JP2013158118A - Power generation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation apparatus configured to be installed on a vehicle and generate power by vibrations of the vehicle which efficiently generates power in many frequency bands.SOLUTION: A power generation apparatus 1 includes a case body 3 adapted to be mounted on a vehicle, and a strainer 20 provided with first to fourth power generators (31-34) and a mass body 40 and mounted on the case body 3. In the power generation apparatus 1, the strainer 20 has a joint part 20a mounted with the mass body 40, and a plurality of straining parts (21-24) formed integrally with the joint part 20a, extended outward from the joint part 20a, and mounted at end portions (21a-24a) on the case body 3. The plurality of power generators (31-34) have respective piezoelectric elements (31a-34a), and the plurality of power generators (31-34) are mounted on the plurality of straining parts (21-24), respectively.

Description

  The present invention relates to a power generation device using a piezoelectric element, and more particularly to a power generation device that is attached to a vehicle such as an automobile and generates power by vibration of the vehicle.

For example, a power generation device disclosed in Patent Document 1 has been proposed as a power generation device that can be attached to a vehicle such as an automobile and generate power by vibration of the vehicle. This power generation device includes a beam to which a piezoelectric element is integrally fixed and a weight (mass), and has a structure in which one end of the beam is fixed and a weight is attached to the other end. In this power generation apparatus, the beam undergoes flexural vibration due to the vibration of the vehicle, and the piezoelectric element fixed to the beam generates electric power due to the flexural vibration.

However, the beam to which the piezoelectric element is attached in the power generation apparatus described above performs flexural vibration with large displacement only in the frequency band of the primary mode, and does not perform flexural vibration with large displacement in the other frequency bands. Therefore, this power generation device can generate power efficiently only when vibrations in the primary mode frequency band are formed in the vehicle, and cannot efficiently generate power in other frequency bands.

JP 2005-57982 A

Accordingly, the present invention has been made in view of the above-described circumstances, and provides a power generation apparatus that can efficiently generate power in a large number of frequency bands.

In order to solve the above-described problem, a power generation device described in claim 1 includes a case body attached to a vehicle, and a strain body provided with the power generation body and the mass body and attached to the case body. Prepare. In the power generation device, the strain body includes a joint portion to which the mass body is attached, and is integrally formed with the joint portion and extends outward from the joint portion. And a plurality of the power generation bodies, each of which includes a plurality of piezoelectric elements, and each of the plurality of power generation bodies is attached to each of the plurality of strain generation sections. It is characterized by.

  In the power generation device according to claim 1, an excitation force in a wide frequency band from the vehicle acts on the mass body attached to the coupling portion of the strain generating body. In addition, a plurality of strain generating portions whose ends are attached to the case main body are integrally formed in the joint portion of the strain generating body to which the mass body is attached. Here, since a plurality of strain generating portions are provided as described above, a plurality of frequency bands in which the plurality of strain generating portions vibrate (displace) with a large amplitude can be set. Therefore, the strain generating portion can be displaced with a large amplitude in a large number of frequency bands due to the excitation force in a wide frequency band acting on the mass body. As described above, since the strain generating portion can be displaced with a large amplitude in a large number of frequency bands, the piezoelectric element of the power generator provided in the strain generating portion can efficiently generate power in a large number of frequency bands. it can. That is, the power generator described in claim 1 can efficiently generate power in a number of frequency bands.

  The power generator described in claim 2 is the power generator described in claim 1, wherein the mass body includes a first mass body attached to one side of the coupling portion of the strain body, and a strain body. And a second mass body attached to the other side opposite to the first mass.

  In this way, the mass body is divided into two mass bodies into the first and second mass bodies, and each mass body is arranged above and below with the strain body interposed therebetween. Therefore, the mass body can easily perform the peristaltic motion in the rotation direction around the strain body by the excitation force from the vehicle. Thereby, when the excitation force of the frequency band which perturbs the mass body attached to the strain body in the rotation direction acts on the mass body, the strain section can be displaced with a larger amplitude. Therefore, the strain generating portion can be displaced with a large amplitude in a larger number of frequency bands. Therefore, the power generator described in claim 2 can efficiently generate power in a larger number of frequency bands.

