JP2002184290A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability and prevent malfunction while securing a noise reduction effect by an elastic member. SOLUTION: An elastic member 160 mounted on a movable iron piece 122 in contact with a leaf spring 121 is mounted in such a manner that the elastic member 160 is shear deformed by the contact of the leaf spring 121. A spring constant of the elastic member 160 is reduced from shear deformation to reduce a warp of the leaf spring 121. When a coil 130 is energized, the movable contact 120 and a stationary contact 110 surface contact to secure a designated contact area. Consequently, deterioration of durability from heat generation at the contact part can be prevented. Also, situations that the movable contact 120 cannot contact the stationary contact 110 even if the coil 130 is energized can be surely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay for opening and closing an electric circuit, and is effective when applied to an electromagnetic relay for a vehicle.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional electromagnetic relay (hereinafter, referred to as a relay). A movable iron piece 122 attracted to a fixed iron core 140 when a coil 130 is energized is swaged by a swaging portion 122a. It is integrated with the leaf spring 121. A plate-like rubber elastic member 160 is arranged between the leaf spring 121 and the movable iron piece 122.
60 is pressed against the movable iron piece 122 by the elastic force of the leaf spring 121.

[0003] Then, the energization of the coil 130 is cut off, and the caulked portion 120 a of the movable contact 120 is moved to the stopper 150.
When a collision occurs, the vibration of the leaf spring 121 is
Of the plate spring 121 so as to reduce the sound caused by the vibration of the leaf spring 121. (Hei 2-87
No. 51, Japanese Utility Model Laid-Open No. 5-27942,
No. 174684)

[0004]

However, in the above-mentioned conventional relay, the elastic member 160 made of rubber is compressed and deformed by the elastic force of the leaf spring 121. However, the elastic constant in the compression direction of rubber is large. The member 160 is not easily deformed, and therefore, a portion of the leaf spring 121 from the swaged portion 122a to the movable contact 120 is warped, and an inclination of an angle θ is generated between the member 160 and the movable iron piece 122.

[0005] Then, due to the warpage of the leaf spring 121,
When the coil 130 is energized, the movable contact 120 comes into contact with the fixed contact 110 in an inclined state. Therefore, both contact points 11
Nos. 0 and 120 are in a state close to a point contact, and the contact area is reduced, and the contact portion is liable to generate heat, resulting in a problem that durability is reduced.

Further, when the inclination angle θ is increased due to a variation in the thickness of the elastic member 160, there is a possibility that the movable contact 120 cannot contact the fixed contact 110 even when the coil 130 is energized.

The present invention has been made in view of the above points, and has as its object to improve durability and prevent malfunctions while ensuring the effect of reducing noise by an elastic member.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, an electromagnetic coil (130) that generates an electromagnetic force when energized, and a magnetic coil disposed in the electromagnetic coil (130). A fixed core (140) forming a path, and an electromagnetic coil (1) arranged opposite to the fixed core (140).
The movable iron piece (122) attracted to the fixed iron core (140) side by the electromagnetic force of (30) and the movable iron piece (122) are held and the movable iron piece (122) is urged away from the fixed iron core (140). The leaf spring (121) and the leaf spring (1)
And a movable contact (120) mounted on the movable coil (21) and an electromagnetic coil (130) disposed opposite to the movable contact (120).
An electromagnetic relay having a fixed contact (110) with which a movable contact (120) contacts when power is supplied to the movable iron piece (122), comprising an elastic member (160) attached to the movable iron piece (122) and contacting a leaf spring (121). The member (160) is characterized in that it is mounted so as to be sheared by the contact of the leaf spring (121).

According to this, when the power supply to the coil is cut off, the leaf spring is in contact with the elastic member, so that the vibration of the leaf spring is reduced by the vibration damping effect of the elastic member, and thus the vibration of the leaf spring is reduced. The resulting sound is reduced.

Further, since the elastic member undergoes shearing deformation, its spring constant is reduced and the warpage of the leaf spring is reduced, and when a coil is energized, the movable contact and the fixed contact come into surface contact to ensure a predetermined contact area. Therefore, it is possible to prevent a decrease in durability due to heat generation of the contact portion. Further, since the variation in the thickness of the elastic member (160) is also absorbed by the shearing deformation of the elastic member, it is possible to reliably prevent the movable contact from contacting the fixed contact even when the coil is energized.

