Functional component housing and tires
The functional component housing with protrusions on its outer edge addresses deformation and adhesive issues, ensuring accurate tire information measurement and improved adhesion, thereby enhancing sensing accuracy and workability.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- THE YOKOHAMA RUBBER CO LTD
- Filing Date
- 2024-11-11
- Publication Date
- 2026-05-21
AI Technical Summary
Existing functional component containers for tires deform during pressurization, leading to inconsistent adhesive application and reduced sensing accuracy due to adhesive leakage and deformation of the container bottom, which affects the stability and efficiency of tire information measurement.
A functional component housing with a flat base and protrusions on its outer edge, designed to suppress deformation and control adhesive thickness, ensuring accurate sensing and improved adhesion by positioning projections outside the projected housing area.
The housing maintains accurate sensing by reducing deformation and adhesive leakage, enhancing adhesive workability and appearance, while maintaining consistent adhesive thickness and improving the durability of the housing.
Smart Images
Figure 2026084336000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a functional component container and a tire. More specifically, by providing a protrusion on the outer edge of the back surface of the container, it is possible to improve the measurement performance of tire information by the functional component and also improve the adhesion workability. The present invention relates to a functional component container and a tire that enable this.
Background Art
[0002] In order to acquire tire information, functional components (for example, a sensor unit including a sensor) are installed on the inner surface of the tire (for example, see Patent Documents 1 and 2). When attaching a container that houses such functional components to the inner surface of the tire, an adhesive is applied to the back surface of the container, and the container is fixed by applying pressure. However, the bottom surface of the container may deform (warp) during pressurization. In such a case, the amount of adhesive applied on the back surface of the container varies, and the deformation of the bottom surface of the container is promoted by the curing shrinkage force of the adhesive. Then, it becomes difficult to realize stable sensing. Further, when attaching the container, if the adhesive flows out from the lower region of the container, it is necessary to additionally perform a finishing process on that portion, resulting in a problem of reduced work efficiency.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Patent Document 2
Summary of the Invention
Problems to be Solved by the Invention
[0004] An object of the present invention is to provide a functional component container and a tire that can improve the measurement performance of tire information by functional components and also improve the adhesion workability by providing protrusions on the outer edge of the back surface of the container. [Means for solving the problem]
[0005] To achieve the above objective, the present invention provides a functional component housing that houses a functional component having a sensor function for detecting tire information, and is bonded to the inner surface of a tire via an adhesive layer. The housing comprises a flat base, a side wall protruding from a position inward from the outer edge on one side surface of the base, at least one projection protruding from the other side surface of the base, and a housing portion formed by the base and the side wall for housing the functional component, wherein the other side surface of the base is the surface to be bonded, and at least one of the projections is positioned outside the projection area obtained by projecting the bottom surface of the housing portion onto the other side surface of the base.
[0006] Furthermore, the tire of the present invention is characterized in that the above-mentioned functional component housing is fixed to the back surface of the tread portion. [Effects of the Invention]
[0007] In this invention, the housing comprises a flat base, a side wall protruding from a position inward from the outer edge on one side surface of the base, at least one projection protruding from the other side surface of the base, and a housing portion formed by the base and the side wall for housing functional components. The other side surface of the base is the surface to be bonded, and at least one of the projections is positioned outside the projected area obtained by projecting the bottom surface of the housing portion onto the other side surface of the base. Because the projection is located on the other side surface (back surface) of the base, even when pressure is applied when attaching the housing, the projection suppresses distortion of the base, allowing the housing to be fixed in an appropriate state, thereby improving the sensing accuracy of the functional components. Sensing accuracy refers to the ability to accurately detect changes in physical quantities caused by the deformation of the tread portion. This improvement in sensing accuracy reduces the coefficient of variation CV of the peak-to-peak value of the output waveform, making it possible to accurately grasp changes in physical quantities caused by tire deformation. Furthermore, the presence of the protrusions allows for control of the thickness of the adhesive layer in the lower area of the housing and suppresses the leakage of adhesive from the lower area of the base, thereby improving the workability of the adhesive and resulting in a better appearance.
