JPH0745444A - Core case for toroidal coil having base - Google Patents

Abstract

PURPOSE:To enhance the dielectric strength by a structure wherein an insulating case body housing a toroidal core, a cover closing the opening of the vase body, and a base for fixing the case body can be split from each other and a desired insulation distance can be ensured between the winding part and a previously soldered lead wire. CONSTITUTION:A toroidal core is housed in an insulating vase body 2, a cover 3 is fitted thereto, a winding 1 is applied thereon, and then the assembly is fitted to a base 4. The insulating case body 2 has bottomed double tube structure wherein a partition board 6 projects by a predetermined length from the opposite ends of the inner tube while dividing the internal space equally into two sections by a plane parallel with the axis and a wide partition board 7 extends between the inner and outer tubes and jointed to the projecting parts of the partition board 6. Protrusions 9 for separating the winding 1 and leads 8 are formed on the opposite sides of the wide partitioning board 7. The outer tube of the insulating case body 2 is provided with a groove part 11 for positioning the base 4 with respect to the case, and a base part 15 for the case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal core core case for a common mode choke coil which is housed in a toroidal core, wound on the toroidal core, and then mounted on a pedestal.

[0002]

2. Description of the Related Art Most of choke coils for line filters of electronic parts and electronic devices are made by winding a ring-shaped ferrite core. A conventional toroidal coil with a pedestal of this type covers the inner and outer peripheral surfaces of a toroidal core with an annular lid 3 fitted into an opening of an insulating case body 2 of a bottomed concentric double cylindrical body as shown in FIG. The winding 1 is formed by a partition plate 6 provided on the inner cylinder of the insulating case body 2 and a wide partition plate 7 provided on the bottom surface of the insulating case body 2 and on the top surface of the lid 3 so as to be connected to the partition plate 6. A core insulating case having a split structure is used.

A toroidal core is housed in the insulating case main body 2, a lid 3 is fitted on the insulating case main body 2, a winding 1 is applied thereto, and then a lead wire is provided on a pedestal 4 formed integrally with the insulating case main body 2. A core case for a toroidal coil with a pedestal having a structure in which the lead wire 8 preliminarily soldered is fitted into the fixing groove 26 to fix the lead wire 8 has been used.

[0004]

In recent years, it has been necessary to carry out and pass an immunity test in electronic devices. As this immunity test condition, 50 nsec-
A square wave of 1 μsec applies a voltage of 500 V to 2000 V to 1
A method (impulse test) of injecting into the line of an electronic device for about 24 hours to confirm whether or not the electronic device malfunctions is used. Therefore, it is necessary for the choke coil used as the line filter of the electronic device to pass the impulse test.

In the conventional structure, since the lead wire 8 and the winding wire 1 approach or contact with each other, the withstand voltage of the contact portion between the lead wire 8 and the winding wire 1 is low, and the immunity test fails or insulation occurs. There is a problem that the device is adversely affected when the breakdown voltage is caused. Further, in the conventional toroidal coil core case, the winding 1 is difficult because the insulating case body 2 and the pedestal 4 are integrated.

An object of the present invention is to provide a choke coil used as a line filter of an electronic device by ensuring a desired insulation distance between a winding portion and a lead wire that has been pre-soldered, thereby ensuring a high dielectric strength. An object of the present invention is to provide a core case for a toroidal coil with a pedestal, which is improved in workability and is highly reliable by attaching the pedestal after dividing the pedestal and completing the toroidal winding. still,
It is also possible to use the toroidal coil in a vertical type and a horizontal type without a pedestal.

[0007]

The structure of the present invention for achieving this object is as shown in FIG.
A lead wire 8 pre-soldered on at least one side of at least one of the wide partition plates 7 provided on the bottom surface and the top surface of the lid 3.
Separate the lead-out part and the winding part for winding 1.
By dividing the pedestal 4 from the insulating case body 2, a desired pedestal-equipped toroidal coil core case can be realized.

That is, according to the present invention, in a toroidal coil having a toroidal core housed in an insulating case and having a toroidal winding, an insulating case body for housing the toroidal core and a lid for closing the opening of the insulating case body. A core case for a toroidal coil with a pedestal is obtained, which is composed of a pedestal to which an insulating case main body is attached and is configured to be divided.

