JP2005002960A - Power generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generation device capable of effectively performing power generation even when being applied with external force such as vibration having a component in either of two orthogonal directions. <P>SOLUTION: The power generation device 1 comprises a piezoelectric element 9, an impact applicator 8 striking the piezoelectric element 9 and making the element perform power generation, and a drive mechanism 2 for driving the impact applying body 8. The drive mechanism 2 has a first weight 3 rotatable about a first axis L<SB>1</SB>by the external force, a second weight 4 rotatable about a second axis L<SB>2</SB>orthogonal to the first direction L<SB>1</SB>, and a power transmission mechanism 2 transmitting rotary motion of the two weights 3, 4 to the impact applicator 8. This allows power generation even when such external force as rotating only one of the two weights 3, 4 is applied. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power generation device using a piezoelectric element.
[0002]
[Prior art]
As a power generation device that generates power using external force such as vibration, for example, a pinion in the case is meshed with a vertically extending rack, and the vertical movement of the case due to external vibration is converted into rotational energy by a gear train. However, a device that gives an impact to the piezoelectric element with this rotational energy has been devised (see, for example, Patent Document 1).
[0003]
In addition, in the power generation device disclosed herein, a coil spring that holds the case in a neutral position in the vertical direction is used so that power generation is performed even when the case vibrates in any direction.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-164865 (page 3 to page 4, FIGS. 1 to 5)
[0005]
[Problems to be solved by the invention]
However, a power generation device using external force such as vibration has conventionally had a problem that there are many application restrictions and power generation efficiency is low because only a certain direction of vibration such as vertical movement can be used. For example, in the power generation apparatus described in Patent Document 1, a case and a rack are included, although a moving component such as an automobile and an artificial external force include a horizontal component in addition to a vertical component. Since power generation is performed using only the differential in the vertical direction, there are many application restrictions and power generation efficiency is low.
[0006]
In view of the above problems, an object of the present invention is to provide a power generator that can efficiently generate power even when an external force such as vibration having components in two orthogonal directions is applied. .
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, in the power generation device of the present invention, a power generation device including a piezoelectric element, an impact applying body that strikes the piezoelectric element to generate electric power, and a drive mechanism that drives the impact applying body. The drive mechanism includes: a first weight body that can rotate around a first axis by an external force; and a second weight body that can rotate around a second axis extending in a direction intersecting the first axis. And a power transmission mechanism for transmitting the rotational motion of the first weight body and the rotational motion of the second weight body to the impact imparting body.
[0008]
In the present invention, there are two weight bodies that can rotate around an axis extending in a direction intersecting each other, and the rotational motion of any of these weight bodies is transmitted to the impact imparting body to generate power. For this reason, power can be generated even when an external force that only rotates one of the two weights is applied, and when an external force that rotates both of the two weights is applied, both rotations are combined. Then, it is transmitted to the impact imparting body to generate power. Therefore, even when an external force such as vibration having any component in two orthogonal directions is applied, power can be generated efficiently and can be used for various applications.
[0009]
In the present invention, the power transmission mechanism transmits the rotational motion of the first weight body to the common output member, and the rotational motion of the second weight body to the common output member. A first transmission mechanism that transmits only the rotational movement that drives the common output member in one direction out of the two-way rotation of the first weight body; A first clutch mechanism that interrupts transmission of rotational movement in a direction, and the second transmission mechanism drives the common output member in the one direction during bidirectional rotation of the second weight body. It is preferable to include a second clutch mechanism that transmits only rotational motion and blocks transmission of rotational motion in the reverse direction. With this configuration, the common output member is driven only in one direction even when the weight body is in a rotational motion or swings so as to reciprocate within a predetermined angular range. Therefore, since the impact imparting body does not reverse during movement to strike the piezoelectric element, it is possible to perform efficient power generation with a simple configuration.
