JP6044619B2 - Fuel injection device - Google Patents

Description

  The present invention relates to a fuel injection device that injects gaseous fuel into an intake pipe provided in an internal combustion engine.

  2. Description of the Related Art Conventionally, a fuel injection device is known that includes a supply main body that forms a fuel passage for supplying gaseous fuel to an injection hole, and a valve body that intermittently inflows the gaseous fuel into the injection hole by displacement relative to the supply main body. As a kind of such fuel injection device, for example, Patent Document 1 discloses an injection hole plate that forms an injection port in contact with a nozzle as a supply body, an insertion member that forms two holes that are continuous with the injection port, and a jet flow. A configuration comprising a distribution member is disclosed.

JP-A-8-42429

  Now, about the fuel injection apparatus which injects gaseous fuel, the inventors of this invention repeated research about the mixing improvement of gaseous fuel and air. As a result, in the configuration as disclosed in Patent Document 1, a contracted flow is generated in the jet of the gaseous fuel injected from the two holes connected to the injection port, and the mixed deterioration is caused by the contracted flow. The inventors of the present invention have found out.

  More specifically, the outer edge of the jet of gaseous fuel injected from the nozzle hole has a lower pressure than the surrounding air due to the high flow velocity. Therefore, it flows in so that surrounding air may be caught in the outer edge of a jet. Then, the gaseous fuel jet becomes a flow with a contracted flow that contracts as the distance from the nozzle hole increases. Thus, the gaseous fuel having a reduced contact area with air becomes difficult to mix with the surrounding air.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a fuel injection device capable of forming an air-fuel mixture suitable for combustion by suppressing deterioration of mixing of gaseous fuel and air. Is to provide.

In order to achieve the above object, one disclosed invention is a fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine, and an injection hole for injecting gaseous fuel (60a, 260 a) at least one formed injection hole forming member (60, 260, and 6 60, 1 16 0), the supply body to form a fuel passage for supplying gaseous fuel to the injection hole (10), the supply body Is provided between the valve body (40) for interrupting the inflow of gaseous fuel into the nozzle hole and the connection between the supply body and the intake pipe, or between the supply body and the intake pipe. It is located at the connecting portion between the extension member (90) for extending the passage and the intake pipe, and the mixing of the gaseous fuel and air caused by the contracted flow accompanying the jet itself is deteriorated in the jet of the gaseous fuel injected from the nozzle hole. suppressing suppressing structure (70, 6 7 Comprises 1 17 0), the suppression structure is erected so as to surround the periphery of the injection hole, forming an air introducing hole for introducing air (71,1171A) inside of the jet which is injected from the injection hole A plurality of nozzle holes are formed in the nozzle hole forming member, and the opening (71o) on the air outlet side of the air inlet hole is a plurality of nozzle holes. a fuel injection device that is directed between the jets injected from the two adjacent.
Another disclosed invention is a fuel injection device that injects gaseous fuel into an intake pipe (2) provided in an internal combustion engine, and has at least one injection hole (60a) for injecting gaseous fuel. The formed nozzle hole forming member (360), the supply body (10) that forms a fuel passage for supplying gaseous fuel to the nozzle hole, and the displacement of the gas fuel to the nozzle hole by displacing with respect to the supply body Connection between the valve body (40) for interrupting the inflow and the connection portion between the supply body and the intake pipe, or an extension member (90) provided between the supply body and the intake pipe and extending the fuel passage, and the intake pipe And a suppression structure (370) that suppresses the deterioration of mixing of the gaseous fuel and the air caused by the contracted flow accompanying the jet itself with respect to the jet of the gaseous fuel that is located in the portion and is injected from the nozzle hole. 370) stands up to surround the nozzle hole A peripheral wall portion (362) that forms an air introduction hole (371) for introducing air into the jet flow ejected from the nozzle hole, and the nozzle hole forming member has a plurality of nozzle holes arranged in an annular shape. The peripheral wall portion is erected from the outer peripheral side of the plurality of injection holes in the injection hole forming member, and the air introduction hole is extended to the inner peripheral side, thereby opening the air introduction hole on the air introduction side ( 371o) is a fuel injection device that forms a guide (372) that is positioned between jets injected from two adjacent nozzle holes.
Another disclosed invention is a fuel injection device that injects gaseous fuel into an intake pipe (2) provided in an internal combustion engine, and has at least one injection hole (60a) for injecting gaseous fuel. The formed nozzle hole forming member (660), the supply body (10) that forms a fuel passage for supplying gaseous fuel to the nozzle hole, and the displacement of the gas fuel to the nozzle hole by being displaced with respect to the supply body Connection between the valve body (40) for interrupting the inflow and the connection portion between the supply body and the intake pipe, or an extension member (90) provided between the supply body and the intake pipe and extending the fuel passage, and the intake pipe And a suppression structure (670) that suppresses the deterioration of mixing of gaseous fuel and air caused by the contracted flow accompanying the jet itself with respect to the jet of the gaseous fuel that is located in the nozzle and is injected from the nozzle hole. Erected to surround the nozzle hole A peripheral wall portion (662) that forms an air introduction hole (671) for introducing air into the jet jetted from the air, and the peripheral wall portion has air up to an end surface (662a) in the standing direction in the peripheral wall portion. The fuel injection device is formed with an enlarged opening (674) for enlarging the introduction hole.

According to these inventions, mixed deterioration of gaseous fuel and air caused by the contraction flow is suppressed by suppressing structure located in the connection portion between the supply body and the intake pipe. Therefore, the gaseous fuel injected from the injection hole can be mixed properly with the air flowing through the intake pipe. According to the above, it is possible to form an air-fuel mixture suitable for combustion.

Added is come these inventions, since the outer edge of the jet which is injected from the injection hole is lower pressure than the ambient, air which has flowed through the air introduction hole of the peripheral wall portion which is erected around the injection hole, sucked into the jet And can be introduced into the jet. The air thus introduced into the jet acts so as to widen the jet, thus preventing a reduction in the contact area between the air and the jet. As described above, the suppression structure including the peripheral wall portion forming the air introduction hole can introduce air into the jet flow by using the pressure drop of the jet outer edge. Therefore, although the above-mentioned suppression structure is a simple structure, the suppression effect of the mixing deterioration of the gaseous fuel and air which arises by a contracted flow can be exhibited reliably.

Another disclosed invention is a fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine, and has at least one injection hole (460a) for injecting gaseous fuel. Two nozzle hole forming members (460, 560, 760), a supply body (10) that forms a fuel passage for supplying gaseous fuel to the nozzle holes, and displacement with respect to the supply body, into the nozzle holes A valve body (40) for intermittently inflow of gaseous fuel and a connecting portion between the supply body and the intake pipe, or an extension member (90) provided between the supply body and the intake pipe to extend the fuel passage and the intake air Suppressing structure (470, 570, 770) that suppresses deterioration of mixing of gaseous fuel and air caused by the contraction accompanying the jet itself with respect to the jet of gaseous fuel injected from the nozzle hole, located at the connection portion with the pipe and, equipped with suppression structure is A nozzle hole (460a) in which the central angle is extended in a ring so as to be 180 ° or more, a peripheral wall portion which is erected so as to surround the outer peripheral side of the injection hole and (460,562,762), a feature in that it comprises doing.

  Like this invention, the jet flow injected from the nozzle hole extended cyclically | annularly so that a center angle may be 180 degrees or more becomes a cylinder shape with which the circumferential direction part interrupted. The cylindrical jet flow is attracted to the peripheral wall portion located on the outer peripheral side of the nozzle hole, thereby maintaining the shape of the jet flow itself. Furthermore, ambient air is introduced into the inner peripheral side of the jet from a portion where the jet is interrupted. For this reason, the jet is spread to the outer peripheral side by the air introduced to the inner peripheral side, and a contact area with the air is ensured. Therefore, even with the suppression structure in which the annular injection hole and the peripheral wall portion are combined, it is possible to suppress the deterioration of mixing of the gaseous fuel and air caused by the contracted flow.

Another disclosed invention is a fuel injection device that injects gaseous fuel into an intake pipe (2) provided in an internal combustion engine, and has injection holes (60a, 1260a) for injecting gaseous fuel. At least one nozzle hole forming member (860, 960, 1060, 1160, 1360), a supply body (10) that forms a fuel passage for supplying gaseous fuel to the nozzle holes, and a displacement relative to the supply body Thus, the valve body (40) for intermittently injecting the gaseous fuel into the nozzle hole and the connection portion between the supply main body and the intake pipe or the extension provided between the supply main body and the intake pipe to extend the fuel passage Suppressing structure that suppresses the deterioration of mixing of gaseous fuel and air caused by the contracted flow accompanying the jet itself with respect to the jet of the gaseous fuel that is located at the connection portion between the member (90) and the intake pipe. 870,970 And 1070,1170,1370) comprises, on the nozzle hole forming member, is formed a plurality of injection holes arranged in annular (60a) is suppressed structure is the inner circumference of the plurality of injection holes in the injection hole forming member It is characterized by having an inner peripheral guide wall portion (875, 975, 1075, 1375) which is erected from the side and guides a jet flow injected from each nozzle hole.

  As in the present invention, the inner peripheral guide wall portion erected on the inner peripheral side of the plurality of annularly arranged nozzle holes can guide the direction of the jet flow by coming into contact with or attracting the jet flow. By suppressing the contraction flow by dispersing the jet flow by the guide action of the inner peripheral guide wall portion, the contact area between the jet flow and the air can be prevented from being reduced. Therefore, even with the suppression structure using the guide wall portion located on the inner peripheral side of each nozzle hole, it is possible to suppress the deterioration of mixing of gaseous fuel and air.

Further, another disclosed invention is a fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine, wherein at least one injection hole for injecting gaseous fuel is formed. The injection hole forming member (1260, 1360), the supply main body (10) that forms a fuel passage for supplying gaseous fuel to the injection hole, and the displacement of the supply fuel to the supply main body allows the gaseous fuel to flow into the injection hole. Between the supply body and the intake pipe, or the connection part between the extension member (90) provided between the supply body and the intake pipe and extending the fuel passage and the intake pipe And a suppression structure (1270, 1370) that suppresses the deterioration of the mixing of the gaseous fuel and the air caused by the contracted flow associated with the jet itself. Concrete, at the nozzle hole forming member within Extending from the first nozzle hole of the hole (1260a) on the outer peripheral side, the second injection hole (1277) that opens to the side surface (1264) of the injection hole forming member, and comprising a.

  In this invention, since the 2nd nozzle hole branched from the 1st nozzle hole is opened in the side surface of the nozzle hole formation member, a jet stream is inject | emitted not only from a 1st nozzle hole but from a 2nd nozzle hole. As described above, by increasing the number of jets to be formed, the contact area between the gaseous fuel and the air can be earned even if the individual jets are accompanied by contraction. As described above, even in the suppression structure using the configuration in which the nozzle hole is branched, the deterioration of the mixing of the gaseous fuel and the air is suppressed.

