WO2018066168A1

WO2018066168A1 - Fuel injection device

Info

Publication number: WO2018066168A1
Application number: PCT/JP2017/019875
Authority: WO
Inventors: 宏水井; 磨三浦; 雅之大工原; 円城寺　直之
Original assignee: 株式会社ミクニ
Priority date: 2016-10-07
Filing date: 2017-05-29
Publication date: 2018-04-12
Also published as: JP6817773B2; CN110312863A; JP2018059483A

Abstract

[Problem] To provide a fuel injection device suitable for miniaturizing an internal combustion engine, and also suitable for supplying fuel to a combustion chamber. [Solution] The present invention relates to a fuel injection device 10 provided with: a main body part 20 which forms a passage portion 24 serving as a portion of an intake passage of an internal combustion engine; and an injector 22 disposed in the main body part. The main body part 20 is provided with a first wall part 40 extending out from the passage portion 24. The first wall part 40 is shaped to support the injector so that the tip part of the injector faces the outside of an outlet opening 24b of the passage portion. The main body part 20 is formed such that, in a second direction different from a first direction in which the first wall part extends out from the passage portion, a first passage portion 46 partially formed by the first wall part has an expanded cross-sectional shape compared to the cross-sectional shape of the inlet opening 24a of the passage portion.

Description

Fuel injection device

The present invention relates to a fuel injection device for injecting fuel into an intake passage of an internal combustion engine.

Conventionally, an internal combustion engine in which an injector (fuel injection valve) is arranged so as to inject fuel into an intake passage has been widely used, and various further improvements to such an internal combustion engine have been proposed. For example, in Patent Document 1, a single throttle intake passage is disposed upstream of an intake distribution passage that distributes intake air to a plurality of cylinders, and an injector is provided to inject fuel into the intake air that has passed through the throttle valve in the throttle intake passage. An internal combustion engine is disclosed. In this internal combustion engine, the throttle body is provided with a throttle valve and an injector.

Japanese Patent No. 4686493

By the way, in recent years, there has been an increasing demand for downsizing of internal combustion engines in order to expand the interior space of vehicles. In addition, the demand for exhaust gas purification has increased further in recent years.

However, according to the description in Patent Document 1, in the internal combustion engine, the injector is attached in a posture close to a right angle to the intake passage so that the liquid fuel collides with the inner peripheral surface (the wall surface of the throttle body) of the outlet of the throttle intake passage. It has been. Therefore, it is difficult to make the injector around compact, and the technique of Patent Document 1 has a problem in terms of downsizing the internal combustion engine. Further, in the internal combustion engine, since the fuel supplied from the injector adheres to the wall surface of the throttle body, there is a problem in suitably supplying the fuel to the combustion chamber from the viewpoint of fuel consumption and exhaust emission.

The present invention has been made in view of the above matters, and an object thereof is to provide an apparatus suitable for downsizing an internal combustion engine and excellent in supplying fuel to a combustion chamber.

According to one aspect of the invention,
A fuel injection device comprising: a main body part that forms a passage portion that becomes a part of an intake passage of an internal combustion engine; and an injector disposed in the main body part,
The main body is
A first wall extending so as to overhang the passage portion, the first wall supporting the injector to direct the tip of the injector to the outside of the outlet opening of the passage portion Comprising a first wall shaped to
In a second direction different from the first direction in which the first wall portion protrudes from the passage portion, the first passage portion partially formed by the first wall portion is an inlet opening of the passage portion. The main body is formed so as to have an expanded cross-sectional shape compared to the cross-sectional shape.
A fuel injection device is provided.

Preferably, the main body portion is formed so that the first passage portion has an expanded cross-sectional shape in a direction substantially orthogonal to the first direction as compared to the cross-sectional shape of the inlet opening. Yes.

Preferably, the main body includes a second wall portion that is positioned vertically below the passage portion when the internal combustion engine is provided with the fuel injection device, and that partially forms the first passage portion. The second wall portion is shaped to avoid accumulation of fuel in the first passage portion.

Preferably, in the horizontal direction determined when the fuel injection device is provided in the internal combustion engine, the first passage portion has an expanded cross-sectional shape as compared with the cross-sectional shape of the inlet opening. The main body is formed.

The fuel injection device may further include an intake throttle valve on the upstream side of the first passage portion.

