JPS635209Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a transformer having a structure that ensures cross-over insulation between a coil and its lead wire.

[Technical background of the invention and its problems]

Conventionally, as shown in Japanese Utility Model Publication No. 52-57374, a molded body is press-fitted into a notched groove for inserting a coil lead wire provided in the flange of a coil bobbin, and the notched groove is completely covered by this molded body. There is. The molded body of this conventional transformer also serves to provide crossover insulation between the lead wire and the coil.

However, in the method disclosed in this publication, the terminal made of a steel piece press-fitted into the terminal hole of the flange is bent upward while being fitted into the notch on the lower side of the molded body. Although the terminal is used to prevent the molded body from slipping out of the cut groove, the means for fixing the molded body, which involves bending the terminal made of a piece of steel, is time-consuming. In addition, in the case where the molded body is simply press-fitted into the cut groove, there is a problem that the molded body is likely to come off if the flange is thin.

[Purpose of invention]

The object of the present invention is to enable a molded body for cross-over insulation to be attached to a flange with a single touch, and to prevent it from being easily removed once attached.

[Summary of the idea]

The structure of the transformer of the present invention is that the coil is attached to the coil winding part between the flanges of the coil bobbin, and the iron core is fitted. A plurality of planting protrusions are provided with gaps between them, and a plurality of cut grooves for drawing out the coil are provided on the flange in the gaps between the pin terminal planting protrusions, and the pin terminal planting protrusions are provided with cross-over insulation. A molded body made of synthetic resin is fitted from the outside, and this molded body sandwiches the main body part that is abutted against the front surface of the pin terminal implantation convex part and the pin terminal implantation convex parts located at both ends from the outside. an arm portion integrally formed to protrude from both ends of the main body portion and having an engaging claw at its tip; and a protrusion integrally formed to protrude from the main body portion so as to be inserted into the gap between each of the pin terminal implantation convex portions. an inner engaging portion integrally formed to protrude from the main body portion so as to be engaged with the inner surface of the flange; and an inner engaging portion integrally formed to protrude from the side surface of the protruding piece portion so as to be engaged with the outer surface of the flange. and a cross-over insulation protrusion integrally formed to protrude from the tip of the protruding piece so as to be fitted into the tip of the cut groove. be.

[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, an I-shaped iron core 4, and a molded body 5 for crossover insulation are combined.

The coil bobbin 1 has a primary side flange 7 and a primary side flange 2 having an insertion hole 6 into which the central leg of the E-shaped iron core 3 is inserted.
A primary coil winding part 10 and a secondary coil winding part 11 are formed between the next side flange 8 via an intermediate flange 9, and a cover fitting groove 12 is provided on the circumferential surface of the intermediate flange 9. A lead-out groove 1 for the secondary coil lead-out wire is provided in the fitting groove upper part 13 of the intermediate flange 9.
Provide multiple numbers of 4. In addition, a primary coil pin terminal 16 is provided protruding from the pin terminal implantation convex portion 15 on one side of the primary flange 7, and
A secondary coil pin terminal 18 is provided protruding from the pin terminal implantation convex portion 17 on the other side. 19 is E type iron core 3
This is the fitting recess.

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. Concave grooves 26 for wire fitting are formed alternately through narrow grooves 27, and secondary protrusions 28 are integrally provided in correspondence with the lower part of each concave groove 26, and openings are formed. The outer surface of the portion 25 side is provided with an ear-shaped recess 32 that fits into the side protrusion portion 31 of the pin terminal implantation convex portion 15 of the coil bobbin 1 that protrudes from the primary side flange 7. On the part 25 side, there is an inclined notch part 3 that fits into the partition part 33 for fitting the iron core on the primary side of the primary side flange 7.
5 is provided on the secondary side protrusion 28 side of this bent edge piece 24 to fit into the secondary side iron core fitting partition part 34 of the primary side flange 7 and the pin terminal implantation convex part 17. A recess 36 is provided.

Further, as shown in FIGS. 2 to 4, the primary side flange 7 of the coil bobbin 1 has a
A plurality of the pin terminal implantation convex portions 15 in which the pin terminals 16 for the next coil are implanted are provided at intervals, and a planar trapezoidal concave portion 37 is provided between each of the convex portions 15 and the iron core insertion partition wall portion 33. A cut groove 3 is provided in the flange 7 from the gap between the convex parts 15 to the concave part 37 for passing the lead wire from the primary coil.
Furthermore, a primary side protrusion 39 is integrally formed to protrude from the front surface of each pin terminal implantation protrusion 15, and a recess is formed on the lower surface of the side protrusion portion 31 of the protrusion 15 located at both ends. Grooves 40 are provided in the two intermediate protrusions 15 excluding the protrusions 15 at both ends of the cylindrical end, and grooves 41 are provided from the lower side of the protrusion 39 to the left side, as shown in FIGS. 2 and 3. will be established.

