JP2014236128A - Coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil device with excellent insulation properties and reliability which is used as an on-vehicle transformer and the like.SOLUTION: A coil device comprises: a bobbin 20 provided with a bobbin through-hole 21 in the inside and having a cylinder portion 22 around which a winding wire is wound on the outer periphery; a case 60 which is fitted to cover the cylinder portion 22 from above, and which has a protruding cover portion 62 provided with a case through-hole 61 communicating to the bobbin through-hole 21; and a magnetic core 90 having a center leg portion 94. With the case 60 fitted to the bobbin 20, the center leg portion 94 of the magnetic core 90 is inserted into the bobbin through-hole 21 via the case through-hole 61. In this instance, the opening width or the opening height of the case through-hole 61 is greater than the opening width or the opening height of the bobbin through-hole 21.

Description

  The present invention relates to a coil device excellent in insulation and reliability used as a vehicle-mounted transformer or the like.

  As a transformer excellent in insulation, for example, a transformer shown in Patent Document 1 below is known. In this transformer, a bobbin around which a winding wire is wound is covered with a case, and a middle leg portion of a magnetic core is inserted into a through-hole formed in the case and the bobbin.

  However, such a conventional transformer has a structure in which it is difficult to confirm whether the bobbin, the case, and the magnetic core are well bonded or not, and the bonding state can be easily checked during assembly. However, there is a problem that it is inferior in reliability. In particular, in a coil device used for a vehicle-mounted transformer or the like, an adhesive strength is required so that components do not separate even when a vibration acts.

Japanese Utility Model Publication No. 4-117421

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a coil device excellent in insulation and reliability used as a vehicle-mounted transformer or the like.

In order to achieve the above object, a coil device according to the present invention comprises:
A bobbin having a cylindrical portion in which a bobbin through hole is formed inside and a winding wire is wound around the outer periphery;
A case having a convex cover part that is mounted so as to cover at least the cylinder part from above and in which a case through hole communicating with the bobbin through hole is formed;
A coil device having a magnetic core having at least a middle leg portion,
In a state where the case is attached to the bobbin, a middle leg portion of the magnetic core is inserted into the bobbin through hole through the case through hole,
The opening width or opening height of the case through hole is larger than the opening width or opening height of the bobbin through hole, respectively.

  In the coil device according to the present invention, the opening width or opening height of the case through hole is larger than the opening width or opening height of the bobbin through hole. Therefore, when adhesive is applied along the upper surface of the base part that is integrally molded with the middle leg part of the magnetic core, with the middle leg part of the magnetic core inserted into the bobbin through hole through the case through hole. In addition, the case, the bobbin and the magnetic core can be bonded simultaneously by the adhesive.

  Therefore, the coil device of the present invention is excellent in adhesion workability. In addition, since the opening width or opening height of the case through hole is larger than the opening width or opening height of the bobbin through hole, the case and the bobbin are strengthened by applying an adhesive to the portions having different sizes. Can be glued. Further, since the adhesive is applied to the upper surface of the base portion of the magnetic core, the magnetic core can be firmly bonded together with the case and the bobbin at the same time. Therefore, the coil device according to the present invention can easily realize an adhesive strength that does not separate components even when vibration is applied, and can be suitably used as a vehicle-mounted coil device.

  Furthermore, since the application part of the adhesive can be easily observed from the outside of the coil device, the adhesion state can be easily observed after the coil device is assembled, and the reliability of the adhesion is improved. In the present invention, the bobbin around which the winding wire is wound is covered with a case, and the middle leg portion of the magnetic core is inserted into the through hole formed in the case and the bobbin. Is also excellent.

Preferably, a flange portion is formed on each end surface of the cylindrical portion in the winding axis direction, and an opening portion of a bobbin through hole is formed on the end surface of each flange portion,
A frame edge that protrudes in the winding axis direction from the end face of the flange is formed around the opening.

  When the case is assembled to the bobbin, the frame edge formed on the bobbin fits into the opening of the case through-hole formed in the case, and the case through-hole and the bobbin through-hole are positioned concentrically. Can be combined. In this state, when an adhesive is applied along the upper surface of the base portion that is integrally formed with the middle leg portion of the magnetic core, the case, bobbin, and magnetic core are simultaneously and more strongly strengthened by the adhesive. Can be glued.

