Tire and tire manufacturing method

Abstract

A tire is provided with an inner side part and an outer side part, the outer side part covers at least a part of the outer surface of the inner side part and can be attached and detached relative to the inner side part, the inner side part comprises a reinforcing member, and the outer side part is configured to comprise a tread part which is a part in contact with a road surface of the tire. The outer side portion has a first surface facing the inner side portion and a second surface located at a position facing the first surface.

Description

Technical Field

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

[0002] This application claims the priority based on Japanese application No. 2022-163973 filed on October 12, 2022, and cites all the contents described in the said Japanese application. Background Art

[0003] Patent document 1 discloses a method for manufacturing a retreaded tire, which is characterized in that it includes: a base tire forming step of forming a base tire having a polished surface, wherein the polished surface is a surface from which the tread rubber of a used tire has been removed and polished; a tread pasting base tire forming step of pasting a pre-vulcanized tread rubber body to the polished surface via unvulcanized buffer rubber, thereby forming a tread pasting base tire; and a vulcanization step of vulcanizing the buffer rubber of the tread pasting base tire using a vulcanization mold having a tire molding surface having an outer shape substantially the same as that of the tread pasting base tire, thereby bonding the tread rubber sheet to the base tire.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-188610 Summary of the invention

[0007] The tire disclosed herein is a tire, wherein the tire has an inner portion and an outer portion, the outer portion covers at least a portion of the outer surface of the inner portion and can be removed and assembled relative to the inner portion, the inner portion includes a reinforcement, the outer portion is configured to include a tread portion of the tire as a portion in contact with a road surface, and the outer portion has a first surface opposite to the inner portion and a second surface located opposite to the first surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1A is a cross-sectional view of a tire according to one embodiment of the present disclosure.

[0009] Figure 1B is a cross-sectional view of a tire according to another embodiment of the present disclosure.

[0010] Figure 1C is a cross-sectional view of a tire according to another embodiment of the present disclosure.

[0011] Figure 2 yes Figure 1A The enlarged view of the area A1 is an explanatory view of the reinforcing sheet.

[0012] Figure 3A yes Figure 1A The enlarged view of the area A1 is an explanatory view of the first fitting member.

[0013] Figure 3B yes Figure 1A The enlarged view of the area A1 is an explanatory view of the first fitting member.

[0014] Figure 3C yes Figure 1A The enlarged view of the area A1 is an explanatory view of the first fitting member.

[0015] Figure 3D yes Figure 1A The enlarged view of the area A1 is an explanatory view of the first fitting member.

[0016] Figure 3E yes Figure 1A An enlarged view of area A1.

[0017] Figure 4 It is an explanatory diagram of the arrangement of the first fitting member in the inner portion.

[0018] Figure 5 yes Figure 1A The enlarged view of the area A2 is an explanatory view of the case where the outer side portion includes a reinforcement member.

[0019] Figure 6 yes Figure 1A The enlarged view of the area A2 is an explanatory diagram of the case where the outer side includes a plurality of layers having different colors. DETAILED DESCRIPTION

[0020] [Problems to be Solved by the Present Disclosure]

[0021] Research is underway to retread tires whose tread has been worn.

[0022] However, in the conventional tread retreading method, a new tread portion needs to be formed after the tread portion is cut off, so a large-scale device is required. In addition, special skills are required to cut off the tread portion in a retreadable manner. Therefore, the number of practitioners who can retread the tread portion is limited.

[0023] In addition, tires with different tread rubber and tread groove shapes have been used according to the purpose. However, tires used for specific purposes need to be removed from the vehicle and stored when not in use. Therefore, it is necessary to ensure a storage place for the removed tires.

[0024] Therefore, there is a demand for a tire whose tread portion can be easily installed and removed.

[0025] An object of the present disclosure is to provide a tire whose tread portion can be easily installed and removed.

[0026] [Effects of the present disclosure]

[0027] According to the present disclosure, it is possible to provide a tire whose tread portion can be easily attached and detached.

[0028] [Description of Embodiments of the Present Disclosure]

[0029] First, the embodiments of the present disclosure are described by way of example. In the following description, the same or corresponding elements are denoted by the same reference numerals, and the same description thereof will not be repeated.

[0030] (1) A tire according to one embodiment of the present disclosure is a tire having an inner portion and an outer portion, the outer portion covering at least a portion of an outer surface of the inner portion and being detachable relative to the inner portion, the inner portion including a reinforcement, the outer portion being configured to include a tread portion of the tire that is in contact with a road surface, the outer portion having a first surface opposite to the inner portion and a second surface located opposite to the first surface.

[0031] As described above, in a tire of one embodiment of the present disclosure, the outer portion is configured to include a tread portion of the tire, and the outer portion has a first surface opposite to the inner portion and a second surface located opposite to the first surface. In a tire of one embodiment of the present disclosure, by making the outer portion detachable, the tread portion including the tread groove can be easily detached.

[0032] By including a reinforcement member in the inner portion, the tire can play the role of load retention, rigidity assurance, etc. even when no reinforcement member is arranged in the outer portion. Therefore, the tire of one aspect of the present disclosure can maintain its structure and function.

[0033] (2) In the above (1), the outer portion may be made of rubber only.

[0034] The outer portion is made of rubber only and does not include a reinforcement member, which has the advantage that there is no need to perform work to remove the reinforcement member when the outer portion is disassembled and discarded.

[0035] (3) In the above (1), the outer portion may include rubber and one or more selected from an organic fiber reinforcement and a metal reinforcement.

[0036] By including an organic fiber reinforcement or a metal reinforcement in addition to rubber in the outer portion, the shape of the outer portion can be stabilized, thereby improving durability.

