tire

Abstract

To provide a tire that is able to prevent damage to a housing body while improving high-speed durability of a functional component.SOLUTION: A tire includes: a functional component 20 having a sensor function that detects tire information; and a housing body 30 in which the functional component 20 is housed. The housing body 30 includes a housing portion 33 for housing the functional component 20; an opening portion 34 communicating with the housing portion 33 and through which the functional component 20 is put in / taken out; and a side wall portion 32 surrounding a periphery of the housing portion 33. At least the side wall portion 32 is made of an elastic material. A volume Vs[cm3] of the functional component 20, a volume Vc[cm3] of the housing portion 33 under no load, and a modulus M50[MPa] at 50% elongation of the elastic material measured based on JIS K6251, satisfy a relation of 0.8≤Vs / Vc×M50≤3.0.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a tire equipped with a functional component having a sensor function for detecting tire information, and more specifically, to a tire that makes it possible to prevent damage to a container while improving the high-speed durability of the functional component. [Background technology]

[0002] A functional component (e.g., a sensor unit including a sensor) that acquires tire internal information such as internal pressure and temperature is installed on the inner surface of a tire (see, for example, Patent Documents 1 and 2). When installing the functional component, a container made of rubber or the like is attached to the inner surface of the tire, and the functional component is housed inside the attached container. However, if the volume of the container is excessively larger than the volume of the functional component, the functional component is not fixed loosely by the container when the functional component is housed in the container, and heat generation increases due to friction between the container and the functional component caused by vibration of the functional component during high-speed driving, resulting in damage to the container or the functional component. On the other hand, if the volume of the container is excessively smaller than the volume of the functional component, excessive deformation occurs in the container during long-distance driving, resulting in a problem of cracks occurring in the container. [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 tire which makes it possible to prevent damage to the container while improving the high-speed durability of functional parts. [Means for solving the problem]

[0005] In order to achieve the above object, the tire of the present invention is provided with a functional part having a sensor function for detecting tire information, and a housing in which the functional part is housed, the housing having a housing section for housing the functional part, an opening communicating with the housing section and for inserting and removing the functional part, and a side wall surrounding the housing section, at least the side wall being made of an elastic material, and the volume Vs [cm 3 ] of the functional part is 3 ] and the unloaded volume of the storage section Vc [cm 3 ] and the modulus M of the material having said elasticity at 50% elongation measured based on JIS K6251 50 [MPa] and is 0.8≦Vs / Vc×M 50 It is characterized in that the relationship of ≦3.0 is satisfied. Effect of the Invention

[0006] In the present invention, the container has a housing portion for housing a functional component, an opening portion communicating with the housing portion and for inserting and removing the functional component, and a side wall portion surrounding the housing portion, at least the side wall portion being made of an elastic material, and the volume Vs [cm 3 ] of the functional component is 3 ] and the unloaded volume of the storage compartment Vc [cm 3 ] and the modulus M of the material at 50% elongation measured based on JIS K6251 50 [MPa] and is 0.8≦Vs / Vc×M 50 By satisfying the relationship of ≦3.0, when a functional part is housed in a housing, vibration of the functional part can be suppressed, heat generation due to friction between the housing and the functional part can be prevented, deformation of the housing can be suppressed, and the crack resistance of the housing can be improved. As a result, damage to the housing can be prevented while improving the high-speed durability of the functional part.

[0007] In the present invention, it is preferable that the volume Vs1 of the upper half of the functional component when the functional component is divided at the midpoint of the height hs from the bottom surface to the top surface of the functional component and the volume Vc1 of the upper half of the accommodation section when the accommodation section is divided at the midpoint of the height hc of the accommodation section satisfy the relationship of 1.0≦Vs1 / Vc1≦1.8. Since the dimensions of the upper half of the functional component greatly contribute to improving high-speed durability, by appropriately setting the ratio Vs1 / Vc1 in this manner, the tightening by the side wall portion can be strengthened, vibration of the functional component can be suppressed, and the high-speed durability of the functional component can be effectively improved.

