JP7070069B2 - Solenoid valve and fuel injection device using it - Google Patents

Description

The present invention relates to a solenoid valve and a fuel injection device using the solenoid valve.

Conventionally, as described in Patent Document 1, a valve body in which a plurality of movers are engaged and driven by a current flowing through a solenoid and a fuel injection device including the valve body are known.

Japanese Unexamined Patent Publication No. 2014-141924

When a plurality of movers are engaged as in the configuration of Patent Document 1, the variation in the size of the surfaces where the movers come into contact with each other increases, and the variation in the magnetic flux passing through the movers increases. When the variation of the magnetic flux becomes large, the variation of the movement amount of the mover becomes large, and the variation of the movement amount of the valve body becomes large.

Therefore, in order to reduce the variation in the amount of movement of the valve body, it is necessary to reduce the variation in the size of the surfaces where the movers come into contact with each other. However, in order to reduce the variation in the size of the surfaces where the movers come into contact with each other, the tolerances of the movers and the tolerances between the plurality of movers should be strict when manufacturing the valve body or assembling the valve body to the device. Need to be managed. This makes it difficult to manufacture the valve body or assemble the valve body into the device.

The present invention has been created in view of these points, and an object of the present invention is to provide a solenoid valve having a simple structure and easy to assemble, and a fuel injection device using the solenoid valve. ..

The solenoid valve of the present invention includes a housing (10), a plate portion (30), a first movable portion (41), a first urging member (51), a second movable portion (42), and a second urging member (52). ), Solenoid (70), first magnetic part (71) and second magnetic part (72).

The housing has a bottomed cylinder shape and has a first pressure chamber (21) and a second pressure chamber (22).
Fluid can flow in and out of the first pressure chamber .
The second pressure chamber can communicate with the first pressure chamber .

The plate portion is between the first pressure chamber and the second pressure chamber, is formed in the housing, and has a first fluid flow path (31) and a second fluid flow path (32).
The first fluid flow path communicates with the first pressure chamber and the second pressure chamber.
The second fluid flow path includes an axis (Of2) different from the axis (Of1) of the first fluid flow path, and communicates with the first pressure chamber and the second pressure chamber.

The first movable portion is housed in the second pressure chamber, and can open and close the first fluid flow path to control the pressure in the first pressure chamber and the pressure in the second pressure chamber.
The first urging member urges the first movable portion in a direction in which the first movable portion closes the first fluid flow path.
The second movable portion is housed in the second pressure chamber and is formed on the outside of the first movable portion, and opens and closes the second fluid flow path to control the pressure in the first pressure chamber and the pressure in the second pressure chamber. It is possible.
The second urging member urges the second movable portion in a direction in which the second movable portion closes the second fluid flow path.

The solenoid is provided in the housing on the second pressure chamber side, and can generate a magnetic field in the housing, the first movable portion, and the second movable portion.
The first magnetic portion is a housing on the second pressure chamber side, is formed on the radial inside of the housing with respect to the solenoid, and faces the first movable portion and the second movable portion.
The second magnetic portion is a housing on the second pressure chamber side, is formed on the radial outer side of the housing with respect to the solenoid, and faces the second movable portion.

In the portion facing the second movable portion, the outer surface (714) of the first magnetic portion and the inner surface surface (725) of the second magnetic portion are separated in the radial direction of the housing, and the first magnetic portion in the radial direction of the housing. The shortest distance from the outer surface of the second magnetic portion to the inner surface of the second magnetic portion is defined as the first shortest distance (G1).
The shortest distance from the facing surface (723) of the second magnetic portion to the facing surface (423) of the second movable portion in the axial direction of the housing is defined as the second shortest distance (G2).
In the portion facing the first magnetic portion, the outer surface (414) of the first movable portion and the inner surface surface (424) of the second movable portion are separated in the radial direction of the housing, and the first movable portion in the radial direction of the housing is separated. The shortest distance from the outer surface of the second movable portion to the inner surface of the second movable portion is defined as the third shortest distance (G3).
The shortest distance from the facing surface (713) of the first magnetic portion to the facing surface (413) of the first movable portion in the axial direction of the housing is defined as the fourth shortest distance (G4).
The first shortest distance is larger than the sum of the second shortest distance, the third shortest distance, and the four shortest distances (G2 + G3 + G4).

The solenoid generates a first magnetic circuit, which is a magnetic circuit that passes through the first movable portion, the first magnetic portion, the second magnetic portion, and the second movable portion. Further, the solenoid generates a second magnetic circuit, which is a magnetic circuit that passes through the second movable portion, the first magnetic portion, and the second magnetic portion. With the above configuration, the first magnetic circuit and the second magnetic circuit are generated without short-circuiting the first magnetic circuit and the second magnetic circuit. Since the first magnetic circuit and the second magnetic circuit are not short-circuited, the first movable portion and the second movable portion can easily move independently. Therefore, it is not necessary to consider the variation in the size of the contact area between the movable parts, and it is possible to relax the management of the tolerance of the movable part and the tolerance between the plurality of movable parts at the time of manufacturing or assembling. Therefore, the solenoid valve has a simple structure. In addition, the first movable portion and the second movable portion can be easily manufactured, and the solenoid valve can be easily assembled.

Further, in the fuel injection device of the present invention, the housing (10), the plate portion (30), the first movable portion (41), the first urging member (51), and the second movable portion (42) are similarly described above. , A second urging member (52), a solenoid (70), a first magnetic portion (71) and a second magnetic portion (72). Further, the fuel injection device includes a needle (60).

The housing further has a jet hole (17) at the tip to which fuel as a fluid is injected.
The needle is reciprocating within the housing and opens and closes the injection hole when the first or second movable portion controls the pressure in the first pressure chamber and the pressure in the second pressure chamber. Similarly, the first shortest distance is larger than the sum of the second shortest distance, the third shortest distance, and the four shortest distances (G2 + G3 + G4). With this configuration, the same effect as described above is obtained. Since the accuracy of the moving amount of the solenoid valve is improved, the controllability of the fuel pressure in the combustion injection device is improved, and the accuracy of the fuel injection amount is improved.

A cross-sectional view of a fuel injection device in which a solenoid valve according to an embodiment is used. FIG. 1 is an enlarged view of part II. FIG. 2 is an enlarged view of Part III. A partial cross-sectional view of a fuel injection device when a magnetic field is generated in a solenoid valve according to an embodiment. FIG. 5 is a relationship diagram showing a first attractive force, a second attractive force, a first solenoid valve force, a second solenoid valve force, opening / closing of a first movable portion, and opening / closing of a second movable portion with respect to a solenoid current of the solenoid valve according to one embodiment. FIG. 3 is a partial cross-sectional view of a fuel injection device when the first movable portion of the solenoid valve according to the embodiment is moved. FIG. 3 is a partial cross-sectional view of a fuel injection device when the first movable portion and the second movable portion of the solenoid valve according to the embodiment are moved. A relationship diagram showing a first attractive force, a second attractive force, a first solenoid valve force, a second solenoid valve force, an opening / closing of a first movable portion, and an opening / closing of a second movable portion with respect to a solenoid current of the solenoid valve according to another embodiment. .. FIG. 3 is a partial cross-sectional view of a fuel injection device when the second movable portion of the solenoid valve according to another embodiment is moved. Sectional drawing of the fuel injection apparatus which uses the solenoid valve by another embodiment. FIG. 10 is an enlarged view of the XI portion. The enlarged view of the XII part of FIG.

Hereinafter, embodiments of the solenoid valve will be described with reference to the drawings. In the description of the plurality of embodiments, substantially the same configuration will be described with the same reference numerals. The present embodiment includes a plurality of embodiments. The solenoid valve of this embodiment is used in a fuel injection device included in an internal combustion engine. First, the fuel injection device 1 will be described.

