JP2002317882A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve which can be manufactured at a lower cost without deteriorating fluid control performance by reciprocating motion of a plunger. SOLUTION: This solenoid valve comprises a fixed core 2, a plunger 7 disposed to form a magnetic gap with the fixed core 2, a valve member (ball valve) 10 capable of moving to reciprocate, and valve seats 12a and 13a for the valve member 10. By electromagnetic force generated when energized, the plunger 7 is attracted toward the fixed core 2, and the valve member 2 is moved to get separated from/abutted on the valve seats 12a and 13a, so that fluid is controlled. The fixed core 2 comprises a cylindrical part 21 formed by diametric lamination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for controlling a fluid by reciprocating a plunger used for an automatic transmission of a vehicle, for example.

[0002]

2. Description of the Related Art As a conventional solenoid valve, for example, as shown in Japanese Patent Application Laid-Open No. 10-196828, there is a type in which a fluid valve is switched by reciprocating a ball valve together with a plunger. . The fixed core of such an electromagnetic valve is disposed opposite to the plunger, is composed of a pressed cylinder and a flange, and is caulked and fixed to the case.

[0003]

However, in the above-described solenoid valve, the cylindrical portion and the flange portion of the fixed core are formed by cutting a cylindrical metal member or a forged member. There is a problem that the number of parts increases, which leads to an increase in cost.

It has also been considered that the cylindrical portion and the flange portion of the fixed core are formed as separate members without being integrated, but the number of parts and steps such as press fitting are increased, and assembling becomes complicated. There was a problem that it would.

Therefore, an object of the present invention is to provide an inexpensive and easy-to-manufacture solenoid valve without impairing the fluid control performance due to the reciprocating movement of the plunger.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fixed core, a plunger provided with a magnetic gap formed with the fixed core, and a movement of the plunger facing a valve seat. A valve member that relatively moves with respect to the valve seat, and an electromagnetic valve that attracts the plunger toward the fixed core by an electromagnetic force generated at the time of energization, wherein the fixed cores are laminated in a radial direction. An electromagnetic valve having a cylindrical portion formed by the above method.

According to the present invention, since the cylindrical portion of the fixed core is formed by laminating in the radial direction, it is possible to secure a desired cross-sectional area of the cylindrical portion and to cut a portion which has been conventionally required by cutting. It becomes unnecessary. Therefore, it is possible to provide an inexpensive and easily manufactured solenoid valve without impairing the fluid control performance due to the reciprocating motion of the plunger.

Here, it is preferable that the cylindrical portion is formed by integrally forming a two-layer laminate by press molding. As a result, the flange portion of the fixed core can be integrally formed, so that the number of parts and the number of assembling steps can be reduced.

[0009] More preferably, the fixed core desirably integrally has a case portion that covers a coil wound around a bobbin on the outer periphery of the cylindrical portion. This allows
It is possible to further reduce the number of parts and the number of assembling steps, and to reduce the manufacturing cost.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the solenoid valve according to the present invention will be described below with reference to the drawings.

FIG. 1 is a main sectional view in the axial direction of a solenoid valve 1 according to an embodiment of the present invention. Although not shown, the solenoid valve 1 is, for example, an electromagnetic three-way valve (three fluid ports) for switching a flow path of a fluid used for controlling an automatic transmission or the like of a vehicle.

As shown in FIG. 1, the fixed core 2 includes a cylindrical portion 21, a flange portion 22, and a case portion 23, and is made of a magnetic material. Further, the cylindrical portion 21 is formed integrally with a lamination consisting of two layers, a folded portion 21a and a narrowed portion 21b, in the radial direction, and secures a desired cross-sectional area.

The bobbin 3 is made of a resin material having a substantially cylindrical shape as shown in FIG. Inside the bobbin 3, a yoke 6 is fixedly mounted on the left side in FIG.
Is located. The yoke 6 is made of a magnetic material. A coil 5 is wound on the outer peripheral surface of the bobbin 3.

The plunger 7 is made of a magnetic material having a bottomed cylindrical shape, and is inserted inside the cylindrical portion of the yoke 6 so as to be able to reciprocate in the axial direction. The right end face of the plunger 7 in FIG. 1 and the left end face of the cylindrical portion 21 of the fixed core 2 form a magnetic gap. As a result, the fixed core 2, the plunger 7 and the yoke 6 form a magnetic circuit. The plunger 7 contains a spring 9 therein, and is constantly urged leftward by the urging force of the spring 9.

The rod 8 is coaxially press-fitted and fixed at the left end face of the plunger 7 in FIG. 1, and is reciprocally movable in the axial direction integrally with the plunger 7. The rod 8 is constantly urged leftward in FIG. 1 together with the plunger 7 by the urging force of the spring 9 described above, and the left end of the rod 8 contacts the ball valve 10 housed in the valve housing member 11. , The ball valve 10 is constantly urged leftward.

The valve accommodating member 11 is disposed on the left end surface of the yoke 6 in FIG. 1, and is fixed by caulking the caulking portion 23a of the case portion 23 in a radially inward direction. The valve housing member 11 has three fluid ports, that is, a supply port 11d for supplying a fluid, a control port 11c for supplying a hydraulic pressure to a control target, and a drain port 11e for returning the fluid to the drain. The valve seat members 12 and 13 are caulked and fixed to the valve housing member 11.

The ball valve 10 is located between the valve seat member 12 and the valve seat member 13. Further, the ball valve 10 is moved from a position where the ball valve 10 comes into contact with the valve seat 12 a provided on the valve seat
Is slightly movable in the axial direction to a position where it comes into contact. When the solenoid valve is not operated, the ball valve 10 is always in contact with the valve seat 12a by the leftward urging force of the rod 8, and the communication between the supply port 11d and the control port 11c is cut off. On the other hand, the ball 10 is separated from the valve seat 13a, and the control port 11c and the drain port 11c.
e is in communication. As a result, the fluid pressure at the control port is the pressure at the drain port 11e, that is, the drain pressure.

