JP5483728B2 - Coil holding structure - Google Patents

Description

  The present invention relates to a coil holding structure for holding a relatively large coil in various electric devices.

  Conventionally, coils have been used in various electrical devices for noise removal and the like. Coils have various characteristics and shapes. For example, if the noise to be removed is common mode noise and the mounting area is to be minimized, a vertical choke coil should be used. There are many (for example, refer nonpatent literature 1).

  As shown in FIG. 4, a conventional vertical choke coil (hereinafter simply referred to as “coil”) 20 includes a pedestal portion 21 that is firmly fixed to the mounting substrate 3 by fixing means such as screws, bolts, and adhesives. The coil main body 22 provided on the pedestal 21 and the partition plate 26 are provided. The coil main body 22 includes a core 25 composed of a donut-shaped ferrite core and a cover thereof, and a pair of windings 23 and 24 wound around the core 25. The partition plate 26 is a plate-like member that extends from the pedestal portion 21 through the hollow portion of the core 25, and separates the winding 23 and the winding 24.

  As shown in the figure, the windings 23 and 24 have winding start ends 23a and 24a, respectively, and the winding start ends 23a and 24a are inserted into through holes provided in the mounting substrate 3 and mounted by soldering or the like. It is electrically connected to the circuit of the substrate 3. Each of the windings 23 and 24 also has a winding end (not shown). Each winding end is also inserted into a through hole provided in the mounting substrate 3 and electrically connected to a circuit of the mounting substrate 3 by soldering or the like.

  The mounting substrate 3 and the coil 20 are accommodated in a case (not shown) (an outer case of an electric device). Further, the mounting substrate 3 is firmly fixed inside the case by fixing means such as screws, bolts, and solder.

“Choke Coil”, Mitsubishi Electric Metex Co., Ltd., Internet, <http://www.metecs.co.jp/jp/products/seihin/coil/coil002.pdf>, p. 1, as of October 25, 2010

  Incidentally, electrical equipment mounted on automobiles and the like is required to have higher vibration resistance than stationary electrical equipment. Accordingly, when the coil 20 is used in such an electrical device, naturally, high vibration resistance is also required for the coil 20 itself and the holding structure of the coil 20.

  However, the coil 20 used in an electric device such as an automobile is generally large, and the coil main body 22 including the core 25 and the windings 23 and 24 has a considerable weight. For this reason, when strong vibration is repeatedly applied, the conventional coil 20 may be broken at the base portion of the coil body portion 22 (the boundary portion between the coil body portion 22 and the pedestal portion 21). For the same reason, the conventional coil 20 has a burden on the connection portion between the windings 23 and 24 and the mounting substrate 3, and the portion may be deformed.

  This invention is made | formed in view of the said situation, The place made into the subject is providing the coil holding structure excellent in vibration resistance.

In order to solve the above problems, a coil holding structure according to the present invention is a coil holding structure having a pedestal portion fixed on a mounting substrate and a coil main body portion provided on the pedestal portion, And a support portion provided on the upper portion of the coil main body and extending in a direction away from the mounting substrate. The holding structure includes a holding means for holding the support portion and a case for accommodating the coil and the mounting substrate. A holding means for holding the tip of the support portion against the lid portion; a holding means for sealing the opening portion; and a lid portion for sealing the opening portion. It is characterized by.

In this configuration, the pedestal portion of the coil is fixed to the mounting substrate, and the tip of the support portion of the coil is held against the lid portion by the holding means. That is, the coil is held and fixed at two locations, that is, a pedestal portion located in the lower portion and a support portion tip located in the upper portion. Therefore, according to this configuration, the resonance frequency of the coil mounted on the mounting substrate can be increased by increasing the resonance frequency.

  The holding means in the coil holding structure may be (1) an adhesive interposed between the lid and the tip of the support, or (2) provided on either the tip or the lid. It may be configured such that the supporting portion is held by the lid portion by fitting the protruding portion and the recessed portion.

  Moreover, it is preferable that the support part in the said coil holding structure is a reinforcement board extended through the coil main-body part from the base part, in order to improve vibration resistance.

  The coil body in the coil holding structure has a core divided into two regions by a reinforcing plate and two windings wound around each of the two regions of the core. Each of the lines is formed with a winding portion wound around the core, and a detour portion processed so as to draw a loop in the air between the winding portion and the connection end portion connected to the mounting substrate. Is preferred.

