JP2011146487A - Solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid having a structure that can be easily and effectively assembled without using a jig and maintain the assembled state more surely. <P>SOLUTION: A holding tube part 14 is inserted in the opening part 34 of a first pinching plate part 32, and a second pinching plate part 33 is positioned between a first holding plate part 15 and a second holding plate part 16. Between the first pinching plate part 32 and the second pinching plate part 33, a winding core part 11, a first flange part 12, and a second flange part 13 are placed. By inserting a permanent magnet 48 and a base 45 between the second flange part 13 and the second pinching plate part 33, assembly can be easily done only by manual operation. Even when an impact is applied from the outside, projecting parts 17 and 18 of a coil bobbin 10 are engaged in notched parts 47a and 47b to prevent the separation of the base 45. Moreover, the permanent magnet 48 is in contact with the base 45 and the second pinching plate part 33 and an attractive force is exerted between the base 45 and the second pinching plate part 33 by the permanent magnet 48, so that the permanent magnet 48 is not separated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solenoid, and more particularly to a solenoid having a structure suitable for assembling without using a jig in a yoke.

  A solenoid having a yoke, which is a substantially U-shaped frame-type magnetic pole, includes a coil, a coil bobbin, a movable magnetic pole, a base and the like in addition to the yoke. Since this type of solenoid can be made relatively simple, it is suitable for miniaturization and is used in various devices.

  By the way, in the solenoid having a yoke, various structures have been proposed in order to improve workability during assembly. FIG. 15 is a perspective view showing the structure of a solenoid according to the prior art. In FIG. 15, 90 is a solenoid, 91 is a yoke, 92 is a coil bobbin, 93 is a coil, 94 is a movable magnetic pole, 95 is a fixed magnetic pole, 96a and 96b are engaged parts, 97 is an engaging part convex part, and 98 is attached. The members, 98a and 98b are locking claws, 99 is a guide groove, and 99a and 99b are locking portions.

  FIG. 15 shows a solenoid disclosed in Japanese Patent Application Laid-Open No. 2001-291612. In this conventional example, assembly is performed according to the following procedure. That is, the fixed magnetic pole 95 is inserted into the coil bobbin 92 around which the coil 93 is wound. When the engaged portions 96a and 96b are arranged in a series, the fixed magnetic pole 95 is housed integrally without protruding from the coil bobbin 92. Next, the engaging portion convex portion 97 and the attachment member 98 are inserted into the engaged portions 96a and 96b and the guide groove 99 of the yoke 91, respectively, and the coil bobbin 92 is slid. When the coil bobbin 92 is in a predetermined position, the locking claws 98a and 98b are engaged with the locking portions 99a and 99b. Finally, the movable magnetic pole 94 is inserted into the coil bobbin 92. According to this structure, the coil bobbin 92 can be fixed to the yoke 91 manually without using a jig. Further, since the engaged portions 96 a and 96 b are restrained by the engaging portion convex portion 97, the fixed magnetic pole 95 is also fixed to the coil bobbin 92 and the yoke 91.

  However, in the above structure, if the dimensional accuracy of the coil bobbin 92 and the yoke 91 is not high, the engagement state between the locking claws 98a and 98b and the locking portions 99a and 99b becomes insufficient, and the solenoid 90 is used from the outside during use. In some cases, the coil bobbin 92 is detached from the yoke 91 or the coil bobbin 92 is inclined to cause a deviation in the sliding direction of the movable magnetic pole 94. There is a case. Further, when the coil bobbin 92 is deteriorated during long-term use or vibration is applied for a long time, the locking claws 98a and 98b move in a direction away from the locking portions 99a and 99b, and the coil bobbin 92 is tilted. There is also.

JP 2001-291612 A

  In order to solve the above-described problems, an object of the present invention is to provide a solenoid having a structure that can be easily and efficiently assembled without using a jig and that can maintain the assembled state more reliably.

  The invention according to claim 1 is a core portion formed in a substantially cylindrical shape, and substantially plate-like first and second flange portions respectively provided at both ends of the core portion, A substantially plate-shaped first holding plate portion and a second holding plate portion provided so as to extend in parallel with the central axis of the core portion from two opposing edges of the second flange portion or in the vicinity thereof; A coil bobbin provided with a movable magnetic pole inserted into the core portion and slidable along a central axis of the core portion, the first holding plate portion and the second holding portion A base disposed between the plate portion and a position where the movable magnetic pole can be contacted; and a base disposed between the first holding plate portion and the second holding plate portion, and the base. A permanent magnet provided in contact with the coil, a yoke provided so as to sandwich the coil bobbin, the base and the permanent magnet; A solenoid, characterized in that it comprises a coil wound around Kimakishin unit.

  According to a second aspect of the present invention, in the first aspect of the present invention, the coil bobbin has at least one protruding from a surface of the second flange portion where the opening of the core portion is exposed. The base is further provided, and the base is disposed so that the first surface is in contact with the surface of the second flange portion on the side where the opening of the core portion is exposed, and corresponds to the protrusion. A solenoid is characterized in that a notch or an opening is formed in a part and the projection is accommodated in the notch or the opening.

  The invention according to claim 3 is the invention according to claim 2, wherein the coil bobbin is parallel to the central axis of the core portion from the periphery of the opening portion of the core portion exposed to the first flange portion. A substantially cylindrical holding cylinder portion provided to extend; and the permanent magnet is disposed such that a first surface is in contact with a second surface facing away from the first surface of the base; The yoke is provided so as to be in contact with a substrate portion formed in a substantially plate shape and a surface of the core portion of the first flange portion where the opening is exposed at an edge of the substrate portion. An opening is provided in the vicinity thereof, and the first holding plate portion having a substantially plate shape in which the holding cylinder portion is inserted into the opening portion, and the first holding plate holding portion on the other edge of the substrate portion. And between the first holding plate portion and the second holding plate portion and the first of the permanent magnet. A substantially plate-shaped second sandwiching plate portion disposed so as to contact the second surface facing away from the surface, wherein the first sandwiching plate portion and the second sandwiching plate portion are the coil bobbins, A solenoid characterized by sandwiching the base and the permanent magnet.

  The invention according to claim 4 is the invention according to claim 3, wherein the coil bobbin has a length in the central axis direction of the core portion of the holding cylinder portion equal to or greater than a thickness of the permanent magnet, and The solenoid is less than the sum of the thickness of the base and the thickness of the permanent magnet.

