JPS6112328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electromagnetic relay, more specifically, a hollow part is provided in the body of the spool, a reed piece (movable piece) is passed through this hollow part, and the base of the reed piece is made of a magnetic material, such as a permanent magnet. This relates to an electromagnetic relay in which both sides of this permanent magnet are held by one end of a yoke, and the other end of the yoke is opposed between the tips of the lead pieces to form a contact part. be.

In this type of electromagnetic relay, one of the problems in terms of operating characteristics is unevenness of the lead pieces. In other words, the reed piece is held from both sides by permanent magnets, but if there is a gap between the permanent magnet and the reed piece due to manufacturing errors, the base of the reed piece will be attracted to one of the permanent magnets. . Therefore, there is a drawback that the lead piece, which should originally be in the neutral position, is fixed in an inclined or biased state, resulting in unbalanced operating characteristics.

The present invention has been made in view of the above drawbacks, and its object is to provide an electromagnetic relay with stable operating characteristics by positioning the base of the lead piece.

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 one wall part 6a
A vertical groove 9a is provided at the center of the inner surface of the holder, and a substantially prismatic connecting portion 10 (see FIG. 5) 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 lower portions of 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 the side end of the base 17 is connected to the wall 6a. The projecting piece 18 provided at the lower end of the base is connected to the terminal 11 by spot welding (see FIG. 7). Therefore, the lead piece 16 is accurately positioned between the width part 4a of the groove part 4 and the groove 9a of the wall part 6a.

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. Furthermore, a quadrangular prism-shaped convex portion 28 having the same width as the connecting portion 10 of the first spool 1 is protruded from the outer surface of one of the flange portions 23b. The second spool 20 is attached to the first spool 1 with the lead piece 16 in between.
A coil 31 is wound around the body parts 2 and 21. At this time, the winding beginning portion 32a of the coil 31
are first connected to the terminal 13, and the auxiliary winding parts 5a,
After being wound several times with 26a, the coil introduction part 25a
The end portion 32b of the coil 31 is connected to the terminal 14 after being wound several times in the auxiliary winding portions 5b, 26b via the coil introducing 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.

34a and 34b are electrically conductive and magnetic yokes whose tips 35a and 35b are fitted with a contact material such as silver, which are press-fitted between the walls 6a and 6b of the first spool, and whose lower surfaces are connected to the walls 6a and 6b. Step portion 7a of 6b,
7b, and the tips 35a and 35b contact the contact portion 37 with the tip 16a of the lead piece 16 facing each other.
It consists of That is, the contact portion 37 connects the tips 35a and 35b of the yoke, the lower surface of the convex portion 28, and the connecting portion 10.
The upper surface and the inner surface of the wall portion 6b are almost sealed, and the distance between the contacts (the distance between the tips 35a and 35b of the yoke)
is accurately determined by the width of the convex portion 28 and the connecting portion 10. Note that a protrusion 36b protruding from the lower surface of the yoke 34b is connected to the terminal 12 by spot welding.

Reference numerals 40 and 41 denote permanent magnets made of a magnetic material having electrical insulation properties, such as ferrite, and these permanent magnets are connected to 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. iron 34
a and the other end of 34b.
It is inserted with the pole and south pole facing in the same direction. For example, if the permanent magnet 40 is inserted first, its magnetic force will attract the upper part of the base 17 of the lead piece 16 (the protruding piece 18 at the lower part of the base 17 is welded to the terminal 11), and the above recess will be permanently attached. The reed piece 16 may be tilted by the clearance between the reed piece 16 and the magnet 40, or the entire reed piece 16 may be deviated upward in FIG. However, the base 1 of the lead piece 16
Since the lead piece 7 is positioned by engaging with the groove 9a on the inner surface of the wall portion 6a, there is no fear that the lead piece 16 will tilt or deviate.

