JPH0897048A - Small transformer - Google Patents

Abstract

PURPOSE: To protect a ferrite core against cracking and to easily clamp the periphery of a unit with a uniform clamping force by a method wherein two U-shaped clamp pieces are used. CONSTITUTION: A first clamp piece 31 is formed like a U-shape composed of a top plate 32 and side plates 33 and 34, wherein bending-pawl insertion holes 38 and 39 are provided to the opposed edges of the top plate 32 close to its joints with the side plates 33 and 34. A second clamp piece 42 is formed like a U-shape composed of a base plate 43 and side plates 44 and 45, wherein bending pawls 47 and 48 are provided to the upper ends of the side plates 44 and 45. The second clamping piece 42 is mounted on a transformer so as to cover the base of a ferrite core and both the sides of a coil. Then, the first clamp piece 31 is mounted so as to cover the top side of the ferrite core and the outsides of the side plates 44 and 45 of the second clamp piece 42 making the bending pawls 47 and 48 protrude from the top plate 32 through the holes 38 and 39, and then the bending pawls 47 and 48 are bent. By this setup, a transformer of this constitution is capable of being clamped with a uniform clamping force protecting a ferrite core against cracking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized transformer for consumer use, and more specifically, a tightening for tightening around a transformer body composed of a coil incorporated in a bobbin and a ferrite core while preventing the ferrite core from cracking. The present invention relates to a small transformer equipped with a fitting.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional small transformer to which the present invention is applied.

The small transformer 1 shown in FIG. 5 has a bobbin 2
And a coil 6 and a ferrite core 7. The bobbin 2 has a flange 3 on one side in the axial direction OO ′, and the flange on the opposite side has a thick portion 4, and a plurality of pins 5 are provided on the thick portion 4 of the flange. It has been planted. The coil 6 is wound around the winding body of the bobbin 2. The ferrite core 7 is incorporated in the bobbin 2 so as to surround the coil 6. The small transformer 1 is attached to a printed circuit board (not shown) via the pin 5 and used.

Next, FIG. 6 shows a conventional tightening metal fitting used for tightening a small transformer, and FIG. 7 shows a process of a conventional tightening method performed using the tightening metal fitting.

In the prior art, a tightening metal fitting 10 as shown in FIG. 6 is used. The tightening metal fitting 10 includes a first tightening metal fitting 11 having a substantially U-shape and a second tightening metal fitting attached to an opening portion thereof.
The fastening metal fitting 21 is provided.

That is, the first fastening member 11 is formed into a substantially U shape having a top plate 12 and side plates 13 and 14, and a mounting piece 15 and a bending claw which are provided as necessary. 19 and 20. The mounting piece 15 does not have to be special. Bending pieces 1 are provided on both sides of the top plate 12 in the width direction.
6 is attached, and each bent piece 16 is bent to the end side of the top plate 12. Bending pieces 17 are provided on both sides of one side plate 13 in the width direction, and each bending piece 17 is bent to the end side of the side plate 13. Bending pieces 18 are also provided on both sides of the other side plate 14 in the width direction, and each bending piece 18 is bent to the end side of the side plate 14. The attachment piece 15 is attached to the lower ends of the side plates 13 and 14 and is bent outside the side plates 13 and 14.
The one bent claw 19 is provided so as to project from the lower end portion of each bent piece 17 provided on the one side plate 13. The other bent claw 20
Are protrudingly provided at the lower end of each bent piece 18 provided on the other side plate 14.

The second fastening member 21 has a bottom plate 22 and notches 24 and 25. Bent pieces 23 are provided on both sides of the bottom plate 22 in the width direction.
Reference numeral 3 is bent toward the wife side of the bottom plate 22. One notch 24 is formed in a U shape on both sides in the width direction of the bottom plate 22 near one end in the length direction of the bottom plate 22, and is adapted to receive the bending claw 19. There is. The other notch 25 is formed in a U shape on both sides in the width direction of the bottom plate 22 near the other end in the lengthwise direction of the bottom plate 22 so as to receive the bending claw 20. There is.