[0008] In the functional component housing of the present invention, the ratio L2 / L1 of the circumference L1 [mm] of the base to the circumference L2 [mm] of the projection at the outer edge of the base when the projection is projected from the center of the projection area toward the outer edge of the base is preferably in the range of 0.3 to 1.0. This makes it possible to control the thickness of the adhesive layer while suppressing distortion of the base.
[0009] The protrusions preferably have symmetry with respect to the center of the projection region or a line passing through the center of the projection region. This allows for control of the adhesive layer thickness while suppressing distortion of the base in the lower region of the functional component, thereby improving the sensing accuracy of the functional component and the durability of the housing.
[0010] Preferably, at least one of the protrusions is provided within the outer edge region of the base so as to follow the outer edge of the base. This prevents the adhesive from flowing out from the lower part of the base, further improving the appearance. In addition, by appropriately setting the position and height of the protrusions, the protrusions can be used as a guide for the application position when applying adhesive to the back surface of the base, and the amount of adhesive applied can be checked, thereby effectively improving the adhesive application workability.
[0011] Preferably, the projection includes at least one outer projection provided along the outer edge of the base and at least one inner projection provided inside the outer projection. For example, by applying adhesive to the inside of the inner projection during bonding, distortion of the base in the lower area of the functional component can be effectively suppressed. Furthermore, by appropriately setting the position and height of the outer and inner projections, the inner projection can be used as a guide for the application position when applying adhesive to the back surface of the base, and the amount of adhesive applied can be checked, thereby effectively improving the bonding workability.
[0012] The maximum height h of the protrusion is preferably in the range of 0.2 mm to 3.0 mm. This ensures sufficient adhesion to the inner surface of the tire while fully improving the measurement performance of the functional component provided by the protrusion.
[0013] The difference dH between the minimum h1 and maximum h2 heights of the protrusions is preferably 0.5 mm or less. This allows for effective control of the adhesive layer thickness and provides sufficient suppression of distortion at the base.
[0014] The protrusion is made of vulcanized rubber, and the modulus M of the protrusion when stretched to 100% 100 The pressure is preferably between 0.5 MPa and less than 12.0 MPa. By configuring the protrusions in this way, an excellent reinforcing effect can be obtained from the protrusions, which reduces the impact on functional components when the tire rolls and leads to an improvement in the holding force of the functional components.
[0015] The container is preferably made of vulcanized rubber. Even when such a container is used, the above-described excellent effects can be obtained.
[0016] The functional component is accommodated in the accommodation part, and it is preferable that the functional component 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, remarkable effects can be obtained.
[0017] 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, it can be filled with an inert gas such as air or nitrogen, or other gases inside.
[0018] 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 Description of the Drawings
[0019] [Figure 1] It is a perspective view showing an example of a functional component container according to an embodiment of the present invention. [Figure 2] It is a perspective view showing the bonding surface (back surface) of the functional component container of FIG. 1. [Figure 3] It is a plan view showing the functional component container of FIG. 1. [Figure 4] It is a cross-sectional view taken along the arrow IV-IV of FIG. 3. [Figure 5] It is a plan view showing the bonding surface (back surface) of the functional component container of FIG. 1. [Figure 6] It is a cross-sectional view showing a modified example of the functional component container according to an embodiment of the present invention. [Figure 7] (A) to (E) are plan views showing other modified examples of the protrusion of the functional component container according to an embodiment of the present invention. [Figure 8] (A) to (C) are plan views showing other modified examples of the protrusion of the functional component container according to an embodiment of the present invention. [Figure 9]This is a meridian cross-sectional view showing an example of a pneumatic tire according to an embodiment of the present invention. [Figure 10] This figure shows an example of an output waveform from a piezoelectric element. [Modes for carrying out the invention]
[0020] The configuration of the present invention will be described in detail below with reference to the attached drawings. Figures 1 to 5 show a functional component housing consisting of an embodiment of the present invention.
[0021] As shown in Figures 1 to 5, the functional component 20 is housed inside the housing 10. The housing 10 has a flat base portion 11 fixed to the inner surface of the tire, a cylindrical side wall portion 12 protruding from a position inside the outer edge portion 11e on one side surface 11x (surface) of the base portion 11, a housing portion 13 formed by the base portion 11 and the side wall portion 12, and an opening 14 communicating with the housing portion 13 for inserting and removing the functional component 20. In plan view, the base portion 11 is larger than the side wall portion 12 and has a flange portion 11a outside the side wall portion 12. The housing 10 may be a molded body made of one type of vulcanized rubber, or it may be a molded body made of multiple types of vulcanized rubber. The housing portion 13 is the internal region of the housing 10 excluding the thickness of the opening 14.
