JP2724370B2 - Electromagnetic relay - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hinge type electromagnetic relay in which a movable iron piece is swingably supported by an electromagnet block.

(Prior Art) Conventionally, there is an electromagnetic relay of this type shown in FIGS. 8 and 10. FIG.

In FIG. 8, an electromagnet block 60 is assembled on a base 61 with its yoke 62 facing upward. As shown in FIG. 9, movable iron pieces 63a and 63b are provided on both ends of the end of the yoke 62. By engaging notches 65a, 65b formed on both sides of one end of the movable iron piece 64, the movable iron piece 64 is hinged and urged by the coil spring 66 to the return side, while the movable iron piece is
A contact mechanism is constituted by a movable contact piece 67 fixed to 64 and fixed contact terminals 68a, 69b fixed to the base 61.

In FIG. 10, an electromagnet block 60 substantially the same as that shown in FIG. 8 is assembled by setting a yoke 62 upright on a base 61, and as shown in FIG.
The movable iron piece 69 bent in the shape of a letter is folded into the yoke 62
The movable iron piece 69 is hinge-supported by pressing the bent outer surface of the movable iron piece 69 with a hinge spring 70 fixed to the yoke 62 while being placed in contact with the tip angle 62a of the The contact mechanism is constituted by erecting the terminals 71a, 71b and the movable contact piece 72, and a guard 73 is interposed between the movable contact piece 72 and the movable iron piece 69.

(Problems to be Solved by the Invention) However, in the configuration shown in FIG. 8, the electromagnet block 60 is assembled on the base 61 at a certain interval, and the movable iron piece 64 is provided with notches 65a and 65b. The movable iron piece 6 is engaged with the protrusions 63a and 63b of the yoke 62.
Since the upper end of 4 protrudes from yoke 62 and coil spring 66 is attached above yoke 62, there is a problem that the height is large.

On the other hand, in the one shown in FIG. 10, the electromagnet block 60 is mounted vertically,
Since the movable iron piece 69 in the shape of a letter is placed and it is necessary to secure a space for the swinging allowance of the movable iron piece 69, the height dimension is large as in the case shown in FIG. There was a problem. In addition, this thing
Because the hinge spring 70 is used to support the hinge,
As shown in FIG. 11, a hinge spring 70 fixed to the yoke 62
Must be passed through a hole 74 provided in the movable iron piece 69 to be pressed against the outer surface of the bent portion, and there is a problem that the assembling property is poor.

The present invention has been made in view of such a problem, and an object of the present invention is to provide an electromagnetic relay that has a small height and can be miniaturized, and has good assemblability.

(Means for Solving the Problems) To achieve the above object, the present invention provides an electromagnet block in which a substantially L-shaped yoke is fixed to one end of a core around which a coil is wound. In the electromagnetic relay in which the movable iron piece supported by the hinge is swung to drive the contact mechanism, the tip end surface of the yoke forms a groove-shaped hinge hole forming a part of the wall surface on the base,
Projections are provided at both ends of one end of the movable iron piece, the projections are fitted into the hinge holes, and the upper part of the projections is covered with projections projecting from the electromagnet block.

(Operation) According to the above configuration, the projecting portion of the movable iron piece is hingedly supported by the groove-shaped hinge hole wall surface whose yoke tip surface forms a part of the wall surface and the projection of the electromagnet block.

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

1 to 5 show an electromagnetic relay according to the present invention,
This electromagnetic relay generally includes a base 1, an electromagnet block 2, a movable iron piece 3, a contact mechanism 4, and a card 5.

As shown in FIG. 1, the base 1 is partitioned into an electromagnet side on the left side in FIG. 1 and a contact side on the right side by an insulating wall 10 erected at a position slightly closer to the center of the upper surface.

On the electromagnet side of the base 1, there is formed a recess 11 in which a yoke 23 of the electromagnet block 2 described later is embedded, and at a position adjacent to the recess 11 and in the vicinity of the base of the insulating wall 10, insulating material is provided. A groove-shaped hinge hole 12 is formed along the wall 10. When the yoke 23 is buried in the concave portion 11, as shown in FIGS. 3 and 4, the end surface of the yoke 23 forms one wall surface of the hinge hole 12. Insulating wall 10
As shown in FIG. 1, a stopper 13 having an inclined end face 13a with which the movable iron piece 3 described later comes into contact is protruded in the central longitudinal direction of the electromagnet side wall face.

