Functional component storage body and tire

Abstract

To provide a functional component storage body capable of improving measurement performance of tire information by a functional component by controlling an adhesive to uniform thickness in fixing a storage body to a curved tire inner surface, and a tire.SOLUTION: In a functional component storage body provided with a storage body 10 for storing a functional component 20 having a sensor function for detecting tire information and to be adhered to a tire inner surface through an adhesive layer X, the storage body 10 has: a flat plate-like base part 11; a side wall part 12 projecting from a plane 11x on one side of the base part 11; at least one protrusion part 15 protruding from a plane 11y on the other side of the base part 11; and a storage part 13 formed by the base part 11 and the side wall part 12 to store the functional component 20, the plane 11y on the other side of the base part 11 is an adhesive surface, and the protrusion part 15 is arranged within a projection area in which a bottom surface 13x of the storage part 13 is projected to the plane 11y on the other side of the base part 11.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a functional component container and a tire, and more particularly to a functional component container and a tire that enable improved tire information measurement performance using functional components by controlling the adhesive to a uniform thickness when fixing the container to the curved inner surface of a tire. [Background technology]

[0002] In order to acquire tire information, functional components (e.g., a sensor unit including a sensor) are installed on the inner surface of a tire (see, for example, Patent Documents 1 and 2). When attaching a container that houses such functional components to the inner surface of the tire, the container can be fixed to the inner surface of the tire using an adhesive or the like to prevent the container from falling off. However, when fixing the container to the curved inner surface of the tire, it is difficult to control the adhesive to a uniform thickness, which poses a problem that the base of the container may be fixed in a distorted state. As a result, when sensing information such as vibrations during tire rotation and impacts upon contact with the ground, it is difficult to achieve stable sensing due to the effects of variations in the thickness and inclination of the adhesive and the distortion of the base. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6272225 [Patent Document 2] Special Publication No. 2016-505438 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a functional component container and a tire that enable improved tire information measurement performance using functional components by controlling the adhesive to a uniform thickness when fixing the container to the curved inner surface of the tire. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, the functional component container of the present invention comprises a container in which a functional component having a sensor function for detecting tire information is housed, and is adhered to the inner surface of the tire via an adhesive layer, the container having a flat base, a side wall portion protruding from one side surface of the base, at least one protrusion portion protruding from the other side surface of the base, and a container portion formed by the base and the side wall portion for housing the functional component, the other side surface of the base being the adhered surface, and the protrusion portion being positioned within a projection area obtained by projecting the bottom surface of the container portion onto the other side surface of the base.

[0006] The tire of the present invention is characterized in that the functional component container is fixed to the back surface of the tread portion. [Effects of the Invention]

[0007] In the present invention, the housing includes a flat base, a sidewall protruding from one surface of the base, at least one protrusion protruding from the other surface of the base, and a housing formed by the base and the sidewall for housing a functional component. The other surface of the base is the bonded surface, and the protrusion is located within a projected area of ​​the bottom of the housing onto the other surface of the base. The presence of the protrusion creates a gap between the tire inner surface and the other surface (back surface) of the base, and an adhesive layer is present in this gap. Such protrusions allow the thickness of the adhesive layer to be uniform in the lower region of the housing, even on a curved tire inner surface, and also reinforce the base. This suppresses distortion of the base and maintains the lower region of the housing flat, thereby improving tire information measurement performance using the functional component.

[0008] In the functional component container of the present invention, the area S of the projection area of ​​the bottom surface of the container section A [mm 2 ] the area of ​​the protrusion S B [mm2 The ratio of [0.05% to 0.1%] is preferably in the range of 5% to 100%. This makes it possible to sufficiently ensure adhesion to the tire inner surface while also obtaining the sufficient effect of improving the measurement performance of the functional component due to the protrusions.

[0009] The maximum height h of the protrusions is preferably in the range of 0.2 mm to 3.0 mm, which allows the protrusions to sufficiently improve the measurement performance of the functional parts while ensuring sufficient adhesion to the tire inner surface.

[0010] The other surface of the base has a plurality of protrusions, and the difference dH between the maximum height h1 and the minimum height h2 of the protrusions is preferably 0.3 mm or less, which allows the thickness of the adhesive layer to be effectively controlled and provides a sufficient effect of suppressing distortion of the base.

