JPH0729554Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a hinge-type electromagnetic relay in which a movable iron piece supported by a hinge is provided so as to be swingable by excitation and non-excitation of an electromagnet block.

(Prior Art) In this type of electromagnetic relay, it is necessary to stabilize the operating characteristics and improve the contact reliability so that the electromagnetic relay operates reliably at a constant operating voltage. Therefore, conventionally, for example, FIG.
As shown in FIG. 8, a structure that stabilizes the movable iron piece in the returned state is adopted.

As shown in FIG. 6, the electromagnet block 60 is attached to a base 61 with its yoke 62 facing upward, and as shown in FIG.
The movable iron piece 64 is hinge-supported and the coil spring 66 is supported by engaging the notch portions 65a, 65b formed at both ends of the movable iron piece 64 with the protruding pieces 63a, 63b provided on both sides of the tip of the yoke 62. A contact mechanism is constituted by a movable contact piece 67 fixed to the movable iron piece 64 and a fixed contact terminal 68 fixed to the base 61 while being biased to the return side. In this structure, a stopper terminal 68a, which serves as a receiving portion for the movable contact piece 67 when returning, is fixed to the base 61. Instead of the stopper terminal 68a, as shown by a two-dot chain line in FIGS. 6 and 7, a stopper 68b that abuts when the movable iron piece 64 returns may be provided on the base 61 so as to project.

In the structure shown in FIG. 8, an electromagnet block 60 substantially the same as that shown in FIG. 6 is attached to a base 61 so that its yoke 62 stands, and as shown in FIG. The bent movable iron piece 69 is placed so that the inner surface of the bent portion contacts the tip corner portion 62a of the yoke 62, and the hinge spring 70 fixed to the yoke 62 presses the bent outer surface of the movable iron piece 69. The hinge supports the movable iron piece 69, while the base
A fixed contact terminal 71 and a movable contact piece 72 are erected on 61 to form a contact mechanism, and a card 73 is provided between the movable contact piece 72 and the movable iron piece 69.
Is interposed. In this one, the movable contact piece 72
The stopper terminal 71a, which is the receiving part when the
It is projected on 1. Incidentally, instead of the stopper terminal 71a, as shown by a two-dot chain line in FIG.
In some cases, the base 61 is provided with a stopper 71b that abuts when the wheel returns.

(Problems to be solved by the invention) However, as shown in FIG. 6 and FIG. 8, the stopper terminals 68a, 71a receive the movable contact pieces 67, 72 at the time of restoration, and the stopper terminals 68a, 71a are fixed. It must be fixed to the base 61 with a structure similar to that of the contact terminals 68, 71.
There was a problem that the assemblability was poor and the cost was high.

Further, as shown by the chain double-dashed line in FIG. 6, in the case where the movable iron piece 64 is received by the stopper 68b integral with the base 61, the metal and the molding resin locally collide with each other, so that abrasion powder is generated due to frequent movements. However, there is a problem that the contact reliability of the contact is lowered. Therefore, it is conceivable to form the receiving portion into a surface or a linear shape so as to receive the entire back surface of the movable iron piece 64 entirely or to receive it linearly in the longitudinal direction. However, there is a problem that the molding is difficult because there are problems such as the release taper and the direction of the release.

Further, as shown by the chain double-dashed line in FIG.
Even if the stopper 71b is used to receive the above, similarly to the above, there are problems such as generation of abrasion powder and difficulty in molding.

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 mold, does not generate abrasion powder, has stable operation characteristics, and has high contact reliability.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a movable iron piece having a hinge supporting shaft near the upper surface of the base and parallel to the base surface by exciting or de-exciting an electromagnet block. In an electromagnetic relay that operates and returns to drive the contact mechanism, a base is provided with a receiving portion having an inclined surface at the same angle as the return angle of the movable iron piece, and the back surface of the movable iron piece when returned is It is formed so as to be able to contact the entire inclined surface of the receiving portion.

(Operation) According to the above configuration, when returning, the inclined surface of the receiving portion receives the back surface of the movable iron piece entirely or linearly in the longitudinal direction.

(Embodiment) 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. The electromagnetic relay generally includes a base 1, an electromagnet block 2,
It is composed of a movable iron piece 3, a contact mechanism 4, and a card 5.

