JP4491130B2 - Toroidal type coil device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a toroidal type coil device, in particular, a type in which a toroidal core is covered with an electrically insulating core cover with a pedestal and coil winding is applied, and is used for, for example, an inductance component of various electronic devices such as a power source and a noise filter. The
[0002]
[Prior art]
As shown in FIGS. 2A, 2B, and 2C, the toroidal type coil device covers the toroidal core 1 in an annular shape with an electrically insulating core cover 2 having an annular cylindrical portion 3 and a pedestal portion 4, The lead wire 5 of the coil winding wound from above the annular cylindrical portion 3 is positioned and fixed through a guide hole 41 formed in the pedestal portion 4 so that a predetermined length is provided under the pedestal portion 4. A mounting terminal is formed. The core cover 2 is divided and formed so as to cover the toroidal core 1 half by both sides. Moreover, it has integrally the separator part 31 which bisects the inner side space part of the toroidal core 1 to a diameter direction.
[0003]
[Problems to be solved by the invention]
In the conventional coil device described above, the lead wire 5 drawn out from the coil winding is passed through the guide hole 41 of the pedestal portion 4 and positioned. The lead wire 5 passed through the guide hole 41 is fixed to the pedestal portion 4 with an adhesive 6 in order to form a mounting terminal having a predetermined length under the pedestal portion 4.
[0004]
However, the use of the adhesive 6 requires a process for injecting and solidifying the adhesive in addition to the cost of the adhesive, and further a temporary fixing means until solidification, thereby reducing productivity and cost. It has been found that this causes the problem of increasing
[0005]
The present invention has been made in view of the above problems, and its purpose is to bond the lead wire of the coil winding to the lead wire while securing the positioning accuracy required as a mounting terminal. It is an object of the present invention to provide a toroidal type coil device that can improve productivity and reduce costs by eliminating an agent.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the first means of the present invention covers the toroidal core in an annular shape with an electrically insulating core cover having an annular cylindrical portion and a pedestal portion, and is wound from above the annular cylindrical portion. by positioning and fixing the lead wire of the coil winding through the guide hole formed in the base portion, the toroidal coil device forming the mounting terminals of the predetermined length under the base portion,
The core cover, the protrusion inducing bent into a crank shape said lead wire in front of the guide hole is formed,
The pedestal is formed with a forming guide for preliminary bending of the lead wire,
In the forming guide, a groove into which the lead wire is introduced from the side is formed, and a tapered bent surface is formed on one side wall surface of the groove. .
[0007]
According to the above means, the lead wire passed through the guide hole is positioned in the lateral direction by the guide hole, and is moved in the vertical direction by being guided to be bent in a crank shape before the guide hole. It comes to be locked and fixed. As a result, it is possible to improve the productivity and reduce the cost by securing the positioning accuracy required as a mounting terminal for the lead wire of the coil winding while eliminating the need for an adhesive to fix the lead wire. Achieved.
Then, a forming guide for preliminarily bending the lead wire is formed on the pedestal portion, and the forming guide forms a groove into which the lead wire is introduced from the side, and one side of the groove Since the wall surface has a tapered bent surface, the lead wire can be easily and accurately formed into a predetermined bent shape in front of the guide hole without using a special jig. As a result, the lead wire can be formed more easily and accurately.
[0008]
The second means is characterized in that, in the first means, a notch portion is formed on the other side wall surface of the groove so as to expand in a tapered shape toward the side . This ensures that it is possible to perform the operation of moving the operation and forming the lead wires to move the lead wire forming the guide in the forming guide outer smoothly.
[0009]
A third means is characterized in that, in the first or second means, a guide groove portion is formed for introducing the lead wire into the guide hole from a side of the pedestal portion . Thus, Rukoto to perform the lead wire and the work of folding molding (forming) in a crank shape in front of the guide hole, and a work through the guide hole of the lead wire is molded that occasion songs, in both simple and smooth Will be able to.
[0010]
A fourth means is characterized in that, in any one of the first to third means, a protruding portion for pressing and biasing the lead wire toward the protruding portion is formed on the core cover . As a result, the lead wire can be more reliably fixed, and the lead wire can be prevented from deviating to the side of the pedestal .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1A and 1B show an embodiment of a toroidal coil device according to the present invention. The basic structure of the coil device shown in the figure is similar to that shown in FIG. 2, and the toroidal core 1 is covered in an annular shape by an electrically insulating core cover 2 having an annular cylindrical portion 3 and a pedestal portion 4. The lead wire 5 of the coil winding wound from above the portion 3 is positioned and fixed through a guide hole 41 formed in the pedestal portion 4, so that a mounting terminal having a predetermined length is provided under the pedestal portion 4. Is forming. The core cover 2 is divided and formed so as to cover the toroidal core 1 half by both sides (see FIG. 2). Moreover, it has integrally the separator part 31 which bisects the inner side space part of the toroidal core 1 to a diameter direction. A transformer having a primary coil and a secondary coil is formed by providing coil windings on both sides of the separator portion 31. The core cover 2 can be formed in a single process by resin molding.
