Solenoid device and electromagnetic valve for fuel injection device

Abstract

A solenoid device that drives a valve unit provided to a solenoid valve of a fuel injection device by electromagnetic force, the solenoid device includes: a cylindrical magnetic core; a coil wound around the magnetic core; a housing that houses the magnetic core and the coil and covers at least an end portion of one side of the magnetic core in an axial direction of a central axis; a terminal fixing member disposed between the magnetic core and the housing in the axial direction and fixing a terminal connected to the coil; and a cylindrical member disposed on an inner peripheral side of the magnetic core in a manner that penetrates the magnetic core and the housing in the axial direction, having a protruding portion protruding in a radial direction orthogonal to the axial direction and held by the housing and the terminal fixing member from both sides in the axial direction, and disposed at a position where an end portion on the other side in the axial direction can contact the valve unit.

Description

Technical Field

[0001] This disclosure relates to solenoid valves for solenoid devices and fuel injection devices. Background Technology

[0002] A common rail fuel injection system suitable for diesel engines includes a fuel pump, a common rail, and a fuel injection valve. The fuel pump draws fuel from the fuel tank and pressurizes it, supplying it as high-pressure fuel to the common rail. The common rail maintains the high-pressure fuel supplied by the fuel pump at a specified pressure. The fuel injection valve, by opening and closing the injection valve, injects the high-pressure fuel from the common rail into the combustion chamber of the diesel engine.

[0003] The fuel injection valve has a solenoid valve, which includes, for example, a solenoid device that generates electromagnetic force by the flow of current through a coil wound around a magnetic core, and a valve unit formed using a magnetic material. In such a solenoid valve, for example, a structure is formed that creates a flow path for pressing fuel by applying an elastic force to the valve unit. When no electromagnetic force is generated in the solenoid device, the flow path is closed by the elastic force pressing the fuel. Alternatively, when an electromagnetic force is generated by the solenoid device, the flow path is opened by attracting the valve unit towards the solenoid device and moving the valve unit away from it.

[0004] When the valve unit is attracted to the solenoid device, in order to ensure a small gap without contacting the electromagnetic force generating surface of the solenoid device, it is known to form a structure in which a cylindrical sleeve is embedded in the magnetic core to form a stop that allows the valve unit to abut against only that part (for example, see Patent Document 1, etc.).

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2006-194237 Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] In the structure described in Patent Document 1, when the valve unit contacts the sleeve, an impact is applied inside the solenoid device such as the magnetic core via the sleeve. This could lead to inconsistent valve unit lifting due to the weak fixing force of the sleeve. Therefore, a solenoid device with a highly impact-resistant stop structure is needed.

[0010] This disclosure was made in view of the above circumstances, and its object is to provide a solenoid valve for a solenoid device and a fuel injection device having a stop structure with excellent impact resistance.

[0011] Technical solutions for solving technical problems

[0012] The solenoid device disclosed herein is a solenoid device that drives a valve unit of a solenoid valve disposed in a fuel injection device by electromagnetic force. The solenoid device comprises: a cylindrical magnetic core; a coil wound around the magnetic core; a housing that houses the magnetic core and the coil, and at least covers one end of the magnetic core along its central axis in the axial direction; a terminal fixing member disposed between the magnetic core and the housing in the axial direction, and fixing a terminal connected to the coil; and a cylindrical member disposed on the inner circumference of the magnetic core such that it penetrates the magnetic core and the housing along the axial direction, having a protrusion that radially protrudes orthogonally to the axial direction and is held by the housing and the terminal fixing member from both sides of the axial direction, and an end disposed on the other side of the axial direction that can contact the valve unit.

[0013] The solenoid valve of the fuel injection device disclosed herein includes the aforementioned solenoid assembly and valve unit. The solenoid valve of the fuel injection device further includes a valve unit formed using a magnetic material, which is disposed opposite to the end on the other side of the magnetic core in the axial direction. An elastic force is applied in a direction away from the magnetic core along the axial direction. When no electromagnetic force is generated in the solenoid assembly, it is in a closed state by pressing the fuel flow path by the elastic force. When an electromagnetic force is generated in the solenoid assembly, it is attracted to the magnetic core by the electromagnetic force until it contacts the cylindrical member and moves away from the flow path, thereby opening the flow path.

