Solenoid device and solenoid core fixing method

Abstract

This technology provides an effective way to increase the fixing strength between the bobbin and core of a solenoid device. [Solution] The solenoid device 1 comprises a bobbin 10 around which a coil C is wound, and a core 20 having a fixing portion 22 that is inserted into and fixed in the insertion space 12 of the bobbin 10. The bobbin 10 has a hooking portion 13 provided at the opening edge of the insertion space 12, and the fixing portion 22 of the core 20 has a pressing portion 24 that is pressed against the inner wall surface 11b that defines the insertion space 12 of the bobbin 10, and a hooking portion 25 that hooks onto the hooking portion 13 of the bobbin 10 in the insertion direction X1.

Description

Technical Field

[0001] The present invention relates to a solenoid device and a method for fixing a solenoid core.

Background Art

[0002] The following Patent Document 1 discloses a conventional electromagnetic pump. The solenoid device constituting this electromagnetic pump includes a bobbin and a core made of a magnetic metal. The bobbin and the core are fixed and integrated with a fixing portion, which is a part of the core, inserted into the insertion space of the bobbin.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When manufacturing a solenoid device of this type of electromagnetic pump, for example, the bobbin and the core are fixed to each other by performing plastic processing such as pressing the fixing portion of the core against the inner wall surface of the bobbin in a state where the fixing portion of the core is inserted into the insertion space of the bobbin. In this case, it is required to ensure sufficient fixing strength between the bobbin and the core that can withstand the load during the operation of the electromagnetic pump. The same requirement also exists for devices other than electromagnetic pumps.

[0005] The present invention has been made in view of such problems, and aims to provide a technique effective for increasing the fixing strength between the bobbin and the core of a solenoid device.

Means for Solving the Problems

[0006] One aspect of the present invention is a solenoid device including a bobbin around which a coil is wound and a core having a fixing portion inserted and fixed in the insertion space of the bobbin, The bobbin has a hook portion provided at the opening edge of the insertion space, The fixing portion of the core has a pressing portion that is pressed against the inner wall surface that defines the insertion space of the bobbin, and a hooking portion that hooks onto the hooked portion of the bobbin in the insertion direction, solenoid device, It is located there.

[0007] Another aspect of the present invention is: A solenoid core fixing method for fixing a core to a bobbin around which a coil is wound, A hooking portion is provided at the opening edge of the bobbin insertion space, A projection is provided on the insertion tip side of the core fixing portion that protrudes from the insertion space of the bobbin. Insert the fixing portion of the core into the insertion space of the bobbin, A solenoid core fixing method, wherein the aforementioned projection is deformed outward with a processing tool toward the hooked portion of the bobbin, thereby forming a pressing portion that presses the fixing portion against the inner wall surface that defines the insertion space of the bobbin, and a hooking portion that hooks onto the hooked portion in the insertion direction. It is located there. [Effects of the Invention]

[0008] In the solenoid device according to the above embodiment, the fixed portion of the core inserted into the bobbin insertion space is pressed against the inner wall surface of the bobbin at the pressing portion and hooks onto the hooked portion of the bobbin in the insertion direction at the hooking portion. Furthermore, in the solenoid core fixing method according to the above embodiment, a pressing portion and a hooking portion can be formed on the fixed portion by deforming a projection previously provided on the insertion tip side of the fixed portion of the core outward toward the hooked portion of the bobbin using a processing tool.

[0009] Here, the pressing portion widens the core's fixing portion outward toward the inner wall surface of the bobbin, applying a pressing load to the bobbin. On the other hand, the hooking portion hooks onto the hooked portion of the bobbin in the insertion direction, restricting the movement of the fixing portion from coming out of the bobbin's insertion space. The core's fixing portion combines the functions of both the pressing portion and the hooking portion, thereby preventing movement toward the bobbin in the insertion direction. This allows the bobbin and core to be firmly fixed together.

