JP2509675Y2 - Electromagnetic plunger - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic plunger, and in particular, it is intended to reduce the number of parts and improve workability of assembly.

[0002]

2. Description of the Related Art In a conventional electromagnetic plunger, it is necessary to insert a spacer between the bobbin and the yoke after inserting the bobbin to prevent the rattling. An object of the present invention is to improve a workability of assembling and to devise a new structure that can stably fix the bobbin to the yoke without a backlash without a spacer.

[0003]

In the present invention, the bobbin is
It is made of synthetic resin, and is composed of a cylindrical portion and first and second flange portions formed so as to face each other at inner sides of both ends of the cylindrical portion. The first flange portion is formed in a substantially rectangular shape, and an engaging protrusion is formed at one corner of the upper end of the outer surface thereof.

The yoke is made of cold-rolled steel plate and is composed of a rectangular bottom plate and first and second rectangular side plates that are bent and extended at a substantially right angle above both ends thereof. On the first side plate, a circular hole is formed at the center of the plate surface, and the upper portion of the circular hole is removed to form a U-shaped recess integral with the circular hole. An engaging hole is formed at one upper end of the formed convex portion, and a guide concave portion is formed by chamfering a part of an edge formed by the inner surface of the side plate near the engaging hole and the peripheral surface of the U-shaped concave portion. It A circular hole having the same curvature is formed in the second side plate so as to face the lower half circle of the U-shaped recess of the first side plate.

With the engagement protrusion of the bobbin facing upward, both ends of the cylindrical portion are engaged with the lower end of the U-shaped recess and the circular hole of the second side plate, respectively, and the bobbin is directed toward the engagement hole of the yoke. By rotating the engaging projections in the guide recesses of the yoke to engage with the engaging holes, the first and second flange portions of the bobbin are coupled to the first and second flanges of the yoke. Hold it by the side plate.

It is desirable that a first protrusion is formed at the other corner of the upper end of the outer surface of the first flange portion, and a second protrusion is formed at the lower corner of the lower end of the engaging protrusion.
Further, of the lower half of the first flange portion, a half portion diagonally opposed to the engaging protrusion is an arc portion coaxial with the cylindrical portion, and the second flange portion is the arc portion. It is desirable to be formed in a disk shape having the same radius of curvature as the peripheral edge of.

[0007]

An embodiment of the present invention will be described with reference to FIG. The electromagnetic plunger includes a yoke 1, a cylindrical bobbin 2 housed and held in the yoke 1, a coil 3 wound around the bobbin 2, and a center hole of the bobbin 2 so as to be able to move back and forth. Is composed of an armature 4 arranged so as to project from the center hole to the outside, and a coil spring 5 wound around the one end of the armature 4 outside the yoke 1 to bias the armature 4 from one end of the bobbin 2 to the outside. To be done. Apply current to coil 3 and armature 4
Against the biasing force of the coil spring 5 and moves in the direction opposite to the biasing direction. If the electric current is turned off, the coil spring 5
Due to the biasing force of, the armature 4 is returned to the position shown in the figure.

As shown in FIG. 2, the bobbin 2 is made of a synthetic resin, and comprises a cylindrical portion 2a and first and second flange portions 2b and 2c which are formed so as to face the inner sides of both ends of the cylindrical portion 2a. .
The first flange portion 2b is formed in a substantially rectangular shape, and the engaging protrusion 2d is provided at one corner of the upper end of the outer surface and the first protrusion is provided at the other corner.
A protrusion 2e is formed, and a second protrusion 2f is formed at a lower corner of the lower end of the engaging protrusion 2d. In this example, the first,
The second protrusions 2e and 2f are smaller in outer diameter and height than the engaging protrusion 2d. Of the lower half of the first flange portion 2b,
A half portion (that is, about 1/4 of the whole) diagonally opposed to the engaging protrusion 2d has a circular arc portion 2g coaxial with the cylindrical portion 2a.
It is said. The second flange portion 2c is formed in a disc shape having the same radius of curvature as the peripheral edge of the arc portion 2g. First flange portion 2b
A T-shaped projection 2h is provided in the middle of the upper edge of the. Bobbin 2
One end of the coil 3 wound around is tangled to the T-shaped projection 2h and fixed, and then led out to the outside.

