Fluid injection device

Abstract

Fluid injection device comprising: an injector (30, 70, 80, 90) containing: a nozzle portion (36) configured to inject fluid; a coil (40) configured to generate a driving force to drive the nozzle portion to open and close the nozzle portion; and a molding resin (46, 72, 82, 92) sealing the coil; a cooling jacket (20, 60, 100) having a flow path (200) arranged to cause a cooling fluid to flow therethrough, which houses the injector and which has an opening at one end opposite the nozzle portion; and a sealing material (50) filled into a space between the cooling jacket and the molding resin.

Description

CROSS-REFERENCE TO RELATED APPLICATION TECHNICAL FIELD

[0001] The present disclosure relates to a technique for housing an injector in a cooling jacket and cooling the injector with cooling fluid flowing through the cooling jacket. BACKGROUND

[0002] There is a known technique in which an injector used in a high-temperature environment is housed in a cooling jacket, and the injector is cooled by a cooling fluid flowing through the cooling jacket. For example, Patent Literature 1 discloses a technique related to a fluid injection device for injecting a reducing agent from an injector into an exhaust pipe of an engine. In the technique disclosed in Patent Literature 1, the fluid injection device includes the injector and a housing. The housing houses the injector and also serves as a cooling jacket through which a cooling fluid can flow to cool the injector.

[0003] The housing includes: a cup-shaped main body housing the injector; a cover that closes an opening of the main body to prevent foreign matter from entering the interior of the main body; and an inner casing that allows the flow of a cooling fluid. The cover further supports a pipe for supplying a reducing agent to the injector and a socket for removing a wiring harness that is to be electrically connected to an electrical terminal of the injector. Patent literature

[0004] Patent literature 1: Publication of the German patent application DE 10 2015 221 620 A1

[0005] DE 10 2010 004 397 A1 discloses a fuel injector for a common rail fuel system, including a common rail inlet port fluidly connected to a common high-pressure fuel rail, and a coolant inlet fluidly connected to an output from a low-pressure fuel feed pump. Cooling fluid flows internally through the fuel injector to cool a single-pole solenoid via both an internal and a peripheral coolant passage. To achieve a small spatial envelope while providing excellent performance, a thin insulating layer may separate the solenoid winding from an internal pole piece, and small flux gap clearances may cause a flux guide portion of the injector body to be part of the single-pole solenoid assembly.

[0006] US 2008 / 0 036 564 A1 discloses a method and apparatus for overmolding a plastic cover onto a coil former, comprising the step of providing a boss ring on the surface of the coil former, surrounding each spacer between the coil former and a mold wall and extending outwardly from the surface of the coil former. A variety of spacers and boss rings are currently preferred. The boss rings are small relative to the spacers, have a low thermal mass, and are therefore easily melted by the injected molten plastic, resulting in a seam between the coil material and the overmolding material. This seam creates a highly effective hermetic seal against moisture leakage along the surface of the coil former, away from the standoff location.Perfect melting of the spacers is no longer required, and the spacers can be designed to ensure correct positioning of the coil throughout the overmolding process.

[0007] DE 103 15 497 A1 discloses a low-cost and compact fuel injector that requires a minimal number of man-hours to manufacture and that allows for the repair of a material defect or a small hole in an insulation layer. The fuel injector comprises an electromagnetic coil that uses an insulated coil wire covered with an insulation layer and a fusion layer with self-fusing properties, with which the insulation layer is coated. Therefore, it is possible to dispense with the use of a coil former, and it is therefore possible to create a low-cost and compact fuel injector that requires a reduced number of man-hours to manufacture.Furthermore, a material defect or a small hole in the insulation layer is repaired by self-welding, thus improving the insulation properties and water resistance. Accordingly, it is possible to prevent coil breakage due to electrochemical corrosion. SUMMARY

[0008] It is noted that, as a result of detailed studies, the inventor discovered a problem with the technique disclosed in Patent Document 1: the number of components of a fluid injection device increases to fulfill various functions, such as closing the opening of the housing, supporting the bushing and tube, allowing the wire harness to be withdrawn from the injector, and allowing a cooling fluid to flow therethrough. As the number of components increases, a problem arises that the fluid injection device becomes large.

