JP6240556B2 - Magnetostrictive vibration power generator - Google Patents

Description

  The present invention relates to a magnetostrictive vibration power generation apparatus that converts vibration energy into electric energy by utilizing a change in magnetic permeability with respect to strain of a power generation element formed of a magnetostrictive material.

  2. Description of the Related Art Conventionally, there is a magnetostrictive vibration power generation apparatus using a power generation element formed of a magnetostrictive material as a type of vibration power generation apparatus that converts vibration energy into electric energy. For example, in the magnetostrictive vibration power generation device disclosed in Japanese Patent No. 4905820 (Patent Document 1), a strength member (11b) formed of a magnetic material and a power generation element (11a) formed of a magnetostrictive material are connected in parallel. A yoke member (15) extending in parallel with the strength member and the power generation element is provided. Further, a bias magnetic field by a magnet (14) is applied to a closed magnetic path including a power generation element and a yoke member, and a coil (12) is wound around the closed magnetic path. ing. Then, in a mounting state where one end of the strength member is fixed to the vibration member, the deformation of the strength member at the time of vibration input causes distortion in the power generation element, and the permeability of the power generation element changes, so that the coil is electromagnetically Induction voltage is generated.

  By the way, in the magnetostrictive vibration power generator, the resonance frequency for the bending deformation of the strength member is set according to the assumed main input vibration frequency, and the deformation of the strength member is actively generated in the resonance state at the time of vibration input. As a result, a large distortion of the power generation element can be obtained, and the power generation efficiency can be improved. Since the strength member is generally a high-rigidity member formed of stainless steel or the like, the deformation rigidity of the strength member must be kept small in order to set the resonance frequency of the strength member to a practical frequency. Is desirable.

  However, the substantial resonance frequency of the strength member in the magnetostrictive vibration power generation apparatus is set according to the deformation rigidity of the entire structure including the power generation element and the yoke member fixed in parallel with the strength member. In a structure including a highly rigid yoke member, the deformation rigidity of the structure is increased, and the substantial resonance frequency of the strength member may be set to a high frequency beyond the practical range.

  It is also possible to suppress the reinforcing action of the strength member by the yoke member by connecting the yoke member so as to be capable of relative displacement without being fixed to the strength member by the magnetic force of the magnet. Dropping off from is a problem. Therefore, fixing such as bonding or screwing is actually required, and it is difficult to prevent the strength member from being reinforced by the yoke member.

Japanese Patent No. 4905820

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that the reinforcing action of the strength member by the yoke member is suppressed even when the yoke member is provided in the strength member. Another object of the present invention is to provide a magnetostrictive vibration power generator having a novel structure in which a change in the substantial resonance frequency of the strength member is reduced and the magnet and yoke member are prevented from falling off from the strength member.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, the first aspect of the present invention includes a longitudinal strength member formed of a ferromagnetic material and fixed at one end to the vibration member, and the power generation element formed of a magnetostrictive material on the strength member. Are mounted in parallel, and a yoke member magnetically connected to the power generating element is disposed, and a bias magnetic field is applied to a closed magnetic path including the power generating element and the yoke member. Magnetostrictive vibration in which a magnet is provided and a coil is wound around the closed magnetic path so that a voltage is generated in the coil based on a change in permeability due to distortion of the power generation element The power generation device includes a holding holder that holds a magnetic connection state of the magnet and the yoke member with respect to the strength member while allowing relative displacement of the yoke member with respect to the strength member. A displacement limiting means for limiting a relative displacement amount of the holding holder with respect to the strength member is configured by a fixing member that sandwiches and fixes at least one end of the child with the strength member in an overlapped state. It is characterized by being.

  According to the magnetostrictive vibration power generation device having the structure according to the first aspect as described above, since the magnetic connection state of the magnet and the yoke member is maintained by the holding holder, the target power generation performance is stabilized. It is demonstrated.

  In addition, since the relative displacement of the yoke member with respect to the strength member is allowed, the strength member can be prevented from being reinforced by the yoke member, and the resonance frequency of the strength member can be prevented from deviating from the frequency of the input vibration. . Thereby, when the vibration is input, the deformation amount of the strength member is greatly obtained in the resonance state, and distortion is effectively generated in the power generation element, so that the target power generation performance is realized.

  In addition, since the power generation element is sandwiched between the strength member and the fixing member, there is no need to provide a special mounting structure such as a screw hole in the power generation element, and the strength of the power generation element is ensured to be large and The shape and size are set with a large degree of freedom.

  Furthermore, since the fixing member that supports the power generating element constitutes the displacement limiting means, the relative displacement amount of the holding holder with respect to the strength member can be limited with a small number of parts and with high reliability by mechanical means. Note that the holding holder may be limited by the displacement limiting means in a state in which the relative displacement with respect to the strength member is allowed to some extent, and the holding holder is substantially fixed so that the relative displacement amount with respect to the strength member becomes substantially zero. The relative displacement may be limited in the state.

  According to a second aspect of the present invention, in the magnetostrictive vibration power generator described in the first aspect, a locking projection is formed on one of the strength member and the holding holder, and the strength member A locking hole is formed in either one of the holding holders, and the amount of relative displacement of the holding holder with respect to the strength member is limited by inserting the locking projection into the locking hole, and the engagement The stop projection has a smaller diameter than the locking hole, and relative displacement of the holding holder with respect to the strength member is allowed.

