JP2000150244A - Choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a choke coil with no possibility of damages to or drop of a terminal, for simplifying a terminal mounting constitution, and for simplifying the whole assembly work. SOLUTION: This chock coil is provided with a ring core 1, having a round hole on whose upper edge part a notch 11 is formed, and a cylindrical coil 30 constituted by winding a coil around a coil core part 22 of a drum core 2, and a tube 6 made of insulating materials, and a U-shaped terminal 4 formed of a bent terminal part 40, rising part 43, and bending restraining part 44. Also, the cylindrical coil 30 is fit through the tube 6 made of insulating materials into the round hole of the ring core 1, and the U-shaped terminal 4 is engaged elastically with the notch 11 and the lower edge of the ring core 1.

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 does not cause the terminals to be damaged or falls off, has a simplified terminal mounting structure, and facilitates the entire assembling operation.

[0002]

2. Description of the Related Art A conventional example of an SMD choke coil will be described with reference to FIGS. FIG. 4A is a perspective view of the SMD choke coil, and FIG. 4B is a view showing a cross section taken along line bb ′ in FIG. 4A. FIG. 5 is an exploded perspective view of the SMD choke coil of FIG.

In FIGS. 4 and 5, 1 is a ring core, 2 is a drum core, 3 is a winding, and 4 is a terminal. These ring core 1 and 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 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, referring to FIG. 5B, the terminal 4 is bonded and fixed to the surface of the one flange portion 21 of the drum core 2 via the terminal core fixing portion 41 with an epoxy resin adhesive. 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. Then, FIG.
Referring to FIG. 5C, the winding 3 is wound around the core 22 of the drum core 2 configured as shown in FIG. 5B. And
The ends of both windings of the winding 3 are lumped to the lump solder portion 42 of the terminal 4. In a state where the winding ends of the windings 3 are lumped to the lump solder portion 42 of the terminal 4, reflow soldering is performed on the lump solder portion 42 to completely electrically and mechanically connect the terminal 4 and the winding 3.

[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]

Here, reference numeral 5 denotes a gap between the ring core 1 and the coil 30 composed of the drum core 2 and the winding 3. The gap 5 is filled with a thermosetting adhesive filler, which is heated and cured, and the assembly of the entire choke coil is completed. The problem is that the terminal 4 is bonded and fixed to the surface of the one flange portion 21 of the drum core 2 with an epoxy resin-based adhesive via the terminal core fixing portion 41. This bonding and fixing is performed by thermosetting adhesive. The filler is damaged by heating during heat curing.

Further, it is difficult to join and fix the core fixing portion 41 of the terminal 4 to the surface of the one flange portion 21 of the drum core 2. That is, it is necessary to pay close attention to the management and adjustment of the amount of the applied adhesive, and it takes a long time to adjust the amount of the applied adhesive. In addition, if a difference in the amount of the adhesive applied occurs, a great difference occurs in the joining strength of the product and the long-term stability of the joining.

Further, since the above-mentioned choke coil does not have a centering structure and does not necessarily employ a special centering process in the manufacturing process, eccentricity may occur in a finished product. Is big. Further, since the manufacturing process includes a bonding step using an adhesive and a heat-curing step of a thermosetting adhesive filler, the total manufacturing operation time is relatively long.

[0010] The present invention provides a choke coil that solves the above-mentioned problems.

[0011]

Means for Solving the Problems Claims 1: A ring core 1 having a round hole 10 and a notch 11 formed at an upper end portion is provided, and a winding wire 3 is wound around a core portion 22 of a drum core 2. Comprising a cylindrical coil 30 configured, comprising a tube 6 made of an insulating material, comprising a U-shaped terminal 4 ′ comprising a bent terminal portion 40, a rising portion 43 and a bent engagement portion 44,
A cylindrical coil 30 was fitted into the round hole 10 of the ring core 1 via the tube 6 made of an insulating material, and a choke coil was formed in which the U-shaped terminal 4 ′ was elastically engaged with the notch 11 and the lower end of the ring core 1.

[0012] Claim 2: In the choke coil described in claim 1, the ring core 1 has a lateral cross-sectional rectangular shape on the outer surface thereof. Claim 3: In the choke coil described in any one of claims 1 and 2, the drum core 2 is a core portion that connects the upper flange portion and the lower flange portion 21 to both the flange portions. 22 was formed.

[0013] Claim 4: Claims 1 to 3
In the choke coil described in any one of the above, the tube 6 made of an insulating material constituted a choke coil made of an insulating material mixed with a magnetic material powder. Also,
Claim 5: In the choke coil according to any one of claims 1 to 4, the U-shaped terminal 4 'further has a carrage solder portion 42, and connects and folds the winding 3 of the coil 30. A curved choke coil was constructed.

[0014]

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 the assembled choke coil, and FIG.
FIG. 2 is a diagram showing a vertical cross section along line bb in FIG. 2A is a diagram showing the assembled choke coil as viewed from above, FIG. 2B is a diagram showing the lower side of the choke coil, and FIG. 2B is a diagram showing the choke coil. It is a figure which shows the place seen from the bottom.