[0037] (4) In any one of the above (1) to (3), the outer portion may include two or more layers of different colors stacked in the radial direction of the tire.

[0038] Since the outer portion includes two or more layers of different colors stacked in the radial direction of the tire, the degree of wear of the outer portion can be easily grasped based on the change in color.

[0039] (5) In any one of the above (1) to (4), the outer portion may cover at least a portion of a side surface of the inner portion.

[0040] By covering at least a portion of the side surface of the inner portion with the outer portion, the outer surface of the inner portion can be protected from external damage in a wide range. Therefore, damage to the inner portion can be suppressed, thereby improving the durability of the tire.

[0041] Furthermore, by forming the outer portion into a shape that covers at least a portion of the side surface of the inner portion, positional displacement of the outer portion can be prevented.

[0042] (6) In any one of the above (1) to (4), the outer portion may cover the entire side surface of the inner portion.

[0043] Since the outer portion covers the entire side surface of the inner portion, the entire outer surface of the inner portion can be protected from external damage. Therefore, damage to the inner portion can be suppressed, thereby improving the durability of the tire.

[0044] Furthermore, by forming the outer portion into a shape that covers the entire side surface of the inner portion, positional deviation of the outer portion can be prevented.

[0045] (7) In any one of the above (1) to (4), the outer portion may be arranged only on the tread portion.

[0046] By arranging the outer portion only on the tread portion of the tire, the size of the outer portion can be reduced. Therefore, the space required for storing the removed outer portion can be reduced. In addition, in particular, compared with the case where the entire tire is discarded, the amount of waste when the outer portion is discarded can be reduced.

[0047] (8) In any one of the above (1) to (7), a reinforcing sheet may be arranged between the inner portion and the outer portion, and the reinforcing sheet may include rubber and a plurality of organic fibers arranged in the rubber.

[0048] By arranging the reinforcing sheet between the inner part and the outer part, even if the tire runs over a protrusion and a part of the outer part is damaged, the protrusion can be prevented from reaching the inner part. Therefore, by preventing the inner part from being damaged and replacing the damaged outer part, the tire can be continuously used, thereby improving the durability of the tire.

[0049] (9) In any one of the above (1) to (8), the inner portion may have a mark indicating a location where the outer portion is provided.

[0050] Since the inner part has a mark indicating the installation position of the outer part, the position can be easily determined when the outer part is installed on the inner part. Therefore, the outer part can be attached simply and efficiently.

[0051] In addition, the inner part and the outer part may also have a first fitting member and a second fitting member, but when the two members are not fitted, the position of the outer part will be offset from the appropriate position in the design. In this case, by having a mark on the inner part, it can also be determined whether the outer part is properly arranged on the inner part.

[0052] (10) In any one of the above (1) to (9), the inner portion may include a first fitting member on a surface facing the outer portion, and the outer portion may include a second fitting member on the first surface to fit with the first fitting member.

[0053] By providing the first and second fitting members that fit together on the inner and outer parts, the closeness between the inner and outer parts can be improved. Therefore, even when the pressure of the gas filled in the internal space decreases, the inner and outer parts can be prevented from peeling off.

[0054] (11) In the above (10), the first fitting member may be provided along the circumferential direction of the tire.

[0055] By providing the first fitting member on the outer surface of the inner portion along the circumferential direction of the tire, the adhesion between the inner portion and the outer portion can be improved more uniformly along the circumferential direction of the tire. Therefore, even if the pressure of the gas filled in the internal space decreases, the inner portion and the outer portion can be prevented from peeling off.

[0056] (12) In any one of the above (1) to (9), at least a surface of the inner portion facing the outer portion may be a flat surface.

[0057] By making the surface of the inner portion facing the outer portion a flat surface, the work of removing and attaching the outer portion becomes easy, and the outer portion can be particularly easily attached and detached.

[0058] (13) In any one of the above (1) to (12), the tire may be a tube tire or a tubeless tire.

[0059] By setting the tire as a tube tire or a tubeless tire and filling the inner space of the tire with gas such as air, the inner portion expands in the radial direction of the tire and is pushed against the outer portion. Therefore, the outer portion is in close contact with the outer surface of the inner portion. Therefore, even if the tire is attached to a car or the like and driven, the outer portion can be prevented from being peeled off.

[0060] (14) A tire manufacturing method according to one embodiment of the present invention is a tire manufacturing method, wherein the tire has an inner portion and an outer portion, the outer portion covers at least a portion of an outer surface of the inner portion and can be disassembled relative to the inner portion, the inner portion includes a reinforcement, and the outer portion has a first surface opposite to the inner portion and a second surface located opposite to the first surface. The tire manufacturing method comprises: a setting step of setting the outer portion on the inner portion in such a manner that the outer portion includes a tread portion of the tire that is a portion in contact with a road surface.

[0061] According to the tire manufacturing method of one aspect of the present disclosure, it is possible to manufacture a tire whose outer side portion can be easily attached or detached.

[0062] (15) A tire manufacturing method according to one embodiment of the present invention is a tire manufacturing method, wherein the tire has an inner portion and an outer portion, the outer portion covers at least a portion of the outer surface of the inner portion and can be disassembled relative to the inner portion, the inner portion includes a reinforcement, and the outer portion has a first surface opposite to the inner portion and a second surface located opposite to the first surface. The tire manufacturing method comprises: a disassembly step of removing a first outer portion as the outer portion provided on the outer surface of the inner portion; and a setting step of setting the second outer portion on the inner portion in a manner that the second outer portion as the new outer portion includes a tread portion of the tire as a portion in contact with a road surface.

