JPH0742862A - Manufacture of solenoid valve device - Google Patents

Abstract

PURPOSE:To provide a method of manufacture of a solenoid valve in which a guide path to guide a plunger in sliding motion can be formed with accuracy and the coaxial accuracy of the plunger with a valve seat can be easily managed. CONSTITUTION:A nonmagnetized portion 20 is formed by melting of that portion of an integral yoke 2 which faces an air gap formed between the integral yoke 2 and a plunger, the integral yoke 2 being made from a magnetic substance. Thereafter a guide path 22 to guide the plunger in sliding motion is formed in the integral yoke 2 by machining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electromagnetic valve device, and more particularly to an electromagnetic valve device having a guide path for guiding sliding of a mover.

[0002]

2. Description of the Related Art A solenoid valve device in which a sleeve integrally guiding a cover and a sleeve for guiding the sliding movement of a mover are assembled is conventionally known (Japanese Patent Laid-Open No. 3-199978).
No. 8).

In the solenoid valve device described in the above publication, a sleeve is assembled to a core (stator) integrally formed with a cover, and a plunger (movable element) driven by an electromagnetic coil is guided by the sleeve to slide. Made to move.

In such a conventional solenoid valve device as described above, the coaxial accuracy between the plunger (valve body) and the valve seat is determined by the accuracy of the core integrally formed in the cover and the accuracy of the sleeve to the core. Determined by precision.

In order to secure the sealing property and responsiveness of the solenoid valve, it is necessary to increase the coaxial accuracy between the plunger and the valve seat.

[0006]

However, as in the above-mentioned conventional solenoid valve device, the coaxial accuracy between the mover and the valve seat is determined by the accuracy of assembly of the stator and the accuracy of assembly of the sleeve to the stator. However, due to the accumulation of the mounting tolerance of the stator and the mounting tolerance of the sleeve to the stator, the coaxial accuracy of the mover and valve seat becomes low, and the sealing and responsiveness of the solenoid valve is secured. There was a problem that I could not do it.

Therefore, in order to improve the accuracy of assembling the stator and the accuracy of assembling the sleeve to the stator, it is conceivable to set and manage the assembling dimensions of the stator and the sleeve very strictly. In such a case, there is a disadvantage in terms of management cost and the like. The present invention has been made in view of the above points, and after demagnetizing a part of the cover portion,
By forming the guide path that guides the sliding of the mover by machining, the guide path can be formed with high accuracy, and the coaxial accuracy between the mover and the valve seat can be easily managed. An object is to provide a method for manufacturing a device.

[0008]

SUMMARY OF THE INVENTION The present invention is a method of manufacturing an electromagnetic valve device in which a cover made of a magnetic material is formed with a guide path for guiding the sliding of a mover. It is characterized in that the guide path is formed by machining after the portion is demagnetized by a melting process.

[0009]

In the cover portion made of a magnetic material, a part of the cover portion is demagnetized by the melting process. Then, after a part of the cover is demagnetized by the melting process, a guide path for guiding the sliding of the mover is formed in the cover by machining.

Therefore, the guide path can be formed with high accuracy, and the assembly accuracy of the cover can be controlled.
The coaxial accuracy between the mover and the valve seat can be easily managed.

[0011]

EXAMPLES Examples of the present invention will be described below.
2 is a sectional view showing a closed state of an example of a normally closed two-way solenoid valve device manufactured by the method of the present invention.

As shown in FIG. 2, the normally closed two-way solenoid valve device 1 manufactured by the method of the present invention comprises an integrated yoke 2
And an electromagnetic coil 3 wound around the integrated yoke 2
And a plunger 5 which is arranged adjacent to the integrated yoke 2 via a spring 4 and which is slidable in a vertical direction in FIG. A ball 6 located at the tip of the plunger 5, a valve seat 7, and a housing 8.

A space portion (air gap portion) 9 is formed between the integrated yoke 2 and the plunger 5 for allowing the plunger 5 to slide in the vertical direction in FIG. 2 by a predetermined amount.

The integrated yoke 2 is assembled and fixed to the housing 8, and the spring 4 urges the plunger 5 in a direction to separate the plunger 5 from the integrated yoke 2.

Therefore, in the normally closed two-way solenoid valve device 1, under the condition that a predetermined current is not flowing through the electromagnetic coil 3, specifically, under the condition that the electromagnetic coil 3 does not generate any magnetic flux, As shown in FIG. 3, the plunger 5 is pressed downward in FIG. 2 so that the ball 6 abuts on the valve seat 7a of the valve seat 7 and the flow path A and the flow path B are kept closed. Made of Then, in this situation, the air gap portion 9 has the maximum width in the vertical direction in FIG.

