JPH041703Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a core insulating case that houses an endless core such as annular or rectangular. By making the fitting contact surface a tapered surface, the adhesion between both core covers, hermeticity, electrical insulation, fit and assembly workability, mold releasability, etc. are improved.

Prior Art As a core insulating case for configuring a noise filter such as a common mode choke coil or a toroidal type large current coil, for example,
The one disclosed in No. 183712 is publicly known. FIG. 3 is an exploded perspective view of a conventional core insulating case shown in this prior art, and FIG. 4 is an assembled cross-sectional view thereof. On the other hand, core covers 2 and 3 made of insulating resin or the like are placed over and below the core cover to form a core insulating case. The core covers 2 and 3 have endless opening grooves 21 and 31 opened on one side, and inner peripheral edges 22 and 32 and outer peripheral edges 23 and 33 forming the opening grooves 21 and 31 are closely fitted to each other. It is assembled. Inner peripheral edges 22, 32 and outer peripheral edges 23, 33
The fitting contact surfaces A and B are stepped and in close contact with each other. As shown in FIG. 5, windings 4 are wound around the outer peripheries of the core insulating cases 2 and 3 to constitute a noise filter or the like. In addition, 24,
34 is a mounting seat.

Problems to be solved by the invention As mentioned above, the conventional core insulation case uses a pair of core covers 2 and 3 with endless opening grooves 21 and 31 on one side, and these core covers Since the inner circumferential edges 22, 32 or the outer circumferential edges 23, 33 forming the opening grooves 21, 31 of 2 and 3 were assembled so that the fitting contact surfaces A and B were in close contact with each other over the entire circumference, the following There were problems like this.

(B) The more the insulation is improved by increasing the fit of the core covers 2 and 3, the smaller the fit clearance between the inner edges 22 and 32 and the outer edges 23 and 33 of the coil covers 2 and 3 becomes. , it becomes difficult to assemble and fit the core covers 2 and 3 together.

(b) On the contrary, the inner peripheral edges 22 of the coil covers 2 and 3,
If the fitting clearance between the coil covers 2 and 32 and the outer peripheral edges 23, 33 is increased, the fitting and assembly work will be made easier, but this will cause play between the coil covers 2 and 3, reducing the reliability of the assembly, and at the same time reducing the electrical insulation properties. becomes worse.

The present invention solves the above-mentioned conventional problems and provides a core insulating case that improves the adhesion of both core covers, hermeticity, electrical insulation, fitting and assembly workability, mold releasability, etc. purpose.

Means for Solving the Problems In order to solve the above problems, the present invention provides a pair of core covers having endless opening grooves formed by an inner peripheral edge and an outer peripheral edge, with the opening grooves facing each other. In the core insulating cover assembled by fitting the inner circumferential edge or the outer circumferential edge to each other in this manner, the fitting contact surface of the inner circumferential edge or the outer circumferential edge is a tapered surface.

Function When the fitting contact surface on the inner peripheral edge or the outer peripheral edge is made into a tapered surface, it is possible to make a tapered fit when assembling the two core covers. For this reason,
Fitting and assembly work becomes easier. Furthermore, by selecting the taper angle of the tapered surfaces, it is possible to make them come into close contact with each other, so that the close contact and sealing performance of both core covers can be improved, and the electrical insulation can also be improved. Furthermore, the tapered surface forms a draft angle during mold molding, improving mold releasability.

Embodiment FIG. 1 is a sectional view of a core insulation case according to the present invention. In this embodiment, a pair of core covers 2 each having endless opening grooves 21 and 31 opened on one side,
3, the inner peripheral edges 22, 32 or the outer peripheral edges 23, 33 forming the opening grooves 21, 31 of these core covers 2, 3 are fitted together to form a core insulating case, and the opening grooves 21 , 31 is the same as the conventional one, but unlike the conventional one, the inner peripheral edges 22, 32 and the outer peripheral edges 23, 33 that form the opening grooves 21, 31 are , a curved tapered surface a that slopes toward the opening end
It has a structure of ~d. With such a structure, when assembling the core covers 2 and 3 together, the tapered surfaces a to d formed on the inner circumferential edges 22 and 32 and the outer circumferential edges 23 and 33 are used. Since they can be fitted smoothly, the fitting and assembly work becomes easy. Furthermore, by selecting the taper angles of the tapered surfaces a to d, it is possible to make them come into close contact with each other, thereby increasing the adhesion and sealing performance of both core covers 2 and 3, and improving the electrical insulation. can. Furthermore, since the circumferential surface becomes tapered surfaces a to d,
A mold draft angle is formed during mold molding, improving mold releasability. These effects become even more remarkable by making the tapered surfaces a to d curved as shown in the figure.

In the above embodiment, the core covers 2 and 3 have a structure that is independent of each other, but as shown in FIG. good. In addition, the inner peripheral edges 22, 32 and the outer peripheral edges 23, 33
may be formed singly on the entire circumferential surface, but if, for example, semicircular or smaller circumferential surfaces are alternately formed, a common mold can be used.

Effects of the Invention As described above, the present invention provides a pair of core covers each having an endless opening groove formed by an inner peripheral edge and an outer peripheral edge so that the opening grooves face each other. In the core insulating cover assembled by fitting the peripheral edges or the outer peripheral edges to each other, the fitting contact surface of the inner peripheral edge or the outer peripheral edge is a tapered surface.
Since it is possible to improve hermetic electrical insulation, fitting and assembly workability, mold releasability, etc., the manufacturing process is easy and the industrial benefits are great.

[Brief explanation of the drawing]

Fig. 1 is an assembled sectional view of a core insulating case according to the present invention, Fig. 2 is an assembled sectional view of another embodiment, Fig. 3 is an exploded perspective view of a conventional core insulating case, and Fig. 4 is the same. The sectional view and FIG. 5 are perspective views of the coil wound. 1... Core, 2, 3... Core cover, 21, 3
1... Opening groove, 22, 32... Inner peripheral edge, 23, 3
3... Outer periphery, a to d... Tapered surface.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of core covers each having an endless opening groove formed by an inner peripheral edge and an outer peripheral edge, with the opening grooves facing each other, What is claimed is: 1. A core insulating case, characterized in that a core insulating cover assembled by fitting outer circumferential edges together has a fitting contact surface of the inner circumferential edge or the outer circumferential edge having a tapered surface. (2) The core insulating case according to claim 1, wherein the tapered surface is curved. (3) The core insulation case according to claim 1 or 2, wherein the pair of core covers are connected by a hinge portion integrally formed with the core covers. .