[0010]
In the present invention, the first clutch mechanism interrupts transmission of the common output member from the common output member to the first weight body with respect to the movement in the one direction, and the second clutch mechanism As for the movement of the common output member in the one direction, it is preferable to block transmission from the common output member to the second weight body. In such a configuration, even when only one of the two weights rotates or when there is a difference in the rotation speed of the two weights, the movement of the common output member is stopped. Since it is not transmitted to the weight body or the weight body rotating at a low speed, it is not attenuated and high power generation efficiency can be obtained.
[0011]
In the present invention, the second axis is defined by a rotation shaft supported so as to be rotatable with respect to the first weight body in a direction orthogonal to the first axis line, and the second weight body Is preferably configured to be rotatable integrally with the rotating shaft. If comprised in this way, since a 1st weight body and a 2nd weight body can be comprised as one unit, size reduction of a drive mechanism can be achieved.
[0012]
In the present invention, the second transmission mechanism includes a power transmission shaft disposed coaxially with the first axis, and a rotation direction conversion mechanism that transmits rotation of the rotation shaft to the power transmission shaft. Accordingly, the rotational movement of the second weight body can be transmitted to the power transmission shaft, and the first weight body is rotatably supported by the power transmission shaft, and the first transmission mechanism Is provided with a power transmission body that can rotate integrally with the first weight body, and the power transmission body is preferably arranged coaxially with the power transmission shaft. If comprised in this way, both the rotational motion of a 1st weight body and a 2nd weight body can be transmitted as a rotational motion around a common axis line (1st axis line). Therefore, the power transmission mechanism can be arranged in a narrow space.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An example of a power generator to which the present invention is applied will be described with reference to the drawings.
[0014]
(overall structure)
1 and 2 are a schematic perspective view and an exploded perspective view of a power generator according to the present invention. In the drawing, when two orthogonal axes are defined as a first axis and a second axis, clockwise rotation about the first axis or an axis parallel to the first axis toward the drawing is indicated by an arrow CW _1. indicated, are shown rotating counterclockwise in the arrow CCW _1. Further, the clockwise rotation centered on the axis parallel to the second axis or it indicated by the arrow CW _2, there is shown a counterclockwise rotation by the arrow CCW _2.
[0015]
As shown in FIGS. 1 and 2, the power generation apparatus 1 of this embodiment includes a piezoelectric element 9, an impact applying body 8 that strikes the piezoelectric element 9 to generate electric power, and a drive mechanism 2 that drives the impact applying body 8. And have.
[0016]
The drive mechanism 2 includes a first weight body 3 that can be rotated about the first axis L ₁ by an external force, and a second weight that can be rotated about the second axis L ₂ orthogonal to the _first axis L _1. the body 4, the rotational movement of the first weight body 3, and the rotational movement of the second weight body 4 to the first common output gear 20 is disposed coaxially with the axis L ₁ (common output member) And a power transmission mechanism 5 for transmitting.
[0017]
The first weight body 3 includes an annular portion 31 and an arc portion 32 that spans the annular portion 31, and the weight portion 33 projects from the center of the arc portion 32 to the lower side. . The first weight body 3 is rotatably supported with respect to a power transmission shaft 77 of a second transmission mechanism 7 to be described later. By the power transmission shaft 77, the rotation center axis line of the first weight body 3 (first 1 axis L ₁ ) is defined.
[0018]
The second weight body 4 is formed in an arc shape, and a central portion thereof is a weight portion 41. The second weight body 4 can rotate integrally with a rotation shaft 40 that is rotatably supported with respect to the first weight body 3, and the rotation center axis of the second weight body 4 is rotated by the rotation shaft 40. (Second axis L ₂ ) is defined. Here, the power transmission shaft 77 as the rotation center axis of the first weight body 3 and the rotation shaft 40 as the rotation center axis of the second weight body 4 are arranged to be orthogonal to each other.
