JP2000230658A - Assembling method of solenoid valve - Google Patents

Abstract

(57) Abstract: One end of a plunger is fixed to the center of a leaf spring, and the plunger is freely supported in the axial direction by elastic deformation of the leaf spring. The present invention provides a method of assembling an electromagnetic valve in which the plunger can be easily centered with high accuracy. SOLUTION: A plunger 28 fitted into the inside of a yoke 16 in a fitting step 74 and fixed to the center of a disc-shaped spring 24 is urged in the axial direction by a biasing step 76 to form the disc-like shape. The spring 24 is concentrically deformed so as to be centered, and in the caulking step 78, the end of the yoke 16 is deformed by the caulking jig 72 in the centered state. Is fixed to the yoke 16 without maintaining the outer diameter of the disc-shaped spring 24, which is easily elastically deformed, at a high machining tolerance, and the plunger 2
The plunger 28 is assembled with high accuracy and easily centered without requiring much mounting accuracy to the disc-shaped spring 24 of FIG.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plunger disposed at an inner peripheral portion of an electromagnetic coil, wherein one end of the plunger is disposed at a central portion of a plate-like spring whose outer peripheral portion is fixed to a cylindrical yoke for housing the electromagnetic coil. The present invention relates to a method of assembling a solenoid valve of a type that is fixed so as to freely move in the axial direction.

[0002]

2. Description of the Related Art In a solenoid valve, a plunger (movable core) driven by an electromagnetic coil transmits thrust to a valve for switching a flow path, so that the solenoid valve is switched continuously or intermittently. It has become. And the plunger driven by the electromagnetic coil is
While being concentrically located on the inner peripheral portion of the electromagnetic coil, the axial movement of the electromagnetic coil is freely supported.

One type of the above-mentioned plunger support structure is to fix one end of a plunger to a central portion of a plate-like spring whose outer peripheral portion is fixed to a cylindrical yoke accommodating an electromagnetic coil. The plunger is supported to be freely movable in the axial direction. According to this, since at least one end of the plunger is movably supported by other members in a non-contact state, the sliding resistance and the hysteresis are significantly reduced, and the characteristics of the solenoid valve are stabilized. In particular, a so-called linear solenoid valve in which the output pressure is continuously changed by a slight movement of the plunger has such a great advantage.

[0004]

As described above, one end of the plunger is fixed to the center of the plate spring whose outer peripheral portion is fixed to the cylindrical yoke for accommodating the electromagnetic coil. With the conventional solenoid valve, the plunger is freely supported in the axial direction by the elastic deformation of the plunger, the plunger can be moved with high precision with a slight radial clearance to reduce magnetic resistance. However, it is difficult to maintain the outer diameter of the leaf spring, which is easily elastically deformed, at a high processing tolerance, and the mounting accuracy of the plunger to the leaf spring is also required. It was relatively difficult.

The present invention has been made in view of the above circumstances, and has as its object the purpose of fixing one end of a plunger to the center of a leaf spring and elastically deforming the leaf spring. An object of the present invention is to provide a method of assembling an electromagnetic valve in which a plunger can be easily centered with high accuracy in a solenoid valve whose movement in the axial center direction is freely supported.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention resides in that one end of a plunger disposed on the inner periphery of an electromagnetic coil accommodates the electromagnetic coil. A method of assembling a solenoid valve of a type in which an axial portion thereof is freely supported by being fixed to a central portion of a plate-like spring having an outer peripheral portion fixed to a cylindrical yoke, wherein (a) the plate A fitting step of inserting a plunger, one end of which is fixed to the center of the spring, into the center of the electromagnetic coil, and fitting the outer periphery of the leaf spring inside the yoke; (b) the fitting step By biasing the plunger fitted into the inside of the yoke and fixed to the center of the leaf spring in the axial direction to deform the leaf spring into a conical shape, the leaf spring is centered. And (c) the energizing step. By deforming the end portion of the yoke in the centering state, there an outer peripheral portion of the plate spring and a caulking step crimped to the yoke, to include.

[0007]

According to the first aspect of the invention, the plunger fitted into the yoke and fixed to the center of the plate spring in the fitting step is urged in the axial direction by the urging step. The plate-shaped spring is centered by being deformed in a conical shape, and the outer peripheral portion of the plate-shaped spring is caulked to the yoke by deforming the end of the yoke in the centered state by a caulking step. Because it is worn
Assembling in a state where the plunger is easily centered with high accuracy without maintaining the outer diameter of the plate spring, which is easily deformed elastically, at a high processing tolerance and without requiring much mounting accuracy of the plunger to the plate spring. Is done.

