JPH0450458Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a fuel-injected internal combustion engine, and more particularly, to the internal combustion engine in which arrangement means for the fuel injection valve, intake pipe, common chamber, etc. are improved. be.

[Prior art]

In a fuel-injected internal combustion engine, which has a fuel injection valve for each cylinder, the fuel injection valve is attached to the cylinder head, the intake port, or the intake pipe near the port, and the fuel injection valve and the fuel injection valve are connected to the fuel injection valve. The fuel manifold etc. that supply the fuel are exposed and installed. Therefore, if fuel leaks from the connection point between the fuel injection valve and the fuel manifold, there is a risk that the fuel will catch fire and cause a fire in the vehicle.

For this reason, precise finishing and fixing means using screws are used as a means of attaching the fuel injector, but this method has disadvantages such as the device being complicated and large, making it difficult to fit around the narrow cylinder head. At present, it is difficult to take sufficient measures to prevent fuel leakage when connecting these.

On the other hand, the invention disclosed in Japanese Patent Application Laid-Open No. 1983-7990, which uses an intake manifold and an injector as a unit, proposes a method of attaching the injector to the injector mounting hole of the manifold through an elastic sheet and fixing it with an elastic member. .

However, even with this method, in the case of internal combustion engines with severe vibrations, the fixed parts tend to loosen and the sealing is insufficient, and there is still a need for improvement.

Now, FIG. 6 shows an outline of the arrangement of commonly used fuel injection valves and manifolds. That is, an intake pipe 3 is attached to the intake port 2 of the cylinder head 1, and a fuel injection valve 4 is attached near the attachment point of the intake pipe 3 so as to inject fuel toward the intake port 2. It is being
A fuel manifold 5 and a conductor 6 for driving a solenoid valve are attached to the fuel injection valve 4. In a multi-point injection internal combustion engine in which a fuel injection valve 4 is installed in each cylinder as shown in this figure, the intake pipe 3 is usually piped from a common chamber 7 to each cylinder as shown in the figure in order to improve intake efficiency. ing.

However, in the narrow engine compartment, it is difficult to provide a common chamber 7 with sufficient capacity due to the presence of components such as the intake pipe 3 and fuel injection valve 4, and the presence of the intake common chamber makes it difficult to perform maintenance on the fuel injection valves, fuel piping, etc. located below it. Moreover, various areas that need improvement, such as measures to prevent fuel leaks, have been pointed out.

[Purpose of invention]

The present invention was developed to solve the above-mentioned problems, and it is easy to maintain and adjust fuel injection valves, electrical wiring, etc. while maintaining the high output of the engine due to the intake common chamber. The purpose of this invention is to provide a fuel-injected internal combustion engine that can protect fuel injection valves, electrical wiring, etc. from corrosion and impact.

[Structure of the idea]

To achieve the above object, the fuel injection type internal combustion engine of the present invention includes a fuel injection valve for injecting fuel into the intake pipe, which is disposed in the intake common chamber, and
A conducting wire is disposed within the intake common chamber, and the conducting wire is connected to the fuel injection valve via an insertion portion attached to one end thereof, and is connected to the intake common chamber via an insertion portion attached to the other end thereof. It is characterized by being connected to a connector fixed to the wall. Hereinafter, the present invention will be specifically explained by showing examples.

〔Example〕

FIG. 1 shows a cylinder head 1 of a gasoline internal combustion engine provided with an intake common chamber 7 according to this embodiment.
FIG. FIG. 2 is an exploded perspective view showing the arrangement of each member with the lid of the intake common chamber 7 removed.

The common chamber 7 has a main body 7a and a seal packing 9 which can be detachably attached using a mounting bolt 8.
It is a box body consisting of a lid 7b attached through the main body 7a, and an intake pipe 3 for each cylinder provided in the main body 7a.
The main body 7a and the main body 7a are arranged such that the upstream side opens upward near the inner upper end of the main body 7a, and the main body 7a extends downstream along the inner wall of the main body 7a, crosses the bottom, and opens to the outside of the wall of the main body 7a. It is integrated.

Further, within the common chamber 7, a fuel injection valve 4 connected to the fuel manifold 5 is installed near the downstream opening of each intake pipe 3, and a fuel injection valve 4 connected to the fuel manifold 5 is installed near the downstream opening of each intake pipe 3. A pipe 13 and a conducting wire 6 are attached to pass through the main body 7a.