Preferably, terminal blocks are integrally formed on both ends of the cylindrical portion in the winding axis direction,
The case further includes a flat cover portion that covers at least the upper surface of the terminal block and is formed integrally with the convex cover portion,
The width of the lower edge of the frame edge in contact with the upper surface of the terminal block substantially matches the thickness of the flat cover part,
An escape groove into which the lower edge of the frame edge is inserted is formed at the lower end of the opening of the case through-hole formed in the convex cover.

  In this case, when attaching the case to the bobbin, the frame edge portion of the bobbin is inserted through the escape groove, and the protruding top surface of the frame edge portion can be easily aligned with the winding shaft end surface of the case. In addition, by making the width of the lower edge of the frame edge in contact with the upper surface of the terminal block approximately equal to the thickness of the flat cover portion, the upper surface of the flat cover portion and the bottom surface of the bobbin through hole are substantially flush with each other. It becomes easy to align with. Therefore, it becomes easy to insert the middle leg portion of the magnetic core into the bobbin through hole, and after insertion, the magnetic core can be prevented from rattling between the upper surface of the flat cover portion and the bottom surface of the bobbin through hole. .

  Preferably, a stopper convex portion for preventing the magnetic core from moving outward in the winding axis direction in a state where the middle leg portion of the magnetic core is inserted into the bobbin through hole through the case through hole, The flat cover portion is integrally formed on both upper surfaces in the winding axis direction. This stopper convex portion prevents the magnetic core from moving in the winding axis direction, and the magnetic core and the case are joined more firmly. The stopper convex portion increases the creepage distance between the terminal and the core. There is also a function to earn, and the insulation between them can be further improved.

A plurality of terminals are mounted on the end surface in the winding axis direction of the terminal block,
A skirt portion that covers the side surface of the terminal block excluding the end surface in the winding axis direction may be integrally formed on a side portion of the flat cover portion.

Preferably, bonding is performed along the upper surface of the base portion integrally formed with the middle leg portion of the magnetic core in a state where the middle leg portion of the magnetic core is inserted into the bobbin through hole through the case through hole. Agent is applied,
The adhesive contacts the end surface in the winding axis direction of the case and also contacts the upper portion of the frame edge.

  In this case, the case, the bobbin, and the magnetic core can be more strongly bonded simultaneously with the adhesive.

Preferably, at least a pair of partition walls separating the primary side coil and the secondary side coil formed by the winding wire are formed on the outer periphery of the cylindrical portion so as to protrude in the radial direction at a predetermined interval in the winding axis direction. And
An inward convex plate portion protruding from the inside of the case is positioned and engageable in a gap formed between the pair of partition walls.

  In this case, the positioning when attaching the case to the bobbin is easy, and the relative movement in the winding axis direction between the case and the bobbin is limited after the attachment. It can be firmly joined.

FIG. 1 is an overall perspective view of a transformer according to an embodiment of the present invention. 2A is a perspective view of a bobbin arranged inside the case shown in FIG. 2B is a cross-sectional view of the main part along the line IIB-IIB of the bobbin shown in FIG. 2B, and illustration of the wire for winding is omitted. FIG. 3 is a perspective view of the case shown in FIG. 1 viewed from a different angle. 4 is an exploded perspective view of the transformer showing a state before the magnetic core shown in FIG. 1 is attached.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
As shown in FIG. 1, a transformer 10 as a coil device according to an embodiment of the present invention includes a bobbin 20 and a case 60. As shown in FIGS. 2A and 2B, the bobbin 20 has a bobbin cylindrical portion 22 in which a bobbin through hole 21 is formed along the X-axis direction. Note that the X axis coincides with the winding axis of coil portions 56 and 58 described later.

  At both ends in the X-axis direction of the bobbin cylindrical portion 22, flange portions 38 projecting radially outward from the cylindrical portion 22 are integrally formed. The flange portion 38 has an outer end surface 38a parallel to a plane including the Y axis and the Z axis. Note that the Y axis and the Z axis are perpendicular to each other and perpendicular to the X axis. In the present embodiment, the Z axis coincides with the height direction of the transformer 10, and the Y axis coincides with the width direction of the transformer 2.

