JPS6348374B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small latch relay that can be mounted directly on a printed circuit board, and particularly to a small latch relay that uses permanent magnets to configure an auxiliary magnetic circuit separate from the main magnetic circuit, This relates to a small latch relay that is self-holding.

This type of conventional latch relay uses screws, caulking members, etc. to attach an iron core, a plurality of yoke pieces, or a movable armature to a bobbin around which a coil is wound.

However, with the recent trend toward miniaturization of printed circuit boards, there is a demand for smaller latch relays, whereas conventional latch relays that use screws and caulking members are inevitably subject to design constraints. Therefore, it was not possible to construct a satisfactorily compact latch relay. Furthermore, since mounting members such as screws are used, assembly work cannot be simplified, and therefore it is difficult to reduce costs and sufficiently improve mass productivity.

The purpose of this invention is to eliminate the above-mentioned drawbacks, and to create a compact device that does not use screws or caulking members, and does not require any complicated assembly work that would be required by using such members. It provides a latch relay.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a small latch relay according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view of the main parts of the latch relay.

1 is an iron core with a flange 1a formed at one end;
By being inserted into the hollow hole of the bobbin 2 around which the coil is wound, it constitutes the magnetomotive force generating section of the main magnetic circuit. A flange 3 is fixed to one end of the bobbin 2, and a yoke fixing member 4 is fixed to the other end. 4b, a vertical piece insertion hole 4c of the first yoke piece that constitutes a part of the auxiliary magnetic circuit and the main magnetic circuit, and a vertical piece engagement groove 4d of the second yoke piece that constitutes a part of the main magnetic circuit. and is provided.

The magnet 5 has a disk shape with a diameter substantially the same as the flange portion 3 of the iron core 1, and both surfaces constitute magnetic pole faces of an N pole and an S pole, respectively.

The first yoke piece 6 consists of a vertical piece 6a and a bent piece 6b extending above the vertical piece 6a,
The length of the vertical piece 6a in the lateral direction is approximately the same as the length of the insertion hole 4c of the fixing member 4, and a hole 6c for passing the iron core 1 is bored in the center thereof.

Further, the second yoke piece 7 includes a vertical piece 7a,
It consists of a horizontal piece 7b whose length is approximately the same as that of the bobbin 2, and the horizontal length of the vertical piece 7a is the same as that of the fixing member 4.
The length of the engagement groove 4d is equal to the length of the engagement groove 4d, and a long hole-shaped window hole 7c is provided on the vertical side of the horizontal piece 7b, and small window holes 7d and 7e are provided on both sides of the horizontal piece 7b near the tip. Furthermore, a recess 7f for supporting the movable armature is provided at the tip of the horizontal piece 7b.

The movable armature 8 consists of a horizontal piece 8c to which a pusher 8b for pushing the movable armature, which is made of an insulating material, is fixed to the top surface of its tip, and a vertical piece 8d, and the contact portion of the horizontal piece 8c and the vertical piece 8d is is provided with a projecting piece 8e that is engaged and supported in the recess 7f of the horizontal piece 7b of the second yoke piece 7.

The electromagnetic block A includes the above-described iron core 1, bobbin 2, magnet 5, first yoke piece 6, second yoke piece 7,
It is constructed by assembling each element of the movable armature 8. Assembly is performed centering on the bobbin 2, and first, the fixing member 4 fixed to one end of the bobbin 2 is assembled.
The process starts by inserting the vertical piece 6a of the first yoke piece 6 into the insertion hole 4c. At this initial stage, the hole 6c of the vertical piece 6a matches the hollow hole of the bobbin 2 and the insertion hole 4a of the fixing member 4, but the first yoke piece 6 is not fixed. On the other hand, one magnetic pole surface (N-pole surface) of the magnet 5 is magnetically attached to the surface of the flange portion 1a of the iron core 1, and from the tip of the iron core 1, the insertion hole 4a,
If the whole body is passed through the hollow hole of the bobbin 2 through the hole 6c, the magnet 5 is stored in the storage part 4b and at the same time,
The magnetic force attracts and fixes the yoke piece 6 to the iron core 1. That is, in this state, the magnet 5 and the iron core 1, and the iron core 1 and the first yoke 6 are magnetically attached to each other, so that the horizontal movement of the yoke 6 is restricted by the insertion hole 4c. As a result, the iron core 1 will not come off, and the yoke piece 6 will also be fixed. In other words, each of these elements is temporarily fixed at a fixed position by the magnet 5.

