JP5114650B2 - Rotary solenoid - Google Patents

Description

  The present invention relates to a rotary solenoid, and more particularly, to a rotary solenoid that is easy to downsize and has a structure suitable for obtaining high torque at the same time.

  The rotary solenoid generally has a configuration such as a coil, a fixed magnetic pole, a rotor, a permanent magnet, a stopper, and a shaft. Then, the rotor rotates until it is regulated by the stopper by the magnetic force generated when the coil is energized, and when the energization is stopped, the rotor is attracted to the permanent magnet and returned to the position before the energization. Many.

  In such a rotary solenoid, various structures have been proposed in order to reduce the size. For example, in the rotary solenoid disclosed in Japanese Patent Application Laid-Open No. 2005-175358, a rotor (rotor) is not disposed in a space surrounded by a coil, but a plate-like body made of a permanent magnet and a magnetic material are disposed above the coil. A rotor made of a shaft made of a material is arranged. The rotary solenoid uses a magnetic material for a part of the case, and obtains torque by a magnetic circuit having the rotor, the shaft, and the case as paths when the coil is energized. This structure eliminates the need for a yoke, thereby enabling a reduction in the size of the rotary solenoid and the number of components. However, this structure has a big problem from the viewpoint of obtaining high torque.

  In the above structure, when the coil is energized, a magnetic force is generated by a magnetic circuit having the rotor, the shaft, and the case as paths. Therefore, since the shaft and the case are in close contact with each other and the contact area is large, magnetic flux leakage of the magnetic circuit can be prevented, so that high torque can be easily obtained. However, if the shaft and the case are in close contact with each other, the frictional resistance at the time of rotation becomes large, so that an effect of reducing the torque occurs.

Further, in this structure, when the coil is energized, a force that tilts the shaft by a suction force or a repulsive force generated between the rotor and the case works. Therefore, it is necessary to sufficiently secure the gap between the shaft and the coil bobbin and the gap between the rotor and the coil bobbin so that they do not come into contact with each other in consideration of the inclination of the shaft. However, the larger this gap is, the more the magnetic flux generated in the magnetic circuit is reduced. Further, if the shaft and the coil bobbin come into contact with each other, a large frictional resistance is generated and torque is reduced. Therefore, in this structure, it is not easy to add a modification for obtaining a high torque.
JP 2005-175358 A

  In order to solve the above-described problems, an object of the present invention is to provide a rotary solenoid that is easy to downsize and has a structure suitable for obtaining high torque at the same time.

  The invention described in claim 1 is a coil bobbin formed in a substantially cylindrical shape, a first permanent magnet and a second permanent magnet disposed inside the coil bobbin, and a metal wire wound around the coil bobbin. In the rotary solenoid having a coil formed integrally with the coil bobbin and a shaft that is rotatable to the left and right, the coil bobbin has a first vertical groove and a second vertical groove on the outer peripheral surface. Grooves are formed so as to face each other, and the first permanent magnet is disposed in the vicinity of a portion facing the first vertical groove on the inner peripheral surface of the coil bobbin, and the second permanent magnet is The coil bobbin is disposed in the vicinity of a portion facing away from the second vertical groove on the inner peripheral surface of the coil bobbin, and the magnetization directions of the first permanent magnet and the second permanent magnet are reversed. The coil is Part of the wire is wired inside the first vertical groove and the second vertical groove of the coil bobbin, and is wired inside the first vertical groove when the coil is energized The rotary solenoid is characterized in that the current flowing through the second vertical groove and the current flowing through the portion wired inside the second vertical groove are in opposite directions.

  According to a second aspect of the present invention, in the first aspect of the present invention, the coil bobbin is further disposed so as to be interposed between the first permanent magnet and the second permanent magnet. In addition, the rotary solenoid is characterized by having an internal fixed magnetic pole formed in a substantially cylindrical shape and having a part of the shaft inserted therein.

  According to a third aspect of the present invention, a coil bobbin formed in a substantially cylindrical shape, a permanent magnet disposed in the coil bobbin, and a metal wire wound around the coil bobbin. A rotary solenoid having a shaft formed integrally with the coil bobbin and rotatable to the left and right, and the coil bobbin has a first vertical groove and a second vertical groove on an outer peripheral surface. Are formed so as to face each other, and the permanent magnet is disposed in the vicinity of a portion where the first polar portion faces away from the first vertical groove on the inner peripheral surface of the coil bobbin, and the second polar portion Is disposed in the vicinity of a portion of the inner peripheral surface of the coil bobbin that faces away from the second vertical groove, and the coil has a part of the filament that is the first vertical groove and the second vertical groove of the coil bobbin. Within the longitudinal groove And the current flowing through the portion wired inside the first vertical groove and the current flowing through the portion wired inside the second vertical groove when the coil is energized are upside down. This is a rotary solenoid.

  The invention according to claim 4 is the invention according to claim 3, further comprising an internal fixed magnetic pole disposed inside the permanent magnet and having at least a part of a side surface in contact with the permanent magnet. A rotary solenoid characterized by the following.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the coil bobbin circulates on an outer peripheral surface, and the first vertical groove and the first An upper circumferential groove formed so as to be connected to the upper end of the second vertical groove, and an outer peripheral surface, and is connected to the lower ends of the first vertical groove and the second vertical groove. A rotary solenoid characterized by comprising a lower circumferential groove formed at the bottom.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the coil bobbin has an outer peripheral surface instead of the first vertical groove and the second vertical groove. The rotary solenoid is characterized in that a first slit and a second slit are formed so as to extend in a vertical direction at the opposing portions.

  According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the coil bobbin is connected to the upper ends of the first slit and the second slit so as to go around the outer peripheral surface. And an upper circumferential groove formed on the outer circumferential surface and a lower circumferential groove formed so as to connect to the lower ends of the first slit and the second slit. A rotary solenoid characterized by the following.