[0010] As described above, each of the above embodiments provides a technique that is effective in increasing the fixing strength between the bobbin and the core of the solenoid device. [Brief explanation of the drawing]

[0011] [Figure 1] A perspective view of the solenoid device of Embodiment 1, seen from diagonally above. [Figure 2] A side view of the solenoid device shown in Figure 1, viewed from the side. [Figure 3] This is a perspective view showing the insertion step of inserting the core fixing portion into the insertion space of the bobbin, as part of the solenoid core fixing method of Embodiment 1. [Figure 4] This is a cross-sectional view showing the state after the core fixing part has been inserted into the bobbin insertion space by the insertion step in Figure 3, and before the plastic deformation step using a punch. [Figure 5] Figure 4 is a plan view of the bobbin and core as seen from the punch side. [Figure 6] Figure 4 is a cross-sectional view showing the state during the plastic deformation step using a punch. [Figure 7] A cross-sectional view showing the core fixed to the bobbin by the plastic deformation step in Figure 6. [Figure 8] A plan view of the bobbin and core shown in Figure 7, viewed from above. [Figure 9] A perspective view of the solenoid device of Embodiment 2, seen from diagonally above. [Figure 10] A plan view corresponding to Figure 5 of the solenoid core fixing method of Embodiment 2. [Figure 11]A plan view corresponding to FIG. 8 regarding the solenoid core fixing method of Embodiment 2.

Mode for Carrying Out the Invention

[0012] Preferred embodiments of each of the above aspects will be described below.

[0013] In the solenoid device of the above aspect, the engaging portion is formed by plastically deforming a protrusion provided on the insertion tip side of the fixing portion so as to protrude from the insertion space of the bobbin toward the engaged portion of the bobbin, and the pressing portion is preferably formed along with the plastic deformation of the protrusion.

[0014] In this solenoid device, the engaging portion of the core is formed by plastically deforming a protrusion provided in advance on the insertion tip side of the fixing portion. Therefore, by setting the dimensions of the protrusion so as to increase the protruding amount and area, the ratio of the size of the engaging portion of the core that is hooked on the engaged portion of the bobbin can be increased, and thereby, the function of restricting the movement of the fixing portion of the core from coming out of the insertion space of the bobbin can be strengthened.

[0015] In the solenoid device of the above aspect, the fixing portion has a laminated structure in which a plurality of plate-like portions are laminated in the lamination direction, and when the direction orthogonal to both the lamination direction and the insertion direction is taken as the plate width direction of each of the plurality of plate-like portions, it is preferable that the engaging portions are provided on both sides in the plate width direction of all of the plurality of plate-like portions.

[0016] According to this solenoid device, when the fixing portion of the core has a laminated structure formed by a plurality of plate-like portions, engaging portions are provided on both sides in the plate width direction of all of the plurality of plate-like portions, and the engaging portions can be hooked on the engaged portion of the bobbin.

[0017] In the solenoid device according to the above-described embodiment, the fixing portion has a laminated structure in which a plurality of plate-like portions are stacked in the stacking direction, and when the direction perpendicular to both the stacking direction and the insertion direction is defined as the plate width direction of each of the plurality of plate-like portions, it is preferable that the fixing portion has the hooking portions on both sides of the plate width direction of only the plate-like portions at both ends of the stacking direction among the plurality of plate-like portions.

[0018] According to this solenoid device, when the core's fixing part is a laminated structure of multiple plate-like parts, hooks can be provided on both sides in the width direction of only the plate-like parts at both ends in the lamination direction, and these hooks can be hooked onto the hooked part of the bobbin. Furthermore, by adopting a structure in which the other plate-like parts are sandwiched from both sides in the lamination direction by two plate-like parts having hooks on both sides in the width direction, the number of plate-like parts on which hooks are provided can be reduced.

