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 case body 16 and a tread member 14 arranged on the outer circumference side of the case body 16, wherein the tread member 14 has a tread conductive portion 14c made of conductive rubber, and the tread conductive portion 14c has a first portion 14cb located within the tread tread surface 14f of the tread member 14.

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 assembly. 【Background Art】 【0002】 Conventionally, there has been a non-pneumatic tire provided with a tread member made of rubber or the like (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 case body; a tread member disposed on the outer peripheral side of the tire of the case body; and the tread member has a tread conductive portion made of conductive rubber, and the tread conductive portion has a first portion located within the tread surface of the tread member. 【0007】 [2] The non-pneumatic tire according to [1], wherein the tread conductive portion further comprises a second portion which constitutes a part of the non-pneumatic tire and is arranged in contact with a conductive tire component conductive member having conductivity. 【0008】 [3] Further comprising a conductive path member having conductivity, The conductive path member extends along the surface of the case body, The non-pneumatic tire according to [2], wherein the tire component conductive member is the conductive path member. 【0009】 [4] Further comprising an adhesive layer for bonding the case body and the tread member together, The adhesive layer has conductivity, The non-pneumatic tire according to [2], wherein the tire component conductive member is the adhesive layer. 【0010】 [5] The non-pneumatic tire according to any one of [1] to [4], wherein the tread member further comprises a tread body made of rubber or thermoplastic material having lower conductivity than the tread conductive portion. 【0011】 [6] The non-pneumatic tire according to [5], wherein the tread body portion does not have a portion configured to be located between the case body and the tread conductive portion. 【0012】 [7] The non-pneumatic tire according to [5], wherein the tread body portion has a portion configured to be located between the case body and the tread conductive portion. 【0013】 [8] The non-pneumatic tire according to any one of [1] to [4], wherein the tread member consists only of the tread conductive portion. 【0014】 [9] Multiple first parts are arranged apart from each other in the circumferential direction of the tire, The non-pneumatic tire according to any one of [1] to [8], wherein the circumferential interval in the tire circumferential direction between the plurality of first portions spaced apart from each other in the tire circumferential direction is not more than the contact length. 【0015】 〔10〕A non-pneumatic tire according to any one of [1] to [9], and a wheel assembled to the case body, A tire-wheel assembly comprising the same. 【0016】 〔11〕A non-pneumatic tire manufacturing method for manufacturing a non-pneumatic tire according to any one of [1] to [9], comprising: a case body manufacturing step of manufacturing the case body, a tread member manufacturing step of manufacturing the tread member, a tread member assembling step of assembling the tread member obtained by the tread member manufacturing step to the outer peripheral side of the tire of the case body obtained by the case body manufacturing step, A non-pneumatic tire manufacturing method including the same. 【0017】 〔12〕A tire-wheel assembly manufacturing method for manufacturing a tire-wheel assembly, comprising: a non-pneumatic tire manufacturing step of manufacturing the non-pneumatic tire by the non-pneumatic tire manufacturing method according to

[11] , a wheel assembling step of assembling a wheel to the case body of the non-pneumatic tire, A tire-wheel assembly manufacturing method including the same. 【Advantages of the Invention】 【0018】 According to the present invention, it is possible to provide a non-pneumatic tire, a tire-wheel assembly, a non-pneumatic tire manufacturing method, and a tire-wheel assembly manufacturing method capable of reducing electrical resistance. 【Brief Description of the Drawings】 【0019】 [Figure 1]This is a schematic side view showing a tire-wheel assembly according to any embodiment of the present invention, which includes a non-pneumatic tire according to any embodiment of the present invention, viewed from one side in the tire width direction. [Figure 2] Figure 1 is a schematic perspective view showing the tire and wheel assembly. [Figure 3] This is a schematic side view of part A of a non-pneumatic tire and tire-wheel assembly according to any embodiment of the present invention, corresponding to part A in Figure 1. [Figure 4] This is a very schematic cross-sectional view of the BB line in Figure 3, corresponding to the cross-section of the non-pneumatic tire and tire-wheel assembly according to the first embodiment of the present invention. [Figure 5] This is a very schematic cross-sectional view of the BB line in Figure 3, corresponding to the cross-section of the non-pneumatic tire and tire-wheel assembly according to the second embodiment of the present invention. [Figure 6] This is a very schematic cross-sectional view of the BB line in Figure 3, corresponding to the cross-section of the non-pneumatic tire and tire-wheel assembly according to the third embodiment of the present invention. [Figure 7] This is a very schematic cross-sectional