JP2017005881A - Power generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation device using a piezoelectric element which improves reliability or lifetime by preventing damage or shape change of the piezoelectric element.SOLUTION: A power generation device comprises: a piezoelectric element fixing plate 5 to which a piezoelectric element 4 is fixed; an inner case 1 supporting both ends of the piezoelectric element fixing plate 5; an outer case 2 which is mounted to the inner case 1 in a freely rotatable manner; at least two guides 6 which are disposed in the inner case 1 and hold the piezoelectric element fixing plate 5 therebetween; connection means 7 and 8 which connect the guides 6 in an integrally displaceable manner; a main shaft bar 9 penetrating slots 61 that are formed in the guides 6; and coupling means 11, 12, 13 and 14 for eccentrically coupling a main shaft 10 that is fixed in a rotation center of the outer case 2 with the main shaft bar 9. When transmitting a rotational motion of the outer case 2 in relative to the inner case 1 from the main shaft 10 to the main shaft rod 9 via the coupling means 11, 12, 13 and 14, the rotational motion is converted into a linear motion that displaces the guides 6 in a short-side direction of the slots 61, the piezoelectric element fixing plate 5 is elastically deformed, and power is generated by distorting the piezoelectric element 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power generator. In detail, it is related with the structure of the small generator using a piezoelectric element.

In general, a piezoelectric ceramic such as PZT (lead zirconate titanate) or BaTiO ₃ (barium titanate) is used as the piezoelectric element.
Plate-shaped piezoelectric elements used for power generation and actuators include unimorph elements that have a structure in which a thin piezoelectric element and a metal plate are bonded together, and structures in which two piezoelectric elements are bonded together. There are bimorph elements configured to shrink.

  Recently, it is flexible in film form and can cover a large area, but it has high sensitivity and flexibility as well as piezoelectric polymers such as polyvinylidene fluoride (PVDF) with low piezoelectric sensitivity. There is known a flexible plate-like piezoelectric element called a macro fiber composite (MFC) which is a composite piezoelectric body in which a certain PZT is mixed.

  As shown in FIG. 13, Patent Document 1 discloses a power generation device using such a piezoelectric element. As shown in FIG. 13, one end is fixed on a circumference having a vertical axis windmill (not shown) and a central axis 111 in common. The piezoelectric element member 121 projecting vertically inside and generating electricity by bending, and is attached to the other unfixed end of the piezoelectric element member 121, and one end of the central axis 111 of the vertical axis wind turbine has one end It is periodically pushed and vibrated so as not to be disengaged from a plurality of vertical grooves 116 provided on a plurality of vertical plates 114 or shaft pillars 115 fixed to a central shaft 111 of a vertical axis wind turbine. A wind power generator including a power generation mechanism having a force receiving plate 123 that transmits power to the piezoelectric element member 121 is disclosed. In the figure, 113 is a semi-cylindrical blade, 118 is a cylinder, 119 is a column, and 124 is a fixed holding member.

  Further, as shown in FIG. 14, Patent Document 2 surrounds a disc-shaped inner ring member 211 in which a plurality of bent piezoelectric elements 221 a to 221 h are fixed radially at regular intervals on the outer periphery, and the inner ring member 211. When the inner ring member 211 or the outer ring member 212 is rotated, the outer ring member 212 to be rotated, the rotating mechanism 214 for rotating the inner ring member 211 or the outer ring member 212, and the distal end portion of the bending type piezoelectric elements 221a to 221h are contacted. Thus, a power generation device is disclosed that includes protrusions 229 provided at regular intervals on the inner peripheral surface of the outer ring member 212 so as to cause bending displacement in the bending type piezoelectric elements 221a to 221h. In the figure, 213 is an axle member, 215 is an output mechanism, 217a and 217b are current collector plates, and 218a and 218b are wires.

