Solid tire

Abstract

To provide a solid tire capable of improving durability of an electronic component provided in a tire.SOLUTION: A solid tire includes a pair of side surfaces 8, and an electronic component 11. At least one of the side surfaces 8 has ribs 10 which locally project to outside in a tire axial direction and extend in a tire circumferential direction. The electronic component 11 is arranged in the ribs 10.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 provided inside the tire. [Means for solving the problem]

[0006] The present invention is a solid tire including a pair of side surfaces and an electronic component, at least one of the pair of side surfaces has a rib that protrudes locally axially outward and extends circumferentially of the tire, and the electronic component is disposed inside the rib. Effect of the Invention

[0007] The solid tire of the present invention has the above-mentioned configuration, and therefore can improve the durability of electronic components provided inside the tire. [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] FIG. 2 is an enlarged perspective view of the solid tire of FIG. 1. [Figure 4] FIG. 2 is an enlarged cross-sectional view of a side surface and a rib of FIG. [Diagram 5] FIG. 2 is a cross-sectional view of a solid tire according to another embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged perspective view of the solid tire of FIG. 5. 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 multiple rubber layers 2 stacked in the tire radial direction. The multiple rubber layers 2 include a base rubber layer 3 having a contact surface 3s with the mounted rim R, a tread rubber layer 4 having a ground contact surface 4s, and a center rubber layer 5 between the base rubber layer 3 and the tread rubber layer 4. However, the tire 1 of the present invention is not limited to this embodiment, and may be composed of only 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 pair of side surfaces 8 and an electronic component 11. The side surfaces 8 extend in the tire radial direction on the tire axially outer side than the ground contact surface 4s. The side surfaces 8 refer to the outer surfaces of the tire 1 from a tread edge Te to a surface that comes into contact with 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 a long and narrow plate shape having 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 the like, the cross section is shown without hatching.

[0019] Fig. 3 shows an enlarged perspective view of a side surface 8 of the tire 1. As shown in Fig. 3, at least one of the pair of side surfaces 8, and in this embodiment, both of them, has a rib 10. The rib 10 locally protrudes from a main portion of the outer surface of the side surface 8 and extends in the tire circumferential direction. In this embodiment, the rib 10 extends continuously in the tire circumferential direction, but as described later, the rib 10 may extend discontinuously in the tire circumferential direction.

[0020] As shown in Fig. 1, the rib 10 includes an outer side surface 16 facing outward in the tire radial direction and an inner side surface 17 facing inward in the tire radial direction. In a tire cross section, an angle θ1 between a tangent line 16a passing through the outer side surface 16 and a tangent line 17a passing through the inner side surface 17 and having the smallest angle with respect to the tire axial direction is set to 100° or less. The angle θ1 is preferably 90° or less, and more preferably 45° or less. In a more preferable embodiment, the outer side surface 16 and the inner side surface 17 each extend at an angle of 10° or less with respect to the tire axial direction.

[0021] 1 and 3, in the present invention, the electronic component 11 is disposed inside the rib 10. Even if a solid tire 1 equipped with the rib 10 is used under a large load and a large distortion occurs in the tire main body, the rib 10 itself is unlikely to be distorted. Therefore, the electronic component 11 disposed inside the rib 10 is unlikely to be affected by distortion, and its durability can be improved.

[0022] 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.

[0023] As shown in Fig. 1, the tread rubber layer 4, the base rubber layer 3, and the center rubber layer 5 are preferably made of different types of rubber. In particular, the center rubber layer 5 preferably has a complex modulus E* smaller than those of the tread rubber layer 4 and the base rubber layer 3. This allows the center rubber layer 5 to absorb vibrations, resulting in excellent ride comfort. In this specification, the complex modulus E* is a value measured using a viscoelasticity spectrometer under the following conditions in accordance with the provisions of JIS-K6394. Initial distortion: 10% Amplitude: ±2% Frequency: 10Hz Deformation mode: tension Measurement temperature: 30℃

[0024] In this embodiment, a rib 10 is provided on the above-mentioned center rubber layer 5. This makes it difficult for vibration to be transmitted to the electronic component 11, and further improves the durability thereof.

[0025] Fig. 4 shows an enlarged view of the rib 10 in Fig. 1. As shown in Fig. 4, a distance L1 in the tire radial direction from the innermost end 1i (shown in Fig. 1) of the tire 1 in the tire radial direction to the rib 10 (specifically, a center position 10c in the tire radial direction of the rib 10 described later) is preferably 45% to 80% of the tire cross-sectional height ht (shown in Fig. 1). This makes it possible to effectively prevent adverse effects on the electronic component 11 even when wear of the tread rubber layer 4 progresses.

[0026] The width W1 of the rib 10 in the tire axial direction is preferably 4% to 15% of the tread width TW (shown in FIG. 1, and the same applies below), and more preferably 5% to 10%. This makes it possible to improve the durability of the electronic component 11 while ensuring a sufficient tread width TW. The width W1 of the rib 10 corresponds to the distance in the tire axial direction from the tread end Te to the surface 15 of the rib 10 on the outer side in the tire axial direction.

