JPH09259726A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay which is excellent in opening- closing performance of a contact point by arranging narrow parts whose width direction is locally narrowed close to the extendedly arranged root from movable springs, in support springs to impart restoring force to an armature. SOLUTION: An electromagnetic relay whose armature 3 can move since a central shaft 3c is swingably pivoted, is composed of a first extendedly arranged piece 5a extendedly arranged in the short direction of an armature 3 from movable springs 4 whose support springs 5 are arranged on both sides of the armature 3 and a second extendedly arranged piece 5b which is extendedly arranged from its tip and is supported with a support part 6e of a base 6 by welding. Narrow parts 5d whose width direction is locally narrowed closer to the extendedly arranged root from the first extendedly arranged piece 5a than a welding position 5c, are arranged in these support springs 5. When a second extendedly arranged piece 5b is supported with the support part 6e of the base 6 by welding, even if a spring warp is caused, the spring warp is absorbed by the narrow parts 5d. Therefore, the rotation moment is not applied to the armature 3 and an armature block 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called balanced armature type electromagnetic relay in which an armature is pivotally supported by a central shaft and is movable.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay of this type, FIG.
17 to 17 are available. This product has a U-shaped iron core A in which a coil B is wound so that the magnetic poles are A ₁ and A _{2 at} both ends, and a central axis C _{0 in the} longitudinal direction is swingably supported and both ends C ₁ and C ₂ are provided with armatures C that are attracted and released to the magnetic poles A ₁ and A ₂ at both ends of the iron core A, and movable contacts D ₁ and D ₂ are provided at both ends so that they are substantially parallel to the longitudinal direction of the armature C. A movable spring D whose central portion is integrally fixed to the armature C by a molded body D ₀
And a base E provided with fixed contacts E ₁ and E ₂ for contacting and separating the movable contacts D ₁ and D ₂ , and a first extension piece F extending from the movable spring D in the lateral direction of the armature C. ₁ and the first extending piece F second supported by the supporting portion E ₃ provided on the base E ₁ of the distal end portion by longitudinally is further extended welded armature C for extending piece F ₂ With a supporting spring F that gives the armature C a restoring force to the central axis when swinging, and the magnetic poles A ₁ and A ₂ at both ends of the iron core A are the same pole, and the armature C is the different pole. And a permanent magnet G that magnetizes.

Specifically, as shown in FIG. 14, the support spring F includes a second extension piece F ₂ extending from the tip of the first extension piece F ₁ in the longitudinal direction of the armature C. The dimension in the width direction is constant.

The permanent magnet G is formed in a substantially flat plate shape having a pivotal groove G ₀ having a semicircular concave cross section at the central position on one side, and both end portions G ₁ and G ₂ in the longitudinal direction are both formed. At the N pole, three points are magnetized so that the eccentric position toward the other end G ₂ side of the center becomes the S pole, and both ends G ₁ and G ₂ of the both end magnetic poles A ₁ and A ₂ of the iron core A. It is arranged so as to be located inside.

The armature C is provided with a pivotal ridge (not shown) having a semicircular convex cross section, which is provided at the central position.
To fit in G _0, are spot welded to the second extending piece F ₂ is welded position F ₃ of the supporting spring F on the support portion E ₃ of the base E, thereby, the movable spring D is the support portion E ₃ And is electrically connected to a common contact terminal that is led to the outside.

Next, the operation will be described. When energized the coil B in the specified direction, the armature C depending on the direction of magnetization at one end C ₁ is attracted to one magnetic pole portion A ₁ of the iron core A, permanently pivotally支条in on the central axis C ₀ The movable contact D ₁ which is pivotally supported by the pivot groove G ₀ of the magnet G and swings, and which is provided at one end of the movable spring D, that is, the normally open side (so-called NO side contact) contacts the fixed contact E ₁ . Contact.

