JPH0374019B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a transformer used in consumer and industrial electronic equipment.

Conventional configurations and their problems In recent years, automation of winding, wiring, and finishing processes has been adopted as a trend to reduce the cost of transformers. Types that attach directly to printed circuit boards are becoming mainstream.

In this case, there are various restrictions on the number of terminals of the transformer, wiring work, and soldering work.

The conventional tunnel truss as described above will be described below with reference to the drawings.

In Figures 1 to 4, 1 has tsuba 2 and 3 on both ends.
The coil bobbin has a winding 4 wound thereon, and the collars 2 and 3 of the coil bobbin 1 have a lead wire 5 of the winding 4.
Several lead-out grooves 6 are provided for pulling out the wires, and terminal pins 7 are implanted on the upper surfaces of the collars 2 and 3 adjacent to the lead-out grooves 6. are wound and connected by solder 8. Furthermore, positioning dowels 9 and 10 are provided at both ends of the flanges 2 and 3, and one of the positioning dowels 9 is high in height and also functions for positioning with the printed circuit board.

An EE type or EI type iron core 11 made of a laminated silicon steel plate core is incorporated into such a coil bobbin 1 to form a transformer body.

This transformer body is assembled into a case 12 with an open bottom, and the ceiling surface of this case 12 is provided with pin holes 13 from which terminal pins 7 protrude, and dowel holes 14 into which positioning dowels 9 and 10 are fitted. .

The state assembled in this way is shown in FIGS. 2 and 3. According to this configuration, positioning dowels 9 and 10 are provided at both ends of the flanges 2 and 3, so that the pull-out groove 6 and the terminal pin 7 In addition, as shown in FIG. 4, when dipped and soldered the connecting portion of the lead wire 5 and the terminal pin 7 in the solder bath 15, the positioning dowels 9 and 10 are used. A special solder bath 15 is required, and the shape of the coil bobbin 1 is complicated, so the cost of the mold for forming the coil bobbin 1 is high, the mold production time is long, and the positioning dowels 9 and 10 are present. The work of winding the leader wire 5 around the terminal pin 7 was difficult and the work efficiency was poor, which hindered equipment automation.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide a transformer that facilitates wiring work and can increase the number of terminal pins.

Structure of the Invention In order to achieve the above object, the transformer of the present invention has a terminal pin for connecting a lead wire of the winding wire embedded in the collar of a coil bobbin having a winding wire thereon, and an iron core incorporated in the coil bobbin. The coil bobbin is housed and fixed in a case that has a pin hole through which the terminal pin passes and several dowels that protrude downward on the inner surface of the ceiling. There is no need to provide a dowel on the collar, the number of terminal pins can be increased, and winding and soldering work of the lead wire around the terminal pin becomes extremely easy.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 5 to 8.

16 is a coil bobbin made of synthetic resin;
This coil bobbin 16 has flanges 17 and 18 at both ends, and a winding 19 is wound between the flanges 17 and 18. The collars 17 and 18 have a plurality of pull-out grooves 20.
is provided, and a collar 17 adjacent to this pull-out groove 20,
A plurality of terminal pins 21 are implanted on the upper surface of 18,
A lead wire 22 drawn out from the winding 19 through a lead-out groove 20 is wound around the terminal pin 21 and connected with solder 23 . Also, Tsuba 17,1
An engaging protrusion 24 is provided on the side surface of 8.

An iron core 25 made of an EI type or EE type silicon steel plate is incorporated into such a coil bobbin 16 to constitute a transformer body.

This transformer body is covered with a case 26 made of synthetic resin or the like. The ceiling surface of this case 26 is provided with pin holes 27 corresponding to the number of terminal pins 21 through which the terminal pins 21 pass through and protrude to the top surface, and at least two corners of the top surface are provided with pin holes 27 that allow the terminal pins 21 to pass through and protrude to the top surface. A positioning dowel 28 for positioning is provided.

Further, on the inner surface of the ceiling surface of this case 26, a plurality of dowels 29 are provided as spacers that protrude downward, and on the inner surface of the side plate of the case 26, the side surfaces of the flanges 17 and 18 of the coil bobbin 16 are provided. An engagement protrusion 30 is provided that engages with the engagement protrusion 24 provided in the.

With this configuration, from the top of the transformer body,
When the case 26 is placed over the terminal pin 21 so that the pin hole 27 is aligned with the terminal pin 21, the dowel 29 acts as a spacer.
contact the upper surfaces of the flanges 17 and 18 of the transformer body, and at the same time the engaging protrusion 24 of the transformer body contacts the case 2.
6, and the case 26 is coupled to the transformer body.

Further, as the coil bobbin 16, the collars 17, 1
Since no dowel is provided on the wire 8, it is easy to wind the lead wire 22 of the winding 19 around the terminal pin 21, and wiring using an automatic winding machine is possible.Moreover, as shown in FIG. A common solder tank 31 is also used when connecting the winding parts of 22 with solder 23.
You will be able to use it.

Effects of the Invention As described above, the transformer of the present invention has a dowel on the inner surface of the ceiling surface of the case that maintains a constant distance between the transformer body and the ceiling surface, and an engaging protrusion on the inner surface of the case side plate.
By integrating the engagement protrusion of the coil bobbin, it is possible to wind the lead wire and provide stable insulation protection for the connection part.The shape of the coil bobbin can be made simple, and the design allows for more terminal pins and lead-out grooves. This makes it easier to wind the lead wire around the terminal pin, and it also makes it easier to solder, which greatly improves work efficiency and is also advantageous in terms of cost, reducing the cost of molding molds and reducing the cost of molds. The creation and delivery time can be shortened, the winding and wiring processes, finishing processes such as soldering, and assembly processes can be automated, and equipment costs can be reduced.
It has great industrial value.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing a conventional transformer, Fig. 2 is a perspective view of the same, Fig. 3 is a sectional view of the main part, Fig. 4 is an explanatory view showing the same when soldered, and Fig. 5 is the present invention. FIG. 6 is an exploded perspective view showing one embodiment of the transformer, FIG. 6 is a perspective view of the same, FIG. 7 is a sectional view of the main parts of the same, and FIG. 8 is an explanatory view showing the same at the time of soldering. 16...Coil bobbin, 17,18...Tsuba, 1
9... Winding wire, 20... Leading groove, 21... Terminal pin, 22... Leading wire, 23... Solder, 24... Engaging protrusion, 25... Iron core, 26... Case, 27...
...pin hole, 28...positioning dowel, 29...dowel, 30...engaging protrusion.

Claims (1)

[Claims] 1. A terminal pin for connecting the lead wire of the winding is planted on the upper surface of the flange of a coil bobbin with a winding, and an engaging protrusion is provided on the side surface of this flange, and an iron core is incorporated into this coil bobbin. , a pin hole is provided for the terminal pin to pass through, and several dowels are provided to protrude downward from the inner surface of the ceiling surface, and to protect the coil bobbin flange and the connection portion, and several dowels are provided to protect the lead wire and the connection portion. A transformer that is housed and fixed in a case that has an engaging protrusion that engages with the engaging protrusion of the collar.