a bowed shape with the tire width direction slightly recessed and curved. Further, by connecting the inner peripheral surface 48I of the inclined portion 48 with the thick portion inner peripheral surface 50I of the thick portion 50 and the inner peripheral surface of the side portion 14, the inclined portion 48 gradually decreases in thickness from the thick portion 50 side (radially inward) toward the side portion 14 side (radially outward).

[0038] (RFID tag) As shown in FIGS. 3(A) and 3(B), the RFID tag 70 includes a main body chip 72 and an antenna 74. The main body chip 72 includes a processor including a CPU or MPU and a memory capable of storing various information. The antenna 74 extends from the main body chip 72 to one side and the other side.

[0039] The main body chip 72 and the antenna 74 are embedded in a resin coating portion 76 formed of a resin material. The resin material forming the resin coating portion 76 is preferably the same type of material as the resin material forming the resin skeleton body 20. The embedding in the resin coating portion 76 may be sandwiched with a film-like material, or the thickness of the main body chip 72 may be absorbed by the thick resin coating portion 76. The RFID tag has flexibility in the thickness direction as shown in FIG. 3(B). Further, the RFID tag 70 is arranged such that the longitudinal direction in which the antenna 74 extends is along the tire circumferential direction.

[0040] Also, as shown in FIG. 2, in this embodiment, the RFID tag 70 is attached to the inclined portion 48 using an adhesive. More specifically, the RFID tag 70 is attached to the inner peripheral surface 48I of the inclined portion 48, which is the inner surface of the tire half body 17A within the range H1 of the bead portion. Note that the RFID tag 70 is located within the range from the inner end in the tire radial direction to 1 / 2 within the range H1 of the bead portion.

[0041] Further, the RFID tag 70 is attached to the tire half 17A via the adhesive layer 90. Note that any type of adhesive layer 90 (adhesive) may be used. As an example, double-sided tape having a base material such as paper or cellophane, double-sided tape without a base material, or adhesive coating may be mentioned.

[0042] Also, as shown in FIG. 2, a rubber layer 24 is formed on the outer side in the width direction of the tire 10 from the bead portion 12 to the crown portion 44 of the tire half 17A. More specifically, the rubber layer 24 is formed across the outer peripheral surface of the side portion 14 from the crown portion 44, the outer peripheral surface 48E of the inclined portion 48 in the bead portion 12, the outer peripheral surface 50E of the thick portion, the bottom surface 50B of the thick portion, and the inner peripheral surface 50I of the thick portion. This rubber layer 24 protects the tire half 17A from sunlight and the like and improves the weather resistance when the tire 10 is incorporated into a wheel.

[0043] (Primary molded body 34) FIG. 5 is a view showing the primary molded body 34 included in the tire half 17A according to the present disclosure. As shown in FIG. 5, the primary molded body 34 includes a knitted fabric layer 41 having a knitted fabric body 36 and a reinforcing body 40, and a bead core 18.

[0044] As shown in FIGS. 5 and 6, the knitted fabric body 36 is formed of a filamentous first fiber material 38, has a folded mesh shape continuously formed in the circumferential direction and the radial direction of the tire 10, has ends on both sides in the radial direction of the tire 10, and is endless in the circumferential direction of the tire 10. That is, the knitted fabric body 36 is a member formed by being knitted in a ring shape by the first fiber material 38 and has elasticity in the radial direction and the circumferential direction (the vertical and horizontal directions in the drawing in FIG. 6).

[0045] Further, as will be described later, the first fiber material 38 is formed of a material that is compatible with the resin coating of the resin skeleton 20 and the bead core 18. Specifically, it is a material such as a polyester-based thermoplastic elastomer, and a resin of the same type as the resin skeleton 20 is preferably used. In the present disclosure, compatibility refers to the property that materials of different members are likely to mix with each other in a molten state.

