JPH0219571Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a fuel supply device for a fuel injection type engine.

(Prior art) As a conventional technology regarding this type of device, for example, as shown in Japanese Utility Model Application Publication No. 10467/1983,
A fuel injection type engine is provided with an air bleed for blowing out air against fuel injected from a fuel injection valve extending into an intake passage, and a collision plate facing the fuel injected from the fuel injection valve. In the fuel supply device, a cylindrical socket for mounting the fuel injection valve is provided, and the socket is provided with an air bleed outlet and the collision plate, so that the air blown by the air bleed generates agitated mist of fuel. At the same time, the fuel that cannot be atomized by the ejected air is scattered and atomized by the collision plate,
Some have been designed to further improve fuel atomization and mixing.

However, in order to attach the collision plate, it is necessary to provide a special cylindrical socket as described above, which increases the cost, and it is not possible to expect the benefit of heating the collision plate and further promoting fuel atomization. There was a problem.

(Purpose of the invention) The present invention was devised in view of the above-mentioned problems, and by integrally forming the collision plate with the metal gasket interposed at the joint surface between the intake manifold and the engine body, the collision plate can be replaced with the conventional collision plate. In addition to simplifying the structure, such as eliminating the need to install a special socket to provide a high-temperature engine, the high-temperature part of the metal gasket with a large heat-receiving area placed in the high-temperature part of the engine can be used as the collision plate, which reduces the high temperature of the collision plate. It is an object of the present invention to provide a fuel supply device for a fuel injection type engine that can further promote fuel atomization.

(Structure of the invention) In order to achieve the above-mentioned object, this invention provides a fuel injection valve in the intake passage of the engine and the intake passage near the joint surface with the engine body, and a metal injector on the joint surface. A fuel injection engine with a gasket interposed therein, wherein a metal collision plate is integrally formed with the metal gasket, and the collision plate is positioned on the injection side on the axis of the fuel injection valve. This is an intake device.

Therefore, since the collision plate is part of a metal gasket with a large heat-receiving area that is placed in the high-temperature part of the engine, it does not require a complicated structure unlike conventional collision plates, and it also prevents fuel from scattering and atomizing. This can be carried out at high temperatures, which further improves fuel atomization and mixing.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention, in which 1 is an intake passage of a fuel injection type engine, which is formed by an intake manifold 2 and an engine body (cylinder head) 3. ing.

Reference numeral 4 denotes a mounting port for the fuel injection valve 5, which is provided in a socket portion 7 projecting diagonally from a part of the mounting flange 6 of the intake manifold 2. In addition, the mounting port 4
A tip portion 8 having a nozzle port of the fuel injection valve 5 is fitted to the tip portion 8 through a seal S and an adapter 9.
A partition wall 11 having a conical inner surface and having a nozzle hole 10 is provided in front of the mounting port 4 , that is, at the bottom of the mounting port 4 , and forms an air chamber 12 around the tip 8 . Also, the partition wall 1
A fuel injection passage 13 is cut from the intake passage 1 to the intake passage 1.

On the other hand, a throttle valve (not shown) is interposed on the upstream side of the intake passage 1, and the throttle valve connects the upstream intake passage 1 to the assist air supply passage 1.
4 connects its starting end, follows the path indicated by arrow A, and its terminal end opens into the air chamber 12. In the middle of the assist air supply passage 14, on the joint surface of the intake manifold 2 and the engine body 3 forming the intake passage 1, that is, on the engine body 3 side, there is an enlarged chamber 15 recessed in a rectangular shape and having a sufficiently wide inner wall surface. They are connected as if intervening. Of course, these series of assist air supply passages 14 are kept airtight from the outside.

Reference numeral 16 denotes a gasket interposed between the mounting flange 6 of the intake manifold 2 and the engine body 3, and is formed from a metal such as copper or aluminum having high thermal conductivity. 17 is a collision plate, which is a part of the gasket 16, that is, a large oblong hole 1 for each intake passage 1.
8 are raised and integrally formed so as to have sloped surfaces at a predetermined angle, that is, sloped surfaces at an angle that faces the fuel injected from the nozzle of the fuel injection valve 5 in the installed state. In addition, each collision plate 17 is penetrated with a large number of small holes 19 and a large hole 24 located in the vicinity of the fuel injection passage 13 where stagnation is particularly likely to occur, in order to prevent stagnation of the collided fuel. There is. In addition, 20 is an intake valve, 21
2 is a combustion chamber, 22 is an engine cooling water passage, and 23 is a distribution pipe.

The assist air is introduced from the upstream side of the throttle valve at approximately atmospheric temperature, passes through an assist air supply passage 14 made of a pipe, etc., and enters an enlarged chamber 15, which is formed to have a sufficiently wide inner wall surface in the high-temperature part of the engine, in the middle of the passage. Once it enters and is sufficiently heated, it flows into the air chamber 12. Here, the assist air further promotes fuel atomization during injection due to its high temperature, and furthermore, the collision plate 17 more reliably scatters and atomizes the fuel that has been ejected from the air chamber 12 and has not yet been atomized.

At this time, since the collision plate 17 is integrally formed with the gasket 16 which has a large heat-receiving area, the temperature of the engine body 3 is increased to a sufficient temperature, and the fuel can be atomized more reliably.

(Effect of the invention) As described above, according to the invention, the collision plate 17 for scattering and atomizing the injected fuel is integrated with the metal gasket 16 which has a large heat receiving area and has high thermal conductivity and is provided in the high temperature part of the engine. Because it is molded, the collision plate 17 itself is heated to a high temperature to generate fuel mist, compared to a conventional collision plate that is attached to the fuel injection valve installation part with a special cylindrical gasket interposed. The structure can be further improved, and the structure can be simplified, which is advantageous in terms of cost.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with FIG. 1 being a sectional view of the main part, and FIG. 2 being a plan view of the gasket. 1...Intake passage, 2...Intake manifold, 3...
... Engine body, 5 ... Fuel injection valve, 14 ... Assist air supply passage, 16 ... Gasket, 17
...Collision plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A fuel injection valve is disposed in the intake passage of the engine and the intake passage near the joint surface with the engine body,
In the joint surface with a metal gasket interposed therebetween, a metal collision plate is integrally formed with the metal gasket, and the collision plate is positioned on the injection side on the axis of the fuel injection valve. It is characterized by
Intake system for fuel-injected engines.