Furthermore, another disclosed invention is a fuel injection device that receives a control signal from a control unit (120) of an internal combustion engine and injects gaseous fuel into an intake pipe (2) provided in the internal combustion engine. A supply body (10) for forming a fuel passage for supplying gaseous fuel to the intake pipe, an extension member (90) provided between the supply body and the intake pipe for extending the fuel passage, and the supply body by displacement is interrupted the flow of gaseous fuel in the fuel passage, and Rubentai a controlled displacement by a control signal (40), located in the connecting portion between the extension member and the intake pipe, a gaseous fuel into the intake pipe An injection hole forming member (1460, 1560, 1660) in which at least one injection hole to be dispersed is formed, and when the internal combustion engine is in a transient operation state, the injection of gaseous fuel into the intake pipe Intake valve (6 A fuel injection device of Ru is completed before opening.
Another disclosed invention is a fuel injection device that receives a control signal from a control unit (120) of an internal combustion engine and injects gaseous fuel into an intake pipe (2) provided in the internal combustion engine. A supply body (10) for forming a fuel passage for supplying gaseous fuel to the intake pipe, an extension member (90) provided between the supply body and the intake pipe for extending the fuel passage, and the supply body Is located at the connecting portion between the valve body (40) whose displacement is controlled by the control signal and the extension member and the intake pipe, and the gaseous fuel is placed in the intake pipe. An injection hole forming member (1460, 1560, 1660) in which at least one injection hole for dispersing the gas is formed, and when the internal combustion engine is in a steady operation state, the injection of gaseous fuel into the intake pipe Intake valve (6 After the opening, and, the fuel injection device is completed before bottom dead center of the intake stroke.

As in these inventions, in the embodiment provided with an extension member between the supply body and the intake pipe, the weak timing the flow of air in the intake pipe it may become necessary to supply the gaseous fuel into an intake pipe. Even in such a case, if the injection hole forming member is positioned at the connection portion between the extension member and the intake pipe, the gaseous fuel that has passed through the injection hole is dispersed in the intake pipe, so But it can be mixed properly. As a result, it is possible to form an air-fuel mixture suitable for combustion.

  Note that the reference numbers in the parentheses are merely examples of correspondences with specific configurations in the embodiments to be described later in order to facilitate understanding of the present invention, and limit the scope of the present invention. It is not a thing.

It is sectional drawing which shows the fuel-injection apparatus by 1st embodiment of this invention. FIG. 4 is an enlarged view illustrating a suppression structure provided at a connection portion between the valve body and the intake pipe, and is a cross-sectional view taken along the line II-II in FIG. 3. It is a figure which shows the detail of the suppression structure seen in the direction of the arrow III shown in FIG. It is a figure which shows that the air-fuel | gaseous mixture in the combustion chamber was homogenized by the suppression structure. It is an enlarged view which shows the suppression structure by 2nd embodiment, Comprising: It is the VV sectional view taken on the line of FIG. It is a figure which shows the detail of the suppression structure seen in the direction of arrow VI shown in FIG. It is an enlarged view which shows the suppression structure by 3rd embodiment, Comprising: It is the VII-VII sectional view taken on the line of FIG. It is a figure which shows the detail of the suppression structure seen in the direction of arrow VIII shown in FIG. FIG. 11 is an enlarged view showing the suppression structure according to the fourth embodiment, and is a cross-sectional view taken along the line IX-IX in FIG. 10. It is a figure which shows the detail of the suppression structure seen in the direction of the arrow X shown in FIG. It is an enlarged view which shows the suppression structure by 5th embodiment, Comprising: It is the XI-XI sectional view taken on the line of FIG. It is a figure which shows the detail of the suppression structure seen in the direction of the arrow XII shown in FIG. It is an enlarged view which shows the suppression structure by 6th embodiment, Comprising: It is the XIII-XIII sectional view taken on the line of FIG. It is a figure which shows the detail of the suppression structure seen in the direction of arrow XIV shown in FIG. It is an enlarged view which shows the suppression structure by 7th embodiment, and is XV-XV sectional view taken on the line of FIG. It is a figure which shows the detail of the suppression structure seen in the direction of arrow XVI shown in FIG. It is an enlarged view which shows the suppression structure by 8th embodiment, Comprising: It is the XVII-XVII sectional view taken on the line of FIG. It is a figure which shows the detail of the suppression structure seen in the direction of arrow XVIII shown in FIG. It is an enlarged view which shows the suppression structure by 9th embodiment, and is XIX-XIX sectional view taken on the line of FIG. It is a figure which shows the detail of the suppression structure seen in the direction of arrow XX shown in FIG. FIG. 23 is an enlarged view showing the suppression structure according to the tenth embodiment, and is a cross-sectional view taken along line XXI-XXI in FIG. 22. It is a figure which shows the detail of the suppression structure seen in the direction of arrow XXII shown in FIG. FIG. 25 is an enlarged view showing the suppression structure according to the eleventh embodiment in an enlarged manner, and is a sectional view taken along line XXIII-XXIII in FIG. 24. It is a figure which shows the detail of the suppression structure seen in the direction of arrow XXIV shown in FIG. It is an enlarged view which shows the suppression structure by 12th embodiment, and is XXV-XXV sectional view taken on the line of FIG. It is a figure which shows the detail of the suppression structure seen in the direction of arrow XXVI shown in FIG. FIG. 29 is an enlarged view showing the suppression structure according to the thirteenth embodiment in an enlarged manner, and is a sectional view taken along line XXVII-XXVII in FIG. 28. It is a figure which shows the detail of the suppression structure seen in the direction of arrow XXVIII shown in FIG. It is a figure which shows the gaseous fuel injection system provided with the fuel-injection apparatus by 14th embodiment of this invention. It is a figure which shows the detail of the adapter arrange | positioned at the connection part of a fuel hose and an intake pipe. It is a figure which shows arrangement | positioning of the nozzle hole formed in the adapter shown in FIG. 30, Comprising: It is the bottom view which looked at the bottom part of the adapter in the direction of arrow XXXI of FIG. It is a figure which shows the injection timing of gaseous fuel in the transient driving | running state of an internal combustion engine. It is a figure which shows the injection timing of gaseous fuel in the steady operation state of an internal combustion engine. It is a figure which shows the detail of the adapter of 15th embodiment. It is a figure which shows arrangement | positioning of the nozzle hole formed in the adapter shown in FIG. It is a figure which shows the detail of the adapter of 16th embodiment. It is a figure which shows arrangement | positioning of the nozzle hole formed in the adapter shown in FIG.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. Moreover, not only the combination of the configurations explicitly described in the description of each embodiment, but also the configuration of a plurality of embodiments can be partially combined even if they are not explicitly described, as long as there is no problem in the combination. And the combination where the structure described in several embodiment and the modification is not specified shall also be disclosed by the following description.

(First embodiment)
A fuel injection device 100 shown in FIG. 1 is mounted on a vehicle and injects gaseous fuel (gas fuel) used for combustion of an internal combustion engine. Specific examples of the gaseous fuel include CNG (Compressed Natural Gas), LNG (Liquefied Natural Gas), hydrogen, and the like. Gaseous fuel is stored in a compressed state in a fuel tank (not shown) mounted on the vehicle. The gaseous fuel in the fuel tank is supplied to the fuel injection device 100 after the pressure is adjusted by a pressure regulating valve provided in the fuel regulator.

  The fuel injection device 100 is attached to the intake pipe 2 of the internal combustion engine. The intake pipe 2 forms an intake passage 2a that branches into a plurality of intake ports formed in one combustion chamber. The fuel injection device 100 is attached to the upstream side of the branch portion of the intake pipe 2. The gaseous fuel injected from the fuel injection device 100 into the intake passage 2a branches along the intake passage 2a while being mixed with intake air, and then flows into the combustion chamber (see FIG. 4) from each intake port.

  The fuel injection device 100 includes a valve body 10, a valve body 40, an injection hole body 60, and the like.

  The valve body 10 forms a fuel passage 15 for supplying gaseous fuel to the nozzle hole 60 a formed in the nozzle hole body 60. The valve body 10 includes a resin housing 11, a metal housing 12, a core housing 20, a drive unit 24, a fixed core 30, an adjustment member 31, and an elastic member 32.

  Both the resin housing 11 and the metal housing 12 are formed in a cylindrical shape. A core housing 20, a fixed core 30, a drive unit 24, a valve body 40, and the like are accommodated in the cylindrical inside of each housing 11, 12. In the metal housing 12, an O-ring 3 is attached to a tip portion connected to the intake pipe 2. The O-ring 3 ensures airtightness by sealing between the metal housing 12 and the intake pipe 2.

  The core housing 20 includes an upper magnetic body 21, a nonmagnetic body 22, and a lower magnetic body 23 each formed in a cylindrical shape. The upper magnetic body 21 and the lower magnetic body 23 formed of a magnetic material are disposed on both sides in the axial direction of the nonmagnetic body 22 formed of a nonmagnetic material. The nonmagnetic material 22 prevents a short circuit of magnetic flux between the magnetic materials 21 and 23. The upper magnetic body 21, the non-magnetic body 22, and the lower magnetic body 23 are arranged in this order in the axial direction, and are joined together to form a cylindrical core housing 20. A fuel passage 15 is formed on the inner peripheral side of the core housing 20.

  The drive unit 24 includes a coil 25, a resin bobbin 26, and a magnetic yoke 27. The coil 25 is formed by winding a metal wire around a resin bobbin 26. The coil 25 is located on the outer peripheral side of the upper magnetic body 21 and the nonmagnetic body 22. The coil 25 is electrically connected to an external control circuit, and energization is controlled by the control circuit. A magnetic yoke 27 formed of a magnetic material is disposed on the outer peripheral side of the coil 25.

  The fixed core 30 is formed in a cylindrical shape by a magnetic material. The fixed core 30 is fixed to the inner peripheral surfaces of the upper magnetic body 21 and the nonmagnetic body 22 and is positioned on the same axis. The fixed core 30 is provided with a through hole 30a that penetrates the central portion in the radial direction in the axial direction. A cylindrical adjustment member 31 is locked to the inner peripheral surface of the through hole 30a.

  The elastic member 32 is a metal compression coil spring. The elastic member 32 is accommodated in the spring accommodating chamber 41. The spring accommodating chamber 41 is a space formed by a through hole 30 a of the fixed core 30 and a through hole 42 (described later) provided in the valve body 40. The elastic member 32 is elastically deformed by being compressed in the axial direction by the adjusting member 31 and the valve body 40. The restoring force generated by elastic deformation of the elastic member 32 becomes a biasing force in a direction in which the valve body 40 is separated from the fixed core 30. The set load of the elastic member 32 is adjusted by the amount of press-fitting of the adjustment member 31 into the through hole 30a.

  The valve body 40 is displaced with respect to the valve body 10 to intermittently flow the gaseous fuel into the nozzle hole 60a. The valve body 40 includes a movable core 44 and a sealing material 50.