On the other hand, as shown in FIGS. 2 and 3, a contact stopper 14 for preventing fixed contact terminals 41a and 41b, which will be described later, from tilting to the side facing each other is provided upright on the contact side of the base 1. I have. In addition, the insulating wall for contact is perpendicular to the insulating wall 10.
The movable contact piece 43 is provided by the contact insulating wall 15.
An insulation distance between the fixed contact terminals 41a and 41b is secured.

In addition, both ends of the base 1 are provided with locking claws 16a and 16b for fixing a case (not shown).

The electromagnet block 2 includes a coil 20 as shown in FIG.
The core 22 is inserted into the spool 21 around which the core is wound, and a substantially L-shaped yoke 23 is fixed to one end of the core 22 by caulking. As shown in FIG. 22a are formed on the same plane. One flange of the spool 21 of the electromagnet block 2 has coil terminals 24a, 24b
Are provided by insert molding. Protrusions 25a, 25b (the other is not shown) that cover the hinge holes 12 are provided on both sides of the lower end of the other flange of the spool 21, and the upper end of the card 5 in the horizontal direction of the card 5 described later is provided on the upper end. A protruding piece 26 is provided to prevent runout.

As shown in FIG. 1, the movable iron piece 3 is of a flat plate shape, and protruding portions 30a, 30b are protrudingly provided on both side ends of a lower end, and engaging portions 50a, 50b of the card 5 described later are provided on the upper end. A pair of locking claws 31a and 31b for locking are formed.
A contact surface 32 protrudes from a surface facing the iron core 22.

The contact mechanism 4 includes a fixed contact terminal 41a having a fixed contact 40a.
A fixed contact terminal 41b having a fixed contact 40b, and a movable contact
A movable contact piece 43 having a movable contact 42 is press-fitted and fixed to the contact side of the base 1 so that the movable contact 42 is located between the fixed contacts 40a and 40b. And the movable contact piece 43
As shown in FIG. 3, the movable contact 42 is
It is urged toward the fixed contact terminal 41a so as to be pressed against a. As shown in FIG. 1, notches 44a and 44b are formed on both ends of the upper end of the movable contact piece 43 to engage with later-described engaging portions 51a and 51b of the card 5, respectively.

The card 5 has a plate shape of a substantially C-shape in plan view, and engaging portions 50a, 5 on both ends of which the locking claws 31a, 31b of the movable iron piece 3 are locked.
0b is formed, and engaging portions 51a and 51b that engage with the notches 44a and 44b of the movable contact piece 43 are formed inside the intermediate portion.

In the electromagnetic relay having the above configuration, first, the lower end of the movable iron piece 3 is fitted into the hinge hole 12 of the base 1, and then the coil terminals 24 a and 24 b of the electromagnet block 2 are pressed into the base 1,
The yoke 23 is embedded in the recess 11 of the base 1. This allows
As shown in FIG. 3, the distal end surface of the yoke 23 forms one wall surface of the hinge hole 12, and at the same time, the protrusions 25a, 25b of the spool 21 are formed.
Covers the protrusions 30a, 30b of the movable iron piece 3 from above, so that the protrusions 30a, 30b are surrounded by the four surfaces formed by the hinge holes 12 and the protrusions 25a, 25b and are hinged. Therefore, the movable iron piece 3 is assembled so as to be swingable about the protruding portions 30a and 30b.

Next, after the fixed contact terminals 41a and 41b and the movable contact piece 43 are press-fitted into predetermined positions of the base 1, the card 5 is connected to the contact mechanism 4
And the movable contact piece 43 with the engaging portions 51a, 51b.
The notches 44a, 44b of the movable iron piece 3 are engaged with the engaging portions 50a, 50b so that both ends thereof are opened.
Lock a and 31b. Thereby, the movable iron piece 3 is connected to the movable contact piece 43 via the card 5, and
As shown in the drawing, the movable contact piece 43 is urged in a direction in which the movable contact piece 43 comes into pressure contact with the inclined end surface 13a of the stopper 13.

Then, cover the case (not shown) with the locking claw of the base 1.
After engaging with 16a and 16b, a sealant is applied and sealed as appropriate.

