JP2020047653A - Coil component and bobbin - Google Patents

Abstract

To provide a coil component capable of easily temporally stopping a core in an assembly step, and to provide a bobbin.SOLUTION: In a coil component 1a, a coil is formed by a winding wire wound to a bobbin 4 with a vertical direction as a winding axis 100 direction assuming that three directions of the vertical direction, a cross direction, and a longitudinal direction are orthogonal each other. The coil is arranged in a magnetic path formed by a core 2 mounted to the bobbin. The core is formed by oppositely arranging two core members 21a and 21b having a middle leg 22 in the vertical direction. The bobbin comprises: a hollow cylindrical winding axis part 49 having a hollow part 45 into which the middle leg is inserted; and wall parts 43 and 44 which are opposite in the cross direction on both vertical ends. In at least one of the wall parts opposite in the cross direction, a claw 47 engaging an upper end surface and a lower end surface of the core are formed at a surface on the opposite side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coil component having a divisible core and a bobbin.

  Some coil components include an N-turn multilayer wound coil. 1A and 1B show an example of a conventional coil component 101 including a multilayer wound coil. FIG. 1A is a perspective view showing the appearance of the coil component 101, and FIG. 1B is a perspective view when the coil component 101 is disassembled for each component. As shown in FIG. 1A, the coil component 101 includes a multilayer wound coil 3 disposed in a magnetic path formed by a core 2 via a bobbin 104 that is an integrally molded insulating resin. In FIG. 1B, the coil 3 is omitted and the coil component 101 is shown for simplicity.

  Here, it is assumed that the three coordinate axis directions in the three-dimensional orthogonal coordinate system are defined as the up-down direction, the front-rear direction, and the left-right direction, respectively, and that the winding axis 100 direction of the coil 3 is defined as the up-down direction. As shown in FIG. 1A, the coil component 101 has a multilayer wound coil 3 arranged in a closed magnetic path formed by a core 2 in which two core members (21a, 21b) are vertically opposed to each other. . The conductor forming the coil 3 is wound around the bobbin 104, and the two core members (21a, 21b) hold the bobbin 104 from above and below. On the lower surface of the bobbin 104, a plurality of mounting lead terminals 46 protruding downward are provided. Further, the two core members (21a, 21b) are fixed by, for example, a tape 24 wound one or more turns along the outer circumference so as not to separate from each other.

  As shown in FIG. 1B, the bobbin 104 is formed integrally with a hollow cylindrical winding shaft portion 49 around which a conductive wire is wound, above a base portion 48 on which the lead terminals 46 are implanted. The core 2 is an EER type in which two E-type core members (21a, 21b) each having a columnar middle leg 22 are vertically opposed to each other. Then, the middle legs 22 of the two core members (21 a, 21 b) are inserted into the hollow portion 45 of the bobbin 49.

  A flange 41 is formed at the upper end of the winding shaft 49. Here, when the core members (21a, 21b) define the left-right direction as the outer legs are formed on the left and right of the middle leg 22, the upper surface of the flange 41 has a flat plate shape with the front-rear direction as a normal direction. Are formed symmetrically with respect to the opening of the hollow portion 45. When the middle leg 22 of the upper core member 21a is inserted into the hollow portion 45, the core member 21a is held by the two wall portions 43 in the front-rear direction. Thereby, rotation about the center leg 22 of the core member 21a is regulated.

  The lower end surface of the base portion 48 of the bobbin 104 is formed in a groove shape along the outer shape of the lower core member 21b, and the wall surface 44 of the groove faces the hollow portion 45 in the front-rear direction. When the middle leg 22 of the lower core member 21b is inserted into the hollow portion 45 of the winding shaft portion 49, the lower core member 21b is moved to the wall surface of the groove formed on the lower end side of the base portion 48 (hereinafter, also referred to as the lower wall portion 44). ), The rotation around the middle leg 22 is restricted in the same manner as the upper core member 21a. In the coil component 101 in an assembled state, the two core members (21a, 21b) are bonded to the bobbin 104. Further, as described above, the tape 24 is attached to the outer leg, and the two core members (21a, 21b) are reinforced so as not to be separated.

