JPH073566Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnetic relay.

(Prior Art) Conventionally, as an electromagnetic relay, for example, FIGS.
As shown in the figure, roughly, the base 10 and the contact mechanism parts 20, 20
, Electromagnet section 30, shield cover 40, movable block
Some consist of 50 and 60.

The base 10 has a recess 11 in the center of the upper surface, and contact mechanism parts 20, 20 and ground terminals 18, 19 to be described later are arranged on opposite side edge parts, respectively.

The contact mechanism section 20 includes a common terminal 21 and a movable contact piece 22 having one end fixed to the common terminal 21 and a movable contact 23 provided at a free end.
And fixed contact terminals 26 and 27 respectively having fixed contacts 24 and 25 facing each other with the movable contact 23 interposed therebetween so as to be able to come into contact with and separate from each other.

The electromagnet portion 30 has the coil 35 wound around the body portion 34 of the spool 33 having the flange portions 31 and 32 at both ends, and the iron core 36 is inserted into the through hole 34a provided in the body portion 34 so as to project. And the other protruding end 36b is fixed to the rear rising piece 38a of the yoke 38 by caulking to be integrated with the magnetic pole 36a.

The spool 33 is a pedestal portion provided on both sides of the collar portion 31.
Coil terminals 37, 37 are insert-molded in 31a, 31b, respectively, while guide recesses 32a, 32b for supporting a movable block 50 described later in a reciprocating manner are provided in the flange 32.

Further, the yoke 38 has a pair of front standing pieces 38b, 38c facing each other with the magnetic pole portion 36a of the iron core 36 in between.

The shield cover 40 is bent in a substantially U-shaped cross section, has a bent tongue 41 at one end, and a pair of connecting ears 42, 4 protruding laterally with the tongue 41 interposed therebetween.
Three are provided. Then, the shield cover 40 is put on the coil 35 wound around the electromagnet section 30, and then the tongue piece 41 is inserted.
Is spot-welded to the end portion 36b of the iron core 36, so that they are fixedly integrated.

Then, the electromagnet section 30 in which the shield cover 40 is integrally fixed
Is press-fitted and fixed in the recess 11 of the base 10 and is assembled by soldering the connecting ears 42, 43 of the shield cover 40 to the ground terminals 18, 19 respectively (FIG. 4).

The movable block 50 is a pair of movable iron pieces holding a permanent magnet 51.
52, 53 are press-fitted into one body, and slits 5 for inserting the movable contact pieces 22, 22 into the arm portions 54, 55 extending from both sides.
It has 6,57.

Then, the movable block 50 positions the arms 54 and 55 in the guide recesses 32a and 32b of the spool 33, respectively, and inserts the movable contact pieces 22 and 22 into the slits 56 and 57, respectively. The movable contact pieces 52, 53 are supported so as to be able to reciprocate in the directions of arrows m, n in the figure, and the movable contact pieces 52, 53 face the magnetic pole portion 36a of the iron core 36 alternately so that they can come in contact with and separate from each other.

In the non-excited state, the magnetic force of the permanent magnet 51 causes the movable block 50 to move in the direction of arrow n in FIG. 3, and the movable contact 23 is in contact with the fixed contact 24.

When the coil 35 is excited to cancel the magnetic flux of the permanent magnet 51, the movable iron pieces 52 and 53 repel the front standing piece 38b and the magnetic pole portion 36a, respectively, while being attracted to the magnetic pole portion 36a and the front standing piece 38c, respectively. The movable block 50 moves in the direction of arrow m, and the movable contact 23 switches from the fixed contact 24 to the fixed contact 25. Even if the excitation is released, due to the magnetic force of the permanent magnet 51,
That state is retained.

Next, when a voltage is applied to the coil 35 in the opposite direction to the above, the movable block 50 returns in the direction of the arrow n, switching the contacts and returning to the original state.

(Problems to be solved by the invention) However, in the electromagnetic relay according to the conventional example,
Since the connecting ears 42, 43 of the shield cover 40 are respectively connected to the pair of ground terminals 18, 19 provided on the base 10, the shield cover 40 and the separate ground terminals 18, 19 are required. As a result, the number of parts and the number of assembling steps are increased, and the production cost is high.

The present invention has been made in view of the above problems, and an object thereof is to provide an electromagnetic relay having a small number of parts and a small number of assembly steps.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention is to fix an end portion of an iron core around which a coil is wound and to connect a shield cover to a yoke provided on an upper surface of a base. In the relay, a part of the yoke is projected as a ground terminal.

Therefore, according to the present invention, a part of the yoke provided on the base can also be used as the ground terminal.

Therefore, since a separate ground terminal is not required, the number of parts and the number of assembling steps are reduced, and the production cost is reduced.

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

The electromagnetic relay according to the present embodiment is almost the same as the above-mentioned conventional example, except that the central portion of the yoke 38 is cut and raised downward to form the ground terminal 38d.

Then, by pressing the ground terminal 38d of the yoke 38 into an insertion hole (not shown) provided in the recess 11 of the base 10,
The yoke 38 is fixed to the base 10.

The shield cover 40 is connected to the ground terminal 38d of the yoke 38 via the end 36b of the iron core 36 obtained by spot welding the tongue piece 41.
It is connected to the.

According to this embodiment, a part of the yoke 38 can also be used as the ground terminal, so that it is not necessary to separately provide the ground terminal, and the number of parts is reduced.

Moreover, the shield cover 40 is connected to the yoke via the iron core 36 of the electromagnet portion 30 obtained by spot welding the tongue piece 41 of the shield cover 40.
Since it is connected to the earth terminal 38d of 38, the connection work as in the conventional example becomes unnecessary. Therefore, there is an advantage that the number of working steps is reduced and the productivity is improved.

Others are the same as the above-mentioned conventional example, and therefore the description is omitted.

In the above embodiment, the case where the central portion of the yoke is cut and raised to form the ground terminal has been described, but the present invention is not limited to this, and the edge portion of the yoke may be cut and raised to form the ground terminal, or Alternatively, the yoke may be subjected to protrusion processing to form the ground terminal. Further, if the ground terminal formed of the yoke is arranged on the same straight line as the other terminals, there is an advantage that connection work becomes easy. Furthermore, as a method of fixing the yoke to the base,
Of course, not only the method of press-fitting but also fixing by insert molding may be used.

[Brief description of drawings]

1 and 2 show an embodiment of an electromagnetic relay according to the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a plan sectional view, and FIGS. 3 and 4 are electromagnetic waves according to a conventional example. FIG. 3 is an exploded perspective view and FIG. 4 is a plan sectional view showing an embodiment of a relay. 10 ... Base, 38 ... Yoke, 38d ... Ground terminal, 35 ... Coil, 36 ... Iron core, 36a ... End, 40 ... Shield cover.

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic relay in which one end of an iron core around which a coil is wound is fixed and a yoke connected to a shield cover is provided on an upper surface of a base, and a part of the yoke is projected as a ground terminal. Electromagnetic relay characterized by the following.