view of the BB line in Figure 3, corresponding to the cross-section of the non-pneumatic tire and tire-wheel assembly according to the fourth embodiment of the present invention. [Figure 8] This is a very schematic cross-sectional view of the BB line in Figure 3, corresponding to the cross-section of the non-pneumatic tire and tire-wheel assembly according to the fifth embodiment of the present invention. [Figure 9] This is a very schematic cross-sectional view of the BB line in Figure 3, corresponding to the cross-section of the non-pneumatic tire and tire-wheel assembly according to the sixth embodiment of the present invention. [Figure 10] This is a very schematic cross-sectional view of the non-pneumatic tire and tire-wheel assembly according to the seventh embodiment of the present invention, showing a cross-section corresponding to the cross-section along the BB line in Figure 3. [Figure 11]This is a very schematic cross-sectional view of the BB line in Figure 3, corresponding to the cross-section of the non-pneumatic tire and tire-wheel assembly according to the eighth embodiment of the present invention. [Modes for carrying out the invention] 【0020】 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. 【0021】 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. 【0022】 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 (generally also referred to as the "tire equatorial plane CL") is referred to as the "inner side WI in 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 in 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 in the tire radial direction" or the "inner circumference side," and the side of the tire radial direction RD further away from the central axis O is referred to as the "outer side RDO in the tire radial direction" or the "outer circumference side." In each figure, these directions are shown with arrows for reference. Furthermore, in this specification, the virtual plane perpendicular to the axis located at the center WD in the tire width direction of the non-pneumatic tire 1 (and by extension, the tire-wheel assembly 3) is referred to as the "tire equatorial plane CL". 【0023】 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 side view of part A of the non-pneumatic tire 1 and tire-wheel assembly 3 according to any embodiment of the present invention, showing the part corresponding to part A in Figure 1 in a grounded state. Figures 4 to 11 are BB cross-sectional views, respectively, that schematically show the cross-sections of the non-pneumatic tire 1 and tire-wheel assembly 3 according to the first to eighth embodiments of the present invention, corresponding to the cross-section along the BB line in Figure 3. Note that in Figures 4 to 11, the non-pneumatic tire 1 and tire-wheel assembly 3 are in a natural state, not touching the ground, as in Figures 1 and 2. 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. 【0024】 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. 【0025】 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. 【0026】 As shown in Figures 1 to 11, in each embodiment of the present invention, the non-pneumatic tire 1 comprises a case body 16 and a tread member 14. As in each embodiment of Figures 4 to 11, the non-pneumatic tire 1 may further comprise an adhesive layer 5 and / or a conductive path member 4. In Figures 1 and 2, the adhesive layer 5 and the conductive path member 4 are not shown. 【0027】 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. 【0028】 The case body 16 is preferably 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. If 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. 【0029】 In each of the illustrated embodiments, as shown in Figures 1 to 3, 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. 【0030】 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 G. The tread tread surface 14f may be provided with one or more grooves 14g. The tread member 14 may be configured to cover both the outer surface of the tire on the outer circumference 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, as shown in the embodiments illustrated in Figures 4 to 11, or, although not shown, it may be configured to cover only the outer surface of the tire on the outer circumference side of the outer cylinder portion 12 of the case body 16. 【0031】 In this specification, the outer ends of the tire width direction WD on the tread surface 14f are referred to as "tread ends TE" (Figures 4 to 11), respectively. 【0032】 As shown in the examples in Figures 4 to 11, the tread surface 14f may have a pair of grooves 14g extending in the tire circumferential direction CD on both sides of the tire equatorial plane CL. In this case, the tread surface 14f may have a pair of side land portions 14s (land portions) partitioned between the pair of grooves 14g and the pair of tread ends TE, and a center land portion 14r (land portion) partitioned between the pair of grooves 14g. However, the tread surface 14f may have an arbitrary tread pattern formed by one or more grooves 14g, etc. 