JPS635210Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a coil bobbin of a type in which pin terminals for primary and secondary coils are protruded on the same surface of a primary side flange, and a primary coil of this coil bobbin. The present invention relates to a transformer characterized by its combination with a synthetic resin cover that is fitted onto the winding portion.

[Technical background of the invention and its problems]

The applicant of the present invention previously disclosed in Utility Application No. 57-82634 that a primary coil winding portion and a secondary coil winding portion are connected via an intermediate flange between a primary side flange and a secondary side flange. A primary coil and a secondary coil are wound around the primary coil winding portion and the secondary coil winding portion of the synthetic resin coil bobbin formed with the above,
A U-shaped synthetic resin cover is installed between the cover fitting groove provided on the circumferential surface of the intermediate flange and the primary flange.
Next, the coil is fitted on all three sides except the coil drawer side.
The primary coil drawn out from the opening on the primary coil drawer side of this synthetic resin cover is
Connect the secondary coil to the pin terminal for the primary coil provided on one side of the next flange, and connect the secondary coil to one side of the synthetic resin cover.
The secondary coil is drawn out to the primary side flange through the outer surface on the opposite side to the opening on the side where the secondary coil is drawn out, and connected to the secondary coil pin terminal provided on the side opposite to the primary coil pin terminal on this primary side flange. Connect the secondary coil, and connect the transformer with the iron core fitted to the coil bobbin and synthetic resin cover in a direction perpendicular to the direction from the opening on the primary coil drawer side of the synthetic resin cover to the opposite side of this opening. is suggesting.

In the previously proposed method, when a synthetic resin cover is fitted to the outer circumference of the flange of the coil bobbin, the inner corner of the U-shape of this cover is
It extends out of the flange to a much greater extent than 90 degrees, then closes and is installed in place. Therefore, the internal stress of the molded product of the cover exceeds the elastic limit.
It does not return to the original 90° interior angle, and this cover
Even in a single unit, the internal angle is 90° or more due to its shape, so combined with the deformation during installation, it does not adhere tightly to the outer peripheral surface of the flange of the coil bobbin.

For this reason, when fitting the iron core, the iron core tends to get caught on this synthetic resin cover, making it difficult to fit the iron core easily. Particularly when using an automatic iron core insertion machine, if there is this kind of catch, there is a risk that various automatic process lines will not be connected smoothly.

[Purpose of invention]

The present invention aims to provide a simple means for this type of transformer that can reliably bring the synthetic resin cover fitted onto the flange of the coil bobbin into close contact with the outer peripheral surface of the flange.

[Summary of the idea]

The structure of the transformer of the present invention is that one
The primary coil and the secondary coil are wound around the primary coil winding part and the secondary coil winding part of the synthetic resin coil bobbin which forms the primary coil winding part and the secondary coil winding part, and the intermediate flange is A synthetic resin cover is fitted between the cover fitting groove provided on the peripheral surface and the primary side flange over three sides excluding the primary coil drawer side, and the opening on the primary coil drawer side of this synthetic resin cover is Connect the primary coil pulled out from the opening to the primary coil pin terminal provided on one side of the primary flange facing this opening, and connect the secondary coil to the opening on the primary coil drawer side of the synthetic resin cover. Connect this secondary coil to a pin terminal for a secondary coil provided on the side opposite to the pin terminal for the primary coil on this primary side flange while drawing it out to the primary side flange through the outer surface on the opposite side, An iron core is fitted into the coil bobbin and the synthetic resin cover in a direction perpendicular to the direction from the opening on the primary coil drawer side of the synthetic resin cover to the opposite side of this opening, and the primary coil pin of the coil bobbin is inserted into the coil bobbin. Both ends of the pin terminal protruding base with the terminal planted therein protrude from the outer peripheral surface of the primary flange, and the protruding parts on both sides are connected to the primary coil winding part side continuously with the outer peripheral surface of the primary flange. The present invention is characterized in that a concave groove is provided, and a convex piece that fits into the concave groove is provided at the tip of the synthetic resin cover on the opening side.

[Example of idea]

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

As shown in Fig. 1, a synthetic resin coil bobbin 1
, a synthetic resin cover 2, an E-shaped iron core 3, and an I-shaped iron core 4 are combined.