Then, the lead wire 44a at the beginning of winding is tied several times to the leftmost pin terminal 16 in FIGS.
After winding the wire several times between the wires, the wire is drawn into the lower side of the flange 7 through the recessed groove 40, the recessed recess 45 between the partition wall 33 for inserting the iron core and the convex portion 15, and the cut groove 38. By rotating the winding core and rotating the coil bobbin 1, the electric wire is wound around the primary coil winding part 10, and the lead wire 44b for the first and second intermediate taps of the primary coil is connected to the cut groove 38. It is pulled out to the outside through the concave groove 41, wound several times between the protrusion 39 and the pin terminal 16, and then retracted to the underside of the flange 5 again following the same route as when it was pulled out. The next coil winding part 10 is wound, and finally, the lead wire 44c at the end of the winding is drawn out to the rightmost pin terminal 16 in FIGS. 2 and 3.
It is wound several times between the pin terminal 16 and the protrusion 39.

Next, as shown in FIGS. 2 to 4, the crossover insulation molded body 5 is fitted onto the pin terminal implantation convex portion 15 from the outside.

As shown in FIGS. 1 to 4, this molded body 5 includes a main body 51 that is brought into contact with the front surface of each pin terminal implantation convex portion 15, and a main body that is designed to sandwich the convex portions 15 at both ends from the outside. The convex portions 1 at both ends are integrally molded to protrude from both ends of the portion 51 in a direction that narrows slightly.
An arm portion 53 integrally formed with an engaging claw 52 that engages with the locking surface 47 of 5 is integrally formed from the main body portion 51 so as to be inserted into the gap between the above-mentioned pin terminal implantation convex portions 15. three protruding pieces 54 formed in a protruding manner;
An inner engaging portion 55 integrally formed to protrude from the main body portion 51 so as to be engaged with the inner surface of the flange 7
and an outer engaging portion 56 that is integrally formed to protrude from the side surfaces of the two protruding pieces 54 excluding the central portion so as to be engaged with the outer surface of the flange 7, and is fitted into the tip of the cut groove 38. A protrusion portion 57 for crossover insulation is integrally formed at the tip of the two long protruding pieces 54 and is integrally molded from synthetic resin.

Then, as shown in Figures 2 to 4,
The arm portions 53 on both sides of this molded body 5 are connected to the convex portions 15 on both sides.
When the protruding pieces 54 are pushed into the gaps between the convex parts 15, the arm parts 53 on both sides, which are shaped to be slightly narrower, are held together by the side protruding parts 31 on both sides. After expanding suddenly, it comes off and closes to its original shape due to the elastic restoring force of the synthetic resin, and the engaging claw 52 at the tip engages with the locking surface 47. Thereby, the movement of the molded body 5 in the vertical direction in FIG. 2 and the movement in the horizontal direction in FIG. 2 can be restricted.

Also, at this time, as shown in FIGS. 5 to 7, the inner engaging portion 55 and the outer engaging portion 56 of the molded body 5
Since the grooves 38 pinch the peripheral edge of the cut groove 38 from the inside and outside, the movement of the molded body 5 in the vertical direction in FIG. 3 can also be restricted.

Then, as shown in FIG. 4, the two protrusions 5
7 to the rightmost and second notch grooves 3, respectively.
By inserting and fitting the protrusion 57 into the tip of the notch 8, the protrusion 57 ensures that the lead-out position of the lead wire in the notch 38 is held at the tip of the notch 38, and the primary coil and Prevent crossover between lead wires and ensure crossover insulation.

Next, to explain the combination of each member, as shown in FIG. 8, the primary coil winding part 1 of the coil bobbin 1
0, and then fit the upper bent edge piece 23 of the cover 2 into the cover fitting groove 12 of the coil bobbin 1 from the opening 25 side of the synthetic resin cover 2. The lower bent edge piece 24 is fitted onto the lower surface of 7. At this time, the cover 2 is flexibly deformed to enlarge the opening 25 until the cover 2 is completely fitted onto the coil bobbin 1.

