JPH1145648A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount an elastic body to a contact spring or a contact terminal plate without adhesion by holding the elastic body between the contact spring and the contact terminal plate to push the elastic body against a base at a step provided on the contact spring. SOLUTION: A switching mechanism 18 has a contact terminal plate 16 provided on a body 11, a contact spring 15 provided 011 the body 11 for switching operation by the contact or separation of the contact terminal plate 16, an elastic body 19 held between the contact spring 15 and the contact terminal plate 16 to relax noise generated when the contact spring 15 collides with the contact terminal plate 16 and a step provided on the contact spring 15 to push the elastic body 19 against the body 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement of an electromagnetic relay.

[0002]

2. Description of the Related Art As an electromagnetic relay, for example, Japanese Utility Model Laid-Open No. 1-1
Japanese Patent No. 40737, “Electromagnetic relay” is known. The following figure shows an electromagnetic relay similar to this electromagnetic relay.

FIG. 7 is a sectional view of a conventional electromagnetic relay.
A conventional electromagnetic relay 100 includes a resin body 101,
An electromagnet 102 attached to the body 101 and an armature 103 attached to one end of the electromagnet 102 so as to be able to swing.
A hinge spring 104 for pressing the armature 103 against one end of the electromagnet 102, a driving piece 105 that moves at the other end of the armature 103, a switch mechanism 106 that is closed by the pushing action of the driving piece 105, and a body 101. And a case 107 attached to the main body.

The electromagnet 102 includes a coil 112 wound around a bobbin 111, an iron core 113 attached to the bobbin 111 so as to penetrate the coil 112, a yoke 114 connecting one end of the iron core 113, and a lower part of the bobbin. And a shock-absorbing spring 115 attached to the The switch mechanism 106 includes the driving piece 1
The contact spring 117 is moved by the pressing action of the contact spring 05, and a contact terminal plate 118 that performs a switching operation by contacting the contact spring 117.

When a predetermined voltage is applied to the electromagnet 102,
One end of the armature 103 is drawn to the iron core 113 of the electromagnet 102 as shown by an arrow. Since the armature 103 is mounted so as to be able to swing, the other end of the armature 103 moves as shown by the arrow to move the driving piece 105 linearly. Contact spring 1
17 is moved by the pushing action of the driving piece 105 to move the contact terminal plate 1.
18 and performs a switch operation. On the other hand, the armature 10
One end of 3 starts to hit the buffer spring 115 and receives a force in the direction opposite to the arrow while being drawn to the iron core 113 of the electromagnet 102 as shown by the arrow. Therefore, the impact sound when one end of the armature 103 collides with the iron core 113 is reduced.

[0006]

However, in the conventional electromagnetic relay 100, although the effect of reducing the impact when one end of the armature 103 collides with the iron core 113 is exerted, the contact spring 117 of the switch mechanism 106 has the contact. Terminal board 11
The effect of suppressing the impact sound when colliding with No. 8 was not sufficient. Also, it is difficult to mount the buffer spring 115, and there is also a problem that the spring pressure of the buffer spring 115 varies greatly and the amount of absorption of shock varies.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay having a simple structure, capable of suppressing noise, and having high reliability.

[0008]

In order to achieve the above object, a first aspect of the present invention is to apply a valley portion of a substantially L-shaped armature to a fulcrum provided on a yoke of an electromagnet and direct the armature toward the fulcrum. And push it with a hinge spring so that one end of the armature faces the iron core of the electromagnet.
With the other end of the armature facing the switch mechanism provided on the base base, the armature is swung by the attraction of the iron core, and the switch mechanism is pressed by the armature to push the switch mechanism. And a contact spring provided on the base for switching by contacting or isolating the contact terminal plate, and a noise generated when the contact spring collides with the contact terminal plate. For this purpose, an elastic body is interposed between the contact spring and the contact terminal plate, and a step is provided on the contact spring to press the elastic body toward the base.

An elastic body for damping the sound generated when the contact spring collides with the contact terminal plate is sandwiched between the contact spring and the contact terminal plate. I was able to press. The elastic body is sandwiched between the contact spring and the contact terminal plate, and the elastic body is pressed against the base by the step provided in the contact spring, so that the elastic body is attached to the contact spring or the contact terminal plate without bonding or the like. be able to.

