JPH065183A - Seesaw type electromagnetic relay - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve productivity by facilitating matching adjustment work between the attraction force characteristic and the spring load characteristic of the movable contact spring for the magnetic poles facing the iron core in the seesaw type electromagnetic relay. To aim. [Structure] An electromagnet completed body 12 having a permanent magnet, an armature rotating in a seesaw shape with respect to the permanent magnet 12c by a linear protrusion 13c protruding in the longitudinal direction central portion width direction, and a movable contact integrally formed therewith. the spring 13a _-1, movable contact spring complete 22 consisting 13a _-2 Prefecture, each movable contact spring 13a _-1, external connection terminal fixed to a position corresponding to the contact zone of 13a _-2 are arranged also movable The contact springs 13a- ₁ and 13a- ₂ are composed of a tongue protruding from an intermediate portion in the longitudinal direction and a completed base body 11 in which fixed external connection terminals connected to the tongue are arranged at positions corresponding to the tongue. A seesaw-type electromagnetic relay, which is configured by forming a convex stepped surface lower than the protrusion in a region following the linear protrusion 13c on both sides of the linear protrusion of the armature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a seesaw type electromagnetic relay in which a movable contact spring having contacts at both ends and a fixed external connection terminal connected to the movable contact spring at an intermediate portion are joined, The present invention relates to a seesaw-type electromagnetic relay that improves productivity by facilitating matching adjustment work between attraction force characteristics and spring load characteristics of a movable contact spring with respect to an iron core facing magnetic pole.

[0002]

2. Description of the Related Art FIG. 3 is a diagram for schematically explaining the structure of a conventional seesaw type electromagnetic relay, in which (3-1) is a perspective view of the structure,
(3-2) is a side view showing a cross section when the (3-1) is cut along a to a '.

In the figure, the case of an electromagnetic relay having one transfer and two circuits will be described as an example. In FIG. 3, a seesaw-type electromagnetic relay (hereinafter simply referred to as an electromagnetic relay) 1 is roughly classified into an external connection terminal 11a serving as a common terminal and a break contact terminal arranged at predetermined positions on both sides of a housing substrate (not shown). A base completed body 11 in which an external connection terminal 11c, an external connection terminal 11b that serves as a make contact terminal, and an external connection terminal 11d that serves as a coil terminal are fixed and planted in two rows, and each on the base completed body 11 The electromagnet completed body 12 fixed between the external connection terminal rows, and a seesaw-shaped rotation with respect to the electromagnet completed body 12 via linear projections as pivot axes on the permanent magnets constituting the electromagnet completed body 12. It is composed of a movable contact spring complete body 13 that can move.

The completed electromagnet 12 has a permanent magnet 12 between both ends of a U-shaped iron core 12b around which a coil 12a is wound.
c is fixed and configured. Further, the movable contact spring complete body 13 is formed by molding the movable contact springs 13a _-1 , 13a _-2 forming a pair in parallel and the armature 13b positioned in parallel in the middle between them into the insulator 14. Means that a projection 13c as a pivot shaft formed in the widthwise direction at the longitudinal center of the armature 13b comes into contact with the permanent magnet 12c at a corresponding position on the permanent magnet 12c.
On the other hand, it can rotate like a seesaw like an arrow b.

Further, in this state, the movable contact spring is completely
Each movable contact spring 13a of the adult 13_-1, 13a _-2Both ends of
External connection end that will be the break contact terminal of completed base 11
Child 11c and external connection terminal 11b which is a make contact terminal
Corresponding to the position of each movable contact
Point spring 13a_-1, 13a_-2The width of the insulator 14 branched from the central part of
The extra length area A such as U shape protruding from the direction side
The tongue 13a 'that it has has its free end 13a "
Corresponding to the external connection terminal 11a which is the common terminal of the adult 11
It is supposed to be located.

In this case, the movable contact springs 13a _-1 , 1,
3a _-2 , the both ends of each of them are alternately alternated to the external connection terminal
, 11c and the spring material such as phosphor bronze must be formed with a thickness such that they can be easily bent in order to make almost simultaneous contact with a fixed contact pressure. Since the terminals 11a to 11d are to mount the electromagnetic relay 1 on a circuit board or the like located outside, it is necessary to use a strong material. As a result, the material is replaced with the material of the movable contact spring, that is, the spring material. In addition, the strength improving means such as increasing the thickness is adopted.

