JPS6218015A - Transformer - Google Patents

Abstract

PURPOSE:To contrive to improve the pin push-in strength of a transformer and its quality of by a method wherein supporting walls are provided in the protective case in opposition to the bending parts of the metallic pin terminals embedded in the lower end flanges of the bobbin, and the pin push-in load is received by the supporting walls. CONSTITUTION:Supporting walls 9 integrally molded with a protective case 7 are provided inside the protective case 7 at the places to oppose to the bending parts of metallic pin terminals 5 provided in the lower end flanges 2 of a bobbin 4. When the core-insertion finished coil is pushed in and inserted in the protective case 7 from its opening, both end surfaces of a core 10 are housed between the left and right supporting walls 9 provided in the protective case 7. The case opening sides of the supporting walls 9 are directly abutted on the bending parts of the metallic pin terminals 5 provided in the lower end flanges 2 of the bobbin 4. By this constitution, the pin push-in strength of the transformer is significantly improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 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. Further, FIG. 4 shows a sectional view of a conventional transformer. Copper wire is wound around the bobbin 4 to form the coil 1, and the lead wires at both ends of the coil 1 are soldered to the metal pin terminals 6 planted in the bobbin 4, and the iron core 1o is integrated into the integrated iron core. The coil 1 is inserted into a protective case 7 having a core insertion guide wall 8, then an insulating material 13 such as wax or silicone is cast through the opening of the case, and the bottom plate 11 is inserted and fitted through the opening of the protective case 7. It is a transformer.

Problems to be Solved by the Invention This transformer has a structure in which a lead wire 6 is connected by wire soldering to a metal pin terminal 6 embedded in the lower end collar 2 of the bobbin 4.

Therefore, if the metal pin terminal 5 moves due to a load or the like, there is a risk of wire breakage, and the metal pin terminal 5 is required to be strong against the load and, in particular, to have a high pin pushing strength. The pin terminal structure of the bobbin 4 will be explained using FIG. 5. The metal pin terminal 5 is provided with crush & and crush b in two stages, the crush a is set to contact the lower surface of the bobbin lower end flange 2, and the crush b is set to be housed in the lower end flange 2. Such a metal pin terminal 5 is inserted and penetrated above the lower surface of the lower end collar 2, and the pin terminal portion 5a that protrudes upward is bent to the side surface. The bent pin terminal part 5
The structure is such that the lead wire 6 pulled out from the lead pull-out groove 12 is wound around a and connected by soldering. The tensile strength for the metal pin terminal 6 can be ensured by the bent pin terminal portion 5a,
In addition, the indentation strength is maintained at crush a. Further, the horizontal deviation of the bent metal pin terminal 6 is caused by the crushing b and the pin groove 2a.
It can be held by fitting the pin terminal portion 5a of the metal pin terminal 6 into the metal pin terminal 6. As mentioned above, the pin pushing strength of this type of bobbin 4 is particularly problematic, and the size of the crushing part A and the clearance C between the lower surface of the lower end collar 2 of the bobbin 4 and the crushing a have a large influence on the pin pushing strength. affect If we consider a case where the push-in 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 e soldered to the bent pin terminal portion 5a is pulled upward and becomes disconnected. If the pin terminal portion 5a moves upward, the iron core 10 assembled in the bobbin 4 and the pin terminal portion 6a may come into contact with each other, causing a short circuit, which may cause a fatal defect in the transformer. Therefore, the pushing strength is currently guaranteed by controlling the outer diameter of the crusher a and the clearance C between the crusher a and the lower surface of the lower end flange 2 of the bobbin 4, but variations in the crusher a and variations in the pin hole diameter of the bobbin 4 However, due to variations in the crushing position due to automatic pin insertion, the pin pushing strength was large and varied. Furthermore, as a problem during the transformer manufacturing process, the assembled coil 1 is inserted into a protective case, and an insulating material 13 such as wax or silicone is filled therein. After that, the hole provided in the bottom plate 11 is aligned with the metal pin terminal 5 embedded in the bobbin 4 and inserted and fitted, but if the metal pin terminal 6 embedded in the bobbin 4 is deformed at that time, the hole in the bottom plate 11 The metal pin terminal 6 does not match,
When the metal pin terminal 6 is forcibly inserted, a large load is applied to the metal pin terminal 6, and furthermore, the insulating material 13 penetrates between the pin hole in the lower end collar 2 of the bobbin 4 and the metal pin terminal 5, which increases slippage and significantly reduces the push-in strength. This causes the metal pin terminals 6 to move during the insertion of the bottom plate 11, which applies a pushing load to the metal pin terminals 6, the inspection process, or the user's printed circuit board insertion process, which can cause defects such as disconnection, short circuits, and short pin dimensions. Ta. Therefore, in the present invention, a support wall is provided in the protective case in a shape that passes through the metal pin terminal embedded in the lower end flange of the bobbin upward and faces the base of the bent part, and the push-in load is carried by the support wall. This is a transformer that improves pin terminal push-in strength, improves quality, improves yield by reducing defective rate, improves work efficiency, and further reduces the size of the pin embedded, allowing for smaller bobbins. This is what we are trying to provide.

Means for Solving the Problems The technical means of the present invention for solving the above problems is a structure in which a metal pin terminal embedded in the lower end flange of the bobbin is supported in the protective case so as to face the bent part. That is.

action The effect of this technical means is as follows.

In other words, a support wall is provided inside the protective case so as to face the bent part of the metal pin terminal embedded in the lower end flange of the bobbin that passes through the upper side. It has a structure that can receive indentation loads. Even if the pin pushing strength of the bobbin is weak, the metal pin terminal of the bobbin is in contact with the support wall provided inside the protective case, so even if the metal pin terminal is pushed in, the metal pin terminal will not move and the iron core and metal There are no defects such as short circuits due to contact with pin terminals or lead wires being pulled and disconnected due to movement of metal pin terminals. Further, even if an abnormal load is applied during the process of inserting the bottom plate into the metal pin terminal, the inspection process, or even the user process, there is no problem at all because the load is applied to the support wall provided within the protective case. More than that, the degree can be significantly improved and the quality improved.

