JPH087735A - Base structure of relay - Google Patents

Abstract

PURPOSE:To provide a relay sealing structure which is equipped with a sufficient airtightness sustaining high temp. for a long period and is free from leakage when relay is mounted on a board. CONSTITUTION:A base 11 is provided with terminal insert holes 22A, 22B, 26A, 26B, and outer a tapering face 24 and inner tapering face 29 are formed on the inside open edge and outside open edge of each of the terminal insert holes. The insert holes are formed inside the protrusive tubular parts 28, 29 which protrude inside the base 11. A frame 11a is formed at the peripheral edge of the base 11, and a peripheral edge tapering face 11b is formed on the outside of this frame 11a. The insert holes 22A, 22B are provided with a major diameter inserting part formed inside the protrusive tubular part 27 on the inside of the base 11. The configuration facilitates and ensures influx and intrusion of a sealing material to the part specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay base structure, and more particularly to a structure suitable for mounting a base on a case body to make the relay a hermetically sealed structure.

[0002]

2. Description of the Related Art Conventionally, as a structure of a small-sized electromagnetic relay, an electromagnetic coil attached to a coil spool, a yoke attached to the electromagnetic coil, and a yoke connected to the electromagnetic coil are operated to operate with respect to magnetic poles of the electromagnetic coil. A movable iron piece configured as described above, and a movable contact attached to the movable iron piece,
A fixed contact arranged so as to face the movable contact is provided inside the case body, and a common terminal connected to the movable contact and an a terminal or ab terminal connected to the fixed contact and an electromagnetic coil are connected. The coil terminal thus formed is inserted into the base and led out to the outside.

Here, in order to obtain the airtightness of the relay, a molten resin for sealing is poured from the outer surface of the base attached to the case body while inserting each terminal, and the terminal insertion hole and each terminal are inserted. The gap between the base and the case and the contact portion between the base and the case body are filled with resin for sealing.
In this case, in the conventional hermetically sealed structure, a groove or a recess for guiding the resin is provided on the outer surface of the base so that the molten resin can easily flow into the terminal insertion portion, or the terminal insertion hole is inclined at the opening edge on the inner surface side of the base. A surface portion may be provided to prevent the resin from flowing into the relay.

[0004]

SUMMARY OF THE INVENTION The above conventional closed structure is A8 which is immersed in water at 80 ° C. to 100 ° C. for 1 minute.
It can withstand a normal airtightness test such as 0 or A100. However, when the relay is used in an application such as a vehicle, the conditions such as heat and vibration become severe, and a high degree of leak resistance may be required so as to withstand such a bad external environment. For example, 200 ℃
For example, it is exposed to a temperature exceeding 100 ° C. for a short time, or immersed in water having a temperature close to 100 ° C. for about 10 minutes. The conventional relay structure cannot withstand such a severe test, and it has been impossible to manufacture a product that satisfies the leak resistance with a high yield.

When the relay is mounted on a board or the like,
If heat such as solder is applied to the terminal protruding from the base, the tin plating applied to the terminal surface will melt, and there will be a problem that a gap will be created between the terminal and the sealant at the terminal insertion part of the base. there were. In this case, a leak occurs after the relay is manufactured, so that the inspection is also difficult.

Therefore, the present invention is to solve the above-mentioned problems, and an object thereof is to obtain a sufficient airtightness that can withstand a high temperature for a long time and to prevent a leakage from occurring at the time of mounting the relay. Is to realize the sealing structure.

[0007]

In order to solve the above problems, the relay structure is fitted in a case body for accommodating the relay structure to seal the relay structure, and the terminal piece is led out from the relay structure. In the relay base structure described above, the means taken by the present invention is to form a peripheral inclined surface open to the outer surface side of the base at the peripheral edge portion of the base facing the case body, and to provide a terminal insertion hole for inserting the terminal piece. The inner inclined surface formed on the opening edge on the inner surface side of the base and the outer inclined surface formed on the opening edge on the outer surface side of the base are provided.

Here, it is preferable that the terminal insertion hole is extended along the inside of the protrusion formed from the inner surface of the base toward the inside of the relay, and the inner inclined surface is formed inside the tip.

In this case, further, a small-diameter insertion portion configured to allow the terminal piece to be inserted into the terminal insertion hole on the outer surface side with a slight margin, and the periphery of the terminal piece on the inner side of the relay than the small-diameter insertion portion. It is desirable to provide a large-diameter insertion part configured to secure a space.

[0010]

According to the first aspect of the present invention, since the peripheral inclined surface is formed between the peripheral portion of the base and the case, and the inner inclined surface and the outer inclined surface are formed in the terminal insertion hole, the sealant is prevented. It is easy for the sealant to flow into the peripheral edge of the base and the terminal insertion hole, and the sealant easily penetrates into the gap between the base and the case and the gap between the base and the terminal piece. Since the adhesive area increases due to the presence of, the adhesive strength and airtightness are improved. Further, the formation of the inner inclined surface makes it difficult for the sealant that has entered between the base and the terminal piece to enter the inside of the relay.