  The movable core 44 is formed in a cylindrical shape by a magnetic material. The movable core 44 is coaxially arranged on the inner peripheral side of the core housing 20 and faces the fixed core 30 on the fuel upstream side in the axial direction. The movable core 44 can be reciprocated in the axial direction by being guided by the inner peripheral surface of the lower magnetic body 23. A through hole 42 and a communication hole 43 are formed in the movable core 44. The through hole 42 penetrates the central portion in the radial direction of the movable core 44 in the axial direction, and forms a spring accommodating chamber 41 together with the through hole 30 a of the fixed core 30. The communication hole 43 penetrates the cylindrical wall portion of the movable core 44 in the radial direction, and communicates the inside and outside of the wall portion. On the outer peripheral side of the communication hole 43, a fuel reservoir chamber 23 a is defined by the outer peripheral surface of the movable core 44 and the inner peripheral surface of the lower magnetic body 23 that are opposed to each other in the radial direction.

  The sealing material 50 is formed in an annular shape by, for example, fluorine rubber that can be elastically deformed. A circular through hole 51 is opened in the radial center of the sealing material 50. The sealing material 50 is attached so that the opening of the through hole 42 and the through hole 51 overlap the end face located on the opposite side of the fixed core 30 among the both end faces of the movable core 44. The seal material 50 presses the seal surface 52 facing the nozzle hole body 60 around the nozzle hole 60a by the displacement of the movable core 44 in the direction away from the fixed core 30.

  The nozzle hole body 60 is formed in a bottomed cylindrical shape by pressing a single metal base material. The nozzle hole body 60 is attached to the end of the lower magnetic body 23 in the axial direction opposite to the nonmagnetic body 22. As shown in FIGS. 1 and 2, the nozzle hole body 60 is formed with a disk-shaped bottom wall portion 61 and a peripheral wall portion 62 erected in a cylindrical shape from the outer edge of the bottom wall portion 61. Yes.

  The bottom wall 61 is formed with a plurality of injection holes 60 a that penetrate the bottom wall 61 in the thickness direction and inject gaseous fuel into the intake pipe 2. As shown in FIGS. 1 and 3, each nozzle hole 60 a is an arcuate slit extending around a central axis C (see also FIG. 2) defined along the moving direction of the valve body 40. The nozzle holes 60a are aligned in the radial direction and are arranged at equal intervals in the circumferential direction. The outer surface 61b of the bottom wall portion 61 exposed to the outside has a flat shape extending perpendicularly to the central axis C. An outlet 60o of the nozzle hole 60a is opened on the outer surface 61b. On the other hand, as shown in FIGS. 1 and 2, the inner surface 61 a of the bottom wall portion 61 that faces the valve body 40 forms a lip portion 63 that protrudes toward the sealing material 50. The lip 63 extends so as to surround the inner peripheral side and the outer peripheral side of the nozzle hole 60a. The inflow port 60 i of the nozzle hole 60 a is open to a region surrounded by the lip part 63. The lip part 63 improves the sealing performance between the valve body 40 and the nozzle hole body 60 by increasing the surface pressure in the contact area with the seal surface 52. The peripheral wall 62 is located on the radially outer side of each nozzle hole 60a. A space is provided between the peripheral wall portion 62 and each nozzle hole 60a.

  In the fuel injection device 100 described above, when power supply to the coil 25 is started by energization control by the control device, the upper magnetic body 21, the fixed core 30, the movable core 44, the lower magnetic body 23, the metal shown in FIG. Magnetic flux around the housing 12 and the magnetic yoke 27 is formed. Due to the formation of such a magnetic circuit, a magnetic attractive force is generated between the fixed core 30 and the movable core 44. The valve body 40 moves toward the fixed core 30 by the generated magnetic attraction force, and then stops moving due to contact with the fixed core 30. In this way, a gap is formed between the lip portion 63 and the seal surface 52, so that gaseous fuel can flow into the nozzle hole 60a.

  In the opened state of the valve body 40 described above, the fuel supplied from the fuel tank to the fuel injection device 100 is contained in each of the upper magnetic body 21 and the adjustment member 31 in the fuel passage 15 and the fixed core. 30 and the through holes 30a and 42 of the movable core 44 are circulated in order. Part of the gaseous fuel that has reached the through hole 42 flows from the communication hole 43 to the fuel reservoir chamber 23a, and then flows into the inlet 60i from the outer peripheral side through the gap between the lip 63 and the seal surface 52. Further, another part of the gaseous fuel that has reached the through hole 42 passes through the through hole 51 and then flows into the inlet 60 i from the inner peripheral side through the gap between the lip portion 63 and the seal surface 52. The gaseous fuel that has flowed into the inflow port 60i is injected from the outflow port 60o into the internal space of the peripheral wall 62, and flows into the combustion chamber while being mixed with the intake air flowing through the intake passage 2a.

  Then, according to the energization control for stopping the power supply to the coil 25, the magnetic attractive force disappears. As a result, the valve body 40 moves toward the nozzle hole body 60 by the urging force of the elastic member 32, and then stops moving due to contact with the nozzle hole body 60. Thus, the inflow port 60i is closed when the lip portion 63 and the seal surface 52 are brought into close contact with each other. As a result, the inflow of gaseous fuel to the nozzle hole 60a is blocked, and the valve body 40 is closed.

  Next, the suppression structure 70 provided in the fuel injection device 100 will be described in detail.

  The restraining structure 70 is located at the connecting portion between the valve body 10 and the intake pipe 2, that is, on the fuel downstream side of the injection hole 60a exposed in the intake passage 2a. The suppression structure 70 suppresses the deterioration of mixing caused by the contraction accompanying the jet itself with respect to the jet of the gaseous fuel injected from the nozzle hole 60a. Specifically, the suppression structure 70 according to the first embodiment includes a peripheral wall portion 62 formed in the nozzle hole body 60 as shown in FIGS. 2 and 3. A plurality (two) of air introduction holes 71 are formed in the peripheral wall portion 62.

  The air introduction hole 71 is a cylindrical hole that penetrates the peripheral wall portion 62. The two air introduction holes 71 are opposed to each other with the central axis C interposed therebetween. The introduction hole axis Ci that defines the extending direction of the air introduction hole 71 is defined in a posture inclined toward the inner peripheral side as it is separated from the injection hole 60a along the center axis C. The air introduction hole 71 is located between two adjacent nozzle holes 60a in the circumferential direction. With the arrangement of the air introduction holes 71, the inner peripheral outlet opening 71 o that is the air outlet side in the air introduction hole 71 faces between the jets ejected from the two adjacent nozzle holes 60 a.

  With the above configuration, the jet of gaseous fuel injected from each nozzle hole 60a has a cylindrical shape partially interrupted in the circumferential direction. In this gaseous fuel jet, the outer edge has a lower pressure than the surrounding air due to the high flow velocity. Therefore, the air on the outer peripheral side of the peripheral wall 62 is sucked into the space on the inner peripheral side of the peripheral wall 62 through the air introduction hole 71 due to the action of the outer edge of the jet that tries to entrain the surrounding air. Such introduced air is introduced from the region where the jet is interrupted into the internal space of the jet without colliding with the jet, and tries to spread the jet toward the outer peripheral side (see the arrow in FIG. 3). As a result, even if the jet of gaseous fuel is accompanied by a contracted flow that contracts as it moves away from the nozzle hole 60a, the jet spread by the introduced air is dispersed in the intake passage 2a (see FIG. 1). Is possible.

  In the first embodiment described so far, the suppression structure 70 prevents a reduction in the contact area between the gaseous fuel and the air, so that the deterioration of the mixing of the gaseous fuel and the air caused by the contracted flow is suppressed. According to the above, the gaseous fuel injected from the injection hole 60a can be appropriately mixed with the air flowing through the intake pipe 2 (see FIG. 1). Therefore, it is possible to form a homogeneous air / fuel mixture suitable for combustion.

  The specific experimental results are shown in FIG. FIG. 4 shows the air-fuel mixture concentration in the combustion chamber in a cross section that divides the intake side and the exhaust side under operating conditions of an engine speed of 1600 r / min and a shaft torque of 55 Nm. In the case where the suppression structure 70 is not provided, the air-fuel mixture concentration varies greatly at various points in the combustion chamber. On the other hand, in the case where the suppression structure 70 is provided, the variation in the mixture concentration is reduced due to the effect of suppressing the deterioration of mixing. As a result, the thermal efficiency of the internal combustion engine was improved from 32.5% to 34%.

  In addition, according to the adoption of the suppression structure 70 that forms the air introduction hole 71 in the peripheral wall portion 62 around the nozzle hole 60a as in the first embodiment, air is brought into the jet stream by utilizing the pressure drop of the jet outer edge. It becomes possible to introduce. Thus, although the structure of the suppression structure 70 mentioned above is a simple structure, it can exhibit the effect which suppresses mixing deterioration reliably.

  Further, as in the first embodiment, if the outlet opening 71o of the air introduction hole 71 is directed between the jets ejected from the two adjacent injection holes 60a, the air introduced from the air introduction hole 71 is It is possible to enter the inner peripheral side of the jet without colliding with the jet. Therefore, it is possible to obtain an action of pushing the jet flow by the introduced air without reducing the momentum of the jet flow. As a result, since the dispersion of the jet is further promoted, the mixing deterioration of the air and the jet is further suppressed.

  Furthermore, in 1st embodiment, the jet flow injected from the nozzle hole 60a is a thing along the inner peripheral surface of the surrounding wall part 62 by the combination of the cylindrical surrounding wall part 62 and each nozzle hole 60a which is an arc-shaped slit. It becomes. Therefore, the jet is attracted to the peripheral wall portion 62 by the core under effect and tends to spread to the outer peripheral side. As described above, the dispersion of the jet flow is further promoted by the combined action of the peripheral wall portion 62 attracting the jet flow and the action of the introduced air spreading the jet flow. The above-described effect is further improved by the configuration in which the formation position of the injection hole 60a in the radial direction is closer to the peripheral wall portion 62 than the center of the bottom wall portion 61.

  In addition, as in the first embodiment, if the introduction hole axis Ci is inclined toward the fuel downstream side, the flow of air flowing through the air introduction hole 71 does not move in such a direction as to face the jet. Therefore, the introduction air can be smoothly sucked into the jet and exert an action of spreading the jet. Therefore, the dispersion of the jet is further promoted.

  In the first embodiment, the injection hole body 60 corresponds to the “injection hole forming member” described in the claims, and the valve body 10 corresponds to the “supply body” described in the claims.

(Second embodiment)
The second embodiment of the present invention shown in FIGS. 5 and 6 is a modification of the first embodiment. In the injection hole body 260 of the fuel injection device 200 according to the second embodiment, a plurality of cylindrical injection holes 260a are formed instead of the slit injection holes 60a (see FIG. 3) in the first embodiment. . The nozzle holes 260a are arranged at equal intervals on a virtual reference circle RC centered on the central axis C. In addition, the two air introduction holes 71 of the peripheral wall portion 62 included in the suppression structure 70 are located between the two adjacent injection holes 260a in the circumferential direction. Accordingly, the outlet opening 71o of the air introduction hole 71 is directed between the jets ejected from the two adjacent nozzle holes 260a.

