Bias tire

Abstract

To provide a bias tire 2, which can suppress deterioration in durability due to the fact that an RFID tag is built in the tire.SOLUTION: A bias tire 2 comprises a pair of beads 10, a carcass 12, a pair of side walls 6, a pair of clinches 8, and a tag member 14 including an RFID tag 32. The carcass 12 is constituted of a plurality of carcass plies 26 including a number of carcass cords 28. In each carcass ply 26, each carcass cord 28 inclines with respect to an equatorial plane. The clinches 8 are hard than the side walls 6. The tag member 14 is positioned between the side walls 6 and the clinches 8. The RFID tag 32 is positioned between an inner end SN of the side wall 6 and an outer end CG of the clinch 8.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] The incorporation of Radio Frequency Identification (RFID) tags into tires is being considered in order to manage data such as tire manufacturing management, customer information, and driving history. There are various types of tires, such as tires for trucks and buses, tires for passenger cars, etc. Patent Document 1 below discloses a safety tire as a passenger car tire with a built-in RFID tag. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-116027 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a bias tire that can suppress a decrease in durability caused by the incorporation of an RFID tag. [Means for solving the problem]

[0005] The bias tire according to the present invention includes a pair of beads, a carcass spanning between the pair of beads, a pair of sidewalls located axially outward of the carcass, a pair of clinches located radially inward of the sidewalls, and a tag member including an RFID tag. The carcass is composed of a plurality of carcass plies including a large number of carcass cords arranged in parallel. In each of the carcass plies, each carcass cord is inclined with respect to the equatorial plane. The clinch is harder than the sidewall. The tag member is located between the sidewall and the clinch. The RFID tag is located between the inner end of the sidewall and the outer end of the clinch. Effect of the Invention

[0006] According to the present invention, a bias tire can be obtained that can suppress a decrease in durability caused by the incorporation of an RFID tag. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a cross-sectional view showing a portion of a bias tire. [Diagram 2] FIG. 2 is a cross-sectional view showing a portion of the tire of FIG. [Diagram 3] FIG. 2 is a schematic diagram illustrating a configuration of a carcass. [Figure 4] FIG. [Diagram 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 2 is a cross-sectional view showing a modified example of the tire in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The tire of the present invention is mounted on a rim. Air is filled inside the tire, and the internal pressure of the tire is adjusted. The tire mounted on the rim is also called a tire-rim assembly. The tire-rim assembly includes a rim and a tire mounted on the rim.

[0009] In the present invention, a state in which a tire is mounted on a standard rim, the internal pressure of the tire is adjusted to a standard internal pressure, and no load is applied to the tire is called a standard state.

[0010] In the present invention, unless otherwise specified, the dimensions and angles of each part of the tire are measured in a normal state. The dimensions and angles of each part in the meridian section of the tire, which cannot be measured when the tire is mounted on a regular rim, are measured on the cut surface of the tire obtained by cutting the tire along a plane including the axis of rotation. In this measurement, the tire is set so that the distance between the left and right beads is the same as the distance between the beads of the tire mounted on a regular rim. The tire configuration that cannot be confirmed when the tire is mounted on a regular rim is confirmed on the aforementioned cut surface.

[0011] A genuine rim is a rim that is specified in the standard on which the tire is based. The "standard rim" in the JATMA standard, the "Design Rim" in the TRA standard, and the "Measuring Rim" in the ETRTO standard are genuine rims.

[0012] Normal tire pressure means the internal pressure specified in the standard on which the tire is based. The "maximum air pressure" in the JATMA standard, the "maximum value" listed in "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" in the TRA standard, and the "INFLATION PRESSURE" in the ETRTO standard are normal tire pressures.

[0013] Normal load refers to the load specified in the standard on which the tire is based. The "maximum load capacity" in the JATMA standard, the "maximum value" listed in "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" in the TRA standard, and the "LOAD CAPACITY" in the ETRTO standard are normal loads.

[0014] In the present invention, the hardness of an element made of crosslinked rubber among the elements constituting a tire is measured using a type A durometer under a temperature condition of 23° C. in accordance with the provisions of JIS K6253.

[0015] In the present invention, the tread portion of a tire is the portion of the tire that comes into contact with the road surface. The bead portion is the portion of the tire that fits onto the rim. The sidewall portion is the portion of the tire that bridges between the tread portion and the bead portion. A tire has the following portions: a tread portion, a pair of bead portions, and a pair of sidewall portions. The portion consisting of the bead portion and the sidewall portion is also called a side portion.

[0016] [Foundations underlying the present invention] The tire carcass includes a number of parallel carcass cords. Each carcass cord spans between a pair of beads. The carcass cords cross the equator plane. Tire carcasses include radial carcasses and bias carcasses. In the radial structure, the crossing angle of the carcass cords is set in the range of 70 to 90 degrees. The carcass cords cross the equatorial plane almost perpendicularly. In the side portions of the tire, the carcass cords extend in the approximate radial direction of the tire. Therefore, for example, even if the carcass is composed of two carcass plies, the carcass cords included in one carcass ply and the carcass cords included in the other carcass ply do not constrain each other. In the radial structure, the side portions are less likely to deform in response to deformation of the tread portion. In contrast, in a bias structure, the carcass cords cross obliquely with respect to the equatorial plane. In the side portion of the tire, the carcass cords are inclined with respect to the radial direction of the tire. Therefore, for example, if a carcass is made up of two carcass plies with carcass cords with different inclination directions, the carcass cords in one carcass ply cross the carcass cords in the other carcass ply, so that the carcass cords of one carcass ply and the carcass cords of the other carcass ply are restrained by each other. The rigidity of the side portion is higher than that of a radial structure. However, if the tread portion deforms, the radially outer portion of the side portion also deforms. In the case of bias-structure tires (hereafter referred to as "bias tires"), deformation is more widespread than in the case of radial-structure tires (hereafter referred to as "radial tires"). Therefore, if RFID tags are placed in the same way as in radial tires, there is a risk that durability will be compromised. Therefore, in order to obtain a bias tire that can suppress the decrease in durability caused by the incorporation of an RFID tag, the inventors took into consideration the characteristics of a carcass with a bias structure and examined the location of the incorporation of the RFID tag, and have completed the invention described below.

[0017] [Overview of the embodiment of the present invention] [Configuration 1] A bias tire according to one embodiment of the present invention comprises a pair of beads, a carcass spanning the pair of beads, a pair of sidewalls located axially outward of the carcass, a pair of clinches located radially inward of the sidewalls, and a tag member including an RFID tag, wherein the carcass is composed of a plurality of carcass plies including a large number of carcass cords arranged in parallel, and in each of the carcass plies, each carcass cord is inclined with respect to the equatorial plane, the clinch is harder than the sidewall, the tag member is located between the sidewall and the clinch, and the RFID tag is located between the inner end of the sidewall and the outer end of the clinch.

[0018] By arranging the bias tires in this way, the decrease in durability caused by incorporating RFID tags is suppressed.

[0019] [Configuration 2] Preferably, in the bias tire according to the above-mentioned [Configuration 1], an outer end of the clinch is adjacent to the carcass and is covered by the sidewall.

