JP2016088473A - Tire assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire assembly in which a generating body is assembled, in particular, a tire assembly which achieves protection of electronic equipment.SOLUTION: A tire assembly is equipped with a tire, a generating body, and electronic equipment. The generating body includes a first electrode structure 15 having a first electrode 11 and a second electrode structure 16 having a second electrode 12, and a fixing part 17 which so fixes the first electrode structure and the second electrode structure that a distance of facing each other becomes variable. At least one of the electrode structures has a charged body for generating a static electricity on a counterface surface side. Outer peripheries of the first electrode structure and the second electrode structure are fixed by the fixing part, and a distance of facing each other is so made as to be variable. In addition, the electronic equipment is protected in such a manner that the equipment is embedded in the fixing part.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a tire assembly in which a power generation body and an electronic device that receives power supply from the power generation body are incorporated in a tire.

  2. Description of the Related Art A power generator that converts mechanical vibration energy into electric energy using an electrostatic effect is known. Patent Document 1 proposes a tire assembly in which a power generation body using a piezoelectric effect is incorporated in a tire. Patent Document 2 proposes a power generator using an electret having a charging effect. Furthermore, as in Non-Patent Document 1, a frictional charging type power generator has been proposed in which resins are contact-charged and the electric field is used.

JP 2006-151372 A JP 2014-27756 A

Sihong Wang et al., Nano Lett., 2012,12 (12), pp 6339-6346

  These power generators are expected to be used as power sources for electronic devices such as tire pressure monitoring sensors (TPMS). However, the environment inside the tire is very severe in terms of humidity, temperature, pressure, and acceleration experienced by the inclusions incorporated in the tire. Therefore, in addition to protecting the built-in power generator from the above environment, the power generator of the control device that controls the power supply from the power generator to the electronic device and executes processing of data output from the electronic device; There is a problem that it is difficult to ensure connection reliability.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a tire assembly that realizes frictional charging type power generation by a power generator together with protection of an electronic device.

  The invention disclosed herein employs the following technical means to achieve the above object. Note that the reference numerals in parentheses described in the claims and in this section indicate a corresponding relationship with specific means described in the embodiments described later as one aspect, and limit the technical scope of the invention. Not what you want.

  To achieve the above object, the present invention provides a tire (100) assembled to the outer periphery of a wheel, a power generator (220) disposed on the tire and generating a voltage by deformation of the tire, and power supply by the power generator And an electronic device (210) for detecting a physical quantity related to the tire, wherein the power generation body has a first electrode (11) made of a conductive metal, and the tire A first electrode structure (15) fixed to the first electrode, a second electrode structure (16) having a second electrode (12) arranged opposite to the first electrode and made of a conductive metal, and electrical insulation The opposing distance between the first electrode structure and the second electrode structure is maintained at a predetermined interval without any deformation of the tire, and the first is accompanied by the deformation of the tire. An electrode structure and a second electrode structure; The first electrode structure and the second electrode structure in order to generate static electricity due to friction between the first electrode and the second electrode. At least one has a charged body (13, 14) on the mutually opposing surfaces of the first electrode and the second electrode, and the first electrode structure and the second electrode structure are brought into contact with each other due to deformation of the tire. Static electricity is generated, and the first electrode structure and the second electrode structure are separated from each other due to deformation of the tire, and a voltage is generated between the first electrode and the second electrode. It is electrically connected to the first electrode and the second electrode, embedded in the fixed portion, and protected by the fixed portion.

  According to this, the fixing portion exhibits a function of fixing the first electrode structure and the second electrode structure so that they can repeat contact and separation with each other, and the electronic device is embedded in the fixing portion. Demonstrate the function to protect. Therefore, it is possible to realize frictional charging type power generation by the power generator and at the same time to protect the electronic device.

It is sectional drawing which shows schematic structure of the tire assembly which concerns on 1st Embodiment. FIG. 2 is a detailed view of a region II in FIG. 1 and a cross-sectional view showing details of the tire assembly. It is a top view which shows the structure of a sensor apparatus. It is a figure which follows the IV-IV line in FIG. 3, and is sectional drawing which shows the structure of a sensor apparatus. It is a circuit diagram which shows the electric power generation principle by an electric power generation body, and the path | route of the electric power supply to an electronic device. It is a block diagram which shows the structure of the sensor apparatus which concerns on 2nd Embodiment. It is a top view which shows the structure of a sensor apparatus. It is a perspective view which shows the antenna pattern which concerns on the modification 1. FIG. 10 is a cross-sectional view illustrating a configuration of a sensor device according to Modification Example 2. FIG. It is sectional drawing which shows the structure of the sensor apparatus which concerns on 3rd Embodiment. It is sectional drawing which shows the structure of the sensor apparatus which concerns on the modification 3. It is sectional drawing which shows the detailed structure of the tire assembly which concerns on 4th Embodiment. It is sectional drawing which shows the detailed structure of a tire assembly. It is sectional drawing which shows the detailed structure of a tire assembly. It is sectional drawing which shows the detailed structure of a tire assembly. It is sectional drawing which shows the structure of the sensor apparatus which concerns on other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same reference numerals are given to the same or equivalent parts.