As shown in FIG. 1, the fuel injection device 1 includes a housing 10, an orifice plate 30 as a plate portion, a pressure control plate 35, a solenoid valve 81, a needle 60, a solenoid 70, and a current control unit 75. The fuel injection device 1 is attached to each cylinder of the internal combustion engine, and injects fuel as a fluid into each cylinder. The fuel is stored in the high pressure state of the common rail 90.

The housing 10 is formed in the shape of a bottomed cylinder. In the figure, the housing 10 is described in four parts for convenience, but does not necessarily reflect the actual product configuration. For the sake of explanation, it is assumed that the housing 10 includes the nozzle housing 23, the control chamber plate 24, the orifice plate 30, and the body housing 25 in this order from the tip side.

The housing 10 has a nozzle chamber 16, a spray hole 17, and a valve seat 18 in the nozzle housing 23 on the distal end side. Further, the housing 10 has housing flow paths 12, 14 and a first pressure chamber 21 in the control chamber plate 24. Further, the housing 10 has housing flow paths 11 and 15 and a second pressure chamber 22 in the body housing 25.

The nozzle chamber 16 is partitioned by an inner wall 101 of the housing 10 and an outer wall 601 of the needle 60.
The injection holes 17 are formed at predetermined intervals in the circumferential direction of the housing 10, and a plurality of injection holes 17 are formed at the tip end 102 of the housing 10.
The valve seat 18 is formed around the injection hole 17 and on the bottom surface inside the tip portion 102 of the housing 10. The valve seat 18 is formed in a conical shape.

The housing flow path 11 is connected to the common rail 90 and communicates with the housing flow path 12 and the housing flow path 13. The housing flow path 12 communicates with the housing flow path 11 and the nozzle chamber 16. The housing flow path 13 communicates with the housing flow path 11. Further, the housing flow path 13 can communicate with the first pressure chamber 21 and communicates with the first pressure chamber 21 by the pressure control plate 35. Further, the housing flow path 13 is formed with an in-orifice 19 whose diameter is narrowed on the pressure control plate 35 side. The housing flow path 14 communicates with the first pressure chamber 21 and the nozzle chamber 16. The housing flow path 15 is a low pressure chamber flow path and communicates with the second pressure chamber 22 to the outside.

The housing flow paths 11-15 include a circular cross section, and each has a uniform diameter. The flow path area of the housing flow path 11-15 is set to be relatively large, and the amount of fuel inflow and outflow in the housing 10 is set so as not to be affected by the flow path area of the housing flow path 11-15. Has been done. The flow path area is the cross-sectional area in the direction intersecting the fuel flow.

The fuel from the common rail 90 is supplied to the nozzle chamber 16 via the housing flow paths 11 and 12. Further, when the housing flow path 13 and the first pressure chamber 21 communicate with each other by the pressure control plate 35, the fuel from the common rail 90 is supplied to the first pressure chamber 21 via the housing flow paths 11 and 13. Ru.

The first pressure chamber 21 is formed on the opposite side of the orifice plate 30 from the second pressure chamber 22. The first pressure chamber 21 is formed on the tip end side of the housing 10 with respect to the second pressure chamber 22. Further, the first pressure chamber 21 is formed between the orifice plate 30 and the needle 60, and is partitioned by the inner wall 104 of the housing 10. Further, the first pressure chamber 21 communicates with the nozzle chamber 16 via the housing flow path 14. Further, the fuel of the common rail 90 and the fuel of the nozzle chamber 16 can flow in and out of the first pressure chamber 21. The pressure in the first pressure chamber 21 is defined as the first pressure P1.

The second pressure chamber 22 is formed on the opposite side of the orifice plate 30 from the first pressure chamber 21. The second pressure chamber 22 is formed on the rear end side of the housing 10 with respect to the first pressure chamber 21. Further, the second pressure chamber 22 is partitioned by the inner wall 105 of the housing 10 on the rear end side of the orifice plate 30. The pressure in the second pressure chamber 22 is defined as the second pressure P2. Further, the second pressure chamber 22 can communicate with the first pressure chamber 21. When the first pressure chamber 21 and the second pressure chamber 22 communicate with each other, the fuel in the first pressure chamber 21 flows out to the outside via the second pressure chamber 22 and the housing flow path 15.

The orifice plate 30 is between the first pressure chamber 21 and the second pressure chamber 22 and is formed in the housing 10, and serves as a sub-out orifice 31 as a first fluid flow path and a second fluid flow path. It has a second out orifice 32. The sub-out orifice 31 and the second out orifice 32 include a circular cross section.

The sub-out orifice 31 is an intermediate chamber and communicates with the first out orifice 36 of the pressure control plate 35. The sub-out orifice 31 communicates with the first pressure chamber 21 via the first out orifice 36. Further, the sub-out orifice 31 communicates with the second pressure chamber 22. At the location where the sub-out orifice 31 and the first out orifice 36 are connected, the flow path area of the sub-out orifice 31 and the flow path area of the first out orifice 36 are relatively large. The minimum flow path area of the sub-out orifice 31 is defined as the first plate flow path area Ap1. Although the sub-out orifice 31 on the second pressure chamber 22 side is uniformly formed, the diameter of the sub-out orifice 31 may be reduced.

The second out orifice 32 communicates with the first pressure chamber 21 and the second pressure chamber 22. The diameter of the second out orifice 32 is narrowed in the middle portion. At the location where the second out orifice 32 and the second pressure chamber 22 are connected, the flow path area of the second out orifice 32 is relatively large. The minimum flow path area of the second out orifice 32 is defined as the second plate flow path area Ap2. In addition, in FIG., since the second out orifice 32 is formed in the direction orthogonal to the cross section of FIG. 1, it is described by a broken line.

The second out orifice 32 is formed at a position different from that of the sub out orifice 31. The sub-out orifice 31 and the second out-orifice 32 are formed so that the position or inclination of the axis Of2 of the second out-orifice 32 is different from the position or inclination of the axis Of1 of the sub-out orifice 31. The axis Of1 of the sub-out orifice 31 is coaxial with the first movable portion 41 and the second movable portion 42. The sub-out orifice 31 and the second out orifice 32 are formed in parallel in the orifice plate 30.

The pressure control plate 35 is housed in the first pressure chamber 21. Further, the pressure control plate 35 is formed in a plate shape and can control the first pressure P1. Further, the pressure control plate 35 has a first out orifice 36 and a control plate spring 37.

The first out orifice 36 is formed in the center of the pressure control plate 35 and communicates with the first pressure chamber 21 and the sub out orifice 31. The first out orifice 36 includes a circular cross section and is narrowed in diameter near the center of the oil flow path. The minimum flow path area of the first out orifice 36 is defined as the control flow path area Ac. The control flow path area Ac is set so as to be smaller than the first plate flow path area Ap1, that is, Ac <Ap1.

The control plate spring 37 is provided between the pressure control plate 35 on the distal end side and the inside of the housing 10. Further, the control plate spring 37 urges the pressure control plate 35 in the direction in which the pressure control plate 35 closes the housing flow path 13. In the initial state, the urging force of the control plate spring 37 and the first pressure P1 are set to be larger than the pressure of the fuel from the common rail 90. Therefore, in the initial state, the pressure control plate 35 closes the housing flow path 13.

The solenoid valve 81 is housed in the second pressure chamber 22 and is formed in the body housing 25, and can open and close the sub-out orifice 31 or the second out orifice 32. When the solenoid 70 is energized, the solenoid valve 81 moves to open and close the sub-out orifice 31 or the second out orifice 32. When the sub-out orifice 31 or the second out orifice 32 is opened and closed, the first pressure P1 and the second pressure P2 are controlled. The opening direction is the direction in which the solenoid valve 81 opens the sub-out orifice 31 or the second out orifice 32. The closing direction is the direction in which the solenoid valve 81 closes the sub-out orifice 31 or the second out orifice 32.

