Non-pneumatic tire, tire and wheel assembly, method for manufacturing a non-pneumatic tire, and method for manufacturing a tire and wheel assembly

Abstract

The present invention provides a non-pneumatic tire, a tire and wheel assembly, a method for manufacturing a non-pneumatic tire, and a method for manufacturing a tire and wheel assembly that can reduce electrical resistance. [Solution] A non-pneumatic tire 1 comprises a resin case body 16, a tread member 14 disposed on the outer circumference side of the case body 16, an adhesive layer 5 for bonding the case body 16 and the tread member 14 together, and a conductive path member 4 having conductivity. The case body 16 has an inner cylinder portion 11, an outer cylinder portion 12 disposed on the outer circumference side of the inner cylinder portion 11, and a connecting portion 13 that connects the inner cylinder portion 11 and the outer cylinder portion 12 to each other. The conductive path member 4 extends on the surface of the connecting portion 13, and the conductive path member 4 has a first portion 4b that constitutes a part of the non-pneumatic tire 1 and is disposed in contact with a conductive tire component conductive member 6 that has conductivity.

Description

【Technical Field】 【0001】 The present invention relates to a non-pneumatic tire, a tire-wheel assembly, a method for manufacturing a non-pneumatic tire, and a method for manufacturing a tire-wheel-wheelatic tire-wheel assembly. 【Background Art】 【0002】 Conventionally, there has been a non-pneumatic tire provided with a resin case body (for example, Patent Document 1). 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2020-83243 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 However, in conventional non-pneumatic tires, the electrical resistance is high, and there is a risk of being charged easily during driving. 【0005】 An object of the present invention is to provide a non-pneumatic tire, a tire-wheel assembly, a method for manufacturing a non-pneumatic tire, and a method for manufacturing a tire-wheel assembly that can reduce electrical resistance. 【Means for Solving the Problems】 【0006】 〔1〕A non-pneumatic tire, comprising: a resin case body; a tread member disposed on the tire outer peripheral side of the case body; an adhesive layer for bonding the case body and the tread member to each other; a conductive path member having conductivity; and the case body includes: an inner cylinder portion; an outer cylinder portion disposed on the tire outer peripheral side of the inner cylinder portion; A connecting portion that connects the inner cylinder portion and the outer cylinder portion to each other, It has, The conductive path member extends along the surface of the connecting portion, A non-pneumatic tire having a first part which constitutes a part of the non-pneumatic tire and is arranged in contact with a conductive tire component conductive member that is conductive. 【0007】 [2] The non-pneumatic tire according to [1], wherein the tread member has a tread conductive portion that extends to the tread surface of the tread member and is electrically conductive. 【0008】 [3] The non-pneumatic tire according to [2], wherein the tire component conductive member is the tread conductive portion. 【0009】 [4] The adhesive layer has conductivity, The non-pneumatic tire according to [1] or [2], wherein the tire constituent conductive member is the adhesive layer. 【0010】 [5] The non-pneumatic tire according to any one of [1] to [4], wherein the conductive path member extends over one side of the tire circumferential direction at the connecting portion. 【0011】 [6] The connecting portion has a plurality of spokes arranged along the circumferential direction of the tire, each connecting the inner cylinder portion and the outer cylinder portion to each other. The non-pneumatic tire according to any one of [1] to [5], wherein the conductive path member extends over one of the surfaces of the spoke portion on the circumferential side of the tire. 【0012】 [7] The non-pneumatic tire according to any one of [1] to [6], wherein the conductive path member further extends within a through hole that penetrates the outer cylinder portion. 【0013】 〔8〕The non-pneumatic tire according to any one of 〔1〕to 〔7〕, wherein the conductive path member extends over the surface on the outer side in the tire width direction of the connecting portion. 【0014】 〔9〕The non-pneumatic tire according to 〔3〕, wherein the conductive path member further extends on the outer surface in the tire width direction of the non-pneumatic tire so as to reach the tread conductive portion across the adhesive layer. 【0015】 〔10〕The non-pneumatic tire according to 〔3〕, wherein the adhesive layer is not provided only in the vicinity of the conductive path member in the region between the case body and the tread member. 【0016】 〔11〕The non-pneumatic tire according to any one of 〔1〕to 〔10〕, wherein the conductive path member has a second portion arranged to contact a wheel assembled to the inner cylinder portion. 【0017】 〔12〕A tire-wheel assembly comprising: the non-pneumatic tire according to any one of 〔1〕to 〔11〕, and a wheel assembled to the inner cylinder portion. 【0018】 〔13〕A method for manufacturing a non-pneumatic tire for manufacturing the non-pneumatic tire according to any one of 〔1〕to 〔11〕, the method comprising: a case body manufacturing step of manufacturing the case body, a tread member assembling step of assembling the tread member to the outer peripheral side of the tire of the case body obtained by the case body manufacturing step, a conductive path member applying step of applying the conductive path member after the tread member assembling step. The method for manufacturing a non-pneumatic tire includes the above steps. 【0019】 〔14〕A method for manufacturing a tire-wheel assembly for manufacturing the tire-wheel assembly according to 〔12〕, the method comprising: A case body manufacturing step of manufacturing the case body, A tread member assembling step of assembling the tread member on the outer peripheral side of the tire of the case body obtained by the case body manufacturing step, A wheel assembling step of assembling a wheel on the inner cylinder portion of the case body obtained by the case body manufacturing step, A conductive path member applying step of applying the conductive path member after the tread member assembling step, A method for manufacturing a tire-wheel assembly, including: 【Advantages of the Invention】 【0020】 According to the present invention, it is possible to provide a non-pneumatic tire, a tire-wheel assembly, a method for manufacturing a non-pneumatic tire, and a method for manufacturing a tire-wheel assembly that can reduce electrical resistance. 