JP2009094312A - Transformer mounting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount a transformer while keeping a holding function of a pair of upper and lower cores. <P>SOLUTION: A mounting member 3 is mounted to the transformer 2 from the upper side. Transformer holding parts 11 and 12 hold the transformer 2 by elastic restoration force of themselves by tightly fitting upper-surface contact parts 19 and 22, side-surface contact parts 20 and 23 and lower surface contact parts 21 and 24 to the upper surface 7a of an upper core 7, side surfaces of the pair of upper and lower cores 7 and 8, and the undersurface 8a of the lower core 8, respectively, and thereby displacement of the pair of upper and lower cores 7 and 8 is prevented. The transformer 2 with the mounting member 3 mounted thereto is fastened and fixed to mounting bases 6 of a housing 1 by screws 6. Mounting arm parts 16 are thereby pulled down, and an upper-surface pressing part 15 presses the upper core 7. Pressing force applied to the upper-surface pressing part 15 acts as pressing force of the upper-surface contact parts 19 and 22 of the transformer holding parts 11 and 12 through connection parts 13 and 14, but do not act as force pressing down the side-surface contact parts 20 and 23. The holding function of the transformer holding parts 11 and 12 is then kept in an initial state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a transformer attachment device that holds a transformer and attaches the transformer to a housing.

  The transformer is firmly fixed to a metal casing as an electronic component, and heat generated from the transformer is radiated to the casing. For example, the transformer fixed heat dissipation structure disclosed in Patent Literature 1 has the following configuration.

  The transformer in which the bobbin portion 3 on which the winding is applied is disposed between the pair of magnetic core portions 2 is attached to the metal casing 11 by the elastic material plate 1. The elastic material plate 1 includes a ceiling portion 1A bent inward, both arm portions 1B extending from both ends of the ceiling portion 1A, a plurality of arm pieces 1C extending from both arm portions 1B, and both arm portions 1B. The formed tongue piece 1D to the formed metal casing 11 and the end portion 1b extending inward from both the arm portions 1B are configured.

When the mounting tongue 1D is fixed to the metal casing 11 with screws 12, the ceiling 1A is formed on the upper surface of the magnetic core 2, the arms 1B are formed on the side, and the end 1b is formed on the metal casing 11. Each of the transformers contacts the bottom surface 2b of the magnetic core portion 2 in the groove 11B, presses the transformer against the metal casing 11, and holds it. The arm piece 1C presses and holds the bobbin portion 3A.
JP 2001-143938 A

  In the transformer fixing device disclosed in Patent Document 1, since the elastic plate 1 is formed as a single band, when the screws 12 are fastened to the metal housing 11, the arms 1 </ b> B are distorted. . That is, by tightening the screw 12, the center portion of the ceiling portion 1A is pressed against the upper surface of the magnetic core portion 2, and both ends of the ceiling portion 1A are pulled down. However, since the end portion 1b is regulated by the inner surface of the groove 11B, the both arm portions 1B are curved outward from the pair of magnetic core portions 2 and lose the function of sandwiching the side surfaces of the magnetic core portions 2. is there. In order to solve such a problem, a method of forming the groove 11B to a depth corresponding to the amount of pulling down on both ends of the ceiling portion 1A can be considered. However, in this method, the thickness of the metal casing 11 must be increased, resulting in a problem that the entire product including the metal casing 11 is enlarged, and the bottom surface 2b and the end portion 1b of the magnetic core portion 2 are caused. This causes a problem that the contact with the transformer is cut off and the holding function of the transformer is lowered.

  An object of the present invention is to enable a transformer to be attached while maintaining the holding function of a pair of upper and lower cores.