(First embodiment)
Initially, with reference to FIGS. 1-5, the schematic structure of the tire assembly which concerns on this embodiment is demonstrated.

  The tire assembly in the present embodiment is provided for a vehicle, for example, and is used for the vehicle to move by a frictional force with a road surface. The tire assembly is formed by integrally forming a tire and a power generation body. The power generation body converts mechanical energy due to deformation of the tire accompanying movement of the vehicle into electrical energy, charges a battery mounted on the vehicle, and drives electronic devices such as various sensors.

  FIG. 1 illustrates a cross section along the rotation axis L of the tire 100. FIG. 2 is an enlarged view of a region II in FIG. 1, and shows only the front left portion of the tire 100 when the vehicle upper direction is the traveling direction of the vehicle.

  As shown in FIG. 1, the tire assembly 10 in the present embodiment includes a tire 100 and a sensor device 200 that is attached to the inside of the tire 100 and attached.

  As shown in FIG. 1, the tire 100 is fixed to the wheel rim 300 so as to surround the wheel rim 300 of the wheel. As shown in FIG. 2, the tire 100 can be described by being divided into a tread portion 100A, a shoulder portion 100B, a sidewall portion 100C, and a bead portion 100D. The tread portion 100A is a portion in contact with the road surface, and the tire resin body 110 described later has the largest thickness. The shoulder portion 100B is a portion adjacent to the tread portion 100A, and contacts the road surface when the vehicle performs a turning motion. The sidewall portion 100C is a portion adjacent to the shoulder portion 100B, and does not contact the road surface, but is a portion that bends for the purpose of alleviating the impact received from the road surface. The bead portion 100 </ b> D is a portion that fixes the tire 100 to the wheel rim 300.

  As shown in FIG. 2, the tire 100 holds the tire resin body 110 that is elastically deformable, the belt 120 that reinforces the tire resin body 110 to improve rigidity, the tire resin body 110, and the tire 100 receives. And a carcass 130 for improving durability against load and impact.

  The tire resin body 110 is made of a mixture containing synthetic rubber or natural rubber as a main component and a compounding agent such as carbon or sulfur, and is elastically deformable. The tire resin body 110 is fixed to the wheel rim 300 at the bead portion 100 </ b> D so that a hollow portion 400 for filling air is formed between the tire resin body 110 and the wheel rim 300.

  The belt 120 is formed in a belt shape by knitting a metal wire, for example, a steel wire, and is embedded in the tire resin body 110. The belt 120 is stretched in the circumferential direction (rotating direction) of the tire 100 on a portion from the tread portion 100A through the shoulder portion 100B to a part of the sidewall portion 100C.

  The carcass 130 is made of, for example, a polyamide-based or polyester-based fiber, and is embedded between the belt 120 and the hollow portion 400 in the tire resin body 110. The carcass 130 is formed to extend from the left bead portion 100 </ b> D to the right bead portion (not shown) in the traveling direction, and functions as a skeleton of the tire 100.

  Further, the tire 100 has a bead 140 in the bead portion 100D. The bead 140 has a structure in which high carbon steel is bundled. This bead 140 fixes the tire resin body 110 to the wheel rim 300 and also fixes both ends of the carcass 130.

  Next, a schematic configuration of the sensor device 200 will be described with reference to FIGS.

  As shown in FIG. 2, the sensor device 200 is affixed to the inside of the tire 100 and is disposed in a hollow portion 400 that is formed by being surrounded by the tire 100 and the wheel rim 300. The sensor device 200 in the present embodiment is fixed to the sidewall portion 100 </ b> C of the tire 100. As described above, the sensor device 200 constitutes the tire assembly 10 together with the tire 100.

  In the present embodiment, a total of four sensor devices 200 are attached to the left and right sidewall portions 100C of the tire 100 with respect to the traveling direction of the vehicle. An object to be sensed by the sensor device 200 can be arbitrarily selected by a designer, but examples of the physical quantity of the object include the pressure in the tire, the acceleration caused by the rotation of the tire 100, and the temperature inside or on the surface of the tire 100. .