[0020] [Configuration 3] Preferably, in the bias tire described in the above-mentioned [Configuration 1] or [Configuration 2], among the plurality of carcass plies, at least two of the carcass plies are wound-up plies that are folded back at each of the beads, each of the wound-up plies has a ply body and a pair of turn-up portions, the ply body spans between the pair of beads, the pair of turn-up portions are each connected to the ply body and folded back at the bead, at least two of the turn-up portions are lined up in the axial direction on the axial outside of each of the beads, and between two adjacent turn-up portions, an end of one of the turn-up portions is located radially outside the end of the other turn-up portion, and of the at least two turn-up portions lined up in the axial direction, an end of one of the turn-up portions is located radially outside the maximum width position of the carcass.

[0021] [Configuration 4] Preferably, in the bias tire described in any one of the above-mentioned [Configuration 1] to [Configuration 3], the carcass comprises a carcass body and a carcass jacket covering the carcass body from the outside, the carcass body includes at least two of the carcass plies, the at least two of the carcass plies being wrap-up plies that are folded back at each of the beads, the carcass jacket includes at least one of the carcass plies, the at least one of the carcass plies being a hanger ply that is not folded back at each of the beads, and the tag member is arranged axially outside the carcass jacket.

[0022] [Configuration 5] Preferably, when the bias tire according to any one of the above-mentioned [Configuration 1] to [Configuration 4] is mounted on a rim, the RFID tag is located radially outward of the radially outer end of the rim.

[0023] [Configuration 6] Preferably, in the bias tire described in any one of the above-mentioned [Configuration 1] to [Configuration 5], the bead comprises a core and an apex located radially outside the core, the apex includes the radial outer end of the bead, the apex tapers toward the radial outer end of the bead, and the RFID tag is located radially outside the radial outer end of the bead.

[0024] [Configuration 7] Preferably, in the bias tire according to any one of the above-mentioned [Configuration 1] to [Configuration 6], an outer end of the clinch is located radially inward of a maximum width position of the carcass.

[0025] [Configuration 8] Preferably, in a state in which the bias tire according to any one of the above-mentioned [Configuration 1] to [Configuration 7] is mounted on a rim, the inner end of the sidewall is located radially outward of the radially outer end of the rim.

[0026] [Configuration 9] Preferably, the bias tire according to any one of the above-mentioned [Configuration 1] to [Configuration 8] is an industrial vehicle tire.

[0027] [Details of the embodiment of the present invention] Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

[0028] 1 shows a part of a bias tire 2 (hereinafter, referred to as tire 2) according to one embodiment of the present invention. This tire 2 is mounted on an industrial vehicle such as a forklift.

[0029] FIG. 1 shows a portion of a cross section of a tire 2 taken along a plane including the rotation axis (not shown) of the tire 2. The cross section shown in FIG. 1 is also called a meridian cross section. The direction indicated by the double arrow AD is the axial direction of the tire 2. The axial direction of the tire 2 means a direction parallel to the rotation axis of the tire 2. The direction indicated by the double arrow RD is the radial direction of the tire 2. The direction perpendicular to the plane of FIG. 1 is the circumferential direction of the tire 2. In FIG. 1, a dashed dotted line CL extending in the radial direction represents the equatorial plane of the tire 2. The cross section shown in Fig. 2 is a part of the meridian cross section shown in Fig. 1. Fig. 2 shows a part of the sidewall portion and the bead portion. In Fig. 2, the solid line BBL extending in the axial direction is the bead base line. The bead base line is a line that defines the rim diameter of the rim R (see JATMA, etc.).

[0030] The tire 2 is mounted on a rim R. The inside of the tire 2 is filled with air, for example, and the internal pressure is adjusted. Although not described in detail, the rim R is a regular rim. Although not shown, a tube is inserted inside the tire 2, and the inside of the tube is filled with air. The tire 2 is a tube type. The tire 2 may be a tubeless type.

[0031] 1, the position indicated by the symbol PC is the intersection point between the outer surface and the equatorial plane of the tire 2. The intersection point PC is also called the equator of the tire 2.

[0032] The tire 2 includes a tread 4, a pair of sidewalls 6, a pair of clinches 8, a pair of beads 10, a carcass 12, and a tag member 14.

[0033] The tread 4 is located radially outward of the carcass 12. The tread 4 extends in the circumferential direction. The tire 2 comes into contact with the road surface at a tread surface 16. The outer surface of the tread 4 includes the tread surface 16 that comes into contact with the road surface. The tread surface 16 includes the equator PC described above. The tread 4 is made of cross-linked rubber. Of the tread 4, a portion including a tread surface 16 is made of cross-linked rubber in consideration of grip performance. The tread 4 is a main element of the tread portion. Although not described in detail, the tread 4 is made of a cross-linked rubber that is generally used as a cross-linked rubber for the tread of a bias tire.

[0034] Although not described in detail, a plurality of lug grooves 18 are formed in the tread 4 of the tire 2. The tread 4 includes a plurality of lug grooves 18. Each of the lug grooves 18 extends from the equatorial plane side toward the outside in the axial direction. The lug grooves 18 are also called lateral grooves. Although not shown, the tread 4 of the tire 2 is formed with two lug groove row 20 in which a plurality of lug grooves 18 are arranged in the circumferential direction. One lug groove row 20 (hereinafter, first lug groove row 20a) is formed in a region on the left side of the equatorial plane. The other lug groove row 20 (hereinafter, second lug groove row 20b) is formed in a region on the right side. The lug grooves 18 of the first lug groove row 20a and the lug grooves 18 of the second lug groove row 20b are arranged alternately in the circumferential direction.

[0035] Each sidewall 6 is continuous with an edge of the tread 4. The sidewall 6 is located radially inward of the tread 4. The sidewall 6 is located axially outward of the carcass 12. The sidewall 6 constitutes the side surface of the tire 2. The sidewall 6 is the main element of the sidewall portion. 2, the position indicated by the symbol SN is the inner end of the sidewall 6. In the sidewall 6 shown in FIG. 2, the inner end SN is included in the side surface. When the tire 2 is mounted on the rim R, the inner end SN of the sidewall 6 is located radially outward of the radially outer end PG of the rim R. The sidewall 6 is made of crosslinked rubber. The sidewall 6 is softer than the tread 4. Although not described in detail, the sidewall 6 is made of crosslinked rubber that is generally used as a crosslinked rubber for the sidewall of a bias tire. The hardness of the sidewall 6 of this tire 2 is 40 or more and 70 or less. A pair of sidewalls 6 are disposed on either side of the equatorial plane. In FIG. 1, the sidewall 6 located on the left side of the equatorial plane, i.e., on one side, is also called the first sidewall 6a. The sidewall 6 located on the right side, i.e., on the other side, is also called the second sidewall 6b. The sidewall 6 located on the right side of the equatorial plane may be called the first sidewall 6a, and the sidewall 6 located on the left side may be called the second sidewall 6b.

[0036] Each clinch 8 is located radially inward of the sidewall 6. The clinches 8, together with the sidewall 6, constitute the side surface of the tire 2. The clinches 8 come into contact with the rim R. The clinches 8 are included in the bead portion. 2, the position indicated by the symbol CG is the outer end of the clinch 8. The outer end CG of the clinch 8 is located radially inside a maximum width position PW of the carcass 12, which will be described later. The clinch 8 is made of cross-linked rubber. The clinch 8 is harder than the sidewall 6. A pair of clinches 8 are disposed on either side of the equatorial plane. In Fig. 1, the clinch 8 located on the left side of the equatorial plane is also called the first clinch 8a. The clinch 8 located on the right side of the equatorial plane is also called the second clinch 8b. The clinch 8 located on the right side of the equatorial plane may be called the first clinch 8a, and the clinch 8 located on the left side may be called the second clinch 8b.

