JP3407522B2 - Coil parts - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component used in a power supply circuit of various electronic devices.

[0002]

2. Description of the Related Art A conventional coil component will be described with reference to the choke coil shown in FIGS. First, according to the figure, 1,1a
Is a terminal, 2 and 2a are bobbins to which the terminals 1 and 1a are attached, 3 and 3a are coils wound around the bobbins 2 and 2a, and coils are attached to the bobbins 2 and 2a to which the terminals 1 and 1a are attached. A pair of coil bobbins wound with 3, 3a are combined, the U-shaped magnetic core 5 blocked by the caulking 4 is inserted, the spacer 6 is placed on the magnetic leg of the U-shaped magnetic core 5, and the adhesive 7 is attached. It was made by pouring and inserting the other U-shaped magnetic core 5.

[0003]

However, in the above construction, the U-shaped magnetic core 5 is fixed only by the adhesive force of the adhesive 7 as shown in FIG. , For example, a hardness of 90 barcol or more and a linear expansion coefficient of 3.
It is required to be 5 × 10 ⁻⁵ or less, and it is complicated to hold the U-shaped magnetic core 5 and the U-shaped magnetic core 5 until the adhesive 7 is cured.

Further, as shown in FIG. 8, the caulking is omitted,
When the U-shaped magnetic cores 9 that are stacked one by one without using the blocked magnetic cores are used, the magnetic cores at the ends are depressed like magnetic cores 9a due to the dimensional variation of the spacer 6, and the U-shaped magnetic cores are used. However, there is a problem in that the characteristics of the reactance with respect to the input current are rapidly deteriorated because of approaching to 9.

The present invention is to solve the above-mentioned problems. The U-shaped magnetic core is not blocked, a gap is surely secured without using a spacer, a stable reactance characteristic is obtained, and a U-shaped magnetic core is obtained. (EN) A transformer excellent in productivity, quality, and characteristics, in which a magnetic core is securely fixed and a single laminated magnetic core can be easily produced to realize a low leakage magnetic flux.

[0006]

In order to solve the above-mentioned problems, a coil component of the present invention comprises a pair of coil bobbins having at least a collar portion and a hole into which a magnetic leg is inserted, and between the respective collar portions. Each of the wound coils, the magnetic core formed by inserting the magnetic leg into each of the holes of the pair of coil bobbins, and the magnetic core provided facing the outside of each of the holes of the pair of coil bobbins in the collar portion. A pair of wall portions, and one engaging portion provided on each of the wall portions,
It is configured by an attachment fitting that covers the magnetic core and has the other engaging portion that engages with the one engaging portion and that holds the magnetic core on the pair of coil bobbins.

With the above structure, the magnetic core can be attached to the coil bobbin very easily only by engaging the fitting portion of the wall portion provided on the flange portion of the coil bobbin with the mounting metal fitting.

[0008]

The invention according to claim 1 of the present invention includes a pair of coil bobbins each having a collar portion and a hole into which a magnetic leg is inserted, and each coil bobbin wound between the respective collar portions. Coil, a magnetic core obtained by inserting the magnetic leg into each of the holes of the pair of coil bobbins, and a pair of walls provided on the collar portion facing the outside of the holes of the pair of coil bobbins. A pair of coil bobbins, and one engaging portion provided on each of the walls, and the other engaging portion that covers the magnetic core and engages with the one engaging portion. Because it is configured with a mounting bracket that holds the core,
The magnetic core can be attached to the coil bobbin very easily only by engaging the fitting portion of the wall portion provided on the flange portion of the coil bobbin with the fitting.

According to a second aspect of the invention, in addition to the structure of the first aspect, the magnetic legs are inserted from both sides of the holes of the pair of coil bobbins, and the magnetic core is brought into contact with the flange portion of the coil bobbin. Since the magnetic gap is provided at the abutting portion of the magnetic leg, the magnetic gap can be easily configured by only contacting the magnetic core with the flange portion of the coil bobbin without interposing a spacer, and a coil component useful as a choke coil. Can be provided.

According to a third aspect of the present invention, in addition to the structure according to the first aspect, engaging projections projecting toward the other coil bobbin are provided at the abutting portions of the one coil bobbin with the other coil bobbin. Since the other coil bobbin is provided with an engaging recess that engages with the engaging protrusion, the combination position of the pair of coil bobbins combined is clearly specified, and the insertion of the magnetic core is facilitated. is there.

An embodiment of the present invention will be described below with reference to FIGS. In the description, the same parts as those in the conventional technique are designated by the same reference numerals, and the description will be omitted.

(First Embodiment) FIG. 1 is a side sectional view of a choke coil according to one embodiment, and FIG. 2 is an exploded perspective view of the same.

According to FIG. 1, 1, 1a are coil bobbins 1.
Terminals 11 and 11a are holes provided in the coil bobbins 10 and 10a into which the magnetic legs 13 and 13a of the magnetic cores 12 and 12a are inserted.
Reference numeral a is a wall portion integrated with the flange portions 14 and 14a of the coil bobbins 10 and 10a provided outside the holes 11 and 11a so as to face each other, and 16 and 16a are wall portions 15 and 15a.
Is an engaging hole provided in the.

Reference numerals 17 and 17a denote U-shaped fittings, which are provided with cut-and-raised portions 18 and 18a which engage with the engaging holes 16 and 16a at both ends, and which are slightly curved at both ends. The engaging holes 16 and 16a are provided.
When the cut and raised portions 18 and 18a are engaged with each other, the magnetic cores 12 and 12a mounted on the coil bobbins 10 and 10a are elastically contacted.