  In the above configuration, even if the jet is jetted from each cylindrical nozzle hole 260a, the outer edge thereof has a lower pressure than the surrounding air. Therefore, the air on the outer peripheral side of the peripheral wall 62 is sucked into the space on the inner peripheral side of the peripheral wall 62 through the air introduction hole 71 by the action of the outer edge of the jet that tries to entrain the surrounding air (see FIG. 6). See arrow). Thus, the air introduced through the air introduction hole 71 passes between the two jets, is introduced into the space surrounded by each jet, and tries to spread each jet toward the outer peripheral side. Therefore, the jet is easily dispersed in the intake passage 2a (see FIG. 1).

  Even in the second embodiment described so far, the reduction of the contact area between the gaseous fuel and the air can be prevented by exhibiting the dispersing action by the suppression structure 70. Therefore, the deterioration of the mixing of the gaseous fuel and air caused by the contracted flow is suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1). In the second embodiment, the nozzle hole body 260 corresponds to the “hole forming member” recited in the claims.

(Third embodiment)
The third embodiment of the present invention shown in FIGS. 7 and 8 is another modification of the first embodiment. In the injection hole body 360 of the fuel injection device 300 according to the third embodiment, four air introduction holes 371 and four guides 372 are formed in the peripheral wall portion 362. The air introduction holes 371 are arranged around the central axis C at 90 ° intervals. Each air introduction hole 371 is shifted in the circumferential direction with respect to these nozzle holes 60a so as not to overlap with the four nozzle holes 60a in the radial direction. Each guide 372 is located on the inner peripheral side of each air introduction hole 371 and protrudes in a cylindrical shape from the inner peripheral surface of the peripheral wall portion 362 along the introduction hole axis Ci. The guide 372 extends the air introduction hole 371 to the inner peripheral side, thereby positioning the outlet opening 371o of the air introduction hole 371 between the jets ejected from the two adjacent nozzle holes 60a. If a virtual cylindrical surface connecting the outer peripheral surface 60b of each nozzle hole 60a is Cy, each outlet opening 371o is located on the inner peripheral side of the virtual cylindrical surface Cy in the radial direction.

  Even if the air introduction hole 371 is extended by the guide 372 as described above, the air on the outer peripheral side of the peripheral wall portion 362 is sucked to the inner peripheral side of the peripheral wall portion 362 by the low pressure generated in the jet outer edge portion. And if it is the structure which positions the exit opening 371o in the inner peripheral side rather than the virtual cylindrical surface Cy, the air which distribute | circulated the air introduction hole 371 will be reliably introduce | transduced into the inner peripheral side of a cylindrical jet (FIG. 8). See arrow). The introduced air exerts an action of spreading the cylindrical jet toward the outer peripheral side, and can make the jet easy to disperse.

  In the third embodiment described so far, the peripheral wall portion 362 that forms the guide 372 in addition to the air introduction hole 371 is included in the suppression structure 370. Even if it is such a structure, there exists an effect similar to 1st embodiment, and the reduction | decrease of the contact area of gaseous fuel and air can be prevented. Therefore, the deterioration of the mixing of the gaseous fuel and air caused by the contracted flow is suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1).

  In addition, if the outlet opening 371o is positioned between two adjacent jets as in the third embodiment, the introduced air can surely enter the inner peripheral side of each jet. Therefore, each jet is spread to the outer peripheral side by the introduced air, and a contact area with the surrounding air is surely ensured. Therefore, the mixing deterioration of gaseous fuel and air can be further suppressed.

  Further, as in the third embodiment, since each guide 372 and each nozzle hole 60a are shifted from each other in the circumferential direction, the jet flow ejected from each nozzle hole 60a avoids the guide 372 protruding to the inner peripheral side. While being dispersible. According to the above, mixing of gaseous fuel and air is further promoted. In the third embodiment, the nozzle hole body 360 corresponds to the “hole forming member” described in the claims.

(Fourth embodiment)
The fourth embodiment of the present invention shown in FIGS. 9 and 10 is still another modification of the first embodiment. In the fuel injection device 400 according to the fourth embodiment, the injection hole 460 a is included in the suppression structure 470 together with the peripheral wall portion 462. The nozzle hole 460a is an arc-shaped slit formed in the nozzle hole body 460, and extends annularly so that the central angle around the central axis C is 180 ° or more. In the fourth embodiment, the central angle of the nozzle hole 460a is defined to be about 270 °, for example. Due to the shape of the nozzle hole 460a, both the inlet 460i and the outlet 460o are horseshoe-shaped openings. The peripheral wall portion 462 is erected from the outer edge of the bottom wall portion 461 so as to surround the outer peripheral side of the injection hole 460a which is a C-shaped annular long hole. The peripheral wall part 462 is substantially the same as the peripheral wall part 62 (refer FIG. 2) of 1st embodiment.

  In the above configuration, the gaseous fuel jet injected from the outlet 460o extending in a C shape has a cylindrical shape with a part in the circumferential direction interrupted. Therefore, the air in the vicinity of the nozzle hole body 460 passes through the region where the jet flow is formed between the two edges of the jet due to the action of the outer edge of the jet trying to entrain the surrounding air. (See the arrow in FIG. 10). Thus, the jet that is spread toward the outer peripheral side by the air introduced to the inner peripheral side of the jet becomes easily dispersed.

  Even in the configuration in which the horseshoe-shaped injection hole 460a exhibits the function as the suppression structure 470 as in the fourth embodiment described so far, the same effect as in the first embodiment is achieved, and the gas fuel and the air Reduction of the contact area can be prevented. Therefore, the deterioration of the mixing of the gaseous fuel and air caused by the contracted flow is suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1).

  In addition, in the fourth embodiment, the cylindrical jet injected from the injection hole 460a is attracted to the peripheral wall portion 462 by the core under effect. Therefore, the shape of the jet itself that is substantially cylindrical is easily maintained. In this way, the shape of the jet is maintained by the action of the peripheral wall portion 462, so that air can be reliably introduced to the inner peripheral side of the jet. As a result, the action of pushing the jet toward the outer peripheral side by the air introduced to the inner peripheral side is surely exerted, and the contact area between the gaseous fuel and the air can be further ensured. As described above, the suppression structure 470 in which the annularly extending nozzle hole 460a and the cylindrical peripheral wall portion 462 are combined can further suppress the deterioration of mixing of gaseous fuel and air caused by the contracted flow. In the fourth embodiment, the nozzle hole body 460 corresponds to the “hole forming member” recited in the claims.

(Fifth embodiment)
The fifth embodiment of the present invention shown in FIGS. 11 and 12 is a modification of the fourth embodiment. In the fuel injection device 500 according to the fifth embodiment, a set of air introduction holes 571 and guides 572 are formed in the peripheral wall portion 562 of the injection hole body 560. The air introduction hole 571 and the guide 572 have substantially the same configuration as the air introduction hole 371 and the guide 372 (see FIG. 7) in the third embodiment. The air introduction hole 571 and the guide 572 are arranged in a section from one end to the other end in the extending direction of the injection hole 460a in the circumferential direction. The air introduction hole 571 is extended toward the central axis C by the guide 572, so that the outlet opening 571o is positioned between both edges of the jet flow ejected from the injection hole 460a. The outlet opening 571o is located on the inner peripheral side in the radial direction with respect to the virtual cylindrical surface Cy defined at the position of the outer peripheral surface 460b of the nozzle hole 460a.

  In the above configuration, the air on the outer peripheral side of the peripheral wall portion 562 is sucked into the inner peripheral side of the peripheral wall portion 562 through the air introduction hole 571 due to the action of the outer edge of the jet that tries to entrain the surrounding air. And according to arrangement | positioning of the outlet opening 571o mentioned above, the air which distribute | circulated the air introduction hole 571 is introduce | transduced into the inner peripheral side of a jet flow through the area | region where the said jet flow interrupted formed between the both edges of a jet flow (FIG. 12 arrows). The introduced air exerts an action of spreading the cylindrical jet toward the outer peripheral side, and makes it easy to disperse the jet.

  Even if the suppression structure 570 is configured by combining the air introduction hole 571 with the horseshoe-shaped injection hole 460a as in the fifth embodiment described so far, as in the fourth embodiment, the gaseous fuel and the air Reduction of the contact area can be prevented. Therefore, the deterioration of the mixing of the gaseous fuel and air caused by the contracted flow is suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1). In the fifth embodiment, the injection hole body 560 corresponds to the “injection hole forming member” recited in the claims.

(Sixth embodiment)
The sixth embodiment of the present invention shown in FIGS. 13 and 14 is still another modification of the first embodiment. In the injection hole body 660 of the fuel injection device 600 according to the sixth embodiment, four notches 673 are formed with a peripheral wall portion 662. The notch 673 is a recess that is recessed from the end surface 662a at the front end in the standing direction of the peripheral wall portion 662 toward the bottom wall portion 661 along the central axis C. The notches 673 are arranged around the central axis C at 90 ° intervals. The notch 673 is located so as to be shifted from the four nozzle holes 60a in the circumferential direction. The notch 673 integrally forms an air introduction hole 671 and an enlarged opening 674 that enlarges the air introduction hole 671 to the end face 662a.

  In the sixth embodiment described so far, the air introduction hole 671 formed by the notch 673 exhibits the function as the suppression structure 670. Even with such a restraining structure 670, air can be introduced into the jet, so that the action of expanding the jet by the introduced air is exerted, and the reduction in the contact area between the gaseous fuel and the air is prevented. Can be. As a result, the deterioration of the mixing of the gaseous fuel and the air caused by the contracted flow is suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1).

  In addition, when the air introduction hole 671 is expanded to the end surface 662a of the peripheral wall portion 662 by the expansion opening 674 as in the sixth embodiment, more air can be introduced into the jet flow. . Thus, the jet spread by a large amount of air is further dispersed to facilitate mixing with the air. In the sixth embodiment, the injection hole body 660 corresponds to the “injection hole forming member” recited in the claims.

(Seventh embodiment)
The seventh embodiment of the present invention shown in FIGS. 15 and 16 is a modification of the fifth embodiment. In the injection hole body 760 of the fuel injection device 700 according to the seventh embodiment, the peripheral wall 762 is provided with a notch 773 together with the guide 772. The notch 773 is substantially the same as the notch 673 (see FIG. 13) in the sixth embodiment, and forms an air introduction hole 771 and an enlarged opening 774 continuous with the air introduction hole 771. The air introduction hole 771 is extended by the guide 772 to the inner peripheral side where the central axis C is located along the radial direction. In addition, the air introduction hole 771 is expanded to the end surface 762a by the expansion opening 774.