In the prior art shown in FIGS. 6 and 7, the coil 6 and the ferrite core 7 are arranged in the axial direction O of the unit.
-The first tightening metal fittings 1 on both sides
1 and put the bottom plate 22 of the second tightening metal fitting 21 on the bottom surface of the unit of the coil 6 and the ferrite core 7, and the first tightening to the notches 24 and 25 formed in the second tightening metal fitting 21. The bending claws 19 and 20 provided on the metal fitting 11 are inserted, and the bending claws 19 and 20 are inserted into the coil 6 and the ferrite core 7 on the unit side surface 4 of the thick portion 4 of the flange of the bobbin 2 of the small transformer 1. It is designed to be bent inward with respect to each other in a plane perpendicular to ′.

[0009]

However, as can be seen from FIG. 7 in the prior art, the bending claws 19 and 20 on the thick wall portion 4 side of the flange of the bobbin 2 of the small transformer 1 are very difficult to bend, There is a problem that it is difficult to evenly tighten the outer circumferences of the coil 6 and the ferrite core 7 units.

Further, when the coil 6 and the ferrite core 7 are tightened by the tightening metal fitting 10, if the shock is applied, the ferrite core is fragile, so that the ferrite core 7 may be cracked.

In order to prevent the above-mentioned cracking of the ferrite core 7 and to make it easier to bend the bent claws 19 and 20 of the tightening metal fitting 10, a conventional method has been devised in which the tightening metal fitting 10 is made of a brass plate. However, if the fastening metal fitting 10 is made of a brass plate, there is a problem in that the cost is increased.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent the ferrite core from cracking and to easily apply a uniform tightening force to the outer circumference of the coil and ferrite core units. An object of the present invention is to provide a small transformer that can be tightened and that can reduce the cost.

[0013]

In order to achieve the above-mentioned object, the present invention has a top plate 32 and side plates 33 and 34, and is formed in a substantially inverted U-shape and both side plates 33 and 34 of the top plate 32.
The first fastening member 31 having the insertion holes 38 and 39 for the bent claws formed at the end edge on the side, and the bottom plate 43 and the side plates 44 and 45 are formed in a substantially inverted U-shape and the side plates 44. , 45 with a second fastening member 42 provided with bent claws 47, 48 at the upper end portions thereof, and the second fastening is provided so as to surround both side surfaces of the coil 6 from the bottom surface of the ferrite core 7 of the small transformer 1. Attach the metal fitting 42, and attach the upper surface of the ferrite core 7 of the small transformer 1 and the second
The first fastening metal fitting 31 is mounted so as to surround the outsides of both side plates 44 and 45 of the fastening metal fitting 42, and the top plate 32 of the first fastening metal fitting 31 is mounted.
Bending claws 47, 48 provided on the side plates 44, 45 of the second tightening fitting 42 through the insertion holes 38, 39 formed in
So that it can be bent on the upper surface of the top plate 32 in a plane parallel to the unit side surface 4'of the coil 6 and the ferrite core 7 in the thick portion 4 of the flange of the bobbin 2 of the small transformer 1. In this structure, the bent claws 47 and 48 are projected and bent to tighten the unit of the coil 6 and the ferrite core 7.

[0014]

In the present invention, the fastening fitting 30 having the first fastening fitting 31 and the second fastening fitting 42 is used.

The first fastening member 31 includes a top plate 32, both side plates 33 and 34, and both side plates 33 and 34 of the top plate 32.
It has insertion holes 38 and 39 for bent claws formed in the edge portion on the side.

The second tightening member 42 includes a bottom plate 43, both side plates 44 and 45, and bending claws 47 and 4 provided at the upper ends.
8 and.

