JP2021023075A - Vibration power generator - Google Patents

Abstract

To provide a vibration power generator with a new mounting structure for a vibration source.SOLUTION: A vibration power generator 10 that amplifies vibration energy of a vibration source 42 and converts it to electric energy has a vibration power generation unit 12 that converts the vibration energy input from the vibration source 42 into electrical energy, a mass member 24 that supports the vibration power generation unit 12, and a viscoelastic body 38 that elastically connects the mass member 24 and the vibration source 42. A mounting unit 40b that mounts the mass member 24 to the vibration source 42 is composed of the viscoelastic body 38.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vibration power generation device that converts vibration energy transmitted from a vibration source into electrical energy.

Conventionally, a vibration power generation device that converts vibration energy transmitted from a vibration source into electrical energy and extracts it has been known. The vibration power generation device includes, for example, a vibration power generation unit provided with an energy conversion element such as a piezoelectric element or a magnetostrictive element, and vibration energy input to the vibration power generation unit is converted into electrical energy.

By the way, in order to efficiently generate power from the vibration energy of the vibration source, the vibration power generation device uses the vibration source and the vibration power generation as shown in, for example, International Publication No. 2012/137695 (Patent Document 1). A resonance system for amplifying vibration may be provided between the parts. That is, the piezoelectric power generation device of Patent Document 1 includes a resonator in which the first weight member is supported via a spring means as such a resonance system. Then, the spring means is attached to the vibration source via the base member, and the vibration energy amplified by the resonator is attached to the main surface of the diaphragm by the deformation of the diaphragm fixed to the first weight member. It is input to the generated power generation element.

International Publication No. 2012/137695

However, Patent Document 1 merely discloses the piezoelectric power generation device itself, and does not study the mounting structure to the vibration source.

In order to attach the hard base member to the vibration source, bolt fixing, magnetic fixing, welding, etc. can be considered. However, when fixing with bolts, it is necessary to form a bolt hole corresponding to the base member in the vibration source. Further, fixing by magnetic force or welding may be difficult to adopt depending on the material and surface shape of the vibration source.

An object of the present invention is to provide a vibration power generation device provided with a novel mounting structure for a vibration source.

Hereinafter, preferred embodiments for grasping the present invention will be described, but each of the embodiments described below is described as an example, and not only can be appropriately combined with each other and adopted, but also described in each embodiment. The plurality of components of the above can be recognized and adopted independently as much as possible, and can be appropriately adopted in combination with any of the components described in another embodiment. Thereby, in the present invention, various other aspects can be realized without being limited to the aspects described below.

The first aspect is a vibration power generation device, which is a vibration power generation unit that converts vibration energy input from a vibration source into electrical energy, a mass member that supports the vibration power generation unit, the mass member, and the vibration source. It has a viscoelastic body that elastically connects the above, and the attachment portion for attaching the mass member to the vibration source is configured by the viscoelastic body.

According to the vibration power generation device having a structure according to this embodiment, the mass member supporting the vibration power generation unit is attached to the vibration source by the attachment portion provided on the viscoelastic body. Therefore, a special metal fitting or the like for attaching the mass member to the vibration source is not essential, and the vibration power generation device can be attached to the vibration source by a simple structure with a small number of parts.

Since the mounting portion is provided on the viscoelastic body, the mass member is elastically connected to the vibration source by mounting the viscoelastic body on the vibration source at the mounting portion. As described above, since the member provided with the attachment portion is a viscoelastic body, the mass member and the vibration source are not fixed to each other but are elastically connected to each other by attachment to the vibration source. As a result, since the mass-spring resonance system is constructed, excellent power generation efficiency is realized by amplifying the vibration energy due to the resonance of the mass-spring resonance system.

Since the viscoelastic body is directly attached to the vibration source at the attachment portion, for example, even if the surface of the vibration source has irregularities due to uneven coating, the attachment portion provided on the viscoelastic body follows the irregularities of the vibration source. And transform. As a result, the vibration power generator can be attached to the vibration source without any problem.

In the second aspect, in the vibration power generation device described in the first aspect, the viscoelastic body is elastically deformable in a state of being attached to the vibration source.

According to the vibration power generation device having a structure according to this embodiment, the vibrating elastic body can be elastically deformed without being restrained by the vibration source in a fixed state. At the time of elastic deformation, the stress due to the elastic deformation of the mounting portion is dispersed. As a result, the durability of the viscoelastic body can be improved, and the desired elastic support characteristics can be stably expressed.

