Solid tire and method of manufacturing the same

Abstract

The present application provides a solid tire provided with an RFID tag for product identification, capable of ensuring the protection effect of the RFID tag and exhibiting good response accuracy, and a manufacturing method thereof. In a solid tire (10) provided with a tread rubber layer (1) on the tread surface side and a base rubber layer (2) on the rim side and having a side surface (S) extending from the tread rubber layer (1) to the base rubber layer (2) in the radial direction of the tire, an RFID tag (11) is embedded in the interior of the solid tire (10), and the RFID tag (11) is disposed in the vicinity of the side surface (S). When a rubber sheet (20) is subjected to multi-layer winding to form an unvulcanized tire (10X), the RFID tag (11) is inserted between the layers of the rubber sheet (20) at the middle of the multi-layer winding, or the RFID tag (11) and a cover layer (21) are laminated to the side surface of the unvulcanized tire (10X), and then the unvulcanized tire (10X) provided with the RFID tag (11) is vulcanized in a mold.

Description

Technical Field

[0001] This invention relates to a solid tire, represented by a pneumatic type buffer tire for industrial vehicles, and a method for manufacturing the same. More specifically, it relates to a solid tire equipped with an RFID (Radio Frequency Identification) tag for product identification, which ensures the protective effect of the RFID tag and provides good response accuracy, and a method for manufacturing the same. Background Technology

[0002] Pneumatic impact-resistant tires for industrial vehicles are solid forklift tires with the same shape as pneumatic tires. These solid tires are used under low-speed and high-load conditions, and depending on the situation, under harsh conditions such as steering operations while stationary.

[0003] Generally, solid tires have a tread rubber layer on the tread side and a base rubber layer on the rim side. The base rubber layer is made of a hard rubber composition, and the tread rubber layer is made of a rubber composition that emphasizes grip, wear resistance, slash resistance, heat resistance, and rolling resistance (for example, see Patent Documents 1-3).

[0004] In recent years, the production of solid tires, as described above, has required quality management and historical record management for each product. However, currently, no specific solution has been proposed for efficiently managing the quality and historical records of each product in solid tires.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 10-147107

[0008] Patent Document 2: Japanese Patent Application Publication No. 2010-163123

[0009] Patent Document 3: Japanese Patent Application Publication No. 2016-117296 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] The purpose of this invention is to provide a solid tire with an RFID tag for product identification, which ensures the protective effect of the RFID tag and provides good response accuracy, as well as a method for manufacturing the tire.

[0012] Technical means to solve the problem

[0013] To achieve the above objectives, the solid tire of the present invention comprises a tread rubber layer on the tread side and a base rubber layer on the rim side, and has a side extending radially from the tread rubber layer to the base rubber layer. The solid tire is characterized in that an RFID tag is embedded inside the solid tire, the RFID tag is disposed near the side, and the distance between the RFID tag and the side is in the range of 0.5 mm to 10.0 mm.

[0014] Furthermore, the solid tire manufacturing method (first method) of the present invention is a method for manufacturing the above-mentioned solid tire, characterized in that, when forming an uncured tire by winding a rubber sheet in multiple layers, an RFID tag is inserted between the layers of the rubber sheet in the middle of the multi-layer winding, and then the uncured tire with the RFID tag is vulcanized in a mold.

[0015] Furthermore, the solid tire manufacturing method (second method) of the present invention is a method for manufacturing the aforementioned solid tire, characterized in that, after forming an uncured tire by winding a rubber sheet in multiple layers, an RFID tag is attached to the side of the uncured tire, and then a covering layer made of uncured rubber with a thickness of 0.5 mm to 10 mm is superimposed on the RFID tag, and then the uncured tire with the RFID tag is vulcanized in a mold.

[0016] Invention Effects

[0017] In this invention, a solid tire having a tread rubber layer on the tread side and a base rubber layer on the rim side, and having a sidewall extending radially from the tread rubber layer to the base rubber layer, has an RFID tag embedded inside the solid tire for product identification. Therefore, the RFID tag can be used for quality management and historical record management of each product. Furthermore, the RFID tag is positioned near the sidewall, thus ensuring its protective effect and providing good response accuracy.

[0018] In particular, the distance between the RFID tag and the side is in the range of 0.5mm to 10.0mm, which can fully ensure the protective effect of the RFID tag and achieve good response accuracy.

[0019] In this invention, it is preferable that the RFID tag is embedded in a manner substantially parallel to the side. This improves the response accuracy of the RFID tag.

[0020] Preferably, the RFID tag is disposed in a solid tire, near the outer side of the vehicle during installation. This improves the ease of communication with the RFID tag.

[0021] Preferably, the RFID tag is embedded within the base rubber layer. This improves the protective effect of the RFID tag.

