JPH0328770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay, and more particularly to an electromagnetic relay in which an electromagnet part and a contact part are arranged in the longitudinal direction and housed in an integrated base.

This type of electromagnetic relay has an electronic control mechanism.
It is used for input/output interfaces provided between electronic logic circuits and high-voltage circuits, and it is particularly desirable to reduce the coupling capacitance between the two.
Therefore, the electrical insulation performance between the contact and the coil and between the contact and the ground must be high, and it is expected that the contact will be inexpensive and highly reliable.

FIGS. 1 and 2 respectively show two configurations of conventional electromagnetic relays of this type, and there is no difference between them except for the configuration of the actuating piece, which will be described later. In this way, the electromagnetic relay is composed of an electromagnet part 1 and a contact part 2.
consists of a coil winding 1-1, an armature 1-3, an iron core 1-4, a bobbin 1-5, a connecting piece 1-6, a return spring 1-7, a coil terminal 1-8, an operating piece 1-9, etc. Among these, a magnetic circuit is formed by the armature 1-3, the iron core 1-4, and the connecting piece 1-6.

In this type of electromagnetic relay, when the coil 1-1 is excited by the electromagnet 1, the armature 1-3 is attracted to the iron core 1-4, and when the excitation is released, the armature 1-3 returns. Spring 1-7
It is released from iron core 1-4 by the spring force of
This movement is transmitted to the contact portion 2 via the actuating piece 1-9.

Therefore, in the contact section 2, in conjunction with this operation, the fixed contact 2-6 provided on the fixed contact base 2-1
A contact switching operation can be performed between the movable contacts 2-7 and 2-8 provided on the movable contact plate springs 2-2 and 2-4.

Further, 2-3d and 2-5d are terminal legs of movable contact assemblies 2-3 and 2-5, respectively, 3 is a base, 4 is a case, 5 is a ground terminal, and 5 is a ground terminal.
b is its external connection terminal.

In addition, in FIG. 1, a case is shown in which the actuating piece 1-9 is punched out from a phenolic resin laminate plate or the like using a press, and such an actuating piece 1-9
In this case, the punched cut surface is rough, and therefore abraded powder is produced on the sliding part between the actuating piece 1-9 and the movable plate spring 2-2, and this powder is transferred to the fixed contact 2-6.
and the movable contacts 2-7 and 2-8, thereby deteriorating the contact performance.

Furthermore, since it is punched, it is difficult to form a complicated shape, and therefore the distance between the end 1-3a of the armature 1-3 and the end of the movable contact plate spring 2-2 is _L1 , which is the insulation distance. However, it had the disadvantage of having low shock wave withstand voltage.

Therefore, in order to eliminate such defects, the actuating piece 1-9 of the molded product as shown in FIG.
was devised, but according to this example, armature 1-
Although the above-mentioned insulation distance can be maintained by covering the end portion 1-3a of the actuating piece 1-9 with the actuating piece 1-9 shown in FIG.
The contact characteristics are unstable due to insufficient strength as compared to the contact area, which causes deflection, which requires a lot of effort to adjust.

Furthermore, the armature piece 1-6 and the movable contact plate spring 2-
The distance L ₂ between the two ends is not sufficient as an insulation distance, and the shock wave withstand voltage is not satisfied.

In view of the above-mentioned problems, an object of the present invention is to improve the electrical insulation between the contact part and the electromagnet part so as to be suitable for an input/output interface between an electronic logic circuit and a high-voltage circuit. It is an object of the present invention to provide an inexpensive electromagnetic relay that provides high, reliable and stable contact contact characteristics.

That is, in the present invention, the electromagnet part and the contact part are arranged in the longitudinal direction of the same base, and the contact side end of the electromagnet part is held on the wall part of the base provided at the boundary between the electromagnet part and the contact part. In this way, by the operation of the armature of the electromagnet section, the actuating piece attached to the contact side end of the armature was moved in a direction perpendicular to the longitudinal direction of the base and engaged with the arm of the actuating piece. In an electromagnetic relay in which a movable contact plate spring of a contact part is actuated to perform an opening/closing operation of the contact, the wall part of the base extends toward the armature side, and the end part of the armature on the contact part side is connected to the actuating piece. The armature is press-fitted into the fitting hole of the armature so that the end of the contact side of the armature is covered by the actuating piece so that it is not exposed, and the side of the actuating piece that faces the wall of the base of the arm is closed, and the arm is attached to the base of the armature. It is characterized in that it is arranged along the wall, and the wall of the base and the arm shield between the electromagnet part and the contact part to improve electrical insulation performance.