The third aspect is the vibration power generation device according to the first or second aspect, wherein the attachment portion of the viscoelastic body includes an adhesive surface to be adhered to the vibration source. ..

According to the vibration power generation device having a structure according to this embodiment, the viscoelastic body is easily attached to the vibration source by adhering the adhesive surface constituting the attachment portion to the vibration source.

The fourth aspect is the vibration power generation device according to any one of the first to third aspects, wherein the viscoelastic body has a structure having bubbles.

According to the vibration power generation device having a structure according to this embodiment, the viscoelastic body is easily deformed by having bubbles, and the spring of the viscoelastic body becomes soft. As a result, for example, even if the viscoelastic body is thin, the resonance frequency can be tuned to a lower frequency in the resonance system of the vibration power generation device using the viscoelastic body as a spring.

In the fifth aspect, in the vibration power generation device according to any one of the first to fourth aspects, the viscoelastic body has a plurality of laminated structures.

According to the vibration power generation device having a structure according to this embodiment, the elasticity and viscosity (damping) of the viscoelastic body can be easily adjusted by adjusting the number of layers of the viscoelastic body and the characteristics of each layer. Therefore, the resonance frequency of the mass-spring resonance system of the vibration power generation device can be easily adjusted according to the frequency of the input vibration from the vibration source.

A sixth aspect is the vibration power generation device according to any one of the first to fifth aspects, wherein the plurality of viscoelastic bodies are provided independently of each other.

According to the vibration power generation device having a structure according to this aspect, the mass member is supported at a plurality of places by a plurality of viscoelastic bodies. As a result, the mass member is supported more stably by the viscoelastic body without the support area of the mass member by the viscoelastic body becoming larger than necessary. As a result, the vibration in the direction contributing to power generation is efficiently amplified, and the power generation efficiency is improved.

A seventh aspect is the vibration power generation device according to any one of the first to sixth aspects, wherein the mass member is a first split body on the vibration power generation unit side and a second on the viscoelastic body side. It has a divided structure in which the divided bodies of the above are connected to each other in a detachable manner.

According to the vibration power generation device having a structure according to this aspect, the first division on the vibration power generation part side is divided into the second while the second division on the viscoelastic body side is left attached to the vibration source. By removing it from the body, the vibration power generation unit can be removed from the vibration source. This simplifies, for example, the work of replacing the vibration power generation unit with another one according to a change in the required power generation amount, or replacing the vibration power generation unit with a new vibration power generation unit when the vibration power generation unit fails.

Since it is not necessary to remove the viscoelastic body from the vibration source when replacing the vibration power generation unit, for example, when the viscoelastic body is attached to the vibration source with a strong adhesive force, the viscoelastic body becomes It can be prevented from being damaged by removal from the vibration source.

In the eighth aspect, in the vibration power generation device according to any one of the first to seventh aspects, an urging means for pressing the attachment portion of the viscoelastic body against the vibration source is provided. is there.

According to the vibration power generation device having a structure according to this embodiment, the mounting portion of the viscoelastic body is pressed against the vibration source by the urging means, so that the mounting strength of the viscoelastic body to the vibration source at the mounting portion is further increased. obtain. As the urging means, for example, a metal spring or a magnet is adopted.

A ninth aspect is the vibration power generation device according to any one of the first to eighth aspects, which has a locking portion in which the mounting portion of the viscoelastic body is locked to the vibration source. It is what you are doing.

According to the vibration power generation device having a structure according to this embodiment, the viscoelastic body is easily attached to the vibration source by mechanically locking the locking portion with respect to the vibration source. Further, by adopting the attachment structure to the vibration source by the locking portion, the viscoelastic body can be easily removed from the vibration source.

According to the present invention, it is possible to provide a vibration power generation device having a novel mounting structure for a vibration source.

It is sectional drawing which shows the vibration power generation apparatus as the 1st Embodiment of this invention, and is the figure corresponding to the I-I sectional drawing of FIG. Top view of the vibration power generator shown in FIG. 1 with the lid removed. Model diagram of the vibration power generator shown in FIG. A graph showing the frequency characteristics of the amount of power generated by the vibration power generator shown in FIG. Sectional drawing which shows the vibration power generation apparatus as the 2nd Embodiment of this invention. Sectional drawing which shows the vibration power generation apparatus as the 3rd Embodiment of this invention. Sectional drawing which shows the vibration power generation apparatus as the 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a vibration power generation device 10 as a first embodiment of the present invention. The vibration power generation device 10 includes a vibration power generation unit 12 that converts vibration energy into electrical energy. In the following description, the vertical direction means, in principle, the vertical direction in FIG.

