JPH0328769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay, and in particular, to an electromagnetic relay in which an electromagnet part and a contact part are arranged in the longitudinal direction to reduce the coupling capacitance between them, the present invention provides a structure that increases assembly accuracy. That is.

This type of electromagnetic relay has a large number of component parts, and accuracy errors are likely to occur during assembly. It is desirable to be able to easily and accurately determine key dimensions and positioning between parts.

Conventional electromagnetic relays generally consist of an electromagnet part and a contact part, and the electromagnet part is made up of an armature,
It consists of a return spring, an operating piece, an iron core, a bobbin, an armature piece, a coil winding, and a coil terminal, and the armature, iron core, bobbin, and coil winding form a magnetic circuit. In addition, in general relays, by grounding the iron core, armature, and armature piece, noise and surge voltage generated in the high-voltage circuit connected to the contact side are superimposed on the electronic circuit connected to the electromagnet side terminal. There are many things that are suppressing this. In addition, in this type of electromagnetic relay, the armature is attracted to the iron core when the electromagnet is energized, and when the excitation is removed, the armature is released by the spring force of the return spring, so this movement is activated. The signal can be transmitted to the contact portion through the piece, and the contact can be switched. However, in such conventional electromagnetic relays, the operation of the armature of the electromagnet section is transmitted to the contact section through the actuating piece, and the contacts are switched, so that sufficient function as a relay is maintained. Requirements such as pressure between contacts, distance between contacts, timing when switching between normally closed and normally open contacts, play of actuating piece after contact contact, etc. must be managed so that they fall within set ranges. On the other hand, component parts have dimensional variations, and when these dimensional errors are accumulated during assembly, correct accuracy may not be maintained and problems may occur.

Therefore, after the electromagnet part and the contact part are assembled into the base, troublesome adjustments are made mainly on the contact part side, such as correcting the bending of the movable contact leaf spring and the fixed contact stand, which reduces assembly man-hours. Not only does this result in an increase in the number of batteries, but it is also difficult to provide electromagnetic relays with high reliability and stable quality.

It is an object of the present invention to solve these problems, improve the accuracy of the relative position of the electromagnet part and the contact part during assembly, and furthermore It is an object of the present invention to provide an electromagnetic relay that is highly reliable and inexpensive, free from problems caused by assembly errors, by improving the accuracy of relative positions between components.

Therefore, in order to achieve this objective, the inventors of the present invention have conducted various studies and have set a reference plane on the same plane as the upper surface (armature side) of the iron core press-fitted into the hole of the coil bobbin that constitutes the electromagnet section. death,
It was concluded that the electromagnet part and the fixed contact base of the contact part should be pressed and fixed to this reference surface.

That is, in the present invention, an electromagnet part and a contact part are disposed in the longitudinal direction of the same base, and by the operation of the armature of the electromagnet part, a symmetrical contact is made from the fixed contact base of the contact part via an operating piece attached to the armature. An electromagnetic relay configured to actuate a movable contact leaf spring of a movable contact base provided at a position to perform opening/closing switching between a fixed contact of the fixed contact base and a movable contact provided on the movable contact leaf spring. In,
A reference plane is set in the longitudinal direction of the base on the same plane as the upper surface of the armature side of the iron core inserted into the coil bobbin of the electromagnet section, and The upper surface and the upper surface of the iron core, which is press-fitted into the hole of the coil bobbin from the one end side and protrudes from the other end side of the coil bobbin, are pressed toward the reference surface and fixed, and the fixed contact base of the contact portion is fixed by being pressed toward the reference surface, and the movable contact block is fixed by being pressed against a fixed surface set in relation to the reference surface.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an example of the configuration of an electromagnetic relay according to the present invention, in which 1 is an electromagnet part, 2 is a contact part arranged adjacent to the electromagnet part 1 in the longitudinal direction, and 3 is the electromagnet part 1, the contact part 2 4 is a case that protects the relay body and serves as a dustproof cover, and 5 is a ground terminal.

