JP2015091204A - Power generation element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation element that can make a control for factors relating to extraction loads of a magnetostrictive rod and a rigid rod unnecessary, and firmly fasten the magnetostrictive rod and the rigid rod to a holding member.SOLUTION: Engaging parts 55 are provided in an inner wall of a hole part 51 formed in a holding member 50. The engaging parts 55 are engaged with engaged parts 12e formed in a magnetostrictive rod 10 and in a rigid rod 20 and restricts movement of the magnetostrictive rod 10 and the rigid rod 20 toward a center in a shaft direction relative to the holding member 50. Between the magnetostrictive rod 10 and the rigid rod 20 is inserted an interval holding part 30 so as to prevent the engaged parts 12a from being disengaged from the engaging parts 55. This can make a control for factors relating to extraction loads toward the center in the shaft direction of the magnetostrictive rod 10 and the rigid rod 20 unnecessary and firmly fasten the magnetostrictive rod 10 and the rigid rod 20 to the holding member 50.

Description

  The present invention relates to a power generation element that performs vibration power generation using the inverse magnetostriction effect of a magnetostrictive material, and in particular, it is possible to eliminate management of factors relating to the unloading load of the magnetostrictive rod and the rigid rod, and to use the magnetostrictive rod and the rigid rod as a holding member. The present invention relates to a power generating element that can be firmly fixed.

  Conventionally, there is a power generation element that performs vibration power generation using the inverse magnetostriction effect of a magnetostrictive material (Patent Document 1). Patent Document 1 discloses a power generating element in which a pair of magnetostrictive rods (rigid rods) are arranged in parallel, and both ends of the pair of magnetostrictive rods are respectively joined to a connecting yoke (holding member). In order to join a magnetostrictive rod (rigid rod) to the holding member, the magnetostrictive rod is inserted into the groove of the holding member formed with two grooves, and then the holding member is compressed so that the groove width is reduced. The member is deformed and the inner wall of the groove of the holding member is pressed against the surface of the magnetostrictive rod. Thereby, the pull-out load to the axial direction center side of the magnetostrictive rod with respect to the holding member is ensured.

Japanese Patent No. 4905820 (particularly FIGS. 2C to 2F)

  However, in the above-described conventional power generation element, the axial direction of the magnetostrictive rod and the rigid rod to the axial center side depends on factors such as the cross-sectional area of the holding member to be compressed and deformed, the width of the groove, the surface roughness of the groove and the magnetostrictive rod (rigid rod) Since the unloading load fluctuates, in order to firmly fix the magnetostrictive rod and the rigid rod to the holding member, it is necessary to manage factors related to the unloading load in the power generation element manufacturing process.

  The present invention has been made in order to solve the above-described problems, and it is possible to eliminate the management of factors relating to the unloading load of the magnetostrictive rod and the rigid rod toward the center in the axial direction, and to use the magnetostrictive rod and the rigid rod as a holding member. It aims at providing the power generating element which can be fixed firmly.

Means for Solving the Problems and Effects of the Invention

  According to the power generating element of the first aspect, the magnetostrictive rod configured in a rod shape from the magnetostrictive material is provided in the coil formed by winding the conducting wire. A rigid rod configured in a rod shape from a magnetic material is disposed to face the magnetostrictive rod, and a magnetic loop is formed between the rigid rod and the magnetostrictive rod. Both ends in the axial direction of the rigid rod and the magnetostrictive rod are respectively held by a pair of holding members, and the magnetostrictive rod and the rigid rod extend or contract in the axial direction by relative movement of the pair of holding members to generate electric power.

  In the magnetostrictive rod and the rigid rod, the engaged portions are protruded or recessed in the respective axial ends toward the direction intersecting the axial direction of the magnetostrictive rod and the rigid rod. The holding member has a hole recessed in the axial direction of the magnetostrictive rod and the rigid rod, and the hole has a pair of first opposing surfaces and a pair of second opposing surfaces whose inner walls face each other. An engaging portion is formed on at least one of the first facing surface and the second facing surface. The engaging portion engages with an engaged portion formed at the axial ends of the magnetostrictive rod and the rigid rod, and restricts the movement of the magnetostrictive rod and the rigid rod toward the axial center with respect to the holding member. Since the pair of interval holding portions are inserted between the opposing ends of the magnetostrictive rod and the rigid rod in the axial direction, it is possible to prevent the engaged portion from being disengaged from the engaging portion. As a result, it is possible to eliminate the need for management of factors relating to the axial load of the magnetostrictive rod and the rigid rod in the axial direction and to firmly fix the magnetostrictive rod and the rigid rod to the holding member.

  According to the power generating element of the second aspect, since the pair of permanent magnets are inserted between the opposite ends of the magnetostrictive rod and the rigid rod in the axial direction with the magnetic poles different from each other, the magnetostrictive rod, the rigid rod, and the permanent rod are inserted. A magnetic loop can be formed by a magnet. Since the permanent magnet is juxtaposed with the interval holding portion along the axial direction of the magnetostrictive rod and the rigid rod, in addition to the effect of the first aspect, there is an effect that the power generating element can be miniaturized.

  According to the power generation element of the third aspect, since the hole is formed through the holding member along the axial direction of the magnetostrictive rod and the rigid rod, there is an effect that the assembly operation of the power generation element can be easily performed. is there. That is, when the hole is not formed through the holding member, it is necessary to insert a gap holding portion between the magnetostrictive rod and the rigid rod facing each other from the axial center side of the magnetostrictive rod and the rigid rod. In that case, the interval holding portion interferes with the axial center side of the magnetostrictive rod or the rigid rod, and is difficult to insert. Therefore, it is possible to prevent the interval holding portion from interfering with the axially central side of the magnetostrictive rod or the rigid rod. Therefore, in addition to the effect of the first or second aspect, there is an effect that it is possible to easily perform the assembly work of the power generating element that is assembled by inserting the interval holding portion between the magnetostrictive rod and the rigid rod.

  According to the power generating element of the fourth aspect, since the movement restricting portion that restricts the axial movement of the magnetostrictive rod and the rigid rod with respect to the holding member is provided, in addition to the effect of the third aspect, the holding member In contrast, the magnetostrictive rod and the rigid rod can be prevented from moving outward in the axial direction, and the magnetostrictive rod and the rigid rod can be firmly fixed to the holding member.

It is a perspective view of the electric power generation element in 1st Embodiment of this invention. It is an exploded three-dimensional view of a power generation element. (A) is a top view of a magnetostrictive rod, (b) is a side view of a magnetostrictive rod. (A) is a front view of a holding member, (b) is a cross-sectional view of the holding member taken along line IVb-IVb in FIG. 4 (a), and (c) is taken along line IVc-IVc in FIG. 4 (a). It is sectional drawing of a holding member. (A) is a front view of a power generation element, (b) is a cross-sectional view of the power generation element taken along line Vb-Vb in FIG. 5 (a), and (c) is taken along line Vc-Vc in FIG. 5 (a). It is sectional drawing of an electric power generation element. (A) is a top view of the magnetostriction rod of the electric power generating element in 2nd Embodiment, (b) is a side view of a magnetostriction rod. (A) is a front view of a holding member, (b) is a cross-sectional view of the holding member taken along line VIIb-VIIb in FIG. 7 (a), and (c) is taken along line VIIc-VIIc in FIG. 7 (a). It is sectional drawing of a holding member. (A) is a top view of the magnetostrictive rod of the electric power generating element in 3rd Embodiment, (b) is a side view of a magnetostrictive rod. (A) is a front view of a holding member, (b) is a cross-sectional view of the holding member taken along line IXb-IXb in FIG. 9 (a), and (c) is taken along line IXc-IXc in FIG. 9 (a). It is sectional drawing of a holding member. (A) is a top view of the magnetostrictive rod of the electric power generating element in 4th Embodiment, (b) is a side view of a magnetostrictive rod. (A) is a front view of a holding member, (b) is a cross-sectional view of the holding member taken along line XIb-XIb in FIG. 11 (a), and (c) is taken along line XIc-XIc in FIG. 11 (a). It is sectional drawing of a holding member. (A) is a top view of the magnetostrictive rod of the electric power generating element in 5th Embodiment, (b) is a side view of a magnetostrictive rod. (A) is a front view of a holding member, (b) is a sectional view of the holding member along line XIIIb-XIIIb in FIG. 13 (a), and (c) is along line XIIIc-XIIIc in FIG. 13 (a). It is sectional drawing of a holding member. (A) is a front view of the holding member of the electric power generation element in 6th Embodiment, (b) is sectional drawing of the holding member in the XIVb-XIVb line | wire of Fig.14 (a), (c) is FIG.14. It is sectional drawing of the holding member in the XIVc-XIVc line | wire of (a). (A) is a front view of the power generation element viewed from the outside in the axial direction, and (b) is a rear view of the power generation element viewed from the center side in the axial direction.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of the power generation element 1 according to the first embodiment of the present invention, and FIG. 2 is an exploded view of the power generation element 1. 1 illustrates a state in which the movement restricting portion 60 attached to the end surface of the holding member 50 is removed, and in FIG. 2, illustration of one end side in the axial direction of the power generating element 1 is omitted.

