JP3386493B2 - Lead terminal insertion hole sealing structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing lead terminal insertion holes.
Regarding the structure . 2. Description of the Related Art Japanese Utility Model Laid-Open Publication No. 63-50432 discloses that a hermetic plug (rubber plug) having a through hole is press-fitted into a lead terminal fitting hole which is penetrated into a magnet switch housing and into which an eyelet is fitted. Then, insert the lead terminal into the through hole,
Then, it has been proposed to prevent the solder from falling by pouring the solder into the lead terminal fitting holes. [0003] However, in the above-mentioned prior art, although the solder is prevented from dropping into the inside of the housing and is effective for keeping the inside airtight, the lead terminal is inserted into the narrow through hole of the rubber plug. It is not easy to insert and insert, and there has been a problem that the leading end of the lead terminal is caught by the rubber plug and the leading end of the lead terminal is bent. When a plurality of lead terminals are inserted into the through-hole, the composite cross-section of the plurality of lead terminals is non-circular, so that a gap is formed in the through-hole and solder may leak from the gap. was there. Of course, if the elastic hermetic plug is sufficiently compressed and press-fitted into the lead terminal fitting hole, the above gap can be eliminated by elasticity, but instead, the fitting of the lead terminal becomes difficult. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a lead terminal insertion hole sealing structure which can easily insert and insert a lead terminal and can prevent leakage and intrusion of solder satisfactorily. And SUMMARY OF THE INVENTION A lead terminal insertion and insertion method according to the present invention.
The hole sealing structure is designed to fit the lead terminal
It has an edge and pushes inside the lead terminal insertion hole.
A plug which is inserted to seal the lead terminal fitting hole,
A plurality of lead terminals which penetrate and penetrate the sealing plug;
Filled into the lead terminal insertion hole after the terminal has penetrated
Solder, and the plug is provided between the plurality of lead terminals.
Hold the plurality of lead terminals while maintaining a predetermined interval
It is characterized in that that. The inside of the lead terminal fitting hole of the substrate is sealed by a flexible and electrically insulating plug which can be broken through by the lead terminal. When the lead terminal is fitted into this lead terminal fitting hole, The lead terminal breaks through the plug. If the solder is poured into the lead terminal fitting hole in this state, the solder is blocked by the plug portion and does not leak or intrude from the lead terminal fitting hole to the opposite side. Therefore, according to the present invention, defects such as poor soldering due to leakage or intrusion of solder from the lead terminal insertion hole, or adhesion or short circuit of solder to circuit elements or wiring near the lead terminal insertion hole. Is eliminated. (Embodiment 1) An embodiment of the present invention will be described with reference to FIG. The cover 1 is a resin cover of the magnet switch of the starter. The cover 1 is provided with a lead terminal fitting hole 2.
1 is formed at right angles to the main surface. Lead terminal insertion hole 2
Is a circular hole, in which the outer end has a small diameter portion, the inner end has a large diameter portion, and the central portion has a conical portion. A hole 41 of the terminal 4 is overlapped with the outer end opening of the lead terminal fitting hole 2, and the hollow rivet 3 is fitted into the small diameter portion of the lead terminal fitting hole 2 in this state. The outer flange of the hollow rivet 3 presses the terminal 4 against the outer surface of the cover 1, and the inner caulked portion of the hollow rivet 3 is enlarged in diameter and caulked to the conical portion of the lead terminal fitting hole 2. By the swaging, the gap between the hollow rivet 3 and the inner peripheral surface of the lead terminal fitting hole 2 is sufficiently kept airtight. A plug 5 made of sponge-like resin is pushed into the conical portion of the lead terminal fitting hole 2 from the large diameter side of the lead terminal fitting hole 2 to seal the conical portion. A ground plate 6 serving as a yoke and ground electrode of a magnet switch is disposed on the inner main surface side of the cover 1.
The other surface of the ground plate 6 is in contact with the outer end surface of the end flange 71 of the coil bobbin 7 of the magnet switch. The ground plate 6 has a hole 61 coaxial with the lead terminal fitting hole 2.
Is pierced. From the outer end surface of the end flange portion 71 of the coil bobbin 7, a draw-out tubular portion 72 is provided so as to protrude through the hole 61,
The distal end of the drawer tube portion 72 reaches the large diameter portion of the lead terminal insertion hole 2. A pull-in coil (not shown) of a magnet switch is provided on a central shaft (not shown) of the coil bobbin 7.