[0022] Preferably, when the RFID tag is embedded within the base rubber layer, the RFID tag is positioned away from the rim friction area, which is defined as being within a range of -15% to +15% of the rim flange height, centered on the apex of the rim flange. This ensures sufficient protection for the RFID tag even when rim friction occurs with a solid tire. The rim flange height refers to the radial height of the rim from its diameter position within the specified rim to the apex of the rim flange. The specified rim refers to the rim that specifies the tire's dimensions for each tire within a specification system that includes the tire's specifications; for example, it is an applicable rim for JATMA. Furthermore, the dimensions of the applicable rims for JATMA are specified in JIS-D6402, "Wheels for Industrial Vehicles and Construction Vehicles – Rim Profiles".

[0023] Preferably, short fibers are incorporated into the rubber composition constituting the base rubber layer. This suppresses deformation of the base rubber layer and improves the protective effect of the RFID tag. Furthermore, by incorporating short fibers into the rubber composition constituting the base rubber layer, rim friction is suppressed, thus also improving the protective effect of the RFID tag from this perspective. Preferably, the short fibers contain 1 phr to 10 phr (relative to 100 parts by weight of rubber) of vinylon fiber, with a fiber length of 2 mm to 10 mm and a fiber diameter of 5 μm to 50 μm.

[0024] Preferably, the RFID tag is coated with an adhesive. This improves the adhesion between the RFID tag and the rubber, thereby preventing tire failures caused by peeling between the RFID tag and the rubber.

[0025] Preferably, the RFID tag is coated with polyphenylene sulfide resin. Coating the RFID tag with heat-resistant polyphenylene sulfide resin improves its durability.

[0026] Preferably, the RFID tag is coated with ceramic. By coating the RFID tag with ceramic, which has heat resistance and rigidity, the durability of the RFID tag can be improved.

[0027] Preferably, the RFID tag is covered by multiple reinforcing fiber cords. Alternatively, preferably, the RFID tag is covered by reinforcing fabric. Covering the RFID tag with reinforcing fiber cords or reinforcing fabric improves the durability of the RFID tag.

[0028] According to the method for manufacturing a solid tire of the present invention (first method), when forming an uncured tire by winding a rubber sheet in multiple layers, an RFID tag is inserted between the layers of the rubber sheet midway through the winding process. This allows the RFID tag to be embedded in a desired location within the solid tire. Specifically, when winding the rubber sheet in multiple layers, the winding position of the rubber sheet in the radial direction of the uncured tire is calculated based on the winding length and thickness of the rubber sheet, and the RFID tag is inserted according to this winding position, thereby enabling high-precision embedding of the RFID tag.

[0029] Furthermore, according to the method for manufacturing a solid tire of the present invention (the second method), after the rubber sheet is wound in multiple layers to form an uncured tire, an RFID tag is attached to the side of the uncured tire, and then a covering layer made of uncured rubber with a thickness of 0.5 mm to 10 mm is superimposed on the RFID tag, thereby enabling the RFID tag to be embedded in the desired position of the solid tire. Attached Figure Description

[0030] Figure 1 This is a radial cross-sectional view showing a solid tire constructed according to an embodiment of the present invention.

[0031] Figure 2 It is a magnified cross-sectional view of a portion of the base rubber layer with embedded RFID tags.

[0032] Figure 3 It is a meridian cross-section diagram showing the rim friction area in a solid tire.

[0033] Figure 4 This is a radial cross-sectional view showing a solid tire constructed according to other embodiments of the present invention.

[0034] Figure 5 This is a radial cross-sectional view showing a solid tire constructed according to another embodiment of the present invention.

[0035] Figure 6 It is a magnified cross-sectional view of a portion of the base rubber layer containing short fibers.

[0036] Figure 7 (a)~ Figure 7 (e) are cross-sectional views representing improved examples of RFID tags.

[0037] Figure 8 (a)~ Figure 8 (b) is a cross-sectional view showing other improved examples of RFID tags.

[0038] Figure 9 This is a radial cross-sectional view showing a method for manufacturing a solid tire according to an embodiment of the present invention.

[0039] Figure 10 This is a radial cross-sectional view showing a method for manufacturing a solid tire according to other embodiments of the present invention.

[0040] Figure 11 This is a radial cross-sectional view showing a solid tire constructed according to another embodiment of the present invention.

[0041] Figure 12 It means Figure 11 Meridional cross-section of the manufacturing method of solid tires shown.

[0042] Figure 13 It is a top view that roughly represents the test route. Detailed Implementation

[0043] Hereinafter, the structure of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 This is a diagram showing a solid tire (pneumatic buffer tire for industrial vehicles) constructed according to an embodiment of the present invention.

[0044] like Figure 1 As shown, the solid tire 10 of this embodiment is annular and includes a tread rubber layer 1 located on the tread side (outer radial side of the tire) and a base rubber layer 2 located on the rim side (inner radial side of the tire). Furthermore, the solid tire 10 has a side surface S extending radially from the tread rubber layer 1 to the base rubber layer 2.