[0019] In the solenoid core fixing method according to the above embodiment, the fixing portion has a laminated structure in which a plurality of plate-like portions are stacked in the stacking direction, the projections are provided on both sides of the plate width direction of all of the plurality of plate-like portions, and when the direction perpendicular to both the stacking direction and the insertion direction is the plate width direction of each of the plurality of plate-like portions, it is preferable to form the hooking portions on both sides of the plate width direction of all of the plurality of plate-like portions by processing the projections.

[0020] According to this solenoid core fixing method, when the core fixing part is a laminated structure of multiple plate-like parts, protrusions can be provided on all of the multiple plate-like parts constituting the core fixing part, and these protrusions can be processed with a processing tool to form hooking parts that hook onto the hooked part of the bobbin on all of the multiple plate-like parts.

[0021] In the solenoid core fixing method according to the above embodiment, the fixing portion has a laminated structure in which a plurality of plate-like portions are laminated in the lamination direction, and the projections are provided on both sides in the width direction of only the plate-like portions at both ends of the lamination direction among the plurality of plate-like portions, and when the direction perpendicular to both the lamination direction and the insertion direction is defined as the width direction of each of the plurality of plate-like portions, it is preferable to form the hooking portions on both sides in the width direction of only the plate-like portions at both ends of the lamination direction among the plurality of plate-like portions by processing the projections.

[0022] According to this solenoid core fixing method, when the core fixing part has a laminated structure of multiple plate-like parts, by providing protrusions on only some of the plate-like parts that make up the core fixing part and processing these protrusions with a processing tool, it is possible to form hooking parts that catch on the hooking part of the bobbin only on those plate-like parts. This makes it possible to reduce the number of plate-like parts on which protrusions are provided in advance.

[0023] Hereinafter, specific examples of the solenoid device and solenoid core fixing method of this embodiment will be described with reference to the drawings. In the drawings, unless otherwise specified, the first direction is indicated by arrow X, the second direction perpendicular to the first direction is indicated by arrow Y, and the direction perpendicular to both the first and second directions is indicated by arrow Z.

[0024] (Embodiment 1) 1. Overall configuration of solenoid device 1 The solenoid device 1 of Embodiment 1 shown in Figure 1 is a device for converting electrical energy into various mechanical motions using electromagnetic force. The solenoid device 1 is suitably used as an electromagnet in an electromagnetic pump. This solenoid device 1 comprises a bobbin 10 and a core 20 as its main components. In this solenoid device 1, the core 20 is fixed to and integrated with the bobbin 10. The bobbin 10 is made of an electrically insulating resin material. In contrast, the core 20 is made by stacking multiple electromagnetic steel sheets 21 of the same shape in the second direction Y, which is the stacking direction.

[0025] 1-1. Structure of Bobbin 10 As shown in Figures 1 and 2, the bobbin 10 has a cylindrical portion 11 (see Figure 2) and two flange portions 14 provided on both sides of the cylindrical portion 11 in a first direction X. In this embodiment, the cylindrical portion 11 is formed in a rectangular tube shape. The bobbin 10 has an insertion space 12 formed by a through hole that penetrates the inside of the cylindrical portion 11 in the first direction X. A coil C, which is a winding, is wound around the outer circumferential surface 11a of the cylindrical portion 11 (see Figure 2). At this time, the space partitioned by the outer circumferential surface 11a of the cylindrical portion 11 and the two flange portions 14 becomes the arrangement space for the wound coil C. A hook portion 13 is provided at one of the opening edges of the insertion space 12 of the cylindrical portion 11 in the first direction X. Each flange portion 14 is provided with a terminal 15 for connecting the end of the coil C to an external power source. Although not specifically shown in the figures, the coil C wound around the outer circumferential surface 11a of the cylindrical portion 11 is covered with an appropriate insulating material such as electrical insulating tape. For convenience, in this specification, the side on which the terminal 15 is provided will be described as the upper side of the solenoid device 1.