In order to tighten the coil 6 and the ferrite core 7 unit of the small transformer 1 by using the tightening fitting 30, the bottom surface of the ferrite core 7 of the small transformer 1 and both side surfaces of the coil 6 are surrounded. As described above, the second tightening member 42 is attached. In addition, the upper surface of the ferrite core 7 of the small transformer 1 and the side plates 44, 45 of the second tightening fitting 42.
Both side plates 44, 45 of the second tightening fitting 42 surrounding the outside of the
Bending claws 47 and 48 provided on the upper end of the coil are projected through the through holes 38 and 39 formed in the top plate 32 of the first tightening fitting 31, and the coil 6 and the ferrite core 7 of the small transformer 1 are projected.
The first fastening fitting 31 is attached to the outside of the unit and the second fastening fitting 42.

In this state, it is provided on the upper ends of the side plates 44 and 45 of the second tightening metal fitting 42 and the first tightening metal fitting 31.
The bending claws 47 and 48 protruding from the insertion holes 38 and 39 formed in the top plate 32 of the
The bobbin 2 of the small transformer 1 is arranged at a position where it can be bent in a plane parallel to the unit side surface 4'of the coil 6 and the ferrite core 7 in the thick portion 4 of the flange. From this state, the bending claws 47 and 48 are bent by pulling the first and second fastening fittings 31 and 42 toward each other.

As described above, in the present invention, the first tightening fitting 31
Is arranged on the upper surface of the top plate 32 of the small transformer 1 in a position parallel to the unit side surface 4'of the coil 6 and the ferrite core 7 in the thick wall portion 4 of the flange of the bobbin 2 of the small transformer 1. Therefore, the bent claws 47, 4 are not disturbed by the thick portion 4 of the flange of the bobbin 2 of the small transformer 1.
8 can be folded. As a result, (1) it is possible to tighten the coil 6 of the small transformer 1 and the unit of the ferrite core 7 by the tightening metal fitting 30 without giving an impact, so that the ferrite core 7 can be tightened while being prevented from cracking, (2) The outer circumference of the coil 6 and the ferrite core 7 unit can be tightened with a uniform tightening force,
(3) Since it is not necessary to form the fastening metal fitting 30 with an expensive brass plate and an inexpensive iron plate or the like can be used, cost reduction can be achieved.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of a fastening metal fitting used in the present invention, FIG. 2 is a side view showing the fastening process of the outer periphery of a coil and ferrite core unit in the present invention, and FIGS. 3 and 4 are respectively. It is explanatory drawing of the bending direction of the bending nail | claw in this invention.

First, the object of the present invention is the small transformer 1 having the structure shown in FIG. 5 and described above.

And in this embodiment of the method of the present invention, FIG.
The tightening fitting 30 shown in is used. The tightening fitting 30 is
A first fastening fitting 31 and a second fastening fitting 42 are provided.

The first fastening member 31 has a top plate 32 and side plates 33 and 34, and is formed in a substantially inverted U-shape. Further, the first fastening member 31 has a through hole 3 for the bent claw.
8, 39 and locking projections 40, 41 are provided.

Bending pieces 35 are provided on both sides of the top plate 32 in the width direction, and each bending piece 35 is bent to the wife side of the top plate 32.

Bending pieces 36 are provided on both sides of one side plate 33 in the width direction, and each bending piece 36 is bent to the end side of the side plate 33. Bending pieces 37 are also provided on both sides in the width direction of the other side plate 34, and these bending pieces 37 are also bent to the end side of the side plate 34.

The bending claw insertion holes 38, 39 are formed by punching out the center portion of the top plate 32 on the side plates 33, 34 side in the width direction. The locking projections 40 are provided so as to project from the lower ends of the bent pieces 36 provided on both sides of the one side plate 33 in the width direction. The locking projections 41 are provided so as to project from the lower ends of the bent pieces 37 provided on both sides of the other side plate 34 in the width direction. It should be noted that the side plates 33, 34 may have mounting pieces formed in the middle of the vertical direction or at the lower ends thereof, if necessary.

The second fastening member 42 has a bottom plate 43 and both side plates 44 and 45, and is formed in a substantially inverted U-shape. Further, the second fastening member 42 has bent claws 47, 48.
And notches 49 and 50 are provided.

Bending pieces 46 are provided on both sides of the bottom plate 43 in the width direction, and each bending piece 46 is bent to the end side of the bottom plate 43.