[0019]
In this embodiment, the power transmission mechanism 5 transmits the rotational motion of the first weight body 3 to the common output gear 20 in order to transmit the rotational motion of the first weight body 3 and the second weight body 4 to the common output gear 20. 20 includes a first transmission mechanism 6 that transmits to the second transmission mechanism 20 and a second transmission mechanism 7 that transmits the rotational motion of the second weight body 4 to the common output gear 20.
[0020]
First, the first transmission mechanism 6 includes a connection gear 67 that can rotate about the first axis L ₁ integrally with the first weight body 3, and the connection gear 67 is coaxial with the power transmission shaft 77. Arranged in a shape. The first transmission mechanism 6 has a first clutch mechanism 60 which is disposed along the first axis L ₁ on the side of the connecting gear 67, the first clutch mechanism 60 is The first gear 61 that meshes with the coupling gear 67 and the second gear 62 that meshes with the common output gear 20 are provided, and the one-way clutch 63 is provided between the first gear 61 and the second gear 62. ing.
[0021]
In the first clutch mechanism 60, as will be described later with reference to FIG. 3, the one-way clutch 63 is the common output gear 20 in the bidirectional rotation around the _first axis L1 of the first weight body 3. Is transmitted only in one direction (counterclockwise CCW ₁ direction), and transmission of rotational motion in the reverse direction is interrupted. That is, the one-way clutch 63 is engaged gear 67 first weight member 3 is rotated counterclockwise CCW ₁ also rotates counterclockwise CCW _1, as a result, the first gear 61 in the clockwise CW ₁ When rotated, the rotation is transmitted to the second gear 62 to rotate the common output gear 20 counterclockwise CCW ₁ , but the first weight body 3 rotates clockwise CW ₁ and the connecting gear 67 is also rotated. When the first gear 61 rotates counterclockwise CCW ₁ as a result of rotating clockwise CW ₁ , the rotation is not transmitted to the second gear 62, so the common output gear 20 rotates clockwise CW ₁ . It does not rotate.
[0022]
In the first clutch mechanism 60, the one-way clutch 63 transmits the common output gear 20 from the common output gear 20 to the first weight body 3 in one direction (counterclockwise CCW ₁ rotation). Cut off.
[0023]
The second transmission mechanism 7 includes a power transmission shaft 77, a rotation direction conversion mechanism 76 that transmits the rotational motion of the rotary shaft 40 to the power transmission shaft 77, a gear 78 that is coaxially attached to the power transmission shaft 77, A common output gear 20 and a gear 79 configured to be rotatable together are provided. The rotation direction conversion mechanism 76 includes a first bevel gear 74 attached to the rotary shaft 40 and a second bevel gear 75 attached to the power transmission shaft 77 so as to mesh with the first bevel gear 74. Has been.
[0024]
The second transmission mechanism 7 has a second clutch mechanism 70 on the side opposite to the first clutch mechanism 60, and the second clutch mechanism 70 is a gear attached to the power transmission shaft 77. 78, and a second gear 72 that meshes with a gear 79 that is integrally formed with the common output gear 20, and a one-way between the first gear 71 and the second gear 72. A clutch 73 is provided.
[0025]
In the second clutch mechanism 70, as will be described later with reference to FIG. 4, the one-way clutch 73 is the common output gear 20 in the two-way rotation around the _second axis L2 of the second weight body 4. Is transmitted only in one direction (counterclockwise CCW ₁ direction), and transmission of rotational motion in the reverse direction is interrupted. That is, in the one-way clutch 73, the second weight body 4 rotates clockwise CW ₂ and the power transmission shaft 77 and the gear 78 rotate counterclockwise CCW _1. As a result, the first gear 71 rotates clockwise. When rotated to CW ₁ , the rotation is transmitted to the second gear 72 to rotate the common output gear 20 counterclockwise CCW ₁ , but the second weight 4 rotates counterclockwise CCW _2. When the power transmission shaft 77 and the gear 78 rotate clockwise CW ₁ and, as a result, when the first gear 71 rotates counterclockwise CCW ₁ , the rotation is not transmitted to the second gear 72. output gear 20 does not rotate in the clockwise CW _1.
