JPH0574625A - Plunger type solenoid - Google Patents

Abstract

PURPOSE:To obtain a solenoid of stable quality at a low cost, by forming a fixed core and a plunger in the respective integral bodies by bending the respective magnetic plates. CONSTITUTION:The title solenoid consists of an electromagnetic coil 1 having a penetration hole 1a in the central part, a fixed core 2 which surrounds the coil 1 and forms a magnetic path, and a plunger 3 which is inserted in the penetration hole 1a, and attracted and released by the fixed plunger 2. In this plunger type solenoid, the fixed core 2 and the plunger 3 are formed in the respective integral bodies by bending the respective magnetic plates 13, 14. For example, the fixed core 2 is formed in one integral body by bending the magnetic plate 13, and a fixing hole 8 is formed in a fixing part. The plunger 3 also is formed in one integral body by bending the magnetic plate 14, and a notch 12 for linkage is formed in a head part. The electromagnetic coil 1 is accommodated in the fixed core 2 and fixed by a plate spring 4. The plunger 3 is inserted into the penetration hole 1a of the electromagnetic coil 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plunger type solenoid used for electromagnetic operation of various equipment.

[0002]

2 is a perspective view of a conventional plunger solenoid, and FIG. 3 is an exploded perspective view of FIG. In these figures, 1 is an electromagnetic coil having a rectangular through hole 1a in the central portion, 2 is a fixed core that surrounds the electromagnetic coil 1 and forms a magnetic path, and 3 is a fixed core 2 that is inserted into the through hole 1a of the electromagnetic coil 1. Plungers 4 which are attracted and released by means of 4 are leaf springs which are inserted between the electromagnetic coil 1 and the fixed core 2 to fix them to each other.

The fixed core 2 is composed of a plurality of laminated core plates 5
The side plates 6 are overlapped on both sides of, and are integrally caulked with the rivets 7. A mounting hole 8 is provided in the L-bent mounting portion 6 a of the side plate 6. On the other hand, the plunger 3 also has a structure in which a plurality of core plates 9 are caulked together with the side plates 10 on both sides by rivets 11, and a connecting hole 12 is formed in the head of the side plate 10.

[0004]

However, the fixed core 2
In the conventional plunger type solenoid in which the plunger 3 is formed by stacking the core plates 5 and 9, the rivets 7 and 11 can be caulked and the stable characteristics can be obtained to cope with variations in the stack thickness of the core plates 5 and 9. Therefore, there is a problem in that the core plates 5 and 9 need to be aligned and managed, and the number of parts is large, resulting in high cost. Furthermore, the core plate 5,
Because of the stacking method of No. 9, the contact surfaces 2a and 3a are formed during the operation.
However, there is a problem that the flatness of the sheet easily collapses. Therefore, an object of the present invention is to provide a plunger type solenoid which is low in cost and stable in performance.

[0005]

In order to achieve the above object, according to the present invention, a fixed core and a plunger are integrally formed by bending a magnetic plate.

[0006]

Since the fixed core and the plunger are integrally formed by bending the magnetic plate, the work of stacking the core plates and caulking the rivets is eliminated, the number of parts is reduced, and the flatness of the contact surface is not lost.

[0007]

1 is an exploded perspective view of an embodiment of the present invention, in which parts corresponding to those of the conventional example are designated by the same reference numerals. In the figure, the fixed core 2 is integrally formed by bending the magnetic plate 13 as shown, and a mounting hole 8 is formed in the mounting portion. The plunger 3 is also integrally formed by bending the magnetic plate 14, and the head has a notch 12 for connection. The electromagnetic coil 1 is housed in the fixed core 2 and fixed by the leaf spring 4 as in the conventional configuration. The plunger 3 is inserted into the through hole 1a of the electromagnetic coil 1.

According to the structure shown in the figure, since the fixed core 2 and the plunger 3 are formed by bending from one magnetic plate 13 and 14, they can be easily manufactured only by pressing.
There are also few parts. Further, the magnetic contact surfaces 2a and 3a are provided on the magnetic plate 1.
Since the plate surfaces are 3 and 14, flatness does not collapse.

[0009]

According to the present invention, since the fixed core and the plunger are integrally formed by bending the magnetic plates, the troublesome work associated with stacking the core plates and caulking the rivets is eliminated, and the number of parts is reduced. The cost will be lower. In addition, the strength of the contact surface is increased, and stable performance for a long period of time can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of a conventional example.

FIG. 3 is an exploded perspective view of FIG.

[Brief description of drawings]

 1 Electromagnetic Coil 1a Through Hole 2 Fixed Core 3 Plunger 13 Magnetic Plate 14 Magnetic Plate

Claims (1)

[Claims] 1. A plunger comprising an electromagnetic coil having a through hole in a central portion thereof, a fixed core surrounding the electromagnetic coil to form a magnetic path, and a plunger inserted into the through hole and attracted and released by the fixed core. A plunger solenoid, wherein a fixed core and a plunger are integrally formed by bending a magnetic plate.