JPS6139331A - Polarized relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to a polarized relay used for example on a printed circuit board, and more specifically to a polarized relay used for example in a printed circuit board. This invention relates to a polarized relay that switches contacts by driving a movable contact piece via a movable iron piece corresponding to the .

(b) Prior art and its problems The general structure of the above-mentioned polarized relay is as shown in the exploded view in Fig. 1 and the assembled drawings in Figs. 2, 3, and 4. In order to clarify the technical issues, we will first explain them.

The iron core 2 is insert-molded into the spool 3, and spacers 2a and 2b are attached to protrusions from both ends of the spool 3, and the electromagnetic coil 1 is wound around the outer periphery of the spool 3. The yoke 4 is for forming a magnetic circuit over the iron core 2, and is attached to the lower side of the electromagnetic coil 1. The yoke 4 has a substantially square shape with left and right standing walls 4a and 4b, and the left and right standing walls 4a and 4b are positioned to sandwich the iron core 2. Moreover, between the left and right vertical walls 4a and 4b of the yoke 4,
A pair of movable iron pieces 5, 5 positioned sandwiching the iron core 2, a permanent magnet 6 interposed between both rotating pieces 5, and these parts 5.
, 5.degree. 6 is interposed, which holds the movable contact piece 8.8 between them.

Then, the electromagnetic coil 1 is energized or de-energized, and the electromagnetic coil 1 is energized or de-energized to cause a magnetic pole change in the iron core 2, and the movable iron piece 5.5, which is magnetized by the permanent magnet 6, and the iron core 2. Which magnetic repulsion or attraction force drives the holding member 7, and the movable contact piece 8 switches the contacts 9 and 10.

Further, the above-mentioned components 1 to 10 are mounted on a relay base 11 and covered with a case 12, and the relay base 11 has a terminal assembly A1. A2. B1. B2
゜CI and C2 are installed.

FIG. 5 shows the attraction curve in the magnetic circuit of such an electromagnetic relay, and in this figure, the broken line represents the load curve. Note that the load curve shows the state when the movable contact fixed to the tip of the movable contact piece 8 is located at the center between the fixed contacts 9 and 10.

In a magnetic circuit with such an attraction curve and the above configuration, in order to obtain operating characteristics (operating voltage, return voltage) that allow self-reset, the load system must be changed from a bistable state to a monostable state. There must be. That is, the suction force and load conditions shown in FIG. 6 must be maintained (see the state at 0%). For this reason, conventionally, after the movable contact piece 8 is assembled into the relay base 11, the movable contact piece 8 is deformed.
- Adjustments were made by making slight deformations many times in order to maintain a stable state and keep the operating voltage and return voltage within specifications. This method was unsuitable for mass production because it required extremely complicated adjustment work for each individual electromagnetic relay produced.

In order to avoid this, it is possible to deform the movable contact piece 8 in advance and incorporate it, but the base 8a of the movable contact piece 8
When assembling the terminal assemblies CI and C2 that support the terminals A1 and C2 using an automatic assembly machine, the terminal assemblies A1. A2. Since Bl and B2 are already attached, it is impossible to insert the terminal assemblies CI and C2 from directly above the relay base 11.

It was also considered to pre-bend the terminal assemblies CI and C2 from the initial stage to m=J to match the suction force.
Due to variations in the plate thickness and hardness of the assemblies, the assemblies do not bend evenly, resulting in a considerable amount of effort and time being spent on adjustment after assembly.

(c) Purpose of the invention The purpose of the present invention is to provide a polarized relay that eliminates the above-mentioned drawbacks by matching the attraction force characteristics to the load system instead of matching the load system to the attraction characteristics as in the past. do.

(D) Summary of the Invention Therefore, the present invention has been devised to provide a substantially U-shaped yoke for forming a magnetic circuit across the iron core, in which the contact magnetic pole area between the iron piece and the surface facing across the iron core is different on the right and left sides. It is characterized by being a polar relay.

(E) Effects of the Invention In the present invention, by making the magnetic pole areas in contact with the yoke and the iron piece different on the right and left sides, the attractive force characteristics are matched on one side of the load system, that is, the movable contact. This eliminates the need for bending the movable contact piece, which is required to match the load system to the attraction force characteristics. Therefore, once a polarized relay is assembled, the relay becomes stable at that stage, and there is no need to bend or adjust the movable contact piece as in the past, and the individual relays that are manufactured are unnecessary. Maintain operating characteristics with adjustments.

