JPH0427077Y2 - - Google Patents

Description

[Detailed explanation of the idea] 〔Technical field〕 This invention relates to an electromagnetic relay.

[Background technology]

If the movable part of an electromagnetic relay is designed to rotate, and a shaft is fitted on one end of the movable part and a card serving as a contact drive part is installed on the other end, the upper and lower parts of the movable part will be rotated. Tatsuki was big. Furthermore, if this backlash was made smaller, the movable parts could become immobile when force was applied to the relay cover or when the cover was bent after being molded.

[Purpose of invention]

In view of the above, the purpose of this invention is to provide an electromagnetic relay in which the movable part moves smoothly.

[Disclosure of invention]

In order to achieve the above object, this invention includes a movable part on a body that moves forward and backward around an axis by the action of an electromagnet to drive a contact mechanism, and this body is covered with a cover. In the electromagnetic relay in which forward and reverse movement of the movable part is performed along opposing surfaces of the body and cover, the body includes walls supporting opposing surfaces of the cover on both sides of the movable part, A small protrusion is provided on at least one of the opposing faces of the movable part and the body, a small protrusion is provided on at least one of the opposing faces of the movable part and the cover, and at least one of the opposing faces of the movable part and the body is provided with a small protrusion. The gist of the invention is an electromagnetic relay characterized in that it also includes a convex portion surrounding the shaft.

This invention will be explained in detail below based on drawings showing examples thereof.

FIG. 3 shows an exploded overall configuration of one embodiment of the electromagnetic relay according to this invention. Note that the coil is omitted for convenience of illustration.

FIG. 2 shows an enlarged view of the body and the movable insulator.

As shown in FIG. 3, this electromagnetic relay includes an electromagnetic block 2, contact mechanisms 3, 4,
It is provided with a permanent magnet block 5 and a card 6 as movable parts, and a case-like cover 15 is placed over the body 1. Electromagnetic block 2 is
An iron core 8 is attached to the center of the inner side of a yoke 7 having a U-shape in plan, thereby forming a magnetic path component having an E-shape in plan. The free end 8a of the core becomes the central magnetic pole,
Both ends 7a and 7b of the yoke form opposing magnetic poles that face each other with the central magnetic pole in between. Opposing magnetic pole part 7
a, 7b and the central magnetic pole portion 8a have opposite polarities due to excitation of a coil (not shown). The iron core 8 is located in the center hole 9 of the coil bobbin 9.
a, and both legs of the yoke 7 are also inserted through a collar portion 9b on the fixed end side of the iron core 8 of the coil bobbin 9. This collar portion 9b has a coil terminal 1
0 and 11 are provided, respectively. Both ends of the winding of the coil are connected to the coil terminals 10 and 11, respectively. The body 9c of the coil bobbin 9 includes
The coil is wound. The contact mechanisms 3 and 4 are arranged on the sides of the coil of the electromagnetic block 2, and each fixed contact 31, 41 and each fixed contact 3
1 and 41, and movable contacts 32 and 42 that can be opened and closed. The fixed contacts 31 and 41 are carried by fixed contact terminals 33 and 43, respectively. The movable contacts 32, 42 are carried by one end of a movable spring 34, 44, respectively, and the other end of the movable spring 34, 44 is
They are carried by movable contact terminals 35 and 45, respectively. Fixed contact terminals 33, 43 and movable contact terminals 35, 45 are supported by body 1, respectively.

As shown in FIGS. 2 and 3, the permanent magnet block 5 has a planar U-shape in which two magnetic pieces 12 and 12' sandwich a permanent magnet 13 from both ends in the direction of magnetization. It is attached to one end of the body 14. In the permanent magnet block 5, the ends of the two magnetic pieces 12, 12' on the same side are
It is combined with the electromagnetic block 2 so as to be inserted into the gap formed between the opposing magnetic pole parts 7a, 7b of the electromagnetic block 2 and the central magnetic pole part 8a. Both wing parts of the movable insulator 14 are cards 6, 6, and the other end of the movable insulator 14 has a hole 1 that serves as a bearing.
4a is provided. The cards 6 and 6 have grooves (not shown) that sandwich the movable springs 34 and 44, respectively, and sandwich the movable springs 34 and 44 therebetween.

