Solid tire

Abstract

To provide a solid tire capable of improving durability of an electronic component.SOLUTION: There is provided a solid tire 1. The solid tire 1 includes a ground surface 4s, a first side surface 7 which is continued to one side in a tire axial direction of the ground surface 4s and extends in a tire radial direction, and an electronic component 11. The electronic component 11 is fixed onto the first side surface 7.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solid tire. [Background technology]

[0002] 2. Description of the Related Art Various solid tires to be mounted on industrial vehicles such as forklifts have been proposed in the past (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-025552 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the provision of electronic components inside solid tires has been considered in order to monitor the usage history and condition of the tires. However, solid tires are used under a large load, which causes a large distortion inside the tire, and there is a problem that the electronic components provided inside the tire are easily damaged.

[0005] The present invention has been devised in view of the above circumstances, and has as its main object to provide a solid tire capable of improving the durability of electronic components. [Means for solving the problem]

[0006] The present invention is a solid tire including a ground contact surface, a first side surface that is continuous with one side of the ground contact surface in the tire axial direction and extends in the tire radial direction, and an electronic component, the electronic component being fixed onto the first side surface. Effect of the Invention

[0007] The solid tire of the present invention has the above-mentioned configuration, and thus can improve the durability of electronic components. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing one embodiment of a solid tire of the present invention. [Diagram 2] FIG. 2 is an enlarged perspective view of the electronic component of FIG. [Diagram 3] 2 is an enlarged perspective view of a first side surface of FIG. 1. [Figure 4] 2 is an enlarged cross-sectional view of a first side surface of FIG. 1. [Diagram 5] FIG. 2 is a cross-sectional view of a solid tire according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The drawings are described to include the features of the present invention, but may include exaggerated expressions and expressions different from the dimensional ratios of the actual structure in order to facilitate understanding of the present invention. In addition, the same reference numerals are used to refer to the same or common elements throughout the embodiments, and duplicate explanations will be omitted.

[0010] FIG. 1 is a cross-sectional view of a solid tire 1 (hereinafter sometimes simply referred to as "tire") of this embodiment, including a rotation axis. As shown in FIG. 1, the tire 1 of this embodiment is mounted on an industrial vehicle (not shown), such as a forklift. The tire 1 of this embodiment may be mounted on either the driving wheels or the steering wheels of the industrial vehicle. In addition, as a desirable embodiment, the tire 1 of this embodiment is configured as a so-called pneumatic solid tire, which has an external shape similar to that of a pneumatic tire. However, the tire 1 of the present invention is not limited to this embodiment.

[0011] The tire 1 of this embodiment includes a plurality of rubber layers 2 stacked in the tire radial direction. The plurality of rubber layers 2 include a base rubber layer 3 having a contact surface 3s with the mounted rim R, and a tread rubber layer 4 having a ground contact surface 4s. However, the tire 1 of the present invention is not limited to this embodiment, and as described later, another rubber layer may be provided between the base rubber layer 3 and the tread rubber layer 4.

[0012] The tread rubber layer 4 has a pair of tread ends Te which are the axial ends of the contact surface 4s, and a tread width TW which is the axial length of the contact surface 4s in a normal state. The normal state refers to a state in which the tire 1 is mounted on a normal rim and is unloaded. In this specification, unless otherwise specified, the dimensions of each part of the tire are values ​​measured in the normal state.

[0013] "Genuine rim" is the rim that is specified for each tire by the standard system that includes the standard on which the tire is based, for example, "Standard Rim" for JATMA, "Design Rim" for TRA, "Measuring Rim" for ETRTO. If no standard is specified, the "genuine rim" is the rim recommended by the manufacturer that conforms to the above standard.