[0008] It is preferable that the volume Vs2 of the lower half of the functional component when the functional component is divided at the midpoint of the height hs from the bottom surface to the top surface of the functional component and the volume Vc2 of the lower half of the housing section when the housing section is divided at the midpoint of the height hc of the housing section satisfy the relationship of 0.8≦Vs2 / Vc2≦1.3. By appropriately setting the ratio Vs2 / Vc2 in this way, deformation of the base of the side wall section can be suppressed, and the crack resistance of the housing body can be effectively improved.

[0009] It is preferable that the volume Vs of the functional part and the volume Vc of the housing part satisfy the relationship 1.0≦Vs / Vc≦1.5, thereby making it possible to improve the high-speed durability of the functional part and the crack resistance of the housing in a well-balanced manner.

[0010] The width of the opening is narrower than the minimum width of the housing, and the perimeter Ds of the upper part of the functional part u and the circumference of the upper part of the housing Dc u 0.60≦Dc u / Ds u It is preferable that the relationship of ≦0.95 is satisfied. This increases the restraining force of the container against the functional parts and suppresses vibration of the functional parts, thereby preventing damage to the functional parts during high-speed driving. Furthermore, a good balance is achieved between the restraining force of the container against the functional parts and the degree of deformation that does not cause damage to the container, so damage to the container can also be prevented.

[0011] It is preferable that the height hs from the bottom surface to the top surface of the functional part and the height hc of the housing part satisfy the relationship 0.85≦hc / hs≦0.98, which provides a good balance between the restraining force of the housing body on the functional part and the degree of deformation that does not cause damage to the housing body, thereby improving the durability of the functional part during high-speed driving.

[0012] In the present invention, the container is preferably fixed to the back surface of the tread portion. The container is preferably fixed to the back surface of the tread portion by an adhesive. The container is preferably made of one or more types of vulcanized rubber. Even when such a container is used, the above-mentioned excellent effects can be obtained.

[0013] Moreover, it is preferable that the functional part has a sensor function using a piezoelectric element as a sensor element. When a functional part having a sensor function using such a piezoelectric element is used, a remarkable effect can be obtained.

[0014] The tire of the present invention is preferably a pneumatic tire, but may be a non-pneumatic tire. In the case of a pneumatic tire, the inside of the tire can be filled with air, an inert gas such as nitrogen, or other gases. [Brief description of the drawings]

[0015] [Figure 1] 1 is a meridian cross-sectional view showing a pneumatic tire according to an embodiment of the present invention. [Diagram 2] 2 is a plan view showing an installation portion of a functional component in the pneumatic tire of FIG. 1. FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] FIG. 2 is a perspective view showing a functional part and a housing thereof; [Diagram 5] FIG. 2 is a cross-sectional view showing a functional component and its container. [Figure 6] 5 is a half cross-sectional view of the housing for explaining the dimensions of the functional components and the housing. FIG. [Figure 7] 11A and 11B are cross-sectional views showing modified examples of the cross-sectional shape of the functional component. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings, in which: Figures 1 to 5 show a pneumatic tire according to an embodiment of the present invention.

[0017] As shown in FIG. 1, the pneumatic tire of this embodiment includes a tread portion 1 extending circumferentially around the tire to form an annular shape, a pair of sidewall portions 2, 2 arranged on either side of the tread portion 1, and a pair of bead portions 3, 3 arranged radially inward of the sidewall portions 2.

[0018] A carcass layer 4 is mounted between a pair of bead portions 3, 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. The carcass layer 4 includes a main portion 4A which is a portion extending from the tread portion 1 through each sidewall portion 2 to each bead portion 3, and a rolled-up portion 4B which is a portion rolled up around the bead core 5 in each bead portion 3 and extends toward each sidewall portion 2. A bead filler 6 made of a rubber composition having a triangular cross section is disposed on the outer periphery of the bead core 5.