  Patent Document 1 below describes a coil component having a dividable core 2, a material and a manufacturing method of the coil component 101, and the like. Further, Non-Patent Document 1 below describes the outer shape and dimensions of a commercially available coil component.

JP 2017-195293 A

FDK Corporation, "Trans", [online], [Search on August 28, 2018], Internet <URL: http://www.fdk.co.jp/cyber-j/coil/transformer.html>

  In the conventional coil component 101 shown in FIGS. 1A and 1B, two core members (21a, 21b) and the bobbin 104, or outer legs of the two core members (21a, 21b) are bonded to each other. Then, the worker who assembles the coil component 101 needs to keep the two assembled core members (21a, 21b) by hand until the adhesive is hardened to some extent. Further, when assembling the core members (21a, 21b) to the bobbin 104, the worker applies an adhesive to the core 2 and the bobbin 104, then inclines the posture of the coil component 101, and adheres the adhesive while flowing the adhesive. In some cases, the work is performed to spread the information evenly over the location. Further, since there is a clearance between the members, it is necessary to assemble the core 2 with the bobbin 104 and then align the bobbin 104 with the core 2 so that the core 2 is disposed symmetrically. Thus, in the conventional coil component 101, when assembling the core 2 and the bobbin 104, it was necessary to perform complicated various operations in parallel with the temporary fixing operation for holding the core 2. Such a complicated operation lowers the yield of the coil component 101 and hinders a reduction in manufacturing cost.

  Therefore, an object of the present invention is to provide a coil component and a bobbin capable of easily temporarily fixing a core in an assembly process.

One embodiment of the present invention for achieving the above object has three directions perpendicular to each other as a vertical direction, a front-rear direction, and a left-right direction,
A coil component in which a coil wound vertically around the bobbin is formed by the winding wound around the bobbin, and the coil is disposed in a magnetic path formed by a core mounted on the bobbin. So,
The core is configured such that two core members each having a middle leg are vertically opposed to each other,
The bobbin includes a hollow cylindrical winding shaft portion having a hollow portion through which the middle leg is inserted, and a wall portion facing the front and rear ends at upper and lower ends,
At least one of the wall portions facing in the front-rear direction has a claw that locks an upper end surface and a lower end surface of the core on a surface on the facing side,
It is a coil component characterized by the above.

According to another aspect of the present invention, three directions perpendicular to each other are respectively defined as a vertical direction, a front-rear direction, and a left-right direction, and a vertical direction is formed in a magnetic path formed by a core in which two core members each having a middle leg are arranged to face each other. A bobbin provided with a coil component in which a coil whose direction is a winding axis is arranged,
A winding part around which the winding of the coil is wound around the outer periphery, a hollow part through which the middle leg of the core member is inserted, and a wall part facing the front and rear ends at both upper and lower ends. ,
At least one of the wall portions facing in the front-rear direction has a claw that locks an upper end surface and a lower end surface of the core on a surface on the facing side,
The bobbin is characterized in that:

  According to the present invention, a coil component and a bobbin that can easily temporarily fix a core in an assembly process are provided.

It is a figure showing appearance of a conventional coil part. It is a disassembled perspective view of the said conventional coil component. FIG. 2 is an exploded perspective view of the coil component according to the embodiment of the present invention. FIG. 6 is an exploded perspective view of a coil component according to another embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings used in the following description, the same or similar parts are denoted by the same reference numerals, and redundant description may be omitted. In addition, depending on the drawings, unnecessary reference numerals may be omitted in the description.

=== Example ===
As described above, in the conventional coil component 101 as shown in FIGS. 1A and 1B, in the assembling process, the two core members (21 a, 21 b) are temporarily held together by hand, while It was necessary to perform complicated work at the same time. Therefore, the coil component according to the embodiment of the present invention is provided with a structure for eliminating the need for a manual temporary fixing step.

