JPH0150054B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small electromagnetic relay, and more particularly to an improvement in a spring member that presses an armature of a small electromagnetic relay.

As a type of small electromagnetic relay, the inner corner of the bent part of the armature bent into an L-shape is brought into contact with the end face corner of the electromagnetic yoke, and the end face corner of this yoke and the armature A small electromagnetic relay is used in which an armature is swingably supported using a point of contact with an inner corner of a bent portion as a fulcrum.

Therefore, in this type of small electromagnetic relay, sufficient pressing force is applied so that the bent part of the armature comes into contact with the end face corner of the yoke of the electromagnet, and when the electromagnet is de-energized, the armature It is equipped with a spring member that applies a restoring force so that one end separates from the iron core.

FIG. 1 shows an example of a conventional compact electromagnetic relay equipped with such a spring member. That is, in the figure, 1 is an electromagnet, 2 is a yoke, and 3 is an armature, and a bent part 3 of the armature 3 is attached to the end face corner 2a of the yoke 2.
The inner corner part 3b of a is in contact with the inner corner part 3b.

For example, as shown in FIGS. 1 and 2, the spring member 4 has a base 4a on one end side fixed to the case 5, and a fulcrum pressing leaf spring part 4 bent and extended from the base 4a.
b and an armature recovery leaf spring part 4c, the fulcrum pressing leaf spring part 4b abuts on the outer corner part 3c of the bent part 3a of the armature 3, and the inner corner part 3
b is pressed against the end face corner 2a of the yoke 2, and the armature recovery plate spring portion 4c presses the long piece 3d of the armature 3. Therefore, the armature 3 is supported swingably around the end face corner 2a of the yoke 2 as a fulcrum by the pressing force of the fulcrum pressing leaf spring part 4b, and the armature 3 is supported by the pressing force of the armature restoring leaf spring part 4c. Due to the pressure, the armature 3 is always given a restoring force in the direction in which the short piece 3e separates from the iron core 1a, and when the electromagnet 1 is energized, the armature 3 is in the state shown by the chain line in FIG. 1, and the energization is stopped. When released, the armature is rotated by the restoring force of the armature restoring plate spring portion 4c, etc., and enters the state shown by the solid line in FIG. Then, the long piece 3d due to the rotation of the armature 3
This movement drives a movable contact spring (not shown) to open and close the contacts.

Therefore, in order to accurately open and close the contacts of an electromagnetic relay, it is necessary to ensure that the driving force applied to the movable contact spring by the rotation of the armature is always at a stable value. To do this, the inner corner 3b of the armature 3 and the end corner 2a of the yoke 2 should be brought into contact with sufficient pressing force so that the pivot point of the armature 3 does not shift or wobble. At the same time, the restoring force by the restoring leaf spring portion 4c must always be kept at a stable value.

However, in this small electromagnetic relay, since the spring member 4 is minute and the plate thickness is thin, the armature recovery leaf spring part 4c, the bent part 4b' of the fulcrum pressing leaf spring part 4b,
It is difficult to increase the bending accuracy of 4c', and the plate spring part 4c for armature recovery and the plate spring part 4 for pressing the fulcrum are difficult to improve.
Since the spring span b is also short, it is very difficult to reduce the stiffness of the spring and increase the amount of deflection. For this reason, the bending angles of the bent portions 4b' and 4c' in producing the spring member 4, and the bending angles of the bent portions 4b and 4c
A slight difference in plate thickness, length, etc., manifests itself as a large variation in the pressing force on the fulcrum and the restoring force of the armature, resulting in large variations in the characteristics of the electromagnetic relay.

The object of the present invention is to provide an electromagnetic relay that eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is an exploded perspective view showing an embodiment of a small electromagnetic relay according to the present invention.

In the figure, 10 is an electromagnetic block, and 11 is an electromagnetic block.
1 is a yoke, and 12 is an electromagnet. Convex portions 13 are formed on both end sides of the yoke 11.