  A terminal block 24 is integrally formed at the lower end in the Z-axis direction of each flange 38. Each terminal block 24 has an upper surface 24a perpendicular to the Z axis, an outer end surface 24b perpendicular to the X axis, a side surface 24c perpendicular to the Y axis, and a lower surface 24d perpendicular to the Z axis. Each terminal block 24 is integrated with a plurality of terminals 30 and 32 at predetermined intervals along the Y-axis direction by insert molding or the like. Each of the terminals 30 and 32 protrudes outward from the outer end surface 24b of the terminal block 24 along the X-axis direction.

  In the terminal block 24, lead recesses 34 are formed between the terminals 30 and 32 mounted at predetermined intervals along the Y-axis direction. The lead portions of winding wires 56a and 58a constituting coil portions 56 and 58, which will be described later, are passed through the lead recesses 34 and can be connected to the terminals 30 and 32, respectively. Terminals 30 and 32 are made of metal such as phosphor bronze, tough pitch steel, CP wire, or aluminum.

  As shown in FIG. 2B, at least a pair of partition walls 40 and 42 protrude radially in the X axis direction (winding axis direction) at a predetermined interval on the outer periphery of the bobbin cylinder portion 22 positioned between the pair of flange portions 38. Are integrally molded. The partition walls 40 and 42 have a flat plate shape similar to the flange portion 38, and the height in the Z-axis direction and the width in the Y-axis direction are the same as those of the flange portion 38, but unlike the flange portion 38, the Z-axis direction. Is not directly connected to the terminal block 24. The lower end portions of the partition walls 40 and 42 in the Z-axis direction protrude to the same Z-axis direction position as the lower surface 24 d of the terminal block 24.

  An insulating gap 44 for insulating and separating the primary side coil and the secondary side coil formed by the winding wire is formed on the outer periphery of the cylindrical portion 22 located between the partition walls 40 and 42 in the X-axis direction. is there. A first coil forming groove 46 is formed between the flange portion 38 and the partition wall 40 along the X axis direction, and between the flange portion 38 and the partition wall 42 along the X axis direction. A second coil forming groove 48 is formed.

  A single or a plurality of first winding wires 56 a are wound around the first coil forming groove 46 to form a first coil portion 56, and a single or a plurality of first coil forming grooves 48 are formed in the second coil forming groove 48. The second coil wire 58 is formed by winding the second winding wire 58a. In the present embodiment, the first coil portion 56 is a primary coil and the second coil portion 58 is a secondary coil, but the reverse may be possible.

  In the present embodiment, the bobbin opening 23 of the bobbin through-hole 21 is formed on the end surface 38a of each flange 38, and the bobbin opening 23 is surrounded by the X-axis direction from the end surface 38a of the flange 38. A protruding frame edge 50 is formed. A tapered portion 52 may be formed inside the frame edge portion 50. The taper portion 52 may be a convex curved surface, and guides the tip of a middle leg portion 94 of a magnetic core 90 described later to the bobbin through hole 21.

  In the present embodiment, the frame edge portion 50 is continuously formed over the entire circumference of the bobbin opening portion 23, but is not necessarily formed over the entire circumference, for example, only the upper edge portion of the bobbin opening portion 23, or You may form only in the both ends of the Y-axis direction of the bobbin opening part 23. FIG. Moreover, you may form the frame edge part 50 intermittently along the circumferential direction. The protrusion height h1 of the frame edge 50 and the width of the frame edge 50 (including the width h2 of the lower edge 50a of the frame edge 50) will be described later.

  As shown in FIGS. 1 and 3, the case 60 has a convex cover portion 62 that is mounted so as to cover at least the bobbin cylinder portion 22 from above. The convex cover portion 62 is integrally formed at the center portion of the flat cover portion 64 parallel to the XY axis plane so as to protrude upward in the Z-axis direction. Skirt portions 68 projecting downward in the Z-axis direction are integrally formed at both ends in the Y-axis direction of the flat cover portion 64.

  The convex cover portion 62 shown in FIG. 3 has a shape that covers the bobbin cylindrical portion 22 of the bobbin 20 shown in FIGS. 2A and 2B from above in the Z-axis direction. The upper surface 24a is covered from above in the Z-axis direction. The skirt portion 68 has a shape that covers the side surface 24c of the terminal block 24 except for the end surface 24b in the X-axis direction. Moreover, in the present embodiment, the skirt portion 68 and the flat cover portion 64 are also continuous in the X-axis direction.

