JP7704953B2 - Coil bobbin and transformer - Google Patents

Description

This technology relates to a coil bobbin on which the windings are wound and a transformer.

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. A dividing wall extending in the circumferential direction is formed inside the groove. A coil is attached to each side 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 a coil attached to the groove without a dividing wall. The coil is formed such that layers of windings are overlapped in the radial direction, and by shortening the axial width of the coil, it is not necessary to maintain a high withstand voltage between layers (see, for example, Patent Document 1).

JP 2018-82080 A

For example, a coil is attached to the coil bobbin as follows: A wire is wound around one side of the partition wall to form a first coil, and the winding is then cut. Next, a wire is wound around the other side of the partition wall to form a second coil, and the winding is then cut. After that, the worker directly connects the first coil and the second coil with an insulated wire or a crimped sleeve, etc.

In recent years, there has been a demand for labor-saving in the manufacture of transformers. For example, it is possible to use a machine to form the first coil and then the second coil. However, part of the winding that connects the first coil and the second coil, i.e., the connection wire, is arranged along the dividing wall on the second coil side, which hinders the aligned winding of the second coil. Furthermore, since the connection wire comes into contact with each layer of the second coil, it is necessary to insulate the connection wire.

This disclosure was made in consideration of these circumstances, and aims to provide a coil bobbin and transformer that can align the windings to attach multiple coils and ensure insulation of the connection wire that connects the two coils.

A coil bobbin according to one embodiment of the present disclosure includes a ring-shaped frame having a groove formed along the outer periphery, a ring-shaped wall formed along the circumferential direction inside the groove, and 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, which guides the winding in an insulated state.

In one embodiment of the present disclosure, a guide is provided between the first and second chambers to align the windings, ensure insulation of the connecting wires, and guide the wire.

In one embodiment of the coil bobbin of the present disclosure, at least a portion of the guide portion is formed inside the wall, between one surface and the other surface of the wall.

In one embodiment of the present disclosure, the guide portion positions the connection line between one side and the other side of the wall, ensuring insulation of the connection line.

In a coil bobbin according to one embodiment of the present disclosure, the guide portion has a recess formed in a notch shape on the edge of the wall and connected to the first chamber, and a guide surface arranged next to the recess in the axial direction, between a first position in the circumferential direction and a second position different from the first position, and formed between the outermost and innermost positions of the wall, connected to the second chamber.

In one embodiment of the present disclosure, for example, a connection line can be guided from the first chamber to the second chamber via a recess and an inclined portion.

When viewed from the axial direction, the coil bobbin according to one embodiment of the present disclosure has a rectangular wall, and the guide portion is provided on one of the sides of the wall.

In one embodiment of the present disclosure, a guide portion is formed on one of the sides of the wall. By forming the guide portion on one side, the structure of the guide portion is simplified, making it easier to manufacture the coil bobbin using a mold.

In one embodiment of the coil bobbin of the present disclosure, the guide portion is provided along multiple sides of the wall.

In one embodiment of the present disclosure, a guide portion is formed along multiple sides of the wall, so that the connection wire is gradually guided between the first and second chambers. Therefore, when the winding is automatically attached using a machine, it is less likely to fail.

A transformer according to one embodiment of the present disclosure includes a ring-shaped frame having a groove formed along the outer periphery, a winding wound in the groove, a ring-shaped wall formed along the circumferential direction inside the groove, and 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, which guides the winding in an insulated state.

In one embodiment of the present disclosure, a guide portion is provided between the first and second chambers, so that a portion of the winding that connects the two coils, i.e., the connecting wire, is not disposed in the first or second chamber, and the winding can be aligned in the first and second chambers. Also, insulation of the connecting wire can be ensured.

In the coil bobbin and transformer according to one embodiment of the present disclosure, a guide portion is provided between the first and second chambers, so that a portion of the winding that connects the two coils, i.e., the connection wire, is not disposed in the first or second chamber, and the winding can be aligned in the first and second chambers. Insulation of the connection wire can also be ensured.