JP 2009-127600 A “Wind Generator Using Piezoelectric Element, Wind Speed Measuring Device, and Wind Power Generator” Japanese Patent Laying-Open No. 2005-237156 “Power Generation Device and Power Generation System”

The structure of these conventional power generation devices is such that a plate-like piezoelectric element (piezoelectric element member 121, bent piezoelectric elements 221a to 221h) is formed by a flat plate (vertical plate 114), a groove (vertical groove 116), or a protrusion (protrusion 229). ) Is not a mechanism that uniformly distorts the entire piezoelectric element.
In addition, since the electricity (high voltage) is obtained as the distortion is applied to the piezoelectric element, an unreasonable distortion in which stress is concentrated on only a part is applied rather than the entire piezoelectric element is uniformly distorted. For this reason, there has been a problem of causing damage to the piezoelectric element in the portion where the stress is concentrated.

Further, only the portion where the flat plate or the groove and the piezoelectric element are in contact with each other is worn, and as time passes, the shape changes due to wear, so that there is a problem that power generation cannot be sufficiently performed. In other words, there were also problems with life and reliability.
In this specification, the term “distortion” does not mean “distorting facts intentionally”, but is used as a general term for “distortion” and “bending”, and naturally includes “bending”.

  A power generator according to claim 1 of the present invention for solving the above-described problems is provided with a piezoelectric element fixing plate to which a piezoelectric element is fixed, an inner case that supports both ends of the piezoelectric element fixing plate, and a rotatable attachment to the inner case. An outer case, at least two guides arranged in the inner case and sandwiching the piezoelectric element fixing plate, connecting means for connecting the guides so as to be integrally displaceable, and an oblong hole formed in the guide And a coupling means that eccentrically couples the spindle fixed to the rotation center of the outer case, and rotational movement of the outer case with respect to the inner case via the coupling means. When the guide shaft is transmitted from the spindle to the spindle rod, the guide is converted into a linear motion that displaces the guide in the short side direction of the elongated round hole to elastically deform the piezoelectric element fixing plate. Ri, characterized by power to distort the piezoelectric element.

  The power generation device according to a second aspect of the present invention for solving the above-mentioned problems is the power generation device according to the first aspect, wherein the coupling means includes a crank portion protruding in a radial direction with respect to the main shaft, and one end portion at a tip of the crank portion. The first hinge and the second hinge are composed of an arm that is rotatably supported by a first hinge and has an other end rotatably supported by a second hinge. And the distance from the center of the main shaft to the tip of the crank portion is different.

  A power generation device according to a third aspect of the present invention for solving the above-mentioned problems is the power generation device according to the first or second aspect, wherein the surface shape of the surface of the guide in contact with the piezoelectric element fixing plate is a substantially circular shape or a continuous circle. It is arc-shaped.

  According to the present invention, when the rotational movement of the outer case with respect to the inner case is transmitted from the main shaft to the main shaft rod via the coupling means, the guide element is converted into a linear motion that displaces in the short side direction of the elongated round hole. The piezoelectric element can be distorted by elastically deforming the fixing plate. Therefore, compared with a conventional rotary generator, there is an effect that stress is not concentrated on a specific portion such as the tip of the piezoelectric element.

In particular, since the piezoelectric element is distorted along with the piezoelectric element fixing plate along the guide, there is an effect that the entire piezoelectric element generates power and stable power generation can be expected.
Moreover, since the guide is sandwiched and fixed, the amount of power generation does not change even if wear occurs and the shape of the guide is slightly deformed.

  That is, the problem that the flat plate or the groove and the piezoelectric element are in contact with each other as in the conventional rotary power generator is worn, and the shape change due to wear occurs over time, so that the problem of insufficient power generation has been solved. That is, there is an effect that the life and reliability are improved.

Further, as the coupling means, the spindle rod and the arm, and the crank portion and the arm are rotatably supported by the pins, so that the rotational motion of the outer case is smoothly converted into the linear motion of the guide and is also efficient. .
Also, if the surface shape of the surface in contact with the piezoelectric element fixing plate of the guide is a smooth arc shape or a substantially arc shape with a continuous polygon, the piezoelectric element is uniformly distorted along the guide, and efficient power generation is achieved. I can expect.