[0026]
Further, in the second clutch mechanism 70, the one-way clutch 73 transmits transmission from the common output gear 20 to the second weight body 4 with respect to the movement of the common output gear 20 in one direction (counterclockwise CCW ₁ rotation). Cut off.
[0027]
Further, in this embodiment, the impact applying body 8 is coaxially connected to the common output gear 20 via the connecting rotation shaft 85. Here, the impact imparting body 8 includes, for example, a disk-shaped rotating member 81, two connecting rods 82 made of an elastic material extending radially outward from the opposed positions of the outer peripheral surface of the rotating member 81, and And a spherical impactor 83 attached to each of the tip portions of the two connecting rods 82. The piezoelectric element 9, as the striking surface 91 slightly inside position of the rotation trajectory of the impactor 83 when the impact application member 8 is rotated to the first axis L ₁ around is positioned, the impact imparting body 8 Two pieces are arranged facing each other so as to be sandwiched.
[0028]
(Power generation operation)
FIGS. 3 and 4 are explanatory diagrams showing how the rotary motion is transmitted to the impact applying body 8 when the first weight body 3 is rotated by an external force in the power generation apparatus 1 shown in FIG. It is explanatory drawing which shows a mode that the rotational motion is transmitted to the impact imparting body 8, when the weight body 4 of this is rotated by external force.
[0029]
In the power generation device 1 of the present embodiment, in the standby state, the first weight body 3 and the second weight body 4 are both in a state where they hang vertically due to their own weight.
[0030]
In this state, for example, an external force is applied to the power generation apparatus 1, and the first weight 3 is centered about the _first axis L ₁ (around the power transmission shaft 77) as shown in FIG. 3 by the external force. When rotating counterclockwise CCW ₁ , the first transmission mechanism 6 of the power transmission mechanism 5
Counterclockwise CCW ₁ rotation of the connecting gear 67 Rotation of the first gear 61 clockwise CW ₁ Rotation of the second gear 62 Clockwise CW ₁ of the rotation Common output gear 20 Counterclockwise CCW ₁ of rotation impact imparting body 8 counterclockwise CCW ₁ is rotated, and the piezoelectric element 9 is struck by the impactor 83 of the impact imparting body 8 to generate power.
[0031]
On the other hand, when the first weight body 3 rotates clockwise CW ₁ by an external force, the first transmission mechanism 6 of the power transmission mechanism 5
Rotation of the connecting gear 67 clockwise CW ₁ Rotation of the first gear 61 of the first clutch mechanism 60 counterclockwise CCW ₁ occurs, but rotation of the first gear 61 counterclockwise CCW ₁ is one-way. It is disconnected by the clutch 63 and is not transmitted to the common output gear 20 and the impact applying body 8.
[0032]
On the other hand, as shown in FIG. 4, when the second weight body 4 is rotated clockwise CW ₂ around the second axis L ₂ (around the rotation axis 40) by an external force, the second transmission of the power transmission mechanism 5 is performed. In mechanism 7,
Rotating shaft 40 rotating clockwise CW ₂ Rotating first bevel gear 74 rotating clockwise CW ₂ Rotating second bevel gear 75 Counterclockwise CCW ₁ Rotating power transmission shaft 77 Counterclockwise CCW ₁ rotating gear 78 counterclockwise CCW ₁ rotation first gear 71 clockwise CW ₁ rotation second gear 72 clockwise CW ₁ rotation common output gear 20 counterclockwise CCW ₁ rotation impact imparting body 8 Counterclockwise CCW ₁ is rotated, and the piezoelectric element 9 is struck by the impactor 83 of the impact imparting body 8 to generate power.
