JPH10318411A - Solenoid valve and fuel injection pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve wherein deformation of a stator is prevented, prescribed performance can be always ensured. SOLUTION: In a solenoid valve 1 constituted such that it is provided with a stator 6 formed by layering a plurality of magnetic plate materials also having a through hole 9 in the axial direction (vertical direction in the Fig,) with the direction along a surface of this plate material serving as the axial direction, rod 14 slidably arranged in the through hole 9, and an armature 13 connected to the rod 14 to be attracted to the stator 6 by magnetic flux of a coil 8 wound to the stator 6, according to movement of the armature 13, a valve element 23 is operated, and in the stator 6, a C ring-shaped deformation preventing member R engaged to cross with a plurality of the plate materials is housed in a periphery of the through hole 9 in the direction around its axis. Consequently, a peripheral part of the through hole 9 of the stator 6 is prevented from being deformed in the axial direction, and in the solenoid valve 1, prescribed performance can be surely ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve and a fuel injection pump having the same.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic valve has been employed as a spill (overflow) valve of a fuel injection pump for a diesel engine, for example. That is, this type of electromagnetic valve is disposed in a fuel spill passage of a fuel injection pump, and as illustrated in FIG. 12, a stator 62 having a through hole 62a in its axial direction (vertical direction in the figure). And an armature (movable member) that is slidably disposed in the through hole 62a and is connected to the rod 63 and is attracted to the stator 62 by a magnetic flux of a coil 64 wound around the stator 62.
65. Then, the valve element 66 operates in accordance with the movement of the armature 65, and opens or closes the fuel spill passage.

More specifically, when the coil 64 is not energized,
The valve body 66 is raised by the urging force of the compression coil spring 67 and is held at the valve opening position (the position shown). When the coil 64 is energized, the armature 65
The valve body 66 is lowered along with the rod 63 by being sucked by the upper surface which is a surface in a direction orthogonal to the axial direction of the second member 2.
The valve body 66 moves to a valve closing position that closes the fuel spill passage.

In this type of solenoid valve, since high-speed operation is required, the upper and lower spaces P 1, P
2 is made equal pressure so that the responsiveness of the valve body 66 is improved. That is, the fuel feed pressure (= about 18 kg / cm ² ) by the feed pump provided in the fuel injection pump acts on both the spaces P1 and P2.

Further, a stator 62 used in this type of solenoid valve is formed by laminating a plurality of magnetic plates, and the direction along the surface of the plates is defined as an axial direction (vertical direction in the drawing). The through hole 62a is provided in the axial direction. By using the stator 62 having such a laminated structure, eddy current can be reduced, and the responsiveness of operation to energization / de-energization of the coil 64 improves.

[0006]

However, in a solenoid valve having a stator having a laminated structure as described above, the stator is likely to be deformed in the axial direction, and this deformation causes the required fuel injection amount of the fuel injection pump to be increased. There is a problem that it fluctuates.

More specifically, in the solenoid valve illustrated in FIG. 12, as described above, the fuel feed pressure by the feed pump causes the upper and lower spaces P 1, P
2, the fuel feed pressure also acts on the lower surface of the stator 62 (that is, the surface opposite to the surface on which the armature 65 is sucked). The stator 62 has a through hole 62a.
In the peripheral portion of a, each of the plate members forming the stator 62 is in a state where it is not fixed and held.

For this reason, as shown in FIG.
The periphery of the second through hole 62a is lifted up in the axial direction by the fuel feed pressure, and the air gap A / G set between the upper surface of the stator 62 and the lower surface of the armature 65 is reduced.

The air gap A /
When G decreases, in the case of the solenoid valve shown in FIG. 12, the electromagnetic attractive force of the stator 62 to the armature 65 becomes larger than an assumed value, and the valve body 66 shifts from the closed state to the open state. At that time, the response becomes slow, and the fuel injection shortage worsens. As a result, an error occurs in the fuel injection amount of the fuel injection pump, and in this case, specifically, the actual fuel injection amount becomes larger than the required amount.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an electromagnetic valve capable of preventing deformation of a stator and ensuring a predetermined performance at all times. It is an object of the present invention to provide a fuel injection pump capable of reliably obtaining an injection amount.