[0014] The contact surface 4s means a surface that comes into contact with a flat surface when a normal load is applied to the tire 1 in a normal state and the tire 1 is placed on the flat surface with a camber angle of 0°. When a standard is defined, the "normal load" is a load defined for each tire by each standard in a standard system including the standard on which the tire is based, and is the "maximum load capacity" in the case of JATMA, the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" in the case of TRA, and "LOAD CAPACITY" in the case of ETRTO. When no standard is defined, the "normal load" refers to the maximum load that can be applied when using the tire according to the above-mentioned standard.

[0015] A plurality of bead cores 6 extending in the tire circumferential direction are provided in the tire axial direction in the base rubber layer 3. Such bead cores 6 are useful for improving the fit with the mounted rim R.

[0016] The tire 1 includes a first side surface 7, a second side surface 8, and an electronic component 11. The first side surface 7 is continuous with one side of the ground contact surface 4s in the tire axial direction. The second side surface 8 is continuous with the other side of the ground contact surface 4s in the tire axial direction. The first side surface 7 and the second side surface 8 each extend from the tread end Te toward the inside in the tire radial direction. The first side surface 7 and the second side surface 8 each refer to the outer surface of the tire 1 from the tread end Te to the surface that contacts the mounting rim R.

[0017] FIG. 2 shows an enlarged perspective view of an electronic component 11. As shown in FIG. 2, the electronic component 11 is configured by covering a chip 12 including an electronic circuit with a cover rubber 13, and in this specification, the chip 12 and the cover rubber 13 are collectively referred to as the electronic component 11. Examples of the electronic component 11 include an RFID tag, a pressure sensor, a temperature sensor, an acceleration sensor, and a magnetic sensor. The electronic component 11 of this embodiment is an RFID tag. The RFID tag is a small and lightweight electronic component configured of a chip body 12a including a transmitting / receiving circuit, a control circuit, a memory, etc., and an antenna 12b. When the RFID tag receives a query radio wave, it uses the received radio wave as electric energy and transmits various data in the memory as a response radio wave. A known configuration is adopted for this RFID tag, and a detailed description thereof is omitted in this specification.

[0018] The electronic component 11 is configured by the cover rubber 13 into an elongated plate shape including long sides extending in the tire circumferential direction, short sides extending in the tire radial direction, and a thickness in the tire axial direction. In FIG. 1 and other figures, the cross section is shown without hatching. Note that the cover rubber 13 is configured of, for example, a rubber material different from that of the tire body. Specifically, the cover rubber 13 has a lower rubber hardness than the tire body. Note that in this specification, "rubber hardness" refers to a durometer A hardness measured at a standard temperature of 23±2°C using a durometer type A in accordance with JIS-K6253.

[0019] FIG. 3 shows an enlarged perspective view of the first side surface 7 in FIG. 1. FIG. 4 shows an enlarged cross-sectional view of the first side surface 7 in FIG. 1. As shown in FIG. 3 and FIG. 4, in the present invention, the electronic component 11 is fixed on the first side surface 7. As a result, compared with a conventional solid tire in which an electronic component is arranged inside the tire, in the tire 1 of the present invention, the strain inside the tire is less likely to act on the electronic component 11. Therefore, the durability of the electronic component 11 can be significantly improved. Note that the above-mentioned "fixing" means a mode in which the electronic component 11 is attached to the first side surface 7 by some kind of adhesive method, and means that the electronic component 11 and the rubber member constituting the first side surface 7 are not integrally vulcanized and molded. As the adhesion method, various methods such as a rubber-based or resin-based adhesive, industrial adhesive tape, etc. can be adopted.

[0020] A more detailed configuration of this embodiment will be described below. The configuration described below shows a specific embodiment of this embodiment. Therefore, it goes without saying that the present invention can achieve the above-mentioned effects even if it does not have the configuration described below. Furthermore, even if any one of the configurations described below is applied alone to the tire 1 of the present invention having the above-mentioned characteristics, an improvement in performance according to each configuration can be expected. Furthermore, when some of the configurations described below are applied in combination, a composite improvement in performance according to each configuration can be expected.