[0009] The object of the present disclosure is to provide a fluid injection device that includes a cooling jacket for cooling its injector and that enables its structure to be downsized.

[0010] According to one aspect of the present disclosure, a fluid injection device comprises an injector including: a nozzle portion configured to inject fluid; a coil configured to drive the nozzle portion to open and close the nozzle portion; and a molding resin that seals the coil.

[0011] The fluid injection device further includes a cooling jacket having a flow path configured to allow a cooling fluid to flow therethrough, housing the injector, and having an opening at one end opposite the nozzle portion. The fluid injection device further includes a sealing material filled in a space between the cooling jacket and the molding resin.

[0012] According to this design, the injector is supported by the sealing material filled in the space between the cooling jacket and the molding resin. Furthermore, even in a design where the opening at the end of the cooling jacket opposite the nozzle is open rather than closed with a cover, the injector components encapsulated with the sealing material can be protected from exposure to the environment at the opening side of the cooling jacket.

[0013] In this way, the sealing element performs various functions required for the fluid injection device. Therefore, the number of components of the fluid injection device can be reduced as much as possible. This design thus enables a downsizing of the fluid injection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objects, features, and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings: Fig. 1 is a cross-sectional view showing a fluid injection device according to a first embodiment; Fig. 2 is a sectional view along a line II-II in Fig. 1; Fig. 3 is a sectional view taken along a line III-III in Fig. 1; Fig. 4 is a sectional view showing a fluid injection device according to a second embodiment; Fig. 5 is a sectional view along a line VV in Fig. 4; Fig. 6 is a sectional view showing a fluid injection device according to a third embodiment; Fig. 7 is a sectional view along a line VII-VII of Fig. 6; Fig. 8 is a sectional view showing a fluid injection device according to a fourth embodiment; Fig. 9 is a sectional view along a line IX-IX in Fig. 8; and Fig. 10 is a sectional view showing a fluid injection device according to a fifth embodiment. DETAILED DESCRIPTION

[0015] Embodiments of the present disclosure will now be described with reference to the drawings. [1. First embodiment][1-1. Structure]

[0016] One in Fig. The fluid injection device 2 shown in Figure 1 includes a cooling jacket 20, an injector 30, and a sealing material 50. The fluid injection device 2 is installed, for example, upstream of an SCR catalyst in an exhaust pipe of an internal combustion engine to inject ammonia as a reducing agent into an exhaust passage upstream of the SCR catalyst. SCR is an abbreviation for Selective Catalytic Reduction.

[0017] The cooling jacket 20 includes a tubular outer jacket 22 and a tubular inner jacket 24 that is smaller in diameter than the outer jacket 22. A space between the outer jacket 22 and the inner jacket 24 forms a flow path 200 that is annular in cross-section to cause cooling water to flow therethrough as the cooling fluid.

[0018] The outer shell 22 has a cooling water inlet 202 and a cooling water outlet 204. The cooling water inlet 202 is formed on one end side of the outer shell 22 in the axial direction, which is located on the side of a nozzle portion 36 of the injector 30. The cooling water outlet 204 is formed on the other end side of the outer shell 22 opposite the nozzle portion 36. The cooling jacket 20 has an opening at the end opposite the nozzle portion 36 of the injector 30.

[0019] Cooling water supplied to the cooling water inlet 202 is supplied through the flow path 200 and discharged at the cooling water outlet 204. The injector 30, which is located on the radial inside of the inner shell 24, is cooled by the cooling water flowing through the flow path 200.

[0020] The injector 30 includes a valve body 32, the nozzle portion 36, a coil 40, wiring harnesses 42, which will be described later, and a molding resin 46. One end of the valve body 32 has an inlet port 34 to which urea water is supplied. The other end of the valve body 32 is provided with an injection hole plate 38 of the nozzle portion 36 by welding or the like.

[0021] The injection hole plate 38 has an injection hole for injecting urea water flowing from the inlet port 34. A nozzle needle (not shown) of the nozzle section 36 reciprocates to open and close the nozzle holes of the injection hole plate 38.

