JPH09320439A - Electromagnetic relay - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an electromagnetic relay that can prevent a chattering phenomenon at the time of operation and at the time of restoration and has high productivity. SOLUTION: A card 40 is provided with a second pressing protrusion 42 that comes into contact with a portion of the back surface of a movable contact piece 51 located near the movable contact 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay,
The present invention relates to a structure for regulating the position of a movable contact piece by the card.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay, for example, as shown in FIG.
Based on the excitation and demagnetization of the movable iron piece 3, the substantially iron-shaped movable iron piece 3 is rotated, and the horizontal tip of the card 4 provided at the lower end of the movable iron piece 3 presses and releases the intermediate portion of the back surface of the movable contact piece 5. As a result, the movable contact 5a provided on the upper end of the movable contact piece 5 may be brought into contact with or separated from the fixed contact 6a of the fixed contact piece 6 erected on the base 1. Then, in order to prevent so-called chattering that occurs when the movable contact 5a is separated from the fixed contact 6a at the time of returning, in order to prevent so-called chattering, the position regulating projection 8 is provided on the ceiling surface of the case 7 fitted to the base 1.
Is provided, and the upper edge of the movable contact piece 5 is brought into contact with the protrusion 8 to regulate the position.

[0003]

However, in the above-mentioned position regulation structure, it is possible to prevent chattering at the time of returning, and it is necessary to assemble the case 7 to the base 1 in a state where the movable contact piece 5 cannot be seen. For this reason, when fitting the case 7 to the base 1, the projection 8 is easily locked to the tip of the movable contact piece 5, and the movable contact piece 5 may be plastically deformed, which requires time and effort for assembly. . In particular, as the electromagnetic relay becomes smaller, the distance between the movable contact 5a and the fixed contact 6a becomes smaller.
As a result, chattering during operation and return is more likely to occur, and assembly is troublesome,
There is a problem that productivity decreases.

In view of the above problems, it is an object of an electromagnetic relay according to the present invention to provide a highly productive electromagnetic relay which can prevent chattering during both operation and restoration.

[0005]

In order to achieve the above-mentioned object, an electromagnetic relay according to the present invention drives a card with a movable iron piece that rotates based on the excitation and demagnetization of an electromagnet block. In the electromagnetic relay in which the movable contact is brought into contact with and separated from the fixed contact by pressing and releasing the back surface of the movable contact piece with the pressing protrusion, in the card, on the back surface of the movable contact piece, near the periphery of the movable contact. The second pressing protrusion that comes into contact with is provided.

Further, the card may be provided with a pair of second pressing protrusions which come into contact with both sides of the movable contact on the back surface of the movable contact piece.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS. As shown in FIGS. 1 to 5, the electromagnetic relay according to the first embodiment rotates a card 40 via a movable iron piece 30 that rotates based on the excitation and demagnetization of an electromagnet block 20 erected on a base 10. The card 40 drives the contact mechanism 50 provided on the base 10.

The base 10 has an insulating wall 1 at the center of its upper surface.
1 is provided in a protruding manner. Then, the support bodies 12 and 12 extend upward from both side edge portions of the upper end surface of the insulating wall 11,
The support body 12 is provided with an engagement hole 13. Further, a pair of engagement receiving portions 14 and 15 (the rear side engagement receiving portion 14 is not shown) are formed on the base portion of the insulating wall 11 so as to rotatably support a card 40 described later. The engagement receiving portion 14 on the back side is notched so that a card 40 described later can be inserted from the side.

Further, a movable contact piece 51 and a fixed contact piece 52 are press-fitted from the side into the base 10 to form a contact mechanism 50, and a movable contact 53 faces a fixed contact 54 so as to be contactable and separable. . Reference numeral 55 is a lead terminal of the fixed contact piece 52.

The electromagnet block 20 has a collar portion 21,
A coil 24 is wound around a spool 23 having 22 and a lead wire of the coil 24 is entwined with a entangled portion 25a of a coil terminal 25 press-fitted into the collar portion 21 and soldered. Then, the iron core 26 having a substantially T-shaped cross section is inserted into the center hole of the spool 23 (FIG. 2), and the protruding upper end portion is the magnetic pole portion 26a.
On the other hand, the protruding lower end portion 26b is caulked and fixed to the horizontal portion of the substantially L-shaped yoke 27.