【Brief Description of the Drawings】 【0021】 [Figure 1] A side view schematically showing a state of a tire-wheel assembly according to any one embodiment of the present invention provided with a non-pneumatic tire as viewed from one side in the tire width direction. [Figure 2] A perspective view schematically showing the tire-wheel assembly of FIG. 1. [Figure 3] An A-part cross-sectional perspective view schematically showing a portion corresponding to part A of FIG. 1 in a non-pneumatic tire and a tire-wheel assembly according to any one embodiment of the present invention in a state immediately before performing a conductive path member applying step in a method for manufacturing a non-pneumatic tire and a method for manufacturing a tire-wheel assembly according to any one embodiment of the present invention. [Figure 4] An A-part cross-sectional perspective view schematically showing a portion corresponding to part A of FIG. 1 in a non-pneumatic tire and a tire-wheel assembly according to the first embodiment of the present invention in a state after performing a conductive path member applying step in a method for manufacturing a non-pneumatic tire and a method for manufacturing a tire-wheel assembly according to the first embodiment of the present invention. [Figure 5] This is a very schematic cross-sectional perspective view of part A of the non-pneumatic tire and tire-wheel assembly according to the second embodiment of the present invention, showing the portion corresponding to part A in Figure 1 after the conductive path member application step has been performed in the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the second embodiment of the present invention. [Figure 6] This is a very schematic cross-sectional perspective view of part A of the non-pneumatic tire and tire-wheel assembly according to the third embodiment of the present invention, showing the portion corresponding to part A in Figure 1 after the conductive path member application step has been performed in the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the third embodiment of the present invention. [Figure 7] This is a very schematic cross-sectional perspective view of part A of the non-pneumatic tire and tire-wheel assembly according to the fourth embodiment of the present invention, showing the portion corresponding to part A in Figure 1 after the conductive path member application step has been performed in the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the fourth embodiment of the present invention. [Figure 8] This is a very schematic cross-sectional perspective view of part A of the non-pneumatic tire and tire-wheel assembly according to the fifth embodiment of the present invention, showing the portion corresponding to part A in Figure 1 after the conductive path member application step has been performed in the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the fifth embodiment of the present invention. [Modes for carrying out the invention] 【0022】 The non-pneumatic tire and the tire-wheel assembly according to the present invention can be mounted on any type of vehicle, and are particularly suitable for use on, for example, bicycles, motorcycles, automobiles including light vehicles, and handlebar-type electric wheelchairs. Furthermore, the non-pneumatic tire manufacturing method and the tire-wheel assembly manufacturing method according to the present invention are suitably used to manufacture the non-pneumatic tire and the tire-wheel assembly according to the present invention, respectively. 【0023】 Hereinafter, embodiments of the non-pneumatic tire, tire-wheel assembly, non-pneumatic tire manufacturing method, and tire-wheel assembly manufacturing method according to the present invention will be illustrated with reference to the drawings. Common components and parts in each figure are denoted by the same reference numeral. 【0024】 In this specification, "tire width direction WD" refers to the direction parallel to the central axis O, which is the rotation axis of the non-pneumatic tire 1 (and by extension, the tire-wheel assembly 3); "tire circumferential direction CD" refers to the direction that circles around the central axis O when viewed from the tire width direction WD; and "tire radial direction RD" refers to the radial direction when the central axis O is the center. In this specification, the direction perpendicular to the central axis O is referred to as the "direction perpendicular to the axis." In this specification, the side of the non-pneumatic tire 1 (and by extension, the tire-wheel assembly 3) closer to the center of the tire width direction WD (commonly also referred to as the "tire equatorial plane") is referred to as the "inner side WI of the tire width direction," and the side of the non-pneumatic tire 1 (and by extension, the tire-wheel assembly 3) further away from the center of the tire width direction WD is referred to as the "outer side WO of the tire width direction." Furthermore, in this specification, the side of the tire radial direction RD closer to the central axis O is referred to as the "inner side RDI of the tire radial direction" or the "inner circumference side of the tire," and the side of the tire radial direction RD further away from the central axis O is referred to as the "outer side RDO of the tire radial direction" or the "outer circumference side of the tire." In each figure, these directions are shown with arrows for reference. 