When the coil B is de-energized, the permanent magnet
G is magnetized by shifting the center S pole of the three-point magnetization to a position eccentric to the other end G ₂ side, so that the holding and attracting force is at one end.
The other end G ₂ side is stronger than the G ₁ side, and the other end C _{2 of} the armature C is attracted to the other end magnetic pole part A ₂ of the iron core A and reciprocally swings. The movable contact D ₂ which is a normally closed side so-called NC side contact provided at the end contacts the fixed contact E ₂ and returns to the original state.

As described above, this electromagnetic relay has the coil B
, The armature C is swingably movable about the central axis C ₀ so that the NC side contact always comes into contact with the contact point.
It is a so-called monostable balanced amateur type,
In response to the armature C, the movable contact provided on the movable spring D contacts and separates from the fixed contact as described above. Armature like this
When C oscillates, a torsional stress is generated in the support spring F ₁ about the projecting piece F ₁ , and the spring force is applied to the armature C ₁ as a restoring force to the central axis C ₀ . Then, the spring forces of the movable spring D and the support spring F act as a spring load on the armature C.

[0009]

In the above-described conventional electromagnetic relay, the support spring F has the second extension piece F ₂ spot-welded on the support portion E _{3 of the} base E. , A spring warp S occurs around the welded welded portion F ₃ .
Then, as shown in Fig. 17, the spring load L is added excessively so that it does not pass through the center of the stroke of the armature C, and the armature block H consisting of the armature C and its periphery is shown in Fig. 16 There is a possibility that the rotational moment as indicated by the arrow will be applied, and the opening and closing performance of the contacts will be hindered.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic relay having a good contact opening / closing performance.

[0011]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, an iron core around which a coil is wound so that both ends thereof are magnetic poles and a central axis in the longitudinal direction oscillate. Armatures that are rotatably supported and both ends are attracted and released to both magnetic poles of the iron core, and movable contacts are provided at both ends, and the central part is integrated with the armature so as to run substantially parallel to the longitudinal direction of the armature. Fixedly fixed movable spring, a base provided with a fixed contact for moving the movable contact to and away from the movable spring, and an armature that swings by being supported by a support portion extended from the movable spring and provided on the base by welding. In the electromagnetic relay provided with a support spring that applies a restoring force to the central axis, the support spring has a width direction closer to the extension root from the movable spring than the welded portion welded to the support portion. It is configured to have a narrow portion that is locally narrow.

According to a second aspect of the present invention, in the first aspect, the narrow portion is formed as a residual portion provided on both sides in the width direction by a hole provided in the support spring. It is configured.

According to a third aspect of the present invention, in the first aspect, the narrow portion is formed as a residual portion provided in the width direction by a cut provided in the support spring. I am doing it.

According to a fourth aspect, in the third aspect, the notches are alternately provided from both sides of the support spring in the width direction.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes an iron core, which is made of a magnetic material and is formed into a substantially U-shape with both end leg portions as magnetic pole portions 1a and 1b, and a coil 1c is wound via a coil bobbin.

Reference numeral 2 is a permanent magnet, which is formed in a substantially flat plate shape having a groove-shaped pivotally supporting portion 2a having a semicircular cross section at a central position on one surface side, and has both longitudinal end portions 2b, 2c. Both are N poles, and three points are magnetized so that the position eccentric to the other end 2c of the center becomes the S pole, and both ends 2b, 2c are located inside the magnetic poles 1a, 1b on both ends of the iron core 1, respectively. Are arranged.

Reference numeral 3 denotes an armature, which is made of a magnetic material and is formed in a substantially rectangular flat plate shape so that both end portions 3a, 3b in the longitudinal direction can face both end magnetic pole portions 1a, 1b of the iron core 1, and one side In the central part of the, a pivotal ridge (not shown) having a semicircular cross section that can be fitted to the pivotal part 2a of the permanent magnet 2 is provided with its semicircular center aligned with the central axis 3c in the longitudinal direction. ing.

