Coil device

Abstract

To provide a highly reliable coil device that is easy to assemble even when the coil device has a plurality of cores.SOLUTION: A coil device 1 includes: a main bobbin 40, an auxiliary bobbin 60 arranged at one first end along an axis core of the main bobbin; and a first core 10 disposed between a first end of the main bobbin and the first end of the auxiliary bobbin. A single continuous wire 90 is wound around the main bobbin 40 and the auxiliary bobbin 60. Connecting portions 43, 63 including a portion through which a middle portion 93 of the wire passes are arranged partly in a circumferential direction of the first end of the main bobbin. With the wire continuously wound around the main bobbin 40 and the auxiliary bobbin 60, the auxiliary bobbin 60 rotates with respect to the main bobbin 40 with the middle portion 93 of the wire or a part of the connecting portions 43, 63 as a pivot point, opens an insertion hole of the main bobbin 40, and is configured such that a leg portion 11 of the first core can be inserted into the insertion hole.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a coil device capable of arranging a plurality of cores along an axis.

Background Art

[0002] The following Patent Document 1 discloses a wound coil device in which three cores are arranged along an axis.

[0003] However, in the coil device shown in Patent Document 1, the bobbin for winding the wire and arranging three cores in series is completely divided into at least two. Therefore, after winding a separate wire for each bobbin, the core corresponding to each bobbin is attached, and then the bobbin and the core are combined, and the ends of the wires wound around each bobbin need to be connected outside the core. In addition, the ends of the wires wound around each bobbin have a bobbin structure that cannot be connected unless the core is attached, so the assembly of the coil device is not easy and the reliability is also reduced.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of such a situation, the present invention is made, and an object thereof is to provide a coil device having a plurality of cores, which is easy to assemble and has excellent reliability.

Means for Solving the Problems

[0006] To achieve the above object, the coil device according to the present invention is a main bobbin, An auxiliary bobbin disposed at one first end along the axis of the main bobbin, A coil device having a first core disposed between the first end of the main bobbin and the first end of the auxiliary bobbin, A single continuous wire is wound around the main winding core portion of the main bobbin and the auxiliary winding core portion of the auxiliary bobbin, A connecting portion including a portion through which the middle portion of the wire passes is formed between the main bobbin and the auxiliary bobbin, The connecting portion is disposed at a part in the circumferential direction of the first end of the main bobbin, With the wire continuously wound around the main winding core portion and the auxiliary winding core portion, with the middle portion of the wire or a part of the connecting portion as a rotation fulcrum, the auxiliary bobbin rotates with respect to the main bobbin, opening the insertion hole of the main winding core portion, and the leg portion of the first core is configured to be insertable into the insertion hole.

[0007] In the coil device of the present invention, a connecting portion including a portion through which the middle portion of the wire passes is formed between the main bobbin and the auxiliary bobbin, and the connecting portion is disposed at a part in the circumferential direction of the first end of the main bobbin. Therefore, in the coil device of the present invention, with the middle portion of the wire or a part of the connecting portion as a rotation fulcrum, the auxiliary bobbin rotates with respect to the main bobbin, opening the insertion hole of the main winding core portion, and the leg portion of the first core can be inserted into the insertion hole. As a result, after continuously winding a single wire around the main bobbin and the auxiliary bobbin, the auxiliary bobbin can be rotated with respect to the main bobbin to open the insertion hole of the main winding core portion, and the leg portion of the first core can be inserted into the insertion hole.

[0008] After inserting the leg portion of the first core into the insertion hole, the auxiliary bobbin is rotated in the reverse direction with respect to the main bobbin, and the base portion of the first core can be sandwiched between the first end of the main bobbin and the first end of the auxiliary bobbin. Thereafter, a second core can be attached to the second end located on the side opposite to the first end of the main bobbin, and before, after, or simultaneously, a third core can be attached to the second end on the side opposite to the first end of the auxiliary bobbin. The plurality of cores including the first core, the second core, and the third core can be arranged to form a magnetic circuit along the axis.

[0009] Thus, in the coil device of the present invention, even in the case of a coil device having a plurality of cores, after the cores are attached, it is not necessary to connect the ends of the wire to each other, the assembly of the coil device becomes extremely easy, and the reliability of the coil device is improved.

[0010] Preferably, the connecting portion is formed as a main bobbin connecting portion formed in a part in the circumferential direction of a first main bobbin flange provided at the first end of the main bobbin, and is formed as an auxiliary bobbin connecting portion formed in a part in the circumferential direction of a first auxiliary bobbin flange provided at the first end of the auxiliary bobbin. The main bobbin connecting portion and the auxiliary bobbin connecting portion may be configured to be separable, or may be integrally connected by integral molding so as to be relatively rotatable via a thin portion serving as a rotation fulcrum.

[0011] Preferably, the main bobbin connecting portion and the auxiliary bobbin connecting portion are each formed with a communication groove through which an intermediate portion of the wire passes at corresponding positions. By passing the intermediate portion of the wire through the communication groove, it becomes possible to continuously wind the wire around the main winding core portion and the auxiliary winding core portion using a single wire.

[0012] The connecting portion may have a combination of a rotatable rotation fulcrum pin that can be attached and detached and a fulcrum receiving portion. When the main bobbin connecting portion and the auxiliary bobbin connecting portion are configured to be separable, for example, either one of the rotation fulcrum pin or the fulcrum receiving portion can be provided in the main bobbin connecting portion, and the other can be provided in the auxiliary bobbin connecting portion. By configuring in this way, with the rotation fulcrum pin as a fulcrum, the auxiliary bobbin can be rotated with respect to the main bobbin to open the insertion hole of the main winding core portion, and the leg portion of the first core can be inserted into the insertion hole.

[0013] The connecting part may be constituted by the middle part of the wire itself, and preferably, it is arranged at a part in the circumferential direction of the first end of the main bobbin. That is, the middle part of the wire itself becomes the connecting part, and the middle part of the wire itself may rotatably connect the main bobbin and the auxiliary bobbin. In that case, the middle part of the wire itself becomes the rotation fulcrum.

[0014] However, when the main bobbin and the auxiliary bobbin are rotatably connected by the middle part of the wire itself, it is preferable to use a jig for temporarily fixing the auxiliary bobbin to the main bobbin during the wire winding operation. Alternatively, it is preferable that the main bobbin and / or the auxiliary bobbin have a fitting part for temporarily fixing the main bobbin and the auxiliary bobbin.

[0015] For example, the connecting part may have a combination of a fulcrum-side fitting convex part and a fulcrum-side fitting concave part that can be detachably fitted. Alternatively, along a vertical axis perpendicular to the axis of the main bobbin, between the main bobbin and the auxiliary bobbin located on the side opposite to the connecting part, there may be a combination of a counter-fulcrum-side fitting convex part and a counter-fulcrum-side fitting concave part that can be detachably fitted.

[0016] The coil device may further have a sub-auxiliary bobbin arranged at the other second end along the axis of the main bobbin. Another continuous single different wire different from the wire may be wound around the main winding core part of the main bobbin and the auxiliary winding core part of the sub-auxiliary bobbin. Also, between the main bobbin and the sub-auxiliary bobbin, a separate connecting part including a part through which the middle part of the separate wire passes may be formed.

