JPH05174686A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay, which is provided with an electromagnet having high electromagnetic efficiency and by which realization of high sensitivity or reduction of electric power consumption becomes possible, in a structure of the electromagnet incorporated into the electromagnetic relay, particularly, of the electromagnet by which the electromagnetic efficiency can be improved. CONSTITUTION:An electromagnetic relay is provided with a coil 1 formed by winding round a coil bobbin 11, an iron core 5 penetrating the coil 1, a yoke 6 having a bottom part 61 to fix the iron core 5 and a side wall part 62 orthogonal to the bottom part 61 and an armature 4 swingably retained on the tip of the side wall part 62. The side wall part 62 of the yoke 6 is provided so as to surround the coil 1 of this electromagnetic relay.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet incorporated in an electromagnetic relay and, more particularly, to an electromagnet structure capable of improving electromagnetic efficiency.

In recent years, electromagnetic relays have been incorporated in various electronic devices, but electromagnetic relays used for such applications are required to be small in size. Further, since it is often driven directly by a semiconductor integrated circuit or the like, high sensitivity and low power consumption are required.

However, it cannot be considered that the conventional electromagnet incorporated in the electromagnetic relay uses the generated magnetic flux with high efficiency. Therefore, there has been a demand for the development of an electromagnet capable of improving electromagnetic efficiency as a means for realizing high sensitivity and power saving of an electromagnetic relay.

[0004]

2. Description of the Related Art FIG. 4 is a side sectional view showing a driving portion of a conventional electromagnetic relay, and FIG. 5 is a diagram showing a suction force characteristic of the electromagnetic relay.

In FIG. 4, the drive unit of the conventional electromagnetic relay is a coil 1 wound around a coil bobbin 11 and an L-shaped yoke 2.
It is equipped with The yoke 2 is composed of a bottom portion 21 that comes into contact with the end surface of the coil bobbin 11 and a side wall portion 22 that is orthogonal to the bottom portion 21. One end of the iron core 3 that penetrates the coil 1 also penetrates the bottom portion 21. It is stuck to 21.

The armature 4 facing the end face of the side wall portion 22 and the end face of the iron core 3 is swingably held at the tip of the side wall portion 22, and normally the armature 4 is operated by a spring (not shown).
Is separated from the end surface of the iron core 3, but when the coil 1 is energized, the armature 4 swings and is attracted to the end surface of the iron core 3 by the action of the magnetic flux flowing along the iron core 3 and the yoke 2.

In the electromagnetic relay, the movable contact spring is driven by the armature 4 which is swingably held at the tip of the side wall portion 22, and the moving value and holding force of the electromagnetic relay are determined by the iron core 3 when the coil 1 is energized. It depends on the force of attracting the armature 4. In addition, the armature 4 from the normal state until it comes into contact with the end surface of the iron core 3
The distance traveled by affects the stroke of the movable contact spring.

The force with which the iron core 3 attracts the armature 4, that is, the attraction force characteristic, is 0 before the coil 1 is energized, as shown by the thick solid line in FIG. 5, but the energization of the coil 1 causes the armature 4 to move. It is sucked and increases as it approaches the iron core 3, and becomes maximum when it comes into contact with the end surface of the iron core 3.

[0009]

FIG. 6 is a diagram showing a problem in the conventional electromagnetic relay. When the coil wound around the coil bobbin is energized, magnetic flux is generated over the entire circumference of the coil as shown by the broken line in Fig. 6 (a). In order to achieve high sensitivity and power saving of the electromagnetic relay, the applied power must be converted into the attractive force with high efficiency.

However, in the conventional electromagnetic relay using the L-shaped yoke, most of the magnetic flux flows to the yoke through the iron core, but a part of the magnetic flux leaks to the outside, and for example, the cross-sectional area of the side wall is increased. However, even if measures such as lowering the magnetic resistance are taken, there is a limit to the improvement of electromagnetic efficiency.

Further, as shown in FIG. 6 (b), the conventional electromagnetic relay in which the tip of the iron core is caulked to the bottom portion as a means for fixing the iron core to the bottom portion has a dimensional error in forming parts and an error in caulking. May cause a level difference between the end face of the yoke and the end face of the iron core.