Further, in the normally closed two-way solenoid valve device 1, when a predetermined current is passed through the electromagnetic coil 3, a predetermined magnetic flux is generated in the central axis direction of the electromagnetic coil 3, and the plunger 5 causes the spring 4 to move. Of the valve seat 7 of the valve seat 7 as a result of being pulled toward the integrated yoke 2 against the urging force of the valve seat 7.
The flow path A and the flow path B are maintained in a conductive state by being released from a. Then, in this situation, the air gap portion 9 has a minimum width in the vertical direction in FIG.

The integral yoke 2, the plunger 5,
The housing 8 is made of a magnetic material.

Next, a method of manufacturing the integrated yoke 2 will be described in detail. The integrated yoke 2 is made of a magnetic material, and is first machined, forged, or pressed into a predetermined shape as shown in FIG.

Next, the portion of the integrated yoke 2 facing the air gap portion 9 is made non-magnetic by a melting process, so that the portion of the integrated yoke 2 is modified into a non-magnetic material, and FIG. As shown in (b), the integrated yoke 2
Then, the non-magnetized portion 20 is formed. In addition, of the integrated yoke 2,
The part that faces the air gap part 9 is made non-magnetic by the melting process because the magnetic flux generated in the central axis direction of the electromagnetic coil 3 is concentrated in the air gap part 9 by passing a predetermined current through the electromagnetic coil 3. This is to allow it.

In the melting process, as shown in FIG. 1B, for example, a laser beam is applied to a portion of the integrated yoke 2 facing the air gap portion 9 to melt the portion, and then the portion is cooled and cooled. It is performed by correcting and modifying the tissue at the site. When the laser beam was actually applied to the integrated yoke 2 made of a magnetic material such as AUM25 to perform laser modification, the magnetic permeability μ of the above portion was changed from μ = 4000 before laser modification to after laser modification. Is μ =
It changed to 2.5 and it was confirmed that the site was sufficiently demagnetized.

Thereafter, a machined portion 21 shown by a broken line in FIG. 1 (c) is machined to form a predetermined guideway 22 for guiding the sliding of the plunger 5 as shown in FIG. 1 (c). The integrated yoke 2 is formed with high precision.

Then, as described above, the integrated yoke 2 in which the non-magnetized portion 20 and the guide path 22 are formed respectively,
As shown in FIG. 2, the housing 8 is assembled.

In the above embodiment, the integrated yoke 2 is used.
Corresponds to the cover part described above, and the plunger 5 corresponds to the mover described above.

Next, the operation of the above embodiment will be described.

The integrated yoke 2 made of a magnetic material of the normally closed solenoid valve device 1 is first formed into a predetermined shape as shown in FIG. 1A by machining, forging, pressing or the like.
Thereafter, as shown in FIG. 1 (b), a portion of the integrated yoke 2 facing the air gap portion 9 is irradiated with a laser beam to melt the portion, and then the portion is cooled and straightened. The portion is demagnetized, and the non-magnetized portion 20 is formed on the integrated yoke 2.

Then, the integral type yoke 2 having the non-magnetized portion 20 is machined as shown in FIG. 1C to obtain the integral type yoke 2 as shown in FIG. 1D.
A guide path 22 for guiding the slide of the plunger 5 is formed with a predetermined machining accuracy. In addition, the demagnetization part 20
The integrated yoke 2 in which the guide path 22 and the guide path 22 are formed is attached to the casing 8.

The normally-closed two-way solenoid valve device 1 shown in FIG. 2 in which the integrated yoke 2 having the non-magnetized portion 20 and the guide path 22 formed in this way is assembled to the casing 8.
Since the plunger 5 is guided by the guide passage 22 formed in the integrated yoke 2 with a predetermined machining accuracy, the sliding of the plunger 5 is prevented, the plunger 5 and the valve seat of the normally closed two-way solenoid valve device 1 are The coaxial precision with 7a is determined only by the precision with which the integrated yoke 2 is assembled to the casing 8.

Further, as shown in FIG. 3, the non-magnetized portion 2 formed on the integrated yoke 2 assembled in the casing 8
0 is located to face the air gap portion 9. Therefore, when a predetermined current is passed through the electromagnetic coil 3 of the normally closed type two-way electromagnetic valve device 1, a predetermined magnetic flux is generated in the central axis direction of the electromagnetic coil 3, but the magnetic flux is concentrated in the air gap portion 9. To do.

According to the above embodiment, the portion of the integrated yoke 2 facing the air gap portion 9 is melted from the magnetic material to form the non-magnetized portion 20 on the portion of the integrated yoke 2. Then, the plunger 5 is attached to the integrated yoke 2.
Since the guide path 22 for guiding the sliding of the guide is formed with a predetermined machining accuracy, that is, the guide path 22 is formed by the machining capable of high-accuracy processing after performing the melting process that causes a decrease in accuracy. Therefore, the guide path 22 can be formed with high accuracy, and the coaxial accuracy between the plunger 5 and the valve seat 7a can be easily achieved only by controlling the accuracy with which the integrated yoke 2 is attached to the casing 8. The magnetic flux generated in the central axis direction of the electromagnetic coil 3 can be concentrated in the air gap portion 9 by allowing a predetermined current to flow through the electromagnetic coil 3.