  According to the second aspect, the locking projection and the inner peripheral surface of the locking hole are abutted and locked in a direction substantially orthogonal to the insertion direction, whereby the locking projection having a smaller diameter than the locking projection is formed. The relative displacement between the holding holder and the strength member is limited with a simple structure for inserting the holder. Accordingly, the magnet and the yoke member are appropriately held by the holding holder in a magnetic connection state with respect to the strength member.

  In addition, since the locking projection has a smaller diameter than the locking hole and the locking projection can be displaced in the locking hole, the holding holder is allowed to be displaced relative to the strength member. The yoke member connected and held to the strength member is allowed to be displaced relative to the strength member. Therefore, it is possible to prevent the reinforcing effect of the yoke member from adversely affecting the deformation of the strength member with respect to the vibration input.

  According to a third aspect of the present invention, in the magnetostrictive vibration power generator described in the first or second aspect, the fixing member includes a restricting portion that faces the holding holder on the side opposite to the strength member. And the relative displacement of the holding holder with respect to the strength member is allowed in the opposing direction of the restricting portion and the strength member, and the holding holder is brought into contact with the strength member by the contact between the restriction portion and the holding holder. The relative displacement is limited.

  According to the third aspect, since the holding holder and the restricting portion of the fixing member are disposed to face each other, the holding holder is allowed to be relatively displaced with respect to the strength member by the contact between the holding holder and the restricting portion. The amount of displacement is mechanically limited. Therefore, restraining of the strength member by the holding holder and the yoke member is avoided, and the magnetic connection state of the magnet and the yoke member to the strength member is maintained with high reliability.

  According to a fourth aspect of the present invention, in the magnetostrictive vibration power generation apparatus described in the third aspect, the first clamping member and the second clamping member sandwich the strength member and the end of the power generation element. It has a structure in which a sandwiching member is combined, the first sandwiching member has the restricting portion, and the second sandwiching member has a fitting concave groove that is externally fitted to the strength member, The side wall portion of the fitting groove in the second clamping member fitted to the strength member is fixed to the first clamping member, whereby the power generating element is fixed to the strength member. The first clamping member is fixed to the strength member, and the restricting portion is positioned with respect to the strength member.

  According to the fourth aspect, by attaching the first clamping member and the second clamping member so as to sandwich the strength member and the power generation element, the power generation element is strengthened without providing a special mounting structure for the power generation element. Can be attached to a member. Furthermore, since the fixing member is attached to the strength member by inserting the strength member between the first clamping member and the second clamping member, it is necessary to provide a fixing member mounting structure (such as a screw hole) on the strength member. Therefore, stress concentration in the strength member is avoided, and the durability of the strength member is improved, and the stress is efficiently transmitted to a wide range of the power generation element.

  According to a fifth aspect of the present invention, in the magnetostrictive vibration power generator described in any one of the first to fourth aspects, the magnets are disposed on both sides in the length direction of the strength member, The yoke member extends across the magnet, and the holding holder includes a pair of connection holding portions that hold the magnet and the yoke member in a magnetic connection state with respect to the strength member. These connection holding portions are connected to each other by a longitudinal connection portion extending in parallel with the strength member.

  According to the fifth aspect, the pair of connection holding portions that hold the end portions of the magnet and the yoke member in a magnetically connected state with respect to the strength member are connected to each other by the connecting portion, and the pair of connection holdings are held. The part can be handled as one part. Thereby, both ends of the magnets on both sides in the length direction and the yoke member can be maintained in a magnetically connected state to the strength member with a small number of parts.

  According to a sixth aspect of the present invention, in the magnetostrictive vibration power generator described in any one of the first to fifth aspects, the magnets are respectively disposed on both sides in the width direction of the strength member. The magnets are respectively held in a magnetically connected state to the strength members by the holding holders, and the holding holders for holding the magnets are respectively provided by the fixing members that extend across the strength members in the width direction. The relative displacement amount with respect to the strength member is limited.

  According to the sixth aspect, since the holding holders provided on both sides of the strength member in the width direction are limited in relative displacement amount with respect to the strength member by the fixing member straddling the strength member in the width direction, The displacement limiting means of the holding holder on both sides in the direction can be configured with a small number of fixing members.

  According to a seventh aspect of the present invention, in the magnetostrictive vibration power generation device described in any one of the first to sixth aspects, the holding holder is made of resin.

  According to the seventh aspect, the holding holder can be obtained lightly and inexpensively, and it becomes easier to set the deformation rigidity of the holding holder to be smaller than that made of metal, and the holding holder further inhibits the deformation of the strength member. It becomes difficult to do. Moreover, the holding holder can be designed with a large degree of freedom in shape.

  According to the present invention, the holding holder for holding the magnet and the yoke member in a magnetically connected state with respect to the strength member is provided, and the yoke member is allowed to be displaced relative to the strength member by the holding holder. As a result, the desired power generation performance at the time of vibration input can be stably obtained, the restraint of the strength member by the yoke member is prevented, and excellent power generation efficiency due to effective elastic deformation of the strength member is also realized. In addition, the fixing member that fixes the power generating element to the strength member in an overlapping state constitutes a displacement limiting means that limits the relative displacement amount of the holding holder with respect to the strength member. Therefore, it is not necessary to provide the power generating element with a mounting structure such as a screw hole, and the design flexibility such as the shape of the power generating element and the durability can be improved, and the holding holder can be removed from the strength member with a small number of parts. Separation can be prevented.