  According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the coil bobbin is formed in a bottomed cylindrical shape having a bottom on the base end side of the shaft. In addition, a slit having a substantially arc shape is formed at the bottom, and the shaft has a proximal end fixed to the bottom of the coil bobbin and formed in a substantially rod shape, and a distal end side of the slit at the bottom of the coil bobbin. The rotary solenoid further includes a stopper held in a state of being inserted into the rotary solenoid.

  The invention according to claim 9 is the invention according to claim 2 or claim 4, further comprising a bearing in which an outer ring is fitted to the inner peripheral surface of the inner fixed magnetic pole and the shaft is fitted to the inner ring. This is a rotary solenoid.

  According to the first aspect of the present invention, a part of the filament forming the coil is opposed to the first permanent magnet and the second permanent magnet through the coil bobbin, and the first permanent magnet is energized when the coil is energized. Since the current flowing through the part facing the magnet and the part facing the second permanent magnet is in the opposite direction, the charged particles flow in the coil, and the Lorentz force against this charged particle flow Therefore, a relatively large torque can be obtained. In addition, since an attractive force or a repulsive force is generated between the two permanent magnets and the coil at the same time, a force for tilting the coil bobbin is not generated. As a result, the shaft provided integrally with the coil bobbin does not tilt.

  According to the second aspect of the present invention, since the internal fixed magnetic pole forms a part of the magnetic circuit, the electric power applied to the coil can be efficiently converted into the rotational force of the coil bobbin and the shaft.

  According to the invention described in claim 3, the first polar part and the second polar part are opposed to each other through the coil bobbin with a part of the wire forming the coil, and the first polar part is energized when the coil is energized. Since the current flowing through the part facing the polar part and the part facing the second polar part is made upside down, a charged particle can flow in the coil, and Lorentz against this charged particle flow. Since the torque can be obtained by force, a relatively large torque can be obtained. In addition, since an attractive force or a repulsive force is generated between the two polar parts and the coil at the same time, no force for tilting the coil bobbin is generated. As a result, the shaft provided integrally with the coil bobbin does not tilt.

  According to the fourth aspect of the present invention, since the internal fixed magnetic pole forms a part of the magnetic circuit, the power applied to the coil can be efficiently converted into the rotational force of the coil bobbin and the shaft.

  According to the fifth aspect of the present invention, the upper circumferential groove and the lower circumferential groove connected to the upper end portion and the lower end portion of the first vertical groove and the second vertical groove are formed. It is possible to easily form a coil by winding the coil bobbin around the peripheral side surface while being disposed inside the first vertical groove and the second vertical groove.

  According to the invention described in claim 6, since the first slit and the second slit are formed instead of the first longitudinal groove and the second longitudinal groove, the coil wire is directly connected to the permanent magnet. Therefore, it becomes easy to set the gap between the two to the minimum necessary distance.

  According to the seventh aspect of the present invention, since the upper circumferential groove and the lower circumferential groove connected to the upper end portion and the lower end portion of the first slit and the second slit are formed, The coil can be easily formed by winding the coil bobbin around the circumferential side surface while being disposed inside the vertical groove and the second vertical groove.

  According to the eighth aspect of the present invention, it is not necessary to provide a space for providing the stopper and the slit for stopping the rotation of the coil bobbin around the coil bobbin.

  According to the ninth aspect of the present invention, since the shaft bearing is provided integrally with the internal fixed magnetic pole, it is not necessary to secure a place for providing the bearing outside the coil bobbin.

[First Embodiment]
Below, the rotary solenoid which concerns on the 1st Embodiment of this invention is demonstrated based on drawing. FIG. 1 is an exploded perspective view of a rotary solenoid according to a first embodiment of the present invention. In FIG. 1, 10 is a rotary solenoid, 20 is a coil bobbin, 21 is an upper frame, 22a and 22b are vertical frames, 23 is a lower frame, 24 is a shaft fixing portion, 25 is a screw hole, 26a and 26b are guide holes, and 27 is Upper circumferential groove, 28a is a longitudinal groove, 29 is a lower circumferential groove, 40 is a structure support, 41 is an internal fixed magnetic pole, 42a and 42b are support parts, 43 is an end cap part, 44 is a through hole, 45a and 45b are stoppers Fitting hole, 46 is a bearing fitting hole, 47 and 48 are inner peripheral surfaces, 49 is a stepped surface, 50a and 50b are permanent magnets, 51 is a case, 52 is an opening, 53 is an end cap, 54a and 54b are terminals Holes 55a and 55b are terminals, 56 is a protective plate, 57 is an opening, 58a and 58b are terminal holes, 60 is a coil, 61 is an upper wire, 62a and 62b are vertical wires, and 63 is a wire Partial wire strips, 64 screws, 65 and 66 washers, 67 and 68 ball bearings, 69 a flexible wiring board, 70 a shaft, 71 a proximal end portion, 72 an intermediate portion, 73 a distal end portion, and 74 a screw The holes 75a and 75b are stoppers. FIG. 2 is a perspective view showing a rotary solenoid according to the first embodiment of the present invention, in which (a) is a perspective view of a terminal side and (b) is a perspective view of a shaft front end side. 2 denote the same components as those in FIG. In addition, about the coil 60, in each drawing including FIG.1 and FIG.2, description of the fine aspect which wound the filament repeatedly is abbreviate | omitted, and it represents with the external appearance shape.

  As shown in FIG. 2, the rotary solenoid 10 is housed in a case 51 having an approximately cylindrical inner structure, and terminals 55a and 55b are provided on the end surface of the case 51 shown in FIG. A shaft 70 projects from the end face shown. As shown in FIG. 1, the internal structure of the rotary solenoid 10 is roughly divided. As shown in FIG. 1, a structural support body 40 serving as a base for supporting the internal structure, an internal fixed magnetic pole 41 provided integrally with the structural support body 40, and a shaft. 70, stoppers 75a and 75b, permanent magnets 50a and 50b attached to the outer peripheral surface of the internal fixed magnetic pole 41, a coil bobbin 20 provided so as to cover them, a coil 60 wound around the outer peripheral surface of the coil bobbin, and A case 51 is provided so as to cover them.

