JP3846549B2 - choke coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a choke coil formed by winding a coated wire around a core and molding a resin around the core.
[0002]
[Prior art]
An example in the case of using the choke coil by a prior art connected to a ground wire is demonstrated with reference to FIGS. A covered wire 2 is wound around the core 1, a resin is molded around the core 1 and the covered wire 2, and a groove portion 10 is partially disposed on the outer periphery of the resin member 3. Further, a recess 4 serving as a push pin portion is disposed on the outer periphery of the resin member 3. When the concave portion 4 is provided at the position and depth as shown in FIG. 6, when the covered wire 2 is pushed to the position of the concave portion 4 in the radial direction of the core 1 by the injection pressure of the resin during molding, There is a possibility that the covered wire 2 may be damaged when the wire 2 is caught in the push pin or when the choke coil is pushed with the push pin after molding.
[0003]
In addition, outlet portions 8 of the covered wire 2 are provided on both end surfaces 7 of the resin member 3. As shown in FIG. 5, when the covered wire 2 of the outlet portion 8 is not located at the center of the resin member 3, as shown in FIG. 7, when the covered wire 2 of the outlet portion 8 is pulled from both directions, the covered wire 2 May be bent in the vicinity of the outlet portion 8, and the covered wire 2 may be damaged by the resin portion 9 of the outlet portion 8.
[0004]
Further, as shown in FIG. 8, when the groove portion 10 is partially disposed, the covered wire 2 is moved to the resin member 3 by the core 1 and the covered wire 2 on the outer periphery thereof being offset toward the outer peripheral side of the resin member 3. May be exposed to the outer peripheral surface of the wire and damage the covered wire 2. In order to prevent this, if the covered wire 2 is to be completely stored inside the resin member 3, it is necessary to increase the thickness between the outer periphery of the resin member 3 and the covered wire 2. It is not possible to reduce the weight.
[0005]
[Problems to be solved by the invention]
In the conventional choke coil, when the coated wire around the core is pushed in the radial direction of the core to the position of the push pin portion due to the injection pressure of the resin at the time of molding, the covered wire is bitten by the push pin, When the choke coil is pushed with a push pin after molding, the covered wire may be damaged.
[0006]
In addition, if the covered wire coming out from both end faces of the resin member is not located at the center of the resin member, when the covered wire is pulled from both directions, the covered wire is bent in the vicinity of the outlet portion, and the resin member at the outlet portion The covered wire may be damaged.
[0007]
Furthermore, when the groove portion of the resin member is partially disposed, the coated wire on the outer periphery of the resin member is exposed to the outer peripheral surface of the resin member by the core and the coated wire on the outer periphery thereof being offset toward the outer peripheral side of the resin member. Risk of damage. In order to prevent this, if the coated wire on the outer periphery of the core is completely accommodated in the resin member, it is necessary to increase the thickness between the outer periphery of the resin member and the coated wire, thereby reducing the size and weight. There were problems such as being unable to do so.
[0008]
An object of the present invention is to solve the above problems, prevent damage to the covered wire, and reduce the size and weight of the choke coil.
[0009]
[Means for Solving the Problems]
In the choke coil of the present invention, the choke coil of the present invention is provided with a recess serving as a push pin between adjacent coated wires on the outer periphery of the core, and resin is molded between the bottom of the recess and the outer periphery of the core. There is a space, and the covered wire coming out from both end faces of the resin member is arranged in the center of the resin member, and the groove portion extends over the entire circumference of the resin member so that the core is located in the center of the resin member. This is achieved by arranging.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the accompanying drawings and FIGS. In this embodiment, the case where the choke coil is connected to the ground wire is described. As shown in FIG. 2, a covered wire 2 is wound around the core 1, and a resin is molded around the core 1 and the covered wire 2 to form a resin member 3. And the recessed part 4 used as a push pin part is arrange | positioned in the resin member 3 between the adjacent coated wires 2 of the core 1 outer periphery, and the space 6 by which resin is shape | molded between the bottom part 5 of the recessed part 4, and the core 1 outer periphery. have. Therefore, even when the coated wire 2 is pushed in the radial direction of the core 1 to the position of the recess 4 serving as the push pin portion due to the injection pressure of the resin during molding, the covered wire 2 is bitten by the push pin or molded. Later, when the choke coil is pushed with the push pin, the covered wire 2 is not damaged.
[0011]
As shown in FIG. 1, the outlet portion 8 of the covered wire 2 is disposed at the center of the resin member 3 on both end faces 7 of the resin member 3. Therefore, as shown in FIG. 3, even when the covered wire 2 of the outlet portion 8 is pulled from both directions, the covered wire 2 is not bent in the vicinity of the outlet portion 8. The resin part 9 of the outlet part 8 is prevented from being damaged.
[0012]
Further, as shown in FIG. 4, a groove portion 10 is disposed over the entire circumference or almost the entire circumference of the resin member 3 so that the core 1 is positioned at the center of the resin member 3. Accordingly, the coated wire 2 on the outer periphery of the core 1 is not damaged because the coated wire 2 on the outer periphery of the resin member 3 is not shifted to the outer peripheral side of the resin member 3 and the coated wire 2 is not exposed on the outer peripheral surface of the resin member 3. To prevent. Further, the thickness between the outer periphery of the resin member 3 and the covered wire 2 can be minimized, and the size and weight can be reduced.
[0013]
【The invention's effect】
As described above, according to the present invention, a recess serving as a push pin portion is disposed between adjacent coated wires on the outer periphery of the core, and resin is molded between the bottom of the recess and the outer periphery of the core. There is a space, and the covered wire coming out from both end faces of the resin member is arranged in the center of the resin member, and the groove portion extends over the entire circumference of the resin member so that the core is located in the center of the resin member. By disposing, the covered wire can be prevented from being damaged, and the choke coil can be reduced in size and weight. Moreover, since the mold structure can be simplified by disposing the covered wires coming out from both end faces of the resin member at the center of the resin member, the cost of the mold is reduced.
[Brief description of the drawings]
FIG. 1 is an external view showing an embodiment of a choke coil according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
3 is a longitudinal sectional view of FIG. 1. FIG.
4 is a cross-sectional view taken along the line BB in FIG.
FIG. 5 is an external view showing an example of a conventional technique.
6 is a cross-sectional view taken along the line CC of FIG.
7 is a longitudinal sectional view of FIG.
8 is a cross-sectional view taken along the line DD of FIG.
[Explanation of symbols]
1 is a core, 2 is a covered wire, 3 is a resin member, 4 is a recess, 5 is a bottom, 6 is a space, 7 is an end surface, 8 is an outlet, 9 is a resin, and 10 is a groove.

Claims (2)

A coated wire coated with a copper wire is wound around a core, and a resin member formed by molding a resin around the coated wire and the core has outlet portions of the coated wire on both end surfaces of the resin member, In a choke coil having a recess to be a push pin portion on the outer periphery of the resin member, and having a groove portion on the outer periphery of the resin member, the recess is disposed between the covered wires adjacent to the outer periphery of the core, and There is a space in which resin is molded between the bottom of the recess and the outer periphery of the core, and the covered wire of the outlet is disposed at the center of the resin member, and the core is positioned at the center of the resin member Thus, the choke coil is characterized in that the groove portion is disposed over the entire circumference or substantially the entire circumference of the resin member. The choke coil according to claim 1, wherein the groove portion is disposed on both end faces of the resin member.

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