JPH10255634A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay minimized in contact bounce to extend the life. SOLUTION: A movable contact plate 10 is lengthy formed from a conduct material, and a wide part 11 having a larger cross dimension than the other part of the movable contact plate 10 is formed on one end part thereof. A movable contact 1 arranged opposite to a fixed contact is formed on the wide part 11, and holes 12, 12 for inserting shaft parts 44, 44 protruded on a card 4 are bored on both sides of the movable contact 1. The card 4 is engaged with the movable contact plate 10 in the state where the shaft parts 44 are inserted to the holes 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay.

[0002]

2. Description of the Related Art As this type of electromagnetic relay, as shown in FIG. 6, a flexible movable member having a base 6, a cover 7 attached to the upper surface of the base 6, and a movable contact 1 is provided. A contact plate 10, a fixed contact plate 20 provided with a fixed contact 2 opposed to the movable contact 1, and a combination in which the movable contact plate 10 is bent toward the fixed contact plate 20 to bring the movable contact 1 into contact with the fixed contact 2. Some include a card 4 made of resin and an electromagnet block 5 for driving the card 4. Both contact plates 10 and 20 are each formed in a long shape from a conductive material, and are provided at both ends respectively. The contacts 1 and 2 are implanted substantially parallel to one end of the base 6 so as to face each other with a predetermined distance (contact gap) therebetween.

The electromagnet block 5 includes a coil bobbin 51 having a core made of a magnetic material inserted at the center, a coil 52 wound around the coil bobbin 51, and a magnetic path covering the lower surface and one side surface of the coil 52. An L-shaped yoke 53,
It comprises a hinge spring 55 caulked to the yoke 53 and a substantially L-shaped armature 54 made of a magnetic material. The armature 54 is connected to the yoke 5 by a hinge spring 55.
3 is rotatably held around the upper end.

[0006] As shown in FIGS. 6 and 8 (a) and 8 (b), the card 4 has a projection 42 projecting from one end of a substrate 41, and the other end of the substrate 41 is forked. Engagement protrusions 43 protrude from both ends of the end. 6 and 7
As shown in FIG. 1, one end 10a of the movable contact plate 10 is fixed to the base 6, and the movable contact 1 is provided at the other end 10b. Engaging recesses 15 are provided on both sides in a portion of the movable contact plate 10 between the one end 10a and the movable contact 1,
The engagement projection 43 of the card 4 is engaged with the engagement recess 15. The engaging recess 15 is formed by cutting out both ends along the longitudinal direction of the strip-shaped movable contact plate 10, and the upper and lower ends of the notch 16 are folded sideways to form folded pieces 17, 17. When the engaging projection 43 is engaged with the engaging recess 15, the folded pieces 17 are brought into contact with the upper and lower surfaces of the engaging projection 43.

The protrusion 42 formed at one end of the card 4 is inserted into a hole (not shown) provided at one end piece 54 a of the armature 54, and is formed at the other end of the card 4. The mating projection 43 engages with the engaging concave portion 15 provided on the movable contact plate 10, and the card 4 connects the movable contact plate 10 with the armature
Is supported so as to be able to move back and forth. Here, when the coil 52 is energized, the armature 54 is attracted to the core and rotates counterclockwise in FIG. 6 around the upper end of the yoke 53.
The end piece 54a of the armature 54 presses the card 4 rightward in FIG. At this time, the card 4 presses the movable contact plate 10 toward the fixed contact plate 20, and the movable contact 1 comes into contact with the fixed contact 2.

[0006]

In the electromagnetic relay having the above-mentioned structure, as shown in FIG. 6, the card 4 presses a portion between the one end 10a and the other end 10b of the movable contact plate 10. Since the portion of the movable contact plate 10 provided with the movable contact 1 can move freely, the contact bounce of the movable contact 1 increases when the contacts 1 and 2 come into contact with each other. As a result, there is a problem that a trouble such as contact welding occurs due to the occurrence of an arc, and the contact life is shortened.

Further, since the engagement concave portion 15 of the movable contact plate 10 which engages with the engagement convex portion 43 of the card 4 merely bends the upper and lower ends of the notch 16 of the movable contact plate 10, the thickness of the card 4 is reduced. However, since the width of the engaging recess 15 is large, the gap between the card 4 and the folded piece 17 becomes large, and the operation of the card 4 becomes unstable. Further, in order to reduce the contact bounce, as shown in FIG. 9, there is a case where an engagement recess 15 is provided in a portion of the movable contact plate 10 closer to the end 1 b than a portion where the movable contact 1 is formed. In this case, the movable contact 1 is
Therefore, there is a problem that the stroke of the movable contact 1 driven by the card 4 is shortened (the contact gap between the two contacts 1 and 2 is narrowed) because it is located closer to the fulcrum than the engagement concave portion 15 pressed by the card 4. .

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 having a reduced contact bounce and a longer life. .