It is an external appearance perspective view of the electric power generating apparatus which concerns on one Example of this invention. It is a perspective view which shows the electric power generation part (a connection means is abbreviate | omitted) which is the internal structure of the electric power generating apparatus which concerns on one Example of this invention. It is a perspective view which shows the electric power generation part which is the internal structure of the electric power generating apparatus which concerns on one Example of this invention. It is the side view which looked at the electric power generation part which is the internal structure of the electric power generating apparatus which concerns on one Example of this invention from the horizontal direction, and is the state at the time of angle 90 degree | times. It is a perspective view which shows the electric power generating apparatus (a connection means is abbreviate | omitted and an inner side case and an outer side case are a broken line) which concerns on one Example of this invention. It is a perspective view which shows the electric power generating apparatus (A piezoelectric element fixing plate, a guide, and a connection means are abbreviate | omitted, an inner case and an outer case are broken lines) concerning one Example of this invention. It is the side view which looked at the electric power generation part (a connection means is abbreviate | omitted) which is the internal structure of the electric power generating apparatus which concerns on one Example of this invention from the horizontal direction, and is the state at the time of 0 degrees of angles. It is a perspective view which shows the electric power generation part (a connection means is abbreviate | omitted) which is the internal structure of the electric power generating apparatus which concerns on one Example of this invention, and shows the relationship between a main axis | shaft, an arm, and a main axis | shaft rod when rotation starts. It is the side view which looked at the electric power generation part (a connection means is abbreviate | omitted) which is the internal structure of the electric power generating apparatus which concerns on one Example of this invention from the horizontal direction, and is the state at the time of an angle of 180 degree | times. It is the side view which looked at the electric power generation part (a connection means is abbreviate | omitted) which is the internal structure of the electric power generating apparatus which concerns on one Example of this invention from the horizontal direction, and is the state at the time of angle 270 degree | times. It is a perspective view which shows the electric power generation part (a piezoelectric element fixing plate is abbreviate | omitted) which is the internal structure of the electric power generating apparatus which concerns on the other Example of this invention. It is the side view which looked at the electric power generation part (a piezoelectric element fixing plate is abbreviate | omitted) which is the internal structure of the electric power generating apparatus which concerns on the other Example of this invention from the horizontal direction. It is the schematic which shows the prior art described in patent document 1. FIG. It is the schematic which shows the prior art described in patent document 2. FIG.

The present invention has been made to solve the above-described problems of the prior art, and provides a power generation device using a piezoelectric element that prevents damage and shape change of the piezoelectric element and improves reliability and life. With the goal.
In addition, as a flat piezoelectric element, a unimorph element having a structure in which a thin piezoelectric element and a metal plate are bonded together or a structure in which two piezoelectric elements are bonded to each other is configured such that when one extends, the other contracts. Bimorph elements can be used.

Also, a flexible flat plate called a macro fiber composite (MFC), which is a composite piezoelectric material in which a piezoelectric polymer such as polyvinylidene fluoride having low piezoelectric sensitivity and PZT having high sensitivity and flexibility are mixed. Piezoelectric elements (MFC elements) can also be used.
The piezoelectric element of the present embodiment is not limited to the type as long as it is a piezoelectric element that can be formed into a flat plate shape, such as a unimorph element, a bimorph element, or an MFC element.

A power generator according to an embodiment of the present invention is shown in FIGS. FIG. 1 is an external perspective view of the power generator of this embodiment.
As shown in FIG. 1, the power generation apparatus of the present embodiment has a hemispherical outer case 2 rotatably mounted on both sides of a fixed annular inner case 1, and a power generation unit is provided therein. Is stored.

