JPH0664982B2 - Small electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> In the present invention, a pair of fixed contact terminals and a pair of common terminals to which movable contact springs fixed to the fixed contact terminals are fixed are made of synthetic resin. The present invention relates to a small electromagnetic relay integrated into a relay base by insert molding.

<Prior Art> Conventional small electromagnetic relays have a structure in which relay contact related parts such as fixed contact terminals and common terminals are press-fitted and fixed to a synthetic resin molded relay base, but the number of manufacturing processes increases. There was a problem with high cost and reliability.

Therefore, the recent compact electromagnetic relay has a configuration in which the relay contact-related parts are integrated with the relay base by insert molding. In this molding process, the relay contact-related parts are supplied in the state of a contact hoop in which a common terminal to which a movable contact spring is pre-welded and a fixed contact terminal are integrated in the same strip.

Therefore, as shown in FIGS. 6 (a) and 6 (b), the contacts 1a of the fixed contact terminal 1 are located on the same line as the fixed contact terminal 1 by integrating them into the same strip. In order to locate the contact 2a of the movable contact spring 2 welded to the common terminal so as to be opposed to the contact 2a outwardly, the contact 1a is formed by the eccentric portion 1d which is horizontally positioned outward through the bent portions 1b and 1c at right angles. Is configured to be displaced outward.

The molding die of the relay base 3 has a mold fitting surface E of the top surface defining mold A and the bottom surface defining mold B and the side surface defining mold C, and the movable contact spring 2 is preliminarily formed before molding. Since the upper surface defining mold A cannot be positioned outward by the movable contact spring 2 because it is attached, the horizontally displaced portion 1d of the fixed contact terminal 1 is fixed to the relay base 3
If it is attempted to be embedded inside, the mold will be further divided, and it will be extremely complicated and expensive, so that it will inevitably be set on the inner side surface of the fixed contact terminal 1 below the offset portion 1d. .

<Problems to be Solved by the Invention> In the conventional small-sized electromagnetic relay, the upper surface of the relay base 3 is located above the bent portions 1d and 1c of the fixed contact terminal 1 because of the above-mentioned molding die. The shape cannot be changed. Although the relay base 3 is provided at a position relatively lower than the fixed contact terminal 1 as described above, the length of the fixed contact terminal 1 projecting downward from the relay base 3 is set to a predetermined value for mounting on a device or the like. Must be set above. on the other hand,
The overall height of the relay base 3 of this type of small electromagnetic relay must be reduced, and as a result, the thickness of the relay base 3 is formed as thin as possible to be flat.
However, in this type of small electromagnetic relay, it is necessary to maximize both the space between the input side coil (not shown) and the output side fixed contact terminal 1 and the insulation distance between the edge faces for safety reasons. It is conceivable to form a recess or the like between the fixed contact terminal 1 and the coil in the relay base 3, but since the relay base 3 is miniaturized, the thickness is kept as small as possible as described above. There is no room to form a recess. Therefore, the space insulation distance and the edge surface insulation distance between the fixed contact terminal and the coil become the shortest linear distance from the coil to the exposed point on the fixed contact terminal 1 on the upper surface of the relay base 3 (that is, the point of the mold mating surface E). , There is a problem with the insulation surface.

<Objects of the Invention> The present invention has been made in view of the above circumstances, and it is possible to reduce the height of the relay base to such an extent that a recess can be formed and to reduce the size and to increase the size of the edge and the space. It is an object of the present invention to provide a small electromagnetic relay capable of obtaining both effects of securing both insulation distances.

<Means for Solving the Problems> In order to achieve the above object, the small electromagnetic relay of the present invention is a relay made of synthetic resin, which is a rectangular parallelepiped as a whole and has a coil installation portion formed at the center of the upper surface. A base, a pair of common terminals integrated in a penetrating state by insert molding at both sides of the coil installation portion on one end side of the relay base, and a pair of common terminals located parallel to the upper surface of the relay base. A pair of movable contact springs, one end of each of which is fixed to the upper end portion, and a pair of movable contact springs, which are integrally formed in a penetrating state by insert molding at both sides of the coil installation portion on the other end side of the relay base, and the central portion of which is outward. A pair of fixed contact terminals, which are bent to have the contact mounting portions at the upper ends facing the multi-end contact mounting portions of the movable contact springs from the outside, and a coil wound around the coil mounting portion. A fixed electromagnetic contact comprising a coil bobbin arranged and an actuator movably provided on one end side of the relay base so as to switch the movable contact springs to the fixed contact terminals by the coil. To the terminal
The relay base is provided with a deviation portion that is inclined outward through a bent portion that is bent outward at an acute angle with respect to a direction orthogonal to the upper surface of the relay base, and is positioned inward by the common terminal in the deviation portion. The fixed contact terminal is insert-molded in the relay base in a state where the portion to be embedded in the relay base is formed, and an insulating distance contact concave portion is formed at the inclusion position of the fixed contact terminal on the upper surface of the relay base, and It is characterized in that a projection piece made of an insulating synthetic resin of the actuator is movably inserted into the concave portion.