[0063] According to the tire manufacturing method of one aspect of the present disclosure including the disassembly step and the installation step, a new tire can be manufactured in which the state of the tread portion is different from the state of the tread portion before the disassembly step.

[0064] [Details of the embodiments of the present disclosure]

[0065] Hereinafter, a tire and a specific example of a method for manufacturing a tire according to an embodiment of the present disclosure (hereinafter referred to as "this embodiment") will be described with reference to the accompanying drawings. It should be noted that the present invention is not limited to these examples, but is indicated by the claims, and is intended to include all changes within the meaning and scope equivalent to the claims.

[0066] 〔tire〕

[0067] exist Figure 1A 2 shows a configuration example of the tire 10 according to the present embodiment. Figure 1A FIG. 2 shows a cross-sectional view of the tire 10 according to the present embodiment taken along a plane perpendicular to the circumferential direction. Figure 1A In the figure, only the portion to the left of CL (center line) is shown, but with CL as the axis of symmetry, the same structure continues on the right side of CL.

[0068] Figure 1B , Figure 1C and Figure 1A Likewise, this corresponds to a cross-sectional view taken along a plane perpendicular to the circumferential direction of the tire 10 . Figure 1B , Figure 1C yes Figure 1A The tire 10 shown is a modified example. Figure 1A to illustrate, and use as needed Figure 1B , Figure 1C to explain.

[0069] also, Figure 2 With reinforcement sheet Figure 1A An enlarged view of area A1.

[0070] FIG. 3A to FIG. 3D yes Figure 1A The enlarged view of the area A1 is an explanatory view of the first fitting member.

[0071] Figure 3E yes Figure 1A The enlarged view of the region A1 is an explanatory view of the case where the outer surface of the inner portion is a flat surface.

[0072] Figure 4 It is an explanatory diagram of the arrangement of the first fitting member in the inner portion.

[0073] Figure 5 yes Figure 1A The enlarged view of the area A2 is an explanatory view of the case where the outer side portion includes a reinforcement member.

[0074] Figure 6 yes Figure 1A The enlarged view of the area A2 is an explanatory diagram of the case where the outer side includes a plurality of layers having different colors.

[0075] exist Figures 1A to 6 , the X-axis is an axis along the width of the tire 10. The Z-axis is an axis along the radial direction of the tire 10. The radial direction refers to the direction along the radius of the tire 10 from the center (rotation axis) of the tire 10 toward the outer periphery of the tire 10. The Y-axis is an axis representing the circumferential direction of the tire 10 on the XZ plane.

[0076] Figures 1A to 6 Each of them is a schematic diagram for explaining a configuration example of a member included in the tire 10 of the present embodiment, and does not accurately represent the dimensions.

[0077] like Figure 1A As shown, the tire 10 includes a tread portion 10A, a sidewall portion 10B, and a bead portion 10C.

[0078] The tread portion 10A is a portion in contact with the road surface. The bead portion 10C is provided at a position closer to the rotation axis of the tire 10 than the tread portion 10A. The bead portion 10C is a portion in contact with the rim of the wheel of the vehicle. The sidewall portion 10B connects the tread portion 10A and the bead portion 10C. When the tread portion 10A is impacted by the road surface, the sidewall portion 10B elastically deforms to absorb the impact.

[0079] The inventors of the present invention have studied a tire that can easily detach the tread portion 10A. As a result, they found that by using a tire 10 having an inner portion 11 and an outer portion 12 that can be detached relative to the inner portion 11, the tread portion can be easily detached, thereby completing the present invention.

[0080] Therefore, the tire 10 of the present embodiment includes the inner portion 11 and the outer portion 12 that covers at least a portion of the outer surface of the inner portion 11 and is attachable to and detachable from the inner portion 11 .

[0081] Each part is described below.

[0082] (1) Medial part

[0083] (1-1) Components included in the inner portion

[0084] (Reinforcement)

[0085] The inner portion 11 includes a reinforcement. The reinforcement can constitute the skeleton of the tire 10. Examples of the reinforcement include a carcass 112, a bead wire 113, and a belt layer 114. As described below, the inner portion 11 may include one or more selected from an organic fiber reinforcement and a metal reinforcement as a reinforcement, and it is particularly preferred that the inner portion 11 includes both an organic fiber reinforcement and a metal reinforcement.

[0086] Examples of the organic fiber reinforcement include one or more selected from nylon fiber, polyester fiber, rayon fiber, and aramid fiber. Examples of the nylon fiber include one or more selected from nylon 6 fiber and nylon 66 fiber.

[0087] As a metal reinforcement, a steel cord is mentioned. The steel cord may be a twisted wire or a single wire. When the steel cord is a single wire, the cross section of the steel cord may be circular, or the cross section of the steel cord may be processed to have a shape other than a circular shape.

[0088] The carcass 112 may include organic fibers such as nylon fibers, polyester fibers, rayon fibers, aramid fibers, etc., or steel cords and rubber.

[0089] The bead wire 113 is provided in the bead portion 10C. The bead wire 113 receives the tensile force acting on the carcass 112.

[0090] The belt layer 114 fastens the carcass 112 to improve the rigidity of the tread portion 10A. The belt layer 114 may include steel cords and rubber. Figure 1A In the example shown, the tire 10 has two belt layers 114 , but the present invention is not limited to this embodiment. The tire 10 may have any number of belt layers depending on the characteristics required of the tire 10 .

