JPH0724769Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnetic relay, and more particularly to a mounting structure for a pair of leaf springs on a movable block.

(Prior Art) Conventionally, as an electromagnetic relay, for example, FIGS.
As shown in the figure, the movable block 6 formed by holding the movable table 7 between the pair of leaf springs 8 and 8 is formed based on the excitation and demagnetization of the electromagnet block 5 in the directions of arrows m and n in FIG. There is one that opens and closes the contact by reciprocating.

The electromagnet block 5 is a spool 5b having an iron core 5a inserted therethrough.
A yoke 5c and a coil terminal 5d (the coil is not shown in FIG. 13) are provided on the. Further, 1 is a base, 2 is a shield plate, 3 and 3 are terminal blocks, 4 is a positioning metal fitting for positioning one end of the leaf springs 8 and 8 in the groove portions 1a and 1a of the base 1, and 6a.
Is a movable contact piece press-fitted and fixed to the movable table 7, 6c is a permanent magnet held by a pair of movable iron pieces 6b, 6b and press-fitted and fixed to the movable table 7, and 9 is a case.

(Problems to be solved by the invention) However, the electromagnetic relay according to the conventional example has a movable base 7
A pair of positioning protrusions 7a, 7a protruding laterally from both sides of the
In addition, the leaf springs 8 and 8 are fixed by thermal caulking and held in place, and the mounting direction and the moving direction are the same. Therefore, the fixing strength in the moving direction is low, and the leaf springs 8 and 8 are not movable.
Easy to peel off from.

Moreover, the leaf springs 8, 8 are easily lifted up during thermal crimping and are often thermally crimped without being in close contact with the movable table 7. Therefore, it is difficult to obtain a predetermined spring force and the operating characteristics are likely to vary.

Further, as shown in FIG. 14, when the movable block 6 moves in the direction of arrow m, the leaf spring 8 on the front side moves with the distance S ₁ from the one end 8a to the base of the positioning protrusion 7a as the fulcrum distance. However, when the movable block 6 is returned in the direction of the arrow n, the distance S ₂ from the one end 8a of the leaf spring 8 to the contact portion 8b that abuts on the corner of the movable base 7 moves as the inter-fulcrum distance. , The distance between fulcrums when moving back and forth is different. Therefore, the spring constant changes, and the spring force of the leaf spring 8 becomes unbalanced. The same applies to the other leaf springs 8. As a result, the movable block 6 does not move in parallel but moves in an inclined state, and the movable contact piece 6a hits one side to cause a time lag in the opening / closing operation of the contact, so that the operation characteristics of the electromagnetic relay are not good. There was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electromagnetic relay in which a leaf spring is less likely to be peeled off from a movable block and a uniform and good operating characteristic is obtained.

(Means for Solving the Problems) In order to solve the above-mentioned object, the present invention holds a movable block by a pair of opposed leaf springs integrated by a connecting body,
In an electromagnetic relay that opens and closes contacts by reciprocating the movable block in the pinching direction of the leaf spring based on excitation and demagnetization of an electromagnet block, the leaf spring located on an extension line of both side edge portions of the connecting body A tongue piece is provided in the vicinity of the lower end portion so as to project downward, and the tongue piece is engaged with an engagement hole provided in the movable block.

Further, the tongue piece is provided near the inside of the extension line of both side edge portions of the connecting body, and the lower end portion of the leaf spring located between the tongue piece and the extension line is bent outward to raise the claw portion. It may be provided.

Therefore, according to the present invention, the tongue projecting downward from the lower end of the leaf spring located on the extension line of the both side edges of the connecting body is inserted into the engaging hole of the movable block. Since they are engaged, the mounting direction and the moving direction are substantially orthogonal to each other.

Therefore, even if the movable block reciprocates in the direction in which the leaf spring is attached, the leaf spring is unlikely to separate from the movable block.

Moreover, in the present application, since the tongue piece of the leaf spring is engaged with the engaging hole of the movable table, the heat caulking work becomes unnecessary, and the variation in the operating characteristics due to the heat caulking defect is eliminated.