The outer surface of the ring core 1 has a rectangular cross section in the transverse direction, and the inner surface has a circular cross section in the transverse direction. A notch 11 is formed at the upper end of the ring core 1. The drum core 2 includes an upper and lower flange 21 and a core 22. The drum core 2 is wound around a core portion 22 with a winding 3, and the coil 3
0 is formed. Reference numeral 4 'denotes a U-shaped terminal, which includes a bent terminal portion 40, a caraage solder portion 42, a rising portion 43, and a bent engagement portion 44. Reference numeral 6 denotes a tube made of an insulating material.
The insulating material tube 6 has a uniform thickness and is interposed between the ring core 1 and the drum core 2. As this insulating material tube 6,
In particular, an insulating material tube mixed with a magnetic material powder can be used. The U-shaped terminal 4 ′ is
When the tube 6 made of an insulating material and the drum core 2 are fitted into the circular hole 10 of the ring core 1, the cutout 11 formed at the upper end of the ring core 1 and the lower ends of the ring core 1 and the drum core 2 are elastically formed. Strongly adhered. That is, the U-shaped terminal 4 ′ is formed on the lower portion of the ring-shaped terminal 4 ′ while the rising portion 43 is elastically deformed while the bent engagement portion 44 formed on the upper portion is engaged with the notch 11 of the ring core 1. The bent terminal portion 40 is elastically attached by pushing the bent terminal portion 40 into the lower end of the ring core 1. The ring core 1 and the drum core 2 described above can be made of ferrite.

Referring to FIG. 3, a method of assembling the choke coil will be described. Here, referring to FIG. 3A, this is where the coil 30 is formed in the drum core 2, and the end of the winding 3 is pressed into the temporary fixing groove 212 of the lower flange portion 21 to temporarily fix the winding 3. Is shown. Referring to FIG. 3 (b), this fixes the winding end portion 31 of the winding 3 by applying an adhesive.
The state where the completed coil 30 is fitted to the insulating material tube 6 is shown. Next, the process proceeds to a drying step with the coil 30 fitted in the tube 6 made of insulating material.

Referring to FIG. 3C, this corresponds to FIG.
An assembly of the coil 30 and the tube 6 made of an insulating material after the step (b) is completed and the adhesive of the winding end portion 31 is solidified is shown. As shown in FIG. 3D, the assembly of the coil 30 and the tube 6 made of an insulating material is fitted into the circular hole 10 of the ring core 1, and the leading end 33 of the winding 3 is temporarily fixed to the groove 212 and the ring core 1 Then, the U-shaped terminal 4 'is elastically attached and fixed to the ring core 1 as described above.

Referring to FIG. 3 (e), this shows a state in which the lead-out terminal 33 of the winding wire 3 is carved on the carage solder portion 42 of the U-shaped terminal 4 'attached and fixed to the ring core 1. Referring to FIG. 3 (f), this shows a state where the lead-out terminal 33 of the winding 3 is soldered 45 to the carrage solder part 42. Referring to FIG. 3 (g), this shows a state in which the drawer terminal 33 bends the carrage solder portion 42 to which the solder 45 has been soldered 45 so as to approach the side of the ring core 1 to reduce the outer dimensions of the choke coil. .

[0019]

As described above, according to the present invention, since the U-shaped terminal is elastically and strongly attached to the ring core and fixed, there is no danger that the terminal will be damaged and fall off. And the structure of terminal attachment is simplified and the assembling work is facilitated. Further, since the tube made of an insulating material having a constant thickness of the tube itself is interposed between the drum core and the ring core, the center axis between the drum core and the ring core can be easily and precisely aligned.

Furthermore, as a tube made of an insulating material,
By using a tube made of an insulating material mixed with a magnetic material powder, a choke coil exhibiting high inductance characteristics can be easily formed.

[Brief description of the drawings]

FIG. 1 illustrates an embodiment.

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

FIG. 3 is a view for explaining how to assemble the embodiment.

FIG. 4 is a diagram illustrating a conventional example.

FIG. 5 is an exploded perspective view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring core 10 Round hole 11 Notch 12 Plane part 13 Arc surface part 14 Groove 2 Drum core 21 Flange part 211 Flat part 212 Temporary fixing groove 22 Core part 3 Winding 30 Coil 31 Winding end part 33 Pull-out terminal 4 Terminal 4 ′ U-shaped Terminal 40 Bent terminal part 41 Terminal core fixing part 42 Caraage solder part 43 Rising part 44 Bend engaging part 45 Soldering 6 Tube made of insulating material

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[Procedure amendment]

[Submission date] December 28, 1999 (1999.12.
28)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 37/00 H01F 15/10 F

Claims (5)

[Claims] 1. A tube made of an insulating material, comprising: a ring core having a round hole, a notch formed in an upper end portion; a cylindrical coil formed by winding a winding wire around a core portion of a drum core; A U-shaped terminal comprising a bent terminal portion, a rising portion, and a bent engagement portion, and a cylindrical coil is fitted into a round hole of a ring core through a tube made of an insulating material to form a U-shape. A choke coil in which a terminal is elastically engaged with a notch and a lower end of a ring core. 2. The choke coil according to claim 1, wherein the outer surface of the ring core has a rectangular cross section in a transverse direction. 3. The choke coil according to claim 1, wherein the drum core comprises an upper flange portion, a lower flange portion, and a winding core portion connecting the both flange portions. A choke coil characterized by the following. 4. The choke coil according to claim 1, wherein the tube made of an insulating material is made of an insulating material mixed with a magnetic material powder. . 5. The choke coil according to claim 1, wherein the U-shaped terminal further has a carrage solder portion, and the winding of the coil is connected and bent. Characteristic choke coil.