The power generator of the present embodiment is generally spherical as a whole, and the diameter of the inner case 1 and the outer case 2 are substantially the same, and the center of the inner case 1 and the rotation center of the outer case 2 coincide with each other. Yes. A plurality of grooves 3 are radially formed in the outer case 2 along the hemispherical outer peripheral surface.
FIG. 2 shows the internal structure of the power generator of this example. FIG. 2 is a perspective view showing the power generation unit with one outer case 2 removed from the inner case 1.

As shown in FIG. 2, in the inner case 1, four plate-like piezoelectric element fixing plates 5 to which the piezoelectric elements 4 are fixed are arranged in the upper and lower directions in the figure, and both ends of the piezoelectric element fixing plates 5 are arranged in the inner case 1. It is inserted and supported by the slit formed. The piezoelectric element fixing plate 5 is made of a flexible material that easily elastically deforms. As the piezoelectric element 4, a piezoelectric element that can be formed in a flat plate shape, for example, a unimorph element, a bimorph element, an MFC element, or the like is used.
In the inner case 1, five flat guides 6 that sandwich the piezoelectric element fixing plate 5 in the vertical direction in the figure are arranged. That is, four piezoelectric element fixing plates 5 and five guides 6 are alternately arranged in parallel. The guide 6 is a guide that presses the piezoelectric element fixing plate 5 and elastically deforms it.

Further, as shown in FIGS. 3 and 4, as connecting means for connecting these five guides 6 so as to be integrally displaceable, screws 7 passing through these five guides 6 up and down and these screws 7 are fastened. A nut 8 is provided. Four connecting means including screws 7 and nuts 8 are provided at four corners of the guide 6. In FIG. 2, the connecting means is omitted.
Although not shown in FIG. 3, the four piezoelectric element fixing plates 5 are sandwiched inside four screws 7 and screws 8 at the front, rear, left and right connecting the five guides 6.

  Accordingly, since these five guides 6 are connected by screws 7 and nuts 8, they are integrally displaced up and down (displaced upward in FIG. 4) as shown in FIG. As will be described later, the four piezoelectric element fixing plates 5 sandwiched between the five guides 6 are pressed by the guides 6 and elastically deformed along the guides 6. As a result, the piezoelectric element 4 is distorted to generate power.

  Here, since the guide 6 is in contact with the piezoelectric element fixing plate 5, the piezoelectric element fixing plate 5 is attached to the piezoelectric element fixing plate 5 in order to uniformly elastically deform the piezoelectric element fixing plate 5, and thus to uniformly distort the piezoelectric element 4. The surface shape of the contacting surface is an arc shape that curves smoothly. As used herein, “arc-shaped” refers to a shape in which the guide 6 is thicker toward the center, that is, a shape that is convex upward and downward, as shown in FIG. 4 in which the internal structure is observed from the side.

  Of course, the three guides 6 at the center have an arcuate surface shape in which both the upper and lower surfaces are smoothly curved because the upper and lower surfaces are in contact with the piezoelectric element fixing plate 5, while the guides 6 at the upper and lower ends are on the inner side. Since only the side surface is in contact with the piezoelectric element fixing plate 5, only the inner side surface has an arcuate surface shape that is smoothly curved. That is, the three guides 6 at the center and the guides 6 at the upper and lower ends are different in shape. Of course, the five guides 6 may have the same shape in consideration of productivity.

As described above, when the surface shape of the surface of the guide 6 in contact with the piezoelectric element fixing plate 5 is an arc, the shape of the guide 6 is less likely to change due to wear with respect to the piezoelectric element fixing plate 5. Further, even if wear occurs and the arcuate shape of the guide 6 is slightly deformed, the power generation amount does not change. As a result, there is an advantage that the power generation amount is not reduced.
In addition, the guide 6 and the piezoelectric element fixing plate 5 are not closely attached and fixed without any gaps, but the guide 6 is preferably sandwiched between the piezoelectric element fixing plate 5 to such an extent that the piezoelectric element fixing plate 5 can be freely deformed. . By doing so, wear of the guide 6 and the piezoelectric element fixing plate 5 can be suppressed.

