JP3009883B1 - choke coil - Google Patents

Abstract

An object of the present invention is to provide a choke coil that can easily assemble a terminal without fear of the terminal being damaged or falling off. SOLUTION: A coil 80 formed by winding a winding wire 8 around a rod-shaped core 7 is provided, and a short magnetoresistance adjusting tube 72 is fitted and attached to both core ends 71, and a lower box-shaped core is provided. And a box-shaped core 6 comprising a box-shaped core 68 and an upper box-shaped core 69. The box-shaped core 6 is partitioned by a partition 63, and each compartment 681 of the box-shaped core has a core end at an open end of both side walls 60 thereof. Core receiving notch 61 into which the portion 71 is fitted and positioned
Are formed to face each other, and terminal insertion slits 6 formed near the side wall 60 at the bottom wall corners of the compartments 681 and 682.
4 comprising a winding connection portion 91, a rising portion 93, and a terminal portion 92 connecting the both.
A choke coil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a choke coil, and more particularly, to a choke coil which has no risk of terminal breakage and falling off, has a simplified terminal mounting structure, and can be easily assembled.

[0002]

2. Description of the Related Art A conventional example of a surface mount choke coil is shown in FIG.
This will be described with reference to FIG. FIG. 3A is a perspective view of a surface mount choke coil, and FIG.
It is a figure which shows the cross section along line bb 'in (a). FIG. 4 is an exploded perspective view of the surface mount choke coil of FIG.

In FIGS. 3 and 4, reference numeral 1 denotes a ring core, 2 denotes a drum core, 3 denotes a winding, and 4 denotes a terminal. The ring core 1 and the drum core 2 are made of ferrite which is an electrically insulating material. A pair of flat portions 12 facing each other is formed on a part of the side surface of the ring core 1. A notch 11 is formed at the lower end of the arcuate surface portion 13 which is opposed to the pair of flat surface portions 12 and is adjacent to the pair of flat surface portions 12.

The drum core 2 includes a pair of flanges 21 and a winding core 22 which is integrally connected to the two flanges 21 to connect the two. A pair of flat portions 211 facing each other is formed in a part of the both flange portions 21. The coil 3 is wound around the core portion 22 of the drum core 2 to form the coil 30. The terminal 4 has a cut-and-raised piece formed as a terminal core fixing portion 41 in the center thereof. One end of the terminal 4 is slightly bent in the same plane from the terminal main body to form a caraque solder portion 42, and the other end is bent at a right angle to form a rising portion 43.

The above-described ring core 1, drum core 2, winding 3 and terminal 4 are manufactured and prepared. Here, FIG.
Referring to (b), the terminal 4 is bonded and fixed to the surface of one flange 21 of the drum core 2 via a terminal core fixing portion 41 with a thermosetting adhesive such as epoxy resin. In this case, the rising portions 43 of the terminals 4 are opposed to the flat portions 211 of the both flange portions 21 of the drum core 2 and are jointed and fixed in parallel with each other. Next, referring to FIG. 4C, the winding 3 is wound around the core 22 of the drum core 2 configured as shown in FIG. 4B. Then, both ends of the winding 3 are lapped to the lump solder portion 42 of the terminal 4. Carrage solder part 42 of terminal 4
In the state where the winding ends of the windings 3 are luggaged, the terminal 4 and the windings 3 are completely electrically and mechanically connected by performing reflow soldering on the lump solder portion 42.

[0006] The ring core 1 is fitted to the drum core 2, the windings 3, and the terminals 4 assembled as described above.
When fitting the ring core 1, the notch 11 at the lower end of the arcuate surface portion 13 of the ring core 1 is opposed to the carrage solder portion 42, and the lower end of the flat portion 12 is parallel to each other so as to correspond to the rising portion 43 of the terminal 4. I do. The soldering portion 42 of the terminal 4 is bent after soldering,
The notch 11 is formed by the bent carrage solder portion 42.
Constitute an accommodation area.

[0007]

The above-described choke coil requires a step of joining and fixing the terminal 4 to the core 2 with a thermosetting adhesive via the core fixing portion 41, and is simple. It is not something that can be fixed and fixed, and there is a possibility that the terminal may be damaged and fall off. In addition, one coil 80 is formed in one box-shaped core 6. When a choke coil of the same type or the same type is formed, naturally, a corresponding number of parts is required. Also, when configuring the same type or the same type of choke coils, when they are mounted on a circuit board, the amount of work also corresponds to the number, and the mounting area on the circuit board also corresponds to the number.

SUMMARY OF THE INVENTION The present invention provides a choke coil which eliminates the above-described problem of simplifying the assembling work by simplifying the terminal mounting structure without the risk of the terminal being damaged and falling off.