【0025】 Figure 1 is a schematic side view showing a tire-wheel assembly 3 according to any embodiment of the present invention, which includes a non-pneumatic tire 1 according to any embodiment of the present invention, viewed from one side in the tire width direction WD. Figure 2 is a schematic perspective view showing the tire-wheel assembly 3 of Figure 1. Figure 3 is a very schematic cross-sectional perspective view of part A of a non-pneumatic tire 1 and a tire-wheel assembly 3 according to an arbitrary embodiment of the present invention, showing the portion corresponding to part A in Figure 1, immediately before performing the conductive path member application step (described later) in the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to an arbitrary embodiment of the present invention. Figures 4 to 8 are schematic cross-sectional perspective views of the portion corresponding to portion A in Figure 1 of the non-pneumatic tire 1 and tire-wheel assembly 3 according to the first to fifth embodiments of the present invention, after the conductive path member application step has been performed in the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the first to fifth embodiments of the present invention. In the following, for the sake of clarity, various embodiments of the present invention, including those described above, will be described in parallel. First, the basic configurations of the non-pneumatic tire 1 and tire-wheel assembly 3 according to various embodiments of the present invention will be described, and then their manufacturing methods will be described. 【0026】 As illustrated in Figures 1 and 2, the tire-wheel assembly 3 of each embodiment of the present invention comprises a non-pneumatic tire 1 and a wheel 2 according to any one embodiment of the present invention. The wheel 2 is assembled to the inner cylinder portion 11 (described later) of the non-pneumatic tire 1. The tire-wheel assembly 3 is attached to the axle of a vehicle (not shown) via the wheel 2. That is, the non-pneumatic tire 1 is attached to the axle of a vehicle via the wheel 2 and put into use. The wheel 2 is preferably made of metal or the like and is electrically conductive. 【0027】 The non-pneumatic tire 1 is formed in a substantially annular shape. The wheel 2 on which the non-pneumatic tire 1 is mounted is formed in a substantially disc shape. The central axis O of the wheel 2 is configured to coincide with the central axis O of the non-pneumatic tire 1. 【0028】 As shown in Figures 1-2 and 4-8, in each embodiment of the present invention, the non-pneumatic tire 1 comprises a case body 16, a tread member 14, an adhesive layer 5 (Figures 3-8), and a conductive path member 4 (Figures 4-8). In Figures 1-2, the adhesive layer 5 and the conductive path member 4 are not shown. 【0029】 The case body 16 has an inner cylinder portion 11, an outer cylinder portion 12, and a connecting portion 13. The inner cylinder portion 11 is cylindrical in shape and is configured to be attached to the axle via the wheel 2. The wheel 2 is assembled to the inner circumference side of the inner cylinder portion 11. The outer cylinder portion 12 is cylindrical in shape and is positioned further apart from the inner cylinder portion 11 towards the outer circumference of the tire. The central axis O of the inner cylinder portion 11 and the outer cylinder portion 12 is arranged coaxially with the central axis O of the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3). The connecting portion 13 is located between the inner cylinder portion 11 and the outer cylinder portion 12 in the tire radial direction RD, and connects the inner cylinder portion 11 and the outer cylinder portion 12 to each other. The connecting portion 13 is configured to be elastically deformable. 【0030】 The case body 16 is made of resin. A thermoplastic resin is preferred as the resin constituting the case body 16. The thermoplastic resin that can constitute the case body 16 may be, for example, a single resin, a mixture containing two or more resins, or a mixture containing one or more resins and one or more elastomers, and may also contain additives such as antioxidants, plasticizers, fillers, or pigments. The inner cylinder portion 11, the outer cylinder portion 12, and the connecting portion 13 may be integrally formed by injection molding or the like, thereby the entire case body 16 may be composed of a single part. The elastic modulus of the material forming the case body 16 can be, for example, 100 MPa or more and 1500 MPa or less. Since the case body 16 is made of resin, it can be made lighter, but because it has high electrical resistance, it tends to become easily charged while the vehicle is in motion. 【0031】 In each of the illustrated embodiments, as shown in Figures 1 and 2, the connecting portion 13 has a plurality of spoke portions 13s. These plurality of spoke portions 13s are arranged spaced apart from each other along the tire circumferential direction CD, and each connects the inner cylinder portion 11 and the outer cylinder portion 12 to each other. Each spoke portion 13s is configured to be substantially plate-shaped. In each of the embodiments shown, the thickness of each spoke portion 13s in the tire circumferential direction CD is thinner than the length of the tire width direction WD. The cross-sectional shape of each spoke portion 13s in the direction perpendicular to the axis is uniform (same) along the tire width direction WD. However, the connecting portion 13 may have other shapes in addition to having a plurality of spoke portions 13s. 【0032】 The tread member 14 is positioned on the outer circumference side of the tire of the case body 16. The tread member 14 is provided so as to cover the entire outer circumference of the outer cylinder portion 12. In other words, the tread member 14 is formed in a cylindrical shape that extends in the tire width direction WD with respect to the central axis O. The outer surface of the tread member 14 on the tire circumference side constitutes a tread tread surface 14f configured to contact the road surface. The tread tread surface 14f may be provided with one or more grooves 14g. The tread member 14 may be configured to cover only the outer surface of the tire on the outer circumferential side of the outer cylinder portion 12 of the case body 16, as shown in each illustrated embodiment, or, although not shown, it may be configured to cover both the outer surface of the tire on the outer circumferential side of the outer cylinder portion 12 of the case body 16 and at least a portion of the outer surfaces (sides) on both sides in the tire width direction WD. 