[0014] Invention Effects

[0015] According to this disclosure, a solenoid valve for a solenoid device and a fuel injection device with excellent impact resistance can be provided. Attached Figure Description

[0016] Figure 1 This is a schematic structural diagram showing an example of the fuel injection device of this embodiment.

[0017] Figure 2 This is a longitudinal sectional view showing an example of a fuel injection valve.

[0018] Figure 3 This is a longitudinal sectional view showing an example of a solenoid valve.

[0019] Figure 4 This is a longitudinal sectional view showing an example of a cylindrical component.

[0020] Figure 5 It is shown in Figure 4 A diagram of the structure along section AA.

[0021] Figure 6 This is a longitudinal sectional view illustrating an example of the operation of a solenoid valve. Detailed Implementation

[0022] The following describes embodiments of the solenoid device and the solenoid valve of the fuel injection device of this disclosure based on the accompanying drawings. However, this invention is not limited to these embodiments. Furthermore, the constituent elements of the following embodiments include components that can be easily substituted or are substantially the same as those skilled in the art.

[0023] Figure 1 This is a schematic structural diagram showing an example of the fuel injection device 10 of this embodiment. Figure 1 As shown, the fuel injection device 10 is mounted on a diesel engine (internal combustion engine). The fuel injection device 10 includes a fuel pump 11, a common rail 12, and multiple fuel injection valves 13.

[0024] Fuel pump 11 is connected to fuel tank 14 via fuel line L11. Fuel pump 11 draws fuel stored in fuel tank 14 from fuel line L11 and pressurizes it to generate high-pressure fuel. Fuel pump 11 is connected to common rail 12 via high-pressure fuel line L12. Common rail 12 maintains the high-pressure fuel supplied by fuel pump 11 at a specified pressure. Common rail 12 is connected to fuel injection valve 13 via multiple (four in this embodiment) fuel supply lines L13. Fuel injection valve 13 injects high-pressure fuel from common rail 12 into each cylinder (combustion chamber) of the diesel engine by switching solenoid valves.

[0025] Figure 2 This is a longitudinal sectional view showing an example of a fuel injection valve 13. (See attached image.) Figure 2 As shown, the fuel injection valve 13 has a shape that extends along the axial direction of the central axis AX and has an injection section 20 and a solenoid valve 40. Hereinafter, when describing the structure of the fuel injection valve 13, the fuel injection port 30 side in the axial direction of the central axis AX will be referred to as the front end side, and the solenoid valve 40 side will be referred to as the base end side.

[0026] The injection unit 20 has a housing 21 and a piston valve 22. The housing 21 has a fuel inlet 24, an injection side flow path 25, a control side flow path 26, an injection side pressure chamber 27, a control side pressure chamber 28, a cylinder chamber 29, a fuel injection port 30, a fuel outlet 31, and a solenoid valve side pressure chamber 32.

[0027] Fuel from fuel supply line L13 flows into fuel inlet 24. Injection-side flow path 25 connects fuel inlet 24 and injection-side pressure chamber 27. Control-side flow path 26 connects fuel inlet 24 and control-side pressure chamber 28.

[0028] The injection-side pressure chamber 27 is connected to the fuel injection port 30. The fuel injection port 30 is located at the end of the front end side of the housing 21 and injects fuel toward each cylinder of the diesel engine.

[0029] The control-side pressure chamber 28 is connected to the fuel outlet 31. The fuel outlet 31 is located at the base end of the housing 21 and is connected to the solenoid valve-side pressure chamber 32. The solenoid valve-side pressure chamber 32 is connected to the solenoid valve 40 (the space 46d described later).

[0030] Cylinder chamber 29 is connected to injection-side pressure chamber 27 and control-side pressure chamber 28. Cylinder chamber 29 houses piston valve 22. Cylinder chamber 29 is connected to solenoid valve-side pressure chamber 32 via flow path 29a.