And holding coil 8 are wound, and their coil terminals (lead terminals in the present invention) 81, 82 are
After the enamel coating is peeled off, the two coil terminal pull-out holes penetrated through the draw-out tube portion 72 are individually penetrated, and further, the sponge-shaped plug portion 5 is pierced so as to penetrate the lead terminal fitting hole 2 and the terminal 4. Hole 41. After the above state, the solder 9 is dripped from the outside into the hollow rivet 3, and the terminal 4, the hollow rivet 3, and the coil terminal 8
1, 82 are soldered, the coil terminals and the terminals 4 are connected and conducted, and the holes of the hollow rivets 3 are sealed. Therefore, the above soldering process involves attaching the terminal 2 and the hollow rivet 3 to the lead terminal fitting hole 2, pushing the plug 5, and fitting the coil terminals 81 and 82 to the lead terminal fitting hole 2. Insertion and breakage of the plug portion 5 and soldering are performed in this order. What is important in this embodiment is that the solder 9 tends to hang down inside the lead terminal fitting hole 2 during soldering, and when the hanging solder 9 comes into contact with the ground plate 6, the ground plate 6 is grounded. , The terminal 4, the hollow rivet 3, the coil terminal 81,
82 is short-circuited. In this embodiment, the plug 5
Is used to prevent this. Since the plug portion 5 is a soft sponge and easily pierced by the coil terminals 81 and 82, the coil terminals 81 and 82 do not bend and no gap is formed around the coil terminals 81 and 82 after the piercing. No. The stopper may not be spongy as long as it is soft. The material of the plug part 5 is polyester
, Polyethylene foam, polyurethane foam, foamed rubber, foamed styrene, and the like. These foamed materials have closed pores. This is preferable, but there is no problem even with continuous pores if the compression ratio is high. Polyester foam
Although the melting point of the film, polyethylene foam or the like is lower than the soldering temperature, the soldering time is usually as short as several seconds, so that the solder does not melt as a whole, and the penetration of the solder 9 is prevented. It is to be noted that the assembly of the plug portion 5 can be easily automated by using insertion by pressure feeding using air or the like. (Embodiment 2) Another embodiment is shown in FIG. In this embodiment, the tip of the drawn-out tube portion 72 of the coil bobbin 7 is
Is set so that the plug portion 5 or the drawer tube portion 72 is dimensioned so as to be pushed upward in the drawing. By doing so, the coil terminals 81, 82
After piercing through the plug 5, the drawer cylinder 72 compresses the plug 5, so that the plug 5 is pressed against the inner peripheral surface of the lead terminal fitting hole 2, and the coil terminals 81, 82 and the plug The degree of adhesion with the plug 5 is also improved, and the plug 5 itself is also compressed. As a result, the degree of sealing of the lead terminal fitting hole 2 by the plug 5 is greatly improved. Accordingly, in this embodiment, a gap may be formed between the hollow rivet 3 and the cover 1, so that the caulking accuracy of the hollow rivet 3 can be greatly reduced. (Embodiment 3) Another embodiment will be described with reference to FIGS. In this embodiment, the final shape is the same as FIGS. 1 and 2, but the assembling process is different. That is, in this embodiment, the coil terminal 8
The plug terminal 5 is preliminarily penetrated outside at 1 and 82, and then the coil terminals 81 and 82 are inserted into the lead terminal insertion hole 2 and the plug terminal 5 seals the inside of the lead terminal insertion hole 2; Finally, it is to be soldered. The effect is the same. In each of the embodiments described above, the soldering portion between the coil terminals 81 and 82 of the magnet switch and the terminal 4 has been described. However, it is obvious that the present invention can be applied to the soldering of other lead terminals (including coil terminals and the like). is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view illustrating one embodiment of the present invention; FIG. 2 is a cross-sectional view illustrating another embodiment of the present invention; ... Lead terminal fitting holes, 3 ... hollow rivets, 4 ... terminals, 5 ... plugs, 6 ... ground plates for magnet switches, 7 ... coil bobbins, 81, 82
... Coil terminal (lead terminal in the present invention).

Claims (1)

(57) [Claim 1] A lead terminal fitting hole, which has flexibility and electrical insulation and has a lead terminal.
The lead terminal is inserted into the insertion hole to tightly close the lead terminal insertion hole.
A plug to be closed, a plurality of lead terminals that penetrate and penetrate the plug, and the lead terminal fitting hole after the penetration of the lead terminal.
A solder to be filled, wherein the sealing plug is sure a predetermined distance between the plurality of lead terminals
Holding the plurality of lead terminals while maintaining
Lead terminal insertion hole sealing structure .