JP3143407B2 - Electromagnetic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device having a solenoid stator in which a plurality of magnetic plates are spirally stacked.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a stator for a solenoid in which a plurality of magnetic plates having a uniform thickness are spirally laminated (for example, Japanese Patent Application Laid-Open No. 4-365305).
No.). FIG. 15 shows a part (a stator assembly 40) of an electromagnetic device (solenoid valve) using the solenoid stator.
2 is a cross-sectional view of a main part showing the configuration of FIG. In the stator assembly 40 shown in FIG.
A coil 43 is wound around the armature, and a push rod 45 connected to an armature 46 is slidably disposed in a through hole 44 at the center of the stator 41. In this case, when the coil 43 is energized, the armature 46 is attracted to the magnetic pole surface (the upper surface in the figure) of the stator 41 and the push rod 4
The valve body (not shown) connected to the lower end of 5 opens or closes.

However, in the above technique, when the coil is energized, the stator 41 and the armature 46 attract each other by a magnetic force, so that a problem that the stator 41 is lifted and displaced may be caused.

On the other hand, a technique for preventing a solenoid stator from floating in an electromagnetic valve has been proposed in Japanese Patent Application Laid-Open No. Hei 3-125086, entitled "Static Support Structure for Solenoid Valve". In other words, in the technique described in the publication, the stator is formed by laminating E-shaped magnetic plates, and the peripheral surface of the stator is pressed and supported by an annular support member. More specifically, as shown in FIG.
The stator 50 has a thin magnetic plate 51 laminated at the left and right positions and a thick plate 52 arranged at the center, and is formed in a substantially columnar shape as a whole. The plate 52 has a through hole 53 for inserting a push rod.

FIGS. 17 (a) and 17 (b) are a plan view and a longitudinal sectional view showing a state where the coil 55, the armature 56 and the like are assembled to the stator 50 (for convenience, FIG. 17 (a) shows an armature). 56 is omitted). As shown in FIG.
The support member 54 presses the peripheral portion of the stator 50 (both ends of all the magnetic plates 51 and 52). In such a case, the stator 50 and the armature 56 act to attract each other by energizing the coil 55, but the displacement of the stator 50 is prevented because the support member 54 presses and supports the stator 50.

[0006]

However, the above-mentioned prior art has the following problems. In other words, according to the stator support structure described in the above publication (Japanese Unexamined Patent Publication (Kokai) No. 3-1-25866), when a flat plate of magnetic material is laminated, both ends of the magnetic plate are supported. Therefore, in the case of a stator in which a large number of plates are spirally stacked (a stator as disclosed in Japanese Patent Application Laid-Open No. 4-365305), a sufficient effect of preventing displacement can be obtained. Could not. That is, in the case of a stator in which a number of magnetic plates are spirally stacked,
Insufficient support at the center of the stator may cause lifting at the center of the stator, causing problems such as protruding displacement. In particular, when the center of the stator rises,
The air gap formed between the stator and the armature changed so as to be small, which had a great effect on the performance of the solenoid valve and the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an electromagnetic device having a solenoid stator in which a plurality of magnetic plates are spirally stacked. An object of the present invention is to provide an electromagnetic device that can surely prevent the occurrence of the electromagnetic wave.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a first position regulating means for regulating a position of a plate of a magnetic body on a center side of a stator in a stator axial direction. And a second position restricting means for restricting the position of the magnetic plate in the stator axial direction on the outer peripheral side of the stator. In such a case, since the first and second position regulating means regulate the position of both the center and outer periphery of the stator in the axial direction of the stator, it is possible to prevent the plate of the magnetic body from being lifted up and to surely prevent the deformation of the stator. Can be.

In this case, as described in claim 2, the second position restricting means has a configuration in which a peripheral portion is pressed against a magnetic pole surface facing the armature.
The above-described effects (especially, the effect of preventing change in the outer peripheral portion of the stator) can be realized more easily.