<Operation> With the above-described configuration, since the displacement portion is inclined because the contact attachment portion of the fixed contact terminal is displaced outward, the fixed contact terminal is insert-molded in this displacement portion. It is possible to form a die mating surface when performing. Therefore, by forming the fixed contact terminals on the offset portion by bringing the mold matching surfaces of the upper surface defining mold and the side surface defining mold of the relay base as close as possible to the common terminal, The relative position of the upper surface to the fixed contact terminal is significantly higher than that of the conventional one. Therefore, even if the relay base is formed to have a relatively large thickness so that a recess can be formed on the upper surface of the relay base, the relative position of the lower surface of the relay base to the fixed contact terminal is higher than that of the conventional relay base. The size is reduced by lowering the height by the difference in position. In addition, the concave part on the upper surface of the relay base and the exposed point of the fixed contact terminal on the upper surface of the relay base are displaced outward from the bent part to the part corresponding to the common terminal in the deviation part as compared with the conventional product. The edge insulation distance between the coil and the fixed contact terminal is increased, and further, the projection of the actuator is inserted into the recess, so that the bypass is bypassed and the space insulation distance is significantly increased.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the drawings.

1 and 2 are an exploded perspective view and a partially cut front view of an embodiment of the present invention, and FIGS. 3 and 4 are a plan view and a partially cut front view of a relay base, respectively. In these figures, the synthetic resin molded relay base 4 is a flat rectangular parallelepiped as a whole, and a coil installation portion 4a along the longitudinal direction is formed in the central portion, and a coil bobbin fixing concave portion 4b is formed in the front end portion. Is formed, the insulating walls 4c are erected along both sides of the coil installation portion 4a, the insulating recesses 4d are formed on the front side from the insulating walls 4c on the outer sides of the insulating walls 4c, and the coil is formed on both sides of the rear end. An insertion hole 4e for the terminal 11 and a coil bobbin fixing recess 4f are formed respectively.

A pair of fixed contact terminals 6 are formed on both sides of the front end of the relay base 4, and a common terminal 7 is embedded and supported on both sides of the rear end by insert molding. One end of a movable contact spring 8 is formed on the common terminal 7. Previously fixed by spot welding.

Then, as is apparent from FIG. 2 and FIGS. 5A and 5B showing the molding die, the fixed contact terminal 6 has an acute angle with respect to the orthogonal direction of the relay base 4 from the embedded portion 6a. Angle θ
A sloping portion 6c inclined outward at an angle θ is formed via a fold portion 6b that is bent outwards, and this shunt portion 6c is connected to the vertical contact attachment portion 6c through the fold portion 6d. It has been configured.

Also, the coil bobbin 9 has a mounting portion 9b at one end of a hollow rectangular tubular winding core 9a around which the coil 10 is wound, and an insulating plate near the other end.
9c are formed respectively, and fixing projections 9d and 9e respectively projecting from the lower surfaces of the front and rear ends are fitted into the corresponding recesses 4b and 4f of the relay base 4 and fixed on the relay base 4. The pair of coil terminals 11 fixed through the mounting portion 9b are inserted into the insertion holes 4e of the relay base 4. The pair of small pieces 12a on the front end side of the yoke 12 attached to the lower surface of the coil bobbin 9 are bent upward along the insulating plate 9c, and the front end of the core 13 inserted into the winding core 9a has both small pieces 12a.
It protrudes between a.

Further, the actuator 14 for moving the movable contact spring 8 includes an actuator housing 14a formed of an insulating synthetic resin and having a substantially U-shaped cross section, and a holding piece 14b which is hung from the outer surfaces on both sides with a space therebetween. A movable contact spring 8 is inserted between each of the above, and projecting pieces 14c protruding downward from the lower surfaces of both sides of the actuator housing 14a are movably inserted into the recesses 4d of the relay base 4. Also, the inner surface has a U-shaped piece 14d and a pair of small pieces 14e.
And the permanent magnets 15 are adhered between the two small pieces 14e, and the small piece portions 12a of the yoke 12 are inserted with an interval that allows left and right movement inside the U-shaped piece 14d and between the small pieces 14e, respectively. There is a U-shaped piece 14d and one small piece 14e
The tip of the core 13 is inserted between Each mechanical portion is covered and protected by the case 16 fitted and fixed to the relay base 4.