【0033】 In each embodiment of the present invention, the tread member 14 has a tread conductive portion 14c (Figures 3 to 11). One or more tread conductive portions 14c may be provided. If multiple tread conductive portions 14c are provided, unless otherwise specified, the configurations of the tread conductive portions 14c described herein may be applied to each of the tread conductive portions 14c. The configurations of each tread conductive portion 14c may be the same or different. The tread conductive portion 14c is conductive. The tread conductive portion 14c is made of conductive rubber. Examples of rubber constituting the tread conductive portion 14c include rubber containing 50 parts by mass or more of carbon black (for example, diene-based rubber). The tread conductive portion 14c has one or more first portions 14cb located within the tread surface 14f of the tread member 14 (Figures 3 to 11). The first portions 14cb are located within the portion of the tread surface 14f other than the groove 14g (land portion (center land portion 14r, side land portion 14s, etc.)) and are arranged to be in contact with the road surface G. Preferably, the tread conductive portion 14c also has a portion located on a surface of the tread member 14 other than the tread tread surface 14f (for example, the inner circumference side of the tire and / or the inner side WI in the tire width direction), and thus extends from the surface of the tread member 14 other than the tread tread surface 14f to the tread tread surface 14f. The tread conductive portion 14c may constitute any part of the tread member 14. 【0034】 According to each embodiment of the present invention, as described above, the tread member 14 has a tread conductive portion 14c made of conductive rubber, and the tread conductive portion 14c has a first portion 14cb located within the tread tread surface 14f of the tread member 14. This makes it easier for electricity to flow within the tread member 14, further reducing electrical resistance and making it easier to discharge static electricity generated during driving from the first portion 14cb within the tread tread surface 14f to the road surface G. In this way, it is possible to reduce the electrical resistance of the non-pneumatic tire 1 (and by extension, the tire-wheel assembly 3) and suppress static charge buildup during driving. There is a demand in the industry for suppressing static charge buildup, and this invention can meet that demand. 【0035】 The tread conductive portion 14c may constitute only a part of the tread member 14, as shown in the embodiments of Figures 4 to 9 and Figure 11. In this case, the tread member 14 further has a tread main body portion 14m. That is, in this case, the tread member 14 consists of the tread conductive portion 14c and the tread main body portion 14m. The tread main body portion 14m has lower conductivity than the tread conductive portion 14c. Therefore, the tread main body portion 14m has relatively high electrical resistance and tends to become charged while the vehicle is running. One or more tread body sections 14m may be provided. If multiple tread body sections 14m are provided, unless otherwise specified, the configuration of the tread body sections 14m described herein may be applied to each of the tread body sections 14m. The configurations of each tread body section 14m may be the same or different. The tread body portion 14m may or may not be conductive. The tread body 14m 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 body 14m 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 body 14m include urethane resin, olefin resin, vinyl chloride resin, or polyamide resin. The tread body 14m may contain less than 50 parts by mass of carbon black, or it may not contain carbon black at all. The tread body portion 14m tends to provide better tire performance (tire driving performance, etc.) than the tread conductive portion 14c. Therefore, when the tread conductive portion 14c constitutes only a part of the tread member 14, and consequently when the tread member 14 has both the tread conductive portion 14c and the tread body portion 14m, it is possible to obtain the electrical resistance reduction effect of the tread conductive portion 14c while suppressing the deterioration of tire performance with the tread body portion 14m. It is preferable that one or more tread conductive parts 14c and one or more tread body parts 14m are formed integrally with each other, and consequently, it is preferable that the tread member 14 as a whole is formed integrally and consists of one part. 【0036】 Alternatively, the tread conductive portion 14c may constitute the entirety of the tread member 14, as shown in the embodiment of Figure 10. That is, the tread member 14 may consist only of the tread conductive portion 14c. In this case, the entire tread surface 14f of the tread member 14 will be composed of the first portion 14cb of the tread conductive portion 14c. In this case, electrical resistance can be further reduced, and the area and probability of the tread conductive part 14c (specifically, the first part 14cb) in contact with the road surface G during driving increases, making it easier to discharge static electricity to the road surface G. 【0037】 As shown in the embodiments of Figures 4 to 11, the non-pneumatic tire 1 may include an adhesive layer 5. The adhesive layer 5 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 the embodiments of Figures 4 to 11, when the tread member 14 is configured to cover both the outer surface of the tire on the outer circumference 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, the adhesive layer 5 may be located on both the outer surface of the tire on the outer circumference of the outer cylinder portion 12 and at least a portion of the outer surfaces (sides) on both sides in the tire width direction WD. On the other hand, although not shown, when the tread member 14 is configured to cover only the outer surface of the tire on the outer circumference of the outer cylinder portion 12 of the case body 16, the adhesive layer 5 may be located only on the outer surface of the tire on the outer circumference of the outer cylinder portion 12. 