[0011]

Means for Solving the Problems and Effects of the Invention In a solenoid valve on which the present invention is based, a stator is formed by laminating a plurality of magnetic plates, and a direction along a surface of the plates. , The through hole is provided in the axial direction, and as described above, the periphery of the through hole in the stator may be deformed in the axial direction, and the performance of the solenoid valve may be deteriorated. .

Therefore, in the solenoid valve according to the present invention, the stator includes a deformation preventing member which intersects and engages with a plurality of the plate members around the through hole. still,
The deformation preventing member may be built in the direction around the axis of the through hole, or may be built linearly near the through hole.

According to the solenoid valve of the present invention, the plurality of plate members are connected to each other by the deformation preventing member in the peripheral portion of the through hole of the stator.
The rigidity of the stator in the axial direction is increased, and it is possible to reliably prevent the peripheral portion of the through hole of the stator from being deformed in the axial direction.

Accordingly, the air gap between the movable member that operates the valve element by being attracted to the surface in the direction perpendicular to the axial direction of the stator by the magnetic flux of the coil wound around the stator and the stator fluctuates. By preventing such a situation, the solenoid valve can reliably exhibit a predetermined performance.

Here, if the cross-sectional shape of the deformation preventing member in a direction along the surface of the plate material (that is, the axial direction of the stator) is polygonal, the deformation preventing member is The two members can be firmly engaged without slippage between the plate members, and as a result, the axial rigidity of the stator can be further increased.

In this case, the sectional shape of the deformation preventing member in the above-mentioned direction may be triangular or pentagonal. In particular, if the deformation preventing member is square, the deformation preventing member can be easily formed. be able to. Further, as the quadrangle, if a quadrangle having an acute inner angle smaller than a right angle is adopted as described in claim 4, the acute angle portion of the deformation preventing member has a wedge effect, and Engagement with the plate material can be made more reliable, and the axial rigidity of the stator can be further increased.

According to a fifth aspect of the present invention, when the stator is formed by spirally laminating a plurality of magnetic material plates having a uniform thickness and a curved shape, the stator has a uniform thickness. By closely stacking electromagnetic steel sheets (for example, silicon steel sheets) having a large saturation magnetic flux, a columnar stator having a high electromagnetic attraction can be easily obtained.

On the other hand, in the solenoid valve according to the sixth aspect, in the solenoid valve according to the first to fifth aspects, the stator is formed in a cylindrical shape, and a ring is attached to an outer peripheral portion of the stator. I have to. According to this solenoid valve, in addition to the above-described effects, the mounting load of the stator is received by the ring, and the stacking surface of the plate material (lamination of the plate material) which causes another deformation of the stator. (A surface that appears in a layered form at the time of pressing) can be reduced. Further, it is possible to prevent the plate material from being deformed in the circumferential direction of the stator.

Next, a fuel injection pump according to a seventh aspect is provided with the above-described solenoid valve according to the first to sixth aspects as an electromagnetic spill valve for opening and closing a fuel spill passage. According to this fuel injection pump, as described above, in the solenoid valve, the fluctuation of the air gap between the movable member and the stator is prevented, whereby the opening / closing timing of the valve body of the solenoid valve, that is, the fuel spill passage Since the opening / closing timing of the fuel injection valve can always be kept optimal, a desired fuel injection amount can be reliably obtained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A solenoid valve according to an embodiment of the present invention will be described below with reference to the drawings. The solenoid valve of the present embodiment is used as an electromagnetic spill valve of a fuel injection pump for a diesel engine, and functions as a normally open valve (normally open valve). That is, when the coil is normally demagnetized, the valve body is held at the position where the fuel spill passage is opened by the biasing force of the biasing member (spring), and when the coil is excited, the valve body is biased by the biasing member. It moves against the power and the fuel spill passage is closed. However, it goes without saying that the present invention is not limited to the embodiments described below, and can take various forms as long as it belongs to the technical scope of the present invention.