According to the second aspect, since the terminal insertion hole is formed inside the protrusion, the bonding distance or the sealing distance between the base and the terminal piece is increased, and the bonding strength and airtightness are further improved. .

According to the third aspect, by providing the small-diameter insertion portion and the large-diameter insertion portion in the terminal insertion hole, the gap between the base and the terminal piece can be reliably sealed in the small-diameter insertion portion, and the large-diameter insertion portion can be inserted. In the portion, it is possible to prevent the airtightness from being destroyed by the heat applied to the terminal piece and the disturbance such as vibration.

[0013]

Embodiments of the base structure of a relay according to the present invention will now be described with reference to the drawings. This embodiment is shown in FIG.
It is applied to the relay shown in (a). This relay is hinge-joined to the electromagnetic coil 2 wound around the coil spool 1, the yoke 3 connected to the iron core 2a of the electromagnetic coil 2, and the yoke 3, and is brought into contact with and separated from the iron core 2a. A movable iron piece 4 configured as described above, and a movable contact 5 attached to the movable iron piece 4 and including an elastic spring member and a contact portion,
It has a pair of fixed contacts 6A and 6B fixed at a position facing the movable contact 5.

The above-mentioned relay structure is hermetically sealed by a case 10 and a base 11 fixed to the case 10. The base 11 has coil terminal pieces 12A and 12B connected to the winding ends of the electromagnetic coil 2, an a-contact terminal piece 15 connected to the fixed contact 6A, and a b-contact terminal piece 16A connected to the fixed contact 6B. , 16B are inserted respectively. 1 formed on the peripheral portion of the base 11.
The common terminal piece 17 connected to the movable contact 5 is inserted into the cutout portion 11c shown in (b).

The base 11 is a synthetic resin plate molded by injection molding, and its outer surface has terminal insertion holes 22A, 22B, 25, 26A, 26B as shown in FIG. 1 (b).
An outer surface side opening is provided. A trapezoidal portion 23 having a shape that avoids the portion where the terminal insertion hole is formed is formed in the central portion of the back surface of the base 11, and the portion where the terminal insertion hole is formed is configured to be one step lower. Terminal insertion holes 22A, 22
Outer taper surfaces 24 are formed at the opening edges of B, 25, 26A, and 26B, respectively, and the inclination angle toward the inside of the holes is set to 45 degrees.

FIG. 2A shows a side surface of the base 11, and FIG. 2B shows an inner surface side of the base 11. In the portion where the terminal insertion holes 22A, 22B, 25, 26A, 26B are formed, the protruding tubular portions 27, 28 protruding inside the relay are formed.
Are formed. The projecting tubular portions 27, 28 have an inner taper surface 2 at the tip end thereof, which has an inclination angle of 45 degrees toward the inside of the hole.
9 is equipped. A frame-shaped portion 11a extending toward the inner surface is formed on the peripheral portion of the base 11, and the outer peripheral surface of the frame-shaped portion 11a contacts the inner peripheral surface of the lower end opening of the case 10. As shown in FIGS. 1A and 2B, a peripheral taper surface 11b having an inclination angle of 45 degrees is formed on the outer surface side of the frame-shaped portion 11a.

FIG. 3A is an enlarged view showing a state in which the base 11 is fixed to the case 10. Base 1
The molten resin is poured into the concave portion surrounded by the trapezoidal portion 23 of No. 1 and the end portion 10 a of the case 10, and the molten resin is solidified to form the resin sealing layer 30. Here, the molten resin wraps around along the peripheral taper surface 11 b of the base 11 to increase the adhesion area between the resin sealing layer 30 and the case 10. Further, there is usually a slight gap between the outer peripheral surface of the frame-shaped portion 11a of the base 11 and the inner peripheral surface of the end portion 10a of the case 10, and the peripheral taper surface 11b is provided with molten resin in this gap. It has an effect of increasing the adhesive strength between the base 11 and the case 10 by invading, and improving the airtightness of the relay. Further, the case 10 of the present embodiment is provided with a draft for removal from the molding die, and in this case, the end 10a has a shape that is open to the outside of the case upper part. When such a draft exists, the gap between the frame-shaped portion 11a and the end portion 10a is slightly open to the peripheral taper surface 11b side, so that the molten resin is more likely to enter the gap.

