Non-pneumatic tire, tire / wheel assembly, non-pneumatic tire manufacturing method, and tire / wheel assembly manufacturing method
The non-pneumatic tire design with a surface-mounted conductive path member and adhesive layer effectively addresses high electrical resistance, enabling efficient discharge of static electricity and reducing charge buildup.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- BRIDGESTONE CORP
- Filing Date
- 2025-11-10
- Publication Date
- 2026-06-11
AI Technical Summary
Conventional non-pneumatic tires exhibit high electrical resistance, leading to a risk of static charge buildup during driving.
A non-pneumatic tire design incorporating a resin case body with an adhesive layer and conductive path member, where the conductive path member extends on the surface and connects to both the adhesive layer and the tread member, facilitating the discharge of static electricity.
Reduces electrical resistance and suppresses static charge buildup by allowing static electricity to be easily discharged to the road surface, improving safety and efficiency.
Smart Images
Figure JP2025039340_11062026_PF_FP_ABST
Abstract
Description
Non-pneumatic tire, tire-wheel assembly, method for manufacturing non-pneumatic tire, and method for manufacturing tire-wheel assembly 【0001】 This application claims priority based on Japanese Patent Application No. 2024-210741 filed in Japan on December 3, 2024, the entire content of which is incorporated herein by reference. 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 assembly. 【0002】 Conventionally, there has been a non-pneumatic tire provided with a resin case body (for example, Patent Document 1). 【0003】 Japanese Patent Application Laid-Open No. 2020-83243 【0004】 However, in conventional non-pneumatic tires, the electrical resistance is high, and there is a risk of being charged 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. 【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 that adheres the case body and the tread member and has conductivity; and a conductive path member having conductivity. The case body has an inner cylinder portion, an outer cylinder portion disposed on the tire outer peripheral side of the inner cylinder portion, and a connecting portion that connects the inner cylinder portion and the outer cylinder portion to each other. The conductive path member extends on the surface of the case body and has a first portion disposed so as to contact the adhesive layer. 【0007】 [8] A tire-wheel assembly comprising the non-pneumatic tire according to [1] and a wheel assembled to the inner cylinder portion. 【0008】A method for manufacturing a non-pneumatic tire as described in [9] [1], comprising: a case body manufacturing step of manufacturing the case body; a conductive path member application step of applying the conductive path member to the surface of the case body obtained by the case body manufacturing step; and a tread member assembly step of assembling the tread member to the tire outer circumference side of the case body via the adhesive layer after the conductive path member application step. 【0009】
[10] A method for manufacturing a tire and wheel assembly, comprising: a non-pneumatic tire manufacturing step of manufacturing a non-pneumatic tire by the non-pneumatic tire manufacturing method described in [9]; and a wheel assembly step of assembling a wheel onto the inner cylinder portion of the non-pneumatic tire. 【0010】 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. 【0011】 Figure 1 is a schematic side view showing a tire-wheel assembly according to any one embodiment of the present invention, equipped with a non-pneumatic tire according to any one embodiment of the present invention, viewed from one side in the tire width direction. Figure 1 is a schematic perspective view showing the tire-wheel assembly. Figures 3(a) and 3(b) are schematic cross-sectional perspective views of part A, showing the process by which part of the tire-wheel assembly according to the first embodiment of the present invention, corresponding to part A in Figure 1, is manufactured by the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the first embodiment of the present invention. Figures 4(a) and 4(b) are schematic cross-sectional perspective views of part A, showing the process by which part of the tire-wheel assembly according to the second embodiment of the present invention, corresponding to part A in Figure 1, is manufactured by the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the second embodiment of the present invention. 【0012】The non-pneumatic tire and the tire-wheel assembly according to the present invention can be mounted and used on any type of vehicle, and are particularly suitable for use on, for example, bicycles, motorcycles, automobiles including light vehicles, and electric wheelchairs with handlebars. 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. 【0013】 The following describes 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, with reference to the drawings. Common members and parts in each figure are denoted by the same reference numerals. 