1 is a perspective view showing a magnetostrictive vibration power generation apparatus as a first embodiment of the present invention. FIG. 2 is a plan view of the magnetostrictive vibration power generator shown in FIG. 1. FIG. 3 is a bottom view of the magnetostrictive vibration power generator shown in FIG. 2. FIG. 3 is a front view of the magnetostrictive vibration power generator shown in FIG. 2. VV sectional drawing of FIG. VI-VI sectional drawing of FIG. FIG. 2 is an exploded perspective view of the magnetostrictive vibration power generator shown in FIG. 1. The figure which expands and shows the VIII-VIII cross section of FIG. The figure which expands and shows the IX-IX cross section of FIG. The perspective view which shows the magnetostrictive vibration electric power generating apparatus as 2nd embodiment of this invention. FIG. 11 is a plan view of the magnetostrictive vibration power generator shown in FIG. 10. The bottom view of the magnetostrictive vibration electric power generating apparatus shown in FIG. The front view of the magnetostrictive vibration electric power generating apparatus shown in FIG. FIG. 11 is an exploded perspective view of the magnetostrictive vibration power generator shown in FIG. 10.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 6 show a magnetostrictive vibration power generation apparatus (hereinafter referred to as vibration power generation apparatus) 10 as a first embodiment of the present invention. The vibration power generation apparatus 10 has a structure in which a power generation element 14 is attached to a longitudinal strength member 12. In the following description, in principle, the length direction is the left-right direction in FIG. 2, which is the left-right direction, the width direction is the up-down direction in FIG. 2, which is the front-rear direction, and the thickness direction is the up-down direction. The up and down directions in FIG.

  More specifically, the strength member 12 is a substantially rectangular rod-shaped member formed of a ferromagnetic material such as stainless steel (such as martensitic stainless steel, ferritic stainless steel, or precipitation hardened stainless steel) or iron. An attachment hole 16 penetrating in the thickness direction is formed at one end portion in the length direction (left end portion in FIG. 2). Then, as shown by a two-dot chain line in FIG. 5, when the mounting bolt 18 inserted through the mounting hole 16 of the strength member 12 is screwed to the vibration member 20, one end in the length direction of the strength member 12. The portion is fixed to the vibration member 20. In addition, in the mounting state on the vibration member 20, the strength member 12 has one end (left end in FIG. 2) as a fixed end fixed to the vibration member 20, and the other end (right end in FIG. 2) is free. It is considered as an end. Although the vibration member 20 is not specifically limited, Vehicle bodies, such as a motor vehicle, household appliances, such as a washing machine, the floor of a building, etc. are illustrated.

  As shown in FIG. 5, a concave groove 22 that opens toward one side in the thickness direction (upward in FIG. 5) is formed in the longitudinal direction intermediate portion of the strength member 12. The concave groove 22 is formed at a position shifted from the center to the fixed end side (left side in FIG. 5) in the length direction of the strength member 12, and is substantially constant over the entire length of the strength member 12 in the width direction. The cross-sectional shape extends continuously. By forming such a concave groove 22, the strength member 12 includes an attachment portion 24 positioned on the fixed end side with respect to the concave groove 22, and a mass portion 26 positioned on the free end side with respect to the concave groove 22. The bottom wall portion of the concave groove 22 and the deformation portion 28 that connects the attachment portion 24 and the mass portion 26 to each other are integrally provided. In addition, since the concave groove 22 is located on the fixed end side with respect to the center in the length direction of the strength member 12, the mass portion 26 is longer than the attachment portion 24.

  Further, the entire inner surface of the bottom wall of the concave groove 22 is composed of a continuous curved surface concave upward, and the depth dimension of the concave groove 22 gradually changes in the length direction of the strength member 12. . Note that the strength member 12 of the present embodiment has a front-rear width dimension that is substantially constant over the entire length including the deformed portion 28, and a lower surface (lower surface in FIG. 5) that is a flat surface. The bending stiffness in the thickness direction changes with the change in the depth dimension 22, and the bending stiffness in the thickness direction is minimized at the deepest portion where the deformed portion 28 is the thinnest.

  Furthermore, the inner surfaces of the pair of side walls of the concave groove 22 are flat surfaces that extend substantially perpendicular to the length direction of the strength member 12, and the upper end portion is directed toward the opening side (upper side in FIG. 5). The strength member 12 is gradually inclined outward in the length direction. In this embodiment, the inner surface of the opening edge of the groove 22 has an arc-shaped cross section that is convex toward the opening side and the groove inward. .

  Further, locking holes 32 are formed on both sides of the strength member 12 in the longitudinal direction with respect to the concave groove 22. The locking holes 32 are opened on the front and rear side surfaces of the strength member 12. In this embodiment, the strength member 12 penetrates the strength member 12 in the width direction with a substantially constant circular cross section and opens on the front and rear side surfaces of the strength member 12. ing. In addition, the bottomed recess shape which does not penetrate the strength member 12 may be sufficient as a locking hole, and it can each be formed independently so that it may open to each one surface before and behind the strength member 12.

  The power generation element 14 is a long plate-shaped member made of a magnetostrictive material and extending in a substantially constant rectangular cross section, and both end portions are overlapped with the upper surface of the strength member 12. As a result, the power generation element 14 extends across the opening of the concave groove 22 in the length direction of the strength member 12, and is arranged in parallel with the deformed portion 28 of the strength member 12 so as to be vertically separated.