FIG. 1 is a sectional view showing the structure of a solenoid valve 1 according to this embodiment. In the following description, the term meaning the up-down direction is based on the direction in FIG.
As shown in FIG. 1, a solenoid valve 1 adjusts an opening degree of a fuel spill passage by moving a valve body, and a solenoid unit 2 for converting an external electric signal into mechanical energy for moving the valve body. The two parts 2 and 3 are fixed by a retainer 4.

In the solenoid section 2, a stator 6 is provided inside a cylindrical solenoid housing 5.
Are arranged. Here, as shown in FIG. 1 and FIG. 2 which is a perspective view of the stator 6, the stator 6 is provided with an annular coil insertion groove 7 that opens upward, and the coil insertion groove 7 8 are provided. Also,
The center of the stator 6 is located in the vertical direction (that is,
(In the axial direction).

As shown in FIG. 3, which is a sectional view taken along line XX of FIGS. 1 and 2, a C-shaped deformation preventing member R is provided inside the stator 6 around the axis of the through hole 9. Buried in the direction. In the present embodiment, the stator 6
As shown in FIG. 1, the cross-sectional shape of the deformation preventing member R in the axial direction has two sides parallel to the axial direction of the stator 6 and the lower side away from the through hole 9 in the drawing. Are squares (specifically, trapezoids) whose inner angles are acute angles (angles smaller than 90 degrees).

The stator 6 will be described in more detail. As shown in FIGS. 2 and 3, the stator 6 is formed in a cylindrical shape by spirally laminating a plurality of plate members 10 made of a magnetic material. I have. Specifically, first, as shown in FIG. 4, the plate material 10 forming the stator 6 is formed to have a uniform thickness and a curved shape as a whole. And
A concave portion 10 a for forming the coil insertion groove 7 is provided on a side edge of the plate material 10 which becomes the upper surface of the stator 6, and the plate material 10 becomes an inner peripheral surface of the through hole 9 of the stator 6. An engagement groove 10 for engaging with the deformation preventing member R is provided on the side edge.
b is provided. Note that the engagement groove 10b is formed in a trapezoidal shape that matches the cross-sectional shape of the deformation preventing member R. Further, in the present embodiment, a silicon steel plate having a uniform thickness is used as the plate material 10, and the plate material 10 having the shape shown in FIG. 4 is formed by pressing and punching the silicon steel plate.

Then, the stator 6 is provided with the plate 10 shown in FIG.
Is arranged in a spiral shape with respect to the center axis of the stator 6 by a jig or the like, and the outer periphery thereof is fixed in a circular shape, thereby producing a shape as shown in FIG. As shown in the drawing, the plurality of plate members 10 are spirally arranged while the deformation preventing member R is passed through the notch Ra of the engagement groove 10b of the plate member 10.

Thus, as shown in FIGS. 2 and 3, an annular coil insertion groove 7 corresponding to the concave portion 10a of the plate member 10 is formed on the upper surface side of the stator 6, and the center position of the stator 6 is adjusted. The through-hole 9 is formed in the axial direction with the direction along the surface of the plate 10 as the axial direction.
Inside the stator 6, a C-ring shaped deformation preventing member R that intersects and engages with a plurality of plate members 10 is provided around the through hole 9 in a direction around its axis.

Next, the stator 6 configured as described above is used.
As shown in FIG. 1, a cylindrical ring 11
Is assembled. When assembling the stator 6 and the ring 11, as shown in FIG. 6, the stator 6 formed by spirally laminating the plate members 10 is pressed into the ring 11.

On the other hand, as shown in FIG. 1 and FIG. 7 which is a bottom view of the stator 6, a high hardness bush 12 is press-fitted and fixed in the through hole 9 of the stator 6. As shown in FIG. 1, a rod 14 connected to an armature 13 as a movable member is disposed in the bush 12 so as to be slidable in a vertical direction.

