JPH0224197Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to an electromagnetic relay, and more particularly to a balanced armature type electromagnetic relay having a rotating support portion inside a coil bobbin.

(b) Background of the technology There is a desire to create electromagnetic relays with high sensitivity and low power consumption that can be incorporated into various electronic devices. A balanced armature type electromagnetic relay is known as an electromagnetic relay that is efficient and suitable for achieving such high sensitivity and low power consumption. However, conventional balanced armature type electromagnetic relays have problems such as a large number of component parts and their high efficiency is not fully utilized, and various improvements have been attempted to address these problems.

(c) Prior Art and Problems Fig. 1 is a principle diagram of a conventional electromagnetic relay using a four-gap balanced armature system having a rotating support part inside a bobbin, and Fig. 2 is a detailed explanatory diagram.

The rotation support portion 2 of the armature 1 is located inside a coil bobbin 4 around which a coil 3 is wound, and both ends of the armature 1 passing through the coil bobbin 4 are disposed between opposing yokes 6 and 7. When the electromagnetic relay is in the recovery state, one end 1 of the armature 1 is
The end a is attracted to the yoke 6 side, and the other end 1b is attracted to the yoke 7 side for stability. Next, when a current flows through the coil 3 to excite the armature 1 and the electromagnetic relay is in operation, magnetic poles are generated at both ends of the armature 1 that repel the force of the magnet 5, and the armature 1 rotates around the rotation support 2 as a fulcrum. The moving end 1a is attracted to the yoke 7 side, and the other end 1b is attracted to the yoke 6 side and stabilized. A card 8 is inserted into one end 1a of the armature 1, and by turning on and off the current flowing through the coil 3, the card 8 drives a movable contact spring (not shown) to open and close the switch. I do. Furthermore, armature 1
A mechanism 9 is provided at both ends of the yokes 6 and 7 to prevent them from falling off.

In such an electromagnetic relay, the rotation support portion 2 of the armature 1 is located inside the coil bobbin 4, making the structure of the coil bobbin 4 complicated. It is necessary to separately provide a mechanism to prevent the armature 1 from falling off. As shown in FIG. 2, there is a problem in that a gap 10 is formed at the portion where the armature 1 contacts the yokes 6 and 7, reducing the suction force characteristics.

Further, FIG. 3 is a principle diagram of a conventional balanced armature type electromagnetic relay in which a rotation support portion is provided outside the bobbin.

The armature 11 is located inside a coil bobbin 14 around which the coil 3 is wound, one end 11a is disposed between opposing yokes 16 and 17, and the other end 11b is rotated by the yokes 16 and 17. freely held. When the electromagnetic relay is in the restored state, one end 11a of the armature 11 is attracted toward the yoke 16 by the force of the magnet 5, which is located below the coil 3 and is sandwiched between the yokes 6 and 7. When current flows through the coil 3 to excite the armature 11 and the electromagnetic relay is in operation, magnetic poles are generated at both ends of the armature 11 that repel the force of the magnet 5, and the armature 11 rotates about the rotation support portion 11b. However, one end 11a of the armature 11 is attracted to the yoke 17 side. One end 1 of armature 11
A card 8 is inserted into the tip of 1a, and by turning on and off the current flowing through the coil 3, the card 8 drives a movable contact spring (not shown) to open and close the switch.

Although this electromagnetic relay has a reduced number of parts because the yokes 16 and 17 serve as both a rotational support and a fall-off prevention mechanism, it has the disadvantage that it is difficult to construct an efficient four-gap balanced armature system.

(d) Purpose of the invention The purpose of the invention is to provide a four-gear balanced armature type electromagnetic relay that has a small number of component parts, is highly efficient, and is suitable for achieving high sensitivity and low power consumption. The goal is to provide a structure for

(e) Structure of the invention The purpose of this invention is to form a tapered surface on the longitudinal side of the armature so that the width becomes wider toward the center in a balanced armature type electromagnetic relay that has a rotating support part inside the coil bobbin. The armature has a hexagonal shape when viewed from above, and the apex where both tapered surfaces touch is in contact with the inner wall of the bobbin hole to serve as a rotation support part.A drop-prevention step is provided at one end of the armature, and the drop-prevention step and the coil bobbin are connected to each other. This is achieved by an electromagnetic relay characterized in that a card that drives a movable contact spring is inserted between the two.