[0046] As shown in FIGS. 5 and 6, the reinforcing member 40 is formed of a reinforcing fiber material, extends in the tire radial direction, and is equally distributed in the tire circumferential direction by being knitted into the circumferential direction of the tire 10 in the knitted body 36, and is a filamentous member that restricts the radial elongation of the tire 10 of the knitted body 36. Further, as will be described later, the reinforcing fiber material is formed of a material that is not compatible with the resin skeleton 20. Specifically, a material having a higher softening temperature and higher tensile strength than the first fiber material 38, such as aramid fiber or steel cord, is adopted. Further, the reinforcing fiber material is not limited to a single material, and a fiber body coated with a resin of the same system as the first fiber material 38 on an artificial resin such as aramid fiber or a steel cord may be used. The shape and number of the reinforcing members 40 are appropriately determined according to the specifications of the tire 10 to be manufactured. In addition, the above-mentioned equal distribution means that it is sufficient if a plurality of reinforcing members 40 are at approximately equal intervals when viewed macroscopically. The reinforcing members 40 are preferably arranged at about 10 to 60 per mm in the tire circumferential direction.

[0047] Note that the knitted body 36 is not limited to any knitting method as long as it has elasticity in the radial and circumferential directions of the tire 10 as described above, but is formed by, for example, knitting. In other words, the primary molded body 34 in the present disclosure has a so-called inlay structure in which a reinforcing fiber material is knitted into the knitted body 36.

[0048] Further, the shape of the knitted body 36 is appropriately determined according to the specifications of the tire 10 to be manufactured, but it is shaped to be arranged from the bead core 18 to the crown portion 44 in the resin skeleton 20 (see also FIGS. 7 and 10).

[0049] Note that the resin coating of the bead core 18 and the knitted fabric body 36 are made of mutually compatible materials, and the knitted fabric body 36 and the resin coating of the bead core 18 can be welded together. Therefore, the bead core 18 in the present embodiment is welded to the inner end in the radial direction of the tire 10 in the knitted fabric body 36.

[0050] Subsequently, with appropriate reference to FIGS. 5 to 10, a method for manufacturing a tire half and a method for manufacturing a tire according to the present disclosure will be described. The method for manufacturing a tire half according to the present disclosure includes a primary molding step, a fixing step, a mold clamping step, and an injection step.

[0051] (Primary molding step) In the primary molding step, an annular bead core 18 is integrated with the inner end in the radial direction of the tire 10 in the knitted fabric layer 41 to form a primary formed body.

[0052] (Fixing step) FIG. 7 is a diagram for explaining a state in which the primary formed body is disposed in the inner mold 52 that expands in the radial direction. In the fixing step, the outer end in the radial direction of the primary formed body is hung on the outer peripheral surface 52C in the radial direction of the inner mold 52 in the inner mold 52. More specifically, as shown in FIG. 7, the primary molded body 34 is formed into a cylindrical shape by arranging a plurality of parts in the circumferential direction. With respect to the inner mold 52, it is covered so as to cover from one axial side (the right side of the drawing in FIG. 7, the lower side of the drawing in FIG. 8) to the other axial side (the left side of the drawing in FIG. 7, the upper side of the drawing in FIG. 8). Further, the bead core 18 is located on one axial side of the inner mold 52. As shown in FIG. 7, the primary formed body is not fixed on the other axial side, and the primary molded body 34 is covered with the inner mold 52 as the knitted fabric body 36 contracts in the axial and radial directions of the inner mold 52, and maintains a state along the wall surface (the outer side in the radial direction of the circumferential surface 52C and the side surface 52S) of the inner mold 52.

[0053] Note that on one axial side (inner side) of the inner mold 52, a plurality of slide molds 54 that can move further toward one axial side from the side surface 52S on one axial side of the inner mold 52 are provided with gaps in the tire circumferential direction. As shown in FIG. 8, the slide mold 54 is recessed toward one axial side, and the bead core 18 is disposed in the recess of the slide mold 54. Note that as shown in FIG. 9, where there is no slide mold 54 in the tire circumferential direction of the inner mold 52, the bead core 18 is disposed with a gap from the inner mold 52.

[0054] Although not shown in FIG. 7, on one axial side of the inner mold 52, an outer mold 56 that covers one axial side and the radial direction of the inner mold 52 and forms a void is disposed opposite to the inner mold 52.

[0055] (Mold clamping process) Subsequently, in the mold clamping process, the cavity C is formed using the circumferential surface 52C of the inner mold 52 and the outer mold 56 that faces the side surface 52S of the inner mold 52 with a gap. More specifically, from the state shown in FIG. 7, the outer mold 56 that covers one axial side and the radial direction of the inner mold 52 is brought closer from one axial side of the inner mold 52, and a cavity C, which is a void, is formed between the side surface 52S and the circumferential surface 52C of the inner mold 52 and the inner surface 56I of the outer mold 56. Further, in the state where the cavity C is formed, by moving the slide mold 54 toward one axial side, the bead core 18 is pressed against the inner surface 56I of the outer mold 56 as shown in FIG. 8. This cavity C has the same shape as the tire half 17A according to the present disclosure, and the tire half 17A is formed by pouring molten thermoplastic resin into the cavity C as will be described later.