  As shown in FIG. 3, the inward convex plate portion is connected to the inside of the case 60 so as to connect the inside of the convex cover portion 62, the flat cover portion 64, and the skirt portion 68 at an intermediate position in the X-axis direction. 72 is integrally formed. The inward convex plate portion 72 is formed in parallel with the Y-Z axis plane, and a notch portion 74 whose lower end in the Z axis direction is open is formed at the center portion of the inward convex plate portion 72 in the Y axis direction. It is formed.

  The width w1 in the Y-axis direction of the notch 74 has a width equal to or greater than the width in the Y-axis direction of the bobbin cylinder portion 22 shown in FIG. 2B, and the inward convex plate portion 72 shown in FIG. It can be positioned and engaged with the gap 44 for use at least on both sides in the Y-axis direction. When the inward convex plate portion 72 shown in FIG. 3 is also formed inside the top surface of the convex cover portion 62 in the Z-axis direction, the inward convex plate portion 72 shown in FIG. It is possible to engage with the gap 44 for insulation shown in 2B by positioning from three directions on the upper side in the Z-axis direction and on both sides in the Y-axis direction.

  As shown in FIG. 2B, in this embodiment, since the X-axis direction width of the first coil forming groove 46 and the X-axis direction width of the second coil forming groove 48 are different, the insulating groove 44 is The bobbin cylinder portion 22 is not formed at the exact center in the X-axis direction, but is slightly deviated. For this reason, the inward convex plate portion 72 shown in FIG. 3 is not formed at the exact center of the convex cover portion 62 in the X-axis direction but is slightly shifted from the center in accordance with the groove 44. For this reason, when attaching the case 60 to the bobbin 20, it is possible to prevent the case 60 from being attached in the reverse direction in the X-axis direction. Therefore, by marking the outer surface of the case 60, it is easy to distinguish the primary side terminal and the secondary side terminal from the outer surface of the case 60, and effectively prevent the primary side terminal and the secondary side terminal from being mixed. be able to.

  Further, since the inward convex plate portion 72 is engaged with the groove 44, alignment when the case 60 is attached to the bobbin 20 is easy, and the relative movement in the X-axis direction between the case 60 and the bobbin 20 after attachment. Is limited, and the case 60 and the bobbin 20 can be joined more firmly without rattling. Further, the engagement of the inward convex plate portion 72 with the groove 44 increases the creeping distance between the primary side coil and the secondary side coil, and further improves the insulation. Further, the inward convex plate portion 72 is engaged with the groove 44, thereby reinforcing the case 60 and preventing the case 60 from being deformed.

  The case 60 and the bobbin 20 are each made of an insulating member such as a synthetic resin, but may be made of another insulating material such as ceramic depending on the application. Since the terminals 30 and 32 are integrally molded, the bobbin 20 is preferably made of a synthetic resin capable of insert injection molding, such as PBT, PET, LCP, PPS, nylon, PS, diallyl phthalate (DAP), Consists of synthetic resins such as phenol. The case 60 may be made of the same synthetic resin as that of the bobbin 20, but it may be made of synthetic resin such as PET, PS, or nylon because there is no need to insert-mold the terminals.

  In the present embodiment, as shown in FIGS. 1 and 4, the middle legs 94 of the pair of magnetic cores 90 are inserted into the bobbin through hole 21 through the case through hole 61 in a state where the case 60 is attached to the bobbin 20. , And are inserted from the outside in the X-axis direction.

  The pair of magnetic cores 90 includes a base portion 92 that extends in the Y-axis direction, a middle leg portion 94 that is integrally formed by projecting in the X-axis direction at the center portion of the base portion 92 in the Y-axis direction, and a Y-axis of the base portion. Side legs 96 that project in the X-axis direction from both ends in the direction and are integrally formed. Each core 90 is not particularly limited, and is made of, for example, a soft magnetic material such as a ferrite material or permalloy, or a magnetic material formed by metal compaction.

  In this embodiment, as shown in FIGS. 1 and 4, the middle leg portions 94 of the pair of magnetic cores 90 are inserted from the outside in the X-axis direction into the bobbin through hole 21 through the case through hole 61, respectively. Inside the through hole 21, the tips of the middle leg portions 94 come into contact with each other. Or inside the bobbin through-hole 21, the front-end | tip of each middle leg 94 may be opposed by the predetermined gap, without contacting. By adjusting the length of the gap, characteristics such as inductance can be adjusted.

