JPS6120984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed electromagnetic relay.

Conventionally, in order to seal an electromagnetic relay, the method was to cover the terminal block with a case and fill the gap with epoxy resin to seal it. The disadvantage is that miniaturization is impaired because of the covering, and the manufacturing process is complicated and expensive. In particular, it has been difficult to use conventional sealing methods for dip-type electromagnetic relays because the terminals have a special lead-out method.

Therefore, for example, it is possible to form the outer shape and seal the body at the same time by low-pressure molding the main body of the drive part of an electromagnetic relay. In electromagnetic relays in which the reed piece (movable piece) is housed inside the body, low-pressure molded resin may enter the body through the gap between the coil and the spool flange, through the joint between the upper and lower spools. However, there is a risk that the lead piece may malfunction.

The present invention has been made in view of the above problems, and
An object of the present invention is to provide a sealed electromagnetic relay in which resin formed by low-pressure molding is prevented from entering the interior of the body by wrapping a primary sealing material around the joint between the upper and lower spools.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

In the drawing, reference numeral 1 denotes a first spool integrally molded from synthetic resin, which has a 1/2-shaped body 2 and flanges 3a, 3b in the center, and auxiliary winding parts 5a, 5b on the outer surface of the flanges. , with large walls 6 at both ends.
a, 6b. And the flange portion 3a,
Cut grooves 9a and 9b are provided on the upper surface of the winding member 3b near the body portion 2, and a substantially prismatic connecting portion 10 is provided between the auxiliary winding portion 5b and the wall portion 6b. Furthermore, terminals 11, 12, 13, and 14 are insert-molded in the wall portions 6a and 6b so as to protrude to both sides.

Reference numeral 16 denotes a lead piece made of conductive and magnetic metal, which is inserted from above into the groove 4 provided in the body 2 of the first spool 1, and whose base 17 is attached to the wall of the first spool 1. A projecting piece 18 at the lower end of the base is inserted between the portion 6a and the auxiliary winding portion 5a and is connected to the terminal 11 by spot welding.

Reference numeral 20 designates a 1/2-shaped second spool that is integrally molded from synthetic resin and is vertically integrated with the body, collar, and auxiliary winding portion of the first spool 1, and the body 21 has a groove 22. However, on the outer surfaces of the flanges 23a, 23b, auxiliary winding portions 26a, 26b constituted by the outer peripheral surfaces of two rod-shaped protrusions are provided on the outer surfaces of the flanges 23a, 23b.
The upper surface has recesses 24a and 24b and a coil introduction part 2.
5a and a coil lead-out portion 25b are respectively provided. Further, notches 27a and 27b are provided on both sides of the lower surfaces of the flanges 23a and 23b, and one of the flanges 23a and 23b is provided with cutouts 27a and 27b.
3b has a connecting portion 1 of the first spool 1 on the outer surface thereof.
A rectangular prism-shaped protrusion 28 having the same width as 0 is provided in a protruding manner. The second spool 20 is placed on the first spool 1 with the lead piece 16 in between, and the body parts 2, 21
A coil 31 is wound around. At this time, coil 3
The first winding part 32a of the coil 31 is first connected to the terminal 13, wound several times with the auxiliary winding parts 5a and 26a, and then wound around the body parts 2 and 21 via the coil introduction part 25a. The winding end portion 32b is connected to the terminal 14 after being wound several times by the auxiliary winding portions 5b and 26b via the coil lead-out portion 25b. By providing the auxiliary winding section as described above, it becomes possible to continuously wind the coil around a large number of spools, which is extremely efficient.

Reference numerals 34 and 35 denote permanent magnets made of a magnetic material having electrical insulation properties, such as ferrite, and these permanent magnets are formed between the wall portion 6a and the auxiliary winding portions 5a and 26a so as to sandwich the base portion 17 of the lead piece 16. Between N
It is press-fitted with the pole and south pole facing in the same direction.