Reference numeral 4 denotes a movable spring, which is formed of a thin leaf spring material such as a copper alloy in a long shape, and has a movable contact 4a at its tip.
However, the movable contacts 4b are fixed to the other end of the armature 3, and the center part partially cut out in the width direction on each side of the armature 3 in the width direction is the center part on the other side of the armature 3. It is fixedly supported by an integrally formed insulator 4c that covers and is provided side by side substantially parallel to the longitudinal direction of the armature 3.

Reference numeral 5 denotes a support spring, which includes a first extension piece 5a extending in the lateral direction of the armature 3 from a movable spring 4 provided on both sides of the armature 3 and a first extension piece 5a thereof. The second extension piece 5b further extends from the tip of the installation piece 5a and is supported by welding on a support portion 6e of the base 6 described later.
This support spring 5 is closer to the extension root from the first extension piece 5a than the welding position 5c to be spot-welded to the support portion 6e of the base 6, that is, to the second extension root from the movable spring 4. A narrow portion 5d that locally narrows the width direction is provided. Specifically, the narrow portion 5d is provided with cuts 5e alternately provided from both sides in the width direction of the support spring 4, and is formed as a residual portion provided in the width direction by the cuts 5e.

Reference numeral 6 denotes a base, which is made of a resin material and is formed in a rectangular box shape with one side opened. Fixed contacts 6a are provided at two corners at one end side in the longitudinal direction of the one side, and two corners at the other end side. Each fixed contact 6b is provided on the
fixed terminal piece 6c connected to a, 6b, coil terminal piece 6d connected to the coil 1c, the support portion 6e provided in the concave portion at the center of both sides in the longitudinal direction on one side, and the common terminal piece 6f connected to it,
The conductive plates are integrally formed.

Then, on one side of the base 6, the coil 1c is connected to the coil terminal piece 6e and the iron core 1 is mounted, and the permanent magnet 2 is placed inside both magnetic pole portions 1a and 1b of the iron core 1. Both ends
2b and 2c are respectively located and arranged. Next armature
The second extension piece 5b of the support spring 5 provided on each side of the armature 3 is such that the pivot strip provided at the center fits into the pivot groove 2a of the permanent magnet 2. The welding position 5c on the central axis 3c of the armature 3 is spot-welded on the support portion 6c of the base 6 to form the welding portion 5f at the welding position 5c.

In this way, the movable spring 4 is electrically connected to the common terminal piece 6f led out from the supporting portion 6e, and the armature 3 is pivotally supported on the permanent magnet 2 so that its central portion can swing. Both ends 3a and 3b in the longitudinal direction are magnetic poles at both ends of the iron core 1.
They are arranged facing each other so as to be suction-released to 1a and 1b, respectively. Then, the box-shaped case 7 is fitted on one side of the base 6.

Next, the operation will be described. When the coil 1c is energized in the specified direction, one end 3a of the armature 3 is attracted to the one magnetic pole part 1a of the iron core 1 according to the direction of its magnetization, and the pivotal support on the central shaft 3c of the permanent magnet 2 The movable contact 4a pivotally supported by the pivot groove 2c swings, and the movable contact 4a, which is a normally open side (so-called NO side) contact provided at one end of the movable spring 4, contacts the fixed contact 6a.

When the coil 1c is de-energized, the permanent magnet
2 is magnetized by shifting the center S pole of the three-point magnetization to the position eccentric to the other end 2b side, so that the holding attraction force is
The other end 2c side is stronger than the 2b side, and the other end 3b of the armature 3 is attracted to the other end magnetic pole part 1b of the iron core 1 and reciprocally swings, and is provided at the other end of the movable spring 4. Also, the movable contact 4b, which is a normally closed side so-called NC side contact, comes into contact with the fixed contact 6b and returns to the original state.

As described above, this electromagnetic relay has the coil 1c.
The armature 3 is swingably movable with the central shaft 3c as a fulcrum so that the NC side contact always comes into contact when the power is turned off.
It is a so-called monostable balanced amateur type,
In response to the armature 3, the movable contact provided on the movable spring 4 contacts and separates from the fixed contact as described above.

