JP2002252123A - Coil device and its fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil device in which a core can be accurately positioned and assembling work is easy, and a fitting structure for the coil device that is superior in heat radiation. SOLUTION: A metal fitting 1 is provided with a bent top plate part 1a, both side plates 1b, a tip end engaging part 1c having a projection 1d, and an intermediate engaging part 1e, that is formed on both sides of the intermediate part of both side plates 1b and is provided with a projection 1f. Cores 2 and 3 are pinched between the tip end engaging part 1c and top plate part 1a in the butting direction, and the butting part 6 is pinched from both sides of the intermediate engaging part 1e. The tip end engaging part 1c is inserted in a recessed part or a hole of a fitting plate, so that the surface of the core 2 and 3 may be adhered to the fitting plate, and a screw is inserted into the fitting hole of a fitting pieces, thereby screwing this coil device on the fitting plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil device such as a choke coil and a transformer formed by combining two cores with metal fittings and a structure for mounting the same on a mounting plate.

[0002]

2. Description of the Related Art FIGS. 6A and 6B are diagrams showing a conventional coil device in which cores 31 and 32 are combined by using a metal fitting 30, which is disclosed in Japanese Utility Model Laid-Open No. 4-70717. is there. The coil device includes a top plate 30a of the metal fitting 30.
A side plate portion 30b is formed at both ends of the side plate portion 30b. The end portion of the side plate portion 30b has a locking piece 30d bent at a right angle. It has a locking piece 30c. This coil device is shown in FIG.
As shown in the figure, the cores 31 and 32 are inserted from the direction of the arrow X and assembled.

FIG. 6C shows another coil device and its mounting structure.
A tape 43 is wound around the periphery of the cores 1 and 42 to be integrated, and the core 4
A substantially U-shaped metal fitting 44 is put on the outside of the first and second metal fittings 42,
The coil device is mounted on the mounting plate 47 by inserting screws 46 into the mounting holes of the mounting pieces 45 at both ends of the mounting plate 47 and screwing into the screw holes of the mounting plate 47.

[0004]

As shown in FIGS. 6A and 6B, in the coil device using the metal fitting 30,
Since one side of the cores 31 and 32 is open, the core 3
In order to integrate the components 1 and 32, the metal fitting 30 and the core 31,
Fixing means such as bonding of the M.32 is required, and there is a problem that the number of steps is increased.

[0005] Further, as shown in FIG.
3 is wound around the cores 41 and 42, the tape 43
Tedious work is required to wind up. Further, since the tape 43 is interposed between the mounting plate 47 and the core 42, there is a problem that heat of the coil device is hardly transmitted to the mounting plate 47 and the heat radiation function is poor.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a coil device in which two cores can be accurately aligned and combined by using only a metal fitting and fixed, and the assembly operation can be easily performed. And

Another object of the present invention is to provide a coil device mounting structure having good heat radiation performance using the coil device.

[0008]

According to a first aspect of the present invention, there is provided a coil device comprising two cores abutting each other, a coil mounted on the core, and a coil mounted on the outside of the core on which the coil is mounted. The bracket is formed of metal having band-like elasticity, and the bracket is formed in a substantially U-shape including a top plate portion and side plate portions bent from both sides thereof, and the top plate portion is located between the top plate portion and the middle plate. Part has a shape protruding between the side plate parts, and has a tip locking part for pressing a core in a butting direction at a front end of each side plate part, and a core on both sides of an intermediate part of each side plate part. And an intermediate locking portion for pressing the butting portion from both sides, and the tip locking portion and the intermediate locking portion have a convex portion for facilitating sliding of the core surface.

As described above, a tip engaging portion for pressing the core in the butting direction is provided at the tip of the substantially U-shaped side plate portion, and the two cores are elastically held between the tip engaging portion and the top plate portion. Thereby, the two cores are combined without a gap in the butting direction, and the core is sandwiched between both side plate portions, and the butting portions of the cores are held by the intermediate locking portions on both sides of the intermediate portion of each side plate portion. Therefore, they are accurately positioned and combined without causing lateral displacement.