Further, since the tongue piece of the leaf spring is provided on the extension line of the both side edge portions of the connecting body, when the movable block reciprocates, the leaf spring bends from the extension line, so that the leaf spring is bent from the end portion of the leaf spring. The distance between the fulcrums to the base of the connecting body is constant, and the spring constant of the leaf spring does not change. Therefore, the spring force of the leaf spring does not change during operation and return, and the movable block reciprocates in parallel without tilting, so that good operating characteristics can be obtained.

Further, the tongue piece is provided not in the lower end portion of the leaf spring located on the extension line of both side edge portions of the connecting body but in the vicinity of the inner side of the extension line, and the claw portion is provided between the extension line and the tongue piece. Since the lower end portion of the leaf spring located at is bent and bent outward, the claw portion has a function of a rib and restricts elastic deformation of the leaf spring in the plate thickness direction. Therefore, even if the tongue piece is near the inside of the extension line, the leaf spring bends around the extension line, so that the distance between the fulcrums does not change even when the movable block reciprocates. As a result, similar to the above, the distance between the fulcrums of the leaf spring becomes constant and the spring constant does not change, so that there is an effect that the movable block moves in parallel without tilting and good operating characteristics are obtained.

(Embodiment) An embodiment according to the present invention will be described below with reference to the accompanying drawings of FIGS. 1 to 15.

This embodiment is applied to a high-frequency relay, and is roughly composed of a base 10, a shield mechanism section 20, an electromagnet block 30, a movable block 40, a support spring 50, and a case 60.

The base 10 is a resin molded product having a shallow rectangular box shape, and has a plurality of terminal holes 11 along the long side direction at both corners of the bottom surface.
Is provided (the terminal hole on the front side in FIG. 1 is not shown), and the contact terminals 12a, 12b, 12c and 13a, 13b, 13c are press-fitted into the terminal hole 11, respectively. Furthermore, a press-fitting groove 14 having an opening is provided on one side wall on the short side, and locking recesses 15a and 15b continuous with the press-fitting groove 14 are provided. A support plate 16 for supporting a support spring 50 described later is provided in the press-fitting groove 14.
Is press-fitted and fixed. A pair of pillars 17a and 17b are provided on the other side wall corner portion on the short side so as to project upward. The support columns 17a, 17b are provided with holding grooves 18a, 18b for holding a support spring 50 described later, respectively. In addition, 10a is a gas vent hole.

The shield mechanism section 20 includes a shield case 21 and a ground terminal 25.

As shown in FIG. 7, the shield case 21 has the terminal hole 22, the cutout portion 23 and the fitting hole 24 punched out and the projection 21b.
The pair of opposed shield walls 21a, 21a is formed by bending and bending the protruding metal plate by a bending line indicated by a dotted line by press working. According to this embodiment, there is an advantage that the shield case 21 can be formed by a single bending process.

The ground terminal 25 is formed by press working and has a plurality of continuous terminal portions 26.
After being punched out and integrally formed, it is bent.

Then, the fitting protrusion 27 of the ground terminal 25 is caulked and integrated with the terminal hole 22 of the shield case 21, and then the terminal portion 26 is formed into a plurality of terminal holes provided at the bottom corner of the base 10.
The contact terminals 12a, 12b, 12c are press-fitted into 19 (the terminal hole on the front side in FIG. 1 is not shown), so that the contact terminals 12a, 12b, 12c are formed into the cutout 23, the fitting hole 24, and the cutout of the shield case 21. It projects from 23 respectively. Therefore, the contact terminals 12a, 12b, 12c are positioned between the pair of opposing shield walls 21a, 21a,
Magnetically shielded (Fig. 8). Contact terminals 13a, 13b, 13c
The same is true for.

It is needless to say that all the contact terminals and the shield case 21 are not in contact with each other and are insulated.