Preferably, the main body portion includes a first main body portion in which the tip portion of the injector is positioned, and a second main body portion positioned on the upstream side of the first main body portion. In this case, the injector may be fixed to the main body by assembling the second main body to the first main body.

Preferably, the fuel injection device further includes an intake throttle valve, and the intake throttle valve is provided upstream of the first main body. When the main body portion further includes a third main body portion positioned on the upstream side of the second main body portion, the intake throttle valve may be provided on the third main body portion.

Preferably, a fuel passage to the injector is formed in the second main body portion.

According to the above aspect of the present invention, since the above-described configuration is provided, the injector can be disposed with a large offset in the intake passage. With this arrangement, in the fuel injection device according to the above aspect, the fuel can be injected from the injector toward the intake passage on the downstream side of the fuel injection device, and thus the fuel can be suitably supplied to the combustion chamber. Further, due to the arrangement of the injectors, the amount of projection of the injectors from the main body can be reduced, and the overall size of the fuel injection device can be reduced.

1 is a block diagram of an intake system of an internal combustion engine to which a fuel injection device according to an embodiment of the present invention is applied. It is a perspective view of the fuel-injection apparatus based on one Embodiment of this invention applied to the internal combustion engine of FIG. FIG. 3 is an exploded perspective view of the fuel injection device of FIG. 2. It is the figure which looked at the fuel-injection apparatus of FIG. 2 from the downstream. It is the figure which looked at the fuel-injection apparatus of FIG. 2 from the upstream. It is a side view of the fuel-injection apparatus of FIG. FIG. 5 is a partial cross-sectional view of the fuel injection device of FIG. 2 along the line VII-VII of FIG. It is a perspective view from the upstream of the downstream main-body part of the main-body parts of the fuel-injection apparatus of FIG. FIG. 5 is a perspective view of one of the main body portions of the fuel injection device of FIG. 2 divided along the line IX-IX in FIG. 4. It is the figure which looked at the upstream main-body part among the main-body parts of the fuel-injection apparatus of FIG. 2 from the downstream. It is a figure for demonstrating the change of the cross-sectional shape of the channel | path part of the fuel-injection apparatus of FIG. It is a figure for demonstrating the fuel injection in the fuel-injection apparatus of FIG. FIG. 6 is a block diagram of an intake system of an internal combustion engine to which a fuel injection device according to another embodiment of the present invention is applied.

Hereinafter, the present invention will be described based on embodiments. FIG. 1 is a block diagram of an intake system of an internal combustion engine (engine) to which a fuel injection device 10 according to an embodiment of the present invention is applied. As shown in FIG. 1, the fuel injection device 10 is disposed between the air cleaner 12 and the intake port 14. More specifically, the fuel injection device 10 is attached to a cylinder head of an engine main body (not shown) in which the intake port 14 is formed, in contact with the downstream end thereof via a gasket (not shown) as a seal member. The fuel injection system 10 is connected to a fuel supply system, and fuel is pumped from the fuel pump 16. In FIG. 1, the solid line arrows indicate the flow of fuel, and the broken line arrows indicate the flow of intake air.

The fuel injection device 10 is shown in FIGS. 2 and 4 to 6. FIG. 3 is an exploded perspective view of the fuel injection device 10. FIG. 7 is a partial cross-sectional view of the fuel injection device 10. The illustrated fuel injection device 10 includes a main body 20 and an injector 22 (reference numeral “INJ” in FIG. 1).

In the fuel injection device 10, the main body portion 20 forms a passage portion 24 that becomes a part of the intake passage of the internal combustion engine. The passage portion 24 extends in the longitudinal direction LA of the main body 20 and has an inlet opening 24a located at the upstream end and an outlet opening 24b located at the downstream end. Therefore, the longitudinal direction LA substantially corresponds to the flow direction of fluid such as intake air.

In the fuel injection device 10, when the surface along the line VII-VII in FIG. 4 is defined as the virtual plane PL, the passage portion 24 is approximately divided into two by the plane PL. Then, the center of the cross section of the passage portion 24 on an arbitrary plane (this plane is also orthogonal to the virtual plane PL) determined to be orthogonal to the longitudinal direction is substantially located on the virtual plane PL.