Further, a movable iron piece 30 is rotatably supported on one edge of the upper end surface of the yoke 27 via a hinge spring 31 assembled to the collar portion 21 of the spool 23.

Then, by positioning the electromagnet block 20 above the base 10 and pushing it down, the projections 27a provided on the upper end portions of both side surfaces of the yoke 27 are inserted into the engaging holes 13 of the support body 12. By engaging, the electromagnet block 20 is prevented from coming off from the base 10. For convenience of description, the coil 24 and the hinge spring 31 are not shown in FIG.

As shown in FIGS. 3 and 4, the card 40 has first and second pressing protrusions 41 and 42 projecting laterally on one surface thereof, and a third pressing protrusion 43 on the opposite surface thereof. And a pivot shaft 44 fitted to the engagement receiving portions 14 and 15 of the base 10 is provided at the lower end thereof. Further, the tip surfaces of the first pressing protrusion 41 and the third pressing protrusion 43 of the card 40 located at the same height form a part of an arc 45, as shown in FIG. Further, in the vicinity of the rotating shaft 44, a projection 46 that reduces the frictional force generated during the rotation is provided. And the card 40
The second pressing protrusion 42 has a planar shape shown in FIG. 5A, but is not necessarily limited to this and, for example, FIG.
It may have a planar shape shown in (b) and (c), or may be a card 40 having a pair of second pressing protrusions 42, 42 (FIG. 5 (d)).

The card 40 is laterally inserted between the insulating wall 11 and the movable contact piece 51, and one end of the rotary shaft 44 thereof is sequentially inserted into the engagement receiving portions 14 and 15, whereby
The card 40 is rotatably supported by the base 10.

Further, by fitting a box-shaped case (not shown) to the base 10 from above, the pivot shaft 44 of the card 40 is prevented from coming off and the assembling work is completed.

Next, the operation of the electromagnetic relay having the above construction will be described. That is, when the electromagnet block 20 is non-excited, the card 4 is moved by the spring force of the movable contact piece 51.
0 presses the vertical lower end of the movable iron piece 30, the horizontal tip of the movable iron piece 30 is separated from the magnetic pole portion 26a of the iron core 26, and the movable contact 53 is separated from the fixed contact 54.

When a voltage is applied to the coil 24 of the electromagnet block 20 for excitation, the magnetic pole portion 2 of the iron core 26 is excited.
6a sucks the horizontal tip of the movable iron piece 30. Therefore, against the spring force of the movable contact piece 51, the movable iron piece 30 rotates about one side edge of the upper end surface of the yoke 27 as a fulcrum, and the vertical lower end portion of the movable iron piece 30 moves to the third pressing protrusion of the card 40. Press 43. As a result, the card 40 rotates about the rotation shaft 44, and the first pressing protrusion 41 presses the intermediate portion on the back surface of the movable contact piece 51. Therefore, after the movable contact piece 51 rotates and the movable contact 53 comes into contact with the fixed contact 54, the second pressing protrusion 42 presses the back surface of the movable contact piece 51 to prevent the chattering phenomenon. The horizontal tip portion of the iron piece 30 is attracted to the magnetic pole portion 26a of the iron core 26.

When the excitation of the electromagnet block 20 is released,
Due to the spring force of the movable contact piece 51, the movable contact 53 is separated from the fixed contact 54, the card 40 is rotated in the opposite direction to the above, and the movable iron piece 30 is rotated in the opposite direction to return to the original state. To do.

According to the present embodiment, the second pressing protrusion 42 abuts on the back surface of the movable contact piece 51 near the movable contact 53, so that the chattering phenomenon at the time of operation and at the time of returning can be prevented.

