JPH046177Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a transformer used in consumer electrical equipment.

(Prior art and problems) Conventionally, an inner bobbin and an outer bobbin are combined, and the inner coil lead wire and the outer lead wire are connected on the outer surface of the collar of the inner bobbin, and then the outer bobbin is connected to the inner bobbin. A transformer constructed by covering the structure has been proposed.

This type of transformer is, for example,
As shown in FIG. 4, flanges 3 and 4 are provided at both ends of an inner bobbin 2 around which an inner coil 1 is wound. Thin locking portions 5 are provided on both side edges of one collar 3, and a locking portion 6 and a lead wire 7 of the inner coil 1 are provided on the other collar 4.
A slit 8 is provided for pulling out the. In addition, a box part 9 for guiding the iron core is provided on the outside of the outer end surface of the collar 4, and on the front side of each box part 9, there is an L-shaped groove 11 into which an external lead wire 10 is press-fitted and fixed, and a slit. A connection recess 12 is formed that communicates the L-shaped groove 11 with the external lead wire 10 , and the external lead wire 10 and the lead wire 7 are connected within the connection recess 12 .
Note that the L-shaped groove 11 is provided with a rib 13 and a locking piece 14 for preventing the external lead wire 10 from coming off.

Further, an outer bobbin (not shown) is covered with the inner bobbin 2.

The transformer having the above structure is constructed by combining an inner bobbin 2 and an outer bobbin, and an external lead wire 10 is attached to the inner bobbin 2. This external lead wire 10 has an L-shaped shape in order to provide its tensile strength. It is bent into an L shape in the groove 11 and pushed into the groove. However, if the L-shaped groove 11 is narrow and the external lead wire 10 is thick, there is a problem in that it is difficult to bend it into an L shape and push it in.

(Means for solving the problem) The present invention is an attempt to solve the above-mentioned problems.It has good workability when manufacturing a coil, and also provides a way to maintain the lead wire even when an external force is applied to the external lead wire. The purpose is to provide a transformer that does not disconnect.

In order to achieve the above-mentioned object, the present invention provides an inner bobbin around which an inner coil is wound, which is covered with an outer bobbin around which an outer coil is wound. A connection recess is formed in the box part for connecting and storing the lead wire of the inner coil and the external lead wire, and a protrusion for press-fitting and fixing the external lead wire into the connection recess is formed. Further, the outer end surface of the box part is characterized in that a lead-out groove is formed in the outer end surface of the box part to accommodate and hold the external lead wire which is drawn out to the outside and is bent when the outer bobbin is covered.

(Function) In the above-described transformer of the present invention, a connection recess having a protrusion is formed in the box portion provided on the inner bobbin, and the external lead wire and the outgoing wire are connected and housed within this connection recess. The external lead wire is press-fitted into the protrusion.

Further, when the outer bobbin is covered with the inner bobbin, the external lead wire is bent and stored and held in the pull-out groove.

(Example) An example of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. First, in FIGS. 1 and 2, this transformer is constructed by winding an outer coil 23 around the outer circumference of an inner bobbin 20 around which an inner coil 22 is wound. outer bobbin 21
is fitted and configured.

That is, a substantially rectangular core insertion hole 2 for inserting a core (not shown) is provided in the center of the inner bobbin 20.
4 is formed, and tsuba 2 is formed at both ends of the body.
5 and 26 are formed. However, one tsuba 2
6 is formed with an inner slit 28 for drawing out the lead wire 27 of the inner coil 22. Furthermore, Tsuba 2
Two box portions 29 are formed on each outer end surface of the box portions 6 to face each other with a groove portion 26' for guiding an iron core (not shown) in between, and connection recesses 32 are formed on the left and right sides of the front surface of the box portions 29, respectively. A protrusion 31 having a triangular shape, for example, is formed in the outer part of the connection recess 32 and located at the lower side in the illustrated state, and an external lead and a leader wire are formed in the inner part of the connection recess 32. The connection part is stored.

Note that the external lead wire 3 is connected to one side of the connection recess 32.
0 to prevent it from coming off, and a pull-out groove 34 for guiding and accommodating the external lead wire 30 is formed on the outer surface of each of the connection recesses 32. The external lead wire 30 is housed in the lead-out groove 34 by the lower end of the collar 37 of the outer bobbin 21, and is drawn out from the lower end.

