Coil bobbin and transformer

Abstract

To provide a coil bobbin and a transformer that can align the windings to attach multiple coils and can ensure insulation of the connection wire that connects two coils.SOLUTION: A coil bobbin (2) includes a frame body (200) having an annular groove (2d) formed along the outer periphery, annular walls (2a, 2b, 2c) formed along the circumferential direction inside the groove, and guide portions (2e, 2k) formed between a first chamber (21) formed on one side of the wall inside the groove and a second chamber (22) formed on the other side of the wall inside the groove, for guiding the winding in an insulated state.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present technology relates to a coil bobbin around which a winding is wound and a transformer.

Background Art

[0002] Conventionally, a coil bobbin has been disclosed in which a groove extending in the circumferential direction is formed on the outer peripheral surface of an annular frame body. A dividing wall extending in the circumferential direction is formed inside the groove. Coils are attached to both sides of the dividing wall. The axial width of the coil on one side or the other side of the dividing wall is shorter than that of the coil attached to the groove without providing the dividing wall. The coil is formed by radially stacking layers made of windings, and by shortening the axial width of the coil, it becomes unnecessary to keep the withstand voltage between layers high (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, a coil is attached to the coil bobbin as follows. A winding is wound on one side of the dividing wall to form a first coil, and the winding is cut. Next, a winding is wound on the other side of the dividing wall to form a second coil, and the winding is cut. Thereafter, an operator directly connects the first coil and the second coil with an insulated wire or a crimping sleeve or the like.

[0005] In recent years, in the manufacture of transformers, labor saving has been demanded. For example, after forming a first coil using a machine, it is conceivable to successively form a second coil. However, a part of the winding that connects the first coil and the second coil, that is, the connection wire, is arranged along the partition wall on the second coil side, which inhibits the aligned winding of the second coil. Further, since the connection wire contacts each layer of the second coil, insulation treatment is required for the connection wire.

[0006] In view of such circumstances, the present disclosure has been made, and an object thereof is to provide a coil bobbin and a transformer that can align windings to attach a plurality of coils and can ensure insulation of a connection wire that connects two coils.

Means for Solving the Problems

[0007] A coil bobbin according to an embodiment of the present disclosure includes a frame body having an annular shape and a groove formed along the outer periphery, a wall formed along the circumferential direction inside the groove and having an annular shape, and a first chamber formed on one surface side of the wall inside the groove, and a guide portion that guides the winding in an insulated state, which is formed between the first chamber and a second chamber formed on the other surface side of the wall inside the groove.

[0008] In an embodiment of the present disclosure, a guide portion is provided between the first chamber and the second chamber to align the winding, ensure insulation of the connection wire, and guide the wire.

[0009] In a coil bobbin according to an embodiment of the present disclosure, at least a part of the guide portion is formed inside the wall between one surface and the other surface of the wall.

[0010] In an embodiment of the present disclosure, since the connection wire is arranged between one surface and the other surface of the wall by the guide portion, insulation of the connection wire can be ensured.

[0011] The coil bobbin according to an embodiment of the present disclosure, the guide part is formed in a notch shape at the edge of the wall, a recess continuous with the first chamber, and is arranged adjacent to the recess in the axial direction, and is between a first position in the circumferential direction and a second position different from the first position, and is formed between the outermost peripheral position and the innermost peripheral position of the wall, and has a guide surface continuous with the second chamber.

[0012] In an embodiment of the present disclosure, for example, the connection line can be guided from the first chamber to the second chamber through the recess and the inclined portion.

[0013] The coil bobbin according to an embodiment of the present disclosure, when viewed from the axial direction, the wall has a rectangular shape, and the guide part is provided on any one side of the wall.

[0014] In an embodiment of the present disclosure, a guide part is formed on any one side of the wall. By forming the guide part on one side, the structure of the guide part is simplified, and the manufacturing of the coil bobbin by a mold becomes easier.

[0015] The coil bobbin according to an embodiment of the present disclosure, the guide part is provided across a plurality of sides of the wall.