  The magnetostrictive material used as the material for forming the power generation element 14 is not particularly limited, but iron-gallium alloy, iron-nickel alloy, iron-cobalt alloy, and the like are preferably employed. It can also be used in combination. In addition, the magnetostrictive material forming the power generation element 14 includes at least one kind of rare earth elements such as yttrium (Y) and praseodymium (Pr), thereby obtaining a large change in magnetic permeability of the power generation element 14 described later. You can also. Further, preferably, the bending rigidity of the power generation element 14 is made smaller than the minimum bending rigidity in the deformation portion 28 of the strength member 12, and the power generation element 14 is more likely to bend and deform than the strength member 12.

  A coil 34 is attached to the power generation element 14. The coil 34 is formed of a conductive metal wire wound around the power generation element 14, and an induced electromotive force is generated in the coil 34 by electromagnetic induction in accordance with a change in magnetic flux in the power generation element 14. Further, the coil 34 enters the concave groove 22 of the strength member 12 when the power generation element 14 is attached to the strength member 12, and interference between the coil 34 and the strength member 12 is avoided. In addition, although it is not clear in the drawing, both ends of the metal wire constituting the coil 34 are electrically connected to a storage battery or an electric device (such as an LED or an electronic circuit).

  Further, magnets 36a and 36b are disposed on both front and rear sides of the strength member 12, respectively. As the magnet 36, various known permanent magnets such as a ferrite magnet, an alnico magnet, and a neodymium magnet are employed, and are magnetized in the front-rear direction of the strength member 12. The magnets 36a and 36b are attached to one side of the concave groove 22 sandwiched in the length direction. The magnet 36a is fixed to the front and rear side surfaces of the attachment portion 24 of the strength member 12, and the magnet 36b is strong. The member 12 is fixed to the front and rear side surfaces of the mass portion 26 and is magnetically connected to the strength member 12. Further, the magnet 36a and the magnet 36b are magnetized in opposite directions. For example, when the strength member 12 side of the magnet 36a is an N pole, the strength member 12 side of the magnet 36b is an S pole. Furthermore, the pair of magnets 36a and 36a are fixed to the strength member 12 at substantially the same position in the length direction from one side of the front and rear, and the pair of magnets 36b and 36b are provided to the strength member 12. On the other hand, at substantially the same position in the length direction, they are fixed from one side of the front and rear.

  Further, yoke members 38 are arranged in parallel on the front and rear sides of the strength member 12. The yoke member 38 has a rod shape or a longitudinal plate shape extending substantially parallel to the strength member 12, and is formed of a ferromagnetic material such as stainless steel or iron, like the strength member 12. The yoke member 38 extends over the magnet 36a and the magnet 36b, one end thereof is overlapped and fixed on the front and rear outer surfaces of the magnet 36a, and the other end is attached to the front and rear outer surfaces of the magnet 36b. It is overlapped and fixed. Thereby, the yoke member 38 is magnetically connected to the strength member 12 via the magnets 36a and 36b.

  The means for fixing the magnet 36 to the strength member 12 and the means for fixing the yoke member 38 to the magnet 36 are not particularly limited. For example, the magnet 36 is realized by magnetic attraction, adhesive, mechanical locking, or the like. Can be done. However, the strength member 12 and the magnet 36 are fixed so as to be relatively displaceable, or the magnet 36 and the yoke member 38 are fixed so as to be relatively displaceable, and the relative displacement of the yoke member 38 with respect to the strength member 12 is determined. Is acceptable. In the present embodiment, the strength member 12 and the yoke member 38 are both fixed to the magnet 36 so as to be relatively displaceable by magnetic attraction.

  As described above, the pair of front and rear magnets 36a and 36b and the pair of front and rear yoke members 38 are attached to the respective front and rear side surfaces of the strength member 12, whereby the strength member 12, the power generating element 14, the magnet 36a, A closed magnetic path 40 is formed by 36 b and the yoke member 38. A bias magnetic field from the magnets 36a and 36b is applied to the power generating element 14 constituting the closed magnetic path 40. Note that the coil 34 is disposed on the closed magnetic path 40 by being wound around the power generation element 14.

  Here, the magnets 36 a and 36 b and the yoke member 38 are covered with a holding holder 42. The holding holder 42 is a longitudinal member made of synthetic resin, and a pair of strength holders 12 are arranged in the front and rear of the strength member 12 and overlap the magnets 36a and 36b and the yoke member 38 from the outside in the width direction. Has been. More specifically, as shown in FIGS. 6 and 7, the holding holder 42 is integrally provided with a pair of connection holding portions 44 and 44 and a connecting portion 46 that connects the pair of connection holding portions 44 and 44. ing.

  The connection holding portion 44 has a substantially rectangular block shape and includes an accommodation recess 48 that opens inward in the length direction and the width direction. Further, a small-diameter columnar locking protrusion 50 is integrally formed on the outer side in the length direction of the connection holding portion 44 in the lengthwise direction and protrudes inward in the width direction toward the strength member 12.