[0022] The coil 40 is an electromagnetic drive unit that generates a driving force to drive the nozzle needle to reciprocate and thereby open and close the nozzle holes. Fig. 2 and Fig. The wire harnesses 42 shown in Figure 3 are intended to supply electrical energy to the coil 40. The two wire harnesses 42 are supported by a support member 44 and removed from the molded resin 46. Note that the wire harnesses 42 in the sectional view of Fig. 1 are not shown.

[0023] The mold resin 46 covers the periphery of the coil 40 to seal the coil 40 and fix the coil 40. As shown in Fig. 1 to 3, the outer peripheral surface of the molded resin 46 has a flat portion 48 partially in the circumferential direction. The flat portion 48 is recessed from the periphery to the axial center and extends in the axial direction. The flat portion 48 can be formed outside an angular range θ in the circumferential direction around a central axis 300 of the injection valve 30 in the circumferential direction to contain the two wire harnesses 42. The angular range θ is, for example, 25°. In the first embodiment, the flat portion 48 is formed on the opposite side in the radial direction of the two wire harnesses 42.

[0024] The sealing material 50 is filled through an opening of the cooling jacket 20 into a space between the inner shell 24 and the molding resin 46. The opening of the cooling jacket 20 is formed at the end of the cooling jacket 20 opposite the nozzle portion 36 of the injector 30. The sealing material 50 covers the molding resin 46 and supports the injector 30. As described above, the opening is open at the end of the cooling jacket 20 opposite the nozzle portion 36 of the injector 30. Therefore, the sealing material 50 is exposed to the atmosphere on the side of the opening of the cooling jacket 20.

[0025] The sealing material 50 is a compound formed by mixing metal powder or metal oxide powder with high thermal conductivity with a resin material exhibiting thermosetting properties and flexibility. The resin exhibiting thermosetting properties and flexibility is, for example, urethane resin, silicone resin, epoxy resin, or the like. The metal powder or metal oxide powder exhibiting high thermal conductivity is, for example, aluminum oxide.

[0026] The sealing material 50 is filled into the space at a position above the space between the flat portion 48 and the inner shell 24. As described above, the flat portion 48 is recessed toward the center in the circumferential direction relative to the remaining portion of the molding resin 46. Therefore, the distance between the flat portion 48 and the inner peripheral surface of the inner shell 24 in the radial direction is larger than the distance in the circumferential direction between the outer peripheral surface of the remaining portion of the molding resin 46, other than the flat portion 48, and the inner peripheral surface of the inner shell 24.

[0027] That is, the space between the flat portion 48 and the inner shell 24 forms an enlarged portion 210 in which the radial distance is greater than the radial distance in the other space. Therefore, the flow path resistance, which is a resistance to fluid flow, in the space between the flat portion 48 and the inner shell 24 is smaller than the flow path resistance in the space between the outer peripheral surface of the remaining portion of the molding resin 46 other than the flat portion 48 and the inner shell 24.

[0028] A fluid flows more easily in a space where the flow path resistance is small compared to a space where the flow path resistance is large. Therefore, the sealing material 50 filled from the filling position above the enlarged portion 210 directly reaches the bottom of the space between the flat portion 48 and the inner shell 24 below the filling position faster than it reaches the space on the radially opposite side of the filling position after flowing along the circumferential direction. Subsequently, the sealing material 50 that has flowed into the space between the flat portion 48 and the inner shell 24 continues to flow into the remaining space in the circumferential direction and from below upward. [1-2. Effect]

[0029] The first embodiment described above has the following effects.

[0030] (1a) The flow path resistance in the space between the flat portion 48 and the inner shell 24 is smaller than the flow path resistance in the other remaining space. Therefore, the sealing material 50 reaches the lower portion faster than the other remaining space without trapping air bubbles in the space between the flat portion 48 and the inner shell 24.