For example, a spacer (not shown) may be passed through a screw 7 that passes through the guide 6 so that the distance between the guide 6 and the guide 6 can be ensured so that the piezoelectric element fixing plate 5 can be freely deformed.
Furthermore, as shown in FIG. 4 in which the internal structure is observed from the side, each of the three guides 6 at the center is formed with an oblong hole 61 at the center. That is, three oblong holes 61 are formed, and the spindle rod 9 passes through one oblong hole 61 located at the center thereof.

The oblong hole 61 of the guide 6 requires only one of the centers through which the spindle 9 passes, and the oblong hole 61 that is not necessary for the other two guides 6 is simply provided from the viewpoint of productivity. Because. For example, when the three guides 6 at the center are mass-produced with a resin material or the like, only one mold is required.
Here, as shown in FIG. 4, the oblong hole 61 has a long side direction in the left-right direction and a short side direction in the up-down direction. Both ends in the long side direction are semicircular with a diameter equal to the short side. The short side of the oblong hole 61 is slightly larger than the diameter of the spindle 9.

  Therefore, the spindle 9 can freely move within a certain range in the long side direction of the long round hole 61, but is restrained in the short side direction of the long round hole 61. Therefore, the guide 6 is displaced together with the spindle 9 by being restrained by the spindle 9 in the vertical direction which is the short side direction of the elongated hole 61. In the left-right direction, which is the long side direction of the oblong hole 61, the guide 6 is not displaced, and only the spindle rod 9 moves.

  A coupling means for eccentrically coupling the main shaft rod 9 penetrating the oblong hole 61 and the main shaft 10 fixed to the rotation center of the outer case 2 will be described with reference to FIGS. 5 and 6, the groove 3 of the outer case 2 is not shown in order to facilitate understanding of the internal structure.

As shown in FIG. 6, main shafts 10 are respectively fixed to the rotation centers of the outer cases 2, and crank portions 11 projecting perpendicularly in the radial direction are formed on the main shafts 10.
One end of a rectangular arm (metal fitting) 13 is rotatably supported at the tip of the crank portion 11 by a first hinge 12, while the other end of the arm 13 is attached to both ends of the spindle 9. Each pin is rotatably supported by the second hinge 14.

  Here, a distance A (referred to as “main shaft lateral length”) A between the rotation center of the main shaft 10 and the first hinge 12 of the crank portion 11 is longer than the length of the arm 13. More precisely, the lateral length A of the main shaft is longer than the distance B (referred to as “distance between hinges”) B between the first hinge 12 and the second hinge 14 in the arm 13.

  Therefore, as shown in FIG. 7 in which the internal structure is observed from the side, the main shaft 10 fixed to the rotation center of the outer case 2 and the main shaft rod 9 penetrating the elongated round hole 61 of the guide 6 do not overlap. That is, the center of the main shaft 10 and the center of the main shaft rod 9 do not coincide with each other, and the main shaft rod 9 is coupled to the main shaft 10 in an eccentric state. The amount of eccentricity is (main shaft lateral length A−hinge distance B). In FIG. 7, the connecting means is omitted. The same applies to FIG. 8, FIG. 9, and FIG.

Therefore, when the outer case 2 is rotated with respect to the inner case 1, the rotational movement of the outer case 2 is caused by the main shaft 10 via the coupling means including the crank portion 11, the first and second hinges 12, 14 and the arm 13. Since the main shaft rod 9 is eccentric with respect to the main shaft 10 when being transmitted from the main shaft 9 to the main shaft 9, the guide 6 is moved in the crank direction as indicated by the arrow in the drawing, and the guide 6 is moved to the short side of the oblong hole 61. It is smoothly converted into a linear motion that is displaced by reciprocating in the vertical direction in the figure. As a result, as shown in FIG. 4, the piezoelectric element fixing plate 5 is pressed by the guide 6 and elastically deformed, and the piezoelectric element 4 is also distorted together to efficiently generate power.
In addition, since the guide 6 is gently fixed with the piezoelectric element fixing plate 5 interposed therebetween, wear does not easily occur, and the amount of power generation does not change even if wear occurs and the shape of the guide 6 is slightly deformed.
The mechanism for rotating the outer case 2 is not limited to a specific one, but a plurality of propeller-shaped slats can be installed and applied to wind power and hydraulic power generators.