[0026] 1-2. Core 20 Structure As shown in Figures 1 and 2, the core 20 is configured to have a "roughly C-shape" or "roughly U-shape" when viewed from the second direction Y. That is, the core 20 has a first core portion 22 and a second core portion 26 that extend parallel to each other in the first direction X, and a third core portion 27 that extends in the third direction Z between the first core portion 22 and the second core portion 26. All three of these core portions 22, 26, and 27 have a laminated structure in which multiple plate-like portions 22a, 26a, and 27a (see Figure 3) are stacked in the second direction Y.

[0027] The first core portion 22 of the core 20 is a fixing portion that is inserted into and fixed in the insertion space 12 of the bobbin 10. This first core portion 22 has a pressing portion 24 and a hooking portion 25. In this first core portion 22, the thickness direction of each plate-like portion 22a corresponds to the second direction Y, and the width direction of each plate-like portion 22a corresponds to the third direction Z.

[0028] The pressing portion 24 is the part of the first core portion 22 that is pressed against the inner wall surfaces 11b on both sides of the cylindrical portion 11 of the bobbin 10 in the third direction Z. The inner wall surfaces 11b are the wall surfaces that define the insertion space 12. The pressing portion 24 functions to widen the first core portion 22 outward in the third direction Z toward the inner wall surfaces 11b of the bobbin 10, thereby applying an outward pressing load in the third direction Z to the cylindrical portion 11 of the bobbin 10.

[0029] The hook portion 25 hooks onto the hooked portion 13 of the cylindrical portion 11 of the bobbin 10 in the insertion direction X1, thereby restricting the movement of the first core portion 22 out of the insertion space 12 of the bobbin 10. In this embodiment, the first core portion 22 is configured to have hook portions 25 on both sides of all of the multiple plate-shaped portions 22a in the third direction Z.

[0030] In this embodiment, the first core portion 22 of the core 20 is configured to enhance the function of preventing movement in the insertion direction X1 relative to the bobbin 10 by combining the functions of the pressing portion 24 and the hooking portion 25.

[0031] 2. Method for fixing the solenoid core in solenoid device 1 The solenoid core fixing method of Embodiment 1 will be described with reference to Figures 3 to 8. This solenoid core fixing method involves inserting the first core portion 22 of the core 20 into the insertion space 12 of the cylindrical portion 11 of the bobbin 10 and fixing it in place.

[0032] As shown in Figure 3, in this embodiment, first, the bobbin 10 and core 20 are prepared. At this time, the bobbin 10 has a hook portion 13 provided on the opening edge of the insertion space 12. In this embodiment, the hook portion 13 is a chamfered portion that is inclined with respect to both the first direction X and the third direction Z. The core 20 has a projection 23 that protrudes from the insertion space 12 of the bobbin 10 on the insertion tip side of the first core portion 22. The "insertion tip" here corresponds to the part of the first core portion 22 that is first inserted into the insertion space 12 of the bobbin 10. In the core 20 of this embodiment, projections 23 are provided on both sides of the third direction Z of all of the multiple plate-like portions 22a of the first core portion 22.

[0033] With the bobbin 10 and core 20 configured as described above, an insertion step is performed to insert the first core portion 22 of the core 20 into the insertion space 12 of the bobbin 10, as shown in Figure 3. In Figure 3, the insertion direction of the first core portion 22 at this time is indicated by the arrow X2. As shown in Figure 4, after the insertion step, only the projections 23 of the multiple plate-like portions 22a of the first core portion 22 protrude upward from the insertion space 12 of the bobbin 10.

[0034] The shape of the projection 23 is not limited to that shown in Figure 4, and any suitable shape can be adopted. For example, by setting the dimensions of the projection 23 to increase its protrusion amount and area, it becomes possible to increase the proportion of the hook portion 25 formed by the plastic deformation of the projection 23 that catches on the hooked portion 13 of the bobbin 10.

[0035] After the insertion step described above, a plastic deformation step is performed. This plastic deformation step uses crimping with a punch 30. The punch 30 is a workpiece equipped with a cutting edge 31 having a processing surface 31a of a desired shape. The punch 30 is lowered from a first position P1 (see Figure 4) to a second position P2 (see Figure 6) toward the crimping region A (see Figure 5). As shown in Figure 5, the crimping region A is the region corresponding to the stacked portion of the multiple protrusions 23, and corresponds to the region extending in the second direction Y from both sides of the third direction Z of the first core portion 22. In this embodiment, there are two crimping regions A.