  The detailed structure of the rotary solenoid 10 will be described below in detail with reference to FIG. The structural support body 40 includes support portions 42 a and 42 b and an end cap portion 43. The support portions 42a and 42b are formed so as to rise from the end cap portion 43 toward the terminals 55a and 55b. The outer peripheral surface is a convex arc surface, and the inner peripheral surface is a flat surface. Further, the inner peripheral surfaces of these support portions are opposed to each other, and the end cap portion 43 is disposed so that the center thereof is in the middle thereof. Further, these inner peripheral surfaces are set at a suitable interval for fitting the internal fixed magnetic pole 41 therebetween. Furthermore, stopper fitting holes 45a and 45b for fitting and fixing the stoppers 75a and 75b are formed at the tops of the support portions 42a and 42b (the base end side of the shaft 70). In this embodiment, either a magnetic material or a nonmagnetic material can be used as the material for the structural support 40.

  The stoppers 75a and 75b are on the tip side. The end cap portion 43 is formed in a substantially disk shape, and has a step formed so that the edge and the vicinity thereof are thin, and the support portions 42a and 42b rise from a thick portion near the center. Further, the center and the vicinity thereof serve as a bearing fitting hole 46, and a ball bearing 68 is fitted into the bearing fitting hole 46.

  Further, as shown in FIG. 3B, the base end side (upper side) of the shaft 70 is contracted on the inner peripheral surface 48 of the bearing fitting hole 46 at a height corresponding to the thickness of the ball bearing 68. A step is formed so as to have a diameter. Therefore, when the ball bearing 68 is press-fitted into the bearing fitting hole 46, the press-fitting can be stopped at the point where the ball bearing 68 abuts against the step, so that the ball bearing 68 can be prevented from being excessively pushed. Further, the step surface 49 between the thin portion and the thick portion of the structural support 40 is formed so as to have a slight gap between the lower portion 23 of the coil bobbin 20. The gap between the stepped surface 49 and the lower frame 23 of the coil bobbin 20 is set to be very small. Therefore, when the coil bobbin 20 is rotated, if the lower frame 23 side of the coil bobbin 20 is swung for some reason, that is, if the top is rotated while swinging the neck, the inner peripheral surface 36 of the lower frame 23 is stepped. By contacting the surface 49, the swinging of the lower frame 23 is suppressed.

  As shown in FIG. 1, the coil bobbin 20 is formed such that the vertical frames 22 a and 22 b rise from the lower frame 23, and the upper frame 21 is formed on the tops of the vertical frames 22 a and 22 b (the base end side of the shaft 70). ing. The lower frame 23 and the upper frame 21 are formed in an annular shape for winding a copper wire, also called a coil wire. The vertical frames 22a and 22b are arranged so that the shaft 70 is interposed, and the central axis of the shaft 70 is an intermediate position.

  The coil bobbin 20 will be described in more detail based on FIGS. 3 and 5. FIGS. 3A and 3B are cross-sectional explanatory views (1) of the rotary solenoid according to the first embodiment of the present invention, in which FIG. 3A is a front view, FIG. 3B is a cross-sectional view along line AA, and FIG. It is B line sectional drawing. In FIG. 3, 28b is a vertical groove, 30 is a recess, 34a and 34b are vertical frames, 39 is an inner peripheral surface, 59 is a recess, 62b is a vertical line, and other reference numerals are the same as those in FIG. FIG. 5 is a perspective view showing the coil bobbin according to the first embodiment. In FIG. 5, 30 is a recess, 31a and 31b are notches, 32a is a through hole, 33 is a tapered portion, 35 is a top plate portion, 36 is an inner peripheral surface, and 37a and 37b are notches.

  As shown in FIG. 3 (b), the coil bobbin 20 is made of resin, and a lid-like top plate portion 35 is formed on the lower side of the upper frame 21. The inner peripheral surface 39 and the top plate portion of the upper frame 21 are formed. The upper surface of 35 constitutes a recess 30 shown in FIG. As will be described later, the recess 30 is a space for accommodating a flexible wiring board 69 which is a connection means between the terminals 55a and 55b and the wire constituting the coil 60. In addition, a shaft fixing portion 24 is formed at the center of the recess 30 so as to protrude from the upper frame 21 toward the end cap 53. This is because, by extending the shaft fixing portion 24 toward the end cap 53, the area of the portion where the shaft 70 and the coil bobbin 20 are fixed increases, and the fixing state of both can be made stronger.

  Further, the shaft fixing portion 24 has a screw hole 25 formed in the center thereof. The shaft 70 is fixed by screws 64 and washers 65 and 66 in a state where the distal end portion 73 side is inserted into the shaft fixing portion 24, and the coil bobbin 20 and the shaft 70 are provided integrally. Therefore, when the coil bobbin 20 rotates, the shaft 70 also rotates accordingly. In addition, guide holes 26 a and 26 b are formed in the top plate portion 35. The guide holes 26 a and 26 b are substantially arc-shaped slits, and are positioned and shaped so as to be point-symmetric with respect to the center of the top plate portion 35, that is, the central axis of the shaft 70. The stoppers 75a and 75b described above are inserted into the guide holes 26a and 26b at the distal ends. Therefore, the rotation of the coil bobbin 20 is restricted when the tip ends of the stoppers 75a and 75b abut against the edges of the guide holes 26a and 26b, respectively. Therefore, the rotation angle of the shaft 70 obtained in the rotary solenoid 10 can be arbitrarily set in a range of approximately 10 degrees or more to less than 180 degrees according to the lengths of the guide holes 26a and 26b.