[0017] Preferably, the separate connecting part is arranged at a part in the circumferential direction of the second end of the main bobbin. Also, preferably, with the separate wire continuously wound around the main winding core part and the sub-auxiliary winding core part, the sub-auxiliary bobbin rotates with respect to the main bobbin using the middle part of the separate wire or a part of the separate connecting part as a rotation fulcrum. By configuring in this way, the insertion hole of the main winding core part can be opened, and the leg part of the second core different from the first core can be inserted into the insertion hole.

[0018] The separate connection part between the main bobbin and the sub - auxiliary bobbin can adopt the same configuration as the connection part between the main bobbin and the auxiliary bobbin described above, and has the same working effects.

[0019] For example, after inserting the leg part of the second core into the insertion hole, rotate the sub - auxiliary bobbin in the closing direction opposite to the opening direction with respect to the main bobbin, so that the base part of the second core can be sandwiched between the second end of the main bobbin and the second end of the sub - auxiliary bobbin. Before, after, or at the same time as that, as described above, the first core can be attached between the main bobbin and the auxiliary bobbin. Also, afterwards, a third core can be attached to the second end of the auxiliary bobbin opposite to the first end, and before and after that, a fourth core can be attached to the outer end of the sub - auxiliary bobbin. The plurality of cores composed of the first core, the second core, the third core, and the fourth core can be arranged to form a magnetic circuit along the axis.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4A

Figure 4B

Figure 5

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 9

DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

[0022] First Embodiment As shown in FIG. 1, the coil device 1 of the present invention is used, for example, as an in-vehicle on-board charging transformer, a charging station transformer, an ESS (Energy Storage System), or the like. As shown in FIG. 2, this coil device 1 includes a main bobbin 40, an auxiliary bobbin 60, a first core 10, a second core 20, a third core 30, a first wire 80, and a second wire 90. The first wire 80 and the second wire 90 are wound around the main bobbin 40, and the second wire 90 is wound around the auxiliary bobbin 60. In the drawings, the X-axis, the Y-axis, and the Z-axis are orthogonal to each other. In the present embodiment, the directions away from the center of the coil device 1 with respect to the X-axis, the Y-axis, and the Z-axis may be referred to as the outer side, and the directions approaching the center may be referred to as the inner side.

[0023] As shown in FIG. 1, the main bobbin 40 and the auxiliary bobbin 60 are arranged side by side along the X-axis, and the first core 10 is arranged between one end of the main bobbin 40 along the X-axis and one end of the auxiliary bobbin 60 along the X-axis. The second core 20 is arranged at the other end of the main bobbin 40 along the X-axis. The third core 30 is arranged at the other end of the auxiliary bobbin 60 along the X-axis.

[0024] As shown in FIG. 2, in the present embodiment, the first core 10 has a shape symmetric along the Z-axis and the Y-axis. The first core 10 has a first base portion 13. The first base portion 13 has first outer leg portions 12, 12 protruding along the X-axis on both sides along the Y-axis. Further, the first base portion 13 has a first insertion leg portion (middle leg portion) 11 protruding along the X-axis substantially in the middle of the first outer leg portions 12, 12. That is, the first core 10 is a so-called E-shaped core. Note that the first core 10 is not limited to an E-shaped core, and may be a U-shaped core, or two U-shaped cores may be connected by a two-dot chain line shown in FIG. 2.

[0025] As shown in FIG. 2, the first base portion 13 has a predetermined thickness in the X-axis direction and has a plane parallel to the Y-Z plane. The first base portion 13 has inclined surfaces extending from the ends where the first outer leg portions 12, 12 are connected upward and downward along the Z-axis toward the center of the Y-axis of the first base portion 13.

[0026] As shown in FIG. 2, the outer surfaces of the first outer leg portions 12, 12 along the Y-axis are flat. On the other hand, the inner surfaces of the first outer leg portions 12, 12 along the Y-axis are curved surfaces. Further, the end surfaces of the first outer leg portions 12, 12 in the Z-axis direction are planes perpendicular to the Z-axis. Note that the shape of the inner surfaces of the first outer leg portions 12, 12 is not limited, but is preferably a shape corresponding to the outer shape of the surface perpendicular to the X-axis of the first main bobbin flange 42 of the main bobbin 40.

[0027] As shown in FIG. 2, the first insertion leg portion 11 has an outer periphery parallel to the X-axis. The cross-section of the first insertion leg portion 11 perpendicular to the X-axis is substantially a rounded rectangular shape and has a shape corresponding to the shape of the main bobbin insertion hole 51 of the main bobbin 40.

[0028] As shown in FIG. 5, the end face of the first insertion leg portion 11 in the X-axis direction is formed to be flush with the end faces of the first outer leg portions 12, 12 in the X-axis direction. Note that the position of the end face of the first insertion leg portion 11 in the X-axis direction is not limited to this. For example, the end face of the first insertion leg portion 11 in the X-axis direction may be formed closer to the first base portion 13 than the positions of the end faces of the first outer leg portions 12, 12 in the X-axis direction, and a step may be formed between the end face of the first insertion leg portion 11 in the X-axis direction and the end faces of the first outer leg portions 12, 12 in the X-axis direction.

[0029] As shown in FIG. 2, in the present embodiment, the second core 20 has a symmetrical shape along the Z-axis and the Y-axis. The second core 20 has a second base portion 23. The second base portion 23 has second outer leg portions 22, 22 that protrude along the X-axis on both sides along the Y-axis. Further, the second base portion 23 has a second insertion leg portion (middle leg portion) 21 that protrudes along the X-axis substantially in the middle of the second outer leg portions 22, 22. That is, the second core 20 is a so-called E-shaped core. Note that the second core 20 is not limited to an E-shaped core, and may be a U-shaped core, or two U-shaped cores may be connected by a two-dot chain line shown in FIG. 2.

[0030] As shown in FIG. 2, the second base portion 23 has a predetermined thickness in the X-axis direction and has a plane parallel to the Y-Z plane. The second base portion 23 has inclined surfaces that extend from the ends where the second outer leg portions 22, 22 are connected upward and downward along the Z-axis toward the center of the Y-axis of the second base portion 23.

[0031] As shown in FIG. 2, the outer surfaces of the second outer leg portions 22, 22 along the Y-axis are flat. On the other hand, the inner surfaces of the second outer leg portions 22, 22 along the Y-axis are curved. Further, the end faces of the second outer leg portions 22, 22 in the Z-axis direction are planes perpendicular to the Z-axis. Note that the shape of the inner surfaces of the second outer leg portions 22, 22 is not limited, but is preferably a shape corresponding to the outer shape of the plane perpendicular to the X-axis of the second main bobbin flange 52 of the main bobbin 40.

[0032] As shown in FIG. 2, the second insertion leg portion 21 has an outer periphery parallel to the X-axis. The cross-section of the second insertion leg portion 21 perpendicular to the Z-axis is substantially a rounded rectangular shape, and has a shape corresponding to the shape of the main bobbin insertion hole 51 of the main bobbin 40.