【0033】 The tread member 14 is preferably formed from rubber (for example, natural rubber and / or vulcanized rubber obtained by vulcanizing a rubber composition) or a thermoplastic material. Examples of thermoplastic materials that can constitute the tread member 14 include thermoplastic elastomers or thermoplastic resins. Examples of thermoplastic elastomers include amide-based thermoplastic elastomers (TPA), ester-based thermoplastic elastomers (TPC), olefin-based thermoplastic elastomers (TPO), styrene-based thermoplastic elastomers (TPS), urethane-based thermoplastic elastomers (TPU), thermoplastic rubber crosslinks (TPV), or other thermoplastic elastomers (TPZ) as specified in JIS K6418. Examples of thermoplastic resins that can constitute the tread member 14 include urethane resin, olefin resin, vinyl chloride resin, or polyamide resin. 【0034】 The tread member 14 may have a tread conductive portion 14c (Figures 3 to 8). The tread conductive portion 14c extends to the tread tread surface 14f of the tread member 14, that is, it has a portion located within the tread tread surface 14f (Figures 3 to 8). Preferably, the tread conductive portion 14c also has a portion located within the surface of the tread member 14 other than the tread tread surface 14f, and thus extends from the surface of the tread member 14 other than the tread tread surface 14f to the tread tread surface 14f. For example, as shown in the examples in Figures 3 to 8, the tread conductive portion 14c has a portion located within the surface on the inner circumference side of the tire of the tread member 14, and thus extends from the surface on the inner circumference side of the tire of the tread member 14 to the tread tread surface 14f. The tread conductive portion 14c is conductive. The tread conductive portion 14c may constitute any part of the tread member 14. The tread conductive portion 14c may constitute only a part of the tread member 14, as illustrated by the dashed lines in Figures 3 to 8, or it may constitute the entirety of the tread member 14. The tread conductive portion 14c is preferably made of conductive rubber, and may be made of rubber containing 50 parts by mass or more of carbon black (for example, diene-based rubber). When the tread member 14 has a tread conductive portion 14c, electricity flows more easily within the tread member 14, further reducing electrical resistance and making it easier to discharge static electricity generated during driving to the tread surface 14f (and consequently to the road surface). 【0035】 The adhesive layer 5 (Figures 3 to 8) is made of adhesive and is located between the case body 16 (specifically, the outer cylinder portion 12) and the tread members 14, bonding the case body 16 and the tread members 14 together. As shown in each illustrated embodiment, if the tread member 14 is configured to cover only the outer surface of the outer cylinder portion 12 of the case body 16 that is on the outer circumference of the tire, the adhesive layer 5 may be located only on the outer surface of the outer cylinder portion 12 that is on the outer circumference of the tire. On the other hand, although not shown, if the tread member 14 is configured to cover both the outer surface of the outer cylinder portion 12 of the case body 16 that is on the outer circumference of the tire and at least a portion of both the outer surfaces (sides) on both sides in the tire width direction WD, the adhesive layer 5 may be located on both the outer surface of the tire that is on the outer cylinder portion 12 and at least a portion of both the outer surfaces (sides) on both sides in the tire width direction WD. The adhesive layer 5 may or may not be conductive. If the adhesive layer 5 is conductive, it is preferable to use an adhesive containing 50 parts by mass or more of carbon as the adhesive constituting the adhesive layer 5. If the adhesive layer 5 is not electrically conductive, the adhesive constituting the adhesive layer 5 may be, for example, a urethane-based adhesive. 【0036】 The conductive path member 4 is conductive. One or more conductive path members 4 may be provided. If multiple conductive path members 4 are provided, unless otherwise specified, the configuration of the conductive path member 4 described herein may be applied to each of the conductive path members 4. The configurations of each conductive path member 4 may be the same or different. The conductive path member 4 may be any conductive material, such as ink (i.e., paste), tape (e.g., cloth tape), fiber (e.g., cloth made of fiber), wire, and / or rubber, each of which is conductive. The ink that can constitute the conductive path member 4 may mainly consist of polyurethane resin, polyester resin, or acrylic resin. The ink that can constitute the conductive path member 4 may also contain carbon black and / or graphite. It is preferable that the ink that can constitute the conductive path member 4 does not contain metallic conductive materials such as copper or aluminum, as this reduces the risk of the conductive path member 4 breaking during operation. The thickness of the conductive path member 4 is preferably, for example, 0.01 to 1 mm. 【0037】 As shown in the embodiments in Figures 4 to 8, the conductive path member 4 extends on the surface (not inside) of the connecting portion 13 of the case body 16. The conductive path member 4 is not provided inside the connecting portion 13. As shown in the embodiments in Figures 4 to 8, the conductive path member 4 may also be provided on other parts of the non-pneumatic tire 1 or tire-wheel assembly 3 (for example, the surface of the outer cylinder portion 12 and / or inner cylinder portion 11 of the case body 16, inside the through hole H (Figures 5 to 6) penetrating the outer cylinder portion 12, the surface of the adhesive layer 5, the surface of the tread member 14, the surface of the wheel 2, etc.). Preferably, the conductive path member 4 is applied to or attached to the surface of the non-pneumatic tire 1 or tire-wheel assembly 3 (specifically, for example, the connecting portion 13 of the case body 16, the outer cylinder portion 12, and / or the inner cylinder portion 11, the surface of the adhesive layer 5, the surface of the tread member 14, the surface of the wheel 2, etc.) so that it is maintained in contact with the said surface. By providing the conductive path member 4, electrical resistance can be reduced, making it easier to discharge static electricity generated in the case body 16 during operation. 