  Further, as shown in FIG. 3B, the inner peripheral surface 36 of the lower frame 23 shown in FIG. 5 is very close to the step surface 49 of the structural support 40. The tolerance is set such that the surface 49 is always in contact with the surface 49 and does not hinder the rotation of the coil bobbin 20. Therefore, as described above, when the coil bobbin 20 is rotating stably, the inner peripheral surface 36 and the stepped surface 49 do not contact each other, but when the lower frame 23 side of the coil bobbin 20 is swung during rotation. Since the rocking is suppressed by the contact with the stepped surface 49, there is an advantage that the torque of the shaft 70 is stabilized. As shown in FIG. 3B, the lower surface of the top plate portion 35 of the coil bobbin 20 is quite close to the upper surfaces of the internal fixed magnetic pole 41 and the ball bearing 67. Tolerances that do not hinder the rotation of

  As shown in FIG. 5, an upper circumferential groove 27 and a lower circumferential groove 29 are formed in the circumferential direction of the upper frame 21 and the lower frame 23 of the coil bobbin 20, respectively. Further, vertical grooves 28 are formed in the vertical frames 22a and 22b, and vertical grooves (not shown) are also formed in the vertical frames 34a and 34b. By forming these grooves, when winding the filament around the coil bobbin 20, it is possible to prevent the predetermined portion from being unwound. Further, a tapered surface 33 is formed below the upper circumferential groove 27. The taper surface 33 is arranged such that when the wire wound around the end portion of the upper circumferential groove 27 hangs on the edge of the upper circumferential groove 27, the line slides down the taper surface 33 and fits in the upper circumferential groove 27. To form. In addition, although not shown in figure, such a taper surface is also formed in the lower circulation groove | channel 29 side. Furthermore, notches 31a and 31b, and notches 37a and 37b are formed at corners of a portion connecting the vertical groove 28 and the upper circumferential groove 27 and a portion connecting the vertical groove 28 and the lower circumferential groove 29. Respectively. These notches are also formed to facilitate winding of the filament. Although not shown, similar notches are also formed in the vertical frames 34a and 34b.

  As shown in FIG. 1, the coil 60 is formed by winding a metal wire corresponding to the configuration of the coil bobbin 20, that is, the upper frame 21, the vertical frames 22 a and 22 b, and the lower frame 23. The wire 62a and 62b and the lower wire 63 are used. In this embodiment, the wire inserted from the inner peripheral surface 39 side of the through hole 32a formed in the upper frame 21 shown in FIG. 5 is first passed through the upper circumferential groove 27 and the vertical groove 28 downward. After half-turning the lower circumferential groove 20, the vertical groove opposite to the vertical groove 28 is further passed upward, and then the upper circumferential groove 27 is half-circulated on the side without the through-hole 32 a, and then the vertical groove 28 is again passed downward. Next, after making a half turn on the side of the lower circumferential groove 20 that did not pass through the tip, the vertical groove on the opposite side of the longitudinal groove 28 is passed upward, and then the side of the upper circumferential groove 27 with the through hole 32a is made a half turn. Thereafter, the coil 60 is formed by winding so as to repeat this.

  When the coil 60 is energized, the current flowing through the vertical wire 62a and the current flowing through the vertical wire 62b are in the opposite directions. The order of winding the wire is not limited to this example, but is wound around one side and the other side of the lower circumferential groove 20 in order to prevent the coil bobbin 20 from swinging during rotation. The number of turns is preferably the same. The material of the coil 60 is not limited to copper, and any metal suitable for forming the coil can be used. Further, FIG. 3 (c) shows a state when the coil 60 is not energized. As shown in this figure, when the coil 60 is not energized, the vertical stripes 62a and 62b are end portions of the permanent magnets 50a and 50b. Located in the vicinity. By arranging in this manner, the rotation angle of the coil bobbin 20 can be increased when the coil 60 is energized.

  The internal fixed magnetic pole 41 is made of a magnetic material and is formed in a cylindrical shape as shown in FIGS. 1 and 3B. Moreover, it fits between the support parts 42a and 42b of the structure support body 40, and also adheres to the structure support body 40 with the adhesive agent. Furthermore, permanent magnets 50a and 50b are fixed to the side surfaces not covered with the support portions 42a and 42b with an adhesive. In addition, a ball bearing 67 is fitted into the upper opening of the through hole 44. A step is formed on the inner peripheral surface 47 of the upper opening so that the tip side (lower side) of the shaft 70 is reduced in diameter at a position corresponding to the thickness of the ball bearing 67. Therefore, when the ball bearing 67 is press-fitted into the through hole 44, the press-fitting can be stopped when the ball bearing 67 abuts against the step, and therefore it is possible to prevent the ball bearing 67 from being pushed excessively.

  The permanent magnets 50 a and 50 b are formed such that the inner surface is a concave arc surface and the outer surface is a convex arc surface, and the center of curvature of the inner surface and the center of curvature of the outer surface coincide with the central axis of the shaft 70. ing. Further, as can be seen from FIGS. 3B and 4B, the permanent magnets 50a and 50b are provided in a narrow cylindrical space between the coil bobbin 20 and the internal fixed magnetic pole 41, and the permanent magnet 50a. And the gap between 50b and the vertical strips 62a and 62b of the coil 60 is very small. Furthermore, the outer peripheral surfaces of the permanent magnets 50a and 50b face the vertical strips 62a and 62b over the entire width in the vertical direction. Therefore, in this embodiment, it can be said that the entire outer peripheral surfaces of the permanent magnets 50a and 50b contribute to the generation of torque.