In the electromagnet part 1, 1-1 is a coil winding;
-3 is an armature, 1-4 is an iron core, 1-5 is a coil bobbin, and 1-6 is an armature piece, and these parts form a magnetic circuit. 1-7 is a return spring that is connected to armature 1-3 and maintains the return state of armature 1-3; 1-8 is a coil terminal;
-9 is an actuation piece made of an insulating material. As shown in FIG. 2, the bobbin 1-5 has a hole 1-5 for inserting the iron core 1-4 into the flange 1-5a on one end side.
A groove 1-5c is provided parallel to b. 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 1-1 wound on bobbin 1-5
Lead line 1-1a at the beginning or end of winding
(see FIG. 1) 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 soldering or the like. Coil terminal 1-8 is
In addition to the legs 1-8a for connecting the lead wires described above, there are legs 1-8b for external connection terminals, etc.

Next, the iron core 1-4 is inserted into the insertion hole 1-5b of the bobbin 1-5 as shown in FIG.
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, the armature piece 1-6 and the ground terminal 5 are provided with square holes 1-6a and 5a into which the tip of the iron core 1-4a is inserted. Furthermore, the armature surface 1-6b facing the armature 1-3 is connected 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. 2, 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 a square hole 5a thereof. 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 constitutes a magnetic circuit is pressed against the armature 1-6 and is biased toward the wall surface 3c, which is the reference surface of the base 3, and comes into contact with each other, thereby forming a magnetic circuit.
3. Keep the 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 process, the surfaces 3f and 3j on the side to which the armature 1-3 is mounted, that is, the upper surfaces 3f and 3j in FIG. 1, are used as reference surfaces for assembly, and are molded so that they are on the same plane. FIG. 3A shows the setting of such reference surfaces 3f and 3j, and furthermore, a surface 3l located at a position opposite to these reference surfaces 3f and 3j.
and 3m are provided with protrusions 3p and 3q, and these protrusions 3p and 3q allow the combination of the bobbin 1-5, iron core 1-4, armature piece 1-6, etc. to be connected between the wall grooves 3a and 3b. When fitting, the upper surface 1-5h of the bobbin corner 1-5d and the upper surface 1-4j of the end portion of the iron core 1-4 are biased toward the reference planes 3f and 3j (FIGS. 3B and 3). (See Figure C).

Furthermore, with respect to the upper surface 1-5k of the core insertion hole 1-5b which coincides with the reference planes 1-5h and 1-4j in the assembled state, a lower surface 1-5m of the insertion hole 1-5b opposite thereto is provided in the hole direction. Linear projection 1-
5n, the iron core 1-4a can be biased toward the upper surface 1-5k when the iron core 1-4a is press-fitted into the insertion hole 1-5b, as shown in FIG. 3C. can.

The armature 1-3 is formed as a flat plate as shown in FIG. 2, 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. 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 of the iron core 1-4 by the return spring 1-7. Further, the armature 1-3 is constantly given a return force in the opposite direction to the electromagnetic coil 1-1 around the hinge surface 1-4c by the return spring 1-7.

Next, the actuating piece 1-9 attached to the protrusion 1-3c of the armature 1-3 is formed into a substantially L-shape, as shown in FIG. Square hole 1 into which part 1-3c fits
-9b, and the other leg 1-9c has an edge 1-9 that comes into contact with the movable leaf spring 2-1, as will be described later.
d, form 1-9e. This actuating piece 1-9 is
Armature 1-3, iron core 1-4, and armature piece 1-6, which serve as electrodes for stray capacitance between the coil and the contact.
It serves to electrically insulate between the contact portion 2 and the contact portion 2.

Next, the contact portion 2 will be explained. As shown in FIG. 4, the contact section 2 has a fixed contact base 2-1 sandwiched between them, and a movable contact base 2-3 with movable contact leaf springs 2-2 fixed above and below the fixed contact base 2-1, and a movable contact leaf spring 2-4 fixed thereto. 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.

In this way, the movable contact base 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,
They are press-fitted and fixed into the positioning grooves 3r, 3s and 3t in the contact part 2 of the base 3 shown in FIG. 3k is placed on the same plane as the reference planes 3f and 3j on the electromagnetic section 1 side.