  According to this configuration, the circuitous portion functions as a cushioning material that reduces the burden on the connection portion between the two windings and the mounting substrate, so that the portion can be prevented from being deformed.

  ADVANTAGE OF THE INVENTION According to this invention, the coil holding structure excellent in vibration resistance can be provided.

It is a fragmentary sectional view showing an example of the coil holding structure concerning the present invention. It is a coil hold | maintained by this invention, Comprising: (A) is a perspective view, (B) is a front view, (C) is a side view. It is a figure which shows the modification of the holding means in this invention. It is a perspective view which shows the conventional coil mounting state.

  Preferred embodiments of a coil holding structure according to the present invention will be described below with reference to the accompanying drawings.

  First, the overall configuration of the coil holding structure according to the present invention will be described with reference to FIG. The coil holding structure 1 is, for example, for holding the coil 2 in an automobile electrical device. As shown in the figure, the coil holding structure 1, the coil 2 fixed on the mounting board 3, and the mounting board 3 are mounted. And a case 4 for housing the coil 2. The case 4 has a height that can accommodate the mounting substrate on which the coil 2 is mounted, and has an opening on the upper surface. The opening is sealed by the lid 7.

  The coil 2 is a vertical choke coil, a pedestal portion 10 that is firmly fixed to the mounting substrate 3 by fixing means such as screws, bolts, adhesive, and the like, and a coil main body portion 11 provided on the pedestal portion 10; A reinforcing plate 12 having a tip portion held and fixed to the lid portion 7 of the case 4 by an epoxy adhesive 5 is provided. The adhesive 5 is interposed between the lid portion 7 and the distal end portion (upper end portion) of the reinforcing plate 12 to hold and fix the coil 2 to the lid portion 7. The adhesive 5 corresponds to the “holding means” of the present invention. The reinforcing plate 12 corresponds to the “supporting portion” of the present invention.

  In addition to the coil 2, various components constituting the electrical device are mounted on the mounting substrate 3. The case 4 plays a role of protecting components such as the mounted substrate 3 and the coil 2 accommodated therein. Examples of the material of the case 4 include PPS (Polyphenylene sulfide) and PBT (polybutylene terephthalate), which are excellent in workability, robustness, and durability. The mounting substrate 3 and the case 4 are firmly fixed by substrate fixing means 6 such as screws, bolts, and solder.

  Next, a more detailed configuration of the coil 2 will be described with reference to FIG.

The coil main body 11 includes a core 15 composed of a donut-shaped ferrite core and a cover thereof, and a pair of windings 13 and 14 wound around the core 15. As shown in the figure, the coil main body 11 is divided into two regions 11a and 11b by a reinforcing plate 12 to be described later. Windings 14 are respectively wound. Depth dimension of the core 15 is _{D 15} (see FIG. 2 (C)).

The reinforcing plate 12 is a plate-like member that extends from the pedestal portion 10 through the hollow portion of the core 15 and extends directly upward (in a direction away from the mounting substrate 3), and has a distal end that protrudes upward from the coil body portion 11 Has a part. Depth of the reinforcing plate 12 is _{D 12,} which is greater than the depth _{D 15} of the core 15 (see FIG. 2 (C)). The depth D ₁₂ is made larger than D _15, swinging the core 15 in the depth direction, it is possible to root portion of the core 15 can be inhibited from breaking.

  The base part 10, the reinforcing plate 12, and the cover of the core 15 are all made of PPS or PBT. From the viewpoint of enhancing the vibration resistance of the coil 2, it is preferable that the base portion 10, the reinforcing plate 12, and the cover of the core 15 are integrally formed by, for example, injection molding of PPS.

  The windings 13 and 14 have winding start ends 13a and 14a, respectively. The winding start ends 13a and 14a are inserted into through-holes provided in the mounting board 3, and are electrically connected to the circuit of the mounting board 3 by soldering or the like. Connected to. The windings 13 and 14 also have winding end ends 13b and 14b (not shown). The winding end ends 13b and 14b are also inserted into through holes provided in the mounting substrate 3, and are electrically connected to the circuit of the mounting substrate 3 by soldering or the like.