  FIG. 2 shows a coil component 1a according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the coil component 1a when viewed from above, with the coil 3 omitted. As shown in FIG. 2, the basic configuration of the coil component 1a according to the embodiment is the same as the conventional general coil component 101 shown in FIGS. 1A and 1B. That is, the coil component 1 a includes the EER-type core 2 and the bobbin 4 having the terminal 46. The bobbin 4 integrally includes a base 48 and a winding shaft 49, and an upper wall 43 and a lower wall 44 supporting the core members (21 a, 21 b) are formed on the flange 41 and the base 48, respectively. Have been.

  Here, in the coil component 1a according to the embodiment of the present invention, claws 47 for temporarily fixing the core 2 are formed on the upper wall 43 and the lower wall 44 of the bobbin. Schematically, two claws 47 are provided on the upper edge of the surface facing each other (hereinafter, also referred to as the inner surface) and the lower edges of the inner surfaces of the two left and right lower walls 44 in the front and rear two upper walls 43. It is formed left and right apart.

  Further, the lower surface of the claw 47 of the upper wall 43 and the upper surface of the claw 47 of the lower wall 44 are surfaces having the vertical direction as a normal line (hereinafter also referred to as a horizontal plane). The upper surface of the claw 47 of the upper wall 43 and the lower surface of the claw 47 of the lower wall 44 are tapered surfaces that incline downward and inward in the front-rear direction. Therefore, for example, when the upper core member 21a is assembled from the upper side to the lower side with respect to the bobbin 4, the upper wall 43 provided with the claws 47 is bent outward while the core member 21a is The space is guided to a space between the cores 43 (hereinafter, also referred to as a core assembly area). When the upper surface of the core member 21 a reaches the lower surface of the claw 47, the upper wall 43 that has been bent is restored, and the upper surface of the core member 21 a is locked by the claw 47. Similarly, when assembling the lower core member 21b upward from below, the core member 21b is locked by the claw 47 provided on the lower wall 44. As a result, the two core members (21a, 21b) assembled from above and below to the bobbin 4 are held in a state where they are opposed to each other. That is, the core 2 is maintained in a state of being temporarily fixed to the bobbin 4 without being held by hand. Therefore, in the assembling process of the coil component 1, the work of inclining the posture of the coil component 1 a to flow the adhesive and the operation of aligning the core 2 and the bobbin 4, which are performed simultaneously with the temporary fixing, are facilitated.

=== Other Embodiments ===
The description of the embodiments described above is for facilitating the understanding of the present invention, and does not limit the technical scope of the present invention. The present invention can be modified and improved without departing from the spirit of the above embodiments, and the present invention includes equivalents thereof.

  The coil component 1a in the above embodiment is a so-called vertical coil component 1a in which the direction in which the lead terminals 46 protrude is parallel to the direction of the winding shaft 100 of the coil 3, but according to an embodiment of the present invention. The coil component may be a so-called horizontal coil component in which the direction in which the lead terminals 46 protrude is perpendicular to the direction of the winding axis 100 of the coil. Therefore, as a coil component according to another embodiment, a horizontal coil component will be described. FIG. 3 shows an example of a coil component 1b according to another embodiment. FIG. 3 is a perspective view when the coil component 1b is disassembled into components, and FIG. 3 also shows the coil component 1b with the coil omitted.

  Here, three directions orthogonal to each other are referred to as a vertical direction, a front-back direction, and a left-right direction, respectively. Then, while defining each direction with the direction of the winding shaft 100 of the coil 3b as the vertical direction, the bobbin 4b defines the front and rear directions as the winding shaft portion 49b is formed in front of the base 48b. In the coil component 1b according to another embodiment, as shown in FIG. 3, a plurality of mounting lead terminals 46 protrude rearward from the rear surfaces of the upper and lower ends of the bobbin 4b. The hollow portion 45 into which the middle leg 22 of the core 2b is inserted is open at both upper and lower ends of the winding shaft portion 49b. The core 2b of the coil component 1b shown here has two core members 21 each having a middle leg 22 having an elliptical cross section, which are vertically opposed to each other.