[0036] As shown in Figure 6, in the plastic deformation step described above, each projection 23 of the first core portion 22 is plastically deformed outward toward the hooked portions 13 on both sides of the bobbin 10 in the third direction Z, according to the shape of the machined surface 31a of the punch cutting edge 31. As a result of this plastic deformation step, hooked portions 25 are formed on both sides of the third direction Z of all of the multiple plate-like portions 22a of the first core portion 22 (see Figures 6 to 8).

[0037] The hook portion 25 is formed by plastically deforming the projection 23 of the first core portion 22, and the pressing portion 24 is formed in conjunction with the plastic deformation of the projection 23 of the first core portion 22. As a result, the hook portion 25 hooks onto the hooked portion 13 of the bobbin 10. At the same time, a pressing load F (see Figure 6) is generated on the pressing portion 24 toward the inner wall surface 11b of the bobbin 10. As a result, the first core portion 22 is pressed against the inner wall surface 11b of the bobbin 10 by the pressing portion 24.

[0038] 3. Effects In the solenoid device 1 of Embodiment 1, the first core portion 22 of the core 20, which is inserted into the insertion space 12 of the bobbin 10, is pressed against the inner wall surface 11b of the bobbin 10 at the pressing portion 24, and is hooked in the insertion direction X1 to the hooked portion 13 of the bobbin 10 at the hooking portion 25. Furthermore, in the solenoid core fixing method of Embodiment 1, the pressing portion 24 and the hooking portion 25 can be formed on the first core portion 22 by plastically deforming the projection 23, which is provided in advance on the insertion tip side of the first core portion 22 of the core 20, outward toward the hooked portion 13 of the bobbin 10 using a punch 30.

[0039] Here, the pressing portion 24 functions to apply a pressing load F to the bobbin 10 by widening the first core portion 22 of the core 20 outward toward the inner wall surface 11b of the bobbin 10. On the other hand, the hooking portion 25 functions to restrict the movement of the first core portion 22 out of the insertion space 12 of the bobbin 10 by hooking onto the hooked portion 13 of the bobbin 10 in the insertion direction X1. The first core portion 22 of the core 20 combines the functions of the pressing portion 24 and the hooking portion 25, thereby preventing movement in the insertion direction X1 toward the bobbin 10. This allows the bobbin 10 and the core 20 to be firmly fixed together.

[0040] When the solenoid device 1 is used in an electromagnetic pump, it is necessary to prevent the first core portion 22 of the core 20 from moving in the insertion direction X1 relative to the bobbin 10 and falling off, even when subjected to high loads such as vibrations during operation. In this embodiment, the bobbin 10 and the core 20 can be firmly fixed by crimping with the punch 30 alone, so there is no need to, for example, apply adhesive to join the bobbin 10 and the core 20. In this case, the adhesive application process is unnecessary, which has the advantage of reducing the number of work steps.

[0041] Therefore, according to Embodiment 1, the fixing strength between the bobbin 10 and the core 20 of the solenoid device 1 can be increased.

[0042] In the solenoid device 1, the hook portion 25 of the core 20 is formed by plastically deforming a projection 23 that is pre-provided on the insertion tip side of the first core portion 22. Therefore, by setting the dimensions of the projection 23 to increase the amount of protrusion and area, the proportion of the hook portion 25 of the core 20 that catches on the hooked portion 13 of the bobbin 10 can be increased, thereby strengthening the function of restricting the movement of the first core portion 22 of the core 20 from coming out of the insertion space 12 of the bobbin 10.