[0022] The other side surface 11y (back surface) of the base portion 11 is bonded to the inner surface of the tire via an adhesive layer X. An adhesive or double-sided adhesive tape can be used as the adhesive layer X. At least one projection 15 is provided on the back surface of the base portion 11, protruding from its surface. Additionally, another projection of any shape may be provided within the housing portion 13, protruding from one side surface 11x (front surface) of the base portion 11.
[0023] As shown in Figure 5, such projections 15 are positioned outside the projection region Ra formed by projecting the bottom surface 13x of the housing portion 13 onto the back surface of the base portion 11. In Figure 5, the projections 15 are formed continuously along the outer edge 11e of the base portion 11 and have an annular planar shape. In addition, other projections besides projections 15 may be provided on the back surface of the base portion 11, and if multiple projections are formed on the back surface of the base portion 11, it is sufficient that at least one of these multiple projections is positioned outside the projection region Ra of the bottom surface 13x of the housing portion 13.
[0024] 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 the housing 23. The electronic components can be configured to include various sensors for acquiring tire information, a transmitter, a receiver, a control circuit, and a battery. Examples of tire information acquired by the sensors include the internal temperature and pressure of the pneumatic tire, and the amount of wear on the tread. For example, a temperature sensor and a pressure sensor are used to measure the internal temperature and pressure. When detecting the amount of wear on the tire tread, for example, a sensor element 22 made of a film-like piezoelectric element is placed on the contact surface 21 of the functional component 20, and the sensor element 22 detects an output voltage corresponding to the tire deformation during driving, and the amount of wear on the tread is detected based on that output voltage. In addition, it is also possible to use an acceleration sensor or a magnetic sensor. The sensor element 22 can be placed on either the outer surface or the inner surface of the housing 23.
[0025] In the functional component housing described above, the back surface of the base 11 is the surface to be bonded, and at least one of the protrusions 15 is positioned outside the projection region Ra obtained by projecting the bottom surface 13x of the housing 13 onto the back surface of the base 11. The presence of the protrusion 15 on the back surface of the base 11 suppresses distortion of the base 11 even when pressure is applied during installation of the housing 10, allowing the housing 10 to be fixed in an appropriate state, thereby improving the sensing accuracy of the functional component 20. Furthermore, the presence of the protrusion 15 allows for control of the thickness of the adhesive layer X in the lower region of the housing 13 and suppresses the leakage of adhesive from the lower region of the base 11, improving bonding workability and resulting in a better appearance.
[0026] For example, by applying adhesive locally to the center of the back surface (adhesive surface) of the base 11 and then pressing the housing 10 toward the inner surface of the tire, the adhesive can be spread across the entire adhesive surface. This pushes out any air bubbles remaining on the adhesive surface, allowing the housing 10 to be firmly bonded to the inner surface of the tire. By bonding the housing 10 in this bubble-free state, the housing 10 can be fixed in an appropriate position, which leads to an improvement in the sensing accuracy of the functional component 20.
[0027] In the functional component housing described above, the ratio L2 / L1 of the circumference L1 [mm] of the base 11 to the circumference L2 [mm] of the projection 15 at the outer edge 11e of the base 11 when the projection 15 is projected from the center C of the projection region Ra toward the outer edge 11e of the base 11 is preferably in the range of 0.3 to 1.0, and more preferably in the range of 0.7 to 1.0. For example, in the embodiment shown in Figure 5, the circumference L1 of the base 11 and the circumference L2 of the projection 15 are equal, so the ratio L2 / L1 is 1.0. By setting the ratio L2 / L1 appropriately in this way, the thickness of the adhesive layer X can be controlled while suppressing distortion of the base 11. Note that if multiple projections 15 are provided, the circumference L2 is the sum of their circumferences.