In the second embodiment, as shown in FIG. 6, the card 40 is provided on the upper end portion of the movable contact piece 51 in the first embodiment.
While the second pressing protrusion 42 of the card contacts the movable contact 53 to prevent chattering, the card 4
This is a case where the pair of second pressing protrusions 42, 0 of 0 are brought into contact with each other to prevent the chattering phenomenon. As the plane shape of the card 40 used in this embodiment, for example, the second pressing protrusions 42, 42 having the plane shape shown in FIG. 5D are used. According to the present embodiment, since the position of the back surface of the movable contact piece 51 is regulated at three points, there is an advantage that the chattering phenomenon can be prevented more effectively. The other parts are the same as those of the first embodiment, and the description is omitted.

In the third embodiment, as shown in FIG. 7, the second pressing protrusion 42 of the card 40 is brought into contact with the back surface of the movable contact piece 51 in the vicinity of the lower side of the movable contact 53.
This is a case of preventing the chattering phenomenon. The other parts are the same as those of the first embodiment, and the description is omitted.

In the above-described embodiment, the card 40 has the rotating shaft 44, but the card 40 does not necessarily have the rotating shaft and may be attached to one end of the movable iron piece. .

[0023]

As is apparent from the above description, according to the first aspect of the present invention, the card is provided with the second pressing protrusion which comes into contact with the vicinity of the movable contact on the back surface of the movable contact piece. There is. Therefore, even if the movable contact piece vibrates due to the inertial force of the movable contact at the time of opening / closing the contact, the second pressing protrusion of the card regulates the vibration of the movable contact piece to prevent the chattering phenomenon during the operation and the return. To do. Further, the position is regulated by the second pressing protrusion of the card located on the back side of the movable contact piece. Therefore, unlike the conventional example, it is not necessary to provide the position regulating projection on the ceiling surface of the case fitted to the base. As a result, the case is easier to assemble than the conventional example,
A highly productive electromagnetic relay can be obtained. According to the second aspect of the present invention, the card is provided with the pair of second pressing protrusions that come into contact with both sides of the movable contact on the back surface of the movable contact piece. Therefore, even if the movable contact piece vibrates due to the inertial force of the movable contact at the time of opening and closing the contact, the pair of second pressing protrusions of the card regulate the position of the movable contact piece at three points. The chattering phenomenon can be prevented more effectively.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of an electromagnetic relay according to the present invention.

2 is a schematic front view of the first embodiment shown in FIG. 1. FIG.

3 shows the card shown in FIG. 1, FIG. 3 (a) is a perspective view seen from the outside, and FIG. 3 (b) is a perspective view seen from the inside.

4A and 4B show the card shown in FIG. 1, where FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a right side view.

5 is a plan view of the upper end of the card, FIG.
The upper end plan view of the card shown in FIG.
(C), (d) is a top plan view showing another application example.

FIG. 6 is a schematic front view showing a second embodiment of an electromagnetic relay according to the present invention.

FIG. 7 is a schematic front view showing a third embodiment of an electromagnetic relay according to the present invention.

FIG. 8 is a front sectional view of an electromagnetic relay according to a conventional example.

[Explanation of symbols]

10 ... Base, 11 ... Insulating wall, 12 ... Supporting body, 13 ... Engagement hole, 20 ... Electromagnet block, 30 ... Movable iron piece, 40 ...
Cards 41, 42, 43 ... First, second and third pressing protrusions, 44 ... Rotating shaft, 51 ... Movable contact piece, 52 ... Fixed contact piece, 53 ... Movable contact, 54 ... Fixed contact.

Claims (2)

[Claims] 1. A movable iron piece that rotates based on the excitation and demagnetization of an electromagnet block drives the card, and the first pressing protrusion of this card presses and releases the back surface of the movable contact piece to move the card. An electromagnetic relay in which a contact is brought into contact with and separated from a fixed contact, wherein the card is provided with a second pressing protrusion that comes into contact with the vicinity of the periphery of the movable contact on the back surface of the movable contact piece. 2. A movable iron piece that rotates based on the excitation and demagnetization of an electromagnet block drives the card, and the first pressing protrusion of this card presses and releases the back surface of the movable contact piece to move the card. In an electromagnetic relay for contacting and separating a contact with a fixed contact, the card is provided with a pair of second pressing protrusions that abut on both sides of the movable contact on the back surface of the movable contact piece. relay.