[0031] Piston valve 22 is housed in cylinder chamber 29 and is configured to move toward either the injection-side pressure chamber 27 or the control-side pressure chamber 28. Piston valve 22 includes a spring seat component 22a, a control-side piston component 22b, a connecting component 22c, and a valve core 22d. The spring seat component 22a, control-side piston component 22b, and connecting component 22c are integral. The spring seat component 22a receives the elastic force of the elastic component 23 (described later). The control-side piston component 22b receives the pressure of the control-side pressure chamber 28. The connecting component 22c connects the spring seat component 22a and the control-side piston component 22b. The valve core 22d protrudes from the front end of the spring seat component 22a in the axial direction of the central axis AX. The valve core 22d abuts against the spring seat component 22a by the combined force of the pressure and elastic force from each pressure chamber. The front end of the valve core 22d is shaped to close the fuel injection port 30. The valve core 22d bears the pressure of the injection side pressure chamber 27.

[0032] When the pressure in the injection-side pressure chamber 27 is less than the combined force of the pressure in the control-side pressure chamber 28 and the elastic force of the elastic member 23, the piston valve 22 is pressed against the injection-side pressure chamber 27. In this case, the fuel injection port 30 through the valve core 22d is closed. When the pressure in the injection-side pressure chamber 27 is greater than the combined force of the pressure in the control-side pressure chamber 28 and the elastic force of the elastic member 23, the piston valve 22 is pressed towards the control-side pressure chamber 28. In this case, the valve core 22d moves away from the fuel injection port 30, and the fuel injection port 30 is opened.

[0033] The solenoid valve 40 has a solenoid device 41 and a valve unit 42. Figure 3 This is a longitudinal sectional view showing an example of a solenoid valve 40. Figure 3 Enlarged display Figure 2 Part of it. For example... Figure 3 As shown, the solenoid device 41 drives the valve unit 42 along the axial direction of the central axis AX by electromagnetic force. The solenoid device 41 has a magnetic core 43, a coil 44, a housing 45, a cylindrical component 46, and a terminal fixing component 47.

[0034] The magnetic core 43 has a cylindrical portion 43a, a flange portion 43b, and a side portion 43c. The cylindrical portion 43a is formed into a cylindrical shape, for example. The flange portion 43b is formed into a circular plate shape, for example, and is disposed on the base end side of the magnetic core 43. The cylindrical portion 43a and the flange portion 43b are respectively arranged such that their central axes coincide with the central axis AX of the fuel injection valve 13.

[0035] The side portion 43c is cylindrical, enclosing the cylindrical portion 43a. The side portion 43c and the cylindrical portion 43a are arranged radially with a gap and extend towards the front end. The cylindrical portion 43a, the flange portion 43b, and the side portion 43c are formed using a magnetic material. The magnetic core 43 houses the coil 44 within the space surrounded by the cylindrical portion 43a, the flange portion 43b, and the side portion 43c. The space within the magnetic core 43 where the coil 44 is disposed is closed by a sealing portion 49. The sealing portion 49 is formed, for example, using a resin material. Furthermore, a terminal fixing member 47 is disposed between the magnetic core 43 and the housing 45 (described later) along the axial direction of the central axis AX, and fixes the terminal 44a connected to the coil 44. Additionally, the terminal 44a is pulled out through the housing 45 to the outside. The terminal fixing member 47 is formed, for example, using a resin material.

[0036] The coil 44 is arranged while wound around the cylindrical portion 43a. The coil 44 passes through the housing 45 (described later) and is connected to a power source (not shown). The solenoid device 41 generates electromagnetic force by the flow of current through the coil 44.