[0037] The clinch 8 is joined to the sidewall 6. The boundary between the sidewall 6 and the clinch 8 connects the inner end SN of the sidewall 6 and the outer end CG of the clinch 8. The sidewall 6 has an end surface 6m (hereinafter also referred to as the sidewall end surface 6m) that is joined to the clinch 8, and the sidewall end surface 6m includes the inner end SN of the sidewall 6. The clinch 8 has an end surface 8m (hereinafter also referred to as the clinch end surface 8m) that is joined to the sidewall 6, and the clinch end surface 8m includes the outer end CG of the clinch 8. The sidewall end surface 6m and the clinch end surface 8m are directly joined to each other, and the boundary between the sidewall 6 and the clinch 8 is formed. In this tire 2, in its meridian cross section, the distance from the inner end SN of the sidewall 6 to the outer end CG of the clinch 8, represented by the length of the line segment connecting between the inner end SN of the sidewall 6 and the outer end CG of the clinch 8, is 10 mm or more and 50 mm or less.

[0038] Each bead 10 is located axially inside the clinch 8. The bead 10 is a main element of the bead portion. The bead 10 includes a core 22 and an apex 24. The core 22 extends in the circumferential direction. Although not shown, the core 22 includes a steel wire. The apex 24 is located radially outward of the core 22. The apex 24 includes a radially outer end PA of the bead 10. The apex 24 tapers toward the radially outer end PA. The apex 24 is made of crosslinked rubber having high rigidity. In this tire 2, the radial outer end PA of the bead 10 is located radially outward of the radial outer end PG of the rim R. The radial outer end PA is located radially outward of the inner end SN of the sidewall 6. The radial outer end PA is located radially inward of the outer end CG of the clinch. A pair of beads 10 are disposed on either side of the equatorial plane. In Fig. 1, the bead 10 located on the left side of the equatorial plane is also called the first bead 10a. The bead 10 located on the right side of the equatorial plane is also called the second bead 10b. The bead 10 located on the right side of the equatorial plane may be called the first bead 10a, and the bead 10 located on the left side of the equatorial plane may be called the second bead 10b.

[0039] The carcass 12 is located inside the tread 4, the pair of sidewalls 6, and the pair of clinches 8. The carcass 12 bridges between the pair of beads 10. The carcass 12 forms the framework of the tire 2. 1, the position indicated by the symbol PW is the axially outer end of the carcass 12. The axially outer end PW is also called the maximum width position of the carcass 12 (hereinafter, the carcass maximum width position).

[0040] The carcass maximum width position PW is determined in the tire 2 in a normal state. If the carcass maximum width position PW cannot be determined when the tire 2 is mounted on the rim R, the carcass maximum width position PW is determined on a cut surface of the tire 2 obtained by cutting the tire 2 along a plane including the rotation axis. In this determination, the tire 2 is set so that the distance between the left and right beads 10 matches the distance between the beads 10 in the tire 2 mounted on the rim R.

[0041] The carcass 12 of the tire 2 is composed of a plurality of carcass plies 26. The carcass 12 shown in FIG.

[0042] Fig. 3 shows the configuration of the carcass 12. The direction indicated by the double arrow AD is the axial direction of the tire 2. The direction indicated by the double arrow CD is the circumferential direction of the tire 2. The direction perpendicular to the paper surface of Fig. 3 is the radial direction of the tire 2. The configuration of the carcass 12 shown in Fig. 3 is the configuration of the carcass 12 on the radially inner side of the tread 4.

[0043] 3, each carcass ply 26 includes a number of parallel carcass cords 28. For ease of explanation, the carcass cords 28 are represented by solid lines, but in the carcass ply 26, the carcass cords 28 are covered with a topping rubber 30. In each carcass ply 26, the carcass cords 28 do not intersect perpendicularly to the equatorial plane, but intersect obliquely with respect to the equatorial plane. The carcass cords 28 are inclined with respect to the equatorial plane. The carcass 12 has a bias structure. The carcass 12 is a carcass with a bias structure.

[0044] 3, between two radially adjacent carcass plies 26, the inclination direction of the carcass cord 28 included in one carcass ply 26 is opposite to the inclination direction of the carcass cord 28 included in the other carcass ply 26. The carcass cord 28 included in one carcass ply 26 intersects with the carcass cord 28 included in the other carcass ply 26.

[0045] The tag member 14 is located between the sidewall 6 and the clinch 8. The tag member 14 is sandwiched between an end face 6m of the sidewall 6 and an end face 8m of the clinch 8. In other words, the tag member 14 is located at the boundary between the sidewall 6 and the clinch 8. In this tire 2, one tag member 14 is provided only on the second sidewall 6b side. The tag member 14 may be provided only on the first sidewall 6a side. The tag member 14 may be provided on both the first sidewall 6a side and the second sidewall 6b side. From the viewpoint of reducing the risk of damage, it is preferable that the tag member 14 is provided only on the side of either the first sidewall 6a or the second sidewall 6b, that is, on the side of only one of the pair of sidewalls 6. Although multiple tag members 14 may be provided at intervals in the circumferential direction, from the viewpoint of reducing the risk of damage, it is sufficient that one tag member 14 is provided on the side of one of the sidewalls 6.

[0046] Fig. 4 is a plan view of the tag member 14. Fig. 5 is a cross-sectional view taken along line VV in Fig. 4. The tag member 14 is plate-shaped. The tag member 14 is long in the length direction and short in the width direction. As shown in FIG. 1, in the tire 2, the tag member 14 is disposed such that one end in the width direction (hereinafter, the first end 14s) is located on the radially outer side of the tire 2, and the other end (hereinafter, the second end 14u) is located on the inner side. In the tire 2, the first end 14s is also called the outer end, and the second end 14u is also called the inner end. The second end 14u may be disposed on the radially outer side, and the first end 14s may be disposed on the radially inner side. In this case, in the tire 2, the second end 14u is also called the outer end, and the first end 14s is also called the inner end.

[0047] The tag member 14 includes an RFID tag 32. In FIG. 4, the RFID tag 32 is shown by a solid line for ease of explanation, and is entirely covered with a protective body 34. The tag member 14 includes an RFID tag 32 and a protective body 34. The RFID tag 32 is located at the center of the tag member 14. The protective body 34 is made of crosslinked rubber. The protective body 34 has approximately the same rigidity as the sidewall 6. In this tire 2, the formation of a good communication environment is taken into consideration, and a crosslinked rubber having high electrical resistance is used for the protective body 34. The protective body 34 is made of rubber with high insulating properties.

[0048] Although not described in detail, the RFID tag 32 is a small and lightweight electronic component consisting of a semiconductor chip 36 that integrates a transmitting / receiving circuit, a control circuit, a memory, etc., and an antenna 38. When the RFID tag 32 receives an interrogation radio wave, it uses the received signal as electrical energy and transmits the various data stored in the memory as a response radio wave. This RFID tag 32 is a type of passive radio frequency identification transponder. In the RFID tag 32, the antenna 38 extends from the semiconductor chip 36 in the length direction of the RFID tag 32. As shown in Fig. 4, the RFID tag 32 includes a pair of antennas 38 extending in the length direction thereof, and the semiconductor chip 36 located between the pair of antennas 38. The RFID tag 32 is disposed in the tag member 14 such that the length direction of the RFID tag 32 coincides with the length direction of the tag member 14.

