JPH0140175Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transformer assembled with a plurality of coil bobbins wound with coils.

Generally, a coil such as a power transformer is wound in advance around a coil bobbin serving as a winding frame, and the transformer is formed by assembling the coil bobbin around which the coil is wound around an iron core.

However, in transformers using such coil bobbins, the coupling structure of the coil bobbins for the primary coil and the secondary coil is complicated, and the coupling process takes too much time, and the connections between each coil end and the external circuit lead are complicated. There was a problem that the solder connection work became troublesome. Further, when an external force is applied to the lead, the lead easily separates from the soldered portion with the end of the coil, which poses a risk of causing a short circuit accident.

This invention solves these problems,
In particular, it is an object of the present invention to provide a transformer in which coil bobbins can be easily assembled, and peeling does not occur at the solder joint between the coil end and the lead end.

An embodiment of the present invention will be described below with respect to an OI type iron core transformer.

FIG. 1 is an exploded perspective view specifically showing a method of assembling a coil bobbin and a terminal member to form a transformer body according to the present invention.First, the shapes of the coil bobbin and terminal member will be described in detail.

In Figure 1, 1 has flanges 2 and 3 at the top and bottom.
A secondary coil is wound around the body 4 between the flanges 2 and 3. There is a dish-shaped shallow recess 5 on the upper surface of the flange 2.
is provided, and four protrusions 6 are provided at each set of opposing portions in this recess 5. On the other hand, four long holes 7 for drawing out the coil ends are bored in each pair of opposing parts of the flange 3, and a hole opening outward is provided on the lower surface of the flange 3 in a part surrounding these long holes 7. A character frame 8 is provided. Note that 9 is a guide protrusion for smoothly guiding a part of a terminal member, which will be described later, into the U-shaped frame 8. 10 is a bobbin hole into which an internal bobbin 11 is inserted and held.

The internal bobbin 11 has flanges 12 and 13 at the top and bottom.
and a body part 14 between each flange 12, 13, and a primary coil is wound around this body part 14. Each of the above projections 6 is fitted into the flange 12, and four elongated holes 1 are formed for drawing out the coil ends.
5 are provided, and a U-shaped frame 16 that opens outward is integrally provided so as to surround these elongated holes 15. Reference numeral 17 denotes a guide protrusion that protrudes from the top of the tip of the protrusion between the elongated holes 15.

The recess 5 is designed to fit and support the lower surface of the flange 12 when the internal bobbin 11 is inserted into the bobbin hole 10. Further, during this insertion, the other flange 13 is supported by a ring-shaped protrusion 18 that protrudes from the lower part of the bobbin hole 10.

Reference numeral 19 denotes a pair of terminal members on the left and right, which as a whole includes a pair of upright pieces 20 and 21 and both of these upright pieces 20 and 2.
It consists of a member with a U-shaped cross section and an intermediate piece 22 between the two. In this terminal member 19, the upper and lower upstanding pieces 2
0 and 21 are provided with three vertical guide pieces 24 each forming a passage 23 penetrating vertically, and a holding piece 25 having a V-shaped notch is protruded between each of these guide pieces 24. ing. 26 is the intermediate piece 22
These guide pieces 26 are provided with four through holes 27 for guiding the external lead and a locking groove 28 for holding the external lead. Note that these through holes 27 and locking grooves 28 act as a prevention for the lead wires to come off.
Reference numeral 29 denotes an external lead locking piece protruding from the surface of the guide piece 26 opposite to the side on which the guide piece 24 is located, and has a sawtooth portion with continuous V-shaped notches.

Note that both ends of the two upright pieces 20 and 21 are dimensioned to fit substantially tightly into the U-shaped frames 8 and 16, respectively.

30 is a pair of terminal covers, consisting of a vertical piece 31 with a U-shaped cross section and five guide pieces 32 that project horizontally from the upper and lower ends of this vertical piece 31, and between these guide pieces 32, A guide gap 33 is provided in which the external leads are guided separately. 3
4 is a notch provided on the outermost guide piece 32 for fitting the ends of the upright pieces 20 and 21; 35 is a vertical piece 31;
The two pairs of locking claws provided on the opposing surfaces of the holder are shaped and dimensioned so that they can be locked to the inner edges of the upright pieces 20 and 21.

Note that 36 is a pressing piece of a coil protruding from one side of the intermediate piece 22, 37 is a pressing piece that presses the external lead passing through the locking groove 28, and 38 is a reinforcing piece that reinforces the vertical piece 31 together with the pressing piece 37. It is.

Moreover, 39 is an iron core hole into which the iron core is inserted and held in the internal bobbin 11.

Next, such external bobbin 1, internal bobbin 11,
The order of assembling the transformer using the terminal member 19 and the terminal cover 30 will be described.

First, the external bobbin 1 and internal bobbin 11
The secondary and primary coils 40 and 41 are wound around the bodies 4 and 14, respectively, and as shown in FIG. Insert into hole 10. By this insertion, as described above, the flange 12 is placed in the recess 5 of the flange 2, and the flange 12 is placed in the recess 5 of the flange 2.
3 is locked to the ring-shaped protrusion 18, and the inner bobbin 1
1 is regulated from dropping downward. Moreover, at this time, each protrusion 6 will fit into a part of the elongated hole 15.