  The connecting portion 46 has a longitudinal plate shape extending in a substantially constant cross-sectional shape, and includes a yoke receiving groove 52 that opens to the inner surface in the width direction and continues in the length direction. In the present embodiment, a lightening hole 54 penetrating the bottom wall portion of the yoke housing groove 52 in the front-rear direction is formed, and the weight of the connecting portion 46 is reduced.

  The pair of connection holding portions 44 and 44 and the connecting portion 46 are integrally formed, and the pair of connection holding portions 44 and 44 are arranged on both sides so as to be spaced apart from each other in the length direction. The holding portions 44 and 44 are connected to each other by a connecting portion 46 to form a holding holder 42. The housing recesses 48, 48 of the pair of connection holding portions 44, 44 and the yoke housing groove 52 of the connecting portion 46 are connected to each other as an integral recess.

  The holding holder 42 is superposed on the magnets 36a and 36b and the yoke member 38 from the outside in the width direction. That is, one of the magnets 36a and 36b and one end of each of the yoke members 38 are inserted into the receiving recesses 48 and 48 of the pair of connection holding portions 44 and 44 in the holding holder 42, while the connecting portion An intermediate portion of the yoke member 38 is inserted into the yoke receiving groove 52 of 46. In the present embodiment, the magnets 36 a and 36 b and the yoke member 38 are fitted in the receiving recesses 48 and 48 of the holding holder 42 and the yoke receiving groove 52 of the connecting portion 46, so that they cannot be relatively displaced relative to the holding holder 42. Is attached. Thus, the outer sides in the width direction and both sides in the thickness direction of the magnets 36a and 36b and the yoke member 38 are covered with the holding holder 42, and the magnets 36a and 36b and the yoke member 38 are covered by the pair of connection holding portions 44 and 44. They are positioned mutually and are in a magnetically connected state. In the present embodiment, the magnets 36 a and 36 b and the yoke member 38 are held by the holding holder 42 in a superposed state in contact with each other.

  Further, the magnets 36 a and 36 b are fixed to the strength member 12, whereby the holding holder 42 is arranged outward in the width direction of the strength member 12, and the locking projection 50 of the holding holder 42 is locked to the strength member 12. It is inserted into the hole 32. The locking projection 50 of the holding holder 42 has a smaller diameter than the locking hole 32 of the strength member 12, and each locking projection 50 of the pair of holding holders 42, 42 in the front and rear in the width direction locks the strength member 12. The holes 32 are inserted with gaps from one side in the width direction. As a result, the holding holder 42 is allowed to be displaced relative to the strength member 12 by the displacement of the locking protrusion 50 in the locking hole 32 in the direction orthogonal to the insertion direction of the locking protrusion 50 into the locking hole 32. In addition, the relative displacement amount with respect to the strength member 12 is limited by the contact and locking of the locking protrusion 50 with respect to the inner peripheral surface of the locking hole 32.

  Further, the holding holder 42 is prevented from being detached from the strength member 12 outward in the width direction by the fixing member 56. The fixing member 56 includes a first clamping member 58 and a second clamping member 60.

  The first clamping member 58 is made of a non-magnetic material such as austenitic stainless steel, and extends in the thickness direction (up and down in FIG. 4) opposite to each other in the width direction (up and down in FIG. 3). The restricting portions 62, 62 are integrally connected to each other by a first element clamping portion 64 extending in the width direction at the upper end. As shown in FIG. 7, a pair of bolt holes 66, 66 are formed through the first element clamping portion 64 at a predetermined distance in the front-rear direction.

  The second clamping member 60 is made of a nonmagnetic material like the first clamping member 58, and a pair of nut portions 68, 68 extending in the thickness direction extend in the width direction at the lower end. The holding unit 70 has a structure integrally connected to each other. Further, between the pair of nut portions 68, 68 in the second clamping member 60, a fitting concave groove 72 that opens upward (upward in FIG. 5) and extends in the length direction (right and left in FIG. 6). Is formed. Further, screw holes 74 extending in the thickness direction are formed in the nut portions 68, 68 of the second clamping member 60, respectively.

  Then, the strength member 12 is fitted into the fitting concave groove 72 of the second clamping member 60. The pair of nut portions 68, 68 of the second clamping member 60 are inserted between the strength member 12 and the yoke member 38 and between the magnets 36a, 36b in each one of the width directions of the strength member 12. The strength member 12 is disposed outside the deformable portion 28 in the length direction. The second clamping member 60 may be fitted non-adhering to the strength member 12 or may be fixed to the strength member 12 by means such as adhesion.

  Further, the central portion of the first element sandwiching portion 64 is superimposed on the ends of the strength member 12 and the power generating element 14 from above, and the portions where the bolt holes 66 and 66 are formed in the first element sandwiching portion 64 are formed. The second clamping member 60 is superposed on the pair of nut portions 68, 68 from above. Then, mounting screws 76, 76 inserted into the bolt holes 66, 66 of the first clamping member 58 are screwed into screw holes 74, 74 formed in the nut portions 68, 68 of the second clamping member 60. As a result, the first clamping member 58 and the second clamping member 60 are fixed to each other to form the fixing member 56.

  In the present embodiment, the pair of fixing members 56 and 56 are provided at a predetermined distance in the length direction of the strength member 12, and one fixing member 56 is attached to the attachment portion 24, while the other A fixing member 56 is attached to the mass portion 26. The both end portions of the power generation element 14 and the strength member 12 are respectively between the opposing surfaces of the first element clamping portion 64 of the first clamping member 58 and the second element clamping portion 70 of the second clamping member 60. Thus, the power generating element 14 is fixed to the strength member 12 by being clamped up and down by the fastening force of the mounting screw 76.

