Electromagnetic device
The electromagnetic device addresses the challenge of securely fixing the coil bobbin to the core by using engaging and locking portions, reducing manufacturing steps and costs, and enhancing stability against external forces.
Patent Information
- Application Number
- PCT/JP2024/020807
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-12-11
AI Technical Summary
Existing electromagnetic devices face challenges in securely fixing the coil bobbin to the core housing without using adhesives, which increases manufacturing steps and costs, and may result in movement of the coil bobbin due to external impacts or vibrations.
The electromagnetic device employs a first engaging portion on the coil bobbin and a first locking portion on the core, which engage without adhesives, using convex and concave shapes to secure the coil bobbin in the core's accommodating portion, preventing axial and circumferential movement.
This method securely fixes the coil bobbin to the core without adhesives, reducing manufacturing complexity and costs while preventing movement, ensuring stable operation under external forces.
Smart Images
Figure JP2024020807_11122025_PF_FP_ABST
Abstract
Description
electromagnetic device
[0001] The present disclosure relates to electromagnetic devices.
[0002] Japanese Utility Model Laid-Open Publication No. 54-32643 discloses an electromagnetic device including a coil bobbin and a core. The coil bobbin is formed in an annular shape. The core includes an annular housing portion. The coil bobbin is housed in the housing portion.
[0003] There is a need for an electromagnetic device that can secure the coil bobbin to the core housing in a good manner.
[0004] An electromagnetic device according to one aspect of the present disclosure comprises a circular coil bobbin and a core having a circular accommodating portion in which the coil bobbin is accommodated, wherein a first engaging portion is provided on the inner surface of the body of the coil bobbin, and a first locking portion that locks the first engaging portion is provided on the outer surface of a central convex portion that defines the accommodating portion.
[0005] FIG. 1 is an exploded perspective view of an electromagnetic device according to one embodiment. FIG. 2 is a cross-sectional view of the electromagnetic device of FIG. 1. FIG. 3 is an exploded perspective view of a first modified example. FIG. 4 is a cross-sectional view of the first modified example. FIG. 5 is a cross-sectional view of a second modified example. FIG. 6 is a plan view of a third modified example. FIG. 7 is a perspective view of a fourth modified example. FIG. 8 is a perspective view of a fifth modified example. FIG. 9 is a perspective view of a sixth modified example. FIG. 10 is a perspective view of a seventh modified example.
[0006] The electromagnetic device includes a coil bobbin and a core. The coil bobbin is formed in an annular shape. The core includes an annular receiving portion. The coil bobbin is received in the receiving portion.
[0007] The following first to third methods can be used to fix the coil bobbin in the housing of the core.
[0008] In the first technique, a resin or adhesive is filled into the gap between the coil bobbin and the core in the housing portion while the coil bobbin is housed in the housing portion, and the filled resin or adhesive is solidified to fix the coil bobbin in the housing portion.
[0009] In the second technique, a protrusion is provided on the inner peripheral surface of the body of the coil bobbin. When the coil bobbin is accommodated in the accommodation portion, the protrusion is compressed in the radial direction of the coil bobbin against the outer peripheral surface of the central protrusion that defines the accommodation portion of the core. Movement of the coil bobbin relative to the core is restricted by a reaction force against the compressive stress acting on the protrusion from the central protrusion and a frictional force between the protrusion and the central protrusion.
[0010] In the third method, the convex portion is compressed radially of the core against the outer peripheral surface of the central convex portion as in the second method, and resin or adhesive is filled into the gap between the coil bobbin and the core in the accommodating portion as in the first method.
[0011] However, the first and third methods require the step of filling the housing with resin or adhesive, which increases the number of steps in manufacturing the electromagnetic device and increases the manufacturing cost of the electromagnetic device.
[0012] In the second technique, the coil bobbin contacts the core via the protrusion, so that when the electromagnetic device receives an external impact or vibrates, the coil bobbin may move in the axial and circumferential directions of the electromagnetic device.
[0013] In the electromagnetic device of the present disclosure, the coil bobbin can be successfully secured to the core housing without the use of adhesive, as will be described in more detail below.
[0014] [One embodiment] Fig. 1 is an exploded perspective view of an electromagnetic device 10 according to one embodiment. Fig. 2 is a cross-sectional view of the electromagnetic device 10 according to one embodiment.
[0015] The electromagnetic device 10 is, for example, an electromagnetic brake 12. The electromagnetic brake 12 limits the rotation of a shaft (not shown).
[0016] The electromagnetic device 10 includes a coil 14, a coil bobbin 16, a core 18, and an armature 20. Note that the coil 14 and the armature 20 are not shown in FIG.