  As shown in FIG. 1, the power generating element 1 includes a magnetostrictive rod 10 formed of a magnetostrictive material (a kind of magnetic material) and a rigid rod 20 formed of a magnetic material. And an interval holding portion 30 sandwiched between the opposing ends of the magnetostrictive rod 10 and the rigid rod 20 on one end side and the other end side in the axial direction, and one axial end side and the other end side of the magnetostrictive rod 10 and the rigid rod 20 respectively. And a pair of holding members 50 attached to one end side and the other end side of the magnetostrictive rod 10 and the rigid rod 20 in the axial direction.

  For example, the power generating element 1 is installed in a state where one of the pair of holding members 50 is fixed to the vibrating body and the other is a free end, and the magnetostrictive rod 10 and the rigid rod are accompanied by the vibration of the vibrating body. The other holding member 50 is used by pendulum movement (free vibration) in the direction perpendicular to the 20 axis. In this case, axial expansion and contraction occurs in the magnetostrictive rod 10 due to bending deformation accompanying the pendulum motion, so that the magnetic flux density changes in a direction parallel to the axial direction of the magnetostrictive rod 10 and current is generated in the coil. Electricity is generated at

  The magnetostrictive rod 10 and the rigid rod 20 are formed in a long plate shape having a rectangular right-angle cross section having a large width with respect to the thickness. The magnetostrictive rod 10 and the rigid rod 20 are formed in the same shape (dimension) with each other, and are arranged in parallel so that planes having a large area (that is, planes including the width) face each other. The rigid rod 20 is made of a magnetic material having a magnetostriction effect lower than that of the magnetostrictive rod 10. In the present embodiment, the magnetostrictive rod 10 is made of an iron gallium alloy, and the rigid rod 20 is made of a steel material. The magnetostrictive rod 10 is installed in a coil (not shown) wound with a wire (conductive wire) made of copper wire. A gap is provided between the coil and the magnetostrictive rod 10.

  As shown in FIG. 2, the interval holding unit 30 is a member for holding the interval between the magnetostrictive rod 10 and the rigid rod 20 facing each other, and is provided on one end side and the other end side in the axial direction of the magnetostrictive rod 10 and the rigid rod 20. It is inserted between the opposites. The interval holding unit 30 is made of a nonmagnetic material (in this embodiment, an aluminum alloy), has a rectangular axial cross section, and has a thickness between the axial ends of the magnetostrictive rod 10 and the rigid rod 20 ( (Opposite spacing). The tip 31 located on the axial center side of the magnetostrictive rod 10 and the rigid rod 20 is formed in a round shape with the corners cut off.

  The permanent magnet 40 is a member for applying a bias magnetic field to the magnetostrictive rod 10. The permanent magnet 40 is inserted between the opposing ends of the magnetostrictive rod 10 and the rigid rod 20 on one end side and the other end side in the axial direction. It is installed side by side. The permanent magnets 40 are each formed in a bar shape having a rectangular cross section, and the thickness thereof is the interval (opposite interval) between the axial ends of the magnetostrictive rod 10 and the rigid rod 20. The pair of permanent magnets 40 are disposed at opposite axial ends of the magnetostrictive rod 10 and the rigid rod 20 with different magnetic poles. Thereby, a magnetic loop is formed by the magnetostrictive rod 10, the rigid rod 20 and the permanent magnet 40, and a bias magnetic field due to the magnetomotive force of the permanent magnet 40 is applied to the magnetostrictive rod 10. As a result, the magnetization easy direction (the direction of magnetization or the direction in which magnetization is likely to occur) of the magnetostrictive rod 10 is set to the axial direction (longitudinal direction) of the magnetostrictive rod 10.

  The holding member 50 is a member for holding the state in which the gap holding portion 30 and the permanent magnet 40 are sandwiched between the opposing ends of the magnetostrictive rod 10 and the rigid rod 20 on one end side and the other end side in the axial direction. It is made of a material (in this embodiment, an aluminum alloy). The holding member 50 is formed in the shape of a rectangular column whose outer shape in the axial direction of the magnetostrictive rod 10 and the rigid rod 20 is formed, and a hole 51 is recessed in the axial direction of the magnetostrictive rod 10 and the rigid rod 20. In the present embodiment, the hole 51 is formed so as to penetrate along the axial direction. The hole 51 is a space in which the axial ends of the magnetostrictive rod 10 and the rigid rod 20, the interval holding unit 30, and the permanent magnet 40 are accommodated, and has a rectangular axis-perpendicular cross section. Bolt holes 50 a are formed at two locations across the hole 51 on the front surface (end surface) of the holding member 50.

  The movement restricting portion 60 is a member that is fixed to the front surface (end surface) of the holding member 50 so as to close the hole portion 51, and is configured by a rectangular plate-like body. The movement restricting portion 60 is made of a non-magnetic material (in this embodiment, an aluminum alloy), and a bolt insertion hole 60 a penetrating in the thickness direction corresponds to the bolt hole 50 a formed in the holding member 50. Is formed. The movement restricting part 60 is pressed against the end face of the holding member 50 by pressing the movement restricting part 60 against the end face of the holding member 50, inserting a bolt (not shown) into the bolt insertion hole 60a and screwing it into the bolt hole 50a. Fixed.

  Next, the magnetostrictive rod 10 and the rigid rod 20 will be described with reference to FIG. FIG. 3A is a plan view of the magnetostrictive rod 10, and FIG. 3B is a side view of the magnetostrictive rod 10. Since the magnetostrictive rod 10 and the rigid rod 20 are formed in the same shape (dimension), the magnetostrictive rod 10 is shown in FIG. 3, and the illustration of the rigid rod 20 is omitted. As shown in FIGS. 3 (a) and 3 (b), the magnetostrictive rod 10 has the same width (dimension in the left-right direction in FIG. 3 (a)) and thickness in the axial direction (FIG. 3 (a) vertical direction). The main body 11 having a rectangular right-angle cross section formed in (FIG. 3 (b) horizontal dimension) and the axis at a predetermined length at both axial ends of the main body 11 (FIG. 3 (a) vertical dimension). And a convex portion 12 having a rectangular axis-perpendicular section projecting in a perpendicular direction (width direction). The convex portion 12 is set to the same thickness as that of the main body portion 11. The end surface of the convex portion 12 on the center side in the axial direction constitutes an engaged portion 12 a that is convexly provided in a step shape in the width direction with respect to the main body portion 11. The rigid rod 20 configured in the same manner as the magnetostrictive rod 10 will be described below as the main body portion 21, the convex portion 22, and the engaged portion 22a.

  Next, the holding member 50 will be described with reference to FIG. 4A is a front view of the holding member 50, FIG. 4B is a cross-sectional view of the holding member 50 taken along line IVb-IVb in FIG. 4A, and FIG. 4C is FIG. It is sectional drawing of the holding member 50 in the IVc-IVc line | wire of a). As shown in FIG. 4A and FIG. 4B, the holding member 50 has a hole 51 formed therethrough along the axial direction (FIG. 4A). The hole 51 is a space in which the axial ends of the magnetostrictive rod 10 and the rigid rod 20 are accommodated, and includes a pair of first opposing surfaces 52a and 52b and a pair of second opposing surfaces 53a and 53b whose inner walls face each other. And has a rectangular axial cross section.