FIG. 2 is a simplified exploded perspective view of the transformer according to the first embodiment. FIG. 2 is a schematic perspective view of a coil bobbin as viewed from the upper left direction. FIG. 2 is a perspective view of the coil bobbin as viewed from the upper right direction. FIG. 2 is a schematic plan view of a coil bobbin. FIG. 2 is a schematic left side view of a coil bobbin. 6 is a schematic front cross-sectional view taken along line VI-VI in FIG. 5. FIG. 7 is a schematic partial enlarged plan view of a portion surrounded by line VII in FIG. 4 . 8 is a schematic partially enlarged left side view taken along line VIII-VIII in FIG. 7. FIG. 11 is a schematic perspective view of a coil bobbin according to a second embodiment as viewed from the upper left direction. FIG. 2 is a schematic left side view of a coil bobbin. FIG. 2 is a schematic plan view of a coil bobbin. 11 is a schematic front cross-sectional view taken along line XII-XII in FIG. 10. 11 is a schematic cross-sectional view taken along line XIII-XIII in FIG. 10. 11 is a schematic cross-sectional view taken along line XIV-XIV shown in FIG. 10. FIG. 2 is a partially enlarged schematic perspective view of a coil bobbin.

(Embodiment 1)
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing a transformer according to a first embodiment. In the following description, the directions up, down, front, back, left and right shown in the drawings will be used. Fig. 1 is a simplified exploded perspective view of a transformer.

The transformer 1 is equipped with a resin coil bobbin 2, which is equipped with a rectangular ring-shaped frame 200. The four corners of the frame 200 are curved into an arc shape. The axial direction of the frame 200 corresponds to the front-to-rear direction, the direction parallel to the long sides of the frame 200 corresponds to the up-down direction, and the direction parallel to the short sides of the frame 200 corresponds to the left-to-right direction.

A groove 2d is formed on the outer peripheral surface of the frame body 200, extending in the circumferential direction, and the groove 2d is provided around the entire circumference of the frame body 200. Three walls 2a, 2b, and 2c protruding radially outward are formed at the bottom of the groove 2d. The walls 2a, 2b, and 2c extend in the circumferential direction and are provided around the entire circumference of the frame body 200. The wall 2a is disposed on the rear side, the wall 2c is disposed on the front side, and the wall 2b is disposed between the walls 2a and 2c.

A winding is wound between the rear surface of wall 2a and the rear side surface 2da of groove 2d, and primary coil 3 is attached. A winding is wound between the front surface of wall 2a and the rear surface of wall 2b, and primary coil 4 is attached. A winding is wound between the front surface of wall 2b and the rear surface of wall 2c, and primary coil 5 is attached. A winding is wound between the front surface of wall 2c and the front side surface 2db of groove 2d, and 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 wall 2c and the front surface of wall 2b, and a second chamber is formed between the front surface of wall 2c and the front side surface 2db of groove 2d.

A secondary coil 8 (hereinafter referred to as the inner secondary coil 8) is provided on the radial inside of the frame body 200. The radial dimensions of the outer circumference of the inner secondary coil 8 correspond to the radial and axial dimensions of the inner circumference 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 retains its own shape, and can maintain its coil shape even without a retaining mechanism such as a bobbin. The inner secondary coil 8 is made of, for example, a rectangular wire, and is formed by bending the rectangular wire. Instead of the rectangular wire, a wire group formed by integrating multiple round wires may be used. For example, the wire group is created by binding multiple round wires with a band or solidifying them with resin. The wire group can maintain its shape like a rectangular wire.

A secondary coil 9 (hereinafter referred to as the outer secondary coil 9) is provided on the radial outside of the frame body 200. The radial and axial dimensions of the inner circumference of the outer secondary coil 9 correspond to the radial dimensions of the outer circumference 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 retains its own shape, and can maintain its coil shape even without a retaining mechanism such as a bobbin. The outer secondary coil 9 is made of, for example, a rectangular wire, and is formed by bending the rectangular wire. Note that the outer secondary coil 9 and the inner secondary coil 8 may be made of wire that can retain its own shape, not limited to rectangular wire, such as a round wire with a diameter that can retain the coil shape.