【0014】 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 consequently, 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 "direct axis direction." In this specification, the side of the non-pneumatic tire 1 (and consequently, the tire-wheel assembly 3) closer to the center of the tire width direction WD (generally also referred to as the "tire equatorial plane") is referred to as the "inner side of the tire width direction WI," and the side of the non-pneumatic tire 1 (and consequently, the tire-wheel assembly 3) further from the center of the tire width direction WD is referred to as the "outer side of the tire width direction WO." Furthermore, in this specification, the side of the tire radial direction RD that is closer to the central axis O is referred to as the "inner radial RDI" or "inner circumference side of the tire," and the side of the tire radial direction RD that is further from the central axis O is referred to as the "outer radial RDO" or "outer circumference side of the tire." In each figure, these directions are shown with arrows for reference. 【0015】Figure 1 is a schematic side view showing a tire-wheel assembly 3 according to any embodiment of the present invention, equipped with 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. Figures 3(a) and 3(b) are schematic cross-sectional perspective views of part A, showing the process by which part of the tire-wheel assembly 3 according to the first embodiment of the present invention, corresponding to part A in Figure 1, is manufactured by the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the first embodiment of the present invention. Note that in Figure 3(b), the tire-wheel assembly 3 according to the first embodiment of the present invention is in the completed state after manufacturing. Figures 4(a) and 4(b) are schematic cross-sectional perspective views of part A, showing the process by which part of the tire-wheel assembly 3 according to the second embodiment of the present invention, corresponding to part A in Figure 1, is manufactured by the non-pneumatic tire manufacturing method and tire-wheel assembly manufacturing method according to the second embodiment of the present invention. In Figure 4(b), the tire-wheel assembly 3 according to the second embodiment of the present invention is shown in its completed state after manufacturing. For the sake of convenience, various embodiments of the present invention, including these embodiments, will be described in parallel below. 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. 【0016】 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. 【0017】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. 【0018】 As shown in Figures 1-2, 3(b), and 4(b), 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(b) and 4(b)), and a conductive path member 4 (Figures 3(b) and 4(b)). In Figures 1 and 2, the adhesive layer 5 and the conductive path member 4 are not shown. 【0019】 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 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 and is positioned spaced further outward than the inner cylinder portion 11. The central axes O of the inner cylinder portion 11 and the outer cylinder portion 12 are coaxial 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. 【0020】The case body 16 is made of resin. A thermoplastic resin is preferred as the resin that constitutes 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, so that the entire case body 16 is made of one 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 is possible to reduce its weight, but because it has high electrical resistance, it tends to become charged easily while the vehicle is running. 【0021】 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 or instead of having a plurality of spoke portions 13s. 【0022】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 extending in the tire width direction WD with respect to the central axis O. The outer circumference side surface of the tread member 14 constitutes a tread tread surface 14f configured to contact the road surface. One or more grooves 14g may be provided on the tread tread surface 14f. The tread member 14 may be configured to cover only the outer circumference side surface of the outer cylinder portion 12 of the case body 16, as shown in each illustrated embodiment, or, although not shown, may be configured to cover both the outer circumference side surface 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. 【0023】 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 crosslinked materials (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. 【0024】The tread member 14 may have a tread conductive portion 14c (Figures 3(b) and 4(b)). The tread conductive portion 14c extends between the adhesive layer 5 and the tread surface 14f of the tread member 14 (from the adhesive layer 5 to the tread surface 14f). The tread conductive portion 14c is electrically conductive. The tread conductive portion 14c may constitute only a part of the tread member 14, as illustrated by the dashed lines in Figures 3(b) and 4(b), 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 between the conductive adhesive layer 5 and the tread surface 14f, further reducing electrical resistance. This makes it easier for static electricity generated in the case body 16 during driving to discharge from the adhesive layer 5 to the tread surface 14f (and ultimately to the road surface). 