The vibration power generation unit 12 has a structure in which the leaf spring 16 is cantilevered by a rectangular block-shaped support member 14, and mass members 18 are attached to both sides of the free end of the leaf spring 16. There is. Then, a power generation unit resonance system 20 which is a mass-spring resonance system in which the mass members 18 and 18 are masses and the leaf spring 16 is a spring is configured. The resonance frequency of the power generation unit resonance system 20 is set according to the frequency of the main vibration in the vertical direction input from the vibration source 42 described later to the vibration power generation device 10. In the present embodiment, the mass members 18 are attached to both the upper and lower surfaces of the leaf spring 16, but only one of the mass members 18 may be provided.

A power generation element 22 is overlapped and fixed to the leaf spring 16. As the power generation element 22, an element such as a piezoelectric element that generates an electric charge by applying a mechanical stress is preferably adopted. However, it is also possible to employ a magnetostrictive element, for example, to extract power based on changes in the magnetic field with respect to the action of mechanical stress.

Then, the mass member 18 is displaced in the vertical direction relative to the support member 14 due to the vibration input in the vertical direction, and the leaf spring 16 elastically bends in the thickness direction, so that the leaf spring 16 is superposed on the leaf spring 16. Mechanical stress is applied to the power generation element 22. As a result, the vibration energy is converted into electrical energy in the power generation element 22, and power generation is performed based on the vibration input to the vibration power generation unit 12.

A wiring (not shown) is connected to the power generation element 22, and the electric power generated through the wiring is taken out to the outside. The wiring is connected to, for example, a storage battery (not shown), and the generated power is stored in the storage battery. The wiring can also be connected to a device that requires power so that the generated power is supplied to the device.

The vibration power generation unit 12 is supported in a housing 24 as a mass member in a housed state. The housing 24 has a rectangular hollow box shape. The housing 24 is composed of a housing body 26 having an opening at the upper side and a rectangular plate-shaped lid 28 covering the opening of the housing body 26.

The housing body 26 has a split structure in which the bottom wall portion is vertically divided. The upper side of the housing body 26 above the divided portion is the first divided body 30 that is the vibration power generation unit 12 side, and the lower side of the divided portion is the second divided body that is the adhesive sheet 38 side described later. It is said to be 32. The connecting bolt 34 penetrating the bottom wall portion of the first divided body 30 is screwed into a screw hole (not shown) of the second divided body 32, so that the first divided body 30 and the second divided body 32 are combined. They are interconnected. The first divided body 30 and the second divided body 32 can be separated by removing the connecting bolt 34, and are detachably connected to each other. The connecting structure of the first divided body 30 and the second divided body 32 may be detachable, for example, an engagement that engages with the first divided body 30 and the second divided body 32. By providing the portion, a connecting structure can also be formed by mechanical engagement.

The vibration power generation unit 12 is arranged inside the peripheral wall portion of the first partition body 30, and the support member 14 is fixed to the bottom wall portion of the first partition body 30 so that the housing body 26 accommodates the vibration power generation unit 12. It is supported by. The method of fixing the support member 14 to the first divided body 30 is not particularly limited, and for example, adhesion, welding, bolt fixing, uneven fitting, or the like can be adopted.

An adhesive sheet 38 as a viscoelastic body is attached to the lower surface 36 of the second divided body 32 of the housing body 26. The adhesive sheet 38 has a rectangular sheet shape, and is a double-sided adhesive sheet having adhesiveness on both the upper and lower surfaces. The upper surface of the adhesive sheet 38 is an adhesive surface 40a, and the lower surface is an adhesive surface 40b as a mounting portion.

The structure, material, manufacturing method, etc. of the adhesive sheet 38 are not particularly limited. That is, the pressure-sensitive adhesive sheet 38 can be configured by providing various known pressure-sensitive adhesive layers on the surface of an elastic body layer made of, for example, a resin-based or rubber-based elastic body or a foam thereof. As the pressure-sensitive adhesive layer, for example, a rubber-based, acrylic-based, urethane-based, silicone-based, or other pressure-sensitive adhesive, a hot-melt type pressure-sensitive adhesive, or the like can be adopted depending on various conditions.