Further, since each locking portion has a convex portion for facilitating sliding of the core surface, when the side plate portion is opened and the core is inserted between the side plate portions and between the intermediate locking portions, an intermediate engaging portion is provided. Since the projection of the stop slides on the core surface, the core can be easily inserted between the side plates and between the intermediate locking portions. In addition, when the core surface is pressed against the inner surface of the top plate to extend the top plate from the bent state and simultaneously return the front lock to the original position, the protrusion of the front lock slides on the core surface. Therefore, the return of the distal end locking portion to the original position is also smoothly performed, and the assembling work is easily performed.

According to a second aspect of the present invention, in the first aspect of the present invention, the metal fitting includes a mounting piece having a mounting hole which is bent outward and has a mounting hole at a front end portion of the side plate. The core surface is tightly attached to the mounting plate by accommodating the tip locking portion in a recess or hole provided in the mounting plate, and the coil device is screwed to the mounting plate by a screw inserted through the mounting piece. It is characterized by doing.

As described above, the front end locking portion projecting from the core surface is housed in the hole or the concave portion provided in the mounting plate such as a case or a frame, so that the core surface is mounted in close contact with the mounting plate, whereby the core is mounted. From the coil device to the mounting plate, and the temperature rise of the coil device can be satisfactorily suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1A and 1B show an example of a metal fitting used for a coil device according to the present invention. FIG. 1A is a front view, FIG. 1B is a right side view, and FIG. . The metal fitting 1 is formed in a substantially U-shape from a top plate part 1a and side plate parts 1b and 1b bent from both sides of the band-shaped elastic metal. The top plate portion 1a has a curved shape with an intermediate portion protruding between the side plate portions 1b and 1b.
The distance between the distal ends of the side plate portions 1b and 1b is equal to the top plate portion 1a.
It is formed narrower than the space on the side.

Each of the side plates 1b has a distal end locking portion 1c at the distal end. The distal end locking portion 1c of the present embodiment is formed by bending a plate material on both sides of the distal end of each side plate portion 1b at an acute angle, and as shown in FIG.
In the vicinity of the distal end of the distal end locking portion 1c, a convex portion 1d is formed so as to protrude toward the top plate portion 1a.

As shown in FIGS. 2A and 2B, intermediate locking portions 1e are provided on both sides of the intermediate portion of each side plate portion 1b.
Is bent in a direction protruding in the direction in which the side plates 1b and 1b face each other. In addition, these intermediate locking portions 1e are formed with arc-shaped convex portions 1f protruding inward.

At the center of the tip of each side plate portion 1b,
The mounting pieces 1g are provided by being bent outward at substantially right angles, and each mounting piece 1g is provided with a mounting hole 1h (may be cut).

FIG. 3A is a perspective view showing a coil device constituted by using the metal fitting 1, and FIG. 3B is a front view thereof. In the figure, 2 and 3 are E-shaped cores, 4 is the cores 2 and 3 thereof.
The resin bobbin 5 fitted to the middle legs 2a and 3a is a coil wound around the bobbin 4 and insulated from the cores 2 and 3, and both ends of the coil 5 are not shown. Terminals 5a and 5b for connecting the conductive plate with screws or the like are formed. When the cores 2 and 3 are made of a material having a large electric resistance, the bobbin 4 may not be needed.

At the time of assembling this coil device, FIG.
As shown in (B), the side plates 1b and 1b are opened as shown by the arrow a, and the cores 2 and 3 on which the coil 5 is mounted are moved to the arrow b.
As shown in the figure, the side plate portion 1b is fitted from the front end side. Then, the side legs 2b, 3b of the cores 2, 3 are fitted between the intermediate locking portions 1e, 1e on both sides of each side plate portion 1b. In this case, since the intermediate locking portion 1e has the protrusions 1f projecting toward the cores 2, 3 side, the core surfaces of the cores 2, 3 can slide smoothly and easily while sliding the core surfaces on the protrusions 1f. It can be fitted without damaging the surface.

