JPH0652774A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To reduce noise at operation by providing a leaf spring on the movable part of a movable contact spring, and weakening colliding force by the deflective deformation of the leaf spring at the time of collisions between an armature and a core and between a movable contact and a fixed contact. CONSTITUTION:An electromagnetic relay has a relay body 2, a L-shaped yolk for forming a magnetic passage, a spool placed on the relay body 2 with a coil being wound thereon, and a core one end of which is connected to the yolk. A leaf spring 1 is mounted on a movable contact spring 8 as a shock absorber. The leaf spring 1 follows an armature 6 attracted by the magnetic pole surface of the core and displaced to press both the raised ends onto the surface of a fixed contact spring 9 which is a fixed member, and deflected and deformed. This deformation weakens the colliding force between the armature 6 and the core and the colliding force between a movable contact 8a and a fixed contact 9a, and colliding noise generated from the relay can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay, and more particularly to a noise reduction type electromagnetic relay.

[0002]

2. Description of the Related Art A conventional electromagnetic relay has a structure as shown in FIG. This figure is a perspective view of a state where the cover of the electromagnetic relay is removed, and the spool 3a around which the coil 3 is wound, the L-shaped yoke 5 and the core are mounted on the relay main body 2. The core provided in the relay main body 2 has one end coupled to the yoke 5 and the other end facing the armature 6.

The armature 6 is supported by a hinge spring 7 fixed to the yoke 5 and performs a suction operation with other terminals of the core. A movable contact spring 8 is attached to the armature 6 by a circular boss 10, and a movable contact 8 a fixed to the tip of the movable contact spring 8 a is fixed to a fixed contact spring 9.
Opening and closing operations are performed with a.

The pair of fixed contact springs 9 are formed in the relay body 2
And is led out from the lower surface as the terminal 12.

In the electromagnetic relay having such a structure, the armature 6 is attracted to or separated from the core by the excitation / non-excitation of the coil 3, and the movable contact 8a is lifted or dropped to the fixed contact 9a through the movable contact spring 8 interlocked with the armature 6. Then, the ON-OFF operation is performed. The electromagnetic relay is protected by a plastic case 11 or the like.

There is also a conventional electromagnetic relay to which a sound deadening structure is applied. As disclosed in Japanese Utility Model Laid-Open No. 2-1841, this is also a noise-reduction type electromagnetic relay having an electrically insulating liquid and a blade piece for flowing the liquid in the space inside the case accommodating the relay body. is there.

[0007]

In the above-mentioned conventional electromagnetic relay, both the armature to be attracted or separated and the core are made of a metal material. Therefore, the core and the armature are corresponding to the excitation or non-excitation of the coil. There is a drawback that a loud collision sound is generated each time the vehicle collides and separates. Further, the collision sound between the movable contact and the fixed contact has the same problem.

On the other hand, an electromagnetic relay using a liquid is required to have airtightness and the like, so that there is a problem that it becomes complicated and expensive.

An object of the present invention is to provide an electromagnetic relay in which noise during operation is reduced.

[0010]

To achieve the above object, an electromagnetic relay according to the present invention is an electromagnetic relay having an armature, a pair of a movable contact and a fixed contact, and a shock absorbing material. Supported by the hinge spring of the yoke and displaced by the magnetic force of the coil, the movable contact is attached to the armature via the movable contact spring, and the fixed contact is attached to the fixed member to face the movable contact. The pair of the movable contact and the fixed contact is provided to open and close according to the displacement of the armature, and the shock absorbing material is a spring material attached to the movable contact spring,
It is projected to the front beyond the movable contact, and is pressed and deformed by the fixed member according to the displacement of the armature to absorb the shock generated when the contact is lifted.

[0011]

The shock absorbing material absorbs the shock generated when the contact is lifted due to the bending deformation. Therefore, the collision noise is reduced.