Specifically, for example, the pressure-sensitive adhesive sheet 38 of the present embodiment has a structure in which a pressure-sensitive adhesive layer using urethane resin as a main raw material is provided on both sides of a base material made of an elastic body of a urethane foam sheet. In the present embodiment, the base material of the pressure-sensitive adhesive sheet 38 is a foam and has bubbles, but instead of or in addition to that, the pressure-sensitive adhesive layer may have bubbles. The pressure-sensitive adhesive sheet 38 of the present embodiment has a three-layer structure in which pressure-sensitive adhesive layers are formed on both sides of the foam sheet as described above in the state of use with the release sheet removed. The adhesive sheet 38 is shown in a single layer for readability.

The thickness of the adhesive sheet 38 depends on the material and size of the sheet, the vibration conditions of the vibration source, the mass and size of the housing 24 and the mass member 18, etc., but secures the deformation characteristics for forming the vibration system. In general, it is desirable that the thickness is 0.2 mm to 1 mm in consideration of ease of manufacture and the like. However, as will be described later, since it is possible to use a plurality of pressure-sensitive adhesive sheets 38 in a laminated manner, the practical upper limit of the thickness dimension is not limited. The 25% compressive hardness of the pressure-sensitive adhesive sheet 38 is preferably 0.01 to 1.5 MPa, more preferably 0.05 to 1.0 MPa, and even more preferably 0.07 to 0.8 MPa. The expansion ratio of the base material of the pressure-sensitive adhesive sheet 38 is preferably 1.05 to 5.00 times.

Then, the adhesive sheet 38 is attached to the second divided body 32 by attaching the upper adhesive surface 40a, which is the upper surface of the adhesive layer, to the lower surface 36 of the second divided body 32. In the present embodiment, as shown by the broken line in FIG. 2, four adhesive sheets 38, 38, 38, 38 that are independent of each other are fixed to the four corners of the lower surface 36 of the second divided body 32.

In the present embodiment, the adhesive sheet 38 has adhesive surfaces 40a and 40b on both sides, and the adhesive sheet 38 is attached to the lower surface 36 of the second split body 32 by the adhesive surface 40a. However, for example, even if an adhesive sheet having only an adhesive surface 40b on one side is adopted as a viscoelastic body and the surface of the adhesive sheet other than the adhesive surface 40b is fixed to the second divided body 32 by an adhesive. good. In short, the method of attaching the adhesive sheet 38 to the housing 24 is not particularly limited, and for example, the adhesive sheet 38 may be fixed so that the elastic deformation of the attachment surface is constrained by the housing 24.

The adhesive sheet 38 attached to the second divided body 32 is attached to the vibration source 42 by attaching the lower adhesive surface 40b, which is the lower surface of the adhesive layer, to the upper surface of the vibration source 42. The housing 24 is attached to the vibration source 42 by attaching each adhesive sheet 38 to the vibration source 42. As a result, the vibration power generation device 10 is supported by the vibration source 42. The vibration source 42 is not particularly limited, and may be any one that causes vibration during use, such as industrial equipment, automobiles, and home appliances.

The housing 24 and the vibration power generation unit 12 housed in the housing 24 are elastically supported by the vibration source 42 via the adhesive sheet 38. As a result, the amplification resonance system 44 is composed of the mass composed of the housing 24 and the vibration power generation unit 12 and the spring composed of the adhesive sheet 38. As a result, the vibration power generation device 10 has a structure in which two resonance systems, an amplification resonance system 44 and a power generation unit resonance system 20, are provided in series, as shown in the model in FIG. In FIG. 3, the spring constant of the adhesive sheet 38 is k1, the damping of the adhesive sheet 38 is c1, the mass of the housing 24 is m1, the spring constant of the leaf spring 16 to which the power generation element 22 is attached is k2, and the power generation element 22. It is described that the damping of the leaf spring 16 to which is bonded is c2, and the mass of the mass members 18 and 18 is m2. The resonance frequency of the amplification resonance system 44 is substantially the same as the frequency of the main vibration in the vertical direction of the vibration source 42, and the resonance frequency of the power generation unit resonance system 20 and the resonance frequency of the amplification resonance system 44 are substantially the same. ing.

A viscoelastic body that elastically connects the housing 24 and the vibration source 42 is composed of an adhesive sheet 38, and the adhesive sheet 38 is attached to the vibration source 42 by the adhesive force of the adhesive surface 40b. As described above, the mounting portion forming the mounting mechanism for the vibration source 42 is composed of the adhesive surface 40b of the adhesive sheet 38, and the viscoelastic body includes the mounting portion. Therefore, a metal fitting or the like for attaching the viscoelastic body to the vibration source 42 becomes unnecessary, and the adhesive sheet 38 which is a viscoelastic body can be directly attached to the vibration source 42.