[0033]
On the other hand, when the second weight body 4 rotates counterclockwise CCW ₂ by an external force, the second transmission mechanism 7 of the power transmission mechanism 5
Rotation shaft 40 clockwise CCW ₂ counter-rotation first bevel gear 74 counter-clockwise CCW ₂ rotation second bevel gear 75 clockwise CW ₁ rotation power transmission shaft 77 clockwise CW ₁ rotation gear Although counterclockwise rotation CCW ₁ of the first gear 71 of the 78 rotating the second clutch mechanism 70 clockwise CW ₁ occurs, counterclockwise rotation CCW ₁ of the first gear 71, one-way clutch 73 And is not transmitted to the common output gear 20 and the impact applying body 8.
[0034]
Therefore, power generation is performed when the first weight body 3 rotates counterclockwise CCW ₁ by an external force. Further, power generation is also performed when the second weight body 4 is rotated clockwise CW ₂ by an external force. Further, when the first weight 3 is rotated counterclockwise CCW ₁ by the external force and the second weight 4 is rotated clockwise CW ₂ , both rotations are combined to generate the common output gear 20. It rotates counterclockwise CCW ₁ to generate electricity. Furthermore, when the first weight body 3 repeats the counterclockwise CCW ₁ rotation and the clockwise CW ₁ rotation by an external force, a period during which the first weight body 3 rotates counterclockwise CCW ₁ ; While power generation is performed and the first weight 3 rotates clockwise CW ₁ , the inertial force of the power transmission unit 5 continues to be generated, but then stops. Similarly, when the second weight 4 repeats clockwise CW ₂ rotation and counterclockwise CCW ₂ rotation due to external force, power generation is performed during the period in which the second weight 4 rotates clockwise CW _2. The inertial force of the power transmission unit 5 continues to be generated during the period in which the second weight body 4 rotates counterclockwise CCW ₂ , but stops thereafter.
[0035]
The electric power generated when the impactor 83 of the impact imparting body 8 strikes the piezoelectric element 9 is supplied to a control board (not shown) via an output terminal (not shown). After the adjustment is performed, the power is output to an external device (not shown) arranged outside the power generation device 11.
[0036]
Here, the one-way clutch 63 of the first clutch mechanism 60 blocks transmission of the common output gear 20 from the common output gear 20 to the first weight body 3 with respect to the counterclockwise rotation CCW ₁ . Further, in the second clutch mechanism 70, the one-way clutch 73 blocks transmission from the common output gear 20 to the second weight body 4 with respect to the counterclockwise rotation CCW ₁ of the common output gear 20. Therefore, when only one of the first weight body 3 and the second weight body 4 is rotated and the other is not rotated, both the first weight body 3 and the second weight body 4 are used. However, even when the rotational speeds are different, the rotation of the common output gear 20 is not attenuated by the stopped weight body or the weight body rotating at a low speed. Incidentally, as described above, the common output gear 20 because there is no rotating clockwise CW _1, it is sufficient only in one-way clutch.
[0037]
For example, when the first weight 3 rotates to rotate the common output gear 20 counterclockwise CCW ₁ , the rotation causes the second gear 72 of the second clutch mechanism 70 to rotate clockwise CW _1. However, since the rotation of the second gear 72 in the clockwise direction CW ₁ is interrupted by the one-way clutch 72, the rotation energy of the common output gear 20 causes the second weight body 4 to rotate. Is not consumed.
