JPH11336933A - Solenoid valve and fixing method for its fixed core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve simplified in an assembly process and the fixing method for its fixed core. SOLUTION: In this solenoid valve 1 having a sleeve 2, a solenoid wound to the outer periphery of the sleeve 2, a fixed core 3 fixed in the sleeve 2 and a movable core 4 arranged slidably to the sleeve 2, on the outer periphery of the fixed core 3, an engaged projection 3a engageable with the inner periphery of the sleeve 2 and a tapered step difference 3ba for expanding whose outer periphery to the inner periphery of the sleeve 2 by the force received in the axial direction are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve.

[0002]

2. Description of the Related Art A conventional solenoid valve generally includes a sleeve, a solenoid wound around the outer periphery of the sleeve,
In a solenoid valve including a fixed core fixed in the sleeve and a movable core slidably disposed in the sleeve, the fixed core has an annular groove in an outer peripheral portion thereof, and the sleeve has an outer peripheral portion. It has an inwardly protruding portion that projects toward the central portion by receiving a force from the side toward the central portion and engages with the annular groove.

[0003]

However, in such a conventional solenoid valve, particularly when the fixed core is fixed to the sleeve, after the fixed core is inserted into the sleeve in the axial direction, the side of the sleeve is centered. The fixed core is fixed in the sleeve by being pressed toward the portion and extending inward to engage with an annular groove formed on the outer periphery of the fixed core.

Accordingly, in mounting the fixed core to the sleeve, it is necessary to perform two operations, that is, the operation of the fixed core in the axial direction and the operation of the sleeve in the axial vertical direction. There is a problem that the size is increased and the cost is increased accordingly.

It is an object of the present invention to provide a solenoid valve and a method for fixing a fixed core thereof, in which an assembling process is simplified.

[0006]

In order to solve the above problems, a sleeve, a solenoid wound around the outer periphery of the sleeve, a fixed core fixed in the sleeve,
An electromagnetic valve comprising a movable core slidably disposed within the sleeve, wherein the fixed core has an outer peripheral portion that can be engaged with an inner peripheral portion of the sleeve, and an axially extending engagement portion. And a magnifying mechanism for expanding the outer peripheral portion toward the inner peripheral portion of the sleeve by a received force.

Preferably, the solenoid valve is characterized in that the enlargement mechanism has a tapered hole extending in the axial direction in the fixed core.

[0008] Also, an insertion step of inserting a fixed core in the sleeve constituting the solenoid valve in the axial direction, and pressing the fixed core in the axial direction to spread the fixed core in a direction perpendicular to the axial direction. Thus, the fixing method of the fixed core of the electromagnetic valve includes a fixing step of fixing the fixed core to the sleeve by engaging an inner peripheral portion of the sleeve and an outer peripheral portion of the fixed core.

According to the first aspect of the present invention, when the fixed core is attached to the sleeve, the outer peripheral portion is expanded toward the inner peripheral portion of the sleeve by the enlargement mechanism when the fixed core receives a force in the axial direction. The engaging portion engages with the inner peripheral portion of the sleeve.

In the solenoid valve according to the second aspect, in addition to the operation of the first aspect, the tapered hole receives the axial force of the fixed core, so that the outer peripheral portion of the fixed core is expanded to the inner peripheral portion of the sleeve.

According to a third aspect of the present invention, there is provided a method for fixing a fixed core.
The direction in which the fixed core is inserted into the sleeve and the direction in which the fixed core is pressed can be the same direction.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments.

FIG. 1 is a sectional view of a solenoid valve according to an embodiment of the present invention. The solenoid valve 1 has a bottomed cylindrical shape and a sleeve 2 made of a magnetic material, a solenoid (not shown) wound around the outer periphery of the sleeve 2, a fixed core 3 made of a magnetic material, a movable core 4 made of a magnetic material, and And a valve seat 5.