[0037] The housing 45 houses the magnetic core 43 and the coil 44. The housing 45 has a magnetic core housing portion 45a and a holding portion 45b. The magnetic core housing portion 45a and the holding portion 45b are integrally formed using a non-magnetic material. The magnetic core housing portion 45a houses the magnetic core 43, which includes the coil 44. The magnetic core housing portion 45a is arranged to cover the flange portion 43b and the side portion 43c of the magnetic core 43. The holding portion 45b is disposed at the base end side of the magnetic core housing portion 45a. The holding portion 45b holds the cylindrical member 46. The holding portion 45b is provided with a segment 45d corresponding to the protrusion 46a (described later) of the cylindrical member 46. The segment 45d is shaped and sized such that it is held in a state where the protrusion 46a and the holding portion 45b are in complete contact.

[0038] On the housing 45, the holding portion 45b houses the cylindrical member 46, and the magnetic core housing portion 45a houses the terminal fixing member 47 and the magnetic core 43. Thus, a structure can be realized in which the protrusion 46a is held between the holding portion 45b and the terminal fixing member 47 of the housing 45 in the axial direction of the central axis AX.

[0039] The cylindrical component 46 is arranged such that the magnetic core 43 and the housing 45 pass through it in the axial direction of the central axis AX. Figure 4This is a longitudinal sectional view showing an example of the cylindrical component 46. Figure 4 from Figure 3 The solenoid valve 40 is shown with the cylindrical component 46 withdrawn. Figure 3 as well as Figure 4 As shown, the cylindrical component 46 is, for example, cylindrical, and is configured such that its central axis coincides with the central axis AX of the fuel injection valve 13.

[0040] The cylindrical member 46 has a protrusion 46a. The protrusion 46a protrudes radially from the outer periphery of the cylindrical member 46 in a direction orthogonal to the axis of the central axis AX. The protrusion 46a is held from both sides in the axial direction of the central axis AX by the holding portion 45b of the housing 45 and the terminal fixing member 47. That is, in the protrusion 46a, the base end side and the side side in the axial direction of the central axis AX are held by the segment 45d, and the front end side is held by the terminal fixing member 47. With this structure, movement in the axial direction of the central axis AX of the cylindrical member 46 is restricted. Therefore, for example, the relative sliding of the inner periphery of the cylindrical member 46 and the magnetic core 43 in the axial direction of the central axis AX can be suppressed, and wear of the magnetic core 43 can be suppressed. In addition, it is possible to suppress the intrusion of fuel into the wear area of ​​the magnetic core 43.

[0041] The cylindrical member 46 is positioned at a point where its end face 46b on the front end side can contact the valve unit 42. In this embodiment, the end face 46b is, for example, coplanar with the front end face of the side portion 43c of the magnetic core 43 and the front end face of the closure portion 49. The cylindrical member 46 may also be positioned where the end face 46b protrudes towards the front end relative to the front end face of the side portion 43c and the front end face of the closure portion 49.

[0042] The cylindrical member 46 has a support portion 46d on its inner periphery. The support portion 46d is segmented in cross-section, with the diameter of the cylindrical member 46 being reduced. The cylindrical member 46 houses an elastic member 48 in a space 46e between the end face 46b and the support portion 46d. The elastic member 48 is housed in the space 46e with its base end supported by the support portion 46d. The elastic member 48 applies an elastic force to its front end relative to the valve unit 42 in the axial direction toward the central axis AX.

[0043] The cylindrical component 46 has a connecting portion 46c. The connecting portion 46c protrudes from the retaining portion 45b of the housing 45 toward the base end side. The connecting portion 46c is connected to the external fuel discharge flow path 50. The connecting portion 46c has a space portion 46f on its inner circumferential side. The space portion 46f is connected to the space portion 46e via the connecting flow path 46g. Therefore, the inner side of the cylindrical component 46 communicates from the front end side to the base end side. The space portion 46e of the cylindrical component 46 is connected to the solenoid valve side pressure chamber 32. Therefore, the cylindrical component 46 functions as a connector connecting the solenoid valve side pressure chamber 32 and the external fuel discharge flow path 50.