[0027] From the viewpoint of improving various performances of the tire 1 and the durability of the electronic components 11 in a well-balanced manner, it is preferable to specify the distance L2 in the tire axial direction from the tread end Te on the side where the rib 10 and the electronic components 11 are arranged to the electronic components 11 according to the size of the tread width TW. From this viewpoint, when the tread width TW is less than 100 mm, the distance L2 is preferably 2 mm or more, and more preferably 2 to 10 mm. Also, when the tread width TW is 100 mm or more, the distance L2 is preferably 4 mm or more, and more preferably 4 to 15 mm.

[0028] The electronic component 11 is desirably located 3 mm or more away from the outer surface of the rib 10. In other words, the electronic component 11 is desirably located 3 mm or more away from each of the outer surface 16 and inner surface 17 of the rib 10 in the tire radial direction and the outer surface 15 in the tire axial direction. This further improves the durability of the electronic component 11.

[0029] The electronic component 11 is desirably disposed so as to cross a center position 10c in the tire radial direction of the rib 10. This further improves the durability of the electronic component 11. Note that the center position 10c refers to the position of an imaginary line extending parallel to the tire axial direction, passing through the center in the tire radial direction of an area of ​​the surface 15 on the outer side in the tire axial direction of the rib 10, the area extending at an angle of 5° or less with respect to the tire radial direction.

[0030] In the tire cross section, the electronic component 11 is desirably located 3 mm or more outboard of an imaginary straight line 19 connecting the tread edge Te and the axially outer end of the contact surface 3s of the base rubber layer 3 with the mounting rim R. This makes it difficult for distortion of the tire body to act on the electronic component 11, further improving the durability of the electronic component.

[0031] 1, in a more preferable embodiment, a plurality of lateral grooves 20 extending in the tire axial direction are provided in the tire circumferential direction on the ground contact surface 4s of the tread rubber layer 4, and it is preferable that the position of one of the lateral grooves 20 coincides with the position of the electronic component 11 in the tire circumferential direction. In other words, it is preferable that the lateral grooves 20 are arranged so that a tire cross section passing through the tire rotation axis and the electronic component 11 passes through the inside of one of the lateral grooves 20. As a result, when ground contact pressure acts on the tire, the lateral grooves 20 deform, thereby making it possible to alleviate distortion around the electronic component 11, and the durability of the electronic component 11 can be further improved.

[0032] FIG. 5 is a tire cross-sectional view of another embodiment of the present invention. As shown in FIG. 5, in this embodiment, the rib 10 protrudes more locally toward the tire axial direction outward from the side surface 8 compared to the embodiment shown in FIG. 1. As a result, a curved portion with a curvature radius of 5 mm or less is formed between the main body of the side surface 8 and the outer surface 16 or the inner surface 17 of the rib 10 in the tire radial direction. In addition, the angle θ2 of the outer surface 16 or the inner surface 17 with respect to the tire axial direction is 20° or less. In addition, the angle θ3 between the main body of the side surface 8 and the outer surface 16 or the inner surface 17 is 120° or less, preferably 110 to 90°. Such a shape of the rib 10 can further suppress distortion around the electronic component 11.

[0033] In this embodiment, ribs 10 and electronic components 11 are provided on both of the pair of side surfaces 8. This makes it possible to provide a plurality of electronic components 11 with different functions. However, the present invention is not limited to this embodiment, and it is sufficient that at least one electronic component 11 is provided.

[0034] Fig. 6 is an enlarged perspective view showing the side surface 8 of this embodiment. As shown in Fig. 6, a plurality of ribs 10 may be arranged in the tire circumferential direction. That is, a plurality of ribs 10 may be arranged in the tire circumferential direction on one side surface 8 with gaps 23 therebetween, and electronic components 11 may be provided inside one or some of the ribs. This embodiment has superior heat dissipation properties of the rib 10 compared to an embodiment in which the rib 10 extends continuously in the tire circumferential direction, and is particularly suitable for use in the case of using electronic components 11 that are sensitive to heat.

[0035] In this embodiment, it is desirable that, among the multiple ribs 10 aligned in the tire circumferential direction, the appearance of the rib 10 on which the electronic component 11 is arranged is different from that of the other ribs 10. This difference in appearance may be realized in various ways, for example, by differences in width, length, shape, etc. of the ribs 10, or by the presence or absence of a mark on the outer surface of the rib 10. Such a difference in appearance allows the position of the rib 10 on which the electronic component 11 is arranged to be immediately recognized, improving the workability of tire maintenance, etc.

[0036] 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.

[0037] [Note] The present invention includes the following aspects.