[0049] The tag member 14 is a plate-shaped member in which the RFID tag 32 is covered with crosslinked rubber. From the viewpoints of reducing the risk of damage to the RFID tag 32 and forming a good communication environment, the thickness of the tag member 14 in the meridian cross section of the tire 2 is preferably 1.0 mm or more and 2.5 mm or less. The thickness of the tag member 14 in the tire 2 is represented by the maximum thickness of the tag member 14 in the semiconductor chip 36 of the RFID tag 32. The length TL of the tag member 14 before being embedded in the tire 2 is 60 mm or more and 80 mm or less, and the width TW is 10 mm or more and 20 mm or less.

[0050] 2, the position indicated by the symbol TU is the radially inner end of the RFID tag 32 (specifically, the semiconductor chip 36). The position indicated by the symbol TS is the radially outer end of the semiconductor chip 36, i.e., the radially outer end of the RFID tag 32. In the present invention, when the inner end TU of the RFID tag 32 in the tire 2 is located radially outward from a reference position (hereinafter, the reference position), the RFID tag 32 is located radially outward from the reference position. When the outer end TS of the RFID tag 32 in the tire 2 is located radially inward from the reference position, the RFID tag 32 is located radially inward from the reference position.

[0051] As described above, the carcass 12 of the tire 2 has a bias structure. The rigidity of the side portion is higher than that of a radial structure. However, if the tread portion deforms, the radially outer portion of the side portion also deforms. Depending on the position where the RFID tag 32 is arranged, durability may be impaired. In this tire 2, a hard clinch 8 is provided between the carcass 12 and the sidewall 6. The clinch 8, together with the carcass 12, suppresses bending of the side portion, so that the tire 2 can improve resistance to external damage. In tires with a bias-structured carcass, the sidewalls also deform in response to deformation of the tread. For this reason, when placing an RFID tag, it is considered to place the RFID tag away from the tread. In tires, the bead portion is away from the tread and has high rigidity. In this tire 2, a hard clinch 8 is used in the bead portion in order to increase the rigidity of the side portion and improve resistance to external damage. Since a bias-structured carcass is used for the carcass 12, shear strain is more likely to occur between the carcass 12 and the clinch 8 in this tire 2 than in a tire that uses a radial-structured carcass. If the carcass has a radial structure, an RFID tag can be placed between the carcass and the clinch, but in the case of this tire 2, if the RFID tag 32 is placed between the carcass 12 and the clinch 8, there is a risk that the RFID tag 32 itself will be damaged or that damage will originate from the RFID tag 32.

[0052] The tag member 14 of this tire 2 is located between the sidewall 6 and the clinch 8, not between the carcass 12 and the clinch 8. The RFID tag 32 is located between the inner end SN of the sidewall 6 and the outer end CG of the clinch 8. Since the sidewall 6 is softer than the clinch 8, the shear strain generated between the sidewall 6 and the clinch 8 is smaller than the shear strain generated between the carcass 12 and the clinch 8. In this tire 2, the risk of damage to the RFID tag 32 itself and the risk of damage originating from the RFID tag 32 are reduced. Moreover, since the RFID tag 32 is disposed away from the tread portion, it is less susceptible to the deformation of the tread portion. In this tire 2, the decrease in durability due to the incorporation of the RFID tag 32 can be suppressed.

[0053] As described above, the clinch 8 is harder than the sidewall 6. From the viewpoint that the clinch 8 can contribute to improving the resistance to external damage, the difference in hardness between the clinch 8 and the sidewall 6 is preferably 10 or more, and more preferably 13 or more. From the viewpoint that the rigidity difference between the sidewall 6 and the clinch 8 is appropriately maintained and the occurrence of shear strain is suppressed, the difference in hardness between the clinch 8 and the sidewall 6 is preferably 20 or less, and more preferably 17 or less.

[0054] The tag member 14 of the tire 2 is disposed between the sidewall 6 and the clinch 8 . Although not shown, when the inner end SN of the sidewall 6 is adjacent to the carcass 12 and covered with the clinch 8, the inner end SN of the sidewall 6 is sandwiched between the carcass 12 and the clinch 8. In this case, the sidewall 6 is present between the boundary between the sidewall 6 and the clinch 8 and the carcass 12. Since the sidewall is soft, when the carcass 12 deforms, the sidewall 6 also deforms in accordance with the deformation. Therefore, there is a concern that the occurrence of shear strain between the sidewall 6 and the clinch 8 cannot be sufficiently suppressed. In contrast, for example, as shown in FIG. 2, when the outer end CG of the clinch 8 is adjacent to the carcass 12 and covered by the sidewall 6, the outer end CG of the clinch 8 is sandwiched between the carcass 12 and the sidewall 6. In this case, the clinch 8 exists between the boundary between the sidewall 6 and the clinch 8 and the carcass 12. Since the clinch 8 is hard, even if the carcass 12 is deformed, the effect of the deformation on the sidewall 6 located directly outside the clinch 8 is small. Therefore, the occurrence of shear strain between the sidewall 6 and the clinch 8 is sufficiently suppressed. In this tire 2, the risk of damage to the RFID tag 32 itself arranged between the sidewall 6 and the clinch 8 and the risk of damage originating from the RFID tag 32 are reduced. In this tire 2, the deterioration of durability due to the incorporation of the RFID tag 32 can be suppressed. From this viewpoint, it is preferable that the outer end CG of the clinch 8 is adjacent to the carcass 12 and covered by the sidewall 6.

[0055] As described above, the carcass 12 is composed of a plurality of carcass plies. The carcass 12 of the tire 2 can include two different types of carcass plies 26. The first type of carcass ply 26 is a type of carcass ply 26 that is turned up at each bead 10. The carcass ply 26 that is turned up at each bead 10 is also called a turn-up ply. The second type of carcass ply 26 is a type of carcass ply 26 that is not turned up at each bead 10. The carcass ply 26 that is not turned up at each bead 10 is also called a hanger ply.

[0056] In the present invention, the turnup ply means the carcass ply 26 that is turned up at each bead 10 so that the ends of the carcass ply 26 are located radially outside the core 22 of the bead 10. If the ends of the carcass ply 26 are not located radially outside the core 22 as a result of turning up the carcass ply 26 at the bead 10, then the carcass ply 26 is not a turnup ply but a hanger ply.

[0057] As described above, the carcass 12 of the tire 2 is composed of six carcass plies 26. Of the six carcass plies 26, four carcass plies 26 located on the inner side are turned up at each bead 10. The four carcass plies 26 located on the inner side are turn-up plies 40.

[0058] Each of the four wound-up plies 40 is folded back at each bead 10. Each wound-up ply 40 includes a ply body 40m and a pair of turned-up portions 40t. The ply body 40m spans between the pair of beads 10. Each of the pair of turned-up portions 40t is connected to the ply body 40m and turned back at the bead 10. The turned-up portions 40t of this tire 2 are turned back at the bead 10 from the inside toward the outside in the axial direction.

[0059] On the axially outer side of the bead 10, the turn-up portions 40t of the respective turn-up plies 40 are aligned in the axial direction. Since the carcass 12 of the tire 2 includes four turn-up plies 40, the four turn-up portions 40t are aligned in the axial direction. In the tire 2, the turn-up portion 40t located on the outermost side in the axial direction is the first turn-up portion 40t1. The turn-up portion 40t located on the axially inner side of the first turn-up portion 40t1 is the second turn-up portion 40t2. The turn-up portion 40t located on the axially inner side of the second turn-up portion 40t2 is the third turn-up portion 40t3. The turn-up portion 40t located on the axially inner side of the third turn-up portion 40t3 is the fourth turn-up portion 40t4. In the tire 2, the fourth turn-up portion 40t4 is the turn-up portion 40t located on the axially innermost side of the four turn-up portions 40t.