【0038】 As shown in the embodiments in Figures 4 to 8, the conductive path member 4 has a first part 4b that is arranged to be in contact with the tire component conductive member 6. That is, in the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3), the first part 4b is in contact with the tire component conductive member 6. The tire component conductive member 6 is a component that constitutes a part of the non-pneumatic tire 1 and is conductive. Examples of the tire component conductive member 6 that is in contact with the first part 4b of the conductive path member 4 include the adhesive layer 5 or the tread conductive part 14c. In the embodiments shown in Figures 5 and 7, the tire-constituting conductive member 6 that contacts the first part 4b of the conductive path member 4 is the adhesive layer 5. That is, in the embodiments shown in Figures 5 and 7, the adhesive layer 5 is conductive. In the embodiments of Figures 4, 6, and 8, the tire component conductive member 6 that contacts the first part 4b of the conductive path member 4 is the tread conductive portion 14c. In the embodiments of Figures 4, 6, and 8, the adhesive layer 5 may or may not be conductive. The conductive path member 4 has a first portion 4b that is positioned to be in contact with the tire component conductive member 6, thereby facilitating the flow of electricity between the conductive path member 4 and the conductive tire component conductive member 6. As shown in the embodiments in Figures 4 to 8, the first part 4b may be either one of the two ends of the conductive path member 4 in the extending direction. 【0039】 Next, we will describe the method for manufacturing the non-pneumatic tire 1 and tire-wheel assembly 3 according to each of the embodiments described above. The non-pneumatic tire manufacturing methods according to each embodiment of the present invention can be suitably used to manufacture a non-pneumatic tire 1 according to any one embodiment of the present invention. The tire-wheel assembly manufacturing methods according to each embodiment of the present invention can be suitably used to manufacture a tire-wheel assembly 3 according to any one embodiment of the present invention. Each embodiment of the present invention includes a method for manufacturing a non-pneumatic tire and a method for manufacturing a tire-wheel assembly, each comprising a case body manufacturing step, a tread member assembly step, and a conductive path member application step. Each embodiment of the present invention further includes a wheel assembly step. Figures 4 to 8 show the completed state of the non-pneumatic tire 1 and tire-wheel assembly 3 according to the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method in the first to fifth embodiments, respectively. 【0040】 First, in the case body manufacturing step, the case body 16 is manufactured. The case body 16 may be integrally molded, for example, by injection molding. 【0041】 Following the case body manufacturing step, in the tread member assembly step, the tread member 14 is assembled to the outer circumference of the case body 16 obtained in the case body manufacturing step via an adhesive layer 5. This completes the non-pneumatic tire 1, excluding the conductive path member 4. 【0042】 In the wheel assembly step, the wheel 2 is assembled to the inner cylinder portion 11 of the case body 16 obtained in the case body manufacturing step (Figure 3). 【0043】 The step of applying the conductive path member is performed after the tread member assembly step. In a tire and wheel assembly manufacturing method, the step of applying the conductive path member may be performed before the wheel assembly step or after the wheel assembly step. In the conductive path member application step, the conductive path member 4 is applied (coated, attached, etc.) to the non-pneumatic tire 1 or tire-wheel assembly 3 obtained by the previous step (Figures 4 to 8). In the conductive path member application step, the conductive path member 4 is applied at least to the surface of the connecting portion 13 of the case body 16 obtained by the case body manufacturing step. In the conductive path member application step, as shown in each embodiment of Figures 4 to 8, the conductive path member may also be applied to other parts of the non-pneumatic tire 1 or tire-wheel assembly 3 (for example, the surface of the outer cylinder portion 12 and / or inner cylinder portion 11 of the case body 16, inside the through hole H (Figures 5 to 6) penetrating the outer cylinder portion 12, the surface of the adhesive layer 5, the surface of the tread member 14, the surface of the wheel 2, etc.). In the step of providing the conductive path member, the conductive path member 4 is provided such that it has a first portion 4b that is positioned to be in contact with the tire component conductive member 6. That is, the first portion 4b of the conductive path member 4 is in contact with the tire component conductive member 6. 【0044】 After the case body manufacturing step, the tread member assembly step, and the conductive path member application step, a non-pneumatic tire 1 according to any embodiment of the present invention is completed (Figures 4 to 8). Furthermore, after the case body manufacturing step, the tread member assembly step, the wheel assembly step, and the conductive path member application step, a tire-wheel assembly 3 according to any embodiment of the present invention is completed (Figures 4 to 8). 【0045】 According to each embodiment of the present invention described above, as stated above, the conductive path member 4 having conductivity extends on the surface of the connecting portion 13 of the resin case body 16 and has a first portion 4b that is arranged to be in contact with the conductive tire component conductive member 6. As a result, while a vehicle equipped with the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3) is in motion, static electricity generated in the case body 16 passes through the conductive path member 4 extending on the surface of the connecting portion 13 of the case body 16, and is then transmitted to the conductive tire component conductive member 6, from where it can be discharged, for example, to the road surface. In this way, the electrical resistance of the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3) is reduced, and static charge buildup during driving is suppressed. There is a demand in the industry for suppressing static charge buildup, and this product can meet that demand. Furthermore, since the conductive path member 4 is not provided inside the