At this time, the sliding locus on the core surface drawn by the convex portion 1f of the intermediate locking portion 1e is a curve in which the sliding direction changes. In the present embodiment, since the convex portion 1f has an arc shape,
Even if the sliding direction changes, the projection 1f slides smoothly on the core surface.

The end surface of the core 2 reaches the inner surface of the top plate 1a,
When the top plate portion 1a is pressed by the core 2 so as to be straightened from a curved plate shape, the end surface of the core 3 reaches the inside of the distal end locking portion 1c, so that the side plate portions 1b, 1b are connected by the elasticity of the side plate portion 1b. Return to the approaching direction. At this time, since the distal locking portion 1c has the convex portion 1d, the distal locking portion 1c smoothly and easily returns to the end surface of the core 3 without damaging the core surface while sliding on the end surface.

In a state where the cores 2 and 3 on which the coil 5 is mounted by the metal fittings 1 are integrated, the butting portion 6 of the cores 2 and 3 straddles both cores 2 and 3 and the intermediate locking portion 1
3B, the cores 2, 3 in a direction perpendicular to the paper surface in FIG.
Mutual displacement is prevented. Further, the cores 2 and 3 are sandwiched between the side plates 1b and 1b, thereby preventing the paper from shifting in the left-right direction. In addition, the top plate 1a and the tip locking portion 1
Due to the elasticity of c, the cores 2 and 3 are accurately positioned and combined without any gap so as to be pressed against each other in the butting direction.

The protrusion provided on the distal end locking portion 1c is shown in FIG.
As shown in (C), it may be formed in a convex portion 1i that protrudes from the distal end locking portion 1c in a circular or oval shape by pressing. Further, as shown in FIGS. 2C and 2D, the convex portion 1j provided on the intermediate locking portion 1e is configured as two convex portions which are respectively pressed against the cores 2 and 3 butted at the butting portion 6. You may. FIG. 4A is a front view showing a mounting structure of the coil device to the mounting plate 9 using the coil device.
FIG. 4B is a plan view showing a mounting hole structure of the mounting plate 9.

As shown in these figures, the mounting plate 9 for mounting the coil device is provided with a concave portion or a hole 9a as shown in FIG.
, The surface of the core 3 of the coil device is set in close contact with the mounting plate 9. Then, a screw 10 inserted into the mounting hole 1h of the mounting piece 1g is attached to the mounting plate 9
The coil device is screwed to the mounting plate by screwing into a screw hole 9b (may be a nut).

As described above, the front end locking portion 1c protruding from the core surface is accommodated in the hole 9a or the concave portion provided in the mounting plate 9 so that the core surface is mounted in close contact with the mounting plate. When is made of a material such as a metal having good heat dissipation properties, heat can be transmitted well from the core 3 to the mounting plate 9, and a rise in temperature of the coil device can be suppressed.

The contact between the surface of the core 3 and the mounting plate 9 may be performed through a thermally conductive insulating resin such as Sircon (trademark). If such an insulating resin is used, an air layer interposed between the surface of the core 3 and the mounting plate 9 can be eliminated due to the unevenness of the contact surface, so that heat radiation can be further improved and electrical insulation can be performed.

FIGS. 5A and 5B show another embodiment of the coil device of the present invention. The coil device of FIG.
The coil 5 is wound around the bobbin 4 having the bobbin flange / terminal block 11 provided with the terminal 12, and the middle legs 2 a, 3 a of the E-shaped cores 2, 3
(Not shown) is inserted into the cylindrical portion of the bobbin 4, the bobbin 4 is sandwiched by the cores 2 and 3, and the metal fitting 1 is attached from the outside thereof to be integrated.

Also in this embodiment, the sides of the cores 2 and 3 are sandwiched between the side plates 1b and 1b, and both sides of the butting portion 6 are sandwiched between the intermediate locking portions 1e and 1e, and are orthogonal to the butting direction. The top plate portion 1a and the front end locking portion 1
By pressing in the butting direction between the core 2 and the core 2,
3 is combined with the bobbin 4. Reference numeral 11a denotes a stand-off to be mounted on a printed circuit board (not shown), and 1k denotes a projection for removing the metal fitting 1 formed to protrude from the tip of the side plate portion 1b.