[0031] The sealing material 50 flowing into the space between the flat portion 48 and the inner shell 24 flows from the bottom upward to force air into the remaining space before the sealing material 50 flowing in the circumferential direction encapsulates the upper portion of the remaining space. In this way, the sealing material 50 excludes air from the space between the molding resin 46 and the inner shell 24, making it possible to limit the inclusion of air bubbles in the sealing material 50 being filled.

[0032] (1b) The sealing material 50 filled in the space between the cooling jacket 20 and the molding resin 46 supports the injector 30. In addition, the sealing material 50 covers at least the molding resin 46. Therefore, even in the structure in which the opening at the end of the cooling jacket 20 on the side opposite to the nozzle portion 36 is open, the sealing material 50 enables the injector 30 embedded in the sealing material 50 to be protected from being exposed to the outside on the side of the opening of the cooling jacket 20.

[0033] As described above, the sealing material 50 provides various functions required for the fluid injection device 2. Therefore, the number of components of the fluid injection device 2 can be reduced as much as possible. This structure enables downsizing of the fluid injection device 2.

[0034] (1c) The resin material of the sealing material 50 has a thermosetting property and flexibility. Therefore, even if the sealing material 50 repeatedly expands and contracts due to changes in ambient temperature, the sealing material 50 can adapt to the expansion and contraction without causing damage such as cracks, while maintaining its hardness in a high-temperature environment.

[0035] (1d) The resin material of the sealing material 50 is mixed with metal powder or metal oxide powder, which has high thermal conductivity. Therefore, the injector 30 can be efficiently cooled by the cooling water flowing through the cooling jacket 20. [2. Second Embodiment][2-1. Difference from the First Embodiment]

[0036] The basic structure of the second embodiment is similar to that of the first embodiment. Therefore, the difference between them will be described below. The same reference numerals as in the first embodiment denote the same components, and reference is made to the previous description.

[0037] In the fluid injection device 2 of the first embodiment described above, the flat portion 48 is formed in the portion of the molding resin 46 in the circumferential direction. Thus, the first embodiment makes it possible to reduce the flow path resistance in the space between the flat portion 48 and the inner shell 24 compared to the flow path resistance in the other remaining space. The first embodiment thus increases the difference in flow path resistance in the space filled with the sealing material 50.

[0038] In contrast, in a fluid injection device 4 after the second in Fig. 4 and Fig. 5, an inner shell 62 of a cooling jacket 60 has a recessed portion 64 partially in the circumferential direction. The inner peripheral surface of the inner shell 62 is dented outward in the recessed portion 64 in the radial direction. In an injector 70 of the second embodiment, the outer diameter of a molding resin 72 is constant. It should be noted that in Fig. 15 the illustration of the cable harnesses 42 is omitted.

[0039] The second embodiment differs from the first embodiment in this structure in that the distance in the radial direction between the recess portion 64 of the inner shell 62 and the molding resin 72 in a predetermined range in the circumferential direction is larger than the distance in the radial direction between the portion of the inner shell 62 other than the recess portion 64 and the molding resin 72 in a predetermined range in the circumferential direction.

[0040] In the second embodiment, the enlarged portion 210 is formed in which the distance in the radial direction between the recess portion 64 of the inner shell 62 and the molding resin 72 in the predetermined range in the circumferential direction is larger than the distance in the radial direction between the portion of the inner shell 62 other than the recess portion 64 and the molding resin 72 in the predetermined range in the circumferential direction.

[0041] In this structure of the second embodiment, the flow path resistance in the space between the recess portion 64 and the molding resin 72 is smaller than the flow path resistance in the space between the portion of the inner shell 62 other than the recess portion 64 and the molding resin 72. [2-2. Effects]

[0042] The second embodiment described above produces the following effects in addition to the effects (1b) to (1d) of the first embodiment described above.

[0043] (2a) The flow path resistance in the space between the recess portion 64 and the molding resin 72 is smaller than the flow path resistance in the space formed between the portion of the inner shell 62 other than the recess portion 64 and the molding resin 72. Therefore, the space between the recess portion 64 and the molding resin 72 is filled with the sealing material 50 to the bottom faster than the other space, without trapping air bubbles therein.