ADVANTAGE OF THE INVENTION According to this invention, the electric power generating apparatus which can generate electric power efficiently in many frequency bands can be provided.

It is a perspective view which shows the external appearance in the electric power generating apparatus of embodiment of this invention. It is a perspective view which shows the internal structure in the electric power generating apparatus of embodiment of this invention. It is a perspective view of a vibrating body in a power generator of an embodiment of the present invention. It is a figure explaining the displacement of the vibrating body in the electric power generating apparatus of embodiment of this invention. It is a figure explaining the displacement of the vibrating body in the electric power generating apparatus of embodiment of this invention.

  Next, a power generator according to a first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. Here, FIG. 1 is a perspective view showing an external appearance of the power generation apparatus according to the embodiment of the present invention, and FIG. 2 is a perspective view showing an internal structure of the power generation apparatus according to the embodiment of the present invention. FIG. 3 is a perspective view of the vibrating body according to the embodiment of the present invention. FIG. 2 shows the power generation device 1 in the state where the first case body 2 is removed from the power generation device 1 whose appearance is shown in FIG.

  As shown in FIG. 1 and FIG. 2, the power generation apparatus 1 includes a first and second case bodies (2, 3) that can be attached to a vehicle such as an automobile, and a case body (2, 3). And a control device 60 attached to the second case body 3.

  Next, the vibrating body 10 provided in the power generation device 1 will be described with reference to FIGS. 2 and 3. The case body 2 is provided with a cover body 2a at the center of the upper surface, and the amplitude value of the vibration in the vertical direction of the vibration body 10 is adjusted by the installation position of the cover body 2a.

  As shown in FIG. 2 and FIG. 3, the vibrating body 10 is provided on the strain body 20, the strain body 20 formed of an elastic plate material, the mass body 40 provided on the strain body 20, and the strain body 20. First to fourth power generation bodies (31 to 34).

The strain body 20 includes a joint portion 20a having a through hole 20d formed substantially at the center, and first to fourth beam-like strain portions radially extending in four directions from the joint portion 20a toward the outside. (21-24). The strain generating body 20 is formed of a thin plate material, and the first to fourth strain generating portions (21 to 24) and the joint portion 20a are integrally formed. The end portions (21a to 24a) of the first to fourth strain generating portions (21 to 24) are interposed through first to fourth holding members (51 to 54) formed of an elastic member such as rubber. And attached to the case body (2, 3). As described above, the strain body 20 is attached to the case body (2, 3) via the elastic holding members (51 to 54), so that the case body (2, 3) is vibrated by strong vibration. Even if it is damaged, it is prevented from being damaged.

  Each of the first to fourth power generation bodies (31 to 34) is integrally fixed to a thin plate-like piezoelectric element (31a to 34a) and one side surface of these piezoelectric elements (31a to 34a). And thin electrode plates (31b to 34b). The first to fourth power generation bodies (31 to 34) are respectively provided with the first to fourth strain generating portions (21 to 24) of the strain generating body 20 via sheet-like insulators (B1 to B4). ).

  The mass body 40 includes a linkage member 43 inserted and fixed in the through hole 20d of the coupling portion 20a of the strain body 20, and first and second mass bodies (41, 41) attached to both ends of the linkage member 43, respectively. 42). Here, the first mass body 41 is disposed on one side 20b of the coupling portion 20a and attached via the linkage member 43, and the second mass body 42 has the first mass sandwiching the strain body 20 therebetween. It is disposed on the other side 20 c opposite to the body 41 and attached via a linkage member 43. In the present embodiment, the mass difference between the first and second mass bodies (41, 42) is set so that the mass body 40 can easily rotate. Note that the mass difference need not be set in the first and second mass bodies (41, 42).