  According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects of the present invention, the coil bobbin has the protrusion portion having the second flange portion and the first holding plate portion. Two solenoids are provided so as to straddle each of the second holding plate portions.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the coil bobbin is at least one of the first holding plate portion and the second holding plate portion. One end of the coil of the coil protrudes from the surface facing one of the second flanges, and a groove or a through hole is provided so as to extend in parallel with the central axis of the core, and the groove Alternatively, the solenoid is characterized in that a portion near the end of the winding of the coil is wired inside the through hole.

  The invention according to claim 7 is the invention according to claim 6, wherein the coil bobbin is provided with the grooves on the upper end side and the lower end side of the first holding plate portion and the second holding plate portion, respectively. And between the groove on the upper end side of the first holding plate portion and the groove on the lower end side of the first holding plate portion, and the groove on the upper end side of the second holding plate portion and the first The through holes are respectively provided between the two holding plate portions and the groove on the lower end side thereof, and are electrically connected to the through holes and project from the surface facing the second flange portion. Each of the rods is provided, and a portion of the coil near the end of the winding is wound around the rod.

  According to an eighth aspect of the present invention, in the invention according to any one of the second to seventh aspects, the base is a fold formed so as to extend from the upper end portion along the upper end surface of the permanent magnet. A solenoid further comprising a curved portion.

  According to the invention described in claim 1, the permanent magnet and the base are arranged between the first holding plate portion and the second holding plate portion, and the coil bobbin, the base and the permanent magnet are sandwiched by the yoke. Therefore, when the coil bobbin, the base and the permanent magnet are sandwiched by the yoke, the base and the permanent magnet can be held in an appropriate position, and the base or the permanent magnet can be prevented from escaping to the side and failing to be sandwiched. The solenoid can be assembled efficiently.

  According to the second aspect of the present invention, even if an impact is applied from the outside with a slight gap between the first holding plate portion and the second holding plate portion and the permanent magnet and the base, the coil bobbin Since the protruding portion of the base is within the notch or opening of the base, the protruding portion locks the base to prevent the base from being detached. Further, since the permanent magnet is assembled in contact with the base and the second holding plate portion, and the permanent magnet and the base and the second holding plate portion are attracted to each other, the permanent magnet can be detached. Can be prevented.

  According to the third aspect of the present invention, since the holding cylinder part of the coil bobbin is inserted into the opening of the first clamping plate part, the opening locks the holding cylinder part and the first flange of the coil bobbin. The part side separation can also be prevented.

  According to invention of Claim 4, when a permanent magnet is inserted between the 2nd collar part and the 2nd clamping board part, a coil bobbin is pressed against a permanent magnet, ie, a holding cylinder part is made into the 1st clamping board. The inserted state of the holding cylinder part is maintained even if the holding cylinder part is moved in the direction to be detached from the opening of the part. Therefore, once the permanent magnet is inserted, the coil bobbin is not detached from the yoke, and the assembling work is facilitated.

  According to the invention described in claim 5, the two protrusions provided so as to straddle the second flange portion, the first holding plate portion, and the second holding plate portion are the tip portions of the two holding plate portions. It becomes a reinforcing material against stress that keeps them apart. Accordingly, when the base and the permanent magnet are inserted or after the insertion, the deformation of the two holding plate portions can be reduced, and the assembled state of the solenoid can be maintained more reliably.

  According to the sixth aspect of the invention, the fixing work near the end of the coil wire constituting the coil is facilitated.

  According to the seventh aspect of the present invention, since the vicinity of the end of the coil winding can be wired to both the upper end side and the lower end side of the first holding plate portion and the second holding plate portion, It is not necessary to distinguish between the vertical direction and the assembly work becomes easy. At the same time, the fixing work near the end of the coil wire constituting the coil is facilitated.

  According to the eighth aspect of the present invention, when the base is pushed between the second flange portion and the permanent magnet, the bent portion comes into contact with the upper end surface of the permanent magnet. It is possible to prevent the base from being pushed in excessively so as to separate again after entering the notch or opening of the base.

It is explanatory drawing (1) of the solenoid which concerns on embodiment of this invention, (A) is a front view, (B) is a top view, (C) is a right view, (D) is a left view. It is explanatory drawing (2) of the solenoid which concerns on embodiment of this invention, (A) is sectional drawing in the AA line, (B) is sectional drawing in the BB line. It is explanatory drawing (1) of a coil bobbin, (A) is a front view, (B) is a top view, (C) is a right view, (D) is a left view. It is explanatory drawing (2) of a coil bobbin, (A) is sectional drawing in CC line, (B) is sectional drawing in DD line. It is a top view which shows the winding state of the coil around a coil bobbin. It is explanatory drawing (1) of a yoke, (A) is a front view, (B) is a top view, (C) is a right view, (D) is a left view. It is explanatory drawing (2) of a yoke, (A) is sectional drawing in the EE line, (B) is sectional drawing which shows arrangement | positioning to a coil bobbin and a permanent magnet yoke, (C) is a yoke and a coil bobbin. It is sectional drawing which shows length relationship. It is explanatory drawing of a movable magnetic pole, (A) is a front view, (B) is a right view, (C) is a left view. It is explanatory drawing of a base, a permanent magnet, and a ring, (A) is a right view of a base, (B) A front view of a base, (C) is a right view of a permanent magnet, (D) is a front view of a permanent magnet. , (E) is a right side view of the ring, and (F) is a front view of the ring. It is explanatory drawing of the operation state of a solenoid, (A) is a state at the time of attraction | suction of a movable magnetic pole, (B) is a non-energized state, (C) is a state at the time of the repulsion of a movable magnetic pole. It is explanatory drawing (1) of the assembly procedure of a solenoid, (A) And (B) is the attachment procedure of a coil bobbin, (C) is the attachment procedure of a permanent magnet. It is explanatory drawing (2) of the assembly procedure of a solenoid, (D) and (E) are the attachment procedure of a base, (F) is the attachment procedure of a movable magnetic pole. It is explanatory drawing (1) of the modification of the solenoid which concerns on embodiment of this invention, (A) is a top view, (B) is a right view. It is explanatory drawing (2) of the modification of the solenoid which concerns on embodiment of this invention, (A) is a top view, (B) is a right view, (C) is a right view of a base, (D) is It is a right view of a permanent magnet. It is a perspective view which shows the structure of the solenoid which concerns on a prior art.