[0043] According to the solenoid device 1, by providing protrusions 23 on all of the multiple plate-shaped portions 22a that constitute the first core portion 22 of the core 20 and plastically deforming the protrusions 23 with a punch 30, hooking portions 25 that hook onto the hooking portion 13 of the bobbin 10 can be formed on all of the multiple plate-shaped portions 22a.

[0044] Hereinafter, other embodiments related to Embodiment 1 described above will be explained with reference to the drawings. In the other embodiments, the same reference numerals are used as in Embodiment 1 described above, and the explanation of such identical elements will be omitted.

[0045] (Embodiment 2) 4. Overall configuration of solenoid device 2 The solenoid device 2 of Embodiment 2 shown in Figure 9 is a device that uses electromagnetic force to convert electrical energy into various mechanical motions, similar to the solenoid device 1 of Embodiment 1. This solenoid device 2 comprises a bobbin 10 and a core 20A as its main components.

[0046] 4-1. Structure of Core 20A As shown in Figure 9, the first core portion 22 of the core 20A is configured such that only the plate-shaped portions 22a at both ends in the second direction Y have hooking portions 25 on both sides in the third direction Z. The other plate-shaped portions 22a do not have portions like the hooking portions 25 on both sides in the third direction Z, and the surface of the insertion end of the plate-shaped portion 22a is a flat surface. The rest of the structure of the core 20A is the same as that of the core 20 of the solenoid device 1.

[0047] 5. Method for fixing the solenoid core in solenoid device 2 As shown in Figure 10, in the solenoid core fixing method of Embodiment 2, a bobbin 10 and a core 20A are prepared. In the core 20A, projections 23 are provided on both sides in the third direction Z of only a portion of the plate-like portion 22a of the first core portion 22. The other plate-like portions 22a do not have portions like projections 23 on both sides in the third direction Z, and the surface of the insertion end of the plate-like portion 22a is a flat surface. Therefore, in the core 20A of this embodiment, there are four crimping regions A corresponding to the stacked portions of the multiple projections 23, as shown in Figure 10.

[0048] Subsequently, as in the first embodiment, the punch 30 is lowered toward each crimping region A to perform a plastic deformation step (not shown). As a result of this plastic deformation step, as shown in Figure 11, hook portions 25 are formed on both sides in the third direction Z of only a portion of the plate-like portion 22a of the first core portion 22. This causes the hook portions 25 to catch on the hooked portion 13 of the bobbin 10. Meanwhile, the first core portion 22 is pressed against the inner wall surface 11b of the bobbin 10 at the pressing portion 24.

[0049] 6. Effects In the solenoid device 2 of Embodiment 2, hooking portions 25 are provided on both sides of the third direction Z of only the plate-shaped portions 22a at both ends in the second direction Y of the multiple plate-shaped portions 22a constituting the first core portion 22 of the core 20A, so that the hooking portions 25 can be hooked onto the hooked portion 13 of the bobbin 10. Furthermore, by adopting a structure in which the other plate-shaped portions 22a are sandwiched from both sides in the second direction Y by two plate-shaped portions 22a having hooking portions 25 on both sides in the third direction Z, the number of plate-shaped portions 22a on which hooking portions 25 are provided can be reduced.

[0050] According to the solenoid core fixing method of Embodiment 2, by providing a projection 23 on only some of the plate-shaped portions 22a among the multiple plate-shaped portions 22a constituting the first core portion 22 of the core 20A, and plastically deforming the projection 23 with a punch 30, a hook portion 25 that hooks onto the hooked portion 13 of the bobbin 10 can be formed only on the plate-shaped portions 22a. This makes it possible to reduce the number of plate-shaped portions 22a on which the projection 23 is to be provided in advance.

[0051] Furthermore, it exhibits the same effects and advantages as in Embodiment 1.

[0052] As a particularly relevant modification to Embodiment 2, a structure may be adopted in which the position and number of crimping regions A differ from those in Figure 10.

[0053] 7. Changes The present invention is not limited to the embodiments described above, and various applications and modifications are conceivable as long as they do not depart from the purpose of the present invention. For example, the following embodiments can be implemented by applying the embodiments described above.