  In the power generation device 1 of the present embodiment, the vibrating body 10 to which the mass body 40 is attached by the excitation force from the case body (2, 3) vibrates in various frequency bands. The strain generating body 20 and the power generation bodies (31 to 34) integrally attached to the strain generation body 20 are displaced by this vibration, and the piezoelectric elements included in the power generation bodies (31 to 34) are displaced by this displacement. The elements (31a to 34a) generate power. Here, the piezoelectric elements (31a to 34a) and the electrode plates (31b to 34b) of the power generation bodies (31 to 34) are electrically connected to the control device 60, and the piezoelectric elements (31a to 34a) are electrically connected to the control device 60. ) Is adjusted by the control device 60 and output to the outside.

  Next, a typical form (vibration mode) of vibration of the vibrating body 10 in the power generation apparatus 1 will be described based on FIGS. 4 and 5.

  FIG. 5 shows a form of vibration of the vibrating body 10 in a frequency band in which the mass body 40 is displaced in the vertical direction (indicated by a large arrow in FIG. 5). As shown in FIG. 5, when the mass body 40 vibrates in the vertical direction, the strain-generating portions (21 to 24) of the strain-generating body 20 are end portions (21a to 21a) fixed to the case body (2, 3). The “first-order mode” vibration of the cantilever beam with 24a) as “node” is shown (indicated by a small arrow in FIG. 5). And in this frequency band, when each piezoelectric element (31a-34a) performs the above vibrations, predetermined power generation is performed in each piezoelectric element (31a-34a).

  Further, FIG. 6 shows the form of vibration of the vibrating body 10 in the frequency band (frequency band different from the vibration mode shown in FIG. 5) in which the mass body 40 is displaced in the rotation direction (indicated by a large arrow in FIG. 6). It is shown. As shown in FIG. 6, when the mass body 40 vibrates in the rotation direction, in the strain body 20, for example, the second and fourth strain portions (22, 24) are formed on the case body (2, 3). The “second order mode” vibration of the cantilever with the fixed ends (22a, 24a) as “nodes” is performed (indicated by small arrows in FIG. 6). Then, in this frequency band, for example, the second and fourth piezoelectric elements (32a, 34a) perform the vibration as described above, so that the second and fourth piezoelectric elements (32a, 34a) have predetermined vibrations. Electricity is generated.

Thus, as shown in FIGS. 5 and 6, the vibrating body 10 of the power generation device 1 of the present embodiment is
It is possible to vibrate with a large amplitude in various frequency bands. Therefore, the power generator 1 can generate power efficiently in a large number of frequency bands.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1,100 Power generator 2,3 1st and 1st case body 10 Vibrating body 20 Strain body 20a Joining part 20b One side 20c The other side 20d Through-holes 21-24 The 1st-4th strain part 21a- 24a End portions 31 to 34 First to fourth power generation bodies 31a to 34a Piezoelectric elements 31b to 34b Electrode plates B1 to B4 Insulator 40 Mass body 41 First mass body 42 Second mass body 43 Linking members 51 to 54 1st to 4th holding member 60 Control device B1-B4 insulator

Claims (2)

In a power generator comprising: a case body attached to a vehicle; a power generator and a mass body provided with a strain body attached to the case body;
The strain body includes a joint portion to which the mass body is attached, and a plurality of joints formed integrally with the joint portion and extending outward from the joint portion, and having end portions attached to the case body. Having a distortion part,
A plurality of the power generation bodies are provided, each including a piezoelectric element, and each of the plurality of power generation bodies is attached to each of the plurality of strain generating portions. In the electric power generating apparatus described in Claim 1,
The mass body includes a first mass body attached to one side of the coupling portion of the strain generating body, and a second mass attached to the other side opposite to the first mass across the strain body. A power generator.

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