The fixed core 3 having a substantially cylindrical shape is a sleeve 2
1 is fixedly arranged in an assembling hole 2 extending in the axial direction (vertical direction in FIG. 1) such that one end surface thereof is in contact with the bottom 2b. The fixed core 2 has a plurality of engagement projections 3a on the outer periphery thereof and has a stepped hole 3b extending in the axial direction (vertical direction in FIG. 1). The step 3ba of the stepped hole 3b has a tapered shape whose diameter is reduced toward the bottom 2a of the sleeve 2.

The movable core 4 is disposed in the mounting hole 2a of the sleeve 2 so that the movable core 4 can slide in the axial direction of the sleeve 2 and one end face of the movable core 4 and the other end face of the fixed core 3 face each other. . The movable core 4 has one end at one end (the upper side in FIG. 1).
And a spherical valve element 4b at the other end.

On the other side (lower side in FIG. 1) of the movable core 4, a valve seat 5 on which the valve body 4b is seated is provided.

Between the bottom 2b of the sleeve 2 and the movable core 4, one end abuts on the bottom 2b of the sleeve 2 and the other end abuts on the bottom surface of the recess 4a of the movable core 4, and the fixed core 3 A spring 6 penetrating through the stepped hole 3b is provided. The spring 5 urges the movable core 4 in a direction away from the fixed core 3 (downward in FIG. 1) so that the valve body 4b is seated on the valve seat 5.

A first port 2c communicating with a fluid passage (not shown) is formed in an outer peripheral portion of the sleeve 2, and the valve seat 5 has a second port 5a communicating with a fluid passage (not shown). When the valve element 4b is seated on the valve seat 5, communication between the first port 2c and the second port 5a is interrupted,
When the valve element 4b is separated from the valve seat 5, the first port 2c and the second port 5a communicate with each other.

The operation of the solenoid valve 1 is as follows. In the initial state shown in FIG. 1 where the solenoid (not shown) is not energized,
Since the movable core 4 is urged downward (downward in FIG. 1) by the spring 6, the valve element 4 ba is seated on the valve seat 5. Accordingly, communication between the first port 2c and the second port 5a is interrupted.

When a solenoid (not shown) is energized, the sleeve 2, the fixed core 3, and the movable core 4 form a magnetic path, and an attractive force is generated between the movable core 4 and the fixed core 3. The core 4 is sucked upward (upward in FIG. 1) against the urging force of the spring 6, and the upper end surface of the movable core 4 is
Abuts the lower end surface of the Therefore, when the valve element 4b is separated from the valve seat 5, the first port 2c is communicated with the second port 5a.

FIG. 2 is a view showing a state in which the fixed core 3 is attached to the sleeve 2. As shown in FIG. 2, in mounting the fixed core 3 on the sleeve 2 of the solenoid valve 1, first, the fixed core 3 is inserted into the mounting hole 2 a of the sleeve 2 in the axial direction of the fixed core 3. At this time, there is a clearance between the outer peripheral portion of the fixed core 3 and the inner peripheral portion of the sleeve 2, and the fixed core 3 is in a state where it can move in the mounting hole 2 a of the sleeve 2.

Next, one end thereof is reduced in diameter from the other side (upper side in FIG. 2) to one side (lower side in FIG. 2) so as to correspond to the stepped portion 3ba of the stepped hole 3b of the fixed core 3. A jig 7 having a tapered portion 7 a having a tapered shape is inserted into the mounting hole 2 a of the sleeve 2 from the opening of the sleeve 2 in the axial direction of the fixed core 3. Eventually, the tapered portion 7a of the jig 7 comes into contact with the step 3ba of the fixed core 3, and the jig 7 presses the fixed core 3 downward.