[0033] As shown in FIG. 5, the end surface of the second insertion leg portion 21 in the X-axis direction is formed to be flush with the end surfaces of the second outer leg portions 22, 22 in the X-axis direction. Note that the position of the end surface of the second insertion leg portion 21 in the X-axis direction is not limited to this. For example, the end surface of the second insertion leg portion 21 in the X-axis direction may be formed closer to the second base portion 23 than the positions of the end surfaces of the second outer leg portions 22, 22 in the X-axis direction, and a step may be formed between the end surfaces of the second outer leg portions 22, 22 in the X-axis direction.

[0034] As shown in FIG. 5, the end surface of the second insertion leg portion 21 in the X-axis direction is in contact with the end surface of the first insertion leg portion 11 in the X-axis direction, and the end surfaces of the second outer leg portions 22, 22 in the X-axis direction are in contact with the end surfaces of the first outer leg portions 12, 12 in the X-axis direction, but it is not limited to this. The lengths of the first insertion leg portion 11, the second insertion leg portion 21, the first outer leg portions 12, 12, and the second outer leg portions 22, 22 in the X-axis direction may be adjusted to form a gap at each end surface in the X-axis direction.

[0035] As shown in FIG. 2, in this embodiment, the third core 30 has a shape symmetric along the Z-axis and the Y-axis. The third core 30 has a third base portion 33. The third base portion 33 has third outer leg portions 32, 32 protruding along the X-axis on both sides along the Y-axis. Further, the third base portion 33 has a third insertion leg portion (middle leg portion) 31 protruding along the X-axis substantially in the middle of the third outer leg portions 32, 32. That is, the third core 30 is a so-called E-shaped core. Note that the third core 30 is not limited to an E-shaped core, and may be a U-shaped core, or two U-shaped cores may be joined by a two-dot chain line shown in FIG. 2.

[0036] As shown in FIG. 2, the third base portion 33 has a predetermined thickness in the X-axis direction and has a plane parallel to the Y-Z plane. The third base portion 33 has inclined surfaces extending from the ends where the third outer leg portions 32, 32 are connected upward and downward along the Z-axis toward the center of the Y-axis of the third base portion 33.

[0037] As shown in FIG. 2, the outer surfaces of the third outer leg portions 32, 32 along the Y-axis are flat. On the other hand, the inner surfaces of the third outer leg portions 32, 32 along the Y-axis are curved surfaces. Also, the end faces of the third outer leg portions 32, 32 in the Z-axis direction are planes perpendicular to the Z-axis. Note that the shape of the inner surfaces of the third outer leg portions 32, 32 is not limited, but is preferably a shape corresponding to the outer shape of the plane perpendicular to the X-axis of the first auxiliary bobbin flange 72 of the auxiliary bobbin 60.

[0038] As shown in FIG. 2, the third insertion leg portion 31 has an outer periphery parallel to the X-axis. The cross-section of the third insertion leg portion 31 perpendicular to the X-axis is substantially a rounded rectangular shape and has a shape corresponding to the shape of the auxiliary bobbin insertion hole 71 of the auxiliary bobbin 60.

[0039] As shown in FIG. 5, the end face of the third insertion leg portion 31 in the Z-axis direction is formed to be flush with the end faces of the third outer leg portions 32, 32 in the X-axis direction. Note that the position of the end face of the third insertion leg portion 31 in the X-axis direction is not limited to this. For example, the end face of the third insertion leg portion 31 in the X-axis direction may be formed closer to the third base portion 33 than the positions of the end faces of the third outer leg portions 32, 32 in the X-axis direction, and a step may be formed between them and the end faces of the third outer leg portions 32, 32 in the X-axis direction.

[0040] As shown in FIG. 5, the end faces of the third insertion leg portion 31 in the X-axis direction and the end faces of the second outer leg portions 22, 22 in the X-axis direction are in contact with the first base portion 13, but are not limited to this. The lengths of the third insertion leg portion 31 and the third outer leg portions 32, 32 in the X-axis direction may be adjusted to form gaps at their respective end faces in the X-axis direction.

[0041] As shown in FIG. 6, the main bobbin 40 has a main bobbin body 50 (main winding core part) extending along the X-axis. A main bobbin insertion hole 51 is formed in the main bobbin body 50 along the X-axis. Further, the main bobbin 40 has a first main bobbin flange 42 at one end on the X-axis side of the main bobbin body 50 and a second main bobbin flange 52 at the other end.

[0042] On the upper part of the first main bobbin flange 42 along the Z-axis, a main bobbin connecting part 43 for connecting with the auxiliary bobbin 60 is formed. Below the main bobbin connecting part 43 along the Z-axis, tapered surfaces 43a, 43a inclined toward the center of the Y-axis are formed. The tapered surfaces 43a, 43a are formed so as to contact the upper inclined surface along the Z-axis of the first base part 13 of the first core 10 shown in FIG. 2. Further, the main bobbin connecting part 43 has an R-shaped curved surface from the surface on the auxiliary bobbin 60 side along the X-axis to the upper surface along the Z-axis.

[0043] As shown in FIG. 6, a main bobbin communication groove 45 is formed at substantially the center of the Y-axis of the main bobbin connecting part 43. The upper part of the main bobbin communication groove 45 along the Z-axis is cut away, and the bottom surface of the main bobbin communication groove 45 is substantially flush with the upper surface of the main bobbin body 50 along the Z-axis.

[0044] As shown in FIG. 6, on the end surface of the main bobbin connecting part 43 on the auxiliary bobbin 60 side along the X-axis, a pair of main bobbin side fitting parts 46a, 46b are formed with the main bobbin communication groove 45 sandwiched therebetween along the Y-axis. The main bobbin side fitting parts 46a, 46b are recessed in the X-axis direction.

[0045] As shown in FIG. 6, fulcrum receiving parts 47a, 47b are formed at both ends of the main bobbin connecting part 43 along the Y-axis. The fulcrum receiving parts 47a, 47b project toward the auxiliary bobbin 60 side along the X-axis. The fulcrum receiving parts 47a, 47b have holes for holding the rotation fulcrum pins 67a, 67b shown in FIG. 7.

[0046] As shown in Fig. 6, a first main bobbin convex portion 44 that contacts a first auxiliary bobbin flange 62 of an auxiliary bobbin 60 is formed at the lower part of a first main bobbin flange 42 along the Z-axis. Above the first main bobbin convex portion 44 along the Z-axis, tapered surfaces 44a, 44a that are inclined toward the center of the Y-axis are formed. The tapered surfaces 44a, 44a are formed so as to contact the lower inclined surface along the Z-axis of a first base portion 13 of the first core 10 shown in Fig. 2.

[0047] As shown in Fig. 6, a main bobbin side fitting portion 46c is formed on the end surface on the auxiliary bobbin 60 side along the X-axis of the first main bobbin convex portion 44. The main bobbin side fitting portion 46c is arranged at the center along the Y-axis and is recessed in the X-axis direction.