[0091] The inner portion 11 may further include an inner liner 111. The inner liner 111 may be made of rubber and seals the space between the tire 10 and the wheel. Therefore, when the tire 10 is a tubeless tire, the tire 10 may include the inner liner 111. Preferably, the tire 10 of the present embodiment is a tube tire or a tubeless tire.

[0092] Since the inner portion 11 includes a reinforcement, the tire 10 can play the role of load retention, rigidity assurance, etc. even when no reinforcement is arranged in the outer portion 12. Therefore, the tire 10 can maintain its structure and function.

[0093] The outer peripheral surface 11A of the inner portion 11 may be a flat surface, or may be provided with a first fitting member described later. The outer peripheral surface 11A is a surface located in the tread portion 10A of the tire 10 and facing the outer portion 12 .

[0094] An internal space 100 is disposed closer to the rotation axis of the tire 10 than the inner portion 11 , and may be directly filled with a gas such as air, or an inner tube (not shown) may be disposed therein.

[0095] As described above, the tire 10 of this embodiment can be a pneumatic tire (air tire) as a tube tire or a tubeless tire. In this way, by setting the tire 10 of this embodiment as a pneumatic tire and filling the internal space 100 with a gas such as air, the inner portion 11 will be as Figure 1A As shown in the figure, the tire 10 expands along the radial direction, that is, along the Z axis, and is pushed against the outer portion 12. Therefore, the outer portion 12 is in close contact with the outer surface of the inner portion 11. Therefore, even when the tire 10 is attached to a car or the like and driven, the outer portion 12 can be prevented from being peeled off.

[0096] (rubber)

[0097] The inner portion 11 may contain rubber in addition to the reinforcement.

[0098] Rubber is obtained by molding a rubber composition and vulcanizing it.

[0099] The specific combination of rubbers can be selected according to the application of the tire, the properties required of the tire, etc., and is not particularly limited. The rubber may contain, for example, a rubber component, sulfur, and a vulcanization accelerator.

[0100] The specific materials of the rubber component, sulfur, and vulcanization accelerator are not particularly limited. For example, the rubber component, sulfur, and vulcanization accelerator generally used in the rubber industry can be used.

[0101] The rubber composition used for the inner portion 11 can be produced by kneading, heating, and extruding these components.

[0102] In addition, the rubber may contain any components other than the above-mentioned rubber components, sulfur, vulcanization accelerators, etc. The rubber may contain reinforcing agents such as carbon black and silica, wax, anti-aging agents, and other known additives for rubber.

[0103] (1-2) Symbols

[0104] The inner portion 11 may have a mark indicating the installation position of the outer portion 12 .

[0105] like Figure 1B As shown in FIG. 1 , the outer portion 12 may also be configured to expose a portion of the side surface 11B of the inner portion 11. Figure 1C As shown, the outer portion 12 may be disposed only in the tread portion 10A of the tire 10 .

[0106] The outer part 12 is a member attached to or detached from the inner part 11. Therefore, it is preferable that the inner part 11 has a mark 14 so that the setting position of the outer part 12 can be easily determined when the outer part 12 covers only a part of the outer surface of the inner part 11.

[0107] The mark 14 may be configured to make the installation position of the outer portion 12 known, and its form is not limited. Figure 1B , Figure 1C As shown, the mark 14 may be disposed on the outer surface of the inner portion 11 at a position adjacent to the end 12C of the outer portion 12. Figure 1B , Figure 1C As shown, the mark 14 can be formed as a protrusion. In addition, the mark 14 can also be a printed material or a recessed portion printed on the outer surface of the inner portion 11.

[0108] Since the inner portion 11 has the mark 14 indicating the installation position of the outer portion 12, the installation position can be easily determined when the outer portion 12 is installed in the inner portion 11. Therefore, the installation of the outer portion 12 can be performed simply and efficiently.

[0109] In addition, as described later, the inner portion 11 and the outer portion 12 may also have a first fitting member and a second fitting member, but when the two members are not fitted, the position of the outer portion 12 may be offset from the appropriate position in the design. In this case, the inner portion 11 has a mark 14, so that it can be determined whether the outer portion 12 is properly arranged on the inner portion 11.

[0110] (2) Outer part

[0111] (2-1) Shape and configuration of the outer part

[0112] The outer portion 12 covers at least a portion of the outer surface of the inner portion 11 and can be detached from the inner portion 11. Here, the detachable means that the inner portion 11 and the outer portion 12 are not bonded by vulcanization. That is, the inner portion 11 and the outer portion 12 are separate components that are not integrated, and no excessive bonding force is applied between the two components. Therefore, the outer portion 12 can be attached to the inner portion 11 or detached from the inner portion 11.

[0113] Alternatively, the first fitting member and the second fitting member described below may be provided on the inner portion 11 and the outer portion 12, respectively, or an adhesive may be placed between the two members, thereby increasing the bonding strength between the two members to a level that does not make it impossible to remove the outer portion 12. However, in order to prevent the inner portion 11 from being damaged when the outer portion 12 is removed, it is preferred that no adhesive is placed between the two members.

[0114] The outer portion 12 is disposed so as to include the tread portion 10A which is a portion (location) in contact with the road surface of the tire 10. That is, the outer portion 12 is disposed in a region including the tread portion 10A of the tire 10 and constitutes the tread portion 10A.

[0115] The outer portion 12 has a first surface 12B facing the inner portion 11 and a second surface 12A located opposite to the first surface 12B. Furthermore, the outer portion 12 may have a tread groove 13 on the second surface 12A.

[0116] In the tire 10 of the present embodiment, since the outer portion 12 is detachable, the tread portion 10A including the tread grooves 13 can be easily detached.

