JPH0216060Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a fuel injection valve mounting device, and in particular, a fuel injection valve mounting device that improves the ease of mounting the fuel injection valve and downsizes the intake system of an engine. Regarding equipment.

[Conventional technology]

In a fuel injection type internal combustion engine, fuel sent from a fuel pump is finally atomized by a fuel injection valve and injected into a combustion chamber or an intake passage. Therefore, the fuel injection valve has the function of maximizing the performance of the fuel pump, improving the mixing of the injected fuel and air, and maximizing engine performance including exhaust gas purification. It is.

[Problem that the invention attempts to solve]

Incidentally, as shown in FIG. 2, the fuel injection valve is mounted on the outer periphery of a linear intake manifold 4, in which a surge tank 6 is integrally formed. At this time, the fuel injection valve 8 is tilted at a predetermined angle so that the tip 8
a to the cylinder head 2 side, and
A support part 14 that opens into the intake passage 12 and has a fuel passage 18 inside is attached to the rear end 8b, and this support part 14 is fixed to the outer periphery of the intake manifold 4 with a fitting 20 such as a bolt. Ta.

As a result, fuel pumped from a fuel pump (not shown) is guided to the fuel injection valve 8 through the fuel passage 18, and the fuel is injected into the intake passage 12 by the fuel injection valve 8.

However, when installing the fuel injector, space is limited due to protruding parts such as surge tanks, which reduces installation ease, increases the size of the intake system, and reduces the flexibility of fuel system piping. It has the disadvantage of being small.

[Purpose of invention]

Therefore, in order to eliminate the above-mentioned inconvenience, the purpose of this invention is to provide first and second connectors having connecting surfaces located in the same plane and formed on both sides by a single processing step.
By curving the intake manifold to retain the fuel injector by the intake manifold,
It is an object of the present invention to provide a fuel injector mounting device that can improve the ease of mounting a fuel injector, downsize the intake system of an engine, and increase the degree of freedom in piping of the fuel system.

[Means for solving problems]

In order to achieve this object, this invention forms an intake manifold in a fuel-injected internal combustion engine by dividing the intake manifold into upper and lower parts by at least two parts, a first intake manifold and a second intake manifold.
The connecting surfaces of the intake manifold and the second intake manifold and the mounting surface of the fuel injection valve are located in the same plane, and both surfaces are formed by a single processing step, and the fuel injection is performed by the first intake manifold wall. The intake manifold is curved so that the valve tip side is also held by the second intake manifold wall at the rear end side of the fuel injection valve.

[Effect]

With the configuration as described above, the first intake manifold having a curved shape is attached to the cylinder head,
The first intake manifold wall holds the front end of the fuel injector, and the second intake manifold wall holds the rear end of the fuel injector, making it easier to install the fuel injector and downsizing the intake system, especially the intake manifold. I do.

〔Example〕

Embodiments of this invention will be described in detail below based on the drawings.

FIG. 1 shows an embodiment of this invention.
In FIG. 1, 2 is a cylinder head, 4 is an intake manifold, 6 is a surge tank, and 8 is a fuel injection valve. For example, the intake manifold 4 is divided into upper and lower parts to form first and second intake manifolds 4-1 and 4-2.
At the same time, the first and second intake manifolds 4-1 and 4-2 are respectively curved. Then, a fuel injection hole 1 is formed in the first intake manifold wall 4-1a on the side of the center of curvature of the first intake manifold 4-1.
0, and this hole 10 is formed so as to be oriented toward the intake passage 12 on the cylinder head 2 side. Further, the surge tank 6 is integrally formed in the second intake manifold 4-2, and the fuel injection valve 8 is mounted on the second intake manifold wall 4-2a on the side of the center of curvature of the second intake manifold 4-2. A support portion 14 is formed to support from the end 8b. This support part 14
A support recess 16 is formed in the support recess 1.
A fuel passage 18 communicating with the fuel passage 6 is formed. At this time, as shown in FIG.
supports the connecting surface F1 of the first intake manifold 4-1, the connecting surface F2 of the second intake manifold 4-2, and the rear end 8b of the fuel injection valve 8, for example, in a plane F perpendicular to the center line C of the Mounting surface 1 of support part 14
Both surfaces are formed by a single processing step so that the connecting surface F1 and the mounting surface 14F are located on the same plane.

When installing the intake manifold 4, first,
One end of the first intake manifold 4-1 is attached to the cylinder head 2. And the first intake manifold 4
When connecting one end of the second intake manifold 4-2 to the other end of the fuel injector 8, the tip 8a of the fuel injector 8 is inserted into the hole 10, and the rear end 8b is inserted into the support recess 16. Make the connection. And, first,
The first and second intake manifolds 4-1 and 4-2 are fastened together using a fixture 20 such as a bolt on the side opposite to the center of curvature of the second intake manifolds 4-1 and 4-2. At this time, the first,
Fasten the second intake manifolds 4-1 and 4-2.

Thereby, as shown in FIG. 1, the distance A from the center of the cylinder head 2 to the surge tank 6 can be made small while ensuring the length of the intake pipe. The intake system can be downsized.

Furthermore, the fuel injection valve can be quickly, reliably, and easily installed, and the ease of installation can be improved.

Further, the degree of freedom in forming the outlet of the fuel passage is high, and the degree of freedom in piping to the fuel pressure regulator, starting fuel injection valve, etc. of the fuel system can also be increased.

Furthermore, the number of processing steps can be reduced by forming both surfaces in a single processing step so that the connection surfaces of the first and second intake manifolds and the mounting surface of the fuel injection valve are located in the same plane. It is possible and has practical advantages.

It should be noted that this invention is not limited to the above-mentioned embodiments, and can be modified in various ways.

For example, in the embodiment of this invention, the first,
Although both of the second intake manifolds are curved, it is also possible to have one of the first or second intake manifolds straight.

[Effects of the invention] As explained in detail above, according to this invention, the fuel injection valve is held by the first and second intake manifolds, which have connecting surfaces formed by a single processing process on both sides so as to be located in the same plane. Since the intake manifold is preferably curved, it is possible to improve the ease of attaching the fuel injection valve, and it is also possible to downsize the intake system of the engine. Furthermore, the degree of freedom in piping of the fuel system can be increased, which is advantageous in practice. Furthermore, the number of man-hours required for machining the connecting surface of the first and second intake manifolds and the mounting surface of the fuel injection valve can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an intake system showing an embodiment of this invention. FIG. 2 is a schematic sectional view of an intake system showing the prior art of this invention. In the figure, 2
is the cylinder head, 4 is the intake manifold, 6 is the surge tank, 8 is the fuel injection valve, 10 is the hole, 12
1 is an intake passage, 14 is a support portion, 16 is a support recess, 1
8 is a fuel passage, and 20 is a fitting.

Claims (1)

[Scope of utility model registration request] In a fuel injection internal combustion engine, the intake manifold is formed into upper and lower parts by at least two first intake manifolds and a second intake manifold. The mounting surface and the mounting surface are located in the same plane, and both surfaces are formed by a single processing step, and the first intake manifold wall forms the front end of the fuel injector, and the second intake manifold wall forms the rear end of the fuel injector. A fuel injection valve mounting device characterized in that the intake manifold is formed in a curved manner so as to hold the intake manifold.