JPH06101409B2 - Transformer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used in various audio equipment, video equipment, industrial equipment, and the like.

Prior Art FIG. 3 shows the structure of a conventional transformer. FIG. 4 is a sectional view of a conventional transformer. A coil 1 is constructed by winding a copper wire around the bobbin 4, the lead wires at both ends of the coil 1 are soldered to the metal pin terminals 5 implanted in the bobbin 4, and the iron core 10 is incorporated and the integrated iron core is inserted. Coil 1 is inserted into a protective case 7 made of an insulating material having an iron core insertion guide wall 8, and then an insulating material 13 such as wax or silicon is cast from the case opening port, and the bottom plate 11 is further opened from the opening port of the protective case 7. This is a transformer that is inserted and fitted.

Problems to be Solved by the Invention This transformer has a structure in which a lead wire 6 is arranged on a metal pin terminal 5 embedded in a lower end collar 2 of a bobbin 4 and soldered. Therefore, when the metal pin terminal 5 moves due to a load or the like, there is a risk that the lead wire 6 will be broken, and the metal pin terminal 5 is required to be robust against the load and particularly have a large pin pushing strength. The pin terminal structure of the bobbin 4 will be described with reference to FIG. The metal pin terminal 5 is provided with crushing a and crushing b in two stages. The crushing a is set so as to hit the lower surface of the lower end flange 2 of the bobbin 4 and the crushing b is set so as to be housed in the lower end flange 2. There is. The metal pin terminal 5 is inserted and penetrated upward from the lower surface of the lower end collar 2 and the pin terminal portion 5a protruding upward is bent to the side surface. The lead wire 6 drawn from the lead drawing groove 12 is wound around the bent pin terminal portion 5a for solder connection. The tensile strength against the metal pin terminal 5 is the bent pin terminal portion 5a.
Can be secured with, and the crushing strength is maintained by crushing a. Furthermore, the horizontal displacement of the bent metal pin terminal 5 is crushed b
It can be held by fitting the pin terminal portion 5a of the metal pin terminal 5 into the pin groove 2a. As described above, the pin push-in strength is particularly problematic in the bobbin 4 having such a form, and the size of the crushing a and the clearance c between the lower surface of the lower end collar 2 of the bobbin 4 and the crushing a greatly influence the pin pressing strength. Exert. Considering the case where the pushing strength is small, the metal pin terminal 5 moves upward due to the load applied to the metal pin terminal 5 and the lead wire 6 soldered to the bent pin terminal portion 5a is pulled upward and is broken. There is a risk that the iron core 10 incorporated in the bobbin 4 and the pin terminal portion 5a come into contact with each other due to the movement of the pin terminal portion 5a or the pin terminal portion 5a moves upward to cause a short circuit, which may cause a fatal defect as a transformer. Therefore, although the pushing strength is guaranteed by controlling the outer diameter of the crushing a and the clearance c between the crushing a and the lower surface of the lower end collar 2 of the bobbin 4, the variation of the crushing a and the variation of the pin hole diameter of the bobbin 4 are ensured. However, the pin pushing strength is large due to variations in the crushing position due to automatic pin insertion, etc. Furthermore, as a problem during the structural process of the transformer, the assembled coil 1 is inserted into the protective case 7, and the insulating material 13 such as wax or silicon is filled therein. After that, the holes provided in the bottom plate 11 are inserted and fitted along with the metal pin terminals 5 embedded in the bobbin 4. At that time, if the metal pin terminals 5 embedded in the bobbin 4 are deformed, the holes in the bottom plate 11 are The metal pin terminals 5 do not coincide with each other, and a heavy load is applied to the metal pin terminals 5 when they are inserted unnecessarily. Further, the insulating material 13 permeates between the pin hole of the lower end flange 2 of the bobbin 4 and the metal pin terminal 5 to improve the slippage, which significantly reduces the push-in strength, and the insertion and inspection of the bottom plate 11 to which the push-in load is applied to the metal pin terminal 5. In the process or in the process of inserting into the printed circuit board by the user, the metal pin terminals 5 move, which causes defects such as disconnection, short circuit, and pin size being too short.

Therefore, according to the present invention, a support wall is provided in the protective case in such a manner that the metal pin terminal embedded in the lower flange of the bobbin penetrates upward and faces the root of the bent portion, and the pushing load is supported by the support wall. By doing so, the push-in strength of the pin terminal can be improved, the quality can be improved, the yield can be improved by reducing the defective rate, the work efficiency can be improved, and the pin embedding size can be reduced to reduce the size of the bobbin. It is intended to provide a transformer.

Means for Solving the Problems A technical means of the present invention for solving the above problems is to provide a support wall so as to face a bent portion of a metal pin terminal embedded in a lower end collar of a bobbin in the protective case. It is provided so that the supporting wall receives the pushing load of the pin.

Operation The effects of this technical means are as follows.