Next, referring to FIG.
Above 3, a cover 15 that is in close contact with the inner peripheral surface of the solenoid housing 5 is provided, and a contact surface between the cover 15 and the solenoid housing 5 is sealed in a liquid-tight state by an O-ring 17. . The cover 15 has an annular protrusion 16 extending downward on the outer peripheral surface thereof.
The lower end of the projection 16 is in contact with the upper edge of the stator 6 and the upper surface of the ring 11. That is, the cover 15 is fixed by the caulking portion 5 a provided at the upper end of the solenoid housing 5, whereby the projecting portion 16 of the cover 15 presses the upper surface edge of the stator 6 and the ring 11 from above.

In the center of the lower surface of the cover 15, a stopper 18 for regulating the movable range of the armature 13 is provided. Further, a connector member 19 having a signal input terminal 20 for inputting an external electric signal is resin-molded above the cover 15, and the signal input terminal 20 of the connector member 19 is connected to a lead (not shown). It is electrically connected to the coil 8 in the stator 6 via a wire.

On the other hand, in the flow control section 3, the valve housing 22 is formed with a sliding hole 24 for slidably holding the valve body 23. The sliding hole 24 is formed in an annular shape. To the high-pressure fuel chamber 25. Further, fuel passages 26 a and 26 b communicating with the high-pressure fuel chamber 25 are formed in the valve housing 22. And
The valve body 23 is connected to the lower end of the rod 14 and is constantly urged by a compression coil spring 28 in the valve opening direction (upward in FIG. 1).

In such a solenoid valve 1, in a demagnetized state in which the coil 8 is not excited (the state of FIG. 1), a predetermined amount of air gap A / G is provided between the upper surface of the stator 6 and the lower surface of the armature 13. Is maintained, and the valve body 23 connected to the lower end of the rod 14 is held at the valve opening position that opens the space between the fuel passages 26a and 26b. At this time, the top of the armature 13 comes into contact with the stopper 18.

On the other hand, when the coil 8 is excited,
An electromagnetic attraction force is generated in the stator 6 by the magnetic flux, and the armature 13 is attracted to the stator 6 to reduce the air gap A / G. And, with this, the valve element 23
Descends and moves to a valve closing position that closes between the fuel passages 26a and 26b.

In the present solenoid valve 1, high-speed operation of the valve element 23 is required.
The high-speed response of the valve body 23 is ensured by setting 1 and Q2 as equal pressures. That is, the feed pressure (= about 18 kg / cm) by the feed pump described later is applied to both the spaces Q1 and Q2.
² ) is acting (however, the path through which the feed pressure is introduced into the space Q1 is not shown).

FIG. 8 shows a configuration of an inner-cam type distribution type fuel injection pump 31 for a diesel engine to which the above-mentioned solenoid valve 1 is applied. The pump 31 applies high pressure to each cylinder (not shown) of the engine. Fuel is distributed and supplied. As shown in FIG. 8, the fuel injection pump 3
A drive shaft 33 that rotates at a half speed in synchronization with a crankshaft (not shown) of the engine is inserted through one pump housing 32. The pump housing 32 is provided with a vane type feed pump 34 (expanded by 90 degrees in FIG. 8). The feed pump 34 sucks up fuel as the drive shaft 33 rotates, and To send out.

At the end of the drive shaft 33 (the right end in FIG. 8), the distribution rotor 3 rotating integrally with the shaft 33 is provided.
The distribution rotor 36 is rotatably accommodated in a cylinder 37 provided in the pump housing 32. An inner cam ring 38 is attached to the pump housing 32, and the head portion 36 a of the distribution rotor 36 is connected to the cam surface 3 on the inner circumference of the inner cam ring 38.
It slides and rotates along 8a.

Here, the cam surface 38a has cam ridges for the number of cylinders of the engine, the details of which are shown in FIG. As shown in FIG. 9, the head portion 36a of the distribution rotor 36
Has a cylindrical hole 39 extending in the radial direction.
A pair of plungers 40 are slidably disposed in the cylindrical hole 39. A pump chamber 41 is formed between the pair of plungers 40. Further, a shoe 42 is provided at an outer end of the plunger 40,
A roller 43 is rotatably held by the shoe 42.