According to the third aspect of the present invention, the first position restricting means has a contact portion abutting on the opposite surface of the magnetic pole surface facing the armature, and from the contact portion to the through hole at the center of the stator. The gist of the invention is to have a position regulating portion for regulating the position of the magnetic plate in the axial direction of the stator. In this case, the position restricting portion can prevent the magnetic material from being lifted particularly at the inner end face of the plate, and can more reliably prevent the deformation of the stator.

According to a third aspect of the present invention, there is provided: a cylinder or a shaft welded to an end face of the magnetic plate in a through hole of the stator. Wherein the position restricting portion has a locking portion which is locked to an end face of the plate of the magnetic body within the through hole of the stator, as described in claim 5. It is desirable.

Further, in the invention described in claim 6, the first position restricting means is in contact with an opposite surface of the magnetic pole surface facing the armature, and the plate of the magnetic material is provided in a through hole at the center of the stator. It is constructed by welding. Even in such a case, it is possible to prevent the magnetic material from floating on the inner end face of the plate, and to reliably prevent the deformation of the stator.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, a first embodiment in which an electromagnetic device of the present invention is embodied in an electromagnetic valve will be described with reference to the drawings. The solenoid valve according to the present embodiment is used as an electromagnetic fuel spill valve applied to a fuel injection pump of a diesel engine, and functions as a normally open valve (normally open valve). That is, when the solenoid coil is normally in the demagnetized state, the valve body is held at a position where the fuel passage is opened by the urging force of the urging member (spring). When the solenoid coil is excited, the valve body moves against the urging force of the urging member, and the fuel passage is closed.

FIG. 1 is a sectional view showing a schematic configuration of the solenoid valve 1. In FIG. 1, a solenoid housing 2 has a substantially cylindrical shape, and a screw portion 2a for assembling an electromagnetic valve 1 to a fuel injection pump (not shown) is formed on a lower outer peripheral surface thereof. A stator assembly 3 is provided inside the solenoid housing 2, and the stator assembly 3 has a stator for solenoid (hereinafter simply referred to as a stator) 4. The stator 4 has an annular coil insertion groove 5 opening upward in the figure, and the insertion groove 5 includes a coil 6.
Is wound. Further, a through hole 7 is formed in the center of the stator 4 so as to penetrate in the vertical direction in the figure.

Here, the configuration of the stator 4 is shown in FIGS.
This will be described with reference to FIG. The stator 4 has a laminated structure including a number of magnetic plates 8, and the shape of the plates 8 is shown in FIG. In FIG. 3, a silicon steel plate having a uniform thickness is used for the magnetic plate 8, and the silicon steel plate is formed by press punching to form a concave portion 8a and a whole curved shape. Then, the plate 8 is spirally arranged with respect to the center axis of the stator 4 with a jig or the like, and the outer periphery thereof is fixed in a circular shape, thereby forming the stator 4 shown in FIG.
Is produced. At this time, the coil insertion groove 5 is formed by the concave portion 8a of the plate 8.

In FIG. 1, a ring 9 is attached to the outer peripheral surface of the stator 4. When assembling the stator 4 and the ring 9, the spirally formed stator 4 is pressed into the inner peripheral surface of the ring 9 as described above.

On the other hand, a support 10 is attached to the stator 4 so as to contact the lower surface thereof and the through hole 7. The support 10 has a substantially T-shaped cross section, and includes a disk portion 10a having an outer diameter substantially equal to the outer diameter of the stator 4, and a cylindrical portion 10b extending upward from the center of the disk portion 10a. I have. A hole 10 c is formed in the center of the support 10. FIG. 4 is an exploded perspective view of the stator 4 and the support 10 as viewed from below (a surface different from the magnetic pole surface of the stator 4). In FIG. 4, the cylindrical portion 10b of the support 10
Is pressed into the through hole 7 of the stator 4. The support 1
At the time of press-fitting 0, the ring 9 may be assembled to the stator 4 after the support 10 is press-fitted to the stator 4,
Alternatively, the support 10 may be pressed into the stator 4 with the ring 9 attached to the stator 4.