【0025】 The adhesive layer 5 (Figures 3(b) and 4(b)) 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. The adhesive layer 5 is conductive. It is preferable to use an adhesive containing 50 parts by mass or more of carbon as the conductive adhesive layer 5. In each of the illustrated embodiments, when the tread member 14 is configured to cover only the tire outer circumference side surface of the outer cylinder portion 12 of the case body 16, the adhesive layer 5 may be located only on the tire outer circumference side surface of the outer cylinder portion 12. On the other hand, although not shown in the illustration, when the tread member 14 is configured to cover both the tire outer circumference side surface of the outer cylinder portion 12 of the case body 16 and at least a portion of the outer surfaces (side surfaces) on both sides in the tire width direction WD, the adhesive layer 5 may be located on both the tire outer circumference side surface of the outer cylinder portion 12 and at least a portion of the outer surfaces (side surfaces) on both sides in the tire width direction WD. 【0026】The conductive path member 4 is conductive. One or more conductive path members 4 may be provided. When multiple conductive path members 4 are provided, unless otherwise specified, the configuration of the conductive path member 4 described herein can be applied to each conductive path member 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, for example, an 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 a polyurethane resin, a polyester resin, or an acrylic resin. The ink that can constitute the conductive path member 4 may 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. 【0027】 As shown in the embodiments in Figures 3 and 4, the conductive path member 4 extends on the surface (not inside) of the case body 16. Preferably, the conductive path member 4 is coated or attached to the surface of the case body 16 so as to maintain contact with the surface of the case body 16. By providing the conductive path member 4 on the surface of the case body 16, electrical resistance can be reduced, and static electricity generated in the case body 16 during operation can be easily discharged. 【0028】 The conductive path member 4 has a first portion 4b that is positioned in contact with the adhesive layer 5. That is, in the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3), the first portion 4b is in contact with the adhesive layer 5. This facilitates the flow of electricity between the conductive path member 4 and the conductive adhesive layer 5. As shown in the embodiments in Figures 3 and 4, the first portion 4b may be either one of the two ends of the conductive path member 4 in the extending direction. 【0029】Next, a method for manufacturing a non-pneumatic tire 1 and a tire-wheel assembly 3 according to each of the above-described embodiments will be explained. The tire-wheel assembly manufacturing method according to each embodiment of the present invention can be suitably used to manufacture a tire-wheel assembly 3 according to any embodiment of the present invention. The tire-wheel assembly manufacturing method according to each embodiment of the present invention includes a non-pneumatic tire manufacturing step and a wheel assembly step. In the non-pneumatic tire manufacturing step, a non-pneumatic tire 1 according to any one embodiment of the present invention is manufactured by the non-pneumatic tire manufacturing method according to any one embodiment of the present invention. In the wheel assembly step, the wheel 2 is assembled to the inner cylinder portion 11 of the non-pneumatic tire 1 manufactured in the non-pneumatic tire manufacturing step. This results in a tire-wheel assembly 3 according to any embodiment of the present invention (Figures 3(b) and 4(b)). Figures 3(b) and 4(b) show the state in which the tire-wheel assembly 3 is completed by the tire-wheel assembly manufacturing method in the first and second embodiments, respectively. 【0030】 Here, we will describe in more detail the non-pneumatic tire manufacturing methods according to various embodiments of the present invention, which are performed in the non-pneumatic tire manufacturing step. 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 non-pneumatic tire manufacturing methods according to each embodiment of the present invention include a case body manufacturing step, a conductive path member application step, and a tread member assembly step. 【0031】 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. 【0032】In the conductive path member application step, the conductive path member 4 is applied (coated, attached, etc.) to the surface of the case body 16 obtained in the case body manufacturing step (Figures 3(a) and 4(a)). Figures 3(a) and 4(a) show the state immediately after the conductive path member application step is completed in the first and second embodiments, respectively. In the conductive path member application step, the conductive path member 4 is applied to the surface of the case body 16 such that it has a first part 4b that is positioned to be in contact with the adhesive layer 5 that will be provided later (Figures 3(b) and 4(b)). That is, the first part 4b is pre-positioned to be in contact with the adhesive layer 5 at the position where the adhesive layer 5 will be placed later. For example, the first part 4b may be positioned on the tire outer circumference side surface of the outer cylinder portion 12 of the case body 16, as in the embodiments of Figures 3 and 4. More specifically, for example, the first Part 4b may be positioned on the outer WO in the tire width direction of the outer cylindrical portion 12 of the case body 16, as shown in the embodiments of Figures 3 and 4. And / or, although not shown, if the adhesive layer 5 and tread member 14 provided thereafter cover both the outer cylindrical portion 12 of the case body 16 and at least a portion of the outer cylindrical portion 12 of the case body 16 and the outer WO surfaces (side surfaces) on both sides in the tire width direction, then Part 1 4b may be positioned on the outer WO surfaces (side surfaces) of the outer cylindrical portion 12 of the case body 16. 