  Further, the windings 13 and 14 have detour portions 13c and 14c, respectively. One detour portion 13c is provided between the winding portion wound around the core 15 of the winding 13 and the winding start end 13a and the winding end end 13b. Further, one detour portion 14c is provided between a portion of the winding 14 wound around the core 15 and a winding start end 14a and a winding end end 14b (not shown). The detour portions 13c and 14c are processed so as to draw a loop in the air between the winding portion and the connection end portions (the winding start ends 13a and 14a and the winding end ends 13b and 14b) connected to the mounting substrate 3. When the main body 11 is shaken, it acts as a buffer material, which reduces the burden on the connecting portion between the windings 13 and 14 and the mounting substrate 3.

  In summary, in the coil holding structure 1 according to the present invention, the pedestal portion 10 of the coil 2 is fixed to the mounting substrate 3, and the tip of the reinforcing plate 12 of the coil 2 is held and fixed to the lid portion 7 of the case 4. ing. That is, the coil 2 is held and fixed at two places, that is, the pedestal 10 positioned at the lowermost portion and the tip of the reinforcing plate 12 positioned at the uppermost portion. Therefore, according to this configuration, it is possible to increase the resonance frequency and improve the vibration resistance.

  Further, according to the coil holding structure 1 according to the present invention, the windings 13 and 14 have the detour portions 13c and 14c, respectively. Since it functions as a cushioning material that reduces such a burden, the portion can be prevented from being deformed.

  The preferred embodiments of the coil holding structure according to the present invention have been described above, but the present invention is not limited to these configurations.

  For example, the holding means 5 is not limited to an adhesive, and has a convex portion provided on one side of the front end portion of the reinforcing plate 12 and the lid portion 7 and a concave portion provided on the other side. The reinforcing plate 12 may be held by the lid portion 7 by fitting the concave portion.

  As a specific example, in the holding means 5 </ b> A shown in FIG. 3A, a hole 8 </ b> A (concave portion) that can be engaged with the distal end portion (convex portion) of the reinforcing plate 12 itself is provided in the lid portion 7. Further, in the holding means 5B shown in FIG. 3B, a groove 8B (concave portion) that can be engaged with a protrusion (convex portion) provided on the lid portion 7 is provided at the distal end portion of the reinforcing plate 12. As the cross-sectional shapes of the convex portion and the concave portion, various modifications as shown in FIGS. 3C to 3D can be considered. In addition, when the front-end | tip part itself of the reinforcement board 12 has convex shape, it is not necessary to provide a convex part in a front-end | tip part. In other words, in the present invention, the “tip portion provided at the tip portion” includes the tip portion itself.

  In addition, as the holding means 5, the support portion may be held by pressing the support portion of the coil 2 toward the mounting substrate 3 with an elastic member such as a leaf spring. In this case, an elastic member such as a leaf spring may be provided on the back side of the lid portion 7.

  Further, the detour portions 13c and 14c only need to include a portion that proceeds in a direction different from the direction toward the mounting substrate 3, and are not limited to the shapes illustrated in FIGS.

DESCRIPTION OF SYMBOLS 1 Coil holding structure 2 Coil 3 Mounting board 4 Case 5 Holding means 6 Board fixing means 7 Lid part 10 Base part 11 Coil main-body part 12 Reinforcement board (support part)
13, 14 Winding 13a, 14a Winding start end 13b, 14b Winding end 13c, 14c Detour 15 core

Claims (5)

A coil holding structure having a pedestal portion fixed on a mounting substrate and a coil main body provided on the pedestal portion,
The coil further includes a support portion provided on the upper portion of the coil main body portion and extending in a direction away from the mounting substrate.
Holding means for holding the support part ;
A case having an opening and accommodating the coil and the mounting substrate;
Substrate fixing means for fixing the mounting substrate to the case;
A lid for sealing the opening;
With
The coil holding structure , wherein the holding means holds a tip portion of the support portion against the lid portion . The coil holding structure according to claim 1 , wherein an adhesive is interposed as the holding means between the lid portion and a tip portion of the support portion. The holding means has a convex portion provided on one of the tip portion of the support portion and the lid portion and a concave portion provided on the other, and the convex portion and the concave portion are fitted to each other. The coil holding structure according to claim 1 , wherein the support portion is held by the lid portion. The coil holding structure according to any one of claims 1 to 3 , wherein the support portion is a reinforcing plate that extends from the pedestal portion through the coil main body portion. The coil main body has a core divided into two regions by the reinforcing plate, and two windings wound around each of the two regions of the core,
Each of the two windings includes a winding portion wound around the core, and a circuitous portion processed so as to draw a loop in the air between the winding portion and a connection end portion connected to the mounting substrate. And the coil holding structure according to claim 4 .

Images