However, if the level difference is large, a gap that increases the magnetic resistance is created between the end face of the side wall portion or the end face of the iron core and the attracted armature, and the attraction force decreases as shown by the broken line in FIG. When the force characteristic is close to the load curve, the predetermined holding force cannot be obtained.

In an ordinary electromagnetic relay, the load curve due to the movable contact spring or the like increases in a polygonal line shape as shown by a thin solid line in FIG. In order to achieve high sensitivity and power saving of the electromagnetic relay, it is desirable that the attraction force characteristic is close to the load curve and a predetermined holding force is finally obtained.

However, in the conventional electromagnetic relay, the attraction force characteristic must be made sufficiently larger than the load curve for the above reason. Moreover, there is a problem that the moving distance until the attracted armature comes into contact with the iron core fluctuates, causing a stroke error in the movable contact spring.

It is an object of the present invention to provide an electromagnetic relay that includes an electromagnet having high electromagnetic efficiency and can achieve high sensitivity and power saving.

[0016]

FIG. 1 is a principle view showing a drive section of an electromagnetic relay according to the present invention. Note that the same object is denoted by the same symbol throughout the drawings.

The above problem is solved by the coil 1 wound around the coil bobbin 11, the iron core 5 penetrating the coil 1, and the iron core 5.
1. An electromagnetic relay having a yoke 6 having a bottom portion 61 for fixing the bottom portion 61 and a side wall portion 62 orthogonal to the bottom portion 61, and an armature 4 rotatably held at the tip of the side wall portion 62. This is achieved by the electromagnetic relay of the present invention in which the side wall portion 62 of the yoke 6 is provided so as to surround the.

[0018]

In the electromagnetic relay of the present invention in which the side wall of the yoke is provided so as to surround the coil in FIG. 1, all the magnetic flux generated by the coil flows into the yoke and the armature is provided. Since it contributes to the adsorption of the, the electromagnetic efficiency can be further improved.

Further, since the attracted armature comes into contact with the side wall portion and stops, there is no gap between the armature and the end surface of the side wall portion, and the variation in the attraction force is reduced. Moreover, the moving distance of the attracted armature can be stabilized and the stroke error of the movable contact spring can be reduced.

Further, for example, by press-fitting the iron core into the bottom portion of the yoke with reference to the end surface of the side wall portion of the yoke, dimensional errors and the like at the time of component formation are absorbed, and the end surface of the iron core with respect to the armature is at a fixed position. Therefore, it is possible to further reduce the variation in the suction force.

As a result, even if the electromagnetic relay is constructed so that the attraction force characteristic is brought close to the load curve and a predetermined holding force is obtained, the electromagnetic relay always operates stably. That is, it is possible to realize an electromagnetic relay that includes an electromagnet having a high electromagnetic efficiency and can achieve high sensitivity and power saving.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 2 is a perspective view showing an embodiment of the electromagnetic relay according to the present invention, and FIG. 3 is a perspective view showing another embodiment of the electromagnetic relay according to the present invention.

In FIG. 1, the drive part of the electromagnetic relay according to the present invention is a cylindrical container-shaped yoke 6 formed by drawing.
The tip of the iron core 5 that penetrates the coil 1 wound around the coil bobbin 11 is press-fitted into the bottom of the yoke 6, that is, the bottom portion 61.

Both ends of the coil 1 are coil bobbins 11 respectively.
Also, the armature 4 is oscillated via the spring 41 at the tip of a cylindrical side wall portion 62 which is connected to the lead terminal 12 penetrating the bottom portion 61 of the yoke 6 and is orthogonal to the bottom portion 61 and surrounds the coil 1. It is mounted so that it can move freely.

Thus, in the electromagnetic relay of the present invention, which has the cylindrical container-like yoke and the side wall of the yoke is provided so as to surround the coil, all of the magnetic flux generated by the coil flows into the yoke and the armature is provided. Since it contributes to the adsorption of the, the electromagnetic efficiency can be further improved.

Further, since the attracted armature comes into contact with the side wall portion and stops, there is no gap between the armature and the end surface of the side wall portion, and the variation in the attraction force is reduced. Moreover, the moving distance of the attracted armature can be stabilized and the stroke error of the movable contact spring can be reduced.