As shown in Figures 2 and 3, body 1
is equipped with a tunnel 1a extending in the longitudinal direction at the center of the upper surface. The tunnel 1a is formed of an insulating wall 1b that is integrally formed with the body 1 by molding or the like. Of course, by covering the electromagnetic block with an insulating wall made separately and integrating it with the body,
It may look like a tunnel. Further, the tunnel may be open at a portion that does not face the contact mechanism, such as the top surface. The tunnel 1a widens at one longitudinal end of the body 1 (the front side in the figure) and opens toward the front, but at the other longitudinal end, the top surface is open, and the end surface and side surface are covered with an insulating wall. 1b continues in a frame shape. The insulating wall 1b has a shaft 1c, which serves as a rotational axis of the movable insulator 14, on the upper surface of the center of one end in the longitudinal direction of the body 1, and a bearing hole 14a of the movable insulator 14 is fitted into this shaft 1c. ing. The electromagnet block 2 is inserted into the tunnel 1a from the facing magnetic pole parts 7a, 7b and the central magnetic pole part 8a side, so that the facing magnetic pole parts 7a, 7b and the central magnetic pole part 8a face below the upper opening of the tunnel 1a, and the coil is inserted into the tunnel 1a. The coil bobbin 9 is housed in the tunnel 1a so that the coil bobbin 9 completely enters into the tunnel 1a and the collar 9b of the coil bobbin 9 fits into the widening part of one end of the tunnel 1a. If the insulating wall forming the tunnel and the body are made integrally as in this example, the number of parts can be reduced, and the electromagnetic block can be positioned in the body by simply inserting the electromagnetic block through the tunnel opening. Since it is fixed in place, it does not require manufacturing man-hours. A permanent magnet block 5 is placed on the top of the tunnel-shaped insulating wall 1b, and two magnetic pieces 12, 12' attached to one end of the movable insulator 14 and a permanent magnet 13 are inserted from the top opening of the tunnel 1a. and is combined with the electromagnetic block 2 as described above. A case-shaped cover 15 is placed over the body 1 so as to cover the relay components. 16 is a two-winding latching coil terminal used as necessary.

FIG. 1a shows a partial cross section of the electromagnetic relay of this embodiment when viewed from the side. FIG. 1b shows a partial cross section of this relay when viewed from the front.

As shown in Figure 1b, Figures 2 and 3,
The body 1 is provided with walls 1d, 1d that support opposing surfaces of a cover 15 on both sides of a permanent magnet block 5, which is a movable part, on a tunnel-shaped insulating wall 1b. These walls 1d, 1d are formed integrally with the insulating wall 1b, but of course they may be formed separately and integrated. Movable insulator 1 of permanent magnet block 5
4 is surrounded by the opposing surfaces of the body 1 and the cover 15 and the walls 1d, 1d. Since the surface of the cover 15 facing the body 1 is supported by the walls 1d, 1d, even if the cover 15 is pushed from the outside, the surface facing the cover 15 will not bend inward and will remain firm. The surface spacing H is stable. Further, even if the cover 15 is bent inward after molding, when assembled, the opposing surfaces of the cover 15 are pushed from the inside by the walls 1d, 1d, and the opposing surface distance H is made to a desired size, making it stable. . In this way, when the distance between the facing surfaces of the body and the cover is stable, the movable part is not pushed by the cover, and the movement becomes smooth. Therefore, the electromagnetic relay according to this invention can be an electromagnetic relay with excellent operating characteristics.

In the electromagnetic relay according to this invention, a small protrusion may be provided on at least one of the facing surfaces of the movable part and the body. For example, in the above embodiment, as shown in FIGS. 1 to 3, the body 1 has a tunnel 1 on the top surface (opposite surface of the body 1) of the tunnel-shaped insulating wall 1b.
(a) Two small protrusions 1e, 1e are provided on the upper surface opening side. In this way, the movable part and the body come into contact with each other at the tips of the small protrusions, reducing the contact area. Therefore, the friction between the movable part and the body is reduced, and the movement of the movable part becomes smoother. Furthermore, rattling of the movable part (movement in opposing directions between opposing surfaces of the body and the cover) can also be reduced. Of course, the number of small protrusions may be any number as long as it is one or more, but if there are too many, the effect may be lost.

In the electromagnetic relay according to this invention, when the movable part is designed to rotate forward and backward around the axis,
A convex portion surrounding the axis may be provided on at least one of the facing surfaces of the movable portion and the body. for example,
In the above embodiment, as shown in FIGS. 1 to 3,
A permanent magnet block 5 is attached to the shaft 1 on the opposite surface of the body 1.
It is provided with a convex portion 14b surrounding c. In this way, the movable part can rotate more smoothly and rattling can be reduced, as in the case where the small protrusion described above is provided. When a protrusion is provided in this way, if the shaft is placed at one end of the movable part, if the aforementioned small protrusion is also provided at the other end of the movable part, rotation of the movable part will be prevented. It becomes smoother and also reduces rattling.