  In the present embodiment, an example in which the sensor device 200 is disposed on the sidewall portion 100C of the tire 100 will be described, but any of the tread portion 100A, the shoulder portion 100B, the sidewall portion 100C, and the bead portion 100D. Can also be arranged.

  Hereinafter, the sensor device 200 will be described in detail. In each of FIGS. 3 and 4, the sensor device 200 is orthogonal to the x direction, the y direction orthogonal to the x direction, and the xy plane defined by the x direction and the y direction. Define the z direction. As defined in this definition, the x direction, the y direction, and the z direction are in a primary independent relationship.

  As shown in FIGS. 3 and 4, the sensor device 200 has a rectangular shape extending along the xy plane and has a thickness in the z direction. The sensor device 200 includes an electronic device 210 for detecting a physical quantity and a power generator 220 for supplying electric power to the electronic device 210.

  The electronic device 210 is a pressure sensor for detecting the atmospheric pressure inside the tire 100, for example. As shown in FIG. 5, the electronic device 210 has a battery 212 for supplying stable power to the sensor body 211 and a diode 213 for full-wave rectification in addition to the sensor body 211 that detects pressure. ing. Detailed operation of power supply from the power generator 220 to the electronic device 210 will be described later.

  As shown in FIG. 4, the power generator 220 includes a flat plate-like first electrode 11 along the xy plane, a second electrode 12 that faces the first electrode 11 in the z direction, and a fixing portion that fixes these outer peripheral portions. 17. A first charging body 13 is formed as a charging body on the surface of the first electrode 11 facing the second electrode 12. The first electrode 11 and the first charged body 13 are joined together to form an integrated first electrode structure 15. Although the charged body is not bonded to the second electrode 12 in the present embodiment, a configuration in which the second charged body is bonded to the surface facing the first charged body 13 may be adopted. With such a configuration, the second electrode 12 and the second charged body are joined together to form an integrated second electrode structure 16. In the present embodiment, since the second charged body is not formed, the second electrode 12 corresponds to the second electrode structure 16 described in the claims.

  As a constituent material of the first electrode structure 15, for example, a polyimide resin or dimethylpolysiloxane (PDMS) as the first charged body 13 is adopted, and gold (Au) or aluminum (Al) is used as the first electrode 11. Can be adopted. On the other hand, as the constituent material of the second electrode structure 16, gold (Au) or aluminum (Al) can be adopted as the second electrode 12. In addition, if the 2nd electrode structure 16 is the structure which has a charging body (2nd charging body), nylon can be employ | adopted as a 2nd charging body. The materials of the first electrode 11, the second electrode 12, the first charged body 13, and the second charged body can be arbitrarily selected. Any material may be used as long as it is a combination that generates static electricity when it repeatedly contacts and separates from each other. However, in the case where each of the pair of electrode structures 15 and 16 has a charged body, In the triboelectric charging train known in the above, it is preferable to employ those which are separated from each other.

  As shown in FIG. 5, the electronic device 210 is electrically connected to the first electrode 11 and the second electrode 12. In the present embodiment, the connection between the electronic device 210 and the first electrode 11 and the second electrode 12 is realized via a conductive adhesive 214 as shown in FIG. The current supplied from the power generator 220 is full-wave rectified via four diodes 213 connected in a bridge and supplied to the power of the sensor body 211 or contributes to charging of the battery 212.

  The electronic device 210 is disposed in a facing space formed between the first electrode 11 and the second electrode 12 facing each other in the z direction. The electronic device 210 has a terminal on the surface facing each of the electrodes 11 and 12, and the terminal and the first electrode 11 and the second electrode 12 are electrically connected to each other via the conductive adhesive 214. It is connected. The electronic device 210 is interposed in a part of the facing space between the first electrode 11 and the second electrode 12, and by extension, the first electrode structure 15 and the second electrode structure 16. For this reason, a gap AG is formed between the first electrode structure 15 and the second electrode structure 16 in a region excluding the arrangement region of the electronic device 210.

  The fixing portion 17 is a member that fixes the outer peripheral portions of the first electrode structure 15 and the second electrode structure 16 to each other. Specifically, in the outer periphery of the first electrode structure 15 and the second electrode structure 16 that are rectangular, the fixing portion 17 is between the first electrode structure 15 and the second electrode structure 16. The electrode structures 15 and 16 are fixed to each other so as to fill the opposing space.