The operation of the power generator of the present embodiment having the above configuration will be described below.
As shown in FIG. 7, when the main shaft 10 is at the 0 degree position, the arm 13 is substantially horizontally leftward in the 0 degree direction, and the main shaft rod 9 is disposed on the leftmost side of the oblong hole 61. Since the guide 6 is at the center position of the inner case 1, no force is applied to the piezoelectric element fixing plate 5.

  Here, with respect to the angle, it is assumed that the crank portion 11 and the arm 13 are positioned in the 9 o'clock direction (horizontal left direction) with respect to the main shaft 10 and the clockwise direction is indicated as positive.

  Therefore, at 0 degree, the crank part 11 and the arm 13 are located in the 9 o'clock direction with respect to the main shaft 10, and at 90 degrees, the crank part 11 and the arm 13 are located in the 12 o'clock direction with respect to the main axis 10, At 180 degrees, the crank portion 11 and the arm 13 are positioned in the 3 o'clock direction with respect to the main shaft 10, and at 270 degrees, the crank portion 1 and the arm 13 are positioned in the 6 o'clock direction with respect to the main shaft 10.

  As shown in FIG. 8, when the outer case 2 starts to rotate, the spindle rod 9 starts to move gradually from the leftmost side of the oblong hole 61 to the right side. At this time, the guide 6 starts to move to a position above the center of the inner case 1 and is pressed by the guide 6 so that upward force is applied to the electrical element fixing plate 5. As shown in FIG. 8, one end of the arm 13 is a first hinge 12 that is pin-supported and fixed to the main shaft 10 via a crank portion 11, and the other is a second hinge that is pin-supported and fixed to the main shaft rod 9. Therefore, the main shaft 10 rotates without moving the central axis, and the main shaft rod 9 moves up, down, left, and right without rotating.

  As shown in FIG. 4, when the main shaft 10 is at a position of 90 degrees, the arm 13 is substantially vertically upward in the 90-degree direction, and the main shaft rod 9 is disposed at the center of the oblong hole 61. Since the guide 6 moves to a position above the center of the inner case 1, as shown by an arrow in the figure, an upward force is applied to the piezoelectric element fixing plate 5 by being pressed by the guide 6.

  As shown in FIG. 9, when the main shaft 10 is at a position of 180 degrees, the arm 13 is substantially horizontally rightward in the 180-degree direction, and the main shaft rod 9 is disposed on the rightmost side of the oblong hole 61. Since the guide 6 is located at the center of the inner case 1, no force is applied to the piezoelectric element fixing plate 5 from the guide 6.

  As shown in FIG. 10, when the main shaft 10 is at a position of 270 degrees, the arm 13 is substantially vertically downward in the direction of 270 degrees, and the main shaft rod 9 is disposed at the center of the oblong hole 61. Since the guide 6 moves to a position below the center of the inner case 1, a downward force is applied to the piezoelectric element fixing plate 5 by being pressed by the guide 6 as indicated by an arrow in the figure.

  As described above, the surface shape of the surface of the guide 6 that contacts the piezoelectric element fixing plate 5 is a smooth arc shape, and when the guide 6 moves up and down, the piezoelectric element follows the smooth arc shape of the guide 6. The fixing plate 5 is distorted in the vertical direction together with the piezoelectric element 4 to generate electricity.

  In the present invention, the magnitude of the distortion of the piezoelectric element fixing plate 5 is limited by the arcuate surface shape of the guide 6, and the magnitude of the distortion of the entire piezoelectric element fixing plate 5 does not become excessive. Excessive stress is not concentrated on the specific part of the substrate, and the life and reliability of the piezoelectric element fixing plate 5 are improved.