[0045] The tread rubber layer 1 is composed of a rubber composition primarily composed of diene-based rubbers such as natural rubber, styrene-butadiene rubber, and butadiene rubber. Carbon black and silica can be added as reinforcing agents to the rubber composition constituting the tread rubber layer 1. In the case of silica, organosilane coupling agents can also be added. Examples of organosilane coupling agents include bis-(triethoxysilylpropyl)tetrasulfide (TESPT). Furthermore, the rubber composition constituting the tread rubber layer 1 may also contain other commonly used compounding agents.

[0046] The JIS-A hardness of the tread rubber layer 1 is not particularly limited, but is preferably in the range of 50 to 75. If the JIS-A hardness of the tread rubber layer 1 is below 50, the radial deformation of the tire becomes too large and the lateral stiffness becomes too small due to the reduction in rigidity. Conversely, if the JIS-A hardness of the tread rubber layer 1 exceeds 75, the radial deformation of the tire becomes smaller due to the increase in rigidity, resulting in reduced vibration absorption and deteriorated ride comfort. It should be noted that the JIS-A hardness in this invention is the indicated hardness measured using a type A durometer at a temperature of 23°C according to JIS-K6253.

[0047] The base rubber layer 2 is composed of a rubber composition primarily composed of diene-based rubbers such as natural rubber, styrene-butadiene rubber, styrene-butadiene rubber, and butadiene rubber. Carbon black and phenolic resin can be added to the rubber composition constituting the base rubber layer 2 as reinforcing agents, and hexamethylenetetramine or similar substances can be added as curing agents for the phenolic resin. Furthermore, the rubber composition constituting the base rubber layer 2 may also contain other commonly used compounding agents.

[0048] The JIS-A hardness of the base rubber layer 2 is not particularly limited, but is preferably 80 or higher. If the JIS-A hardness of the base rubber layer 2 is lower than 80, the radial deformation of the tire becomes too large and the lateral rigidity becomes too small due to the reduction in rigidity. Furthermore, if the rigidity of the base rubber layer 2 is insufficient, rim friction caused by the contact between the base rubber layer 2 and the rim flange is likely to occur during driving.

[0049] Inside the base rubber layer 2, two or more bead cores 3 are arranged in a continuous ring along the tire circumference. These bead cores 3 are symmetrically arranged with respect to the tire equator. The bead cores 3 can be formed by winding multiple bead wires multiple times (so-called stranded bead wires), by winding a single bead wire multiple times, or by forming a single steel ring. To ensure adhesion between the bead core 3 and the base rubber layer 2, when using bead wires, a zinc plating or a brass plating of tin and copper is usually applied to its surface; when using steel rings, various vulcanizing adhesives are usually applied to their surface. Alternatively, short fibers can be incorporated into the rubber composition constituting the base rubber layer 2 instead of the bead core 3. If desired, short fibers can also be incorporated into the rubber composition constituting the base rubber layer 2 while simultaneously providing the bead core 3. Such short fibers can be made of organic fibers such as nylon, polyester, rayon, aramid, and vinylon.

[0050] In the aforementioned solid tire 10, an RFID tag 11 is embedded inside, and the RFID tag 11 is positioned near the side S. Figure 1 In this solid tire 10, RFID tags 11 are embedded in multiple locations, but it is sufficient to embed an RFID tag 11 in at least one location of the solid tire 10. The structure of the RFID tag 11 is not particularly limited, but passive RFID tags are primarily used. Such an RFID tag 11 has an IC substrate for storing data and an antenna for transmitting and receiving data in a non-contact manner, for example, formed as a rectangular or rectangular sheet with one side length of 7mm to 50mm. Regarding the RFID tag 11, a suitable RFID tag 11 is selected based on the tire size and the required sensitivity. Furthermore, since the RFID tag 11 is exposed to high temperatures during vulcanization, a heat-resistant type is preferred.

[0051] In a solid tire 10, which has a tread rubber layer 1 on the tread side and a base rubber layer 2 on the rim side, and has a sidewall S extending radially from the tread rubber layer 1 to the base rubber layer 2, an RFID tag 11 for product identification is embedded inside the solid tire 10. Therefore, the RFID tag 11 can be used for quality management and historical record management of each product. That is, the identification number stored in the RFID tag 11 can be associated with manufacturing conditions for quality management, or the identification number stored in the RFID tag 11 can be used to ensure traceability after leaving the factory. Furthermore, the RFID tag 11 is positioned near the sidewall S, thus ensuring the protective effect of the RFID tag 11 and achieving good response accuracy.