[0009]

According to a first aspect of the present invention, there is provided a movable contact plate provided with a movable contact opposed to a fixed contact, and a card for opening and closing both contacts. Engaged portions are provided on both sides of a portion of the movable contact plate where the movable contact is formed, and an engagement portion for engaging with the engaged portion is provided on the card. Therefore, since the engaged portions that engage with the engaging portions provided on the card are provided on both sides of the movable contact, the movement of the portion of the movable contact plate provided with the movable contacts causes the engagement with the engaging portion. The contact bounce is restricted by engagement with the portion, and the contact bounce can be reduced. Further, since the card drives the portion of the movable contact plate on which the movable contact is formed, the stroke amount of the movable contact can be made substantially equal to the drive amount of the card. Further, by engaging the engaging portion and the engaged portion, the play between the card and the movable contact plate can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the width of the portion of the movable contact plate where the engaged portion is formed is wider than the width of the other portion of the movable contact plate. Therefore, the engaged portion can be easily formed, and the area of the movable contact plate around the movable contact increases, so that the heat generated at the contact can be easily released. According to a third aspect of the present invention, in the first aspect of the present invention, since a slit hole is formed in a portion of the movable contact plate between the movable contact and the engaged portion, heat generated in the movable contact is affected. It can be difficult to tell the joint.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the width of the portion of the movable contact plate where the engaged portion is formed is within the width of the other portion of the movable contact plate. Since the portion of the movable contact plate where the engaged portion is formed is bent in the width direction of the movable contact plate, the width of the movable contact plate can be reduced.

[0012]

Embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIGS. 1 and 2 show an electromagnetic relay of this embodiment.
It will be described based on. Since the configuration of the electromagnetic relay other than the card 4 and the movable contact plate 10 is the same as that of the above-described conventional electromagnetic relay, illustration and description of the same parts are omitted.

As shown in FIGS. 1 (a) and 1 (b), the movable contact plate 10 is formed in a long shape from a conductive material, and one end 10a is fixed to the base 6. The other end portion 10b of the movable contact plate 10 is provided with a wide portion 11 wider than other portions, and the movable contact plate 10 is formed in a substantially T-shape. In the width direction of the movable contact plate 10, holes 1 serving as engaged portions are provided on both sides of the movable contact 1.
2, 12 are drilled. On the other hand, FIGS.
As shown in the figure, the card 4 is
Bifurcated engaging projections 43, 43 project from the side end, and each of the engaging projections 43, 43 has a hole 1 at its tip.
Shafts 44, 44 are provided as engaging portions to be inserted into the movable contact plates 1, 2.
The card 4 and the movable contact plate 10 are engaged with each other by being inserted into the holes 12, 12.

The wide portion 11 provided with the movable contact 1 is provided with a card 4 by engaging the hole 12 with the shaft 44.
, The contact bounce of the movable contact 1 is reduced, and even in the case of a load with a large rush current, the occurrence of arc can be prevented and the life of the contact can be extended. Further, since the gap between the hole 12 and the shaft portion 44 is small, the play between the card 4 and the movable contact plate 10 is reduced, and the operation of the card 4 and the movable contact plate 10 is stabilized.

Further, since the holes 12 are provided on both sides of the movable contact 1, the end 10 serving as a fulcrum of the movable contact plate 10 is provided.
a from the end 10a to the hole 12
The distance to is almost equal. Therefore, the stroke of the movable contact 1 becomes substantially the same as the drive amount of the card 4, and the stroke of the movable contact 1 can be increased.
A predetermined contact gap between the fixed contact 2 and the fixed contact 2 can be secured.

Further, since the wide portion 11 is formed wider than other portions of the movable contact plate 10, the holes 12, 12 are easily formed. Further, the area of the movable contact plate 10 around the movable contact 1 can be increased, and the heat generated by the movable contact 1 can be easily radiated.
This prevents the synthetic resin card 4 inserted into the hole 12 from being melted due to the heat generated.

Incidentally, in the electromagnetic relay of the present embodiment, as shown in FIG. 3, a portion of the movable contact plate 10 between the movable contact 1 and the holes 12, 12 extends along the longitudinal direction of the movable contact plate 10. Running slit holes 13, 13 may be formed. By forming the slit hole 13, the movable contact 1
Is less likely to be transmitted to the hole 12, and the synthetic resin card 4 inserted into the hole 12 can be prevented from melting. In addition, since the rigidity of the portion of the movable contact plate 10 where the slit hole 13 is formed is reduced and is easily bent, the movable contact plate 10 is bent according to the contact angle between the movable contact 1 and the fixed contact 2, and , 2 can be reliably contacted. (Embodiment 2) FIGS. 4 and 5 show the electromagnetic relay of this embodiment.
It will be described based on. The movable contact plate 10 of the electromagnetic relay
Other configurations are the same as those of the above-described conventional or the electromagnetic relay according to the first embodiment, and illustration and description of the same portions will be omitted.