[0056] That is, in the present disclosure, the radial direction, the width direction, and the circumferential direction of the inner mold 52 coincide with the radial direction, the width direction, and the circumferential direction of the tire 10 as shown in FIG. 1. Further, the slide mold 54 according to the present embodiment is an example of a "holding mold".

[0057] In the state shown in FIG. 8, on one axial side of the inner mold 52, a gate portion 58 for injecting a thermoplastic resin, which will be described later, is formed radially inward with respect to the bead core 18.

[0058] Also, as shown in FIG. 8, the knitted fabric body 36 of the primary molded body 34 extends in the axial and radial directions of the inner mold 52 in a state of being hung on the inner mold 52, so a shrinking force acts, and inside the cavity C, it is in contact with the inner mold 52 from the side surface 52S to the circumferential surface 52C.

[0059] (Injection process) Subsequently, from the state shown in FIG. 8, the molten thermoplastic resin is injected into the cavity C through the gate portion 58. In this case, since the gate portion 58 is provided radially inward of the inner mold 52 than the bead core 18, the knitted fabric body 36 is pressed against the inner surface 56I of the outer mold 56 in the cavity C by the thermoplastic resin melted through the gate portion 58 as shown in FIG. 10. And in a state where the knitted fabric body 36 is pressed against the inner surface 56I of the outer mold 56, the thermoplastic resin cools, and the tire half 17A is formed in the cavity C.

[0060] In the tire half 17A in the present disclosure, as shown in FIG. 10, it is cooled in a state where the knitted fabric body 36 is pressed against the inner surface 56I of the outer mold 56 in the cavity C. For this reason, the knitted fabric body 36 integrates in a state of being located on the outer side of the tire of the formed resin skeleton 20. More specifically, in the side portion 42 of the resin skeleton 20 (one axial side in the resin skeleton 20), it is preferably integrated in a state of being located on the one axial side rather than at a position 0.5 times the thickness of the side portion 42 of the resin skeleton 20. Also, in the crown portion 16 of the tire 10 (radially outer side in the resin skeleton 20), it is preferably integrated in a state of being located radially outward rather than at a position 0.5 times the thickness of the crown portion 16 of the resin skeleton 20.

[0061] Also, as shown in FIG. 10, the knitted fabric body 36 is pressed against the inner surface 56I of the outer mold 56 within the cavity C, whereby the knitted fabric body 36 is integrated in a state of expanding radially outward of the tire 10 and circumferentially outward of the tire 10. That is, the reinforcing body 40 woven into the knitted fabric body 36 is integrated with the resin skeleton body 20 in a state of expanding in the circumferential direction of the tire 10 of the tire half body 17A.

[0062] Through the above steps, the tire half body 17A according to the present disclosure is manufactured.

[0063] Subsequently, a tire manufacturing method will be described. The tire manufacturing method according to the present disclosure includes an RFID tag placement step, a rubber layer placement step, a joining step, a belt layer placement step, and a tread layer placement step.

[0064] (RFID tag placement step) In the RFID tag placement step, an RFID tag 70 is further placed on the pair of tire half bodies 17A manufactured by the above steps. More specifically, as shown in FIG. 2, the RFID tag 70 is attached via an adhesive layer 90 to a location corresponding to the inner peripheral surface 48I of the inclined portion 48 among the inner peripheral surfaces of the tire half body 17A formed by the above injection step.

[0065] (Rubber layer placement step) In the rubber layer placement step, a rubber layer 24 is placed on one side in the width direction of the pair of tire half bodies 17A manufactured by the above steps.

[0066] (Joining step) In the joining step, in the pair of tire half bodies 17A on which the rubber layer 24 has been placed by the above steps, the ends corresponding to the inner tire equatorial plane in the width direction (on the opposite side to the direction in which the side portion 42 is formed) are joined. As an example of the joining method, the other surfaces of the tire half bodies 17A are welded via a resin material, whereby a tire skeleton member 17 is formed as shown in FIG. 2.