The present invention according to claim 1 is a transformer mounting device in which a transformer in which a coil bobbin is sandwiched between a pair of upper and lower cores is fixed to a metal casing by an elastic mounting member.
The upper surface pressing portion that presses the upper surface of the upper core and the mounting arm portion that hangs down from both sides of the upper surface pressing portion form a U-shaped transformer fixing portion, and the upper surface contact portion that contacts the upper surface of the upper core; A transformer holding portion formed by a side contact portion that hangs down from both sides of the upper surface contact portion and contacts the upper and lower cores and a lower surface contact portion that bends from the lower end of the side surface contact portion to the lower surface side of the lower core. Arranged in parallel with the transformer fixing portion, the upper surface pressing portion of the transformer fixing portion and the upper surface contact portion of the transformer holding portion are connected by a connecting portion, and the mounting member is connected to the transformer fixing portion, the transformer holding portion, and the It is characterized by comprising a connection part.
In the claims and specification of the present application, the side on which the coil bobbin of the transformer can be seen is the front surface, the rear side is the rear surface, the left and right sides are viewed from the front of the transformer, the upper side is the upper surface, and the lower side is the lower surface. To do. In addition, when the directions of the parts and the like constituting the transformer and the transformer mounting device are described, they are called according to the surface of the transformer.

  According to the present invention described in claim 1, the fixing function and the holding function of the transformer can be made independent, and the holding function of the pair of upper and lower cores constituting the transformer is impaired by the pressure when the transformer is fixed to the casing. There is nothing. Therefore, the transformer is attached to the housing in a stable state resistant to vibrations. Moreover, if a mounting member is mounted on the transformer in advance at the transformer manufacturing factory and transported to an electronic component assembly factory or the like, the upper and lower cores are prevented from being displaced due to vibration during transport, and dust and the like can be prevented from being mixed.

  The invention according to claim 2 is characterized in that the transformer holding part is arranged on both sides of the transformer fixing part, so that the balance of the arrangement of the transformer holding part is good and the holding function of the transformer is further improved. Can be increased.

  According to a third aspect of the present invention, an upper core holding portion extending in a direction perpendicular to a direction in which the upper surface contact portion extends is provided on the upper surface contact portion of each transformer holding portion, and one upper core holding portion is provided. A front contact portion that contacts the front surface of the upper core is formed, and a rear contact portion that contacts the rear surface of the upper core is formed on the other upper core holding portion, so that at least the upper core is held in a cross shape. And the function of holding the transformer can be further enhanced.

  According to a fourth aspect of the present invention, a lower core side surface holding portion is arranged in parallel with the transformer fixing portion or the transformer holding portion, and the upper surface contact is made to contact the lower core side surface holding portion with the upper surface of the upper core. And the side surface contact portion that hangs down from both sides of the upper surface contact portion and contacts the side surface of the lower core, so that the front side of the transformer holds the front surface of the lower core due to the presence of the coil. Although it is difficult, since the side surface holding function of the lower core can be strengthened, the holding function of the upper and lower cores can be further enhanced.

  The present invention according to claim 5 is characterized in that a mounting base protruding upward is formed on the casing, and the mounting arm portion of the transformer fixing portion is screwed to the mounting base. Easy to attach to the body.

  In the present invention, the transformer can be attached to the housing in a state where the upper and lower cores are held so as not to be displaced.

(First embodiment)
Hereinafter, a first embodiment will be described with reference to FIGS. FIG. 1 shows a housing 1 partially shown, a transformer 2 attached to the housing 1, a mounting member 3 of the transformer 2, and a screw 4 for fixing the mounting member 3 to the housing 1 in an exploded manner in the vertical direction. It is.

  Grooves 5 (only three places are shown in FIG. 1) are engraved on the upper surface of the housing 1, and a mounting base 6 having screw holes between the left and right grooves 5 is formed to protrude. Yes. The housing 1 is made of a metallic material having heat dissipation, and is formed by molding including the grooves 5 and the mounting bases 6. Each groove 5 and each mounting base 6 can also be formed on the upper surface of the housing 1 by cutting or welding in a later step.

  The transformer 2 has a configuration in which a coil bobbin 9 in which a pair of upper and lower cores including an upper core 7 and a lower core 8 are wound is sandwiched in a sandwich shape. The front surface and the rear surface of the upper core 7 and the lower core 8 are partially opened to pull out the coil end portion of the coil bobbin 9, and the coil bobbin 9 is visible.