[0012]

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

(Embodiment 1) FIG. 1 is a longitudinal sectional view showing an electromagnetic relay according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing the movable contact spring in FIG.

The electromagnetic relay according to the present invention has a structure similar to that of the structure shown in FIG. 5, in which the main body 2 of the relay, the L-shaped yoke 5 for forming the magnetic path, and the coil 3 are wound on the main body 2. And a core 4 whose one end is coupled to the yoke 5.

Further, since the movable portion is constructed in this embodiment,
A hinge spring fixed to the yoke 5 (corresponding to 7 in FIG. 5) and a relay main body 2 supported by the hinge spring 2
An armature 6 facing the magnetic pole surface of a core 4 arranged in the center of a spool 3a of a coil 3 provided in the coil 3; and a movable contact spring 8 fixed to the armature 6 with a circular boss 10 and provided with a movable contact 8a at its tip. A fixed contact spring 9 having a fixed contact 9a fixed to the relay main body 2 and in contact with the movable contact 8a, and a cover 11 for covering the relay main body 2.

Further, according to the present invention, as shown in FIGS. 1 and 2, a leaf spring 1 as a shock absorbing material is attached to a movable contact spring 8. The leaf spring 1 rises from the both side edges of the movable contact spring 8 over the top of the movable contact 8a to the front of the front surface, and the rising portion expands in an eight shape with a gentle inclination angle.

The leaf spring 1 follows the armature 6 which is attracted and displaced by the magnetic pole surface of the core 4, and its both rising edges are pressed against the surface of a fixed contact spring 9 which is a fixed member.
The bending deformation causes the collision force between the armature 6 and the core 4 and the collision force between the movable contact 8a and the fixed contact 9a to be weakened, and the collision noise generated from the relay can be reduced.

(Second Embodiment) FIG. 2 is a perspective view showing a movable contact spring 8 according to a second embodiment of the present invention. In the present embodiment, the leaf spring 1 is arranged near the fixed portion of the armature 6 in the movable contact spring 8. The leaf spring 1 is pressed against a fixed member other than the fixed contact spring to be flexibly deformed.
Such a structure is particularly effective in reducing the collision noise between the armature 6 and the core 4. The rest of the structure and the operation of each part are the same as in the first embodiment.

FIG. 4 is a collision sound characteristic diagram in the embodiment of the present invention. As shown in FIG. 4, since the above-mentioned relay can weaken the collision force by the leaf spring 1, the relative loudness of the collision noise can be reduced to about half that of the conventional one.

[0020]

As described above, in the electromagnetic relay of the present invention, the impact absorbing material attached to the movable contact spring is flexibly deformed to reduce the collision force at the time of opening and closing the contacts. There is an effect that the collision sound of can be reduced to about half.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a movable contact spring according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a movable contact spring according to a second embodiment of the present invention.

FIG. 4 is a collision sound characteristic diagram in the embodiment of the present invention.

FIG. 5 is a perspective view of an electromagnetic relay showing a conventional example with a cover removed.

[Explanation of symbols]

 1 leaf spring 2 relay body 3 coil 3a spool 4 core 5 yoke 6 armature 7 hinge spring 8 movable contact spring 8a movable contact 9 fixed contact spring 9a fixed contact 10 boss 11 cover 12 terminal

Claims (1)

[Claims] 1. An electromagnetic relay having an armature, a pair of a movable contact and a fixed contact, and a shock absorbing material, wherein the armature is supported by a hinge spring of a yoke and is displaced by receiving a magnetic force of a coil. Yes, the movable contact is attached to the armature via the movable contact spring, the fixed contact is attached to the fixed member so as to face the movable contact, and the pair of the movable contact and the fixed contact opens and closes according to the displacement of the armature. The shock absorbing material is made of a spring material attached to the movable contact spring, protrudes to the front beyond the movable contact, and is pressed and deformed by the fixed member according to the displacement of the armature,
An electromagnetic relay characterized by absorbing shocks generated when the contacts are lifted.