[0048] As shown in Fig. 7, a lead extraction table 53 is formed above the second main bobbin flange 52 along the Z-axis. Below the lead extraction table 53 along the Z-axis, tapered surfaces 53a, 53a that are inclined toward the center of the Y-axis are formed. The tapered surfaces 53a, 53a are formed so as to contact the upper inclined surface along the Z-axis of a second base portion 23 of the second core 20 shown in Fig. 2.

[0049] Lead grooves 55a to 55d extending along the X-axis are formed side by side along the Y-axis in the lead extraction table 53. The upper parts of the lead grooves 55a to 55d along the Z-axis are cut out, and the bottom surfaces of the lead grooves 55a to 55d are arranged at positions higher than the upper surface of the main bobbin body 50 along the Z-axis.

[0050] As shown in Fig. 7, a second main bobbin convex portion 54 is formed at the lower part of the second main bobbin flange 52 along the Z-axis. Above the second main bobbin convex portion 54 along the Z-axis, tapered surfaces 54a, 54a that are inclined toward the center of the Y-axis are formed. The tapered surfaces 54a, 54a are formed so as to contact the lower inclined surface along the Z-axis of a second base portion 23 of the second core 20 shown in Fig. 2.

[0051] As shown in FIG. 7, the auxiliary bobbin 60 has an auxiliary bobbin body 70 extending along the X-axis direction. An auxiliary bobbin insertion hole 71 is formed in the auxiliary bobbin body 70 along the X-axis. Further, the auxiliary bobbin 60 has a first auxiliary bobbin flange 62 at one end on the X-axis direction side of the auxiliary bobbin body 70 and a second auxiliary bobbin flange 72 at the other end.

[0052] An auxiliary bobbin connecting portion 63 for connecting to the main bobbin 40 is formed above the first auxiliary bobbin flange 62 along the Z-axis. Below the auxiliary bobbin connecting portion 63 along the Z-axis, tapered surfaces 63a, 63a inclined toward the center of the Y-axis are formed. The tapered surfaces 63a, 63a are formed so as to contact the upper inclined surface along the Z-axis of the first base portion 13 of the first core 10 shown in FIG. 2. Further, the auxiliary bobbin connecting portion 63 has an R-shaped curved surface from the surface on the main bobbin 40 side along the X-axis to the upper surface along the Z-axis.

[0053] As shown in FIG. 7, an auxiliary bobbin side communication groove 65 is formed at substantially the center of the Y-axis of the auxiliary bobbin connecting portion 63. That is, as shown in FIG. 1, the auxiliary bobbin side communication groove 65 is arranged at a position corresponding to the main bobbin communication groove 45. As shown in FIG. 7, the upper part of the auxiliary bobbin side communication groove 65 along the Z-axis is cut out, and the bottom surface of the continuous auxiliary bobbin side communication groove 65 is substantially flush with the upper surface of the auxiliary bobbin body 70 along the Z-axis.

[0054] As shown in FIG. 7, a pair of auxiliary bobbin side fitting portions 66a, 66b are formed on the end surface of the auxiliary bobbin connecting portion 63 on the main bobbin 40 side along the X-axis, sandwiching the auxiliary bobbin side communication groove 65 along the Y-axis. That is, the auxiliary bobbin side fitting portions 66a, 66b are arranged at positions corresponding to the main bobbin side fitting portions of the main bobbin connecting portion. The auxiliary bobbin side fitting portions 66a, 66b protrude in the X-axis direction and can be fitted to the main bobbin side fitting portions 46a, 46b of the main bobbin connecting portion 43 shown in FIG. 6.

[0055] As shown in FIG. 7, rotation fulcrum pins 67a and 67b are formed at both ends of the auxiliary bobbin connecting portion 63 along the Y-axis. The rotation fulcrum pins 67a and 67b project outward along the Y-axis and can be inserted into the holes of the fulcrum receiving portions 47a and 47b.

[0056] As shown in FIG. 7, an auxiliary bobbin side fitting portion 66c is formed at the lower part of the first auxiliary bobbin flange 62 along the Z-axis. The auxiliary bobbin side fitting portion 66c is arranged at the center along the Y-axis. That is, the auxiliary bobbin side fitting portion 66c is arranged at a position corresponding to the fitting portion of the first main bobbin convex portion 44. The auxiliary bobbin side fitting portion 66c projects in the X-axis direction and can be fitted into the main bobbin side fitting portion 46c of the first main bobbin convex portion 44 shown in FIG. 6.

[0057] As shown in FIG. 6, an auxiliary bobbin convex portion 73 is formed above the second auxiliary bobbin flange 72 along the Z-axis. Tapered surfaces 73a and 73a that are inclined toward the center of the Y-axis are formed below the auxiliary bobbin convex portion 73 along the Z-axis. The tapered surfaces 73a and 73a are formed so as to contact the upper inclined surface of the third base portion 33 of the third core 30 shown in FIG. 2 along the Z-axis.

[0058] As shown in FIG. 6, an auxiliary bobbin convex portion 74 is formed at the lower part of the second auxiliary bobbin flange 72 along the Z-axis. Tapered surfaces 74a and 74a that are inclined toward the center of the Y-axis are formed above the auxiliary bobbin convex portion 74 along the Z-axis. The tapered surfaces 74a and 74a are formed so as to contact the lower inclined surface of the third base portion 33 of the third core 30 shown in FIG. 2 along the Z-axis.

[0059] As shown in FIG. 4A, the second wire 90 is wound across the main bobbin body 50 of the main bobbin and the auxiliary bobbin body 70 of the auxiliary bobbin. The main bobbin winding portion 92 and the auxiliary bobbin winding portion 94 of the second wire 90 are connected at the intermediate portion 93. The intermediate portion 93 is arranged to pass through the main bobbin communication groove 45 and the auxiliary bobbin side communication groove 65.

[0060] As shown in FIG. 3A, connection terminals 97 and 98 for connecting to an external substrate or the like are attached to the second lead portions 95 and 96 of the second wire 90. The second lead portions 95 and 96 are respectively drawn out from the main bobbin winding portion 92. The second lead portion 95 passes through the lead groove 55a and is drawn out outward along the X-axis. The second lead portion 96 passes through the lead groove 55b and is drawn out outward along the X-axis.

[0061] As shown in FIG. 4A, the first wire 80 is wound on the main bobbin winding portion 92. Also, as shown in FIG. 3A, connection terminals 87 and 88 for connecting to an external substrate or the like are attached to the second lead portions 85 and 86 of the first wire 80. The first lead portion 85 passes through the lead groove 55c and is drawn out outward along the X-axis. The first lead portion 86 passes through the lead groove 55d and is drawn out outward along the X-axis.

[0062] The coil device 1 of the present embodiment can be assembled, for example, according to the following procedure.