  The first electrode structure 15 and the second electrode structure 16 have a film shape that can be freely deformed in the z direction with a portion fixed by the fixing portion 17 as a fixed end. In other words, when the power generation body 220 receives an external force, the electrode structures 15 and 16 are displaced in the z direction so that the opposing distance changes. The power generator 220 is attached to the inside of the tire 100 with a surface along the xy plane as an adhesive surface. In the present embodiment, one surface of the first electrode structure 15 is attached to the inside of the tire 100. For this reason, each electrode structure 15, 16 changes its shape according to the deformation of the tire 100. Therefore, the opposing distance between the first electrode structure 15 and the second electrode structure 16 is variable according to the deformation of the tire 100 except for the portion fixed by the fixing portion 17. The first electrode structure 15 comes into contact with or is separated from the second electrode structure 16 by changing the facing space with the second electrode structure 16.

  The fixing portion 17 covers and protects the electronic device 210 in addition to the function of fixing the first electrode structure 15 and the second electrode structure 16 to each other and forming a gap. As shown in FIG. 3, the electronic device 210 according to the present embodiment is disposed at one corner of the four corners of the rectangular first electrode 11 and the second electrode 12. The fixing portion 17 is formed on the outer peripheral portions of the first electrode 11 and the second electrode. When the fixing portion 17 is molded, the fixing portion 17 is molded so that the electronic device 210 is buried. As a result, the electronic device 210 is surrounded by the fixed portion 17 and can be resistant to external dust and contact.

  In addition, the fixing | fixed part 17 in this embodiment is formed also in the surface on the opposite side of the space | gap AG among the surfaces along xy plane of each electrode 11 and 12. FIG. That is, the fixing portion 17 is formed so as to surround the entire first electrode structure 15, second electrode structure 16, electronic device 210, and conductive adhesive 214 in a state where a space serving as the gap AG is opened. Yes.

  The fixing portion 17 preferably employs, for example, a silicone-based soft resin because it displaces the facing distance between the first electrode structure 15 and the second electrode structure 16. The sensor device 200 is affixed to the inside of the tire 100 as an integral module protected by being covered with the fixing portion 17.

  Next, the principle of power generation in the sensor device 200 will be described with reference to FIGS. 4 and 5.

  When the tire 100 comes into contact with the road surface, the stress received by the tread portion 100A is transmitted to the sidewall portion 100C and contributes to the deformation of the sidewall portion 100C. When the tread portion 100A is not in contact with the road surface, the deformation amount of the sidewall portion 100C is small, and the facing distance between the first electrode structure 15 and the second electrode structure 16 in the power generation body 220 maintains a predetermined interval. doing.

  On the other hand, when the tread portion 100A contacts the road surface and the sidewall portion 100C is deformed, the power generator 220 is compressed in a direction along the xy plane. Thereby, the facing distance in the gap AG becomes smaller or larger. In other words, the first electrode structure 15 and the second electrode structure 16 approach or separate from each other.

  If the first electrode structure 15 and the second electrode structure 16 come into contact with each other and the static electricity is generated when the opposing distance is reduced, charges are accumulated in the first charged body 13. In this state, when the tread portion 100A is separated from the road surface, the sidewall portion 100C attempts to return to the original state. For this reason, the opposing distance between the first electrode structure 15 and the second electrode structure 16 returns to a predetermined interval. When the tread portion 100A comes into contact with the road surface again and the sidewall portion 100C is deformed, the power generator 220 is compressed in the direction along the xy plane and the facing distance changes.

  Since the tire 100 in the traveling vehicle is always in a rotational motion, one point on the tread portion 100A repeats contact and separation with the road surface. That is, the sidewall portion 100 </ b> C repeats expansion and contraction periodically as the tire 100 rotates. In other words, the first electrode structure 15 and the second electrode structure 16 repeat contact and separation substantially periodically.

  Hereinafter, although the principle of power generation will be described, it is assumed that the first electrode 11 and the second electrode 12 are parallel plates that maintain parallel to each other in consideration of the simplicity of the description.

  When the first charged body 13 and the second electrode 12 come into contact with each other, static electricity is generated. When the surface density (hereinafter, referred to as charge density) of the generated charge is σ, the electric field E generated between the first electrode 11 and the second electrode 12 is E = σ / ε. Here, ε is a dielectric constant as a whole in consideration of each dielectric constant of the gas present in the first charged body 13 and the gap AG.

なお、Ｃは、第１電極１１と第２電極１２とを電極とみなしたときのコンデンサの静電容量であり、Ｓは第１電極１１および第２電極１２のｘｙ平面に沿う面の面積である。 On the other hand, the potential difference V between the first electrode 11 and the second electrode 12 is V = Ed because the electric field E is constant. Here, as shown in FIG. 5, d is a facing distance when the first charged body 13 and the second electrode 12 are separated from each other. Therefore, when the first charged body 13 and the second electrode 12 are in contact with each other and are charged with the charge density σ, the energy U accumulated in the first charged body 13 is separated until the opposing distance becomes d. Is represented by Equation 1.

