JPH06213356A - Solenoid valve and its manufacture - Google Patents

Abstract

PURPOSE:To establish a method of manufacturing a solenoid valve of such a structure as suitable for accurate setting of the dimension of the gap between a stationary core and moving core to determine the flow control characteristic of the solenoid valve, wherewith easiness and high producibility in manufacturing are ensured. CONSTITUTION:When the size of gap between a moving core 1 and stationary core 3 is to be set, the under-neck dimension H1 is decided previously, and the moving core 1 and a holder 1-a are fastened at a caulk part 1-c located opposite a spherical part 5. Therein the under-neck dimension H1 is obtained by a steep-equipped jig, and the dimension h1 on the stationary core side is measured, and solenoid valve is configured by selective combination from the moving core 1 of H1 prepared in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a solenoid valve for controlling a fluid pressure of a ship, a vehicle, etc., and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a solenoid valve for controlling fluid pressure such as hydraulic pressure and atmospheric pressure, in particular, high pressure, high response (2) Solenoid structure which requires high responsiveness and accurate flow rate control, and a manufacturing method thereof. It has been developed and put into practical use.

FIG. 1 is a sectional structural view of a conventional solenoid valve. The holder 1-a is mounted inside the movable iron core 1, and the spherical portion 5 is fixed to the tip of the holder 1-a.
A seat portion 6 having a seat surface 10 is mounted inside the fixed iron core 3. The sphere portion 5 and the seat surface 10 are arranged so as to face each other, and when the coil 2 is not energized, the seat surface 10 and the sphere portion 5 are opened by the return spring 4, and therefore,
The spherical portion 5 and the sheet surface 10 are also in the open state, and the fluid passage 7 in the seat portion 6 forms the fluid passage 8 in the movable iron core 1 to flow the fluid. Next, when the coil 2 is energized, the sheet surface 10
The spherical portion 5 is closed, and therefore the spherical portion 5 and the seat surface 10 are also closed, and the fluid passages 7 and 8 are cut off.

In such a solenoid valve,
In order to provide highly accurate flow rate control characteristics, it is an important issue to secure the dimensional accuracy of the gap between the sheet surface 10 and the spherical portion 5, that is, the gap 9.

To form the gap 9, the movable iron core 1 and the holder 1-a are temporarily fixed by adhering an adhesive, lightly press-fitting, etc., and then a washer (not shown) having a predetermined gap size is fitted in the gap position to temporarily fix it. The fixed movable iron core 1 is mounted, and the spherical portion 5 is brought into contact with the sheet surface 10 for positioning. After that, the movable iron core 1 is taken out again, and the caulked portion 1-b is formed and fixed at a position close to the spherical portion 5. Further, after removing the washer for setting the gap size, the solenoid valve is assembled.

[0006]

As described above, the problems to be solved are, as mentioned above, the positioning between the movable iron core and the holder is troublesome in setting the gap size that determines the flow rate control characteristic, and (3) the washer is used. It is not a manufacturing means and structure for mass production, such as requiring fitting. Further, since the movable iron core and the holder are temporarily fixed, a post-process of cleaning is required when using the adhesive.
Furthermore, the difficulty of caulking work in the vicinity of the spherical portion and the resulting dimensional deviation are likely to occur. Etc.

[0007]

According to the present invention, (1) a movable iron core having a built-in holder having a spherical portion at its tip, a fixed iron core having a seat having a sheet surface, a coil, a return spring, etc. In a solenoid valve that opens and closes the fluid path in the seat and the movable core by the coil excitation and the return spring operation, the spherical part and the seat surface are arranged facing each other. The dimension of the movable iron core when obtaining the specified gap is determined by predetermining the under-neck dimension between the suction surface and the tip of the spherical body, and is fixed to the holder so that the movable iron core has a caulking portion on the side opposite to the spherical body. Solenoid valve characterized by (2) Prepare a movable iron core in which the under-neck dimension is set stepwise, and when assembling the solenoid valve, set the distance between the attraction surface of the fixed iron core and the expected position of the tip of the sphere when the seat surface is closed. A method for manufacturing a solenoid valve according to the above item (1), wherein a movable iron core having a neck size corresponding to a value obtained by measuring and adding a predetermined gap size is selected and configured. (3) When setting the under-neck dimensions, position the holder part including the spherical part with a stepping jig, and press the caulking blade axially to the part of the movable iron core opposite to the spherical part to form the caulking part. The method for manufacturing a solenoid valve according to the above item (1), characterized in that the solenoid valve is fixed. As a result, a structure and a manufacturing method that can accurately, easily, and highly productively set the gap between the movable iron core and the fixed iron core of the solenoid valve suitable for highly accurate flow rate control are realized.

[0008]

【Example】

(4) FIG. 2 is a cross-sectional structural view of the essential parts showing an embodiment of the present invention.
FIG. 3 is a manufacturing process diagram of the movable core of the present invention. The same reference numerals as those in FIG. 1 denote the same parts.

As shown in FIG. 3, the holder 1-a is slidably inserted into the hollow portion of the movable iron core 1, and the spherical portion 5 of the holder 1a is positioned in the recess 11-a of the step jig 11. . Since the lower end of the movable iron core 1 is located at the upper end of the stepping jig 11, the necked dimension H1 is set between the lower end of 1, ie, the suction surface and the tip of the spherical portion 5 (the lower end in FIG. 3). .