The present invention will be explained in detail below based on the drawings.

FIG. 3 shows an embodiment of the present invention, in which a bobbin 1-5 has a hole 1-5 for inserting an iron core 1-4 into a flange 1-5a at one end, as shown in FIG.
A groove 1-5c is provided parallel to 5b. Further, as will be described later, a protruding corner 1-5d, a return spring insertion groove 1-5e, and a coil terminal press-fitting groove 1-5f for press-fitting into a predetermined portion of the base 3 are formed in the flange 1-5a. Coil winding 1- wound around bobbin 1-5
Lead line 1-1 at the beginning or end of winding 1
a (see FIG. 3) is led out from the groove 1-5c, wrapped around the leg 1-8a of the coil terminal 1-8, and connected to this leg 1-8a by half-tapping or the like. Coil terminal 1-8
has legs 1-8b for external connection terminals, etc. in addition to the legs 1-8a for connecting the lead wires described above.

Next, as shown in FIG. 4, the iron core 1-4 is inserted into the insertion hole 1-5b of the bobbin 1-5.
4a, and a leg portion 1-4b bent at a substantially right angle to the iron core portion 1-4a. Leg 1-
An armature 1-3 is placed on the end surface 1-4c of the armature 4b as described later, and this end surface 1-4c serves as a hinge surface. The total length of the iron core part 1-4a is the bobbin 1-5.
The armature piece 1-6 and the ground terminal 5 are fitted and fixed to the tip of the iron core 1-4a protruding from the end face 1-5g. That is, square holes 1-6a and 5a are formed in the armature piece 1-6 and the ground terminal 5, into which the tip of the iron core 1-4a is fitted. -6b to the hinge surface 1-4 of the iron core 1-4
so that it is located on the same plane as c.

Here, as shown in FIG. 4, the grounding terminal 5 is made of a substantially square flat plate, and has an external connection terminal 5b at one corner of the lower end for connecting a cord for grounding, and has a square hole 5a. A tongue piece 5c is provided around the periphery. Therefore, connect the ground terminal 5 to the armature 1.
-3, bobbin 1-5, armature piece 1-6, return spring 1
-7 and the actuating piece 1-9 in combination with the iron core 1-4 and installed between the wall grooves 3a and 3b of the base 3, the grounding terminal 5 is connected to the armature piece 1 by the spring force of the tongue piece 5c. The armature 1 - which forms a magnetic circuit by being in pressure contact with the electromagnet part 6 and biasing the parts constituting the electromagnet part 1 toward the wall surface 3c, which is the reference surface of the base 3, and coming into contact with each other.
3. Keep iron core 1-4, armature piece 1-5, etc. at the same potential.

Note that here, the wall grooves 3a and 3b of the base 3
In this case, the surfaces 3f and 3j on the side where the armature 1-3 is attached, that is, the upper surfaces in FIG. , bobbin 1-5, iron core 1-4 and armature piece 1-
When fitting the combination of 6 etc., bobbin corner 1
-5d upper surface 1-5h and upper surface 1-4j of the end surface of iron core 1-4 are biased toward reference planes 3f and 3j.

The armature 1-3 is formed as a flat plate as shown in FIG. 4, and the end 1-3a has a projection 1-3b.
A protrusion 1-3c is formed. An actuating piece 1-9 made of an insulator that transmits the movement of the electromagnet 1 to the contact 2 is press-fitted into the protrusion 1-3c.

Here, the actuating piece 1-9 has an L-shape with sufficient wall thickness as shown in FIG. It is possible to form a shape that does not cause burrs, and there is no burr caused by punching unlike in the conventional case, so there is no risk of powder being generated due to sliding between the leaf springs 2-2 and 2-4. There is no.