As shown in FIG. 1, the length of the cylindrical portion 10b of the support 10 is slightly shorter than the height of the stator 4, and the upper end of the cylindrical portion 10b is fixed to the stator 4 by laser welding. (Welds are shown as W1).

A push rod 11 is provided in a hole 10c of the support 10 so as to be slidable in the vertical direction in the figure, and an armature 1 is provided at an upper end of the push rod 11.
2 are connected. The armature 12 is attracted to the upper surface (magnetic pole surface) of the stator 4 by a magnetic force generated when the coil 6 is energized.

Above the armature 12, there is provided a cap housing 13 which is in close contact with the inner peripheral surface of the solenoid housing 2, and the cap housing 13 has an annular circumferential portion 13a extending downward. The lower end surface of the circumferential portion 13a is in contact with the upper surface edge of the stator 4 and the upper surface of the ring 9. In such a case, the position of the cap housing 13 is fixed by screwing the lock nut 14 to the upper end of the solenoid housing 2, and the upper surface edge of the stator 4 and the peripheral portion 13 a of the cap housing 13 are fixed. The ring 9 is pressed and supported from above.

The cap housing 13 is provided with a signal input terminal 15 fixed by resin molding.
The signal input terminal 15 receives an external electric signal. The coil 6 is electrically connected to the signal input terminal 15 via a lead wire (not shown).

On the other hand, below the solenoid housing 2,
A valve housing 18 is assembled via a plate 17, and a valve body 19 for communicating or closing a fuel passage is provided in the valve housing 18. A sliding hole 20 for slidably holding the valve body 19 is formed in the valve housing 18, and the sliding hole 20 communicates with an annularly formed high-pressure fuel chamber 21. Further, fuel passages 22 a and 22 b communicating with the high-pressure fuel chamber 21 are formed in the valve housing 18. The valve element 19 is
It is connected to the lower end of the push rod 11 and is always urged by the compression coil spring 23 in the valve opening direction (upward in the figure).

In the present embodiment, the support 10 corresponds to the first position restricting means, and the circumferential portion 13a of the cap housing 13 corresponds to the second position restricting means. I do. Further, the disk portion 10a of the support 10 corresponds to a contact portion described in the claims, and the cylindrical portion 10b and the welded portion W1 correspond to a position regulating portion described in the claims.

Incidentally, in the present solenoid valve 1, since the high speed operation of the valve element 19 is required, the upper chamber Q1 and the lower chamber Q of the valve element 19 are required.
2 and the armature chamber Q3 as equal pressure (for example, fuel feed pressure supplied to the fuel injection pump).
(However, the illustration is omitted because the configuration is publicly known).

When assembling the stator assembly 3, the operation is performed as shown in FIGS. 5 and 6 (note that the lower surface of the support 10 is flattened for convenience in the following drawings). That is, as shown in FIG. 5, the ring 9 is attached to the outer periphery of the stator 4, and the support 10 is pressed into the through hole 7 of the stator 4 from below. Stator 4
A coil 6 is resin-molded in the coil insertion groove 5.
Then, an annular jig 25 is pressed against the upper surface edge of the stator 4 and the upper surface of the ring 9, and in this state, the support 10
Of the cylindrical portion 10b and the inner peripheral surface of the stator 4 (through holes 7).
Is welded by laser (the welded portion W1 in the figure). In such a case, the jig 25 corresponds to the cap housing 13 in FIG. At the time of the above laser welding, all the magnetic plates 8 constituting the stator 4
Is welded to the support 10.

The stator 4 is formed by the laser welding.
When the welding between the armature 12 and the support 10 is completed, the integral body of the push rod 11 and the armature 12 is inserted into the hole 10c of the support 10 from above as shown in FIG. Are arranged to face each other.