  In the suppression structure 770 of the seventh embodiment having the above-described configuration, the air introduction hole 771 is expanded by the notch 773, so that more air can be introduced into the inner peripheral side of the jet (see the arrow in FIG. 16). ). Therefore, the action of expanding the jet flow injected from the injection hole 460a by the introduced air is strengthened, and the reduction of the contact area between the gaseous fuel and the air can be further prevented. As a result, the deterioration of the mixing of the gaseous fuel and the air caused by the contracted flow is further suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1). In the seventh embodiment, the injection hole body 760 corresponds to the “injection hole forming member” recited in the claims.

(Eighth embodiment)
The eighth embodiment of the present invention shown in FIGS. 17 and 18 is still another modification of the first embodiment. The injection hole body 860 of the fuel injection device 800 according to the eighth embodiment is provided with an inner peripheral guide wall portion 875. The inner peripheral guide wall portion 875 is a configuration included in the suppression structure 870 of the eighth embodiment, and is erected along the central axis C from the inner peripheral side region of each nozzle hole 60a in the bottom wall portion 861. . The inner peripheral guide wall portion 875 is formed higher than the peripheral wall portion 862, and protrudes in the jet movement direction from the peripheral wall portion 862. The inner peripheral guide wall portion 875 forms a conical inner peripheral inclined surface 875a that inclines toward the outer peripheral side as the distance from the bottom wall portion 861 increases. The outermost edge of the inner peripheral slope 875a is located slightly on the inner peripheral side with respect to the virtual cylindrical surface Cy that connects the inner peripheral surfaces 860c of the nozzle holes 60a arranged in a ring shape. With such a configuration, direct collision of each jet with the inner peripheral slope 875a is avoided. The inner circumferential guide wall portion 875 guides the jet flow ejected from each nozzle hole 60a to the outer circumferential side by an inner circumferential inclined surface 875a that expands in a tapered surface shape as the distance from the nozzle hole 60a increases along the central axis C.

  In the configuration in which the inner peripheral guide wall portion 875 is used as the restraining structure 870 as in the above configuration, the inner peripheral guide wall portion 875 is in contact with the jet flow and directs the moving direction toward the outer peripheral side. Induce. Due to the guiding action of the inner peripheral guide wall portion 875, the jets ejected from the respective nozzle holes 60a are spread toward the outer peripheral side. As a result, similarly to the first embodiment, the suppression structure 870 according to the eighth embodiment prevents a reduction in the contact area between the gaseous fuel and the air. Therefore, the deterioration of the mixing of the gaseous fuel and air caused by the contracted flow is suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1). In the eighth embodiment, the nozzle hole body 860 corresponds to the “hole forming member” recited in the claims.

(Ninth embodiment)
The ninth embodiment of the present invention shown in FIGS. 19 and 20 is a modification of the eighth embodiment. In the nozzle hole body 960 of the fuel injection device 900 according to the ninth embodiment, the inner peripheral guide wall portion 975 is formed in an enlarged cylindrical shape that increases the outer diameter in the moving direction of the jet. With such a configuration, the inner peripheral guide wall 975 forms an air pocket 975c on the inner peripheral side of the inner peripheral inclined surface 975a. The air pocket 975c is a recess that opens in the direction of jet movement. The air pocket 975c is formed from the end surface 975b to the bottom wall portion 961 in the protruding direction of the inner circumferential guide wall portion 975, and has a function of storing air.

  If the air pocket 975c is formed on the inner peripheral side of the inner peripheral inclined surface 975a that guides the jet to the outer peripheral side as in the above configuration, the air in the air pocket 975c is directed in the moving direction of the jet. From the opened opening, it is supplied to the inner peripheral side of the jet. If air is supplied to the inside of the jet in this way, the jet tends to spread to the outer peripheral side according to the guidance of the inner peripheral slope 975a. As a result, the suppression structure 970 according to the ninth embodiment also prevents the reduction of the contact area between the gaseous fuel and the air, similar to the eighth embodiment. Therefore, the deterioration of the mixing of the gaseous fuel and air caused by the contracted flow is suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1). In the ninth embodiment, the injection hole body 960 corresponds to the “injection hole forming member” described in the claims, and the air pocket 975c corresponds to the “concave portion” described in the claims.

(Tenth embodiment)
The tenth embodiment of the present invention shown in FIGS. 21 and 22 is another modification of the eighth embodiment. In the fuel injection device 1000 according to the tenth embodiment, the injection hole body 1060 is provided with an outer peripheral guide wall portion 1076 and an inner peripheral guide wall portion 1075. The outer peripheral guide wall 1076 and the inner peripheral guide wall 1075 are included in the suppression structure 1070 in the tenth embodiment. The position of each outlet 60o of each nozzle hole 60a in the radial direction is closer to the outer peripheral guide wall 1076 than the inner peripheral guide wall 1075.

  The outer peripheral guide wall portion 1076 is a peripheral wall portion erected from the bottom wall portion 1061 so as to surround the outer peripheral side of the plurality of nozzle holes 60a. The outer peripheral guide wall 1076 forms a conical outer peripheral inclined surface 1076a that inclines toward the outer peripheral side as the distance from the nozzle hole 60a increases along the central axis C. The outer peripheral guide wall portion 1076 guides the jet flow ejected from each nozzle hole 60a to the outer peripheral side by the outer peripheral inclined surface 1076a that expands in a tapered surface shape as the distance from the nozzle hole 60a increases.

  On the other hand, the inner peripheral guide wall portion 1075 forms a conical inner peripheral inclined surface 1075a that inclines toward the inner peripheral side as the distance from the nozzle hole 60a increases along the central axis C. The inner peripheral guide wall portion 1075 guides the jet flow ejected from each nozzle hole 60a toward the inner peripheral side by the inner peripheral inclined surface 1075a that is reduced to a tapered surface shape.

  In the above configuration, the cylindrical space formed between the outer peripheral guide wall portion 1076 and the inner peripheral guide wall portion 1075 gradually increases the cross-sectional area as the distance from the nozzle hole 60a increases along the central axis C. ing. According to such a diffuser shape, the jet is attracted to both the outer peripheral slope 1076a and the inner peripheral slope 1075a located inside and outside in the radial direction by the core under effect. As described above, since the dispersion of the jet flow is promoted even in the configuration in which the diffuser provided downstream of the nozzle hole 60a exhibits the function of the suppression structure 1070, the contact between the diffused gaseous fuel and air is the same as in the eighth embodiment. Area reduction can be prevented. Therefore, the mixing deterioration of the gaseous fuel and air caused by the contracted flow is suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1).

  In addition, in the tenth embodiment, since the position of the nozzle hole 60a in the radial direction is brought close to the outer peripheral guide wall 1076 on the outer peripheral side, the effect of guiding the jet flow to the outer peripheral side is exerted strongly. Therefore, the jet flow is dispersed over a wide range mainly by being pushed outward. Therefore, the mixing deterioration of gaseous fuel and air can be further suppressed. In the tenth embodiment, the nozzle hole body 1060 corresponds to the “hole forming member” recited in the claims.

(Eleventh embodiment)
The eleventh embodiment of the present invention shown in FIGS. 23 and 24 is a modification of the ninth embodiment. The injection hole body 1160 of the fuel injection device 1100 according to the eleventh embodiment is provided with a peripheral wall portion 1162 and an inner peripheral guide wall portion 975 included in the suppression structure 1170.

  Four air introduction holes 1171 a are formed in the peripheral wall portion 1162. The air introduction hole 1171a is a through-hole penetrating the peripheral wall portion 1162, and communicates the outer peripheral side and the inner peripheral side of the peripheral wall portion 1162. The air introduction hole 1171 a introduces air on the outer peripheral side of the peripheral wall portion 1162 to the inner peripheral side of the peripheral wall portion 1162. On the other hand, four air introduction holes 1171 b are formed in the inner peripheral guide wall portion 975. The air introduction hole 1171b opens to the inner peripheral slope 975a, and connects the air pocket 975c and the outer peripheral side of the inner peripheral guide wall 975. The air introduction hole 1171b introduces air in the air pocket 975c to the inner peripheral side of the jet flow. The air introduction holes 1171a and 1171b described above are arranged around the central axis C at intervals of 90 °. Each air introduction hole 1171a, 1171b is shifted from the four injection holes 60a in the circumferential direction. Each of the air introduction holes 1171a and 1171b extends along a radial direction orthogonal to the central axis C.

  If the air introduction hole 1171b that communicates with the air pocket 975c is formed in the inner peripheral slope 975a that guides the jet flow to the outer peripheral side as in the above configuration, the air in the air pocket 975c is transferred to the inner peripheral slope 975a. Is supplied to the inner peripheral side of the jet flowing along. In addition, the air on the outer peripheral side of the peripheral wall portion 1162 is supplied to the jet through the air introduction hole 1171a. Thus, by supplying air from the inner peripheral side and the outer peripheral side of the jet, the jet becomes more difficult to contract and easily spreads to the outer peripheral side along the inner peripheral slope 975a. As a result, the deterioration of the mixing of the gaseous fuel and the air is reliably suppressed, and the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1). In the eleventh embodiment, the nozzle hole body 1160 corresponds to a “hole nozzle forming member” recited in the claims.

(Twelfth embodiment)
The twelfth embodiment of the present invention shown in FIGS. 25 and 26 is still another modification of the first embodiment. The nozzle hole body 1260 of the fuel injection device 1200 according to the twelfth embodiment is formed in a disk shape. The nozzle hole body 1260 is provided with a first nozzle hole 1260a that penetrates the nozzle hole body 1260 in the thickness direction and a second nozzle hole 1277 that branches from the first nozzle hole 1260a in the nozzle hole body 1260. It has been. The first nozzle hole 1260a is a slit extending in an arc around the central axis C, similarly to the nozzle hole 60a (see FIG. 2) of the first embodiment. The 2nd nozzle hole 1277 is the structure contained in the suppression structure 1270 of 12th embodiment. The second nozzle hole 1277 extends from the middle of the first nozzle hole 1260a to the outer peripheral side, and an outlet 1277o is opened on the side surface 1264 of the nozzle hole body 1260. The second nozzle hole 1277 is formed in a slit shape.

  In the above configuration, a jet is ejected not only from the outlet 1260o of the first nozzle hole 1260a but also from the outlet 1277o of the second nozzle hole 1277. By increasing the number of the outlets 1260o and 1277o formed in the nozzle hole body 1260 in this way, even if the individual jets are accompanied by contraction, the contact area between the gaseous fuel and the air can be gained. Thus, even in the suppression structure 1270 configured to branch the second injection hole 1277 from the first injection hole 1260a, the deterioration of the mixing of the gaseous fuel and air is suppressed by achieving high dispersion of the jet flow. Accordingly, the gaseous fuel is properly mixed with the air flowing through the intake pipe 2 (see FIG. 1). In the twelfth embodiment, the nozzle hole body 1260 corresponds to the “hole forming member” recited in the claims.