In the above embodiment, the melting process is not limited to laser modification, but may be alloying, for example, and the material of the integrated yoke 2 is not limited to AUM25. , S45C or the like may be used.

Further, the application of the present invention is not limited to the application to the normally closed two-way solenoid valve device 1 as in the above-mentioned embodiment, and for example, the normally open two-way solenoid valve as shown in FIG. Device 1
It may be applied to 0. 3 is a cross-sectional view showing a state in which the normally open two-way solenoid valve device 10 is open. In FIG. 3, the same components as those in FIG. 2 are designated by the same reference numerals.

The normally open two-way solenoid valve device 10 shown in FIG. 3 will be briefly described. Ball 6A in the figure
Acts as a valve for controlling the conduction between the flow passage C and the flow passage D according to the operation of the needle 5A, and the ball 6B allows only the flow from the flow passage C direction to the flow passage D direction by the action of the spring 4B. Acts as a check valve.

The needle 5A penetrates through the hollow magnetic body 11 and is fixed to an iron core 5B provided separately from the magnetic body 11, and a spring 4A is provided at the tip. The iron core 5B is variable in the axial direction of the iron core 5B, and when it is displaced downward in FIG. 3, it can be displaced to a position where it comes into contact with the magnetic body 11. The magnetic body 11 is fixed so that its position does not change.

In the normally open two-way solenoid valve device 10 having such a structure, the ball 6 is driven by the urging force of the spring 4A under the condition that no current is passed through the solenoid coil 3.
A is moved upward from the valve seat 7a in the figure so that the flow path C and the flow path D are brought into conduction, and the iron core 5B moves upward in FIG. 3 via the needle 5A. As shown in, an air gap portion 9 is formed between the iron core 5B and the magnetic body 11.

On the other hand, when a predetermined current is passed through the electromagnetic coil 3 while the iron core 5A and the magnetic body 11 are separated from each other, a magnetic flux is generated along the central axis of the electromagnetic coil 3, and this magnetic flux is generated. Penetrates the iron core 5B and the magnetic body 11. Therefore,
An attractive force corresponding to the magnetic flux penetrating the two is generated between them, the iron core 5B is displaced in the direction of the magnetic body 11, and the ball 6A is pressed downward through the needle 5A in FIG. The flow path 4D is blocked by the contact.

The integral type yoke 2A of the normally open type two-way solenoid valve apparatus 10 shown in FIG. 3 is processed in the same manner as the integral type yoke 2 of the normally closed type two-way solenoid valve apparatus 1 shown in FIG. Manufactured,
That is, the portion of the integrated yoke 2A facing the air gap portion 9 is melted to form the non-magnetized portion 20, and then the guide path 22 for guiding the sliding of the iron core 5B is formed in the integrated yoke 2A. However, these non-magnetized portion 20 and guide path 2
By assembling the integrated yoke 2A having the two formed therein to the casing 8, the same effect as that of the normally closed two-way electromagnetic valve device 1 can be obtained.

The normally open two-way solenoid valve device 10 shown in FIG.
In the above, the integrated yoke 2A corresponds to the cover portion described above, and the iron core 5B corresponds to the mover described above.

[0038]

According to the present invention, a part of the cover portion is made non-magnetic by melting treatment, and then a guide path for guiding the sliding of the mover is formed in the cover portion by machining. The guide path can be formed with high accuracy, and the coaxial accuracy between the mover and the valve seat can be easily managed only by managing the assembly accuracy of the cover portion.

[Brief description of drawings]

FIG. 1 is a diagram showing a manufacturing process of an integrated yoke.

FIG. 2 is a cross-sectional view showing a closed state of the normally closed two-way solenoid valve device according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state in which the normally open two-way solenoid valve device according to the embodiment of the present invention is opened.

[Explanation of symbols]

 1 Normally closed type two-way solenoid valve device 2, 2A Integrated yoke 3 Electromagnetic coil 4, 4A, 4B Spring 5 Plunger 5B Iron core 6, 6A, 6B Ball 7 Valve seat 7a Valve seat 8 Housing 9 Air gap part 10 Normally open type Two-way solenoid valve device 20 Non-magnetization part 22 Guideway

Claims (1)

[Claims] 1. A method of manufacturing an electromagnetic valve device, wherein a guide path for guiding sliding of a mover is formed in a cover portion made of a magnetic material, wherein a part of the cover portion is demagnetized by melting treatment. After that, the guide path is formed by machining, and the method for manufacturing an electromagnetic valve device.