  In a state where the middle leg portion 94 of the magnetic core 90 is inserted into the bobbin through hole 21 through the case through hole 61, each side leg portion 96 is located on the upper surface of the flat cover portion 64 of the case 60 and is a convex cover. The front ends of the side legs 96 are brought into contact with each other so as to cover both side surfaces in the Y-axis direction.

  A stopper convex portion 80 that prevents the magnetic core 90 from moving outward in the winding axis direction in a state where the middle leg portion 94 of the magnetic core 90 is inserted into the bobbin through hole 21 through the case through hole 61 is a flat plate. The cover portion 64 is integrally formed on the upper surfaces of both ends in the X-axis direction. The stopper convex portion 80 prevents the magnetic core 90 from moving in the X-axis direction, and the magnetic core 90 and the case 60 are more firmly joined. The stopper convex portion 80 is connected to the terminals 30 and 32. There is also a function of increasing a creepage distance between the core 90, and the insulation between them can be further improved.

  The height h3 (see FIG. 3) in the Z-axis direction of the stopper projection 80 from the upper surface of the flat cover portion 64 is shown in FIG. 4 from the height h4 in the Z-axis direction of the bobbin through-hole 21 shown in FIG. It is preferable that it is equal to or smaller than the value (h4-h5) obtained by subtracting the height h5 of the magnetic core 90 in the Z-axis direction. This is because the convex portion 80 does not get in the way when the middle leg portion 94 of the core 90 is inserted into the through hole 21 of the bobbin 20 from the X-axis direction.

  The subtracted value (h4-h5) corresponds to the size of the gap between the upper surface of the core 90 and the upper end of the bobbin through-hole 21, as shown in FIG. 100 will enter. The subtracted value (h4-h5) is preferably 0.5 to 2.0 mm. By setting to such a range, the adhesive 100 can easily enter the bobbin through-hole 21 without increasing the height of the transformer 10 in the Z-axis direction. The adhesive strength between the core 60 and the core 90 can be improved.

  In the present invention, the opening width w2 (see FIG. 3) at the opening 63 of the case through-hole 61 formed in the case 60 is larger than the opening width w3 (see FIG. 2A) of the opening 23 of the bobbin through-hole 21. . Alternatively, the opening height h6 (see FIG. 4) in the opening 63 of the case through hole 61 formed in the case 60 is larger than the opening height h4 (see FIG. 2B) of the opening 23 of the bobbin through hole 21. . In the illustrated embodiment, both of these conditions are satisfied. However, in the present invention, any one of the conditions may be satisfied.

  Moreover, in the present embodiment, the frame edge formed in the bobbin 20 so that the bobbin through hole 21 and the case through hole 61 are aligned concentrically in a state where the bobbin 20 and the case 60 are combined. The part 50 is adapted to fit into the opening 63 of the case 60. The width w4 (see FIG. 2B) of the frame edge portion 50 is preferably 0.2 to 1.0 mm at the upper and side portions of the frame edge portion 50, and may be smaller than the thickness of the cylindrical portion 22.

  In this embodiment, the width h2 of the lower edge 50a of the frame edge 50 that contacts the upper surface 24a of the terminal block 24 shown in FIG. 2B is equal to the width w4 of the frame edge 50 at the upper and side portions of the frame edge 50. It may be equal or larger. The width h2 of the lower end edge portion 50a of the frame edge portion 50 substantially matches the thickness t2 of the flat cover portion 64 shown in FIG.

  Further, as shown in FIG. 3, the lower end edge 50a of the frame edge 50 shown in FIG. 2A is formed at the lower end in the Z-axis direction of the opening 63 of the case through hole 61 formed in the convex cover portion 62. An escape groove 70 (see FIG. 3) to be inserted is formed. The width of the escape groove 70 in the Y-axis direction matches the width W2 of the opening 63, and the width w5 of the escape groove 70 in the X-axis direction is substantially equal to the protrusion height h1 of the frame edge 50 shown in FIG. More than that.