Furthermore, by regulating the lower surface of the positioning groove 3r and the upper surface of the positioning groove 3s in relation to the reference surface 3k, when the movable contact blocks 2-3 and 2-5 are press-fitted into these grooves 3r and 3s, To ensure that the contact blocks 2-3 and 2-5 are maintained at a correct equidistant position from the fixed contact block 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 FIGS. 2 and 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. 2, 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 formed to match the shape of the convex portion 4d of the case 4, and is
When the case 4 is placed on the case 4, the protrusion 4d is fitted into the groove 3h. 3c is a convex portion for holding the return spring 1-7. Furthermore, the bottom surface 4a of the case 4
A through hole 4b of each terminal and a recess 4c for resin sealing are provided around the hole 4b.

Next, to briefly explain the operation of the electromagnetic relay configured in this way, armature 1-3 is always connected.
is biased upward as shown in the first figure by the return spring 1-7 and is in a state of contacting the convex portion 3d (return state). In this state, the fixed contact 2-6 and the movable contact 2-
8 are in contact with each other. However, coil winding 1
-1 is energized, armature 1-3 is connected to the first
It is attracted downward (on the armature piece 1-6 side) as shown in the 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 changes from the fixed contact 2-7 to the fixed contact 2-7.
Contact 6. On the other hand, the edge 1 of this actuating piece 1-9
-9e causes the movable plate spring 2-4 to which the movable contact 2-8 is attached to be biased downward as shown in the first figure, and the movable contact 2-8 separates from the fixed contact 2-6.

Next, a procedure for assembling the electromagnetic relay according to the present invention will be explained with reference to FIGS. 2, 3, A, B, and C. First, the fixed contact base 2-1 of the contact unit 2 is press-fitted into the groove 3t of the base 3. Since the lower surface of the fixed contact base 2-1 is provided with the protrusion 2-1f, the upper surface of the contact base 2-1 can be brought completely close to the reference surface 3k.

Furthermore, when the movable contact blocks 2-3 and 2-5 are press-fitted into the grooves 3r and 3s, respectively, these contact blocks are Since 2-3 and 2-5 are biased toward the regulating surface provided in relation to the reference surface 3k, the movable contact blocks 2-3 and 2-5 are set at appropriate positions relative to the fixed contact block 2-1. can be placed in

Next, in the electromagnet section 1, the armature with the movable piece 1-9 attached, the iron core 1-4, and the bobbin 1-
5, armature pieces 1-6, etc. are press-fitted between the holding grooves 3a and 3b of the base 3,
Here, the upper surface 1-4j of the end of the iron core 1-4 and the upper surface 1-5h of the bobbin corner 1-5d are formed to match the reference surfaces 3j and 3f, and the grooves 3a and 3b are Since the projections 3p and 3q are provided, the surfaces 1-4j and 1-5h are both pressed against the reference surfaces 3j and 3f, allowing accurate positioning.

Furthermore, the armature surface 1-6b of the armature piece 1-6 is connected to the iron core 1.
-4 and the armature 1-3 is on the same plane as the hinge surface 1-4c of the actuating piece 1-9.
Since the actuating piece 1-9 is accurately press-fitted into the
The accuracy of the relative position of the movable contact bases 2-2 and 2-4 to the movable contact bases 2-2 and 2-4 can be sufficiently increased.

Therefore, the electromagnet part 1 remains stationary in the base 3, and the electromagnet part 1 and the contact part 2
It is possible to improve the accuracy of the position of the contact points P and Q (see FIG. 1).

Next, the case 4 is assembled to the base 3 while the external connection terminals of the electromagnet part 1 and the contact part 2 are inserted into the through holes 4b of the case 4, respectively. That is, the convex portion 4d of the case 4 is connected to the concave portion 3h of the base 3.
By fitting into the case 4 and the base 3, the case 4 and the base 3 are integrated. Finally, in order to prevent flux during soldering work from entering the relay body through the through hole 4b through which the external connection terminal is inserted, a recess 4c formed around the through hole 4b is sealed. Fill the gap between the terminal and the through hole by filling it with a stopper resin. Assembly is completed in the above manner.

