JP2625912B2 - Electromagnetic relay - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay, and more particularly, to an electromagnetic relay having a movable contact spring block and a coil assembly.

[Conventional technology]

Conventionally, this type of electromagnetic relay connects a movable contact spring block and a coil assembly, and the movable spring block is tilted by a permanent magnet provided in the coil assembly.

FIG. 5 is an exploded view of parts of an electromagnetic relay showing an example of the related art.

As shown in FIG. 5, this electromagnetic relay comprises a coil assembly 2 in which a permanent magnet 2c fixed by an insulator 2e is disposed at the center of a U-shaped iron core 2b wound with a coil 2a, and both magnetic poles of the iron core 2b. The movable contact spring block 1 in which the armature 1a, the hinge spring 1c, and the movable contact spring 1b, which are arranged so that both ends are adapted to the portion, are integrally fixed by the insulating fixed body 1d is fixed, and the contact formed on the armature 1a is fixed. The tilting movement is performed with the pole piece central convex portion 1e as a fulcrum. The block 1 of the movable contact spring is shown with the back surface facing upward. When the block 1 is fixed to the coil assembly 2, the back surface is engaged with the upper surface of the coil assembly 2. Note that insulator 2e
2d is a terminal for winding the coil.

[Problems to be solved by the invention]

The above-described conventional electromagnetic relay requires notches at both ends of the U-shaped iron core and minute gaps at both end faces of the armature, and in order to secure this gap, the movable contact spring block and the coil assembly are required. Special jigs and tools that determine the positional relationship are required.

That is, the notch at both ends of the U-shaped iron core determines the positional relationship between the coil assembly and the movable contact spring block, and the U-shaped iron core and the armature are formed by the permanent magnets disposed at the center of the U-shaped iron core. Due to the flow path of generated magnetic flux, accurate positional relationship cannot be specified, stable characteristics cannot be obtained, vertical dimension shift due to wear, impact resistance is poor, etc. Has the disadvantage of

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay capable of obtaining a stable characteristic of such a tilting motion, and enhancing impact resistance and abrasion resistance.

[Means for solving the problem]

The electromagnetic relay of the present invention is a coil assembly in which a permanent magnet is arranged at the center of a U-shaped iron core wound with a coil, an armature arranged so that both ends are adapted to both magnetic pole portions of the iron core, and A movable contact spring block in which a hinge spring for causing the armature to perform a tilting movement and a movable contact spring disposed near the armature are integrally fixed to an insulating fixed body;
In an electromagnetic relay performing a tilting movement with a convex portion formed at the center of the armature on the upper surface of the permanent magnet as a fulcrum, a convex portion or a concave portion is formed on an insulator near both ends of the permanent magnet of the coil assembly, In addition, a concave portion or a convex portion is formed in the center of the insulating fixed body of the movable contact spring block, and the convex portion or the concave portion is configured to fit with a small gap.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded view of parts of an electromagnetic relay showing a first embodiment of the present invention.

As shown in FIG. 1, the movable contact spring block 1 constituting this electromagnetic relay is shown with its back face up as in the conventional example, and the armature 1a, the movable contact spring 1b and the hinge spring 1c are connected to an insulating fixed body 1d. In addition, a protrusion 1e is provided at the center of the armature 1a, and a protrusion 1f is formed on the insulating fixed body 1d. The coil assembly 2 is composed of a U-shaped iron core 2b wound with a coil 2a and an insulator 2e formed by molding a permanent magnet 2c and a tie terminal 2d, and furthermore, an insulation near the end of the permanent magnet 2c. A recess 2f is formed in the body 2e. By matching the movable contact spring block 1 and the coil assembly 2 described above, the upper surface of the permanent magnet 2c and the armature protrusion 1e serve as a fulcrum of the tilting movement, and the protrusion 1f and the recess 2f are fitted with a minute gap. .

FIG. 2 is a central cross-sectional view in a state where the electromagnetic relay parts in FIG. 1 are assembled.

As shown in FIG. 2, when the movable contact spring block 1 is reversed (the back surface is set to the fitting side) and assembled into the coil assembly 2, the protrusion 1e and the permanent magnet 2c, and the protrusion 1f and the recess 2f are formed. Respectively engaged.