According to the second aspect of the present invention, the elastic member (160) is formed in a plate shape, and the leaf spring (121) is brought into contact with a substantially central portion of one surface of the elastic member (160). At the same time, the outer edge of the other surface of the elastic member (160) is supported by the movable iron piece (122), and the movable iron piece (122) faces substantially the center of the other surface of the elastic member (160). The elastic member (160) is fixed to the fixed core (14).
By forming the relief portion (122c) that allows deformation toward the 0) side, the elastic member (160) can be sheared by the contact of the leaf spring (121).

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0013]

1 to 3 show an embodiment of an electromagnetic relay (relay) according to the present invention. FIG. 1 is a front view of the entire relay, and FIG. 2 is a leaf spring 121 and a movable iron piece 122. FIG. 1 is a view as seen from the direction A in FIG. 1 and FIG.
It is an enlarged view of the B section.

In FIGS. 1 and 2, reference numeral 110 denotes a fixed contact, and reference numeral 120 denotes a movable contact which comes into contact with and separates from the fixed contact 110. The movable contact 120 is a swaged portion 120a
And is attached to the distal end of the leaf spring 121.

An electromagnetic coil 13 that generates an electromagnetic force when energized
In 0 (hereinafter referred to as a coil), a fixed iron core 140 that forms a magnetic path is arranged. Then, the movable iron piece 12 attracted to the fixed iron core 140 side when the coil 130 is energized.
2 is integrated with the leaf spring 121 by caulking the three caulking portions 122a.

The leaf spring 121 is provided with a biasing force for moving the movable contact 120 away from the fixed contact 110 and the movable iron piece 12.
2 generates a biasing force in a direction away from the fixed core 140 and also serves as a part of an electric circuit.

The yoke 141 forms a magnetic path of a magnetic flux induced by the coil 130 and holds the coil 130 and the leaf spring 121. A first base provided with a yoke 141 and a fixed contact 110 is provided on a resin base 142.
A contact terminal 143, a second contact terminal 144 electrically connected to the movable contact 120 via the leaf spring 121,
And coil terminal 1 for supplying power to coil 130
45 and the like are inserted and fixed. A cover 146 covers the coil 130 and the like. Further, a metal stopper 150 is provided at a position facing the caulking portion 120a of the movable contact 120.
The stopper 150 is inserted and fixed to the base 142.

When the coil 130 is energized, the movable iron piece 122 is attracted to the fixed iron core 140 by the electromagnetic attraction force, and the movable contact 120 contacts the fixed contact 110.
The electrical circuit is closed. On the other hand, the coil 13
When the current supply to 0 is cut off, the movable contact 120 is separated from the fixed contact 110 by the elastic force of the leaf spring 121, and the electric circuit is opened.

Next, the features of this embodiment will be described. As shown in FIG. 3, the leaf spring 121 and the movable iron piece 122
The elastic member 160 is disposed between the two. The elastic member 160 is formed in a disk shape (circular flat plate shape) with resin, and more specifically, is made of rubber (for example, fluoro rubber) having a thickness of about 0 to 5 mm and having excellent elasticity and heat resistance.

The leaf spring 121 has a movable iron piece 122 at an intermediate position between the movable contact 120 mounting portion and the caulking portion 122a.
A protrusion 121a protruding to the side is formed.

On the other hand, the movable iron piece 122 has
A column-shaped concave portion 122b is formed at a position facing "a". The recess 122 b has a diameter slightly larger than that of the elastic member 160 and is formed at a depth substantially equal to the thickness of the elastic member 160. At the bottom of the concave portion 122b, a cylindrical relief portion 122c having a smaller diameter than the elastic member 160 is formed concentrically with the concave portion 122b.

After the elastic member 160 is housed in the concave portion 122b, the leaf spring 121 and the movable iron piece 122 are integrated, so that the protrusion 121a comes into contact with the approximate center of the elastic member 160, and the elastic member 160 Due to the elastic force of the leaf spring 121, the recess 1 is pressed against the bottom of the recess 122b.
22b.

Then, the substantially central portion of the elastic member 160 is pushed by the elastic force of the leaf spring 121.
2c, the substantially central portion of the elastic member 160 is fixed core 1
It can be sheared to the 40 side. At this time, the spring constant of the elastic member 160 at the time of shearing deformation is desirably set to one fifth or less of the spring constant of the leaf spring 121.

