JPH02273431A - Solenoid relay - Google Patents

Abstract

PURPOSE:To increase a return voltage without requiring special arrangement and without being accompanied by component deformation by interposing a non-magnetic thin plate between contact surfaces of an armature and an operation piece. CONSTITUTION:An operation piece 22 of an insulation material is fit over the shank of an armature 17 by the engagement between a projection 27 of the operation piece 22 and a hole 26 of the armature 17. A non-magnetic thin plate 28 with its hole 29 penetrated with the projection 27 is interposed between contact surfaces of the two components. The operation piece 22 is contacted with a movable contact point spring. Make and break between a movable contact point and a fixed contact point are performed according to the action of the armature 17 caused by turning on and off of a current applied to an exciter coil (not shown). The presence of the non-magnetic thin plate 28 produces a gap between the contact surfaces, reduces a retention force, and increases return voltage. Fitting of the non-magnetic thin plate 28 is made by simple sandwiching without requiring securing means such as welding or the like.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a small electromagnetic relay mounted on a printed wiring board.

[Conventional technology]

Many electromagnetic relays mounted on printed wiring boards are dedicated to DC operation, but electromagnetic relays for DC operation have a problem in that the return voltage is low because the electromagnet has a strong holding force when the armature is attracted. As a countermeasure against this problem, it is known to provide a gap between the electromagnet and the armature's armature. Conventionally, therefore, a non-magnetic metal plate was spot welded to the iron core or armature, or a thick copper plating was applied as a base plating for the iron core and armature.

[Problem to be solved by the invention]

However, the method of spot welding non-magnetic metal plates requires spot welding equipment, and since non-magnetic metal plates are thin, they have the disadvantage of being deformed by the heat generated during spot welding. On the other hand, the method of increasing the thickness of the copper plating has the disadvantage that the number of plating steps increases and that the iron core and armature are deformed during the plating process. An object of the present invention is to provide an electromagnetic relay that does not require special equipment and has an increased return voltage without causing deformation of parts.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an electromagnetic relay in which an insulating actuating piece that contacts a movable contact spring is fitted near the armature's armature that is attracted to an electromagnet. A non-magnetic thin plate covering the armature surface is sandwiched between them.

[For use]

Even when the magnet is attracted to an electromagnet, a gap is created on the armature surface due to the non-magnetic thin plate, reducing the holding force and increasing the return voltage. Since the non-magnetic thin plate is sandwiched and held between the armadure and the actuating piece, there is no need for sub-I welding or plating.