The coil bobbin 1 has primary coil winding parts 10 and 2 through an intermediate flange 9 between a primary flange 7 having an insertion hole 6 and a secondary flange 8 in the central leg 5 of an E-shaped iron core 3. A cover fitting groove 12 is provided on the circumferential surface of the intermediate flange 9, and the upper part 13 of the fitting groove of the intermediate flange 9 is formed to protrude from the lower part. Next, a plurality of lead-out grooves 14 for the coil lead-out wire are provided,
In addition, a pin terminal 16 for the primary coil is protruded from the pin terminal protrusion base 15 on one side of the primary flange 7, and a pin terminal 16 for the primary coil is protruded from the pin terminal protrusion base 17 on the other side of the same primary flange 7. A pin terminal 18 is provided protrudingly. 19 is a fitting recess for the E-shaped iron core 3.

The synthetic resin cover 2 is bilaterally symmetrical, has a U-shaped planar shape, and a U-shaped cross section on the inside, and its upper bent edge piece 23 is fitted into the cover fitting groove 12. At the same time, the lower bent edge piece 24 is engaged with the lower surface of the primary side flange 7, and a secondary coil drawer is provided on the outer surface opposite to the opening 25 to match the drawer groove 14 of the coil bobbin 1. Recessed grooves 26 for wire fitting are formed alternately through narrow grooves 27, and furthermore, a secondary protrusion 28 bent into an L shape is integrally provided at the lower part of each recessed groove 26. It becomes.

As shown in FIGS. 2 and 3, the pin terminal projecting base 15 on one side of the primary flange 7 of the coil bobbin 1 is molded into a plurality of parts with a gap 30 in between. A cut groove 31 for inserting the coil lead wire is provided in each protruding base 15, and a primary side protrusion 32 is provided in each protruding base 15 from a position corresponding to the base of each primary coil pin terminal 16.
Also, both ends of the pin terminal protruding base 15 are formed to protrude from the outer peripheral surface of the primary side flange 7, and the protruding parts 33 on both sides are formed so as to be continuous with the outer peripheral surface of the primary side flange 7. A groove 34 is provided from the primary coil winding portion 10 side. Also, between the pin terminal protruding base 15 on one side and the pin terminal protruding base 17 on the other side of the primary side flange 7 and the insertion hole 6 of the E-type iron core 3, partition wall parts 35 and 36 for inserting the iron core are integrally provided. A small protruding strip 37 is formed inside the insertion hole 6 to closely fit the central leg 5 of the E-shaped iron core 3.

Further, as shown in FIG. 4, an ear-shaped recess 41 is provided at the tip of the synthetic resin cover 2 on the side of the opening 25, and a convex piece that fits into the groove 34 is provided inside the ear-shaped recess 41. 42, and 1 on the bent edge piece 24.
In addition to providing an inclined notch 43 that fits between the partition walls 35 and 36 for inserting the iron core of the next side flange 7,
A recess 44 is provided on the secondary convex 28 side to fit into the other side pin terminal projecting base 17 of the primary flange 7 .

Next, to explain the combination of each member, as shown in FIG. 5, the primary coil 47 is wound around the primary coil winding part 10 of the coil bobbin 1, and End line 48
, each pin terminal protrusion base 15 of the primary side flange 7
Pull it out to the outside through the cut groove 31 for pulling out the primary coil between them, and after passing it around the primary coil pin terminal 16 several times between the primary coil protrusion 32 and the primary coil pin terminal 16, twist it only around the pin terminal 16 several times. Next, synthetic resin cover 2
The upper bent edge piece 23 of the cover 2 is fitted into the cover fitting groove 12 of the coil bobbin 1 from the opening 25 side, and the lower bent edge piece 24 is fitted to the lower surface of the primary side flange 7. And ear-shaped recesses 41 on both sides
When you press it inward with your fingertips, the inner convex piece 4
2 enters the inside of the protrusion 33 while deforming,
It fits into the concave groove 34 and restores itself instantly, and this convex piece 4
2 does not come off from the groove 34. Therefore, the opening 25 side of the cover 2 can be held in close contact with the outer peripheral surface of the flange 7. Note that until the cover 2 is completely fitted to the coil bobbin 1, the cover 2 deforms flexibly to enlarge the opening 25.