[0008]

According to a second aspect of the present invention, there is provided an electromagnetic coil in which one end of a plunger disposed on an inner peripheral portion of the electromagnetic coil houses the electromagnetic coil. A method of assembling a solenoid valve of a type in which an axial portion thereof is freely supported by being fixed to a central portion of a plate-like spring having an outer peripheral portion fixed to a cylindrical yoke, wherein (a) the plate A fitting step of inserting a plunger, one end of which is fixed to the center of the spring, into the center of the electromagnetic coil, and fitting the outer periphery of the leaf spring inside the yoke; (b) the fitting step (C) an urging step of urging the plunger fixed to the center of the plate spring fitted inside the yoke in the axial direction to deform the plate spring into a conical shape; The plunger is pushed in the axial direction by the urging process. A vibration step of vibrating the plunger in a state where the plate spring is deformed in a conical shape; and (d) deforming an end of the yoke in a state where the plate spring is centered by the biasing step and the vibration. And crimping the outer peripheral portion of the plate spring to the yoke.

[0009]

According to this configuration, the plunger fitted into the inside of the yoke and fixed to the center of the plate spring in the fitting step is urged in the axial direction by the urging step. The plate-shaped spring is centered by being deformed in a conical shape, and in a vibration step, the plate-shaped spring urged in the axial direction by the urging step and vibrated in a conical shape is vibrated. The outer periphery of the plate spring is caulked to the yoke by deforming the end of the yoke in the centered state by the caulking step in the caulking step, so that the plate spring is easily elastically deformed. The plunger is assembled with high accuracy and easily centered without maintaining the outer diameter of the plunger to a high machining tolerance and without requiring much mounting accuracy of the plunger to the leaf spring. .

[0010]

According to a third aspect of the present invention, there is provided an electromagnetic coil, wherein one end of a plunger disposed on an inner peripheral portion of the electromagnetic coil houses the electromagnetic coil. A method of assembling a solenoid valve of a type in which an axial portion thereof is freely supported by being fixed to a central portion of a plate-like spring having an outer peripheral portion fixed to a cylindrical yoke, wherein (a) the plate A fitting step of inserting a plunger having one end fixed to the center of the spring into the center of the electromagnetic coil, and fitting the outer periphery of the plate spring inside the yoke; A jig mounting step of centering the plate-shaped spring by using a positioning jig through which a spring is inserted and engaging with an end of the plunger; and (c) a state where the jig is mounted by the jig mounting step. The leaf spring is formed by deforming the end of the yoke. A step of crimped outer peripheral portion to the yoke, is meant to include.

[0011]

According to the third aspect of the present invention, the plunger fitted into the inside of the yoke in the fitting step and fixed to the central portion of the plate-like spring can be inserted through the plate-like spring in the jig mounting step. In a state where the plate-shaped spring is centered by using a positioning jig that engages with the end of the plunger, the end of the yoke is deformed by a caulking step, so that the outer periphery of the plate-shaped spring becomes a yoke. Since the outer diameter of the leaf spring, which is easily deformed elastically, is maintained at a high machining tolerance, and the mounting accuracy of the plunger with respect to the leaf spring is not so required, the plunger can be easily and accurately mounted. Assembled in the centered state.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an electromagnetic valve according to an embodiment of the present invention, which is a linear solenoid valve 10 used for hydraulic control of an automatic transmission for a vehicle, for example, line pressure control or shift transient pressure control.
Is shown. The linear solenoid valve 10 includes a linear solenoid unit 12 that electromagnetically generates a thrust F _I having a magnitude corresponding to a drive current I _SOL from a control device (not shown).
And a valve section 14 that performs a pressure adjustment operation based on the thrust F _I of the linear solenoid section 12 to output a hydraulic signal pressure P _OUT having a magnitude corresponding to the drive current I _SOL .