[0052] In the aforementioned solid tire 10, such as Figure 2 As shown, the distance T between the RFID tag 11 (especially the antenna portion) and the side S is in the range of 0.5 mm to 10.0 mm. This ensures sufficient protection for the RFID tag 11, allows for normal data reading, and provides good response accuracy. However, if the distance T between the RFID tag 11 and the side S is less than 0.5 mm, the RFID tag 11 may become exposed if damage or wear occurs to the side S of the solid tire 10 during driving. Conversely, if the distance T exceeds 10.0 mm, the reading accuracy of the RFID tag 11 tends to decrease. Ideally, the distance T between the RFID tag 11 and the side S is in the range of 0.5 mm to 6.0 mm.

[0053] In the aforementioned solid tire 10, it is preferable to embed the RFID tag 11 in a manner approximately parallel to the side surface S. This improves the response accuracy of the RFID tag 11. It should be noted that the approximately parallel state of the RFID tag 11 to the side surface S refers to an angle between the sheet-like RFID tag 11 and the side surface S within ±20°. If this angle is outside the ±20° range, there is a tendency for reduced receiving sensitivity.

[0054] In the solid tire 10 described above, it is preferable that the RFID tag 11 is positioned near the side of the solid tire 10 that becomes the outer side of the vehicle when mounted on the vehicle. In this case, with the solid tire 10 mounted on the vehicle, the RFID tag 11 is positioned on the outer side of the vehicle, thus improving the convenience of communication with the RFID tag 11. In solid tires 10 where the mounting direction relative to the vehicle is specified (displayed), the RFID tag 11 is positioned near the side that becomes the outer side of the vehicle in this specified mounting state.

[0055] It is preferable to embed the RFID tag 11 within the base rubber layer 2. By embedding the RFID tag 11 within the relatively hard base rubber layer 2, the protective effect of the RFID tag 11 can be fully ensured, enabling long-term quality management and historical record management for each product.

[0056] Figure 3 This is a diagram showing the rim friction area in a solid tire. When the RFID tag 11 is positioned near the side S of the base rubber layer 2, it is preferable that the RFID tag 11 is positioned to detach from the rim friction area X. That is, as... Figure 3 As shown, the solid tire 10 is assembled onto the rim R during use. However, under harsh operating conditions such as rapid acceleration, sudden braking, and sharp turns, wear and damage caused by rim friction can easily occur near the apex of the rim flange F. Therefore, the RFID tag 11 is positioned at a location detached from the rim friction area X. The rim friction area X is defined as being within a range of -15% to +15% of the rim flange height H, centered on the apex of the rim flange F. This ensures sufficient protection for the RFID tag 11 even when the solid tire 10 experiences rim friction. For example, in... Figure 3 In this context, the RFID tag 11A, which is located radially inner to the rim friction area X, and the RFID tag 11C, which is located radially outer to the rim friction area X, are less prone to damage compared to the RFID tag 11B located within the rim friction area X.

[0057] Figure 4 This diagram illustrates a solid tire constructed according to other embodiments of the present invention. It should be noted that... Figure 4 In the middle, to and Figure 1 The embodiments shown have the same components and are labeled with the same reference numerals, and detailed descriptions are omitted. Figure 4 In the solid tire 10, an RFID tag 11 is embedded inside. The RFID tag 11 is positioned near the side S, but its orientation is different from that of the solid tire 10. Figure 1 The implementation methods differ. That is, the sheet-like RFID tag 11 is embedded in a manner oriented along the tire's axial direction, thus intersecting with the sidewall S of the solid tire 10. Such an orientation is also possible.

[0058] Figure 5 This diagram illustrates a solid tire constructed according to another embodiment of the present invention. It should be noted that... Figure 5 In the middle, to and Figure 1 The embodiments shown have the same components and are labeled with the same reference numerals, and detailed descriptions are omitted. Figure 5In this solid tire 10, a cushioning intermediate rubber layer 4 is inserted between the tread rubber layer 1 and the base rubber layer 2. By adding such an intermediate rubber layer 4, heat generation of the tread rubber layer 1 can be suppressed, or the wear resistance of the tread rubber layer 1 can be improved. As the rubber composition constituting the intermediate rubber layer 4, it is preferable to use a rubber composition that is softer than the tread rubber layer 1 and the base rubber layer 2 and has a low loss tangent tanδ. Furthermore, the intermediate rubber layer 4 can be not only one layer, but also two or more layers. In this way, in a solid tire 10 having a tread rubber layer 1 on the tread side, a base rubber layer 2 on the rim side, and an intermediate rubber layer 4 located between the two, an RFID tag 11 is embedded near the sidewall S of at least one of the tread rubber layer 1, the base rubber layer 2, and the intermediate rubber layer 4.