[0028] Furthermore, the maximum height h of the projection 15 (see Figure 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. By appropriately setting the maximum height h of the projection 15 in this way, it is possible to sufficiently ensure adhesion to the inner surface of the tire while also obtaining a sufficient improvement in the measurement performance of the functional component 20 by the projection 15. Note that the maximum height h of the projection 15 is measured from the back surface of the base 11 to the top surface of the projection 15.
[0029] Here, if the maximum height h of the protrusion 15 is 0.2 mm or more, the adhesive strength of the adhesive layer X will not be insufficient, and durability can be improved. On the other hand, if the maximum height h of the protrusion 15 is 3.0 mm or less, the signal output by the functional component 20 will not be obstructed by the thickness of the rubber constituting the housing 10 and the adhesive layer X, and the tire information measurement performance by the functional component 20 can be improved.
[0030] Furthermore, the projection 15 can be made of vulcanized rubber. In addition, the modulus M of the projection 15 when stretched to 100% 100 The pressure is preferably between 0.5 MPa and less than 12.0 MPa, and more preferably in the range of 0.8 MPa to 2.0 MPa. By configuring the projection 15 in this way, an excellent reinforcing effect can be obtained from the projection 15, thereby reducing the impact on the functional component 20 during tire rolling and improving the holding force on the functional component 20. The projection 15 may be made of the same rubber as the housing 10, or it may be made of a different rubber. For example, the projection 15 can be integrally molded with the housing 10 using a molding die for the housing 10, using rubber with a different hardness than the housing 10. Alternatively, the projection 15 may be molded separately from the housing 10 and bonded to the back surface of the base 11. In particular, it is desirable that the projection 15 be integrally molded with the housing 10 using the same rubber as the housing 10.
[0031] Figure 6 shows a modified example of a functional component housing according to an embodiment of the present invention. In practice, when manufacturing a housing with protrusions, even if it is assumed that the protrusions will be of the same height, the heights of the protrusions may differ due to manufacturing variations. Figure 6 shows such a case. Specifically, a plurality of arc-shaped protrusions 15a and 15b are formed on the back surface of the base 11, and the protrusions 15a and 15b have different heights. The height of protrusion 15a is the minimum value h1, while the height of protrusion 15b is the maximum value h2. It is desirable that the protrusions 15a and 15b are of the same height, but even if they are formed at different heights, the difference dH(h2-h1) between the height of protrusion 15a (minimum value h1) and the height of protrusion 15b (maximum value h2) is preferably 0.5 mm or less, and more preferably 0.3 mm or less. It is desirable that this relationship be filled at each part in the circumferential direction in a housing with one protrusion, and between each protrusion in a housing with multiple protrusions.
[0032] By keeping the difference dH within the above range, the thickness of the adhesive layer X can be effectively controlled, and a sufficient suppression effect against the strain of the base 11 can be obtained. However, if the difference dH exceeds 0.5 mm, it becomes difficult to effectively control the thickness of the adhesive layer X, and the suppression effect against the strain of the base 11 tends to decrease.
[0033] Figures 7(A) to 7(E) show other variations of the protrusions of a functional component housing according to an embodiment of the present invention. In Figure 7(A), four protrusions 15 are formed on the back surface of the base 11. Each protrusion 15 has an arc-shaped planar shape, and these arcs are arranged at equal intervals in the circumferential direction along the outer edge 11e of the base 11. In Figure 7(B), four protrusions 15 are formed on the back surface of the base 11. Each protrusion 15 has a rectangular planar shape, and these rectangles are arranged at equal intervals in the circumferential direction. In Figure 7(C), four protrusions 15 are formed on the back surface of the base 11. Each protrusion 15 has a rectangular planar shape, and these rectangles are arranged at equal intervals in the circumferential direction so as to extend from the outer edge 11e of the base 11 toward the center C. In Figure 7(D), four protrusions 15 are formed on the back surface of the base 11. Each protrusion 15 has a circular planar shape, and these circles are arranged at equal intervals in the circumferential direction. In Figure 7(E), a projection 15 is formed on the back surface of the base 11. The projection 15 has an annular planar shape and is positioned between the outer edge 11e of the base 11 and the projection region Ra.