The linear solenoid portion 12 includes a cylindrical coil 18 housed concentrically within a cylindrical yoke 16, a core member 20 swaged in the end of the yoke 16 on the valve portion 14 side, and Valve part 1 of the yoke 16
A disk-shaped cover member 22 which is swaged in the end opposite to the fourth side so as to close the opening, and a circle whose outer peripheral portion is swaged together with the cover member 22 to the yoke 16 via a shim 23. A plate spring 24 and a shaft 2 whose one end is fixed to a center portion of the disk spring 24 using a caulking ring 25 and protrudes from the other end in the axial direction.
6 with a plunger 28. The core member 20 is formed with a through hole 30 penetrating in the axial direction, and the shaft 26 is slidably fitted into a guide bush 32 fitted in the through hole 30. The plunger 28 is supported movably in the axial direction, that is, in the longitudinal direction thereof, with a small gap formed in the outer periphery thereof. A projection 34 protruding in a conical shape and a hole 36 for receiving the projection 34 are formed on the opposing surface (end surface) of the plunger 28 and the guide bush 32, and the projection 34 is substantially fitted into the hole 36. A stopper 38 is fixed to the shaft 26 so as to abut the bottom wall of the hole 36 in order to prevent any further approach in a state where the shaft 38 is in a closed state.

When the exciting current I _SOL is supplied to the terminal 39 of the cylindrical coil 18, a magnetic circuit shown by a broken line is formed, and a magnetic attraction in a direction in which the gap G formed in the magnetic circuit is eliminated. Force is generated. This allows
Plunger 28 supported movably in the axial direction
The thrust F _I having a magnitude corresponding to the excitation current I _SOL [=
f (I _SOL )] is generated and output to the valve section 14 via the shaft 26. The plunger 28 is supported movably in the axial direction with a small gap formed on the outer periphery thereof. However, in order to reduce the magnetic resistance of the magnetic circuit and increase the driving efficiency, the plunger is allowed to move. It is desirable to be as small as possible.

The valve portion 14 has a cylindrical valve housing 40 fixed to the core member 20 or the yoke 16.
And an input port 42, an output port 44, a feedback port 46 provided in the valve housing 40.
A spool valve 50 slidably provided in a concentric position with the shaft 26 in contact with the shaft 26 to open and close the drain port 48 and the input port 42 and the output port 44; And a return spring 52 for generating an urging force W _SLT for urging the valve element 50 in the valve closing direction. A thrust F _I from the linear solenoid portion 12 is applied to the spool valve element 50 via the shaft 26. It is provided in the valve opening direction.

The output pressure P from the output port 44 is
_OUTIs an external feedback oil passage L as shown in FIG.
_FBAlternatively, the feedback
And the output pressure P
_OUTThrust P in the valve closing direction based on _OUT・ A_SLTBut spoo
The valve 50 is made to act. Sand
The spool valve 50 has a linear solenoid 12 side.
From the first land 54, the first land 54 having the same diameter as the first land 54.
2 lines 56, first land 54 and second land 56
A third land 58 having a smaller diameter than that of the second land is provided.
The space between the land 56 and the third land 58 is
Feedback oil chamber 60 communicating with the back port 46
Functioning as Therefore, it contributes to the valve closing direction
The area of the annular pressure receiving surface of the second land 56 which is the pressure receiving surface (the
The cross-sectional area of the second land 56 minus the cross-sectional area of the third land 58) is A
_SLTThen, the output is calculated so that the equilibrium equation of equation (1) is established.
Force P_OUTIs the excitation current I_SOLLinear solenoid determined by
Thrust F_I[= F (I_SOL)] Generated according to
Can be done.

[0018]

P _OUT = F _I / A _SLT -W _SLT / A _SLT (1)

Here, in the linear solenoid valve 10 configured as described above, the plunger 28 in the linear solenoid portion 12 is supported movably in the axial direction with a small gap formed in the outer periphery. However, a major problem is how to accurately mount the plunger 28 in the linear solenoid portion 12 at the center position, that is, at the axial center position. This is because if the above-mentioned small gap comes into contact due to the misalignment of the plunger 28, the valve characteristics of the output pressure P _OUT obtained with respect to the exciting current I _SOL vary, or the hysteresis increases.

Therefore, it is conceivable that the outer diameter tolerance of the disc-shaped spring 24 in which one end of the plunger 28 is fixed at the center and the inner diameter tolerance of the yoke 16 into which the disc-shaped spring 24 is fitted are strictly controlled. . However, in particular, as shown in FIG. 2, for example, the disc-shaped spring 24 is provided between an outer peripheral edge 64 that is caulked to the yoke 16 and an inner peripheral edge 66 that is caulked to the plunger 28.
Since a plurality of elongated holes 68 having a complicated shape directed in one circumferential direction from the inner peripheral side toward the outer peripheral side are usually formed by punching, it is difficult to tighten the above-mentioned tolerance. is there. Further, the disc-shaped spring 24
Is relatively soft, so plunger 2
It is difficult to accurately attach the plunger 28 to the axial center position of the linear solenoid portion 12 because, for example, the plunger 28 is easily tilted, or the mounting accuracy (coaxiality) between the plunger 28 and the disc-shaped spring 24 is required. Had become.

