JP2007200618A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silent electromagnetic relay capable of suppressing shock and sound generated by it when an operation piece returns while having a simple structure. <P>SOLUTION: In the electromagnetic relay 1 including a coil bobbin 11, a switch-on coil 12 wound around the coil bobbin 11, an iron core 13 penetrating through the coil bobbin 11 in such a manner that its upper end projects from the coil bobbin 11, and an operation piece 14 rotatably supported by a hinge spring 15 and electromagnetically attracted to the upper end of the iron core 13 to rotate by providing a current to the switch-on coil 12, a spring member 16 is provided above the tip side of the operation piece 14 to buffer the return rotation action of the operation piece 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a silent electromagnetic relay capable of suppressing an impact during a return rotation operation of an operating piece and a sound generated thereby.

  Conventionally, in an electromagnetic relay that opens and closes an electric circuit, when an energizing coil is energized, the operating piece is attracted to the iron core and rotates, and when the energization is released, the operating piece returns to its original position. The collision noise caused by the collision with the yoke is a problem due to the rotation of the operating piece, and various techniques have been proposed to reduce this. Patent Document 1 discloses a silent electromagnetic relay (electromagnetic relay) that reduces noise generated during operation and recovery.

3A and 3B are explanatory diagrams of the silent electromagnetic relay disclosed in Patent Document 1. FIG. 3A is a side view of the electromagnetic relay, and FIG. 3B is a partially enlarged perspective view of the electromagnetic relay.
The electromagnetic relay 100 includes a movable iron piece 300 that is rotatably supported by an electromagnet block 200 via a support spring 400, and a contact mechanism 500 that is driven by the movable iron piece 300. In FIG. 3B, an operation buffer spring 420 and a return buffer spring 430 extend as shown in FIG. 3B, with a hinge spring 410 extending from the center of the upper edge of the 400. Is provided.
According to the electromagnetic electromagnet relay 100, when the electromagnet block 200 is de-energized and the movable iron piece 300 returns, the movable iron piece 300 contacts the return buffer spring portion 430, so that the impact energy is absorbed and relaxed. In addition, the lower end portion 310 of the movable iron piece 300 does not collide with the side surface of the yoke 600, and the sound generated at the time of return can be reduced.
JP 2002-245917 A

  However, if such a return-time buffer spring portion 430 and an operation-time buffer spring portion 420 are formed integrally with the hinge spring portion 410, the shape thereof becomes complicated, so that it is easily deformed and damaged, and the movable iron piece 300 is rotated. There is a possibility that the strength for supporting the movement freely cannot be maintained. In addition, forming the support spring 400 having such a complicated shape has problems in that it is expensive to manufacture, has a low yield, and cannot be easily attached.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a silent electromagnetic relay capable of suppressing an impact at the time of return of an operating piece and a sound caused by the operation piece while having a simple structure. It is said.

In order to achieve the above object, an electromagnetic relay according to a first aspect of the present invention includes a coil bobbin, an energizing coil wound around the coil bobbin, an iron core penetrating with the upper end protruding from the coil bobbin, and a hinge spring. An actuating piece that is movably supported and that rotates by being magnetically attracted to the upper end of the iron core by energizing the energizing coil, and above the actuating piece, A spring member is provided for buffering the return rotation operation.
The return rotation operation of the working piece here refers to a turning operation in which, after being magnetically attracted to the iron core, the energization of the energization coil is released and the operation piece returns to the original position.

  The electromagnetic relay according to a second aspect of the present invention is the electromagnetic relay according to the first aspect, wherein the spring member is configured in a plate shape formed so as to straddle the upper side of the operating piece, and protrudes toward the operating piece side at a central portion thereof. A tongue piece formed by cutting and raising is provided.

  According to the electromagnetic relay of claim 1, since the spring member for buffering the return rotation operation of the operation piece is provided above the front side of the operation piece, the return rotation operation of the operation piece. In this case, the speed at which the operating piece collides with the yoke can be reduced. Therefore, although the structure is simple, after the energization of the energizing coil is released, the impact on the actuating piece and the collision sound caused by the collision with the yoke that occur when the actuating piece performs the return rotation operation can be suppressed. it can.

  According to the electromagnetic relay of the second aspect, since the spring member is composed of a plate material provided so as to straddle the operating piece, it can be easily attached. Further, since a tongue piece is formed in the central portion of the spring member so as to protrude and cut and protrude toward the working piece side, the tongue piece comes into contact with the tip side of the working piece and is added at the time of return. Since the impact on the operating piece is reduced, and the structure of the spring member is simple, there is no concern about an increase in cost.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

1A and 1B are explanatory views showing the structure of a silent electromagnetic relay according to the present invention, in which FIG. 1A is a plan view and FIG. 1B is a front view including a partial cross section taken along line A-A in FIG. 1A and 1B show a case where the energization of the energizing coil 12 is released and the electric circuit is in an open state.
The electromagnetic relay 1 includes components described below, is configured on an insulating base 24, and is formed as a unit body that is entirely covered with a cover case (not shown).
As shown in FIG. 1, the electromagnetic relay 1 includes an electromagnet 10, an operation piece 14 that is rotatably supported by a hinge spring 15, and that is rotated by being attracted to the electromagnet 10 by energizing the electromagnet 10. A yoke 17 fixed on the side surface of the electromagnet 10, a card 18, a control contact 19 including a movable contact 19a and a fixed contact 19b, a movable spring 20 for erecting the movable contact 19a, A fixed terminal 21, a movable terminal 22, and a coil terminal 23 are provided. Reference numeral 25 denotes a pedestal formed integrally with the insulating base 24.
The electromagnet 10 includes a coil bobbin 11 having flanges 11 a at both ends, an energizing coil 12 wound around the coil bobbin 11, and an iron core 13 penetrating through the center of the energizing coil 12. The iron core 13 has one end portion as a magnetic pole portion and a base end portion of a substantially L-shaped yoke 17 fixed to the other end portion.