As is clear from FIG. 7, the injector 22 is disposed on the main body 20 so that the axis (injector axis) 22 c of the injector 22 extends on the virtual plane PL. The fuel injection device 10 according to the present embodiment is configured such that the injector 22 is positioned at a location vertically above the passage portion 24 of the fuel injection device 10 when provided in the intake system of the internal combustion engine. Therefore, when the fuel injection device 10 is provided in the internal combustion engine, the virtual plane PL extends substantially parallel to the vertical direction. However, when referring to the position and direction, the term “internal combustion engine” refers to an internal combustion engine in a used state, for example, mounted on a vehicle. The injector 22 is controlled by a control device (not shown) (for example, mounted in a vehicle) in the same manner as a conventionally known injector. In addition, illustration of electrical connection parts, such as the injector 22, is simplified.

The main body 20 is divided into a downstream main body (first main body) 26 (symbol “B1” in FIG. 1) and an upstream main body (second main body) 28 (symbol “B2” in FIG. 1). Has been. An upstream main body portion 28 is positioned on the upstream side of the downstream main body portion 26. As is clear from FIGS. 2 to 6, the downstream main body 26 and the upstream main body 28 are arranged in the longitudinal direction LA and connected by mechanical connection means (not shown). Accordingly, the passage portion 24 has a portion formed by the downstream body portion 26 and a portion formed by the upstream body portion 28. In addition, when the downstream main body portion 26 and the upstream main body portion 28 are assembled, a gasket (not shown) is disposed as a seal member therebetween.

In the fuel injection device 10, for example, as shown in FIGS. 3 and 8, an injector insertion portion 30 is provided in the downstream main body portion 26. The injector insertion portion 30 is configured to open to the passage portion 24 on the downstream side (back side) and to support the injector 22 at a predetermined angle with respect to the passage portion 24. As shown in FIG. 7, the injector insertion part 30 has a substantially straight insertion hole as a whole. The injector 22 is inserted from the outer opening of the insertion hole until the body of the injector 22 hits the corresponding wall surface of the injector insertion portion 30. However, in FIG. 7, the injector 22 is shown more simply than in FIG. The downstream main body 26 is provided with an intake pipe internal pressure sampling pipe 31 for an intake pressure sensor.

As shown in FIGS. 3 and 10, for example, an injector holding portion 32 is provided in the upstream main body portion 28. The injector holding portion 32 forms a fuel passage 38 and is formed so as to penetrate therethrough. The fuel passage 38 communicates with the fuel intake port 36 of the upstream main body 28 into which the fuel supply pipe 37 is press-fitted, and can guide the fuel pumped from the fuel pump 16 to the injector 22. The upstream main body 28 is attached to the downstream main body 26 while the front end side (including the front end 22a) of the injector 22 is inserted into the injector insertion section 30 of the downstream main body 26, so that the upstream main body The rear end portion 22 b of the injector 22 is fitted into the injector holding portion 32 of the portion 28. In this state, the injector body 22 is firmly fixed to the main body portion 20 by the upstream main body portion 28 being integrally fixed to the downstream main body portion 26 by mechanical connection means (not shown). As shown in FIG. 7, O-rings R1 and R2 are attached to the front end portion 22a and the rear end portion 22b of the injector, respectively.

Further, a throttle valve (intake throttle valve) 34 is provided in the upstream main body 28. That is, the throttle valve 34 is provided on the upstream side of the tip 22a (that is, the fuel injection port) of the injector 22. In other words, the injector 22 is disposed in the main body 20 so as to inject fuel into the intake passage on the downstream side of the throttle valve 34. In the present embodiment, the throttle valve 34 is an electronically controlled valve, and is configured to be electronically controlled using a throttle actuator 35. In the vehicle, the throttle actuator 35 can be controlled by the control device so that the opening degree of the throttle valve 34 is electrically controlled in accordance with the depression amount of the accelerator pedal operated by the driver. Here, the throttle valve 34 is a butterfly valve. The valve body 34a of the throttle valve 34 has a substantially circular shape, and as is apparent from FIGS. 5 and 7, the cross section of the passage portion around the throttle valve 34 and the inlet opening 24a have the same shape and are substantially circular. The cross-sectional shape of the inlet opening 24a corresponds to the cross-sectional shape of a passage formed by an intake system member (for example, an air cleaner or an intake pipe) connected to the upstream side of the fuel injection device 10. When the fuel injection device 10 of the present embodiment is provided in the intake system of the internal combustion engine, the throttle valve 34 is arranged so that the throttle shaft 34b of the throttle valve 34 extends in a substantially horizontal direction (a direction substantially perpendicular to the vertical direction). The fuel injection device 10 is provided. Since the valve body 34a of the throttle valve 34 is provided in the upstream main body 28 of the main body 20 as described above, the main body 20 may be referred to as a throttle body.