Furthermore, the secondary coil 62 is attached to the secondary coil winding part 11.
The lead wire 63 at the start and end of the secondary coil 62 is passed from the lead-out groove 14 of the intermediate flange 9 to 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 the lead wire 63 around the terminal 8 several times, the lead wire 63 is twisted around only the secondary 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 44a, 44b, 44c, and 63.Finally, the coil bobbin 1 and the synthetic resin cover 2 are soldered. The iron cores 3 and 4 are fitted to the ends and fixed with metal fittings (not shown).

In this embodiment, as shown in FIGS. 5 to 7, the molded body 5 is located below the protrusion 39. The portion 54 is formed to a height that covers the entirety of each convex portion 15 and the base of the pin terminal 16,
The convex portion 15 may be made so that it cannot be seen from the front.

[Effect of idea]

According to the present invention, a molded body made of synthetic resin for cross-over insulation is fitted onto the pin terminal implantation convex portion of the coil bobbin from the outside, and this molded body is abutted against the front surface of the pin terminal implantation convexity. A body part, an arm part which is integrally molded to protrude from both ends of the body part and has an engaging claw at its tip so as to sandwich the pin terminal implantation convex parts at both ends from the outside, and between each of the pin terminal implantation convex parts. A projecting piece integrally formed to protrude from the main body to be inserted into the gap, an inner engaging portion integrally formed to protrude from the main body to be engaged with the inner surface of the flange, and an outer surface of the flange. an outer engaging portion integrally formed on the side surface of the protruding piece so as to be engaged with the cross-over; Since it is formed to include an insulating protrusion,
This molding is done by a one-touch operation of pushing the arms on both sides of the molded body to the outside of the pin terminal implantation convex parts located at both ends, and pushing each protruding piece into the gap between the convex parts. The body can be attached easily, and the arms on both sides use the elasticity of the synthetic resin to hold the protrusions at both ends, and the engagement claws at the tips engage the protrusions at both ends to cut into the molded body. The movement in the groove direction and the left-right direction can be restricted, and at this time, the inner and outer engaging parts of the molded body squeeze the peripheral edge of the cut groove from the inside and outside, so the vertical movement of the molded body can be restricted. Movement can also be regulated. Therefore, the molded body can be attached to the flange with one touch, and once attached, it will not easily come off. Further, the main body of the molded body can cover and protect the coil lead wire.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the transformer of the present invention, Fig. 2 is a plan view of the molded body fitting part, Fig. 3 is its sectional view, Fig. 4 is its back view,
Figure 5 is a sectional view taken along the - line in Figure 3, and Figure 6 is a cross-sectional view of Figure 3.
FIG. 7 is a cross-sectional view taken along the line -- in FIG. 3, and FIG. 8 is a cross-sectional view showing the assembled state. 1...Coil bobbin, 3, 4...Iron core, 5...
Molded body, 7, 8, 9...flange, 10, 11...
...Coil winding part, 15...Pin terminal implantation convex part, 1
6... Pin terminal, 38... Notch groove, 51... Main body, 52... Engaging claw, 53... Arm, 54...
Projection piece portion, 55...inner engaging portion, 56...outer engaging portion, 57... protrusion portion, 61, 62... coil.

Claims (1)

[Scope of utility model registration request] In a coil bobbin in which a coil is attached to the coil winding portion between the flanges and an iron core is fitted, the flange of the coil bobbin has a pin terminal implanted convex portion with a pin terminal implanted on the outer surface side. The flange is provided with a plurality of cut grooves for drawing out the coil in the gaps between the pin terminal implantation projections, and a synthetic resin molded body for cross-over insulation is placed on the outside of the pin terminal implantation projection. This molded body is fitted from both ends of the main body so as to sandwich the main body part that is in contact with the front surface of the pin terminal implantation convex part and the pin terminal implantation convex parts located at both ends from the outside. an arm portion having an engaging claw at its tip; a protruding piece portion integrally formed to protrude from the main body portion so as to be inserted into the gap between the respective pin terminal implantation convex portions; and an inner surface of the flange. an inner engaging part integrally formed to protrude from the main body so as to be engaged with the main body; an outer engaging part integrally formed to protrude from the side surface of the protruding piece part so as to be engaged with the outer surface of the flange; A transformer characterized by comprising a protrusion portion for crossover insulation that is integrally and protrusively molded at the tip portion of the protruding piece portion so as to be fitted into the tip portion of the cut groove.