The needle 60 is housed in the nozzle chamber 16 and can be reciprocated within the housing 10. A guide may be provided in the housing 10. The needle 60 may be slidable along the guide. The axis of the needle 60 is different from the axis of the solenoid valve 81. The shaft of the needle 60 may be coaxial with the shaft of the solenoid valve 81.

Further, the needle 60 has a pressure receiving surface 61 on the front end side, and a back pressure surface 62 and a needle spring 63 on the rear end side.
The pressure receiving surface 61 is formed in a tapered shape, and the fuel flowing into the nozzle chamber 16 receives the pressure acting on the needle 60 in the direction of opening the injection hole 17. Let Fp_b be the total pressure received by the pressure receiving surface 61.
The back pressure surface 62 receives the pressure that the needle 60 acts on in the direction of closing the injection hole 17 due to the fuel flowing into the nozzle chamber 16. Let Fp_n be the total pressure received by the back pressure surface 62.

The needle spring 63 is housed in the nozzle chamber 16. The needle spring 63 urges the needle 60 in a direction in which the needle 60 closes the injection hole 17. The force that the needle spring 63 urges the needle 60 is defined as the needle urging force Fs_n. In the initial state, the total pressures Fp_b, Fp_n and the needle urging force Fs_n are set so as to have the following relational expression (1).
Fp_n + Fs_n> Fp_b ... (1)

The needle 60 moves in the axial direction of the housing 10 when the solenoid valve 81 controls the first pressure P1 and the second pressure P2. At this time, the needle 60 opens and closes the injection hole 17. The direction in which the needle 60 opens the injection hole 17 coincides with the opening direction of the solenoid valve 81. The direction in which the needle 60 closes the injection hole 17 coincides with the closing direction of the solenoid valve 81.

When the needle 60 moves in the opening direction, the tip portion 64 of the needle 60 separates from the valve seat 18. When the tip 64 of the needle 60 separates from the valve seat 18, the needle 60 opens the injection hole 17. When the injection hole 17 is opened, the fuel in the nozzle chamber 16 is injected from the injection hole 17. Further, when the needle 60 moves in the closing direction, the tip portion 64 of the needle 60 comes into contact with the valve seat 18. When the tip 64 of the needle 60 comes into contact with the valve seat 18, the needle 60 closes the injection hole 17. When the injection hole 17 is closed, the injection of fuel from the injection hole 17 is stopped.

One solenoid 70 is provided at the rear end 106 of the housing 10. Further, the solenoid 70 has a winding wound around the outer circumference of the bobbin. The solenoid 70 can generate a magnetic field in the housing 10 and the solenoid valve 81, and can generate a magnetic field in the first movable portion 41, the second movable portion 42, the first magnetic portion 71, and the second magnetic portion 72. The current flowing through the solenoid 70 is defined as the solenoid current Ic.

The current control unit 75 is mainly composed of a microcomputer. The current control unit 75 includes a CPU, a readable non-temporary tangible recording medium, a ROM, I / O, a bus line connecting these configurations, and the like. Each process of the current control unit 75 may be a software process by executing a program stored in advance in a substantive memory device such as a ROM on the CPU, or a hardware process by a dedicated electronic circuit. May be good. In the figure, the current control unit 75 is referred to as an ECU.

Further, the current control unit 75 is electrically connected to the solenoid 70, and the solenoid 70 can be energized. Further, the current control unit 75 can control the solenoid current Ic. The initial state is when no current is flowing through the solenoid 70, the solenoid valve 81 closes the sub-out orifice 31 and the second out orifice 32, and the needle 60 closes the injection hole 17.

Conventionally, as described in Patent Document 1, a valve body in which a plurality of movers are engaged and driven by a current flowing through a solenoid and a fuel injection device including the valve body are known. When a plurality of movers are engaged as in the configuration of Patent Document 1, the variation in the size of the surfaces where the movers come into contact with each other increases, and the variation in the magnetic flux passing through the movers increases. When the variation of the magnetic flux becomes large, the variation of the movement amount of the mover becomes large, and the variation of the movement amount of the valve body becomes large.

Therefore, in order to reduce the variation in the amount of movement of the valve body, it is necessary to reduce the variation in the size of the surfaces where the movers come into contact with each other. However, in order to reduce the variation in the size of the surfaces where the movers come into contact with each other, the tolerances of the movers and the tolerances between the plurality of movers should be strict when manufacturing the valve body or assembling the valve body to the device. Need to be managed. This makes it difficult to manufacture the valve body or assemble the valve body into the device. Therefore, in the present embodiment, a solenoid valve that has a simple configuration and is easy to assemble is provided.

(One embodiment)
As shown in FIG. 2, the solenoid valve 81 includes a first movable portion 41, a second movable portion 42, a first spring 51 as a first urging member, a second spring 52 as a second urging member, and a first. A magnetic portion 71 and a second magnetic portion 72 are provided.

The first movable portion 41 is made of a magnetic material. The first movable portion 41 is housed in the second pressure chamber 22 and is formed inside the second movable portion 42. Further, the first movable portion 41 can open and close the sub-out orifice 31. The first movable portion 41 can control the first pressure P1 and the second pressure P2 by opening and closing the sub-out orifice 31. The force acting on the first movable portion 41 in the direction in which the first movable portion 41 opens the sub-out orifice 31 by the second pressure P2 is set as the first fluid assisting force Ff1.

Further, the first movable portion 41 has a first movable base portion 411 and a movable flange portion 412, and has a T-shaped cross section. In one embodiment, the first movable base portion 411 and the movable flange portion 412 are formed as separate bodies. The first movable base portion 411 and the movable flange portion 412 may be integrated.

The first movable base portion 411 is a rod-shaped portion extending in the axial direction of the first movable portion 41.
The movable flange portion 412 has an annular cross section. The movable flange portion 412 is formed on the second pressure chamber 22 side, and is formed on the side opposite to the orifice plate 30, that is, on the first movable portion 41 on the rear end side. The movable flange portion 412 is provided in a direction from the first movable base portion 411 on the rear end side toward the radial outer side of the housing 10, a direction toward the radial outer side from the first movable base portion 411 on the rear end side to the first movable portion 41, or. , Extends in the direction from the first movable base portion 411 on the rear end side toward the second movable portion 42.

The second movable portion 42 has a cylindrical shape and is made of a magnetic material. The second movable portion 42 is housed in the second pressure chamber 22 and is formed on the outside of the first movable portion 41. Further, the second movable portion 42 can open and close the second out orifice 32. The second movable portion 42 can control the first pressure P1 and the second pressure P2 by opening and closing the second out orifice 32. The force acting on the second movable portion 42 in the direction in which the second movable portion 42 opens the second out orifice 32 by the second pressure P2 is defined as the second fluid assisting force Ff2.

Further, the second movable portion 42 has a second movable base portion 421 and a movable recess 422.
The second movable base portion 421 is a cylindrical portion of the second movable portion 42. The second movable base portion 421 is formed so that the outer diameter of the second movable base portion 421 on the rear end side is larger than the outer diameter of the second movable base portion 421 on the distal end side.

The movable recess 422 is formed so that the first movable base portion 411, the movable flange portion 412, and the second movable base portion 421 are separated from each other. The movable recess 422 is recessed in the radial direction of the housing 10, the radial direction of the second movable portion 42, or the direction from the first movable base portion 411 toward the second movable portion 42 from the second movable base portion 421 on the rear end side. I'm out. Further, the movable recess 422 is recessed from the second movable base portion 421 on the rear end side in the axial direction of the housing 10 or in the axial direction of the second movable portion 42. The movable recess 422 faces the movable flange portion 412 in the radial and axial directions of the housing 10.