Then, the stepped caulking portion 1-C of the movable iron core 1 on the side opposite to the spherical portion 5 is axially (downward in FIG. 3) pressed by an unillustrated caulking blade to move the iron core 1 and the holder 1. -Fix a. Also, in order to strengthen the adhesion, 1
After fixing the -c portion, an auxiliary crimp portion may be further formed in the 1-b portion. (In FIG. 2, caulking is also fixed to the 1-b portion.)

On the other hand, the attracting surface of the fixed iron core 3 and the sheet surface 10
The distance h1 between the predicted positions of the tip of the spherical portion 5 at the time of closing can be limited to a dimensional range by the component dimensional tolerance of the fixed iron core 3 and the sheet portion 6, and can be classified into classes during mass production.

To set the size of the gap 9 to a,
By measuring the distance h1, the in-head dimension H1 =
A movable iron core of h1 + a is selected and each part is assembled to obtain a solenoid valve having a predetermined gap size a. Therefore, the movable iron core 1 in which the under-neck dimension H1 is classified in stages
Further, the fixed iron core 3 having the above-mentioned distance h1 that has been mass-produced is selectively combined to manufacture individual solenoid valves, and a product having the gap dimension a within the allowable dimension tolerance is obtained. Although the mass production of the solenoid valve in which the gap dimension a is substantially constant has been described, it is possible to set an arbitrary gap dimension by selecting the under-neck dimension H1 (5).

In the conventional fixing of the movable core and the holder, after the temporary fixing, the deviation due to the caulking work is avoided as much as possible.
Although the caulking portion is provided in the vicinity of the spherical portion, in the structure of the present invention, positioning by setting the under-neck dimension H1 and fixing by caulking work at the caulking portion 1-c can be performed in the same process by the step jig 11. . That is, the caulking blade 1-c provided on the movable iron core 1 on the opposite side of the sphere portion 5 is fixed by axially pressing and fixing the caulking blade to prevent the deviation of the under-neck dimension H1 and facilitate the caulking work. To do.

Further, the height of the recess 11-a of the stepping jig 11 can be machined with a tolerance of micron order, and therefore, the under-neck dimension H1 of the movable iron core can also be set stepwise in micron order. A highly accurate gap 9 is obtained for any of the distances h1 on the fixed iron core 3 side within the dimensional tolerance range.

Modifications, additions, deletions, conversions and other changes to the structure and the manufacturing method of the present invention are included in the scope of the present invention within the scope of the gist of the present invention.

[0016]

As described above, when the predetermined gap is obtained, the under-neck size is predetermined, and the movable iron core and the holder are fixed to each other by the caulking portion on the side opposite to the spherical portion, and the stepping jig provides high accuracy. Between the movable core and the fixed core of the solenoid valve suitable for high-precision flow control by obtaining the under-neck size of the solenoid valve and selecting and combining the movable core with the prepared in-head size from the dimension measurement on the fixed core side. Since a solenoid valve and a manufacturing method therefor capable of accurately, easily and highly producting the gap setting can be realized, it has a great industrial application effect as a solenoid valve for controlling fluid pressure such as hydraulic pressure and atmospheric pressure of ships and vehicles. Is.

[Brief description of drawings]

FIG. 1 is a sectional structure view of a conventional solenoid valve.

FIG. 2 is a cross-sectional structural view of a main part showing an embodiment of the present invention.

FIG. 3 is a manufacturing process diagram of the movable core of the present invention.

[Explanation of symbols]

1 Movable iron core 1-a Holder 1-b Caulking part (sphere part side) 1-c Caulking part (opposite to the sphere part) 2 Coil 3 Fixed iron core 4 Return spring 5 Sphere part 6 Seat part 7 Fluid path -Inside part) 8 Fluid path (in movable iron core) 9 Gap 10 Sheet surface 11 Step jig 11-a 11 concave part h1 Distance between suction surface of h3 and 10 5 pre-planned positions when closed H1 With neck Size

Claims (3)

[Claims] 1. A movable iron core having a holder having a spherical portion at its tip, a fixed iron core having a sheet portion having a seat surface, a coil, a return spring, and the like. In a solenoid valve that is placed facing each other and that opens and closes the fluid path between the seat and the movable core by the coil excitation and return spring operation, the dimensions of the movable core when a predetermined gap is obtained between the movable core and the fixed core. A solenoid valve characterized in that a setting is made such that an under-neck dimension between a suction surface and a tip of a spherical body portion is predetermined, and the movable iron core is fixed to a holder so as to have a caulking portion on a side opposite to the spherical body portion. 2. A movable iron core having a stepwise set under neck dimension is prepared in advance, and when the solenoid valve is assembled,
Measure the distance between the suction surface of the fixed iron core and the planned position of the tip of the sphere when the seat surface is closed, and select the movable iron core with the under-neck size equivalent to the value obtained by adding the specified gap size to this. The method for manufacturing a solenoid valve according to claim 1, wherein the method is configured. 3. In setting the under-neck dimension, the holder portion including the spherical portion is positioned by a stepping jig, and a caulking blade is axially pressed against a portion of the movable core opposite to the spherical portion to crimp the portion. The method for manufacturing a solenoid valve according to claim 1, wherein the solenoid valve is formed and fixed.