JPH06162901A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To restrict the deformation of a movable spring plate by reducing impact force if the impact force is applied in any direction. CONSTITUTION:A movable spring plate 5 is provided with a meandering part 9 between a fixture part to an installation terminal 4 and 9, fixture part to a holding member 6 to be connected to a contact pole. The meandering part 9 is continuously and integrally provided with a first element member 9a which flexes in a direction in which a movable contact 5a and a fixed contact 8a gets closer to/apart from each other, a second element member 9b which flexes 10 a perpendicular direction to the first element member 9a and in a perpendicular direction to a direction for connecting both end parts of the movable spring plate 5 to each other, and a third element member 9b which flexes perpendicularly to the first element member 9a and in a direction connecting both end parts of the movable plate 5 to each other. Impact force in any direction can thus be reduced by action of the first element member 9a, the second element member 9b, and the third element member 9c, thereby the deformation of the movable spring plate 5 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay having a movable spring plate having one end fixed to a body and the other end having a movable contact.

[0002]

2. Description of the Related Art Conventionally, there has been provided an electromagnetic relay in which one end of a movable spring plate is fixed to a mounting terminal embedded in a body. As shown in FIG. 3, this type of electromagnetic relay includes a body 1 made of an insulator that holds a substantially U-shaped iron core 2 around which a coil 3 is wound. The contact terminal 8 is planted. The other end of the movable spring plate 5 having one end fixed to the movable contact 5a is fixed to the tip of the mounting terminal 4 by spot welding or the like. Further, the fixed contact 8a is provided at the tip of the fixed contact terminal 8 so as to face the movable contact 5a.
Is stuck. An armature 7 is coupled to an intermediate portion of the movable spring plate 5 via a holding member 6 made of an insulating material, and the armature 7 is provided near the end of the movable spring plate 5 on the side fixed to the mounting terminal 4 with an iron core. No. 2 of the iron core 2 is in contact with the other leg of the iron core 2 and is in contact with or separated from the other leg of the iron core 2. Therefore, when the coil 3 is energized, the armature 7 is attracted to the iron core 2 and the movable spring plate 5 moves together with the armature 7, and when the coil 3 is de-energized, the spring force of the movable spring plate 5 and the return spring 10 causes The armature 7 returns to the position shown in FIG. In this way, the movable contact 5a separates from and contacts the fixed contact 8a as the end of the armature 7 separates from and contacts the iron core 2.

By the way, in the above-mentioned electromagnetic relay, since the distance between both ends of the movable spring plate 5 is relatively short, if the mounting position of the movable spring plate 5 with respect to the mounting terminal 4 shifts, the movable spring plate 5 will move. The stiffness has changed drastically,
Since the operating characteristics vary greatly, it is required to control the mounting position of the movable spring plate 5 with respect to the mounting terminal 4 with high accuracy.

For the purpose of reducing such variations in operating characteristics, it has been proposed to form a meandering portion 9 in a portion of the movable spring plate 5 between the mounting terminal 4 and the holding member 6 (actual opening). 53-42150). That is, as shown in FIGS. 4 and 5, the meandering portion 9 is formed to extend the length between both ends of the movable spring plate 5 and reduce the stiffness. The change in stiffness with respect to the displacement of the fixing position of the plate 5 with respect to the mounting terminal 4 is reduced, and the movable spring plate 5
That is, the mounting position of the mounting terminal 4 can be managed with relatively low accuracy. In addition, the meandering portion 9 is orthogonal to the first element piece 9a that bends in a direction in which the movable contact 5a separates from and contacts the fixed contact 8a, and is orthogonal to the first element piece 9a and connects both ends of the movable spring plate 5. The second element 9b that bends in the direction of the arrow is continuously and integrally formed.

In the above structure, as shown in FIG. 5, the direction connecting the both ends of the movable spring plate 5 is the X direction, and the direction in which the movable contact 5a separates from and contacts the fixed contact 8a is the Z direction, and the X direction and the Z direction are orthogonal. If the direction is defined as the Y direction, the first element piece 9a in the meandering portion 9 bends in the Z direction, and the second element piece 9b in the meandering portion 9 bends in the Y direction. That is, since the meandering portion 9 having the above-described shape is formed, when the impact force acts in the Z direction or the Y direction, the impact force is relaxed by the first element piece 9a and the second element piece 9b, respectively. This has the advantage that deformation of the movable spring plate 5 is unlikely to occur.

[0006]

However, the movable spring plate 5 does not have a portion for absorbing the impact force in the X direction, and the movable spring plate 5 is easily deformed by the impact force in the X direction. I have a problem. Further, in the above-mentioned structure, the armature 7 is made of iron because the armature 7 is fixed to the mounting terminal 4 at a position where the center of rotation of the armature 7 is different from the center of rotation of the movable spring plate 5. The armature 7 slides on the leg pieces of the iron core 2 when the armature 7 separates from the core 2, and at this time, the armature 7 is moved by the movable spring plate 5 to the iron core 2 or the body 1.
Sliding in the state of being pressed against causes a large frictional force between the iron core 2 or the body 1 and the armature 7. If this frictional force is large, the operation sensitivity is lowered, so that it is necessary to spray a sufficient amount of lubricant on the contact portion of the armature 7 with the iron core 2 or the body 1, which leads to an increase in cost. There's a problem.