  Further, the first clamping member 58 is fixed to the strength member 12, whereby the restricting portions 62 and 62 of the first clamping member 58 are positioned with respect to the strength member 12. The connecting portion 46 of the holding holder 42 comes into contact with the restricting portions 62 of the fixing members 56, 56, so that the holding holder 42 is limited in the amount of relative displacement outward in the width direction with respect to the strength member 12. The displacement limiting means is constituted by a fixing member 56 provided with restricting portions 62, 62. In the present embodiment, the first clamping member 58 of the fixing member 56 includes the restriction portions 62 on both sides in the width direction, the strength member 12 and the power generation element 14, the yoke members 38 and 38, and the holding holders 42 and 42. The restricting portions 62 and 62 are disposed to face the connecting portion 46 of the holding holder 42 on the outer side in the width direction opposite to the strength member 12. As a result, the holding holders 42 on both sides in the width direction are limited in relative displacement with respect to the strength member 12 by the restricting portions 62 of the fixing member 56 (see FIGS. 6 and 8).

  The holding member 42 is prevented from dropping from the strength member 12 by the fixing member 56, and the magnets 36 a and 36 b and the yoke member 38 disposed between the holding holder 42 and the strength member 12 are held by the holding holder 42. Thus, the magnetic member is held in a magnetically connected state with respect to the strength member 12. In addition, a pair of holding holders 42 and 42 are arranged on each side in the width direction of the strength member 12, and the pair of holding holders 42 and 42 allows a pair of front and rear magnets 36 a and 36 b and a yoke member 38 to be formed. The strength member 12 is held in a magnetically connected state. The magnetic connection state includes not only a case where they are connected in contact with each other but also a state where they are spaced apart with a gap that allows the closed magnetic path 40 to be effectively maintained.

  Furthermore, the distance between the opposing surfaces of the strength member 12 and the restricting portion 62 is made larger than the width direction dimension of the connection holding portion 44 in the holding holder 42, and the relative displacement in the width direction of the holding holder 42 with respect to the strength member 12 is reduced. Further, it is allowed between the opposing surfaces of the strength member 12 and the restricting portion 62. In particular, the relative displacement amount (t) in the width direction with respect to the strength member 12 in which the holding holder 42 is allowed is smaller than the protruding dimension (l) of the locking projection 50 as shown in FIG. Even when the holder 42 is relatively displaced outward in the width direction with respect to the strength member 12, the locking protrusion 50 is held in the inserted state into the locking hole 32.

  When the vibration power generation apparatus 10 having such a structure is attached to the vibration member 20 shown in FIG. 5 and vibration is input in the thickness direction of the strength member 12, the strength member 12 is thin in the thickness direction. It is elastically deformed at the formation portion (deformed portion 28) of the recessed groove 22, and a compressive strain or a tensile strain in the length direction is generated in the power generating element 14. As a result, the magnetic permeability of the power generating element 14 formed of a magnetostrictive material changes due to the inverse magnetostrictive effect (the effect of changing the magnetic permeability due to strain), and the magnetic flux penetrating the coil 34 changes. A voltage (inductive electromotive force) due to induction is generated and used for charging a storage battery connected to the coil 34 or operating an electric device.

  In the present embodiment, the bending rigidity of the power generation element 14 is smaller than the minimum bending rigidity in the deformed portion 28 of the strength member 12, and the neutral axis in the bending deformation is biased toward the strength member 12 than the power generation element 14. Is set. As a result, the influence of the strength member 12 is dominant on the bending deformation characteristics, and the compression / tensile stress on the power generation element 14 is more efficiently generated.

  Here, in the vibration power generation apparatus 10, the yoke member 38 is attached to the strength member 12 by the holding holder 42 and the fixing member 56 so as to be relatively displaceable. Thereby, the elastic deformation in the deformed portion 28 of the strength member 12 is effectively generated without being constrained by the yoke member 38, and the distortion of the power generation element 14 is efficiently generated, so that the power generation efficiency is improved. Is planned.

  Moreover, since not only the yoke member 38 but also the holding holder 42 is allowed to be displaced relative to the strength member 12, the connecting portion 46 of the holding holder 42 does not hinder the deformation of the strength member 12, and the strength member 12. The power generation efficiency is improved by the efficient deformation of the above. In the present embodiment, since the holding holder 42 has a structure in which the pair of connection holding portions 44 and 44 are connected to each other by the connecting portion 46, both end portions of the magnets 36 a and 36 b and the yoke member 38 on both sides in the length direction. Can be held in a magnetically connected state with a small number of parts with respect to the strength member 12.

  Further, since the holding holder 42 is attached to the strength member 12 in a state in which relative displacement with respect to the strength member 12 is allowed by the fixing member 56, the magnets 36a and 36b and the yoke member 38 have strength. The magnetically connected state with respect to the member 12 is stably maintained. Therefore, the closed magnetic path 40 including the magnets 36a and 36b, the yoke member 38, the strength member 12 and the power generation element 14 is stably maintained even when vibration is input, and the target power generation performance is stabilized. Can be obtained.