(Thirteenth embodiment)
The thirteenth embodiment of the present invention shown in FIGS. 27 and 28 is a modification of the twelfth embodiment. In the fuel injection device 1300 according to the thirteenth embodiment, the injection hole body 1360 is provided with an inner peripheral guide wall portion 1375 that is substantially the same as the inner peripheral guide wall portion 975 (see FIG. 23) of the eleventh embodiment. Yes. The restraining structure 1370 of the thirteenth embodiment includes an inner circumferential guide wall 1375 in addition to the second injection hole 1277. The inner peripheral guide wall portion 1375 is erected along the central axis C from the disc-shaped main body portion 1361 of the nozzle hole body 1360 toward the moving direction of the jet flow. The inner peripheral guide wall portion 1375 is provided in a region on the inner peripheral side of each outflow port 1260o. The inner peripheral guide wall 1375 is formed with an air introduction hole 1171b that opens to the inner peripheral inclined surface 975a and an air pocket 975c.

  In the thirteenth embodiment described so far, in addition to the jet flow being ejected from the outlet 1277o toward the outer peripheral side, the jet flow ejected from the first injection hole 1260a is also guided to the inner peripheral guide wall portion 1375. And can spread to the outer peripheral side. By such dispersion of the jets, the contact area between the gaseous fuel and air can be increased, so that the deterioration of the mixing of the gaseous fuel and air is further suppressed. Accordingly, the gaseous fuel is appropriately mixed with the air flowing in the intake pipe 2 (see FIG. 1).

  In the thirteenth embodiment, the injection hole body 1360 corresponds to the “injection hole forming member” recited in the claims.

(14th embodiment)
FIG. 29 shows a gaseous fuel injection system including a fuel injection device 1400 according to the fourteenth embodiment of the present invention. The fuel injection device 1400 is attached to the intake pipe 2 located upstream of the intake port 5 in the internal combustion engine. The gaseous fuel injected from the fuel injection device 1400 into the intake passage 2a formed by the intake port 5 and the intake pipe 2 flows into the combustion chamber 4 during the intake stroke when the intake valve 6 opens while mixing with the intake air. To do. In addition to the fuel injection device 1400, the internal combustion engine provided with the fuel injection device 1400 is provided with a liquid fuel injection device 110 that injects liquid fuel such as gasoline and ethanol. The internal combustion engine can switch the fuel supplied to the combustion chamber 4 between gaseous fuel and liquid fuel.

  The fuel injection device 1400 is connected to a pressure regulator 130 and an engine control unit (hereinafter “ECU”) 120 provided in the internal combustion engine. The pressure regulator 130 supplies the fuel injector 1400 with the pressure of the gaseous fuel stored in the fuel tank in a compressed state. The ECU 120 generates a control signal for controlling the displacement of the valve body 40 (see FIG. 1) of the fuel injection device 1400. A control signal output from ECU 120 is input to fuel injection device 1400.

  The fuel injection device 1400 includes a fuel hose 90 and an adapter 1460 in addition to the valve body 10 and the valve body 40 (see FIG. 1) that are substantially the same as those of the first embodiment.

  The fuel hose 90 is formed in a tubular shape from a flexible material such as an elastomer. The fuel hose 90 has a multi-layer structure, and thus has high fuel permeation resistance so that gaseous fuel passing through the inner peripheral side does not permeate to the outer peripheral side. The fuel hose 90 has high flexibility, thereby increasing the degree of freedom of the mounting position and mounting posture of the valve body 10. A main body connecting portion 91 and an adapter connecting portion 92 are formed at each end of the fuel hose 90, respectively. The main body connecting portion 91 is externally fitted to the valve body 10. The adapter connection portion 92 is externally fitted to the adapter 1460.

  As shown in FIGS. 30 and 31, the adapter 1460 is formed in a bottomed cylindrical shape with a metal material or the like. The adapter 1460 includes a nozzle hole forming portion 1461, a flange portion 1465, a hose connection portion 1464, and an intake pipe connection portion 1466.

  The nozzle hole forming portion 1461 is provided at the bottom of the adapter 1460 formed in a hemispherical shape. In the nozzle hole forming portion 1461, a plurality of (for example, five) through holes are formed as the nozzle holes 1460a. The nozzle hole forming portion 1461 is provided with one central nozzle hole 1461ac and a plurality of side nozzle holes 1461as. The central nozzle hole 1461ac is located at the center of the nozzle hole forming portion 1461 and extends in a cylindrical hole shape along the central axis C of the adapter 1460. The respective side injection holes 1461as are arranged around the central injection hole 1461ac at equal intervals. The nozzle hole axis Ch defining the axial direction of each side nozzle hole 1461as is set in a direction inclined with respect to the central axis C along the axial direction of the adapter 1460. Each side injection hole 1461as extends in a cylindrical hole shape in a direction inclined with respect to the central axis C.

  The flange portion 1465 is a disc-shaped portion that protrudes from the middle portion of the adapter 1460 in the axial direction to the outer peripheral side. The hose connection portion 1464 is a cylindrical portion formed between the flange portion 1465 and the opening 1462 of the adapter 1460. The adapter 1460 pushes the hose connection portion 1464 into the fuel hose 90 until the flange portion 1465 hits the end surface of the adapter connection portion 92 (see FIG. 29). The adapter connection portion 92 that is externally fitted to the hose connection portion 1464 is fixed to the adapter 1460 by a fastener such as a hose clamp.

  The intake pipe connecting portion 1466 is formed closer to the nozzle hole forming portion 1461 than the flange portion 1465. A male thread portion is formed on the outer peripheral surface of the intake pipe connecting portion 1466. The intake pipe connecting portion 1466 is fastened to a female screw portion formed in the intake pipe 2. The adapter 1460 is fixed to a mounting hole of the intake pipe 2 that forms a female screw portion in a posture substantially perpendicular to the wall surface of the intake pipe 2. By attaching the intake pipe connecting portion 1466 to the intake pipe 2, the nozzle hole forming portion 1461 formed in a dome shape protrudes into the intake passage 2 a.

  Details of the control for injecting the gaseous fuel into the intake pipe 2 by the gaseous fuel injection system will be described with reference to FIGS. 32 and 33. FIG. In FIGS. 32 and 33, the injection start timing and the injection completion timing of the gaseous fuel indicate the opening timings (IVO, EVO) and closing timings (IVC, EVO) of the intake valve 6 and the exhaust valve 7 (see FIG. 29). EVC) and the crank angle linked to the piston 9 (see FIG. 29).

  FIG. 32 shows injection control at the time of transient operation in which the crankshaft torque is increased or decreased by changing the throttle opening or the like. By providing the fuel hose 90 between the valve body 10 and the intake pipe 2, the distance from the valve body 10 to the combustion chamber 4 is increased. As a result, part of the gaseous fuel supplied from the fuel injection device 1400 may remain in the intake pipe without reaching the combustion chamber 4. Therefore, during transient operation, the actual air-fuel ratio in the combustion chamber 4 tends to deviate from the target air-fuel ratio.

  In order to avoid such deterioration of controllability of the air-fuel ratio, when the internal combustion engine is in a transient operation state, the injection of gaseous fuel into the intake pipe 2 in a specific one cycle is the bottom dead center ( BDC). The gaseous fuel injection is completed before the top dead center (TDC) at which the intake stroke starts and before the opening timing (IVO) of the intake valve 6. As a result, the gaseous fuel injected from the fuel injection device 1400 reaches the intake port 5 before the start of the intake stroke, and flows into the cylinder when the intake valve 6 is opened. According to the above, since the residual gas in the intake port 5 can be reduced, the gaseous fuel supplied from the fuel injection device 1400 to achieve the target air-fuel ratio can flow into the combustion chamber 4 without excess or deficiency. Therefore, it is possible to avoid deterioration of the air-fuel ratio controllability and improve drivability performance.

  However, since the gaseous fuel is injected into the intake pipe 2 before the intake stroke, it may be necessary to supply the gaseous fuel into the intake pipe 2 at a timing when the air flow in the intake pipe 2 is weak. . Therefore, in the fourteenth embodiment, the adapter 1460 is positioned at the connection portion between the fuel hose 90 and the intake pipe 2. As a result, the gaseous fuel that has passed through the nozzle holes 1460a is dispersed in the intake pipe 2 even when it is difficult to promote the mixing of the gaseous fuel and air by diffusing the gaseous fuel using the intake air flow. As described above, the gaseous fuel injected from the injection hole 1460a is appropriately mixed even with air having a weak flow without depending on the intake flow.

  On the other hand, FIG. 33 shows injection control during steady operation in which the crankshaft torque is substantially constant. During steady operation, even if gaseous fuel remains in the intake pipe 2, the remaining gaseous fuel is used in the next cycle, so that the target air-fuel ratio (for example, theoretical air-fuel ratio) is generally achieved. It becomes possible to drive at. Therefore, when the internal combustion engine is in a steady operation state, the injection of gaseous fuel into the intake pipe 2 is started after the intake valve 6 is opened and is completed before the bottom dead center of the intake stroke. In this way, the gaseous fuel arranged in a highly dispersed manner in the intake pipe 2 in the intake stroke is diffused by a strong intake flow flowing through the intake passage 2a in addition to the diffusion action of the injection holes 1460a, so that mixing of air Is further promoted.

  According to the fourteenth embodiment described so far, the gaseous fuel is dispersed by the nozzle holes 1460a of the adapter 1460, thereby promoting the mixing of the gaseous fuel into the weakly flowing air. As a result, the deviation of the equivalence ratio in the combustion chamber 4 is improved, and the formation of a homogeneous air-fuel mixture suitable for combustion is realized.

  In addition, as in the fourteenth embodiment, when the internal combustion engine is in a transient operation state, the gaseous fuel is dispersed by the intake flow if the injection of the gaseous fuel is completed before the intake valve 6 is opened. Becomes difficult to be demonstrated. Therefore, the dispersing action of the gaseous fuel by the nozzle holes 1460a can contribute more effectively to the formation of a homogeneous air-fuel mixture.

  In the fourteenth embodiment, gaseous fuel injection is performed during the intake stroke when it is difficult for the air-fuel ratio controllability to deteriorate due to the addition of the fuel hose 90. According to the above, since the dispersing action of the gaseous fuel by the nozzle hole 1460a exhibits both the dispersing action by the intake air flow, the formation of a homogeneous air-fuel mixture can be more reliably formed.

  Further, in the fourteenth embodiment, the plurality of side injection holes 1461as formed in a posture inclined with respect to the central axis C injects gaseous fuel in a direction away from the central axis C. Therefore, the effect | action which disperse | distributes gaseous fuel to the intake passage 2a can be exhibited more strongly. Therefore, the air-fuel mixture in the combustion chamber 4 tends to become more homogeneous.

  In the fourteenth embodiment, the fuel hose 90 corresponds to an “extension member” recited in the claims, and the ECU 120 corresponds to a “control unit” recited in the claims. Further, the adapter 1460 corresponds to a “hole formation member” described in the claims, and the injection hole formation portion 1461 corresponds to a “bottom portion” described in the claims.