In the fuel injection device 10, the injector 22 is attached to the passage portion 24 at a predetermined angle as described above. In the present embodiment, as described above, the passage portion 24 (that is, the longitudinal direction LA) is formed on the plane 22c so that the axis 22c of the injector 22 extends on the virtual plane PL that is the plane along the line VII-VII in FIG. The injector 22 is mounted at a predetermined angle with respect to. In particular, in the fuel injection device 10, as shown in FIG. 7, the tip end portion 22 a of the injector 22, that is, the axis 22 c thereof (not directly facing the wall portion forming the passage portion 24), the outlet opening of the passage portion 24. The injector 22 is angled so as to directly penetrate the portion 24b and face the outside thereof.

In order to enable such an arrangement of the injector 22, the injector 22 is attached in a state of being largely offset toward the inside of the passage portion 24. The injector insertion portion 30 of the downstream body portion 26 and the injector holding portion 32 of the upstream body portion 28 are configured as such. In particular, the main body portion 20 has a wall portion 40 (hereinafter referred to as “first wall portion”) extending so as to support the injector 22. The first wall portion 40 extends so as to partially also form the passage portion 24. That is, the first wall portion 40 extends to support the injector 22 and partially forms the passage portion 24. And the 1st wall part 40 is extended so that it may project to the channel | path part 24 so that it may respond | correspond to the attachment angle of the injector 22. FIG.

In the fuel injection device 10, the first wall portion 40 extends over the injector insertion portion 30 of the downstream body portion 26 and the injector holding portion 32 of the upstream body portion 28. That is, the first wall portion 40 includes the first downstream side wall portion 40 a of the downstream side main body portion 26 and the first upstream side wall portion 40 b of the upstream side main body portion 28.

More specifically, as is apparent from FIG. 9, the first wall portion 40 has a substantially semi-cylindrical shape so as to fit the substantially lower half of the injector 22 and support the injector 22, and face the passage portion 24. And is configured to be convexly curved. And the 1st wall part 40 is the downstream which forms the inner opening part of an insertion hole partially so that the said insertion hole of the injector insertion part 30 may open to the channel | path part 24 only in the inner opening part of the downstream edge part. It is designed with a side edge, that is, a tip edge 40c. In addition, the 1st wall part 40 is comprised so that the amount of protrusions may change in a longitudinal direction so that the amount of protrusion to the channel | path part 24 may increase toward the front-end | tip edge part 40c side.

Thus, by forming the first wall portion 40 so as to protrude from the passage portion 24, the passage portion 24 is affected by the first wall portion 40 in the direction in which the passage cross-sectional area decreases. However, it is necessary to keep the intake air flowing into a suitable combustion chamber in terms of the output of the internal combustion engine, fuel consumption, exhaust emission, and the like. Therefore, the fuel injection device 10 is particularly designed so that the main body portion 20 expands the passage portion 24 in a predetermined direction by an amount corresponding to the protrusion of the first wall portion 40 to the passage portion 24.

Here, the injector 22 is offset downward with respect to the passage portion 24 in the vertical direction determined when mounted on the internal combustion engine (in other words, the injector 22 is provided so as to enter the passage portion 24 from the upper side to the lower side). Is). Therefore, with the offset of the injector 22, the portion of the passage portion 24 where the first wall portion 40 protrudes in a direction substantially orthogonal to the direction in which the injector 22 is offset is compared to the inlet opening 24a. And expanded. As described above, the fuel injection device 10 is configured so that the injector 22 is positioned at a location vertically above the passage portion 24 when the fuel injection device 10 is provided in the intake system of the internal combustion engine. Therefore, the expansion of the first wall portion 40 of the passage portion 24 mainly extends in the horizontal direction determined when the fuel injection device 10 is provided in the internal combustion engine due to the expansion in the substantially orthogonal direction at this time. Expand.