[0019] On the other hand, a plurality of 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 a plurality of reinforcing cords 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, for example, a range of 10° to 40°. As the reinforcing cords of the belt layers 7, steel cords are preferably used. On the outer peripheral side of the belt layers 7, at least one belt cover layer 8 is arranged in which 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. As the reinforcing cords of the belt cover layer 8, organic fiber cords such as nylon and aramid are preferably used.

[0020] It should be noted that the above-described tire internal structure shows a typical example of a pneumatic tire, but is not limited thereto.

[0021] In the pneumatic tire, as shown in FIG. 1, a cylindrical functional part 20 having a sensor function for detecting tire information is provided on the back surface of the tread portion 1.

[0022] As shown in Figs. 2 to 4, the functional part 20 is accommodated inside the container 30. The container 30 has a flat bottom 31 fixed to the back surface of the tread 1, a cylindrical side wall 32 protruding from the bottom 31, a container 33 formed by the bottom 31 and the side wall 32, and an opening 34 communicating with the container 33 for inserting and removing the functional part 20. The side wall 32 surrounds the periphery of the container 33. The container 30 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 container 30 thus configured is fixed to the back surface of the tread 1 by, for example, an adhesive, and the functional part 20 is accommodated in the container 30. The functional part 20 has a contact surface 21 that contacts the back surface side of the tread 1. That is, the contact surface 21 is a surface that contacts the surface of the bottom 31 of the container 30.

[0023] The functional part 20 has a structure in which various electronic components are housed inside a housing. The electronic components can be configured to include various sensors, transmitters, receivers, control circuits, batteries, and the like for acquiring tire information. Examples of tire information acquired by the sensors include the internal temperature and internal pressure of the pneumatic tire, and the amount of wear of the tread portion. For example, a temperature sensor or a pressure sensor is used to measure the internal temperature and internal pressure. When detecting the amount of wear of the tread portion, for example, a sensor element 22 made of a piezoelectric element is disposed on the contact surface 21 of the functional part 20, and the sensor element 22 detects an output voltage corresponding to tire deformation during running, and detects the amount of wear of the tread portion 1 based on the output voltage. In addition, an acceleration sensor or a magnetic sensor can also be used.

[0024] In the above pneumatic tire, among the members constituting the container 30, at least the side wall portion 32 is made of an elastic material. Examples of the elastic material include rubber and elastomer. In addition, the volume Vs [cm 3 ] and the unloaded volume Vc [cm 3 ] and the modulus M of a material with elasticity at 50% elongation 50 [MPa] is 0.8≦Vs / Vc×M 50 ≦3.0. In particular, 1.0≦Vs / Vc×M 50 It is preferable that the relationship be ≦2.0.

[0025] Here, the volume Vs of the functional part 20 includes the volume for the thickness of the housing, and is the volume within the height hs of the functional part 20 (the volume corresponding to the hatched area of ​​the functional part 20 in FIG. 5). The height hs of the functional part 20 is measured when the functional part 20 is housed in the housing 30, and is the height of the part of the functional part 20 housed in the housing section 33. This means that, for example, a knob part may be provided on the top of the functional part 20 to make it easier to hold the functional part 20, and when this knob part protrudes from the housing section 33 after housing, the height hs of the functional part 20 does not include the height of the part of the knob part outside the housing section 33. On the other hand, the volume Vc of the housing section 33 does not include the volume for the thickness of the opening 34, and is the volume within the height hc of the housing section 33 (the volume corresponding to the hatched area of ​​the housing section 33 in FIG. 5). The height hc of the accommodating section 33 is measured when the functional part 20 is not accommodated in the accommodating body 30, and is the total inner height from the upper surface of the bottom 31 to the lower surface of the engaging portion 32e bent toward the opening 34 in the side wall portion 32.

[0026] In addition, the modulus M of an elastic material at 50% elongation 50 In the present invention, the modulus M of the elastic material at 50% elongation is preferably in the range of 0.5 MPa to 4.0 MPa, and more preferably in the range of 0.8 MPa to 2.0 MPa. 50 is measured in accordance with JIS K6251.