[0009]

A coil 80 is formed by winding a winding wire 8 around a rod-shaped core 7, and both ends 71 of the rod-shaped core 7 have a magnetoresistive adjusting short tube 7.
2 is fitted and attached, and comprises a box core 6 formed by abutting open ends of a lower box core 68 having an opening and an upper box core 69 having an opening. The box-shaped core 6 is divided into a plurality of compartments 681 by the partition 63, and each compartment 681 of the lower box-shaped core 68 and the upper box-shaped core 69 is provided at an open end of both side walls 60. Core receiving notches 61, into which the core ends 71 of the rod-shaped cores 7 are fitted and positioned, are formed facing each other,
A terminal insertion slit 64 formed near the side wall 60 is provided at a corner of the bottom wall of each of the compartments 681 and 682.
1 and a rising portion 93, and a terminal portion 9 for connecting the both.
A choke coil having a U-shaped cross-sectional terminal 9 was formed.

Claim 2: In the choke coil described in claim 1, the number of faces of the partition 63 of the box-shaped core 6 is one or two or more. Claim 3: In the choke coil according to any one of claims 1 and 2, each of the coils 80 constitutes a choke coil having electric characteristics equal to or different from each other. .

Further, in the choke coil according to the present invention, the short tube 72 for adjusting the magnetic resistance of each of the coils 80 constitutes a choke coil having different thicknesses and / or magnetic characteristics.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a perspective view of an embodiment of a choke coil, and FIG. 1B is a view showing a cross section taken along line bb ′ in FIG. 1A. FIG. 2 is an exploded perspective view of the choke coil of FIG. 1, and FIG.
2 is a perspective view of the outside of the box-shaped core, FIG. 2B is a perspective view of the coil, and FIG. 2C is a perspective view of the inside of the box-shaped core and the U-shaped terminal.

In FIGS. 1 and 2, reference numeral 6 denotes a box-shaped core. Here, the box-shaped core 6 is formed by butt-joining the lower box-shaped core 68 having an opening and the opening end of the upper box-shaped core 69 having an opening configured similarly. In the embodiment shown, the lower box core 68 and the upper box core 69 have the same shape and structure. 7 is a rod-shaped core, and 8 is a winding. The magnetoresistive adjusting short tube 72 is fitted and attached to both core end portions 71 of the rod-shaped core 7, and the winding 8 is formed of a large portion of the rod-shaped core 7 to which the short tube 72 is not fitted and attached. The coil 80 is formed by being wound around an intermediate portion occupying the portion. As the rod-shaped core 7, a round rod core is illustrated and described. Reference numeral 9 denotes a U-shaped cross-section terminal, which includes a winding connection portion 91 and a rising portion 9.
3 and a terminal portion 92 connecting these two. The box-shaped core 6 and the rod-shaped core 7 are made of ferrite which is an electrically insulating magnetic material.

In particular, referring to FIG. 2C, the lower box core 68 and the upper box core 69 constituting the box core 6 have parallel side walls 60 facing each other. The partition 63 is formed between the middle portions of the opposing parallel side walls 60, and the compartment 681 and the compartment 682 are formed.
Is divided into two. At both upper ends of the side walls 60 of the lower box-shaped core 68, core receiving notches 61 into which the core ends 71 of the rod-shaped cores 7 are fitted and positioned in both the compartments 681 and 682. Are formed opposite to each other. The same applies to the upper box-shaped core 69 serving as a lid, and core receiving cutouts 61 in which the core ends 71 of the rod-shaped cores 7 are fitted and positioned are formed at the lower ends of both side walls 60 so as to face each other. Have been. Reference numeral 64 denotes a terminal insertion slit, which is formed near the side wall 60 at the corner of the bottom wall of the compartment 681 and the compartment 682.

To assemble the above components to form a choke coil in which a plurality of coils 80 are accommodated in one box-shaped core 6, first, the compartment 681 of the lower box-shaped core 68 is formed.
In addition, the winding connection portion 91 of the U-shaped terminal 9 is inserted into the terminal insertion slit 64 formed in the compartment 682, and the side wall 60 is elastically sandwiched between the terminal connection slit 91 and the rising portion 93. The mold terminal 9 is pressed and fixed. As a result, the terminal portion 92 of the U-shaped terminal 9 is located on the lower surface of the bottom wall of the lower box-shaped core 68 to form a surface-mounted choke coil terminal. Next, the rod-shaped core 7 of the coil 80 is inserted into the core receiving notch 61 of each of the compartments 681 and 682.
End 7 into which the short tube 72 for adjusting magnetic resistance is fitted
1 is positioned and fixed. Here, the terminal portion of the winding 8 of the coil 80 is connected to the winding connection portion 91 by soldering.
Finally, the opening end of the upper box-shaped core 69 abuts against the opening end of the lower box-shaped core 68, and the core receiving notch 6
1 is joined to the core end 71 of the rod-shaped core 7 while being positioned, and the assembly of the choke coil is completed.