And the lower side wall part of the wall part which forms the channel | path part 24 is avoided so that the fuel injected from the injector 24 may collect in the channel | path part 24 of the fuel-injection apparatus 10 (for example, when adhering to a wall surface). Is designed not to be recessed by the above expansion. The lower side wall portion refers to a wall portion that is positioned below the passage portion 24 in the vertical direction when the fuel injection device 10 is provided in the intake system of the internal combustion engine. The lower side wall portion includes a wall portion (hereinafter referred to as “second wall portion”) that forms an intermediate passage portion 46 described later together with the first wall portion 40.

Here, the cross-sectional shape of the passage portion 24 and its change will be described.

The passage portion 24 of the fuel injection device 10 can be divided into a plurality of portions from the upstream side toward the downstream side. The upstream passage portion 44 located on the most upstream side is provided with the throttle valve 34 and has a substantially circular cross section. The upstream passage portion 44 includes an inlet opening 24a.

An intermediate passage portion 46 is provided downstream of the upstream passage portion 44 so as to be continuous therewith. As described above, the intermediate passage portion 46 has a cross-sectional shape (in a virtual plane orthogonal to the longitudinal direction) that is different from that of the upstream-side passage portion 44 because the first wall portion 40 protrudes from the passage portion 24. Part. The cross-sectional shape of the intermediate passage portion 46 is recessed around the first wall portion due to the overhang of the first wall portion 40, and the cross-sectional integral corresponding to the recessed portion or more is greater than the cross-sectional shape of the upstream passage portion 44. It is determined to expand in a substantially horizontal direction (including the horizontal direction). In the fuel injection device 10, as can be understood from FIG. 7 and FIG. 9, the overhang amount by the first wall portion 40 increases from the upstream side to the downstream side (as it approaches the leading edge 40 c). The amount of expansion in the horizontal direction is substantially constant from the upstream side to the downstream side. Therefore, the intermediate passage portion 46 is narrowest at the tip edge portion 40c. In order to ensure a smooth flow of fluid, that is, intake air, the intermediate passage portion 46 is located at the tip edge portion 40c of the intake passage area when the throttle valve 34 is fully opened (from the cross-sectional area of the inlet opening 24a to the throttle shaft 34b). The main body 20 is formed so as to have a cross-sectional area equal to or larger than the area obtained by subtracting the projected area of the screw for mounting the screw. Thus, the intermediate passage portion 46 has a non-circular cross-sectional shape for the overhang of the first wall portion and the expansion in the predetermined direction.

In particular, in the present embodiment, as described above, the injector 22 is positioned at a position above the passage portion 24 in the vertical direction when the internal combustion engine is provided, and the axis 22c of the injector extends on the virtual plane PL. Thus, the fuel injection device 10 is designed. Therefore, as can be understood from FIGS. 4 and 10, the passage portion 24 is formed such that the intermediate passage portion 46 extends in a direction perpendicular to the virtual plane PL with respect to the upstream passage portion 44.

Thus, although the intermediate passage portion 46 expands, the lower side wall portion located below the passage portion 24 in the vertical direction when the fuel injection device 10 is disposed in the internal combustion engine is the lower side in the vertical direction as described above. It is designed not to extend. More specifically, the second wall portion 47 facing the first wall portion extending so as to support the injector 22 in the lower side wall portion is a wall surface of the wall portion forming the upstream passage portion 44. Designed to have a wall extending over the extension. Since the first wall portion 40 includes the first downstream side wall portion 40a of the downstream main body portion 26 and the first upstream side wall portion 40b of the upstream main body portion 28, the second wall portion 47 is also separated from the downstream main body portion 26. It extends over the upstream main body 28.

The intermediate passage portion 46 corresponds to the first passage portion of the present invention. The intermediate passage portion 46 extends from the downstream main body portion 26 to the upstream main body portion 28 in the fuel injection device 10. This corresponds to the fact that the first wall portion 40 includes the first downstream side wall portion 40a of the downstream side main body portion 26 and the first upstream side wall portion 40b of the upstream side main body portion 28.

Further, a downstream passage portion 48 is provided downstream of the intermediate passage portion 46 so as to be continuous therewith. The downstream passage portion 48 is a part of the passage portion 24, and is a portion of the passage portion 24 on the downstream side from the distal end edge portion 40 c of the first wall portion 40. Since the first wall 40 is no longer present, the downstream passage portion 48 is designed so that the cross-section changes in the direction in which the horizontal extent is now reduced with respect to the intermediate passage portion 46. .

