JPS64685Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an electromagnetic relay.

Conventionally, when attaching a printed circuit board to an electromagnetic relay, as shown in FIG. fastened by means of
The printed circuit board 3 is fixed by fitting protruding pieces 2c at the tips of the leg pieces 2b projecting upward from both sides of the holding frame 2 into the recesses 3a on both sides of the printed circuit board 3.

However, in the case of the conventional example, the printed circuit board 3
Since a predetermined insulation distance is required between the copper foil 4 and the holding frame 2, as well as between the electronic component 5 mounted on the bottom side and the holding frame 2, the effective mounting area of the printed circuit board 3 becomes small. There were flaws.

This invention was created in view of the above-mentioned drawbacks.
The purpose is to provide an electromagnetic relay that does not require insulation between the printed circuit board and the holding frame, allows for a large mounting area on the printed circuit board, and can easily interrupt the heat generated by the relay mechanism.

The present invention will be explained below with reference to examples. In the relay mechanism, a fixed contact terminal 7 and a coil terminal 8 are implanted in a base 6, and an inverted L-shaped yoke 1 is erected on the rear upper surface of the base 6. In the yoke 1, an iron core 10 having a coil 9 wound thereon is fixed to a vertical piece 1a, and an armature 11 is pivotally supported at the tip of a horizontal piece 1b. Further, above the horizontal piece 1b, a printed circuit board 3 having an electronic component 5 wired thereon is firmly supported via a holding frame 12. The holding frame 12 is made of a synthetic resin molded product, and has stepped protrusions 13 that serve as spacers integrally protruding from the center of the front end and both sides of the rear end of the upper surface. The printed circuit boards 3 are mounted and supported on the upper surface of the wide-diameter portion of the stepped projection 13 by being inserted from below into mounting holes 14 that are bored corresponding to the printed circuit boards 3, respectively. In this case, the printed circuit board 3 is mounted with the electronic component 5 mounting side facing upward and the copper foil side facing downward. In addition, leg pieces 12a are integrally provided at both ends of the center of the lower surface of the holding frame 12, and are bent into a substantially Z-shaped cross section and protrude outward at the bottom, and one of the leg pieces 12a has a lower end horizontally extending inward. It is further bent to form a U-shaped engaging portion 12b with openings on the inside and front and rear sides, and grooves 12c, 12c, which are cut out in a U-shape, are bored at the lower front ends of both leg pieces 12a. .

Thus, this holding frame 12 first engages the side edge of the horizontal piece 1b of the yoke 1 with the U-shaped engaging portion 12b. After that, in this state, attach the holding frame 12 to the yoke 1.
When the horizontal piece 1b is slid toward the tip side, the horizontal piece 1b
A protrusion 15 protruding from both sides of the tip of the groove 12
c, 12c, and the holding frame 12 is supported and fixed in a state where it just straddles above the horizontal piece 1b of the yoke 1. In the figure, 16 is a return spring, 17 is a movable contact plate, and 18 is a lead wire.

A case (not shown) is attached to the relay mechanism assembled in this way, and the desired electromagnetic relay is completed.

As described above, the present invention has an inverted L shape in which one tip of the leg pieces 12a, 12a of the synthetic resin holding frame 12 extends outward and the tip of the extending piece hangs downward. , the tip of the other leg piece 12a extends outward and the tip of the extending piece extends inward to form a U-shaped engagement portion 12b, and each leg piece 12
A groove 12c,
12c is formed with a notch, and projections 15 are provided to protrude outward from both ends of the horizontal piece 1b of the yoke 1, and the grooves 12c, 12c are engaged with these projections 15, respectively. The side edge is connected to the U-shaped engaging portion 12.
Since the holding frame 12 is supported and fixed above the yoke 1 by engaging with the metal holding frame 1, insulation between the electronic component and the metal holding frame and between the metal holding frame and the copper foil of the printed circuit board is reduced. There is no need to consider this, and therefore the mounting area of the printed circuit board can be increased.In particular, since the electronic components are arranged on the top surface of the printed circuit board, the electronic components are less susceptible to the thermal effects of heat generated from the relay mechanism, and This has the effect of providing a sufficient insulation distance between the terminals of the component and the yoke, and since the structure is as described above, by bringing the side peripheral edge of the holding frame close to the inner wall of the case, the upper and lower parts of the holding frame can be The inside of the case can be partitioned to block the heat generated by the relay mechanism, making it possible to protect electronic components.The holding frame not only holds the printed circuit board, but also has insulation and heat-blocking functions. The protective frame can sufficiently eliminate the effects of heat generation from the relay and ensure an insulating distance from the yoke.
This eliminates the need to increase the distance between the printed circuit board and the yoke, which has the effect of reducing the size.Furthermore, since the printed circuit board block itself can be supported only by the yoke itself, it is easier to engage the printed circuit board with the case. This has the effect that there is no need to add means such as grooves.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the conventional example, Fig. 2 is an exploded perspective view of the present invention, Fig. 3 is a side view of the same, Fig. 4 a,
b and c are a top view, a side view, and a front view, respectively, of the holding frame used as above, 1 is a yoke, 3 is a printed circuit board, 5 is an electronic component, 12 is a holding frame, 12a is a leg piece, and 12c is a groove. , 15 are protrusions.

Claims (1)

[Claims for Utility Model Registration] A synthetic resin holding frame 12 having a stepped protrusion 13 protruding from its upper surface and leg pieces 12a, 12a protruding downward from the center of both sides of its lower surface, and an electronic component disposed therein. The printed circuit board 3 is supported by the wide diameter portion of the step projection 13 by inserting the narrow end portion of the stepped projection 13 into the mounting hole 14, and the hanging piece 1a formed in an inverted L shape is erected on the base 6 and horizontally mounted. A yoke 1 is attached with an iron core 10 having a coil 9 wound around a vertical piece 1a so as to be parallel to the piece 1b, and the yoke 1 is pivoted to the tip of the horizontal piece 1b of the yoke 1 so that it can be freely attracted to the tip of the iron core 10. The armature 11 is formed into an inverted L shape with the tip of one of the leg pieces 12a extending outward and the tip of the extending piece hanging downward, and the other leg A U-shaped engagement portion 12b is formed by extending the tip of the piece 12a outward and extending the tip of the extending piece inward, and the tip of each leg piece 12a, 12a is extended. Groove 12 on the front edge of the piece
c, 12c are formed with notches, and protrusions 15 are provided to protrude outward from both ends of the horizontal piece 1b of the yoke 1, and the grooves 1 are formed in these protrusions 15.
2c and 12c, respectively, and the horizontal piece 1 of the yoke 1
An electromagnetic relay in which the holding frame 12 is supported and fixed above the yoke 1 by engaging the side edge of the side edge b with the U-shaped engaging portion 12b.