C is the capacitance of the capacitor when the first electrode 11 and the second electrode 12 are regarded as electrodes, and S is the area of the surface along the xy plane of the first electrode 11 and the second electrode 12. is there.

  The energy U accumulated in the first charged body 13 becomes electric power accumulated in the battery 212 or supplied to the sensor main body 211. Thus, in this embodiment, the power generation body 220 and the electronic device 210 constitute a system that can autonomously generate power and detect physical quantities.

  According to Equation 1, the energy U is proportional to the facing distance d between the first charged body 13 and the second electrode 12. Therefore, the sensor device 200 can generate electric power by repeating contact and separation between the first charged body 13 and the second electrode 12 due to deformation of the tire 100. The power generator 220 in the sensor device 200 has a simple configuration in which the pair of electrode structures 15 and 16 are simply overlapped, and it is not necessary to use a piezoelectric body that is the main cause of high cost. Can be suppressed. Further, when a piezoelectric body is used as in the prior art, since the expansion and contraction of a highly rigid piezoelectric body is used for power generation, the piezoelectric body may cause stress cracking due to aged deterioration or the like. On the other hand, the power generator 220 is configured to include the second electrode structure 16 that is relatively variable with respect to the first electrode structure 15, so that stress cracking and the like do not occur. For this reason, the durability of the sensor device 200 can be improved.

  Further, according to Equation 1, the energy U is proportional to the area S of the first electrode 11 and the second electrode 12. Conventionally, it was possible to increase the amount of power generation by increasing the size of the piezoelectric body, but there was a problem that the cost was significantly increased. On the other hand, since the sensor device 200 according to the present embodiment does not use a piezoelectric body that is a main cause of high cost, the electrodes 11 and 12 and thus the electrode structures 15 and 16 are suppressed while suppressing costs. The area can be increased easily.

  Further, according to Equation 1, the energy U is proportional to the square of the charge density σ. That is, the amount of charge increases as the amount of charge increases. Therefore, the amount of power generation can be adjusted by selecting the constituent materials for the charging body 13 and the electrodes 11 and 12.

  Next, the effect of the fixing | fixed part 17 which concerns on this embodiment is demonstrated.

  The fixing portion 17 is fixed to the first electrode structure 15 and the second electrode structure 16 and the outer peripheral portions thereof. Thereby, the air gap AG can be formed near the center of the first electrode structure 15 and the second electrode structure 16. Due to the presence of the air gap AG, the first electrode structure 15 and the second electrode structure 16 become film-like and can be displaced in the z direction. The second electrode structures 16 can be brought into contact with or separated from each other. Therefore, mechanical energy generated by the rotation of the tire 100 can be converted into electrical energy.

  Further, the fixing portion 17 covers and protects the electronic device 210. As shown in FIG. 3, the electronic device 210 according to the present embodiment is disposed at one corner of the four corners of the rectangular first electrode 11 and the second electrode 12. The fixing portion 17 is formed on the outer peripheral portions of the first electrode 11 and the second electrode. When the fixing portion 17 is molded, the fixing portion 17 is molded so that the electronic device 210 is buried. As a result, the electronic device 210 is surrounded by the fixed portion 17, and resistance to external dust and contact can be ensured.

  In addition, since the electronic device 210 is directly attached to the first electrode 11 and the second electrode 12 via the conductive adhesive 214, the electronic device 210 is compared with a mode in which a wire material such as a bonding wire is used for electrical connection to each other. Connection reliability can be improved.

  In the sensor device 200, the power generator 220 that supplies electric power and the electronic device 210 that detects the physical quantity are integrally formed while being covered with the fixed portion 17. It can be used as an autonomous module that is not required.

(Second Embodiment)
In addition to the first embodiment, the tire assembly 10 may include a wireless communication device 500 that transmits and receives information to and from the outside. Specifically, as illustrated in FIG. 6, the wireless communication device 500 is connected to the electronic device 210 so as to be communicable. To a control device (ECU or the like) placed outside the computer. The power supply to the wireless communication device 500 is configured to be performed from the power generator 220 in the same manner as the supply to the sensor main body 211.

  As shown in FIG. 7, the wireless communication device 500 is arranged as a separate device from the electronic device 210. Similarly to the electronic device 210, the wireless communication device 500 is disposed in a space facing the first electrode 11 and the second electrode 12, and has a terminal on a surface facing each of the electrodes 11, 12, the terminal, The first electrode 11 and the second electrode 12 are electrically connected to each other through a conductive adhesive 214. The fixing unit 17 is configured to cover and protect the wireless communication device 500 in addition to the electronic device 210. Further, the signal from the electronic device 210 is configured to be input by a flexible wiring, a bonding wire, or the like.