  The mounting member 3 includes a transformer fixing part 10, transformer holding parts 11, 12 arranged in parallel on both sides of the transformer fixing part 10, and between the transformer fixing part 10 and the transformer holding part 11, between the transformer fixing part 10 and the transformer holding part. It is comprised integrally by the connection parts 13 and 14 which connect between. The attachment member 3 is made of a material such as copper, stainless steel, or phosphor bronze, and has elasticity and heat dissipation.

  The transformer fixing portion 10 has a downwardly bent upper surface pressing portion 15 having a flat portion in contact with the upper surface 7 a of the upper core 7, an attachment arm portion 16 that hangs down from the both sides of the transformer 2, and each attachment arm portion 16. It is composed of a mounting portion 17 that is bent at a substantially right angle outward from the lower end, and is formed in a U-shaped cross section. The length of each attachment arm portion 16 is shorter than the length of the pair of upper and lower cores 7 and 8 in the height direction. Each mounting portion 17 is formed with a hole 18 that matches the screw hole of each mounting base 6.

  The transformer holding part 11 has an upper surface contact part 19 that is bent downward and has a flat part that comes into contact with the upper surface 7a of the upper core 7, a side contact part 20 that hangs down to the side of the transformer 2 from both sides, and each side contact part 20 The lower surface contact portion 21 is bent from the lower end to the lower surface 8 a side of the lower core 8. The transformer holding unit 12 is formed in the same shape as the transformer holding unit 11, and includes an upper surface contact portion 22, a side surface contact portion 23, and a lower surface contact portion 24.

  The connecting portions 13 and 14 have a narrower width than the lengths of the upper surface pressing portion 15 of the transformer fixing portion 10 and the upper surface contact portions 19 and 22 of the transformer holding portions 11 and 12, and are connected at substantially the center portion thereof. Yes.

The attachment of the transformer 2 will be described below.
The side surface contact portions 20 and 23 of the transformer holding portions 11 and 12 are opened outward, and the mounting member 3 is mounted on the transformer 2 from above. The transformer holding portions 11 and 12 have their own elastic restoring force, so that the upper surface contact portions 19 and 22, the side surface contact portions 20 and 23, and the lower surface contact portions 21 and 24 are the upper surface 7 a of the upper core 7 of the transformer 2 and a pair of upper and lower cores, respectively. 7 and 8 and the lower surface 8a of the lower core 8 are in close contact with each other to hold the transformer 2. Note that the upper surface pressing portion 15 and the mounting arm portion 16 of the transformer fixing portion 10 are in close contact with the upper surface 7a of the upper core 7 of the transformer 2 and the side surfaces of the pair of upper and lower cores 7 and 8 by their own elastic restoring force. . Accordingly, the transformer 2 is firmly integrated by mounting the mounting member 3, and the pair of upper and lower cores 7 and 8 can be reliably prevented from being displaced. For this reason, for example, if the mounting member 3 is mounted when the transformer 2 is assembled in a transformer manufacturing factory, a pair of upper and lower cores 7 due to vibration during transportation to an electronic component assembly factory or the like is used without using other means. , 8 can be prevented from occurring.

  The transformer 2 with the mounting member 3 mounted thereon is aligned with the lower surface contact portions 21 and 24 of the transformer holding portions 11 and 12 in the groove 5 and the hole 18 in the mounting portion 17 in the transformer fixing portion 10 with the screw hole in the mounting base 6. It is placed on the body 1. By tightening the mounting portion 17 with the screw 4, the mounting arm portion 16 is pulled down. For this reason, the upper surface pressing portion 15 presses the upper surface 7a of the upper core 7 with a predetermined force, and firmly fixes the transformer 2 to the housing 1 (see FIG. 4).

  The pressing force applied to the upper surface pressing portion 15 acts as a force for pressing the upper surface contact portions 19 and 22 of the transformer holding portions 11 and 12 against the upper surface 7a of the upper core 7 through the connection portions 13 and 14 having a narrow width. It hardly works as a force to push down 20 and 23. Therefore, the contact state between the side contact portions 20 and 23 and the side surfaces of the pair of upper and lower cores 7 and 8 does not change (see FIG. 5). For this reason, the transformer holding parts 11 and 12 can maintain the function of holding the transformer 2 firmly by its own elastic force in the initial state.