The insulating case body is a double cylinder with a bottom, one side of which is open, and the inner cylinder is provided with a partition plate. The bottom surface of the insulating case body is connected to the partition plate and has a wide partition protruding from the outer peripheral portion. A core case for a toroidal coil with a pedestal is obtained, in which a plate is provided and separation projections for drawing out lead wires are provided on both sides of the wide partition plate.

A core case for a pedestal toroidal coil is obtained, in which an insulating case body pedestal having a recess and an engaging portion for positioning the pedestal is provided on the outer peripheral portion of the insulating case body.

The lid is an annular plate that closes the opening of the insulating case body of the core case for the toroidal coil, and has a wide partition with a groove on its upper surface that fits into the partition plate provided in the inner cylinder of the insulating case body. There is obtained a core case for a toroidal coil with a pedestal, characterized in that the plate is projected to the inner and outer peripheries, and separation projections for drawing out lead wires are provided on both sides of the wide partition plate.

The pedestal is characterized in that it has a positioning projection that fits into the positioning recess of the pedestal portion of the insulating case body, a lateral shift prevention portion of the insulating case body, and a locking claw that locks with the engaging portion. A core case for a toroidal coil with a pedestal is obtained.

A core case for a toroidal coil with a pedestal is obtained, in which a lead wire insertion hole for positioning the lead wire of the toroidal coil and a standoff are provided in the pedestal.

[0014]

According to the core case for a toroidal coil with a pedestal according to the present invention, as shown in FIG. 1, the separation projections 9 provided on both sides of the wide partition plate 7 provided on the bottom surface of the insulating case body 2 and the top surface of the lid 3 are provided. By separating the winding portion from the lead-out portion of the lead wire 8 by sandwiching the lead wire 8 between the wide partition plate 7 and the separation protrusion 9, the lead wire 8 does not come into contact with the winding wire 1 and it is sufficient. It is possible to secure a high withstand voltage, and it is possible to eliminate defective insulation withstand voltage.

Further, the pedestal 4 is separated, and after the winding 1 is completed, the pedestal 4 is connected to the insulating case body 2 so that the winding becomes easy and the working efficiency is improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description will be given below with reference to the drawings.

FIG. 1 shows an explanatory view of an assembly of a core case for a toroidal coil with a pedestal of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a side view, and FIG. 1 (c) is a bottom view. It is a figure.

In FIG. 1, a core case for a toroidal coil with a pedestal accommodates a toroidal core (not shown) in an insulating case body 2, fits a lid 3, and then a winding 1 (two-dot chain line) from above. The shape of the core case for a toroidal core with a pedestal will be described below with reference to FIGS. 2, 3, and 4.

FIG. 2 shows an explanatory view of the insulating case body 2 of the core case for a toroidal coil with a pedestal of the present invention.
2A is a front view, FIG. 2B is a side view, and FIG. 2C is a bottom view.

In FIG. 2, the inner cylinder of the insulating case body 2 of the bottomed double cylindrical body having the core housing portion 5 for housing the toroidal core and having an opening on one side has a surface parallel to the axis in its inner space. A partition plate 6 which is divided into two parts and which is projected for a required length from both ends of the inner cylinder is integrally formed. Further, a wide partition plate 7 which is connected to the protruding portion of the partition plate 6 and which is connected from the inner cylinder to the outer cylinder is integrally formed on the bottom surface.

The partition plate 6 projects from the inner and outer cylinders of the opening of the insulating case body 2, and the wide partition plate 1 of the lid 3 described later.
The case 2 and the lid 3 are joined by fitting in the concave groove portion 16 of 7.

Separation protrusions 9 for separating the winding 1 and the pre-soldered lead wire 8 (shown in FIG. 1) are provided on both sides of the wide partition plate 7 either integrally with the insulating case body 2 or by retrofitting. Has been formed.

Further, the outer casing of the insulating case body 2 is provided with a positioning groove 11 into which a case positioning projection 10 (shown in FIG. 4) of the pedestal 4 fits, and a fall prevention claw 12 of the pedestal 4.
An insulating case body pedestal 15 provided with a pedestal protrusion engaging portion 14 for locking the pedestal protrusion 13 (shown in FIG. 4) is integrally formed. It has a structure in which the main body 2 and the pedestal 4 are fitted and connected.