  The guide 6 has an arc-like smooth curved surface so that the entire piezoelectric element fixing plate 5 is distorted in an arc shape. However, the shape of the piezoelectric element fixing plate 5 may be uniformly distorted. For example, it is not limited to this. For example, although not shown in the drawings, a guide surface shape or the like in which a polygonal plane is continuous and has a substantially arc shape may be used.

  As described above, in the structure of the conventional power generation apparatus, there is no mechanism that uniformly distorts the entire piezoelectric element, and an excessive distortion that concentrates stress on only a part is added. The present invention solves the problem of causing damage to the piezoelectric element.

  Moreover, since the rotational motion obtained from the outside is converted into a linear motion and the piezoelectric element 4 is distorted, the magnitude of the distortion of the piezoelectric element 4 is controlled, and the piezoelectric element 4 is prevented from being damaged or changed in shape. It is possible to provide a power generation device using a piezoelectric element with improved lifetime.

A power generation apparatus according to another embodiment of the present invention is shown in FIGS. The present embodiment shows another structure of the connecting means.
In the embodiment described above, the screw 7 and the nut 8 are used as the connecting means, but the connecting means is not limited to this.
In this embodiment, as shown in FIGS. 11 and 12, as the connecting means, fixing plate members 15 in contact with the four corners of the end surfaces of the five guides 6 are arranged, and these fixing plate members 15 are screwed or bonded ( (Not shown) and fixed integrally to the five guides 6. Other configurations are the same as those in the above-described embodiment.

Although the plate-shaped piezoelectric element fixing plate is omitted in FIGS. 11 and 12, all four plates are sandwiched between five guides 6.
Similar to the above-described embodiments, the piezoelectric element fixing plate 5 itself is not fixed in close contact with the central portion (convex portion) of the two guides 6 without a gap, but has a gap that can be freely deformed. And is gently held by the guide 6 via the guide 6.

  In the above-described embodiment, the piezoelectric element fixing plate 5 is sandwiched inside the screw 7 and the nut 8, whereas in this embodiment, the size can be set to the full width of the guide 6. This is advantageous in terms of an increase in.

  The power generator of the present invention can be widely used industrially as a small generator using a piezoelectric element.

DESCRIPTION OF SYMBOLS 1 Inner case 2 Outer case 3 Groove 4 Piezoelectric element 5 Piezoelectric element fixing plate 6 Guide 61 Oval hole 7 Screw 8 Nut 9 Spindle rod 10 Spindle 11 Crank portion 12 First hinge 13 Arm 14 Second hinge 15 Fixed plate member

Claims (3)

A piezoelectric element fixing plate to which the piezoelectric element is fixed;
An inner case for supporting both ends of the piezoelectric element fixing plate;
An outer case rotatably mounted on the inner case;
At least two guides disposed in the inner case and sandwiching the piezoelectric element fixing plate;
Connecting means for connecting the guides together so as to be displaceable;
A spindle rod that passes through an elongated hole formed in the guide;
A main shaft fixed to the rotation center of the outer case and a coupling means for eccentrically coupling the main shaft rod;
When the rotational movement of the outer case with respect to the inner case is transmitted from the main shaft to the main shaft rod via the coupling means, it is converted into a linear motion that displaces the guide in the short side direction of the round hole. And generating power by distorting the piezoelectric element by elastically deforming the piezoelectric element fixing plate. The coupling means includes a crank portion protruding in a radial direction with respect to the main shaft;
One end of the crank portion is pin-supported and fixed rotatably by a first hinge, and the other end of the main shaft is pin-supported and fixed by a second hinge.
2. The power generation device according to claim 1, wherein a distance between the first hinge and the second hinge is different from a distance between a center of the main shaft and a tip of the crank portion. The power generator according to claim 1, wherein a surface shape of a surface of the guide that is in contact with the piezoelectric element fixing plate is an arc shape or a substantially arc shape having a continuous polygon.

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