[0034] In particular, it is preferable that at least one of the projections 15 be provided within the outer edge region Rb of the base 11 so as to follow the outer edge 11e of the base 11 (see Figure 7(A)). This outer edge region Rb refers to the area within 20% (e.g., 5 mm) of the radius of the base 11, extending from the outer edge 11e toward the center C. The projection 15 does not need to be in contact with the outer edge 11e of the base 11, as long as it is positioned within the outer edge region Rb. Furthermore, in order to discharge air bubbles remaining on the bonding surface during bonding, it is desirable that the projection 15 has one or more missing parts g in the circumferential direction. By positioning the projection 15 in this way, it is possible to suppress the outflow of adhesive from the lower area of the base 11, and to further improve the appearance. In addition, by appropriately setting the position and height of the projection 15, the projection 15 can be used as a guide for the application position when applying adhesive to the back surface of the base 11, and the amount of adhesive applied can be checked, thereby effectively improving the bonding workability.
[0035] Figures 8(A) to 8(C) show other modifications of the projections of a functional component housing according to an embodiment of the present invention. As shown in Figures 8(A) and 8(B), the back surface of the base 11 has projections 15, which include an outer projection 16 arranged along the outer edge 11e of the base 11, and an inner projection 17 arranged radially apart inside the outer projection 16. Both the outer projection 16 and the inner projection 17 are located outside the projection region Ra. More specifically, in both Figures 8(A) and 8(B), there are four outer projections 16 having an arc-shaped planar shape and four inner projections 17 having an arc-shaped planar shape. Each of these outer projections 16 and inner projections 17 has a circumferentially recessed portion g. In Figure 8(A), the missing portion g of the outer projection 16 and the missing portion g of the inner projection 17 are located at the same circumferential position, so they penetrate from the outer edge 11e towards the center C. In contrast, in Figure 8(B), the missing portion g of the outer projection 16 and the missing portion g of the inner projection 17 are located at different circumferential positions, so they do not penetrate from the outer edge 11e towards the center C. In either case, having the missing portion g allows for the removal of air bubbles remaining on the bonding surface during bonding.
[0036] Furthermore, as shown in Figure 8(C), the back surface of the base portion 11 has projections 15 positioned outside the projection region Ra and auxiliary projections 18 positioned within the projection region Ra. More specifically, there are four projections 15 with an arc-shaped planar form and one auxiliary projection 18 with a circular planar form. The projections 15 have a circumferential cutout g.
[0037] The projection 15 preferably has symmetry with respect to the center C of the projection region Ra or a line L passing through the center C of the projection region Ra (see Figures 7(A)-(E) or 8(A)-(C)). This means that the projection 15 is point-symmetric with respect to the center C of the projection region Ra, and / or line-symmetric with respect to a line L passing through the center C of the projection region Ra. By arranging the projection 15 in this way, the thickness of the adhesive layer X can be controlled while suppressing distortion of the base 11 in the lower region of the functional component 20, thereby improving the sensing accuracy of the functional component 20 and the durability of the housing 10.
[0038] The projection 15 preferably includes at least one outer projection 16 provided along the outer edge 11e of the base 11, and at least one inner projection 17 provided inside the outer projection 16 (see Figures 8(A) and (B)). For example, by applying adhesive to the inside of the inner projection 17 during bonding, distortion of the base 11 in the lower area of the functional component 20 can be effectively suppressed. Furthermore, by appropriately setting the position and height of the outer projection 16 and the inner projection 17, the inner projection 17 can be used as a guide for the application position when applying adhesive to the back surface of the base 11, and the amount of adhesive applied can be checked, thereby effectively improving the bonding workability.
[0039] Figure 9 shows a pneumatic tire according to an embodiment of the present invention. As shown in Figure 9, the pneumatic tire comprises a tread portion 1 that extends in the circumferential direction of the tire and forms an annular shape, a pair of sidewall portions 2 arranged on both sides of the tread portion 1, and a pair of bead portions 3 arranged radially inward of these sidewall portions 2.
[0040] A carcass layer 4 is mounted between a pair of bead sections 3. This carcass layer 4 includes multiple reinforcing cords extending in the radial direction of the tire, which are folded back from the inside to the outside of the tire around the bead core 5 located in each bead section 3. A bead filler 6 made of a rubber composition with a triangular cross-section is placed on the outer circumference of the bead core 5.