[0011] The protrusions are made of vulcanized rubber, and the modulus M 100 It is preferable that the pressure is 0.5 MPa or more and less than 12.0 MPa, which can effectively improve the tire information measurement performance of the functional parts.

[0012] The functional part has a sensor element that detects tire information, and at least one protrusion is included in a projection area Rp of the sensor element projected onto the other side surface of the base when the functional part is housed in the housing part, and the projection area Sp [mm 2 ], the area Sc [mm 2 It is preferable that the ratio of [A] is in the range of 10% to 150%. This ensures sufficient output from the element section, effectively improving the tire information measurement performance of the functional parts.

[0013] The center of the protrusion preferably coincides with the center of the projection area of ​​the bottom surface of the housing portion projected onto the other surface of the base, thereby enabling effective control of the thickness of the adhesive layer and achieving a sufficient effect of suppressing distortion of the base.

[0014] The container preferably has an auxiliary protrusion protruding from the other surface of the base and positioned outside the projection area, which allows the thickness of the adhesive layer to be controlled while suppressing distortion of the base, thereby improving the tire information measurement performance of the functional component.

[0015] The container is preferably made of vulcanized rubber, and the excellent effects described above can be obtained even when such a container is used.

[0016] The functional component is housed in the housing, and preferably has a sensor function using a piezoelectric element as a sensor element. When a functional component having a sensor function using such a piezoelectric element is used, a significant effect can be obtained.

[0017] In the tire of the present invention, the thickness Dg of the adhesive layer between the protrusions and the tire inner surface is preferably in the range of 0 mm to 1 mm. When the protrusions are attached to the tire inner surface by the adhesive layer, the thickness of the adhesive layer can be effectively controlled by the protrusions, and the effect of suppressing distortion of the base can be sufficiently obtained, thereby effectively improving the tire information measurement performance of the functional component.

[0018] The tire of the present invention is preferably a pneumatic tire, but may also be a non-pneumatic tire. In the case of a pneumatic tire, the interior thereof can be filled with air, an inert gas such as nitrogen, or other gases.

[0019] In the present invention, the modulus M at 100% elongation 100 is the tensile stress at 100% elongation measured in accordance with JIS K6251. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view showing an example of a functional component container according to an embodiment of the present invention; [Figure 2]2 is a perspective view showing the mounting surface (rear surface) of the functional component container of FIG. 1. FIG. [Figure 3] FIG. 2 is a plan view showing the functional component container of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3. [Figure 5] 2 is an explanatory diagram of each region in the functional component container of FIG. 1. FIG. [Figure 6] FIG. 10 is a cross-sectional view showing a modified example of the functional component container according to the embodiment of the present invention. [Figure 7] 10(A) to 10(C) are plan views showing other modified examples of the protrusions of the functional component container according to the embodiment of the present invention. [Figure 8] 10(A) to 10(K) are plan views showing other modified examples of the protrusions of the functional component container according to the embodiment of the present invention. [Figure 9] 1 is a meridian cross-sectional view showing an example of a pneumatic tire according to an embodiment of the present invention. [Figure 10] FIG. 4 is a diagram showing an example of an output waveform from a piezoelectric element. DETAILED DESCRIPTION OF THE INVENTION

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail below with reference to the accompanying drawings, in which: Figures 1 to 5 show a functional component container according to an embodiment of the present invention.

[0022] As shown in FIGS. 1 to 5, the functional component 20 is accommodated inside a housing 10. The housing 10 has a flat base 11 fixed to the inner surface of the tire, a cylindrical side wall 12 protruding from one surface 11x (surface) of the base 11, a housing section 13 formed by the base 11 and the side wall 12, and an opening 14 communicating with the housing section 13 and for inserting and removing the functional component 20. The housing 10 may be a molded body made of one type of vulcanized rubber, or may be a molded body made of multiple types of vulcanized rubber. The housing section 13 is the internal region of the housing 10 excluding the thickness of the opening 14.

[0023] The other surface 11y (back surface) of the base 11 is adhered to the tire inner surface via an adhesive layer X. An adhesive or double-sided adhesive tape can be used as the adhesive layer X. At least one protrusion 15 is provided on the back surface of the base 11, protruding from the back surface. The protrusion 15 has a top surface 15x that is a plane that is approximately parallel to the bottom surface 13x of the storage section 13. The angle formed between the top surface 15x of the protrusion 15 and the bottom surface 13x of the storage section 13 can be set in the range of -5° to +5°, but is preferably 0°. Note that another protrusion having an arbitrary shape protruding from one surface 11x (front surface) of the base 11 may be provided inside the storage section 13.