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and can reduce the deformation of the movable spring plate by relaxing the impact force in whatever direction the impact force acts. It is intended to provide an electromagnetic relay that reduces the frictional force between the iron core or the body and the armature to improve the stability of operation, simplifies the process of spraying the lubricant, and reduces the cost. To do.

[0008]

According to the present invention, in order to achieve the above object, a body for holding an iron core around which a coil is wound is provided, and a fixed contact terminal having a fixed contact is planted in the body. In addition, a mounting terminal to which the other end of the movable spring plate, which has a movable contact facing the fixed contact at one end, is fixed, is attached to the body, and one end contacts a part of the iron core and the other end In an electromagnetic relay in which a part of the movable spring plate is integrally connected to an armature that can be separated from and connected to the other part of the iron core, and the movable contact is separated from and connected to the fixed contact according to the change of the current flowing to the coil. A first meandering piece which is formed in a meandering portion between a connecting portion of the movable spring plate to the armature and a connecting portion to the mounting terminal, and which is bent in a direction in which the movable contact and the fixed contact are separated from each other. And a second element which is orthogonal to the first element and bends in a direction orthogonal to the direction connecting both ends of the movable spring plate, Perpendicular to the first segment and with each other to form the third segment to flex in the direction connecting the both ends of the movable spring plate in a continuous integral.

[0009]

According to the above construction, the meandering portion is formed in the intermediate portion of the movable spring plate, and the meandering portion has the first element piece that is bent in the direction in which the movable contact and the fixed contact are separated from each other, and the first element piece. A second element piece that is bent in a direction orthogonal to the first element piece and is bent in a direction that is orthogonal to a direction that connects both end portions of the movable spring plate, and a third element piece that is bent in a direction that is orthogonal to the first element piece and that is connected to both end portions of the movable spring plate. Since and are integrally formed,
The meandering portion can be flexed in any direction, and the impact force in all directions can be alleviated, and as a result, the effect of preventing the deformation of the movable spring plate is enhanced. Moreover, since the third piece is bent in the direction orthogonal to the direction in which the movable contact and the fixed contact are separated and contacted and in the direction orthogonal to the direction connecting both ends of the movable spring plate, the armature is attached to the iron core or the body. When attempting to slide, the third piece bends and the slip can be reduced. As a result, the displacement of the fulcrum position of the armature is reduced, and the frictional force acting between the armature and the iron core or the body is reduced. It will be reduced. That is, the operation is stabilized, and the amount of lubricant sprayed can be reduced, which leads to cost reduction.

[0010]

EXAMPLE The basic structure is the same as that of the conventional structure shown in FIG. 4, and as shown in FIG. 1, an iron body having a coil 3 wound around a body 1 made of synthetic resin. The core 2 is mounted, and the body 1 is provided with two mounting terminals 4 and four fixed contact terminals 8. The fixed contact terminal 8 has its tip portion bent in a substantially inverted L shape so that the horizontal pieces face each other in the vertical direction in FIG. 1, and fixed contacts 8a are fixed to the facing surfaces, respectively. The protruding portions of the mounting terminal 4 on the upper surface of the body 1 face each other,
A movable spring plate 5 having a movable contact 5a at one end on the opposite surface.
The other end of is fixed by spot welding or the like. Also,
The movable contact 5a is inserted between the corresponding pair of fixed contacts 8a.

As shown in FIG. 2, the movable spring plate 5 is provided with a holding member 6 made of an insulating material such as a synthetic resin molded integrally at the same time in an intermediate portion, and the armature 7 is interposed via the holding member 6.
Is fixed to the middle part of. One end of the armature 7 is the iron core 2
The other end of the armature 7 contacts and separates from the other leg of the iron core 2. Further, one end of a return spring 10 made of a leaf spring is fixed to the holding member 6, and the other end of the return spring 10 is held by the body 1,
The armature 7 is biased in such a direction that the other end of the armature 7 is pulled away from the other leg of the iron core 2.

In the movable spring plate 5, a meandering portion 9 is formed between a portion fixed to the mounting terminal 4 and a portion fixed to the holding member 6. The meandering portion 9 extends in a direction orthogonal to the first element piece 9a that bends in a direction in which the movable contact 5a and the fixed contact 8a come into contact with each other, and a direction that is orthogonal to the first element piece 9a and connects both ends of the movable spring plate 5. A second element 9b that bends and a third element 9c that bends in a direction orthogonal to the first element 9a and connecting both ends of the movable spring plate 5 are continuously and integrally provided. That is, the meandering portion 9 is a crank shape in which each end of the central straight portion of the three parallel straight portions is connected to the remaining two straight portions through the connecting portion in the direction orthogonal to the straight portion. After punching out the sheet metal so that, one of the outside linear parts is bent at a right angle so that the linear part along the center is aligned, and the connecting part between the other connecting part and the linear part is linear part. It is formed in a bent shape so as to be orthogonal to. The first piece 9a corresponds to two straight line portions, the second piece 9b corresponds to the remaining straight line portion, and the third piece 9c extends over the two straight line portions to be the first piece 9a. It corresponds to a portion that is a connecting portion that is bent so as to be orthogonal to the straight portion. As shown in FIG. 2, if the direction connecting both ends of the movable spring plate 5 is the X direction, the direction in which the movable contact 5a and the fixed contact 8a are separated and contacted is the Z direction, and the direction orthogonal to the X direction and the Z direction is the Y direction. , The first element 9a bends in the Z direction, and the second element 9
b is bent in the Y direction, and the third element piece 9c is bent in the X direction.