  The permanent magnet 50a is magnetized so that the inner peripheral surface facing the shaft 70 has an N pole and the outer peripheral surface has an S pole. Further, the permanent magnet and 50b are magnetized so that the inner peripheral surface facing the shaft 70 is an S pole and the outer peripheral surface is an N pole. These magnetization directions are preferably oriented so as to spread in a fan shape around the central axis of the shaft 70. That is, when magnetized in a fan shape, when the rotary solenoid 10 is viewed in plan, the direction of the magnetic lines of force of the permanent magnets 50a and 50b is perpendicular to the tangent of any part of the inner or outer surface. Since each filament constituting the coil 60 moves so as to draw a virtual arc surface when the coil bobbin 20 is rotating, the direction of the magnetic lines of force of the permanent magnets 50a and 50b should be orthogonal to the virtual arc surface. become. That is, the force that moves the filaments of the coil 60 in the tangential direction of the virtual arcuate surface is maximized when the permanent magnets 50a and 50b are magnetized in this way. In other words, the magnetized form can obtain the torque most efficiently. The permanent magnets 50a and 50b may be magnetized in the direction opposite to that shown in FIG.

  As shown in FIG. 1, the case 51 is formed in a substantially cylindrical shape, and an end cap 53 and an end cap portion 43 of the structural support body 40 are fitted as lids for closing both ends of the case 51. The case 51 is made of a magnetic material, and forms a magnetic circuit together with the internal fixed magnetic pole 41 and the permanent magnets 50a and 50b when the coil 60 is energized, as will be described later. Therefore, the case 51 has both a function of protecting the internal mechanism of the rotary solenoid 10 and a function as an external fixed magnetic pole. The end cap 53 is formed in a substantially disk shape, and has a step formed such that the edge and the vicinity thereof are thin. The step is fitted into the opening 52 of the case 51. Further, terminal holes 54a and 54b are formed in the thick portion of the end cap 53 in order to lead out the terminals 55a and 55b to the outside. Further, as shown in FIG. 3B, the end cap 53 has a recess formed on the lower surface thereof in order to prevent the head of the screw 64 from coming into contact with the end cap 53 and preventing the coil bobbin 20 and the shaft 70 from rotating. 59 is formed.

  The protection plate 56 is formed in a substantially disk shape by an insulating material, an opening 57 is formed at the center, and terminal holes 58a and 58b are formed at positions where the terminals 55a and 55b are wired. As shown in FIG. 3B, the opening 57 is formed to prevent the shaft fixing portion 24 of the coil bobbin 20 from contacting the protective plate 56 and preventing the shaft 70 and the coil bobbin 20 from rotating. The terminal holes 58a and 58b are formed to insert the terminals 55a and 55b, respectively, and the protective plate 56 is held by the inserted terminals 55a and 55b. As will be described later, a part of the flexible wiring board 69 moves as the coil bobbin 20 rotates. If there is nothing between the terminals 55a and 55b and the flexible wiring board 69, the flexible wiring board 69 is deformed to a state different from the original manufacturing state while the rotary solenoid 10 is used for a long period of time, and accordingly the terminals 55a and 55b. May be deformed, causing torsion, poor insulation due to contact, or disconnection. Accordingly, the protection plate 56 is provided to prevent the terminals 55a and 55b from being deformed. In order to prevent the protection plate 56 from moving, a tongue-like protrusion may be formed on one of the edges of the protection plate 56, and this protrusion may be bonded to the inner peripheral surface of the case 51. Further, a rigid wiring board having the same shape may be provided in place of the protective plate 56, and a diode, a magnetic sensor, or the like may be provided on the rigid wiring board.

  4A and 4B are cross-sectional explanatory views (2) of the rotary solenoid according to the first embodiment of the present invention, in which FIG. 4A is a side view and FIG. 4B is a cross-sectional view taken along the line CC. In FIG. 4, 32b is a through-hole, and other code | symbol shows the same thing as FIG.1 and FIG.3. The flexible wiring board 69 is formed in a band shape and is accommodated in the recess 30 of the coil bobbin 20. In addition, the connecting land at one end of the flexible wiring board 69 is provided with the filaments of the coil 60 drawn into the inner peripheral surface 39 through the through holes 32a and 32b of the coil bobbin 20 shown in FIGS. 5 and 4B. Are soldered (the soldering portion is not shown). Furthermore, although not shown, the tip ends of the terminals 55a and 55b are soldered to the connection land at the other end of the flexible wiring board 69. The portion between the connecting lands on both ends is arranged in a state substantially along the inner peripheral surface 39 of the coil bobbin 20, but the vicinity of the terminals 55a and 55b is so as to surround the terminals 55a and 55 in a spiral shape. Has been placed. Therefore, when the coil bobbin 20 is rotated, the side connected to the wire constituting the coil 60 moves as it rotates, but the vicinity of the terminals 55a and 55b is a helical play, so that the terminals 55a and 55b Strong tension does not work.

  The shaft 70 is gradually reduced in diameter in the order of the distal end portion 73, the intermediate portion 72, and the proximal end portion 71. Further, the shaft 70 is supported in a state in which the intermediate portion 72 is rotatable to the left and right by the structural support body 40 through the ball bearing 68 and the internal fixed magnetic pole 41 through the ball bearing 67. Further, as described above, the screw hole 74 is formed at the tip of the shaft 70, and the shaft 70 is fixed to the coil bobbin 20 by the screw 64 and washers 65 and 66. Therefore, since the shaft 70 is firmly supported by the two ball bearings that serve as bearings, even if the coil bobbin 20 is connected to the tip 73, the rotation unevenness and the swing due to the inertia moment of the coil bobbin 20 are reduced. be able to. The shaft 70 in the present embodiment operates regardless of whether the material is magnetic or nonmagnetic. In particular, when a large torque is required, a magnetic material is preferably used, and electromagnetic stainless steel is particularly preferable.