[0024] 5, such protrusion 15 is disposed within a projection area Ra formed by projecting bottom surface 13x of storage section 13 onto the rear surface of base 11. In FIG. 5, the center position of protrusion 15 coincides with the center position of projection area Ra of storage section 13. Furthermore, a protrusion other than protrusion 15 may be provided on the rear surface of base 11. When multiple protrusions are formed on the rear surface of base 11, it is sufficient that at least one of the multiple protrusions is disposed within projection area Ra of bottom surface 13x of storage section 13.

[0025] The functional component 20 has a contact surface 21 that contacts the inner surface of the tire. That is, the contact surface 21 is the surface that contacts the bottom surface 13x of the housing 13. The functional component 20 also has a structure in which various electronic components are housed inside a housing 23. The electronic components can be configured to include various sensors, transmitters, receivers, control circuits, batteries, and the like for acquiring tire information. Tire information acquired by the sensors can include the internal temperature and pressure of the pneumatic tire, the amount of tread wear, and the like. For example, a temperature sensor or pressure sensor is used to measure the internal temperature and pressure. To detect the amount of tread wear of a tire, for example, a sensor element 22 made of a film-like piezoelectric element is disposed on the contact surface 21 of the functional component 20. The sensor element 22 detects an output voltage corresponding to tire deformation during driving, and the amount of tread wear is detected based on the output voltage. Alternatively, an acceleration sensor or magnetic sensor can be used. The sensor element 22 can be disposed on either the outer or inner surface of the housing 23.

[0026] In the functional component container described above, the back surface of the base 11 is the adhered surface, and the protrusions 15 are disposed within a projected area Ra obtained by projecting the bottom surface 13x of the container 13 onto the back surface of the base 11. The presence of the protrusions 15 creates a gap between the tire inner surface and the back surface of the base 11, with the adhesive layer X being present in this gap. Such protrusions 15 make it possible to uniformly control the thickness of the adhesive layer X in the lower region of the container 13 even on a curved tire inner surface, and also to reinforce the base 11. This suppresses distortion of the base 11 and keeps the lower region of the container 13 flat, thereby improving the tire information measurement performance of the functional component 20.

[0027] In the present invention, examples of the tire information measurement performance of the functional component 20 include sensing accuracy and sensing sensitivity. Sensing accuracy refers to the ability to accurately detect changes in physical quantities caused by deformation of the tread portion. By improving this sensing accuracy, the coefficient of variation CV of the peak-to-peak value of the output waveform becomes smaller, making it possible to accurately grasp changes in physical quantities caused by tire deformation. On the other hand, sensing sensitivity refers to the ability to sensitively detect changes in physical quantities caused by impacts from the road surface. By improving this sensing sensitivity, the peak-to-peak value of the output waveform becomes larger, making it possible to accurately grasp the timing at which physical quantities change due to impacts from the road surface.

[0028] In the functional component container, the projected area S of the projected region Ra of the bottom surface 13x of the container portion 13 is A [mm 2 ] the area S of the protrusion 15 B [mm 2 ] ratio S B / S A ×100% is preferably in the range of 5% to 100%, more preferably in the range of 5% to 50%, and even more preferably in the range of 10 to 30%. Furthermore, it can be set in the range of 10% to 20%. The area S of the protrusion B means the area of ​​the protrusion included in the projection area Ra of the bottom surface 13x of the housing portion 13, and means the total area of ​​the protrusions when multiple protrusions are provided within the projection area Ra. B / S A By appropriately setting the thickness of the protrusion 15, it is possible to obtain a sufficient effect of improving the measurement performance of the functional component 20 by the protrusion 15 while ensuring sufficient adhesion to the tire inner surface.

[0029] Here, the ratio S B / S A If the ratio S is less than 5%, the effect of improving the measurement performance (especially the sensing accuracy) of the functional component 20 by the protrusion 15 cannot be sufficiently obtained. B / S AIf it exceeds 100%, the protrusions 15 will be excessively large and the area of ​​the adhesive layer X will be reduced, which will tend to reduce the adhesive strength of the adhesive layer X and reduce its durability.