[0044] Figure 5 It shows along Figure 4 A diagram of the structure of section AA. (See diagram below.) Figure 5 As shown, the protrusion 46a has a locking portion 46h that engages with the housing 45 in the axial rotational direction of the central axis AX. Viewed from the axial direction of the central axis AX, the locking portion 46h has, for example, a shape that cuts a portion of the arc of the protrusion 46a into a straight line. The housing 45 (the core-side portion 45a and the retaining portion 45b) has an opening with a straight portion corresponding to the locking portion 46h, viewed from the axial direction of the central axis AX. By locking the locking portion 46h against this straight portion of the housing 45, rotation in the axial rotational direction of the cylindrical member 46 is suppressed. Therefore, sliding in the rotational direction between the cylindrical member 46 and the magnetic core 43 is suppressed.

[0045] like Figure 3 As shown, valve unit 42 moves along the central axis AX by electromagnetic force generated by solenoid device 41. Valve unit 42 has an armature 42a, a valve core 42b, and a section 42c. Armature 42a is formed using a magnetic material. Armature 42a is, for example, a circular plate. Armature 42a is disposed opposite to the front end of the magnetic core 43 of solenoid device 41. Valve core 42b extends from armature 42a toward the front end. The front end of valve core 42b is shaped to close the fuel outlet 31.

[0046] The segment 42c is formed in a state where it protrudes from the center of the armature 42a toward the solenoid device 41. When the valve unit 42 is attracted toward the solenoid device 41, the segment 42c is shaped and sized to contact the end face 46b of the cylindrical member 46. Furthermore, the segment 42c bears the elastic force from the elastic member 48. The elastic force of the elastic member 48 is transmitted to the armature 42a and the valve core 42b via the segment 42c. The elastic force of the elastic member 48 is applied to the front end of the armature 42a and the valve core 42b toward the axial direction of the central axis AX. Alternatively, the segment 42c may not be provided.

[0047] The operation of the fuel injection valve 13 configured as described above is explained. When no current flows through the coil 44 of the solenoid device 41, no electromagnetic force is generated in the solenoid device 41. In this case, in the valve unit 42, the valve core 42b is pressed towards the front end by the elastic force of the elastic member 48, thus closing the fuel outlet 31.

[0048] With the fuel outlet 31 closed, the combined force of the pressure on the control-side pressure chamber 28 and the elastic force of the elastic component 23 is greater than the pressure on the injection-side pressure chamber 27. Therefore, the piston valve 22 is closed by pressing against the fuel injection port 30.

[0049] Furthermore, when current flows through the coil 44 of the solenoid device 41, an electromagnetic force is generated in the solenoid device 41. Figure 6 This is a longitudinal sectional view illustrating an example of the operation of solenoid valve 40. Figure 6 The image shows an example of current flowing through coil 44. For example... Figure 6 As shown, when an electromagnetic force is generated in the solenoid device 41, in the valve unit 42, the armature 42a is attracted towards the magnetic core 43 by this electromagnetic force, and the valve core 42b moves away from the fuel outlet 31. As a result, the fuel outlet 31 becomes open.

[0050] By opening the fuel outlet 31, the pressure in the control-side pressure chamber 28 is reduced. When the combined force of the pressure in the control-side pressure chamber 28 and the elastic force of the elastic member 23 is less than the pressure in the injection-side pressure chamber 27, the piston valve 22 moves towards the control-side pressure chamber 28. In this case, the valve core 22d of the piston valve 22 moves away from the fuel injection port 30, and the fuel injection port 30 becomes open. With the fuel injection port 30 open, fuel flowing from the fuel inlet 24 through the injection-side flow path 25 into the injection-side pressure chamber 27 is injected from the fuel injection port 30.

[0051] In the above operation, when the valve unit 42 is attracted towards the magnetic core 43 by the electromagnetic force of the solenoid device 41, such as Figure 6 As shown, the segment 42c of the valve unit 42 contacts the end face 46b of the cylindrical member 46. In this case, the cylindrical member 46 functions as a stop that restricts movement toward the base end of the valve unit 42.