[0117] According to the tire 10 of the present embodiment, for example, when the outer portion 12 is damaged, the damaged outer portion 12 can be replaced with a new outer portion 12. It should be noted that, when the inner portion 11 is damaged, the damaged inner portion 11 can be replaced with a new inner portion 11, and the outer portion 12 previously provided on the inner portion 11 can be provided on the new inner portion 11. In this way, by configuring the outer portion 12 to be detachable relative to the inner portion 11, only the damaged portions of the inner portion 11 and the outer portion 12 can be replaced, and the amount of waste can be reduced compared to the case where the entire tire is discarded when a part of the tire is damaged.

[0118] In addition, for example, the outer part 12 corresponding to the season, the purpose of use, the road surface condition, etc. may be prepared, such as the outer part for studless anti-skid, the outer part for summer tires, the outer part for sand, the outer part for swamps, etc. In addition, the outer part 12 corresponding to the season, the purpose of use, the road surface condition, etc. may be attached to the inner part 11.

[0119] Conventionally, a variety of tires corresponding to the season, purpose of use, road conditions, etc. are required, and a space for storing unattached tires needs to be secured. In contrast, according to the tire 10 of this embodiment, by configuring the outer portion 12 to be detachable relative to the inner portion 11, it is sufficient to prepare only the outer portion 12 corresponding to the season, purpose of use, road conditions, etc. Therefore, it is sufficient to secure only the space for storing the removed outer portion 12, and the space required for storage can be reduced compared to the case of storing the entire tire.

[0120] The outer portion 12 may be disposed at a location other than the tread portion 10A of the tire 10 .

[0121] For example, Figure 1B As shown, the outer portion 12 may be arranged to cover at least a portion of the side surface 11B of the inner portion 11. The side surface 11B of the inner portion 11 refers to a portion of the outer surface of the inner portion 11 excluding the tread portion 10A of the tire 10.

[0122] As described above, the outer portion 12 is arranged to include the tread portion 10A of the tire 10. Therefore, in the above case, the outer portion 12 is arranged from the tread portion 10A of the tire 10 to at least a part of the sidewall portion 10B.

[0123] The outer portion 12 covers at least a portion of the side surface 11B of the inner portion 11, thereby protecting the outer surface of the inner portion 11 from external damage in a wide range. Therefore, damage to the inner portion 11 is suppressed, and the durability of the tire 10 can be improved.

[0124] Furthermore, since the outer portion 12 is formed into a shape that covers at least a portion of the side surface 11B of the inner portion 11 , positional deviation of the outer portion 12 can be prevented.

[0125] For example Figure 1A As shown, the outer portion 12 may be arranged so as to cover the entire side surface 11B of the inner portion 11. That is, the outer portion 12 may be arranged so that the end 11C of the inner portion 11 and the end 12C of the outer portion 12 coincide with each other.

[0126] The outer portion 12 covers the entire side surface 11B of the inner portion 11, thereby protecting the entire outer surface of the inner portion 11 from external damage. Therefore, the inner portion 11 is prevented from being damaged, and the durability of the tire 10 can be improved.

[0127] Furthermore, since the outer portion 12 is formed into a shape that covers the entire side surface 11B of the inner portion 11 , it is possible to prevent the outer portion 12 from being displaced.

[0128] In addition, for example Figure 1C As shown, the outer portion 12 may be disposed only on the tread portion 10A of the tire 10. In this case, the side surface 11B of the inner portion 11 is not covered by the outer portion 12 and is exposed.

[0129] By arranging the outer portion 12 only in the tread portion 10A of the tire 10, the size of the outer portion 12 can be reduced. Therefore, it is possible to reduce the space required for storing the removed outer portion 12. In addition, in particular, compared with the case where the entire tire is discarded, the amount of waste when the outer portion 12 is discarded can be reduced.

[0130] (2-2) Components included in the outer portion

[0131] The outer portion 12 may be formed only of rubber.

[0132] The outer portion 12 is made of rubber only and does not include a reinforcement, which has the advantage that there is no need to perform work to remove the reinforcement when the outer portion 12 is disassembled and discarded.

[0133] like Figure 5 As shown, the outer portion 12 may include rubber 51 and a reinforcement member 52 , wherein the reinforcement member 52 is one or more selected from an organic fiber reinforcement member and a metal reinforcement member. Figure 5 Yes Figure 1A The schematic diagram shows an enlarged view of the area A2 in FIG. 1 , that is, the outer portion 12 .

[0134] like Figure 5 As shown, by including the outer portion 12 with the reinforcement 52 which is an organic fiber reinforcement or a metal reinforcement in addition to the rubber 51, the shape of the outer portion 12 is stabilized, and durability can be improved.

[0135] However, when the outer portion 12 includes the reinforcement 52 , it is preferable to pay attention to the storage environment from the viewpoint of preventing the adhesiveness between the reinforcement 52 and the rubber 51 from being reduced.

[0136] Furthermore, when the outer portion 12 includes a metal reinforcement as the reinforcement 52, it is necessary to remove the metal reinforcement when discarding. Therefore, when the outer portion 12 includes the reinforcement 52, it is preferable that the reinforcement 52 included in the outer portion 12 is an organic fiber reinforcement.

[0137] As the rubber 51 , for example, the same rubber as described in the inner portion 11 can be used as appropriate, and therefore description of components contained in the rubber will be omitted.

[0138] As the organic fiber reinforcement and the metal reinforcement, the same reinforcements as those described in the inner portion 11 can be used, and thus description thereof will be omitted here.

[0139] The outer portion 12 includes the tread portion 10A of the tire 10 . For example, when the tread grooves 13 become shallow due to wear, only the outer portion 12 may be removed and replaced.