Here, the cross-sectional shape CS1 of the inlet opening 24a in the upstream-side passage portion 44 and the cross-sectional shape CS2 of the intermediate-passage portion 46 (in FIG. 11, at the connection point between the upstream body portion 28 and the downstream body portion 26). 11 is overlapped with the sectional shape CS3 of the outlet opening 24b in the downstream passage portion 48. These cross-sectional shapes CS1, CS2, and CS3 are cross-sectional shapes on corresponding virtual planes that are orthogonal to the longitudinal direction. In FIG. 11, only the outline when those cross-sectional shapes are projected on a predetermined plane along the longitudinal direction LA is shown. From FIG. 11, the intermediate passage portion 46 of the passage portion 24 is located upstream in the second direction D2, which is a direction orthogonal to the first direction D1, due to the overhang of the first wall portion 40 in the first direction D1. It is clear that the cross-sectional shape of the passage portion 44 (eg, the inlet opening 24a) and the downstream passage portion 48 (eg, the outlet opening 24b) has an expanded cross-sectional shape. In the present embodiment, when the fuel injection device 10 is provided in an internal combustion engine, the first direction D1 is a direction including a component below the vertical direction, and the second direction D2 is a horizontal direction.

According to the fuel injection device 10 having the above configuration, the following effects are achieved.

First, in the fuel injection device 10, as described above, the injector 22 is attached with a large offset toward the inside of the passage portion 24. And the front-end | tip part 22a of the injector 22 is orient | assigned to the outer side of the exit opening part 24b. Therefore, the injector can be arranged in a state where the amount of projection of the injector 22 from the main body portion 20 to the outside is small. Therefore, the size of the entire fuel injection device 10 can be reduced, thereby contributing to the downsizing of the internal combustion engine.

Furthermore, in the fuel injection device 10, the injector 22 is arranged with the front end 22 a facing the outside of the outlet opening 24 b, in other words, with the passage portion 24 being largely laid down. Therefore, as schematically shown in FIG. 12, the fuel F can be injected directly from the injector 22 into the intake port 14 (for example, the back side thereof). Further, in the fuel injection device 10, the passage cross-sectional area of the passage portion 24 is maintained over its entire length over the intake passage area when the throttle valve 34 is fully opened, so that a smooth flow of intake air is suitably maintained. Can do. Therefore, it is possible to suitably introduce the fuel into the combustion chamber of the internal combustion engine and burn it. Therefore, by using the fuel injection device 10, it is possible to improve fuel consumption, exhaust emission, and the like.

The fuel injection device 10 is configured not only to inject fuel directly into the intake port 14 on the downstream side thereof, but also to inject fuel directly toward the intake valve 14 a that opens and closes the intake port 14 or in the vicinity thereof. Also good. The mounting angle of the injector 22, that is, the predetermined angle may be set to, for example, 45 ° or less, preferably 30 ° or less with respect to the longitudinal direction in a cross-sectional view or virtual plane PL as shown in FIG. Depending on the configuration, the angle may be set substantially parallel to the longitudinal direction.

Further, as described above, the injector 22 is attached so as to be sandwiched between the downstream main body portion 26 and the upstream main body portion 28. Therefore, a member (for example, a pipe member or a cap member) that is conventionally required to connect the fuel supply system to the injector 22 can be integrated into the main body. Therefore, it is possible to reduce the number of parts, thereby reducing costs.

As mentioned above, although this invention was demonstrated based on one Embodiment, a various change is possible. For example, in the fuel injection device 10, the main body 20 is divided into two, but may be divided into three or more. In FIG. 13, the structure of the fuel-injection apparatus 110 of another embodiment based on this invention is shown. Note that the arrows in FIG. 13 indicate the flow of fuel and intake air, as in FIG. In the fuel injection device 110, the main body 120 includes the above-described downstream main body 26 (B1) as the first main body, the intermediate main body 128a (B2) as the second main body, and the third main body. It is divided into an upstream main body 128b (B3). A throttle valve 34 (THV) is provided in the upstream main body 128b. A first wall portion as described above is formed from the middle of the intermediate body portion 128a to the downstream body portion 26. That is, the cross-sectional shape of the upstream opening of the intermediate main body portion 128a is substantially the same as the cross-sectional shape of the passage portion of the upstream main body portion 128b. The upstream main body 128 b provided with the throttle valve 34 may be removed from the fuel injection device 110. In this case, the upstream opening of the intermediate main body 128a becomes the inlet opening of the passage portion formed by the main body. Thus, the present invention allows the configuration of the fuel injection device not to include a throttle valve.