[0016] In an embodiment of the present disclosure, since the guide part is formed across a plurality of sides of the wall, the guiding of the connection line between the first chamber and the second chamber is gradually performed. Therefore, when the winding is automatically attached using a machine, it is difficult to fail.

[0017] The transformer according to an embodiment of the present disclosure includes a frame body having an annular shape and a groove formed along the outer periphery, a winding wound around the groove, a wall formed along the circumferential direction inside the groove and having an annular shape, a first chamber formed on one side of the wall inside the groove, and a second chamber formed on the other side of the wall inside the groove, and a guide part formed between them for guiding the winding in an insulated state.

[0018] In one embodiment of the present disclosure, since a guide portion is provided between the first chamber and the second chamber, a part of the winding that connects the two coils, that is, the connection wire, is not disposed in the first chamber or the second chamber, and the windings can be aligned in the first chamber and the second chamber. Further, insulation of the connection wire can be ensured.

Advantages of the Invention

[0019] In the coil bobbin and the transformer according to one embodiment of the present disclosure, since a guide portion is provided between the first chamber and the second chamber, a part of the winding that connects the two coils, that is, the connection wire, is not disposed in the first chamber or the second chamber, and the windings can be aligned in the first chamber and the second chamber. Further, insulation of the connection wire can be ensured.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Embodiments for Carrying Out the Invention

[0021] (Embodiment 1) Hereinafter, the present invention will be described based on the drawings showing a transformer according to Embodiment 1. In the following description, the up-down, front-back, left-right directions shown in the drawings are used. FIG. 1 is a schematic exploded perspective view of a transformer.

[0022] The transformer 1 includes a resin coil bobbin 2, and the coil bobbin 2 includes a rectangular annular frame body 200. The four corners of the frame body 200 are curved in an arc shape. The axial direction of the frame body 200 corresponds to the front-back direction, the direction parallel to the long side portion of the frame body 200 corresponds to the up-down direction, and the direction parallel to the short side portion of the frame body 200 corresponds to the left-right direction.

[0023] A groove 2d extending in the circumferential direction is formed on the outer peripheral surface of the frame body 200, and the groove 2d is provided on the entire circumference of the frame body 200. At the bottom of the groove 2d, three walls 2a, 2b, and 2c protruding radially outward are formed. The walls 2a, 2b, and 2c extend in the circumferential direction and are provided over the entire circumference of the frame body 200. The wall 2a is arranged on the rear side, the wall 2c is arranged on the front side, and the wall 2b is arranged between the wall 2a and the wall 2c.

[0024] A winding is wound between the rear surface of the wall 2a and the rear side surface 2da of the groove 2d, and the primary coil 3 is attached. A winding is wound between the front surface of the wall 2a and the rear surface of the wall 2b, and the primary coil 4 is attached. A winding is wound between the front surface of the wall 2b and the rear surface of the wall 2c, and the primary coil 5 is attached. A winding is wound between the front surface of the wall 2c and the front side surface 2db of the groove 2d, and the primary coil 6 is attached. That is, the coil bobbin 2 holds the primary coils 3 to 6. As will be described later, a first chamber is formed between the rear surface of the wall 2c and the front surface of the wall 2b, and a second chamber is formed between the front surface of the wall 2c and the front side surface 2db of the groove 2d.

[0025] An inner secondary coil 8 (hereinafter referred to as the inner secondary coil 8) is provided inside the frame 200 in the radial direction. The radial dimension of the outer periphery of the inner secondary coil 8 corresponds to the radial dimension and the axial dimension of the inner periphery of the coil bobbin 2, and the inner secondary coil 8 fits inside the coil bobbin 2. The inner secondary coil 8 has a structure that maintains its own shape and can maintain the coil shape without a holding mechanism such as a bobbin. The inner secondary coil 8 is formed, for example, by bending a flat wire. Instead of the flat wire, a group of wires in which a plurality of round wires are integrated may be used. For example, a group of wires is created by restraining a plurality of round wires with a band or solidifying them with resin. The group of wires can achieve shape retention in the same manner as the flat wire.