Since the meandering portion 9 is formed as described above, the first element piece 9a can be irrespective of which direction the impact force acts.
The impact force can be mitigated by any of the second element piece 9b and the third element piece 9c, and the deformation of the movable spring plate 5 can be prevented. Further, the iron core 2 is excited / de-energized due to the change in the current flowing through the coil 3, the armature 7 abuts on both leg pieces of the iron core 2 during excitation, and the spring force of the return spring 10 causes the armature 7 during non-excitation. One end of the iron core 2 separates from one leg of the iron core 2, and at this time, the movable contact 5a selectively contacts the corresponding pair of fixed contacts 8a. Here, since the rotation center of the armature 7 and the rotation center of the movable spring plate 5 are different from each other, the armature 7 moves relative to the iron core 2 or the body 1 when the armature 7 moves with respect to the iron core 2. Although it tries to slide, the amount of slippage of the armature 7 can be reduced by bending the third piece 9c against the force acting at this time, and as a result, the armature 7 and the iron core 2 or It is possible to reduce the frictional force acting on the body 1. That is, the positional deviation of the rotation center of the armature 7 is reduced, and the operation characteristics are stabilized. Further, since the frictional force is reduced, it is possible to eliminate the step of spraying the lubricant for reducing the frictional force or reduce the amount of the lubricant, which leads to a reduction in manufacturing cost. Of. Further, as in the conventional configuration, the presence of the meandering portion 9 extends the length between both ends of the movable spring plate 5, so that the fixing position of the movable spring plate 5 to the mounting terminal 4 may be slightly displaced. However, the change in the stiffness of the movable spring plate 5 can be reduced, and as a result, the positional accuracy can be easily managed.

[0014]

As described above, according to the present invention, the meandering portion is formed in the intermediate portion of the movable spring plate, and the meandering portion includes the first element piece that bends in the direction in which the movable contact and the fixed contact separate from each other. A second element that is orthogonal to the first element and bends in a direction that connects both ends of the movable spring plate, and a second element that bends in a direction that is orthogonal to the first element and connects both ends of the movable spring plate. Since the third element is continuously and integrally formed, the meandering portion can bend in any direction, and the impact force in all directions can be alleviated.
As a result, there is an advantage that the effect of preventing the deformation of the movable spring plate is enhanced. Moreover, since the third piece is bent in the direction orthogonal to the direction in which the movable contact and the fixed contact are separated and contacted and in the direction orthogonal to the direction connecting both ends of the movable spring plate, the armature is attached to the iron core or the body. When attempting to slide, the third piece is bent and slippage can be reduced. As a result, the displacement of the fulcrum position of the armature is reduced, and the frictional force acting between the armature and the iron core or the body is reduced. It has the effect of reducing it. That is, it is possible to stabilize the operation and reduce the amount of the lubricant sprayed, which leads to a cost reduction.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment.

FIG. 2 is a perspective view showing an armature and a movable spring plate used in the embodiment.

FIG. 3 is a side view showing a conventional example.

FIG. 4 is a perspective view showing another conventional example.

5 is a perspective view showing an armature and a movable spring plate used in the conventional example shown in FIG.

[Explanation of symbols]

 1 body 2 iron core 3 coil 4 mounting terminal 5 movable spring plate 5a movable contact 6 holding member 7 armature 8 fixed contact terminal 8a fixed contact 9 meandering portion 9a first element 9b second element 9c third element

Claims (1)

[Claims] 1. A movable body having a body for holding an iron core wound with a coil, a fixed contact terminal having a fixed contact being implanted in the body, and a movable contact facing the fixed contact at one end. A mounting terminal to which the other end of the spring plate is fixed is planted in the body, and one end contacts one part of the iron core and the other end becomes an armature that can be separated and contacted with the other part of the iron core. In an electromagnetic relay in which a part of the movable spring plate is integrally connected and the movable contact is separated from and contacted with the fixed contact according to the change of the current flowing to the coil, in the connecting part of the movable spring plate to the armature and the mounting terminal. A meandering part is formed between the connecting part and the meandering part, and the meandering part bends in a direction in which the movable contact and the fixed contact separate from each other, and both end parts of the movable spring plate which are orthogonal to the first piece and are movable. A second element that bends in a direction orthogonal to the direction that connects the first and the first element and that bends in a direction that connects both ends of the movable spring plate. An electromagnetic relay characterized by being formed integrally with a third element.