JPH0735274Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnetic relay, and more particularly to a mounting structure for a leaf spring mounted on a movable iron piece thereof.

(Problems to be Solved by Prior Art and Invention) Conventionally, as a leaf spring attachment structure attached to a movable iron piece of an electromagnetic relay, for example, ones shown in FIGS. 7 to 10 have been proposed.

That is, the movable iron piece 42 is bent in a substantially L-shaped cross section, and one end portion 45a of the leaf spring 45 bent in a substantially V-shaped cross section is caulked and fixed to the outer surface of the horizontal portion 42a. on the other hand,
The spool 33 has a through hole 36 in a body portion 34 around which a coil 35 is wound, and a bending and raising portion 44 of a yoke 41 bent into a substantially J shape is inserted into the through hole 36 so that the spool 33 is held by the yoke 41. (Fig. 5).

Then, the horizontal portion 42a of the movable iron piece 42 is inserted from the other opening of the through hole 36, and the lower end portion of the vertical portion 42b is rotatably positioned at the tip end portion 41a of the yoke 41, and the leaf spring 45 is formed. Bend the wide part 45b to spool 33
Of the through hole 36 by engaging with a pair of slits 32b (the front side slit is not shown in FIG. 7) provided in the collar portion 32 of
After attaching the drive plate 43 to the tip of the movable iron piece 42 projecting from the above, the spool 33 is placed and fixed on the upper surface of the base 10 incorporating the fixed contact terminal 21 and the movable contact terminal 22, and the case 50 is mounted. By assembling and sealing, the assembly work is completed.

However, in the conventional electromagnetic relay, the leaf spring
Bend 45, and widen the wide part 45b into slit 3 of spool 33.
As it engages 2b, it takes time to assemble and
When the leaf spring 45 is bent, it is likely to be plastically deformed, resulting in a poor yield.

Therefore, as shown in FIG. 11, a method of bending the lower end portion of the leaf spring 45 and fixing it by crimping or spot welding to the tip end portion 41a of the yoke 41 has been proposed, but the number of assembly steps increases, There was a problem that productivity was low.

The present invention has been made in view of the above problems, and an object thereof is to provide an electromagnetic relay that is easy to assemble, has excellent productivity, and has a high yield.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention winds a coil around a base and a body having a collar at least at one end, and mounts and fixes the coil on the upper surface of the base. A resin spool and a movable iron piece that is bent into a substantially L-shaped cross section, is inserted into a through hole formed in the body of the spool at a horizontal portion, and is rotatably supported in the plate thickness direction with a vertical lower end as a fulcrum. And a leaf spring that is bent in a substantially V-shaped cross section, one end of which is fixed to the horizontal portion of the movable iron piece and the other end of which has a wide portion, which excites and demagnetizes the coil. As a result, in the electromagnetic relay that drives the contact mechanism section with the movable iron piece that rotates via the leaf spring, of the long side edges of the wide portion of the leaf spring, temporary edges are attached to both ends of the movable iron piece side. While the stop claw portion is provided, the plate is attached to the collar portion of the spool. A step portion that can be in surface contact by inserting the temporary fixing claw portion provided in the wide portion of the spring is provided, and the wide portion of the leaf spring inserted in the step portion can be retained on the upper surface of the base. It is configured to have a projecting wall.

(Operation) Therefore, according to the present invention, the wide portion of the leaf spring is positioned between the step portion provided on the collar portion of the spool and the projecting wall protruding from the upper surface of the base.

(Embodiment) An embodiment according to the present invention will be described below with reference to the accompanying drawings of FIGS. 1 to 6.

The electromagnetic relay according to the present embodiment is generally a box base 10
A contact mechanism section 20, an electromagnet section 30, a drive mechanism section 40,
It consists of a case 50.

The box base 10 has an internal space 11 capable of accommodating a contact mechanism section 20 described later, and openings 12 and 13 are provided on adjacent side surfaces, respectively, while a barrier 14 is provided on an upper surface edge located above the opening 12. Is protruding. Further, the box base 10 has a barrier 15 protruding from one end of the barrier 14 in a direction perpendicular to the upper surface of the box base 10, and opens upward near the outside of the barrier 15 to communicate with the internal space 11. An opening 17 is provided (FIG. 2). In addition, the box base 10 has a movable iron piece, which will be described later, on the upper surface edge portion located above the opening 13.
A locking projection wall 18 that locks the leaf spring 45 of 42 is provided.

The contact mechanism section 20 is composed of a fixed contact terminal 21 and a movable contact terminal 22, and the fixed contact terminal 21 has a fixed contact 23 fixed by crimping, and a terminal section that bends and projects downward.
24, and press-fitted from the opening 12 of the base 10,
It is fixed.