By attaching the main body 7a to the cylinder head 1 with bolts 12, the intake pipe 3 is connected to the intake port 2.

Further, a conduit 10 connected to a strainer, turbocharger, etc. (not shown) is attached to the common chamber 7 on the main body 7a,
A throttle valve 11 is provided near the opening.

In order for the fuel pipe 13 to penetrate the main body 7a,
As shown in the sectional view in FIG. 3, a conventional method is used in which the fuel pipe 13 is fixed by a female threaded portion 14 and a male threaded portion 15 attached to the main body 7a.

In addition, in order for the conducting wire 6 to pass through the main body 7a, as shown in the cross-sectional and perspective views in FIGS. It is configured.
In addition, in the figure, 17 is a conductor for continuity, and 20 is an insertion part for each fuel injection valve 4.

In the above embodiment, the intake pipe 3 is manufactured integrally with the main body 7a of the common chamber 7, but by manufacturing it separately and forming an assembly, the shape of each member can be simplified and manufacturing costs can be reduced.

Now, in the present invention, the fuel pipe 13, the fuel injection valve 4, and the fuel manifold 5 are installed inside the common chamber 7 as described above. Therefore, even if fuel happens to leak from the fuel manifold 5, the fuel injection valve 4, the joints thereof, etc., the leaked fuel remains within the common chamber 7 and does not leak directly to the outside. Therefore, there is no need to worry about contact with the high temperature engine body, etc., and
The leaked fuel comes into contact with the intake air in the common chamber 7 and evaporates successively, and is not supplied to the engine and accumulated, so that unexpected accidents can be prevented.

Furthermore, all of the evaporated fuel is sucked into the cylinder and combusted, resulting in a change in the air-fuel ratio. Therefore, since an abnormality can be detected by, for example, the ₀₂ sensor for the fuel flow control device, the driver or maintenance person can easily know what needs to be repaired.

Further, according to the present invention, by incorporating the space around the cylinder head into the common chamber 7, the capacity of the common chamber 7 can be increased without difficulty, contributing to an improvement in the output of the engine. Moreover, by arranging the common chamber 7 in the upper part of the engine room, it is possible to improve the workability of maintenance and adjustment of each of the above-mentioned members.

When implementing the present invention, various effects such as improved productivity and maintenance workability can be achieved by incorporating, for example, an idle speed control valve, a fuel pressure regulating regulator valve, etc. into the intake common chamber.

Although the internal combustion engine used in the above embodiments uses gasoline as fuel, the present invention can be advantageously applied to other internal combustion engines that use alcohol as fuel, for example.

[Effect of idea]

As described above, the present invention includes a fuel injection valve that injects fuel into an intake pipe, which is disposed in an intake common chamber, a conductor which is disposed within the intake common chamber, and which is attached to one end of the fuel injection valve. Connected to the fuel injection valve via an insertion part, and
Since it is connected to the connector fixed to the wall of the intake common chamber through the plug attached to the other end, maintenance and adjustment of fuel injection valves, electrical wiring, etc. is very easy while maintaining the high output of the engine from the intake common chamber. becomes easier.

Furthermore, the intake common chamber can protect the fuel injection valves, electrical wiring, etc. arranged therein from corrosion due to salt damage, and can also protect the fuel injection valves, electrical wiring, etc. from impact in the unlikely event of a collision or other incident.

Furthermore, since the intake common chamber also functions as a sound insulating wall, it is possible to reduce fuel injection noise from the fuel injection valve.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of an embodiment of the present invention, Fig. 2 is an exploded perspective view showing how the intake common chamber of Fig. 1 is assembled, and Fig. 3 is the connection part of the fuel piping. Explanatory diagram showing a cross section, 4th
FIG. 5 is a perspective view of a conductor portion, and FIG. 6 is an explanatory view showing the arrangement of a conventional fuel injection valve and an intake common chamber. 2...Intake port, 3...Intake pipe, 4...Fuel injection valve, 5...Fuel manifold, 6...Conductor, 7
...Intake common chamber, 7a...Main body, 7b...
…lid.

Claims (1)

[Scope of utility model registration request] A fuel injection valve that injects fuel into an intake pipe is disposed in an intake common chamber, and a conductor is disposed in the intake common chamber, and the conductor is connected to the fuel injection valve through an insertion portion attached to one end of the conductor. A fuel injection type internal combustion engine, characterized in that the engine is connected to a connector fixed to a wall surface of the intake common chamber through an insertion portion attached to the other end.