The direction in which the first movable portion 41 or the second movable portion 42 moves toward the opening direction is the positive direction. The direction in which the first movable portion 41 or the second movable portion 42 moves toward the closing direction is defined as a negative direction. The amount of movement of the first movable portion 41 in the opening direction from the initial state is defined as the first solenoid valve movement amount Le1. The amount of movement of the second movable portion 42 in the opening direction from the initial state is defined as the second solenoid valve movement amount Le2. The first solenoid valve movement amount Le1 and the second solenoid valve movement amount Le2 in the initial state are both set to zero. In the present specification, "zero" shall include a common sense error range.

When the first movable portion 41 opens and closes the sub-out orifice 31, a gap is formed between the first movable portion 41 and the orifice plate 30. Further, when the second movable portion 42 opens and closes the second out orifice 32, a gap is formed between the second movable portion 42 and the orifice plate 30. The flow path area of these gaps is set to be relatively large. Therefore, the amount of fuel inflow and outflow in the housing 10 is set so as not to be affected by the flow path area of the gap formed between the first movable portion 41 or the second movable portion 42 and the orifice plate 30. Has been done.

The first spring 51 is provided on the rear end side of the first movable portion 41, and is housed in the second pressure chamber 22. The first spring 51 urges the first movable portion 41 in a direction in which the first movable portion 41 closes the sub-out orifice 31. The force that the first spring 51 urges the first movable portion 41 is defined as the first urging force Fs1.

The second spring 52 is provided between the first movable portion 41 and the second movable portion 42, and is housed in the second movable portion 42. The second spring 52 urges the second movable portion 42 in the direction in which the second movable portion 42 closes the second out orifice 32. Further, the second spring 52 urges the first movable portion 41 toward the opening direction of the first movable portion 41 by the repulsive force.

The first urging force Fs1 and the second urging force Fs2 are expressed, for example, as the following relational expressions (2-1) and (2-2). F1 is the urging force of the first spring 51 in the initial state. F2 is the urging force of the second spring 52 in the initial state. k1 is the spring constant of the first spring 51. k2 is the spring constant of the second spring 52. The first spring 51 and the second spring 52 are formed so that the first urging force Fs1 is different from the second urging force Fs2.
Fs1 = F1 + k1 x Le1-k2 x (Le1-Le2) ... (2-1)
Fs2 = F2 + k2 × (Le2-Le1) ・ ・ ・ (2-2)

The first magnetic portion 71 has a bottomed cylinder shape and is made of a magnetic material. The first magnetic portion 71 is formed in the housing 10 on the second pressure chamber 22 side, that is, in the rear end portion 106 of the housing 10. Further, the first magnetic portion 71 is formed so as to cover the first spring 51 with the first movable portion 41. Further, the first magnetic portion 71 is formed inside the housing 10 in the radial direction with respect to the solenoid 70, and faces the first movable portion 41 and the second movable portion 42.

Further, the first magnetic portion 71 has a first magnetic base portion 711 and a first magnetic convex portion 712.
The first magnetic base portion 711 is a portion of the first magnetic portion 71 extending in the axial direction of the housing 10.
The first magnetic convex portion 712 extends in a direction extending radially outward from the first magnetic base portion 711 on the rear end side, or in a direction extending from the first magnetic base portion 711 on the rear end side toward the second magnetic base portion 721. ing.

The second magnetic portion 72 has a cylindrical shape and is made of a magnetic material. The second magnetic portion 72 is formed in the housing 10 on the second pressure chamber 22 side, that is, in the rear end portion 106 of the housing 10. Further, the second magnetic portion 72 is formed on the radial outer side of the housing 10 with respect to the solenoid 70, and faces the second movable portion 42. Further, the second magnetic portion 72 is formed so as to cover the solenoid 70 with the first magnetic portion 71.

Further, the second magnetic portion 72 has a second magnetic base portion 721, a second magnetic convex portion 722, and a second magnetic concave portion 726.
The second magnetic base portion 721 is a portion of the second magnetic portion 72 extending in the axial direction of the housing 10.
The second magnetic convex portion 722 extends in the radial direction inward from the second magnetic base portion 721 on the distal end side, or in the direction from the second magnetic base portion 721 on the distal end side toward the first magnetic base portion 711. .. The second magnetic convex portion 722 faces the first magnetic base portion 711.

The second magnetic recess 726 is recessed in the direction from the second magnetic base portion 721 on the rear end side toward the radial outer side of the housing 10, or in the direction from the first magnetic convex portion 712 on the rear end side toward the second magnetic base portion 721. I'm out. Further, the second magnetic concave portion 726 is engaged with the first magnetic convex portion 712.

As shown in FIG. 3, the facing surface of the first movable portion 41 facing the first magnetic portion 71 is referred to as the first movable portion facing surface 413. The facing surface of the second movable portion 42 facing the first magnetic portion 71 and the second magnetic portion 72 is referred to as a second movable portion facing surface 423. The facing surface of the first magnetic portion 71 facing the first movable portion 41 and the second movable portion 42 is referred to as a first magnetic portion facing surface 713. The facing surface of the second magnetic portion 72 facing the second movable portion 42 is referred to as a second magnetic portion facing surface 723.

When the first movable portion 41 closes the sub-out orifice 31 and the second movable portion 42 closes the second out orifice 32, the first movable portion 41 and the second movable portion 42 are first movable. The portion facing surface 413 and the second movable portion facing surface 423 are formed so as to be on the same plane. Further, when the first movable portion 41 closes the sub-out orifice 31 and the second movable portion 42 closes the second out orifice 32, the first magnetic portion 71 and the second magnetic portion 72 are in the second position. The 1 magnetic portion facing surface 713 and the 2nd magnetic portion facing surface 723 are formed so as to be on the same plane.

When the first movable portion 41 closes the sub-out orifice 31 and the second movable portion 42 closes the second out orifice 32, the first movable portion facing surface 413 and the second movable portion facing surface 423 Let the same plane of the above be the movable part plane Se. When the first movable portion 41 closes the sub-out orifice 31 and the second movable portion 42 closes the second out orifice 32, the first magnetic portion facing surface 713 and the second magnetic portion facing surface 723 Let the same plane of the above be the magnetic part plane Sm. In the figure, the movable portion plane Se and the magnetic portion plane Sm are described by a alternate long and short dash line.

The outer surface of the movable collar portion 412 is referred to as the collar portion outer surface 414. The flange outer surface 414 faces the movable recess 422 and is an outer surface having the maximum outer diameter of the first movable portion 41. In the axial direction of the housing 10, the facing surface of the movable flange portion 412 facing the movable recess 422 is referred to as the flange portion facing surface 415. The inner side surface of the movable recess 422 is referred to as the concave inner side surface 424. The concave inner side surface 424 faces the flange outer outer surface 414 and is an inner surface forming the maximum inner diameter of the second movable portion 42. In the axial direction of the housing 10, the facing surface of the movable recess 422 facing the flange facing surface 415 is defined as the recess facing surface 425.

The outer surface of the first magnetic base portion 711 is referred to as the outer surface of the first magnetic portion 714. The inner surface of the first magnetic base portion 711 is referred to as the inner surface surface of the first magnetic portion 715. The outer surface of the second magnetic portion 72 is referred to as the outer surface of the second magnetic portion 724. The inner side surface of the second magnetic part 72 is referred to as the inner side surface of the second magnetic part 725. The inner side surface 725 of the second magnetic portion faces the outer surface 714 of the first magnetic portion. The midpoint of the outer surface 714 of the first magnetic portion and the inner surface 715 of the first magnetic portion is defined as the midpoint Om1 of the first magnetic portion. The midpoint of the outer surface 724 of the second magnetic portion and the inner surface 725 of the second magnetic portion is defined as the midpoint Om2 of the second magnetic portion. In the figure, the first magnetic part midpoint Om1 and the second magnetic part midpoint Om2 are indicated by black circles.