[0017] 1 and 2 , the coil bobbin 16 is formed in a circular ring shape. The coil bobbin 16 is made of an electrically insulating material. Specifically, the coil bobbin 16 is made of a flexible material. More specifically, the coil bobbin 16 is made of, for example, a resin material. The coil bobbin 16 includes a body portion 22 and a pair of flange portions 24.
[0018] The body portion 22 is formed in a cylindrical shape. As will be described later, the coil bobbin 16 is housed in a housing portion 36 provided in the core 18. When the coil bobbin 16 is housed in the housing portion 36, an axis 26 of the electromagnetic device 10 is substantially coaxial with an axis 25 of the coil bobbin 16 and an axis 27 of the core 18.
[0019] The pair of flanges 24 are provided at both ends of the body portion 22 in the axial direction of the coil bobbin 16. The pair of flanges 24 protrude from both ends of the body portion 22 in the radial direction of the coil bobbin 16. Each of the pair of flanges 24 is formed in an annular shape. The radial direction of the coil bobbin 16 is a direction perpendicular to the axis 25 (see FIG. 2 ) of the coil bobbin 16.
[0020] The first flange 24a, which is one of the pair of flanges 24, protrudes from one end of the body 22 in the radial direction of the coil bobbin 16. The second flange 24b, which is the other of the pair of flanges 24, protrudes from the other end of the body 22 in the radial direction of the coil bobbin 16.
[0021] The coil 14 is wound around the trunk portion 22. The conductor wire wound around the trunk portion 22 constitutes the coil winding 28. Specifically, the coil 14 is constituted by the coil winding 28 formed by winding the conductor wire around the portion of the outer circumferential surface of the trunk portion 22 between the first flange portion 24 a and the second flange portion 24 b.
[0022] Both ends of the coil winding 28 can be drawn out to the outside of the electromagnetic device 10 via lead-out portions (not shown) provided on the second flange portion 24b. Alternatively, a notch (not shown) may be formed in the outer circumferential portion 42 of the core 18 (described later), and both ends of the coil winding 28 may be drawn out to the outside of the electromagnetic device 10 through the notch.
[0023] A first engagement portion 32 is provided on the inner circumferential surface 30 of the body portion 22. The first engagement portion 32 is provided in a region between one end of the body portion 22 and the other end of the body portion 22.
[0024] The first engaging portion 32 is formed in a convex shape. Specifically, the first engaging portion 32 is a first convex portion 34 that protrudes from the inner circumferential surface 30 of the body portion 22 toward the inside in the radial direction of the coil bobbin 16.
[0025] The core 18 is formed in an annular shape. The core 18 is made of a magnetic material such as iron. The core 18 includes a housing portion 36. The housing portion 36 is formed in an annular shape. The housing portion 36 is formed coaxially with the axis 27 of the core 18 (see FIG. 2 ). The housing portion 36 is an annular recess that is recessed along the axis 27 of the core 18.
[0026] The accommodation portion 36 is defined by a central protrusion 38, a bottom portion 40, and an outer periphery 42. The central protrusion 38, the bottom portion 40, and the outer periphery 42 are integrally formed.
[0027] The bottom portion 40 is an annular plate-shaped portion that is perpendicular to the axis 27 of the core 18 .
[0028] The central protrusion 38 is a cylindrical portion that extends from the inside of the bottom portion 40 along the axis 27 of the core 18. An outer peripheral surface 46 of the central protrusion 38 forms the inner peripheral surface of the accommodating portion 36. The central protrusion 38 constitutes the inner peripheral wall of the core 18. A tapered portion (tapered surface) 50 (see FIG. 2 ) is formed on the outer peripheral surface 46 of the central protrusion 38. The tapered portion 50 is located at the tip of the central protrusion 38.
[0029] A first locking portion 52 is provided on the outer peripheral surface 46 of the central protrusion 38. The first locking portion 52 is located between the tapered portion 50 and the bottom surface 44. The first locking portion 52 is formed on the outer peripheral surface 46 of the central protrusion 38 so that the first engaging portion 32 and the first locking portion 52 can face each other in the radial direction of the electromagnetic device 10 when the coil bobbin 16 is accommodated in the accommodation portion 36.
[0030] The first locking portion 52 is formed in a concave shape. The first locking portion 52 is a first recess 54 that is recessed from the outer circumferential surface 46 of the central protrusion 38 toward the inside in the radial direction of the core 18.
[0031] The outer peripheral portion 42 is the outer peripheral wall of the core 18. The outer peripheral portion 42 is a cylindrical portion that extends from the bottom portion 40 along the axis 27 of the core 18, radially outward of the core 18 relative to the central convex portion 38. The inner peripheral surface of the outer peripheral portion 42 forms the outer peripheral surface of the accommodating portion 36.
[0032] The portion of the surface of the bottom portion 40 between the central convex portion 38 and the outer periphery 42 forms a bottom surface 44 of the storage portion 36. The bottom surface 44 of the storage portion 36 is formed in an annular shape.