Returning again to the solenoid valve 1 of FIG. 1, the actual operation will be described. In the demagnetized state of the coil 6 (the state shown), a predetermined amount is set between the upper surface of the stator 4 and the lower surface of the armature 12. Is maintained, and the valve element 19 connected to the lower portion of the push rod 11 is held at a predetermined valve opening position. At this time, the upper part of the armature 12 abuts against a stopper (not shown), and the valve opening position of the valve body 19 is held in that state. That is, the fuel passages 22 a and 22 b communicate with each other via the high-pressure fuel chamber 21.

On the other hand, when an external electric signal is input to the signal input terminal 15 and the coil 6 is excited, the armature 12 is attracted to the stator 4, and the gap between the upper surface of the stator 4 and the lower surface of the armature 12 is formed. The air gap decreases. At this time, the valve element 1 is moved with the operation of the armature 12.
9 moves to the valve closing position. That is, the fuel passages 22a, 22
Communication of 2b is cut off. When the coil 6 is excited, the stator 4 (the magnetic plate 8) receives a force upward in the drawing due to the suction operation between the stator 4 and the armature 12, but the peripheral edge of the stator 4 is pressed downward by the cap housing 13. And the center of the stator 4 is the support 1
Since the stator 4 is fixedly supported, no displacement occurs such as the stator 4 being lifted.

As described above, according to the present embodiment, the stator 4
Although it has been described that the main object of the present invention can be achieved by preventing the displacement of the present invention, the additional effects obtained by the present embodiment will be listed below.

(A) In the present embodiment, the lock nut 14 is screwed to the upper end of the solenoid housing 2, and the cap housing 13 is pressed downward (downward in FIG. 1) by tightening the lock nut 14. As a result, the periphery of the stator 4 can be fixedly supported by an easy method and surely.

(B) In this embodiment, the ring 9 is attached to the outer periphery of the stator 4. For this reason, it is possible to prevent the stator 4 (the plate 8 of the magnetic material) configured by being spirally stacked from being deformed in the outer peripheral direction. Considering these effects (a) and (b), the position of both the center side and the outer peripheral side of the stator is regulated in the axial direction of the stator. As a result, the floating of the magnetic plate 8 can be prevented over the entire area. 4 can be reliably prevented.

(C) In the present embodiment, the stator 4 is formed by spirally laminating a number of magnetic plates 8, and in such a case, directional (or non-directional) silicon having good soft magnetic characteristics is used. Because of the use of steel sheet, the maximum magnetic flux density is high,
In addition, a stator 4 having a strong suction force can be provided.

(D) Since the displacement of the stator 4 can be prevented as described above, the performance of the solenoid valve 1 to which the stator 4 is assembled can be improved. That is,
When the stator 4 is displaced, for example, the armature 1
The air gap between the magnetic pole 2 and the pole face of the stator 4 is reduced, and the lift of the valve body 19 is reduced. In this case, the communication between the fuel passages 22a and 22b of the solenoid valve 1 cannot be completely shut off, which causes a problem in performance of the solenoid valve 1. However, according to the configuration of the present embodiment, the stator 4
Therefore, the performance of the solenoid valve 1 can be always maintained without causing the above-described problem.

Next, second to eighth embodiments of the present invention will be described with reference to the drawings. However, in each of the following embodiments, the same components as those in the above-described first embodiment will not be described, and the following embodiments will focus on the differences from the first embodiment. Will be described.

(Second Embodiment) FIG. 7 is a sectional view showing a configuration of a stator assembly 3 according to a second embodiment. In FIG. 7, a support 30 as a first position regulating means is constituted by a disk portion 30a and a cylindrical portion 30b manufactured separately from each other. That is, although the disc portion 30a and the cylindrical portion 30b are divided into two members, the step portions 30c and 30d formed on each are engaged with each other to integrate the two members 30a and 30b. The upper end of the cylindrical portion 30a is welded to the stator 4 (indicated by a weld W1). At the time of welding by laser welding, a jig 25 corresponding to the cap housing 13 of the electromagnetic valve 1 and the upper edge of the stator 4 and the ring 9 are used.
Is pressed down.

