JP2527314Y2 - Electromagnetic actuator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic actuator driven by an electromagnetic force.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic actuator, for example, one described in Japanese Utility Model Laid-Open No. 58-172166 is known.

As shown in FIGS. 3 and 4, this conventional electromagnetic actuator is provided in contact with an electromagnet 5 having a coil 5c wound around a core 5a via a bobbin 5b, and in contact with the core 5a. A yoke 5e having an armature supporting portion 5d integrally formed at one end thereof by press molding.
And an electromagnet 1 with the armature support 5d as a fulcrum.
The armature 6 is supported so as to be swingable by the urging and de-energization of the armature.

[0004]

However, in such a conventional electromagnetic actuator, the end surface of the armature support portion 5d, which is a swing fulcrum of the armature 6, is formed by a fracture surface at the time of press forming. Therefore, as shown in detail in FIG. 4, there is a problem that the press burr b formed at the fulcrum becomes a friction when the armature 6 is operated, and the operation responsiveness of the armature 6 is reduced.

Although this problem can be solved by performing secondary processing for removing press burrs, another problem that the cost is high arises.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an electromagnetic actuator capable of improving the operation response of an armature without requiring secondary machining. Is what you do.

[0007]

In order to achieve the above-mentioned object, an electromagnetic actuator according to the present invention comprises an electromagnet having a coil wound around a core, a yoke provided in contact with the core, An armature supported pivotally by an electromagnet with a support portion formed at one end of the yoke as a fulcrum, wherein the support portion is formed of a synthetic resin containing a magnetic material. Means.

[0008]

In the electromagnetic actuator of the present invention, since the above-described means are used, when the electromagnet is excited by energizing the coil, the yoke, the support portion formed of the synthetic resin containing the magnetic material, and the armature are arranged in this order from the core. A magnetic path is formed which loops back to the core, whereby the free end side of the armature is attracted in the direction of the core to generate rocking power.

The swing of the armature is performed with the support portion as a fulcrum. Since the support portion is made of synthetic resin, the support portion can be smoothly rounded during resin molding. Yes, this makes it possible to increase the operation response of the armature without requiring complicated secondary processing.

Since the synthetic resin constituting the supporting portion contains a magnetic material, it does not hinder the formation of a magnetic path.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. First, the configuration of the embodiment will be described. 1 and 2 are cross-sectional views illustrating an electromagnetic actuator according to an embodiment of the present invention. In the drawings, reference numeral 1 denotes an electromagnet. The electromagnet 1 includes a columnar core 11 as a magnetic core, a bobbin 12 provided on the outer periphery thereof, a coil 13 wound around the bobbin 12, and yokes 14 connected to both ends of the core 11.
The core 11 is excited by energizing the coil 13.

The bobbin 12 is formed of a magnetic material-containing synthetic resin into which a granular or powdery magnetic material has been kneaded, and has an E-shaped cross section having enlarged portions 12a and 12b at both upper and lower ends.

The yokes 14a and 14b are made of a metal having the same magnetic properties as the core 11, and are buried in the upper and lower enlarged portions 12a and 12b of the bobbin 12 in parallel with each other. The upper and lower ends of the core 11 are integrally connected. A base end (lower end in the figure) is provided on the front end side of both yokes 14a and 14b.
Is formed on the support portion 1 formed on the distal end surface of the lower yoke 14b.
2c is swingably supported, and a stopper portion 1 formed on the tip end surface of the upper yoke 14a at the tip end (upper end in the drawing).
The armature 2 is provided so as to face 2e. That is, the support portion 12c and the stopper portion 12e are
The support portion 12c is formed in an arc along the swinging direction of the armature 2, and is formed integrally with the bobbin 12 from a magnetic material-containing synthetic resin.

The lower enlarged portion 1 of the bobbin 12
A hook 12d is formed integrally with the lower surface of the armature 2b, while a locking groove 21 is formed at the lower end of the armature 2. And the locking groove 21 of this armature 2
The spring 3 is interposed between the armature 2 and the hook 12d in a locked state, and the armature 2 swings in a direction in which the distal end is separated from the distal end stopper 12e of the upper yoke 14a to open the gap h. You are urging you to.

Next, the operation of the embodiment will be described. First, when the energization to the coil 13 is released and the electromagnet 1 is not excited, as shown in FIG.
The urging force of the spring 3 keeps the upper yoke 14a swinging to open the gap h between the upper end yoke 14a and the tip stopper 12e.

Next, by energizing the coil 13, the electromagnet 1
Is excited, the lower yoke 14
b, a support portion 12c formed of a magnetic material-containing synthetic resin integrally with the bobbin 12, an armature 2, a gap h, a stopper portion 12 formed of a magnetic material-containing synthetic resin integrally with the bobbin 12.
e, a magnetic path G returning to the core 11 is formed in the order of the upper yoke 14a, whereby the upper end of the armature 2 is sucked toward the tip stopper 12e of the upper yoke 14a to close the gap h. Rocks.

At this time, the swing of the armature 2 is
The support portion 12c is used as a fulcrum, and since the support surface of the support portion 12c is formed in an arc shape along the swing direction of the armature 2, the swing of the armature 2 is performed smoothly. , The operating response of the armature 2 can be enhanced.

Further, by forming the support portion 12c of a synthetic resin, a complicated secondary process for removing press burrs is required as compared with a conventional support portion which is constituted by a press fracture surface by press working. Since it does not, the cost can be reduced. Since the magnetic material is kneaded into the synthetic resin constituting the support portion 12c, it does not hinder the formation of the magnetic path G.

In this embodiment, the bobbin 12 is formed of a synthetic resin containing a magnetic material, and the yokes 14a, 14a are used.
Since b is buried in this synthetic resin, the external dimensional accuracy of each part can be improved, and as a result, the stability of assembly and the stability of performance can be improved.

Further, since the stopper portion 12e is made of a synthetic resin, it is possible to reduce the impact sound when the armature 2 is sucked.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment. For example, in the embodiment, the core and the two yoke portions are made of metal having magnetism. However, these portions can also be integrally formed of a resin containing a magnetic material.

[0022]

As described above, according to the electromagnetic actuator of the present invention, the supporting portion for supporting the swing of the armature is formed of a synthetic resin containing a magnetic material, so that the supporting surface is formed when the resin is molded. Is possible smooth processing of
Thus, an effect is obtained that the operation responsiveness of the armature can be improved without requiring complicated secondary processing.

[Brief description of the drawings]

FIG. 1 is a sectional view illustrating an electromagnetic actuator according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a support portion of the electromagnetic actuator according to the embodiment.

FIG. 3 is a sectional view showing a conventional electromagnetic actuator.

FIG. 4 is an enlarged sectional view showing a supporting portion of a conventional electromagnetic actuator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnet 2 Armature 11 Core 12c Supporting part 13 Coil 14a Yoke 14b Yoke

Claims (1)

(57) [Scope of request for utility model registration] 1. An electromagnet in which a coil is wound around an outer periphery of a core, a yoke provided in contact with the core, and swinging by energization and deenergization by the electromagnet about a support formed at one end of the yoke. An electromagnetic actuator comprising an armature movably supported, wherein the support portion is formed of a synthetic resin containing a magnetic material.