[0027] In the above-described pneumatic tire, the housing 30 has a housing portion 33 for housing the functional component 20, an opening 34 that communicates with the housing portion 33 and allows the functional component 20 to be inserted and removed, and a side wall portion 32 that surrounds the housing portion 33. At least the side wall portion 32 is made of an elastic material, and the volume Vs [cm 3 ] of the functional component 20 is 3 ] and the unloaded volume Vc [cm 3 ] and the modulus M of a material with elasticity at 50% elongation 50 [MPa] and is 0.8≦Vs / Vc×M 50 By satisfying the relationship ≦3.0, when the functional component 20 is housed in the housing 30, vibration of the functional component 20 can be suppressed, heat generation due to friction between the housing 30 and the functional component 20 can be prevented, deformation of the housing 30 can be suppressed, and the crack resistance of the housing 30 can be improved. As a result, damage to the housing 30 can be prevented while the high-speed durability of the functional component 20 is improved.

[0028] Here, Vs / Vc×M 50 If the calculated value of Vs / Vc×M is less than 0.8, the functional parts 20 are not fixed by the housing 30 when they are housed in the housing 30, and therefore the functional parts 20 move within the housing 30 during high-speed driving, which causes friction between the housing 30 and the functional parts 20 to increase heat generation, making the housing 30 or the functional parts 20 more likely to be damaged. 50 If the calculated value exceeds 3.0, the functional part 20 will be tightly fixed by the housing 30 when the functional part 20 is housed in the housing 30, causing excessive deformation of the housing 30 during long-distance driving, making the housing 30 more susceptible to cracks.

[0029] In the above pneumatic tire, as shown in FIG. 5, when the functional part 20 is divided at a middle position Ps of the height hs from the bottom surface to the top surface of the functional part 20 (a height position of 0.5×hs from the bottom surface), the volume Vs1 [cm 3 ] and the volume Vc1 [cm 3 ] of the upper half of the storage section 33 when the storage section 33 is divided at the middle position Pc (height position of 0.5×hc from the bottom surface) of the height hc of the storage section 33. 3It is preferable that the ratio Vs1 / Vc1 satisfies the relationship 1.0≦Vs1 / Vc1≦1.8. Since the dimension of the upper half of the functional component 20 has a large contribution to improving high-speed durability, by appropriately setting the ratio Vs1 / Vc1 in this manner, the fastening by the side wall portion 32 is strengthened, vibration of the functional component 20 is suppressed, and the high-speed durability of the functional component 20 can be effectively improved.

[0030] Furthermore, when the functional part 20 is divided at the midpoint Ps of the height hs of the functional part 20, the volume Vs2 [cm 3 ] and the volume Vc2 [cm 3 ] of the lower half of the storage section 33 when the storage section 33 is divided at the middle position Pc of the height hc of the storage section 33. 3 It is preferable that the ratio Vs2 / Vc2 satisfies the relationship 0.8≦Vs2 / Vc2≦1.3. By appropriately setting the ratio Vs2 / Vc2 in this manner, deformation of the base of the side wall portion 32 can be suppressed, and the crack resistance of the housing body 30 can be effectively improved.

[0031] Furthermore, it is preferable that the volume Vs of the functional part 20 and the volume Vc of the housing section 33 satisfy the relationship 1.0≦Vs / Vc≦1.5. That is, the intention is to increase the restraining force of the housing body 30 by setting the volume Vs of the functional part 20 larger than the volume Vc of the housing section 33 within a specific range. By appropriately setting the ratio Vs / Vc in this manner, it is possible to improve the high-speed durability of the functional part 20 and the crack resistance of the housing body 30 in a well-balanced manner.