Further, the shield case 21 is not limited to the one described above, but may be one provided with a connecting portion 21c as shown in FIGS. 9 and 10, for example. According to this embodiment, the mechanical strength of the shield case 21 is improved and the dimensional accuracy of the parts is high.

According to this embodiment, since the base 10 is shielded by the shield case 21 formed by bending a metal plate,
For example, it is easier to obtain high dimensional accuracy than when forming a shield layer by performing Cu-Ni plating on the inner surface of the base 10,
There is an advantage that the cost can be reduced.

The electromagnet block 30 is formed by winding two sets of coils 33, 33 around a body 32 of a spool 31 having flanges 31a, 31b at both ends, and pedestals 34a, 34b extending from the flanges 31a, 31b, respectively. The terminal holes 35a and 35b are provided in the
Coil terminals 36a and 36b are press-fitted into a and 35b, respectively.
The lead wires of the two sets of coils 33, 33 are
The coil terminals 36a and 36b of the set are respectively tangled and soldered. Further, in the spool 31, the iron core 37 is inserted into the square hole 32a provided in the body portion 32, and the protruding one end portion is the magnetic pole portion 37a while the protruding other end portion 37b is bent and bent backward of the yoke 38. When the holes 38b provided in the piece 38a are fixed by caulking and integrated, the magnetic pole portion 37a bends and bends the yoke 38 forward.
It is located between c and 38d. If necessary, the magnetic pole portion 3
The magnetic shields 37c and 37d may be attached and integrated on the attraction surface of 7a.

The electromagnet block 30 is provided with a protrusion 39 (the protrusion on the rear side is not shown in FIG. 1) protruding downward from the lower surfaces of the pedestals 34a and 34b on the bottom surface of the base 10. They are fitted into the fitting holes 10b, respectively, and fixed by heat crimping, cold crimping, or the like.

The movable block 40 is formed by press-fitting a permanent magnet 44 held by a pair of movable iron pieces 42, 43 into a front frame portion 41a of a resin movable base 41 and fixing the permanent magnet 44 with an adhesive. 45a,
Insulating bases 48a, 48b and 48c, 48d are press-fitted into the 45b, 45c, 45d from the lower side and temporarily fixed. Support springs, which will be described later, are provided near the square holes 45a, 45b and 45c, 45d.
Engagement holes 47a, 47b, 47c, 47d for engaging the 50 are provided respectively (in FIG. 11, the engagement holes on the far side are not shown). And
The insulating bases 48a, 48b and 48c, 48d are movable contact pieces 49a, 49b.
The movable block 40 forms two parallel rows of movable contact pieces because the movable block 40 and the movable block 40 have 49c and 49d, respectively.

The support spring 50 is formed by bending and bending up two leaf springs 51 and 52 provided in parallel on both sides of the connecting body 53 so as to face each other (Fig. 11). Then, the leaf springs 51, 52 are bent at their rear end portions inwardly to form bent portions 51a, 52a, respectively, and cut off a boundary corner portion between the coupling body 53 and the leaf springs 51, 52 to seal the sealant. Injection holes 53a, 53b, 53 for injection
c and 53d are provided. Further, at the lower end portions of the leaf springs 51 and 52 located on the extension lines of the both side edges of the connecting body 53, the claw portions 55
a, 55b, 55c, 55d are formed by bending and raised, and the engaging holes 47a, 47b, 47c, 47 of the movable base 41 are provided at positions adjacent to the bent holes.
Engagement protrusions 54a, 54b, 54c, 54d that engage with d are respectively provided on the lower side (in FIG. 11, the engagement protrusions on the back side are not shown).

According to this embodiment, since the two leaf springs 51, 52 are integrated by the connecting body 53, the number of parts is reduced, the number of assembling steps is reduced, and the dimensional accuracy between the leaf springs 51, 52 is high. As a result, the assembling accuracy is improved, so that there is an advantage that variation in operating characteristics hardly occurs.