  The pair of first opposing surfaces 52a and 52b are provided on the end of the main body portion 21 and the lower surface of the convex portion 22 of the rigid rod 20, and the upper end of the main body portion 11 of the magnetostrictive rod 10 and the upper surface of the convex portion 12 (FIG. a) a plane on which the surface on the front side of the sheet) is in close contact. The pair of second facing surfaces 53a and 53b are planes on which the side surfaces of the main body portions 11 and 21 of the magnetostrictive rod 10 and the rigid rod 20 on the end side in the axial direction are in close contact. The pair of first opposing surfaces 52a and 52b and the pair of second opposing surfaces 53a and 53b are formed to be parallel to each other. The pair of first opposing surfaces 52a and 52b is set to have the same or smaller interval as the total thickness of the magnetostrictive rod 10, the rigid rod 20, the interval holding unit 30, or the permanent magnet 40.

  The pair of second facing surfaces 53a and 53b is set to have a width (a dimension in the left-right direction in FIG. 4B) slightly larger than the width of the main body portions 11 and 21 of the magnetostrictive rod 10 and the rigid rod 20. The concave portions 54 and 54 are concave pits connected to the second facing surfaces 53a and 53b, respectively, and are formed so that the bottom surfaces thereof are parallel to each other. The axial lengths of the bottom surfaces of the recesses 54 and 54 (the vertical direction in FIG. 4B) are set slightly larger than the axial lengths of the convex portions 12 and 22 of the magnetostrictive rod 10 and the rigid rod 20. The concave portions 54 and 54 are spaces in which the convex portions 12 and 22 of the magnetostrictive rod 10 and the rigid rod 20 are accommodated.

  The engaging portions 55 and 55 are stepped portions provided between the axially outer ends of the second facing surfaces 53a and 53b and the axially central ends of the concave portions 54 and 54, respectively. The magnetostrictive rod 10 and the rigid rod 20 accommodated in the portion 51 are engaged with the engaged portions 12a and 22a formed at the axial ends. When the engaging portions 55 and 55 are engaged with the engaged portions 12a and 22a, the movement of the magnetostrictive rod 10 and the rigid rod 20 toward the axially central side with respect to the holding member 50 is restricted.

  The length of the diagonal line of the cross section perpendicular to the axis surrounded by the first facing surfaces 52a and 52b and the second facing surfaces 53a and 53b is the width of the axial ends of the magnetostrictive rod 10 and the rigid rod 20 (main body portions 11 and 21). And the width of the convex portions 12 and 22). This is because the axial ends of the magnetostrictive rod 10 and the rigid rod 20 having the convex portions 12 and 22 can be inserted into the hole portion 51.

  Next, a method for assembling the power generation element 1 will be described with reference to FIG. 5A is a front view of the power generation element 1, FIG. 5B is a cross-sectional view of the power generation element 1 taken along the line Vb-Vb in FIG. 5A, and FIG. It is sectional drawing of the electric power generation element 1 in the Vc-Vc line | wire of a). The power generating element 1 is assembled by first inserting the magnetostrictive rod 10 into a coil (not shown) and inclining the axial ends of the magnetostrictive rod 10 and the rigid rod 20 in the diagonal direction of the hole 51 in the diagonal direction. However, it inserts into the hole 51 from the 2nd opposing surface 53a, 53b (refer FIG.4 (b)) side of the holding member 50, respectively.

  While engaging the engaged portions 12a and 22a of the magnetostrictive rod 10 and the rigid rod 20 with the engaging portions 55 and 55, as shown in FIG. 5A, the rigid rod 20 is attached to the first opposing surface 52a. 1 The magnetostrictive rod 10 is brought into close contact with the facing surface 52b. Next, as shown in FIG. 5 (c), a gap holding portion 30 is inserted from the tip 31 side between the magnetostrictive rod 10 and the rigid rod 20 facing each other from the outer side in the axial direction of the magnetostrictive rod 10 and the rigid rod 20, and the main body portion. The space | interval holding | maintenance part 30 is arrange | positioned in the accommodation space enclosed by 11 and 21 and 2nd opposing surface 53a, 53b (refer FIG.4 (b)). Since the tip 31 of the interval holding part 30 is formed in a round shape, it can be easily inserted between the magnetostrictive rod 10 and the rigid rod 20 facing each other.

  In addition, the space | interval holding | maintenance part 30 is a dimension (the main-body part 11 by the space | interval holding | maintenance part 30, and the dimension (FIG.5 (c) vertical direction dimension) at least contacting the main-body parts 11 and 21 of the magnetostriction rod 10 and the rigid rod 20). The pressure of 21 is set to a dimension equal to or greater than zero touch where the pressure is 0 or greater. If the distance holding portion 30 is dimensioned (width) that can be press-fitted into the second facing surfaces 53a and 53b, the distance holding portion 30 is fitted and held in the hole 51 regardless of the magnetostrictive rod 10 and the rigid rod 20. It is because it is made to do. Further, if the interval holding part 30 is at least in contact with the main body parts 11 and 21, it is possible to eliminate backlash in the vertical direction (perpendicular to the axis) of the magnetostrictive rod 10 and the rigid rod 20.

  Next, the permanent magnet 40 is inserted between the magnetostrictive rod 10 and the rigid rod 20 facing each other from the outside in the axial direction of the magnetostrictive rod 10 and the rigid rod 20, and arranged side by side on the axially outer side of the interval holding unit 30. Finally, the movement restricting portion 60 (see FIG. 1) is fixed to the end surface of the holding member 50, and the axial end surfaces of the magnetostrictive rod 10, the rigid rod 20 and the permanent magnet 40 are brought into contact with the movement restricting portion 60. As a result, movement of the magnetostrictive rod 10, the rigid rod 20, and the permanent magnet 40 toward the holding member 50 in the axial direction is restricted.

  The permanent magnet 40 is set so that the thickness (the vertical dimension in FIG. 5C) is smaller than the thickness of the interval holding unit 30. This is to prevent the permanent magnet from being damaged and stabilize power generation. That is, the interval holding part 30 and the permanent magnet 40 are arranged side by side in the axial direction between the opposite sides of the magnetostrictive rod 10 and the rigid rod 20, and the thickness of the interval holding part 30 is made larger than the thickness of the permanent magnet 40, thereby It can suppress that the permanent magnet 40 is pressed between 10 and the opposition of the rigid stick | rod 20. FIG. As a result, breakage of the permanent magnet that is a brittle material can be suppressed.

  Further, when the interval holding unit 30 and the permanent magnet 40 are juxtaposed in the axial direction between the opposing sides of the magnetostrictive rod 10 and the rigid rod 20, the interval holding unit 30 is arranged on the axial center side with respect to the permanent magnet 40, By making the thickness of the interval holding portion 30 larger than the thickness of the permanent magnet 40, the magnetostrictive rod 10 and the rigid rod 20 can be pendulum-moved (bend deformation) with the interval holding portion 30 as a fulcrum. Therefore, the power generation can be stabilized with the free lengths of the magnetostrictive rod 10 and the rigid rod 20 being constant regardless of the magnitude of relative movement of the pair of holding members 50 (state of vibration during power generation).

  In addition, when the permanent magnet 40 is disposed on the axially central side of the magnetostrictive rod 10 and the rigid rod 20 with respect to the interval holding unit 30, depending on the relative movement of the pair of holding members 50, the pendulum motion ( At the time of bending deformation, a mode in which the magnetostrictive rod 10 and the rigid rod 20 vibrate while repeatedly contacting or separating from the permanent magnet 40 is generated, and the free lengths of the magnetostrictive rod 10 and the rigid rod 20 are not constant and become indefinite. Therefore, power generation becomes unstable.

  According to the power generation element 1 described above, the engaging portion 55 formed on the holding member 50 engages with the engaged portions 12 and 22 formed on the axial ends of the magnetostrictive rod 10 and the rigid rod 20. The movement of the magnetostrictive rod 10 and the rigid rod 20 toward the axially central side with respect to the holding member 50 is restricted. Since the pair of spacing holding portions 30 are respectively inserted between the opposite ends of the magnetostrictive rod 10 and the rigid rod 20 in the axial direction, the magnetostrictive rod 10 and the rigid rod 20 are prevented from being inclined in the diagonal direction of the hole 51, and It can prevent that the engaging parts 12 and 22 remove | deviate from the engaging part 55. FIG. As a result, factors related to the axial load of the magnetostrictive rod 10 and the rigid rod 20 (the cross-sectional area of the holding member 50, the size of the hole 51, the surface roughness of the magnetostrictive rod 10 and the rigid rod 20, etc.) Management can be made unnecessary, and the magnetostrictive rod 10 and the rigid rod 20 can be firmly fixed to the holding member 50.