[0032] In the above pneumatic tire, the width w1 of the opening 34 (see FIG. 3) is narrower than the minimum width w2 of the storage portion 33 (see FIG. 3), and the perimeter Ds of the upper portion of the functional component 20 is u and the perimeter Dc of the upper part of the storage section 33 u 0.60≦Dc u / Ds u It is preferable that the relationship of Dc≦0.95 is satisfied. That is, the circumferential length Dc of the upper part of the storage portion 33 is u The perimeter Ds of the upper part of the functional part 20 uThe purpose of this is to increase the restraining force of the container 30 by setting the perimeter Dc of the upper part of the container 33 small within a specific range. u 6, the perimeter Ds of the upper part of the functional component 20 is calculated by measuring the perimeter of the housing section 33 at three positions, i.e., at the position of the height h1 and at a position equivalent to ±25% (0.25×h1) of the height h1, before the functional component 20 is housed in the housing section 33, and averaging the perimeters measured at these three positions. u is obtained by measuring the perimeter of the functional component 20 at positions corresponding to the above three positions on the functional component 20 and averaging the perimeters measured at these three positions.

[0033] In this way, the perimeter Ds of the functional part 20 u and the circumference Dc of the housing portion 33 u By appropriately setting, the binding force of the housing 30 on the functional parts 20 can be increased and vibration of the functional parts 20 can be suppressed, thereby preventing damage to the functional parts 20 during high-speed driving. Furthermore, since there is a good balance between the binding force of the housing 30 on the functional parts 20 and the degree of deformation that does not cause damage to the housing 30, damage to the housing 30 can also be prevented.

[0034] Here, the ratio Dc u / Ds u If the ratio Dc is less than 0.60, the restraining force of the housing 30 will be large, but the degree of deformation of the side wall portion 32 will also increase, so that the housing 30 may crack during long-distance driving, increasing the possibility of the housing 30 being damaged. u / Ds u If the ratio exceeds 0.95, the restraining force of the housing 30 will be reduced and the vibration of the functional component 20 within the housing 30 will increase, resulting in increased heat generation due to friction between the housing 30 and the functional component 20, leading to damage to the functional component 20.

[0035] Furthermore, it is preferable that the height hs of the functional component 20 and the height hc of the housing section 33 satisfy the relationship 0.85≦hc / hs≦0.98. By appropriately setting the height hs of the functional component 20 and the height hc of the housing section 33 in this manner, a good balance is achieved between the restraining force of the housing body 30 on the functional component 20 and the degree of deformation that does not cause damage to the housing body 30, and the durability of the functional component 20 during high-speed driving can be improved.

[0036] Here, if the ratio hc / hs is less than 0.85, the locking portion 32e of the side wall portion 32 cannot accommodate the functional component 20 so as to cover it, and therefore the effect of improving the durability of the functional component 20 during high-speed driving is reduced. Conversely, if the ratio hc / hs is greater than 0.98, the binding force of the housing 30 is weakened and the vibration of the functional component 20 within the housing 30 becomes large, and therefore the effect of improving the durability of the functional component 20 during high-speed driving cannot be sufficiently obtained.

[0037] In the present invention, the volume Vs of the functional part 20, the volume Vc of the container 30, and the modulus M 50 As long as the specific relationships are satisfied with respect to the dimensions and the like, the shape of the functional component 20 is not particularly limited. In addition to the cross-sectional shape having a substantially rectangular shape as shown in Fig. 5, examples of the cross-sectional shape include a stepped cross-sectional shape in which the upper half of the functional component 20 is narrower than the lower half as shown in Fig. 7(a), a stepped cross-sectional shape in which the upper half of the functional component 20 is wider than the lower half as shown in Fig. 7(b), a cross-sectional shape whose width gradually decreases toward the lower part of the functional component 20 as shown in Fig. 7(c), and a cross-sectional shape whose width gradually decreases from the middle position of the height of the functional component 20 toward the upper and lower parts as shown in Fig. 7(d). EXAMPLES

[0038] In a tire having a tire size of 225 / 45R18, which is equipped with a functional part having a sensor function for detecting tire information and a housing in which the functional part is housed, and the functional part has a sensor function using a piezoelectric element as a sensor element, the volume Vs of the functional part, the volume Vc of the housing, and the modulus M 50 , Vs / Vc×M 50, functional part volume Vs1, accommodation part volume Vc1, ratio Vs1 / Vc1, functional part volume Vs2, accommodation part volume Vc2, ratio Vs2 / Vc2, ratio Vs / Vc, ratio Dc u / Ds u Tires of Comparative Examples 1 and 2 and Examples 1 to 12 were manufactured with the ratio hc / hs set as shown in Table 1. The functional parts were attached to the back surface of the tread portion via a container made of one type of vulcanized rubber, and the container was fixed to the inner surface of the tire with an adhesive.