[0140] However, the present invention is not limited to this form, and for example, an outer portion for studless anti-skid, an outer portion for summer tires, an outer portion for sand, an outer portion for swamps, etc. may be prepared as the outer portion 12. In addition, the outer portion 12 may be configured to be attachable according to the season, the purpose of use of the tire 10, the road surface conditions, etc. Therefore, the rubber of the outer portion 12 may be different according to the purpose of use such as studless anti-skid, summer tires, sand, swamps, etc.

[0141] like Figure 6 As shown, the outer portion 12 may also include a radial direction of the tire 10, that is, along the Figure 6 Stacking two or more layers with different colors in the Z-axis. Figure 6 Yes Figure 1A A schematic diagram showing an enlarged area A2 in FIG.

[0142] exist Figure 6 In the embodiment, the outer portion 12 includes three layers: a first layer 61, a second layer 62, and a third layer 63. For example, the rubber of each layer may be colored, and different colors may be used for the first layer 61, the second layer 62, and the third layer 63. Since the outer portion 12 includes two or more layers of different colors stacked in the radial direction of the tire, the degree of wear of the outer portion 12 can be easily grasped by the change in color. When the outer portion 12 includes a plurality of layers of different colors, it is preferred that the layers are bonded by vulcanization to form a whole.

[0143] When the outer portion 12 includes a plurality of layers of different colors, the plurality of layers of different colors may be arranged on the entire outer portion 12 or may be arranged only in a portion of the region where the degree of wear is required to be sensed.

[0144] exist Figure 6 In the embodiment, the outer portion 12 includes three layers, but the present invention is not limited to this embodiment. The outer portion 12 may include one layer, two layers, or four or more layers.

[0145] The tire according to the present embodiment may further include any member.

[0146] (3) Reinforcement sheet

[0147] exist Figure 2 shown in the Figure 1A The area A1, that is, the periphery of the interface between the inner portion 11 and the outer portion 12 is enlarged.

[0148] like Figure 2 As shown, the tire 10 of the present embodiment may include a reinforcing sheet 21 disposed between the inner portion 11 and the outer portion 12 .

[0149] The reinforcing sheet 21 may include, for example, rubber 212 and a plurality of organic fibers 211 disposed in the rubber 212 .

[0150] By disposing the reinforcing sheet 21 between the inner portion 11 and the outer portion 12, even if the tire 10 runs over a protrusion and a part of the outer portion 12 is damaged, the protrusion can be prevented from reaching the inner portion 11. Therefore, by preventing the inner portion 11 from being damaged and replacing the damaged outer portion 12, the tire 10 can continue to be used, thereby improving the durability of the tire 10.

[0151] The reinforcing sheet 21 may be formed by a part of the outer portion 12 .

[0152] When the reinforcing sheet 21 is disposed between the inner portion 11 and the outer portion 12, the reinforcing sheet 21 may be disposed in the entire region where the inner portion 11 and the outer portion 12 are opposite, or may be disposed in only a portion of the region. For example, the reinforcing sheet 21 may be disposed only in the region of the tread portion 10A where the possibility of the tire 10 contacting a protrusion or the like is high.

[0153] As the rubber, for example, the same rubber as described in the inner portion 11 can be used appropriately, and thus the description thereof will be omitted.

[0154] Examples of the organic fiber include one or more selected from nylon fiber, polyester fiber, rayon fiber, and aramid fiber. Examples of the nylon fiber include one or more selected from nylon 6 fiber and nylon 66 fiber.

[0155] (4) First fitting member and second fitting member

[0156] The inner portion 11 may include a first fitting member on a surface facing the outer portion 12. In addition, the outer portion 12 may include a second fitting member on the first surface 12B to be fitted with the first fitting member.

[0157] The first fitting member may be configured to fit with the second fitting member. FIG. 3A to FIG. 3D The convex member shown in the figure may be a concave member provided on the outer surface of the inner portion 11 .

[0158] In such FIG. 3A to FIG. 3D As shown in FIG. 1 , when the first fitting member is a convex member protruding from the outer surface of the inner portion 11 , the second fitting member is a concave member that fits with the convex member.

[0159] When the first fitting member is a concave member, the second fitting member is a convex member that fits with the concave first fitting member.

[0160] exist FIG. 3A to FIG. 3D 2 shows a configuration example of the first fitting members 31A to 31D.

[0161] The first fitting members 31A to 31D are provided on the surface of the inner portion 11 that is opposite to the outer portion 12. FIG. 3A to FIG. 3D As shown, the first fitting members 31A to 31D are members that fit with the second fitting members 32A to 32D.

[0162] The first fitting member may be Figure 3A The first fitting member may be a columnar (rod-shaped) member such as the first fitting member 31A shown in FIG. Figure 3B The first fitting member 31B shown in FIG. 1 may have an L shape. Figure 3C The first fitting member 31C shown in FIG. 1 may have a T-shape. Figure 3D The first fitting member 31D shown has a T-shape with a curved upper surface.

[0163] In any case, the second fitting members 32A to 32D have shapes that can be fitted with the first fitting members 31A to 31D.

[0164] It should be noted that the inner portion 11 may include a plurality of first engaging members having different shapes and projections and depressions.

[0165] By providing the first and second fitting members that fit each other on the inner portion 11 and the outer portion 12, the closeness between the inner portion 11 and the outer portion 12 can be improved. Therefore, even when the pressure of the gas filled in the internal space 100 decreases, the inner portion 11 and the outer portion 12 can be prevented from peeling off.