  In particular, the distance (t) between the opposing surfaces of the restricting portion 62 of the fixing member 56 and the holding holder 42 is set to be smaller than the protruding length (l) of the locking projection 50 in the holding holder 42. The stop protrusion 50 is prevented from coming off from the locking hole 32 by the contact between the restricting portion 62 and the holding holder 42. Thereby, the mechanical locking of the locking protrusion 50 and the locking hole 32 prevents the holding holder 42 from dropping from the strength member 12 with high reliability.

  Further, in the present embodiment, the relative displacement amount in the width direction of the holding holders 42, 42 arranged on both sides in the width direction with respect to the strength member 12 is provided in the first clamping member 58 of the fixing member 56. It is restricted by the pair of restricting portions 62 and 62. Therefore, the amount of relative displacement of the holding holders 42 and 42 with respect to the strength member 12 is limited by a simple structure with a small number of parts, and the holding holders 42 and 42 can be prevented from falling off the strength member 12.

  In addition, the fixing member 56 that holds the holding holder 42 against the strength member 12 so as not to fall off is configured to include a first clamping member 58 and a second clamping member 60, and the power generation element 14 is the first The sandwiching member 58 and the strength member 12 are supported by being sandwiched between the overlapping surfaces. Thereby, it is not necessary to provide the power generation element 14 with a mounting structure such as a screw hole, and the shape and size of the power generation element 14 are set with a large degree of freedom without being limited by the mounting structure to the strength member 12. It is possible. Moreover, since the power generation element 14 is sandwiched and supported by the overlapping surface of the first clamping member 58 and the strength member 12, the mounting state of the power generation element 14 with respect to the strength member 12 is stabilized, and the strength of the power generation element 14 is increased. It is possible to prevent the member 12 from dropping off or being displaced.

  Further, since the holding holder 42 is formed of synthetic resin, the weight can be reduced and the target shape can be set with a large degree of freedom. In addition, in this embodiment, since the lightening hole 54 is formed through the connecting portion 46 of the holding holder 42, the weight can be further reduced, and the deformation rigidity of the connecting portion 46 can be reduced. The reinforcement of the strength member 12 by 46 is prevented.

  10 to 13 show a magnetostrictive vibration power generation apparatus 80 as a second embodiment of the present invention. In the vibration power generator 80, the magnets 36 a and 36 b and the yoke member 38 are held in a magnetically connected state with respect to the strength member 12 by the holding holder 82. In addition, about the member and site | part substantially the same as 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol as 1st embodiment.

  More specifically, as shown in FIG. 14, the holding holder 82 has a structure in which a displacement limiting portion 84 is integrally formed with the connection holding portion 44. The displacement limiting portion 84 protrudes inward in the length direction from the outer end portion in the width direction of the connection holding portion 44 with a substantially constant saddle-shaped cross section, and a pair of upper and lower portions facing each other in the thickness direction is provided. .

  The four holding holders 82, 82, 82, and 82 hold the magnet 36 and the yoke member 38 in a magnetically connected state with respect to the strength member 12 in a non-detachable manner, and are relatively displaced. Is acceptable. More specifically, in the holding holder 82, the connection holding portion 44 is put on the end portion of the yoke member 38 and the magnet 36, and the displacement limiting portion 84 is a restriction on the first holding member 58 in the fixing member 56. The portion 62 is disposed to face the inner side in the width direction with a predetermined distance. Further, the protruding length of the locking projection 50 of the connection holding portion 44 inserted into the locking hole 32 of the strength member 12 is made larger than the distance between the opposing surfaces in the width direction of the displacement limiting portion 84 and the regulating portion 62. ing. Then, a displacement limiting means for limiting the amount of relative displacement of the holding holder 82 in the width direction outward with respect to the strength member 12 is configured by the contact of the displacement limiting portion 84 with the restricting portion 62, and the strength member 12 of the holding holder 82. The withdrawal from the is prevented. As a result, the magnet 36 and the yoke member 38 are held in a magnetically connected state with respect to the strength member 12 by the holding holder 82.

  The holding holders 82 are respectively attached to both ends in the longitudinal direction of the pair of front and rear magnets 36a and 36b and the yoke member 38 overlapped therewith, and four independent holding holders 82, 82, 82 and 82 are provided. Is provided. In short, the holding holders 82, 82, 82, 82 of the present embodiment have a structure in which the central portion of the connecting portion 46 is removed from the pair of front and rear holding holders 82, 82 of the first embodiment.

  Also in the vibration power generation apparatus 80 having the structure according to this embodiment, the reinforcement of the strength member 12 by the yoke member 38 is avoided as in the first embodiment, so that the deformation of the strength member 12 is effective. The power generation efficiency is improved. Furthermore, since the magnets 36a and 36b and the yoke member 38 are stably maintained in a magnetically connected state with respect to the strength member 12, the target power generation performance can be stably obtained.

  Moreover, according to the vibration power generation device 80 of the present embodiment, since the four holding holders 82, 82, 82, 82 are formed independently of each other, the holding holder 82 adversely affects the deformation of the strength member 12. Without any fear, the deformation of the strength member 12 is effectively caused to improve the power generation efficiency.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the connecting portion 46 of the holding holder 82 is not necessarily limited to being integrally formed of the same material as the connection holding portion 44. Specifically, for example, the connecting portion 46 may be formed of a flexible elastomer, and relative displacement between the pair of connection holding portions 44 and 44 may be allowed by deformation of the connecting portion 46.