As shown in FIG. 1, the base 1 is divided into an electromagnet side on the left side and a contact side on the right side in FIG. 1 by an insulating wall 10 standing upright at a position slightly closer to the end than 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 an electromagnet block 2 to be described later is embedded, and at a position adjacent to the recess 11 and near the base of the insulating wall 10, insulation is provided. A groove-shaped hinge hole 12 is formed along the wall 10. When the yoke 23 is embedded in the recess 11, the hinge hole 12 is designed such that the front end surface of the yoke 23 forms one wall surface thereof as shown in FIGS. 3 and 4.

In the center longitudinal direction of the side wall surface of the electromagnet of the insulating wall 10, as shown in FIG.
A stopper 13 having a is projected. The inclined end surface 13a of the stopper 13 is inclined with respect to the base 1 at the same angle as the movable iron piece 3 at the time of returning. Because of this inclination, there is no need to provide a die release taper for forming the portion of the inclined end surface 13a at the time of resin molding, so that molding is easy. Further, the stopper 13 serves as an insulating wall 10 during resin molding.
Are reinforced to prevent the insulating wall 10 from falling down due to molding.

On the other hand, on the contact side of the base 1, as shown in FIGS. 2 and 3, a contact stopper 14 for preventing the fixed contact terminals 41a and 41b, which will be described later, from tilting toward the opposite sides is provided upright. There is. Also, the contact insulating wall 15 is formed in a direction perpendicular to the insulating wall 10.
The contact insulation wall 15 secures an insulation distance between the movable contact piece 43 and the fixed contact terminals 41a and 41b.
In addition, locking claws 16a and 16b for fixing a case (not shown) are provided on both end surfaces of the base 1 so as to project.

As shown in FIG. 1, in the electromagnet block 2, an iron core 22 is inserted into a spool 21 around which a coil 20 is wound, and a substantially L-shaped yoke 23 is caulked and fixed to one end of the iron core 22. As shown, the tip end surface of the yoke 23 and the magnetic pole surface 22a of the iron core 22 are formed on the same plane. This electromagnet block 2
Coil terminals 24a and 24b are provided by insert molding on one flange portion of the spool 21. Also spool
Protrusions 25a and 25b (the other one is not shown) that cover the hinge hole 12 are provided on both sides of the lower end of the other flange portion of 21 to prevent horizontal deflection of the card 5 described later at the upper end. A projecting piece 26 for doing so is provided.

The movable iron piece 3, as shown in FIG.
Projecting portions 30a, 30b are provided at both ends of the lower end, and a pair of locking claws 31a, 31b for locking with the engaging portions 50a, 50b of the card 5 described later are formed at the upper end. A contact surface 32 is provided so as to project from a surface facing the iron core 22.

The contact mechanism 4 includes a fixed contact terminal 41a having a fixed contact 40a.
And a fixed contact terminal 41b having a fixed contact 40b, and a movable contact
And a movable contact piece 43 having 42. The 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 has a fixed contact 40.
It is urged toward the fixed contact terminal 41a so as to come into pressure contact with a. Further, as shown in FIG. 1, notches 44a and 44b which engage with engaging portions 51a and 51b of the card 5 described later are formed at both ends of the upper end of the movable contact piece 43.

The card 5 is a plate having a substantially C shape in a plan view, and has engaging portions 50a, 50b at both ends thereof with which the locking claws 31a, 31b of the movable iron piece 3 are locked.
And engaging portions 51a and 51b that engage with the cutout portions 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 yoke 23 of the base 1 is pressed while the coil terminals 24a and 24b of the electromagnet block 2 are press-fitted into the base 1. It is buried in the recess 11. As a result, as shown in FIG. 3, the tip end surface of the yoke 23 forms one wall surface of the hinge hole 12, and at the same time, the protrusions 25a and 25b of the spool 21 cover the protrusions 30a and 30b of the movable iron piece 3 from above. As a result, the protrusions 30a and 30b are formed by the hinge hole 12 and the protrusions 25a and 25b.
Surrounded by two faces and supported by a hinge. Therefore, the movable iron piece 3 is assembled so as to be swingable around the protruding portions 30a and 30b.