  According to this, since the physical quantity acquired by the electronic device 210 can be output wirelessly, the tire assembly 10 and the external control device can be connected without requiring a mechanism corresponding to the rotational motion such as a slip ring. It can be connected so that it can communicate. In addition, mechanical deterioration of the wiring due to the rotational movement of the tire 100 does not occur compared to the case of connecting by wire. That is, the connection reliability between the tire assembly 10 and the external control device can be improved. Moreover, since the fixing | fixed part 17 is formed so that the radio | wireless communication apparatus 500 may be coat | covered with the electronic device 210, the function which protects the radio | wireless communication apparatus 500 can be exhibited.

(Modification 1)
The wireless communication device 500 includes an antenna 510 that transmits / receives information to / from the outside. Although the shape and arrangement of the antenna 510 are not particularly limited, it may be configured such that the first electrode 11 or the second electrode 12 in the power generation body 220 also functions as the antenna 510 as in this modification.

  Specifically, as shown in FIG. 8, the first electrode 11 or the second electrode 12 has an antenna pattern patterned for the antenna 510. The antenna pattern is formed of the same constituent material as the electrodes 11 and 12, and can be formed by patterning by etching after the electrodes 11 and 12 are formed, for example. The antenna pattern is formed so as to be electrically insulated from a portion functioning as an electrode.

  In addition, the part shown with the broken line in FIG. 8 is a part by which the element of the electronic device 210 and the radio | wireless communication apparatus 500 is arrange | positioned. Moreover, in order to make the shape of the antenna pattern easy to understand, the side walls of the electrodes 11 and 12 and the antenna 510 are hatched.

  Since the antenna pattern is formed on the metal part constituting the first electrode 11 or the second electrode 12, the wireless communication apparatus 500 can use the electrodes 11 and 12 as the antenna 510 without preparing the antenna 510 separately. Can do. That is, the first electrode 11 or the second electrode 12 can serve as both an electrode function and an antenna function, and a layout area required when the antenna 510 is separately formed can be suppressed.

(Modification 2)
In 2nd Embodiment and its modification 1, the example which the electronic apparatus 210 and the radio | wireless communication apparatus 500 are arrange | positioned in the opposing space of the 1st electrode 11 and the 2nd electrode 12 as a separate element was shown. However, as shown in FIG. 9, the electronic device 210 and the wireless communication device 500 are configured as an integrated circuit device 600 that is integrally packaged, and then disposed in a space between the first electrode 11 and the second electrode 12. It is good to do so.

  The integrated circuit device 600 is formed, for example, by forming the electronic device 210 and the wireless communication device 500 on the same substrate and molding them integrally. Therefore, the wiring for connecting the electronic device 210 and the wireless communication device 500 to each other can be shortened as compared with the configuration in which the electronic device 210 and the wireless communication device 50 are configured separately from each other. Noise characteristics can be improved. In addition, since the electronic device 210 and the wireless communication device 500 can be connected to each other as a wiring pattern on the substrate without using a flexible wiring or a bonding wire, the connection reliability can be improved.

  As in the electronic device 210 in the first embodiment, since the integrated circuit device 600 is interposed in the space between the first electrode structure 15 and the second electrode structure 16, the first electrode structure 15 and the first electrode structure 15 A gap AG can be formed between the two-electrode structures 16. For this reason, similarly to the first embodiment, it is possible to perform power generation accompanying the deformation of the tire 100 while maintaining the connection reliability of the integrated circuit device 600 with the first electrode 11 and the second electrode 12.

(Third embodiment)
In each of the embodiments described above, the electronic device 210 or the integrated circuit device 600 is formed by the opposing space between the first electrode 11 and the second electrode 12, that is, the first electrode structure 15 and the second electrode structure 16. An example is shown in which it is arranged in the opposite space. On the other hand, in this embodiment, an example in which the electronic device 210 or the integrated circuit device 600 is disposed outside the facing space formed by the first electrode structure 15 and the second electrode structure 16 will be described. . In addition, since the structure of the electric power generation body 220 is the same as the structure demonstrated in 1st Embodiment, the description is abbreviate | omitted.

  10 and 11 referred to in the following description, the electronic device 210 is illustrated as a power supply destination of the power generator 220, but the electronic device 210 can be replaced with the integrated circuit device 600.