[0063] First, in the present embodiment, the rotation fulcrum pins 67a and 67b of the auxiliary bobbin 60 shown in FIG. 6 are passed through the holes of the fulcrum receiving portions 47a and 47b of the main bobbin 40 to connect the main bobbin 40 and the auxiliary bobbin 60. Further, the main bobbin side fitting portions 46a, 46b, and 46c of the main bobbin 40 and the auxiliary bobbin side fitting portions 66a, 66b, and 66c of the auxiliary bobbin 60 shown in FIG. 7 are fitted so that the first main bobbin flange 42 and the first auxiliary bobbin flange 62 are in contact with each other.

[0064] As shown in FIG. 4A, the second wire 90 is wound around the main bobbin 40 and the auxiliary bobbin 60. For winding, an automatic winding machine can be used, for example.

[0065] First, the second wire 90 is wound around the outer periphery of the main bobbin body 50. As shown in FIG. 3, the second wire 90 wound around the main bobbin body 50 is passed through the main bobbin connection groove 45 and the auxiliary bobbin side connection groove 65. As shown in FIG. 4A, the second wire 90 passed through the auxiliary bobbin side connection groove 65 is wound around the outer periphery of the auxiliary bobbin body 70. The second wire 90 wound around the auxiliary bobbin body 70 is passed through the main bobbin connection groove 45 and the auxiliary bobbin side connection groove 65 again. The second wire 90 passed through the main bobbin connection groove 45 is wound on top of the second wire 90 already wound around the main bobbin body 50. The first wire 80 is wound on top of the main bobbin winding portion 92.

[0066] Next, as shown in FIG. 8A, with the pivot pins 67a and 67b of the auxiliary bobbin connecting portion 63 as the pivots, the side of the first auxiliary bobbin flange 62 opposite to the auxiliary bobbin connecting portion 63 is rotated so as to be separated from the first main bobbin flange 42. At this time, the auxiliary bobbin side fitting portions 66a, 66b, and 66c are separated from the fitting portions of the first main bobbin flange 42. In the present embodiment, the second wire 90 can bend freely, and the auxiliary bobbin 60 can be rotated with the main bobbin winding portion 92 and the auxiliary bobbin winding portion 94 connected by the intermediate portion 93.

[0067] Next, the first core 10 shown in FIG. 2 is installed on the main bobbin 40. The first insertion leg portion 11 of the first core 10 is inserted into the main bobbin insertion hole 51 from the side of the first main bobbin flange 42. At this time, the lower inclined surface and the upper inclined surface along the Z axis of the first base portion 13 contact the tapered surface 43a of the connecting portion and the tapered surface 44a of the first main bobbin convex portion 44 shown in FIG. 6, respectively.

[0068] Next, the auxiliary bobbin 60 is returned to its original position, and the auxiliary bobbin side fitting portions 66a, 66b, and 66c shown in FIG. 7 are fitted with the main bobbin side fitting portions 46a, 46b, and 46c of the main bobbin 40 shown in FIG. 6. At this time, the upper inclined surface along the Z axis of the first base portion 13 shown in FIG. 2 contacts the tapered surface 63a of the first auxiliary bobbin connecting portion 63.

[0069] Next, the second core 20 shown in FIG. 2 is installed on the main bobbin 40. The second insertion leg portion 21 of the second core 20 is inserted into the main bobbin insertion hole 51 from the side of the second main bobbin flange 52. At this time, the lower inclined surface and the upper inclined surface along the Z axis of the second base portion 23 are respectively in contact with the tapered surface 53a of the lead extraction table 53 shown in FIG. 7 and the tapered surface 54a of the second main bobbin convex portion 54.

[0070] Next, the third core 30 shown in FIG. 2 is installed on the auxiliary bobbin 60. The third insertion leg portion 31 of the third core 30 is inserted into the auxiliary bobbin insertion hole 71 from the side of the second auxiliary bobbin flange 72. At this time, the lower inclined surface and the upper inclined surface along the Z axis of the third base portion 33 are respectively in contact with the tapered surfaces 73a and 74a of the auxiliary bobbin convex portions 73 and 74 shown in FIG. 6.

[0071] As shown in FIG. 9, in the coil device 1 of the present embodiment, the main bobbin connecting portion 43 is disposed above along the Z axis, which is a part of the circumferential direction of the first main bobbin flange 42 that is the first end of the main bobbin 40. Further, the auxiliary bobbin connecting portion 63 is disposed above along the Z axis, which is a part of the circumferential direction of the first auxiliary bobbin flange 62 that is the first end of the auxiliary bobbin 60. The middle portion 93 of the second wire 90 is passed between the main bobbin connecting portion 43 and the auxiliary bobbin connecting portion 63. Therefore, in the present embodiment, with the middle portion 93 of the second wire 90 or a part of the connecting portion as a rotation fulcrum, the auxiliary bobbin 60 can rotate with respect to the main bobbin 40 to open the main bobbin insertion hole 51 of the main bobbin body 50 (main winding core portion) (FIG. 6). Accordingly, the leg portion of the first core can be inserted into the main bobbin insertion hole 51.

[0072] As a result, as shown in FIG. 9, after continuously winding a single second wire 90 around the main bobbin 40 and the auxiliary bobbin 60, the auxiliary bobbin 60 is rotated with respect to the main bobbin 40 to open the main bobbin insertion hole 51 of the main bobbin body 50, and the leg portion of the first core can be inserted into the main bobbin insertion hole 51.

[0073] After inserting the leg portion of the first core into the main bobbin insertion hole 51, the auxiliary bobbin 60 is rotated in the opposite direction to the above with respect to the main bobbin 40, and the base portion of the first core can be sandwiched between the first main bobbin flange 42 and the first auxiliary bobbin flange 62 of the main bobbin 40. Thereafter, the second core can be attached to the second main bobbin flange 52 which is the second end located on the side opposite to the first main bobbin flange 42 of the main bobbin. Before and after, or simultaneously with that, the third core can be attached to the second auxiliary bobbin flange 72 which is the second end located on the side opposite to the first auxiliary bobbin flange 62 of the auxiliary bobbin 60. The plurality of cores composed of the first core, the second core, and the third core can be arranged so as to form a magnetic circuit along the axis.

[0074] Thus, in this embodiment, even in the coil device 1 having a plurality of cores, after attaching the cores, it is not necessary to connect the ends of the wires to each other, the assembly of the coil device becomes extremely easy, and the reliability of the coil device is improved.

[0075] As shown in FIG. 5, in this embodiment, the first base portion 13 of the first core 10 is disposed between the first main bobbin flange 42 and the auxiliary bobbin flange 62. Further, the second wire 90 is wound across the main bobbin 40 and the auxiliary bobbin 60. By configuring in this way, it becomes easy to adjust the leakage, and it is possible to easily integrate a plurality of elements having different functions.

[0076] As shown in FIG. 9, communication grooves 45 and 65 through which the intermediate portion 93 of the wire 90 passes are formed at corresponding positions (centered along the Y axis) in the main bobbin connecting portion 43 and the auxiliary bobbin connecting portion 63, respectively. By passing the intermediate portion 93 of the wire through the communication grooves 45 and 65, it becomes possible to continuously wind the wire 90 around the main winding core portion and the auxiliary winding core portion using a single wire 90.