[0059] In the aforementioned solid tire 10, such as Figure 6 As shown, it is preferable to incorporate short fibers 5 into the rubber composition constituting the base rubber layer 2. This suppresses deformation of the base rubber layer 2 and improves the protective effect of the RFID tag 11. Furthermore, by incorporating short fibers 5 into the rubber composition constituting the base rubber layer 2, rim friction can be suppressed, thus also improving the protective effect of the RFID tag 11 from this perspective. It should be noted that when the rubber sheet containing short fibers 5 is output, there is a tendency for the short fibers 5 to be oriented along the sheet output direction. Therefore, in the base rubber layer 2, the short fibers 5 are preferably oriented along the tire circumferential direction. In this way, by oriented the short fibers 5 of the base rubber layer 2 along the tire circumferential direction, a rim-hugging effect can be effectively achieved, which not only improves the effect of preventing rim slippage but also increases the longitudinal and lateral rigidity of the tire.

[0060] The short fiber 5 is not particularly limited, but for example, it can contain 1 to 10 phr of vinylon fiber with a fiber length of 2 mm to 10 mm and a fiber diameter of 5 μm to 50 μm. Such vinylon fiber is suitable as a reinforcing material for the base rubber layer 2. Here, if the amount of vinylon fiber is less than 1 phr, the modulus in the low tensile region becomes smaller, the rigidity of the base rubber layer 2 decreases, and it becomes more prone to bending, thus reducing the protective effect of the RFID tag 11. Conversely, if the amount of vinylon fiber exceeds 10 phr, the modulus in the low tensile region becomes too large, thus deteriorating the rim assembly performance. Furthermore, if the fiber length is less than 2 mm, the modulus in the low tensile region becomes smaller, thus reducing the protective effect of the RFID tag 11. Conversely, if the fiber length exceeds 10 mm, the modulus in the low tensile region becomes too large, thus deteriorating the rim assembly performance. Furthermore, if the fiber diameter is less than 5 μm, the dispersibility of short fibers decreases during rubber compounding. Conversely, if the fiber diameter exceeds 50 μm, the modulus of the low tensile region decreases due to the reduced specific surface area of ​​the vinylon fibers, thus reducing the protective effect of the RFID tag 11. In addition, if the fiber diameter is too large, it becomes a foreign object and is therefore not preferred.

[0061] Figure 7 (a)~ Figure 7 (e) are diagrams illustrating improved examples of RFID tags. Figure 7 In (a), the RFID tag 11 is covered by an adhesive layer 12 made of adhesive. This improves the adhesion between the RFID tag 11 and the rubber, thereby preventing tire failures caused by peeling between the RFID tag 11 and the rubber. For example, vulcanizing adhesives such as Chemlok 6150 manufactured by Lord Corporation can be used.

[0062] exist Figure 7 In (b), the RFID tag 11 is covered by a resin layer 13 made of polyphenylene sulfide resin. By covering the RFID tag 11 with heat-resistant polyphenylene sulfide resin, the durability of the RFID tag 11 can be improved.

[0063] exist Figure 7 In (c), the RFID tag 11 is covered by a resin layer 13 made of polyphenylene sulfide resin, and the resin layer 13 is further covered by an adhesive layer 12 made of adhesive. In this case, both the adhesion and heat resistance of the RFID tag 11 can be improved.

[0064] exist Figure 7 In (d), the RFID tag 11 is covered by a ceramic layer 14 made of ceramic. By covering the RFID tag 11 with a ceramic layer that is heat-resistant and rigid, the durability of the RFID tag 11 can be improved.

[0065] exist Figure 7 In (e), the RFID tag 11 is covered by a ceramic layer 14, which is made of ceramic, and then the ceramic layer 14 is covered by an adhesive layer 12 made of adhesive. In this case, the adhesion, heat resistance, and rigidity of the RFID tag 11 can be improved simultaneously. It should be noted that, as an adhesive, Chemlok's AP134 (primer) or 6125 (coating) are preferably used on the ceramic layer side.

[0066] Figure 8 (a)~ Figure 8 Figure (b) shows improved examples of RFID tags. Figure 8 In (a), the RFID tag 11 is covered by multiple reinforcing fiber cords 15. The reinforcing fiber cords 15 are, for example, fabric curtains. Covering the RFID tag 11 with reinforcing fiber cords 15 improves the durability of the RFID tag 11. Furthermore, covering it with reinforcing fiber cords 15 improves the adhesion between the RFID tag 11 and rubber. In particular, it is preferable to cover the RFID tag 11 with reinforcing fiber cords 15 after applying a vulcanized adhesive.

[0067] exist Figure 8 In (b), the RFID tag 11 is covered with a reinforcing fabric 16. Covering the RFID tag 11 with the reinforcing fabric 16 improves the durability of the RFID tag 11. Furthermore, covering it with the reinforcing fabric 16 enhances the adhesion between the RFID tag 11 and the rubber. In particular, it is preferable to cover the RFID tag 11 with the reinforcing fabric 16 after applying a vulcanized adhesive.