The yoke 17 is made of a magnetic material, and the base end portion is fixed to the other end portion of the iron core 13, while the vertical portion is configured to rotatably support the operating piece 14. The yoke 17 serves as a magnetic path for magnetic flux generated when the energizing coil 12 is excited.
In the operating piece 14, a pressing portion 14 b that applies a pressing force to the control contact 19 and an adsorption portion 14 a that is adsorbed to the iron core 13 are bent in a substantially L shape, and the inner corner portion 14 c is perpendicular to the yoke 17. In a state where it is in contact with the tip of the part, it is urged by a hinge spring 15 protruding upward from the opening part opened in the bent part, so that it is supported rotatably, and the adsorbing part 14 a is one end part of the iron core 13. Opposite to. Here, the hinge spring 15 is installed with its lower end embedded in a recess 15a formed in the base 25 and the insulating base 24, and the operating piece 14 is attached with a spring in a direction away from the adsorption surface. It is a leaf spring.

The control contact 19 includes a fixed contact 19b provided on a fixed terminal 21 made of a non-magnetic material such as copper and having a good conductivity, and a movable terminal 22 made of the same material as the fixed terminal 21. It is comprised with the movable contact 19a provided on the top. As the material of the fixed contact 19b and the movable contact 19a, a material having a low electrical resistance, a high melting point, and a good heat resistance can be used, such as Ag / Cu, AgCdO / Cu, AgNi / Cu, or AgSnO2 / Cu alloy. .
The control contact 19 is configured such that the movable contact 20 a comes into contact with the fixed contact 19 b when the movable spring 20 is pressed by the protrusion 18 a formed on the card 18.

In the electromagnetic relay 1 configured as described above, when the energizing coil 12 is energized, the suction portion 14a of the operating piece 14 is attracted to the iron core 13, and the pressing portion 14b of the operating piece 14 rotates in conjunction with this, The card 18 moves to the fixed contact 19b side by the pressing portion 14b. Then, the movable contact 19a is pressed by the protrusion 18a formed on the card 18 to come into contact with the fixed contact 19b, and the electric circuit is closed.
When the energization of the energization coil 12 is released, the adsorption of the adsorption portion 14a is released, and the operating piece 14, the card 18, and the movable spring 20 are returned to their original positions (return rotation operation). 19a is separated from the fixed contact 19b, and the electric circuit is opened.

Above the operating piece 14, a spring member 16 is fixedly attached to buffer the return rotation operation of the operating piece 14 described above.
FIG. 2A is a partial perspective view showing the configuration of the main part of the electromagnetic relay of the present invention, and FIG. 2B is a perspective view of a spring plate used in the present invention.
The spring member 16 is formed in a plate shape so as to straddle the adsorption portion 14a of the operating piece 14, and when the front side 14d of the operating piece 14 is separated from the iron core 13, as shown in FIG. It installs in the range which contacts. At the center of the spring member 16, a tongue piece 16 a is formed that protrudes and is raised to the working piece 14 side so that the front side 14 d of the working piece 14 contacts. On the way until the operating piece 14 completely returns to the return position, the tongue piece 16a comes into contact with the front side 14a of the operating piece 14 and thereby elastically reacts to release the energization to the energizing coil 12. After that, the impact on the working piece 14 caused by the return rotation operation of the working piece 14 can be suppressed, and the speed at which the working piece 14 collides with the yoke 17 can be reduced, so that the collision sound due to this collision can be suppressed.

  Although not shown here, the spring member 16 may be provided on the side of the cover case that is configured on the insulating base 24 of the electromagnetic relay 1 and covers the entirety thereof. Needless to say, the configuration of the electromagnetic relay according to the present invention, the shape of the components such as the operating piece, and the like are not limited to those shown in the drawings.

It is explanatory drawing which showed the structure of the electromagnetic relay of this invention, (a) is a top view, (b) is a front view including the partial cross section of the (A) figure AA line. (A) is the fragmentary perspective view which showed the principal part structure of the electromagnetic relay of this invention, (b) is the perspective view of a spring member. (A) is the front view which showed the conventional shock absorption type electromagnetic relay, (b) is the principal part expansion perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 10 Electromagnet block 11 Coil bobbin 11a Ridge part 12 Current supply coil 13 Iron core 14 Actuation piece 14a Adsorption part 14b Press part 15 Hinge spring 15a Support part 16 Spring member 16a Tongue piece 17 Relay 18 Card 19 Contact 19a Movable contact 19b Fixed contact 20 Movable spring

Claims (2)

A coil bobbin, an energizing coil wound around the coil bobbin, an iron core penetrating through the coil bobbin with its upper end protruding, and a hinge spring rotatably supported by energizing the energizing coil to the upper end of the iron core An electromagnetic relay including an actuating piece that rotates by being magnetically attracted;
An electromagnetic relay characterized in that a spring member for buffering a return rotation operation of the operating piece is provided above the operating piece. In claim 1,
The spring member is configured in a plate shape formed so as to straddle above the operating piece, and a tongue piece that protrudes and is formed to protrude from the operating piece side is provided at the center of the spring member. Characteristic electromagnetic relay.

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