[0030] Furthermore, the maximum height h of the protrusions 15 (see FIG. 4) is preferably in the range of 0.2 mm to 3.0 mm, and more preferably in the range of 0.5 mm to 1.5 mm. In this case, it is desirable that the thickness of the adhesive layer X is uniform, but the thickness of the adhesive layer X may gradually decrease toward the outer edge of the base 11. By appropriately setting the maximum height h of the protrusions 15 in this manner, it is possible to sufficiently ensure adhesion to the tire inner surface while sufficiently obtaining the effect of improving the measurement performance of the functional component 20 by the protrusions 15. The maximum height h of the protrusions 15 is measured from the back surface of the base 11 to the top surface 15x of the protrusions 15.

[0031] If the maximum height h of the protrusion 15 is less than 0.2 mm, the adhesive strength of the adhesive layer X will be insufficient, resulting in reduced durability. Conversely, if the maximum height h of the protrusion 15 is more than 3.0 mm, the rubber constituting the housing 10 and the thickness of the adhesive layer X will interfere with the signal output by the functional part 20, resulting in reduced tire information measurement performance by the functional part 20.

[0032] The protrusions 15 can be made of vulcanized rubber. Furthermore, the modulus M of the protrusions 15 at 100% elongation is 100 is preferably 0.5 MPa or more and less than 12.0 MPa, and more preferably in the range of 0.8 MPa to 2.0 MPa. When the protrusions 15 have such physical properties, the tire information measurement performance of the functional part 20 can be effectively improved. Furthermore, the protrusions 15 may be made of the same rubber as that of the container 10, or may be made of a different rubber. For example, the protrusions 15 can be molded integrally with the container 10 using a mold for the container 10 using a rubber with a different hardness from that of the container 10. Alternatively, the protrusions 15 may be molded separately from the container 10 and then bonded to the back surface of the base 11.

[0033] In addition, in the functional component container, the area Sc [mm 2 ] is the projected area Sp [mm ] of the projected region Rp formed by projecting the sensor element 22 onto the rear surface of the base 11 in a state where the functional component 20 is housed in the housing portion 13. 2 ] is preferably 10% to 150%, and more preferably 70% to 110%. By appropriately setting the area ratio Sc / Sp×100% in this way, it is possible to ensure a sufficient output from the sensor element 22, and therefore it is possible to effectively improve the tire information measurement performance of the functional part 20.

[0034] 1 to 5, the protrusion 15 is located at the center of the base 11, and the sensor element 22 constituting the functional component 20 is also located at the center of the base 11. The diameter of the sensor element 22 is configured to be larger than the diameter of the protrusion 15. In this case, the projection area Rp of the sensor element 22 encompasses the protrusion 15 as shown in FIG. 5. This indicates a case where the area ratio Sc / Sp is smaller than 100%.

[0035] FIG. 6 shows a modified example of a functional component container according to an embodiment of the present invention. As shown in FIG. 6, a plurality of protrusions 15, 16 are formed on the back surface of the base 11. That is, the base 11 has protrusions 15 (first protrusions) and protrusions 16 (second protrusions). The protrusions 15 and 16 have different heights, with the height of the protrusion 15 having a maximum value h1 and the height of the protrusion 16 having a minimum value h2. In this case, the difference dH between the height of the protrusion 15 (maximum value h1) and the height of the protrusion 16 (minimum value h2) is preferably 0.3 mm or less, and more preferably 0.1 mm or less. In particular, it is desirable that the protrusion 15 having the maximum value h1 be positioned close to the center of the container 10 (base 11).

[0036] By appropriately setting the difference dH in this way, it is possible to effectively control the thickness of the adhesive layer X and to sufficiently suppress distortion of the base 11. Here, if the difference dH exceeds 0.3 mm, it becomes difficult to effectively control the thickness of the adhesive layer X, and the suppression effect against distortion of the base 11 also tends to decrease.