  With this configuration, when the case 60 is attached to the bobbin, the frame edge 50 of the bobbin 20 is inserted through the escape groove 70, and the protruding top surface of the frame edge 50 is substantially the X-axis end surface of the case 60. Easy to align. Further, by making the width h2 of the lower edge 50a of the frame edge 50 in contact with the upper surface of the terminal block 24 substantially coincide with the thickness t2 of the flat cover portion 64, the upper surface 24a of the terminal block 24 and the bobbin through hole 21 are provided. It becomes easy to align the bottom surface of the surface substantially flush. Therefore, it becomes easy to insert the middle leg portion 94 of the magnetic core 90 into the bobbin through-hole 21, and after insertion, the magnetic core 90 rattles between the upper surface of the flat cover portion 64 and the bottom surface of the bobbin through-hole 21. Can be prevented.

  The protrusion height h1 of the frame edge portion 50 from the end face 38a shown in FIG. 2A is preferably 0.5 to 4.0 times the thickness t1 of the convex cover portion 62 in the case 60 shown in FIG. It is preferably about 0.8 to 1.1 times. With this relationship, the protruding top surface of the frame edge portion 50 can be substantially flush with the outer surface of the case 0 in a state where the case 60 is attached to the bobbin 20. Note that “substantially flush” means that the projecting top surface of the frame edge portion 50 may be slightly retracted or slightly protruded from the outer surface of the case 60.

  In the present embodiment, as shown in FIG. 1, along the upper surface of the base portion 92 of the magnetic core 90 in a state where the middle leg portion 94 of the magnetic core 90 is inserted into the bobbin through hole 21 through the case through hole 61. The adhesive 100 is applied along the Y-axis direction. The adhesive 100 comes into contact with the end surface in the X-axis direction of the convex cover portion 62 in the case 60, and a part of the adhesive 100 enters the bobbin through hole 21 through the opening 63 of the case through hole 61, so Also contact.

  As the adhesive 100, for example, an epoxy adhesive or a silicone adhesive is preferably used, but a silicone adhesive is preferable from the viewpoint of improving the thermal shock resistance.

  In the transformer 10 according to the present embodiment, the opening width w2 (or opening height h6) of the case through-hole 61 is larger than the opening width w3 (or opening height h4) of the bobbin through-hole 21. Therefore, when the adhesive 100 is applied along the upper surface of the magnetic core 90 base portion 92 in a state where the middle leg portion 94 of the magnetic core 90 is inserted into the bobbin through hole 21 through the case through hole 61, With the adhesive 100, the case 60, the bobbin 20, and the magnetic core 90 can be bonded simultaneously.

  Therefore, the transformer 10 of this embodiment is excellent in adhesion workability. Further, the opening width w2 (or opening height h6) in the opening 63 of the case through hole 61 is larger than the opening width w3 (or opening height h4) of the bobbin through hole 21. For this reason, the case 60 and the bobbin 20 can be firmly bonded by applying the adhesive 100 to portions having different sizes on the upper surface of the core 90. In addition, since the adhesive 100 is applied to the upper surface of the base portion 92 of the magnetic core 90, the magnetic core 90 can be firmly bonded together with the case 60 and the bobbin 20 at the same time. For this reason, the transformer 10 according to the present embodiment does not separate components even when vibration is applied, and has excellent vibration resistance (break prevention and chipping prevention), and can be suitably used as an on-vehicle transformer.

  Furthermore, since the application part of the adhesive 100 can be easily observed from the outside of the transformer 10, the bonding state can be easily observed after the transformer 10 is assembled, and the reliability of bonding is improved. . In the present embodiment, the bobbin 20 to which the coil portions 56 and 58 are attached is covered with the case 60, and the middle leg portion 94 of the magnetic core 90 is placed in the through holes 61 and 21 formed in the case 60 and the bobbin 20. Since it is inserted, it has excellent insulation.

  In this embodiment, when the case 60 is assembled to the bobbin 20, the frame edge portion 50 formed on the bobbin 20 is fitted into the opening 63 of the case through hole 61 formed on the case 60. The through hole 61 and the bobbin through hole 21 can be aligned concentrically. In this state, by applying the adhesive 100 along the upper surface of the base portion 92 of the magnetic core 90, the case 60, the bobbin 20, and the magnetic core 90 are simultaneously and more strongly bonded by the adhesive 100. be able to.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention.