  Flanges 41b are formed at both upper and lower ends of the winding shaft portion 49b. The rear end side of the flange 41b is integrated with the base 48. On the front end side of the flange 41b of the winding shaft portion 49b, a flat wall portion 43b whose normal direction is the front-rear direction is formed so as to protrude vertically and outwardly. The upper and lower ends of the base 48b project vertically and outwardly with respect to the flange 41b, and the front end face of the base 48b serves as a wall supporting the rear end face of the core 2b. That is, the core member 21 is disposed between the wall 43b formed on the flange 41b at the upper and lower ends of the bobbin 4b and the front surface of the base 48b.

  In the base portion 48b, two claws 47b protruding forward are formed on the upper edge and the rear edge of the front surface of the region that functions as a wall portion that protrudes upward and rearward from the flange 41, respectively, and that are separated from each other. I have. In the coil component 1b according to another embodiment, the core 2 is disposed between the front surface of the base portion 48b and the rear surface of the wall portion 43b, and the rear ends of the upper and lower end surfaces of the core 2 are engaged with the claws 47b. Is done. Thereby, the movement of the core 2 in the vertical direction is restricted. That is, even in the horizontal coil component 1b shown in FIG. 3, the core 2 can be temporarily fixed to the bobbin 4b.

  In the coil component 1 according to the embodiment, the number, arrangement, size, and shape of the claws 47 formed on the bobbin 4 can be appropriately set as long as the cores 2 can be prevented from falling off. For example, wide claws may be formed in the center in the left-right direction of the upper region on the inner side surfaces of the left and right upper walls 43 of the bobbin 4 and the lower region on the inner side surfaces of the left and right lower walls 44, respectively. .

  Although the coil component 1 according to the above embodiment has been described as including the EER-type core 2, the coil component 1 may have a dividable core, and the core according to the embodiment of the present invention may be, for example, The coil may be a UU type in which a coil for N turns is wound around one leg via a bobbin shaft portion.

1, 1a, 1b, 101 Coil parts, 2, 2b core, 3, 3b coil, 4, 4b, 104 bobbin, 21, 21a, 21b core member, 22 middle leg, 24 tape, 41, 41b flange, 43 upper wall , 43b wall,
44 lower wall, 45 hollow part, 46 lead terminal, 47, 47b claw, 48, 48b base, 49, 49b reel part, 100 reel

Claims (2)

The three directions perpendicular to each other are the up-down direction, the front-back direction,
A coil component in which a coil wound vertically around the bobbin is formed by the winding wound around the bobbin, and the coil is disposed in a magnetic path formed by a core mounted on the bobbin. So,
The core is configured such that two core members each having a middle leg are vertically opposed to each other,
The bobbin includes a hollow cylindrical winding shaft portion having a hollow portion through which the middle leg is inserted, and a wall portion facing the front and rear ends at upper and lower ends,
At least one of the wall portions facing in the front-rear direction has a claw that locks an upper end surface and a lower end surface of the core on a surface on the facing side,
A coil component characterized by the above. A coil having a vertical axis as a winding axis is formed in a magnetic path formed by a core formed by two core members each having a middle leg facing each other, with three directions orthogonal to each other as a vertical direction, a front-rear direction, and a horizontal direction. A bobbin provided with a coil component arranged,
A winding part around which the winding of the coil is wound around the outer periphery, a hollow part through which the middle leg of the core member is inserted, and a wall part facing the front and rear ends at both upper and lower ends. ,
At least one of the wall portions facing in the front-rear direction has a claw that locks an upper end surface and a lower end surface of the core on a surface on the facing side,
A bobbin characterized by that

Images