[0052] When segment 42c contacts the end face 46b of cylindrical member 46, an impact is applied to the interior of the solenoid device 41, such as the magnetic core 43, via the cylindrical member 46. In the solenoid device 41 of this embodiment, the cylindrical member 46 is held in the protrusion 46a by the housing 45 and the terminal fixing member 47 from both sides in the axial direction of the central axis AX. Therefore, the impact when the valve unit 42 contacts the cylindrical member 46 can be absorbed in the housing 45 and the terminal fixing member 47. In addition, when the valve unit 42 contacts, the movement of the cylindrical member 46 in the axial direction of the central axis AX is restricted. Therefore, slippage between the cylindrical member 46 and the magnetic core 43 is suppressed, and wear on the inner circumferential surface of the magnetic core 43 is suppressed.

[0053] As described above, the solenoid device 41 of this embodiment is a solenoid device 41 that drives the valve unit 42 of the solenoid valve 40 provided in the fuel injection device 10 by electromagnetic force. The solenoid device 41 includes: a cylindrical magnetic core 43; a coil 44 wound around the magnetic core 43; a housing 45 that houses the magnetic core 43 and the coil 44 and at least covers one end of the magnetic core 43 in the axial direction of the central axis AX; a terminal fixing member 47 disposed between the magnetic core 43 and the housing 45 in the axial direction and fixing the terminal 44a connected to the coil 44; and a cylindrical member 46 disposed on the inner circumferential side of the magnetic core 43 in such a way that it penetrates the magnetic core 43 and the housing 45 in the axial direction, having a protrusion 46a that protrudes radially orthogonal to the axial direction and is held by the housing 45 and the terminal fixing member 47 from both sides in the axial direction, and is disposed at a position where the end face 46b can contact the valve unit 42.

[0054] According to this structure, the cylindrical member 46 is held in the protrusion 46a from both sides along the axial direction of the central axis AX by the housing 45 and the terminal fixing member 47. Therefore, the impact when the valve unit 42 contacts the cylindrical member 46 can be absorbed in the housing 45 and the terminal fixing member 47. Furthermore, when the valve unit 42 contacts the cylindrical member 46, movement of the cylindrical member 46 along the axial direction of the central axis AX is restricted. Therefore, slippage between the cylindrical member 46 and the magnetic core 43 is suppressed, as is wear on the inner circumferential surface of the magnetic core 43. Thus, a solenoid device 41 with excellent impact resistance can be provided.

[0055] In the solenoid device 41 of this embodiment, the protrusion 46a has a locking portion 46h that locks against the housing 45 in the axial rotation direction of the central axis AX. According to this structure, since the rotation of the cylindrical member 46 in the axial rotation direction of the central axis AX is suppressed, the occurrence of damage to the solenoid device 41, such as the magnetic core 43, can be suppressed more reliably.

[0056] In the solenoid device 41 of this embodiment, the cylindrical member 46 has a connecting portion 46c on one end in the axial direction, which connects to the external fuel discharge flow path 50. According to this structure, since a contact portion with the valve unit 42 and a connector portion with the fuel discharge flow path 50 are provided on the cylindrical member 46 of a single component, the number of components can be reduced.

[0057] The solenoid valve 40 of the fuel injection device 10 in this embodiment includes the solenoid device 41 and the valve unit 42 described above. The valve unit 42 is formed using a magnetic material and is disposed opposite to the end on the other side of the magnetic core 43 in the axial direction. An elastic force is applied in a direction away from the magnetic core 43 in the axial direction. When no electromagnetic force is generated in the solenoid device 41, it is in a closed state by pressing the fuel flow path with the elastic force. When an electromagnetic force is generated in the solenoid device 41, it is attracted to the magnetic core 43 by the electromagnetic force until it is in contact with the cylindrical member 46 and moves away from the flow path, thereby opening the flow path.

[0058] Based on this structure, a solenoid valve 40 with high impact resistance can be obtained because it can suppress the occurrence of damage to the internal structure.

[0059] In the solenoid valve 40 of the fuel injection device 10 of this embodiment, the cylindrical member 46 has a support portion 46d that supports the elastic member 48 that applies an elastic force to the valve unit 42. According to this structure, since the cylindrical member 46 of a single component has a contact portion with the valve unit 42 and a support portion 46d for the elastic member 48, the number of components can be reduced.