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 conductive, the adhesive constituting the adhesive layer 5 may be, for example, a urethane-based adhesive. If the adhesive layer 5 is not conductive, it has high electrical resistance and therefore tends to become charged while the vehicle is running. 【0038】 The adhesive layer 5 may be omitted. In this case, the case body 16 (specifically, the outer cylinder portion 12) and the tread member 14 may be in direct contact (without any intervening member), or they may be in contact with each other via a member other than the adhesive layer 5. 【0039】 As shown in the embodiments of Figures 4 to 11, the non-pneumatic tire 1 may include a conductive path member 4. The conductive path member 4 is electrically conductive. One or more conductive path members 4 may be provided. If multiple conductive path members 4 are provided, unless otherwise specified, the configurations of the conductive path members 4 described herein can 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. 【0040】 As shown in the embodiments in Figures 4 to 11, it is preferable that the conductive path member 4 extends on the surface (not inside) of the case body 16 in at least a portion of the conductive path member 4. The conductive path member 4 does not have to be provided inside the case body 16. As in each embodiment, 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 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. Furthermore, if the conductive path member 4 extends on the surface (not inside) of the case body 16 in at least a portion of the case, the influence of the conductive path member 4 on the strength and performance of the case body 16 can be suppressed compared to the case where the conductive path member 4 extends inside the case body 16. 【0041】 The conductive path member 4 may extend in any form on any portion of the surface of the case body 16. From the viewpoint of the strength and performance of the connecting portion 13 of the case body 16, it is preferable that the conductive path member 4 extends on the surface (not inside) of the connecting portion 13 of the case body 16. It is preferable that the conductive path member 4 is not provided inside the connecting portion 13. 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 shown in the embodiments of Figures 3 to 11. For example, if the connecting portion 13 of the case body 16 has a plurality of spoke portions 13s, as shown in the embodiments of Figures 3 to 11, 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. And / or, 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, although this is not shown in the illustration. For example, if the connecting portion 13 of the case body 16 has a plurality of spoke portions 13s, the conductive path member 4 may extend over either one side of the tire circumferential CD of at least one of the spoke portions 13s. 【0042】 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 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 embodiment of the present invention. The tire-wheel assembly manufacturing methods according to each embodiment of the present invention include 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 a 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 case body 16 (specifically, the inner cylinder portion 11) of the non-pneumatic tire 1 manufactured in the non-pneumatic tire manufacturing step. This yields a tire-wheel assembly 3 according to any embodiment of the present invention (Figures 3 to 11). 【0043】 Here, we will describe in more detail the non-pneumatic tire manufacturing method according to various embodiments of the present invention, which is performed in the non-pneumatic tire manufacturing step. Each embodiment of the present invention provides for the manufacture of a non-pneumatic tire, which can be suitably used to manufacture a non-pneumatic tire 1 according to any one embodiment of the present invention. Each embodiment of the present invention provides for the manufacture of a non-pneumatic tire, which includes a case body manufacturing step, a tread member manufacturing step, and a tread member assembly step. 【0044】 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. 【0045】 Furthermore, in the tread member manufacturing step, the tread member 14 is manufactured. The tread member 14 is cured. Here, "curing" refers to vulcanization when the member to be cured is made of rubber. The tread member 14 may be manufactured, for example, by forming an uncured tread member 14 and then curing the uncured tread member 14. The uncured tread member 14 may be formed, for example, by extrusion molding, or by laminating sheet-like members together. 【0046】 Following the case body manufacturing step and the tread member manufacturing step, in the tread member assembly step, the tread member 14 obtained in the tread member manufacturing step is assembled to the outer circumference of the case body 16 obtained in the case body manufacturing step. This results in a non-pneumatic tire 1. In this case, an adhesive layer 5 (Figures 3 to 11) may be provided between the case body 16 and the tread member 14. 【0047】 In the wheel assembly step, the wheel 2 is assembled onto the inner cylinder portion 11 of the case body 16 of the non-pneumatic tire 1. This results in a tire-wheel assembly 3. 