[0021] 1, the rubber hardness of the base rubber layer 3 is desirably, for example, 80 degrees or more, specifically, 80 to 90 degrees. The rubber hardness of the tread rubber layer 4 is desirably, for example, 65 degrees or more, specifically, 65 to 75 degrees. This improves the durability and ride comfort of the tire 1 in a well-balanced manner.

[0022] The tread rubber layer 4 constitutes a part of the first side surface 7 and the second side surface 8. Moreover, the electronic component 11 of this embodiment is fixed to the outer surface of the tread rubber layer 4 of the first side surface 7. This further improves the durability of the electronic component 11.

[0023] In a preferred embodiment, the electronic component 11 is located radially inward of the wear limit position of the tread rubber layer 4. This ensures a sufficient distance between the electronic component 11 and the road surface even when the tire 1 is worn to a certain extent, thereby preventing damage to the electronic component 11. The wear limit position of the tread rubber layer 4 corresponds to the position of the contact surface when the tire 1 is worn down to the limit at which normal use is possible.

[0024] If the electronic component 11 is close to the ground contact surface 4s, the electronic component 11 may come into contact with a protrusion on the road while the tire is running, or strain near the tread edge Te may act on the electronic component. From this point of view, in the tire cross section, the distance L1 in the tire radial direction from the tire radially innermost end 1i to the electronic component 11 is 90% or less of the tire cross-sectional height ht. Also, if the electronic component 11 is close to the mounting rim R, the communication function of the electronic component 11 may be impaired. From this point of view, the distance L1 is 30% or more of the tire cross-sectional height ht.

[0025] From the viewpoint of improving the durability of the electronic component 11, the distance L1 is preferably 35% or more, more preferably 40% or more, and preferably 60% or less, more preferably 50% or less of the tire cross-sectional height ht. Note that the distance refers to the distance in the tire radial direction from the innermost end 1i of the tire 1 to the center position of the electronic component 11 in the tire radial direction.

[0026] The first side surface 7 and the second side surface 8 of the tire 1 have a convex portion 15 including a tire maximum width position 14 that constitutes the maximum width in the tire axial direction. When the region with the maximum width has a length in the tire radial direction, the center position of the region in the tire radial direction becomes the tire maximum width position 14. As shown in FIG. 4, the electronic component 11 is preferably located radially inward of the tire maximum width position 14. This can effectively prevent the electronic component from coming into contact with a convex portion of the road or the like when the tire is running.

[0027] To ensure the above-mentioned effects, the distance L2 in the tire radial direction from the tire maximum width position 14 to the tire radial center position of the electronic component 11 is preferably 10% to 25% of the tire cross-sectional height ht (shown in FIG. 1).

[0028] The angle of the fixing surface 11a fixed to the first side surface 7 of the electronic component 11 with respect to the tire radial direction is preferably 10° or less. This makes it possible to prevent the electronic component 11 from being affected and to suppress damage to the electronic component 11 even if the protrusion 15 is deformed during use of the tire.

[0029] 1, in this embodiment, a plurality of lateral grooves 20 that open on the second side surface 8 and have discontinuous ends within the contact patch 4s are provided in the tire circumferential direction. On the other hand, the above-mentioned lateral grooves 20 are not arranged on the first side surface 7 side to which the electronic component 11 is fixed. This arrangement of the lateral grooves 20 suppresses deformation near the tread edge Te on the side closer to the electronic component 11, further improving the durability of the electronic component 11.

[0030] In this embodiment, the electronic component 11 is fixed to the first side surface 7, and the cover rubber 13 (shown in FIG. 2) included in the electronic component 11 is exposed to the outside. In another embodiment of the present invention, the electronic component 11 may be covered with a protective cover made of a material softer than the rubber material forming the first side surface 7 to which the electronic component 11 is fixed (not shown). For example, a resin film or a rubber film is appropriately used as the soft material. This can further suppress damage to the electronic component 11. The soft material means a material having a lower rigidity than the rubber material forming the first side surface 7. The rigidity between the two materials is compared, for example, by taking test pieces of the same shape from the two materials and comparing the magnitude of deformation when the same load is applied to these test pieces.