Then, after engaging and positioning the engaging protrusions 54a, 54b and 54c, 54d with the engaging holes 47a, 47b and 47c, 47d of the movable table 41, respectively, the square holes 45a to 45d from the injection holes 53a to 53d. When the sealant is injected into each of the
48a, 48b and 48d, 48e are fixed and square hole 45a
Since the sealant overflowing from the notches 46a to 46d of the to 45d and solidified fixes the leaf springs 51 and 52 to both side surfaces of the movable base 41, the movable block 40 and the support spring 50 are integrated.

Next, the movable block 40 is positioned and incorporated above the electromagnet block 30 fixed to the base 10, and the leaf spring 5
The ends 51e, 52e of the 1, 52 are fitted into the holding grooves 18b, 18a of the base 10, respectively, and are positioned with slight rattling, while the bent pieces 51a, 52a are provided at the other ends.
Are fixed to the back surface of the support plate 16 by spot welding or the like, so that the movable block 40 is supported so as to be capable of reciprocating in the directions of arrows m and n in FIG.

In the present embodiment, since the tongue pieces 54a to 54d are provided in the vicinity of the inside of the extension lines of the both side edge portions of the connecting body 53, the movable block 40
It is not necessary to provide the engaging holes 47a to 47d of the movable base 41 in the vicinity of the edge of the movable base 41, so that the movable base 41 can be easily molded and the movable base 41
Is not easily damaged.

Further, the leaf springs 51, 5 are attached to the support plate 16 press-fitted and fixed to the base 10.
Since the two bent pieces 51a and 52a are welded, there is an advantage that there is no rattling and the positioning accuracy is high.

Therefore, as shown in FIG. 5, the distance l ₁ between the bent corner portions 51c and 52c of the leaf springs 51 and 52 and the connecting body 53 of the leaf springs 51 and 52 are
And the distance l ₂ between the bases 51d and 52d becomes equal to
Distance from the bent corner portion 51c of the leaf spring 51 to the base portion 51d
Since l ₃ is equal to the distance l ₄ from the bent corner portion 52c of the leaf spring 52 to the base portion 52d, one side of the support spring 50 always forms a parallelogram.

Particularly, in the vicinity of the base portions 51d, 51f, 52d, 52f, claw portions 55a, 55b, 55c, 55d protruding laterally are respectively provided, and further, the tongue pieces 54a to 54d are engaged with the movable base 41. Since the movable blocks 40 reciprocate, the leaf springs 51, 52 are elastically deformed in the plate thickness direction because they are engaged with the holes 47a to 47d, respectively. 52 is hard to peel off. Therefore, the fulcrum when the movable block 40 reciprocates does not deviate from the bases 51d, 51f, 52d, 52f, and there is an advantage that the operation characteristics are stable.

The support spring 50 does not necessarily need to have the claw portions 55a to 55d, and may have a claw portion as shown in FIG.

Next, the case 60 is fitted to the base 10, the sealing agent 61 is injected into the bottom surface of the base 10 and solidified, and then the gas is released from the gas vent hole 10a to seal the assembly, thereby completing the assembly work.

By fitting the case 60, the end portions 51e and 52e of the leaf springs 51 and 52 do not float, which is advantageous in that the floating of the movable block 40 can be restricted.

Next, the operation of the electromagnetic relay according to this embodiment will be described.

At the time of non-excitation, the magnetic force of the permanent magnet 44 causes the movable iron piece 42 to be attracted to the magnetic pole portion 37a of the iron core 37, and the movable iron piece 43 to be attracted to the forward bending and raising piece 38c of the yoke 38 to form a magnetic circuit. It's closed. The movable contact pieces 49b and 49c are in contact with the contact terminals 12b, 12c and 13a, 13b, respectively.

When one of the two coils 33, 33 is excited so as to cancel the magnetic flux of the permanent magnet 44, the movable iron piece 4
While 2 and 43 repel the magnetic pole portion 37a of the iron core 37 and the front bending and raising piece 38c of the yoke 38, respectively, while being attracted to the front bending and raising piece 38d of the yoke 38 and the magnetic pole portion 37a of the iron core 37, respectively. The movable block 40 moves in the direction of arrow m in FIG.