[0038]
(Effect of this embodiment)
As described above, the power generation device 1 of the present embodiment includes the first and second weight bodies 3 and 4 that are rotatable around the first and second axes L ₁ and L ₂ that are orthogonal to each other. Any of the rotational motions of the weights 3 and 4 is transmitted to the impact applying body 8 through the power transmission mechanism 2 and the common output gear 20 to generate power. Therefore, power can be generated even when an external force is applied such that only one of the two weights 3 and 4 rotates, and when an external force such that both of the two weights 3 and 4 are applied is applied. The two rotations are combined and transmitted to the impact applying body 8 to generate electricity. Therefore, even when an external force such as vibration having any component in two orthogonal directions is applied, power can be generated efficiently. Therefore, it is not necessary to strictly define the installation posture of the power generator 1 with respect to the direction in which an external force such as vibration is generated. Moreover, since the electric power generating apparatus 1 of this form has high electric power generation efficiency, it can be used for various uses. For example, if the power generator 1 of this embodiment is mounted on various mobile objects, it can be used as a power source. In addition, when the power generation device 1 of the present embodiment is used in a monitoring system, the occurrence of an abnormality can be detected when the power generation device 1 starts power generation by applying some abnormality as an external force. 1 can be used as a transmission device having no power source.
[0039]
Further, in this embodiment, the power transmission mechanism 2 transmits only the rotational motion that drives the common output gear 20 counterclockwise CCW ₁ out of the bidirectional rotation of the weights 3 and 4, and the rotational motion in the reverse direction. Since the clutch mechanisms 60 and 70 are cut off, the common output member 20 can be used even when the weights 3 and 4 oscillate so as to reciprocate within a predetermined angular range. Is driven counterclockwise CCW ₁ only. Therefore, since the impact imparting body 8 is not reversed during rotation for striking the piezoelectric element 9, it is possible to perform efficient power generation with a simple configuration.
[0040]
Moreover, the one-way clutches 63 and 73 of the first and second clutch mechanisms 60 and 70 block the transmission of the common output gear 20 from the common output gear 20 to the weights 3 and 4 with respect to the counterclockwise CCW ₁ rotation. To do. Therefore, when only one of the two weight bodies 3 and 4 is rotated and the other is not rotating, and even when both the weight bodies 3 and 4 are rotating but the rotational speeds are different, The rotation of the common output gear 20 is not attenuated by the stopped weight body or the weight body rotating at a low speed.
[0041]
Further, in the present embodiment, the second axis L ₂ is defined by the rotation axis 40 supported so as to be rotatable with respect to the first weight body 3 in a direction orthogonal to the _first axis L ₁ , and Since the second weight body 4 is configured to be rotatable integrally with the rotation shaft 40, the two weight bodies 3 and 4 can be configured as one unit, so that the drive mechanism 2 can be reduced in size. Can be planned.
[0042]
Furthermore, since the rotation of the second weight body 4 is transmitted to the power transmission shaft 77 by the bevel gears 74 and 75, and this power transmission shaft 77 is used as the rotation center axis of the first weight body 3, Both the rotational motions of the first weight body 3 and the second weight body 4 can be transmitted as the rotational motion around the common axis (first axis L ₁ ). Therefore, the power transmission mechanism 2 can be arranged in a narrow space.
[0043]
(Other embodiments)
In the above embodiment, the rotation direction conversion mechanism 76 is configured by the bevel gears 74 and 75. However, for example, the rotation direction conversion mechanism may be configured by a belt and a pulley.
[0044]
In the above embodiment, the rotational driving force of the two weight bodies 3 and 4 is transmitted to the impact applying body 8 via the one-way clutch 63 and 73. However, the direction in which the rotational driving of the impact applying body 8 is hindered. If the one-way clutch 63, 73 can be used, a torque limiter or the like may be used.
[0045]
In the above embodiment, the rotational motions of the two weight bodies 3 and 4 are transmitted to the impact applying body 8 at the same speed increasing ratio. However, the speed increasing ratio is changed by providing a speed increasing gear on one side. You may let them.
[0046]
Furthermore, if an inertial board is attached to the impact applying body 87, the impact applying body 8 can continue to rotate even after the application of external force is stopped.