According to a second aspect of the present invention, the distance between the armature and the iron core is plotted on the horizontal axis, and the attractive force of the electromagnet is plotted on the vertical axis, and a hyperbolic attractive force characteristic curve is drawn on the graph. When the spring load characteristic line is drawn on the graph with the vertical axis as the vertical axis, the spring load characteristic line when the elastic body is interposed between the contact spring and the contact terminal plate is the suction force before the elastic body is interposed. An electromagnetic relay characterized by being within the range of a characteristic curve.

Since the straight line of the spring load characteristic when the elastic body is interposed is within the range of the characteristic curve of the attraction force before the elastic body is interposed, the operating voltage of the electromagnetic relay increases even when the elastic body is interposed. I will not let you. Since the straight line of the spring load characteristic when the elastic body is interposed is within the range of the attraction force characteristic curve before the elastic body is interposed, the noise suppression measures of the electromagnetic relay within the range of the impressed voltage set before the elastic body is interposed. Can be applied.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is an exploded perspective view of an electromagnetic relay according to the present invention. The electromagnetic relay 1 includes a cover 2 and a relay block 10. The relay block 10 is covered with the cover 2. Cover 2 is a relay block 1
Covering 0 from above protects the components that make up the relay block 10 and also serves as a stopper to prevent the removal of these components.

FIG. 2 is an exploded perspective view of the relay block of the electromagnetic relay according to the present invention. The relay block 10 includes a hinge spring 12 and a body 11 serving as a base.
, The driving piece 13 is inserted into the body 11 from the lateral direction, the armature 14 is placed on the body 11, the contact spring 15 is pressed into the body 11 from the lateral direction, and the contact terminal plate 16 is inserted into the body 11 from the lateral direction. And the electromagnet 17 is press-fitted into the body 11 from the lateral direction. FIG. 1 shows the assembled state. The switch mechanism 18 includes a contact spring 15 and a contact terminal plate 16 with which the contact spring 15 contacts.
An elastic body 19 for absorbing an impact sound is provided between the contact spring 15 and the contact terminal plate 16. 19a is an elastic body 1
9 is a cushion portion, 19b is a stopper portion of the elastic body 19,
Reference numeral 19c denotes a support for the elastic body 19.

The body 11 has a lateral groove (not shown) for press-fitting the hinge spring 12, a lateral groove 11b, 11c for inserting the driving piece 13, a lateral groove 11d for press-fitting the contact spring 15, and a contact terminal. Transverse groove 1 for press-fitting plate 16
1e, a lateral groove 11f for press-fitting the electromagnet 17, a projection 11g for holding the electromagnet 17, a contact spring 15,
Side wall 11 for receiving contact terminal plate 16 and elastic body 19
h, and a lower surface 11 i supporting the contact spring 15, the contact terminal plate 16 and the elastic body 19.

The hinge spring 12 includes a press-fit portion 12a for press-fitting the body 11, and an action portion 12b extending laterally from the press-fit portion 12a and bent into an L-shape. Drive piece 13
Is a slide portion 13a having a planar shape as viewed in the drawing, and a stopper portion 13b projecting vertically from the center of the slide portion 13a.
Consists of The armature 14 has one end 14 a for facing one end of the electromagnet 17, the other end 14 b for facing the drive piece 13 bent from the one end 14 a into an L shape, and one end 14 a of these. And a valley 14c which is a boundary with the other end 14b.

The contact spring 15 includes a press-fit portion 15a for press-fitting the body 11, a terminal portion 15b extending downward from the press-fit portion 15a, a step 15c extending upward from the press-fit portion 15a, and a step portion 15c from the press-fit portion 15c. And a contact portion 15d extending further upward. The contact terminal plate 16 is connected to the body 1
1 includes a press-fitting portion 16a, a terminal portion 16b extending downward from the press-fitting portion 16a, and a contact portion 16c extending upward from the press-fitting portion 16a.

FIG. 3 is an exploded perspective view of the electromagnet of the electromagnetic relay according to the present invention. The electromagnet 17 includes an exciting coil 21,
An iron core 22 penetrates the center of the exciting coil 21 and a yoke 23 connected to one end of the iron core 22. The excitation coil 21 includes a bobbin 25 and a winding 26 wound around the bobbin 25. The bobbin 25 is connected to pin terminals 25a and 25a.
a and a recess 25 b for holding the yoke 23.