37a and 37b are electrically conductive and magnetic yokes with contact materials such as silver attached to tips 38a and 38b, which are press-fitted between the walls 6a and 6b of the first spool 1, and their lower surfaces are connected to the wall 6a. , 6b step 7
a, 7b, and clamps the permanent magnets 34, 35 on the inner surface of one end, and the tip 38 of the other end.
A and 38b form a contact portion 42 with the tip 16a of the lead piece 16 facing each other. That is,
Notch 40a on the top surface of the other end of yoke 37a, 37b,
40b clamps the convex portion 28 of the second spool 20,
The notches 41a and 41b on the lower surface are positioned by clamping the connecting portion 10 of the first spool 1. Therefore, the contact portion 42 is substantially sealed by the tips 38a and 38b of the yoke, the lower surface of the convex portion 28, the connecting portion 10, and the inner surface of the wall portion 6b, and the distance between the contacts (the tip 38 of the yoke
a, 38b) is accurately determined by the convex portion 28 and the connecting portion 10. Note that a protrusion 39b protruding from the lower surface of the yoke 37b is connected to the terminal 12 by spot welding.

44 and 45 are the collar portions 23a of the second spool 20;
It is a synthetic resin for primary sealing that is filled and solidified between the 23b and the walls 6a and 6b, and has a relatively high viscosity (for example, 30 poise) when filled. The resin 44 filled between the collar portion 23a and the wall portion 6a covers the upper surfaces of the permanent magnets 34, 35 and the auxiliary winding portion 5.
a, 26a, and further a groove 9a and a notch 27a provided on the joint surface of both spools 1, 20.
It flows into the winding part of the coil 31 from the communication part made up of and solidifies. On the other hand, the resin 45 filled between the flange 23b and the wall 6b is filled with the yoke 37a,
It flows into the upper surface of 37b and inside the auxiliary winding parts 5b, 26b, completely sealing the periphery of the contact part 42, and the notch 9b and notch 27b provided in the joint surface of both spools 1, 20 in the same manner as above. It flows into the winding part of the coil 31 from the communicating part and solidifies (see FIG. 4).

Reference numeral 47 denotes a shield plate bent into a substantially U-shape, which is fitted from the side into the recess 8 on the outer surface of the wall 6a of the first spool 1, and is inserted between the lower surface of the flange 3a of the first spool 1 and the second spool 20. The concave portions 24a, 24b on the upper surface of the flange portions 23a, 23b are sandwiched from above and below.

The drive unit main body assembled as described above is placed on the lead frame 50 punched into a predetermined shape, and the terminal 1 inserted into the first spool 1
1, 12, 13, 14 respectively lead terminals 5
1, 54, 55, and 56, the protrusion 39a on the lower surface of the yoke 37a is connected to the lead terminal 53, and the shield plate 47
The projecting piece 48 is connected to the lead terminal 52 by spot welding. In this state, the main body is molded at low pressure with epoxy resin, as shown by the dashed lines in FIGS. 2 to 6, to completely seal the main body and form the external portion 59. At this time, the movable parts inside the spools 1 and 20, especially the contact parts 42, are filled with the filled resin 45.
Since the primary seal is made by
a, 27b and the kerfs 9a, 9b into the coil winding part, and seals the joint part of the bodies 2, 21 of both spools 1, 20, so that the coil 3
The gaps between the body parts 1 and the collar parts 3a, 3b, 23a, and 23b are also closed, and there is no fear that the epoxy resin will enter the groove parts 4 and 22 in which the lead pieces 16 are housed from the joint parts of the body parts 2 and 21. After the above-mentioned low-pressure molding, the frame portion 57 and connecting portion 58 of the lead frame 50 are cut off to separate the lead terminals 51 to 56, and each lead terminal is bent downward to form the desired sealed electromagnetic relay. .