[0067] (Belt layer placement step) In the belt layer arranging step, an annular belt layer 32 is arranged on the radially outer side of the tire 10 of the tire skeleton member 17 manufactured by the joining step. The belt layer 32 can be formed by winding the resin cord member 26 around the crown portion 44 of the tire skeleton member 17.

[0068] (Tread layer arranging step) In the tread layer arranging step, an annular tread layer is arranged on the radially outer side of the tire skeleton member 17 of the tire 10 manufactured by the belt layer arranging step.

[0069] As an example, the radially outer end of the knitted fabric layer 41 extends to the crown portion 16 of the tire skeleton member 17 and overlaps with the belt layer 32. The overlapping amount with the belt layer 32 is preferably 5 mm or more from the end in the width direction of the tire 10 of the belt layer 32 toward the center side in the width direction of the tire 10. Further, the knitted fabric layer 41 may extend to the center in the width direction of the tire 10.

[0070] Through the above steps, the tire 10 of the present embodiment is obtained. In this way, as shown in FIG. 2 and the like, the tire 10 of the present embodiment is arranged on the inner peripheral surface 48I of the inclined portion 48.

[0071] Subsequently, the actions and effects obtained by the tire 10 and the tire manufacturing method in the present disclosure will be described.

[0072] (Actions and effects) In the tire 10 according to the present embodiment, the RFID tag 70 is attached to the inner peripheral surface 48I of the inclined portion 48. Here, for example, when the RFID tag 70 is arranged in a portion different from the inclined portion 48, such as the side portion 14 or the crown portion 44, the RFID tag 70 is likely to come off as the tire 10 deforms during the use of the tire 10 (when the vehicle is running). On the other hand, since the bead portion 12 in the tire 10 according to this aspect is less likely to deform even during the use of the tire 10, the RFID tag 70 is less likely to come off from the inclined portion 48, that is, the inner peripheral surface of the bead portion 12 during the use of the tire 10.

[0073] In addition, since the RFID tag 70 of the tire 10 according to the present embodiment is attached via the adhesive layer 90 in a state of being covered with resin, the RFID tag 70 deforms following the deformation of the resin skeleton 20. Therefore, according to the tire 10 according to this aspect, the RFID tag 70 is less likely to come off from the resin skeleton 20 compared to the case where the RFID tag 70 is attached to the inclined portion 48 without passing through the adhesive layer 90.

[0074] Further, in the tire 10 according to the present embodiment, the RFID tag 70 is attached to the inner surface of the bead portion 12 of the resin skeleton 20 in the tire axial direction. Here, among the tires 10 having the resin skeleton 20, the inner portion of the bead portion 12 in the tire axial direction is less likely to deform than other portions even during use. Therefore, according to the tire manufacturing method according to this aspect, a tire 10 in which the RFID tag 70 is less likely to come off during use can be obtained compared to the case where the RFID tag 70 is attached to a portion other than the bead portion 12 of the resin skeleton 20.

[0075] [First Modified Example] Also, in the above description, the RFID tag 70 was attached to the tire half 17A, that is, the resin skeleton 20, but the tire 10 according to the present embodiment is not limited to this. For example, as shown in FIG. 11, the RFID tag 70 may be attached to the bead portion 12 by being attached to the rubber layer 24 covering the inner peripheral surface 50I of the thick portion.

[0076] Since the bead portion 12 is less likely to deform even during use of the tire 10, also in this modified example, the RFID tag 70 is less likely to come off from the rubber layer 24 during use of the tire 10. Further, in the tire 10 according to this modified example, since the RFID tag 70 is attached to the rubber layer 24 covering the resin skeleton 20, the deformation of the tire 10 is less likely to be transmitted to the RFID tag 70. Therefore, according to the tire 10 according to this aspect, the RFID tag 70 is less likely to come off from the rubber layer 24 covering the inner peripheral surface 50I of the thick portion, that is, the inner peripheral surface of the bead portion 12, even during use of the tire 10 compared to the case where the RFID tag 70 is directly attached to the resin skeleton 20.

[0077] [Second Modification Example] Also, in the above description, the RFID tag 70 was exposed on the radially inner side of the tire 10, but the tire 10 according to this embodiment is not limited to this. For example, as shown in FIG. 12, the RFID tag may be adhered to the inner peripheral surface 50I of the thick portion and attached between the inner peripheral surface 50I of the thick portion and the rubber layer 24. In other words, the RFID tag 70 may be covered by the rubber layer 24 that covers the side portion 14 in the bead portion 12.