The first magnetic portion 71 is formed so that the midpoint Om1 of the first magnetic portion is located radially inside the housing 10 with respect to the concave inner side surface 424.
The second magnetic portion 72 is formed so that the midpoint Om2 of the second magnetic portion is located radially outside the housing 10 with respect to the flange portion outer surface 414.

The shortest distance from the outer surface 714 of the first magnetic portion to the inner side surface 725 of the second magnetic portion is defined as the first shortest distance G1. The first shortest distance G1 is the shortest distance from the first magnetic portion 71 to the second magnetic portion 72 in the radial direction of the housing 10. The shortest distance from the second magnetic portion facing surface 723 to the second movable portion facing surface 423 is defined as the second shortest distance G2. The second shortest distance G2 is the shortest distance from the second magnetic portion 72 to the second movable portion 42 in the axial direction of the housing 10. The second shortest distance G2 is smaller than the distance from the inner wall 105 of the housing 10 to the second movable portion 42.

The shortest distance from the outer surface 414 of the flange portion to the inner side surface 424 of the recess is defined as the third shortest distance G3. The third shortest distance G3 is the shortest distance from the first movable portion 41 to the second movable portion 42 in the radial direction of the housing 10. The shortest distance from the first magnetic portion facing surface 713 to the first movable portion facing surface 413 is defined as the fourth shortest distance G4. The fourth shortest distance G4 is the shortest distance from the first movable portion 41 to the first magnetic portion 71 in the axial direction of the housing 10. In one embodiment, the fourth shortest distance G4 is equal to the second shortest distance G2. The sum of the second shortest distance G2, the third shortest distance G3, and the fourth shortest distance G4 is defined as the shortest distance sum G2 + G3 + G4.

The shortest distance from the flange facing surface 415 to the recess facing surface 425 is defined as the fifth shortest distance G5. When the concave inner side surface 424 is projected onto the flange outer surface 414, the area of the flange outer surface 414 where the flange outer surface 414 and the concave inner side surface 424 overlap each other is defined as the area between movable portions. The area between the movable portions Am is the area of the portion where the outer surface surface of the flange portion 414 and the inner surface surface of the recess 424 face each other in the radial direction of the housing 10. Area of the second movable portion facing surface 423 where the first magnetic portion facing surface 713 and the second movable portion facing surface 423 overlap each other when the first magnetic portion facing surface 713 is projected onto the second movable portion facing surface 423. Is the area between facing portions Ao. The area between the facing portions Ao is the area of the portion where the first magnetic portion facing surface 713 and the second movable portion facing surface 423 face each other.

The first movable portion 41, the second movable portion 42, the first magnetic portion 71, and the second magnetic portion 72 have the following relational expression (3-) so that the first shortest distance G1 is larger than the shortest distance sum G2 + G3 + G4. It is formed so as to be 1).

Further, the first movable portion 41, the second movable portion 42, and the second magnetic portion 72 are arranged so that the fifth shortest distance G5 is larger than the second shortest distance G2, that is, with the following relational expression (3-2). It is formed so as to be.

Further, in the first movable portion 41, the second movable portion 42 and the first magnetic portion 71, the area between the movable portions Am is larger than the area between the facing portions Ao, that is, with the following relational expression (3-3). It is formed so as to be. The area between the movable portions Am when the first movable portion 41 moves in the opening direction is set to be larger than the area between the facing portions Ao.

G1> G2 + G3 + G4 ... (3-1)
G5> G2 ... (3-2)
Am> Ao ... (3-3)

As shown in FIG. 4, when the solenoid 70 is energized from the initial state, the solenoid 70 generates a magnetic field. At this time, a magnetic field is generated so that a force in the opening direction acts on the first magnetic portion 71 and the second magnetic portion 72.

The solenoid 70 generates a first magnetic circuit M1 which is a magnetic circuit via a first movable portion 41, a first magnetic portion 71, a second magnetic portion 72, and a second movable portion 42. Further, the solenoid 70 generates a second magnetic circuit M2 which is a magnetic circuit via the second movable portion 42, the first magnetic portion 71, and the second magnetic portion 72. The winding direction of the solenoid 70 is set so that such a magnetic circuit is generated. In the figure, in order to clarify the first magnetic circuit M1 and the second magnetic circuit M2, the first magnetic circuit M1 and the second magnetic circuit M2 are described by broken line arrows. The first magnetic circuit M1 and the second magnetic circuit M2 may be generated so as to be in the opposite direction to the description in the figure.

When the solenoid 70 generates a magnetic field and the first magnetic circuit M1 is generated, the first movable portion 41 attracts the first magnetic portion 71. When the solenoid 70 generates a magnetic field and the second magnetic circuit M2 is generated, the second movable portion 42 attracts the first magnetic portion 71 and the second magnetic portion 72. The force attracted by the first movable portion 41 and the first magnetic portion 71 is defined as the first attractive force Fm1. The force attracted by the second movable portion 42, the first magnetic portion 71, and the second magnetic portion 72 is referred to as a second attractive force Fm2. Due to the first suction force Fm1, the first movable portion 41 tends to move in the opening direction. Due to the second suction force Fm2, the second movable portion 42 tends to move in the opening direction.

The magnetic flux passing through the first movable portion 41 is defined as the first magnetic flux Φ1. The magnetic flux passing through the second movable portion 42 is defined as the second magnetic flux Φ2. As the solenoid current Ic increases, the first magnetic flux Φ1 increases. As the first magnetic flux Φ1 increases, the first attractive force Fm1 increases. Therefore, as the solenoid current Ic increases, the first attractive force Fm1 increases. Similarly, as the solenoid current Ic increases, the second magnetic flux Φ2 increases. As the second magnetic flux Φ2 increases, the second attractive force Fm2 increases. Therefore, as the solenoid current Ic increases, the second suction force Fm2 increases.

The total sum of the forces acting on the first movable portion 41 toward the opening / closing direction of the first movable portion 41 is defined as the first solenoid valve force Fe1. The total sum of the forces acting on the second movable portion 42 toward the opening / closing direction of the second movable portion 42 is defined as the second solenoid valve force Fe2. The first solenoid valve force Fe1 and the second solenoid valve force Fe2 are represented by, for example, the following relational expressions (4-1) and (4-2).
Fe1 = Fm1 + Ff1-Fs1 + Fs2 ... (4-1)
Fe2 = Fm2 + Ff2-Fs2 ... (4-2)

The opening direction of the first movable portion 41 or the second movable portion 42 is defined as the positive direction of the first solenoid valve force Fe1 and the second solenoid valve force Fe2. The first suction force Fm1, the second suction force Fm2, the first fluid assisting force Ff1, and the second fluid assisting force Ff2 act in the positive direction. The first urging force Fs1 and the second urging force Fs2 act in the negative direction.

In the initial state, the first attractive force Fm1, the first fluid assisting force Ff1, the first urging force Fs1 and the second urging force Fs2 are adjusted so that the first solenoid valve force Fe1 becomes less than zero. Similarly, in the initial state, the second attractive force Fm2, the second fluid assisting force Ff2, and the second urging force Fs2 are adjusted so that the second solenoid valve force Fe2 becomes less than zero. Further, in the initial state, the magnitude of the first solenoid valve force Fe1, that is, the absolute value of the first solenoid valve force Fe1 is set to be smaller than the magnitude of the second solenoid valve force Fe2.