1-9b is one leg 1-9a of the actuating piece 1-9.
This is a press-fit fitting hole for the armature protrusion 1-3c provided in the armature, and the end of the movable leaf spring 2-2 is loosely fitted into the other leg (arm) 1-9c, as will be described later. An edge 1-9d that contacts and an end 1-9e that contacts and presses down the movable leaf spring 2-4.
is provided.

As shown in FIG.
-9f is left, and this insulating wall 1-9f has the role of interrupting the electromagnet part 1 and the contact part 2, thereby improving the electrical insulation performance therebetween.

1-3d is an extrusion projection for caulking and fixing the return spring 1-7. The return spring 1-7 is bent into a substantially "H" shape and is fixed to the armature 1-3 via a caulking projection 1-3d, and further includes a spring end 1-7d and its upright piece 1-7c.
and spring insertion groove 1-5e of bobbin 1-5 and iron core 1.
-4 hinge surface 1-4c.

As a result, the armature 1-3 is rotatably engaged with the hinge surface 1-4c on the iron core 1-4 by the return spring 1-7. Also, the armature 1-3 is provided with a hinge surface 1-4c by this return spring 1-7.
A constant return force is applied in the opposite direction to the electromagnetic coil 1-1 around .

Next, the contact portion 2 will be explained. As shown in Fig. 4, the contact section 2 includes a movable contact base 2-3 with movable contact leaf springs 2-2 fixed to the upper and lower sides of the fixed contact base 2-1, and a movable contact leaf spring 2-4 fixed to the fixed contact base 2-1. It consists of a movable contact stand 2-5. Fixed contact block 2-
1 is equipped with a fixed contact 2-6 at the tip 2-1a, and at the other end is a protrusion 2-1b for press-fitting and fixing to the base 3, which will be described later, and a protruding part 2-1b for making the press-fit fixing to the base 3 stronger. Protrusion 2 provided on part 2-1b
-1c, and further has legs 2-1d for external connection terminals bent in a direction perpendicular to the caulked surface on which the projections 2-1c are formed.

On the other hand, the movable contact bases 2-3 and 2-5 have push-out protrusions 2-3a and 2-5a for caulking the movable plate springs 2-2 and 2-4, and a protrusion 2 for press-fitting and fixing the movable leaf springs 2-2 and 2-4 to the base 3. -3b, 2-5b, plate springs with protrusions 2-3c, 2-5c and extruded protrusions 2-3a, 2-5a bent in a direction perpendicular to the caulking surface to further strengthen the press-fit fixation. It has legs 2-3d and 2-5d for external connection terminals.
The movable contact leaf springs 2-2, 2-4 have their end surfaces 2-2
a, 2-4a are provided with holes 2-2b, 2-4b, and these holes 2-2b, 2-4b are provided with movable contact bases 2-3, 2.
-5 extruded protrusion 2-3a provided on the caulking surface;
By caulking 2-5a, the leaf spring 2-2,
2-4 to the contact bases 2-3 and 2-5. In addition, the other ends 2-2c, 2- of the leaf springs 2-2, 2-4
The movable contacts 2-7 and 2-8 are attached to 4c by caulking or the like.

Furthermore, as shown in FIG. 4, upright pieces 2-2d and 2-4d are attached from the parts where the movable contacts 2-7 and 2-8 are attached to the tips of the ends 2-2c and 2-4c, The burrs on the end faces caused by the press working of the leaf springs 2-2 and 2-4 form the edge 1- of the actuating piece 1-9.
Avoid contact with 9d and 1-9e. Thereby, it is possible to prevent the generation of friction powder due to sliding between the edges 1-9d, 1-9e of the actuating piece 1-9 and the burrs of the leaf spring tips 2-2c, 2-4c, and
It is also possible to prevent excess deflection from occurring in the leaf springs 2-2, 2-4.

The movable contact 2-3 to which the movable contact leaf spring 2-2 is fixed, the movable contact base 2-5 to which the movable contact leaf spring 2-4 is fixed, and the fixed contact base 2-1 are shown in FIG. 3, respectively. The base 3 is press-fitted into the positioning grooves 3r, 3s, and 3t in the contact portion 2 of the base 3 and fixed.