[0044] The sealing material 50, which has flowed into the space between the recess portion 64 and the molding resin 72, flows upward from the bottom to push the air in the other space upward, before the upper portion of the other space is encapsulated with the sealing material 50 flowing in the circumferential direction. In this way, the sealing material 50 excludes air from the space between the molding resin 46 and the inner shell 62, making it possible to limit the inclusion of air bubbles in the sealing material 50 being filled. [3. Third Embodiment][3-1. Difference from the Second Embodiment]

[0045] The basic structure of the third embodiment is similar to that of the second embodiment. Therefore, the difference between them will be described below. The same reference numerals as in the first and second embodiments denote the same components, and reference is made to the previous description.

[0046] In the fluid injection device 4 of the second embodiment described above, the recess portion 64 is formed in the portion of the inner shell 62 of the cooling jacket 60 in which the inner peripheral surface is dented outward in the radial direction within the predetermined range in the circumferential direction. Thus, the second embodiment reduces the flow path resistance in the space between the recess portion 64 and the molding resin 72 compared to the flow path resistance in the space between the portion of the inner shell 62 other than the recess portion 64 and the molding resin 72.

[0047] In contrast, in a fluid injection device 6 of the third in Fig. 6 and Fig. In the embodiment shown in Figure 7, a resistance adjusting element 84 having a C-shaped cross section is elastically attached to the inner peripheral surface of the inner shell 24. The resistance adjusting element 84 can be formed of metal or resin. The resistance adjusting element 84 is a part of the inner shell 24 and forms an inner peripheral surface of the inner shell 24. The outer diameter of a molded resin 82 of an injector 80 is constant. Fig. 7 the representation of the cable harnesses 42 is omitted.

[0048] In this structure of the third embodiment, the space between the portion of the inner shell 24 where the resistance adjusting element 84 is not located and the molding resin 82 is larger than the space between the resistance adjusting element 84 and the molding resin 82. The third embodiment differs from the second embodiment in this structure in that the flow path resistance in the space between the portion of the inner shell 24 where the resistance adjusting element 84 is not located and the molding resin 82 is smaller than the flow path resistance in the space between the resistance adjusting element 84 and the molding resin 82.

[0049] The third embodiment forms the enlarged portion 210 in which the space between the portion of the inner shell 24 in which the resistance adjusting element 84 is not located and the molding resin 82 is larger than the space between the resistance adjusting element 84 and the molding resin 82. [3-2. Effect]

[0050] The third embodiment described above produces the following effects in addition to the effects (1b) to (1d) of the first embodiment described above.

[0051] (3a) The flow path resistance in the space between the portion of the inner shell 24 in which the resistance adjusting element 84 does not appear and the molding resin 82 is smaller than the flow path resistance in the space between the resistance adjusting element 84 and the molding resin 82. Therefore, the space between the portion of the inner shell 24 in which the resistance adjusting element 84 does not appear and the molding resin 82 is filled with the sealing material 50 to the bottom faster than the other remaining space without trapping air bubbles therein.

[0052] The sealing material 50 that has flowed into the space between the portion of the inner shell 24 where the resistance adjusting element 84 is not formed and the molding resin 82 flows from the bottom to the top to push air in the remaining space upward, before encapsulating the upper portion of the remaining space with the sealing material 50 flowing in the circumferential direction. In this way, air is extruded from the space between the molding resin 82 and the inner shell 24 and from the space between the molding resin 82 and the resistance adjusting element 84, preventing air bubbles from being trapped in the sealing material 50 being filled. [4. Fourth Embodiment][4-1. Difference from the First Embodiment]

[0053] The basic structure of the fourth embodiment is similar to that of the first embodiment. Therefore, the difference between them will be described below. The same reference numerals as in the first embodiment denote the same components, and reference is made to the previous description.

[0054] The fluid injection device 2 of the first embodiment described above increases the difference in flow path resistance in the space between the molding resin 46 and the inner shell 24, whereby the sealing material 50 can be filled more quickly to the bottom of the space where the flow path resistance is smaller than in the other remaining space.