In the pressure-sensitive adhesive sheet 38, the pressure-sensitive adhesive layer is adhered to the vibration source 42 (pressure-sensitive adhesion), so that the pressure-sensitive adhesive surface 40b, which is the surface of the pressure-sensitive adhesive layer, is allowed to be elastically deformed while being attached to the vibration source 42. ing. Therefore, when the vibration is input from the vibration source 42, the stress due to the elastic deformation of the adhesive surface 40b of the adhesive sheet 38 is dispersed. As a result, the durability of the pressure-sensitive adhesive sheet 38 is improved, and the characteristics of the spring of the amplification resonance system 44 composed of the pressure-sensitive adhesive sheet 38 are stabilized.

Moreover, the pressure-sensitive adhesive sheet 38 is not accompanied by a curing reaction over time when used, such as an adhesive, and is used in a state in which the reaction is almost completed in advance. Therefore, from the beginning when the vibration power generation device 10 is attached to the vibration source 42, the desired fixing force can be stably exhibited, and the power generation performance desired by the vibration power generation device 10 can be exhibited. In this case, it is possible to promptly confirm and measure the power generation performance after installation.

Further, since the adhesive sheet 38 adheres to the vibration source 42 and the housing 24 by adhesive, the adhesive itself has viscosity or elasticity along the surface of the vibration source 42 and the like. A relatively small displacement in the displacement direction is easily allowed as compared with the adhesive structure by the cured adhesive. Therefore, regarding the characteristics of the viscoelasticity of the adhesive sheet 38 and thus the characteristics of the vibration power generation device 10, the influence of the properties of the fixed surface of the vibration source 42, which is the object to be mounted, is reduced, and stable power generation performance, mounting strength, or durability is reduced. It becomes possible to obtain sex.

The vibration power generation device 10 attached to the vibration source 42 is adapted to generate electric power in the vibration power generation unit 12 in response to the vertical vibration input from the vibration source 42. That is, when the main vibration in the vertical direction is input to the vibration power generation device 10 from the vibration source 42, first, mass-spring resonance occurs in the amplification resonance system 44, and the vibration of the housing 24 is amplified. As a result, vibration with a larger amplitude amplified than the vibration amplitude of the vibration source 42 is input from the housing 24 to the vibration power generation unit 12.

Further, mass-spring resonance occurs in the power generation unit resonance system 20 of the vibration power generation unit 12, and the vibration of the mass member 18 is amplified. As a result, the amount of bending deformation of the leaf spring 16 becomes large, and the power generation element 22 fixed to the leaf spring 16 causes a larger strain, so that a larger electric power is generated in the power generation element 22.

In this way, in the vibration power generation device 10, the vibration energy of the vibration source 42 is amplified by the resonance of the two resonance systems 20 and 44, so that the electric energy converted from the vibration energy can be efficiently obtained. ..

The base material of the adhesive sheet 38 is a sheet-like foam. As a result, expansion and contraction deformation of the adhesive sheet 38 in the thickness direction is easily allowed, and the elasticity of the adhesive sheet 38 in the thickness direction is adjusted. The base material of the pressure-sensitive adhesive sheet 38 may be a foam of open cells or a foam of closed cells. In the case of open cells, the elasticity is adjusted by softening the substrate. In the case of closed cells, the elasticity is adjusted by the air springs of the cells.

As shown in FIG. 3, since the adhesive sheet 38 constituting the spring of the amplification resonance system 44 has viscosity (attenuation), the resonance frequency of the amplification resonance system 44 and the vibration in the frequency band before and after it are amplified. It is effectively amplified by the resonance system 44. In this way, the resonance frequency of the amplified resonance system 44 is broadened. For example, even if the frequency of the input vibration changes or the resonance frequency of the amplified resonance system 44 changes due to a temperature change, the power generation efficiency is increased. It is possible to obtain the desired amount of power generation by preventing a significant decrease.

The adhesive sheet 38 constituting the spring of the amplification resonance system 44 has adhesive surfaces 40a and 40b on both the upper and lower surfaces. Then, the upper adhesive surface 40a of the adhesive sheet 38 is adhered to the lower surface 36 of the housing 24, and the lower adhesive surface 40b of the adhesive sheet 38 is adhered to the upper surface of the vibration source 42, so that the housing 24 vibrates. Attached to source 42. By forming the spring of the amplification resonance system 44 as the adhesive sheet 38 in this way, the mounting structure of the vibration power generation device 10 to the vibration source 42 can be simplified. In short, the adhesive sheet 38, which is the spring of the amplification resonance system 44, can be directly attached to the vibration source 42, and it is not necessary to provide a metal fitting or the like for attachment between the vibration source 42 and the spring of the amplification resonance system 44.