The magnetic legs 13, 13 of the magnetic cores 12, 12a
The leg length of a is such that the magnetic cores 12, 12a are coil bobbins 10, 1
0a and the magnetic cores 12 and 12a and the collar portions 14 and 14
It is set so that the magnetic gap a can be formed between the magnetic legs 13 and 13a in the state where a is in contact.

In the choke coil constructed as described above, the magnetic legs 13 and 13a of the magnetic cores 12 and 12a are inserted into the holes 11 and 11a of the coil bobbins 10 and 10a, respectively, and the cut-raised portions 18 of the fittings 17 and 17a are inserted. , 18a to the engagement hole 16,
The magnetic cores 12, 12a can be attached to the coil bobbins 10, 10a simply by engaging with the coil 16a.

Even if the laminated magnetic cores 12 and 12a are used without being caulked, the magnetic gap a is brought into contact with the flange portions 14 and 14a of the coil bobbins 10 and 10a without using a spacer. There is no negative impact on the characteristics.

Further, an adhesive may be applied between the varnish and the magnetic gap a in order to secure the mounting strength and the insulating property of the magnetic cores 12 and 12a. Since 12a is held by the coil bobbins 10 and 10a, it is not necessary to separately hold it and the assembly is easy.

In the above embodiment, the choke coil is provided with the magnetic gap a, but a coil component having an ordinary transformer without the magnetic gap is also included in the scope of the present invention.

Further, the use of silicon steel plates for the fittings 17, 17a makes it possible to reduce the leakage flux.

(Second Embodiment) FIG. 4 is an exploded perspective view of a second embodiment of the present invention, and FIGS. 5 (a) and 5 (b) are top views for explaining a combination of the same pair of coil bobbins. It is a figure.

As shown in FIG. 2, reference numeral 20 denotes a U-shaped engaging protrusion that is directed upward at the corners of both ends of the coil bobbin 21.
Reference numeral 2a is an engaging concave portion into which the engaging protrusion 20 provided on the other coil bobbin 21a is fitted.

As is apparent from the figure, the coil bobbins 21,
21a are provided with the engaging protrusions 20 and 20a, respectively, and engaging recesses 22a and 22 into which the engaging protrusions 20 and 20a are fitted are provided with the coil bobbins 21a and 2a.
Since it is provided in each coil bobbin 2
After the coil 3 is wound around 1, 21a, the engaging projections 20, 20a are slid in the direction of arrow A to engage the engaging recesses 22a, 2a.
Coil bobbins 21, 2
1a can be easily combined as a pair and cannot be removed in a direction other than the B direction, so that the magnetic cores 12 and 12a can be easily inserted, which is effective for mechanical assembly.

Although the differences from the first embodiment have been mainly described, the mounting fittings 17 and 17a are used, and further, the engaging projections 20 and 20a and the engaging recesses 22a,
By fitting 22 together, the strength against separation of the pair of coil bobbins 21, 21a can be improved.

[0025]

As described above, the coil component of the present invention has the one engaging portion provided on the wall portion of the flange portion of the coil bobbin and the other engaging portion engaging with the one engaging portion. Since the magnetic core can be extremely easily attached to the coil bobbin and can hold the coil bobbin in a pair of states by using the mounting bracket, a coil component that can be assembled very easily can be provided.

[Brief description of drawings]

FIG. 1 is a side sectional view of a choke coil which is an embodiment of a coil component of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a perspective view of a mounting bracket and a magnetic core, which are the main parts of the same.

FIG. 4 is an exploded perspective view of another embodiment.

FIG. 5 (a) is a top view for explaining a bobbin fitting method, which is a main part of the same, and FIG. 5 (b) is a top view for explaining the same combination state.

FIG. 6 is an exploded perspective view of a choke coil which is a conventional coil component.

FIG. 7 is a sectional view of the same side.

FIG. 8 is a sectional view of a conventional choke coil that is another coil component.

[Explanation of symbols]

10, 10a, 21, 21a coil bobbins 12,12a magnetic core 13,13a Magnetic leg 14,14a Collar part 15,15a wall 16, 16a Engagement hole 17,17a Mounting bracket 18,18a Cut and raised part 20, 20a engagement protrusion 22, 22a engaging recess

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Kaikaihei 2-114914 (JP, U) Kaikaihei 6-79131 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 27/26 G01F 27/32

Claims (3)

(57) [Claims] 1. A pair of coil bobbins each having at least a collar portion and a hole into which a magnetic leg is inserted, respective coils wound between the respective collar portions, and the respective holes of the pair of coil bobbins. A magnetic core formed by inserting the magnetic legs into a pair, a pair of wall portions provided on the flange portion facing the outside of the respective holes of the pair of coil bobbins, and one provided on each of the wall portions. And a fitting for holding the magnetic core on the pair of coil bobbins, the coil component covering the magnetic core and the other engaging portion that engages with the one engaging portion. 2. The magnetic legs are respectively inserted from both sides of the holes of the pair of coil bobbins, the magnetic core is brought into contact with the flange portion of the coil bobbin, and a magnetic gap is provided at the abutting portion of the magnetic legs. Coil parts. 3. An engaging recessed portion that projects toward the other coil bobbin on both sides of one coil bobbin that abuts on the other coil bobbin, and an engaging recess that engages the engaging projection on the other coil bobbin. The coil component according to claim 1, wherein the coil component is provided.