As described above, according to the present invention, in an electromagnetic relay in which the electromagnet part and the contact part are arranged in the longitudinal direction, the main members constituting the electromagnet part and the fixed contact base of the contact part are arranged in the longitudinal direction of the base. The movable contact block is fixed by being pressed toward a set reference plane, and the movable contact block is fixed by being pushed toward a fixed plane set in relation to the reference plane, so that the tip of the armature During installation, the relative position of the actuating piece that operates in a direction approximately perpendicular to the reference plane mentioned above and the movable contact plate spring attached to the movable contact block, as well as the contact spacing between the fixed contact and the movable contact, can be maintained accurately at the same time. In this regard, it is possible to prevent dimensional variations during assembly, and in relation to this, the contact pressure necessary to maintain the contact performance of the relay and the timing of switching from a normally closed contact to a normally open contact and the actuating piece after contact contact. Since the gap between the movable contact plate springs, etc. can be brought close to the set conditions, an inexpensive electromagnetic relay with high reliability and stable quality can be obtained without the need for subsequent adjustment.

Furthermore, since the base, which is a plastic molded product that can easily maintain a high level of processing accuracy, is provided with setting reference planes, setting fixing surfaces, etc., it is easy to create molds, and there is no need to consider the costs for this. It also becomes easier to maintain and manage the dimensions.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the structure of the electromagnetic relay of the present invention, Fig. 2 is an exploded perspective view of the entirety, and Fig. 3A is a cross-section of the base for explaining the reference plane setting at the base. Figure 3B is a cross-sectional view of the bobbin, coil, and coil terminal assembled, and Figure 3C is a cross-sectional view of the bobbin with an iron core attached and armature pieces etc. attached to the core. , FIG. 4 is an exploded perspective view showing the contact portion of the electromagnetic relay shown in FIG. 1. 1...Electromagnet section, 1-1...Coil winding, 1-
1a...Exit line, 1-2...Yoke. 1-3...
Armature, 1-3a... end, 1-3b...
Projection, 1-3c... Projection, 1-3d... Push-up projection. 1-4... Iron core, 1-4a... Iron core part,
1-4b... Leg portion, 1-4c... End surface (hinge surface). 1-5... Bobbin, 1-5a... Tsuba, 1
-5b...hole, 1-5c...groove, 1-5d...corner, 1-5e...return spring insertion groove, 1-5f...
Coil terminal press-fit groove, 1-5g... end face. 1-6...
... Armature 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...
…edge. 1-8...Coil terminal, 1-8a...
Legs, 1-8b...legs. 1-9... Actuation piece, 1-9
a...Legs, 1-9b...Square holes, 1-9c...Legs, 1-9d, 1-9e...Edges. 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...2-2a, 2-4a standing piece, 2-3,
2-5...Movable contact stand, 2-3a, 2-5a...
Extrusion protrusion, 2-3b, 2-5b... protrusion,
2-3c, 2-5c...protrusion, 2-3d, 2-5
d...Legs, 2-3f, 2-5f...Protrusions, 2-6
...Fixed contact, 2-7, 2-8...Movable contact. 3
...Base, 3-1...Electromagnet storage section, 3-2...
...Contact housing, 3a, 3b...Groove, 3c, 3d...
...Convex portion, 3f, 3j, 3k...Reference surface, 3r, 3
s, 3t...groove, 3h...recess, 3i...side wall,
3j...Reference surface, 3l, 3m...Bottom surface, 3p, 3
q...protrusion. 4...Case, 4a...Bottom, 4b
...Through hole, 4c...Concave portion, 4d...Convex portion. 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 when the armature of the electromagnet part operates, the contact part is provided at a symmetrical position from the fixed contact base of the contact part via an actuating piece attached to the armature. In the electromagnetic relay, the movable contact leaf spring of the movable contact base is actuated to perform opening/closing switching between the fixed contact of the fixed contact base and the movable contact provided on the movable contact leaf spring. A reference plane is set in the longitudinal direction on the same plane as the upper surface on the armature side of the iron core press-fitted into the coil bobbin of the electromagnet section, and an upper surface of a corner formed on a flange on one end side of the coil bobbin of the electromagnet section; The upper surface of the iron core inserted from one end side of the hole of the coil bobbin and projected from the other end side of the coil bobbin is pressed and fixed toward the reference surface, and the fixed contact base of the contact portion is fixed to the reference surface. What is claimed is: 1. An electromagnetic relay characterized in that the movable contact block is fixed by being pressed against a fixed surface set in relation to the reference surface.