The above-described first embodiment of the present invention has the following effects.
(1) The transformer fixing part 10 and the transformer holding parts 11 and 12 are arranged separately and integrated by the connecting parts 13 and 14 so that the function of fixing the transformer 2 to the housing 1 and the transformer 2 are integrated. It is possible to make the function held by Therefore, the pressure for fixing the transformer 2 to the casing 1 does not impair the stable holding of the pair of upper and lower cores 7 and 8 and can be structured to be hardly affected by vibration or the like.
(2) The mounting member 3 is easy to handle because the transformer fixing part 10 and the transformer holding parts 11 and 12 are integrated by the connection parts 13 and 14.
(3) Since the transformer holding parts 11 and 12 are arranged on both sides of the transformer fixing part 10, the balance and the stable holding function of the transformer 2 can be obtained.
(4) Since the transformer fixing portion 10 is configured to be fastened to the mounting base 6 protruding on the housing 1, the mounting work is performed when a large number of parts are arranged in a limited space like an electronic part unit. Becomes easy.
(5) By adopting a method in which the mounting member 3 is mounted in advance at the manufacturing factory of the transformer 2, a conventional transformer holding means such as tape winding becomes unnecessary, and the transformer 2 is formed on the lower surface of the lower core 8. The entire surface of 8a can be brought into contact with the housing 1, and the heat dissipation action can be performed satisfactorily.

(Second Embodiment)
The second embodiment shown in FIG. 6 is obtained by changing the mounting member 3 in the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. .

  The structure of the transformer fixing part 10, the transformer holding parts 11, 12 and the connection parts 13, 14 in the mounting member 25 of the second embodiment is the same as that of the first embodiment. In the mounting member 25, an upper core holding part 26 extending in a substantially right angle direction is integrally formed with the upper surface contact part 19 of the transformer holding part 11. The end portion of the upper core holding portion 26 is bent downward to form a front contact portion 27 that contacts the front surface 7b of the upper core 7. On the other hand, the upper surface contact portion 22 of the transformer holding portion 12 is integrally molded with an upper core holding portion 28 that extends in a right angle direction, and its end portion is bent downward to contact the rear surface 7c of the upper core 7. 29 is formed.

  When the mounting member 25 is attached to the transformer 2, the front contact portion 27 of the upper core holding portion 26 is in close contact with the front surface 7 b of the upper core 7 by its own elastic restoring force, and the rear contact portion 29 of the upper core holding portion 28 is the upper core. 7, the position of the upper core 7 is fixed in close contact with the rear surface 7c. Therefore, in the second embodiment, the pair of upper core holding portions 26 and 28 is combined with the close contact action of the transformer 2 by the transformer fixing portion 10 and the transformer holding portions 11 and 12 to the upper and lower surfaces and both side surfaces of the transformer 2. The holding function can be further enhanced.

(Third embodiment)
The third embodiment shown in FIG. 7 is obtained by changing the mounting member 25 in the second embodiment. The same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. .

  The attachment member 30 in the third embodiment includes an upper core side surface holding portion 31 and a lower core side surface holding portion between the transformer fixing portion 10 and the transformer holding portion 11 and between the transformer fixing portion 10 and the transformer holding portion 12. In this configuration, the unit 32 is arranged. The upper core side surface holding portion 31 extends from the connecting portion 13 to both sides to form an upper surface contact portion 33, and further includes a side surface contact portion 34 that hangs down from both sides of the upper surface contact portion 33 and contacts the side surface 7 d of the upper core 7. Forming. The lower core side surface holding portion 32 extends from the connection portion 14 to both sides to form an upper surface contact portion 35, and is suspended from both sides of the upper surface contact portion 35 to contact the side surface 8 b of the lower core 8. Is forming.