In addition, the outer bobbin 21 has an inner bobbin 20 attached to the body.
An opening 35 corresponding to the shape of the body is formed to fit the body, and flanges 36 and 37 are formed at both ends of the body. Note that one of the collars 36 is formed with a plurality of outer slits 38 for drawing out lead wires (not shown) of the outer coil 23, and an engaging piece 39 that projects toward the opening 35 and engages with the collar 25 of the inner bobbin 20. There is.

Further, a U-shaped cover 40 is formed on the outer end surface of the other collar 37 to cover the outer peripheral surface of the box portion 29 of the inner bobbin 20.

A slit 41 that reaches the bottom of the collar 26 and the box part 29 is provided between the connection recesses 32 provided on the left and right sides of the box part 29, and this slit 41 secures the creepage distance between different poles and , slides on a convex portion (not shown) formed on the inside of the cover 40 of the outer bobbin 21 to assist in fitting.

FIG. 3 is a front view seen from the bottom when the inner bobbin 20 and the outer bobbin 21 are fitted, and the outer lead wire 30 is held in the lead-out groove 34 and pressed against the cover 40 of the outer bobbin 21. is fixed.

When assembling, the inner coil 22 is wound around the inner bobbin 20, and the lead wire 27 of the inner coil 22 is
from the inner slit 28 and connect the outer lead wire 3.
The inner coil 22 is completed by winding it around the tip of the coil 0 and soldering it, storing it in the connection recess 32 and press-fitting it into the protrusion 31. Further, the outer coil 23 is wound around the outer bobbin 21, and an external lead wire (not shown) is connected to a leader wire (not shown) pulled out from the outer slit 38, thereby completing the outer coil 23.

When the inner bobbin 20 is stored in the opening 35 of the outer bobbin 21, the outer lead wire 30 of the inner coil 22 comes into contact with the cover 40 of the outer bobbin 21 and is bent, and the outer lead wire 30 is bent outward. It is pressed inward by the cover 40 of the bobbin 21 and stored and held in the drawer groove 34 formed in the inner bobbin 20. Next, the core insertion hole 2 of the inner bobbin 20
An iron core (not shown) is incorporated in 4 to form a transformer, and the connecting portion between the lead wire 27 of the inner bobbin 20 and the outer lead wire 30 is completely covered and protected by the cover 40 of the outer bobbin 21.

(Effect of the invention) As described above, according to the invention, the inner bobbin has
A box portion having a connection recess for connecting and storing the lead wire of the inner coil and the external lead wire is formed, and a protrusion for press-fitting and fixing the external lead wire into the connection recess is formed, and the inner bobbin is connected to the outer bobbin. The external lead is automatically bent by the outer bobbin when the external lead is assembled into the box. Since the work of manually bending the coil into an L shape and press-fitting it is avoided, work efficiency is improved when manufacturing the coil.
It is possible to provide a transformer in which a leader wire does not break even if an external force is applied to the external lead wire.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the transformer of the present invention, of which Figure 1 is a perspective view of the inner bobbin and outer bobbin, and Figure 2 is a perspective view of the inner bobbin fitted into the outer bobbin. Figure 3 is a front view seen from the bottom, showing how it is installed.
FIG. 4 is a front view of an inner bobbin showing a conventional transformer. 20...Inner bobbin, 21...Outer bobbin, 2
2...Inner coil, 23...Outer coil, 24...
... Core insertion hole, 25, 26 ... Flange, 26' ... Groove, 27 ... Lead wire, 28 ... Inner slit, 2
9... Box part, 30... External lead wire, 31
... Protrusion, 32 ... Connection recess, 33 ... Rib, 3
4...Drawer groove, 35...Opening, 36, 37...
...outer collar, 38...outer slit, 39...engaging piece, 40...cover, 41...slit.

Claims (1)

[Scope of utility model registration request] In the inner bobbin around which the inner coil is wound, which is covered by the outer bobbin around which the outer coil is wound,
A box portion is formed on the outer end surface of one collar of the inner bobbin, and a connection recess for connecting and accommodating the lead wire of the inner coil and the external lead wire is formed in the box portion. A protrusion is formed for press-fitting and fixing the external lead wire, and a drawer is provided on the outer end surface of the box portion to accommodate and hold the external lead wire, which is pulled out to the outside and is bent when the outer bobbin is covered. A transformer characterized by having grooves formed therein.