FIG. 3B is an enlarged view of a portion where the terminal insertion hole 25 is formed. The diameter of the terminal insertion hole 25 is 3/100 to 5/1 between the a-contact terminal piece 15 and the inserted a-contact terminal piece 15.
It is formed so that there is a gap of about 00 mm.
The protruding tubular portion 28 includes the a-contact terminal piece 15 and the terminal insertion hole 25.
The length (height) of the protruding tubular portion 28 is set to a range that does not interfere with the internal structure of the relay and a range that does not interfere with the bent portion or the widened portion of the terminal. It On the outer tapered surface 24, the a-contact terminal piece 1
5 has the effect of increasing the adhesion area between the base 5 and the base 11 and guiding the molten resin into the terminal insertion hole 25, and the inner taper surface 29 increases the adhesion area between the a-contact terminal piece 15 and the base 11. At the same time, it is effective in preventing the molten resin from entering the relay inside more than necessary.

FIG. 3 (c) is an enlarged view showing a portion where the terminal insertion hole 22A for inserting the coil terminal piece 12A is formed. Similar to the terminal insertion hole 25, the outer tapered surface 24 and the inner tapered surface 29 are formed on the inner and outer openings of the terminal insertion hole 22A. In this terminal insertion hole 22A, a small diameter insertion portion 22a is formed on the outer surface side of the base 11, and a large diameter insertion portion 22b is formed inside the protruding tubular portion 27 protruding to the inner surface side of the base 11. Small diameter insertion part 22
A is adapted to insert the coil terminal piece 12A with a slight gap similarly to the terminal insertion hole 25, and the large diameter insertion portion 22b is a protruding tubular portion 27 formed in a rectangular tube shape.
The diameter is enlarged so that there is a certain distance between the coil terminal piece 12A that is formed inside and is inserted.

In the terminal insertion hole 22A shown in FIG. 3 (c),
Molten resin enters the hole from the outer surface side of the base 11, passes through the small diameter insertion portion 22a, and also enters the large diameter insertion portion 22b.
The adhesion area between the base 11 and the coil terminal piece 12A is increased, and the molten resin is prevented from entering the relay. Further, for example, even when the surface plated layer of the tin-plated coil terminal piece is heated and melted by a mounting operation such as soldering, the length of the protruding tubular portion 27 ensures a sufficient adhesive length. Since it is, the airtightness of the relay can be maintained. Even if the terminal piece is not tin-plated, there is a risk that the sealing of the adhesive layer will be broken by disturbance such as heat or vibration. Even in such a case, in the structure of the present embodiment, the large-diameter insertion portion 22b has an effect of blocking heat transfer and absorbing vibrations, so that the durability is significantly improved as compared with the conventional terminal insertion portion sealing structure. It is possible to obtain improved reliability and reliability.

[0021]

As described above, according to the present invention,
Since the peripheral inclined surface is formed between the peripheral portion of the base and the case, and the inner inclined surface and the outer inclined surface are formed in the terminal insertion hole, the sealant easily flows into the peripheral portion of the base and the terminal insertion hole. At the same time, the sealant easily enters the gap between the base and the case and the gap between the base and the terminal piece, and the presence of the peripheral inclined surface and the inner inclined surface and the outer inclined surface increases the adhesion area. Strength and airtightness are improved. Further, the formation of the inner inclined surface makes it difficult for the sealant that has entered between the base and the terminal piece to enter the inside of the relay.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view (a) showing an overall configuration of an electromagnetic relay which should adopt an embodiment of a base structure according to the present invention and a perspective view (b) showing an outer surface shape of an embodiment of a base structure according to the present invention. Is.

FIG. 2 is a side view (a) and a perspective view (b) showing an inner surface shape of the embodiment.

FIG. 3 is an enlarged cross-sectional view (a) showing an enlarged sealing portion between a base and a case and enlarged cross-sectional views (b) and (c) showing the vicinity of the terminal insertion hole in the same embodiment. .

[Explanation of symbols]

 10 Case 11 Base 11a Frame-shaped part 11b Peripheral taper surface 22A, 22B, 25, 26A, 26B Terminal insertion hole 24 Outer taper surface 27, 28 Projected tubular part 29 Inner taper surface

Claims (3)

[Claims] 1. A relay base structure configured to be fitted into a case body for accommodating a relay structure part to seal the relay structure part and to lead out a terminal piece from the relay structure part, wherein: The peripheral edge portion facing the case body is formed with a peripheral inclined surface opened to the outer surface side of the base, and the terminal insertion hole for inserting the terminal piece has an inner inclined surface formed at the opening edge on the inner surface side of the base, A base structure for a relay, comprising: an outer inclined surface formed at an opening edge on the outer surface side of the base. 2. The terminal insertion hole according to claim 1,
A base structure of a relay, characterized in that it extends along the inside of a protrusion formed from the inner surface of the base toward the inside of the relay, and the inner inclined surface is formed inside the tip thereof. 3. The terminal insertion hole according to claim 2,
A small diameter insertion portion configured to insert the terminal piece with a slight margin on the outer surface side, and a space is secured around the terminal piece on the inner side of the relay with respect to the small diameter insertion portion. A base structure for a relay, which is provided with a large-diameter insertion portion.