【0048】 The method for manufacturing a non-pneumatic tire and the method for manufacturing a tire-wheel assembly may further include a step of providing a conductive path member. The step of applying the conductive path member is performed after the case body manufacturing step. The step of applying the conductive path member may be performed before the tread member assembly step, or after the tread member assembly step. Alternatively, 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 as described above. 【0049】 In each example described herein, it is preferable that the tread conductive portion 14c further comprises a second portion 14cd arranged in contact with the tire conductive member 6, as in the embodiments shown in Figures 4 to 11. The tire component conductive member 6 is a component that constitutes part of the non-pneumatic tire 1 and has conductivity. Examples of the tire component conductive member 6 that is in contact with the second part 14cd of the tread conductive portion 14c include a conductive path member 4 or an adhesive layer 5 (which has conductivity). In each embodiment shown in Figures 4 to 10, the tire component conductive member 6 that contacts the second portion 14cd of the tread conductive portion 14c is a conductive path member 4. When the tire component conductive member 6 that contacts the second portion 14cd of the tread conductive portion 14c is a conductive path member 4, the adhesive layer 5 may or may not be conductive. In the embodiment shown in Figure 11, the tire component conductive member 6 that contacts the second portion 14cd of the tread conductive portion 14c is an adhesive layer 5. In this case, the adhesive layer 5 is conductive. However, in each embodiment of Figures 4 to 11, the tire component conductive member 6 that contacts the second part 14cd of the tread conductive portion 14c may be a conductive path member 4 or an adhesive layer 5 (which has conductivity). The tread conductive portion 14c has a second portion 14cd that is positioned in contact with the tire component conductive member 6, which facilitates the flow of electricity between the conductive tire component conductive member 6 and the tread conductive portion 14c. This further reduces the electrical resistance of the non-pneumatic tire 1 (and consequently the tire-wheel assembly 3), and further suppresses static charge buildup during driving. Furthermore, as shown in the embodiment in Figure 11, if the tire component conductive member 6 that contacts the second part 14cd of the tread conductive portion 14c is a (conductive) adhesive layer 5, it is preferable that the conductive path member 4 is in contact with the adhesive layer 5. This facilitates the flow of electricity between the conductive path member 4 and the tread conductive portion 14c via the adhesive layer 5. 【0050】 In each example described herein, it is preferable that the conductive path member 4 is in contact with the conductive wheel 2, which is made of metal or the like, as in the embodiments shown in Figures 4 to 11. This facilitates the flow of electricity between the conductive path member 4 and the conductive wheel 2, thereby further reducing electrical resistance and further suppressing static charge buildup during driving. 【0051】 In each example described herein, the tread surface 14f is preferably composed of one or more first parts 14cb of the tread conductive part 14c and the tread body part 14m, as shown in the embodiments of Figures 4 to 9 and Figure 11. In this case, compared to the embodiment shown in Figure 10, for example, where the entire tread surface 14f is composed of the first part 14cb of the tread conductive part 14c, the area of ​​the first part 14cb (and thus the tread conductive part 14c) within the tread surface 14f can be reduced, and the area of ​​the tread body part 14m, which has superior tire performance, can be increased within that portion, the tread surface 14f. Thus, while obtaining the effect of reducing electrical resistance by the tread conductive part 14c, tire performance can be improved. In each example described herein, it is preferable that the first portion 14cb of the tread conductive portion 14c is point-shaped, as in the embodiments shown in Figures 3 to 9 and Figure 11. However, in each example described herein, the first portion 14cb of the tread conductive portion 14c may be linear or planar, as in the embodiment of Figure 10. For example, the area of ​​one 14cb section is 10mm². 2 Preferably, the following: 5 mm 2 The following is more preferable. 【0052】 In each example described herein, as in the embodiments shown in Figures 4 to 6 and Figures 8 to 11, at least one first portion 14cb of the tread conductive portion 14c may be located within the center land portion 14r, or for example, on the tire equatorial plane CL. In this case, the probability of the first portion 14cb (and thus the tread conductive portion 14c) coming into contact with the road surface G increases during driving, making it easier to discharge static electricity to the road surface G. 【0053】 In each example described herein, as in the embodiment of Figure 7, none of the first parts 14cb of the tread conductive portion 14c are located within the center land area 14r; for example, all of the first parts 14cb may be located within the side land areas 14s. In this case, one or more of the first parts 14cb of the tread conductive portion 14c may be located within only one of the side land areas 14s, as in the embodiment of Figure 7, or they may be located within a pair of side land areas 14s. 