【0033】 Following the conductive path member application step, in the tread member assembly step, the tread member 14 is assembled to the tire outer circumference side of the case body 16 via the adhesive layer 5. In the tread member assembly step, the adhesive layer 5 is positioned so that the first part 4b of the conductive path member 4 and the adhesive layer 5 are in contact. This facilitates the flow of electricity between the conductive path member 4 and the conductive adhesive layer 5. If the tread member 14 has a tread conductive portion 14c, in the tread member assembly step, the adhesive layer 5 is positioned so that the adhesive layer 5 and the tread conductive portion 14c are in contact. This facilitates the flow of electricity between the adhesive layer 5 and the tread conductive portion 14c. Thus, a non-pneumatic tire 1 according to any embodiment of the present invention can be obtained. 【0034】As described above, according to each embodiment of the present invention, the conductive path member 4, which has conductivity, extends on the surface of the resin case body 16 and has a first portion 4b that is arranged to be in contact with the conductive adhesive layer 5. As a result, while a vehicle to which the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3) is attached is running, static electricity generated in the case body 16 passes through the conductive path member 4 extending on the surface of the case body 16, is transmitted to the conductive adhesive layer 5, and from there can be discharged, for example, through the tread conductive portion 14c of the tread member 14 to the road surface. In this way, it is possible to reduce the electrical resistance of the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3) and suppress static charge buildup while running. There is a demand in the industry for suppressing static charge buildup, and this invention can meet such demands. Furthermore, since the conductive path member 4 is not provided inside the case body 16 but on the surface of the case body 16, the risk of affecting the strength and performance of the case body 16 itself can be avoided. Furthermore, since the conductive path member 4 is provided to extend on the surface of the case body 16 and to have a first portion 4b that is positioned in contact with the conductive adhesive layer 5, the process of applying the conductive path member 4 (conductive path member application step) can be performed after the manufacturing of the case body 16 (after the case body manufacturing step) and before the adhesive layer 5 and tread member 14 are assembled (before the tread member assembly step). This improves manufacturing efficiency compared to, for example, performing the process of applying the conductive path member 4 (conductive path member application step) after the completion of the non-pneumatic tire 1. 【0035】In each example described herein, it is preferable that the conductive path member 4 has a second portion 4d made of metal or the like and arranged to contact the conductive wheel 2. That is, in the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3), the second portion 4d is in contact with the wheel 2. In this case, in the conductive path member application step described above, the conductive path member 4 is applied to the surface of the case body 16 such that it has a second portion 4d arranged to contact the wheel 2 that will be assembled in the subsequent wheel assembly step. That is, the second portion 4d is pre-positioned to contact the wheel 2 at the position where the wheel 2 will be placed later. For example, the second portion 4d may be positioned on the outer surface (side surface) WO in the tire width direction of the inner cylinder portion 11 of the case body 16, as in the embodiments of Figures 3 and 4, and / or on the inner circumference side surface of the inner cylinder portion 11. 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 3 and 4, the second part 4d may be either one of the two ends of the conductive path member 4 in its extending direction. 【0036】 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 case body 16. 【0037】For example, 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 embodiment of Figure 3. 