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 part 10a and the second cover part 10b. The first cover part 10a has two semi-cylindrical parts corresponding to the two long sides. The second cover part 10b has two semi-cylindrical parts corresponding to the two long sides. The first cover part 10a and the second cover part 10b face each other in the front-to-rear direction, and are attached to the frame body 200, the outer secondary coil 9, and the inner secondary coil 8 so that the long sides are positioned inside the semi-cylindrical parts. A cylindrical iron core (not shown) is provided around the first cover part 10a and the second cover part 10b.

2 is a schematic perspective view of the coil bobbin 2 as viewed from the upper left, FIG. 3 is a schematic perspective view of the coil bobbin 2 as viewed from the upper right, 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 line VI-VI in FIG. 5, FIG. 7 is a schematic partial enlarged plan view of the portion surrounded by line VII in FIG. 4, and FIG. 8 is a schematic partial enlarged left side view taken along line VIII-VIII in FIG. 7.

The upper portion 20 of the wall 2c has a front portion 2ca and a rear portion 2cb. As shown in FIG. 6, when viewed from the front, the front portion 2ca is trapezoidal with the right and left sides as the upper and lower bases. The upper side of the front portion 2ca slopes downward toward the right side. The lower side of the front portion 2ca extends left and right along the inner circumference of the frame body 200. As shown in FIG. 4, the front right portion of the front portion 2ca is slightly sloped so that the right side is located behind the left side. In other words, the front-to-rear width of the right portion of the front portion 2ca becomes shorter toward the right side.

The rear surface portion 2cb has a rectangular shape extending from left to right, and is arranged so as to face the rear surface of the front surface portion 2ca. The rear surface portion 2cb and the front surface portion 2ca are separated by an appropriate length in the front-to-rear direction. The right end portion of the rear surface portion 2cb extends further to the right than the front surface portion 2ca, and is connected to the inclined surface 2cc. The inclined surface 2cc is inclined so that the right side portion is located forward of the left side portion. The front surface portion 2ca is not arranged in front of the right end portion of the rear surface portion 2cb and the inclined surface 2cc.

A notched recess 2e is formed in the upper edge of the left portion of the rear surface 2cb. As shown in Figures 2 to 4, 6, and 7, the recess 2e has a bottom surface 2f, an inclined surface 2g, and a vertical surface 2h.

The bottom surface 2f extends left and right. The inclined surface 2g is connected to the right end of the bottom surface 2f. The inclined surface 2g slopes upward toward the right side. The vertical surface 2h is connected to the left end of the bottom surface 2f and extends upward approximately vertically from the bottom surface 2f. As shown in FIG. 7, the vertical surface 2h extends forward of the bottom surface 2f and is connected to the left side of the rear surface of the front surface portion 2ca.

A guide surface 2k is formed between the front surface 2ca and the rear surface 2cb, extending left and right. The guide surface 2k slopes downward toward the right side. The guide surface 2k is disposed below the upper edge of the front surface 2ca and is approximately parallel to the upper edge of the front surface 2ca. The left end of the guide surface 2k is connected to the front part of the vertical surface 2h.

As shown in FIG. 4, the guide surface 2k is inclined so that the right side is located forward of the left side. That is, the guide surface 2k is inclined downward toward the right side so as to approach the front surface of the front surface portion 2ca. The guide surface 2k extends to the right of the right side of the right side of the front surface portion 2ca and is connected to the lower side of the inclined surface 2cc.

When the position of the vertical surface 2h in the left-right direction, in other words, the circumferential direction of the frame body 200 is the first position P1 and the position of the inclined surface 2cc is the second position P2, the guide surface 2k is formed between the first position P1 and the second position P2 (see FIG. 6). In addition, in the radial direction of the frame body 200, the vertical surface 2h is disposed at the outermost position of the wall 2c, and the lower side of the inclined surface 2cc is disposed at the innermost position of the wall 2c. In other words, the guide surface 2k is formed between the outermost position and the innermost position of the wall 2c. As shown in FIG. 6, the upper right corner of the frame body 200 is curved in an arc shape that protrudes radially outward when viewed from the front, and the guide surface 2k extends in the tangent direction of the arc shape.