According to the present embodiment, the following effects can be obtained in addition to the effects described in the first embodiment. That is, since the support 30 is divided into the disk portion 30a and the cylindrical portion 30b, the machining of the material is facilitated as compared with the first embodiment in which the T-shaped support 10 is integrally formed. Workability in a machining process such as cutting is improved. In addition, since a portion cut off by machining can be reduced, material costs can be reduced, and costs can be reduced. Incidentally, in the present embodiment, the disc portion 30a corresponds to the contact portion described in the claims, and the cylindrical portion 30b and the welding portion W1
Corresponds to the position restricting portion described in the claims.

(Third Embodiment) FIG. 8 is a sectional view showing a configuration of a stator assembly 3 according to a third embodiment. In FIG. 8, the support 31 as the first position regulating means is composed of a disk portion 31a and a cylindrical portion 31b manufactured separately from each other, as in the second embodiment. A stepped portion 7a is formed at the upper end of the through hole 7 of the stator 4, and an enlarged diameter portion 31c is formed at the upper end of the cylindrical portion 31b of the support 31 so as to correspond to the stepped portion 7a. Further, with the cylindrical portion 31b inserted into the through hole 7, the lower end of the cylindrical portion 31b and the lower surface of the disk portion 31a are welded by laser welding, and the two members 31a and 31b are integrated (welding). Is indicated by W2). During the welding operation by laser welding, the upper edge of the stator 4 and the upper surface of the ring 9 are pressed by a jig 25 corresponding to the cap housing 13 of the solenoid valve 1.

Also in the case of the present embodiment, the first
Not only the effects described in the second embodiment can be obtained, but also effects such as simplification of machining and cost reduction can be obtained as described in the second embodiment.
In the present embodiment, the disk portion 31a corresponds to a contact portion, and the cylindrical portion 31b and the enlarged diameter portion 31c correspond to a position restricting portion (locking portion).

(Fourth Embodiment) FIG. 9 is a sectional view showing a configuration of a stator assembly 3 according to a fourth embodiment. In FIG. 9, a support 32 as a first position regulating means is constituted by a disk portion 32a and a cylindrical portion 32b which are manufactured separately from each other, as in the first and second embodiments. I have. A tapered surface 7b is formed at the upper end of the through hole 7 of the stator 4, and a conical portion 3 is formed at the upper end of the cylindrical portion 32b of the support 32 so as to correspond to the tapered surface 7b.
2c is formed. In addition, the cylindrical portion 32b is
The lower end of the cylindrical portion 32b and the disk portion 32
a is welded by laser welding to both members 32a, 32a,
32b are integrated (welds are indicated by W2). This laser welding operation is the same as in the third embodiment.

Also in the case of the present embodiment, the first
Not only the effects described in the second embodiment can be obtained, but also effects such as simplification of machining and cost reduction can be obtained as described in the second embodiment.
In the present embodiment, the disk portion 32a corresponds to a contact portion, and the cylindrical portion 32b and the conical portion 32c correspond to a position regulating portion (locking portion).

(Fifth Embodiment) FIG. 10 is a perspective view showing the structure of a support 33 according to a fifth embodiment. In FIG. 10A, a support 33 as a first position restricting means is a bottom plate 33a formed in a substantially cross shape.
And a cylindrical portion 3 vertically erected at the center of the bottom plate portion 33a.
3b. In FIG. 10B, the bottom plate portion 33a has a long plate shape with one horizontal character. In such a case, the cylindrical portion 3 of the support 33 is
3b is inserted and the upper end of the cylindrical portion 33b is welded. This case suggests that the plate portion in contact with the lower surface of the stator 4 does not necessarily have to be disk-shaped, but can be arbitrarily changed. In addition, it is also possible to form the laterally projecting portion of the bottom plate portion 33a at three places, or to form the bottom plate portion 33a in a polygonal shape.