Hereinafter, the assembling method of this embodiment will be described with reference to FIGS. First, a cylindrical coil 18 (coil sub-assembly, coil S / A) on which the yoke 16 and the core member 20 are mounted is prepared on a predetermined mounting table, and is used for driving the cylindrical coil 18. A drive circuit 70 and a caulking jig 72 are prepared. Next, in an insertion step, ie, a fitting step 74, the plunger 28 having one end fixed to the center of the disc-shaped spring 24 is inserted into the center of the cylindrical coil 18, and the outer periphery of the disc-shaped spring 24 is The yoke 16 is fitted inside. In the energizing step 76, the drive circuit 70
When the exciting current is supplied to the cylindrical coil 18, the plunger 28 fixed to the center of the disc-shaped spring 24 fitted inside the yoke 16 in the fitting step 74 is moved to near its maximum stroke. The stopper 38 is urged toward the valve portion 14 in the axial direction until the stopper 38 substantially contacts the core member 20. As a result, the disc-shaped spring 24 is deformed into a conical shape as shown in FIG.
The eight projections 34 are centered with respect to the yoke 16 by being fitted into the holes 36 of the core member 20. FIG. 4 shows this state. In the caulking step 78, the upper end of the yoke 16 is deformed by the caulking jig 72 while being centered by the urging step 76, so that the outer peripheral portion of the disc-shaped spring 24 is caulked to the yoke 16. . FIG. 1 shows this state.

As described above, according to the present embodiment, the plunger 28 fitted into the yoke 16 in the fitting step 74 and fixed to the center of the disc-shaped spring 24 is
The disk spring 24 is urged in the axial direction by the urging step 76 to be concentrically deformed, and is centered by the caulking step 78. By being deformed by the caulking jig 72, the outer peripheral portion of the disc-shaped spring 24 is caulked to the yoke 16, so that the outer diameter of the disc-shaped spring 24 that is easily elastically deformed is maintained at a high processing tolerance. The plunger 28 is assembled with high accuracy and easily centered without requiring much mounting accuracy of the plunger 28 to the disc-shaped spring 24.

In this embodiment, in the urging step 76, the plunger 28 is urged toward the valve portion 14 in the axial direction until the stopper 38 substantially contacts the core member 20. Of the core member 20
Also, the plunger 28 can be more accurately assembled because it is centered with respect to the yoke 16 by being fitted into the hole 36. .

Next, another embodiment of the present invention will be described. In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the embodiment shown in FIGS. 6 and 7, first, the cylindrical coil 18 (coil sub-assembly, coil S / A) on which the yoke 16 and the core member 20 are mounted is placed on a predetermined mounting table. In addition, a driving coil 80, a driving circuit 82 for driving the driving coil 80, and a caulking jig 72 are prepared. Then
In the fitting step 74, the plunger 28 having one end fixed to the center of the disc-shaped spring 24 is inserted into the center of the cylindrical coil 18, and the disc-shaped spring 24
Is fitted inside the yoke 16. In the subsequent vibration step 84, the drive circuit 82 supplies an excitation current having a frequency of, for example, about several tens of hertz to the drive coil 80, so that the disc-shaped spring fitted inside the yoke 16 in the fitting step 74 The plunger 28 fixed to the center of the 24 is vibrated.
Simultaneously with or before the vibration step 84 or before or after the vibration step 84, in a biasing step 86, the drive coil 80 is excited with a predetermined current value and fitted inside the yoke 16. The plunger 28 fixed to the center of the disc-shaped spring 24 inserted is sucked by the drive coil 80 toward the valve portion 14 in the axial direction. As a result, the disk spring 24 is vibrated and deformed in a conical shape as shown in FIG. FIG. 7 shows this state. In the caulking step 78, the upper end of the yoke 16 is deformed by the caulking jig 72 while being centered by the urging step 86, so that the outer peripheral portion of the disc-shaped spring 24 is caulked to the yoke 16. . FIG. 1 shows this state.