Then, the movable spring 4 and the support spring 5
Fig. 4 shows the spring load of the armature 3 acting as a spring load on the armature 3. The horizontal axis is the stroke of the armature 3 and the vertical axis is the spring load acting on the armature 3. is there. The spring load L is the sum of the spring forces of the movable spring 4 and the support spring 5 described above.

In such an electromagnetic relay, the support spring 5
Even if a spring warp occurs when the second extension piece 5b is supported by the support portion 6e of the base 6 by welding, the narrow portion 5d absorbs the spring warp. Since the spring warpage of the entire spring is reduced, as shown in FIG. 4, the spring load L is not excessively applied unlike the conventional example, and the armature block 10 composed of the armature 3 and its peripheral portion is eliminated. It is possible to improve the opening and closing performance of the contacts because the rotational moment is not applied.

Further, the support spring 5 is provided with the notch 5e, so that the narrow portion 5d is relatively easily formed as the remaining portion thereof.

Further, the support spring 5 is provided with the cuts 5d alternately from both sides in the width direction thereof, so that the spring property of one end portion in the width direction is not lowered, and the spring property is not biased. I'm getting better.

Further, through the notch 5e, the supporting portion of the base 6 is
It is possible to confirm the welding state between 6e and the welded portion 5f of the support spring 5.

In the present embodiment, the cuts 5e are provided alternately from both sides of the support spring 5 in the width direction. For example, since the spring property is relatively strong, there is no problem even if it is slightly biased. In such a case, the support spring 5 may be provided from only one side in the width direction, and in that case, the support spring 5 can be processed more easily.

Next, a second embodiment of the present invention will be described below with reference to FIGS. The members having substantially the same functions as those of the first embodiment are denoted by the same reference numerals,
Only different points from the first embodiment will be described. In the first embodiment, the narrow portion 5d is formed as the remaining portion of the second extending piece 5b by providing the notch 5d, while in the present embodiment, the second extending portion 5b is formed. The piece 5b is provided with a hole 5g and is formed as the remaining portion.

In this electromagnetic relay, as in the first embodiment, the support spring 5 has a spring warp when the second extending piece 5b is supported by the supporting portion 6e of the base 6 by welding. Even if occurs, the narrow portion 5d absorbs the spring warp, so that the contact opening / closing performance can be improved.

Further, the support spring 5 is provided with the hole 5g, so that the narrow portion 5d is formed as a residual portion provided on both sides of the second extending piece 5b in the width direction. Does not drop so much, so that the spring load can be adjusted by twisting, so-called twist adjustment.

Further, the support portion 6e of the base 6 is passed through the hole 5g.
It is possible to confirm the welding state between the welded portion 5f of the support spring 5 and the support spring 5.

Next, a third embodiment of the present invention will be described with reference to FIGS.
13 will be described below. Members having substantially the same functions as those in the second embodiment are designated by the same reference numerals,
Only different points from the second embodiment will be described. In the second embodiment, the pivot 2a of the permanent magnet 2 is formed in the shape of a concave groove having a semicircular cross section, and the armature 3 has a semicircular convex shape in which the pivot 2a of the permanent magnet 2 can be fitted. On the other hand, in the present embodiment, the pivotal support portion 2a of the permanent magnet 2 is formed in the shape of a hole with rounded chamfers at the opening edge, and has an armature.
3 has a configuration in which a pivotal protrusion 3d having a semicircular convex cross section that can be fitted into the pivotal portion 2a of the permanent magnet 2 is formed.

In such an electromagnetic relay, the armature 3
Is pivotally supported in a state where the pivotal projection 3d having a semicircular convex cross section is fitted into the hole-shaped pivotal support 2a of the permanent magnet 2, so that not only in the longitudinal direction of the permanent magnet 2, Positioning in the short-side direction is also performed, and it is swingably supported in a more stable state, so that the contact opening / closing performance can be further improved as compared with the second embodiment.