In the electromagnetic relay according to this invention, if the movable part is designed to rotate forward and backward around the axis,
As shown in FIGS. 1 to 3, the shaft 1c has a conical surface A whose diameter gradually increases toward the shaft mounting surface, and the bearing 14a has a conical surface A that matches the conical surface A. If it has a surface B and the conical surface B is placed on the conical surface A (which may be reversed), the shaft 1c and the bearing 14a will come into close contact with the conical surface A and the conical surface B. In this way, axis 1
The friction between the permanent magnet block 5 and the bearing 14a can be reduced, and the permanent magnet block 5, which is a movable part, can be prevented from wobbling as if floating. Therefore, the operation of the permanent magnet block 5 becomes smoother.

The electromagnetic relay according to this invention whose movable part rotates forward and backward around an axis is
By using the above-mentioned structure or the structure described later, the effect will be exhibited only when the relay is made into a completed product. However, during the assembly process before putting the cover on, there is a problem that the movable part may shake or come off the axis. Therefore, as shown in Fig. 4a, after making the length of the shaft 1c longer than the thickness of the bearing hole 14a and inserting the shaft 1c into the bearing hole 14a, as shown in Fig. 4b, heat caulking is performed. By crushing the tip 1c' of the shaft 1c by means such as, the bearing hole 14a
It is better to make the diameter larger than the diameter of the In this way, the movable part will not come off the shaft 1c during the assembly process, eliminating any troubles during the process. Furthermore, by using the above-mentioned structure in combination, it is possible to stabilize the movable part from the assembly stage to the usage stage after the product is completed. Note that if the tip end 1c' of the shaft 1c protrudes outside the bearing hole 14a, problems such as extra space will arise. Therefore, as shown in Fig. 4c, the diameter of the mating portion (indentation) 14a' of the shaft 1c tip 1c' of the bearing hole 14a is made larger than the other portions, and the shaft tip is placed inside this depression 14a'. The diameter of the portion 1c' is made larger than the other portions by heat caulking or the like. In this way, the heat-bonded portion of the shaft tip portion 1c' is accommodated in the recess 14a', and no extra space is taken up, making it possible to make the device more compact and still achieve the above-mentioned effects.

In the electromagnetic relay according to this invention, in addition to the above-mentioned small protrusions and convex parts, at least one of the facing surfaces of the movable part and the cover is also provided with a small protrusion.
Even if the opposing surfaces of the movable part and the cover come close together due to looseness in the movable part, the tip of the small protrusion makes contact, so the movable part moves more smoothly and there is less looseness in the movable part. becomes smaller. In the above embodiment, as shown in FIGS. 1 to 3, the permanent magnet block 5 has a bearing hole 1 on the surface facing the cover 15.
Two small protrusions 14 on the end opposite to the side with 4a
c, 14c, and the above-mentioned effects are obtained. Of course, the number of small protrusions may be one or more, but if there are too many, the effect may be lost.

The operation of this electromagnetic relay having the above configuration will be explained using a latching type as an example. In a state where no current is passed through the coil, the permanent magnet block 5 is such that, for example, the magnetic piece 12 is connected to the opposing magnetic pole portion 7a.
The magnetic pieces 12' are each attracted to the central magnetic pole portion 8a by the magnetic flux of the permanent magnet 13.
At this time, the movable contact 32 is closed to the fixed contact 31, and the movable contact 42 is separated from the fixed contact 41. Now, when current is passed through the coils and the opposing magnetic pole parts 7a and 7b are excited to the north pole and the central magnetic pole part 8a is excited to the south pole, the permanent magnet block 5 moves around the axis 1c due to the repulsion of the same polarity and the attraction of the different polarity. 1 and the cover 15, the magnetic material piece 12 and the magnetic material piece 12' abut against the central magnetic pole part 8a and the opposing magnetic pole part 7b, respectively. This movement is transmitted to the contact mechanisms 3 and 4 by the card 6, and the movable contact 32 is transferred to the fixed contact 3.
1, and the movable contact 42 closes to the fixed contact 41. Even if the excitation of the coil is stopped, the permanent magnet 13
This state is maintained by the magnetic flux. In this state, if a current is passed through the coil and excitation is performed with the opposite polarity, the permanent magnet block 5 will be activated in the same way.
rotates smoothly in opposite directions about the shaft 1c along the facing surfaces of the body 1 and the cover 15, and the magnetic piece 1
2 abuts on the opposing magnetic pole part 7a, and the magnetic piece 12' abuts on the central magnetic pole part 8a, respectively. This movement card 6
is transmitted to the contact mechanisms 3 and 4, and the movable contact 32
is closed to the fixed contact 31, and the movable contact 42 is opened from the fixed contact 41. Even if you stop energizing the coil,
This state is maintained by the magnetic flux of the permanent magnet 13.