[0077] As shown in Fig. 8A, in this embodiment, the auxiliary bobbin connecting portion 63 has a rotation fulcrum pin 67b (67a), and the main bobbin connecting portion 43 has a fulcrum receiving portion 47b (47a). By combining the rotation fulcrum pin 67b (67a) and the fulcrum receiving portion 47b (47a), the auxiliary bobbin 60 is supported by the main bobbin 40, and the main bobbin 40 and the auxiliary bobbin 60 are detachably connected. Note that either one of the rotation fulcrum pin or the fulcrum receiving portion may be provided in the main bobbin connecting portion 43, and the other may be provided in the auxiliary bobbin connecting portion 63. With such a configuration, with the rotation fulcrum pin as a fulcrum, the auxiliary bobbin 60 can be rotated with respect to the main bobbin 40 to open the insertion hole 51 of the main winding core portion 50 (Fig. 6), and the leg portion of the first core can be inserted into the insertion hole.

[0078] Further, the main bobbin 40 and the auxiliary bobbin 60 do not necessarily have to be separable. For example, they may be integrally formed and relatively rotatable via a thin portion serving as a rotation fulcrum.

[0079] As shown in Fig. 6, in this embodiment, the main bobbin 40 has main bobbin side fitting portions 46a, 46b which are fitting concave portions on the fulcrum side that can be detachably fitted. As shown in Fig. 7, the auxiliary bobbin 60 has auxiliary bobbin side fitting portions 66a, 66b which are fitting convex portions on the fulcrum side that can be detachably fitted.

[0080] Further, as shown in Fig. 6, the main bobbin 40 has a main bobbin connecting portion 43c which is a fitting concave portion on the opposite side of the connecting portion 43 along the Z axis and can be detachably fitted. Also, as shown in Fig. 7, the auxiliary bobbin 60 has an auxiliary bobbin side fitting portion 66c which is a fitting convex portion on the opposite side of the connecting portion 63 of the main bobbin 40 along the Z axis and can be detachably fitted.

[0081] With such a configuration, in this embodiment, the main bobbin side fitting portion and the auxiliary bobbin side fitting portion are fitted, and the main bobbin 40 and the auxiliary bobbin 60 can be temporarily fixed, so that the wire winding operation becomes easy. Note that by using a jig for temporarily fixing the auxiliary bobbin 60 to the main bobbin 40, the winding operation can be easily performed even without having a fitting portion.

[0082] Second Embodiment As shown in FIG. 8B, the coil device of the present embodiment has the same configuration as the coil device 1 of the first embodiment and the same operational effects, except for the different structure of the connecting portion. In the following description, the description of overlapping parts will be omitted as much as possible, and the different parts will be mainly described. Also, common members in the drawings are labeled with common member reference numerals.

[0083] As shown in FIG. 8B, in the present embodiment, the main bobbin 40 does not have a fulcrum receiving portion, and the auxiliary bobbin 60 does not have a pivot pin. That is, the auxiliary bobbin connecting portion 63 is not supported by the main bobbin connecting portion 43. Therefore, in the present embodiment, the connecting portion is constituted by the intermediate portion 93 of the wire itself.

[0084] In the present embodiment, the intermediate portion 93 of the wire serving as the connecting portion is disposed above the first main bobbin flange 42, which is the first end of the main bobbin 40, along the Z-axis in the circumferential direction. That is, the intermediate portion 93 of the wire itself serves as the connecting portion, and the intermediate portion 43 of the wire itself rotatably connects the main bobbin 40 and the auxiliary bobbin 60, and the intermediate portion 93 of the wire itself serves as the pivot point.

[0085] In the present embodiment, particularly during the wire winding operation, it is preferable to temporarily fix the auxiliary bobbin 60 to the main bobbin 40. In the present embodiment, fitting portions are formed on the first main bobbin flange 42 and the first auxiliary bobbin flange 62, and the auxiliary bobbin 60 can be temporarily fixed to the main bobbin 40.

[0086] Third Embodiment As shown in FIG. 4B, the coil device 2 of the present embodiment has the same configuration as the coil device 1 of the first embodiment and the same operational effects, except for having the sub-auxiliary bobbin 160 and the fourth core 140. In the following description, the description of overlapping parts will be omitted as much as possible, and the different parts will be mainly described. Also, common members in the drawings are labeled with common member reference numerals.

[0087] In this embodiment, the fourth core 140 has the same shape as the third core 30. That is, the fourth core 140 includes a fourth base portion 143, a pair of fourth outer leg portions 142, 142 connected to the fourth base portion 143, and a fourth insertion leg portion 141 disposed between the fourth outer leg portions 142, 142.

[0088] As shown in FIG. 4B, the end face of the fourth insertion leg portion 141 in the X-axis direction is in contact with the second base portion 23, but is not limited thereto. Also, as shown in FIG. 3B, the end faces of the fourth outer leg portions 142, 142 in the X-axis direction are in contact with the second base portion 23, but are not limited thereto. The lengths of the fourth insertion leg portion 141 and the fourth outer leg portions 142, 32 in the X-axis direction may be adjusted to form a gap at their respective end faces in the X-axis direction.

[0089] As shown in FIG. 4B, the coil device 2 of this embodiment further includes a sub-auxiliary bobbin 160 on the side of the second main bobbin flange 52, which is the other second end, along the axis of the main bobbin 40 (main bobbin body 50).

[0090] In this embodiment, the second main bobbin flange 52 has a structure symmetric along the X-axis with the first main bobbin flange 42. That is, on the upper part of the second main bobbin flange 52 along the Z-axis, a main bobbin connecting portion 153 symmetric along the X-axis with the main bobbin connecting portion 43 is formed, and on the lower part of the second main bobbin flange 52 along the Z-axis, a second main bobbin convex portion 154 symmetric along the X-axis with the first main bobbin convex portion 44 is formed.

[0091] Also, the main bobbin connecting portion 153 is configured to be connected to the sub-auxiliary bobbin connecting portion 163 of the sub-auxiliary bobbin 160. As shown in FIG. 3B, a main bobbin communication groove 155 is formed substantially at the center of the Y-axis of the main bobbin connecting portion 153.

[0092] As shown in FIG. 4B, the sub - auxiliary bobbin 160 has a sub - auxiliary bobbin body 170 extending along the X - axis direction. A sub - auxiliary bobbin insertion hole 171 is formed in the sub - auxiliary bobbin body 170 along the X - axis. Also, a first sub - auxiliary bobbin flange 162 is provided at one end of the sub - auxiliary bobbin body 170 on the X - axis direction side, and a second sub - auxiliary bobbin flange 172 is provided at the other end.

[0093] In this embodiment, the first sub - auxiliary bobbin flange 162 has a structure symmetric with the first auxiliary bobbin flange 62 along the X - axis. That is, a sub - auxiliary bobbin connecting portion 163 symmetric with the auxiliary bobbin connecting portion 63 along the X - axis is formed above the first sub - auxiliary bobbin flange 162 along the Z - axis, and a first sub - auxiliary bobbin convex portion 164 symmetric with the first auxiliary bobbin convex portion 64 along the X - axis is formed below the first sub - auxiliary bobbin flange 162 along the Z - axis.