When the electromagnetic relay assembled as described above is not excited, the movable contact piece 43 urged leftward in FIG.
The movable contact 42 is separated from the fixed contact 40b and closed with the fixed contact 40a, and the movable iron piece 3 is separated from the magnetic pole surface 22a of the iron core 22 and tilts toward the stopper 13 to return. Here, since the stopper 13 receives the back surface of the movable iron piece 3 linearly in the longitudinal direction (up-down direction) at its inclined end face 13a, the movable iron piece 3 is in a stable state.

In this state, when the coil 20 is energized to excite the electromagnet block 2, the movable iron piece 3 is attracted to the magnetic pole surface 22a of the iron core 22 and rotates clockwise in FIG. 3 around the protruding portions 30a, 30b. Then, as a result of pulling the movable contact piece 43 through the card 5 in the center right direction in the figure against the urging force, the movable contact 42 is separated from the fixed contact 40a and closed to the fixed contact 40b, and the contact is switched. Can be

During this operation, the insulation distance between the electromagnet side and the contact side is sufficiently ensured by the insulating wall 10, so that the withstand voltage characteristics are improved.

When the energization of the coil 20 is cut off, the attractive force of the electromagnet block 2 is lost, and the movable contact piece 43 returns to the left in FIG. 3 by the urging force. Rotates counterclockwise around 30b. At this time, since the inclined end surface 13a of the stopper 13 linearly receives the back surface of the movable iron piece 3 in the longitudinal direction, local collision does not occur, generation of wear powder is suppressed, and the return state is stabilized. Even if abrasion powder is generated, the insulation wall
10 prevents diffusion to the contact side.

In the above embodiment, the projections 25a and 25b for hinge-supporting the movable iron piece 3 are provided on the spool 21, but a part of the spool 21 is provided like the projections 27a and 27b shown in FIG. It may be bent to have elasticity, or a part of the yoke 23 may be protruded and protruded like the protruding portions 28a and 28b shown in FIG.

When formed like the protrusions 27a and 27b shown in FIG. 6, the electromagnet block 2 is first attached to the base 1 and then the movable iron piece 3 is
It can be assembled by pushing along a. Even after the movable iron piece 3 is assembled, the protrusion 27
The movable iron piece 3 can be removed by appropriately resiliently deforming the a and 27b and retreating from the hinge hole 12.

(Effects of the Invention) As is clear from the above description, according to the present invention, the projecting portion of the movable iron piece is provided between the wall surface of the hinge hole in which the yoke tip surface forms a part of the wall surface and the projecting portion of the electromagnet block. Since it is surrounded and supported by the hinge, the movable iron piece does not protrude from the yoke, the dimension in the height direction can be reduced, and the size can be reduced. Further, since the movable iron piece is hinge-supported only by assembling the movable iron piece and the electromagnet block on the base, the structure is simple, and there are effects such as good assemblability.

[Brief description of the drawings]

1, 2, and 3 are an exploded perspective view, a plan view, and a front view, respectively, of the electromagnetic relay according to the present invention, FIG. 4 is a right side half sectional view of FIG. 3, and FIG. FIG. 6, left side view,
FIG. 7 is a partial perspective view showing another embodiment of the projection of the electromagnet block, FIG. 8 is a front view of a conventional electromagnetic relay, and FIG. 9 is an exploded perspective view of a hinge of the movable iron piece shown in FIG. FIG. 10 is a front view of another conventional electromagnetic relay, and FIG. 11 is a perspective view of a hinge portion of the movable iron piece shown in FIG. DESCRIPTION OF SYMBOLS 1 ... Base, 2 ... Electromagnetic block, 3 ... Movable iron piece, 4 ... Contact mechanism, 12 ... Hinge hole, 20 ... Coil, 22 ... Iron core, 23 ... Yoke, 25a, 25b, 27a, 27b, 28a, 28b: Projection, 30a, 30b: Projection.

Claims (1)

(57) [Claims] A contact mechanism is driven by exciting and de-energizing an electromagnet block in which a substantially L-shaped yoke is fixed to one end of an iron core around which a coil is wound, whereby a movable iron piece hinge-supported at the tip of the yoke is swung. In the electromagnetic relay, the tip end surface of the yoke is formed on the base with a groove-shaped hinge hole forming a part of the wall surface, while the projecting portions are provided at both ends of one end of the movable iron piece, and the projecting portion is formed. An electromagnetic relay, wherein the electromagnetic relay is fitted in the hinge hole and the upper part of the protrusion is covered by a protrusion provided on an electromagnet block.