To the right of the inclined surface 2cc and to the left of the vertical surface 2h, the wall 2c forms a single wall. That is, the upper portion 20 of the wall 2c has a front portion 2ca and a rear portion 2cb arranged in a front-to-rear direction, forming a double-wall structure, but the other portions of the wall 2c do not form a double structure.

A first chamber 21 that is open radially outward is formed between the rear surface of wall 2c and the front surface of wall 2b. A second chamber 22 that is open radially outward is formed between the front surface of wall 2c and the front side surface 2db of groove 2d. Recess 2e is connected to first chamber 21. Guide surface 2k is connected to recess 2e and second chamber 22. That is, recess 2e and guide surface 2k connect first chamber 21 and second chamber 22 in the front-rear direction. Front surface portion 2ca, rear surface portion 2cb, recess 2e, and guide surface 2k are included in the guide portion.

After the primary coil 5 is attached to the first chamber 21, the winding at the outermost 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, and 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. Because the guide surface 2k is sandwiched between the front surface 2ca and the rear surface 2cb, the winding arranged on the guide surface 2k, i.e., the connection line connecting the two adjacent primary coils 5 and 6, does not come into contact with the primary coil 6. In other words, the connection line is insulated from the primary coil 6.

The difference between the maximum potential of primary coil 5 and the maximum potential of primary coil 6 can be as much as 2000 V in some cases, but as described above, the guide section ensures that the connection wire is insulated from the primary coil 6.

The upper portions of the walls 2a and 2b each have a similar structure, such as the front portion 2ca, the rear portion 2cb, the recess 2e, and the guide surface 2k, but detailed description thereof will be omitted. The connection wire connecting two adjacent primary coils 3 and 4 is insulated from the primary coil 4, and the connection wire connecting two adjacent primary coils 4 and 5 is insulated from the primary coil 5.

The connection wire connecting primary coils 3 and 4 is guided to the bottom surface of groove 2d so as to run along the front surface of wall 2a. The connection wire connecting primary coils 4 and 5 is guided to the bottom surface of groove 2d so as to run along the front surface of wall 2b.

In addition, by forming the front surface 2ca, rear surface 2cb, recess 2e, and guide surface 2k only on the upper portion 20 of the wall 2c, the structure of the guide portion is simplified, making it easier to manufacture the coil bobbin 2 using a mold. Note that the upper portion 20 of the wall 2c is an example of a side portion of the wall 2c that is rectangular when viewed from the front, and the front surface 2ca, rear surface 2cb, recess 2e, and guide surface 2k may be formed on the right, left, or lower portion of the wall 2c.

In the transformer 1 and coil bobbin 2 according to the first embodiment, a guide portion is provided between the first chamber 21 and the second chamber 22, so that the connection wire is not placed 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. Insulation of the connection wire can also be ensured.

The guide portion allows the connection line to be positioned between the front surface 2ca and the rear surface 2cb, ensuring insulation of the connection line. The connection line can also be guided from the first chamber 21 to the second chamber 22 via the recess 2e and the guide surface 2k.

In addition, because the guide portion is formed from the first position P1 in the circumferential direction to the second position P2 distant from the first position P1, the connection wire is gradually guided between the first chamber 21 and the second chamber 22. Therefore, even if the winding is automatically attached using a machine, it is unlikely to fail.

(Embodiment 2)
The present invention will be described below with reference to the drawings showing a transformer 1 according to a second embodiment of the present invention. Among the configurations according to the second embodiment, the same configurations as those in the first embodiment are given the same reference numerals, and detailed description thereof will be 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 sectional view taken along line XII-XII shown in Fig. 10, Fig. 13 is a schematic sectional view taken along line XIII-XIII shown in Fig. 10, Fig. 14 is a schematic sectional view taken along line XIV-XIV shown in Fig. 10, and Fig. 15 is a schematic partial enlarged perspective view of the coil bobbin 2.

A notched recess 2E is formed on the edge of the left portion 23 of the wall 2c. As shown in FIG. 13, the recess 2E is formed in the rear portion of the wall 2c. Hereinafter, the portion of the wall 2c where the recess 2E is formed is referred to as the rear portion 2c2, and the front portion where the recess 2E is not formed is referred to as the front portion 2c1.