As described above, according to this embodiment, the plunger 28 fitted into the yoke 16 in the fitting step 74 and fixed to the center of the disc-shaped spring 24 is
The disc spring 24 is concentrically deformed by being urged in the axial direction by the urging step 86 to be centered. The vibrating step 84 urges the disc spring 24 in the axial direction by the urging step 86. The disc-shaped spring 24 that has been deformed into a conical shape is further centered by being vibrated, and the end of the yoke 16 is deformed in the centered state by the caulking step 78, whereby the above-described circle is formed. Since the outer peripheral portion of the plate spring 24 is swaged to the yoke 16, the outer diameter of the plate spring that is easily elastically deformed is not maintained at a high processing tolerance, and the mounting accuracy of the plunger 28 to the disk spring 24 is improved. And the plunger 28 is assembled with high accuracy and easily centered.

In the embodiment shown in FIGS. 8 to 10, first, a cylindrical coil 18 (coil sub-assembly, coil S / A) on which the yoke 16 and the core member 20 are mounted is placed on a predetermined mounting table. At the same time, the positioning jig 90 is prepared. The positioning jig 90 is provided with, for example, three claws 92 that fit through the elongated hole 68 of the disc-shaped spring 24 and are fitted into the gap between the plunger 28 and the yoke 16. Next, the fitting step 7
4, a plunger 28 having one end fixed to the center of the disc-shaped spring 24 is inserted into the center of the cylindrical coil 18, and the outer periphery of the disc-shaped spring 24 is moved toward the inside of the yoke 16. Can be fitted. In the subsequent jig mounting step 94, as shown in FIG. 10, the three claws 92 are inserted into the positions shown by the broken lines in FIG. 9 and the claws 92 are inserted into the gap between the plunger 28 and the yoke 16. By engaging the disk spring 24 and the plunger 2
8 is positioned with respect to yoke 16. Next, in a leaf spring caulking step 96, a part of the outer peripheral edge of the yoke 16 is deformed using a caulking jig, so that the disk spring 24 centered by the above positioning is caulked to the yoke 16. You. Then, after the positioning jig 90 is removed in the jig removing step 98, in the cover caulking step 100, a portion of the outer peripheral edge of the yoke 16 that has not yet been deformed is deformed using the caulking jig. As a result, the cover 22 is swaged.

According to this embodiment, the fitting step 74
Disc-shaped spring 24 fitted inside yoke 16
The plunger 28 fixed to the center of the plunger 28 is inserted into the elongated hole 68 of the disc-shaped spring 24 and engages with the end of the plunger 28 in the jig mounting step 94.
The end of the yoke 16 is deformed in a leaf spring caulking step 96 in a state where the disc spring 24 is centered by using the above, so that the outer peripheral portion of the disc spring 24 is caulked to the yoke 16. Therefore, the outer diameter of the disc-shaped spring 24, which is easily elastically deformed, is not maintained at a high machining tolerance, and the plunger 28 has a high precision without requiring much mounting accuracy of the plunger 28 to the disc-shaped spring 24. Assembled in an easily centered state.

While the embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, in the embodiment shown in FIGS. 3 and 4, the cylindrical coil 18 is excited by the drive circuit 70 in order to urge the center of the disc-shaped spring 24 in the axial direction. For example, another coil that attracts and urges the shaft 26 may be used, or the center of the disc-shaped spring 24 may be urged in the axial direction by a rod of an air cylinder.

In the above-described embodiments of FIGS. 6 and 7, the drive coil 80 is excited by the drive circuit 82. However, the cylindrical coil 18 is excited by the drive circuit 82, so that the disc-shaped spring is excited. The center of 24 may be urged and vibrated in the axial direction.

In the above-described embodiment, the linear solenoid valve 10 has been described. However, an electromagnetic valve or the like which is driven on and off may be used. In short, one end of the plunger 28 disposed on the inner peripheral portion of the cylindrical coil 18 is connected to the cylindrical yoke 1 for accommodating the cylindrical coil 18.
The solenoid valve may be of a type that is fixed to the center of a disk-shaped spring 24 having an outer peripheral portion fixed to the outer peripheral portion 6 so as to freely move in the axial direction.

The above description is merely an embodiment of the present invention, and the present invention can be variously modified without departing from the gist of the present invention.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a linear solenoid valve which is an electromagnetic valve according to an embodiment of the present invention.