The contact block 20 is a substantially rectangular insulating member 21 made of synthetic resin or the like, and a conductive member having terminals 22 to 25 formed at one end thereof is molded. These conductive members are coil connection terminals 26 extending to the other ends of the terminals 22 to 25, respectively.
It has a base piece 27, fixed contact plate pieces 28, 29, etc., one end of a movable contact spring 30 is fixed to the base piece 27, and the contact 31 is fixed to the fixed contact plate pieces 28, 29.
are fixed to form a contact spring assembly.

Further, a head 32 is provided approximately in the center of the surface of the insulating member 21 opposite to the surface from which the terminals 22 to 25 protrude.
A fitting hole 33 into which the convex portion 13 of the yoke 31 fits is provided in the head 32 .
Further, on one end side of the same surface from which the head 32 of the insulating member 21 protrudes, a spring member 40 (described later) is provided.
A plurality of locking grooves 34 are provided in a concave shape so as to lock the tip end portion 42b of the second leaf spring portion 42.

The spring member 40 is formed of a metal plate spring, and as shown in FIGS. 4a and 4b, a strip-like plate-like short piece 41a is bent at a more acute angle than the L-shaped armature 50 in a dogleg shape. A first leaf spring portion 41 made of a longer plate-like elongated piece 41b, and this first leaf spring portion 41
From near the tip 41a' of one of the short plate-shaped pieces 41a, bend the bent part 41c of the first plate spring part 41 in a direction gradually moving away from the long plate-shaped piece 41b at the bent part 42a. It is constituted by two band-shaped second leaf spring parts 42, 42 having the same length and the same shape and extending beyond the plate-like piece 41a.

Tip 4 of the plate-like long piece 41b of the first plate spring part 41
A card 43 is insert molded into 1b'. This card 43 has a long side 50a of the armature 50.
A groove 44 into which a fork-shaped insertion piece 51 is inserted is provided on both end surfaces.

As shown in FIG. 5, the armature 50 is bent into a substantially L-shape and has a thin insertion piece 51 inserted into the groove 44 at both ends of the card 43 at the tip of the long side 50a. is formed. Note that 52 is a long plate-shaped piece 4 of the first plate spring portion 41 in order to reduce the weight.
This is an elongated hole carved in the long side 50a in the longitudinal direction in order to create a relief of 1b.

Reference numeral 60 denotes a case with an open bottom surface, 70 a bottom cover that closes this opening, and bottom cover 70 is provided with terminal holes 71 to 74 through which the terminals 22 to 25 pass.

To assemble the electromagnetic relay, the spring member 40 is attached to the back of the armature 50 by inserting the insertion piece 51 at the tip of the long side 50a of the armature 50 into the groove 44 of the card 43, as shown in FIG. Then, as shown in FIGS. 7 and 8, the armature 50 is placed on the back surface of the yoke 11 so that the inner corner 50d of the bent portion 50c contacts the end corner 11a of the yoke 11, and then Seventh,
As shown in Figure 8, two contact blocks 20, 20
The tips 42b of the second spring portions 42 of the spring member 40 are respectively fitted into one of the locking grooves 34 of the electromagnet. Two contact blocks 20, 20 are attached to the bottom of both ends of the block 10. Insert the electromagnet block 10, armature 50, spring member 40, and contact blocks 20, 20 integrally attached into the case 60,
As shown in FIG. 8, the terminals 22 to 25 are passed through the terminal holes 71 to 74, and the opening of the case 60 is closed with the bottom cover 70.

In the small electromagnetic relay assembled in this manner, the first leaf spring portion 41 of the spring member 40 has a dogleg-shaped acute bent portion 41c whose bending angle is slightly larger than that of the first leaf spring portion 41. The tip portion 42b of the second leaf spring portion 42 is pressed open against the force of the spring.
The bending portion 4 resists the springiness of the second plate spring portion 42.
Regarding 1c, the plate-like long piece 41 of the first plate spring part 41
It is in a state where it is bent so as to be pressed toward the b side.