The connector section 15 is provided to energize the coil 5, and an internal terminal terminal 16 is electrically connected to the coil 5. By electrically connecting the terminal 16 to a current control device (not shown) or the like, the current flowing through the coil 5 can be controlled.

FIG. 2 is a view schematically showing a manufacturing process of the fixed core 2 which is a feature of the present invention, and FIG.
Step, FIG. 2B is a second step, FIG. 2C is a third step,
FIG. 2D is an axial sectional view of the fourth step. In the first step, a flat plate formed of a magnetic material is press-formed into an intermediate shape as shown in FIG. 2A by two types of punches (not shown) facing in the axial direction (vertical direction in FIG. 2). You. In the second step, as shown in FIG. 2B, the folded portion 21a and the narrowed portion 21b are formed so as to be in contact with each other in the radial direction (horizontal direction in FIG. 2). At this time, the cylindrical portion 21 has a bottomed cylindrical shape. Although it is presented, it has a shape almost similar to a finished product. In the third step, as shown in FIG. 2 (c), the case portion 23 is thinned while the flange portion 22 is left, and the caulking portion 23a is further thinned and press-formed. 4th
In the process, the through hole 21c of the cylindrical portion 21 is formed by punching.
Is formed. After the fourth step, additional processing is performed as necessary according to the shape of the connector portion 15 and the like.

As described above, the fixed core 2 is formed by integrally press-forming the flange portion 22 while securing a desired cross-sectional area of the cylindrical portion 21. An extra finishing step such as a polishing step is not required. Further, since the thin case portion 23 can be integrally formed, the number of parts and the number of assembling steps can be reduced. Therefore, it is possible to provide an inexpensive and easily manufactured solenoid valve without impairing the fluid control performance due to the reciprocating movement of the plunger 7.

Next, the operation of the solenoid valve according to the embodiment of the present invention configured as described above will be described. When the coil 5 is not energized, as described above, the communication between the supply port 11d and the control port 11c is cut off, while the control port 11c and the drain port 11e are in communication. Fluid pressure is drain port 1
The drain pressure is 1e. In this state, the coil 5
When power is supplied to the magnetic circuit, a magnetic flux is generated in the above-described magnetic circuit, and the plunger 7 is attracted in the axial direction toward the cylindrical portion 21 of the fixed core 2 and moves rightward in FIG. 1 against the urging force of the spring 9. I do. As a result, the ball valve 10 is pushed by the fluid pressure from the supply port 11d, separates from the valve seat 12a and abuts on the valve seat 13a (moves rightward in FIG. 1). The port 11d is in communication with the drain port 11e and the control port 1
Communication with the control port 11c is interrupted, and the fluid pressure at the control port 11c is equal to the supply pressure at the supply port 11d. Therefore, the ON / OFF control of the fluid pressure of the control port 11c can be performed by turning ON / OFF the current value supplied to the coil 5. This makes it possible to control the pressure, flow rate, and the like of the fluid used for controlling the control target.

FIG. 3 is a main sectional view in the axial direction of a solenoid valve 101 according to a modification of the embodiment of the present invention. As shown in FIG. 3, the fixed core 102 includes a cylindrical portion 121 and a flange portion 12.
2 and is made of a magnetic material. Further, the cylindrical portion 121 is formed integrally with a lamination consisting of two layers of a folded portion 121a and a narrowed portion 121b in the radial direction, and secures a desired sectional area. The case 123 is formed of a magnetic material, and caulks and fixes the flange 122 and the valve housing member 11. In the modification shown in FIG. 3, the other configuration is the same as that of the embodiment shown in FIG. 1, and the same configuration is denoted by the same reference numeral as in FIG.

In the above embodiment, the electromagnetic three-way valve has been described. However, the present invention is not limited to the electromagnetic three-way valve, but can be applied to an electromagnetic two-way valve and the like.

[0024]

As described above, according to the present invention, without impairing the fluid control performance due to the reciprocating movement of the plunger,
An inexpensive and easily manufactured solenoid valve can be provided.

[Brief description of the drawings]

FIG. 1 is a main axial sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a view schematically showing a manufacturing process of a fixed core;
2A shows the first step, FIG. 2B shows the second step, and FIG.
FIG. 2D is an axial sectional view of the third step, and FIG.

FIG. 3 is a main axial sectional view of a solenoid valve according to a modification of the embodiment shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Fixed core 3 Bobbin 5 Coil 6 Yoke 7 Plunger 10 Ball valve (valve member) 11 Valve accommodating member 12, 13 Valve seat member 12a, 13a Valve seat 21 Cylindrical portion 21a Folding portion 21b Restricted portion 22 Flange portion 23 Case Department

Claims (3)

[Claims] 1. A fixed core, a plunger disposed to form a magnetic gap with the fixed core, and a valve member opposed to a valve seat and moved relative to the valve seat by movement of the plunger. An electromagnetic valve for causing the plunger to be attracted toward the fixed core by an electromagnetic force generated at the time of energization, wherein the fixed core has a cylindrical portion formed by being laminated in a radial direction. . 2. The solenoid valve according to claim 1, wherein the cylindrical portion is formed integrally with a two-layer laminate by press molding. 3. The solenoid valve according to claim 2, wherein the fixed core integrally has a case portion that covers a coil wound around a bobbin on an outer periphery of the cylindrical portion.