Therefore, the free end 13a "of the tongue piece 13a 'and the joining region of the external connection terminal 11a are joined by a welding technique such as a laser.
The power supply line 12a 'connected to the coil 12a of 12 is connected to the external connection terminal 11d which serves as a coil terminal of the completed base body 11, but a predetermined potential is not applied to the external connection terminal 11d and thus the coil 12a. Then, one end of each of the movable contact springs 13a _-1 , 13a _-2 of the movable contact spring completed body 13 comes into contact with the external connection terminal 11c serving as a break contact terminal, and a predetermined potential is applied to the external connection terminal 11d and thus the coil 12a. When applied, the other ends of the movable contact springs 13a _-1 , 13a _-2 come into contact with the external connection terminal 11b serving as a make contact terminal.

This is because the external connection terminal 1 in the normal state
It means that the conduction between 1a to 11b can be switched to the conduction between the external connection terminals 11a to 11c only when a predetermined potential is applied to the external connection terminal 11d.

Therefore, by applying or releasing a potential to the external connection terminal 11d, the electromagnetic relay 1 whose circuits are switched can be constructed. In such an electromagnetic relay 1, the completed electromagnet 12 is, in other words, the completed base body.
Since the rotation of the movable contact spring completed body 13 with respect to 11 is absorbed by the bending of the tongue piece 13a 'formed in each movable contact spring 13a- ₁ and 13a- ₂ in the extra length area A, stable characteristics are maintained for a long period of time. There is an advantage that a relay that can be secured can be configured.

[0010]

FIG. 4 is a diagram showing the relationship between the attraction force characteristic and the spring load characteristic of the electromagnetic relay 1, FIG.
FIG. 5 is a diagram for explaining the problem. Particularly, in FIG. 5, a portion (arrow B in FIG. 3) related to the present invention is shown in an enlarged view, and therefore the same target members and portions as those in FIG. It is shown with a symbol.

In the graph shown in FIG. 4, the vertical axis Y ₁ represents the attraction force with respect to the end face of the U-shaped iron core on the break contact side of the movable contact spring completed body 13 as positive and negative values centered on "0", and the vertical axis Y ₂ represents The attraction force for the end face of the U-shaped iron core on the make contact side of the completed body 13 is taken as positive or negative centered on "0", and the horizontal axis X represents the stroke of the armature 13b.

Therefore, when the attraction force characteristic to the U-shaped iron core at each end piece of the armature of the movable contact spring completed body 13 of the electromagnetic relay 1 explained in FIG. 3 is displayed in the graph, the open attraction force is represented by the curve C ₁ , the attractive attraction. The force can be represented by the curve C ₂ , respectively.

Further, the spring load characteristics of the movable contact springs 13a _-1 , 13a _-2 which rotate together with the movable contact spring complete body 13 in a seesaw shape are as follows. The stiffness at can be represented by a polygonal curve C ₃ .

On the other hand, in order to realize stable circuit switching by the electromagnetic relay 1, it is necessary to make the contact pressure of the movable contact springs 13a _-1 , 13a _{-2 to} the external connection terminals 11b, 11c close to a required value. However, this means that the polygonal curve C ₃ must be located between the above-mentioned curves C ₁ and C ₂ .

However, the movable contact springs 13a _-1 , 13a _-2 are apt to be deformed or bent in the above-mentioned exposed regions, for example, the hatching shown by the curved line C ₃ ′ shifted to one side (lower side in the figure). As in the areas P ₁ and P ₂ , the curve C ₁ and the curve C ₂ may protrude, and as a result, stable circuit switching may not be realized.

Therefore, as shown in FIG. 5, the exposed regions of the movable contact springs 13a _-1 , 13a _-2 (only 13a _-1 is shown in the figure) are sandwiched by, for example, a tool 15 shown by a broken line and displaced in the thickness direction. Therefore, the shifted spring load characteristic curve C ₃ ′ is corrected to a required curve C ₃ so that it is positioned between the curves C ₁ and C ₂ .