In this embodiment, the bottom plate portion 33a
And the cylindrical portion 33b may be integral or separate, and as a specific example, the support 33 may be formed by welding two members as described in each of the above embodiments. Good. In the present embodiment, the bottom plate portion 33a corresponds to a contact portion, and the cylindrical portion 33b corresponds to a position regulating portion.

(Sixth Embodiment) FIGS. 11 and 12
FIG. 14 is a cross-sectional view illustrating a configuration of a stator assembly 3 according to a sixth embodiment. In FIG. 11, a support 61 as a first position restricting means has a disk shape,
Are assembled so as to contact the lower surface of FIG. A hole 61 a having the same diameter as the through hole 7 of the stator 4 is formed in the center of the support 61. A bush 62 is provided in the through hole 7 of the stator 4, and a ring 9 is fitted around the outer periphery of the stator 4. In this case, the stator 4
In a state where the lower surface of the substrate and the support 61 are in close contact with each other, the boundary between the through hole 7 and the hole 61a is welded by laser welding, and the two members 4 and 61 are integrated (the welded portion is indicated by W3). . During welding work by laser welding or the like, a jig 25 corresponding to the cap housing 13 of the electromagnetic valve 1 is used.
Thereby, the upper edge of the stator 4 and the upper surface of the ring 9 are pressed.

On the other hand, in FIG. 12, a support 63 as a first position regulating means is obtained by integrating the support 61 and the ring 9 shown in FIG. In such a case, a hole 63a having the same diameter as the through hole 7 of the stator 4 is formed at the center of the support 63, and the through hole 7 and the hole 63a are formed in a state where the lower surface of the stator 4 and the support 63 are in close contact with each other. Are welded by laser welding (the welded portion is indicated by W3).

In the configurations of FIGS. 11 and 12,
The same effects as in the above embodiments can be obtained. That is, since all the magnetic plates 8 constituting the stator 4 are welded to the support 61 or 63 at the welded portion W3, there is no problem such as the stator 4 being lifted and displaced.

(Seventh Embodiment) Next, a seventh embodiment will be described. In the solenoid valve 1 in each of the above embodiments, as shown in FIG. 1, since the push rod 11 is inserted into the inside of the stator assembly 3, a cylindrical position regulating member is provided in the through hole 7 of the stator 4. However, in the seventh embodiment, this configuration is changed, and the solenoid valve is configured as shown in FIG.

In FIG. 13, an electromagnetic valve 71 is configured as a normally open valve similarly to the above-mentioned electromagnetic valve 1, and a stator assembly having a spiral laminated structure is installed in a solenoid housing 72 similarly to the above-described embodiments. A seat 73 is provided. That is, the stator assembly 73 is roughly divided into a stator 74 made of a number of magnetic plates and having a through hole 75 at the center thereof, and a ring 76 attached to the outer periphery thereof. A coil 78 is wound around the annular groove 77 of the stator 74. Support 79 as first position regulating means disposed on the upper part of stator 74 in the drawing.
Are a base 79a abutting on the end face of the stator,
4 and a shaft portion 79b fitted in the through hole 75.
The lower end of the shaft body portion 79b in the figure is the stator 7 by laser welding.
4 (all plates of the stator) (welds are indicated by W4). The outer peripheral edge of the lower surface of the stator 74 is restricted in position by a ring 80 as second position regulating means. Here, in the present embodiment, the base 79a of the support 79 corresponds to the contact portion, and the shaft portion 79b and the welding portion W4
Corresponds to the position regulating unit.