Further, in the

fuel injection devices

10 and 110, the injector is disposed at a location above the passage portion in the vertical direction, but the injector may be disposed at various locations such as a position shifted from the location in the vertical direction. Also in this case, the passage portion partially formed by the first wall portion of the main body portion has a direction in which the first wall portion projects with respect to the upstream passage portion regardless of the attachment position of the injector. It can be designed to spread in different directions. That is, the first direction in which the first wall portion projects from the passage portion is not limited to the direction including the component below the vertical direction, and the second direction that is different from the first direction is the horizontal direction. It is not limited to. However, since the passage portion may have a cross-sectional shape that is crushed due to the overhang of the first wall portion, the second direction may be a direction substantially orthogonal to the first direction. However, the expansion can be limited to the horizontal direction determined when the fuel injection device is provided in the internal combustion engine from the viewpoint of avoiding the retention of the fuel.

The

fuel injection devices

10 and 110 may be provided for each cylinder of the internal combustion engine having a plurality of cylinders. Further, when each of the plurality of injectors can be individually controlled, the plurality of fuel injection devices may be integrally configured. Further, the

fuel injection devices

10 and 110 may be used for a single intake port of one cylinder, but a plurality of intake valves may be provided in the intake port.

In the above embodiment, the throttle valve is an electronically controlled valve. However, this does not limit the drive system of the throttle valve. The drive system of the throttle valve may be a mechanical system, for example, a mechanical governor system or a cable system. In the present invention, the shape of the valve body of the throttle valve, the opening / closing direction, the direction of the throttle shaft, and the like are not limited to the above embodiment, and various changes can be made. Furthermore, the throttle valve is not limited to being a butterfly valve, and may be a valve of another type.

As mentioned above, although typical embodiment of this invention and its modification were demonstrated, this invention is not limited to them, A various change is possible. Various substitutions and modifications may be made without departing from the spirit and scope of the invention as defined by the claims of this application.

10, 110

Fuel injection device

20, 120 Main body 22 Injector 26 Downstream main body (first main body)
28 Upstream body part (second body part)
34 Throttle valve (intake throttle valve)
128a Intermediate main body (second main body)
128b upstream main body (third main body)

Claims

A fuel injection device comprising: a main body part that forms a passage portion that becomes a part of an intake passage of an internal combustion engine; and an injector disposed in the main body part,
The main body is
A first wall extending so as to overhang the passage portion, the first wall supporting the injector to direct the tip of the injector to the outside of the outlet opening of the passage portion Comprising a first wall shaped to
In a second direction different from the first direction in which the first wall portion protrudes from the passage portion, the first passage portion partially formed by the first wall portion is an inlet opening of the passage portion. The main body is formed so as to have an expanded cross-sectional shape compared to the cross-sectional shape.
Fuel injection device.
In the direction substantially orthogonal to the first direction, the body portion is formed such that the first passage portion has an expanded cross-sectional shape as compared with the cross-sectional shape of the inlet opening.
The fuel injection device according to claim 1.
The main body is
A second wall portion that is positioned vertically below the passage portion when the fuel injection device is provided in the internal combustion engine and partially forms the first passage portion;
The second wall is shaped to avoid accumulation of fuel in the first passage portion;
The fuel injection device according to claim 1 or 2.
In the horizontal direction determined when the internal combustion engine is provided with the fuel injection device, the first passage portion has an expanded cross-sectional shape as compared with the cross-sectional shape of the inlet opening. Part is formed,
The fuel injection device according to any one of claims 1 to 3.
An intake throttle valve is further provided upstream of the first passage portion;
The fuel injection device according to any one of claims 1 to 4.
The main body is
A first main body portion on which the tip portion of the injector is positioned;
A second body portion positioned upstream of the first body portion,
By assembling the second main body part to the first main body part, the injector is fixed to the main body part.
The fuel injection device according to any one of claims 1 to 5.
An intake throttle valve,
The intake throttle valve is provided upstream of the first main body.
The fuel injection device according to claim 6.
The main body further includes a third main body positioned on the upstream side of the second main body,
The intake throttle valve is provided in the third main body.
The fuel injection device according to claim 7.
A fuel passage to the injector is formed in the second body portion.
The fuel injection device according to any one of claims 6 to 8.