[0039] For these test tires, the high-speed durability of the functional parts and the crack resistance of the container were evaluated by the following test methods. The results are also shown in Table 1.

[0040] High speed durability (functional parts): Each test tire was mounted on a wheel with a rim size of 18 x 7.5, and a running test was carried out on a drum test machine under the condition of a load of 88% of the maximum load capacity and an air pressure of 360 kPa. Specifically, the speed was increased by 10 km / h every 10 minutes from an initial speed of 120 km / h, and the maximum speed at which the functional parts could operate normally was measured. The evaluation results were shown as an index, with the measured value of Comparative Example 1 being set at 100. The higher the index value, the better the high-speed durability.

[0041] Crack resistance (container): Each test tire was mounted on a wheel with a rim size of 18 x 7.5, and after aging treatment in an oxygen atmosphere at 80°C for 5 days, a running test was performed using a drum test machine under the conditions of a load of 80% of the maximum load capacity and an air pressure of 250 kPa. Specifically, the speed was increased by 10 km / h every 24 hours from an initial speed of 120 km / h until a speed of 170 km / h was reached, and the occurrence of cracks or wrinkles in the container was visually confirmed. The evaluation results were shown in four stages: "◎ (excellent)" if there were no cracks or wrinkles, "○ (good)" if the wrinkle length was within 1 mm, "△ (passable)" if the wrinkle length was between 1 mm and 5 mm, and "× (unacceptable)" if there were cracks.

[0042] [Table 1]

[0043] As can be seen from Table 1, the tires of Examples 1 to 12 had improved high-speed durability of the functional parts and crack resistance of the container, in comparison with the comparative example.

[0044] Comparative Example 2 is Vs / Vc×M defined in the present invention. 50 Since the value was set to be larger than the upper limit of the numerical range, the high-speed durability of the functional parts was improved, but the effect of improving the crack resistance of the container could not be sufficiently obtained.

[0045] The present disclosure includes the following inventions [1] to

[10] . Invention [1] is a tire having a functional part having a sensor function for detecting tire information, and a housing in which the functional part is housed, the housing having a housing section for housing the functional part, an opening communicating with the housing section and for inserting and removing the functional part, and a side wall section surrounding the housing section, at least the side wall section being made of an elastic material, and the volume Vs [cm 3 ] of the functional part is 3 ] and the unloaded volume of the storage section Vc [cm 3 ] and the modulus M of the material having said elasticity at 50% elongation measured based on JIS K6251 50 [MPa] and is 0.8≦Vs / Vc×M 50 The tire is characterized in that it satisfies the relationship of ≦3.0. Invention [2] is the tire according to invention [1], characterized in that the volume Vs1 of the upper half of the functional part when the functional part is divided at a midpoint of the height hs from the bottom surface to the top surface of the functional part, and the volume Vc1 of the upper half of the accommodating section when the accommodating section is divided at a midpoint of the height hc of the accommodating section satisfy the relationship 1.0≦Vs1 / Vc1≦1.8. Invention [3] is a tire according to invention [1] or [2], characterized in that the volume Vs2 of the lower half of the functional part when the functional part is divided at a midpoint of the height hs from the bottom surface to the top surface of the functional part, and the volume Vc2 of the lower half of the accommodating section when the accommodating section is divided at a midpoint of the height hc of the accommodating section satisfy the relationship 0.8≦Vs2 / Vc2≦1.3. Invention [4] is the tire according to any one of inventions [1] to [3], characterized in that the volume Vs of the functional part and the volume Vc of the storage portion satisfy the relationship 1.0≦Vs / Vc≦1.5. The invention [5] is such that the width of the opening is narrower than the minimum width of the housing portion, and the perimeter Ds of the upper portion of the functional component is u and the perimeter Dc of the upper part of the storage portion u and 0.60≦Dc u / Ds u The tire according to any one of the inventions [1] to [4] is characterized in that it satisfies the relationship of ≦0.95. Invention [6] is a tire according to any one of inventions [1] to [5], characterized in that the height hs from the bottom surface to the top surface of the functional component and the height hc of the accommodating portion satisfy the relationship 0.85≦hc / hs≦0.98. The invention [7] is the tire according to any one of the inventions [1] to [6], characterized in that the container is fixed to a back surface of the tread portion. The invention [8] is the tire according to any one of the inventions [1] to [7], characterized in that the container is fixed to the back surface of the tread portion by an adhesive. The invention [9] is the tire according to any one of the inventions [1] to [8], characterized in that the container is made of one or more types of vulcanized rubber. Invention