Therefore, when the roller 43 slides along the cam surface 38a of the inner cam ring 38 with the rotation of the distribution rotor 36, the roller 43, the shoe 42, and the plunger 40 reciprocate integrally in the radial direction of the distribution rotor 36. Move. Then, when the plunger 40 moves to the outside in the radial direction of the distribution rotor 36, fuel is sucked into the pump chamber 41, and when it moves to the inside in the radial direction, the fuel is pumped from the pump chamber 41.

On the other hand, as shown in FIG.
, A suction port 44, a distribution port 45, and a spill port 46 are formed.
Communicates with the pump chamber 41. The suction port 44 communicates with the fuel chamber 35 via a communication passage 47a of the cylinder 37, the distribution port 45 communicates with an injection passage 48 via a communication passage 47b of the cylinder 37, and the spill port 46 A fuel spill passage (hereinafter, referred to as a spill passage) 49 is communicated with the fuel spill passage (hereinafter, referred to as a spill passage) 49 through a communication passage 47c of 37. The delivery valve 5 is provided in the injection passage 48.
0 is provided, and fuel is supplied from the delivery valve 50 to the fuel injection nozzle 51.

Here, the electromagnetic valve 1 of the present embodiment is disposed in the middle of the spill passage 49 as an electromagnetic spill valve. More specifically, the solenoid valve 1 has two fuel passages 26a and 26b formed in the valve housing 22 thereof (FIG. 1).
Of the spill passage 49a.
And the other fuel passage 26 b is arranged to communicate with the fuel chamber 35. The solenoid valve 1 is attached to the pump housing 32 by a screw 4a formed on the outer peripheral surface of the retainer 4.

The solenoid valve 1 opens or closes the spill passage 49 depending on whether or not the coil 8 is energized. That is, when the coil 8 is not energized, the urging force of the compression coil spring 28 holds the valve body 23 at the valve opening position (the position shown in FIG. 8), and the solenoid valve 1 maintains the valve open state. Therefore, the fuel pumped from the pump chamber 41 at this time is spilled (overflowed) into the fuel chamber 35 via the spill passage 49 and the high-pressure fuel chamber 25 in the solenoid valve 1. When the coil 8 is energized, the valve body 23 moves to the valve closing position (downward in FIG. 8) against the urging force of the compression coil spring 28, and the solenoid valve 1 is closed. Thus, the fuel spill from the pump chamber 41 to the fuel chamber 35 is stopped.

By the opening and closing operation of the electromagnetic valve 1, high-pressure fuel is injected from the fuel injection nozzle 51 to the cylinder of the engine via the injection passage 48 and the delivery valve 50, and high-pressure fuel is spilled via the spill passage 49. The fuel injection is terminated. Such an opening and closing operation of the solenoid valve 1 is repeatedly executed for each fuel injection of each cylinder (for example, for four cylinders, every 180 ° CA).

In the present fuel injection pump 31, the fuel injection timing is adjusted by a timer mechanism (not shown), but is omitted in this description. The opening and closing operation of the solenoid valve 1 is in accordance with an electric signal output from an electronic control unit (not shown), but this is also omitted in this description.

According to the solenoid valve 1 and the fuel injection pump 31 of this embodiment described in detail above, the following specific actions and effects are obtained. First, according to the present embodiment, when the fuel injection pump 31 is operated, the deformation of the stator 6 constituting the solenoid valve 1 in the axial direction is reliably prevented, thereby eliminating the error in the fuel injection amount. Can be.

That is, as described above, the solenoid valve 1 opens and closes at a high speed in accordance with the rotation of the engine, and the valve body 23 always supplies the feed pressure (about 18 k
g / cm ² ) (spaces Q1, Q in FIG. 1).
2). This feed pressure acts on the lower surface of the stator 6 via the space Q1 and the communication passage 29 in FIG. 1. Therefore, if the stator 6 of the solenoid valve 1 does not have the deformation preventing member R, 6 is lifted up in the axial direction by the feed pressure, and the stator 6
1 and the air gap A / G between the lower surface of the armature 13 fluctuates (FIG. 1).
2).