  A solenoid according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram (1) of a solenoid according to an embodiment of the present invention, where (A) is a front view, (B) is a plan view, (C) is a right side view, and (D) is a left side view. FIG. 2 is an explanatory view (2) of the solenoid according to the embodiment of the present invention, in which (A) is a cross-sectional view taken along the line AA, and (B) is a cross-sectional view taken along the line BB. In FIG. 1, 10 is a coil bobbin, 11 is a core part, 12 is a first collar part, 13 is a second collar part, 15 is a first holding plate part, 16 is a second holding plate part, 19a, 19b, 20a and 20b is a groove, 22 and 23 are through-holes, 24 is a coil, 25 and 26 are rod-shaped terminals, 30 is a yoke, 31 is a substrate portion, 32 is a first clamping plate portion, 33 is a second clamping plate portion, and 35 and 36 Is a fixed part, 37 and 38 are openings, 40 is a movable magnetic pole, 41 is a main body part, 42 is a tip part 42 is a constricted part, 45 is a base, 46 is a bent part, 48 is a permanent magnet, 49 is a washer, 50 Is a solenoid. The reference numerals used in FIG. 2 are the same as those in FIG. In addition, about the coil 24, description of the fine aspect which wound the filament repeatedly in each drawing including FIG. 1 is abbreviate | omitted, and is represented by the general external shape.

  First, based on FIG.1 and FIG.2, the schematic structure of the solenoid which concerns on embodiment of this invention, etc. are described. In the solenoid 50, the substantially cylindrical coil 24 is disposed between the first sandwiching plate portion 32 and the second sandwiching plate portion 33 of the substantially U-shaped yoke 30. Furthermore, a base 45 and a permanent magnet 48 are provided between the first clamping plate portion 32 and the second clamping plate portion 33 of the yoke 30, and the base 45 is disposed on the movable magnetic pole 40 side. The yoke 30 holds the coil bobbin 10, the base 45, and the permanent magnet 48 between the first holding plate portion 32 and the second holding plate portion 33. That is, the coil bobbin 10 and the first surface of the base 45 are in contact, the second surface of the base 45 is in contact with the first surface of the permanent magnet 48, and the second surface of the permanent magnet 48 is the second clamping plate. It is in contact with the portion 33. The coil 24 is wound around the core part 11 of the coil bobbin 10. Inside the core part 11, the movable magnetic pole 40 is arrange | positioned in the state which can be slid to the front-end | tip part 42 side or the other side. Therefore, when the movable magnetic pole 40 slides to the proximal end side, the proximal end portion of the movable magnetic pole 40 contacts the base 45.

  Both end portions of the coil 24 are wound around rod-like terminals 25 and 26 supported by the first holding plate portion 15 and the second holding plate portion 16 of the coil bobbin 10. The movable magnetic pole 40 constitutes a magnetic circuit with the yoke 30, the base 45 and the permanent magnet 48. The movable magnetic pole 40 is attracted to the base 45 by the magnetic flux of the permanent magnet 48 when the coil 24 is not energized and there is no load. Therefore, the solenoid according to this embodiment is a so-called self-holding solenoid. When the coil 24 is energized, the movable magnetic pole 40 is either separated from the base 45 or the movable magnetic pole 40 is instantaneously attracted to the base 45 depending on the direction of the current. Therefore, the main function of the solenoid 50 is to pull the movable part of the load device connected to the movable magnetic pole 40 instantaneously.

  Next, components of the solenoid 50 will be described. 3A and 3B are explanatory views (1) of the coil bobbin, in which (A) is a front view, (B) is a plan view, (C) is a right side view, and (D) is a left side view. 4A and 4B are explanatory views (2) of the coil bobbin, in which FIG. 4A is a cross-sectional view taken along the line C-C, and FIG. In FIG. 3, 12a is an outer side surface, 13 is a 2nd collar part, 13a is an outer side surface, 14 is a holding cylinder part, 17 and 18 are protrusion parts, 21 is a hollow part, 21a and 21b are opening parts. The reference numerals used in FIG. 4 are the same as those in FIGS.

  As shown in FIG. 3 and FIG. 4, the coil bobbin 10 is entirely made of resin, and is formed at the end portion of the core portion 11 formed in a substantially cylindrical shape and the tip end side of the movable magnetic pole 40 of the core portion 11. The substantially rectangular plate-shaped first collar 12 and the substantially rectangular plate-shaped second collar 13 formed at the proximal end of the movable magnetic pole 40 of the core 11 are provided. In addition, a substantially cylindrical holding cylinder portion 14 is formed around the opening 21 a of the outer side surface 12 a of the first flange portion 12. Further, a first holding plate portion 15 and a second holding plate portion 16 having a substantially rectangular plate shape are formed at the right end portion and the left end portion of the second flange portion 13. The coil bobbin 10 may be a nonmagnetic metal surface with an insulating coating formed thereon.

  The winding core 11 is used for winding the coil wire of the coil 24 around the outer peripheral surface and is the basis of the structure of the coil bobbin 10. Further, the hollow portion 21 of the core portion 11 serves as a holding portion / guide portion for sliding while holding the movable magnetic pole 40. In addition, the core part 11 may be formed in an elliptical cylinder shape, and may be formed in a polygonal cylinder shape. The first flange portion 12 and the second flange portion 13 are formed to be parallel to each other and orthogonal to the central axis of the core portion 11.

  Since the yoke 30 sandwiches the coil bobbin 10, the base 45, and the permanent magnet 48 in the assembled state of the solenoid 50, the outer surface 12a of the first flange 12 is lightly pressed against the first sandwiching plate 32, and the second The outer side surface 13 a of the flange 13 is in a state where it is lightly pressed against the base 45. The coil bobbin 10 shown in FIGS. 3 and 4 does not have a vertical direction, that is, the coil bobbin 10 can be used as it is even if the one shown in FIG. 3 is turned upside down, but the coil bobbin 10 has a vertical direction. In order to easily determine the directionality, the first heel part 12 or the second heel part 13 may be formed in another shape such as a baseball-shaped pentagon baseball with a sharp upper part. Further, a protrusion 17 and a protrusion 18 are formed on the right side and the left side of the opening 21b of the outer side surface 13a of the second flange 13, respectively.

  The holding cylinder part 14 is parallel to the central axis of the core part 11 in the direction facing away from the second flange part 13 from the periphery of the opening part of the core part 11 exposed at the center of the outer surface 12a. The inner peripheral surface thereof is formed so as to be continuous with the inner peripheral surface of the core part 11. In addition, the holding cylinder portion 14 is inserted into the opening portion of the first clamping plate portion 32 in the process of assembling the solenoid 50 so that the coil bobbin 10 is not easily detached from the yoke 30 to facilitate assembly. Have. Furthermore, even when the solenoid 50 is in use, it also has a role of preventing the coil bobbin 10 from being detached from the yoke 30 due to external vibration or impact. Therefore, as will be described in detail later, the length of the holding cylinder portion 14 extending from the outer surface 12a in parallel with the central axis of the core portion 11 needs to take these into consideration. Moreover, in this embodiment, although the thickness of the holding cylinder part 14 is made thinner than the thickness of the core part 11, this thickness can be changed suitably.