The second flange portion 2 at the end 2k of the cylindrical portion 2a
protrusion length Δ ₁ from c and the _first and second flange portions 2b
The protrusion length Δ ₂ of the protrusions 2e and 2f is set to be almost equal. As shown in FIG. 3, the yoke 1 is made of a cold-rolled steel plate, and has a rectangular bottom plate 1a, and first and second rectangular side plates 1b which are bent and extended substantially at right angles above both ends thereof. 1c
Consists of On the first side plate 1b, a circular hole is formed substantially at the center of the plate surface, and the upper portion of the circular hole is deleted to form a U-shaped recess 1d integral with the circular hole. The upper half of the first side plate 1b is separated by a U-shaped recess 1d to form a pair of protrusions 1e and 1f, and an engaging hole 1g is formed at the upper end of one of the protrusions 1e. As shown in FIG. 4, the engagement hole 1
A part of the edge formed by the inner surface of the side plate near g and the peripheral surface of the U-shaped recess 1d is chamfered to form a guide recess 1h.

A circular hole 1i having the same curvature is coaxially formed in the second side plate 1c so as to face the lower half circle of the U-shaped recess 1d of the first side plate 1b. Therefore, the width of the U-shaped recess 1d and the circular hole 1
It has the same length R ₁ as the diameter of i. The size R ₁ is set to be slightly larger than the diameter R ₂ of the cylindrical portion 2a of the bobbin 2. The distance L ₁ between the first and second side plates 1b and 1c is equal to the bobbin 2
End surface of the cylindrical portion 2a on the end portion 2k side and the first flange portion 2
The distance L _{2 from} the outer surface of b (see FIG. 2) is set almost equal. The common width W ₁ of the first and second side plates 1b and 1c is approximately equal to the common width W ₂ of the first and second flange portions 2b and 2c of the bobbin, but is set slightly larger. In this example, the diameter of the engagement hole 1g of the first side plate is set smaller than the diameter of the engagement protrusion 2d of the first flange portion 2b of the bobbin 2. Therefore, when both are engaged, only the top of the engagement protrusion 2d is in a state of protruding into the engagement hole 1g.

Next, a procedure for fixing the bobbin 2 to the yoke 1 will be described. (a) As shown in FIG. 5, the engagement protrusion 2d of the bobbin is turned up,
The axis of the bobbin 2 is laid parallel to the axis of the yoke 1 with the arc portion 2g facing downward so that the end 2k of the bobbin abuts the inner surface of the second flange portion 2c of the yoke and the end 2j of the cylindrical portion 2a. Is inserted into the U-shaped recess 1d of the yoke, the axis of the bobbin is kept parallel to the axis of the yoke, the bobbin 2 is pushed downward, and the end 2j is brought into contact with the lower end of the U-shaped recess 1d. In this state, the end portion 2k of the cylindrical portion is the circular hole 1 of the second side plate.
Since it is substantially coaxial with i, the bobbin 2 is shifted and the end 2k is inserted into the circular hole 1i. As shown in FIG. 5, the engaging projection 2d is released inside the U-shaped recess 1d, and the first and second projections 2e and 2f are released outside the both side edges of the first side plate 2b. It is no hindrance to the assembly work.

(B) When the bobbin 2 is rotated in the direction of the arrow 11 in FIG. 5 with some force, the engaging projection 2d is guided by the guide recess 1g shown in FIG. 4 and is guided to the inner surface of the side plate 1b. You can get on. That is, since the yoke 1 has elasticity, the first and second side plates 1b and 1c, particularly the convex portion 1e of the first side plate, can be formed by slightly warping outward. Since the end 2k of the bobbin is inserted into the circular hole 1i by the same size as the protrusion length Δ ₂ , the first and second protrusions 2e and 2f are contacted or closely opposed to the inner surface of the first side plate 1b. To be in a state. When the bobbin 2 is further rotated in the direction of arrow 11 by a quarter turn from the initial state, the engaging projection 2d is fitted into the engaging hole 1g, and the warped yoke 1 is restored by its own restoring force. Return to the state without warping. Also, the first flange portion 2
b is engaged with the first side plate 1b by the engaging protrusion 2d and the first and second protrusions 2e, 2f, the outer surface of the second flange portion 2c is in contact with the inner face of the second side plate 1c, and is held by both side plates. (End of item (b).) When the bobbin 2 is rotated as described above, the side of the bobbin 2 facing the bottom plate 1a of the bobbin 2 is an arc portion 2g, so the height H ₁ of the axis of the yoke 1 from the bottom plate 1a is H _1. and it can be set so the height H ₂ slightly larger than the axis of the bobbin 2, it is possible to reduce the overall height of the magnetic armature.