After temporarily fixing the iron core 1 and the first yoke piece 6 as described above, the vertical piece 7a of the second yoke piece 7 is then fixed.
is engaged with the engagement groove 4d. Then, the bent piece 6b of the first yoke piece 6 is connected to the window hole 7c of the second yoke piece 7.
is inserted so that its tip faces the bobbin 2, the upper surface of the horizontal piece 7b of the second yoke piece 7, and the vertical piece 7a and the other magnetic pole face (S pole face) of the magnet 5.
is magnetically attached, and the above-mentioned temporary fixing becomes completely fixed. Note that the horizontal length of the vertical piece 7a is the groove 4d.
Since the length of the groove 4d is equal to the length of the second yoke 7, the second yoke 7 is engaged and fixed to the fixing member 4, whereas the iron core 1 and the first yoke 6 are not completely fixed. This is achieved by the vertical piece 7a of the second yoke piece 7 fixed as described above completely blocking the movement of the iron core 1 in the horizontal direction. Therefore, in order to achieve a completely fixed state, the other magnetic pole face (S pole face) of the magnet 5 when the iron core 1 etc. is temporarily fixed.
Needless to say, there must be no gap between the vertical piece 7a and the inner surface (magnetized surface) of the vertical piece 7a.

In the state where the above assembly is completed, the iron core 1, the first yoke piece 6, and the second yoke piece 7 are magnetized by the magnet 5, so next the movable armature 8
, the protruding piece 8e is inserted into the recess 7f of the second yoke piece 7.
When engaged with and supported by the horizontal piece 7b, the horizontal piece 8
Either the tip of c or the vertical piece 8d,
The support is held in a stable state by adhering to the tip of the first yoke 6 or the tip of the iron core 1 exposed on the outer surface of the flange 3. More specifically, the movable armature 8 is shaped like a letter B, but its bending angle is slightly larger than 90°, and the length of the horizontal piece 8c is such that the protruding piece 8e has a concave portion. The pusher 8b is made long enough to reach the window hole 7c when engaged with the pusher 7f, and the vertical piece 8d is made long enough so that its inner surface faces the tip of the iron core 1 in the same state. There is. Therefore, when the protruding piece 8e is engaged with the recess 7f, the tip of the horizontal piece 8c is connected to the tip of the first yoke piece 6 facing the upper part of the window hole 7c, or the vertical piece 8
d is attracted to the tip of the iron core 1 passing through the bobbin 2, and the movable armature 8 is stably supported by the horizontal piece 7b of the second yoke piece 7 in a state where it is attracted.

As is clear from the above explanation, electromagnetic block A is assembled without using any screws or caulking members.
It can be done extremely easily. Furthermore, since the mounting position of each element is completely specified after assembly, it is possible to mass-produce electromagnetic blocks of uniform quality without requiring high operator skill.

Note that in order to construct a small latch relay based on the electromagnetic block described above, a contact block and a case are separately required.

An outline of this contact block and case will be explained with reference to FIG. The contact terminals 13, 14 and the normally open contact terminals 15, 16 are integrally molded and fixed to the insulating stands 17, 18, and the contact part 1 has a step at the top.
3a, 15a and 14a, 16a, one end of which is fixed to the upper end of the coil terminals 9, 11 and 10, 12, and which is elastically biased downward. 19a, 20
a, its contact portions 13a, 15a and 14a,
It is formed interposed in the stepped portion of 16a. The contact blocks B and C are assembled by disposing them on both sides of the electromagnetic block A, and after assembly, the upper surface of the pusher 8b of the movable armature 8 becomes the lower surface of the movable contact pieces 19 and 20 of each contact block. It is placed in a position opposite to the In addition, in this embodiment, a groove 17 is provided in the longitudinal direction on the inner surface of each block as shown in the figure.
a, 18a horizontally, and the grooves 17a, 18
Projections 17b and 18 are provided on the lower surface side at the upper part of approximately the center of a.
The tongue pieces 17c, 18c having a radius of
At the same time, the protrusions 17b and 18b of the tongue pieces 17c and 18c are inserted into the second Small window hole 7 of yoke piece 7
Since the contact blocks B and C are assembled by fitting and engaging with the electromagnetic block A, there is no need for any screws or the like to attach the contact blocks B and C to the electromagnetic block A.

The case is composed of a container-shaped base 21 and a lid 22, and the lid 22 is engaged after the electromagnetic block A and contact blocks B and C are housed in the base 21. In this case as well, since the engagement is performed by the recesses 22a and 22b provided on the lid 22 and the protrusions 21a and 21b provided on the base 21, there is no need to separately prepare an engagement means. .

Next, the operation of the latch relay according to this embodiment will be explained with reference to FIG.

The magnetic circuit includes a main magnetic circuit consisting of an iron core 1, a magnet 5, a second yoke piece 7, and a movable armature 8;
It is composed of a magnet 5, a first yoke piece 6, a second yoke piece 7, and an auxiliary magnetic circuit consisting of a horizontal piece 8c of a movable armature 8.The main magnetic circuit has a coil wound around the bobbin 2 that is energized. It operates by

Now, if we consider the case where the main magnetic circuit is off and the tip of the horizontal piece 8c of the movable armature 8 is in contact with the tip of the bent piece 6b of the first yoke piece 6, as shown in the figure, The tip of the horizontal piece 7b of the second yoke piece 7 is the S pole, the tip of the iron core 1 is the N pole, and the first yoke piece 6
Since the tip of the bent piece 6b is magnetized to the north pole, the tip of the horizontal piece 8c remains attracted to the tip of the bent piece 6b. Therefore, the pusher 8b is the movable contact piece 19, 20.
contact portions 13a and 14a are in a closed state,
Contact portions 15a and 16a maintain an open state.