  The first holding plate portion 15 extends from the right end portion of the second flange portion 13 in a direction facing away from the first flange portion 12 and in parallel with the central axis of the core portion 11. Similarly, the second holding plate portion 16 extends from the left end portion of the second flange portion 13 in a direction facing away from the first flange portion 12 and in parallel with the central axis of the core portion 11. The holding plate portion 15 is arranged in parallel. In the assembled state of the solenoid 50, the base 45, the permanent magnet 48, and the second clamping plate portion 33 of the yoke 30 are located between the first holding plate portion 15 and the second holding plate portion 16. These are not fitted to the first holding plate portion 15 and the second holding plate portion 16. That is, these holding plate portions are disposed when the coil bobbin 10, the base 45 and the permanent magnet 48 are sandwiched between the first holding plate portion 32 and the second holding plate portion 33 of the yoke 30. In order to prevent the base or permanent magnet from escaping to the side and failing to pinch, the distance between the first holding plate 15 and the second holding plate 16 Are not so wide that the base 45, the permanent magnet 48, and the second sandwiching plate portion 33 between them are loose, and are set so as not to be so narrow as press-fitting.

  Further, a through hole 22 and a through hole 23 are formed in the first holding plate part 15 and the second holding plate part 16 so as to extend in parallel with the central axis of the core part 11. The through-hole 22 and the through-hole 23 have a role of fixing these rod-shaped terminals to the coil bobbin 10 by fitting the rod-shaped terminals 25 and the rod-shaped terminals 26 to each other. Further, the first holding plate portion 15 and the second holding plate portion 16 are formed with grooves 19a and 19b and grooves 20a and 20b on the upper end surface and the lower end surface, respectively. These grooves are for wiring a portion near the end of the coil 24 inside, and are formed in the same shape so as to extend in parallel with the central axis of the core 11. Since there are two coil wires to be wired, only the upper or lower one of the grooves 19a and 19b and the grooves 20a and 20b is actually used. However, in this embodiment, the vertical direction of the coil bobbin 10 is eliminated by forming grooves in the upper end surface and the lower end surface of the first holding plate portion 15 and the second holding plate portion 16, so that the operator mistakes. By attaching the coil bobbin 10 upside down, work efficiency is prevented from being lowered. Note that the grooves 19a, 19b, 20a and 20b, or the through holes 22 and 23 are not formed, and the rod-like terminals 25 and 26, or the portions near the ends of the coil 24 are provided in the first holding plate 15 and the second holding plate. Although it is possible to affix to the side surface of the plate part 16 with an adhesive, considering the strength as an external connection terminal, etc., the grooves 19a, 19b, 20a and 20b or the through holes 22 and 23 are provided. Is desirable. Further, instead of the grooves 19a and 19b and the grooves 20a and 20b, through holes for wiring may be provided in the first holding plate portion 15 and the second holding plate portion 16.

  When the solenoid 50 is assembled, the protrusions 17 and 18 lock the base 45 by entering into the spaces of the notches 47a and 47b of the base 45 shown in FIG. Further, as shown in FIG. 4A, the protrusion 17 and the protrusion 18 are formed so as to straddle not only the second flange 13 but also the first holding plate 15 and the second holding plate 16. Has been. By the way, when the base 45 and the permanent magnet 48 are inserted into the gap between the first holding plate portion 15 and the second holding plate portion 16 and the dimensional accuracy is not sufficient, the front end portion of the first holding plate portion 15 and the 2 These holding plate portions may be slightly deformed so that the tip end portion of the holding plate portion 16 opens. If it deform | transforms in this way, the stress which bends these will always be added to the base end part of the 1st holding plate part 15, and the base end part of the 2nd holding plate part 16. FIG. Therefore, the protrusions 17 and 18 are formed so as to straddle the second flange 13 and the two holding plate portions so as to function as reinforcing ribs. When the first holding plate 15 and the second holding plate 16 are sufficiently strong, the protrusions 17 and 18 may be formed only on the outer surface 13a of the second flange 13. Furthermore, when it is not required to lock the base 45, only one protrusion may be formed near the center of the outer surface 13a.

  FIG. 5 is a plan view showing a winding state of the coil around the coil bobbin. In FIG. 5, 24a and 24b are derivation lines, and other reference numerals are the same as those in FIG. As shown in FIG. 5, the coil 24 is formed by winding a coil wire around the core portion 11. Furthermore, the lead-out line 24a and the lead-out line 24b, which are portions in the vicinity of the end of the coil 24, are wired to the groove 19a and the groove 20a, respectively. In addition, the portions closer to the tip of the lead wires 24a and 24b are wound around the rod-like terminal 25 and the rod-like terminal 26, respectively, and are fixed to these rod-like terminals by solder (not shown).

  6A and 6B are explanatory views (1) of the yoke, in which (A) is a front view, (B) is a plan view, (C) is a right side view, and (D) is a left side view. 7 is an explanatory view (2) of the yoke, (A) is a sectional view taken along line E-E, (B) is a sectional view showing the arrangement of the coil bobbin and the permanent magnet on the yoke, and (C ) Is a sectional view showing the length relationship between the yoke and the coil bobbin. In FIG. 6, reference numeral 34 denotes an opening, and other reference numerals are the same as those in FIG. Reference numerals used in FIG. 7 are the same as those in FIGS. 1 and 6.

  The yoke 30 is one of the fixed magnetic poles constituting the magnetic circuit, and serves to maintain the entire structure of the solenoid 50 by sandwiching other components and as a base material fixed to other devices. Together with the role. The yoke 30 is formed by processing one magnetic metal plate, and the substrate portion 31, the first sandwiching plate portion 32, and the second sandwiching plate portion 33 are formed by bending the metal plate. The yoke 30 may be formed by integrating a plurality of magnetic metal plates by a method such as caulking. Alternatively, another magnetic metal plate may be caulked and attached to the yoke 30 to form a substantially rectangular fixed magnetic pole with the yoke 30 and this metal plate.