[0060] The roll-up ply 40 including the first turn-up portions 40t1 is also called a first roll-up ply 40a, and the ply body 40m of the first roll-up ply 40a is also called a first ply body 40m1. The first roll-up ply 40a includes a first ply body 40m1 and a pair of first turn-up portions 40t1.

[0061] The roll-up ply 40 including the second turned-up portions 40t2 is also called a second roll-up ply 40b, and the ply body 40m of the second roll-up ply 40b is also called a second ply body 40m2. The second roll-up ply 40b includes a second ply body 40m2 and a pair of second turned-up portions 40t2.

[0062] The roll-up ply 40 including the third turned-up portion 40t3 is also called a third roll-up ply 40c, and the ply body 40m of the third roll-up ply 40c is also called a third ply body 40m3. The third roll-up ply 40c includes a third ply body 40m3 and a pair of third turned-up portions 40t3.

[0063] The roll-up ply 40 including the fourth turned-up portion 40t4 is also called a fourth roll-up ply 40d, and the ply body 40m of the fourth roll-up ply 40d is also called a fourth ply body 40m4. The fourth roll-up ply 40d includes a fourth ply body 40m4 and a pair of fourth turned-up portions 40t4.

[0064] In this tire 2, of the four ply bodies 40m included in the carcass 12, a first ply body 40m1 is positioned on the inner surface side of the tire 2, and a fourth ply body 40m4 is positioned on the outer surface side of the tire 2.

[0065] In the tire 2, the portion of the carcass 12 that is configured with the turnup ply 40 is also called the carcass body 44. As described above, among the six carcass plies 26, the four carcass plies 26 located on the inner side are the turnup plies 40. The carcass body 44 of the tire 2 includes four turnup plies 40. The carcass body 44 may be configured with at least two turnup plies 40, and may be configured with three turnup plies 40, or may be configured with five or more turnup plies 40. That is, the carcass 12 of the tire 2 can include the carcass body 44. The carcass body 44 can include at least two carcass plies 26. In this case, the at least two carcass plies 26 included in the carcass body 44 are the turnup plies 40 that are folded up at each bead 10. The carcass 12 of the tire 2 may include at least two winding plies 40 .

[0066] In the tire 2, of the six carcass plies 26 constituting the carcass 12, the two carcass plies 26 located on the outer side are not turned up at each bead 10. The two carcass plies 26 located on the outer side are hanger plies 42.

[0067] Each of the two hanger plies 42 is not folded back at the bead 10. Each hanger ply 42 extends from the equatorial plane toward the corresponding bead 10. An end 42e of each hanger ply 42 is located radially inward of the bead 10.

[0068] The carcass 12 of the tire 2 includes two hanger plies 42. Of the two hanger plies 42, the hanger ply 42 laminated on the outer side of the carcass body 44 is a first hanger ply 42a. The hanger ply 42 laminated on the outer side of the first hanger ply 42a is a second hanger ply 42b.

[0069] In the tire 2, the portion of the carcass 12 that is configured by the hanger ply 42 is also called the carcass jacket 46. As described above, in the carcass 12 of the tire 2, the first hanger ply 42a is laminated on the outside of the carcass body 44, and the second hanger ply 42b is laminated further outside the first hanger ply 42a. The carcass jacket 46 covers the carcass body 44 from the outside. As described above, of the six carcass plies 26, the two carcass plies 26 located on the outer side are the hanger plies 42. The carcass jacket 46 of the tire 2 includes two hanger plies 42. The carcass jacket 46 may be composed of at least one hanger ply 42, and may be composed of three or more hanger plies 42. That is, the carcass 12 of the tire 2 can include the carcass body 44 described above and the carcass jacket 46 that covers the carcass body 44 from the outside. The carcass jacket 46 can include at least one carcass ply 26. In this case, the at least one carcass ply 26 included in the carcass jacket 46 is the hanger ply 42 that is not folded back at each bead 10. The carcass 12 of the tire 2 may include at least two turnup plies 40 and at least one hanger ply 42 .

[0070] As described above, the carcass 12 of the tire 2 includes the carcass body 44 and the carcass jacket 46. In the tire 2, the carcass 12 may be composed of only the carcass body 44. In this case, the carcass 12 does not include the hanger ply 42 and is composed of a plurality of wrap-up plies 40. The carcass 12 of the tire 2 may be composed of two wrap-up plies 40.

[0071] As described above, the carcass 12 of the tire 2 is composed of six carcass plies 26. The six carcass plies 26 are arranged in the thickness direction of the tire 2. Of the six carcass plies 26, the carcass ply 26 closest to the inner surface of the tire 2, that is, the carcass ply 26 located on the innermost side among the multiple carcass plies 26 constituting the carcass 12 of the tire 2, is the first carcass ply 26a. The carcass ply 26 closest to the inner surface of the tire 2 next to the first carcass ply 26a is the second carcass ply 26b. The carcass ply 26 closest to the inner surface of the tire 2 next to the second carcass ply 26b is the third carcass ply 26c. The carcass ply 26 closest to the inner surface of the tire 2 next to the third carcass ply 26c is the fourth carcass ply 26d. The carcass ply 26 closest to the inner surface of the tire 2 next to the fourth carcass ply 26d is the fifth carcass ply 26e. The sixth carcass ply 26f is the carcass ply 26 next closest to the inner surface of the tire 2 after the fifth carcass ply 26e. Since the carcass 12 of this tire 2 is composed of six carcass plies 26, the sixth carcass ply 26f is the carcass ply 26 located outermost among the multiple carcass plies 26 that constitute the carcass 12. The fifth carcass ply 26e located on the inner side of the sixth carcass ply 26f is the carcass ply 26 located on the inner side of the outermost carcass ply 26 among the multiple carcass plies 26 that constitute the carcass 12.

[0072] The carcass 12 of the tire 2 includes four turnup plies 40 constituting a carcass body 44 and two hanger plies 42 constituting a carcass jacket 46. The first turnup ply 40a is the first carcass ply 26a, the second turnup ply 40b is the second carcass ply 26b, the third turnup ply 40c is the third carcass ply 26c, the fourth turnup ply 40d is the fourth carcass ply 26d, the first hanger ply 42a is the fifth carcass ply 26e, and the second hanger ply 42b is the sixth carcass ply 26f.

[0073] In Fig. 3, the angle indicated by the symbol α1 is the angle that the carcass cord 28 included in the first winding ply 40a makes with respect to the equatorial plane. The angle indicated by the symbol α2 is the angle that the carcass cord 28 included in the second winding ply 40b makes with respect to the equatorial plane. The angle indicated by the symbol α3 is the angle that the carcass cord 28 included in the third winding ply 40c makes with respect to the equatorial plane. The angle indicated by the symbol α4 is the angle that the carcass cord 28 included in the fourth winding ply 40d makes with respect to the equatorial plane. 3, an angle indicated by the symbol β1 is an angle that the carcass cord 28 included in the first hanger ply 42a makes with respect to the equatorial plane, and an angle indicated by the symbol β2 is an angle that the carcass cord 28 included in the second hanger ply 42b makes with respect to the equatorial plane.

