JPH0214185Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Target of the Invention/Field of Industrial Application) The present invention relates to the improvement of a transformer having an OI type core, and is particularly suitable for use when the transformer is attached to a printed circuit board or a case.

(Prior Art) Conventionally, a transformer having an OI-type core, which is a combination of one I-type core and two O-type cores, has been used.
Insert the shaped core with both ends protruding,
Two O-shaped cores surround the outer periphery of a coil bobbin and sandwich the protrusion of an I-shaped core. Conventionally, in order to attach this transformer to a printed circuit board or a case, for example, frame-shaped mounting brackets are fitted around the outer periphery of both O-shaped cores, and the transformer body is wrapped around the transformer body. In this conventional transformer, the mounting bracket becomes large, increasing the external dimensions and weight of the transformer, and the fixing force between the mounting bracket and the transformer body is weak, resulting in the transformer body slipping out from the mounting bracket. There was a problem. Furthermore, for example, an electrode lead-out terminal attached to a coil bobbin is attached by directly soldering to a printed circuit board, but this is limited to extremely small transformers and is susceptible to vibration and shock.

(Purpose of the invention) The present invention was made in view of the above-mentioned circumstances, and aims to provide a transformer that does not increase the external dimensions and weight of the transformer and has mounting brackets with strong fixing force. .

(Structure of the invention) The present invention has a core insertion hole 4 in the coil bobbin 1.
In a transformer, two I-shaped cores 6 are inserted so that their both ends protrude from the coil bobbin 1, and two O-shaped cores 7, 7 are fitted onto the coil bobbin 1 so as to sandwich the I-shaped core 6, A mounting bracket consisting of a U-shaped frame portion 9 inserted into the core insertion hole 4 and fitted onto the I-shaped core 6, and mounting legs 10 integrally formed on both ends of the U-shaped frame portion 9. 5 is provided, and engaging pieces 11 and 12 for fixing the coil bobbin are integrally formed on the U-shaped frame portion 9, and both the O
A structure is adopted in which cores 7, 7 are held between substantially U-shaped elastic fixtures 8.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 and 2, coils 2a and 2b are wound around the outer periphery of a coil bobbin 1, and the end electrodes thereof are connected to pin terminals 3a and 3b protruding from the coil bobbin 1. coil bobbin 1
A core insertion hole 4 is provided in the center of the coil bobbin 1, and a mounting bracket 5 and an I-shaped core 6 are inserted through this core insertion hole. The protrusions 6a and 6b from the core insertion hole 4 of the O-shaped core 6 are sandwiched between the two O-shaped cores 7 and 7 by the fixing fittings 8 and 8.
It is fixed by sandwiching it.

Referring also to FIG. 3, the mounting bracket 5 has a U-shaped frame portion 9 in the center and mounting leg portions 10 wider than the U-shaped frame portion 9 at both ends thereof. The width S of the U-shaped frame portion 9 is slightly narrower than that of the I-shaped core 6, and the distance between the outer surfaces of the opposing sides 9a and 9a is approximately the same as the width of the core insertion hole 4 of the coil bobbin 1. Although they are curved and can be inserted and removed from each other, they are designed so that there is no wobbling. Engagement pieces 1 are provided on the opposing sides 9a, 9a for engaging the upper and lower surfaces of the coil bobbin 1 to restrict mutual axial movement.
1, 11, 12, and 12 are bent outward at right angles. Engagement piece 1 closer to central side 9b
2 and 12, until the U-shaped frame portion 9 is inserted into the core insertion hole 4, the opposing sides 9a,
A notch is simply provided in 9a, and after being inserted, it is bent into an upright state as shown by the solid line. Also, these engaging pieces 11, 11, 12, 12
does not protrude in the width S direction, and the U-shaped frame portion 9
I-shaped core 6 and two O-shaped cores 7 fitted inside,
7 has come into direct contact. A protruding piece 13 is provided near the center of the central side portion 9b, and this protruding piece 13 fits into the hole 8 of the fixing fitting 8.
The position of the fixing metal fitting 8 is regulated by fitting into the hole a.

This fixing fitting 8 has a substantially U-shaped cross section and is elastic, and elastically abuts on each outer surface of the O-shaped cores 7, 7, and connects both the O-shaped cores 7, 7 to the I-shaped core. 6
They are designed to be fixed by sandwiching them and pulling them together. Further, varnishing may be applied as necessary for adhesion, insulation, or moisture proofing. 10a,
10a is a hole provided in the mounting leg portion 10.

In the transformer configured as described above, the mounting bracket 5 is inserted into the core insertion hole 4 of the coil bobbin 1, and the I-shaped core 6 is fitted into the U-shaped frame 9, so that it can be fixed. The force is strong, and only the mounting bracket 5 will not fall out. In addition, the mounting bracket is small and the weight and external dimensions of the transformer can be reduced. Since the engaging pieces 11 and 12 are provided, the fixing force between the mounting bracket 5 and the coil bobbin 1 is even stronger, and it can withstand long-term use, vibration, and impact without rattling. In addition, since the mounting bracket 5 and the coil bobbin 1 are positioned by the engagement pieces 11 and 12, assembly is easy and the
The shaped core 6 is also positioned to prevent variations in characteristics and magnetic distortion due to core misalignment. Since the U-shaped frame portion 9 covers the circumferential surface of the I-shaped core 6, it acts as a magnetic shield and can reduce leakage magnetic flux. Furthermore, the structure is simple and inexpensive.

In this embodiment, the engaging pieces 11 and 12 are provided on both opposing sides 9a and 9a, but one opposing side 9
The mounting bracket 5 may be provided only on the mounting bracket 5, and the shape of the mounting bracket 5 can be changed in various ways. For example, the mounting leg portion 10 may be provided on an extension in the same direction as the opposing sides 9a, 9a,
Furthermore, the end portions may be connected to form a rectangular frame-shaped mounting bracket as a whole.

(Effects of the invention) According to the invention, the U-shaped frame of the mounting bracket for attaching the transformer to a printed circuit board etc. is fitted only to the central I-shaped core of the three cores. , it is possible to downsize the mounting bracket,
The external dimensions and weight of the transformer can be reduced.

In addition, since an engaging piece for fixing the coil bobbin is integrally formed on the U-shaped frame, and both O-shaped cores are held between the substantially U-shaped elastic fixing fittings, the three cores and the coil bobbin can be easily and easily attached. Not only can they be reliably integrated, but also the elastic force of the fixing metal fittings can ensure that both O-shaped cores and I-shaped cores are brought into close contact with each other, so that no gaps occur between them, and the magnetic Leakage can be kept to a minimum.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view with one O-shaped core removed and partially cut away, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line -
The figure is a perspective view of the mounting bracket. DESCRIPTION OF SYMBOLS 1... Coil bobbin, 4... Core insertion hole, 5... Mounting bracket, 6... I-shaped core, 7... O-shaped core, 8... Fixing bracket, 9... U-shaped frame, 10... Mounting leg, 11, 1
2...Engagement piece.

Claims (1)

[Scope of utility model registration request] In a transformer, an I-shaped core is inserted into a core insertion hole of a coil bobbin so that both ends thereof protrude from the coil bobbin, and two O-shaped cores are fitted onto the coil bobbin so as to sandwich the I-shaped core, A mounting bracket is provided, which includes a U-shaped frame portion inserted into the core insertion hole and fitted onto the I-shaped core, and mounting legs integrally formed at both ends of the U-shaped frame portion; A transformer in which an engagement piece for fixing a coil bobbin is integrally formed on a U-shaped frame portion, and both O-shaped cores are held between substantially U-shaped elastic fixing fittings.