Then, the movable contact pieces 49b and 49c are separated from the contact terminals 12b, 12c and 13a, 13b, while the movable contact pieces 49a and 49b are separated.
While d contacts the contact terminals 12a, 12b and 13b, 13c, respectively, the movable iron pieces 42, 43 are attracted to the forward bending and raising piece 38d of the yoke 38 and the magnetic pole portion 37a of the iron core 37 to close the magnetic circuit. .

At this time, the bent portions 51a, 5 of the leaf springs 51, 52 shown in FIG.
Since 2a is fixed to the support plate 16 and the end portions 51e and 52e are movably supported, the leaf springs 51 and 52 are in a cantilevered state, and the bent corner portions 51c and 52c and the base portions 51d and 52d.
Always forms a parallelogram, so movable block 40
Moves in parallel without tilting. Therefore, the movable contact piece
Since the contacts 49a, 49d contact the contact terminals 12a, 12b and 13b, 13c at the same time without hitting each other, the switching characteristics are good.

Next, when the one of the coils 33 is de-excited, the magnetic force of the permanent magnet 44 holds the state.

Further, when the other coil 33 is excited in the direction opposite to the above-mentioned excitation, the movable iron pieces 42, 43 perform the operation opposite to the above-mentioned operation, return in the direction of arrow n in FIG. 49d separates from the contact terminals 12a, 12b and 13b, 13c, and the movable contact pieces 49b and 49c contact the contact terminals 12b, 12c.
And 13a, 13b is contacted and it returns to the original state.

When the movable contact pieces 49a, 49b, 49c and 49d are not in contact with the contact terminals, respectively, or when returning, they contact the protrusions 21b of the shield cases 21 and 21 and are magnetically shielded.

Further, in the above-described embodiment, the case where the magnetic pole portion of the iron core serving as the driving source is one has been described, but the present invention is not limited to this, and the present invention is applied to an electromagnetic relay having two driving sources as shown in the conventional example. Of course, it is okay.

[Brief description of drawings]

1 to 12 show an embodiment of an electromagnetic relay according to the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a plan sectional view,
FIG. 3 is a front sectional view, FIG. 4 is a side sectional view, FIG. 5 is a front sectional view, FIG. 6 is a bottom view, and FIGS. 7 and 8 are schematic views showing a shield case development view and an assembled state. Plan views, FIGS. 9 and 10 are development views of a shield case according to another embodiment and schematic plan views showing an assembled state,
FIG. 11 is an exploded perspective view showing an assembled state of the support spring and the movable block, FIG. 12 is an exploded perspective view showing an assembled state of the support spring and the movable block according to another embodiment, and FIG.
FIG. 14 and FIG. 14 are an exploded perspective view and a plan sectional view of an electromagnetic relay according to a conventional example. 30 ... Electromagnetic block, 40 ... Movable block, 50 ... Support spring, 53 ... Connection body, 51, 52 ... Leaf spring, 54a to 54d ... Tongue piece, 55a
~ 55d ... claws.

Claims (2)

[Scope of utility model registration request] 1. A pair of opposed leaf springs integrated by a connecting body holds a movable block in a fixed manner to excite an electromagnet block.
Based on demagnetization, in the electromagnetic relay that opens and closes the contacts by reciprocating the movable block in the pinching direction of the leaf spring, in the vicinity of the lower end portion of the leaf spring located on an extension line of both side edge portions of the connecting body, An electromagnetic relay characterized in that a tongue piece is provided so as to project downward, and the tongue piece is engaged with an engagement hole provided in the movable block. 2. A tongue piece is provided near the inside of an extension line of both side edge portions of the connecting body, and a lower end portion of a leaf spring located between the tongue piece and the extension line is bent and bent outward. The electromagnetic relay according to claim 1, wherein a claw portion is provided.