When molding the relay base 4, the molding die is
As shown in FIGS. (A) and (b), the upper surface defining mold F is brought as close as possible to the common terminal 7, and the upper surface defining mold F and the side surface defining mold G are separated from each other. The mold matching surface I can be arranged so as to be formed in the middle of the offset portion 6c of the fixed contact terminal 6. A mold mating surface J between the bottom surface defining mold H and the side surface defining mold G is formed on the lower inner surface of the fixed contact terminal 6.
Therefore, as can be easily understood from the comparison between FIG. 5 (a) and FIG. 6 (a), the upper surface of the relay base 4 is located considerably above the conventional fixed contact terminal 6. Therefore, even if the relay base 4 is formed thicker than the conventional one so that the concave portion 4d can be formed, the lower surface of the relay base 4 is the lower surface of the conventional product as is clear from the comparison with FIG. 6 (a). Since it is located above by the length dimension indicated by K, when the protruding length of the fixed contact terminal 6 from the relay base 4 to the lower side is the same as the conventional product, the lower surface of the relay base 4 is relative to the fixed contact terminal 6. The height can be made lower than the conventional product by the length dimension displaced relatively upward, and the size can be reduced. Further, the insulation between the common terminal 7 and the movable contact spring 8 and the coil 10 on the rear side is made by the insulating wall 4c, and the insulation between the fixed contact terminal 6 and the coil 10 on the front side forms the recess 4d. That is, the exposed point of the fixed contact terminal 6 on the upper surface of the relay base 4 is displaced outward as compared with the conventional product, as is apparent from the comparison between FIG. 5 (a) and FIG. 6 (a). As a result, the edge surface insulation distance is significantly increased. In addition, this fixed contact terminal 6 relay base 4
If the fixed contact terminal 6 is displaced inward by the amount that the exposed point on the upper surface is deviated outward, the base width becomes smaller and the size can be further reduced. Further, the space insulation distance is also increased by being bypassed by the projecting piece 9d.

In addition, the switching action is similar to that of the conventional relay.
This is performed by switching and connecting the movable contact spring 8 to the fixed contact terminal 6 via the actuator 13 by the attraction force of the electromagnet due to energization of 10, and the description thereof is omitted because it is the same as the known technique.

<Effects of the Invention> As described above, according to the small electromagnetic relay of the present invention, the relay base has a simple configuration in which the displacement portion for displacing the contact mounting portion in the fixed contact terminal is inclined outward. Although it is formed to have a relatively large thickness capable of forming a recess for forming an insulating space on its upper surface, the overall height including the relay contact related parts can be made lower than the conventional one, which is extremely rational. With this structure, there is an advantage that the size can be reduced with an inexpensive structure and that the edge surface insulation distance and the space insulation distance can be sufficiently secured by the concave portion and the projecting piece inserted in the concave portion.

[Brief description of drawings]

1 to 5 show an embodiment of a small electromagnetic relay of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a partially cut front view, and FIGS. 3 and 4 are relay bases, respectively. 5A and 5B are a longitudinal sectional view and a plan view, respectively, showing a main configuration of a molding die used for carrying out the present invention. Figures (a) and (b) are a longitudinal sectional view and a plan view showing a partial configuration of a molding die used for manufacturing a conventional relay, respectively. 4 …… Relay base, 4d …… Recessed part 6 …… Fixed contact terminal, 6b …… Bent part 6c …… Deflection part, 6e …… Contact mounting part 7 …… Common terminal, 8 …… Movable contact spring 14… … Actuator, 14c …… Protrusion

Claims (1)

[Claims] 1. A relay base made of synthetic resin, which is a flat rectangular parallelepiped as a whole and has a coil installation portion formed in a central portion of an upper surface, and insert molding at both sides of the coil installation portion on one end side of the relay base. A pair of common terminals that are integrated in a penetrating state, a pair of movable contact springs that are positioned parallel to the upper surface of the relay base and have one end fixed to the upper end of each common terminal, and the relay base It is integrated in a penetrating state by insert molding at both ends of the coil installation portion on the end side, and the center contact portion is bent outward so that the contact attachment portion at the upper end becomes the contact attachment portion at the other end of each movable contact spring. A pair of fixed contact terminals facing each other from the outside, a coil bobbin wound around a coil and disposed in the coil installation portion, and the movable contact springs fixed by the coil A small electromagnetic relay having an actuator movably provided on one end side of the relay base for switching to a point terminal, wherein the fixed contact terminal is bent at an acute angle outward with respect to a direction orthogonal to an upper surface of the relay base. A biasing portion that is inclined outward through the bent portion, and the fixed contact terminal is embedded in the relay base while the portion of the biasing portion located on the inner side of the common terminal is embedded in the relay base. Is formed by insert molding, and an insulating distance setting concave portion is formed at an inner position of the fixed contact terminal on the upper surface of the relay base, and the insulating synthetic resin protrusion of the actuator is movable in the concave portion. Small electromagnetic relay characterized by being inserted.