【0054】 In each example described herein, as in the embodiments shown in Figures 7 and 10, one or more first portions 14cb of the tread conductive portion 14c may be located both within the center land area 14r and within the side land area 14s. 【0055】 In each example described herein, one or more first parts 14cb of the tread conductive portion 14c may be located on both sides of the tire equatorial plane CL, as in the embodiments of Figures 4 to 6 and Figures 8 to 11, or they may be located on only one side of the tire equatorial plane CL, as in the embodiment of Figure 7. 【0056】 In each example described herein, it is preferable that the non-pneumatic tire 1 is configured such that, as illustrated in Figure 3, at least one first portion 14cb is always located within the contact surface 14t during driving. This increases the probability that the first portion 14cb (and thus the tread conductive portion 14c) comes into contact with the road surface G during driving, thereby facilitating further discharge of static electricity to the road surface G. Here, "contact surface 14t" refers to the area of ​​the tread surface 14f that is in contact with the road surface G when a load is applied. From a similar viewpoint, as illustrated in Figure 3, when a plurality of first parts 14cb are arranged spaced apart from each other in the tire circumferential direction CD, it is preferable that the distance between the plurality of first parts 14cb that are spaced apart from each other in the tire circumferential direction CD is less than or equal to the contact length, and more preferably less than the contact length. Here, "contact length" refers to the total length of the contact surface 14t in the tire's circumferential direction CD. These multiple first parts 14cb may each constitute a separate part of the tread conductive part 14c, or they may each constitute a part of the same tread conductive part 14c. 【0057】 In each example described herein, if the tread member 14 includes a tread body portion 14m, the tread body portion 14m does not have to have a portion configured to be located between the case body 16 and the tread conductive portion 14c, as in the embodiments of Figures 4 to 8 and Figure 11. In this case, the tread conductive portion 14c constitutes at least a portion of the surface of the tread member 14 that faces the case body 16. Here, the "surface of the tread member 14 facing the case body 16" is not limited to cases where it is in direct contact with the case body 16, but also includes cases where other members such as an adhesive layer 5 are placed between it and the case body 16, as in the embodiments shown in Figures 4 to 11. As shown in the embodiments in Figures 4 to 11, when the tread member 14 is 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, the "surface facing the case body 16" of the surface of the tread member 14 is specifically the inner surface of the tire on the inner side of the tread member 14 and the inner surfaces on both sides in the tire width direction WD. On the other hand, although not shown in the figures, when the tread member 14 is 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, the "surface facing the case body 16" of the surface of the tread member 14 is specifically the inner surface of the tire on the tread member 14. In the embodiments shown in Figures 4, 7, 8, and 11, the tread conductive portion 14c constitutes the entire surface of the tread member 14 that faces the case body 16. In the embodiments shown in Figures 5 and 6, the tread conductive portion 14c constitutes only a part of the surface of the tread member 14 that faces the case body 16, and the remaining part of the surface of the tread member 14 that faces the case body 16 is composed of the tread main body portion 14m. In the embodiment shown in Figure 5, the tread conductive portion 14c constitutes the inner surface WI in the tire width direction on one side WD in the tire width direction of the tread member 14 and the inner circumference side surface of the tread member 14, and the tread main body portion 14m constitutes the inner surface WI in the tire width direction on the other side WD in the tire width direction of the tread member 14, among the surfaces of the tread member 14 that face the case body 16. In the embodiment shown in Figure 6, the tread conductive portion 14c constitutes the portion of the tread member 14 facing the case body 16 on one side in the tire width direction WD, and the tread main body portion 14m constitutes the portion of the tread member 14 facing the case body 16 on the other side in the tire width direction WD from the tread conductive portion 14c. Furthermore, the tread body portion 14m may have better adhesion to the case body 16 than the tread conductive portion 14c. In such cases, as shown in the embodiments of Figures 5 and 6, if at least a portion of the surface of the tread member 14 that faces the case body 16 is composed of the tread body portion 14m, the adhesion between the case body 16 and the tread member 14 can be improved. 