On the other hand, the armature 81 is arranged so as to face the magnetic pole surface of the stator 74, and a push rod 82 extending vertically in the drawing is attached to the center of the armature 81 so as to penetrate through the valve housing 83. . A male screw portion 82a is formed at the lower end of the bush rod 82, and a nut member 84 is screwed to the male screw portion 82a. The valve body 85 is disposed so as to pass through the push rod 82, and the compression coil spring 8 is
7 and is pressed downward in the figure.

Therefore, when the coil 78 is in the demagnetized state, the valve body 85 is held at the position shown in the figure, and the passage 88 on the fuel inlet side and the passage 89 on the outlet side are kept in communication. On the other hand, when the coil 78 is in the excited state, the armature 81 is attracted to the stator 74 and the push rod 8
2 moves upward in the figure, and the valve body 85
Is lifted upward in the figure against the urging force of. Thus, the fuel inlet passage 88 and the outlet passage 89 are closed.

As described above, also in the configuration of the present embodiment, the stator 7 is provided at both the central portion and the outer peripheral portion of the stator 74.
Since the position of 4 is regulated in the axial direction of the stator, the same effects as those of the above embodiments can be obtained, and there is no problem such that the stator 74 (the plate of the magnetic material) is lifted and displaced.

(Eighth Embodiment) Next, an eighth embodiment will be described with reference to FIG. In FIG. 14, a solenoid valve 90 is configured as a normally-open valve, and a stator assembly 92 having a spiral laminated structure is disposed in a solenoid housing 91 similarly to the above-described embodiments. The stator 93 has a laminated structure including a number of magnetic plates 94, and a ring 95 is attached to the outer periphery thereof. A coil 97 is wound around the annular groove 96 of the stator 93. A support 98 as a first position regulating means disposed on the upper part of the stator 93 in the figure includes a disk part 98a and a cylindrical part 98b which abut on the end face of the stator. The lower end of the cylindrical portion 98b in the figure is welded to the stator 93 (all the magnetic plates 94) by laser welding (the welded portion is indicated by W5). Also, the stator 93
The outer peripheral edge of the lower surface of the ring 9 is a ring 9 as a second position regulating means.
9, the position is regulated. Here, in the present embodiment, the disk portion 98a of the support 98 corresponds to the contact portion, and the cylindrical portion 98b and the welded portion W5 correspond to the position regulating portion.

On the other hand, the armature 100 has a stator 93
The valve body 1 is arranged to face the magnetic pole face of
01 and one. The valve body 101 is slidably disposed with respect to the valve body 102, and is pressed downward in the drawing by the urging force of the compression coil spring 103.

Accordingly, when the coil 97 is in the demagnetized state, the valve element 101 is held at the position shown in the figure, and the fuel inlet passage 104
And the passage 105 on the outlet side are kept in communication. On the other hand, in the excited state of the coil 97, the armature 10
0 is attracted to the stator 93, so that the valve body 10
1 is lifted upward in the drawing against the urging force of the compression coil spring 103. Thereby, the passage 104 on the fuel inlet side is formed.
And the exit side passage 105 are closed.

As described above, also in the configuration of the present embodiment, the stator 9 is provided at both the center and the outer periphery of the stator 93.
Since the position of 3 is restricted in the axial direction of the stator, the same effects as those of the above embodiments can be obtained, and there is no problem such as the stator 93 (the plate made of magnetic material) being lifted and displaced.

The embodiment of the present invention can be realized in the following modes other than the above. In the first and second embodiments, the support 10 and the like are welded to the stator 4 by laser welding, but this may be changed. For example, the members may be welded by arc welding or both members may be joined by brazing. In short, any configuration that can regulate the position of the center portion and the position of the outer peripheral portion of the stator may be arbitrarily adopted and embodied.

In each of the above embodiments, the present invention is embodied as a normally-open (normally open) solenoid valve.
In addition, the range of application can be expanded. For example, the present invention may be embodied in a normally closed (normally closed) electromagnetic fuel injection valve of an automobile engine.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a solenoid valve according to an embodiment of the invention.