connecting portion 13 of the case body 16, but rather on the surface of the connecting portion 13, the risk of affecting the strength and performance of the connecting portion 13 and, consequently, the non-pneumatic tire 1 can be avoided. Furthermore, the conductive path member 4 is provided to extend on the surface of the connecting portion 13 of the resin case body 16 and to have a first portion 4b that is positioned to be in contact with the conductive tire component conductive member 6. Therefore, the process of applying the conductive path member 4 (conductive path member application step) can be performed after the adhesive layer 5 and the tread member 14 have been assembled (after the tread member assembly step), and consequently, after the parts of the non-pneumatic tire 1 other than the conductive path member 4 have been completed. This avoids a decrease in durability and strength. If the process of applying the conductive path member 4 (conductive path member application step) is performed before the parts of the non-pneumatic tire 1 other than the conductive path member 4 are completed (for example, during or after the case body manufacturing step, or before or during the tread member assembly step, etc.), there is a risk of a decrease in durability and strength. 【0046】 In each example described herein, it is preferable that the conductive path member 4 has a second part 4d (Figures 4 to 8) which is made of metal or the like and is arranged to be in contact with the conductive wheel 2. That is, in the tire-wheel assembly 3, the second part 4d is in contact with the wheel 2. Furthermore, if the conductive path member application step is performed before the wheel assembly step, in the conductive path member application step, the conductive path member 4 is applied to the surface of the case body 16 (specifically, the inner cylinder portion 11) such that it has a second portion 4d that is positioned to contact the wheel 2 which will be assembled in the subsequent wheel assembly step. In other words, the second portion 4d is pre-positioned to contact the wheel 2 at the position where the wheel 2 will be placed later. The presence of the second part 4d facilitates the flow of electricity between the conductive path member 4 and the conductive wheel 2, thereby further reducing electrical resistance and suppressing static charge buildup during driving. As shown in the embodiments in Figures 4 to 8, the second part 4d may be either one of the two ends of the conductive path member 4 in the extending direction. 【0047】 The conductive path member 4 provided in the conductive path member application step may extend in any form to any portion of the surface of the connecting portion 13 of the case body 16. 【0048】 For example, in each example described herein, the conductive path member 4 may extend over the outer surface (side surface) WO in the tire width direction of the connecting portion 13 of the case body 16, as in the embodiments of Figures 4, 7, and 8. For example, if the connecting portion 13 of the case body 16 has a plurality of spoke portions 13s, as in the embodiments of Figures 4, 7, and 8, the conductive path member 4 may extend over the outer surface (side surface) WO in the tire width direction of at least one spoke portion 13s. In this case, the conductive path member 4 may extend from the portion extending over the outer surface (side surface) WO in the tire width direction of the connecting portion 13 of the case body 16, as shown in the embodiments of Figures 4, 7, and 8, to the second portion 4d (and thus to the wheel 2) of the inner cylindrical portion 11 of the case body 16, and further extend over the outer surface (side surface) WO in the tire width direction of the inner cylindrical portion 11 of the case body 16. 【0049】 In each example described herein, when the conductive path member 4 extends along the outer surface (side surface) WO in the tire width direction at the connecting portion 13 of the case body 16 as described above, it may extend, as in the embodiment of Figure 4, beyond the outer surface WO in the tire width direction at the connecting portion 13 of the case body 16, to the first portion 4b, and subsequently to the tread conductive portion 14c as the tire constituent conductive member 6, across the adhesive layer 5. In this case, static electricity is more easily discharged from the conductive path member 4 to the road surface via the tread conductive portion 14c (tire constituent conductive member 6). In this case, the adhesive layer 5 may or may not be conductive. Here, "spanning the adhesive layer 5" means extending over the surface of the adhesive layer 5. In other words, in this case, the conductive path member 4 extends over the outer surface WO in the tire width direction of the adhesive layer 5. Furthermore, between the portion of the conductive path member 4 extending over the outer surface (side surface) WO in the tire width direction of the connecting portion 13 and the portion extending over the surface of the adhesive layer 5, the conductive path member 4 may also extend over the outer surface (side surface) WO in the tire width direction of the outer cylinder portion 12 of the case body 16, as shown in the example in Figure 4. 【0050】 In each example described herein, if the conductive path member 4 extends along the outer surface (side surface) WO in the tire width direction at the connecting portion 13 of the case body 16 as described above, and then extends to the first portion 4b, and subsequently to the tread conductive portion 14c as the tire constituent conductive member 6, then, as in the embodiment of Figure 8, the adhesive layer 5 does not have to be provided only in the vicinity of the conductive path member 4 that extends between the case body 16 (specifically, the outer cylinder portion 12) and the tread member 14, within the region between the case body 16 (specifically, the outer cylinder portion 12) and the tread member 14. In this case, the conductive path member 4 does not extend on the surface of the adhesive layer 5 (i.e., does not come into contact with the adhesive layer 5). In this case as well, static electricity is more easily discharged, for example, from the conductive path member 4 through the tread conductive portion 14c (tire constituent conductive member 6) to the road surface. Furthermore, in this case, the conductive path