The current control unit 75 can control the first solenoid valve force Fe1 or the second solenoid valve force Fe2 according to the solenoid current Ic. In the solenoid current Ic, a current threshold value, which is a preset threshold value, is set, and two current threshold values are set. One current threshold is defined as the first current threshold Ic_th1. The other current threshold is set to the second current threshold Ic_th2. The second current threshold value Ic_th2 is set to be larger than the first current threshold value Ic_th1. The first current threshold value Ic_th1 and the second current threshold value Ic_th2 are set according to the size or shape of the first movable portion 41, the second movable portion 42, the first magnetic portion 71, or the second magnetic portion 72. The first current threshold value Ic_th1 and the second current threshold value Ic_th2 may be arbitrarily set by experiments, simulations, or the like.

When the solenoid current Ic is equal to or less than the first current threshold value Ic_th1, that is, when the following relational expression (5-1) is used, the first solenoid valve force Fe1 and the second solenoid valve force Fe2 have the following relational expression (5-2). ), (5-3). At this time, since the first solenoid valve force Fe1 is zero or less, the first movable portion 41 closes the sub-out orifice 31. Since the second solenoid valve force Fe2 is less than zero, the second movable portion 42 closes the second out orifice 32.

Ic ≤ Ic_th1 ... (5-1)
Fe1 ≦ 0 ・ ・ ・ (5-2)
Fe2 <0 ... (5-3)

The solenoid current Ic is increased by the current control unit 75, and the first suction force Fm1 and the second suction force Fm2 are increased. When the solenoid current Ic exceeds the first current threshold value Ic_th1 and becomes the second current threshold value Ic_th2 or less, that is, when the following relational expression (6-1) is satisfied, the first solenoid valve force Fe1 and the second solenoid valve force Fe2. Is set so as to be the following relational expressions (6-2) and (6-3). Since the first solenoid valve force Fe1 is larger than zero, the first movable portion 41 opens the sub-out orifice 31. Since the second solenoid valve force Fe2 is zero or less, the second movable portion 42 closes the second out orifice 32.

Ic_th1 <Ic≤Ic_th2 ... (6-1)
Fe1> 0 ... (6-2)
Fe2 ≦ 0 ・ ・ ・ (6-3)

The solenoid current Ic is further increased by the current control unit 75, and the first suction force Fm1 and the second suction force Fm2 are further increased. When the solenoid current Ic exceeds the second current threshold value Ic_th2, that is, when the relational expression (7-1) is satisfied, the first solenoid valve force Fe1 and the second solenoid valve force Fe2 are described in the following relational expression (7-2), ( It becomes 7-3). The first movable portion 41 keeps the sub-out orifice 31 open. Since the second solenoid valve force Fe2 exceeds zero, the second movable portion 42 opens the second out orifice 32.

Ic_th2 <Ic ... (7-1)
Fe1> 0 ... (7-2)
Fe2> 0 ... (7-3)

The control of the current control unit 75 will be described with reference to FIG. In the figure, the solenoid current Ic is taken as the horizontal axis as a common axis. The opening and closing of the first attractive force Fm1, the first solenoid valve force Fe1 and the first movable portion 41 with respect to the solenoid current Ic are described by solid lines. The opening and closing of the second attractive force Fm2, the second solenoid valve force Fe2, and the second movable portion 42 with respect to the solenoid current Ic are described by a alternate long and short dash line. The time when the first movable portion 41 opens the sub-out orifice 31 or the second movable portion 42 opens the second out orifice 32 is described as "open". When the first movable portion 41 closes the sub-out orifice 31 or the second movable portion 42 closes the second out orifice 32, it is described as "closed". The positive direction is described as the "+" direction, and the negative direction is described as the "-" direction.

When the solenoid current Ic is zero, the first suction force Fm1 and the second suction force Fm2 are zero. At this time, the first solenoid valve force Fe1 and the second solenoid valve force Fe2 act in the negative direction, that is, in the closed direction. The absolute value of the first solenoid valve force Fe1 is set to be smaller than the absolute value of the second solenoid valve force Fe2. The first movable portion 41 closes the sub-out orifice 31. The second movable portion 42 closes the second out orifice 32.

As the current control unit 75 increases the solenoid current Ic, the first suction force Fm1 and the second suction force Fm2 increase. When the solenoid current Ic becomes Ic_th1, the first solenoid valve force Fe1 becomes zero. At this time, the second solenoid valve force Fe2 acts in the negative direction.

When the solenoid current Ic exceeds the first current threshold value Ic_th1, the first solenoid valve force Fe1 exceeds zero and acts in the positive direction.
As shown in FIG. 6, the first movable portion 41 moves in the opening direction and opens the sub-out orifice 31. The second movable portion 42 closes the second out orifice 32.

Returning to FIG. 5, when the current control unit 75 makes the solenoid current Ic higher than the first current threshold value Ic_th1 and the solenoid current Ic reaches the second current threshold value Ic_th2, the second solenoid valve force Fe2 becomes zero. .. As described above, the solenoid current Ic when the first solenoid valve force Fe1 becomes zero and the solenoid current Ic when the second solenoid valve force Fe2 becomes zero are set so as to be different.

When the solenoid current Ic exceeds the second current threshold value Ic_th2, the second solenoid valve force Fe2 exceeds zero and acts in the positive direction.
As shown in FIG. 7, the first movable portion 41 keeps the sub-out orifice 31 open. The second movable portion 42 moves in the opening direction and opens the second out orifice 32. When the solenoid current Ic becomes zero by the current control unit 75, the first movable unit 41 closes the sub-out orifice 31 and the second movable unit 42 closes the second out orifice 32 and returns to the initial state.

[1] The first movable portion 41, the second movable portion 42, the first magnetic portion 71, and the second magnetic portion 72 are formed so that the first shortest distance G1 is larger than the shortest distance sum G2 + G3 + G4. As a result, the first magnetic circuit M1 and the second magnetic circuit M2 are generated without short-circuiting the first magnetic circuit M1 and the second magnetic circuit M2. Since the first magnetic circuit M1 and the second magnetic circuit M2 are not short-circuited, the first movable portion 41 and the second movable portion 42 can easily move independently. Therefore, it is not necessary to consider the variation in the size of the contact area between the movable parts, and it is possible to relax the management of the tolerance of the movable part and the tolerance between the plurality of movable parts at the time of manufacturing or assembling. Therefore, the solenoid valve 81 has a simple structure. Further, the first movable portion 41 and the second movable portion 42 can be easily manufactured, and the solenoid valve 81 can be easily assembled.

[2] The first movable portion 41, the second movable portion 42, and the second magnetic portion 72 are formed so that the fifth shortest distance G5 is larger than the second shortest distance G2. As a result, when the second movable portion 42 moves, the first movable portion 41 and the second movable portion 42 do not engage with each other. Therefore, there is no accumulation of errors in the amount of movement of the first movable portion 41 and the second movable portion 42, and the accuracy of the amount of movement of the solenoid valve 81 is improved. Further, even when the second movable portion 42 is moving, the variation of the first magnetic flux Φ1 or the second magnetic flux Φ2 becomes small. Therefore, the variation between the first solenoid valve movement amount Le1 and the second solenoid valve movement amount Le2 is reduced, and the accuracy of the movement amount of the solenoid valve 81 is improved. Further, since the accuracy of the movement amount of the solenoid valve 81 is improved, the controllability of the first pressure P1 and the second pressure P2 is improved in the fuel injection device 1, and the accuracy of the fuel injection amount is improved.

[3] The first movable portion 41, the second movable portion 42, and the first magnetic portion 71 are formed so that the area between the movable portions Am is larger than the area between the facing portions Ao. As a result, the first magnetic circuit M1 and the second magnetic circuit M2 are generated in parallel, and the first movable portion 41 and the second movable portion 42 are more easily moved independently.