[0094] Also, the sub - auxiliary bobbin connecting portion 163 is configured to connect with the main bobbin connecting portion 153 of the main bobbin 40. As shown in FIG. 3B, a sub - auxiliary bobbin side communication groove 165 is formed at approximately the center of the Y - axis of the sub - auxiliary bobbin connecting portion 163.

[0095] The second sub - auxiliary bobbin flange 172 has the same configuration as the second main bobbin flange 52. That is, as shown in FIG. 4B, a lead extraction table 173 is formed above the second sub - auxiliary bobbin flange 172 along the Z - axis. A tapered surface inclined toward the center of the Y - axis is formed below the lead extraction table 173 along the Z - axis. The tapered surface is formed so as to contact the upper inclined surface of the fourth base portion 143 of the fourth core 140 along the Z - axis.

[0096] As shown in FIG. 3B, lead grooves 175a - 175d extending along the X - axis are arranged side by side along the Y - axis on the lead extraction table 173. The upper part of the lead grooves 175a - 175d along the Z - axis is cut away, and the bottom surfaces of the lead grooves 175a - 175d are arranged at a position higher than the upper surface of the sub - auxiliary bobbin body 170 along the Z - axis shown in FIG. 4B.

[0097] As shown in FIG. 4B, a second sub - auxiliary bobbin convex portion 174 is formed at the lower part of the second sub - auxiliary bobbin flange 172 along the Z - axis. Above the formation of the second sub - auxiliary bobbin convex portion 174 along the Z - axis, a tapered surface inclined toward the center of the Y - axis is formed. The tapered surface is formed so as to contact the lower inclined surface of the fourth base portion 143 of the fourth core 140 along the Z - axis.

[0098] As shown in FIG. 4B, the second wire 90 is wound across the main bobbin body 50 of the main bobbin and the auxiliary bobbin body 70 of the auxiliary bobbin. The main bobbin winding portion 92 and the auxiliary bobbin winding portion 94 of the second wire 90 are connected at the intermediate portion 93. As shown in FIG. 3B, the intermediate portion 93 is arranged to pass through the main bobbin connection groove 45 and the auxiliary bobbin side connection groove 65.

[0099] As shown in FIG. 3B, connection terminals 97, 98 for connecting to an external substrate or the like are attached to the second lead portions 95, 96 of the second wire 90. The second lead portions 95, 96 are respectively drawn out from the main bobbin winding portion 92. The second lead portion 95 passes through the lead groove 175a and is drawn out outward along the X - axis. The second lead portion 96 passes through the lead groove 175b and is drawn out outward along the X - axis.

[0100] As shown in FIG. 4B, the first wire 180 is wound across the main bobbin body 50 of the main bobbin and the sub - auxiliary bobbin body 170 of the sub - auxiliary bobbin. The main bobbin winding portion 182 and the sub - auxiliary bobbin winding portion 184 of the first wire 180 are connected at the intermediate portion 183. As shown in FIG. 3B, the intermediate portion 183 is arranged to pass through the main bobbin connection groove 155 and the sub - auxiliary bobbin connection groove 165.

[0101] As shown in FIG. 3B, connection terminals 187 and 188 for connecting to an external substrate or the like are attached to the first lead portions 185 and 186 of the first wire 180. The first lead portions 185 and 186 are respectively drawn out from the sub auxiliary bobbin winding portion 184. The first lead portion 185 passes through the lead groove 175c and is drawn out outward along the X-axis. The first lead portion 186 passes through the lead groove 175d and is drawn out outward along the X-axis.

[0102] As shown in FIG. 4B, in the present embodiment, a single continuous first wire 180 different from the second wire 90 is wound around the main bobbin body 50 (main winding core portion) of the main bobbin 40 and the sub auxiliary bobbin body 170 (sub auxiliary winding core portion) of the sub auxiliary bobbin 160. Further, a separate connecting portion (main bobbin connecting portion 153 and sub auxiliary bobbin connecting portion 163) including a portion through which the middle portion 183 of the first wire 180 passes is formed between the main bobbin 40 and the sub auxiliary bobbin 160.

[0103] In the present embodiment, the separate connecting portion (main bobbin connecting portion 153 and sub auxiliary bobbin connecting portion 163) is disposed in a part in the circumferential direction of the second main bobbin flange 52 which is the second end of the main bobbin 40. Further, with the first wire 180 continuously wound around the main winding core portion (main bobbin body 50) and the sub auxiliary winding core portion (sub auxiliary bobbin body 170), the sub auxiliary bobbin 160 rotates with respect to the main bobbin 40 with a part of the separate connecting portion as a rotation fulcrum. By configuring in this way, the insertion hole 51 of the main winding core portion can be opened, and the leg portion 21 of the second core different from the first core can be inserted into the insertion hole 51. Note that the sub auxiliary bobbin connecting portion 163 does not have to be supported by the main bobbin connecting portion 153. For example, the middle portion 183 of the first wire 180 may be used as a rotation fulcrum to rotate.

[0104] The separate connecting portion between the main bobbin 40 and the sub auxiliary bobbin 160 has the same configuration as the connecting portion between the main bobbin and the auxiliary bobbin described above, and exhibits the same operational effects.

[0105] For example, after inserting the leg portion of the second core 20 into the insertion hole 51, the sub - auxiliary bobbin 160 is rotated in a closing direction opposite to the opening direction with respect to the main bobbin 40, and the base portion of the second core 20 can be sandwiched between the second main bobbin flange 52 of the main bobbin 40 and the second sub - auxiliary bobbin flange 172 which is the second end of the sub - auxiliary bobbin 170. Before, after, or simultaneously with that, as described above, the first core 10 can be attached between the first main bobbin flange 42 and the first auxiliary bobbin flange 62. Also, thereafter, the third core 20 is attached to the second end on the side opposite to the first auxiliary bobbin flange 62 which is the first end of the auxiliary bobbin 60, and before and after that, the fourth core 140 can be attached to the second sub - auxiliary bobbin flange 172 which is the outer end of the sub - auxiliary bobbin 160. The plurality of cores including the first core 10, the second core 20, the third core 30, and the fourth core 140 can be arranged so as to form a magnetic circuit along the axis.

[0106] Note that the present invention is not limited to the above - described embodiments, and various modifications can be made within the scope of the present invention.

[0107] In the above - described embodiment, as shown in FIG. 6, above the first main bobbin flange 42 along the Z - axis, a communication groove 45 is formed at one location substantially in the center along the Y - axis. For example, by changing this configuration, the communication groove may be formed at a plurality of locations along the Y - axis above the first main bobbin flange 42 along the Z - axis.

[0108] Corresponding to the position of the communication groove formed in the first main bobbin flange 42, a plurality of communication grooves are also formed in the first auxiliary bobbin flange 62, so that the intermediate portion of the wire can be passed through the respective communication grooves. In this way, even if the intermediate portion of the wire is passed through a plurality of communication grooves, since any intermediate portion is above along the Z - axis, the auxiliary bobbin 60 can be rotated with the wire wound around the main bobbin 40 and the auxiliary bobbin 60 to open the main bobbin insertion hole 51.