[0074] As described above, the carcass 12 of the tire 2 has a bias structure. The angle α1 that the carcass cords 28 included in the first winding ply 40a make with respect to the equatorial plane, i.e., the inclination angle α1 of the carcass cords 28 included in the first winding ply 40a, is preferably 25 degrees or more and 45 degrees or less. The inclination angle α2 of the carcass cords 28 included in the second winding ply 40b is preferably 25 degrees or more and 45 degrees or less. The inclination angle α3 of the carcass cords 28 included in the third winding ply 40c is preferably 25 degrees or more and 45 degrees or less. The inclination angle α4 of the carcass cords 28 included in the fourth winding ply 40d is preferably 25 degrees or more and 45 degrees or less. The inclination angle β1 of the carcass cord 28 included in the first hanger ply 42a is preferably 25 degrees or more and 45 degrees or less. The inclination angle β2 of the carcass cord 28 included in the second hanger ply 42b is preferably 25 degrees or more and 45 degrees or less.

[0075] 2, the end 40t3e of the third turned-up portion 40t3 is located radially outward of the end 40t4e of the fourth turned-up portion 40t4 located adjacent to the third turned-up portion 40t3. In the tire 2, the end 40t4e of the fourth turned-up portion 40t4 may be disposed radially outward of the end 40t3e of the third turned-up portion 40t3. In the carcass 12, the end 40t2e of the second turned-up portion 40t2 is located radially outward of the end 40t3e of the third turned-up portion 40t3 located adjacent to the second turned-up portion 40t2. In the tire 2, the end 40t3e of the third turned-up portion 40t3 may be disposed radially outward of the end 40t2e of the second turned-up portion 40t2. In the carcass 12, the end 40t1e of the first turned-up portion 40t1 is located radially outward of the end 40t2e of the second turned-up portion 40t2 located adjacent to the first turned-up portion 40t1. In the tire 2, the end 40t2e of the second turned-up portion 40t2 may be disposed radially outward of the end 40t1e of the first turned-up portion 40t1. As described above, the carcass 12 can include at least two turnup plies 40. In the tire 2, at least two turned-up portions 40t are arranged in the axial direction on the axially outer side of the bead 10, and between two adjacent turned-up portions 40t, an end 40te of one turned-up portion 40t is located radially outward of an end 40te of the other turned-up portion 40t.

[0076] In this tire 2, between two adjacent folded-back portions 40t, the radial position of the end 40te of one folded-back portion 40t is prevented from coinciding with the radial position of the end 40te of the other folded-back portion 40t. In other words, between two adjacent folded-back portions 40t, the end 40te of one folded-back portion 40t does not overlap with the end 40te of the other folded-back portion 40t in the axial direction. In this tire 2, the concentration of strain caused by the end 40te of one folded-back portion 40t overlapping with the end 40te of the other folded-back portion 40t is suppressed. From this viewpoint, it is preferable that at least two folded-back portions 40t are arranged in the axial direction on the axial outside of the bead 10, and that between two adjacent folded-back portions 40t, the end 40te of one folded-back portion 40t is located radially outside the end 40te of the other folded-back portion 40t.

[0077] In the present invention, the end 40te of one folded portion 40t and the end 40te of the other folded portion 40t do not overlap in the axial direction means that the radial height of one folded portion 40t, represented by the radial distance from the bead baseline to the end 40te of one folded portion 40t, and the radial height of the other folded portion 40t, represented by the radial distance from the bead baseline to the end 40te of the other folded portion 40t, are different.

[0078] In the tire 2, among the multiple folded-back portions 40t arranged in the axial direction, the end 40t1e of the first folded-back portion 40t1 is located radially outermost. Between two adjacent folded-back portions 40t, as long as the end 40te of one folded-back portion 40t is located radially outer than the end 40te of the other folded-back portion 40t, the end 40t2e of the second folded-back portion 40t2 may be located radially outermost. The end 40t3e of the third folded-back portion 40t3 may be located radially outermost. The end 40t4e of the fourth folded-back portion 40t4 may be located radially outermost.

[0079] As shown in FIG. 2, the radial position of the end 40t1e of the first folded portion 40t1 does not match the radial position of the end 40te of the other folded portions 40t. The radial position of the end 40t2e of the second folded portion 40t2 does not match the radial position of the end 40te of the other folded portions 40t. The radial position of the end 40t3e of the third folded portion 40t3 does not match the radial position of the end 40te of the other folded portions 40t. The radial position of the end 40t4e of the fourth folded portion 40t4 does not match the radial position of the end 40te of the other folded portions 40t. In this tire 2, the ends 40te of the multiple folded portions 40t aligned in the axial direction on the axial outer side of the bead 10 are distributed in the radial direction. In this tire 2, the concentration of strain on the ends 40te of the folded portions 40t is effectively suppressed. In the tire 2, the folded-back portion 40t can effectively reinforce the bead portion while suppressing concentration of strain at the end 40te of the folded-back portion 40t. The tire 2 can increase rigidity while ensuring durability. From this viewpoint, it is preferable that the ends 40te of the multiple folded-back portions 40t arranged in the axial direction on the axially outer side of the bead 10 are dispersedly disposed in the radial direction. In this case, it is more preferable that, between two adjacent folded-back portions 40t, the radial distance from the end 40te of one folded-back portion 40t to the end 40te of the other folded-back portion 40t is 10 mm or more and 50 mm or less.

[0080] In this tire 2, the end 40t4e of the fourth turned-up portion 40t4 is located radially inside the radial outer end PG of the rim R, while the end 40t3e of the third turned-up portion 40t3 is located radially outside the radial outer end PG of the rim R. The end 40t2e of the second turned-up portion 40t2 is located radially outside the end 40t3e of the third turned-up portion 40t3. In this tire 2, among the ends 40te of the multiple turned-up portions 40t located radially outside the radial outer end PG of the rim R, the end 40t3e of the third turned-up portion 40t3 is the end 40te of the turned-up portion 40t closest to the radial outer end PG of the rim R. The end 40t2e of the second turned-up portion 40t2 is the end 40te of the turned-up portion 40t next closest to the radial outer end PG of the rim R after the end 40t3e of the third turned-up portion 40t3.

[0081] 2, the inner end SN of the sidewall 6 is located radially inside the end 40t3e of the third folded portion 40t3. The outer end CG of the clinch 8 is located radially outside the end 40t2e of the second folded portion 40t2. The end 40t3e of the third folded portion 40t3 and the end 40t2e of the second folded portion 40t2 are located between the inner end SN of the sidewall 6 and the outer end CG of the clinch 8 in the radial direction. In the tire 2, the RFID tag 32 may be located between the inner end SN of the sidewall 6 and the end 40t3e of the third folded-back portion 40t3 in the radial direction, as long as the RFID tag 32 does not overlap with the end 40te of the folded-back portion 40t in the axial direction. The RFID tag 32 may be located between the end 40t3e of the third folded-back portion 40t3 and the end 40t2e of the second folded-back portion 40t2 in the radial direction. The RFID tag 32 may be located between the end 40t2e of the second folded-back portion 40t2 and the outer end CG of the clinch 8 in the radial direction. From the viewpoint of minimizing the influence of shear strain occurring between the sidewall 6 and the clinch 8, the RFID tag 32 is preferably located between the end 40t3e of the third folded portion 40t3 and the end 40t2e of the second folded portion 40t2 in the radial direction, as shown in Fig. 2. In other words, the RFID tag 32 is preferably located between the end 40te of the folded portion 40t closest to the radial outer end PG of the rim R and the end 40te of the folded portion 40t next closest to the radial outer end PG of the rim R, among the ends 40te of the folded portion 40t located radially outside the radial outer end PG of the rim R.