In the electromagnetic relay according to this invention, as in the above embodiment, the electromagnetic block is covered with a tunnel-shaped insulating wall of the body, and the contact mechanism is arranged outside the tunnel on the side of the coil. The creepage distance between the contact mechanism (input section) and the contact mechanism (output section) is increased, the withstand voltage between the input and output can be increased, and the structure can be made smaller. If it is a polarized relay, it can be made smaller. Furthermore, the contact capacity can also be increased. Overall,
Since it can be constructed in a small size, the magnetic attraction force is small and the sensitivity is high. A polarized relay will have higher sensitivity. Since the body has a tunnel structure, it is strong and the upper part can be used for attaching parts (e.g. permanent magnet block), and it also prevents changes in characteristics due to distortion of parts (e.g. yoke). It can be suppressed. Note that the tunnel-shaped insulating wall also serves as a partition between the coil and the contact mechanism, and also serves to prevent harmful gases from the coil portion from affecting the contact.

The electromagnetic relay according to this invention is not limited to the above embodiments. For example, the movable part may be other than a permanent magnet block, such as an iron core or an electromagnetic block. The electromagnetic block has one end of the iron core as a central magnetic pole, a yoke connected to the other end of the iron core and extending along the iron core, and the tips of the yoke split into left and right parts, rising up and forming opposing magnetic poles facing each other with the central magnetic pole in between. It may be a thing or it may be something else. The forward and reverse movement of the permanent magnet block may be parallel movement. The number of contact mechanisms is not limited to two,
One or more may be used. Of course, the contacts can be appropriately selected from A contacts, B contacts, C contacts, etc., and can be combined in various ways. The shape of the body also varies. The shapes of the cards also vary.

The electromagnetic relay according to this invention can be formed as either a latching type or a single stable type. Further, it is also possible that the movable part and the fixed part which attract each other come into contact with each other through a permanent gap (a gap and/or a magnetic shield).

[Effect of idea]

As seen above, in the electromagnetic relay according to this invention, the movable part moves forward and backward along the facing surfaces of the body and the cover, and the body has a movable part on both sides of the movable part, Since the cover is provided with a supporting wall, the facing surface of the cover remains firm even when pushed from the outside, and the distance between the facing surfaces of the body and the cover is stable. Furthermore, a small protrusion is provided on at least one of the facing surfaces of the movable part and the body,
A small protrusion is also provided on at least one of the opposing surfaces of the movable portion and the cover, and a convex portion surrounding the shaft is provided on at least one of the opposing surfaces of the movable portion and the body. Therefore, in the electromagnetic relay according to this invention, the movable part moves smoothly.

[Brief explanation of the drawing]

Figure 1a is a partial cross-sectional view from the side showing the essential parts of one embodiment of this invention, Figure 1b
2 is a partial cross-sectional view of the same as seen from the front, FIG. 2 is an enlarged perspective view of a part of the movable part and the body used in the embodiment, and FIG. 3 is the overall configuration of the embodiment. , an exploded perspective view with the coil omitted, FIGS. 4a and 4b are partial cross-sectional views seen from the side showing the main parts of another embodiment being assembled, and FIG. 4c is a still another embodiment. FIG. 2 is a partial cross-sectional view of the main part of the vehicle as seen from the side. 1...Body, 1c...Shaft, 1c'...Shaft tip, 1d...Wall that supports the opposing surface of the cover, 1e...
...Small protrusion, 2...Electromagnetic block, 3, 4...Contact mechanism, 5...Permanent magnet block as a moving part, 1
4a...Bearing hole, 14b...Protrusion surrounding the shaft, 14
c... small protrusion, 15... cover, A... conical surface of shaft, B... conical surface of bearing hole.

Claims (1)

[Claims for Utility Model Registration] (1) A movable part is provided on the body that moves forward and backward around an axis by the action of an electromagnet to drive a contact mechanism, and this body is covered with a cover,
In the electromagnetic relay in which forward and reverse movement of the movable part is performed along opposing surfaces of the body and cover, the body includes walls supporting opposing surfaces of the cover on both sides of the movable part,
A small protrusion is provided on at least one of the opposing faces of the movable part and the body, a small protrusion is provided on at least one of the opposing faces of the movable part and the cover, and at least one of the opposing faces of the movable part and the body is provided with a small protrusion. An electromagnetic relay further comprising a convex portion surrounding the shaft. (2) The shaft has a conical surface whose diameter gradually increases toward the shaft mounting surface, and the bearing fitted to the shaft has a conical surface that matches the conical surface. The electromagnetic relay according to claim 1, wherein one of these conical surfaces is placed on the other. (3) The electromagnetic relay according to claim 1 or 2, wherein the tip of the shaft is larger than the diameter of the bearing. (4) The electromagnetic relay according to claim 3 of the utility model registration, wherein the bearing is formed with a recess for accommodating the large diameter portion at the tip of the shaft.