JPS6129135Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an insulating bushing that electrically insulates between a metal plate and a terminal when a connecting terminal is passed through a metal case that constitutes a housing. a flange on the end surface of the cylindrical male insulator located inside the metal case, and a surface in contact with each plate of the ring-shaped female insulator that fits on the cylindrical outer periphery of the male insulator; Relating to an insulating bushing having a plurality of recesses extending along the outer periphery, or connecting the recesses to form a ring-shaped groove between the inner periphery and the outer periphery, or providing a membrane-like side wall around the outer periphery of the recess. .

For circuit component devices, such as noise prevention filters, in which a circuit is constructed by incorporating coils and capacitors into a metal case, in order to pull out the connection terminals from the metal case to the outside, holes are drilled at appropriate positions in the metal case to provide electrical insulation. An insulating bush made of aluminum is attached to a metal case, a connecting terminal is passed through the center of the bushing, the case is filled with electrically insulating resin, and the case is covered with a lid.

Conventionally, the connection terminal using this insulating bush was the first
As shown in the figure, a flange 1 is provided on an end face located inside the metal case of a male insulator 1 having a cylindrical portion 12 in a hole penetrating a plate 7 such as a metal case.
An adhesive 10 is applied to the surface of the metal case 1 in contact with the plate 7, and the cylindrical part 12 is passed through the hole in the plate 7 from inside the metal case. On the other hand, the female insulator 2 of the ring that fits on the outside of the cylindrical part 12 of the male insulator 1 is also applied to the surface where it contacts the plate 7, and is fitted into the cylindrical part 12. A plate 7 is sandwiched and fixed between the insulators 1 and 2. Furthermore, pass the screw 5 through the center hole of the male insulator 1 through the lug terminal 3 connected to the lead wire 4 that combines a coil, capacitor, etc., pass the washer 6 outside the metal case, and fit the nut 8. Determine the direction of the lug terminal 3 and tighten it, and apply adhesive to the boundary of the female insulator 2 to secure it. Further, two washers 6' and a spring washer 9 were passed through the screw 5, and a nut 8' was screwed in to form an external connection terminal.

However, in this installation method, the male and female insulators 1 and 2 are glued on the surfaces that contact the plate 7, so there is no risk of damaging the insulators even if the nut 8 is tightened strongly. Furthermore, it takes time for the adhesive to dry and completely adhere, making it impossible to proceed with the next terminal installation process.
Another disadvantage is that if too much adhesive is applied, the adhesive may protrude from the outer periphery of the insulator.

The present invention relates to an insulating bush in which adhesive can be injected after both insulators are attached to a plate and a connecting terminal is assembled, which shortens the time required to apply the adhesive and prevents appearance defects on the connecting terminal. Quality can be improved.

FIG. 2 shows an embodiment of the present invention showing a part of the insulating bushing and plate body of the present invention, and the collar 11 of the male insulator 1 of the insulating bushing has a surface in contact with the plate body 7 and the outer periphery. Therefore, recesses 13 are provided at equal intervals on the outer periphery, and a plurality of recesses 21 are similarly provided on the surface of the female insulator 2 in contact with the plate 7. This type of male insulator 1 and female insulator 2 are sandwiched between a plate 7 as shown in Fig. 3, and a lug terminal 3 with a lead wire connected to the insulator's center hole and a screw 5 are passed through the lug terminal 3 and a screw 5 is secured to the washer externally. 6 and nuts 8 to attach the connection terminal to the metal case. Thereafter, a filling adhesive such as an epoxy resin is injected into the recesses 13 and 21 and the adhesive is solidified.

FIG. 4 shows another embodiment of the insulating bushing according to the present invention, with a male insulator 1 and a female insulator 2.
The recesses 13 and 21 are formed in the same manner as shown in FIG.
In addition, a ring-shaped groove 14 is provided between the outer periphery and the inner periphery of the insulator to connect the recess 13 or 21, and the adhesive injected into the recess 13 connects the groove 14. This has the advantage of enlarging the bonding area by extending the entire circumference.

Further, FIG. 5 shows still another embodiment of the present invention,
Insulator recess 13 with groove 14 in FIG.
A recess 15 is formed on the outer circumferential side of the recess 15 with a thin membrane-like side wall 16 that can be easily pierced with a needle tip. In the present invention, it is sufficient to make a small hole in any one of the recesses 15 and inject the adhesive, and a fluid adhesive with low viscosity can also be used. Even if air leaks out, the adhesive will not leak. If the injection direction is approximately determined, the efficiency of the injection work will be improved, and an insulating bushing can be obtained without applying excess adhesive to the case surface and without damaging the appearance.

As explained above, the insulating bushing of the present invention can be assembled by assembling the insulating bushing in a metal case, assembling and wiring the connecting terminals to the circuit component device, injecting adhesive, and leaving it as it is to allow the adhesive to harden. In addition, it is possible to reduce assembly work and obtain an insulating bushing with a good appearance without having to wait for the adhesive to harden before assembling during work.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of a conventional insulating bushing, Fig. 2 is an exploded perspective view of an embodiment of the insulating bushing according to the present invention, and Fig. 3 is an assembled perspective view of an embodiment of the insulating bushing of the present invention. 4 is an exploded perspective view of another embodiment of the insulating bush of the present invention, and FIG. 5 is a front view a and a partial cross-section of a male insulator of still another embodiment of the insulating bush of the present invention. Fig. 3 is a side view b. In the figure, 1... Male insulator, 2... Female insulator, 7... Plate, 11... Flange, 12... Cylindrical part, 13, 15, 21... Recess, 14... Groove. ,
16...Side wall.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A pair of cylindrical fitting parts constituting a connecting terminal electrically insulated from a plate constituting a metal casing are a male type having a flange and a ring-shaped part. An insulating bushing comprising a female type, and having recesses on the outer periphery of each of an end face of the flange on the joint side of the male type and one end face abutting the plate of the female type. (2) The insulating bushing according to claim 1, wherein the recess has a membrane-like side wall. (3) The insulating bushing according to claim 1 or 2, wherein a ring-shaped groove communicating with the recess is provided on the end surface that abuts the plate.