On the other hand, in the solenoid valve 1 of the present embodiment, as described above, the stator 6 penetrates the deformation preventing member R which intersects and engages with a plurality of plate members 10 constituting the stator 6. Since it is built around the hole 9 in the direction around its axis, in the peripheral portion of the through hole 9 of the stator 6,
The plurality of plate members 10 are connected to each other by the deformation preventing member R. Therefore, the rigidity of the stator 6 in the axial direction is increased, and it is possible to reliably prevent the peripheral portion of the through hole 9 of the stator 6 from being deformed in the axial direction. Therefore, the air gap A / G between the armature 13 and the stator 6 is prevented from fluctuating, and the solenoid valve 1 can reliably exhibit a predetermined performance.

According to the fuel injection pump 31 of this embodiment in which such an electromagnetic valve 1 is employed as an electromagnetic spill valve, the opening / closing timing of the spill passage 49 is always kept at an optimum, and a desired fuel injection amount is ensured. Can be obtained. Further, in the solenoid valve 1 of the present embodiment, since the sectional shape of the deformation preventing member R in the axial direction of the stator 6 (the direction along the surface of the plate material 10) is a trapezoid in which one of the inner angles is an acute angle, The acute angle portion has a wedge effect, the engagement between the deformation preventing member R and the plate 10 can be ensured, and the axial rigidity of the stator 6 can be further increased.

On the other hand, in the solenoid valve 1 of the present embodiment, the stator 6 is formed by forming a magnetic plate 10 having a uniform thickness and a curved shape by press working, and laminating the plate 10 in a spiral shape. Make up. Therefore, the cylindrical stator 6 having a high electromagnetic attraction force can be easily manufactured without using a cutting method or a sintering method. Further, eddy current flowing through the stator 6 can be reduced, and high-speed response of the solenoid valve 1 can be obtained.

On the other hand, in the solenoid valve 1 of the present embodiment, a cylindrical ring 11 is provided on the outer periphery of the stator 6, and the ring 11 receives the pressing force of the cover 15, which is an assembly load of the stator 6. The pressing force of the cover 15 acting on the upper surface of the stator 6 can be reduced,
Vertical deformation of the stator 6 due to the pressing force can be prevented. Further, by assembling the ring 11, the shape of the plate 10 in the circumferential direction of the stator 6 can be prevented from being deformed.

In the solenoid valve 1 of the above-described embodiment, as shown in FIG. 4, a deformation preventing member is formed on the plate 10 constituting the stator 6 along the side edge serving as the inner peripheral surface of the through hole 9. R is provided with an engagement groove 10b, but a hole having the same shape as the engagement groove 10b is provided on the inner side of the side edge of the plate member 10 so that the deformation preventing member R can pass through the hole. Is also good.

Further, the deformation preventing member R is not limited to the above-mentioned C-ring member, and for example, a plurality of arc-shaped members obtained by dividing a ring-shaped member at predetermined angles may be used. good. Specifically, as the deformation preventing member R, a member having a semicircular shape (a 180-degree arc shape) in plan view is used.
It is conceivable to use one or four members having a 90-degree arc shape in plan view.

On the other hand, the cross-sectional shape of the deformation preventing member R in the axial direction of the stator 6 is not limited to the trapezoidal shape shown in FIG. 1, but the polygonal shape is more deformable than the rounded shape. The slip between the prevention member R and the plate 10 is eliminated,
The rigidity of the stator 6 in the axial direction can be increased.

On the other hand, as a stator of the solenoid valve 1,
In addition to the above-described stator 6, for example, a stator as shown in FIGS. 10 and 11 may be used. (1) First, the stator 53 shown in FIG. 10 is formed by laminating a plurality of plate members 54 made of a magnetic material radially with respect to a central axis, so that a direction along the plane of the plate members 54 is set at the center in the axial direction. It is formed in a columnar shape having a through hole 55 as shown. In FIG. 10, a coil insertion groove for disposing a coil is not shown.

