JPH07167021A - Fuel injection system - Google Patents

Abstract

PURPOSE: To mount a fuel injection system completely in an intake manifold. CONSTITUTION: This system includes one or plural fuel injectors, a plurality of fuel pipes 12 for supplying fuel to the individual cylinders 20 of an internal combustion engine 22 from the fuel injectors, nozzles 14 mounted to the ends 16 of the plurality of fuel pipes, and mounting brackets 18 for mounting the nozzles thereto. Each mounting bracket includes a cylinder part 34 for mounting the nozzle 14 therein and a generally flat plate shaped part 32 designed to be retainable in air passages 26, 28 through which air is introduced into the individual cylinders 20 of the internal combustion engine 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection system for an internal combustion engine for an automobile, more specifically,
It relates to a fuel injection system of the type having one fuel injector or a plurality of fuel injectors centrally arranged at one location.

[0002]

2. Description of the Related Art A known fuel injection system is provided with a plurality of fuel injectors, and the fuel injectors are collectively arranged at one location inside an intake manifold of an internal combustion engine. There is. Each of the plurality of fuel injectors supplies fuel to a plurality of cylinders of an internal combustion engine through a plurality of flexible fuel pipes (one fuel pipe is provided for each cylinder). Distributing, the fuel tubes extending through respective openings formed in the intake manifold. Nozzles (with poppet valves installed in the nozzles) are attached to the ends of the fuel pipes, and the nozzles are provided with respective openings formed in the internal combustion engine through plastic brackets. It is fastened inside. The openings formed in the internal combustion engine are openings designed so that a fuel injector can be provided for each cylinder individually, and the plastic bracket has a shape that holds and seals the nozzle in the openings. And dimensions. In this configuration, fuel is distributed from the fuel injectors to each cylinder of the internal combustion engine. The number of fuel injectors provided in the fuel injection system depends on the required application, and in some cases, only one fuel injector may be provided.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved construction of the known construction outlined above.

[0004]

To achieve the above object, a fuel injection system according to the present invention includes one or a plurality of fuel injectors and fuel from the fuel injectors to respective cylinders of an internal combustion engine. A plurality of fuel pipes for supplying, a nozzle provided at the tip of each of the plurality of fuel pipes, and a mounting bracket for mounting each of the nozzles, each of the mounting brackets, There is provided a cylindrical portion for mounting each of the nozzles therein, and a substantially flat plate portion capable of being held in an air passage for introducing air into each cylinder of the internal combustion engine. It is characterized by

[0005]

Embodiments of the present invention will now be described in more detail with reference to the drawings. The fuel injection system according to the embodiment of the present invention shown in the drawings includes one fuel injector 1
0, a plurality of flexible fuel tubes 12, nozzles 14 provided at the respective tip ends 16 of the fuel tubes 12, and a mounting bracket 1 for mounting each of the nozzles 14.
8 and. The number of the fuel pipes 12 is set according to the number of the cylinders 20 of the internal combustion engine 22 equipped with this fuel injection system, that is, the number of the cylinders 20 is made equal. The nozzle 14 is preferably equipped with a poppet valve. Since the poppet valve itself is known to those skilled in the art, detailed description thereof will be omitted. The fuel injector 10 is preferably located in the intake manifold 24 of the internal combustion engine 22, which is also well known to those skilled in the art. The intake manifold 24 includes a plurality of air passages 26, and the air passages 26 introduce air into respective air passages 28 formed in the main body of the internal combustion engine 22. Air passage 28 in the body of the internal combustion engine 22
Each is equipped with a reciprocating intake valve 30, which is a valve that controls the flow rate of air flowing into each cylinder 20, as is well known.

In the present invention, each of the mounting brackets 18 is provided at the connection portion between the air passage 26 of the intake manifold 24 and the air passage 28 of the main body portion of the internal combustion engine 22 or in the vicinity of the connection portion. There is. Each of the mounting brackets 18 is preferably made of plastic. The mounting bracket 18 connects the intake manifold 24 to the internal combustion engine 2
A flat plate portion 32 having a substantially flat plate shape that can be held by being sandwiched between the main body portion of the internal combustion engine 22 and the intake manifold 24 when assembled to the main body portion 2 of the internal combustion engine 22, and an opening formed in the flat plate portion 32. A cylindrical portion 34 located in the portion 36 and a plurality of arm portions 38 connecting and fixing the cylindrical portion 34 to the flat plate portion 32 are provided. Air is allowed to flow from the air passage 26 to the air passage 28 through the opening 36. The cylindrical portion 34 is shaped and dimensioned so that each nozzle 14 can be mounted and retained therein.
In this embodiment, one end 52 of the cylindrical portion 34 (FIGS. 4 and 5)
Is provided with a plurality of protrusions 46. To mount the nozzle 14, the nozzle 14 is pushed through the hole 44 of the cylindrical portion 34 in the direction indicated by the arrow X in the figure. When the nozzle 14 reaches the one end 52 of the cylindrical portion 34, the plurality of protrusions 46 are expanded and the shoulder 50 of the nozzle 14 projects beyond the shoulder 48 of the hole 44. Then, the protrusion 46 returns to the shape when no force is applied by the elasticity of itself and holds the nozzle 14 at that position. However, as the means for holding the nozzle 14 in the cylindrical portion 34, it is possible to use means other than this.