[0055] In contrast, in a fluid injection device 8 of the fourth in Fig. 8 and Fig. 9, the outer diameter of a molding resin 92 of an injector 90 is constant. Therefore, the fourth embodiment differs from the first embodiment in that the flow path resistance of the space between the molding resin 92 and the inner shell 24 is constant. Fig. 7 the representation of the cable harnesses 42 is omitted.

[0056] Note that in the fourth embodiment, a through-hole 94 is formed at at least one position in the circumferential direction of the molding resin 92, penetrating the molding resin 92 in the axial direction. At the circumferential position where the through-hole 94 is formed, the sealing material 50 flows through the through-hole 94 into the bottom of the inner shell 24 in addition to the space between the molding resin 92 and the inner shell 24.

[0057] Therefore, at the circumferential position where the through hole 94 is formed, the sealing material 50 flows faster to the bottom of the inner shell 24 than at the other remaining circumferential positions. [4-2. Effect]

[0058] The fourth embodiment described above produces the following effects in addition to the effects (1b) to (1d) of the first embodiment described above.

[0059] (4a) At the circumferential position where the through-hole 94 is formed, the sealing material 50 flows into the bottom of the inner shell 24 faster than at the other remaining circumferential positions, and therefore the bottom is filled with the sealing material 50 without enclosing and sealing air bubbles.

[0060] The sealing material 50, which has flowed to the bottom at the circumferential position where the through-hole 94 is formed, flows upward from the bottom to push air in the remaining space upward, before the upper portion in the remaining space is encapsulated with the sealing material 50 flowing in the circumferential direction. In this way, the sealing material 50 excludes air from the space between the molding resin 92 and the inner shell 24, making it possible to limit the entrapment of air bubbles in the filled sealing material 50. [5. Fifth Embodiment]

[0061] [5-1. Difference from the Fourth Embodiment] The basic structure of the fifth embodiment is similar to that of the fourth embodiment. Therefore, the difference between them will be described below. The same reference numerals as in the fourth embodiment denote the same components, and reference is made to the previous description.

[0062] A fluid injection device 10 according to the Fig. The fifth embodiment shown in Fig. 10 is identical to the fluid injection device 8 of the fourth embodiment in that the through hole 94 penetrating the molding resin 92 in the axial direction is formed at least at one position in the circumferential direction of the molding resin 92 of the injector 90.

[0063] In the fifth embodiment, a cooling jacket 100 further includes a connecting pipe 102 at the same circumferential position as the through hole 94. The connecting pipe 102 connects the outer shell 22 to the inner shell 24. The connecting pipe 102 forms a connecting flow path 104 at a position corresponding to the bottom of the space between the molding resin 92 and the inner shell 24. The connecting flow path 104 forms the connecting flow path 104 connecting the space on the radially inner side of the inner shell 24 to the space on the radially outer side of the outer shell 22. More specifically, the connecting flow path 104 can be formed at the position corresponding to the filling position in the circumferential direction and / or the radial direction.

[0064] This structure allows air forced by the sealing material 50 flowing through the through hole 94 into the bottom of the inner shell 24 to be discharged through the connecting pipe 102 to the outside of the outer shell 22. [5-2. Effect]

[0065] The fifth embodiment described above makes it possible to achieve the following effects in addition to the effects (1b) to (1d) of the first embodiment and the effect (4a) of the fourth embodiment.

[0066] (5a) The air forced by the sealing material 50, which flows into the bottom of the inner shell 24 through the through-hole 94, is discharged to the outside of the outer shell 22 through the connecting pipe 102, so that the air is discharged to the outside of the inner shell 24. Thus, this structure allows the sealing material 50 to be filled into the bottom of the inner shell 24 without trapping air bubbles. [6. Other embodiments]

[0067] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various changes may be made to implement the present disclosure.

[0068] (6a) In the above embodiment, the device that injects urea water into the exhaust passage of the internal combustion engine at the position upstream of the SCR catalyst was described as a fluid injection device that cools the injector with the cooling water flowing through the cooling jacket. The fluid sprayed by the injector is not limited to urea water. For example, the injector may inject fuel into an exhaust passage upstream of a DOC. DOC is an abbreviation for a diesel oxygen catalyst.