As shown in FIGS. 4A to 4C, the movable contact plate 10 is formed in an elongated shape from a conductive material.
One end 10 a is fixed to the base 6. Movable contact plate 10
A wide portion 11 wider than other portions is formed at the other end portion 10b of the movable member 1 and the movable contact 1 is formed at the wide portion 11. Both ends in the width direction of the wide portion 11 are folded twice substantially perpendicularly to a side opposite to the surface on which the movable contact 1 is provided, and the flange portion 1 is formed.
4, 14 are formed, and holes 12,
12 are respectively formed.

The holes 1 formed in the flanges 14
The shafts 44, 44 of the card 4 are inserted into the cards 2, 12, so that the card 4 and the movable contact plate 10 are engaged. in this way,
Since the flange portion 14 in which the hole 12 is formed is folded back in the width direction of the movable contact plate 10, the width dimension of the movable contact plate 10 can be reduced as compared with the first embodiment, and the movable contact plate 10 can be downsized. .

[0020]

According to the first aspect of the present invention, as described above, a movable contact plate provided with a movable contact opposed to a fixed contact and a card for opening and closing the contact are formed, and the movable contact of the movable contact plate is formed. Engaged portions are provided on both sides of the engaged portion, and engagement portions for engaging with the engaged portions are provided on the card. Therefore, by providing the engaged portion to be engaged with the engaging portion provided on the card on both sides of the movable contact, the movement of the portion of the movable contact plate provided with the movable contact can be controlled by the engagement portion and the engaged portion. And the contact bounce can be reduced, so that even in the case of a load with a large inrush current, it is possible to prevent the occurrence of arc at the contact and extend the life of the contact. This has the effect. In addition, since the card drives the portion of the movable contact plate on which the movable contact is formed, the stroke amount of the movable contact can be made substantially equal to the drive amount of the card, and the effect that the contact gap between both contacts can be sufficiently secured can be obtained. is there. Further, by engaging the engaging portion and the engaged portion, the play between the card and the movable contact plate can be reduced, and there is an effect that the operation of the card can be prevented from becoming unstable.

According to the second aspect of the present invention, the width of the portion of the movable contact plate where the engaged portion is formed is wider than the width of the other portion of the movable contact plate. It can be easily formed. In addition, since the area of the movable contact plate around the movable contact is increased, heat generated at the contact is easily released, and there is an effect that the engaging portion of the card engaged with the engaged portion can be prevented from melting. .

According to the third aspect of the present invention, since the slit hole is formed in the portion of the movable contact plate between the movable contact and the engaged portion, heat generated at the movable contact is transmitted to the engaged portion. As in the second aspect of the invention, there is an effect that the engaging portion of the card engaged with the engaged portion can be prevented from melting. According to a fourth aspect of the present invention, the engaged portion of the movable contact plate is formed such that the width of the portion of the movable contact plate where the engaged portion is formed is within the width of the other portion of the movable contact plate. The bent portion is bent in the width direction of the movable contact plate, so that the width dimension of the movable contact plate can be shortened, and the size of the contact can be reduced.

[Brief description of the drawings]

FIG. 1 shows a movable contact plate of an electromagnetic relay according to a first embodiment,
(A) is a perspective view, (b) is a principal part enlarged view.

FIGS. 2 (a), (b) and (c) are explanatory views showing an engaged state of a movable contact plate and a card in the above.

FIG. 3 is an enlarged view of a main part showing another movable contact plate of the above.

FIG. 4 shows a movable contact plate of the electromagnetic relay according to the second embodiment,
(A) is a perspective view, (b) is an enlarged view of a main part, and (c) is a top view.

FIGS. 5A and 5B are explanatory views showing an engaged state of the movable contact plate and the card in the same.

FIG. 6 is a sectional view showing a conventional electromagnetic relay.

FIG. 7 is a perspective view showing a movable contact plate of the above electromagnetic relay.

FIGS. 8A and 8B are explanatory views showing an engaged state of the movable contact plate and the card in the same.

FIG. 9 is an enlarged view of a main part for explaining another movable contact plate of the electromagnetic relay of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable contact 2 Fixed contact 4 Card 10 Movable contact plate 10b End part 11 Wide part 12 Hole 44 Shaft part

Claims (4)

[Claims] A movable contact plate provided with a movable contact facing the fixed contact; and a card for opening and closing the two contacts. Engaged portions are formed on both sides of a portion of the movable contact plate where the movable contact is formed. An electromagnetic relay, wherein the card is provided with an engaging portion for engaging with the engaged portion. 2. The electromagnetic relay according to claim 1, wherein the width of the portion of the movable contact plate where the engaged portion is formed is wider than the width of the other portion of the movable contact plate. . 3. A slit according to claim 1, wherein a slit is formed at a portion of the movable contact plate between the movable contact and the engaged portion.
Electromagnetic relay as described. 4. The engaged portion of the movable contact plate is formed such that the width of the portion of the movable contact plate where the engaged portion is formed is within the width of the other portion of the movable contact plate. The electromagnetic relay according to claim 1, wherein the portion is bent in a width direction of the movable contact plate.