FIG. 2 is a perspective view showing a configuration of a stator.

FIG. 3 is a perspective view showing the shape of a magnetic plate.

FIG. 4 is a perspective view of a stator and a support before assembly as viewed from below.

FIG. 5 is a cross-sectional view for explaining the operation of assembling the stator assembly.

FIG. 6 is a cross-sectional view for explaining the operation of assembling the stator assembly.

FIG. 7 is a sectional view showing a configuration of a stator assembly according to a second embodiment.

FIG. 8 is a sectional view showing a configuration of a stator assembly according to a third embodiment.

FIG. 9 is a sectional view showing a configuration of a stator assembly according to a fourth embodiment.

FIG. 10 is a perspective view showing the shape of a support in the fifth embodiment.

FIG. 11 is a sectional view showing a configuration of a stator assembly according to a sixth embodiment.

FIG. 12 is a sectional view showing a configuration of a stator assembly according to a sixth embodiment.

FIG. 13 is a sectional view showing a configuration of a solenoid valve according to a seventh embodiment.

FIG. 14 is a sectional view showing a configuration of a solenoid valve according to an eighth embodiment.

FIG. 15 is a cross-sectional view showing a configuration of a stator assembly according to a conventional technique.

FIG. 16 is a perspective view showing a configuration of a stator according to a conventional technique.

17A and 17B are a plan view and a vertical sectional view showing a configuration of a stator assembly according to a conventional technique.

[Explanation of symbols]

1, 71: solenoid valve, 4, 74, 93: stator (stator for solenoid), 7, 75: through hole, 8, 94: magnetic plate, 10, 30, 31, 32, 33, 61, 79,
98... Support, 10a, 3 as first position regulating means
0a, 31a, 32a, 98a... Disk portions as contact portions 10b, 30b, 31b, 32b, 33b, 98b
... A cylindrical portion as a position restricting portion, 12, 81, 100... An armature, 13 (13a)... A cap housing (circumferential portion) as a second position restricting means, 31c. Enlarged diameter portion, 32c: conical portion as position restricting portion (locking portion), 33a: bottom plate portion as contact portion, 79a: base portion as contact portion, 79b: shaft portion portion as position restricting portion, 80 , 99... Rings as second position regulating means, W1, W2, W4, W5.

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor ▲ Taka ▼ Koji Su 14th Iwatani, Shimowasukamachi, Nishio City, Aichi Prefecture Inside Japan Automotive Parts Research Institute (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 7/126 H01F 7/16

Claims (6)

(57) [Claims] 1. A stator for a solenoid in which a plurality of curved magnetic plates are spirally arranged with respect to a center axis of a stator, and a position of the magnetic plates in a stator axial direction on a center side of the stator is regulated. An electromagnetic device comprising: a first position restricting means for regulating a position of the magnetic plate in a stator axial direction on an outer peripheral side of a stator in a stator axial direction. 2. The electromagnetic device according to claim 1, wherein the second position restricting means has a peripheral portion pressed against a magnetic pole surface facing the armature. 3. The first position restricting means has a contact portion abutting on a surface opposite to a magnetic pole surface facing the armature, and from the contact portion in a through hole at the center of the stator. 3. The electromagnetic device according to claim 1, further comprising a position regulating portion that regulates a position of the plate in a stator axial direction. 4. 4. The electromagnetic device according to claim 3, wherein the position restricting portion has a cylinder or a shaft welded to an end surface of the magnetic plate in a through hole of the stator. 5. The electromagnetic device according to claim 3, wherein the position restricting portion has a locking portion locked to an end surface of the plate of the magnetic body in a through hole of the stator. 6. The magnetic head according to claim 1, wherein the first position restricting means is in contact with an opposite surface of the magnetic pole surface facing the armature, and is welded to the magnetic plate in a through hole at the center of the stator. The electromagnetic device according to claim 2.