[0060] The scope of this invention is not limited to the embodiments described above, and appropriate modifications can be made without departing from the spirit of the invention. For example, in the above embodiments, the structure of the solenoid valve 40 disposed in the fuel injection valve 13 of the fuel injection device 10 is given as an example for description, but it is not limited thereto. The solenoid valve 40 may also be disposed in other parts of the fuel injection device 10.

[0061] Furthermore, the configuration of the fuel injection device 10 or the fuel pump 11 is not limited to the embodiments described above. For example, the number of common rail 12 or fuel injection valves 13, the connection position of the fuel pump 11, etc., can be appropriately set.

[0062] Explanation of reference numerals in the attached figures

[0063] 10: Fuel injection device; 11: Fuel pump; 12: Common rail; 13: Fuel injection valve; 14: Fuel tank; 20: Injection section; 21, 45: Housing; 22: Piston valve; 22a: Spring seat assembly; 22b: Control side piston assembly; 22c: Connecting assembly; 22d, 42b: Valve core; 23, 48: Elastic component; 24: Fuel inlet; 25: Injection side flow path; 26: Control side flow path; 27: Injection side pressure chamber; 28: Control side pressure chamber; 29: Cylinder chamber; 30: Fuel injection port; 31: Fuel outlet; 32: Solenoid valve side pressure chamber; 40: Solenoid valve; 41: Solenoid assembly; 42 42a: Valve unit; 42c, 45d: Section; 43: Magnetic core; 43a: Cylindrical part; 43b: Flange part; 43c: Side part; 44: Coil; 44a: Terminal; 45a: Magnetic core housing part; 45b: Holding part; 46b: End face; 46: Cylindrical component; 46a: Protrusion; 46c: Connecting part; 46d: Support part; 46e, 46f: Spatial part; 46g: Connecting flow path; 46h: Locking part; 47: Terminal fixing component; 49: Sealing part; 50: Fuel discharge flow path; AX: Central shaft; L11: Fuel line; L12: Fuel high-voltage line; L13: Fuel supply line.

Claims

1. A solenoid device that drives a valve unit of a solenoid valve installed in a fuel injection device by electromagnetic force, wherein, The solenoid device includes: A cylindrical magnetic core; A coil wound around the magnetic core; A housing that houses the magnetic core and the coil, and at least covers one end of the magnetic core in the axial direction of its central axis; A terminal fixing component is disposed between the magnetic core and the housing in the axial direction and fixes the terminal connected to the coil. A cylindrical component is disposed on the inner circumference of the magnetic core, extending through the magnetic core and the housing along the axial direction. It has a protrusion that projects radially orthogonal to the axial direction and is held from both sides of the axial direction by the housing and the terminal fixing component. An end disposed on the other side of the axial direction is positioned to contact the valve unit. The end face of the cylindrical component on the other side of the axial direction is coplanar with the end face of the magnetic core on the other side of the axial direction, or is positioned at a point where it protrudes from the end face of the magnetic core on the other side of the axial direction.

2. The solenoid device according to claim 1, wherein, The protrusion has a locking portion that engages with the housing in the axial rotation direction of the central axis.

3. The solenoid device according to claim 1 or 2, wherein, The cylindrical component has a connection portion at one end on one side of the axial direction that connects to an external fuel discharge path.

4. A solenoid valve for a fuel injection device, comprising the solenoid device according to any one of claims 1 to 3, wherein, The solenoid valve of the fuel injection device also includes a valve unit formed using a magnetic material, which is disposed opposite to the end of the magnetic core on the other side of the axial direction. An elastic force is applied in a direction away from the magnetic core along the axial direction. When no electromagnetic force is generated in the solenoid device, it is in a closed state by pressing the fuel flow path by the elastic force. When an electromagnetic force is generated in the solenoid device, it is attracted to the magnetic core by the electromagnetic force until it contacts the cylindrical component and moves away from the flow path, thereby opening the flow path.

5. The solenoid valve of the fuel injection device according to claim 4, wherein, The cylindrical component has a support portion that supports an elastic component that applies the elastic force to the valve unit.

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