  In addition, by using the inner wall of the hole 51 formed in the holding member 50, a pair of first opposing surfaces 52a and 52b in which the upper and lower surfaces of the main body portions 11 and 21 of the magnetostrictive rod 10 and the rigid rod 20 are in close contact are provided. Since the engaging portion 55 is formed on the second opposing surfaces 53a and 53b that are formed and connected to the first opposing surfaces 52a and 52b, the holding member 50 can be easily manufactured. In addition, since the engaged portion 12 protrudes in the width direction of the axial ends of the main body portions 11 and 21 of the magnetostrictive rod 10 and the rigid rod 20, the magnetostrictive rod 10 and the rigid rod 20 can be easily manufactured. By engaging the engaged portions 12 and 22 formed at the axial ends of the magnetostrictive rod 10 and the rigid rod 20 with the engaging portion 55, the axial direction of the magnetostrictive rod 10 and the rigid rod 20 with respect to the holding member 50. Since the movement to the center side can be restricted, the power generating element 1 can be easily assembled. Therefore, the assembly workability of the power generation element 1 can be improved.

  In addition, since the pair of permanent magnets 40 are inserted between the opposite ends of the magnetostrictive rod 10 and the rigid rod 20 in the axial direction, the magnetic poles are inserted in different directions, so that the magnetostrictive rod 10, the rigid rod 20 and the permanent magnet 40 are magnetized. Loops can be formed. Since the permanent magnet 40 is arranged in parallel with the interval holding unit 30 along the axial direction of the magnetostrictive rod 10 and the rigid rod 20, the power generating element 1 can be reduced in size.

  Since the hole 51 is formed through the holding member 50 along the axial direction of the magnetostrictive rod 10 and the rigid rod 20, the assembly operation of the power generating element 1 can be performed easily. That is, when the hole 51 is not formed through the holding member 50, the gap holding portion 30 is inserted between the magnetostrictive rod 10 and the rigid rod 20 facing each other from the axial center side of the magnetostrictive rod 10 and the rigid rod 20. There must be. In that case, there exists a problem that the space | interval holding | maintenance part 30 interferes with the axial direction center side of the magnetostriction stick | rod 10 or the rigid stick | rod 20, and it is difficult to insert. On the other hand, since the interval holding portion 30 is inserted between the magnetostrictive rod 10 and the rigid rod 20 facing each other from the outside in the axial direction of the magnetostrictive rod 10 and the rigid rod 20, the interval holding portion 30 is used as the axis of the magnetostrictive rod 10 or the rigid rod 20. Interfering with the center of the direction can be prevented. Therefore, the assembly operation of the power generating element 1 can be performed easily.

  In addition, since the movement restricting portion 60 that restricts the axial movement of the magnetostrictive rod 10 and the rigid rod 20 with respect to the holding member 50 is fixed to the outside of the holding member 50 in the axial direction, the pendulum motion is repeatedly performed. Even in this case, the magnetostrictive rod 10 and the rigid rod 20 can be prevented from moving outward in the axial direction with respect to the holding member 50, and the magnetostrictive rod 10 and the rigid rod 20 can be firmly fixed to the holding member 50. Therefore, the durability of the power generating element 1 can be ensured. Further, since the coil is wound around the magnetostrictive rod 10 and the coil is not wound around the rigid rod 20, the number of parts can be reduced accordingly.

  Here, a pair of permanent magnets 40 are sandwiched between the magnetostrictive rod 10 and the rigid rod 20 opposite to each other, and a magnetic loop is formed by the magnetostrictive rod 10 and the rigid rod 20 and the pair of permanent magnets 40. In the structure, the direction of the magnetic field formed along the axial direction of the magnetostrictive rod 10 is opposite to the direction of the magnetic field formed along the axial direction of the rigid rod 20. Therefore, during the power generation, when the magnetostrictive rod 10 and the rigid rod 20 are expanded or contracted, the changes in the magnetic flux density in the direction parallel to the axial direction are reversed and cancel each other. Therefore, the change in magnetic flux density is reduced, resulting in a decrease in power generation efficiency.

  On the other hand, since the rigid rod 20 (that is, the one on which the coil is not wound) is made of a magnetic material having a magnetostriction effect lower than that of the magnetostrictive rod 10, the magnetostrictive rod 10 and the rigid rod 20 are expanded or contracted during power generation. In this case, the change in magnetic flux density in the direction parallel to the axial direction of the rigid rod 20 can be reduced. Therefore, it is possible to suppress the change in the magnetic flux density in the direction parallel to the axial direction in the magnetostrictive rod 10 due to the change in the magnetic flux density in the direction parallel to the axial direction in the rigid rod 20, so that it is necessary for power generation accordingly. The change in the magnetic flux density in the direction parallel to the axial direction in the magnetostrictive rod 10 can be ensured to improve the power generation efficiency.

  In addition, the rigid rod 20 does not need to be made of a magnetostrictive material having a high magnetostriction effect, and can be made of a general magnetic material. As a product cost can be reduced.

  The magnetostrictive rod 10 and the rigid rod 20 are formed in the shape of a long plate having a rectangular cross section perpendicular to the axis, and the planes including the long sides in the cross section are opposed to each other, and the planes including the long sides in the cross section are permanently opposed to each other. Since the magnet 40 is sandwiched, the area of the permanent magnet 40 facing the magnetostrictive rod 10 and the rigid rod 20 can be secured. Therefore, the bias magnetic field generated by the magnetomotive force of the permanent magnet 40 can be efficiently applied to the magnetostrictive rod 10 and the rigid rod 20, and the power generation efficiency can be improved accordingly.

  Further, since the permanent magnet 40 is held between the magnetostrictive rod 10 and the rigid rod 20 facing each other, it is possible to suppress the occurrence of slipping between the magnetostrictive rod 10 and the rigid rod 20 and the permanent magnet 40 during power generation. Energy loss due to resistance can be reduced. As a result, the power generation efficiency can be improved.

  In the power generation element 1, since the interval holding unit 30 and the holding member 50 are made of a nonmagnetic material, leakage and short circuit of the magnetic flux to the holding member 50 can be suppressed and concentrated on the magnetostrictive rod 10 and the rigid rod 20. it can. Therefore, the bias magnetic field generated by the magnetomotive force of the permanent magnet 40 can be efficiently applied to the magnetostrictive rod 10 and the rigid rod 20, and the power generation efficiency can be improved accordingly. Moreover, since the space | interval holding | maintenance part 30 and the holding member 50 are comprised from a nonmagnetic material, a highly tough material can be selected as a raw material of this member. Therefore, the deformability of the space | interval holding | maintenance part 30 and the holding member 50 can be ensured, and the reliability of holding | maintenance of the magnetostrictive rod 10 and the rigid rod 20 can be improved.

  Next, a second embodiment will be described with reference to FIGS. In 1st Embodiment, the case where the movement control part 60 which controls the movement to the axial direction outer side of the magnetostriction stick | rod 10 and the rigid stick | rod 20 was comprised as a member different from the holding member 50 was demonstrated. On the other hand, in the second embodiment, a case where the movement restricting portion 160 is formed integrally with the holding member 150 will be described. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 6A is a plan view of the magnetostrictive rod 110 of the power generating element in the second embodiment, and FIG. 6B is a side view of the magnetostrictive rod 110.

  6 (a) and 6 (b), the magnetostrictive rod 110 has the same width (FIG. 6 (a) left-right dimension) and thickness (FIG. 6 (b) left-right dimension) in the axial direction. ) And a convex portion projecting in a direction perpendicular to the axis (width direction) over a predetermined length (dimension in the vertical direction in FIG. 6A) of both ends in the axial direction of the main body portion 11. 112. The convex portion 112 is formed in a rectangular parallelepiped shape having the same thickness as the main body portion 11, and is projected at a position slightly separated from the axial end surface of the main body portion 11 toward the axial center side. An end surface of the convex portion 112 on the center side in the axial direction constitutes an engaged portion 112a that is projected in a stepped manner with respect to the main body portion 11 in the width direction. An end surface on the outer side in the axial direction of the convex portion 112 constitutes a locking portion 112 b that is convexly provided in a step shape in the width direction with respect to the main body portion 11.

  Note that the rigid rod 120 having the same shape (dimension) as the magnetostrictive rod 110 is not shown, and is hereinafter referred to as the main body portion 21, the convex portion 122, the engaged portion 122a, and the locking portion 122b. explain.

