JPH0745458A - Toroidal coil - Google Patents

Abstract

PURPOSE:To provide a toroidal coil having such structure as realizing a highly reliable product at low cost by securing the core and the winding positively in the case without requiring any adhesive while ensuring the insulation thereof and securing the cover and the case positively in a short time. CONSTITUTION:Saw-tooth indentations 13, 6 are provided at the engaging parts of a case 11 and a cover 5. Grooves and protrusions are provided, respectively, in the inner peripheral surface of the case 11 and on the outer peripheral surface of the cover 5 between the indentations 13, 6. The saw-tooth indentations 13, 6 are meshed each other to fit the protrusions in the grooves thus securing a core 4 and a winding 2 in the case 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal coil having a toroidal core and relates to its structure.

[0002]

2. Description of the Related Art A conventional toroidal coil 17 of this type.
3 is a cross-sectional view thereof in FIG. 3, and an assembled and disassembled state is shown in FIG. 4, in which a bottomed cylindrical case 11 is provided with an annular recess 12 on the inner peripheral surface near the opening 18. In the structure surrounded by the plate-shaped lid 5 having a size that fits in the groove-shaped recess 12 of the case 11, the coil 1 having the winding 2 wound around the outer periphery of the toroidal core 4 is fixed. is there. A lead wire insertion hole 7 for drawing out the lead wire 3 is formed in the lid 5 in a penetrating manner. Also, if necessary, mounting pins 19 for mounting and standoffs 10 are mounted on the outer surface. In this conventional structure, the coil 1 in the case 11 is
However, the adhesive 15 is fixed to the inner surface of the case 11 and the inside of the lid 5 so that the lead wire 3 does not rattle and the lead wire 3 does not float up. If the thickness of the lid 5 is large, the outer peripheral portion 8 of the lid 5 is partially stepped as shown in FIGS. 3 and 4,
Only part of the outer peripheral portion 8 in the thickness direction is fitted so that it can be securely fixed.

However, in the case of such a structure, the adhesive 1
5 is used, so bad adhesion or forgetting, or
Solder failure or the like due to the flow of the adhesive is likely to occur, which deteriorates the quality. Further, since the lid 5 is fixed by fitting the lid 5 in the recess 12 of the case 11 over the entire outer periphery of the lid 5,
It is difficult to fit them completely, and they are often fixed in an incompletely fitted state, which causes a problem of lowering reliability. Further, since the adhesive 15 is used, there is a problem that it takes time to apply and dry the adhesive, productivity is lowered, material cost of the adhesive is increased, and cost is increased. There was a problem that it tended to get worse. Further, in the conventional structure, the bottom 1 of the case 11 is
Since the directions of the labels and the like described on the outer side of the 6th surface and the direction of the lead wire 3 cannot be made constant, there is a problem that the appearance of the product is deteriorated when mounted and the workability in quality control is poor.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to securely fix the core and the winding in the case without using an adhesive to ensure the insulation of the core and the winding. The purpose of the present invention is to provide a toroidal coil having a structure in which the lid and the case can be reliably and easily fixed in a short time, and a highly reliable and inexpensive product can be obtained.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides claws having a saw-tooth cross section at each engaging portion of a case and a lid, and an inner peripheral surface of the case and an outer periphery of the lid. A toroidal coil having a structure in which a groove and a convex portion are provided between the claws, the serrated claw and the claw are engaged with each other, and the groove and the convex portion are fitted to fix the coil in the case is provided.

That is, according to the present invention, (1) in a space formed by a bottomed cylindrical case made of a flexible insulating resin and a plate-shaped lid fitted in the opening of the case, In a toroidal coil in which a coil with a wound wire is built in a toroidal core, a plurality of claws having a serrated cross section are continuously processed on the inner peripheral surface on the opening side of the case, and A case having a structure in which a plurality of grooves are formed in the depth direction of the cylinder on the peripheral surface, and a claw having a serrated cross section that engages with a claw of the case with an outer shape that fits in the opening of the case A lead for drawing a coil lead wire is provided on the outer peripheral portion, and at a position corresponding to the groove of the case, a convex portion having a size that fits in the groove of the case is processed. Using a lid with a structure with a wire insertion hole penetrating through The lid is fitted into the opening of the case in which the coil with the winding wound on the toroidal core is built into the case, and the claw of the case is meshed with the claw of the lid to remove the coil in the case. A toroidal coil characterized by a fixed structure, and (2) In the toroidal coil described above, a lead wire insertion hole for drawing out a lead wire of the coil is provided at a bottom of the case so as to penetrate the case. It is a toroidal coil characterized by being used.