The side plates 44 and 45 are provided with the first fastening fitting 31.
It is formed so as to overlap the inside of the side plates 33 and 34.

Of the bending claws 47 and 48, one bending claw 47 is provided at the upper end of one side plate 44 at the center of the side plate 44 in the width direction. The other bent claw 48
Is provided on the upper end portion of the other side plate 45 at the central portion in the width direction of the side plate 45.

In order to tighten the coil 6 of the small transformer 1 and the unit of the ferrite core 7 by using the tightening fitting 30, the bottom surface of the ferrite core 7 of the small transformer 1 and both side surfaces of the coil 6 are surrounded. Then, the second fastening member 42 is mounted. Further, the first tightening metal fitting 31 is mounted so as to surround the upper surface of the ferrite core 7 of the same small transformer 1 and the outsides of both side plates 44 and 45 of the second tightening metal fitting 42. At this time,
Bending claws 47, 48 provided on the upper ends of both side plates 44, 45 of the second tightening metal fitting 42 are inserted into the insertion holes 38, 39 formed in the top plate 32 of the first tightening metal fitting 31, and projected. Further, in the notches 49 and 50 formed on the bottom plate 43 of the second tightening metal fitting 42, the projections 40 provided on the lower ends of the bent pieces 36 and 37 of the side plates 33 and 34 of the first tightening metal fitting 31. , 41
And the phases of the first and second tightening metal fittings 31, 42 are matched.

In this state, the upper and lower side plates 44 and 45 of the second fastening member 42 are provided at the central portions of the side plates 44 and 45, and the side plates 33 and 33 of the top plate 32 of the first fastening member 31. At the edge portion on the 34 side, the bent claws 47, 48 protruding from the insertion holes 38, 39 formed in the central portion of the top plate 32 in the width direction are provided on the upper surface of the top plate 32.
The coil 6 and the ferrite core 7 in the thick wall portion 4 of the flange of the bobbin 2 of the small transformer 1 are arranged in a plane parallel to the unit side surface 4 '.

From this state, the first and second tightening fittings 31,
The bending claws 47 and 48 are bent after the 42 is pulled toward each other. The folding claws 47 and 48 may be bent inward as shown in FIG. 3, or may be bent outward as shown in FIG.

As described above, the bending claw 4 is used in this embodiment.
7 and 48 can be bent on the upper surface of the top plate 32 in a plane parallel to the unit side surface 4 ′ of the coil 6 and the ferrite core 7 in the thick portion 4 of the flange of the bobbin 2 of the small transformer 1. Since it is projected, as can be seen from FIG. 2, the bending claws 47 and 48 can be bent without being obstructed by the thick portion 4 of the flange of the bobbin 2 of the small transformer 1. As a result, the tightening fitting 30 allows the coil 6 of the small transformer 1 and the unit of the ferrite core 7 to be tightened without giving an impact.
Can be tightened while preventing cracking, the outer circumference of the coil 6 and the ferrite core 7 unit can be tightened with a uniform tightening force, and the bending claws 47 and 48 can be tightened without being disturbed by other members. Since it can be bent easily, the fastening metal 30 can be made of an inexpensive material such as an iron plate in place of an expensive brass plate to reduce the cost.

[0036]