【0058】 In each example described herein, when the tread member 14 includes a tread body portion 14m, when viewing a cross-section in the tire width direction WD, there may be only one first portion 14cb, as in the embodiments of Figures 4-7, 9, and 11, or there may be multiple first portions 14cb, as in the embodiment of Figure 8 (i.e., multiple first portions 14cb may be arranged spaced apart from each other along the tire width direction WD). In the latter case, the probability of the first portion 14cb (and thus the tread conductive portion 14c) coming into contact with the road surface G increases during driving, making it easier to discharge static electricity to the road surface G. These multiple first portions 14cb may constitute a part of the same tread conductive portion 14c, or they may each constitute a part of a separate tread conductive portion 14c. 【0059】 In each example described herein, the tread body portion 14m may have a portion configured to be located between the case body 16 and the tread conductive portion 14c, as in the embodiment of Figure 9. In this case, the tread conductive portion 14c may extend mostly inside the tread member 14, as in the embodiment of Figure 9. In this case, a portion (most in the embodiment of Figure 9) of the surface of the tread member 14 facing the case body 16 may be composed of the tread body portion 14m, and the remaining portion of the surface of the tread member 14 facing the case body 16 may be composed of the tread conductive portion 14c. 【0060】 [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] 【0061】 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] 【0062】 1: Non-pneumatic tires 16: Case 11: Inner cylinder 12: Outer cylinder 13:Connection part 13s: Spoke section 14: Tread component 14f: Tread surface 14t: Ground plane 14c: Tread conductive part 14cb: Part 1 14cd: Part 2 14g: Groove 14m: Tread main body 14r: Center Track and Field Club (Track and Field Club) 14s: Side Track and Field Club (Track and Field Club) CL: Tire equatorial plane TE: Tread edge 2: Wheels 3: Tire and wheel assembly 4: Conductive path member 5: Adhesive layer 6: Conductive components of the tire CD: Tire circumferential direction RD: Tire radial direction RDI: Inner diameter direction of tire RDO: Outer diameter 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 G: Road surface

Claims

[Claim 1] Non-pneumatic tires, The case body, A tread member is arranged on the outer circumference side of the tire of the aforementioned case body, Equipped with, The tread member has a tread conductive portion made of conductive rubber. The tread conductive portion has a first portion located within the tread surface of the tread member, in a non-pneumatic tire. [Claim 2] The non-pneumatic tire according to claim 1, wherein the tread conductive portion further comprises a second portion which constitutes a part of the non-pneumatic tire and is arranged in contact with a conductive tire component conductive member having conductivity. [Claim 3] It further comprises a conductive path member having electrical conductivity, The conductive path member extends along the surface of the case body, The non-pneumatic tire according to claim 2, wherein the conductive member of the tire structure is the conductive path member. [Claim 4] The system further comprises an adhesive layer for bonding the case body and the tread member together. The adhesive layer has conductivity, The non-pneumatic tire according to claim 2, wherein the tire component conductive member is the adhesive layer. [Claim 5] The non-pneumatic tire according to claim 1, wherein the tread member further comprises a tread body made of rubber or thermoplastic material having lower conductivity than the tread conductive portion. [Claim 6] The non-pneumatic tire according to claim 5, wherein the tread body portion does not have a portion configured to be located between the case body and the tread conductive portion. [Claim 7] The non-pneumatic tire according to claim 5, wherein the tread body portion has a portion configured to be located between the case body and the tread conductive portion. [Claim 8] The non-pneumatic tire according to claim 1, wherein the tread member consists only of the tread conductive portion. [Claim 9] Multiple of the aforementioned first parts are arranged at intervals from each other in the circumferential direction of the tire. The non-pneumatic tire according to claim 1, wherein the distance between the plurality of first parts that are spaced apart from each other in the tire circumferential direction is less than or equal to the contact length. [Claim 10] A non-pneumatic tire according to any one of claims 1 to 9, The wheel assembled to the aforementioned case body, A tire and wheel assembly equipped with these features. [Claim 11] A method for manufacturing a non-pneumatic tire according to any one of claims 1 to 9, A case body manufacturing step, which involves manufacturing the aforementioned case body, A tread member manufacturing step, which involves manufacturing the aforementioned tread member, A tread member assembly step involves assembling the tread member obtained in the tread member manufacturing step onto the tire outer circumference side of the case body obtained in the case body manufacturing step, A method for manufacturing non-pneumatic tires, including the method described above. [Claim 12] A method for manufacturing a tire and wheel assembly, A non-pneumatic tire manufacturing step, comprising manufacturing the non-pneumatic tire by the non-pneumatic tire manufacturing method described in claim 11, A wheel assembly step involves assembling the wheel onto the case body of the non-pneumatic tire, A method for manufacturing tire and wheel assemblies, including the method described above.

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