[0037] 7A to 7C show other modified examples of the protrusions of the functional component container according to the embodiment of the present invention. As shown in FIG. 7A, one protrusion 15 (first protrusion) and a pair of protrusions 16a and 16b (second protrusions) are formed on the back surface of the base 11. The protrusion 15 has a circular planar shape, and the protrusions 16a and 16b have rectangular planar shapes. The protrusion 15 is disposed at the center of the base 11, and the pair of protrusions 16a and 16b are disposed at equal distances from the center of the base 11, sandwiching the protrusion 15 therebetween. That is, the protrusions 16a and 16b are disposed line-symmetrically with respect to the center line L of the projection area Ra, and are disposed point-symmetrically with respect to the center point C of the projection area Ra.

[0038] In FIG. 7(B), one protrusion 15 and a pair of protrusions 16a and 16b are formed on the back surface of the base 11. The protrusion 15 has a circular planar shape, and the protrusions 16a and 16b have an L-shaped planar shape. The protrusion 15 is disposed at the center of the base 11, and the pair of protrusions 16a and 16b are disposed at equal distances from the center of the base 11, sandwiching the protrusion 15 therebetween. That is, the protrusions 16a and 16b are disposed symmetrically with respect to the center line L of the projection area Ra. Also, in FIG. 7(C), one protrusion 15 and a pair of protrusions 16a and 16b are formed on the back surface of the base 11. The protrusion 15 has a circular planar shape, and the protrusions 16a and 16b have arc-shaped planar shapes. The protrusion 15 is disposed at the center of the base 11, and the pair of protrusions 16a and 16b are disposed at equal distances from the center of the base 11, sandwiching the protrusion 15 therebetween. That is, the protrusions 16a and 16b are arranged point-symmetrically with respect to the center point C of the projection area Ra.

[0039] 7(A) to 7(C), the center of the protrusion 15 coincides with the center of the projection area Ra on the bottom surface 13x of the housing portion 13. As long as the center of the protrusion 15 coincides with the center of the projection area Ra, the other protrusions 16a and 16b may be positioned off-center from the center of the projection area Ra. By positioning the protrusions 15 in this manner, the thickness of the adhesive layer X can be effectively controlled, and the effect of suppressing distortion of the base 11 can be sufficiently obtained. In particular, as shown in FIGS. 7(A) to 7(C), it is desirable that the protrusions 16a and 16b be positioned line-symmetrically with respect to the center line L of the projection area Ra and / or be positioned point-symmetrically with respect to the center point C of the projection area Ra.

[0040] 8(A) to 8(K) show other modified examples of the protrusions of the functional component container according to the embodiment of the present invention. Examples include a circular protrusion 15 surrounded by annular protrusions 16 as shown in Fig. 8(A) and (F), a circular protrusion 15 alone as shown in Fig. 8(B), a single circular protrusion 15 surrounded by four equally spaced circular protrusions 16 as shown in Fig. 8(C), and a single circular protrusion 15 surrounded by four equally spaced arc-shaped protrusions 16 as shown in Fig. 8(D). 8(E), a configuration in which only rectangular protrusions 15 are arranged, a configuration in which one annular protrusion 15 is sandwiched between two circular protrusions 16 as shown in FIG. 8(G), a configuration in which cross-shaped protrusions 15 extending from the center to the outer edge of base 11 as shown in FIG. 8(H), and a configuration in which the center of base 11 is a circular portion and protrusions 15 extending radially from the circular portion to the outer edge of base 11 as shown in FIG. 8(I). Also, a configuration in which one circular protrusion 15 and annular protrusions 16 are arranged on the outer edge of base 11 as shown in FIG. 8(J), and a configuration in which one circular protrusion 15 and four arc-shaped protrusions 16 are arranged on the outer edge of base 11 as shown in FIG. 8(K) can be exemplified. In Figures 8(A) to (E), both protrusion 15 and protrusion 16 are positioned within the projection area Ra of the bottom surface 13x of the storage section 13, and in Figures 8(F) to (K), a portion of protrusion 15 or protrusion 16 is positioned outside the projection area Ra of the bottom surface 13x of the storage section 13.

[0041] In the present invention, the container 10 preferably has, in addition to the protrusions 15 arranged within the projection area Ra, auxiliary protrusions protruding from the rear surface of the base 11 and arranged outside the projection area Ra. Here, in FIGS. 8(F), (G), (J), and (K), the protrusions 15 (first protrusions) are arranged within the projection area Ra, and the protrusions 16 (second protrusions) are arranged outside the projection area Ra, so the protrusions 16 correspond to the "auxiliary protrusions." On the other hand, in FIGS. 8(H) and (I), only a portion of the protrusions 15 is arranged outside the projection area Ra, so the portion arranged outside the projection area Ra corresponds to the "auxiliary protrusions." Having both the protrusions 15 and the auxiliary protrusions in the container 10 in this way allows the thickness of the adhesive layer X to be controlled while suppressing distortion of the base 11, thereby improving the tire information measurement performance (sensing accuracy) of the functional component 20.