The first and second protrusions 2e and 2f of the first flange portion 2b of the bobbin may be omitted. FIG.
In the example, the armature 4 is provided with pins 4b and 4c made of synthetic resin by press fitting at both ends of a cylindrical movable iron core 4a. A chime can be formed by striking a diaphragm (not shown) with these pins.

[0014]

According to the present invention, the first and second yokes are provided.
The side plates 1b and 1c have a U-shaped recess 1d and a circular hole 1i, the protrusion 1e separated by the U-shaped recess 1d has an engagement hole 1g, and the edge of the peripheral surface of the U-shaped recess 1d near the engagement hole 1g. The guide recesses 1h are provided in the respective portions, and the engaging projections 2d are provided in the outer surface of the first flange portion 2b of the bobbin 2, respectively.

Both ends of the cylindrical portion 2a of the bobbin 2 are provided with U-shaped recesses 1
By rotating the bobbin 2 in a state where the bobbin 2 is engaged with the h and the circular hole 1i respectively, the engagement protrusion 2d can be guided by the guide recess 1h and engaged with the engagement hole 1g. Therefore, the bobbin 2 is prevented from moving in the circumferential direction around the axis of the yoke 1, and the first and second flange portions 2b and 2c of the bobbin 2 are held by the first and second side plates 1b and 1c of the yoke 1. It In this way, in this invention, the bobbin 2 can be stably held in the yoke 1 without rattling, without using a spacer. Further, as described above, the assembling work of the bobbin and the yoke 1 is extremely simple, and the number of assembling steps can be greatly reduced.

[Brief description of drawings]

1 is a diagram showing an embodiment of the present invention, in which A is a left side view,
B is a front view, C is a right side view, and D is a bottom view.

2 is a view showing the bobbin 2 of FIG. 1, where A is a left side view and B is
Is a front view and C is a right side view.

3 is a view showing a yoke 1 of FIG. 1, where A is a plan view, B is a left side view, C is a front view, and D is a right side view.

FIG. 4 is a perspective view of a main part of the yoke 1 of FIG.

FIG. 5 is a view for explaining a method of mounting the bobbin 2 of FIG. 1 on the yoke 1.

Claims (3)

(57) [Scope of utility model registration request] 1. A yoke, a cylindrical bobbin accommodated and held in the yoke, a coil wound around the bobbin, and a central hole of the bobbin so as to be advanceable and retractable, and one end of the central hole is formed. The armature is arranged so as to project further outward, and a coil spring that is wound around one end of the armature outside the yoke and biases the armature outward from one end of the bobbin. Then, in the electromagnetic plunger that moves the armature in the direction opposite to the biasing direction against the biasing force of the coil spring, the bobbin is made of synthetic resin,
It is composed of a cylindrical portion and first and second flange portions formed at opposite ends of the cylindrical portion so as to face each other, and the first flange portion is formed in a substantially rectangular shape, and one of the upper end of the outer surface thereof is formed. Engaging yokes are formed at corners of the yoke, the yoke is made of cold-rolled steel plate, and has a rectangular bottom plate and square-shaped first and second rectangular plates that are bent and extended at substantially right angles from both ends thereof. The first side plate is formed with a circular hole at the center of the plate surface, and the upper portion of the circular hole is removed to form a U-shaped recess integrated with the circular hole. An engaging hole is formed at one upper end of the convex portion formed on the left and right of the U-shaped concave portion, and a part of the edge formed by the inner surface of the side plate near the engaging hole and the peripheral surface of the U-shaped concave portion is chamfered A guide recess is formed, and a circular hole having the same curvature is formed in the second side plate so as to face the semicircle below the U-shaped recess of the first side plate. In the upper engagement projection of the bobbin,
By engaging both ends of the cylindrical portion with the lower end of the U-shaped recess and the circular hole of the second side plate, respectively, and rotating the bobbin in the direction of the engaging hole of the yoke, the engaging protrusion of the yoke is moved. It is characterized in that it is guided by a guide recess to be engaged with the engaging hole, and that the first and second flange portions of the bobbin are held by the first and second side plates of the yoke. Plunger. 2. The first protrusion is formed at the other corner of the outer surface upper end of the first flange portion, and the second protrusion is formed at the lower corner of the lower end of the engaging protrusion. An electromagnetic plunger characterized in that 3. The lower half portion of the first flange portion as claimed in claim 1 or 2, wherein a half portion diagonally opposed to the engaging projection is an arc portion coaxial with the cylindrical portion, The electromagnetic plunger, wherein the second flange portion is formed in a disk shape having the same radius of curvature as the peripheral edge of the arc portion.