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 1 to 3, 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, the conductive path member 4 may, as in the embodiment of Figure 3, extend further over the inner circumferential side of the tire of the outer cylinder portion 12 of the case body 16, and further extend over the outer side WO of the tire width direction of the outer cylinder portion 12, to reach the first portion 4b (and consequently, the adhesive layer 5). In this case, as shown in the embodiment of Figure 3, the conductive path member 4 may extend from the portion of the case body 16 that extends over the surface on one side CD in the tire circumferential direction of the connecting portion 13, to the surface of the inner cylinder portion 11 of the case body 16 that is on the outer side of the tire, and further to the outer surface (side surface) of the inner cylinder portion 11 that is on the outer side WO in the tire width direction, until it reaches the second portion 4d (and thus the wheel 2). 【0038】And / or, in each example described herein, the conductive path member 4 may extend over the outer surface (side surface) of the connecting portion 13 of the case body 16 in the tire width direction WO, as in the embodiment of Figure 4. 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 1 to 2 and Figure 4, the conductive path member 4 may extend over the outer surface (side surface) of at least one spoke portion 13s in the tire width direction WO. In this case, the conductive path member 4 may, as in the embodiment of Figure 4, extend further over the outer surface (side surface) of the outer cylindrical portion 12 of the case body 16 in the tire width direction WO, following the portion extending over the outer surface (side surface) of the connecting portion 13 of the case body 16 in the tire width direction WO, to the first portion 4b (and thus the adhesive layer 5). In this case, as shown in the embodiment of Figure 4, the conductive path member 4 may extend from the portion extending over the outer surface WO in the tire width direction of the connecting portion 13 of the case body 16, to the outer surface (side surface) of the inner cylindrical portion 11 of the case body 16, also in the tire width direction, to the second portion 4d (and thus to the wheel 2). 【0039】 The non-pneumatic tire and the tire-wheel assembly according to the present invention can be mounted and used on any type of vehicle, and are particularly suitable for use on, for example, bicycles, motorcycles, automobiles including light vehicles, and electric wheelchairs with handlebars. 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. 【0040】1: Non-pneumatic tire, 16: Case body, 11: Inner cylinder part, 12: Outer cylinder part, 13: Connecting part, 13s: Spoke part, 14: Tread member, 14f: Tread tread surface, 14c: Tread conductive part, 14g: Groove, 2: Wheel, 3: Tire / wheel assembly, 4: Conductive path member, 4b: First part, 4d: Second part, 5: Adhesive layer, CD: Tire circumferential direction, RD: Tire radial direction, RDI: Inner side in tire radial direction, RDO: Outer side in tire radial direction, WD: Tire width direction, WI: Inner side in tire width direction, WO: Outer side in tire width direction, O: Center axis
Claims
1. A non-pneumatic tire comprising: a resin case body; a tread member disposed on the outer circumference side of the case body; an adhesive layer that bonds the case body and the tread member together and is conductive; and a conductive path member that is conductive, wherein the case body has an inner cylinder portion; an outer cylinder portion disposed on the outer circumference side of the inner cylinder portion; and a connecting portion that connects the inner cylinder portion and the outer cylinder portion to each other; the conductive path member extends on the surface of the case body; and the conductive path member has a first portion that is in contact with the adhesive layer.
2. 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.
3. The non-pneumatic tire according to claim 2, wherein 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, and the conductive path member extends over one side of the circumferential direction of the tire of at least one of the spokes.
4. The non-pneumatic tire according to claim 3, wherein the conductive path member further extends over the inner circumferential surface of the tire and the outer surface in the width direction of the tire, respectively.
5. 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.
6. 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.
7. The non-pneumatic tire according to claim 1, wherein the tread member has a conductive tread portion that extends between the adhesive layer and the tread surface of the tread member and is electrically conductive.
8. A tire-wheel assembly comprising a non-pneumatic tire according to any one of claims 1 to 7, and a wheel assembled to the inner cylinder portion.
9. A method for manufacturing a non-pneumatic tire according to any one of claims 1 to 7, comprising: a case body manufacturing step of manufacturing the case body; a conductive path member application step of applying the conductive path member to the surface of the case body obtained by the case body manufacturing step; and a tread member assembly step of assembling the tread member to the tire outer circumference side of the case body via the adhesive layer after the conductive path member application step.
10. A method for manufacturing a tire and wheel assembly, comprising: a non-pneumatic tire manufacturing step of manufacturing a non-pneumatic tire by the non-pneumatic tire manufacturing method described in claim 9; and a wheel assembly step of assembling a wheel onto the inner cylinder portion of the non-pneumatic tire.