[0042] Fig. 9 shows a pneumatic tire according to an embodiment of the present invention. As shown in Fig. 9, the pneumatic tire includes an annular tread portion 1 extending in the circumferential direction of the tire, a pair of sidewall portions 2 disposed on both sides of the tread portion 1, and a pair of bead portions 3 disposed radially inward of the sidewall portions 2.

[0043] A carcass layer 4 is mounted between the pair of bead portions 3. This carcass layer 4 includes a plurality of reinforcing cords extending in the tire radial direction, and is folded back from the inside to the outside of the tire around a bead core 5 disposed in each bead portion 3. A bead filler 6 made of a rubber composition and having a triangular cross section is disposed on the outer periphery of the bead core 5.

[0044] On the other hand, multiple belt layers 7 are embedded on the outer peripheral side of the carcass layer 4 in the tread portion 1. These belt layers 7 include multiple reinforcing cords that are inclined with respect to the tire circumferential direction, and are arranged so that the reinforcing cords cross each other between the layers. In the belt layers 7, the inclination angle of the reinforcing cords with respect to the tire circumferential direction is set to a range of 10° to 40°, for example. Steel cords are preferably used as the reinforcing cords of the belt layers 7. At least one belt cover layer 8 is arranged on the outer peripheral side of the belt layer 7, with the aim of improving high-speed durability, and the reinforcing cords are arranged at an angle of, for example, 5° or less with respect to the tire circumferential direction. As the reinforcing cords of the belt cover layer 8, organic fiber cords such as nylon and aramid are preferably used.

[0045] The above-described tire internal structure is a typical example of a pneumatic tire, but is not limited to this.

[0046] In the above-described pneumatic tire, a container 10 is provided on the back surface of the tread portion 1, and contains a functional component 20 therein, the functional component having a sensor function for detecting tire information. Such a functional component container is fixed to the back surface of the tread portion 1 of the tire by an adhesive layer X. The presence or absence of the functional component 20 in the functional component container is optional, and the functional component container may be fixed to the back surface of the tread portion 1 in a state where the functional component 20 is not contained in the container portion 13.

[0047] In this case, the thickness Dg of the adhesive layer X between the protrusions 15 and the tire inner surface is preferably in the range of 0 mm to 1 mm, and more preferably in the range of 0 mm to 0.5 mm. By appropriately setting the thickness Dg of the adhesive layer X in this manner, the thickness Dg of the adhesive layer X can be effectively controlled by the protrusions 15, and the distortion of the base 11 can be sufficiently suppressed, thereby effectively improving the tire information measurement performance of the functional component 20.

[0048] Here, if the thickness Dg of the adhesive layer X exceeds 1 mm, the effect of suppressing distortion of the base 11 that should be obtained by the protrusion 15 will be reduced, so the effect of improving the tire information measurement performance of the functional part 20 will be reduced and durability will also tend to be reduced. [Example]

[0049] The tire size is 185 / 65R15, and the container has a base, a side wall, and a container, and the back surface of the base is fixed to the inner surface of the tire via an adhesive layer. A , the area of ​​the protrusion S B , area ratio S B / S A , height of the protrusion h, difference in height of the protrusion dH, modulus of the protrusion M 100 Tires of Comparative Example and Examples 1 to 7 were manufactured with the area ratio Sc / Sp and the presence or absence of auxiliary protrusions set as shown in Table 1. The functional part had a sensor function using a piezoelectric element as the sensor element, and the functional part was fixed to the back surface of the tread portion with an adhesive layer via a container.