[10] is the tire according to any one of inventions [1] to [9], characterized in that the functional part has a sensor function using a piezoelectric element as a sensor element. [Explanation of symbols]

[0046] 1 Tread section 2 Sidewall 3 Bead section 20 Functional parts 21 Contact surface 22 Sensor element 30 Containment Unit 31 Bottom 32 Side wall 33 Storage unit 34 Opening

Claims

1. A tire having a functional part having a sensor function for detecting tire information and a housing in which the functional part is housed, The container has a housing portion for housing the functional component, an opening portion communicating with the housing portion and for inserting and removing the functional component, and a side wall portion surrounding the housing portion, at least the side wall portion being made of an elastic material, and the volume Vs [cm 3 ] of the functional component 3 ] and the unloaded volume of the storage section Vc [cm 3 ] and the modulus M of the material having said elasticity at 50% elongation measured based on JIS K6251 50 [MPa] and 0.8≦Vs / Vc×M 50 A tire which satisfies the relationship ≦3.

0.

2. 2. The tire according to claim 1, characterized in that a volume Vs1 of an upper half of the functional part when the functional part is divided at a midpoint of a height hs from a bottom surface to a top surface of the functional part and a volume Vc1 of an upper half of the storage section when the storage section is divided at a midpoint of a height hc of the storage section satisfy a relationship of 1.0≦Vs1 / Vc1≦1.

8.

3. 3. The tire according to claim 1, wherein a volume Vs2 of a lower half of the functional part when the functional part is divided at a midpoint of a height hs from a bottom surface to a top surface of the functional part and a volume Vc2 of a lower half of the storage section when the storage section is divided at a midpoint of a height hc of the storage section satisfy a relationship of 0.8≦Vs2 / Vc2≦1.

3.

4. The tire according to claim 1 or 2, wherein a volume Vs of the functional part and a volume Vc of the storage portion satisfy a relationship of 1.0≦Vs / Vc≦1.

5.

5. The width of the opening is narrower than the minimum width of the housing portion, and the perimeter Ds of the upper portion of the functional component u and the perimeter Dc of the upper part of the storage portion u and 0.60≦Dc u / Ds u 3. The tire according to claim 1, wherein the relationship is satisfied: ≦0.

95.

6. 3. The tire according to claim 1, wherein a height hs from a bottom surface to an upper surface of the functional component and a height hc of the accommodating portion satisfy a relationship of 0.85≦hc / hs≦0.

98.

7. The tire according to claim 1 or 2, wherein the container is fixed to a back surface of the tread portion.

8. 3. The tire according to claim 1, wherein the container is fixed to the back surface of the tread portion by an adhesive.

9. 3. The tire according to claim 1, wherein the container is made of one or more types of vulcanized rubber.

10. 3. The tire according to claim 1, wherein the functional part has a sensor function using a piezoelectric element as a sensor element.

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