That is, a supporting wall is provided in the protective case so that the metal pin terminal embedded in the lower flange of the bobbin penetrates upward and faces the bent portion, and the pushing load applied to the metal pin terminal of the bobbin by the supporting wall. It has a structure to receive. Even if the bobbin pin push-in strength is weak, the metal pin terminal does not move even if the metal pin terminal is pushed in because the metal pin terminal part of the bobbin and the support wall provided in the protective case are in contact with each other. There are no defects such as a short circuit due to contact with the pin terminal or a lead wire being pulled due to the movement of the metal pin terminal, resulting in disconnection. Also, even if an abnormal load is applied in the process of inserting the bottom pin into the metal pin terminal, the inspection process, or the user process, there is no problem because the load is applied to the support wall provided in the protective case. As described above, according to the present invention, the pin pushing strength of the transformer can be significantly improved, and the quality can be improved, the defective rate can be reduced, and the work efficiency can be improved.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a transformer after assembly according to the present invention. FIG. 2 is a view showing a protective case before assembly according to the present invention. In FIG. 1, reference numeral 14 is a tubular portion of the bobbin 4, and an upper end flange 3 is provided on the upper end outer peripheral portion of the tubular portion 14 and a lower end flange 2 is provided on the opposite lower end outer peripheral portion. This lower flange 2 has a drawing groove
12 and further, a "shaped metal pin terminal 5 is embedded. A copper wire is wound around the bobbin 4 like this.
Then, the iron core 10 is inserted into the tubular portion 14 of the bobbin 4 by soldering. The iron core insertion agent coil 1 thus assembled is inserted into the protective case 7, and the insulating material 13 is cast into the protective case 7.
After that, the bottom plate 11 is inserted through the opening of the protective case 7 along with the metal pin terminal 5 embedded in the bobbin 4, and fitted into the finished product of the transformer. FIG. 1 shows a sectional view thereof. FIG. 2 shows a protective case 7 having a core insertion guide wall 8 and a support wall 9 connected to the guide wall 8 inside.

Next, the configuration of this embodiment will be described. This bobbin 4 has a hole into which the iron core 10 is inserted in the center thereof, and a cylindrical portion 14 around which the coil 1 is wound is provided on the outer periphery thereof. It is configured by providing a lower end flange 2 on the part. The lower end flange 2 has a lead-out groove 12 through which the lead wire of the coil 1 wound around the tubular portion 14 is inserted, and further, the metal pin terminal 5 penetrates from the lower surface of the lower end flange 2 to the upper surface and the protruding portion thereof. Has a pin terminal portion 5a which is bent to the side surface. The lead wire 6 emitted from the coil 1 wound around such a bobbin 4 is wired to the pin terminal portion 5a through the lead-out groove 12 and is soldered and connected. After that, the iron core 10 is inserted inside the tubular portion 14 which is the hole at the center of the bobbin 4. The iron core-inserted coil thus formed is inserted into the protective case 7 as shown in FIG. Inside the protective case 7, a support wall 9 is integrally formed with the protective case 7 at a position facing the bent portion of the metal pin terminal 5 provided on the lower end collar 2 of the bobbin 4. The coil in which the iron core has been inserted is pushed in from the opening of the protective case 7 and inserted. At that time, both end surfaces of the iron core 10 are housed between the left and right support walls 9 provided in the protective case 7, and the case opening opening side (upper side) of the support wall 9 is a metal pin terminal 5 provided on the lower end flange 2 of the bobbin 4. It has a structure that directly hits the bent part.

After that, an insulating material 13 such as wax or silicon is cast from the opening of the protective case 7 to the place where the coil 1 is covered. Then, the holes are aligned with the metal pin terminals 5 provided on the lower end flange 2 of the bobbin 4, the bottom plate 11 is inserted, and the bottom plate 11 is press-fitted into the protective case 7 as it is. After that, hot melt type insulation material such as wax
13 is cooled and the thermosetting insulating material 13 such as silicon is thermoset to complete the transformer.

As described above, according to the present invention, the pin pushing strength of the transformer is significantly increased by bringing the bent portion of the metal pin terminal provided on the lower flange of the bobbin into contact with the support wall provided inside the protective case. improves. There is no fatal defect as a transformer, such as disconnection, short circuit, pin size is too short, etc. in the bottom plate insertion, inspection process, user's assembly process, etc., which is a manufacturing process, and the yield rate is improved by reducing the defect rate. It is possible to improve the work efficiency and further reduce the pin embedded size of the lower end collar of the bobbin, the number of parts is small, the cost is advantageous, and the transformer can be downsized. Further, in manufacturing the bobbin, there is a great merit that the pin crushing diameter, the crushing position and the pin diameter of the molding die are not required to be severely controlled and the productivity is greatly improved. Further, since the iron core can be positioned by the support wall of the protective case, the position of the metal pin terminal with respect to the case becomes constant, and there are many effects such as an improvement in assemblability, which is of great industrial value.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure after assembly of an embodiment of the transformer of the present invention, FIG. 2 is a perspective view of a protective case of the embodiment of the present invention, and FIG. Fig. 4 is a perspective view of the parts, Fig. 4 is a sectional view showing the structure of the conventional transformer after assembly, Fig. 5a,
b is a perspective view and a sectional view of a main part showing the structure of the bobbin used in this transformer. 1 ... Coil, 2 ... Bottom collar, 3 ... Top collar, 4 ... Bobbin, 5 ... Metal pin terminal, 6 ... Lead wire, 7 ... Protective case, 9 ... Support wall, 10 ... Iron core, 11 ... Bottom plate, 13
…… Insulation material, 14 …… Cylindrical part.

Claims (1)

[Claims] 1. A lower end flange of a bobbin having a cylindrical portion having a core through which an iron core is penetrated and a coil wound around the outer periphery, and an upper end flange and a lower end flange are provided on outer peripheral portions of upper and lower ends of the cylindrical portion. Provided with a lead-out groove through which the lead wire drawn from the coil passes, and further, a metal pin terminal is penetrated from the lower surface of the lower end collar to the upper surface of the lower end collar, and the pin terminal portion protruding to the upper surface of the lower end collar is bent to the side surface, A transformer in which a lead wire is solder-connected to a bent portion of the side surface and is incorporated in an insulating protection case provided with a support wall that abuts against the bent portion of the metal pin terminal.