  Next, the operation of the rotary solenoid 10 according to the first embodiment of the present invention will be described. FIG. 8 is a perspective view (1) showing the operation of the rotary solenoid according to the first embodiment of the present invention. FIG. 9 is a perspective view (2) showing the operation of the rotary solenoid according to the first embodiment of the present invention. Further, FIG. 10 is a cross-sectional view showing the relationship between the energization direction and the rotation direction. The reference numerals used in FIGS. 8, 9 and 10 are the same as those in FIGS. In FIG. 10, hatching is omitted.

  FIG. 8 corresponds to FIG. 3 and FIG. That is, the vertical line 62a and the vertical line 62b of the coil 60 are located near the side ends of the permanent magnet 50a and the permanent magnet 50b, respectively. Further, the distal ends of the stopper 75a and the stopper 75b are in contact with the edges of the guide hole 26a and the guide hole 26b of the coil bobbin 20, respectively. Here, when the coil 60 is energized and a current flows in the vertical line 62 and the vertical line 62b in the direction shown in FIG. 10, a flow of charged particles is generated in the vicinity of the permanent magnets 50a and 50b. A Lorentz force on the flow is generated.

Then, as shown in FIG. 10, a counterclockwise force is applied to the coil 60, and the vertical filament 62 a passes through the outer peripheral side of the permanent magnet 50 b toward the permanent magnet 50 a, and the vertical filament 62 b extends to the outer periphery of the permanent magnet 50 a. Rotate through the side toward the permanent magnet 50b . At this time, the shaft 70 also rotates integrally with the coil bobbin 20. Further, the end of the flexible wiring board 69 on the side where the coil 60 is soldered also rotates in the same manner. However, since a spiral play is provided in the vicinity of the terminals 55a and 55b, strong tension is applied to the terminals 55a and 55b. Will not work. When the coil bobbin 20 is rotated to the predetermined angle shown in FIG. 9, the leading ends of the stopper 75a and the stopper 75b come into contact with the opposite edges of the guide hole 26a and the guide hole 26b of the coil bobbin 20, respectively. Stops.

  In the state where the coil bobbin 20 is fully rotated, when a current is passed in the direction opposite to that shown in FIG. 10, Lorentz force that moves the coil bobbin 20 in the opposite direction acts, so that a clockwise force acts on the coil bobbin 20. Therefore, the coil bobbin 20 rotates reversely to the original position shown in FIG. 8, that is, the angle (direction) at which the distal ends of the stoppers 75a and 75b abut against the edges of the guide holes 26a and 26b of the coil bobbin 20, respectively. .

  Note that when the coil bobbin 20 is rotated in reverse, a means other than the means for flowing current in the reverse direction may be employed. For example, means such as a string spring provided inside or outside the case 51 may be provided so that the shaft 70 and the coil bobbin 20 are rotated in the reverse direction. In this manner, when the coil bobbin 20 is rotated to the angle shown in FIG. 9 and the energization of the coil 60 is stopped, the coil bobbin 20 returns to the original angle by the action of a means such as a string spring. .

  As described above, the rotary solenoid 10 according to the first embodiment is configured to rotate integrally with the shaft 70, and the permanent magnets 50 a and 50 b are disposed inside the substantially cylindrical coil bobbin 20. In addition, the permanent magnets 50a and 50b and the vertical line 62a and the vertical line 62b of the coil 60 are opposed to each other with a very narrow gap, and the magnetic circuit is composed only of the permanent magnets 50a and 50b, the case 51, and the internal fixed magnetic pole 41. Since it is configured, magnetic flux leakage to the surrounding space is reduced, and the generated magnetic flux can be efficiently converted into torque. In addition, components such as the internal fixed magnetic pole 41 are arranged in the internal space of the coil bobbin 20, and it is not necessary to provide a large gap inside the case 51. Therefore, this configuration is extremely suitable for reducing the size of the rotary solenoid. In addition, since the ball bearings 67 and 68 are provided between a fixed component such as the internal fixed magnetic pole 41 and a movable component such as the coil bobbin 20, the torque attenuation due to the frictional resistance can be reduced. It becomes possible. Further, since the coil bobbin 20 is fixed to the shaft 70 firmly held by the ball bearings 67 and 68, it can be reduced that the torque is attenuated due to the coil bobbin 20 coming into contact with a peripheral object during the rotation. Further, since the configurations of the coil bobbin 20 and the coil 60 are arranged so as to be point-symmetric with respect to the central axis of the shaft 70, there is no unbalanced configuration such that the mass is concentrated at a specific point. Therefore, it is possible to reduce the swing of the coil bobbin 20 due to the unbalanced configuration while the coil bobbin 20 is rotating. Therefore, the rotary solenoid 10 can be easily downsized and has a structure suitable for obtaining a high torque at the same time.

[Second Embodiment]
Hereinafter, a rotary solenoid according to a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 6 is a perspective view showing a coil bobbin of a rotary solenoid according to the second embodiment of the present invention. In FIG. 6, reference numeral 38 denotes a slit, and other reference numerals are the same as those in FIG. FIG. 7 is a cross-sectional view showing a rotary solenoid according to the second embodiment of the present invention. The reference numerals used in FIG. 7 are the same as those in FIG.

  The rotary solenoid 10 according to the second embodiment uses a slit 38 instead of a vertical groove 28 between the vertical frame 22 a and the vertical frame 22 b of the coil bobbin 20. The vertical frame 34a and the vertical frame 34b have the same configuration. Therefore, in this embodiment, the vertical line 62a and the vertical line 62b of the coil 60 are opposed to the permanent magnet 50a and the permanent magnet 50b in an exposed state. Other configurations are the same as those of the rotary solenoid 10 according to the first embodiment. Therefore, this embodiment is suitable for a rotary solenoid in which the number of turns of the coil 60 is not so large and the possibility that the filaments bulge toward the permanent magnet 50a and the permanent magnet 50b side is low.

