JPH07243359A - Fuel injection device - Google Patents

Abstract

PURPOSE:To realize a fuel injection device furnished with an air intake passage, an air chamber and an air intake control passage inexpensively and to improve lubricating work of a valve stem arranged in the air intake control passage by fuel. CONSTITUTION:This device is divided into a chamber part 1 and an air intake control pipe part 8. The chamber part 1 has a chamber recessed part 2 to open 2A toward an upward air intake control pipe installation flange 5 from a bottom part 3 and a plural number of air intake passages 6 to open to an installation flange 7 on the side of an engine on a side wall. The air intake control pipe part 8 has an air intake control passage 10 the one end of which opens to a flange 9 and the other end of which opens to the outside air. The opening 2A of the chamber part 1 is blocked by the flange on the side of the chamber part 1 of the air intake control pipe part and forms an air chamber 11. The air intake control passage 10 is controlled to open and close by a throttle valve 83 installed on a valve stem 82, and a fuel injection valve opens to the air intake passages 6.

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 via a connecting pipe 71. . An intake control passage 81 is formed so as to penetrate through the intake control pipe 80.
The opening area of is controlled by a throttle valve 83 attached to a shaft 82 rotatably supported by an intake control pipe 80. 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 (the openings 70B and 70B). (The intake passage 60A is opened) to the air chamber 70 including the intake pipe 60
Was difficult to make. For example, die casting using metal materials (aluminum alloy, zinc alloy, etc.),
The injection molding method using a synthetic resin material (nylon, etc.) cannot be molded due to the undercut portion in the air chamber 70, and can be manufactured by the casting method using the sand mold. In addition, it takes a lot of time to manufacture each piece, which is difficult to mass-produce. Furthermore, it is difficult to smooth the inner wall surface of the air chamber 70, which hinders the air flow. A problem arises.

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 causes a problem that the lubricating action of the shaft 82 due to the fuel is reduced, and the number of parts and the number of assembling steps increase.

[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 pipe, an air chamber chamber, and an intake control pipe, and to use a fuel for a shaft to which a throttle valve can be attached. The purpose is to improve the lubrication action by

[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 through the intake control passage is controlled by a throttle valve to be supplied to the air chamber chamber to supply a plurality of air chambers. In the fuel injection device that supplies fuel to the engine through the intake passage and injects fuel from the fuel injection valve into the air flowing through the intake passage, the fuel injection device is divided into a chamber portion and an intake control pipe portion, The chamber portion has a bottom, and has a bottomed cylindrical chamber recess that opens toward the intake control pipe mounting flange above the bottom, and one end opens at the side wall of the chamber recess, and the other end is at the engine side. The intake flange is provided with a plurality of intake passages, and the intake control pipe is provided with an intake control passage having one end open to the flange on the chamber side and the other end open to the atmosphere. By joining the flange on the chamber side of the intake control pipe to the flange on the control pipe, the opening of the chamber recess is closed by the flange on the chamber side of the intake control pipe to form the air chamber. The intake control passage of the control pipe is opened to the air chamber, and the throttle valve attached to the shaft is arranged in the intake control passage of the intake control pipe, and the fuel injection valve is arranged toward each intake passage. It is achieved by doing.

[0008]

The fuel injection device is formed by being divided into the chamber portion and the intake control pipe portion, the chamber concave portion of the chamber portion is formed by casting upward, and the intake passage is formed by casting laterally. Since it does not have a cut part and does not have an undercut part in the intake control passage of the intake control pipe part, it can be molded by die casting or injection molding, and its assembly is the installation of the intake control pipe in the chamber part. Since it is sufficient to simply join the flange of the intake control pipe section on the chamber section side to the flange, it can be manufactured at low cost. Moreover, since the shaft to which the throttle valve can be attached is arranged in the intake control pipe portion directly joined to the air chamber portion, the shaft can effectively obtain 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. FIG. 1 is a vertical sectional view thereof,
FIG. 2 is a cross-sectional view taken along line XX of FIG. Reference numeral 1 is a chamber portion, which is formed by the following. 2 is the bottom 3
The side wall 4 extends upward, and an opening 2A is formed at the upper end of the side wall 4.
Is a bottomed cylindrical chamber recess having a bottom, and a flat intake control pipe mounting flange 5 is provided on the outer peripheral portion of the opening.
Are formed toward the side. A plurality of intake passages 6 are opened in the side wall 4 of the chamber recess 2. The intake passages 6 extend to the right and open to a flat engine-side mounting flange 7 formed at the right end. That is, one end of the intake passage 6 opens to the side wall 4 of the chamber recess 2 and the other end opens to the mounting flange 7 on the engine side. In this embodiment, four intake passages 6 are provided in the vertical direction, but the number and arrangement of the intake passages 6 are appropriately designed according to the engine in which they are installed. Further, the shape of the intake passage 6 is also designed appropriately. In this embodiment, the mounting flange 7 on the engine side is used.
The shape of the intake passage toward the side has been enlarged.