[0026] An outer secondary coil 9 (hereinafter referred to as the outer secondary coil 9) is provided outside the frame 200 in the radial direction. The radial dimension and the axial dimension of the inner periphery of the outer secondary coil 9 correspond to the radial dimension of the outer periphery of the coil bobbin 2, and the coil bobbin 2 fits inside the outer secondary coil 9. The outer secondary coil 9 has a structure that maintains its own shape and can maintain the coil shape without a holding mechanism such as a bobbin. The outer secondary coil 9 is formed, for example, by bending a flat wire. Note that the outer secondary coil 9 and the inner secondary coil 8 may be constituted by a wire material that can maintain its own shape, for example, a round wire having a diameter capable of maintaining the coil shape, not limited to the flat wire.

[0027] The two long sides of the frame body 200, the outer secondary coil 9, and the inner secondary coil 8 are covered by the first cover portion 10a and the second cover portion 10b. The first cover portion 10a has two semi-cylindrical portions corresponding to the two long sides. The second cover portion 10b has two semi-cylindrical portions corresponding to the two long sides. The first cover portion 10a and the second cover portion 10b face each other in the front-rear direction and are attached to the frame body 200, the outer secondary coil 9, and the inner secondary coil 8 such that the long sides are disposed inside the semi-cylindrical portions. A cylindrical iron core (not shown) is provided around the first cover portion 10a and the second cover portion 10b.

[0028] FIG. 2 is a schematic perspective view of the coil bobbin 2 viewed from the upper left direction, FIG. 3 is a perspective view of the coil bobbin 2 viewed from the upper right direction, FIG. 4 is a schematic plan view of the coil bobbin 2, FIG. 5 is a schematic left side view of the coil bobbin 2, FIG. 6 is a schematic front cross-sectional view taken along the cutting line VI-VI shown in FIG. 5, FIG. 7 is a schematic partial enlarged plan view of the portion surrounded by the VII line in FIG. 4, and FIG. 8 is a schematic partial enlarged left side view taken along the cutting line VIII-VIII shown in FIG. 7.

[0029] The upper portion 20 of the wall 2c includes a front surface portion 2ca and a rear surface portion 2cb. As shown in FIG. 6, in a front view, the front surface portion 2ca has a trapezoidal shape with the right side and the left side as the upper base and the lower base, respectively. The upper side of the front surface portion 2ca descends and inclines toward the right side. The lower side of the front surface portion 2ca extends left and right along the inner circumference of the frame body 200. As shown in FIG. 4, the right front portion of the front surface portion 2ca is slightly inclined such that the right side portion is located behind the left side portion. That is, the front-rear width of the right portion of the front surface portion 2ca becomes shorter toward the right side.

[0030] The rear surface portion 2cb has a rectangular shape extending left and right and is disposed to face the rear surface of the front surface portion 2ca. The rear surface portion 2cb and the front surface portion 2ca are appropriately spaced apart in the front-rear direction. The right end portion of the rear surface portion 2cb extends to the right side of the front surface portion 2ca and is continuous with the inclined surface 2cc. The inclined surface 2cc inclines such that the right side portion is located in front of the left side portion. The front surface portion 2ca is not disposed on the right end portion of the rear surface portion 2cb and the front side of the inclined surface 2cc.

[0031] A notch-shaped recess 2e is formed in the upper edge portion of the left part of the rear portion 2cb. As shown in FIGS. 2 to 4, FIG. 6 and FIG. 7, the recess 2e includes a bottom surface 2f, an inclined surface 2g, and a vertical surface 2h.

[0032] The bottom surface 2f extends horizontally. The inclined surface 2g is continuous with the right end of the bottom surface 2f. The inclined surface 2g slopes upward as it extends toward the right side. The vertical surface 2h is continuous with the left end of the bottom surface 2f and extends upward substantially perpendicularly from the bottom surface 2f. As shown in FIG. 7, the vertical surface 2h extends forward of the bottom surface 2f and is continuous with the left side of the rear surface of the front portion 2ca.