In addition, when inserting and press-fitting the terminal assembly by automatic assembly, the movable contact piece is not bent in any way, so there is no problem and no special consideration is required. Variations in the position of the contact piece in the contact portion are reduced, and the width of deviation from the total value of the load curve is also kept small. Furthermore, the yoke shape remains symmetrical about the central axis even if the magnetic pole area is changed, so there is no directionality when inserting the yoke, making it suitable for automatic assembly.

In this way, the present invention can be easily assembled automatically, and has a simple structure in which the magnetic pole areas in contact with the yoke and the iron piece are different on the right and left sides, so that the load curve in the assembled state is stabilized. Since the adjustment rate is reduced, it is suitable for mass production, and as a result, an inexpensive polarized relay can be provided.

(F) Description of the Embodiment FIG. 7 shows the yoke 13 used as the first embodiment. - Left and right vertical walls 13a facing each other with the iron core 2 in between.

13b, one of the standing wall portions 13a is removed to make the shapes of the left and right standing wall portions 13a, 13b asymmetrical, thereby making the left and right magnetic pole areas different, and changing the magnetic pole area to change the attractive force characteristics. so that it matches the load curve (■) in Figure 6.

In this way, if the attraction force characteristics are made to match the load curve ■ by changing the magnetic pole area of the yoke 13 (increase/decrease in 1 & flux), the task of matching the load system to the attraction force characteristics, that is, the movement of the movable contact piece. No need to put your hands into it.

FIG. 8 shows a yoke 13 used as a second embodiment, in which one standing wall portion 13a is cut away leaving a small portion in the width direction so that the left and right standing walls 81113a, 13b have asymmetrical shapes.

FIG. 9 shows the yoke 13 and the movable iron piece 5 in the third embodiment.
5, by cutting out a part of one standing wall section 13a to make the shapes of the left and right standing wall sections 13a and 13b asymmetrical, thereby making the left and right magnetic pole areas different, and changing the attractive force characteristics to the load curve shown in Fig. 6. Make sure that it matches.

FIG. 10 shows the yoke 13 and the movable piece 5 in the fourth embodiment.
Contrary to FIG. 9, one of the movable iron pieces 5 is partially cut out to make the shapes of the left and right movable iron pieces 5.5 asymmetrical.

FIG. 11 shows the yoke 13 and the movable iron piece 5 in the fifth embodiment.
, 5, and remove a part of one movable iron piece 5,
That is, one movable iron piece 5 is made smaller than the other movable iron piece 5.

[Brief explanation of the drawing]

1 to 5 are for explaining a conventional polarized relay, where FIG. 1 is an exploded perspective view and FIG. 2 is an exploded perspective view. 3 and 4 are a cutaway plan view, side view, and front view of the case, and FIG. 5 is a graph showing a suction curve and a load curve. 6 to 11 are for explaining the polarized relay according to the present invention. FIG. 6 is a graph showing a suction curve and a load curve, and FIGS. 7 and 8 are graphs showing the first embodiment and FIG. Perspective views of the yoke used in the second embodiment, Fig. 9, Fig. 1G, Fig. 1
Figure 1 shows the third embodiment. FIG. 7 is a front view showing the relationship between the yoke and the movable iron piece in the fourth embodiment and the fifth embodiment. 5... Movable iron piece, 6... Permanent magnet, 13... Yoke, 13a, 13b... Vertical wall portion. . Patent applicant: Tateishi Electric Co., Ltd. Agent
Two patent attorneys, Aohaku Aohaha, 115, and Fig. 7.

Claims (1)

[Claims] (1) A movable block equipped with an electromagnet with protruding magnetic pole surfaces of an iron core at both ends of a spool wound with a coil, a pair of iron pieces that can attract and repel the magnetic pole surfaces at both ends of the iron core, and reciprocating movement of this movable block. A polarized relay consisting of a contact mechanism that opens and closes a contact in conjunction with the iron core, a substantially U-shaped yoke for forming a magnetic circuit across the iron core,
This polarized relay is characterized in that the contact magnetic pole area between the opposing surfaces of the iron core at both ends of the yoke and the iron piece is different on the right and left sides.