  The sensor device 200 in this embodiment is different from the first embodiment in that the first electrode 11, the second electrode 12, and the electronic device 210 are replaced by a conductive member 215 that resists deformation instead of the conductive adhesive 214. Electrically connected. Specifically, as shown in FIG. 10, the electronic device 210 is arranged away from the facing space between the first electrode 11 and the second electrode 12, and is separated from two terminals provided in the electronic device 210. A flexible wiring 215a extending to each of the first electrode 11 and the second electrode is formed. The flexible wiring 215a corresponds to the conductive member 215, and the first electrode 11 and the second electrode 12 and the electronic device 210 are electrically connected by the flexible wiring 215a.

  Also in this embodiment, the fixing | fixed part 17 is formed so that the electronic device 210 may be buried while fixing the outer peripheral part of the 1st electrode 11 and the 2nd electrode 12. FIG. Thereby, the fixing | fixed part 17 can protect the electronic apparatus 210 with respect to the dust and contact from the outside while enabling the contact and separation | spacing with the 1st electrode structure 15 and the 2nd electrode structure 16 to be possible. .

(Modification 3)
With respect to an example in which the electronic device 210 or the integrated circuit device 600 is disposed outside the facing space formed by the first electrode structure 15 and the second electrode structure 16, in this modification, another conductive member 215 is provided. The configuration will be described.

  As shown in FIG. 11, the present invention can also be applied to an element molded with a thermosetting resin such as an epoxy resin. The electronic device 210 in this modification is insert-molded together with a lead frame 215c that is in electrical contact with the electronic device 210 via a bonding wire 215b. The electronic device 210, the bonding wire 215b, and the lead frame 215c are molded with a molding material 18 made of a thermosetting resin. The lead frame 215 c has two lead frames 215 c, one that should be connected to the first electrode 11 and one that should be connected to the second electrode 12, partially protruding from the molding material 18. The two lead frames 215c in this modification are formed side by side in the y direction. In FIG. 11, they are formed on the front side and the back side of the page. For example, the lead frame 215c on the front side of the page and the first electrode 11 are connected via the flexible wiring 215a. On the other hand, the lead frame 215c on the back side of the drawing is connected to the first electrode 11 via the flexible wiring 215a. In this modification, the conductive member 215 described in the claims refers to the whole of the flexible wiring 215a, the bonding wire 215b, and the lead frame 215c.

  The fixing portion 17 in this modification is formed so as to bury the molding material 18 holding the electronic device 210 therein. According to this, the electronic device 210 is protected by both the fixing portion 17 and the molding material 18. In this modification, the fixing portion 17 and the molding material 18 correspond to the fixing portion described in the claims.

(Fourth embodiment)
In the above-described embodiments, the configuration in which the sensor device 200 is attached to the inside of the tire 100 has been described. On the other hand, the sensor device 200 may be embedded in the tire resin body 110 in the tire 100.

  As shown in FIG. 12, the tire assembly 10 in the present embodiment is configured by simply embedding the sensor device 200 described in the first to third embodiments in the tire resin body 110.

  As shown in FIG. 12, even when the sensor device 200 is embedded in the tire resin body 110, the mechanical energy generated by the deformation of the tire 100 can be converted into electrical energy by the power generator 220. Note that, by configuring the sensor device 200 to be embedded in the tire resin body 110, some components of the tire 100 can be shared with the components of the sensor device 200.

  For example, as shown in FIG. 13, the constituent material of the fixing portion 17 and the constituent material of the tire resin body 110 can be used in common. Thereby, cost can be reduced compared with the case where the fixing | fixed part 17 and the tire resin body 110 are procured as a separate material. In addition, since the sensor device 200 can be simultaneously molded when the tire 100 is molded, the number of processes can be reduced.

  In another example, as shown in FIG. 14, the constituent material of the first charged body 13 and the constituent material of the tire resin body 110 can be used in common. In this case, a part of the tire resin body 110 passes through the fixing portion 17 and comes into contact with the first electrode 11.

  Furthermore, the belt 120 may be shared by the first electrode 11 or the second electrode 12 and both. Specifically, as shown in FIG. 15, the belt 120 includes a first belt 120a and a second belt 120b, the first belt 120a and the first electrode 11 are shared, and the second belt 120b. And the second electrode 12 are shared. Further, in the example shown in FIG. 15, the fixing portion 17 and the tire resin body 110 are also shared.

(Other embodiments)
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In each of the above-described embodiments, the example in which the second electrode structure 16 is configured only by the second electrode 12 has been described. However, as illustrated in FIG. 16, the surface of the second electrode 12 that faces the first charged body 13. Further, the second charged body 14 may be formed. The materials of the first charged body 13 and the second charged body 14 can be arbitrarily selected. Any material may be used as long as it is a combination that generates static electricity when it repeats contact and separation from each other, but materials that are separated from each other in generally known triboelectric trains may be employed.