[0033] A guide surface 2k extending horizontally is formed between the front portion 2ca and the rear portion 2cb. The guide surface 2k slopes downward as it extends toward the right side. The guide surface 2k is disposed below the upper side of the front portion 2ca and is substantially parallel to the upper side of the front portion 2ca. The left end of the guide surface 2k is continuous with the front portion of the vertical surface 2h.

[0034] As shown in FIG. 4, the guide surface 2k is inclined such that the right side portion is located in front of the left side portion. That is, the guide surface 2k slopes downward so as to approach the front surface of the front portion 2ca as it extends toward the right side. The guide surface 2k extends to the right of the right side of the front portion 2ca and is continuous with the lower side of the inclined surface 2cc.

[0035] When the position of the vertical surface 2h in the circumferential direction of the frame body 200, in other words, in the left-right direction, is defined as the first position P1, and the position of the inclined surface 2cc is defined as the second position P2, the guide surface 2k is formed between the first position P1 and the second position P2 (see FIG. 6). Also, in the radial direction of the frame body 200, the vertical surface 2h is disposed at the outermost peripheral position of the wall 2c, and the lower side of the inclined surface 2cc is disposed at the innermost peripheral position of the wall 2c. That is, the guide surface 2k is formed between the outermost peripheral position and the innermost peripheral position of the wall 2c. As shown in FIG. 6, the upper right corner portion of the frame body 200 is curved in an arc shape protruding radially outward in a front view, and the guide surface 2k extends in the tangential direction of the arc shape.

[0036] On the right side of the inclined surface 2cc and the left side of the vertical surface 2h, the wall 2c forms a single wall. That is, the upper part 20 of the wall 2c has a front surface part 2ca and a rear surface part 2cb arranged side by side in the front-rear direction, forming a double-wall structure, but the other parts of the wall 2c do not form a double structure.

[0037] A first chamber 21 with an opening on the radially outer side is formed between the rear surface of the wall 2c and the front surface of the wall 2b. A second chamber 22 with an opening on the radially outer side is formed between the front surface of the wall 2c and the front side surface 2db of the groove 2d. The recess 2e is continuous with the first chamber 21. The guide surface 2k is continuous with the recess 2e and the second chamber 22. That is, the recess 2e and the guide surface 2k communicate the first chamber 21 and the second chamber 22 in the front-rear direction. The front surface part 2ca, the rear surface part 2cb, the recess 2e and the guide surface 2k are included in the guide part.

[0038] After the primary coil 5 is attached to the first chamber 21, the winding at the outermost peripheral position of the primary coil 5 is guided to the second chamber 22 by the recess 2e, the guide surface 2k and the inclined surface 2cc, reaches the bottom surface of the second chamber 22, and is arranged along the front surface of the wall 2c. In the second chamber 22, the winding is wound and the primary coil 6 is attached. Since the guide surface 2k is sandwiched between the front surface part 2ca and the rear surface part 2cb, the winding arranged on the guide surface 2k, that is, the connection line connecting the two adjacent primary coils 5 and 6, does not contact the primary coil 6. That is, the connection line is insulated from the primary coil 6.

[0039] The difference between the highest potential of the primary coil 5 and the highest potential of the primary coil 6 can be 2000V in some cases. However, as described above, the guide part can surely insulate the connection line from the primary coil 6.

[0040] In addition, on the upper parts of the wall 2a and the wall 2b respectively, structures similar to the front surface part 2ca, the rear surface part 2cb, the recess 2e and the guide surface 2k are also formed, but the detailed description thereof is omitted. The connection line connecting two adjacent primary coils 3 and 4 is insulated from the primary coil 4, and the connection line connecting two adjacent primary coils 4 and 5 is insulated from the primary coil 5.

[0041] Also, the connecting wires connecting the primary coils 3 and 4 are guided along the front surface of the wall 2a and along the bottom surface of the groove 2d. Also, the connecting wires connecting the primary coils 4 and 5 are guided along the front surface of the wall 2b and along the bottom surface of the groove 2d.