  Next, the holding member 150 will be described. 7A is a front view of the holding member 150, FIG. 7B is a cross-sectional view of the holding member 150 taken along the line VIIb-VIIb of FIG. 7A, and FIG. 7C is FIG. It is sectional drawing of the holding member 150 in the VIIc-VIIc line | wire of a). The holding member 150 has a hole 151 penetratingly formed along an axial direction (FIG. 7A, a direction perpendicular to the paper surface). The hole 151 is a space in which the axial ends of the magnetostrictive rod 110 and the rigid rod 120 are accommodated. The concave portions 154 and 154 are concave pits provided continuously to the second facing surfaces 53a and 53b, respectively, and are formed so that the bottom surfaces are parallel to each other. The concave portions 154 and 154 are spaces in which the convex portions 112 and 122 of the magnetostrictive rod 110 and the rigid rod 120 are inserted.

  The engaging portions 155 and 155 are stepped portions respectively provided between the axially outer sides of the second facing surfaces 53a and 53b and the axially central end portions of the concave portions 154 and 154. Are engaged with the engaged portions 112a and 122a formed at the axial ends of the magnetostrictive rod 110 and the rigid rod 120 accommodated in the rod. When the engaging portions 155 and 155 are engaged with the engaged portions 112a and 122a, the movement of the magnetostrictive rod 110 and the rigid rod 120 toward the axially central side with respect to the holding member 150 is restricted.

  The movement restricting portions 160 and 160 are stepped portions provided between the axially outer ends of the second facing surfaces 53a and 53b and the axially outer ends of the recesses 154 and 154, respectively. The engaging portions 112b and 122b formed at the axial end portions of the magnetostrictive rod 110 and the rigid rod 120 accommodated in 151 are engaged. When the movement restricting portions 160 and 160 are engaged with the locking portions 112b and 122b, the movement of the magnetostrictive rod 110 and the rigid rod 120 outward in the axial direction with respect to the holding member 160 is restricted.

  In the assembly of the power generating element in the second embodiment, first, the magnetostrictive rod 110 is inserted into a coil (not shown), and the axial ends of the magnetostrictive rod 110 and the rigid rod 120 are widthwise in the diagonal direction of the hole 151. While tilting the direction, the holding member 150 is inserted into the hole 151 from the axially central end face 150a (see FIG. 7B) side.

  The convex portions 112 and 122 of the magnetostrictive rod 110 and the rigid rod 120 are inserted into the concave portions 154 and 154 of the holding member 150 so that the engaged portions 112a and 122a are engaged with the engaging portions 155 and 155, and the locking portion. 112b and 122b are engaged with the movement restricting portions 160 and 160. Next, the rigid rod 120 is brought into close contact with the first opposing surface 52a, and the magnetostrictive rod 110 is brought into close contact with the first opposing surface 52b. Next, between the magnetostrictive rod 110 and the rigid rod 120 facing each other from the magnetostrictive rod 110 and the rigid rod 120 in the axial direction, the interval holding portion 30 is inserted from the tip 31 side, and the main body portions 11 and 21 and the second opposing surface 53a. , 53b (see FIG. 7B), the interval holding unit 30 is disposed in the accommodation space. Next, the permanent magnet 40 is press-fitted into the second facing surfaces 53 a and 53 b from the outside in the axial direction of the magnetostrictive rod 110 and the rigid rod 120, and juxtaposed on the outside in the axial direction of the interval holding unit 30.

  According to the second embodiment described above, the movement restricting portions 160 and 160 are provided integrally with the holding member 150 in the hole 151, and the locking formed at the axial ends of the magnetostrictive rod 110 and the rigid rod 120. By engaging with the portions 112b and 122b, the axial movement of the magnetostrictive rod 110 and the rigid rod 120 relative to the holding member 160 can be restricted. Since there is no need to provide a movement restricting portion that is separate from the holding member 150, the number of parts can be reduced, and the operation of attaching the movement restricting portion to the holding member 150 can be made unnecessary. Therefore, the assembly work of the power generation element can be simplified.

  Next, a third embodiment will be described with reference to FIGS. In the first embodiment, the engaged portion 12 a that restricts the movement of the magnetostrictive rod 10 and the rigid rod 20 toward the center in the axial direction is formed as a surface orthogonal to the axial direction of the magnetostrictive rod 10 and the rigid rod 20. Explained the case. In contrast, in the third embodiment, a case will be described in which the engaged portion 212a is formed as an inclined surface that is oblique to the axial direction of the magnetostrictive rod 210 and the rigid rod 220. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 8A is a plan view of the magnetostrictive rod 210 of the power generating element in the third embodiment, and FIG. 8B is a side view of the magnetostrictive rod 210.

  As shown in FIGS. 8 (a) and 8 (b), the magnetostrictive rod 210 has the same width (FIG. 8 (a) horizontal dimension) and thickness (FIG. 8 (b) horizontal dimension) in the axial direction. ) And a convex portion projecting in a direction perpendicular to the axis (width direction) over a predetermined length (dimension in the vertical direction in FIG. 8A) of both ends of the main body portion 11 in the axial direction. 212. The convex portion 212 is set to the same thickness as that of the main body portion 11 and is formed in a substantially triangular prism shape having a width that increases toward the outer side in the axial direction of the magnetostrictive rod 210 in plan view. The side surface of the convex portion 212 in the width direction (the left-right direction in FIG. 8A) forms an inclined surface that is set so that the width increases toward the outer side in the axial direction of the magnetostrictive rod 210. A side surface (inclined surface) protruding from the main body 11 constitutes the engaged portion 212a. Note that the rigid rod 220 having the same shape (dimension) as the magnetostrictive rod 210 is not illustrated and will be described as the main body portion 21, the convex portion 222, and the engaged portion 222a.

  Next, the holding member 250 will be described. 9A is a front view of the holding member 250, FIG. 9B is a cross-sectional view of the holding member 250 taken along line IXb-IXb of FIG. 9A, and FIG. 9C is FIG. It is sectional drawing of the holding member 250 in the IXc-IXc line | wire of a). The holding member 250 has a hole 251 penetratingly formed along the axial direction (the vertical direction in FIG. 9A). The hole 251 is a space in which the axial ends of the magnetostrictive rod 210 and the rigid rod 220 are accommodated. The engaging portions 255 and 255 are inclined surfaces connected to the second facing surfaces 53a and 53b, respectively, so that the distance between them gradually increases toward the outer side in the axial direction (the lower side in FIG. 9B). Formed.

  The engaging portions 255 and 255 are engaged with engaged portions 212 a and 222 a formed at the axial ends of the magnetostrictive rod 210 and the rigid rod 220 accommodated in the hole portion 251. When the engaging portions 255 and 255 are engaged with the engaged portions 212a and 222a, the movement of the magnetostrictive rod 210 and the rigid rod 220 toward the axially central side with respect to the holding member 250 is restricted.

  In the assembly of the power generating element in the third embodiment, first, the axial ends of the magnetostrictive rod 210 and the rigid rod 220 to which coils (not shown) are attached are inclined in the width direction in the diagonal direction of the hole 251. In the meantime, it is inserted into the hole 251 of the holding member 250 from the second facing surfaces 53a, 53b side. While the engaged portions 212a and 222a are engaged with the engaging portions 255 and 255, the rigid rod 220 is brought into close contact with the first opposed surface 52a, and the magnetostrictive rod 210 is brought into close contact with the first opposed surface 52b. Next, the gap holding portion 30 is inserted from the tip 31 side between the magnetostrictive rod 210 and the rigid rod 220 from the outside in the axial direction of the magnetostrictive rod 210 and the rigid rod 220, and the main body portions 11 and 21 and the second opposing surface 53a. , 53b (see FIG. 9 (b)), the interval holding part 30 is press-fitted into the accommodating space.

  Next, permanent magnets (not shown) are inserted into the second facing surfaces 53 a and 53 b from the outside in the axial direction of the magnetostrictive rod 210 and the rigid rod 220, and are arranged in parallel to the outside in the axial direction of the interval holding unit 30. Finally, the movement restricting portion 60 (see FIG. 1) is fixed to the end surface of the holding member 250, and the axial end surfaces of the magnetostrictive rod 210, the rigid rod 220, and the permanent magnet (not shown) are brought into contact with the movement restricting portion 60. . Thereby, the movement of the magnetostrictive rod 210, the rigid rod 220, and the permanent magnet with respect to the holding member 250 outward in the axial direction is restricted. The shape of the permanent magnet is a truncated quadrangular pyramid shape so that the side surface comes into contact with the engaging portions 255 and 255 formed on the holding member 250.