Therefore, in the electromagnetic relay 1 having the conventional structure, it is often necessary to manually adjust the spring load characteristic, and it takes a lot of man-hours by a skilled worker to construct a required electromagnetic relay. At the same time, there was a problem that productivity could not be expected to improve due to a decrease in yield due to variations in various properties after completion.

[0018]

Means for Solving the Problems The above-mentioned problems are solved by an electromagnet completed body in which a permanent magnet is fixed to an opening between both poles of a U-shaped iron core in which a coil is wound in an intermediate portion, and both poles of the U-shaped iron core. And a contact point at both ends of the armature that can rotate in a seesaw shape with respect to the permanent magnet with the linear protrusions formed by projecting in the width direction at the center in the longitudinal direction at positions corresponding to the two sides in the longitudinal direction. Movable contact spring completed body having a movable contact spring integrally formed with the armature while maintaining insulation, and each contact area of the movable contact spring of the movable contact spring completed body that rotates like a seesaw. A fixed external connection terminal that comes into contact with or separates from each contact area is disposed at a position corresponding to the tongue piece at a position corresponding to the tongue piece protruding from the middle portion in the longitudinal direction of the movable contact spring. Fixed external connection terminal connected to one side A seesaw-type electromagnetic relay configured with an installed base complete body, wherein the armatures on the both sides of the linear protrusion are formed on a step surface of a convex lower than the linear protrusion. It is achieved by a seesaw type electromagnetic relay configured as follows.

[0019]

In general, since the attractive force characteristic of the seesaw type electromagnetic relay is determined by the magnetic field path formed by the armature and the permanent magnet, the attractive force characteristic can be changed by changing the magnetic field path.

Therefore, in the present invention, the armature described with reference to FIG.
The above-mentioned magnetic field path is changed by adding convex step surfaces on both sides of the linear protrusion 13c serving as the pivot axis of 13b so as to be able to approach the permanent magnet 12c contacting with the linear protrusion 13c.

Particularly in this case, the attraction force characteristics due to the magnetic field path formed between the armature and the permanent magnet are shown on one side (lower side in the figure) as shown by the chain lines C ₁ ′ and C ₂ ′ in FIG. Can be shifted to, the attraction force characteristics C ₁ ′, C ₂ ′ of
By appropriately setting the shift amounts for C ₁ ′ and C ₂ ′, the spring load characteristic curve C ₃ before adjustment and the spring load characteristic curve C ₃ ′ after adjustment of the movable contact springs 13a _-1 , 13a _-2 described above are set. It is possible to configure an electromagnetic relay having a suction force characteristic that satisfies both of

Therefore, it is possible to expect an improvement in productivity by reducing manual work by a skilled worker.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 exemplifying the case of the electromagnetic relay explained in FIG. 3 is a cross-sectional view showing an example of the main configuration of an electromagnetic relay according to the present invention, which is taken along line a-a in (3-1) of FIG. ′ Sectional view, that is, the area corresponding to (3-2) is shown.

FIG. 2 showing a cross section of the same region as FIG. 1 is a diagram showing another configuration example. Note that both FIGS. 1 and 2 are examples of the case of the electromagnetic relay described in FIG. 3, so the same target members and parts as those in FIG. 3 are designated by the same reference numerals, and duplicate description is omitted. .

The electromagnetic relay 21 according to the present invention shown in FIG.
It is composed of the completed base body 11, the completed electromagnet body 12 and the completed movable contact spring body 22 described in 1. In particular, in this case, the movable contact spring completed body 22 has only the armature 13b constituting the movable contact spring completed body 13 of FIG.
Magnetic plates made of the same material as the armature 13b on both sides of c
23 is replaced with an armature 24 formed by attaching it by means such as welding, and the other structure is the same as that of the completed movable contact spring body 13.

In the electromagnetic relay 21 having such a configuration, the magnetic field path between the armature 24 of the movable contact spring completed body 22 and the permanent magnet 12c of the electromagnet completed body 12 has a pivot shaft 13 in FIG.
In addition to c, the attraction force characteristic as the electromagnetic relay can be improved because the magnetic plate 23 is interposed, and the attraction force characteristic curves C ₁ and C ₂ as the electromagnetic relay 1 in FIG. 3 are described in FIG. Can be shifted like C ₁ ′, C ₂ ′.