[0041] On the other hand, multiple belt layers 7 are embedded on the outer circumference 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 the reinforcing cords are arranged to intersect each other between layers. In the belt layers 7, the inclination angle of the reinforcing cords with respect to the tire circumferential direction is set to, for example, a range of 10° to 40°. Steel cords are preferably used as the reinforcing cords of the belt layers 7. On the outer circumference of the belt layers 7, at least one belt cover layer 8 is arranged, in which the reinforcing cords are arranged at an angle of, for example, 5° or less with respect to the tire circumferential direction, for the purpose of improving high-speed durability. Organic fiber cords such as nylon or aramid are preferably used as the reinforcing cords of the belt cover layer 8.
[0042] The tire internal structure described above is a typical example of a pneumatic tire, but is not limited to this example.
[0043] In the above-described pneumatic tire, a housing 10 containing a functional component 20 having a sensor function for detecting tire information is installed on the back surface of the tread portion 1. Such a functional component housing 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 housing is optional, and the functional component housing may be fixed to the back surface of the tread portion 1 even when the functional component 20 is not housed in the housing portion 13. [Examples]
[0044] Tires were manufactured for a tire size of 185 / 65R15, with a housing having a base, sidewalls, and a housing portion, the back surface of the base fixed to the inner surface of the tire via an adhesive layer, and comparative examples and examples 1-5 with the presence or absence of protrusions, the shape of the protrusions, the ratio L2 / L1, the symmetry of the protrusions, the presence or absence of the protrusions in the outer edge region, and the presence or absence of a double arrangement of outer and inner protrusions as shown in Table 1. The functional component has a sensor function using a piezoelectric element as a sensor element, and the functional component is fixed to the back surface of the tread portion via the housing with an adhesive layer.
[0045] In Examples 1-5, the height of each projection formed on the back surface of the housing is the same (1.0 mm), so the difference in height dH between each projection is zero. In Examples 1-5, each projection has a modulus M when fully extended. 100 It is made of vulcanized rubber with a pressure of 1.5 MPa.
[0046] The adhesive properties and sensing accuracy of these test tires were evaluated using the following test methods, and the results are shown in Table 1.
[0047] Adhesive workability: For each functional component housing, the process of bonding the housing to the inner surface of the tire was repeated 10 times, and the average time required for the bonding process was calculated. The evaluation results are shown as an index using the reciprocal of the calculated value, with the measured value of the comparative example set to 100. A higher index value indicates better bonding workability and easier attachment to the inner surface of the tire.
[0048] Sensing accuracy: Each test tire was mounted on a 15×5.5 rim wheel and placed on a drum testing machine. A driving test was conducted with an air pressure of 230kPa, a load of 60% of the maximum load capacity, and a speed of 30km / h, and 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, as the part of the tread where the functional component is installed makes contact with the ground, negative and positive peaks are sequentially formed in the output of the piezoelectric element over time T, and a peak-to-peak value V is obtained. The average value Vave and standard deviation σ of the peak-to-peak value V of the output waveform obtained for each of the 10 measurements were calculated, and the coefficient of variation CV (CV=σ / Vave) was calculated. The evaluation results are shown as an index using the reciprocal of the coefficient of variation CV, with the comparative example set to 100. A larger index value indicates better sensing accuracy. This type of sensing accuracy was evaluated.
[0049] [Table 1]
[0050] As can be seen from Table 1, the tires of Examples 1 to 5 showed improved adhesive workability and sensing accuracy compared to the comparative example.