  According to the third embodiment described above, the contact area can be increased compared to the first embodiment by using the engaging portions 255, 255 and the engaged portions 212a, 222a as inclined surfaces. Can do. Since the load per unit area generated when the engaging portions 255 and 255 and the engaged portions 212a and 222a contact each other and interfere with each other can be reduced, the engaging portions 255 and 255 and the engaged portions 212a and 222a are damaged. Can be made difficult to occur.

  Next, a fourth embodiment will be described with reference to FIGS. In the first to third embodiments, the case where the engaged portions 12a, 112a, 212a, 22a, 122a, and 222a are provided in the width direction of the main body portions 11 and 21 has been described. On the other hand, in the fourth embodiment, a case where the engaged portion 312a is provided so as to protrude in the thickness direction of the main body portions 11 and 21 will be described. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 10A is a plan view of the magnetostrictive rod 310 of the power generation element according to the fourth embodiment, and FIG. 10B is a side view of the magnetostrictive rod 310.

  As shown in FIGS. 10 (a) and 10 (b), the magnetostrictive rod 310 has the same width (FIG. 10 (a) left-right dimension) and thickness (FIG. 10 (b) left-right dimension) in the axial direction. ) Formed on the main body 11 and a predetermined length at both ends in the axial direction of the main body 11 (the vertical dimension in FIG. 10 (a)) and projecting in the direction perpendicular to the axis (thickness direction). Part 312. The convex portion 312 is formed in a quadrangular prism shape whose width is the same as the width of the main body portion 11 and whose thickness is set to be thinner than the thickness of the main body portion 11. The end surface of the convex portion 312 on the center side in the axial direction constitutes an engaged portion 312a that is convexly provided in a step shape with respect to the main body portion 11 in the thickness direction. The rigid rod 320 configured in the same manner as the magnetostrictive rod 310 is not illustrated and will be described as the main body portion 21, the convex portion 322, and the engaged portion 322a.

  Next, the holding member 350 will be described. 11A is a front view of the holding member 350, FIG. 11B is a cross-sectional view of the holding member 350 taken along line XIb-XIb in FIG. 11A, and FIG. 11C is FIG. It is sectional drawing of the holding member 350 in the XIc-XIc line | wire of a). The holding member 350 has a hole 351 penetratingly formed along the axial direction (FIG. 11A). The hole 351 is a space in which the axial ends of the magnetostrictive rod 310 and the rigid rod 320 are accommodated.

  The recesses 354 and 354 are portions that are respectively recessed with respect to the first facing surfaces 52a and 52b, and have bottom surfaces that are parallel to each other. The lengths in the axial direction of the recesses 354 and 354 (FIG. 11 (c) left and right direction) are set slightly larger than the lengths of the projections 312 and 322 of the magnetostrictive rod 310 and the rigid rod 320. The recesses 354 and 354 are recesses in which the protrusions 312 and 322 of the magnetostrictive rod 310 and the rigid rod 320 are accommodated.

  The engaging portions 355 and 355 are stepped portions respectively provided between the axially outer end portions of the second facing surfaces 53a and 53b and the axially central end portions of the concave portions 354 and 354. Engage with the engaged portions 312 a and 322 a formed at the axial ends of the magnetostrictive rod 310 and the rigid rod 320 accommodated in the portion 351. When the engaging portions 355 and 355 are engaged with the engaged portions 312a and 322a, the movement of the magnetostrictive rod 310 and the rigid rod 320 toward the axially central side with respect to the holding member 350 is restricted.

  In the assembly of the power generating element in the fourth embodiment, first, the axial ends of the magnetostrictive rod 310 and the rigid rod 320 to which coils (not shown) are attached are inclined in the width direction in the diagonal direction of the hole 351. However, the holes are inserted into the hole portions 351 of the holding member 350 from the first facing surfaces 52a and 52b side. While the engaged portions 312a and 322a are engaged with the engaging portions 355 and 355, the rigid bar 320 is brought into close contact with the first facing surface 52a, and the magnetostrictive rod 310 is brought into close contact with the first facing surface 52b. Next, the interval holding portion 30 is inserted from the tip 31 side between the magnetostrictive rod 310 and the rigid rod 320 facing each other from the axial direction outside of the magnetostrictive rod 310 and the rigid rod 320, and second opposing surfaces 53a and 53b (FIG. 11 ( b) See)) and press-fit the space holding portion 30.

  Next, permanent magnets (not shown) are press-fitted into the second facing surfaces 53 a and 53 b from the outside in the axial direction of the magnetostrictive rod 310 and the rigid rod 320, and are juxtaposed on the outside in the axial direction of the interval holding unit 30. Finally, the movement restricting portion 60 (see FIG. 1) is fixed to the end surface of the holding member 350, and the axial end surfaces of the magnetostrictive rod 310, the rigid rod 320, and the permanent magnet (not shown) are brought into contact with the movement restricting portion 60. . This restricts the axial movement of the magnetostrictive rod 310, the rigid rod 320, and the permanent magnet with respect to the holding member 350. In addition, the dimension of the width direction is set so that a permanent magnet can be press-fitted in the 2nd opposing surfaces 53a and 53b.

  According to the fourth embodiment described above, since the second opposing surfaces 53a and 53b are formed at the same opposing interval over the axial direction (thickness direction) of the holding member 530, the second opposing surfaces 53a, The length in the axial direction of the interval holding unit 30 and the permanent magnet (not shown) press-fitted into 53b can be arbitrarily set. By making it possible to arbitrarily set the axial lengths of the interval holding unit 30 and the permanent magnet, the contact area between the magnetostrictive rod 310 and the rigid rod 320 and the interval holding unit 30, the magnetostrictive rod 310 and the rigid rod 320, and the permanent magnet are permanent. The contact area with the magnet can be set arbitrarily. By arbitrarily setting these contact areas, the fixed strength of the magnetostrictive rod 310 and the rigid rod 320 by the interval holding unit 30 and the magnitude of the bias magnetic field by the permanent magnet can be set.

  Next, a fifth embodiment will be described with reference to FIGS. In the fourth embodiment, a case has been described in which the movement restricting portion 60 that restricts the movement of the magnetostrictive rod 310 and the rigid rod 320 to the outside in the axial direction is configured as a separate member from the holding member 350. In contrast, in the fifth embodiment, a case where the movement restricting portion 460 is formed integrally with the holding member 450 will be described. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 12A is a plan view of the magnetostrictive rod 410 of the power generating element in the fifth embodiment, and FIG. 12B is a side view of the magnetostrictive rod 410.

  12 (a) and 12 (b), the magnetostrictive rod 410 has the same width (FIG. 12 (a) horizontal dimension) and thickness (FIG. 12 (b) horizontal dimension) in the axial direction. ) Formed on the main body 11 and a predetermined length at both ends in the axial direction of the main body 11 (the vertical dimension in FIG. 12 (a)) and projecting in the direction perpendicular to the axis (thickness direction). Part 412. The convex portion 412 is formed in a quadrangular prism shape whose width is the same as that of the main body portion 11 and whose thickness is set to be thinner than the thickness of the main body portion 11, and is axially central with respect to the axial end surface of the main body portion 11. Projected at a position slightly apart.

  The end surface on the axially central side of the convex portion 412 constitutes an engaged portion 412 a that is convexly provided in a stepped manner in the thickness direction with respect to the main body portion 11. An end surface on the outer side in the axial direction of the convex portion 412 constitutes a locking portion 412 b that is convexly provided in a stepped manner in the thickness direction with respect to the main body portion 11. The rigid rod 420 configured in the same manner as the magnetostrictive rod 410 is not illustrated and will be described as the main body 21, the convex portion 422, the engaged portion 422a, and the locking portion 422b.

  Next, the holding member 450 will be described. 13A is a front view of the holding member 450, FIG. 13B is a cross-sectional view of the holding member 450 taken along line XIIIb-XIIIb in FIG. 13A, and FIG. 13C is FIG. It is sectional drawing of the holding member 450 in the XIIIc-XIIIc line | wire of a). The holding member 450 is formed with a hole 151 penetrating along the axial direction (FIG. 7A, the direction perpendicular to the paper surface).

  The recesses 454 and 454 are portions that are respectively recessed with respect to the first facing surfaces 52a and 52b, and have bottom surfaces that are parallel to each other. The lengths in the axial direction of the recesses 454 and 454 (FIG. 13C, the left-right direction) are set slightly larger than the lengths of the protrusions 412 and 422 of the magnetostrictive rod 410 and the rigid rod 420. The recesses 454 and 454 are recesses in which the protrusions 412 and 422 of the magnetostrictive rod 410 and the rigid rod 420 are accommodated.