[0033] The accommodation portion 36 accommodates the coil bobbin 16. When the coil bobbin 16 is accommodated in the accommodation portion 36, the first flange portion 24a is located at the bottom of the accommodation portion 36. More specifically, the first flange portion 24a contacts the bottom surface 44. The inner peripheral surface 30 of the body portion 22 is in surface contact with the outer peripheral surface 46 of the central protrusion 38. The first engagement portion 32 is engaged by the first locking portion 52. More specifically, the first protrusion 34 fits into the first recess 54.
[0034] The dimensions of the accommodating portion 36 are set so that it can accommodate the coil bobbin 16. As shown in FIG. 2, the inner diameter D1 of the outer peripheral portion 42 is equal to or greater than the outer diameter D2 of the coil bobbin 16 (D1≧D2). The depth L1 of the accommodating portion 36 in the axial direction of the core 18 is equal to or greater than the dimension L2 of the coil bobbin 16 in the axial direction of the coil bobbin 16 (L1≧L2). The outer diameter D3 of the central protrusion 38 is equal to the inner diameter D4 of the coil bobbin 16 (see FIG. 1) (D3=D4), but is not limited thereto. Here, an example will be described in which the inner diameter D4 of the coil bobbin 16 is set slightly smaller than the outer diameter D3 of the central protrusion 38.
[0035] The armature 20 is formed in an annular shape. The armature 20 is made of a magnetic material. The armature 20 is disposed so as to face the second flange 24b of the coil bobbin 16 housed in the housing portion 36. The armature 20 is disposed coaxially with the core 18. The armature 20 is connected to the core 18 via a spring member (not shown).
[0036] Next, a method for manufacturing the electromagnetic device 10 will be described.
[0037] First, the worker prepares the coil bobbin 16 around which the coil 14 is wound, and the core 18 .
[0038] Next, with the first flange 24a and the accommodating portion 36 facing each other, the worker presses the coil bobbin 16 into the accommodating portion 36. As described above, the inner diameter D4 of the coil bobbin 16 is slightly smaller than the outer diameter D3 of the central protrusion 38. The worker brings the inside of the first flange 24a into contact with the tip of the central protrusion 38, and then presses the coil bobbin 16 into the accommodating portion 36. As a result, the body 22 expands radially outward from the coil bobbin 16, while the coil bobbin 16 is pressed into the accommodating portion 36.
[0039] When the worker pushes the coil bobbin 16 further into the accommodation portion 36, the first engagement portion 32 is positioned within the accommodation portion 36. As described above, the tapered portion 50 is formed on the tip side of the outer circumferential surface 46 of the central convex portion 38. This allows the first engagement portion 32 to be positioned in the accommodation portion 36 without being damaged.
[0040] When the worker pushes the coil bobbin 16 further into the housing portion 36, the first flange portion 24a comes into contact with the bottom surface 44 of the housing portion 36. As a result, the coil 14 and the coil bobbin 16 are housed in the housing portion 36, and the coil 14 and the coil bobbin 16 are arranged approximately coaxially with respect to the core 18.
[0041] At this time, the first engaging portion 32 and the first locking portion 52 face each other in the radial direction of the electromagnetic device 10, and the first engaging portion 32 is locked to the first locking portion 52. That is, the first convex portion 34 is positioned in the first concave portion 54. More specifically, the first convex portion 34 fits into the first concave portion 54. This fixes the coil bobbin 16 inside the accommodating portion 36. The coil bobbin 16 is positioned with respect to the core 18 in the axial direction of the electromagnetic device 10, and is also positioned with respect to the core 18 in the circumferential direction of the electromagnetic device 10 (the direction around the axis 26). As a result, it is possible to prevent the coil bobbin 16 from moving in the axial and circumferential directions of the electromagnetic device 10 relative to the core 18.
[0042] Next, the worker attaches the armature 20 to the core 18. Furthermore, the worker inserts a shaft into the inner hole 60 of the core 18. A disk (not shown) is connected to the shaft.
[0043] The operation of the electromagnetic device 10 will now be described.
[0044] When the coil 14 is not energized, the elastic force of the spring member causes the armature 20 to move away from the core 18 in the axial direction of the electromagnetic device 10. As a result, the armature 20 presses the disk in the axial direction of the electromagnetic device 10. The armature 20 presses the disk, thereby restricting the rotation of the shaft.
[0045] When the coil 14 is energized, a magnetic field is generated around the coil 14. A force (electromagnetic force) acting in response to the magnetic field generated around the coil 14 moves the armature 20 closer to the core 18 against the elastic force of the spring member. This separates the armature 20 from the disk. As a result, the shaft can rotate freely.