On the other hand, the movable contact terminal 22 has a movable contact piece on the bent terminal portion 25.
The 26 bases are fixed by spot welding.
The movable contact 28 is fixed by caulking near the tip portion 27 of the movable member 26. Then, the tip 27 of the movable contact terminal 22 is press-fitted and fixed in the opening 13 of the base 10 to move the movable contact 28.
Is opposed to the fixed contact 23 of the fixed contact terminal 21 so that the fixed contact 23 can come into contact with and separate from the fixed contact 23, and the tip portion 27 has an opening 17 provided in the base 10.
Exposed from the bottom (Fig. 2).

The electromagnet portion 30 is formed by winding a coil 35 around a body portion 34 of a spool 33 having collar portions 31 and 32 at both ends, and a through hole 36 for incorporating a drive mechanism portion 40 described later is provided at the center portion of the body portion 34. It is provided.

The flange portion 31 has pedestal portions 37a and 37b integrally provided on both side edges of the outer surface (FIG. 2), and coil terminals 38a and 38b are insert-molded on the pedestal portions 37a and 37b, respectively. The lead wires of the coil 35 drawn out through the cutout grooves 31a and 31b are respectively bent and soldered to the coil terminals 38a and 38b (FIG. 2).

On the other hand, the collar portion 32 has a lower end portion with which a claw portion 39 engageable with the positioning recesses 16a and 16b provided on both side edges of the upper surface of the base 10.
a and 39b are projected downward. Further, the claw portions 39a, 39b
A step portion for fitting a leaf spring of a movable iron piece 42 described later is provided in the vicinity of
32a and 32a are provided.

The contact mechanism unit 40 includes a yoke 41, a movable iron piece 42, and a drive plate 43.

The yoke 41 is bent into a substantially J-shaped cross section, and the bent and raised portion 44 (magnetic pole portion) is formed in the through hole 36 of the spool 33.
It is press-fitted from one side and holds the spool 33.

The movable iron piece 42 is a plate material bent into a substantially L-shaped cross section, and one end portion 45a of a plate spring 45 bent into a substantially V shape is fixed to the outer surface of the horizontal portion 42a by spot welding. The movable iron piece 42 is rotatably supported by inserting the tip of the horizontal portion 42a from the other side of the through hole 36 and fitting the lower end of the vertical portion 42b into the tip portion 41a of the yoke 41. At the same time, the tip of the horizontal portion 42a projects from the through hole 36.
Further, the provisional fixing claw portions 45c, 45c formed at both ends of the wide portion 45b of the leaf spring 45 are inserted into and engaged with the step portions 32a, 32a provided on the inner surfaces of the flange portion 32 facing each other. By doing
The horizontal portion 42a is biased upward, and the claw portion 45c is moved to the step portion 32.
make a surface contact with a.

In addition, the leaf spring 45 is provided with the temporary fixing claw portions 45c, 45c provided on the wide portion 45b.
It is locked in.

The drive plate 43 has a through hole 4 that can be inserted into the tip of the horizontal portion 42a.
7, and a pair of protrusions 48a (the protrusions on the front side in FIG. 1 are not shown) are provided on the inner side surfaces of the through hole 47 facing each other, while the inner side of the through hole 47 is provided. An elastic pressing portion 48b and a pedestal portion 48c are respectively provided on the lower surface so as to project. Then, the horizontal portion 42a of the movable iron piece 42 is press-fitted into the through hole 47, and the cutout portions 46, 46 provided on both side surfaces thereof are fitted into the protrusions 48a, 48a, respectively, and the elastic pressing portion 48b is provided.
By pressing the upper surface of the movable iron piece 42 with, the drive plate 43 is attached to the tip of the horizontal portion 42a of the movable iron piece 42 without rattling.

Then, the electromagnet section 30 incorporating the drive mechanism section 40 is used as a base.
Positioning above 10 and fitting the grooves 33a (grooves on the far side in FIG. 1 not shown) formed between the collar 31 and the pedestals 37a, 37b, respectively, into the barrier 15, and
Position the claws 39a, 39b of the spool 33 on the positioning recess 16 of the base 10.
When the electromagnet portion 30 is fixed to the upper surface of the base 10 by engaging with a and 16b respectively, the lower end portion 43a of the drive plate 43 can press the tip portion 27 of the movable contact piece 26 exposed from the opening 17. (Fig. 2).

On the other hand, since the wide portion 45b of the leaf spring 45 is located between the collar portion 32 of the spool 33 and the locking projection wall 18 of the base 10, the movable iron piece 42 does not fall out.

According to the present embodiment, since the barriers 14 and 15 are provided on the side of the electromagnet portion 30, the creeping distance between the electromagnet portion 30 and the contact mechanism portion 20 becomes long, and the insulation characteristic is improved.

Further, the wide portion 45b of the leaf spring 45 is attached to the step portions 32a, 32a of the spool 33.
After being inserted from one direction and engaged, the leaf spring 45 can be prevented from coming off through the locking projection wall 18 of the base 10 only by positioning and fixing the spool 33 on the upper surface of the base 10. There is an advantage that the leaf spring 45 is not plastically deformed.