[0051] This disclosure encompasses the following inventions [1] to
[11] . The invention [1] is a functional component housing that houses a functional component having a sensor function for detecting tire information, and is bonded to the inner surface of a tire via an adhesive layer, wherein the housing has a flat base, a side wall protruding from a position inward from the outer edge on one side surface of the base, at least one projection protruding from the other side surface of the base, and a housing portion formed by the base and the side wall for housing the functional component, wherein the other side surface of the base is the surface to be bonded, and at least one of the projections is positioned outside the projection area obtained by projecting the bottom surface of the housing portion onto the other side surface of the base. Invention [2] is a functional component housing according to Invention [1], characterized in that the ratio L2 / L1 of the circumference L1 [mm] of the base and the circumference L2 [mm] of the projection at the outer edge of the base when the projection is projected from the center of the projection area toward the outer edge of the base is in the range of 0.3 to 1.0. Invention [3] is a functional component housing according to Invention [1] or [2], characterized in that the projection has symmetry with respect to the center of the projection region or a line passing through the center of the projection region. Invention [4] is a functional component housing according to any one of Inventions [1] to [3], characterized in that at least one of the projections is provided within the outer edge region of the base so as to be along the outer edge of the base. Invention [5] is a functional component housing according to any one of Inventions [1] to [4], characterized in that the projection includes at least one outer projection provided along the outer edge of the base and at least one inner projection provided inside the outer projection. Invention [6] is a functional component housing according to any one of Inventions [1] to [5], characterized in that the maximum height h of the projection is in the range of 0.2 mm to 3.0 mm. Invention [7] is a functional component housing according to any one of Inventions [1] to [6], characterized in that the difference dH between the minimum value h1 and the maximum value h2 of the height of the projection is 0.5 mm or less. The invention [8] is characterized in that the projection is made of vulcanized rubber and the modulus M of the projection when stretched to 100% 100 The functional component housing described in any of the inventions [1] to [7] is characterized in that the pressure is 0.5 MPa or more and less than 12.0 MPa. Invention [9] is a functional component housing according to any one of Inventions [1] to [8], characterized in that the housing is made of vulcanized rubber. Invention
[10] is a functional component housing according to any one of Inventions [1] to [9], characterized in that the functional component is housed in the housing and the functional component has a sensor function using a piezoelectric element as a sensor element. Invention
[11] is a tire characterized in that a functional component housing described in any of Inventions [1] to
[10] is fixed to the back surface of the tread portion. [Explanation of Symbols]
[0052] 1. Tread section 2 Sidewall section 3. Bead section 10 containment units 11 Base 11e Outer edge 11x One side 11y Other side 12 Side wall section 13. Detention Unit 13x bottom 14 Opening 15 Protrusion 20 Functional Parts 21 Contact surface 22 Sensor elements Ra projection area X adhesive layer
Claims
1. A functional component housing comprises a housing that contains a functional component having a sensor function for detecting tire information, and is bonded to the inner surface of the tire via an adhesive layer, The functional component housing comprises a flat base, a side wall protruding from a position inward from the outer edge on one side surface of the base, at least one projection protruding from the other side surface of the base, and a housing portion formed by the base and the side wall for housing the functional component, wherein the other side surface of the base is the surface to be bonded, and at least one of the projections is positioned outside the projected area obtained by projecting the bottom surface of the housing portion onto the other side surface of the base.
2. The functional component housing according to claim 1, characterized in that the ratio L2 / L1 of the circumference L1 [mm] of the base to the circumference L2 [mm] of the projection at the outer edge of the base when the projection is projected from the center of the projection area toward the outer edge of the base is in the range of 0.3 to 1.
0.
3. The functional component housing according to claim 1, characterized in that the projection has symmetry with respect to the center of the projection region or a line passing through the center of the projection region.
4. The functional component housing according to claim 1, characterized in that at least one of the protrusions is provided within the outer edge region of the base so as to be along the outer edge of the base.
5. The functional component housing according to claim 1, characterized in that the projection includes at least one outer projection provided along the outer edge of the base and at least one inner projection provided inside the outer projection.
6. The functional component housing according to claim 1, characterized in that the maximum height h of the projection is in the range of 0.2 mm to 3.0 mm.
7. The functional component housing according to claim 1, characterized in that the difference dH between the minimum value h1 and the maximum value h2 of the height of the projection is 0.5 mm or less.
8. The aforementioned projection is made of vulcanized rubber, and the modulus M of the projection when stretched to 100% 100 The functional component housing according to claim 1, characterized in that the pressure is 0.5 MPa or more and less than 12.0 MPa.
9. The functional component housing according to claim 1, characterized in that the housing is made of vulcanized rubber.
10. The functional component housing according to claim 1, wherein the functional component is housed in the housing portion, and the functional component has a sensor function using a piezoelectric element as a sensor element.
11. A tire characterized in that the functional component housing described in any one of claims 1 to 10 is fixed to the back surface of the tread portion.