[0007]

In contrast to the conventional structure in which the recess on the inner surface of the case and the outer periphery of the lid are fitted together over the entire surface, the groove is provided in the depth direction (vertical direction) of the case and the projection of the lid is divided into a plurality of parts. Since the claws are engaged with each other, the engagement is easy and reliable. Further, the direction of the case and the combination direction of the lid can be fixedly combined by the groove and the convex portion provided in the vertical direction. In addition, since there are multiple claws with a saw-tooth cross section, you can push the core and winding down until they are firmly held in place, and you can fix the core and winding in an insulating case without using adhesive. Insulation protection of the toroidal coil can be secured at low cost.

[0008]

【Example】

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a toroidal coil according to an embodiment of the present invention, and FIG. 1 (a) is a front view showing a cross section.
FIG. 1B is an enlarged cross-sectional view showing an enlarged portion A of FIG. FIG. 2 is an assembly exploded perspective view for explaining the structure of the toroidal coil according to the embodiment of the present invention.

As shown in FIGS. 1 and 2, the toroidal coil of the present invention has a coil 1 having a toroidal core 4 and a winding 2, and an insulating resin case 11 for accommodating the coil 1.
And an insulating resin lid 5.

In the coil 1, a magnetic or non-magnetic toroidal core 4 is wound around the outer periphery of a conductor wire which has been subjected to an insulation treatment as a predetermined number of turns as a winding wire 2. The tip of the winding wire 2 is drawn out as a lead wire 3 outside the coil in the axial direction of the toroidal coil.

The case 11 is made of a flexible insulating resin. The case 11 has a cylindrical shape, and one end thereof is closed by a bottom 16 surface integrally machined. The other end is the opening 18 in the released state. On the inner peripheral surface of the opening 18, three grooves 14 are processed in a U shape in the depth direction. In addition, a plurality of laterally long claws 13 are processed in the circumferential direction between the grooves 14. The claw 13 is processed into a shape whose cross section is a right triangle with respect to the side wall of the case. Further, in this embodiment, the claws are arranged such that the right-angled surface of the right triangle is on the inner side of the case.

The lid 5 is made of a flexible insulating resin and is a circular plate in the shape of the opening 18 of the case 11, and has a through hole (lead wire insertion hole) at a position corresponding to the position of the lead wire 3 of the coil 1 to be attached. 7) is processed. A U-shaped convex portion 9 is provided on the outer peripheral portion of the disk in the thickness direction of the lid 5 so as to correspond to the position of the groove 14 of the case 11. In addition, the convex portion 9 and the convex portion 9
A claw 6 having a shape that fits between claws 13 of the case 11 is processed on the outer peripheral portion between the claws.

The insertion of the coil 1 into the case 11 and the engagement and fixing of the case 11 and the lid 5 are performed by inserting the lead wire 3 of the coil 1 into the lead wire insertion hole 7 of the lid 5, as shown in FIGS. Then, insert the coil 1 through the opening 18 of the case 11.
The lid 5 is pushed in, the coil 1 is pressed against the bottom 16 of the case 11, and the lid 5 is forcibly pushed in the case 11 to such an extent that the coil 1 does not move even by a predetermined amount of vibration or acceleration due to an external force. Since the lid 5 and the case 11 have flexibility, they are forcibly pushed in so that the claws 6 and 13 engage with each other at a deeper position and are fixed so as not to return. In this embodiment, since the shape of the claws 6 and 13 is a right triangle, when the lid 5 is pushed into the case 11 as shown in the enlarged sectional view of FIG. The slopes of each claw slide against each other and engage with the next claw, resulting in resistance between the slopes. Conversely, when moving in the direction to remove the lid 5, right angled faces are in contact with each other, resulting in a large resistance. Has become. Therefore, in the case of the nail of the structure of the present embodiment, it can be easily pushed in and is hard to come off, so that it can be assembled easily and securely, and furthermore, it can be assembled in a short time because no adhesive is used. The direction of the pin arrangement of the assembled toroidal coil 17 is the case 11.
The direction automatically coincided with the marking on the board, and when mounted on a board, the parts could be inspected easily and a reliable product was obtained.

