JPH07247924A - Fuel injection device - Google Patents

Abstract

PURPOSE:To provide a fuel injection device furnished with an inlet passage, an air chamber and an inlet control passage inexpensively and to improve lubricating function by fuel for a shaft arranged in the inlet control passage. CONSTITUTION:This device is formed divided by a chamber part 1 and an inlet pipe part 7. The chamber part 1 opens 2A toward an inlet pipe installing flange 5 and an inlet control passage 6 opens toward upward on a side wall 4. An installation flange 8 is formed on one side of the inlet pipe part 7 and an installation flange 9 is formed on the other side, and a plural number of inlet passages are provided. An air chamber 11 is formed by connecting the installation flange 8 and the inlet pipe installation flange 5 to each other and blocking the opening 2A. The inlet control passage 6 is controlled to open and close by a throttle valve 83, a fuel injection valve is arranged in the chamber part 1, and fuel injected by a fuel injection valve is injected to the inside of the corresponding inlet passage 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies air controlled by a throttle valve to an engine via an intake passage, and also supplies fuel controlled by a fuel injection valve toward air flowing in the intake passage. Fuel injection device.

[0002]

2. Description of the Related Art A conventional fuel injection device is shown in FIG. Referring to the drawings, the fuel injection device includes an intake pipe 60, an air chamber chamber 70, and an intake control pipe 80.
The air chamber 70 has a closed shape in which an opening 70B is formed in an upper side wall 70A in the drawing, and an intake control pipe 80 is connected to the opening 70B through a connecting pipe 71. An intake control passage 81 is bored through the intake control pipe 80, and the opening area of the intake control passage 81 is a shaft 82 rotatably supported by the intake control pipe 80.
It is controlled by the throttle valve 83 attached to the. On the other hand, a plurality of intake passages 60A are formed in the intake pipe 60, one end of the intake passage 60A is opened to the air chamber 70, and the other end is opened toward the engine E. In addition, J is a fuel injection valve which opens in each intake passage 60A of the intake pipe 60.

The throttle valve 83 is opened / closed by a driver, and the air flowing in the intake control passage 81 controlled by the throttle valve 83 flows into the air chamber 70 through the connecting pipe 71, and the air chamber The air in the chamber 70 is supplied to the engine E via the intake passages 60A of the intake pipe 60. On the other hand, from the fuel injection valve J, appropriately controlled fuel is injected into each intake passage 60A, whereby the fuel is mixed with the air flowing through the intake passage 60A, and thus the mixture containing the fuel and the air is mixed. Qi is supplied to the engine E.

[0004]

According to such a conventional fuel injection device, the air chamber 70 has a closed chamber shape, and the air chamber 70 is provided with openings in a plurality of directions (opening 70B). And the intake passage 60A is opened) to the air chamber 7 including the intake pipe 60.
It was difficult to make 0. For example, in the die casting method using a metal material (aluminum alloy, zinc alloy, etc.) and the injection molding method using a synthetic resin material (nylon, etc.), there is an undercut portion in the air chamber chamber 70, and therefore, molding cannot be performed. In addition, in the casting method using the sand mold, it is possible to manufacture, but it takes a lot of time to manufacture each piece, and there is a difficulty in mass production. Further, in the air chamber 70, There is a problem that it is difficult to smooth the inner wall surface and the air flow is obstructed.

On the other hand, since the intake control pipe 80 and the air chamber chamber 70 are connected by the connecting pipe 71, the distance between the injection hole of the fuel injection valve J and the shaft 82 supporting the throttle valve 83 is increased, This is not preferable because it has a problem that the lubrication action of the shaft 82 due to the fuel is reduced and increases the number of parts and the number of assembling steps.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to inexpensively manufacture a fuel injection device including an intake passage, an air chamber chamber, an intake control pipe, and a shaft to which a throttle valve can be attached. The purpose is to improve lubrication by fuel.

[0007]

The object is to provide an intake control pipe having a throttle valve in the intake control passage, an air chamber chamber connected to the intake control passage downstream of the throttle valve, and one end of the air chamber. A plurality of intake passages that are open to the chamber and the other end of which is connected to the engine, and the air flowing in the intake control passage is controlled by a throttle valve to be supplied to the air chamber interior, In a fuel injection device that supplies fuel to an engine through a plurality of intake passages and injects fuel from a fuel injection valve into air flowing through the intake passages, the fuel injection device is divided into a chamber portion and an intake pipe portion, The chamber portion has a bottom on one side, a side wall extends from the bottom toward the intake pipe mounting flange on the other side, and a bottomed cylindrical chamber recess having an opening at the end of the side wall,
An intake control passage which is formed substantially orthogonal to the side wall and has a lower end opening to the side wall and an upper end opening to the atmosphere; and an intake pipe portion having a chamber side mounting flange formed at one end thereof, and the like. Along with forming a mounting flange on the engine side at one end, a plurality of intake passages with one end opening to the mounting flange on the chamber side and the other end opening to the mounting flange on the engine side are formed. By joining the intake pipe mounting flange of the chamber portion onto the mounting flange, the opening of the chamber recess is closed by the chamber side mounting flange of the intake pipe portion to form the air chamber chamber, and each intake passage of the intake pipe portion is formed. Is opened in the air chamber, and a throttle valve attached to the shaft is arranged in the intake control passage, and the chamber is connected to the air chamber through the air chamber. It is achieved by arranging the plurality of fuel injection valve for injecting fuel into the intake passage.