(Fifteenth embodiment)
The fifteenth embodiment of the present invention shown in FIGS. 34 and 35 is a modification of the fourteenth embodiment. In the fuel injection device according to the fifteenth embodiment, the shape of the adapter 1560 is different from that of the fourteenth embodiment. In addition to the hose connection portion 1464, the flange portion 1465, and the intake pipe connection portion 1466 that are substantially the same as those of the fourteenth embodiment, the adapter 1560 is formed with an injection hole forming portion 1561.

  The nozzle hole forming portion 1561 is provided at the bottom of the adapter 1560 formed in a disc shape. The plurality of nozzle holes 1560a formed in the nozzle hole forming portion 1561 includes one central nozzle hole 1561ac and four side nozzle holes 1561as arranged at equal intervals around the central nozzle hole 1561ac. Yes. The nozzle hole axis Ch defining the axial direction of each side nozzle hole 1561as is set in a direction inclined with respect to the central axis line C along the axial direction of the adapter 1460, as in the fourteenth embodiment.

  The above adapter 1560 is fixed to the mounting hole of the intake pipe 2 in a posture substantially perpendicular to the wall surface of the intake pipe 2. Since the plate surface direction of the nozzle hole forming portion 1561 is substantially perpendicular to the central axis C, the amount of protrusion of the nozzle hole forming portion 1561 to the intake passage 2a is suppressed. As described above, it is possible to avoid an increase in intake loss caused by the nozzle hole forming portion 1561 hindering the air flow toward the inside of the cylinder.

  In the fifteenth embodiment described so far, the mixing of the gaseous fuel into the air can be promoted by the action of each nozzle hole 1560a to disperse the gaseous fuel. In addition, the configuration in which the projection amount of the nozzle hole forming portion 1561 into the intake passage 2a is reduced makes it difficult for the efficiency of filling into the cylinder to decrease.

  In the fifteenth embodiment, the adapter 1560 corresponds to an “injection hole forming member” described in the claims, and the injection hole formation portion 1561 corresponds to a “bottom” in the claims.

(Sixteenth embodiment)
The sixteenth embodiment of the present invention shown in FIGS. 36 and 37 is another modification of the fourteenth embodiment. In the fuel injection device according to the sixteenth embodiment, the shape of the adapter 1660 is different from that of the fourteenth embodiment. In addition to the hose connection portion 1464, the flange portion 1465, and the intake pipe connection portion 1466 that are substantially the same as those of the fourteenth embodiment, the adapter 1660 is formed with an injection hole forming portion 1661.

  The nozzle hole forming portion 1661 is provided at the bottom of the adapter 1660 formed in a hemispherical shape. The nozzle hole forming portion 1661 includes one central nozzle hole 1661ac substantially identical to each nozzle hole 1461ac, 1461as (see FIG. 30) of the fourteenth embodiment, and a plurality (four) of side nozzle holes 1661as. Is formed. In addition, the multiple nozzle holes 1660a of the adapter 1660 include a plurality (four) of peripheral wall nozzle holes 1661ar. The peripheral wall injection holes 1661ar are arranged at equal intervals around the central injection hole 1661ac and the side injection holes 1661as. Each peripheral wall injection hole 1661ar is formed across a dome-shaped bottom and a cylindrical peripheral wall. Each circumferential wall injection hole 1661ar is arranged with a circumferential position shifted from each side injection hole 1661as, and is located at an equal distance from two adjacent side injection holes 1661as. The nozzle hole axis that defines the axial direction of each peripheral wall nozzle hole 1661ar is set in a direction substantially orthogonal to the central axis C of the adapter 1660.

  Also in the sixteenth embodiment described so far, the mixing of the gaseous fuel into the air can be promoted by the action of each nozzle hole 1660a to disperse the gaseous fuel. In addition, the structure in which the gaseous fuel is injected from the respective peripheral wall injection holes 1661ar toward the outer peripheral side can more reliably exert the dispersing action of the gaseous fuel.

  In the sixteenth embodiment, the adapter 1660 corresponds to the “injection hole forming member” described in the claims, and the injection hole formation portion 1661 corresponds to the “bottom” in the claims.

(Other embodiments)
Although a plurality of embodiments according to the present invention have been described above, the present invention is not construed as being limited to the above embodiments, and can be applied to various embodiments and combinations without departing from the gist of the present invention. can do.

  In the first to thirteenth embodiments, the valve body has a configuration in which the resin housing 11 is fixed to the intake pipe via an O-ring. However, the main structure which accommodates a valve body, a drive part, etc. among valve bodies can be installed in the position spaced apart from the intake pipe like the said 14th-17th embodiment.

  Specifically, in the fourteenth to seventeenth embodiments, a fuel hose made of a flexible tubular member such as a rubber hose is connected to the valve body, and one end of the tubular member is connected to the core housing or the resin housing. . Further, the other end of the tubular member is connected to a nozzle hole body fixed to the intake pipe. With such a configuration, the degree of freedom of the mounting position of the valve body can be increased. In addition, by allowing the tubular member to bend, the degree of freedom of the mounting posture of the valve body can be further increased.

  And the gaseous fuel in the above-mentioned structure is supplied to an adapter via the fuel passage continuously formed in each inside of a core housing and a rubber hose, and is injected from an injection hole into intake passage 2a (refer to Drawing 1). . Even in these modified examples, if the above-described suppression structure is provided at the connection portion between the tubular member and the intake pipe, the deterioration of mixing of the gaseous fuel and the air can be suppressed. That is, the structure of the nozzle hole body of the first to thirteenth embodiments is applicable to the adapters of the fourteenth to seventeenth embodiments. Similarly, the configurations of the adapters of the fourteenth to seventeenth embodiments are also applicable to the nozzle hole bodies of the first to thirteenth embodiments.

  In the said embodiment, the nozzle hole body which forms a nozzle hole, the surrounding wall part, the inner peripheral induction wall part, etc. were integrally formed by one member. However, each component included in the suppression structure may be formed by a member different from the nozzle hole body and joined to the nozzle hole body. Or the member which forms each structure contained in the suppression structure can be attached to the structure different from a nozzle hole body.

  Further, the arrangement, shape, number, and the like of the nozzle holes formed in the nozzle hole body and the adapter can be changed as appropriate. For example, the nozzle hole can be formed in a tapered shape so that the flow path area is enlarged. Moreover, also about the 2nd nozzle hole of the said 12th, 13th embodiment, arrangement | positioning, a shape, a number, etc. can be suitably changed according to the form of a 1st nozzle hole.

  In the first embodiment and the like, the outlet opening of the air introduction hole is shifted in the circumferential direction with respect to each injection hole, and the introduction air can be injected toward the region where the jet flow is interrupted. However, the outlet opening may be disposed on the outer peripheral side of each nozzle hole, and the introduction air may be injected toward the outer peripheral portion of the jet flow injected from the nozzle hole. Even in such a configuration, the action of reducing contraction is exhibited by supplying air to the outer edge portion of the jet.

  In the third and fifth embodiments and the like, the outlet opening is provided on the inner peripheral side of the virtual cylindrical surface Cy connecting the outer peripheral surfaces of the injection holes by the extension of the air introduction hole by the guide. Such an outlet opening can be positioned on the inner peripheral side of the virtual cylindrical surface connecting the inner peripheral surfaces of the nozzle holes by further extending the guide to the inner peripheral side. Further, the outlet opening may be disposed so as to intersect with the virtual cylindrical surface Cy connecting the outer peripheral surface of the nozzle hole, or may be provided on the outer peripheral side of the virtual cylindrical surface Cy.

  In the first and third embodiments and the like, the introduction hole axis Ci is defined in a posture inclined toward the inner peripheral side away from the injection hole. However, the direction of the introduction hole axis Ci can be changed as appropriate, and may be inclined toward the outer periphery as the distance from the injection hole increases along the center axis C. In addition, the introduction hole axis line Ci extends along the radial direction so as to intersect the center axis line C, but may be inclined in the circumferential direction so as to have a twisted positional relationship with respect to the center axis line C. .

  As for the air introduction holes whose extending direction is defined by the introduction hole axis Ci described above, the flow channel area, arrangement, number, and the like can be appropriately changed. Moreover, the shape of the surrounding wall part which forms an air introduction hole is not limited to the above cylindrical shapes, You may be made into an elliptical cylinder shape, a cylindrical shape with a polygonal cross section, etc. Further, the peripheral wall portion does not have to completely surround the entire circumference of each nozzle hole, and can be formed in a partially interrupted cylindrical shape.

  Each adapter of the fourteenth to seventeenth embodiments is configured to be screwed into a mounting hole formed in the intake pipe. However, the attachment method for attaching the adapter to the intake pipe can be changed as appropriate. Further, the mounting posture of the adapter to the intake pipe does not need to be defined substantially perpendicular to the intake pipe, and can be changed as appropriate. For example, the adapter can be fixed to the intake pipe in an inclined posture in which the direction of the central axis is directed to the downstream side of the intake passage. According to this mounting posture, the gaseous fuel is injected from each nozzle hole along the flow of the intake air flow in the intake pipe. As a result, the mixing of gaseous fuel and air can be further promoted.

  In the fourteenth to seventeenth embodiments, the gaseous fuel injection that has been performed in the intake stroke during the steady operation of the internal combustion engine may be started at an earlier timing. For example, the injection of gaseous fuel is started before the opening timing of the intake valve and is completed during the opening of the intake valve. Even if such injection control is performed, the mixture in the combustion chamber can be homogenized by the dispersing action of the adapter.