  The substrate portion 31 is a fixed magnetic pole that constitutes a magnetic circuit, and is also a base material that is fixed to another device. That is, the whole is formed in a substantially rectangular plate shape, and the fixing portions 35 and 36 are formed so as to protrude from the vicinity of the center of the two edges in the longitudinal direction of the substrate portion 31. An opening 37 and an opening 38 are formed in the fixing portion 35 and the fixing portion 36 for screwing, respectively. The substrate portion 31 may have another shape such as an elliptical plate shape or a polygonal plate shape as long as there is no problem in configuring the magnetic circuit. Moreover, you may change suitably the site | part which forms the opening part 37 and the opening part 38. FIG.

  The first clamping plate portion 32 has an opening 34 at the center for holding the coil bobbin 10. The diameter of the opening 34 is set slightly larger than the outer diameter of the holding cylinder 14 of the coil bobbin 10 so that the holding cylinder 14 inserted into the opening 34 does not rattle. Further, the first sandwiching plate portion 32 is formed to face the second sandwiching plate portion 33, and sandwiches the coil bobbin 10, the base 45, and the permanent magnet 48 together with the second sandwiching plate portion 33 as described above. ing. The second sandwiching plate portion 33 has the same outer shape as the first sandwiching plate portion 32, but has no opening, and only serves to sandwich the coil bobbin 10, the base 45, and the permanent magnet 48.

  By the way, the gap between the first clamping plate portion 32 and the second clamping plate portion 33 is formed from the outer side surface 12a of the first flange portion 12 to the second flange portion 13 in order to clamp the coil bobbin 10, the base 45, and the permanent magnet 48. Is set to be substantially the same as the sum of the length to the outer side surface 13a and the thickness of the base 45 and the permanent magnet 48. Further, when the solenoid 50 is assembled, the core part 11, the first collar part 12, the second collar part 13, and the holding cylinder part 14 of the coil bobbin 10 are interposed between the first clamping plate part 32 and the second clamping plate part 33. It is necessary to insert. Therefore, as shown in FIG. 7C, the length from the tip end of the holding cylinder portion 14 of the coil bobbin 10 to the outer side surface 13 a of the second flange portion 13 is the first clamping plate portion 32 and the second clamping plate portion 33. So that a gap is formed between the holding cylinder portion 14 and the first clamping plate portion 32. Therefore, the length of the holding cylinder portion 14 needs to be less than the sum of the thicknesses of the base 45 and the permanent magnet 48.

  Further, after inserting the holding cylinder portion 14 of the coil bobbin 10 between the two clamping plate portions, the permanent magnet 48 and the base 45 are inserted in this order. If the holding cylinder part 14 comes out of the opening 34 when the base 45 is inserted, the distal end part of the holding cylinder part 14 comes into contact with the outer surface 12a of the first flange part 12, so that the permanent magnet 48 and the second clamping plate part The gap with 33 is insufficient to insert the base 45. What is simply inserted without being fixed like the holding cylinder part 14 may come off even if the operator touches it with a fingertip. This can be significant in small solenoids, causing a reduction in work efficiency. Therefore, in this embodiment, the sum of the length from the front end portion of the holding cylinder portion 14 of the coil bobbin 10 to the outer side surface 13a of the second flange portion 13 and the thickness of the permanent magnet 48 is the first clamping plate portion 32 and the second clamping plate portion 2. The gap is larger than the gap with the sandwiching plate portion 33. In this way, as shown in FIG. 7B, when the coil bobbin 10 and the permanent magnet 48 are positioned between the two sandwiching plate portions, the holding cylinder portion 14 is always in contact with the opening 34. And never get out.

  In summary, the length in the central axis direction of the core portion 11 of the holding cylinder portion 14 of the coil bobbin 10 is equal to or greater than the thickness of the permanent magnet 48 and the thickness of the base 45 and the permanent magnet 48. If it is less than the sum of the thicknesses, the core part 11 and the like of the coil bobbin 10 can be placed between the first sandwiching plate part 32 and the second sandwiching plate part 33 without hindrance and retained when the base 45 is inserted. There is an effect that the cylindrical portion 14 does not come out of the opening portion 34. Needless to say, the holding cylinder portion 14 not only does not come out of the opening 34 during assembly, but also has an effect of fixing the coil bobbin 10 to the yoke 30 after the solenoid 50 is assembled.

  8A and 8B are explanatory diagrams of the movable magnetic pole. FIG. 8A is a front view, FIG. 8B is a right side view, and FIG. 8C is a left side view. In FIG. 8, reference numeral 44 denotes a base end portion, and other reference numerals are the same as those in FIG. The movable magnetic pole 40 is disposed inside the core portion 11 in a state in which the movable magnetic pole 40 is slidable toward the distal end portion 42 side or the proximal end portion 44 side. When the movable magnetic pole 40 slides to the proximal end side, the proximal end portion 44 of the movable magnetic pole 40 is attracted to the base 45. In this embodiment, no means for preventing the movable magnetic pole 40 from being detached from the core portion 11 is provided. When an operator inserts the movable magnetic pole 40 into the core 11, the magnetic pole 40 is attracted to the base 45 by the magnetic flux of the permanent magnet 48, so that the assembly of the magnetic pole is completed only by this insertion work. In this embodiment, the tip portion 42 and the constricted portion 43 have the shape shown in FIG. 8 in order to facilitate connection to the movable portion of the load device. It can be appropriately changed according to the structure and the like. In addition, the base end portion 44 is formed with a taper that decreases in diameter toward the base end in order to adjust the suction force. About this part, it can change suitably according to the attraction | suction force or stroke which is requested | required.

  9A and 9B are explanatory diagrams of the base, the permanent magnet, and the ring. FIG. 9A is a right side view of the base, FIG. 9B is a front view of the base, FIG. 9C is a right side view of the permanent magnet, and FIG. The front view of a magnet, (E) is a right view of a ring, (F) is a front view of a ring. In FIG. 9, reference numerals 47a and 47b are notches, and other reference numerals are the same as those in FIG.

  The base 45 is one of fixed magnetic poles, and is formed in a substantially rectangular plate shape as a whole. Further, notches 47a and 47b are formed near the center of the left and right side portions. The notches 47a and 47b are formed at positions corresponding to the protrusions 17 and 18 of the coil bobbin 10 when the solenoid 50 is assembled. That is, when the solenoid 50 is assembled, the protrusions 17 and 18 enter the space formed by the notches 47a and 47b. The base 45 is locked to the coil bobbin 10. Depending on the positions where the protrusions 17 and 18 are formed, openings may be formed instead of the notches 47a and 47b. In this embodiment, the base 45 has a height at which the lower end is in contact with the substrate 31 in a state in which the solenoid 50 is assembled. is there.