(f) Examples of the invention Examples of the invention will be explained below with reference to the attached drawings.
Figure 4 is a diagram for explaining the content of the present invention, Figure 5
The figure is a perspective view showing the appearance of the electromagnetic relay according to the present invention.

In Figures 4 and 5, the armature 21
has a hexagonal shape when viewed from above, and the wide part 2 in the center
1c is in contact with the inner wall of the coil bobbin 24 around which the coil 23 is wound to form a rotation support part, thereby configuring a four-gap balanced armature type electromagnetic relay. However, the armature itself has a rotation support part, and there is no need to provide a rotation support part on the coil bobbin or the like.

Armature 21 passing through coil bobbin 24
Both ends 21a and 21b of the magnet are disposed between the opposing yokes 26 and 27, and when the electromagnetic relay is in the recovery state, the magnet located below the coil 23 and sandwiched between the yokes 26 and 27 One end 21a of the armature 21 is attracted to the yoke 26 side and the other end 21b is attracted to the yoke 27 side by the force of the armature 25, so that the armature 21 is stabilized. At this time, the card 2 inserted into the armature 21
8 presses the movable part 31 against the break side fixed contact 32. Next, when a current flows through the coil 23 to excite the armature 21 and the electromagnetic relay is in operation, magnetic poles are generated at both ends of the armature 21 that repel the force of the magnet 25, and the armature 21 rotates around the rotation support part 21c as a fulcrum. One end 21a of the movement is placed on the yoke 27 side, and the other end 21b is placed on the yoke 27 side.
is attracted to the yoke 26 side and becomes stable. At this time, the card 28 presses the movable portion 31 against the make side fixed contact 33.

Since the portion of the armature 21 that contacts the yokes 26 and 27 is tapered, both ends 21a and 21b of the armature 21 are in plane contact with the yokes 26 and 27, and the magnetic resistance at that portion is reduced. This contributes to increasing the efficiency of electromagnetic relays.

Further, one end 21a of the armature 21 is made larger than the hole through which the armature 21 is passed through, which is located at the center of the coil bobbin 24, and a card 28 is inserted between this step 21d and the coil bobbin 24. The portion of the card 28 that contacts the armature 21 is also tapered like the armature 21, and even if the armature 21 tries to pull out toward the end 21a, the card 28 moves together with the armature 21 and is pulled against the yokes 26 and 27. The armature 21 will not fall off because it gets stuck. On the other hand, even if the armature 21 tries to pull out toward the other end 21b, the stage 21d and the coil bobbin 2
Since the card 28 is inserted between the arms 4 and 4, the armature 21 will not fall off. Therefore, there is no need to add any parts to prevent the armature from falling off, which contributes to reducing the number of parts in the electromagnetic relay of the present invention.

(g) Effects of the invention As described above, the invention provides a four-gear balanced amplifier that has a small number of components, is highly efficient, and is suitable for achieving high sensitivity and low power consumption. A structure of a multi-layer electromagnetic relay can be provided.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram of an electromagnetic relay in which a conventional rotation support part is provided inside the bobbin, Fig. 2 is a detailed explanatory diagram, and Fig. 3 is a principle diagram of an electromagnetic relay in which a conventional rotation support part is provided outside the bobbin. FIG. 4 is a diagram for explaining the content of the present invention, and FIG. 5 is a perspective view showing the appearance of the electromagnetic relay according to the present invention. In the figure, 21 is an armature, 21a and 21b are both ends of the armature, 21c is a rotation support part of the armature, 21d is a step provided on the armature, 23 is a coil, 24 is a coil bobbin, 2
5 is a magnet, 26 and 27 are yokes, 28
31 is a movable part, 32 is a break side fixed contact, and 33 is a make side fixed contact.

Claims (1)

[Scope of utility model registration request] In a balanced armature type electromagnetic relay that has a rotating support part inside a coil bobbin, a tapered surface is formed on the longitudinal side of the armature so that the width becomes wider toward the center to form a hexagonal shape in top view. A card whose apex where the surfaces touch is brought into contact with the inner wall of the bobbin hole to serve as a rotation support part, and a drop-prevention step is provided at one end of the armature, and a movable contact spring is driven between the drop-prevention step and the coil bobbin. An electromagnetic relay characterized by being fitted with.