[0038] [Invention 1] A solid tire, A pair of side surfaces; and an electronic component. At least one of the pair of side surfaces has a rib that locally protrudes outward in the axial direction of the tire and extends in the circumferential direction of the tire, The electronic component is disposed inside the rib. Solid tires. [Invention 2] The tire includes a plurality of rubber layers stacked in a radial direction, The plurality of rubber layers include a base rubber layer having a contact surface with a mounting rim, a tread rubber layer having a ground contact surface, and a center rubber layer between the base rubber layer and the tread rubber layer, The solid tire according to the first aspect of the present invention, wherein the rib is provided on the center rubber layer. [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 the rib is 45% to 80% of a tire cross-sectional height. [Invention 4] a tread rubber layer having a ground contact surface; The tread rubber layer has a tread width which is the length of the contact surface in the tire axial direction, 4. The solid tire according to any one of claims 1 to 3, wherein the width of the rib in the tire axial direction is 4% to 15% of the tread width. [Invention 5] a tread rubber layer having a ground contact surface; The tread rubber layer has a pair of tread ends which are ends of the ground contact surface in the tire axial direction, and a tread width which is the length of the ground contact surface in the tire axial direction, The tread width is less than 100 mm, 5. The solid tire according to any one of claims 1 to 4, wherein a distance in the tire axial direction from the tread end on the side where the rib is arranged to the electronic component is 2 mm or more. [Invention 6] a tread rubber layer having a ground contact surface; The tread rubber layer has a pair of tread ends which are ends of the ground contact surface in the tire axial direction, and a tread width which is the length of the ground contact surface in the tire axial direction, The tread width is 100 mm or more, 5. The solid tire according to any one of claims 1 to 4, wherein a distance in the tire axial direction from the tread end on the side where the rib is arranged to the electronic component is 4 mm or more. [Invention 7] 7. The solid tire according to any one of claims 1 to 6, wherein the electronic component is spaced 3 mm or more from the outer surface of the rib. [Invention 8] The solid tire according to any one of claims 1 to 7, wherein the electronic component is disposed across a center position of the rib in a radial direction of the tire. [The present invention 9] The tire includes a tread rubber layer having a ground contact surface and a base rubber layer including a contact surface with a mounting rim, The tread rubber layer has a pair of tread ends which are ends of the ground contact surface in the tire axial direction, The solid tire according to any one of claims 1 to 8, wherein, in a tire cross section, the electronic component is located axially outboard of a virtual line connecting the tread edge and the axially outer end of the contact surface of the base rubber layer by 3 mm or more. [Explanation of symbols]

[0039] 8 Side surface 10. Ribs 11 Electronic Components

Claims

1. A solid tire, A pair of side surfaces; and an electronic component. At least one of the pair of side surfaces has a rib that locally protrudes outward in the axial direction of the tire and extends in the circumferential direction of the tire, The electronic component is disposed inside the rib. Solid tires.

2. The tire includes a plurality of rubber layers stacked in a radial direction, The plurality of rubber layers include a base rubber layer having a contact surface with a mounting rim, a tread rubber layer having a ground contact surface, and a center rubber layer between the base rubber layer and the tread rubber layer, The solid tire according to claim 1 , wherein the rib is provided on the center rubber layer.

3. 3. 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 rib is 45% to 80% of a tire section height.

4. a tread rubber layer having a ground contact surface; The tread rubber layer has a tread width which is the length of the contact surface in the tire axial direction, 3. The solid tire according to claim 1, wherein the width of the rib in the tire axial direction is 4% to 15% of the tread width.

5. a tread rubber layer having a ground contact surface; The tread rubber layer has a pair of tread ends which are ends of the ground contact surface in the tire axial direction, and a tread width which is the length of the ground contact surface in the tire axial direction, The tread width is less than 100 mm, 3. The solid tire according to claim 1, wherein a distance in the tire axial direction from the tread end on the side where the rib is disposed to the electronic component is 2 mm or more.

6. a tread rubber layer having a ground contact surface; The tread rubber layer has a pair of tread ends which are ends of the ground contact surface in the tire axial direction, and a tread width which is the length of the ground contact surface in the tire axial direction, The tread width is 100 mm or more, 3. The solid tire according to claim 1, wherein a distance in the tire axial direction from the tread end on the side where the rib is disposed to the electronic component is 4 mm or more.

7. 3. The solid tire according to claim 1, wherein the electronic component is spaced 3 mm or more from the outer surface of the rib.

8. 3. The solid tire according to claim 1, wherein the electronic component is disposed across a center position of the rib in a radial direction of the tire.

9. The tire includes a tread rubber layer having a ground contact surface and a base rubber layer including a contact surface with a mounting rim, The tread rubber layer has a pair of tread ends which are ends of the contact surface in the tire axial direction, 3. The solid tire according to claim 1, wherein in a tire cross section, the electronic component is located axially outboard of a virtual line connecting the tread edge and an axially outer end of the contact surface of the base rubber layer by 3 mm or more.

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