Further, in this case, the attraction force characteristic curve C ₁ ′,
The shift amount of C ₂ ′ with respect to C ₁ and C ₂ can be changed by the size of the magnetic plate 23 attached to the armature 13b. Therefore, by appropriately setting the size of the magnetic plate 23, as shown in FIG.
It is possible to eliminate the work of adjusting the movable contact springs 13a _-1 , 13a _-2 described above, and it is possible to improve productivity by improving work efficiency.

FIG. 2 showing another configuration example shows an example in which the armature 24 in FIG. 1 is formed without attaching the magnetic plate 23. That is, the electromagnetic relay 31 is configured by the completed base body 11, the completed electromagnet body 12 and the completed movable contact spring body 32 described in FIG.

The movable contact spring complete body 32 in this case
Means that only the armature 13b described with reference to FIG. 3 is attached to both side regions of the pivot shaft 13c on the pivot shaft forming surface.
Armature with a convex step surface 13d lower than the height of
It is replaced by 33, and the other structure is the same as that of the completed movable contact spring body 13.

In the electromagnetic relay 31, as in the case of FIG. 1, by appropriately setting the size of the step surface 13d, the shift amount of the attraction force characteristic curves C ₁ ′, C ₂ ′ with respect to C ₁ , C ₂ is changed. Therefore, the same effect as in FIG. 1 can be obtained without using the magnetic plate 23 described in FIG. 1, and the productivity can be further improved as compared with the case of FIG.

[0031]

As described above, according to the present invention, the seesaw-type electromagnetic wave whose productivity is improved by facilitating the matching adjustment work between the attraction force characteristic and the spring load characteristic of the movable contact spring for the iron core facing magnetic poles. A relay can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration example of a main part of an electromagnetic relay according to the present invention.

FIG. 2 is a diagram showing another configuration example.

FIG. 3 is a diagram schematically illustrating a configuration of a conventional seesaw-type electromagnetic relay.

FIG. 4 is a diagram showing a relationship between an attraction force characteristic and a spring load characteristic of the electromagnetic relay.

FIG. 5 is a diagram illustrating a problem.

[Explanation of symbols]

11 Completed base 12 Completed electromagnet 12c Permanent magnet 13a _-2 Moving contact spring 13c Linear protrusion 13d Step surface 14 Insulator 21,31 Seesaw type electromagnetic relay 22,32 Complete moving contact spring 23 Magnetic plate 24,33 Armature

Claims (3)

[Claims] 1. An electromagnet completed body (12) having a permanent magnet (12c) fixed to an opening between both poles of a U-shaped iron core having a coil wound in the middle, and both poles of the U-shaped iron core. The armature that can be turned like a seesaw with respect to the permanent magnet (12c) with the linear protrusions (13c) that are formed by projecting in the widthwise direction at the central portion in the longitudinal direction at both ends in the longitudinal direction. And a movable contact spring complete body (22) composed of movable contact springs (13a _-1 , 13a _-2 ) integrally formed with the contact area at both ends and keeping insulation with the armature, and a seesaw-shaped winding. Moving contact springs (13a _-1 , 13a _-2 ) of the moving contact spring completed body (22) that moves
A fixed external connection terminal that comes into contact with or separates from each contact area is provided at a position corresponding to each contact area of the movable contact springs (13a _-1 , 13a _-2 ). A seesaw-type electromagnetic relay comprising a completed base body (11) having fixed external connection terminals connected to the tongue piece at a position corresponding to the tongue piece protruding from the armature. Is the linear projection on both sides of the linear projection (13c).
(13c) A seesaw-type electromagnetic relay characterized by being formed on a convex step surface lower than (13c). 2. The convex step surfaces formed on both sides of the linear protrusion of the armature according to claim 1 are formed by attaching magnetic plates (23) thinner than the height of the linear protrusion. A characteristic seesaw type electromagnetic relay. 3. A step surface (13d) formed by a forming means which is the same as the linear projection forming means of the armature, wherein convex step surfaces formed on both sides of the linear projection of the armature according to claim 1. Seesaw type electromagnetic relay characterized by being configured with.