[0078] Since the bead portion 12 is difficult to deform even when the tire 10 is in use, in this modification example as well, the RFID tag 70 is difficult to come off from the inner peripheral surface 50I of the thick portion when the tire 10 is in use. Further, in the tire 10 according to this modification example, since the RFID tag 70 is covered by the rubber layer 24 that covers the resin skeleton, the RFID tag 70 is difficult to come off from the inner peripheral surface 50I of the thick portion, that is, the inner peripheral surface of the bead portion 12 even when the tire 10 is in use.

[0079] [Third Modification Example] In the above description, the RFID tag 70 had the resin coating portion 76, but the configuration of the RFID tag 70 in this embodiment is not limited to this. For example, by covering the RFID tag 70 with rubber, the RFID tag 70 covered with rubber may be attached to the resin skeleton 20.

[0080] In the tire 10 according to this modification example, since the RFID tag 70 is attached via the adhesive layer 90 in a state where it is covered with rubber, the RFID tag 70 deforms following the deformation of the resin skeleton 20. Furthermore, in this tire 10, since the RFID tag 70 is covered with rubber, the RFID tag 70 is likely to deform following the deformation of the resin skeleton 20. Therefore, according to the tire 10 according to this aspect, compared with the case where the RFID tag 70 is attached without passing through the adhesive layer 90 and the case where the RFID tag 70 is not covered with rubber, the RFID tag 70 is difficult to come off from the resin skeleton 20 or the rubber layer 24.

[0081] [Other Modification Examples] In the above description, the RFID tag 70 was attached to the inner peripheral surface of the bead portion 12 via the adhesive layer 90. However, the technology according to the present disclosure is not limited to this. For example, the RFID tag 70 may be directly attached by welding the resin coating portion 76 to the resin skeleton body 20 or the rubber layer 24.

[0082] As described above, the embodiments of the present disclosure have been described with reference to the accompanying drawings. However, it is obvious that those having ordinary knowledge in the technical field to which the present disclosure pertains can conceive various modification examples or application examples within the scope of the technical idea described in the claims. Naturally, these are also understood to belong to the technical scope of the present disclosure.

Description of Reference Numerals

[0083] 10 Tire, 12 Bead portion, 14 Side portion, 16 Crown portion, 17 Tire skeleton member, 17A Tire half body, 18 Bead core, 20 Resin skeleton body, 24 Rubber layer, 26 Resin cord member, 30 Tread layer, 32 Belt layer, 34 Primary molded body, 36 Knitted fabric body, 38 First fiber material, 40 Reinforcement, 41 Knitted fabric layer, 42 Side portion, 44 Crown portion, 48 Inclined portion, 50 Thick portion, 52 Inner mold, 52C Peripheral surface, 52S Side surface, 54 Slide mold (an example of a holding mold), 56 Outer mold, 56I Inner surface, 58 Gate portion, C Cavity, 70 RFID tag, 72 Main body chip, 74 Antenna, 76 Resin coating portion, 90 Adhesive layer

Claims

1. A resin framework formed of a thermoplastic resin and having a bead portion, a side portion, and a crown portion, An RFID tag attached to the inner surface in the tire axial direction of the bead portion, A tire comprising the above.

2. The RFID tag is attached to a rubber layer covering the bead portion from the side portion of the resin framework, The tire according to Claim 1.

3. The RFID tag is covered by a rubber layer covering the bead portion from the side portion of the resin framework, The tire according to Claim 1.

4. The RFID tag is coated with resin and attached to the resin framework via an adhesive layer, The tire according to any one of Claims 1 to 3.

5. The RFID tag is coated with rubber and attached to the resin framework via an adhesive layer, The tire according to any one of Claims 1 to 3.

6. A procedure for holding a bead core at the radially inner end of an inner mold using a holding mold, A procedure for forming a cavity using an outer mold facing the wall surface of the inner mold with a gap, A procedure for injecting a resin material into the cavity to form a resin framework having a bead portion, a side portion, and a crown portion, A procedure for attaching an RFID tag in the tire axial direction of the bead portion of the formed resin framework, A tire manufacturing method comprising the above.

Images