Next, after the fixed contact terminals 41a, 41b and the movable contact piece 43 are press-fitted into the base 1 at predetermined positions, the card 5 is placed above the contact mechanism 4 and movable contact with the engaging portions 51a, 51b. The engaging claws 31a, 3 of the movable iron piece 3 are engaged with the engaging portions 50a, 50b by engaging the notch portions 44a, 44b of the piece 43 and opening both ends thereof.
Lock 1b. As a result, the movable iron piece 3 becomes the card 5
It is connected to the movable contact piece 43 through the stopper 13 as shown in FIG. 3 by the urging force of the movable contact piece 43.
Is urged in a direction in which it comes into pressure contact with the inclined end surface 13a.

Then, by covering a case not shown, the locking claw 16 of the base 1
After engaging with a and 16b, a sealant is appropriately applied to seal.

When the electromagnetic relay assembled as described above is not excited, the movable contact piece 43 biased to the left in FIG. 3 causes
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 is inclined and returned to the stopper 13 side. Here, since the stopper 13 linearly receives the back surface of the movable iron piece 3 in the longitudinal direction (vertical direction) by its inclined end surface 13a, the movable iron piece 3 is in a stable state.

In this state, when the coil 20 is energized and the electromagnet block 2 is excited, the movable iron piece 3 is attracted to the magnetic pole surface 22a of the iron core 22 and rotates clockwise around the protrusions 30a and 30b in FIG. Then, as a result of pulling the movable contact piece 43 rightward in the figure against the biasing force through the card 5, the movable contact 42 separates from the fixed contact 40a and closes to the fixed contact 40b, and the contact is switched. To be

During this operation, the insulation wall 10 ensures a sufficient insulation distance between the electromagnet side and the contact side, so that the withstand voltage characteristic is improved.

When the coil 20 is de-energized, the electromagnet block 2
Then, the movable contact piece 43 is returned to the left in FIG. 3 by the urging force of the movable contact piece 43, and at the same time, the movable iron piece 3 is rotated counterclockwise about the projecting portions 30a and 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, a local collision does not occur, abrasion 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.

Incidentally, in the above-mentioned embodiment, the stopper provided on the insulating wall 10 is projected.
Although the inclined end surface 13a of 13 is a receiving portion that receives the back surface of the movable iron piece 3, the entire surface of the insulating wall 10 may be an inclined surface, and the inclined surface may entirely receive the back surface of the movable iron piece 3. This further prevents the generation of wear debris.

(Effect of the Invention) As is apparent from the above description, according to the present invention, the back surface of the movable iron piece in the returning state is received by the receiving portion entirely or linearly in the longitudinal direction. The movable iron piece is stable, the generation of abrasion powder is suppressed, and the operating characteristics and contact reliability are improved. Further, since the receiving portion is formed by the inclined surface, there is an effect that it is not necessary to consider a draft taper or the like at the time of molding and the molding is easy.

[Brief description of drawings]

1, 2, and 3 are exploded perspective views, plan views, and front views, respectively, of the electromagnetic relay according to the present invention, FIG. 4 is a right half sectional view of FIG. 3, and FIG. The left side view of the figure, FIG. 6 is a front view of a conventional electromagnetic relay, FIG. 7 is an exploded perspective view of a hinge portion of a movable iron piece shown in FIG. 6, and FIG. 8 is a front view of another conventional electromagnetic relay. 9 is a perspective view of a hinge portion of the movable iron piece shown in FIG. 1 ... Base, 2 ... Electromagnetic block, 3 ... Movable iron piece, 4 ... Contact mechanism, 13 ... Stopper (receiving part), 13
…… Inclined end faces (inclined faces), 30a, 30b …… Projections (hinge spindles).

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic system in which a movable iron piece near a top surface of a base and having a hinge support shaft parallel to the base surface is operated and restored by excitation or non-excitation of an electromagnet block to drive a contact mechanism. In the relay, the base is provided with a receiving portion having an inclined surface having the same inclination angle as the return angle of the movable iron piece, and the rear surface of the movable iron piece at the time of return is formed so as to be able to contact the entire inclined surface of the receiving portion. Electromagnetic relay characterized by the following.