The iron core 22 comprises a cylindrical body 22a and an adsorbing portion 22b for adsorbing the armature 14 (see FIG. 2) provided at one end of the body 22a. The yoke 23 includes a flange 23b having a fitting hole 23a and a flange 2b.
The holding portion 23c is bent from 3a into an L shape and extends vertically, and the holding portion 23c has a fulcrum 23d.

FIG. 4 is a sectional view of an electromagnetic relay according to the present invention. This shows that the support portion 19c of the elastic body 19 is interposed between the contact spring 15 and the contact terminal plate 16 in the horizontal direction of the drawing. The vertical direction in the drawing shows that the stopper 19 b of the elastic body 19 is pressed against the lower surface 11 i of the body 11 by the step 15 c provided on the contact spring 15. In the drawing front and back direction, the back side of the drawing shows that the elastic body 19 is received by the side wall 11h of the body 11, and the drawing front side shows that it is covered with the case 2. Therefore, the elastic body 19 is fixedly supported without being bonded. The contact spring 1 of the switch mechanism 18
5 and the contact terminal plate 16 are separated, indicating that the electromagnetic relay 1 is open. In addition, as an example of the elastic body 19, there is a soft urethane foam which is a foam material, and for example, a product name SM-55 manufactured by INOAC CORPORATION is good.

The operation of the above-described electromagnetic relay 1 will now be described. FIG. 5 is an assembly process diagram of the electromagnetic relay according to the present invention, and shows an assembly procedure of the switch mechanism 18 of the electromagnetic relay 1. Note that ST01 to ST04 indicate respective step numbers. ST01: The body 11 is prepared. ST02: The contact terminal plate 16 is set on the body 11. ST03: The contact spring 15 is set on the body 11. ST04: The elastic body 19 is sandwiched between the contact spring 15 and the contact terminal plate 16, and the elastic body 19 is pressed against the lower surface 11i of the body 11 by the step 15c provided on the contact spring 15.

An elastic body 19 is sandwiched between the contact spring 15 and the contact terminal plate 16, and a step portion 15 provided on the contact spring 15 is provided.
Since the elastic body 19 is pressed against the lower surface 11i of the body 11 by c, the elastic body 19 can be attached to the contact spring 15 or the contact terminal plate 16 without bonding or the like. Therefore,
The assembly of the electromagnetic relay 1 becomes extremely easy, and the reliability of the electromagnetic relay 1 is improved without the risk of the elastic body 19 being peeled off and falling off, for example, when the elastic body 19 is bonded.

FIG. 6 is a diagram for explaining the operation of the electromagnetic relay according to the present invention. The horizontal axis represents the stroke S, and the vertical axis represents the spring load or the attraction force of the electromagnet. The attraction force characteristic curve P represents the relationship between the attraction force of the electromagnet 17 and the stroke S when a constant voltage is applied to the excitation coil 21 (see FIG. 2). The contact spring 15 of the mechanism 18 and the spring load of the elastic body 19, and a stroke S (hereinafter abbreviated as “stroke S”) until one end 14 a of the armature 14 moves to the suction portion 22 b of the iron core 22. It shows the relationship. (A) to (d) show the relationship between the open / closed state of the switch mechanism 18 and the stroke S at each point, and the relationship between the elastic body 19 and the stroke S. In the graph, R1 to R3 are spring load characteristics corresponding to the stroke S1 to S3 sections. In addition, the electromagnetic relay 1
In order for (see FIG. 1) to operate without any trouble, the spring load characteristic R needs to be within the range of the suction force characteristic P.

FIG. 3A shows the state of the switch mechanism 18, the stroke S, and the elastic body 19 before applying a voltage to the electromagnet 17. The switch mechanism 18 is open, the stroke S is S1 + S2 + S3, and the cushion portion 1 of the elastic body 19
9a does not contact the contact portion 15d of the contact spring 15. (B), a voltage is applied to the electromagnet 17 and the contact portion 15 d of the contact spring 15 is
a, and indicates that the stroke S has become S2 + S3. (C) shows that the contact spring 15 has contacted the contact terminal plate 16 and the stroke S has become S3.
9 shows that the cushion portion 19 a receives the contact spring 15 and softens the sound generated when the contact spring 15 collides with the contact terminal plate 16. (D), the armature 14 is the iron core 2
2 to indicate that the ON operation of the switch mechanism 18 has been completed.