44 and 45 are the collar portions 23a of the second spool 20;
A synthetic resin for primary sealing is filled between 23b and walls 6a and 6b, and has a relatively high viscosity (for example, 30 poise) when filled. The resin 44 filled between the flange 23a and the wall 6a covers the upper surfaces of the permanent magnets 40, 41 and the auxiliary windings 5a, 26a.
It flows into the inside of the coil 31 through the communication hole provided on the joint surface of both the spools 1 and 20, and solidifies. On the other hand, the resin 45 filled between the flange 23b and the wall 6b is filled with the yoke 34a,
It flows into the upper surface of 34b and inside the auxiliary winding parts 5a, 26b, completely sealing the surroundings of the contact part 37, and the winding of the coil 31 through the communication hole provided in the joint surface of both spools 1, 20 in the same way as above. It flows into the interior and solidifies (see Figure 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 31 of the first spool 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 36a on the lower surface of the yoke 34a 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 37, are connected to the filled resin 4.
4 and 45, there is no fear that the epoxy resin will enter the contact portion 37 during low-pressure molding, and the filled resin 44 and 45 will slightly flow into the coil winding portion, causing both spools 1 and 20 to be sealed.
Since the joint between the body parts 2 and 21 is sealed, the gap between the coil 31 and the collar parts 3a, 3b, 23a, and 23b is also closed, and the epoxy resin flows from the joint between the body parts 2 and 21 into the lead piece 16. Grooves 4, 22 that housed
There is no need to worry about it getting inside. 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 35a or 35b of the yoke due to the magnetic flux of the permanent magnet 40 or 41, and the reed piece 16 and the yoke contact each other. 34a or 34b are electrically connected. Now, as shown in Figures 4 and 5,
The magnetic flux of the permanent magnet 40 causes the tip 3 of the yoke 34b to
5b and the tip 16a of the reed piece 16, the tip 16a of the reed piece 16 is in contact with the tip 35b of the yoke 34b, which causes a current to flow through the coil 31 to excite the magnetic flux in the opposite direction to the magnetic flux of the permanent magnet 40. Repulsed,
The magnetic flux of the permanent magnet 41 causes the tip 3 of the yoke 34a to
5a, the tip 16a of the reed piece 16 comes into contact with the tip 35a of the yoke 34a, and the lead piece 16 and the yoke 34a 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.

FIG. 8 shows another embodiment of the present invention, in which a small projecting piece 19 is provided on the base 17 of the lead piece 16,
A lead piece 16 is attached to the upper end of the wall 6a of the first spool 1.
A groove 9b having a width approximately equal to the plate thickness is provided, and the small protruding piece 19 is inserted into the groove 9b to form the base 17 of the lead piece 16.
is positioned. In this case, as in the previous embodiment, the reed piece 16 is connected to the permanent magnet 40,
41 will not tilt or deviate when inserted.

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 40 and 41, and instead of one of the permanent magnets, a magnetic material having 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.

Furthermore, it goes without saying that the electromagnetic relay of the present invention is not limited to the sealed type as in the above embodiments.

As is clear from the above description, according to the present invention, the base of the lead piece and the groove provided in the wall of the spool are engaged to position the lead piece.
There is no inclination or deviation of the lead pieces when the magnetic material is inserted, and an electromagnetic relay with stable operating characteristics can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an electromagnetic relay according to the present invention, Fig. 2 is a front view, Fig. 3 is a plan view, Fig. 4 is a cross-sectional view taken along the line - - of Fig. 2, and Fig. 5 is a ―
Line sectional view, Figure 6 is a - line sectional view of Figure 3,
FIG. 7 is a sectional view taken along the line -- in FIG. 3, and FIG. 8 is a partial perspective view of another embodiment. 1...first spool, 2...body, 3a, 3b
...Flame part, 4...Groove part, 6a, 6b...Wall part, 9
a, 9b... Groove, 11, 12, 13, 14... Terminal, 16... Lead piece, 17... Base, 19...
Small protruding piece, 20...second spool, 21...body,
22... Groove portion, 23a, 23b... Flange portion, 31...
...Coil, 34a, 34b...Yoke, 35a, 3
5b...Tip, 37...Contact part, 40, 41...
Permanent magnet (magnetic material), 50...lead frame,
51-56...Lead terminals.

Claims (1)

[Claims] 1 A vertically divided abbreviation with a groove that is open at both ends.
A first spool having a 1/2-shaped body and a flange and a wall on the outside of the flange, and a second spool having a body and a flange that are combined with the body and flange of the first spool. 2 spools, a lead piece inserted between the grooves of the two spools, the base of which is inserted between the wall and the collar of the first spool, and wound around both parts of the two spools. a coil and a magnetic material having electrical insulation properties inserted between the collar and wall of both spools so as to sandwich the base of the lead piece;
a yoke having one end abutting the outer surface of the magnetic body and the other end facing the tip of the reed piece to form a contact portion; the reed piece is attached to the wall of the first spool; An electromagnetic relay characterized in that a groove having a width approximately equal to the thickness of the plate is provided, and a part of the base of the lead piece is engaged with the groove.