FIG. 3 shows an explanatory view of the lid 3 of the core case for a toroidal coil with a pedestal of the present invention. FIG. 3 (a) is a front view, FIG. 3 (b) is a side view, and FIG. 3 (c) is a bottom view. It is a figure.

In FIG. 3, the lid 3 is an annular plate that fits into the upper opening between the inner cylinder and the outer cylinder of the insulating case body 2 and closes the double cylindrical space portion, and the upper surface thereof has the insulating case. Body 2
At the positions corresponding to both ends of the protruding portion of the partition plate 6 on the opening side of the, the same width as the width of the bottom wide partition plate 7 that fits with the end of the partition plate 6 and has the same height as the protruding height. The partition plate 17 is integrally formed.

The wide partition plate 17 has a protruding portion 23 and a protruding portion 2 protruding in the inner and outer peripheral directions of the annular plate portion 22.
4, the inner peripheral protruding portion 23 is provided with a concave groove portion 16 for fitting both end portions of the protruding portion of the partition plate 6.

Further, windings 1 are provided on both sides of the wide partition plate 17.
A separation protrusion 19 for separating the lead wire 8 (shown in FIG. 1) that has been pre-soldered is formed on the lid 3 integrally or by retrofitting.

When the lid 3 and the insulating case body 2 are fitted together,
The annular plate portion 22 of the lid 3 is the core storage portion 5 of the insulating case body 2.
And the wide partition plate 17 on the inner and outer circumferences of the annular plate portion 22.
Inner peripheral side protruding portion 23 and outer peripheral side protruding portion 2
The toroidal core is housed by being locked by the edges of the inner and outer cylinders of the insulating case body 2 by 4 and acting as a lid of the insulating case body 2.

FIG. 4 is an explanatory view of the pedestal 4 of the core case for a toroidal coil with a pedestal of the present invention. FIG. 4 (a) is a plan view, FIG. 4 (b) is a front view, and FIG. 4 (c) is a side view. Figure, Figure 4
(D) is a bottom view.

In FIG. 4, the pedestal 4 is attached to the pedestal projection engaging portion 14 of the insulating case body 2 to prevent the cap 1 from falling off.
A substantially H shape having two pedestal protrusions 13 having two, and both ends of the insulating case body 2 are raised by one step in the center to prevent displacement of the insulating case body 2, and a lateral displacement preventing portion 18 for preventing lateral displacement. The positioning convex portion 10 having the above shape is provided so as to be fitted into the positioning concave portion 11 of the insulating case body 2. The insulating case main body pedestal portion 15 is locked between the lateral shift prevention portions 18 provided on the pedestal 4 while being fitted to the pedestal 4.

Further, in the pedestal 4, an insertion hole 20 for inserting the lead wire 8 separated by the separation projections 9 and 19 provided on the insulating case body 2 and the lid 3 and a standoff 2 are inserted.
1 is provided inside the pedestal protrusion 13, and when the fall prevention claw 12 of the pedestal 4 is locked to the pedestal protrusion engagement portion 14 of the insulating case body 2, the distance between the two pedestal protrusions 13 is increased. A piercing hole 25 that imparts elasticity to the pedestal 4 is integrally formed for easy opening.

The toroidal core is inserted into the insulating case body 2 described above, and the separation protrusions 19 are provided on both sides of the wide partition plate 17.
After fitting the lid 3 provided with the wire 3, the winding 1 is applied as shown by the dotted line in FIG. 1, and the lead wire 8 preliminarily soldered is sandwiched between the wide partition plate 17 and the separation protrusion 6. Winding 1
And the lead wire 8 can be completely separated.

Further, the positioning projection 10 of the pedestal 4 is fitted in the positioning groove 11 provided in the insulating case pedestal 15 of the insulating case main body 2, and the projection 4 of the pedestal 4 is attached to the pedestal projection engaging portion 14. The insulating case main body 2 and the pedestal 4 are coupled by fittingly locking the pedestal protrusion 13 having the.

As described above, in the toroidal coil with the pedestal, as described in FIG. 1, the toroidal core (not shown) is housed in the insulating case body 2 having the pedestal portion 15 of the insulating case body, and the lid 3 is fitted thereon. To winding 1 (indicated by the chain double-dashed line)
The lead wire 8 is pre-soldered, and the insulating case body pedestal 15 and the pedestal 4 are joined together to complete the process.