According to the attachment of the vibration power generation device 10 to the vibration source 42 by the adhesive sheet 38, it is not necessary to provide the vibration source 42 with a special structure for attaching the vibration power generation device 10. As a result, the mounting position of the vibration power generation device 10 on the vibration source 42 can be set with a large degree of freedom. Further, the mounting position of the vibration power generation device 10 on the vibration source 42 can be adjusted at the mounting site.

Four adhesive sheets 38, which are independent of each other, are provided at the four corners of the housing 24. As a result, the housing 24 is stably supported at the four corners, and when the vibration is input in the vertical direction, the housing 24 is less likely to undergo a prying displacement or the like, and the housing 24 vibrates in the vertical direction. As a result, the power generation efficiency is improved in the vibration power generation unit 12 that generates power by the vibration input in the vertical direction.

Further, the housing 24 is partially supported by the plurality of independent adhesive sheets 38, which makes it easy to adjust the spring characteristics of the adhesive sheet 38. That is, since it is easy to adjust the support area of each adhesive sheet 38, the spring constant of each adhesive sheet 38, and by extension, the characteristics of the spring of the amplification resonance system 44 composed of all the adhesive sheets 38 can be easily described. Can be adjusted to.

It has also been confirmed by experiments that the vibration power generation device 10 having a structure according to the present embodiment effectively amplifies the vibration energy and enables efficient power generation. That is, with respect to an example using the vibration power generation device 10 having a structure according to the present embodiment and a comparative example in which the housing 24 and the vibration source 42 are connected by an adhesive film having no elasticity instead of the adhesive sheet 38, the frequency of the generated power. The result of measuring the characteristics is shown in FIG.

FIG. 4 is a graph of measurement results obtained by inputting sine wave vibration in the frequency band of 80 Hz to 120 Hz with a frequency change of 1 oct / min and measuring the generated power. According to FIG. 4, in the embodiment shown by the solid line, the generated power is larger than that in the comparative example shown by the broken line. In particular, it was confirmed from the experimental results that a larger generated power can be obtained for a vibration input of about 104 Hz, which is the resonance frequency of each of the resonance systems 20 and 44 of the vibration power generation device 10.

In the above experiment, the following adhesive sheet 38 was adopted. That is, a colorless and transparent urethane resin solution having a solid content of 50%, a viscosity of 4000 cps, a number average molecular weight of 20000, and a weight average molecular weight of 80,000 mixed with a curing agent and an oxidizing agent is stirred and mixed to form a pressure-sensitive adhesive. A coating solution is produced. This pressure-sensitive adhesive composition coating liquid is arranged on both sides of a foam sheet as a base material formed of a urethane foam or the like, and the pressure-sensitive adhesive composition coating liquid forms a pressure-sensitive adhesive layer on both sides. An adhesive sheet 38 having adhesive surfaces 40a and 40b is formed.

FIG. 5 shows a vibration power generation device 50 as a second embodiment of the present invention. In the vibration power generation device 50, a permanent magnet 52 as an urging means is arranged between the housing 24 and the adhesive sheet 38. In the following description, the members and parts substantially the same as those in the first embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

The permanent magnet 52 has a rectangular plate shape substantially corresponding to the adhesive sheet 38, and is magnetized in the vertical direction, which is the thickness direction. In the present embodiment, the second split body 32 of the housing 24 and the vibration source 42 are both ferromagnets.

Then, the permanent magnet 52 is magnetically attached to the lower surface 36 of the second divided body 32. Further, the adhesive surface 40a on the upper side of the adhesive sheet 38 is attached to the lower surface of the permanent magnet 52, and the adhesive surface 40b on the lower side of the adhesive sheet 38 is attached to the vibration source 42. As a result, the housing 24 is attached to the vibration source 42 via the adhesive sheet 38 and the permanent magnet 52. Since the permanent magnet 52 is provided on the housing 24 side of the adhesive sheet 38, it constitutes a part of the mass of the amplification resonance system 44.

An attractive force due to magnetic force acts between the permanent magnet 52 and the vibration source 42, and the adhesive sheet 38 is pressed against the permanent magnet 52 and the vibration source 42. As a result, the adhesive force acting between the adhesive sheet 38, the permanent magnet 52, and the vibration source 42 is enhanced, and the adhesive sheet 38 realizes strong attachment of the vibration power generation device 50 to the vibration source 42.