Each of the mounting brackets 18 is preferably arranged such that the longitudinal axis A of the cylindrical portion 34 forms an angle that is not perpendicular to the extending plane P of the flat plate portion 32. With such a configuration, the fuel jet 40 injected by the nozzle 14 assembled in the cylindrical portion 34 is
The mounting bracket 18 can be formed so that it is jetted into place on the back surface 42 of the zero contacting the intake valve 30. The intake valve 30 vaporizes the injected fuel (because of the high temperature during the operation of the internal combustion engine 22), thereby assisting the operation of the internal combustion engine.

Each of the mounting brackets 18 may be formed with its flat plate portion 32 sufficiently large to function as a gasket between the main body portion of the internal combustion engine 22 and the intake manifold 24. In that case, the plurality of mounting brackets 18 may be connected to each other and integrally formed, so that the plurality of mounting brackets may be formed as one component.

As a modified embodiment of the embodiment described above, the mounting bracket 18 is arranged in the air passage 26 formed in the intake manifold 24 or in the air passage 28 formed in the main body of the internal combustion engine 22. You can
In doing so, it is conceivable to retain the mounting bracket 18 in engagement with a groove formed in the inner wall of those air passages 26 or 28. As a further modified embodiment, each of the mounting brackets is formed by directly connecting the cylindrical portion to the flat plate portion (without interposing the arm portion), and forming an opening for passing air through another portion of the flat plate portion. It is also possible to

[0010]

According to the present invention, the fuel injection system can be completely retained inside the intake manifold, and the fuel can be injected into the intake valve of the internal combustion engine and vaporized by contacting the intake valve. Moreover, there are a number of excellent advantages in that the mounting bracket can also serve as a gasket between the body of the internal combustion engine and the intake manifold.

[Brief description of drawings]

1 is used in a fuel injection system according to the present invention,
It is a perspective view showing one fuel injector, a plurality of fuel pipes, and a plurality of nozzles.

FIG. 2 is a partial sectional view showing a state in which the nozzle shown in FIG. 1 is attached.

FIG. 3 is a front view of the mounting bracket viewed from the direction of arrow 3 in FIG.

FIG. 4 is an enlarged cross-sectional view showing a cylindrical portion of a mounting bracket and a nozzle.

FIG. 5 is a plan view of one end of the cylindrical portion of the mounting bracket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fuel injector 12 Fuel pipe 14 Nozzle 16 Tip of fuel pipe 18 Mounting bracket 20 Cylinder 22 Internal combustion engine 26 Air passage 28 Air passage 32 Flat plate portion 34 Cylindrical portion

Claims (7)

[Claims] 1. A fuel injection system comprising: one or a plurality of fuel injectors (10); and a plurality of fuel injectors for supplying fuel to respective cylinders (20) of an internal combustion engine (22). Fuel pipes (12), nozzles (14) provided at the respective tips (16) of the plurality of fuel pipes, and a mounting bracket (18) for mounting each of these nozzles. Each of the mounting brackets is adapted to be retained within a cylindrical portion (34) for mounting each of the nozzles therein and an air passageway (26, 28) for introducing air into a respective cylinder of the internal combustion engine. And a substantially flat plate-shaped flat plate portion (32). 2. Each of the mounting brackets (18) has an opening (3) in which the cylindrical portion (34) is formed in the flat plate portion (32).
6. The fuel injection system according to claim 1, wherein the fuel injection system is located in 6) and is fixed to the flat plate portion via a plurality of arm portions (38). 3. Each of the mounting brackets (18) has a longitudinal axis (A) of the cylindrical portion (34) at an angle other than 90 ° with respect to an extending plane of the flat plate portion (32). The fuel injection system according to claim 1 or 2, characterized in that 4. The fuel injection system according to claim 1, wherein each of the mounting brackets (18) is made of plastic. 5. Each of the mounting brackets (18) has its flat plate portion (32) between the main body of the internal combustion engine (22) and the intake manifold (24) of the internal combustion engine (22). The fuel injection system according to claim 1, wherein the fuel injection system is formed to be large enough to function as a gasket. 6. The mounting brackets are formed as one part by integrally forming the flat plate portions (32) of the plurality of mounting brackets (18) by connecting them to each other. The fuel injection system described. 7. A mounting bracket (18) for use in a fuel injection system according to any one of claims 1 to 7, wherein the nozzle (14) of the fuel injection system is mountable therein, and a cylindrical portion (34). (22) A substantially flat plate-shaped flat plate portion (32) capable of being held in the air passages (26, 28) for introducing air into the cylinder (20). .