As shown in FIG. 12, a guide surface 2c3 is formed from the vertical center of the recess 2E to the upper portion 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 in the front portion of the rear surface portion 2c2 in the left portion 23. The first guide surface 31 extends vertically and is inclined so that the upper portion is located to the right of the lower portion. The first guide surface 31 is disposed between the front surface portion 2c1 and the rear surface portion 2c2.

The second guide surface 32 is formed at the connecting portion between the left portion 23 and the upper portion 20. The second guide surface 32 extends to the left and right, and the left end of the second guide surface 32 is connected to the upper end of the first guide surface 31. The second guide surface 32 is inclined upward as it moves to the right.

The upper portion 20 is connected to the rear surface portion 2c2. An inclined surface 20a is formed in the center of the front surface of the upper portion 20 in the left-right direction. The inclined surface 20a is inclined so that the right side is located forward of the left side. The third guide surface 33 is formed on the upper portion 20. The third guide surface 33 extends left and right, with the left end of the third guide surface 33 connected to the right end of the second guide surface 32, and the right end of the third guide surface 33 connected to the left end of the inclined surface 20a.

The front surface 2c1 is disposed between the lower end of the recess 2E and the left end of the inclined surface 20a, and forms an inverted L shape when viewed from the front. As shown in FIG. 9, the right end of the front surface 2c1 is not connected to the upper portion 20. As shown in FIG. 9, FIG. 14, and FIG. 15, the guide surface 2c3 is formed between the front surface 2c1 and the rear surface 2c2 across the left portion 23 and the upper portion 20, and forms an inverted L shape when viewed from the front.

When the base end position of the first guide surface 31 on the bottom surface of the recess 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 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 Figures 11 and 12). In addition, in the radial direction of the frame body 200, the bottom surface of the recess 2E is located slightly inner than the outermost periphery of the wall 2c, and the right end of the third guide surface 33 is located at the innermost periphery position of the wall 2c. In other words, the guide surface 2c3 is formed between the outermost periphery position and the innermost periphery position of the wall 2c. The front surface 2c1, the rear surface 2c2, the recess 2E, and the guide surface 2c3 are included in the guide section.

Between the first position P1 and the second position P2, the wall 2c has a front portion 2c1 and a rear portion 2c2 that are separated from each other by the guide surface 2c3, i.e., they form a double-wall structure, but other parts of the wall 2c do not form a double structure.

After the primary coil 5 is attached to the first chamber 21, the winding at the outermost position of the primary coil 5 is guided to the second chamber 22 by the recess 2E, the guide surface 2c3, and the inclined surface 20a, and 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. Because the guide surface 2c3 is sandwiched between the front surface 2c1 and the rear surface 2c2, the winding arranged on the guide surface 2c3, i.e., the connecting wire connecting the two adjacent primary coils 5 and 6, does not come into contact with the primary coil 6. In other words, the connecting wire is insulated from the primary coil 6.

The upper portions of the walls 2a and 2b each have a similar structure, such as the front portion 2c1, the rear portion 2c2, the recess 2E, and the guide surface 2c3, but detailed description thereof will be omitted. The connection wire connecting the two adjacent primary coils 3 and 4 is insulated from the primary coil 4, and the connection wire connecting the two primary coils 4 and 5 is insulated from the primary coil 5.

In the transformer according to embodiment 2, a guide portion is formed over the left portion 23 and the upper portion 20 of the wall 2c, and over the first position P1 in the circumferential direction and the second position P2 distant from the first position P1, so that the connection wire is gradually guided between the first chamber 21 and the second chamber 22. Therefore, even if the winding is automatically attached using a machine, it is unlikely to fail.