[0046] In the above description, the first engaging portion 32 is formed in a convex shape and the first locking portion 52 is formed in a concave shape, but this is not limiting. The first engaging portion 32 may be formed in a concave shape and the first locking portion 52 may be formed in a convex shape. That is, it is sufficient that one of the first engaging portion 32 and the first locking portion 52 is formed in a convex shape and the other of the first engaging portion 32 and the first locking portion 52 is formed in a concave shape.
[0047] The effects of the embodiment will be described.
[0048] 1 and 2 , the inner circumferential surface 30 of the body portion 22 of the coil bobbin 16 is provided with a first engaging portion 32. Furthermore, the outer circumferential surface 46 of the central protrusion 38 that defines the accommodating portion 36 of the core 18 is provided with a first locking portion 52 that locks with the first engaging portion 32. As a result, when the coil bobbin 16 is accommodated in the accommodating portion 36, the first locking portion 52 locks with the first engaging portion 32. As a result, the coil bobbin 16 accommodated in the accommodating portion 36 can be prevented from moving in the axial and circumferential directions of the electromagnetic device 10. Therefore, in one embodiment, the coil bobbin 16 can be securely fixed to the accommodating portion 36 of the core 18 without using an adhesive.
[0049] Furthermore, one of the first engaging portion 32 and the first locking portion 52 is formed in a convex shape, and the other of the first engaging portion 32 and the first locking portion 52 is formed in a concave shape, which allows the first locking portion 52 to lock the first engaging portion 32 even more effectively.
[0050] Because the coil bobbin 16 is made of a resin material, the first engaging portion 32 can be easily formed into a convex shape by resin molding. Also, because the core 18 is made of a magnetic material such as iron, the first locking portion 52 can be easily formed into a concave shape by cutting or the like. As a result, the electromagnetic device 10 can be easily manufactured, and the manufacturing cost of the electromagnetic device 10 can be reduced.
[0051] When current is applied to the coil 14 wound around the body 22 of the coil bobbin 16, a magnetic field is generated around the coil 14, and the armature 20 can be easily driven by the force acting in response to the generated magnetic field.
[0052] Next, modified examples (first to seventh modified examples) of the electromagnetic device 10 of one embodiment will be described with reference to Figures 3 to 10. Note that, among the components of each modified example, the same components as those in the above embodiment (see Figures 1 and 2) are designated by the same reference numerals, and detailed description thereof will be omitted.
[0053] 3 and 4 , in the first modification, the first engaging portion 32 provided on the inner peripheral surface 30 of the body portion 22 is formed along the circumferential direction of the coil bobbin 16. That is, the first convex portion 34 is formed in an annular shape along the circumferential direction of the coil bobbin 16. The first locking portion 52 provided on the outer peripheral surface 46 of the central convex portion 38 is formed along the circumferential direction of the core 18. That is, the first recessed portion 54 is formed in an annular shape along the circumferential direction of the core 18.
[0054] 4, the first protrusion 34 has an inclined surface 34a that is inclined along the axial direction of the coil bobbin 16. Specifically, the protrusion amount of the first protrusion 34 gradually decreases from the second flange 24b toward the first flange 24a. In addition, both ends of the body 22 are chamfered.
[0055] 3 and 4 , in the first modified example, the flange 24 of the coil bobbin 16 is provided with a second engagement portion 70. Specifically, the first flange 24a is provided with the second engagement portion 70. The second engagement portion 70 is provided on the first flange 24a so as to face the bottom surface 44 of the accommodating portion 36. The second engagement portion 70 is formed in a convex shape. The second engagement portion 70 is a second convex portion 74 that protrudes from the first flange 24a along the axial direction of the coil bobbin 16.
[0056] In the first modified example, a second locking portion 72 is provided on the bottom surface 44 of the accommodating portion 36. The second locking portion 72 locks the second engaging portion 70. Specifically, the second locking portion 72 is provided on the bottom surface 44 of the accommodating portion 36 so as to face the second engaging portion 70 when the coil bobbin 16 is accommodated in the accommodating portion 36. The second locking portion 72 is formed in a concave shape. The second locking portion 72 is a second recess 76 that is recessed from the bottom surface 44 along the axial direction of the core 18.
[0057] As described above, in the first modified example, both end portions of the body portion 22 are chamfered on the inner circumferential surface 30 of the body portion 22. This allows the coil bobbin 16 to be press-fitted into the accommodating portion 36 without damaging the body portion 22.
[0058] In the first modified example, a tapered portion 50 is formed on the tip side of the outer circumferential surface 46 of the central protrusion 38. Also, an inclined surface 34a is formed on the first engagement portion 32. As a result, when the coil bobbin 16 is press-fitted into the accommodating portion 36, the first engagement portion 32 is accommodated in the accommodating portion 36 along the tapered portion 50. As a result, the first engagement portion 32 can be accommodated in the accommodating portion 36 without being damaged.