[0069] (6b) The fluid injection device is not limited to use in an internal combustion engine and can be used in various fields as long as the fluid injection device is used in a high-temperature environment to cool an injector with a cooling fluid flowing through a cooling jacket.

[0070] (6c) The first embodiment and the second embodiment may be combined. Specifically, the recess portion 64 may be formed in the inner shell 62 in the circumferential direction in the predetermined area facing the flat portion 48 of the molding resin 46.

[0071] (6d) In the first embodiment, the inner shell 24 and the outer shell 22 can be connected at the lower end of the enlarged portion 210 via the connecting pipe 102 described in the fourth embodiment.

[0072] (6e) In a structure in which the end of the cooling jacket opposite the nozzle is open, and in which the sealing material 50 filled into the radially inner side of the cooling jacket, which is exposed to the space on the opening side of the cooling jacket, covers the outer periphery of the molding resin, the radial distance between the molding resin and the inner sleeve can be constant over the entire circumferential direction. Furthermore, the through hole for flowing the sealing material does not need to be formed in the molding resin.

[0073] (6f) The cooling fluid flowing through the flow path of the cooling jacket may be a fluid other than water. For example, the cooling fluid may be air.

[0074] (6g) The multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by the multiple components. Multiple functions of multiple elements may be realized by one element, or a function realized by multiple elements may be realized by one element. Moreover, part of the configuration of the above-described embodiment may be omitted. At least part of the configuration of the above-described embodiment may be added to or replaced by another configuration of the above-described embodiment.

[0075] The wiring harnesses 42 may be one, three or more.

[0076] It should be noted that while the processes of embodiments of the present disclosure have been described herein as a particular sequence of steps, other alternative embodiments, including various other sequences of these steps and / or additional steps not disclosed herein, are intended to be within the steps of the present disclosure.

[0077] While the present disclosure has been described with reference to its preferred embodiments, it should be understood that the disclosure is not limited to the preferred embodiments and constructions. The present disclosure is intended to cover various modifications and equivalent embodiments. Furthermore, while the various combinations and configurations that are preferred are described herein, other combinations and configurations that include more, fewer, or only a single element are also intended to be within the spirit and scope of the present disclosure.

Claims

[1] Fluid injection device, comprising: an injector (30, 70, 80, 90) containing: a nozzle portion (36) configured to inject fluid; a coil (40) configured to generate a driving force to drive the nozzle portion to open and close the nozzle portion; and a molding resin (46, 72, 82, 92) sealing the coil; a cooling jacket (20, 60, 100) having a flow path (200) arranged to cause a cooling fluid to flow therethrough, which houses the injector and which has an opening at one end opposite the nozzle portion; and a sealing material (50) filled into a space between the cooling jacket and the molding resin. [2] Fluid injection device according to claim 1, wherein the space between the cooling jacket and the molding resin, and in which the sealing material is filled, has an enlarged portion (210) partially in the circumferential direction, and a distance between the cooling jacket and the molding resin in the enlarged portion (210) is larger than in a portion other than the enlarged portion. [3] Fluid injection device according to claim 2, further comprising: a wiring harness (42) electrically connected to the coil, wherein the enlarged portion is formed outside an angular range of 25° around a central axis (300) of the injector in the circumferential direction, and the cable harness (42) is in the angle range. [4] The fluid injection device according to any one of claims 1 to 3, wherein the sealing material is formed of a resin material mixed with a material whose thermal conductivity is higher than that of the resin material. [5] Fluid injection device according to one of claims 1 to 4, wherein the sealing material is made of a resin material and the resin material has a thermosetting property and flexibility. [6] A fluid injection device according to any one of claims 1 to 5, wherein the molding resin (92) has a through hole (94) extending through the molding resin in an axial direction. [7] A fluid injection device according to any one of claims 1 to 6, wherein the cooling jacket (100) has a communication flow path (104) at a position corresponding to a bottom of the space between the cooling jacket and the molding resin, and the connecting flow path connects a radial inner side of the cooling jacket with a radial outer side of the cooling jacket.

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