  For example, in the embodiment described above, the heights of the cores 90 in the Z-axis direction are all the same, but they are not necessarily the same and may be different. For example, the height of the middle leg portion 94 in the Z-axis direction may be different from that of the base portion 92 and the side leg portion 96. In such a case, the height h5 of the magnetic core 90 in the Z-axis direction corresponds to the height of the middle leg 94 in the Z-axis direction and is equal to or less than the height h4 of the bobbin through-hole 21 in the Z-axis direction. To be determined.

  In the above-described embodiment, the cross-sectional shape of the bobbin through-hole 21 is a rectangle, but is not limited to a rectangle, and may be a circle, an ellipse, a polygon, or other shapes. In addition, according to the cross-sectional shape of the bobbin through-hole 21, the cross-sectional shape of the middle leg portion 94 of the magnetic core 90 has the same shape, and the shape of the opening 63 of the case through-hole 61 changes.

10 ... Transformer (coil device)
20 ... Bobbin 21 ... Bobbin through-hole 22 ... Tube part 23 ... Bobbin opening 24 ... Terminal block 24a ... Upper face 24b ... End face 24c ... Side face 24d ... Lower face 30, 32 ... Terminal 34 ... Recessed recess 38 ... Gutter 40, 42 ... partition wall 44 ... insulating gaps 46, 48 ... coil forming groove 50 ... edge frame part 50a ... lower end edge part 52 ... guide taper surface 56 ... first coil part 56a ... first winding wire 58 ... second coil Part 58a ... Second winding wire 60 ... Case 61 ... Case through hole 62 ... Convex cover part 63 ... Case opening 64 ... Flat cover part 68 ... Skirt part 70 ... Escape groove 72 ... Inward convex plate part 74 ... notch part 80 ... convex part 90 for stopper ... magnetic core 92 ... base part 94 ... middle leg part 96 ... side leg part 100 ... adhesive

Claims (7)

A bobbin having a cylindrical portion in which a bobbin through hole is formed inside and a winding wire is wound around the outer periphery;
A case having a convex cover part that is mounted so as to cover at least the cylinder part from above and in which a case through hole communicating with the bobbin through hole is formed;
A coil device having a magnetic core having at least a middle leg portion,
In a state where the case is attached to the bobbin, a middle leg portion of the magnetic core is inserted into the bobbin through hole through the case through hole,
An opening width or opening height of the case through hole is larger than an opening width or opening height of the bobbin through hole, respectively. A flange portion is formed on each end surface in the winding axis direction of the cylindrical portion, and an opening portion of the bobbin through hole is formed on an end surface of each flange portion,
The coil device according to claim 1, wherein a frame edge portion is formed around the opening portion so as to protrude in the winding axis direction from an end surface of the flange portion. Terminal blocks are integrally formed on both ends of the cylindrical portion in the winding axis direction,
The case further includes a flat cover portion that covers at least the upper surface of the terminal block and is formed integrally with the convex cover portion,
The width of the lower edge of the frame edge in contact with the upper surface of the terminal block substantially matches the thickness of the flat cover part,
3. The coil device according to claim 2, wherein an escape groove into which the lower edge of the frame edge is inserted is formed at the lower end of the opening of the case through-hole formed in the convex cover.   In the state where the middle leg portion of the magnetic core is inserted into the bobbin through hole through the case through hole, the stopper convex portion that prevents the magnetic core from moving outward in the winding axis direction is formed in the flat plate shape. The coil device according to claim 3, wherein the coil device is integrally formed on both upper surfaces of the cover portion in the winding axis direction. A plurality of terminals are mounted on the end surface in the winding axis direction of the terminal block,
The coil device according to claim 3 or 4, wherein a skirt portion that covers a side surface of the terminal block excluding the end surface in the winding axis direction is integrally formed on a side portion of the flat cover portion. An adhesive is applied along the upper surface of the base part integrally formed with the middle leg part of the magnetic core in a state where the middle leg part of the magnetic core is inserted into the bobbin through hole through the case through hole. And
The coil device according to any one of claims 1 to 5, wherein the adhesive contacts the end surface in the winding axis direction of the case and also contacts an upper portion of the frame edge portion. At least a pair of partition walls separating the primary side coil and the secondary side coil formed by the winding wire are formed on the outer periphery of the cylindrical portion so as to protrude in the radial direction at predetermined intervals in the winding axis direction. ,
The inward convex plate portion formed so as to protrude inside the case is positioned and engageable in a gap formed between the pair of partition walls. The coil apparatus as described.

Images