  The engaging portions 455 and 455 are stepped portions provided between the first facing surfaces 52a and 52b and the end portions on the axially central side of the concave portions 454 and 454, respectively, and are accommodated in the hole portion 451. Engage with engaged portions 412a and 422a formed at axial ends of the magnetostrictive rod 410 and the rigid rod 420. When the engaging portions 455 and 455 are engaged with the engaged portions 412a and 422a, the movement of the magnetostrictive rod 410 and the rigid rod 420 toward the center in the axial direction with respect to the holding member 450 is restricted.

  The movement restricting portions 460 and 460 are stepped portions respectively provided between the first facing surfaces 52 a and 52 b and the axially outer ends of the concave portions 454 and 454, and the magnetostriction accommodated in the hole portion 451. It engages with locking portions 412b and 422b formed at the axial ends of the rod 410 and the rigid rod 420. When the movement restricting portions 460 and 460 are engaged with the locking portions 412b and 422b, the movement of the magnetostrictive rod 410 and the rigid rod 420 to the outside in the axial direction is restricted with respect to the holding member 460.

  In assembling the power generating element in the fifth embodiment, first, the axial ends of the magnetostrictive rod 410 and the rigid rod 420 to which coils (not shown) are attached are inclined in the width direction in the diagonal direction of the hole 451. In the meantime, the holding member 450 is inserted into the hole 451 from the axially central end surface 450a (see FIG. 13B) side.

  The convex portions 412 and 422 of the magnetostrictive rod 410 and the rigid rod 420 are inserted into the concave portions 454 and 454 of the holding member 450 so that the engaged portions 412a and 422a are engaged with the engaging portions 455 and 455, and the locking portion 412b and 422b are engaged with the movement restricting portions 460 and 460. Next, the rigid rod 420 (main body portion 21) is brought into close contact with the first opposing surface 52a, and the magnetostrictive rod 410 (main body portion 11) is brought into close contact with the first opposing surface 52b. Next, the gap holding portion 30 is inserted from the tip 31 side between the magnetostrictive rod 410 and the rigid rod 420 from the outer side in the axial direction of the magnetostrictive rod 410 and the rigid rod 420, and second opposing surfaces 53a and 53b (FIG. 13 ( b) See)) and press-fit the space holding portion 30. Next, permanent magnets (not shown) are press-fitted into the second facing surfaces 53 a and 53 b from the outside in the axial direction of the magnetostrictive rod 410 and the rigid rod 420, and are arranged side by side on the outside in the axial direction of the interval holding unit 30. In addition, the dimension of the width direction is set so that a permanent magnet can be press-fitted in the 2nd opposing surfaces 53a and 53b.

  According to the fifth embodiment described above, the movement restricting portions 460 and 460 are provided integrally with the holding member 450 in the hole portion 451, and the locking formed at the axial ends of the magnetostrictive rod 410 and the rigid rod 420 is provided. By engaging the portions 412b and 422b, the axial movement of the magnetostrictive rod 410 and the rigid rod 420 relative to the holding member 450 can be restricted. Since there is no need to provide a movement restricting portion that is separate from the holding member 450, the number of parts can be reduced, and the operation of attaching the movement restricting portion to the holding member 450 can be made unnecessary. Therefore, the assembly work of the power generation element can be simplified.

  Next, a sixth embodiment will be described with reference to FIGS. In the first to fifth embodiments, the case where one hole 51, 151, 251, 351, 451 is formed in each of the holding members 50, 150, 250, 350, 450 has been described. On the other hand, in the sixth embodiment, a case will be described in which a plurality of holes 51 are continuously provided in the holding member 550 that holds the magnetostrictive rod 10 and the rigid rod 20. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

  FIG. 14A is a front view of the power generation element holding member 550 in the sixth embodiment, and FIG. 14B is a cross-sectional view of the holding member 550 taken along line XIVb-XIVb in FIG. FIG. 14C is a cross-sectional view of the holding member 550 taken along the line XIVc-XIVc in FIG. 15A is a front view of the power generation element 501 viewed from the outside in the axial direction, and FIG. 15B is a rear view of the power generation element 501 viewed from the center side in the axial direction. In FIG. 15A, illustration of the movement restricting portion attached to the holding member 550 is omitted, and in FIG. 15B, illustration of the axially central side of the magnetostrictive rod 10 and the rigid rod 20 is for convenience. Omitted.

  As shown in FIGS. 14A and 14B, the holding member 550 is a member formed in a rectangular plate shape when viewed from the front, and a plurality of (four in the present embodiment) hole portions 51 are formed. Is formed penetrating in the axial direction (thickness direction) at a predetermined interval. The plurality of holes 51 are provided at predetermined intervals along the first facing surfaces 52 a and 52 b, and communication holes 551 that communicate the holes 51 with each other are formed in the holding member 550. As shown in FIG. 14C, the communication hole 551 is formed through the holding member 550 in the thickness direction (FIG. 14C, left-right direction), and has a height (FIG. 14A, vertical dimension). The height of the hole 51 is set to be smaller. By forming the communication hole 551 at the center in the height direction of the hole 51, the engaging portion 55 can be provided at a position above and below the communication hole 551. The height of the engaging portion 55 provided at the upper and lower positions with respect to the communication hole 551 is set to the same dimension as the thickness of the engaged portions 12 a and 22 a provided on the magnetostrictive rod 10 and the rigid rod 20.

  By providing the engaging portions 55 at positions above and below the communication hole 551, the magnetostrictive rod 10 and the rigid rod 20 can be respectively disposed above and below the hole 55. Since the height of the engaging portion 55 is set to the same size as the thickness of the engaged portions 12a and 22a provided on the magnetostrictive rod 10 and the rigid rod 20, the magnetostrictive rod 10 attached to the hole 51 and Each flat surface of the rigid rod 20 and the inner wall surface of the communication hole 551 can be flush with each other (there is no step).

  As shown in FIG. 15A, the permanent magnet 40 does not need to be provided at the position of the communication hole 551 and may be disposed between the magnetostrictive rod 10 and the rigid rod 20. This is because it is sufficient for the permanent magnet 40 to apply a bias magnetic field to the magnetostrictive rod 10 and the rigid rod 20.

  On the other hand, as shown in FIG. 15B, the interval holding portion 530 is not provided for each hole 51, but a rectangular bar-like member continuous to the hole 51 and the communication hole 551 can be arranged. Thereby, compared with the case where the space | interval holding | maintenance part 530 is inserted for every hole 51, a number of parts can be reduced and the assembly of the electric power generation element 501 can be simplified. Further, since the flat surfaces of the magnetostrictive rod 10 and the rigid rod 20 and the communication hole 551 are flush with each other, the rectangular rod-shaped interval holding portion 530 can be used, and the processing cost of the interval holding portion 530 can be reduced.

  According to the power generating element 501 described above, the plurality of magnetostrictive rods 10 are formed in the width direction of the magnetostrictive rod 10 and the rigid rod 20 (left and right direction in FIG. 15A) by forming the plurality of holes 51 in the holding member 550. Since the rigid rod 20 is disposed, the gap between the magnetostrictive rod 10 and the rigid rod 20 in the width direction can be reduced. As a result, the dimension of the power generation element 501 in the width direction can be suppressed, and the power generation element 501 can be downsized.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the numerical values given in the above embodiment are merely examples, and other numerical values can naturally be adopted.

  In each of the above-described embodiments, the case where the power generating elements 1 and 501 are freely vibrated has been described. However, the present invention is not necessarily limited to this, and the power generating elements 1 and 501 are forcedly vibrated (for example, in FIG. The holding member 50 on the other end side may be forcibly moved relative to the vertical direction).

  In each of the above-described embodiments, the case where the coil is wound only on the magnetostrictive rods 10, 110, 210, 310, and 410 has been described. However, the present invention is not limited to this, and the magnetostrictive rods 10, 110, 210, and 310 are not necessarily limited thereto. , 410 and the rigid rods 20, 120, 220, 320, 420 may be wound with coils. In this case, the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420 are made of the same magnetostrictive material (that is, the rigid rods 20, 120, 220, 320, 420 need not be made of a material having a magnetostriction effect lower than that of the magnetostrictive rods 10, 110, 210, 310, 410).