member 4 does not extend on the surface of the adhesive layer 5 (i.e., it does not come into contact with the adhesive layer 5), thus reducing the risk of the conductive path member 4 breaking during driving or other activities. In this case, during the tread member assembly step, the adhesive layer 5 may be placed between the case body 16 (specifically, the outer cylinder portion 12) and the tread member 14, avoiding only the portion of the conductive path member 4 that will be applied in the subsequent conductive path member application step that extends between the case body 16 (specifically, the outer cylinder portion 12) and the tread member 14. In this example, the adhesive layer 5 may or may not be conductive. Furthermore, the conductive path member 4 may extend over the outer surface (side surface) of the outer cylinder portion 12 of the case body 16 in the tire width direction, as shown in the example in Figure 8, between the portion extending over the outer surface (side surface) of the outer surface WO in the tire width direction of the connecting portion 13 and the first portion 4b. 【0051】 In each example described herein, when the conductive path member 4 extends along the outer surface (side surface) WO in the tire width direction at the connecting portion 13 of the case body 16 as described above, it may extend, as in the embodiment of Figure 7, from the surface WO in the tire width direction at the connecting portion 13 of the case body 16 to the first portion 4b, and subsequently to the adhesive layer 5 as the tire constituent conductive member 6. In this case, the adhesive layer 5 is conductive. In this case, it is preferable that the tread conductive portion 14c is in contact with the adhesive layer 5, as illustrated in Figure 7. In this case, static electricity flows from the conductive path member 4 to the adhesive layer 5 (tire constituent conductive member 6), and then is more easily discharged by reaching the road surface via the tread conductive portion 14c. Furthermore, the conductive path member 4 may extend over the outer surface (side surface) of the outer cylinder portion 12 of the case body 16 in the tire width direction, as shown in the example in Figure 7, between the portion extending over the outer surface (side surface) of the outer surface WO in the tire width direction of the connecting portion 13 and the first portion 4b. 【0052】 And / or, in each example described herein, the conductive path member 4 may extend over either one side of the tire circumferential CD of the connecting portion 13 of the case body 16, as in the embodiments of Figures 5 and 6. For example, if the connecting portion 13 of the case body 16 has a plurality of spoke portions 13s, as in the embodiments of Figures 5 and 6, the conductive path member 4 may extend over either one side of the tire circumferential CD of at least one spoke portion 13s. In this case, as shown in the embodiments of Figures 5 and 6, the conductive path member 4 may extend from the portion of the connecting portion 13 of the case body 16 that extends over the surface on the tire circumferential CD side, to the surface of the inner cylinder portion 11 of the case body 16 that is on the tire outer circumference side, and further to the outer surface (side surface) of the inner cylinder portion 11 that is on the tire width side WO, until it reaches the second portion 4d (and thus the wheel 2). 【0053】 In each example described herein, if the conductive path member 4 extends over one of the surfaces of the connecting portion 13 of the case body 16 on the side of the tire circumferential direction CD, as described above, it may further extend through the through hole H that penetrates the outer cylinder portion 12, following the portion that extends over the surface of the connecting portion 13 of the case body 16 on the side of the tire circumferential direction CD, as shown in the embodiments of Figures 5 and 6, and then extend to the first portion 4b, and subsequently to the tire constituent conductive member 6. The through hole H penetrates the outer cylinder portion 12 in the thickness direction of the outer cylinder portion 12, that is, it extends from the surface of the outer cylinder portion 12 on the tire inner circumferential side to the surface of the outer cylinder portion 12 on the tire outer circumferential side. The through hole H of the outer cylinder portion 12 may be formed in the case body manufacturing step. In this case, the conductive path member 4 extends into the interior of the outer cylindrical portion 12 of the case body 16, but does not extend into the interior of the connecting portion 13 of the case body 16. Therefore, the risk of affecting the strength and performance of the connecting portion 13 and, consequently, the non-pneumatic tire 1 can be avoided. 【0054】 In each example described herein, the conductive path member 4 extends along either side of the tire circumferential CD of the connecting portion 13 of the case body 16 as described above, and then extends further through the through hole H that penetrates the outer cylinder portion 12. Alternatively, as shown in the embodiment of Figure 5, it may extend through the through hole H of the outer cylinder portion 12 to the first portion 4b, and subsequently to the adhesive layer 5 as the tire constituent conductive member 6. In this case, the adhesive layer 5 is conductive. In this case, it is preferable that the tread conductive portion 14c is in contact with the adhesive layer 5, as illustrated in Figure 5. In this case, static electricity flows from the conductive path member 4 to the adhesive layer 5 (tire constituent conductive member 6) and then easily discharges to the road surface via the tread conductive portion 14c. 【0055】 In each example described herein, if the conductive path member 4 extends along either side of the tire circumferential direction CD of the connecting portion 13 of the case body 16 as described above, and then extends further through the through hole H that penetrates the outer cylinder portion 12, it may extend, as in the embodiment of Figure 6, to the first portion 4b, and subsequently to the tread conductive portion 14c as the tire constituent conductive member 6. In this case, static electricity is more easily discharged from the conductive path member 4 to the road surface via the tread conductive portion 14c (tire constituent conductive member 6). In this case, the adhesive layer 5 may or may not be conductive. Also, in this case, the adhesive layer 5 may be in contact with the conductive path member 4 that extends between the outer cylinder portion 12 and the tread member 14, or it may be provided so as not to be in contact with the conductive path member 4 that extends between the outer cylinder portion 12 and the tread member 14. 