Further, by press-fitting the iron core into the bottom portion of the yoke with reference to the end surface of the side wall portion of the yoke, dimensional errors and the like during component formation are absorbed, and the end surface of the iron core is kept at a fixed position with respect to the armature. Therefore, it becomes possible to further reduce the variation in the suction force.

As a result, even if the electromagnetic relay is constructed so that the attraction force characteristic is brought close to the load curve and a predetermined holding force is obtained, the electromagnetic relay always operates stably. That is, it is possible to realize an electromagnetic relay that includes an electromagnet having a high electromagnetic efficiency and can achieve high sensitivity and power saving.

However, since the electromagnetic relay having the cylindrical container-like yoke is provided with the lead terminal penetrating the coil bobbin and the bottom portion, it is necessary to make the diameter of the yoke sufficiently larger than the diameter of the coil. It becomes a factor that hinders the miniaturization of relays.

An embodiment of the electromagnetic relay according to the present invention is shown in FIG.
The coil 1 is wound around a square or rectangular coil bobbin 11 as shown in, and both ends of the coil 1 are coil bobbins.
It is connected to the lead terminal 12 which is provided at the corner of 11 and penetrates the bottom portion 61 of the yoke 6.

The yoke 6 has side wall portions 62 arranged in four directions around the coil 1, and the armature 4 is swingably mounted on one of the side wall portions 62. Further, the iron core 5 penetrating the coil 1 is press-fitted into the bottom of the yoke 6, that is, the bottom portion 61, with reference to the end face of the side wall portion 62.

As described above, one embodiment of the electromagnetic relay according to the present invention, in which side walls of the yoke are arranged around the coil and lead terminals are provided at the corners, is provided with the cylindrical container-shaped yoke. The same effect as that of the electromagnetic relay can be obtained, and the size of the electromagnetic relay can be reduced.

Another embodiment of the electromagnetic relay according to the present invention is different from the above embodiment in which the side wall portions 62 are arranged in four directions around the coil 1, and the side wall portions 62 are provided on both sides of the coil 1 as shown in FIG. The armature 4 is swingably attached to one of the side wall portions 62 provided.

As described above, another embodiment of the present invention in which the side wall portions of the yoke are arranged on both sides of the coil and the lead terminals are provided at the corners of the coil bobbin has almost the same effect as the electromagnetic relay in the above-mentioned embodiment. In addition, the electromagnetic relay can be downsized.

[0035]

As described above, according to the present invention, it is possible to provide an electromagnetic relay having an electromagnet having high electromagnetic efficiency and capable of achieving high sensitivity and power saving.

[Brief description of drawings]

FIG. 1 is a principle view showing a drive unit of an electromagnetic relay according to the present invention.

FIG. 2 is a perspective view showing an embodiment of an electromagnetic relay according to the present invention.

FIG. 3 is a perspective view showing another embodiment of the electromagnetic relay according to the present invention.

FIG. 4 is a side sectional view showing a drive unit of a conventional electromagnetic relay.

FIG. 5 is a diagram showing a suction force characteristic of an electromagnetic relay.

FIG. 6 is a diagram showing a problem in a conventional electromagnetic relay.

[Explanation of symbols]

 1 coil 4 armature 5 iron core 6 yoke 11 coil bobbin 12 lead terminal 41 spring 61 bottom 62 side wall

Claims (3)

[Claims] 1. A coil (1) wound around a coil bobbin (11), an iron core (5) penetrating the coil (1), a bottom portion (61) for fixing the iron core (5), and the bottom. Yoke (6) having a side wall (62) orthogonal to the part (61), and the side wall (62)
An electromagnetic relay having an armature (4) oscillatably held at the tip of the yoke, the yoke being so as to surround the coil (1).
An electromagnetic relay comprising a side wall portion (62) of (6). 2. In the electromagnetic relay according to claim 1, yokes are provided on both sides or in all directions centering on the coil (1).
An electromagnetic relay comprising a side wall portion (62) of (6). 3. The electromagnetic relay according to claim 1, wherein the other end of the iron core (5) is press-fitted into the bottom portion (61) of the yoke (6).