  As described above, in the rotary solenoid 10 according to the second embodiment, the vertical line 62a and the vertical line 62b of the coil 60 have only a very narrow space between the permanent magnet 50a and the permanent magnet 50b. Since this structure is adopted, these gaps can be narrowed to the limit, and magnetic flux leakage can be further reduced. Therefore, it is possible to reduce the size similarly to the rotary solenoid 10 according to the first embodiment, and it is possible to obtain a larger torque.

[Third Embodiment]
Hereinafter, a rotary solenoid according to a third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 11 is a perspective view showing a permanent magnet and its peripheral structure of a rotary solenoid according to a third embodiment of the present invention. In FIG. 11, 50 is a permanent magnet, and other symbols are the same as those in FIG. FIG. 12 is a cross-sectional view showing the relationship between the energization direction and the rotation direction. The reference numerals used in FIG. 12 are the same as those in FIGS. In FIG. 12, hatching is omitted.

  The rotary solenoid 10 according to the third embodiment is provided with a permanent magnet 50 in place of the permanent magnets 50a and 50b of the first embodiment. That is, the permanent magnet 50 is formed in a substantially cylindrical shape having no bottom and is fitted between the vertical frame 22a and the vertical frame 22b. Further, the outer peripheral surfaces of the vertical frames 22a and 22b are bonded to the inner peripheral surface of the permanent magnet. The thickness of the permanent magnet 50 is the same as that of the permanent magnets 50 a and 50 b in FIG. 1, and a slight gap is provided between the permanent magnet 50 and the coil bobbin 20. Further, as shown in FIG. 12, the permanent magnet 50 is magnetized so that the portion in the vicinity of the vertical stripe 62a is an N pole and the portion in the vicinity of the vertical stripe 62b is an S pole. The configuration of other parts is the same as that of the first embodiment. Accordingly, when the coil 60 is energized, the outer peripheral side of the permanent magnet 50 has the same polarity as the permanent magnets 50a and 50b, and therefore rotates in the direction of the arrow in FIG. 12 as in the first embodiment.

  In this embodiment, the volume of the permanent magnet increases, but there is an advantage that a larger torque can be obtained. In this embodiment, in order to prevent generation of an unnecessary magnetic circuit that short-circuits the permanent magnet 50 and the support portions 42a and 42b, it is highly desirable that the structural support 40 be formed of a nonmagnetic material. .

[Fourth Embodiment]
Hereinafter, a rotary solenoid according to a fourth embodiment of the present invention will be described in detail with reference to the drawings. FIG. 13 is a perspective view showing a permanent magnet of a rotary solenoid and its peripheral structure according to a third embodiment of the present invention. FIG. 14 is a cross-sectional view showing the relationship between the energization direction and the rotation direction. The reference numerals used in FIGS. 13 and 14 are the same as those in FIGS. 11 and 12. In FIG. 14, hatching is omitted.

  The rotary solenoid 10 according to the fourth embodiment is provided with a permanent magnet 50 in place of the fixed internal magnetic pole 41 and the permanent magnets 50a and 50b of the first embodiment. That is, the permanent magnet 50 is formed in a shape that combines the fixed internal magnetic pole 41 and the permanent magnets 50a and 50b in the first embodiment, and is fitted between the support portion 42a and the support portion 42b. Further, as shown in FIG. 14, the permanent magnet 50 is magnetized so that the portion in the vicinity of the vertical stripe 62a is an N pole and the portion in the vicinity of the vertical stripe 62b is an S pole. The configuration of other parts is the same as that of the first embodiment. Therefore, when the coil 60 is energized, the outer peripheral side of the permanent magnet 50 has the same polarity as the permanent magnets 50a and 50b, and the permanent magnet 50 also functions as an internal fixed magnetic pole. Therefore, as in the first embodiment. It rotates in the direction of the arrow in FIG.

  In this embodiment, the volume of the permanent magnet is increased, and it is necessary to select a material that does not crack or chip when fitted between the vertical frame 22a and the vertical frame 22b. There is an advantage that a large torque can be obtained. In this embodiment, in order to prevent generation of an unnecessary magnetic circuit that short-circuits the permanent magnet 50 and the support portions 42a and 42b, it is highly desirable that the structural support 40 be formed of a nonmagnetic material. .

  The present invention is not limited to the above-described contents, and details of the shape of the coil bobbin, case, end cap or structural support, and the winding order of the metal filaments on the coil bobbin, etc. Various modifications can be made without departing from the scope of the claims. In addition, the modification of each part described when describing the configuration of the rotary solenoid according to each embodiment can be preferably applied to the rotary solenoids according to other embodiments as long as no structural contradiction occurs.

It is a disassembled perspective view of the rotary solenoid which concerns on 1st Example of this invention. It is a perspective view which shows the rotary solenoid which concerns on 1st Example of this invention, (a) is a perspective view by the side of a terminal, (b) is a perspective view by the side of a shaft front end. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional explanatory drawing (1) of the rotary solenoid which concerns on 1st Example of this invention, (a) is a front view, (b) is an AA sectional view, (c) is a BB sectional drawing. It is. It is sectional explanatory drawing (2) of the rotary solenoid which concerns on 1st Example of this invention, (a) is a side view, (b) is CC sectional view taken on the line. It is a perspective view which shows the coil bobbin which concerns on 1st Embodiment. It is a perspective view which shows the coil bobbin of the rotary solenoid which concerns on the 2nd Example of this invention. It is a cross-sectional view which shows the rotary solenoid which concerns on the 2nd Example of this invention. It is a perspective view (1) which shows operation | movement of the rotary solenoid which concerns on the 1st Embodiment of this invention. It is a perspective view (2) which shows operation | movement of the rotary solenoid which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the relationship between an electricity supply direction and a rotation direction. It is a perspective view which shows the permanent magnet of the rotary solenoid which concerns on 3rd Example of this invention, and its periphery structure. It is sectional drawing which shows the relationship between an electricity supply direction and a rotation direction. It is a perspective view which shows the permanent magnet of the rotary solenoid which concerns on 3rd Example of this invention, and its periphery structure. It is sectional drawing which shows the relationship between an electricity supply direction and a rotation direction.