[0042] Also, by forming the front surface portion 2ca, the rear surface portion 2cb, the recess 2e, and the guide surface 2k only on the upper portion 20 of the wall 2c, the structure of the guide portion is simplified, and the coil bobbin 2 can be easily manufactured by a mold. Note that the upper portion 20 of the wall 2c is an example of a side portion of the wall 2c that forms a rectangle when viewed from the front, and the front surface portion 2ca, the rear surface portion 2cb, the recess 2e, and the guide surface 2k may be formed on the right portion, the left portion, or the lower portion of the wall 2c.

[0043] In the transformer 1 and the coil bobbin 2 according to the first embodiment, since a guide portion is provided between the first chamber 21 and the second chamber 22, no connecting wire is arranged in the first chamber 21 or the second chamber 22, and the windings can be aligned in the first chamber 21 and the second chamber 22. Also, insulation of the connecting wire can be ensured.

[0044] Also, since the connecting wire is arranged between the front surface portion 2ca and the rear surface portion 2cb by the guide portion, insulation of the connecting wire can be ensured. Also, the connecting wire can be guided from the first chamber 21 to the second chamber 22 through the recess 2e and the guide surface 2k.

[0045] Also, since the guide portion is formed over the first position P1 in the circumferential direction and the second position P2 away from the first position P1, the guide of the connecting wire between the first chamber 21 and the second chamber 22 is gradually performed. Therefore, even when the winding is automatically attached using a machine, it is difficult to fail.

[0046] (Second Embodiment) The following description will be based on the drawings showing the transformer 1 according to Embodiment 2 of the present invention. Among the configurations according to Embodiment 2, the same configurations as those in Embodiment 1 are denoted by the same reference numerals, and detailed descriptions thereof are omitted. FIG. 9 is a schematic perspective view of the coil bobbin 2 viewed from the upper left direction, FIG. 10 is a schematic left side view of the coil bobbin 2, FIG. 11 is a schematic plan view of the coil bobbin 2, FIG. 12 is a schematic front cross-sectional view taken along the cutting line XII-XII shown in FIG. 10, FIG. 13 is a schematic cross-sectional view taken along the cutting line XIII-XIII shown in FIG. 10, FIG. 14 is a schematic cross-sectional view taken along the cutting line XIV-XIV shown in FIG. 10, and FIG. 15 is a schematic partially enlarged perspective view of the coil bobbin 2.

[0047] A notch-shaped recess 2E is formed at the edge portion of the left part 23 of the wall 2c. As shown in FIG. 13, the recess 2E is formed at the rear part of the wall 2c. Hereinafter, the portion of the wall 2c where the recess 2E is formed is referred to as the rear surface portion 2c2, and the front part where the recess 2E is not formed is referred to as the front surface portion 2c1.

[0048] As shown in FIG. 12, a guide surface 2c3 is formed from the central portion in the vertical direction of the recess 2E across the upper part 20 of the wall 2c. The guide surface 2c3 includes a first guide surface 31, a second guide surface 32, and a third guide surface 33. As shown in FIG. 14, the first guide surface 31 is formed at the front side portion of the rear surface portion 2c2 in the left part 23. The first guide surface 31 extends vertically and is inclined so that the upper side portion is located to the right of the lower side portion. The first guide surface 31 is disposed between the front surface portion 2c1 and the rear surface portion 2c2.

[0049] The second guide surface 32 is formed at the connecting portion of the left part 23 and the upper part 20. The second guide surface 32 extends horizontally, and the left end of the second guide surface 32 is continuous with the upper end of the first guide surface 31. The second guide surface 32 slopes upward as it goes to the right.

[0050] The upper part 20 is continuous with the rear surface part 2c2. An inclined surface 20a is formed at the center in the left - right direction on the front surface of the upper part 20. The inclined surface 20a is inclined such that the right - hand side part is positioned in front of the left - hand side part. The third guide surface 33 is formed on the upper part 20. The third guide surface 33 extends horizontally, the left end of the third guide surface 33 is continuous with the right end of the second guide surface 32, and the right end of the third guide surface 33 is continuous with the left end of the inclined surface 20a.