  In each of the above embodiments, the case where the permanent magnet 40 is disposed between the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420 is described. It is not limited. For example, it replaces with the permanent magnet 40 and the thing using an electromagnet is employable. Further, if a magnetic flux from the outside of the power generating elements 1 and 501 generates a magnetic flux in the magnetic circuit, a configuration in which magnets are arranged outside the power generating elements 1 and 501 is possible. Further, it is possible to provide a back yoke for applying bias magnetization to the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420 by the magnetomotive force of a permanent magnet or an electromagnet. In the case where the permanent magnet 40 is not disposed between the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420, the interval holding portions 30, 530 are made of a magnetic material. Thus, a magnetic loop is formed between the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420.

  In each of the above-described embodiments, a case has been described in which the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420 have the same dimensions (that is, the thickness dimension and the width dimension). However, the present invention is not necessarily limited to this, and the dimensions of the rigid rods 20, 120, 220, 320, 420 are different from the dimensions of the magnetostrictive rods 10, 110, 210, 310, 410 (one of the thickness dimension and the width dimension). Or only different values).

  In each of the above-described embodiments, the case where the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420 are formed in a rectangular cross section has been described. However, the present invention is not necessarily limited thereto. Of course, other shapes are possible. Examples of other shapes include a square cross section, a circular cross section, an elliptical cross section, and a polygonal cross section (for example, a hexagonal cross section).

  In addition, for example, when the magnetostrictive rod 11 or the like has a circular cross section, the permanent magnets 14 and 15 are in line contact, and when the contact area cannot be secured, the size or magnetomotive force of the permanent magnets 14 and 15 is increased, Alternatively, a spacer made of a magnetic material corresponding to the shape of both the magnetostrictive rods 10, 110, 210, 310, 410, etc. and the permanent magnet 40 (that is, a shape that is in surface contact with both) is interposed and contacted. It is preferable to secure an area. This is because the bias magnetic field that can be applied can be increased.

  In the above embodiments, the engaged portions 12a, 112a, 212a, 312a are arranged in the width direction or thickness direction of the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420. , 412a, 22a, 122a, 222a, 322a, 422a has been described. However, the present invention is not limited to this, and the engaged portion is not limited to the magnetostrictive rods 10, 110, 210, 310, 410 and the rigidity. Of course, the rods 20, 120, 220, 320 and 420 can be recessed. In this case, the holding members 50, 150, 250, 350, 450, and 550 are provided with engaging portions that are projected so as to be engageable with the engaged portions corresponding to the engaged portions.

  In each of the above embodiments, the engaging portion 55 is provided on one of the pair of first opposing surfaces 52a and 52b or the pair of second opposing surfaces 53a and 53b formed on the holding members 50, 150, 250, 350, 450, and 550. , 155, 255, 355, and 455 have been described, but the present invention is not necessarily limited thereto. Naturally, the engaging portions 55, 155, 255, 355, and 455 can be formed on both the first facing surfaces 52a and 52b or the second facing surfaces 53a and 53b. In this case, the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420 are engaged so as to be able to engage with the engaging portions corresponding to the engaging portions. Provide joints.

  In the above-described embodiment, the case where the holes 51, 151, 251, 351, 451 are formed to penetrate in the thickness direction (axial direction) of the holding members 50, 150, 250, 350, 450, 550 has been described. However, it is not necessarily limited to this. The holding members 50, 150, 250, 350, 450, and the storage spaces (dents) that can store the axial ends of the magnetostrictive bars 10, 110, 210, 310, 410 and the rigid bars 20, 120, 220, 320, 420 are provided. If it can be provided in 550, it is not necessary to form a hole in the holding member 50, 150, 250, 350, 450, 550, and it is naturally possible to form the hole in a bottomed shape.

  In each of the above embodiments, the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420 are paired with the holes 51, 151, 251, 351, 451 (one by one). The case where it is provided has been described. However, the number of magnetostrictive rods 10, 110, 210, 310, 410 and rigid rods 20, 120, 220, 320, 420 provided in the holes 51, 151, 251, 351, 451 is not limited to this. If the length of the second facing surfaces 53a and 53b in the direction perpendicular to the axis is set large, it is naturally possible to provide three or more magnetostrictive rods and rigid rods in the holes 51, 151, 251 351, and 451. In this case, an interval holding portion is inserted between the opposing portions of the magnetostrictive rod and the rigid rod to hold the interval between the magnetostrictive rod and the rigid rod.

  In each of the above-described embodiments, the engaged portions 12a and 112a having the same shape (dimension) are provided at both ends in the axial direction of the magnetostrictive rods 10, 110, 210, 310, 410 and the rigid rods 20, 120, 220, 320, 420, respectively. , 212a, 312a, 412a, 22a, 122a, 222a, 322a, 422a has been described, but is not necessarily limited to this, the engaged portion on one end side in the axial direction and the other end side in the axial direction Of course, it is possible to change the shape and the size of the engaged portion. In that case, the holding members 50, 150, 250, 350, 450, and 550 attached to the end portions in the axial direction are provided with engaging portions 55, 155, 255, 355, and 455 corresponding to the engaged portions.

  Although not described in the sixth embodiment, a reinforcing portion is provided to extend in a direction (FIG. 14 (a) vertical direction) orthogonal to the extending direction of the communication hole 551 (FIG. 14 (a) left-right direction). It is naturally possible to connect the opposing inner wall surfaces of the holes 551 with one or more reinforcing portions. Since the defect area of the holding member 550 can be reduced by providing the reinforcing portion, it is possible to suppress the mechanical strength of the holding member 550 from being lowered by the communication hole 551.

  In the sixth embodiment, the case where the communication holes 551 that communicate with the plurality of hole portions 51 are provided has been described. However, the communication holes 551 are not necessarily required. This is because if the hole 51 is formed in the holding member 550, both axial ends of the magnetostrictive rod 10 and the rigid rod 20 can be held.

1,501 Power generation element 10, 110, 210, 310, 410 Magnetostrictive rods 12a, 112a, 212a, 312a, 412a Engaged portions 20, 120, 220, 320, 420 Rigid rods 22a, 122a, 222a, 322a, 422a Engaging portion 30, 530 Interval holding portion 40 Permanent magnet 50, 150, 250, 350, 450, 550 Holding member 51, 151, 251, 351, 451 Hole portion 52a, 52b First opposing surface 53a, 53b Second opposing surface 55, 155, 255, 355, 455 Engagement part 60, 160, 460 Movement restriction part

Claims (4)

A magnetostrictive rod that is installed in a coil formed by winding a conductive wire and is configured in a rod shape from a magnetostrictive material;
A rigid rod which is arranged opposite to the magnetostrictive rod and is formed into a rod shape from a magnetic material and forms a magnetic loop with the magnetostrictive rod;
A pair of holding members that respectively hold both ends in the axial direction of the rigid rod and the magnetostrictive rod, and the magnetostrictive rod and the rigid rod expand or contract in the axial direction by relative movement of the pair of holding members to generate electric power. In the power generation element to be performed,
The magnetostrictive rod and the rigid rod each include an engaged portion that is protruded or recessed at each axial end portion in a direction intersecting the axial direction of the magnetostrictive rod and the rigid rod,
The holding member is recessed in the axial direction and has a pair of first opposing surfaces and a pair of second opposing surfaces whose inner walls face each other;
The hole is formed on at least one of the first facing surface and the second facing surface, and engages with the engaged portion formed at the axial end of the magnetostrictive rod and the rigid rod, and holds An engagement portion for restricting movement of the magnetostrictive rod and the rigid rod toward the center in the axial direction with respect to a member;
A power generating element, comprising: a pair of interval holding portions that are inserted between opposing ends of the magnetostrictive rod and the rigid rod in the axial direction, respectively, and hold an opposing interval of the magnetostrictive rod and the rigid rod.   A pair of magnetic poles and rigid rods that are inserted between opposite ends of the axial direction of the magnetostrictive rods and the rigid rods with different magnetic poles, and that are arranged in parallel with the spacing holding portions along the axial direction of the magnetostrictive rods and the rigid rods. The power generating element according to claim 1, further comprising a permanent magnet.   3. The power generating element according to claim 1, wherein the hole is formed to penetrate the holding member along an axial direction of the magnetostrictive rod and the rigid rod.   The power generation element according to claim 3, further comprising a movement restricting portion that restricts movement of the magnetostrictive rod and the rigid rod toward the outside in the axial direction with respect to the holding member.

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