[0082] However, when the RFID tag 32 approaches the rim R, there is a risk that radio wave disturbances will occur and a good communication environment will not be established between the RFID tag 32 and a communication device (not shown). From the viewpoint of suppressing radio wave disturbances and creating a good communication environment, it is preferable that the RFID tag 32 be located radially outside the radial outer end PG of the rim R when the tire 2 is mounted on the rim R. As described above, the radially outer end PA of the bead 10 is located radially outside the radially outer end PG of the rim R. From the viewpoint of being able to keep the RFID tag 32 away from the rim R and effectively forming a good communication environment, it is more preferable that the RFID tag 32 be located radially outside the radially outer end PA of the bead 10. As shown in FIG. 2, in the tire 2, the radially outer end PA of the bead 10 is located radially inside the end 40t3e of the third folded-up portion 40t3.

[0083] 2, the third turned-up portion 40t3 is located axially outward of the fourth turned-up portion 40t4. An end 40t3e of the third turned-up portion 40t3 located axially outward of the fourth turned-up portion 40t4 is located radially outward of an end 40t4e of the fourth turned-up portion 40t4. Furthermore, the second turned-up portion 40t2 is located axially outward of the third turned-up portion 40t3. An end 40t2e of the second turned-up portion 40t2 located axially outward of the third turned-up portion 40t3 is located radially outward of an end 40t3e of the third turned-up portion 40t3. The first turned-up portion 40t1 is located axially outward of the second turned-up portion 40t2. An end 40t1e of the first turned-up portion 40t1 located axially outward of the second turned-up portion 40t2 is located radially outward of an end 40t2e of the second turned-up portion 40t2.

[0084] In this tire 2, among the multiple folded-back portions 40t arranged in the axial direction on the axial outside of the bead 10, between two adjacent folded-back portions 40t, the end 40te of the folded-back portion 40t located on the axial outside is located radially outside the end 40te of the folded-back portion 40t located on the axial inside. The end 40te of the folded-back portion 40t located on the axial inside is covered by the folded-back portion 40t located on the axial outside. Therefore, the folded-back portion 40t located on the outer side can effectively reinforce the bead portion while suppressing the concentration of strain on the end 40te of the folded-back portion 40t located on the inner side. This tire 2 can increase rigidity while ensuring durability. From this viewpoint, it is preferable that, among the multiple folded-back portions 40t arranged in the axial direction on the axial outside of the bead 10, between two adjacent folded-back portions 40t, the end 40te of the folded-back portion 40t located on the axial outside is located radially outside the end 40te of the folded-back portion 40t located on the axial inside.

[0085] The tag member 14 of this tire 2 is disposed on the outer side of a sixth carcass ply 26f that is located on the outermost side among the multiple carcass plies 26 that constitute the carcass 12. As described above, the carcass ply 26 includes the carcass cord 28. In the tire 2, the carcass cord 28 included in the sixth carcass ply 26f is not a steel cord but is a cord made of organic fiber. In the tire 2, the occurrence of radio wave disturbance is suppressed, and a good communication environment is formed. As described above, the tire 2 can suppress the decrease in durability caused by the incorporation of an RFID tag. Therefore, the tire 2 can suppress the decrease in durability caused by the incorporation of an RFID tag, and can communicate well with the incorporation of the RFID tag. From this viewpoint, the carcass cord 28 of the carcass ply 26f located on the outermost side among the multiple carcass plies 26 constituting the carcass 12 is preferably a cord made of organic fiber. From the same viewpoint, it is more preferable that the carcass cord 28 included in the remaining five carcass plies 26 is also a cord made of organic fiber. In other words, it is more preferable that the carcass cord 28 included in all the carcass plies 26 constituting the carcass 12 is a cord made of organic fiber. Examples of the organic fiber include nylon fiber, rayon fiber, polyester fiber, and aramid fiber. As the carcass cord 28, among cords made of organic fibers, cords made of nylon fibers are preferably used.

[0086] As described above, the carcass 12 of the tire 2 includes the carcass jacket 46 that covers the carcass body 44 from the outside. The carcass jacket 46 is composed of the hanger ply 42 that is not folded back at each bead 10. The carcass jacket 46 does not include a folded-back portion itself. The carcass jacket 46 covers the end 40te of the folded-back portion 40t included in the carcass body 44. The carcass jacket 46 suppresses the concentration of strain on the end 40te of the folded-back portion 40t. Moreover, in the tire 2, the tag member 14 is disposed axially outside the carcass jacket 46 that does not include a folded-back portion. The carcass jacket 46 is interposed between the tag member 14 and the carcass body 44. The RFID tag 32 included in the tag member 14 is disposed away from the end 40te of the folded-back portion 40t. Since the RFID tag 32 and the end 40te of the folded-back portion 40t are prevented from interfering with each other, the concentration of strain on the RFID tag 32 is suppressed. The tire 2 can suppress a decrease in durability due to the incorporation of the RFID tag 32. From this viewpoint, the carcass 12 of the tire 2 preferably includes a carcass body 44 and a carcass jacket 46 that covers the carcass body 44 from the outside.

[0087] The carcass jacket 46 forms the outer side of the carcass 12. When the tire 2 flexes, the tension of the carcass cords 28 included in the hanger ply 42 increases. As described above, in the tire 2, the end 42e of the hanger ply 42 constituting the carcass jacket 46 is located on the radially inner side of the bead 10. Therefore, for example, as shown in FIG. 2, when the tire 2 is assembled to the rim R, the end 42e of the hanger ply 42 is sandwiched between the core 22 of the bead 10 and the rim R. The core 22 tightens the rim R. This restrains the end 42e of the hanger ply 42. Therefore, when the tire 2 is bent, the tension of the carcass cord 28 included in the hanger ply 42 is effectively increased. Since the rigidity of the side portion is increased, distortion is less likely to concentrate on the RFID tag 32 arranged on the radially inner side of the maximum width position PW of the carcass 12. In the tire 2, the decrease in durability due to the incorporation of the RFID tag 32 can be suppressed. From this viewpoint, it is preferable that the end 42e of the hanger ply 42 is located on the radially inner side of the bead 10.

[0088] 6 shows a part of a bias tire 52 (hereinafter, tire 52) according to another embodiment of the present invention. This tire 52 is also mounted on an industrial vehicle such as a forklift.

[0089] Fig. 6 shows a part of a meridian cross section of a tire 52. Like Fig. 2, Fig. 6 shows a part of a sidewall portion and a bead portion.

[0090] This tire 52 has the same elements as the tire 2 shown in Fig. 1. The same elements as the elements of the tire 2 shown in Fig. 1 are assigned the same reference numerals as the reference numerals of the elements of the tire 2 shown in Fig. 1. Below, configurations that differ from the configuration of the tire 2 shown in Fig. 1 will be described, and descriptions of the same configurations will be omitted.