[0051] The front surface part 2c1 is disposed between the lower end of the concave part 2E and the left end of the inclined surface 20a, and forms an inverted L - shape in front view. As shown in FIG. 9, the right end of the front surface part 2c1 is not connected to the upper part 20. As shown in FIGS. 9, 14, and 15, the guide surface 2c3 is formed between the front surface part 2c1 and the rear surface part 2c2 across the left part 23 and the upper part 20, and forms an inverted L - shape in front view.

[0052] When the base - end position of the first guide surface 31 on the bottom surface of the concave part 2E, in other words, the lower - end position of the first guide surface 31 is defined as the first position P1, and the right - end position of the front surface part 2c1, in other words, the right - end position of the third guide surface 33 is defined as the second position P2, the guide surface 2c3 is formed between the first position P1 and the second position P2 in the circumferential direction of the frame body 200 (see FIGS. 11 and 12). Also, in the radial direction of the frame body 200, the bottom surface of the concave part 2E is disposed slightly on the inner - circumferential side of the outermost circumference of the wall 2c, and the right end of the third guide surface 33 is disposed at the innermost - circumference position of the wall 2c. That is, the guide surface 2c3 is formed between the outermost - circumference position and the innermost - circumference position of the wall 2c. The front surface part 2c1, the rear surface part 2c2, the concave part 2E, and the guide surface 2c3 are included in the guide part.

[0053] Between the first position P1 and the second position P2, the wall 2c has the front surface part 2c1 and the rear surface part 2c2 separated from each other before and after with the guide surface 2c3 interposed therebetween, that is, forms a double - wall structure, but the other parts of the wall 2c do not form a double structure.

[0054] After the primary coil 5 is attached to the first chamber 21, the winding at the outermost peripheral position of the primary coil 5 is guided to the second chamber 22 by the concave portion 2E, the guide surface 2c3, and the inclined surface 20a, reaches the bottom surface of the second chamber 22, and is arranged along the front surface of the wall 2c. In the second chamber 22, the winding is wound and the primary coil 6 is attached. Since the guide surface 2c3 is sandwiched between the front surface portion 2c1 and the rear surface portion 2c2, the winding arranged on the guide surface 2c3, that is, the connection line connecting the two adjacent primary coils 5 and 6, does not contact the primary coil 6. That is, the connection line is insulated from the primary coil 6.

[0055] Note that similar configurations such as the front surface portion 2c1, the rear surface portion 2c2, the concave portion 2E, and the guide surface 2c3 are also formed at the upper portions of the walls 2a and 2b, respectively, but detailed descriptions thereof are omitted. The connection line connecting the two adjacent primary coils 3 and 4 is insulated from the primary coil 4, and the connection line connecting the two primary coils 4 and 5 is insulated from the primary coil 5.

[0056] In the transformer according to the second embodiment, since the guide portion is formed across the left portion 23 and the upper portion 20 of the wall 2c, and also across the first position P1 in the circumferential direction and the second position P2 away from the first position P1, the connection line between the first chamber 21 and the second chamber 22 is gradually guided. Therefore, even when the winding is automatically attached using a machine, it is difficult to fail.

[0057] Note that the upper part 20 and the left part 23 of the wall 2c are examples of the side parts of the wall 2c that form a rectangle in the front view. Across two consecutive side parts of the wall 2c, a front surface part 2c1, a rear surface part 2c2, a recess 2E, and a guide surface 2c3 may be formed. The two consecutive side parts are, for example, the left part and the lower part, the right part and the upper part, the right part or the lower part. Also, across three consecutive side parts of the wall 2c, a front surface part 2c1, a rear surface part 2c2, a recess 2E, and a guide surface 2c3 may be formed. The three consecutive side parts are, for example, the right part, the left part and the upper part, the right part, the left part and the lower part, the upper part, the lower part and the left part, or the upper part, the lower part and the right part. The transformer 1 according to the above-described Embodiments 1 and 2 has a triple coil structure in which the secondary coils 8 and 9 are provided inside and outside the diameter of the frame 200, but a double coil structure in which only the secondary coil 9 is provided outside the frame 200 or a double coil structure in which only the secondary coil 8 is provided inside the frame 200 may also be used.