[0054] In the above-described embodiment, solenoid devices 1 and 2 suitable for use in electromagnetic pumps were illustrated, but it goes without saying that solenoid devices 1 and 2 can be applied to equipment other than electromagnetic pumps. [Explanation of Symbols]

[0055] 1,2…Solenoid device, 10…Bobbin, 11b…Inner wall surface, 12…Insertion space, 13…Hooked part, 22…First core part (fixing part), 22a…Plate-shaped part, 20,20A…Core, 23…Protrusion, 24…Pressing part, 25…Hooking part, 30…Punch (processing tool), C…Coil, X1…Insertion direction, Y…Second direction (Lamination direction), Z…Third direction (Plate width direction)

Claims

1. A solenoid device comprising a bobbin around which a coil is wound, and a core having a fixing portion that is inserted into and fixed in the insertion space of the bobbin, The bobbin has a hook portion provided at the opening edge of the insertion space, The fixing portion of the core has a pressing portion that is pressed against the inner wall surface that defines the insertion space of the bobbin, and a hooking portion that hooks onto the hooked portion of the bobbin in the insertion direction, in a solenoid device.

2. The hooking portion is formed by plastically deforming a projection provided on the insertion tip side of the fixing portion so as to protrude from the insertion space of the bobbin toward the hooked portion of the bobbin toward the hooked portion, and the pressing portion is formed by the plastic deformation of the projection, as described in claim 1.

3. The fixing portion has a laminated structure in which a plurality of plate-like portions are stacked in the stacking direction, The solenoid device according to claim 1 or 2, wherein the fixing portion has the hooking portion on both sides of the plate width direction of all of the plurality of plate-shaped portions, when the direction perpendicular to both the stacking direction and the insertion direction is defined as the plate width direction of each of the plurality of plate-shaped portions.

4. The fixing portion has a laminated structure in which a plurality of plate-like portions are stacked in the stacking direction, The solenoid device according to claim 1 or 2, wherein the fixing portion has the hooking portions on both sides in the plate width direction of only the plate-shaped portions at both ends of the stacking direction among the plurality of plate-shaped portions, when the direction perpendicular to both the stacking direction and the insertion direction is defined as the plate width direction of each of the plurality of plate-shaped portions.

5. A solenoid core fixing method for fixing a core to a bobbin around which a coil is wound, A hooking portion is provided at the opening edge of the bobbin insertion space, A projection is provided on the insertion tip side of the core fixing portion that protrudes from the insertion space of the bobbin. Insert the fixing portion of the core into the insertion space of the bobbin, A solenoid core fixing method, wherein the projection is deformed outward with a processing tool toward the hooked portion of the bobbin, thereby forming a pressing portion that presses the fixing portion against the inner wall surface that defines the insertion space of the bobbin, and a hooking portion that hooks onto the hooked portion in the insertion direction.

6. The fixing portion has a laminated structure in which a plurality of plate-like portions are stacked in the stacking direction, The protrusions are provided on both sides in the width direction of all of the aforementioned multiple plate-shaped portions. The solenoid core fixing method according to claim 5, wherein when the direction perpendicular to both the stacking direction and the insertion direction is defined as the plate width direction of each of the plurality of plate-shaped portions, the hooking portions are formed on both sides of the plate width direction of all of the plurality of plate-shaped portions by processing the projection portion.

7. The fixing portion has a laminated structure in which a plurality of plate-like portions are stacked in the stacking direction, The protrusions are provided on both sides in the width direction of only the plate-like portions at both ends in the stacking direction among the plurality of plate-like portions. The solenoid core fixing method according to claim 5, wherein when the direction perpendicular to both the stacking direction and the insertion direction is defined as the plate width direction of each of the plurality of plate-shaped portions, the hooking portions are formed on both sides in the plate width direction of only the plate-shaped portions at both ends of the stacking direction among the plurality of plate-shaped portions by processing the protrusions.

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