Furthermore, by regulating the lower surface of the positioning groove 3r and the upper surface of the positioning groove 3s in relation to the upper surface 3k, which is the reference surface of the groove 3t, the movable contact blocks 2-3 and 2-5 are connected to these grooves 3r and 3s. When the contacts 2-3 and 2-5 are press-fitted into the fixed contact base 2-1, the contacts 2-3 and 2-5 are maintained at positions correctly spaced from the fixed contact base 2-1.

On the other hand, the fixing protrusion 2-1 of the fixed contact base 2-1
In b, a protrusion 2-1f is provided on the surface opposite to the side in contact with the reference surface 3k, and a movable contact base 2-3 is provided.
Fixing protrusion 2-3b and movable contact base 2-5
Protrusions 2-3f and 2-5f are provided on the opposite surface of the fixing protrusion 2-5b from the regulating surface (see FIG. 4).

That is, position regulating means should be provided between the positioning grooves 3r, 3s and 3t in the contact portion 2 of the base 3 and the fixed contact base 2-1 and the movable contact bases 2-3 and 2-5. Accordingly, the fixed contact block 2-1 is moved to the operating position of the movable piece 1-9.
Therefore, the relative positions of the movable contact bases 2-3 and 2-5 can be accurately maintained.

Furthermore, as shown in FIG. 3, the upper wall of the base 3 is provided with a convex portion 3d against which the armature 1-3 comes into contact when returning, and the side wall of the base 3 on the contact portion 2 side is provided with a groove 3h. This groove 3h is a convex portion 4d of the case 4.
(See Figure 4)
When the case 4 is placed on the base 3, the convex portion 4d is fitted into the groove 3h. 3c is return spring 1
-7 It is a convex part for holding. Furthermore, the bottom surface 4a of the case 4 has through-holes 4b for each terminal and holes 4 for each terminal.
A recess 4c for resin sealing is provided around b.

3-1 is an electromagnet part support wall provided at the boundary between the electromagnet part 1 and the contact part 2;
As described above, the end portion 1 of the iron core 1-4 is inserted into the groove 3b of the iron core 1-4.
-4a is installed. In this example, as is clear from FIG. 3, the support wall 3-1 is extended upward as much as possible to shield the armature piece 1-6 and the like from the contact portion 2 side as much as possible. do.

That is, by erecting the supporting wall 3-1 at this position with a wide width, the insulation performance between the electromagnet part 1 and the contact part 2 can be improved.

Next, to explain the operation of the electromagnetic relay configured in this way, the armature 1-3 is normally biased upward as shown in the third figure by the return spring 1-7 and is in contact with the convex portion 3d (return state). It is in. In this state, the fixed contact 2-6 and the movable contact 2-8 are in contact. However, when the coil winding 1-1 is energized, the armature 1-3 is attracted downward (toward the armature piece 1-6 side) as shown in the third figure. As a result, the actuating piece 1-9 attached to the tip of the armature 1-3 moves, and the movable leaf spring 2-2, which was hooked on the edge 1-9d, returns to its original state due to its restoring force. As a result, the movable contact 2-7 attached to the tip of the movable plate spring 2-2 comes into contact with the fixed contact 2-6. On the other hand, the edge 1-9 of this actuating piece 1-9
The movable plate spring 2-4 to which the movable contact 2-8 is attached is biased downward as shown in the third figure by e, and the movable contact 2-8 separates from the fixed contact 2-6.

As explained above, according to the present invention, the electromagnet part and the contact part are arranged in the longitudinal direction of the same base, and the operation of the armature of the electromagnet part allows
The actuating piece attached to the end of the contact part of the armature is moved in a direction perpendicular to the longitudinal direction of the base, and the movable contact leaf spring of the contact part, which is engaged with the arm of the actuating piece, responds, and the contact In an electromagnetic relay that performs opening/closing switching operation, the case wall that holds one end of the electromagnet provided at the boundary between the electromagnet part and the contact part is fixed to the armature and the actuating piece fixed to the contact part side of the armature. It is formed to shield between the electromagnet part and the contact part to the extent that it does not interfere with the contact switching operation, and closes the electromagnet part side of the edge that engages the end of the movable contact plate spring in the operating arm of the actuating piece. The actuating arm shields the area between the electromagnet and the contact, and these members provide double shielding between the two, increasing the dielectric strength between the two. This can improve electrical insulation.