The upper portion of the base 45 is a bent portion 46 that is bent in the horizontal direction. The distance between the bent portion 46 and the notches 47a and 47b is such that the base 45 is pushed between the second flange 13 and the permanent magnet 48, and the base 45 is projected into the space formed by the notches 47a and 47b. It is set so that the bent portion 46 comes into contact with the upper end surface of the permanent magnet 48 when 17 and 18 enter. Therefore, when the solenoid 50 is assembled, it is possible to prevent the protrusions 17 and 18 from entering the space formed by the notches 47a and 47b and then detaching from the space by pushing the base 45 too much. In addition, since the bent portion 46 and the upper end surface of the permanent magnet 48 are in contact with each other when the solenoid 10 is assembled, there is an advantage that magnetic flux leaking from the upper end surface of the permanent magnet 48 to the external space can be taken into the magnetic circuit. .
Further, when the base 45 is pushed between the second flange 13 and the permanent magnet 48 at the time of assembly, if there is a bent portion 46, there is an effect that the finger 45 can be pushed easily. In addition, when the coil bobbin 10 is disassembled, there is also an effect that the base 45 can be extracted simply by inserting the tip of the tool between the bent portion 46 and the permanent magnet 48 and raising the tool upward. If the dimensional accuracy of the base 45 and the like can be sufficiently secured, the bent portion 46 can be omitted.

  The permanent magnet 48 is located between the base 45 and the second clamping plate portion 33 in a state where the solenoid 50 is assembled. Further, as described above, the movable magnetic pole 40 can be self-held by attracting the movable magnetic pole 40 through the base 45. Further, a magnetic circuit that flows through the yoke 30, the base 45, and the movable magnetic pole 40 is generated, and an attractive force is exerted on the movable magnetic pole 40 via the base 45. Further, a small magnetic circuit is generated around the permanent magnet 48, the yoke 30 and the base 45, and an attractive force is exerted between them. The washer 49 serves as a buffer to the movable part of the load device.

  Next, the operation of the solenoid according to this embodiment will be described. 10A and 10B are explanatory diagrams of the operating state of the solenoid, where FIG. 10A shows a state when the movable magnetic pole is attracted, FIG. 10B shows a non-energized state, and FIG. 10C shows a state when the movable magnetic pole is repelled. The reference numerals used in FIG. 10 are the same as those in FIG.

  When the coil 24 is energized so that the magnetic flux flows in the direction shown in FIG. 10A, the movable magnetic pole 40 is instantaneously attracted to the base 45 in combination with the magnetic flux generated by the permanent magnet 48. The When the movable magnetic pole 40 is attracted to the base 45, the movable magnetic pole 40 is maintained in a state of being strongly attracted to the base 45 as long as energization is continued in this direction.

  When the coil 24 is not energized, the state in which the movable magnetic pole 40 is attracted to the base 45 is maintained as it is by the magnetic flux generated by the permanent magnet 48 as shown in FIG.

  When the coil 24 is energized so that the magnetic flux flows in the direction shown in FIG. 10C, a magnetic flux in the direction opposite to that in FIG. 10A is generated by this energization, and the current flowing through the coil 24 is predetermined. When the value is reached, the magnetic flux and the magnetic flux generated by the permanent magnet 48 cancel each other, and are separated from the base 45 by the force from the load device connected to the movable magnetic pole 40. When the energization of the coil is stopped in the state shown in FIG. 10C, the movable magnetic pole 40 is attracted to the base 45 by the magnetic flux generated by the permanent magnet 48. Depending on the magnitude of the force applied from the load device, the movable magnetic pole 40 may remain stopped at that position.

  Next, the procedure for assembling the solenoid according to this embodiment will be described. FIG. 11 is an explanatory diagram (1) of the procedure for assembling the solenoid. (A) and (B) are the procedure for attaching the coil bobbin, and (C) are the procedure for attaching the permanent magnet. FIG. 12 is an explanatory view (2) of the procedure for assembling the solenoid. (D) and (E) are the mounting procedure of the base, and (F) is the mounting procedure of the movable magnetic pole. The reference numerals used in FIGS. 11 and 12 are the same as those in FIGS. 1 and 3. In the following description, an assembly procedure after the coil wire is wound around the coil bobbin 10 to provide the coil 24 will be described.

  First, as shown in FIG. 11 (A), the core portion 11, the first flange portion 12, the second flange portion 13 and the holding portion of the coil bobbin 10 are provided between the first holding plate portion 32 and the second holding plate portion 33. The cylinder part 14 is inserted. As described above, the length from the distal end portion of the holding cylinder portion 14 to the outer side surface 13a of the second collar portion 13 is shorter than the gap between the first clamping plate portion 32 and the second clamping plate portion 33. Can be inserted smoothly. Next, as shown in FIG. 11B, the holding cylinder portion 14 is inserted into the opening 34 of the first clamping plate portion 32. Since the diameter of the opening 34 is set slightly larger than the outer diameter of the holding cylinder part 14 of the coil bobbin 10, the holding cylinder part 14 can be inserted manually.

  Further, as shown in FIG. 11C, a permanent magnet 48 is inserted between the second flange 13 and the second clamping plate 33. Subsequently, as shown in FIG. 12D, the base 45 is pushed between the second flange 13 and the permanent magnet 48. Although it becomes difficult to push in after the lower end portion of the base 45 hits the projections 17 and 18, if the projection is continued as it is, the projections 17 and 18 enter the space formed by the cutouts 47a and 47b, as shown in FIG. It becomes a state.

  Next, as shown in FIG. 12 (F), the movable magnetic pole 40 is inserted into the hollow portion 21 of the core portion 11 exposed in the opening portion 34 from the opening portion 21a side. The movable magnetic pole 40 is attracted to the base 45 during the insertion due to the influence of the magnetic flux of the permanent magnet 48. Finally, when the washer 49 is inserted from the tip 42 of the movable magnetic pole 40, the completed state shown in FIGS.

  Note that the shapes of the coil bobbin and the yoke are not limited to those of the above-described embodiments, and various modifications can be added. FIG. 13 is an explanatory diagram (1) of a modification of the solenoid according to the embodiment of the present invention, in which (A) is a plan view and (B) is a right side view. In FIG. 13, 27 is a groove, 28 and 29 are rod-like terminals, 39 is a fixing portion, and other reference numerals are the same as those in FIG.