(Embodiment 2) In Embodiment 1, FIG.
As shown in FIG. 2, the lead wire 3 of the coil 1 was inserted into the lead wire insertion hole 7 provided in the lid 5 and pulled out to the lid 5 side. However, in the second embodiment, on the bottom surface of the case, A case having a structure in which penetrating lead wire insertion holes were provided at positions corresponding to the lead wires of the coil was prepared. Insert the coil lead wire into this lead wire insertion hole, pull out to the bottom side of the case, forcibly push the lid from the back of the coil from the opening end of the case, and engage the lid on the case to fix the coil inside the case. Fixed together. Also in this embodiment, the effect of the present invention was obtained similarly to the first embodiment. Further, in the second embodiment, especially with a thin coil, the lead wire can be easily inserted, and since the lead wire is not pulled out, the lid can be easily pushed in and the assembly can be efficiently performed. Also, the product name specification engraved on the lid part could be assembled in a certain direction with respect to the lead wire.

In the present embodiment, the shape of the engaging and fixing claw is a right-angled triangle with respect to the side wall surface of the case, so that it is easy to insert and difficult to remove. However, the required fixing strength and the lid are pushed in. Although the angle and number of each claw can be changed depending on the distance, the effect of the present invention does not change. Further, the shape and number of the groove provided in the case and the convex portion provided in the lid also need to be determined by the shape of the case, the required fixing strength, etc.
The effect of the present invention does not change even if the shape or number is changed. Further, although the example of the cylindrical case has been described, the same effect as that of the present embodiment can be obtained also in the case of a rectangular tube or an elliptic tube. Also, attach to the outer surface of the case bottom and the outer surface of the lid,
The effect of the present invention can be obtained in the same manner as in the first embodiment when the structure is such that the pins and standoffs are attached.

[0016]

As described above with reference to the embodiments, according to the present invention, the core and the winding are securely fixed in the case without using an adhesive, and the insulation of the core and the winding is secured. Moreover, it is possible to provide the toroidal coil having a structure in which the lid and the case can be reliably and easily fixed in a short time, and a highly reliable and inexpensive product can be obtained.

[Brief description of drawings]

1 shows a toroidal coil according to an embodiment of the present invention, and FIG.
1A is a front view showing a cross section, and FIG. 1B is an enlarged cross-sectional view showing an enlarged part A of FIG. 1A.

FIG. 2 is an exploded perspective view for explaining the structure of the toroidal coil according to the embodiment of the present invention.

FIG. 3 is a front view showing a cross section of an example of a conventional toroidal coil.

FIG. 4 is an exploded perspective view for explaining the structure of a conventional toroidal coil, FIG. 4 (a) showing the assembly of the coil;
FIG. 4B shows the assembly of the toroidal coil in a state where the coils are turned upside down, and FIG. 4C shows the assembled toroidal coil turned upside down.

[Explanation of symbols]

 1 Coil 2 Winding 3 Lead wire 4 Core 5 Lid 6 Claw (of lid) 7 Lead wire insertion hole 8 (of lid) outer peripheral portion 9 (of lid) convex portion 10 Standoff 11 Case 12 (of casing) Recessed portion 13 ( Claw 14 (Case) Groove 15 Adhesive 16 Bottom (Case) 17 Toroidal coil 18 Opening (Case) 19 Mounting pin

Claims (2)

[Claims] 1. A toroidal core is wound in a space formed by a bottomed cylindrical case made of a flexible insulating resin and a plate-shaped lid fitted in an opening of the case. In a toroidal coil including a coil provided with a coil, a plurality of claws having a sawtooth-shaped cross section are continuously formed on the inner peripheral surface of the opening side of the case, and the inner peripheral surface of the case has A case having a structure in which a plurality of grooves are processed in the depth direction, and a claw having a sawtooth-shaped cross section for engaging with a claw of the case with an outer shape that fits into the opening of the case is provided on the outer peripheral portion, and , At a position corresponding to the groove of the case, a convex portion having a size that fits in the groove of the case is processed, and a lead wire insertion hole for drawing out the lead wire of the coil is penetrated. Using the lid of the structure provided, toroidal shape in the case Characterized by a structure in which the lid is fitted into the opening of the case having a coil with a coil wound on the core, and the claw of the case and the claw of the lid are engaged with each other to fix the coil in the case. A toroidal coil. 2. The toroidal coil according to claim 1, wherein a case having a structure in which a lead wire insertion hole for drawing out a lead wire of the coil is provided at the bottom of the case is used. Toroidal coil.