Explanation of symbols

10 Rotary solenoid 20 Coil bobbin 21 Upper frame 22a Vertical frame 22b Vertical frame 23 Lower frame 24 Shaft fixing portion 25 Screw hole 26a Guide hole 26b Guide hole 27 Upper circumferential groove 28 Vertical groove 29 Lower circumferential groove 30 Recess 31a Notch 31b Notch 32a Through hole 32b Through-hole 33 Tapered surface 34a Vertical frame 34b Vertical frame 35 Top plate part 36 Inner peripheral surface 37a Notch 37b Notch 38 Slit 39 Inner peripheral surface 40 Structure support 41 Internal fixed magnetic pole 42a Support part 42b Support part 43 End cap part 44 Through Hole 45a Stopper fitting hole 45b Stopper fitting hole 46 Bearing fitting hole 47 Inner peripheral surface 48 Inner peripheral surface 49 Step surface 50 Permanent magnet 50a Permanent magnet 50b Permanent magnet 51 Case 52 Opening 53 End cap 54a Terminal hole 54b Terminal hole 55a terminal 55b terminal 56 protective plate 57 opening 8a terminal hole 58b terminal hole 59 recess 60 coil 61 upper wire 62 vertical wire 62a vertical wire 62b vertical wire 63 lower wire 64 screw 65 washer 66 washer 67 ball bearing 68 ball bearing 69 flexible wiring board 70 shaft 71 base End portion 72 Intermediate portion 73 Tip portion 74 Screw hole 75a Stopper 75b Stopper

Claims (9)

A coil bobbin formed in a substantially cylindrical shape;
A first permanent magnet and a second permanent magnet disposed inside the coil bobbin;
A coil formed by winding a metal wire around the coil bobbin;
In a rotary solenoid that is provided integrally with the coil bobbin and that has a rotatable shaft,
The coil bobbin is formed on the outer peripheral surface so that the first vertical groove and the second vertical groove face each other,
The first permanent magnet is disposed in the vicinity of a portion of the inner peripheral surface of the coil bobbin facing away from the first vertical groove, and the second permanent magnet is the second permanent magnet on the inner peripheral surface of the coil bobbin. And the magnetizing direction of the first permanent magnet and the second permanent magnet is opposite to each other.
In the coil, a part of the wire is wired inside the first vertical groove and the second vertical groove of the coil bobbin, and inside the first vertical groove when the coil is energized. A rotary solenoid characterized in that a current flowing through a wired portion and a current flowing through a portion wired inside the second vertical groove are in opposite directions.   Further, the coil bobbin is disposed so as to be interposed between the first permanent magnet and the second permanent magnet, is formed in a substantially cylindrical shape, and a part of the shaft is disposed inside the coil bobbin. The rotary solenoid according to claim 1, further comprising an inserted internal fixed magnetic pole. A coil bobbin formed in a substantially cylindrical shape;
A permanent magnet formed in a substantially cylindrical shape and disposed inside the coil bobbin;
A coil formed by winding a metal wire around the coil bobbin;
In a rotary solenoid having a shaft that is provided integrally with the coil bobbin and that is rotatable to the left and right,
The coil bobbin is formed on the outer peripheral surface so that the first vertical groove and the second vertical groove face each other,
The permanent magnet is disposed in the vicinity of a portion where the first polar portion faces away from the first vertical groove on the inner peripheral surface of the coil bobbin, and the second polar portion is disposed on the inner peripheral surface of the coil bobbin. It is arranged in the vicinity of the part facing away from the vertical groove of 2,
In the coil, a part of the wire is wired inside the first vertical groove and the second vertical groove of the coil bobbin, and inside the first vertical groove when the coil is energized. A rotary solenoid characterized in that a current flowing through a wired portion and a current flowing through a portion wired inside the second vertical groove are in opposite directions.   The rotary solenoid according to claim 3, further comprising an internal fixed magnetic pole disposed inside the permanent magnet and having at least a part of a side surface in contact with the permanent magnet. The coil bobbin has an upper circumferential groove formed so as to circulate on an outer peripheral surface and to be connected to upper ends of the first vertical groove and the second vertical groove;
2. A lower circumferential groove formed so as to circulate around an outer peripheral surface and to be connected to lower ends of the first vertical groove and the second vertical groove. The rotary solenoid according to claim 1.   In the coil bobbin, instead of the first vertical groove and the second vertical groove, a first slit and a second slit are formed so as to extend in a vertical direction at opposing portions of the outer peripheral surface. The rotary solenoid according to any one of claims 1 to 5, wherein the rotary solenoid is provided. The coil bobbin has an upper circumferential groove formed so as to circulate on an outer peripheral surface and to be connected to upper end portions of the first slit and the second slit;
The lower circumference groove formed so that it may go around an outer peripheral surface and may connect with the lower end part of the 1st slit and the 2nd slit, It is characterized by the above-mentioned. Rotary solenoid. The coil bobbin is formed in a bottomed cylindrical shape having a bottom on the base end side of the shaft, and a substantially arc-shaped slit is formed in the bottom.
The shaft has a proximal end fixed to the bottom of the coil bobbin,
8. The stopper according to claim 1, further comprising a stopper that is formed in a substantially rod shape and is held in a state in which a distal end side is inserted into the slit of the bottom portion of the coil bobbin. Rotary solenoid.   The rotary solenoid according to claim 2 or 4, further comprising a bearing in which an outer ring is fitted to an inner peripheral surface of the inner fixed magnetic pole, and the shaft is fitted to the inner ring.

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