[0059] In the first variant, the first engagement portion 32 is engaged with the first locking portion 52 (the first convex portion 34 is fitted into the first concave portion 54), thereby restricting the coil bobbin 16 from moving in the axial direction of the electromagnetic device 10 relative to the core 18.
[0060] Furthermore, in the first modified example, when the first flange 24a abuts against the bottom surface 44 of the accommodation portion 36, the second engagement portion 70 is locked by the second locking portion 72. That is, the second convex portion 74 fits into the second concave portion 76. This makes it possible to restrict movement of the coil bobbin 16 relative to the core 18 in the circumferential direction of the electromagnetic device 10.
[0061] In the above description, the first engaging portion 32 and the first locking portion 52 are formed along the circumferential direction of the electromagnetic device 10, but this is not limiting. At least one of the first engaging portion 32 and the first locking portion 52 may be formed along the circumferential direction of the electromagnetic device 10. For example, only the first locking portion 52 may be formed along the circumferential direction of the core 18.
[0062] In the above description, the second engaging portion 70 is formed in a convex shape and the second locking portion 72 is formed in a concave shape, but this is not limiting. It is sufficient that one of the second engaging portion 70 and the second locking portion 72 is formed in a convex shape and the other is formed in a concave shape. For example, the second engaging portion 70 is formed in a concave shape and the second locking portion 72 is formed in a convex shape.
[0063] Furthermore, the first engaging portion 32 and the second engaging portion 70 may be integrally formed in the coil bobbin 16. That is, the first engaging portion 32 and the second engaging portion 70 may be connected to each other. In this case, the first locking portion 52 and the second locking portion 72 are integrally formed in the core 18 to match the shapes of the first engaging portion 32 and the second engaging portion 70.
[0064] The effects of the first modified example will be described.
[0065] 3 and 4 , the first flange 24a of the coil bobbin 16 is provided with a second engaging portion 70. The bottom surface 44 of the accommodating portion 36 is provided with a second locking portion 72 that locks the second engaging portion 70. This effectively prevents the coil bobbin 16 from moving relative to the core 18 in the circumferential direction of the electromagnetic device 10 when the second locking portion 72 locks the second engaging portion 70.
[0066] At least one of the first engaging portion 32 and the first locking portion 52 is formed along the circumferential direction of the electromagnetic device 10. This effectively prevents the coil bobbin 16 from moving in the axial direction of the electromagnetic device 10 relative to the core 18 when the first locking portion 52 locks the first engaging portion 32.
[0067] One of the second engaging portion 70 and the second locking portion 72 is formed in a convex shape, and the other is formed in a concave shape, so that the second engaging portion 70 can be locked by the second locking portion 72 in a good manner.
[0068] 5, in a second modified example, a plurality of first engaging portions 32 are provided on the inner circumferential surface 30 of the body portion 22. The plurality of first engaging portions 32 are provided at intervals in the axial direction of the coil bobbin 16. Specifically, as shown in FIG. 5, five first engaging portions 32 (first protrusions 34) are provided on the inner circumferential surface 30 of the body portion 22.
[0069] 5, an annular protrusion 77 is provided at the other end of the body portion 22. The protrusion 77 protrudes from the other end of the body portion 22 in the axial direction of the coil bobbin 16. The protrusion 77 is part of the body portion 22. The inner circumferential surface of the protrusion 77 is part of the inner circumferential surface 30 of the body portion 22. One of the multiple first engagement portions 32 is provided on the inner circumferential surface of the protrusion 77.
[0070] The outer peripheral surface 46 of the central protrusion 38 is provided with a plurality of first locking portions 52 that lock the plurality of first engagement portions 32. More specifically, as shown in Figure 5, five first locking portions 52 (first recesses 54) are provided on the outer peripheral surface 46 of the central protrusion 38.
[0071] The first flange 24a is provided with a plurality of second engagement portions 70. The plurality of second engagement portions 70 are provided at intervals in the radial direction of the coil bobbin 16. More specifically, as shown in Fig. 5, three second engagement portions 70 (second protrusions 74) that protrude along the axial direction of the coil bobbin 16 are provided on the first flange 24a.
[0072] The bottom surface 44 of the accommodating portion 36 is provided with a plurality of second locking portions 72 that lock the plurality of second engaging portions 70. More specifically, as shown in Fig. 5, three second locking portions 72 (second recesses 76) recessed along the axial direction of the core 18 are provided on the bottom surface 44 of the accommodating portion 36.