Furthermore, the actuating piece is formed by a molded product,
The edge of the actuating piece, on which the movable contact leaf spring contacts and slides, is a smooth surface free from burrs, and the side of the actuating piece arm where the edge is formed, facing the electromagnet part, remains as a wall surface. By doing so,
This not only prevents the generation of powder due to sliding in this part, but also eliminates the occurrence of deflection, maintains stable contact characteristics, and reduces the need for adjustment. A relay is obtained.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views showing two forms of the configuration of a conventional electromagnetic relay, Figure 3 is a cross-sectional view showing an example of the configuration of the electromagnetic relay of the present invention, and Figure 4 is an exploded view of the entire configuration. FIG. 1...Electromagnet part, 1-1...Coil winding, 1-
1a... Lead wire, 1-3... Armature, 1
-3a...end, 1-3b...protrusion, 1-3c...
...Protrusion, 1-4... Iron core, 1-4a... Iron core, 1-4b... Leg, 1-4c... End face, 1-
4j...Top surface, 1-5...Bobbin, 1-5a...
Flange, 1-5b...hole, 1-5c...groove, 1-5
d... Corner, 1-5e... Insertion groove, 1-5g...
End face, 1-5h...Top surface, 1-6...Archive piece, 1
-6a...Square hole, 1-6b...Top surface, 1-7...
Return spring, 1-7a...tongue, 1-7b...hole,
1-7c... Standing piece, 1-7d... End, 1-8
...Coil terminal, 1-8a...Leg, 1-8b...
leg. 1-9... Actuation piece, 1-9a... Leg, 1-
9b...square hole, 1-9c...leg, 1-9d, 1
-9e...Edge, 1-9f...Insulating wall. 2...Contact part, 2-1...Fixed contact stand, 2-1a...Tip part, 2-1b...Protrusion part, 2-1c...Protrusion, 2
-1d...Leg, 2-1f...Protrusion, 2-2, 2-
4...Movable contact leaf spring, 2-2a, 2-4a...
End face, 2-2b, 2-4b...hole, 2-2c, 2
-4c... End face, 2-2d, 2-4d... Upright piece, 2-3, 2-5... Movable contact stand, 2-3a,
2-5a...Extrusion projection, 2-3b, 2-5b
...Protrusion, 2-3c, 2-5c...Protrusion, 2-
3d, 2-5d...legs, 2-3f, 2-5f...
Projection, 2-6... Fixed contact, 2-7, 2-8...
Movable contacts. 3...Base, 3-1...Wall, 3a,
3b...Groove, 3c, 3d...Protrusion, 3f, 3j,
3k...Reference surface, 3r, 3s, 3t...Groove, 3h
... recess, 3i ... side wall, 3l, 3m ... bottom surface,
3p, 3q...Protrusion, 4...Case, 4a...Bottom, 4b...Through hole, 4c...Recess, 4d...Protrusion, 5...Ground terminal, 5a...Square hole, 5b...External Connection terminal, 5c... tongue piece.

Claims (1)

[Claims] 1. An electromagnet part and a contact part are arranged in the longitudinal direction of the same base, and an end of the electromagnet part on the contact part side is held on a wall part of the base provided at a boundary between the electromagnet part and the contact part. In this way, by the operation of the armature of the electromagnet part, the actuating piece attached to the end of the armature on the side of the contact part is moved in a direction perpendicular to the longitudinal direction of the base and engaged with the arm of the actuating piece. In the electromagnetic relay, the movable contact leaf spring of the contact portion is actuated to perform an opening/closing operation of the contact, wherein the wall portion of the base extends toward the armature side, and the wall portion of the base extends toward the armature side, and The end portion is press-fitted into the fitting hole of the actuating piece to cover it with the actuating piece so that the contact side end of the armature is not exposed, and the side of the arm of the actuating piece facing the wall of the base is closed. ,
The arm is arranged along the wall of the base, and the wall of the base and the arm shield between the electromagnet part and the contact part to improve electrical insulation performance. Electromagnetic relay.