As described above, according to the present invention, the top plate 32 and the side plates 33 and 34 are formed in a substantially inverted U-shape and are folded at the edge portions of the top plate 32 on the side plates 33 and 34 side. A first tightening fitting 31 having insertion holes 38 and 39 for bending claws, and a bottom plate 4
3 and two side plates 44, 45, which are formed in a substantially inverted U-shape, and are provided with a second tightening member 42 provided with bent claws 47, 48 at the upper end portions of the side plates 44, 45. The second tightening metal fitting 42 is mounted so as to surround both side surfaces of the coil 6 from the bottom surface of the ferrite core 7 of the transformer 1, and the upper surface of the ferrite core 7 of the small transformer 1 and both side plates of the second tightening metal fitting 42. Four
Insertion holes 3 formed in the top plate 32 of the first fastening metal fitting 31 by mounting the first fastening metal fitting 31 so as to surround the outer sides of 4, 45.
8, 39 through the side plates 44, 45 of the second tightening fitting 42.
On the upper surface of the top plate 32, the bending claws 47, 48 provided on the coil plate 6 and the ferrite core 7 on the unit side surface 4 ′ of the coil 6 in the thick portion 4 of the flange of the bobbin 2 of the small transformer 1 are parallel to each other. So that it can be bent in a plane,
Since the bending claws 47 and 48 are bent and the unit of the coil 6 and the ferrite core 7 is tightened, the bending claws 47 and 48 are not disturbed by the thick portion 4 of the flange of the bobbin 2 of the small transformer 1. As a result of being able to fold 48,
(1) Since the coil 6 of the small transformer 1 and the unit of the ferrite core 7 can be tightened without giving an impact by the tightening metal fitting 30, there is an effect that the ferrite core 7 can be tightened while being prevented from cracking. ) There is an effect that the outer circumference of the unit of the coil 6 and the ferrite core 7 can be tightened with a uniform tightening force, and (3) it is not necessary to make the tightening fitting 30 with an expensive brass plate, and an inexpensive iron plate or the like can be used. Therefore, there is an effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a tightening fitting used in the present invention.

FIG. 2 is a side view showing a process of tightening the outer circumference of a unit of a coil and a ferrite core according to the present invention.

FIG. 3 is an explanatory diagram showing an example of a bending direction of a bending claw according to the present invention.

FIG. 4 is an explanatory view showing another example of the bending direction of the bending claw in the present invention.

FIG. 5 is a structural explanatory view of a small transformer.

FIG. 6 is a perspective view of a tightening fitting used in a conventional technique.

FIG. 7 is a side view showing a tightening process in the prior art.

[Explanation of symbols]

1 small transformer 2 bobbin 3 flange 4 thick part of flange 4'plane of coil and ferrite core unit side in thick part of flange 5 pin 6 coil 7 ferrite core OO 'axial direction of small transformer 30 tightening Fitting 31 First fastening fitting 32 Top plate 33, 34 Side plate 38, 39 Insertion hole for bending claw 42 Second fastening fitting 43 Bottom plate 44, 45 Side plate 47, 48 Bending claw

Claims (1)

[Claims] 1. A bobbin 2 having a flange 3 on one side and a thick wall portion 4 of the flange in which a plurality of pins 5 are planted on the other side, a coil 6 wound around this bobbin 2, and this coil. In a small-sized transformer 1 composed of a ferrite core 7 surrounding 6 and a side plate 3 of the top plate 32, which is formed in a substantially inverted U shape having a top plate 32 and side plates 33 and 34.
First tightening metal fitting 31 having insertion holes 38 and 39 for bending claws formed at the edge portions on the side of 3, 34, a bottom plate 43, and both side plates 44 and 4.
5, which are formed in a substantially inverted U-shape and have side plates 44,
The second tightening metal fitting 42 having the bent claws 47 and 48 is provided at the upper end of 45, and the ferrite core 7 of the small transformer 1 is provided.
The second tightening metal fitting 42 is attached so as to surround both side surfaces of the coil 6 from the bottom surface of the ferrite core 7 of the small transformer 1.
The first fastening metal fitting 31 so as to surround the upper surface of the second fastening metal fitting 42 and the outsides of both side plates 44 and 45 of the second fastening metal fitting 42.
Through the insertion holes 38 and 39 formed in the top plate 32 of 1.
The bent claws 47 and 48 provided on the side plates 44 and 45 of the second tightening metal fitting 42 are provided on the upper surface of the top plate 32 to form the coil 6 in the thick portion 4 of the flange of the bobbin 2 of the small transformer 1.
And the bending claws 47, 48 are projected so that they can be bent in a plane parallel to the unit side surface 4'of the ferrite core 7.
A small transformer characterized in that the coil 6 and the ferrite core 7 are tightened and the unit is tightened.