[0073] As described above, in the second modified example, the plurality of first engaging portions 32 are locked by the plurality of first locking portions 52. This effectively prevents the coil bobbin 16 from moving in the axial direction of the electromagnetic device 10 relative to the core 18. Furthermore, the plurality of second engaging portions 70 are locked by the plurality of second locking portions 72, effectively preventing the coil bobbin 16 from moving in the circumferential direction of the electromagnetic device 10 relative to the core 18.
[0074] 6, in a third modified example, a plurality of first engagement portions 32 are provided at intervals in the circumferential direction of the coil bobbin 16 on the inner circumferential surface 30 of the trunk portion 22. The plurality of first engagement portions 32 are formed in an arc shape along the circumferential direction of the coil bobbin 16. Specifically, as shown in FIG. 6, three first engagement portions 32 are provided on the inner circumferential surface 30 of the trunk portion 22.
[0075] In the third modified example, when the coil bobbin 16 is accommodated in the accommodation portion 36 (see FIGS. 4 and 5 ), the plurality of first engagement portions 32 are engaged with the single annular first locking portion 52. This effectively prevents the coil bobbin 16 from moving relative to the core 18 in the axial direction of the electromagnetic device 10.
[0076] 7 , in a fourth modified example, an operated portion 80 is formed on the flange 24. Specifically, the operated portion 80 is formed on the second flange 24b. The operated portion 80 can be used to attach or detach the coil bobbin 16 to or from the accommodating portion 36. More specifically, an operator manually operates the operated portion 80 to attach or detach the coil bobbin 16 to or from the accommodating portion 36. Alternatively, an operator operates the operated portion 80 using a tool (not shown) to attach or detach the coil bobbin 16 to or from the accommodating portion 36.
[0077] The operated portion 80 protrudes from the second flange 24b along the axial direction of the coil bobbin 16. The operated portion 80 is formed in a convex shape on the second flange 24b along the axial direction of the coil bobbin 16. The operated portion 80 is a third convex portion 82 formed on the second flange 24b. Figure 7 shows a case where two operated portions 80 are provided on the second flange 24b.
[0078] When the coil bobbin 16 is press-fitted into the accommodating portion 36, if the first engaging portion 32 (see FIGS. 1 to 5) and the first locking portion 52 do not face each other in the radial direction of the electromagnetic device 10, the first locking portion 52 cannot lock the first engaging portion 32. Furthermore, if the second engaging portion 70 (see FIGS. 3 to 5) and the second locking portion 72 do not face each other in the axial direction of the electromagnetic device 10, the second locking portion 72 cannot lock the second engaging portion 70.
[0079] The operator applies force to the operated portion 80 in the circumferential direction of the electromagnetic device 10, thereby rotating the coil bobbin 16 in the circumferential direction of the electromagnetic device 10. When the coil bobbin 16 rotates in the circumferential direction of the electromagnetic device 10 and the first engaging portion 32 and the first locking portion 52 face each other in the radial direction of the electromagnetic device 10, the first engaging portion 32 can be locked by the first locking portion 52. Furthermore, when the coil bobbin 16 rotates in the circumferential direction of the electromagnetic device 10 and the second engaging portion 70 and the second locking portion 72 face each other in the axial direction of the electromagnetic device 10, the second engaging portion 70 can be locked by the second locking portion 72.
[0080] Furthermore, when an operator grasps the operated portion 80 and pulls the coil bobbin 16 in the direction opposite to the direction in which the coil bobbin 16 is press-fitted into the core 18 , the coil bobbin 16 can be pulled out from the core 18 .
[0081] The effects of the fourth modification will be described.
[0082] The second flange 24b provided on the coil bobbin 16 is formed with an operated portion 80 that can be used to attach and detach the coil bobbin 16 to and from the accommodating portion 36. This allows the worker to easily attach and detach the coil bobbin 16 to and from the core 18 by operating the operated portion 80.
[0083] Furthermore, since the coil bobbin 16 is fixed to the housing portion 36 without using adhesive, the coil bobbin 16 can be easily attached to and detached from the core 18. This allows the coil bobbin 16 to be attached to and detached from the core 18 without incurring additional costs.
[0084] Furthermore, the operated portion 80 (third protrusion 82) protrudes from the second flange 24b along the axial direction of the coil bobbin 16. This allows the worker to easily attach or detach the coil bobbin 16 to or from the core 18 by grasping the operated portion 80.
[0085] 8 , in the fifth modification, the operated portion 80 is formed in a concave shape. Alternatively, the operated portion 80 is a through-hole 84. Specifically, the operated portion 80 is a hole 86 recessed in the axial direction of the coil bobbin 16, or a through-hole 84 that penetrates in the axial direction.