  Further, the holding holder may be fixed to the strength member 12 and the allowable amount of relative displacement with respect to the strength member 12 may be substantially zero. In that case, for example, the holding recess 48 and the yoke receiving groove 52 of the holding holder are made larger than the outer shape of the magnet 36 and the yoke member 38, so that the magnet 36 and the yoke member 38 are accommodated in the receiving recess 48 and the yoke receiving space. By being accommodated in the groove 52 with a gap, relative displacement with respect to the holding holder is allowed. Further, any one end of the yoke member 38 is fixed to the strength member 12 so as not to be relatively displaced, and any other end of the yoke member 38 can be relatively displaced to the strength member 12 by the holding holder 42. In this case, the restraint by the yoke member 38 is suppressed, and the deformation of the strength member 12 is effectively caused at a predetermined resonance frequency.

  Moreover, in the said embodiment, although the magnet 36, the yoke member 38, and the holding holder 82 were provided in the width direction both sides of the intensity | strength member 12, you may provide only in either one side of the width direction. Furthermore, the magnets 36 do not necessarily have to be provided on both sides of the strength member 12 in the length direction, and may be provided on only one side in the length direction.

  Further, the magnet 36, the yoke member 38, and the holding holder 82 are preferably arranged in parallel with the strength member 12 in the width direction that is orthogonal to the main vibration input direction. For example, the strength member 12 is disposed in the main vibration input direction. The strength members 12 may be arranged above and below in the thickness direction so as to be aligned.

  The specific shapes of the strength member 12, the magnet 36, the yoke member 38, etc. are merely examples, and are not particularly limited. Specifically, for example, the groove 22 is not essential in the strength member 12.

  Also, the first clamping member 58 and the second clamping member 60 can be fixed to each other by means other than bolt fixing (adhesion, welding, etc.). The second clamping members 58 and 60 can also be suitably employed.

10, 80: Magnetostrictive vibration power generator, 12: Strength member, 14: Power generation element, 20: Vibration member, 32: Locking hole, 34: Coil, 36: Magnet, 38: Yoke member, 40: Closed magnetic circuit, 42 , 82: holding holder, 44: connection holding part, 46: coupling part, 50: locking projection, 56: fixing member, 58: first clamping member, 60: second clamping member, 62: regulating part, 72 : Fitting groove

Claims (7)

A longitudinal strength member formed of a ferromagnetic material and having one end fixed to the vibration member is provided, and a power generation element formed of a magnetostrictive material is attached to the strength member in parallel. A yoke member magnetically connected to the element is disposed, a magnet for applying a bias magnetic field to a closed magnetic path including the power generation element and the yoke member is provided, and on the closed magnetic path In the magnetostrictive vibration power generation apparatus, the coil is wound and disposed, and a voltage is generated in the coil based on a change in magnetic permeability due to distortion of the power generation element.
A holding holder for holding the magnet and the yoke member magnetically connected to the strength member while allowing relative displacement of the yoke member relative to the strength member;
Displacement limiting means for limiting a relative displacement amount of the holding holder with respect to the strength member by a fixing member that sandwiches at least one end of the power generation element in a state of being overlapped with the strength member and is fixed to the strength member. A magnetostrictive vibration power generator characterized in that A locking projection is formed on one of the strength member and the holding holder,
A locking hole is formed in either the strength member or the holding holder,
The amount of relative displacement of the holding holder with respect to the strength member is limited by inserting the locking protrusion into the locking hole,
The magnetostrictive vibration power generator according to claim 1, wherein the locking projection has a diameter smaller than that of the locking hole, and relative displacement of the holding holder with respect to the strength member is allowed.   The fixing member includes a restricting portion facing the holding member on the opposite side of the strength member, and relative displacement of the holding holder with respect to the strength member is allowed in a facing direction of the restricting portion and the strength member. The magnetostrictive vibration power generator according to claim 1, wherein a relative displacement amount of the holding holder with respect to the strength member is limited by contact between the restricting portion and the holding holder.   The fixing member has a structure in which a first sandwiching member and a second sandwiching member that sandwich the strength member and the end of the power generation element are combined, and the first sandwiching member has the restricting portion. In addition, the second holding member includes a fitting groove that is externally fitted to the strength member, and a side wall portion of the fitting groove in the second clamping member fitted to the strength member is provided. By being fixed to the first clamping member, the power generating element is fixed to the strength member, and the first clamping member is fixed to the strength member so that the restricting portion is against the strength member. The magnetostrictive vibration power generator according to claim 3, wherein the magnetostrictive vibration power generator is positioned.   The magnets are arranged on both sides of the strength member in the length direction, the yoke member extends over the magnets, and the holding holder attaches the magnet and the yoke member to the strength member. 5. A pair of connection holding portions for holding in a general connection state are provided, and the pair of connection holding portions are connected to each other by a longitudinal connection portion extending in parallel with the strength member. The magnetostrictive vibration power generation apparatus according to any one of the above.   The magnets are respectively disposed on both sides of the strength member in the width direction, and the magnets are held in a magnetically connected state with respect to the strength member by the holding holder, and each magnet is held. The magnetostrictive vibration power generator according to any one of claims 1 to 5, wherein a relative displacement amount of the holding holder is limited by the fixing member extending across the strength member in the width direction.   The magnetostrictive vibration power generator according to any one of claims 1 to 6, wherein the holding holder is made of resin.