Next, the spring load characteristics R1 to R3 in the sections of the strokes S1 to S3 will be described with reference to a graph. The spring load characteristic R1 in the section of the stroke S1 is the contact spring 1
5 is a load characteristic, which is a straight line with a gentle slope. The spring load characteristic R2 in the stroke S2 section is determined by the contact spring 1
5 is obtained by adding the load characteristics of the elastic body 19 to the load characteristics of No. 5, and the inclination is slightly increased. The spring load characteristic R3 in the section of the stroke S3 is obtained by adding the resistance of the contact terminal plate 16 to the sum of the load characteristic of the contact spring 15 and the load characteristic of the elastic body 19, and is a straight line having a steep inclination. When there is no elastic body 19, the load characteristic is as shown by a broken line.

Since the straight line R of the spring load characteristic when the elastic body 19 is interposed is within the range of the attractive force characteristic curve P before the elastic body 19 is interposed, the sensing voltage of the sensing voltage set before the elastic body 19 is interposed is set. Noise suppression measures can be taken without increasing the operating voltage of the electromagnetic relay 1 (see FIG. 1) within the range.

[0026]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, the elastic body is sandwiched between the contact spring and the contact terminal plate, and the elastic body is pressed against the base by the step provided in the contact spring, so that the contact spring or the contact terminal plate is not bonded. The elastic body can be attached to the. Therefore, assembling of the electromagnetic relay becomes extremely easy, and there is no possibility that the elastic body is peeled off and falls off, and the reliability of the electromagnetic relay is improved.

According to a second aspect of the present invention, the distance between the armature and the iron core is plotted on the horizontal axis, and the attractive force of the electromagnet is plotted on the vertical axis. When the spring load characteristic line is drawn on the graph with the vertical axis as the vertical axis, the spring load characteristic line when the elastic body is interposed is within the range of the suction force characteristic curve before the elastic body is interposed. It is possible to take measures to silence the electromagnetic relay within the range of the impressed voltage set before intervening.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay according to the present invention.

FIG. 2 is an exploded perspective view of a relay block of the electromagnetic relay according to the present invention.

FIG. 3 is an exploded perspective view of an electromagnet of the electromagnetic relay according to the present invention.

FIG. 4 is a sectional view of an electromagnetic relay according to the present invention.

FIG. 5 is an assembly process diagram of the electromagnetic relay according to the present invention.

FIG. 6 is a diagram illustrating the operation of the electromagnetic relay according to the present invention.

FIG. 7 is a cross-sectional view of a conventional electromagnetic relay.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic relay, 11 ... Base stand (body), 12 ... Hinge spring, 14 ... Armature, 14a ... One end, 14b ... Other end, 14c ... Valley part, 15 ... Contact spring, 15c ... Step part, 16 ... contact terminal plate, 17 ... electromagnet, 18 ... switch mechanism, 19 ... elastic body, 22 ... iron core, 23 ... yoke, 23d
…fulcrum.

Claims (2)

[Claims] A valley of an approximately L-shaped armature is applied to a fulcrum provided on a yoke of an electromagnet, and the armature is pressed toward the fulcrum by a hinge spring, and one end of the armature is attached to an iron core of the electromagnet. In the electromagnetic relay of the type in which the other end of the armature is made to face a switch mechanism provided on the base table, the armature is swung by the attraction of the iron core, and the switch mechanism is pushed by the armature, the switch mechanism A contact terminal plate provided on the base table, and a contact spring provided on the base table for performing a switching action by contacting or separating from the contact terminal plate;
An elastic body interposed between the contact spring and the contact terminal plate for reducing a sound generated when the contact spring collides with the contact terminal plate; and the contact for pressing the elastic body toward the base stand. An electromagnetic relay comprising a step provided on a spring. 2. A hyperbolic attractive force characteristic curve is drawn on a graph in which the horizontal axis represents the distance between the armature and the iron core, and the vertical axis represents the attractive force of the electromagnet. When a vertical axis represents a spring load characteristic line on a graph, the spring load characteristic line when the elastic body is interposed between the contact spring and the contact terminal plate is a suction line before the elastic body is interposed. The electromagnetic relay according to claim 1, wherein the electromagnetic relay is within a range of a force characteristic curve.