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

Reference numeral 8 is an intake control pipe section having the following structure. Reference numeral 9 denotes a flat flange on the chamber portion side formed at the lower end in the drawing, and an intake control passage 10 opens in the flange 9 on the chamber portion side. That is,
The intake control passage 10 has a lower end opening to the chamber-side flange 9 and an upper part opening to the atmosphere.

When the intake control pipe portion 8 is molded 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 control passage 10 is shown in the figure. It is performed by a movable core that moves in the vertical direction. This is done because there is no undercut portion for the movable, fixed, mold and movable core based on the structure of the intake control pipe section 8 described above. By the above, the chamber part 1 and the intake control pipe part 8 were prepared specially.

The chamber portion 1 and the intake control pipe portion 8
And are assembled as follows. The flange 9 on the chamber portion side of the intake control pipe portion 8 is arranged on the intake control pipe mounting flange 5 of the chamber portion 1, and in such a state, the both flanges 5 and 9 are joined and integrated. This joining may be performed by any joining method such as screwing with a screw, bonding with an adhesive, a clip made of an elastic metal material, fitting with a hole and a locking projection. According to the above, the opening 2A of the chamber portion 1 has the intake control pipe mounting flange 5 of the intake control pipe portion 8.
The chamber recess 2 is formed as an air chamber 11 having a closed shape. On the other hand, the lower part of the intake control passage 10 of the intake control pipe part 8 opens to the air chamber chamber 11, and the upper part opens to the atmosphere.

The shaft 82 and the throttle valve 83 are arranged in the intake control passage 10 of the intake control pipe portion 8, and the fuel injection valve J is arranged in each intake passage 6. The shaft 82, the throttle valve 8
3. The fuel injection valve J may be assembled either when the intake control pipe section 8 and the chamber section 1 are individually provided or after they are assembled.

According to the fuel injection device assembled as described above, the air flowing in the intake control passage 10 is supplied with the throttle valve 83.
The amount of the air is controlled by the inflow into the air chamber chamber 11 and the air in the air chamber chamber 11 flows into each intake passage 6
The fuel injected by the fuel injection valve J is diverted and supplied to the engine, while the controlled fuel is injected and supplied toward the air flowing in each intake passage 6, thereby satisfying the operation of the engine. Let

[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 control pipe part do not have an undercut part when manufacturing a die and a core used in 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 part and the intake control pipe part can be joined simply by stacking the flanges facing each other and joining them together, and further, the joining can be carried out extremely easily by using a joining method which is generally used. Furthermore, since the intake control pipe mounting flange of the chamber part and the flange of the intake control pipe part on the chamber side can be joined once, the assembly cost can be reduced, which is accompanied by the reduction of the manufacturing cost. Thus, the fuel injection device can be provided at low cost. The shaft is directly arranged in the intake control pipe portion directly arranged in the chamber portion without any connecting pipe, so that the shaft can be arranged in the vicinity of the air chamber chamber. According to this, when the fuel injected from the fuel injection valve returns to the air chamber chamber due to the intake inertia, the shaft is efficiently lubricated by the fuel, and the rotatability of the shaft is maintained for a long period of time. Can be maintained stable. 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 vertical sectional view of a conventional fuel injection device.

[Explanation of symbols]

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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F02M 35/10 301 R 69/00 350 F 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. It is provided with a plurality of intake passages connected to the engine, and the air flowing in the intake control passage is controlled by a throttle valve to be supplied into the air chamber chamber, and the air in the air chamber chamber is supplied to the engine through the plurality of intake passages. In the fuel injection device for supplying and injecting fuel from the fuel injection valve into the air flowing through the intake passage, the fuel injection device is divided into the chamber portion 1 and the intake control pipe portion 8, and the chamber portion 1 includes A bottomed cylindrical chamber recess 2 having a bottom 3 and opening toward an intake control pipe mounting flange 5 above the bottom 3 and one end of a side wall 4 of the chamber recess 2 with the other end on the engine side. Mounting hula A plurality of intake passages 6 that open to the inlet 7, and the intake control pipe portion 8 is provided with an intake control passage 10 that has one end opening to the flange 9 on the chamber side and the other end opening to the atmosphere, By joining the flange 9 on the chamber side of the intake control pipe 8 onto the flange 5 on the intake control pipe of the chamber 1, the opening 2A of the chamber recess 1 is connected to the flange 9 on the chamber side of the intake control pipe 8. Are closed to form the air chamber chamber 11, the intake control passage 10 of the intake control pipe portion 8 is opened to the air chamber chamber 11, and the intake control passage portion 10 of the intake control pipe portion 8 is attached to the shaft 82. The fuel injection device is characterized in that the throttle valve 83 is arranged and the fuel injection valve J is arranged toward each intake passage 6.