In each of the first to third embodiments, the support spring 5 is composed of the first and second extension pieces 5a and 5b, but it may be composed of only one extension piece. The same effect can be achieved.

[0040]

According to the first aspect of the present invention, in the support spring, even if the spring warp occurs when the extended piece is supported by the support portion of the base by welding, the spring has a narrow portion. Since the warp is absorbed, the spring warp of the entire support spring is reduced, and the contact opening / closing performance can be improved.

According to a second aspect of the invention, in addition to the effect of the first aspect, the support spring is narrowed as a residual portion provided on both sides in the width direction of the extending piece by providing a hole. Since the portion is formed, the spring property does not deteriorate so much, so that it is possible to adjust the spring load by twisting, so-called twist adjustment.

According to the third aspect, in addition to the effect of the first aspect, the support spring can relatively easily form the narrow portion as the remaining portion by providing the notch. .

According to the fourth aspect, in addition to the effect of the third aspect, the support spring is provided with cuts alternately from both sides in the width direction thereof, so that the spring property of one end portion in the width direction is improved. It is not necessary to drop only the spring, and it is not necessary to bias the springiness.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a partial plan view of the same support spring.

FIG. 3 is a partial front view showing a welded state of the above support spring.

FIG. 4 is an explanatory diagram of a spring load of the above.

FIG. 5 is a perspective view showing an armature and its periphery according to a second embodiment of the present invention.

FIG. 6 is a partial plan view of the same support spring.

FIG. 7 is a perspective view showing a permanent magnet of a third embodiment of the present invention.

FIG. 8 is a plan view of the above permanent magnet.

FIG. 9 is a front sectional view of the above permanent magnet.

FIG. 10 is a side sectional view of the above permanent magnet.

FIG. 11 is a plan sectional view of the same.

FIG. 12 is a sectional view taken along line XX of FIG. 11;

FIG. 13 is a sectional view taken along line YY of FIG. 11;

FIG. 14 is an exploded perspective view showing a conventional example.

FIG. 15 is a partial plan view of the above support spring.

FIG. 16 is a partial front view showing a welded state of the above support spring.

FIG. 17 is an explanatory diagram of a spring load of the above.

[Explanation of symbols]

 1 Iron core 1a One end magnetic pole part 1b Other end magnetic pole part 1c Coil 3 Armature 3a One end part 3b Other end part 3c Central shaft 4 Moving spring 4a Moving contact (NO side) 4b Moving contact (NC side) 6 Base 6a Fixed contact ( NO side) 6b Fixed contact (NC side) 6c Support part 5 Support spring 5d Narrow part 5e Cut 5f Weld part 5g Hole

Claims (4)

[Claims] 1. An iron core on which a coil is wound so that both ends thereof are magnetic poles, and a central axis in the longitudinal direction is swingably supported, and both ends are respectively suction-released to both end magnetic poles of the iron core. A base provided with an armature, a movable contact at both ends, a movable spring integrally fixed to the armature at the center so as to extend substantially parallel to the longitudinal direction of the armature, and a fixed contact at which the movable contact comes in contact with and separates from the armature. And a supporting spring that extends from the movable spring and is supported by a supporting portion provided on the base by welding to give a restoring force to the central axis to the armature when swinging, and an electromagnetic relay comprising: The support spring includes a narrow portion that locally narrows a width direction closer to an extension root from the movable spring than a welded portion welded to the support portion is provided. . 2. The electromagnetic relay according to claim 1, wherein the narrow portion is formed as a residual portion provided on both sides in the width direction by a hole provided in the support spring. 3. The electromagnetic relay according to claim 1, wherein the narrow portion is formed as a residual portion provided in the width direction by a notch provided in the support spring. 4. The electromagnetic relay according to claim 3, wherein the cuts are provided alternately from both sides in the width direction of the support spring.