  Further, in each of the above-described embodiments, the pressure sensor that detects the atmospheric pressure inside the tire 100 is illustrated as the electronic device 210. However, as a physical quantity to be sensed, acceleration generated by rotation of the tire 100 in addition to the atmospheric pressure in the tire. The temperature of the inside or the surface of the tire 100 can be taken as an example. Needless to say, physical quantities are not limited to these.

  In each of the above-described embodiments, the configuration in which the electronic device 210 includes the battery 212 has been described. However, the power generated by the power generator 220 is also supplied to the sensor main body 211, and thus the battery 212 is not necessarily required.

DESCRIPTION OF SYMBOLS 10 ... Tire assembly, 11 ... 1st electrode, 12 ... 2nd electrode, 13 ... 1st charged body, 15 ... 1st electrode structure, 16 ... 2nd electrode structure, 17 ... Fixing part, 100 ... Tire, 200 ... sensor device, 210 ... electronic device, 220 ... electric generator

Claims (9)

A tire (100) assembled to the outer periphery of the wheel;
A power generator (220) disposed on the tire and generating a voltage by deformation of the tire;
An electronic device (210) that operates by receiving power supplied from the power generation body and detects a physical quantity related to the tire, and a tire assembly,
The power generator is
A first electrode structure (15) having a first electrode (11) made of a conductive metal and fixed to the tire;
A second electrode structure (16) having a second electrode (12) disposed opposite to the first electrode and made of a conductive metal;
It is formed using an electrically insulating material, and the opposing distance between the first electrode structure and the second electrode structure is maintained at a predetermined interval in a state where the tire is not deformed. A fixing portion (17) for holding the first electrode structure and the second electrode structure so as to be close to or away from each other in accordance with the deformation;
In order to generate static electricity due to friction between the first electrode and the second electrode, at least one of the first electrode structure and the second electrode structure is in contact with each other in the first electrode and the second electrode. Having a charged body (13, 14) on the opposite surface of
Due to the deformation of the tire, the first electrode structure and the second electrode structure are brought into contact with each other to generate static electricity, and further, due to the deformation of the tire, the first electrode structure and the second electrode structure are Spaced apart and configured to generate a voltage between the first electrode and the second electrode,
The tire assembly is characterized in that the electronic device is electrically connected to the first electrode and the second electrode, is embedded in the fixing portion, and is protected by the fixing portion. The electronic device is disposed in a part of a region where the first electrode and the second electrode face each other, and is electrically connected to both electrodes by sandwiching the first electrode and the second electrode,
Between the first electrode structure and the second electrode structure, a gap (AG) is formed in a part of the region excluding the region where the electronic device is disposed without deformation of the tire, The tire assembly according to claim 1, wherein the facing distance is maintained at a predetermined interval. The electronic device is disposed outside a facing space formed by the first electrode structure and the second electrode structure, and the first electrode and the second electrode are connected to each other via a conductive member (215). Electrically connected,
An air gap (AG) is formed between the first electrode structure and the second electrode structure except for a region fixed by the fixing portion in a state where the tire is not deformed. The tire assembly according to claim 1, wherein the facing distance is maintained at a predetermined interval.   The tire assembly according to any one of claims 1 to 3, further comprising a wireless communication device (500) that transmits information detected by the electronic device to the outside.   5. The device according to claim 4, wherein at least one of the first electrode and the second electrode has an antenna pattern used for wireless communication, and functions as an electrode and an antenna (510). Tire assembly. The electronic device and the wireless communication device are formed as an integrated circuit device (600) packaged together,
5. The integrated circuit device according to claim 4, wherein the integrated circuit device is electrically connected to the first electrode and the second electrode, embedded in the fixed portion, and protected by the fixed portion. The tire assembly according to claim 5. The integrated circuit device is disposed in a part of a region where the first electrode and the second electrode face each other, and is electrically connected to both electrodes by sandwiching the first electrode and the second electrode. ,
An air gap (AG) is formed between the first electrode structure and the second electrode structure, except for a region where the integrated circuit device is disposed, in a state where the tire is not deformed. The tire assembly according to claim 6, wherein the facing distance is maintained at a predetermined interval. The integrated circuit device is disposed outside a facing space formed by the first electrode structure and the second electrode structure, and a conductive member (215) is interposed between the first electrode and the second electrode. Are electrically connected,
An air gap (AG) is formed between the first electrode structure and the second electrode structure except for a region fixed by the fixing portion in a state where the tire is not deformed. The tire assembly according to claim 6, wherein the facing distance is maintained at a predetermined interval.   The tire assembly according to any one of claims 1 to 8, wherein a constituent material of a part of the tire also serves as the charged body or the fixing portion.

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