[0086] In the fifth modified example, with a tool hooked on the hole 86 or the through-hole 84, the worker applies force to the second flange 24b in the circumferential direction of the electromagnetic device 10, thereby rotating the coil bobbin 16 in the circumferential direction of the electromagnetic device 10. When the coil bobbin 16 rotates in the circumferential direction of the electromagnetic device 10 and the first engaging portion 32 (see FIGS. 1 to 5 ) and the first locking portion 52 face each other in the radial direction of the electromagnetic device 10, the first engaging portion 32 can be locked by the first locking portion 52. Furthermore, when the coil bobbin 16 rotates in the circumferential direction of the electromagnetic device 10 and the second engaging portion 70 and the second locking portion 72 face each other in the axial direction of the electromagnetic device 10, the second engaging portion 70 can be locked by the second locking portion 72.
[0087] In addition, in the fifth variant, when the worker hooks a tool into the hole 86 or the through hole 84 and pulls the coil bobbin 16 in the direction opposite to the direction in which the coil bobbin 16 is pressed into the core 18, the coil bobbin 16 can be pulled out from the core 18.
[0088] In this way, in the fifth modified example, the worker can easily attach and detach the coil bobbin 16 to and from the core 18 by hooking a tool into the hole 86 or the through-hole 84 .
[0089] 9 , in the sixth modification, the operated portion 80 is a notch 88. The notch 88 is formed in the outer periphery of the second flange 24 b. The notch 88 is formed so as to be recessed in the radial direction of the coil bobbin 16.
[0090] In the sixth modified example, with the tool hooked on the notch 88, the worker applies force to the second flange 24b in the circumferential direction of the electromagnetic device 10, thereby rotating the coil bobbin 16 in the circumferential direction of the electromagnetic device 10. When the coil bobbin 16 rotates in the circumferential direction of the electromagnetic device 10 and the first engaging portion 32 (see FIGS. 1 to 5 ) and the first locking portion 52 face each other in the radial direction of the electromagnetic device 10, the first engaging portion 32 can be locked by the first locking portion 52. Furthermore, when the coil bobbin 16 rotates in the circumferential direction of the electromagnetic device 10 and the second engaging portion 70 and the second locking portion 72 face each other in the axial direction of the electromagnetic device 10, the second engaging portion 70 can be locked by the second locking portion 72.
[0091] In addition, in the sixth variant, when the worker hooks a tool onto the notch 88 and pulls the coil bobbin 16 in the direction opposite to the direction in which the coil bobbin 16 is pressed into the core 18, the coil bobbin 16 can be pulled out from the core 18.
[0092] In this way, in the sixth modified example, the worker can easily attach and detach the coil bobbin 16 to and from the core 18 by hooking a tool into the notch 88 .
[0093] 10 , in the seventh modification, the operated portion 80 is a fourth protrusion 90. The fourth protrusion 90 is formed on the outer periphery of the second flange 24 b. The fourth protrusion 90 is formed to protrude in the radial direction of the coil bobbin 16.
[0094] In the seventh modified example, with a tool hooked on the fourth protrusion 90, the worker applies force to the second flange 24b in the circumferential direction of the electromagnetic device 10, thereby rotating the coil bobbin 16 in the circumferential direction of the electromagnetic device 10. When the coil bobbin 16 rotates in the circumferential direction of the electromagnetic device 10, the first engaging portion 32 (see FIGS. 1 to 5 ) and the first locking portion 52 face each other in the radial direction of the electromagnetic device 10, and the first engaging portion 32 can be locked by the first locking portion 52. Furthermore, when the coil bobbin 16 rotates in the circumferential direction of the electromagnetic device 10, the second engaging portion 70 and the second locking portion 72 face each other in the axial direction of the electromagnetic device 10, and the second engaging portion 70 can be locked by the second locking portion 72.
[0095] In addition, in the seventh variant, when an operator hooks a tool onto the fourth protrusion 90 and pulls the coil bobbin 16 in the direction opposite to the direction in which the coil bobbin 16 is pressed into the core 18, the coil bobbin 16 can be pulled out from the core 18.
[0096] In this way, in the seventh modified example, the worker can easily attach and detach the coil bobbin 16 to and from the core 18 by hooking a tool on the fourth protrusion 90 .
[0097] [Additional Notes] The following additional notes are disclosed regarding the above embodiment.
[0098] (Supplementary Note 1) The electromagnetic device (10) of the present disclosure comprises an annular coil bobbin (16) and a core (18) provided with an annular accommodating section (36) in which the coil bobbin is accommodated, and a first engaging section (32) is provided on an inner peripheral surface (30) of a body section (22) of the coil bobbin, and a first locking section (52) that locks the first engaging section is provided on an outer peripheral surface (46) of a central protrusion (38) that defines the accommodating section.
[0099] (Appendix 2) In the electromagnetic device described in Appendix 1, one of the first engaging portion and the first locking portion may be formed in a convex shape, and the other of the first engaging portion and the first locking portion may be formed in a concave shape.
