JPS641706Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an insulating bush used for drawing out insulated wires from a chassis or metal case housing circuit elements.

For example, as shown in FIG. 1, conventional noise filters have been constructed by connecting the lead wires of the choke coil 1 and capacitors 2 and 3 that make up the filter circuit, and the exposed core wires of the insulated lead wires 7 (hereinafter simply referred to as lead wires). After assembling the circuit by passing it through the crimp terminal 9 and connecting it by crimping, the lead wire 7 is passed through the insulating bush 10 into the metal case 8 whose insulation has been adjusted with an insulating bush 10 and insulating paper 11. The circuit element was inserted while being pulled, and the case 8 was filled with insulating resin to fix the circuit element and lead wire. In this case, the insulating bush 10 could not fix the lead wire 7, and therefore had the disadvantage that a large amount of resin was filled and a large amount of man-hours and time were required.

The object of the present invention is to provide an insulating bushing that is easy to attach to a metal case and can quickly and reliably fix a lead wire.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a half-sectional side view of an embodiment of the present invention. Referring to the figure, an insulating bushing 4 includes a cylindrical portion 5 made of an insulating material and a crimp fitting portion 6.
The cylindrical portion 5 has a screw 52 formed on its outer periphery.
A collar 51 is provided at one end, and a crimp fitting 6 is embedded and fixed at the other end. Crimp fitting part 6
has an annular insulation coating holding part 61 and an annular core wire crimping part 62 on the same axis, and both are connected by an arc-shaped part. Crimping portion 6 of insulation coating suppressing portion 61
It has an arcuate tongue piece 63 on the opposite side from 2,
The tongue piece 63 is embedded in the tip of the cylindrical part 5 so that the through hole 53 of the cylindrical part 5 and the center hole of the holding part 61 and the crimp part 62 are on the same axis. The cylindrical portion 5 and the crimp fitting portion 6 are integrally molded.

This insulating bushing 4 is provided in a screw hole provided in a plate of a metal case (a screw hole made by burring, a screw hole in a nut welded to fit a through hole in a plate, etc.) or in an insulating plate fitted into an opening in the case. The outer peripheral screw 52 of the cylindrical portion 5 is screwed into the screw hole to be attached to the case. In this case, the collar 51 is oriented to be exposed to the outside of the case. As shown in FIG. 3, the lead wire 7 with the core wire exposed by the required length at the end is inserted into the through hole 53 of the cylindrical portion 5 until the bare core wire corresponds to the core wire crimping portion 62, and then the lead wire 7 is insulated. By crushing the covering suppressing portion 61 and the core wire crimping portion 62, the lead wire 7 can be firmly fixed to the insulating bushing 4.

This insulating bushing 4 itself can be simply and firmly fixed in a screw hole with a screw lock in the same way as a normal screw. Therefore, the lead wire 7 can also be fixed quickly and reliably.

The leads of the circuit elements housed in the case 8 may be connected to the core wire crimping portion 62 together with the exposed core portions of the lead wires by crimping, or may be connected by soldering. Therefore, this insulating bushing not only has the function of simply fixing the lead wire, but also has the function of a terminal.

In the case of the noise filter using the insulating bushing according to the present invention, the lead wire is firmly held by the insulating bushing attached to the case, so it is necessary to cover it with insulating paper spread on the inner bottom of the case and fix the circuit element. It is sufficient to inject a small amount of the embedding resin, and it is sufficient to cover the opening surface of the case with a metal cover plate or an insulating cover plate to which insulating paper is adhered.
The noise filter can be assembled with far fewer materials, man-hours, and time than conventional methods, and the effects of the present invention are significant.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing how a circuit component with insulated lead wires is assembled into a metal case using a conventional insulating bushing; FIG. 2 is a partially sectional side view of an embodiment of the present invention; FIG. 3 is a perspective view of the same along with the lead line. 4... Insulating bushing, 5... Cylindrical part, 51...
...Brim, 52...Screw, 53...Through hole, 6...Crimp fitting, 61...Insulation coating holding part, 62...Core wire crimping part, 63...Tang piece, 7...Insulation coating lead wire, 8 ...Metal case.

Claims (1)

[Scope of utility model registration request] An insulating bushing comprising an insulating cylindrical body having a flange at one end made of an insulating material, and a metal fitting for crimping a covered wire embedded in the other end surface of the insulating cylindrical body.