[0166] The range, position, etc. of setting the first interlocking member are not particularly limited. Figure 4 Shown in Figure 1A Schematic diagram of the inner portion 11 observed along the hollow arrow B in FIG.

[0167] like Figure 4 As shown, it is preferred that the first fitting member 31 is provided on the outer surface of the inner portion 11 along the circumferential direction of the tire 10 , that is, along the Y-axis.

[0168] By providing the first fitting member on the outer surface of the inner portion 11 along the circumferential direction of the tire 10, the closeness between the inner portion 11 and the outer portion 12 can be improved more uniformly along the circumferential direction of the tire 10. Therefore, even when the pressure of the gas filled in the internal space 100 decreases, the inner portion 11 and the outer portion 12 can be prevented from being separated.

[0169] like Figure 4 As shown, the first fitting member 31 may be provided intermittently along the circumferential direction of the tire 10 or may be provided continuously.

[0170] The first fitting member may be a member integrated with the inner portion 11. That is, the first fitting member may be a member constituting the inner portion 11.

[0171] The first fitting member may be fixed to the inner portion 11 by screws or the like so as to be detachable. By making the first fitting member detachable, even if the first fitting member is damaged, the inner portion 11 can be continuously used by replacing the damaged first fitting member.

[0172] The second fitting member is configured to be fittable with the first fitting member, and other points may be the same as those of the first fitting member.

[0173] Therefore, it is preferred that the second fitting member is also provided along the circumferential direction of the tire on the first surface 12B of the outer portion 12. The second fitting member may be provided intermittently or continuously along the circumferential direction of the tire. The second fitting member is a member that fits with the first fitting member, and therefore may be arranged at a position corresponding to the first fitting member.

[0174] In addition, the second fitting member may be fixed to the outer portion 12 by screws or the like, thereby being configured to be attachable and detachable.

[0175] The outer surface of the inner portion 11 is not limited to the form having the first fitting member. Alternatively, at least the surface of the inner portion 11 facing the outer portion 12 may be a flat surface. Figure 1A An enlarged view of area A1 Figure 3E As shown, the outer peripheral surface 11A as the outer surface of the inner portion 11 and the first surface 12B of the outer portion 12 may be both flat surfaces. The flat surface referred to here means a surface without concave or convex portions such as the first fitting member and the second fitting member.

[0176] By making the outer surface of the inner portion 11 a flat surface, the work of removing and attaching the outer portion 12 becomes easy, and the outer portion 12 can be attached and detached particularly easily.

[0177] [Tire manufacturing method]

[0178] A method for manufacturing a tire according to the present embodiment will be described. According to the method for manufacturing a tire according to the present embodiment, a tire according to one aspect of the present disclosure can be manufactured. Therefore, a part of the description of matters that have already been described will be omitted.

[0179] The tire manufactured by the tire manufacturing method of the present embodiment has an inner portion 11 and an outer portion 12, wherein the outer portion 12 covers at least a portion of the outer surface of the inner portion 11 and can be detached from the inner portion 11. In addition, the inner portion 11 includes a reinforcement. In addition, the outer portion 12 has a first surface 12B opposite to the inner portion 11 and a second surface 12A located at a position opposite to the first surface 12B. The outer portion 12 may have a tread groove 13 on the second surface 12A.

[0180] The tire manufacturing method according to the present embodiment may include the following setting steps.

[0181] In the installation step, the outer portion 12 may be installed on the inner portion 11 such that the outer portion 12 includes the tread portion 10A, which is a portion of the tire 10 that comes into contact with the road surface.

[0182] In the installation step, it is preferable to reduce the pressure of the gas in the internal space 100 of the inner portion 11 so that the outer portion 12 can be easily installed on the outer surface of the inner portion 11 .

[0183] Furthermore, the outer portion 12 may be provided at a predetermined position so as to cover at least a portion of the outer surface of the inner portion 11 .

[0184] When the mark 14 is provided on the outer surface of the inner portion 11 , the outer portion 12 may be provided to match the mark 14 .

[0185] As already described, the inner portion 11 may also have a first interlocking member on the surface opposite to the outer portion 12. In this case, the outer portion 12 may have a second interlocking member interlocked with the first interlocking member on the first surface 12B. In the case where the inner portion 11 and the outer portion 12 respectively have the first interlocking member and the second interlocking member, in the setting process, the outer portion 12 may be set in a manner such that the positions of the first interlocking member and the second interlocking member are aligned. Furthermore, it is preferred that, for example, the first interlocking member and the second interlocking member are interlocked when the inner portion 11 and the outer portion 12 are closely fitted by filling the internal space 100 with gas. It should be noted that the first interlocking member and the second interlocking member may also be interlocked before the internal space 100 is filled with gas.

[0186] According to the tire manufacturing method of the present embodiment described above, a tire in which the outer side portion 12 can be easily attached or detached can be manufactured.

[0187] Furthermore, the tire manufacturing method of the present embodiment may include a disassembly step before the installation step. Therefore, the tire manufacturing method of the present embodiment may include the following disassembly step and installation step.

[0188] In the disassembly step, the first outer portion as the outer portion 12 provided on the outer surface of the inner portion 11 may be removed.

[0189] In the installation step, the second outer portion may be installed on the inner portion such that the second outer portion as the new outer portion 12 includes the tread portion 10A of the tire 10 which is a portion in contact with the road surface.

[0190] As the first outer portion of the outer portion 12 before removal in the removal step, for example, there can be mentioned the outer portion 12 in which the tread groove 13 is shallow due to wear.