[0068] Figure 9 This diagram illustrates a method for manufacturing a solid tire (first method) according to an embodiment of the present invention. Figure 9 In this context, D is a scalable cylindrical forming drum. In the manufacture of the aforementioned solid tire 10, as... Figure 9 As shown, an uncured tire 10X is formed by winding a rubber sheet 20 in multiple layers around a forming drum D. At this time, by inserting an RFID tag 11 between the layers of the rubber sheet 20 midway through the multi-layer winding, the RFID tag 11 can be embedded in the desired location of the solid tire 10. Figure 9 In this process, the RFID tag 11 is embedded in the tread rubber layer 1 and / or the base rubber layer 2. In this way, the uncured tire 10X with the embedded RFID tag 11 is vulcanized in a mold having a cavity corresponding to the shape of the solid tire 10.

[0069] In the above-described method for manufacturing the solid tire 10, when the rubber sheet 20 is wound in multiple layers, the outer diameter of the forming drum D is used as a reference. Based on the winding length and thickness of the rubber sheet 20, the winding position of the rubber sheet 20 in the radial direction of the uncured tire 10X is calculated, and the RFID tag 11 is inserted according to this winding position. That is, the RFID tag 11 can be inserted only in the middle of the multi-layer winding. Specifically, winding can be temporarily stopped at the stage of reaching the specified position, the RFID tag 11 can be set, and then winding can be resumed. When inserting multiple RFID tags 11, this operation can be performed multiple times. Furthermore, for example, in a two-layer tire of size 5.00-8, the width of the base rubber sheet is 120 mm and the thickness is 8 mm. After winding four layers of base rubber sheet, the winding is temporarily stopped, the RFID tag 11 is set, and then two more layers of base rubber sheet are wound. Then, the winding height of the entire tread rubber sheet is 110 mm to complete the uncured tire 10X. If the product is manufactured by vulcanizing it using a specified mold, the RFID tag 11 is embedded at approximately 200% of the flange height H. This allows for precise embedding of the RFID tag 11. Furthermore, by calculating the winding position of the rubber sheet 20 in the radial direction of the unvulcanized tire 10X based on the winding length and thickness of the rubber sheet 20, and inserting the RFID tag 11 according to this winding position, the insertion of the RFID tag 11 can be automated.

[0070] Figure 10 This is a diagram illustrating a method for manufacturing a solid tire (second method) according to other embodiments of the present invention. Figure 10 In this context, D is a scalable cylindrical forming drum. In the manufacture of the aforementioned solid tire 10, as... Figure 10 As shown, after the rubber sheet 20 is wound in multiple layers around the forming drum D to form an uncured tire 10X, an RFID tag 11 is attached to the side of the uncured tire 10X. Figure 10 In this process, the RFID tag 11 is affixed to the portion corresponding to the tread rubber layer 1 and / or the base rubber layer 2. Furthermore, a covering layer 21 of uncured rubber with a thickness of 0.5 mm to 10 mm is superimposed on the RFID tag 11, thereby embedding the RFID tag 11 in the desired location on the solid tire 10. In this way, the uncured tire 10X with the RFID tag 11 embedded is vulcanized in a mold having a cavity corresponding to the shape of the solid tire 10.

[0071] In this invention, as long as the solid tire has a tread rubber layer on the tread side and a base rubber layer on the rim side, and has a side extending radially from the tread rubber layer to the base rubber layer, the structure of the solid tire is not particularly limited. For example, a structure in which additional reinforcing members made of steel, organic fibers, and high-hardness rubber are embedded in the solid tire, or a structure in which additional cushioning members made of low-hardness rubber are embedded in the solid tire, can also be used.

[0072] Figure 11 This diagram illustrates a solid tire constructed according to another embodiment of the present invention. It should be noted that... Figure 11 In the middle, to and Figure 1 The embodiments shown have the same components labeled with the same reference numerals, and detailed descriptions are omitted. Figure 11 The solid tire 10 includes a tread rubber layer 1 on the tread side and a base rubber layer 2 on the rim side. It also includes a pair of bead cores 3 disposed on the outer side of the base rubber layer 2 in the width direction, a sidewall rubber layer 6 made of rubber extending radially outward from each bead core 3, and a fiber reinforcement layer 7 embedded in the sidewall rubber layer 6 in a manner extending radially outward from each bead core 3. This assembly of bead cores 3, sidewall rubber layers 6, and fiber reinforcement layers 7 is generally referred to as a sidewall. Furthermore, a cover rubber layer 8 is provided on the outer side of the sidewall in the tire width direction, which is composed of bead cores 3, sidewall rubber layers 6, and fiber reinforcement layers 7. It should be noted that the sidewall rubber layer 6 may be omitted. In this case, the opposing fiber reinforcement layers 7 are directly bonded to each other, remaining as is. The presence or absence of the sidewall rubber layer 6 and the properties of its rubber are determined by the tire's size, performance, etc. In a solid tire 10 constructed in this way, an RFID tag 11 can also be embedded within it. It should be noted that the bead core 3 can also be embedded in the base rubber layer 2, in which case the effect of suppressing rim slippage can be improved.