The upper portion 20 and left portion 23 of the wall 2c are examples of sides of the wall 2c that are rectangular when viewed from the front, and the front portion 2c1, rear portion 2c2, recess 2E, and guide surface 2c3 may be formed across two consecutive sides of the wall 2c. The two consecutive sides are, for example, the left portion and lower portion, the right portion and upper portion, the right portion, or the lower portion. The front portion 2c1, rear portion 2c2, recess 2E, and guide surface 2c3 may be formed across three consecutive sides of the wall 2c. The three consecutive sides are, for example, the right portion, the left portion and upper portion, the right portion, the left portion and lower portion, the upper portion, the lower portion, and the left portion, or the upper portion, the lower portion, and the right portion. The transformer 1 according to the above-mentioned first and second embodiments has a triple coil structure in which secondary coils 8 and 9 are provided on the radially inner and outer sides of the frame body 200, but it may also have a double coil structure in which the secondary coil 9 is provided only on the outer side of the frame body 200, or a double coil structure in which the secondary coil 8 is provided only on the inner side of the frame body 200.

In the above embodiment, four primary coils 3 to 6 are provided, but the number of primary coils may be any number, and two, three, five or more primary coils may be provided.

The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. 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 equivalents to the scope of the claims.

1 Transformer 2 Coil bobbin 2a to 2c Wall 2e, 2E Recess (guide portion)
2k, 2c3 Guide surface (guide portion) 3 to 6 Primary coil (winding) 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 body

Claims (3)

A frame body having an annular shape and a groove formed along an outer periphery thereof;
a wall formed on the inner side of the groove along a circumferential direction and having an annular shape;
a guide portion that is formed between a first chamber that is formed on one side of the wall inside the groove and a second chamber that is formed on the other side of the wall inside the groove and that guides the winding in an insulated state,
The guide portion is
a recess formed in a notch shape on an edge portion of the wall and communicating with the first chamber;
a guide surface that is disposed adjacent to the recess in the axial direction, is between a first position and a second position different from the first position in the circumferential direction, and is formed between an outermost position and an innermost position of the wall, and is connected to the second chamber;
a wall portion disposed adjacent to the guide surface in the axial direction and extending radially outward from a bottom surface of the groove beyond the guide surface;
the recess is formed at the first location;
the guide surface is inclined so as to approach from the outermost peripheral position to the innermost peripheral position as the guide surface approaches from the first position to the second position in the circumferential direction,
a portion of the wall portion extending outwardly from the guide surface has an opposing side that is parallel to the guide surface and faces the guide surface,
When viewed from a radial direction, the guide surface is connected to the recess and the second chamber and is inclined so as to intersect with the wall,
When viewed from the axial direction, the dimension between the opposing edge and the guide surface is constant,
When viewed in the axial direction, the wall has a rectangular shape;
The guide portion is provided on any one side of the wall,
The groove has a rectangular ring shape with four corners curved in an arc shape,
The guide surface extends in a tangential direction of the arc shape and is connected to a corner of the groove. The coil bobbin according to claim 1 , wherein at least a portion of the guide portion is formed inside the wall, between one surface and the other surface of the wall. A frame body having an annular shape and a groove formed along an outer periphery thereof;
a winding wound in the groove;
a wall formed on the inner side of the groove along a circumferential direction and having an annular shape;
a guide portion that is formed between a first chamber that is formed on one side of the wall inside the groove and a second chamber that is formed on the other side of the wall inside the groove and that guides the winding in an insulated state,
The guide portion is
a recess formed in a notch shape on an edge portion of the wall and communicating with the first chamber;
a guide surface that is disposed adjacent to the recess in the axial direction, is between a first position and a second position different from the first position in the circumferential direction, and is formed between an outermost position and an innermost position of the wall, and is connected to the second chamber;
a wall portion disposed adjacent to the guide surface in the axial direction and extending radially outward from the bottom surface of the groove beyond the guide surface;
the recess is formed at the first location;
the guide surface is inclined so as to approach from the outermost peripheral position to the innermost peripheral position as the guide surface approaches from the first position to the second position in the circumferential direction,
a portion of the wall portion extending outwardly from the guide surface has an opposing side that is parallel to the guide surface and faces the guide surface,
When viewed from a radial direction, the guide surface is connected to the recess and the second chamber and is inclined so as to intersect with the wall,
When viewed from the axial direction, the dimension between the opposing edge and the guide surface is constant,
When viewed in the axial direction, the wall has a rectangular shape;
The guide portion is provided on any one side of the wall,
The groove has a rectangular ring shape with four corners curved in an arc shape,
The guide surface extends in a tangential direction of the arc shape and is connected to a corner of the groove.

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