[0191] In addition, as the outer portion 12, for example, an outer portion for studless anti-skid, an outer portion for summer tires, an outer portion for sand, an outer portion for swamps, etc. can also be prepared. In addition, the outer portion 12 can be configured to be changeable according to the season, the use of the tire 10, the road condition, etc. Therefore, the first outer portion removed in the removal process can also be the outer portion 12 before being changed according to the season, the use, the road condition, etc.

[0192] The second outer portion provided in the installation step may be a new outer portion 12 of a tread groove having a sufficient depth. In addition, as described above, the outer portion 12 may be selected for any purpose according to the season, the intended use, the road surface condition, and the like.

[0193] In the disassembly process, for example, by reducing the pressure of the gas in the internal space 100 of the inner portion 11 , the outer portion 12 can be easily removed.

[0194] As described above, when the inner portion 11 and the outer portion 12 have the first fitting member and the second fitting member, respectively, the outer portion 12 can be removed from the inner portion 11 by releasing the fitting between the first fitting member and the second fitting member in the removal step.

[0195] When the disassembly process is completed, the outer portion 12 is removed, so that only the inner portion 11 remains, and the outer surface of the inner portion 11 including the tread portion 10A of the tire 10 is exposed.

[0196] In the setting step, the second outer portion is set on the inner portion 11 from which the first outer portion has been removed in the removal step. The operation in the setting step has been described, and therefore the description thereof will be omitted.

[0197] According to the tire manufacturing method of the present embodiment having the above-described removal step and installation step, a new tire can be manufactured in which the state of the tread portion is different from the state of the tread portion before the removal step.

[0198] Although the embodiments have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope described in the claims.

[0199] Description of Reference Numerals

[0200] 10: tire; 10A: tread portion; 10B: sidewall portion; 10C: bead portion; 100: internal space;

[0201] 11: inner side; 11A: outer peripheral surface (outer surface of inner side); 11B: side surface (outer surface of inner side); 11C: end; 111: inner liner; 112: carcass (reinforcement); 113: bead wire (reinforcement); 114: belt layer (reinforcement); 12: outer side (first outer side, second outer side); 12A: second surface; 12B: first surface; 12C: end; 13: tread groove; 14: mark; CL: center line; 21: reinforcement sheet; 211: organic fiber; 212: rubber; 31: first interlocking member; 31A: first interlocking member; 31B: first interlocking member; 31C: first interlocking member; 31D: first interlocking member; 32A: second interlocking member; 32B: second interlocking member; 32C: second interlocking member; 32D: second interlocking member; 51: rubber; 52: reinforcement; 61: first layer; 62: second layer; 63: third layer; X: X-axis; Y: Y-axis; Z: Z-axis; A1: area; A2: area; B: hollow arrow.

Claims

1. A tire, wherein: The tire has an inner portion and an outer portion, wherein the outer portion covers at least a portion of an outer surface of the inner portion and can be attached or detached relative to the inner portion. The inner side portion includes a reinforcement member, The outer portion is configured to include a tread portion of the tire that is a portion in contact with a road surface, and has a first surface facing the inner portion and a second surface located opposite to the first surface.

2. The tire according to claim 1, wherein: The outer side is composed only of rubber.

3. The tire according to claim 1, wherein: The outer portion includes rubber and one or more selected from an organic fiber reinforcement member and a metal reinforcement member.

4. The tire according to any one of claims 1 to 3, wherein: The outer portion includes two or more layers having different colors stacked in the radial direction of the tire.

5. The tire according to any one of claims 1 to 3, wherein: The outer portion covers at least a portion of a side surface of the inner portion.

6. The tire according to any one of claims 1 to 3, wherein: The outer portion covers the entire side surface of the inner portion.

7. The tire according to any one of claims 1 to 3, wherein: The outer portion is arranged only on the tread portion.

8. The tire according to any one of claims 1 to 3, wherein: A reinforcing sheet is disposed between the inner portion and the outer portion, and the reinforcing sheet includes rubber and a plurality of organic fibers disposed in the rubber.

9. The tire according to any one of claims 1 to 3, wherein: The inner portion has a mark indicating a location where the outer portion is provided.

10. The tire according to any one of claims 1 to 3, wherein: The inner portion has a first fitting member on a surface facing the outer portion. The outer portion includes a second fitting member on the first surface to be fitted with the first fitting member.

11. The tire according to claim 10, wherein: The first fitting member is provided along the circumferential direction of the tire.

12. The tire according to any one of claims 1 to 3, wherein: At least a surface of the inner portion facing the outer portion is a flat surface.

13. The tire according to any one of claims 1 to 3, wherein: The tire is a tube-type tire or a tubeless tire.

14. A method for manufacturing a tire, wherein: The tire has an inner portion and an outer portion, wherein the outer portion covers at least a portion of an outer surface of the inner portion and can be attached or detached relative to the inner portion. The inner side portion includes a reinforcement member, The outer portion has a first surface facing the inner portion and a second surface located opposite to the first surface. The tire manufacturing method includes a step of providing the outer portion on the inner portion such that the outer portion includes a tread portion of the tire that is in contact with a road surface.

15. A method for manufacturing a tire, wherein: The tire has an inner portion and an outer portion, wherein the outer portion covers at least a portion of an outer surface of the inner portion and can be attached or detached relative to the inner portion. The inner side portion includes a reinforcement member, The outer portion has a first surface facing the inner portion and a second surface located opposite to the first surface. The tire manufacturing method comprises: a disassembly step of removing a first outer portion as the outer portion provided on an outer surface of the inner portion; and In a step of providing, the second outer portion is provided on the inner portion such that the second outer portion as the new outer portion includes a tread portion of the tire which is a portion in contact with a road surface.

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