  In the coil bobbin shown in FIG. 13, the groove 27 of the first holding plate portion 15 is bent in an L shape, and the rod-shaped terminals 28 and 29 are arranged on the side of the first holding plate portion 15, that is, on the core portion 11. It is formed to extend in a direction orthogonal to the central axis. As for the yoke, a fixing portion 39 is formed on the side of the substrate portion 31 where the second holding plate portion 16 is provided, and openings 37 and 38 are formed with respect to the fixing portion 39. This modification is advantageous when the electrical connection to the external device is performed in the direction orthogonal to the central axis of the core part 11. The yoke 50 has a useful structure when only the fixing portion 39 is used for screwing the solenoid 50, so that the fixing portion cannot be provided on both sides of the substrate portion 31 in relation to the external device.

  Further, the base or permanent magnet is not limited to the above-described embodiment, and various modifications can be made. FIG. 14 is an explanatory view (2) of a modification of the solenoid according to the embodiment of the present invention, in which (A) is a plan view, (B) is a right side view, (C) is a right side view of the base, (D) is a right side view of the permanent magnet. In FIG. 14, reference numeral 51 denotes a protruding portion, and other reference numerals are the same as those in FIG.

  The base 45 shown in FIG. 14C is provided with a bent portion 46 partially, and the bent portion 46 is provided at a portion located near the first holding plate portion 15 when the solenoid 50 is assembled. Not provided. In addition, the permanent magnet 48 shown in FIG. 14D is provided with a protruding portion 51 that extends upward at a portion located near the first holding plate portion 15 when the solenoid 50 is assembled. The width of the base 45 where the bent portion 46 is not provided is set to be slightly wider than the width of the protruding portion 51. In the solenoid 50 in which the base 45 and the permanent magnet 48 are formed as described above, as shown in FIGS. 14A and 14B, the protruding portion 51 protrudes above the base 45 and the second holding plate portion 33. It will be a thing. In this modification, the configuration as described above prevents the permanent magnet 48 from being erroneously attached with the reverse polarity. That is, which of the N-pole side and the S-pole side of the permanent magnet 48 is directed to the base 45 side is determined by the winding direction of the coil 24 and the direction of current flow. It must be directed to the 45 side. In this modification, when the permanent magnet 48 is inserted in the opposite direction between the two sandwiching plate portions, the protruding portion 51 contacts the bent portion 46 when the base 45 is inserted, and the base 45 is completely inserted. Can not be. Therefore, there is an advantage that the permanent magnet 48 can be assembled in a state where it is oriented in the correct direction, and the working efficiency can be improved.

  As described above, in the solenoid 50 according to this embodiment, the holding cylinder portion 14 is inserted into the opening 34 of the first holding plate portion 32, and the second holding plate portion 33 is connected to the first holding plate portion 15. While being positioned between the second holding plate portion 16 and the first holding plate portion 32 and the second holding plate portion 33, the core portion 11, the first flange portion 12 and the second flange portion 13 of the coil bobbin 10. Can be easily assembled by inserting the permanent magnet 48 and the base 45 between the second flange 13 and the second clamping plate 33. In addition, the above assembly can be performed only by hand. Further, even if an impact is applied from the outside in a state where the dimensional accuracy of the solenoid 50 is not high, the protrusions 17 and 18 of the coil bobbin 10 are accommodated in the spaces of the notches 47a and 47b of the base 45. 17 and 18 lock the base 45 to prevent the base 45 from being detached. The permanent magnet 48 is assembled in contact with the base 45 and the second sandwiching plate portion 33, and the base 45 and the second sandwiching plate portion 33 are further formed by a magnetic circuit that goes around the permanent magnet 48, the yoke 30, and the base 45. Since the attractive force is acting between the permanent magnet 48 and the permanent magnet 48, the permanent magnet 48 will not be detached. At the same time, the base 45 is prevented from being separated by this adsorption force. Further, since the holding cylinder portion 14 of the coil bobbin 10 is inserted into the opening 34 of the first clamping plate portion 32, the opening 34 locks the holding cylinder portion 14 so that the coil bobbin 10 on the side of the first flange 12. Also prevents withdrawal. In addition, since the projections 17 and 18 are engaged with the notches 47a and 47b of the base 45, the second bobbin 13 side of the coil bobbin 10 is prevented from being detached. In short, the clamping force of the yoke 30, the magnetic force of the permanent magnet 48, and the locking structure of the protrusions 17 and 18 and the holding cylinder part 14 have the effect of reliably maintaining the assembled state of the solenoid 50.

  When the bent portion 46 is formed in the base 45, when assembling the solenoid 50, after the protrusions 17 and 18 enter the space formed by the notches 47a and 47b, the base 45 is continuously pushed in more than necessary. The protrusions 17 and 18 can be prevented from leaving the space. Further, when the assembled solenoid 50 is once disassembled and reassembled for some reason, such as when the permanent magnet 48 is assembled in the direction of reverse polarity, a tool is inserted between the bent portion 46 and the permanent magnet 48, Further, the base 45 can be easily extracted by pulling up the tool. Further, the length of the holding cylinder portion 14 in the central axis direction of the core portion 11 is equal to or greater than the thickness of the permanent magnet 48 and less than the sum of the thickness of the base 45 and the thickness of the permanent magnet 48. When the permanent magnet 48 is inserted between the flange 13 and the second clamping plate portion 33, the coil bobbin 10 is pressed against the permanent magnet 48, that is, the holding cylinder portion 14 is detached from the opening 34 of the first clamping plate portion 32. Since the insertion state of the holding cylinder portion 14 is maintained even if it is moved, the coil bobbin 10 is not detached from the yoke 30 once the permanent magnet 48 is inserted, and the assembling work is facilitated.

  Further, the protrusions 17 and 18 provided so as to straddle the second flange 13, the first holding plate 15 and the second holding plate 16 are reinforced against stress such that the tip portions of the two holding plates are separated from each other. Therefore, when the base 45 and the permanent magnet 48 are inserted, or after the insertion, the deformation of the two holding plate portions can be reduced, and the assembled state of the solenoid 50 can be more reliably maintained. In addition, when the solenoid 50 is incorporated into another device, the rod-like terminals 25 and 26 connected to the end of the coil 24 and the connectors connected to the rod-like terminals 25 and 26 are the base 45, the permanent magnet 48 and the second magnet. It is located in the immediate vicinity of the back side of the clamping plate portion 33. That is, when the second flange 13 and the like are viewed from the rod-shaped terminals 25 and 26 and the back of the connector, the second flange 13 and the like are hidden behind a barrier called a connector. Accordingly, in the middle of the work of incorporating the solenoid 50 into another device, the tool is not inadvertently hit against the second flange 13 or the like from the rear side of the connector to be deformed or damaged. As a result, there is an effect that the deformation or breakage of the solenoid 50 can be reduced and the assembled state can be more reliably maintained.