FIG. 3 is an exploded view of parts of an electromagnetic relay showing a second embodiment of the present invention.

As shown in FIG. 3, the movable contact spring block 1 is formed by integrally fixing an armature 1a, a movable contact spring 1b, and a hinge spring 1c with an insulating fixed body 1d, and forms a convex portion 1e at the center of the armature 1a. Then, a concave portion 1f 'is formed in the insulating fixed body 1d. On the other hand, the coil assembly 2 is composed of a U-shaped iron core 2b wound with a coil 2a and an insulator 2e molded with a permanent magnet 2c and a tying terminal 2d, and furthermore, an insulation near both ends of the permanent magnet 2c. body
A projection 2f 'is formed on 2e. When the above-described spring block 1 and the coil assembly 2 are fitted together, the upper surface of the permanent magnet 2c and the armature convex portion 1e become the fulcrum of the tilting motion, and the concave portion 1f 'and the convex portion 2f
Fits with very small voids.

FIG. 4 is a central cross-sectional view in a state where the electromagnetic relay parts in FIG. 3 are assembled.

As shown in FIG. 4, this case is also the same as FIG. 2, except that the side on which the projections are formed and the side on which the recesses are formed are reversed, and the operation of the relay is the same.

〔The invention's effect〕

As described above, the electromagnetic relay of the present invention has a concave portion or a convex portion near both ends of the permanent magnet of the coil assembly, and a convex portion or a concave portion at the center of the insulating fixed body constituting the movable contact spring block. The following effects can be obtained by providing and adapting with a minute gap.

(1) Since the magnetic gap between the notch at the end of the U-shaped iron core and the armature can be maintained at a constant distance, stable characteristics can be obtained and variations in the electrical characteristics of individual products can be reduced. It can be kept to a minimum.

(2) By setting the fulcrum at which the movable contact spring block performs the tilting movement at three points of the armature and the two convex portions or concave portions, it is possible to suppress vertical dimensional fluctuation and generation of foreign matter due to wear.

(3) The lateral movement of the movable contact spring block is restricted, and the deformation of the hinge spring caused by the movement of the armature caused by the impact can be avoided, so that the vibration resistance and the shock resistance are greatly improved.

[Brief description of the drawings]

FIG. 1 is an exploded view of parts of an electromagnetic relay showing a first embodiment of the present invention, FIG. 2 is a central cross-sectional view of an assembled state of the electromagnetic relay parts in FIG. 1, and FIG. FIG. 4 is an exploded view of a part of the electromagnetic relay showing the second embodiment, FIG. 4 is a central cross-sectional view in a state where the parts of the electromagnetic relay in FIG. 3 are assembled, and FIG. It is a development view. Reference numeral 1: movable contact spring block, 1a: armature, 1b: movable contact spring, 1c: hinge spring, 1d: insulating fixed body, 1e
…… Protrusion at the center of the armature, 1f …… Protrusion at the insulation fixing body, 1f '
Insulation fixing body recess, 2 ... Coil assembly, 2a ... Coil,
2b: U-shaped iron core, 2c: Permanent magnet, 2d: Terminal for brazing, 2e: Insulator, 2f: Insulator recess, 2f ': Insulator protrusion.

Claims (1)

(57) [Claims] 1. A coil assembly comprising a U-shaped iron core having a coil wound thereon and a permanent magnet disposed in a central portion thereof, an armature arranged so that both ends thereof are adapted to both magnetic pole portions of the iron core, and the armature. A movable contact spring block in which a hinge spring for causing the armature to perform a tilting motion and a movable contact spring disposed in the vicinity of the armature are integrally fixed to an insulating fixed body, and a center of the armature on the upper surface of the permanent magnet. In the electromagnetic relay performing the tilting movement with the convex portion formed in the portion as a fulcrum, a concave portion or a convex portion is formed in the insulator near both ends of the permanent magnet of the coil assembly, and the insulating fixed body of the movable contact spring block is formed. An electromagnetic relay, wherein a convex portion or a concave portion is formed in a central portion, and the convex portion or the concave portion is fitted with a minute gap.