[0008]

The fuel injection device is formed by being divided into the chamber portion and the intake pipe portion, and the chamber recess formed in the chamber portion opens toward the other side and
The intake control passage is opened and formed substantially orthogonal to the side wall of the chamber recess, and in the intake pipe portion, the intake passage is opened and opened laterally. The intake pipe section does not have an undercut section,
It is possible to perform molding by die casting or injection molding. Further, the assembling may be performed by simply joining the intake pipe mounting flange of the chamber portion to the chamber side mounting flange of the intake pipe portion. Thus, the fuel injection device can be provided at low cost. Further, the shaft to which the throttle valve can be attached is arranged in the intake control passage which opens directly into the chamber recess, and the fuel injection valve is arranged in the air chamber portion, and the fuel is injected toward each intake passage through the air chamber chamber. Since the fuel is injected and supplied, the shaft can obtain good lubrication by the fuel injected from the fuel injection valve.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fuel injection device according to the present invention will be described below with reference to FIGS. 1, 2 and 3. 1 is a vertical sectional view thereof, FIG. 2 is a horizontal sectional view taken along line XX of FIG. 1, and FIG. 3 is a perspective view of a chamber portion. Reference numeral 1 is a chamber portion, which is formed by the following. 2 is one side (left side in the figure)
Is a bottomed cylindrical chamber recess having a side wall 4 extending from the bottom portion 3 toward the other side (right side in the figure) and having an opening 2A at the other side end, and a flat shape is provided on the outer peripheral portion of the opening 2A. An egg intake pipe mounting flange 5 is formed. or,
The intake control passage 6 is formed substantially perpendicular to the side wall 4 of the chamber recess 2.
Of the intake control passage 6 is directly opened, and the upper end of the intake control passage 6 is opened so as to project upward. Furthermore, the side wall 4 of the chamber recess 2 has a mounting seat surface 4 for mounting the fuel injection valve J.
A is formed, and a hole 4B that opens into the chamber recess 2 is formed in this mounting seat surface 4A. In this example, four fuel injection valves J are arranged, and therefore four mounting seat surfaces 4A and holes 4 are provided in the chamber recess 2.
B was formed.

When the chamber 1 is molded by die casting or injection molding using a synthetic resin material, the outer shape of the chamber 1 and the chamber recess 2 are formed by a movable mold and a fixed mold, and the intake control passage 6 is formed. Is performed by a movable core that moves vertically in FIG. The reason why these operations are performed is based on the structures of the chamber recess 2 and the intake control passage 6 described above, and there is no undercut portion for the movable, fixed, mold and movable core.

Reference numeral 7 denotes an intake pipe portion having the following structure. Reference numeral 8 denotes a chamber side mounting flange formed at one end (the left end in the drawing), and an engine side mounting flange 9 is formed at the other end (the right end in the drawing). A plurality of intake passages 10 are bored from the chamber-side mounting flange 8 toward the engine-side mounting flange 9. That is, one side of the intake passage 10 is opened to the intake pipe mounting flange 5, and the other side is opened to the engine side mounting flange 9. In the present embodiment, four intake passages 10 are provided in the vertical direction, but the number and arrangement of the intake passages 10 are appropriately designed according to the installed engine.

When the intake pipe portion 7 is formed by die casting or injection molding using a synthetic resin material, its outer shape is formed by a movable mold and a fixed mold, and the intake passage 10 is shown in the left-right direction in the drawing. It is performed by a movable core that moves to. This is done because there is no undercut portion for the movable, fixed, mold and movable core based on the structure of the intake pipe section 7 described above. Through the above steps, the chamber portion 1 and the intake pipe portion 7 were specially prepared.

The chamber portion 1 and the intake pipe portion 7 are assembled as follows. On the intake pipe mounting flange 5 of the chamber portion 1, the chamber side flange 8 of the intake pipe portion 7 is arranged, and in such a state, both flanges 5 and 8 are joined and integrated. This joint is screwed using screws,
Any joining method such as adhesion with an adhesive, flipping made of an elastic metal material, fitting with a hole and a locking projection may be used. According to the above, the opening 2A of the chamber portion 1 is closed by the mounting flange 8 on the chamber side of the intake pipe portion 7, whereby the chamber recess 2 is formed as an air chamber chamber 11 having a closed state. Then, one side (the left side in the drawing) of each intake passage 10 of the intake pipe portion 7 opens into the air chamber chamber 11, and the opening below the intake control passage 6 opens into the air chamber chamber 11.