The jig 7 contacts the fixed core 2, and the tapered portion 7 a of the jig 7 slides on the step 3 ba of the fixed core 3,
When the jig 7 is moved downward with respect to the sleeve 2 and the fixed core 3, the pressing force of the jig 7 to the fixed core 3 in the axial direction of the fixed core 3 is applied to the tapered portion 7 a of the jig 7 and the fixed core 3. The contact of the fixed core 3 with the step 3ba is converted into a force acting to expand the outer peripheral portion of the fixed core 3 toward the inner peripheral portion of the sleeve 2.

That is, the force acting to press the fixed core 3 in the axial direction by the pressing of the jig 7 is converted into a force acting to expand the fixed core 3 in the radial direction of the fixed core 3. Will be done.

When the diameter of the fixed core 3 is increased, the engaging projection 3a formed on the outer peripheral portion of the fixed core 3 bites into the inner peripheral surface of the sleeve 2. And the fixed core 3 is fixed to the sleeve 2.

As described above, according to the method of fixing the solenoid valve 1 and the fixed core 3 of the present embodiment, the direction in which the fixed core 3 is inserted into the sleeve 2 and the direction in which the jig 7 presses the fixed core 3. Are uniaxial, so that the fixed core 3 can be attached to the sleeve 2 only in one direction.

For example, by inserting the fixed core 3 and the jig 7 into the sleeve 2 in a state where the fixed core 3 is attached to the jig 7 so that the step portion 3ba and the tapered portion 7a come into contact with each other,
The fixed core 3 can be installed and fixed on the sleeve 3.

That is, it is possible to simplify the assembling process, reduce the size of the assembling equipment, and reduce the cost associated therewith.

Therefore, it is possible to provide a method of fixing the solenoid valve 1 and the fixing core 3 to the sleeve 2 in which the assembling process is simplified.

In this embodiment, the fixed core 3 is formed with the engaging projections 3a. However, the present invention is not limited to this configuration. What is necessary is just to be provided with the part which can be engaged with a part.

In the present embodiment, the jig 7 has the tapered portion 7a. However, the present invention is not particularly limited to this configuration. For example, the jig 7 having a straight end is used. However, the same operation and effect can be obtained.

Although the present invention has been described based on the above embodiments, the present invention is not limited to only the above embodiments, but includes various embodiments according to the principle of the present invention.

[0033]

As described above, according to the first and third aspects of the present invention, the insertion direction of the fixed core into the sleeve and the pressing direction on the fixed core are the same.
Attachment of the fixed core to the sleeve is possible only by one-way operation.

Therefore, it is possible to provide an electromagnetic valve in which the assembly process is simplified.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, a better mode of the enlargement mechanism is shown.

[Brief description of the drawings]

FIG. 1 is a sectional view of a solenoid valve 1 according to an embodiment.

FIG. 2 is a diagram showing a method for assembling a fixed core 3 to a sleeve 2 according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Sleeve 3 Fixed core 3a Engagement projection part 3ba step part 4 Movable core

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomohiko Funabashi 2-1-1 Asahicho, Kariya City, Aichi Prefecture Inside Aisin Seiki Co., Ltd.

Claims (3)

[Claims] 1. An electromagnetic valve comprising a sleeve, a solenoid wound around the outer periphery of the sleeve, a fixed core fixed in the sleeve, and a movable core slidably disposed in the sleeve. In the fixed core, an outer peripheral portion of the engaging portion capable of engaging with the inner peripheral portion of the sleeve, and an expansion mechanism for expanding the outer peripheral portion to the inner peripheral portion of the sleeve by a force received in the axial direction. An electromagnetic valve, comprising: 2. The solenoid valve according to claim 1, wherein the enlargement mechanism has a tapered hole extending in the axial direction in the fixed core. 3. An insertion step of inserting a fixed core in a sleeve constituting a solenoid valve in the axial direction thereof, and pressing the fixed core in the axial direction to spread the fixed core in a direction perpendicular to the axial direction. A fixing step of fixing the fixed core to the sleeve by engaging an inner peripheral portion of the sleeve with an outer peripheral portion of the fixed core.