[0035]

As described above, according to the core case for a toroidal coil with a pedestal of the present invention, the winding portion and the pre-soldering are performed by the wide partition plate and the separation protrusions provided on both sides of the wide partition plate. It was possible to secure a sufficient breakdown voltage without contact with the lead-out portion of the lead wire, and it was possible to eliminate the breakdown voltage failure.

Further, the winding is performed with the pedestal removed, and after the winding is completed, the insulating case body and the pedestal are connected to each other, so that the winding can be facilitated and the working efficiency can be improved.

Furthermore, by removing the pedestal and using it, the structure can be easily changed from a pedestal type with a pedestal to a winding type without a pedestal, and two types of core cases for toroidal coils with common parts are used. Can be provided. The winding type with the pedestal removed can also be used as a vertical type in which a toroidal coil is erected and used horizontally as a horizontal type.

[Brief description of drawings]

FIG. 1 is an explanatory view of an assembly of a core case for a toroidal coil with a pedestal of the present invention, FIG. 1 (a) is a front view and FIG.
1B is a side view, and FIG. 1C is a bottom view.

2A and 2B are explanatory views of an insulating case body 2 of a core case for a toroidal coil with a pedestal of the present invention, FIG. 2A is a front view, FIG. 2B is a side view, and FIG. Fig.

FIG. 3 shows an explanatory view of a lid 3 of a core case for a toroidal coil with a pedestal of the present invention, FIG. 3 (a) is a front view, and FIG.
3B is a side view and FIG. 3C is a bottom view.

FIG. 4 is an explanatory view of a pedestal 4 of the core case for a toroidal coil with a pedestal of the present invention, FIG. 4 (a) is a plan view, and FIG.
4B is a front view, FIG. 4C is a side view, and FIG. 4D is a bottom view.

FIG. 5 is a perspective view showing a state in which a conventional toroidal coil core case with a base is wound.

[Explanation of symbols]

 1 Winding 2 Insulation case body 3 Lid 4 Pedestal 5 Core storage part 6 Partition plate 7,17 Wide partition plate 8 Lead wire 9,19 Separation protrusion 10 Positioning protrusion 11 Positioning recess 12 Fall prevention claw 13 Pedestal protrusion 14 Base protrusion Part Engagement part 15 Insulation case main body pedestal part 16 Recessed groove part 18 Side slip prevention part 20 Insertion hole 21 Standoff 22 Annular plate 23, 24 Projection part 25 Extraction hole 26 Lead wire fixing groove

Claims (6)

[Claims] 1. A toroidal coil comprising a toroidal core housed in an insulating case and wound, wherein an insulating case body for housing the toroidal core, a lid for closing an opening of the insulating case body, and an insulating case body are attached. A core case for a toroidal coil with a pedestal, which is composed of a pedestal and is configured to be separable from each other. 2. The insulating case body is a bottomed double cylindrical body having an opening on one side, and a partition plate is provided on the inner cylinder, and the insulating case body is connected to the partition plate on the bottom surface and protrudes from the outer peripheral portion. 2. The core case for a toroidal coil with a pedestal according to claim 1, wherein a wide partition plate is provided, and separation projections for drawing out lead wires are provided on both sides of the wide partition plate. 3. The toroidal coil with a pedestal according to claim 2, wherein an insulating case main body pedestal having a recess and an engaging portion for positioning with respect to the pedestal is provided on an outer peripheral portion of the insulating case main body. For core case. 4. The lid has a wide partition plate, which has a groove on the upper surface thereof and which fits into the partition plate provided in the inner cylinder of the insulating case main body, projects to the inner and outer circumferences, and has lead wires on both sides of the wide partition plate. The core case for a toroidal coil with a pedestal according to any one of claims 1 to 3, wherein a separation protrusion for pulling out is provided. 5. The pedestal has a positioning projection that fits with a positioning recess of the pedestal portion of the insulating case body, a lateral shift prevention portion of the insulating case body, and a locking claw that locks with the engaging portion. The core case for a toroidal coil with a pedestal according to claim 1, wherein 6. The core case for a toroidal coil with a pedestal according to claim 1, wherein the pedestal is provided with a lead wire insertion hole for positioning a lead wire of the toroidal coil and a standoff.