[0050] In Examples 1 to 6, a single cylindrical protrusion is formed on the back surface of the base, and in Examples 4 and 5, a cylindrical first protrusion (maximum value h1) and an annular second protrusion (minimum value h2) are formed on the back surface of the base, with both the first protrusion and the second protrusion being located within the projection area. In Example 7, a cylindrical first protrusion and an annular second protrusion are formed on the back surface of the base, with the first protrusion being located within the projection area, while the second protrusion (auxiliary protrusion) is located outside the projection area. Furthermore, the first protrusion and the second protrusion in Example 7 have the same height and area. In Table 1, the "area S of protrusion" in Example 7 is B " means the area of ​​only the first protrusion, and does not include the area of ​​the second protrusion (auxiliary protrusion). In all of Examples 1 to 7, the center of the cylindrical protrusion coincides with the center of the projected area when the bottom surface of the storage section is projected onto the back surface of the base.

[0051] These test tires were evaluated for sensing accuracy, sensing sensitivity, and durability of functional parts using the following test methods, and the results are shown in Table 1.

[0052] Sensing accuracy: Each test tire was mounted on a 15x5.5 rim wheel and mounted on a drum testing machine. A running test was conducted under conditions of 230 kPa air pressure, 60% of the maximum load capacity, and a speed of 30 km / h. The output detected by the sensor element (piezoelectric element) was recorded. Figure 10 shows an example of the output waveform from the piezoelectric element. In this output waveform, when the functional component-mounted portion of the tread contacts the ground, negative and positive peaks are sequentially formed in the output of the piezoelectric element over time T, resulting in a peak-to-peak value V. The average value Vave and standard deviation σ of the peak-to-peak value V of the output waveform obtained from each of the 10 measurements were then calculated, and the coefficient of variation CV (CV = σ / Vave) was calculated. The evaluation results were expressed as an index using the reciprocal of the coefficient of variation CV, with the comparative example being set at 100. A higher index value indicates better sensing accuracy. Sensing accuracy was evaluated in this manner.

[0053] Sensing Sensitivity: Each test tire was mounted on a 15x5.5 rim wheel and mounted on a drum testing machine. A running test was conducted under conditions of 230 kPa air pressure, 60% of the maximum load capacity, and a speed of 30 km / h. The output detected by the sensor element (piezoelectric element) was recorded. Figure 10 shows an example of the output waveform from the piezoelectric element. In this output waveform, when the functional component-mounted portion of the tread contacts the ground, negative and positive peaks are sequentially formed in the output of the piezoelectric element over time T, resulting in a peak-to-peak value V. The average value of the peak-to-peak values ​​V of the output waveform obtained over each of the 10 measurements was then calculated. The evaluation results were expressed as an index, with the comparative example being 100, using the average peak-to-peak value V of the output waveform. A higher index value indicates better sensing sensitivity. Sensing sensitivity was evaluated in this manner.

[0054] Functional parts durability: Each test tire was mounted on a 15x5.5 rim wheel and attached to a drum testing machine. A running test was conducted with an air pressure of 360 kPa and a load of 88% of the maximum load capacity. Specifically, the speed was increased by 10 km / h every 10 minutes, and the maximum speed at which sensing by the functional parts was possible was measured. The evaluation results were expressed as an index, with the comparative example being set at 100. The higher the index value, the better the durability of the functional parts.

[0055] [Table 1]

[0056] As can be seen from Table 1, the tires of Examples 1 to 7 had improved sensing accuracy and durability of functional parts compared to the Comparative Example. The tires of Examples 2 to 7 had improved sensing accuracy, sensing sensitivity, and durability of functional parts compared to the Comparative Example.