The sealed electromagnetic relay with the above configuration is a latching type, and in normal conditions, the tip 16a of the reed piece 16 comes into contact with the tip 38a or 38b of the yoke due to the magnetic flux of the permanent magnet 34 or 35, and the reed piece 16 and the yoke contact each other. 37a or 37b are electrically connected. Now, as shown in Figures 4 and 5,
The tip 3 of the yoke 37b is caused by the magnetic flux of the permanent magnet 35.
8b and the tip 16a of the reed piece 16 are in contact with each other, and when a current is applied to the coil 31 to excite it in the direction opposite to the magnetic flux of the permanent magnet 35, the tip 16a of the reed piece 16 contacts the tip 38b of the yoke 37b. Repulsed,
The tip 3 of the yoke 37a is caused by the magnetic flux of the permanent magnet 34.
8a, the tip 16a of the reed piece 16 comes into contact with the tip 38a of the yoke 37a, and the lead piece 16 and the yoke 37a are electrically connected. This state is maintained even if the excitation of the coil 31 is removed, and in order to return to the original state, the coil 31 may be excited in the opposite direction.

Note that the material that holds the base 17 of the lead piece 16 and forms the magnetic circuit is not necessarily limited to the permanent magnets 34 and 35, and instead of one of the permanent magnets, a magnetic material with electrical insulation properties may be used. If used as a body, it can also be used as a single stable type electromagnetic relay that returns when the coil is demagnetized.

Further, as the communication portions, the flanges 3a, 3b, 23a, 2 of both spools 1, 20 as in the above embodiment.
Cut grooves 9a, 9b and notch 27 provided at the joint part of 3b
A, 27b may be replaced with a through hole in the vicinity of the joint of the collar of either one of the spools.

Furthermore, as the primary sealant, a semi-hardened resin may be used instead of the highly viscous liquid resins 44 and 45.

As is clear from the above description, according to the present invention, a communication part is provided near the joint between the collar parts of the two-part spool, and the primary sealing material is introduced into the coil winding part from this communication part. In addition, by surrounding the contact part with the spool wall, flange, and yoke, not only the flange joint of both spools and the contact part are sealed, but also the air gap between the coil winding and the flange is sealed. It is possible to completely prevent the low-pressure molded resin from entering the body from the joint or contact portion of the body. Therefore, there is no fear that the lead piece will malfunction.

Further, since the above-mentioned primary sealing is performed through the communication portion, it can all be performed in one operation, and productivity can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a sealed electromagnetic relay according to the present invention, FIG. 2 is a front view, FIG. 3 is a plan view, FIG. FIG. 6 is a cross-sectional view taken along the line -- in FIG. 3. 1...first spool, 2...body, 3a, 3b
...Flame part, 4...Groove part, 6a, 6b...Wall part, 9
a, 9b...cut groove, 10...connection part, 11,1
2, 13, 14...Insert terminal, 16...Lead piece, 17...Base, 20...Second spool,
21...Body part, 22...Groove part, 23a, 23b...
...Flame portion, 27a, 27b...Notch, 28...Protrusion, 31...Coil, 34, 35...Permanent magnet,
37a, 37b...Yoke, 38a, 38b...Tip, 42...Contact part, 44, 45...Primary sealing material (filling resin), 50...Lead frame, 51-5
6...Lead terminal, 59...Outline part.

Claims (1)

[Scope of Claims] 1. A vertically divided abbreviation having a groove portion open at both ends.
A first spool having a 1/2-shaped body and a flange and walls on both outer side surfaces of the flange, and a body and a flange that are combined with the body and flange of the first spool. The second spool provided, a communication portion provided near the joint of the collar portion of at least one of the spools so as to communicate the coil winding side and the outer surface side, and a communication portion inserted between the two spool grooves. A lead piece, a coil wound around the bodies of both spools, and an electrically insulating material press-fitted between the collars of both spools and one wall so as to sandwich the bases of the lead pieces. a magnetic body, one end of which is in contact with the outer surface of the magnetic body, and the other end of which is press-fitted between the flanges of both spools and the other wall, with the tip of the lead piece facing in between; a yoke constituting a section, and the tip of the reed piece on the side opposite to the magnetic material side is surrounded by the wall section, the flange section, and the yoke,
Filled between the flange and wall of both spools,
The primary sealing material, a portion of which flows into the coil winding side through the communication portion to seal and solidify the body joint of both spools, and the drive unit main body consisting of the spool, coil, lead piece, yoke, etc. A sealed electromagnetic relay comprising an outer shape formed by low-pressure molding around the . 2. The sealed electromagnetic relay according to claim 1, wherein the communicating portion is provided at a joint between the flanges of both spools.