The shaft 82 and the throttle valve 83 are arranged in the intake control passage 6, the fuel injection valve J is arranged on each mounting seat surface 4A of the chamber 1, and the injection hole of the fuel injection valve J (see FIG. (Not shown) is arranged to face the inside of the air chamber 11 through the hole 4B. The shaft 82, the throttle valve 83, and the fuel injection valve J may be assembled either when the chamber 1 is used alone or after they are assembled.

According to the fuel injection device assembled as described above, the amount of the air flowing in the intake control passage 6 is controlled by the throttle valve 83 to flow into the air chamber chamber 11, and the inside of the air chamber chamber 11 is controlled. The air of each intake passage 10
The fuel that is split by the fuel injection valve J is injected into the air chambers 11 facing the respective intake passages 10, and the fuel is injected from the air chambers 11 into the respective intake passages 10. It is injected and supplied toward the air flowing through the engine, thus satisfying the operation of the engine.

[0016]

According to the fuel injection device of the present invention as described above, the following special effects are obtained. Since the chamber part and the intake pipe part do not have an undercut part when manufacturing a die and a core used at the time of die casting and injection molding, they can be manufactured by die casting and injection molding. What is possible is that these can be manufactured extremely easily and efficiently, and the manufacturing cost can be greatly reduced. The chamber portion and the intake pipe portion may be simply joined by stacking the flanges facing each other and joining them, and further, the joining can be performed very easily by using a generally-used joining method. Since the intake pipe mounting flange of the chamber portion and the chamber side flange of the intake pipe portion may be joined once, the assembly cost can be reduced, and the fuel injection device can be used together with the reduction of the manufacturing cost. It can be provided at a low cost. Since the shaft is directly arranged in the intake control passage which is directly arranged in the chamber portion without any connecting pipe, the shaft can be arranged in the vicinity of the air chamber chamber. Further, since the fuel injection valve is arranged in the chamber portion and the fuel injected from the fuel injection valve is injected into the air chamber chamber, the shaft injected by the fuel injected from the fuel injection valve is efficiently lubricated. The rotatability of the shaft can be maintained stably over a long period of time. In particular, it is suitable for a fuel injection device mounted on an outboard engine used at sea and used at sea when air containing salt flows down in the intake control passage.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a fuel injection device according to the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

FIG. 3 is a perspective view of a chamber portion of the present invention.

FIG. 4 is a vertical cross-sectional view of a conventional fuel injection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 chamber part 2 chamber recess 2A opening of chamber recess 3 bottom 4 sidewall 5 intake pipe mounting flange 6 intake control passage 7 intake pipe part 8 chamber side mounting flange 9 engine side mounting flange 10 intake passage 11 air chamber chamber 82 shaft 83 Throttle valve J Fuel injection valve

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area F02M 69/04 P F02M 35/10 301 P 301 R 69/00 350 P

Claims (1)

[Claims] 1. An intake control pipe having a throttle valve in the intake control passage, an air chamber connected to an intake control passage downstream of the throttle valve, one end of which opens to the air chamber and the other end of which opens. And a plurality of intake passages connected to the engine,
The air that flows in the intake control passage is controlled by the throttle valve to be supplied into the air chamber chamber, and the air in the air chamber chamber is supplied to the engine through a plurality of intake passages and the air flowing through the intake passage to the fuel injection valve. In the fuel injection device for injecting more fuel, the fuel injection device is divided into the chamber portion 1 and the intake pipe portion 7, and the chamber portion 1 includes
A bottomed cylindrical chamber recess 2 having a bottom portion 3 on one side, a side wall extending toward the intake pipe mounting flange 5 on the other side from the bottom portion 3, and an opening 2A at an end portion of the side wall, and a side wall. And an intake control passage whose lower end opens to the side wall and whose upper end opens to the atmosphere. The intake pipe section 7 has a chamber side mounting flange 8 formed at one end thereof. An engine-side mounting flange 9 is formed at the other end, and one end of the chamber-side mounting flange 8 is formed.
A plurality of intake passages 10 are opened, and the other end is opened to a mounting flange 9 on the engine side, and the intake pipe mounting flange 5 of the chamber portion 1 is joined to the chamber side mounting flange 8 of the intake pipe portion 7. The chamber recess 2
2A is closed by a mounting flange 8 on the chamber side of the intake pipe portion 7 to form an air chamber chamber 11, and each intake passage 10 of the intake pipe portion 7 is connected to the air chamber chamber 11
A plurality of fuel injection valves that are open to the inside and that have a throttle valve 83 attached to a shaft 82 in the intake control passage 6 and inject fuel into each intake passage through the air chamber chamber in the chamber portion. A fuel injection device characterized in that.