Furthermore, the secondary coil 49 is attached to the secondary coil winding part 11.
The lead wires 50 at the winding start and winding ends of the secondary coil 49 are passed from the lead-out groove 14 of the intermediate flange 9 through the concave groove 26 of the synthetic resin cover 2 that matches the lead-out groove 14. The secondary convex 28 of the cover 2 and the secondary coil pin terminal 1 of the coil bobbin 1 correspond one-to-one on the primary flange 7.
After passing this lead wire 50 around the terminal 8 several times, it is twisted around only the pin terminal 18 several times.

Furthermore, the pin terminals 16 and 18 on both sides are immersed in melted solder at the same time, and the pin terminals 16 and 18 are soldered to the coil lead wires 48 and 50. Finally, the iron core 3 is attached to the coil bobbin 1 and the synthetic resin cover 2. , 4, and fixed with metal fittings (not shown). The iron cores 3 and 4 are fitted to the coil bobbin 1 and the cover 2 in a direction perpendicular to the direction from the opening 25 on the primary coil extraction side of the cover 2 to the opposite side of the opening 25.

[Effect of idea]

According to the present invention, there is provided a coil bobbin in which pin terminals for the primary and secondary coils are protruded from the same surface of the primary flange, and a synthetic resin cover that is fitted over the primary coil winding portion of the coil bobbin. In the transformer, both ends of the pin terminal protruding base formed by implanting the pin terminal for the primary coil of the coil bobbin protrude from the outer peripheral surface of the primary side flange, and the protruding parts on both sides have 1 A concave groove is provided from the primary coil winding part side continuously with the outer peripheral surface of the next side flange, and a convex piece part that fits into the concave groove is provided at the tip of the synthetic resin cover on the opening side. When fitting the synthetic resin cover onto the coil bobbin, this convex piece also fits into the groove, thereby holding the opening side of the synthetic resin cover in close contact with the outer peripheral surface of the flange and allowing it to expand. The habit can be corrected, and therefore the work of fitting the iron core to the outside of this synthetic resin cover can be carried out smoothly, and even when using an automatic iron core insertion machine, the iron core can be inserted reliably.

[Brief explanation of drawings]

Figures 1 to 5 relate to an embodiment of the transformer of the present invention; Figure 1 is an exploded perspective view thereof, Figure 2 is a front view of the coil bobbin, Figure 3 is a bottom view thereof, and Figure 4 is a diagram of the coil bobbin. 5 is a perspective view of the synthetic resin cover, and FIG. 5 is a sectional view of the assembled state. 1...Synthetic resin coil bobbin, 2...Synthetic resin cover, 3, 4...Iron core, 7...Primary side flange, 8...Secondary side flange, 9...Intermediate flange, 10...Primary coil Winding part, 11...Secondary coil winding part, 12...Cover fitting groove, 15...Pin terminal protruding base, 16...Pin terminal for primary coil, 18...Pin terminal for secondary coil , 25...opening, 33...protrusion, 34...concave groove, 42...
Convex piece portion, 47...primary coil, 49...secondary coil.

Claims (1)

[Scope of utility model registration request] The above-mentioned primary coil winding part and secondary coil in a synthetic resin coil bobbin in which a primary coil winding part and a secondary coil winding part are formed between the primary side flange and the secondary side flange via an intermediate flange. A primary coil and a secondary coil are wound around the winding part, and a synthetic resin cover is placed between the cover fitting groove provided on the circumferential surface of the intermediate flange and the primary flange on three sides excluding the primary coil pull-out side. Connect the primary coil to the primary coil pin terminal provided on one side of the primary flange facing this opening. connection,
The secondary coil is drawn out to the primary flange through the outer surface of the synthetic resin cover opposite to the opening on the primary coil drawer side, and is provided on the side of the primary flange opposite to the primary coil pin terminal. This secondary coil is connected to the pin terminal for the secondary coil, and the coil bobbin and synthetic resin cover are connected in a direction perpendicular to the direction from the opening on the primary coil drawer side of the synthetic resin cover to the opposite side of this opening. Both ends of the pin terminal protruding base, which is formed by fitting an iron core into the coil bobbin and implanting pin terminals for the primary coil of the coil bobbin, from the outer peripheral surface of the primary flange, and attaching the primary coil to the protruding parts on both sides A concave groove is provided from the primary coil winding side continuously with the outer peripheral surface of the side flange,
A transformer characterized in that a convex piece portion that fits into the groove is provided at the tip of the synthetic resin cover on the opening side.