The example of FIG. 5A is a vertical type coil device in which a terminal block 11 is provided at the end of the cores 2 and 3 in the butting direction, whereas the coil device of FIG. A terminal block 13 also serving as a bobbin flange is provided on one end face in a direction orthogonal to the butting direction of No. 3, and a terminal 14 is provided on each terminal block 13. Also in this embodiment, the cores 2, 3
Is sandwiched between the side plates 1b and 1b, and both sides of the butting portion 6 are sandwiched between the intermediate locking portions 1e and 1e to prevent displacement in a direction orthogonal to the joining direction. The cores 2 and 3 are combined with the bobbin 4 by pressing in the butting direction between the cores 2 and 3.

In practicing the present invention, the core is E
The present invention can be applied not only to the -E type but also to each type of EI, UU, UI, and EC.

[0030]

According to the first aspect of the present invention, the front end locking portion for pressing the core in the butting direction is provided at the front end of the substantially U-shaped side plate portion.
Since an intermediate locking portion that presses the butting portion of the core from both sides is provided at an intermediate portion of each side plate portion, the cores can be accurately combined. In addition, since each locking portion has a convex portion that facilitates sliding of the core surface, the assembling work is easily performed.

According to the second aspect of the present invention, the front end locking portion protruding from the core surface is housed in the hole or the concave portion provided in the mounting plate, so that the core surface is mounted in close contact with the mounting plate. Heat can be transmitted well to the plate, and the temperature rise of the coil device can be suppressed well.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are a front view, a right side view, and a bottom view, respectively, of a bracket used in a coil device according to the present invention.

2A is a partially enlarged front view of FIG. 1A, and FIG.
5A is a right side view of FIG. 5A, FIG. 5C is a partially enlarged front view showing another example of the fitting of the present invention, and FIG. 5D is a right side view of FIG.

3A is a perspective view showing an embodiment of the coil device of the present invention, and FIG. 3B is a front view thereof.

FIG. 4A is a front view showing a mounting structure of a coil device to a mounting plate using the coil device of the present invention, and FIG. 4B is a plan view showing a mounting hole structure of the mounting plate.

FIGS. 5A and 5B are perspective views each showing another embodiment of the coil device of the present invention.

6A is a perspective view showing a conventional coil device fitting, FIG. 6B is a perspective view showing a coil device using the fitting of FIG. 6A, and FIG. 6C is another conventional coil device and its related components. It is a front view which shows an attachment structure.

[Explanation of symbols]

1: Metal fitting, 1a: Top plate part, 1b: Side plate part, 1c: Tip locking part, 1d: Convex part, 1e: Intermediate lock part, 1f: Convex part, 1
g: mounting piece, 1h: mounting hole, 1i: convex, 1j: convex, 2, 3: core, 4: bobbin, 5: coil, 6: butt, 9: mounting plate, 9a: hole, 9b: Screw holes, 10:
Screws, 11 and 13: Terminal and terminal block, 12 and 14: Terminal

Claims (2)

[Claims] 1. A core comprising two cores which are abutted to each other, a coil mounted on the core, and a metal fitting which is fitted over the outside of the core on which the coil is mounted, and wherein the metal fitting is a belt-shaped metal. By a metal having elasticity, a top plate part,
The top plate portion is formed in a substantially U-shape including side plate portions bent from both sides thereof, and the top plate portion has a shape in which an intermediate portion protrudes between the side plate portions, at a tip of each of the side plate portions, A tip locking portion for pressing the core in the butting direction; and a middle locking portion for pressing the butting portion of the core from both sides on both sides of the middle portion of each of the side plate portions; A coil device, wherein the locking portion has a convex portion that facilitates sliding of the core surface. 2. A mounting structure for a coil device according to claim 1, wherein the metal fitting has a mounting piece having a mounting hole which is bent outward at a front end portion of a side plate portion thereof and has a mounting hole. The surface of the core is brought into close contact with the mounting plate by accommodating the tip locking portion in the provided recess or hole, and the coil device is screwed to the mounting plate with a screw inserted through the mounting piece. The mounting structure of the coil device.