According to the embodiment having the above configuration, the coil 1
30 is cut off, and the swaged portion 1 of the movable contact 120 is cut off.
When the stopper 20 a collides with the stopper 150, the protrusion 121 a of the leaf spring 121 is in contact with the elastic member 160.
The vibration of the leaf spring 121 is reduced by the vibration damping effect of the elastic member 160, and the sound caused by the vibration of the leaf spring 121 is reduced.

The fixed iron core 1 of the elastic member 160
A relief portion 122 is provided at a position facing a substantially central portion of the surface on the 40 side.
c, the elastic member 160 is supported at the outer edge of the surface of the elastic member 160 on the fixed core 140 side. Deform to the side.

Since this deformation is a shear deformation, the spring constant is smaller than the spring constant at the time of compression deformation, and the elastic member 160 is easily deformed. Therefore, the leaf spring 1
The warpage of the portion from the caulking portion 122a to the movable contact 120 in 21 is reduced, and the inclination angle θ between the movable iron piece 122 and the movable contact 120 is also reduced.

As described above, when the warp of the leaf spring 121 is reduced, when the coil 130 is energized, the movable contact 120 and the fixed contact 110 come into surface contact near the center, and a predetermined contact area is secured. A decrease in durability due to heat generation can be prevented. In addition, even when the coil 130 is energized, the situation where the movable contact 120 cannot contact the fixed contact 110 can be reliably prevented.

The thickness of the elastic member 160 and the relief portion 1
By changing the diameter of 22c, the spring constant of elastic member 160 can be easily adjusted.

Further, by making the elastic member 160 circular, the directivity at the time of assembling the elastic member 160 is eliminated,
The assembly can be simplified.

(Other Embodiments) In the above embodiment, the elastic member 160 made of rubber is used, but an elastic member made of foamed elastic resin such as sponge may be used.

The escape portion 122c of the movable iron piece 122
May be penetrated to the surface of the movable iron piece 122 on the side facing the fixed iron core 140.

Further, the elastic member 160, the recess 122b,
The relief portion 122c need not be a disk or a column. That is, it is only necessary that the elastic member 160 can be sheared when the elastic force of the leaf spring 121 acts on the elastic member 160.

The present invention is also applicable to a relay in which a second fixed contact is provided instead of the stopper 150 at the position where the stopper 150 is provided.

[Brief description of the drawings]

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

FIG. 2 is a view of the leaf spring 121 and the movable iron piece 122 of FIG. 1 as viewed from the direction indicated by an arrow A in FIG.

FIG. 3 is an enlarged view of a portion B in FIG. 1;

FIG. 4 is a front view showing a conventional electromagnetic relay.

[Explanation of symbols]

110: fixed contact, 120: movable contact, 121: leaf spring, 122: movable iron piece, 130: electromagnetic coil, 140 ...
Fixed iron core, 160 ... elastic member.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Tsukada 3rd Iyama, Shinomecho, Anjo City, Aichi Prefecture Anden Corporation (72) Inventor Koji Kawaguchi 3rd Iyama, Shinomecho, Anjo City, Aichi Prefecture Anden Corporation

Claims (2)

[Claims] 1. An electromagnetic coil (130) for generating an electromagnetic force when energized, a fixed core (140) arranged in the electromagnetic coil (130) to form a magnetic path, and opposed to the fixed core (140). The fixed core (14) is arranged by the electromagnetic force of the electromagnetic coil (130).
A movable iron piece (122) attracted to the 0) side; and a leaf spring (121) that holds the movable iron piece (122) and urges the movable iron piece (122) away from the fixed iron core (140). A movable contact (120) mounted on the leaf spring (121);
The movable contact (120) is disposed to face the movable contact (120), and is energized when the electromagnetic coil (130) is energized.
And a fixed contact (110) with which the leaf spring (12) is attached to the movable iron piece (122).
1) An electromagnetic relay, comprising: an elastic member (160) with which the plate spring (121) comes into contact, and the elastic member (160) is mounted so as to be sheared by the contact of the leaf spring (121). 2. The elastic member (160) is formed in a plate shape, and the plate spring (121) is in contact with a substantially central portion of one surface of the elastic member (160), and the elastic member (160) is in contact with the elastic member (160). ) Of the other surface is supported by the movable iron piece (122), and the movable iron piece (122) includes the elastic member (160).
A relief portion (122c) that allows the elastic member (160) to deform toward the fixed iron core (140) is formed at a position facing the substantially central portion of the other surface of the first member. The electromagnetic relay according to claim 1.