In addition, prior to this, the coil end including the intermediate tap of the primary coil 41 is inserted into each of the left and right elongated holes 15.
The coil ends of the secondary coils 40 are pulled out upward one by one from each long hole 7, and the coil ends of the secondary coils 40 are drawn out downward one by one from each elongated hole 7. In addition, the secondary coil 40
As shown in FIG. 3, an insulating paper 42 is wrapped around the outer periphery of the insulating paper 42.

Next, U-shaped frames 8 and 1 provided on the flange 2 of the external bobbin 1 and the flange 12 of the internal bobbin 11
6, the ends of the upright pieces 20 and 21 of the terminal member 19 are press-fitted so as to be interposed therebetween. By this operation, the secondary coil 40 comes to be pressed by the pressing piece 36 integrated with the intermediate piece 22. Also, at this time, the coil ends 40a, 41a of the respective coils 40, 41 pulled out from the elongated holes 7, 15 are inserted into the passage 23 between the respective guide pieces 24, and are held in the V-shaped holding piece 25. Keep it bent.

On the other hand, the external lead 43 is inserted into the core wire 43a from the bottom and top of the upper and lower guide pieces 26 of the terminal member 19.
are inserted into the through holes 27, and the covering portions 43b are bent upward and downward, respectively, and are press-fitted and held in the respective locking grooves 28, and then pulled out in the direction shown in FIG.
Moreover, the core wire 43a inserted into the through hole 27 is
40a, 41a is attached to each coil end,
They are soldered to each other and housed between the guide pieces 24. 44 indicates the hollow part. This prevents the terminal member 19 from falling off from each bobbin 1, 11.

Next, the outermost guide piece 3 of the terminal cover 30
At the same time, the upright pieces 20 and 21 are sandwiched between the two,
The notches 34 are inserted into the ends of the upright pieces 20 and 21. At this time, the covering portions 43b drawn upward and downward through the locking grooves 28 as described above are drawn upward and downward from the guide gaps 33 between the respective guides 32. In this state, by further pressing the terminal cover 30 toward the terminal member 19, the locking pawl 35 wedges into the inner edge of the central portion of the upright pieces 20, 21, as shown in FIG. The exposed portion 44 is prevented. Finally, an I-shaped core 45 is fitted into the bobbin hole 39, and a pair of O-shaped cores 46 are fitted onto the bobbin 2, 12 except for the U-shaped frames 8, 16, and onto the bobbin 3, as shown in FIG. A transformer as shown in is completed.

For the transformer completed in this way,
Each coil end 4 of the primary coil 41 and secondary coil 40
1a and 40a are independently guided through the elongated holes 15 and 7, resulting in excellent insulation, and since they are bent and held by the V-shaped upright pieces 25 of the terminal member, the positions of the coil ends 41a and 40a are fixed. Stabilize.

Furthermore, the core wire 43a of the external lead 43 is connected to the through hole 27.
The covering portion 43b is guided by the locking groove 28 and the locking piece 29, and is bent and held in a U-shape, so even if an external tensile force is applied to the external lead 43, it will not come off. Pulling out is reliably prevented. In this way, problems such as deterioration of the connection state between the coil ends 41a, 40a and the core wire 44 of the external lead 43 are eliminated, the connection state is stabilized, and the durability of the transformer can be improved.

As explained in detail above, according to the present invention, an iron core is attached to a bobbin around which a coil is wound, and a terminal member is provided on the bobbin to separate and guide and hold the coil end and the external lead end of the coil. By fitting the terminal cover into the terminal member, insulation can be ensured between the coil ends and between the external lead ends, and each coil end and external lead can be prevented from being exposed to the outside. Design is improved. Additionally, the overall structure can be made more compact and the shape can be unified.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view for explaining the assembly order of the transformer of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 3, Fig. 3 is a perspective view of the transformer,
The figure is a plan view of the terminal member, and FIG. 5 is a sectional view taken along the line BB in FIG. 4. 1, 11... Bobbin, 19... Terminal member, 30
...Terminal cover, 40, 41 ...Coil, 40
a, 41a...Coil end, 43...External lead,
43a...external lead end, 45, 46...iron core.

Claims (1)

[Scope of utility model registration request] An external bobbin with a long hole for drawing out the coil end provided on the opposing part of the lower flange, an internal bobbin with a long hole for drawing out the coil end provided on the opposing part of the upper flange, and a plurality of external bobbins on the top and bottom respectively. A hole for holding the covering part of the lead, a locking piece having a sawtooth part, and a through hole through which only the core wire is inserted are provided.
A terminal member whose upper and lower ends are tightly fitted to the outside of the long hole, a terminal cover which is wedged and fixed to the terminal member and has a guide gap at the upper and lower ends for pulling out external leads, and is assembled to the bobbin. A transformer characterized by consisting of an iron core.