2 intake pipe, 6 intake valve, 10 valve body (supply body), 40 valve body, 60, 260, 360, 460, 560, 660, 760, 860, 960, 1060, 1160, 1260, 1360 Hole forming member), 1460, 1560, 1660 adapter (hole forming member) 60a, 260a, 460a, 1260a nozzle hole, 62, 362, 460, 562, 662, 762, 1162 peripheral wall portion, 662a, 762a end face, 1264 side face , 1461, 1561, 1661 Injection hole forming part (bottom part) 70, 370, 470, 570, 670, 770, 870, 970, 1070, 1170, 1270, 1370 Suppression structure, 71, 371, 571, 771, 1171a, 1171b Air introduction hole, 71o, 371o, 571o Outlet opening (opening ), 372, 572, 772 guide, 674, 774 enlarged opening, 875, 975, 1075, 1375 inner circumferential guide wall, 875a, 975a, 1075a inner circumferential slope, 975c air pocket (concave), 1076 outer circumferential guiding wall, 1076a Peripheral slope, 1277 Second injection hole, 90 Fuel hose (extension member), 120 ECU (control unit) 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400 Fuel injector

Claims (20)

A fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine,
Injecting a gas fuel injection hole (60a, 260 a) is injection hole forming member which is at least one formation (60, 260, 6 60, 1 16 0) and,
A supply body (10) forming a fuel passage for supplying gaseous fuel to the nozzle hole;
A valve body (40) that discontinues inflow of gaseous fuel into the nozzle hole by being displaced with respect to the supply body;
It is located at a connection portion between the supply main body and the intake pipe, or an extension member (90) provided between the supply main body and the intake pipe to extend the fuel passage and the intake pipe, the jet for the gaseous fuel injected from the injection hole, provided with a mixing deterioration suppressing suppression structure of the gaseous fuel and air caused by contraction flow accompanying the jet itself (70, 6 70, 1 17 0), a,
The suppression structure is erected so as to surround the periphery of the nozzle hole, and a peripheral wall portion (62, 1162) that forms an air introduction hole (71, 1171a) for introducing air into the jet flow injected from the nozzle hole. Have
A plurality of the nozzle holes are formed in the nozzle hole forming member,
Said air introduction hole becomes the outlet side of the air in the opening (71o), the fuel injection device according to claim Rukoto directed between the jet ejected from two adjacent among the plurality of the injection holes. A fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine,
An injection hole forming member (360) having at least one injection hole (60a) for injecting gaseous fuel;
A supply body (10) forming a fuel passage for supplying gaseous fuel to the nozzle hole;
A valve body (40) that discontinues inflow of gaseous fuel into the nozzle hole by being displaced with respect to the supply body;
It is located at a connection portion between the supply main body and the intake pipe, or an extension member (90) provided between the supply main body and the intake pipe to extend the fuel passage and the intake pipe, About the jet of gaseous fuel injected from the nozzle hole, comprising a suppression structure (370) that suppresses deterioration of mixing of gaseous fuel and air caused by the contracted flow accompanying the jet itself,
The restraining structure (3 7 0) is provided so as to surround the periphery of the nozzle hole, and a peripheral wall portion that forms an air introduction hole (3 7 1) for introducing air into the jet flow injected from the nozzle hole (3 6 2), have a,
The nozzle hole forming member is formed with a plurality of the nozzle holes arranged in an annular shape,
The peripheral wall portion is
In the nozzle hole forming member, standing from the outer peripheral side of the plurality of nozzle holes,
By extending the air introduction hole to the inner peripheral side, a guide (372) that positions an opening (371o) on the air introduction hole between the two adjacent injection holes is formed as an air outlet side. ), fuel injection device you and forming a. Wherein the peripheral wall, the fuel injection device according to claim 1 or 2, characterized in that enlarged opening for expanding the air inlet holes to the end face of the upright direction of the peripheral wall portion is formed. A fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine,
An injection hole forming member (660) having at least one injection hole (60a) for injecting gaseous fuel;
A supply body (10) forming a fuel passage for supplying gaseous fuel to the nozzle hole;
A valve body (40) that discontinues inflow of gaseous fuel into the nozzle hole by being displaced with respect to the supply body;
It is located at a connection portion between the supply main body and the intake pipe, or an extension member (90) provided between the supply main body and the intake pipe to extend the fuel passage and the intake pipe, About the jet of gaseous fuel injected from the nozzle hole, comprising a suppression structure (670) that suppresses deterioration of mixing of gaseous fuel and air caused by the contracted flow accompanying the jet itself,
The restraining structure has a peripheral wall portion (662) that is erected so as to surround the periphery of the nozzle hole and forms an air introduction hole (671) that introduces air into the jet flow injected from the nozzle hole. ,
Wherein the peripheral wall portion, the end face of the upright direction of the peripheral wall portion (662a) to said air inlet holes enlarged opening to expand (674) is formed fuel injector said Rukoto. A fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine,
An injection hole forming member (460, 560, 760) having at least one injection hole (460a) for injecting gaseous fuel;
A supply body (10) forming a fuel passage for supplying gaseous fuel to the nozzle hole;
A valve body (40) that discontinues inflow of gaseous fuel into the nozzle hole by being displaced with respect to the supply body;
It is located at a connection portion between the supply main body and the intake pipe, or an extension member (90) provided between the supply main body and the intake pipe to extend the fuel passage and the intake pipe, A suppression structure (470, 570, 770) that suppresses the deterioration of mixing of gaseous fuel and air generated by the contracted flow accompanying the jet itself with respect to the jet of the gaseous fuel injected from the nozzle hole,
The suppression structure is,
The nozzle hole (460a) extending annularly so that the central angle is 180 ° or more;
Fuel injection device you comprising a circumferential wall portion (462,562,762) provided upright so as to surround the outer periphery of the injection hole.   The peripheral wall portion (562, 762) is formed with air introduction holes (571, 771) that penetrate the peripheral wall portion and introduce air into the inner peripheral side of the jet flow ejected from the nozzle hole. The fuel injection device according to claim 5. The peripheral wall (662, 762) is formed with an enlarged opening (674, 774) that expands the air introduction hole to end surfaces (662a, 762a) in the standing direction of the peripheral wall. Item 7. The fuel injection device according to Item 6 . A fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine,
An injection hole forming member (860, 960, 1060, 1160, 1360) having at least one injection hole (60a, 1260a) for injecting gaseous fuel;
A supply body (10) forming a fuel passage for supplying gaseous fuel to the nozzle hole;
A valve body (40) that discontinues inflow of gaseous fuel into the nozzle hole by being displaced with respect to the supply body;
It is located at a connection portion between the supply main body and the intake pipe, or an extension member (90) provided between the supply main body and the intake pipe to extend the fuel passage and the intake pipe, A suppression structure (870, 970, 1070, 1170, 1370) that suppresses the deterioration of mixing of gaseous fuel and air generated by the contracted flow accompanying the jet itself with respect to the jet of the gaseous fuel injected from the nozzle hole is provided. ,
The said injection hole forming member, a plurality of the injection holes arranged annularly formed,
The suppressing structure, the erected in the injection hole forming member from the inner circumferential side of the plurality of the injection holes, inner peripheral guide wall portion for guiding the jet ejected from each said nozzle hole (875,975,1075, 1375), fuel injection device further comprising a.   The inner peripheral guide wall portions (875, 975, 1375) form inner peripheral inclined surfaces (875a, 975a) that incline toward the outer peripheral side as they are separated from the nozzle holes, and each jet flow injected from the plurality of nozzle holes. The fuel injection device according to claim 8, wherein the fuel is guided to the outer peripheral side by the inner peripheral inclined surface.   10. The fuel according to claim 9, wherein the inner circumferential guide wall portion (975, 1375) forms a concave portion (975 c) that opens toward a moving direction of the jet on the inner circumferential side of the inner circumferential slope. Injection device. The restraint structure (1070) is erected so as to surround the outer peripheral side of the plurality of nozzle holes, and is guided to guide the jet flow to the outer peripheral side by an outer peripheral inclined surface (1076a) that inclines to the outer peripheral side as it is separated from the nozzle holes A wall (1076),
The said inner periphery guide wall part (1075) guides a jet flow to an inner peripheral side by the inner peripheral slope (1075a) which inclines to an inner peripheral side as it leaves | separates from the said nozzle hole. Fuel injection device.   The inner peripheral guide wall portions (1175, 1375) are formed with air introduction holes (1171b) that penetrate the inner peripheral guide wall portions and introduce air into the inner peripheral side of the jet flow ejected from the nozzle holes. The fuel injection device according to any one of claims 8 to 11, wherein the fuel injection device is used. Said suppressing structure (1 370), the stretching at the injection hole forming member (1 360) in the outer peripheral side from the first injection holes as the nozzle holes (1260a), opening on the side surface of the injection hole forming member The fuel injection device according to any one of claims 1 to 12, further comprising a second injection hole (1277). A fuel injection device for injecting gaseous fuel into an intake pipe (2) provided in an internal combustion engine,
An injection hole forming member (1260, 1360) having at least one injection hole for injecting gaseous fuel;
A supply body (10) forming a fuel passage for supplying gaseous fuel to the nozzle hole;
A valve body (40) that discontinues inflow of gaseous fuel into the nozzle hole by being displaced with respect to the supply body;
It is located at a connection portion between the supply main body and the intake pipe, or an extension member (90) provided between the supply main body and the intake pipe to extend the fuel passage and the intake pipe, A suppression structure (1270, 1370) that suppresses deterioration of mixing of gaseous fuel and air generated by the contracted flow accompanying the jet itself with respect to the jet of gaseous fuel injected from the nozzle hole,
The suppression structure extends from the first nozzle hole (1260a) as the nozzle hole to the outer peripheral side in the nozzle hole forming member, and opens to the side surface (1264) of the nozzle hole forming member. 1277) ., A fuel injection device characterized by things. The suppression structure is erected so as to surround the periphery of the injection hole, and wherein Rukoto that having a peripheral wall, which forms an air introducing hole for introducing air into the interior of the jet ejected from the nozzle hole The fuel injection device according to claim 14. A fuel injection device that receives a control signal from a control unit (120) of an internal combustion engine and injects gaseous fuel into an intake pipe (2) provided in the internal combustion engine,
A supply body (10) forming a fuel passage for supplying gaseous fuel to the intake pipe;
An extension member (90) provided between the supply body and the intake pipe to extend the fuel passage;
A valve body (40) whose displacement is controlled by the control signal by discontinuing the flow of gaseous fuel in the fuel passage by being displaced with respect to the supply body;
An injection hole forming member (1460, 1560, 1660) located at a connection portion between the extension member and the intake pipe and having at least one injection hole for dispersing gaseous fuel in the intake pipe;
Wherein when the internal combustion engine is in a transient operation state, wherein the injection of the gaseous fuel into the intake pipe, fuel injection device you characterized in that it is completed before opening of the intake valve of the internal combustion engine (6). The injection of gaseous fuel into the intake pipe is completed after the intake valve is opened and before the bottom dead center of the intake stroke when the internal combustion engine is in a steady operation state. 16. The fuel injection device according to 16. A fuel injection device that receives a control signal from a control unit (120) of an internal combustion engine and injects gaseous fuel into an intake pipe (2) provided in the internal combustion engine,
A supply body (10) forming a fuel passage for supplying gaseous fuel to the intake pipe;
An extension member (90) provided between the supply body and the intake pipe to extend the fuel passage;
A valve body (40) whose displacement is controlled by the control signal by discontinuing the flow of gaseous fuel in the fuel passage by being displaced with respect to the supply body;
An injection hole forming member (1460, 1560, 1660) located at a connection portion between the extension member and the intake pipe and having at least one injection hole for dispersing gaseous fuel in the intake pipe;
If the internal combustion engine is in a steady operating state, said injection of the gaseous fuel into the intake pipe, after opening of the intake valve of the internal combustion engine (6), and is completed before bottom dead center of the intake stroke Rukoto fuel injection device it said.   19. When the internal combustion engine is in a steady operation state, the injection of gaseous fuel into the intake pipe is started after the intake valve is opened. Fuel injection device.   The nozzle hole forming member is formed in a bottomed cylindrical shape,
  The nozzle hole has a cylindrical hole shape formed in a bottom portion (1461, 1561, 1661) of the nozzle hole forming member and extending in a direction inclined with respect to a central axis along the axial direction of the nozzle hole forming member. The fuel injection device according to claim 16, wherein the fuel injection device is a fuel injection device.

Images