[0031] Fig. 5 is a tire cross-sectional view of a tire 1 according to another embodiment of the present invention. As shown in Fig. 5, the tire 1 according to this embodiment includes a center rubber layer 5 between the above-mentioned tread rubber layer 4 and base rubber layer 3. The center rubber layer 5 is configured to have a lower rubber hardness than the base rubber layer 3. In a desirable embodiment, the rubber hardness of the center rubber layer 5 is lower than the rubber hardness of the tread rubber layer 4. Specifically, the rubber hardness of the center rubber layer 5 is 60 to 65 degrees. This makes it possible to improve the wear resistance of the tread rubber layer 4 while suppressing heat generation in the tread rubber layer 4.

[0032] In this embodiment, the electronic component 11 is fixed onto the outer surface of the center rubber layer 5. This makes it difficult for vibrations occurring during tire rotation to affect the electronic component 11, thereby further improving the durability of the electronic component 11.

[0033] Although a particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment and can be modified in various ways.

[0034] [Note] The present invention includes the following aspects.

[0035] [Invention 1] A solid tire, The ground surface and a first side surface that is continuous with one side of the ground contact surface in the tire axial direction and extends in the tire radial direction; and an electronic component. The electronic component is fixed onto the first side surface. Solid tires. [Invention 2] 2. The solid tire according to claim 1, wherein in a cross section of the tire, a distance in the tire radial direction from the innermost end in the tire radial direction to said electronic component is 30% or more of a tire cross-sectional height. [Invention 3] 3. The solid tire according to claim 1 or 2, wherein in a cross section of the tire, a distance in the tire radial direction from the innermost end in the tire radial direction to said electronic component is 90% or less of a tire cross-sectional height. [Invention 4] a tread rubber layer including the ground contact surface, 4. The solid tire according to any one of claims 1 to 3, wherein the electronic component is located radially inward of a wear limit position of the tread rubber layer. [Invention 5] a tread rubber layer including the ground contact surface, The rubber hardness of the tread rubber layer is 65 degrees or more, 5. The solid tire according to any one of claims 1 to 4, wherein the electronic component is fixed to an outer surface of the tread rubber layer. [Invention 6] A solid tire according to any one of claims 1 to 5, wherein the electronic component is covered with a protective cover made of a material softer than the rubber material forming the first side surface to which the electronic component is fixed. [Invention 7] 7. The solid tire according to any one of claims 1 to 6, wherein the electronic component is located radially inward of the maximum width position of the tire. [Explanation of symbols]

[0036] 4s ground plane 7 First side surface 11 Electronic Components

Claims

1. A solid tire, The ground surface and a first side surface that is continuous with one side of the ground contact surface in the tire axial direction and extends in the tire radial direction; and an electronic component. The electronic component is fixed onto the first side surface. Solid tires.

2. 2. The solid tire according to claim 1, wherein in a tire cross section, a distance in the tire radial direction from an innermost end in the tire radial direction to said electronic component is 30% or more of a tire section height.

3. 3. The solid tire according to claim 2, wherein in a tire cross section, a distance in the tire radial direction from an innermost end in the tire radial direction to said electronic component is 90% or less of a tire section height.

4. a tread rubber layer including the ground contact surface, 4. The solid tire according to claim 1, wherein the electronic component is located radially inward of a wear limit position of the tread rubber layer.

5. a tread rubber layer including the ground contact surface, The rubber hardness of the tread rubber layer is 65 degrees or more, 4. The solid tire according to claim 1, wherein the electronic components are fixed to an outer surface of the tread rubber layer.

6. 4. The solid tire according to claim 1, wherein the electronic component is covered with a protective cover made of a material softer than a rubber material forming the first side surface to which the electronic component is fixed.

7. 4. The solid tire according to claim 1, wherein the electronic component is located radially inward of a maximum width position of the tire.

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