[0073] Figure 12 It means Figure 11 A diagram illustrating the manufacturing process of a solid tire. Figure 12 In this context, D is a scalable cylindrical forming drum. In the manufacture of the aforementioned solid tire 10, as... Figure 12As shown, after the rubber sheet 20 is wound in multiple layers around the forming drum D, a sidewall consisting of a bead core 3, a sidewall rubber layer 6, and a fiber reinforcement layer 7 is installed on the laminate of the rubber sheet 20 from both sides in the tire width direction. Then, a cover rubber layer 8 is installed from the outside of the sidewall to form an uncured tire 10X. At this time, for example, an RFID tag 11 is inserted between the sidewall rubber layer 6 and the cover rubber layer 8. Alternatively, the RFID tag 11 can be embedded either between the opposing fiber reinforcement layers 7 or inside the sidewall rubber layer 6 in the tire width direction. Thus, the RFID tag 11 can be embedded at the desired location in the solid tire 10.

[0074] Example

[0075] In an industrial vehicle pneumatic buffer tire with a tire size of 5.00-8, having a tread rubber layer on the tread side and a base rubber layer on the rim side, and having a sidewall extending radially from the tread rubber layer to the base rubber layer, an RFID tag was embedded inside the solid tire (specifically the base rubber layer), and various test tires (Comparative Examples 1-3 and Examples 1-10) were manufactured with different distances between the sidewall of the solid tire and the RFID tag.

[0076] In Comparative Examples 1-3 and Examples 1-10, the fit of the base rubber layer, the JIS-A hardness of the tread rubber layer, the JIS-A hardness of the base rubber layer, and the distance between the RFID tag and the sidewall are shown in Table 1. Four bead cores were embedded in the base rubber layer of each test tire. As RFID tags, passive RFID tags (Kyocera Corporation fine ceramic tag type A) with dimensions of 5mm × 15mm × 1.7mm were used, and were embedded at (A) 30% of the rim flange height, (B) 100% of the rim flange height, and (C) 200% of the rim flange height (refer to...). Figure 3 In addition, the CAINWAY SR7 is used as the reader for reading RFID tags.

[0077] For these test tires, the response accuracy of the RFID tags was evaluated using the following test method. Specifically, a "○" was used to indicate that the RFID could be read from a position 20 cm axially away from the base rubber layer; a "Δ" was used to indicate that the RFID could be read from a position 10 cm axially away from the base rubber layer; and a "×" was used to indicate that the RFID could not be read from a position 10 cm axially away from the base rubber layer. The results are shown in Table 1.

[0078] In addition, the test tire underwent the following real-vehicle test. Specifically, the test tire was mounted on an 8×3.00D rim and attached to the left and right rear wheels of a forklift. The load was set to 500 kg, and the vehicle was driven for 100 hours at a speed of 8.8 km / h on a test track consisting of a dry, flat concrete surface. The test route was... Figure 13 The loop shown is 56m long. It should be noted that the daily driving time was set to 5 hours, and the test was conducted intermittently. After the test, the rim friction width formed on the side of the base rubber layer was measured, and the ratio (%) of the rim friction width to the rim flange height was calculated. In addition, the RFID tags (A, B, C) embedded in the base rubber layer were subjected to operation verification tests. Cases confirmed as normal operation were indicated by "○", and cases without operation were indicated by "×". The results are shown in Table 1.

[0079] [Table 1]

[0080]

[0081] As shown in Table 1, in the tires of Examples 1-10, the RFID tag response accuracy was excellent before the driving test, and at least the RFID tag at position A operated normally after the driving test. In contrast, in the tires of Comparative Examples 1-2, the distance between the RFID tag and the sidewall was too small, so none of the RFID tags operated after the driving test. In particular, in the tire of Comparative Example 1, the RFID tag at position C was exposed during driving due to tire flexing. Furthermore, in the tire of Comparative Example 3, the distance between the RFID tag and the sidewall was too large, resulting in poor RFID tag response accuracy.

[0082] Next, in an industrial vehicle pneumatic buffer tire with a tire size of 5.00-8, having a tread rubber layer on the tread side and a base rubber layer on the rim side, and having a sidewall extending radially from the tread rubber layer to the base rubber layer, an RFID tag was embedded inside a solid tire (specifically, the base rubber layer). The distance between the sidewall of the solid tire and the RFID tag was set to 2.0 mm. Various test tires (Examples 11-18) were manufactured with different amounts of short fibers in the rubber composition constituting the base rubber layer. As the short fiber, vinylon fiber (vinylon fiber 1) with a fiber length of 4 mm and a fiber diameter of 12 μm or vinylon fiber (vinylon fiber 2) with a fiber length of 8 mm and a fiber diameter of 24 μm were used.