Although not shown in the figure, also in this stator 53, the side edge of each plate member 54, which is the inner peripheral surface of the through hole 55, is provided on the plate member 10 of the above-described embodiment. An engagement groove similar to the groove 10b is provided,
A plurality of plate members 54 are radially stacked with the deformation preventing member R passed through the engagement groove.

Therefore, even with the solenoid valve using the stator 53, the peripheral portion of the through hole 55 of the stator 53 can be prevented from being deformed in the axial direction, and the predetermined performance can be reliably exhibited. Become like (2) Next, the stator 56 shown in FIG. 11 is formed by laminating a plurality of E-shaped plate members 57 made of a magnetic material, and after further laminating the plate members 57, as shown in FIG.
At the center thereof, a through hole 58 is formed with the direction along the surface of the plate member 57 as the axial direction. In the stator 56, a coil is wound around an E-shaped portion after the plate members 57 are stacked.

In this case, in the case of the stator 56, a rectangular column-shaped deformation preventing member R 'is passed through each of the plate members 57 above and below the through hole 58 in FIG. A square engaging hole 57a is formed in advance. After stacking the plurality of plate members 57, the engagement holes 57
By press-fitting the deformation preventing member R ′ into a, the stator 56 is configured such that the deformation preventing member R ′ that intersects and engages with a plurality of plate members 57 is linearly built around the through hole 58. ing.

Also, with the solenoid valve using the stator 56, the peripheral portion of the through hole 58 of the stator 56 can be prevented from being deformed in the axial direction, and the predetermined performance can be reliably exhibited. Become like

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a solenoid valve according to an embodiment.

FIG. 2 is a perspective view of a stator.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a perspective view of a plate material forming a stator.

FIG. 5 is an explanatory diagram illustrating an assembled state of a stator.

FIG. 6 is a perspective view showing a stator and a ring.

FIG. 7 is a bottom view of the stator.

FIG. 8 is a sectional view showing a configuration of an inner cam type distribution type fuel injection pump.

FIG. 9 is a perspective view showing a configuration of an inner cam pressure feeding unit.

FIG. 10 is a perspective view showing a stator according to another embodiment.

FIG. 11 is a perspective view showing a stator according to another embodiment different from FIG. 10;

FIG. 12 is an explanatory diagram illustrating a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic valve 6, 53, 56 ... Stator 7 ... Coil insertion groove 8 ... Coil 9, 55, 58 ... Through-hole 10, 5
4, 57: plate material 10a: concave portion 10b: engaging groove 57a: engaging hole
R: deformation prevention member Ra: cut portion 11: ring 13: armature 14: rod 15: cover 23: valve body 26a, 26b: fuel passage 28: compression coil spring 31: inner cam type distribution type fuel injection pump 34: vane type feed Pump 36 Distribution rotor 48 Injection passage 49 Fuel spill passage

Claims (7)

[Claims] 1. A stator comprising a plurality of magnetic plate members laminated and having a through hole in the axial direction with a direction along the surface of the plate member as an axial direction, and a coil wound on the stator. A movable member that is attracted to a surface of the stator in a direction perpendicular to the axial direction by the magnetic flux, wherein the solenoid valve is configured to operate a valve body with the movement of the movable member. A solenoid valve, wherein a deformation preventing member that intersects and engages with a plurality of the plate members is built in around the through hole. 2. The solenoid valve according to claim 1, wherein the deformation preventing member has a polygonal cross section in a direction along a surface of the plate material. Solenoid valve according to the above. 3. The solenoid valve according to claim 2, wherein the polygon is a quadrangle. 4. The solenoid valve according to claim 3, wherein the square is a square having an acute inner angle smaller than a right angle. 5. The solenoid valve according to claim 1, wherein the plate member has a uniform thickness and a curved shape, and the stator spirals a plurality of the plate members. An electromagnetic valve characterized by being laminated in a shape. 6. The solenoid valve according to claim 1, wherein the stator has a columnar shape, and a ring is attached to an outer peripheral portion thereof. 7. A fuel injection pump, comprising the electromagnetic valve according to claim 1 as an electromagnetic spill valve for opening and closing a fuel spill passage.