[0047]
Furthermore, in the above embodiment, the power transmission shaft 77 as the rotation center axis (first axis L ₁ ) of the first weight 3 and the rotation center axis (second second axis) of the second weight 4 Although arranged so as to be orthogonal to the rotating shaft 40 as the axis L ₂ ), the angle formed by the power transmission shaft 77 and the rotating shaft 40 is 45 ° (or 135 ° depending on the direction of the external force component). ) To 90 °.
[0048]
【The invention's effect】
As described above, in the present invention, there are two weight bodies that can rotate around an axis extending in a direction intersecting each other, and the rotational motion of any of these weight bodies is transmitted to the impact imparting body to generate power. I do. For this reason, power can be generated even when an external force that only rotates one of the two weights is applied, and when an external force that rotates both of the two weights is applied, both rotations are combined. Then, it is transmitted to the impact imparting body to generate power. Therefore, even when an external force such as vibration having any component in two orthogonal directions is applied, power can be generated efficiently and can be used for various applications.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a power generator according to the present invention.
FIG. 2 is an exploded perspective view of the power generator shown in FIG.
FIG. 3 is an explanatory diagram showing a state in which, when the first weight body is rotated by an external force, the rotational motion is transmitted to the impact imparting body in the power generation device shown in FIG. 1;
4 is an explanatory diagram showing a state in which, when the second weight body is rotated by an external force, the rotational motion is transmitted to the impact imparting body in the power generation device shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Power generator 2 Drive mechanism 3 1st weight body 4 2nd weight body 5 Power transmission mechanism 6 1st transmission mechanism 7 2nd transmission mechanism 8 Impact imparting body 9 Piezoelectric element 20 Common output gear (common output member)
60 First clutch mechanism 67 Connecting gear (power transmission member)
70 Second clutch mechanism 74, 75 Bevel gear 76 Rotation direction conversion mechanism 77 Power transmission shaft L ₁ First axis L ₂ Second axis

Claims (5)

In a power generation device having a piezoelectric element, an impact imparting body that strikes the piezoelectric element to generate electric power, and a drive mechanism that drives the impact imparting body,
The drive mechanism includes a first weight body that can rotate around a first axis by an external force, and a second weight body that can rotate around a second axis extending in a direction intersecting the first axis. And a power transmission mechanism for transmitting the rotational motion of the first weight body and the rotational motion of the second weight body to the impact imparting body. 2. The power transmission mechanism according to claim 1, wherein the power transmission mechanism transmits the rotational motion of the first weight body to the common output member, and the rotational motion of the second weight body to the common output member. A second transmission mechanism that
The first transmission mechanism transmits only the rotational motion that drives the common output member in one direction out of the bidirectional rotation of the first weight body, and blocks transmission of the rotational motion in the reverse direction. 1 clutch mechanism,
The second transmission mechanism transmits only the rotational motion that drives the common output member in the one direction among the bidirectional rotations of the second weight body, and blocks transmission of the rotational motion in the reverse direction. A power generation device comprising a second clutch mechanism. In claim 2, the first clutch mechanism interrupts the transmission of the common output member from the common output member to the first weight body in the one direction.
The second clutch mechanism is configured to block transmission of the common output member from the common output member to the second weight body with respect to the movement of the common output member in the one direction. In any one of Claim 1 thru | or 3, The said 2nd axis is prescribed | regulated by the rotating shaft supported rotatably with respect to the said 1st weight body in the direction orthogonal to the said 1st axis,
The second weight body is configured to be rotatable integrally with the rotation shaft. 5. The power transmission shaft according to claim 4, wherein the second transmission mechanism is arranged coaxially with the first axis, and a rotation direction conversion mechanism that transmits the rotation of the rotation shaft to the power transmission shaft. Is configured to transmit the rotational motion of the second weight body to the power transmission shaft,
The first weight body is rotatably supported by the power transmission shaft,
The first transmission mechanism includes a power transmission body that can rotate integrally with the first weight body, and the power transmission body is disposed coaxially with the power transmission shaft. Power generation device.

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