[0100] (Supplementary Note 3) In the electromagnetic device described in Supplementary Note 2, the coil bobbin may be made of a resin material, the first engaging portion may be formed in the convex shape, and the first locking portion may be formed in the concave shape.
[0101] (Supplementary Note 4) The electromagnetic device according to any one of Supplementary Notes 1 to 3 may further include an armature (20) that is driven by a force generated when a current is passed through a coil (14) wound around the body portion of the coil bobbin.
[0102] (Appendix 5) In the electromagnetic device described in any one of Appendices 1 to 4, the flange portion (24) provided on the coil bobbin may be provided with a second engaging portion (70), and the bottom surface (44) of the accommodating portion may be provided with a second locking portion (72) that locks the second engaging portion.
[0103] (Supplementary Note 6) In the electromagnetic device described in Supplementary Note 5, at least one of the first engaging portion and the first locking portion may be formed along a circumferential direction.
[0104] (Appendix 7) In the electromagnetic device described in Appendix 5 or 6, one of the second engaging portion and the second locking portion may be formed in a convex shape, and the other of the second engaging portion and the second locking portion may be formed in a concave shape.
[0105] (Appendix 8) In the electromagnetic device described in any one of Appendices 1 to 7, the flange portion provided on the coil bobbin may be formed with an operated portion (80) that can be used to attach and detach the coil bobbin to and from the accommodating portion.
[0106] (Supplementary Note 9) In the electromagnetic device described in Supplementary Note 8, the operated portion may protrude from the flange portion along the axial direction of the coil bobbin.
[0107] (Supplementary Note 10) In the electromagnetic device described in Supplementary Note 8, the operated portion may protrude from the flange portion along a radial direction of the coil bobbin.
[0108] (Supplementary Note 11) In the electromagnetic device described in Supplementary Note 8, the operated portion may be formed in a concave shape.
[0109] (Supplementary Note 12) In the electromagnetic device described in Supplementary Note 8, the operated portion may be a notch (88).
[0110] (Supplementary Note 13) In the electromagnetic device described in Supplementary Note 8, the operated portion may be a through hole (84).
[0111] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values or mathematical expressions are used in the description of the above-described embodiments.
[0112] REFERENCE SIGNS LIST 10...Electromagnetic device 14...Coil 16...Coil bobbin 18...Core 20...Armature 22...Body portion 24...Flange portion 30...Inner peripheral surface 32...First engaging portion 36...Accommodating portion 38...Central convex portion 44...Bottom surface 46...Outer peripheral surface 52...First locking portion 70...Second engaging portion 72...Second locking portion 80...Operated portion 84...Through hole 88...Notch
Claims
1. An electromagnetic device comprising: a circular coil bobbin; and a core having a circular accommodation portion in which the coil bobbin is accommodated; wherein a first engaging portion is provided on the inner peripheral surface of the body portion of the coil bobbin; and a first locking portion that locks the first engaging portion is provided on the outer peripheral surface of a central protrusion that defines the accommodation portion.
2. An electromagnetic device as described in claim 1, wherein one of the first engaging portion and the first locking portion is formed in a convex shape, and the other of the first engaging portion and the first locking portion is formed in a concave shape.
3. An electromagnetic device according to claim 2, wherein the coil bobbin is made of a resin material, the first engaging portion is formed in the convex shape, and the first locking portion is formed in the concave shape.
4. An electromagnetic device according to any one of claims 1 to 3, further comprising an armature that is driven by a force generated when a current is passed through the coil wound around the body of the coil bobbin.
5. An electromagnetic device according to any one of claims 1 to 4, wherein the flange provided on the coil bobbin is provided with a second engaging portion, and the bottom surface of the accommodating portion is provided with a second locking portion that locks the second engaging portion.
6. An electromagnetic device according to claim 5, wherein at least one of the first engaging portion and the first locking portion is formed along the circumferential direction.
7. An electromagnetic device according to claim 5 or 6, wherein one of the second engaging portion and the second locking portion is formed in a convex shape, and the other of the second engaging portion and the second locking portion is formed in a concave shape.
8. An electromagnetic device according to any one of claims 1 to 7, wherein the flange provided on the coil bobbin is formed with an operated part that can be used to attach and detach the coil bobbin to and from the accommodating part.
9. An electromagnetic device according to claim 8, wherein the operated portion protrudes from the flange portion along the axial direction of the coil bobbin.
10. An electromagnetic device according to claim 8, wherein the operated portion protrudes from the flange portion along the radial direction of the coil bobbin.
11. An electromagnetic device according to claim 8, wherein the operated portion is formed in a concave shape.
12. An electromagnetic device according to claim 8, wherein the operated portion is a notch.
13. An electromagnetic device according to claim 8, wherein the operated portion is a through hole.
Citation Information
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