In the above choke coil, as shown in FIG. 1A, the rod-shaped cores 7 are formed to have the same diameter as each other, and the winding 8
Can be used as a choke coil in which two identical coils 80 wound in the same manner are accommodated in one box-shaped core 6. Then, as shown in FIG. 1 (b), a choke in which the rod-shaped cores 7 are configured to have different diameters and two different coils 80 obtained by winding the windings 8 different times is accommodated in one box-shaped core 6. It can be a coil. In each of the above choke coils, two coils 80 are accommodated in one box-shaped core 6, but the number of accommodated coils can be generally plural. In order to construct a choke coil in which a plurality of coils are accommodated in one box-shaped core 6, the number of compartments is increased by increasing the number of partitions 63 corresponding to the number of accommodated coils. Attach the terminal 9 and fix it.

[0017]

As described above, the choke coil of the present invention has a
By inserting the winding connecting portion 91 of the above and pressing and fixing the U-shaped terminal 9 in a state where the side wall 60 is elastically held between the winding connecting portion 91 and the rising portion 93, without using an adhesive. It is very easy to elastically connect the U-shaped terminal 9 to the lower box-shaped core 68.

A plurality of coils 80 are formed in one box-shaped core 6. This makes it possible to greatly reduce the number of components used to configure the same number of coils 80 as compared to a case where the plurality of coils 80 are independently configured separately, which is convenient for the procurement management of components. is there.
The fact that the plurality of coils 80 are integrated in one box-shaped core 6 also means that the work efficiency is improved when the coils are mounted on a circuit board, and the mounting area on the circuit board is increased. Also shrink.

Further, the choke coil of the present invention has a lower box constituting a magnetic path of the choke coil, in which the magnetic resistance adjusting short tubes 72 are fitted to both core ends 71 of the rod-shaped core 7 of the coil 80. The rod-shaped core 7, which also forms a magnetic path, with both the mold core 68 and the upper box-shaped core 69.
The magnetic resistance adjusting short tube 72 is interposed in the core receiving notch 61 between the core end 71 and the core end 71.
Here, the magnetic resistance of the magnetic path of the choke coil can be adjusted by changing and adjusting the thickness and magnetic characteristics of the magnetic resistance adjustment short tube 72. In the case of a surface-mount type choke coil, the DC superposition characteristics of the coil may vary depending on the mounting mode.
The control and adjustment can be easily performed by changing and adjusting the thickness and the magnetic characteristics of No. 2.

[Brief description of the drawings]

FIG. 1 illustrates an embodiment.

FIG. 2 is a diagram illustrating an outer surface of the embodiment.

FIG. 3 illustrates a conventional example.

FIG. 4 is an exploded perspective view of a conventional example.

[Explanation of symbols]

 Reference Signs List 6 box core 60 side wall 61 core receiving cutout 63 partition wall 64 terminal insertion slit 68 lower box core 681 partition 682 partition 69 upper box core 7 rod core 71 core end 72 short magnetic resistance adjusting tube Reference Signs List 8 winding 80 coil 9 U-shaped cross section terminal 91 winding connection section 92 terminal section 93 rising section

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ Identification code FI H01F 37/00 H01F 37/00 FN27 / 24H (56) References Real open Flat 3-113809 (JP, U) Real open 1983-116219 (JP, U) Japanese Utility Model 5-55,515 (JP, U)

Claims (4)

(57) [Claims] 1. A rod comprising a coil formed by winding a winding around a rod-shaped core, a short resistance tube for adjusting magnetic resistance is fitted and attached to both core ends of the rod-shaped core, and a lower side having an opening. A box core constituted by abutting the open ends of an upper box core having an opening and an upper box core having an opening, and these box cores are partitioned into a plurality of compartments by partition walls, In each of the compartments of the box-shaped core and the upper box-shaped core, core receiving cutouts in which the core ends of the rod-shaped cores are fitted and positioned at the open ends of both side walls are formed so as to face each other. A terminal insertion slit formed near the side wall at the corner of the bottom wall of the compartment; and a U-shaped cross-sectional terminal comprising a winding connection part, a rising part, and a terminal part connecting these two parts. A choke coil. 2. The choke coil according to claim 1, wherein the number of surfaces of the partition walls of the box-shaped core is one or two or more. 3. The choke coil according to claim 1, wherein each of the coils has electric characteristics equal to or different from each other. . 4. The choke coil according to claim 3, wherein the short tubes of each coil have different thicknesses and / or magnetic properties.