【Example】

Hereinafter, the present invention will be explained in detail based on FIGS. 1 and 2. Here, No. 111 (A) is an exploded perspective view of the armature, FIG.
FIG. 2 is an exploded perspective view of an electromagnetic relay using the armature shown in FIG. 1. First, in FIG. 2, 1 is a board made of molded resin, and this board 1 has a fixed contact spring 3 having a fixed contact 2.
, and a movable contact spring 5 having a movable contact 4 is fixed. 6 and 7 are contact terminals integrated with the fixed contact spring 3 and the movable contact spring 5, respectively. Although not clearly shown in the figure, 8 is a gate-shaped iron core punched out of a steel plate, and its leg tips 8a and 8b are press-fitted into mounting holes 9 and 10 of the board 1, respectively, and supported by the board 1''. . An excitation coil 2 wound around a winding frame 11 made of molded resin is press-fitted into the body of the portal core 8. Both ends of the winding of the excitation coil 12 are connected to coil terminals 3 and 14 fixed to the winding frame 11, respectively. When the portal core 8 is attached to the substrate 1, the coil terminals 13 and 14 are inserted into holes 15 and 16, respectively, made in the substrate 1, and their tips protrude from the bottom surface of the substrate 1. 17 is an armature punched out of a steel plate in the shape of a reverse gate, as shown in the figure, so as to bridge both legs of the gate-shaped iron core 8.
It is arranged along the side surface of the portal core 1. Armature 1
7 has a support shaft 18 at the lower end thereof inserted into a bearing hole 19 of the substrate 1, and is supported by the substrate 1 so as to be able to freely rotate around the support shaft 18. At that time, the leg piece 20 at the bottom of the other end is connected to the square hole 20 of the board 1.
The armature 17 is fitted through a gap so that the rotation range of the armature 17 is restricted. An actuation piece 22 made of an insulator is elastically fitted into the body of the armature 17. This actuating piece 22 has an armature 17 connected to the base plate 1.
The movable contact spring 5 comes into contact with the back surface of the movable contact spring 5 while being supported by the movable contact spring 5. The case 23 is fitted onto the board 1 to which the portal core 8 and the armature 17 are attached, and is fixed by engagement between the grooves 24 of the two hooks on both sides of the board 1 and the corresponding protrusions 23a of the case 23. Ru. In such a configuration, when a DC excitation current is applied to the excitation coil 12, the armature 17 pivots about the support shaft 18 and is attracted to the portal core 8. At this time, the movable contact spring 5 is pushed through the operating piece 22 to close the contacts 2 and 4. When the excitation coil 12 is de-energized, the armature 17 returns to the illustrated state due to the spring force of the movable contact spring 5. FIG. 1 shows the above-mentioned team 1 and 1 in detail. In FIG. 1, the actuating piece 22 has a U-shaped cross section so as to hold the armature 17 on both side walls, and a pair of protrusions 25 that engage with the back surface of the armature 17 are formed at the tips of both side walls. . Furthermore, a cylindrical protrusion 27 that is tightly inserted into a hole 26 of the armature 17 is formed on the surface of the actuating piece 22 facing the armature 17 . Now, a non-magnetic thin plate 2B is sandwiched between the armature 17 and the actuating piece 22. The non-magnetic Tm plate 28 is made of a non-magnetic metal plate, has a width almost the same as the body of the armature 17, and has a hole 29 through which the protrusion 27 of the actuating piece 22 is inserted tightly. As shown in FIGS. 1(I3) and (C), the non-magnetic thin plate 28 is sandwiched between the actuating piece 22 and the armature 17, with its tip touching the polarized surface 17a of the armature 17. It is designed to be covered. Therefore, when the armature 17 is attracted to the portal core 8 as described above, there is a gap between the portal core 8 and the polarized surface 17a of the armature 17 that corresponds to the thickness of the non-magnetic thin plate 28. A gap is created, the holding force of the electromagnet decreases, and the return voltage increases. The non-magnetic thin plate 28 is positioned by fitting the protrusion 27 and the hole 29, and is held between the armature 17 and the actuating piece 22. The non-magnetic thin plate 28 does not require welding or other fixing means to attach, and can be easily fixed by simply being inserted during assembly work.

【Effect of the invention】

According to this invention, by holding a non-magnetic thin plate between the armature and the actuating piece, the return voltage is increased with a simple configuration, spot welding equipment is not required, and the number of plating steps is reduced. I can do it.

[Brief explanation of drawings]

1(A) is an exploded perspective view of the armature 1A, and FIG. 1(B) is a perspective view of the armature in FIG. 1(A) in an assembled state seen from the opposite side. Figure, Figure 1 (
C) is a sectional view taken along line CC in FIG. 1(B), and FIG. 2 is an exploded perspective view of an electromagnetic relay using the armature shown in FIG. 1. 5... Movable contact spring, 17... Armature, 22
... Operating piece, 2B... Non-magnetic thin plate.

Claims (1)

[Claims] 1) In an electromagnetic relay in which an actuating piece of insulating material that contacts a movable contact spring is fitted near the armature's armature surface that is attracted by an electromagnet, a non-magnetic thin plate is placed between the armature and the actuating piece and covers the armature surface. An electromagnetic relay characterized by sandwiching.