FIG. 2 is a front view illustrating a shape of a disc-shaped spring supporting a plunger in the linear solenoid valve of FIG. 1;

FIG. 3 is a process diagram illustrating a main part of an assembly (manufacturing) process of the linear solenoid valve of FIG. 1;

FIG. 4 is a view for explaining an urging step and a caulking step in FIG. 1;

FIG. 5 is a view illustrating a centering action of a disc-shaped spring deformed conically with respect to a yoke in the urging step of FIG. 1;

FIG. 6 is a process diagram illustrating a main part of an assembly (manufacturing) process of a linear solenoid valve according to another embodiment of the present invention.
FIG.

FIG. 7 is a view for explaining an energizing step, a vibration step, and a caulking step in FIG. 6, and is a view corresponding to FIG. 4;

FIG. 8 is a process diagram illustrating a main part of an assembly (manufacturing) process of a linear solenoid valve according to another embodiment of the present invention.
FIG.

9 is a view for explaining the jig mounting step of FIG. 8, and is a view showing a portion of the disc-shaped spring into which the pawl of the positioning jig is inserted.

FIG. 10 is a view for explaining the jig mounting step of FIG. 8;
It is a figure explaining the state where the positioning jig was attached.

[Explanation of symbols]

 10: Linear solenoid valve (electromagnetic valve) 16: Yoke 18: Cylindrical coil (electromagnetic coil) 24: Disc spring (plate spring) 28: Plunger 74: Fitting process 76, 86: Energizing process 78: Caulking process 84: Vibration process 90: Positioning jig 94: Jig mounting process

Continued on the front page. (72) Inventor Hitoshi Goto 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 3H106 DA13 DA23 DB02 DB12 DB23 DB32 DC09 DC18 DD05 EE24 EE35 GA22 GA23 JJ02 JJ05

Claims (3)

[Claims] An end of a plunger disposed on an inner peripheral portion of an electromagnetic coil is fixed to a central portion of a plate-like spring having an outer peripheral portion fixed to a cylindrical yoke for housing the electromagnetic coil. A method of assembling a solenoid valve of a type that is freely supported in an axial direction, wherein a plunger having one end fixed to a center of the plate-shaped spring is inserted into a center of the electromagnetic coil, and A fitting step of fitting the outer peripheral portion of the leaf spring inside the yoke, and urging the plunger fixed to the center of the leaf spring fitted inside the yoke by the fitting step in the axial direction of the plunger. Then, by deforming the plate spring into a conical shape, a biasing step of centering the plate spring, and by deforming the end of the yoke in a state of being centered by the biasing step, The outer peripheral portion of the leaf spring is attached to the yoke. A method for assembling a solenoid valve, comprising a step of caulking. 2. One end of a plunger disposed on an inner peripheral portion of an electromagnetic coil is fixed to a central portion of a plate-like spring having an outer peripheral portion fixed to a cylindrical yoke for housing the electromagnetic coil. A method of assembling a solenoid valve of a type that is freely supported in an axial direction, wherein a plunger having one end fixed to a center of the plate-shaped spring is inserted into a center of the electromagnetic coil, and A fitting step of fitting the outer peripheral portion of the leaf spring inside the yoke, and urging the plunger fixed to the center of the leaf spring fitted inside the yoke by the fitting step in the axial direction of the plunger. An urging step of deforming the leaf spring in a conical shape, and the plunger is urged in the axial direction by the urging step to deform the leaf spring conically. Vibrating step of vibrating; And crimping the outer periphery of the plate spring to the yoke by deforming the end of the yoke while being centered by vibration. . 3. An end of a plunger disposed on an inner peripheral portion of an electromagnetic coil is fixed to a central portion of a plate-like spring having an outer peripheral portion fixed to a cylindrical yoke accommodating the electromagnetic coil. A method of assembling a solenoid valve of a type that is freely supported in an axial direction, wherein a plunger having one end fixed to a center of the plate-shaped spring is inserted into a center of the electromagnetic coil, and A fitting step of fitting an outer peripheral portion of the leaf spring into the inside of the yoke; and centering the leaf spring by using a positioning jig that penetrates the leaf spring and engages with an end of the plunger. A jig mounting step, and a caulking step of caulking an outer peripheral portion of the plate spring to the yoke by deforming an end of the yoke in a state where the yoke is centered in the jig mounting step. Characteristic method of assembling a solenoid valve.