  When the mounting member 30 is attached to the transformer 2, the upper surface contact portion 33 of the upper core side surface holding portion 31 and the upper surface contact portion 35 of the lower core side surface holding portion 32 are brought into close contact with the upper surface 7 a of the upper core 7 by its own elastic restoring force. The Further, the side surface contact portion 34 of the upper core side surface holding portion 31 is in close contact with the side surface 7 d of the upper core 7, and the side surface contact portion 36 of the lower core side surface holding portion 32 is in close contact with the side surface 8 b of the lower core 8. For this reason, the upper core side surface holding portion 31 and the lower core side surface holding portion 32 can fix the positions of the pair of upper and lower cores 7 and 8 in the side surface direction. In particular, in the transformer 2, it is difficult to directly hold the front and rear surfaces of the upper and lower cores 8. Therefore, in the third embodiment, the upper core side surface holding portion 31 and the lower core side surface holding portion 32 are provided on the transformer 2 by the transformer fixing portion 10, the transformer holding portions 11, 12 and the pair of upper core side holding portions 26, 28. The holding function of the transformer 2 can be further enhanced in combination with the adhesion to the lower surface, both side surfaces, and the front and rear surfaces.

  In the third embodiment, the upper core side surface holding part 31 can be supplemented by the pair of upper core side holding parts 26 and 28, and can be deleted. If at least the lower core side surface holding portion 32 is formed, the holding function of the transformer 2 can be enhanced.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) In each of the above-described embodiments, the attachment arm portion 16 of the transformer fixing portion 10 can be formed long and the attachment portion 17 can be directly fixed to the upper surface of the housing 1.
(2) In the first embodiment, the attachment member 3 may be configured only by the transformer fixing part 10 and the transformer holding part 11 without the transformer holding part 12.

It is an exploded view of the transformer mounting apparatus in 1st Embodiment. It is a front view of a transformer attachment apparatus. It is a top view of a transformer attachment apparatus. FIG. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is an exploded view of the transformer mounting apparatus in 2nd Embodiment. It is an exploded view of the transformer attachment apparatus in 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Transformer 3, 25, 30 Mounting member 7 Upper core 8 Lower core 9 Coil bobbin 10 Transformer fixing part 11, 12 Transformer holding part 13, 14 Connection part 15 Upper surface pressing part 16 Mounting arm part 19, 22, 33, 35 Upper surface contact portion 20, 23, 34, 36 Side contact portion 21, 24 Lower surface contact portion 26, 28 Upper core holding portion 27 Front contact portion 29 Rear surface contact portion 31 Upper core side surface holding portion 32 Lower core side surface holding portion

Claims (5)

In a transformer mounting apparatus in which a transformer holding a coil bobbin between a pair of upper and lower cores is fixed to a metal housing by an elastic mounting member,
A transformer fixing portion having a U-shaped cross section is formed by an upper surface pressing portion that presses the upper surface of the upper core and an attachment arm portion that hangs down from both sides of the upper surface pressing portion.
The upper surface contact portion that contacts the upper surface of the upper core, the side surface contact portion that contacts the upper and lower cores and hangs down from both sides of the upper surface contact portion, and bends from the lower end of the side surface contact portion toward the lower surface side of the lower core. The transformer holding part formed by the lower surface contact part is arranged in parallel with the transformer fixing part,
The upper surface pressing part of the transformer fixing part and the upper surface contact part of the transformer holding part are connected by a connection part,
The transformer mounting device, wherein the mounting member is constituted by the transformer fixing portion, the transformer holding portion, and the connection portion.   The transformer mounting device according to claim 1, wherein the transformer holding part is disposed on both sides of the transformer fixing part.   The upper surface contact portion of each transformer holding portion is provided with an upper core holding portion extending in a direction perpendicular to the direction in which the upper surface contact portion extends, and one upper core holding portion is in contact with the front surface of the upper core. The transformer mounting device according to claim 2, wherein a rear surface contact portion that contacts the rear surface of the upper core is formed on the other upper core holding portion.   A lower core side surface holding part is disposed in parallel with the transformer fixing part or the transformer holding part, and the lower core side surface holding part is suspended from both sides of the upper surface contact part and the upper surface contact part that contact the upper surface of the upper core. 4. The transformer mounting device according to claim 1, wherein the transformer mounting device is formed by a side surface contact portion that contacts a side surface of the lower core.   The transformer according to any one of claims 1 to 4, wherein a mounting base protruding upward is formed on the housing, and a mounting arm portion of the transformer fixing portion is screwed to the mounting base. Mounting device.

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