If the coil is energized in this state and the direction of the magnetic flux generated in the iron core 1 is made the same as the direction of the magnetic flux of the magnet 5, the tip of the bent piece 6b of the first yoke piece 6 will be Changes to S pole due to magnetic force.
On the other hand, the magnetization state of the movable armature 8 is such that the tip of the horizontal piece 8c is at the S pole due to the auxiliary magnetic circuit, and the tip of the vertical piece 8d is also at the S pole, so there is a repulsive force at the tip of the horizontal piece 8c. acts, and a large suction force acts on the vertical piece 8d. As a result, the movable armature 8 rotates in the direction of arrow P around its supported bent portion, the vertical piece 8d is attracted to the tip of the iron core 1, and the pusher 8b is moved around the movable armature 19, 20 upward against its elastic force. Therefore, the movable contact pieces 19, 20 are separated from the contact portions 13a, 14a, and come into contact with the contact portions 15a, 16a instead. In this way, switching of the contact part is performed,
This state is maintained even if the current supply to the coil is stopped. That is, when the movable armature 8 rotates in the P direction and the energization is stopped with the vertical piece 8d and the tip of the iron core 1 adsorbed, the tip of the bent piece 6b of the first yoke piece 6 changes to the north pole again. Attractive force acts between the horizontal piece 8c and the tip of the horizontal piece 8c, but since the tip of the iron core 1 is magnetized to the north pole and the tip of the vertical piece 8d is magnetized to the south pole, these parts are attracted. This is because the suction force at .

Returning the closed state of the contact portions 15a, 16a to the original open state is achieved by reversing the polarity of the current to the coil. By reversing the polarity of the current to the coil, the tip of the iron core 1 is strongly magnetized to the S pole, and the tip of the bent piece of the first yoke 6 is strongly magnetized to the N pole, and an attractive force acts. A repulsive force acts on the tip of the vertical piece 8d, and a stronger attractive force acts on the tip of the horizontal piece 8c, causing the movable armature 8 to move in the direction opposite to the arrow P around its bent part. This is because it will receive a rotational moment. Then, when the power supply is stopped, the state returns to the initial state (the state shown in FIG. 2), and the closed state of the contact portions 13a and 14a continues to be maintained.

As described above, switching of the contact portion can be performed by changing the direction of the current flowing through the coil, and good self-holding characteristics can be achieved with the current flowing for a very short time.

In the above embodiment, the N-pole surface of the magnet 5 is magnetically attached to the flange 1a of the iron core 1, but the S-pole surface may be magnetically attached, and in that case, the current direction to the coil is changed. By reversing this, it is possible to perform exactly the same operation as described above.

As explained above, according to the present invention, the electromagnetic block can be assembled without using any screws, caulking members, leaf springs, etc., and the bobbin can be assembled by using the magnet that serves as the magnetomotive force source of the auxiliary magnetic circuit. It is extremely easy to press fit into the fixing member that is fixed to the holder, and since no mounting parts such as screws are used, it has the advantage of being lower in price and smaller in size, and inventory management is also easier. It can be done. Therefore, by combining it with a contact block that is relatively easy to downsize, it is possible to provide a latch relay that is more compact at a lower cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a small latch relay according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view of the main parts of the latch relay. 1... Iron core, 1a... Flange, 2... Bobbin, 4
...Yoke fixing member, 4a...Iron core insertion hole, 4
b... Magnet storage part, 4c... Vertical piece insertion hole of first yoke piece, 4d... Vertical piece engagement groove of second yoke piece, 5... Magnet, 6... First yoke piece , 7... second yoke piece, 7c... window hole, 8... movable armature,
19, 20...Movable contact piece.

Claims (1)

[Claims] 1. A bobbin around which a coil is wound, an iron core having a flange formed at one end and inserted into the bobbin, a magnet with one magnetic pole surface magnetically attached to the flange, and a magnet that engages with the flange of the iron core and has a tip end. has a first yoke piece facing the top of the bobbin, a vertical piece magnetically attached to the other magnetic pole surface of the magnet, and a window hole through which the first yoke piece is inserted, and the length is approximately the same as the bobbin. a second yoke consisting of the same horizontal piece, a bent portion supported at the tip of the second yoke, one end facing the other end of the iron core, and the other end facing the tip of the first yoke. It has a movable armature facing the movable armature, and a movable contact piece that opens and closes the contact according to the rotational movement of the movable armature, and one end of the bobbin has an insertion hole for the iron core, a housing portion for the magnet, and a movable contact piece that opens and closes the contact according to the rotational movement of the movable armature. A small latch relay comprising a yoke fixing member having a vertical piece insertion hole of one yoke and a vertical piece engagement groove of the second yoke.