The permanent magnet 52 may be provided at a position separated from the adhesive sheet 38, specifically, at the center of the lower surface 36 of the second divided body 32. According to this, the adhesive sheet 38 is pressed against the vibration source 42 and the second split body 32 by the magnetic attractive force acting between the permanent magnet 52 and the vibration source 42, and the adhesive sheet 38 and the second split body 32 are pressed against each other. The adhesive force acting between the divided body 32 and between the adhesive sheet 38 and the vibration source 42 is enhanced.

Further, the urging force for pressing the adhesive sheet 38 against the vibration source 42 is not limited to the force due to the magnetic force of the permanent magnet 52, and can be obtained, for example, by the elasticity of the metal spring that urges the housing 24 toward the vibration source 42. ..

FIG. 6 shows a vibration power generation device 60 as a third embodiment of the present invention. The viscoelastic body 62 of the vibration power generation device 60 is formed by laminating a plurality of adhesive sheets 38 in the vertical direction. The viscoelastic body 62 of the present embodiment is configured by laminating three adhesive sheets 38, 38, 38, but the number of laminated adhesive sheets 38 constituting the viscoelastic body 62 is particularly limited. is not it. Further, the plurality of laminated pressure-sensitive adhesive sheets 38 are not necessarily limited to the same one, and for example, a plurality of types having different thickness, area, elastic modulus, and the like can be combined.

Then, the upper adhesive surface 40a of the adhesive sheet 38 located at the upper end is attached to the lower surface 36 of the second split body 32, and the lower adhesive surface 40b of the adhesive sheet 38 located at the lower end is attached to the vibration source 42. By being attached, the vibration power generation device 60 is attached to the vibration source 42. In a state where the vibration power generator 60 is attached to the vibration source 42, the four corners of the housing 24 are elastically supported by the vibration source 42 via the vibrating elastic bodies 62, and the plurality of vibrating elastic bodies 62 are amplified and resonant systems 44. Consists of the spring.

According to the vibration power generation device 60 having a structure according to the present embodiment, the resonance frequency of the amplification resonance system 44, the damping characteristics of the viscoelastic body 62, and the like are determined by the number of layers of the adhesive sheets 38 constituting the viscoelastic body 62. Can be easily changed. Therefore, by adjusting the number of layers of the adhesive sheet 38 according to the frequency of vibration input from the vibration source 42, the vibration amplification action by the amplification resonance system 44 can be efficiently obtained.

Further, the resonance frequency and the attenuation performance of the amplification resonance system 44 can be adjusted by changing the type and combination of the adhesive sheet 38. Therefore, the amplification performance of vibration in the amplification resonance system 44 can be adjusted with a large degree of freedom. Further, when the mounting surface of the vibration source 42 is not flat and has unevenness, the number of laminated adhesive sheets 38 can be appropriately adjusted according to the mounting portion of each viscoelastic body 62 to obtain the vibration source 42. While dealing with the unevenness of the mounting surface, it is also possible to secure the mounting strength by the viscoelastic body 62 and to set the vibration direction of the power generation unit resonance system 20.

FIG. 7 shows a vibration power generation device 70 as a fourth embodiment of the present invention. The vibration power generation device 70 has a structure in which the viscoelastic body 72 is fixed to the lower surface 36 of the second divided body 32.

The viscoelastic body 72 is formed of a rubber elastic body or a resin elastomer. The viscoelastic body 72 is provided on each of the opposite side portions of a set of the second divided body 32 having a rectangular plate shape. The viscoelastic body 72 is continuous over the entire length of the opposite side portion. The viscoelastic body 72 is provided with a locking groove 74 as a locking portion that opens inward in the opposite direction of the opposite side portion, and extends with a substantially constant groove-shaped cross section.

Then, both ends of the plate-shaped vibration source 42 are inserted into the locking grooves 74, 74 of the pair of viscoelastic bodies 72, 72. As a result, the viscoelastic body 72 is mechanically locked to the vibration source 42 in the vertical direction, and the vibration power generation device 70 including the viscoelastic bodies 72, 72 is attached to the vibration source 42. In the mounted state of the vibration power generation device 70 to the vibration source 42, the housing 24 is elastically connected to the vibration source 42 via the vibrating elastic bodies 72 and 72. As a result, the amplification resonance system 44 having the mass by the housing 24 and the vibration power generation unit 12 and the spring by the viscoelastic bodies 72 and 72 is configured.

According to the vibration power generation device 70 having a structure according to the present embodiment, the viscoelastic bodies 72 and 72 each having the locking groove 74 are locked with respect to the vibration source 42, thereby causing the vibration power generation device. The 70 is easily attached to the vibration source 42. Further, the vibration power generation device 70 can be easily removed from the vibration source 42.