The case 50 has a box shape with a gas vent hole 51, and the base 10
Then, the gas is removed from the inside and then sealed.

According to this embodiment, by fitting the case 50 to the base 10, there is an advantage that the fixed contact terminal 21 and the movable contact terminal 22 can be prevented from coming off.

Therefore, when the electromagnet portion 30 is not excited, the leaf spring 45
The tip of the horizontal portion 42a of the movable iron piece 42 is urged upward by the spring force, and the movable contact 28 of the movable contact piece 26 is separated from the fixed contact 23.

Next, when a voltage is applied to the coil 35 to excite the electromagnet portion 30, the horizontal portion 42a of the movable iron piece 42 causes the bending and raising portion 4 of the yoke 41 to bend.
The movable iron piece 42 is attracted to the magnetic pole portion 4 and resists the spring force of the leaf spring 45, and after the movable iron piece 42 rotates about the lower end portion of the vertical portion 42b as a fulcrum, the movable iron piece 42 is attracted to the bent and raised portion 44, and accordingly, is moved. The drive plate 43 descends to push down the tip 27 of the movable contact piece 26, and the movable contact 28 comes into contact with the fixed contact 23.

When the excitation of the electromagnet portion 30 is released, the movable iron piece 42 is restored by the spring force of the leaf spring 45, so that the drive plate 43 is lifted to release the pressing of the movable contact piece 26 and move the movable contact piece 26. The contact 28 separates from the fixed contact 23 and returns to the original state.

(Effect of the Invention) As is apparent from the above description, according to the present invention, after the wide portion provided on the other end of the leaf spring is inserted into the step portion provided on the collar portion of the spool from one direction, By mounting and fixing the spool on the upper surface of the base, the wide portion of the leaf spring is positioned between the step portion provided on the collar portion of the spool and the projecting wall provided on the upper surface of the base, and the movable iron piece is moved. Is locked out.
For this reason, the assembly is not troublesome, the number of assembling steps is not increased, and the productivity is improved.

In particular, when the wide part of the leaf spring is inserted into the step provided on the spool, the wide part elastically deforms in the plate thickness direction,
The temporary fixing claw provided on the wide part does not slip and get caught in the step, so it does not take much time to assemble.
Since the temporarily fixed claws that have slipped in temporarily fix the assembled movable iron piece, the assembling property is further improved.

Further, since the temporary fixing claw portion provided on the wide portion of the leaf spring is inserted into the step portion provided on the spool and is in surface contact, even if the movable iron piece is rotated, the edge portion of the wide portion is There is no scraping of the spool and no resin waste.

Further, since it is not necessary to forcibly bend the wide portion of the leaf spring at the time of mounting, there is an effect that plastic deformation does not occur in the leaf spring and the product yield is improved.

[Brief description of drawings]

1 to 6 show an embodiment of an electromagnetic relay according to the present invention. FIG. 1 is an exploded perspective view, FIGS. 2 and 3 are perspective views from different angles, and FIG. 4 is a plan sectional view. Fig. 5 is a side sectional view, Fig. 6 is a rear sectional view, and Figs.
FIG. 7 shows an embodiment according to a conventional example, FIG. 7 is an exploded perspective view, FIGS. 8 and 9 are perspective views from different angles,
FIG. 10 is a schematic explanatory view, and FIG. 11 is a schematic explanatory view showing another embodiment according to the conventional example. 10 …… Base, 18 …… Projection wall, 20 …… Contact mechanism, 32 ……
Collar part, 32a …… Step part, 33 …… Spool, 34 …… Body part, 35
...... Coil, 36 ...... Through hole, 42 ...... Movable iron piece, 42a ......
Horizontal part, 42b ... Vertical part, 45 ... Leaf spring, 45a ... One end part, 45b ... Wide part, 45 ... Claw part.

Claims (1)

[Scope of utility model registration request] 1. A base, a resin spool on which a coil is wound around a body having a flange at least at one end, and which is mounted and fixed on the upper surface of the base, is bent in a substantially L-shaped cross section, and is horizontal. Part is inserted into a through hole provided in the body part of the spool, and a movable iron piece supported rotatably in the plate thickness direction with a vertical lower end as a fulcrum, and one end bent at a substantially V shape. The movable iron piece, which is fixed to a horizontal portion of the movable iron piece and includes a leaf spring having a wide portion formed at the other end thereof, and is rotated through the leaf spring by exciting and demagnetizing the coil. In the electromagnetic relay that drives the contact mechanism section, among the long side edge portions of the wide portion of the leaf spring, while provisionally provided with the temporarily fixing claw portions at both ends of the movable iron piece side edge portion, on the collar portion of the spool, Surface contact by inserting the temporary fixing claw provided in the wide part of the leaf spring An electromagnetic relay, wherein a step portion that can be formed is provided, and a projecting wall that can prevent a wide portion of the leaf spring inserted into the step portion from coming off is provided on the upper surface of the base.