Reduction of defective rate 1 Work efficiency can be improved.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. FIG. 1 is a cross-sectional view of the assembled transformer of the present invention. FIG. 2 is a diagram showing the protective case of the present invention before assembly. In FIG. 1, reference numeral 14 denotes a cylindrical portion of the bobbin 4. A lower end flange 3 is provided on the outer periphery of the upper end of the cylindrical portion 14, and a lower end flange 2 is provided on the outer periphery of the lower end on the opposite side. This lower end flange 2 has a pull-out groove 12, and a metal pin terminal 5 in the shape of a letter is embedded.A copper wire is wound around such a bobbin 4 and connected to the metal pin terminal 6 by soldering. is inserted into the cylindrical part 14 of the bobbin 4, and the assembled coil 1 with the core inserted is inserted into the protective case 7, and the insulating material 13 is cast therein.Then, the bottom plate 11 is inserted. The transformer is completed by inserting and fitting the metal pin terminals 5 embedded in the bobbin 4 through the open opening of the protective case 7. Figure 1 shows a cross-sectional view of the transformer. Figure 2 shows the protective case 7. The case 7 has a core insertion guide wall 8 and a support wall 9 connected thereto inside.

Next, the configuration of this embodiment will be explained. This bobbin 4 has a hole in the center into which the iron core 1o is inserted, and a cylindrical part 14 around which the coil 1 is wound. A lower end flange 3 is provided on the outer periphery of the upper end of the cylindrical portion 14, and a lower end flange 2 is provided on the outer periphery of the lower end. This lower end collar 2 has a lead-out groove 12 through which the lead wire of the coil 1 wound around the cylindrical part 14 is passed.
Furthermore, the metal pin terminal 6 penetrates from the lower surface to the upper surface of the lower end collar 2, and has a pin terminal portion 52L with its protruding portion bent to the side surface. The lead wire θ drawn out from the coil 1 wound on the bobbin 4 is wired to the pin terminal portion 51L through the lead-out groove 12 and connected by soldering. Thereafter, the iron core 10 is inserted into the hole in the center of the bobbin 4 and inside the cylindrical part 14. The coil with the core inserted is then placed in the second
Insert it into a protective case 7 as shown in the figure. A support wall 9 integrally formed with the protective case 7 is provided inside the protective case 7 at a location facing the bent portion of the metal pin terminal 6 provided on the lower end collar 2 of the bobbin 4. Push and insert the cored coil through the open opening of the protective case 7. At that time, both end surfaces of the iron core 10 are connected to left and right support walls 9 provided inside the protective case T.
The case opening side (upper side) of the support wall 9 is configured to directly contact the bent portion of the metal pin terminal 5 provided on the lower end collar 2 of the bobbin 4.

Thereafter, an insulating material 13 such as wax or silicone is cast from the opening of the protective case 7 to the area where the coil 1 is covered.

Then, the bottom plate 11 is inserted by aligning the holes with the metal pin terminals 6 provided on the lower end collar 2 of the bobbin 4, and is press-fitted into the protective case 7 as it is. Thereafter, the hot-melt insulating material 13 such as wax is cooled, and the thermosetting insulating material 13 such as silicon is thermoset to complete the transformer.

As described in detail, the present invention allows the pin push-in strength of the transformer to be significantly increased by abutting the bent portion of the metal pin terminal provided at the lower end flange of the bobbin on the support wall provided inside the protective case. improve. Manufacturing 7 Q -Q -A Z d
6, y% i m t 7 'I W W I
In the assembly process of DOU-1#-, there are no fatal defects as a transformer such as wire breaks and shorts, short bottle dimensions, etc., the yield is improved by lowering the defective rate, work efficiency is improved, and even the lower end of the bobbin is fixed. It becomes possible to reduce the size of pin implantation, and the size of the transformer can be reduced.

Also, the pin crusher and crushing position in the pobin maker,
There are major benefits such as no need for strict management of mold bottle diameter, etc., and productivity is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of an embodiment of the transformer of the present invention after assembly, FIG. 2 is a perspective view of a protective case of the embodiment of the present invention, and FIG. 3 is a cross-sectional view of the structure of a conventional transformer. A perspective view of the parts, Figure 4 is a sectional view showing the structure of a conventional transformer after assembly, Figure 6 &
, b are a perspective view and a sectional view of main parts showing the structure of a bobbin used in this transformer. 1...Coil, 2...Lower end flange, 3...
...Lower end tsuba, 4...Bobbin, 5...
Metal pin terminal, 6...Lead wire, 7...
・Protective case, 9...Support wall, 1o...
Iron core, 11...Bottom plate, 13...Insulating material,
14...Cylindrical part. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 5, 9

Claims (1)

[Claims] The bobbin has a cylindrical part through which the iron core passes through the center and a coil is wound around the outer periphery, and an upper end flange and a lower end flange are provided on the outer periphery of the upper and lower ends of this cylindrical part, and the coil is pulled out from the lower end flange. It has a pull-out groove through which the lead wire passes, and a metal pin terminal is passed through the lower end flange from the lower surface to the upper surface, the pin terminal protruding from the lower end flange upper surface is bent to the side, and the lead wire is soldered to that part. The transformer is assembled in an insulating protection case having a structure in which a support wall abuts a bent portion of a metal pin terminal that is connected to the lower end flange, penetrates from the lower surface to the upper surface, and is bent to the side.