[0083] In Examples 11-18, the fit of the base rubber layer, the JIS-A hardness of the tread rubber layer, the JIS-A hardness of the base rubber layer, and the modulus of the base rubber layer at 10% elongation are shown in Table 2. Four bead cores were embedded in the base rubber layer of each test tire. As RFID tags, passive RFID tags (Kyocera Corporation Fine Ceramic Tag Type A) with dimensions of 5mm × 15mm × 1.7mm were used. The distance between the RFID tag and the side of the base rubber layer was set to 2.0mm, and the tags were embedded at (A) 30% of the rim flange height, (B) 100% of the rim flange height, and (C) 200% of the rim flange height (refer to...). Figure 3 In addition, the CAINWAY SR7 is used as the reader for reading RFID tags.

[0084] For these test tires, the response accuracy of the RFID tags was evaluated in the same manner as above, and the rim friction width ratio (%) was calculated after actual vehicle testing. Action verification tests were then performed on the RFID tags (A, B, C). However, the driving time was set to 1.2 times that of the tests in Table 1. The results are shown in Table 2.

[0085] [Table 2]

[0086]

[0087]

[0088] As can be seen from Table 2, in the tires of Examples 11 to 18, the RFID tags had excellent response accuracy before the driving test, and all RFID tags operated normally after the driving test.

[0089] Explanation of reference numerals in the attached figures

[0090] 1: Tread rubber layer;

[0091] 2: Base rubber layer;

[0092] 3: Tire bead core;

[0093] 4: Intermediate rubber layer;

[0094] 5: Short fibers;

[0095] 10: Solid tires;

[0096] 10X: Uncured tires;

[0097] 11: RFID tags;

[0098] 12: Adhesive layer;

[0099] 13: Resin layer;

[0100] 14: Ceramic layer;

[0101] 15: Reinforced fiber cords;

[0102] 16: Reinforcing fabric;

[0103] 20: Rubber sheet;

[0104] 21: Covering layer;

[0105] R: Wheel rim;

[0106] F: Rim flange.

Claims

1. A solid tire comprising a tread rubber layer on a tread side and a base rubber layer on a rim side in contact with the rim flange, and having a sidewall extending radially from the tread rubber layer to the base rubber layer, characterized in that... An RFID tag is embedded inside the solid tire. The RFID tag is positioned near the side. The distance between the RFID tag and the side is in the range of 0.5mm to 10.0mm. The RFID tag is embedded in the base rubber layer. The RFID tag is positioned at a point where it detaches from the rim friction area, which is defined as being within a range of -15% to +15% of the rim flange height, centered on the apex of the rim flange. Short fibers are incorporated into the rubber composition constituting the base rubber layer. Vinylon fibers containing 1 phr to 10 phr are used as the short fibers, wherein the fiber length of the vinylon fibers is 2 mm to 10 mm and the fiber diameter is 5 µm to 50 µm.

2. The solid tire according to claim 1, characterized in that, The RFID tag is embedded in a manner that is substantially parallel to the side.

3. The solid tire according to claim 1 or 2, characterized in that, The RFID tag is disposed in the solid tire near the side of the vehicle's outer side when the vehicle is mounted.

4. The solid tire according to claim 1 or 2, characterized in that, The RFID tag is coated with adhesive.

5. The solid tire according to claim 1 or 2, characterized in that, The RFID tag is coated with polyphenylene sulfide resin.

6. The solid tire according to claim 1 or 2, characterized in that, The RFID tag is coated with ceramic.

7. The solid tire according to claim 1 or 2, characterized in that, The RFID tag is covered by multiple reinforcing fiber cords.

8. The solid tire according to claim 1 or 2, characterized in that, The RFID tag is covered with reinforced fabric.

9. A method for manufacturing a solid tire, comprising a method for manufacturing a solid tire as described in any one of claims 1 to 8, characterized in that, When forming an uncured tire by winding multiple layers of rubber sheet, an RFID tag is inserted between the layers of the rubber sheet midway through the winding process. Then, the uncured tire with the RFID tag is vulcanized in a mold.

10. The method for manufacturing a solid tire according to claim 9, characterized in that, When the rubber sheet is wound in multiple layers, the winding position of the rubber sheet in the radial direction of the uncured tire is calculated based on the winding length and thickness of the rubber sheet, and an RFID tag is inserted according to the winding position.

11. A method for manufacturing a solid tire, comprising the method for manufacturing a solid tire as described in any one of claims 1 to 8, characterized in that, After the rubber sheet is wound in multiple layers to form an uncured tire, an RFID tag is attached to the side of the uncured tire. Then, a covering layer of uncured rubber with a thickness of 0.5 mm to 10 mm is superimposed on the RFID tag. Finally, the uncured tire with the RFID tag is vulcanized in a mold.

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