[4] The first magnetic portion 71 is formed so that the midpoint Om1 of the first magnetic portion is located radially inside the housing 10 with respect to the concave inner side surface 424. The second magnetic portion 72 is formed so that the midpoint Om2 of the second magnetic portion is located radially outside the housing 10 with respect to the flange portion outer surface 414. As a result, since the first magnetic circuit M1 and the second magnetic circuit M2 become a parallel circuit, the path through which only one of them passes is suppressed, and the first movable portion 41 and the second movable portion 42 become independent. It becomes easy to move.

[5] When the first movable portion 41 closes the sub-out orifice 31 and the second movable portion 42 closes the second out orifice 32, the first movable portion facing surface 413 and the second movable portion facing each other. The surface 423 is located on the same plane. Further, when the first movable portion 41 closes the sub-out orifice 31 and the second movable portion 42 closes the second out orifice 32, the first magnetic portion facing surface 713 and the second magnetic portion facing surface 723 is located on the same plane. As a result, the second shortest distance G2 and the fourth shortest distance G4 can be reduced.

Since the second shortest distance G2 and the fourth shortest distance G4 can be made small, the physique of the solenoid valve 81 can be made small, and the power consumed by the solenoid valve 81 can be made small. Further, since the first suction force Fm1 and the second suction force Fm2 can be increased, the first movable portion 41 and the second movable portion 42 can be easily moved, and the responsiveness of the solenoid valve 81 is improved.

[6] The solenoid current Ic when the first solenoid valve force Fe1 becomes zero and the solenoid current Ic when the second solenoid valve force Fe2 becomes zero are set so as to be different. As a result, the first movable portion 41 and the second movable portion 42 can easily move independently according to the solenoid current Ic.

[7] The first spring 51 and the second spring 52 are formed so that the first urging force Fs1 is different from the second urging force Fs2. As a result, the first movable portion 41 and the second movable portion 42 are more likely to move independently according to the first urging force Fs1 and the second urging force Fs2.

(Other embodiments)
[I] The fluid used in the present embodiment is not limited to the fuel, and may be a gas or another liquid.

[Ii] As shown in FIG. 8, when the solenoid current Ic exceeds the first current threshold value Ic_th1, the second solenoid valve force Fe2 may be set to exceed zero and act in the positive direction.

As shown in FIG. 9, when the solenoid current Ic exceeds the first current threshold value Ic_th1, the first movable portion 41 closes the sub-out orifice 31. The second movable portion 42 moves in the opening direction and opens the second out orifice 32.

Returning to FIG. 8, when the current control unit 75 makes the solenoid current Ic higher than the first current threshold value Ic_th1 and the solenoid current Ic reaches the second current threshold value Ic_th2, the first solenoid valve force Fe1 becomes zero. ..

When the solenoid current Ic exceeds the second current threshold value Ic_th2, the first solenoid valve force Fe1 exceeds zero and acts in the positive direction. The second movable portion 42 keeps the second out orifice 32 open. The first movable portion 41 moves in the opening direction and opens the sub-out orifice 31. When the solenoid current Ic becomes zero by the current control unit 75, the first movable unit 41 closes the sub-out orifice 31 and the second movable unit 42 closes the second out orifice 32 and returns to the initial state.

[Iii] As shown in FIGS. 10 and 11, the first movable portion 41 may not have a portion corresponding to the movable flange portion 412. Further, the movable recess 422 may not be formed in the second movable portion 42. At this time, the first movable base portion 411 is formed in a polygonal columnar shape or a columnar shape. The second movable base portion 421 is formed in a cylindrical shape. The second movable base portion 421 is formed so that the outer diameter of the second movable base portion 421 on the rear end side is larger than the outer diameter of the second movable base portion 421 on the distal end side.

The first urging force Fs1 and the second urging force Fs2 are expressed, for example, as the following relational expressions (8-1) and (8-2). The second spring 52 urges the second movable portion 42 in the closing direction by a tensile force.
Fs1 = F1 + k1 × Le1 ... (8-1)
Fs2 = F2 + k2 x Le2 ... (8-2)

As shown in FIG. 12, the outer surface of the first movable base portion 411 is referred to as the first movable outer surface 416. The first movable outer surface 416 is an outer surface having the maximum outer diameter of the first movable portion 41. The inner side surface of the second movable base portion 421 is referred to as a second movable inner side surface 426. The second movable inner side surface 426 is an inner surface that faces the first movable outer surface 416 and forms the maximum inner diameter of the second movable portion 42. The shortest distance from the first movable outer surface 416 to the second movable inner side surface 426 is defined as the third shortest distance G3. At this time, the fifth shortest distance G5 is a very large value. When the second movable inner surface 426 is projected onto the first movable outer surface 416, the area of the first movable outer surface 416 where the first movable outer surface 416 and the second movable inner surface 426 overlap each other is the area between the movable portions. Let it be Am. The area between the movable portions Am at this time is the area of the portion where the first movable outer surface 416 and the second movable inner surface 426 face each other in the radial direction of the housing 10.

The first magnetic portion 71 is formed so that the midpoint Om1 of the first magnetic portion is located radially inside the housing 10 with respect to the second movable inner side surface 426.
The second magnetic portion 72 is formed so that the midpoint Om2 of the second magnetic portion is located radially outside the housing 10 with respect to the first movable outer surface 416.
The first movable portion 41, the second movable portion 42, and the first magnetic portion 71 have such that the area between the movable portions Am is larger than the area between the facing portions Ao, that is, the above relational expression (3-3) is obtained. Is formed in. Even in such a configuration, the same effect as that of one embodiment is obtained.

[Iv] The position where the first spring 51 and the second spring 52 are provided is not limited. The first spring 51 may be provided at a position that urges the first movable portion 41 in the closing direction. The first spring 51 may be provided so as to urge the first movable portion 41 in the closing direction. The second spring 52 may be provided at a position that urges the second movable portion 42 in the closing direction. The second spring 52 may be provided so as to urge the second movable portion 42 in the closing direction.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various forms without departing from the spirit of the invention.

10 ... Housing,
21 ... 1st pressure chamber, 22 ... 2nd pressure chamber,
30 ・ ・ ・ Plate part (orifice plate)
31 ... 1st fluid flow path, 32 ... 2nd fluid flow path 41 ... 1st movable part, 42 ... 2nd movable part,
51 ... 1st urging member (1st spring),
52 ... Second urging member (second spring),
70 ... Solenoid,
71 ... 1st magnetic part, 72 ... 2nd magnetic part,
81 ... Solenoid valve.