For this reason, the plate-shaped long piece 41 of the first plate spring portion 41
The short piece 50b and the long piece 50a of the armature 50 are pressed against the end face corner 11a of the yoke 11 in a pinched state by the card 43 at the tip of b and the tip 41a' of the short plate-like piece 41a. , inner corner 5 of armature 50
Sufficient pressing force F1 is applied in a state in which 0d is sandwiched from the left and right so that it does not come off from the end face corner 11a, and the armature 50 can freely swing around the end face corner 11a as a fulcrum between the yoke 11 and the spring member. It is in a state where it is supported under pressure between it and 40.

At the same time, the tip end portion 42b of the second leaf spring portion 42 is pushed against the springiness from the state shown in FIG. Therefore, the restoring force of the second leaf spring part 42 is on the base side of the second leaf spring part 42,
That is, it acts as a force to move the tip end 41a' of the short plate-like piece 41a in the direction of arrow C. For this reason, the second
The restoring force due to the leaf spring part 42 is the same as that of the first leaf spring part 4.
1, the armature 50 connects to the end face corner 1 of the yoke 11.
The short piece 50b is rotated around the short plate 41a with the armature 50a held and pressed by the long plate 41b, and the short piece 50b acts as a moment M in the direction of leaving the iron core 12a.

Therefore, when the electromagnet 12 is energized, the armature 50 moves against the short piece 50 against the restoring force of the spring member 40.
a rotates in the direction in which it is attracted to the iron core 12a, and when the energization is canceled, the armature 50 rotates due to the restoring force and the short piece 50b separates from the iron core 12a.

Since the card 43 is in contact with the movable contact spring 30, the movable contact spring 3
0 moves together with the card 43, thereby opening and closing the contacts. Note that this restoring force is applied to the locking groove 3 to which the tip end portion 42b of the second leaf spring portion 42 is attached.
It is adjusted by the selection of 4.

In the spring member shown in FIG. 1, the pressing force to the fulcrum is applied by the fulcrum pressing plate spring part 4b, and the restoring force for rotating the armature is applied by the armature restoring plate spring part 4c. It is given irrespective of the On the other hand, in the small electromagnetic relay of the above embodiment, the first leaf spring portion 41 that comes into contact with the armature 50
and the second leaf spring part 42 integrally extended from the first leaf spring part 41, the pressing force F1 to the fulcrum and the restoring force M for rotating the armature are dynamically The spring properties of the first leaf spring portion 41 and the second leaf spring portion 4 are inseparable from each other.
The above-mentioned pressing force F and restoring force M are provided by the synergistic action of the two spring properties. Therefore, in the conventional spring member 4 shown in FIG. 1, the spring span is the length of the fulcrum pressing plate spring part 4b and the length of the armature recovery plate spring part 4c, whereas in the above embodiment, In the spring member 40, the spring span has a length equal to the sum of the length of the first leaf spring part 41, which reaches almost the entire length of the armature 50, and the length of the second leaf spring part 42, which is much larger than the conventional one. For this reason,
Since the stiffness of the spring can be made much smaller and the amount of deflection of the spring can be made much larger, when creating the spring member 40, the bent portion 41
Even if there are some differences in the bending angle, plate thickness, length, etc. of c, 42a, the degree of influence on the pressing force on the fulcrum and the magnitude of the restoring force will be much smaller, and the Even if there is some variation in accuracy, there will be almost no variation in the characteristics of the electromagnetic relay. In addition, by selecting a plurality of locking grooves 34 (see FIG. 8) for locking the tip end 42b of the second leaf spring portion 42, the pressing force F and restoring force to the fulcrum can be reduced. Since M can be directly adjusted, variations in the pressing force F and restoring force M can be almost eliminated.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made to the configuration of each part without departing from the gist of the present invention. For example, the tip of the spring member 40 The card 43 may simply be brought into contact with the armature 50 without being fixed to the card 43.