[0109] In the above-described embodiment, as shown in FIG. 6, the communication groove 45 is formed above the first main bobbin flange 42 along the Z axis. For example, this configuration may be changed, and the communication groove may be formed on one side along the Y axis of the first main bobbin flange 42.

[0110] By forming a communication groove in the first auxiliary bobbin flange 62 corresponding to the position of the communication groove formed in the first main bobbin flange 42, the middle part of the wire can be passed through the respective communication grooves. In this way, even if the middle part of the wire is passed through the side along the Y axis, since all the middle parts are on one side along the Y axis, the auxiliary bobbin 60 can be rotated with the wire wound around the main bobbin 40 and the auxiliary bobbin 60 to open the main bobbin insertion hole 51.

Explanation of Reference Numerals

[0111] 1, 2... Coil device 10... First core 11... First insertion leg 12... First outer leg 13... First base part 20, 120... Second core 21... Second insertion leg 22... Second outer leg 23... Second base part 30, 130... Third core 31... Third insertion leg 32... Third outer leg 33... Third base part 40... Main bobbin 42... First main bobbin flange 43... Main bobbin connecting part (connecting part) 43a... Tapered surface 44... First main bobbin convex part 44a... Tapered surface 45... Main bobbin communication groove (communication groove) 46a, 46b, 46c... Main bobbin side fitting part (fitting part) 47a, 47b... Fulcrum receiving part 50... Main bobbin body (main winding core part) 51... Main bobbin insertion hole 52, 152... Second main bobbin flange 53…Lead extraction table 153…Main bobbin connection part (separate connection part) 53a…Tapered surface 54, 154…Second main bobbin convex part 54a…Tapered surface 55a, 55b, 55c, 55d…Lead grooves 155…Main bobbin communication groove (communication groove) 156c…Main bobbin side fitting part (fitting part) 60…Auxiliary bobbin 62…First auxiliary bobbin flange 63…Auxiliary bobbin connection part 65…Auxiliary bobbin side communication groove 66a, 66b, 66c…Auxiliary bobbin side fitting parts 67a, 67b…Pivoting fulcrum pins 70…Auxiliary bobbin body (auxiliary core part) 71…Auxiliary bobbin insertion hole 72…Second auxiliary bobbin flange 73, 74…Auxiliary bobbin convex parts 73a, 74a…Tapered surfaces 80, 180…First wire 182…Main bobbin winding part 183…Intermediate part 184…Sub-auxiliary bobbin winding part 85, 86, 185, 186…First lead parts 87, 88, 187, 188…Connection terminals 90…Second wire 92…Main bobbin winding part 93…Intermediate part 94…Auxiliary bobbin winding part 95, 96…Second lead parts 97, 98…Connection terminals 140…Fourth core 141…Fourth insertion leg 142…Fourth outer leg 143…Fourth base part 160…Sub-auxiliary bobbin 162…First sub-auxiliary bobbin flange 163…Sub-auxiliary bobbin connection part (separate connection part) 165…Sub-auxiliary bobbin side communication groove 166c... Sub - auxiliary bobbin side fitting part 170... Sub - auxiliary bobbin body 171... Sub - auxiliary bobbin insertion hole 172... Second sub - auxiliary bobbin flange 173... Lead extraction platform 174... Sub - auxiliary bobbin convex part 175a, 175b, 175c, 175d... Lead grooves

Claims

1. A main bobbin, an auxiliary bobbin disposed at one first end along the axis of the main bobbin, and a first core disposed between the first end of the main bobbin and the first end of the auxiliary bobbin, a coil device having: a single continuous wire is wound around the main winding core portion of the main bobbin and the auxiliary winding core portion of the auxiliary bobbin, a connecting portion including a portion through which an intermediate portion of the wire passes is formed between the main bobbin and the auxiliary bobbin, the connecting portion is disposed at a part in the circumferential direction of the first end of the main bobbin, with the wire continuously wound around the main winding core portion and the auxiliary winding core portion, the auxiliary bobbin rotates with respect to the main bobbin using an intermediate portion of the wire or a part of the connecting portion as a rotation fulcrum, opening an insertion hole of the main winding core portion, and the leg portion of the first core is configured to be insertable into the insertion hole. A coil device.

2. The connecting portion has a main bobbin connecting portion formed at a part in the circumferential direction of the first end of the main bobbin, and an auxiliary bobbin connecting portion formed at a part in the circumferential direction of the first end of the auxiliary bobbin, and communication grooves through which an intermediate portion of the wire passes are formed at corresponding positions between the main bobbin connecting portion and the auxiliary bobbin connecting portion. The coil device according to claim 1.

3. The connecting portion has a thin-walled portion that integrally connects the main bobbin and the auxiliary bobbin by integral molding to serve as a rotation fulcrum, or a combination of a rotatable fulcrum pin and a fulcrum receiving portion that are detachably rotatable. The coil device according to claim 1 or 2.

4. The connecting portion is constituted by the intermediate portion of the wire itself and is disposed at a part in the circumferential direction of the first end of the main bobbin. The coil device according to claim 1 or 2.

5. The connecting portion has a combination of a fulcrum-side fitting convex portion and a fulcrum-side fitting concave portion that are detachably fitted. The coil device according to any one of claims 1 to 4.

6. Along a vertical axis perpendicular to the axis of the main bobbin, between the main bobbin and the auxiliary bobbin located on the side opposite to the connecting portion, there is a combination of a counter-fulcrum-side fitting convex portion and a counter-fulcrum-side fitting concave portion that are detachably fitted. The coil device according to any one of claims 1 to 5.

7. The coil device according to any one of claims 1 to 6, further comprising a sub-auxiliary bobbin disposed at the other second end along the axis of the main bobbin. A separate continuous single wire different from the wire is wound around the main winding core portion of the main bobbin and the auxiliary winding core portion of the sub-auxiliary bobbin. A separate connecting portion including a portion through which a middle portion of the separate wire passes is formed between the main bobbin and the sub-auxiliary bobbin. The separate connecting portion is arranged at a part in the circumferential direction of the second end of the main bobbin. With the separate wire continuously wound around the main winding core portion and the sub-auxiliary winding core portion, with a middle portion of the separate wire or a part of the separate connecting portion as a rotation fulcrum, the sub-auxiliary bobbin rotates with respect to the main bobbin, opens the insertion hole of the main winding core portion, and the leg portion of the second core different from the first core is configured to be insertable into the insertion hole. A coil device.

8. A third core arranged at the second end of the auxiliary bobbin opposite to the first end along the axis, A fourth core arranged at the outer end of the sub-auxiliary bobbin along the axis, The coil device according to claim 7, further comprising:

9. A second core arranged at the second end of the main bobbin opposite to the first end along the axis, A third core arranged at the second end of the auxiliary bobbin opposite to the first end along the axis, The coil device according to any one of claims 1 to 6, further comprising:

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