Claims (9)

A bottomed cylindrical housing (10) having a first pressure chamber (21) through which fluid can flow in and out and a second pressure chamber (22) in communication with the first pressure chamber.
A first fluid flow path (31) between the first pressure chamber and the second pressure chamber, which is formed in the housing and communicates with the first pressure chamber and the second pressure chamber, and the said. A plate portion (30) including a shaft (Of2) different from the shaft (Of1) of the first fluid flow path and having a second fluid flow path (32) communicating with the first pressure chamber and the second pressure chamber. When,
A first movable portion (41) housed in the second pressure chamber and capable of opening and closing the first fluid flow path to control the pressure of the first pressure chamber and the pressure of the second pressure chamber.
A first urging member (51) that urges the first movable portion in a direction in which the first movable portion closes the first fluid flow path.
It is housed in the second pressure chamber and is formed on the outside of the first movable portion, and the pressure in the first pressure chamber and the pressure in the second pressure chamber can be controlled by opening and closing the second fluid flow path. 2nd moving part (42) and
A second urging member (52) that urges the second movable portion in a direction in which the second movable portion closes the second fluid flow path.
A solenoid (70) provided in the housing on the second pressure chamber side and capable of generating a magnetic field in the housing, the first movable portion, and the second movable portion.
The first magnetic portion (71) which is the housing on the second pressure chamber side and is formed radially inside the housing with respect to the solenoid and faces the first movable portion and the second movable portion. When,
The housing on the second pressure chamber side, the second magnetic portion (72) formed on the radial outer side of the housing from the solenoid and facing the second movable portion, and the second magnetic portion (72).
Equipped with
In the portion facing the second movable portion, the outer surface (714) of the first magnetic portion and the inner surface surface (725) of the second magnetic portion are separated in the radial direction of the housing, and the radial direction of the housing. The shortest distance from the outer surface of the first magnetic portion to the inner surface of the second magnetic portion is defined as the first shortest distance (G1).
The shortest distance from the facing surface (723) of the second magnetic portion to the facing surface (423) of the second movable portion in the axial direction of the housing is defined as the second shortest distance (G2).
In the portion facing the first magnetic portion, the outer surface (414) of the first movable portion and the inner surface surface (424) of the second movable portion are separated in the radial direction of the housing, and are radially separated from each other. The shortest distance from the outer surface of the first movable portion to the inner surface of the second movable portion is defined as the third shortest distance (G3).
Assuming that the shortest distance from the facing surface (713) of the first magnetic portion to the facing surface (413) of the first movable portion in the axial direction of the housing is the fourth shortest distance (G4).
The first shortest distance is a solenoid valve larger than the sum of the second shortest distance, the third shortest distance, and the four shortest distances (G2 + G3 + G4). The first movable portion further has a first movable base portion (411) and a movable flange portion (412) extending from the first movable base portion on the opposite side of the plate portion toward the second movable portion. ,
The solenoid valve according to claim 1, wherein the second movable portion further has a movable recess (422) facing the movable collar portion in the radial direction and the axial direction of the housing while being separated from the movable flange portion. The shortest distance (G5) from the movable flange portion to the movable recess in the axial direction of the housing is larger than the shortest distance (G2) from the second magnetic portion to the second movable portion in the axial direction of the housing. The solenoid valve according to claim 2. The area (Am) of the movable flange portion of the portion facing the movable recess in the radial direction of the housing is the area of the second movable portion of the portion facing the first magnetic portion in the axial direction of the housing. The solenoid valve according to claim 2 or 3, which is larger than (Ao). In the second movable portion or the portion facing the first movable portion, in the first magnetic portion, the midpoint (Om1) of the outer surface (714) and the inner surface surface (715) of the first magnetic portion is the first. 2 It is formed so as to be located radially inside the housing with respect to the inner side surface (424, 426) forming the maximum inner diameter of the movable portion.
In the second movable portion or the portion facing the housing located on the radial outer side of the second pressure chamber, the second magnetic portion is formed on the outer surface (724) and the inner surface surface (724) of the second magnetic portion. Claims 1 to 4 are formed so that the midpoint (Om2) of 725) is located radially outside the housing with respect to the outer surface (414, 416) forming the maximum outer diameter of the first movable portion. The solenoid valve according to any one of the above. The facing surface of the first movable portion facing the first magnetic portion is defined as the facing surface of the first movable portion (413), and the facing surface of the first magnetic portion and the second movable portion facing the second magnetic portion. Is referred to as a second movable portion facing surface (423), and the facing surface of the first magnetic portion facing the first movable portion and the second movable portion is referred to as a first magnetic portion facing surface (713), and the second movable portion is used. Assuming that the facing surface of the second magnetic portion facing the portion is the facing surface of the second magnetic portion (723), it is assumed.
When the first movable portion closes the first fluid flow path and the second movable portion closes the second fluid flow path.
The first movable portion and the second movable portion are formed so that the facing surface of the first movable portion and the facing surface of the second movable portion are on the same plane (Sm), and the first movable portion and the second movable portion are formed so as to be on the same plane (Sm).
The first magnetic part and the second magnetic part are formed so that the facing surface of the first magnetic part and the facing surface of the second magnetic part are on the same plane (Sa), according to claims 1 to 5. The solenoid valve described in any one of the items. The solenoid current (Ic), which is the current flowing through the solenoid, can be controlled, and the first solenoid valve force (Fe1) or the second solenoid valve force (Fe1), which is a force acting on the first movable portion, is controlled according to the solenoid current. A current control unit (75) capable of controlling the second solenoid valve force (Fe2), which is a force acting on the vehicle, is further provided.
The solenoid valve according to any one of claims 1 to 6, wherein the solenoid current when the first solenoid valve force becomes zero is different from the solenoid current when the second solenoid valve force becomes zero. .. The first urging member and the second urging member are formed so that the urging force (Fs1) of the first urging member is different from the urging force (Fs2) of the second urging member. Item 5. The solenoid valve according to any one of Items 1 to 7. It has a injection hole (17) at the tip where fuel is injected, and has a first pressure chamber (21) through which fuel can flow in and out and a second pressure chamber (22) that allows communication with the first pressure chamber. The bottom tubular housing (10) and
A first fluid flow path (31) between the first pressure chamber and the second pressure chamber, which is formed in the housing and communicates with the first pressure chamber and the second pressure chamber, and the said. A plate portion (30) including a shaft (Of2) different from the shaft (Of1) of the first fluid flow path and having a second fluid flow path (32) communicating with the first pressure chamber and the second pressure chamber. When,
A first movable portion (41) housed in the second pressure chamber and capable of opening and closing the first fluid flow path to control the pressure of the first pressure chamber and the pressure of the second pressure chamber.
A first urging member (51) that urges the first movable portion in a direction in which the first movable portion closes the first fluid flow path.
It is housed in the second pressure chamber and is formed on the outside of the first movable portion, and the pressure in the first pressure chamber and the pressure in the second pressure chamber can be controlled by opening and closing the second fluid flow path. 2nd moving part (42) and
A second urging member (52) that urges the second movable portion in a direction in which the second movable portion closes the second fluid flow path.
A solenoid (70) provided in the housing on the second pressure chamber side and capable of generating a magnetic field in the housing, the first movable portion, and the second movable portion.
The first magnetic portion (71) which is the housing on the second pressure chamber side and is formed radially inside the housing with respect to the solenoid and faces the first movable portion and the second movable portion. When,
The housing on the second pressure chamber side, the second magnetic portion (72) formed on the radial outer side of the housing from the solenoid and facing the second movable portion, and the second magnetic portion (72).
A needle that can reciprocate within the housing and opens and closes the injection hole when the first movable portion or the second movable portion controls the pressure in the first pressure chamber and the pressure in the second pressure chamber. 60) and
Equipped with
In the portion facing the second movable portion, the outer surface (714) of the first magnetic portion and the inner surface surface (725) of the second magnetic portion are separated in the radial direction of the housing, and the radial direction of the housing. The shortest distance from the outer surface of the first magnetic portion to the inner surface of the second magnetic portion is defined as the first shortest distance (G1).
The shortest distance from the facing surface (723) of the second magnetic portion to the facing surface (423) of the second movable portion in the axial direction of the housing is defined as the second shortest distance (G2).
In the portion facing the first magnetic portion, the outer surface (414) of the first movable portion and the inner surface surface (424) of the second movable portion are separated in the radial direction of the housing, and are radially separated from each other. The shortest distance from the outer surface of the first movable portion to the inner surface of the second movable portion is defined as the third shortest distance (G3).
Assuming that the shortest distance from the facing surface (713) of the first magnetic portion to the facing surface (413) of the first movable portion in the axial direction of the housing is the fourth shortest distance (G4).
The first shortest distance is a fuel injection device larger than the sum of the second shortest distance, the third shortest distance, and the four shortest distances (G2 + G3 + G4).

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