【0056】 [Contribution to the United Nations-led Sustainable Development Goals (SDGs)] The SDGs have been proposed to realize a sustainable society. One embodiment of the present invention is considered to be a technology that can contribute to "No. 7: Affordable and Clean Energy" and "No. 13: Climate Action," among others. [Industrial applicability] 【0057】 The non-pneumatic tire and the tire-wheel assembly according to the present invention can be mounted on any type of vehicle, and are particularly suitable for use on, for example, bicycles, motorcycles, automobiles including light vehicles, and handlebar-type electric wheelchairs. Furthermore, the non-pneumatic tire manufacturing method and the tire-wheel assembly manufacturing method according to the present invention are suitably used to manufacture the non-pneumatic tire and the tire-wheel assembly according to the present invention, respectively. [Explanation of Symbols] 【0058】 1: Non-pneumatic tires, 16: Case body, 11: Inner cylinder section, 12: Outer cylinder part, H: Through hole, 13: Connection part, 13s: Spoke section, 14: Tread material, 14f: Tread surface, 14c: Tread conductive part, 14g: Groove, 2: Wheels, 3: Tire and wheel assembly, 4: Conductive path member, 4b: Part 1, 4d: Part 2, 5: Adhesive layer, 6: Conductive components of the tire CD: Tire circumferential direction, RD: Tire radial direction, RDI: Inner radial direction of tire, RDO: Outer radial direction of tire WD: tire width direction, WI: inner side in the tire width direction, WO: outer side in the tire width direction, O: Central axis

Claims

[Claim 1] Non-pneumatic tires, A resin case body, A tread member is arranged on the outer circumference side of the tire of the aforementioned case body, An adhesive layer for bonding the case body and the tread member together, A conductive path member having conductivity, Equipped with, The aforementioned case body is Inner cylinder part, The outer cylinder portion is positioned on the outer circumference side of the tire of the inner cylinder portion, A connecting portion that connects the inner cylinder portion and the outer cylinder portion to each other, It has, The conductive path member extends along the surface of the connecting portion, A non-pneumatic tire having a first part which constitutes a part of the non-pneumatic tire and is arranged in contact with a conductive tire component conductive member that is conductive. [Claim 2] The non-pneumatic tire according to claim 1, wherein the tread member has a tread conductive portion that extends to the tread surface of the tread member and is electrically conductive. [Claim 3] The non-pneumatic tire according to claim 2, wherein the tire component conductive member is the tread conductive portion. [Claim 4] The adhesive layer has conductivity, The non-pneumatic tire according to claim 1, wherein the tire constituent conductive member is the adhesive layer. [Claim 5] The non-pneumatic tire according to claim 1, wherein the conductive path member extends over one side of the connecting portion in the circumferential direction of the tire. [Claim 6] The connecting portion has a plurality of spokes arranged along the circumferential direction of the tire, each connecting the inner cylinder portion and the outer cylinder portion to each other. The non-pneumatic tire according to claim 5, wherein the conductive path member extends over one of the surfaces of the spoke portion on the circumferential side of the tire. [Claim 7] The non-pneumatic tire according to claim 1, wherein the conductive path member further extends within a through hole that penetrates the outer cylinder portion. [Claim 8] The non-pneumatic tire according to claim 1, wherein the conductive path member extends over the outer surface in the tire width direction at the connecting portion. [Claim 9] The non-pneumatic tire according to claim 3, wherein the conductive path member further extends on the outer surface of the non-pneumatic tire in the tire width direction, across the adhesive layer, to the tread conductive portion. [Claim 10] The non-pneumatic tire according to claim 3, wherein the adhesive layer is not provided in the region between the case body and the tread member, but only in the portion near the conductive path member. [Claim 11] The non-pneumatic tire according to claim 1, wherein the conductive path member has a second portion that is arranged to contact the wheel assembled to the inner cylinder portion. [Claim 12] A non-pneumatic tire according to any one of claims 1 to 11, The wheel assembled to the inner cylinder portion, A tire and wheel assembly equipped with these features. [Claim 13] A method for manufacturing a non-pneumatic tire according to any one of claims 1 to 11, A case body manufacturing step, which involves manufacturing the aforementioned case body, A tread member assembly step involves assembling the tread member to the outer circumference of the tire of the case body obtained in the case body manufacturing step, A conductive path member application step is performed after the tread member assembly step, in which the conductive path member is applied. A method for manufacturing non-pneumatic tires, including the method described above. [Claim 14] A method for manufacturing a tire and wheel assembly as described in claim 12, A case body manufacturing step, which involves manufacturing the aforementioned case body, A tread member assembly step involves assembling the tread member to the outer circumference of the tire of the case body obtained in the case body manufacturing step, A wheel assembly step involves assembling a wheel onto the inner cylinder portion of the case body obtained in the case body manufacturing step, A conductive path member application step is performed after the tread member assembly step, in which the conductive path member is applied. A method for manufacturing tire and wheel assemblies, including the method described above.

Images