[0057] The present disclosure includes the following inventions [1] to

[12] . Invention [1] is a functional component container that includes a container for housing a functional component having a sensor function for detecting tire information, and is adhered to the inner surface of a tire via an adhesive layer. The container has a flat base, a side wall protruding from one surface of the base, at least one protrusion protruding from the other surface of the base, and a container section formed by the base and the side wall for housing the functional component, the other surface of the base being the adhered surface, and the protrusion being located within a projection area obtained by projecting the bottom surface of the container section onto the other surface of the base. The invention [2] is a projection area S of the bottom surface of the storage section. A [mm 2 ] the area S of the protrusion B [mm 2 The functional component container according to the invention [1] is characterized in that the ratio of [amount of material] is in the range of 5% to 100%. Invention [3] is the functional component container according to invention [1] or [2], characterized in that the maximum height h of the protrusion is in the range of 0.2 mm to 3.0 mm. Invention [4] is a functional component container according to any one of inventions [1] to [3], characterized in that it has a plurality of the protrusions on the other side surface of the base, and the difference dH between the maximum value h1 and the minimum value h2 of the height of the protrusions is 0.3 mm or less. The invention [5] is characterized in that the protrusions are made of vulcanized rubber, and the modulus M 100 The functional component container according to any one of inventions [1] to [4] is characterized in that the pressure is 0.5 MPa or more and less than 12.0 MPa. The invention [6] is a method for manufacturing a tire-mounted ... 2 ], the area Sc [mm 2 The functional component container according to any one of inventions [1] to [5], characterized in that the ratio of [amount of material] is in the range of 10% to 150%. Invention [7] is a functional component container according to any one of inventions [1] to [6], characterized in that the center of the protrusion coincides with the center of a projection area obtained by projecting the bottom surface of the container onto the other side surface of the base. Invention [8] is a functional component container according to any one of inventions [1] to [7], characterized in that the container has an auxiliary protrusion portion that protrudes from the other side surface of the base and is positioned outside the projection area. An invention [9] is the functional component container according to any one of inventions [1] to [8], characterized in that the container is made of vulcanized rubber. Invention

[10] is a functional component container according to any one of inventions [1] to [9], characterized in that the functional component is contained in the container, and the functional component has a sensor function using a piezoelectric element as a sensor element. An invention

[11] is a tire characterized in that the functional component container according to any one of inventions [1] to

[10] is fixed to the back surface of the tread portion. Invention

[12] is the tire according to invention

[11] , characterized in that the thickness Dg of the adhesive layer between the protrusion and the tire inner surface is in the range of 0 mm to 1 mm. [Explanation of symbols]

[0058] 1 Tread section 2 Sidewall 3 Bead section 10 Containment Unit 11 Base 11x one side 11y Other side 12 Side wall 13 Storage section 13x bottom 14 Openings 15 Protrusion 20 Functional parts 21 Contact surface 22 Sensor element Ra,Rp projection area X adhesive layer

Claims

1. A functional component container includes a container for accommodating a functional component having a sensor function for detecting tire information, the functional component container being adhered to an inner surface of a tire via an adhesive layer, The container has a flat base, a side wall protruding from one side of the base, at least one protrusion protruding from the other side of the base, and a container formed by the base and the side wall for accommodating the functional component, wherein the other side of the base is the surface to be adhered, and the protrusion is positioned within a projection area obtained by projecting the bottom surface of the container onto the other side of the base.

2. The area S of the projection area of ​​the bottom surface of the storage section A [mm 2 ] with respect to the area S B [mm 2 2. The functional component container according to claim 1, wherein the ratio of [amount of adhesive] is in the range of 5% to 100%.

3. 2. The functional component container according to claim 1, wherein the maximum height h of the protrusion is in the range of 0.2 mm to 3.0 mm.

4. The functional component container according to claim 1, characterized in that it has a plurality of protrusions on the other side surface of the base, and the difference dH between the maximum height h1 and the minimum height h2 of the protrusions is 0.3 mm or less.

5. The protrusions are made of vulcanized rubber, and the modulus M 100 2. The functional component container according to claim 1, wherein the pressure is 0.5 MPa or more and less than 12.0 MPa.

6. The functional part has a sensor element that detects tire information, and at least one of the protrusions is included in a projection area Rp of the sensor element projected onto the other side surface of the base when the functional part is housed in the housing part, and a projection area Sp [mm 2 ], the area Sc [mm 2 2. The functional component container according to claim 1, wherein the ratio of [amount of the functional component container] is in the range of 10% to 150%.

7. 2. The functional component container according to claim 1, wherein the center of the protrusion coincides with the center of a projection area obtained by projecting the bottom surface of the container onto the other side surface of the base.

8. The functional component container according to claim 1 , wherein the container has an auxiliary protrusion that protrudes from the other surface of the base and is positioned outside the projection area.

9. 2. The functional component container according to claim 1, wherein the container is made of vulcanized rubber.

10. 2. The functional part container according to claim 1, wherein the functional part is housed in the housing portion, and the functional part has a sensor function using a piezoelectric element as a sensor element.

11. A tire, characterized in that the functional component container according to any one of claims 1 to 10 is fixed to the back surface of a tread portion.

12. The tire according to claim 11, wherein the thickness Dg of the adhesive layer between the projection and the tire inner surface is in the range of 0 mm to 1 mm.

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