Since the compact electromagnetic relay according to the present invention has the above-described configuration, it is possible to eliminate variations in the restoring force and pressing force, and it is possible to eliminate variations in the characteristics of the electromagnetic relay. Furthermore, since high-precision machining is not required for the spring member, the productivity of the spring member is also improved.

[Brief explanation of drawings]

Figure 1 is a front sectional view showing a conventional electromagnetic relay.
2 is a perspective view of the spring member shown in FIG. 1, FIG. 3 is an exploded perspective view showing an embodiment of the present invention, and FIGS. 4a and b
is a perspective view showing the spring member in Fig. 3, Fig. 5 is a perspective view showing the armature, Fig. 6 is a perspective view of the spring member arranged on the armature, and Fig. 7 is a perspective view showing the armature and the armature on the electromagnetic block. FIG. 8 is a perspective view of a state in which a spring member and a contact block are combined, and a sectional view showing an embodiment of the present invention. 10...Electromagnetic block, 11...Yoke, 11
a...End face corner, 12...Electromagnet, 12a...Iron core, 13...Protrusion, 20...Contact block, 21
... Insulating member, 22-25 ... Terminal, 30 ... Movable contact spring, 32 ... Head, 33 ... Fitting hole,
34... Latch groove, 40... Spring member, 41... First plate spring portion, 41a, 41b... Plate piece, 41
a'... Tip, 41c... Bent part, 42... Second
Leaf spring portion, 42a...Bending portion, 42b...Tip, 43...Card, 44...Groove, 50...Archive, 50a...Long piece, 50b...Short piece, 50c...
...Bent part, 50d...Inner corner part, 51...Insertion piece,
52...Long hole, 60...Case, 70...Bottom cover,
71-74...Terminal holes.

Claims (1)

[Claims] 1. L-shaped short piece 50b and long piece 50
The inner corner 50d of the armature 50 consisting of the electromagnet 1
The armature 50 is supported by the yoke 11 in a state in which it is in contact with the end corner 11a of the second yoke 11 so as to be swingable about the end corner 11a as a fulcrum, and the short piece moves away from the electromagnet 12. In a small electromagnetic relay in which a pressing force is applied to the armature 50 by a spring member so as to apply a rotational force to The L-shaped long piece 50a of the armature 50 is configured so that the portions 41a' and 41b' can clamp and press the short piece 50b and the long piece 50a of the armature 50 from the outside on the distal end side away from the fulcrum. a first leaf spring section 41 consisting of a short plate-like piece 41a formed in a bent shape at an acute angle than the short piece 50b and a long plate-like piece 41b longer than the short plate-like piece 41a; The plate-shaped short piece 41a
from the tip 41a' of the short plate-like piece 41a and the long plate-like piece 41b toward the bent part 41c side, and gradually move away from the long plate-like piece 41b with respect to the bent part 41c. The plate-shaped short piece 41a of the first plate spring part 41 is integrally configured with a second plate spring part 42 extending as shown in FIG.
Both tip portions 41a' and 41b' of the long plate-like piece 41b are pushed open from the outside against the springiness of the short piece 50b and the long piece 50a of the armature 50, respectively, on their tip sides away from the supporting points. When the tip portion 42b of the second leaf spring portion 42 is held and pressed in the deformed state as shown in FIG. At the position where it is deformed in the 41b direction,
a pressing force that causes the inner corner portion 50d of the armature 50 to abut against the end face corner portion 11a of the yoke 11 by locking the tip portion 42b of the second leaf spring portion 42;
The short piece 50b of the armature 50 is connected to the electromagnet 1.
A small electromagnetic relay characterized in that a rotational force for rotating the armature 50 in a direction away from the armature 50 is applied while the armature 50 is being held and pressed.