[0014]
In addition to the above-described configuration, in the coil device of the embodiment, the core cover 2 is formed with a protrusion 43 that guides the lead wire 5 to be bent in a crank shape before the guide hole 41. The protrusion 43 is formed at a position covering the guide hole 41 directly above. Therefore, in a straight state, the lead wire 5 is blocked by the projection 43 and cannot be passed through the guide hole 41, but can be passed through the guide hole 41 only after being bent in a crank shape in advance. . Therefore, the lead wire 5 is bent in a crank shape between the projection 43 and the guide hole 41.
[0015]
The lead wire 5 passed through the guide hole 41 is positioned in the lateral direction by the guide hole 41 and is guided to be bent in a crank shape in front of the guide hole 41 so that the movement in the vertical direction is locked. It is fixed. As a result, an adhesive for fixing is not required for the lead wire 5 of the coil winding while securing the positioning accuracy required as a mounting terminal, thereby improving productivity and reducing costs.
[0016]
A guide groove portion 42 that extends to the side of the pedestal portion 4 communicates with the guide hole 41. With the guide groove portion 42, the lead wire 5 can be pushed through the guide hole 41 from the side of the pedestal portion 4. Thereby, both the operation of bending the lead wire 5 into a crank shape before the guide hole 41 and the operation of passing the bent lead wire 5 through the guide hole 41 are easily and smoothly performed. Can do.
[0017]
The separator portion 31 is formed with a protruding portion 44 that presses and biases the lead wire 5 toward the protruding portion 43 side. As a result, a frictional locking force acts between the lead wire 5 and the protrusion 43, and the lead wire 5 is more reliably positioned and fixed, and the lead wire 5 deviates to the side of the base portion 4. Can be prevented.
[0018]
A forming guide 45 for bending the lead wire 5 is formed on the pedestal portion 4. The forming guide 45 forms a groove into which the lead wire 5 is introduced from the side. A tapered bent surface 46 is formed on one side wall surface of the groove. Further, a notch 47 is formed on the other side wall surface of the groove so as to expand in a tapered shape toward the side.
[0019]
This forming guide 45 is used as follows. First, after the lead wire 5 is introduced into the forming guide 45 from the side of the pedestal portion 4, the lead wire 5 is preformed (preliminary bending) as indicated by a broken line in the drawing. After this preform, the lead wire 5 is moved from the forming guide 45 to the guide hole 41 for positioning and fixing. Accordingly, the lead wire 5 can be easily and accurately formed into a predetermined bent shape before the guide hole 41 without using a special jig.
[0020]
At this time, the taper-shaped bent surface 46 forms a good jig function that makes the forming of the lead wire 5 easier and more accurate. In addition, the notch 47 that expands in a tapered shape can smooth the operation of moving the lead wire 5 to the forming guide 45 and the operation of moving the formed lead wire 5 out of the forming guide 45.
[0021]
【The invention's effect】
As described above, in the toroidal type coil device according to the present invention, the lead wire is bent in a crank shape in front of the guide hole formed in the pedestal portion, so that the mounting terminal is connected to the lead wire of the coil winding. As a result, it is possible to improve productivity and reduce costs by securing the necessary positioning accuracy and eliminating the need for an adhesive to fix the lead wires.
[Brief description of the drawings]
1A and 1B are diagrams showing an embodiment of a toroidal coil device according to the present invention, in which FIG. 1A is a front view and FIG. 1B is a bottom view.
2A and 2B are diagrams showing a configuration of a conventional toroidal coil device, in which FIG. 2A is an exploded perspective view, FIG. 2B is a front view, and FIG. 2C is a bottom view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Toroidal core 2 Core cover 3 Annular cylinder part 31 Separator part 4 Base part 41 Guide hole 42 for positioning fixation Guide groove part 43 Projection part 44 Projection shape part 45 Forming guide 46 Tapered bending surface 47 Tapered notch part 5 Lead wire 6 Adhesive (conventional)

Claims (4)

The toroidal core core cover of electrically insulating having an annular cylinder portion and the base portion to cover the annular, the lead wire of the coil windings wound over the annular cylinder portion in the guide hole formed in the base portion by positioning the fixed through, in the toroidal type coil device forming the mounting terminals of the predetermined length under the base portion,
The core cover, the protrusion inducing bent into a crank shape said lead wire in front of the guide hole is formed,
The pedestal is formed with a forming guide for preliminary bending of the lead wire,
In the forming guide, a groove into which the lead wire is introduced from the side is formed, and a tapered bent surface is formed on one side wall surface of the groove. Toroidal coil device. 2. The toroidal coil device according to claim 1, wherein a notch portion is formed on the other side wall surface of the groove so as to expand in a tapered shape toward the side . 3. The toroidal coil device according to claim 1, wherein a guide groove portion for introducing the lead wire into the guide hole from a side of the pedestal portion is formed. 4. 4. The toroidal coil device according to claim 1, wherein the core cover is formed with a protruding portion that presses and biases the lead wire toward the protruding portion . 5.

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