As described above, the viscoelastic body is not limited to the one attached to the vibration source 42 by adhesiveness, and the viscoelastic body may be attached to the vibration source 42 by mechanical action such as locking.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific description thereof. For example, the number, arrangement, and shape of viscoelastic bodies are not particularly limited. For example, the viscoelastic body may be only one that covers the entire lower surface 36 of the housing 24, or may be provided at the center in addition to the four corners of the lower surface 36 of the housing 24 to improve stability.

Further, the viscoelastic body is not limited to the one in which the pressure-sensitive adhesive layers are provided on both sides of the base material made of the elastic body as described above, and for example, it can be composed of a single layer of the pressure-sensitive adhesive, and a pressure-sensitive adhesive is required. It is also possible to adjust the elasticity and the like by partially foaming according to the above. Furthermore, the viscoelastic body may be provided with a mounting portion for the vibration source 42. For example, for the mounting portion of the viscoelastic body on the housing 24 side, a fixing structure by adhesion or mechanical fixing can be adopted. Is.

It is not essential that the housing 24 as a mass member has a structure in which the first divided body 30 and the second divided body 32 are detachably connected to each other. Further, for example, when the vibration power generation unit 12 may be exposed, the lid 28 is not indispensable. The mass member is not limited to the hollow housing 24 capable of accommodating the vibration power generation unit 12, and is provided, for example, in a state where the vibration power generation unit 12 is exposed on the plate-shaped mass member. Is also good.

The configuration of the vibration power generation unit 12 shown in the above embodiment is an example, and the structure and power generation principle of the vibration power generation unit are not limited. For example, vibration power generation that converts vibration energy into electrical energy can be performed by using an electret element as disclosed in Japanese Patent Application Laid-Open No. 2016-149914. Further, for example, the induced electromotive force generated by electromagnetic induction at the time of vibration input can be taken out as generated power.

The vibration input direction from the vibration source 42 to the vibration power generation unit 12 is not necessarily limited to the direction orthogonal to the mounting surface of the vibration source 42 to which the vibration power generation device 10 is mounted. For example, the vibration power generation unit 12 can generate electricity by inputting vibration in a direction parallel to the mounting surface of the vibration source 42 or in a direction inclined. The support direction of the housing 24 by the vibration source 42 and the housing 24 so that the main vibration direction generated in the power generation unit resonance system 20 or the main displacement direction of the mass member 18 substantially coincides with the main vibration input direction. It is desirable to set the support direction of the power generation unit resonance system 20 so as to be different from the support direction of the power generation unit resonance system 20.

10, 60, 70: Vibration power generation device, 12: Vibration power generation unit, 24: Housing (mass member), 30: First split body, 32: Second split body, 38: Adhesive sheet (viscous elastic body), 40b: Adhesive surface (mounting part), 42: Vibration source, 52: Permanent magnet (biasing means), 62, 72: Viscoelastic body, 74: Locking groove (locking part)

Claims (9)

A vibration power generator that converts the vibration energy input from the vibration source into electrical energy,
A mass member that supports the vibration power generation unit and
It has a viscoelastic body that elastically connects the mass member and the vibration source.
A vibration power generation device in which a mounting portion for attaching the mass member to the vibration source is composed of the viscoelastic body. The vibration power generation device according to claim 1, wherein the attachment portion of the viscoelastic body is elastically deformable in a state of being attached to the vibration source. The vibration power generation device according to claim 1 or 2, wherein the mounting portion of the viscoelastic body includes an adhesive surface that is adhered to the vibration source. The vibration power generation device according to any one of claims 1 to 3, wherein the viscoelastic body has a structure having bubbles. The vibration power generation device according to any one of claims 1 to 4, wherein the viscoelastic body has a plurality of laminated structures. The vibration power generation device according to any one of claims 1 to 5, wherein a plurality of the viscoelastic bodies are provided independently of each other. Any of claims 1 to 6, wherein the mass member has a divided structure in which the first divided body on the vibration power generation unit side and the second divided body on the viscoelastic body side are detachably connected to each other. The vibration power generation device according to paragraph 1. The vibration power generation device according to any one of claims 1 to 7, wherein an urging means for pressing the attachment portion of the viscoelastic body against the vibration source is provided. The vibration power generation device according to any one of claims 1 to 8, wherein the mounting portion of the viscoelastic body has a locking portion that is locked to the vibration source.

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