[0058] In the above-described embodiments, four primary coils 3 to 6 are provided, but the number of primary coils may be plural, and two, three, or five or more primary coils may be provided.

[0059] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of the claims and the scope equivalent to the claims.

Explanation of Reference Numerals

[0060] 1 Transformer 2 Coil bobbin 2a to 2c Walls 2e, 2E Recess (guide part) 2k, 2c3 Guide surface (guide part) 3 to 6 Primary coils (windings) 21 First chamber 22 Second chamber P1 First position P2 Second position 31 First guide surface 32 Second guide surface 33 Third guide surface 200 Frame

Claims

1. A frame body having an annular shape and a groove formed along the outer periphery, A wall formed along the circumferential direction inside the groove and having an annular shape, A guide portion formed between a first chamber formed on one side of the wall inside the groove and a second chamber formed on the other side of the wall inside the groove, and guiding the winding in an insulated state Comprising The guide portion Is formed in a notch shape at the edge of the wall, and a recess connected to the first chamber, Is arranged adjacent to the recess in the axial direction, and is formed between a first position in the circumferential direction and a second position different from the first position, and between the outermost peripheral position and the innermost peripheral position of the wall, a guide surface connected to the second chamber, A wall surface portion arranged adjacent to the guide surface in the axial direction and extending outward from the bottom surface of the groove to the outside of the guide surface in the radial direction Having The recess is formed at the first position, The guide surface is inclined so as to approach the innermost peripheral position from the outermost peripheral position as it approaches the second position from the first position in the circumferential direction, The portion of the wall surface portion extending outside the guide surface has an opposing side parallel to and facing the guide surface, The guide surface is inclined so as to be connected to the recess and the second chamber and intersect the wall when viewed from the radial direction, When viewed from the axial direction, the dimension between the opposing side and the guide surface is constant, When viewed from the axial direction, the wall has a rectangular shape, The guide portion is provided on one of the side portions of the wall, The groove has a rectangular annular shape with rounded corners, The guide surface extends in the tangential direction of the rounded arc and is connected to the corner portion of the groove Coil bobbin.

2. At least a part of the guide portion is formed between one surface and the other surface of the wall inside the wall, Formed The coil bobbin according to claim 1.

3. A frame body having an annular shape and a groove formed along the outer periphery, A winding wound around the groove, A wall formed along the circumferential direction inside the groove and having an annular shape, A first chamber formed on one side of the wall inside the groove and the other A guide portion formed between a second chamber formed on the surface side and guiding the winding in an insulated state between the first chamber and the second chamber And Comprising The guide portion Is formed in a notch shape at the edge of the wall, and a recess connected to the first chamber, Is arranged adjacent to the recess in the axial direction, and is different from the first position in the circumferential direction Between the second position and the second position, and is formed between the outermost peripheral position and the innermost peripheral position of the wall, the first 2 A guide surface connected to the chamber It is arranged adjacent to the guide surface in the axial direction and has a wall surface portion that extends radially outward from the bottom surface of the groove beyond the guide surface, and has the recess is formed at the first position, the guide surface is inclined so as to approach the innermost peripheral position from the outermost peripheral position as it approaches the second position from the first position in the circumferential direction, the portion of the wall surface portion that extends beyond the guide surface has an opposing side that is parallel to and faces the guide surface, the guide surface is inclined so as to connect the recess and the second chamber and intersect the wall when viewed in the radial direction, when viewed in the axial direction, the dimension between the opposing side and the guide surface is constant, when viewed in the axial direction, the wall has a rectangular shape, the guide portion is provided on one of the side portions of the wall, the groove has a rectangular annular shape with four corners curved in an arc shape, the guide surface extends in the tangential direction of the arc shape and is continuous with the corner portion of the groove, Transformer. ​

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