  Since the lead wires 24a and 24b of the coil wire constituting the coil 24 protrude from the surface of the first holding plate portion 15 and the second holding plate portion 16 facing away from the second flange portion 13, the end of the coil winding There is an effect that the fixing work in the vicinity of the portion becomes easy. Further, since the portion near the end of the coil wire can be wired in either the groove 19a or 19b of the first holding plate portion 15 and the groove 20a or 20b of the second holding plate portion 16, it is possible to distinguish the vertical direction of the coil bobbin. It is not necessary and assembly work becomes easy. Further, the first holding plate portion 15 and the second holding plate portion 16 are provided with a through hole 22 and a through hole 23, and the rod-like terminal 25 and the rod-like terminal 26 are fitted into these through-holes, and these Since the portion near the end of the coil wire is wound around the rod-shaped terminal, the fixing work near the end of the coil wire is facilitated.

  The present invention is not limited to the contents described above. For example, the shape of the details of the holding plate portion or holding cylinder portion of the coil bobbin, the shape of the rod-shaped terminal, the position where the rod-shaped terminal is provided, the base or the permanent magnet Various modifications can be made to the outer shape, the diameter of the coil, the type of the coil wire, and the like without departing from the scope described in each claim.

DESCRIPTION OF SYMBOLS 10 Coil bobbin 11 Core part 12 1st collar part 12a Outer side surface 13 2nd collar part 13a Outer side surface 14 Holding cylinder part 15 1st holding plate part 16 2nd holding plate part 17 Projection part 18 Projection part 19a Groove 19b Groove 20a Groove 20b groove 21 hollow portion 21a opening portion 21b opening portion 22 through hole 23 through hole 24 coil 24a lead wire 24b lead wire 25 rod-like terminal 26 rod-like terminal 27 groove 28 rod-like terminal 29 rod-like terminal 30 yoke 31 substrate portion 32 first clamping plate portion 33 Second sandwiching plate portion 34 Opening portion 35 Fixing portion 36 Fixing portion 37 Opening portion 38 Opening portion 39 Fixing portion 40 Movable magnetic pole 41 Main body portion 42 Front end portion 43 Constriction portion 44 Base end portion 45 Base 46 Bending portion 47a Notch portion 47b Notch 48 Permanent magnet 49 Washer 50 Solenoid 51 Protrusion 90 Solenoid 91 Yoke 92 Coil bobbin 93 Coil 94 Movable Pole 95 fixed magnetic pole 96a engaged portion 96b engaged portion 97 engaging portion projecting portions 98 attaching member 98a locking claw 98b locking claws 99 guide groove 99a engaging portion 99b engaging portion

Claims (8)

The core part formed in a substantially cylindrical shape, the substantially plate-like first and second collar parts respectively provided at both ends of the core part, and the second collar part are opposed to each other. A coil bobbin comprising a substantially plate-like first holding plate portion and a second holding plate portion provided so as to extend in parallel with the central axis of the core portion from two edges or in the vicinity thereof;
A movable magnetic pole that is inserted into the core portion and is slidable along the central axis of the core portion;
A base disposed between the first holding plate portion and the second holding plate portion and at a position where the movable magnetic pole can be contacted;
A permanent magnet disposed between the first holding plate portion and the second holding plate portion and in contact with the base;
A solenoid comprising a yoke provided so as to sandwich the coil bobbin, the base and the permanent magnet, and a coil wound around the core portion. The coil bobbin further includes at least one protrusion that protrudes from a surface on the side where the opening of the core part of the second flange part is exposed,
The base is disposed such that the first surface is in contact with the surface of the second flange portion on the side where the opening of the core portion is exposed, and a notch or opening is formed at a portion corresponding to the protrusion. 2. The solenoid according to claim 1, wherein a portion is formed, and the protrusion is configured to be accommodated in the notch or the opening. The coil bobbin further includes a substantially cylindrical holding cylinder portion provided so as to extend in parallel with the central axis of the core portion from the periphery of the opening portion of the core portion exposed to the first flange portion,
The permanent magnet is disposed such that a first surface is in contact with a second surface facing away from the first surface of the base;
The yoke is provided so as to be in contact with a substrate portion formed in a substantially plate shape and a surface of the core portion of the first flange portion where the opening is exposed at an edge of the substrate portion. An opening is provided in the vicinity thereof, and the first holding plate portion having a substantially plate shape in which the holding cylinder portion is inserted into the opening portion, and the first holding plate holding portion on the other edge of the substrate portion. And an abbreviated arrangement arranged between the first holding plate portion and the second holding plate portion and in contact with the second surface facing away from the first surface of the permanent magnet. A plate-like second clamping plate portion is provided, wherein the first clamping plate portion and the second clamping plate portion sandwich the coil bobbin, the base and the permanent magnet. Item 3. The solenoid according to Item 2.   The coil bobbin has a length in the central axis direction of the core portion of the holding cylinder portion that is equal to or greater than a thickness of the permanent magnet and less than a sum of the thickness of the base and the thickness of the permanent magnet. The solenoid according to claim 3.   The two coil bobbins are provided so that the projections straddle the second flange, the first holding plate, and the second holding plate, respectively. The solenoid according to claim 4.   In the coil bobbin, an end portion of the coil winding protrudes from a surface in which at least one of the first holding plate portion and the second holding plate portion faces away from the second flange portion. A groove or a through hole is provided so as to extend in parallel with the central axis of the winding core portion, and a portion near the end of the winding of the coil is wired inside the groove or the through hole. The solenoid according to any one of claims 1 to 5.   The coil bobbin is provided with the grooves on the upper end side and the lower end side of the first holding plate portion and the second holding plate portion, respectively, and the groove on the upper end side of the first holding plate portion and the first Between the groove on the lower end side of the first holding plate portion and between the groove on the upper end side of the second holding plate portion and the groove on the lower end side of the second holding plate portion, respectively. Through holes are provided, and conductive rods that are fitted into these through holes and project from the back-facing surface to the second flange portion are provided, respectively, in the vicinity of the ends of the windings of the coils. The solenoid according to claim 6, wherein a portion is wound around the rod body.   The solenoid according to any one of claims 2 to 7, wherein the base further includes a bent portion formed so as to extend from the upper end portion along the upper end surface of the permanent magnet. .

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