[0091] In the tire 52, the carcass body 44 of the carcass 12 also includes four roll-up plies 40. The first roll-up ply 40a includes a first ply body 40m1 and a pair of first turn-up portions 40t1. The second roll-up ply 40b includes a second ply body 40m2 and a pair of second turn-up portions 40t2. The third roll-up ply 40c includes a third ply body 40m3 and a pair of third turn-up portions 40t3. The fourth roll-up ply 40d includes a fourth ply body 40m4 and a pair of fourth turn-up portions 40t4. On the axially outer side of the bead 10, the turn-up portions 40t of the respective turn-up plies 40 are aligned in the axial direction. Since the carcass 12 of this tire 52 also includes four turn-up plies 40, the four turn-up portions 40t are aligned in the axial direction. The turn-up portion 40t located on the outermost side in the axial direction is the first turn-up portion 40t1. The turn-up portion 40t located on the innermost side in the axial direction is the fourth turn-up portion 40t4.

[0092] The third turned portion 40t3 is located axially outward of the fourth turned portion 40t4. An end 40t3e of the third turned portion 40t3 is located radially outward of an end 40t4e of the fourth turned portion 40t4. The second turned-up portion 40t2 is located axially outward of the third turned-up portion 40t3. An end 40t2e of the second turned-up portion 40t2 is located radially outward of an end 40t3e of the third turned-up portion 40t3. The first turned-up portion 40t1 is located axially outward of the second turned-up portion 40t2. An end 40t1e of the first turned-up portion 40t1 is located radially outward of an end 40t2e of the second turned-up portion 40t2.

[0093] 6, among the four folded-up portions 40t arranged in the axial direction, an end 40t1e of the first folded-up portion 40t1 is located radially outwardly of the maximum width position PW of the carcass 12.

[0094] In this tire 52, as in the tire 2 shown in FIG. 1, as long as the end 40te of one folded-up portion 40t is located radially outside the end 40te of the other folded-up portion 40t between two adjacent folded-up portions 40t, the end 40t2e of the second folded-up portion 40t2 may be located radially outward. The end 40t3e of the third folded-up portion 40t3 may be located radially outward. The end 40t4e of the fourth folded-up portion 40t4 may be located radially outward. Therefore, the end 40t2e of the second folded-up portion 40t2 may be located radially outward of the maximum width position PW of the carcass 10, the end 40t3e of the third folded-up portion 40t3 may be located radially outward of the maximum width position PW of the carcass 10, or the end 40t4e of the fourth folded-up portion 40t4 may be located radially outward of the maximum width position PW of the carcass 10. That is, in this tire 52, of at least two turned-up portions 40t arranged side by side in the axial direction, an end 40te of one turned-up portion 40t is located radially outward of the maximum width position PW of the carcass 12.

[0095] In this tire 2, one of at least two folded-back portions 40t arranged in the axial direction on the axial outer side of the bead 10 is located at the maximum width position PW, which is the center of the deflection of the tire 52. The folded-back portion 40t having an end 40te located radially outward of the maximum width position PW of the carcass 10 effectively increases the rigidity of the side portion. Since the amount of deflection in the side portion can be suppressed to be small, distortion is unlikely to concentrate on the RFID tag 32 arranged radially inward of the maximum width position PW of the carcass 10. In this tire 2, a decrease in durability due to the incorporation of the RFID tag 32 can be suppressed. From this viewpoint, it is preferable that the end 40te of one folded-back portion 40t arranged in the axial direction is located radially outward of the maximum width position PW of the carcass 10.

[0096] From the viewpoint of effectively increasing the rigidity of the side portion and effectively suppressing a decrease in durability due to the incorporation of the RFID tag 32, it is more preferable that the end 40te of the axially outermost folded-back portion 40t among the multiple folded-back portions 40t arranged in the axial direction, i.e., the end 40t1e of the first folded-back portion 40t1, is located radially outside the maximum width position PW of the carcass 10. In this case, from the viewpoint of gradually increasing the rigidity of the side portion from the maximum width position PW toward the bead 8 side, it is even more preferable that the end 40te of the folded-back portion 40t located on the axially outer side between two adjacent folded-back portions 40t among the multiple folded-back portions 40t arranged in the axial direction on the axially outer side of the bead 8 is located radially outside the end 40te of the folded-back portion 40t located on the axially inner side.

[0097] As is clear from the above description, according to the present invention, a bias tire can be obtained that can suppress the decrease in durability caused by the incorporation of an RFID tag. The present invention is particularly effective in industrial vehicle tires. [Industrial Applicability]

[0098] The above-described technology capable of suppressing the decrease in durability caused by the incorporation of an RFID tag can be applied to various bias tires. [Explanation of symbols]

[0099] 2. Tires 4. Tread 6, 6a, 6b...Sidewall 8, 8a, 8b...Clinch 10, 10a, 10b... Bead 12. Carcass 14 Tag member 22 Core 24. Apex 26···Carcass ply 28···Carcass cord 32... RFID Tag 34 Protective body 36 Semiconductor chips 38 Antenna 40, 40a, 40b, 40c, 40d... Winding ply 40m, 40m1, 40m2, 40m3, 40m4...Ply body 40t, 40t1, 40t2, 40t3, 40t4... Folded part 42, 42a, 42b Hanger ply 44 Carcass body 46···Carcass jacket

Claims

1. A pair of beads; a carcass extending between the pair of beads; A pair of sidewalls located axially outboard of the carcass; A pair of clinches located radially inside the sidewall; A tag member including an RFID tag; Equipped with The carcass is composed of a plurality of carcass plies including a large number of carcass cords arranged in parallel, and in each of the carcass plies, each carcass cord is inclined with respect to an equator plane, The clinch is harder than the sidewall; the tag member is located between the sidewall and the clinch; the RFID tag is located between the inner end of the sidewall and the outer end of the clinch; Bias tire.

2. The outer end of the clinch is adjacent to the carcass and is covered by the sidewall.

2. The bias tire according to claim 1.

3. Among the plurality of carcass plies, at least two of the carcass plies are turnup plies that are folded back at each of the beads, Each of the winding plies includes a ply body and a pair of turn-up portions, The ply body spans between the pair of beads, and the pair of turn-up portions are each connected to the ply body and turned up at the beads, At least two of the turned-up portions are arranged in the axial direction on the axial outer side of each of the beads, and between two adjacent turned-up portions, an end of one turned-up portion is located radially outward of an end of the other turned-up portion, Among the at least two folded-back portions arranged in the axial direction, an end of one of the folded-back portions is located radially outward of a maximum width position of the carcass.

2. The bias tire according to claim 1.

4. The carcass includes a carcass body and a carcass jacket that covers the carcass body from the outside, The carcass body includes at least two of the carcass plies, and the at least two of the carcass plies are turnup plies that are turned up at each of the beads; The carcass jacket includes at least one carcass ply, and the at least one carcass ply is a hanger ply that is not turned up at each of the beads; The tag member is disposed axially outward of the carcass jacket.

2. The bias tire according to claim 1.

5. When assembled to the rim, the RFID tag is located radially outward of the radially outer end of the rim.

2. The bias tire according to claim 1.

6. The bead includes a core and an apex located radially outward of the core, the apex includes a radially outer end of the bead, The apex tapers toward a radially outer end of the bead, The RFID tag is located radially outward of the radially outer end of the bead.

6. The bias tire according to claim 5.

7. The outer end of the clinch is located radially inside the maximum width position of the carcass.

3. The bias tire according to claim 2.

8. When mounted on a rim, an inner end of the sidewall is located radially outward of a radially outer end of the rim.

2. The bias tire according to claim 1.

9. Industrial vehicle tires, A bias tire according to any one of claims 1 to 8.

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